CN221305684U - Centrifugal high-speed air compressor - Google Patents

Abstract

The utility model provides a centrifugal high-speed air compressor, in particular to the technical field of air compressors, which comprises a high-speed motor and a compression assembly connected with a motor shaft of the high-speed motor; the compression assembly comprises an impeller and a shell, wherein an air suction port and an air exhaust port are formed in the shell, and an air inlet and an air outlet are formed in the motor shell; when the impeller on the compression assembly rotates at a high speed along with the motor shaft of the high-speed motor, a first air flow which is discharged from the air outlet through air inlet is formed in the shell of the compression assembly, and a second air flow which is discharged from the air outlet through air inlet air after air is taken in from the air inlet and flows into the motor shell through the air inlet, and carries heat generated in the operation of the motor assembly. The centrifugal high-speed air compressor ensures that compressed gas is generated during normal operation, simultaneously introduces part of the compressed gas into the motor shell, and conducts out heat generated during operation of the motor assembly, so that the aim of heat dissipation of the high-speed motor is fulfilled.

Description

Centrifugal high-speed air compressor

Technical Field

The utility model relates to the technical field of air compressors, in particular to a centrifugal high-speed air compressor.

Background

The air compressor is a device for converting mechanical energy into gas pressure energy, and when the air compressor works, a large amount of heat can be generated due to the high rotating speed of a motor of the air compressor, if the heat is not timely dissipated, the motor is damaged, and the air compressor cannot normally operate, so that a heat dissipation device is needed to cool the air compressor.

At present, the air compressor adopts a mode of adding water cooling on the motor shell to dissipate heat, a set of water cooling circulation device is needed to be added in a water cooling mode, the overall structural design and the processing are complex, a motor heat source mainly generates an air gap between the rotor and the stator, and the water cooling mode is difficult to take away heat between the air gaps.

Disclosure of utility model

Therefore, the utility model mainly solves the technical problem of providing the centrifugal high-speed air compressor which has simple structure and good heat dissipation effect.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

A centrifugal high-speed air compressor comprises a high-speed motor and a compression assembly connected with a motor shaft of the high-speed motor;

The compression assembly comprises an impeller which is arranged around the motor shaft and rotates along with the motor shaft, and a shell for accommodating the impeller; the shell is provided with an air suction port and an air exhaust port which are used for communicating the accommodating space in the shell with the outside;

The high-speed motor comprises a motor shell and a motor assembly arranged in the motor shell, wherein the motor shell is provided with an air inlet communicated with the accommodating space in the shell and an air outlet communicated with the outside;

In the working process of the high-speed motor, the impeller rotates along with the motor shaft to generate negative pressure in the shell of the compression assembly, so that a first air flow discharged from the air outlet after air is taken in from the air suction port and a second air flow flowing into the motor shell through the air inlet after air is taken in from the air suction port, wherein the second air flow carries heat generated in the working of the motor assembly and is discharged through the air outlet are formed in the accommodating space.

Further, the side walls of the two opposite sides of the motor shell are respectively provided with a shaft hole for the motor shaft to pass through, and the motor shaft comprises a first connecting part and a second connecting part which are respectively arranged in the shaft holes in a penetrating way and extend to form;

The first connecting portion and the second connecting portion are respectively connected with the compression assembly.

Further, an air bearing is arranged at the position corresponding to the motor shaft and the shaft hole, and the motor shaft penetrates through the air bearing;

When the motor shaft rotates at a high speed, a high-pressure gas film which enables the side walls of the motor shaft on two opposite sides of the motor shell to be in a suspension state is formed between the air bearing and the motor shaft.

Further, the ends of the first connecting portion and the second connecting portion are respectively provided with a threaded portion, and the compression assembly is connected with the first connecting portion and the second connecting portion respectively and then is connected with the threaded portion in a fastening mode through nuts in a threaded mode.

Further, the impeller comprises an impeller shaft sleeved on the motor shaft and a plurality of blades radially extending from the periphery of the impeller shaft, and a gas flow passage is formed between two adjacent blades.

