KR102157459B1 - Turboblower Having Superior Efficiency - Google Patents

Abstract

A turbo blower with excellent cooling performance of a high-speed motor is introduced. The high-speed motor is cooled by using part of the intake air by the impeller, and this intake air is supplied back to the impeller to be compressed and blown. Intake air introduced into the casing is guided to move along the cooling flow path of the stator by the rear bearing housing. Intake air into the second space between the front bearing housing and the stator moves to the third space through the gap between the rotor and the stator, and is discharged to the cooling air discharge hole through a through hole provided in the rear bearing housing.

Description

High Efficiency Turbo Blower {Turboblower Having Superior Efficiency}

It relates to a turbo blower, particularly a high-efficiency turbo blower having excellent cooling performance of a high-speed motor.

A turbo blower is known that uses the rotational force of an impeller coupled to a high-speed motor. Air sucked into the turbo blower is pressurized by the centrifugal force of the impeller and blown at high speed. Turbo blowers are widely used in industrial sites that require blowing of pressure air, such as aeration facilities in sewage or wastewater treatment plants, and powder transfer.

Recently, there is a high demand for large capacity and high efficiency in the turbo blower field. It is necessary to increase the speed and output of the turbo blower. To this end, the high-speed motor needs to be effectively cooled so that it can operate with optimum efficiency. Cooling of a high-speed motor has an absolute influence on the motor's output and life.

A cooling fan is used to cool the high-speed motor. The cooling fan is installed at the end of the rotor from the side opposite the impeller. The cooling fan rotates with the rotor and blows cooling air into the high-speed motor. Since the rotational force of the rotor is used to rotate the cooling fan, the cooling fan causes a decrease in efficiency of the high-speed motor.

The rotor rotating at high speed is supported by airfoil bearings or magnetic bearings that do not require lubricant. The rotor is floated by the air film built up between the airfoil bearing and the rotating rotor, allowing it to rotate without friction or noise. The air foil bearing includes a top foil that directly supports the rotor and a bump foil that exhibits practical damping performance.

The present invention is based on the recognition of the prior art as described above, and an object of the present invention is to provide a high-efficiency turbo blower having excellent motor cooling performance.

The problem to be solved in the present invention is not necessarily limited to the above-mentioned matters, and other problems that are not already mentioned may be understood by the matters described below.

According to an embodiment of the present invention for achieving the above object, a high-efficiency turbo blower includes a casing having a rear cover coupled to a rear end; A high-speed motor having a rotor and a stator, wherein a cooling passage extends in a longitudinal direction along an outer peripheral surface of the stator; An air intake unit having an impeller connected to a front end of the rotor and an impeller housing surrounding the impeller; One end is connected at the first position and the other end is a bypass flow path connected to the cooling air inlet hole provided in the casing, and the first position is provided at the air intake unit or outside the turbo blower; One end is connected to the cooling air discharge hole provided in the casing so that the air cooled by the high-speed motor can be discharged, and the other end is a return passage connected to the second position of the air intake part, and the second position is located closer to the impeller than the first position. The air introduced into the air intake at the second position is supplied to the impeller and discharged through the discharge pipe; Front and rear bearing housings disposed on both sides of the stator of the high-speed motor and for supporting the rotor; A first space configured to allow external air introduced through the cooling air inlet hole to be guided to the cooling passage in the front by the rear bearing housing; The second space between the front bearing housing and the stator, and the air in the first space is introduced into the second space through the cooling channel; A third space between the rear bearing housing and the stator; And a fourth space provided between the rear bearing housing and the rear cover and in communication with the cooling air discharge hole, and a through hole connecting the third space and the fourth space is provided in the rear bearing housing, and from the second space Air introduced into the third space through the gap between the rotor and the stator is configured to be discharged into the fourth space through the through hole.

According to the present invention, since the high-speed motor is effectively cooled by using an impeller having superior air intake performance and efficiency instead of a low-efficiency cooling fan, the high-speed motor cooling performance and the efficiency of the turbo blower are improved.

According to the present invention, since the cooling fan can be omitted, parts necessary for mounting the cooling fan can be omitted. As a whole, the number of parts is reduced, reducing the cost of parts, reducing assembly man-hours, and reducing weight. In addition, since the number of parts of the rotor assembly that rotates at high speed is reduced, it is possible to prevent a decrease in tolerance and precision that may occur in the disassembly and assembly process of parts for maintenance, and it is possible to guarantee the stability of the rotor at high speed.

