JPS627974Y2 - - Google Patents

Description

[Detailed description of the invention] This invention connects the heat collector and the heat storage tank with an outgoing pipe and a return pipe in which a heat collecting pump is installed to form a circulation circuit for the heat transfer liquid. By circulating the transfer liquid, the solar heat collected by the heat collector is transferred to the heat storage tank and stored there. At the same time, a drain pipe with a drain valve is connected to the lower part of the circulation circuit, and the heat transfer liquid is A solar heat collector that drains liquid from the circulation circuit by opening the drain valve when there is a risk of freezing of the heat transfer liquid, thereby preventing the collector, outgoing pipes, and return pipes from bursting due to freezing of the heat transfer liquid. It is related to.

Conventional solar heat collectors of this type
As disclosed in Publication No. 12186, while the heat phase-shifting liquid circulates in the circulation circuit every day to collect heat, the drain valve inside the drain pipe is opened during the winter. This is also limited to very cold days, so the residence time of the heat phase-shifting liquid is long and it becomes a dead water state.
For this reason, the drain pipe may corrode and cause liquid leakage, or
There was a risk that dirt would adhere to the drain valve, making it unable to perform its anti-freezing function.

In addition, in the solar heat collecting device disclosed in Japanese Utility Model Application Publication No. 50-122347, the heat receiver is provided with an air suction section and a drain pipe each equipped with a valve device operated by a timer, so that the heat receiver can be used in winter, etc. Prevents freezing damage. With this type, a valve device operates periodically (for example, at sunset) to drain water from the heat receiver to prevent freezing, so in cold, bad weather, the water in the heat receiver freezes before the timer operates. Not only was there a risk, but there was also the problem that a large amount of water was discharged even when there was no danger of freezing.

The present invention has been developed in view of the above-mentioned facts, and it is possible to prevent the heat transfer liquid from remaining in the drain pipe for a long period of time without discharging a large amount of the heat transfer liquid in the circulation circuit. It is an object of the present invention to provide a solar heat collecting device that has a long life by preventing corrosion of the drain valve and clogging of the drain valve, and reliably preventing freezing.

The present invention consists of a freeze detector for protecting the circulation circuit that detects the temperature of the heat transfer fluid in the circulation circuit or the freezing danger temperature such as outside air temperature and generates an output, and a drain pipe and drain that periodically generates a short timer output. The basic configuration is to provide a timer device to protect the liquid valve, and give an opening command to the drain valve using the output of either the freeze detector or the timer device, and to periodically close the drain valve using the output of the timer device. In addition to opening the drain valve for a short period of time to prevent liquid from pooling in the drain pipe for a long period of time, in severe cold when the freeze detector detects a dangerous freezing temperature, the drain valve is opened by the output of the freeze detector and the circulation circuit is closed. The system is designed to drain the liquid and prevent the heat collector, outgoing pipe, and return pipe from bursting due to freezing of the heat transfer liquid, and the drain pipe can be drained without draining a large amount of the heat transfer liquid in the circulation circuit. This prevents corrosion and clogging, and allows heat collection operation and anti-freezing to be carried out without any problems, thereby extending the life of the device.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In Fig. 1, 1 is a heat collector, 2 is a heat storage tank, 3 is an outgoing pipe that connects the lower part of the heat storage tank 2 and the inlet of the heat collector 1, and a heat collection pump is installed near the heat storage tank 2. 4 and a water stop valve 5 are provided in this order. 6 is a return pipe that connects the outlet of the heat collector 1 and the middle part of the heat storage tank 2. An air vent valve 7 and an air supply valve 8 are connected to the highest part of the return pipe 6 in the device, and the heat storage A water stop valve 9 is provided near the tank 2 . In this way, the heat collector 1 and the heat storage tank 2 are connected by the outgoing pipe 3 and the return pipe 6 to form a circulation circuit 10 of water as a heat transfer liquid. The outgoing pipe 3 is provided with a lowermost part 3a, which is the lowest part of the circulation circuit 10, to which a drain pipe 12 with a drain valve 11 interposed is connected. Also, slightly above the water stop valve 9 of the return pipe 6 and the lowest part 3a of the outgoing pipe 3.
A water supply pipe 15 is connected to the vicinity by a communication pipe 14 having a check valve 13 interposed therein, and is connected to the lower part of the heat storage tank 2 .

A control device 16 includes a solar radiation sensor 17 that detects the amount of solar radiation near the heat collector 1, a heat storage tank sensor 18 that detects the water temperature at the bottom of the heat storage tank 2, and a solar radiation sensor 18 that detects the water temperature in the heat collector 1. Heater sensor 19 and heat collector 1
an outside temperature sensor 20 that detects the outside temperature in the vicinity;
The signal from the time program timer device 21 is input, and the heat collection pump 4 is started and stopped, and the water stop valves 5 and 9 are controlled.
and the opening/closing of the drain valve 11.

FIG. 2 shows a specific circuit example of the control device 16, which determines whether the amount of solar radiation detected by the solar radiation amount sensor 17 is sufficient for the water temperature detected by the heat storage sensor 18. , relay X if sufficient
1 and the water temperature detected by the heat collection sensor 19 in the de-energized state of the relay The outside temperature was 0℃
(Freezing danger temperature) or below, relay X2
A freeze detector 23 that excites the freeze detector 23 and a program timer device 2 that excites the
relay
A heat collection pump 4 and a water stop valve 5 are connected in series with the normally open contacts of the
9 parallel circuits are connected, and the drain valve 11 is connected in series with the normally open contact of the relay X2 and the parallel circuit of the time switch 24.

