Refrigeration system and control method thereof

Abstract

The present invention provides a refrigeration system and a control method thereof. The refrigeration system includes a cooling circuit and a compressor, an evaporator assembly and a condenser assembly sequentially arranged on the cooling circuit. The refrigeration system also includes: a liquid pump cooling assembly, which is arranged on the cooling circuit and located between the condenser assembly and the evaporator assembly. The liquid pump cooling assembly includes a shell and a liquid pump arranged in the shell. The shell defines a cavity with a liquid storage function, a refrigerant inlet connected to the cavity, a first outlet connected to the cavity and a second outlet connected to the liquid pump. The outlet of the condenser assembly is connected to the refrigerant inlet, and the first outlet and the second outlet are both connected to the inlet of the evaporator assembly; a control assembly is connected to the compressor and the liquid pump so that the refrigeration system has a direct expansion refrigeration mode and a pumping refrigerant energy-saving mode. The refrigeration system and the control method thereof are small in size and consume less energy.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning and refrigeration, and in particular to a refrigeration system and a control method thereof. Background Art

[0002] At present, in the field of air conditioning and refrigeration, two refrigeration systems are usually used: compressor refrigeration cycle and fluorine pump refrigeration cycle. The refrigerant consumption of these two refrigeration cycles is different. Therefore, in order to balance the refrigerant consumption of the two, a liquid storage tank is generally added between the fluorine pump and the outdoor unit to temporarily store excess refrigerant in the circulation loop. However, this increases the amount of refrigerant in the system and also increases the cost of the system. Once the system leaks, it will have a great impact on the environment. In addition, since a large amount of excess refrigerant needs to be stored, the liquid storage tank needs to occupy a large volume, which leads to an increase in the volume of the entire refrigeration system. Summary of the invention

[0003] The main purpose of the present invention is to provide a refrigeration system and a control method thereof, which have a smaller volume and lower energy consumption.

[0004] In order to achieve the above-mentioned object, according to one aspect of the present invention, a refrigeration system is provided. The refrigeration system includes a cooling circuit and a compressor, an evaporator assembly and a condenser assembly arranged in sequence on the cooling circuit. The refrigeration system also includes: a liquid pump cooling assembly arranged on the cooling circuit and located between the condenser assembly and the evaporator assembly. The liquid pump cooling assembly includes a shell and a liquid pump arranged in the shell. The shell defines a cavity with a liquid storage function, a refrigerant inlet connected to the cavity, a first outlet connected to the cavity and a second outlet connected to the liquid pump. The outlet of the condenser assembly is connected to the refrigerant inlet, and the first outlet and the second outlet are both connected to the inlet of the evaporator assembly; a control assembly, the compressor and the liquid pump are respectively connected to the control assembly. The refrigeration system is connected so that the refrigeration system has a direct expansion refrigeration mode and a pumped refrigerant energy-saving mode; in the direct expansion refrigeration mode, the compressor is in an open state and compresses the refrigerant in the vapor phase, the liquid pump is in a closed state, and the refrigerant flowing out of the outlet of the condenser assembly enters the evaporator assembly through the refrigerant inlet and the first outlet in sequence, so that the refrigerant circulates in the cooling circuit through the compressor; in the pumped refrigerant energy-saving mode, the liquid pump is in an open state and pumps the refrigerant in the liquid state, the compressor is in a closed state, and under the action of the liquid pump, the refrigerant flowing out of the outlet of the condenser assembly flows out from the second outlet and enters the evaporator assembly.

[0005] Furthermore, the refrigeration system also includes: a first pipeline, one end of which is connected to the second outlet, and the other end of the first pipeline is connected to the inlet of the evaporator assembly; a first one-way valve, which is arranged on the cooling circuit and is located between the refrigerant inlet and the connection node between the first pipeline and the cooling circuit, and the first one-way valve is used to prevent the refrigerant from flowing back to the refrigerant inlet. When the refrigeration system is in the energy-saving state of pumping refrigerant, the refrigerant flowing out from the outlet of the condenser assembly flows into the evaporator assembly through the first pipeline.

[0006] Furthermore, along the vertical direction, the height dimension of the first outlet is smaller than the height dimension of the second outlet, and the refrigerant inlet is located between the first outlet and the second outlet, the liquid pump is located below the cavity, and the inner cavity of the liquid pump is connected to the cavity.

[0007] Furthermore, the refrigeration system also includes: a second pipeline, which is arranged in parallel with the compressor, one end of the second pipeline is connected to the outlet of the evaporator assembly, and the other end of the second pipeline is connected to the inlet of the condenser assembly; a second one-way valve is arranged on the second pipeline.

[0008] Furthermore, the refrigeration system further comprises a solenoid valve arranged on the cooling circuit, and the solenoid valve is located between a connection node between the second pipeline and the cooling circuit and an inlet of the compressor.

[0009] Furthermore, the condenser assembly includes: a condenser body having a condensation inlet and a condensation outlet; an air collecting pipe connected to the condensation inlet and connected to the outlet of the compressor; a liquid collecting pipe connected to the condensation outlet and connected to the refrigerant inlet, wherein the diameter of the liquid collecting pipe is larger than the diameter of the air collecting pipe.

[0010] Furthermore, the condenser body is V-shaped, and the condenser assembly also includes a condensing fan arranged above the condenser body. The condenser assembly includes a first branch pipe and a second branch pipe. The gas collecting pipe is connected to the outlet of the compressor through the first branch pipe, and the liquid collecting pipe is connected to the refrigerant inlet through the second branch pipe.

[0011] Furthermore, the refrigeration system also includes: an expansion valve, which is arranged between the evaporator assembly and the liquid pump cooling assembly; a first temperature sensor, which is located upstream of the expansion valve along the flow direction of the refrigerant in the cooling circuit to detect the temperature of the refrigerant entering the evaporator assembly.

