Countercurrent hot fluorine defrosting and deicing system and method for refrigerating system

Abstract

The invention discloses a countercurrent hot fluorine defrosting and deicing system and method for a refrigerating system, and belongs to the technical field of refrigeration house deicing and defrosting systems. 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 be generated, 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 conversion 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 and method for 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 invention belongs to the technical field of cold storage deicing and defrosting systems, and in particular relates to a countercurrent hot fluorine defrosting and deicing system and method for a refrigeration system. Background Art

[0002] The hot fluorine defrosting and deicing technology in the refrigeration system is an effective method for removing frost or ice on refrigeration equipment, and is usually used in cold storage, air conditioning and heat pump systems. When the cold storage equipment is running for a long time, the surface temperature of the evaporator drops, and the moisture condenses into frost or ice after the wet air contacts the cooling surface, which affects the refrigeration effect and increases energy consumption. The hot fluorine defrosting technology accelerates the melting of frost and ice through the heat in the refrigerant to maintain the efficient operation of the equipment.

[0003] The problem with the existing refrigeration system hot fluorine defrost and deicing system is that during the defrosting and deicing process, the compressor's air supply pressure is low, the compressor cannot be properly inflated and supplemented, 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 deiced, the liquid medium discharged from the defrosted evaporator 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.

[0004] Therefore, the present application proposes a refrigeration system countercurrent hot fluorine defrosting and deicing system and method to solve the above problems. Summary of the invention

[0005] The purpose of the research and development of the present invention 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, affecting the defrosting and deicing efficiency, and the liquid medium discharged from the defrosting evaporator 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 present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to determine the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention:

[0007] Solution 1: A countercurrent hot fluorine defrosting and deicing system for a refrigeration system, comprising a compressor, a liquid supply pipe, a hot fluorine pipe, an air return 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 provided with a back pressure valve, an evaporative condenser, a liquid reservoir and a filter in sequence. An expansion valve and a first non-return valve are provided on the pipeline connecting the liquid supply pipe and the first evaporator. The expansion valve is connected to the first non-return valve 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 a three-way switching valve and the air return pipe. A second non-return valve is provided on the liquid supply pipe. The second non-return valve is provided 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 pipe and the liquid supply pipe.

[0008] Furthermore, the hot fluorine pipe is 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 non-return valve in parallel, the second evaporator and the third evaporator are respectively connected to the compressor oil 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 through a three-way conversion valve and a return air pipe.

[0010] Solution 2: A countercurrent hot fluorine defrosting and deicing system for a refrigeration system, comprising a compressor, a liquid supply pipe, a hot fluorine pipe, an air return pipe, a pressure relief pipe, an evaporative condenser, a liquid reservoir, a filter, a first evaporator, a three-way conversion valve and a liquid drop pipe. 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 provided with a back pressure valve, an evaporative condenser, a liquid reservoir and a filter in sequence. An expansion valve is provided on the pipeline connecting the liquid supply pipe and the first evaporator. A first non-return valve is provided on the pipeline connecting the first evaporator and the liquid drop pipe. The other end of the liquid drop pipe is connected to the liquid reservoir. The first evaporator is connected to the hot fluorine pipe and the compressor oil separator through a three-way conversion valve. The first evaporator is connected to the compressor gas separator through a three-way conversion valve and the air return pipe. 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 pipe and the liquid supply pipe. A third non-return valve is connected between the air supply pipe and the hot fluorine pipe.

[0011] Furthermore, the hot fluorine pipe is 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 with 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 downflow pipe, 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] Solution 3: Refrigeration system countercurrent hot fluorine defrosting and deicing method, which is based on the refrigeration system countercurrent hot fluorine defrosting and deicing system described in Solution 1, and includes the following modes:

[0015] Refrigeration mode: The three-way conversion valve is not energized, the A port and C port of the first evaporator, the second evaporator and the third evaporator are connected, the defrost boost solenoid valve, the hot fluorine solenoid valve and the air replenishment solenoid valve are not energized respectively, the high-temperature and high-pressure gas generated by the compressor enters the evaporative condenser through the compressor oil separator, and the liquid formed after condensation by the evaporative condenser enters the liquid reservoir, and the liquid at the high-temperature ambient temperature in the liquid reservoir enters the liquid supply pipe through the filter, and is finally sent to the expansion valves of the first evaporator, the second evaporator and the third evaporator respectively through the branch pipe connected to the liquid supply pipe, and is sent to the first evaporator, the second evaporator and the third evaporator for evaporative refrigeration after throttling by the expansion valve. The refrigerated gas enters through the A port of the three-way conversion valve of each evaporator, is discharged to the return air pipe from the C port, and is sent to the compressor through the return air pipe after passing through the compressor gas separator, forming a refrigeration cycle;

[0016] Hot fluorine defrost mode: the three-way conversion valve of the first evaporator is energized, and the B1 port of the energized three-way conversion valve is connected to the A1 port, the defrost boost solenoid valve, the hot fluorine solenoid valve and the air supply solenoid valve are opened, the defrost boost solenoid valve is energized and closed, the delivery pressure of the compressor oil to the evaporative condenser is increased, and the high-temperature and high-pressure gas discharged by the compressor passes through the compressor oil and enters the hot fluorine pipe, and is sent to the B1 port of the three-way conversion valve on the first evaporator through the hot fluorine pipe, and then enters the A1 port through the B1 port and is sent to the first evaporator for hot fluorine defrosting;

[0017] The high-pressure and low-temperature liquid discharged from the first evaporator after hot fluorine defrosting is discharged to the liquid supply pipe through the first one-way valve of each evaporator. The high-pressure and low-temperature liquid is divided into two paths in the liquid supply pipe. One path is input into the expansion valve of the second evaporator and the third evaporator through the liquid supply pipe for throttling and then sent to the second evaporator and the third evaporator for refrigeration. The other path flows through the second one-way valve through the liquid supply pipe and enters the liquid reservoir. The gas and liquid in the liquid reservoir enter the evaporative condenser, and under the action of the evaporative condenser, the gas is formed and enters the air supply pipe, and is sent to the compressor gas part, so that the compressor gas part obtains low-pressure air supply, thereby increasing the exhaust volume of the compressor.

[0018] Solution 4: Refrigeration system countercurrent hot fluorine defrosting and deicing method, which is based on the refrigeration system countercurrent hot fluorine defrosting and deicing system described in Solution 2, and includes the following modes:

[0019] Refrigeration mode: The three-way conversion valve is not energized, the A ports and C ports of the first, second, third and fourth evaporators are connected, the defrost boost solenoid valve, hot fluorine solenoid valve and air replenishment solenoid valve are not energized, and the high-temperature and high-pressure gas generated by the compressor enters the evaporative condenser through the compressor oil separator, and the liquid formed after condensation by the evaporative condenser enters the liquid reservoir. The liquid at the high-temperature ambient temperature in the liquid reservoir enters the liquid supply pipe through the filter, and is finally sent to the expansion valves of the first, second, third and fourth evaporators through the branch pipes connected to the liquid supply pipe for throttling, and then enters the first, second, third and fourth evaporators for evaporative cooling after throttling;

[0020] After evaporation and refrigeration in each evaporator, the gas enters through the A port of the three-way conversion valve of each evaporator, is discharged into the return air pipe through the C port, and is sent into the compressor through the return air pipe after passing through the compressor gas distribution, forming a refrigeration cycle;

[0021] Hot fluorine defrost mode: the three-way conversion valve of the first evaporator is energized, the A1 port of the three-way solenoid valve is connected to the B1 port, the defrost boost solenoid valve, the hot fluorine solenoid valve and the air supply solenoid valve are energized, and the defrost boost solenoid valve is closed after being energized, so that the back pressure valve between the compressor oil separator and the evaporative condenser increases the pressure, and the high-temperature and high-pressure gas output by the compressor enters the hot fluorine pipe through the compressor oil separator. The high-temperature and high-pressure gas enters the B1 port of the three-way conversion valve through the hot fluorine pipe, passes into the A1 port, and then enters the first evaporator to defrost the first evaporator;

[0022] The high-pressure and low-temperature liquid discharged from the first evaporator after defrosting enters the downpipe through the first one-way valve, and the high-pressure and low-temperature gas enters the liquid reservoir through the downpipe. The gas in the liquid reservoir enters the evaporative condenser and is output to the air supply pipe. The gas is output to the compressor gas part through the air supply pipe to replenish the compressor. The liquid in the liquid storage tank enters the liquid supply pipe, and is throttled and refrigerated to the expansion valves of the second evaporator, the third evaporator and the fourth evaporator through the liquid supply pipe, forming a hot fluorine defrost cycle.

