Sleeve-type heat pump capable of realizing direction changing of working medium

Abstract

The invention discloses a sleeve-type heat pump capable of realizing direction changing of a working medium and belongs to the technical field of electrical equipment and electrical engineering. The sleeve-type heat pump comprises a compressor, a heat pump reversing valve, a self-circulation sleeve-type heat exchanger, an expansion valve, an evaporator and a water storage tank, the self-circulation sleeve-type heat exchanger comprises N heat exchange sleeves in parallel arrangement, each heat exchange sleeve comprises a pipe side and a shell side, and the pipe sides are serially connected through a pipe side three-way pipe which is communicated with the water storage tank; a water inlet of each heat exchange sleeve is communicated with a water source pipe and the water storage tank, the shell sides are serially connected through a shell side connecting pipe, and the compressor, the heat pump reversing valve, the shell sides of the heat exchange sleeves, the expansion valve and the evaporator are sequentially connected to form a coolant circulating loop. By the sleeve-type heat pump, a coolant working medium can be made to change direction to do work to achieve the objective of self-circulation heat exchange according to water flow direction without arranging a circulating water pump, and heat exchange efficiency and rate are improved effectively.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment and electrical engineering, and relates to a water heater, in particular to a heat pump water heater which improves heat exchange efficiency by changing the flow direction of refrigerant working fluid and water flow. Background technique [0002] At present, the condenser technology of heat pump water heaters on the market generally uses several methods of casing, inner coil of the water tank and outer coil of the water tank. [0003] Although the casing heat exchanger in the prior art has a simple structure and small size, it needs to match the circulating water pump and complex waterway design in the work. Since the water pump consumes about 5% of the electric energy equivalent to the compressor, the efficiency is generally not high, and it is expensive and complicated. The characteristics make it generally used in commercial machines; the inner coil of the water tank is installed a...

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Problems solved by technology

[0003] Although the casing heat exchanger in the prior art has a simple structure and small size, it needs to match the circulating water pump and complex waterway design in the work. Since the water pump consumes about 5% of the electric energy equivalent to the compressor, the efficiency is generally not high, and it is expensive and complicated. The characteristics make it generally used in commercial machines; the inner coil of the water tank is installed and fixed inside the water tank, and the heat transfer rate is high, but it is easy to scale and affect the thermal efficiency after long-term use. Although most of them are equipped with built-in magnesium rods to reduce scaling and corrosion, but However, it failed to completely eliminate the occurrence of scale and corrosion. The life of the water tank is slightly short, and the magnesium rod needs to be replaced regularly to remove dirt and sediment. Although the outer coil is safe, it has low thermal efficiency and slow heating. Due to repeated effects of thermal expansion and contraction, The coil wall is easy to separate, and the inner liner is easy to burst. To overcome the problem, the technology required is high, the production is difficult and the cost is expensive.

[0004] In addition, the volume of the heat pump condensing heat exchanger and its matching water tank made by the existing technology is too large, which is unacceptable to most consumers; and the unreasonable setting of the condensing heat exchanger will cause the compressor to work under high load for a long time, which will accelerate the lubrication of the compressor. The cracking and aging of oil shortens the working life of the compressor

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