Countercurrent efficient hot fluorine defrosting and deicing system and defrosting and deicing method

Abstract

The invention discloses a countercurrent efficient hot fluorine defrosting and deicing system and a defrosting and deicing method, and belongs to the technical field of refrigeration house deicing and defrosting systems. The problems that according to an existing hot fluorine defrosting and deicing technology, the air supply pressure is low, the compressor cannot be inflated and supplemented, the liquid accumulation phenomenon is likely to occur, the defrosting efficiency is low, and the compressor is likely to be damaged are solved. A compressor oil component of a compressor is sequentially connected with a condenser, a liquid storage tank, a filter and a first fan through a liquid supply pipe, a compressor gas component of the compressor is connected with a compressor gas suction pipe, and the first fan is connected with a compressor exhaust pipe and the compressor gas suction pipe through a three-way conversion valve. The liquid supply pipe, the compressor exhaust pipe and the compressor air suction pipe are connected through the high-pressure change-over valve. According to the countercurrent efficient hot fluorine defrosting and deicing system and method, the defrosting effect is good, air supply of the compressor is sufficient, the problem of liquid accumulation cannot be generated, and the compressor cannot be damaged.

Description

Technical Field

[0001] The invention belongs to the technical field of cold storage defrosting systems, and in particular relates to a countercurrent high-efficiency hot fluorine defrosting and defrosting system and a defrosting and defrosting method. Background Art

[0002] In the cold storage, when air passes through the evaporator, the temperature of the evaporator surface is lower than the dew point temperature of the air, and the water vapor in the air will condense into water droplets, and further freeze to form frost. Frost and ice that are not dealt with for a long time will reduce the refrigeration efficiency, increase energy consumption and electricity consumption, and the compressor unit will be easily damaged, affecting the quality of the goods in the cold storage.

[0003] At present, hot fluorine defrosting is adopted to reflux the refrigerant. When defrosting is needed, the system makes the refrigerant flow from the condenser back to the evaporator through the control system, and changes the flow direction at the same time, usually in the reverse direction. When the refrigerant flows through the evaporator, the Freon in the evaporator absorbs heat, melts the frost and the heat of the surrounding air, and begins to evaporate. This process raises the temperature of the evaporator, thereby removing the frost layer. However, the existing hot fluorine defrosting technology has a low suction pressure of the compressor, and the compressor cannot get sufficient air supply, resulting in low defrosting efficiency, increased energy consumption, and easy to produce liquid accumulation, causing major accidents that damage the compressor.

[0004] In addition, the evaporator of the existing unit is in a low-pressure state during cooling, and the condenser end is in a high-pressure state. When the defrosting and defrosting mode is turned on, the evaporator quickly increases in pressure and expands, resulting in expansion and contraction. In severe cases, the problem of pipe bursting may easily occur.

[0005] Therefore, the present application proposes a countercurrent high-efficiency thermal fluorine defrosting and deicing system and a defrosting and deicing method to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that the existing hot fluorine defrosting and deicing technology has low suction pressure, the compressor cannot get sufficient air supply, resulting in low defrosting efficiency, increased energy consumption, easy to produce liquid accumulation, and cause major accidents such as damage to the compressor. 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 identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0007] The technical solution of the present invention:

[0008] Solution 1: Countercurrent high-efficiency hot fluorine defrosting and deicing system, including a compressor, a high-pressure conversion valve, a condenser, a liquid storage tank, a filter, a three-way conversion valve and a first fan. The compressor oil of the compressor is connected to the condenser, the liquid storage tank, the filter and the first fan in sequence through a liquid supply pipe, the compressor gas of the compressor is connected to the compressor suction pipe, the first fan is connected to the compressor exhaust pipe and the compressor suction pipe respectively through a three-way conversion valve, and the liquid supply pipe, the compressor exhaust pipe and the compressor suction pipe are connected through a high-pressure conversion valve.

[0009] Furthermore, a stop valve is provided on the pipeline connecting the filter and the liquid storage tank, and a solenoid valve is provided on the pipeline connecting the filter and the first fan.

[0010] Furthermore, a parallel pipeline is provided on the liquid supply pipe, a second one-way valve is provided on the parallel pipeline, and the second one-way valve is connected in parallel with the filter and the solenoid valve.

[0011] Furthermore, an expansion valve and a first one-way valve are provided on the pipeline connecting the first blower and the liquid supply pipe, and the expansion valve and the first one-way valve are connected in parallel.

[0012] Furthermore, a first ball valve is provided on the pipeline connecting the compressor oil and the condenser, a second ball valve is provided on the compressor exhaust pipe, and a third ball valve is provided on the compressor intake pipe.

[0013] Furthermore, it also includes a second fan and a third fan, and the first fan, the second fan and the third fan are connected in parallel.

[0014] Solution 2: Countercurrent high-efficiency hot compress defrosting and deicing method, based on the countercurrent high-efficiency hot compress defrosting and deicing system described in Solution 1, includes the following modes:

[0015] Refrigeration mode: The high-pressure conversion valve and the three-way conversion valve must not be energized, the A tube of the high-pressure conversion valve is connected to the B tube, the C tube and the D tube are disconnected, the A1 tube of the three-way conversion valve is connected to the B1 tube, the high-temperature and high-pressure gas discharged by the compressor enters the condenser through the compressor oil separator and the high-pressure conversion valve, the high-temperature and high-pressure gas enters the condenser and condenses into a liquid at a high-pressure ambient temperature and enters the liquid storage tank, the stop valve is opened and enters the filter, and is sent to the expansion valve of the first fan through the liquid supply pipe, and is throttled by the expansion valve and sent to the first fan for refrigeration;

[0016] After the first fan refrigerates and evaporates, it enters the compressor suction pipe through the A1 pipe and B1 pipe of the three-way conversion valve, enters the compressor gas part through the compressor suction pipe, and flows into the compressor to form a refrigeration cycle;

[0017] Defrost and deicing mode: the high-pressure conversion valve and the three-way conversion valve are energized, the A pipe of the high-pressure conversion valve is connected to the C pipe, the B pipe is connected to the D pipe, the A1 pipe of the three-way conversion valve is connected to the C1 pipe, and the high-temperature and high-pressure gas discharged from the compressor enters the compressor exhaust pipe through the A pipe and C pipe of the high-pressure conversion valve, and then enters the C1 pipe and A1 pipe of the three-way conversion valve through the compressor exhaust pipe, and flows into the first fan for defrosting and deicing;

