JPH0637275Y2 - Pilot steam trap - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention relates to a steam trap for automatically discharging condensate generated in a steam piping system, and particularly to a pressure detected by detecting the liquid level on the inlet side by a pilot float valve. The present invention relates to a pilot-type steam trap that drives a response valve.

This type of pilot steam trap has a pressure chamber partially formed by a pressure receiving displacement wall of a pressure responsive valve, a first orifice for communicating the pressure chamber with an inlet side, and a second orifice for communicating the pressure chamber with an outlet side. It comprises an orifice and a pilot float valve that opens and closes the first orifice according to the liquid level on the inlet side to introduce condensed water into the pressure chamber to control the pressure and drive the pressure responsive valve.

In the above, in order to prevent the pressure-responsive valve from causing a delay in closing the valve, that is, in order for the pressure-responsive valve to close instantly after the pilot float valve closes the first orifice, It is necessary to form the opening area of the second orifice as large as possible. However, if the second orifice is made large, the pressure responsive valve cannot be opened because the pressure escape from the second orifice is large even if the pilot float valve is fully opened.

Conventional Technology Therefore, conventionally, a technology as disclosed in Japanese Utility Model Publication No. 53-746 has been used. This is such that the second orifice formed in the pressure responsive valve is opened only when the pressure responsive valve is in the open state.

Since the second orifice opened in the pressure responsive valve is in the fully open state immediately after the pilot float valve closes the first orifice, the pressure in the pressure chamber can be instantaneously released to the outlet side. The valve can be closed instantly.

SUMMARY OF THE INVENTION However, in the above-mentioned one, when the pilot float valve is opened to open the first orifice and the pressure responsive valve in the closed state is to be opened, the second orifice is Since it is closed, the pressure responsive valve will open even if the pilot float valve is slightly open. This means that the pressure responsive valve will open frequently even if the amount of condensate inflow is small and the condensate can be discharged only by opening and closing the pilot float valve, which shortens the life of the pressure responsive valve. It may lead to steam leaks.

Therefore, the technical problem of the present invention is to prevent the pressure responsive valve from causing a delay in closing the valve and to prevent the pressure responsive valve from opening when the amount of condensate inflow is small.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems include a pressure chamber partially formed by a pressure receiving displacement wall of a pressure responsive valve, and a pressure chamber on the inlet side. A first orifice communicating with the first orifice, a second orifice communicating the pressure chamber with the outlet side, and a first orifice
A pilot float valve that opens and closes the orifice according to the liquid level on the inlet side and introduces condensate into the pressure chamber to control the pressure to drive the pressure responsive valve. A valve member for opening and closing the orifice is connected to the first orifice and the second orifice by the pilot float valve.
I made the opening and closing valve operation of the orifice reverse.
It is a thing.

Action The action of the above technical means is as follows.

When the pilot float valve opens the first orifice, the second orifice is closed, and conversely, when the first orifice is closed, the second orifice is opened. That is, when the opening of the first orifice is large, the opening of the second orifice is small, and conversely, when the opening of the first orifice is small, the opening of the second orifice is large. Therefore, immediately after the pilot float valve closes the first orifice, the second
Since the orifice is fully opened, the pressure in the pressure chamber can be instantaneously released to the outlet side, and the pressure responsive valve can be instantaneously closed. Further, when the pilot float valve is opened to slightly open the first orifice, the opening of the second orifice is large and the pressure responsive valve does not open. Then, as the pilot float valve opens the first orifice larger, the opening of the second orifice becomes smaller, the pressure in the pressure chamber rises, and the pressure responsive valve opens.

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

The lid member 2 is fastened to the main body 1 with bolts (not shown) to form a trap casing. The inside of the trap casing is a partition wall 3, and a condensate reservoir chamber 5 and an outlet 6 communicating with an inlet 4 are provided.
Is separated from the pressure responsive valve accommodating chamber 7 communicating with The inlet 4 and the outlet 6 are coaxially formed in the upper part of the casing.

