CN111734654A

CN111734654A - Centrifugal compressor

Info

Publication number: CN111734654A
Application number: CN202010631673.2A
Authority: CN
Inventors: 吕鹏; 曹施鹏; 林伟伟; 冯凯
Original assignee: Shanghai Youshe Power Technology Co ltd
Current assignee: Shanghai Youshe Power Technology Co ltd
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2020-10-02

Abstract

The invention belongs to the technical field of compressors, and particularly relates to a centrifugal compressor which comprises a pneumatic module and a motor assembly; the pneumatic module comprises a volute, a diffuser, a fluid director and an impeller, the volute is arranged on the motor through a flange, the impeller and the diffuser are both arranged in the volute, the power output end of the motor assembly penetrates through the flange and the volute to be in transmission connection with the impeller, an air inlet of the volute is arranged at one end, far away from the motor assembly, of the volute, and the fluid director is arranged at the air inlet. Pneumatic module among this centrifugal compressor passes through the flange and is connected with motor element, when the flow or the pressure of the air of this centrifugal compressor output of needs adjustment, can be directly through changing the pneumatic module of unidimensional to make this centrifugal compressor can satisfy in the condition of the user demand of various differences, therefore need not to prepare the demand that the compressor of many different models also can satisfy equipment work.

Description

Centrifugal compressor

Technical Field

The invention belongs to the technical field of compressors, and particularly relates to a centrifugal compressor.

Background

The centrifugal compressor is a turbine compressor, and the kinetic energy of gas is improved by the centrifugal force action given to the gas by the high-speed rotation of an impeller, and then the flow velocity of the gas is reduced by the action of a diffuser so as to improve the gas pressure. The centrifugal compressor has the advantages of large air flow, simple and compact structure, light weight, small unit size, small occupied area and the like, so that the centrifugal compressor is widely applied to the industries of chemical industry, petroleum, refrigeration, sewage treatment and the like.

The existing compressor has more parts, so that the dismounting steps of the compressor are very complicated in the maintenance process, and particularly, when the compressor breaks down and wearing parts such as a bearing, a rotor and the like need to be replaced, maintenance personnel need to completely dismount parts such as a volute, a diffuser and the like to be repaired or replaced, so that the maintenance of the compressor cannot be finished on a working site and only can be returned to a factory for maintenance;

in addition, the motor and the shell of the direct-drive centrifugal compressor are designed in a customized mode, the flow and the pressure of each model are limited, and under different working environments, the flow and the pressure can be adjusted only by replacing compressors of different models, so that the requirement that a plurality of compressors of different models can meet the working requirement of equipment can be met. Accordingly, it is an urgent technical problem to provide a compressor capable of adjusting a flow rate and a pressure of the compressor according to a use demand.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides a centrifugal compressor to solve the technical problem in the prior art that the flow rate and pressure of the compressor cannot be adjusted according to the use condition.

The invention is realized by the following technical scheme:

a centrifugal compressor includes a pneumatic module and a motor assembly;

the pneumatic module comprises a volute, a diffuser, a fluid director and an impeller, the volute is arranged on the motor assembly through a flange, the impeller and the diffuser are arranged in the volute, the power output end of the motor assembly penetrates through the flange and the volute and the impeller are connected in a transmission mode, an air inlet of the volute is arranged at one end, far away from the motor assembly, of the volute, and the fluid director is arranged at the air inlet.

In order to better realize the invention, the structure is further optimized, the motor assembly comprises a fixed module and a rotating shaft, the fixed module comprises a shell, two stators and two bearing seats, the stators are arranged in the shell, the two bearing seats are respectively arranged at two ends of the shell, the rotating shaft penetrates through the stators, the rotating shaft is rotatably arranged on the bearing seats, and the rotating shaft is in transmission connection with the impeller.

In order to better implement the invention, in the above structure, the stator is disposed in the housing by potting.

In order to better implement the invention, in the above structure, it is further optimized that the rotating shaft is rotatably disposed on the bearing seat through a radial air foil bearing.

In order to better implement the present invention, the structure is further optimized, wherein an assembly hole is formed on the volute, a boss matched with the assembly hole is formed on the flange, and the volute and the flange are tightly connected through the fit of the assembly hole and the boss.

