Countercurrent hot fluorine defrosting and deicing system of refrigerating system

Abstract

The utility model discloses a countercurrent hot fluorine defrosting and deicing system of a refrigerating system, and belongs to the technical field of deicing and defrosting systems of refrigeration houses. The problems that in the hot fluorine defrosting process of an existing refrigeration house refrigerating system, the air supply pressure of a compressor is low, the liquid accumulation phenomenon is likely to happen, and the defrosting and deicing efficiency is affected are solved. A compressor is connected with a liquid supply pipe and a first evaporator through a compressor oil component, an expansion valve and a first one-way valve are arranged on a pipeline where the liquid supply pipe is connected with the first evaporator, the first evaporator is connected with a hot fluorine pipe and the compressor oil component, and the first evaporator is connected with a compressor gas component through a three-way change-over valve and a gas return pipe. A second one-way valve arranged on the liquid supply pipe is connected with the filter in parallel, the compressor is connected with the back pressure pipe through a pressure relief pipe, a defrosting pressurization electromagnetic valve is arranged on the pressure relief pipe, and an air supplementing pipe is connected between the air return pipe and the liquid supply pipe. According to the countercurrent hot fluorine defrosting and deicing system of the refrigerating system, the defrosting and deicing effect on the evaporator is improved, and meanwhile a certain protection effect on the compressor is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold storage deicing and defrosting systems, in particular to a countercurrent hot fluorine defrosting and deicing system for a refrigeration system. Background Art

[0002] Thermal fluorine defrost and ice removal technology in refrigeration systems is an effective method for removing frost or ice from refrigeration equipment, commonly used in cold storage, air conditioning, and heat pump systems. When cold storage equipment operates for extended periods, the evaporator surface temperature drops. When moist air comes into contact with the cooling surface, it condenses into frost or ice, affecting cooling efficiency and increasing energy consumption. Thermal fluorine defrost technology uses the heat in the refrigerant to accelerate the melting of frost and ice, maintaining efficient equipment operation.

[0003] The problem with the existing refrigeration system's hot fluorine defrost and de-icing system is that during the defrosting and de-icing process, the compressor's air supply pressure is low, the compressor cannot be properly inflated and replenished, and liquid accumulation is likely to occur. The defrosting efficiency is low and the compressor is easily damaged. In addition, if there are multiple groups of evaporators in the cold storage, when some of the evaporators are defrosted and de-iced, the liquid medium discharged from the defrosted and defrosted evaporator is mixed with gas, causing gas to appear in the liquid supply pipe of the refrigeration system, affecting the refrigeration effect of other refrigeration evaporators.

[0004] Therefore, the present application proposes a refrigeration system countercurrent hot fluorine defrosting and deicing system to solve the above problems. Utility Model Content

[0005] The purpose of developing this utility model is to solve the problem that the compressor air supply pressure of the existing cold storage refrigeration system is low during the hot fluorine defrosting process, which is prone to liquid accumulation and affects the defrosting and de-icing efficiency, and the problem that the liquid medium discharged from the evaporator for defrosting and de-icing is mixed with gas, resulting in the appearance of gas in the liquid supply pipe of the refrigeration system, affecting the refrigeration effect of other refrigeration evaporators. A brief overview of the utility model is given below to provide a basic understanding of certain aspects of the utility model. It should be understood that this overview is not an exhaustive overview of the utility model. It is not intended to identify the key or important parts of the utility model, nor is it intended to limit the scope of the utility model.

[0006] The technical solution of this utility model:

[0007] Option 1: Refrigeration system countercurrent hot fluorine defrosting and deicing system, including a compressor, a liquid supply pipe, a hot fluorine pipe, a return air pipe, a pressure relief pipe, an evaporative condenser, a liquid reservoir, a filter, a first evaporator and a three-way switching valve. The compressor is provided with a compressor oil separator and a compressor gas separator. The compressor oil separator is connected to the first evaporator through a liquid supply pipe. The liquid supply pipe is sequentially provided with a back pressure valve, an evaporative condenser, a liquid reservoir and a filter. An expansion valve and a first check valve are provided on the pipeline connecting the liquid supply pipe and the first evaporator. The expansion valve and the first check valve are connected in parallel. The first evaporator is connected to the hot fluorine pipe and the compressor oil separator through a three-way switching valve. The first evaporator is connected to the compressor gas separator through the three-way switching valve and the return air pipe. A second check valve is provided on the liquid supply pipe. The second check valve is arranged in parallel with the filter. The compressor gas separator is connected to the back pressure pipe through a pressure relief pipe. A defrost boost solenoid valve is provided on the pressure relief pipe. An air supply pipe is connected between the return air pipe and the liquid supply pipe.

