WO2023087723A1

WO2023087723A1 - Method and apparatus for controlling refrigerant circulation system, and refrigerant circulation system

Info

Publication number: WO2023087723A1
Application number: PCT/CN2022/102210
Authority: WO
Inventors: 陈远; 邓善营; 王书森; 张捷; 张晓锐; 毛守博; 顾超
Original assignee: 青岛海尔空调电子有限公司; 青岛海尔空调器有限总公司; 海尔智家股份有限公司
Priority date: 2021-11-22
Filing date: 2022-06-29
Publication date: 2023-05-25
Also published as: CN114198921B; CN114198921A

Abstract

The present application relates to the technical field of refrigeration. Disclosed is a method for controlling a refrigerant circulation system. The refrigerant circulation system comprises an air suspension compressor. The method comprises: acquiring first operation parameters of an air suspension compressor; and when the first operation parameters indicate that the air suspension compressor has a surge risk, adjusting a gas supply scheme for the air suspension compressor. Whether an air suspension compressor has a surge risk is determined by means of acquiring first operation parameters of the air suspension compressor. When the air suspension compressor has a surge risk, a gas supply scheme for the air suspension compressor is adjusted. In this way, in view of the gas supply characteristic of the air suspension compressor, the gas supply scheme for the air suspension compressor can be adjusted when the first operation parameters indicate that the air suspension compressor has a surge risk, such that a stable gas supply can be guaranteed, and the possibility of surge occurring in the air suspension compressor can also be reduced. Further disclosed in the present application are an apparatus for controlling a refrigerant circulation system, and a refrigerant circulation system.

Description

Method, device and refrigerant circulation system for controlling refrigerant circulation system

This application is based on a Chinese patent application with application number 202111386879.4 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 refrigeration, for example, to a method, device and refrigerant circulation system for controlling a refrigerant circulation system.

Background technique

Centrifugal chillers are used in more and more occasions due to their high efficiency and large cooling capacity. During the use of centrifugal chillers, due to the small end load, the refrigerant in the compressor system has a reverse pressure gradient flow, and at the same time the flow field deteriorates, causing refrigerant backflow, and a "surge" phenomenon occurs. Surge will not only periodically increase noise and vibration, but also high temperature gas backflow into the compressor will also cause the temperature of the compressor shell and bearings to rise, and even damage the compressor and the entire refrigeration equipment.

In the existing technical solutions, taking the conventional centrifugal chiller as an example, the prevention of surge is mostly based on adjusting the inlet guide vane and the motor speed. At the same time, a screw chiller with small cooling capacity is installed in the entire air conditioning system. By turning on the screw chiller at low load, the surge of the centrifuge can also be avoided. As for the maglev chiller, since the cooling capacity of the single compressor is smaller than that of the conventional centrifuge, multiple maglev compressors are often used to combine the chiller. When in the low load range, the "surge" is avoided by turning off the number of compressors. When there is only one compressor, the method of "inlet guide vane + motor speed regulation" is adopted to avoid surge.

Since the air suspension compressor has just emerged, the surge prevention and control scheme of the air suspension chiller is currently only using the same treatment method as the ordinary centrifuge, that is, the method of "importing guide vanes + adjusting the motor speed". However, for the characteristics of air suspension compressors that require air supply, this preventive method suitable for conventional centrifugal chillers has relatively large limitations and cannot play a good preventive role.

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.

Embodiments of the present disclosure provide a method and device for controlling a refrigerant circulation system, and the refrigerant circulation system, so as to reduce the possibility of surge of an air suspension compressor.

In some embodiments, the refrigerant circulation system includes: an air suspension compressor, and the method includes: acquiring a first operating parameter of the air suspension compressor; In the case of a risk of surge, the air supply scheme to the air suspension compressor is adjusted.

In some embodiments, the device includes: a processor and a memory storing program instructions, and the processor is configured to execute the aforementioned method for controlling a refrigerant circulation system when executing the program instructions.

In some embodiments, the refrigerant circulation system includes: a refrigerant circulation loop, including: an air suspension compressor, a first heat exchanger, and a second heat exchanger; a cooling water circulation pipeline, and the first heat exchanger and the cooling water pipeline is provided with a cooling water pump; the chilled water circulation pipeline is communicated with the second heat exchanger, and the chilled water pipeline is provided with a chilled water pump; the air supply pipeline is connected with the The gas supply port of the air suspension compressor is connected; the gas supply pipeline is connected with the gas supply port of the air suspension compressor; the bypass pipeline is connected with the first heat exchanger and the second heat exchanger Between; the first branch, communicated with the gas supply pipeline, configured to supply refrigerant to the gas supply pipeline; the second pipeline, communicated with the supplementary gas pipeline, configured to supply The air pipeline provides refrigerant; and, the aforementioned device for controlling the refrigerant circulation system.

