JP2932233B2 - Thermo-responsive steam trap - Google Patents

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 temperature trap including a medium which is heated and expanded, cooled and contracted. The present invention relates to a heat-responsive steam trap for discharging a fluid having a temperature lower than a desired temperature out of a system by using a control element.

[0002]

2. Description of the Related Art A thermally responsive steam trap using a temperature control element is disclosed, for example, in Japanese Patent Publication No. 60-46318. As will be understood from the publication, an inlet, a valve chamber, and an outlet are formed by casing, and a temperature control comprising a wall member, a diaphragm member, an expansion medium housed between the two members, and a valve member connected to the diaphragm. An element is fixed in a valve chamber, and a valve member is driven by displacement of a diaphragm due to expansion and contraction of an expansion medium to open and close a valve port formed at an opening end of a valve chamber at an outlet.

[0003]

When a high-temperature fluid having a predetermined temperature or more 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 having a predetermined temperature or less flows, the expansion medium contracts, the diaphragm is displaced in the valve opening direction, and the valve member opens the valve port. As a result, condensate and air are discharged out of the system.

[0004] However, in such a thermoresponsive steam trap of this type, there was a problem that the valve could not be completely closed and a steam leak occurred. This is because when the diaphragm is displaced in the valve closing direction due to the expansion of the expansion medium, the valve member approaches in a non-parallel inclined state with respect to the valve port surface, and may sit on the valve port surface in this inclined state. This is because the valve port cannot be completely closed.

Accordingly, it is an object of the present invention to provide a thermo-responsive steel valve that can be completely closed even when the valve member is seated in a non-parallel inclined state with respect to the valve port surface so that steam leakage does not occur. Is to provide a mechanical trap.

[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 by casing, to form a wall member, a diaphragm member and A temperature control element comprising an expansion medium accommodated between the members and a valve member connected to the diaphragm is disposed in the valve chamber, and the valve member is driven by displacement of the diaphragm due to expansion and contraction of the expansion medium, and the outlet is located on the valve chamber side. The temperature control element can be tilted with a spring when opening and closing the valve port formed at the open end.
It is characterized by being suspended .

[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 non-parallel tilted state with respect to the valve port surface, and even if the valve member is seated on the valve port surface in this tilted state, the spring is used. Since the temperature control element suspended so as to be tiltable can be tilted as a whole, the valve member comes into close contact with the valve port and is completely closed.

[0008]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). An inlet 2 and an outlet 3 are formed on the same axis on the main body 1, and a valve chamber 4 communicating with the inlet 2 and the outlet 3 is connected 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 the two is formed by an annular gasket 6.
Is kept in. A screen 7 is interposed on a passage extending from the inlet 2 to the valve chamber 4 to supplement foreign substances such as dust. Exit 3
A valve seat member 9 having a valve port 8 for communicating the valve chamber 4 and the outlet 3 is screwed to the opening end of the valve chamber 4 on the side of the valve chamber 4.

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 and a diaphragm 15 forming a storage chamber 14 between the upper wall member 12 and an expansion medium 16 sealed in the storage chamber 14
A valve member 17 fixed to the diaphragm 15 and seated on and off the valve seat member 9 to open and close the valve port 8; and a lower wall member 18 fixed to the outer peripheral edge of the diaphragm 15 with the upper wall member interposed therebetween.
And a stopper 19 fixed to the upper wall member 12. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

On the upper wall member 12, the inlet 11 is provided at the center.
A corrugated 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 mounted thereon, and is 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 accommodated in a bottomed cylindrical mounting member 21 fixed and sandwiched between the main body 1 and the valve seat member 9.
It is held by snap rings 22 and 23. The outside diameter of the temperature control element 10 is smaller than the inside diameter of the mounting member 21 and can be inclined inside the mounting member 21. Two condensate passage windows 24 are opened on both sides of the lower part of the mounting 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, displacing the valve member 17 downward through the diaphragm 15, and seating the valve member 17 on the valve seat member 9 to close the valve port. 8 is closed to prevent vapor leakage. Even if the valve member 17 is tilted when 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 spring 20 can be tilted as a whole. The member 17 can be completely closed in close contact with the valve port 8. 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 receives the fluid pressure in the inlet 2 to cause the valve member 17 to move from the valve seat member 9. I was disengaged and opened the valve port 11,
The low-temperature condensate and air are discharged from the outlet 3.

[0012]

The present invention has the following specific effects. As described above, according to the present invention, since the valve member can be completely closed even when seated in a non-parallel inclined state with respect to the valve port surface, it is possible to completely prevent steam leakage and save energy. Become.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Outlet 4 Valve room 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 spring 21 Mounting member 22 , 23 Snap ring

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed by casing, and a temperature control element comprising a wall member, a diaphragm member, an expansion medium contained between the two members, and a valve member connected to the diaphragm is provided by a valve. In a room, the valve member is driven by displacement of a diaphragm due to expansion and contraction of an expansion medium to open and close a valve port formed at a valve chamber side opening end of an outlet,
A thermo-responsive steam trap characterized in that a temperature control element is suspended by a spring so as to be tiltable.