JP3641048B2 - Thermally responsive steam trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam trap that automatically discharges condensate generated in various steam-using devices and steam pipes, and in particular, temperature control 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 uses elements to discharge condensate below a desired temperature out of the system.
[0002]
[Prior art]
The basic structure of a thermally responsive steam trap is known from, for example, Japanese Patent Application Laid-Open No. 6-129598. As understood from the publication, the valve casing is formed with an inlet, a valve chamber and an outlet, the valve seat member is formed with a lead-out path communicating with the valve chamber and the outlet, and the wall member is expanded between the diaphragm and the diaphragm. It is equipped with a temperature control element in which a medium is enclosed and a valve member is attached to the diaphragm. The valve seat member is attached between the valve chamber and the outlet, and the temperature control element is placed in the valve chamber by facing the valve member to the valve seat member. A seal is provided between the inner wall of the mounting and valve casing and the outer periphery of the temperature control element to close the valve seat outlet when the valve member is seated on the valve seat member. The surface is formed on the valve member.
[0003]
When the temperature in the valve chamber rises, the expansion medium expands, and the valve member is seated on the valve seat member via the diaphragm to close the outlet passage. This prevents steam leakage. When the temperature in the valve chamber decreases, the expansion medium contracts, and the valve member is separated from the valve seat member to open the outlet passage. As a result, the condensate is discharged out of the system.
[0004]
[Problems to be solved by the invention]
However, in this type of thermally responsive steam trap, the on-off valve operation is repeated in small increments with the expansion / contraction temperature of the expansion medium as the boundary, so the condensate is discharged once and it is mistaken for a steam leak That was undesirable. Further, there is a problem that the valve member and the valve seat member are worn at an early stage to cause steam leakage.
Further, when the fluid pressure on the outlet side becomes higher than that on the inlet side, the fluid on the outlet side flows backward to reach various steam-using devices, and there is a problem of reducing the thermal efficiency of the steam-using devices. In addition, there was a problem of damaging the steam-using equipment when a shocking backflow caused by a water hammer on the outlet side occurred.
[0005]
Therefore, the technical problem of the present invention is to provide a thermally responsive steam trap that can intermittently operate the on-off valve and prevent backflow.
[0006]
[Means for solving the problems]
The technical means of the present invention taken in order to solve the above technical problems are a valve casing in which an inlet, a valve chamber, and an outlet are formed, and a valve seat member in which a lead-out path that connects the valve chamber and the outlet is formed. And a temperature control element in which an expansion medium is sealed between the wall member and the diaphragm and the valve member is attached to the diaphragm, 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 due to expansion and contraction of the expansion medium. The inner wall of the valve casing and the outer periphery of the temperature control element A seal member is provided to seal the gap, a fluid passage hole is formed in the temperature control element through the wall member, diaphragm, and valve member. Non-return that allows flow to the outlet side and stops reverse flow The body was placed, sheet to close the fluid passage hole of the valve member when seated on the valve seat member of the valve member - is in Mutorappu - thermally actuated to form a Le plane valve seat member type steel.
[0007]
[Form of the present invention]
The present invention provides a fluid passage hole that seals between the inner peripheral wall of the valve casing and the outer periphery of the temperature control element with a seal member, and penetrates the wall member, diaphragm, and valve member formed in the temperature control element. A check valve body is provided in the valve seat member, and a seal surface is formed on the valve seat member to close the fluid passage hole of the valve member when the valve member is seated on the valve seat member. .
[0008]
During normal times when the fluid pressure on the inlet side is higher than that on the outlet side, the check valve body closes the check valve port. When the expansion medium expands due to an increase in the temperature in the valve chamber, the valve member is seated on the valve seat member via the diaphragm, and the seal surface of the valve seat member closes the fluid passage hole of the valve member. The space between the inner wall of the valve casing and the outer periphery of the temperature control element is sealed by a seal member, and the fluid passage hole is closed, so that the valve chamber has an inlet with the temperature control element in between. It is separated into a side and an exit side. In the outlet side valve chamber that is isolated from the inlet side and communicated with the outlet side, the pressure is reduced to the outlet side pressure, so that the force that displaces the diaphragm facing the outlet side valve chamber in the valve opening direction is reduced. This makes it difficult for the diaphragm to be quickly displaced when the expansion medium contracts due to a decrease in the valve chamber temperature. After the temperature in the valve chamber further decreases, the diaphragm is displaced and the valve member is separated from the valve seat member. The seal surface of the seat member opens the fluid passage hole of the valve member. As a result, intermittent on-off valve operation can be performed.
[0009]
When the fluid pressure on the outlet side becomes higher than that on the inlet side, the check valve body receives the action of the fluid pressure on the outlet side, closes the check valve port, and blocks the fluid passage hole. Thereby, the backflow on the outlet side does not reach various steam using devices.
[0010]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1).
In FIG. 1, an upper casing 1 and a 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.
