DESC:FIELD OF THE INVENTION
The present invention generally relates to a system for an air-conditioner scroll design and particularly to a system and method for an air-conditioner scroll design for maximum airflow and noise reduction.
BACKGROUND
Global warming causes an increase in the temperature of the earth. Therefore, summer is getting hotter, and winters are getting less cold. Because of the hotter summer, the demand for air conditioners has increased. Producing and using electricity more efficiently reduces both the amount of fuel needed to generate electricity and the amount of greenhouse gases and other air pollution emitted as a result. Air-conditioners consume a large amount of electricity, which will directly impact on the environment & electricity bills are also very high. To tackle this situation, we require more energy-efficient products. Thus, there is a need for the present invention to solve the problem of more energy-efficient products.
TW201812225A discloses the object of the present invention is to provide an air conditioner that can still stably supply air even under the operation condition that the dust accumulates in the occasion of the air filter or the heater exchanger to make the ventilation resistance of the airway become large. The means to solve the problem is the air conditioner (100) in which the indoor unit (2) is provided with the crossflow fan (9) constituted by axially connecting a plurality of fan components and a front nasal part (28) configured to be along the axial direction of the crossflow fan (9). The opposite surfaces (28Aa-28Ca) opposite to the crossflow fan (9) of the front nasal part (28) are located at two end sides of the crossflow fan (9) and have the protruded part (28Ce) whose length of the circumferential direction of the crossflow fan (9) is longer than that of the central side of the cross flow fan (9). The area width (W) of the protruded part of the axial direction of the crossflow fan (9) is the occasion of forming the diameter (D) of the crossflow fan (9). Wherein, the 0.08 = W/D = 0.32 is satisfied.
The existing invention does not provide maximum airflow and less operating noise therefore, there is a need for an improved system to provide an air-conditioner scroll design that can provide maximum airflow and less operating noise.

OBJECTIVE OF THE INVENTION
The main objective of the present invention is to design & develop an air conditioner that provides comfort to a human being with maximum airflow.
Another objective of the present invention is to design & develop an air conditioner that provides comfort to human beings with less operating noise of Air conditioner.
Yet another objective of the present invention is to design & develop air conditioners that provide comfort to human beings with more energy-efficient products.
Yet another objective of the present invention is to provide more cooling with less consumption of electricity.
Yet another objective of the present invention is to provide a system that cut down the cost of operation of cooling by reducing energy consumption.
Further objectives, advantages, and features of the present invention will become apparent from the detailed description provided herein below, in which various embodiments of the disclosed invention are illustrated by way of example.
SUMMARY OF THE INVENTION
The present invention relates to an air-conditioner scroll design system for maximum airflow and noise reduction. The system of the present invention includes a crossflow fan, a chassis scroll, a side wall one, a side wall two, and the blow-out path. Herein, the crossflow fan includes a fan rotor. The fan rotor includes a plurality of blades and rotates about the center of the axis. Herein, the chassis scroll is a housing for the fan rotor. Herein, the chassis scroll includes a suction port, a blowout port, a tongue portion, a first extension wall, a scroll wall portion, and a second extension wall. Herein, the suction port is used for sucking air with help of the crossflow fan. Herein, the blowout port is used for blowing the air out and housing the fan rotor. Herein, the tongue portion is close to an outer periphery of the fan rotor and extends in axial direction of the fan rotor. The tongue portion has grooves on inner body. Herein, the first extension wall continuously extends from the tongue portion to a blowout port. The first extension wall has a first extension wall midpoint. Herein, the scroll wall portion is a wall portion formed in a spiral shape except for a one-end portion thereof and elongated in the axial direction of the fan rotor above the centre of axis of the fan rotor to cover the outer peripheral surface of the fan rotor. Herein, on one end of the scroll wall portion the suction port is present to approach the fan rotor as the scroll wall portion extends from the upstream side to the downstream side. The scroll wall portion is formed to be away from the fan rotor as the scroll wall portion extends toward the downstream side towards the blowout port. Herein, the second extension wall is formed to be smoothly continuous with the scroll wall portion to a position directly above the upper end portion of the tongue portion, the second extension wall is facing the first wall portion. Herein, the side wall one and the side wall two are respectively provided on the axial ends of the fan rotor to define a blow-out path between the first extension wall and the second extension wall. The side wall one and the side wall two are formed such that the blow-out path has an expanded portion whose cross-sectional area increases as the cross-sectional shape of the expanded portion changes from a rectangular shape to an isosceles shape from a downward side toward an upstream side