JPH1163390A - Thermally actuated steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermally actuated steam trap that can rapidly drain a large quantity of a low temperature fluid. SOLUTION: An inlet 4, a valve chamber 3 and an outlet 5 are formed at valve casings 1, 2. A first lead-out path 7 of large bore is formed between the valve chamber 3 and the outlet 5. A temperature control element 9 of such constitution that the outer peripheral edge of a diaphragm 14 is secured between an upper wall member 12 and a lower wall member 17, that an expansion medium 22 is filled between the upper wall member 12 and the diaphragm 14 and that a valve member 16 is fitted to the diaphragm 14, is arranged in the valve chamber 3. A fluid passage 30 is formed at the outer periphery of the temperature control element 9. A coil spring 24 is provided to seat the temperature control element 9 on the first lead-out passage 7 during normal operation and to separate the temperature control element 9 from the seat of the first lead-out passage 7 at the time of starting. A first seal face 26, a fluid passing hole 20 and a second lead-out path 27 of small bore are formed at the lower wall member 17, and a second seal face 28 is formed at 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 equipment and steam pipes, and more particularly, to a steam trap which is heated and cooled by steam and condensate and expands in accordance with the temperature. The present invention relates to a thermo-responsive steam trap for discharging condensate below a desired temperature out of the system by using a temperature control element containing a contracting medium.

[0002]

2. Description of the Related Art The basic structure of a thermally responsive steam trap is known, for example, from Japanese Patent Application Laid-Open No. 8-28787. As understood from the publication, a valve casing forming an inlet, a valve chamber, and an outlet, a valve seat member forming an outlet path communicating the valve chamber with the outlet, and a diaphragm between the upper and lower two wall members. A temperature control element in which an expansion medium is sealed between the upper wall member and the diaphragm by fixing an outer peripheral edge of the valve member, and a valve member is attached to the diaphragm; a valve seat member is attached between the valve chamber and the outlet; Facing the valve seat member, mounting the temperature control element in the valve chamber, providing a clearance for fluid passage between the inner peripheral wall of the valve casing and the outer circumference of the temperature control element, and providing a valve seat member of the valve member. The seat surface for closing the lead-out path of the valve seat member when seated on the valve member is formed on the valve member.

When the temperature inside 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 leakage of steam. 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. As a result, the condensate is discharged out of the system.

[0004]

However, in such a thermo-responsive steam trap of this type, the opening area of the lead-out passage which can be opened and closed by the temperature control element is limited, so that a large amount is required at the time of starting. There is a problem that it takes time to discharge the accumulated low-temperature fluid.

Accordingly, it is an object of the present invention to provide a thermo-responsive steam trap capable of rapidly discharging a large amount of low-temperature fluid.

[0006]

SUMMARY OF THE INVENTION The technical solution of the present invention taken to solve the above-mentioned technical problem is to form an inlet, a valve chamber and an outlet in a valve casing, and to form a valve housing between the valve chamber and the outlet. Temperature control in which a large-diameter first outlet path is formed, an outer peripheral edge of a diaphragm is fixed between two upper and lower wall members, an expansion medium is sealed between the upper wall member and the diaphragm, and a valve member is attached to the diaphragm. Placing the element in the valve chamber, forming a fluid passage between the inner peripheral wall of the valve casing and the outer periphery of the temperature control element,
A spring member is provided for seating the temperature control element on the first lead-out path during normal operation and detaching the temperature control element from the first lead-out path at startup, and closing the first lead-out path when the temperature control element is seated on the first lead-out path. The first seal surface is formed on the lower wall member, and the first seal surface of the lower wall member is formed.
A fluid passage hole is formed outside the surface of the
A thermally responsive steel plate having a small-diameter second lead-out passage formed inside the valve surface and a second seal surface formed on the valve member for closing the second lead-out passage when the valve member is seated on the lower wall member. In the mud trap.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS At start-up, the interior of the valve chamber is cold, the expansion medium contracts, the valve member separates from the lower wall member, and the second sealing surface of the valve member opens the second outlet passage. doing. At this time, since the fluid pressure on the inlet side is low, the spring member overcomes the fluid pressure on the inlet side and separates the temperature control element from the first outlet path, and the first seal surface of the lower wall member is lowered. The first outlet path is open. As a result, a large amount of low temperature fluid
It is quickly discharged from the outlet.

When the fluid pressure on the inlet side increases due to the discharge of the low-temperature fluid, the spring member is deformed by the fluid pressure on the inlet side, and the temperature control element is seated on the first outlet passage.
The first sealing surface of the lower wall member closes the first outlet path. Further, the expansion medium expands due to the rise in the temperature of the valve chamber, the valve member is seated on the lower wall member, and the second seal surface of the valve member closes the second lead-out path. This prevents leakage of steam.

