Water source heat pump units capable of automatically backwashing sewage water

Abstract

A water source heat pump unit automatically back washing sewage relates to the air conditioner technology field. The invention comprises a compressing evaporating and condensing unit composed of a compressor, a condenser, an expander, an evaporator and a four-way valve. The structure is characterized in that a water supply line of the evaporator is provided orderly with a filter one, a water pump, a three-way valve and a filter two connected in series with a sewage source. A water return pipe line of the evaporator is provided orderly with a motorized valve two connected in series with a drain water pond. A pressure difference sensor is connected in parallel between an inlet and an outlet of the evaporator. A motorized valve one is connected in parallel between the connection of the filter and the three-way valve and the outlet of the motorized valve. Another outlet of the three-way valve is connected with the outlet end of the motorized valve. The evaporator is provided with a blow off pipe on a top end wherein a motorized valve three is arranged. Compared with prior art, the invention is capable of directly exchanging heat between the industrial sewage or the reclamation of sewage and the refrigerant heat interchanger, which reduces temperature difference of heat transfer, improves the efficiency of the unit and reduces the cost of the device.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a water source heat pump unit that uses sewage as a water source and can be automatically backwashed. Background technique [0002] The water source heat pump is a heat pump type integrated water-water / water-air air conditioning device that uses water as the medium for refrigeration / heating cycles. The water source heat pump unit uses water as the heat source when heating, and uses water as the heat exhaust source when cooling. The advantages of using water as a heat source are: the heat capacity of water is large, the heat transfer performance is good, the amount of water required to transfer a certain amount of heat is small, the size of the heat exchanger is compact, and the cost per square meter of building area is less than that of air-air heat pumps , and will not frost, the water temperature changes relatively small, and the operating conditions are stable. Wate...

AI Technical Summary

Problems solved by technology

Water source heat pump units can use seawater, lake water, river water, groundwater and geothermal tail water. At present, groundwater is the most commonly used, but the groundwater recharge technology is not yet mature, and it is unpredictable whether it will pollute and damage precious groundwater resources.

The water source heat pump unit can also use industrial wastewater and sewage resources, but when using sewage resources, an intermediate heat exchanger must be added to prevent the sewage from corroding the heat exchanger, which increases the heat transfer temperature difference of the heat exchanger and reduces the temperature of the unit. efficiency, but also increases the cost of the unit

Images