[0018] The high-temperature and high-pressure gas in the first fan is defrosted and de-iced, and then the high-pressure and low-temperature liquid is discharged. The first one-way valve in parallel with the expansion valve is opened, and the liquid flows out through the pipeline of the first one-way valve to the liquid supply pipe. The high-pressure and low-temperature liquid in the liquid supply pipe enters the liquid storage tank through the second one-way valve, and is buffered in the liquid storage tank to form gas and liquid. The gas and liquid enter the condenser, and the liquid evaporates in the condenser. The gas is replenished into the compressor gas part through the B tube and D tube of the high-pressure conversion valve. The compressor gas part replenishes the gas into the compressor, and the compressor is replenished with air. The compressor exhaust volume increases, and the circulation flow rate is increased.

[0019] Solution 3: Countercurrent high-efficiency hot compress defrosting and deicing method, based on the countercurrent high-efficiency hot compress defrosting and deicing system described in Solution 1, includes the following modes:

[0020] Refrigeration mode: The high-pressure conversion valve and the three-way conversion valve must not be energized, the A tube of the high-pressure conversion valve is connected to the B tube, the C tube and the D tube are disconnected, the A1 tube of the three-way conversion valve is connected to the B1 tube, the compressor discharges high-temperature and high-pressure gas into the condenser through the compressor oil separator and the high-pressure conversion valve, the high-temperature and high-pressure gas enters the condenser and condenses into a liquid at a high-pressure ambient temperature and enters the liquid storage tank, the stop valve is opened to enter the filter, and is respectively sent to the expansion valves of the first fan, the second fan and the third fan through the liquid supply pipe, and the expansion valve throttles and sends it to the first fan, the second fan and the third fan for refrigeration;

[0021] After the first, second and third fans have cooled and evaporated, the air enters the compressor suction pipe through the A1 and B1 pipes of the three-way conversion valve, enters the compressor gas part through the compressor suction pipe, and flows into the compressor to form a refrigeration cycle;

[0022] Defrost and de-icing mode:

[0023] De-icing and defrosting of the first fan: the high-pressure conversion valve and the three-way conversion valve of the first fan are energized, the three-way conversion valves of the second and third fans are not energized, the A pipe of the high-pressure conversion valve is connected to the C pipe, the B pipe is connected to the D pipe, the A1 pipe of the three-way conversion valve of the first fan is connected to the C1 pipe, the high-temperature and high-pressure gas discharged from the compressor enters the compressor exhaust pipe through the A pipe and C pipe of the high-pressure conversion valve, and the high-temperature and high-pressure gas enters the C1 pipe and A1 pipe of the three-way conversion valve of the first fan through the compressor exhaust pipe, and flows into the first fan for defrosting and de-icing;

[0024] After the high-temperature and high-pressure gas in the first fan is defrosted and de-iced, the high-pressure and low-temperature liquid is discharged, the first one-way valve connected in parallel with the expansion valve is opened, and the first one-way valves of the second and third fans are closed, and the liquid flows out through the pipeline of the first one-way valve to the liquid supply pipe, and the high-pressure and low-temperature liquid in the liquid supply pipe flows into the expansion valve throttling of the second and third fans and is sent to the second and third fans for refrigeration. After the second and third fans are refrigerated, they enter the compressor suction pipe through the A1 pipe and the B1 pipe of the three-way conversion valve, and enter the compressor gas part through the compressor suction pipe. The remaining high-pressure and low-temperature liquid enters the liquid storage tank through the second one-way valve, and is buffered in the liquid storage tank to form gas and liquid. The gas and liquid enter the condenser, and the liquid evaporates in the condenser. The gas is replenished into the compressor gas part through the B pipe and the D pipe of the high-pressure conversion valve. The compressor gas part replenishes the gas into the compressor, replenishes the compressor, and the compressor exhaust volume is increased, the circulation flow rate is increased, and the defrosting and deicing work of the first fan is completed;

[0025] The second fan defrosts and defrosts: After the first fan completes defrosting and defrosting, close the first one-way valve on the first fan, the three-way conversion valve of the first fan is de-energized, the three-way conversion valve of the second fan is energized, open the first one-way valve of the second fan, and the high-temperature and high-pressure gas discharged from the compressor enters the compressor exhaust pipe through the A pipe and C pipe of the high-pressure conversion valve. The high-temperature and high-pressure gas enters the C1 pipe and A1 pipe of the three-way conversion valve of the second fan through the compressor exhaust pipe, and flows into the second fan for defrosting and defrosting;

[0026] After the high-temperature and high-pressure gas in the second fan is defrosted and de-iced, the high-pressure and low-temperature liquid is discharged and flows out through the pipeline of the first one-way valve to the liquid supply pipe. The high-pressure and low-temperature liquid in the liquid supply pipe flows into the expansion valve throttling of the first fan and the third fan and is sent to the first fan and the third fan for refrigeration. After the first fan and the third fan are refrigerated, they enter the compressor suction pipe through the A1 pipe and the B1 pipe of the three-way conversion valve, and enter the compressor gas part through the compressor suction pipe. The remaining high-pressure and low-temperature liquid enters the liquid storage tank through the second one-way valve, and is buffered in the liquid storage tank to form gas and liquid. The gas and liquid enter the condenser, and the liquid evaporates in the condenser. The gas is replenished into the compressor gas part through the B pipe and the D pipe of the high-pressure conversion valve. The compressor gas part replenishes the gas into the compressor to replenish the compressor. The compressor exhaust volume increases, the circulation flow rate is increased, and the defrosting and deicing work of the second fan is completed;

[0027] The third fan defrosts and defrosts: After the second fan completes defrosting and defrosting, close the first one-way valve on the second fan, the three-way conversion valve of the second fan is de-energized, the three-way conversion valve of the third fan is energized, open the first one-way valve of the third fan, and the high-temperature and high-pressure gas discharged from the compressor enters the compressor exhaust pipe through the A pipe and C pipe of the high-pressure conversion valve. The high-temperature and high-pressure gas enters the C1 pipe and A1 pipe of the three-way conversion valve of the third fan through the compressor exhaust pipe, and flows into the third fan for defrosting and defrosting;

