JPS6143625B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a solar heat collector, a heat storage tank connected to the solar heat collector through an outgoing pipe and a return pipe, a heat collecting pump provided on the outgoing pipe, and The present invention relates to a solar hot water supply system including a hot water supply pipe located on the discharge side of a heat collecting pump and branched from the outgoing pipe.

In a conventional solar water heater of this kind, the heat collection pump has the function of a hot water pressurizing pump for pressure feeding hot water, so the heat collection pump needs to be large, and as a result, This large pump is operated even during solar heat collection, which poses a problem in terms of high running costs.

The present invention has been made to solve the above-mentioned conventional problems, and one embodiment of the present invention will be described below with reference to the drawings. In Figure 1, 1 is a solar heat collector, 2 is an outgoing pipe 3 and a return pipe 4 to the solar heat collector 1.
A heat storage tank 5 is connected to the outgoing pipe 3 via a pipe.
A heat collecting pump 6 is located on the discharge side of the heat collecting pump 5 and is a hot water supply pipe branched from the outgoing pipe 3,
A hot water faucet 7 is provided at the tip of the hot water supply pipe 6. A water supply pipe 8 is connected to the upper part of the heat storage tank 2, and a ball tap 9 is connected to the water supply pipe 8. Reference numeral 10 denotes a partition wall disposed within the heat storage tank 2 to prevent mixing of hot water and water.

11 is a hot water pump installed in the hot water pipe 6;
2 and 13 are thermistors constituting a differential temperature thermostat for controlling the operation of the heat collecting pump 5, and this thermistor 1
2 and 13 are attached to the solar heat collector 1 and the heat storage tank 2, respectively. Reference numeral 14 denotes a pressure switch provided in the hot water supply pipe 6, and this pressure switch 14 is configured to control the heat collection pump 5 and the hot water supply pump 11 simultaneously.

FIG. 2 shows the control circuit for the heat collection pump 5 and the hot water pump 11, where 15 is an AC power supply, 16 is a temperature difference thermometer, and this temperature difference thermometer 16 detects the thermistor 12 on the solar heat collector 1 side. It turns on when the difference in temperature between the temperature and the temperature detected by the thermistor 13 on the heat storage tank 2 side exceeds a predetermined value, and turns off when it falls below a predetermined value. 17 is a relay coil connected in series with the temperature difference thermostat 16;
The contact 18 is connected in series with the heat collecting pump 5. 19 is a relay coil connected in series with the pressure switch 14, and this relay coil 19 has a first contact 20 connected in series with the hot water pump 11.
and a second contact 21, and the second contact 2
1 is a contact point 18 between the heat collecting pump 5 and the relay coil 17
It is connected to the midpoint of

The operation in the above configuration will be explained. During solar heat collection operation, the thermistors 12 and 13 detect the water temperature in the solar heat collector 1 and the water temperature in the heat storage tank 2, respectively, and the temperature detected by the thermistor 12 is higher than the temperature detected by the thermistor 13 by a predetermined value or more. Then, the temperature difference thermostat 16 is turned on and the relay coil 17 is energized. This energization closes the contacts 18 of the relay coil 17, so that the heat collection pump 5 starts operating. By operating this heat collection pump 5, the heat storage tank 2
The water inside is sent from the outgoing pipe 3 to the solar heat collector 1, and the hot water heated by the solar heat collector 1 is sequentially stored from above inside the heat storage tank 2 via the return pipe 4.

When hot water is supplied, the hot water supply faucet 7 provided at the tip of the hot water supply pipe 6 is opened to supply hot water. is detected and turned on, energizing the relay coil 19. This energization closes the first contact 20 and the second contact 21 of the relay coil 19, so the first contact 20
The hot water pump 11 connected in series to the second contact point 21 starts operating, and the heat collection pump 5 connected in series to the second contact point 21 starts operating. Therefore, during this hot water supply, the heat collection pump 5 and the hot water supply pump 11
Since the heat collecting pump 5 and the hot water supply pump 11 are small-sized and low power consumption type pumps, it is possible to sufficiently obtain a predetermined hot water supply pressure.

As described above, according to the present invention, the hot water supply pump is provided in the hot water supply pipe that is located on the discharge side of the heat collection pump and is branched from the outgoing pipe, and when solar heat is collected, the temperature difference between the solar heat collector and the heat storage tank is The thermostat controls the start and stop of the heat collection pump, and when hot water is being supplied, both the heat collection pump and the hot water supply pump are simultaneously controlled by a pressure switch installed in the hot water pipe. Even if a hot water pump is small and has low power consumption, it is possible to obtain sufficient hot water pressure.As a result, running costs can be significantly reduced by downsizing the heat collection pump and hot water pump. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of a solar water heater showing an embodiment of the present invention, and FIG. 2 is a control circuit diagram of a heat collection pump and a hot water supply pump in the same water heater. 1... Solar heat collector, 2... Heat storage tank, 3... Outgoing pipe, 4... Return pipe, 5... Heat collection pump, 6... Hot water supply pipe, 11... Hot water supply pump, 14... Pressure switch , 16... Differential temperature thermometer.

Claims (1)

[Claims] 1 A solar heat collector and an outgoing pipe to this solar heat collector,
The hot water supply system includes a heat storage tank connected via a return pipe, a heat collection pump provided on the outflow pipe, and a hot water supply pipe located on the discharge side of the heat collection pump and branched from the outflow pipe. A hot water pump is installed in the pipe, and when collecting solar heat, the temperature difference between the solar heat collector and the heat storage tank is used to control the start and stop of the heat collecting pump, and when hot water is being supplied, both the heat collecting pump and the hot water pump are turned on and off. A solar hot water heater that simultaneously controls shutoff and shutoff using a pressure switch installed in the hot water pipe.