Refrigeration system and refrigeration device

Abstract

This application provides a refrigeration system and refrigeration equipment. The refrigeration system includes: a compressor; a condenser, the inlet of which is connected to the compressor's discharge pipe; a refrigeration evaporator for cooling the freezer compartment; a cryogenic evaporator for cooling the cryogenic compartment; a first throttling device connected between the condenser outlet and the refrigeration evaporator inlet; a second throttling device connected between the condenser outlet and the cryogenic evaporator inlet; and an electronically controlled valve including a first valve, a second valve, and a third valve, wherein the first valve is connected to the refrigeration evaporator outlet, the second valve is connected to the cryogenic evaporator outlet, and the third valve is connected to the compressor's intake pipe. When the cryogenic compartment is cooled independently, the refrigeration evaporator can store some refrigerant, reducing the evaporation pressure and temperature within the evaporator, thus facilitating the achievement of lower temperatures. Consequently, the compressor's speed can be reduced, resulting in energy savings.

Description

Technical Field

[0001] This application belongs to the field of refrigerator technology, and more specifically, relates to a refrigeration system and refrigeration equipment. Background Technology

[0002] Currently, refrigerators with a deep-cold compartment are designed as separate compartments with their own refrigeration systems. In existing independent deep-cold systems, the deep-cold evaporator and the freezing evaporator circulate independently and need to maintain different pressures simultaneously, resulting in large system pressure fluctuations. Furthermore, the compressor needs to operate at a high load continuously to meet the deep-cold pressure requirements in order to reach the required temperature of the deep-cold compartment, leading to high energy consumption. Utility Model Content

[0003] The purpose of this application is to provide a refrigeration system and refrigeration equipment to solve the technical problem of high energy consumption in existing deep-freeze refrigerators.

[0004] To achieve the above objectives, the technical solution adopted in this application is: to provide a refrigeration system applied in a refrigeration device, wherein the refrigeration device includes a freezer compartment and a cryogenic compartment, and the refrigeration system includes:

[0005] compressor;

[0006] A condenser, the inlet of which is connected to the exhaust pipe of the compressor;

[0007] A refrigeration evaporator is used to cool the refrigeration chamber;

[0008] A cryogenic evaporator is used to cool the cryogenic chamber.

[0009] A first throttling device is connected between the outlet of the condenser and the inlet of the refrigeration evaporator;

[0010] The second throttling device is connected between the outlet of the condenser and the inlet of the cryogenic evaporator;

[0011] The electrically controlled valve includes a first valve, a second valve, and a third valve. The first valve is connected to the outlet of the refrigeration evaporator, the second valve is connected to the outlet of the cryogenic evaporator, and the third valve is connected to the intake pipe of the compressor.

[0012] As an alternative implementation of the first aspect, the cryogenic compartment is located inside the freezer.

[0013] As an optional implementation of the first aspect, the first throttling device is a cryogenic capillary, and the second throttling device is a cryogenic capillary, wherein the length of the cryogenic capillary is greater than the length of the cryogenic capillary.

[0014] As an optional implementation of the first aspect, the electrically controlled valve is a two-inlet, one-outlet electric valve or a solenoid valve.

[0015] As an optional implementation of the first aspect, it further includes a first temperature sensor for detecting the freezer compartment and a second temperature sensor for detecting the cryogenic compartment.

[0016] As an optional implementation of the first aspect, it also includes structural space for adjusting the amount of refrigerant participating in the cycle in the second throttling device and the cryogenic evaporator.

[0017] As an optional implementation of the first aspect, the structural space is a buffer tank, which is disposed between the inlet of the first throttling device and the outlet of the condenser.

[0018] In a second aspect, a refrigeration device is provided, comprising a refrigeration system as described in any one of the first aspects.

[0019] As an alternative implementation of the second aspect, the cryogenic chamber is covered with a cryogenic insulation layer.

[0020] As an optional implementation of the second aspect, there are gaps between the top wall of the freezer, the bottom wall of the freezer, the door of the freezer, and the two side walls near the door of the freezer and the cryogenic insulation layer.