[0008] Furthermore, the hot fluorine pipe is respectively provided with a hot fluorine solenoid valve and a second ball valve, the air supply pipe is provided with an air supply solenoid valve and a first ball valve, the liquid supply pipe is provided with a first solenoid valve, and the first solenoid valve is connected in parallel with the second one-way valve.

[0009] Furthermore, it also includes a second evaporator and a third evaporator, the second evaporator and the third evaporator are connected in parallel with the first evaporator, the second evaporator and the third evaporator are respectively connected to the liquid supply pipe, the pipelines connecting the second evaporator and the third evaporator to the liquid supply pipe are respectively provided with an expansion valve and a first one-way valve in parallel, the second evaporator and the third evaporator are respectively connected to the compressor oil part through a three-way conversion valve and a hot fluorine pipe, and the second evaporator and the third evaporator are respectively connected to the compressor gas part through a three-way conversion valve and a return air pipe.

[0010] Option 2: Refrigeration system countercurrent hot fluorine defrosting and de-icing system, including a compressor, a liquid supply pipe, a hot fluorine pipe, a return air pipe, a pressure relief pipe, an evaporative condenser, a liquid reservoir, a filter, a first evaporator, a three-way switching valve and a downpipe. The compressor is provided with a compressor oil separator and a compressor gas separator. The compressor oil separator is connected to the first evaporator through a liquid supply pipe. The liquid supply pipe is sequentially provided with a back pressure valve, an evaporative condenser, a liquid reservoir and a filter. An expansion valve is provided on the pipeline connecting the liquid supply pipe and the first evaporator. A first one-way valve is provided on the pipeline connecting the first evaporator and the downpipe. The other end of the downpipe is connected to the liquid reservoir. The first evaporator is connected to the hot fluorine pipe and the compressor oil separator through the three-way switching valve. The first evaporator is connected to the compressor gas separator through the three-way switching valve and the return air pipe. The compressor gas separator is connected to the back pressure pipe through the pressure relief pipe. A defrost boost solenoid valve is provided on the pressure relief pipe. An air supply pipe is connected between the return air pipe and the liquid supply pipe, and a third one-way valve is connected between the air supply pipe and the hot fluorine pipe.

[0011] Furthermore, the hot fluorine pipe is respectively provided with a hot fluorine solenoid valve and a second ball valve, the air supply pipe is provided with an air supply solenoid valve and a first ball valve, the liquid supply pipe is provided with a first solenoid valve, and the liquid drop pipe is provided with a stop valve.

[0012] Furthermore, a second solenoid valve is provided on the pipeline connecting the expansion valve and the liquid supply pipe, and a fourth one-way valve is provided between the expansion valve and the second solenoid valve.

[0013] Furthermore, it also includes a second evaporator, a third evaporator and a fourth evaporator, the second evaporator, the third evaporator and the fourth evaporator are connected in parallel, the second evaporator, the third evaporator and the fourth evaporator are respectively connected to an expansion valve and a first one-way valve, the expansion valve is connected in parallel with the first one-way valve, the expansion valve is connected to the liquid supply pipe, the first one-way valve is connected to the downpipe, the second evaporator, the third evaporator and the fourth evaporator are respectively connected to the hot fluorine pipe and the return air pipe through a three-way conversion valve.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the refrigeration system of the present invention, the countercurrent hot fluorine defrosting and deicing system is operated by a back pressure valve. During the defrosting and deicing process of some evaporators, the high-temperature and high-pressure gas generated by the compressor can directly enter the evaporator that needs to be defrosted and deiced through the hot fluorine pipe. The high-temperature and low-pressure liquid discharged from the evaporator after defrosting and deicing is converted into gas through the evaporative condenser, and then replenished into the compressor gas through the air replenishing pipe to replenish air to the compressor. During the defrosting and deicing process, the compressor is fully replenished with air, which improves the defrosting and deicing effect of the evaporator and will not affect the refrigeration efficiency of other evaporators that are being refrigerated. There will be no liquid accumulation in the compressor and the compressor will not be damaged.

