Refrigeration system, control method of refrigeration system, and refrigeration apparatus

Abstract

This application discloses a refrigeration system, a control method for the refrigeration system, and refrigeration equipment, belonging to the field of refrigeration. The refrigeration system includes: a compressor, a condenser assembly, a heat exchanger, a return gas pipe assembly, and an evaporator assembly; the heat exchanger includes a first heat exchange tube and a second heat exchange tube, and the outlet of the condenser assembly is connected to the inlet of the first heat exchange tube; the return gas pipe assembly includes a first capillary tube, a second capillary tube, and a return gas pipeline, the first and second capillary tubes are connected in parallel, and the outlet of the first heat exchange tube is connected to the inlet of at least one of the first and second capillary tubes; the outlet of at least one of the first and second capillary tubes is connected to the inlet of the evaporator assembly, the outlet of the evaporator assembly is connected to the inlet of the return gas pipeline, and the outlet of the return gas pipeline can selectively be connected to the inlet of the second heat exchange tube or the inlet of the compressor, with the outlet of the second heat exchange tube connected to the inlet of the compressor. The refrigeration system of this application can improve the cooling rate of refrigeration equipment while saving energy and reducing noise.

Description

Technical Field

[0001] This application belongs to the field of refrigeration technology, and in particular relates to a refrigeration system, a control method for the refrigeration system, and refrigeration equipment. Background Technology

[0002] As living standards improve, people's demand for refrigeration equipment is gradually increasing. However, existing refrigeration equipment cannot meet people's growing refrigeration needs and needs to be improved. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a refrigeration system, a control method for the refrigeration system, and a refrigeration device. The refrigeration device can have a first operating state and a second operating state, which can improve the speed of the refrigeration system, save energy and reduce noise, and adapt to different load conditions of refrigeration equipment.

[0004] In a first aspect, this application provides a refrigeration system, comprising:

[0005] compressor;

[0006] A condenser assembly, wherein the outlet of the compressor is connected to the inlet of the condenser assembly;

[0007] The heat exchanger includes a first heat exchange tube and a second heat exchange tube, and the outlet of the condenser assembly is connected to the inlet of the first heat exchange tube;

[0008] The return gas pipe assembly includes a first capillary tube, a second capillary tube, and a return gas pipeline. The first capillary tube and the second capillary tube are connected in parallel, and the outlet of the first heat exchange tube is connected to the inlet of at least one of the first capillary tube and the second capillary tube.

[0009] An evaporator assembly, wherein the outlet of at least one of the first capillary tube and the second capillary tube is connected to the inlet of the evaporator assembly, the outlet of the evaporator assembly is connected to the inlet of the return gas line, and the outlet of the return gas line may optionally be connected to the inlet of the second heat exchange tube or the inlet of the compressor, and the outlet of the second heat exchange tube is connected to the inlet of the compressor.

[0010] According to the refrigeration system of this application, the refrigeration system may include a first working state and a second working state. When the refrigeration system is under high load, the refrigeration system first operates in the first working state. After the refrigeration system reaches or approaches the preset temperature, the refrigeration system can switch to the second working state. The refrigeration system switches between the first working state and the second working state based on the load of the refrigeration equipment to improve the cooling rate of the refrigeration equipment, while saving energy and reducing noise.

[0011] According to one embodiment of this application, the first heat exchange tube is connected to the first capillary tube, and the first heat exchange tube is optionally connected to the second capillary tube, wherein the flow rate of the second capillary tube is greater than the flow rate of the first capillary tube.

[0012] According to one embodiment of this application, the refrigeration system further includes a first control valve located in the parallel branch where the second capillary tube is located.

[0013] According to one embodiment of this application, the evaporator group includes a first evaporator and a second evaporator connected in parallel, and at least one of the first capillary tube and the second capillary tube is connected to the inlet of the return gas line through at least one of the first evaporator and the second evaporator.

[0014] According to one embodiment of this application, the refrigeration system further includes a second control valve, which is disposed in the parallel branch where the second evaporator is located.

[0015] According to one embodiment of this application, the refrigeration system further includes a third control valve, which is a three-way valve. The three-way valve includes a first port and a third port, the first port being connected to the outlet of the second heat exchange tube, the second port being connected to the inlet of the compressor, and the third port being connected to the outlet of the evaporator assembly.

[0016] According to one embodiment of this application, a drying filter is provided between the outlet of the condenser assembly and the inlet of the first heat exchange tube.

[0017] According to one embodiment of this application, the condenser group includes a forced condenser and a built-in condenser connected in series, the inlet of the forced condenser being connected to the outlet of the compressor, and the outlet of the built-in condenser being connected to the inlet of the first heat exchange tube.