[0011]
A temperature control element 9 is disposed above the valve seat member 7. The temperature control element 9 includes a wall member 12 in which a check valve port 10 and an injection port 11 are formed, a diaphragm 14 in which a central opening 13 is formed, a valve member 17 in which a central opening 15 and a rib 16 are formed at the upper end thereof. The check valve body 18 is disposed between the check valve port 10 and the rib 16 so as to be movable up and down, and the fixing wall member 19 is formed with an opening through which the valve member 17 enters and exits.
[0012]
The valve member 17 is welded to the diaphragm 14 (reference number 20). Further, the diaphragm 14 is welded to the wall member 12 (reference number 21). A fluid passage hole 22 penetrating the wall member 12, the diaphragm 14, and the valve member 16 is formed by the check valve port 10 and the central openings 13 and 15. The outer peripheral edges of the wall member 12, the diaphragm 14, and the fixed wall member 19 are welded (reference numeral 23). The expansion medium 24 is injected into the sealed space between the wall member 12 and the diaphragm 14 from the injection port 11 and is closed with the plug member 25. The expansion medium 24 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.
[0013]
The temperature control element 9 has a valve member 17 facing the valve seat member 7 and disposed in the valve chamber 3, and a step 27 formed on the inner peripheral wall 26 of the lower casing 2 is a gasket as a sealing means. 28, and is held by a snap ring 29. A gasket 28 seals between the inner peripheral wall 26 of the lower casing 2 and the outer periphery of the temperature control element 9. A seal surface 30 for closing the fluid passage hole 22 when the valve member 16 is seated on the upper surface of the valve seat member 7 is formed.
[0014]
When the fluid pressure on the inlet 4 side is higher than that on the outlet 5 side, the check valve body 18 is displaced downward under the action of the fluid pressure on the inlet 4 side and rests on the rib 16 of the valve member 17. The valve port 10 is opened. When the temperature in the valve chamber 3 rises, the expansion medium 24 expands. Due to the expansion of the expansion medium 24, the diaphragm 14 is displaced downward, and the valve member 17 is seated on the valve seat member 7. When the valve member 17 is seated on the valve seat member 7, the seal surface 30 of the valve seat member 7 closes the fluid passage hole 22 of the valve member 16. This prevents steam leakage. When the fluid passage hole 22 is closed, the space between the inner peripheral wall 26 of the lower casing 2 and the outer periphery of the temperature control element 9 is sealed by the gasket 28, so that the inside of the valve chamber 3 is in the temperature control element 9. Is separated into the inlet 4 side and the outlet 5 side. When the temperature in the valve chamber 3 decreases, the expansion medium 24 contracts and the diaphragm 14 is displaced upward. However, the pressure on the outlet 5 side of the valve chamber 3 decreases to the outlet 5 side pressure. Therefore, the force for displacing the diaphragm 14 upward is weak, the diaphragm 14 is displaced upward after the temperature in the valve chamber 3 is further lowered, and the valve member 17 is separated from the valve seat member 7. The seal surface 30 opens the fluid passage hole 22 of the valve member 16. As a result, the condensate is discharged from the outlet 5.
[0015]
When the fluid pressure on the outlet 5 side becomes higher than that on the inlet 4 side, the check valve body 18 receives the action of the fluid pressure on the outlet 5 side, closes the check valve port 10 and blocks the fluid passage hole 22. This prevents backflow.
[0016]
【The invention's effect】
The present invention produces the following specific effects.
As described above, the thermally responsive steam trap according to the present invention can intermittently operate the on-off valve, so that it is not mistaken for steam leakage when condensate is discharged, and wear of the valve member and the valve seat member does not occur. It becomes difficult to occur, and a favorable on-off valve operation can be performed for a long time. Moreover, since the backflow can be prevented, the thermal efficiency of the steam using device is not lowered or damaged.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a thermally responsive steam trap according to the present invention.
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 Check valve port 12 Wall member 14 Diaphragm 17 Valve member 18 Check valve body 22 Fluid passage Hole 24 Expansion medium 26 Inner peripheral wall 28 of lower casing Gasket 30 Seal surface of valve seat 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, and the valve member is attached to the diaphragm The temperature control element is provided, the valve seat member is attached between the valve chamber and the outlet, the valve member is opposed to the valve seat member, the temperature control element is attached to the valve chamber, and the diaphragm is expanded and contracted by the expansion medium. A seal member that seals between the inner peripheral wall of the valve casing and the outer periphery of the temperature control element is provided to displace the valve member on the valve seat member by displacement, and the wall member is provided on the temperature control element. A fluid passage hole is formed through the diaphragm and valve member, and a check valve body is provided in the fluid passage hole to allow flow from the inlet side to the outlet side and stop the reverse flow. The fluid passage hole of the valve member when the valve member is seated on the valve seat member Closing sheet - thermally responsive type, characterized in that the formation of the Le plane valve seat member steel - Mutorappu.

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