Further, the impeller further comprises an impeller plate protruding outwardly from the outer peripheral surface of the impeller shaft, each of the blades comprising a wide blade end connected to the impeller plate and a narrow blade end connected to the outer peripheral surface of the impeller shaft;

The blades are arranged in a tapered and inclined manner along the axial direction of the impeller shaft from the wide blade end to the narrow blade end, and the wide blade end comprises an end face flush with the impeller disc.

Further, the motor shell comprises a middle shell, a first end cover and a second end cover, wherein the first end cover and the second end cover are matched with the middle shell, a containing cavity for containing the stator and the rotor is formed in the middle shell, and the first end cover and the second end cover are covered at two ends of the middle shell;

The shaft holes are respectively formed at the central positions of the first end cover and the second end cover;

the air inlets are formed on the first end cover and the second end cover, respectively.

Further, the motor assembly comprises a motor stator and a motor rotor, and the motor rotor and the motor stator are coaxially and sequentially arranged on the outer side of the motor shaft;

The motor stator comprises a stator core and stator windings, wherein the stator windings comprise a plurality of winding units which are equidistantly wound around the periphery of the stator core, and gaps for leading out heat generated in the operation of the motor assembly are formed at the end parts of adjacent winding units.

Further, the stator core has a plurality of semi-closed slot penetrating along its axial direction, the opening of a plurality of semi-closed slot along its axial direction is abutted on the periphery of the motor rotor, the end of the semi-closed slot communicates with the gap formed at the end of the adjacent winding unit.

Further, the shell is in a horn shape and comprises a large-mouth end, a small-mouth end and a middle section;

The large opening end is connected with the side wall of the motor shell, the air suction opening is arranged at the small opening end, and the air exhaust opening is arranged at the position, close to the large opening end, of the middle section.

Compared with the prior art, the centrifugal high-speed air compressor provided by the embodiment at least has the following technical effects:

Through connect compression subassembly on the motor shaft of high-speed motor, set up induction port and gas vent on compression subassembly's casing, set up simultaneously on the motor casing with the air inlet and the gas outlet of the accommodation space intercommunication in the compression subassembly casing, when the impeller on the compression subassembly follows the motor shaft high-speed rotation of high-speed motor, make in compression subassembly's the casing form from the induction port by the first air current of gas outlet exhaust, simultaneously formed from the induction port after admitting air through the air inlet flow direction motor casing, carry the heat that produces in the motor subassembly work and through the exhaust second air current of gas outlet, this centrifugal high-speed air compressor machine is guaranteeing that normal work produces compressed gas, in compromise to introduce the motor casing with partial compressed gas, derive the heat that produces the motor subassembly during operation, reach high-speed motor radiating purpose.

And compared with a water-cooling heat dissipation mode, the centrifugal high-speed air compressor provided by the utility model has the advantages that the whole structure is simple, the processing is easy, and the air gap heat between the motor rotor and the motor stator can be carried out from the motor shell better.

Drawings

FIG. 1 is an overall block diagram of a centrifugal high-speed air compressor in an embodiment;

fig. 2 is an exploded view of the centrifugal high-speed air compressor of fig. 1;

FIG. 3 is a schematic diagram of an exploded structure of a high-speed motor according to an embodiment;

Fig. 4 is a schematic view of an internal structure of the centrifugal high-speed air compressor shown in fig. 1;

fig. 5 is a front view of the centrifugal high-speed air compressor shown in fig. 4;

FIG. 6 is a schematic view of an impeller in an embodiment.

Reference numerals illustrate:

100. A high-speed motor;

110. A motor housing; 111. an air inlet; 112. an air outlet; 113. an intermediate housing; 114. a first end cap; 115. a second end cap; 116. a shaft hole; 121. a motor stator; 1211. a stator winding; 122. a motor rotor; 1231. a first connection portion; 1232. a second connecting portion; 1233. a nut;

200. A compression assembly;

210. An impeller; 211. an impeller shaft; 212. a blade; 2121. a wide leaf end; 2122. a narrow leaf end; 213. an impeller disc; 220. a housing; 221. an air suction port; 222. an exhaust port; 230. a first compression assembly; 240. a second compression assembly;

300. an air bearing.