In addition, according to the present invention, since the cooling air used by bypassing part of the intake air by the impeller is supplied back to the impeller for compression and blowing, it is possible to effectively cool the high-speed motor without reducing capacity or loss of flow rate.

Further, according to the present invention, the circulation flow of cooling air in the casing is very smooth. In particular, the flow of cooling air along the cooling flow path of the stator and the flow of cooling air along the gap between the rotor and the stator are good, and thus the cooling performance of the high-speed motor is excellent.

According to the present invention, the high-speed motor cooling performance is excellent, so that the efficiency of the high-speed motor can be optimally maintained, and the output of the high-speed motor can be improved and the lifespan can be extended.

1 is a schematic cross-sectional view of a turbo blower according to an embodiment of the present invention.
FIG. 2 shows a flow of motor cooling air when the turbo blower shown in FIG. 1 is operated.
3 is a schematic cross-sectional view along the line marked AA in FIG. 2.
Figure 4 shows that the turbo blower of Figure 1 is installed in the outer case according to an embodiment of the present invention.
FIG. 5 is a view of the inside of the outer case shown in FIG. 4 viewed from the front (X direction in FIG. 4).
6 shows a turbo blower according to another embodiment of the present invention.
7 shows a turbo blower according to another embodiment of the present invention.
8 shows a turbo blower according to another embodiment of the present invention.

Hereinafter, examples will be described in more detail so that various characteristic aspects of the present invention can be understood. In the drawings, the same or equivalent elements may be denoted by the same reference numerals, and the drawings may be exaggerated or schematically illustrated for an intuitive understanding of the features of the present invention.

In this document, unless otherwise limited, that the second element is placed on'on' the first element or that the two elements are'connected' to each other means that the two elements are in direct contact with each other, as well as of the first and second elements. It allows a third element to be interposed between the elements. Directions such as front and rear, left and right or up and down are for convenience of description and do not limit the scope of the present invention.

1 is a schematic cross-section of a turbo blower 1 according to an embodiment.

Referring to FIG. 1, the turbo blower 1 includes a casing 10, high-speed motors 21, 22 and 20 built in the casing 10, and an air intake part 30 in front of the high-speed motor 20.

The casing 10 includes a cylindrical body surrounding the high-speed motor 20 and a rear cover 19 coupled to the rear end of the body. A cooling air inlet hole 13 is provided in the radial direction at the rear end of the body, and a cooling air discharge hole 16 is provided in the center of the rear cover 19.

The high-speed motor 20 includes a rotor 21 installed in the front-rear direction and a stator 22 fixed to the casing 10. Both ends of the rotor 21 may be supported by bearings, such as an airfoil bearing or a magnetic bearing. A gap G is provided between the rotor 21 and the stator 22. The rotor 21 is provided with a magnet, and the stator 22 is provided with a coil 22a for rotating the rotor 21. A cooling passage 23 extends in the longitudinal direction on the outer circumferential surface of the stator 22.

Front and rear bearing housings 11 and 12 provided with bearings for supporting the rotor 21 in a radial direction, that is, a direction perpendicular to the rotation axis of the rotor 21, respectively, are provided at the front and rear of the stator 22 . According to the embodiment, the airfoil journal bearings 41 and 42 are disposed between the bearing housings 11 and 12 and the rotor 21.

The air intake unit 30 includes an impeller 31 connected to the front end of the rotor 21, specifically the front end of the shaft, and an impeller housing 32 surrounding the impeller 31. Air sucked from the outside by the rotational force of the impeller 31 is pressurized while flowing along the flow path of the impeller housing 32 to be blown at high speed. The impeller housing 32 is provided with a suction duct 33 extending toward the front. In another embodiment, the suction duct 33 may be eliminated.

A disk-shaped runner disk 24 extending in the radial direction is provided at the front end of the rotor 21. The runner disk 24 is disposed behind the impeller 31. A bearing support 18 is disposed between the impeller 31 and the runner disk 24, and a front bearing housing 11 is disposed behind the runner disk 24. Thrust airfoil bearings are interposed between the bearing support 18 and the runner disk 24, and between the front bearing housing 11 and the runner disk 24, respectively.

