A passive defrosting cold storage system

Abstract

The present invention discloses a passive defrosting cold storage system, comprising: a compression condensing unit; the compression condensing unit comprises a compressor and a condenser connected in sequence; a thermal expansion valve, one end of the thermal expansion valve is connected to the drying filter; an evaporator, the inlet of the evaporator is connected to the other end of the thermal expansion valve, and the outlet of the evaporator is connected to the compressor, the evaporator comprises: an evaporator body, the evaporator body comprises a first end and a second end; fins, the fins are arranged on the evaporator body, and the fins extend from the first end of the evaporator body to the second end; fin grooves, the fin grooves are arranged on the fins, and the fin grooves extend from the first end of the evaporator body to the second end; a water distribution tray, the water distribution tray is arranged on the first end of the evaporator body, and the water distribution tray is connected to the fin grooves.

Description

Technical Field

[0001] The present application relates to the field of refrigeration technology, and in particular to a passive defrosting cold storage system. Background Art

[0002] The evaporator is a very important component among the four major parts of refrigeration. The low-temperature condensed liquid passes through the evaporator to exchange heat with the outside air, vaporizes and absorbs heat to achieve the refrigeration effect. When the water vapor in the air contacts the evaporator surface whose temperature is lower than the air dew point temperature, the water vapor will undergo a phase change and condense, which is called frosting. Frosting on the fins will seriously affect the heat exchange efficiency of the heat exchanger and increase energy loss.

[0003] Generally, defrosting methods are used to solve the problem of reduced heat exchange efficiency caused by frosting. Traditional defrosting methods include electric heating defrosting method and hot air defrosting method. The electric heating defrosting method defrosts by turning on the heating tube to generate heat. The power of the heating tube is very large, the temperature of the cold room fluctuates greatly, and it consumes a lot of electricity. If the quality of the heating tube is poor or it has been used for a long time, it is easy to burn out or even cause a fire, which poses a serious safety hazard. The hot air defrosting method defrosts by supplying hot air. The aluminum bar is subject to a large temperature difference, which makes the evaporator subject to greater thermal stress, and part of the frost will be melted and heated into water vapor, increasing the humidity in the cold room. The operating load of the compressor fluctuates greatly, and a lot of auxiliary equipment needs to be added. The structure is complex and the operation is cumbersome.

[0004] Therefore, there are at least the following technical problems in the prior art:

[0005] The methods used by cold storage systems in the prior art to solve the problem of evaporator defrosting are high in energy consumption, have safety risks, are complex in structure, and are cumbersome to operate.

[0006] Application Contents

[0007] The embodiments of the present application provide a passive defrosting cold storage system to solve the technical problems of high energy consumption, safety risks, complex structure and cumbersome operation of the evaporator defrosting method in the existing cold storage system.

[0008] In order to solve the above problems, an embodiment of the present application provides a passive defrosting cold storage system, the system comprising:

[0009] Compression condensing unit; the compression condensing unit comprises a compressor and a condenser connected in sequence;

[0010] a thermal expansion valve, one end of which is in communication with the condenser;

[0011] An evaporator, wherein the inlet of the evaporator is connected to the other end of the thermal expansion valve, and the outlet of the evaporator is connected to the compressor, and the evaporator comprises:

[0012] an evaporator body, the evaporator body comprising a first end and a second end;

[0013] A fin, wherein the fin is disposed on the evaporator body and extends from the first end to the second end of the evaporator body;

[0014] a fin groove, the fin groove being arranged on the fin, the fin groove extending from the first end to the second end of the evaporator body;

[0015] A water distribution tray is disposed on the first end of the evaporator body and is communicated with the fin groove.

[0016] Furthermore, the compression condensing unit also includes:

[0017] A liquid reservoir, wherein an inlet of the liquid reservoir is connected to the condenser;

[0018] A drying filter, wherein the inlet of the drying filter is connected to the outlet of the liquid reservoir, and the outlet of the drying filter is connected to the thermal expansion valve;

[0019] a first manual stop valve, the first manual stop valve being connected in series between the filter drier and the thermal expansion valve;

[0020] A second manual stop valve is connected in series between the evaporator and the compressor.