Detailed Description

The technical scheme of the utility model is further elaborated below by referring to the drawings in the specification and the specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. In the following description, reference is made to the expression "some embodiments" which describe a subset of all possible embodiments, but it should be understood that "some embodiments" may be the same subset or a different subset of all possible embodiments and may be combined with each other without conflict.

It will be further understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Referring to fig. 1 to 5, an embodiment of the present application provides a centrifugal high-speed air compressor, which includes a high-speed motor 100 and a compression assembly 200 connected to a motor shaft of the high-speed motor 100, wherein the compression assembly 200 includes an impeller 210 disposed around the motor shaft and rotating with the motor shaft, a housing 220 for accommodating the impeller 210 therein, and a diffuser for pressurizing gas; the case 220 is formed with an air inlet 221 and an air outlet 222 for communicating the accommodating space in the case 220 with the outside; the high-speed motor 100 comprises a motor housing 110 and a motor assembly arranged in the motor housing 110, wherein the motor housing 110 is provided with an air inlet 111 communicated with a containing space in a housing 220 and an air outlet 112 communicated with the outside; during the operation of the high-speed motor 100, the impeller 210 rotates along with the motor shaft to generate a negative pressure in the housing 220 of the compression assembly 200, so that a first air flow, which is discharged from the air outlet 222 after being introduced from the air inlet 221, and a second air flow, which is discharged from the air outlet 112 after being introduced from the air inlet 221, are formed in the accommodating space, and then flows into the motor housing 110 through the air inlet 111, carrying heat generated during the operation of the motor assembly.

During the operation of the high-speed motor 100, the impeller 210 rotates along with the motor shaft to generate a negative pressure in the housing 220, so that external air is sucked into the housing 220 from the air inlet 221, under the high-speed rotation of the impeller 210, the sucked air can be continuously discharged from the air outlet 222, so that the continuous flow of the air in the housing 220 is maintained, during the process, the high-speed rotation of the impeller 210 can apply work to the sucked air to enable the sucked air to obtain energy, and then under the action of the diffuser, the sucked air can be pressurized, so as to produce compressed air, wherein part of the compressed air is discharged from the air outlet 222, part of the compressed air flows into the motor housing 110 from the air inlet 111, and carries heat generated during the operation of the motor assembly and is discharged through the air outlet 112.

In another embodiment, the side walls of the opposite sides of the motor housing 110 are respectively provided with a shaft hole 116 through which a motor shaft passes, and the motor shaft includes a first connecting portion 1231 and a second connecting portion 1232 respectively formed by extending through the shaft holes 116; the first connecting portion 1231 and the second connecting portion 1232 are respectively connected with the compression assembly 200, that is, the two sides of the motor housing 110 are respectively provided with the compression assembly 200, specifically, the first compression assembly 230 and the second compression assembly 240, compared with the single side of the motor housing 110 provided with the compression assembly 200, the double side provided with the compression assembly 200 can effectively improve the working efficiency of the air compressor for generating compressed air on the one hand, on the other hand, the compressed air enters from the two opposite sides of the motor housing 110, the entering amount of the compressed air is increased, so that heat in the motor housing 110 and between gaps of the motor assemblies is carried by the compressed air to be discharged from the air outlet 112, and the air cooling effect of the motor assemblies is improved.

