KR102353083B1 - Turboblower Having Superior Efficiency - Google Patents

Abstract

A turbo blower with excellent cooling performance of a high-speed motor is introduced. A part of intake air by the impeller is used to cool the high-speed motor, and this intake air is again supplied to the impeller to be compressed and blown. The intake air introduced into the casing is guided to move along the cooling passage of the stator by the rear bearing housing. The 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 the through hole provided in the rear bearing housing.

Description

High Efficiency Turbo Blower

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

Turboblowers using the rotational force of an impeller coupled to a high-speed motor are known. The 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 transfer of powders.

Recently, there is a high demand for high capacity and high efficiency in the field of turbo blowers. It is necessary to increase the speed and output of the turbo blower, and for this, the high-speed motor needs to be effectively cooled to operate with optimum efficiency. The cooling of a high-speed motor has an absolute effect on the output and lifespan of the motor.

A cooling fan is used to cool the high-speed motor. A cooling fan is installed at the rotor end on the opposite side of the impeller. The cooling fan rotates together with the rotor to blow cooling air toward 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 the efficiency of the high-speed motor.

The high-speed rotating rotor is supported by airfoil bearings or magnetic bearings that do not require lubrication. The air film built up between the airfoil bearing and the rotating rotor lifts the rotor so that it can rotate without friction or noise. The airfoil bearing includes a top foil that directly supports the rotor and a bump foil that exhibits substantial 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 with excellent motor cooling performance.

The problems to be solved in the present invention are not necessarily limited to the above-mentioned issues, and other problems that have not been mentioned will 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 along an outer circumferential surface of the stator in a longitudinal direction; an air intake unit having an impeller connected to the 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 passage connected to the cooling air inlet hole provided in the casing, and the first position is provided in the air intake unit or provided 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, the other end is a return flow path connected to the second position of the air intake, 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 to support the rotor; a first space configured to allow external air introduced through the cooling air inlet hole to be guided to the front cooling passage by the rear bearing housing; a second space between the front bearing housing and the stator, and air in the first space flows into the second space through the cooling passage; 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 communicating with the cooling air discharge hole, wherein the rear bearing housing has a through hole connecting the third space and the fourth space, from the second space The 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, the high-speed motor cooling performance and the efficiency of the turbo blower are improved because the high-speed motor is effectively cooled by using an impeller having superior air intake performance and efficiency instead of the low-efficiency cooling fan.

According to the present invention, since the cooling fan can be omitted, it is also possible to omit the parts necessary for mounting the cooling fan. Overall, the number of parts is reduced, making it possible to reduce the cost of parts, reduce assembly man-hours, and reduce weight. In addition, since the number of parts of the high-speed rotating rotor assembly is reduced, it is possible to prevent tolerance and precision degradation that may occur in the process of disassembling and assembling parts for maintenance, and to ensure high-speed rotation stability of the rotor.

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

In addition, according to the present invention, the circulation flow of the cooling air in the casing is very smooth. In particular, the flow of cooling air along the cooling passage 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 has excellent cooling performance, so that the efficiency of the high-speed motor can be optimally maintained, and it is possible to improve the output and extend the life of the high-speed motor.

1 is a schematic cross-sectional view of a turbo blower according to an embodiment of the present invention.
FIG. 2 shows the flow of motor cooling air when the turbo blower shown in FIG. 1 operates.
FIG. 3 is a schematic cross-sectional view taken along line 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.
5 is a view of the inside of the outer case shown in FIG. 4 as seen 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 given 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 specified, the second element being disposed '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. Allows a third element to be interposed between elements. Directional indications such as front and rear, left and right, or up and down are only 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 is shown.

Referring to FIG. 1 , the turbo blower 1 includes a casing 10 , high-speed motors 21 , 22 : 20 built into the casing 10 , and an air intake unit 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 at the rear end of the main body in a radial direction, and a cooling air outlet hole 16 is provided at a central portion 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 a bearing, for example, an airfoil bearing or a magnetic bearing. A gap G is provided between the rotor 21 and the stator 22 . The rotor 21 includes a magnet, and the stator 22 includes a coil 22a for rotating the rotor 21 . A cooling passage 23 extends in the longitudinal direction on the outer peripheral 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 axis of rotation of the rotor 21, are provided at the front and rear of the stator 22, respectively. . According to the embodiment, an airfoil journal bearing 41 , 42 is disposed between the bearing housings 11 , 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 the 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 and is 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 omitted.

