Air cooler defrosting and pressure relief system based on hot fluorine pressure

Abstract

The utility model provides an air cooler defrosting and pressure relief system based on hot fluorine pressure, which is characterized in that a liquid supply pipeline (3) is connected with a liquid supply inlet of an air cooler (5) through a liquid supply valve assembly (4), and an air return pipeline (2) is connected to an air return port of the air cooler (5) through a third stop valve (21), a second electromagnetic valve (23) and a fourth stop valve (24); the hot fluorine pipeline (1) is connected to a hot fluorine defrosting inlet of the air cooler (5) through a first stop valve (11), a first filter (12), a first electromagnetic valve (13) and a second stop valve (14), and a hot fluorine defrosting outlet is connected to an air return pipeline (2) of an air return port of the air cooler (5) through a second one-way valve (6). The system can accurately judge the melting and falling degree of frost on the surface of the air cooler, the phenomenon of incomplete defrosting or excessive defrosting caused by fixed hot fluorine defrosting time is avoided, and the system is simple in structure, convenient to operate and easy to control.

Description

Technical Field

[0001] The utility model relates to the technical field of defrosting of cold air machines, and in particular to a defrosting and pressure relief system for cold air machines based on hot fluorine pressure. Background Art

[0002] Frost on the surface of the cooling fan in the cold storage seriously affects the cold conduction and distribution of the cooling fan, and hinders the cooling effect of the refrigeration system. According to data, when the thickness of the ice layer on the surface of the cooling fan reaches a certain level, the cooling efficiency of the refrigeration system will drop by 30%, resulting in a huge waste of energy and even greatly shortening the service life of the entire refrigeration system. Therefore, the defrosting operation of the refrigeration system is a routine operation that must be performed during the operation of the refrigeration system.

[0003] At present, hot fluorine defrost technology is one of the important technical means to solve the problem of frost on the surface of the cold air blower in the cold storage. Hot fluorine defrost uses the high-temperature and high-pressure gaseous refrigerant discharged from the refrigeration compressor to transport the high-temperature and high-pressure gaseous refrigerant to the cold air blower through the hot fluorine defrost pipeline, and heats the frost on the surface of the cold air blower to achieve the purpose of defrosting. However, when performing hot fluorine defrost, a timed defrost method is usually adopted, that is, the duration of hot fluorine defrost is fixed. If the thickness of the frost layer on the surface of the cold air blower in the cold storage is relatively thin, it is very easy to cause overheating of the cold air blower, resulting in a waste of resources; if the thickness of the frost layer on the surface of the cold air blower in the cold storage is relatively thick, due to the fixed duration of hot fluorine defrost, it is easy to cause the frost layer on the surface of the cold air blower to not completely fall off and end the hot fluorine defrost process, which directly affects the refrigeration efficiency of the cold air blower.

[0004] In view of this, how to accurately control the duration of hot fluorine defrost to achieve the purpose of complete defrosting of the air cooler is a technical problem that urgently needs to be solved in the current hot fluorine defrost technology. Summary of the invention

[0005] In view of the above-mentioned technical defects, the utility model adopts a cold air machine defrost system based on hot fluorine pressure to accurately control the time of hot fluorine defrost, so as to achieve the purpose of cold air machine defrost and pressure relief, and proposes a cold air machine defrost and pressure relief system based on hot fluorine pressure.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: a defrost and pressure relief system for an air cooler based on hot fluorine pressure, comprising a hot fluorine pipeline, an air return pipeline, a liquid supply pipeline and an air cooler, wherein the liquid supply pipeline is connected to the liquid supply inlet of the air cooler through a liquid supply valve assembly, the air return pipeline is connected to the air return port of the air cooler through a third stop valve, a second solenoid valve and a fourth stop valve, the hot fluorine pipeline is connected to the hot fluorine defrost inlet of the air cooler through a first stop valve, a first filter, a first solenoid valve and a second stop valve, and the hot fluorine defrost outlet is connected to the return pipeline of the air cooler return port through a second one-way valve.

[0007] Furthermore, the liquid supply valve assembly includes a fifth stop valve, a second filter, a third solenoid valve, a first one-way valve, a straight-through throttle valve and a sixth stop valve. Along the flow direction of the refrigerant in the liquid supply pipeline, the fifth stop valve, the second filter, the third solenoid valve, the first one-way valve, the straight-through throttle valve and the sixth stop valve are installed on the liquid supply pipeline in sequence.

[0008] Furthermore, the inlet pipe and outlet pipe of the second solenoid valve are respectively connected to the inlet and outlet of the pneumatic valve through pipes, the pneumatic valve and the second solenoid valve are installed in parallel on the return air pipe, and the pressure difference controller of the pneumatic valve is connected to the hot fluorine defrost pipe between the first filter and the first solenoid valve through a pipe.

[0009] Furthermore, a leakage pipe is installed between the liquid supply pipe and the return air pipe, the overflow valve is installed on the leakage pipe, one end of the leakage pipe is connected to the liquid supply pipe of the cold air blower liquid supply inlet, and the other end of the leakage pipe is installed on the return air pipe between the third stop valve and the second solenoid valve.