[0028] After the high-temperature and high-pressure gas in the third fan is defrosted and de-iced, the high-pressure and low-temperature liquid is discharged and flows out through the pipeline of the first one-way valve to the liquid supply pipe. The high-pressure and low-temperature liquid in the liquid supply pipe flows into the expansion valve throttling of the first and second fans and is sent to the first and second fans for refrigeration. After refrigeration by the first and second fans, the liquid enters the compressor suction pipe through the A1 pipe and the B1 pipe of the three-way conversion valve, and enters the compressor gas part through the compressor suction pipe. The remaining high-pressure and low-temperature liquid enters the liquid storage tank through the second one-way valve, and is buffered in the liquid storage tank to form gas and liquid. The gas and liquid enter the condenser, and the liquid evaporates in the condenser. The gas is replenished into the compressor gas part through the B pipe and the D pipe of the high-pressure conversion valve. The compressor gas part replenishes the gas into the compressor, replenishes the compressor, increases the compressor exhaust volume, increases the circulation flow rate, and completes the defrosting and deicing work of the third fan.

[0029] The present invention has the following beneficial effects:

[0030] 1. The countercurrent high-efficiency hot fluorine defrosting and deicing system of the present invention uses a countercurrent hot fluorine defrosting method to defrost the fan surface after frost forms on the fan surface during fan refrigeration through the coordinated use of a high-pressure conversion valve and a three-way conversion valve. The compressor can be fully supplied with air, the medium circulation flow in the pipeline is large, the defrosting effect on the fan surface is good, the defrosting efficiency is high, the compressor is fully supplied with air, and there will be no problem of liquid accumulation and no damage to the compressor.

[0031] 2. The countercurrent high-efficiency hot fluorine defrosting and deicing system of the present invention, under the action of the high-pressure conversion valve and the three-way conversion valve, when each fan or aluminum bar and other evaporators are converted from refrigeration mode to defrosting and deicing mode, the fan and the aluminum bar do not instantly change from low pressure to high pressure, but gradually change from low pressure to high pressure, and the fan or aluminum bar and other evaporators will not have the serious problem of pipe burst. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a single-fan countercurrent high-efficiency hot fluorine defrosting and deicing system;

[0033] Figure 2 It is a schematic diagram of a multi-fan counter-current high-efficiency hot fluorine defrosting and deicing system;

[0034] Figure 3 It is a schematic diagram of a countercurrent high-efficiency hot fluorine defrost and deicing system using aluminum bars.

[0035] In the figure: 1- compressor, 2- compressor gas separator, 3- compressor oil separator, 4- high pressure conversion valve, 5- condenser, 6- liquid storage tank, 7- filter, 8- liquid supply pipe, 9- compressor exhaust pipe, 10- compressor suction pipe, 11- three-way conversion valve, 12- expansion valve, 13- first one-way valve, 14- solenoid valve, 15- stop valve, 16- first ball valve, 17- second ball valve, 18- third ball valve, 19- second one-way valve, 20- first fan, 21- second fan, 22- third fan, 23- aluminum row. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Embodiment 1, combination Figure 1 , Figure 3The present embodiment is described. The countercurrent high-efficiency hot fluorine defrosting and deicing system of the present embodiment comprises a compressor 1, a high-pressure conversion valve 4, a condenser 5, a liquid storage tank 6, a filter 7, a three-way conversion valve 11 and a first fan 20. The compressor oil portion 3 of the compressor 1 is connected to the condenser 5, the liquid storage tank 6, the filter 7 and the first fan 20 in sequence through a liquid supply pipe 8, the compressor gas portion 2 of the compressor 1 is connected to a compressor suction pipe 10, the first fan 20 is respectively connected to a compressor exhaust pipe 9 and a compressor suction pipe 10 through a three-way conversion valve 11, and the liquid supply pipe 8, the compressor exhaust pipe 9 and the compressor suction pipe 10 are connected through a high-pressure conversion valve 4.

[0040] The present embodiment is a defrosting and deicing system of a single fan. During refrigeration, the high-pressure conversion valve 4 and the three-way conversion valve 11 are not energized, the A tube and the B tube of the high-pressure conversion valve 4 are connected, the A1 tube and the B1 tube of the three-way conversion valve 11 are connected, and the first ball valve 16 installed on the pipeline between the compressor oil separator 3 and the condenser 5, the stop valve 15 on the pipeline connecting the liquid storage tank 6 and the filter 7, and the solenoid valve 14 on the pipeline connecting the filter 7 and the first fan 20 are opened respectively. The high-temperature and high-pressure gas discharged from the compressor 1 enters the condenser 5 through the compressor oil separator 3 and the A tube and the B tube of the high-pressure conversion valve 4 for condensation, and the condensed liquid at the high-pressure ambient temperature enters the liquid storage tank 6. The liquid at the high-pressure ambient temperature enters the expansion valve 20 through the filter 7, and enters the first fan 20 for refrigeration after throttling by the expansion valve 20. After entering the first fan 20 for refrigeration and evaporation, it enters the compressor suction pipe 10 through the A1 tube and the B1 tube of the three-way conversion valve 11, enters the compressor gas separator 2 through the compressor suction pipe 10, and finally flows into the compressor 1 to form a refrigeration cycle;

