JP4692982B2 - Temperature-responsive valve - Google Patents

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 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. The other end of the valve shaft, which is screwed to the casing and integrated with the valve body that opens and closes the valve port on one end, is slidably fitted in the valve shaft fitting hole and placed around the valve shaft. A temperature member is disposed, and the valve shaft is displaced in the axial direction by the deformation action of the temperature sensitive member, and the valve port 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.

According to the present invention, a valve casing forms an inlet, a valve chamber, and an outlet, and a valve body fitting hole that communicates between the valve chamber and the outlet between the valve chamber and the outlet, and a valve opening having a smaller diameter than the valve body fitting hole. Provided with an adjustment rod having a valve shaft fitting hole screwed to the valve casing, and a conical valve body integrally opening and closing the valve port on one end side is provided as the valve shaft fitting hole on the other end side of the valve shaft. in those displaced freely fitted by placing the temperature-sensitive member disposed around the valve axis, with a valve shaft in deforming action of the temperature-sensitive member is displaced in the axial direction to open and close the valve port in the valve body, the valve In the closed state where the body closes the valve port, the lower part of the valve body is positioned below the lower end of the valve port, and a space is formed between the upper part of the valve body and the lower side surface or bottom surface of the valve body fitting hole. the valve shaft so as to rotate with the rotation of the control rod connected to the control rod, scrape foreign matter adhering to the valve port by rotating the valve body by rotation of the control rod in the valve body that And features.

  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.

  In the temperature responsive valve of the present invention, the valve shaft is connected to the adjusting rod so as to rotate in accordance with the rotation of the adjusting rod, and the valve body is rotated by the rotation of the adjusting rod, and foreign matter adhering to the valve port is scraped by the valve body. It is something to drop. That is, by rotating the adjustment rod and rotating the valve shaft, the valve body provided integrally with the valve shaft is rotated, and foreign matter adhering to the valve opening 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 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. A quadrangular portion having a quadrangular section is integrally provided above the valve body 13 of the valve shaft 12 so as to be displaceably fitted in the valve body fitting hole 7. The rectangular portion allows the fluid in the valve chamber 5 to pass to the valve port 8 side. The valve port 8 is short so that foreign matter is not easily deposited, and is formed to have a length of about 1 mm from the sealing surface with the valve body 13, for example. As shown in FIG. 1, when the valve body 13 is closed with the valve port 8 closed, the lower part of the conical valve body 13 penetrates the valve port 8 and is positioned below the lower end of the valve port 8 and is conical. A space is formed between the upper portion of the valve body 13 and the lower side surface or bottom surface of the valve body fitting hole.

  The upper end of the valve shaft 12 is movably fitted in a valve shaft fitting hole 18 of an adjustment rod 17 screwed to the lid 4 via an airtight 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. The adjusting rod 17 has a vertical cut 22, and a connecting rod 23 that penetrates and is fixed to the upper part of the valve shaft 12 is fitted into the cut. As a result, the valve shaft 12 rotates as the adjustment rod 17 rotates. In order to rotate the valve shaft 12 in accordance with the rotation of the adjusting rod 17 without using the slit 22 and the connecting rod 23, the peripheral wall section of the valve shaft fitting hole 18 is formed into a non-true circle such as a polygon or an ellipse. The section of the valve shaft 12 that is fitted into the valve shaft fitting hole 18 may be formed into a non-circular shape such as a polygon or an ellipse. A flange 24 is formed integrally with the central portion of the valve shaft 12. A spring receiver 25 having a central hole provided below the flange 24 is fitted with the central hole being brought into contact with the lower end surface of the flange 24 of the valve shaft 12. A bimetal laminate 26 as a temperature sensitive member is disposed around the valve shaft 12 between the lower end surface of the adjusting rod 17 and the flange 24. 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. A return spring 27 is disposed between the spring receiver 25 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 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. 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 27 is compressed via the flange 24 and the spring receiver 25. While extending in the stacking direction. Along with this, the valve shaft 12 and the spring receiver 25 are displaced in the direction of the valve port 8, the valve body 13 gradually approaches the valve port 8, and the opening degree of the valve port 8 becomes smaller. Close 8 When 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 27 via the spring receiver 25 and the flange 24. Accordingly, the spring receiver 25 and the valve shaft 12 are displaced in a direction away from the valve port 8, the valve body 13 is separated 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. The

  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, the adjustment rod 17 is screwed and the valve shaft 12 is rotated, whereby the valve body 13 provided integrally with the valve shaft 12 is rotated, 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

1 Inlet 2 Outlet 3 Main Body 4 Lid 5 Valve Chamber 8 Valve Port 10 Valve Seat Member 12 Valve Shaft 13 Valve Body 17 Adjustment Rod 18 Valve Shaft Fitting Hole 22 Split 23 Connecting Rod 24 Hook 25 Spring Bearing 26 Bimetal Laminate 27 Return Spring

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet. A valve body fitting hole that communicates between the valve chamber and the outlet is provided between the valve chamber and the outlet, and a valve port having a smaller diameter than the valve body fitting hole is provided. An adjustment rod having a fitting hole is screwed to the valve casing, and the other end of the valve shaft, which is integrally provided with a conical valve body that opens and closes the valve port on one end, is movably fitted into the valve shaft fitting hole. In the case where 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. When the valve is closed, the lower part of the valve body is positioned below the lower end of the valve port, and a space is formed between the upper part of the valve body and the lower side surface or bottom surface of the valve body fitting hole . The valve shaft is connected to the adjusting rod so that it rotates with rotation, and the valve body is rotated by the rotation of the adjusting rod, and foreign matter adhering to the valve port is scraped off by the valve body. Temperature responsive valve.

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