Description:SELF-COOLING OIL FREE ELECTRIC BLOWER AND METHOD THEREOF
FIELD OF THE INVENTION
The present invention relates to an oil free electric blower. More particularly, the present invention relates to a self-cooling oil free electric blower with airfoil bearings which prevents excessive temperature rise and lower cooling power consumption by efficiently dissipating heat, thereby maintaining the blower's performance and operational efficiency. Advantageously, the present invention improves the cooling performance and simplifies the blower design without using sealing.
BACKGROUND OF THE INVENTION
Blower is an electrical device that blows air and makes air flow by the rotational movement of vanes or blades. Blowers are usually enclosed in a housing or casing and used to provide ventilation or air circulation and transfer air in the emitted environment at high or low pressure and rotate the fan with the force received from the motor.
Electric blowers are widely used in various applications such as wastewater treatment, pharma, and food industries. These blowers generate heat during their operation, which can adversely affect their performance and longevity, and also affect the components of the blower. Therefore, effective, and optimum thermal management is crucial for maintaining the blower's efficiency and preventing damage due to overheating.
To overcome the above disadvantages, there is a need for effective thermal management for an air-cooled electric blower.
Some of the prior arts are:
KR20080105573A, discloses a rotating device having cooler for bearing comprising an airfoil journal bearing (130, 150) are equipped at the end of a stator and supports the weight the radial direction of a rotor. An airfoil thrust bearing is equipped between the airfoil journal bearing of the rear end and stator. A cooling unit (160) is equipped around the stator, the airfoil journal bearing, and the airfoil thrust bearing. A second water jacket (165) surrounds the first water jacket and the airfoil journal bearing, and third water jacket (168) surrounds the airfoil journal bearing and airfoil thrust bearing.
US7988426B2, discloses a compressor ported shroud for foil bearing cooling which takes compressed air from the shroud of the compressor before it is completely compressed and delivers it to foil bearings. The compressed air has a lower pressure and temperature than compressed outlet air. The lower temperature of the air means that less air needs to be bled off from the compressor to cool the foil bearings. This increases the overall system efficiency due to the reduced mass flow requirements of the lower temperature air. By taking the air at a lower pressure, less work is lost compressing the bearing cooling air.
KR101847165B1, discloses a cooling channel structure of turbo blower with airfoil bearing which uniformly cools airfoil bearings, stators and rotors of a motor, and a motor housing while improving cooling performance. Moreover, when each of the bearings is defective, fragments are not moved to the other bearings. Therefore, the present invention can prevent damage to the bearings and damage to a shaft of the rotor.
However, the conventional cooling structure for air-cooled electric blower as discussed in the prior art requires relatively large amount of power used to drive the cooling fan, gives low power output, and does not meet emission norms, and have sealing behind the impeller to avoid the blow by.
Accordingly, there is a need for an improved self-cooling oil free electric blower, which reduces the risk of overheating and thermal damage, thereby extending the lifespan of the blower.
OBJECT OF THE INVENTION
The main objective of the present invention is to provide a self-cooling oil free electric blower which reduces the risk of overheating and thermal damage, thereby extending the lifespan of the electric blower.
Another objective of the present invention is to provide a self-cooling oil free electric blower, which optimizes the bearing, rotor, and stator cooling requirements.
Another objective of the present invention is to provide a self-cooling oil free electric blower, which simplifies the blower design without sealing.
Another objective of the present invention is to provide a self-cooling oil free electric blower, which efficiently regulates the temperature of the blower.
