A multi-connected cold storage air cooler and its system

Abstract

The present invention relates to a multi-connected cold storage air cooler and its system, including a compression condensing unit and an air cooler module, the compression condensing unit includes a condenser, a gas-liquid separator, a compressor and an oil separator, the outlet of the condenser is connected to a plurality of groups of air cooler modules through a high-pressure liquid pipe, the air cooler module includes an expansion valve, a solenoid valve, an evaporator, and a four-way valve, the inlet of each evaporator is connected to the air cooler inlet branch, the expansion valve is installed in the air cooler inlet branch, the air cooler inlet branch is connected to the high-pressure liquid pipe, a fan is installed on one side of the evaporator, and the outlet of the evaporator is connected to the four-way valve through the air cooler outlet branch. This patent realizes the switching of three modes: normal refrigeration mode, defrost drainage mode and defrost mode, which can avoid defrosting due to liquefaction of gaseous refrigerant in the high-pressure gas pipe and accumulation of liquid in the valve, prevent the influence of "water hammer" when switching modes, and can also realize uninterrupted refrigeration to ensure the quality and safety of refrigeration and freezing.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature refrigeration, and in particular to a multi-connected cold storage air cooler and a system thereof. Background Art

[0002] At present, the total capacity of cold storage in my country is increasing year by year, and the defrosting problem of the refrigeration system in cold storage has always been a hot topic in the field of low temperature and refrigeration. In the vapor compression refrigeration cycle, when the evaporator is in low temperature and low humidity, the evaporator frosting phenomenon is inevitable. Studies have shown that with the accumulation of frost, the heat exchange performance of the evaporator decreases and the energy consumption of the system increases. The existing common defrosting methods for cold storage include: electric defrosting, hot water defrosting and natural defrosting. However, the above three methods all have shortcomings and deficiencies: most of the heat of electric defrosting is lost to the air, and only a small amount is used to melt the frost layer, which makes the cooling time long and the energy consumption high; hot water defrosting is poor at the end of defrosting; and natural defrosting takes a long time to defrost when the temperature in the warehouse is too low. In particular, the above defrosting methods often cannot guarantee uninterrupted cold storage cooling, so frequent and multiple electric defrosting every day affects the preservation of stored food and causes damage to goods. In short, the existing defrosting technologies cannot guarantee the operating efficiency of the cold storage refrigeration system, and cannot achieve a balance between defrosting time and defrosting energy consumption.

[0003] To solve the above problems, the existing patent 1 publication number CN106679253A discloses a defrosting refrigeration system and cold storage. The defrosting refrigeration system includes a compressor, a water pan defrost pipe, an evaporator coil and a wind pressure differential switch, and the outlet of the compressor is connected to the inlet of the evaporator coil through a first branch and a second branch arranged in parallel to achieve the defrosting function. The invention defrosts by bypassing the hot air at the outlet of the compressor, thereby improving the defrosting efficiency of the cold storage evaporator, shortening the defrosting time, and reducing the impact of defrosting on the cold storage temperature. However, the invention cannot achieve uninterrupted refrigeration. When applied to the cold storage in defrosting mode, it will cause the indoor temperature to rise, which is not conducive to the protection and preservation of food and related refrigerated and frozen products. This method is actually a commonly used defrosting method for small cold storage refrigeration systems, and there is no substantial innovation.

[0004] Existing patent 2, publication number CN105466112A, discloses a hot air defrosting energy-saving refrigeration system, which adds hot air pipelines, pressure relief pipelines and bypass pipelines to the original refrigeration system, and respectively sets valve controls on the above pipelines, and combines the function of the central controller to make full use of the waste heat originally discharged to the atmosphere by the system to defrost the low-temperature system. This solution not only saves a lot of system defrosting electricity, but also can protect the stored food to the greatest extent, while bringing a more ideal defrosting effect, avoiding ice blockage caused by the accumulation of residual frost left by the unevenness of electric defrosting, and greatly reducing the failure rate. However, in the actual application of the present invention, when the high-pressure gas pipe is not defrosted for a long time, the high-pressure gas in the pipe will become liquid, and then produce "water hammer" when the mode is switched, affecting the normal operation of the system. In addition, all valves in the system are solenoid valves, and there is still room for further simplification to avoid the system being too complicated.

