Defrost systems, refrigeration equipment and air coolers

Abstract

The present application relates to a defrosting system, refrigeration equipment and air cooler. The defrosting system includes: a compressor, an evaporator, a throttling device, a condenser and a cold storage device. The compressor, evaporator, throttling device and condenser are connected in a circular manner to form a refrigerant circuit. The cold storage device is arranged close to the evaporator and connected in parallel with the evaporator between the throttling device and the compressor; when the evaporator is refrigerating, the cold storage device is connected with the throttling device and the compressor, and stores the cold of the low-temperature refrigerant flowing through itself; when the evaporator is defrosted, the cold storage device uses its own stored cold to neutralize the heat emitted by the evaporator. Compared with the prior art, the present application is conducive to maintaining the stability of the cold storage temperature and helps to ensure the storage quality of the goods. Moreover, the cold storage device can circulate and store cold and release cold to neutralize heat, and there is no need to manually replace the new cold storage device after defrosting, which improves the defrosting automation and defrosting efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a defrosting system, refrigeration equipment and a cold air blower. Background Art

[0002] In cold storage, cold chain transportation and other industries, due to the low refrigeration environment temperature requirements, frost is easy to form on the heat exchanger fins of the air cooler in the refrigeration equipment. Frost on the fins will affect the air flow, resulting in reduced heat exchange efficiency of the heat exchanger and failure to achieve the desired refrigeration effect. Therefore, the heat exchanger in the air cooler will be defrosted regularly. Since most air coolers adopt an open structure, during the defrosting process, the heat emitted from the heat exchanger during the defrosting process will be dissipated into the refrigeration equipment, causing the storage temperature of the refrigeration equipment to rise, resulting in large fluctuations in storage temperature, and storage temperature fluctuations will affect the storage quality of goods (such as medicines, vaccines, etc.). Summary of the invention

[0003] In order to solve the problem of large fluctuations in storage temperature during defrosting in existing refrigeration equipment, the present application proposes a defrost system, refrigeration equipment and air cooler. The defrost system, refrigeration equipment and air cooler have the technical effect of reducing the degree of fluctuation in storage temperature during defrosting.

[0004] A defrosting system comprises a compressor, an evaporator, a throttling device, a condenser and a cold storage device, wherein the compressor, the evaporator, the throttling device and the condenser are connected in a circular manner to form a refrigerant circuit;

[0005] The cold storage device is arranged close to the evaporator and connected in parallel with the evaporator between the throttling device and the compressor;

[0006] When the evaporator is cooling, the cold storage device is connected to the throttling device and the compressor, and stores the cold energy of the low-temperature refrigerant flowing through itself; when the evaporator is defrosting, the cold storage device uses its own stored cold energy to neutralize the heat dissipated from the evaporator.

[0007] In one of the embodiments, the evaporator is constructed to be defrosted using a high-temperature refrigerant flowing through the evaporator. When the evaporator is defrosted, the cold storage device is not connected to the throttling device and the compressor.

[0008] In one embodiment, the cold storage device includes a cold storage heat exchanger and a cold storage agent. The cold storage heat exchanger is connected in parallel with the evaporator between the throttling device and the compressor for allowing the low-temperature refrigerant to circulate. The cold storage agent is used to store the cold energy dissipated by the low-temperature refrigerant through the cold storage heat exchanger.

[0009] In one embodiment, a first cold storage control valve is connected between the cold storage heat exchanger and the compressor, and the first cold storage control valve is used to only allow the refrigerant to flow from the cold storage heat exchanger to the compressor;

[0010] A second cold storage control valve is connected between the cold storage heat exchanger and the throttling device. The second cold storage control valve is used to connect the cold storage heat exchanger and the throttling device when the evaporator is cooling, and is used to disconnect the cold storage heat exchanger and the throttling device when the evaporator is defrosting.

[0011] In one of the embodiments, the cold storage device also includes a first temperature sensing bag for measuring the temperature of the cold storage agent; when the temperature value detected by the first temperature sensing bag reaches a first threshold value, the second cold storage control valve disconnects the cold storage heat exchanger and the throttling device.

[0012] In one embodiment, it also includes a casing, the casing having a first cavity, a second cavity and a conducting portion, the conducting portion is used to conduct the first cavity and the second cavity, the evaporator is located in the first cavity, the cold storage device is located in the second cavity, and the conducting portion is connected to the top of the evaporator.

[0013] In one embodiment, the conducting portion is configured to controllably conduct or disconnect the first cavity and the second cavity;

[0014] When the evaporator is cooling, the conducting part disconnects the first cavity and the second cavity; when the evaporator is defrosting, the conducting part connects the first cavity and the second cavity.

[0015] In one of the embodiments, the conduction portion includes a temperature-isolating cavity, which separates the housing into the first cavity and the second cavity, and the temperature-isolating cavity is controlled to be simultaneously conducted or simultaneously disconnected with the first cavity and the second cavity.

[0016] In one embodiment, a heat storage device is further included, wherein the heat storage device includes a heat storage tank and a heat storage pipeline and a heat release pipeline for circulating a heat storage agent;

[0017] The heat storage tank comprises a heat storage outlet, a heat storage inlet, a heat release outlet and a heat release inlet, the heat storage pipeline is arranged around the compressor, and forms a heat storage loop with the heat storage tank through the heat storage outlet and the heat storage inlet, the heat release pipeline passes through the inside of the evaporator, and forms a heat release loop with the heat storage tank through the heat release outlet and the heat release inlet;

[0018] The heat storage circuit and the heat release circuit are not connected at the same time.

[0019] In one embodiment, a recovery tank, a first heat release valve and a recovery valve are provided on the heat release circuit, the recovery tank is located between the evaporator and the heat release inlet, the first heat release valve is connected to the heat release pipeline between the heat release outlet and the evaporator, and the recovery valve is connected to the heat release pipeline between the recovery tank and the heat release inlet;

[0020] The first heat-releasing valve and the recovery valve do not conduct the heat-releasing pipeline at the same time.

[0021] In one of the embodiments, a second heat release valve is further provided on the heat release circuit, and the second heat release valve is connected to the heat release pipeline between the evaporator and the recovery tank.

[0022] In one of the embodiments, a first heat storage valve and a second heat storage valve are provided on the heat storage circuit, the first heat storage valve is connected to the heat storage pipeline between the compressor and the heat storage inlet, and the second heat storage valve is connected to the heat storage pipeline between the compressor and the heat storage outlet.

[0023] In one embodiment, the heat storage device further comprises a heat storage heat exchanger, the heat storage heat exchanger is located in the heat storage tank, and the heat storage heat exchanger is connected in parallel with the condenser between the compressor and the throttling device;

[0024] When the evaporator is cooling, the heat storage heat exchanger is connected to the compressor and the throttling device, and is used to circulate the high-temperature refrigerant flowing out of the compressor to heat the heat storage agent in the heat storage tank.

[0025] In one of the embodiments, the evaporator is constructed to be defrosted using a high-temperature refrigerant flowing through the evaporator; when the evaporator is defrosted, the heat storage heat exchanger is not connected to the throttling device and the compressor.

[0026] In one of the embodiments, a first heat storage control valve is connected between the heat storage heat exchanger and the throttling device, and the first heat storage control valve is used to connect the compressor and the heat storage heat exchanger when the evaporator is refrigerated, and disconnect the compressor and the heat storage heat exchanger when the evaporator is defrosted;

[0027] A second heat storage control valve is connected between the compressor and the heat storage heat exchanger, and the second heat storage control valve is used to only allow the refrigerant to flow from the heat storage heat exchanger to the throttling device.

[0028] In one of the embodiments, the cold storage device is connected in parallel with the evaporator between the throttling device and the compressor. When the evaporator is cooling, the cold storage device is connected to the throttling device and the compressor, and stores the cold energy of the low-temperature refrigerant flowing through itself. When the cold energy stored in the cold storage device reaches a cold energy threshold, the first heat storage control valve disconnects the compressor and the heat storage heat exchanger.

[0029] In one of the embodiments, a second temperature sensing bag is arranged in the heat storage tank, and a third temperature sensing bag is arranged in the heat storage pipeline wound around the compressor. When the difference between the temperature value detected by the third temperature sensing bag and the temperature value detected by the second temperature sensing bag does not exceed a second threshold value, the heat storage circuit and the heat release circuit are both disconnected.

