JP2961348B2 - Float type 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 float type steel which drives a valve means by utilizing the floating rise and fall of a float and automatically discharges condensate generated in various steam-using equipment and steam pipes. The present invention relates to a mud trap, and more particularly to an improvement in a valve means having a temperature response function. The float type steam trap is
The valve means is driven by the buoyancy of the float floating on the liquid surface,
Although the valve port formed in the lower part of the valve chamber is opened, the openable valve port area is limited, so a large float must be used to increase the discharge capacity.
Particularly, when the fluid pressure on the inlet side is high, there is a problem that the shape becomes large.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 57-18077 discloses a method in which a valve is provided with a temperature response function for exerting a valve opening force when the temperature of a controlled fluid is low, thereby increasing the discharge capacity without increasing the size. Some are shown in the gazette. As understood from the publication, an inlet, a valve chamber, and an outlet are formed by valve casing, and a valve port communicating the valve chamber with the outlet is formed at the bottom of the valve chamber, and arranged to face the valve port. A valve means comprising a valve element and a bimetal that exerts a force in the valve opening direction on the valve element at a low temperature in accordance with the temperature of the controlled fluid is disposed at the lower portion of the valve chamber. The float is connected to the valve means so as to act, and the valve body opens the valve port by the combined force of the deformation force of the bimetal and the buoyancy of the float.

[0003]

In the above arrangement, if air is trapped in the valve chamber, no buoyancy is generated in the float. Therefore, the valve cannot open the valve port only by the deformation force of the bimetal, and condensate discharge occurs. There is a problem that the function is lost.

[0004] It is therefore a technical object of the present invention to enable the valve means to discharge air.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to form an inlet, a valve chamber and an outlet by valve casing, and to communicate the valve chamber with the outlet. A valve member formed at the bottom of the valve chamber, a wall member, a diaphragm having an outer peripheral edge fixed to the wall member, an expansion medium sealed between the diaphragm and the wall member, the volume of which changes according to the temperature of the controlled fluid, and a valve. It is connected to the diaphragm opposite to the opening, is displaced through the diaphragm according to the volume increase of the expansion medium, closes the valve port, and flows at the inlet side as the volume of the expansion medium decreases.
Displaced through the diaphragm by body pressure
A valve means comprising a valve body having an opening at the valve port is arranged at a lower portion of the valve chamber, and a float which floats up according to the liquid level and lifts up the valve means when the valve means is opened is connected to the valve means. Is what you do.

[0006]

The operation of the above technical means is as follows.
If the temperature of the controlled fluid in the valve chamber is low, the expansion medium is liquefied and the volume is reduced, so that the diaphragm is displaced by the fluid pressure on the inlet side, the valve body opens the valve port, and the air and the return flow are reduced. Drain water. If the valve body opens the valve port,
Since the valve closing force due to the fluid pressure on the inlet side acting on the valve body is small, the float can float, and when the liquid level in the valve chamber is high, the float floats and the valve means is lifted. Pull up, form a sufficient discharge channel between the valve body and the valve port,
Promptly discharge a large amount of condensate. When the liquid level drops due to the discharge of the condensate water, the float lowers to lower the valve means, and the expansion of the expansion medium causes the valve body to close the valve port through the diaphragm.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 to 3). A bottom lid 2 is screwed to the main body 1 to form a valve casing having a valve chamber 3 therein. An inlet 4 is formed at an upper end of the main body 1 and an outlet 5 is formed at a lower end of the bottom cover 2. A valve seat member 7 having a valve port 6 opened is attached to the bottom of the valve chamber 4. A valve means 8 is arranged in the valve chamber 3 so as to face the valve seat 7. The valve means 8 comprises a wall member 1 having an inlet 9.
0, a plug member 11 for sealing the inlet 9, and a lower wall member 12
A diaphragm 13 having an outer peripheral edge welded at an end of the wall member 10 and the lower wall member 12; and a wall member 10 and the diaphragm 1
3, an expansion medium 15 sealed in the storage chamber 14, and the diaphragm 1 so as to open and close the valve port 6.
3 and a stopper 17 fixed to the wall member 10. The expansion medium 15 is formed of water, a liquid having a boiling point lower than that of water, or a mixture thereof. The float 18 is arranged on the valve means 8 and welded to the plug member 11. Reference numerals 19 and 20 are ribs provided on the inner wall of the main body 1.

If the temperature of the controlled fluid in the valve chamber 3 is low, as shown in FIG. 2, the expansion medium 15 is liquefied and its volume is reduced, so that the diaphragm 13 is moved upward by the fluid pressure on the inlet 4 side. The valve body 16 opens the valve port 6 to discharge air and condensate. If the valve body 16 opens the valve port 6, the valve closing force due to the fluid pressure on the inlet 4 acting on the valve body 16 becomes small, so that the float 18 can float and the valve chamber 3 can be lifted. When the liquid level is high,
As shown in (1), the float 18 floats up, pulls up the valve means 8, forms a sufficient discharge flow path between the valve body 16 and the valve port 6, and enables rapid discharge of a large amount of condensate. I do. When the liquid level drops due to the discharge of condensate water, as shown in FIG.
The gate 18 descends to lower the valve means 8. The expansion of the expansion medium 15 causes the valve body 16 to close the valve port 6 via the diaphragm 13 as shown in FIG.

[0009]

The present invention has the following specific effects. As described above, the float type steam trap according to the present invention does not lose the condensate discharge function since the valve means can discharge air. Therefore, the operation efficiency of the equipment using steam does not decrease, and no water hammer occurs.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a valve means of a float type steam trap according to the present invention is closed.

FIG. 2 is a sectional view showing a state in which valve means of the float type steam trap according to the present invention is opened.

FIG. 3 is a cross-sectional view showing a state where the valve means of the float type steam trap according to the present invention is opened and the float is raised.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Bottom cover 3 Valve room 4 Inlet 5 Outlet 6 Valve port 8 Valve means 10 Wall member 13 Diaphragm 15 Expansion medium 16 Valve body 18 Float

Claims (1)

(57) [Claims] 1. A diaphragm having an inlet, a valve chamber, and an outlet formed by valve casing, a valve port communicating the valve chamber with the outlet formed in a bottom of the valve chamber, a wall member, and an outer peripheral edge fixed to the wall member. An expansion medium sealed between the diaphragm and the wall member and having a volume that changes in accordance with the temperature of the controlled fluid; and a valve that is connected to the diaphragm opposite the valve port and is displaced through the diaphragm in accordance with an increase in the volume of the expansion medium. Close mouth and expand medium
Diaphragm due to fluid pressure on the inlet side as the volume of
A valve means comprising a valve body which is displaced via a ram and opens a valve port is disposed in a lower portion of the valve chamber, and floats according to a liquid level when the valve means is opened to lift the valve means. A float type steam trap characterized by being connected to a means.