CN111365906A

CN111365906A - Refrigerant circulating system

Info

Publication number: CN111365906A
Application number: CN201811593720.8A
Authority: CN
Inventors: 刘华; 张治平; 刘胜; 李宏波; 陈玉辉; 钟瑞兴; 亓静利; 叶文腾
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-12-25
Filing date: 2018-12-25
Publication date: 2020-07-03
Anticipated expiration: 2038-12-25
Also published as: CN111365906B

Abstract

The invention discloses a refrigerant circulating system, relates to the field of compressors, and aims to improve the working stability of bearings inside the compressors. The refrigerant circulating system comprises a first compressor, a first diversion branch and a cooling branch. The first compressor includes a bearing and at least two stages of compression chambers. The inflow port of the first diversion branch is communicated with at least one compression cavity, and the refrigerant in the first diversion branch is used for cooling the bearing. The cooling branch exchanges heat with the first drainage branch and is used for cooling the refrigerant in the first drainage branch. Above-mentioned technical scheme adopts the cooling branch road to reduce the temperature of the inside refrigerant of first drainage branch road, and the refrigerant in the first drainage branch road is used for cooling static pressure gas bearing, and because the gas temperature is lower relatively for static pressure gas bearing's operating condition can keep, has guaranteed static pressure gas bearing job stabilization nature.

Description

Refrigerant circulating system

Technical Field

The invention relates to the field of compressors, in particular to a refrigerant circulating system.

Background

A centrifugal compressor is a compressor that compresses gas by centrifugal force, and currently, there are oil-lubricated bearings and electromagnetic bearings. The adoption of oil lubrication bearings requires the addition of an oil supply system, and lubricating oil can leak into a cooling medium to cause the pollution of the cooling medium. Furthermore, friction occurs between the lubricant and the rotor, causing energy loss. In the centrifugal compressor adopting the electromagnetic bearing, a control system of the bearing is complex, the shock resistance of the system is poor, and an additional power-off protection means is arranged to protect the bearing.

The hydrostatic gas bearing is a technique for supporting a rotor by using pressure generated by gas between the bearing and the rotor, and is an oilless bearing. The friction resistance between the gas and the rotor is small, a complex control system is not needed, and the structure is simple. Therefore, in recent years, the centrifugal compressor has also come to be applied.

The inventors have found that the static pressure gas bearing requires an external gas supply to provide the gas for the bearing to operate, and therefore whether the gas supply system is designed to reasonably directly affect the operating performance of the centrifugal compressor. The external air supply system of the existing compressor is easy to cause unstable operation of the bearing.

Disclosure of Invention

The invention provides a refrigerant circulating system which is used for improving the working stability of a bearing in a compressor.

The invention provides a refrigerant circulating system, comprising:

the first compressor comprises a bearing and at least two stages of compression cavities;

the inflow port of the first drainage branch is communicated with at least one compression cavity, and a refrigerant in the first drainage branch is used for cooling the bearing; and the cooling branch exchanges heat with the first drainage branch and is used for cooling the refrigerant in the first drainage branch.

In some embodiments, the refrigerant circulation system further includes:

the heat exchanger comprises a first branch and a second branch, the first branch is communicated with the first diversion branch, and the second branch is communicated with the cooling branch.

In some embodiments, the cooling branch is in parallel with the line between the condenser and the evaporator.

In some embodiments, the compression chambers include a first pressure stage chamber and a second pressure stage chamber, a fluid pressure within the first pressure stage chamber being unequal to a fluid pressure within the second pressure stage chamber; the inflow port of the first flow-guiding branch is communicated with the first pressure stage cavity and/or the second pressure stage cavity of the first compressor.

In some embodiments, the outlet of the first pressure stage chamber of the first compressor is provided with a first regulating valve; and/or a second regulating valve is arranged at the outlet of the second pressure stage cavity of the first compressor.

In some embodiments, the refrigerant circulation system further includes:

and the gas storage device is arranged at the downstream of the first drainage branch and is communicated with the first drainage branch.

