WO2023126025A1

WO2023126025A1 - Refrigerant heat dissipation system for frequency converter of water chiller unit

Info

Publication number: WO2023126025A1
Application number: PCT/CN2023/078581
Authority: WO
Inventors: 赵俊志; 魏庆; 邓仁杰; 毕刘新
Original assignee: 天津飞旋科技股份有限公司
Priority date: 2021-12-31
Filing date: 2023-02-28
Publication date: 2023-07-06
Also published as: CN113993361B; CN113993361A

Abstract

Provided in the present application is a refrigerant heat dissipation system for a frequency converter of a water chiller unit. The system comprises: a refrigeration loop, which is configured to provide to a heat dissipation loop a liquid refrigerant for heat dissipation; the heat dissipation loop, which is configured to perform heat exchange with a first refrigerant by using a high-temperature gaseous refrigerant in the refrigeration loop, perform heat dissipation on a frequency converter cooling plate by using a refrigerant that has completed heat exchange, or perform heat dissipation on the frequency converter cooling plate by directly using the first refrigerant, and convey to the refrigeration loop the refrigerant that has completed heat exchange, wherein the first refrigerant is a liquid refrigerant conveyed by the refrigeration loop; and a control system, which is configured to collect temperature data, control, according to the temperature data, whether the first refrigerant performs heat exchange with the high-temperature gaseous refrigerant, and control, according to the temperature data, the flow of the refrigerant that has completed heat exchange, or the flow of the first refrigerant, wherein the temperature data comprises the current temperature of the first refrigerant, the current temperature of the frequency converter cooling plate, and a dew point temperature of the frequency converter cooling plate.

Description

Chiller inverter refrigerant cooling system

This disclosure claims priority to a Chinese patent application with application number 202111647954.8 filed with the China Patent Office on December 31, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of equipment control, for example, it relates to a chiller inverter refrigerant cooling system.

Background technique

Frequency conversion chillers are more and more widely used in the refrigeration industry due to their high energy efficiency. Among them, the heat dissipation requirements of the internal power module of the inverter increase with the increase of operating power, and conventional air-cooled heat dissipation is difficult to meet the heat dissipation requirements. The refrigerant (refrigerant) used in the chiller can be used as a working medium for cooling the variable frequency power module, and has a wide operating temperature range and can absorb heat by utilizing its latent heat of vaporization.

The solution of the related art usually takes the refrigerant directly from the condenser of the chiller or after specific throttling and cooling of the refrigerant, and then passes the refrigerant into the radiator of the variable frequency power module to take away the heat generated by the power module. However, due to the low temperature of the refrigerant, the power module of the inverter has a potential risk of condensation under special working conditions, resulting in the chiller not working properly.

Contents of the invention

The present application provides a chiller inverter refrigerant heat dissipation system to alleviate the technical problem in the related art that condensation occurs in the inverter heat dissipation module when the refrigerant temperature is low.

An embodiment of the present application provides a chiller inverter refrigerant heat dissipation system, including: a refrigeration circuit, a heat dissipation circuit and a control system, wherein the heat dissipation circuit is connected to the control system and the refrigeration circuit respectively;

The refrigeration circuit is configured to provide liquid refrigerant for heat dissipation for the heat dissipation circuit, wherein the liquid refrigerant includes at least one of the following: a first refrigerant and a second refrigerant, and the first refrigerant is delivered to the heat dissipation circuit A liquid refrigerant, the second refrigerant is a refrigerant passing through the refrigeration circuit;

The heat dissipation circuit is set to use the high-temperature gaseous refrigerant in the refrigeration circuit to exchange heat with the first refrigerant, and use the refrigerant that has completed the heat exchange to dissipate heat from the cold plate of the frequency converter, or is configured to directly use the first refrigerant A refrigerant dissipates heat to the cold plate of the frequency converter, and transports the refrigerant that has dissipated heat to the refrigeration circuit;