In order to better implement the present invention, in the above structure, it is further optimized that the inner ring of the flange is provided with an annular sealing member, the rotating shaft penetrates through the sealing member to be in transmission connection with the impeller, the diameter of the air inlet is larger than that of the sealing member, and the diameter of the sealing member is larger than that of the bearing seat.

In order to better implement the present invention, in the above structure, a thrust disc is further optimized, and the thrust disc is arranged on the rotating shaft and is located between the sealing element and the bearing seat.

In order to better implement the present invention, in the above structure, further optimized, thrust air foil bearings are provided between the thrust disc and the bearing seat and between the thrust disc and the seal.

In order to better implement the present invention, in the above structure, a motor base for fixing the motor assembly is further disposed on the housing.

In order to better implement the present invention, in the above structure, the pneumatic module includes a first-stage compression part and a second-stage compression part, and the first-stage compression part and the second-stage compression part are respectively disposed at two ends of the motor assembly.

In summary, the present invention has the following technical effects:

pneumatic module among this centrifugal compressor passes through the flange and is connected with motor element, when the flow or the pressure of the air of this centrifugal compressor output of needs adjustment, can be directly through changing the pneumatic module of unidimensional to make this centrifugal compressor can satisfy in the condition of various different demands, therefore need not to prepare the demand that the compressor of many different models also can satisfy equipment work.

In addition, the optimization scheme of the invention also has the following technical effects:

(1) the optimized scheme of the invention is that the stator is arranged in the shell through the potting process, the bearing seats are arranged at two ends of the shell to form the fixing modules, and then the bearing seats are subjected to finish machining so as to ensure the coaxiality and the verticality of the bearing seats, thereby ensuring that the centrifugal compressor is more convenient to produce and manufacture.

(2) The invention has the optimization scheme that the volute is provided with the assembly hole, the pneumatic module is isolated from the motor assembly through the sealing element, when the quick-wear part in the motor assembly needs to be replaced, a maintainer can sequentially take down the fluid director, the impeller and the sealing element, and then the bearing, the bearing seat and the rotating shaft in the motor assembly can be taken out for maintenance or replacement, so that the centrifugal compressor is more convenient to maintain.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a centrifugal compressor according to the present invention;

FIG. 2 is an exploded view of a centrifugal compressor according to the present invention;

FIG. 3 is a schematic view of the structure of the motor assembly of the centrifugal compressor of the present invention;

FIG. 4 is a schematic diagram of the structure of the pneumatic module of the centrifugal compressor of the present invention;

fig. 5 is a schematic structural view of a rotating shaft in a centrifugal compressor according to the present invention.

Reference numerals:

1. a pneumatic module; 11. a volute; 111. an assembly hole; 12. a diffuser; 13. a fluid director; 14. an impeller; 15. a flange; 2. a motor assembly; 21. a fixed module; 211. a housing 212, a stator; 213. a bearing seat; 22. a rotating shaft; 3. a radial air foil bearing; 4. a seal member; 5. a thrust disc; 6. a thrust air foil bearing; 7. a motor base.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 5:

a centrifugal compressor comprises a pneumatic module 1 and a motor assembly 2;

the pneumatic module 1 comprises a volute 11, a diffuser 12, a fluid director 13 and an impeller 14, wherein the volute 11 is arranged on the motor assembly 2 through a flange 15, the impeller 14 and the diffuser 12 are both arranged in the volute 11, the power output end of the motor assembly 2 penetrates through the flange 15 and the volute 11 to be in transmission connection with the impeller 14, an air inlet of the volute 11 is arranged at one end, far away from the motor assembly 2, of the volute 11, and the fluid director 13 is arranged at the air inlet.

When the centrifugal compressor with the structure is used, the air outlet of the pneumatic module 1 can be directly communicated with the air inlet of the equipment, so that the centrifugal compressor can provide compressed air for the equipment, and the equipment can normally run;

when centrifugal compressors with different powers need to be replaced, the pneumatic modules 1 with different sizes can be directly replaced, namely the pneumatic modules 1 with output compressed air flow and pressure meeting the requirement of equipment operation are selected, the selected pneumatic modules 1 are fixed with the motor assembly 2 through the flange 15, and then the impeller 14 is installed at the power output end of the motor assembly 2, so that the centrifugal compressor can output the compressed air required by the equipment operation.