[0009]

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. Valve case 3 for upper casing 1
An inlet 4 communicating with the valve chamber 3 is formed in the lower casing 2.
An outlet 5 communicating with the outlet 5 is formed. On the partition wall 6 between the valve chamber 3 and the outlet 5, a large-diameter first outlet path 7 that connects the valve chamber 3 and the outlet 5 is formed.

A temperature control element 9 is disposed in the valve chamber 3.
The temperature control element 9 includes an upper wall member 12 having an inlet 11 formed therein.
, Diaphragm 14, valve member 16, fluid passage hole 2
A lower wall member 17 having opened a second outlet passage 27 having a small diameter of 0;
It is composed of an expansion medium 22 sealed between the upper wall member 12 and the diaphragm 14. The second outlet path 27 opens at the center of the lower wall member 13, and four fluid passage holes 20 open around the second outlet path 27.

The diaphragm 14 and the valve member 16 are welded (reference numeral 18). The outer peripheral edges of the upper wall member 12, the diaphragm 14, and the lower wall member 17 are welded (reference numeral 21). The expansion medium 22 is injected into the closed space between the upper wall member 12 and the diaphragm 14 from the injection port 11 and closed with the plug member 23. The expansion medium 22 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The temperature control element 9 is urged upward by a coil spring 24 disposed between the lower casing 2 and the lower wall member 17. The coil spring 24 expands at the time of starting when the fluid pressure on the inlet 4 side is low, and raises the temperature control element 9 to move the first outlet path 7.
Let go. Further, the coil spring 24 contracts during normal operation in which the fluid pressure on the inlet 4 side is high, and the temperature control element 9 is seated on the first outlet path 7. The outer periphery of the temperature control element 9 is guided by a plurality of ribs 25 formed on the inner periphery of the lower casing 2. The space between the plurality of ribs 25 is a fluid passage passage 30.
When the temperature control element 9 is seated on the first outlet path 7, a first seal surface 26 for closing the first outlet path 7 is formed on the lower wall member 17, and a fluid is provided outside the first seal surface 26. A passage hole 20 is formed, and a small-diameter second lead-out passage 27 is formed inside the first seal surface 26.
To form When the valve member 16 is seated on the lower wall member 17, the second sealing surface 28 that closes the second outlet path 27 is moved to the valve member 16.
Formed.

At the time of starting, the temperature in the valve chamber 3 is low, the expansion medium 22 contracts, the valve member 16 is separated from the lower wall member 17,
The second sealing surface 28 of the valve member 16 opens the second lead-out passage 27. At this time, since the fluid pressure on the inlet 4 side is low,
The coil spring 24 expands by overcoming the fluid pressure on the inlet 4 side, and moves the temperature control element 9 away from the first outlet path 7,
The first sealing surface 26 of the lower wall member 17 opens the first outlet path 7. As a result, a large amount of low temperature fluid
It is quickly discharged from the outlet path 7.

When the fluid pressure on the inlet 4 side increases due to the discharge of the low-temperature fluid, the coil spring 24 is contracted by the fluid pressure on the inlet 4 side, and the temperature control element 9 is seated on the first outlet path 7. The first seal surface 26 of the lower wall member 17 is the first seal surface.
The outlet path 7 is closed. 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 lower wall member 17. When the valve member 16 is seated on the lower wall member 17, the second seal surface 28 of the valve member 16 closes the second outlet passage 8. This prevents vapor leakage.

[0015]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
A large amount of low-temperature fluid can be quickly discharged by opening a large-diameter outlet passage at the time of starting.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a thermally responsive steam trap of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper casing 2 Lower casing 3 Valve room 4 Inlet 5 Outlet 7 1st outlet 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 Coil spring 26 first seal surface 27 second outlet path 28 second seal surface 30 fluid passage

Claims (1)

[Claims] 1. An inlet, a valve chamber, and an outlet are formed in a valve casing, a first outlet passage having a large diameter is formed between the valve chamber and the outlet, and an outer peripheral edge of a diaphragm is formed between upper and lower wall members. The temperature control element having the expansion member sealed between the upper wall member and the diaphragm and the valve member attached to the diaphragm is disposed in the valve chamber, and the inner peripheral wall of the valve casing and the outer periphery of the temperature control element are disposed. A spring member is provided for seating the temperature control element in the first lead-out path during normal operation and separating the temperature control element from the first lead-out path at the time of startup, to the first lead-out path of the temperature control element. A first seal surface for closing the first lead-out path at the time of seating is formed on the lower wall member, and a fluid passage hole is formed outside the first seal surface of the lower wall member, and the first seal surface of the lower wall member is formed. Small diameter second inside seal surface
A thermally responsive steam trap, wherein a second sealing surface for forming a lead-out passage and closing the second lead-out passage when the valve member is seated on a lower wall member is formed in the valve member.