SUMMARY OF THE INVENTION
It is a primary aspect of the present invention to provide a self-cooling oil free electric blower (1000), comprising: a motor housing comprising an intake port (101) and an exhaust port (102), a fan (100), a cooling air outlet port (103), an impeller (200), an inlet port (201), an outlet port (202), a thrust runner (402), a compressor back plate (30), two or more temperature sensors, and a control unit, wherein the motor housing comprising a stator (300) enclosed by a cover (20), and a rotor mounted on the inner side of the stator and having a magnet (401) coupled to a rotor shaft (400), wherein the fan (100) housed on a fan housing (10) is coupled to the rear side of the rotor shaft (400) and is configured to rotate together, and is driven by motor for drawing air from the atmosphere through the intake port (101) and blowing air out through the exhaust port (102), wherein the impeller (200) is fixed to the front side of the rotor shaft (400) and rotated together, and configured to suck the air through the inlet port (201) and discharge the pressurized air through the outlet port (202), wherein the thrust runner (402) is coupled to the rotor shaft (400) and rotated together with rotor shaft (400), and wherein the control unit and temperature sensors are serially connected at critical locations, wherein the self-cooling oil free electric blower (1000) comprises:
a. two or more radial airfoil bearings (500a, b) mounted on a bearing housing (502) are coupled to the motor housing and rotatably supported by the rotor shaft (400) and spaced apart from a front side and a rear side of the rotor shaft (400), wherein two or more radial airfoil bearings (500a, b) are configured to support the radial load of the rotor shaft (400),
b. two or more thrust airfoil bearings (501a, b) mounted on the bearing housing (502) are disposed on both sides of the thrust runner (402) in the axial direction and mounted on the front side bearing mounting portion, wherein two or more thrust airfoil bearings (501a, b) are surrounded by the compressor back plate (30) and configured to support the axial load of the rotary shaft (400), and
c. a heat sink (301) with axial fins is configured to interface with stator, to enhance heat dissipation and provided with interference fitting to enhance thermal conductivity to the outside environment,
wherein the air from the inlet port (201) asses to the impeller (200) which produces the pressurized cooling air and then flows this pressurized cooling air to the compressor and portion of the cooling air is escaped through the gap between the impeller (200) and the compressor back plate (30), and flows through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools the two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b) and then discharged to the outside of the motor housing through the exhaust port (102), and portion of the cooling air is flows through the gap between the stator (300) and the bearing housing (502) and discharged to the atmosphere through the cooling air outlet port (103), and simultaneously the fan (100) blows air to the stator (300) through shaft collector to cool the stator and pass through the heat sink (301) and discharged to the atmosphere through the cooling air outlet port (103).
Another aspect of the present invention to provide a self-cooling oil free electric blower (1000), comprising: a motor housing comprising an intake port (101) and an exhaust port (102), a cooling air outlet port (103), an impeller (200), an inlet port (201), an outlet port (202), a thrust runner (402), a compressor back plate (30), two or more temperature sensors, and a control unit, wherein the motor housing comprising a stator (300) enclosed by a cover (20), and a rotor mounted on the inner side of the stator and having a magnet (401) coupled to a rotor shaft (400), wherein the impeller (200) is fixed to the front side of the rotor shaft (400) and rotated together, and configured to suck the air through the inlet port (201) and discharge the pressurized air through the outlet port (202), wherein the thrust runner (402) is coupled to the rotor shaft (400) and rotated together with rotor shaft (400), and wherein the control unit and temperature sensors are serially connected at critical locations, wherein the self-cooling oil free electric blower(1000) comprises:
a. two or more radial airfoil bearings (500a, b) mounted on a bearing housing (502) are coupled to the motor housing and rotatably supported by the rotor shaft (400) and spaced apart from a front side and a rear side of the rotor shaft (400), wherein two or more radial airfoil bearings (500a, b) are configured to support the radial load of the rotor shaft (400),
b. two or more thrust airfoil bearings (501a, b) mounted on a bearing housing (502) are disposed on both sides of the thrust runner (402) in the axial direction and mounted on the front side bearing mounting portion, wherein two or more thrust airfoil bearing (501a, b) are surrounded by the compressor back plate (30) and configured to support the axial load of the rotary shaft (400),
c. a heat sink (301) with axial fins is configured to interface with stator, to enhance heat dissipation and provided with interference fitting to enhance thermal conductivity to the outside environment, and
d. an end cap (600) is attached to the cover (20), wherein the air from the inlet port (201) passes to the impeller (200) which produces the pressurized cooling air and then flows this pressurized cooling air to the compressor and portion of the cooling air is escaped through the gap between the impeller (200) and the compressor back plate (30), and flows through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b) and then flows through the stator (300) for cooling the stator (300) and discharged to the atmosphere through the cooling air outlet port (103).