[0021] The beneficial effects of this application are as follows: This embodiment achieves evaporation pressure regulation through the control of an electronically controlled valve. When the cryogenic compartment and the freezer compartment are cooling simultaneously, the compressor maintains the higher evaporation pressure required by the refrigeration evaporator at a lower speed; when the cryogenic compartment is cooling alone, the compressor maintains the lower evaporation pressure required by the cryogenic evaporator at a higher speed. By balancing the pressures within the refrigeration evaporator and the cryogenic evaporator, the compressor does not need to frequently adapt to different pressure requirements, thus avoiding frequent start-stop or speed adjustments. Furthermore, when the cryogenic compartment is cooling alone, since some refrigerant can be stored in the refrigeration evaporator, the evaporation pressure within the cryogenic evaporator decreases, and the evaporation temperature also decreases accordingly, which is beneficial for achieving lower temperatures. Therefore, the increase in compressor speed can be appropriately reduced, which is beneficial for saving energy. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1This is a schematic diagram of the structural principle of the refrigeration system provided in the embodiments of this application;

[0024] Figure 2 A schematic diagram of the refrigerant circulation during the simultaneous cooling stage of the freezer and cryogenic chamber provided in an embodiment of this application;

[0025] Figure 3 A schematic diagram of the refrigerant cycle during the cryogenic refrigeration stage provided in this application embodiment;

[0026] Figure 4 This is a schematic diagram of the refrigerant cycle after the cryogenic refrigeration stage, provided in an embodiment of this application.

[0027] Figure 5 This is a schematic diagram showing the layout of the freezer compartment and the cryogenic compartment in the refrigeration equipment provided in the embodiments of this application.

[0028] The following are the labeling elements in the figure:

[0029] 1-Compressor, 2-Condenser, 3-Refrigeration capillary tube, 4-Refrigeration evaporator, 5-Electric valve, 51-First valve, 52-Second valve, 53-Third valve, 6-Cryogenic capillary tube, 7-Cryogenic evaporator, 8-Refrigeration insulation layer, 9-Cryogenic insulation layer, 10-Freezer compartment, 11-Cryogenic compartment. Detailed Implementation

[0030] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0031] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0034] It should be understood that in the embodiments of this application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the form in which different components in the circuit structure are connected through physical lines that can transmit electrical signals, such as copper foil of a printed circuit board (PCB) or wires.

[0035] In the description of the embodiments of this application, the technical 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0039] Please see Figure 1 The present application provides a description of a refrigeration system, which is applied in a refrigeration device including a freezer compartment 10 and a cryogenic compartment 11. The refrigeration system includes: a compressor 1; a condenser 2, the inlet of which is connected to the exhaust pipe of the compressor 1; a freezer evaporator 4 for cooling the freezer compartment 10; a cryogenic evaporator 7 for cooling the cryogenic compartment 11; a first throttling device connected between the outlet of the condenser 2 and the inlet of the freezer evaporator 4; a second throttling device connected between the outlet of the condenser 2 and the inlet of the cryogenic evaporator 7; and an electrically controlled valve including a first valve 51, a second valve 52, and a third valve 53 that can be independently controlled. The first valve 51 is connected to the outlet of the freezer evaporator 4, the second valve 52 is connected to the outlet of the cryogenic evaporator 7, and the third valve 53 is connected to the intake pipe of the compressor 1.

[0040] Specifically, the refrigeration equipment can be a deep-freeze refrigerator or freezer. The target temperature of the freezer compartment 10 is usually -18°C, while the temperature of the deep-freeze compartment 11 is lower, usually designed at -30°C.

[0041] Compressor 1, as the power source of the refrigeration system, is responsible for compressing refrigerant vapor, increasing its pressure and temperature, and driving the refrigerant to circulate in the system to complete the refrigeration cycle. In this embodiment, the compressor 1 has an adjustable speed.