It should be noted that, the air bearing 300 is disposed at the position corresponding to the shaft hole 116 and the motor shaft penetrates through the air bearing 300, when the motor shaft rotates at high speed, a high-pressure air film is formed between the air bearing 300 and the motor shaft, so that the side walls of the motor shaft opposite to the motor housing 110 are in a suspension state, the purpose that the motor shaft is not contacted with the two opposite side walls of the motor housing 110 is achieved as far as possible, more compressed air enters the motor housing 110, heat in the motor housing 110 and between the motor assembly gaps is effectively carried away, and the heat dissipation purpose is achieved. Compared with the arrangement of the sliding bearing or the rolling bearing at the corresponding position of the motor shaft and the shaft hole 116, the sliding bearing or the rolling bearing generates heat along with a large amount of friction in the use process, the friction is reduced through oil lubrication to dissipate heat, the compressed gas is polluted by the oil in the process and is unfavorable for entering the inside of the motor shell 110, the air bearing 300 does not need oil lubrication, so that more compressed gas enters the inside of the motor shell 110, the friction between the compressed gas and the motor shaft is reduced in the use process, the heat generation is reduced, the compressed air is not polluted, and the heat dissipation effect of the high-speed motor 100 is improved.

In addition, compared with the prior art using the sliding bearing and the rolling bearing, the application range of the rotating speed of the air bearing 300 is wider, and the sliding bearing and the rolling bearing can not be normally used because the sliding bearing and the rolling bearing have obvious limitation on the rotating speed of the high-speed motor 100, especially more than 5 to 8 ten thousand per minute.

When the high-speed motor 100 starts to rotate, that is, the rotation speed of the high-speed motor 100 starts to accelerate from zero, a high-pressure gas film which enables the motor shaft to be in a suspension state relative to the side walls of the opposite sides of the motor housing 110 cannot be formed between the air bearing 300 and the motor shaft, and the air bearing 300 in this state has the function of supporting the motor shaft and assisting the acceleration of the high-speed motor 100 by reducing the friction between the motor shaft and the contact part of the motor housing 110.

Further, the exhaust port 222 is provided with a regulating valve, the regulating valve can regulate the size of the exhaust port 222, the load of the air bearing 300 can be changed by regulating the size of the exhaust port 222, so as to better ensure the cooling effect on the inside of the motor housing 110 and the gaps between motor components of the motor housing when the high-speed motor 100 rotates at different speeds, for example, if the rotating speed of the high-speed motor 100 is lower, the size of the exhaust port 222 can be reduced, so that the air pressure between the motor shaft and the side walls on two opposite sides of the motor housing 110 can be increased, and a high-pressure air film which enables the motor shaft to be in a suspension state relative to the side walls on two opposite sides of the motor housing 110 is formed between the air bearing 300 and the motor shaft, so that the purpose that the motor shaft is not contacted with the two opposite side walls of the motor housing 110 is achieved as far as possible. Illustratively, if the rotational speed of the high-speed motor 100 is high, the size of the exhaust port 222 may be increased, thereby avoiding excessive work of the compression assembly 200 and saving energy while ensuring that a high-pressure gas film is formed between the air bearing 300 and the motor shaft such that the motor shaft is in a suspended state with respect to the sidewalls of the opposite sides of the motor housing 110.

Optionally, the ends of the first and second connection parts 1231 and 1232 are provided with screw parts, respectively, and the compression assembly 200 is fastened and connected with the screw parts by screw nuts 1233 after being connected with the first and second connection parts 1231 and 1232, respectively.

Referring to fig. 6, the impeller 210 includes an impeller shaft 211 sleeved on the motor shaft and a plurality of blades 212 radially extending from the periphery of the impeller shaft 211, and a gas flow path is formed between two adjacent blades 212.

Further, the impeller 210 further includes an impeller plate 213 protruding and extending outwardly from the outer peripheral surface of the impeller shaft 211, and each blade 212 includes a wide blade end 2121 connected to the impeller plate 213 and a narrow blade end 2122 connected to the outer peripheral surface of the impeller shaft 211; the blades 212 are tapered in the axial direction of the impeller shaft 211 from a wide blade end 2121 to a narrow blade end 2122, the wide blade end 2121 including an end face flush with the impeller plate 213, wherein the narrow blade end 2122 is adjacent to the suction port 221 and the wide blade end 2121 is adjacent to the discharge port 222.

