CN216672796U - Motor cooling system of refrigeration centrifugal compressor - Google Patents
Motor cooling system of refrigeration centrifugal compressor Download PDFInfo
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- CN216672796U CN216672796U CN202120841935.8U CN202120841935U CN216672796U CN 216672796 U CN216672796 U CN 216672796U CN 202120841935 U CN202120841935 U CN 202120841935U CN 216672796 U CN216672796 U CN 216672796U
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- liquid
- flash tank
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- 238000001816 cooling Methods 0.000 title claims abstract description 31
- 238000005057 refrigeration Methods 0.000 title claims abstract description 15
- 239000003507 refrigerant Substances 0.000 claims abstract description 73
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 28
- 239000000110 cooling liquid Substances 0.000 claims abstract description 20
- 239000000112 cooling gas Substances 0.000 claims abstract description 11
- 230000006835 compression Effects 0.000 claims description 15
- 238000007906 compression Methods 0.000 claims description 15
- 239000013589 supplement Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The application discloses refrigeration centrifugal compressor motor cooling system, this refrigeration centrifugal compressor motor cooling system includes: a condenser, a motor, an evaporator and a flash tank; the refrigerant outlet of the condenser is connected with a circulation groove in a shell of the motor through a motor cooling liquid inlet pipeline and is used for absorbing heat of the inner stator of the motor; a refrigerant outlet of the circulation groove is connected with the flash tank, and the flash tank is used for separating gas and liquid of the entering refrigerant; a gas outlet of the flash evaporator is communicated with a left cavity of the motor through a motor cooling gas supply pipeline, and a right cavity of the motor is connected with the evaporator through a motor cooling gas return pipeline; the liquid outlet of the flash tank is connected with the evaporator. The motor rotor structure solves the problems that too much liquid refrigerant exists in a motor cavity in the related art, the liquid refrigerant enters a bearing to easily cause instability of the bearing, and the liquid level exceeds the lower edge of a motor rotor to cause unstable operation and large loss of the motor.
Description
Technical Field
The application relates to the technical field of compressor cooling, in particular to a motor cooling system of a refrigeration centrifugal compressor.
Background
The traditional centrifugal refrigeration compressor motor cooling mode is that the liquid refrigerant in the condenser is throttled and then directly introduced into the motor cavity, and because the existing permanent magnet synchronous motor is high in efficiency, the needed refrigerant is less, the excessive liquid refrigerant in the motor cavity can not be gasified, so that the excessive liquid refrigerant exists in the motor cavity, the liquid refrigerant enters the bearing and then easily causes the instability of the bearing, and the liquid level exceeds the lower edge of the motor rotor and then causes the instability and the large loss of the motor.
Aiming at the problems that in the related art, too much liquid refrigerant exists in a motor cavity, the liquid refrigerant enters a bearing to easily cause instability of the bearing, and the liquid level exceeds the lower edge of a motor rotor to cause unstable operation and large loss of the motor, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
The main objective of the present application is to provide a cooling system and a cooling method for a motor of a refrigeration centrifugal compressor, so as to solve the problems that too much liquid refrigerant exists in a motor cavity in the related art, the liquid refrigerant enters a bearing and is easy to cause instability of the bearing, and the liquid level exceeds the lower edge of a motor rotor to cause unstable operation and large loss of the motor.
In order to achieve the above object, the present application provides a refrigeration centrifugal compressor motor cooling system comprising: a condenser, a motor, an evaporator and a flash tank; the refrigerant outlet of the condenser is connected with a circulation groove in a shell of the motor through a motor cooling liquid inlet pipeline and is used for absorbing heat of the inner stator of the motor; a refrigerant outlet of the circulation groove is connected with the flash tank, and the flash tank is used for separating gas and liquid of the entering refrigerant; a gas outlet of the flash evaporator is communicated with a left cavity of the motor through a motor cooling gas supply pipeline, and a right cavity of the motor is connected with the evaporator through a motor cooling gas return pipeline; the liquid outlet of the flash tank is connected with the evaporator.
Further, a motor cooling liquid inlet pipeline ball valve is arranged on the motor cooling liquid inlet pipeline; and a liquid outlet of the flash evaporator is connected with the evaporator through a secondary throttling valve.
Furthermore, a motor cooling return air pipeline valve is arranged on the motor cooling return air pipeline.
Further, the flash tank is connected with the condenser through a first-stage throttle valve.