[0005] Existing patent 3 invention patent CN205896270U discloses a three-way defrost valve for cold storage and a cold storage defrost system, the defrost valve includes a main valve, a pilot valve and an electromagnetic coil, the electromagnetic coil is arranged on the right side of the pilot valve, and the main valve and the pilot valve are connected by a capillary; the main valve includes a main valve body, a group of air pipes on the main valve body, a main valve seat, a main valve block, and a piston is fixed at each end of the valve block; the right end of the slider in the pilot valve is connected to the pilot valve through a compression spring. The defrost system includes all evaporation exhaust pipes, three-way defrost valves, gas-liquid separators, compressors, condensers, liquid storage tanks, electromagnetic valves and expansion valves that are connected in sequence through pipelines to form a closed-loop pipeline. The three-way defrost valve controls the refrigerant to flow from the evaporation exhaust pipe to the compressor for normal refrigeration or from the compressor to the evaporation exhaust pipe for thermal defrosting. The present invention has a simple structure, is easy to operate, can be set to automatically time defrost, is energy-saving and efficient, safe and reliable, has a good defrost function, and is suitable for large, medium and small cold storages and various commonly used refrigerants. This technical solution proposes a three-way defrost valve for cold storage and a cold storage defrost system, which changes defrosting and normal operation to be controlled by the same three-way valve, with a simple structure, convenient operation, energy-saving, high efficiency, safety and reliability during defrosting. However, when the system is working normally, the gaseous refrigerant in the defrosting high-pressure gas pipe will still become liquid refrigerant, causing liquid accumulation in the three-way valve signal pipe, which is difficult to control, and the "water hammer" phenomenon generated when the mode is switched will also damage the system.

[0006] In view of the above background technology, we propose a technical solution of "a multi-connected cold storage air cooler and its system", and give the technical points that need to be protected and their principle descriptions. This patent mainly targets the hot gas bypass defrosting and similar defrosting solutions proposed in Patent 1, which cannot achieve uninterrupted defrosting and have relatively low energy efficiency during operation, as well as the uninterrupted defrosting technology and valves for multi-connected cold storage refrigeration units proposed in Patents 2 and 3. The high-pressure gas in the defrost pipe will turn into liquid in the cold storage, and then "water hammer" will occur during the mode switching process, and the four-way valve signal pipe will accumulate liquid, which will be difficult to control, affecting the normal operation of the system. Therefore, this application is proposed. Summary of the invention

[0007] The object of the present invention is to provide a multi-connected cold storage air cooler and a system thereof to solve the problems encountered in the above-mentioned background technology.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] A multi-connected cold storage air cooler and its system, comprising a compression condensing unit and an air cooler module, wherein the compression condensing unit comprises a condenser, a gas-liquid separator, a compressor and an oil separator, and the outlet of the condenser is respectively connected to a plurality of groups of air cooler modules through a high-pressure liquid pipe;

[0010] The air cooler module includes an expansion valve, a solenoid valve, an evaporator, and a four-way valve. The inlet of each evaporator is connected to the air cooler inlet branch. The expansion valve is installed in the air cooler inlet branch. The interface of the air cooler inlet branch is connected to the high-pressure liquid pipe. A fan is installed on one side of the evaporator. The outlet of the evaporator is connected to the fourth branch of the four-way valve through the air cooler outlet branch.

