AIR CONDITIONER FOR VEHICLE
[Technical Field] 5 The present invention relates to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle which has inside air intake ports formed on the side surface of a cylindrical intake duct and the side surface of a cylindrical intake door so as to partially inhale inside 10 air during an outside air inflow mode.
[Background Art]
An air conditioner for a vehicle is an apparatus for cooling or heating the interior of the vehicle by cooling or
15 heating through the process of introducing outdoor air into the interior of the vehicle or circulating indoor air of the vehicle. Such an air conditioner for a vehicle includes an evaporator for cooling the inside of an air-conditioning case; a heater core for heating the inside of the air-
20 conditioning case; and a mode converting door for selectively blowing the air cooled by the evaporator or heated by the heater core toward parts of the interior of the vehicle.
According to independent structures of a blower unit, an evaporator unit and a heater core unit, such an air
25 conditioner is classified into a three-piece type air conditioner in which the blower unit, the evaporator unit and the heater core unit are disposed independently, a semi-center type air conditioner in which the evaporator unit and the heater core unit are embedded in the air-conditioning
30 case and the blower unit is mounted separately, and a center-mounting type air conditioner in which the three units are all embedded in the air-conditioning case.

In order to increase effectiveness of the interior space of a vehicle, compact-sized and miniaturized air conditioners for vehicles are being demanded. In response to such demand, recently, development of a center-mounting type air 5 conditioner in which a blower unit, an evaporator unit and a heater core unit are integrated is being promoted. As an example, such a center-mounting type air conditioner for a vehicle is illustrated in FIGS. 1 and 2.
The center-mounting type air conditioner 1 illustrated 10 in FIGS. 1 and 2 includes: an air-conditioning case 10 in which a blower 20 is mounted at an inlet and a plurality of air outflow ports 12a to 12e formed at an outlet thereof; an evaporator 2 and a heater core 3 embedded in the air-conditioning case 10; one or more temperature-adjusting doors
15 14 for adjusting the degree of opening of a cold air passageway PI and a warm air passageway P2 inside the air-conditioning case 10; and a plurality of mode doors 13 for adjusting the degree of opening of the air outflow ports 12a to 12e.
20 Moreover, the blower 20 includes: a scroll case 21 disposed at the inlet of the air-conditioning case 10; a centrifugal fan 25 rotatably mounted inside the scroll case 21; an intake duct 30 which is mounted at one side of the scroll case 21 and has inside and outside air inflow ports 31
25 and 32, which are opened and closed by an intake door 33; an inlet ring 22 which is formed at one side of the scroll case 21 facing the intake duct 30 to guide the air induced through the inside and outside air inflow ports 31 and 32 toward the inside of the centrifugal fan 25; and a motor 27 mounted on
30 the opposite side of the inlet ring 22 of the scroll case 21 to operate the centrifugal fan 25.
2

The intake door 33 opens the inside air inflow port 31 in the inside air inflow mode so that only inside air flows in but opens the outside air inflow port 32 in the outside air inflow mode so that only outside air flows in. 5 Moreover, an air filter 35 for removing foreign matters contained in the air is mounted inside the intake duct 30.
In the meantime, the intake door 33 is configured as a flat type door, and in this instance, a rotary shaft of the intake door 33 is arranged to be at right angles to a rotary 10 shaft of the centrifugal fan 25.
Therefore, when the centrifugal fan 25 of the blower 20 is operated, low pressure is formed inside the centrifugal fan 25 by rotation of the centrifugal fan 25 so that air is inhaled in the axial direction of the centrifugal fan 25 15 through the inlet ring 22 and is blown in the radial direction of the centrifugal fan 25, and then, the blown air is discharged to the inside of the air-conditioning case 10 through an outlet 23 of the scroll case 21.
Continuously, the air discharged to the inside of the 20 air-conditioning case 10 is cooled while passing through the evaporator 2, and then, bypasses the heater core 3 by the temperature-adjusting door 14 to flow in a cold air state or passes the heater core 3 to be converted into warm air through heat-exchange. After that, the air is discharged to 25 the interior of the vehicle through the air outflow ports 12 opened according to the air-conditioning modes so as to cool or heat the interior of the vehicle.
However, the conventional blower 20 has a disadvantage
in that it requires lots of driving power to raise heating
30 performance when a heater is operated in cold weather, such
as winter season. That is, in cold weather such as winter
season, the air conditioner is generally set as the outside
3

