A refrigerator refrigeration system and a refrigerator using the refrigerator refrigeration system
By using a dual compressor system and an overflow liquid receiver, the refrigerator's refrigeration system achieves efficient and low-energy operation in the deep freezer compartment, meeting multiple temperature requirements and optimizing the refrigerator's energy consumption and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-05-05
- Publication Date
- 2026-03-13
AI Technical Summary
Existing refrigerator refrigeration systems are energy-intensive and inefficient when providing deep-freeze compartments, and cannot effectively meet multiple temperature requirements.
The system employs a dual-compressor system, combined with an overflow receiver and a solenoid reversing valve, to divert the refrigerant to two paths for evaporative cooling, matching the needs of different rooms, and optimizing energy consumption through the switching of fan and compressor states.
It improves refrigeration efficiency, reduces energy consumption, meets the refrigeration, freezing and deep freezing needs of multi-temperature compartments, reduces defrosting energy consumption, and improves the system's adaptability and safety.
Smart Images
Figure CN116659108B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a refrigerator refrigeration system and a refrigerator using the refrigerator refrigeration system. Background Technology
[0002] Existing refrigerator refrigeration systems generally include a compressor, condenser, dryer filter, and evaporator connected in series. The condenser is connected to the dryer filter, which is connected to the evaporator via a capillary tube. The evaporator is connected to the compressor via a return pipe. When the refrigerator is operating, the compressor starts and draws refrigerant vapor from the evaporator, allowing the new refrigerant to evaporate and absorb heat. The compressor compresses the gaseous refrigerant, turning it into high-pressure, high-temperature refrigerant vapor. The compressed superheated vapor enters the condenser (where it is blown by a condenser fan) and releases heat to the surrounding air, liquefying and cooling under the same pressure. The supercooled liquid refrigerant, under condensing pressure, flows through the dryer filter into the capillary tube. At the end of the capillary tube, the wet vapor pressure decreases, and the refrigerant (at this point, its boiling point is around -30°C) enters the evaporator to absorb heat and evaporate. This cycle repeats continuously. Furthermore, existing refrigerator refrigeration systems are designed with different reference temperatures for different storage compartments; for example, the reference temperature for the freezer compartment is often set at -18°C, and the reference temperature for the refrigerator compartment is often set at 5°C. If a storage room with a lower temperature requirement is needed, such as a deep-freeze room with a base temperature of -30°C, using the above-mentioned conventional refrigeration system would require increasing the internal volume and speed of the compressor to potentially provide a low temperature of -30°C to the deep-freeze room. However, this would require higher compressor costs and energy consumption. Furthermore, the evaporation pressure at -30°C is 0.36 bar, and the compressor suction pressure would also be very low, resulting in high energy consumption for the entire refrigeration system. Summary of the Invention
[0003] The first technical problem to be solved by the present invention is to provide a refrigeration system for refrigerators with high refrigeration efficiency, low energy consumption and applicable to deep-freezing compartments, in contrast to the above-mentioned prior art.
[0004] The second technical problem to be solved by the present invention is to provide a refrigerator with high refrigeration efficiency, low energy consumption and applicable to deep freezing compartments, in contrast to the above-mentioned prior art.
[0005] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: a refrigerator refrigeration system, characterized in that it includes a first compressor, a second compressor, a condenser, a condenser fan, an electromagnetic reversing valve, a return pipe, a first capillary tube, a second capillary tube, a third capillary tube, an overflow receiver, a first evaporator, a first evaporator fan, a second evaporator, a second evaporator fan, and a one-way check valve, wherein the condenser fan is disposed next to the condenser, the first evaporator fan is disposed next to the first evaporator, the second evaporator fan is disposed next to the second evaporator, the electromagnetic reversing valve has an input end, a first output end, and a second output end, and the input end is selectively connected to the first output end and the second output end; the overflow receiver has an input port, an output port, and an overflow port;
[0006] The output end of the second compressor is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the solenoid reversing valve, the first output end of the solenoid reversing valve is connected to the first capillary tube and then to the input port of the overflow receiver; the output port of the overflow receiver is connected to the third capillary tube and then to the input end of the second evaporator, the output end of the second evaporator is connected to the input end of the first compressor, and the output end of the first compressor is connected to the one-way check valve and then to the input end of the second compressor.
