Refrigerating system for hot fluorine defrosting

Abstract

The utility model discloses a hot fluorine defrosting refrigerating system which comprises an evaporator, a compressor, an oil separator and a water-cooling condenser, the evaporator can selectively work in a refrigerating state or a defrosting state, the oil separator is arranged between the compressor and the water-cooling condenser, an exhaust port of the compressor is communicated with the oil separator, and an exhaust port of the compressor is communicated with the water-cooling condenser. The compressor and the water cooling condenser are communicated with the evaporator through pipelines, the four-way valve comprises four openings, and the four openings are defined as a first opening, a second opening, a third opening and a fourth opening; the first opening is communicated with an air outlet of the oil separator, the second opening is communicated with the water-cooling condenser, the third opening is communicated with an air inlet of the compressor, and the fourth opening is communicated with the evaporator, so that the four-way valve can change the flow direction of a refrigerant of the refrigerating system, the gaseous refrigerant is liquefied through the evaporator to release heat, and hot fluorine defrosting is achieved. No extra electric heating tube is needed for defrosting, electric energy is saved, the temperature variation amplitude of the refrigeration house is small, and articles stored in the refrigeration house cannot be affected.

Description

Technical Field

[0001] The utility model belongs to the technical field of air conditioners, and in particular relates to a refrigeration system for hot fluorine defrosting. Background Art

[0002] As an important component of the cold storage refrigeration system, the air cooler begins to frost on the evaporator surface when the evaporation temperature of the air cooler is lower than 0℃ and lower than the air dew point. For an existing cold storage, the sealing of the cold storage determines the speed of frosting of the air cooler, because the worse the sealing, the more humid air leaks into the storage, and then the air dew point temperature in the storage will be higher, and the air cooler will frost faster.

[0003] If the evaporator is frosted, the frost will hinder the conduction and dissipation of cold energy in the refrigeration evaporator (pipeline), affecting the refrigeration effect. When the thickness of the frost layer (ice layer) on the surface of the evaporator reaches a certain level, the refrigeration efficiency will drop rapidly. In severe cases, there will be no refrigeration, which will not only lead to a large waste of electricity and shorten the service life of the refrigeration system, but also affect the normal use of the cold storage, thereby affecting the quality and safety of stored medicines.

[0004] Common defrosting methods currently used in refrigeration systems include manual defrosting and electric defrosting. Manual defrosting is a method in which the operator directly removes condensed frost on the surface of the evaporator with a cleaning tool. It is generally only applicable to the defrosting of wall and roof pipes in frozen cold storages and cannot be applied to other scenarios. Electric defrosting is to insert an electric heating tube into the evaporator coil, and the air cooler must be stopped during defrosting. Electric defrosting is convenient, simple to operate, and easy to achieve automatic control. However, this method consumes more electricity and the temperature of the cold storage fluctuates greatly. Utility Model Content

[0005] The utility model aims to provide a refrigeration system for hot fluorine defrosting to at least solve one of the above technical problems.

[0006] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0007] A refrigeration system for hot fluorine defrosting, comprising:

[0008] An evaporator, the evaporator is used to absorb heat through evaporation and reduce the temperature of the gas;

[0009] compressors, oil separators and water-cooled condensers;

[0010] The evaporator can selectively operate in a refrigeration state or a defrosting state;

[0011] The oil separator is arranged between the compressor and the water-cooled condenser, the exhaust port of the compressor is communicated with the oil separator, and the compressor and the water-cooled condenser are communicated with the evaporator through a pipeline;

[0012] A gas-liquid separator, wherein the outlet of the gas-liquid separator is connected to the outlet of the oil separator via a first solenoid valve;

[0013] A four-way valve, the four-way valve comprising four openings, wherein the four openings are defined as a first opening, a second opening, a third opening and a fourth opening;

[0014] The first opening is connected to the air outlet of the oil separator, the second opening is connected to the water-cooled condenser, the third opening is connected to the air inlet of the compressor, and the fourth opening is connected to the evaporator.

[0015] Through such an arrangement, the evaporator can selectively work in a refrigeration state or a defrosting state. The four-way valve can change the refrigerant flow direction of the refrigeration system of the utility model. The gaseous refrigerant is liquefied and releases heat through the evaporator to achieve hot fluorine defrosting. There is no need to introduce additional electric heating pipes for defrosting, which saves electricity. The temperature change of the cold storage is small and will not affect the items stored in the cold storage.