thereof. Herein, the isosceles shape has a portion near the second extension wall larger in width than the portion near the first extension wall. When the blown air that has flowed into the blow-out path passes through the expanded portion, the flow is gradually expanded, thus due to increase in discharge area, cubic feet per minute [CFM] increases. Herein, the grooves provided in the tongue portion acts as a guide for the air and the air flow pattern is streamlined, because of this streamlined airflow, the twisting of the air flow does not happen that does not cause the whirl and turbulence, and the turbulence in the airflow is reduced that causes reduction in the air pressure losses thus increasing the efficiency of the air performance thus preventing back flow. Herein, when the blown air that has flowed into the blow-out path passes through the expanded portion, the flow of the blown air near the second extension wall is gradually expanded, with the expanded discharge area air flow friction with the side wall one and the side wall two reduces, that results in noise reduction. Herein, the grooves provided in the tongue portion reduce the turbulence that is a major cause of intermittent noise thus reducing the intermittent noise of the system. Herein, to reduce the backflow, the blowout port is increased that acts as a suction for the airflow, and airflow is streamlined. Herein, the distance between the tongue portion at the end of first extension wall and the second extension wall is A 1. The distance between the first extension wall and the second extension wall on different positions are A2, A3, and A4, thus, the first extension wall and the second extension wall are formed to satisfy the expression A4>A3>A2>A1. In this way, the expanded portion has the cross-sectional shape changing from a rectangular shape to an isosceles shape from the downstream side to the upstream side. The distance between the first extension wall and the second extension wall gradually increases, thus, the cross-sectional area of the blow-out path gradually increases. As a result, when the blown air that has flowed into the blow-out path passes through the expanded portion, the flow is gradually expanded. The blown air flows to every part of the blow-out path even on the downstream side. In an embodiment, the present invention has, a front panel, a crossflow fan, a heat exchanger, a drain pan, an air inlet port, and a PCB Cover box completing the front grille assembly. In an embodiment, the front grille assembly is formed as a box body having a substantially rectangular shape and a thin body, whose length is more than its width & height. The front grille assembly has an air inflow port on one side thereof in the horizontal direction and a blowout port on the other side. In an embodiment, the crossflow fan has a fan rotor and a housing, the crossflow fan is elongated in the longitudinal direction. In an embodiment, the heat exchanger has four heat exchange sections, the four heat exchange sections are elongated in the longitudinal direction and are arranged in different angles to surround the suction side of the crossflow fan. In an embodiment, the fan rotor includes eleven disc-shaped partition plates, the plurality of blades and two shafts, the eleven disc-shaped partition plates are spaced apart from one another, and the plurality of blades are provided on outer peripheral portions of each pair of the eleven disc-shaped partition plates facing each other to extend between the pair of the partition plates, the plurality of blades are circumferentially spaced apart from one another. In an embodiment, the side wall one and the side wall two have an inclined surface that is inclined inwardly to provide the blow-out path with an expanded portion.

The main advantage of the present invention is that the present invention provides comfort to a human being with maximum air flow.
Another advantage of the present invention is that the present provides comfort to a human being with less operating noise air conditioner.
Yet another advantage of the present invention is that the present invention provides comfort to a human being with more energy-efficient products.
Yet another advantage of the present invention is that the present invention provides more cooling with less consumption of electricity.
Yet another advantage of the present invention is that the present invention cuts down the cost of operation of cooling by reducing energy consumption.
Further objectives, advantages, and features of the present invention will become apparent from the detailed description provided herein below, in which various embodiments of the disclosed invention are illustrated by way of example.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings are incorporated in and constitute a part of this specification to provide a further understanding of the invention. The drawings illustrate one embodiment of the invention and together with the description, serve to explain the principles of the invention.
Fig.1. illustrates the cross-sectional view of air-conditioner scroll design system.
Fig.2. illustrates an exploded front view of air-conditioner scroll design system.
Fig.3. illustrates the isometric view of chassis scroll.
DETAILED DESCRIPTION OF THE INVENTION
Definition
The terms “a” or “an”, as used herein, are defined as one or as more than one. The term “plurality”, as used herein, is defined as two as or more than two. The term “another”, as used herein, is defined as at least a second or more. The terms “including” and/or “having”, as used herein, are defined as comprising (i.e., open language). The term “coupled”, as used herein, is defined as connected, although not necessarily directly, and not necessarily mechanically.