[0007] The second output end of the electromagnetic reversing valve is connected to the second capillary tube and then to the input end of the first evaporator. The output end of the first evaporator is connected to the return gas pipe and then to the input end of the second compressor.
[0008] The refrigerator refrigeration system described above contains refrigerant. When the input end of the electromagnetic reversing valve is connected to the first output end, the refrigerant condenses from the condenser and becomes a high-temperature liquid refrigerant. It then enters the overflow receiver through the first capillary tube. After flowing into the overflow receiver, the refrigerant splits into two paths. One path is a vapor-liquid mixture that overflows from the overflow port and enters the first evaporator for evaporative refrigeration. The other path is pure liquid refrigerant that flows out from the output port of the overflow receiver, enters the third capillary tube for throttling, and then enters the second evaporator for evaporative refrigeration. It then enters the first compressor for preliminary compression. The refrigerant flowing out of the first compressor mixes with the gaseous refrigerant flowing out of the first evaporator and the return pipe before entering the second compressor together. This cycle repeats continuously.
[0009] When the input end of the electromagnetic reversing valve is connected to the second output end, the refrigerant is condensed from the condenser and converted into a high-temperature liquid refrigerant. Then, it enters the first evaporator through the second capillary tube for evaporation and refrigeration, and then enters the second compressor through the return pipe. This cycle repeats continuously.
[0010] When the first evaporator needs defrosting, the second compressor and condenser fan stop running. After being compressed by the first compressor, the gaseous refrigerant enters the first evaporator through the return pipe. While dissipating heat and condensing in the first evaporator, it also defrosts the first evaporator. After condensation, the refrigerant enters the overflow receiver through the overflow port, and then flows out from the outlet of the overflow receiver into the third capillary tube for throttling. It then evaporates and absorbs heat in the second evaporator, and then enters the first compressor, and then enters the next cycle.
[0011] As an improvement, both the first capillary and the second capillary are connected to the return gas pipe by oxy-fuel welding or tin welding.
[0012] In a further improvement, the overflow reservoir includes a reservoir cylinder with its inlet located on the upper side wall or top of the reservoir cylinder, its outlet located at the bottom of the reservoir cylinder, and its overflow outlet located on the side wall of the reservoir cylinder, and positioned lower than the inlet.
[0013] The technical solution adopted by the present invention to solve the second technical problem mentioned above is as follows: a refrigerator, including a cabinet, in which a refrigerator compartment and a freezer compartment are formed, characterized in that: a deep freezer compartment is further formed in the cabinet, and the cabinet has a refrigeration system with the above structure, wherein the first evaporator is used to provide a cold source for the refrigerator compartment and the freezer compartment; and the second evaporator provides a cold source for the deep freezer compartment.
[0014] As an improvement, a refrigeration circulation duct communicating with the refrigeration compartment is formed in the cabinet at the rear of the freezer compartment. The first evaporator is located at the rear of the freezer compartment and communicates with the refrigeration circulation duct. A refrigeration circulation duct communicating with the refrigeration compartment is formed in the cabinet at the rear of the refrigerator compartment. The refrigeration circulation duct and the refrigeration circulation duct are connected, and a refrigeration air damper is provided at the connection point. A deep-freezing circulation duct communicating with the deep-freezing compartment is formed in the cabinet at the rear of the deep-freezing compartment. The second evaporator is located at the rear of the deep-freezing compartment and communicates with the deep-freezing circulation duct.
[0015] Further improvements are made to control the operating states of the refrigeration damper, the first evaporator fan, the second evaporator fan, the refrigeration fan, the first compressor, and the second compressor, as well as the connection status of the input terminal and the first and second output terminals of the electromagnetic reversing valve, and the operating request status of the refrigeration compartment, the freezer compartment, and the deep freezer compartment, through the following methods:
[0016] When the refrigerator compartment, freezer compartment, and deep freezer compartment all have operational requirements, the refrigerator damper opens, the input end of the solenoid reversing valve connects to the first output end, the first evaporator fan turns on, the second evaporator fan turns on, the condenser fan turns on, the first compressor turns on, and the second compressor turns on.