[0016] Preferably, it further comprises a gas-liquid separator, one end of the gas-liquid separator is connected to the air inlet of the compressor, and the other end of the gas-liquid separator is connected to the four-way valve.

[0017] Preferably, a second refrigeration ball valve is provided between the second opening and the water-cooled condenser, and when the compressor is overhauled, the valve of the second refrigeration ball valve is closed to prevent the refrigerant in the water-cooled condenser from leaking;

[0018] A needle valve is also provided between the second refrigeration ball valve and the water-cooled condenser for system vacuuming or refrigerant charging.

[0019] Preferably, the pipeline is used for circulating gas and / or liquid. When the evaporator works in a refrigeration state, the water-cooled condenser is connected to the exhaust port of the compressor through the four-way valve, and the evaporator is connected to the air inlet of the compressor through the four-way valve. The water-cooled condenser inputs liquid refrigerant to the evaporator through the pipeline, and the evaporator inputs gaseous refrigerant to the compressor through the pipeline.

[0020] When the evaporator operates in a defrosting state, the evaporator is connected to the exhaust port of the compressor through the four-way valve, the water-cooled condenser is connected to the air inlet of the compressor through the four-way valve, the compressor inputs gaseous refrigerant to the evaporator through the pipeline, and the evaporator inputs liquid refrigerant to the water-cooled condenser.

[0021] Preferably, it also includes a two-way liquid reservoir, which is arranged on the pipeline between the water-cooled condenser and the evaporator and is used to store liquid refrigerant.

[0022] Preferably, the water-cooled condenser is provided with at least one external water inlet pipe and at least one external water outlet pipe, and the water inlet pipe and the water outlet pipe are in communication with the water-cooled condenser.

[0023] Preferably, it further comprises two thermal expansion valves, wherein the two thermal expansion valves are defined as a first thermal expansion valve and a second thermal expansion valve respectively;

[0024] The first thermal expansion valve is disposed on the pipeline between the evaporator and the water-cooled condenser, and is used to adjust the flow rate of liquid refrigerant flowing from the evaporator into the water-cooled condenser;

[0025] The second thermal expansion valve is also arranged on the pipeline between the evaporator and the water-cooled condenser, and is used to adjust the flow rate of liquid refrigerant flowing from the water-cooled condenser into the evaporator;

[0026] The first thermal expansion valve and the second thermal expansion valve are arranged in different branches of the pipeline, and the two do not work at the same time.

[0027] More preferably, it also includes:

[0028] a first one-way valve, the first one-way valve being located in the branch where the first thermal expansion valve is located, and being used for allowing the refrigerant to flow from the evaporator to the water-cooled condenser in one direction;

[0029] a second one-way valve, wherein the branch where the second one-way valve is located is connected in parallel with the branch where the first one-way valve and the first thermal expansion valve are located, and is used to allow the refrigerant to flow from the water-cooled condenser to the evaporator in one direction;

[0030] a third one-way valve, the third one-way valve being located in the branch where the second thermal expansion valve is located, and being used for allowing the refrigerant to flow from the water-cooled condenser to the evaporator in one direction;

[0031] A fourth one-way valve, wherein the branch where the fourth one-way valve is located is connected in parallel with the branch where the third one-way valve and the second thermal expansion valve are located, is used to allow the refrigerant to flow from the evaporator to the water-cooled condenser in one direction.

[0032] Preferably, a drying filter is further included, wherein the drying filter is arranged on the pipeline between the two-way liquid reservoir and the evaporator and is used for absorbing moisture and filtering impurities.

[0033] Preferably, it also includes a plurality of pressure relays, and the plurality of pressure relays are used to control the start and stop of the compressor.