[0023] The present invention has the following beneficial effects:

[0024] 1. In the countercurrent hot fluorine defrosting and deicing system of the refrigeration system of the present invention, under the action of the back pressure valve, during the process of defrosting and deicing 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 defrosted 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 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. The compressor will not have liquid accumulation and will not be damaged.

[0025] 2. The refrigeration system countercurrent hot fluorine defrosting and deicing system of the present invention is also provided with a liquid drop pipe. Under the action of the liquid drop pipe, the high-pressure and low-temperature liquid discharged from the evaporator being defrosted and deiced is discharged into the liquid reservoir through the liquid drop pipe. The liquid in the liquid reservoir enters the evaporator being refrigerated through the liquid supply pipe for refrigeration. The gas in the liquid reservoir enters the air supply pipe through the evaporative condenser and then enters the compressor gas part to realize the air supply of 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, and there will be no flash gas problem, thereby improving the refrigeration efficiency of the evaporator being refrigerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the countercurrent hot fluorine defrosting and deicing system of the refrigeration system;

[0027] Figure 2 It is a schematic diagram of a countercurrent hot fluorine defrosting and deicing system of a refrigeration system equipped with a downpipe;

[0028] Figure 3 yes Figure 2 A partial schematic diagram of .

[0029] In the figure, 1- compressor, 2- compressor oil, 3- compressor gas, 4- back pressure valve, 5- liquid supply pipe, 6- hot fluorine pipe, 7- air return pipe, 8- pressure relief pipe, 9- evaporative condenser, 10- liquid storage tank, 11- filter, 12- first evaporator, 13- second evaporator, 14- third evaporator, 15- three-way switching valve, 16- expansion valve, 17- first check valve, 18- second check 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 check valve, 26- stop valve, 27- liquid drop pipe, 28- second solenoid valve, 29- fourth evaporator, 30- fourth check valve, 31- air supply pipe. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0031] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is 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 defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Embodiment 1, combination Figure 1The present embodiment is described. The refrigeration system countercurrent hot fluorine defrosting and deicing system of the present embodiment 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 switching valve 15. 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 part 2 through the three-way conversion valve 15, the first evaporator 12 is connected to the compressor gas part 3 through the three-way conversion valve 15 and the return air pipe 7, the liquid supply pipe 5 is provided with a second one-way valve 18, the second one-way valve 18 is arranged in parallel with the filter 11, the compressor gas part 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 cold air blower or iron pipe or copper pipe.

[0034] 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 storage 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 refrigeration. The medium discharged after evaporative refrigeration enters the compressor gas separator 3 through the return air pipe 7 to replenish the compressor 1.

[0035] During hot fluorine defrosting and defrosting, the defrost boost solenoid valve 20 arranged on the pressure relief pipe 8 connecting the back pressure valve 4 and the compressor gas part 3 is energized. When it is not energized, the defrost boost solenoid valve 20 is in a normally open state. After being energized, 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, so as to supply air to the compressor 1, forming a hot fluorine defrosting and deicing cycle.

[0036] The refrigeration system is also equipped with multiple evaporators. In this embodiment, a total of three groups of evaporators are provided, 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. The first evaporator 12, the second evaporator 13 and the third evaporator 14 are respectively provided with a three-way conversion valve 15. The B1 port of the three-way conversion 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 defrosted and de-iced by hot fluorine, the high-pressure and low-temperature liquid discharged from the evaporator after defrosting and de-icing 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 switching valve 15 on the evaporator being refrigerated is not energized, and the A port of the three-way switching valve 15 is connected to the C port. The three-way switching valve 15 on the evaporator being defrosted and de-iced is energized, and the A port of the three-way switching valve 15 is connected to the B port.