[0041] When it is necessary to remove frost and ice on the first fan 20, the high-pressure conversion valve 4 and the three-way conversion valve 11 are energized, the A tube and the B tube of the high-pressure conversion valve 4 are disconnected, the A tube is connected to the C tube, the B tube is connected to the D tube, the C1 tube of the three-way conversion valve 11 is connected to the A1 tube, the third ball valve 18 on the compressor exhaust pipe 9 and the second ball valve 17 on the compressor suction pipe 10 are opened, and the high-temperature and high-pressure gas discharged from the compressor 1 enters the compressor exhaust pipe 9 through the A tube and the C tube of the high-pressure conversion valve 4, enters the C1 tube and the A1 tube of the three-way conversion valve 11 through the compressor exhaust pipe 9, and finally flows into the first fan 20 for defrosting and deicing. After defrosting and deicing, the first fan 20 discharges high-pressure and low-temperature liquid, and the expansion valve 1 is opened. 2, and a second one-way valve 19 on the liquid supply pipe 8 connected in parallel with the filter 7 and the solenoid valve 14, the high-pressure and low-temperature liquid flows out to the liquid supply pipe 8 through the pipeline of the first one-way valve 13, enters the liquid storage tank 6 through the second one-way valve 19, and forms a large amount of gas and a small amount of liquid in the liquid storage tank 6. The large amount of gas and the small amount of gas enter the condenser 5, and the condenser 5 evaporates the liquid into gas and then discharges it, and replenishes it into the compressor gas part 2 through the B pipe and the D pipe of the high-pressure conversion valve 4. The compressor gas part 2 replenishes a large amount of gas into the compressor 1, forming a large amount of gas replenishment for the compressor 1, and the exhaust volume of the compressor 1 increases. When the hot fluorine defrosting and deicing work, the circulation flow rate in each pipeline is increased, and the deicing efficiency in the first fan 20 is accelerated;

[0042] Moreover, when the first fan 20 is defrosting and defrosting, under the action of the high-pressure switching valve 4 and the three-way switching valve 11, the pressure at the first fan 20 gradually increases, and does not become high pressure instantly. Therefore, there is no risk of pipe bursting during the repeated switching of long-term refrigeration and defrosting.

[0043] According to actual needs, the first fan 20 can also be replaced by an aluminum row 23, as shown in the attached Figure 3 As shown, except for the aluminum row 23, all existing evaporators are applicable, such as iron pipes, copper pipes, etc.

[0044] Embodiment 2, combined Figure 2 The present embodiment is described. The countercurrent high-efficiency hot fluorine defrosting and deicing system of the present embodiment adopts a multi-fan refrigeration and deicing and defrosting mode. In the present embodiment, three sets of fans are used, including a first fan 20, a second fan 21 and a third fan 22. The first fan 20, the second fan 21 and the third fan 22 are connected in parallel. Each fan is connected to a compressor suction pipe 10 and a compressor exhaust pipe 9 through a three-way conversion valve 11, and the other pipeline is connected to a liquid supply pipe 10;

[0045] When the three fans are cooling at the same time, the high-pressure conversion valve 4 and the three-way conversion valve 11 are both de-energized, the A tube and the B tube of the high-pressure conversion valve 4 are connected, the A1 tube and the B1 tube of the three-way conversion valve 11 are connected, the stop valve 15, the solenoid valve 14, the first ball valve 16 and the expansion valve 12 are opened, and the high-temperature and high-pressure gas discharged from the compressor 1 enters the condenser 5 through the compressor oil separator 3 and the high-pressure conversion valve 4. The high-temperature and high-pressure gas enters the condenser 5 and condenses into a liquid at the high-pressure ambient temperature, which enters the liquid storage tank 6 and the filter 7 in turn, and is respectively sent to the expansion valves 12 of the first fan 20, the second fan 21 and the third fan 22 through the liquid supply pipe 8. The expansion valve 12 throttles and sends it to the first fan 20, the second fan 21 and the third fan 22 for cooling; after the first fan 20, the second fan 21 and the third fan 22 are cooled and evaporated, they enter the compressor suction pipe 10 through the A1 tube and the B1 tube of the three-way conversion valve 11, enter the compressor gas separator 2 through the compressor suction pipe 10, and flow into the compressor 1 to form a refrigeration cycle.

[0046] When a single fan is defrosted and defrosted, taking the first fan 20 as an example, when the first fan 20 is defrosted and defrosted, the second ball valve 17 and the third ball valve 18 are opened, the first check valve 13 on the first fan 20 and the second check valve 19 on the liquid supply pipe 8 are opened, the high-pressure conversion valve 4 and the three-way conversion valve 11 of the first fan 20 are energized, so that the A pipe of the high-pressure conversion valve 4 is connected to the C pipe, the B pipe is connected to the D pipe, and the A1 of the three-way conversion valve 11 of the first fan 20 is connected. The pipe is connected with the C1 pipe, the three-way conversion valve 11 of the second fan 21 and the third fan 22 is not energized, the first check valve 13 on the second fan 21 and the third fan 22 is closed, and the high-temperature and high-pressure gas discharged from the compressor 1 enters the compressor exhaust pipe 9 through the A pipe and the C pipe of the high-pressure conversion valve 4, and the high-temperature and high-pressure gas enters the C1 pipe and the A1 pipe of the three-way conversion valve 11 of the first fan 20 through the compressor exhaust pipe 9, and flows into the first fan 20 for defrosting and deicing;

[0047] After the high-temperature and high-pressure gas in the first fan 20 is defrosted and de-iced, the high-pressure and low-temperature liquid is discharged and flows out through the pipeline of the first one-way valve 13 of the first fan 20 to the liquid supply pipe 8. Most of the high-pressure and low-temperature liquid in the liquid supply pipe 8 flows into the expansion valve 12 of the second fan 21 and the third fan 22 for throttling and is sent to the second fan 21 and the third fan 22 for refrigeration. After the second fan 21 and the third fan 22 are refrigerated, they enter the compressor suction pipe 10 through the A1 pipe and the B1 pipe of the three-way conversion valve 11, and then enter the compressor suction pipe 10. Enter the compressor gas division 2, and the remaining small part of the high-pressure and low-temperature liquid enters the liquid storage tank 6 through the second one-way valve 19, and buffers and evaporates in the liquid storage tank 6 to form evaporated gas and evaporated liquid. The evaporated gas and evaporated liquid enter the condenser 5, and the liquid evaporates in the condenser 5. A large amount of gas is replenished into the compressor gas division 2 through the B tube and the D tube of the high-pressure conversion valve 4. The compressor gas division 2 replenishes the gas into the compressor 1 to replenish the compressor 1, and the exhaust volume of the compressor 1 increases, thereby increasing the circulation flow rate, and completing the deicing and defrosting work of the first fan 20;

