Heat pump water heater

Abstract

The invention relates to a water storage type heat pump water heater, including a compressor, a heat exchange coil, an expansion valve, an evaporator, a closed tank equipped with an intake pipe and a rising pipe and positive and negative electrodes insulated with each other, which are circularly connected in turn, wherein the heat exchange coil comprises an inner pipe containing heat pump cycle fluid and an outer pipe sleeved on the inner pipe, the outer wall of the inner pipe and the inner wall of the outer pipe are closely jointed, at least one channel which connects ports at two ends of the outer pipe is embraced between the outer wall of the inner pipe and the inner wall of the outer pipe, a channel outlet is embraced between at least one end of the ports at two ends of the outer pipe and the outer wall of the inner pipe, and the port comprising the channel outlet is positioned at one side outside a water tank at the joint part between the heat exchange coil while being mounted and the hot water tank; and the positive and negative electrodes are arranged at a position where the electrodes can contact with the effluent passing the channel outlet. The invention can give an alarm immediately when the outer pipe of the heat exchange coil is corroded and penetrated, reliably prevent the cycle fluid in the water heater from leaking into the water tank of the water heater as the heat exchange coil is corroded and penetrated, avoid water pollution of the water tank, and have timely, simple and reliable alarming mode.

Description

technical field [0001] The invention relates to a water heater, in particular to a water storage heat pump water heater. Background technique [0002] The heat pump is an important high-temperature heat source. By consuming a certain amount of energy (such as electric energy, etc.), the compressor is used to drive the refrigerant circulating in the heat exchange system, and the refrigerant is transferred from low-temperature heat sources (such as groundwater, river seawater, sewage, natural air, etc.) It absorbs heat energy, converts it into higher temperature heat energy, and outputs it to the water or ambient air required by people to meet people's needs for heat energy. Such as water storage heat pump water heater is a commonly used heat pump water heater. [0003] like figure 1 As shown, in a common water storage type heat pump water heater, the condenser coil 5 (that is, the heat exchange coil) is placed in the water tank 7 of the hot water storage, and the condenser ...

AI Technical Summary

Problems solved by technology

Because the water usually used in the water tank contains corrosive substances, these corrosive substances will cause corrosion to the condenser coil 5 during long-term use, and when the corrosion reaches a certain level, the condenser coil 5 of this single-layer structure will be perforated

Since the condenser coil 5 works under high temperature and high pressure, once the condenser coil 5 is corroded and perforated, the high-pressure circulating working fluid in the coil will leak into the water of the water heater tank 7 along the corroded perforation, causing pollution

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