[0018] Secondly, this application provides a control method for a refrigeration system in any of the above embodiments, comprising:

[0019] The operating status of the refrigeration system is determined based on the load status of the refrigeration equipment;

[0020] When the refrigeration system is in its first operating state, the compressor, condenser group, first heat exchange tube, parallel first and second capillary tubes, evaporator group, and return gas pipeline of the refrigeration system are connected sequentially from beginning to end.

[0021] According to the control method of the refrigeration system of this application, the refrigeration system may include a first working state and a second working state. When the refrigeration system is under high load, the refrigeration system first operates in the first working state. After the refrigeration system reaches or approaches the preset temperature, the refrigeration system can switch to the second working state. The refrigeration system switches between the first working state and the second working state based on the load of the refrigeration equipment to improve the cooling rate of the refrigeration equipment, while saving energy and reducing noise.

[0022] According to one embodiment of this application, after determining the operating state of the refrigeration system based on the load state of the refrigeration equipment, the control method further includes:

[0023] When the refrigeration system is in a second operating state, the compressor, condenser group, first heat exchange tube, first capillary tube, first evaporator of the evaporator group, return gas pipeline, and second heat exchange tube of the refrigeration system are controlled in a second manner. In this application, a refrigeration device is provided, including the refrigeration system described in any of the above embodiments.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the structure of the refrigeration system provided in the embodiments of this application;

[0027] Figure 2 This is a schematic diagram of the refrigeration system provided in the embodiments of this application in the first working state;

[0028] Figure 3 This is a schematic diagram of the refrigeration system provided in the embodiment of this application in the second working state.

[0029] Figure label:

[0030] Compressor 1, forced condenser 21, built-in condenser 22, heat exchanger 3, first heat exchange tube 31, second heat exchange tube 32, return gas pipe assembly 4, first capillary tube 41, second capillary tube 42, return gas line 43, first evaporator 51, second evaporator 52, first control valve 6, second control valve 7, third control valve 8, first port 81, second port 82, third port 83, dryer filter 9. Detailed Implementation

[0031] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0032] The following is for reference. Figures 1-3 This application describes a refrigeration system, a control method for the refrigeration system, and a refrigeration device according to embodiments of the present application. The refrigeration system is used to refrigerate the storage space of the refrigeration device, and the control method for the refrigeration system is used to control the refrigeration system to provide different cooling rates for the refrigeration device.

[0033] It should be noted that the storage device in this embodiment can be understood as a refrigeration storage device in a broad sense, including but not limited to refrigerators, freezers, display cases, beverage cabinets, wine cabinets, refrigerated display cases, and refrigerated vending machines. The storage devices have diverse structural forms and a wide range of applications.

[0034] The storage equipment includes a box and a door. The box includes an outer shell, an inner liner, and an insulation layer located between the outer shell and the inner liner. The outer shell covers the inner liner and provides protection. The insulation layer can be a foam layer, which provides insulation and cushioning. The space between the outer shell and the inner liner forms a compartment for housing machines such as compressors and circuit breakers.

[0035] Refrigeration equipment includes high-load conditions and medium-low-load conditions. Correspondingly, the refrigeration system has a first working state and a second working state. Under the high-load condition, the refrigeration system operates in the first working state, and under the low-load condition, the refrigeration system operates in the second working state.

[0036] High-load operating conditions include: the refrigerator operating temperature is -18℃ or above, or the user puts in a large amount of food, or the door is opened frequently every day.

[0037] Low to medium load conditions include: refrigerator operating temperature of -18℃ or below, or storing a small amount of food, or opening the door less frequently per day.

[0038] like Figure 1 As shown, the refrigeration system in this embodiment includes: compressor 1, condenser group, heat exchanger 3, return gas pipe group 4 and evaporator group.

[0039] The outlet of compressor 1 is connected to the inlet of condenser assembly; heat exchanger 3 includes a first heat exchange tube 31 and a second heat exchange tube 32, and the outlet of condenser assembly is connected to the inlet of the first heat exchange tube 31; return gas assembly 4 includes a first capillary tube 41, a second capillary tube 42 and a return gas line 43, the first capillary tube 41 and the second capillary tube 42 are connected in parallel, the outlet of the first heat exchange tube 31 is connected to the inlet of at least one of the first capillary tube 41 and the second capillary tube 42; the outlet of at least one of the first capillary tube 41 and the second capillary tube 42 is connected to the inlet of evaporator assembly, the outlet of evaporator assembly is connected to the inlet of return gas line 43, and the outlet of return gas line 43 may selectively be connected to the inlet of the second heat exchange tube 32 or the inlet of compressor 1, and the outlet of the second heat exchange tube 32 is connected to the inlet of compressor 1.

