JP2005226757A - Temperature responsive valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature responsive valve capable of preventing foreign matter from depositing on the valve port thereof. <P>SOLUTION: A valve casing having a valve chamber 5 therein is formed by threadedly connecting a cover 4 to a body 3 having an inlet 1 and an outlet 2. A valve port 8 communicating the valve chamber 5 with the outlet 2 is formed between the valve chamber 5 and the outlet 2. A valve stem 12 formed by integrally fitting, at one end, a valve element 13 opening/closing the valve port 8 is disposed in the valve chamber 5, a bi-metal laminated body 28 as a temperature sensing member is disposed around the valve stem 12, and a connection part 19 is fitted to the other end of the valve stem 12. An operation member 20 connectable/disconnectable from the outside and rotatingly operating the valve stem 12 is fitted to the connection part 19 of the valve stem 12, and the valve element 13 is rotated by the rotation of the valve stem 12 by the operation member 20 to scrape off the foreign matter depositing on the valve port 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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 at or below a predetermined temperature out of the system or mixing a plurality of fluids into a fluid at a predetermined temperature. It is suitable when used as a temperature control trap that is discharged automatically.

  A conventional temperature responsive valve has an inlet, a valve chamber, and an outlet formed by a valve casing, a valve port that communicates between the valve chamber and the outlet is provided between the valve chamber and the outlet, and an adjustment rod having a valve shaft fitting hole is provided as a valve. A valve body that is screwed to the casing and provided with a valve body that opens and closes the valve port on one end side is disposed with the other end side of the valve shaft movably fitted in the valve shaft fitting hole. The valve shaft is displaced in the axial direction by the deformation action of the temperature sensing member, and the valve opening is opened and closed by the valve body.

In the above conventional temperature responsive valve, when foreign matter such as dust or scale in the fluid adheres to the sealing surface of the valve port that opens and closes when the valve element is seated, the valve body is in the fully closed position where the valve port is completely sealed. There was a problem that the valve could not be displaced and foreign matter gradually accumulated on the valve opening, and the valve opening was gradually narrowed to reduce the discharge flow rate, and the valve opening was clogged.
Japanese Patent No. 2709533

  The problem to be solved is to provide a temperature responsive valve in which foreign matter does not accumulate in the valve port.

  The present invention provides a valve casing in which an inlet, a valve chamber, and an outlet are formed, a valve port that communicates between the valve chamber and the outlet is provided between the valve chamber and the outlet, and a valve body that opens and closes the valve port is provided on one end side. The shaft is arranged in the valve chamber, a temperature sensing member is arranged around the valve shaft, the valve shaft is displaced in the axial direction by the deformation action of the temperature sensing member, and the valve port is opened and closed by the valve body. A connecting part is provided on the other end side, an operating member that can be connected / released from the outside and operated to rotate the valve shaft is provided at the connecting part of the valve shaft, and the valve body is rotated by the rotation of the valve shaft by the operating member to It is characterized by scraping off adhering foreign matter with a valve body.

  According to the present invention, the foreign matter adhering to the valve opening is scraped off by the valve body, so that the foreign matter does not accumulate on the valve opening, so that an excellent effect is obtained that the discharge flow rate is not reduced and the valve opening is not clogged.

  The temperature responsive valve of the present invention is provided with a connecting portion on the other end side of the valve shaft, and provided with an operating member that can be connected / released from the outside to the connecting portion of the valve shaft to rotate the valve shaft. The valve body is rotated by the rotation, and foreign matter adhering to the valve port is scraped off by the valve body. Therefore, no foreign matter accumulates on the valve opening.

  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. The valve port 8 is formed to have a smaller diameter than the valve body fitting hole 7. 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 arranged 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. A blade 15 having a two-surface width that is movably fitted in the valve body fitting hole 7 is integrally provided above the valve body 13 of the valve shaft 12. The blade 15 having a two-sided width allows the fluid in the valve chamber 5 to pass to the valve port 8 side, and removes foreign matter adhering to the back wall 14 of the valve body fitting hole 7 where the valve port 8 opens at the lower end.