[0042] Condenser 2 is responsible for condensing the high-temperature and high-pressure refrigerant vapor discharged from compressor 1 into high-pressure liquid refrigerant. In this process, condenser 2 dissipates the heat of the refrigerant into the surrounding environment, realizing phase change.

[0043] The freezer evaporator 4 is located in the freezer compartment 10 area of ​​the refrigerator. It is responsible for absorbing heat in the freezer compartment 10, causing the refrigerant to evaporate, thereby lowering the temperature of the freezer compartment 10 and maintaining the freezer compartment 10 at its target temperature (e.g., -18°C).

[0044] The first throttling device can be a capillary tube or an electronic expansion valve, connected between the outlet of condenser 2 and the inlet of refrigeration evaporator 4. The first throttling device can reduce the pressure and temperature of the refrigerant, allowing the refrigerant to effectively absorb heat and evaporate after entering the refrigeration evaporator 4.

[0045] The cryogenic evaporator 7 is located in the cryogenic compartment 11 of the refrigerator and is responsible for absorbing heat in the cryogenic compartment 11, causing the refrigerant to evaporate, thereby lowering the temperature of the cryogenic compartment 11 to a lower level (e.g., below -30°C).

[0046] The second throttling device can be a capillary tube or an electronic expansion valve, connected between the outlet of condenser 2 and the inlet of cryogenic evaporator 7. The function of the second throttling device is similar to that of the first throttling device, but it is used to supply refrigerant to the cryogenic evaporator 7.

[0047] The electronically controlled valve integrates three independently controllable valves: valve 51, valve 52, and valve 53. Valve 51 is connected to the outlet of the refrigeration evaporator 4 and is used to control the discharge of refrigerant flowing through the refrigeration evaporator 4. Valve 52 is connected to the outlet of the cryogenic evaporator 7 and is used to control the discharge of refrigerant flowing through the cryogenic evaporator 7. Valve 53 is connected to the intake pipe (suction pipe) of the compressor 1 and is used to control the flow rate of refrigerant entering the compressor 1.

[0048] In this embodiment, compressor 1, condenser 2, cryogenic capillary tube 3, cryogenic evaporator 4, and electronically controlled valve are connected in sequence to form a refrigeration loop. Compressor 1, condenser 2, cryogenic capillary tube 6, cryogenic evaporator 7, and electronically controlled valve are connected in sequence to form a cryogenic loop.

[0049] The refrigeration system in this embodiment can achieve efficient refrigeration by controlling the speed of compressor 1 and the opening and closing state of the electronically controlled valve in different operating modes. The specific working principle is as follows:

[0050] Normal cooling stage (simultaneous cooling of freezer compartment 10 and cryogenic compartment 11):

[0051] See Figure 2 , Figure 2 A schematic diagram of the refrigerant circulation during the simultaneous cooling phase of the freezer compartment 10 and the cryogenic compartment 11 is disclosed.

[0052] During normal refrigeration, the first valve 51, the second valve 52, and the third valve 53 of the electronically controlled valve are all in the open state.

[0053] Compressor 1 starts and runs at a set speed (e.g., 3000 rpm). After being condensed by condenser 2, the refrigerant enters the first throttling device and the second throttling device respectively. The refrigerant flowing through the first throttling device then enters the refrigeration evaporator 4, and the refrigerant flowing through the second throttling device enters the cryogenic evaporator 7. The refrigeration evaporator 4 and the cryogenic evaporator 7 simultaneously evaporate and absorb heat, providing cooling to the freezer compartment 10 and the cryogenic compartment 11 respectively.

[0054] During the normal refrigeration stage, the freezer compartment 10 and the cryogenic compartment 11 can be cooled simultaneously, so that the freezer compartment 10 reaches the preset freezing temperature (e.g., -20℃). At the same time, the temperature of the cryogenic compartment 11 can also reach the preset freezing temperature (e.g., -20℃). Then the refrigeration system will start the cryogenic refrigeration stage.

[0055] Cryogenic refrigeration stage:

[0056] See Figure 3 , Figure 3 A schematic diagram of the refrigerant cycle during the cryogenic refrigeration stage has been published.