[0037] Embodiment 2, combined Figure 1 The present embodiment is described. The countercurrent hot fluorine defrosting and deicing method for a refrigeration system of the present embodiment includes the following modes:

[0038] 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 replenishment 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 enters the liquid supply pipe 5 through the filter 11, and finally is 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 sent to the first evaporator 12, the second evaporator 13 and the third evaporator 14 after throttling by the expansion valve 16 for evaporative refrigeration, 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, forming a refrigeration cycle;

[0039] Hot fluorine defrosting 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, the defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are opened, the defrost boost solenoid valve 20 is energized and closed, and the delivery pressure of the compressor oil 2 to the evaporative condenser 9 is increased, and the high-temperature and high-pressure gas discharged by the compressor 1 passes through the compressor oil 2 and enters the hot fluorine pipe 6, and is sent to the B1 port of the three-way conversion valve 15 on the first evaporator 12 through the hot fluorine pipe 6, and then enters the A1 port through the B1 port and is sent to the first evaporator 12 for hot fluorine defrosting;

[0040] 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 non-return 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 non-return 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 portion 3, so that the compressor gas portion 3 is supplied with low-pressure air, thereby increasing the exhaust volume of the compressor 1.

[0041] The operation method of the second evaporator 13 and the third evaporator 14 for hot fluorine defrosting is the same as that of the first evaporator 12. The evaporator for cooling is disconnected from the power of the three-way switching valve 15, and the evaporator for hot fluorine defrosting and defrosting is energized to the three-way switching valve 15.

[0042] Embodiment 3, combined Figure 2 The present embodiment is described. The refrigeration system countercurrent hot fluorine defrosting and deicing system of the present embodiment 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. The pipeline connecting the liquid supply pipe 5 and the first evaporator 12 is provided with an expansion Valve 16, a first one-way valve 17 is arranged 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 part 2 through the three-way conversion valve 15, the first evaporator 12 is connected to the compressor gas part 3 through the three-way conversion valve 15 and the return air pipe 7, the compressor gas part 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, and a third one-way valve 25 is connected between the air supply pipe 31 and the hot fluorine pipe 6.

[0043] During refrigeration, the three-way conversion valve 15 on the first evaporator 12 is not energized, the A1 port of the three-way conversion 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 not energized, and the high-temperature and high-pressure gas generated by the compressor 1 enters the evaporative condenser 9, the liquid storage 10, the filter 11 in sequence through the compressor oil separator 2, 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 refrigeration. The medium discharged after refrigeration enters the compressor gas separator 3 through the return air pipe 7 to supply air to the compressor 1;

[0044] When the first evaporator 12 is defrosted and defrosted, the three-way conversion valve 15 of the first evaporator 12 is energized, the A1 port of the three-way conversion valve 15 is connected to the B1 port, 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, and 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 the A1 port of the three-way conversion valve 15 for defrosting and defrosting. During the ice operation, the high-pressure and low-temperature liquid and a small amount of gas discharged from the first evaporator 12 flow into the liquid downpipe 27 through the first one-way valve 17. The stop valve 26 on the liquid downpipe 27 is opened, and the gas and liquid flow into the liquid reservoir 10 through the liquid downpipe 27. 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 division 3 to replenish the compressor 1. The liquid in the lower part enters the liquid supply pipe 5, and then throttles and refrigerates the expansion valve 16 of other refrigeration evaporators. The liquid in the liquid supply pipe 5 does not contain gas, and there will be no flash gas problem, thereby improving the refrigeration effect and efficiency of the evaporator that needs to be refrigerated. After the defrost boost solenoid valve 20 is powered on and closed, the passing pressure of the back pressure valve 4 is increased, and the high-temperature and high-pressure gas discharged from the compressor 1 directly enters the hot fluorine pipe 6, and will not enter the evaporative condenser 9, thereby improving the defrosting and deicing efficiency of the first evaporator 12.

