JP4793774B2 - 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. A valve body that is screw-coupled to the casing and that connects a valve body that opens and closes a valve port to one end side via a valve holder is disposed so that the other end side of the valve shaft is displaceably fitted to the valve shaft fitting hole. A temperature-sensitive member is disposed around the valve body, and 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 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 Utility Model Publication No. 61-20399

  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, screw connection to the control rod having a valve shaft fitting hole in the valve housing, the upper end side of the valve shaft connected via a valve holder with valve body having a conical sealing portion for opening and closing the valve port to the lower end The valve shaft is fitted in a freely displaceable manner in the valve shaft fitting hole, a temperature-sensitive member is arranged 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 port is opened by the valve body. In a temperature responsive valve that opens and closes, the lower part of the conical seal portion of the valve body is positioned below the lower end of the valve body in a closed state where the valve body closes the valve port, and the conical seal portion of the valve body a space is formed between the lower side surface to the bottom surface of the upper and the valve body fitting hole, a valve in the control rod to the valve stem so that the valve body with the rotation of the control rod is rotated Hol The valve body to the valve shaft and connected to the valve holder, rotating the valve body by rotation of the control rod, characterized in that scraping off foreign matter adhering to the valve port and a conical shaped sealing portion of the valve body.

In the present invention, the foreign matter adhering to the valve port is scraped off by the conical seal portion of the valve body, so that no foreign matter accumulates on the valve port that is opened and closed by the valve body. An excellent effect that it will not occur is produced.

In the temperature responsive valve of the present invention, the valve body is connected to the adjustment rod, the valve holder is connected to the valve shaft, and the valve body is connected to the valve holder so that the valve body rotates with the rotation of the adjustment rod. The foreign matter adhering to the valve opening is scraped off by the conical seal portion of the valve body. In other words, by rotating the adjusting rod to rotate the valve shaft, the valve holder, and the valve body, foreign matter adhering to the valve port is scraped off by the conical seal portion of the valve body. For this reason, foreign matter does not accumulate on the valve opening that is opened and closed by the valve body.

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 above the valve port 8. The valve holder 13 is connected to the lower end of the valve shaft 12 by screwing. Thereby, the valve holder 13 rotates with the rotation of the valve shaft 12. The valve shaft 12 and the valve holder 13 may be fixedly connected by welding or the like. Further, the lower end of the valve shaft 12 is formed in a non-perfect circle such as a polygon or an ellipse, and the inner peripheral wall section of the valve holder 13 to which the lower end of the valve shaft 12 is fitted is a non-polygon or an ellipse. You may form and connect in a perfect circle. A valve body 14 for opening and closing the valve port 8 is connected to the valve holder 13. The valve body 14 has a top portion having a non-circular shape such as a polygon or an ellipse at the upper end, a conical seal portion at the lower end, and an intermediate portion having a square cross section in the middle. The top of the valve body 14 is located inside the valve holder 13, and the middle part of the valve body 14 projects downward from the stepped hole of the valve holder 13. A cross section of the inner peripheral wall of the valve holder 13 where the top of the valve body 14 is located is formed into a non-true circle such as a polygon or an ellipse. Thereby, the valve body 14 rotates with the rotation of the valve holder 13. The valve holder 13 may be provided with a vertical cut, and a connecting rod may be passed through and fixed to the top of the valve body 14, and the connecting rod may be fitted and connected to the cut of the valve holder 13. An intermediate spring 15 is disposed between the lower end of the valve shaft 12 and the top of the valve body 14. The intermediate spring 15 is arranged by being compressed, arranged with a free length, or provided with a gap between the lower end of the valve shaft 12. The intermediate part of the valve body 14 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 accumulated, and is formed to have a length of about 1 mm from the sealing surface with the valve body 14, for example. As shown in FIG. 1, when the valve body 14 is closed with the valve port 8 closed, the lower part of the conical seal portion of the valve body 14 passes through the valve port 8 and is positioned below the lower end of the valve port 8. In addition, a space is formed between the upper portion of the conical seal portion of the valve body 14 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. The cross section of the peripheral wall of the valve shaft fitting hole 18 is formed into a non-perfect circle such as a polygon or an ellipse, and the cross section of the portion of the valve shaft 12 that fits into the valve shaft fitting hole 18 is a non-polygon or an ellipse. You may form and connect in a perfect circle. A bimetallic 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 portion 24 of the valve shaft 12. 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 valve holder 13 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 valve holder 13. While extending in the stacking direction. Along with this, the valve shaft 12 and the valve holder 13 are displaced in the direction of the valve port 8, the valve body 14 gradually approaches the valve port 8, and the opening degree of the valve port 8 becomes smaller. Close 8 If the temperature of the fluid in the valve chamber 5 decreases, the bending force of the bimetal laminate 26 decreases, and the bimetallic laminate 26 is pushed back by the return spring 27 via the valve holder 13 and the flange 24. Accordingly, the valve holder 13 and the valve shaft 12 are displaced away from the valve port 8, the valve body 14 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 to rotate the valve shaft 12, the valve holder 13, and the valve body 14, thereby scraping off the foreign matter adhering to the valve port 8 with the valve body 14.

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 Holder 14 Valve Body 17 Adjusting Rod 18 Valve Shaft Fitting Hole 22 Split 23 Connecting Rod 24 Gutter 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. screw connection with a control rod having a fitting hole in the valve housing, a valve shaft fitted on the end side of the valve shaft connected via a valve holder with valve body having a conical sealing portion for opening and closing the valve port to the lower end Displaceably fitted in the hole, arranged with a temperature sensing member around the valve shaft, and the valve body 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 When the valve body is closed with the valve port closed, the lower part of the conical seal portion of the valve body is positioned below the lower end of the valve port and the upper part of the conical seal portion of the valve body is fitted to the valve body a space is formed between the lower side surface to the bottom surface of the hole, the valve element to the valve shaft of the valve holder control rod to the valve stem so that the valve body with the rotation of the control rod is rotated Connected to the holder, control rod temperature responsive valve which rotates the valve body, characterized in that scraping off foreign matter adhering to the valve port and a conical shaped sealing portion of the valve body by rotation of the.

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