The control system is configured to collect the temperature data, and control whether the first refrigerant exchanges heat with the high-temperature gaseous refrigerant according to the temperature data, and control the The flow rate of the refrigerant that has completed the heat exchange or the flow rate of the first refrigerant, wherein the temperature data includes: the current temperature of the first refrigerant, the current temperature of the inverter cold plate, and the current temperature of the inverter cold plate dew point temperature;

Wherein, the heat dissipation circuit includes: a flow distribution valve, an auxiliary heat exchange device, a frequency converter cooling device and a flow regulating valve, wherein the flow distribution valve is connected to the condenser in the refrigeration circuit and the frequency converter heat dissipation device connected, and the auxiliary heat exchange device is respectively connected with the flow distribution valve and the inverter cooling device, and the flow regulating valve is respectively connected with the inverter cooling device and the evaporator in the refrigeration circuit ;

The flow distribution valve is configured to deliver the first refrigerant to the auxiliary heat exchange device or the inverter cooling device;

The auxiliary heat exchange device is configured to use the high-temperature gaseous refrigerant to exchange heat with the first refrigerant;

The cooling device for the frequency converter is configured to use the refrigerant that has completed heat exchange or the first refrigerant to dissipate heat from the cold plate of the frequency converter, and transport the refrigerant that has completed heat dissipation to the cooling plate through the flow regulating valve. the evaporator;

Wherein, the type of the flow distribution valve is an electronic three-way valve or a solenoid valve, a first flow path and a second flow path are included between the condenser and the heat sink of the frequency converter, and the auxiliary heat exchange device includes: the The pipeline between the compressor and the condenser in the refrigeration circuit and the first flow path.

Description of drawings

In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the related technologies, the following will introduce the drawings that need to be used in the descriptions of the specific embodiments or related technologies. The drawings in the following description are some implementations of the application For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic diagram of the first chiller refrigerant cooling system provided by the embodiment of the present application;

FIG. 2 is a flow diagram of the second chiller refrigerant heat dissipation system provided by the embodiment of the present application;

Fig. 3 is a flow path diagram of the refrigerant heat dissipation system of the chiller in the third embodiment provided by the embodiment of the present application;

Fig. 4 is a temperature control flow chart of a chiller cooling medium cooling system provided by the embodiment of the present application.

Reference signs:

100. Refrigeration circuit; 200. Heat dissipation circuit; 300. Control system;

1. Heat dissipation flow path; 10. Compressor; 11. First flow path; 12. Second flow path; 13. Flow path; 20. Condenser; 30. Throttling device; 40. Evaporator; 50. Flow distribution valve ; 60. Auxiliary heat exchange device; 70. Frequency converter cooling device; 80. Flow regulating valve;

101, the first compressor; 102, the outlet pipeline of the compressor; 103, the second compressor; 601, the first A temperature sensor; 602, a second temperature sensor; 603, a third temperature sensor.

Detailed ways

The technical solutions of the present application will be described below in conjunction with the accompanying drawings, and the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Embodiment one:

According to an embodiment of the present application, an embodiment of a cooling system for a frequency converter of a chiller is provided. Fig. 1 is a schematic diagram of a chiller inverter refrigerant heat dissipation system according to an embodiment of the present application. As shown in Fig. 1, the chiller inverter refrigerant heat dissipation system includes: a refrigeration circuit 100, a heat dissipation circuit 200 and a control system 300, wherein , the cooling circuit 200 is connected to the control system 300 and the refrigeration circuit 100 respectively;

The refrigeration circuit 100 is configured to provide the heat dissipation circuit 200 with a liquid refrigerant for heat dissipation, wherein the liquid refrigerant includes at least one of the following: a first refrigerant and a second refrigerant, and the first refrigerant is delivered to the The liquid refrigerant of the cooling circuit 200, the second refrigerant is the refrigerant passing through the refrigeration circuit 100;

Exemplarily, the refrigeration circuit 100 compresses the low-temperature gaseous refrigerant to obtain a high-temperature gaseous refrigerant, then condenses the high-temperature gaseous refrigerant to obtain a liquid refrigerant, and finally delivers the liquid refrigerant to the heat dissipation circuit 200 and At least one of the refrigeration circuits 100 .