The centrifugal compressor with the structure can convey compressed air with different flow rates and pressures only by replacing the pneumatic module 1, so that the requirement of equipment operation can be met without preparing a plurality of compressors with different models and models.

Preferably, the motor assembly 2 includes a fixed module 21 and a rotating shaft 22; wherein the content of the first and second substances,

the fixed module 21 comprises a shell 211, stators 212 and bearing seats 213, wherein the stators 212 are arranged inside the shell 211, the number of the bearing seats 213 is two, the two bearing seats 213 are respectively arranged at two ends of the shell 211, bearings are arranged on the bearing seats 213, a rotating shaft 22 passes through the stators 212 and is rotatably arranged on the bearing seats 213 through the bearings, and the end part of the rotating shaft 22 is in transmission connection with the impeller 14;

when the rotating shaft 22 of the motor assembly 2 rotates, the rotating shaft 22 drives the impeller 14 to rotate together, so that the centrifugal compressor can operate normally.

Specifically, the stator 212 in the fixed module 21 is disposed in the housing 211 through the potting process, so that the stator 212 has the insulating property, the two bearing seats 213 are then mounted at two ends of the housing 211, and the coaxiality and the verticality of the bearing seats 213 are processed through finish machining, so that the difficulty in production and manufacturing of the centrifugal compressor is reduced, and the production cost of the centrifugal compressor is effectively reduced.

Preferably, the bearing on the bearing seat 213 is a radial air foil bearing 3, which is a wedge effect generated by a wedge formed between the rotating shaft 22 and the bearing support surface; as the rotating speed of the rotating shaft 22 increases, due to the viscosity of the gas, the gas in the surrounding environment is dragged into the wedge, and when the rotating speed increases to a certain value, the gas pressure in the wedge increases to support the rotating shaft 22, so that the rotating shaft 22 is not in contact with other objects, and the abrasion of the rotating shaft 22 and the energy consumption of the centrifugal compressor during the operation process are reduced.

Example two:

as shown in fig. 1 to 5:

as a further optimization of the above embodiment, the volute casing 11 is provided with a mounting hole 111, the diameter of the air inlet is larger than that of the mounting hole 111, and the diameter of the mounting hole 111 is larger than that of the bearing seat 213;

the side of the flange 15 connected with the volute casing 11 is provided with a boss matched with the assembling hole 111, so that when the volute casing 11 is connected with the flange 15, the boss on the flange 15 can be embedded into the assembling hole 111 on the volute casing 11, so that the connection between the volute casing 11 and the flange 15 is more tight.

Preferably, the inner ring of the flange 15 is provided with an annular sealing member 4, the rotating shaft 22 passes through the sealing member 4 to be in transmission connection with the impeller 14, and the diameter of the sealing member 4 is larger than that of the bearing seat 213;

when the parts in the motor assembly 2 are damaged, a maintenance worker can sequentially take down the fluid director 13, the impeller 14 and the sealing element 4, then can take out the damaged parts such as the bearing seat 213, the bearing or the rotating shaft 22 and the like in the motor assembly 2, replace the damaged parts, and sequentially mount the sealing element 4, the impeller 14 and the fluid director 13 to finish the maintenance of the centrifugal compressor;

the centrifugal compressor with the structure can reduce the parts required to be disassembled in the maintenance process so as to reduce the maintenance difficulty of the centrifugal compressor, and therefore maintenance personnel can complete the maintenance of the centrifugal compressor on a working site.

Preferably, the rotating shaft 22 is provided with a thrust disc 5, and the thrust disc 5 is positioned between the sealing element 4 and the bearing seat 213; the thrust plate can balance the axial force generated by the impeller 14 during rotation, so that the operation of the centrifugal compressor is more stable.

