JPS6140893B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a solar heat collector,
We aim to provide a solar heat collection device in which the heat collection piping between the heat storage tank and the heat collector is configured with a single pipe, reducing the number of heat collection pipes, simplifying construction, reducing costs, and saving energy. purpose.

Conventional solar heat collectors have configurations as shown in FIGS. 2 and 3. Figure 2 shows a forced circulation type solar heat collector.
The water in the heat storage tank 3 is supplied by the circulation pump 2 to the heat storage tank 3 through the heat collection feed pipe 4, and the hot water whose temperature has been raised in the heat collector 1 is returned to the heat storage tank 3 through the heat collection return pipe 5. It's starting to come back. A water tank 6 is placed on top of the heat storage tank 3, and a ball tap 7 is used to supply and stop tap water. Hot water is supplied under pressure. 10 is a water supply pipe that supplies water from the water tank 6 to the heat storage tank 3, and 11 is an air vent valve attached to the heat collector.

This thing moves from the heat storage tank 3 to the circulation pump 2 during operation.
Water is sucked in, passes through the heat collecting and sending pipe 4, the heat collector 1, the heat collecting return pipe 5, and returns to the heat storage tank 3 for circulation.

The disadvantage of this conventional method is that it requires two pipes, a heat collection feed pipe 4 and a heat collection return pipe 5, from the heat storage tank 3 to the heat collector 1, which increases the cost of piping and makes the construction difficult. It was hot.

In addition, heat loss occurs in both the heat collecting and sending pipe 4 and the heat collecting and returning pipe 5, and the circulating pump 2 is constantly rotating, which is contrary to energy saving.

Figure 3 shows a conventional pump-type solar heat collector. Water is supplied to the heat collector 12 from the cistern 13 by opening the water pipe 15 from the ball tap 14 in the cistern 13. The heat collection pipe 16 connects the heat collector 12 to the heat storage tank 1.
7, and a timer valve 18 is provided in the middle of the heat collection pipe 16. Hot water is supplied from the heat storage tank 17 to a faucet 20 by a hot water supply pressure pump 19. The water pipe 15 is provided with a water stop valve 21 and a drain valve 22.

When attempting to collect heat in this device, the stop valve 21 is opened, water is supplied to the heat collector 12, and the timer valve 18 is set in the direction to close the heat collection pipe 16. After a predetermined period of time has elapsed, the timer valve 18 opens, so the hot water heated in the heat collector 12 flows through the heat collection pipe 16 to the heat storage tank 1.
Fall into the water in 7. Thereafter, water supply and water discharge are repeated at predetermined intervals.

The disadvantage of this conventional method is that two pipes, a water pipe 15 and a heat collection pipe 16, are required to reach the heat collector 12, which increases the cost of the pipes and makes the construction difficult. In addition, in the case of this method, the heat storage tank 17
Since the water falls unilaterally from the heat collector 12, if the hot water supply is not used the previous day, no matter how sunny the day is, the hot water remaining in the heat storage tank 17 from the previous day cannot be further heated. The only options available were to use the hot water left over from the previous day, or to throw away the hot water from the previous day and collect the heat. For this reason, it is not possible to effectively collect solar heat or raise the temperature.
It was against energy conservation.

As described above, all conventional solar heat collectors require two pipes to connect to the heat collector, which makes piping work difficult and expensive, and is also contrary to energy conservation.

The present invention solves the above-mentioned conventional drawbacks by configuring the heat collection piping from the heat storage tank to the heat collector with a single pipe, and supplying water from the heat storage tank via the heat collection pipe with a heat collection pump. However, this problem was solved by returning the hot water from the heat collector to the heat storage tank via the heat collection pipe after the water temperature has risen. An embodiment of the present invention will be described below with reference to FIG.

In the figure, 31 is a heat collector that collects solar heat, and 32 is a heat storage tank that stores hot water heated by the heat collector 31. The heat collector 31 and the heat storage tank 3
2 are connected by one heat collection pipe 33.
A heat collection pump 34 is provided near the heat storage tank 32 of the heat collection pipe 33 and plays the role of supplying water from the heat storage tank 32 to the heat collector 31. On the discharge side of the heat collecting pump 34, there is an electric two-way valve 3 which is an on-off valve.
5 is provided, and the heat collection pipe on the suction side of the heat collection pump 34 is branched into two, a first heat collection pipe 36 connected to the upper part of the heat storage tank 32 and a first heat collection pipe 36 connected to the lower part of the heat storage tank 32. The second heat collecting pipe 37 is provided with a second heat collecting pipe 37. A first check valve 38 is installed in the first heat collection pipe 36 from the heat collector 31 side toward the heat storage tank 32, and a second check valve 38 is installed in the second heat collection pipe 37 from the heat collector 31 side toward the heat storage tank 32.
9 is attached from the heat storage tank 32 side toward the heat collector 31, and water is supplied to the heat collector 31 from the heat storage tank 3.
2 and from the heat collector 31 to the upper part of the heat storage tank 32. The heat collector 31 is provided with an air vent valve 40 as an air vent means, and air enters and exits through the air vent valve 40 when water is supplied to the heat collector 31 and when water falls into the heat storage tank 32 after being heated. do.
In addition, the heat collector 31 is provided with a high temperature side sensor 42 of a temperature difference thermometer 41, which works with the low temperature side sensor 43 provided with the heat storage tank 32 to
4 is controlled. Hot water is supplied from the heat storage tank 32 to the faucet 44 by a hot water supply pressure pump 45. When the faucet 44 is opened, the pressure stored between the hot water supply pressure pump 45 and the check valve 46, which is about to stop, decreases, so the pressure switch 47 detects this and starts the operation of the hot water supply pressure pump 45. . When the faucet 44 is closed, the discharge pressure of the hot water supply pressure pump 45 increases, so the pressure switch 47 is activated and the operation of the hot water supply pressure pump 45 is stopped. Water is supplied to the heat storage tank 32 from a water pipe 48 via a ball tap 49. 50 is a separation pipe for preventing cold water from the tap from mixing with hot water in the heat storage tank 32. Reference numeral 51 denotes a flow rate switch, which is provided at the lower part of the heat collecting pipe 33. This flow rate switch 51 is a one-way type and is activated when water flows in the direction of the heat collector 31. 52 is an expansion tank.