[0021] Furthermore, the thermal expansion valve includes a temperature-sensing package, which is connected to the outlet end of the evaporator to obtain the refrigerant temperature at the outlet end of the evaporator, and the thermal expansion valve controls the flow rate of the refrigerant according to the temperature.

[0022] Further, the water distribution tray is connected to the fin groove via a connecting groove, and the connecting groove includes:

[0023] A first groove, wherein the first groove is disposed on an edge of the water distribution tray, and an inner end of the first groove is communicated with the water distribution tray;

[0024] The second groove is arranged on the edge of the water distribution tray, the upper end of the second groove is connected to the outer end of the first groove, and the lower end of the second groove is connected to the inlet end of the rib groove.

[0025] Furthermore, the evaporator includes a plurality of fins, the fins are parallel to each other, and the fins are arranged on the evaporator body at intervals.

[0026] Furthermore, the evaporator further comprises a plurality of connecting grooves, the connecting grooves correspond to the fin grooves one by one, and the water distribution tray is connected to the fin grooves through the corresponding connecting grooves.

[0027] Furthermore, the edge of the water distribution tray is recessed toward the rib groove to form the first groove, and the edge of the water distribution tray is recessed toward the center of the water distribution tray to form the second groove, the upper end of the second groove is connected to the outer end of the first groove, and the lower end of the second groove is connected to the rib groove.

[0028] Furthermore, the groove bottom of the second groove and the groove bottom of the rib groove are located on the same plane.

[0029] Furthermore, the fin groove is a straight groove recessed toward the evaporator body, and the groove depth of the fin groove is 3 to 6 mm, and the groove width of the fin groove is 1 to 3 mm.

[0030] Furthermore, the evaporator further comprises:

[0031] A water collecting tray is arranged on the second end of the evaporator body and is communicated with the fin groove.

[0032] The above one or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

[0033] (1) In the embodiment of the present application, fin grooves are provided on the fins of the evaporator. Since the temperature of the fin grooves is lower than the freezing point of water in the working state, the water in the water distribution tray flows into the fin grooves and freezes. When the water vapor contacts the fin surface whose temperature is lower than the dew point of the air, the water vapor will undergo a phase change and condense. However, since the water vapor partial pressure on the ice surface in the fin groove is lower than that on other surfaces of the fin, the water in the air will condense and grow on the ice surface, so that frost will not form on both sides of the fin, thereby preventing the frost layer from hindering the air flow between the coils, thereby not affecting the heat exchange efficiency of the evaporator, and allowing normal heat exchange without the need for defrosting operation, and without the need for additional power supply or additional equipment. The technical problems of high energy consumption, safety risks, complex structure and cumbersome operation of the evaporator defrosting method in the existing refrigeration system are solved, and the cold storage system coefficient of performance (COP) and heating capacity can be effectively prevented from decreasing and the effect of safe energy saving can be achieved.

[0034] (2) The liquid storage device described in the embodiment of the present application can prevent excessive accumulation of refrigerant condensate in the condenser, thereby reducing the heat transfer area and affecting the heat transfer effect of the condenser; it can also adapt to the demand for supply volume due to load changes of the evaporator. When the evaporation load increases, the supply volume also increases and is replenished by the liquid stored in the liquid storage device; when the load decreases, the required amount of refrigerant liquid also decreases, and the excess refrigerant liquid is stored in the liquid storage tank; in addition, it can play a certain role in silencing and filtering, and can also prevent liquid hammer on the compressor.

[0035] (3) The inlet of the drying filter described in the embodiment of the present application is connected to the outlet of the liquid storage tank, and the outlet of the drying filter is connected to the thermal expansion valve; the drying filter has the function of drying and filtering the liquid refrigerant coming out of the condenser, thereby preventing the thermal expansion valve with a narrower passage from being blocked.

[0036] (4) The first manual stop valve described in the embodiment of the present application is connected in series between the drying filter and the thermal expansion valve, and the second manual stop valve is connected in series between the evaporator and the compressor, so as to adjust the flow rate and control the on-off.

[0037] (5) The thermal expansion valve described in the embodiment of the present application includes a temperature sensing package, which is connected to the outlet of the evaporator to obtain the refrigerant temperature at the outlet of the evaporator, and the thermal expansion valve can adjust the flow rate of the refrigerant according to the temperature.