The rear bearing housing 12 includes a sleeve 12a surrounding the rotor 21, a support 12b extending radially outward from the sleeve 12a, and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. It has an outer wall (12c) of. The outer wall 12c is spaced apart from the casing 10 so that a first space S1 is provided between the casing 10 in the vicinity of the cooling air inlet hole 13. A journal airfoil bearing 42 is interposed between the rotor 21 and the sleeve 12a.

The rear end of the main body of the casing 10 and the rear cover 19 including the cooling air inlet hole 13 are sealed by the sealing case 3.

A bypass passage 2, specifically, a bypass pipe, is connected to the sealing case 3 as shown in FIG. 1. The bypass flow path 2 is a flow path for introducing into the casing 10 for cooling the high-speed motor 20 by bypassing a part of the air (hereinafter referred to as'cooling air') sucked from the outside by the impeller 31. One end of the bypass channel 2 is connected at a first position (see P1, FIG. 4) of the air intake unit 30, and the other end is connected to the cooling air inlet hole 13 through the sealing case 3. A separate cooling fan for cooling the high-speed motor 20 is not installed.

A return passage 4, specifically one end of the return pipe, is connected to the cooling air discharge hole 16 of the rear cover 19 as shown in FIG. 1. The return flow path 4 is a flow path for returning the cooling air to the air suction unit 30 after cooling the high-speed motor 20. The other end of the return passage 4 is connected to the impeller housing 32 at the second position P2 of the air intake 30, and in this embodiment just in front of the impeller 31. The cooling air in the casing 10 flows into the impeller 31 through the return passage 4 by negative pressure at the front end of the impeller 31. At the second position P2, the cooling air is combined with the air sucked from the outside and is blown at high speed to the discharge pipe through the impeller 31. The second position P2 is located rearward than the first position P1, that is, closer to the impeller 31 due to the external air inflow flow.

2 shows the flow of cooling air that cools the high speed motor 20 when the turbo blower 1 is operated.

1 and 2, the cooling air supplied to the first space S1 through the cooling air inlet hole 13 is a cooling flow path in the front by the rear bearing housing 12, more specifically, the outer wall 12c. It leads to (23). The first space S1 and the cooling passage 23 are placed in a straight line. The rear of the first space S1 is closed by the rear cover 19. Of course, the rear of the first space S1 may be closed by other structures in the casing 10 other than the rear cover 19.

A second space S2 is provided between the front bearing housing 11 and the stator 22, and a third space S3 is provided between the rear bearing housing 12 and the stator 22. The first to third spaces S1, S2, S3 are closed spaces configured to circulate cooling air in an intended route or direction by the rotational force of the impeller 31, respectively.

A fourth space S4 communicating with the cooling air discharge hole 16 is provided between the rear bearing housing 12 and the rear cover 19. A through hole 15 connecting the third space S3 and the fourth space S4 is provided in the rear bearing housing 12, specifically, the support part 12b.

The cooling air introduced into the first space S1 cools the stator 22 while passing through the cooling flow path 23 and then flows into the second space S2. The cooling air in the second space S2 cools the stator 22 and the rotor 21 while passing through the gap G between the rotor 21 and the stator 22 and then flows into the third space S3. The cooling air in the third space (S3) is discharged to the fourth space (S4) through the through hole (15), and is then recovered to the air intake unit (30) through the return passage (4).

A slit 14 is provided between the outer wall 12c of the rear bearing housing 12 or between the rear bearing housing 12 and the stator 22. The slit 14 allows the first space S1 and the third space S3 to communicate in a radial or radial direction. The slit 14 has a smaller width than the through hole 15. Here, the width refers to the gap between the slits 14 and the front and rear directions, or the diameter of the through hole 15 in the radial direction. Of course, the slit 14 is formed smaller than the first space S1 or the cooling passage 23.

Very part of the cooling air flowing from the first space (S1) to the cooling flow path (23) in front can flow into the third space (S3) through the slit (14), conversely, the cooling air in the third space (S3). Very part of it may flow into the first space S1. The slit 14 is a flow of cooling air in the casing 10, for example, a flow of cooling air flowing into the cooling passage 23 from the first space S1, and the third space S3 through the gap G. It does not interfere with the flow of the cooling air flowing into the fourth space (S4). In the slit 14, the cooling air flowing from the third space S3 to the fourth space S4 does not stagnate in the third space S3 and is smoothly discharged to the fourth space S4 through the through hole 15 To be able to.