A cylinder member 8 and a piston member 9 slidably arranged in the cylinder member 8 are arranged in the pressure responsive valve storage chamber 7. A lid member 10 is fastened to the partition wall 3 with a bolt (not shown) to form a pressure chamber 11 between the upper surface of the piston member 9 and the lid member 10. The lid member 10 is formed with a first orifice 12 which communicates the condensate pool chamber 5 and the pressure chamber 11, and the lid member 10 and the partition wall 3 are formed with a second orifice 13 which communicates the pressure chamber 11 and the outlet 6.

The main valve element 14 is fixed to the lower end of the piston member 9 with a nut 15. The main valve body 15 is interlocked with the piston member 9 and the condensed water chamber 5
The valve port 16 communicating with the outlet 6 is opened and closed. The valve port 16 is formed at the lower end of the cylinder member 8. The main valve body 14 is biased by a spring 17 toward the valve port 16. The cylinder member 8 has an opening 18 for flowing the liquid flowing out from the valve port 16 to the outlet 7.
Has been opened. The piston member 9 and the main valve body 14 form a pressure responsive valve.

A spherical pilot float 19 is arranged in the condensate chamber 4. A lever 20 is connected to the pilot float 19, and the lever 20 is attached to the lid member 10 with a pin 21. Therefore, the pilot float 19 can rotate about the pin 21 as a fulcrum. First opening / closing of the first orifice 12 on the lever 20
A second valve body 23 that opens and closes the valve body 22 and the second orifice 13 is attached. The second valve body 23 is connected to the lever 20 by a chain 24. The pilot float 19 floats and descends while rotating around the pin 21 as a fulcrum according to the liquid level in the condensate reservoir chamber 5.
When floated, the first valve body 22 opens the first orifice 12 and the second valve body 23 closes the second orifice 13. When descending, the first valve body 22 closes the first orifice 12,
The second valve body 23 opens the second orifice 13. When the opening of the first orifice 12 increases, the opening of the second orifice 13 decreases, and conversely, when the opening of the first orifice 12 decreases, the opening of the second orifice 13 increases.

The operation of the above embodiment is as follows.

When the amount of condensed water flowing in from the inlet 4 is very small or absent, the pilot float 19 descends to block or slightly open the first orifice 12 with the first valve body 22. At this time, the second
Since the orifice 13 is largely opened by the second valve body 23, the pressure in the pressure chamber 11 becomes equal to that of the outlet 6, and the piston member 9 causes the inlet side pressure acting on the main valve body 14 and the elastic force of the spring 17. Is closing valve opening 16. Next, when a large amount of condensate flows in from the inlet 4, the pilot float 19 largely floats as the liquid level in the condensate reservoir chamber 5 rises, and the first valve body
22 greatly opens one orifice 12. At this time, since the second valve body 23 has the second orifice 13 with a small opening degree or is fully closed, the pressure in the pressure chamber 11 rises and pushes down the piston member 9, so that the main valve body 14 opens the valve opening. Open 16 and discharge the condensate from the inlet 4 to the outlet 6.

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

As described above, according to the present invention, the pressure responsive valve does not cause a delay in closing the valve, so that steam is not leaked. Further, when the amount of condensate inflow is small, the pressure responsive valve does not open, so that the sliding portion of the pressure responsive valve is less worn, and the desired good operation is maintained for a long time.

[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, 4: Inlet 5: Condensate reservoir chamber, 6: Outlet 9: Piston member, 11: Pressure chamber 12: First orifice, 13: Second orifice 14: Main valve body, 16: Valve port 19: Pilot Float 22: 1st valve body, 23: 2nd valve body

Claims (1)

[Scope of utility model registration request] 1. A pressure chamber, a part of which is formed by a pressure receiving displacement wall of a pressure responsive valve, a first orifice for communicating the pressure chamber with an inlet side, a second orifice for communicating the pressure chamber with an outlet side, 1
A pilot float valve that opens and closes the orifice according to the liquid level on the inlet side and introduces condensate into the pressure chamber to control the pressure to drive the pressure responsive valve. A valve member for opening and closing the orifice is connected to the first orifice and the second orifice by the pilot float valve.
A pilot-type steam trap in which the opening and closing valve operation of the orifice is reversed.