CN116877465A

CN116877465A - Single-stage air-float blower

Info

Publication number: CN116877465A
Application number: CN202310992193.2A
Authority: CN
Inventors: 贺燕铭; 邵强; 应铭
Original assignee: Hunan Lupeng Power Technology Co ltd
Current assignee: Hunan Lupeng Power Technology Co ltd
Priority date: 2023-08-08
Filing date: 2023-08-08
Publication date: 2023-10-13

Abstract

The invention relates to the technical field of high-speed centrifugal blowers and discloses a single-stage air-float 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, an air-float impeller, a main fan, an auxiliary fan, a radial air-float bearing and an axial air-float bearing. Through setting up two sets of fans of main pair, wherein main fan is used for cooling stator and rotor and radial air bearing, and vice fan is used for cooling axial air bearing, and vice fan is after axial air bearing cools off, and the cooling gas of this passageway can converge the cooling channel of main fan again, so, compare in the air supporting air blower scheme in the past, not only strengthened the cooling efficiency between stator and rotor, through the mode that sets up vice fan in addition, increased the tolerance that gets into axial air bearing.

Description

Single-stage air-float blower

Technical Field

The invention relates to the technical field of high-speed centrifugal blowers, in particular to a single-stage air-float blower.

Background

The air suspension centrifugal blower is a new concept blower, adopts three core high-end technologies of an ultra-high speed direct-connected motor, an air suspension bearing and a high-precision single-stage centrifugal impeller, creates a new era of high-efficiency, high-performance, low-noise and low-energy-consumption blowers, and is a new generation of high-tech civil products which are developed with great attention by adopting the design experience of aviation turbine machinery.

When the existing air suspension centrifugal blower is considered in the motor cooling design, only the cooling of a motor stator, a motor rotor and a radial air bearing is often considered (bulletin number: CN111917202A, bulletin day: 20201110), or the cooling of an axial air bearing is also considered (bulletin number: CN213574748U, bulletin day: 20210629), but the cooling gas is a small part of the gas for cooling the stator and the rotor, and the cooling direction is the side of the axial air bearing with relatively light friction (namely the side far away from the air compressing impeller), so that the cooling efficiency of the axial air bearing is relatively low, and the service life of the axial air bearing is relatively short; in fact, because most blowers are single-stage blowers, the axial force direction of the blowers is unidirectional (from the perspective of the whole machine, the fans are generally directed to the impellers), and the phenomenon of dry friction heating of the axial air bearing (generally on the impeller side) on one side is more remarkable when the motor is started and stopped, so that research on how to improve the cooling efficiency of the axial air bearing is necessary for effectively prolonging the service life of the axial air bearing and prolonging the working time of the whole machine.

Disclosure of Invention

The invention aims to provide a single-stage air-floating air blower so as to solve the problems in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: the single-stage air-float blower 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, an air-compressing impeller, a main fan, an auxiliary fan, a radial air-float bearing and an axial air-float bearing, wherein a radial annular air inlet and a radial annular air outlet are formed in the outer shell body;

the axial air inlet, the third axial cooling channel, the ventilation groove, the outer shell body and the radial annular air outlet on the inner shell body form a main motor cooling channel, the inner shell body and the outer shell body are in interference fit, the second end cover and the third end cover are respectively fixed at the left end and the right end of the outer shell body through screws, the first end cover is fixed at the left end of the second end cover through screws, the fourth end cover is fixed at the right end of the third end cover through screws, and the stator is fixed on the inner wall of the inner shell body in an interference manner;

the thrust disk, the air compressing impeller, the main fan and the auxiliary fan are fixed on a rotor shaft through lock nuts, the rotor shaft is supported by radial air bearing fixed on the second end cover and the third end cover, the axial air bearing is fixed on 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 side faces of the thrust disk, the volute body is fixed at one end of the housing body through a clamp, and the volute body is provided with a working medium air inlet and a working medium air outlet.

As a further improvement of the invention, the first end cover is provided with a boss, the boss is provided with a first axial cooling channel of the motor sub-cooling channel, the shape of the boss is a circular hole, the first axial cooling channel is communicated with a second axial cooling channel, the space between the two bosses is an air inlet channel of the motor sub-cooling channel, and the air inlet channels of the motor sub-cooling channels are in one-to-one correspondence with radial annular air inlets on the shell body.

