JP2001141189A - Float type drain trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float type drain trap capable of quickly discharging a large quantity of low pressure drain. SOLUTION: A easing having a valve chest 3 at the inside is formed by a main body 1 having an entrance 4, an exit passage 5 and an exit 6 and a cover body 2 fastened with the main body 1. On a lower side wall of the valve chest 3, an opening 7 communicating the valve chest 3 and the exit 6 is provided. On the exit 6 side of the opening 7, a valve seat 10 opening a valve hole 9 is arranged so that the valve seat 10 may be advanced and retreated. On a back face of the valve seat 10, an entrance chamber 12 for leading fluid on the entrance 4 side from the valve chest 3 via a communication path 11 is formed. In the entrance chamber 12, a spring 13 is arranged. Both sides of the spring 13 are connected with a valve seat 10 and a plug 14, respectively, and the valve seat 10 acts as valve opening force for increasing passing area of the opening 7. The valve seat 10 displaces to a plug 14 side at the time of low pressure and increases passing area of the opening 7 and displaces to the valve chest 3 side at the time of high pressure and restricts passing area of the opening 7. Within the valve chest 3, a hollow and spherical float 15 is arranged in a free state. The float 15 opens and closes a valve hole 9 at the time of high pressure when the valve seat 10 restricts passing area of the opening 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam or compressed air and gas piping system by opening and closing a valve hole by driving a valve means with an open or closed float utilizing a specific gravity difference between a gas and a liquid. The present invention relates to a float type drain trap for automatically discharging drain such as generated condensate and condensed water, and particularly to a drain trap having a large drain discharge capacity.

[0002]

2. Description of the Related Art A float type drain trap having a large drain discharge capacity is disclosed, for example, in Japanese Patent Application Laid-Open No. 10-141593. As understood from the publication,
A valve chamber is formed in a casing having an inlet and an outlet, and a valve seat having a valve hole communicating the valve chamber and the outlet is provided at a lower portion of the valve chamber,
A valve member is driven by a float disposed in a valve chamber to open and close a valve hole, and a normally open orifice communicating a valve chamber with an outlet is provided at a lower portion of the valve chamber.

[0003]

The above-mentioned conventional float type drain trap has a large drain discharge capacity and is excellent. However, since the passage area of the orifice is constant, the above-mentioned float type drain trap is particularly difficult at the initial startup of the piping system. As described above, when the fluid pressure on the inlet side is low and a large amount of drain is generated, there is a problem that it takes time to drain the drain.

Accordingly, it is an object of the present invention to provide a float drain trap capable of quickly discharging a large amount of low-pressure drain.

[0005]

The technical means of the present invention taken to solve the above technical problem is to form a valve chamber in a casing having an inlet and an outlet, and to form the valve chamber and the outlet. An opening for communication is provided at the lower part of the valve chamber, and the valve seat is displaceable facing the opening so that the passage area of the opening is increased at low pressure and narrowed at high pressure by the valve closing force by the fluid pressure on the inlet side and the valve opening force by the spring. , A valve hole communicating the valve chamber and the outlet is provided in the valve seat, and a float for opening and closing the valve hole is disposed in the valve chamber.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the float type drain trap of the present invention, when the fluid pressure on the inlet side is low, the valve opening force by the spring overcomes the valve closing force by the fluid pressure on the inlet side to open the valve seat. The passage area of is increased. This allows
A large amount of low-pressure drain is quickly discharged from an opening having a large passage area. When the fluid pressure on the inlet side is high, the valve closing force due to the fluid pressure on the inlet side overcomes the valve opening force by the spring, and the valve seat narrows the passage area of the opening. Then, the float opens and closes the valve hole due to its rising and falling. As a result, the drain is discharged from the opening having a narrow passage area and the opened valve hole. As described above, since the drain is discharged from the opening having a large passage area at the time of low pressure, a large amount of low-pressure drain can be quickly discharged.