[0030] In one embodiment, the cold storage device is wrapped with a first thermal insulation layer, and / or the heat storage device is wrapped with a second thermal insulation layer.

[0031] In addition, an embodiment of the present application further provides a refrigeration device, including a storage body and the defrost system provided in any of the above embodiments, wherein the evaporator and the cold storage device are located in the storage body.

[0032] In addition, an embodiment of the present application further provides a cooling fan, including:

[0033] A housing having a first cavity, a second cavity and a conducting portion, wherein the conducting portion is used to conduct the first cavity and the second cavity;

[0034] An evaporator is located in the first cavity, and the conducting portion is connected to the top of the evaporator; and

[0035] A cold storage device is located in the second cavity, and the cold storage device and the evaporator are configured to be connected in parallel between the throttling device and the compressor;

[0036] When the evaporator is cooling, the cold storage device is connected to the throttling device and the compressor, and stores the cold energy of the low-temperature refrigerant flowing through itself; when the evaporator is defrosting, the cold storage device uses its own stored cold energy to neutralize the heat dissipated from the evaporator.

[0037] In one embodiment, the conducting portion is configured to controllably conduct or disconnect the first cavity and the second cavity;

[0038] When the evaporator is cooling, the conducting part disconnects the first cavity and the second cavity. When the evaporator is defrosting, the conducting part connects the first cavity and the second cavity.

[0039] In one embodiment, the evaporator is constructed to defrost using high-temperature refrigerant flowing through it; when the evaporator is defrosted, the cold storage device is not connected to the throttling device and the compressor, and uses its own stored cold to neutralize the heat dissipated through the evaporator.

[0040] The above-mentioned defrosting system arranges a cold storage device near the evaporator and is connected in parallel with the throttling device and the compressor. The cold storage device can circulate refrigerant and store cold energy in the refrigeration mode, and can also use the cold energy stored in the refrigeration mode to absorb and neutralize the heat emitted by the evaporator during defrosting in the defrosting mode, so as to avoid heat being emitted to the cold storage and causing fluctuations in the storage temperature. This is conducive to maintaining the stability of the cold storage temperature and helps to ensure the storage quality of the goods. Moreover, the cold storage device can circulate and store cold energy and release cold energy to neutralize heat, and there is no need to manually replace a new cold storage device after defrosting, thereby improving the defrosting automation and defrosting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a first schematic diagram of a defrosting system in a refrigeration mode in an embodiment of the present application;

[0042] Figure 2 for Figure 1 A second schematic diagram of the defrost system in refrigeration mode is shown;

[0043] Figure 3 for Figure 1 A schematic diagram of a defrost system in defrost mode is shown;

[0044] Figure 4 for Figure 3 The schematic diagram of the defrost system in the transition state is shown;

[0045] Figure 5 Schematic diagram of the structure of the cooling fan in one embodiment of the present application.

[0046] Description of reference numerals:

[0047] Compressor 10; throttling device 20; condenser 30; air cooler 40; evaporator 41; cold storage device 42; cold storage heat exchanger 421; first temperature sensing package 422; housing 43; conduction part 431; temperature insulation chamber 4311; heat storage device 50; heat storage tank 501; heat storage pipeline 502; first heat storage valve 503; second heat storage valve 504;

[0048] Heat release pipeline 505; first heat release valve 506; second heat release valve 507; recovery valve 508; recovery tank 509;

[0049] Heat storage heat exchanger 510; second temperature sensing package 511; third temperature sensing package 512; first cold storage control valve 61;

[0050] The second cold storage control valve 62 ; the first heat storage control valve 63 ; the second heat storage control valve 64 ; and the reversing valve 65 . DETAILED DESCRIPTION

[0051] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0052] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0057] See also Figure 1 , Figure 2 and Figure 3 In one embodiment of the present application, a defrosting system is provided, comprising a compressor 10, an evaporator 41, a throttling device 20, a condenser 30 and a cold storage device 42. The compressor 10, the evaporator 41, the throttling device 20 and the condenser 30 are connected in a circular manner to form a refrigerant circuit. The cold storage device 42 is configured to store cold energy. The cold storage device 42 is arranged close to the evaporator 41 and connected in parallel with the evaporator 41 between the throttling device 20 and the compressor 10. When the evaporator 41 is cooling, the cold storage device 42 is connected to the throttling device 20 and the compressor 10, and stores the cold energy of the low-temperature refrigerant flowing through itself. When the evaporator 41 is defrosted, the cold storage device 42 uses its own stored cold energy to neutralize the heat emitted from the evaporator 41.

[0058] In the above-mentioned defrosting system, in the refrigeration mode, the high-temperature and high-pressure refrigerant generated by the compressor 10 flows back to the compressor 10 after passing through the condenser 30, the throttling device 20, and the evaporator 41 in sequence. At this time, the evaporator 41 refrigerates the cold storage of the refrigeration equipment. Since the cold storage device 42 is connected with the compressor 10 and the throttling device 20, the low-temperature and low-pressure refrigerant flowing out of the throttling device 20 is divided into two paths, one of which flows through the evaporator 41 to refrigerate the evaporator 41, and the other low-temperature and low-pressure refrigerant flows through the cold storage device 42, so that the cold storage device 42 stores the cold capacity of the low-temperature refrigerant. In the defrosting mode, the evaporator 41 generates heat to melt the frost formed on the fins of the evaporator 41 during refrigeration. At this time, the heat emitted from the evaporator 41 is absorbed by the cold storage device 42 during the natural rising process, and is neutralized by the cold stored in the cold storage device 42 itself, so that the heat cannot be emitted to the cold storage of the refrigeration equipment. In this way, the influence of the heat emitted by the evaporator 41 itself on the cold storage temperature during defrosting can be reduced, thereby reducing the degree of fluctuation of the cold storage temperature during defrosting. Among them, after the cold storage device 42 uses its own stored cold to neutralize the heat emitted by the evaporator 41, its own temperature rises. When the evaporator 41 enters the refrigeration mode again, the cold storage device 42 can reabsorb and store the cold of the low-temperature and low-pressure refrigerant for use during the next defrosting, and the cycle continues.

[0059] Compared with the prior art, by arranging a cold storage device 42 near the evaporator 41 and connecting it in parallel with the throttling device 20 and the compressor 10, the cold storage device 42 can circulate refrigerant and store cold energy in the refrigeration mode, and use the cold energy stored in the refrigeration mode to absorb and neutralize the heat emitted by the evaporator 41 during defrosting in the defrosting mode, so as to avoid heat being emitted into the cold storage and causing fluctuations in the storage temperature, which is conducive to maintaining the stability of the cold storage temperature and helping to ensure the storage quality of the goods. Moreover, the cold storage device 42 can circulate and store cold energy and release cold energy to neutralize heat, and there is no need to manually replace the new cold storage device 42 after defrosting, thereby improving the defrosting automation and defrosting efficiency.

[0060] Preferably, the throttling device 20 is an electronic expansion valve. Of course, an orifice plate structure or the like may also be selected, without limitation.

[0061] Specifically in the embodiment, the evaporator 41 is constructed to be defrosted by using the high-temperature refrigerant flowing through it. When the evaporator 41 is defrosted, the cold storage device 42 is not connected to the throttling device 20 and the compressor 10. At this time, when the evaporator 41 is defrosted, the high-temperature and high-pressure refrigerant generated by the compressor 10 first flows through the evaporator 41 to defrost the evaporator 41. At this time, the cold storage device 42 is disconnected from the throttling device 20 and the compressor 10 to prevent the high-temperature and high-pressure refrigerant from flowing through the cold storage device 42 during defrosting, causing the cold storage device 42 to be unable to neutralize the heat emitted by the evaporator 41 during defrosting.

[0062] At this time, in the defrost mode, in order to make the evaporator 41 flow through the high-temperature refrigerant itself to generate heat for defrosting, the flow direction of the refrigerant in the refrigerant circuit can be changed, so that the high-temperature and high-pressure refrigerant generated by the compressor 10 flows back to the compressor 10 after passing through the evaporator 41, the throttling device 20, and the condenser 30, and the heat generated by the evaporator 41 when the high-temperature and high-pressure refrigerant flows through the evaporator 41 is used to defrost (this process is thermal fluorination defrosting). Specifically, the defrost system also includes a reversing valve 65, and the reversing valve 65 has a first connection state and a second connection state. In the first connection state, the reversing valve 65 connects the inlet of the compressor 10 with the evaporator 41, and connects the outlet of the compressor 10 with the condenser 30, so that the evaporator 41 is refrigerated. In the second connection state, the reversing valve 65 connects the outlet of the compressor 10 with the evaporator 41, and connects the inlet of the compressor 10 with the condenser 30, so that the evaporator 41 is defrosted. Among them, the reversing valve 65 can be a four-way valve. At this time, the flow direction of the refrigerant flowing out of the compressor 10 can be changed by switching the state of the reversing valve 54 to achieve the switching of the evaporator 41 between the cooling mode and the defrosting mode.

