JP4133748B2 - 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 body fitting hole and a valve opening having a smaller diameter than the valve body fitting hole are provided between the valve chamber and the outlet. An adjustment rod having a fitting hole is screwed to the valve casing, and the other end of the valve shaft is provided with a valve body that is displaceably fitted to the valve body fitting hole at one end and opens and closes the valve port at the tip. Displaceably fitted into the fitting hole and placed, a temperature sensitive member is placed around the valve shaft, the valve shaft is displaced in the axial direction by the deformation action of the temperature sensitive member, and the valve opening is opened and closed by the valve body In this case, the adjustment rod is provided with a vertical cut, a connecting rod that is fitted to the cut so as to rotate with the rotation of the adjustment rod is fixed to the valve shaft, and the back of the valve body fitting hole in which the valve port opens A blade is provided at a portion of the valve shaft facing the wall.

The above-mentioned conventional temperature responsive valve uses a blade provided on the valve body to remove foreign matter adhering to the inner wall of the valve body fitting hole where the valve port opens by rotating the adjustment shaft and rotating the valve shaft. It is. However, when the valve shaft is rotated by rotating the adjustment rod, the pressing force of the valve shaft toward the valve port is relatively weak, so that the foreign matter attached to the inner wall of the valve body fitting hole cannot be reliably deleted. was there. In addition, the adjustment rod cannot be rotated after the valve body closes the valve port and the connecting rod comes into contact with the upper end of the cutting or after the upper end of the valve shaft comes into contact with the upper wall of the valve shaft fitting hole. There was a problem that foreign matter adhering to the inner wall of the body fitting hole could not be removed over the entire surface.
JP 2002-372166 A

  The problem to be solved is to make it possible to reliably remove foreign matter adhering to the inner wall of the valve body fitting hole.

  The present invention forms an inlet, a valve chamber, and an outlet in a valve casing, and provides a valve body fitting hole and a valve opening having a smaller diameter than the valve body fitting hole between the valve chamber and the outlet, The other end of the valve shaft is provided with a valve body that has a valve body that opens and closes the valve port at one end. Of the valve shaft facing the inner wall of the valve body fitting hole where the valve port opens. In a temperature-responsive valve that opens and closes the valve port with a valve body by disposing a blade at the site, disposing a temperature-sensitive member around the valve shaft, displacing the valve shaft in the axial direction by the deformation action of the temperature-sensitive member, The screw connection between the adjusting rod and the valve casing is released when the screw is screwed in more than a predetermined amount.

  The present invention releases the screw connection between the adjustment rod and the valve casing, and rotates the adjustment rod while pressing the valve shaft with a large force in the valve opening direction with the adjustment rod. An excellent effect of reliably removing the adhered foreign matter is produced.

  The temperature responsive valve of the present invention releases the screw connection between the adjusting rod and the valve casing when the adjusting rod is screwed in more than a predetermined amount. Therefore, after releasing the screw connection between the adjusting rod and the valve casing, the adjusting rod can be rotated while pressing the valve shaft with a large force in the valve opening direction with the adjusting rod. Therefore, the foreign material adhering to the inner wall of the valve body fitting hole can be reliably deleted.

  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 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 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.

  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. A male screw is not formed on the upper portion of the adjusting rod 17, and the upper portion protrudes from the lid 4, and a slit 19 is provided on the upper end surface thereof to fit the tip of a tool such as a screwdriver. The protruding portion of the adjustment rod 17 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. When the adjusting rod 17 is screwed in more than a predetermined amount, the screw connection with the lid 4 is released, the valve body 13 closes the valve port 8, and the connecting rod 23 contacts the upper end of the cut 22. The upper end of the valve shaft 12 may be brought into contact with the upper wall of the valve shaft fitting hole 18 without bringing the connecting rod 23 into contact with the upper end of the cut 22. 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 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 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, when removing foreign matter adhering to the inner wall 14 of the valve body fitting hole 7, the adjusting rod 17 is screwed more than a predetermined amount to release the screw connection with the lid 4, and the valve shaft 12 is connected to the valve port 8 with the adjusting rod 17. By rotating the adjusting rod 12 while pressing with a large force in the direction, the foreign matter attached to the back wall 14 of the valve element fitting hole 7 at the lower end of the blade 15 is deleted.

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 22 Cutting 23 Connecting rod 26 Bimetal laminate

Claims (1)

An adjustment rod having an inlet, a valve chamber, and an outlet formed by a valve casing, a valve body fitting hole between the valve chamber and the outlet, and a valve opening having a smaller diameter than the valve body fitting hole, and having a valve shaft fitting hole The other end of the valve shaft is provided with a valve body that opens and closes the valve port at the tip, and the other end of the valve shaft is displaceable into the valve shaft fitting hole. The valve shaft is connected to the adjustment rod so that it rotates with the rotation of the adjustment rod, and the blade is attached to the portion of the valve shaft facing the inner wall of the valve body fitting hole where the valve port opens. When 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 temperature responsive valve characterized in that the screw connection between the adjusting rod and the valve casing is released.

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