JP5269738B2 - Thermally responsive steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat responsive steam trap having no leakage of steam even when a foreign matter is bitten between the seal face of a valve member and the seal face of a valve seat member. <P>SOLUTION: A gasket 16 is provided as a seal member for providing a seal between the inner peripheral wall of a lower casing 2 and the outer periphery of a temperature control element 9. A fluid passage hole 14 is formed in the temperature control element 9 through a wall member 10, a diaphragm member 11 and the valve member 13. The seal face 19 is formed in the valve member 13 for closing a lead-out passage 8 of the valve seat member 7 upon seating of the valve member 13 on the valve seat member 7. The seal face 18 is formed in the valve seat member 7 for closing the fluid passage hole 14 of the valve member 13. A bimetal 15 is provided as a temperature responsive member deforming at a predetermined high temperature, which is higher than the expansion and contraction temperature of an expansion medium 12 and is lower than a saturation temperature, to open the fluid passage hole 14 at a temperature lower than the predetermined high temperature and close the fluid passage hole 14 at a temperature higher than the predetermined high temperature. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, a temperature controller including a medium that is heated and cooled by steam and condensate and expands and contracts according to the temperature. The present invention relates to a thermally responsive steam trap that discharges condensate at a predetermined temperature or less out of the system using element.

A conventional thermally responsive steam trap is disclosed in Patent Document 1, for example. This includes a valve casing that forms an inlet, a valve chamber, and an outlet, a valve seat member that forms a lead-out path that connects the valve chamber and the outlet, and an expansion medium sealed between the wall member and the diaphragm member, A temperature control element with a member is provided, the valve seat member is attached between the valve chamber and the outlet, the temperature control element is attached to the valve chamber with the valve member facing the valve seat member, and the expansion and contraction of the expansion medium The valve member is separated from and seated on the valve seat member due to the displacement of the diaphragm member by a sealing member provided between the inner peripheral wall of the valve casing and the outer periphery of the temperature control element, and the wall member is provided on the temperature control element. A fluid passage hole is formed through the diaphragm member and the valve member, and a sealing surface is formed on the valve member to close the lead-out path of the valve seat member when the valve member is seated on the valve seat member. Sealing seal The is obtained by forming the valve seat member.

Japanese Patent Laid-Open No. 9-004791

In the above conventional heat-responsive steam trap, if foreign matter such as dust or scale in the fluid is caught between the sealing surface of the valve member and the sealing surface of the valve seat member, the outlet passage and the fluid passage hole are completely sealed. There was a problem that the valve member could not be displaced to the fully closed position and the steam leaked out.

Therefore, the problem to be solved by the present invention is to provide a thermally responsive steam trap that does not leak steam even if foreign matter is caught between the sealing surface of the valve member and the sealing surface of the valve seat member. .

In order to solve the above problems, a thermally responsive steam trap according to the present invention includes a valve casing having an inlet, a valve chamber, and an outlet, a valve seat member having a lead-out path that communicates the valve chamber and the outlet, and a wall. A temperature control element is provided in which an expansion medium is sealed between the member and the diaphragm member, and the valve member is attached to the diaphragm member. The valve seat member is attached between the valve chamber and the outlet, and the valve member faces the valve seat member. The temperature control element is attached to the valve chamber, and the valve member is separated from the valve seat member by the displacement of the diaphragm member due to the expansion and contraction of the expansion medium, and includes an inner peripheral wall of the valve casing and an outer periphery of the temperature control element. A sealing member is provided for sealing between the two, a fluid passage hole is formed in the temperature control element through the wall member, the diaphragm member, and the valve member, and when the valve member is seated on the valve seat member, a lead-out path for the valve seat member Seal the sealing surface The valve seat member is formed with a sealing surface that closes the fluid passage hole of the valve member and is deformed at a predetermined high temperature that is higher than the expansion / contraction temperature of the expansion medium and lower than the saturation temperature. A temperature-responsive member is provided that opens the fluid passage hole when the temperature is lower than the predetermined temperature and closes the fluid passage hole when the temperature is higher than a predetermined high temperature.

According to the present invention, the fluid is deformed at a predetermined high temperature that is higher than the expansion and contraction temperature of the expansion medium and lower than the saturation temperature, and the fluid passage hole is opened when the temperature is lower than the predetermined high temperature. Since a temperature-responsive member that closes the passage hole is provided, a condensate that exceeds a predetermined temperature should not be discharged by biting foreign matter between the seal surface of the valve member and the seal surface of the valve seat member. When the temperature of the room is higher than a predetermined high temperature, which is higher than the expansion and contraction temperature of the expansion medium and lower than the saturation temperature, the temperature-responsive member closes the fluid passage hole, thereby leaking condensate and steam higher than the predetermined high temperature. The effect that can be prevented.

It is sectional drawing of the thermally responsive steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. The upper casing 1 and the lower casing 2 are screwed together to form a valve casing having a valve chamber 3 therein. The upper casing 1 is formed with an inlet 4 communicating with the valve chamber 3, and the lower casing 2 is formed with an outlet 5 communicating with the valve chamber 3. A valve seat member 7 is screwed to a partition wall 6 between the valve chamber 3 and the outlet 5. The valve seat member 7 is formed with a plurality of lead-out paths 8 that communicate the valve chamber 3 and the outlet 5. A temperature control element 9 is disposed above the valve seat member 7.