The flash evaporator further comprises an air supply pipeline connected to the flash evaporator, and a multi-stage compression front stage and a multi-stage compression rear stage are connected in parallel on the air supply pipeline; the front stage of the multi-stage compression is connected with the evaporator, and the rear stage of the multi-stage compression is connected with the condenser.
Furthermore, the motor comprises a motor shell, a stator and a rotor which are arranged in the motor shell, and the circulation groove is formed in the motor shell and is arranged around the motor shell.
Further, a gap is formed between the stator and the rotor, a vent hole is formed in the outer side of the stator, and the gap and the vent hole are communicated with the left side cavity and the right side cavity of the motor.
According to another aspect of the present application, there is provided a method for cooling a motor of a refrigeration centrifugal compressor using a refrigeration centrifugal compressor motor cooling system, the method comprising the steps of:
(1) introducing a liquid refrigerant in the condenser into a circulation groove of a shell of the motor, and partially gasifying the liquid refrigerant after the liquid refrigerant absorbs the heat of a stator of the motor to form a gas refrigerant;
(2) liquid refrigerant and gas refrigerant enter a flash tank, and liquid and gas are separated by the flash tank;
(3) the separated gas enters a left cavity of the motor from the flash tank, then reaches a right cavity of the motor through a gap between a stator and a rotor of the motor and a vent hole on the outer side of the stator, and then returns to the evaporator; the separated liquid enters the evaporator from the flash evaporator.
Further, the step (1) specifically comprises: and (3) introducing the liquid refrigerant in the condenser into a circulation groove of a shell of the motor after throttling, and partially gasifying the liquid refrigerant after the liquid refrigerant absorbs the heat of a stator of the motor to form a gas refrigerant.
Further, the liquid separated in the step (3) enters the evaporator from the flash evaporator after being throttled.
In the embodiment of the application, a condenser, a motor, an evaporator and a flash evaporator are arranged; the refrigerant outlet of the condenser is connected with a circulation groove in a shell of the motor through a motor cooling liquid inlet pipeline and used for absorbing heat of the motor inner stator; a refrigerant outlet of the circulation groove is connected with the flash tank, and the flash tank is used for separating gas and liquid of the entering refrigerant; a gas outlet of the flash evaporator is communicated with a left cavity of the motor through a motor cooling gas supply pipeline, and a right cavity of the motor is connected with the evaporator through a motor cooling gas return pipeline; the liquid outlet of the flash tank is connected with the evaporator. The motor cooling medium separation device has the advantages that the motor cooling medium is separated into liquid and gas, the gas cooling medium enters the motor cavity to be cooled, the technical effect that a large amount of liquid cooling medium stored in the motor cavity leads to instability of a bearing or a motor is achieved, the problem that in the related technology, too much liquid cooling medium exists in the motor cavity, the liquid cooling medium enters the bearing to cause instability of the bearing easily, and the problem that the motor is unstable in operation and large in loss due to the fact that the liquid level exceeds the lower edge of a motor rotor is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
FIG. 1 is a schematic structural diagram according to an embodiment of the present application;
the system comprises a condenser 1, vent holes 2, circulation grooves 3, gaps 4, a multi-stage compression front stage 5, a gas supplementing pipeline 6, a motor cooling gas supply pipeline 7, a first-stage throttling valve 8, a flash evaporator 9, a second-stage throttling valve 10, a motor cooling liquid return pipeline 11, an evaporator 12, a motor cooling liquid return pipeline valve 13, a multi-stage compression rear stage 14, a motor cooling liquid inlet pipeline 15, a motor cooling liquid inlet pipeline 16, a motor cooling liquid inlet pipeline ball valve 17 and a motor cooling liquid return pipeline 18.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used.
In this application, the terms "upper", "lower", "inside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as the case may be.
Furthermore, the terms "disposed," "provided," "connected," "secured," and the like are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the present embodiment provides a cooling system for a refrigeration centrifugal compressor motor 17, the cooling system for the refrigeration centrifugal compressor motor 17 comprising: condenser 1, motor 17, evaporator 12 and flash tank 9; wherein, the coolant outlet of the condenser 1 is connected with the circulation groove 3 in the outer casing of the motor 17 through the motor cooling liquid inlet pipeline 15, and is used for absorbing the heat of the stator in the motor 17; a refrigerant outlet of the circulation groove 3 is connected with a flash tank 9, and the flash tank 9 is used for gas-liquid separation of the entering refrigerant; the gas outlet of the flash evaporator 9 is communicated with the left cavity of the motor 17 through the motor cooling gas supply pipeline 7, and the right cavity of the motor 17 is connected with the evaporator 12 through the motor cooling gas return pipeline 18; the liquid outlet of the flash tank 9 is connected to an evaporator 12.
