JPS63259283A - Temperature control valve - Google Patents

Abstract

PURPOSE:To lengthen a life of a temperature control valve, by setting a pressure balance spring, a moving member moved by received pressure, a moving element moved by heat, an intermediate member and a return spring, one upon another, between the lower end face of a control rod and the bottom wall of a valve chamber. CONSTITUTION:A pressure balance spring 25 is set between the lower end face of a control rod 18 and a piston 24, and a connecting rod inserting hole 26 is formed in the piston 24, for inserting the upper end part of a connecting rod 16 in it. A snap ring 27 is attached on the center part of the connecting rod 16, and a bimetal laminated body 28 is set between the lower end face of the piston 24 and the upper end face of the snap ring 27. An intermediate member 31 is set on the lower end face of the snap ring 27, and a return spring 32 is set between the lower end face of the intermediate member 31 and the bottom wall of a valve chamber 4. In this way, as the bimetal laminated body 28 can extend as compressing the pressure balance spring 25 moreover. after the valve is closed, the abnormal increment of the inner stress of the bimetal laminated body 28 can be prevented, the deterioration of performance is prevented, and consequently, a life of the temperature control valve can be lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a valve by stretching a thermoresponsive element, which does not have a self-resetting ability, such as one made of thermowax or a plurality of bimetallic plates stacked against a return spring. The present invention relates to a temperature control valve that automatically discharges fluid at a predetermined temperature or lower from a steam system by closing the valve, and particularly relates to a means for maintaining the discharge temperature constant even if the pressure of the steam system fluctuates.

INDUSTRIAL APPLICABILITY The present invention is utilized in the field of flow rate control based on fluid temperature, particularly in the field of control for automatically discharging fluid below a predetermined temperature from a steam system to the outside of the system.

Conventional thermo-responsive elements made of thermowax or bimetallic plates do not have self-resetting ability, and therefore require a return spring. One basic structure of a temperature control valve using such a thermally responsive element is to stack the thermally responsive element, an intermediate member, and a return spring in sequence, and place both ends against the immovable wall of the valve casing. This is a combination of valve bodies.

An example of this is shown in Japanese Utility Model Publication No. 53-13948. That is, a valve seat member forming a valve opening is fixed to the bottom wall of the valve chamber, and an adjusting rod having a connecting hole 1 is screwed to the ceiling wall of the valve chamber.

Here, the valve port and the connecting rod fitting hole are arranged on the same axis. The upper end of the connecting rod is displaceably fitted into the connecting rod fitting hole, and the lower end is fitted into a hole formed in the intermediate member. A thermally responsive element is arranged around the connecting rod. The thermally-responsive element is made up of a plurality of bimetallic plates stacked one on top of the other, and its upper end surface contacts the inner end of the adjustment rod that is covered by the immovable wall of the valve casing, and its lower end surface contacts the upper end surface of the intermediate member. A return spring is interposed between the intermediate member and the bottom wall of the valve chamber. A valve body is coupled to the intermediate member.

When the temperature of the surrounding fluid increases, the thermally responsive element expands while compressing the return spring via the intermediate member. In response to this, the valve body coupled to the intermediate member is displaced, hits the valve seat, and closes the valve port. When the temperature of the surrounding fluid decreases, the expansion force of the thermally responsive element weakens, so that the thermally responsive element is pushed back by the return spring via the intermediate member.

In response to this, the valve body moves away from the valve seat and opens the valve port.

Problems to be Solved by the Invention In this case, there is a problem in that when the pressure of the steam system changes, the discharge temperature changes. In other words, when the pressure of the fluid flowing into the valve chamber increases, the pressure difference before and after the valve port increases, the discharge temperature decreases, and the pressure becomes X.
Discharge temperature increases. In particular, the discharge temperature should be set at 3 to 30% higher than the saturation temperature.
If the temperature is set to 4 degrees lower and used as a steam trap, condensate will stagnate and steam will be blown out, making it impossible to perform its function.

Means for Solving the Problems The technical means of the present invention taken to solve the above problems is to form an inlet, a valve chamber, and an outlet in a valve casing, and to provide a valve opening that communicates the valve chamber and the outlet. The formed valve seat member is fixed to the bottom wall of the valve chamber, an adjustment rod is screwed to the ceiling wall of the valve chamber on the same axis as the valve opening, and a valve body for opening and closing the valve opening is installed in the valve chamber either integrally or separately. In a temperature control valve with a connecting rod formed in the body, a pressure balance spring, a pressure responsive member, a thermally responsive element, an intermediate member, and a return spring are installed between the lower end surface of the regulating rod and the bottom wall of the valve chamber. The connecting rod fitting holes are formed in the pressure-receiving member, and the upper ends of the connecting rods are displaceably fitted into the connecting rod fitting holes.

action The operation of the above technical means is as follows.

The thermally responsive element expands while compressing the return spring in response to the temperature of the surrounding fluid. Accordingly, the intermediate member and the connecting rod formed integrally with the valve body or separately are displaced toward the valve opening, and the valve body hits the valve seat and closes the valve opening. The pressure responsive member is displaced to a position balanced with the biasing force of the pressure balance spring, depending on the pressure of the fluid flowing into the valve chamber. That is, as the pressure increases, the pressure balance spring is compressed and is displaced further upwardly, and as the pressure decreases, it is displaced further downwardly.

Therefore, as the pressure increases, the amount of reflux of the thermally responsive element until the valve closes increases, and as the pressure decreases, the amount of lift decreases. By designing the elastic force of the pressure balance spring within a range where the fluid pressure and saturation temperature have a nearly linear relationship, the discharge temperature can be kept approximately constant even if pressure fluctuations occur.

Effect of the invention The present invention produces the following unique effects.