Optionally, the motor housing 110 includes a middle housing 113, a first end cover 114 and a second end cover 115 matched with the middle housing 113, and a housing cavity for housing the stator and the rotor is formed in the middle housing 113, where the first end cover 114 and the second end cover 115 cover the two ends of the middle housing 113, and for the later maintenance of the motor assembly, the motor housing 110 is provided as a split type, i.e. the first end cover 114 and the second end cover 115 cover are detachably mounted at the two ends of the middle housing 113; shaft holes 116 are formed at the center positions of the first end cap 114 and the second end cap 115, respectively; the air inlets 111 are formed on the first and second end caps 114 and 115, respectively.

Further, the motor assembly includes a motor stator 121 and a motor rotor 122, and the motor rotor 122 and the motor stator 121 are coaxially and sequentially installed at the outer side of the motor shaft; the motor stator 121 includes a stator core and stator windings 1211, the stator windings 1211 including a plurality of winding units equally spaced around the outer circumference of the stator core, and gaps formed at the ends of adjacent winding units for the conduction of heat generated during operation of the motor assembly.

The stator core has a plurality of semi-closed slot penetrating along its axial direction, the opening of the plurality of semi-closed slot along its axial direction is abutted against the outer circumference of the motor rotor 122, and the end of the semi-closed slot communicates with the gap formed at the end of the adjacent winding unit.

In the operation process of the high-speed motor 100, heat mainly comes from air gap heat between the motor rotor 122 and the motor stator 121 due to high-speed rotation of the motor rotor 122, and in order to better guide out the air gap heat between the motor rotor 122 and the motor stator 121 from the inside of the motor housing 110, the semi-closed slot is abutted to the periphery of the motor rotor 122 along the axial opening of the semi-closed slot, so that the end part of the semi-closed slot is communicated with a gap formed at the end part of an adjacent winding unit.

Optionally, the casing 220 is horn-shaped, the casing 220 includes a large opening end, a small opening end and a middle section, the large opening end is connected with a side wall of the motor casing 110, the air suction opening 221 is disposed at the small opening end, and the air discharge opening 222 is disposed at a position of the middle section near the large opening end.

Wherein, impeller 210 installs in casing 220, and impeller 210's narrow leaf end 2122 installs in the position that is close to casing 220 osculum end, and impeller 210's wide leaf end 2121 installs in the position that is close to casing 220 osculum end, and casing 220 takes the shape that loudspeaker form can be better adapted impeller 210, and has the guide effect to the gas that gets into.

According to the utility model, the compression assembly 200 is connected to the motor shaft of the high-speed motor 100, the air suction port 221 and the air discharge port 222 are arranged on the shell 220 of the compression assembly 200, meanwhile, the air inlet 111 and the air discharge port 112 which are communicated with the accommodating space in the shell 220 of the compression assembly 200 are arranged on the motor shell 110, when the impeller 210 on the compression assembly 200 rotates at a high speed along with the motor shaft of the high-speed motor 100, a first air flow which is discharged from the air suction port 221 and is discharged from the air discharge port 112 is formed in the shell 220 of the compression assembly 200, and a second air flow which is discharged from the air inlet 111 and is used for carrying heat generated in the operation of the motor assembly and is discharged from the air discharge port 112 is formed.

Secondly, compared with a water-cooling heat dissipation mode, the centrifugal high-speed air compressor provided by the utility model has the advantages of simple overall structure, easiness in processing and capability of better carrying out air gap heat between the motor rotor 122 and the motor stator 121 from the inside of the motor shell 110.

