JPH094791A - Thermally-actuated steam trap - Google Patents

Abstract

PURPOSE: To provide a thermally-actuated steam trap to perform intermittent opening and closing operation. CONSTITUTION: A thermally-actuated steam trap comprises valve casings 1 and 2 to form an inlet 4, a valve chamber 3, and an outlet 5; a valve seat member 7 to form an output passage 8 to intercommunicate a valve chamber and an outlet; and a temperature control element 9 wherein a space between a wall member 12 and a diaphragm 14 is sealed with an expansion medium 22 and a valve member 16 is attached to a diaphragm. A valve seat member is arranged between the valve chamber and the outlet and the valve member is positioned facing the valve seat member and the temperature control element is attached to the valve chamber. The inner peripheral wall 24 of the valve casing and a space between the outer periphery of the temperature control element is sealed with a gasket and arranged. A fluid pass hole 20 is formed in the temperature control element in such a state to extend through a wall member, a diaphragm, and a valve member. A seal surface 28 to close the output passage of the valve seat member when the valve member seats the valve seat member is formed at the valve member and a seal surface 29 to close the fluid pass hole of the valve member is formed at the valve seat member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field 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, 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 such a thermo-responsive steam trap of this type, the on-off valve operation is repeated little by little after the expansion and contraction temperature of the expansion medium, so that the condensate cannot be recovered. And it is not desirable because it may be mistaken for a steam leak. Further, there is a problem that the valve member and the valve seat member are worn out early, causing steam leakage.

Therefore, a technical object of the present invention is to provide a heat-actuated steam trap which performs intermittent on-off valve operation.

[0006]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above-mentioned technical problems includes 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 off 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 the temperature control element penetrates the wall member, the diaphragm and the valve member to form a fluid passage hole, and a valve seat member of the valve member. Seat for closing the lead-out path of the valve seat member when seated on the seat To close the fluid passage hole of the valve member to form the surface on the valve member - in Mutorappu - Le surface thermally responsive type steel formed in the valve seat member.

[0007]

The operation of the above technical means is as follows.
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.

[0008]

EXAMPLE An example showing a concrete 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 central opening 10 and an inlet 11.
A wall member 12 having a central opening 13, a diaphragm 14 having a central opening 13, and a valve member 16 having a central opening 15.
And the fixed wall member 1 having an opening through which the valve member 16 comes in and out.
7.

The diaphragm 14 and the valve member 16 are welded (reference numeral 18) with the respective central openings 13 and 15 arranged side by side.
Further, the edge of the central opening 10 of the wall member 12 and the diaphragm 14
The edge of the central opening 13 is welded (reference numeral 19) to form the fluid passage hole 20 penetrating the wall member 12, the diaphragm 14 and the valve member 16 by the central openings 10, 13, 15. The outer peripheral edges of the wall member 12, the diaphragm 14, and the fixed wall member 17 are welded (reference numeral 21). Wall member 12
The expansion medium 22 is injected from the injection port 11 into the sealed space between the diaphragm 14 and the diaphragm 14, and the expansion medium 22 is closed by the plug member 23. Expansion medium 2
2 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

In the temperature control element 9, the valve member 16 is arranged in the valve chamber 3 so as to face the valve seat member 7, and the sealing means is provided on the step portion 25 formed on the inner peripheral wall 24 of the lower casing 2. It is mounted via the gasket 26 as the above and is held by the snap ring 27. Inner peripheral wall 2 of lower casing 2 by gasket 26
4 and the outer periphery of the temperature control element 9 are sealed. Valve member 1
A seal surface 28 for closing the lead-out passage 8 of the valve seat member 7 when seated on the valve seat member 7 is formed on the lower surface of 6. Also, the valve seat member 7
A seal surface 29 for closing the fluid passage hole 20 of the valve member 16 is formed on the upper surface of the.

When the temperature in the valve chamber 3 rises, the expansion medium 22
Expands. The diaphragm 14 is displaced downward by the expansion of the expansion medium 22, and the valve member 16 is seated on the valve seat member 7. When the valve member 16 is seated on the valve seat member 7, the valve member 16
A seal surface 28 of the valve seat member 7 closes the outlet passage 8 of the valve seat member 7, and a seal surface 29 of the valve seat member 7 closes the fluid passage hole 20 of the valve member 16. This prevents vapor leakage.
When the outlet passage 8 and the fluid passage hole 20 are closed, the interior of the lower casing 2 and the outer periphery of the temperature control element 9 are sealed by the gasket 26, so that the temperature inside the valve chamber 3 is reduced. The control element 9 is sandwiched between the inlet 4 side and the outlet 5 side. When the temperature in the valve chamber 3 decreases, the expansion medium 22 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 decreases. Since the force for displacing 14 upward is reduced, the diaphragm 14 is displaced upward after the temperature inside the valve chamber 3 further decreases, the valve member 16 is separated from the valve seat member 7, and the seal of the valve member 16 is reduced. The ring surface 28 opens the outlet passage 8 of the valve seat member 7, and the seal surface 29 of the valve seat member 7 opens the fluid passage hole 20 of the valve member 16. As a result, the condensate is discharged from the outlet 5.

[0013]

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, there is no mistake for steam leakage at the time of condensate discharge, and wear of the valve member and valve seat member is less likely to occur. It can be carried out.

[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 outlet passage 9 temperature control element 12 wall member 14 diaphragm 16 valve member 20 fluid passage hole 22 expansion medium 24 of lower casing Inner peripheral wall 26 Gasket 28 Seal surface of valve member 29 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 seal member is provided, the temperature control element penetrates the wall member, the diaphragm, and the valve member to form a fluid passage hole, and the lead-out passage of the valve seat member is closed when the valve member is seated on the valve seat member. A heat-actuated steam trap, wherein a surface is formed on the valve member and a seal surface for closing the fluid passage hole of the valve member is formed on the valve seat member.