JP4470457B2 - 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.

  In a conventional temperature responsive valve, an inlet, a valve chamber, and an outlet are formed by a valve casing, a valve opening is formed 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 a deformation action to open and close the valve opening.

The conventional temperature responsive valve has a problem in that foreign matter such as dust and scale in the fluid adheres to and accumulates on the inner wall of the valve port, and the valve port is gradually narrowed to reduce the discharge flow rate and eventually clog the valve port. It was.
Japanese Utility Model Publication No. 3-28225

  The problem to be solved is to provide a temperature responsive valve that can clean foreign matter adhering to the inner wall of the valve opening.

In the present invention, an inlet, a valve chamber, and an outlet are formed in a valve casing, a valve port is formed between the valve chamber and the outlet, a temperature-sensitive member and a valve body are disposed in the valve chamber, and the temperature-sensitive member is deformed. In a temperature responsive valve that opens and closes the valve port by driving the valve body, an operating rod that is located on the outlet side of the valve port and can be moved forward and backward from the outside is screwed to the valve casing. There is a cleaning part that has a slightly smaller outer diameter than that and restricts the discharge flow rate when it is displaced to the valve port side, and displaces the inside of the valve port and cleans foreign matter adhering to the inner wall of the valve port, and adheres to the inner wall of the valve port. When cleaning the foreign object, screw the operating rod and displace the cleaning part to the valve port side.When the temperature of the fluid in the valve chamber is low and the valve body opens, the discharge flow rate is reduced and the valve chamber If the temperature of the fluid decreases and the valve element does not fully open the valve opening , the valve element is further separated from the valve opening .

  The present invention restricts the discharge flow rate when the cleaning portion provided at the valve port side end of the operating rod has an outer diameter slightly smaller than the valve port diameter and is displaced toward the valve port side. Therefore, in the process of cleaning the foreign matter attached to the inner wall of the valve port, the discharge flow rate is reduced, the temperature of the fluid in the valve chamber decreases, and the valve body moves away from the valve port, so the cleaning part does not have to push the valve body away. It can be displaced in the valve opening. Therefore, the outstanding effect that a valve body is not damaged by a cleaning part is produced.

In the temperature responsive valve of the present invention, an operation rod that is located on the outlet side of the valve port and can be adjusted to advance and retreat from the outside is screwed to the valve casing, and an outer diameter slightly smaller than the valve port diameter is provided at the valve port side end of the operation rod. It has a cleaning part that restricts the discharge flow rate and displaces the inside of the valve port and cleans foreign matter adhering to the inner wall of the valve port when displaced toward the valve port side. Therefore, by operating the operating rod from the outside, the cleaning part at the valve port side end of the operating rod can displace the inside of the valve port and clean the foreign matter adhering to the inner wall 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 valve port 8 is short so that foreign matter is not easily deposited, and is formed, for example, to have a length of about 1 mm from the sealing surface with the valve body 13.

  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 fits. 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.

  An operating rod 30 positioned on the outlet 2 side of the valve port 8 is screwed to the lower end of the main body 3 through an O-ring 33 so as to be adjustable. The cleaning unit 31 is fixed to the upper end of the operation rod 30 on the valve port 8 side, and the brush 32 whose upper end protrudes outward from the cleaning unit 31 is fixed to the upper end of the cleaning unit 31. The cleaning unit 31 has an outer diameter slightly smaller than the diameter of the valve port 8, and when displaced toward the valve port 8, the discharge flow rate of the valve port 8 is reduced and the inside of the valve port 8 is displaced to displace the inner wall of the valve port 8. Clean any foreign matter adhering to the surface. The brush 32 cleans foreign matter adhering to the back wall 14 of the valve body fitting hole 7.

  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. Accordingly, 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. Moreover, when cleaning the foreign material adhering to the inner wall of the valve port 8, the operating rod 30 is screwed in and the cleaning part 31 is displaced to the valve port 8 side. When the cleaning part 31 is displaced to the valve port 8 side, when the temperature of the fluid in the valve chamber 5 is low and the valve body 13 opens the valve port 8, the discharge flow rate is reduced and the temperature of the fluid in the valve chamber 5 decreases. If the valve body 13 does not fully open the valve port 8, the valve body 13 further moves away from the valve port 8. When the cleaning rod 30 is further screwed in, the cleaning part 31 and the brush 32 displace inside the valve port 8 to clean the foreign matter adhering to the inner wall of the valve port 8, and the brush 32 is attached to the inner wall 33 of the valve body fitting hole 7. Clean any foreign matter that has adhered. When the temperature of the fluid in the valve chamber 5 is high and the valve body 13 closes the valve port 8, the cleaning unit 31 and the brush 32 are moved to the valve port 8 while pushing the valve body 13 away after the brush 32 contacts the valve body 13. The foreign matter adhering to the inner wall of the valve port 8 is displaced by cleaning the foreign matter adhering to the inner wall 33 of the valve body fitting hole 7.

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 Operation rod 31 Cleaning part

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet. A valve opening is formed between the valve chamber and the outlet. A temperature-sensitive member and a valve body are arranged in the valve chamber. The valve body is driven by the deformation action of the temperature-sensitive member. In order to open and close the valve port, an operating rod that is located on the outlet side of the valve port and can be adjusted to advance and retreat from the outside is screwed to the valve casing, and the end of the operating rod on the valve port side is slightly smaller than the diameter of the valve port. When cleaning the foreign matter attached to the inner wall of the valve port by providing a cleaning part that throttles the discharge flow rate and displaces the inside of the valve port and cleans the foreign matter attached to the inner wall of the valve port when it has a diameter and is displaced toward the valve port side, When the operating rod is screwed in and the cleaning part is displaced to the valve port side, when the valve chamber fluid temperature is low and the valve body opens the valve port, the discharge flow rate is reduced and the valve chamber fluid temperature decreases. A temperature responsive valve characterized in that the valve body further moves away from the valve opening unless the valve opening is fully opened .

Images