[0048] When the second fan 21 is defrosting, the three-way conversion valve 11 of the second fan 21 is energized, the three-way conversion valve 11 of the first fan 20 is disconnected, the first one-way valve 13 on the first fan 20 is closed, and the first one-way valve 13 on the second fan 21 is opened. In the above manner, the high-pressure and high-temperature gas discharged from the compressor 1 enters the second fan 21 for defrosting and deicing, and the discharged high-pressure and low-temperature liquid enters the first fan 20 and the third fan 22, and is throttled by the expansion valve 12 of the first fan 20 and the third fan 22 for refrigeration. The remaining high-pressure and low-temperature liquid enters the liquid storage tank 6 through the second one-way valve 19, and is buffered in the liquid storage tank 6 to form evaporated gas and evaporated liquid. The evaporated gas and The evaporated liquid enters the condenser 5, and the evaporated liquid evaporates in the condenser 5. A large amount of gas is replenished into the compressor gas division 2 through the B tube and the D tube of the high-pressure conversion valve 4. The compressor gas division 2 replenishes the gas into the compressor 1 to replenish the compressor 1. The exhaust volume of the compressor 1 increases, and the circulation flow rate is increased to complete the defrosting and defrosting work of the second fan 21; the defrosting mode of the third fan 22 is the same as the operation mode of the first fan 20 and the second fan 21. Under the action of the high-pressure conversion valve 4 and the three-way conversion valve 11 of each fan, while each single fan is defrosting, the remaining fans continue to perform refrigeration work. The medium flow rate in the pipeline is fast, the compressor is fully replenished with gas, and the defrosting and refrigeration efficiency is high.

[0049] Embodiment 3, combined Figure 1 This embodiment is described. The single-fan countercurrent high-efficiency hot compress defrosting and deicing method of this embodiment includes the following modes:

[0050] Refrigeration mode: The high-pressure conversion valve 4 and the three-way conversion valve 11 are not energized, the A tube of the high-pressure conversion valve 4 is connected to the B tube, the C tube and the D tube are disconnected, the A1 tube of the three-way conversion valve 11 is connected to the B1 tube, the compressor 1 discharges high-temperature and high-pressure gas into the condenser 5 through the compressor oil separator 3 and the high-pressure conversion valve 4, the high-temperature and high-pressure gas enters the condenser 5 and condenses into a liquid at a high-pressure ambient temperature and enters the liquid storage tank 6, the stop valve 15 is opened and enters the filter 7, and is sent to the expansion valve 12 of the first fan 20 through the liquid supply pipe 8, and is throttled by the expansion valve 12 and sent to the first fan 20 for refrigeration;

[0051] After the first fan 20 cools and evaporates, the air enters the compressor suction pipe 10 through the A1 pipe and the B1 pipe of the three-way conversion valve 11, enters the compressor gas part 2 through the compressor suction pipe 10, and flows into the compressor 1 to form a refrigeration cycle;

[0052] Defrost and deicing mode: the high-pressure conversion valve 4 and the three-way conversion valve 11 are energized, the A tube of the high-pressure conversion valve 4 is connected to the C tube, the B tube is connected to the D tube, the A1 tube of the three-way conversion valve 11 is connected to the C1 tube, and the high-temperature and high-pressure gas discharged from the compressor 1 enters the compressor exhaust pipe 9 through the A tube and the C tube of the high-pressure conversion valve 4, and the high-temperature and high-pressure gas enters the C1 tube and the A1 tube of the three-way conversion valve 11 through the compressor exhaust pipe 9, and flows into the first fan 20 for defrosting and deicing;

[0053] The high-temperature and high-pressure gas in the first fan 20 is defrosted and de-iced, and then the high-pressure and low-temperature liquid is discharged. The first one-way valve 13 connected in parallel with the expansion valve 12 is opened, and the high-pressure and low-temperature liquid flows out through the pipeline of the first one-way valve 13 to the liquid supply pipe 8. The high-pressure and low-temperature liquid in the liquid supply pipe 8 enters the liquid storage tank 6 through the second one-way valve 19, and buffers and evaporates in the liquid storage tank 6 to form evaporated gas and evaporated liquid. The evaporated gas and evaporated liquid enter the condenser 5, and the evaporated liquid evaporates in the condenser 5. A large amount of gas is replenished into the compressor gas division 2 through the B tube and the D tube of the high-pressure conversion valve 4. The compressor gas division 2 replenishes the gas into the compressor 1, and the compressor 1 is replenished with air. The exhaust volume of the compressor 1 is increased, and the circulation flow rate is increased.

[0054] Embodiment 4, combined Figure 2 This embodiment is described. The multi-fan countercurrent high-efficiency hot compress defrosting and deicing method of this embodiment includes the following modes:

[0055] Refrigeration mode: The high-pressure conversion valve 4 and the three-way conversion valve 11 are not energized, the A tube of the high-pressure conversion valve 4 is connected to the B tube, the C tube and the D tube are disconnected, the A1 tube of the three-way conversion valve 11 is connected to the B1 tube, the compressor 1 discharges high-temperature and high-pressure gas into the condenser 5 through the compressor oil separator 3 and the high-pressure conversion valve 4, the high-temperature and high-pressure gas enters the condenser 5 and condenses into a liquid at a high-pressure ambient temperature and enters the liquid storage tank 6, the stop valve 15 is opened and enters the filter 7, and is respectively sent to the expansion valves 12 of the first fan 20, the second fan 21 and the third fan 22 through the liquid supply pipe 8, and the expansion valve 12 throttles and sends it to the first fan 20, the second fan 21 and the third fan 22 for refrigeration;

[0056] After the first fan 20, the second fan 21 and the third fan 22 cool and evaporate, the air enters the compressor suction pipe 10 through the A1 pipe and the B1 pipe of the three-way conversion valve 11, enters the compressor gas part 2 through the compressor suction pipe 10, and flows into the compressor 1 to form a refrigeration cycle;

[0057] Defrost and de-icing mode:

[0058] The first fan 20 defrosts and defrosts: the high-pressure conversion valve 4 and the three-way conversion valve 11 of the first fan 20 are energized, the three-way conversion valves 11 of the second fan 21 and the third fan 22 are not energized, the A tube of the high-pressure conversion valve 4 is connected to the C tube, the B tube is connected to the D tube, the A1 tube of the three-way conversion valve 11 of the first fan 20 is connected to the C1 tube, the high-temperature and high-pressure gas discharged from the compressor 1 enters the compressor exhaust pipe 9 through the A tube and the C tube of the high-pressure conversion valve 4, and the high-temperature and high-pressure gas enters the C1 tube and the A1 tube of the three-way conversion valve 11 of the first fan 20 through the compressor exhaust pipe 9, and flows into the first fan 20 for defrosting and defrosting;

