Refrigerating system and refrigerating equipment

Abstract

The utility model provides a refrigerating system and refrigerating equipment. The refrigerating system comprises a compressor, a switching assembly, a condenser, an evaporator, a pressure regulating valve, a heating pipe and a liquid discharging pipe. A first interface of the switching assembly is connected with the compressor; the condenser is connected with the second connector and the evaporator. The compressor, the switching assembly, the condenser and the evaporator are sequentially connected to form a first refrigerant circulation loop. The pressure regulating valve is connected with the third connector and the heating pipe. The compressor, the switching assembly, the pressure regulating valve, the heating pipe and the liquid discharging pipe are sequentially connected to form a second refrigerant circulation loop. According to the scheme, efficient and energy-saving defrosting is achieved through hot gas bypass dynamic control, and meanwhile the temperature stability in the box is ensured. As the heater is replaced by the heating pipe in the scheme, energy is saved by more than 30% compared with the traditional scheme; through linkage control of an air door, the temperature rise of the refrigerating chamber does not exceed 1.5 DEG C in the defrosting period; a mechanical pressure valve is adopted for redundancy protection, and the overpressure risk of the refrigerating system is avoided.

Description

Technical Field

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

[0002] Currently, defrosting technology for refrigeration equipment mainly relies on electric heaters, such as quartz tubes and aluminum foil heaters. The heaters are controlled to start and stop at fixed time intervals or temperature thresholds. However, this approach has the following drawbacks: the defrosting heaters typically have a power of 100-300W, and frequent start-stop cycles result in defrosting power consumption accounting for 15%-25% of the total power consumption of the unit, especially in high humidity environments where energy consumption increases further; during forced defrosting, the temperature in the refrigerator compartment can easily rise by 3-5℃, affecting food preservation; the heating elements are exposed to high temperature and humidity environments for extended periods, which may cause aluminum foil breakdown, quartz tube bursting, or circuit aging, posing risks of leakage and fire; traditional time / temperature threshold control cannot dynamically adapt to changes in frost thickness, resulting in ineffective heating—running at full power when the frost layer is thin or incomplete defrosting—and insufficient heating time when the frost layer is too thick. Utility Model Content

[0003] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of this utility model is to provide a refrigeration system, including a compressor, a switching component, a condenser, an evaporator, a pressure regulating valve, a heating element, and a drain pipe;

[0004] The switching component includes a first interface, a second interface, and a third interface, wherein the first interface is connected to the compressor;

[0005] The condenser is connected to the second interface of the switching component and the evaporator respectively, and the compressor, the switching component, the condenser and the evaporator are connected in sequence to form a first refrigerant flow loop;

[0006] The pressure regulating valve is connected to the third interface of the switching assembly and the heating tube respectively. The compressor, the switching assembly, the pressure regulating valve, the heating tube and the drain pipe are connected in sequence to form a second refrigerant flow circuit. The pressure regulating valve is connected to the exhaust port of the compressor via the switching assembly.

[0007] The second and third interfaces of the switching component are not simultaneously open; the switching component is used to control the opening and closing of the first refrigerant flow circuit and the second refrigerant flow circuit.

[0008] In one possible implementation, the refrigeration system further includes a communication component;

[0009] The communication component includes a fourth interface, a fifth interface, and a sixth interface. The fourth interface is connected to the compressor, the fifth interface is connected to the evaporator, and the sixth interface is connected to the drain pipe. All three interfaces are open to flow.

[0010] In one possible implementation, the refrigeration system further includes a first sensor and a second sensor;

[0011] The first sensor is located in the fins of the evaporator;

[0012] The second sensor is located on the surface of the evaporator.

[0013] In one possible implementation, the refrigeration system further includes a control module electrically connected to the first sensor and the second sensor, for receiving the thickness signal from the first sensor and the temperature signal from the second sensor;

[0014] The control module is also electrically connected to the switching component, and the control module is also used to control the connection and disconnection of the first interface and the second interface or the third interface according to the thickness signal and the temperature signal.

[0015] In one possible implementation, the evaporator includes a hydrophobic nanocoating on its surface.

[0016] In one possible implementation, the drain pipe includes a graphene heating film; the graphene heating film is connected to the control module, which is used to energize the graphene heating film when the second refrigerant circulation loop is in operation.

[0017] In one possible implementation, the switching component includes a three-way solenoid valve.

[0018] In one possible implementation, the switching assembly includes an electric ball valve and a check valve.

