JPS61114089A - Heat transmission device - Google Patents

Abstract

PURPOSE:To increase the amount of working liquid to be transmitted, reduce the valve actuation frequency and consequently stabilize the heat transmission of the titled device by a structure wherein a means for delaying the falling speed of a float in a liquid receiver tank is provided in a non-powered heat transmission device such as employed in a solar heat collecting system or the like. CONSTITUTION:When a float 12 is raised by the inflowing of working liquid 1 into the lower chamber 5 of a liquid receiver tank 6, the float 12 is attracted by a magnet 17 so as to contact with the underside of a connecting port 11. At this time, a valve 14 is brought into open state, resulting in allowing the working liquid 1 in the lower chamber 5 to be pushed through a return pipe 9 out of the lower chamber. However, the float 12 does not lower itself with the lowering of the liquid level, because the float 12 is attracted by the magnet 17. The float 12 falls down suddenly when the attractive force of the magnet 17 becomes smaller than the resultant force of the weight of the float 12 subtracted by the buoyant force applied on the float 12. By properly selecting the magnetic force of the magnet 17 based upon the weight and volume of the float 12 and the specific weight of the working liquid 1, the float 12 can be set so as to fall down at the instant, when the liquid 1 in the tank 6 is exhausted, resulting in utilizing the inner volume of the tank 6 as the delivery volume per one delivery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a non-powered heat transfer device applied to solar heat collection systems, waste heat recovery systems, and the like.

2. Description of the Related Art As shown in FIG. 2, a conventional heat transfer device of this type is provided with a heat exchanger 3 for heat radiation below a generator 2 in which a working fluid 1 as a latent heat medium is sealed, and an upper chamber 4 and an upper chamber 4 above. A liquid storage tank 6 consisting of a lower chamber 5 is provided, the generator 2 and the heat exchanger 3 are connected by an outgoing pipe 7, the heat exchanger 3 and the lower chamber 5 are connected by a return pipe 8, and the lower chamber 5 and the generator 2 were connected by a return pipe 9, and further, the upper chamber 4 and the generator 2 were connected by a communication pipe 10. Connection port 1 connecting upper chamber 4 and lower chamber 5 of liquid storage tank 6
1 was provided with a valve 14 that was opened and closed by the vertical movement of a float 12 installed in the lower chamber 5.

Further, the return pipe 9 was provided with a first check valve 15a, and the return pipe 8 was provided with a second check valve 15b. To explain the state of heat transfer in the above configuration, when the working fluid 1 in the generator 2 is heated, it evaporates and the internal pressure increases, so the high temperature working fluid 1 flows into the heat exchanger 3 through the outgoing pipe 7. and releases heat.

At this time, the working fluid 1 cooled by the heat exchanger a flows into the lower chamber No. 5 of the liquid storage tank 6 through the return pipe 8, and floats into the float 12.
push up. When the liquid level of the working fluid 1 in the liquid storage tank 6 rises and the float 12 rises, the valve 14 is pushed up and the connection port 11
In order to open the generator 2, the vapor of the working fluid 1 in the generator 2 is introduced into the upper chamber 4 through the communication pipe 10 and into the lower chamber 5 through the connection port 11.

Therefore, since the pressures in the generator 2 and the lower chamber S are approximately the same, the working fluid 1 in the lower chamber 5 passes through the return pipe 9 to the generator 2.
will be returned to by gravity.

In addition, the liquid level of the working fluid 1 in the lower chamber 5 decreases to 71
When the funnel 12 is pushed down and the valve 14 closes the connection port 11, the working fluid 1 is again pressure-fed from the generator 2 to the heat exchanger 3 and heat transfer is performed. Thereafter, by repeating the same operation, the heat obtained by the generator 2 was transferred to the heat exchanger 3.

Problems to be Solved by the Invention However, conventional heat transfer devices of this type have the following problems.

(1) The amount of hydraulic fluid transported by each opening/closing operation of the valve 14 is determined by the amount of head during the time from opening to closing of the valve, so in order to increase the amount of fluid transported, the cross-sectional area of the lower chamber must be Therefore, the liquid storage tank cannot be made smaller.

(2) In order to increase the conveyance amount, it is necessary to increase the frequency of opening and closing of the valve 14, and as a result, a problem arises in the durability of the valve 14.

(3) At the moment when the float 12 opens or closes the valve 14, the float swings due to the movement of the hydraulic fluid level in the lower chamber, resulting in a problem that the operation is unstable.
*.

Means for Solving the Problems In order to solve the conventional problems, the present invention provides a delay means for delaying the descending speed of the float. In an embodiment, the delay means includes a magnet provided on the top of the float or the connection port, and a magnetic material provided on the contact surface of the magnet.