The term “comprising” is not intended to limit inventions to only claiming the present invention with such comprising language. Any invention using the term comprising could be separated into one or more claims using “consisting” or “consisting of” claim language and is so intended. The term “comprising” is used interchangeably used by the terms “having” or “containing”.
Reference throughout this document to “one embodiment”, “certain embodiments”, “an embodiment”, “another embodiment”, and “yet another embodiment” or similar terms means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of such phrases or in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics are combined in any suitable manner in one or more embodiments without limitation.
The term “or” as used herein is to be interpreted as an inclusive or meaning any one or any combination. Therefore, “A, B or C” means any of the following: “A; B; C; A and B; A and C; B and C; A, B and C”. An exception to this definition will occur only when a combination of elements, functions, steps, or acts are in some way inherently mutually exclusive.
As used herein, the term "one or more" generally refers to, but not limited to, singular as well as the plural form of the term.
The drawings featured in the figures are to illustrate certain convenient embodiments of the present invention and are not to be considered as a limitation to that. Term "means" preceding a present participle of operation indicates the desired function for which there is one or more embodiments, i.e., one or more methods, devices, or apparatuses for achieving the desired function and that one skilled in the art could select from these or their equivalent in view of the disclosure herein and use of the term "means" is not intended to be limiting.
disclosure herein and use of the term "means" is not intended to be limiting.
Fig.1. illustrates the cross-sectional view of air-conditioner scroll design system(100). The system(100) includes a crossflow fan(114), a chassis scroll(108), a side wall one(122), a blow-out path(128). The crossflow fan(114) includes a fan rotor(102). The fan rotor(102) includes eleven disc-shaped partition plates(152), a plurality of blades(104), and rotates about a center of axis(106). The chassis scroll(108) is a housing for the fan rotor(102). The chassis scroll(108) includes a suction port(110), a blowout port(112), a tongue portion(116), a first extension wall(118), a scroll wall portion(126), an air inlet port(144), a side wall one(122), and a second extension wall(120). The system(100) has, a front panel(156), a heat exchanger(136), and an air inlet port(144) completing the front grille assembly(142). The blowout port(112) is used for blowing the air out, and housing the fan rotor(102). The tongue portion(116) is close to the outer periphery of the fan rotor(102) and extends in the axial direction of the fan rotor(102). The first extension wall(118) continuously extends from the tongue portion(116) to a blowout port(112). The distance between the tongue portion(116) at the end of first extension wall(118) and the second extension wall(120) is A1, the distance between the first extension wall(118) and the second extension wall(120) on different positions are A2, A3, A4, thus, the first extension wall(118) and the second extension wall(120) are formed to satisfy the expression A4>A3>A2>A1, in this way, the expanded portion(130) has the cross-sectional shape changing from a rectangular shape to an isosceles shape from the downstream side to the upstream side, and the distance between the first extension wall(118) and the second extension wall(120) gradually increases, thus, the cross-sectional area of the blow-out path(128) gradually increases.
Fig.2. illustrates an exploded front view of air-conditioner scroll design system. The side wall one(122) and the side wall two(124) are formed such that the blow-out path(128) has an expanded portion(130) whose cross-sectional area increases. The second extension wall(120) is facing the first wall portion(118).
Fig.3. illustrates the isometric view of the chassis scroll. The crossflow fan(114) and the tongue portion(116) are shown. The tongue portion(116) has grooves(132) on the inner body. A drain pan(138) is provided for draining purposes.