As a further improvement of the invention, the first end cover is provided with radial cooling channels, the shape of the first end cover is a circular hole, the axial positions of the first end cover are the positions of the auxiliary fan blades and are distributed in a circumferential array and communicated with the first axial cooling channels, and the first end cover is provided with a labyrinth sealing structure, and the positions of the first end cover are the areas between the air compressing impeller and the auxiliary fan.

As a further improvement of the invention, the second axial cooling channels are circular holes, and are in one-to-one correspondence with the first axial cooling channels, and the first axial cooling channels are communicated with the main cooling channels of the motor.

As a further improvement of the invention, the third axial cooling channels of the third end cover are in the shape of circular holes distributed in a circumferential array and are consistent with the radial positions of the ventilation grooves of the inner shell.

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

As a further improvement of the invention, the radial annular air inlets on the shell body are in a waist shape, distributed in a circumferential array, the axial positions are the axial positions of the thrust disc, and the circumferential positions are the intermediate positions of the two bosses of the first end cover.

As a further improvement of the 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 the axial position is the axial position of the right winding of the stator.

Compared with the prior art, the invention has the beneficial effects that:

this single-stage air supporting air blower through setting up two sets of fans of main and auxiliary, wherein main fan is used for cooling stator and rotor and radial air bearing, and auxiliary fan is used for cooling axial air bearing, and auxiliary fan is after axial air bearing cools off, the cooling gas of this passageway can converge the cooling channel of main fan again, in this way, compare in the air supporting air blower scheme in the past, cooling efficiency between stator and rotor has not only been strengthened, and through the mode that sets up auxiliary fan, the tolerance that has got into axial air bearing has been increaseed, the temperature of cooling gas has been reduced, thereby more effectively take away the heat that air supporting axial bearing friction produced, the life of bearing and the operating time of complete machine have further been promoted.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the overall structure in an embodiment of the present invention.

Fig. 2 is a schematic view of a first end cap according to an embodiment of the invention.

Fig. 3 is a schematic structural diagram of a second end cap according to an embodiment of the present invention.

Fig. 4 is a schematic view of a third end cap structure according to an embodiment of the invention.

Fig. 5 is a schematic view of a fourth end cap according to an embodiment of the invention.

Fig. 6 is a schematic view of the outer shell and the inner shell according to an embodiment of the present invention.

Fig. 7 is a schematic view of a secondary fan according to an embodiment of the invention.

Fig. 8 is a schematic diagram of a main fan structure according to an embodiment of the invention.

Fig. 9 is a schematic view of a rotor shaft according to an embodiment of the present invention.

Fig. 10 is an overall cross-sectional view of an embodiment of the present invention.

Fig. 11 is a perspective view of an outer shell and an inner shell according to an embodiment of the present invention.

In the figure:

100. a gas-compressing impeller; 101. a volute body; 103. a first end cap; 104. a sub-fan; 106. a thrust plate; 107. a second end cap; 108. an axial air bearing; 109. a radial air bearing; 110. a rotor shaft; 111. a housing body; 112. an inner housing body; 113. a stator; 114. a main fan; 115. a third end cap; 116. a fourth end cap;

10. a volute inlet; 11. a volute air outlet; 12. radial cooling channels; 13. a radial annular air inlet; 14. a first axial cooling passage; 15. a second axial cooling passage; 17. a ventilation groove; 18. a radial annular air outlet; 19. a third axial cooling passage; 20. an axial air inlet;

1. a compressed air working process; 2. a motor sub-cooling passage; 3. and a main cooling channel of the motor.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 and 10, the present invention provides a single-stage air-floating blower, which includes an outer casing body 111, an inner casing 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 disk 106, a volute body 101, an air-compressing impeller 100, a main fan 114, a secondary fan 104, a radial air-floating bearing 109, and an axial air-floating bearing 108, wherein the outer casing body 111 is provided with a radial annular air inlet 13 and a radial annular air outlet 18, the inner casing body 112 is provided with a ventilation slot 17 and a radial annular air outlet 18, the radial annular air outlet 18 on the inner casing body 112 and the radial annular air outlet 18 on the outer casing body 111 are correspondingly distributed, 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, and the first axial cooling channel 14, the radial cooling channel 12, the second axial cooling channel 15 and the radial annular air inlet 13 form a motor sub-cooling channel 2;