Another aspect of the present invention is to provide a method of cooling an oil free electric blower (1000) using a fan (100), said method comprising:
a. operating an oil free electric blower (1000);
b. blowing air from the inlet port (201) to the impeller (200) which produces the pressurized cooling air;
c. flowing of the pressurized cooling air to the compressor;
d. flowing small portion of the pressurized cooling air through the gap between the impeller (200) and the compressor back plate (30), and passing through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b);
e. discharging the pressurized cooling air to the outside of the motor housing through the exhaust port (102);
f. flowing small portion of the cooling air through the gap between the stator (300) and the bearing housing (502) and discharging to the atmosphere through the cooling air outlet port (103);
g. simultaneously blowing air by the fan (100) to the stator (300) through shaft collector to cool the stator (300), passing through the heat sink (301) and discharging to the atmosphere through the cooling air outlet port (103);
h. simultaneously sensing the temperature of the stator (300), the rotor, two or more radial airfoil bearings (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components using the temperature sensor;
i. sending the temperature reading noted by temperature sensor to the control unit;
j. monitoring and comparing the noted temperature reading with threshold by control unit, and
k. sending an alert by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.
Another aspect of the present invention is to provide a method of cooling an oil free electric blower (1000) without using a fan (100), said method comprising:
d. operating an oil free electric blower (1000);
e. blowing air from the inlet port (201) to the impeller (200) which produces the pressurized cooling air;
f. flowing the pressurized cooling air to the compressor;
g. flowing small portion of the pressurized cooling air through the gap between the impeller (200) and the compressor back plate (30) and passing through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b);
h. blocking the pressurized cooling air and directing it to flows through the stator (300) by the end cap (600) at second radial airfoil bearings (500b) and flowing out to the atmosphere through the cooling air outlet port (103);
i. simultaneously sensing the temperature of the stator (300), the rotor, two or more radial airfoil bearings (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components using the temperature sensor;
j. sending the temperature reading noted by temperature sensor to the control unit;
k. monitoring and comparing the noted temperature reading with threshold by control unit, and
l. sending an alert by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.
BRIEF DESCRIPTION OF DRAWINGS
The embodiment of the present invention is illustrated with the help of accompanying drawings.
Figure 1 illustrates a view of a self-cooling oil free electric blower according to the present invention.
Figure 2 illustrates a view of a self-cooling oil free electric blower without using fan according to the present invention.
Figure 3 illustrates a view of the heat sink with axial fins according to the present invention.
Figure 4 illustrates a view of an air flow path in a self-cooling oil free electric blower with fan according to the present invention.
Figure 5 illustrates a view of air flow path in self-cooling oil free electric blower without fan according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The present invention as embodied by “a self-cooling oil free electric blower and method thereof” succinctly fulfills the above-mentioned need[s] in the art. The present invention has objective[s] arising as a result of the above-mentioned need[s], said objective[s] having been enumerated here in above.
The following description is directed to a self-cooling oil free electric blower and a method thereof as much as the objective(s) of the present invention are enumerated, it will be obvious to a person skilled in the art that, the enumerated objective(s) are not exhaustive of the present invention in its entirety and are enclosed solely for the purpose of illustration. Further, the present invention encloses within its scope and purview, any structural alternative(s) and/or any functional equivalent(s) even though, such structural alternative(s) and/or any functional equivalent(s) are not mentioned explicitly herein or elsewhere, in the present disclosure. The present invention therefore encompasses also, any improvisation[s]/modification[s] applied to the structural alternative[s]/functional alternative[s] within its scope and purview. The present invention may be embodied in other specific form[s] without departing from the essential attributes thereof.
Furthermore, the terms and phrases used herein are not intended to be limiting, but rather are to provide an understandable description. Throughout this specification, the use of the word "comprise" and variations such as "comprises" and "comprising" may imply the inclusion of an element or elements not specifically recited.
The conventional cooling channels in blowers fan and these blowers have sealing behind the impeller to avoid the blow by. Present invention provides improved power consumptions with optimized cooling performance. The system incorporates various innovative features to efficiently regulate the temperature of the blower unit which is described in various embodiments provided below.