The temperature control element 9 includes a wall member 10, a diaphragm member 11, an expansion medium 12 enclosed between the members 10 and 11, and a valve member 13 attached to the valve seat member 7 side of the diaphragm member 11. A fluid passage hole 14 penetrating the member 10, the diaphragm member 11, and the valve member 13 is opened. The fluid passage hole 14 is formed by welding the diaphragm member 11 and the valve member 13 with their respective central openings aligned, and welding the edge of the central opening of the wall member 10 and the edge of the central opening of the diaphragm member 11. The expansion medium 12 is formed of a liquid having a boiling point lower than that of water, or a mixture thereof. The displacement of the diaphragm member 11 due to the expansion and contraction of the expansion medium 12 causes the valve member 13 to be separated from and seated on the valve seat member 9 to open and close the fluid passage hole 14. The fluid passage hole 14 is opened when the expansion medium 12 is deformed at a predetermined high temperature higher than the expansion temperature and lower than the saturation temperature and lower than the predetermined high temperature. The bimetal 15 as the temperature responsive member to be closed is attached to the wall member 10.

The temperature control element 9 is arranged in the valve chamber 3 with the valve member 13 facing the valve seat member 7 and mounted on a step formed on the inner peripheral wall of the lower casing 2 via a gasket 16 as a sealing means. Hold by the snap ring 17. A gasket 16 seals between the inner peripheral wall of the lower casing 2 and the outer periphery of the temperature control element 9. A seal surface 18 that closes the fluid passage hole 20 when the valve member 13 is seated on the upper surface of the valve seat member 7 is formed, and a seal that closes the outlet passage 8 when seated on the valve seat member 7 is formed on the lower surface of the valve member 13. Surface 19 is formed.

The operation of the thermally responsive steam trap of the above embodiment is as follows. When the temperature in the valve chamber 3 rises above a predetermined temperature, the expansion medium 12 expands. The expansion of the expansion medium 12 causes the diaphragm member 11 to be displaced downward, and the valve member 13 is seated on the valve seat member 7. When the valve member 13 is seated on the valve seat member 7, the seal surface 19 of the valve member 13 closes the outlet path 8 and the seal surface 18 of the valve seat member 7 closes the fluid passage hole 14. This prevents condensate above the predetermined temperature and steam leakage. When the outlet path 8 and the fluid passage hole 14 are closed, the inside of the valve chamber 3 is separated into the inlet 4 side and the outlet 5 side with the temperature control element 9 interposed therebetween. When the temperature in the valve chamber 3 falls below a predetermined temperature, the expansion medium 12 contracts and the diaphragm 11 is displaced upward. As the temperature drops, the pressure on the outlet 5 side of the valve chamber 3 also increases. Since the pressure is lowered, the force for displacing the diaphragm 11 is weak, and after the temperature in the valve chamber 3 is further lowered, the diaphragm 11 is displaced upward, and the valve member 13 is separated from the valve seat member 7, The sealing surface 19 of the member 13 opens the outlet path 8, and the sealing surface 18 of the valve seat member 7 opens the fluid passage hole 14. Thereby, condensate having a temperature lower than the predetermined temperature is discharged from the outlet 5. Condensate above a predetermined temperature that should not be discharged by biting foreign matter between the seal surface 19 of the valve member 13 and the seal surface 18 of the valve seat member 7 leaks, and the inside of the valve chamber 3 expands and contracts. When the temperature becomes higher than a predetermined high temperature, which is lower than the saturation temperature, the bimetal 15 closes the fluid passage hole 14, thereby preventing condensate and steam leaking higher than the predetermined high temperature.

INDUSTRIAL APPLICABILITY The present invention can be used for a thermally responsive steam trap that uses a temperature control element including an expansion medium to discharge condensed water having a predetermined temperature or less generated in various steam-using devices and steam pipes to the outside of the system.

DESCRIPTION OF SYMBOLS 1 Upper casing 2 Lower casing 3 Valve chamber 4 Inlet 5 Outlet 7 Valve seat member 8 Derivation path 9 Temperature control element 10 Wall member 11 Diaphragm 12 Expansion medium 13 Valve member 14 Fluid passage hole 15 Bimetal 16 Gasket 18 Seal of valve seat member Surface 19 Sealing surface of valve member

Claims (1)

A valve casing that forms an inlet, a valve chamber, and an outlet, a valve seat member that forms a lead-out path that connects the valve chamber and the outlet, and an expansion medium is enclosed between the wall member and the diaphragm member, and the valve member is attached to the diaphragm member A temperature control element, a valve seat member is attached between the valve chamber and the outlet, a valve member is opposed to the valve seat member, a temperature control element is attached to the valve chamber, and a diaphragm member by expansion and contraction of the expansion medium The valve member is separated from and seated on the valve seat member by the displacement of the valve member, and a seal member is provided for sealing between the inner peripheral wall of the valve casing and the outer periphery of the temperature control element, and the wall member and the diaphragm are provided on the temperature control element. A fluid passage hole is formed through the member and the valve member, and a sealing surface is formed on the valve member to close the outlet passage of the valve seat member when the valve member is seated on the valve seat member, and the fluid passage hole of the valve member is formed. Valve seat with sealing surface to close When the material is formed into a material, the fluid is deformed at a predetermined high temperature that is higher than the expansion and contraction temperature of the expansion medium and lower than the saturation temperature, and the fluid passage hole is opened when the temperature is lower than the predetermined high temperature. A thermally responsive steam trap comprising a temperature responsive member for closing a fluid passage hole.

Images