Next, the operation of this embodiment will be explained. When the sun rises, the heat collector 31 is heated by solar radiation, and the high temperature side sensor 42 and low temperature side sensor 43 of the differential temperature thermometer 41 are activated.
When the difference between the two directions opens and reaches a predetermined set value, the electric two-way valve 35 opens and the heat collection pump 34 starts operating.
The water in the heat storage tank 32 passes through the second heat collection pipe 37 and the second check valve 39, is pressurized by the heat collection pump 34, and is supplied to the heat collector 31 via the heat collection pipe 33. Ru. At this time, the heat collector 31 and the heat collection pipe 33
The air contained inside is pushed out and discharged from an air vent valve 40 provided with a heat collector 31. When the heat collector 31 is filled with water and the water supply ends, the flow of water stops, so the flow rate switch 51 is turned off, the electric two-way valve 35 is closed, the heat collection pipe 33 is closed, and the water from the heat collector 31 is stopped. After that, the heat collecting pump 34 is turned off. When the difference between the hot water temperature in the heat collector 31 and the water temperature in the heat storage tank 32 increases and reaches a predetermined value, the temperature difference thermometer 41 is activated by the functions of the high temperature side sensor 42 and the low temperature side sensor 43, and the electric two-way valve 35 is opened. do. For this reason, the heated water in the heat collector 31 falls into the heat storage tank 32 via the heat collection pipe 33 in the same way as when it is supplied. At this time, the second heat collection pipe 37 side provided near the heat storage tank 32 is connected to the check valve 3.
Since backflow is prevented by the action of 9, the heat collector 3
The hot water falling from the heat storage tank 32 is returned to the upper part of the heat storage tank 32 through the first heat collection pipe 36 side. Thereafter, the supply of water to the heat collector 31 and the dropping of the heated hot water are repeated in the same manner. Hot water in the heat storage tank 32 is supplied from the upper part of the heat storage tank 32 by a hot water supply pressure pump 45 in response to opening of the faucet 44 .

Since this embodiment has an air vent valve 40 as an air venting means on the upper part of the heat collector 31, when water is supplied from the heat storage tank 32 to the heat collector 31, the heat collector 31
This air vent valve 4 allows the air in the heat collection pipe 33 to escape quickly, and when water falls after the temperature rises, the air vent valve 4
Air enters from 0, making it easy to fall into the water. Since the heated water that has fallen into the heat storage tank 32 is configured to be stored from the upper part of the heat storage tank 32, it is difficult to mix with the cold water in the heat storage tank 32, and high-temperature hot water can be supplied.

Moreover, since the heat collecting pump 34 is stopped when the water supply to the heat collector 31 is finished, the power cost of the heat collecting pump 34 can be reduced. Furthermore, heat collection pump 3
When the water supply to the heat collector 31 of No. 4 is stopped, the heat collection pipe 3
3 is closed by the on-off valve 35, so the heat collector 31
This embodiment has the effect of preventing water from dripping.

The present invention provides one heat collection piping from the heat storage tank to the heat collector.
It is composed of two pipes, and this one heat collection pipe alternately supplies water to the heat collector and drains it, so it has the following effects.

(1) Only one heat collection pipe is required from the heat storage tank to the heat collector, and no special water supply pipe is required, simplifying construction and reducing costs.

(2) Since there is only one heat collection pipe, heat loss from the heat collection pipe can be halved, resulting in energy savings.

(3) The water in the heat storage tank is supplied to the heat collector and returned to the heat storage tank after being heated, so even if there is leftover water from the previous day, the temperature of the water in the heat storage tank can be increased.

As described above, the present invention has great effects.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a solar heat collector according to an embodiment of the present invention, Fig. 2 is a system diagram of a conventional solar heat collector, and Fig. 3 is a system diagram of another conventional solar heat collector. It is. 31... Heat collector, 32... Heat storage tank, 33... Heat collection piping, 34... Heat collection pump, 35... Electric two-way valve (on/off valve), 38, 39... Check valve (route switching means), 40... air vent valve (air vent means).

Claims (1)

[Claims] 1. A heat collector that collects solar heat, a heat storage tank that stores hot water heated by the heat collector, and one heat collection pipe leading from the heat storage tank to the heat collector. Consisting of tubes,
A solar heat collection system that uses a heat collection pump to supply water from the heat storage tank via the heat collection piping, and after the water has been heated, the hot water from the heat collector is returned to the heat storage tank via the heat collection pipe. Device. 2. The solar heat collecting device according to claim 1, wherein the heat collector has an air venting means. 3. The heat collection piping on the suction side of the heat collection pump branches into two, one connected to the top of the heat storage tank and the other to the bottom of the heat storage tank. When supplying water to the heat collector, water is connected from the bottom of the heat storage tank. 2. The solar heat collecting device according to claim 1, further comprising a switching means for returning hot water to the upper part of the heat storage tank when returning hot water from the heat collector. 4. The solar heat collection device according to claim 1, wherein the heat collection pump stops operating when water supply to the heat collector ends. 5. Solar heat according to claim 4, characterized in that when the water supply operation of the heat collection pump to the heat collector is stopped, the heat collection piping is blocked by an on-off valve to prevent water from dripping from the heat collector. Heat collection device.