air inflow mode not only to maintain the interior of the vehicle in a heated state but also to prevent frost on windows. Therefore, the conventional air conditioner requires lots of driving power to heat the interior of the 5 vehicle and is deteriorated in heating performance because only cold air outside the vehicle is introduced through the outside air inflow port 32.
In order to solve the above problems, as shown in FIG. 3, the intake door 33 has an inside air inflow structure to
10 raise heating performance by partially introducing inside air in the outside air inflow mode. Referring to FIG. 3, the intake door 33 includes an auxiliary inside air passageway 33a, a rotary shaft 33b and an auxiliary door 34 mounted on the rotary shaft 33b of the intake door 33 for opening and
15 closing the auxiliary inside air passageway 33a.
Therefore, the auxiliary door 34 closes the auxiliary inside air passageway 33a in the inside air inflow mode, and opens the auxiliary inside air passageway 33a by negative pressure generated by operation of the centrifugal fan 25 in
20 the outside air inflow mode. Therefore, when the heater is operated in the outside air inflow mode, outside air introduced through the outside air inflow port 32 and inside air introduced through the auxiliary inside air passageway 33a are mixed together, and then, the mixed air is introduced
25 into the air-conditioning case 10 so as to reduce driving power required for heating and raise heating performance.
However, the conventional air conditioner for the vehicle has a disadvantage in that manufacturing processes and manufacturing costs are increased due to an increase of
30 the number of components because it requires additional components, such as the auxiliary door 34 additionally
4

mounted on the intake door 33 to inhale inside air in the outside air inflow mode.
[Disclosure]
5 [Technical Problem]
Accordingly, the present invention has been made in an effort to solve the above-mentioned problems occurring in the prior arts, and it is an object of the present invention to provide an air conditioner for a vehicle which has inside air
10 intake ports formed on the side surface of a cylindrical intake duct and the side surface of a cylindrical intake door so as to partially inhale inside air during an outside air inflow mode, thereby reducing manufacturing processes and manufacturing costs because there is no need to add a
15 separate component for inhaling inside air in the outside air inflow mode, controlling intake amounts of outside air and inside air through a recess part formed on the outer circumferential surface of the intake door, and enhancing cooling and heating performance by partially inhaling inside
20 air during the outside air inflow mode,
[Technical Solution]
To achieve the above objects, the present invention provides an air conditioner for a vehicle including: a scroll 25 case which is disposed at an inlet of an air-conditioning case and has a centrifugal fan mounted therein; an intake duct which is combined to one side of the scroll case in an axial direction of the centrifugal fan and has inside and outside air inflow ports to introduce inside air and outside 30 air; and an intake door which is rotatably mounted inside the intake duct through a rotary shaft to open and close the inside and outside air inflow ports, wherein the intake duct
5

has an opening formed at one side to be combined to the scroll case and the inside and outside air inflow ports are formed in the outer circumferential surface of the intake duct to be spaced apart from each other in the 5 circumferential direction, the intake door has an opening formed in a cylindrical door part to open and close the inside and outside air inflow ports according to rotational angles, and in an outside air inflow mode where the outside air inflow port is opened by the intake door, inside air 10 intake holes are respectively formed in the side of the intake duct and the side of the intake door so that inside air existing outside the intake duct is inhaled into the intake door.
15 [Advantageous Effects!
As described above, the air conditioner for the vehicle according to the present invention can reduce manufacturing processes and manufacturing costs without needing any separate component for inhaling inside air in the outside air
20 inflow mode, because the inside air intake ports are formed on the side surface of the cylindrical intake duct and the side surface of the cylindrical intake door in order to partially take in inside air during the outside air inflow mode.
25 Moreover, the air conditioner for the vehicle according to the present invention can enhance cooling and heating performance by partially inhaling inside air during the outside air inflow mode.
Furthermore, the air conditioner for the vehicle
30 according to the present invention can control the intake amounts of outside air and inside and maximize cooling and
6

heating performance because the recess part is formed on the outer circumferential surface of the intake door.
Additionally, the air conditioner for the vehicle according to the present invention can prevent misassembly 5 between the intake door 150 and the intake duct 140 and improve assemblability by easily finding the correct position of the intake door because of the support rib for fixing and supporting the rotary shaft of the cylindrical intake door and the misassembly preventing means formed on the supporter,
10 which is formed on the inner circumferential surface of the intake duct to rotatably support the rotary shaft of the intake door.
In addition, the air conditioner for the vehicle according to the present invention can improve bearing
15 strength of the supporter by the shielding plate of the misassembly preventing means and prevent that the intake door is separated from the operational range by operating power or air volume of the actuator because the stud of the intake door is caught to the supporter within the operational range.
20
[Description of Drawings]
FIG. 1 is a perspective view showing a conventional air conditioner for a vehicle.
FIG. 2 is a sectional view of FIG. 1. 25 FIG. 3 is a perspective view showing a state where an inside air inflow structure is mounted on an intake door in the conventional air conditioner for the vehicle.
FIG. 4 is a perspective view of an air conditioner for a vehicle according to the present invention. 30 FIG. 5 is a side view of the air conditioner for the vehicle according to the present invention.
7