[0045] 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 conversion valve 15, an expansion valve 16, a first non-return valve 17, a second solenoid valve 28 and a fourth non-return valve 30. The B port of the three-way conversion 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 non-return valve 17 of each group of evaporators is connected to the liquid downpipe 27 through a pipeline. Each group of evaporators is respectively connected to the first non-return 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, and a fourth non-return valve 30 is provided between the expansion valve 16 and the second solenoid valve 28.

[0046] For one or more groups of evaporators that are defrosted by hot fluorine for refrigeration, the three-way conversion valve 15 is energized, and the A port of the three-way conversion 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 deicing. After completion, the discharged high-pressure and low-temperature liquid mixed with a little gas 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 action of adding the downpipe 27, it is ensured that no gas appears in the liquid supply pipe 5, thereby improving the refrigeration effect on the evaporator that is in refrigeration operation. The gas flows to the liquid reservoir 10 and the evaporative condenser 9 through the downpipe 27 and then enters the air supply pipe 31 for replenishing.

[0047] 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 arranged 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 deicing efficiency of the defrosting and deicing evaporator.

[0048] Embodiment 4, combined Figure 2 The present embodiment is described. The refrigeration system countercurrent hot fluorine defrosting and deicing method of the present embodiment includes the following modes:

[0049] 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 replenishment solenoid valve 22 are not energized, 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 enters the liquid supply pipe 5 through the filter 11, and finally is sent to the expansion valve 16 of the first evaporator 12, the second evaporator 13, the third evaporator 14 and the fourth evaporator 29 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 for evaporative cooling after throttling;

[0050] After evaporation and refrigeration in each evaporator, the gas enters through the A port of the three-way conversion valve 15 of each evaporator, is discharged from the C port to the return air pipe 7, and is sent to the compressor 1 through the return air pipe 7 and the compressor gas 3, thus forming a refrigeration cycle;

[0051] Hot fluorine defrosting mode: the three-way conversion valve 15 of the first evaporator 12 is energized, the A1 port of the three-way conversion valve 15 is connected to the B1 port, the defrost boost solenoid valve 20, the hot fluorine solenoid valve 21 and the air supply solenoid valve 22 are energized, and the defrost boost solenoid valve 20 is closed after being energized, so that the back pressure valve 4 between the compressor oil separator 2 and the evaporative condenser 9 increases the pressure, and the compressor 1 outputs high-temperature and high-pressure gas through the compressor oil separator 2 and enters the hot fluorine pipe 6. The high-temperature and high-pressure gas enters the B1 port of the three-way conversion valve 15 through the hot fluorine pipe 6, passes through the A1 port, and then enters the first evaporator 12 to achieve defrosting of the first evaporator 12;

[0052] 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 part 3 through the air supply pipe 31 to replenish 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.

[0053] This embodiment is only an exemplary description of the present invention and does not limit its protection scope. Those skilled in the art may also make partial changes thereto. As long as they do not exceed the spirit of the present invention, they are 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 pipe (7), a pressure relief pipe (8), an evaporative condenser (9), a liquid storage tank (10), a filter (11), a first evaporator (12) and a three-way conversion 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 storage tank (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 conversion valve (15). 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 part (2) through the three-way conversion valve (15); the first evaporator (12) is connected to the compressor gas part (3) through the three-way conversion valve (15) and the return pipe (7); a second one-way valve (18) is arranged on the liquid supply pipe (5); the second one-way valve (18) is arranged in parallel with the filter (11); the compressor gas part (3) is connected to the back pressure valve (4) through the pressure relief pipe (8); a defrost boost solenoid valve (20) is arranged on the pressure relief pipe (8); and an air supply pipe (31) is connected between the return 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 comprises 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 non-return valve (17) are respectively arranged 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 pipe (7), a pressure relief pipe (8), an evaporative condenser (9), a liquid storage tank (10), a filter (11), a first evaporator (12), a three-way conversion 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 storage tank (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). The first evaporator (12) is provided with a three-way conversion valve (15). ) is provided with a first non-return valve (17) on a pipeline connecting the first evaporator (12) and the liquid downpipe (27); the other end of the liquid 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 part (2) via a three-way conversion valve (15); the first evaporator (12) is connected to the compressor gas part (3) via a three-way conversion valve (15) and the return air pipe (7); the compressor gas part (3) is connected to the 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 non-return 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 comprises 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 with an expansion valve (16) and a first non-return valve (17). The expansion valve (16) and the first non-return valve (17) are connected in parallel. The expansion valve (16) is connected with a liquid supply pipe (5). The first non-return valve (17) is connected with a liquid drop pipe (27). The second evaporator (13), the third evaporator (14) and the fourth evaporator (29) are respectively connected with a hot fluorine pipe (6) and a gas return pipe (7) via a three-way conversion valve (15).