[0063] Of course, it is also possible to heat the evaporator 41 to defrost by heating it with an electric auxiliary heating module disposed in the evaporator 41, or to defrost it by flowing hot water through the evaporator 41. The defrosting method of the evaporator 41 is not specifically limited. It is understandable that when the evaporator (41) is not defrosted by the above-mentioned hot fluorine, the compressor 20 stops working (does not output high-temperature and high-pressure refrigerant) when the evaporator (41) is defrosted, and at this time, the cold storage device 42 may be connected to or not connected to the throttling device 20 and the compressor 10.

[0064] Specifically, the cold storage device 42 includes a cold storage heat exchanger 421 and a cold storage agent. The cold storage heat exchanger 421 is connected in parallel with the evaporator 41 between the throttling device 20 and the compressor 10 for circulating the low-temperature refrigerant. The cold storage agent is used to store the cold energy dissipated by the low-temperature refrigerant through the cold storage heat exchanger 421.

[0065] When the evaporator 41 is cooling, the low-temperature and low-pressure refrigerant flowing out of the throttling device 20 is divided into two paths, one path flows through the evaporator 41 and then returns to the compressor 10, and the other path flows through the cold storage heat exchanger 421 and then returns to the compressor 10. When the low-temperature and low-pressure refrigerant flows through the cold storage heat exchanger 421, the cold storage agent is cooled by the cold storage heat exchanger 421, so that the cold storage agent undergoes a positive phase change to store cold energy. When the evaporator 41 is defrosted, the cold storage heat exchanger 421 is not connected to the throttling device 20 and the compressor 10. At this time, the heat emitted by the evaporator 41 is absorbed by the cold storage agent of the cold storage device 42 and is neutralized by the cold energy stored in the cold storage agent. At this time, the cold storage agent undergoes a reverse phase change to prepare for the next cold storage.

[0066] Optionally, the cold storage heat exchanger is a tubular heat exchanger for circulating the refrigerant, and the specific form is not limited. Among them, the cold storage agent is made of phase change cold storage material, which is a functional material for storing cold in the phase change cold storage system. The cold storage and release thereof are performed by the phase change cold storage material, and its physical and chemical properties do not change after undergoing an unlimited number of melting and solidification cycles. The phase change cold storage material is preferably a specific type, which is not limited here, and can be selected from high molecular polymers and water-absorbing resins.

[0067] Further, see Figure 1 , Figure 2 , Figure 3 and Figure 4 A first cold storage control valve 61 is connected between the cold storage heat exchanger 421 and the compressor 10. The first cold storage control valve 61 is used to only allow the refrigerant to flow from the cold storage heat exchanger 421 to the compressor 10. A second cold storage control valve 62 is connected between the cold storage heat exchanger 421 and the throttling device 20. The second cold storage control valve 62 is used to connect the cold storage heat exchanger 421 and the throttling device 20 when the evaporator 41 is cooling, and to disconnect the cold storage heat exchanger 421 and the throttling device 20 when the evaporator 41 is defrosting.

[0068] In actual operation, when the evaporator 41 is cooling, the second cold storage control valve 62 conducts the cold storage heat exchanger 421 and the throttling device 20, and the first cold storage control valve 61 allows the refrigerant to flow from the cold storage heat exchanger 421 to the compressor 10, and the low-temperature and low-pressure refrigerant flowing out of the throttling device 20 flows back to the compressor 10 through the evaporator 41 in one direction and flows back to the compressor 10 through the cold storage heat exchanger 421 in another direction. When the low-temperature and low-pressure refrigerant flows through the cold storage heat exchanger 421, the temperature of the refrigerant is reduced so that the refrigerant phase changes and stores cold. When the evaporator 41 is defrosted, the high-temperature and high-pressure refrigerant generated by the compressor 10 flows through the evaporator 41 to heat and defrost. At this time, the second cold storage control valve 62 disconnects the throttling device 20 and the cold storage heat exchanger 421 to avoid the storage temperature fluctuation caused by the cold storage agent not being enough to neutralize the heat dissipated by the evaporator 41 when the medium-temperature refrigerant flowing out of the evaporator 41 flows to the cold storage heat exchanger 421. At the same time, since the first cold storage control valve 61 does not allow the refrigerant to flow from the compressor 10 to the cold storage heat exchanger 421 , the high-temperature and high-pressure refrigerant flowing out of the compressor 10 cannot enter the cold storage heat exchanger 421 .

[0069] In this way, by setting the first cold storage control valve 61 and the second cold storage control valve 62, it is possible to ensure that the cold storage device 42 can store cold normally, and at the same time, the cold storage device 42 can be fully used to neutralize the heat emitted by the evaporator 41 during defrosting, thereby avoiding storage temperature fluctuations.

[0070] Preferably, the first cold storage control valve 61 is a one-way valve, and the second cold storage control valve 62 is a solenoid valve, which can reduce the control. Of course, the first cold storage control valve 61 and the second cold storage control valve 62 can also be solenoid valves.

[0071] It can be understood that the defrost system also includes a main controller, which is electrically connected to the second cold storage control valve 62. The main controller is used to control the second cold storage control valve 62 to be energized in the refrigeration mode to connect the cold storage heat exchanger 421 and the throttling device 20. The main controller is used to control the second cold storage control valve 62 to be de-energized in the defrost mode to disconnect the cold storage heat exchanger 421 and the throttling device 20.

[0072] Further, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The cold storage device 42 also includes a first temperature sensing package 422 for measuring the temperature of the cold storage agent. When the temperature value detected by the first temperature sensing package 422 reaches a first threshold value, the second cold storage control valve 62 disconnects the cold storage heat exchanger 421 and the throttling device 20.

[0073] In actual operation, when the evaporator 41 starts cooling, the cold storage device 42 starts to store cold energy synchronously. As the cooling time increases, the cold energy stored in the cold storage device 42 reaches a certain level, and the temperature of the cold storage agent in the cold storage device 42 reaches the target temperature. When the temperature value detected by the first temperature sensing package 422 reaches the first threshold value, it means that the temperature of the cold storage agent in the cold storage device 42 reaches the target temperature. At this time, the second cold storage control valve 62 disconnects the cold storage heat exchanger 421 and the throttling device 20, and all the refrigerant flowing out of the throttling device 20 flows through the evaporator 41 for cooling. In this way, it helps to improve the utilization rate of the refrigerant, reduce the refrigeration efficiency of the entire system, and save energy consumption.

[0074] It can be understood that the main controller is electrically connected to the first temperature sensing package 422 and receives the temperature value detected by the first temperature sensing package 422. When the temperature value detected by the first temperature sensing package 422 reaches the first threshold, the main controller controls the second cold storage control valve 62 to be powered off to disconnect the cold storage heat exchanger 421 and the throttling device 20. It can be understood that the first threshold is less than zero.

[0075] In some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The defrost system also includes a casing 43, which has a first cavity, a second cavity and a conducting portion 431, wherein the conducting portion 431 is used to conduct the first cavity and the second cavity, the evaporator 41 is located in the first cavity, the cold storage device 42 is located in the second cavity, and the conducting portion 431 is connected to the top of the evaporator 41.

[0076] In actual operation, the hot air generated when the evaporator 41 is defrosted is guided to the second cavity through the conductive part 431 connected to the top of the evaporator 41 during the natural rise process, and is absorbed and neutralized by the cold storage device 42 in the second cavity. At this time, through the setting of the casing 43, the heat dissipated by the evaporator 41 can be completely contained in the casing 43, and under the guidance of the conductive part 431, the heat can all enter the second cavity and then be absorbed by the cold storage device 42, which can prevent the heat from being dissipated into the cold storage and causing the storage temperature to fluctuate.

[0077] It can be understood that the housing 43 also has an air outlet connecting the first cavity and the outside of the housing 43, and the air outlet is located below the evaporator 41. In this way, the cold air generated by the evaporator 41 during refrigeration enters the cold storage of the refrigeration device through the air outlet.