[0016] 2. The countercurrent hot fluorine defrosting and deicing system of this utility model is also equipped with a liquid downpipe. Under the action of the liquid downpipe, the high-pressure, low-temperature liquid discharged from the evaporator undergoing defrosting and deicing is discharged into the liquid reservoir through the liquid downpipe. The liquid in the liquid reservoir enters the evaporator undergoing cooling through the liquid supply pipe to cool it. The gas in the liquid reservoir passes through the evaporative condenser and enters the air supply pipe, and then enters the compressor gas separator to replenish the compressor. After the liquid in the liquid reservoir enters the liquid supply pipe, it is ensured that there is no gas in the liquid supply pipe, preventing the problem of flash gas, thereby improving the cooling efficiency of the evaporator undergoing cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the countercurrent hot fluorine defrosting and deicing system of the refrigeration system;

[0018] Figure 2 This is a schematic diagram of a countercurrent hot fluorine defrosting and deicing system for a refrigeration system equipped with a downpipe;

[0019] Figure 3yes Figure 2 A partial schematic diagram of .

[0020] In the figure, 1- compressor, 2- compressor oil separator, 3- compressor gas separator, 4- back pressure valve, 5- liquid supply pipe, 6- hot fluorine pipe, 7- return air pipe, 8- pressure relief pipe, 9- evaporative condenser, 10- liquid reservoir, 11- filter, 12- first evaporator, 13- second evaporator, 14- third evaporator, 15- three-way switching valve, 16- expansion valve, 17- first one-way valve, 18- second one-way valve, 19- first solenoid valve, 20- defrost boost solenoid valve, 21- hot fluorine solenoid valve, 22- air supply solenoid valve, 23- first ball valve, 24- second ball valve, 25- third one-way valve, 26- stop valve, 27- liquid drop pipe, 28- second solenoid valve, 29- fourth evaporator, 30- fourth one-way valve, 31- air supply pipe. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments illustrated in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0022] The connections mentioned in this utility model are divided into fixed connections and detachable connections. The fixed connections (i.e., non-detachable connections) include but are not limited to conventional fixed connection methods such as hemming, rivet connection, bonding connection, and welding connection. The detachable connections include but are not limited to conventional detachable methods such as threaded connection, snap connection, pin connection, and hinge connection. When the specific connection method is not clearly specified, it is assumed that at least one connection method can always be found among the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example, a welded connection is selected for a fixed connection, and a hinge connection is selected for a detachable connection.

[0023] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] Example 1, combined Figure 1The present embodiment is described. The refrigeration system countercurrent hot fluorine defrosting and deicing system of the present embodiment includes a compressor 1, a liquid supply pipe 5, a hot fluorine pipe 6, a return air pipe 7, a pressure relief pipe 8, an evaporative condenser 9, a liquid reservoir 10, a filter 11, a first evaporator 12 and a three-way switching valve 15. The compressor 1 is provided with a compressor oil separator 2 and a compressor gas separator 3. The compressor oil separator 2 is connected to the first evaporator 12 through the liquid supply pipe 5. The liquid supply pipe 5 is provided with a back pressure valve 4, an evaporative condenser 9, a liquid reservoir 10 and a filter 11 in sequence. The pipeline connecting the liquid supply pipe 5 and the first evaporator 12 is provided with an expansion valve 16 and a first one-way valve 16. Valve 17, the expansion valve 16 is connected in parallel with the first one-way valve 17, the first evaporator 12 is connected to the hot fluorine pipe 6 and the compressor oil separator 2 through the three-way conversion valve 15, the first evaporator 12 is connected to the compressor gas separator 3 through the three-way conversion valve 15 and the return air pipe 7, a second one-way valve 18 is provided on the liquid supply pipe 5, the second one-way valve 18 is arranged in parallel with the filter 11, the compressor gas separator 3 is connected to the back pressure valve 4 through the pressure relief pipe 8, the pressure relief pipe 8 is provided with a defrost boost solenoid valve 20, and an air supply pipe 31 is connected between the return air pipe 7 and the liquid supply pipe 5; the evaporator is an existing evaporator equipment such as aluminum row or air cooler or iron pipe or copper pipe.

[0025] During refrigeration, the compressor 1 generates high-pressure and high-temperature gas, which passes through the compressor oil separator 2, the evaporative condenser 9, the liquid receiver 10 and the filter 11 in sequence, and then enters the expansion valve 16 on the first evaporator 12 for throttling, and then enters the first evaporator 12. The first evaporator 12 performs evaporative cooling. The medium discharged after evaporative cooling enters the compressor gas separator 3 through the return pipe 7 to replenish the compressor 1.