The heat dissipation circuit 200 is configured to use the high-temperature gaseous refrigerant in the refrigeration circuit 100 to exchange heat with the first refrigerant, and use the refrigerant that has completed the heat exchange or the first refrigerant to dissipate heat from the cold plate of the frequency converter, or set to directly using the first refrigerant to dissipate heat from the cold plate of the frequency converter, and transport the refrigerant that has dissipated heat to the refrigeration circuit 100, wherein the first refrigerant is transported by the refrigeration circuit 100 to the heat dissipation circuit 200 liquid refrigerant;

The control system 300 is configured to collect the temperature data, and control whether the first refrigerant performs heat exchange with the high-temperature gaseous refrigerant according to the temperature data, and control the process of completing the heat exchange according to the temperature data. The flow rate of the refrigerant or the flow rate of the first refrigerant, wherein the temperature data includes: the current temperature of the first refrigerant, the current temperature of the inverter cold plate and the dew point temperature of the inverter cold plate.

In the embodiment of the present application, the chiller inverter refrigerant heat dissipation system includes: a refrigeration circuit 100, a heat dissipation circuit 200 and a control system 300, wherein the heat dissipation circuit 200 is connected to the control system 300 and the refrigeration circuit 100 respectively The refrigeration circuit 100 is configured to provide liquid refrigerant for heat dissipation for the heat dissipation circuit 200; the heat dissipation circuit 200 is configured to use the high-temperature gas refrigerant in the refrigeration circuit 100 to exchange heat with the first refrigerant, and utilize the The refrigerant that has completed heat exchange or the first refrigerant dissipates heat to the cold plate of the frequency converter, and transports the refrigerant that has completed heat dissipation to the refrigeration circuit 100, wherein the first refrigerant A refrigerant is a liquid refrigerant transported by the refrigeration circuit 100; the control system 300 is configured to collect the temperature data, and control whether the first refrigerant exchanges heat with the high-temperature gas refrigerant according to the temperature data, and controlling the flow rate of the refrigerant that has completed the heat exchange or the flow rate of the first refrigerant according to the temperature data, wherein the temperature data includes: the current temperature of the first refrigerant, the current temperature of the cold plate of the frequency converter temperature and the dew point temperature of the inverter cold plate. The above chiller inverter refrigerant cooling system achieves the purpose of preventing condensation during the operation of the inverter, and further solves the technical problem in the related art that causes condensation in the inverter cooling module when the refrigerant temperature is low, thereby achieving It achieves the technical effect of preventing the condensation that occurs during the operation of the frequency converter.

In the embodiment of the present application, as shown in Figure 2 and Figure 3, the refrigeration circuit 100 includes: a compressor 10, a condenser 20, a throttling device 30 and an evaporator 40, wherein the compressor 10 is connected to the The condenser 20 is connected with the evaporator 40, and the throttling device 30 is connected with the condenser 20 and the evaporator 40 respectively;

The compressor 10 is configured to compress the low-temperature gaseous refrigerant to obtain the high-temperature gaseous refrigerant;

It should be noted that the number of the compressor 10 is at least one. When the number of the compressors 10 is plural, the plural compressors 10 are connected in series.

The condenser 20 is configured to condense the high-temperature gaseous refrigerant to obtain the liquid refrigerant, and perform at least one of the following: delivering the first refrigerant to the heat dissipation circuit 200 and transferring the second refrigerant Delivered to the evaporator 40 through the throttling device 30;

The evaporator 40 is configured to evaporate the second refrigerant and the refrigerant that has radiated heat to the cold plate of the frequency converter to obtain the low-temperature gaseous refrigerant.

