JPH112396A - Thermally responding steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a device to quickly discharge a large amount of low temperature fluid. SOLUTION: Between upper/lower wall members 13, 18, a peripheral edge of a diaphragm 15 is secured, between the upper wall member 13 and the diaphragm 17, an expansion medium 19 is sealed, a temperature control element 10 mounting a valve member 17 in the diaphragm 15 is arranged in a valve chamber 3. In the periphery of the temperature control element 10, a fluid passing passage 27 is formed. In the temperature control element 10, a fluid passing hole 22 is formed to penetrate the upper wall member 13, diaphragm 15 and the valve member 17. A lead-through path 9 of passage area larger than the fluid passing hole 22 is formed in a partition member 6 between the valve chamber 3 and an outlet 4. A coil spring 25 is provided, which seats the lower wall member 18 in the partition member 6 at normal operation time and separates the member 18 from the partition member 6 at starting time. A first seal part 28 closing a flow in the lead-through path from the fluid passing passage, when the lower wall member 18 is seated in the partition member 6, is formed between the lower wall member 18 and the partition member 6. A second seal part 29 closing a flow in the lead-through path from the fluid passing hole, when the valve member 17 is seated in the partition member 6, is formed between the valve member 17 and the partition member 6.

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]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form an inlet, a valve chamber and an outlet in a valve casing, and to form the upper and lower wall members. An outer peripheral edge of the diaphragm is fixed between the upper wall member and the diaphragm, and an expansion medium is sealed between the upper wall member and the diaphragm, and a temperature control element having a valve member attached to the diaphragm is disposed in the valve chamber. A fluid passage is formed between the outer circumference of the control element and a fluid passage hole formed through the upper wall member, the diaphragm and the valve member in the temperature control element, and the passage area is larger than the fluid passage hole. A spring member for forming a lead-out path communicating the chamber and the outlet in a partition member between the valve chamber and the outlet, and seating the lower wall member of the temperature control element on the partition member during normal operation and separating from the partition member at startup. A fluid passage passage is provided when the lower wall member is seated on the partition member. A first seal portion for closing the flow from the fluid passage to the outlet passage is formed between the lower wall member and the partition wall member. A heat-sensitive steam trap is provided in which a second seal portion for closing a flow is formed between a valve member and a partition member.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS At the time of starting, since the fluid pressure is low at the inlet side, the spring member overcomes the fluid pressure at the inlet side to separate the lower wall member of the temperature control element from the partition wall member, and the fluid passage passage. And the outlet route. At this time, the temperature inside the valve chamber is low,
The expansion medium of the temperature control element contracts, the valve member is separated from the partition member, and the fluid communication hole communicates with the outlet passage. Thus, a large amount of low-temperature fluid is quickly discharged from the fluid passage and the fluid passage hole to the outlet through the outlet passage having a large passage area.

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 lower wall member of the temperature control element is seated on the partition wall member, and A first seal formed between the member and the partition member closes the flow from the fluid passage to the outlet. Further, when the temperature in the valve chamber rises due to discharge of the low-temperature fluid, the expansion medium of the temperature control element expands, the valve member sits on the partition member, and the second member formed between the valve member and the partition member. ―
The valve part closes the flow from the fluid passage hole to the outlet path. This prevents leakage of steam. When the temperature in the valve chamber lowers, the expansion medium of the temperature control element contracts, the valve member is separated from the partition member, and the fluid passage hole communicates with the outlet passage. Thereby, the low-temperature fluid is discharged from the fluid passage hole to the outlet through the outlet path.

[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. A disk portion 8 is formed on the central axis of the partition member 6 between the valve chamber 3 and the outlet 5 via a plurality of ribs 7. Each of the ribs 7 forms an outlet passage 9 having a large passage area for communicating the valve chamber 3 and the outlet 5.

A temperature control element 10 is arranged in the valve chamber 3. The temperature control element 10 includes an upper wall member 13 having a central opening 11 and an inlet 12, a diaphragm 15 having a central opening 14, and a valve member 17 having a central opening 16.
, Lower wall member 18, upper wall member 13 and diaphragm 15
And the expansion medium 19 enclosed between them.

The diaphragm 15 and the valve member 17 are welded (reference numeral 20) with their respective central openings 14, 16 arranged side by side.
The edge of the central opening 11 of the upper wall member 13 and the diaphragm 1
The edge of the central opening 14 of FIG. 5 is welded (reference numeral 21), and the central openings 11, 14, 16 form a fluid passage hole 22 penetrating the upper wall member 13, the diaphragm 15 and the valve member 17. Upper wall member 13, diaphragm 15, lower wall member 18
Are welded (reference number 23). The inlet 12 is provided in a closed space between the upper wall member 13 and the diaphragm 15.
, The expansion medium 19 is injected and the plug member 24 is closed. The expansion medium 19 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof.

