Flooded scroll heat pump water heater and operating method thereof

Abstract

The invention discloses a flooded vortex heat-pump hot-water machine comprising a scroll compressor, an oil separator, a condenser, a plate-type evaporator, an electronic expansion valve, a flooded evaporator, a capillary tube and an aspirating tube. The scroll compressor, the oil separator, the condenser, the plate-type evaporator, the electronic expansion valve, the flooded evaporator and the aspirating tube are sequentially communicated end to end through pipelines. The middle or lower parts of an inner pipeline of the flooded evaporator are communicated with the plate-type evaporator through the capillary tube, and one side of the upper end of the plate-type evaporator is further communicated with the aspirating tube. By the adoption of the structure that the plate-type evaporator is connected with the flooded evaporator through the capillary tube, the problem that recycling of lubricating oil is difficult in the scroll compressor mounted in an air source heat pump group is solved. By the adoption of the double-evaporator structure, chilled water consumption of the flooded evaporator is reduced through shunt of the plate-type evaporator, suction temperature is raised, temperature difference of exhaust and suction is reduced, and input power when the compressor operates is lowered.

Description

technical field [0001] The invention relates to the technical field of air source heat pumps, in particular to a flooded vortex heat pump water heater and an operating method thereof. Background technique [0002] At present, the compressor is particularly important in the air source heat pump unit, and the performance of the compressor directly determines the overall performance of the air source heat pump unit. An existing scroll compressor is a compressor with a compressible volume composed of a fixed involute scroll and an eccentrically orbiting and translationally moving involute scroll. The unique design of the scroll compressor makes it an energy-saving compressor in the world today. The scroll compressor, the main operating part of the scroll compressor, is only dirty and has no wear and tear, so it has a longer life, and is known as a maintenance-free compressor. The scroll compressor runs smoothly, has little vibration, and has a quiet working environment, and is...

AI Technical Summary

Problems solved by technology

Although this kind of scroll compressor has many advantages, it is difficult to apply it to the air source heat pump unit, because a large amount of lubricating oil needs to be injected into the scroll compressor body, and when the air source heat pump unit is working, the scroll The refrigerant vapor with fast flow rate and high temperature is discharged from the scroll compressor. In this way, part of the lubricating oil on the cylinder wall of the scroll compressor will inevitably form oil vapor and oil droplets and particles due to the high temperature of the refrigerant vapor. The refrigerant vapor is discharged together, and the higher the exhaust temperature and the faster the flow rate, the more lubricating oil will be discharged, so that the lubricating oil in the scroll compressor will be gradually reduced and brought into other air source heat pump unit components by the refrigerant , so that the scroll compressor is damaged

At present, there is a technology of installing an oil separator between the compressor outlet and the condenser inlet to solve this problem, but after long-term experiments and applications of air source heat pump units, after the refrigerant vapor passes through the oil separator, there will still be A small part of oil vapor and oil droplets are brought into the evaporator, and oil accumulation is formed on the inner wall of the evaporator, which shortens the service life of the scroll compressor, and the inside of the evaporator is prone to oil clogging, which makes the entire air Scroll compressors with better performance are not used in the field of source heat pumps

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