[0059] After the high-temperature and high-pressure gas in the first fan 20 is defrosted and de-iced, the high-pressure and low-temperature liquid is discharged, the first one-way valve 13 connected in parallel with the expansion valve 12 is opened, and the first one-way valves 13 of the second and third fans 21 and 22 are closed, and the high-pressure and low-temperature liquid flows out through the pipeline of the first one-way valve 13 to the liquid supply pipe 8, and the high-pressure and low-temperature liquid in the liquid supply pipe 8 flows into the expansion valve 12 of the second and third fans 21 and 22 for throttling and is sent to the second and third fans 21 and 22 for refrigeration. After the second and third fans 21 and 22 are refrigerated, they enter the compression chamber through the A1 pipe and the B1 pipe of the three-way conversion valve 11 The air enters the compressor gas division 2 through the compressor suction pipe 10, and the remaining high-pressure and low-temperature liquid enters the liquid storage tank 6 through the second one-way valve 19, and buffers and evaporates in the liquid storage tank 6 to form evaporated gas and evaporated liquid. The evaporated gas and evaporated liquid enter the condenser 5, and the evaporated liquid evaporates in the condenser 5. A large amount of gas is replenished into the compressor gas division 2 through the B tube and the D tube of the high-pressure conversion valve 4. The compressor gas division 2 replenishes the gas into the compressor 1, and the compressor 1 is replenished with gas. The exhaust volume of the compressor 1 increases, the circulation flow rate is increased, and the deicing and defrosting work of the first fan 20 is completed;

[0060] The second fan 21 defrosts and defrosts: After the first fan 20 completes defrosting and defrosting, the first one-way valve 13 on the first fan 20 is closed, the three-way conversion valve 11 of the first fan 20 is not energized, the three-way conversion valve 11 of the second fan 21 is energized, the first one-way valve 13 of the second fan 21 is opened, and the high-temperature and high-pressure gas discharged from the compressor 1 enters the compressor exhaust pipe 9 through the A pipe and the C pipe of the high-pressure conversion valve 4, and the high-temperature and high-pressure gas enters the C1 pipe and the A1 pipe of the three-way conversion valve 11 of the second fan 21 through the compressor exhaust pipe 9, and flows into the second fan 21 to perform defrosting and defrosting;

[0061] The high-temperature and high-pressure gas in the second fan 21 is defrosted and de-iced, and then the high-pressure and low-temperature liquid is discharged, and flows out through the pipeline of the first one-way valve 13 to the liquid supply pipe 8. The high-pressure and low-temperature liquid in the liquid supply pipe 8 flows into the expansion valve 12 of the first fan 20 and the third fan 22 for throttling and is sent to the first fan 20 and the third fan 22 for refrigeration. After the first fan 20 and the third fan 22 are refrigerated, they enter the compressor suction pipe 10 through the A1 pipe and the B1 pipe of the three-way conversion valve 11, and enter the compressor through the compressor suction pipe 10. The remaining high-pressure and low-temperature liquid enters the liquid storage tank 6 through the second one-way valve 19, and is buffered and evaporated in the liquid storage tank 6 to form evaporated gas and evaporated liquid. The evaporated gas and evaporated liquid enter the condenser 5, and the evaporated liquid evaporates in the condenser 5. A large amount of gas is replenished into the compressor gas division 2 through the B tube and the D tube of the high-pressure conversion valve 4. The compressor gas division 2 replenishes the gas into the compressor 1 to replenish the compressor 1. The exhaust volume of the compressor 1 increases, the circulation flow rate is increased, and the deicing and defrosting work of the second fan 21 is completed;

[0062] The third fan 22 defrosts and defrosts: After the second fan 21 completes defrosting and defrosting, the first one-way valve 13 on the second fan 21 is closed, the three-way conversion valve 11 of the second fan 21 is de-energized, the three-way conversion valve 11 of the third fan 22 is energized, the first one-way valve 13 of the third fan 22 is opened, and the high-temperature and high-pressure gas discharged from the compressor enters the compressor exhaust pipe 9 through the A pipe and the C pipe of the high-pressure conversion valve 4, and the high-temperature and high-pressure gas enters the C1 pipe and the A1 pipe of the three-way conversion valve 11 of the third fan 22 through the compressor exhaust pipe 9, and flows into the third fan 22 for defrosting and defrosting;

[0063] The high-temperature and high-pressure gas in the third fan 22 is defrosted and de-iced, and then the high-pressure and low-temperature liquid is discharged, and flows out through the pipeline of the first one-way valve 13 to the liquid supply pipe 8. The high-pressure and low-temperature liquid in the liquid supply pipe 8 flows into the expansion valve 12 of the first fan 20 and the second fan 21 for throttling and is sent to the first fan 20 and the second fan 21 for refrigeration. After the first fan 20 and the second fan 21 are refrigerated, they enter the compressor suction pipe 10 through the A1 pipe and the B1 pipe of the three-way conversion valve 11, and enter the compressor through the compressor suction pipe 10. The remaining high-pressure and low-temperature liquid enters the liquid storage tank 6 through the second one-way valve 19, and is buffered and evaporated in the liquid storage tank 6 to form evaporated gas and evaporated liquid. The evaporated gas and evaporated liquid enter the condenser 5, and the evaporated liquid evaporates in the condenser 5. A large amount of gas is replenished into the compressor gas division 2 through the B tube and D tube of the high-pressure conversion valve 4. The compressor gas division 2 replenishes the gas into the compressor 1, and the compressor 1 is replenished with gas. The exhaust volume of the compressor 1 is increased, and the circulation flow rate is increased to complete the deicing and defrosting work of the third fan 22.

[0064] 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. Countercurrent high-efficiency hot fluorine defrosting and deicing system, characterized by: The invention comprises a compressor (1), a high-pressure conversion valve (4), a condenser (5), a liquid storage tank (6), a filter (7), a three-way conversion valve (11) and a first fan (20); the compressor oil part (3) of the compressor (1) is connected to the condenser (5), the liquid storage tank (6), the filter (7) and the first fan (20) in sequence through a liquid supply pipe (8); the compressor gas part (2) of the compressor (1) is connected to a compressor suction pipe (10); the first fan (20) is connected to a compressor exhaust pipe (9) and a compressor suction pipe (10) respectively through a three-way conversion valve (11); the liquid supply pipe (8), the compressor exhaust pipe (9) and the compressor suction pipe (10) are connected through the high-pressure conversion valve (4).

