CN215566891U

CN215566891U - Air compressor

Info

Publication number: CN215566891U
Application number: CN202121305955.XU
Authority: CN
Inventors: 刘质冰
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-01-18
Anticipated expiration: 2031-06-11

Abstract

The present disclosure provides an air compressor, which includes: the shell is used for limiting the inner cavity of the air compressor, and a rotating shaft, a stator and a water cooling structure are arranged in the inner cavity; and the volute is arranged at one end of the shell, the volute defines an internal space, the internal space comprises a volute channel, an air flow channel is arranged in the shell, one end of the air flow channel is communicated with the volute channel, the other end of the air flow channel is communicated with the inner cavity of the air compressor, and one part of the air flow channel is adjacent to the water cooling structure. According to the air compressor of this disclosure, cooling gas circulation channel has inside, and this cooling gas circulation channel need not obtain the cooling air with the help of external intercooler etc. but cools off the compressed air as the cooling air through the water-cooling structure that has now in the air compressor, and this has simplified whole air compressor's overall arrangement, has reduced air compressor's manufacturing and use cost simultaneously.

Description

Air compressor

Technical Field

The present invention relates to air compressors, and more particularly to cooling gas circulation passages within air compressors.

Background

An air compressor is an apparatus for supplying compressed air, which is widely used in various mechanical fields. Air compressors generate a lot of heat during operation and require a high level of cooling. Accordingly, air compressors are typically provided with gas and water cooling passages for dissipating heat from various components within the air compressor.

Taking an air compressor for supplying compressed air to a fuel cell of a fuel cell vehicle as an example, the source of the cooling gas flowing through the gas cooling channel is as follows: the external air is compressed by the air compressor and then flows out of the air outlet, enters the external intercooler for cooling, then a part of the cooled air returns to the air compressor from the cooling air inlet of the air compressor to dissipate heat of some components, and then the part of the air is discharged from the cooling air outlet of the air compressor. Above-mentioned gas cooling channel needs obtain cooling air through external intercooler for whole air compressor's overall arrangement is too complicated.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide an air compressor having a cooling gas circulation passage therein. The air compressor includes: the air compressor comprises a shell, a motor, a stator and a water cooling structure, wherein the shell limits an inner cavity of the air compressor, a rotating shaft, the stator and the water cooling structure are arranged in the inner cavity, the rotating shaft is arranged in the center of the inner cavity, the stator is sleeved on the rotating shaft, and the water cooling structure is sleeved on the stator; and the setting is in the spiral case of the one end of casing, its inner space is injectd to the spiral case, the inner space includes the spiral case passageway, its characterized in that, be provided with airflow channel in the casing, airflow channel's one end with spiral case passageway intercommunication, the other end and air compressor's inner chamber intercommunication, and airflow channel's some is close to the water-cooling structure, wherein, air compressor still includes the pipeline, pipeline intercommunication air compressor's inner chamber with the inner space of spiral case, thereby the inner space of spiral case airflow channel air compressor's inner chamber with form the cooling gas circulation passageway between the pipeline.

In one embodiment, the housing includes: a housing; the bearing end cover and the impeller end cover are sequentially arranged at one end of the shell; and a casing end cover arranged at the other end of the casing, wherein the airflow channel comprises a second opening hole arranged in the impeller end cover, a third opening hole arranged in the bearing end cover, a fourth opening hole arranged in the casing and a fifth opening hole arranged in the casing end cover.

In one embodiment, the second, third, fourth and fifth apertures are axial apertures and the fifth aperture is a radial aperture.

In one embodiment, a first opening is provided in the volute, and the airflow passage communicates with the volute passage through the first opening.

In one embodiment, the air flow passage further includes a communication portion provided in the water-cooling structure, and the third opening communicates with the fourth opening via the communication portion.

In one embodiment, the bearing end cover is provided with an air outlet hole, the volute is provided with a backflow hole, and the pipeline is connected with the air outlet hole and the backflow hole to communicate an inner cavity of the air compressor and an inner space of the volute.

In one embodiment, the air outlet and the return hole are provided with sealing adapters.

In one embodiment, the air compressor includes an impeller mounted in the interior space of the volute, wherein the bearing end cap is provided with a sixth opening for introducing air leaking from the back of the impeller to the back of the impeller end cap into the interior chamber of the air compressor.

In one embodiment, the water cooling structure is a cooling water jacket including a spiral coolant flow passage.

In one embodiment, the conduit is a hose.

The air compressor according to the present disclosure has a cooling gas circulation passage inside, which obtains cooling air without an external intercooler or the like, but cools compressed air as cooling air through an existing water cooling structure in the air compressor, which simplifies the layout of the entire air compressor, while reducing the manufacturing and use costs of the air compressor.

