JPS58158448A - Heat-pump hot water supply device - Google Patents

Abstract

PURPOSE:To prevent heat from being dissipated from a hot water storing tank due to natural convection, by a method wherein a solenoid valve provided in a water circuit is opened when passing an electric current to a compressor for a refrigerating cycle and a pump provided in the water circuit, in the titled hot water supply device wherein a tank and a heat pump are integral with each other. CONSTITUTION:When a switch 21 is closed, te compressor 10 and the pump 17 are operated, and the solenoid valve 14 is opened. As a result, the refrigerating cycle is formed in which a refrigerant discharged from the compressor 10 is passed through a refrigerant passage in a water heater 11, is passed sequentially through a decompressor 12 and a heat absorber 13, and is sucked into the compressor 10 again. On the other hand, in a water circuit, water pumped up from the tank 16 by the pump 17 is passed through a water passage in the water heater 11, and is returned into the tank 16 by passing through a valve 14. When water in the tank 16 is heated to a sufficiently high temperature, the switch 21 is opened to stop the supply of the electric current to the compressor 10 and the pump 17, and the valve 14 is closed. Since the valve 14 is closed in this heat-insulating stage, the heat in the tank 16 is prevented from being dissipated due to natural convection.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump water heater, and its purpose is to prevent heat loss from a hot water storage tank due to natural convection.

An example of a conventional heat pump water heater in which a tank and a heat pump are integrated will be explained with reference to FIG.

In the figure, 1 is a compressor, and a refrigerant passage (not shown) of a water heater 2, a pressure reducer 3, and a heat absorber 4 are sequentially connected in an annular manner through a refrigerant pipe to form a refrigeration cycle.

On the other hand, a water passage (not shown) of the water heater 2 is connected in an annular manner to a tank 7 surrounded by a pump 5 and a heat insulating material 6 at the front and rear through water piping.

Further, the tank is connected to a water supply source via a water supply pulp 8 and to a drainage source via a drainage pulp 9.

In the configuration described below, the operation of the conventional heat pump water heater will be described next.

In the refrigeration cycle, the refrigerant discharged from the compressor 1 passes through the refrigerant passage of the water heater 2, then sequentially passes through the pressure reducer 3 and the heat absorber 4, and is sucked into the compressor 1 again. is forming. On the other hand, in the water circuit, water pumped up from the tank 7 by the pump 6 is supplied to the water heater 2.
After passing through the water circuit, it returns to tank 7 again. In the water heater 2, heat is transferred from the high temperature refrigerant passing through the refrigerant passage in the water heater 2 to the water passing through the water passage in the water heater 2. The temperature of the water inside increases over time.

When using the hot water stored in the tank 7, the water supply pulp 8 and the drain valve 9 may be opened, and the hot water is discharged from the drain valve 9 by water pressure from the water supply source.

However, when the high temperature water stored in the tank 7 is not used, the heat in the tank Y moves upward due to natural convection and escapes from the piping between the tank 7 and the drain valve 9.

Therefore, the present invention eliminates the above-mentioned drawbacks of conventional heat pump water heaters and prevents heat from escaping in the tank due to natural convection.

Next, an embodiment of the present invention will be described with reference to FIG.

In the figure, 1o is a compressor, and a refrigerant passage of a water heater 11, a pressure reducer 12, and a heat absorber 13 are sequentially connected in an annular manner by a refrigerant pipe to form a refrigeration cycle.

On the other hand, in the water passage of the water heater 11, an electromagnetic on-off valve and a pump 17 are connected in an annular manner by water piping to form a water circuit. Further, the water tank 16 is connected to a water supply source via a water supply pulp 18, and is connected to a drainage source via a drain valve 19.

Next, the operation of the control device for the heat pump water heater according to the present invention will be explained with reference to FIG. 3.

In the figure, 20 is a power source, and the electromagnetic on-off valve 14, the compressor 1o, and the pump 17 are connected in parallel through a switch 21 by an air-chondrium wiring.

Next, regarding the operation of the above configuration, see Figures 2 and 3.
The explanation will be given with reference to the figures.

When switch 21 is closed, compressor 10 and pump 17
is energized and operates, and the electromagnetic on-off valve 14 opens. For this reason, in the refrigeration cycle, the refrigerant discharged from the compressor 10 passes through the refrigerant passage of the water heater 11 and then passes through the pressure reducer 1
2. A refrigeration cycle is formed in which the water passes through the heat absorber 13 and is sucked into the compressor 10 again. On the other hand, in the water circuit, water pumped up from the tank 16 by the pump 17 passes through the water passage of the water heater 11, passes through the electromagnetic on-off valve 14, and returns to the tank 16 again. In the water heater 11 , heat is transferred from the high temperature refrigerant passing through the refrigerant passage of the water heater 11 to the water passing through the water passage of the water heater 11 . The temperature of water increases over time.

When using the hot water stored in the tank 16, it is sufficient to open the water supply pulp 18 and the drain valve 19, and the hot water is discharged from the drain valve 19 by water pressure from the water supply source.

When the hot water in the tank 16 reaches a sufficiently high temperature and the switch 21 is opened, the compressor 10 and the pop-up 17 are energized correctly.
The electromagnetic on-off valve 14 will be closed.

While the hot water is being kept warm in the tank 16, the heat insulating material 15 prevents heat from escaping from the tank 16 to the outside by heat conduction, and since the electromagnetic on-off valve 14 is closed, the water in the tank 16 is kept warm by natural convection. Heat does not move upward and escape from the piping between tank 16 and drain valve 19.

As is clear from the second explanation, the heat pot water heater of the present invention comprises a refrigeration cycle consisting of a compressor, a refrigerant passage of a water heater, a pressure reducer, and a heat absorber, a water passage of a water heater, and an electromagnetic cycle. It consists of a shut-off valve, a tank, and a pump that are connected in a circular manner through water piping, and when the compressor and the pump 11 are energized, the electromagnetic shut-off valve is opened, and the compressor and the pump are de-energized. A control device for closing the electromagnetic on-off valve is provided inside.

According to the Toito pump water heater of this invention,
This eliminates the drawback of conventional heat pot water heaters where heat escapes due to natural convection while high-temperature water is stored in the tank, and has the excellent effect of virtually eliminating heat loss from the tank. .

[Brief explanation of the drawings] Figure 1 is a schematic configuration diagram of a conventional heat pump water heater;
The figure is a schematic configuration diagram of a heat pump water heater according to an embodiment of the present invention, and FIG. 3 is an electric circuit diagram showing a control device of the heat pump water heater. 1o...Compressor, 11...Water heater,
12... Pressure reducer, 13... Heat absorber, 1
4... Solenoid on-off valve, 16... Tank,
17...Pump. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Figure 12 Figure 3? f!

Claims (1)

[Claims] A refrigeration cycle in which a compressor, a refrigerant passage of a water heater, a pressure reducer, and a heat absorber are connected in a ring, and a water circuit in which a water passage of the water heater, an electromagnetic on-off valve, a tank, and a pump are connected in a ring through water piping. A heat pump water heater comprising a control device that opens the electromagnetic on-off valve when the compressor and the pump are energized, and closes the electromagnetic on-off valve when the compressor and the pump are not energized.