Single stage air float blower

Abstract

The application relates to the technical field of high-speed centrifugal blowers, and discloses a single-stage air-floating blower which comprises an outer shell body, an inner shell body, a first end cover, a second end cover, a third end cover, a fourth end cover, a stator, a rotor shaft, a thrust disc, a volute body, a gas compression impeller, a main fan, an auxiliary fan, a radial air-floating bearing and an axial air-floating bearing. The main fan is arranged to cool the stator, the rotor and the radial air-floating bearing, the auxiliary fan is arranged to cool the axial air-floating bearing, and after the auxiliary fan cools the axial air-floating bearing, the cooling gas in the channel can flow into the cooling channel of the main fan. Compared with the previous air-floating blower scheme, the cooling efficiency between the stator and the rotor is improved, and the air amount entering the axial air-floating bearing is increased by arranging the auxiliary fan.

Description

Technical Field

[0001] This invention relates to the field of high-speed centrifugal blower technology, specifically a single-stage air flotation blower. Background Technology

[0002] The air-suspended centrifugal blower is a brand-new concept blower. It adopts three core high-end technologies: ultra-high-speed direct-drive motor, air-suspended bearing, and high-precision single-stage centrifugal impeller. It has ushered in a new era of high-efficiency, high-performance, low-noise, and low-energy-consumption blowers. It is a new generation of high-tech civilian products developed with dedication based on aerospace turbomachinery design experience.

[0003] Existing air-suspended centrifugal blowers, when considering motor cooling design, often only consider the cooling of the motor stator and rotor, as well as the radial air bearing (Announcement No.: CN111917202A, Announcement Date: 20201110). Even if they do consider the cooling of the axial air bearing (Announcement No.: CN213574748U, Announcement Date: 20210629), the cooling air is a very small portion diverted from the gas cooling the stator and rotor, and the cooling direction is towards the side of the axial air bearing where friction is relatively less. The side furthest from the compressor impeller is the axial air bearing, resulting in relatively low cooling efficiency and a shorter lifespan. In fact, since most blowers are single-stage blowers, their axial force is unidirectional (generally from the fan to the impeller from the perspective of the whole machine). When the motor starts and stops, the dry friction heating phenomenon of the axial air bearing on one side (usually the side closer to the impeller) is more significant. Therefore, in order to effectively improve the service life of the axial air bearing and the working time of the whole machine, it is necessary to study how to improve the cooling efficiency of the axial air bearing. Summary of the Invention

[0004] The purpose of this invention is to provide a single-stage air flotation blower to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a single-stage air-float blower, comprising an outer shell body, an inner shell body, a first end cover, a second end cover, a third end cover, a fourth end cover, a stator, a rotor shaft, a thrust disc, a volute body, a compressor impeller, a main fan, an auxiliary fan, a radial air-float bearing, and an axial air-float bearing. The outer shell body is provided with a radial annular air inlet and a radial annular air outlet. The inner shell body is provided with a ventilation groove and a radial annular air outlet, and the radial annular air outlet on the inner shell body and the radial annular air outlet on the outer shell body are distributed correspondingly to each other. The first end cover is provided with a first axial cooling channel and a radial cooling channel. The second end cover is provided with a second axial cooling channel. The third end cover is provided with a third axial cooling channel. The fourth end cover is provided with an axial air inlet. The first axial cooling channel, the radial cooling channel, the second axial cooling channel, and the radial annular air inlet constitute a secondary cooling channel for the motor.

[0006] The axial air inlet, the third axial cooling channel, the ventilation slot, and the radial annular air outlets on the outer shell and the inner shell constitute the main cooling channel of the motor. The inner shell and the outer shell are interference-fitted. The second end cover and the third end cover are fixed to the left and right ends of the outer shell by screws, respectively. The first end cover is fixed to the left end of the second end cover by screws. The fourth end cover is fixed to the right end of the third end cover by screws. The stator is fixed to the inner wall of the inner shell by interference fit.

[0007] The thrust plate, compressor impeller, main fan and auxiliary fan are fixed to the rotor shaft by locking nuts. The rotor shaft is supported by radial air bearings fixed to the second end cover and the third end cover. The axial air bearings are fixed to the right end face of the first end cover and the left end face of the second end cover, which are parallel to the two sides of the thrust plate. The volute body is fixed to one end of the outer shell body by clamps. The volute body has a working medium inlet and a working medium outlet.

