JPS6215693Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a solar water heater. In other words, unlike the conventional method, which converts hot water in a heat storage tank into hot water at a constant temperature via an auxiliary heat source and supplies hot water to an elevated hot water tap as needed, Since the hot water tap is located in a high place, the hot water pump needs to have a high capacity, but if the capacity is too high, the hot water will blow out from the safety valve provided in the auxiliary heat source, so the hot water pump capacity is required. must be below the operating pressure of the safety valve, and on the other hand, the operating pressure of the pressure switch that controls the drive of the hot water pump is set within the capacity of this hot water pump, so the hot water tap is located at a high place. Since the head pressure and the pressure loss in the piping are large, even if the pressure switch closes due to the drop in the pressure in the piping due to the opening of the hot water tap and drives the hot water pump, the head pressure and the pressure loss in the piping will cause As soon as the pressure inside the piping increases, the pressure switch becomes open and the hot water pump stops even when the hot water tap is opened.Then, when there is no longer a flow of hot water in the piping, the pressure inside the piping drops again and the hot water pump is activated to sequentially supply hot water. The pump is driven and stopped repeatedly, which makes it impossible to supply hot water satisfactorily to hot water taps located at high places, and also causes damage to the hot water pump.

This invention focuses on the above points, and by providing a timer in addition to the pressure switch, which starts timing with the pressure switch and drives the hot water pump for a certain period of time,
It is an object of the present invention to provide a solar hot water supply system which eliminates the above-mentioned drawbacks, allows hot water supply to high places to be carried out smoothly, and prevents damage to the hot water supply pump.

Next, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a solar heat collector installed at a high place for collecting solar heat, which is connected to a heat storage tank 4 via a circulation circuit 3 equipped with a circulation pump 2.

The heat storage tank 4 always stores a certain amount of water via a cistern 5 provided therein, and this water is sequentially passed through the heat collector 1 to store it as high-temperature water.

6 is a hot water supply pipe that connects the heat storage tank 4 and the faucet on the second floor and the high-place hot water tap 7 for showers, etc. There is a pipe in the middle that opens when the pressure inside the pipe exceeds a set value of 0.9Kg/cm ² to supply hot water. It is equipped with an auxiliary heat source 9 such as a small water heater using gas, oil, or electricity as fuel with a safety valve 8 for blowing out air, and a hot water pump 10 with a capacity of 0.9 kg/cm ² to keep the hot water in the heat storage tank 4 at the set temperature. When the hot water does not reach this temperature, the auxiliary heat source 9 is used to heat the hot water and supply hot water as needed.

Reference numeral 11 denotes a pressure switch provided in the hot water supply pipe 6, which opens the high hot water supply tap 7 and lowers the internal pressure of the hot water supply pipe 6 to 0.6.
When the internal pressure of the hot water supply pipe 6 becomes 0.8 kg/cm ² or more, it closes and closes the high water supply tap 7 and controls the energization of the hot water pump 10 by opening when the internal pressure of the hot water supply pipe 6 becomes 0.8 kg/cm ² or more. .

Reference numeral 12 denotes a timer that drives the hot water pump 10 for a certain period of time, here 60 seconds, regardless of the pressure switch 11 when the pressure switch 11 is closed. It drives the pump 10.

13 is a check valve provided in the middle of the hot water supply pipe 6;
This prevents hot water from flowing back from the auxiliary heat source 9 to the heat storage tank 4.

The hot water pump 10 is controlled by connecting in series a parallel circuit of the pressure switch 11 and the normally open timer contact 12a, and a parallel circuit of the hot water pump 10 and relay 14, as shown in the electrical circuit diagram of FIG. Power supply 1
A series circuit of a normally open relay contact 14a and a timer 12 is provided on the secondary side of a voltage drop transformer 16 connected to the power source 15, and the hot water pump 10 is connected to the pressure switch 11 and the timer 12. It's like controlling it.