The method, device and refrigerant circulation system for controlling the refrigerant circulation system provided by the embodiments of the present disclosure can achieve the following technical effects:

By acquiring the first operating parameter of the air suspension compressor, it is judged whether the air suspension compressor has a surge risk. In case of a risk of surge, adjust the air supply scheme to the air suspension compressor. In this way, in combination with the air supply characteristics of the air suspension compressor, the air supply scheme of the air suspension compressor can be adjusted when the first operating parameter indicates that the air suspension compressor has a surge risk, and the stable air supply can be ensured. At the same time, it can also reduce the possibility of surge of the air suspension compressor.

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 diagram of a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 2-1 is a schematic diagram of the installation position of the sensor ring in the air suspension compressor in a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 2-2 is a schematic diagram of the position of the rotor axis when the air suspension compressor is in stable operation in a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 2-3 is a schematic diagram of the position of the rotor axis when the air suspension compressor is at a high speed in a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 3 is a schematic diagram of the height relationship between the air supply port of the air suspension compressor, the air outlet of the first heat exchanger, and the air outlet of the economizer in a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 4 is a schematic diagram of a method for controlling a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 5 is a schematic diagram of a scheme for adjusting air supply to an air suspension compressor in a method for controlling a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 6 is a schematic diagram of adjusting the air supply parameters of the air suspension compressor in a method for controlling the refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 7 is a schematic diagram of adjusting a second operating parameter of an air suspension compressor in a method for controlling a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 8 is a schematic diagram of another method for adjusting a second operating parameter of an air suspension compressor in a method for controlling a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 9 is a schematic diagram of adjusting the air supply parameters of the air suspension compressor in a method for controlling the refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 10 is a schematic diagram of another method for controlling a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 11 is a schematic diagram of another method for controlling a refrigerant circulation system provided by an embodiment of the present disclosure;

Fig. 12 is a schematic diagram of an application of the disclosed embodiment;

Fig. 13 is a schematic diagram of a device for controlling a refrigerant circulation system provided by an embodiment of the present disclosure.

Reference signs:

10. Air suspension compressor; 11. Radial static pressure bearing; 12. Sensor ring; 20. First heat exchanger; 30. Second heat exchanger; 40. Air supply pipeline; 41. Filter; 42. Gear Pump; 43. Air supply tank; 50. Air supply pipeline; 60. Bypass pipeline; 61. The third regulating valve; 70. The first branch; 71. The first regulating valve; 80. The second branch; 81 , the second regulating valve; 90, the economizer; 100, the gas pipeline.

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.

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.

The term "correspondence" may refer to an association relationship or a binding relationship, and the correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

As shown in FIG. 1 , an embodiment of the present disclosure provides a refrigerant circulation system, including: a refrigerant circulation circuit, an air supply pipeline 40 , an air supply pipeline 50 , a bypass pipeline 60 , a first branch 70 and a second branch 80. The refrigerant circulation circuit is composed of an air suspension compressor 10 , a first heat exchanger 20 and a second heat exchanger 30 . Optionally, the first heat exchanger 20 is a condenser, and the second heat exchanger 30 is an evaporator. The first heat exchanger 20 communicates with the second heat exchanger 30 through a bypass line 60 . The bypass line 60 is provided with a third regulating valve 61 . By controlling the opening and closing of the third regulating valve 61 , the opening and closing of the bypass pipeline 60 can be controlled. A cooling water circulation pipeline is communicated with the first heat exchanger 20, and a cooling water pump is arranged on the cooling water circulation pipeline. The second heat exchanger 30 is connected with a chilled water circulation pipeline, and a chilled water pump is arranged on the chilled water circulation pipeline.

Referring to Fig. 2-1, two sets of radial hydrostatic bearings 11 and axial hydrostatic bearings are provided in the inner cavity of the air suspension compressor 10 respectively. And a sensor ring 12 is provided on one side of the two sets of radial static pressure bearings 11 . The sensor ring 12 has a displacement collection point, and the main collected data is the real-time position of the rotor axis of the radial static pressure bearing 11 of the air suspension compressor 10 . Referring to Fig. 2-2, when the air suspension compressor 10 is in stable operation, the rotor axis is located at the eccentric reference point O(x ₀ , y ₀ ). Referring to Figure 2-3, when the air suspension compressor 10 is at a high speed, the position of the rotor axis will deviate from the eccentric reference point O(x ₀ , y ₀ ), and its actual position is O'(x ₀ ', y ₀ ') . The reason is that the higher the rotational speed of the rotor, the greater the radial force borne by the radial static pressure bearing 11 . Therefore, the axis will be shifted. H ₀ is the radial gap between the radial static pressure bearing 11 and the rotor, which serves as a space filled with refrigerant gas. In the radial direction, as the offset increases, the radial clearance H ₀ everywhere also becomes different. At the same time, since the bearing capacity of the radial static pressure bearing 11 decreases with the increase of the radial gap _H0 , it indicates that the air supply pressure is unstable at this time, and the air supply volume and air supply pressure provided by the original air supply pipeline 40 have been reduced. Not enough to maintain radial balance of the rotor.