  The upper end side of the valve shaft 12 is movably fitted in the valve shaft fitting hole 18 of the adjusting rod 17 screwed to the lid 4 via an airtight O-ring 16 so as to be able to advance and retreat, and the upper end surface thereof is cut off. A connecting portion 19 is provided. An operation member 20 is disposed on the upper wall of the adjustment rod 17 via an O-ring 21 so as to be able to advance and retract. At the lower end of the operation member 20, a connecting portion 22 formed of a one-character projection that can be connected to and released from the connecting portion 19 of the valve shaft 12 is provided. A slit 23 in which the tip of a tool such as a screwdriver fits is provided at the upper end of the operation member 20 so that the operation member 20 can be rotated from the outside. By rotating the operating member 20 and rotating the valve shaft 12, the valve body 13 is rotated, and the foreign matter adhering to the valve port 8 is scraped off by the valve body 13. The valve body fitting hole 7, the valve port 8, and the valve shaft fitting hole 18 are formed on the same shaft. The upper portion of the adjusting rod 17 protrudes from the lid 4, and a lock nut 24 is attached to the protruding portion to prevent loosening and is covered with a cap 25. A spring receiver 26 is fixed to the central portion of the valve shaft 12, an intermediate member 27 having a substantially U-shaped cross section and having a central hole and a flange on the outside of the upper end, and a spring receiver 26, 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 28 and a flat washer 29 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 27. The bimetal laminate 28 is a pair of two bimetal discs that are combined by changing the bending direction, and a plurality of the bimetal discs are stacked. Between the upper end surface of the spring receiver 26 and the lower end surface of the flat washer 29, a valve body biasing spring 30 that biases the spring receiver 26 toward the valve port 8 is disposed. A return spring 31 is disposed between the flange of the intermediate member 27 and the bottom wall of the valve chamber 5.

  The fluid enters the valve chamber 5 from the inlet 1 through the through hole 6, flows around the bimetal laminate 28, and flows out from the valve body fitting hole 7 and the valve port 8 through the through hole 9 to the outlet 2. When the temperature of the surrounding fluid rises and the bimetal laminate 28 is heated to a high temperature, each bimetal disk is bent and the degree thereof increases, and the return spring 31 is compressed via the plain washer 29 and the intermediate member 27. While extending in the stacking direction. Along with this, the intermediate member 27 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 28 further expands while compressing the return spring 31 and the valve body biasing spring 30. At this time, the intermediate member 27 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 28 decreases and is pushed back by the return spring 31 via the intermediate member 27. Along with this, the intermediate member 27 and the valve shaft 12 are displaced in a direction away from the valve port 8, the valve port 8 is opened, 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, by rotating the operating member 20 to rotate the valve shaft 12 to rotate the valve body 13, the inner wall of the valve body fitting hole 7 in which the valve port 8 opens at the lower end of the blade 15 provided on the valve shaft 12. The foreign matter adhering to 14 is scraped off, and the foreign matter adhering to the valve port 8 is scraped off by the valve body 13.

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 body 13 Valve body 14 Back wall 15 of valve body fitting hole 15 Cutting tool 17 Adjustment rod 18 Valve shaft fitting hole 19 connection part 20 operation member 22 connection part 28 bimetal laminated body

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet. A valve shaft that provides communication between the valve chamber and the outlet is provided between the valve chamber and the outlet, and a valve shaft that opens and closes the valve port is provided on one end side. The temperature sensing member is disposed around the valve shaft, and the valve shaft is displaced in the axial direction by the deformation action of the temperature sensing member to open and close the valve port with the valve body. A connecting part is provided, and an operating member that can be connected / released from the outside and operated to rotate the valve shaft is provided at the connecting part of the valve shaft. A temperature-responsive valve characterized by scraping off with a valve body.

Images