2. The countercurrent high-efficiency hot compress defrosting and deicing system according to claim 1 is characterized in that: A stop valve (15) is provided on the pipeline connecting the filter (7) and the liquid storage tank (6), and a solenoid valve (14) is provided on the pipeline connecting the filter (7) and the first fan (20).

3. The countercurrent high-efficiency hot compress defrosting and deicing system according to claim 2 is characterized in that: The liquid supply pipe (8) is provided with a parallel pipeline, and a second one-way valve (19) is provided on the parallel pipeline. The second one-way valve (19) is connected in parallel with the filter (7) and the solenoid valve (14).

4. The countercurrent high-efficiency hot compress defrosting and deicing system according to claim 3 is characterized in that: An expansion valve (12) and a first one-way valve (13) are provided on the pipeline connecting the first fan (20) and the liquid supply pipe (8), and the expansion valve (12) and the first one-way valve (13) are connected in parallel.

5. The countercurrent high-efficiency hot compress defrosting and deicing system according to claim 4 is characterized in that: A first ball valve (16) is provided on the pipeline connecting the compressor oil separator (3) and the condenser (5), a second ball valve (17) is provided on the compressor exhaust pipe (9), and a third ball valve (18) is provided on the compressor intake pipe (10).

6. The countercurrent high-efficiency hot compress defrosting and deicing system according to claim 1 or 5, characterized in that: It also includes a second fan (21) and a third fan (22), and the first fan (20), the second fan (21) and the third fan (22) are connected in parallel.

7. A countercurrent high-efficiency hot compress defrosting and deicing method, implemented by the countercurrent high-efficiency hot compress defrosting and deicing system according to claim 5, characterized in that: The following modes are included: Refrigeration mode: the high-pressure conversion valve (4) and the three-way conversion valve (11) are not electrically connected, the A tube and the B tube of the high-pressure conversion valve (4) are connected, the C tube and the D tube are disconnected, the A1 tube and the B1 tube of the three-way conversion valve (11) are connected, the high-temperature and high-pressure gas discharged by the compressor (1) enters the condenser (5) through the compressor oil separator (3) and the high-pressure conversion valve (4), the high-temperature and high-pressure gas enters the condenser (5) and condenses into a liquid at a high-pressure ambient temperature and enters the liquid storage tank (6), the stop valve (15) is opened to enter the filter (7), and is sent to the expansion valve (12) of the first fan (20) through the liquid supply pipe (8), and is throttled by the expansion valve (12) and sent to the first fan (20) for refrigeration; After the first fan (20) cools and evaporates, the air enters the compressor suction pipe (10) through the A1 pipe and the B1 pipe of the three-way conversion valve (11), enters the compressor gas part (2) through the compressor suction pipe (10), and flows into the compressor (1) to form a refrigeration cycle; Defrost and deicing mode: the high-pressure conversion valve (4) and the three-way conversion valve (11) are energized, the A tube of the high-pressure conversion valve (4) is connected to the C tube, the B tube is connected to the D tube, the A1 tube of the three-way conversion valve (11) is connected to the C1 tube, the high-temperature and high-pressure gas discharged from the compressor (1) enters the compressor exhaust pipe (9) through the A tube and the C tube of the high-pressure conversion valve (4), and the high-temperature and high-pressure gas enters the C1 tube and the A1 tube of the three-way conversion valve (11) through the compressor exhaust pipe (9), and flows into the first fan (20) to perform defrosting and deicing operations; After the high-temperature and high-pressure gas in the first fan (20) performs defrosting and deicing operations, the high-pressure and low-temperature liquid is discharged, and the first one-way valve (13) connected in parallel with the expansion valve (12) is opened. The high-pressure and low-temperature liquid flows out through the pipeline of the first one-way valve (13) to the liquid supply pipe (8). The high-pressure and low-temperature liquid in the liquid supply pipe (8) enters the liquid storage tank (6) through the second one-way valve (19), and is buffered in the liquid storage tank (6) to form gas and liquid. The gas and liquid enter the condenser (5), and the liquid evaporates in the condenser (5). The gas is replenished into the compressor gas part (2) through the B pipe and the D pipe of the high-pressure conversion valve (4). The compressor gas part (2) replenishes the gas into the compressor (1), and the compressor (1) is replenished with gas. The exhaust volume of the compressor (1) is increased, and the circulation flow rate is increased.