The cooling air in the casing 10, specifically, the fourth space S4, is sent to the return passage 4 through the cooling air discharge hole 16. This cooling air is supplied to the impeller 31 through the second position P2 of the impeller housing 32 via the return flow path 4. The cooling air introduced from the air intake unit 30 through the bypass channel 2 is supplied to the impeller 31 through the return channel 4 as it is. It can be seen that there is no change in the blowing capacity or output of the turbo blower 1 in the normal state.

2 and 3, the stator 22 includes a winding coil 22a and a cylindrical core 22b or a case member. Cooling fins 24 are spaced apart from each other in the circumferential direction on the outer circumferential surface of the core 22b, and the cooling fins 24 extend in the longitudinal direction, that is, in the front and rear directions. A space defined by the cooling fins 24 and the casing 10 adjacent to each other constitutes the cooling passage 23.

4 shows that the turbo blower 1 is installed in the outer case 100 according to the embodiment of the present invention. The turbo blower 1 and the outer case 100 constitute a turbo blower device. In FIG. 4, X denotes the front-rear direction, Y denotes the width direction, and Z denotes the vertical height direction.

Referring to FIG. 4, the outer case 100 includes a first chamber S11 in which a turbo blower 1 is installed, a second chamber S12 in front of the first chamber S11, and a third chamber behind the first chamber S11. A thread S13 and a fourth thread S14 disposed below the first thread S11 are provided.

A suction duct 33 through which external air is introduced is disposed at the front end of the first chamber S11. External air introduced through the suction duct 33 is discharged to the outside through the discharge pipe 50 through the impeller 31.

The second chamber S12 is a space in which air introduced into the air intake unit 30 from the outside by the impeller 31 is filtered. The air filter 102 is provided in the inlet 101 in the front of the second chamber S12. The air intake unit 30 needs to be understood as a concept including a second chamber S12 through which external air is introduced. As the external air introduced into the second chamber S12 passes through the air filter 102, the pressure drops by about 0.02 atm.

The front end of the suction duct 33 is fixed to the first partition wall 111 that divides the first chamber S11 and the second chamber S12. Air introduced into the first chamber S11 through the air filter 102 is introduced into the intake duct 33 that is opened in the form of a fallopian tube. The air introduced into the suction duct 33 is collected in the impeller housing 32 and flows along the flow path in the housing 32, and is discharged to a target place through the discharge pipe 50 at high speed.

A windbreak valve 60 is connected to the discharge pipe 50. When the operation of the turbo blower 1 is not in a normal state, such as at the beginning of operation or at the stop, the wind valve 60 bypasses the pressure air below the target pressure and discharges it to the outside, thereby causing the turbo blower 1 to surge ( surge).

An electric device 110 such as an inverter for driving the high-speed motor 20 is provided in the third chamber S13. Heat generated in the third chamber S13 is cooled by external air introduced through the inlet 103 of the third chamber S13. An air filter 104 for filtering incoming air is provided at the inlet 103. The first chamber S11 and the third chamber S13 are divided by the second partition wall 112.

5 schematically illustrates a view of the inside of the outer case 100 viewed from the front (X direction).

Referring to FIGS. 4 and 5, one end of the bypass channel 2 is connected to the first partition wall 111 either directly to the suction duct 33 or at a position near the front end of the suction duct 33. Part of the air sucked from the outside by the impeller 31 is supplied into the casing 10 through the bypass channel 2 for cooling the high-speed motor 20. The other end of the bypass channel 2 is connected to the cooling air inlet hole 13 of the casing 10. The other end of the return passage 4, that is, the second position P2, is located closer to the impeller 31 than the one end of the bypass passage 2, that is, the first position P1.

The fourth chamber S14 is divided by the first and second chambers S11 and 12 and the third partition wall 113. A return passage 4 is placed in the fourth chamber S14, and an inlet 105 for introducing external air is provided. The external air introduced through the inlet 105 cools the return passage 4, and flows into the first chamber S11 through a through hole (not shown) of the third partition wall 113, and the turbo blower 1 After cooling, it is discharged through the outlets 106 and 107. An air filter may be provided at the inlet 105.

6 schematically shows a turbo blower 1 and a turbo blower device including the same according to another embodiment. Elements that are the same and similar to each other in the previous embodiment are not described redundantly.