[0012] According to another aspect of the present invention, a control method using the above-mentioned refrigeration system is provided, the control method comprising: an energy-saving refrigeration step of controlling the refrigeration system to be in a pumping refrigerant energy-saving mode; and a compression refrigeration step of controlling the refrigeration system to be in a direct expansion refrigeration mode.

[0013] Furthermore, the condenser assembly includes a condenser body and a condensing fan located on one side of the condenser body. After the energy-saving refrigeration step, the control method also includes: determining the pressure value of the second outlet and the pressure value of the refrigerant inlet; a pressure value judgment step of judging whether the pressure value of the second outlet of the liquid pump cooling assembly is greater than the pressure value of the refrigerant inlet, and if so, executing the step of adjusting the speed of the condensing fan or the liquid pump; if not, executing the abnormality handling step.

[0014] Furthermore, after the energy-saving refrigeration step, the control method also includes: a detection step of detecting the temperature of the refrigerant entering the evaporator assembly; a temperature judgment step of judging whether the temperature of the refrigerant is less than zero degrees, and if so, executing the step of adjusting the speed of the condensing fan of the condenser assembly; if not, repeating the temperature judgment step.

[0015] Furthermore, in the compression refrigeration step, the control method also includes an adjustment step of adjusting the rotation speed of the compressor.

[0016] By applying the technical solution of the present invention, the evaporator assembly is used to evaporate the incoming liquid refrigerant into a gaseous refrigerant, and to flow out a low-temperature and low-pressure refrigerant gas; the condenser assembly can perform the function of heat dissipation, condensing the gaseous refrigerant into a liquid refrigerant; the compressor is used to compress the incoming low-pressure refrigerant gas into a superheated high-pressure refrigerant gas, and the compressor can drive the refrigerant to circulate in the cooling circuit. The liquid pump cooling assembly includes a shell and a liquid pump arranged in the shell, so that the shell defines a cavity with a liquid storage function, so that the cavity and the liquid pump are used as a modular structure, and there is no need to set up a separate liquid storage tank. After such arrangement, the liquid pump cooling assembly is small in size and compact in structure. Such arrangement can also reduce the amount of refrigerant filled in the refrigeration system, thereby achieving the function of reducing energy consumption and reducing costs; at the same time, since the above-mentioned liquid pump cooling assembly is equipped with an inlet and two outlets (a first outlet and a second outlet), the refrigerant can be transported to different pipelines through the two outlets, and the refrigeration system can have a direct expansion refrigeration mode and a pumping refrigerant energy-saving mode, thereby realizing the function of integrating the two refrigeration modes into the same cooling circuit; in addition, through a control assembly connected to the compressor and the liquid pump, the switching of the above-mentioned two refrigeration modes can also be achieved according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram showing a principle of an embodiment of a refrigeration system according to the present invention is shown;

[0019] Figure 2 It shows that according to the present invention Figure 1 A schematic diagram of the structure of a liquid pump cooling assembly;

[0020] Figure 3 It shows that according to the present invention Figure 1 A schematic diagram of the structure of a condenser assembly;

[0021] Figure 4 A flow chart showing a method for controlling a refrigeration system according to the present invention; and

[0022] Figure 5 A specific flow chart of the control method of the refrigeration system according to the present invention is shown.

[0023] The above drawings include the following reference numerals:

[0024] 1. compressor; 2. solenoid valve; 3. second one-way valve; 4. third one-way valve; 5. second temperature sensor; 6. condenser assembly; 7. condensing fan; 8. first pressure sensor; 9. liquid pump cooling assembly; 10. first one-way valve; 11. second pressure sensor; 12. first temperature sensor; 13. expansion valve; 14. evaporator assembly; 15. indoor fan; 16. third temperature sensor; 17. condenser body; 18. gas collecting pipe; 19. liquid collecting pipe; 20. first branch pipe; 21. second branch pipe; 22. control assembly; 90. housing; 91. first outlet; 92. second outlet; 93. refrigerant inlet; 94. cavity; 95. liquid pump; 96. internal inlet; 97. internal outlet; 98. outlet pipe; 99. impeller; 100. cooling circuit; 200. first pipeline; 300. second pipeline. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] like Figure 1As shown, the present invention provides a refrigeration system. The refrigeration system of this embodiment includes a cooling circuit 100 and a compressor 1, an evaporator assembly 14, and a condenser assembly 6 which are sequentially arranged on the cooling circuit 100. The compressor 1, the evaporator assembly 14, and the condenser assembly 6 all have an inlet and an outlet, and the refrigeration system also includes a liquid pump cooling assembly 9, a control assembly 22, and an indoor fan 15. Among them, the liquid pump cooling assembly 9 is arranged on the cooling circuit 100 and is located between the condenser assembly 6 and the evaporator assembly 14. The liquid pump cooling assembly 9 includes a shell 90 and a liquid pump 95 arranged in the shell 90. The shell 90 defines a cavity 94 with a liquid storage function, a refrigerant inlet 93 connected to the cavity 94, a first outlet 91 connected to the cavity 94, and a second outlet 92 connected to the liquid pump 95. The outlet of the condenser assembly 6 is connected to the refrigerant inlet 93, and the first outlet 91 and the second outlet 92 are both connected to the inlet of the evaporator assembly 14; the control assembly 22 is connected to the compressor 1 and the liquid pump 95, so that the refrigeration system has a direct expansion system. Cold mode and pumping refrigerant energy-saving mode; in direct expansion refrigeration mode, the compressor 1 is in the open state and compresses the refrigerant in the vapor phase, the liquid pump 95 is in the closed state, and the refrigerant flowing out of the outlet of the condenser assembly 6 enters the evaporator assembly 14 through the refrigerant inlet 93 and the first outlet 91 in sequence, so that the refrigerant circulates in the cooling circuit 100 through the compressor 1; in the pumping refrigerant energy-saving mode, the liquid pump 95 is in the open state and pumps the refrigerant in the liquid state, the compressor 1 is in the closed state, and under the action of the liquid pump 95, the refrigerant flowing out of the outlet of the condenser assembly 6 flows out from the second outlet 92 and enters the evaporator assembly 14.