[0019] In one possible implementation, the first sensor includes a capacitive sensor or an infrared reflective sensor;

[0020] The second sensor includes a contact temperature sensor.

[0021] This utility model also provides a refrigeration device, including the refrigeration system described in any one of the preceding claims, wherein the refrigeration system includes a control module;

[0022] The refrigeration equipment also includes a refrigeration damper, and the control module is used to control the opening and closing of the refrigeration damper.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This solution achieves efficient and energy-saving defrosting through dynamic control of hot gas bypass, while ensuring stable internal temperature. Because this solution replaces the heater with a heating element, it saves over 30% more energy compared to traditional solutions; a mechanical pressure regulating valve is used as redundant protection to avoid the risk of overpressure in the refrigeration system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is one of the structural schematic diagrams of the refrigeration system provided in this embodiment;

[0027] Figure 2 This is a schematic diagram of the switching component provided in this embodiment;

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

[0029] Icons: Refrigeration system - 10; Compressor - 11; Switching component - 12; Connecting component - 13; First interface - 121; Second interface - 122; Third interface - 123; Condenser - 110; Evaporator - 120; Pressure regulating valve - 210; Heating element - 220; Drain pipe - 230; First refrigerant circulation loop - 100; Second refrigerant circulation loop - 200. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only used for the convenience of describing this utility model 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 this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The inventors' investigation revealed that current defrosting technology for refrigeration equipment mainly relies on electric heaters, such as quartz tubes and aluminum foil heaters. The heaters are controlled to start and stop at fixed time intervals or temperature thresholds. However, this approach has the following drawbacks: the defrosting heaters have high power, and frequent start-stop cycles lead to high power consumption during defrosting, especially in high humidity environments; forced defrosting can cause the refrigerator compartment temperature to rise by 3-5°C, affecting food preservation; the heating elements are exposed to high temperature and humidity for extended periods, which may cause aluminum foil breakdown, quartz tube bursting, or circuit aging, posing risks of leakage and fire; traditional time / temperature threshold control cannot dynamically adapt to changes in frost thickness, resulting in ineffective heating—running at full power when the frost layer is thin or incomplete defrosting—and insufficient heating time when the frost layer is too thick.

[0037] In view of this, please refer to Figure 1This utility model provides a refrigeration system 10, including a compressor 11, a switching component 12, a condenser 110, an evaporator 120, a pressure regulating valve 210, a heating element 220, and a drain pipe 230.

[0038] Please refer to Figure 2 The switching component 12 includes a first interface 121, a second interface 122 and a third interface 123, wherein the first interface 121 is connected to the compressor 11.

[0039] In this embodiment, the first interface 121 is the inlet, and the second interface 122 and the third interface 123 are the two outlets. The switching component 12 can open or close the second interface 122 and the third interface 123 as needed, allowing or cutting off the flow between them and the first interface 121. Optionally, the switching component 12 can be a three-way electrically operated switching valve.

[0040] The condenser 110 is connected to the second interface 122 of the switching component 12 and the evaporator 120 respectively. The compressor 11, the switching component 12, the condenser 110 and the evaporator 120 are connected in sequence to form a first refrigerant circulation loop 100.

[0041] In the refrigeration system 10, the compressor 11, condenser 110 and evaporator 120 work together to transfer heat through the phase change cycle of the refrigerant, thereby achieving temperature control of the refrigeration equipment.

[0042] For example, when using a refrigeration device with the refrigeration system 10 provided in this embodiment, the compressor 11 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gas and delivers it to the condenser 110; the condenser 110 condenses the high-temperature refrigerant into a medium-temperature, high-pressure liquid through heat dissipation, releasing heat to the external environment; the high-pressure liquid refrigerant enters the evaporator 120 after being depressurized by a throttling device, where it absorbs heat and vaporizes under low pressure, absorbing heat from the surrounding environment, such as the heat from the cold storage compartment, thereby achieving a refrigeration effect; finally, the low-temperature, low-pressure gaseous refrigerant returns to the compressor 11, completing the refrigeration cycle.

[0043] The pressure regulating valve 210 is connected to the third interface 123 of the switching assembly 12 and the heating tube 220 respectively. The compressor 11, the switching assembly 12, the pressure regulating valve 210, the heating tube 220 and the drain pipe 230 are connected in sequence to form a second refrigerant flow circuit 200. The pressure regulating valve 210 is connected to the exhaust port of the compressor 11 via the switching assembly 12.