In some embodiments, the refrigerant circulation system further includes:

and the temperature detection element is arranged on the gas storage device and used for detecting the temperature of the gas in the gas storage device.

In some embodiments, the refrigerant circulation system further includes:

and the pressure detection element is arranged on the gas storage device and used for detecting the gas pressure in the gas storage device.

In some embodiments, a third regulating valve is arranged at the outlet of the gas storage device.

In some embodiments, the refrigerant circulation system further includes:

and one end of the second drainage branch is communicated with the condenser, and the other end of the second drainage branch is communicated with the cavity where the bearing is located.

In some embodiments, the bearing comprises an air bearing.

In some embodiments, the refrigerant circulation system includes an air conditioner.

Above-mentioned technical scheme adopts the cooling branch road to go to reduce the temperature of the inside refrigerant of first drainage branch road, and the refrigerant in the first drainage branch road is used for cooling static pressure gas bearing, and because the gas temperature is lower relatively for static pressure gas bearing's operating condition can keep, has guaranteed static pressure gas bearing job stabilization nature.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic diagram of a refrigerant circulation system according to an embodiment of the present invention;

fig. 2 is a schematic view of a refrigerant cycle system according to another embodiment of the present invention;

fig. 3 is a schematic diagram of a refrigerant circulation system according to another embodiment of the present invention.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 3.

The embodiment of the invention provides a refrigerant circulating system which comprises a first compressor 1, a first diversion branch 2 and a cooling branch 3. The first compressor 1 comprises bearings and at least two stages of compression chambers. The inflow port of the first drainage branch 2 is communicated with the compression cavity, and a refrigerant in the first drainage branch 2 is used for cooling the bearing. The cooling branch 3 exchanges heat with the first diversion branch 2 and is used for cooling the refrigerant in the first diversion branch 2.

The bearings are, for example, air-bearing, in particular hydrostatic air bearings. The static pressure gas bearing is an oilless bearing, does not need lubricating oil, and avoids pollution caused by the lubricating oil.

The following describes the optional structure of the refrigerant circulation system in three ways, taking the first compressor 1 including two compression cavities, i.e. the first pressure stage cavity 101 and the second pressure stage cavity 102 as an example. The first branch flow leading 2 is used for taking liquid from the first pressure stage cavity 101 independently, and the first branch flow leading 2 is used for taking liquid from the second pressure stage cavity 102 independently. The first tapping branch 2 draws fluid from both the first pressure stage chamber 101 and the second pressure stage chamber 102.

Referring to fig. 1, in some embodiments, the first compressor 1 includes two stages of compression chambers, a first pressure stage chamber 101 and a second pressure stage chamber 102, respectively. In operation, the pressure of the gas in the first pressure stage chamber 101 is higher than the pressure of the gas in the second pressure stage chamber 102.

Referring to fig. 1, in some embodiments, the first flow-guiding branch 2a leads out the refrigerant from the first pressure stage chamber 101, that is, an inlet of the first flow-guiding branch 2a is communicated with the first pressure stage chamber 101 of the first compressor 1. The refrigerant in the first branch conduit 2a is subsequently used for cooling the bearing in the first compressor 1.

Referring to fig. 1, in some embodiments, the refrigerant circulation system further includes a heat exchanger 4, where the heat exchanger 4 includes a first branch and a second branch, the first branch is communicated with the first diversion branch 2a, and the second branch is communicated with the cooling branch 3. The first branch is provided with a third check valve 18 at a position downstream of the heat exchanger 4.

The heat exchanger 4 is for example a plate heat exchanger. The temperature of the refrigerant in the cooling branch 3 is lower than that of the refrigerant in the first diversion branch 2 a. The cooling branch 3 leads out the refrigerant from the outlet of the condenser 14, or leads out the refrigerant in the condenser 14 after throttling by the throttling device 11.