[0034] Beneficial effects:

[0035] The utility model provides a refrigeration system with hot fluorine defrosting, comprising an evaporator, a compressor, an oil separator and a water-cooled condenser. The evaporator is used for evaporating and absorbing heat to reduce the temperature of the gas. The evaporator can selectively work in a refrigeration state or a defrosting state. The oil separator is arranged between the compressor and the water-cooled condenser. The exhaust port of the compressor is connected with the oil separator. The compressor and the water-cooled condenser are connected with the evaporator through a pipeline. The utility model also comprises a four-way valve. The four-way valve comprises four openings, and the four openings are defined as a first opening, a second opening, a third opening and a fourth opening respectively; the first opening is connected with the air outlet of the oil separator, the second opening is connected with the water-cooled condenser, the third opening is connected with the air inlet of the compressor, and the fourth opening is connected with the evaporator. With such arrangement, the four-way valve can change the refrigerant flow direction of the refrigeration system of the utility model, the gaseous refrigerant is liquefied and releases heat through the evaporator, and hot fluorine defrosting is realized. There is no need to introduce an additional electric heating pipe for defrosting, thereby saving electric energy, and the temperature variation of the cold storage is small, which will not affect the items stored in the cold storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the refrigeration system of the embodiment of the utility model;

[0037] Figure 2 This is a schematic diagram of the working principle of the refrigeration system in the refrigeration state of the embodiment of the utility model;

[0038] Figure 3 It is a schematic diagram of the working principle of the refrigeration system in the defrosting state of an embodiment of the utility model.

[0039] Reference numerals

[0040] 1- compressor; 2- exhaust temperature protector; 3- oil separator; 4- first solenoid valve; 5- gas-liquid separator; 6- four-way valve; 7- high pressure gauge; 8- single high pressure relay; 9- high and low pressure relay; 10- low pressure gauge; 11- single low pressure relay; 12- first refrigeration ball valve; 13- second refrigeration ball valve; 14- needle valve; 15- water-cooled condenser; 16- first thermal expansion valve; 17- second solenoid valve; 18- first check valve; 19- second check valve; 20- two-way liquid storage tank; 21- drying filter; 22- sight glass; 23- third refrigeration ball valve; 24- third check valve; 25- third solenoid valve; 26- second thermal expansion valve; 27- fourth check valve; 28- evaporator. DETAILED DESCRIPTION

[0041] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0042] The technical solution of the utility model is described in detail below with specific embodiments.

[0043] See also Figure 1 The utility model discloses a refrigeration system for hot fluorine defrosting, which includes three parts: I, II and III. Part I is an air cooler placed in a cold storage, and part III is a rack. The air cooler and the rack are connected by a pipe in part II.

[0044] Specifically, the air cooler includes an evaporator 28, a compressor 1, an oil separator 3 and a water-cooled condenser 15 are arranged on the frame, the evaporator 28 is used for evaporation and heat absorption to reduce the gas temperature, the evaporator 28 can selectively work in a refrigeration state or a defrosting state, the oil separator 3 is arranged between the compressor 1 and the water-cooled condenser 15, the exhaust port of the compressor 1 is connected to the oil separator 3, the compressor 1 and the water-cooled condenser 15 are connected to the evaporator 28 through a pipeline, the frame is also provided with a gas-liquid separator 5 and a four-way valve 6, the gas-liquid separator 5 is connected to the outlet of the oil separator 3 through a first solenoid valve 4, and the four-way valve 6 includes four openings, which are defined as a first opening, a second opening, a third opening and a fourth opening; the first opening is connected to the air outlet of the oil separator 3, the second opening is connected to the water-cooled condenser 15, the third opening is connected to the air inlet of the compressor 1, and the fourth opening is connected to the evaporator 28. With this arrangement, the four-way valve 6 can change the refrigerant flow direction of the refrigeration system of the utility model, and the gaseous refrigerant is liquefied and releases heat through the evaporator 28 to achieve hot fluorine defrosting. There is no need to introduce additional electric heating pipes for defrosting, which saves electricity, and the temperature change of the cold storage is small, which will not affect the items stored in the cold storage.

[0045] Furthermore, the refrigeration system of this embodiment also includes a gas-liquid separator 5, one end of the gas-liquid separator 5 is connected to the air inlet of the compressor 1, and the other end is connected to the four-way valve 6. When the evaporator 28 is in the refrigeration state or the defrost state, the gas-liquid separator 5 can protect the compressor 1 when the refrigerant liquid returns. Specifically, the protection is achieved by separating and preserving the refrigerant liquid in the return air pipe. The gas-liquid separator 5 provides additional internal volume for the low-pressure side of the refrigeration system, which can temporarily store excess refrigerant liquid and also prevents excess refrigerant from flowing into the crankcase of the compressor 1 to cause oil dilution.