[0011] The first branch of the four-way valve is connected to the defrost high-pressure gas pipe through the defrost branch, the inlet of the defrost high-pressure gas pipe is connected to the high-pressure gas pipeline between the inlet of the condenser and the outlet of the oil separator, the inlet of the oil separator is connected to the exhaust port of the compressor, the bottom of the oil separator is connected to the air inlet of the gas-liquid separator through a capillary tube, and the outlet of the gas-liquid separator is connected to the air intake port of the compressor;

[0012] The second branch of the four-way valve is connected to the solenoid valve through a drain circuit, the liquid outlet of the solenoid valve is connected to the air cooler inlet branch, the third branch of the four-way valve is connected to the low-pressure gas pipe through a low-pressure gas pipe branch, and the end of the low-pressure gas pipe is connected to the air inlet pipe of the gas-liquid separator.

[0013] In the above scheme, in the refrigeration mode, the four-way valve connects the air cooler outlet branch with the low-pressure gas pipe branch, and the defrost branch with the drain circuit, and the solenoid valve is in a closed state at this time; the four-way valve is provided with a defrost preparation stage before the defrost mode, and the four-way valve is connected in the same manner as in the refrigeration mode, and the solenoid valve is in an open state at this time; in the defrost mode, the four-way valve connects the air cooler outlet branch with the defrost branch, and the drain circuit with the low-pressure gas pipe branch, and the solenoid valve is in a closed state at this time.

[0014] In the above scheme, the compression condensing unit is any one of air-cooled, water-cooled, and refrigerant-cooled.

[0015] In the above scheme, the compressor is one or a combination of a speed-controllable compressor, a gas-flow-adjustable compressor, and a fixed-speed compressor.

[0016] In the above solution, the drainage circuit is connected to an antifreeze coil of a water collecting pan, and the input end of the antifreeze coil is connected to the second branch of the solenoid valve.

[0017] A multi-connected cold storage air cooler system, the system comprises a multi-connected cold storage air cooler as described in any one of the above schemes, and also comprises an associated terminal connected to the multi-connected cold storage air cooler.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This patent realizes the switching of three modes: normal refrigeration mode, defrost drainage mode and defrost mode by setting a four-way valve, a drain circuit and a solenoid valve, realizes uninterrupted refrigeration of the cold room and temperature and humidity control of the cold room, reduces temperature fluctuations in the cold room during defrosting, and ensures the quality and safety of refrigeration and freezing;

[0020] 2. The four-way valve in this patent also has a defrost and drainage mode before the defrost mode. By setting up a drainage circuit and a solenoid valve, it can prevent the gaseous refrigerant in the defrost high-pressure gas pipe from turning into liquid refrigerant, and avoid liquid accumulation in the valve when switching modes, which makes it difficult to control. Therefore, there will be no "water hammer" phenomenon to damage the system.

[0021] 3. This patent converts the defrosting evaporator into the condenser of the refrigeration system during defrosting, effectively reducing the condensing temperature of the refrigeration system, improving the energy efficiency of the refrigeration system, and achieving uninterrupted refrigeration to ensure the quality and safety of refrigeration and freezing. This patent improves the reliability of the refrigeration system during operation and avoids the impact on the quality of refrigerated and frozen products due to the increase in temperature in the warehouse during the defrosting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of another embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the four-way valve in the present invention in the refrigeration and defrosting drainage modes;

[0025] Figure 4 It is a schematic diagram of the structure of the four-way valve in the present invention in the defrost mode.

[0026] Numbers in the figure: 1-condenser, 2-high-pressure liquid pipe, 3-expansion valve, 4-blower, 5-solenoid valve, 6-evaporator, 7-four-way valve, 8-low-pressure gas pipe, 9-defrost high-pressure gas pipe, 10-gas-liquid separator, 11-compressor, 12-oil separator, 13-high-pressure gas pipeline, 14-drainage circuit, 15-defrost branch, 16-cooler inlet branch, 17-cooler outlet branch, 18-low-pressure gas pipe branch, 19-capillary tube, 20-anti-frost coil, 21-solenoid pilot valve; 21.1-signal tube, 21.2-pilot valve slide valve, 21.3-pilot valve spring, 22-pneumatic four-way valve, 22.1-right cylinder, 22.2-left cylinder, 22.3-pneumatic slide valve; D-first branch; C-second branch; S-third branch; E-fourth branch. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] like Figure 1 and Figure 2 As shown, a multi-connected cold storage air cooler includes a compression condensing unit and an air cooler module. The compression condensing unit includes a condenser 1, a gas-liquid separator 10, a compressor 11 and an oil separator 12. The compression condensing unit is any one of air-cooled, water-cooled, and refrigerant-cooled. The outlet of the condenser 1 is connected to several groups of air cooler modules through a high-pressure liquid pipe 2. The compressor 11 can be a speed-controllable compressor or an unloading variable capacity adjustment compressor, which can realize this implementation scheme.

