JPS60233464A - Heat transfer device - Google Patents

Abstract

PURPOSE:To raise the feeding performance of heat as well as the reliability of valve mechanism by providing a liquid level sensor in a subtank whose side is closely joined with a liquid trap tank and the lower part is provided with a communication hole. CONSTITUTION:A subtank 14 is partly joined with a liquid trap tank 7 at its side and provided with a communication hole in its lower part. A liquid level sensor 6 is housed in the tank 14 whose upper part is enclosed in such a way that the variation in the liquid level of a working liquid 12 in the tank 7 is delayed from the variation in the liquid level in the tank 14 and the difference between the upper stop liquid level and the lower stop liquid level of the liquid 12 in the tank 7 is made greater. The opening and closing frequency of the valve 10 is reduced according to the amount of heat to be fed, the performance of the heat exchanger is raised, and the disorder of the valve 10 is avoided.

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, waste heat recovery devices, air conditioners, and the like.

Conventional structure 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) consisting of a plurality of heat collecting pipes.
, the heat exchanger a housed therein and the collector 1 are connected by an outgoing pipe 5 having 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 IL and heat exchanger 3 through a return pipe 8. A first check valve 4b is connected to the γL1 collector 1 on the way. The upper part of the liquid reservoir tank 7 and the upper part of the collector 1 are connected by a master pipe 9 provided with an on-off valve 10 (
They are connected through a communication pipe 11 provided with a valve mechanism (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.
ing.

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, where it is heated. The working fluid 12, which has been cooled by heat exchange with the hot water in the exchange tank 2, is sent to the liquid reservoir tank 7 through the return pipe 8, and the level of the working fluid 12 in the fluid reservoir tank 7 gradually rises. I will do it. When the liquid level of the working fluid 12 detected by the liquid level detection sensor 6 becomes larger than the set value H, the controller 13 opens the on-off valve 10, and the upper part of the collector 1 and the upper part of the liquid reservoir tank 7 communicate with each other. The pressure inside the collector 1 is guided to the liquid reservoir tank 7 through a pipe 11, and the working fluid 12 in the liquid reservoir tank 7 is collected into the collector 1 through the original 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 hydraulic fluid 1
2 to collector 1 is completed.

In such a configuration, the on-off valve 10 is controlled so that the liquid 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.
Not only does the temperature of 2 rise and the heat collection efficiency decreases,
Failures of the on-off valve 10 occur frequently. Furthermore, when the working fluid 12 flows in and out, the fluid level becomes unstable, causing the fluid level detection sensor to malfunction.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to improve heat transfer performance and reliability of a valve mechanism.

Structure of the Invention In order to achieve the above-mentioned object, the present invention houses a liquid level detection sensor in a sub-tank that shares a side surface with a liquid storage tank, is in close contact with the sub-tank, and has a communication hole at the bottom.

With this configuration, when the working fluid flows into and out of the reservoir tank, the liquid level in the sub-tank changes as the vapor of the working fluid transfers heat through the sides of the reservoir tank, changing the volume of the closed space through condensation and evaporation. Therefore, the liquid level of the working fluid in the sub-tank lags behind the change in the liquid level of the liquid reservoir tank, and the difference between the top liquid level and the bottom liquid level of the hydraulic fluid in the liquid storage tank is the amount of heat transferred. It changes depending on.

★Explanation of the male side An embodiment of the present invention will be described with reference to FIG. 2.

The same members as in FIG. 1 are given the same numbers and their explanations are omitted. The sub-tank 14 shares all 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 sunlight, the working fluid 12 boils and evaporates, increasing the pressure inside the collector 1, pushing out the heated working fluid 12, and sending it under pressure through the outgoing pipe 5 to the heat exchanger 3, where it is heat exchanged. Heat is radiated to the hot water in the tank 2 to cool it and return to the pipe 8
through which the liquid flows into the liquid reservoir tank 7. The cooled working fluid 12 condenses the vapor of the 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 drift, but since the upper part is a closed space, the vapor of the first hydraulic fluid 12 condenses on the side of the liquid reservoir tank 7, causing it to drift. It can only flow in after the volume has reached a little over 4.

During this seventh period, the level of the hydraulic fluid 12 in the sub-tank 14 rises with considerable delay compared to the fluid reservoir tank 7. This slow fL becomes large such as #1 when the amount of solar radiation is high and the amount of heat transfer is large.

When the liquid level of the working fluid 12 in the sub-tank 14 exceeds the set value H, the on-off valve 10 is opened by the controller 13 fL.
, the upper part of the collector 1 and the upper part of the liquid reservoir tank 7 are connected to the communication pipe 1.
1 communicates with 7L, the pressure inside the collector 1 is guided to the liquid reservoir tank n1, and the working fluid 12 in the liquid reservoir tank 7 is connected to the main pipe 9.
It passes through and is collected by collector 1. In the sub-tank 14, when the working fluid 12 is heated from the side surface of the liquid reservoir tank 7 and evaporated, and its volume increases, the liquid level decreases. Therefore, similarly to when the liquid level rises, the liquid level of the working fluid 12 in the sub-tank 14 lowers much more slowly than in the liquid reservoir tank 7. 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 recovery of the hydraulic fluid 12 to the collector 1 is completed.

In this way, in the above embodiment, the liquid level detection sensor 6
By storing the liquid in the sub-tank 14 whose upper part is sealed, a delay is caused in the liquid level change in the sub-tank 14 with respect to the liquid level change of the working fluid 12 in the liquid storage tank 7,
By increasing the difference between the top liquid level and the bottom liquid level of the working fluid 12 in the liquid reservoir tank 7, the on-off valve 1 is adjusted according to the amount of heat transferred.
Opening/closing frequency of 0? : It improves the heat exchange performance of the heat exchanger and eliminates the failure of the on-off valve 10.

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 or is in close contact with the side surface of the liquid reservoir tank and has a communication hole at the bottom. The difference between the stop liquid level and the bottom stop liquid level changes according to the amount of heat transfer, 1) The heat exchange performance of the heat exchanger is improved (the frequency of opening and closing of the two-valve mechanism is reduced, and the reliability of the valve mechanism is improved) (3
) Malfunctions due to disturbances in the liquid level when the working fluid flows in and out are eliminated, and stable operation is achieved.

[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,
a...Heat exchanger, 4a...Second check valve, 4b...First check valve, 5...Outgoing pipe,
6...Liquid level detection sensor, 7...Liquid reservoir tank, 8...Return pipe, 9...Main pipe, 1
0... Valve mechanism, 11... Communication pipe, 12
......Hydraulic fluid, 14...Sub tank. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure O Figure 2 Iθ

Claims (1)

[Claims] a generator that generates steam in which a working fluid as a latent heat medium is sealed; a heat exchanger installed in a heat exchange tank located below the generator; and a liquid reservoir located above the generator. a tank, a communication pipe connecting the upper part of the generator and the upper part of the liquid reservoir tank, a master pipe connecting the generator and the lower part of the liquid reservoir tank and having a first check valve in the middle, and the generator. an outgoing pipe that connects the heat exchanger and the liquid reservoir tank, 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 sub-tank that shares a side surface with or is in close contact with the sub-tank, has a communication hole at the bottom and houses a liquid level detection sensor therein, and a valve mechanism that is provided on the communication pipe and is slightly controlled by the liquid level detection sensor. A heat transfer device consisting of.