The present invention provides a self-cooling oil free electric blower(1000), the cooling structure for a self-cooling oil free electric blower protects the blower from overheating and consumes minimum power for cooling or self-cooling. The present invention further utilizes the secondary air flow from centrifugal compressor efficiently thus reducing the temperature of the blower parts.
Referring to Figures 1 to 5, in an embodiment of the present invention, is provided a self-cooling oil free electric blower (1000), comprising: a motor housing comprising an intake port (101) and an exhaust port (102), a fan (100), a cooling air outlet port (103), an impeller (200), an inlet port (201), an outlet port (202), a thrust runner (402), a compressor back plate (30), two or more temperature sensors, and a control unit. The motor housing comprising a stator (300) enclosed by a cover (20), and a rotor mounted on the inner side of the stator and having a magnet (401) coupled to a rotor shaft (400), wherein the fan (100) housed on the fan housing (10) and coupled to the rear side of the rotor shaft (400) and is configured to rotate together. Both the compressor and fan are driven by the motor for drawing air from the atmosphere through the intake port (101) and blowing air out through the exhaust port (102).
The impeller (200) is fixed to the front side of the rotor shaft (400) and rotated together, and configured to suck the air through the inlet port (201) and discharge the pressurized air through the outlet port (202), The thrust runner (402) is coupled to the rotor shaft (400) and rotated together with rotor shaft (400), and wherein the control unit and temperature sensors are serially connected at critical locations. In the present embodiment, the self-cooling oil free electric blower (1000) comprises:
a. two or more radial airfoil bearings (500a, b) mounted on a bearing housing (502) are coupled to the motor housing and rotatably supported by the rotor shaft (400) and spaced apart from a front side and a rear side of the rotor shaft (400), wherein two or more radial airfoil bearings (500a, b) are configured to support the radial load of the rotorshaft (400),
b. two or more thrust airfoil bearings (501a, b) mounted on a bearing housing (502) are disposed on both sides of the thrust runner (402) in the axial direction and mounted on the front side bearing mounting portion, wherein two or more thrust airfoil bearings (501a, b) are surrounded by the compressor back plate (30), and configured to support the axial load of the rotary shaft (400), and
c. a heat sink (301) with axial fins is configured to interface with stator, to enhance heat dissipation and provided with interference fitting to enhance thermal conductivity to the outside environment, the heat sink interfaced with the stator core increases efficiency of the heat dissipation by increasing the surfacer are.
During operation, the air from the inlet port (201) passes to the impeller (200) which produces the pressurized cooling air that flows to the compressor and portion of the cooling air, which is the secondary air flow from the centrifugal compressor escapes through the gap between the impeller (200) and the compressor back plate (30), during this process it further flows through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil bearings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b) and then discharged to the outside of the motor housing through the exhaust port (102), simultaneously a portion of the cooling air also flows through the gap between the stator (300) and the bearing housing (502) and discharged to the atmosphere through the cooling air outlet port (103).
In the first embodiment, the fan (100) blows cooling air to the stator (300) simultaneously along with the compressor, through shaft collector to cool the stator and pass through the heat sink (301) and discharged to the atmosphere through the cooling air outlet port (103).
In another embodiment, the secondary air flow cools the two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b) and the air from the fan cools the stator.
In the preferred embodiment of the present invention, the temperature sensors are positioned in the stator winding heads, radial airfoil bearing (500a, b) and thrust airfoil bearings (501a, b), the heat sink (301), and other electronic components.
In a preferred embodiment of the present invention, the secondary air flow and fan flow paths are combined in cooling channel structure and allowed to flow through only one vent or cooling air outlet port (103).
In the preferred embodiment of the present invention, the temperature sensors sense the temperature and send it to the control unit.
In the preferred embodiment of the present invention, the control unit is configured to monitor the temperature readings and compare it with the threshold. If it exceeds the threshold, the control unit shuts down the electric blower.
In the preferred embodiment of the present invention, the impeller (200) is driven by the high-speed motor capable of rotating at high speed by an inverter.
In the preferred embodiment of the present invention, the thrust runner (402) is disposed between the impeller (200) and the front side of the radial airfoil bearing (500a, b).
In the preferred embodiment of the present invention, the heat sink (301) is made of a material with high thermal conductivity, selected from the group consisting of copper or aluminum.