[0038] (6) The water in the water distribution tray described in the embodiment of the present application first overflows into the first groove with the notch facing upward, then flows through the first groove to the second groove with the notch facing horizontally outward, and then flows into the fin groove, so that the water flows smoothly from the water distribution tray to the fin groove.

[0039] (7) The bottom of the second groove described in the embodiment of the present application is located on the same plane as the bottom of the fin groove, thereby ensuring that water flows along the bottom of the fin groove. This not only ensures that the water does not overflow, but also makes the water in the fin groove closer to the root of the fin with a lower temperature, thereby freezing quickly.

[0040] (8) The water collecting tray described in the embodiment of the present application is arranged on the second end of the evaporator body, and the water collecting tray is connected to the outlet end of the fin groove, and the water collecting tray has the function of collecting water flowing out from above.

[0041] (9) The water collecting tray described in the embodiment of the present application is provided with an opening on a side facing the evaporator body, and the opening covers the outlet end of the fin groove to communicate with the fin groove and prevent water in the fin groove from splashing out; the water collecting tray is also provided with a drain outlet, and the drain outlet is provided with a switch. When the water in the water collecting tray is full, the water can be discharged out through the drain outlet.

[0042] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic structural diagram of a passive defrosting cold storage system in one embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the structure of an evaporator of a passive defrosting cold storage system according to an embodiment of the present invention Figure 1 ;

[0045] Figure 3 A schematic diagram of the structure of an evaporator of a passive defrosting cold storage system according to an embodiment of the present invention Figure 2 .

[0046] Explanation of the reference numerals: evaporator 100, evaporator body 110, water distribution tray 120, fins 130, fin grooves 140, connecting grooves 150, first grooves 151, second grooves 152, water collecting tray 160, compression condensing unit 200, compressor 210, condenser 220, liquid storage tank 230, drying filter 240, thermal expansion valve 300, first manual stop valve 400, second manual stop valve 500. DETAILED DESCRIPTION

[0047] The embodiments of the present application provide a passive defrosting cold storage system to solve the technical problems that the defrosting method used by the refrigeration system in the prior art to solve the problem of reduced heat exchange efficiency due to frosting of the evaporator has high energy consumption, safety risks, complex structure and cumbersome operation.

[0048] In order to solve the above technical problems, the overall idea of ​​the technical solution provided by this application is as follows:

[0049] The embodiment of the present application arranges fin grooves on the fins of the evaporator. Since the temperature of the fin grooves is lower than the freezing point of water in the working state, the water in the water distribution tray flows into the fin grooves and freezes. When the water vapor contacts the fin surface whose temperature is lower than the air dew point temperature, the water vapor will undergo a phase change and condense. However, since the water vapor partial pressure on the ice surface in the fin groove is lower than that on other surfaces of the fin, the water in the air will condense and grow on the ice surface, so that no frost will form on both sides of the fin, thereby preventing the frost layer from hindering the air flow between the coils, thereby not affecting the heat exchange efficiency of the evaporator, and allowing normal heat exchange without the need for defrosting operation and without the need for additional power supply and equipment. The technical problems of high energy consumption, safety risks, complex structure and cumbersome operation of the evaporator defrosting method in the existing refrigeration system are solved, and the cold storage system coefficient of performance (COP) and heating capacity can be effectively prevented from decreasing and the safety and energy-saving effect is achieved.

[0050] The technical solution of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0051] Figure 1 FIG. 1 is a schematic diagram of a passive defrosting cold storage system according to an embodiment of the present invention. Figure 1 As shown, the system includes a compression condensing unit 200 , a thermal expansion valve 300 and an evaporator 100 .

[0052] The compression condensing unit 200 includes a compressor 210 and a condenser 220 connected in sequence; one end of the thermal expansion valve 300 is connected to the drying filter 240; the inlet of the evaporator 100 is connected to the other end of the thermal expansion valve 300, and the outlet of the evaporator 100 is connected to the compressor 210.

