JP2709543B2 - Large capacity 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 a steam-using apparatus, and more particularly to a steam trap capable of discharging a large volume of condensate.
The steam trap must discharge the condensate condensed by the work of steam quickly without stagnation and without leaking the steam. Further, in a device using a large amount of steam, a large amount of condensate is generated, and this large amount of condensate must be discharged quickly.

[0002]

2. Description of the Related Art Conventionally, a steam trap as disclosed, for example, in Japanese Patent Publication No. 62-6153 has been used. This uses a float valve that rises and falls according to the inflow of condensate water as a pilot valve, and
By connecting a piston valve of relatively large diameter with a piston valve of relatively large diameter,
When condensate flows in and the pilot float valve opens, the large-diameter piston valve opens to discharge a large amount of condensate.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
There was a problem that the structure was complicated and the shape became large. This is because a plurality of valves and valve seat mechanisms such as a pilot valve and a pilot valve seat corresponding to the valve, a piston valve and a piston valve seat are required. If the structure is complicated and the shape becomes large, the probability of occurrence of a failure increases, and the price as a product becomes expensive.

[0004] Therefore, the technical problem of the present invention is that a plurality of valves
An object of the present invention is to provide a large-capacity steam trap having a simple structure and a small size without requiring a valve seat mechanism.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is a trap case.
An inlet, a valve chamber, and an outlet are formed by singing, and a plate-shaped valve member and a valve seat section that define the inlet and the outlet in the valve chamber are arranged to face each other,
At least one double cylindrical bellows is disposed at one end of a valve member, a thermal expansion medium is sealed in the bellows, and a communication hole communicating an inner circumference of the bellows and an inlet is provided. It is.

[0006]

The operation of the above technical means is as follows.
If the temperature of the condensate from the entrance to the inside of the bellows is low,
Since the thermal expansion medium sealed in the bellows does not expand,
By the inlet side fluid, the valve member is separated from the valve seat and discharges the condensed water to the outlet. When the temperature of the inflow condensate rises, the thermal expansion medium expands and the bellows expands,
A valve member disposed at one end is seated on the valve seat to prevent the steam from leaking to the outlet side. In this case, the valve-opening force acting on the valve member due to the inlet-side fluid is almost offset by the fluid pressure reaching the inner periphery of the bellows through the communication hole, so that the displacement force for elongating the bellows is small. It can be downsized.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The body 1 and the lid 10 form a trap case. Inlet 2 and valve room 3 by trap casing
And an outlet 4 are formed. The valve seat member 5 is screwed to a mounting screw provided on the main body 1 in the valve chamber 3. The valve seat member 5 has a substantially columnar shape and is provided with a seating portion 7 on which the valve member 6 is seated at the upper end.
The valve member 6 has a flat plate shape, and a substantially cylindrical bellows 8,
9 is arranged. The lower ends of the bellows 8 and 9 are attached to the valve member 6 and the upper end is attached to the lid 10 by welding. A space 11 formed by the bellows 8 and 9 is sealed with a thermal expansion medium.
As the thermal expansion medium, a fluid such as alcohol having a boiling point slightly lower than that of water, or a mixture of these fluids is used. By providing a plurality of communication holes 12 and 13 in the valve member 6,
The inner peripheral space 15 of the bellows 9 communicates with the entrance 2. The seal diameter of the seat portion 7 of the valve member 6 is set larger than the inner diameter of the bellows 9. The upper central part of the valve member 6 and the lid 1
A coil spring 16 in a tension state is attached between the lower center of the zero. The coil spring 16 generates an urging force in a direction to separate the valve member 6 from the seat portion 7.

Next, the operation will be described. In the state shown in FIG. 1, the fluid flowing from the inlet 2 is
The pressure reaches the inner peripheral space 15 of the bellows 9 via the inlet 13, and the inlet pressure acting on the valve member 6 is offset by an amount corresponding to the inner peripheral space 15. When the temperature of the condensed water flowing from the inlet 2 is low, the thermal expansion medium in the bellows 8 and 9 does not expand, so that the seal diameter of the seating portion 7 of the valve member 6 is Since the diameter is larger than the inner diameter, the valve member 6 is opened by the fluid pressure, and the condensate is discharged to the outlet 4 side. When the temperature of the fluid flowing from the inlet 2 gradually rises and reaches a desired temperature close to the saturation temperature of the steam pressure,
The thermal expansion medium expands, displacing the valve member 6 downward, and sitting on the seating portion 7, thereby preventing leakage of steam.

[0009]

As described above, according to the present invention, a plurality of valves and valve seat mechanisms such as a pilot valve and a main valve are not required, and the pressure difference between the inlet side and the outlet side acting on the valve member is reduced. The displacement force is offset by the provision of the communication hole and the bellows, so that a large valve member can be opened with a small bellows, simplifying the structure and reducing the shape. it can. In the event that the bellows is damaged and the internal thermal expansion medium flows out, the valve member must be kept open by the fluid on the inlet side and communicate with the outlet through the communication hole and the damaged portion of the bellows. Thus, although there is a leakage of steam, the condensate does not stay at the inlet side of the trap, and the steam use device is not filled with the condensate and becomes unusable.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a large-capacity steam trap according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Inlet 3 Valve room 4 Outlet 5 Valve seat member 6 Valve member 7 Seating part 8,9 Bellows 12,13 Communication hole

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed by trap casing, and a plate-shaped valve member and a valve seat that define the inlet and the outlet are disposed in the valve chamber so as to face each other. A large-capacity steam trap in which a substantially cylindrical bellows is arranged at least in a double form, a thermal expansion medium is sealed in the bellows, and a communication hole communicating an inner periphery of the bellows and an inlet is provided.