JP2011064228A - Thermally reactive steam trap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermally reactive steam trap which never causes leak of steam even when foreign matter is bitten between a seal surface of a valve seat member and a valve member. <P>SOLUTION: The trap includes a gasket 16 as a seal member which seals a gap between the inner circumferential wall of a lower casing 2 and the outer circumference of a temperature control element 9. The temperature control element 9 includes a fluid passing hole 14 formed to extend through a wall member 10, a diaphragm member 11 and a valve member 13, and the valve seat member 7 includes a seal surface 18 which closes the fluid passing hole 14 when the valve member 13 is seated in the valve seat member 7. The trap further includes a bimetal 15 as a temperature reactive member which deforms at a predetermined high temperature higher than the expanding/contracting temperature of an expansion medium 12 and lower than the saturation temperature thereof to open the fluid passing hole 14 at a temperature lower than the predetermined high temperature and close the fluid passing hole 14 at a temperature higher than the predetermined high temperature. <P>COPYRIGHT: (C)2011,JPO&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 enclosed between the wall member and the diaphragm, and the diaphragm member With a temperature control element attached between the valve chamber and the outlet, with the valve member facing the valve seat member and the temperature control element attached to the valve chamber, by expansion and contraction of the expansion medium The valve member is separated from and seated on the valve seat member by displacement of the diaphragm 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 seal surface for closing the fluid passage hole when the valve member is seated on the valve seat member is formed on the valve seat member.

JP-A-9-004790

In the conventional heat-responsive steam trap, when a foreign matter such as dust or scale in the fluid is caught between the valve member and the sealing surface of the valve seat member on which the valve member is attached and detached, the fluid passage hole of the valve member is formed. There was a problem that the valve member could not be displaced to the fully closed position where it was completely sealed, 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 seat member and the valve 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. The temperature control element is provided with a seal member, a fluid passage hole is formed in the temperature control element through the wall member, the diaphragm member, and the valve member, and the fluid passage hole is closed when the valve member is seated on the valve seat member. Seal face on valve seat In which the fluid passage hole is opened when the temperature is lower than the predetermined high temperature, and the fluid passage hole is opened when the temperature is higher than the predetermined high temperature. A temperature responsive member for closing the passage hole is provided.

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 of a predetermined temperature or higher that should not be discharged by biting foreign matter between the seal surface of the valve seat member and the valve member leaks, and the valve chamber expands. When the temperature is higher than a predetermined high temperature that is higher than the expansion and contraction temperature of the medium and lower than the saturation temperature, the temperature responsive member closes the fluid passage hole, thereby preventing condensate and vapor leakage higher than the predetermined high temperature. There is an effect.

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. An inlet 4 communicating with the valve chamber 3 is formed in the upper casing 1, and an outlet 5 communicating with the valve chamber 3 is formed in the lower casing 2. 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 11 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 that is higher than the expansion and contraction temperature of the expansion medium 12 and lower than the saturation temperature, and the fluid passage hole 14 is opened when the temperature is higher 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 sealing 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.

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. Due to the expansion of the expansion medium 12, the diaphragm member 11 is 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 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 fluid passage hole 14 is closed, 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, but the pressure on the outlet 5 side of the valve chamber 3 reaches the outlet 5 side pressure. 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 to be fluid. The passage hole 14 is opened. Thereby, condensate having a temperature lower than the predetermined temperature is discharged from the outlet 5. Condensate of a predetermined temperature or higher that should not be exhausted between the seal surface 18 of the valve seat member 7 and the valve member 13 is leaked, and the inside of the valve chamber 3 is higher than the expansion / contraction temperature of the expansion medium 12. When the temperature becomes higher than a predetermined high temperature 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 Lead-out 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

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 seat member for closing the fluid passage hole when the valve member is seated on the valve seat member. Even saturated at high temperature A temperature responsive member provided with a temperature responsive member that deforms at a predetermined high temperature lower than the predetermined temperature, opens the fluid passage hole when the temperature is lower than the predetermined high temperature, and closes the fluid passage hole when the temperature is higher than the predetermined high temperature. Formula steam trap.

Images