JPS637292B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a heat pump water heater that is equipped with a compressor, a heating condenser for heating water, an expansion mechanism, an evaporator, etc. The purpose of the present invention is to provide a heat pump water heater for supplying hot water using the internal pressure of water pipes by enabling direct connection to pipes.

Conventionally, in heat pump water heaters, water supply is controlled using ball taps such as cisterns.
Only the amount of hot water used is supplied, and hot water is supplied to the hot water inlet using a pump. This heats the water by installing a condenser for heating water in the refrigeration cycle installed in the hot water storage tank, but if an accident occurs such as the refrigerant or oil flowing inside the condenser leaking, the hot water will not be supplied as it is. On the other hand, when connected directly to water pipes, refrigerant or oil flows back into the water pipes, making it necessary to use a ball tap water supply system.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

In the figure, 1 is a closed hot water storage tank covered with heat insulating material 2, 3 is a compressor, 4 is a four-way valve for switching the refrigerant path only during defrosting, and 5 is housed in the hot water storage tank 1 and is used for water heating. , 6 is an expansion valve, 7 is an evaporator, 8 is a blower for heat exchange of the evaporator 7, 9 is an accumulator, 10 is installed above the hot water storage tank 2, and water is sent to the kitchen, bathtub, etc. A water supply outlet 11 is provided near the water supply inlet 11 which is directly connected to the water pipe, and 12 is provided near the water supply inlet 11. If refrigerant leaks from the condenser 5 or the like, a differential pressure switch 13 consisting of a diaphragm The differential pressure switch 13 senses the difference in pressure between the pressure guide pipe 14 in the hot water storage tank 1 and the connecting pipe 15, and when a predetermined pressure difference is reached, the first solenoid valve is closed. 1
2 is closed, and the second solenoid valve 1 provided in the drain pipe 16
Let's open 7. 18 is a drain port, 19 is a water supply pipe 20
and the water supply primary pressure pipe 21, and is supplied from the water supply inlet 11 through the first solenoid valve 12, and from the water supply primary pressure pipe 21 to the water supply pipe 20 to the hot water storage tank 1 to reduce the water pressure to a constant level. It is a pressure reducing valve for

In the above configuration, by operating the compressor 3, the refrigerant flows through the four-way valve 4 to the condenser 5, where the water in the hot water storage tank 11 is heated by the heat of condensation. The condensed refrigerant is depressurized by the expansion valve 6,
It is evaporated in the evaporator 7 and returned to the compressor 3 via the four-way valve 4. On the other hand, the heated hot water is supplied from the water supply outlet 10 as needed, but the amount of hot water supplied is determined by the pressure inside the water pipe from the water supply inlet 11, and the first solenoid valve 12, which is always open, is depressurized. Water is supplied into the hot water storage tank through the valve 19. However, if for some reason a hole occurs in the refrigerant piping in the hot water storage tank 1 such as the condenser 5, and a refrigerant leakage accident occurs,
The pressure inside the closed hot water storage tank 1 increases due to leakage of high temperature and high pressure refrigerant. Therefore, the increased pressure is applied to the differential pressure switch 13 through the pressure guide pipe 14, while the water primary pressure is applied from the water primary pressure pipe 21 to the differential pressure switch 13 through the connecting pipe 15, and the differential pressure switch 13 detects the decrease in the differential pressure and closes the first electromagnetic valve 12, which is connected to the first electromagnetic valve 12, to prevent the refrigerant, circulating oil, etc. from flowing back into the water supply inlet 11 directly connected to the water supply. Also, the first solenoid valve 1
2 is closed, the second solenoid valve 17 is opened, and the water in the hot water storage tank 1 is drained. Since water is drained at the time of each leak, it is possible to prevent water from entering the refrigerant piping.

According to the present invention, a first electromagnetic valve that closes when the pressure in the water pipe and the pressure in the hot water storage tank decreases, the primary water pressure Since it has a differential pressure switch that senses the differential pressure in the tank and a second solenoid valve for draining that opens when the differential pressure switch operates, it is possible to connect directly to the water supply. There is no need for cisterns or hot water pumps, equipment costs are significantly reduced, and water can be prevented from entering the refrigerant piping.
This has practical effects, such as making later maintenance easier and making it possible to protect the sealed hot water storage tank itself.

[Brief explanation of the drawing]

The figure is a schematic diagram of the configuration of a heat pump water heater according to the present invention. DESCRIPTION OF SYMBOLS 1... Hot water storage tank, 5... Condenser, 11... Water supply inlet, 12... First solenoid valve, 13... Differential pressure switch, 14... Pressure guide pipe, 15... Connection pipe, 1
6... Drain pipe, 17... Second solenoid valve, 19... Pressure reducing valve, 20... Water supply pipe.

Claims (1)

[Claims] 1. The condenser of the refrigeration cycle is provided in a closed hot water storage tank, and a first solenoid valve that is always open is provided on the water supply inlet side to the hot water storage tank, and a pressure reducing valve is provided in the middle of the water supply pipe to the hot water storage tank. , a connecting pipe provided between the first electromagnetic valve and the pressure reducing valve to derive the primary water pressure, a pressure guide pipe to derive the internal pressure of the hot water storage tank, and a drain pipe to drain the water in the hot water storage tank. a second solenoid valve provided, a pressure within the hot water storage tank,
1. A heat pump water heater comprising: a differential pressure switch that detects a differential pressure with a primary water pressure; the differential pressure switch controls a first electromagnetic valve and a second electromagnetic valve.