As shown in FIG. 6, the return passage 4 may be provided with a heat dissipation part 5 for cooling the cooling air flowing therein. The cooling air heated while cooling the high-speed motor 20 in the casing 10 is cooled in the heat dissipation part 5 and supplied to the impeller 31. The radiating part 5 may be provided with radiating fins for rapid heat dissipation or elements for smooth heat exchange with cooling air. The radiating part 5 of the return passage 4 is disposed in the fourth chamber S14. The radiating part 5 may be disposed outside the outer case 100.

One end of the bypass channel 2 may be connected to the outer case 100 to directly communicate with the outside. As shown in FIG. 6, one end of the bypass channel 2 is connected to the outer case 100 at a location separate from the inlet 101. External air is directly introduced into the turbo blower 1 through one end of the bypass channel 2 by the negative pressure in the turbo blower 1. The other end of the bypass channel 2 is connected to the cooling air inlet hole 13 of the casing 10. The front end of the impeller 31 in the turbo blower 1, depending on the design, is approximately 0.03 to 0.05 atmospheres lower than atmospheric pressure. Since a large flow rate is not required as cooling air, external air can be introduced by this level of negative pressure to cool the interior of the casing 10. An air filter may be provided in the bypass channel 2.

7 schematically shows a turbo blower 1 ′ according to another embodiment. This turbo blower 1'has the opposite direction of the cooling air circulation in the casing 10 as compared to the turbo blowers described above. It will not be necessary to repeat the same and similar elements.

The turbo blower 1'of this embodiment is used for cooling the high-speed motors 21 and 22 in the casing 10 by bypassing some of the external air (hereinafter referred to as'cooling air') sucked into the air intake unit 30. It is equipped with a bypass passage (2') for. One end of the bypass channel 2'is connected to the first position (P1, not shown in FIG. 7), for example, the suction duct 33 or the first partition wall 111, or the outer case 100 to be exposed to the outside. Can be connected to The other end of the bypass channel 2'is connected to a cooling air inlet hole 13' provided in the rear cover 19.

The cooling air that has cooled the high-speed motors 21 and 22 in the casing 10 is recovered to the air intake unit 30 through the return flow path 4'. One end of the return passage (4') is connected to the cooling air discharge hole (16') provided in the casing (10) so that air cooled by the high-speed motors (21, 22) can be introduced, and the other end is connected to the front of the impeller (31). It is connected to the impeller housing 32 at the second position P2. The cooling air introduced through the second position P2 is supplied to the impeller 31 and discharged through the discharge pipe 50. In the return passage 4', a radiating part 5 having a radiating fin 6 is provided for cooling the cooling air heated in the casing 10.

A first space S1 is provided between the casing 10 and the rear bearing housing 12 communicating with the cooling air discharge hole 16 ′. A second space (S2) between the front bearing housing (11) and the stator (22), a third space (S3) between the rear bearing housing (12) and the stator (22), and the rear bearing housing (12) and rear cover (19) A fourth space S4 is provided between them. The fourth space S4 communicates with the cooling air inlet hole 13'.

The rear bearing housing 12 is provided with a through hole 15 connecting the third space S3 and the fourth space S4, and between the rotor 21 and the stator 22 from the third space S3. The cooling air introduced into the second space S2 through the gap G flows into the first space S1 through the cooling passage 23. The cooling air in the first space S1 flows into the return flow path 4'through the cooling air discharge hole 16'.

A slit 14 is provided between the rear bearing housing 12 or between the rear bearing housing 12 and the stator 22. The slit 14 connects the first space S1 and the third space S3 in a radial direction, and allows the cooling air to be smoothly circulated within the casing 10.

Fig. 8 schematically shows a turbo blower 1" according to another embodiment. A redundant description of the same and similar elements as in the previous embodiment will not be necessary.

Referring to Fig. 8, the turbo blower 1" has a structure in which impellers 31 are provided at the front and rear ends of the rotor 21, respectively. The front air intakes 30a and the rear are provided by two impellers 31. Since external air is sucked and blown from each of the air intake units 30b, this turbo blower 1" is suitable for large capacity and high power requirements.

Some of the external air (cooling air) sucked from at least one of the front air intake part 30a and the rear air intake part 30b allows cooling of the high-speed motors 21, 22: 20 through the bypass channel 2. It may be supplied to the inside of the casing 10 for. One end of the bypass channel 2 may be connected to the outer case 100 to directly communicate with the outside. As an example, one end of the bypass passage 2 may be provided on the top surface of the outer case 100.