[0017] When the refrigerator and freezer compartments are in operation and there is demand, but the deep freezer compartment is not in operation and there is no demand, the refrigerator damper opens, the input end of the solenoid reversing valve is connected to the second output end, the first evaporator fan turns on, the second evaporator fan turns off, the condenser fan turns on, the first compressor turns off, and the second compressor turns on.
[0018] When the refrigerator compartment and the deep freezer compartment have an operational demand, but the freezer compartment does not, the refrigerator damper opens, the input end of the solenoid reversing valve is connected to the first output end, the first evaporator fan turns on, the second evaporator fan turns on, the condenser fan turns on, the first compressor turns on, and the second compressor turns on.
[0019] When the refrigerator compartment has an operational demand, while the freezer and deep freezer compartments do not, the refrigerator damper opens, the solenoid reversing valve closes, the first evaporator fan turns on, the second evaporator fan turns off, the condenser fan turns off, the first compressor turns off, and the second compressor turns off.
[0020] When the refrigerator compartment has an operational demand, while the freezer and deep freezer compartments do not, the refrigerator damper is closed, the input of the solenoid reversing valve is connected to the first output, the first evaporator fan is turned on, the second evaporator fan is turned on, the condenser fan is turned on, the first compressor is turned on, and the second compressor is turned on.
[0021] When the freezer compartment has an operating request status, but the refrigerator compartment and deep freezer compartment do not have an operating request status, the refrigerator damper is closed, the input end of the solenoid reversing valve is connected to the second output end, the first evaporator fan is turned on, the second evaporator fan is turned off, the condenser fan is turned on, the first compressor is turned off, and the second compressor is turned on.
[0022] When the deep freezer compartment is in operation and there is a demand, while the refrigerator and freezer compartments are not in operation and there is no demand, the refrigerator damper is closed, the input end of the solenoid reversing valve is connected to the first output end, the first evaporator fan is turned off, the second evaporator fan is turned on, the condenser fan is turned on, the first compressor is turned on, and the second compressor is turned on.
[0023] When there is no demand for operation in both the refrigerator and freezer compartments, and when there is no demand for operation in the deep freezer compartment, the refrigerator damper is closed, the solenoid reversing valve is closed, the first evaporator fan is closed, the second evaporator fan is closed, the condenser fan is closed, the first compressor is closed, and the second compressor is closed.
[0024] The above control method can be simplified into the following table form:
[0025] .
[0026] Further improvements include real-time acquisition of the internal temperature of the deep-freezing room. When the internal temperature of the deep-freezing room is greater than or equal to -18 degrees Celsius, the deep-freezing room is required to operate; when the internal temperature of the deep-freezing room is between -18 degrees Celsius and -40 degrees Celsius or less than -40 degrees Celsius, the deep-freezing room is not required to operate.
[0027] Further improvements include real-time acquisition of the internal temperature of the freezer room. When the internal temperature of the freezer room is greater than or equal to -10 degrees Celsius, the freezer room needs to operate; when the internal temperature of the freezer room is between -24 degrees Celsius and -10 degrees Celsius or less than -40 degrees Celsius, the freezer room does not need to operate.
[0028] Further improvements include real-time acquisition of the internal temperature of the cold storage room. When the internal temperature of the cold storage room is greater than or equal to 5 degrees Celsius, the freezer room needs to operate; when the internal temperature of the cold storage room is between 0 and 5 degrees Celsius or less than 0 degrees Celsius, the cold storage room does not need to operate.
[0029] In a further improvement, the deep-freezing compartment and the freezing compartment are arranged side by side on the lower side of the cabinet, while the refrigeration compartment is located on the upper side of the cabinet.
