WO2023088043A1 - Compressor liquid supply system - Google Patents

Abstract

The compressor liquid supply system, comprising: a first liquid taking pipeline (21), having one end communicated with a liquid supply port of an evaporator (13) for taking a liquid refrigerant from the evaporator (13); a second liquid taking pipeline (22), having one end communicated with a liquid supply portion of a condenser (12) for taking a liquid refrigerant from the condenser (12); a liquid supply pipeline (23), the other end of the first liquid taking pipeline (21) and the other end of the second liquid taking pipeline (22) being both communicated with one end of the liquid supply pipeline (23), and the other end of the liquid supply pipeline (23) being communicated with the inlet of a compressor (11); a pressurizing device (25) provided on the liquid supply pipeline (23) for regulating the pressure of the refrigerant in the liquid supply pipeline (23); and a parallel pipeline (24), both ends of which are communicated with the liquid supply pipeline (23) and are connected in parallel to the pressurizing device (25). The compressor liquid supply system reduces the use of a gear pump by providing the parallel pipeline (24), and reduces the energy consumption of the compressor.

Description

Compressor liquid supply system

This application is based on a Chinese patent application with application number 202111385085.6 and a filing date of November 22, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to the technical field of compressors, for example, to a liquid supply system for a compressor.

Background technique

At present, in the refrigeration system of the air conditioner, the compressor gradually starts to use the air suspension compressor, and the air supply method to the compressor is mostly: the refrigerant in the main refrigerant circuit of the refrigeration system is pumped through the pipeline by using the liquid supply pump To the air supply tank, the refrigerant is heated at high temperature in the air supply tank and evaporated into a high-pressure gaseous refrigerant. After being discharged from the air supply tank, it is directly sent to the gas bearing gap of the compressor through the pipeline to support the rotor.

The prior art discloses a motor cooling system for an air suspension compressor. The motor cooling system includes: a gas bearing air supply unit and a first pipeline. The gas bearing air supply unit includes an air supply tank, the air supply tank includes a refrigerant inlet, a gas outlet and a liquid refrigerant outlet, the refrigerant inlet is connected to the refrigerant in the refrigeration system where the compressor is located, and the gas outlet is connected to the The gas supply port of the gas bearing of the compressor is connected. In the gas supply tank, the liquid refrigerant is heated and evaporated into a gaseous refrigerant, and then discharged from the gas outlet of the gas supply tank, which can provide gas with stable pressure for the gas bearing of the compressor. The refrigerant ensures the stability of the compressor operation; the two ports of the first pipeline communicate with the liquid refrigerant outlet of the air supply tank and the motor coolant supply port of the compressor respectively.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in related technologies:

In the process of supplying liquid refrigerant to the compressor, the liquid refrigerant needs to be heated and evaporated into gas refrigerant, and then discharged to the compressor from the gas outlet of the air supply tank to supply gas to the gas bearing of the compressor. During the process of heating and evaporating the refrigerant into a gaseous refrigerant, the operating energy consumption of the compressor will be increased.

Contents of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. The summary is not intended to be an extensive overview nor to identify key/important elements or to delineate the scope of these embodiments, but rather serves as a prelude to the detailed description that follows.

The embodiment of the present disclosure provides a compressor liquid supply system to solve the technical problem of how to reduce the energy consumption of the compressor.

An embodiment of the present disclosure provides a liquid supply system for a compressor, comprising: a first liquid intake pipeline, one end of which communicates with the liquid supply port of the evaporator, and is used to extract liquid refrigerant from the evaporator; A liquid pipeline, one end of which is in communication with the liquid supply port of the condenser, for taking liquid refrigerant from the condenser; a liquid supply pipeline, the other end of the first liquid extraction pipeline is connected to the second extraction pipeline The other end of the liquid pipeline is connected with one end of the liquid supply pipeline, and the other end of the liquid supply pipeline is connected with the inlet of the compressor for connecting the first liquid extraction pipeline and The liquid refrigerant in the second liquid-taking pipeline is delivered to the inlet of the compressor; the pressurizing device is arranged in the liquid supply pipeline for adjusting the pressure of the refrigerant in the liquid supply pipeline; A pipeline, both ends of the parallel pipeline communicate with the liquid supply pipeline, and are connected in parallel with the pressurizing device.