The foregoing is merely illustrative embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present utility model, and the utility model should be covered. The protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. The centrifugal high-speed air compressor is characterized by comprising a high-speed motor and a compression assembly connected with a motor shaft of the high-speed motor;

The compression assembly comprises an impeller which is arranged around the motor shaft and rotates along with the motor shaft, and a shell for accommodating the impeller; the shell is provided with an air suction port and an air exhaust port which are used for communicating the accommodating space in the shell with the outside;

The high-speed motor comprises a motor shell and a motor assembly arranged in the motor shell, wherein the motor shell is provided with an air inlet communicated with the accommodating space in the shell and an air outlet communicated with the outside;

In the working process of the high-speed motor, the impeller rotates along with the motor shaft to generate negative pressure in the shell of the compression assembly, so that a first air flow discharged from the air outlet after air is taken in from the air suction port and a second air flow flowing into the motor shell through the air inlet after air is taken in from the air suction port, wherein the second air flow carries heat generated in the working of the motor assembly and is discharged through the air outlet are formed in the accommodating space.

2. The centrifugal high-speed air compressor according to claim 1, wherein the side walls of the opposite sides of the motor housing are respectively provided with a shaft hole through which the motor shaft passes, and the motor shaft comprises a first connecting part and a second connecting part which are respectively formed by extending after passing through the shaft holes;

The first connecting portion and the second connecting portion are respectively connected with the compression assembly.

3. The centrifugal high-speed air compressor according to claim 2, wherein an air bearing is provided at a position corresponding to the motor shaft and the shaft hole, and the motor shaft is penetrated through the air bearing;

When the motor shaft rotates at a high speed, a high-pressure gas film which enables the side walls of the motor shaft on two opposite sides of the motor shell to be in a suspension state is formed between the air bearing and the motor shaft.

4. The centrifugal high-speed air compressor according to claim 2, wherein the ends of the first and second connection portions are respectively provided with screw portions, and the compression assembly is fastened to the screw portions by screw nuts after being respectively connected to the first and second connection portions.

5. The centrifugal high-speed air compressor of claim 1, wherein the impeller comprises an impeller shaft sleeved on the motor shaft and a plurality of blades radially extending from the periphery of the impeller shaft, and a gas flow passage is formed between two adjacent blades.

6. The centrifugal high-speed air compressor according to claim 5, wherein the impeller further comprises an impeller plate protruding outwardly from an outer peripheral surface of the impeller shaft, each of the blades comprising a wide blade end connected to the impeller plate and a narrow blade end connected to the outer peripheral surface of the impeller shaft;

The blades are arranged in a tapered and inclined manner along the axial direction of the impeller shaft from the wide blade end to the narrow blade end, and the wide blade end comprises an end face flush with the impeller disc.

7. The centrifugal high-speed air compressor of claim 2, wherein the motor housing comprises a middle housing, a first end cover and a second end cover which are matched with the middle housing, a containing cavity for containing the motor assembly is formed in the middle housing, and the first end cover and the second end cover are covered at two ends of the middle housing;

The shaft holes are respectively formed at the central positions of the first end cover and the second end cover;

the air inlets are formed on the first end cover and the second end cover, respectively.

8. The centrifugal high-speed air compressor according to claim 1, wherein the motor assembly comprises a motor stator and a motor rotor, which are coaxially and sequentially installed at the outer side of the motor shaft;

The motor stator comprises a stator core and stator windings, wherein the stator windings comprise a plurality of winding units which are equidistantly wound around the periphery of the stator core, and gaps for leading out heat generated in the operation of the motor assembly are formed at the end parts of adjacent winding units.

9. The centrifugal high-speed air compressor according to claim 8, wherein the stator core has a plurality of semi-closed slot provided therethrough in an axial direction thereof, an opening of the plurality of semi-closed slot in the axial direction thereof being abutted against an outer periphery of the motor rotor, an end of the semi-closed slot communicating with a gap formed at an end of an adjacent winding unit.

10. The centrifugal high-speed air compressor of claim 1, wherein the housing is trumpet-shaped, the housing including a large mouth end, a small mouth end, and an intermediate section;

The large opening end is connected with the side wall of the motor shell, the air suction opening is arranged at the small opening end, and the air exhaust opening is arranged at the position, close to the large opening end, of the middle section.