[0027] In the above technical solution, in the refrigeration system, the evaporator assembly 14 is used to evaporate the incoming liquid refrigerant into a gaseous refrigerant, and to flow out a low-temperature and low-pressure refrigerant gas; the condenser assembly 6 can play a heat dissipation function, and condense the gaseous refrigerant into a liquid refrigerant. When the refrigeration system is in the direct expansion refrigeration mode, the control assembly 22 controls the compressor 1 to be in the on state, and controls the liquid pump 95 to be in the off state. The compressor 1 is used to compress the incoming low-pressure refrigerant gas into a superheated high-pressure refrigerant gas, and the compressor 1 can drive the refrigerant to circulate in the cooling circuit 100; the outlet of the compressor 1 is connected to the inlet of the condenser assembly 6 to transport the gaseous refrigerant compressed by the compressor 1 to the condenser assembly 6.

[0028] The gaseous refrigerant dissipates heat in the condenser assembly 6, condenses into high-pressure saturated liquid refrigerant and flows out. The liquid refrigerant flows into the cavity from the refrigerant inlet 93 and flows out directly through the first outlet 91, and then enters the evaporator assembly 14, thereby realizing the circulation of the refrigerant in the cooling circuit 100.

[0029] When the refrigeration system is in the pumping refrigerant energy-saving mode, the control component 22 controls the compressor 1 to be in the closed state, controls the liquid pump 95 to be in the open state, and the condenser component 6 can flow out low-temperature and low-pressure liquid refrigerant; the outlet of the condenser component 6 is connected to the refrigerant inlet 93 of the liquid pump cooling component 9, and under the pumping action of the liquid pump 95, the liquid refrigerant is pumped into the evaporator component 14 through the second outlet 92. In this mode, the liquid refrigerant circulates in the cooling circuit bypassing the compressor 1. Therefore, the above-mentioned refrigeration system has a direct expansion refrigeration mode and a pumping refrigerant energy-saving mode.

[0030] In this way, when the outdoor temperature is high, the refrigeration system cannot use the outdoor temperature to cool the indoor equipment, and the refrigeration system turns on the direct expansion refrigeration mode. At this time, the compressor 1 is in the on state and the liquid pump 95 is in the off state; when the outdoor temperature is low and can meet the natural cooling requirements, the compressor 1 is in the off state and the liquid pump 95 is in the on state. The refrigerant can make full use of outdoor natural resources to cool the indoor equipment without passing through the compressor 1, thereby achieving the function of reducing energy consumption and reducing costs.

[0031] In one embodiment of the present invention, the liquid pump cooling assembly 9 includes a shell 90 and a liquid pump 95 arranged in the shell 90, so that the shell 90 defines a cavity 94 with a liquid storage function, so that the cavity 94 and the liquid pump 95 are used as a modular structure, and there is no need to set up a separate liquid storage tank. After such a setting, the liquid pump cooling assembly 9 has a small volume and a compact structure. Such a setting can also reduce the amount of refrigerant charged in the refrigeration system, thereby achieving the function of reducing energy consumption and reducing costs; at the same time, since the above-mentioned liquid pump cooling assembly 9 is provided with an inlet and two outlets (a first outlet 91 and a second outlet 92), the refrigerant can be transported to different pipelines through the two outlets, and the refrigeration system can have a direct expansion refrigeration mode and a pumping refrigerant energy-saving mode, thereby realizing the function of integrating the two refrigeration modes into the same cooling circuit 100; in addition, through the control assembly 22 connected to the compressor 1 and the liquid pump 95, the switching of the above-mentioned two refrigeration modes can also be realized according to demand.

[0032] In a specific embodiment, the liquid pump 95 may be a vertical centrifugal pump.

[0033] Preferably, the liquid pump 95 is a fluorine pump.

[0034] like Figure 2 As shown, in an embodiment of the present invention, along the vertical direction, the height dimension of the first outlet 91 is smaller than the height dimension of the second outlet 92, and the refrigerant inlet 93 is located between the first outlet 91 and the second outlet 92, the liquid pump 95 is located below the cavity 94, and the inner cavity of the liquid pump 95 is connected to the cavity 94.

[0035] Since the liquid pump cooling assembly 9 has a first outlet 91 and a second outlet 92, the flow path of the refrigerant in the refrigeration system in different modes can be ensured. The liquid pump 95 includes a pump housing, an impeller 99 and a motor located in the pump housing, etc. The pump housing defines the inner cavity of the liquid pump 95, and the pump housing is also provided with an inner inlet 96 communicating with the cavity 94 and an inner outlet 97 communicating with the second outlet 92, wherein the inner inlet 96 and the inner outlet 97 are both communicated with the inner cavity of the liquid pump 95.

[0036] Through the above arrangement, in the refrigerant pumping energy-saving mode, the liquid pump 95 can pump the refrigerant flowing into the liquid pump cooling assembly 9 to the cooling circuit 100 .

[0037] In the above technical solution, the liquid pump 95 is arranged below the cavity 94, so that sufficient liquid storage space is reserved for the cavity 94; in the vertical direction of the liquid pump cooling assembly 9, a second outlet 92, a refrigerant inlet 93 and a first outlet 91 are arranged in sequence from top to bottom, so that after flowing in from the refrigerant inlet 93, the refrigerant can move downward under the action of its own gravity and fill the inner cavity of the liquid pump 95; in the pumping refrigerant energy-saving mode, the liquid refrigerant located in the inner cavity of the liquid pump 95 flows out to the second outlet 92 through the inner outlet 97 under the pumping of the liquid pump 95, and flows into the cooling circuit 100; in the direct expansion refrigeration mode, the liquid pump 95 is in a closed state, and the refrigerant entering the liquid pump cooling assembly 9 passes through the cavity 94 and flows out directly from the first outlet 91 located at the bottom of the liquid pump cooling assembly 9.

