JP2835673B2 - Float valve - 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 valve for opening and closing a valve port on the outer surface of a float, and more particularly to a valve capable of securely closing the valve port when the valve port is closed. Float valves are used as steam traps for discharging condensed water generated by condensation of steam in the steam piping system, and air traps for discharging condensed water generated in the compressed air piping system. .

[0002]

2. Description of the Related Art A conventional float valve is disclosed, for example, in Japanese Utility Model Publication No. 63-12318. In this method, the float is placed in the valve chamber in a free state, and the valve port is opened and closed on the outer surface of the float, so that two float seats are formed on the valve chamber wall in parallel with the valve port axis. It was done. By forming the two float seats, when the float is displaced and seated on the float seat to close the valve port, the valve can be reliably closed.

[0003]

The conventional float valve described above has a problem that the valve port cannot be reliably closed on the outer surface of the float, particularly when the pressure difference between the front and rear of the valve port is large. there were. This is because if the pressure difference around the valve port is large,
When the float is displaced and approaches the float seat and the valve port, the float is sucked by the pressure difference to the valve port side. When the seat cannot be seated, the seat is seated on the valve port and one of the float seats, and cannot be seated on the other float seat, and the float is out of the original closed position. Therefore, it becomes impossible to securely close the valve port.

Accordingly, a technical problem of the present invention is that even if the pressure difference before and after the valve port is large, the valve port can be reliably closed without the float deviating from the original closing position. It is to get a valve.

[0005]

Means for Solving the Problems In order to solve the above technical problem, the technical means of the present invention is to form an inlet, a valve chamber, and an outlet in a valve casing and communicate the valve chamber with the outlet. A valve port is provided, the valve port is opened and closed on the outer surface of the float, and two float seats are provided in the valve chamber in parallel with the valve port axis, and the float and the two float seats repel each other. It is magnetized as follows.

[0006]

The operation of the above technical means is as follows.
Since the float and the float seat are magnetized to repel each other, the float is displaced and the outer surface of the float is sucked into the valve port and seated on only one of the float seats. Even if the user tries to sit on the seat due to the repulsive force of the magnetic force, the float receives a reaction force from one of the float seats, thereby displacing the float in the direction of the other seat where the seat could not be seated, and the original float. Can be returned to the closed position, and the valve port can be reliably closed.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment shows an example of a float type steam trap using a hollow float. Body 1,
The valve chamber 4 is formed by combining the inner wall 3 and the inner wall 3 by welding, and the inlet member 5 and the outlet member 6 are attached to the main bodies 1 and 2, respectively, by welding to form a valve casing. The inlet member 5 and the outlet member 6 are formed with female threads 7, 8 for connecting the pipes. The valve chamber 4 communicates with a steam piping system (not shown) by a female screw portion 7. The valve seat 9 is attached to the inner wall 3 below the valve chamber 4. The valve seat 9 is provided with a penetrating valve port 10 to communicate the valve chamber 4 with the female screw portion 8 on the outlet side. The hollow float 11 is arranged in the valve chamber 4 in a free state. The outer surface of the float 11 contacts the end of the valve port 10 . The float 11 Ru fitted with permanent magnets inside and fabricated in paramagnetic. Float 1
1 is that the side on which the permanent magnet is attached depends on the weight of the permanent magnet.
Below. In the lower part of the float 11, a valve port 10 is provided.
The float seat 15 is attached in parallel with the axis of. The illustrated float seat 15 is positioned at the back of the float 11 in the drawing, and although not shown, a similar float seat is provided in front of the float 11 in the drawing to form two float seats. Therefore, when the float 11 is located at the lowest position as shown in FIG.
The outer surface of the float 11 is supported at a total of three points: the end of the valve port 10 and the two float seats. Permanent magnets 12 repelling opposite to the magnetic force direction of the float 11 are embedded and attached to the two float seats. Reference numeral 20 denotes a porous screen that captures foreign substances in the fluid flowing into the valve chamber 4.

Next, the operation will be described. A mixed fluid of condensate and steam generated in a steam piping system (not shown) flows into the valve chamber 4 from the female screw portion 7 on the inlet side. When the condensed water accumulates in the valve chamber 4, the float 11 is lifted by its buoyancy to open the valve port 10, and the condensed water is discharged out of the system via the female screw portion 8 on the outlet side. When the condensate in the valve chamber 4 is discharged, the float 11 descends to close the valve port 10 and the two float seats 15.
Thus, the steam is prevented from being discharged to the outlet side.

When the pressure difference between the inlet side and the outlet side is large and the pressure difference before and after the valve port 10 is large, when the float 11 descends, the float 11 is moved to the valve port 10 side by the pressure difference. Aspirated accordingly. Even if the float 11 is to be seated on the valve port 10 and one of the two float seats 15, the permanent magnets 12 of the float 11 and the float seat 15 are required.
Float 11 repels, and float 11 becomes permanent magnet 1
2 on the front side of the drawing (not shown)
Displaced in the seat direction, and temporarily seated on both of the two float seats at the same distance according to the repulsive magnetic force to return to the original valve port closing position, and the valve port 10 is securely closed. can do.

[0010]

The present invention has the following specific effects. As described above, according to the present invention, it is possible to return to the original seating position of the float by the repulsive force of the float and the magnetic force of the float seat, and to reliably close the valve port.
In addition, if the float and the valve port are attracted by magnetic force, the closeability of the valve port can be improved, but when the float moves away from the valve port, the float's buoyancy or weight is offset. As a result, the opening force of the float valve is reduced. However, repelling the float seat and the float as in the present invention increases the valve opening force, and in the case of a higher pressure fluid, Can be used, or the float can be smaller.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a float valve of the present invention.

[Explanation of symbols]

 1, 2 body 3 inner wall 4 valve chamber 5 inlet member 6 outlet member 9 valve seat 10 valve port 11 float 12 permanent magnet 15 float seat

Claims (1)

(57) [Claims] 1. An inlet, a valve chamber, and an outlet are formed in a valve casing, a valve port communicating the valve chamber with the outlet is provided, and the valve port is opened and closed on an outer surface of the float, and is parallel to the valve port axis. Nijo
In those provided of the float seats in the valve chamber, the float valve, characterized in that the float seat of the float and Nijo each other are magnetized to repulse.