Another embodiment of the present invention to provide a self-cooling oil free electric blower (1000), comprising: a motor housing comprising an intake port (101) and an exhaust port (102), a cooling air outlet port (103), an impeller (200), an inlet port (201), an outlet port (202), a thrust runner (402), a compressor back plate (30), two or more temperature sensors, and a control unit, wherein the motor housing comprising a stator (300) enclosed by a cover (20), and a rotor mounted on the inner side of the stator and having a magnet (401) coupled to a rotor shaft (400), wherein the impeller (200) is fixed to the front side of the rotor shaft (400) and rotated together, and configured to suck the air through the inlet port (201) and discharge the pressurized air through the outlet port (202), wherein the thrust runner (402) is coupled to the rotor shaft (400) and rotated together with rotor shaft (400), wherein the control unit and temperature sensors are serially connected at critical locations, and wherein the self-cooling oil free electric blower(1000) comprises:
a. two or more radial airfoil bearings (500a, b) mounted on a bearing housing (502) are coupled to the motor housing and rotatably supported by the rotor shaft (400) and spaced apart from a front side and a rear side of the rotor shaft (400), wherein two or more radial airfoil bearings (500a, b) are configured to support the radial load of the rotorshaft (400),
b. two or more thrust airfoil bearings (501a, b) mounted on a bearing housing (502) are disposed on both sides of the thrust runner (402) in the axial direction and mounted on the front side bearing mounting portion, wherein two or more thrust airfoil bearings (501a, b) are surrounded by compressor back plate (30) and configured to support the axial load of the rotary shaft (400),
c. a heat sink (301) with axial fins is configured to interface with stator, to enhance heat dissipation and provided with interference fitting to enhance thermal conductivity to the outside environment, and
d. an end cap (600) is attached to the cover (20),
wherein the air from the inlet port (201) passes to the impeller (200) which produces the pressurized cooling air and then flows this pressurized cooling air to the compressor and portion of the cooling air, that is a secondary air flow, escapes through the gap between the impeller (200) and the compressor back plate (30), and then flows through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b) and then flows through the stator (300) for cooling the stator (300) and discharged to the atmosphere through the cooling air outlet port (103).
In the preferred embodiment of the present invention, the end cap (600) at second radial airfoil bearings (500b) is provided to block the pressurized cooling air and direct the cooling air flows through the stator (300) and flows out to the atmosphere through the cooling air outlet port (103).
Another embodiment of the present invention to provide a method for cooling an oil free electric blower (1000) using a fan (100), said method comprising:
a. operating an oil free electric blower (1000);
b. blowing air from the inlet port (201) to the impeller (200) which produces the pressurized cooling air;
c. flowing of the pressurized cooling air to the compressor;
d. flowing small portion of the pressurized cooling air through the gap between the impeller (200) and the compressor back plate (30), and passing through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearing (501a, b), the rotor and two or more radial airfoil beating (500a, b);
e. discharging the pressurized cooling air to the outside of the motor housing through the exhaust port (102);
f. flowing small portion of the cooling air through the gap between the stator (300) and the bearing housing (502) and discharging to the atmosphere through the cooling air outlet port (103);
g. simultaneously blowing air by the fan (100) to the stator (300) through shaft collector to cool the stator (300), passing through the heat sink (301) and discharging to the atmosphere through the cooling air outlet port (103);
h. simultaneously sensing the temperature of the stator (300), the rotor, two or more radial airfoil bearings (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components using the temperature sensors;
i. sending the temperature reading noted by temperature sensor to the control unit;
j. monitoring and comparing the noted temperature reading with threshold by control unit, and
k. sending an alert by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.
Another embodiment of the present invention to provide a method of cooling an oil free electric blower (1000) without using a fan (100), said method comprising:
a. operating an oil free electric blower (1000);
b. blowing air from the inlet port (201) to the impeller (200) which produces the pressurized cooling air;
c. flowing the pressurized cooling air to the compressor;
d. flowing small portion of the pressurized cooling air through the gap between the impeller (200) and the compressor plate (30), and passing through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b);
e. blocking the pressurized cooling air and directing it to flows through the stator (300) by the end cap (600) at the second radial airfoil bearing (500b) and flowing out to the atmosphere through the cooling air outlet port (103);
f. simultaneously sensing the temperature of the stator (300), the rotor, two or more radial airfoil bearings (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components using the temperature sensors;
g. sending the temperature reading noted by temperature sensor to the control unit;
h. monitoring and comparing the noted temperature reading with threshold by control unit, and
i. sending an alert by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.