Next, to explain the operation of this embodiment of the invention, if the circulation pump 2 is now driven and the water in the heat storage tank 4 is sequentially distributed to the heat collector 1 via the circulation circuit 3, the water will be heated by solar heat. The heated water is stored in the heat storage tank 4 as hot water. Then, in this state, adjust the high-place hot water tap 7 as appropriate.
When the hot water supply pipe 6 is opened, the pressure inside the hot water supply pipe 6 decreases, and when it reaches the ON operating pressure of the pressure switch 11, the pressure switch 11 is closed and the hot water supply pump 10 is driven, and the hot water temperature in the heat storage tank 4 is set at the set temperature. If the temperature is lower than the set temperature, it can be forcibly heated to the set temperature by the auxiliary heat source 9 to always supply hot water at a constant temperature from the hot water tap 7. 7 is located at a high place, the internal pressure of the hot water supply pipe 6 rises due to the lift pressure and the pressure loss inside the pipe, and reaches the OFF operating pressure of the pressure switch 11, which opens the pressure switch 11 and opens the hot water tap 7 to supply hot water. Although the drive of the hot water pump 10 is about to be stopped despite the request, in this invention, the relay 14 is energized at the same time as the pressure switch 11 is closed, and the relay contact 1 connected in series with the timer 12 is energized.
4a is closed to energize the timer 12, the timer contact 12a is closed, and the timer 12 controls the energization of the hot water pump 10 and the relay 14. If the hot water tap 7 is still open and the pressure switch 11 is closed after this certain period of time has elapsed, the timer 12 is activated again.
is to drive the hot water pump 10 for a certain period of time, and even if the pressure switch 11 is in the open state, this opening is due to the head pressure and the pressure loss in the piping, so the hot water pump 10 will be temporarily stopped and the hot water will flow. As soon as the pressure is removed, the pressure will drop and the pressure switch 11 will be closed again in a few seconds, so that the timer 12 will immediately start energizing again.

Therefore, the hot water supply pump 10 is controlled by the pressure switch 11 and the timer and continues to be driven by the opening of the hot water tap 7. Therefore, the conventional pressure switch 11 malfunctions due to head pressure and pressure loss in the piping, causing the hot water supply pump 10 to be driven and driven. By adding the auxiliary heat source 9, which was previously impossible due to repeated stops, hot water can be supplied to high places smoothly and reliably, making it extremely easy to use.Furthermore, the hot water pump 10 repeatedly starts and stops. The hot water pump 10 always operates properly and can withstand long-term use without being damaged.

Even if the timer 12 closes the hot water tap 7 while the hot water pump 10 is in operation, the pressure in the piping up to the hot water tap 7 is the capacity of the hot water pump 10.
It does not exceed 0.9Kg/cm ² and remains constant at this 0.9Kg/cm ² , and after this constant, the hot water pump 1
0 only allows hot water to flow through a small space between the discharge port and the pump blade, does not affect anything else, does not slip or run dry, and is only for a short time of 60 seconds at most, so the hot water pump There is no need to worry about damage to the piping components including the hot water supply pump 10, and if for some reason the inside of the piping becomes abnormally high in pressure beyond the capacity of the hot water pump 10, the safety valve 8 will operate and the water will be pumped to 0.9 kg/kg.
Since it releases pressure exceeding cm ² , the inside of the piping is always safe and can be used with peace of mind.

As described above, this invention has a safety valve 8 installed in the heat storage tank 4 that stores solar heat collected by the heat collector 1 as hot water.
In a system in which a hot water supply pipe 6 consisting of an auxiliary heat source 9 and a hot water supply pump 10 are connected to supply hot water at an appropriate constant temperature from an elevated hot water supply faucet 7, the hot water supply pump 10 is controlled by the internal pressure of the hot water supply pipe 6. This is because it is controlled by a pressure switch 11 that opens and closes depending on the pressure switch 11 and a timer 12 that starts timing at the same time as the pressure switch 11 starts driving the hot water pump 10 and drives the hot water pump 10 for a certain period of time regardless of the pressure switch 11. In addition to the pressure switch, the hot water pump continues to be driven for a certain period of time regardless of the pressure switch due to the timer that is started by the pressure switch. This prevents the hot water supply pump from repeatedly opening and closing due to pressure and piping pressure loss, causing the hot water pump to frequently start and stop, resulting in insufficient hot water supply or damage to the hot water pump. The water supply pump is always operated reliably by a timer to provide smooth and good hot water supply, and is extremely easy to use.The hot water supply pump does not have to be driven or stopped many times and can withstand long-term use without failure.

[Brief explanation of the drawing]

Fig. 1 is a piping diagram of a solar water heater showing an embodiment of this invention, and Fig. 2 is an electrical circuit diagram of the same. 1... Heat collector, 4... Heat storage tank, 6... Hot water supply piping, 7... High place hot water tap, 8... Safety valve, 9... Auxiliary heat source, 10... Hot water supply pump, 11... Pressure switch, 12...Timer.

Claims (1)

[Scope of utility model registration request] A hot water supply pipe 6 consisting of an auxiliary heat source 9 equipped with a safety valve 8 and a hot water pump 10 is connected to a heat storage tank 4 that stores solar heat collected by a heat collector 1 as hot water, and hot water at a constant temperature is appropriately supplied to an elevated hot water tap. 7, a pressure switch 11 opens and closes the hot water pump 10 according to the internal pressure of the hot water supply piping 6, and the pressure switch 11 starts driving the hot water pump 10 at the same time as timing starts to run the hot water pump 10 for a certain period of time. A solar water heater characterized in that it is controlled by a timer 12 that is driven for a fixed period of time regardless of a pressure switch 11.