Drawings

The accompanying drawings are provided to assist the reader in a more thorough understanding of the disclosure, in which:

FIG. 1 is a cutaway view of an air compressor according to one embodiment of the present invention, wherein the cooling gas circulation passages inside the air compressor are schematically shown with arrows;

FIG. 2 is a cut-away view of the volute of the air compressor shown in FIG. 1;

FIG. 3 is a cut-away view of an impeller end cover of the air compressor shown in FIG. 1;

FIG. 4 is a cut-away view of a bearing cap of the air compressor shown in FIG. 1; and

FIG. 5 is a cut-away view of a casing of the air compressor shown in FIG. 1.

Detailed Description

The present disclosure is described below by way of specific examples. It should be understood that the specific embodiments are provided only for the purpose of facilitating a thorough understanding of the present disclosure, and are not intended to limit the present disclosure. Accordingly, the following examples are illustrative only, and the scope of the disclosure is to be limited only by the claims appended hereto.

FIG. 1 is a cut-away view of an air compressor according to one embodiment of the present invention.

The air compressor comprises a cylindrical shell 1, a rotating shaft 2, a stator 3, a water cooling structure 4 and the like, wherein the rotating shaft, the stator and the water cooling structure are arranged in the shell 1. The rotating shaft 2 is arranged in the center of the casing 1, the stator 3 is sleeved on the rotating shaft 2, and the water cooling structure 4 is sleeved on the stator 3. One end of the casing 1 is sequentially provided with a bearing end cover 5, an impeller end cover 6 and a volute 7, and the other end of the casing is closed by a casing end cover 8 and a small end cover 13. The casing 1, the bearing end cap 5, the impeller end cap 6, and the casing end cap 8 are all components of a housing of the air compressor that collectively define an interior cavity of the air compressor for housing various components of the air compressor.

With continued reference to fig. 1, the spindle 2 includes a spindle body 21, a flying disc 22, and an impeller mounting portion 23. Flying disc 22 is an annular flange extending radially outward near one end of shaft body 21. The impeller mounting portion 23 is an elongated rod portion extending axially from the end portion of the shaft main body 21, and the impeller 10 is mounted on the impeller mounting portion 23 by means of a nut, a washer, or the like. Wherein one or more permanent magnets are provided in the rotating shaft main body 21, and the rotating shaft main body 21 is rotatably supported in the inner cavity of the air compressor by

radial bearings

9a, 9b provided at both ends thereof. The

radial bearings

9a, 9b are formed in a cylindrical shape with a radial projection for radially positioning the rotary shaft 2.

The bearing end cover 5 is a disc-shaped member with a circular hole in the center, is sleeved on the rotating shaft main body 21 between the radial bearing 9a and the flying disc 22, and is mounted in a sealing manner by abutting against one end of the machine shell 1. The impeller end cover 6 is also a disc-shaped member with a circular hole in the center, is sleeved on the rotating shaft main body 21 between the flying disc 22 and the impeller 10, and is in sealing installation against the bearing end cover 5.

Thrust bearings

11a and 11b are respectively arranged between the impeller end cover 6 and the flying disc 22 and between the bearing end cover 5 and the flying disc 22, and are used for axially positioning the rotating shaft 2. Further, the stepped end face of the volute 7 is sealingly mounted against the bearing end cover 5 and the impeller end cover 6 to define the impeller 10 between the volute 7 and the impeller end cover 6. In general, outside air enters the air compressor from the air inlet 7a of the scroll 7, is compressed as the impeller 10 rotates at a high speed and enters the scroll passage 7b, and is then discharged from the air compressor via the air outlet 7c communicating with the scroll passage 7 b.

The configuration of the cooling gas circulation passage inside the air compressor according to the present invention is described in detail below.

Referring to fig. 1 and 2, the volute 7 is provided with a first opening 7d on a side close to the impeller end cover 6, and the first opening 7d may be an axial opening and communicates with the volute passage 7 b. Referring to fig. 1 and 3, the impeller end cover 6 is provided with a second opening 6a, and the second opening 6a may be an axial opening provided in a radial flange of the impeller end cover 6. Referring to fig. 1 and 4, the bearing end cover 5 is provided with a third opening 5a, and the third opening 5a may also be an axial opening. Referring to fig. 1 and 5, the casing 1 is provided with a fourth opening 1a, and the fourth opening 1a may be an elongated axial opening leading from one end of the casing 1 to the other end. Referring finally to fig. 1, the housing cover 8 is provided with a fifth opening 8a, and the fifth opening 8a may be a radial hole and is communicated with the inner cavity of the air compressor.