[0029] The air cooler module includes an expansion valve 3, a solenoid valve 5, an evaporator 6, and a four-way valve 7. The input end of each evaporator 6 is connected to the air cooler inlet branch 16. The expansion valve 3 is installed in the air cooler inlet branch 16. The interface of the air cooler inlet branch 16 is connected to the high-pressure liquid pipe 2. A fan 4 is installed on one side of the evaporator 6. The outlet of the evaporator 6 is connected to the fourth branch E of the four-way valve 7 through the air cooler outlet branch 17. The valve body in this embodiment can be a solenoid valve or other valve body that can achieve the same function.

[0030] The first branch D of the four-way valve 7 is connected to the defrost high-pressure gas pipe 9 through the defrost branch 15. The inlet of the defrost high-pressure gas pipe 9 is connected to the high-pressure gas pipeline 13 between the inlet of the condenser 1 and the outlet of the oil separator 12. The inlet of the oil separator 12 is connected to the exhaust port of the compressor 11. The bottom of the oil separator 12 is connected to the capillary 19 through a pipeline. The capillary 19 is connected to the air inlet of the gas-liquid separator 10 through a pipeline. The outlet of the gas-liquid separator 10 is connected to the air intake port of the compressor 11.

[0031] The second branch C of the four-way valve 7 is connected to the solenoid valve 5 through the drain circuit 14, the liquid outlet of the solenoid valve 5 is connected to the air cooler inlet branch 16, the third branch S of the four-way valve 7 is connected to the low-pressure gas pipe 8 through the low-pressure gas pipe branch 18, and the end of the low-pressure gas pipe 8 is connected to the air inlet pipe of the gas-liquid separator 10. Through the switching of the four-way valve 7 and the cooperation of the defrosting high-pressure gas pipe 9, the defrosting function and the normal refrigeration operation function can be realized. Through the cooperation of the solenoid valve 5 and the drain circuit 14, the accumulated liquid in the defrosting high-pressure gas pipe 9 can be drained before defrosting to ensure the normal operation of the system during defrosting.

[0032] In the above scheme, in the refrigeration mode, the four-way valve 7 is connected to the air cooler outlet branch 17 and the low-pressure gas pipe branch 18, and the defrost branch 15 is connected to the drain circuit 14, and the solenoid valve 5 is in a closed state; the four-way valve 7 is provided with a defrost preparation stage before the defrost mode, and the four-way valve 7 is connected in the same manner as in the refrigeration mode, and the solenoid valve 5 is in an open state; in the defrost mode, the four-way valve 7 is connected to the air cooler outlet branch 17 and the defrost branch 15, and the drain circuit 14 is connected to the low-pressure gas pipe branch 18, and the solenoid valve 5 is in a closed state.

[0033] like Figure 3 and Figure 4 As shown, the four-way valve 7 includes the following components: the electromagnetic pilot valve 21 is composed of a signal tube 21.1, a pilot valve slide valve 21.2 and a pilot valve spring 21.3; the pneumatic four-way valve 22 is composed of a right cylinder 22.1, a left cylinder 22.2 and a pneumatic slide valve 22.3. The pneumatic four-way valve 26 has four interfaces, namely, the first branch D, the second branch C, the third branch S and the fourth branch E, and a slide valve that can move left and right is arranged in the valve body. When the pressure of the left cavity of the slide valve is less than the pressure of the right cavity, the slide valve is located on the left side, the first branch D is connected to the second branch C, and the fourth branch E is connected to the third branch S; when the pressure of the left cavity of the slide valve is greater than the pressure of the right cavity, the slide valve is located on the right side, the first branch D is connected to the fourth branch E, and the second branch C is connected to the third branch S. Among them, the opening and closing of the electromagnetic pilot valve causes a pressure difference at both ends of the main valve slide valve, which pushes the slide valve to move and realizes the switching of the main valve state.