The air suspension compressor 10 has an air supply port and an air supply port. The first heat exchanger 20 communicates with the air supply port of the air suspension compressor 10 through the air supply pipeline 40 to supply air to the bearings of the air suspension compressor 10 . The air supply pipeline 40 is provided with components such as a filter 41 , a gear pump 42 , and an air supply tank 43 . The air outlet of the first heat exchanger 20 communicates with the air supply port of the air suspension compressor 10 through the air supply pipeline 50 to supply air to the air suspension compressor 10 . An economizer 90 is arranged on the air supply pipeline 50 . Optionally, the economizer 90 is a plate heat exchanger or a flasher.

Optionally, referring to FIG. 3 , a horizontal plane is set. The distance between the air supply port of the air suspension compressor 10 and the horizontal plane is H ₁ . The distance between the gas outlet of the first heat exchanger 20 and the horizontal plane is H ₂ . The distance between the air outlet of the economizer 90 and the horizontal plane is H ₃ . Among them, H ₁ >H ₂ >H ₃ . Such a height setting can effectively reduce the air flow disturbance when the second branch 80 is mixed with the refrigerant in the air supply pipeline 50 and avoid the vibration of the pipeline.

The refrigerant output end of the first branch 70 communicates with the gas supply pipeline 40 to provide refrigerant to the gas supply pipeline 40 , thereby increasing the gas supply volume and gas supply pressure of the gas supply pipeline 40 . The refrigerant output end of the second branch circuit 80 communicates with the air supply pipeline 50 to provide refrigerant to the air supply pipeline 50 , so as to increase the amount of refrigerant and the intermediate evaporation temperature of the air supply pipeline 50 . Optionally, the source of the refrigerant provided by the first branch 70 and the second branch 80 may be the gaseous refrigerant in the first heat exchanger 20 . The first heat exchanger 20 is also in communication with the refrigerant input end of the air intake pipeline 100 . Both the refrigerant input end of the first branch 70 and the refrigerant input end of the second branch 80 are connected to the refrigerant output end of the air intake pipeline 100 , so as to realize air extraction from the first heat exchanger 20 . A first regulating valve 71 is provided on the first branch 70 . By controlling the opening and closing of the first regulating valve 71 , the opening and closing of the first branch path 70 can be controlled. A second regulating valve 81 is provided on the second branch 80 . By controlling the opening and closing of the second regulating valve 81 , the opening and closing of the second branch 80 can be controlled.

As shown in FIG. 4 , an embodiment of the present disclosure provides a method for controlling a refrigerant circulation system, including:

S401, the refrigerant circulation system obtains the first operating parameter of the air suspension compressor.

S402. In the case where the first operating parameter indicates that the air suspension compressor has a surge risk, the refrigerant circulation system adjusts an air supply scheme for the air suspension compressor.

When the refrigerant circulation system is in normal operation, the first operating parameters of the air suspension compressor are acquired through corresponding sensors. The first operating parameters include: the suction pressure _Psuction of the air suspension compressor, the discharge pressure P _row of the air suspension compressor, and the offset φ of the rotor axis of the air suspension compressor. Real-time collection of P _suction and P _discharge through the pressure sensors installed at the suction port and discharge port of the air suspension compressor. Through the sensor ring arranged on one side of the radial static pressure bearing of the air suspension compressor, the offset φ of the rotor shaft center is collected in real time. Based on the first operating parameter, it is determined whether the air suspension compressor is at risk of surge. In case the first operating parameter indicates that the air suspension compressor is at risk of surge, the air supply scheme to the air suspension compressor is adjusted.

In the embodiment of the present disclosure, it is judged whether the air suspension compressor has surge risk by acquiring the first operating parameter of the air suspension compressor. In the event of a risk of surge, the air supply scheme to the air suspension compressor is adjusted according to the first operating parameter. In this way, in combination with the air supply characteristics of the air suspension compressor, the air supply scheme of the air suspension compressor can be adjusted when the first operating parameter indicates that the air suspension compressor has a surge risk, and the stable air supply can be ensured. At the same time, it can also reduce the possibility of surge of the air suspension compressor.

Optionally, as shown in Figure 5, the refrigerant circulation system adjusts the air supply scheme for the air suspension compressor, including:

S501, the refrigerant circulation system adjusts the air supply parameters to the air suspension compressor.

S502. In the case where the air supply parameter is adjusted to a maximum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system adjusts a second operating parameter of the air suspension compressor.

S503. In the case where the second operating parameter is adjusted to a minimum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system adjusts an air supplement parameter for the air suspension compressor.

When adjusting the air supply scheme of the air suspension compressor, a step-by-step adjustment method is adopted. First adjust the air supply parameters of the air suspension compressor. This is the first level adjustment scheme. If the occurrence of surge can be reduced through the first-level adjustment, no further adjustment is required. If the air supply parameter is adjusted to the maximum value, the first operating parameter still indicates that the air suspension compressor has a risk of surge, that is, the P _ratio ≥ P _m , indicating that the occurrence of surge cannot be reduced by adjusting the air supply parameter. In this case, the second operating parameter of the air suspension compressor is adjusted. This is the second level adjustment scheme. If the occurrence of surge can be reduced through the secondary adjustment, no further adjustment is required. If the second operating parameter is adjusted to the minimum value, the first operating parameter still indicates that the air suspension compressor has a risk of surge, that is, the P _ratio ≥ P _m , indicating that the occurrence of surge cannot be reduced by adjusting the air supply parameters. In this case, adjust the air supply parameters for the air suspension compressor. This is the third level adjustment scheme. Improve the air supply parameters and air supply parameters, while reducing the occurrence of surge, it can also ensure the stability of the rotor when the compressor motor is running at high speed, and increase the evaporation temperature of the intermediate stage. In this way, setting a three-level adjustment scheme and adjusting step by step can achieve the best effect of reducing the occurrence of surge.

