Low-temperature vortex type air-cooled compression condensing unit with forward defrosting function

Abstract

The utility model relates to a low-temperature vortex type air-cooled compression condensing unit with a forward defrosting function, which comprises an anti-explosion compressor, an oil separator, an anti-explosion air-cooled condenser, a regenerative gas-liquid separator, an anti-explosion cooling fan and a liquid storage device, the oil separator is respectively connected with the explosion-proof air-cooled condenser and the heat regeneration type gas-liquid separator, the heat regeneration type gas-liquid separator is respectively connected with the explosion-proof compressor and the explosion-proof cooling fan, the explosion-proof cooling fan is connected with the liquid storage device, and the liquid storage device is connected with the explosion-proof air-cooled condenser. The defrosting time can be set by controlling the opening and closing time of the defrosting electromagnetic valve, so that defrosting of the inner surface and the outer surface of the explosion-proof cooling fan is achieved, safety and energy conservation are achieved, the problem that the inner surface and the outer surface of the explosion-proof cooling fan for the low-temperature refrigeration house are frosted is solved, and continuous and stable operation of a system is guaranteed.

Description

Technical Field

[0001] The utility model relates to an air-cooled compression condensing unit, in particular to a low-temperature vortex air-cooled compression condensing unit with a forward defrosting function. Background Art

[0002] Generally, the storage temperature of low-temperature cold storage is below -25℃, and the evaporation temperature of explosion-proof air coolers is below -35℃. This requires the air-cooled compression condensing unit to work under low-temperature conditions. When the unit works under low-temperature conditions, frost will form on the inner and outer surfaces of the explosion-proof air cooler. If it is not defrosted in time, the working efficiency of the unit will be reduced.

[0003] Currently, most explosion-proof air conditioners use water defrosting or electric heating to defrost. Water defrosting takes a long time, and if the defrost water is not discharged in time, it will cause secondary ice blockage. If electric heating is used to defrost, energy consumption is high, it is not energy-saving, and it may be unsafe. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an energy-saving, safe, and unrestricted air-cooled scroll compression condensing unit for low-temperature cold storage with a self-defrosting function, which solves the problem of frost on the inner and outer surfaces of explosion-proof air coolers used in low-temperature cold storage.

[0005] The utility model is achieved through the following technical solutions:

[0006] The defrosting method of the unit is to use the forward defrosting method, which mainly uses the hot air in the system to be introduced into the evaporator, and the gaseous Freon in the evaporator (explosion-proof air cooler) exchanges heat with the air inside the storage body. The Freon evaporates in the evaporator, absorbs the heat of the storage body, and cools the air in the storage body, achieving the purpose of cold storage.

[0007] Due to the humidity in the air and low temperatures, frost will gradually form in explosion-proof air coolers. Conventional defrosting methods, such as forced air cooling and electric heating, are often used. However, these methods have many drawbacks, so direct hot freon defrosting is used. The principle is to direct high-temperature, high-pressure Freon gas into the evaporator through a solenoid valve. After being compressed by an explosion-proof compressor, the high-temperature condensed gas passes through the evaporator (condensing fan) to heat and melt the frost in the explosion-proof air cooler.

[0008] In summary, the utility model provides a low-temperature scroll air-cooled compression condensing unit with a forward defrost function, including an explosion-proof compressor, an oil separator, an explosion-proof air-cooled condenser, a heat-recovery type gas-liquid separator, an explosion-proof cold air blower and a liquid reservoir. The explosion-proof compressor is connected to the oil separator, and the oil separator is respectively connected to the explosion-proof air-cooled condenser and the heat-recovery type gas-liquid separator, and the heat-recovery type gas-liquid separator is respectively connected to the explosion-proof compressor and the explosion-proof cold air blower, the explosion-proof cold air blower is connected to the liquid reservoir, and the liquid reservoir is connected to the explosion-proof air-cooled condenser.

[0009] Furthermore, a defrost solenoid valve is provided on the connecting pipeline between the oil separator and the heat recovery type gas-liquid separator.

[0010] Furthermore, the heat recovery type gas-liquid separator is connected to the explosion-proof cold air blower through a return air pipeline and a defrost pipeline respectively. A return air ball valve is provided on the return air pipeline, and a defrost ball valve is provided on the defrost pipeline.

[0011] Furthermore, an expansion valve, a liquid supply ball valve, a sight glass, a liquid supply solenoid valve, and a drying filter are sequentially arranged on the connecting pipeline between the explosion-proof cold air blower and the liquid reservoir.