[0038] Since the amount of refrigerant required in the direct expansion refrigeration mode and the pumped refrigerant energy-saving mode is different, the cavity 94 can be used to adjust the amount of refrigerant in the two modes. Specifically, the liquid pump cooling assembly 9 is composed of a cavity 94 with a certain liquid storage function and a liquid pump 95 from top to bottom. Among them, the liquid pump 95 includes an electric motor and an impeller 99. An inner inlet 96 and two inner outlets 97 for the impeller 99 to drive the refrigerant to discharge are opened on the liquid pump 95. The two inner outlets 97 are connected to the second outlet 92 through the outlet pipe 98. After the refrigerant enters the liquid pump cooling assembly 9 from the refrigerant inlet 93, it will fill the lower part due to the action of gravity. A first outlet 91 is opened on the lower shell 90, and an inner inlet 96 for the refrigerant to enter the impeller 99 cavity of the liquid pump 95 is opened on the liquid pump 95. Therefore, cavity 94 can adjust the refrigerant consumption of the two operating modes, and at the same time, when the refrigerant energy-saving mode is operated, cavity 94 is filled with refrigerant liquid, so that the impeller 99 of liquid pump 95 is always filled with liquid. This can ensure the operating stability and reliability of liquid pump 95, because once gaseous refrigerant appears in the impeller 99 cavity, liquid pump 95 will lose its function. The no-load operation of liquid pump 95 will cause the motor to heat up, and the motor will fail after long-term operation; if cavitation occurs, the impeller 99 of liquid pump 95 will be damaged prematurely.

[0039] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the refrigeration system further includes a first pipeline 200 and a first one-way valve 10. One end of the first pipeline 200 is in communication with the second outlet 92, and the other end of the first pipeline 200 is in communication with the inlet of the evaporator assembly 14; the first one-way valve 10 is arranged on the cooling circuit 100 and is located between the refrigerant inlet 93 and the connection node B between the first pipeline 200 and the cooling circuit 100. The first one-way valve 10 is used to prevent the refrigerant from flowing back to the refrigerant inlet 93. When the refrigeration system is in the state of pumping refrigerant energy saving, the refrigerant flowing out of the outlet of the condenser assembly 6 flows into the evaporator assembly 14 through the first pipeline 200.

[0040] Through the above-mentioned setting, the first pipeline 200 can realize the function of integrating two refrigeration modes into the same circulation loop; the first one-way valve 10 can prevent the refrigerant flowing out from the second outlet 92 of the liquid pump cooling component 9 from flowing back to the first outlet 91 through the pipeline where the first one-way valve 10 is located when the refrigeration system is in the pumping refrigerant energy-saving mode. In this way, the refrigerant can be prevented from flowing back to the liquid pump cooling component 9 and causing the entire refrigeration cycle to be interrupted, thereby ensuring that the refrigerant in the cooling circuit 100 flows in an orderly manner, thereby achieving the best refrigeration effect.

[0041] In the above technical solution, by setting the first pipeline 200, the refrigerant can flow directly from the outlet of the condenser assembly 6 through the first pipeline 200 into the evaporator assembly 14. At this time, the refrigeration system is in the direct expansion refrigeration mode; the first one-way valve 10 can only allow the refrigerant to flow from the first outlet 91 of the liquid pump cooling assembly 9 to the inlet of the evaporator assembly 14, which can avoid the reverse flow of the refrigerant.

[0042] like Figure 1 As shown, in an embodiment of the present invention, the refrigeration system further includes a second pipeline 300 and a second one-way valve 3. The second pipeline 300 is arranged in parallel with the compressor 1, one end of the second pipeline 300 is connected to the outlet of the evaporator assembly 14, and the other end of the second pipeline 300 is connected to the inlet of the condenser assembly 6; the second one-way valve 3 is arranged on the second pipeline 300.

[0043] Through the above-mentioned setting, by setting the second pipeline 300, the refrigerant flowing out from the outlet of the evaporator assembly 14 can flow directly into the condenser assembly 6 through the second pipeline 300 without passing through the compressor 1. In this way, the second pipeline 300 set in parallel with the compressor 1 can ensure that the refrigerant has different flow paths in the cooling circuit 100, thereby realizing the refrigerant flowing into the cooling circuit 100 after being compressed by the compressor 1 and the refrigerant bypassing the compressor 1 and flowing into the cooling circuit 100 from the second pipeline 300, so that the refrigeration system has a direct expansion refrigeration mode and a pumping refrigerant energy-saving mode, thereby realizing the function of integrating the two refrigeration modes into the same circulation loop; in addition, when the refrigeration system is in the pumping refrigerant energy-saving mode, the second one-way valve 3 can prevent the refrigerant from flowing back from the condenser assembly 6 to the evaporator assembly 14, thereby ensuring the smooth implementation of natural cooling refrigeration in the pumping refrigerant energy-saving mode.

[0044] like Figure 1 As shown, in an embodiment of the present invention, the refrigeration system further comprises a solenoid valve 2 arranged on the cooling circuit 100 , and the solenoid valve 2 is located between a connection node A between the second pipeline 300 and the cooling circuit 100 and an inlet of the compressor 1 .

[0045] Through the above settings, by controlling the opening and closing of the solenoid valve 2, it can be ensured that the refrigerant can flow along the correct path in different modes, avoiding affecting the normal operation of the refrigeration cycle, thereby achieving the best refrigeration effect; at the same time, the refrigeration system can also be switched between the two modes according to actual needs.