[0078] It should be noted that, in other embodiments, the cold storage device 42 may be manufactured into a shape arranged around the evaporator 41 to improve the absorption of heat emitted by the evaporator 41 .

[0079] Specifically in the embodiment, see Figure 5 The conducting part 431 is configured to controllably conduct or disconnect the first cavity and the second cavity. When the evaporator 41 is cooling, the conducting part 431 disconnects the first cavity and the second cavity. When the evaporator 41 is defrosting, the conducting part 431 connects the first cavity and the second cavity.

[0080] In actual operation, the first cavity is connected to the cold storage, and the second cavity is not connected to the cold storage. When the evaporator 41 is cooling, the cold energy emitted by the evaporator 41 enters the cold storage through the first cavity to reduce the temperature of the cold storage. At this time, the first cavity and the second cavity are not connected. In this way, it can be avoided that the cold energy emitted by the evaporator 41 enters the second cavity and causes the cold storage device 42 to be overcooled or the temperature is not enough. When the evaporator 41 is defrosted, the conductive part 431 connects the first cavity and the second cavity. The heat dissipated by the evaporator 41 can enter the second cavity through the first cavity during the natural rising process, so as to be absorbed and neutralized by the cold storage device 42. In this way, it is convenient to accurately control the temperature of the cold storage device 42, avoid overcooling of the cold storage device 42, and also help to improve the refrigeration effect of the evaporator 41.

[0081] Furthermore, the second cavity is located above the first cavity. In this case, the conduction portion 431 may be only a straight flow channel such as a conduction hole, which helps to reduce the length of the guide path of the conduction portion 431 and simplify the structure of the entire system. Of course, in other embodiments, the second cavity may also be located in other positions of the first cavity, and the conduction portion 431 can guide the naturally rising heat dissipated by the evaporator 41 to the second cavity, and be absorbed and neutralized by the cold storage device 42 in the second cavity, but the structure of the conduction portion 431 at this time is more complicated, and may be a curved pipe, etc. For example, when the second cavity and the first cavity are located in the same horizontal plane, the heat is guided from the top of the first cavity to the bottom of the second cavity through the conduction portion 431.

[0082] Further, see Figure 5 The conducting portion 431 includes a temperature-isolating cavity 4311, which separates the housing 43 into a first cavity and a second cavity. The temperature-isolating cavity 4311 is controlled to be simultaneously connected to or disconnected from the first cavity and the second cavity.

[0083] At this time, when the evaporator 41 is cooling, the temperature-insulating cavity 4311 is controlled to be disconnected from the first cavity and the second cavity at the same time, which serves to isolate the mutual transfer of temperature between the first cavity and the second cavity, avoid the cold storage device 42 from being overcooled or having insufficient temperature, and also help to improve the cooling effect of the evaporator 41. When the evaporator 41 is defrosting, the temperature-insulating cavity 4311 is connected to the first cavity and the second cavity at the same time, so that the heat in the first cavity can enter the second cavity after passing through the temperature-insulating cavity 4311.

[0084] Furthermore, the projected area of ​​the insulation cavity 4311 on the top of the evaporator 41 is equivalent to the area of ​​the top of the evaporator 41. At this time, since the heat generated by the evaporator 41 during defrosting is dissipated from the top of the evaporator 41, the conductive insulation cavity 4311 can quickly guide the heat to the second cavity.

[0085] In some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The defrosting system further includes a heat storage device 50, which includes a heat storage tank 501 and a heat storage pipeline 502 and a heat release pipeline 505 for circulating a heat storage agent. The heat storage tank 501 includes a heat storage outlet, a heat storage inlet, a heat release outlet and a heat release inlet. The heat storage pipeline 502 is wound around the compressor 10, and forms a heat storage circuit with the heat storage tank 501 through the heat storage outlet and the heat storage inlet. The heat release pipeline 505 passes through the inside of the evaporator 41, and forms a heat release circuit with the heat storage tank 501 through the heat release outlet and the heat release inlet. The heat storage circuit and the heat release circuit are not connected at the same time.

[0086] In actual operation, the compressor 10 will emit waste heat when working. In the cooling mode, the heat storage circuit is turned on and the heat release circuit is turned off. The heat storage pipeline 502 is wound around the compressor 10, and the heat storage agent flows out through the heat storage tank 501 and flows back to the heat storage tank 501 through the heat storage circuit. When passing through the heat storage pipeline 502 wound around the compressor 10, it can absorb the waste heat of the compressor 10 to store heat. In the defrosting mode, the heat storage circuit is turned off and the heat release circuit is turned on. The heat storage agent (which has absorbed heat) stored in the heat storage tank 501 enters the evaporator 41 through the heat release circuit, and the stored heat is used to heat the evaporator 41 to assist the evaporator 41 in defrosting. In this way, the waste heat generated by the compressor 10 when working can be used to provide heat for the evaporator 41 to defrost, which helps to save energy and speed up the defrosting efficiency.

[0087] The heat storage agent is a functional material with a certain fluidity that can absorb and store heat. The heat storage agent can be made of a phase change heat storage material, which uses the phase change heat generated by the phase change process (such as solidification / melting, condensation / vaporization, solidification / sublimation, etc.) of the material to store and utilize heat. The specific type of heat storage agent is not limited here.

[0088] Furthermore, the heat storage device 50 also includes a heat storage pump, which is arranged in the heat storage tank 501 and is used to provide power for the heat storage agent to flow in the heat storage circuit and the heat release circuit. This helps to speed up the flow speed of the heat storage agent in the heat storage circuit and the heat release circuit, and improve the heat storage efficiency and defrosting efficiency. The heat storage pump can be a hydraulic pump.

[0089] Specifically in the embodiment, a recovery tank 509, a first heat release valve 506 and a recovery valve 508 are provided on the heat release circuit. The recovery valve 508 is located between the evaporator 41 and the heat release inlet. The first heat release valve 506 is connected to the heat release pipeline 505 between the heat release outlet and the evaporator 41. The recovery valve 508 is connected to the heat release pipeline 505 between the recovery tank 509 and the heat release inlet. The first heat release valve 506 and the recovery valve 508 do not conduct the heat release pipeline 505 at the same time.

[0090] In actual operation, in the cooling mode, the first heat release valve 506 and the recovery valve 508 are both closed to disconnect the heat release circuit, so that the heat storage agent in the heat storage tank 501 cannot enter the heat release circuit. In the defrosting mode, the heat storage circuit is cut off, the first heat release valve 506 is opened and the recovery valve 508 is closed, and the heat storage agent flows out of the heat storage tank 501 through the heat release outlet and flows through the inside of the evaporator 41, and then is stored in the recovery tank 509. At this time, the heat storage agent does not circulate in the heat release circuit during defrosting, which can prevent the heat storage agent flowing through the evaporator 41 and the heat storage agent that does not flow through the evaporator 41 from mixing in the heat storage tank 501, causing the overall heat utilization efficiency of the heat storage agent to decrease, which helps to improve the defrosting efficiency.

[0091] When defrosting is completed, the entire system re-enters the refrigeration mode. At this time, the heat storage circuit is connected, the first heat release valve 506 is closed and the recovery valve 508 is opened. The heat storage agent in the recovery tank 509 flows back to the heat storage tank 501 through the recovery valve 508 and the heat release inlet, and enters the heat storage circuit to absorb the waste heat generated by the compressor 10 again, and the cycle continues.

[0092] It should be noted that a liquid level monitoring device is provided in the recovery tank 509, and the liquid level monitoring device is used to monitor the liquid level height of the heat storage agent in the recovery tank 509. When the liquid level monitoring device detects that the liquid level height in the recovery tank 509 is lower than the height threshold, the recovery valve 508 is closed. In this way, it is possible to prevent the heat storage agent from flowing back into the recovery tank 509 during the heat storage stage and failing to store heat normally. Among them, the liquid level monitoring device can be a liquid level meter, such as an ultrasonic liquid level meter.

[0093] Further, see Figure 1 , Figure 2 , Figure 3 and Figure 4 A second heat release valve 507 is also provided on the heat release circuit. The second heat release valve 507 is connected to the heat release pipeline 505 between the evaporator 41 and the recovery tank 509 .