In this embodiment, the liquid refrigerant in the condenser 1 is throttled to reduce the temperature, the cooled liquid refrigerant enters the circulation groove 3 in the housing of the motor 17 to cool the stator in the motor 17, the liquid refrigerant absorbs the heat of the stator of the motor 17 and is partially gasified, and the gasified refrigerant and the unvaporized liquid refrigerant enter the flash tank 9 together and are subjected to gas-liquid separation by the flash tank 9. The separated liquid refrigerant directly enters the evaporator 12 after throttling and temperature reduction, the gas refrigerant flows into the motor cooling air supply pipeline 7 from the gas outlet of the flash evaporator 9 and flows from the left cavity of the motor 17 to the right cavity of the motor 17, the cavity of the motor 17 is cooled by the gas refrigerant, and the gas refrigerant discharged from the right cavity of the motor 17 returns to the evaporator 12. This embodiment has reached and has carried out liquid and gaseous separation with motor 17 refrigerant to make gaseous refrigerant get into the motor 17 intracavity and carry out the refrigerated purpose, thereby realized avoiding accumulating a large amount of liquid refrigerant in the motor 17 intracavity and leaded to bearing or motor 17 unstability's technological effect, and then solved and had too much liquid refrigerant in the motor 17 intracavity among the relevant art, liquid refrigerant gets into the bearing and then arouses the bearing unstability easily, and the liquid level surpasss motor 17 rotor lower edge and can cause motor 17 to move unstability, the big problem of loss.
In addition, in this embodiment, a refrigerant inlet of the circulation groove 3 of the housing of the motor 17 is connected to a refrigerant outlet of the condenser 1 through the motor cooling liquid inlet pipeline 15, and a refrigerant outlet of the circulation groove 3 is connected to the flash evaporator 9 through the motor cooling liquid return pipeline 11, but not connected to the evaporator 12, so that after the liquid refrigerant passes through the circulation groove 3 of the housing of the motor 17 to exchange heat with the stator of the motor 17, part of the liquid refrigerant absorbs heat and is gasified, and then enters the flash evaporator 9 along with the gasified liquid refrigerant. At the moment, the temperatures of the liquid refrigerant, the gas refrigerant and the circulation groove 3 are close, then the gas refrigerant enters the cavity of the motor 17 to cool the cavity of the motor 17, namely the cooling temperature of the circulation groove 3 is close to that of the cavity of the motor 17, so that the phenomenon that the shell of the motor 17 is condensed due to overlarge temperature difference between the cavity of the motor 17 and the circulation groove 3 can be avoided.
As shown in fig. 1, a motor cooling liquid inlet pipeline ball valve 16 is arranged on a motor cooling liquid inlet pipeline 15, and the liquid refrigerant discharged from the condenser 1 is throttled and cooled by the motor cooling liquid inlet pipeline ball valve 16; the liquid outlet of the flash evaporator 9 is connected with the evaporator 12 through the second-stage throttle valve 10, and the liquid refrigerant after gas-liquid separation of the flash evaporator 9 is throttled and cooled through the second-stage throttle valve 10. The motor cooling return air pipeline 18 is provided with a motor cooling return air pipeline valve 13, and the flash tank 9 is connected with the condenser 1 through the primary throttle valve 8.
As shown in fig. 1, the flash evaporator further comprises an air supply pipeline 6 connected to the flash evaporator 9, wherein the air supply pipeline 6 is connected with a multi-stage compression front stage 5 and a multi-stage compression rear stage 14 in parallel; the front stage 5 of the multi-stage compression is connected to the evaporator 12, and the rear stage 14 of the multi-stage compression is connected to the condenser 1. The air supplement of the multi-stage compression is realized through the air supplement pipeline 6, so that the energy efficiency of the compressor is improved.