[0057] Once the freezer compartment 10 reaches the preset freezing temperature, in order to achieve an even lower cryogenic temperature in the cryogenic compartment 11, the control system will perform the following operations: close the first valve 51 of the electronically controlled valve, while keeping the second valve 52 and the third valve 53 open. Simultaneously, the compressor 1 will adjust to a higher speed (e.g., above 4000 rpm), increasing the intake and exhaust volumes, thereby reducing the evaporation pressure and temperature of the cryogenic evaporator.

[0058] It is worth noting that although the first valve 51 is closed, the refrigerant from the condenser 2 will still pass through the first and second throttling devices and enter the refrigeration evaporator 4 and the cryogenic evaporator 7 respectively. However, because the first valve 51 is closed, the refrigerant flowing to the refrigeration evaporator 4 will be stored inside the refrigeration evaporator 4. At this time, the amount of refrigerant participating in the refrigeration cycle in the entire refrigeration system is less than that in the normal refrigeration stage, and the internal pressure of the entire refrigeration cycle system is reduced. In addition, the high-speed compressor 1 improves the suction and discharge capacity. With the first valve 51 closed, the evaporation pressure in the cryogenic evaporator 7 will decrease. According to the relationship between the evaporation temperature and pressure of the refrigerant, the evaporation temperature will also decrease, which is beneficial for achieving a lower temperature.

[0059] After the cryogenic refrigeration stage is completed:

[0060] See Figure 4 , Figure 4 A schematic diagram of the refrigerant cycle after the cryogenic refrigeration stage has been published.

[0061] When the cryogenic chamber 11 reaches the preset cryogenic temperature (below -35℃), the compressor 1 stops, and at the same time the third valve 53 of the electronic control valve closes.

[0062] At this point, the first valve 51 will reopen, allowing refrigerant to enter the cryogenic evaporator 7 from the refrigeration evaporator 4 to balance the pressure within the cryogenic evaporator 7 and the refrigeration evaporator 4, preparing for the next cycle. Furthermore, the entry of refrigerant from the refrigeration evaporator 4 into the cryogenic evaporator 7 maintains the required cooling capacity and temperature for cryogenic cooling and prevents excessive refrigerant from flowing from the condenser 2 through the second throttling device into the cryogenic evaporator 7 due to the pressure difference between the cryogenic evaporator 7 and the refrigeration evaporator 4, which would otherwise cause the temperature inside the cryogenic evaporator 7 to rise too quickly.

[0063] When the temperature of the cryogenic compartment 11 rises to the cryogenic temperature threshold (e.g., -30°C), while the temperature of the freezer compartment 10 falls below the freezing temperature threshold (e.g., -18°C), the first valve 51 closes again, initiating the cryogenic refrigeration stage. When the temperature of the freezer compartment 10 rises to the freezing temperature threshold, while the temperature of the cryogenic compartment 11 falls below the cryogenic temperature threshold, the second valve 52 closes, controlling the refrigerant circulation in the refrigeration cycle loop. When the temperature of the freezer compartment 10 rises to the freezing temperature threshold, and the temperature of the cryogenic compartment 11 rises to the cryogenic temperature threshold, the normal refrigeration stage begins. This cycle continues.

[0064] Because the cryogenic compartment 11 has a lower temperature, the cryogenic evaporator 7 requires a lower evaporation temperature, while the refrigeration evaporator 4 has a higher evaporation temperature. Therefore, when the refrigeration compartment 10 and the cryogenic compartment 11 refrigerate separately, the evaporation pressures of the refrigeration system are different. In existing independent cryogenic systems, the independent cryogenic system and the refrigeration system circulate independently, resulting in significant differences in evaporation pressure. The compressor 1 needs to frequently adapt to different pressure requirements, leading to frequent start-stop cycles or speed adjustments over a wide range. Each switching and adjustment requires a certain amount of energy. Furthermore, due to the large difference in the two evaporation pressures, and the need to maintain them separately, this pressure mismatch leads to instability in the overall refrigeration system, requiring more control to maintain balance, generating additional energy losses, and causing a decrease in the energy efficiency ratio.