[0010] By adopting the above technical scheme, compared with the prior art, the utility model is a defrosting and pressure relief system for an air cooler based on hot fluorine pressure. By monitoring the opening degree of the pneumatic valve, it can accurately judge the degree of melting and falling of frost on the outer surface of the air cooler, thereby avoiding incomplete defrosting or excessive defrosting caused by fixed hot fluorine defrosting time. In addition, the system has a simple structure, is easy to operate and easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the overall system principle diagram of the utility model;

[0012] Figure 2 This is a schematic diagram of the liquid supply valve assembly of the utility model.

[0013] Marked in the figure: 1: hot fluorine pipeline; 11: first stop valve; 12: first filter; 13: first solenoid valve; 14: second stop valve; 2: return air pipeline; 21: third stop valve; 22: pneumatic valve; 23: second solenoid valve; 24: fourth stop valve; 3: liquid supply pipeline; 4: liquid supply valve assembly; 41: fifth stop valve; 42: second filter; 43: third solenoid valve; 44: first one-way valve; 45: straight-through throttle valve; 46: sixth stop valve; 5: air cooler; 6: second one-way valve; 7: overflow valve. DETAILED DESCRIPTION

[0014] In order to make the technical problems, technical solutions and implementation effects to be solved by the present utility model clearer, the following is a summary of the technical problems, technical solutions and implementation effects of the present utility model. Figure 1 and 2, an embodiment of the utility model is further described. In the description of the utility model, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0015] See attached Figure 1 and 2 The utility model discloses a defrosting and pressure relief system for a cold air machine based on hot fluorine pressure, comprising a hot fluorine pipeline 1, a return air pipeline 2, a liquid supply pipeline 3 and a cold air machine 5, wherein the liquid supply pipeline 3 is connected to the liquid supply inlet of the cold air machine 5 through a liquid supply valve assembly 4, the return air pipeline 2 is connected to the return air port of the cold air machine 5 through a third stop valve 21, a second solenoid valve 23 and a fourth stop valve 24, the hot fluorine pipeline 1 is connected to the hot fluorine defrost inlet of the cold air machine 5 through a first stop valve 11, a first filter 12, a first solenoid valve 13 and a second stop valve 14, and the hot fluorine defrost outlet is connected to the return air pipeline 2 of the return air port of the cold air machine 5 through a second one-way valve 6.

[0016] As a preferred embodiment, the liquid supply valve assembly 4 includes a fifth stop valve 41, a second filter 42, a third solenoid valve 43, a first one-way valve 44, a straight-through throttle valve 45 and a sixth stop valve 46. Along the flow direction of the refrigerant in the liquid supply pipeline 3, the fifth stop valve 41, the second filter 42, the third solenoid valve 43, the first one-way valve 44, the straight-through throttle valve 45 and the sixth stop valve 46 are installed on the liquid supply pipeline 3 in sequence, wherein the straight-through throttle valve 45 controls the flow rate of the refrigerant in the liquid supply pipeline 3, the third solenoid valve 43 controls the on-off condition of the refrigerant flow in the liquid supply pipeline 3, the second filter 42 filters and dries the refrigerant in the liquid supply pipeline 3, and when the air cooler 5 is in normal refrigeration operation, the fifth stop valve 41 and the sixth stop valve 46 are in a normally open state, and the liquid supply valve assembly 4 of the liquid supply pipeline 3 can be inspected and maintained in time through the fifth stop valve 41 and the sixth stop valve 46.

[0017] As a preferred embodiment, the inlet pipe and outlet pipe of the second solenoid valve 23 are respectively connected to the inlet and outlet of the pneumatic valve 22 through pipes, and the pneumatic valve 22 and the second solenoid valve 23 are installed in parallel on the return air pipe 2. The pressure difference controller of the pneumatic valve 22 is connected to the hot fluorine defrost pipe between the first filter 12 and the first solenoid valve 13 through a pipe. If the air cooler 5 is in normal refrigeration operation, the second solenoid valve 23 is opened and the pneumatic valve 22 is in an unpowered state, that is, the pneumatic valve 22 is in a normally open state.

[0018] As a preferred embodiment, a leakage pipe is installed between the liquid supply pipe 3 and the return air pipe 2, and the overflow valve 7 is installed on the leakage pipe. One end of the leakage pipe is connected to the liquid supply pipe 3 of the liquid supply inlet of the cold air machine 5, and the other end of the leakage pipe is installed on the return air pipe 2 between the third stop valve 21 and the second solenoid valve 23. When the cooling capacity required by the cold air machine 5 is reduced or the refrigerant supply in the liquid supply pipe 3 is large, the opening degree of the overflow valve 7 is determined according to the pressure of the refrigerant medium in the liquid supply pipe 3, and the excess refrigerant is transported to the return air pipe 2 along the leakage pipe to avoid over-cooling of the cold air machine 5.