[0044] In this embodiment, in order to defrost the frost layer on the evaporator 120, a second refrigerant circulation loop 200 is provided in addition to the first refrigerant circulation loop 100.

[0045] For example, when using a refrigeration device with the refrigeration system 10 provided in this embodiment, after the defrosting program is triggered, the refrigeration operation of the compressor 11 stops, and the defrosting program is started. The compressor 11 compresses the refrigerant into a high-temperature, high-pressure gas, and controls the pressure through the pressure regulating valve 210 via the switching component 12, and then inputs it into the heating tube 220. The heating tube 220 is located below the evaporator 120, and heat is conducted to the refrigeration device through the high-temperature refrigerant inside the heating tube 220 to defrost the evaporator 120. After heat exchange in the heating tube 220, the refrigerant will liquefy due to heat release. Therefore, the second refrigerant circulation loop 200 is also provided with a drain pipe 230 after the heating tube 220. A heating device can be added inside the drain pipe 230 to heat and vaporize the refrigerant, preventing liquid refrigerant from entering the compressor 11. Finally, the refrigerant returns to the compressor 11, and the frost layer on the evaporator 120 is defrosted through this cycle.

[0046] The second interface 122 and the third interface 123 of the switching component 12 are not simultaneously open; the switching component 12 is used to control the opening and closing of the first refrigerant circulation loop 100 and the second refrigerant circulation loop 200.

[0047] In this embodiment, the first refrigerant circulation circuit 100 and the second refrigerant circulation circuit 200 are respectively a refrigeration circuit and a defrosting circuit. When the second refrigerant circulation circuit 200 is performing a defrosting operation, the first refrigerant circulation circuit 100 should be closed. Therefore, the switching component 12 is used to control the on / off state of the first refrigerant circulation circuit 100 and the second refrigerant circulation circuit 200.

[0048] In the refrigeration system 10, the electric heater directly consumes electrical energy to convert it into heat, resulting in high energy consumption and low efficiency. The electric heater needs to gradually heat up from a low temperature, typically requiring 20-30 minutes to defrost, which easily leads to large temperature fluctuations in the refrigerator compartments, affecting the cooling effect. Furthermore, the heating element of the electric heater is prone to aging and breakage, and there is a risk of insulation failure in humid environments. Therefore, in this embodiment, a hot gas bypass technology is selected for defrosting. The hot gas bypass technology utilizes the waste heat of the high-temperature refrigerant discharged from the compressor 11 outlet for defrosting, requiring almost no additional energy consumption. In this embodiment, the heating element 220 directly contacts the fins or pipes of the evaporator 120, resulting in high heat transfer efficiency and shortening the defrosting time. In addition, the hot gas bypass system only requires valve switching, has no additional electrical components, and has a longer lifespan. Experiments by the inventors have shown that using the hot gas bypass technology with the heating element 220 to defrost the frost layer on the evaporator 120 can save more than 30% of energy.

[0049] Furthermore, in the second refrigerant flow loop 200 provided in this embodiment, a mechanical pressure regulating valve 210 is also used to protect the second refrigerant flow loop 200 and reduce the risk of overpressure in the refrigeration system 10. Through the coordinated control of the switching component 12 and the pressure regulating valve 210, precise adjustment of the refrigerant flow in the second refrigerant flow loop 200 can be achieved.

[0050] In one possible implementation, please refer to Figure 3 The refrigeration system 10 also includes a connecting component 13.

[0051] The connecting component 13 includes a fourth interface, a fifth interface, and a sixth interface. The fourth interface is connected to the compressor 11, the fifth interface is connected to the evaporator 120, and the sixth interface is connected to the drain pipe 230. All three interfaces are open to flow.

[0052] In this embodiment, the connecting component 13 is connected to the end of the hot gas bypass pipe and the suction port of the compressor 11, so that the refrigerant in the first refrigerant circulation loop 100 and the second refrigerant circulation loop 200 can be combined and fed into the compressor 11. Therefore, the fourth, fifth and sixth interfaces must always be in a flowing state.

[0053] Optionally, the connecting component 13 can be a three-way valve. The three-way valve can stabilize the suction pressure of the compressor 11 and prevent shutdown due to excessively low pressure at low loads. In addition, the three-way valve is a manual valve and is not controlled by the control module in the refrigeration system 10, thus reducing energy consumption and having a longer service life.

[0054] In one possible implementation, the refrigeration system 10 further includes a first sensor and a second sensor. The first sensor is used to detect the thickness of the frost layer, and the second sensor is used to detect the temperature of the evaporator 120.