[0026] During hot fluorine defrosting and defrosting, the defrost boost solenoid valve 20 provided on the pressure relief pipe 8 connecting the back pressure valve 4 and the compressor gas part 3 is energized. When not energized, the defrost boost solenoid valve 20 is in a normally open state. After energization, the defrost boost solenoid valve 20 is closed, the passing pressure of the back pressure valve 4 is increased, and the high-temperature and high-pressure gas formed by the compressor 1 enters the hot fluorine pipe 6 through the compressor oil part 2. The hot fluorine solenoid valve 21 and the second ball valve 24 on the hot fluorine pipe 6 are opened, and the three-way conversion valve 15 on the first evaporator 12 is energized. The A1 port of the three-way conversion valve 15 is connected to the B1 port, and the high-temperature and high-pressure gas passes through the hot fluorine pipe 6 in sequence. The liquid passes through the B1 port and the A1 port of the three-way conversion valve 15, and finally enters the first evaporator 12 for defrosting and deicing. After completion, the high-pressure and low-temperature liquid discharged enters the liquid supply pipe 5 through the first one-way valve 17. The high-pressure and low-temperature liquid in the liquid supply pipe 5 enters the liquid reservoir 10 through the second one-way valve 18 connected in parallel with the filter 11. The liquid in the liquid reservoir 10 flows into the evaporative condenser 9 and condenses to form a gas that enters the air supply pipe 31. The air supply solenoid valve 22 and the first ball valve 23 on the air supply pipe 31 are opened, and the air supply is output to the compressor gas section 3 to supply air to the compressor 1, forming a hot fluorine defrosting and deicing cycle.

[0027] The refrigeration system is also equipped with multiple evaporators. In this embodiment, there are three groups of evaporators, namely a first evaporator 12, a second evaporator 13 and a third evaporator 14. The first evaporator 12, the second evaporator 13 and the third evaporator 14 are connected in parallel. A three-way switching valve 15 is provided on the first evaporator 12, the second evaporator 13 and the third evaporator 14 respectively. The B1 port of the three-way switching valve 15 on the first evaporator 12 is connected to the hot fluorine pipe 6 through a pipeline, and the C1 port is connected to the return air pipe 7 through a pipeline. The B2 port of the second evaporator 13 is connected to the hot fluorine pipe 6 through a pipeline, and the C2 port is connected to the return air pipe 7 through a pipeline. The third The B3 port of the evaporator 14 is connected to the hot fluorine pipe 6 through a pipeline, and the C3 port is connected to the return air pipe 7 through a pipeline. When one or two groups of evaporators are subjected to hot fluorine defrosting and deicing, the high-pressure and low-temperature liquid discharged from the evaporator after defrosting and deicing flows into the liquid supply pipe 5, and is output through the liquid supply pipe 5 to the expansion valve 16 of the evaporator being refrigerated to throttle and enter the evaporator for evaporative refrigeration, thereby improving the refrigeration efficiency of the refrigeration evaporator. The three-way conversion valve 15 on the evaporator that is working in refrigeration is not energized, and the A port of the three-way conversion valve 15 is connected to the C port. The three-way conversion valve 15 on the evaporator that is working in hot fluorine defrosting and deicing is energized, and the A port of the three-way conversion valve 15 is connected to the B port.

[0028] Example 2, combined with Figure 1 This embodiment describes a countercurrent hot fluorine defrosting and deicing method for a refrigeration system, including the following modes:

[0029] Refrigeration mode: the three-way conversion valve 15 is not energized, the A port and the C port of the first evaporator 12, the second evaporator 13 and the third evaporator 14 are connected, the defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are not energized respectively, and the high-temperature and high-pressure gas generated by the compressor 1 enters the evaporative condenser 9 through the compressor oil separator 2, and the liquid formed after condensation by the evaporative condenser 9 enters the liquid reservoir 10, and the liquid at the high-temperature ambient temperature in the liquid reservoir 10 passes through the filter 11 and enters the liquid supply pipe 5, and is finally sent to the expansion valve 16 of the first evaporator 12, the second evaporator 13 and the third evaporator 14 respectively through the branch pipe connected to the liquid supply pipe 5, and is throttled by the expansion valve 16 and sent to the first evaporator 12, the second evaporator 13 and the third evaporator 14 for evaporative cooling, and the refrigerated gas enters through the A port of the three-way conversion valve 15 of each evaporator, and is discharged from the C port to the return pipe 7, and is sent to the compressor 1 after passing through the compressor gas separator 3 through the return pipe 7, thereby forming a refrigeration cycle;