For Illustration:
WORKING
An oil free electric blower with fan:
An oil free electric blower (1000) is operated. The air from the inlet port (201) is blown to the impeller (200) which produces the pressurized cooling air. The pressurized cooling air is flown to the compressor. The small portion of the pressurized cooling air is flown through the gap between the impeller (200) and the compressor back plate (30) and passed through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b). The pressurized cooling air is discharged to the outside of the motor housing through the exhaust port (102). A small portion of the cooling air, i.e., the secondary air flow from the compressor is flown through the gap between the stator (300) and the bearing housing (502) and discharged to the atmosphere through the cooling air outlet port (103). The air is simultaneously blown by the fan (100) to the stator (300) through shaft collector to cool the stator (300), passed through the heat sink (301) and discharged to the atmosphere through the cooling air outlet port (103). The temperature of the stator (300), the rotor, two or more radial airfoil bearings (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components are simultaneously sensed using the temperature sensors and sent to the control unit. The noted temperature reading is monitored and compared with threshold by control unit, and an alert is sent by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.
An oil free electric blower without fan:
An oil free electric blower (1000) is operated. The air from the inlet port (201) is blown to the impeller (200) which produces pressurized cooling air. The pressurized cooling air is flown to the compressor. A small portion of the pressurized cooling air is flown through the gap between the impeller (200) and the compressor back plate (30) and passed through two or more thrust airfoil bearing (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b). The pressurized cooling air is blocked and directed it to flows through the stator (300) by the end cap (600) at the second radial airfoil bearing (500b) and flown out to the atmosphere through the cooling air outlet port (103). The temperature of the stator (300), the rotor, two or more radial airfoil bearings (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components are simultaneously sensed using the temperature sensors and sent to the control unit. The noted temperature reading is monitored and compared with threshold by control unit, and an alert is sent by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.
ADVANTAGES OF THE PRESENT INVENTION
1. The present invention reduces the risk of overheating and thermal damage, thereby extending the lifespan of the electric blower.
2. The present invention provides continuous flow of air circulation for cooling and maintains optimal operating temperatures, thus preventing overheating.
3. The present invention does not use any sealing which makes the blower designs simpler.
It will be apparent to a person skilled in the art that the above description is for illustrative purposes only and should not be considered as limiting. Various modifications, additions, alterations, and improvements without deviating from the spirit and the scope of the invention may be made by a person skilled in the art.
List of Reference Numerals
(10) Fan housing
(20) Cover
(30) Compressor back plate
(100) Core fan
(101) Intake port
(102) Exhaust port
(103) Cooling air outlet port
(200) Impeller
(201) Inlet port
(202) Outlet port
(300) Stator
(301) Heat sink
(400) Rotor shaft
(401) Magnet
(402) Thrust runner
(500a, b) Radial airfoil bearings
(501a, b) Thrust airfoil bearings
(502) Bearing housing
(600) End cap
(1000) Self-cooling oil free electric blower

, Claims:WE CLAIM:
1. A self-cooling oil free electric blower (1000), comprising:
a motor housing comprising an intake port (101) and an exhaust port (102), a fan (100), a cooling air outlet port (103), an impeller (200), an inlet port (201), an outlet port (202), a thrust runner (402), a compressor back plate (30), two or more temperature sensors, and a control unit, wherein the motor housing comprising a stator (300) enclosed by a cover (20), and a rotor mounted on the inner side of the stator and having a magnet (401) coupled to a rotor shaft (400),wherein the fan (100) housed on the fan housing (10) is coupled to the rear side of the rotor shaft (400) and is configured to rotate together, and is driven by motor for drawing air from the atmosphere through the intake port (101) and blowing air out through the exhaust port (102),wherein the impeller (200) is fixed to the front side of the rotor shaft (400) and rotated together, and configured to suck the air through the intake port (201) and discharge the pressurized air through the exhaust port (202), wherein the thrust runner (402) is coupled to the rotor shaft (400) and rotated together with rotor shaft (400), and wherein the control unit and temperature sensors are serially connected at critical locations.