In some embodiments, the liquid supply system for the compressor further includes: a second flow regulating valve, disposed on the first liquid extraction pipeline, for adjusting the refrigerant flow rate of the first liquid extraction pipeline.

In some embodiments, the liquid supply system for the compressor further includes: a third flow regulating valve, disposed on the second liquid extraction pipeline, for adjusting the flow rate of the refrigerant in the second liquid extraction pipeline.

In some embodiments, the liquid supply system for the compressor further includes: a first flow regulating valve, disposed on the parallel pipeline, and used to adjust the refrigerant flow of the parallel pipeline.

In some embodiments, the liquid supply system of the compressor further includes: a one-way valve, arranged in the first liquid extraction pipeline, for preventing the refrigerant in the first liquid extraction pipeline from flowing back.

In some embodiments, a bearing air supply pipeline is provided inside the compressor, the bearing air supply pipeline communicates with the compressor inlet, and the bearing air supply pipeline is used to supply air to the bearings of the compressor.

In some embodiments, a throttling assembly is provided in the bearing air supply pipeline, and the throttling assembly is used to convert liquid refrigerant into gas refrigerant.

In some embodiments, the compressor liquid supply system further includes: a pressure detection device, arranged in the refrigerant circulation circuit, for obtaining the pressure values of the inlet of the compressor and the outlet of the compressor; a controller, connected with the The pressure detection device, the pressurizing device, the first flow regulating valve, the second flow regulating valve and the third flow regulating valve are all connected and configured to receive the pressure of the compressor inlet and the compressor outlet value, calculate the pressure difference between the compressor inlet and the compressor outlet, and control the start and stop of the pressurizing device, the At least one of the opening degree, the opening degree of the second flow regulating valve, and the opening degree of the third flow regulating valve.

In some embodiments, the controller is configured to: when the pressure difference is greater than the maximum value of the preset pressure range, control the second flow regulating valve to reduce the opening and/or the third Decrease the opening of the flow regulating valve; obtain the adjusted pressure difference; if the adjusted pressure difference deviates from the preset pressure range, adjust the opening of the first flow regulating valve until the adjusted pressure difference within the preset pressure range.

In some embodiments, the controller is further configured to: when the pressure difference is less than the minimum value of the preset pressure range, start the pressurizing device, and the pressurizing device runs for a preset time or The pressurized pressure of the liquid refrigerant in the liquid supply pipeline is increased to the preset boost pressure, the pressurization device is closed, and the opening of the first flow regulating valve is adjusted until the adjusted pressure difference is at the preset pressure. Within the preset pressure range, the difference between the preset boost pressure and the preset pressure range is smaller than the preset difference.

The compressor liquid supply system provided by the embodiments of the present disclosure can achieve the following technical effects:

By setting the first liquid extraction pipeline, the second liquid extraction pipeline and the liquid supply pipeline, the high temperature and high pressure liquid refrigerant in the condenser and the low temperature and low pressure liquid refrigerant in the evaporator can be mixed and supplied to the compressor to meet the According to the operation requirements of various working conditions of the compressor, the refrigerant in the liquid supply pipeline can be quickly pressurized by setting a pressurizing device to ensure that the pressure of the refrigerant in the liquid supply pipeline meets the operation requirements of the compressor. The pipeline can flow along the parallel pipeline when the refrigerant does not need to be pressurized, which effectively reduces the use of gear pumps and reduces the energy consumption of the compressor liquid supply system.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by the corresponding drawings, and these exemplifications and drawings do not constitute a limitation to the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings are not limited to scale and in which:

Fig. 1 is a schematic structural diagram of a compressor liquid supply system provided by an embodiment of the present disclosure;

Fig. 2 is a schematic cross-sectional structure diagram of a compressor provided by an embodiment of the present disclosure;

Fig. 3 is a schematic diagram showing the enlarged structure of part A in Fig. 2;

Fig. 4 is a schematic flowchart of a control method for a compressor liquid supply system provided by an embodiment of the present disclosure;

Fig. 5 is a schematic flowchart of another control method for a compressor liquid supply system provided by an embodiment of the present disclosure;

Fig. 6 is a schematic flowchart of another control method for a compressor liquid supply system provided by an embodiment of the present disclosure.

