Single-machine two-stage screw compression ultra-large ultralow-temperature air source heat pump unit

Abstract

The invention discloses a single-machine two-stage screw compression ultra-large ultralow-temperature air source heat pump unit which comprises a shell and tube condenser, an economizer, a high-pressure liquid storage device, an evaporator, a fin type heat exchanger, a four-way valve and a single-machine two-stage compressor. The economizer is provided with one inlet and two outlets, one outlet of the economizer is communicated with an inlet of the high-pressure liquid storage device through a pipeline, an electronic expansion valve B is installed on the pipeline, and the other outlet of the economizer is connected with an air suction port B of the single-machine two-stage compressor through a pipeline; a low-pressure compressor cavity and a high-pressure compressor cavity are arranged in the single-machine double-stage compressor, a pair of male and female rotors meshed with each other is arranged in each compressor cavity, an air suction port B is formed in the low-pressure compressor cavity, and an air suction port A is formed in the high-pressure compressor cavity. The single-machine two-stage screw compression technology and the air supply enthalpy increasing technology are combined, the enthalpy value of a refrigerant after heat absorption in the ultralow-temperature environment is increased, the energy efficiency ratio of the unit is increased, and high-quality operation of the unit in the ultralow-temperature environment is achieved.

Description

technical field [0001] The invention relates to an air source heat pump unit, in particular to a single-machine two-stage screw compression super-large ultra-low temperature air source heat pump unit, which belongs to the technical field of heat pump units. Background technique [0002] At present, heat pumps are mainly divided into three categories: water source heat pumps, ground source heat pumps and air source heat pumps. Among them, air source heat pumps are subject to the smallest conditions, the largest development space, and the widest application range. The air source heat pump unit can absorb low-grade energy from the atmospheric environment and convert it into high-grade energy for heating and heating. Compared with heating and heating by gas or coal-fired boilers, it has high energy utilization efficiency and less environmental pollution. At the same time, the air source heat pump unit, due to its simple and flexible installation and strong environmental adaptabi...

AI Technical Summary

Problems solved by technology

In very low outdoor temperature, the compressor will automatically shut down for protection against overheating, which makes the heat pump only operate at not too low outdoor air temperature;

(3) Due to the increase of the compressor pressure ratio, the coefficient of performance (COP) of the system drops sharply

[0004] In summary, the traditional air source heat pump obviously has inconvenience and defects in actual use, so it is necessary to propose a new type of heat pump unit to solve the bottleneck in the existing technology

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