JPS6272975A - Thermosensitive type flow adjusting valve - Google Patents

Abstract

PURPOSE:To prevent a thermosensitive element from being corroded by fluid, by using a heat pipe to transmit heat from a temperature detecting position to the thermosensitive element. CONSTITUTION:A valve element 25 for opening and closing a valve hole 23 is attached to a valve rod formed of a heat pipe 26. The heat pipe 26 extends upward from the valve element 25, crossing a fluid passage, and is slidably fitted and held at its upper end in a hole 28a in an adjusting cylinder 28. Further, a thermosensitive element 29 composed of a plurality of bimetal discs 33 which are stacked being alternately reversed, is disposed between a spring retainer 32 secured to the intermediate section of the heat pipe 26 within a hollow section 31 in a partition wall 27, and the lower end of the adjusting cylinder 28. With this arrangement, the thermosensitive element 29 may be prevented from being exposed directly to fluid, thereby it is possible to prevent the thermosensitive element from being corroded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heat treatment system that adjusts the flow rate by changing the degree of opening of the valve depending on the temperature of a fluid passing through the valve or the temperature of another fluid. This invention relates to a sensitive flow rate control valve.

<Prior Art> Among the conventional valves of this type, there is one disclosed in Japanese Patent Publication No. 59-'7880, which is a fake. Namely.

As shown in FIG. 3, a bimetal block 9 and a coil spring 14 are provided that act on the valve body 11, and when the temperature of the fluid flowing therein changes from low to high temperature, the valve body 11 moves in the valve closing direction. In the opposite case, the valve body 11 is displaced in the valve closing direction. In the illustrated state, the fluid temperature on the side of the valve body 5 is high and exceeds the total bending force of the bimetal disk 10 constituting the bimetal block 9 or the elastic force of the coil spring 14, and the valve body 1 closes the valve port 6. It is fully open.

When the temperature of the fluid at population 5IlliI becomes low and the elastic force of the coil spring 14 exceeds the bending force of the bimetal block 9, and this valve opening force exceeds the valve closing force consisting of the differential pressure acting across the valve opening, The valve body 11 opens the valve port 6 and discharges the low temperature fluid on the inlet side 5 to the outlet side 7. Since the pressure on the valve port 6 side can be set arbitrarily by adjusting the coil spring 19 acting on the valve body 18, the opening/closing valve temperature can be changed.

<Problems to be Solved by the Invention> In the conventional valve (temperature control trap) described above, the bimetal block, which is the heat-sensitive element, lies horizontally and is directly exposed to the fluid passing through it. Therefore.

Depending on the type of fluid used, there is a problem that the heat-sensitive element may rust or corrode.

Means for Solving the Problems> This invention provides a heat-sensitive flow control valve in which a valve body opens and closes by thermal deformation of a heat-sensitive element.

A heat-sensitive element is fluid-tightly partitioned from a fluid passage of the valve extending from the inlet side to the valve hole and extending to the outlet side. The present invention is characterized in that a heat pipe is provided on the second side that thermally connects the heat-sensitive element, which is different from the fluid, to the heat-sensitive element.

According to the above means, the heat-sensitive element is separated from the fluid passing through the valve and is not exposed to the fluid; Therefore, depending on the temperature, the thermal element thermally deforms and opens and closes the valve body.

<Example> A first example is shown in FIG. In the figure, this flow rate control valve 20 has an opening 22. It has a fluid passageway in which the valve hole 23 and the outlet 24 are connected in sequence. A valve body 25 for opening and closing the valve hole 23 is attached to a valve stem formed by a heat pipe 26, which extends squarely from the valve body 25 across the fluid passage to make the partition wall 29 fluid-tight and The upper end is slidably inserted into the inner hole 28a of the adjustment cylinder 28 and held there.

Inside the main body 21 above the partition wall 27 of the fluid passage is a hollow gl
It is formed. A spring receiver 32 is fixed in the middle of the heat pipe 26 in the hollow portion 31.
A return spring 30 is interposed between the partition wall 27 and the partition wall 27,
A bimetal block, which is a heat-sensitive element 29, is fitted between the spring receiver 32 and the lower end of the adjustment cylinder 28, which is a heat-sensitive element 29 in which several bimetal disks 33 are alternately inverted and stacked. These two heat-sensitive elements become bimetallic disk 33 due to temperature rise.
This is a configuration in which the degree of curvature increases and the vertical dimension in the figure increases.

The adjustment cylinder 28 penetrates the partition wall 34 of the main body 21 and is screwed together so that it can be moved up and down, and is provided with a rotation operation part 35 at its upper end exposed to the outside world.