[0030] Compared with the prior art, the advantages of the present invention are as follows:
[0031] 1. Matching an overflow receiver separates the refrigerant after the first throttling into two paths: liquid and vapor-liquid mixture. The liquid refrigerant is then throttled again to improve deep-freeze efficiency. The vapor-liquid mixture is connected to the refrigerant evaporated in the refrigeration evaporator and returns to the second compressor to meet multiple temperature requirements.
[0032] 2. Matching two compressors, which are connected in series, can meet the requirement that the pressure ratio of each compressor is not particularly large, thus achieving energy saving and large cooling capacity.
[0033] 3. A one-way check valve is installed at the output end of the first compressor to prevent refrigerant backflow, which would affect the first compressor and refrigeration efficiency;
[0034] 4. When the input end of the electromagnetic reversing valve is connected to the second output end, the first evaporator, the second evaporator and the first compressor become a separate system. At this time, the first evaporator acts as a condenser, which can use the heat of the deep freezer for defrosting of the freezer, reduce the electric heating of the freezer for defrosting, improve safety and save energy. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of the refrigerant flow structure of the refrigerator refrigeration system in an embodiment of the present invention (when the input end of the electromagnetic reversing valve is connected to the first output end).
[0036] Figure 2This is a schematic diagram of the refrigerant flow structure of the refrigerator refrigeration system in an embodiment of the present invention (when the input end of the electromagnetic reversing valve is connected to the second output end).
[0037] Figure 3 This is a schematic diagram of the refrigerant flow structure of the refrigerator refrigeration system in an embodiment of the present invention (when the first evaporator needs to defrost).
[0038] Figure 4 This is a schematic diagram of the overflow reservoir in an embodiment of the present invention.
[0039] Figure 5 This is a schematic diagram of the main structure of the refrigerator in an embodiment of the present invention. Detailed Implementation
[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0041] The refrigerator refrigeration system in this embodiment includes a first compressor 1, a second compressor 2, a condenser 3, a condenser fan 4, a solenoid reversing valve 5, a return pipe 6, a first capillary tube 7, a second capillary tube 8, a third capillary tube 9, an overflow receiver 10, a first evaporator 11, a first evaporator fan 12, a second evaporator 13, a second evaporator fan 14, and a one-way check valve 15. (See also...) Figure 1 , 2 As shown in Figure 3, the condenser fan 4 is located next to the condenser 3, the first evaporator fan 12 is located next to the first evaporator 11, and the second evaporator fan 14 is located next to the second evaporator 13. The electromagnetic reversing valve 5 has an input end, a first output end, and a second output end, and the input end is selectively connected to the first output end and the second output end. The overflow reservoir 10 has an input port 10b, an output port 10c, and an overflow port 10d. In this embodiment, the overflow reservoir 10 includes a reservoir 10a, with its input port 10b located on the upper side wall or top of the reservoir, its output port 10c located at the bottom of the reservoir, and its overflow port 10d located on the side wall of the reservoir, and its position is lower than that of the input port 10b. See [reference needed]. Figure 4 As shown; the output end of the second compressor 2 is connected to the input end of the condenser 3, the output end of the condenser 3 is connected to the input end of the solenoid reversing valve 5, the first output end of the solenoid reversing valve 5 is connected to the first capillary tube 7 and then to the input port of the overflow receiver 10; the output port of the overflow receiver 10 is connected to the third capillary tube 9 and then to the input end of the second evaporator 13, the output end of the second evaporator 13 is connected to the input end of the first compressor 1, the output end of the first compressor 1 is connected to the one-way check valve 15 and then to the input end of the second compressor 2; the second output end of the solenoid reversing valve 5 is connected to the second capillary tube 8 and then to the input end of the first evaporator 11, the output end of the first evaporator 11 is connected to the return gas pipe 6 and then to the input end of the second compressor 2;