Optionally, as shown in Figure 6, the refrigerant circulation system adjusts the air supply parameters to the air suspension compressor, including:

S601, the refrigerant circulation system controls the connection of the first branch to increase the gas supply parameter.

S602, when the air supply parameter is increased and the P _ratio <P _m , the refrigerant circulation system maintains the first branch connection state; wherein, the P _ratio is the ratio between the suction pressure and the discharge pressure of the air suspension compressor, P _m is the pressure ratio threshold.

The ratio between _the suction pressure Psuction of the air suspension compressor and the discharge pressure P _row is the pressure ratio P _ratio of the air suspension compressor. Set pressure ratio threshold P _m . A higher gas supply parameter A _supply can reduce the occurrence of surge to a certain extent. Therefore, in order to reduce the occurrence of surge, when _adjusting the air supply parameter A for air suspension compression, it is necessary to increase the air supply _parameter A. It can be known from the above structure of the refrigerant circulation system that the gas supply pipeline is connected to the first branch, and the first regulating valve is arranged on the first branch. Control the opening of the first regulating valve, thereby controlling the communication of the first branch. The refrigerant is supplied to the air supply pipeline through the first branch, thereby increasing the air supply parameter A _supply , that is, increasing the air supply volume and air supply pressure. If _{the A supply} _is less than or equal to the maximum value A _max of the air supply parameter during the process of increasing the air supply parameter A supply, and the P _ratio <P _m , it means that the pressure ratio has dropped to a safe range at this time, and the air suspension compressor does not have panting. vibration risk. In this case, keep the first regulating valve open and keep the current gas supply _parameter A.

Optionally, as shown in Figure 7, the refrigerant circulation system adjusts the second operating parameters of the air suspension compressor, including:

S701, the refrigerant circulation system controls the rotation speed of the motor to decrease.

S702, under the condition that the rotation speed of the control motor is reduced, N≥N _min and P _ratio <P _m , the refrigerant circulation system controls the motor to maintain the current speed; wherein, N is the speed of the motor, and N _min is the minimum value of the speed of the motor; The P _ratio is the ratio between the suction pressure and the discharge pressure of the air suspension compressor, and P _m is the pressure ratio threshold.

The ratio between _the suction pressure Psuction of the air suspension compressor and the discharge pressure P _row is the pressure ratio P _ratio of the air suspension compressor. Set pressure ratio threshold P _m . N _min is the minimum speed to prevent surge of the air suspension compressor. Reducing the motor speed of the air suspension compressor can also reduce the occurrence of surge to a certain extent. Therefore, when the air supply parameter A _reaches the maximum value A _max and the occurrence of surge cannot be reduced by increasing the air supply parameter, the rotational speed N of the motor is controlled to decrease. If N≥N _min and P _ratio <P _m during the process of reducing the motor speed, it means that the pressure ratio has been reduced to a safe range at this time, and the air suspension compressor does not have the risk of surge. In this case, even if the rotational speed N of the motor does not continue to decrease, the air suspension compressor has no risk of surge. At this time, the motor is controlled to maintain the current rotation speed, and the first regulating valve is controlled to remain open. Since the rotational speed N of the motor has decreased at this time and the stability of the rotor has been improved, there is no need to judge the magnitude of the offset φ of the rotor axis. In this way, when the occurrence of surge cannot be reduced by increasing the air supply parameter, the rotational speed of the motor is controlled to decrease. Reduce the occurrence of surge by reducing the motor speed. At the same time, when the air suspension compressor does not have the risk of surge, the motor is controlled to maintain the current speed.

Optionally, as shown in FIG. 8 , the refrigerant circulation system adjusts the second operating parameters of the air suspension compressor, including:

S801, the refrigerant circulation system controls the rotation speed of the motor to decrease.

S802, under the condition that the rotation speed of the control motor decreases, N≥N _min and P _ratio <P _m , the refrigerant circulation system controls the motor to maintain the current rotation speed.

S803, when the rotation speed of the control motor is reduced, N=N _min and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system controls the opening of the inlet guide vane to decrease.

S804, under the condition that the opening degree of the inlet guide vane is controlled to decrease, Ψ≥Ψ _min and the P _ratio <P _m , the refrigerant circulation system controls the inlet guide vane to maintain the current opening degree. Among them, N is the speed of the motor, N _min is the minimum value of the speed of the motor; P _{ratio is} the ratio between the suction pressure and the discharge pressure of the air suspension compressor, P _m is the pressure ratio threshold; Ψ is the inlet guide vane The opening degree of , Ψ _min is the minimum value of the opening degree of the inlet guide vane.

