JP2007162888A - Temperature responsive valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature responsive valve capable of removing a foreign object jammed between a seal face of a valve port and a valve element. <P>SOLUTION: A lid 4 is screwed to a body 3 having an inlet 1 and an outlet 2, and a valve casing is formed having a valve chest 5 in an interior. The valve port 8 is formed between the valve chest 5 and the outlet 2. The valve element 13 and a bimetal laminated body 26 used as a thermosensitive member are arranged in the valve chest 5. The valve element 13 is driven by deforming action of the bimetal laminated body 26 to open and close the valve port 8. A valve member 30 is screwed to the body 3 such that reciprocating operation can be carried out from an exterior. The valve member 30 opens and closes the valve port 8 from an outlet 2 side. A slot 32 for fitting in a tip of a tool such as a driver is provided in a lower end face of a lower part protruding to an exterior of the valve member 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a temperature-responsive valve that opens and closes a valve opening by a temperature-sensitive member that is heated and cooled by a controlled fluid and deforms according to the temperature. The temperature responsive valve of the present invention is used when discharging a fluid having a predetermined temperature or lower to the outside of the system, and is particularly suitable for use as a temperature control trap for automatically discharging condensate having a predetermined temperature or lower.

  Conventional temperature responsive valves have an inlet, a valve chamber, and an outlet formed by a valve casing, a valve port that communicates the valve chamber and the outlet is provided between the valve chamber and the outlet, and a temperature-sensitive member and a valve body are disposed in the valve chamber. The valve body is driven by the deformation action of the temperature sensing member to open and close the valve chamber side of the valve port.

In the conventional temperature responsive valve, when foreign matter such as dirt or scale in the fluid is caught between the valve body and the sealing surface of the valve opening that opens and closes when the valve element is seated, the valve body opens the valve opening. There is a problem in that a fluid at a predetermined temperature or higher that should not be discharged cannot be discharged because it cannot be displaced to the fully closed position for complete sealing.
Japanese Patent No. 2709533

  The problem to be solved is to provide a temperature responsive valve capable of removing foreign matter caught between the sealing surface of the valve port and the valve body.

  In the present invention, an inlet, a valve chamber, and an outlet are formed by a valve casing, a valve port that communicates the valve chamber and the outlet is provided between the valve chamber and the outlet, and a temperature-sensitive member and a valve body are disposed in the valve chamber. A valve member that opens and closes the valve chamber from the outlet side by opening and closing from the outside by opening and closing the valve chamber side by driving the valve body by the deformation action of the temperature member is provided on the outlet side of the valve port It is characterized by.

  According to the present invention, by operating the valve member to close the outlet side of the valve port, leakage of fluid at a predetermined temperature or higher that should not be discharged is prevented, and the valve member is operated to open the outlet side of the valve port. This produces an excellent effect that foreign matter on the sealing surface of the valve port can be removed.

  The temperature responsive valve of the present invention is provided with a valve member on the outlet side of the valve port, which is opened and closed from the outside to open and close the valve port from the outlet side. For this reason, when removing foreign matter caught between the sealing surface of the valve port and the valve body, by operating the valve member from the outside and closing the outlet side of the valve port, fluid that exceeds a predetermined temperature that should not be discharged Can be prevented, and the temperature in the valve chamber can be lowered by heat radiation. Therefore, the valve element is driven by the deformation action of the temperature sensing member, and the valve chamber side of the valve opening is opened. Thereafter, by operating the valve member from the outside to open the outlet side of the valve port, fluid having a predetermined temperature or lower in the valve chamber is discharged to the outlet at once while removing foreign matter on the seal surface of the valve port.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A lid 4 is screwed to a body 3 having an inlet 1 and an outlet 2 to form a valve casing having a valve chamber 5 therein. The inlet 1 communicates with the valve chamber 5 through the through hole 6, and the outlet 2 communicates with the valve body fitting hole 7, the valve port 8, and the through hole 9. The valve body fitting hole 7 and the valve port 8 are formed in the valve seat member 10 screwed to the main body 3. A screen 11 for restricting the flow direction of the fluid flowing from the inlet 1 into the valve chamber 5 and capturing foreign substances in the fluid is disposed. A valve shaft 12 is disposed opposite to the valve port 8. A conical valve body 13 for opening and closing the valve port 8 is integrally provided at the lower end of the valve shaft 12.