[0030] Hot fluorine defrost mode: The three-way conversion valve 15 of the first evaporator 12 is energized, and the B1 port of the energized three-way conversion valve 15 is connected to the A1 port, opening the defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22. The defrost boost solenoid valve 20 is energized and closed, thereby increasing the delivery pressure of the compressor oil separator 2 to the evaporative condenser 9. The high-temperature and high-pressure gas discharged by the compressor 1 passes through the compressor oil separator 2 and enters the hot fluorine pipe 6. It is then sent to the B1 port of the three-way conversion valve 15 on the first evaporator 12 through the hot fluorine pipe 6, enters the A1 port through the B1 port, and is then sent to the first evaporator 12 for hot fluorine defrosting;

[0031] The high-pressure and low-temperature liquid discharged from the first evaporator 12 after hot fluorine defrosting is discharged to the liquid supply pipe 5 through the first one-way valve 17 of each evaporator. The high-pressure and low-temperature liquid is divided into two paths in the liquid supply pipe 5. One path is input through the liquid supply pipe 5 to the expansion valve 16 of the second evaporator 13 and the third evaporator 14 for throttling and then sent to the second evaporator 13 and the third evaporator 14 for refrigeration. The other path flows through the liquid supply pipe 5 through the second one-way valve 18 and enters the liquid reservoir 10. The gas and liquid in the liquid reservoir 10 enter the evaporative condenser 9, and under the action of the evaporative condenser 9, the gas is formed and enters the air supply pipe 31, and is sent to the compressor gas part 3, so that the compressor gas part 3 is supplied with low-pressure air, thereby increasing the exhaust volume of the compressor 1.

[0032] The second evaporator 13 and the third evaporator 14 are operated in the same manner as the first evaporator 12 when they are defrosted by hot fluorine. The evaporator for cooling is disconnected from the power supply of the three-way switching valve 15, and the evaporator for hot fluorine defrosting and deicing is energized to the three-way switching valve 15.

[0033] Example 3, combined with Figure 2 The present embodiment is described. The refrigeration system of the present embodiment is a countercurrent hot fluorine defrosting and deicing system, comprising a compressor 1, a liquid supply pipe 5, a hot fluorine pipe 6, a return air pipe 7, a pressure relief pipe 8, an evaporative condenser 9, a liquid reservoir 10, a filter 11, a first evaporator 12, a three-way switching valve 15 and a liquid drop pipe 27. The compressor 1 is provided with a compressor oil separator 2 and a compressor gas separator 3. The compressor oil separator 2 is connected to the first evaporator 12 through the liquid supply pipe 5. The liquid supply pipe 5 is provided with a back pressure valve 4, an evaporative condenser 9, a liquid reservoir 10 and a filter 11 in sequence. The pipeline connecting the liquid supply pipe 5 and the first evaporator 12 is provided with an expansion valve. Valve 16, a first one-way valve 17 is provided on the pipeline connecting the first evaporator 12 and the downpipe 27, the other end of the downpipe 27 is connected to the liquid reservoir 10, the first evaporator 12 is connected to the hot fluorine pipe 6 and the compressor oil separator 2 through the three-way conversion valve 15, the first evaporator 12 is connected to the compressor gas separator 3 through the three-way conversion valve 15 and the return air pipe 7, the compressor gas separator 3 is connected to the back pressure valve 4 through the pressure relief pipe 8, and the pressure relief pipe 8 is provided with a defrost boost solenoid valve 20, an air supply pipe 31 is connected between the return air pipe 7 and the liquid supply pipe 5, and a third one-way valve 25 is connected between the air supply pipe 31 and the hot fluorine pipe 6.

