JPH09196292A - Thermally actuated steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an intermittent valve opening/closing operation and to prevent reverse flowing. SOLUTION: A gasket for tightly sealing a part between the inner circumferential wall 26 of a valve casing 2 and the outer periphery of a temperature controller element 9 is provided. A fluid passing hole 22 penetrating the temperature controller element 9 is composed of the check valve port 10 of a wall member 12, the center opening 13 of a diaphragm 14 and the center opening 15 of a valve member 17. A check valve body 18 for opening/closing the check valve port 10 is arranged in the fluid passing hole 22. A seal surface 30 for closing the efferent path 8 of a valve seat member 7 during the seating of the valve member 17 in the valve seat member 7 is formed and a seal surface 31 for closing the fluid passing hole 22 of the valve member 17 is formed in the valve seat member 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap for automatically discharging condensate generated in various steam-using devices and steam pipes, and more particularly, it is heated and cooled by steam and condensate and expands according to its temperature. The present invention relates to a heat-actuated steam trap that discharges condensed water below a desired temperature to the outside of a system by using a temperature control element containing a contracting medium.

[0002]

2. Description of the Related Art The basic structure of a heat-actuated steam trap is known from, for example, Japanese Unexamined Patent Publication No. 6-129598. As understood from the publication, a valve casing having an inlet, a valve chamber and an outlet, a valve seat member having a lead-out passage communicating with the valve chamber and the outlet, and an expansion between a wall member and a 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 valve member faces the valve seat member so that the temperature control element is in the valve chamber. A seal that installs a gap for fluid passage between the inner wall of the valve casing and the outer periphery of the temperature control element and closes the lead-out path of the valve seat member when the valve member is seated on the valve seat member. The surface is formed on the valve member.

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 from leaking out. When the temperature in the valve chamber decreases, the expansion medium contracts, and the valve member separates from the valve seat member to open the outlet passage. This discharges the condensate out of the system.

[0004]

However, in the heat-actuated steam trap of this type, since the opening / closing valve operation is repeated in small increments with the expansion / contraction temperature of the expansion medium as a boundary, if condensate occurs. It was not desirable because it was mistaken for a steam leak. Further, there is a problem that the valve member and the valve seat member are worn out early to cause vapor leakage. In addition, when the fluid pressure on the outlet side becomes higher than that on the inlet side, the fluid on the outlet side flows backward and reaches various steam-using devices, which lowers the thermal efficiency of the steam-using devices.
In addition, there is a problem that steam-powered equipment may be damaged when an impact reverse flow occurs due to a water hammer at the outlet side.

Therefore, a technical problem of the present invention is to provide a heat-actuated steam trap capable of performing intermittent on-off valve operation and preventing backflow.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problem is a valve casing having an inlet, a valve chamber and an outlet, and a valve chamber and an outlet communicating with each other. It has a valve seat member that forms a discharge path and a temperature control element that encloses an expansion medium between the wall member and the diaphragm and attaches the valve member to the diaphragm. The valve seat member is attached between the valve chamber and the outlet. In the case where the valve member faces the valve seat member, the temperature control element is attached to the valve chamber, and the valve member is seated on and away from the valve seat member by the displacement of the diaphragm due to the expansion and contraction of the expansion medium, A seal member is provided to seal between the peripheral wall and the outer periphery of the temperature control element, and a fluid passage hole is formed in the temperature control element by penetrating the wall member, diaphragm and valve member. A stop valve is provided to allow flow from the inlet side to the outlet side. A check valve body is installed to stop the flow in the opposite direction, and a seal surface is formed on the valve member to close the lead-out path of the valve member when the valve member is seated on the valve seat member. It is a heat-actuated steam trap in which a seal surface for closing a hole is formed on a valve seat member.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention seals a space between an inner peripheral wall of a valve casing and an outer periphery of a temperature control element with a seal member, and forms a wall member, a diaphragm and a valve on the temperature control element. The check valve is provided in the fluid passage hole that penetrates the member, the check valve body is arranged, and the seal surface that closes the outlet passage of the valve seat member when the valve member is seated on the valve seat member is used as the valve member. And a seal surface for closing the fluid passage hole of the valve member is formed on the valve seat member.

In a normal state where 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 the rise 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 member closes the outlet path of the valve seat member and the seat of the valve seat member. The ring surface closes the fluid passage hole of the valve member. The inner wall of the valve casing and the outer periphery of the temperature control element are sealed by a seal member, and the outlet passage and the fluid passage hole are closed, so that the temperature control element is protected in the valve chamber. It is divided into an inlet side and an outlet side by sandwiching it. The pressure in the outlet side valve chamber, which is isolated from the inlet side and becomes a closed space, also decreases as the temperature decreases. Therefore, the force for displacing the diaphragm facing the outlet side valve chamber in the valve opening direction decreases. This makes it difficult for the diaphragm to quickly displace when the expansion medium contracts due to the decrease in the temperature in the valve chamber, and when the temperature in the valve chamber further decreases, the diaphragm displaces and the valve member separates from the valve seat member. The seal surface of the member opens the lead-out path of the valve seat member, and the seal surface of the valve seat member opens the fluid passage hole of the valve member. This makes it possible to perform an intermittent on-off valve operation.

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 to close the check valve port and shut off the fluid passage hole. As a result, the backflow on the outlet side does not reach various steam-using devices.

[0010]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). In FIG. 1, 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 has a valve chamber 3
An inlet 4 communicating with the lower casing 2 is formed in the lower casing 2.
Forming an outlet 5 communicating with 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 has a plurality of outlet passages 8 that connect the valve chamber 3 and the outlet 5.