[0046] In the above technical solution, when the refrigeration system is in the direct expansion refrigeration mode, the solenoid valve 2 is controlled to be in an open state through the control component 22, so as to ensure that the refrigerant flowing out from the outlet of the evaporator component 14 can be completely sucked into the compressor 1 and will not flow into the second pipeline 300; when the refrigeration system is in the pumping refrigerant energy-saving mode, the solenoid valve 2 is controlled to be in a closed state through the control component 22, so as to ensure that the refrigerant flowing out from the outlet of the evaporator component 14 can be completely directly flowed into the condenser component 6 through the second pipeline 300 and will not be sucked into the compressor 1.

[0047] like Figure 1 As shown, in an embodiment of the present invention, the refrigeration system further comprises a third one-way valve 4 arranged on the cooling circuit 100 , and the third one-way valve 4 is located between the connection node B between the second pipeline 300 and the cooling circuit 100 and the outlet of the compressor 1 .

[0048] Through the above arrangement, the third one-way valve 4 can prevent the refrigerant from flowing back from the second pipeline 300 to the outlet of the compressor 1, thereby ensuring smooth natural cooling and refrigeration in the pumped refrigerant energy-saving mode.

[0049] like Figures 1 to 3 As shown, in the embodiment of the present invention, the condenser assembly 6 includes a condenser body 17, an air collecting pipe 18 and a liquid collecting pipe 19. The condenser body 17 has a condensation inlet and a condensation outlet; the air collecting pipe 18 is connected to the condensation inlet, and the air collecting pipe 18 is connected to the outlet of the compressor 1; the liquid collecting pipe 19 is connected to the condensation outlet, and the liquid collecting pipe 19 is connected to the refrigerant inlet 93, wherein the diameter of the liquid collecting pipe 19 is greater than the diameter of the air collecting pipe 18.

[0050] Through the above-mentioned arrangement, since the diameter of the collecting pipe 19 is relatively large, the collecting pipe 19 also has a certain liquid storage function. When both the collecting pipe 19 and the cavity 94 of the liquid pump cooling assembly 9 have liquid storage functions, the refrigerant capacity of the refrigeration system can be increased, and the amount of refrigerant in another operating mode can be effectively balanced. In addition, the refrigeration system does not need to additionally set up a separate liquid storage tank, which can reduce the amount of refrigerant in the refrigeration system, thereby achieving the function of reducing energy consumption and reducing costs.

[0051] In the above technical solution, the refrigerant gas discharged from the outlet of the compressor 1 flows into the condensation inlet through the cooling circuit 100, and enters the gas collecting pipe 18 from the condensation inlet. The gaseous refrigerant can be condensed into refrigerant liquid in the condenser assembly 6. The condensed refrigerant liquid can be stored in the collecting pipe 19 and discharged from the condensation outlet of the condenser assembly 6. Since the collecting pipe 19 is connected to the refrigerant inlet 93, the discharged refrigerant liquid can be transported to the liquid pump cooling assembly 9.

[0052] like Figures 1 to 3As shown, in an embodiment of the present invention, the condenser body 17 is V-shaped, the condenser assembly 6 also includes a condensing fan 7 arranged above the condenser body 17, the condenser assembly 6 includes a first branch pipe 20 and a second branch pipe 21, the gas collecting pipe 18 is connected to the outlet of the compressor 1 through the first branch pipe 20, and the liquid collecting pipe 19 is connected to the refrigerant inlet 93 through the second branch pipe 21.

[0053] In the above technical scheme, the condensing fan 7 can accelerate the heat exchange effect of the refrigerant in the condenser body 17; in addition, through the first branch pipe 20 and the second branch pipe 21, the gas collecting pipe 18 of the condenser assembly 6 can be connected to the outlet of the compressor 1, and the liquid collecting pipe 19 can be connected to the refrigerant inlet 93. This arrangement facilitates the gas refrigerant flowing out of the compressor 1 to flow to the condenser assembly 6, and the liquid refrigerant condensed by the condenser assembly 6 to flow to the liquid pump cooling assembly 9.

[0054] like Figure 1 As shown, in the embodiment of the present invention, the refrigeration system further includes an expansion valve 13 and a first temperature sensor 12. The expansion valve 13 is arranged between the evaporator assembly 14 and the liquid pump cooling assembly 9; along the flow direction of the refrigerant in the cooling circuit 100, the first temperature sensor 12 is located upstream of the expansion valve 13 to detect the temperature of the refrigerant entering the evaporator assembly 14.

[0055] Through the above-mentioned settings, the function of real-time monitoring of the temperature of the refrigerant entering the evaporator component 14 can be realized; in addition, by setting the expansion valve 13, the refrigerant flow entering the evaporator component 14 can be controlled, and at the same time, throttling and pressure reduction effects can be played, thereby protecting the evaporator component 14 from damage caused by high-pressure, low-temperature or overheated refrigerant.

[0056] In the above technical scheme, the first temperature sensor 12 is used to detect the temperature of the refrigerant entering the evaporator assembly 14, and control the speed of the condensing fan 7 according to the detected temperature; because when the refrigerant flowing into the evaporator assembly 14 is lower than 0°, the evaporator assembly 14 will frost, which will not only lead to a decrease in the cooling capacity and thus affect the cooling effect, but also may cause damage to the indoor air supply fan if ice cubes fall. Therefore, when the temperature measured by the first temperature sensor 12 is lower than 0°, it is necessary to reduce the speed of the condensing fan 7 to reduce the heat dissipation of the refrigerant in the condenser assembly 6, so as to avoid the refrigerant below 0° from entering the evaporator assembly 14, thereby ensuring the normal operation of the refrigeration system.