[0055] In the refrigeration system 10, the frost formation occurs on the surface of the evaporator 120. When the first refrigerant flow loop 100 of the refrigeration system 10 flows, low-temperature, low-pressure liquid refrigerant flows within the evaporator 120. As the liquid refrigerant flows through the evaporator 120, it absorbs heat from the surrounding air or the object being cooled, causing the liquid refrigerant to evaporate into low-temperature, low-pressure gaseous refrigerant. The evaporator 120 also has fins located on the surface of its pipes, which increase the contact area between the evaporator 120 and the air. This allows the evaporator 120 of the same volume to exchange heat with more air, thereby improving its heat exchange efficiency. During this process, the temperature change is greatest on the surface of the evaporator 120; therefore, the frost formation occurs on the surface of the evaporator 120.

[0056] The first sensor is located in the fins of the evaporator 120. The first sensor is used to detect the thickness of the frost layer on the evaporator 120, and then transmits a thickness signal to the control module. The control module can control the opening and closing of the second interface 122 and the third interface 123 of the switching component 12 according to this thickness signal, and thus control the on / off of the first refrigerant flow circuit 100 and the second refrigerant flow circuit 200.

[0057] The second sensor is located on the surface of the evaporator 120. The second sensor is used to detect the temperature of the surface of the evaporator 120, and then transmits the surface temperature signal of the evaporator 120 to the control module. The control module can control the opening and closing of the second interface 122 and the third interface 123 of the switching component 12 according to the temperature signal, and thus control the on / off of the first refrigerant flow circuit 100 and the second refrigerant flow circuit 200.

[0058] In one possible implementation, the refrigeration system 10 further includes a control module electrically connected to the first sensor and the second sensor, for receiving the thickness signal from the first sensor and the temperature signal from the second sensor.

[0059] The control module is also electrically connected to the switching component 12, and the control module is also used to control the connection and disconnection of the first interface 121 and the second interface 122 or the third interface 123 according to the thickness signal and the temperature signal.

[0060] In this embodiment, the refrigeration system 10 can control the opening and closing of the second interface 122 and the third interface 123 of the switching component 12 according to the thickness of the frost layer and the temperature of the evaporator 120, thereby controlling the on / off of the first refrigerant circulation loop 100 and the second refrigerant circulation loop 200.

[0061] For example, when using a refrigeration device with the refrigeration system 10 provided in this embodiment, the conditions for starting the defrosting program can be set: the thickness of the frost layer detected by the first sensor is not less than 3 mm or the refrigeration device has been running continuously for 48 hours without defrosting.

[0062] After the conditions for starting the defrosting program are met, the control module controls the switching component 12 to close the second interface 122 and open the third interface 123; that is, to shut down the first refrigerant circulation loop 100 and connect the second refrigerant circulation loop 200, thus starting the defrosting program. After the defrosting program is started, the refrigeration system 10 enters the hot gas injection stage: the compressor 11 compresses the refrigerant into a high-temperature gas, and the pressure of the high-temperature refrigerant discharged from the compressor 11 into the second refrigerant circulation loop 200 is controlled by the pressure regulating valve 210 to be 1.5-2.0 MPa; the heating tube 220 is located below the evaporator 120, and heat is conducted to the refrigeration equipment through the high-temperature refrigerant inside the heating tube 220 to defrost the evaporator 120; the refrigerant after heat exchange in the heating tube 220 will liquefy due to heat release, and the liquefied refrigerant will be discharged through the drain pipe 230 or vaporized under the control of the control module to prevent the liquid refrigerant from entering the compressor 11; finally, the refrigerant returns to the compressor 11, thus completing the defrosting of the frost layer on the evaporator 120 in this cycle.

[0063] The defrosting program can also be terminated under certain conditions: the second sensor detects that the surface temperature of the evaporator 120 is not lower than 15°C for 2 minutes or the defrosting time exceeds 15 minutes. After the conditions for terminating the defrosting program are met, the control module controls the switching component 12 to close the third interface 123 and open the second interface 122; that is, to shut off the second refrigerant circulation loop 200, connect the first refrigerant circulation loop 100, terminate the defrosting program, and restart the compressor 11.

[0064] In one possible implementation, the evaporator 120 includes a hydrophobic nanocoating on its surface.

[0065] In this embodiment, a hydrophobic nano-coating is provided on the surface of the evaporator 120, which can delay frost formation and thus improve defrosting efficiency.