[0034] Figure 3It is the valve connection state of the air cooler in the refrigeration mode and the defrost and drain mode. Among them, the solenoid pilot valve is located on the left. At this time, the pressure of the cavity on the left side of the sliding valve is low-pressure gas pressure, and the pressure of the cavity on the right side is high-pressure gas pressure. The pressure on the left side of the sliding valve is less than the pressure on the right side of the cavity. The sliding valve is located on the left side, and the fourth branch E is connected to the third branch S, and the first branch D is connected to the second branch C, that is, the defrost branch 15 is connected to the drain circuit 14, and the air cooler outlet branch 17 is connected to the low-pressure gas pipe branch 18. At this time, the system is cooling normally. If the solenoid valve 5 is opened at this time, the system operates in the defrost preparation mode.

[0035] Figure 4 It is the valve connection state of the air cooler in defrost mode. Among them, the electromagnetic pilot valve is located on the right. At this time, the pressure of the left cavity of the sliding valve is high-pressure gas pressure, and the pressure of the right cavity is low-pressure gas pressure. The pressure of the left cavity of the sliding valve is greater than that of the right cavity. The sliding valve is located on the right side, and the first branch D is connected to the fourth branch E, and the third branch S is connected to the second branch C, that is, the defrost branch 15 is connected to the outlet branch 17 of the air cooler, and the drain circuit 14 is connected to the low-pressure gas branch 18. At this time, the system operates according to the defrost condition.

[0036] As a preferred solution, a water collecting pan may be connected to the low-pressure gas pipe branch 18, and an antifreeze coil 20 may be provided in the water collecting pan. The output end of the antifreeze coil 20 is connected to the liquid inlet of the solenoid valve 5 to prevent the water collecting pan from freezing.

[0037] A multi-connected cold storage air cooler system, the system includes a multi-connected cold storage air cooler as described in any one of the above schemes, and also includes an associated terminal connected to the multi-connected cold storage air cooler, the associated terminal can adopt a PL second branch C control system or a host computer, a central control system. This case gives a single-stage compression cycle with a recooling circuit, the system can also be changed to a "single-stage compression system without a recooling circuit", "a two-stage compression system with intermediate cooling", "a two-stage compression system without intermediate cooling", "a quasi-two-stage compression system with intermediate air replenishment", etc. The multi-connected refrigeration system can also be a single-stage compression cycle or a two-stage compression cycle. The four-way valve of the multi-connected refrigeration system can be a third branch STF type air conditioning electromagnetic four-way valve, or it can be other four-way valves that perform the same function.

[0038] In the refrigeration mode, the refrigerant that has released heat and cooled down through the condenser 1 in the refrigeration cycle passes through the high-pressure liquid pipe 2, and then enters each air cooler. It passes through the air cooler inlet branch 16, is throttled and depressurized by the expansion valve 3, and then passes through the evaporator 6 and vaporizes under the action of the fan 4. It enters the four-way valve 7 through the air cooler outlet branch 17. At this time, the connection mode of the four-way valve 7 is: the defrost branch 15 is connected to the drain circuit 14, and the air cooler outlet branch 17 is connected to the low-pressure gas pipe branch 18. Thus, the low-pressure liquid enters the low-pressure gas pipe branch 18 and merges into the low-pressure gas pipe 8. Then it enters the gas-liquid separator 10, enters the oil separator 12 after being compressed by the compressor 11, and the lubricating oil returns to the compressor 11 through the capillary 19 after throttling and depressurization. At this time, part of the refrigerant liquid enters the high-pressure gas pipeline 13 and enters the condenser 1 again to release heat and liquefy. The other part enters the defrost high-pressure gas pipe 9, enters the four-way valve 7 through the defrost branch 15, and then enters the drain circuit 14. At this time, the solenoid valve 5 is closed, so there is no refrigerant flow in this branch, and only gaseous refrigerant remains in the pipe. After a certain period of time, this section of refrigerant will further liquefy.

