JP2001173891A - 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 the low-temperature drain. SOLUTION: An opening 7 for communicating a valve chamber 3 and an outlet 6 with each other and an ordinary open orifice 16 are provided in a lower side wall of the valve chamber 3. A valve seat 10 provided with a valve hole 9 for communicating the valve chamber 3 and the outlet 6 with each other and provided with a throttle member 17 is provided in the opening 7 and an outlet 6 side of the orifice 16 freely to be moved forward and backward. A back surface of the valve seat 10 is formed with an inlet chamber 12 for leading the fluid of the inlet 4 side from the valve chamber 3 through the communication passage 11 is formed, and a coil-shaped shape memory alloy 13 as a temperature response member is arranged in the inlet chamber 12, and both sides thereof are connected to the valve seat 10 and a plug 14, and the shape memory alloy is shrunken at a low temperature and the valve seat 10 is displaced to the valve chamber 3 so as to open the opening 7, and while passing area of the orifice 16 is increased. The shape memory alloy is extended at a high temperature and the valve seat 10 is displaced to the valve chamber 3 side so as to close the opening 7, and while passing area of the orifice is throttled. A hollow spherical float 15 is arranged in the valve chamber 3 freely to be floated. The float 15 opens and closes the valve hole 9 at a high temperature.

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 a large amount of low-temperature drain is generated, it takes a long time to discharge the drain.

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

[0005]

The technical solution of the present invention 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 and an orifice communicating with each other are provided in the lower part of the valve chamber, and a valve seat having a valve hole communicating the valve chamber and the outlet is disposed so as to be displaceable facing the opening and the orifice. A temperature responsive member was connected to the valve seat to open the opening and increase the passage area of the orifice, close the opening at high temperatures, and reduce the passage area of the orifice at high temperatures, and the float that opens and closes the valve hole was placed in the valve chamber. It is in the characteristic float type drain trap.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a float type drain trap according to the present invention, when a fluid temperature at an inlet side is low, a valve seat opens and an orifice is closed when a fluid temperature at an inlet side is low. The passage area is increased.
As a result, a large amount of low-temperature drain is quickly discharged from the orifice and the opening having a large passage area. When the fluid temperature on the inlet side is high, the valve seat closes the opening and narrows the passage area of the orifice. Then, the float opens and closes the valve hole due to its rising and falling. As a result, the drain is discharged from the orifice having a narrow passage area and the opened valve hole. As described above, when the temperature is low, the drain is discharged from the orifice and the opening having a large passage area, so that a large amount of the low-temperature 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 communicating the valve chamber 3 with the outlet 6 is provided in a lower side wall of the valve chamber 3 and a normally open orifice 16 communicating the valve chamber 3 with the outlet 6 is provided. Opening 7 and orifice 1
A valve hole 9 communicating the valve chamber 3 and the outlet 6 is provided on the outlet 6 side of the valve 6 and a valve seat 10 provided with a throttle member 17 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 through the communication passage 11 from the valve chamber 3 is formed on the back surface of the valve seat 10, and a coil-shaped shape memory alloy 13 as a temperature responsive member is disposed in the inlet chamber 12. . The shape memory alloy 13 has both sides connected to the valve seat 10 and the plug 14, respectively, and contracts at a low temperature to displace the valve seat 10 toward the plug 14 to open the opening 7 in the valve seat 10 and to restrict the valve seat 10. Orifice 16 with member 17
The valve seat 10 is displaced toward the valve chamber 3 by extending at a high temperature, the opening 7 is closed by the valve seat 10, and the passage area of the orifice 16 is reduced by the throttle member 17 of the valve seat 10.

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 at a high temperature when the valve seat 10 closes the opening 7 and narrows the passage area of the orifice 16. The lower part of the valve chamber 3 communicates with the orifice 16 having a large passage area and the opening 7 at the low temperature through the opening 7 through the outlet passage 5 to the outlet 6, and the orifice 16 with a narrow passage area at the high temperature and the exit passage through the opened valve hole 9. It communicates with the outlet 6 through 5.

The operation of the free-float type steam trap of the above embodiment is as follows. When the fluid temperature on the inlet 4 side is low, the shape memory alloy 13 contracts and displaces the valve seat 10 toward the plug 14, and the valve seat 10 opens the opening 7 and increases the passage area of the orifice 16. I have.
As a result, a large amount of low-temperature drain is quickly discharged from the orifice 16 having a large passage area and the opening 7 to the outlet 6. When the fluid temperature on the inlet 4 side is high, the shape memory alloy 1
3 extends to displace the valve seat 10 toward the valve chamber 3, and the valve seat 10
Closes the opening 7 and narrows the passage area of the orifice 16. 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 orifice 16 having a narrow passage area and the opened valve hole 9 to the outlet 6. As described above, when the temperature is low, the drain is discharged from the orifice 16 and the opening 7 having a large passage area, so that a large amount of low-temperature 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 temperature at the inlet side is low, the valve seat opens and the passage area of the orifice is reduced by the temperature responsive member which responds to the fluid temperature at the inlet side. Because of the large size, an excellent effect that a large amount of low-temperature drain can be quickly discharged from the orifice and the 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 chamber 4 Inlet 6 Outlet 7 Opening 9 Valve hole 10 Valve seat 13 Shape memory alloy 15 Float 16 Orifice 17 Throttle member

Claims (1)

[Claims] A valve seat having a valve chamber formed in a casing having an inlet and an outlet, an opening communicating with the valve chamber and the outlet, an orifice provided in a lower portion of the valve chamber, and a valve hole communicating the valve chamber with the outlet. Is disposed so as to be displaceable facing the opening and the orifice,
In response to the fluid temperature on the inlet side, the opening is opened at low temperature and the passage area of the orifice is enlarged, the opening is closed at high temperature and the temperature response member is connected to the valve seat to narrow the passage area of the orifice at high temperature, and the valve hole is opened and closed. A float type drain trap, wherein a floating float is disposed in a valve chamber.