[0094] In actual operation, when entering the defrosting mode, the second heat release valve 507 and the first heat release valve 506 are both opened, so that the heat storage agent flows from the heat storage tank 501 to the recovery tank 509. When switching from the defrosting mode to the cooling mode, the second heat release valve 507 and the first heat release valve 506 are both closed, so that in the initial stage of the cooling mode, the heat storage agent in the recovery tank 509 can be prevented from flowing back to the evaporator 41 and reducing the cooling efficiency of the evaporator 41.

[0095] Specifically in the embodiment, a first heat storage valve 503 and a second heat storage valve 504 are provided on the heat storage circuit. The first heat storage valve 503 is connected to the heat storage pipeline 502 between the compressor 10 and the heat storage inlet, and the second heat storage valve 504 is connected to the heat storage pipeline 502 between the compressor 10 and the heat storage outlet.

[0096] In actual operation, when entering the cooling mode, the first heat storage valve 503 and the second heat storage valve 504 are both opened (and the heat release circuit is closed), the heat storage circuit is conducted, and the heat storage agent absorbs the waste heat generated by the compressor 10 when flowing in the heat storage circuit. When entering the defrosting mode, the first heat storage valve 503 and the second heat storage valve 504 are both closed (the heat release circuit is conducted), and the heat storage agent can heat the evaporator 41 through the heat release circuit to assist the evaporator 41 in defrosting.

[0097] In some embodiments, see Figure 1 , Figure 2 , Figure 3 and Figure 4The heat storage device 50 further includes a heat storage heat exchanger 510, which is located in the heat storage tank 501. The heat storage heat exchanger 510 and the condenser 30 are connected in parallel between the compressor 10 and the throttling device 20. When the evaporator 41 is cooling, the heat storage heat exchanger 510 is connected to the compressor 10 and the throttling device 20 to circulate the high-temperature refrigerant flowing out of the compressor 10 to heat the heat storage agent in the heat storage tank 501.

[0098] In actual operation, in the cooling mode, the heat storage heat exchanger 510 is connected to the compressor 10 and the throttling device 20, and the high-temperature and high-pressure refrigerant flowing out of the compressor 10 is divided into two paths, one path is cooled after releasing heat through the condenser 30, and the other path is cooled after releasing heat through the heat storage heat exchanger 510. When the high-temperature and high-pressure refrigerant releases heat through the heat storage heat exchanger 510, it can heat the heat storage agent in the heat storage tank 501. In this way, the heat storage speed of the heat storage agent can be accelerated. Among them, the heat storage heat exchanger 510 can be a tubular heat exchanger, a plate heat exchanger or a fin heat exchanger, without specific limitation.

[0099] Specifically in the embodiment, the evaporator 41 is constructed to be defrosted using the high-temperature refrigerant flowing through it. When the evaporator 41 is defrosted, the heat storage heat exchanger 510 is not connected to the throttling device 20 and the compressor 10.

[0100] At this time, when the evaporator 41 is in the defrost mode, the heat storage heat exchanger 510 is not connected to the throttling device 20 and the compressor 10, because at this time the heat storage agent in the heat storage tank 501 gradually flows to the recovery tank 509, and after the refrigerant comes out of the evaporator 41, it flows back to the compressor 10 through the throttling device 20 and the condenser 30. The temperature of the refrigerant flowing out of the throttling device 20 is not high. If it continues to pass through the heat storage heat exchanger 510, it will absorb the heat of the heat storage agent in the heat storage tank 501, affecting the overall thermal utilization efficiency of the heat storage agent.

[0101] Of course, when the evaporator 41 adopts other defrosting methods such as those mentioned above, since the compressor 10 stops working and the heat storage heat exchanger 510 does not circulate refrigerant, the above problems will not occur. Therefore, the heat storage heat exchanger 510 and the throttling device 20 and the compressor 10 can be connected or not connected.

[0102] Further, see Figure 1 , Figure 2 , Figure 3 and Figure 4 A first thermal storage control valve 63 is connected between the thermal storage heat exchanger 510 and the throttling device 20. The first thermal storage control valve 63 is used to connect the compressor 10 and the thermal storage heat exchanger 510 when the evaporator 41 is cooling, and disconnect the compressor 10 and the thermal storage heat exchanger 510 when the evaporator 41 is defrosting. A second thermal storage control valve 64 is connected between the compressor 10 and the thermal storage heat exchanger 510. The second thermal storage control valve 64 is used to only allow the refrigerant to flow from the thermal storage heat exchanger 510 to the throttling device 20.

[0103] In actual operation, when the evaporator 41 is cooling, the first heat storage control valve 63 connects the heat storage heat exchanger 510 and the compressor 10, and the first heat storage control valve 63 allows the refrigerant to flow from the heat storage heat exchanger 510 to the throttling device 20. The high-temperature and high-pressure refrigerant generated by the compressor 10 flows through the condenser 30 in one way and the heat storage heat exchanger 510 in the other way, and then converges, and then flows back to the compressor 10 through the throttling device 20 and the evaporator 41. When the evaporator 41 is defrosted, the high-temperature and high-pressure refrigerant generated by the compressor 10 flows back to the compressor 10 through the evaporator 41, the throttling device 20 and the condenser 30. At this time, since the first heat storage control valve 63 disconnects the heat storage heat exchanger 510 and the compressor 10, and the first heat storage control valve 63 does not allow the refrigerant to flow from the throttling device 20 to the heat storage heat exchanger 510, the refrigerant flowing out of the throttling device 20 cannot flow back to the compressor 10 through the heat storage heat exchanger 510, and the refrigerant flowing out of the condenser 30 cannot flow back to the heat storage heat exchanger 510.

[0104] Thus, by providing the first heat storage control valve 63 and the second heat storage control valve 64, it can be ensured that the heat storage heat exchanger 510 only releases heat to the heat storage agent without absorbing the heat of the heat storage agent, thereby improving the heat utilization efficiency of the heat storage agent and also helping to reduce the energy consumption of the entire system.

[0105] Preferably, the first heat storage control valve 63 is a solenoid valve, and the second heat storage control valve 64 is a one-way valve, which can reduce the control. Of course, the first heat storage control valve 63 and the second heat storage control valve 64 can also be solenoid valves.

[0106] It can be understood that the main controller is electrically connected to the first heat storage control valve 63, and the main controller is used to control the first heat storage control valve 63 to be energized in the refrigeration mode to connect the heat storage heat exchanger 510 and the compressor 10, and the main controller is used to control the first heat storage control valve 63 to be de-energized in the defrost mode to disconnect the cold storage heat exchanger 421 and the compressor 10.

[0107] Further, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The cold storage device 42 is connected in parallel with the evaporator 41 between the throttling device 20 and the compressor 10. When the evaporator 41 is cooling, the cold storage device 42 is connected with the throttling device 20 and the compressor 10, and stores the cold amount of the low-temperature refrigerant flowing through itself. When the cold amount stored in the cold storage device 42 reaches the cold amount threshold, the first thermal storage control valve 63 disconnects the compressor 10 and the thermal storage heat exchanger 510. Specifically, a first temperature sensing package 422 is provided in the cold storage device 42. When the temperature value detected by the first temperature sensing package 422 reaches the first threshold (indicating that the cold storage device 42 reaches the cold amount threshold), the first thermal storage control valve 63 disconnects the compressor 10 and the thermal storage heat exchanger 510.

[0108] At this time, in the cooling mode, when the temperature value detected by the first temperature sensing package 422 reaches the first threshold value, it means that the cold storage capacity of the cold storage device 42 is sufficient. At this time, the second cold storage control valve 62 will disconnect the cold storage heat exchanger 421 and the throttling device 20. Under the premise of ensuring that the evaporator 41 has the same cooling capacity, the amount of refrigerant generated by the compressor 10 should be reduced in theory. If the refrigerant continues to flow through the heat storage heat exchanger 510 to heat the heat storage agent, the refrigerant acting on the condenser 30 will become smaller, and the temperature of the heat storage agent will increase, so that the heat released by the refrigerant through the heat storage heat exchanger 510 and the condenser 30 is insufficient, and then the temperature of the refrigerant flowing through the evaporator 41 is not low enough, reducing the cooling capacity of the evaporator 41 and causing the warehouse temperature to fluctuate. Therefore, when the second cold storage control valve 62 is closed (disconnecting the cold storage heat exchanger 421 and the throttling device 20), the first heat storage control valve 63 is also closed at the same time (disconnecting the heat storage heat exchanger 510 and the compressor 10), which helps the evaporator 41 to stabilize the cooling.

