JPH07167388A - Thermally-actuated steam trap - Google Patents

Abstract

PURPOSE:To provide a thermally actuated steam trap without the generation of steam leakage by enabling complete closure even if a valve member is seated in the inclined state non-parallel to the valve hole face. CONSTITUTION:An inlet 2, a valve chamber 4 and an outlet 3 are formed at a casing formed of a body 1 and a cover member 5, and the valve chamber and the outlet are communicated with each other by a valve hole 8 opened at a valve seat member 9. A temperature control element 10 formed of an upper wall member 12, a diaphragm 15, an expansion medium 16 accommodated between the upper wall member 12 and the diaphragm 15, and a valve member 17 connected to the diaphragm 15 is accommodated in the bottomed cylindrical fitting member 21 fixed between the body 1 and the valve seat member 9. The center of a corrugated plate spring 20 is locked to the plug member 13 of the temperature control element 10 loosely in the slip-off prevented state. The outer periphery of the corrugated plate spring 20 is held into the fitting member 21 by snap rings 22, 23, and the temperature control element is suspended by the corrugated plate spring 20.

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 particularly to a temperature including a medium which is expanded when heated and contracted when cooled. The present invention relates to a heat-actuated steam trap that uses a control element to discharge fluid below a desired temperature to the outside of the system.

[0002]

2. Description of the Related Art A heat-actuated steam trap using a temperature control element is disclosed in, for example, Japanese Patent Publication No. 60-46318. As can be understood from the publication, a temperature control including a wall member, a diaphragm member, an expansion medium housed between both members, and a valve member connected to the diaphragm, which forms an inlet, a valve chamber, and an outlet by casing. The element is fixed in the valve chamber, and the valve member is driven by the displacement of the diaphragm due to the expansion and contraction of the expansion medium to open and close the valve port formed at the opening end of the outlet on the valve chamber side.

[0003]

When a high temperature fluid having a temperature higher than a predetermined temperature flows into the valve chamber, the expansion medium expands, the diaphragm is displaced in the valve closing direction, and the valve member closes the valve port. This prevents the discharge of steam. When a low temperature fluid below a predetermined temperature flows in, the expansion medium contracts, the diaphragm is displaced in the valve opening direction, and the valve member opens the valve port. As a result, condensed water and air are discharged outside the system.

However, the heat-actuated steam trap of this type has a problem that the valve cannot be completely closed to cause vapor leakage. This is because when the diaphragm is displaced in the valve closing direction by the expansion of the expansion medium, the valve member approaches in a state in which the valve member is not parallel to the valve opening surface and is seated on the valve opening surface in this tilted state. This is because the valve opening may not be completely closed.

Therefore, a technical problem of the present invention is that the valve member can be completely closed even if it is seated in a state of being tilted so as not to be parallel to the valve opening surface, so that a steam responsive type steam-actuated type steam valve which does not cause steam leakage. It is to provide a mutrap.

[0006]

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 by casing, and to form a wall member and a diaphragm member. A temperature control element consisting of an expansion medium housed between the members and a valve member connected to the diaphragm is arranged in the valve chamber, and the valve member is driven by the displacement of the diaphragm due to the expansion and contraction of the expansion medium to drive the valve chamber side of the outlet. In the one for opening and closing the valve port formed at the opening end, the temperature control element is hung by a spring.

[0007]

The operation of the above technical means is as follows.
When the diaphragm is displaced in the valve closing direction due to the expansion of the expansion medium, the valve member approaches in a tilted state that is not parallel to the valve opening surface, and even if the valve member is seated on the valve opening surface in this tilted state, the Since the temperature control element that has been hung down can be tilted as a whole, the valve member comes into close contact with the valve opening and is completely closed.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). An inlet 2 and an outlet 3 are formed on the main body 1 on the same axis, and a valve chamber 4 communicating with the inlet 2 and the outlet 3 is fastened to the main body 1 by a bolt (not shown).
Formed by. A casing is constituted by the main body 1 and the lid member 5, and the airtightness between them is an annular gasket 6.
Kept in. A screen 7 is provided on the passage extending from the inlet 2 to the valve chamber 4 to trap foreign matter such as dust. Exit 3
A valve seat member 9 having a valve port 8 that connects the valve chamber 4 and the outlet 3 is screwed to the opening end of the valve chamber 4 side.