The temperature control element 10 is urged upward by a coil spring 25 disposed between the lower casing 2 and the lower wall member 18. The coil spring 25 is extended at the start when the fluid pressure on the inlet 4 side is low, and lifts the temperature control element 10 to lower the lower wall member 1.
8 is separated from the partition member 6. The coil spring 25
During normal operation when the fluid pressure on the inlet 4 side is high, the lower wall member 18 of the temperature control element 10 is seated on the partition wall member 6. The outer periphery of the temperature control element 10 is guided by a plurality of ribs 26 formed on the inner periphery of the lower casing 2. The space between the ribs 26 forms a fluid passage 27. Temperature control element 10
The first seal portion 28 for closing the flow from the fluid passage 27 to the outlet passage 9 when the lower wall member 18 is seated on the partition member 6.
Is formed between the lower wall member 18 and the partition wall member 6. When the valve member 17 of the temperature control element 10 is seated on the partition member 6, the second seal portion 29 for closing the flow from the fluid passage hole 22 to the outlet passage 9 is provided with a disc portion of the valve member 17 and the partition member 6. 8 is formed.

At the time of starting, since the fluid pressure is low at the inlet 4 side,
The coil spring 25 overcomes the fluid pressure on the inlet 4 side to separate the lower wall member 18 of the temperature control element 10 from the partition wall member 6,
The fluid passage 27 communicates with the outlet 9. At this time, the temperature in the valve chamber 3 is low, and the expansion medium 19 of the temperature control
Is contracted, the valve member 17 is separated from the partition member 6, and the fluid passage hole 22 communicates with the outlet passage 9. Thereby, a large amount of low-temperature fluid is quickly discharged from the fluid passage 27 and the fluid passage hole 22 to the outlet 5 through the outlet passage 9 having a large passage area.

When the fluid pressure on the inlet 4 side increases due to the discharge of the low-temperature fluid, the coil spring 25 is deformed by the fluid pressure on the inlet 4 side, and the lower wall member 18 of the temperature control element 10 is attached to the partition wall member 6. When seated, the first seal portion 28 formed between the lower wall member 18 and the partition wall member 6 forms the fluid passage 27.
From the outlet to the outlet path 9 is closed. When the temperature inside the valve chamber 3 rises due to the discharge of the low-temperature fluid, the expansion medium 19 of the temperature control element 10 expands, and the valve member 17
And the second seal portion 29 formed between the valve member 17 and the partition member 6 closes the flow from the fluid passage hole 22 to the outlet passage 9. This prevents leakage of steam. When the temperature in the valve chamber 3 decreases, the expansion medium 19 of the temperature control element 10 is increased.
Is contracted, the valve member 17 is separated from the partition member 6, and the fluid passage hole 22 communicates with the outlet passage 9. Thereby, the low-temperature fluid is discharged from the fluid passage hole 22 to the outlet 5 through the outlet passage 9.

[0015]

The present invention has the following specific effects. As described above, the thermally responsive steam trap according to the present invention comprises:
At the time of startup, a large amount of low-temperature fluid can be quickly discharged from the fluid passage and the fluid passage through the outlet passage having a large passage area.

[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 6 Partition member 9 Outgoing route 10 Temperature control element 13 Upper wall member 15 Diaphragm 17 Valve member 18 Lower wall member 19 Expansion medium 22 Fluid passage hole 25 Coil Spring 27 Fluid passageway 28 First seal part 29 Second seal part

Claims (1)

[Claims] 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 sealed between the upper wall member and the diaphragm. A temperature control element having a valve member attached thereto is disposed in the valve chamber, a fluid passage is formed between an inner peripheral wall of the valve casing and an outer periphery of the temperature control element, and an upper wall member is formed on the temperature control element. A fluid passage hole is formed by penetrating the diaphragm and the valve member, and an outlet path having a passage area larger than the fluid passage hole and communicating the valve chamber and the outlet is formed in the partition member between the valve chamber and the outlet,
A spring member is provided for seating the lower wall member of the temperature control element on the partition member during normal operation and separating from the partition member at startup,
A first seal portion for closing a flow from the fluid passage to the lead-out passage when the lower wall member is seated on the partition member is formed between the lower wall member and the partition member, and a partition of the valve member of the temperature control element is formed. The second for closing the flow from the fluid passage hole to the outlet path when seated on the member
A thermally responsive steam trap wherein a seal portion is formed between a valve member and a partition member.