In the embodiment of the present application, the cooling circuit 200 includes: a flow distribution valve 50 , an auxiliary heat exchange device 60 , a frequency converter cooling device 70 and a flow regulating valve 80 , wherein the flow distribution valve 50 and the condenser 20 It is connected with the frequency converter cooling device 70, and the auxiliary heat exchange device 60 is connected with the flow distribution valve 50 and the frequency converter cooling device 70 respectively, and the flow regulating valve 80 is respectively connected with the frequency converter The heat sink 70 is connected to the evaporator 40;

The flow distribution valve 50 is configured to deliver the first refrigerant to the auxiliary heat exchange device 60 or the inverter cooling device 70;

The auxiliary heat exchange device 60 is configured to use the high-temperature gaseous refrigerant to exchange heat with the first refrigerant;

It should be noted that, when the type of the flow distribution valve 50 is an electronic three-way valve, as shown in FIG. 2 , the auxiliary heat exchange device 60 includes: the compressor 10 and the condenser 20 The pipeline between and the pipeline between the first output end of the electronic three-way valve and the heat sink 70 of the frequency converter.

When there are multiple compressors 10, the auxiliary heat exchange device 60 can be arranged at the outlet of the second-stage compressor or the outlet of the first-stage compressor. Exemplarily, the auxiliary heat exchange device 60 is placed at the outlet of the primary compressor.

The inverter cooling device 70 is configured to use the refrigerant that has completed the heat exchange or the first refrigerant The cold plate of the frequency converter is used to dissipate heat, and the refrigerant that has dissipated heat is delivered to the evaporator 40 through the flow regulating valve 80 .

It should be noted that the type of the flow distribution valve 50 includes: an electronic three-way valve or a solenoid valve, and a first flow path 11 and a second flow path 12 are included between the condenser 20 and the inverter cooling device 70, The auxiliary heat exchange device 60 includes: a pipeline between the compressor 10 and the condenser 20 and the first flow path 11 .

As shown in Figure 2, if the type of the flow distribution valve 50 is an electronic three-way valve, the condenser 20 is connected to the input end of the electronic three-way valve, and the first flow path 11 is the electronic three-way valve. The pipeline between the first output end of the three-way valve and the inverter cooling device 70, the second flow path 12 is between the second output end of the electronic three-way valve and the inverter cooling device 70 pipelines between.

As shown in FIG. 3 , if the type of the flow distribution valve 50 is a solenoid valve, the first flow path 11 includes: the pipeline between the solenoid valve and the inverter cooling device 70 and the condenser 20 and the inverter cooling device 70 , the second flow path 12 includes: the pipeline between the condenser 20 and the inverter cooling device 70 .

In the embodiment of the present application, as shown in Figure 2, the two-stage compressor includes: a first compressor 101 and a second compressor 103, and the two-stage compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant Working fluid; the compressor outlet pipeline 102 (that is, the pipeline between the compressor 10 and the condenser 20 ) communicates with the compressor 10 outlet and the condenser 20 inlet. The high-temperature gaseous refrigerant exchanges heat with the cold liquid refrigerant through the auxiliary heat exchange device 60 and the first flow path 11 (that is, the pipeline between the first output end of the electronic three-way valve and the inverter cooling device 70), and the auxiliary heat exchange The thermal device 60 absorbs heat from the high-temperature gaseous refrigerant to increase the temperature of the refrigerant in the first flow path 11 . The refrigerant is condensed by the condenser 20 into a low-temperature and high-pressure liquid refrigerant, and the liquid refrigerant flows out from the outlet of the condenser 20 and is throttled by the throttling device 30 to become a low-temperature and low-pressure two-phase refrigerant, and then flows out to the inlet of the evaporator 40, where it evaporates and absorbs heat through the evaporator 40 Become a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant flows back to the first compressor 101 from the outlet of the evaporator 40 to complete a refrigeration cycle.