FIG. 6 is a perspective view of an intake duct of the air conditioner for the vehicle according to the present invention.
FIG. 7 is an exploded perspective view of the intake 5 duct and an intake door of the air conditioner for the vehicle according to the present invention.
FIG. 8 is a perspective view of the intake door of the air conditioner for the vehicle according to the present invention. 10 FIG. 9 is a side view seen from an opening of the intake duct of FIG. 7.
FIG. 10 is an exploded perspective view of the intake duct and the intake door on which misassembly preventing means is formed in the air conditioner for the vehicle 15 according to the present invention.
FIG. 11 is a perspective view of the intake door on which the misassembly preventing means is formed in the air conditioner for the vehicle according to the present invention. 20 FIG. 12 is a side view seen from the opening of the intake duct in FIG. 10.
FIG. 13 is a sectional view showing the air conditioner for the vehicle according to the present invention.
25 [Mode for Invention]
Hereinafter, reference will be now made in detail to the preferred embodiments of the present invention with reference to the attached drawings.
As shown in the drawing, an air conditioner 100 for a
30 vehicle according to a preferred embodiment of the present
invention includes: an air-conditioning case 110; a blower
130 disposed at an inlet 111 of the air-conditioning case
8

110; and an evaporator 101 and a heater core 102 mounted in an inside air passageway of the air-conditioning case 110.
The inlet 111 of the air-conditioning case 110 is connected with an outflow port 133 of the blower 130, and a 5 plurality of outlets 112 are formed to discharge air to parts of the interior of the vehicle.
The number or the positions of the outlets 112 are varied according to kinds of vehicles.
Moreover, mode doors 125 are respectively mounted at the 10 outlets 112 of the air-conditioning case 110 to adjust the degree of opening of the outlets 112 according to an air outflow mode.
Furthermore, the evaporator 101 and the heater core 102 are formed between the inlet 111 and the outlets 112 of the 15 air-conditioning case 110 to be spaced apart from each other at a predetermined interval.
Additionally, a temperature-adjusting door 120 is mounted between the evaporator 101 and the heater core 102 inside the air-conditioning case 110. 20 The temperature-adjusting door 120 adjusts the degrees of opening of a passageway bypassing the heater core 102 and a passageway passing the heater core 102 to control a mixed amount of cold air bypassing the heater core 102 and warm air passing the heater core 102 after passing through the 25 evaporator 101 in order to adjust temperature.
In the meantime, the temperature-ad jus ting door 120 and the mode door 125 are operated by operating means 160.
Now, as an example, the operating means 160 for
operating the mode door 125 will be described. The operating
30 means 160 includes: an arm 161 which is combined with a
rotary shaft of the mode door 125 and has a pin 161a at an
end portion; and a cam 162 rotatably combined to the outer
9

face of the air-conditioning case 110 and has a slot 162a for allowing the pin 161a of the arm 161 to be slidably combined. Therefore, when the cam 162 rotates at a predetermined angle, the arm 161 operates the mode door 125 while providing 5 a cam motion along the shape of the slot 162a.
The cam 162 is operated by an actuator (not shown) or a wire (not shown).
The operating means for operating the temperature-adjusting door 120 is the same as that of the mode door 125. 10 In addition, the blower 130 includes: a scroll case 131 connected and disposed at the inlet 111 of the air-conditioning case 110; a centrifugal fan 132 rotatably mounted inside the scroll case 131; an intake duct 140 which is combined to one side of the scroll case 131 in an axial 15 direction of the centrifugal fan 132 and has inside and outside air inflow ports 141 and 142 to introduce inside air and outside air; and an intake door 150 which is rotatably mounted inside the intake duct 140 to open and close the inside and outside air inflow ports 141 and 142. 20 Such a blower 130 is mounted above the evaporator 101 of the air-conditioning case 110, and the scroll case 131 is formed integrally with the air-conditioning case 110.
Additionally, the intake duct 140 is combined to one side of the scroll case 131 and a motor 132a for operating 25 the centrifugal fan 132 is combined to the other side of the scroll case 131.
Moreover, the intake duct 140 is formed in a cylindrical shape. One side of the cylindrical intake duct 140 in the axial direction is opened by a round opening 143, and the 30 other side 144 is closed. Of course, the closed side 144 of the intake duct 140 has an air intake hole 145 which will be described later.
10