Referring to fig. 1, in some embodiments, the cooling branch 3 is in parallel with the line between the condenser 14 and the evaporator 13. The cooling branch 3 is provided with a fourth regulating valve 19 to control parameters such as the on-off state and the refrigerant flow of the cooling branch 3.

Referring to fig. 1, after the refrigerant coming out of the condenser 14 is throttled by the throttling device 11, a part of the refrigerant flows to the evaporator 13, and the other part of the refrigerant enters the cooling branch 3, then flows to the second branch of the heat exchanger 4, and then flows to the evaporator 13.

Referring to fig. 1, in some embodiments, the first branch flow guiding path 2a is provided with a first adjusting valve 5 to adjust parameters such as flow rate and pressure of the refrigerant in the first branch flow guiding path 2 a.

In order to prevent the return of the refrigerant, the first branch line 2a is also provided with a first non-return valve 12, the first non-return valve 12 being located, for example, upstream of the first regulating valve 5.

Referring to fig. 1, in some embodiments, the refrigerant circulation system further includes an air storage device 7, and the air storage device 7 is disposed downstream of the first branch flow guiding path 2a and is communicated with the first branch flow guiding path 2 a. The supercooled refrigerant is stored in the gas storage 7 to cool the bearing when necessary. And a third regulating valve 17 is arranged at the downstream of the gas storage device 7, the third regulating valve 17 is opened, and the refrigerant in the gas storage device 7 enters the cavity where the bearing is positioned so as to cool the bearing. The third regulating valve 17 is closed, and the refrigerant in the air storage device 7 does not flow out.

Referring to fig. 1, in some embodiments, the refrigerant circulation system further includes a temperature detecting element 8, and the temperature detecting element 8 is disposed in the gas storage device 7 and is configured to detect a temperature of the gas in the gas storage device 7. The temperature detection element 8 includes a temperature sensor or the like.

In some embodiments, the refrigerant circulation system further includes a pressure detecting element 9, and the pressure detecting element 9 is disposed in the gas storage device 7 and is configured to detect a gas pressure in the gas storage device 7. The pressure detection element 9 includes a pressure sensor or the like.

The refrigerant circulation system comprises two working states: start-stop state and normal working state. The refrigerant circulating system is in a normal working state, and the bearing is cooled by the first diversion branch 2 a. The refrigerant circulation system is in a start-stop stage, which lasts for a short time, and the bearing is cooled by a second diversion branch 10 described below.

Referring to fig. 1, in some embodiments, the refrigerant circulation system further includes a second branch flow guiding device 10, one end of the second branch flow guiding device 10 is communicated with the condenser 14, and the other end of the second branch flow guiding device 10 is communicated with the cavity where the bearing is located. Or, the refrigerant circulation system further includes a second diversion branch 10, one end of the second diversion branch 10 is communicated with the condenser 14, and the other end of the second diversion branch 10 is communicated with the gas storage device 7, as shown in fig. 1.

Referring to fig. 1, a second compressor 15 is disposed in the second diversion branch 10, and a gaseous refrigerant is led out from the condenser 14, and flows to the gas storage device 7 after passing through the second compressor 15.

Referring to fig. 1, a fourth check valve 20 is further disposed in the second branch line 10 to prevent refrigerant from flowing back and to control whether the second branch line 10 is in a working state. When the first compressor 1 is in the start-stop stage, the second diversion branch 10 is in the conducting state. In this state, the first branch drain 2a does not operate and is in a disconnected state. When the first compressor 1 is in a normal working state, the first diversion branch 2a is in a conducting state. In this state, the second drainage branch 10 does not work and is in a disconnected state.

In some embodiments, the cooling medium circulation system includes an air conditioner.

Referring to fig. 2, another diversion mode of the first diversion branch 2 is described below.

The embodiment of the invention provides a refrigerant circulating system which comprises a first compressor 1, a first diversion branch 2b and a cooling branch 3. The first compressor 1 comprises bearings and at least two stages of compression chambers. The inflow port of the first diversion branch 2b is communicated with the compression cavity, and a refrigerant in the first diversion branch 2b is used for cooling the bearing. The cooling branch 3 exchanges heat with the first diversion branch 2b and is used for cooling the refrigerant in the first diversion branch 2 b.