[0040] The refrigerant in the refrigeration system can be a single refrigerant or a mixture of refrigerants.

[0041] For example, the high-boiling-point refrigerant in the mixed refrigerant can be any one of R600a, R600, R290, R1270, R1243zf, R1234yf, R1234ze, and R1150, and the low-boiling-point refrigerant can be one of R170, R1150, R23, or R14.

[0042] The first heat exchange tube 31 can exchange heat with the second heat exchange tube 32. The first heat exchange tube 31 is a high-temperature tube, and the second heat exchange tube 32 is a low-temperature tube. The return gas pipeline 43 can exchange heat with the first capillary tube 41 and the second capillary tube 42 respectively.

[0043] The first capillary tube 41 and the second capillary tube 42 are connected in parallel. The first capillary tube 41 and the second capillary tube 42 can participate in the refrigeration cycle at the same time to improve the refrigeration speed; or, at least one of the first capillary tube 41 and the second capillary tube 42 can participate in the refrigeration cycle to reduce refrigeration noise.

[0044] Both the first capillary tube 41 and the second capillary tube 42 are used for throttling and pressure reduction.

[0045] In some embodiments, a dryer filter 9 is provided between the outlet of the condenser assembly and the inlet of the first heat exchange tube 31. The dryer filter 9 is used to filter out moisture and impurities in the refrigerant entering the first heat exchange tube 31 of the heat exchanger 3.

[0046] The outlet of the first heat exchange tube 31 is connected to the inlet of at least one of the first capillary tube 41 and the second capillary tube 42.

[0047] For example, such as Figure 2 As shown, in the first operating state of the refrigeration system, the outlet of the first heat exchange tube 31 can be connected to the first capillary tube 41, or it can be connected to the second capillary tube 42; as Figure 3As shown, in the second operating state of the refrigeration system, the outlet of the first heat exchange tube 31 can be connected to the first capillary tube 41 and the second capillary tube 42.

[0048] In this embodiment, by setting the first capillary tube 41 and the second capillary tube 42 in parallel, the throttling and pressure reduction effect on the refrigerant can be improved, the cooling rate can be increased, and the refrigeration equipment can quickly reach the preset temperature.

[0049] The outlet of the return gas pipeline 43 can be selectively connected to the inlet of the second heat exchanger 32 or the inlet of the compressor 1.

[0050] For example, such as Figure 2 As shown, in the first working state of the refrigeration system, the outlet of the return gas pipeline 43 can be directly connected to the inlet of the compressor 1, and the second heat exchange tube 32 does not exchange heat with the first heat exchange tube 31, thereby reducing the refrigerant temperature at the inlet of the compressor 1.

[0051] For example, such as Figure 3 As shown, in the second working state of the refrigeration system, the outlet of the return gas pipeline 43 is connected to the inlet of the second heat exchange tube 32, and the outlet of the second heat exchange tube 32 is connected to the inlet of the compressor 1, thereby reducing pressure and noise.

[0052] The pressure reduction principle of the refrigeration system: Heat exchanger 3 is composed of a first heat exchange tube 31 and a second heat exchange tube 32. High-temperature, high-pressure gas-liquid two-phase refrigerant enters the inlet of the first heat exchange tube 31 after exiting the condenser assembly, flowing through the first heat exchange tube 31 and into the inlet of the first capillary tube 41 and / or the second capillary tube 42. The refrigerant entering the second heat exchange tube 32 is a low-temperature, low-pressure gas-liquid two-phase refrigerant. Due to the temperature difference between the first heat exchange tube 31 and the second heat exchange tube 32, heat exchange occurs, resulting in a decrease in the temperature of the refrigerant in the first heat exchange tube 31 and an increase in the temperature of the refrigerant in the second heat exchange tube 32. The temperature of the refrigerant entering the first heat exchange tube 31 is above ambient temperature, while the temperature of the refrigerant at the outlet of the first heat exchange tube 31 decreases significantly after heat exchange, ranging from +32°C to -10°C. Refrigerant pressure and temperature are positively correlated; the higher the temperature, the greater the pressure. Therefore, the discharge pressure of the refrigeration system of this application is significantly lower than that of a conventional single-stage compression refrigeration system.

[0053] When the refrigeration system is under high load, it first operates in the first working state. After the refrigeration system reaches or approaches the preset temperature, it can switch to the second working state. The refrigeration system switches between the first and second working states based on the load of the refrigeration equipment to achieve rapid cooling, energy saving and noise reduction.