Reference signs:

10: Refrigerant circulation circuit; 11: Compressor; 111: Bearing air supply pipeline; 112: Throttle assembly; 113: Bearing; 12: Condenser; 13: Evaporator; 21: First liquid extraction pipeline; 22: Second Two liquid intake pipelines; 23: liquid supply pipeline; 24: parallel pipeline; 25: pressurizing device; 26: first flow regulating valve; 27: second flow regulating valve; 28: third flow regulating valve; 29 : one-way valve; 30: air return pipeline; 31: pressure detection device; 311: first pressure sensor; 312: second pressure sensor; 32: filter.

Detailed ways

In order to understand the characteristics and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

The terms "first", "second" and the like in the description and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances so as to facilitate the embodiments of the disclosed embodiments described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion.

Unless stated otherwise, the term "plurality" means two or more.

In the embodiments of the present disclosure, the character "/" indicates that the preceding and following objects are an "or" relationship. For example, A/B means: A or B.

The term "and/or" is an associative relationship describing objects, indicating that there can be three relationships. For example, A and/or B means: A or B, or, A and B, these three relationships.

FIG. 1 to FIG. 3 show optional implementation structures of this embodiment, and the direction of the arrow in the figure is the flow direction of the refrigerant.

The embodiment of the present disclosure provides a compressor liquid supply system applied to the refrigerant circulation circuit 10 formed by sequentially connecting the compressor 11, the condenser 12, and the evaporator 13. The compressor liquid supply system includes: a first liquid extraction pipeline 21, A second liquid extraction pipeline 22 , a liquid supply pipeline 23 , a pressurizing device 25 , a parallel pipeline 24 and a first flow regulating valve 26 .

The refrigerant circulation circuit 10 includes an air suspension compressor 11 , an evaporator 13 and a condenser 12 connected in sequence, and the above components are connected by pipelines to form the refrigerant circulation circuit 10 . Structural parts such as check valve 29, flow control device (angle valve), electronic expansion valve, filter 32 and fluid monitoring device are also arranged on the pipeline of refrigerant circulation circuit 10, and the setting position and setting method of the structural parts are conventional. The means are enough, so I won’t repeat them here.

When the air suspension unit system is working, the evaporator 13 transmits the low-temperature and low-pressure gaseous refrigerant to the compressor 11 through the connecting pipeline, and the compressor 11 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and then passes the connecting pipeline to The high-temperature and high-pressure gaseous refrigerant is delivered to the condenser 12, and the high-temperature and high-pressure gaseous refrigerant becomes a normal-temperature and high-pressure liquid refrigerant after the condenser 12 dissipates heat.

The refrigerant circulation circuit 10 also includes a decompression component, and the decompression component communicates with the evaporator 13 . The liquid refrigerant at normal temperature and high pressure returns to the evaporator 13 after passing through the pipeline. Wherein, the room-temperature and high-pressure liquid refrigerant reaches the evaporator 13 from the decompression component, and the space suddenly increases, the pressure decreases, and the liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant will vaporize in the evaporator 13 and become a low-temperature and low-pressure gaseous refrigerant. After that, the evaporator 13 transmits the low-temperature and low-pressure gaseous refrigerant to the compressor 11 again through the pipeline to complete the refrigeration cycle.

One end of the first liquid extraction pipeline 21 communicates with the liquid supply port of the evaporator 13 for taking liquid refrigerant from the evaporator 13. In this way, the low temperature and low pressure liquid refrigerant in the evaporator 13 can be made Line 21 flows out.