For the frequency converter heat dissipation circuit 200, the outlet of the condenser 20 and the inlet of the flow distribution valve 50 are connected through the heat dissipation flow path 1 (that is, the pipeline between the condenser 20 and the flow distribution valve 50), according to the temperature of the first refrigerant detected by the temperature sensor The current temperature judges the opening direction of the flow distribution valve 50, and guides the refrigerant into the first flow path 11 and the second flow path 12; the first flow path 11 communicates with the outlet of the flow distribution valve 50, the auxiliary heat exchange device 60 and the inlet of the frequency converter cooling device 70; The machine outlet pipeline 102 and the first flow path 11 pipeline constitute the auxiliary heat exchange device 60; the second flow path 12 is connected to the outlet of the flow distribution valve 50 and the inlet of the inverter cooling device 70; the flow path 13 is connected to the outlet of the inverter cooling device 70 and the flow rate Regulator valve 80 inlet.

The refrigerant absorbs the heat generated by the insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) or the rectifier diode module in the inverter cooling device 70, and flows out to the flow path 13 after heat exchange (that is, the flow regulating valve 80 and the evaporator 40 The pipeline between them) returns to the evaporator 40 through a throttling device 30 (such as an electronic expansion valve or a solenoid valve).

In the embodiment of the present application, the control system 300 includes: a controller and a temperature sensor.

The controller is configured to control whether the first refrigerant is compatible with the high temperature according to the temperature data performing heat exchange with the gaseous refrigerant, and controlling the flow rate of the refrigerant that has completed the heat exchange or the flow rate of the first refrigerant according to the temperature data;

The temperature sensor is configured to collect the temperature data.

In the embodiment of the present application, the controller includes: a first control unit and a second control unit.

The first control unit is configured to control the flow distribution valve 50 after the difference between the current temperature of the first refrigerant and the dew point temperature is less than or equal to a preset temperature and reaches a preset first duration. Sending the first refrigerant to the auxiliary heat exchange device 60, and sending the refrigerant that has completed the heat exchange to the inverter cooling device 70;

The first control unit is configured to, after the difference between the current temperature of the first refrigerant and the dew point temperature is greater than a preset temperature and reaches a preset first duration, control the flow distribution valve 50 to the The first refrigerant is delivered to the heat sink device 70 of the frequency converter;

The second control unit is configured to control the opening and closing degree of the flow regulating valve 80 to increase after the current temperature of the cold plate of the frequency converter is greater than or equal to the upper limit of the preset temperature range and reaches a preset second duration;

The second control unit is configured to control the opening and closing degree of the flow regulating valve 80 to decrease after the current temperature of the cold plate of the frequency converter is less than or equal to the lower limit of the preset temperature range and reaches a preset third time period.

The first control unit is configured to control the flow distribution valve 50 to deliver the first refrigerant to the auxiliary heat exchange device 60 when the current temperature of the first refrigerant is less than or equal to a preset temperature;

The first control unit is configured to control the flow distribution valve 50 to deliver the first refrigerant to the inverter cooling device 70 when the current temperature of the first refrigerant is greater than a preset temperature;

The second control unit is configured to control the opening and closing degree of the flow regulating valve 80 to increase when the current temperature of the cold plate of the frequency converter is greater than or equal to the upper limit of the preset temperature range;

The second control unit is configured to control the opening and closing degree of the flow regulating valve 80 to decrease when the current temperature of the cold plate of the frequency converter is less than or equal to the lower limit of the preset temperature range.

As shown in FIG. 2, the temperature sensors include: a first temperature sensor 601, a second temperature sensor 603 and a third temperature sensor 602, wherein the first temperature sensor 601 is set between the flow distribution valve 50 and the On the pipeline between the condensers 20, the second temperature sensor 603 is arranged on the cold plate of the inverter, and the third temperature sensor 602 is arranged inside the box of the inverter;

The first temperature sensor 601 is configured to detect the current temperature of the first refrigerant;

The second temperature sensor 603 is configured to detect the current temperature of the cold plate of the frequency converter;

The third temperature sensor 602 is configured to detect the dew point temperature of the cold plate of the frequency converter.