If N=N _min during the process of reducing the motor speed, and the first operating parameter still indicates that the air suspension compressor has a risk of surge, it means that the occurrence of surge cannot be reduced by reducing the motor speed. And reducing the opening Ψ of the inlet guide vane can also reduce the occurrence of surge to a certain extent. Therefore, in this case, the opening degree Ψ of the control inlet guide vane decreases. If Ψ≥Ψ _min and P _ratio <P _m are in the process of controlling the opening of the inlet guide vane to decrease, it means that the pressure ratio has been reduced to a safe range at this time, and the air suspension compressor has no risk of surge. In this case, even if the opening of the inlet guide vane does not continue to decrease, the air suspension compressor does not have the risk of surge. At this time, the opening degree of the inlet guide vane is controlled to maintain the current opening degree. If Ψ=Ψ _min , and P _ratio ≥ P _m , it means that the occurrence of surge cannot be reduced by reducing the opening of the inlet guide vane at this time, that is, the occurrence of surge cannot be reduced by reducing the second operating parameter . In this case, it is necessary to carry out the third-level adjustment scheme, that is, to increase the air supply parameters of the air suspension compressor. In this way, when the occurrence of surge cannot be reduced by reducing the rotational speed of the motor, the opening degree of the inlet guide vane is controlled to decrease. Reduce the occurrence of surge by reducing the opening of the inlet guide vane. At the same time, when the air suspension compressor does not have the risk of surge, the opening of the inlet guide vane is controlled to maintain the current opening, so as to prevent the air intake from being affected by the opening of the inlet guide vane being too small. It should be noted that, the specific implementation process of steps S801 and S802 can be referred to the above-mentioned embodiments, and will not be repeated here.

Optionally, as shown in Figure 9, the refrigerant circulation system adjusts the air supply parameters of the air suspension compressor, including:

S901, the refrigerant circulation system controls the connection of the second branch to increase the gas supply parameter.

S902, in the case of increasing the gas supply parameter and the P _ratio <P _m , the refrigerant circulation system maintains the second branch connection state.

Increasing the qi supplement _parameter B can also reduce the occurrence of surge to a certain extent. It can be seen from the above structure of the refrigerant circulation system that the air supply pipeline is connected with the second branch, and the second regulating valve is arranged on the second branch. Control the opening of the second regulating valve, thereby controlling the communication of the second branch. The refrigerant is supplied to the supplementary gas pipeline through the second branch, thereby increasing the supplementary gas parameter B _supplement , that is, increasing the amount of refrigerant and the evaporation temperature of the supplementary gas. If the occurrence of surge cannot be reduced by reducing the second operating parameter, the second regulating valve is controlled to open, so that the second branch is connected. After the second branch is connected, the purpose of _increasing the gas supplement parameter B can be achieved. In the process of increasing the air supplement parameter B _supplement , the B _supplement is less than or equal to the maximum value B _max of the air supplement parameter, and the P _ratio <P _m , indicating that the pressure ratio has been reduced to a safe range at this time, and the air suspension compressor does not have surge risks of. In this case, keep the second regulating valve open to maintain the current air supplement parameter B _supplement .

Optionally, as shown in FIG. 10 , an embodiment of the present disclosure provides another method for controlling a refrigerant circulation system, including:

S1001. The refrigerant circulation system obtains the first operating parameter of the air suspension compressor.

S1002. In the case that the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system adjusts an air supply parameter to the air suspension compressor.

S1003. In the case that the air supply parameter is adjusted to a maximum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system adjusts a second operating parameter of the air suspension compressor.

S1004. In the case where the second operating parameter is adjusted to a minimum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system adjusts an air supplement parameter for the air suspension compressor.

S1005, under the condition that the air supply parameter is adjusted to a maximum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system controls the bypass pipeline to communicate.

S1006, the refrigerant circulation system controls the air suspension compressor to stop.

It can be known from the above structure of the refrigerant circulation system that a bypass pipeline is communicated between the first heat exchanger and the second heat exchanger. A third regulating valve is arranged on the bypass line. If the air supplement parameter B _{is adjusted} to the maximum value B _max , the first operating parameter still indicates that the air suspension compressor has a risk of surge, indicating that it is impossible to reduce the occurrence of surge by increasing _the air supplement parameter B at this time . In this case, the third regulating valve is controlled to open, thereby controlling the communication of the bypass line. This is the fourth level adjustment scheme. After the bypass pipeline is connected, the air suspension compressor enters the automatic shutdown countdown. The time is preset by the program and displayed on the system's display. The shutdown of the air suspension compressor can be canceled manually, otherwise the system automatically shuts down the air suspension compressor by default. In this way, when the occurrence of surge cannot be reduced by adjusting the air supply scheme, the aggravation of the risk of surge of the air suspension compressor is prevented by means of shutdown protection. At the same time, since the bypass air volume is much larger than the air supply volume and the air supplement volume, there is no need to continue to increase the air supply parameters and the air supplement parameters. Therefore, after the bypass line is connected, the control first branch and the second branch are disconnected. In this way, unnecessary waste of energy can be avoided. It should be noted that, the specific implementation process of steps S1001, S1002, S1003 and S1004 can be referred to the above-mentioned embodiments, and will not be repeated here.

