JPS581732Y2 - Collector dry firing temperature rise prevention device - Google Patents

Description

[Detailed Description of the Invention] In the present invention, the heat storage tank 1, the circulation pump 4, the collector 2, and the heat storage tank 1 constitute a first circulation flow channel, and
The heat radiation circuit 3, the circulation pump 4, the collector 2, and the heat radiation circuit 3 constitute a second circulation flow channel, and the water temperature t of the heat storage tank 1
flow channel switching means for switching from the first circulating flow channel to the second circulating flow channel when the temperature tc of the heat collector 5 of the collector 2 rises to a predetermined temperature and the surface temperature tc of the heat collector 5 of the collector 2 rises to the dry firing temperature; When the water temperature ts in the tank 1 is below a predetermined temperature, the water temperature ts is above a predetermined temperature, and the surface temperature tc of the heat collector 5 rises to the dry firing temperature, the circulation pump 4 is operated, and the temperature inside the heat storage tank 1 is When the water temperature ts is above a predetermined temperature, the surface temperature tc of the heat collector 5
The present invention relates to a collector dry-fire temperature rise prevention device comprising a control means for stopping the circulation pump 4 if the temperature is lower than the dry-fire temperature.

Figure 1 shows a water heater system using a solar collector, in which a circulating pump 4 collects heat from the heat storage tank 1 by passing it through the collector 2, and returns the collected water to the heat storage tank 1. It forms a circular flow channel.

Incidentally, in the collector 2 shown in FIG. 2, an inexpensive non-metallic material such as polyethylene may be used as the heat collector 5, but in the water flow system described above, water does not flow into the flow channel in the heat collector 5. If it is not included, there is a drawback that the surface temperature of the heat collector 5 rises, slightly exceeding the softening temperature of the material (non-metallic material such as polyethylene), and the heat collector 5 deforms.

In the figure, 6 is a heat insulating material, 7 is a side wall, 8 is a plywood bottom plate, and 9 is a transparent plate made of glass or the like.

Therefore, in the conventional water heater system, water is constantly circulated through the collector 2 to store heat in the heat storage tank 1 during periods of sunlight.

However, this method has a drawback that even when heat is sufficiently stored in the heat storage tank 1, heat continues to be stored there, causing the water in the heat storage tank 1 to boil.

Therefore, when the temperature inside the heat storage tank 1 exceeds a certain value, the operation of the circulation pump 4 is stopped, heat storage in the heat storage tank 1 is stopped, and the heat collector 5
There is a method to operate the circulation pump 4 when the surface temperature (dry firing temperature) reaches a certain temperature or higher to prevent the heat collector 5 from softening and deforming. For example, when the circulation pump 4 is operated continuously, there is a drawback that the water in the heat storage tank 1 boils.

The present invention was developed in view of the above-mentioned drawbacks, and its purpose is to provide a collector dry heating temperature rise prevention device that can prevent the water in the heat storage tank from boiling and at the same time prevent the collector from dry heating. It is on offer.

The present invention will be explained below with reference to examples. FIG. 3 shows a schematic configuration diagram of one embodiment.

The heat storage tank 1 sends water to the collector 2 via the circulation pump 4, and the collector 2 sends the water that has collected heat to the heat storage tank 1 via the normally open flow path of the three-way solenoid valve 10.

The heat dissipation circuit 3 has one end connected to the outlet of the collector 2 via a normally closed flow channel of the electromagnetic valve 10, and the other end connected to the inlet of the circulation pump 4.

Reference numeral 11 in the figure is a control section, and this control section 11 is connected to the heat storage tank 1.
It has a temperature detection element a installed inside the collector 2 to detect the water temperature ts, and a temperature detection element s installed inside the collector 2 to detect the surface temperature tc of the heat collector 5, so that the water temperature ts inside the heat storage tank 1 is a predetermined temperature. Below, when the water temperature ts is above a predetermined temperature and the surface temperature tc of the heat collector 5 rises to the dry firing temperature, the circulation pump 4 is operated, and when the water temperature ts in the heat storage tank 1 is above the predetermined temperature,
If the surface temperature tc of the heat collector is below the dry firing temperature, a control operation is performed to stop the circulation pump 4, and the solenoid valve 10 is turned off if the water temperature ts in the heat storage tank 1 is above a predetermined temperature.
It controls to open normally closed flow channels and close normally open flow channels.