[0109] It should be noted that when the first thermal storage control valve 63 is closed, the thermal storage agent has reached a certain temperature. At this time, disconnecting the first thermal storage control valve 63 can heat the thermal storage agent to the target temperature by utilizing the residual heat of the compressor 10. It can be understood that when the first thermal storage control valve 63 is closed, the temperature of the thermal storage agent in the thermal storage tank 501 is lower than the temperature of the thermal storage agent when it flows through the compressor 10.

[0110] Further, see Figure 1 , Figure 2 , Figure 3 and Figure 4 A second temperature sensing bag 511 is arranged in the heat storage tank 501, and a third temperature sensing bag 512 is arranged in the heat storage pipeline 502 wound around the compressor 10. When the difference between the temperature value detected by the third temperature sensing bag 512 and the temperature value detected by the second temperature sensing bag 511 does not exceed the second threshold value, the heat storage circuit and the heat release circuit are both disconnected.

[0111] In actual operation, as the heat storage agent is continuously heated, the temperature of the heat storage agent in the heat storage tank 501 gradually approaches the temperature of the heat storage agent when it passes through the heat storage pipeline 502 arranged on the compressor 10. When the difference between the two temperatures does not exceed the second threshold value, the heating effect of the residual heat of the compressor 10 on the heat storage agent is no longer obvious, indicating that the heat storage agent has reached sufficient heat storage, and the heat storage circuit is disconnected. It can be understood that the heat release circuit is also disconnected at this time. In this way, the defrost system can maximize the use of the residual heat of the compressor 10 for defrosting and minimize energy consumption.

[0112] Specifically, when the difference between the temperature value detected by the third temperature sensing package 512 and the temperature value detected by the second temperature sensing package 511 does not exceed the second threshold, the first thermal storage valve 503 and the second thermal storage valve 504 are closed. The second threshold may be 5 degrees Celsius.

[0113] In other embodiments, the opening and closing of the first thermal storage control valve 63 can also be controlled by monitoring the temperature of the thermal storage agent in the thermal storage tank 501 through the second thermal sensing package 511. When the temperature value detected by the second thermal sensing package 511 reaches the third threshold, the first thermal storage control valve 63 is closed.

[0114] It can be understood that the second temperature sensing package 511 and the third temperature sensing package 512 are electrically connected to the main controller, and the main controller controls the opening and closing of the first heat storage control valve 63 and the second heat storage control valve 64 according to the temperature values ​​of the second temperature sensing package 511 and the third temperature sensing package 512.

[0115] Furthermore, the cold storage device 42 is wrapped with a first insulation layer, and / or the heat storage device 50 is wrapped with a second insulation layer. By wrapping the first insulation layer around the cold storage device 42 and the second insulation layer around the heat storage device 50, convection between the cold storage device 42 and the heat storage device 50 and the outside world can be avoided, which will neither reduce the amount of cold or heat stored in the cold storage device 42 nor affect the outside temperature.

[0116] The defrost system provided in the embodiment of the present application arranges a cold storage device 42 near the evaporator 41, and utilizes the cold storage device 42 to absorb and neutralize the heat emitted by the evaporator 41 during defrosting, thereby preventing the heat from being emitted into the cold storage and causing fluctuations in the storage temperature, which is beneficial to maintaining the stability of the cold storage temperature and helps to ensure the storage quality of the goods.

[0117] In one embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 4 The defrost system includes the reversing valve 65, the compressor 10, the condenser 30, the evaporator 41, the cold storage device 42, the heat storage device 50, the casing 43 and the temperature insulation chamber 4311 in the above embodiment. The cold storage device 42 includes the cold storage heat exchanger 421 and the cold storage agent in the above embodiment, and the cold storage device 42 also includes the first temperature sensing bag 422 for measuring the temperature of the cold storage agent in the above embodiment. The heat storage device 50 includes the heat storage heat exchanger 510, the heat storage tank 501, the heat storage pipeline 502, the heat release pipeline 505, the first heat storage valve 503, the second heat storage valve 504, the first heat release valve 506, the second heat release valve 507, the recovery valve 508, the second temperature sensing bag 511 and the third temperature sensing bag 512 in the above embodiment. The defrost system also includes the first heat storage control valve 63, the second heat storage control valve 64, the first cold storage control valve 61 and the second cold storage control valve 62 in the above embodiment. For the connection and setting conditions between the various components, please refer to the description in the above embodiment and will not be repeated here.

[0118] In this embodiment, the working process of the defrost system is: when the defrost system enters the cooling mode, the control reversing valve 65 is powered off, the first heat storage control valve 63 is opened, the throttling device 20 is opened, the second heat storage control valve 64 is opened, the first heat storage valve 503 is opened, the second heat storage valve 504 is opened, the first heat release valve 506 is closed, the second heat release valve 507 is closed, the recovery valve 508 is closed, the first temperature sensing bag 422 is opened, the second temperature sensing bag 511 is opened, the third temperature sensing bag 512 is opened, and the temperature insulation chamber 4311 is closed. The compressor 10 is working, the cold storage device 42 starts to store cold, and the heat storage device 50 starts to store heat (see Figure 1 ). When the temperature value detected by the first temperature sensing package 422 reaches the first threshold value, the main controller controls the second cold storage control valve 62 to close and the first heat storage control valve 63 to close, completing the cold storage (see Figure 2 ). When the temperature difference between the third temperature sensing bag 512 and the second temperature sensing bag 511 reaches the third threshold, the first heat storage valve 503 is controlled to be closed and the second heat storage valve 504 is controlled to be closed to complete heat storage. When entering the defrost mode, the control reversing valve 65 is energized, the first heat storage control valve 63 is closed, the throttling device 20 is opened, the second heat storage control valve 64 is closed, the first heat storage valve 503 is closed, the second heat storage valve 504 is closed, the first heat release valve 506 is opened, the second heat release valve 507 is opened, the recovery valve 508 is closed, the first temperature sensing bag 422 is closed, the second temperature sensing bag 511 is closed, the third temperature sensing bag 512 is closed, and the temperature insulation chamber 4311 is opened (see Figure 3 ). The compressor 10 is working, the evaporator 41 starts heating and defrosting, and the heat storage agent flows through the evaporator 41 to assist heating and defrosting. The heat dissipated by the evaporator 41 flows through the insulation cavity 4311 into the second cavity of the casing 43 and is absorbed by the refrigerant. When the defrosting is finished, the cooling mode is entered. At this time, there will be a transition state. When the defrosting system is in the transition state, the recovery valve 508 is opened, and the heat storage agent in the recovery tank 509 flows back into the heat storage agent. When the heat storage agent in the recovery tank 509 flows back to the heat storage tank 501, the recovery valve 508 is closed (see Figure 4 ), enters normal cooling mode. This cycle repeats.

[0119] In addition, a refrigeration device is also provided in an embodiment of the present application, which includes a warehouse and a defrosting system provided in any of the above embodiments, and the evaporator 41 and the cold storage device 42 are located in the warehouse. Since the refrigeration device includes the above defrosting system, it has all the above beneficial effects, which are not repeated here. It can be understood that the warehouse is used to store goods, and the evaporator 41 is used to cool the interior of the warehouse.

[0120] Optionally, the refrigeration equipment is a refrigerator, a freezer, a cold storage or a refrigerated truck, etc.

[0121] Also, see Figure 5In the embodiment of the present application, there is also provided a cold air machine 40, comprising a housing 43, an evaporator 41 and a cold storage device 42. The housing 43 has a first cavity, a second cavity and a conducting portion 431. The conducting portion 431 is used to conduct the first cavity and the second cavity. The evaporator 41 is located in the first cavity, the conducting portion 431 is connected to the top of the evaporator 41, and the cold storage device 42 is located in the second cavity. The cold storage device 42 and the evaporator 41 are constructed to be connected in parallel between the throttling device 20 and the compressor 10. When the evaporator 41 is cooling, the cold storage device 42 is connected to the throttling device 20 and the compressor 10, and stores the cold of the low-temperature refrigerant flowing through itself. When the evaporator 41 is defrosted, the cold storage device 42 uses its own stored cold to neutralize the heat emitted by the evaporator 41.