[0054] Working principle of the refrigeration system: The refrigerant is compressed into a high-temperature, high-pressure refrigerant gas by the compressor 1; the refrigerant gas enters the condenser group and condenses into a two-phase refrigerant, which then enters the dryer filter 9 to filter out moisture and impurities; the two-phase refrigerant enters the first heat exchange tube 31 of the heat exchanger 3, where it exchanges heat with the second heat exchange tube 32 for further condensation; the refrigerant enters the first capillary tube 41 and / or the second capillary tube 42 in the return gas pipe group 4 for throttling and pressure reduction, and exchanges heat with the return gas pipe 43 in the return gas pipe group 4, further cooling the refrigerant; after heat exchange in the evaporator group, the refrigerant forms a two-phase refrigerant, and the evaporator outlet is a two-phase refrigerant. This two-phase refrigerant exchanges heat with the first capillary tube 41 and / or the second capillary tube 42 through the return gas pipe 43, thereby cooling the refrigerant in the first capillary tube 41 and / or the second capillary tube 42.

[0055] After cooling, the refrigerant can enter the second heat exchange tube 32 to exchange heat with the first heat exchange tube 31, causing the refrigerant in the high-temperature heat exchange tube to cool down and condense, while the outlet of the low-temperature heat exchange tube is in a gaseous state; the gaseous refrigerant returns to the compressor 1 to complete one cycle.

[0056] Alternatively, the cooled refrigerant can return directly to compressor 1 to complete one cycle.

[0057] According to the refrigeration system provided in the embodiments of this application, the refrigeration equipment can have a first working state and a second working state. When the refrigeration system is under high load, the refrigeration system first operates in the first working state. After the refrigeration system reaches or approaches the preset temperature, that is, after the refrigeration equipment is under medium or low load, the refrigeration system can switch to the second working state. The refrigeration system can switch between the first working state and the second working state based on the load of the refrigeration equipment to improve the cooling rate of the refrigeration equipment, while saving energy and reducing noise, and adapting to the load conditions of different refrigeration equipment.

[0058] In some embodiments, the first heat exchange tube 31 is connected to the first capillary tube 41, and the first heat exchange tube 31 is optionally connected to the second capillary tube 42, wherein the flow rate of the second capillary tube 42 is greater than the flow rate of the first capillary tube 41.

[0059] The second capillary tube 42 has a greater throttling and pressure reduction capacity than the first capillary tube 41. When the second capillary tube 42 participates in the refrigeration cycle, it can quickly achieve the purpose of cooling and noise reduction.

[0060] In the first working state, the first heat exchange tube 31 is connected to the second capillary tube 42, and in the second working state, the first heat exchange tube 31 and the second capillary tube 42 are not connected.

[0061] In some embodiments, the refrigeration system further includes a first control valve 6, which is located in the parallel branch where the second capillary tube 42 is located.

[0062] The first control valve 6 is used to control whether the second capillary tube 42 participates in the refrigeration cycle. When the first control valve 6 is open, the second capillary tube 42 participates in the refrigeration cycle. The refrigerant flowing out of the first heat exchange tube 31 flows into the first capillary tube 41 and the second capillary tube 42 respectively to increase the throttling and pressure reduction effect and improve the cooling rate.

[0063] The first control valve 6 can be a solenoid valve.

[0064] In some embodiments, the evaporator group includes a first evaporator 51 and a second evaporator 52 connected in parallel, and at least one of the first capillary tube 41 and the second capillary tube 42 is connected to the inlet of the return gas line 43 through at least one of the first evaporator 51 and the second evaporator 52.

[0065] Among them, such as Figure 2 As shown, in the first working state of the refrigeration system, the first capillary tube 41 and the second capillary tube 42 are connected to the inlet of the return gas pipeline 43 through the first evaporator 51 and the second evaporator 52. That is, both the first evaporator 51 and the second evaporator 52 participate in the refrigeration cycle. The dual evaporators can improve the refrigeration speed and reduce the refrigeration temperature, thereby improving the refrigeration capacity of the refrigeration system.

[0066] Among them, such as Figure 3 As shown, in the second working state of the refrigeration system, the first evaporator 51 or the second evaporator 52 participates in the refrigeration cycle, saving energy and reducing noise.

[0067] In the second operating state of the refrigeration system, the first capillary tube 41 or the second capillary tube 42 is connected to the inlet of the return gas pipeline 43 through the first evaporator 51 or the second evaporator 52.

[0068] For example, in the second operating state, the first capillary tube 41 is connected to the inlet of the return gas line 43 through the first evaporator 51; in the second operating state, the second capillary tube 42 is connected to the inlet of the return gas line 43 through the first evaporator 51; in the second operating state, the first capillary tube 41 is connected to the inlet of the return gas line 43 through the second evaporator 52; and the second capillary tube 42 is connected to the inlet of the return gas line 43 through the second evaporator 52.