[0057] like Figure 1As shown, in the embodiment of the present invention, the refrigeration system further includes a second temperature sensor 5 and a third temperature sensor 16. The second temperature sensor 5 and the third temperature sensor 16 are both connected to the control component 22. The control component 22 controls the start and stop of the compressor 1 and the liquid pump 95 according to the signals transmitted by the second temperature sensor 5 and the third temperature sensor 16. The second temperature sensor 5 is located on the peripheral side of the condenser component 6 to monitor the outdoor temperature; the third temperature sensor 16 is located on the peripheral side of the evaporator component 14 to monitor the indoor temperature.

[0058] Through the above settings, the control component 22 can control the refrigeration system to be in different operating modes according to the above measurement data; at the same time, such a setting can also monitor the environment where the refrigeration system is located in real time to ensure the normal operation of the refrigeration system. Of course, according to actual conditions, the third temperature sensor 16 can also be replaced by a temperature and humidity sensor.

[0059] like Figure 1 As shown, in the embodiment of the present invention, the refrigeration system further includes a first pressure sensor 8 and a second pressure sensor 11 .

[0060] In the above technical solution, the first pressure sensor 8 is located between the condenser assembly 6 and the refrigerant inlet 93 of the liquid pump cooling assembly 9, and is used to detect the pressure value of the refrigerant at the refrigerant inlet 93; the second pressure sensor 11 is arranged on the cooling circuit 100 and is located between the connection node C between the cooling circuit 100 and the first pipeline 200 and the expansion valve 13, and is used to detect the pressure value of the refrigerant at the first outlet 91 or the second outlet 92.

[0061] By monitoring the relationship between the pressure value of the second outlet 92 and the pressure value of the refrigerant inlet 93, it is possible to ensure that the refrigeration system operates normally to achieve the best refrigeration effect.

[0062] Combine the following Figure 1 The flow path of the refrigerant in the two modes of the refrigeration system is described in detail:

[0063] When the outdoor temperature is high, the refrigeration system is in direct expansion refrigeration mode, the compressor 1 is started, and the liquid pump cooling assembly 9 is not started. At this time, the solenoid valve 2 at the air intake of the compressor 1 is opened, the compressor 1 inhales low-pressure refrigerant gas and discharges superheated high-pressure gaseous refrigerant; the gaseous refrigerant discharged from the compressor 1 passes through the third one-way valve 4 and dissipates heat in the condenser assembly 6, and the gaseous refrigerant is condensed into a high-pressure saturated liquid refrigerant in the condenser assembly 6; the liquid refrigerant flows into the refrigerant inlet 93 of the liquid pump cooling assembly 9 through the second branch pipe 21 of the condenser assembly 6. Since the refrigerant inlet 93 and the first outlet 91 of the liquid pump cooling assembly 9 are directly connected from the inside, the refrigerant can flow out directly from the first outlet 91 of the liquid pump cooling assembly 9; the outflowing refrigerant passes through the first one-way valve 10 and is throttled by the expansion valve 13 to become a low-temperature and low-pressure gas-liquid mixed refrigerant; the refrigerant then absorbs heat and evaporates through the evaporator assembly 14, taking away the heat from the indoor environment. After absorbing heat and evaporating, the refrigerant becomes a low-temperature and low-pressure gaseous refrigerant and returns to the compressor 1 through the solenoid valve 2; in this way, the cycle of the direct expansion refrigeration mode can be completed, and the operation is repeated.

[0064] When the outdoor temperature is low and meets the natural cooling requirements, the refrigeration system is in the energy-saving mode of pumping refrigerant, the compressor 1 stops running, the solenoid valve 2 at the air intake of the compressor 1 is closed, and the liquid pump cooling assembly 9 starts running. The low-temperature and low-pressure liquid refrigerant flowing out of the condenser assembly 6 enters through the refrigerant inlet 93 of the liquid pump cooling assembly 9, and the impeller 99 of the liquid pump 95 rotates, sucking saturated liquid refrigerant from the inner inlet 96, and after being pressurized, it reaches the second outlet 92 and flows out from the inner outlet 97 and the internal outlet pipe. The outflowing refrigerant is pressurized by the liquid pump cooling assembly 9 and changes from saturated low-temperature liquid to supercooled liquid. Since part of the refrigerant passes through the motor above the impeller 99 of the liquid pump 95, it takes away the heat generated by the motor, which can ensure the normal operation of the motor. After the refrigerant with a higher pressure flows out from the second outlet 92 of the liquid pump cooling assembly 9, since the pressure value of the second outlet 92 is higher than the pressure value of the refrigerant inlet 93, the refrigerant will close the valve when it flows through the first one-way valve 10, thereby preventing the refrigerant from flowing back; the refrigerant flowing out of the liquid pump cooling assembly 9 flows into the evaporator assembly 14 through the first temperature sensor 12 and the expansion valve 13, and absorbs heat and evaporates in the evaporator assembly 14 to become a low-temperature and low-pressure gaseous refrigerant; since the solenoid valve 2 at the suction port of the compressor 1 is closed, the gaseous refrigerant can bypass the compressor 1, pass through the second one-way valve 3 and return to the condenser assembly 6, and then flow from the condenser assembly 6 to the refrigerant inlet 93 of the liquid pump cooling assembly 9, thereby completing the cycle of the energy-saving mode of pumping refrigerant, and repeating this process. The refrigerant condenses in the condenser assembly 6 and evaporates in the evaporator assembly 14 without passing through the compressor 1, so that the outdoor natural cold source can be fully utilized to cool the indoor equipment, while greatly reducing the refrigeration energy consumption in a low-temperature environment.

[0065] like Figure 4 and Figure 5 As shown, the present invention further provides a control method for a refrigeration system, and the control method controls the above refrigeration system through a control component 22 .

[0066] In an embodiment of the present invention, the control method includes:

[0067] Controlling the refrigeration system to be in an energy-saving refrigeration step of pumping refrigerant energy-saving mode;

[0068] Control the refrigeration system to be in the compression refrigeration step of the direct expansion refrigeration mode.