[0012] The beneficial effects of the utility model are as follows: the utility model can set the defrost time by controlling the switching time of the defrost solenoid valve, thereby achieving defrosting of the inner and outer surfaces of the explosion-proof cold air blower, which is safe and energy-saving, thereby solving the problem of frosting on the inner and outer surfaces of the explosion-proof cold air blower used in low-temperature cold storages and ensuring the continuous and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural principle diagram of a low-temperature scroll air-cooled compression condensing unit with a forward defrosting function according to the present invention. DETAILED DESCRIPTION

[0014] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0015] like Figure 1The low-temperature scroll air-cooled compression condensing unit with a forward defrost function shown in the figure includes an explosion-proof compressor 1, an oil separator 2, an explosion-proof air-cooled condenser 3, a heat-recovery gas-liquid separator 4, an explosion-proof cold air blower 5 and a liquid reservoir 6. The explosion-proof compressor 1 is a scroll explosion-proof compressor. The explosion-proof compressor 1 is connected to the oil separator 2. The oil separator 2 is respectively connected to the explosion-proof air-cooled condenser 3 and the heat-recovery gas-liquid separator 4. A defrost solenoid valve 9 is provided on the connecting pipeline between the oil separator 2 and the heat-recovery gas-liquid separator 4. The heat-recovery gas-liquid separator 4 is connected to the explosion-proof air-cooled condenser 3 and the heat-recovery gas-liquid separator 4. The device 4 is respectively connected to the explosion-proof compressor 1 and the explosion-proof cold air fan 5. The heat recovery type gas-liquid separator 4 is respectively connected to the explosion-proof cold air fan through the return air pipeline and the defrost pipeline. The return air pipeline 12 is provided with a return ball valve, and the defrost pipeline is provided with a defrost ball valve 13. The explosion-proof cold air fan 5 is connected to the liquid reservoir 6. The connecting pipeline between the explosion-proof cold air fan 5 and the liquid reservoir 6 is sequentially provided with an expansion valve 11, a liquid supply ball valve 14, a sight glass 10, a liquid supply solenoid valve 8, and a drying filter 7. The liquid reservoir 6 is connected to the explosion-proof air-cooled condenser 3.

[0016] The working principle of this utility model is as follows:

[0017] Refrigeration cycle: The Freon compressed by the explosion-proof compressor 1 is connected to the explosion-proof air-cooled condenser 3 through the oil separator. After the Freon is condensed by the explosion-proof air-cooled condenser 3, the Freon enters the liquid reservoir 6, and then the liquid reservoir 6 passes through the drying filter 7, the liquid supply solenoid valve 8, and the sight glass 10 to enter the explosion-proof cold air blower 5 to cool the cold storage;

[0018] Defrost cycle: The Freon compressed by the explosion-proof compressor 1 is connected to the liquid supply solenoid valve 8 through the oil separator 2. Thereafter, the hot fluorine Freon gas exchanges heat with the frost on the surface of the internal explosion-proof air cooler 5, and the cold frost therein is melted. Then, the gas enters the explosion-proof compressor 1 after heat exchange through the heat-recovery type gas-liquid separator 4. During the defrost process, the return air pipeline between the explosion-proof air cooler 5 and the heat-recovery type gas-liquid separator 4 exchanges heat with the hot fluorine gas that has passed through high temperature and high pressure in the heat-recovery type gas-liquid separator 4 to prevent "liquid backflow" from affecting the explosion-proof compressor 1.

[0019] The utility model switches the liquid supply solenoid valve and the defrost solenoid valve with each other, controls the flow direction of Freon, and better achieves the effect of hot fluorine defrosting liquid supply, ensures stable operation and realizes the function of continuous defrosting.

[0020] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A low-temperature scroll air-cooled compression condensing unit with a forward defrost function, characterized by: It includes an explosion-proof compressor, an oil separator, an explosion-proof air-cooled condenser, a heat-recovery gas-liquid separator, an explosion-proof air cooler and a liquid reservoir. The explosion-proof compressor is connected to the oil separator, and the oil separator is respectively connected to the explosion-proof air-cooled condenser and the heat-recovery gas-liquid separator. The heat-recovery gas-liquid separator is respectively connected to the explosion-proof compressor and the explosion-proof air cooler. The explosion-proof air cooler is connected to the liquid reservoir, and the liquid reservoir is connected to the explosion-proof air-cooled condenser.

2. The low-temperature scroll air-cooled compression condensing unit with a forward defrost function according to claim 1, characterized in that: A defrost solenoid valve is provided on the connecting pipeline between the oil separator and the heat recovery type gas-liquid separator.

3. The low-temperature scroll air-cooled compression condensing unit with a forward defrost function according to claim 2, characterized in that: The heat recovery type gas-liquid separator is connected to the explosion-proof cold air blower through a return air pipeline and a defrost pipeline respectively. A return air ball valve is provided on the return air pipeline, and a defrost ball valve is provided on the defrost pipeline.

4. The low-temperature scroll air-cooled compression condensing unit with a forward defrost function according to claim 3, characterized in that: An expansion valve, a liquid supply ball valve, a sight glass, a liquid supply solenoid valve, and a drying filter are sequentially arranged on the connecting pipeline between the explosion-proof cold air blower and the liquid storage device.

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