[0042] The aforementioned refrigerator refrigeration system contains refrigerant. When the input terminal of the electromagnetic reversing valve is connected to the first output terminal, the refrigerant condenses in the condenser and becomes a high-temperature liquid refrigerant. It then passes through the first capillary tube into the overflow receiver. After flowing into the overflow receiver, the refrigerant splits into two paths: one is a vapor-liquid mixture that overflows from the overflow port and enters the first evaporator for evaporative cooling; the other is pure liquid refrigerant that flows out from the output port of the overflow receiver, enters the third capillary tube for throttling, and then enters the second evaporator for evaporative cooling. It then enters the first compressor for preliminary compression. The refrigerant flowing out of the first compressor mixes with the gaseous refrigerant flowing out of the first evaporator and the return pipe before entering the second compressor together. This cycle repeats continuously. (See [reference needed]). Figure 1 As shown;
[0043] When the input terminal of the solenoid reversing valve is connected to the second output terminal, the refrigerant condenses in the condenser and becomes a high-temperature liquid refrigerant. It then passes through the second capillary tube into the first evaporator for evaporation and refrigeration, and then enters the second compressor through the return pipe. This cycle repeats continuously. (See [link to previous section]). Figure 2 As shown;
[0044] When the first evaporator needs defrosting, the second compressor and condenser fan stop operating. After being compressed by the first compressor, the gaseous refrigerant enters the first evaporator through the return pipe, where it dissipates heat and condenses while simultaneously defrosting the evaporator. The condensed refrigerant then flows through the overflow outlet into the overflow receiver, and from there flows out into the third capillary tube for throttling. It then evaporates and absorbs heat in the second evaporator before returning to the first compressor, thus beginning the next cycle. (See [link to previous section]). Figure 3 As shown.
[0045] This embodiment also provides a refrigerator, see [link / reference] Figure 5 As shown, the system includes a housing 101, within which are formed a refrigeration compartment 102, a freezer compartment 103, and a deep-freeze compartment 104. The deep-freeze compartment 104 and the freezer compartment 103 are arranged side by side on the lower side of the housing 101. The refrigeration compartment 102 is located on the upper side of the housing 101. A compression chamber 105 is located at the lower rear of the housing 101. The housing also contains the aforementioned refrigeration system, wherein a first evaporator is used to provide a cold source for the refrigeration compartment and the freezer compartment; and a second evaporator provides a cold source for the deep-freeze compartment. A refrigeration circulation duct is formed in the rear compartment of the freezer compartment, which is connected to the freezer compartment. The first evaporator is located in the rear compartment of the freezer compartment and is connected to the refrigeration circulation duct. A refrigeration circulation duct is formed in the rear compartment of the refrigerator compartment, which is connected to the refrigerator compartment. The refrigeration circulation duct and the freezer circulation duct are connected, and a refrigeration air damper is provided at the connection point. A deep-freeze circulation duct is formed in the rear compartment of the deep-freeze compartment, which is connected to the deep-freeze compartment. The second evaporator is located in the rear compartment of the deep-freeze compartment and is connected to the deep-freeze circulation duct.
[0046] In this embodiment, the operating states of the refrigeration damper, the first evaporator fan, the second evaporator fan, the refrigeration fan, the first compressor, and the second compressor, as well as the connection status of the input terminal and the first and second output terminals of the electromagnetic reversing valve, and the operating request status of the refrigeration compartment, the freezer compartment, and the deep freezer compartment are controlled in the following manner:
[0047] When the refrigerator compartment, freezer compartment, and deep freezer compartment all have operational requirements, the refrigerator damper opens, the input end of the solenoid reversing valve connects to the first output end, the first evaporator fan turns on, the second evaporator fan turns on, the condenser fan turns on, the first compressor turns on, and the second compressor turns on.
[0048] When the refrigerator and freezer compartments are in operation and there is demand, but the deep freezer compartment is not in operation and there is no demand, the refrigerator damper opens, the input end of the solenoid reversing valve is connected to the second output end, the first evaporator fan turns on, the second evaporator fan turns off, the condenser fan turns on, the first compressor turns off, and the second compressor turns on.
[0049] When the refrigerator compartment and the deep freezer compartment have an operational demand, but the freezer compartment does not, the refrigerator damper opens, the input end of the solenoid reversing valve is connected to the first output end, the first evaporator fan turns on, the second evaporator fan turns on, the condenser fan turns on, the first compressor turns on, and the second compressor turns on.