One end of the second liquid-taking pipeline 22 is connected with the liquid supply port of the condenser 12, and is used to take liquid refrigerant from the condenser 12. In this way, the high-temperature and high-pressure liquid refrigerant in the condenser 12 can be made Line 22 flows out.

The other end of the first liquid extraction pipeline 21 and the other end of the second liquid extraction pipeline 22 are all connected with one end of the liquid supply pipeline 23, and the other end of the liquid supply pipeline 23 is connected with the inlet of the compressor 11, It is used to mix the liquid refrigerant in the first liquid extraction pipeline 21 and the second liquid extraction pipeline 22 and deliver them to the inlet of the compressor 11 . In this way, the liquid supply pipeline 23 can mix the low-temperature and low-pressure liquid refrigerant in the first liquid-taking pipeline 21 with the high-temperature and high-pressure liquid refrigerant in the second liquid-taking pipeline 22, and deliver the mixed refrigerant to the compressor. The inside of 11 ensures the work of compressor 11.

The pressurizing device 25 is arranged in the liquid supply pipeline 23, and is used to control the pressure of the refrigerant in the liquid supply pipeline 23. In this way, when the pressure of the mixed refrigerant still cannot meet the operation requirements of the compressor bearing 113, the pressure can be turned on to increase the pressure. The pressurizing device 25 quickly and directly increases the pressure of the refrigerant passing through the pressurizing device 25 in the liquid supply pipeline 23 to ensure that the liquid supply pipeline 23 can provide the refrigerant that meets the operation requirements of the compressor bearing 113 .

Both ends of the parallel pipeline 24 are in communication with the liquid supply pipeline 23 , and the parallel pipeline 24 is connected in parallel with the pressurizing device 25 . In this way, when the pressure of the mixed refrigerant meets the operating requirements of the bearings of the compressor 11, it can directly flow into the inlet of the compressor 11 through the parallel pipeline 24 without going through the pressurizing device 25, which saves the energy consumption of the liquid supply pipeline 23 .

Optionally, the first flow regulating valve 26 is disposed on the parallel pipeline 24 and is used to adjust the refrigerant flow rate of the parallel pipeline 24 . In this way, when the pressure of the mixed refrigerant exceeds the operating requirements of the bearings of the compressor 11, the pressure of the refrigerant in the parallel pipeline 24 can be adjusted by controlling the opening of the first flow regulating valve 26. At this time, the first flow regulating valve 26 can It plays the role of throttling, thereby ensuring the normal operation of the compressor bearing.

Adopting the embodiment of the present disclosure, by setting the first liquid extraction pipeline 21, the second liquid extraction pipeline 22 and the liquid supply pipeline 23, the low temperature and low pressure liquid refrigerant in the evaporator 13 can be combined with the high temperature in the condenser 12. The high-pressure liquid refrigerant is mixed and delivered to the inlet of the compressor 11. By setting the pressurizing device 25, the parallel pipeline 24 and the first flow regulating valve 26, when the pressure of the refrigerant in the liquid supply pipeline 23 is lower than the requirement of the compressor 11 When the refrigerant pressure in the liquid supply pipeline 23 can be adjusted through the pressurizing device 25, when the refrigerant pressure in the liquid supply pipeline 23 is higher than the requirement of the compressor 11, the liquid supply can be adjusted by adjusting the first flow regulating valve 26 The pressure of the refrigerant in the pipeline 23 enables the liquid supply pipeline 23 to supply the compressor 11 with refrigerant that meets the operation requirements of the compressor. Compared with the traditional technique of supplying air to the compressor by heating the air supply tank, the present application omits the air supply tank and the heating device, effectively saving the energy consumption of the compressor system.

In some embodiments, the compressor liquid supply system further includes a second flow regulating valve 27 . The second flow regulating valve 27 is disposed on the first liquid extraction pipeline 21 for adjusting the refrigerant flow rate of the first liquid extraction pipeline 21 . In this way, by controlling the opening and closing of the second flow regulating valve 27, the outflow of the low-temperature and low-pressure liquid refrigerant in the evaporator 13 can be controlled, and the pressure of the refrigerant in the liquid supply pipeline 23 can be adjusted.

