JPH09250690A - Thermal reaction type steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal reaction type steam trap which operates an intermittent opening and closing valve operation, as well as reduces the number of part items. SOLUTION: An inlet 4, a valve chamber 3, and an outlet 5 are formed to valve casings 1 and 2. A temperature control element 9 made by fixing the outer peripheral edge of a diaphragm 14 between an upper wall member 12 and a lower wall member 17, sealing an expansion medium 22 between the upper wall member and the diaphragm 14, and a temperature control element 9 mounting a valve member 16 to the diaphragm 14, is in stalled in the valve chamber 3. A gasket 26 to seal between the inner peripheral wall 24 of the valve casings and the outer periphery of the temperature control element 9 is provided. A fluid passing hole 20 is formed to the temperature control element 9 by penetrating the upper wall member, the diaphragm, and the valve member. Leading-out passages 8 are formed to the lower wall member. A seal surface 29 to block the fulid passing hole is formed to the lower wall member, while seal surfaces 28 to block the leading-out passages of the lower wall member 17 in the seating condition of the valve member 16 to the lower wall member are formed to the valve member 16.

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, for example, from Japanese Patent Application Laid-Open No. 8-287787. 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 the valve chamber and the outlet, and a diaphragm between two upper and lower wall members. The valve member is attached between the valve chamber and the outlet by attaching the valve member to the diaphragm by sealing the expansion medium between the upper wall member and the diaphragm by fixing the outer peripheral edge of the valve member. The valve seat member with the temperature control element facing the valve seat member, and a fluid passage gap is provided between the inner wall of the valve casing and the outer circumference of the temperature control element. The valve member has a seal surface for closing the lead-out path of the valve seat member when seated 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]

SUMMARY OF THE INVENTION In the above prior art,
There has been a problem that the lead-out path has to be formed in a valve seat member different from the temperature control element, resulting in an increase in the number of parts.
Further, in the above-described conventional heat-actuated steam trap, since the opening / closing valve operation is repeated in small increments with the expansion / contraction temperature of the expansion medium as the boundary, the condensed water is discharged as if it were a vapor leak. There was a mistake and it was not desirable.

Therefore, a technical object of the present invention is to provide a heat-actuated steam trap which reduces the number of parts and performs an intermittent opening / closing valve operation.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber and an outlet in a valve casing, and to provide two upper and lower wall members. The outer peripheral edge of the diaphragm is fixed in between, the expansion medium is enclosed between the upper wall member and the diaphragm, and the temperature control element with the valve member attached to the diaphragm is installed in the valve chamber to control the inner peripheral wall of the valve casing and the temperature control. A seal member is provided to seal the outer periphery of the element, a fluid passage hole is formed in the temperature control element through the upper wall member, the diaphragm, and the valve member, and an outlet path is formed in the lower wall member. Forming a seal surface on the valve member that closes the lead-out path of the lower wall member when seated on the lower wall member of the valve member, and forms a seal surface on the lower wall member that closes the fluid passage hole of the valve member It is in a heat-actuated steam trap.

[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 lower wall member via the diaphragm, the seal surface of the valve member closes the outlet passage of the lower wall member, and the lower wall member seals. 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. In the space between the diaphragm and the lower wall member, which is isolated from the inlet side and becomes a closed space, the pressure also decreases as the temperature decreases, so
The force that displaces the diaphragm 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 lower wall member. The seal surface of the member opens the lead-out path of the lower wall member, and the seal surface of the lower wall member opens the fluid passage hole of the valve member. This makes it possible to perform an intermittent on-off valve operation. Also, since the outlet path is formed in the lower wall member of the temperature control element,
A valve seat member for forming the lead-out path is unnecessary. This makes it possible to reduce the number of parts.