The inside of the casing 10 is a first space (S1), a front bearing housing (11), and a stator (22) configured so that the introduced external air can be guided to the cooling passage (23) in the front by the rear bearing housing (12). The second space S2 between, the third space S3 between the rear bearing housing 12 and the stator 22, and the fourth space between the rear bearing housing 12 and the rear end wall 17 of the casing 10 It is divided into space S4. The rear of the first space S1 is closed by the structure of the rear bearing housing 12 or the casing 10.

The cooling air introduced into the casing 10 through the cooling air inlet hole 13 passes through the first space (S1), the second space (S2), the third space (S3), and the fourth space (S4). It flows into the return flow path 4 through the cooling air discharge hole 16 provided in (10). The cooling air flowing through the return passage 4 is branched and supplied to the impeller 31 through the second positions P2 and P2' of the front and rear air intakes 30a and 30b, respectively.

Meanwhile, in the same manner as in the example of Fig. 7, the cooling air circulation direction in the turbo blower 1" may be designed in a direction opposite to that of the example of Fig. 8. As an example, the cooling air inlet hole (in Fig. 8). 13) is redesigned as a cooling air discharge hole, and the cooling air discharge hole 16 in FIG. 8 may be redesigned as a cooling air inlet hole 13.

Examples have been described to help understand various aspects and features of the present invention. It should be noted that the elements described in the claims may be variously changed, modified, and replaced by equivalents without departing from the technical spirit of the invention. Elements constituting the present invention may be selectively combined, and embodiments not previously described may be presented by such a combination.

Reference numerals set forth in the following claims are only for helping to more easily and intuitively understand the claimed inventions or their constituents, and do not limit the scope of the claimed inventions.

1: Turbo blower 2: Bypass channel
3: sealing case 4: return euro
5: heat dissipation part 6: heat dissipation fin
10: casing 11, 12: bearing housing
13: cooling air inlet hole 16: cooling air outlet hole
21: rotor 22: stator
23: cooling channel 24: cooling fin
31: impeller 32: impeller housing
41,42: journal bearing 50: discharge pipe
60: wind valve 100: outer case

Claims (6)