[0046] The refrigeration system of the embodiment of the utility model also includes a plurality of pressure relays, which directly control the start and stop of the compressor 1, specifically including a single high-pressure relay 8, a high-low pressure relay 9 and a single low-pressure relay 11. At the same time, the branch where the pressure relay is located is also connected to a high-pressure gauge 7 and a low-pressure gauge 10. Specifically, in this embodiment, the high-pressure protection pressure of the high-low pressure relay 9 is set to 25 bar, and the low-pressure protection pressure is set to 0.5 bar. The single high-pressure relay 8 is set to 22 bar, and the single low-pressure relay 11 is set to 4.5 bar.

[0047] Furthermore, the pipelines of this embodiment are used to circulate gas and / or liquid, and there is no need to set up separate gas pipelines and liquid pipelines, which greatly improves the utilization rate of the pipelines. When the evaporator 28 is working in the refrigeration state, the water-cooled condenser 15 is connected to the exhaust port of the compressor 1 through the four-way valve 6, and the evaporator 28 is connected to the air inlet of the compressor 1 through the four-way valve 6. The water-cooled condenser 15 inputs liquid refrigerant to the evaporator 28 through the pipeline, and the evaporator 28 inputs gaseous refrigerant to the compressor 1 through the pipeline; when the evaporator 28 is working in the defrosting state, the evaporator 28 is connected to the exhaust port of the compressor 1 through the four-way valve 6, and the water-cooled condenser 15 is connected to the air inlet of the compressor 1 through the four-way valve 6. The compressor 1 inputs gaseous refrigerant to the evaporator 28 through the pipeline, and the evaporator 28 inputs liquid refrigerant to the water-cooled condenser 15.

[0048] Specifically, an exhaust temperature protector 2 is further provided between the compressor 1 and the four-way valve 6 of the present embodiment. When the refrigeration system lacks refrigerant or the filter screen of the return air pipe of the compressor 1 is dirty and clogged, etc., the exhaust temperature of the compressor 1 will increase. When the exhaust temperature exceeds a preset value, the exhaust temperature protector 2 will reduce the frequency or shut down the compressor 1 to protect the compressor. A first refrigeration ball valve 12 is provided between the third opening of the four-way valve 6 of the present embodiment and the gas-liquid separator 5, and a second refrigeration ball valve 13 is provided between the second opening of the four-way valve 6 and the water-cooled condenser 15. When the compressor 1 or the air cooler is overhauled, the valve of the second refrigeration ball valve 13 is closed to prevent the refrigerant in the water-cooled condenser 15 from leaking. A needle valve 14 is also provided between the second refrigeration ball valve 13 and the water-cooled condenser 15 for vacuuming the system or filling the refrigerant. The water-cooled condenser 15 is provided with at least one external water inlet pipe and at least one external water outlet pipe, such as Figure 1 As shown, A is the water inlet pipe and B is the water outlet pipe.

[0049] Furthermore, the refrigeration system of the present embodiment further comprises two thermal expansion valves, which are defined as a first thermal expansion valve 16 and a second thermal expansion valve 26; the first thermal expansion valve 16 is arranged on the pipeline between the evaporator 28 and the water-cooled condenser 15, and is used to adjust the flow rate of liquid refrigerant flowing from the evaporator 28 to the water-cooled condenser 15; the second thermal expansion valve 26 is also arranged on the pipeline between the evaporator 28 and the water-cooled condenser 15, and is used to adjust the flow rate of liquid refrigerant flowing from the water-cooled condenser 15 to the evaporator 28; the first thermal expansion valve 16 and the second thermal expansion valve 26 are arranged on different branches of the pipeline, and the two do not work at the same time; and further comprises four one-way valves, which are defined as a first one-way valve 18, a second one-way valve 19, a third one-way valve 24 and a fourth one-way valve 27, the first one-way valve 18 is located in the branch where the first thermal expansion valve 16 is located, and is used to allow the refrigerant to flow from the evaporator 28 to the water-cooled condenser 15 in one direction; the branch where the second one-way valve 19 is located is connected in parallel with the branch where the first one-way valve 18 and the first thermal expansion valve 16 are located, and is used to allow the refrigerant to flow from the water-cooled condenser 15 to the evaporator 28 in one direction; the third one-way valve 24 is located in the branch where the second thermal expansion valve 26 is located, and is used to allow the refrigerant to flow from the water-cooled condenser 15 to the evaporator 28 in one direction; the branch where the fourth one-way valve 27 is located is connected in parallel with the branch where the third one-way valve 24 and the second thermal expansion valve 26 are located, and is used to allow the refrigerant to flow from the evaporator 28 to the water-cooled condenser 15 in one direction. It also includes a two-way liquid reservoir 20 and a drying filter 21. The two-way liquid reservoir 20 is arranged on the pipeline between the water-cooled condenser 15 and the evaporator 28 for storing liquid refrigerant; the drying filter 21 is arranged on the pipeline between the two-way liquid reservoir 20 and the evaporator 28 for absorbing moisture and filtering impurities.