When the volute 7, the impeller end cover 6, the bearing end cover 5, the casing 1, the casing end cover 8 and the like are assembled in place, the first opening 7d, the second opening 6a, the third opening 5a, the fourth opening 1a and the fifth opening 8a are communicated in sequence to form a continuous airflow channel (as shown by arrows in fig. 1), so that a part of the compressed air in the volute channel 7b flows along the airflow channel. Since the casing 1 is disposed adjacent to the water cooling structure 4, when the compressed air flows through the fourth opening 1a in the casing 1, the compressed air will be cooled by the cooling liquid flowing in the water cooling structure 4. The cooled compressed air then flows into the inner chamber of the air compressor via the fifth opening 8a in the casing end cover 8. Specifically, a part of the cooled compressed air flows into the space S defined by the radial bearing 9b, the stator 3, and the water-cooled structure 4, and another part of the cooled compressed air flows into the gap between the radial bearing 9b and the rotary shaft 2. Then, the two portions of air converge and flow into the gap between the stator 3 and the rotary shaft 2, and continue to flow back into the first ring groove G1 defined by the radial bearing 9a and the bearing cover 5. Further, the bearing end cover 5 is provided with an air outlet hole 5 b. As shown in fig. 4, the outlet aperture 5b is radially offset from the third opening 5a in the bearing end cap 5 by about 90 °, however, the utility model is not limited to this angle. The air outlet hole 5b may be a radial hole communicating with the first ring groove G1, and is connected to a return hole 7e on the scroll casing 7 via a pipe 12 to introduce the air in the first ring groove G1 into the scroll casing 7, and then the air is compressed again with the rotation of the impeller 10 and enters the scroll casing passage 7b, and so on.

Thereby, effective cooling of the

radial bearings

9a and 9b, the rotating shaft main body 21, and the like is achieved by internal gas circulation. The cooling gas circulation channel does not need to obtain cooling air by means of an external intercooler and the like, but cools the compressed air through the existing water cooling structure in the air compressor to serve as the cooling air, so that the layout of the whole air compressor is simplified, and the manufacturing and using cost of the air compressor is reduced.

In the case where the third opening 5a in the bearing cap 5 is not directly communicated with the fourth opening 1a in the housing case 1 (as shown in fig. 1), the above-mentioned airflow passage further includes a communicating portion 4a provided in the water-cooling structure 4. The communication portion 4a may be an opening leading from one end of the water-cooled structure 4 to the outer surface of the water-cooled structure 4, or may be a cutout (as shown in fig. 1) formed by cutting out a part of the substance from the end of the water-cooled structure 4. The third opening 5a communicates with the fourth opening 1a via the communication portion 4 a. Preferably, the water cooling structure 4 is implemented as a cylindrical cooling water jacket including a spiral-shaped coolant flow passage. The spiral cooling liquid flow channel can increase the heat exchange area of the cooling water jacket, so that the heat dissipation efficiency is improved.

On the other hand, a part of the air leaking from the back surface of the impeller 10 flows into the second ring groove G2 defined by the flying disc 22 and the impeller cover 6 via the clearance between the impeller 10, the impeller cover 6, and the rotary shaft 2, as shown by the arrow in fig. 1. As shown in fig. 4, a sixth opening 5c is further provided in the bearing end cover 5, and the sixth opening 5c is radially offset from the third opening 5a in the bearing end cover 5 to fluidly connect the second ring groove G2 with the first ring groove G1, so that the gas in the second ring groove G2 can flow into the first ring groove G1 and then flow back into the volute 7 via the pipe 12, and so on.

This realizes gas cooling of the components such as the impeller cover 6 and the flying disc 22 through the gas flow passage. Although the air leaked from the back surface of the impeller 10 is at a relatively high temperature, the temperature is lower than that of the rotating shaft 2 at high-speed rotation. Therefore, the air leaking from the back of impeller 10 can still achieve a certain degree of cooling of components such as impeller head 6 and flying disc 22.

In one embodiment according to the present invention, the conduit 12 may be implemented as a hose so as to be connected between the air outlet hole 5b of the bearing end cover 5 and the return hole 7e of the scroll 7. Further, the air outlet 5b and the return hole 7e are provided with sealing adapters, so that the hose 12 is hermetically connected with the air outlet 5b and the return hole 7 e.

Although the specific structure of the cooling gas circulation passage in the air compressor according to one embodiment of the present invention is described above with reference to fig. 1 to 5, those skilled in the art will appreciate that the configuration of the cooling gas circulation passage may be modified according to the structure of the air compressor. For example, when the air compressor further includes other components than the above components, it is conceivable that the cooling gas circulation passage further includes openings or cutouts provided in the other components. Alternatively, the components by which the cooling gas circulation passage is routed may be adjusted according to the actual situation.