[0039] In the defrost and drain mode, the refrigeration cycle is consistent with the normal refrigeration mode. The refrigerant that releases heat and cools down through the condenser 1 passes through the high-pressure liquid pipe 2, and then enters each air cooler. After throttling and reducing pressure through the expansion valve 3, it passes through the evaporator 6 and enters the four-way valve 7. At this time, the four-way valve remains unchanged. The connection method is still: the defrost branch 15 is connected to the drain circuit 14, and the air cooler outlet branch 17 is connected to the low-pressure gas pipe branch 18. The refrigerant enters the gas-liquid separator 10, enters the oil separator 12 after being compressed by the compressor, and then enters the high-pressure gas pipeline 13 and the defrost high-pressure gas pipe 9 respectively. At this time, the air cooler to be defrosted opens the corresponding solenoid valve 5, and the refrigerant enters the defrost high-pressure gas pipe 9. Since the solenoid valve 5 is opened, the refrigerant in this branch circulates. The high-pressure refrigerant vapor will quickly enter the defrost branch 15 and mix with the liquid refrigerant, enter the drain circuit 14, throttle and reduce pressure through the solenoid valve 5, flow into the high-pressure liquid pipe 2, and enter the air cooler that is working normally.

[0040] In the defrost mode, the refrigeration cycle of the non-defrosting air cooler remains the same as that in the normal refrigeration mode. The defrosting of the air cooler is carried out according to the following process: The high-temperature and high-pressure gaseous refrigerant compressed by the compressor 11 enters the high-temperature high-pressure gas pipeline 13 and then enters the condenser 1 to release heat and cool down; Another part enters the high-temperature defrost high-pressure gas pipe 9. For the air cooler that needs defrosting, the four-way valve 7 switches, and the connection method at this time is: The defrost branch 15 is connected to the air cooler outlet branch 17, and the liquid discharge circuit 14 is connected to the low-pressure gas pipe branch 18. The solenoid valve 5 is closed, so only low-pressure gaseous refrigerant is stored in the liquid discharge circuit 14 and there is no refrigerant flow. The high-pressure gas entering the four-way valve 7 from the defrost branch 15 releases heat and liquefies through the evaporator 6. At this time, the expansion valve 3 is fully open, and the high-pressure refrigerant liquid directly enters the high-pressure liquid pipe 2 through the air cooler inlet branch 16. It converges with the high-pressure liquid refrigerant in the condenser and then enters the normal working air cooler to work normally.

[0041] It should be noted that in the above solution, when the multi-connected cold storage air cooler system is operating in the defrost liquid discharge mode and the defrost mode, 1 to m (m < n) groups of the multi-group air coolers (a total of n groups) operate in the defrost liquid discharge mode and the defrost mode, and the remaining air coolers operate in the normal refrigeration mode to ensure the normal operation of the system and achieve uninterrupted refrigeration. And when the air cooler operates in the defrost liquid discharge mode and the defrost mode, it must first operate in the defrost liquid discharge mode and then in the defrost mode.

[0042] This patent realizes the switching among the normal refrigeration mode, the defrost liquid discharge mode and the defrost mode by setting the four-way valve 7, the liquid discharge circuit 14 and the solenoid valve 5. Among them, there is a defrost liquid discharge mode before the defrost mode, which can avoid the gaseous refrigerant in the defrost high-pressure gas pipe from becoming liquid refrigerant, avoid valve liquid accumulation during mode switching, and thus be difficult to control. Therefore, the "water hammer" phenomenon will not occur to damage the system, and uninterrupted refrigeration can also be achieved to ensure the quality and safety of cold storage and freezing.