[0034] During cooling, the three-way switching valve 15 on the first evaporator 12 is de-energized, the A1 port of the three-way switching valve 15 is connected to the C1 port, the defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are all de-energized, and the high-temperature and high-pressure gas generated by the compressor 1 passes through the compressor oil separator 2 and enters the evaporative condenser 9, the liquid reservoir 10, the filter 11 in sequence, and finally enters the expansion valve 16 of the first evaporator 12 through the liquid supply pipe 5. After throttling, it enters the first evaporator 12 for evaporative cooling. The medium discharged after cooling enters the compressor gas separator 3 through the return pipe 7 to supply air to the compressor 1;

[0035] When the first evaporator 12 is defrosted and defrosted, the three-way conversion valve 15 of the first evaporator 12 is energized, and the A1 port of the three-way conversion valve 15 is connected to the B1 port, and the defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are energized respectively, the defrost boost solenoid valve 20 is closed, the passing pressure of the back pressure valve 4 is increased, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are opened, the first ball valve 23 on the air supply pipe 31 is opened, and the second ball valve 24 on the hot fluorine pipe 6 is also opened. The high-pressure and high-temperature gas generated by the compressor 1 enters the hot fluorine pipe 6 through the compressor oil separator 2, and enters the first evaporator 12 through the B1 port and A1 port of the three-way conversion valve 15 for defrosting and defrosting. During refrigeration operation, the high-pressure, low-temperature liquid and a small amount of gas discharged from the first evaporator 12 flow through the first one-way valve 17 into the downpipe 27. The shut-off valve 26 on the downpipe 27 is opened, and the gas and liquid flow through the downpipe 27 into the liquid reservoir 10. The lower part of the liquid reservoir 10 is liquid, and the upper part is gas. The gas enters the air supply pipe 31 through the evaporative condenser 9 and is output to the compressor gas distributor 3 to replenish the compressor 1. The liquid at the bottom enters the liquid supply pipe 5 and is then throttled to the expansion valve 16 of the other refrigeration evaporators for refrigeration. The liquid in the liquid supply pipe 5 does not contain gas, so there will be no flash gas problem, thereby improving the refrigeration effect and efficiency of the evaporator that needs to be refrigerated. By energizing and closing the defrost boost solenoid valve 20, the passing pressure of the back pressure valve 4 is increased, and the high-temperature, high-pressure gas discharged from the compressor 1 directly enters the hot fluorine pipe 6 and does not enter the evaporative condenser 9, thereby improving the defrosting and deicing efficiency of the first evaporator 12.

[0036] In this embodiment, a total of four groups of evaporators are provided, namely a first evaporator 12, a second evaporator 13, a third evaporator 14 and a fourth evaporator 29. The four groups of evaporators are arranged in parallel, and each group of evaporators is respectively provided with a three-way switching valve 15, an expansion valve 16, a first one-way valve 17, a second solenoid valve 28 and a fourth one-way valve 30. The B port of the three-way switching valve 15 of each group of evaporators is connected to the hot fluorine pipe 6, and the C port is connected to the return air pipe 7. The first one-way valve 17 of each group of evaporators is connected to the downpipe 27 through a pipeline. Each group of evaporators is respectively connected to the first one-way valve 17 and the second solenoid valve 28. The expansion valve 16 and the second solenoid valve 28 are connected to the liquid supply pipe 5 through a pipeline. A fourth one-way valve 30 is provided between the expansion valve 16 and the second solenoid valve 28.

[0037] For one or more groups of evaporators that are defrosted by hot fluorine for refrigeration, the three-way switching valve 15 is energized, and the A port of the three-way switching valve 15 is connected to the B port. The high-temperature and high-pressure gas produced by the compressor 1 enters the hot fluorine pipe 6 through the compressor oil separator 2, and enters the evaporator through the connection between the B port and the A port for defrosting and de-icing. After completion, the high-pressure and low-temperature liquid discharged is mixed with a little gas and enters the liquid reservoir 10 through the first one-way valve 17 and the downpipe 27. The small amount of liquid and gas in the liquid reservoir 10 enters the evaporative condenser 9 for evaporation, and finally flows into the air supply pipe 31 to replenish the compressor 1 through the compressor gas separator 3. With the addition of the downpipe 27, it is ensured that no gas will appear in the liquid supply pipe 5, thereby improving the refrigeration effect of the evaporator that is refrigerating. The gas flows uniformly through the downpipe 27 to the liquid reservoir 10 and the evaporative condenser 9, and then enters the air supply pipe 31 for replenishment.

[0038] A pipeline is also connected between the air supply pipe 31 and the hot fluorine pipe 6, and a third one-way valve 25 is provided on the pipeline. When the flow rate of the high-temperature and high-pressure gas in the hot fluorine pipe 6 is slow, the third one-way valve 25 is opened to allow the high-pressure gas in the air supply pipe 31 to flow into the hot fluorine pipe 6, thereby accelerating the gas flow rate in the hot fluorine pipe 6 and improving the de-icing efficiency of the defrosting and de-icing evaporator.