A disk-shaped runner disk 24 extending in a 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 disc 24 , and the front bearing housing 11 is disposed at the rear of the runner disc 24 . A thrust airfoil bearing is 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 has a sleeve 12a surrounding the rotor 21 , a support 12b extending radially outwardly from the sleeve 12a and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. and 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 outer wall 12c and 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 including the cooling air inlet hole 13 and the rear cover 19 are sealed by the sealing case 3 .

A bypass passage 2 is connected to the sealing case 3, specifically, a bypass tube as shown in FIG. 1 . The bypass flow path 2 is a flow path for bypassing a part of the air sucked from the outside by the impeller 31 (hereinafter, 'cooling air') and introducing it into the casing 10 for cooling the high-speed motor 20 . One end of the bypass passage 2 is connected at the first position (P1, see 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 mounted.

The return passage 4, specifically, one end of the return tube is connected to the cooling air discharge hole 16 of the rear cover 19, as shown in FIG. The return flow path 4 is a flow path for returning the cooling air to the air intake unit 30 after cooling the high-speed motor 20 . The other end of the return flow path 4 is connected to the impeller housing 32 at the second position P2 of the air intake unit 30 , just in front of the impeller 31 according to this embodiment. The cooling air in the casing 10 flows into the impeller 31 through the return passage 4 by the 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 blown through the impeller 31 at high speed to the discharge pipe. The second position (P2) on the inflow of external air is located in the rear of the first position (P1), that is, close to the impeller (31).

2 shows a flow of cooling air for cooling the high-speed motor 20 when the turbo blower 1 is operated.

Referring to FIGS. 1 and 2 , the cooling air supplied to the first space S1 through the cooling air inlet hole 13 flows through the rear bearing housing 12 , more specifically, the front cooling flow path by the outer wall 12c. (23) is derived. The first space S1 and the cooling passage 23 are arranged on 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 another structure 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 , and 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) passes through the cooling passage (23), cools the stator (22), and then flows into the second space (S2). The cooling air in the second space S2 flows through the gap G between the rotor 21 and the stator 22 to cool the stator 22 and the rotor 21 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 then is recovered to the air intake unit (30) through the return passage (4).

A slit 14 is provided either on 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 means the gap between the slits 14 in the front-rear direction or the radial diameter of the through-hole 15 . Of course, the slit 14 is formed smaller than the first space S1 or the cooling passage 23 .

A very part of the cooling air flowing from the first space (S1) to the front cooling passage (23) may be introduced into the third space (S3) through the slit (14), and conversely, the cooling air in the third space (S3) A very part of it may be introduced 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 a third space S3 through the gap G. does not interfere with the flow of 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 is smoothly discharged into the fourth space S4 through the through hole 15 without being stagnant in the third space S3 . make it possible

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 through the return passage 4 . The cooling air introduced through the bypass passage 2 from the air intake 30 is supplied to the impeller 31 through the return passage 4 almost 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.

As shown in FIGS. 2 and 3 , the stator 22 includes a winding coil 22a and a cylindrical core 22b or a case member. Cooling fins 24 are arranged to be 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-rear direction. A space defined by the adjacent cooling fins 24 and the casing 10 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 a front-back direction, Y denotes a width direction, and Z denotes a vertical height direction.

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

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

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

The front end of the suction duct 33 is fixed to the first partition wall 111 dividing the first chamber S11 and the second chamber S12. The air introduced into the first chamber S11 through the air filter 102 is introduced into the suction 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 wind valve 60 is connected to the discharge pipe 50 . When the operation of the turbo blower 1 is not in a steady state, such as at the beginning of operation or during a 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 generate surge ( It prevents the entry of surge).

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

5 schematically shows the inside of the outer case 100 as seen from the front (X direction).

4 and 5 , one end of the bypass flow passage 2 is directly connected to the suction duct 33 or connected to the first partition wall 111 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 to the inside of the casing 10 through the bypass passage 2 for cooling the high-speed motor 20 . The other end of the bypass passage 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 partitioned 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 outside air is provided. The external air introduced through the inlet 105 cools the return flow path 4 , and flows into the first chamber S11 through a through hole (not shown) of the third bulkhead 113 to provide a 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 identical to and similar to those in the previous embodiment will not be duplicated.