With this configuration, when the working fluid flows into the lower chamber of the liquid storage tank and the float rises, the float is attracted to the lower surface of the connection port by the upper magnet.

At this time, the valve becomes open and the working fluid in the lower chamber is pushed out from the pipe, but since the float is attracted by the magnet, it does not fall as the liquid level drops, and the attraction force of the magnet The moment the difference between the weight of the float and the buoyancy becomes smaller, the float will suddenly fall. By appropriately selecting the magnetic force of the magnet based on the weight and volume of the float and the specific gravity of the hydraulic fluid, it is possible to set the float to fall the moment the hydraulic fluid in the liquid storage tank is discharged. This allows the internal volume of the liquid storage tank to be utilized as effectively as possible as the amount of fluid to be delivered during one cycle.

On the other hand, after the float falls, the valve can be closed instantly, and when the float rises and approaches the connection port, it is attracted by magnetic force and the valve opens instantly, so the swinging of the float is not transmitted to the valve. Embodiment 1 An embodiment of the present invention will be described below with reference to FIG. 1. 1st
In the figure, 1 is the working fluid of the latent heat medium, 2 is the generator, a is the heat exchanger, 4 is the upper chamber, 6 is the lower chamber, 6 is the liquid storage tank,
7 is an outgoing pipe, 8 is a return pipe, 9 is a return pipe, 10 is a communicating pipe, 11 is a connection port, 12 is a float, 13 is a shaft, 14 is a valve, 15a
15b is a second check valve, 16 is a partition plate made of a magnetic material, and 17 is a magnet.

Note that the same members as in FIG. 2 are given the same numbers.

In the above configuration, the float 12 in the liquid storage tank 6 can close the vent valve after all the working fluid has been sent out, so the internal volume of the liquid storage tank 6 can be effectively utilized.
can be made smaller. Also, the opening/closing operation of the valve 14 is controlled by the float 1.
Since the valve 14 is less susceptible to the fluctuation of the liquid level, the switching operation of the valve 14 can be performed stably.

In this embodiment, the magnet 17 is provided above the float and the partition plate 16 is made of a magnetic material, but it goes without saying that the magnet 17 may be fixed to the lower surface of the partition plate and the upper surface of the float 12 made of a magnetic material.

Effects of the Invention As described above, the heat transfer device of the present invention provides the following effects.

(1) Since the flow rate delivered by each opening/closing operation of the valve can be increased, the internal volume of the liquid storage tank can be reduced in size.

(2) Furthermore, since the opening/closing cycle becomes longer for the same amount of delivery, the frequency of opening/closing of the valve decreases and the durability of the valve improves.

(3) Even if the liquid level of the hydraulic fluid in the liquid storage tank fluctuates, the valve
Opening/closing operation (no chattering, instantaneous and stable opening/closing operation) enables stable heat transfer.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the heat transfer device of the present invention,
FIG. 2 is a configuration diagram showing a conventional heat transfer device. 1... Working fluid, 2... Generator, 3...
... Heat exchanger, 4 ... Upper chamber, 5 ...
...lower chamber, 6...liquid storage tank, 7...
・Outward pipe, 8...Return pipe, 9...Return pipe, 1
0...Communication pipe, 11...Connection port, 12
...Float, 14...Valve, 15a.
...First check valve, 15b...Second check valve, 17...Magnet. Name of agent Patent attorney Toshio Nakao and 1 other person/5 Figure 1 7 Kakan Figure 2 4 Kamigunou 7 Seikan

Claims (2)

[Claims] (1) A generator in which a working liquid of a latent heat medium is sealed, a heat exchanger provided below the generator, and a liquid reservoir provided above the generator and having two spaces, an upper chamber and a lower chamber. a tank, an outgoing pipe that connects the generator and the heat exchanger, a return pipe that connects the heat exchanger and a lower chamber of the liquid storage tank, and a lower chamber of the liquid storage tank and the generator. a communication pipe connecting the generator and the upper chamber of the liquid storage tank; a first check valve provided in the return pipe; and a first check valve provided in the outgoing pipe or the returning pipe. a second check valve;
a float movably provided in a lower chamber of the liquid storage tank; a valve provided at a connection port connecting the upper chamber and the lower chamber of the liquid storage tank; the float that opens and closes the valve; A heat transfer device provided with a delay means for delaying the descending speed of the float. (2) The heat transfer device according to claim 1, wherein the delay means utilizes the magnetic force of a magnet provided at the top of the float or at the connection port.