Preferably, thrust air foil bearings 6 are arranged between the thrust disc 5 and the bearing seat 213 and between the thrust disc 5 and the sealing element 4, and the thrust air foil bearings 6 can reduce friction between the thrust disc 5 and the bearing seat 213 and between the thrust disc 5 and the sealing element 4, so that the centrifugal compressor operates more smoothly, and energy consumption of the centrifugal compressor in the working process is effectively reduced.

Preferably, the motor base 7 is arranged on the housing 211, and the centrifugal compressor is fixedly mounted on a station through the motor base 7, so that the centrifugal compressor is more stable in operation.

Preferably, the pneumatic module 1 comprises a first-stage compression part and a second-stage compression part; wherein the content of the first and second substances,

one-level compression portion and second grade compression portion set up respectively at motor element 2's both ends, and impeller 14 in one-level compression portion and the second grade compression portion fixes respectively at the both ends of pivot 22, make pivot 22 rotate two impeller 14 rotations at the rotation in-process, so that work that one-level compression portion and second grade compression portion can be normal, and thus effectual improvement this centrifugal compressor's work efficiency.

The air outlet of the first-stage compression part can be communicated with the air inlet of the second-stage compression part, so that the second-stage compression part can perform secondary compression on the compressed air output by the first-stage compression part, and the pressure of the air output by the centrifugal compressor is improved;

in addition, the air outlets of the first-stage compression part and the second-stage compression part can also be directly communicated with the air inlet of the equipment, so that the flow of compressed air output by the centrifugal compressor is improved, and the working efficiency of the centrifugal compressor is effectively improved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A centrifugal compressor, characterized in that: comprises a pneumatic module (1) and a motor component (2);

pneumatic module (1) includes spiral case (11), diffuser (12), divertor (13) and impeller (14), spiral case (11) pass through flange (15) and set up on motor element (2), impeller (14) with diffuser (12) all set up in spiral case (11), just the power take off end of motor element (2) passes flange (15) with spiral case (11) with impeller (14) transmission is connected, the air intake setting of spiral case (11) is in spiral case (11) is kept away from the one end of motor element (2), divertor (13) set up air intake department.

2. The centrifugal compressor of claim 1, wherein: motor element (2) are including fixed module (21) and pivot (22), fixed module (21) are including casing (211), stator (212) and bearing frame (213), stator (212) set up in casing (211), the quantity of bearing frame (213) has two, two bearing frame (213) set up respectively the both ends of casing (211), pivot (22) are passed stator (212), just pivot (22) rotate to be set up on bearing frame (213), pivot (22) with impeller (14) transmission is connected.

3. The centrifugal compressor of claim 2, wherein: the stator (212) is disposed within the housing (211) by a potting process.

4. The centrifugal compressor of claim 3, wherein: the rotating shaft (22) is rotatably arranged on the bearing seat (213) through a radial air foil bearing (3).

5. The centrifugal compressor according to any one of claims 2 to 4, wherein: be provided with pilot hole (111) on spiral case (11), be provided with on flange (15) with the boss that pilot hole (111) match, spiral case (11) with flange (15) pass through pilot hole (111) with the cooperation zonulae occludens of boss.

6. The centrifugal compressor of claim 5, wherein: the inner ring of the flange (15) is provided with an annular sealing element (4), the rotating shaft (22) penetrates through the sealing element (4) to be in transmission connection with the impeller (14), the diameter of the air inlet is larger than that of the sealing element (4), and the diameter of the sealing element (4) is larger than that of the bearing seat (213).

7. The centrifugal compressor of claim 6, wherein: the rotating shaft (22) is provided with a thrust disc (5), and the thrust disc (5) is located between the sealing element (4) and the bearing seat (213).

8. The centrifugal compressor of claim 7, wherein: thrust air foil bearings (6) are arranged between the thrust disc (5) and the bearing seat (213) and between the thrust disc (5) and the sealing element (4).

9. The centrifugal compressor of claim 8, wherein: and a motor base (7) convenient for fixing the motor component (2) is arranged on the shell (211).

10. The centrifugal compressor of claim 1, wherein: the pneumatic module (1) comprises a first-stage compression part and a second-stage compression part, wherein the first-stage compression part and the second-stage compression part are respectively arranged at two ends of the motor component (2).