the axial air inlet 20, the third axial cooling channel 19, the ventilation groove 17, the outer shell body 111 and the radial annular air outlet 18 on the inner shell body 112 form a motor main cooling channel 3, the inner shell body 112 and the outer shell body 111 are in interference fit, the second end cover 107 and the third end cover 115 are respectively fixed at the left end and the right end of the outer shell body 111 through screws, the first end cover 103 is fixed at the left end of the second end cover 107 through screws, the fourth end cover 116 is fixed at the right end of the third end cover 115 through screws, and the stator 113 is fixed on the inner wall of the inner shell body 112 through interference;

the thrust disc 106, the air compressing impeller 100, the main fan 114 and the auxiliary fan 104 are fixed on the rotor shaft 110 through lock nuts, the rotor shaft 110 is supported by radial air bearing 109 fixed on the second end cover 107 and the third end cover 115, the axial air bearing 108 is 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 side faces of the thrust disc 106, the volute body 101 is fixed on one end of the housing body 111 through a clamp, and the volute body 101 is provided with a volute air inlet 10 and a volute air outlet 11.

Referring to fig. 1-2, the first end cover 103 is provided with a boss, the boss is provided with a first axial cooling channel 14 of the motor sub cooling channel 2, the first axial cooling channel 14 is in a circular hole, the first axial cooling channel 14 is communicated with a second axial cooling channel 15, a space between the two bosses is an air inlet channel of the motor sub cooling channel 2, and the air inlet channels of the motor sub cooling channels 2 are in one-to-one correspondence with radial annular air inlets 13 on the housing body 111.

Referring to fig. 1-3, the first end cover 103 is provided with radial cooling channels 12 in the shape of circular holes, the axial positions of the first end cover 103 are the positions where the blades of the auxiliary fan 104 are located, and are distributed in a circumferential array, and are communicated with the first axial cooling channels 14, and the first end cover 103 is provided with a labyrinth seal structure, and the positions are the areas between the air compressing impeller 100 and the auxiliary fan 104.

Referring to fig. 1, 2 and 4, the second axial cooling passages 15 are circular holes in shape, and are in one-to-one correspondence with the first axial cooling passages 14, and the first axial cooling passages 14 communicate with the motor main cooling passage 3.

Referring to fig. 1 and 5, the third axial cooling passages 19 of the third end cap 115, which are in line with the radial positions of the ventilation slots 17 of the inner casing, are in the shape of circular holes distributed in a circumferential array.

Referring to fig. 1, 11 and 6, the axial air inlet 20 of the fourth end cap 116 is in the shape of a circular hole, and the central axis of the axial air inlet 20 coincides with the central axis of the motor and is the minimum inner diameter of the blades on the main fan 114.

Referring to fig. 1 and 7, the radial annular air inlets 13 on the housing body 111 are in a waist shape, distributed in a circumferential array, and located at axial positions of the thrust disk 106, and located at intermediate positions of two bosses of the first end cover 103.

Referring to fig. 1 and 7, the radial annular air outlet 18 on the inner housing body 112 and the radial annular air outlet 18 on the outer housing body 111 are both circular in shape, and the axial position is the axial position where the right winding of the stator 113 is located.

Referring to fig. 1 to 9, a working principle of a single-stage air-float blower includes an air-compressing working process 1 of a volute body 101, a motor secondary cooling channel 2 and a motor main cooling channel 3 in a cooling process of a motor, wherein the air-compressing working process 1 of the volute body 101 refers to that working medium enters an air-compressing impeller 100 through a volute air inlet 10, and is discharged from a volute air outlet 11 after the pressure of the working medium is increased by the air-compressing impeller 100;

the motor secondary cooling channel 2 and the motor primary cooling channel 3 in the cooling process of the motor mean that under the action of two groups of fans of the primary fan 114 and the secondary fan 104, cooling gas respectively enters from the fourth end cover 116 axial air inlet 20 and the outer shell radial annular air inlet 13, then respectively cools the stator 113, the rotor shaft 110, the radial air bearing 109 and the axial air bearing 108 through the motor primary cooling channel 3 and the motor secondary cooling channel 2, and then is discharged from the radial annular air outlets 18 on the inner shell body 112 and the outer shell body 111.