[0008] As a further improvement of the present invention, the first end cover is provided with a boss, and the boss has a first axial cooling channel for the motor secondary cooling channel, which is circular in shape. This first axial cooling channel is connected to the second axial cooling channel. The space between the two bosses is the air intake channel for the motor secondary cooling channel. The air intake channel for the motor secondary cooling channel corresponds one-to-one with the radial annular air intake on the outer shell body.

[0009] As a further improvement of the present invention, the first end cover is provided with a radial cooling channel in the shape of a circular hole. The axial position of the first end cover is the position of the auxiliary fan blades, which are distributed in a circumferential array and connected to the first axial cooling channel. The first end cover is provided with a labyrinth sealing structure in the area between the compressor impeller and the auxiliary fan.

[0010] As a further improvement of the present invention, the second axial cooling channel is in the shape of a circular hole, which corresponds one-to-one with the first axial cooling channel, and the first axial cooling channel is connected to the main cooling channel of the motor.

[0011] As a further improvement of the present invention, the third axial cooling channel of the third end cover is in the same radial position as the ventilation slot of the inner shell, and is in the shape of a circular hole, which is distributed in a circumferential array.

[0012] As a further improvement of the present invention, the axial air inlet of the fourth end cover is a circular hole, the central axis of the axial air inlet coincides with the central axis of the motor, and its size is the minimum inner diameter of the blades on the main fan.

[0013] As a further improvement of the present invention, the radial annular air inlet on the outer shell body is waist-shaped, distributed in a circumferential array, with the axial position being the axial position of the thrust disk and the circumferential position being the middle position of the two protrusions of the first end cover.

[0014] As a further improvement of the present invention, the radial annular air outlet on the inner shell body and the radial annular air outlet on the outer shell body are both circular in shape, and their axial positions are the axial positions of the stator right winding.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This single-stage air-bearing blower features two sets of fans: a main fan for cooling the stator, rotor, and radial air-bearing bearings, and an auxiliary fan for cooling the axial air-bearing bearings. After cooling the axial air-bearing bearings, the cooling gas from the auxiliary fan's channel flows back into the main fan's cooling channel. Compared to previous air-bearing blower designs, this not only enhances the cooling efficiency between the stator and rotor but also increases the air volume entering the axial air-bearing bearings by using an auxiliary fan, thus lowering the temperature of the cooling gas. This more effectively removes the heat generated by friction in the axial air-bearing bearings, further extending the bearing's service life and the overall machine's operating time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the first end cap structure in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the second end cap structure in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the third end cap structure in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the fourth end cap structure in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the outer shell and inner shell structure in an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the auxiliary fan structure in an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the main fan structure in an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the rotor shaft structure in an embodiment of the present invention.

[0027] Figure 10 This is an overall sectional view in an embodiment of the present invention.

[0028] Figure 11 This is a perspective view of the outer shell and inner shell in an embodiment of the present invention.

[0029] In the picture:

[0030] 100. Compressor impeller; 101. Volute casing; 103. First end cover; 104. Auxiliary fan; 106. Thrust disc; 107. Second end cover; 108. Axial air bearing; 109. Radial air bearing; 110. Rotor shaft; 111. Outer casing; 112. Inner casing; 113. Stator; 114. Main fan; 115. Third end cover; 116. Fourth end cover;

[0031] 10. Volute inlet; 11. Volute outlet; 12. Radial cooling channel; 13. Radial annular inlet; 14. First axial cooling channel; 15. Second axial cooling channel; 17. Ventilation slot; 18. Radial annular outlet; 19. Third axial cooling channel; 20. Axial inlet;

[0032] 1. Compressed air working process; 2. Motor secondary cooling channel; 3. Motor main cooling channel. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1 , Figure 10 This invention provides a single-stage air-float blower, comprising an outer shell body 111, an inner shell body 112, a first end cover 103, a second end cover 107, a third end cover 115, a fourth end cover 116, a stator 113, a rotor shaft 110, a thrust disc 106, a volute body 101, a compressor impeller 100, a main fan 114, an auxiliary fan 104, a radial air-float bearing 109, and an axial air-float bearing 108. The outer shell body 111 is provided with a radial annular air inlet 13 and a radial annular air outlet 18, and the inner shell body 112 is provided with a ventilation slot 17 and a radial annular air outlet. 18, and the radial annular air outlet 18 on the inner shell body 112 and the radial annular air outlet 18 on the outer shell body 111 are distributed correspondingly to each other. The first end cover 103 is provided with a first axial cooling channel 14 and a radial cooling channel 12. The second end cover 107 is provided with a second axial cooling channel 15. The third end cover 115 is provided with a third axial cooling channel 19. The fourth end cover 116 is provided with an axial air inlet 20. The first axial cooling channel 14, the radial cooling channel 12, the second axial cooling channel 15 and the radial annular air inlet 13 constitute the motor secondary cooling channel 2.