Furthermore, the opening 143 of the intake duct 14 0 is combined to the scroll case 131.
Additionally, the inside and outside air inflow ports 141 and 142 are formed on the outer circumferential surface 5 of the intake duct 140 to be spaced apart from each other in the circumferential direction.
A pair of the inside air inflow ports 141 are formed on
the outer circumferential surface of the intake duct 140
corresponding to positions, of a pair of door plates 153a and
10 153b. Namely, two inside air inflow ports 141 are formed at
an interval of 180 degrees.
One outside air inflow port 142 is formed on the outer
circumferential surface of the intake duct 140, and in this
instance, the outside air inflow port 142 is formed between a
15 pair of the inside air inflow ports 141 on the outer
circumferential surface of the intake duct 140.
In other words, the two inside air inflow ports 141 are formed in the direction of 18 0 degrees in the middle of the intake duct 140 and the one outside air inflow port 142 is 20 formed in the direction of 90 degrees.
Therefore, when the centrifugal fan 132 of the blower 130 is operated, air is inhaled into the intake duct 140 through the inside and outside air inflow ports 141 and 142, and the inhaled air is discharged in the radial direction of 25 the centrifugal fan 132 .after being introduced into the centrifugal fan 132. After that, the air is supplied to the inlet 111 of the air-conditioning case 110 through the outflow port 133 of the blower 130.
In addition, a supporter 14 6 for rotatably supporting a 30 rotary shaft 151a of the intake door 150 is disposed on the inner circumferential surface of the opening 143 of the intake duct 140.
11

Accordingly, the rotary shaft 151a of the intake door 150 is rotatably combined to the supporter 146, and a rotary shaft 151b of the other side is rotatably combined to the closed side 144 of the intake duct 140. 5 The supporter 14 6 includes: a boss part 14 6a for rotatably supporting the rotary shaft 151a of the intake door 150; and a plurality of connection ribs 14 6b for connecting the outer circumferential surface of the boss part 146a with the inner circumferential surface of the opening 143 of the 10 intake duct 140.
Three plural connection ribs 146b are formed at an
interval of 120 degrees, and in this instance, the boss part
146a is arranged to be spaced apart from the opening 143 of
the intake duct 140 at a predetermined interval by the
15 connection rib 146b.
Moreover, the intake door 150 is rotatably mounted inside the intake duct 140 and the rotary shafts 151a and 151b of the intake door 150 are mounted to be in the same direction with the rotary shaft of the centrifugal fan 132 so 20 as to open and close the inside and outside air inflow ports 141 and 142.
The intake door 150 is a cylindrical door, and has an
opening 154 formed on the outer circumferential surface of
the cylindrical door part 153 to open and close the inside
25 and outside air inflow ports 141 and 142 according to
rotating angles.
In more detail, the intake door 150 includes: a pair of door plates 153a and 153b. which are spaced apart from each other at a predetermined interval in the radial direction 30 based on the rotary shafts 151a and 151b thereof to form the cylindrical door part 153; a support rib 152 which connects inner faces of the door plates 153a and 153b with each other
12

and on which the rotary shaft 151a is formed; and a side plate 156 which connects end portions of the door plates 153a and 153b with each other and on which the other rotary shaft 151b is formed. 5 The support rib 152 formed on the inner circumferential surface of the cylindrical door part 153 fixes and supports the rotary shaft 151a of one side.
Each of the door plates 153a and 153b is formed in an arc shape. 10 Furthermore, the support rib 152 includes: a *V -shaped first rib 152a formed on the inner face of the door plates 153a and connected toward the rotary shaft 151a; and a *V-shaped second rib 152b formed on the inner face of the other door plate 153b and connected toward the rotary shaft 151a.
15 The rotary shaft 151a axially protrudes at the portion where the first rib 152a and the second rib 152b meet together.
Additionally, the intake door 150 has the opening 154 formed between the door plates 153a and 153b in the circumferential direction.
20 Meanwhile, one end portion of each of the door plates 153a and 153b is supported by the side plate 156 to be connected, and the other end portion is supported by a reinforcing bar 158 to be connected.
In this instance, the reinforcing bar 158 is formed at
25 the position spaced apart.from the other end portion of the door plate at a predetermined interval.
Therefore, in the outside air inflow mode, the door plates 153a and 153b close the inside air inflow port 141 and the opening 154 opens the outside air inflow port 142 to make
30 the outside air flow in. In an inside air inflow mode, one of the door plates 153a and 153b closes the outside air
13

inflow port 142 and the opening 154 opens the inside air inflow port 141 to make the inside air flow in.
As shown in FIG. 6, the intake duct 140 includes: an insertion groove 147 formed on the circumference of the 5 opening 143 thereof; and a support protrusion 153c formed on the other end portions of the door plates 153a and 153b and rotatably inserted into the insertion groove 147 to be supported.
That is, end portions' of the door plates 153a and 153b
10 are connected with each other by the side plate 156 to be closed, but the other end portions of the door plates 153a and 153b are not connected with each other and are opened for a flow of air. Therefore, in case that the door plates 153a and 153b close the inside air inflow port 141 or the outside
15 air inflow port 142, air may leak through the other end portions of the door plates 153a and 153b, but the support protrusion 153c formed on the other end portions of the door plates 153a and 153b is inserted into the insertion groove 14 7 formed on the circumference of the opening 14 3 of the
20 intake duct 140 to prevent air leakage.
In this instance, if the interval between the insertion groove 147 and the support protrusion 153c is reduced in order to prevent air leakage, operating power to operate the intake door 150 increases and it makes manipulation power bad.
25 On the contrary, if the interval between the insertion groove 147 and the support protrusion 153c is widened to reduce operating power of the intake door 150, excessive air leakage is generated to reduce heating and cooling performance.
Therefore, if the depth of the insertion groove 147 is
30 "a" and the length of the support protrusion 153c inserted into the insertion groove 147 is "b", a ratio of b/a satisfies 0.6 to 0.8.
14