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

One end of the bypass passage 2 may be connected to the outer case 100 so as to communicate directly with the outside. As shown in FIG. 6 , one end of the bypass passage 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 flow path (2) by the negative pressure in the turbo blower (1). The other end of the bypass passage 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, although depending on the design, is lower than atmospheric pressure by about 0.03 to 0.05 atm. As the cooling air does not require a large flow rate, it is possible to cool the inside of the casing 10 by introducing external air by this level of negative pressure. An air filter may be provided in the bypass passage 2 .

7 schematically shows a turbo blower 1' according to another embodiment. The cooling air circulation direction in the casing 10 is reversed in this turbo blower 1' as compared to the turbo blowers described above. It will not be necessary to repeat descriptions for 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 a part of the external air sucked into the air intake unit 30 (hereinafter, 'cooling air'). A bypass flow path (2') for One end of the bypass passage 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 is exposed to the outside. can be connected to The other end of the bypass passage 2 ′ is connected to the 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 passage 4 ′. One end of the return flow path 4 ′ is connected to a cooling air discharge hole 16 ′ provided in the casing 10 so that air cooled by the high-speed motors 21 and 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 in a 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 . A heat dissipation unit 5 having a heat dissipation fin 6 is provided in the return flow path 4 ′ for cooling the cooling air heated in the casing 10 .

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

A through hole 15 connecting the third space S3 and the fourth space S4 is provided in the rear bearing housing 12 , and is formed 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 to the return passage 4' through the cooling air discharge hole 16'.

A slit 14 is provided either in the rear bearing housing 12 or between the rear bearing housing 12 and the stator 22 . The slit 14 radially communicates the first space S1 and the third space S3 , and allows cooling air to circulate smoothly within the casing 10 .

Fig. 8 schematically shows a turbo blower 1" according to another embodiment. Duplicate descriptions 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 intake 30a and the rear by two impellers 31 Since external air is sucked in from each of the air intakes 30b and blown, this turbo blower 1" is suitable for large-capacity and high-output 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 cools the high-speed motors 21, 22: 20 through the bypass passage 2 It may be supplied into the casing 10 for this purpose. One end of the bypass passage 2 may be connected to the outer case 100 so as to communicate directly 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 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 front bearing housing 11 and the stator 22 a second space S2 between the third space S3 between the rear bearing housing 12 and the stator 22 and a fourth space between the rear bearing housing 12 and the rear end wall 17 of the casing 10 . It is divided into a 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 to the casing. The cooling air is introduced into the return flow path 4 through the cooling air discharge hole 16 provided in the 10 . The cooling air flowing through the return flow path 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.

On the other hand, 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 the opposite direction to the example of Fig. 8. As an example, in Fig. 8, the cooling air inlet hole ( 13) may be 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 above to help understand various aspects and features of the present invention. It should be borne in mind that elements described in the claims may be variously changed and modified and replaced with equivalents without departing from the 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.

The reference numerals described in the following claims are provided only to help understand the claimed inventions or their components more easily and intuitively, and do not limit the scope of the claimed inventions.