In some embodiments, the first compressor 1 comprises two stages of compression chambers, a first pressure stage chamber 101 and a second pressure stage chamber 102, respectively. In operation, the pressure of the gas in the first pressure stage chamber 101 is higher than the pressure of the gas in the second pressure stage chamber 102.

Referring to fig. 2, in some embodiments, the first flow-guiding branch 2b leads out the refrigerant from the second pressure stage chamber 102, that is, an inlet of the first flow-guiding branch 2b is communicated with the second pressure stage chamber 102 of the first compressor 1. The refrigerant in the first branch conduit 2b is subsequently used for cooling the bearing in the first compressor 1.

In some embodiments, the refrigerant circulation system further includes a heat exchanger 4, and the heat exchanger 4 includes a first branch communicating with the first diversion branch 2b and a second branch communicating with the cooling branch 3. The first branch is provided with a third check valve 18 at a position downstream of the heat exchanger 4.

The heat exchanger 4 is for example a plate heat exchanger 4. The temperature of the refrigerant in the cooling branch 3 is lower than that of the refrigerant in the first diversion branch 2 b. The cooling branch 3 leads out the refrigerant from the outlet of the condenser 14, or leads out the refrigerant in the condenser 14 after throttling by the throttling device 11.

Referring to fig. 2, in some embodiments, the cooling branch 3 is in parallel with the line between the condenser 14 and the evaporator 13. The cooling branch 3 is provided with a fourth regulating valve 19 to control the on-off state of the cooling branch 3.

Referring to fig. 2, after the refrigerant from the condenser 14 is throttled by the throttling device 11, a part of the refrigerant flows to the evaporator 13, and the other part of the refrigerant enters the cooling branch 3, and then flows to the second branch of the heat exchanger 4, and then flows to the evaporator 13.

In some embodiments, the first branch flow guiding device 2b is provided with a second regulating valve 6 to regulate parameters such as flow rate and pressure of the refrigerant in the first branch flow guiding device 2 b.

In order to prevent the return of the refrigerant, the first branch line 2b is also provided with a second non-return valve 16, the second non-return valve 16 being located, for example, upstream of the second regulating valve 6.

In some embodiments, the refrigerant circulation system further includes an air storage device 7, and the air storage device 7 is disposed downstream of the first branch flow guiding device 2b and is communicated with the first branch flow guiding device 2 b. The supercooled refrigerant is stored in the gas storage 7 to cool the bearing when necessary. And a third regulating valve 17 is arranged at the downstream of the gas storage device 7, the third regulating valve 17 is opened, and the refrigerant in the gas storage device 7 enters the cavity where the bearing is positioned so as to cool the bearing. The third regulating valve 17 is closed, and the refrigerant in the air storage device 7 does not flow out.

Referring to fig. 2, in some embodiments, the refrigerant circulation system further includes a temperature detecting element 8, and the temperature detecting element 8 is disposed in the gas storage device 7 and is configured to detect a temperature of the gas in the gas storage device 7. The temperature detection element 8 includes a temperature sensor or the like.

The refrigerant circulation system comprises two working states: start-stop state and normal working state. The refrigerant circulating system is in a normal working state, and the bearing is cooled by the first drainage branch 2 b. The refrigerant circulation system is in a start-stop stage, which lasts for a short time, and the bearing is cooled by a second diversion branch 10 described below.

In some embodiments, the refrigerant circulation system further includes a second branch flow guiding device 10, one end of the second branch flow guiding device 10 is communicated with the condenser 14, and the other end of the second branch flow guiding device 10 is communicated with the cavity where the bearing is located. Or, the refrigerant circulation system further includes a second diversion branch 10, one end of the second diversion branch 10 is communicated with the condenser 14, and the other end of the second diversion branch 10 is communicated with the gas storage device 7, as shown in fig. 2.