It includes a turbo blower and an outer case 100 in which the turbo blower is installed, and an external air inlet 101 and an air filter 102 for filtering are provided in the outer case 100, and the turbo blower,
Casing 10;
A high-speed motor built into the casing 10 and having a rotor 21 and a stator 22, wherein the cooling passage 23 extends in a longitudinal direction along the outer peripheral surface of the stator 22;
An air intake part 30 including an impeller 31 connected to the front end of the rotor 21 and an impeller housing 32 surrounding the impeller 31;
One end is connected to the outer case 100 at a location separate from the inlet 101 so that external air is introduced, and the other end is a bypass pipe 2 connected to the cooling air inlet hole 13 provided in the casing 10;
One end is connected to the cooling air discharge hole 16 provided in the casing 10, the other end is a return pipe 2 connected to the impeller housing 32 in front of the impeller 31;
Front and rear bearing housings 11 and 12 disposed on both sides of the stator 22 of the high-speed motor and for supporting the rotor 21;
A first space S1 configured to allow external air introduced through the cooling air inlet hole 13 to be guided by the rear bearing housing 12 to the cooling passage 23 at the front;
The second space S2 between the front bearing housing 11 and the stator 22, and the air in the first space S1 flows into the second space S2 through the cooling flow path 23;
A third space (S3) between the rear bearing housing 12 and the stator 22; And
It is provided at the rear of the rear bearing housing 12 and includes a fourth space (S4) in communication with the cooling air discharge hole (16),
The rear bearing housing 12 includes a sleeve 12a surrounding the rotor 21, a support 12b extending radially outward from the sleeve 12a, and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. The outer wall (12c) is provided with the outer wall (12c) is spaced apart from the casing 10 so that the first space (S1) is provided between the casing 10 in the vicinity of the cooling air inlet hole (13), and A through hole 15 connecting the third space S3 and the fourth space S4 is provided in (12b),
Air introduced into the third space S3 from the second space S2 through the gap G between the rotor 21 and the stator 22 is discharged to the fourth space S4 through the through hole 15 High efficiency turbo blower device, characterized in that configured to be. It includes a turbo blower and an outer case 100 in which the turbo blower is installed, and an external air inlet 101 and an air filter 102 for filtering are provided in the outer case 100, and the turbo blower,
Casing 10;
A high-speed motor built into the casing 10 and having a rotor 21 and a stator 22, wherein the cooling passage 23 extends in the longitudinal direction along the outer peripheral surface of the stator 22 fixed to the casing 10;
An air intake part 30 including an impeller 31 connected to the front end of the rotor 21 and an impeller housing 32 surrounding the impeller 31;
One end is connected to the outer case 100 at a location separate from the inlet 101 so that external air is introduced, and the other end is a bypass pipe 2'connected to the cooling air inlet hole 13' provided in the casing 10;
One end is connected to the cooling air discharge hole 16 ′ provided in the casing 10 and the other end is a return pipe 4 ′ connected to the impeller housing 32 in front of the impeller 31;
Front and rear bearing housings 11 and 12 disposed on both sides of the stator 22 of the high-speed motor and for supporting the rotor 21;
A first space (S1) between the casing 10 and the rear bearing housing 12 communicating with the cooling air discharge hole 16';
A second space (S2) between the front bearing housing 11 and the stator 22;
A third space (S3) between the rear bearing housing 12 and the stator 22; And
It is provided at the rear of the rear bearing housing 12, and includes a fourth space (S4) in communication with the cooling air inlet hole (13'),
The rear bearing housing 12 includes a sleeve 12a surrounding the rotor 21, a support 12b extending radially outward from the sleeve 12a, and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. The outer wall (12c) is provided with the outer wall (12c) is spaced apart from the casing 10 so that the first space (S1) is provided between the casing 10 in the vicinity of the cooling air inlet hole (13), and A through hole 15 connecting the third space S3 and the fourth space S4 is provided in (12b),
Air introduced into the second space (S2) from the third space (S3) through the gap (G) between the rotor (21) and the stator (22) is discharged to the first space (S1) through the cooling passage (23) High efficiency turbo blower device, characterized in that configured to be. It includes a turbo blower and an outer case 100 in which the turbo blower is installed, and an external air inlet 101 and an air filter 102 for filtering are provided in the outer case 100, and the turbo blower,
Casing 10;
A high-speed motor built into the casing 10 and having a rotor 21 and a stator 22, wherein the cooling passage 23 extends in a longitudinal direction along the outer peripheral surface of the stator 22;
Each of the air intakes 30a and 30b provided at the front and rear ends of the rotor 21 and the air intakes 30a and 30b are each impeller 31 connected to the rotor 21 and an impeller surrounding the impeller 31 With a housing 32;
One end is connected to the outer case 100 at a location separate from the inlet 101 so that external air is introduced, and the other end is a bypass pipe 2 connected to the cooling air inlet hole 13 provided in the casing 10;
One end is connected to the cooling air discharge hole 16 provided in the casing 10 and the other end is a return pipe 4 connected to the impeller housing 32 in front of the impeller 31;
Front and rear bearing housings 11 and 12 disposed on both sides of the stator 22 of the high-speed motor and for supporting the rotor 21;
A first space S1 configured to allow external air introduced through the cooling air inlet hole 13 to be guided by the rear bearing housing 12 to the cooling passage 23 at the front;
The second space S2 between the front bearing housing 11 and the stator 22, and the air in the first space S1 flows into the second space S2 through the cooling flow path 23;
A third space (S3) between the rear bearing housing 12 and the stator 22; And
It is provided at the rear of the rear bearing housing 12 and includes a fourth space (S4) in communication with the cooling air discharge hole (16),
The rear bearing housing 12 includes a sleeve 12a surrounding the rotor 21, a support 12b extending radially outward from the sleeve 12a, and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. The outer wall (12c) is provided with the outer wall (12c) is spaced apart from the casing 10 so that the first space (S1) is provided between the casing 10 in the vicinity of the cooling air inlet hole (13), and A through hole 15 connecting the third space S3 and the fourth space S4 is provided in (12b),
Air introduced into the third space S3 from the second space S2 through the gap G between the rotor 21 and the stator 22 is discharged to the fourth space S4 through the through hole 15 High efficiency turbo blower device, characterized in that configured to be. The method according to any one of claims 1 to 3, wherein the first space (S1) and the third space (S3) are in radial communication with the rear bearing housing (12) or the rear bearing housing (12) and the stator (22). ) Between the slit 14 is provided, the slit 14 is a high-efficiency turbo blower device characterized in that the width is smaller than the through hole (15). delete delete

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