The present invention relates to an air-conditioner scroll design system for maximum airflow and noise reduction. The system of the present invention includes a crossflow fan, a chassis scroll, a side wall one, a side wall two, and the blow-out path. Herein, the crossflow fan includes a fan rotor. The fan rotor includes a plurality of blades and rotates about a centre of axis. Herein, the chassis scroll is a housing for the fan rotor. Herein, the chassis scroll includes a suction port, a blowout port, a tongue portion, a first extension wall, a scroll wall portion, and a second extension wall. Herein, the suction port is used for sucking air with the help of the crossflow fan. Herein, the blowout port is used for blowing the air out and housing the fan rotor. Herein, the tongue portion is close to the outer periphery of the fan rotor and extends in an axial direction of the fan rotor. The tongue portion has grooves on the inner body. Herein, the first extension wall continuously extends from the tongue portion to a blowout port. The first extension wall has a first extension wall midpoint. Herein, the scroll wall portion is a wall portion formed in a spiral shape except for a one-end portion thereof and elongated in the axial direction of the fan rotor above the centre of axis of the fan rotor to cover the outer peripheral surface of the fan rotor. Herein, on one end of the scroll wall portion the suction port is present to approach the fan rotor as the scroll wall portion extends from the upstream side to the downstream side. The scroll wall portion is formed to be away from the fan rotor as the scroll wall portion extends toward the downstream side towards the blowout port. Herein, the second extension wall is formed to be smoothly continuous with the scroll wall portion to a position directly above the upper end portion of the tongue portion, the second extension wall is facing the first wall portion. Herein, the side wall one and the side wall two are respectively provided on axial ends of the fan rotor to define a blow-out path between the first extension wall and the second extension wall. The side wall one and the side wall two are formed such that the blow-out path has an expanded portion whose cross-sectional area increases as cross-sectional shape of the expanded portion changes from a rectangular shape to an isosceles shape from a downward side toward an upstream side thereof. Herein, the isosceles shape has a portion near the second extension wall larger in width than the portion near the first extension wall. When the blown air that has flowed into the blow-out path passes through the expanded portion, the flow is gradually expanded, thus due to increase in discharge area, cubic feet per minute [CFM] increases. Herein, the grooves provided in the tongue portion acts as a guide for the air and the air flow pattern is streamlined, because of this streamlined airflow, the twisting of the air flow does not happen that does not cause the whirl and turbulence, the turbulence in the airflow is reduced that causes reduction in the air pressure losses thus increasing the efficiency of the air performance thus preventing back flow. Herein, when the blown air that has flowed into the blow-out path passes through the expanded portion, the flow of the blown air near the second extension wall is gradually expanded, with the expanded discharge area air flow friction with the side wall one and the side wall two reduces, that results in noise reduction. Herein, the grooves provided in the tongue portion, reduces the turbulence that is a major cause of intermittent noise thus reducing the intermittent noise of the system. Herein, in order to reduce the backflow, the blowout port is increased that acts as a suction for the airflow, and airflow is streamlined. Herein, the distance between the tongue portion at the end of first extension wall and the second extension wall is A1. The distance between the first extension wall and the second extension wall on different positions are A2, A3, and A4, thus, the first extension wall and the second extension wall are formed to satisfy the expression A4>A3>A2>A1. In this way, the expanded portion has the cross-sectional shape changing from a rectangular shape to an isosceles shape from the downstream side to the upstream side. The distance between the first extension wall and the second extension wall gradually increases, thus, the cross-sectional area of the blow-out path gradually increases. As a result, when the blown air that has flowed into the blow-out path passes through the expanded portion, the flow is gradually expanded. The blown air flows to every part of the blow-out path even on the downstream side. In an embodiment, the present invention has, a front panel, a crossflow fan, a heat exchanger, a drain pan, an air inlet port and a PCB Cover box completing the front grille assembly. In an embodiment, the front grille assembly is formed as a box body having a substantially rectangular shape and a thin body, whose length is more than its width & height. The front grille assembly has an air inflow port on one side thereof in the horizontal direction and a blowout port on the other side. In an embodiment, the crossflow fan has a fan rotor, and a housing, the crossflow fan is elongated in the longitudinal direction. In an embodiment, the heat exchanger has four heat exchange sections, the four heat exchange sections are elongated in the longitudinal direction and are arranged in different angles to surround the suction side of the crossflow fan. In an embodiment, the fan rotor includes an eleven disc-shaped partition plates, plurality of blades and two shafts, the eleven disc-shaped partition plates are spaced apart from one another, plurality of blades are provided on outer peripheral portions of each pair of the eleven disc-shaped partition plates facing each other to extend between the pair of the partition plates, the plurality of blades are circumferentially spaced apart from one another. In an embodiment, the side wall one and the side wall two have an inclined surface that is inclined inwardly to provide the blow-out path with an expanded portion.