[0065] Because the target temperature of the deep-cooling compartment 11 is very low, a higher compressor speed (such as above 4500 rpm) is required to reach the required evaporation temperature. In addition, the existing refrigerators have a large independent deep-cooling compartment 11, which requires a large-capacity compressor 1 to provide sufficient suction and exhaust capacity to maintain the ultra-low temperature evaporation environment, resulting in a large cooling load and a significant increase in energy consumption.

[0066] This embodiment achieves evaporation pressure regulation through the control of an electronically controlled valve. When both the cryogenic compartment 11 and the freezer compartment 10 are cooling simultaneously, the compressor 1 maintains the higher evaporation pressure required by the refrigeration evaporator 4 at a lower speed. When the cryogenic compartment 11 is cooling alone, the compressor 1 maintains the lower evaporation pressure required by the cryogenic evaporator 7 at a higher speed. By balancing the pressures within the refrigeration evaporator 4 and the cryogenic evaporator 7, the compressor 1 does not need to frequently adapt to different pressure requirements, thus avoiding frequent start-stop or speed adjustments. Furthermore, when the cryogenic compartment 11 is cooling alone, since the refrigeration evaporator 4 can store some refrigerant, the evaporation pressure within the cryogenic evaporator 7 decreases, and the evaporation temperature also decreases accordingly, which is beneficial for achieving lower temperatures. Therefore, the increase in compressor speed can be appropriately reduced, which helps save energy.

[0067] As an alternative implementation, the cryogenic compartment 11 is located inside the freezer compartment 10.

[0068] Normally, users need a small amount of deep-cold refrigeration space, and only some special foods need to be stored in deep-cold. Therefore, in this embodiment, the deep-cold compartment 11 is designed inside the freezer compartment 10, which can achieve the purpose of deep-cold refrigeration with less refrigerator energy consumption.

[0069] Since the deep-cooling compartment 11 is a sub-compartment of the freezer compartment 10, during the normal cooling phase, the cooling of the freezer compartment 10 can provide initial cooling for the deep-cooling compartment 11, reducing the dependence on the high power and cooling capacity of the compressor 1 required when the deep-cooling system is started alone, which reduces the overall energy consumption of the refrigerator.

[0070] As an optional implementation, the first throttling device is a cryogenic capillary 3, and the second throttling device is a cryogenic capillary 6, the length of which is greater than the length of the cryogenic capillary 3.

[0071] Specifically, when the refrigerant flows through the small-diameter refrigeration capillary tube 3, it generates a large pressure drop and temperature drop, causing the refrigerant to be in a mixed state of liquid and gas when it enters the refrigeration evaporator 4. This allows the refrigerant to efficiently absorb heat and evaporate within the refrigeration evaporator 4, providing the required cooling for the freezer compartment 10.

[0072] Similarly, the function of the cryogenic capillary tube 6 is similar to that of the refrigeration capillary tube 3, but the cryogenic capillary tube 6 is longer than the refrigeration capillary tube 3. Under the same inner diameter, refrigerant type, and inlet pressure, the longer the capillary tube, the greater the throttling pressure drop it generates. A larger pressure drop leads to a lower refrigerant pressure at the inlet of the cryogenic evaporator 7. According to the relationship between refrigerant pressure and temperature, a lower evaporation pressure leads to a lower evaporation temperature. A lower evaporation temperature means a larger temperature difference between the cryogenic evaporator 7 and the cryogenic chamber 11, which allows the refrigerant to absorb heat from the cryogenic chamber 11 more effectively, thereby producing a stronger cooling effect in the cryogenic chamber 11.

[0073] As an optional implementation, the electrically controlled valve is a two-inlet, one-outlet electric valve 5 or a solenoid valve.

[0074] Specifically, "two inlets and one outlet" means that the electronically controlled valve has two independent inlets and one common outlet. As described in the above embodiment, these two inlets are connected to the outlets of the refrigeration evaporator 4 and the cryogenic evaporator 7, respectively, and the outlet is ultimately connected to the intake pipe of the compressor 1.