Characterized in that: the self-cooling oil free electric blower (1000) comprises:
a. two or more radial airfoil bearings (500a, b) mounted on a bearing housing (502) are coupled to the motor housing and rotatably supported by the rotor shaft (400) and spaced apart from a front side and a rear side of the rotor shaft (400), wherein two or more radial airfoil bearings (500a, b) are configured to support the radial load of the rotorshaft (400),
b. two or more thrust airfoil bearings (501a, b) mounted on a bearing housing (502) are disposed on both sides of the thrust runner (402) in the axial direction and mounted on the front side bearing mounting portion, wherein two or more thrust airfoil bearings (501a, b) are surrounded by compressor back plate (30) and configured to support the axial load of the rotary shaft (400), and
c. a heat sink (301) with axial fins is configured to interface with stator, to enhance heat dissipation and provided with interference fitting to enhance thermal conductivity to the outside environment,
wherein the air from the inlet port (201) passes to the impeller (200) which produces the pressurized cooling air and then flows this pressurized cooling air to the compressor and portion of the cooling air, that is the secondary air flow, escapes through the gap between the impeller (200) and the compressor back plate (30), and flows through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearings (501a, b), the rotor and two or more radial airfoil beatings (500a, b) and then discharged to the outside of the motor housing through the exhaust port (102), and portion of the cooling air, that is secondary air from compressor, flows through the gap between the stator (300) and the bearing housing (502) and discharged to the atmosphere through the cooling air outlet port (103), and simultaneously the fan (100) blows air to the stator (300) through shaft collector to cool the stator and pass through the heat sink (301) and discharged to the atmosphere through the cooling air outlet port (103), comprises a second cooling channel.

2. The self-cooling oil free electric blower (1000) as claimed in claim 1, wherein the temperature sensors are positioned in the stator winding heads, two or more radial airfoil bearings (500a, b) and thrust airfoil bearings (501a, b), the heat sink (301), and other electronic components.

3. The self-cooling oil free electric blower (1000) as claimed in claim 1, wherein the temperature sensors sense the temperature and send it to the control unit.

4. The self-cooling oil free electric blower (1000) as claimed in claim 1, wherein the control unit is configured to monitor the temperature readings and compare it with the threshold. If it exceeds the threshold, the control unit shuts down the electric blower.

5. The self-cooling oil free electric blower (1000) as claimed in claim 1, wherein the impeller (200) is driven by the high-speed motor capable of rotating at high speed by an inverter.

6. The self-cooling oil free electric blower (1000) as claimed in claim 1, wherein the thrust runner (402) is disposed between the impeller (200) and the front side of the first radial airfoil bearing (500a),

7. The self-cooling oil free electric blower (1000) as claimed in claim 1, wherein the heat sink (301) is made of a material with high thermal conductivity, selected from the group consisting of copper or aluminum.

8. A self-cooling oil free electric blower (1000), comprising:
a motor housing comprising an intake port (101) and an exhaust port (102), a cooling air outlet port (103), an impeller (200), an inlet port (201), an outlet port (202), a thrust runner (402), a compressor back plate (30), two or more temperature sensors, and a control unit, wherein the motor housing comprising a stator (300) enclosed by a cover (20), and a rotor mounted on the inner side of the stator and having a magnet (401) coupled to a rotor shaft (400), wherein the impeller (200) is fixed to the front side of the rotor shaft (400) and rotated together, and configured to suck the air through the inlet port (201) and discharge the pressurized air through the outlet port (202), wherein the thrust runner (402) is coupled to the rotor shaft (400) and rotated together with rotor shaft (400), and wherein the control unit and temperature sensors are serially connected at critical locations.