As shown in figure 1, the motor 17 comprises a motor shell, a stator and a rotor which are arranged in the motor shell, and the circulation groove 3 is formed in the motor shell and arranged around the motor shell, so that the heat exchange area is effectively increased, and the heat exchange efficiency is improved. A gap 4 is arranged between the stator and the rotor, a vent hole 2 is arranged on the outer side of the stator, the vent hole 2 is arranged on the outer side of a stator silicon steel sheet of the motor 17, and the gap 4 and the vent hole 2 are communicated with a left side cavity and a right side cavity of the motor 17.
According to another aspect of the present application, there is provided a method of cooling a refrigerated centrifugal compressor motor 17 using a refrigerated centrifugal compressor motor 17 cooling system, the method comprising the steps of:
(1) introducing a liquid refrigerant in the condenser 1 into a circulation groove 3 of a shell of the motor 17, and after the liquid refrigerant absorbs heat of a stator of the motor 17, partially gasifying the liquid refrigerant to form a gas refrigerant;
(2) the liquid refrigerant and the gas refrigerant enter a flash evaporator 9, and the liquid refrigerant and the gas refrigerant are separated by the flash evaporator 9;
(3) the separated gas refrigerant enters a left cavity of the motor 17 from the flash tank 9, then reaches a right cavity of the motor 17 through a gap 4 between a stator and a rotor of the motor 17 and a vent hole 2 on the outer side of the stator, and then returns to the evaporator 12; the separated liquid refrigerant enters the evaporator 12 from the flash evaporator 9.
Further, the step (1) is specifically as follows: the liquid refrigerant in the condenser 1 is throttled and then introduced into the circulation groove 3 of the shell of the motor 17, and the liquid refrigerant is partially gasified after absorbing the heat of the stator of the motor 17 to form a gas refrigerant.
Further, the separated liquid in step (3) is throttled and enters the evaporator 12 from the flash evaporator 9.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A refrigeration centrifugal compressor motor cooling system, comprising: a condenser, a motor, an evaporator and a flash tank; wherein,
a refrigerant outlet of the condenser is connected with a circulation groove in a shell of the motor through a motor cooling liquid inlet pipeline and used for absorbing heat of the stator in the motor; a refrigerant outlet of the circulation groove is connected with the flash tank, and the flash tank is used for separating gas and liquid of the entering refrigerant;
a gas outlet of the flash evaporator is communicated with a left cavity of the motor through a motor cooling gas supply pipeline, and a right cavity of the motor is connected with the evaporator through a motor cooling gas return pipeline; the liquid outlet of the flash tank is connected with the evaporator.
2. A motor cooling system of a refrigerating centrifugal compressor according to claim 1, wherein a motor cooling liquid inlet pipeline ball valve is arranged on the motor cooling liquid inlet pipeline; and a liquid outlet of the flash evaporator is connected with the evaporator through a secondary throttling valve.
3. A refrigeration centrifugal compressor motor cooling system as recited in claim 2 wherein a motor cooling return line valve is disposed on said motor cooling return line.
4. A refrigerated centrifugal compressor motor cooling system as recited in claim 3 wherein the flash tank is connected to the condenser by a primary throttle valve.
5. A motor cooling system of a refrigeration centrifugal compressor, according to claim 1, further comprising an air supplement pipeline connected to said flash tank, said air supplement pipeline having a multi-stage compression front stage and a multi-stage compression rear stage connected in parallel;
the front stage of the multi-stage compression is connected with the evaporator, and the rear stage of the multi-stage compression is connected with the condenser.
6. A refrigerated centrifugal compressor motor cooling system as recited in claim 1 wherein the motor includes a motor housing, a stator and a rotor disposed within the motor housing, and wherein the flow channel opens within and is disposed around the motor housing.
7. The motor cooling system of claim 6, wherein a gap is formed between the stator and the rotor, a vent hole is formed on the outer side of the stator, and the gap and the vent hole are communicated with a left side cavity and a right side cavity of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120841935.8U CN216672796U (en) | 2021-04-22 | 2021-04-22 | Motor cooling system of refrigeration centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120841935.8U CN216672796U (en) | 2021-04-22 | 2021-04-22 | Motor cooling system of refrigeration centrifugal compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216672796U true CN216672796U (en) | 2022-06-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120841935.8U Active CN216672796U (en) | 2021-04-22 | 2021-04-22 | Motor cooling system of refrigeration centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216672796U (en) |
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2021
- 2021-04-22 CN CN202120841935.8U patent/CN216672796U/en active Active
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