Even after the valve is closed, the thermally responsive element can be expanded by further compressing the pressure balance spring, which prevents an abnormal increase in the internal stress of the thermally responsive element, prevents performance deterioration, and extends its life.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

A cylinder member 2 is screwed to the main body 1, and a lid 3 is screwed to the cylinder member 2 to form a valve casing having a valve chamber 4 therein. Gaskets 5 and 6 are interposed between the main body 1 and the cylinder member 2, and between the cylinder member 2 and the lid 3 to maintain airtightness. A hero passes through a through hole 8 in the valve chamber 4, and an outlet 9 communicates with the through hole 10 through a valve port 11 and a through hole 12. Through hole 1
0 and the valve port 11 are formed on a valve seat member 13 screwed to the main body 1. A gasket 14 is provided between the main body 1 and the valve seat member 13.
maintain confidentiality through intervention.

A screen 15 is arranged to regulate the flow direction of the fluid flowing into the valve chamber 4 from the lower part and to trap foreign matter in the fluid.

A connecting rod 16 is arranged opposite the valve port 11. Connecting rod 16
A valve body 17 is integrally formed at the lower end of the valve body. A lock nut 20 is attached to the adjustment rod 18 part so that it can be adjusted forward and backward in M3 to prevent loosening, and it is covered with a locking knob 21.

A piston 24 is disposed within the valve chamber 4 and slides on the inner peripheral surface of the cylinder member 2, with piston rings 22, 23 interposed on the outer periphery. A pressure balance spring 25 is disposed between the lower end surface of the adjustment rod 18 and the piston 24. The piston 24 has a valve port 1
A connecting rod fitting hole 26 is formed on the same axis as the connecting rod 16, and the upper end of the connecting rod 16 is fitted in the connecting rod 16 in a movable manner.

A snap ring 27 is attached to the center of the connecting rod 16. A bimetal laminate 28 is arranged around the connecting rod 16 and between the lower end surface of the piston 24 and the lower end surface of the snap ring 27 . The bimetal laminate 28 is the bimetal disk 2
A pair of two pieces of 9 are combined with different curved directions, and a plurality of pairs are stacked. A scrubber 30 is interposed between each bimetal pair. An intermediate member 31 is arranged on the lower end surface of the snap ring 27. A return spring 32 is disposed between the lower end surface of the intermediate member 31 and the bottom wall of the valve chamber 3.

Fluid enters the valve chamber 4 from the hero through the through hole 8 and the screen 15, flows around the bimetallic laminate 28, and exits through the through hole 12 through the through hole 10 and the valve port 11 to the outlet 9. The piston 24 is displaced to a position where the pressure of the fluid flowing into the valve chamber 4 and the elastic force of the pressure balance spring 25 are balanced. When the bimetal stack 28 is heated to a high temperature due to an increase in the temperature of the surrounding fluid, each bimetal disc 29
is curved to a greater degree, so it expands in the stacking direction while compressing the return spring 32 via the intermediate member 31. Accordingly, the intermediate member 31 and the connecting rod 16 are connected to the valve port 11.
direction, the opening degree of the valve port 11 gradually decreases, and finally the valve body 17 closes the valve port 11. This valve closed state is shown in FIG. 1'.

Even after the valve is closed, for example, if higher temperature fluid flows in due to fluid leakage, the temperature of the valve chamber 4 will further rise. Then, the bimetal laminate 28 further expands while compressing the pressure balance spring 25.

When the temperature of the fluid in the valve chamber 4 decreases, the bimetal laminate 2
8 is pushed back via the intermediate member 31 by the return spring 32 because the bending force becomes smaller. Along with this, the intermediate member 3
1 and the connecting rod 16 are displaced in the direction away from the valve port 11,
The valve port 11 is opened and the fluid in the valve chamber 4 flows out to the outlet 9 again.

When the pressure of the fluid flowing into the valve chamber 4 increases, the piston 24 is displaced further upward, increasing the amount of lift of the bimetal laminate 28 until the valve closes, and when the pressure decreases, the amount of lift is decreased. The pressure balance spring is designed so that the amount of deformation due to fluid pressure changes linearly with the saturation temperature, so even if pressure fluctuations occur, fluid below the set temperature can be automatically discharged.

The set temperature can be adjusted by moving the adjustment rod 18 forward and backward. That is, if the adjusting rod 18 is screwed in, the set temperature (temperature of the fluid to be discharged) will be lowered, and if it is screwed up, the set temperature will be raised.

In the above embodiment, a piston was used as the pressure-responsive member, but a bellows or the like may also be used.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the temperature control valve of the present invention. 1: Main body 2 Niji cylinder member 3: Lid
4: Valve chamber 7: Inlet 9: Outlet 11: Valve port 13: Valve seat member 16: Connecting rod 17: Valve body 18: Adjusting rod 24: Piston 25: Pressure balance spring 26: Connecting rod fitting hole 28: Bimetal lamination Body 31: Intermediate member 32: Return spring

Claims (1)

[Claims] 1. The valve casing forms an inlet, a valve chamber, and an outlet, and a valve seat member with a valve port that communicates the valve chamber and outlet is fixed to the bottom wall of the valve chamber, and the valve seat member is fixed to the bottom wall of the valve chamber on the same axis as the valve port. In a temperature control valve in which a control rod is screwed to the ceiling wall and a connecting rod with a valve body integrally or separately formed for opening and closing the valve port is arranged in the valve chamber,
A pressure balance spring, a pressure-responsive member, a thermally-responsive element, an intermediate member, and a return spring are arranged one on top of the other in this order between the lower end surface of the adjustment rod and the bottom wall of the valve chamber, and a connecting rod fitting hole is formed in the pressure-responsive member. A temperature control valve in which the upper end of the connecting rod is movably fitted into the connecting rod fitting hole.