Ultralow-temperature water steam capturing pump pipeline system applying refrigerating medium for cold storage

Abstract

The invention provides an ultralow-temperature water steam capturing pump pipeline system applying a refrigerating medium for cold storage. A compressor is included. The discharging end of the compressor is connected with an oil separator. The oil separator is connected with a condensation pipeline and a hot tank pipeline through a third three-way electromagnetic valve. The free end of the condensation pipeline is connected with a second tee joint. The second tee joint is connected with a main return pipe connected with the material return end of the compressor. The surplus cooling capacity isstored in the refrigerating medium, the situation that due to overcooling of the system, the temperature and pressure of an air suction port of the compressor are low, and consequently the compressorshuts down is avoided, accordingly, the system further stably runs, and the service life of equipment is prolonged. Under the situation of the heating temperature for reaching the same refrigeratingtemperature, the work load of the compressor is reduced, and energy usage is saved. Meanwhile, the high-specific-heat-capacity liquid refrigerating medium is used for cooling a load cold trap, accordingly, the cooling speed of the cold trap is increased, then, water steam is more rapidly captured, and the work efficiency of the vacuum coating industry is improved.

Description

Technical field [0001] The invention relates to the field of refrigeration, in particular to an ultra-low temperature water vapor trap pump pipeline system using a refrigerant carrier for cold storage. Background technique [0002] The ultra-low temperature water vapor trap pump currently used in China uses a self-cascade refrigeration cycle to reduce the refrigerant to an ultra-low temperature, and then pass the low-temperature refrigerant into the load cold trap. When the load cold trap is cooled to a certain temperature, the load can be The water vapor in the cavity space outside the cold trap is adsorbed on the outer surface of the load cold trap, so that the inside of the cavity can obtain a higher degree of vacuum under the action of the vacuum pump. In the process of long-term standby operation of the capture pump equipment, the temperature at the end can reach -150℃ or even lower, and the too low cryogenic temperature reflects that the equipment system is in a highly supe...

AI Technical Summary

Problems solved by technology

[0004] 1. The temperature of the suction port of the compressor is too low, which increases the probability of liquid shock of the compressor, which is not conducive to the normal and reliable operation of the compressor and is easy to form a large amount of frost outside the suction port of the compressor

[0005] 2. The equipment system is in a highly supercooled state for a long time, which will cause the pressure at the suction port of the compressor to be low and generate a low pressure alarm, resulting in the shutdown of the compressor and reducing the service life of the equipment

[0006] 3. When the pressure on the connecting parts of the load cold trap and the equipment reaches 3Mpa, and the temperature of the connecting parts changes between -150°C and +50°C, thermal expansion and contraction will occur, which will easily cause the refrigerant to leak there

Once the mixed refrigerant used by the equipment leaks, it will destroy the internal balance of the system. At this time, it is necessary to replace a complete set of mixed refrigerant with high cost to stabilize the system.

[0007] 4. During the heating and defrosting process of the equipment, when the lubricating oil used by the compressor enters the load cold trap directly with the refrigerant in gaseous form, part of the oil vapor is cooled near the refrigeration solenoid valve, causing the refrigeration solenoid valve to fail.

[0008] 5. During the actual use of the equipment, the load cold trap needs to be refrigerated and heated in stages. When heating and defrosting, the refrigerant will bring heat back to the equipment system, which increases the workload of the compressor.

The refrigerant entering the load cold trap mainly exists in a gas-liquid two-phase state, so that the cooling speed of the load cold trap is not enough to improve the working efficiency of the vacuum coating industry

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