[0075] The electric valve 5 or solenoid valve can precisely control the refrigerant flow at each evaporator outlet according to the instructions of the refrigerator's main control board. By independently controlling the opening and closing of the first valve 51 and the second valve 52, the refrigerator's control system can flexibly select whether to supply refrigerant to the compressor 1 from the freezing evaporator 4 or the deep-freezing evaporator 7 (or both simultaneously).

[0076] As an optional implementation, the refrigeration system also includes a first temperature sensor for detecting the freezer compartment 10 and a second temperature sensor for detecting the cryogenic compartment 11.

[0077] Specifically, in this embodiment, the first temperature sensor is installed inside the freezer compartment 10, which can accurately reflect the actual temperature inside the freezer compartment 10. When the temperature of the freezer compartment 10 is higher than the freezing temperature threshold (e.g., -18°C), the refrigerator's control system will start the refrigeration cycle. When the temperature reaches or falls below the preset freezing target temperature, the freezing process will be stopped or reduced.

[0078] Similarly, a second temperature sensor is installed inside the cryogenic compartment 11 to accurately measure its actual temperature. When the temperature of the cryogenic compartment 11 is higher than the set cryogenic temperature threshold (e.g., -30°C), the refrigerator's control system activates cryogenic cooling by controlling the compressor 1 speed and the electronically controlled valve. When the temperature of the cryogenic compartment 11 is detected to be at or below the preset cryogenic temperature (e.g., below -35°C), the control system adjusts the state of the electronically controlled valve to maintain the cryogenic temperature. When the temperature rises back to -30°C, the cryogenic cooling process is restarted.

[0079] As an optional implementation, the refrigeration system also includes structural space for adjusting the amount of refrigerant involved in the cycle in the second throttling device and the cryogenic evaporator 7.

[0080] It is easy to understand that when the first valve 51 is closed during cryogenic refrigeration, the refrigerant will accumulate in the refrigeration evaporator 4 and its connecting pipes. The internal volume formed by the refrigeration evaporator 4 and its connecting pipes constitutes the structural space. In this embodiment, a structural space can also be specifically designed. This structural space refers to the area in the refrigeration system piping that can accommodate, store, or buffer a certain amount of refrigerant. It can be an extended pipe, a liquid receiver, or a buffer tank, etc.

[0081] Since the cryogenic compartment 11 has already been initially cooled to around -20°C by the freezer compartment 10, the cryogenic evaporator 7 only needs to lower the temperature from -20°C to below -35°C. The heat load is far less than that of existing independent cryogenic systems (which directly lower the temperature from room temperature to below -35°C). Furthermore, since the cryogenic compartment 11 is a sub-compartment within the freezer compartment 10, its space is smaller and it doesn't require much refrigerant to participate in the cycle. Therefore, storing some refrigerant in the freezer evaporator 4 and its independently designed structural space reduces the total amount of refrigerant involved in the cycle, thereby lowering the internal pressure of the entire refrigeration cycle system. Based on the relationship between refrigerant evaporation temperature and pressure, a decrease in pressure can lower the evaporation temperature, which is beneficial for achieving even lower temperatures and thus for reducing the temperature of the cryogenic compartment 11. In addition, during cryogenic refrigeration, the compressor 1 speed is increased to over 4000 rpm. By increasing the suction and discharge capacity, the decrease in cycle efficiency caused by the reduction in refrigerant charge can be compensated. Simply increasing the refrigerant charge to maintain a high cooling capacity requires the compressor 1 to operate continuously under high load (as in existing high-capacity compressors), resulting in extremely high energy consumption.

[0082] As an optional implementation, the structural space is a buffer tank, which is located between the inlet of the first throttling device and the outlet of the condenser 2.

[0083] Specifically, by placing the buffer tank between the inlet of the first throttling device and the outlet of the condenser 2, a portion of the refrigerant can be stored in the buffer tank, and this will hardly affect the normal operation of the first throttling device and the refrigeration evaporator 4.