Optionally, the second flow regulating valve 27 is a self-operated flow regulating valve. In this way, the second flow regulating valve 27 can automatically maintain a constant flow through the second flow regulating valve 27 when the pressure difference between the inlet and outlet of the second flow regulating valve 27 changes, so as to achieve the purpose of precisely regulating the flow.

In some embodiments, the compressor liquid supply system further includes a third flow regulating valve 28 , the third flow regulating valve 28 is disposed on the second liquid extraction pipeline 22 for adjusting the refrigerant flow rate of the second liquid extraction pipeline 22 . In this way, by controlling the opening and closing of the third flow regulating valve 28, the outflow of high-temperature and high-pressure liquid refrigerant in the condenser 12 can be controlled, and the refrigerant pressure of the liquid supply pipeline 23 can be adjusted.

Optionally, the third flow regulating valve 28 is a self-operated flow regulating valve. In this way, the third flow regulating valve 28 can automatically maintain a constant flow through the third flow regulating valve 28 when the pressure difference between the inlet and outlet of the third flow regulating valve 28 changes, so as to achieve the purpose of precisely regulating the flow.

Optionally, the regulating valve of the second flow valve is closed, and the regulating valve of the third flow is opened. In this way, when the pressure of the refrigerant in the second liquid-taking pipeline meets the liquid supply requirement, only the second liquid-taking pipeline can be opened, thereby reducing the number of units to be controlled and improving the reliability of control.

Optionally, the second flow regulating valve is opened, and the third flow regulating valve is closed. In this way, when the pressure of the refrigerant in the first liquid-taking pipeline meets the liquid supply requirement, only the second liquid-taking pipeline can be opened, thereby reducing the number of units to be controlled and improving the reliability of control.

In some embodiments, the liquid supply system of the compressor further includes a one-way valve 29 , which is arranged on the first liquid extraction pipeline 21 to prevent the refrigerant in the first liquid extraction pipeline 21 from flowing back.

Because the refrigerant in the pipeline follows the flow law from high pressure to low pressure, at the intersection of the first liquid extraction pipeline 21, the second liquid extraction pipeline 22 and the liquid supply pipeline 23, the second liquid extraction pipeline 22 The pressure of the high-pressure refrigerant mixed with the refrigerant in the liquid supply line 23 is greater than the pressure of the refrigerant in the first liquid intake line 21, and there will be a tendency to flow to the first liquid intake line 21, causing the refrigerant to flow back into evaporation The problem of the device 13 will further affect the work of the entire refrigerant circulation loop 10.

In some embodiments, the compressor 11 is provided with a bearing air supply pipeline 111 , the bearing air supply pipeline 111 communicates with the inlet of the compressor, and the bearing air supply pipeline 111 is used to supply air to the compressor bearing 113 . In this way, the bearing air supply pipeline 111 communicates with the compressor inlet, so that the refrigerant flowing into the compressor 11 from the liquid supply pipeline 23 can flow to the position where the compressor bearing 113 is located along the bearing air supply pipeline 111 to maintain the compressor. Operation of the bearing 113.

In some embodiments, a throttling assembly 112 is disposed in the bearing air supply pipeline 111, and the throttling assembly 112 is used to convert liquid refrigerant into gas refrigerant.

In this way, the liquid refrigerant flowing from the liquid supply pipeline 23 into the bearing air supply pipeline 111 is throttled by the throttling assembly 112 and becomes a gaseous refrigerant, and the gaseous refrigerant is supplied to the compressor bearing to make the bearing of the compressor 11 suspend. The throttling assembly 112 is set in the bearing air supply pipeline 111. Compared with the traditional arrangement of the air supply tank and the heating device, the setting of the heating device and the air supply tank can be omitted, and the components of the air suspension compressor air supply system can be reduced. , while improving system reliability and reducing system energy consumption.

Optionally, the throttle assembly 112 includes micro-orifices.