[0069] In some embodiments, such as Figure 1 and Figure 2 As shown, the refrigeration system also includes a second control valve 7, which is located in the parallel branch where the second evaporator 52 is located. The first evaporator 51 participates in the refrigeration cycle, and the second evaporator 52 participates in the refrigeration cycle in the first working state of the refrigeration system.

[0070] The second control valve 7 is used to control whether the second evaporator 52 participates in the refrigeration cycle. When the second control valve 7 is open, the second evaporator 52 participates in the refrigeration cycle. The refrigerant flowing out from the return gas pipe group 4 flows into the first evaporator 51 and the second evaporator 52 respectively to increase the refrigeration capacity of the refrigeration system, increase the cooling rate, and reduce the refrigeration temperature.

[0071] The second control valve 7 can be a solenoid valve.

[0072] In related technologies, conventional single-stage compression refrigeration systems do not have a heat exchanger 3, and usually only have a return gas pipe assembly 4. For cryogenic cabinets, the steady-state pressure from the compressor outlet 11 to the capillary inlet of a conventional single-stage compression refrigeration system is 2.2 to 2.4 MPa. The steady-state pressure from the compressor outlet 11 to the capillary inlet of the refrigeration system of this application is ≤1.6 MPa, which is nearly one-third lower.

[0073] In conventional single-stage compression refrigeration systems, the refrigerant exits the condenser assembly and directly passes through a capillary tube for throttling and pressure reduction before entering the evaporator for heat exchange. However, in the refrigeration system provided in this application, the refrigerant first undergoes heat exchange at heat exchanger 3 after exiting the condenser assembly, losing some of its cooling capacity, before passing through the first capillary tube 41 for throttling and pressure reduction before entering the first evaporator 51 for heat exchange.

[0074] The refrigeration system of this application, by setting up a heat exchanger 3 and a return gas pipe group 4, allows the refrigerant discharged from the condenser group to exchange heat at the heat exchanger 3 when the refrigeration system is in the second working state. The refrigerant temperature is reduced, and then it enters the first evaporator 51 for further heat exchange through the throttling and pressure reduction effect of the first capillary tube 41 of the return gas pipe group 4. This improves the refrigeration effect, reduces the exhaust pressure of the refrigeration system in steady state, and reduces the noise of the whole machine.

[0075] In some embodiments, the refrigeration system further includes a third control valve 8, which is a three-way valve. The three-way valve includes a first port 81 connected to the outlet of the second heat exchange tube 32, a second port 82 connected to the inlet of the compressor 1, and a third port 83 connected to the outlet of the evaporator assembly.

[0076] Among them, such as Figure 2 As shown, in the first working state of the refrigeration system, the second port 82 and the third port 83 of the third control valve 8 are connected, that is, the third control valve 8 connects the outlet of the return gas pipeline 43 and the inlet of the compressor 1; in the second working state of the refrigeration system, the first port 81 and the third port 83 of the third control valve 8 are connected, that is, the outlet of the return gas pipeline 43 and the inlet of the second heat exchange tube 32.

[0077] In the first working state of the refrigeration system, both the first evaporator 51 and the second evaporator 52 participate in the refrigeration cycle. The dual evaporators can improve the refrigeration speed and reduce the refrigeration temperature, thereby improving the refrigeration capacity of the refrigeration system.

[0078] Among them, such as Figure 3 As shown, in the second working state of the refrigeration system, the first evaporator 51 or the second evaporator 52 participates in the refrigeration cycle, saving energy and reducing noise.

[0079] In some embodiments, the condenser assembly includes a forced condenser 21 and a built-in condenser 22 connected in series. The inlet of the forced condenser 21 is connected to the outlet of the compressor 1, and the outlet of the built-in condenser 22 is connected to the inlet of the first heat exchange tube 31.

[0080] The forced condenser 21 can be an air-cooled condenser or a water-cooled condenser. The forced condenser 21 can dissipate heat quickly through forced convection and initially condense the refrigerant into a gas-liquid mixture.

[0081] Air-cooled condensers can be forced to circulate air using a fan, while water-cooled condensers can be forced to circulate air using a water pump.

[0082] The built-in condenser 22 can be a shell-and-tube condenser or a plate condenser. The built-in condenser 22 can receive the refrigerant after it has been initially cooled by the forced condenser 21 and further condense the refrigerant to a near-liquid state.

[0083] In this embodiment, by setting up dual condensers, the forced condenser 21 and the built-in condenser 22 optimize heat dissipation efficiency through division of labor and cooperation, while improving the compactness and heat recovery potential of the refrigeration system, which is suitable for scenarios with high requirements for energy efficiency or thermal management.

[0084] This application also provides a control method for a refrigeration system in any of the above embodiments, including: step 100 and step 200.

