Heat pump, heat pump air conditioner and heat pump water heating unit sequentially using single/double stage compression

Abstract

The invention relates to a heat pump, a heat pump air conditioner and a heat pump water heating unit sequentially using single / double stage compression. The heat pump comprises a condenser, a throttling device, an evaporator and a compressor unit which are sequentially connected through refrigerating agent pipelines, wherein a heat absorption device of the evaporator is positioned in a low-temperature heat source, the condenser is positioned in a heated medium, the compressor unit is connected with a control device, and the control device is used for controlling the compressor unit to carry out single-stage parallel compression or recombining the compressor unit to carry out two-stage series compression. According to the invention, a classification recombination method is adopted by the compressor, the single / double compression is sequentially used, the 'three-high and one-low' technical problems that the air suction and exhaust differential pressure of the compressor is increased, the compression ratio is increased, the air exhaust temperature of the compressor is increased, and the heating efficiency is reduced are improved and solved under the conditions of lower environment temperature and higher heated medium temperature, and the energy in the air can be efficiently absorbed.

Description

technical field [0001] The invention relates to a heat pump, in particular to a heat pump, a heat pump air conditioner and a heat pump water heating unit which are sequentially used in single and double stage compression. Background technique [0002] A heat pump is a thermal device that transfers heat energy from a low-temperature heat source to a high-temperature heat source through the evaporation and condensation of a working fluid. The low-temperature heat sources usually used in heat pump installations are the media around us - air, river water, sea water, urban sewage, surface water, ground water, reclaimed water, fire pools, or media discharged from industrial production equipment. At present, heat pumps can be used to heat media such as water and oil. However, in the existing heat pump system, the single-stage compression method is mainly used. If the temperature of the low-temperature heat source is low and the temperature of the heated medium is high, the evapora...

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Problems solved by technology

[0014] The purpose of the present invention is to provide a heat pump with single-stage and double-stage compression sequentially used to solve the technical problem of heating high-temperature medium under low-temperature conditions that cannot be satisfied by a single-stage compressed air source heat pump system;

[0015] The purpose of the present invention is also to provide a heat pump air conditioner with single-stage and double-stage compression sequentially used to solve the problem that the single-stage compressed air source heat pump system in the prior art cannot solve the problem of rising suction and exhaust pressure differences and compression problems during the heating operation of the air conditioner in cold winter. The technical problems of "three highs and one low" of ratio increase, compressor exhaust temperature increase, and heating efficiency decrease;

[0016] The purpose of the present invention is also to provide a heat pump hot water unit with single-stage and double-stage compression sequentially used to solve the problem of rising suction-exhaust pressure difference and compression of the single-stage compressed air source heat pump system in the prior art during heating operation in cold winter. The "three highs and one low" technical problems of higher ratio, higher compressor exhaust temperature, and lower heating efficiency, in order to meet the production of high-temperature sanitary hot water in cold winter

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