Optionally, the throttling assembly 112 includes a bearing porous media component.

In some embodiments, the liquid supply system for the compressor further includes a gas return pipeline 30, one end of the gas return pipeline 30 communicates with the outlet of the compressor 11, the other end of the gas return pipeline 30 communicates with the refrigerant circulation circuit 10, and the gas return pipeline 30 communicates with the outlet of the compressor 11. The passage 30 is used to discharge the refrigerant flowing into the compressor back to the refrigerant circulation circuit 10 .

Optionally, one end of the air return pipeline 30 is connected to the outlet of the compressor 11 , and the other end of the air return pipeline 30 is connected to the gaseous refrigerant area of the evaporator 13 . In this way, the refrigerant flowing into the compressor 11 can be made to flow back to the evaporator 13 along the air return line 30 , because the refrigerant flowing into the compressor 11 does work inside the compressor 11 , the pressure of the refrigerant drops, and there is also refrigerant in the evaporator 13 . A large amount of low-pressure refrigerant, the amount of refrigerant transported back to the evaporator 13 by the return air pipeline 30 is relatively small relative to the total amount of refrigerant in the evaporator 13, which will not cause a large change in the pressure of the refrigerant in the evaporator 13, thus The impact of the return air pipeline 30 on the normal operation of the refrigerant circulation circuit 10 is reduced. In addition, the loss of refrigerant is reduced by setting the return air pipeline 30 , which ensures that the total amount of refrigerant in the refrigerant circulation system does not change, and prevents the normal operation of the refrigerant circulation circuit 10 from being affected.

Optionally, a filter 32 is provided on the liquid supply pipeline 23 for filtering impurities in the refrigerant in the liquid supply pipeline 23 . In this way, it is possible to prevent the liquid supply pipeline 23 from being blocked, to ensure that the liquid supply pipeline 23 can supply liquid stably, and to improve reliability.

Optionally, a one-way valve 29 is provided on the liquid supply pipeline 23 for preventing the liquid refrigerant in the liquid supply pipeline 23 from flowing back into the refrigerant circulation circuit 10 and causing the refrigerant circulation circuit 10 to malfunction.

In some embodiments, the compressor liquid supply system further includes a pressure detection device 31 and a controller (not shown in the figure).

The pressure detection device 31 is arranged in the refrigerant circulation circuit 10 to obtain the pressure values of the compressor inlet and the compressor outlet. In this way, the pressure values of the compressor inlet and the compressor outlet can be obtained in real time by setting the pressure detection device 31 .

The controller is connected with the pressure detection device 31, the pressurizing device 25, the first flow regulating valve 26, the second flow regulating valve 27 and the third flow regulating valve 28, and is configured to receive the pressure of the compressor inlet and the compressor outlet value, calculate the pressure difference between the compressor inlet and the compressor outlet, and control the start and stop of the pressurizing device 25 and/or control the first flow regulating valve 26 and the second flow regulating valve according to the corresponding relationship between the pressure difference and the preset pressure range 27 and the opening degree of the third flow regulating valve 28.

Optionally, the pressure detection device 31 includes a first pressure sensor 311 and a second pressure sensor 312, the first pressure sensor 311 is arranged at the inlet of the compressor 11, and is used to detect the pressure at the inlet of the compressor in real time and send it to the controller, The second pressure sensor 312 is arranged at the outlet of the compressor 11, and is used to detect the pressure at the outlet of the compressor in real time and send it to the controller. In this way, the pressure at the inlet of the compressor and the pressure at the outlet of the compressor can be obtained in real time.

As shown in Figure 4, optionally, this embodiment provides a control method for a compressor liquid supply system, including:

S401, the controller obtains the pressure difference between the compressor inlet and the compressor outlet.

S402, according to the corresponding relationship between the pressure difference between the compressor inlet and the compressor outlet and the preset pressure range, the controller controls the start and stop of the pressurizing device 25 and/or controls the first flow regulating valve 26, the second flow regulating valve 27 and the The opening degree of the third flow regulating valve 28 .