The second diversion branch 10 is provided with a second compressor 15, a gaseous refrigerant is led out from the condenser 14, and the gaseous refrigerant flows to the gas storage device 7 after passing through the second compressor 15.

The second branch flow guiding circuit 10 is further provided with a fourth check valve 20 to prevent the refrigerant from flowing back and to control whether the second branch flow guiding circuit 10 is in a working state. When the first compressor 1 is in the start-stop state, the second diversion branch 10 is in the conduction state. In this state, the first branch flow guide 2b does not operate and is in a disconnected state. When the first compressor 1 is in a normal working state, the first diversion branch 2b is in a conducting state. In this state, the second drainage branch 10 does not work and is in a disconnected state.

Referring to fig. 3, yet another drainage pattern for the first drainage branch 2 is described.

Referring to fig. 3, in some embodiments, the first drainage branch 2 comprises two, a first drainage branch 2a and a first drainage branch 2 b.

The first flow-guiding branch 2a leads out the refrigerant from the first pressure stage cavity 101, that is, the inlet of the first flow-guiding branch 2a is communicated with the second pressure stage cavity 102 of the first compressor 1. The first flow-guiding branch 2b leads out the refrigerant from the second pressure stage cavity 102, that is, the inlet of the first flow-guiding branch 2b is communicated with the second pressure stage cavity 102 of the first compressor 1. The outflow openings of the first and

second flow branches

2a, 2b merge.

In some embodiments, the refrigerant circulation system further includes a heat exchanger 4, the heat exchanger 4 includes a first branch and a second branch, the first branch is communicated with the outflow ports of the first diversion branch 2a and the first diversion branch 2b, and the second branch is communicated with the cooling branch 3. The first branch is provided with a third check valve 18 at a position downstream of the heat exchanger 4.

The heat exchanger 4 is for example a plate heat exchanger.

In some embodiments, the cooling branch 3 is in parallel with the line between the condenser 14 and the evaporator 13. The cooling branch 3 is provided with a fourth regulating valve 19 to control the on-off state of the cooling branch 3.

Referring to fig. 3, the refrigerant from the condenser 14 is throttled by the throttle device 11, and then flows partially to the evaporator 13. The other part enters the cooling branch 3 and then flows to the second branch of the heat exchanger 4 and then to the evaporator 13.

In some embodiments, the first branch flow guiding device 2a is provided with a first adjusting valve 5 to adjust parameters of flow rate, pressure, temperature, etc. of the refrigerant in the first branch flow guiding device 2 a. The first diversion branch 2b is provided with a second regulating valve 6 to regulate parameters such as flow, pressure, temperature and the like of the refrigerant in the first diversion branch 2 b.

In order to prevent a return flow of refrigerant in the first branch line 2a, the first branch line 2a is also provided with a first non-return valve 12, the first non-return valve 12 being located, for example, upstream of the first regulating valve 5. In order to prevent a return flow of refrigerant in the first branch line 2b, the first branch line 2b is also provided with a second non-return valve 16, the first non-return valve 16 being located, for example, upstream of the second regulating valve 6.

In some embodiments, the refrigerant circulation system further includes an air storage device 7, and the air storage device 7 is disposed downstream of the first branch flow guiding device 2a and the first branch flow guiding device 2b, and is communicated with both the first branch flow guiding device 2a and the first branch flow guiding device 2 b. The supercooled refrigerant is stored in the gas storage 7 to cool the bearing when necessary.

Referring to fig. 3, in some embodiments, the refrigerant circulation system further includes a temperature detecting element 8, and the temperature detecting element 8 is disposed in the gas storage device 7 and is configured to detect a temperature of the gas in the gas storage device 7. The temperature detection element 8 includes a temperature sensor or the like.