If the width of the insertion groove 147 is "c" and the thickness of the support protrusion 153c inserted into the insertion groove 147 is "d", a ratio of d/c satisfies 0.65 to 0.75. 5 In this instance, it is preferable that the ratio of b/a be 0.72 and the ratio of d/c be 0.70.
As described above, if the depth and the width of the
insertion groove 147 and the length and the thickness of the
support protrusion 153c are optimized, degradation of heating
10 and cooling performance due to air leakage is minimized and
manipulation power for controlling the intake door 150 by a
controller becomes better, owing to a decrease of operating
power for operating the intake door 150, so that the intake
door 150 can be manipulated smoothly.
15 In addition, in the outside air inflow mode that the
outside air inflow port 142 is opened by the intake door 150,
inside air intake holes 145 and 157 are formed in the side
144 of the intake duct 14 0 and the side 156 of the intake
door 150 so that inside air existing outside the intake duct
20 140 can be inhaled into the intake door 150.
The inside air intake hole 157 of the intake door 150 is formed to penetrate through the intake door 150.
The inside air intake hole 145 of the intake duct 140 is formed to penetrate through the side 14 4 of the intake duct 25 140 facing the side plate 156 of the intake door 150.
In this instance, two inside air intake holes 145 of the intake duct 140 are formed at 180 degrees based on the rotary shaft 151b of the intake door 150, and preferably, are formed corresponding to a pair of the inside air inflow ports 141. 30 In the meantime, the inside air intake holes 157 formed on the side plate 156 of the intake door 150 may be
15

respectively formed in both side plates 156 based on the rotary shaft 151b or may be formed just in one side plate 156 Therefore, in the outside air inflow mode, because the opening 154 of the intake door 150 opens the outside air 5 inflow port 142 and the door plates 153a and 153b close the inside air inflow port 141, the side plate 156 which connects the door plates 153a and 153b with each other is located at the position where the inside air intake hole 145 of the intake duct 140 is closed. In this instance, while the
10 inside air intake hole 157 formed in the side plate 156 and the inside air intake hole 145 formed in the side 144 of the intake duct 140 coincide with each other, the inside air intake holes 14 5 and 157 are opened, so that the inside air of a predetermined amount is inhaled through the inside air
15 intake holes 145 and 157 even in the outside air inflow mode.
Meanwhile, in the outside air inflow mode, the inside
air intake hole 157 formed in the side plate 156 and the
inside air intake hole 145 formed in the side 14 4 of the
intake duct 140 are opened while coinciding with each other,
20 and in the inside air inflow mode, the inside air intake hole 145 is opened while the side plate 156 of the intake door 150 deviates from the inside air intake hole 145 of the intake duct 140.
Moreover, a recess part 155 is formed on the cylindrical
25 door part 153 of the intake door 150 to be inwardly sunken at the outer circumferential surface of one end portion of the cylindrical door part 153 where the inside air intake hole 157 in order to control an intake amount of inside air inhaled into the inside air intake hole 157.
30 The recess part 155 is formed in such a way that the outer circumferential surface of the cylindrical door part 153 is sunken flatways, namely, in such a way that the outer
16

circumferential surfaces of the door plates 153a and 153b of the cylindrical door part 153 are respectively sunken stepwise in the inward direction.
In this instance, the recess part 155 is not formed in 5 the whole axial length section of the cylindrical door part 153 but is formed just from the end portion of the cylindrical door part 153 to a certain section.
As described above, because the stepwise recess part 155 is formed on the cylindrical door part 153, the air
10 conditioner for the vehicle according to the present invention can adjust the intake amounts of the outside air inhaled to the outside air inflow port 142 and the inside air inhaled to the inside air intake ports 145 and 157 in the outside air inflow mode.
15 In other words, because opening areas of the inside air intake port 157 of the intake door 150 and the inside air intake port 145 of the intake duct 140 can be adjusted by the stepwise recess part 155, the air conditioner for the vehicle according to the present invention can adjust the intake
20 amount of the inside air inhaled through the inside air intake ports 145 and 157, and finally, can adjust the intake amount of outside air through the outside air inflow port 142 and the intake amount of the inside air through the inside air intake ports 145 and 157 in the outside air inflow mode.
25 As an example, in the outside air inflow mode, the intake amount of outside air may be 70% and the intake amount of inside air may be 30%.
As described above, because there is no need to add components to inhale the inside air in the outside air inflow
30 mode, the air conditioner for the vehicle according to the present invention can reduce manufacturing processes and manufacturing costs and enhance cooling and heating
17