[0043] This patent improves the reliability of the refrigeration system during operation and avoids the influence on the quality of cold storage and frozen products due to the increase in the temperature in the warehouse during defrosting. In addition, when in the defrost mode, the evaporator 6 is converted into the condenser 1 of the refrigeration system, which ensures the speed and effect of defrosting and improves the refrigeration efficiency during defrosting.

[0044] The above-mentioned specific implementation manners have further elaborated on the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above is only the specific implementation manner of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-connected cold storage air cooler, characterized in that: It comprises a compression condensing unit and a cooling air machine module, wherein the compression condensing unit comprises a condenser (1), a gas-liquid separator (10), a compressor (11) and an oil separator (12), wherein the outlet of the condenser (1) is respectively connected to a plurality of cooling air machine modules via a high-pressure liquid pipe (2); The air cooler module comprises an expansion valve (3), a solenoid valve (5), an evaporator (6), and a four-way valve (7); the input end of each evaporator (6) is connected to an air cooler inlet branch (16); the expansion valve (3) is installed in the air cooler inlet branch (16); the interface of the air cooler inlet branch (16) is connected to the high-pressure liquid pipe (2); a fan (4) is installed on one side of the evaporator (6); and the outlet of the evaporator (6) is connected to the fourth branch of the four-way valve (7) via the air cooler outlet branch (17); The first branch of the four-way valve (7) is connected to the defrost high-pressure gas pipe (9) via the defrost branch (15); the inlet of the defrost high-pressure gas pipe (9) is connected to the high-pressure gas pipeline (13) between the inlet of the condenser (1) and the outlet of the oil separator (12); the inlet of the oil separator (12) is connected to the exhaust port of the compressor (11); the bottom of the oil separator (12) is connected to the air inlet of the gas-liquid separator (10) via a capillary tube (19); and the outlet of the gas-liquid separator (10) is connected to the air intake port of the compressor (11); The second branch of the four-way valve (7) is connected to the electromagnetic valve (5) via a liquid discharge circuit (14); the liquid outlet of the electromagnetic valve (5) is connected to the air cooler inlet branch (16); the third branch of the four-way valve (7) is connected to the low-pressure gas pipe (8) via a low-pressure gas pipe branch (18); the end of the low-pressure gas pipe (8) is connected to the air inlet pipe of the gas-liquid separator (10); The compression condensing unit is any one of air-cooled, water-cooled, and refrigerant-cooled; the compressor (11) is one or a combination of a speed-controllable compressor, a gas-flow-adjustable compressor, and a fixed-speed compressor.

2. A multi-connected cold storage air cooler according to claim 1, characterized in that: When the four-way valve (7) is in the cooling mode, the outlet branch (17) of the air cooler is connected to the low-pressure gas pipe branch (18), and the defrost branch (15) is connected to the drain circuit (14), and the solenoid valve (5) is in a closed state; when the four-way valve (7) is in the defrost mode, a defrost preparation stage is provided, and the connection method of the four-way valve (7) is the same as that in the cooling mode, and the solenoid valve (5) is in an open state; when the four-way valve (7) is in the defrost mode, the outlet branch (17) of the air cooler is connected to the defrost branch (15), and the drain circuit (14) is connected to the low-pressure gas pipe branch (18), and the solenoid valve (5) is in a closed state.

3. The multi-connected cold storage air cooler according to claim 1, characterized in that: The drainage circuit (14) is connected to an antifreeze coil (20) of a water collecting pan, and an input end of the antifreeze coil (20) is connected to a second branch of the solenoid valve (5).

4. A multi-connected cold storage air cooler system, characterized in that: The system comprises a multi-connected cold storage air cooler as described in any one of claims 1 to 3, and also comprises an associated terminal connected to the multi-connected cold storage air cooler.

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