Optionally, the first operating parameter indicates that the air suspension compressor is at risk of surge, including:

Before adjusting the air supply scheme for the air suspension compressor, P _ratio ≥ P _m and φ > φ _max indicates that the air suspension compressor has a surge risk; in the case of adjusting the air supply scheme for the air suspension compressor, the P _ratio ≥P _m indicates that the air suspension compressor has a surge risk; among them, the P _ratio is the ratio between the suction pressure and the discharge pressure of the air suspension compressor, P _m is the pressure ratio threshold; φ is the rotor of the air suspension compressor The offset of the axis, φ _max is the maximum allowable offset of the rotor axis.

The ratio between the suction pressure Psuction of the air suspension compressor and the discharge pressure P _row of the air suspension compressor is the pressure ratio _P _ratio . Set the pressure ratio threshold P _m and the maximum offset of the rotor axis φ _max . Before adjusting the air supply scheme to the air suspension compressor, if the P _ratio <P _m , it means that the air suspension compressor has no surge risk. When P _ratio ≥ P _m , since the motor speed is too high at this time, the rotor of the motor is easy to hit the bearing, so it is necessary to further judge the offset φ of the rotor axis of the air suspension compressor. If P _ratio≥P _m and φ≤φ _max , it means that the air suspension compressor has no risk of surge. If P _ratio ≥ P _m and φ > φ _max , that is, the pressure ratio is too large, and at the same time, the rotor deviates to a large extent. That is to say, the air supply pressure is unstable at this time, and the air supply volume and air supply pressure provided by the original air supply pipeline 40 are no longer sufficient to maintain the radial balance of the rotor, indicating that the air suspension compressor has a risk of surge. In this way, before adjusting the air supply scheme for the air suspension compressor, when the P _ratio ≥ P _m , it is further combined with the size of the offset φ of the rotor axis to judge whether the air suspension compressor has a surge risk, which can make the judgment The result is more accurate. When adjusting the air supply scheme for the air suspension compressor, the air supply parameter is increased, which will reduce the rotor offset and be less than or equal to φ _max again. Moreover, when adjusting the air supply scheme to the air suspension compressor, the motor speed will be reduced. After the motor speed decreases, the rotor stability is improved. Therefore, when adjusting the air supply scheme for the air suspension compressor, it is no longer necessary to judge the offset φ of the rotor axis, but only to judge the pressure ratio P _ratio . That is, in the case of adjusting the air supply scheme to the air suspension compressor, the P _ratio ≥ _{P m} indicates that the air suspension compressor has a surge risk.

Optionally, with reference to what is shown in FIG. 11 , an embodiment of the present disclosure provides another method for controlling a refrigerant circulation system, including:

S1101. The refrigerant circulation system obtains the first operating parameter of the air suspension compressor.

S1102, in the case that the first operating parameter indicates that the air suspension compressor has a surge risk, the refrigerant circulation system adjusts the gas supply parameter to the air suspension compressor.

S1103. In the case that the air supply parameter is adjusted to a maximum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system adjusts a second operating parameter of the air suspension compressor.

S1104, under the condition that the second operating parameter is adjusted to a minimum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system adjusts an air supplement parameter for the air suspension compressor.

S1105, under the condition that the air supply parameter is adjusted to a maximum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, the refrigerant circulation system controls the bypass pipeline to communicate.

S1106, the refrigerant circulation system controls the air suspension compressor to stop.

S1107, the refrigerant circulation system controls the chilled water pump and the cooling water pump to keep running.

After the air suspension compressor is turned off, the chilled water pump and cooling water pump of the system still keep running, and the system is still on. In this way, the air suspension compressor is continuously protected. It should be noted that, the specific implementation process of steps S1101, S1102, S1103, S1104, S1105, and S1106 can be referred to the above-mentioned embodiments, and will not be repeated here.

In practical application, as shown in Figure 12:

S1201, start the air suspension compressor; then execute S1202;

S1202, obtain the suction port pressure _Psuction and exhaust port pressure _Prow of the air suspension compressor, and calculate the pressure ratio P _ratio ; then execute S1203;

S1203, judging whether P _ratio <P _m ; if yes, execute S1204; if not, execute S1205;

S1204, the refrigerant circulation system maintains the current running state;

S1205, obtain the offset φ of the rotor axis of the air suspension compressor; then execute S1206;

S1206, judging whether φ>φ _max ; if yes, execute S1207; if not, execute S1204;

S1207, control the opening of the first regulating valve; then execute S1208;

S1208, judge the size of A _supply and A _max , P _ratio and P _m ; if A _supply≤A _max and P _ratio <P _m , execute S1210; if A _supply =A _max and P _ratio≥P _m , execute S1209 ;

S1209, control the speed N of the motor to decrease; then execute S1211;

S1210, controlling the first regulating valve to keep open;

S1211, judge the size of N and N _min , P _ratio and P _m ; if N≥N _min and P _ratio <P _m , execute S1212; if N=N _min and P _ratio≥P _m , execute S1213;

S1212, control the motor to maintain the current speed, and keep the first regulating valve open;