performance by inhaling some of the inside air in the outside air inflow mode.
In the meantime, preferably, the inside air intake port 157 of the intake door 150 is formed to be smaller than the 5 inside air intake port 145 of the intake duct 140.
Furthermore, the intake door 150 is operated through operating means 170.
The operating means 170 includes: an arm 172 which is rotatably combined to the side of the intake duct 140 and has 10 a pin (not shown) disposed at one end portion; and a cam 171 which is combined to a rotary shaft 151b of the intake door 150 and has a slot 171a for allowing the pin of the arm 172 to be combined slidably.
The operating means 170 actuates the arm 172 to operate 15 the cam 171. That is, when the arm 172 rotates at a predetermined angle, the cam 171 is also rotated at a predetermined angle while the pin of the arm 172 moves along the slot 171a of the cam 171 so as to operate the intake door 150. 20 Meanwhile, the arm 172 may be operated by a wire (not shown) or an actuator .(not shown) , but is preferably, operated by the wire in this structure.
FIG. 10 is an exploded perspective view of the intake duct and the intake door on which misassembly preventing 25 means is formed in the air conditioner for the vehicle according to the present invention, FIG. 11 is a perspective view of the intake door on which the misassembly preventing means is formed in the air conditioner for the vehicle according to the present invention, and FIG. 12 is a side 30 view seen from the opening of the intake duct in FIG. 10. Between the supporter 14 6 of the intake duct 14 0 and the support rib 152 of the intake door 150, misassembly
18

preventing means 180 is formed to prevent misassembly between the intake door 150 and the intake duct 140.
The misassembly preventing means 180 includes: a stud 182 which protrudes on the support rib 152 in the axial 5 direction and is arranged to be inserted into one area (A) of a plurality of areas (A, B and C) divided by a plurality of connection ribs 14 6b; and a shielding plate 181 which is formed to connect the connection ribs 146b in the remaining areas (B and C) where the stud 182 is not inserted to prevent 10 that the stud 182 is inserted into the remaining areas (B and C) .
In other words, the stud 182 is inserted into one area (A) of the three areas (A, B and CO divided by the three connection ribs 146b and the shielding plate 181 is formed in 15 the two remaining areas (B and C).
The area (A) where the stud 182 is inserted is an operation range of the intake door 150.
In the meantime, the shielding plate 181 is formed to connect the connection ribs 146b in the areas (B and CO where 20 the stud 182 is not inserted, but is also connected to the outer circumferential surface of the boss part 146a.
Additionally, the stud 182 is formed on one of the first and second ribs 152a and 152b of the support rib 152. In the drawings, the stud 182 is formed on the second rib 152b. 25 In this instance, a reinforcing rib 183 for forming the stud 182 is formed inside the second rib 152b of a "V" form, and the stud 182 is formed on the side of the reinforcing rib 18 3 to protrude to a predetermined length in the axial direction. 30 Therefore, when the intake door 150 is rotated at a predetermined angle in order to open or close the inside and
19

outside air inflow ports 141 and 142, the stud 182 is rotated within one area (A).
In this instance, when the intake door 150 opens the inside air inflow port 141, the stud 182 is caught to the 5 connection ribs 146b located at one side of the area (A), but when the intake door 150 opens the outside air inflow port 142, the stud 182 is caught to the connection ribs 146b located at the other side of the area (A).
Therefore, because the stud 182 of the intake door 150
10 is caught to the connection ribs 14 6b of the supporter 146 within the operation range, the intake door 150 is prevented from being separated from the operation range by operating power or air volume of the actuator (not shown).
In other words, the stud 182 can improve the function to
15 prevent the intake door 150 from being separated from the operation range.
In addition, when the intake door 150 is assembled inside the intake duct 140, because the stud 182 can be inserted into only one area (A) of the three areas (A, B and
20 C) and cannot be inserted into the remaining areas (B and C) by the shielding plate 181, it prevents misassembly between the intake door 150 and the intake duct 140 and improve assemblability since the correct position of the intake door 150 can be found easily.
25 Moreover, preferably, a distance from the rotational center of the intake door 150 to the center of the stud 182 is shorter than a distance from the rotational center of the intake door 150 to the edge of the shielding plate 181. Therefore, the stud 182 is caught to the shielding plate 181
30 in the areas (B and CO where the shielding plate 181 is formed, and so, the stud 182 is not inserted into the areas (B and C).
20

