JPH0423179B2 - - 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.

Conventional Structure and Problems Conventionally, this type of heat transfer device has been structured as shown in FIG. A heat exchange tank 2 storing hot water is arranged below a collector 1 (generator) consisting of a plurality of heat collecting pipes, and a check valve 4a is installed between the heat exchanger 3 housed in the tank 2 and the collector 1. They are connected by an outgoing pipe 5 provided with a. A liquid reservoir tank 7, in which a liquid level detection sensor 6 is housed, is arranged above the collector 1, connected to the heat exchanger 3 through a return pipe 8, and connected to the collector 1 with a check valve 4b on the way. The upper part of the liquid reservoir tank 7 and the upper part of the collector 1 are connected by a return pipe 9, and an on-off valve 1 is provided in the middle.
0 (valve mechanism) is connected through a communication pipe 11 provided with a valve mechanism. 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, which has been cooled by heat exchange with the hot water supply 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 this configuration, from the liquid reservoir tank 7 to the collector 1
When recovering the working fluid 12, the liquid as well as the vapor of the working fluid 12 simultaneously flow from the upper part of the collector 1 through the communication pipe 11 into the fluid reservoir tank, so that the pressure inside the collector 1 is normally guided to the fluid reservoir tank. This poses a problem in that the recovery of the working fluid 12 is hindered, and furthermore, the recovered working fluid 12 flows back into the fluid reservoir tank 7, prolonging the recovery time and degrading heat transfer performance.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems and aims to improve the heat transfer performance from the generator to the heat exchanger.

Structure of the Invention In order to achieve the above object, the present invention provides a sub-tank below the outlet of a generator, and a communication pipe with a valve mechanism disposed between the upper part of the sub-tank and the upper part of the liquid reservoir tank, and the outlet of the generator are connected by a return pipe, and the lower part of the sub-tank and the heat exchanger are connected by an outgoing pipe. With this configuration, a higher pressure than the outlet of the generator is guided to the liquid reservoir tank, thereby facilitating recovery of the working liquid.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Note that the same members as in FIG. 1 are given the same numbers and their explanations are omitted. A sub-tank 14 is provided below the upper header of the collector 1 (generator),
The upper part of the sub-tank 14 and the upper part of the liquid storage tank are connected by a communication pipe 11, the upper part of the sub-tank 14 and the upper header of the collector 1 are connected by a return pipe 15, and the lower part of the sub-tank 14 and the heat exchanger 3 are connected by an outgoing pipe 5. has been done.

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 is sent to the sub-tank 14 in two phases of gas and liquid, where the gas and liquid are separated. The working fluid 12 is forced into the heat exchanger 3 through the outgoing pipe 5, and the cooled working fluid 12 exchanges heat with the hot water in the heat exchange tank 2 and is then passed through the returning pipe 8 and flows into the liquid reservoir tank 7. The liquid level of the working fluid 12 in the fluid reservoir tank 7 gradually rises. Surface detection sensor 6
When the liquid level of the hydraulic fluid 12 detected by the controller 13 becomes larger than the set value H, the on-off valve 10 is opened by the controller 13, and the upper part of the sub-tank 14 and the upper part of the liquid reservoir tank 7 are communicated with each other through the communication pipe 11. The pressure inside the sub-tank 14 is guided to the liquid reservoir tank 7, the vapor of the working fluid 12 in the upper part of the sub-tank 14 is sent to the liquid reservoir tank 7, and the cooled working fluid 12 in the liquid reservoir tank 7 is returned to the return pipe 9. It is sent to the lower part of the collector 1 through the collector 1 and collected by the collector 1. When the liquid level of the hydraulic fluid 12 in the liquid storage tank 7 decreases and becomes smaller 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.

In this way, in the above embodiment, the collector 1
The high-temperature vapor of the working fluid 12 generated is sent to the sub-tank 14 in a gas-liquid two-phase state, and the gas and liquid are separated, and the vapor is stored in the upper part and the liquid is stored in the lower part, so when the working fluid 12 is collected, the inside of the collector 1 is The temperature and pressure of the working fluid 12 recovered from the liquid storage tank 7 decreases, but since the temperature inside the sub-tank 14 remains high, the pressure does not drop and a higher pressure than inside the collector 1 is passed through the communication pipe 11. By shortening the recovery time of the working fluid 12 by guiding it to the fluid storage tank,
It is possible to improve heat transfer performance and heat collection efficiency.

Effects of the Invention The heat transfer device of the present invention is provided with a sub-tank below the outlet of the generator, and the upper part of the sub-tank and the upper part of the liquid reservoir tank are connected by a communicating pipe with a valve mechanism in the middle, and the upper part of the sub-tank and the generator Since the outlet of the tank is connected with a return pipe, and the lower part of the sub-tank and the heat exchanger are connected with an outgoing pipe, the working fluid that has been cooled by exchanging heat with the heat exchanger and stored in the reservoir tank is transferred to the valve. When the mechanism is opened and the fluid is recovered to the generator through the return pipe, the temperature inside the generator drops and the pressure drops accordingly, but the high temperature working fluid remains in the sub-tank, which is independent of the generator. It exists in a gas-liquid two-phase state and the pressure does not decrease. Therefore, the high pressure in the sub-tank is introduced into the liquid reservoir tank through the communication pipe, so that a pressure difference is generated in the generator where the pressure decreases, and the recovery time of the working liquid is shortened. Even when the recovery of the working fluid to the generator is completed and the valve mechanism is closed, the high temperature working fluid accumulated in the sub-tank is sent to the heat exchanger for heat exchange, improving heat exchange performance. In this way, the introduction of pressure into the liquid reservoir tank during recovery of the working fluid and the transition from completion of recovery of the working fluid to heat exchange are performed smoothly, so that heat transfer performance is improved. Moreover, there is no fear that the working fluid from the sub-tank will flow back into the low-pressure generator.

[Brief explanation of drawings]

Figure 1 is a system diagram of a conventional heat transfer device, Figure 2 is a system diagram of a conventional heat transfer device.
The figure is a system diagram of a heat transfer device according to an embodiment of the present invention. 1... Generator, 2... Heat exchange tank, 3... Heat exchanger, 4a, 4b... Check valve, 5... Outgoing pipe, 6
...Liquid level detection sensor, 7...Liquid reservoir tank, 8
... Return pipe, 9 ... Return pipe, 10 ... Valve mechanism, 11 ...
...Communication pipe, 12...Hydraulic fluid, 14...Sub tank, 15...Return pipe.

Claims (1)

[Claims] 1. A generator that is sealed with a working fluid and generates steam, a heat exchanger installed in a heat exchange tank located below the generator, and a liquid level detection sensor located above the generator. a liquid storage tank in which is stored, a return pipe that connects the heat exchanger and the liquid storage tank, and a return pipe that connects the liquid storage tank and the inlet of the generator and is provided with a check valve in the middle. a sub-tank provided below the outlet of the generator; a communication pipe connecting the upper part of the sub-tank and the upper part of the liquid reservoir tank and having a valve mechanism in the middle thereof controlled by the liquid level detection sensor; A heat transfer device comprising a return pipe that connects the upper part of the sub-tank and the outlet of the generator, and an outgoing pipe that connects the lower part of the sub-tank and the heat exchanger and is provided with a check valve in the middle.