JPH0245791B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a non-powered heat transfer device used in solar water heaters, exhaust heat recovery devices, air conditioners, and the like.

Construction of the conventional example and its problems A conventional heat transfer device of this type was constructed as shown in FIG. A heat exchange tank 2 storing hot water is arranged below a collector 1 (generator) made up of a plurality of heat collecting pipes, and the heat exchange tank 2 is housed therein. The heat exchanger 3 and the collector 1 are connected by an outgoing pipe 5 that is provided with a second check valve 4a in the middle. A liquid reservoir tank 7 in which a liquid level detection sensor 6 is housed is arranged above the collector 1, and is connected to the heat exchanger 3 through a return pipe 8.
They are connected by a return pipe 9 provided with a check valve 4b, and the upper part of the liquid reservoir tank 7 and the upper part of the collector 1 are connected by a communication pipe 11 provided with an on-off valve 10 (valve mechanism) in the middle. There is. The liquid level of the hydraulic fluid 12 is controlled by a controller 13 that opens the on-off valve 10 when the liquid level of the hydraulic fluid 12 detected by the liquid level detection sensor 6 becomes larger than a set value H.

The working fluid 12 boils and evaporates when the collector 1 is heated by sunlight, and by increasing the pressure inside the collector 1, the heated working fluid 12 passes through the outgoing pipe 5 and is pushed into the heat exchanger 3, and is transferred to the heat exchange tank. The working fluid 12 that has been cooled by exchanging heat with the hot water in the tank 2 is sent to the liquid storage tank 7 through the return pipe 8, and the level of the working fluid 12 in the liquid storage tank 7 gradually rises. go. When the liquid level of the hydraulic fluid 12 detected by the liquid level detection sensor 6 becomes larger than the set value H, the controller 1
3, the on-off valve 10 is opened and the collector 1 is opened.
The upper part of the collector tank 7 and the upper part of the liquid reservoir tank 7 are communicated with each other by a communication pipe 11, and the pressure inside the collector 1 is guided to the liquid reservoir tank 7.
is collected into the collector 1 through the return pipe 9. When the level of the hydraulic fluid 12 decreases and becomes smaller than the set value H, the controller 13 closes the on-off valve 10 and the collection of the hydraulic fluid 12 to the collector 1 is completed.

In such a configuration, the on-off valve 10 is controlled so that the level of the working fluid 12 in the liquid storage tank 7 reaches the set value H, and the on-off valve 10 is frequently opened and closed. The flow rate of the working fluid 12 passing through the collector 1 decreases, and the heat exchange capacity also decreases, reducing the heat transfer performance from the collector 1 to the hot water supply in the heat exchange tank 2, and the temperature of the working fluid 12 in the collector 1 increases. This not only reduces the heat collection efficiency, but also
Failures of the on-off valve 10 occur frequently. In addition, the hydraulic fluid 12
When the liquid flows in and out, the liquid level becomes unstable, causing the liquid level detection sensor to malfunction.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
The purpose is to improve heat transfer performance and reliability of the valve mechanism.

Structure of the Invention In order to achieve the above object, the present invention houses a liquid level detection sensor in a sub-tank that shares a side surface with a liquid reservoir tank or is in close contact with it and has a communication hole in its lower part.

With this configuration, when the working fluid flows into and out of the liquid storage tank, the sub-tank allows the vapor of the working liquid to exchange heat through the sides of the liquid storage tank and change the volume of the closed space through condensation and evaporation. As the surface changes, the hydraulic fluid level in the sub-tank lags behind changes in the fluid level in the reservoir tank, and the difference between the top and bottom fluid levels of the hydraulic fluid in the reservoir tank increases. Varies depending on the amount of heat transferred.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same members as in FIG. 1 are given the same numbers and their explanations are omitted. The sub-tank 14 shares a part of the side surface with the liquid reservoir tank 7, has a communication hole at the bottom, and houses the liquid level detection sensor 6 inside.