[0035] The axial air inlet 20, the third axial cooling channel 19, the ventilation slot 17, the outer shell body 111 and the radial annular air outlet 18 on the inner shell body 112 constitute the main cooling channel 3 of the motor. The inner shell body 112 and the outer shell body 111 are interference-fitted. The second end cover 107 and the third end cover 115 are fixed to the left and right ends of the outer shell body 111 by screws respectively. The first end cover 103 is fixed to the left end of the second end cover 107 by screws. The fourth end cover 116 is fixed to the right end of the third end cover 115 by screws. The stator 113 is fixed to the inner wall of the inner shell body 112 by interference fit.

[0036] The thrust plate 106, the compressor impeller 100, the main fan 114 and the auxiliary fan 104 are fixed to the rotor shaft 110 by locking nuts. The rotor shaft 110 is supported by radial air bearings 109 fixed on the second end cover 107 and the third end cover 115. The axial air bearings 108 are fixed on the right end face of the first end cover 103 and the left end face of the second end cover 107, which are parallel to the two sides of the thrust plate 106. The volute body 101 is fixed to one end of the outer shell body 111 by clamps. The volute body 101 has a volute inlet 10 and a volute outlet 11.

[0037] Reference Figure 1-2 The first end cap 103 is provided with a boss, and the boss has a first axial cooling channel 14 of the motor secondary cooling channel 2, which is a circular hole. This first axial cooling channel 14 is connected to the second axial cooling channel 15. The space between the two bosses is the air intake channel of the motor secondary cooling channel 2. The air intake channel of the motor secondary cooling channel 2 corresponds one-to-one with the radial annular air intake 13 on the outer shell body 111.

[0038] Reference Figure 1-3 The first end cover 103 is provided with a radial cooling channel 12, which is a circular hole. The axial position of the first end cover 103 is the position of the blades of the auxiliary fan 104, which are distributed in a circumferential array and are connected to the first axial cooling channel 14. The first end cover 103 is provided with a labyrinth sealing structure, which is located in the area between the compressor impeller 100 and the auxiliary fan 104.

[0039] Reference Figure 1 , Figure 2 and Figure 4 The second axial cooling channel 15 is a circular hole, which corresponds one-to-one with the first axial cooling channel 14. The first axial cooling channel 14 is connected to the main cooling channel 3 of the motor.

[0040] Reference Figure 1 and Figure 5 The third axial cooling channel 19 of the third end cover 115 is in the same radial position as the ventilation slot 17 of the inner shell, and is in the shape of a circular hole, which is distributed in a circumferential array.

[0041] Reference Figure 1 , Figure 11 and Figure 6 The axial air inlet 20 of the fourth end cover 116 is a circular hole. The central axis of the axial air inlet 20 coincides with the central axis of the motor and its size is the minimum inner diameter of the blades on the main fan 114.

[0042] Reference Figure 1 and Figure 7 The radial annular air inlet 13 on the outer shell body 111 is waist-shaped and distributed in a circumferential array. Its axial position is the axial position of the thrust disk 106, and its circumferential position is the middle position of the two protrusions of the first end cover 103.

[0043] Reference Figure 1 and Figure 7 The radial annular air outlet 18 on the inner shell body 112 and the radial annular air outlet 18 on the outer shell body 111 are both circular in shape, and their axial positions are the same as the axial positions of the right winding of the stator 113.

[0044] Reference Figure 1-9The working principle of a single-stage air flotation blower includes the air compression process 1 of the volute body 101 and the cooling process of the motor, the secondary cooling channel 2 and the main cooling channel 3 of the motor. The air compression process 1 of the volute body 101 refers to the working medium entering the air compressor 100 through the air inlet 10 of the volute, being pressurized by the air compressor 100, and then being discharged from the air outlet 11 of the volute.

