A direct heating type heat pump water heater multi-process three-tube heat exchanger

Abstract

The invention discloses a multi-flow-path three-casing-pipe heat exchanger of a direct heating type heat-pump water heater. The heat exchanger comprises a hot water outlet, a refrigerant gas inlet, a cold water inlet, a refrigerant liquid outlet and a multi-flow-path casing-pipe heat-exchange pipe; the multi-flow-path casing-pipe heat-exchange pipe comprises a first casing pipe, a second casing pipe, a third casing pipe, a first separating plate and a second separating plate; two ends of the third casing pipe are closed; the second casing pipe with the two ends connected with the upper end and the lower end of the third casing pipe in a sealed and fixed manner is arranged in the third casing pipe; and the second casing pipe and the third casing pipe are fixedly connected with each other through the first separating plate and the second separating plate which are arranged symmetrically. Compared with the prior art, the multi-flow-path casing-pipe heat-exchange pipe can enhance the heat exchange effect, the function that the direct heating type heat-pump water heater can be used immediately after being started is realized, the problem about placing of a sensor and an interface can be solved by the aid of the design of a casing, the whole structure of the unit is compact, and heat dissipation in the hot water delivery process can be reduced.

Description

【Technical field】 [0001] The invention relates to a multi-flow three-pipe heat exchanger for a direct heating type heat pump water heater. 【Background technique】 [0002] The heat pump hot water unit uses the reverse Carnot principle to transfer the heat in the air to the water through the compressor to increase the water temperature, thereby meeting the hot water demand of users. It has the advantages of high efficiency, energy saving, and environmental protection. A new generation of hot water production devices after boilers, gas water heaters, electric water heaters and solar water heaters. Compared with circulating hot water units that need to circulate and heat domestic water, the heating time is longer, and require a specific hot water storage tank, the advantage of direct heating heat pump hot water units is that they can directly heat water to the required temperature, with With the characteristics of large temperature difference and small flow rate, the hot water ...

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Problems solved by technology

[0003] However, there are the following problems in actual production and application: a. When direct heating heat pump water heaters use casing heat exchangers for heat exchange, ordinary casing heat exchange tubes with a short process flow are used, and the heat exchange area is small and the heat exchange efficiency is low. Lower, forming a smaller temperature difference, the outlet water temperature is lower and cannot be used directly

In order to meet the requirements of instant use, it is necessary to increase the heat exchange tube material, so that the volume of the water heater is too large, more materials are consumed, and the economy and convenience are reduced; b. Heat pump water heaters need to be equipped with more sensors, such as temperature sensors, pressure sensors, etc. , it is difficult to install between the casing heat exchange tube intervals, and it is often installed on the side of the heat exchanger, and multiple interfaces for refrigerant in and out and domestic water in and out are also installed on the side of the heat exchanger, resulting in heat exchanger insulation layer and Water heater shell sealing, integrity reduction

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