8. A countercurrent high-efficiency hot compress defrosting and deicing method, implemented by the countercurrent high-efficiency hot compress defrosting and deicing system according to claim 6, characterized in that: The following modes are included: Refrigeration mode: the high-pressure conversion valve (4) and the three-way conversion valve (11) are not electrically connected, the A tube and the B tube of the high-pressure conversion valve (4) are connected, the C tube and the D tube are disconnected, the A1 tube and the B1 tube of the three-way conversion valve (11) are connected, the high-temperature and high-pressure gas discharged by the compressor (1) enters the condenser (5) through the compressor oil separator (3) and the high-pressure conversion valve (4), the high-temperature and high-pressure gas enters the condenser (5) and condenses into a liquid at a high-pressure ambient temperature and enters the liquid storage tank (6), the stop valve (15) is opened to enter the filter (7), and is respectively sent to the expansion valves (12) of the first fan (20), the second fan (21) and the third fan (22) through the liquid supply pipe (8), and the expansion valve (12) throttles and sends the liquid to the first fan (20), the second fan (21) and the third fan (22) for refrigeration; After the first fan (20), the second fan (21) and the third fan (22) cool and evaporate, the gas enters the compressor suction pipe (10) through the A1 pipe and the B1 pipe of the three-way conversion valve (11), enters the compressor gas part (2) through the compressor suction pipe (10), and flows into the compressor (1) to form a refrigeration cycle; Defrost and de-icing mode: The first fan (20) defrosts and defrosts: the high-pressure conversion valve (4) and the three-way conversion valve (11) of the first fan (20) are energized, the three-way conversion valves (11) of the second fan (21) and the third fan (22) are de-energized, the A pipe of the high-pressure conversion valve (4) is connected to the C pipe, the B pipe is connected to the D pipe, the A1 pipe of the three-way conversion valve (11) of the first fan (20) is connected to the C1 pipe, the high-temperature and high-pressure gas discharged from the compressor (1) enters the compressor exhaust pipe (9) through the A pipe and the C pipe of the high-pressure conversion valve (4), and the high-temperature and high-pressure gas enters the C1 pipe and the A1 pipe of the three-way conversion valve (11) of the first fan (20) through the compressor exhaust pipe (9), and flows into the first fan (20) to perform defrosting and defrosting operations; After the high-temperature and high-pressure gas in the first fan (20) is defrosted and de-iced, the high-pressure and low-temperature liquid is discharged, the first one-way valve (13) connected in parallel with the expansion valve (12) is opened, the first one-way valve (13) of the second fan (21) and the third fan (22) is closed, and the high-pressure and low-temperature liquid flows out through the pipeline of the first one-way valve (13) to the liquid supply pipe (8), the high-pressure and low-temperature liquid in the liquid supply pipe (8) flows into the expansion valve (12) of the second fan (21) and the third fan (22), is throttled, and is sent to the second fan (21) and the third fan (22) for refrigeration. After the second fan (21) and the third fan (22) are refrigerated, the liquid is discharged through the A1 of the three-way conversion valve (11). The B pipe and the B1 pipe enter the compressor suction pipe (10), and enter the compressor gas part (2) through the compressor suction pipe (10). The remaining high-pressure and low-temperature liquid enters the liquid storage tank (6) through the second one-way valve (19), and is buffered in the liquid storage tank (6) to form gas and liquid. The gas and liquid enter the condenser (5), and the liquid evaporates in the condenser (5). The gas is replenished into the compressor gas part (2) through the B pipe and the D pipe of the high-pressure conversion valve (4). The compressor gas part (2) replenishes the gas into the compressor (1), and the compressor (1) is replenished with gas. The exhaust volume of the compressor (1) is increased, the circulation flow rate is increased, and the deicing and defrosting work of the first fan (20) is completed. The second fan (21) defrosts and defrosts: after the first fan (20) completes defrosting and defrosting, the first one-way valve (13) on the first fan (20) is closed, the three-way conversion valve (11) of the first fan (20) is powered off, the three-way conversion valve (11) of the second fan (21) is powered on, the first one-way valve (13) of the second fan (21) is opened, and the high-temperature and high-pressure gas discharged from the compressor (1) enters the compressor exhaust pipe (9) through the A pipe and the C pipe of the high-pressure conversion valve (4), and the high-temperature and high-pressure gas enters the C1 pipe and the A1 pipe of the three-way conversion valve (11) of the second fan (21) through the compressor exhaust pipe (9), and flows into the second fan (21) to perform defrosting and defrosting; After the high-temperature and high-pressure gas in the second fan (21) performs defrosting and deicing, the high-pressure and low-temperature liquid is discharged and flows out through the pipeline of the first one-way valve (13) to the liquid supply pipe (8). The high-pressure and low-temperature liquid in the liquid supply pipe (8) flows into the expansion valve (12) of the first fan (20) and the third fan (22) to be throttled and sent to the first fan (20) and the third fan (22) for refrigeration. After the first fan (20) and the third fan (22) have been refrigerated, they enter the compressor suction pipe (10) through the A1 pipe and the B1 pipe of the three-way conversion valve (11) and pass through the compressor suction pipe. (10) enters the compressor gas section (2), and the remaining high-pressure and low-temperature liquid enters the liquid storage tank (6) through the second one-way valve (19), and is buffered in the liquid storage tank (6) to form gas and liquid. The gas and liquid enter the condenser (5), and the liquid evaporates in the condenser (5). The gas is replenished into the compressor gas section (2) through the B pipe and the D pipe of the high-pressure conversion valve (4). The compressor gas section (2) replenishes the gas into the compressor (1), and the compressor (1) is replenished with gas. The exhaust volume of the compressor (1) is increased, and the circulation flow rate is increased, so that the second fan (21) completes the deicing and defrosting work; The third fan (22) defrosts and defrosts: after the second fan (21) completes defrosting and defrosting, the first one-way valve (13) on the second fan (21) is closed, the three-way conversion valve (11) of the second fan (21) is powered off, the three-way conversion valve (11) of the third fan (22) is powered on, the first one-way valve (13) of the third fan (22) is opened, and the high-temperature and high-pressure gas discharged from the compressor enters the compressor exhaust pipe (9) through the A pipe and the C pipe of the high-pressure conversion valve (4), and the high-temperature and high-pressure gas enters the C1 pipe and the A1 pipe of the three-way conversion valve (11) of the third fan (22) through the compressor exhaust pipe (9), and flows into the third fan (22) to perform defrosting and defrosting; After the high-temperature and high-pressure gas in the third fan (22) performs defrosting and deicing, the high-pressure and low-temperature liquid is discharged and flows out through the pipeline of the first one-way valve (13) to the liquid supply pipe (8). The high-pressure and low-temperature liquid in the liquid supply pipe (8) flows into the expansion valve (12) of the first fan (20) and the second fan (21) to be throttled and sent to the first fan (20) and the second fan (21) for refrigeration. After the first fan (20) and the second fan (21) are refrigerated, they enter the compressor suction pipe (10) through the A1 pipe and the B1 pipe of the three-way conversion valve (11) and pass through the compressor suction pipe. (10) enters the compressor gas section (2), and the remaining high-pressure and low-temperature liquid enters the liquid storage tank (6) through the second one-way valve (19), and is buffered in the liquid storage tank (6) to form gas and liquid. The gas and liquid enter the condenser (5), and the liquid evaporates in the condenser (5). The gas is replenished into the compressor gas section (2) through the B pipe and the D pipe of the high-pressure conversion valve (4). The compressor gas section (2) replenishes the gas into the compressor (1), and the compressor (1) is replenished with gas. The exhaust volume of the compressor (1) is increased, the circulation flow rate is increased, and the deicing and defrosting work of the third fan (22) is completed.

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