In the embodiment of the present application, the first temperature sensor 601 is arranged at the outlet of the condenser 20, and is arranged to detect the inlet temperature of the refrigerant (that is, the current temperature of the first refrigerant) T _ri , and the second temperature sensor 603 is arranged on the cold plate, and is arranged to To detect the cold plate temperature (ie, the current temperature of the inverter cold plate) T _b , the third temperature sensor 602 is configured to detect the dew point temperature T _d of the cold plate.

As shown in Figure 4, the working process of the above-mentioned chiller inverter refrigerant cooling system is as follows:

Before the inverter is running, it is necessary to set the initial opening direction and opening degree for the flow distribution valve 50 and the flow regulating valve 80 respectively, so as to cool the cold plate at the initial stage of work. Adjust the direction and degree of opening. The initial opening can be the maximum opening of the valve or a set opening.

In order to prevent condensation, excessive temperature of the cold plate and unnecessary amount of refrigerant to meet heat dissipation requirements, it is necessary to set a preset temperature range [T ₁ , T ₂ ] that meets the safe operation requirements of the inverter. Wherein, the lower limit of the preset temperature range T ₁ is the lower limit temperature allowed by the inverter to safely operate the cold plate, and the upper limit of the preset temperature range T ₂ is the upper limit temperature allowed by the inverter to safely operate the cold plate. The upper limit T ₂ of the preset temperature range is greater than the lower limit T ₁ of the preset temperature range.

It should be noted that the lower limit _T1 of the preset temperature range can be determined by the dew point temperature _Td monitored by the temperature sensor inside the cold plate box, that is, _T1 = _Td + _C1 , and _C1 is the preset first temperature, which can be taken as 0-10 degrees Celsius (°C). The upper limit T ₂ of the preset temperature range can be determined by the maximum limit temperature T _max of the cold plate, that is, T ₂ =T _max −C ₂ , and C ₂ is the second preset temperature, which can be 5-8°C. The maximum limit temperature T _max of the cold plate can be obtained through experiments or calculations according to the maximum junction temperature or power allowed by the power devices installed on the cold plate of the frequency converter.

If the difference between the detected refrigerant inlet temperature T _ri and the dew point temperature T _d is not higher than the preset temperature C and lasts for the preset first time period t ₁ , the flow distribution valve 50 is opened to the first flow path 11, and through the auxiliary switch The thermal device 60 heats the first refrigerant, increases the temperature of the first refrigerant, obtains the refrigerant that has completed the heat exchange, and transports the refrigerant that has completed the heat exchange to the cold plate; if the detected refrigerant inlet temperature _Tri and the dew point temperature T _d If the difference is higher than the preset temperature and lasts for the preset first time period t ₁ , the flow distribution valve 50 is opened to the second flow path 12 so that the first refrigerant directly dissipates heat to the cold plate. Considering sensor measurement errors and accidental factors, the preset temperature C above can be 0-3°C. Through the above method, it can always ensure that the temperature of the refrigerant entering the cold plate for heat dissipation is high enough, eliminating the risk of condensation on the cold plate.

After the first refrigerant or the refrigerant that has completed the heat exchange enters the cold plate, it is necessary to detect the relationship between the current temperature T _b of the cold plate and the above-mentioned preset temperature range [T ₁ , T ₂ ], if the current temperature of the cold plate is greater than Or equal to the upper limit of the preset temperature range T ₂ and after reaching the preset second time period t ₂ , the opening and closing degree of the control flow regulating valve 80 increases; if the current temperature of the cold plate is less than or equal to the lower limit of the preset temperature range T ₁ and reaches the preset After the third time period _t3 , the opening and closing degree of the control flow regulating valve 80 decreases; if the current temperature of the cold plate is within the preset temperature range, the opening and closing degree of the control flow regulating valve 80 remains unchanged.

As shown in Figure 4, when the frequency converter is running, the stop valve is open; when the frequency converter is not running, the stop valve is closed. The shut-off valve acts as a cut-off on the pipeline, which can control the cut-off or connection of the refrigerant.

