JPH0637274Y2 - Pilot steam trap - Google Patents

Description

TECHNICAL FIELD The present invention relates to a steam trap for automatically discharging condensate generated in a steam piping system, and in particular, opening and closing a pilot valve that assists the pressure in a pressure chamber in which a piston is arranged. The present invention relates to a pilot type steam trap which is controlled by an action to drive a piston to open and close a main valve opening.

2. Description of the Related Art This pilot type steam trap is disclosed in
-112490 publication. In this, a piston is arranged in the pressure chamber, and the pressure chamber is formed by the piston into the first pressure chamber and the second pressure chamber.
The pressure chamber is airtightly divided, the first pressure chamber is communicated with the outlet, the pilot valve opening / closing by the auxiliary pilot valve is communicated with the second pressure chamber, and the first pressure chamber and the second pressure chamber are communicated with each other. A fine hole is provided in a piston, and a main valve body that opens and closes a main valve opening is connected to the piston.

Problems to be Solved by the Invention In the above, when the piston is displaced downward and pushes down the main valve body, it is pushed up due to the condensed water ejected from the main valve opening, and the opening degree of the main valve opening is increased. However, there was a problem that the flow rate was reduced and the discharge flow rate was reduced, and the on-off valve was frequently repeated.

Therefore, the technical problem of the present invention is to prevent the piston from being pushed up by the condensate when it is displaced downward.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to arrange a piston in a pressure chamber, and use the piston to divide the pressure chamber into a first pressure chamber and a second pressure chamber. Airtight partition, first
The pressure chamber is communicated with the outlet, and the pilot valve port opened and closed by the auxiliary pilot valve is communicated with the second pressure chamber.
The piston is provided with a small hole that connects the pressure chamber and the second pressure chamber,
A main valve body for opening and closing a main valve opening is connected to a piston, and a partition wall is provided between the piston and the main valve body.

Condensate ejected from the main valve port hits the partition wall and flows out to the outlet. Therefore, the piston is not greatly pushed up by the condensate to be ejected, is largely displaced toward the main valve opening side, and the main valve body is separated from the main valve seat, so that the opening degree of the valve opening can be further increased.

Effect of the Invention The present invention has the following unique effects.

Since the piston can be largely displaced toward the main valve port side, the discharge flow rate becomes large. Also, since the main valve body does not repeat opening and closing frequently, wear of the sliding contact parts such as the piston and the cylinder, the main valve body and the main valve seat, etc. is less, and the desired good operation is maintained for a long time. It

Example An example showing a specific example of the above technical means will be described (see FIG. 1).

The lid members 2 and 3 are fastened to the main body 1 with bolts to form a trap casing. Partition wall 4 inside the trap casing
Is separated into a condensate reservoir chamber 6 communicating with the inlet 5 and a pressure chamber 8 communicating with the outlet 7. The inlet 5 opens at the upper part of the condensate pool chamber 6 and communicates with it via a screen 9. An outlet 7 is formed on the same axis as the inlet 5.

A cylinder 10 is arranged in the pressure chamber 8. A main valve seat 11 is formed at the lower end of the cylinder 10, and the condensate reservoir chamber 6 and the pressure chamber 8 are communicated with each other through a main valve opening 12 opened therein.

A piston (13) is slidably arranged in the cylinder (10). The lower part of the piston 13 forms a first pressure chamber 14 and the upper part forms a second pressure chamber 15. The first pressure chamber 14 and the second pressure chamber 15 are communicated with each other through a fine hole 16 formed in the piston 13.

A connecting rod 17 extending downward is integrally formed with the piston 13.
A main valve body 18 that opens and closes the main valve opening 12 from the side of the condensate storage chamber 6 is attached with a nut 19. The main valve body 18 is biased by a spring 20 in the valve closing direction.

A partition wall 21 is provided between the piston 13 and the main valve body 18. In this embodiment, it is formed integrally with the cylinder 10. A communication hole 22 is opened at the center of the partition wall 21, and a connecting rod 17 penetrates therethrough.

A spherical pilot float 23 is accommodated in the condensate sump chamber 6 in a free state, and the float 23 floats and descends according to the liquid level in the condensate sump chamber 6 and is screwed to the partition wall 4 at the bottom of the condensate sump chamber 6. The seat is separated from or seated on the combined pilot valve seat 24. The pilot valve seat 24 forms an opening on the side of the condensate reservoir chamber 6 of the pilot valve port 25 that connects the condensate reservoir chamber 6 to the second pressure chamber 15.

The operation of the above embodiment is as follows.

When the amount of condensate flowing in from the inlet 5 is very small or absent, the float 23 descends to block the pilot valve port 25, and the second pressure chamber
Since the pressure in 15 escapes from the fine hole 16 to the outlet 7 side through the communication hole 22, the piston 13 is pushed up by the pressure on the inlet side acting on the main valve body 18 and the elastic force of the spring 20, and the main valve body 18 is closed. mouth
Blocking 12 Next, when a large amount of condensate flows in from the inlet 5, the float 23 rises as the liquid level in the condensate reservoir chamber 6 rises, and the pilot valve port 25 is opened. The pressure in the second pressure chamber 15 rises to push down the piston 13, the main valve body 18 opens the main valve opening 12, and the condensed water from the inlet 5 is discharged to the outlet 7.

[Brief description of drawings]

FIG. 1 is a sectional view of a pilot type steam trap according to an embodiment of the present invention. 1: Main body, 5: Inlet 6: Condensate chamber, 7: Outlet 8: Pressure chamber, 10: Cylinder 12: Main valve port, 13: Piston 14: First pressure chamber, 15: Second pressure chamber 16: Thin Hole, 18: Main valve body 21: Partition wall, 23: Float 25: Pilot valve opening

Claims (1)

[Scope of utility model registration request] 1. A piston is arranged in a pressure chamber, the pressure chamber is airtightly divided into a first pressure chamber and a second pressure chamber by the piston, the first pressure chamber is communicated with an outlet, and the auxiliary pilot valve opens and closes. A pilot valve opening is connected to the second pressure chamber, a fine hole that connects the first pressure chamber and the second pressure chamber is provided in the piston, and the main valve body that opens and closes the main valve opening is connected to the piston. Pilot type steam trap with partition wall between piston and main valve.