a. Characterized in that: the self-cooling oil free electric blower (1000) comprises: two or more radial airfoil bearings (500a, b) mounted on a bearing housing (502) are coupled to the motor housing and rotatably supported by the rotor shaft (400) and spaced apart from a front side and a rear side of the rotor shaft (400), wherein two or more radial airfoil bearings (500a, b) are configured to support the radial load of the rotorshaft (400),
b. two or more thrust airfoil bearings (501a, b) mounted on a bearing housing (502) are disposed on both sides of the thrust runner (402) in the axial direction and mounted on the front side bearing mounting portion, wherein two or more thrust airfoil bearings (501a, b) are surrounded by the compressor back plate (30) configured to support the axial load of the rotary shaft (400),
c. a heat sink (301) with axial fins is configured to interface with stator, to enhance heat dissipation and provided with interference fitting to enhance thermal conductivity to the outside environment, and
d. an end cap (600) is attached to the cover (20),
wherein the air from the inlet port (201) passes to the impeller (200) which produces the pressurized cooling air and then flows this pressurized cooling air to the compressor and portion of the cooling air is escaped through the gap between the impeller (200) and the compressor back plate (30) and flows through two or more thrust airfoil bearings (501, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearing (501a, b), the rotor and two or more radial airfoil beating (500a, b) and then flows through the stator (300) for cooling the stator (300) and discharged to the atmosphere through the cooling air outlet port (103).

9. The self-cooling oil free electric blower as claimed in claim 8, wherein the end cap (600) at the second radial airfoil bearing (500b) is provided to block the pressurized cooling air and direct the cooling air flows through the stator (300) and flows out to the atmosphere through the cooling air outlet port (103).

10. A method of cooling an oil free electric blower (1000) as claimed in claim 1, said method comprising:

a. operating an oil free electric blower;
b. blowing air from the inlet port (201) to the impeller (200) which produces the pressurized cooling air;
c. flowing of the pressurized cooling air to the compressor;
d. flowing small portion of the pressurized cooling air through the gap between the impeller (200) and the compressor back plate (30), and passing through two or more thrust airfoil bearings (501a, b), the rotor, and two or more radial airfoil beatings (500a, b) which cools two or more thrust airfoil bearing (501a, b), the rotor and two or more radial airfoil bearings (500a, b), comprises a first cooling channel;
e. discharging the pressurized cooling air to the outside of the motor housing through the exhaust port (102);
f. flowing small portion of the cooling air through the gap between the stator (300) and the bearing housing (502) and discharging to the atmosphere through the cooling air outlet port (103);
g. simultaneously a second cooling channel comprises air flow from the fan (100) to the stator (300) through shaft collector to cool the stator (300), passing through the heat sink (301) and discharging to the atmosphere through the cooling air outlet port (103);
h. simultaneously sensing the temperature of the stator (300), the rotor, two or more radial airfoil bearing (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components using the temperature sensors;
i. sending the temperature reading noted by temperature sensor to the control unit;
j. monitoring and comparing the noted temperature reading with threshold by control unit, and
k. sending an alert by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.

11. A method of cooling an oil free electric blower (1000) as claimed in claim 8, said method comprising:
a. operating an oil free electric blower;
b. blowing air from the inlet port (201) to the impeller (200) which produces the pressurized cooling air;
c. flowing the pressurized cooling air to the compressor;
d. flowing small portion of the pressurized cooling air through the gap between the impeller (200) and the compressor back plate (30), and passing through two or more thrust airfoil bearing (501a, b), the rotor, and two or more radial airfoil beating (500a, b) which cools the thrust airfoil bearing (501), the rotor and the radial airfoil beating (500);
e. blocking the pressurized cooling air and directing it to flows through the stator (300) by the end cap (600) at the second radial airfoil bearing (500b) and flowing out to the atmosphere through the cooling air outlet port (103);
f. simultaneously sensing the temperature of the stator (300), the rotor, two or more radial airfoil bearings (500a, b), two or more thrust airfoil bearings (501a, b), and other electronic components using the temperature sensors;
g. sending the temperature reading noted by temperature sensor to the control unit;
h. monitoring and comparing the noted temperature reading with threshold by control unit, and
i. sending an alert by the control unit to shut down the electric blower if the noted temperature reading exceeds the threshold.

-SD-
Dated this 22nd day of January 2024 Kalyanchand Jhabakh (IN/PA-830)
Agent for Applicant