S1213, controlling the opening degree Ψ of the inlet guide vane to decrease; then execute S1214;

S1214, judge the size of Ψ and Ψ _min , P _ratio and P _m ; if Ψ≥Ψ _min and P _ratio <P _m , execute S1215; if Ψ=Ψ _min and P _ratio≥P _m , execute S1216;

S1215, controlling the inlet guide vane to maintain the current opening;

S1216, controlling the opening of the second regulating valve; then execute S1217;

S1217, judge the size of B _complement and B _max , P _ratio and P _m ; if B _{complement≤B} _max and P _ratio <P _m , execute S1218; if B=B _max and P _ratio≥P _m , execute S1219;

S1218, controlling the second regulating valve to keep open;

S1219, control the third regulating valve to open; then execute S1220;

S1220, controlling the closing of the first regulating valve and the second regulating valve; then execute S1221;

S1221, controlling the air suspension compressor to stop; then execute S1222;

S1222, control the chilled water pump and the cooling water pump to keep running.

An embodiment of the present disclosure provides a device for controlling a refrigerant circulation system, including an acquisition module and an adjustment module. The obtaining module is configured to obtain the first operating parameter of the air suspension compressor. The adjustment module is configured to adjust the air supply scheme to the air suspension compressor if the first operating parameter indicates that the air suspension compressor is at risk of surge.

Using the device for controlling the refrigerant circulation system provided by the embodiments of the present disclosure, combined with the air supply characteristics of the air suspension compressor, it is possible to control the air suspension compressor when the first operating parameter indicates that the air suspension compressor has a surge risk. The adjustment of the air supply scheme can not only ensure the stability of the air supply, but also reduce the possibility of surge of the air suspension compressor.

As shown in FIG. 13 , an embodiment of the present disclosure provides a device for controlling a refrigerant circulation system, including a processor (processor) 130 and a memory (memory) 131 . Optionally, the device may also include a communication interface (Communication Interface) 132 and a bus 133. Wherein, the processor 130 , the communication interface 132 , and the memory 131 can communicate with each other through the bus 133 . Communication interface 132 may be used for information transfer. The processor 130 can call the logic instructions in the memory 131 to execute the method for controlling the refrigerant circulation system in the above embodiments.

In addition, the above-mentioned logic instructions in the memory 131 may be implemented in the form of software function units and be stored in a computer-readable storage medium when sold or used as an independent product.

As a computer-readable storage medium, the memory 131 can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 130 executes the program instructions/modules stored in the memory 131 to execute functional applications and data processing, that is, to implement the method for controlling the refrigerant circulation system in the above-mentioned embodiments.

The memory 131 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal device, and the like. In addition, the memory 131 may include a high-speed random access memory, and may also include a non-volatile memory.

An embodiment of the present disclosure provides a refrigerant circulation system, including: a refrigerant circulation circuit, an air supply pipeline 40, an air supply pipeline 50, a bypass pipeline 60, a first branch 70, a second branch 80 and the above-mentioned A device for controlling the refrigerant circulation system. Wherein, the specific implementation process of the refrigerant circulation circuit, the gas supply pipeline 40 , the supplementary gas pipeline 50 , the bypass pipeline 60 , the first branch 70 and the second branch 80 can refer to the above-mentioned embodiments, and will not be repeated here.

An embodiment of the present disclosure provides a storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above-mentioned method for controlling a refrigerant circulation system.

The above-mentioned storage medium may be a transitory computer-readable storage medium, or a non-transitory computer-readable storage medium.

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, logical, electrical, procedural, 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. Also, the terms used in the present application are used to describe the embodiments only and are not used to limit the claims. As used in the examples and description of the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well unless the context clearly indicates otherwise . Similarly, the term "and/or" as used in this application is meant to include any and all possible combinations of one or more of the associated listed ones. Additionally, when used in this application, the term "comprise" and its variants "comprises" and/or comprising (comprising) etc. refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Herein, what each embodiment focuses on may be the difference from other embodiments, and the same and similar parts of the various embodiments may refer to each other. For the method, product, etc. disclosed in the embodiment, if it corresponds to the method part disclosed in the embodiment, then the relevant part can refer to the description of the method part.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software may depend on the specific application and design constraints of the technical solution. Said artisans may implement the described functions using different methods for each particular application, but such implementation should not be regarded as exceeding the scope of the disclosed embodiments. The skilled person can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units may only be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined Or it can be integrated into another system, or some features can be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the disclosure. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than that disclosed in the description, and sometimes there is no specific agreement between different operations or steps. order. For example, two consecutive operations or steps may, in fact, be performed substantially concurrently, or they may sometimes be performed in the reverse order, depending upon the functionality involved. Each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by dedicated hardware implemented in combination with computer instructions.