Furthermore, preferably, the distance from the rotational center of the intake door 150 to the center of the stud 182 is shorter than half of the radius of the cylindrical door part 153. 5 That is, because the stud 182 is formed near to the boss part 146a of the supporter 146, it can improve bearing strength of the connection ribs 14 6b of the supporter 14 6 more than a case that the stud 182 is formed far from the boss part 146a. 10 In other words, when the intake door 150 is operated, the stud 182 comes into contact with the connection ribs 146b, and in this instance, a predetermined power is applied to the stud 182, which gets in contact with the connection ribs 146b, by operating power of the actuator or air volume. In this 15 instance, when the stud 182 is formed near to the boss part 14 6a, bearing strength of the connection ribs 146b against pushing power of the stud 182 can be increased.
Additionally, the bearing power of the connection rib 14 6 can be also improved by the shielding plate 181 which 20 connects a plurality of the connection ribs 146b.
As described above, when the intake door 150 is assembled, the structure of the stud 182 and the shielding plate 181 can prevent that the stud 182 is not assembled to the correct position, where the shielding plate is not formed, 25 but is assembled to another position, where the shielding plate is formed, can prevent separation of the intake door 150, and can enhance bearing strength of the connection ribs 146b.
Hereinafter, actions of the air conditioner for the
30 vehicle according to the present invention will be described.
First, when the centrifugal fan 132 is operated by
operation of the motor 132a, low pressure is formed inside
21