  The upper end side of the valve shaft 12 is movably fitted in a valve shaft fitting hole 18 of an adjusting rod 17 screwed to the lid 4 via an O-ring 16 so as to be able to advance and retract. The valve body fitting hole 7, the valve port 8, and the valve shaft fitting hole 18 are formed on the same shaft. An upper portion of the adjustment rod 17 protrudes from the lid 4, and a slit 19 is provided on the upper end surface of the adjustment rod 17 so that the tip of a tool such as a screwdriver can be fitted. A lock nut 20 is attached to the protruding portion of the adjusting rod 17 to prevent loosening, and is covered with a cap 21. A spring receiver 24 is fixed to the central portion of the valve shaft 12, an intermediate member 25 having a substantially U-shaped cross section and a flange on the outer side of the upper end, and a spring receiver 24, which is displaceable to the valve shaft 12. Is brought into contact with the lower end surface of the mating member. Around the valve shaft 12, a bimetal laminate 26 and a flat washer 27 are disposed as a temperature sensitive member between the lower end surface of the adjusting rod 17 and the flange portion of the intermediate member 25. The bimetal laminate 26 is a pair of two bimetal disks combined with different bending directions, and a plurality of the bimetal disks are stacked. Between the upper end surface of the spring receiver 24 and the lower end surface of the flat washer 27, a valve body urging spring 28 that urges the spring receiver 24 toward the valve port 8 is disposed. A return spring 29 is disposed between the flange of the intermediate member 25 and the bottom wall of the valve chamber 5. The valve member 30 is screwed to the main body 3 via an O-ring 31 so as to be able to advance and retract from the outside. The valve member 30 penetrates the main body 3 on the same axis as the valve seat member 10 and opens and closes the valve port 8 from the outlet 2 side. A slit 32 on which a tip of a tool such as a screwdriver fits is provided on the lower end surface of the lower part protruding outside the valve member 30. A lock nut 33 is attached to the protruding portion of the valve member 30 to prevent loosening.

  The fluid enters the valve chamber 5 from the inlet 1 through the through hole 6 and the screen 11, flows around the bimetal laminate 26, and flows out from the valve body fitting hole 7 and the valve port 8 through the through hole 9 to the outlet 2. To do. When the temperature of the surrounding fluid rises and the bimetal laminate 26 is heated to a high temperature, each bimetal disk is bent and the degree thereof increases, and the return spring 29 is compressed via the plain washer 27 and the intermediate member 25. While extending in the stacking direction. Along with this, the intermediate member 25 and the valve shaft 12 are displaced in the direction of the valve port 8, the opening degree of the valve port 8 gradually decreases, and the valve body 13 closes the valve port 8 at the end. When the higher temperature fluid flows into the valve chamber 5 after the valve body 13 closes the valve port 8, the bimetal laminate 26 further expands while compressing the return spring 29 and the valve body biasing spring 28. At this time, the intermediate member 25 is displaced in the direction of the valve port 8, but the valve shaft 12 is not displaced. If the temperature of the fluid in the valve chamber 5 decreases, the bending force of the bimetal laminate 26 decreases and is pushed back by the return spring 29 via the intermediate member 25. Along with this, the intermediate member 25 and the valve shaft 12 are displaced away from the valve port 8, the valve body 13 opens the valve port 8, and the fluid in the valve chamber 5 is discharged to the outlet 2.

  When the temperature of the fluid to be discharged is changed, the cap 21 is removed and the adjusting rod 17 is rotated. If the adjusting rod 17 is screwed in, the temperature of the fluid to be discharged becomes low, and if the adjusting rod 17 is screwed up, the temperature of the fluid to be discharged becomes high. Further, when removing foreign matter caught between the sealing surface of the valve port 8 and the valve body 13, the valve member 30 is screwed to close the outlet 2 side of the valve port 8. As a result, leakage of a fluid at a predetermined temperature or higher which should not be discharged is prevented, and the temperature in the valve chamber 5 is reduced by heat radiation, so that the valve body 13 opens the valve chamber 8 side of the valve port 8. Thereafter, the valve member 30 is retracted and the outlet 2 side of the valve port 8 is opened, so that a fluid having a predetermined temperature or lower in the valve chamber 5 is discharged to the outlet 2 at once while removing foreign matter on the seal surface of the valve port 8.

Sectional drawing of the temperature responsive valve of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Main body 4 Lid 5 Valve chamber 7 Valve body fitting hole 8 Valve port 10 Valve seat member 12 Valve shaft 13 Valve body 17 Adjustment rod 18 Valve shaft fitting hole 26 Bimetal laminated body 30 Valve member

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet. A valve port that connects the valve chamber and the outlet is provided between the valve chamber and the outlet. A temperature-sensitive member and a valve body are disposed in the valve chamber. A valve member that opens and closes the valve chamber side of the valve port by actuating the valve member is provided on the outlet side of the valve port to open and close the valve port from the outlet side by advancing and retracting from the outside. Temperature responsive valve.

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