JPS60233463A - Heat transfer device - Google Patents

Abstract

PURPOSE:To raise the feeding performance of heat as well as the reliability of a valve mechanism by a method in which a sub-tank is provided on the side of a liquid trap tank, the upper and lower parts of them are connected with a small- diameter tube, and a liquid level sensor is provided in the sub-tank. CONSTITUTION:A sub-tank 14 is joined partly with the side of a liquid trap tank 7 and connected with the tank 7 at the upper and lower parts with small-diameter tubes 15a and 15b. A liquid level sensor 6 is housed in the tank 14 in such a way that a delay of variation in the liquid levels in the tank 14 is occurred in relation to the variation in the liquid level of a working liquid 12 in the tank 7 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. Although the liquid level of the liquid 12 in the tank 7 becomes instabilized by the inflow and outflow of the liquid 12, little effects are affected on the tank 14 and stable actions can be obtained.

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 11 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 placed below a collector 1 (generator) consisting of a plurality of heat collecting pipes, and a second non-return check is placed between the heat exchanger 3 housed within the tank 2 and the collector 1. They are connected by an outgoing pipe 5 provided with a valve 4a. 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, and is connected to the collector 1 through a first check valve 4b.
are connected by a master pipe 9 provided with a liquid reservoir tank 7.
The upper part of the collector 1 is connected to the upper part of the collector 1 by a communication pipe 11 in which an on-off valve 10 (valve mechanism) is provided in the middle. 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 on-off valve 10 is opened by the controller 13, and the upper part of the collector 1 and the upper part of the liquid reservoir tank 7 are connected to the communicating pipe 11. The pressure inside the collector 1 is guided to the liquid reservoir tank 7 , and the working fluid 12 in the liquid reservoir tank 7 is collected into the collector 1 through the original pipe 9 .

When the liquid level of the production liquid 12 decreases and becomes smaller than the set value H, the on-off valve 10 is closed by the controller 13, and the working liquid 1
2 to 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.
Not only does the temperature of 2 rise and the TOKYO HOT efficiency decrease,
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 object, the present invention has a sub-tank installed on the side of a liquid storage tank, the upper and lower parts of which are connected to each other by a small diameter pipe, and a liquid level detection sensor is provided inside the sub-tank. be.

With this configuration, when the hydraulic fluid flows into and out of the reservoir tank, the level of the hydraulic fluid in the sub-tank lags behind the change in the fluid level in the reservoir tank, and the top of the hydraulic fluid in the reservoir tank is The difference between the surface and the bottom liquid level changes depending on the amount of heat transfer.

Description of Example 1 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 its side surface with the liquid reservoir tank 7, has its upper and lower parts connected to each other through small-diameter pipes 15a and 15b, and houses the liquid level detection sensor 6 inside.

The working fluid 12 heated by sunlight and pushed out from the collector 1 (generator) passes through the heat exchanger 3 and flows into the reservoir tank 7, and the level of the hydraulic fluid 12 in the reservoir tank 7 rises. However, since the sub-tank 14 is connected to the liquid reservoir tank 7 through small-diameter pipes 15a and 15b, there is a delay in the rise of the liquid level. When the liquid level of the hydraulic fluid 12 in the sub-tank 14 exceeds the set value H, the on-off valve 10 is opened by the controller 13, and the hydraulic fluid 12#i in the liquid reservoir tank 7 passes through the return pipe 9 and is collected into the collector 1. be done. At this time as well, the liquid level in the sub-tank 14 decreases with a delay compared to the liquid reservoir tank 7.

In this way, in the above embodiment, the sub-tank 1 is connected to the liquid reservoir tank 7 by the small diameter pipes 15a and 15b at the upper and lower parts.
By housing the liquid level detection sensor 6 in the liquid storage tank 7, the change in the liquid level in the sub-tank 14 is delayed with respect to the change in the liquid level of the hydraulic liquid 12 in the liquid storage tank 7. By increasing the difference between the top liquid level and the bottom liquid level, the frequency of opening and closing of the on-off valve 1o is reduced according to the amount of heat transfer, improving the heat exchange performance of the heat exchanger. No more malfunctions. Further, although the liquid level of the hydraulic fluid 12 in the liquid storage tank 7 becomes unstable due to the inflow and outflow of the hydraulic fluid 12, the sub-tank 14 is hardly affected and stable operation can be obtained.

Effects of the Invention In the heat transfer device of the present invention, a sub-tank is provided on the side of a liquid storage tank, the upper and lower parts of which are connected to each other by a small diameter pipe, and a liquid level detection sensor is provided in the sub-tank to control the operation inside the liquid storage tank. Since the difference between the top liquid stop level and the bottom liquid level can be increased, (1) the frequency of opening and closing can be reduced according to the amount of heat transfer, and the heat exchange performance of the heat exchanger can be improved.

(2) Valve mechanism failures are eliminated.

(3) Malfunctions due to turbulence 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, 3... Heat exchanger, 5... Outgoing pipe, 6...
...Liquid level detection sensor, 7.Liquid reservoir, 8.Return pipe, 9.Main pipe, 10.Valve mechanism, 11.Communication pipe,
12... Hydraulic fluid, 14... Sub tank, 15a, b...
・Small diameter tube. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1θ

Claims (1)

[Claims] a generator for generating vapor of a working fluid; a heat exchanger; a liquid reservoir tank located above the generator; a communication pipe connecting the upper part of the generator and the upper part of the liquid reservoir tank; an original pipe that connects the lower part of the liquid storage tank, an outgoing pipe that connects the generator and the heat exchanger, a return pipe that connects the heat exchanger and the liquid storage tank, and a side of the liquid storage tank. A heat transfer system consisting of a sub-tank located on one side of the tank, whose upper and lower parts are connected to each other by a small diameter pipe, and which houses a liquid level detection sensor inside, and a valve mechanism provided on the communication pipe and controlled by the liquid level detection sensor. Device.