Three-purpose heat pump water heating machine and its control method

Abstract

The invention relates to a three-use heat pump water heater and a control method thereof. The heat pump water heater comprises a compressor, a hot water tank, a heat exchanger for heating water, a four-way valve, a heat exchanger for absorbing and discharging heat from and to the outside environment, a filtering device, a throttle device, a heat exchanger for refrigerating and warming, and a gas-liquid separating device which are communicated with each other by pipelines. The compressor and other components and devices receive a command from a central controller and act according to the command, the pipelines are sequentially communicated with the compressor, the heat exchanger for heating water, the D port of the four-way valve, the C port of the four-way valve, the heat exchanger for absorbing and discharging heat from and to the outside environment, the filtering device, the throttle device, the heat exchanger for refrigerating and warming, the E port of the four-way valve, the S port of the four-way valve and the gas-liquid separating device and then communicated with the compressor again. The control method is as below: when the heat pump water heater operates, refrigerant passes through the three heat exchangers, the start and the stop of the operation are determined by the operation mode and the achievement of a state goal, and the switch between the operation mode and the operation state is automatically realized by the cooperation of the four-way valve with other components.

Description

technical field [0001] The invention relates to a heat pump water heater, in particular to a heat pump water heater which can be used for daily hot water production, refrigeration and air conditioning, and heating and its start-stop switching control method. Background technique [0002] Three-purpose heat pump water heater refers to a heat pump water heater that can be used to produce daily hot water, refrigeration and air conditioning, and heating. It generally includes three heat exchangers, namely, a heat exchanger for hot water heating and a heat exchanger for cooling and heating. Heat exchangers and heat exchangers for absorbing and releasing heat from the external environment. Among them, the heat exchanger for hot water heating is a heat exchanger used to heat cold water to a set temperature; the heat exchanger for cooling and heating is used for cooling (absorbing heat from the regulated environment), heating (releasing heat to the regulated environment) heat) heat...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to overcome the complexity of the control pipeline of the three-purpose heat pump water heater in the prior art, many fault points, and the possibility that the refrigerant and lubricant in the equipment may be in an uncontrollable state, thereby providing a simple and easy-to-fault pipeline connection. Three-purpose heat pump water heater with few points, low equipment cost, and controllable refrigerant and lubricant in various operating modes and its start-stop switching control method

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