[0039] Example 4, combined with Figure 2 This embodiment describes a countercurrent hot fluorine defrosting and deicing method for a refrigeration system, including the following modes:

[0040] Refrigeration mode: the three-way conversion valve 15 is not energized, the A port and the C port of the first evaporator 12, the second evaporator 13, the third evaporator 14 and the fourth evaporator 29 are connected, the defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are not energized respectively, the high-temperature and high-pressure gas generated by the compressor 1 enters the evaporative condenser 9 through the compressor oil separator 2, and the liquid formed after condensation by the evaporative condenser 9 enters the liquid reservoir 10, and the liquid at the high-temperature ambient temperature in the liquid reservoir 10 passes through the filter 11 and enters the liquid supply pipe 5, and is finally sent to the expansion valve 16 of the first evaporator 12, the second evaporator 13, the third evaporator 14 and the fourth evaporator 29 respectively through the branch pipe connected to the liquid supply pipe 5 for throttling, and then enters the first evaporator 12, the second evaporator 13, the third evaporator 14 and the fourth evaporator 29 after throttling for evaporative cooling;

[0041] After evaporation and cooling in each evaporator, the gas enters through port A of the three-way switching valve 15 of each evaporator, is discharged from port C into the return pipe 7, and then passes through the compressor gas separator 3 through the return pipe 7 and is sent into the compressor 1, forming a refrigeration cycle;

[0042] Hot fluorine defrost mode: the three-way conversion valve 15 of the first evaporator 12 is energized, and the A1 port and B1 port of the three-way conversion valve 15 are connected. The defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are energized. After the defrost boost solenoid valve 20 is energized, it is closed, so that the back pressure valve 4 between the compressor oil separator 2 and the evaporative condenser 9 increases in pressure. The high-temperature and high-pressure gas output by the compressor 1 enters the hot fluorine pipe 6 through the compressor oil separator 2. The high-temperature and high-pressure gas enters the B1 port of the three-way conversion valve 15 through the hot fluorine pipe 6, and then enters the A1 port and enters the first evaporator 12 to defrost the first evaporator 12;

[0043] The high-pressure and low-temperature liquid discharged from the first evaporator 12 after defrosting enters the downpipe 27 through the first one-way valve 17, and the high-pressure and low-temperature gas enters the liquid reservoir 10 through the downpipe 27. The gas in the liquid reservoir 10 enters the evaporative condenser 9 and is output to the air supply pipe 31. The gas is output to the compressor gas section 3 through the air supply pipe 31 to supply air to the compressor 1. The liquid in the liquid storage tank 10 enters the liquid supply pipe 5, and is throttled and refrigerated to the expansion valve 16 of the second evaporator 13, the third evaporator 14 and the fourth evaporator 29 through the liquid supply pipe 5, forming a hot fluorine defrost cycle.

[0044] This embodiment is only an illustrative description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes to it. As long as they do not exceed the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. Refrigeration system countercurrent hot fluorine defrosting and deicing system, characterized by: The invention comprises a compressor (1), a liquid supply pipe (5), a hot fluorine pipe (6), a return air pipe (7), a pressure relief pipe (8), an evaporative condenser (9), a liquid reservoir (10), a filter (11), a first evaporator (12) and a three-way switching valve (15). The compressor (1) is provided with a compressor oil separator (2) and a compressor gas separator (3). The compressor oil separator (2) is connected to the first evaporator (12) through the liquid supply pipe (5). The liquid supply pipe (5) is provided with a back pressure valve (4), an evaporative condenser (9), a liquid reservoir (10) and a filter (11) in sequence. The pipeline connecting the liquid supply pipe (5) and the first evaporator (12) is provided with an expansion valve (16) and a first one-way valve (15). The first evaporator (12) is connected to the hot fluorine pipe (6) and the compressor oil separator (2) through the three-way conversion valve (15). The first evaporator (12) is connected to the compressor gas separator (3) through the three-way conversion valve (15) and the return air pipe (7). A second one-way valve (18) is provided on the liquid supply pipe (5). The second one-way valve (18) is provided in parallel with the filter (11). The compressor gas separator (3) is connected to the back pressure valve (4) through the pressure relief pipe (8). The pressure relief pipe (8) is provided with a defrost boost solenoid valve (20). An air supply pipe (31) is connected between the return air pipe (7) and the liquid supply pipe (5).