In an embodiment, the present invention relates a method for air-conditioner scroll design system, the method comprising:
an air flow directed from the air inlet port to the blowout port is formed in the front grille assembly when the fan rotor is activated,
this causes the air in the indoor space to flow into the chassis scroll through the suction area,
the air that has flowed into the front grille assembly through the air inlet port, the heat exchange with the refrigerant when passing through the heat exchanger and has air temperature changed accordingly,
after temperature change, air is sucked thorough the rotor fan, flows through an air flow path formed in the chassis scroll, and is blown out of the blowout port,
the air blown out of the rotor fan is supplied into the indoor space through the blowout port, this air adjusts the temperature of the air in the indoor space,
the blow-out path is provided with the expanded portion whose cross-sectional shape changes from a rectangular shape to an isosceles shape having a portion near the second extension wall that is higher in width than the tongue portion near the first extension wall,
the inclined surfaces of the side wall one and the side wall two allows the portion of the expanded portion near the second extension wall,
the expanded portion of the blow-out path is configured such that the distance between the first extension wall and the second extension wall increases from the upstream side to the downstream side of the expanded portion, so that the cross-sectional area of the path is increased,
when the blown air that has flowed into the blow-out path passes through the expanded portion, the flow is expanded, and there is increase in discharge surface area of blown air in the downstream portion of the blow-out path near the second extension wall is increase,
the blown air flows to every part of the blow-out path even on the down­ stream side, and is blown out of the blowout port,
this avoids the blown air from being separated from the second extension wall during the high load,
operation, and blocks the air from reversely flowing from the end portions of the blowout port.
,CLAIMS:I/WE CLAIM
1. An Air-conditioner scroll design system(100) for maximum airflow and noise reduction, the system(100) comprising:
A crossflow fan(114), the crossflow fan(114) having
a fan rotor(102), the fan rotor(102) includes a plurality of blades(104), the fan rotor(102) rotates about a centre of axis(106);
a chassis scroll(108), the chassis scroll(108) is a housing for the fan rotor(102), the chassis scroll(108) having
a suction port(110), the suction port(110) is used for sucking air with help of the crossflow fan(114);
a blowout port(112), the blowout port(112) is used for blowing the air out, and housing the fan rotor(102);
a tongue portion(116), the tongue portion(116) is close to an outer periphery of the fan rotor(102) and extends in axial direction of the fan rotor(102), the tongue portion(116) has grooves(132) on inner body;
a first extension wall(118), the first extension wall(118) continuously extends from the tongue portion(116) to a blowout port(112), the first extension wall(118) has a first extension wall midpoint(134);
a scroll wall portion(126), the scroll wall portion(126) is a wall portion formed in a spiral shape except for a one-end portion thereof, and elongated in the axial direction of the fan rotor(102) above the centre of axis(106) of the fan rotor(102) to cover the outer peripheral surface of the fan rotor(102);
wherein, on one end of the scroll wall portion(126) the suction port(110) is present to approach the fan rotor(102) as the scroll wall portion(126) extends from the upstream side to the downstream side, the scroll wall portion(126) is formed to be away from the fan rotor(102) as the scroll wall portion(126) extends toward the downstream side towards the blowout port(112);
a second extension wall(120), the second extension wall(120) is formed to be smoothly continuous with the scroll wall portion(126) to a position directly above the upper end portion of the tongue portion(116), the second extension wall(120) is facing the first wall portion(118);
a side wall one(122);
a side wall two(124); and
the blow-out path(128);
characterized in that, the side wall one(122) and the side wall two(124) are respectively provided on axial ends of the fan rotor(102) to define a blow-out path(128) between the first extension wall(118) and the second extension wall(120), and the side wall one(122) and the side wall two(124) are formed such that the blow-out path(128) has an expanded portion(130) whose cross-sectional area increases as cross-sectional shape of expanded portion(130) changes from a rectangular shape to a isosceles shape from an downward side toward a upstream side thereof,
characterized in that, the isosceles shape has a portion near the second extension wall(120) larger in width than the portion near the first extension wall(118), therefore when the blown air that has flowed into the blow-out path(128) passes through the expanded portion(130), the flow is gradually expanded, thus due to increase in discharge area, cubic feet per minute[CFM] increases,
characterized in that, the grooves(132) provided in the tongue portion(116) acts as a guide for the air and the air flow pattern is streamlined, because of this streamlined airflow, the twisting of the air flow does not happen that does not causes the whirl and turbulence, the turbulence in the airflow is reduced that causes reduction in the air pressure losses thus increasing the efficiency of the air performance thus preventing back flow,
characterized in that, when the blown air that has flowed into the blow-out path(128) passes through the expanded portion(130), the flow of the blown air near the second extension wall(120) is gradually expanded, with the expanded discharge area air flow friction with the side wall one(122) and the side wall two(124) reduces that results in noise reduction,
characterized in that, the grooves(132) provided in the tongue portion(116), reduces the turbulence that is a major cause of intermittent noise thus reducing intermittent noise of the system,
characterized in that, in order to reduce the backflow the blowout port(112) is increased that acts as a suction for the air flow and air flow is streamlined,
wherein, the distance between the tongue portion(116) at the end of first extension wall(118) and the second extension wall(120) is A1, the distance between the first extension wall(118) and the second extension wall(120) on different positions are A1, A2, A3, A4, thus, the first extension wall(118) and the second extension wall(120) are formed to satisfy the expression A4>A3>A2>A1, in this way, the expanded portion(130) has the cross-sectional shape changing from a rectangular shape to an isosceles shape from the downstream side to the upstream side, and the distance between the first extension wall(118) and the second extension wall(120) gradually increases, thus, the cross-sectional area of the blow-out path(128) gradually increases, as a result, when the blown air that has flowed into the blow-out path(128) passes through the expanded portion (130), the flow is gradually expanded, and the blown air flows to every part of the blow-out path(128) even on the downstream side.