[0053] Specifically, in this embodiment, the evaporator 100, the compressor 210, the condenser 220 and the thermal expansion valve 300 are connected end to end to form a channel for the circulation of the refrigerant. The compressor 210 compresses the gaseous refrigerant into a high-temperature and high-pressure gaseous state, and sends it to the condenser 220 for cooling. After cooling, the refrigerant becomes a medium-temperature and high-pressure liquid refrigerant, and is throttled and reduced in pressure by the thermal expansion valve 300 to become a low-temperature and low-pressure gas-liquid mixture, and then absorbs heat from the air through the evaporator 100 and vaporizes into a gaseous state, and then returns to the compressor 210 to continue compression, and circulates refrigeration.

[0054] Figure 2 A schematic diagram of the structure of an evaporator of a passive defrosting cold storage system according to an embodiment of the present invention Figure 1 , Figure 3 A schematic diagram of the structure of an evaporator of a passive defrosting cold storage system according to an embodiment of the present invention Figure 2 ,like Figure 2 , 3 As shown, the evaporator 100 includes an evaporator body 110 , fins 130 , fin grooves 140 and a water distribution tray 120 .

[0055] The evaporator body 110 includes a first end and a second end, wherein, in the use state, the first end is the top end and the second end is the bottom end. Figure 1 shown.

[0056] The fins 130 are disposed on the evaporator body 110 , and the fins 130 extend from the first end to the second end of the evaporator body 110 .

[0057] The fin groove 140 is formed on the fin 130 . The fin groove 140 extends from the first end to the second end of the evaporator body 110 . The fin groove 140 includes an inlet end and an outlet end.

[0058] The water distribution tray 120 is fixedly disposed on the first end of the evaporator body 110 , and the water distribution tray 120 is communicated with the inlet end (upper end) of the fin groove 140 .

[0059] In the embodiment of the present application, the fin groove 140 is provided on the fin 130 of the evaporator. Since the temperature of the fin groove 140 is lower than the freezing point of water in the working state, the water in the water distribution tray flows into the fin groove 140 and freezes. When the water vapor contacts the surface of the fin 130 whose temperature is lower than the dew point temperature of the air, the water vapor will undergo a phase change and condense. However, since the water vapor partial pressure on the ice surface in the fin groove 140 is lower than that on other surfaces of the fin 130, the water in the air will condense and grow on the ice surface, so that frost will not form on both sides of the fin 130. It avoids the frost layer hindering the air flow between the coils, thereby not affecting the heat exchange efficiency of the evaporator, and can exchange heat normally without defrosting operation, and without the need for additional power supply and additional equipment. It solves the technical problems of high energy consumption, safety risks, complex structure and cumbersome operation in the defrosting method adopted by the refrigeration system in the prior art to solve the problem of reduced heat exchange efficiency of the evaporator due to frosting. It has the beneficial effects of effectively preventing the reduction of the coefficient of performance (COP) and heating capacity of the cold storage system, and being safe, energy-saving, convenient, easy to use, worry-free and labor-saving.

[0060] Specifically, in this embodiment, when no water is added to the water distribution tray 120, the cold storage system described in the embodiment of the present application can be used as a traditional cold storage system. After adding water to the water distribution tray 120, the cold storage system described in the embodiment of the present application can play a role of passive defrosting.

[0061] In an embodiment of the present application, the compression condensing unit further includes a liquid storage tank 230 , a drying filter 240 , a first manual stop valve 400 , and a second manual stop valve 500 .

[0062] The inlet of the liquid storage device 230 is connected to the condenser 220. In this embodiment, the liquid storage device 230 is a high-pressure liquid storage device. The liquid storage device 230 can prevent the refrigerant condensate from accumulating too much in the condenser 220, thereby reducing the heat transfer area and affecting the heat transfer effect of the condenser; it can also adapt to the demand for the supply amount of the load change of the evaporator 100. When the evaporation load increases, the supply amount also increases, and the liquid stored in the liquid storage device 230 is replenished; when the load decreases, the required refrigerant liquid amount also decreases, and the excess refrigerant liquid is stored in the liquid storage tank; in addition, it can play a certain role in silencing and filtering, and can also prevent the compressor 210 from being liquid-hammered.