[0007]

FIG. 1 is a sectional view showing an embodiment of a float type drain trap according to the present invention. This embodiment is applied to a free float steam trap. The casing of the free-float type steam trap is composed of the main body 1 and the main body 1
And a valve body 3 inside.
The main body 1 has an inlet 4, an outlet passage 5, and an outlet 6, and the inlet 4 communicates with an upper part of the valve chamber 3.

An opening 7 for communicating the valve chamber 3 with the outlet 6 is provided in a lower side wall of the valve chamber 3. A valve seat 10 having a valve hole 9 at the outlet 6 side of the opening 7 is disposed so as to be able to advance and retreat. An inlet chamber 12 for introducing a fluid on the inlet 4 side from the valve chamber 3 via the communication passage 11 is formed on the back surface of the valve seat 10, and a spring 13 is disposed in the inlet chamber 12. The spring 13 has a valve seat 10 and a plug 14 on both sides thereof.
, And the valve seat 10 acts as a valve opening force for increasing the passage area of the opening 7. The valve seat 10 is displaced toward the plug 14 at low pressure to increase the passage area of the opening 7, and is displaced toward the valve chamber 3 at high pressure to reduce the passage area of the opening 7.

A hollow spherical float 15 is disposed in the valve chamber 3 in a free state. The float 15 opens and closes the valve hole 9 when the valve seat 10 narrows the passage area of the opening 7 at a high pressure. The lower part of the valve chamber 3 extends from the opening 7 having a large passage area to the outlet passage 5 at low pressure.
Through the outlet 7 through the outlet passage 5 from the opening 7 having a narrow passage area and the opened valve hole 9 at high pressure.
Communicate with

The operation of the free-float type steam trap of the above embodiment is as follows. When the fluid pressure on the inlet 4 side is low, the valve opening force by the spring 13 overcomes the valve closing force by the fluid pressure on the inlet 4 side, displacing the valve seat 10 to the plug 14 side, and reducing the passage area of the opening 7. I'm making it big. Thus, a large amount of low-pressure drain is quickly discharged from the opening 7 having a large passage area to the outlet 6. When the fluid pressure at the inlet 4 is high, the valve closing force due to the fluid pressure at the inlet 4 overcomes the valve opening force by the spring 13 to displace the valve seat 10 toward the valve chamber 3, and the passage area of the opening 7. Is squeezed. Then, the valve hole 9 is opened and closed by the floating and falling of the float 15. As a result, the drain is discharged from the opening 7 having a narrow passage area and the opened valve hole 9 to the outlet 6. As described above, since the drain is discharged from the opening 7 having a large passage area at the time of low pressure, a large amount of low-pressure drain can be quickly discharged.

In the above embodiment, the present invention is applied to a free-float type steam trap, but can also be applied to a lever-float type steam trap. Further, the present invention can be applied not only to a float type steam trap but also to a float type air trap and a float type gas trap.

[0012]

As described above, according to the present invention, when the fluid pressure on the inlet side is low, the valve opening force by the spring overcomes the valve closing force by the fluid pressure on the inlet side, and the valve seat has the passage area of the opening. Therefore, an excellent effect that a large amount of low-pressure drain can be quickly discharged from an opening having a large passage area is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment in which a float type drain trap of the present invention is applied to a free float type steam trap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Valve room 4 Inlet 6 Outlet 7 Opening 9 Valve hole 10 Valve seat 13 Spring 15 Float

Claims (1)

[Claims] A valve chamber is formed in a casing having an inlet and an outlet, and an opening communicating the valve chamber and the outlet is provided in a lower portion of the valve chamber, and a valve closing force by fluid pressure on an inlet side and a valve opening force by a spring are provided. A valve seat is disposed so as to be displaceable facing the opening so that the passage area of the opening is increased at low pressure and narrowed at high pressure, a valve hole communicating the valve chamber and the outlet is provided in the valve seat, and a float for opening and closing the valve hole is provided. A float type drain trap which is arranged in a valve chamber.