Although embodiments of the present 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 therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a single-stage air supporting air blower, includes shell body (111), inner shell body (112), first end cover (103), second end cover (107), third end cover (115), fourth end cover (116), stator (113), rotor shaft (110), thrust disk (106), spiral case body (101), impeller (100), main fan (114), auxiliary fan (104), radial air bearing (109), axial air bearing (108), characterized in that, be equipped with radial annular air inlet (13) and radial annular air outlet (18) on shell body (111), ventilation groove (17) and radial annular air outlet (18) have been seted up on inner shell body (112), and radial annular air outlet (18) on inner shell body (112) and shell body (111) correspond each other and distribute, first axial cooling passageway (14) and radial cooling passageway (12) have been seted up to first end cover (103), second axial cooling passageway (15) have been seted up to second end cover (107), third end cover (115) have been seted up third axial cooling passageway (19), fourth axial cooling passageway (19), axial cooling passageway (20) have been seted up to axial annular air outlet (18) on inner shell body (112) The second axial cooling channel (15) and the radial annular air inlet (13) form a motor sub-cooling channel (2);

the motor comprises an axial air inlet (20), a third axial cooling channel (19), a ventilation groove (17), an outer shell body (111) and a radial annular air outlet (18) on an inner shell body (112), wherein the inner shell body (112) and the outer shell body (111) form an interference fit, a second end cover (107) and a third end cover (115) are respectively fixed at the left end and the right end of the outer shell body (111) through screws, a first end cover (103) is fixed at the left end of the second end cover (107) through screws, a fourth end cover (116) is fixed at the right end of the third end cover (115) through screws, and a stator (113) is fixed on the inner wall of the inner shell body (112) through interference;

thrust dish (106), impeller (100), main fan (114) and vice fan (104) are fixed on rotor shaft (110) through lock nut, rotor shaft (110) are supported by radial air bearing (109) fixed on second end cover (107) and third end cover (115), axial air bearing (108) are fixed on first end cover (103) right-hand member face and second end cover (107) left end face parallel with thrust dish (106) both sides face, spiral case body (101) are fixed in the one end of shell body (111) through the clamp, spiral case air inlet (10) and spiral case gas outlet (11) have been seted up to spiral case body (101).

2. A single-stage air-floating air blower according to claim 1, characterized in that the first end cover (103) is provided with a boss, the boss is provided with a first axial cooling channel (14) of the motor sub-cooling channel (2), the boss is in the shape of a circular hole, the first axial cooling channel (14) is communicated with a second axial cooling channel (15), the space between the two bosses is an air inlet channel of the motor sub-cooling channel (2), and the air inlet channels of the motor sub-cooling channels (2) are in one-to-one correspondence with radial annular air inlets (13) on the housing body (111).

3. A single-stage air-floating air blower according to claim 1, characterized in that the first end cover (103) is provided with radial cooling channels (12) in the shape of circular holes, the axial position of the first end cover (103) is the position of the blades of the auxiliary fan (104), the first end cover is distributed in a circumferential array and is communicated with the first axial cooling channels (14), and the first end cover (103) is provided with a labyrinth sealing structure in the region between the air-compressing impeller (100) and the auxiliary fan (104).

4. A single stage air bearing blower according to claim 1, characterized in that the second axial cooling channels (15) are circular holes in shape, which are in one-to-one correspondence with the first axial cooling channels (14), the first axial cooling channels (14) being in communication with the main motor cooling channels (3).

5. A single stage air bearing wind turbine as claimed in claim 1 wherein the third axial cooling channels (19) of the third end cap (115) are of circular shape distributed in a circumferential array in correspondence with the radial position of the ventilation slots (17) of the inner shell.

6. A single stage air bearing blower as claimed in claim 1 wherein the axial inlet (20) of the fourth end cap (116) is in the form of a circular aperture, the central axis of the axial inlet (20) coincides with the central axis of the motor and is of a size which is the smallest internal diameter of the blades on the main fan (114).

7. A single-stage air-floating wind blower according to claim 1, characterized in that the radial annular air inlet (13) on the housing body (111) is in a waist shape, distributed in a circumferential array, the axial position is the axial position of the thrust disc (106), and the circumferential position is the middle position of two bosses of the first end cover (103).

8. A single-stage air-floating wind 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 the axial position is the axial position of the right winding of the stator (113).