[0050] Furthermore, a first solenoid valve 4 is provided on the pipeline between the oil separator 3 and the gas-liquid separator 5. The first solenoid valve 4 is connected for 2 seconds before the four-way valve 6 is actuated to balance the high and low pressures to ensure successful switching of the four-way valve; a second solenoid valve 17 is also provided on the branch where the first one-way valve 18 and the first thermal expansion valve 16 are located, and a third solenoid valve 25 is also provided on the branch where the third one-way valve 24 and the second thermal expansion valve 26 are located. In the cooling state, the third solenoid valve 25 is opened and the second solenoid valve 17 is closed. In the defrosting state, the third solenoid valve 25 is closed and the second solenoid valve 17 is opened.

[0051] Preferably, the refrigeration system of this embodiment also includes a sight glass 22, which is arranged between the third one-way valve 24 and the dry filter 21. The sight glass 22 is a transparent wide-angle sight glass that can observe the liquid level and flow conditions of the refrigerant, and can also detect the working condition of the dry filter 21, including whether the water vapor content after drying meets the requirements, and whether the dry filter 21 is blocked after running for a period of time.

[0052] See also Figure 2 When the refrigeration system of the present embodiment is in a refrigeration state, the compressor 1 works, and the high-temperature gaseous refrigerant is discharged from its exhaust port, and enters the oil separator 3 through the exhaust temperature protector 2. The oil separator 3 separates the lubricating oil vapor and tiny oil particles entrained in the superheated vapor of the refrigerant. The separated gaseous refrigerant enters the inside of the four-way valve 6 through the first opening of the four-way valve 6, and then passes through the second opening and the second refrigeration ball valve 13 in sequence to enter the water-cooled condenser 15. Cold water is passed into the water-cooled condenser 15, and the gaseous refrigerant exchanges heat with the cold water in the water-cooled condenser 15, releases heat and becomes liquid refrigerant. The liquid refrigerant passes through the second one-way valve 19, the two-way liquid storage 20, the drying filter 21, the sight glass 22, the third The refrigeration ball valve 23, the third one-way valve 24, the third solenoid valve 25, and the second thermal expansion valve 26 enter the evaporator 28, and the liquid refrigerant evaporates and absorbs heat in the evaporator 28, forming a refrigeration effect on the external environment around the evaporator 28. Most of the liquid refrigerant absorbs heat and becomes gaseous refrigerant. It is understandable that when the frost on the air cooler is relatively serious, some refrigerant may not evaporate completely and still remain in liquid state. Most of the gaseous refrigerant together with a small part of the liquid refrigerant enters the four-way valve 6 through the fourth opening, and then flows into the gas-liquid separator 5 from the third opening. The gas-liquid separator 5 separates and stores the liquid refrigerant in the return air pipe. The gaseous refrigerant returns to the compressor 1 through the return air pipe. The compressor 1 compresses and heats up, and then repeats the above process.