2. The system(100) as claimed in claim 1, wherein the system(100) has, a front panel(156), a crossflow fan(114), a heat exchanger(136), a drain pan(138), an air inlet port(144) and a PCB Cover box(140) completing the front grille assembly(142).
3. The system(100) as claimed in claim 1 and 2, wherein the front grille assembly(142) is formed as a box body having a substantially rectangular shape and a thin body, whose length is more than its width & height, the front grille assembly(142) has an air inflow port(144) on one side thereof in the horizontal direction and a blowout port(112) on the other side.
4. The system(100) as claimed in claim 1, wherein the crossflow fan(114) has a fan rotor(102), and a housing (148), the crossflow fan(114) is elongated in the longitudinal direction.
5. The system(100) as claimed in claim 1 and 2, wherein the heat exchanger(136) has four heat exchange sections, the four heat exchange sections are elongated in the longitudinal direction and are arranged in different angles to surround the suction side of the crossflow fan(114).
6. The system(100) as claimed in claim 1 and 4, wherein the fan rotor(102) includes an eleven disc-shaped partition plates(152), plurality of blades(104) and two shafts(154), the eleven disc-shaped partition plates(152) are spaced apart from one another, plurality of blades(104) are provided on outer peripheral portions of each pair of the eleven disc-shaped partition plates(152) facing each other to extend between the pair of the partition plates, the plurality of blades(104) are circumferentially spaced apart from one another.
7. The system(100) as claimed in claim 1, wherein the side wall one(122) and the side wall two(124) have an inclined surface that is inclined inwardly to provide the blow-out path(128) with an expanded portion(130).
8. The system as claimed 1 and 2, wherein, a method for an Air-conditioner scroll design system(100), the method comprising:
an air flow directed from the air inlet port(144) to the blowout port(112) is formed in the front grille assembly(142) when the fan rotor(102) is activated,
this causes the air in the indoor space to flow into the chassis scroll(108) through the suction area,
the air that has flowed into the front grille assembly(142) through the air inlet port(144), the heat exchange with the refrigerant when passing through the heat exchanger(136) and has air temperature changed accordingly,
after temperature change, air is sucked thorough the rotor fan(102), flows through an air flow path formed in the chassis scroll(108), and is blown out of the blowout port(112),
the air blown out of the rotor fan(102) is supplied into the indoor space through the blowout port(112), this air adjusts the temperature of the air in the indoor space,
the blow-out path(128) is provided with the expanded portion(130) whose cross-sectional shape changes from a rectangular shape to an isosceles shape having a portion near the second extension wall(120) that is higher in width than the tongue portion(116) near the first extension wall(118),
the inclined surfaces of the side wall one(122) and the side wall two(124) allows the portion of the expanded portion(130) near the second extension wall(120),
the expanded portion(130) of the blow-out path(128) is configured such that the distance between the first extension wall(118) and the second extension wall(120) increases from the upstream side to the downstream side of the expanded portion(130), so that the cross-sectional area of the path is increased,
when the blown air that has flowed into the blow-out path(128) passes through the expanded portion(130), the flow is expanded, and there is increase in discharge surface area of blown air in the downstream portion of the blow-out path(128) near the second extension wall(120) is increase,
the blown air flows to every part of the blow-out path(128) even on the down­ stream side, and is blown out of the blowout port(112)
this avoids the blown air from being separated from the second extension wall(120) during the high-load operation and blocks the air from reversely flowing from the end portions of the blowout port(112).