[0084] See Figure 5 This application also discloses a refrigeration device, including the refrigeration system described above.

[0085] For details, see Figure 5 The cryogenic compartment 11 is located inside the freezer compartment 10. The freezer compartment 10 is covered with a freezer insulation layer 8, and the cryogenic compartment 11 is covered with a cryogenic insulation layer 9.

[0086] Specifically, the cryogenic insulation layer 9 wraps around the outer wall of the cryogenic compartment 11, blocking heat conduction between the cryogenic compartment 11 and the freezer compartment 10, reducing the loss of cold energy in the cryogenic compartment 11, and improving the stability of the cryogenic temperature.

[0087] As an optional implementation, gaps are provided between the top wall of the freezer 10, the bottom wall of the freezer 10, the door of the freezer 10, and the two side walls of the door near the freezer 10 and the cryogenic insulation layer 9.

[0088] Specifically, the cryogenic chamber 11 can be a cuboid structure, and the door of the cryogenic chamber 11 can be a drawer-type door. The width of the gap can be adjusted according to the actual situation, so that the space where the gap is located can also be utilized.

[0089] The air layer within the gap utilizes the low thermal conductivity of air to further reduce heat transfer between the cryogenic compartment 11 and the freezer compartment 10. Simultaneously, the gap prevents direct contact between the cryogenic insulation layer 9 and the wall of the freezer compartment 10, reducing heat loss due to heat conduction from contact.

[0090] This embodiment reduces heat transfer from the cryogenic compartment 11 to the freezer compartment 10 through a combination design of the cryogenic insulation layer 9 and the gap, thereby reducing the cooling load of the cryogenic evaporator 7 and thus reducing the energy consumption of the refrigerator.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A refrigeration system, characterized in that, It is used in refrigeration equipment, which includes a freezer compartment and a cryogenic compartment, and the refrigeration system includes: compressor; A condenser, the inlet of which is connected to the exhaust pipe of the compressor; A refrigeration evaporator is used to cool the refrigeration chamber; A cryogenic evaporator is used to cool the cryogenic chamber. A first throttling device is connected between the outlet of the condenser and the inlet of the refrigeration evaporator; The second throttling device is connected between the outlet of the condenser and the inlet of the cryogenic evaporator; The electrically controlled valve includes a first valve, a second valve, and a third valve. The first valve is connected to the outlet of the refrigeration evaporator, the second valve is connected to the outlet of the cryogenic evaporator, and the third valve is connected to the intake pipe of the compressor.

2. The refrigeration system as described in claim 1, characterized in that, The cryogenic chamber is located inside the freezer.

3. The refrigeration system as described in claim 1, characterized in that, The first throttling device is a cryogenic capillary, and the second throttling device is a cryogenic capillary, wherein the length of the cryogenic capillary is greater than the length of the cryogenic capillary.

4. The refrigeration system as described in claim 1, characterized in that, The electrically controlled valve is either a two-inlet, one-outlet electric valve or a solenoid valve.

5. The refrigeration system as described in claim 1, characterized in that, It also includes a first temperature sensor for detecting the freezer compartment and a second temperature sensor for detecting the cryogenic compartment.

6. The refrigeration system according to any one of claims 1-5, characterized in that, It also includes structural space for adjusting the amount of refrigerant involved in the cycle in the second throttling device and the cryogenic evaporator.

7. The refrigeration system as described in claim 6, characterized in that, The structural space is a buffer tank, which is located between the inlet of the first throttling device and the outlet of the condenser.

8. A refrigeration device, characterized in that, Includes the refrigeration system as described in any one of claims 1-7.

9. The refrigeration equipment as described in claim 8, characterized in that, The cryogenic chamber is covered with a cryogenic insulation layer.

10. The refrigeration equipment as described in claim 9, characterized in that, There are gaps between the top wall, bottom wall, door, and side walls near the door of the freezer and the cryogenic insulation layer.

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