[0066] Furthermore, when using a refrigeration device with the refrigeration system 10 provided in this embodiment, when the control module controls the second refrigerant circulation loop 200 to be connected, the refrigeration device's refrigeration damper can be closed at the same time, so that the defrosting heat is concentrated on the frost layer of the evaporator 120, and the concentrated airflow accelerates defrosting.

[0067] In one possible implementation, the drain pipe 230 includes a graphene heating film; the graphene heating film is connected to the control module, which is used to energize the graphene heating film when the second refrigerant circulation loop 200 is in operation.

[0068] In this embodiment, since the refrigerant will liquefy due to heat release after heat exchange through the heating tube 220, a drain pipe 230 is added. The drain pipe 230 can have a graphene heating film built in it to heat and vaporize the refrigerant, preventing liquid refrigerant from entering the compressor 11 and causing a liquid compressor. A graphene heating film with a power of 5W can be selected to reduce energy consumption while achieving the function.

[0069] Specifically, when using a refrigeration device with the refrigeration system 10 provided in this embodiment, the control module controls the switching component 12 to close the second interface 122 and open the third interface 123, that is, to shut down the first refrigerant circulation loop 100 and connect the second refrigerant circulation loop 200. When the defrosting program is started, the graphene heating film is simultaneously energized to heat and vaporize the refrigerant.

[0070] In one possible implementation, the switching component 12 includes a three-way solenoid valve.

[0071] In this embodiment, the switching component 12 can be a three-way solenoid valve. The three-way solenoid valve integrates the three channels corresponding to the first interface 121, the second interface 122, and the third interface 123 into a smaller valve body structure. Its overall structure is compact, occupies little space, and is more suitable for small refrigeration equipment. When using a refrigeration equipment with the refrigeration system 10 provided in this embodiment, the three-way solenoid valve controls the opening and closing state of the valve by receiving electrical signals from the control module.

[0072] In one possible implementation, the switching component 12 includes an electric ball valve and a check valve.

[0073] In this embodiment, the switching component 12 can be a combination valve of an electric ball valve and a check valve. The check valve has good one-way sealing performance and can prevent refrigerant backflow. The electric ball valve includes a first port 121, a second port 122, and a third port 123, and has a fast switching speed, enabling rapid opening and closing of the valve under the control of the control module. The electric ball valve and check valve have a simple structure, are less prone to failure, and are easy to maintain. The combination valve of the electric ball valve and check valve is more suitable for large-scale refrigeration equipment.

[0074] It should be noted that, in addition to the aforementioned valve types, other electrically operated switching valves can also be selected as the switching component 12 in this embodiment, without specific limitations.

[0075] In one possible implementation, the first sensor includes a capacitive sensor or an infrared reflective sensor.

[0076] In this embodiment, the first sensor can be either a capacitive sensor or an infrared reflective sensor. A capacitive sensor requires complete contact with the surface of the evaporator 120 to avoid damage to the evaporator 120 surface, while also quickly capturing changes in the thickness of the frost layer on the evaporator 120 surface, exhibiting stable performance within the refrigeration equipment. Infrared reflective sensors have a simple structure, are easy to install, have low maintenance costs, and are suitable for environments with moisture. Different types of thickness sensors can be selected as the first sensor as needed.

[0077] The second sensor includes a contact temperature sensor.

[0078] In this embodiment, the second sensor can be a contact temperature sensor. Contact temperature sensors provide stable and reliable measurements, making them suitable for long-term temperature monitoring of the evaporator 120 surface within refrigeration equipment.

[0079] It should be noted that, in addition to the aforementioned sensor types, other types of sensors can also be selected as the first and second sensors in this embodiment, without specific limitations.

[0080] This utility model also provides a refrigeration device, including the refrigeration system 10 described in any one of the preceding claims, the refrigeration system 10 including a control module; the refrigeration device further includes a refrigeration damper, and the control module is used to control the opening and closing of the refrigeration damper.

[0081] In this embodiment, when the control module controls the second refrigerant circulation loop 200 to be connected, it simultaneously controls the closing of the refrigeration damper. This can block the air circulation between the refrigeration equipment's refrigerator compartment and the evaporator 120, allowing the defrosting heat to be concentrated on the frost layer of the evaporator 120, thus improving defrosting efficiency and reducing the risk of heat loss into the refrigerator space, which could cause the refrigerator space temperature to rise. The inventors' experiments have shown that, through the linkage control of the refrigeration damper, the temperature rise in the refrigerator space during defrosting does not exceed 1.5°C.