2. The refrigeration system countercurrent hot fluorine defrosting and deicing system according to claim 1, characterized in that: The hot fluorine pipe (6) is provided with a hot fluorine solenoid valve (21) and a second ball valve (24), the air supply pipe (31) is provided with an air supply solenoid valve (22) and a first ball valve (23), and the liquid supply pipe (5) is provided with a first solenoid valve (19), which is connected in parallel with the second one-way valve (18).

3. The refrigeration system countercurrent hot fluorine defrosting and deicing system according to claim 1 or 2, characterized in that: The invention also includes a second evaporator (13) and a third evaporator (14). The second evaporator (13) and the third evaporator (14) are connected in parallel with the first evaporator (12). The second evaporator (13) and the third evaporator (14) are respectively connected to the liquid supply pipe (5). An expansion valve (16) and a first one-way valve (17) are respectively provided in parallel on the pipelines connecting the second evaporator (13) and the third evaporator (14) to the liquid supply pipe (5). The second evaporator (13) and the third evaporator (14) are respectively connected to the compressor oil part (2) through the three-way conversion valve (15) and the hot fluorine pipe (6). The second evaporator (13) and the third evaporator (14) are respectively connected to the compressor gas part (3) through the three-way conversion valve (15) and the return gas pipe (7).

4. Refrigeration system countercurrent hot fluorine defrosting and deicing system, characterized by: The invention comprises a compressor (1), a liquid supply pipe (5), a hot fluorine pipe (6), a return air pipe (7), a pressure relief pipe (8), an evaporative condenser (9), a liquid reservoir (10), a filter (11), a first evaporator (12), a three-way switching valve (15) and a liquid drop pipe (27). The compressor (1) is provided with a compressor oil separator (2) and a compressor gas separator (3). The compressor oil separator (2) is connected to the first evaporator (12) through the liquid supply pipe (5). The liquid supply pipe (5) is provided with a back pressure valve (4), an evaporative condenser (9), a liquid reservoir (10) and a filter (11) in sequence. An expansion valve (16) is provided on the pipeline connecting the liquid supply pipe (5) and the first evaporator (12). ) is provided on a pipeline connected to a liquid drop pipe (27), the other end of the liquid drop pipe (27) is connected to a liquid reservoir (10), the first evaporator (12) is connected to a hot fluorine pipe (6) and a compressor oil separator (2) via a three-way conversion valve (15), the first evaporator (12) is connected to a compressor gas separator (3) via a three-way conversion valve (15) and a return air pipe (7), the compressor gas separator (3) is connected to a back pressure valve (4) via a pressure relief pipe (8), a defrost boost solenoid valve (20) is provided on the pressure relief pipe (8), an air supply pipe (31) is connected between the return air pipe (7) and the liquid supply pipe (5), and a third one-way valve (25) is connected between the air supply pipe (31) and the hot fluorine pipe (6).

5. The refrigeration system countercurrent hot fluorine defrosting and deicing system according to claim 4, characterized in that: The hot fluorine pipe (6) is provided with a hot fluorine solenoid valve (21) and a second ball valve (24), the air supply pipe (31) is provided with an air supply solenoid valve (22) and a first ball valve (23), the liquid supply pipe (5) is provided with a first solenoid valve (19), and the liquid drop pipe (27) is provided with a stop valve (26).

6. The refrigeration system countercurrent hot fluorine defrosting and deicing system according to claim 5, characterized in that: A second electromagnetic valve (28) is provided on the pipeline connecting the expansion valve (16) and the liquid supply pipe (5), and a fourth one-way valve (30) is provided between the expansion valve (16) and the second electromagnetic valve (28).

7. The refrigeration system countercurrent hot fluorine defrosting and deicing system according to claim 4 or 6, characterized in that: The invention also includes a second evaporator (13), a third evaporator (14) and a fourth evaporator (29). The second evaporator (13), the third evaporator (14) and the fourth evaporator (29) are connected in parallel. The second evaporator (13), the third evaporator (14) and the fourth evaporator (29) are respectively connected to an expansion valve (16) and a first one-way valve (17). The expansion valve (16) and the first one-way valve (17) are connected in parallel. The expansion valve (16) is connected to the liquid supply pipe (5). The first one-way valve (17) is connected to the liquid downpipe (27). The second evaporator (13), the third evaporator (14) and the fourth evaporator (29) are respectively connected to the hot fluorine pipe (6) and the return air pipe (7) through the three-way conversion valve (15).

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