[0050] When the refrigerator compartment has an operational demand, while the freezer and deep freezer compartments do not, the refrigerator damper opens, the solenoid reversing valve closes, the first evaporator fan turns on, the second evaporator fan turns off, the condenser fan turns off, the first compressor turns off, and the second compressor turns off.
[0051] When the refrigerator compartment has an operational demand, while the freezer and deep freezer compartments do not, the refrigerator damper is closed, the input of the solenoid reversing valve is connected to the first output, the first evaporator fan is turned on, the second evaporator fan is turned on, the condenser fan is turned on, the first compressor is turned on, and the second compressor is turned on.
[0052] When the freezer compartment has an operating request status, but the refrigerator compartment and deep freezer compartment do not have an operating request status, the refrigerator damper is closed, the input end of the solenoid reversing valve is connected to the second output end, the first evaporator fan is turned on, the second evaporator fan is turned off, the condenser fan is turned on, the first compressor is turned off, and the second compressor is turned on.
[0053] When the deep freezer compartment is in operation and there is a demand, while the refrigerator and freezer compartments are not in operation and there is no demand, the refrigerator damper is closed, the input end of the solenoid reversing valve is connected to the first output end, the first evaporator fan is turned off, the second evaporator fan is turned on, the condenser fan is turned on, the first compressor is turned on, and the second compressor is turned on.
[0054] When there is no demand for operation in both the refrigerator and freezer compartments, and when there is no demand for operation in the deep freezer compartment, the refrigerator damper is closed, the solenoid reversing valve is closed, the first evaporator fan is closed, the second evaporator fan is closed, the condenser fan is closed, the first compressor is closed, and the second compressor is closed.
[0055] The above control method can be simplified as shown in the following table:
[0056] .
[0057] In specific control, the internal temperatures of the cold storage room, freezer room, and deep freezer room are acquired in real time. When the internal temperature of the deep freezer room is greater than or equal to -18 degrees Celsius, the deep freezer room needs to operate; when the internal temperature of the deep freezer room is between -18 degrees Celsius and -40 degrees Celsius or below -40 degrees Celsius, the deep freezer room does not need to operate; when the internal temperature of the freezer room is greater than or equal to -10 degrees Celsius, the freezer room needs to operate; when the internal temperature of the freezer room is between -20 degrees Celsius and -10 degrees Celsius or less than or equal to -20 degrees Celsius, the freezer room does not need to operate; when the internal temperature of the cold storage room is greater than or equal to 5 degrees Celsius, the cold storage room needs to operate; when the internal temperature of the cold storage room is between 0 degrees Celsius and 5 degrees Celsius or below 0 degrees Celsius, the cold storage room does not need to operate.
Claims
1. A refrigerator refrigeration system characterized by: The refrigerator refrigeration system comprises a first compressor, a second compressor, a condenser, a condenser fan, an electromagnetic reversing valve, a gas return pipe, a first capillary tube, a second capillary tube, a third capillary tube, an overflow liquid accumulator, a first evaporator, a first evaporator fan, a second evaporator, a second evaporator fan and a one-way check valve, wherein the condenser fan is arranged beside the condenser, the first evaporator fan is arranged beside the first evaporator, the second evaporator fan is arranged beside the second evaporator, the electromagnetic reversing valve has an input end, a first output end and a second output end, and the input end selectively communicates with the first output end and the second output end; the overflow liquid accumulator has an input port, an output port and an overflow port. The output end of the second compressor is connected with the input end of the condenser, the output end of the condenser is connected with the input end of the electromagnetic reversing valve, the first output end of the electromagnetic reversing valve is connected with the first capillary tube and then connected with the input port of the overflow liquid accumulator. The output port of the overflow liquid accumulator is connected with the third capillary tube and then connected with the input end of the second evaporator, the output end