[0082] Since the refrigeration equipment provided in this embodiment includes the aforementioned refrigeration system 10, the refrigeration equipment in this embodiment has the advantages of the aforementioned refrigeration system 10, such as energy saving and stability.

[0083] In summary, this utility model provides a refrigeration system 10 and refrigeration equipment. The refrigeration system 10 includes a compressor 11, a switching assembly 12, a condenser 110, an evaporator 120, a pressure regulating valve 210, a heating element 220, and a drain pipe 230. The first interface 121 of the switching assembly 12 is connected to the compressor 11. The condenser 110 is connected to the second interface 122 and the evaporator 120 respectively. The compressor 11, the switching assembly 12, the condenser 110, and the evaporator 120 are sequentially connected to form a first refrigerant circulation loop 100. The pressure regulating valve 210 is connected to the third interface 123 and the heating element 220 respectively. The compressor 11, the switching assembly 12, the pressure regulating valve 210, the heating element 220, and the drain pipe 230 are sequentially connected to form a second refrigerant circulation loop 200. This solution achieves efficient and energy-saving defrosting through hot gas bypass dynamic control, while ensuring the stability of the internal temperature. Because this solution replaces the heater with a heating element 220, it saves more than 30% energy compared to the traditional solution; through damper linkage control, the temperature rise of the refrigerator room during defrosting does not exceed 1.5℃; and a mechanical pressure regulating valve 210 is used as redundant protection to avoid the risk of overpressure in the refrigeration system 10.

[0084] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0085] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A refrigeration system characterized by, The refrigeration system comprises a compressor, a switching assembly, a condenser, an evaporator, a pressure regulating valve, a heating pipe and a liquid discharge pipe. The switching assembly comprises a first interface, a second interface and a third interface, the first interface being connected with the compressor. The condenser is connected with the second interface and the evaporator of the switching assembly respectively, and the compressor, the switching assembly, the condenser and the evaporator are sequentially connected to form a first refrigerant circulation loop. The pressure regulating valve is connected with the third interface of the switching assembly and the heating pipe respectively, and the compressor, the switching assembly, the pressure regulating valve, the heating pipe and the liquid discharge pipe are sequentially connected to form a second refrigerant circulation loop; wherein the pressure regulating valve is connected to the exhaust port of the compressor through the switching assembly. The second interface and the third interface of the switching assembly are not circulated at the same time; the switching assembly is used for controlling the on-off of the first refrigerant circulation loop and the second refrigerant circulation loop.

2. The refrigeration system of claim 1, wherein, The refrigeration system further comprises a communication assembly. The communication assembly comprises a fourth interface, a fifth interface and a sixth interface, the fourth interface being connected with the compressor, the fifth interface being connected with the evaporator, and the sixth interface being connected with the liquid discharge pipe, and the fourth interface, the fifth interface and the sixth interface are all circulated.

3. The refrigeration system of claim 1, wherein, The refrigeration system further comprises a first sensor and a second sensor. The first sensor is located in the fin of the evaporator. The second sensor is located on the surface of the evaporator.

4. The refrigeration system of claim 3, wherein, The refrigeration system further comprises a control module, the control module being electrically connected with the first sensor and the second sensor, and being used for receiving the thickness signal of the first sensor and the temperature signal of the second sensor. The control module is also electrically connected with the switching assembly, and the control module is also used for controlling the on-off of the first interface and the second interface or the third interface according to the thickness signal and the temperature signal.

5. The refrigeration system of claim 1, wherein, The evaporator comprises a hydrophobic nano coating on its surface.

6. The refrigeration system of claim 4 wherein, The liquid discharge pipe comprises a graphene heating film; the graphene heating film is connected with the control module, and the control module is used for electrifying the graphene heating film when the second refrigerant circulation loop circulates.

7. The refrigeration system of claim 1 wherein, The switching assembly comprises a three-way electromagnetic valve.

8. The refrigeration system of claim 1, wherein, The switching assembly comprises an electric ball valve and a one-way valve.

9. The refrigeration system of claim 3 wherein, The first sensor comprises a capacitive sensor or an infrared reflective sensor. The second sensor comprises a contact temperature sensor.

10. A refrigeration appliance characterized in that, The refrigeration system comprises the refrigeration system of any one of claims 1-9, and the refrigeration system comprises a control module. The refrigeration device further comprises a refrigeration air door, and the control module is used for controlling the opening and closing of the refrigeration air door.

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