The embodiment of the present application proposes to reduce the potential risk of condensation during the operation of the frequency converter by increasing the temperature of the inlet refrigerant, which solves the problem of condensation caused by low refrigerant temperature under special working conditions and reduces the safety risk. In this application, no additional auxiliary heating device is required, but the auxiliary heat exchange device 60 is provided to increase the temperature of the refrigerant by taking advantage of the high outlet temperature of the compressor 10 .

In addition, in the description of the embodiments of the present application, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; may be mechanically or electrically connected; may be directly connected, or An indirect connection through an intermediary may be an internal connection between two elements. Those of ordinary skill in the art can understand the meanings of the above terms in this application according to the situation.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplification of the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific orientation construction and operation. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication 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. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiment of the present application may be integrated into one processing unit, or each unit may physically exist independently, or two or more units may be integrated into one unit.

Claims

A chiller inverter refrigerant heat dissipation system, comprising: a refrigeration circuit (100), a heat dissipation circuit (200) and a control system (300), wherein the heat dissipation circuit (200) is connected to the control system (300) and the control system (300) respectively The refrigeration circuit (100) is connected;

The refrigeration circuit (100) is configured to provide liquid refrigerant for heat dissipation for the heat dissipation circuit (200), wherein the liquid refrigerant includes at least one of the following: a first refrigerant and a second refrigerant, and the first refrigerant is a liquid refrigerant delivered to the cooling circuit (200), and the second refrigerant is a refrigerant passing through the refrigeration circuit (100);

The heat dissipation circuit (200) is configured to use the high-temperature gaseous refrigerant in the refrigeration circuit (100) to exchange heat with the first refrigerant, and use the refrigerant that has completed the heat exchange to dissipate heat from the inverter cold plate, or set In order to directly use the first refrigerant to dissipate heat from the cold plate of the frequency converter, and transport the refrigerant that has dissipated heat to the refrigeration circuit (100);

The control system (300) is configured to collect temperature data, and control whether the first refrigerant performs heat exchange with the high-temperature gaseous refrigerant according to the temperature data, and control the process for completing the heat exchange according to the temperature data. The flow rate of the refrigerant or the flow rate of the first refrigerant, wherein the temperature data includes: the current temperature of the first refrigerant, the current temperature of the inverter cold plate and the dew point temperature of the inverter cold plate;

Wherein, the cooling circuit (200) includes: a flow distribution valve (50), an auxiliary heat exchange device (60), a frequency converter cooling device (70) and a flow regulating valve (80), wherein the flow distribution valve (50 ) is connected with the condenser (20) in the refrigeration circuit (100) and the inverter cooling device (70), and the auxiliary heat exchange device (60) is connected with the flow distribution valve (50) and the The frequency converter cooling device (70) is connected, and the flow regulating valve (80) is respectively connected with the frequency converter cooling device (70) and the evaporator (40) in the refrigeration circuit (100);

The flow distribution valve (50) is configured to deliver the first refrigerant to the auxiliary heat exchange device (60) or the inverter cooling device (70);

The auxiliary heat exchange device (60) is configured to use the high-temperature gaseous refrigerant to exchange heat with the first refrigerant;

The inverter cooling device (70) is configured to use the refrigerant that has completed the heat exchange or the first refrigerant to dissipate heat from the inverter cold plate, and pass the flow regulating valve (80) to complete the heat exchange. The radiated refrigerant is delivered to the evaporator (40);

Wherein, the type of the flow distribution valve (50) is an electronic three-way valve or a solenoid valve, and the condenser (20) and the inverter cooling device (70) include a first flow path (11) and a second A flow path (12), the auxiliary heat exchange device (60) comprising: a pipeline between the compressor (10) and the condenser (20) in the refrigeration circuit (100) and the first flow path (11).
The refrigerant cooling system according to claim 1, wherein the refrigeration circuit (100) comprises: a compressor (10), a condenser (20), a throttling device (30) and an evaporator (40), wherein the The compressor (10) is connected with the condenser (20) and the evaporator (40) respectively, and the throttling device (30) is connected with the condenser (20) and the evaporator (40) respectively. ) are connected;