[0008]

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 temperature control element 9 is arranged in the valve chamber 3.
The temperature control element 9 opened the upper wall member 12 having the central opening 10 and the inlet 11, the diaphragm 14 having the central opening 13, the valve member 16 having the central opening 15, and the outlet passage 8. It comprises a lower wall member 17 and an expansion medium 22 enclosed between the upper wall member 12 and the diaphragm 14.

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.
The edge of the central opening 10 of the upper wall member 12 and the diaphragm 1
The edge of the central opening 13 of 4 is welded (reference numeral 19), and the central openings 10, 13, 15 form a fluid passage hole 20 passing through the upper wall member 12, the diaphragm 14, and the valve member 16. Upper wall member 12, diaphragm 14, and lower wall member 17
Are welded (reference numeral 21). Injection port 11 is provided in a closed space between upper wall member 12 and diaphragm 14.
The expansion medium 22 is injected from the container, and the plug member 23 is closed. The expansion medium 22 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The temperature control element 9 is mounted on a step portion 25 formed on the inner peripheral wall 24 of the lower casing 2 via a gasket 26 as a sealing means and held by a 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 path 8 of the lower wall member 17 when seated on the lower wall member 17 is formed on the lower surface of 6. Further, a seal surface 29 that closes the fluid passage hole 20 of the valve member 16 is formed on the upper surface of the lower wall member 17.

When the temperature in the valve chamber 3 rises, the expansion medium 22
Expands. The expansion of the expansion medium 22 causes the diaphragm 14 to be displaced downward, so that the valve member 16 is seated on the lower wall member 17. When the valve member 16 is seated on the lower wall member 17, the seal surface 28 of the valve member 16 closes the lead-out passage 8 of the lower wall member 17 and the seal surface 29 of the lower wall member 17 moves to the fluid of the valve member 16. The passage hole 20 is closed. This prevents vapor leakage. When the outlet passage 8 and the fluid passage hole 20 are closed,
Since the gasket 26 seals between the inner peripheral wall 24 of the lower casing 2 and the outer periphery of the temperature control element 9, the inside of the valve chamber 3 sandwiches the temperature control element 9 and the inlet 4 side and the outlet 5 side. Separated by. When the temperature in the valve chamber 3 decreases, the expansion medium 22 contracts and the diaphragm 14 displaces upward. However, as the temperature decreases, the pressure in the space between the diaphragm 14 and the lower wall member 17 decreases. Also drops, diaphragm 14
Since the force for displacing the valve member is reduced, the diaphragm 14 is displaced upward and the valve member 16 is separated from the lower wall member 17 after the temperature in the valve chamber 3 further decreases, and the seal of the valve member 16 is released. The surface 28 opens the outlet passage 8 of the lower wall member 17, and the seal surface 29 of the lower wall member 17 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
By forming the lead-out path in the lower wall member of the temperature control element, the number of parts can be reduced. In addition, by performing the intermittent on-off valve operation, it is not mistaken for a steam leak at the time of condensate discharge.

[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 8 Outlet path 9 Temperature control element 12 Upper wall member 14 Diaphragm 16 Valve member 17 Lower wall member 20 Fluid passage hole 22 Expansion medium 24 Lower casing Inner peripheral wall 26 Gasket 28 Seal surface of valve member 29 Seal surface of lower wall member

Claims (1)

[Claims] 1. A diaphragm in which an inlet, a valve chamber and an outlet are formed in a valve casing, an outer peripheral edge of a diaphragm is fixed between two upper and lower wall members, and an expansion medium is enclosed between the upper wall member and the diaphragm. A temperature control element with a valve member attached to it is installed in the valve chamber, and a seal member is provided to seal between the inner peripheral wall of the valve casing and the outer periphery of the temperature control element, and the temperature control element has an upper wall. A sealing surface that forms a fluid passage hole through the member, diaphragm, and valve member, forms a lead-out path in the lower wall member, and closes the lead-out path in the lower wall member when seated on the lower wall member of the valve member. And a seal surface for closing a fluid passage hole of the valve member are formed on the lower wall member.