According to this embodiment, during the daytime when there is sunlight,
The heat collection detector 22 uses input from the solar radiation sensor 17 and the heat storage tank sensor 18 to determine whether or not there is sufficient solar radiation for the lower water temperature of the heat storage tank 2, and the heat collection effect is expected. Relay X if possible
1 is energized, the heat collection pump 4 starts operating by being energized, and the water stop valves 5 and 9 are opened by being energized. At this time, since the normally closed contact of the relay X1 of the freeze detector 23 is opened, the relay X2 is not energized, and the drain valve 11 is closed. When the heat collection pump 4 operates, the cold water in the lower part of the heat storage tank 2 is supplied to the heat collector 1 through the outgoing pipe 3.
Water heated using solar heat in the heat collector 1 is returned to the middle part of the heat storage tank 2 via the return pipe 6, and this process is repeated, and hot water using solar heat is stored in the heat storage tank 2. It is used as a heat source for hot water supply and heating and cooling. When the amount of solar radiation is insufficient for the lower water temperature of the heat storage tank 2 and the heat collection detector 22 de-energizes the relay X1, the heat collection pump 4 is stopped and the water stop valves 5 and 9 are closed.

In winter, when the heat collection sensor 19 or the outside temperature sensor 20 detects a low temperature below the freezing danger temperature when the heat collection operation is stopped, the freeze detector 2
3 excites relay X2. At this time, drain valve 1
1 is energized and opens, all the water in the circulation circuit 10 on the collector 1 side when viewed from the water stop valves 5 and 9 flows to the outgoing pipe 3.
The water collects at the lowest part 3a of the water and is discharged from the drain pipe 12 so that no water remains, and protects the heat collector 1, outgoing pipe 3, and return pipe 6 disposed outdoors from bursting due to freezing. Note that water remains in the outgoing pipe 3 and return pipe 6 on the side of the heat storage tank 2 from the water stop valves 5 and 9, but normally, this part is arranged inside the machine room together with the heat storage tank 2.
There is no risk of freezing as sufficient antifreeze treatment is applied. Then, the drain valve 1 by this freeze detector 23
1 is completed by de-energizing the anti-freezing device 23 when the heat collection operation is restarted, or by de-energizing the relay X2 when the anti-freezing device 23 detects a temperature higher than the freezing danger temperature.

The drain valve 11 is opened by the freezing detector 23 described above only in winter, and only on very cold days when the temperature detected by the heat collector sensor 19 and the outside temperature sensor 20 is below the freezing danger temperature. In the example, at a predetermined time (for example, 8:00 p.m.) during a non-heat collecting time period, a short time (for example, 1 minute) close signal is given to the time switch 24 from the program timer device 21, and the drain valve 11 is opened. As a result, the water in the drain pipe 12 stored between the lowest part 3a of the outgoing pipe 3 and the drain valve 11 is replaced with fresh water every day, and the drain pipe 12 is prevented from corroding due to deterioration of water quality. This prevents dirt from clogging and adhering to the drain valve 11, prevents water leakage from the drain pipe 12 from impeding heat collection operation, and prevents the drain function for preventing freezing from being lost.

In addition, in the embodiment described above, the freeze detector 23
The system outputs an output when it detects that the water temperature in the heat collector 1 and the outside temperature are below the freezing danger temperature, but it detects the water temperature or piping temperature in the outgoing pipe 3 and return pipe 6 and freezes. It may be possible to determine the danger.
Further, although water is used as the heat phase transfer liquid, it may be other than water. Furthermore, although the freeze detector 23 and the timer device 21 are provided separately, for example, when a microcomputer with a clock function is used, the control device 16 is configured with one element including the heat collection detector 22. be able to. Furthermore, the timer device 2
In 1, the timer output is emitted once a day, but the timer output may be emitted once a week.In short, the timer output may be emitted periodically to the extent that the heat transfer liquid does not deteriorate. Good.

Since the present invention is constructed as described above, the drain valve is periodically opened for a short period of time by the output of the timer device to prevent liquid from accumulating in the drain pipe for a long period of time, and the freeze detector In severe cold, when the temperature at which the heat transfer fluid reaches a dangerous freezing point, the output of the freeze detector opens the drain valve and drains the fluid from the circulation circuit to prevent the heat collector, outgoing pipes, and return pipes from bursting due to freezing of the heat transfer fluid. None, it prevents corrosion of the drain pipe and clogging of the drain valve without discharging a large amount of heat transfer liquid from the circulation circuit, and prevents liquid from leaking from the drain pipe during long-term use. This prevents thermal operation from being hindered and ensures that liquid is drained during anti-freezing, thereby increasing the reliability and safety of the device and extending its lifespan.

[Brief explanation of the drawing]

The figures relate to one embodiment of the present invention; Fig. 1 is a system diagram showing an example of a solar heat collector;
The figure is an electric circuit diagram showing a specific circuit example of the control device used in FIG. 1. 1... Heat collector, 2... Heat storage tank, 3... Outgoing pipe, 4
... Heat collection pump, 6 ... Return pipe, 10 ... Circulation circuit, 11 ... Drain valve (drain valve), 12 ... Drain pipe (drain pipe), 21 ... Timer device, 23 ... Freezing Detector.

Claims (1)

[Scope of utility model registration request] A heat transfer liquid circulation circuit is connected between the heat collector and the heat storage tank by an outgoing pipe and a return pipe in which a heat collecting pump is installed, and a heat transfer liquid circulation circuit is connected to a lower part of the circulation circuit, and a drain valve An intervening drain pipe, a freeze detector for protecting the circulation circuit that detects the temperature of the heat transfer liquid in the circulation circuit or the freezing danger temperature such as outside temperature and outputs an output, and a periodic short-time timer output. 1. A solar heat collecting device comprising a drain pipe that emits water and a timer device for protecting the drain valve, and an opening command is given to the drain valve by an output of either the freeze detector or the timer device.