[0122] In the actual operation of the above-mentioned air cooler 40, all the heat generated when the evaporator 41 is defrosted is contained in the casing 43. During the natural rising process, the heat is guided to the second cavity through the conduction part 431 connected to the top of the evaporator 41, and is absorbed and neutralized by the cold storage device 42 in the second cavity. In this way, it is possible to avoid heat dissipation into the cold storage and causing fluctuations in storage temperature. Moreover, the cold storage device 42 can use the refrigerant to store cold in the refrigeration mode, and use its own stored cold to neutralize heat in the defrost mode to increase its own temperature. When entering the next refrigeration mode, it can store cold again for use in the next defrost, and it can be circulated. In this way, there is no need to manually replace the new cold storage device 42 after defrosting, thereby improving the defrosting automation and defrosting efficiency.

[0123] It can be understood that the housing 43 also has an air outlet connecting the first cavity and the outside of the housing 43, and the air outlet is located below the evaporator 41. In this way, the cold air generated by the evaporator 41 during refrigeration enters the cold storage of the refrigeration device through the air outlet.

[0124] In some embodiments, the conduction portion 431 is configured to controllably conduct or disconnect the first cavity and the second cavity. When the evaporator 41 is cooling, the conduction portion 431 disconnects the first cavity and the second cavity. When the evaporator 41 is defrosting, the conduction portion 431 connects the first cavity and the second cavity.

[0125] In actual operation, the first cavity is connected to the cold storage, and the second cavity is not connected to the cold storage. When the evaporator 41 is cooling, the cold energy emitted by the evaporator 41 enters the cold storage through the first cavity to reduce the temperature of the cold storage. At this time, the first cavity and the second cavity are not connected. In this way, it can be avoided that the cold energy emitted by the evaporator 41 enters the second cavity and causes the cold storage device 42 to be overcooled or the temperature is not enough. When the evaporator 41 is defrosted, the conductive part 431 connects the first cavity and the second cavity. The heat dissipated by the evaporator 41 can enter the second cavity through the first cavity during the natural rising process, so as to be absorbed and neutralized by the cold storage device 42. In this way, it is convenient to accurately control the temperature of the cold storage device 42, avoid overcooling of the cold storage device 42, and also help to improve the refrigeration effect of the evaporator 41.

[0126] Further, see Figure 5 , the second cavity is located above the first cavity. At this time, the conducting portion 431 can be only a straight flow channel such as a conducting hole, which helps to reduce the length of the guide path of the conducting portion 431 and simplify the structure of the entire system. Of course, in other embodiments, the second cavity can also be located in other positions of the first cavity, and the conducting portion 431 can guide the naturally rising heat dissipated by the evaporator 41 to the second cavity, and be absorbed and neutralized by the cold storage device 42 in the second cavity. However, the structure of the conducting portion 431 at this time is more complicated, and it can be a curved pipe, etc. For example, when the second cavity and the first cavity are located in the same horizontal plane, the heat is guided from the top of the first cavity to the bottom of the second cavity through the conducting portion 431.

[0127] Further, see Figure 5 The conducting portion 431 includes a temperature-isolating cavity 4311, which separates the housing 43 into a first cavity and a second cavity. The temperature-isolating cavity 4311 is controlled to be simultaneously connected to or disconnected from the first cavity and the second cavity.

[0128] At this time, when the evaporator 41 is cooling, the temperature-insulating cavity 4311 is controlled to be disconnected from the first cavity and the second cavity at the same time, which serves to isolate the mutual transfer of temperature between the first cavity and the second cavity, avoid the cold storage device 42 from being overcooled or having insufficient temperature, and also help to improve the cooling effect of the evaporator 41. When the evaporator 41 is defrosting, the temperature-insulating cavity 4311 is connected to the first cavity and the second cavity at the same time, so that the heat in the first cavity can enter the second cavity after passing through the temperature-insulating cavity 4311.

[0129] Furthermore, the projected area of ​​the insulation cavity 4311 on the top of the evaporator 41 is equivalent to the area of ​​the top of the evaporator 41. At this time, since the heat generated by the evaporator 41 during defrosting is dissipated from the top of the evaporator 41, the conductive insulation cavity 4311 can quickly guide the heat to the second cavity.

[0130] In some embodiments, the evaporator 41 is constructed to be defrosted using a high-temperature refrigerant flowing through it. When the evaporator 41 is defrosted, the cold storage device 42 is not connected to the throttling device 20 and the compressor 10. At this time, when the evaporator 41 is defrosted, the high-temperature and high-pressure refrigerant generated by the compressor 10 first flows through the evaporator 41 to defrost the evaporator 41. At this time, the cold storage device 42 is disconnected from the throttling device 20 and the compressor 10 to prevent the high-temperature and high-pressure refrigerant from flowing through the cold storage device 42 during defrosting, causing the cold storage device 42 to be unable to neutralize the heat emitted by the evaporator 41 during defrosting.

[0131] Specifically, the process and principle of defrosting the evaporator 41 using the high-temperature refrigerant flowing through the evaporator 41 can be referred to the process of thermal defrosting mentioned in the above embodiment, which will not be described in detail here.

[0132] Specifically, see Figure 5 The cold storage device 42 includes a cold storage heat exchanger 421 and a cold storage agent. The cold storage heat exchanger 421 is connected in parallel with the evaporator 41 between the throttling device 20 and the compressor 10 for supplying low-temperature refrigerant to circulate. The cold storage agent is used to store the cold energy dissipated by the low-temperature refrigerant through the cold storage heat exchanger 421.

[0133] When the evaporator 41 is cooling, the low-temperature and low-pressure refrigerant flowing out of the throttling device 20 is divided into two paths, one path flows through the evaporator 41 and then returns to the compressor 10, and the other path flows through the cold storage heat exchanger 421 and then returns to the compressor 10. When the low-temperature and low-pressure refrigerant flows through the cold storage heat exchanger 421, the cold storage agent is cooled by the cold storage heat exchanger 421, so that the cold storage agent undergoes a positive phase change to store cold energy. When the evaporator 41 is defrosted, the cold storage heat exchanger 421 is not connected to the throttling device 20 and the compressor 10. At this time, the heat emitted by the evaporator 41 is absorbed by the cold storage agent of the cold storage device 42 and is neutralized by the cold energy stored in the cold storage agent. At this time, the cold storage agent undergoes a reverse phase change to prepare for the next cold storage.

[0134] Among them, the cold storage heat exchanger 421 can be a plate heat exchanger, a fin heat exchanger or a tube heat exchanger, without specific limitation. Among them, the cold storage agent is made of phase change cold storage material, which is a functional material for storing cold in the phase change cold storage system. The cold storage and release thereof are performed by the phase change cold storage material, and its physical and chemical properties do not change after undergoing an unlimited number of melting and solidification cycles. The phase change cold storage material is preferably a specific type, which is not limited here, and can be selected from high molecular polymers and water-absorbing resins.

[0135] In the air cooler 40 provided in the embodiment of the present application, all the heat generated when the evaporator 41 is defrosted is contained in the casing 43. During the natural rising process, the heat is guided to the second cavity through the conduction part 431 connected to the top of the evaporator 41, and is absorbed and neutralized by the cold storage device 42 in the second cavity. In this way, it is possible to prevent heat from being dissipated into the cold storage and causing fluctuations in the storage temperature. Moreover, the cold storage device 42 can use the refrigerant to store cold in the refrigeration mode, and use its own stored cold to neutralize the heat in the defrost mode to increase its own temperature. When entering the next refrigeration mode, it can store cold again for use in the next defrost, and it can be circulated. In this way, there is no need to manually replace the new cold storage device 42 after defrosting, thereby improving the defrosting automation and defrosting efficiency.

[0136] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0137] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A defrosting system, characterized in that: The invention comprises a compressor (10), an evaporator (41), a throttling device (20), a condenser (30) and a cold storage device (42), wherein the compressor (10), the evaporator (41), the throttling device (20) and the condenser (30) are connected in a circular manner in sequence to form a refrigerant circuit; The cold storage device (42) is arranged close to the evaporator (41), and is connected in parallel with the evaporator (41) and between the throttling device (20) and the compressor (10); When the evaporator (41) is cooling, the cold storage device (42) is connected to the throttling device (20) and the compressor (10), and stores the cold energy of the low-temperature refrigerant flowing through itself; when the evaporator (41) is defrosting, the cold storage device (42) uses the cold energy stored in itself to neutralize the heat emitted from the evaporator (41); The evaporator (41) is constructed to be defrosted using a high-temperature refrigerant flowing through the evaporator. When the evaporator (41) is defrosted, the cold storage device (42) is not connected to the throttling device (20) and the compressor (10).