[0063] The inlet of the drying filter 240 is connected to the outlet of the liquid storage tank 230, and the outlet of the drying filter 240 is connected to the thermal expansion valve 300; the drying filter 240 has the function of drying and filtering the liquid refrigerant coming out of the condenser 220, so as to prevent the thermal expansion valve 300 with a narrow passage from being blocked.

[0064] The first manual stop valve 400 is connected in series between the filter drier 240 and the thermal expansion valve 300; the second manual stop valve 500 is connected in series between the evaporator 100 and the compressor 210 to adjust the flow and control the on-off function.

[0065] In one embodiment of the present application, the thermal expansion valve 300 includes a temperature sensing bag 310, which is connected to the outlet of the evaporator 100 to obtain the refrigerant temperature at the outlet of the evaporator 100, and the thermal expansion valve 300 can adjust the flow rate of the refrigerant according to the temperature.

[0066] In an embodiment of the present application, the evaporator 100 includes a plurality of fins 130 , each of the fins 130 is parallel to each other, and each of the fins 130 is arranged at intervals on the front and rear sides of the evaporator body 110 .

[0067] In one embodiment of the present application, the evaporator 100 further includes a plurality of connecting grooves 150 , which correspond one-to-one with the fin grooves 140 and are aligned vertically, and the water distribution tray 120 is connected with the fin grooves 140 through the corresponding connecting grooves 150 .

[0068] In one embodiment of the present application, the communication groove 150 includes a first groove 151 and a second groove 152, wherein the first groove 151 is disposed on the edge 121 of the water distribution tray 120, and the inner end of the first groove 151 is in communication with the water distribution tray 120; the second groove 152 is disposed on the edge of the water distribution tray 120, the upper end of the second groove 152 is in communication with the outer end of the first groove 151, and the lower end of the second groove 152 is in communication with the inlet end of the rib groove 140. In this embodiment, the water in the water distribution tray 120 flows into the rib groove 140 through the first groove 151 and the second groove 152 in sequence.

[0069] In one embodiment of the present application, the top surface of the edge 121 of the water distribution tray 120 is recessed toward the direction of the rib groove 140 (downward) to form the first groove 151, and the side surface of the edge 121 of the water distribution tray 120 is recessed toward the center of the water distribution tray 120 to form the second groove 152, the upper end of the second groove 152 is connected to the outer end of the first groove 151, and the lower end of the second groove 152 is connected to the inlet end of the rib groove 140.

[0070] In this embodiment, water is added to the water distribution tray 120 above the evaporator 100, and the water in the water distribution tray 120 first overflows into the first groove 151 with the notch facing upward, then flows through the first groove 151 to the second groove 152 with the notch facing horizontally outward, and then flows into the fin groove 140, so that the water flows smoothly from the water distribution tray 120 to the fin groove 140.

[0071] In one embodiment of the present application, the bottom of the second groove 152 and the bottom of the rib groove 140 are located on the same plane, thereby ensuring that water flows along the bottom of the rib groove 140, which not only ensures that the water does not overflow, but also makes the water in the rib groove 140 closer to the root of the fin 130 with a lower temperature, thereby freezing quickly.

[0072] In one embodiment of the present application, the fin groove 140 is a straight groove that is recessed toward the evaporator body 110 (the root of the fin 130), and the groove depth of the fin groove 140 is 3 to 6 mm, and the groove width of the fin groove is 1 to 3 mm. The fin groove 140 is a relatively small micro groove.

[0073] In an embodiment of the present application, the fins 130 are disposed on the outer surface of the evaporator body 110 , and the fins 130 are copper fins, aluminum fins, or stainless steel fins.

[0074] In one embodiment of the present application, the water distribution tray 120 is an open tray that is open upward.

[0075] In one embodiment of the present application, the evaporator 100 also includes a water collecting tray 160, which is arranged on the second end (bottom end) of the evaporator body 110, and the water collecting tray 160 is connected to the outlet end of the fin groove 140. The water collecting tray 160 has the function of collecting water flowing out from the top (including excess water added to the water distribution tray 120 and water formed after the frost layer melts).