[0085] Step 100: Determine the operating status of the refrigeration system based on the load status of the refrigeration equipment.

[0086] The load conditions of refrigeration equipment include high load conditions and medium-low load conditions.

[0087] High-load operating conditions include: initial power-on of the refrigeration equipment and setting to quick-freeze mode, refrigerator operating temperature of -18℃ or above, or when the user puts in a large amount of food, or when the door is opened frequently every day.

[0088] Low to medium load conditions include: the refrigeration equipment continues to run until the set temperature or a stable state, the refrigerator's operating temperature is -18℃ or below, or a small amount of food is stored, or the door is opened less frequently each day.

[0089] The load status of refrigeration equipment can be determined by the equipment's own sensors, such as temperature sensors.

[0090] The operating states of the refrigeration system include a first operating state corresponding to the high load condition of the refrigeration equipment and a second operating state corresponding to the medium and low load condition of the refrigeration equipment.

[0091] Step 200: When the refrigeration system is in the first working state, control the compressor 1, condenser group, first heat exchange tube 31, parallel first capillary tube 41 and second capillary tube 42, evaporator group and return gas line 43 of the refrigeration system to be connected end to end in sequence.

[0092] like Figure 2 As shown, in the first working state, the controller controls the first control valve 6 and the second control valve 7 of the refrigeration system to open, and controls the second port 82 and the third port 83 of the third control valve 8 to connect.

[0093] The refrigeration system cycle in the first operating state is as follows:

[0094] like Figure 2 As shown, the refrigerant is compressed into a high-temperature, high-pressure refrigerant gas by compressor 1; the gaseous refrigerant sequentially enters the forced condenser 21 and the built-in condenser 22 to condense into a two-phase refrigerant, and then enters the dryer filter 9 to filter out moisture and impurities; the two-phase refrigerant enters the first heat exchange tube 31 of heat exchanger 3, and the first heat exchange tube 31 and the second heat exchange tube 32 exchange heat for further condensation; the refrigerant enters the first capillary tube 41 and the second capillary tube 42 in the return gas pipe group 4 for throttling and pressure reduction. The first capillary tube 41 and the second capillary tube 42 are connected in parallel. At this time, the first control valve 6 is opened, and the first capillary tube 41 and the second capillary tube 42 exchange heat with the return gas pipe 43 in the return gas pipe group 4, respectively, so that the refrigerant is further cooled; refrigeration. After the refrigerant enters the first evaporator 51 and the second evaporator 52 for heat exchange, it forms a gas-liquid two-phase refrigerant. At this time, the second control valve 7 is opened, and the refrigerant at the outlet of the evaporator group is in a gas-liquid two-phase state. This gas-liquid two-phase refrigerant exchanges heat with the first capillary tube 41 and the second capillary tube 42 through the return gas pipeline 43, thereby cooling the refrigerant in the first capillary tube 41 and the second capillary tube 42. The refrigerant enters the first heat exchange tube 31 and the second heat exchange tube 32 for heat exchange, causing the refrigerant in the first heat exchange tube 31 to cool down and condense. The outlet of the second heat exchange tube 32 is in a gaseous state. At this time, the second port 82 and the third port 83 of the third control valve 8 are connected. The third control valve 8 connects the return gas pipeline 43 and the inlet of the compressor 1. The second heat exchange tube 32 in the heat exchanger 3 is not flowing.

[0095] According to the control method of the refrigeration system provided in the embodiments of this application, when the refrigeration system is under high load, the refrigeration system can be controlled to work in the first working state, which can make the refrigeration system cool down quickly, so that the refrigeration equipment can quickly reach the preset temperature and improve the cooling rate.

[0096] In some embodiments, after determining the operating state of the refrigeration system based on the load state of the refrigeration equipment in step 100, the refrigeration system further includes step 300.

[0097] Step 300: When the refrigeration system is in the second working state, control the compressor 1, condenser group, first heat exchange tube 31, first capillary tube 41, first evaporator 51 of evaporator group, return gas line 43, and second heat exchange tube 32 of the refrigeration system to be connected end to end in sequence.

[0098] like Figure 3 As shown, in the second working state, the controller controls the first control valve 6 and the second control valve 7 of the refrigeration system to close, and controls the first port 81 and the third port 83 of the third control valve 8 to connect.