[0045] The motor cooling process refers to the process where, under the action of two sets of fans, the main fan 114 and the auxiliary fan 104, cooling gas enters from the axial air inlet 20 of the fourth end cover 116 and the radial annular air inlet 13 of the outer shell, respectively. Then, the main cooling channel 3 and the secondary cooling channel 2 cool the stator 113, the rotor shaft 110, the radial air bearing 109, and the axial air bearing 108, respectively, and then the gas is discharged from the radial annular air outlet 18 on the inner shell body 112 and the outer shell body 111.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single-stage air-floating blower, comprising an outer shell body (111), an inner shell body (112), a first end cover (103), a second end cover (107), a third end cover (115), a fourth end cover (116), a stator (113), a rotor shaft (110), a thrust disc (106), a volute body (101), a compressor impeller (100), a main fan (114), an auxiliary fan (104), a radial air-floating bearing (109), and an axial air-floating bearing (108), characterized in that, The outer shell body (111) is provided with a radial annular air inlet (13) and a radial annular air outlet (18). The inner shell body (112) is provided with a ventilation groove (17) and a radial annular air outlet (18). The radial annular air outlet (18) on the inner shell body (112) and the radial annular air outlet (18) on the outer shell body (111) are distributed correspondingly to each other. The first end cover (103) is provided with a first axial cooling channel (14) and a radial cooling channel (12). The second end cover (107) is provided with a second axial cooling channel (15). The third end cover (115) is provided with a third axial cooling channel (19). The fourth end cover (116) is provided with an axial air inlet (20). The first axial cooling channel (14), the radial cooling channel (12), the second axial cooling channel (15) and the radial annular air inlet (13) constitute the motor secondary cooling channel (2). The axial air inlet (20), the third axial cooling channel (19), the ventilation slot (17), the outer shell body (111), and the radial annular air outlet (18) on the inner shell body (112) constitute the main cooling channel (3) of the motor. The inner shell body (112) and the outer shell body (111) are interference-fitted. The second end cover (107) and the third end cover (115) are fixed to the left and right ends of the outer shell body (111) respectively by screws. The first end cover (103) is fixed to the left end of the second end cover (107) by screws. The fourth end cover (116) is fixed to the right end of the third end cover (115) by screws. The stator (113) is fixed to the inner wall of the inner shell body (112) by interference fit. The thrust plate (106), the compressor impeller (100), the main fan (114) and the auxiliary fan (104) are fixed on the rotor shaft (110) by locking nuts. The rotor shaft (110) is supported by radial air bearings (109) fixed on the second end cover (107) and the third end cover (115). The axial air bearings (108) are fixed on the right end face of the first end cover (103) and the left end face of the second end cover (107) which are parallel to the two sides of the thrust plate (106). The volute body (101) is fixed to one end of the outer shell body (111) by clamps. The volute body (101) has a volute inlet (10) and a volute outlet (11).

2. The single-stage air flotation blower according to claim 1, characterized in that, The first end cap (103) is provided with a boss, and the boss has a first axial cooling channel (14) of the motor secondary cooling channel (2), which is a circular hole. This first axial cooling channel (14) is connected to the second axial cooling channel (15). The space between the two bosses is the air intake channel of the motor secondary cooling channel (2). The air intake channel of the motor secondary cooling channel (2) corresponds one-to-one with the radial annular air intake (13) on the outer shell body (111).

3. A single-stage air flotation blower according to claim 1, characterized in that, The first end cover (103) is provided with a radial cooling channel (12), which is a circular hole. The axial position of the first end cover (103) is the position of the blades of the auxiliary fan (104), which is distributed in a circumferential array and is connected to the first axial cooling channel (14). The first end cover (103) is provided with a labyrinth sealing structure, which is located in the area between the compressor impeller (100) and the auxiliary fan (104).

4. A single-stage air flotation blower according to claim 1, characterized in that, The second axial cooling channel (15) is a circular hole, which corresponds one-to-one with the first axial cooling channel (14). The first axial cooling channel (14) is connected to the main cooling channel (3) of the motor.

5. A single-stage air flotation blower according to claim 1, characterized in that, The third axial cooling channel (19) of the third end cover (115) is in the same radial position as the ventilation slot (17) of the inner shell, and is in the shape of a circular hole, which is distributed in a circumferential array.

6. A single-stage air flotation blower according to claim 1, characterized in that, The axial air inlet (20) of the fourth end cover (116) is a circular hole. The central axis of the axial air inlet (20) coincides with the central axis of the motor and its size is the minimum inner diameter of the blades on the main fan (114).

7. A single-stage air flotation blower according to claim 1, characterized in that, The radial annular air inlet (13) on the outer shell body (111) is waist-shaped and distributed in a circumferential array. Its axial position is the axial position of the thrust disk (106) and its circumferential position is the middle position of the two protrusions of the first end cover (103).

8. A single-stage air flotation blower according to claim 1, characterized in that, The radial annular air outlet (18) on the inner shell body (112) and the radial annular air outlet (18) on the outer shell body (111) are both circular in shape, and their axial positions are the axial positions of the right winding of the stator (113).

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