With this embodiment, according to the corresponding relationship between the pressure difference between the compressor inlet and the compressor outlet and the preset pressure range, by controlling the pressurizing device 25, the first flow regulating valve 26, the second flow regulating valve 27 and the third flow regulating The way of the valve 28 can adjust the pressure of the refrigerant in the liquid supply pipeline 23 to ensure that the refrigerant provided by the liquid supply pipeline 23 to the compressor 11 meets the pressure difference requirement of the compressor.

As shown in Figure 5, optionally, this embodiment provides a control method for the liquid supply system of the compressor. According to the corresponding relationship between the pressure difference between the compressor inlet and the compressor outlet and the preset pressure range, the controller controls The start and stop of the pressurizing device 25 and/or control the opening of the first flow regulating valve 26, the second flow regulating valve 27 and the third flow regulating valve 28 include:

S501, when the pressure difference is greater than the maximum value of the preset pressure range, the controller controls the second flow regulating valve 27 to reduce the opening degree and/or the third flow regulating valve 28 to reduce the opening degree.

S502, the controller acquires the adjusted pressure difference.

S503. If the adjusted pressure difference deviates from the preset pressure range, the controller adjusts the opening of the first flow regulating valve 26 until the adjusted pressure difference is within the preset pressure range.

With this embodiment, when the pressure difference between the compressor inlet and the compressor outlet is greater than the maximum value of the preset pressure range, coarse adjustment is performed by controlling the second flow regulating valve 27 and/or the third flow regulating valve 28, and then controlling the second flow regulating valve 28 A flow regulating valve 26 is used for fine adjustment. In this way, by reducing the amount of refrigerant obtained by the condenser 12 and/or the evaporator 13, the pressure in the liquid supply pipeline 23 can be quickly reduced. Exemplarily, since the refrigerant pressure in the condenser 12 is greater than the refrigerant pressure in the evaporator 13, the opening degree of the third flow regulating valve 28 is mainly reduced during adjustment to prevent the refrigerant pressure from dropping too fast and affecting the compression. The operation of machine 11. This adjustment method can ensure that the adjusted pressure difference is within the preset pressure range, which can effectively improve the accuracy of the control system.

As shown in Figure 6, optionally, this embodiment provides a control method for a compressor liquid supply system, according to the corresponding relationship between the pressure difference between the compressor inlet and compressor outlet and the preset pressure range, the controller controls The opening and closing of the pressurizing device 25 and/or controlling the opening of the first flow regulating valve 26, the second flow regulating valve 27 and the third flow regulating valve 28 also include:

S601, when the pressure difference is less than the minimum value of the preset pressure range, the controller controls the pressurizing device 25 to start.

S602, the pressurizing device 25 runs for a preset time or the pressure of the liquid refrigerant in the liquid supply pipeline 23 is increased to a preset boosting pressure, and the controller controls the pressurizing device 25 to close.

S603, the controller adjusts the opening degree of the first flow regulating valve 26 until the adjusted pressure difference is within a preset pressure range, and the difference between the preset boost pressure and the preset pressure range is smaller than the preset difference.

With this embodiment, when the pressure difference between the compressor inlet and the compressor outlet is less than the minimum value of the preset pressure range, the pressure of the refrigerant in the liquid supply pipeline 23 can be quickly increased by starting the pressurizing device 25 to ensure the supply The refrigerant provided by the liquid pipeline 23 to the compressor 11 meets the pressure difference requirement of the compressor.