8. A method for defrosting and deicing a refrigeration system by using countercurrent hot fluorine. The method is implemented by using the countercurrent hot fluorine defrosting and deicing system for a refrigeration system as claimed in claim 3, and is characterized in that: The following modes are included: 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, the high-temperature and high-pressure gas generated by the compressor (1) enters the evaporative condenser (9) through the compressor oil separator (2), 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) enters the liquid supply pipe (5) through the filter (11). ), and finally sent to the expansion valves (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 sent to the first evaporator (12), the second evaporator (13) and the third evaporator (14) for evaporative cooling after throttling by the expansion valve (16). 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). After passing through the compressor gas part (3) through the return pipe (7), it is sent to the compressor (1), thereby forming a refrigeration cycle; Hot fluorine defrosting mode: the three-way conversion valve (15) of the first evaporator (12) is energized, the B1 port of the energized three-way conversion valve (15) is connected to the A1 port, the defrost boost solenoid valve (20), the hot fluorine solenoid valve (21) and the air supply solenoid valve (22) are opened, the defrost boost solenoid valve (20) is energized and closed, the delivery pressure of the compressor oil (2) to the evaporative condenser (9) is increased, the high-temperature and high-pressure gas discharged by the compressor (1) passes through the compressor oil (2) and enters the hot fluorine pipe (6), is 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; 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 non-return 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 non-return valve (18) and enters the liquid storage device (10). The gas and liquid in the liquid storage device (10) enter the evaporative condenser (9). 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 portion (3), so that the compressor gas portion (3) is supplemented with low-pressure gas, thereby increasing the exhaust volume of the compressor (1).

9. A method for defrosting and deicing a refrigeration system by using a countercurrent hot fluorine defrosting and deicing system, the method being realized by using the countercurrent hot fluorine defrosting and deicing system for a refrigeration system as claimed in claim 7, characterized in that: The following modes are included: 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, 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 storage tank ( 10), the liquid at the high temperature ambient temperature in the liquid storage tank (10) enters the liquid supply pipe (5) through the filter (11), and is finally sent to the expansion valves (16) of the first evaporator (12), the second evaporator (13), the third evaporator (14) and the fourth evaporator (29) 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) for evaporative cooling; After evaporation and refrigeration in each evaporator, the gas enters through the A port of the three-way conversion valve (15) of each evaporator, is discharged from the C port into the return pipe (7), passes through the compressor gas part (3) through the return pipe (7), and is sent into the compressor (1), thus forming a refrigeration cycle; Hot fluorine defrosting mode: the three-way conversion valve (15) of the first evaporator (12) is energized, the A1 port of the three-way conversion valve (15) is connected to the B1 port, the defrost boost solenoid valve (20), the hot fluorine solenoid valve (21) and the air supply solenoid valve (22) are energized, and the defrost boost solenoid valve (20) is closed after being energized, so that the back pressure valve (4) between the compressor oil separator (2) and the evaporative condenser (9) increases the pressure, and the high-temperature and high-pressure gas output by the compressor (1) enters the hot fluorine pipe (6) through the compressor oil separator (2), and 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), thereby achieving defrosting of the first evaporator (12); The high-pressure and low-temperature liquid discharged from the first evaporator (12) after defrosting enters the liquid downpipe (27) through the first non-return valve (17), and the high-pressure and low-temperature gas enters the liquid reservoir (10) through the liquid 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 part (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), thereby forming a hot fluorine defrosting cycle.

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