of the second evaporator is connected with the input end of the first compressor, the output end of the first compressor is connected with the one-way check valve and then connected with the input end of the second compressor. The second output end of the electromagnetic reversing valve is connected with the second capillary tube and then connected with the input end of the first evaporator, the output end of the first evaporator is connected with the gas return pipe and also connected with the input end of the second compressor. In the above refrigerator refrigeration system, refrigerant flows through, when the input end of the electromagnetic reversing valve communicates with the first output end, the refrigerant is condensed into high-temperature liquid refrigerant from the condenser, then enters the overflow liquid accumulator through the first capillary tube, and the refrigerant flowing into the overflow liquid accumulator is divided into two paths, one path is a vapor-liquid mixture overflowing from the overflow port into the first evaporator to evaporate and refrigerate, and the other path is pure liquid refrigerant flowing out of the output port of the overflow liquid accumulator, entering the third capillary tube to throttle, then entering the second evaporator to evaporate and refrigerate, and then entering the first compressor to be preliminarily compressed, the refrigerant flowing out of the first compressor mixes with the gaseous refrigerant flowing out of the first evaporator and the gas return pipe, and then enters the second compressor together, and the cycle is repeated. When the input end of the electromagnetic reversing valve communicates with the second output end, the refrigerant is condensed into high-temperature liquid refrigerant from the condenser, then enters the first evaporator to evaporate and refrigerate, and then enters the second compressor through the gas return pipe, and the cycle is repeated. When the first evaporator needs to be defrosted, the second compressor and the condenser fan stop running, the gaseous refrigerant enters the first evaporator through the gas return pipe after being compressed by the first compressor, and the gaseous refrigerant is condensed in the first evaporator to defrost the first evaporator, the refrigerant condenses into liquid refrigerant and enters the overflow liquid accumulator through the overflow port, then flows out of the output port of the overflow liquid accumulator, enters the third capillary tube to throttle, then enters the second evaporator to evaporate and absorb heat, then enters the first compressor, and then enters the next cycle.
2. The refrigerator refrigeration system of claim 1, wherein: The first capillary tube and the second capillary tube are connected with the gas return pipe by oxygen welding or tin welding.
3. The refrigerator refrigeration system of claim 1, wherein: The overflow type liquid reservoir comprises a liquid storage cylinder, an input port of which is located on the upper side wall or top of the liquid storage cylinder, an output port of which is located on the bottom of the liquid storage cylinder, and an overflow port of which is located on the side wall of the liquid storage cylinder and is lower than the input port.
4. A refrigerator comprising a cabinet in which a refrigerating compartment and a freezing compartment are formed, characterized by: The box is further provided with a freezing compartment, and the box is provided with the refrigerating system as claimed in claim 1, the first evaporator is used for providing cold source for the refrigerating compartment and the freezing compartment, and the second evaporator is used for providing cold source for the freezing compartment.
5. The refrigerator according to claim 4, characterized in that: The box is further provided with a freezing circulation air duct which is communicated with the freezing compartment and is located at the rear side of the freezing compartment, the first evaporator is located at the rear side of the freezing compartment and is communicated with the freezing circulation air duct, the box is further provided with a refrigerating circulation air duct which is communicated with the refrigerating compartment and is located at the rear side of the refrigerating compartment, the refrigerating circulation air duct and the freezing circulation air duct are communicated, and the refrigerating circulation air duct is provided with a refrigerating air door, and the box is further provided with a deep-freezing circulation air duct which is communicated with the deep-freezing compartment and is located at the rear side of the deep-freezing compartment, the second evaporator is located at the rear side of the deep-freezing compartment and is communicated with the deep-freezing circulation air duct.