[0053] See also Figure 3 When the refrigeration system of this embodiment is in the defrosting state, the compressor 1 works, and the high-temperature gaseous refrigerant is discharged from its exhaust port, and enters the oil separator 3 through the exhaust pipe. The oil separator 3 separates the lubricating oil vapor and tiny oil particles entrained in the superheated vapor of the refrigerant. The separated gaseous refrigerant enters the inside of the four-way valve 6 through the first opening of the four-way valve 6, and then enters the evaporator 28 through the fourth opening. The high-temperature gaseous refrigerant exchanges heat with the frost layer of the evaporator 28, effectively removing the condensed frost on the surface of the evaporator 28, and the gaseous refrigerant releases heat to become liquid refrigerant. The refrigerant passes through the first opening of the four-way valve 6 and then enters the evaporator 28. The refrigerant passes through the fourth one-way valve 27, the third refrigeration ball valve 23, the sight glass 22, the drying filter 21, the two-way liquid storage tank 20, the first one-way valve 18, the second solenoid valve 17, and the first thermal expansion valve 16 into the water-cooled condenser 15. Hot water is introduced into the water-cooled condenser 15. The refrigerant exchanges heat with the hot water in the water-cooled condenser 15. The refrigerant absorbs heat and becomes gaseous. The gaseous refrigerant passes through the second refrigeration ball valve 13 and the second opening into the four-way valve 6, and then enters the gas-liquid separator 5 through the third opening and then returns to the compressor 1 through the return air pipe. The compressor 1 compresses and heats up, and the above process is repeated.

[0054] The implementation method described in this embodiment is applied to a water-cooled refrigeration system. It can be understood that it can also be applied to an air-cooled refrigeration system. The principle is the same and will not be further elaborated here.

[0055] In summary, the utility model provides a refrigeration system for hot fluorine defrosting, including an air cooler and a frame connected to each other, the air cooler including an evaporator 28, a compressor 1, an oil separator 3 and a water-cooled condenser 15 are arranged on the frame, the evaporator 28 is used for evaporation and heat absorption to reduce the gas temperature, the evaporator 28 can selectively work in a refrigeration state or a defrosting state, the oil separator 3 is arranged between the compressor 1 and the water-cooled condenser 15, the exhaust port of the compressor 1 is connected to the oil separator 3, the compressor 1 and the water-cooled condenser 15 are connected to the evaporator 28 through a pipeline, and a four-way valve 6 is also arranged on the frame, and the four The four-way valve 6 includes four openings, which are defined as a first opening, a second opening, a third opening and a fourth opening; the first opening is connected to the air outlet of the oil separator 3, the second opening is connected to the water-cooled condenser 15, the third opening is connected to the air inlet of the compressor 1, and the fourth opening is connected to the evaporator 28. With such an arrangement, the four-way valve 6 can change the refrigerant flow direction of the refrigeration system of the utility model, and the gaseous refrigerant is liquefied and releases heat through the evaporator 28 to achieve hot fluorine defrosting. There is no need to introduce additional electric heating pipes for defrosting, which saves electricity, and the temperature change of the cold storage is small, which will not affect the items stored in the cold storage.

[0056] The above is a detailed description of an embodiment of a refrigeration system with hot fluorine defrosting provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A refrigeration system with hot fluorine defrosting, characterized in that: include: an evaporator (28), the evaporator (28) being used for evaporating and absorbing heat to reduce the temperature of the gas; A compressor (1), an oil separator (3) and a water-cooled condenser (15); The evaporator (28) can selectively operate in a refrigeration state or a defrosting state; The oil separator (3) is arranged between the compressor (1) and the water-cooled condenser (15); the exhaust port of the compressor (1) is in communication with the oil separator (3); and the compressor (1) and the water-cooled condenser (15) are in communication with the evaporator (28) via a pipeline; A gas-liquid separator (5), wherein the gas-liquid separator (5) is connected to an outlet of the oil separator (3) via a first solenoid valve (4); A four-way valve (6), the four-way valve (6) comprising four openings, wherein the four openings are defined as a first opening, a second opening, a third opening and a fourth opening; The first opening is connected to the air outlet of the oil separator (3), the second opening is connected to the water-cooled condenser (15), the third opening is connected to the air inlet of the compressor (1), and the fourth opening is connected to the evaporator (28).

2. A refrigeration system for hot fluorine defrosting according to claim 1, characterized in that: One end of the gas-liquid separator (5) is connected to the air inlet of the compressor (1), and the other end is connected to the four-way valve (6).