[0019] As a preferred embodiment, the defrosting and pressure relief system for a cold air machine based on hot fluorine pressure, when the system is in normal refrigeration operation conditions, the liquid supply valve assembly 4 and the second solenoid valve 23 are both in an open state, the first solenoid valve 13 is closed, the pneumatic valve 22 is in an unpowered state, the liquid supply pipeline 3 transports the refrigerant to the cold air machine 5 for refrigeration, and the return air pipeline 2 transports the vaporized refrigerant to the compressor. According to the pressure change of the refrigerant medium in the liquid supply pipeline 3, the overflow valve 7 transports the excess refrigerant along the leakage pipeline to the return air pipeline 2 to avoid excessive pressure on the cold air machine 5. The occurrence of cold phenomenon; when the system needs to perform hot fluorine defrosting, the first solenoid valve 13, the second solenoid valve 23 and the third solenoid valve 43 are in a closed state, the pneumatic valve 22 is still in a non-energized state, and the cold air fan 5 operates normally, evaporating and evacuating the liquid refrigerant in the cold air fan 5 and the pipeline. When the evaporation and evacuation of the liquid refrigerant in the cold air fan 5 and the pipeline are completed, the first solenoid valve 13 is opened, the second solenoid valve 23 and the third solenoid valve 43 are still in a closed state, and the pneumatic valve 22 is energized and stops the operation of the cold air fan 5, and the heat discharged by the compressor is discharged. The fluorine medium enters the air cooler 5 along the hot fluorine defrost pipe and is defrosted. The hot fluorine medium discharged from the air cooler 5 passes through the second one-way valve 6 and the fourth stop valve 24 and enters the pneumatic valve 22. At the beginning of the defrost process, the hot fluorine exchanges heat with the frost on the surface of the air cooler 5, so that the pressure of the medium discharged from the air cooler 5 is relatively small, that is, the pressure of the medium entering the pneumatic valve 22 is relatively small, and the opening degree of the pneumatic valve 22 is also relatively large. As the defrost process proceeds, the pressure of the medium discharged from the air cooler 5 gradually increases, and the opening degree of the pneumatic valve 22 gradually increases. When the pneumatic valve 22 is opened, the pressure of the medium discharged from the air cooler 5 increases. 2 is stable at a certain value, it means that the frost on the surface of the air cooler 5 has basically melted and fallen off, indicating that the defrosting process is over; then, the first solenoid valve 13 is closed, the second solenoid valve 23 is opened, the third solenoid valve 43 and the air cooler 5 are still in a closed state, and the pneumatic valve 22 is still in an energized state. At this time, the system enters the pressure relief operation process of the air cooler 5. After the pressure relief operation process of the air cooler 5 is completed, the first solenoid valve 13 is closed, the liquid supply valve assembly 4 and the second solenoid valve 23 are opened, and the pneumatic valve 22 is in a non-energized state, and the system enters normal refrigeration operation conditions.

[0020] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A defrosting and pressure relief system for a cold air machine based on hot fluorine pressure, comprising a hot fluorine pipeline (1), a return air pipeline (2), a liquid supply pipeline (3) and a cold air machine (5), characterized in that: The liquid supply pipeline (3) is connected to the liquid supply inlet of the air cooler (5) through the liquid supply valve assembly (4); the return air pipeline (2) is connected to the return air port of the air cooler (5) through the third stop valve (21), the second solenoid valve (23) and the fourth stop valve (24); the hot fluorine pipeline (1) is connected to the hot fluorine defrost inlet of the air cooler (5) through the first stop valve (11), the first filter (12), the first solenoid valve (13) and the second stop valve (14); the hot fluorine defrost outlet is connected to the return air pipeline (2) of the return air port of the air cooler (5) through the second one-way valve (6).

2. The defrosting and pressure relief system for cold air blowers based on hot fluorine pressure according to claim 1, characterized in that: The liquid supply valve assembly (4) comprises a fifth stop valve (41), a second filter (42), a third solenoid valve (43), a first one-way valve (44), a straight-through throttle valve (45) and a sixth stop valve (46). Along the flow direction of the refrigerant in the liquid supply pipeline (3), the fifth stop valve (41), the second filter (42), the third solenoid valve (43), the first one-way valve (44), the straight-through throttle valve (45) and the sixth stop valve (46) are sequentially installed on the liquid supply pipeline (3).

3. The defrosting and pressure relief system for cold air blowers based on hot fluorine pressure according to claim 1, characterized in that: The inlet pipe and the outlet pipe of the second solenoid valve (23) are connected to the inlet and the outlet of the pneumatic valve (22) respectively through pipes. The pneumatic valve (22) and the second solenoid valve (23) are installed in parallel on the return air pipe (2). The pressure difference controller of the pneumatic valve (22) is connected to the hot fluorine defrosting pipe between the first filter (12) and the first solenoid valve (13) through a pipe.

4. The defrosting and pressure relief system for cold air blowers based on hot fluorine pressure according to claim 1, characterized in that: A leakage pipe is installed between the liquid supply pipe (3) and the return air pipe (2), and the overflow valve (7) is installed on the leakage pipe. One end of the leakage pipe is connected to the liquid supply pipe (3) of the liquid supply inlet of the cold air machine (5), and the other end of the leakage pipe is installed on the return air pipe (2) between the third stop valve (21) and the second solenoid valve (23).

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