Claims

A method for controlling a refrigerant circulation system, the refrigerant circulation system comprising: an air suspension compressor, characterized in that the method comprises:

Obtain the first operating parameter of the air suspension compressor;

In a case where the first operating parameter indicates that the air suspension compressor has a risk of surge, an air supply scheme to the air suspension compressor is adjusted.
The method according to claim 1, wherein the adjusting the air supply scheme to the air suspension compressor comprises:

Adjust the air supply parameters to the air suspension compressor;

adjusting a second operating parameter of the air suspension compressor in the event that the air supply parameter is adjusted to a maximum value and the first operating parameter indicates that the air suspension compressor is at risk of surge;

In a case where the second operating parameter is adjusted to a minimum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, an air supplement parameter for the air suspension compressor is adjusted.
The method according to claim 2, characterized in that, the gas supply port of the air suspension compressor is connected with the gas supply pipeline, and the gas supply pipeline is connected with the first branch, and the first branch The circuit is configured to provide refrigerant to the air supply pipeline; the adjustment of the air supply parameters to the air suspension compressor includes:

controlling the communication of the first branch to increase the gas supply parameter;

In the case of increasing the gas supply parameter and P ratio <P m , maintaining the communication state of the first branch;

Wherein, the P ratio is the ratio between the suction pressure and the discharge pressure of the air suspension compressor, and P m is the pressure ratio threshold.
The method according to claim 2, wherein the second operating parameter comprises: the rotational speed of the motor of the air suspension compressor; the adjusting the second operating parameter of the air suspension compressor comprises:

controlling the speed of the motor to decrease;

Under the condition that the rotational speed of the motor is controlled to decrease, N≥N min and P ratio <P m , the motor is controlled to maintain the current rotational speed;

Wherein, N is the rotational speed of the motor, N min is the minimum value of the rotational speed of the motor; P ratio is the ratio between the suction pressure and the discharge pressure of the air suspension compressor, and P m is the pressure ratio threshold .
The method according to claim 4, wherein the second operating parameter further comprises: the opening degree of the inlet guide vane of the air suspension compressor; the adjustment of the second operating parameter of the air suspension compressor ,Also includes:

When the rotational speed of the motor is controlled to decrease, N=N min and the first operating parameter indicates that the air suspension compressor has a risk of surge, the opening of the inlet guide vane is controlled to decrease;

In the case of controlling the opening of the inlet guide vane to decrease, Ψ≥Ψ min and P ratio <P m , controlling the inlet guide vane to maintain the current opening;

Wherein, Ψ is the opening of the inlet guide vane, and Ψ min is the minimum value of the opening of the inlet guide vane.
The method according to claim 2, characterized in that, the gas supply port of the air suspension compressor is connected with the gas supply pipeline, and the gas supply pipeline is connected with the second branch, and the second branch is configured In order to provide refrigerant to the air supply pipeline; the adjustment of the air supply parameters of the air suspension compressor includes:

controlling the connection of the second branch to improve the gas supplement parameter;

When the gas supplement parameter is increased and the P ratio <P m , the connection state of the second branch is maintained.
The method according to claim 2, wherein the air suspension compressor forms a refrigerant circulation loop with the first heat exchanger and the second heat exchanger, and the first heat exchanger communicates with the first heat exchanger through a bypass pipeline. The second heat exchanger is connected; after the adjustment of the air supply parameters of the air suspension compressor, the adjustment of the air supply scheme of the air suspension compressor also includes:

In the case where the air supply parameter is adjusted to a maximum value and the first operating parameter indicates that the air suspension compressor has a risk of surge, controlling the communication of the bypass pipeline;

Control the air suspension compressor to shut down.
The method according to any one of claims 1 to 7, wherein the first operating parameters include: suction pressure and discharge pressure of the air suspension compressor, and The offset of the rotor axis; the first operating parameter indicates that the air suspension compressor has a surge risk, including:

Before adjusting the air supply scheme for the air suspension compressor, P ratio≥P m and φ>φ max indicates that the air suspension compressor has a surge risk;

In the case of adjusting the air supply scheme to the air suspension compressor, P ratio ≥ P m indicates that the air suspension compressor has a surge risk;

Wherein, P ratio is the ratio between the suction pressure and the discharge pressure of the air suspension compressor, P m is the pressure ratio threshold; φ is the offset of the rotor axis of the air suspension compressor, φ max is the maximum allowable offset of the rotor axis.
A device for controlling a refrigerant circulation system, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute any one of claims 1 to 8 when running the program instructions. A method for controlling a refrigerant circulation system described herein.
A refrigerant circulation system, characterized in that it comprises:

Refrigerant circulation loop, including: air suspension compressor, first heat exchanger and second heat exchanger;

A cooling water circulation pipeline communicates with the first heat exchanger, and the cooling water pipeline is provided with a cooling water pump;

A chilled water circulation pipeline communicated with the second heat exchanger, and the chilled water pipeline is provided with a chilled water pump;

The air supply pipeline is connected with the air supply port of the air suspension compressor;

The gas supply pipeline is connected with the gas supply port of the air suspension compressor;

A bypass pipeline communicates between the first heat exchanger and the second heat exchanger;

The first branch is connected with the gas supply pipeline and is configured to supply refrigerant to the gas supply pipeline;

The second pipeline, which communicates with the supplementary gas pipeline, is configured to supply refrigerant to the supplementary gas pipeline; and,

The device for controlling the refrigerant circulation system as claimed in claim 9 .