When the collector 1 is heated by solar radiation, the working fluid 12 boils and evaporates, increasing the pressure inside the collector 1, pushing out the heated working fluid 12, sending it under pressure to the heat exchanger 3 through the outgoing pipe 5, and transferring it to the heat exchange tank. The hot water in the hot water tank 2 is made to radiate heat and cool down, and then flows into the liquid storage tank 7 through the return pipe 8. The cooled working fluid 12 condenses the evaporated working fluid 12 in the fluid storage tank 7, and the level of the working fluid 12 in the fluid storage tank 7 rises. The sub-tank 14 communicates with the liquid reservoir tank 7 at the bottom, and the hydraulic fluid 12 tries to flow into it, but since the upper part is a closed space, the vapor of the hydraulic fluid 12 condenses on the side of the liquid reservoir tank 7 and It can only flow in after the volume has decreased. Therefore, compared to the liquid reservoir tank 7, the rise in the level of the hydraulic fluid 12 in the sub-tank 14 is considerably delayed. This delay becomes larger when the amount of solar radiation is high and the amount of heat transfer is large. When the liquid level of the hydraulic fluid 12 in the sub-tank 14 exceeds the set value H, the controller 13 closes the on-off valve 10.
is opened, the upper part of the collector 1 and the upper part of the liquid reservoir tank 7 are communicated through the communication pipe 11, the pressure inside the collector 1 is guided to the liquid reservoir tank, and the hydraulic fluid 12 in the liquid reservoir tank 7 is It passes through the return pipe 9 and is collected by the collector 1. The sub tank 14 contains the hydraulic fluid 12
When the liquid is heated and evaporated by the side surface of the liquid storage tank 7 and its volume increases, the liquid level decreases. Therefore, as when the liquid level rises, the liquid reservoir tank 7
Compared to this, there is a considerable delay in lowering the level of the working fluid 12 in the sub-tank 14. When the liquid level of the hydraulic fluid 12 in the sub-tank 14 becomes lower than the set value H, the on-off valve 10 is closed by the controller 13, and the collection of the hydraulic fluid 12 to the collector 1 is completed.

As described above, in the above embodiment, by housing the liquid level detection sensor 6 in the sub-tank 14 whose upper part is sealed, the liquid level in the sub-tank 14 can be adjusted in response to changes in the liquid level of the working fluid 12 in the liquid reservoir tank 7. By causing a delay in the change and increasing the difference between the top liquid level and the bottom liquid level of the working fluid 12 in the liquid storage tank 7, the frequency of opening and closing of the on-off valve 10 is reduced according to the amount of heat transfer. , the heat exchange performance of the heat exchanger is improved, and failures of the on-off valve 10 are also eliminated.

Effects of the Invention The heat transfer device of the present invention has a liquid level detection sensor housed in a sub-tank that shares a side surface with a liquid reservoir tank or is in close contact with it and has a communication hole at the bottom.
The difference between the top liquid level and the bottom liquid level of the working fluid in the liquid storage tank changes depending on the amount of heat transferred, (1) the heat exchange performance of the heat exchanger improves (2) the frequency of opening and closing of the valve mechanism increases. The reliability of the valve mechanism is improved. (3) Stable operation is achieved by eliminating malfunctions caused by turbulence in the liquid level when the hydraulic fluid flows in and out.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a conventional heat transfer device, and FIG. 2 is a configuration diagram of a heat transfer device showing an embodiment of the present invention. 1... Generator, 2... Heat exchange tank, 3... Heat exchanger, 4a... Second check valve, 4b... First check valve, 5... Outgoing pipe, 6... Liquid level detection Sensor, 7...
...Liquid storage tank, 8...Return pipe, 9...Return pipe, 10
... Valve mechanism, 11 ... Communication pipe, 12 ... Hydraulic fluid,
14...Subtank.

Claims (1)

[Claims] 1. A generator in which a working fluid of a latent heat medium is sealed and generates its vapor, a heat exchanger installed in a heat exchange tank located below the generator, and a liquid reservoir tank located above the generator. a communication pipe that connects the upper part of the generator and the upper part of the liquid reservoir tank; a return pipe that connects the generator and the lower part of the liquid reservoir tank and is provided with a first check valve in the middle; an outgoing pipe that connects the heat exchanger, a return pipe that connects the heat exchanger and the liquid reservoir tank, a second check valve provided on the outgoing pipe or the return pipe, and the liquid reservoir tank. A heat transfer device consisting of a sub-tank that shares or closely contacts side surfaces, has a communication hole at the bottom, and houses a liquid level detection sensor inside, and a valve mechanism that is provided on the communication pipe and is controlled by the liquid level detection sensor. .