The compressor (10) is configured to compress the low-temperature gaseous refrigerant to obtain the high-temperature gaseous refrigerant;

The condenser (20) is configured to condense the high-temperature gaseous refrigerant to obtain the liquid refrigerant, and perform at least one of the following: delivering the first refrigerant to the heat dissipation circuit (200) and transferring the The second refrigerant is delivered to the evaporator (40) through the throttling device (30);

The evaporator (40) is configured to complete the cooling of the second refrigerant and the cold plate of the frequency converter The refrigerant that dissipates heat is evaporated to obtain the low-temperature gaseous refrigerant.
The refrigerant cooling system according to claim 1, wherein the type of the flow distribution valve (50) is an electronic three-way valve, and the condenser (20) is connected to the input end of the electronic three-way valve, so The first flow path (11) is the pipeline between the first output end of the electronic three-way valve and the inverter cooling device (70), and the second flow path (12) is the pipeline between the electronic three-way valve The pipeline between the second output end of the valve and the cooling device (70) of the frequency converter.
The refrigerant cooling system according to claim 1, wherein the type of the flow distribution valve (50) is a solenoid valve, and the first flow path (11) includes: the solenoid valve and the frequency converter cooling device (70 ) and the pipeline between the condenser (20) and the inverter cooling device (70), the second flow path (12) includes: the condenser (20) and the The pipeline between the inverter heat sink (70) mentioned above.
The refrigerant cooling system according to claim 1, wherein the control system (300) comprises: a temperature sensor and a controller, wherein,

The temperature sensor is configured to collect the temperature data;

The controller is configured to control whether the first refrigerant exchanges heat with the high-temperature gaseous refrigerant according to the temperature data, and control the flow rate of the refrigerant that has completed the heat exchange or the first refrigerant according to the temperature data. Refrigerant flow.
The refrigerant cooling system according to claim 5, wherein the controller comprises: a first control unit and a second control unit, wherein,

The first control unit is configured to control the flow distribution valve after the difference between the current temperature of the first refrigerant and the dew point temperature is less than or equal to a preset temperature and reaches a preset first duration (50) transporting the first refrigerant to the auxiliary heat exchange device (60), and transporting the refrigerant that has completed heat exchange to the inverter cooling device (70);

The first control unit is configured to control the flow distribution after the difference between the current temperature of the first refrigerant and the dew point temperature is greater than the preset temperature and reaches the preset first duration The valve (50) transports the first refrigerant to the inverter cooling device (70);

The second control unit is configured to control the opening and closing degree of the flow regulating valve (80) to increase after the current temperature of the cold plate of the frequency converter is greater than or equal to the upper limit of the preset temperature range and reaches a preset second duration. big;

The second control unit is configured to control the opening of the flow regulating valve (80) after the current temperature of the cold plate of the frequency converter is less than or equal to the lower limit of the preset temperature range and reaches a preset third time period. The fit is reduced.
The refrigerant cooling system according to claim 2, wherein the number of the compressor (10) is at least one, and when the number of the compressor (10) is multiple, the number of the compressors (10) connected in series.
The refrigerant cooling system according to claim 5, wherein the temperature sensor comprises: a first temperature sensor (601), a second temperature sensor (603) and a third temperature sensor (602), wherein the first temperature The sensor (601) is set on the pipeline between the flow distribution valve (50) and the condenser (20), the second temperature sensor (603) is set on the cold plate of the inverter, and the first Three temperature sensors (602) are arranged inside the box body of the frequency converter;

The first temperature sensor (601) is configured to detect the current temperature of the first refrigerant;

The second temperature sensor (603) is configured to detect the current temperature of the cold plate of the frequency converter; The third temperature sensor (602) is configured to detect the dew point temperature of the cold plate of the frequency converter.