When the fluid flowing in from the inlet 22 is at a low temperature, the flow rate regulating valve 20 moves away from the valve seat 23a of the valve hole 23 and enters the IW valve state, and maintains this state. When the temperature of the inflowing fluid reaches a high temperature, the heat pipe 26 of the valve stem, which supports the valve body 25, becomes extremely heated.
The heat is transmitted to the heat-sensitive element 29 via the heat bulb 26, increasing the upper F direction dimension of the two heat-sensitive elements in accordance with the temperature, and thereby the spring receiver 32 receives an F lowering force, causing the spring to return. 3o is compressed to move the valve body 25 in the valve closing direction. When the temperature exceeds a predetermined temperature, the downward pressing force of the heat sensitive element 29 completely overcomes the acting force of the return spring 30, causing the valve body 25 to descend and close the valve hole 23. When the temperature of the fluid in the valve 20 decreases, the temperature of the two heat-sensitive elements also decreases and the vertical dimension decreases, so the valve body 25 rises due to the action of the return spring 30 and the valve hole 23 opens. The temperature at which this valve 20 opens and closes can be adjusted by rotating the regulating cylinder 28.

A second embodiment is shown in FIG. This flow rate control valve 4° is opened and closed based on a temperature change of a second fluid different from the fluid whose flow rate is controlled by the valve 40. In the figure, main body 4
Population 42 at the bottom of 1. The valve hole 43 and the outlet 44 are connected in sequence and form a fluid passage whose flow rate is controlled. A valve body 45 for opening and closing the valve hole 43 is attached to a valve stem 46, and the valve stem 46 extends squarely from the valve body 45 and slidably penetrates the partition wall 47 in a fluid-tight manner. The upper end reaches into the hollow vA 48 and is coupled to a heat sensitive element 49.

The heat sensitive element 49 is a partition wall 4 of the fluid passage to be controlled.
It is housed in a hollow part 48 formed in the upper body 41 of the bellows 5o, and a well-known heat-sensitive fluid (wax, ether, etc.) is sealed in the bellows 5o. This configuration is such that the vertical dimension of the bellows 50 increases as the fluid expands. This heat-sensitive element 49 has an upper end fixed to the upper wall 51 and a lower end connected to the valve stem 46, and opens and closes the valve body 45 by thermal deformation.

A passage 52 for the second fluid is provided in the soil end of the main body 4], and a hild pipe 53 and soil wall 51 are provided to thermally connect the inside of the passage 52 and the interior of the bellows 50. It is provided through it. Since heat moves from the high temperature side to the low temperature side, the temperature of the heat sensitive element 49 will always be brought close to matching the temperature of the second fluid passing through the passage 52 via the heat pipe 53.

In this flow control valve 40, the valve body 45 moves in the valve closing direction as the temperature of the second fluid flowing through the passage 52 increases, and moves in the valve opening direction as the temperature of the second fluid decreases.

The flow control valve 40 of the second embodiment is used, for example, when heating a heavy oil tank or a transport pipe with steam.

It is possible to maintain the single-fuel oil at an appropriate temperature by adjusting the steam j'.

The heat-sensitive element used in the flow control valve of this invention includes:
In addition to those in the above embodiments, a known diaphragm type, piston type, or the like may be used.

<Effects of the Invention> According to the present invention, since the heat-sensitive element is not exposed to fluid, the effect that rust or corrosion does not occur can be obtained.

Also, heat-sensitive elements such as bellows type, diaphragm type, and piston type? Even before use, it does not receive the pressure of the fluid to be controlled, so it has the effect of operating according to the settings.

[Brief explanation of drawings]

FIG. 1 is a schematic longitudinal sectional side view showing a first embodiment of the present invention;
FIG. 2 is a schematic longitudinal sectional side view showing a second embodiment of the invention;
FIG. 3 is a longitudinal sectional side view showing an example of a conventional heat-sensitive flow control valve. 20...Flow control valve, 21...Body, 22...Inlet, 23...Valve hole, 24...Outlet, 25...Valve body,
26... Heat pipe, 2゛7... Partition wall, 29.
・Heat-sensitive element, 30... Return spring, 31... Hollow part,
32... Spring holder, 33... Bimetal disc.

Claims (1)

[Claims] (1) In a heat-sensitive flow control valve in which a valve body that opens and closes a valve hole between an inlet side and an outlet side of fluid is connected to a heat-sensitive element so as to be opened and closed by thermal deformation of the heat-sensitive element, the inlet The heat-sensitive element is fluid-tightly partitioned from a fluid passage extending from the side through the valve hole to the outlet side, and the temperature of the fluid in the fluid passage or the temperature related to the flow rate control of the fluid passing through the fluid passage is provided. A heat-sensitive flow rate control valve characterized in that a heat pipe is provided to thermally connect a heat source different from the fluid to the heat-sensitive element.