In some embodiments, the refrigerant circulation system further includes a second branch flow guiding device 10, one end of the second branch flow guiding device 10 is communicated with the condenser 14, and the other end of the second branch flow guiding device 10 is communicated with the cavity where the bearing is located. The second tapping branch 10 is used for cooling the bearing during the start-stop phase.

Or, the refrigerant circulation system further includes a second diversion branch 10, one end of the second diversion branch 10 is communicated with the condenser 14, and the other end of the second diversion branch 10 is communicated with the gas storage device 7, as shown in fig. 3. The second tapping branch 10 is used for cooling the bearing during the start-stop phase.

The second branch flow guiding circuit 10 is further provided with a fourth check valve 20 to prevent the refrigerant from flowing back and to control whether the second branch flow guiding circuit 10 is in a working state. When the first compressor 1 is in the start-stop stage, the second diversion branch 10 is in the conducting state. In this state, the first drainage branch 2a and the first drainage branch 2b do not work, and are in a disconnected state. When the first compressor 1 is in a normal working stage, at least one of the first diversion branch 2a and the first diversion branch 2b is in a conducting state. In this state, the second drainage branch 10 does not work and is in a disconnected state.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigerant circulation system, comprising:

a first compressor (1) comprising a bearing and at least two stages of compression chambers;

the inflow port of the first diversion branch (2) is communicated with at least one compression cavity, and a refrigerant in the first diversion branch (2) is used for cooling the bearing; and

and the cooling branch (3) exchanges heat with the first diversion branch (2) and is used for cooling the refrigerant in the first diversion branch (2).

2. The refrigerant circulation system as claimed in claim 1, further comprising:

the heat exchanger (4) comprises a first branch and a second branch, the first branch is communicated with the first diversion branch (2), and the second branch is communicated with the cooling branch (3).

3. Refrigerant circulation system according to claim 1, characterized in that the cooling branch (3) is connected in parallel with the line between the condenser (14) and the evaporator (13).

4. The refrigerant circulation system as claimed in claim 1, wherein the compression chamber comprises a first pressure stage chamber (101) and a second pressure stage chamber (102), and a fluid pressure in the first pressure stage chamber (101) is not equal to a fluid pressure in the second pressure stage chamber (102); the inflow opening of the first flow-guiding branch (2) is in communication with a first pressure stage chamber (101) and/or a second pressure stage chamber (102) of the first compressor (1).

5. The refrigerant circulation system as claimed in claim 4, wherein the outlet of the first pressure stage chamber (101) of the first compressor (1) is provided with a first regulating valve (5); and/or a second regulating valve (6) is arranged at the outlet of the second pressure stage cavity (102) of the first compressor (1).

6. The refrigerant circulation system as claimed in claim 1, further comprising:

and the gas storage device (7) is arranged at the downstream of the first drainage branch (2) and is communicated with the first drainage branch (2).

7. The coolant circulation system according to claim 6, further comprising:

and the temperature detection element (8) is arranged on the gas storage device (7) and is used for detecting the gas temperature in the gas storage device (7).

8. The coolant circulation system according to claim 6, further comprising:

and the pressure detection element (9) is arranged on the gas storage device (7) and is used for detecting the gas pressure in the gas storage device (7).

9. The cooling medium circulation system according to claim 6, wherein a third regulating valve (17) is provided at the outlet of the gas storage device (7).

10. The refrigerant circulation system as claimed in claim 1, further comprising:

and one end of the second diversion branch (10) is communicated with the condenser (14), and the other end of the second diversion branch is communicated with the cavity where the bearing is located.

11. Refrigerant circulation system according to claim 10, characterized in that the second tapping branch (10) is provided with a second compressor (15).

12. The coolant circulation system according to claim 6, further comprising:

and one end of the second drainage branch (10) is communicated with the condenser (14), and the other end of the second drainage branch is communicated with the gas storage device (7).

13. The coolant circulation system of claim 1, wherein the bearing comprises an air bearing.

14. The refrigerant circulation system as claimed in claim 1, wherein the refrigerant circulation system comprises an air conditioner.