2. The defrosting system according to claim 1, characterized in that: The cold storage device (42) comprises a cold storage heat exchanger (421) and a cold storage agent. The cold storage heat exchanger (421) and the evaporator (41) are connected in parallel between the throttling device (20) and the compressor (10) to allow low-temperature refrigerant to circulate. The cold storage agent is used to store the cold energy dissipated by the low-temperature refrigerant via the cold storage heat exchanger (421).

3. The defrosting system according to claim 2, characterized in that: A first cold storage control valve (61) is connected between the cold storage heat exchanger (421) and the compressor (10), wherein the first cold storage control valve (61) is used to only allow the refrigerant to flow from the cold storage heat exchanger (421) to the compressor (10); A second cold storage control valve (62) is connected between the cold storage heat exchanger (421) and the throttling device (20). The second cold storage control valve (62) is used to connect the cold storage heat exchanger (421) and the throttling device (20) when the evaporator (41) is refrigerating, and is used to disconnect the cold storage heat exchanger (421) and the throttling device (20) when the evaporator (41) is defrosting.

4. The defrosting system according to claim 3, characterized in that: The cold storage device (42) further includes a first temperature sensing package (422) for measuring the temperature of the cold storage agent; When the temperature value detected by the first temperature sensing package (422) reaches a first threshold value, the second cold storage control valve (62) disconnects the cold storage heat exchanger (421) and the throttling device (20).

5. The defrosting system according to claim 1, characterized in that: The invention also comprises a casing (43), wherein the casing (43) has a first cavity, a second cavity and a conducting portion (431), wherein the conducting portion (431) is used to conduct the first cavity and the second cavity, wherein the evaporator (41) is located in the first cavity, the cold storage device (42) is located in the second cavity, and the conducting portion (431) is connected to the top of the evaporator (41).

6. The defrosting system according to claim 5, characterized in that: The conducting portion (431) is configured to controllably conduct or disconnect the first cavity and the second cavity; When the evaporator (41) is cooling, the conducting portion (431) disconnects the first cavity and the second cavity; when the evaporator (41) is defrosting, the conducting portion (431) connects the first cavity and the second cavity.

7. The defrosting system according to claim 6, characterized in that: The conducting portion (431) comprises a temperature-isolating cavity (4311), wherein the temperature-isolating cavity (4311) separates the housing (43) into the first cavity and the second cavity, and the temperature-isolating cavity (4311) is controlled to be simultaneously conducted with or simultaneously disconnected from the first cavity and the second cavity.

8. The defrost system according to claim 1, characterized in that: It also includes a heat storage device (50), wherein the heat storage device (50) includes a heat storage tank (501) and a heat storage pipeline (502) and a heat release pipeline (505) for circulating a heat storage agent; The heat storage tank (501) comprises a heat storage outlet, a heat storage inlet, a heat release outlet and a heat release inlet; the heat storage pipeline (502) is arranged around the compressor (10) and forms a heat storage circuit with the heat storage tank (501) via the heat storage outlet and the heat storage inlet; the heat release pipeline (505) passes through the interior of the evaporator (41) and forms a heat release circuit with the heat storage tank (501) via the heat release outlet and the heat release inlet; The heat storage circuit and the heat release circuit are not connected at the same time.

9. The defrost system according to claim 8, characterized in that: A recovery tank (509), a first heat release valve (506) and a recovery valve (508) are provided on the heat release circuit, the recovery tank (509) is located between the evaporator (41) and the heat release inlet, the first heat release valve (506) is connected to the heat release pipeline (505) between the heat release outlet and the evaporator (41), and the recovery valve (508) is connected to the heat release pipeline (505) between the recovery tank (509) and the heat release inlet; The first heat-releasing valve (506) and the recovery valve (508) do not simultaneously conduct to the heat-releasing pipeline (505).

10. The defrost system according to claim 9, characterized in that: A second heat release valve (507) is also provided on the heat release circuit, and the second heat release valve (507) is connected to the heat release pipeline (505) between the evaporator (41) and the recovery tank (509).

11. The defrost system according to claim 8, characterized in that: A first heat storage valve (503) and a second heat storage valve (504) are provided on the heat storage circuit; the first heat storage valve (503) is connected to the heat storage pipeline (502) between the compressor (10) and the heat storage inlet; and the second heat storage valve (504) is connected to the heat storage pipeline (502) between the compressor (10) and the heat storage outlet.

12. The defrost system according to claim 8, characterized in that: The heat storage device (50) further comprises a heat storage heat exchanger (510), wherein the heat storage heat exchanger (510) is located in the heat storage tank (501), and the heat storage heat exchanger (510) and the condenser (30) are connected in parallel between the compressor (10) and the throttling device (20); When the evaporator (41) is cooling, the heat storage heat exchanger (510) is connected to the compressor (10) and the throttling device (20) to circulate the high-temperature refrigerant flowing out of the compressor (10) to heat the heat storage agent in the heat storage tank (501).

13. The defrost system according to claim 12, characterized in that: The evaporator (41) is constructed to be defrosted using a high-temperature refrigerant flowing through the evaporator; when the evaporator (41) is defrosted, the heat storage heat exchanger (510) is not connected to the throttling device (20) and the compressor (10).

14. The defrost system according to claim 13, characterized in that: A first heat storage control valve (63) is connected between the heat storage heat exchanger (510) and the throttling device (20), wherein the first heat storage control valve (63) is used to connect the compressor (10) and the heat storage heat exchanger (510) when the evaporator (41) is refrigerating, and to disconnect the compressor (10) and the heat storage heat exchanger (510) when the evaporator (41) is defrosting; A second heat storage control valve (64) is connected between the compressor (10) and the heat storage heat exchanger (510), and the second heat storage control valve (64) is used to only allow the refrigerant to flow from the heat storage heat exchanger (510) to the throttling device (20).

15. The defrost system according to claim 14, characterized in that: The cold storage device (42) is connected in parallel with the evaporator (41) between the throttling device (20) and the compressor (10). When the evaporator (41) is cooling, the cold storage device (42) is connected with the throttling device (20) and the compressor (10) and stores the cold energy of the low-temperature refrigerant flowing through the cold storage device (42). When the cold energy stored in the cold storage device (42) reaches a cold energy threshold, the first heat storage control valve (63) disconnects the compressor (10) and the heat storage heat exchanger (510).

16. The defrost system according to claim 14, characterized in that: A second temperature sensing bag (511) is arranged in the heat storage tank (501), and a third temperature sensing bag (512) is arranged in the heat storage pipeline (502) wound around the compressor (10). When the difference between the temperature value detected by the third temperature sensing bag (512) and the temperature value detected by the second temperature sensing bag (511) does not exceed a second threshold value, the heat storage circuit and the heat release circuit are both disconnected.

17. The defrost system according to claim 9, characterized in that: The cold storage device (42) is wrapped with a first thermal insulation layer, and / or the heat storage device (50) is wrapped with a second thermal insulation layer.

18. A refrigeration device, characterized in that: It comprises a storage body and a defrosting system as claimed in any one of claims 1 to 17, wherein the evaporator (41) and the cold storage device (42) are located in the storage body.

19. A cooling fan, characterized in that: include: A housing (43) having a first cavity, a second cavity and a conducting portion (431), wherein the conducting portion (431) is used to conduct the first cavity and the second cavity; An evaporator (41) is located in the first cavity, and the conducting portion (431) is connected to the top of the evaporator (41); and A cold storage device (42) is located in the second cavity, and the cold storage device (42) and the evaporator (41) are configured to be connected in parallel between the throttling device (20) and the compressor (10); When the evaporator (41) is cooling, the cold storage device (42) is connected to the throttling device (20) and the compressor (10), and stores the cold energy of the low-temperature refrigerant flowing through itself; when the evaporator (41) is defrosting, the cold storage device (42) uses the cold energy stored in itself to neutralize the heat emitted by the evaporator (41); The evaporator (41) is constructed to be defrosted using a high-temperature refrigerant flowing through it; when the evaporator (41) is defrosted, the cold storage device (42) is not connected to the throttling device (20) and the compressor (10), and uses its own stored cold to neutralize the heat dissipated from the evaporator (41).

20. The air cooler according to claim 19, characterized in that: The conducting portion (431) is configured to controllably conduct or disconnect the first cavity and the second cavity; When the evaporator (41) is cooling, the conducting portion (431) disconnects the first cavity and the second cavity; when the evaporator (41) is defrosting, the conducting portion (431) connects the first cavity and the second cavity.

Images