[0076] In one embodiment of the present application, the water collecting tray 160 is provided with an opening on one side (top surface) facing the evaporator body 110, and the opening covers the outlet end of the rib groove 140 to communicate with the rib groove 140 and prevent water in the rib groove 140 from splashing out; the water collecting tray 160 is also provided with a drain outlet, and the drain outlet is provided with a switch. When the water in the water collecting tray 160 is full, the water can be discharged through the drain outlet. For example, the drain outlet is a water pipe and the switch is a stop valve.

[0077] In this embodiment, the evaporator body 110 is inserted into the water collecting tray 160, and the edge of the water collecting tray 160 is bent inward, so as to cover the outlet end of the rib groove 140 to prevent the water in the rib groove 140 from splashing out, and the cross-sectional shape of the evaporator body 110 and the water collecting tray 160 are both rectangular.

[0078] The above one or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:

[0079] (1) In the embodiment of the present application, the fin groove 140 is provided on the fin 130 of the evaporator. Since the temperature of the fin groove 140 is lower than the freezing point of water in the working state, the water in the water distribution tray flows into the fin groove 140 and freezes. When the water vapor contacts the surface of the fin 130 whose temperature is lower than the dew point of the air, the water vapor will undergo a phase change and condense. However, since the water vapor partial pressure on the ice surface in the fin groove 140 is lower than that on other surfaces of the fin 130, the water in the air will condense and grow on the ice surface, so that the two sides of the fin 130 will not freeze. Frost is avoided, which prevents the frost layer from hindering the air flow between the coils, thereby not affecting the heat exchange efficiency of the evaporator, and can exchange heat normally without defrosting operation, and without the need for additional power supply and additional equipment. It solves the technical problems of high energy consumption, safety risks, complex structure and cumbersome operation in the defrosting method adopted by the refrigeration system in the prior art to solve the problem of reduced heat exchange efficiency of the evaporator due to frosting. It has the beneficial effects of effectively preventing the reduction of the coefficient of performance (COP) and heating capacity of the cold storage system, and being safe, energy-saving, convenient, easy to use, worry-free and labor-saving.

[0080] (2) The liquid storage device 230 described in the embodiment of the present application can prevent excessive accumulation of refrigerant condensate in the condenser 220, thereby reducing the heat transfer area and affecting the heat transfer effect of the condenser; it can also adapt to the demand for supply volume due to load changes in the evaporator 100. When the evaporation load increases, the supply volume also increases and is replenished by the stored liquid in the liquid storage device 230; when the load decreases, the required amount of refrigerant liquid also decreases, and the excess refrigerant liquid is stored in the liquid storage tank; in addition, it can play a certain role in silencing and filtering, and can also prevent liquid hammer on the compressor 210.

[0081] (3) The inlet of the drying filter 240 described in the embodiment of the present application is connected to the outlet of the liquid storage tank 230, and the outlet of the drying filter 240 is connected to the thermal expansion valve 300; the drying filter 240 has the function of drying and filtering the liquid refrigerant coming out of the condenser 220, thereby preventing the thermal expansion valve 300 with a narrower passage from being blocked.

[0082] (4) The first manual stop valve 400 described in the embodiment of the present application is connected in series between the drying filter 240 and the thermal expansion valve 300, and the second manual stop valve 500 is connected in series between the evaporator 100 and the compressor 210, so as to adjust the flow rate and control the on-off.

[0083] (5) The thermal expansion valve 300 described in the embodiment of the present application includes a temperature sensing package 310, which is connected to the outlet of the evaporator 100 to obtain the refrigerant temperature at the outlet of the evaporator 100, and the thermal expansion valve 300 can adjust the flow rate of the refrigerant according to the temperature.

[0084] (6) The water in the water distribution tray 120 described in the embodiment of the present application first overflows into the first groove 151 with the groove opening facing upward, then flows through the first groove 151 to the second groove 152 with the groove opening facing horizontally outward, and then flows into the rib groove 140, so that the water flows smoothly from the water distribution tray 120 to the rib groove 140.

[0085] (7) The bottom of the second groove 152 described in the embodiment of the present application is located on the same plane as the bottom of the rib groove 140, thereby ensuring that water flows along the bottom of the rib groove 140, which not only ensures that the water does not overflow, but also makes the water in the rib groove 140 closer to the root of the fin 130 with a lower temperature, thereby freezing quickly.