the centrifugal fan 132 by the rotation of the centrifugal fan 132, so that inside air or outside air is inhaled into the intake duct 140 through the inside air inflow port 141 or the outside air inflow port 142 opened by the intake door 150 5 The inhaled air passes the inside of the intake door 150, flows to the inside of the centrifugal fan 132, and then, is blown in the radial direction of the centrifugal fan 132.
Here, in the inside air inflow mode, the intake door 150 closes the outside air inflow port 142 but opens the inside 10 air inflow port 141 and opens the inside air intake hole 145 of the intake duct 140, so that just the inside air flows in through the inside air inflow port 141 and the inside air intake hole 145.
In the outside air inflow mode, the intake door 150 15 closes the inside air inflow port 141 but opens the outside air inflow port 142, and the inside air intake hole 145 of the intake duct 140 and the inside air intake hole 157 of the intake door 150 are also opened, so that outside air is induced through the outside air inflow port 142 and the 20 inside air is also induced through the inside air intake holes 14 5 and 157. In this instance, the outside air is inhaled at the rate of about 70% and the inside air is inhaled at the rate of about 30%.
Continuously, the air blown in the radial direction of 25 the centrifugal fan 132 is blown to the inside of the air-conditioning case 110 while moving along the inside of the scroll case 131.
The air blown to the inside of the air-conditioning case
110 is selectively cooled while passing the evaporator 101
30 according to heating or cooling modes, and then, flows in a
cold air state by bypassing the heater core 102 by the
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temperature-adjusting door 120 or flows in a warm air state while passing through the heater core 102.
The air changed into warm air or cold air is discharged to the interior of the vehicle through the outlet 112 opened 5 through the mode door 125 so as to cool or heat the interior of the vehicle.
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[CLAIMS]
[Claim l]
An air conditioner for a vehicle which includes: a scroll case {131) which is disposed at an inlet (111) of an 5 air-conditioning case (110) and has a centrifugal fan (132) mounted therein; an intake duct (140) which is combined to one side of the scroll case (131) in an axial direction of the centrifugal fan (132) and has inside and outside air inflow ports (141, 142) to introduce inside air and outside 10 air; and an intake door (150) which is rotatably mounted inside the intake duct (14 0) through a rotary shaft to open and close the inside and outside air inflow ports (141, 142), wherein the intake duct (140) has an opening (143) formed at one side to be combined to the scroll case (131) 15 and the inside and outside air inflow ports (141, 142) are formed in the outer circumferential surface of the intake duct (140) to be spaced apart from each other in the circumferential direction,
wherein the intake door (150) has an opening (154) 20 formed in a cylindrical door part (153) to open and close the inside and outside air inflow ports {141, 142) according to rotational angles, and
wherein in an outside air inflow mode where the outside
air inflow port (142) is opened by the intake door {150) ,
25 inside air intake holes {145, 157) are respectively formed in
the side of the intake duct (140) and the side of the intake
door (150) so that inside air existing outside the intake
duct (140) is inhaled into the intake door {150).
[Claim 2]
30 The air conditioner according to claim 1, wherein a
recess part (155) is formed on the cylindrical door part
(153) to be inwardly sunken at the outer circumferential
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surface of the cylindrical door part (153) in order to
control intake amounts of inside air and outside air in the
outside air inflow mode.
[Claim 3]
5 The air conditioner according to claim 2, wherein the
inside air intake hole (157) of the intake door (150) is
smaller than the inside air intake port (14 5) of the intake
duct (140).
[Claim 4]
10 The air conditioner according to claim 2, wherein the
recess part (155) is formed in such a way that the outer
circumferential surface of the cylindrical door part 153 is
sunken flatways.
[Claim 5]
15 The air conditioner according to claim 1, wherein a
supporter (14 6) for rotatably supporting a rotary shaft
(151a) of the intake door (150) is disposed on the inner
circumferential surface of the intake duct (140), and
wherein the rotary shaft (151a) of the intake door (150)
20 is rotatably combined to the supporter (14 6), and a rotary
shaft (151b) of the other side is rotatably combined to the
side (144) of the intake duct (140).
[Claim 6]
The air conditioner according to claim 5, wherein the
25 intake door (150) comprises:
a pair of door plates (153a, 153b) which are spaced
apart from each other at a predetermined interval in the
radial direction based on the rotary shafts (151a, 151b)
thereof to form the cylindrical door part (153); a support
30 rib (152) which connects inner faces of the door plates (153a,
153b) with each other and on which the rotary shaft (151a) is
formed; and a side plate (156) which connects end portions of
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the door plates {153a, 153b) with each other and on which the other rotary shaft {151b) is formed. [Claim 7]
The air conditioner according to claim 6, wherein the 5 inside air intake hole (157) of the intake door {150) is formed in the side plate . (156) to penetrate the side plate (156), and
wherein the inside air intake hole (145) of the intake duct (140) is formed in the side (144) of the intake duct 10 (14 0) opposed to the side plate (156) of the intake door (150) to penetrate the side (144) of the intake duct (140). [Claim 8]
The air conditioner according to claim 6, wherein the intake duct (140) comprises: 15 an insertion groove (147) formed on the circumference of the opening (143) thereof;' and
a support protrusion (153c) formed on the other end portions of the door plates (153a, 153b) to be rotatably supported and inserted into the insertion groove (147). 20 [Claim 9]
The air conditioner according to claim 8, wherein if the depth of the insertion groove (147) is "a" and the length of the support protrusion {153c) inserted into the insertion groove (147) is "b", a ratio of b/a satisfies 0.6 to 0.8. 25 [Claim 10]
The air conditioner according to claim 8, wherein if the width of the insertion groove (147) is "c" and the thickness of the support protrusion (153c) inserted into the insertion groove {147) is "d", a ratio of d/c satisfies 0.65 to 0.75. 30 [Claim 11]
The air conditioner according to claim 6, wherein a pair
of the inside air inflow ports (141) of the intake duct (140)
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are formed corresponding to the positions of a pair of the door plates (153a, 153b), and the single outside air inflow port (142) is formed between the inside air inflow ports (141) . 5 [Claim 12]
The air conditioner according to claim 5, wherein the
intake door (150) is mounted such that the rotary shafts
(151a, 151b) of the intake door (150) are arranged in the
same direction as the rotary shaft of the centrifugal fan
10 (132).
[Claim 13]
The air conditioner according to claim 5, wherein a support rib (152) is formed on the inner circumferential surface of the cylindrical door part (153) to fix and support 15 the rotary shaft (151a), and
wherein misassembly preventing means (180) is formed on the supporter (146) and the support rib (152) in order to prevent misassembly between the intake door (150) and the intake duct (140). 20 [Claim 14]
The air conditioner according to claim 13, wherein the supporter (146) comprises: a boss part (146a) for rotatably supporting the rotary shaft (151a) the intake door (150); and a plurality of connection ribs (146b) for connecting the boss 25 part (146a) with the inner circumferential surface of the intake duct (140). [Claim 15]
The air conditioner according to claim 14, wherein the misassembly preventing means (180) comprises: 30 a stud (182) which protrudes on the support rib (152) in the axial direction and is arranged to be inserted into one
area (A) of a plurality of areas (A, B, C) divided by a
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plurality of connection ribs (146b); and
a shielding plate (181) which is formed to connect the connection ribs (14 6b) in the remaining areas (B, C) where the stud (182) is not inserted to prevent that the stud (182) 5 is inserted into the remaining areas (B, C). [Claim 16]
The air conditioner according to claim 15, wherein the plural connection ribs (146b) are formed at an interval of 120 degrees, and 10 wherein the stud (182) is arranged to be inserted into one area (A) of the three areas (A, B, C) divided by the three connection ribs (14 6b), and the shielding plate (181) is formed in the two remaining areas (B, C). [Claim 17] 15 The air conditioner according to claim 15, wherein a distance from the rotational center of the intake door (150) to the center of the stud (182) is shorter than a distance from the rotational center of the intake door (150) to the edge of the shielding plate (181). 20 [Claim 18]
The air conditioner according to claim 17, wherein the distance from the rotational center of the intake door (150) to the center of the stud (182) is shorter than half of the radius of the cylindrical door part (153). 25
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