3. A refrigeration system with hot fluorine defrosting according to claim 1, characterized in that: A second refrigeration ball valve (13) is provided between the second opening and the water-cooled condenser (15); when the compressor (1) is overhauled, the valve of the second refrigeration ball valve (13) is closed to prevent leakage of refrigerant in the water-cooled condenser (15); A needle valve (14) is also provided between the second refrigeration ball valve (13) and the water-cooled condenser (15) for system vacuuming or refrigerant charging.

4. A refrigeration system with hot fluorine defrosting according to claim 1, characterized in that: The pipeline is used for circulating gas and / or liquid. When the evaporator (28) is working in a refrigeration state, the water-cooled condenser (15) is connected to the exhaust port of the compressor (1) through the four-way valve (6), and the evaporator (28) is connected to the air inlet of the compressor (1) through the four-way valve (6). The water-cooled condenser (15) inputs liquid refrigerant to the evaporator (28) through the pipeline, and the evaporator (28) inputs gaseous refrigerant to the compressor (1) through the pipeline. When the evaporator (28) is operating in a defrosting state, the evaporator (28) is connected to the exhaust port of the compressor (1) through the four-way valve (6), the water-cooled condenser (15) is connected to the air inlet of the compressor (1) through the four-way valve (6), the compressor (1) inputs gaseous refrigerant to the evaporator (28) through the pipeline, and the evaporator (28) inputs liquid refrigerant to the water-cooled condenser (15).

5. A refrigeration system for hot fluorine defrosting according to claim 4, characterized in that: It also includes a two-way liquid storage device (20), which is arranged on the pipeline between the water-cooled condenser (15) and the evaporator (28) and is used to store liquid refrigerant.

6. A refrigeration system with hot fluorine defrosting according to claim 1, characterized in that: The water-cooled condenser (15) is provided with at least one external water inlet pipe and at least one external water outlet pipe, and the water inlet pipe and the water outlet pipe are in communication with the water-cooled condenser (15).

7. A refrigeration system with hot fluorine defrosting according to claim 1, characterized in that: It also includes two thermal expansion valves, which are defined as a first thermal expansion valve (16) and a second thermal expansion valve (26); The first thermal expansion valve (16) is disposed on the pipeline between the evaporator (28) and the water-cooled condenser (15) and is used to adjust the flow rate of liquid refrigerant flowing from the evaporator (28) to the water-cooled condenser (15); The second thermal expansion valve (26) is also arranged on the pipeline between the evaporator (28) and the water-cooled condenser (15), and is used to adjust the flow rate of the liquid refrigerant flowing from the water-cooled condenser (15) into the evaporator (28); The first thermal expansion valve (16) and the second thermal expansion valve (26) are arranged in different branches of the pipeline, and the two do not work at the same time.

8. A refrigeration system for hot fluorine defrosting according to claim 7, characterized in that: Also includes: a first one-way valve (18), the first one-way valve (18) being located in the branch where the first thermal expansion valve (16) is located, and being used to allow the refrigerant to flow from the evaporator (28) to the water-cooled condenser (15) in one direction; a second one-way valve (19), wherein the branch where the second one-way valve (19) is located is connected in parallel with the branch where the first one-way valve (18) and the first thermal expansion valve (16) are located, and is used to allow the refrigerant to flow from the water-cooled condenser (15) to the evaporator (28) in one direction; a third one-way valve (24), the third one-way valve (24) being located in the branch where the second thermal expansion valve (26) is located, and being used to allow the refrigerant to flow from the water-cooled condenser (15) to the evaporator (28) in one direction; A fourth one-way valve (27), wherein the branch where the fourth one-way valve (27) is located is connected in parallel with the branch where the third one-way valve (24) and the second thermal expansion valve (26) are located, and is used to allow the refrigerant to flow from the evaporator (28) to the water-cooled condenser (15) in one direction.

9. A refrigeration system for hot fluorine defrosting according to claim 5, characterized in that: It also includes a drying filter (21), which is arranged on the pipeline between the two-way liquid storage device (20) and the evaporator (28) and is used for absorbing moisture and filtering impurities.

10. A refrigeration system with hot fluorine defrosting according to claim 1, characterized in that: It also comprises a plurality of pressure relays, wherein the plurality of pressure relays are used to control the start and stop of the compressor (1).

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