The inventive concept of the present disclosure lies in: providing an air flow passage within the housing of the air compressor, the air flow passage having one end in communication with the volute passage 7b and another end in communication with the interior chamber of the air compressor, and a portion of the air flow passage being adjacent the water cooling structure 4 of the air compressor, such that a portion of the compressed air within the volute passage 7b can be cooled as it flows through the portion of the air flow passage and then into the interior chamber of the air compressor to cool the component to be cooled disposed therein; furthermore, a duct 12 communicating the inner chamber of the air compressor with the scroll casing 7 is provided to reintroduce the air, which has cooled the component to be cooled in the inner chamber, into the scroll casing 7, thereby forming a cooling gas circulation passage. Those skilled in the art will appreciate that air compressors employing the above inventive concepts fall within the scope of the present disclosure.

It should be noted that the terms "first" to "sixth" and the like in the description and the claims of the present disclosure are only used for distinguishing similar objects and are not used for describing a specific order or sequence.

Although specific embodiments of the present disclosure have been disclosed above, those skilled in the art will appreciate that various modifications, substitutions and alterations can be made without departing from the spirit and scope of the disclosure. Accordingly, the scope of the present disclosure is not limited to the specific embodiments described above, but is only limited by the appended claims.

Claims

1. An air compressor, comprising:

the air compressor comprises a shell, wherein the shell limits an inner cavity of the air compressor, a rotating shaft (2), a stator (3) and a water cooling structure (4) are arranged in the inner cavity, the rotating shaft (2) is arranged in the center of the inner cavity, the stator (3) is sleeved on the rotating shaft (2), and the water cooling structure (4) is sleeved on the stator (3); and

a volute (7) disposed at one end of the housing, the volute (7) defining an interior space thereof, the interior space including a volute channel (7b),

it is characterized in that an air flow channel is arranged in the shell, one end of the air flow channel is communicated with the volute channel (7b), the other end of the air flow channel is communicated with the inner cavity of the air compressor, and one part of the air flow channel is adjacent to the water cooling structure (4),

wherein the air compressor further comprises a pipeline (12), and the pipeline (12) is communicated with an inner cavity of the air compressor and an inner space of the volute (7), so that a cooling gas circulation channel is formed among the inner space of the volute (7), the airflow channel, the inner cavity of the air compressor and the pipeline (12).

2. The air compressor of claim 1, wherein the housing comprises:

a housing (1);

the bearing end cover (5) and the impeller end cover (6) are sequentially arranged at one end of the shell (1); and

a casing end cover (8) arranged at the other end of the casing (1),

wherein the air flow channel comprises a second opening (6a) arranged in the impeller end cover (6), a third opening (5a) arranged in the bearing end cover (5), a fourth opening (1a) arranged in the casing (1) and a fifth opening (8a) arranged in the casing end cover (8).

3. The air compressor according to claim 2, wherein the second, third, fourth apertures (6a, 5a, 1a) are axial apertures, and the fifth aperture (8a) is a radial aperture.

4. The air compressor according to any one of claims 1 to 3, wherein a first opening (7d) is provided on the scroll casing (7), and the air flow passage communicates with the scroll casing passage (7b) through the first opening (7 d).

5. The air compressor according to claim 2, wherein the air flow passage further includes a communication portion (4a) provided in the water-cooling structure (4), and the third opening (5a) communicates with the fourth opening (1a) via the communication portion (4 a).

6. The air compressor according to claim 2, wherein an air outlet hole (5b) is provided on the bearing end cover (5) and a return hole (7e) is provided on the volute (7), and the pipe (12) communicates an inner cavity of the air compressor and an inner space of the volute (7) by connecting with the air outlet hole (5b) and the return hole (7 e).

7. The air compressor according to claim 6, wherein a sealing adapter is provided at each of the air outlet hole (5b) and the return hole (7 e).

8. An air compressor according to claim 1, characterized in that the air compressor comprises an impeller (10) mounted in the inner space of the volute (7),

and the bearing end cover (5) is provided with a sixth opening (5c), and the sixth opening (5c) is used for introducing air leaked from the back surface of the impeller (10) to the back surface of the impeller end cover (6) into an inner cavity of the air compressor.

9. The air compressor according to claim 1, wherein the water cooling structure (4) is a cooling water jacket comprising a spiral-shaped coolant flow passage.

10. The air compressor according to claim 1, wherein the conduit (12) is a hose.