6. The refrigerator according to claim 5, characterized in that: The working states of the refrigerating air door, the first evaporator fan, the second evaporator fan, the refrigerating fan, the first compressor and the second compressor, and the communication state between the input end and the first output end and the second output end of the electromagnetic reversing valve are controlled by the following method according to the operation request state of the refrigerating compartment, the freezing compartment and the deep-freezing compartment: When the operation request state of the refrigerating compartment, the freezing compartment and the deep-freezing compartment all have demands, the refrigerating air door is opened, the input end of the electromagnetic reversing valve is communicated with the first output end, the first evaporator fan is opened, the second evaporator fan is opened, the condenser fan is opened, the first compressor is opened, and the second compressor is opened; When the operation request state of the refrigerating compartment and the freezing compartment has demands, and the operation request state of the deep-freezing compartment has no demand, the refrigerating air door is opened, the input end of the electromagnetic reversing valve is communicated with the second output end, the first evaporator fan is opened, the second evaporator fan is closed, the condenser fan is opened, the first compressor is closed, and the second compressor is opened; When the operation request state of the refrigerating compartment and the deep-freezing compartment has demands, and the operation request state of the freezing compartment has no demand, the refrigerating air door is opened, the input end of the electromagnetic reversing valve is communicated with the first output end, the first evaporator fan is opened, the second evaporator fan is opened, the condenser fan is opened, the first compressor is opened, and the second compressor is opened; When the operation request state of the refrigerating compartment has demands, and the operation request state of the freezing compartment and the deep-freezing compartment has no demand, the refrigerating air door is opened, the electromagnetic reversing valve is closed, the first evaporator fan is opened, the second evaporator fan is closed, the condenser fan is closed, the first compressor is closed, and the second compressor is closed; When the operation request state of the refrigerating compartment has demands, and the operation request state of the freezing compartment and the deep-freezing compartment has no demand, the refrigerating air door is closed, the input end of the electromagnetic reversing valve is communicated with the first output end, the first evaporator fan is opened, the second evaporator fan is opened, the condenser fan is opened, the first compressor is opened, and the second compressor is opened; When the running request state of the freezing compartment has demand, and the running request states of the refrigerating compartment and the freezing compartment have no demand, the refrigerating damper is closed, the input end of the electromagnetic reversing valve is communicated with the second output end, the first evaporator fan is opened, the second evaporator fan is closed, the condenser fan is opened, the first compressor is closed, and the second compressor is opened; When the running request state of the freezing compartment has demand, and the running request states of the refrigerating compartment and the freezing compartment have no demand, the refrigerating damper is closed, the input end of the electromagnetic reversing valve is communicated with the first output end, the first evaporator fan is closed, the second evaporator fan is opened, the condenser fan is opened, the first compressor is opened, and the second compressor is opened; When the running request states of the refrigerating compartment and the freezing compartment have no demand, and the running request state of the freezing compartment has no demand, the refrigerating damper is closed, the electromagnetic reversing valve is closed, the first evaporator fan is closed, the second evaporator fan is closed, the condenser fan is closed, the first compressor is closed, and the second compressor is closed.
7. The refrigerator according to claim 6, characterized in that: The internal temperature of the freezing compartment is acquired in real time, and the freezing compartment has running demand when the internal temperature of the freezing compartment is greater than or equal to -18 DEG C; the freezing compartment has no running demand when the internal temperature of the freezing compartment is between -18 DEG C and -40 DEG C or less than -40 DEG C.
8. The refrigerator according to claim 6, characterized in that: The internal temperature of the freezing compartment is acquired in real time, and the freezing compartment has running demand when the internal temperature of the freezing compartment is greater than or equal to -10 DEG C; the freezing compartment has no running demand when the internal temperature of the freezing compartment is between -24 DEG C and -10 DEG C or less than -40 DEG C.
9. The refrigerator according to claim 6, characterized in that: The internal temperature of the refrigerating compartment is acquired in real time, and the refrigerating compartment has running demand when the internal temperature of the refrigerating compartment is greater than or equal to 5 DEG C; the refrigerating compartment has no running demand when the internal temperature of the refrigerating compartment is between 0 DEG C and 5 DEG C.
10. The refrigerator according to claim 6, characterized in that: The freezing compartment and the freezing compartment are arranged side by side on the lower side of the box body, and the refrigerating compartment is arranged on the upper side of the box body.
Citation Information
Patent Citations
Multiple-temperature zone refrigeration circuit and multiple-temperature zone refrigeration device
CN106440444A
Refrigerator
CN110411112A