A temperature control element 9 is arranged above the valve seat member 7. The temperature control element 9 has a check valve port 10 and an injection port 11.
A wall member 12 having a central opening 13, a diaphragm 14 having a central opening 13, a valve member 17 having a central opening 15 and a rib 16 formed at the upper end thereof, and a vertically movable member between the check valve opening 10 and the rib 16. The check valve body 18 is arranged and a fixed wall member 19 having an opening through which the valve member 17 comes in and out.

A valve member 17 is welded to the diaphragm 14 (reference numeral 20). Further, the diaphragm 14 is attached to the wall member 12.
Are welded (reference numeral 21). The check valve port 10 and the central openings 13 and 15 form a fluid passage hole 22 penetrating the wall member 12, the diaphragm 14 and the valve member 16. The outer peripheral edges of the wall member 12, the diaphragm 14, and the fixed wall member 19 are welded (reference numeral 23). From the inlet 11 to the expansion medium 2 in the closed space between the wall member 12 and the diaphragm 14.
4 is injected and closed with the plug member 25. The expansion medium 24 is water,
It is formed of a liquid having a boiling point lower than that of water, or a mixture thereof.

In the temperature control element 9, the valve member 17 is arranged in the valve chamber 3 so as to face the valve seat member 7, and a sealing means is provided on a step portion 27 formed on the inner peripheral wall 26 of the lower casing 2. It is mounted via the gasket 28 as the above and is held by the snap ring 29. Inner peripheral wall 2 of lower casing 2 by gasket 28
6 and the outer periphery of the temperature control element 9 are sealed. Valve member 1
A seal surface 30 is formed on the lower surface of 6 to close the lead-out passage 8 of the valve seat member 7 when seated on the valve seat member 7. Also, the valve seat member 7
A seal surface 31 for closing the fluid passage hole 22 of the valve member 16 is formed on the upper surface of the.

In a normal state where 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 due to the action of the fluid pressure on the inlet 4 side and rests on the rib 16 of the valve member 17. The check valve port 10 is opened. When the temperature inside the valve chamber 3 rises, the expansion medium 24 expands. The diaphragm 14 is displaced downward by the expansion of the expansion medium 24, 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 member 17 closes the outlet passage 8 and the seal surface 31 of the valve seat member 7 closes the fluid passage hole 22. This prevents vapor leakage. When the outlet passage 8 and the fluid passage hole 22 are closed, the gasket 2 is provided between the inner peripheral wall 26 of the lower casing 2 and the outer periphery of the temperature control element 9.
Since it is sealed by 8, the inside of the valve chamber 3 is separated on the inlet 4 side and the outlet 5 side across the temperature control element 9. Valve room 3
When the internal temperature decreases, the expansion medium 24 contracts and the diaphragm 14 is displaced upward. However, as the temperature decreases, the pressure on the outlet 5 side of the valve chamber 3 also decreases and the diaphragm 14 moves upward. Since the force for displacing is reduced, the diaphragm 14 is displaced upward after the temperature in the valve chamber 3 is further reduced, and the valve member 17 is separated from the valve seat member 7.
The seal surface 30 of the valve seat 7 opens the outlet passage 8 and the valve seat member 7
The seal surface 31 of the above opens the fluid passage hole 22. As a result, the condensate is discharged from the outlet 5.

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 to close the check valve opening 10 and shut off the fluid passage hole 22. To do. This prevents backflow.

[0016]

The present invention has the following specific effects. As described above, the heat-actuated steam trap according to the present invention is
Since intermittent on-off valve operation can be performed, it is not mistaken for steam leak when condensate is discharged, and wear of the valve member and valve seat member does not easily occur, and good on-off valve operation is performed for a long period of time. be able to. In addition, since the backflow can be prevented, the thermal efficiency of the steam-using device is not reduced or damaged.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a heat-actuated steam trap according to the present invention.

[Explanation of symbols]

 1 Upper casing 2 Lower casing 3 Valve chamber 4 Inlet 5 Outlet 7 Valve seat member 8 Outflow path 9 Temperature control element 10 Check valve opening 12 Wall member 14 Diaphragm 17 Valve member 18 Check valve body 22 Fluid passage Hole 24 Expansion medium 26 Inner peripheral wall of lower casing 28 Gasket 30 Seal surface of valve member 31 Seal surface of valve seat member

Claims (1)

[Claims] 1. A diaphragm in which an expansion medium is sealed between a wall member and a diaphragm, a valve casing having an inlet, a valve chamber and an outlet formed therein, a valve seat member having a lead-out passage communicating with the valve chamber and the outlet. Equipped with a temperature control element with a valve member attached to
The valve seat member is mounted between the valve chamber and the outlet, the valve member is faced to the valve seat member, the temperature control element is mounted on the valve chamber, and the valve member is mounted on the valve seat member by displacement of the diaphragm due to expansion and contraction of the expansion medium. For seats that are to be separated and seated, a seal that seals between the inner wall of the valve casing and the outer periphery of the temperature control element.
A temperature control element, a fluid passage hole is formed through the wall member, diaphragm and valve member in the temperature control element, and a check valve port is provided in the fluid passage hole to allow flow from the inlet side to the outlet side. A check valve body is arranged to stop the flow in the opposite direction, and a seal surface is formed on the valve member to close the lead-out passage of the valve member when the valve member is seated on the valve seat member. A heat-actuated steam trap characterized in that a seal surface for closing the valve is formed on a valve seat member.