A temperature control element 10 is arranged above the valve seat member 9. The temperature control element 10 includes an upper wall member 12 having an inlet 11, and a spherical plug member 1 for sealing the inlet 11.
3, a diaphragm 15 that forms a storage chamber 14 between the upper wall member 12, and an expansion medium 16 that is sealed in the storage chamber 14.
A valve member 17 that is fixed to the diaphragm 15 and is seated on and off the valve seat member 9 to open and close the valve port 8, and a lower wall member 18 that is fixed by sandwiching the outer peripheral edge of the diaphragm 15 with the upper wall member.
And a stopper 19 fixed to the upper wall member 12. The expansion medium 16 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof.

On the upper wall member 12, the injection port 11 is provided at the center.
The corrugated plate spring 20 having a hole slightly larger than the diameter of the plug member 13 and slightly smaller than the diameter of the plug member 13 is placed and loosely locked by the plug member 13 welded to the inlet 11 so as not to come off. The temperature control element 10 and the corrugated leaf spring 20 are housed in a bottomed cylindrical mounting member 21 that is fixed by being sandwiched between the main body 1 and the valve seat member 9.
It is held by snap rings 22 and 23. The outer diameter of the temperature control element 10 is smaller than the inner diameter of the mounting member 21 and can be tilted inside the mounting member 21. Two condensate passage windows 24 are formed on both sides of the lower portion of the attachment member 21.

The operation of this embodiment is as follows. When a high temperature fluid flows into the valve chamber 4 from the inlet 2, the expansion medium 16 expands and displaces the valve member 17 downward through the diaphragm 15, so that the valve member 17 is seated on the valve seat member 9 to open the valve opening. 8 is closed to prevent steam leakage. Even if the valve member 17 is tilted when it is seated on the valve seat member 9 due to the expansion of the expansion medium 16, the temperature control element 10 suspended by the corrugated leaf spring 20 can be tilted as a whole. The member 17 is in close contact with the valve opening 8 and can be completely closed. On the other hand, when the fluid temperature becomes lower than a predetermined value due to heat radiation or when a low temperature fluid flows in from the inlet 2, the expansion medium 16 contracts and the valve member 17 also applies the fluid pressure of the inlet 2 to the valve seat member 9 from the valve seat member 9. I was made to sit apart and opened the valve opening 11,
The low temperature condensate and air are discharged from the outlet 3.

[0012]

The present invention produces the following unique effects. As described above, according to the present invention, since the valve member can be completely closed even if it is seated in a state of being tilted in a direction not parallel to the valve opening surface, it is possible to completely prevent steam leakage and save energy. Become.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Main Body 2 Inlet 3 Outlet 4 Valve Chamber 5 Lid Member 8 Valve Port 9 Valve Seat Member 10 Temperature Control Element 11 Injection Port 12 Upper Wall Member 13 Plug Member 15 Diaphragm 16 Expansion Medium 17 Valve Member 20 Corrugated Leaf Spring 21 Mounting Member 22 , 23 snap ring

Claims (1)

[Claims] 1. A valve for a temperature control element comprising an inlet, a valve chamber and an outlet formed by casing, and comprising a wall member, a diaphragm member, an expansion medium housed between the members, and a valve member connected to the diaphragm. In a device which is arranged in a chamber, the valve member is driven by the displacement of the diaphragm caused by the expansion and contraction of the expansion medium to open and close the valve port formed at the opening end on the valve chamber side of the outlet,
A thermo-responsive steam trap characterized by a temperature control element suspended with a spring.