[0069] Through the above settings, the function of switching between the two cooling modes can be realized according to actual needs to control the refrigeration system in different cooling steps. For example, in summer, when the outdoor temperature is high, the temperature in the machine room cannot be controlled by relying solely on indoor and outdoor heat exchange. It is necessary to start the compressor 1 and the solenoid valve 2. At this time, the refrigeration system can be controlled in the direct expansion refrigeration mode; when the outdoor temperature is low and can meet the natural cooling requirements, in order to save energy, the compressor 1 and the solenoid valve 2 can be turned off, and the liquid pump 95 can be turned on. The liquid pump 95 is used to realize the natural heat exchange of the refrigerant, and the refrigeration system is controlled to be in the pumping refrigerant energy-saving mode.

[0070] like Figure 3 and Figure 5 As shown, in an embodiment of the present invention, the condenser assembly 6 includes a condenser body 17 and a condensing fan 7 located on one side of the condenser body 17. After the energy-saving refrigeration step, the control method further includes:

[0071] Determine the pressure value of the second outlet 92 and the pressure value of the refrigerant inlet 93; determine whether the pressure value of the second outlet 92 of the liquid pump cooling assembly 9 is greater than the pressure value of the refrigerant inlet 93, and if so, execute the step of adjusting the speed of the condensing fan 7 or the liquid pump 95; if not, execute the abnormality handling step.

[0072] Through the above arrangement, by monitoring the magnitude relationship between the pressure value of the second outlet 92 and the pressure value of the refrigerant inlet 93 and executing corresponding processing steps, it is possible to ensure that the refrigeration system operates normally to achieve the best refrigeration effect.

[0073] Specifically, when the pressure value of the second outlet 92 of the liquid pump cooling component 9 is greater than the pressure value of the refrigerant inlet 93, it means that the liquid pump 95 is operating normally. At this time, it is only necessary to adjust the speed of the condensing fan 7 or the liquid pump 95 according to the refrigeration demand; when the pressure value of the second outlet 92 of the liquid pump cooling component 9 minus the pressure value of the refrigerant inlet 93 is less than the deviation value, it means that the liquid pump 95 has an abnormality and it is necessary to execute abnormal handling steps (such as restarting the liquid pump 95, etc.), so as to ensure the normal operation of the refrigeration system.

[0074] In an embodiment of the present invention, after the energy-saving refrigeration step, the control method also includes: a detection step of detecting the temperature of the refrigerant entering the evaporator assembly 14; a temperature judgment step of judging whether the temperature of the refrigerant is less than zero degrees, and if so, executing the step of adjusting the speed of the condensing fan 7 of the condenser assembly 6; if not, repeating the temperature judgment step.

[0075] Through the above-mentioned arrangement, the refrigerant below 0° can be prevented from entering the evaporator assembly 14, thus avoiding the reduction of cooling capacity caused by frosting of the evaporator assembly 14 and the damage to the blower caused by falling ice cubes, thereby ensuring the normal operation of the refrigeration system and ensuring that the refrigeration system has a stable refrigeration effect.

[0076] In an embodiment of the present invention, in the compression refrigeration step, the control method further includes a regulating step of regulating the rotation speed of the compressor 1 .

[0077] Through the above settings, adjusting the speed of the compressor 1 can control the flow rate of the refrigerant in the cooling circuit 100, and at the same time, the temperature and pressure of the refrigerant flowing out of the compressor 1 can be adjusted, which can ensure the normal operation of the refrigeration system and achieve a better refrigeration effect.