1: Turbo blower 2: Bypass flow path
3: Sealing case 4: Return flow path
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 passage 24: cooling fins
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 embedded in the casing 10 and having a rotor 21 and a stator 22, wherein the cooling passage 23 extends along an outer circumferential surface of the stator 22 in the longitudinal direction;
The air intake part 30 having the impeller 31 connected to the front end of the rotor 21 and the impeller housing 32 surrounding the impeller 31, and the external through the inlet 101 by the rotational force of the impeller 31 air introduced from the impeller 31 is supplied;
One end is disposed at the first position (P1), the other end is a bypass pipe (2) connected to the cooling air inlet hole (13) provided in the casing (10), and one end is provided in the air intake unit (30) or communicated with the outside. connected to the outer case 100;
One end is connected to the cooling air discharge hole 16 provided in the casing 10 so that the air cooled by the high-speed motor can be discharged, and the other end is the return pipe 4 connected to the second position P2 of the air intake unit 30 . ), the second position P2 is located closer to the impeller 31 than the first position P1, and the air introduced into the air intake 30 at the second position P2 is supplied to the impeller 31 and discharged through the discharge pipe 50;
It is disposed on both sides of the stator 22 of the high-speed motor and front and rear bearing housings 11 and 12 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 to the front cooling passage (23) by the rear bearing housing (12);
air in the second space S2 and the first space S1 between the front bearing housing 11 and the stator 22 is introduced into the second space S2 through the cooling passage 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),
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 into the fourth space S4 through the through hole 15 . configured to be
The rear bearing housing 12 has a sleeve 12a surrounding the rotor 21 , a support 12b extending radially outwardly from the sleeve 12a and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. has an outer wall 12c of A high-efficiency turbo blower device, characterized in that a through hole (15) connecting the third space (S3) and the fourth space (S4) is provided in (12b). 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 embedded in the casing 10 and having a rotor 21 and a stator 22, wherein the cooling passage 23 extends along the outer circumferential surface of the stator 22 fixed to the casing 10;
The air intake part 30 having the impeller 31 connected to the front end of the rotor 21 and the impeller housing 32 surrounding the impeller 31, and the external through the inlet 101 by the rotational force of the impeller 31 air introduced from the impeller 31 is supplied;
One end is disposed at the first position (P1), the other end is a bypass pipe (2') connected to the cooling air inlet hole (13') provided in the casing (10), and one end is provided in the air intake unit (30) or with the outside. connected to the outer case 100 to pass through;
One end of the return pipe ( 4 '), the second position (P2) is located closer to the impeller 31 than the first position (P1), and the air introduced into the air intake unit 30 from the second position (P2) is directed to the impeller (31). supplied and discharged through the discharge pipe 50;
It is disposed on both sides of the stator 22 of the high-speed motor and front and rear bearing housings 11 and 12 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'),
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 into the first space S1 through the cooling passage 23 . configured to be
The rear bearing housing 12 has a sleeve 12a surrounding the rotor 21 , a support 12b extending radially outwardly from the sleeve 12a and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. has an outer wall 12c of A high-efficiency turbo blower device, characterized in that a through hole (15) connecting the third space (S3) and the fourth space (S4) is provided in (12b). 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 embedded in the casing 10 and having a rotor 21 and a stator 22, wherein the cooling passage 23 extends along an outer circumferential surface of the stator 22 in the longitudinal direction;
Air intake portions 30a and 30b provided at the front and rear ends of the rotor 21, respectively, and the air intake portions 30a and 30b, respectively, are an impeller 31 connected to the rotor 21 and an impeller surrounding the impeller 31 having a housing (32);
One end is disposed at the first position (P1), the other end is a bypass pipe (2) connected to the cooling air inlet hole (13) provided in the casing (10), one end is at least any of the front and rear air intakes (30a, 30b) provided in one or connected to the outer case 100 to communicate with the outside;
One end is connected to the cooling air discharge hole 16 provided in the casing 10 so that the air cooled by the high-speed motor can be discharged, and the other end is at the second position (P2, P2') of each air intake unit 30a, 30b. The return pipe 4 connected to the second position (P2, P2') is located closer to the impeller 31 than the first position (P1), and the air intake part 30 at the second position (P2, P2') The air introduced into the is supplied to the impeller 31 and discharged through the discharge pipe 50;
It is disposed on both sides of the stator 22 of the high-speed motor and front and rear bearing housings 11 and 12 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 to the front cooling passage (23) by the rear bearing housing (12);
air in the second space S2 and the first space S1 between the front bearing housing 11 and the stator 22 is introduced into the second space S2 through the cooling passage 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),
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 into the fourth space S4 through the through hole 15 . structured to be
The rear bearing housing 12 has a sleeve 12a surrounding the rotor 21 , a support 12b extending radially outwardly from the sleeve 12a and a cylindrical shape extending in the longitudinal direction of the rotor 21 from the support 12b. has an outer wall 12c of A high-efficiency turbo blower device, characterized in that a through hole (15) connecting the third space (S3) and the fourth space (S4) is provided in (12b). 4. The rear bearing housing (12) or the rear bearing housing (12) and the stator (22) according to any one of the preceding claims, such that the first space (S1) and the third space (S3) communicate in a radial direction. ) A slit 14 is provided between the slits 14, and the slit 14 is a high-efficiency turbo blower device, characterized in that the width is smaller than the through hole 15. The method according to any one of claims 1 to 3, wherein the outer case (100) is a first chamber (S11) installed with a turbo blower, the second chamber (S12) and the first chamber (S11) on one side of the first chamber (S11) A third chamber (S13) on the other side is provided,
The impeller housing 32 is provided with a suction duct 33 extending toward the front,
The front end of the suction duct 33 is fixed to the first partition wall 111 between the first chamber S11 and the second chamber S12,
One end of the bypass pipe (2,2') is connected to the first partition wall (111), and the other end of the return pipe (4,4') is connected to the impeller housing 32 in front of the impeller 31. Turbo blower device. delete

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