[0099] like Figure 3 As shown, the refrigeration system cycle in the second operating state is as follows:

[0100] The refrigerant is compressed into a high-temperature, high-pressure refrigerant gas by compressor 1; the gaseous refrigerant sequentially enters the forced condenser 21 and the built-in condenser 22 to condense into a two-phase refrigerant, and then enters the dryer filter 9 to filter out moisture and impurities; the two-phase refrigerant enters the first heat exchange tube 31 of heat exchanger 3, and the first heat exchange tube 31 and the second heat exchange tube 32 exchange heat for further condensation; the refrigerant enters the first capillary tube 41 in the return gas pipe group 4 for throttling and pressure reduction, at which time the first control valve 6 is closed, and the first capillary tube 41 exchanges heat with the return gas pipe 43 in the return gas pipe group 4, further cooling the refrigerant; the refrigerant enters the first evaporator 5. After heat exchange, a two-phase refrigerant is formed. At this time, the second control valve 7 is closed, and the outlet of the evaporator group is in a two-phase state. This two-phase refrigerant exchanges heat with the first capillary tube 41 through the return gas pipeline 43, thereby cooling the refrigerant in the first capillary tube 41. The refrigerant enters the second heat exchange tube 32 and exchanges heat with the first heat exchange tube 31, causing the refrigerant in the first heat exchange tube 31 to cool down and condense. The outlet of the second heat exchange tube 32 is in a gaseous state. At this time, the first port 81 and the third port 83 of the third control valve 8 are connected, that is, the third control valve 8 connects the return gas pipeline 43 and the second heat exchange tube 32. The gaseous refrigerant returns to the compressor 1 to complete one cycle.

[0101] When the refrigeration equipment is detected to be in a low to medium load mode, the pressure reduction and noise reduction function of heat exchanger 3 begins to appear.

[0102] Its voltage reduction and noise reduction principle is as follows:

[0103] like Figure 3 As shown, heat exchanger 3 is composed of two copper tubes: a first heat exchange tube 31 and a second heat exchange tube 32. The first heat exchange tube 31 is a high-temperature heat exchange tube, and the second heat exchange tube 32 is a low-temperature heat exchange tube. The high-temperature, high-pressure gas-liquid two-phase refrigerant enters the inlet of the first heat exchange tube 31 after exiting the condenser assembly, and flows through the first heat exchange tube 31 into the inlet of the first capillary tube 41. The refrigerant entering the second heat exchange tube 32 is a low-temperature, low-pressure gas-liquid two-phase refrigerant. Due to the temperature difference between the two heat exchange tubes of heat exchanger 3, heat exchange occurs, and the temperature of the refrigerant in the first heat exchange tube 31 decreases, while the temperature of the refrigerant in the second heat exchange tube 32 increases. The temperature of the refrigerant entering the first heat exchange tube 31 is above the ambient temperature, while the temperature of the refrigerant at the outlet of the first heat exchange tube 31 decreases significantly after heat exchange. The pressure and temperature of the refrigerant are positively correlated; the lower the temperature, the lower the pressure. Consequently, the pressure at the high-pressure end of the compressor 1 discharge is lower, and the noise is reduced accordingly.

[0104] The following is an illustration of a complete embodiment of a refrigeration system control method:

[0105] When the refrigeration equipment is initially powered on and set to quick-freeze mode, that is, when the refrigeration equipment enters a high-load condition, the controller controls the refrigeration system to work in the first working state, that is, the controller controls the first control valve 6 and the second control valve 7 to open, and the third control valve 8 connects the second port 82 and the third port 83.

[0106] When the controller receives a signal from the refrigeration equipment sensor that the temperature has reached the first temperature threshold, i.e. the refrigeration equipment has entered a low-to-medium load condition, the controller controls the refrigeration system to operate in the second working state, i.e. the controller controls the first control valve 6 and the second control valve 7 to close, and at the same time controls the third control valve 8 to connect the first port 81 and the third port 83.

[0107] The refrigeration system continues to run. When the controller receives a sensor from the refrigeration equipment indicating that the temperature has reached the second temperature threshold, the controller will shut down the refrigeration system.

[0108] When the controller receives a sensor reading from the refrigeration equipment indicating that the temperature exceeds the third temperature threshold, the controller controls the refrigeration system to operate in the first working state, activating the rapid cooling mode.

[0109] The first temperature threshold is the critical temperature threshold for high-load and medium-low-load conditions of the refrigeration equipment, and the second temperature threshold is the critical temperature threshold for medium-low-load and ultra-low-load conditions of the refrigeration equipment.

[0110] Among them, the following conditions must be met: the second temperature threshold < the first temperature threshold < the third temperature threshold.

[0111] According to the control method for a refrigeration system provided in the embodiments of this application, the refrigeration system can include a first operating state and a second operating state. When the refrigeration system is under high load, it can be controlled to operate in the first operating state, enabling rapid cooling to quickly reach the preset temperature and increase the cooling rate. When the refrigeration system is under medium to low load, it can be controlled to operate in the second operating state, reducing the cooling rate, lowering voltage, and reducing noise. Therefore, when the refrigeration system is under high load, the controller can control the refrigeration system to initially operate in the first operating state. After the refrigeration system reaches or approaches the preset temperature, the controller can control the refrigeration system to switch to the second operating state. The controller controls the refrigeration system to switch between the first and second operating states based on the load condition of the refrigeration equipment, thereby increasing the cooling rate of the refrigeration equipment while saving energy and reducing noise.