[0078] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0079] The evaporator assembly is used to evaporate the incoming liquid refrigerant into a gaseous refrigerant, and to flow out a low-temperature and low-pressure refrigerant gas; the condenser assembly can play a role in heat dissipation, condensing the gaseous refrigerant into a liquid refrigerant; the compressor is used to compress the incoming low-pressure refrigerant gas into an overheated high-pressure refrigerant gas, and the compressor can drive the refrigerant to circulate in the cooling circuit. The first pipeline and the second pipeline can transport the refrigerant when the refrigeration system is in the pumping refrigerant energy-saving mode. The first one-way valve, the second one-way valve and the third one-way valve can control the flow direction of the refrigerant to prevent the refrigerant in the pipeline from flowing back; the solenoid valve can control the opening and closing of the compressor suction port, thereby ensuring the normal flow direction of the refrigerant in the refrigeration system; the expansion valve can control the flow of the refrigerant entering the evaporator assembly, and the first temperature sensor can monitor and feedback the temperature of the refrigerant entering the evaporator assembly, so as to protect the normal operation of the evaporator assembly; the second temperature sensor and the third temperature sensor can monitor the indoor and outdoor temperature and humidity of the environment where the refrigeration system is located, so as to control the refrigeration system in different refrigeration modes through the control assembly. The cavity with liquid storage function and the liquid pump are used as a modular structure, and there is no need to set up a separate liquid storage tank. After this arrangement, the liquid pump cooling component is small in size and compact in structure. This arrangement can also reduce the amount of refrigerant charged in the refrigeration system, thereby achieving the function of reducing energy consumption and reducing costs; at the same time, since the above-mentioned liquid pump cooling component is equipped with an inlet and two outlets (a first outlet and a second outlet), the refrigerant can be transported to different pipelines through the two outlets, and the refrigeration system can have a direct expansion refrigeration mode and a pumping refrigerant energy-saving mode, thereby realizing the function of integrating the two refrigeration modes in the same cooling circuit; in addition, through the control component connected to the compressor and the liquid pump, the switching of the above-mentioned two refrigeration modes can also be realized according to needs.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A refrigeration system, characterized in that: The refrigeration system comprises a cooling circuit (100) and a compressor (1), an evaporator assembly (14) and a condenser assembly (6) which are sequentially arranged on the cooling circuit (100), and the refrigeration system further comprises: A liquid pump cooling assembly (9) is arranged on the cooling circuit (100) and located between the condenser assembly (6) and the evaporator assembly (14), the liquid pump cooling assembly (9) comprising a housing (90) and a liquid pump (95) arranged in the housing (90), the housing (90) defining a cavity (94) having a liquid storage function, a refrigerant inlet (93) communicating with the cavity (94), a first outlet (91) communicating with the cavity (94), and a second outlet (92) communicating with the liquid pump (95), the outlet of the condenser assembly (6) communicating with the refrigerant inlet (93), and the first outlet (91) and the second outlet (92) both communicating with the inlet of the evaporator assembly (14); A control component (22), the compressor (1) and the liquid pump (95) are respectively connected to the control component (22), so that the refrigeration system has a direct expansion refrigeration mode and a pumping refrigerant energy-saving mode; In the direct expansion refrigeration mode, the compressor (1) is in an open state and compresses the refrigerant in the vapor phase, the liquid pump (95) is in a closed state, and the refrigerant flowing out of the outlet of the condenser assembly (6) enters the evaporator assembly (14) through the refrigerant inlet (93) and the first outlet (91) in sequence, so that the refrigerant circulates in the cooling circuit (100) through the compressor (1); In the refrigerant pumping energy-saving mode, the liquid pump (95) is in an on state and pumps the refrigerant in a liquid state, the compressor (1) is in an off state, and under the action of the liquid pump (95), the refrigerant flowing out of the outlet of the condenser assembly (6) flows out from the second outlet (92) and enters the evaporator assembly (14); In the vertical direction, the height dimension of the first outlet (91) is smaller than the height dimension of the second outlet (92), and the refrigerant inlet (93) is located between the first outlet (91) and the second outlet (92), the liquid pump (95) is located below the cavity (94), and the inner cavity of the liquid pump (95) is in communication with the cavity (94); The refrigeration system further comprises a first pipeline (200), one end of the first pipeline (200) being in communication with the second outlet (92), and the other end of the first pipeline (200) being in communication with the inlet of the evaporator assembly (14); A first one-way valve (10) is provided on the cooling circuit (100) and is located between the refrigerant inlet (93) and a connection node between the first pipeline (200) and the cooling circuit (100). The first one-way valve (10) is used to prevent the refrigerant from flowing back to the refrigerant inlet (93). When the refrigeration system is in the pumping refrigerant energy-saving mode, the refrigerant flowing out of the outlet of the condenser assembly (6) flows into the evaporator assembly (14) through the first pipeline (200). The condenser assembly (6) comprises: a condenser body (17) having a condensation inlet and a condensation outlet; an air collecting pipe (18) connected to the condensation inlet, the air collecting pipe (18) being connected to the outlet of the compressor (1); a liquid collecting pipe (19) connected to the condensation outlet, the liquid collecting pipe (19) being connected to the refrigerant inlet (93), wherein the diameter of the liquid collecting pipe (19) is larger than the diameter of the air collecting pipe (18).

2. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises: a second pipeline (300) arranged in parallel with the compressor (1), one end of the second pipeline (300) being connected to the outlet of the evaporator assembly (14), and the other end of the second pipeline (300) being connected to the inlet of the condenser assembly (6); The second one-way valve (3) is arranged on the second pipeline (300).

3. The refrigeration system according to claim 2, characterized in that: The refrigeration system further comprises a solenoid valve (2) arranged on the cooling circuit (100), wherein the solenoid valve (2) is located between a connection node between the second pipeline (300) and the cooling circuit (100) and an inlet of the compressor (1).

4. The refrigeration system according to claim 1, characterized in that: The condenser body (17) is V-shaped, and the condenser assembly (6) also includes a condensing fan (7) arranged above the condenser body (17). The condenser assembly (6) includes a first branch pipe (20) and a second branch pipe (21). The gas collecting pipe (18) is connected to the outlet of the compressor (1) through the first branch pipe (20), and the liquid collecting pipe (19) is connected to the refrigerant inlet through the second branch pipe (21).

5. The refrigeration system according to any one of claims 1 to 3, characterized in that: The refrigeration system further comprises: an expansion valve (13) disposed between the evaporator assembly and the liquid pump cooling assembly (9); A first temperature sensor (12) is located upstream of the expansion valve (13) along the flow direction of the refrigerant in the cooling circuit (100) to detect the temperature of the refrigerant entering the evaporator assembly.

6. A control method for a refrigeration system, characterized in that: The control method is controlled by using the refrigeration system according to any one of claims 1 to 5, and the control method comprises: Controlling the refrigeration system to be in the energy-saving refrigeration step of the pumped refrigerant energy-saving mode; The refrigeration system is controlled to be in a compression refrigeration step of a direct expansion refrigeration mode.

7. The control method according to claim 6, characterized in that: The condenser assembly comprises a condenser body (17) and a condensing fan (7) located on one side of the condenser body (17). After the energy-saving refrigeration step, the control method further comprises: Determining a pressure value of the second outlet (92) and a pressure value of the refrigerant inlet (93); A pressure value judgment step is performed to determine whether the pressure value of the second outlet (92) of the liquid pump cooling component is greater than the pressure value of the refrigerant inlet (93); if so, a step of adjusting the rotation speed of the condensing fan (7) or the liquid pump (95) is performed; if not, an abnormality handling step is performed.

8. The control method according to claim 6, characterized in that: After the energy-saving refrigeration step, the control method further includes: A detection step of detecting the temperature of the refrigerant entering the evaporator assembly (14); A temperature judging step is performed to judge whether the temperature of the refrigerant is less than zero degrees. If so, a step of adjusting the rotation speed of the condensing fan (7) of the condenser assembly (6) is performed; if not, the temperature judging step is repeated.

9. The control method according to claim 6, characterized in that: In the compression refrigeration step, the control method further comprises a regulating step of regulating the rotation speed of the compressor (1).

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