[0086] (4) The water collecting tray 160 described in the embodiment of the present application is arranged on the second end of the evaporator body 110, and the water collecting tray 160 is connected to the outlet end of the fin groove 140. The water collecting tray 160 has the function of collecting water flowing out from the top (including excess water added to the water distribution tray 120 and water formed after the frost layer melts).

[0087] (5) The water collecting tray 160 described in the embodiment of the present application is provided with an opening on a side facing the evaporator body 110, and the opening covers the outlet end of the rib groove 140 to communicate with the rib groove 140 and prevent water in the rib groove 140 from splashing out; the water collecting tray 160 is also provided with a drain outlet, and the drain outlet is provided with a switch. When the water in the water collecting tray 160 is full, the water can be discharged out through the drain outlet.

[0088] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A passive defrosting cold storage system, characterized in that: The cold storage system comprises: Compression condensing unit; the compression condensing unit comprises a compressor and a condenser connected in sequence; a thermal expansion valve, one end of which is in communication with the condenser; an evaporator, wherein the inlet of the evaporator is connected to the other end of the thermal expansion valve, and the outlet of the evaporator is connected to the compressor, and the evaporator comprises: an evaporator body, the evaporator body comprising a first end and a second end; A fin, wherein the fin is disposed on the evaporator body and extends from the first end to the second end of the evaporator body; a fin groove, the fin groove being arranged on the fin, the fin groove extending from the first end to the second end of the evaporator body; A water distribution tray is disposed on the first end of the evaporator body and is communicated with the fin groove.

2. A passive defrosting cold storage system as claimed in claim 1, characterized in that: The compression condensing unit also includes: A liquid reservoir, wherein an inlet of the liquid reservoir is connected to the condenser; A drying filter, wherein the inlet of the drying filter is connected to the outlet of the liquid storage device, and the outlet of the drying filter is connected to the thermal expansion valve; a first manual stop valve, the first manual stop valve being connected in series between the filter drier and the thermal expansion valve; A second manual stop valve is connected in series between the evaporator and the compressor.

3. A passive defrosting cold storage system as claimed in claim 2, characterized in that: The thermal expansion valve includes a temperature sensing package, which is connected to the outlet end of the evaporator to obtain the refrigerant temperature at the outlet end of the evaporator, and the thermal expansion valve controls the flow rate of the refrigerant according to the temperature.

4. A passive defrosting cold storage system as claimed in claim 1, characterized in that: The water distribution tray is connected to the fin groove via a connecting groove, and the connecting groove includes: A first groove, wherein the first groove is disposed on an edge of the water distribution tray, and an inner end of the first groove is communicated with the water distribution tray; The second groove is arranged on the edge of the water distribution tray, the upper end of the second groove is connected to the outer end of the first groove, and the lower end of the second groove is connected to the inlet end of the rib groove.

5. A passive defrosting cold storage system as claimed in claim 4, characterized in that: The evaporator comprises a plurality of fins, the fins are parallel to each other, and the fins are arranged on the evaporator body at intervals.

6. A passive defrosting cold storage system as claimed in claim 5, characterized in that: The evaporator further comprises a plurality of communication grooves, the communication grooves correspond to the fin grooves one by one, and the water distribution tray is communicated with the fin grooves through the corresponding communication grooves.

7. A passive defrosting cold storage system as claimed in claim 6, characterized in that: The edge of the water distribution tray is recessed toward the rib groove to form the first groove, and the edge of the water distribution tray is recessed toward the center of the water distribution tray to form the second groove. The upper end of the second groove is connected to the outer end of the first groove, and the lower end of the second groove is connected to the rib groove.

8. A passive defrosting cold storage system as claimed in claim 7, characterized in that: The groove bottom of the second groove and the groove bottom of the rib groove are located on the same plane.

9. A passive defrosting cold storage system according to any one of claims 1 to 8, characterized in that: The fin groove is a straight groove recessed toward the evaporator body, and the groove depth of the fin groove is 3 to 6 mm, and the groove width of the fin groove is 1 to 3 mm.

10. A passive defrosting cold storage system as claimed in claim 1, characterized in that: The evaporator also includes: A water collecting tray is arranged on the second end of the evaporator body and is communicated with the fin groove.

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