The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. Embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A liquid supply system for a compressor, which is applied to a refrigerant circulation circuit (10) formed by sequentially connecting a compressor (11), a condenser (12) and an evaporator (13), wherein the liquid supply system for a compressor includes :

   The first liquid-taking pipeline (21), one end communicated with the liquid supply port of the evaporator (13), is used to take liquid refrigerant from the evaporator (13);

   A second liquid-taking pipeline (22), one end of which is connected to the liquid supply port of the condenser (12), is used to take liquid refrigerant from the condenser (12);

   A liquid supply pipeline (23), the other end of the first liquid extraction pipeline (21) and the other end of the second liquid extraction pipeline (22) are connected to one end of the liquid supply pipeline (23) The other end of the liquid supply pipeline (23) is connected with the inlet of the compressor (11) for connecting the first liquid extraction pipeline (21) and the second liquid extraction pipe The liquid refrigerant in the road (22) is delivered to the inlet of the compressor (11);

   A pressurizing device (25), arranged on the liquid supply pipeline (23), used to adjust the pressure of the refrigerant in the liquid supply pipeline (23);

   A parallel pipeline (24), both ends of the parallel pipeline (24) communicate with the liquid supply pipeline (23), and are connected in parallel with the pressurizing device (25).
2. The compressor liquid supply system according to claim 1, further comprising:

   The second flow regulating valve (27) is arranged on the first liquid-taking pipeline (21), and is used for adjusting the refrigerant flow rate of the first liquid-taking pipeline (21).
3. The compressor liquid supply system according to claim 2, further comprising:

   The third flow regulating valve (28) is arranged on the second liquid-taking pipeline (22), and is used for adjusting the refrigerant flow rate of the second liquid-taking pipeline (22).
4. The compressor liquid supply system according to claim 3, further comprising:

   The first flow regulating valve (26) is arranged on the parallel pipeline (24), and is used to adjust the refrigerant flow of the parallel pipeline (24).
5. The compressor liquid supply system according to claim 1, further comprising:

   A one-way valve (29) is arranged on the first liquid-taking pipeline (21), and is used to prevent the refrigerant in the first liquid-taking pipeline (21) from flowing back.
6. The compressor liquid supply system according to claim 1, characterized in that, the compressor (11) is provided with a bearing air supply pipeline (111), and the bearing air supply pipeline (111) is connected to the compressor ( 11) is connected to the inlet, and the bearing air supply pipeline (111) is used to supply air to the bearing of the compressor (11).
7. The compressor liquid supply system according to claim 6, characterized in that, a throttling assembly (112) is arranged in the bearing air supply pipeline (111), and the throttling assembly (112) is used to transform the liquid refrigerant into a gaseous refrigerant.
8. The compressor liquid supply system according to claim 4, further comprising:

   A pressure detection device (31), arranged in the refrigerant circulation circuit (10), for obtaining the pressure values of the compressor inlet and the compressor outlet;

   Controller, with the pressure detecting device (31), the pressurizing device (25), the first flow regulating valve (26), the second flow regulating valve (27) and the third flow regulating valve ( 28) Homogeneous connection, configured to receive the pressure values of the compressor inlet and the compressor outlet, calculate the pressure difference between the compressor inlet and the compressor outlet, and calculate the pressure difference between the compressor inlet and the compressor outlet according to the pressure difference and the preset pressure range, control the start and stop of the pressurizing device (25), the opening degree of the first flow regulating valve (26), the opening degree of the second flow regulating valve (27) and the third flow regulating valve ( 28) at least one of the opening degrees.
9. The compressor liquid supply system according to claim 8, wherein the controller is configured to:

   When the pressure difference is greater than the maximum value of the preset pressure range, control the second flow regulating valve (27) to reduce the opening degree and/or the third flow regulating valve (28) to reduce the opening degree;

   Obtain the adjusted pressure difference;

   If the adjusted pressure difference deviates from the preset pressure range, adjust the opening degree of the first flow regulating valve (26) until the adjusted pressure difference is within the preset pressure range.
10. The compressor liquid supply system according to claim 8, wherein the controller is further configured to:

    When the pressure difference is less than the minimum value of the preset pressure range, the pressurizing device (25) is activated, and the pressurizing device (25) runs for a preset time period or in the liquid supply pipeline (23) The pressurized pressure of the liquid refrigerant is increased to the preset boost pressure, the pressurization device (25) is closed, and the opening of the first flow regulating valve (26) is adjusted until the adjusted pressure difference is at the preset pressure. Within the preset pressure range, the difference between the preset boost pressure and the preset pressure range is smaller than the preset difference.

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