Constant-temperature variable energy-saving water heater

Abstract

The invention disclose an constant-temperature variable energy-saving water heater, which comprises a system control device and a heat pump system, wherein the system control device is arranged on a water storage tank; the heat pump system consists of a compressor, an evaporator, a throttle valve and a condenser and is provided with a first waterway pipe and a second waterway pipe which are communicated with a cold water main pipe; the other end of the first waterway pipe is communicated with a cold-hot water mixing valve, and a first waterway switching valve is arranged in a path from the other end of the first waterway pipe to the cold-hot water mixing valve; a second waterway switching valve is arranged in a hot water outlet pipe; the other end of the second waterway pipe is communicated with the second waterway switching valve, and a recycle pump, a flow transducer, the condenser, an outflow water temperature detector and a third water-path switching valve are connected in turn ina path from the other end of the second water pipe to the second waterway pipe; and an outflow hot water branched pipe is connected between the water storage box and the first waterway switching valve. The water heater has the advantages of one-time heating type and recycling heating type water heaters; and even if a great amount of hot water is used, the hot water flows outside according to a set temperature without interruption.

Description

technical field [0001] The invention relates to a water heater, in particular to an energy-saving water heater with a constant temperature variable. Background technique [0002] In the current market of small household heat pump water heaters, static heating (that is, heat exchange copper tubes placed inside the water tank or copper tubes coiled on the outer wall of the water tank) water heaters are dominant, and there are also a small number of circulating heating types and one-time instant heating types. water heater. The Chinese utility model patent "a household type integral heat pump water heater" (utility model patent number ZL200920070873.4, publication number CN201396932) discloses a static heating heat pump water heater, and the Chinese invention patent application "circulating air-conditioning condensing waste heat water heater" ( Invention patent application number 200910038076.2, publication number CN101520226) discloses a circulating heating heat pump water he...

AI Technical Summary

Problems solved by technology

For example, static heating water heaters and circulating heating water heaters are heat storage types, both of which can use valley electricity to store hot water. The static heating type has lower heat exchange efficiency and longer heating time than the circulating heating type. A large pressurized water storage tank can ensure the daily hot water consumption, occupying a large living space of the user

However, when the heat storage water tank uses a large amount of hot water, the cold water end will automatically replenish water, resulting in the phenomenon of mixing hot and cold water, resulting in the inability to fully utilize the hot water

If the unit is not properly selected, it will also make the user feel that when the hot water is used in large quantities, the temperature of the hot water will suddenly drop and warm water will appear, and the temperature will even become lower and lower until it cannot be used.

One-time instant heating does not need a hot water tank, and high-temperature hot water can be generated by turning on the hot water supply end when in use, but the unit configuration must be large enough to meet the hot water demand, which increases the user's investment in disguise

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