[0112] This application also provides a refrigeration device, including the refrigeration system of any of the above embodiments.

[0113] According to the refrigeration equipment provided in the embodiments of this application, the refrigeration system may include a first operating state and a second operating state. When the refrigeration system is under high load, it can be controlled to operate in the first operating state, enabling rapid cooling to quickly reach the preset temperature and improve the cooling rate. When the refrigeration system is under medium to low load, it can be controlled to operate in the second operating state, reducing the cooling rate, lowering voltage, and reducing noise. Therefore, when the refrigeration system is under high load, the controller can control the refrigeration system to initially operate in the first operating state. After the refrigeration system reaches or approaches the preset temperature, the controller can control the refrigeration system to switch to the second operating state. The controller controls the refrigeration system to switch between the first and second operating states based on the load condition of the refrigeration equipment, thereby improving the cooling rate while saving energy and reducing noise.

[0114] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0115] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0116] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0117] In the description of this application, "multiple" means two or more.

[0118] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0119] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0120] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0121] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A refrigeration system, characterized in that, include: compressor; A condenser assembly, wherein the outlet of the compressor is connected to the inlet of the condenser assembly; The heat exchanger includes a first heat exchange tube and a second heat exchange tube, and the outlet of the condenser assembly is connected to the inlet of the first heat exchange tube; The return gas pipe assembly includes a first capillary tube, a second capillary tube, and a return gas pipeline. The first capillary tube and the second capillary tube are connected in parallel, and the outlet of the first heat exchange tube is connected to the inlet of at least one of the first capillary tube and the second capillary tube. An evaporator assembly, wherein the outlet of at least one of the first capillary tube and the second capillary tube is connected to the inlet of the evaporator assembly, the outlet of the evaporator assembly is connected to the inlet of the return gas line, and the outlet of the return gas line may optionally be connected to the inlet of the second heat exchange tube or the inlet of the compressor, and the outlet of the second heat exchange tube is connected to the inlet of the compressor.

2. The refrigeration system according to claim 1, characterized in that, The first heat exchange tube is connected to the first capillary tube, and the first heat exchange tube is optionally connected to the second capillary tube, wherein the flow rate of the second capillary tube is greater than the flow rate of the first capillary tube.

3. The refrigeration system according to claim 2, characterized in that, The refrigeration system also includes a first control valve, which is located in the parallel branch where the second capillary tube is located.

4. The refrigeration system according to claim 1, characterized in that, The evaporator assembly includes a first evaporator and a second evaporator connected in parallel, and at least one of the first capillary tube and the second capillary tube is connected to the inlet of the return gas line through at least one of the first evaporator and the second evaporator.

5. The refrigeration system according to claim 4, characterized in that, The refrigeration system also includes a second control valve, which is located in the parallel branch where the second evaporator is located.

6. The refrigeration system according to claim 1, characterized in that, The refrigeration system also includes a third control valve, which is a three-way valve. The three-way valve has a first port and a third port. The first port is connected to the outlet of the second heat exchange tube, the second port is connected to the inlet of the compressor, and the third port is connected to the outlet of the evaporator assembly.

7. The refrigeration system according to any one of claims 1-6, characterized in that, A drying filter is provided between the outlet of the condenser assembly and the inlet of the first heat exchange tube.

8. The refrigeration system according to any one of claims 1-6, characterized in that, The condenser assembly includes a forced condenser and a built-in condenser connected in series. The inlet of the forced condenser is connected to the outlet of the compressor, and the outlet of the built-in condenser is connected to the inlet of the first heat exchange tube.

9. A control method for a refrigeration system according to any one of claims 1-8, characterized in that, include: The operating status of the refrigeration system is determined based on the load status of the refrigeration equipment; When the refrigeration system is in its first operating state, the compressor, condenser group, first heat exchange tube, parallel first and second capillary tubes, evaporator group, and return gas pipeline of the refrigeration system are connected sequentially from beginning to end.

10. The control method for the refrigeration system according to claim 9, characterized in that, After determining the operating state of the refrigeration system based on the load state of the refrigeration equipment, the control method further includes: When the refrigeration system is in the second working state, the compressor, condenser group, first heat exchange tube, first capillary tube, first evaporator of the evaporator group, return gas pipeline, and second heat exchange tube of the refrigeration system are connected in sequence.

11. A refrigeration device, characterized in that, The refrigeration system included in any one of claims 1-8.

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