Therefore, the surface temperature tc of the heat collector 5 of the collector 2 is now the dry firing temperature (for example, if the heat collector 5 is made of polyethylene, it is about 1
30°C) or lower and the water temperature ts in the heat storage tank 1 is below a predetermined temperature, water flows through the heat storage tank 1, the circulation pump 4, the collector 2, the solenoid valve 10, and the circulating ice passage of the heat storage tank 1, and the water flows in the collector 2. The collected water is put into a heat storage tank 1 to store heat.

Next, when the water temperature ts in the heat storage tank 1 rises to a predetermined temperature or higher, the control unit 11 stops the operation of the circulation pump 4 to stop heat storage, and causes water to stay in the flow channel in the heat collector 5 of the collector 2. .

When the surface temperature tc of the heat collector 5 of the collector 2 rises to the dry firing temperature, the control unit 11 operates the solenoid valve 10 to open the normally closed flow channel, close the normally open flow channel, and close the circulating pump 4. drive again.

Therefore, water flows through the collector 2, the solenoid valve 10, the heat radiation circuit 3, the circulation pump 4, the circulation flow channel of the collector 2, and the heat radiation circuit 3.
Heat is dissipated.

As a result, the water temperature ts in the heat storage tank 1 does not rise, and the surface temperature tc of the heat collector 5 can be kept below the dry heating temperature.

The structure of the heat collector 5 is the same as the structure shown in FIG. 2, so illustration thereof is omitted in the embodiment.

FIG. 4 shows an application example of the present invention, in which the heat dissipation circuit 3 is buried underground, the heat storage tank 1, the electromagnetic valve 10
, a first circulation flow channel of the circulation pump 4, the collector 2, and the heat storage tank 1, and a second circulation flow channel of the heat storage tank 1, the electromagnetic valve 10, the heat radiation circuit 3, the circulation pump 4, the collector 2, and the heat storage tank 1. The water temperature ts in the heat storage tank 1 rises to a predetermined temperature,
When the surface temperature tc of the heat collector 5 reaches the dry heating temperature, the second
Water from the heat storage tank 1 radiates heat in the heat radiation circuit 3, enters the collector 2, lowers the temperature of the heat collector 5, and returns to the heat storage tank 1. Does not store heat.

In the summer, when the first circulation waterway is configured, the water radiated by the collector 2 is used to store heat in the heat storage tank 1.

In winter, even if the surface temperature tc of the heat collector 5 becomes high, the heat collector 5 will not be softened and deformed because the outside temperature is low.

Therefore, the water temperature te in the heat dissipation circuit 3 and the water temperature ts in the heat storage tank 1 are compared, and if ts > te, heat is collected in the first circulating flow channel, and if tS<te, the second circulating flow channel is collected. The heat dissipation circuit 3 extracts geothermal heat from the ground, and the collector 2 collects the heat and returns it to the heat storage tank 1.

In this way, heat is stored underground in the summer and consumed underground in the winter.

If the heat stored in the ground is stored in a place where it reaches the ground surface with a six-month delay, it will reduce the heating load on solar house A in winter, and prevent the temperature from rising when the collector is fired empty.

Since the present invention is configured as described above, the temperature of the collector's heat collector can be lowered without increasing the water temperature in the heat storage tank, and dry heating of the heat collector can be prevented. It has the advantage of not causing softening and deformation even if an inexpensive material such as polyethylene is used for the heat collector.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a conventional example, FIG. 2 is a sectional view of a collector, FIG. 3 is a schematic diagram of an embodiment of the present invention, and FIG. 4 is a schematic diagram of an applied example of the present invention. Heat storage tank, 2 is collector,
3 is a heat radiation circuit, 4 is a circulation pump, 5 is a heat collector, 10 is a solenoid valve, 11 is a control unit, ts is the water temperature in the heat storage tank, and tc is the surface temperature of the heat collector.

Claims (1)

[Scope of utility model registration request] The heat storage tank, the circulation pump, the collector, and the heat storage tank are
The heat radiation circuit, the circulation pump, the collector, and the heat radiation circuit constitute a second circulation flow waterway, and the water temperature in the heat storage tank rises to a predetermined temperature and the heat collector of the collector flow channel switching means for switching from the first circulating flow channel to the second circulating flow channel when the surface temperature of the heat storage tank rises to the dry firing temperature; The circulation pump is operated when the surface temperature of the heat collector rises to the dry-burning temperature, and if the water temperature in the heat storage tank is above a predetermined temperature and the surface temperature of the heat collector is below the dry-burning temperature, the circulation pump is operated. A collector dry firing temperature rise prevention device comprising a control means for stopping the collector dry firing temperature rise prevention device.