JP4657487B2 - Float valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a float valve that opens and closes a valve hole directly on the outer surface of a float using a specific gravity difference between gas and liquid and automatically discharges one fluid from a gas-liquid mixing system.
[0002]
As a float valve, a steam trap that automatically discharges condensate generated in the steam piping system, an air trap that automatically discharges condensed water generated in the compressed air piping system, and automatic condensation water generated in the gas piping system There are a gas trap that automatically discharges, an oil trap that automatically discharges water mixed in the oil piping system, and an air vent that automatically discharges air mixed in the water piping system.
[0003]
[Prior art]
An example of a conventional float valve is disclosed in Japanese Patent Application Laid-Open No. 7-83393. What is shown here is that a valve chamber is formed in a casing having an inlet and an outlet, a valve seat having a valve hole communicating with the valve chamber and the outlet is provided, and a portion that contacts the valve chamber side end of the valve hole is provided. A main float formed in a spherical shape is rotatably arranged in the main float cage, and a separate float is attached to the main float cage, and the valve hole is directly opened and closed on the spherical outer surface of the main float. .
[0004]
[Problems to be solved by the invention]
In the above conventional float valve, since a lever is used, it is possible to discharge a relatively large amount of condensate by opening and closing a large-diameter valve hole. was there.
[0005]
Accordingly, an object of the present invention is to discharge a relatively large amount of fluid without using a lever, and to reduce the shape of the entire float valve.
[0006]
[Means for Solving the Problems]
The means of the present invention devised to solve the above-mentioned problem is that a valve chamber is formed in a casing having an inlet and an outlet, and a valve seat having a valve hole communicating with the valve chamber and the outlet is provided. the main float formed in a spherical shape of the portion in contact with the chamber-side end portion disposed in a free state in the valve chamber, in which direct-off valve the valve hole in the spherical outer surface of the main float, low wall of the valve housing A float seat that defines the lowering position of the main float is formed, and a sub float having a diameter smaller than the diameter of the main float is arranged on the inlet side of the float seat and below the valve chamber. A follower float guide is provided in the chamber so that the follower floats up and down depending on the liquid level in the valve chamber so that the follower floats up and down and pivots. by contact, follow flow It is intended to assist the opening of the main float bets buoyancy.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can open and close a larger valve hole as compared with the case of only the main float by arranging the sub float for assisting the valve opening of the main float, and by not using a lever, The entire shape of the float valve is not increased.
[0008]
【Example】
An embodiment of the present invention will be described with reference to FIG. In this embodiment, the float valve is applied to a free float type steam trap that is one of steam traps that automatically discharge condensate generated in the steam piping system.
[0009]
A valve casing is formed by the main body 1 and the lid member 2. The inside of the valve casing is partitioned by a partition wall 3 and is divided into a valve chamber 5 communicating with the inlet 4 and an outlet passage 7 communicating with the outlet 6. The inlet 4 opens at the top of the valve chamber 5. A valve seat 8 provided with a valve hole 9 in the lower part of the valve chamber 5 is attached to the main body 1 and fixed with a holding plug 10.
[0010]
A through hole 11 is provided in a side portion of the valve seat 8, and the valve chamber 5 and the outlet passage 7 are communicated with each other through the through hole 11 and the valve hole 9. Although not shown, a gasket or the like for maintaining airtightness is assembled to the valve seat 8, the holding plug 10 and the lid member 2, respectively.
[0011]
A hollow spherical stainless steel main float 12 is disposed in the valve chamber 5 in a free state. The main float 12 rises and falls according to the level of the condensate accumulated in the valve chamber 5, and opens and closes the valve chamber 5 side end of the valve hole 9 on its outer surface. A float seat 13 that defines the lowering position of the main float 12 is formed on the bottom wall of the main body 1.
[0012]
A hollow spherical secondary float 14 is arranged on the inlet 4 side of the float seat 13 and below the valve chamber 5 so as to be vertically movable and rotatable. By making the diameter of the sub float 14 smaller than the diameter of the main float 12, the shape of the entire float valve can be reduced.
[0013]
A sub float guide portion 15 is provided in the valve chamber 5 of the main body 1 so that the sub float 14 can be moved up and down and turned up and down by the liquid level in the valve chamber 5. The sub-float guide portion 15 is provided with a single guide portion 15 at the back of the sub-float 14 in the drawing, and a guide portion (not shown) is also provided before the sub-float 14 in the drawing so that the gap between the two guide portions can be reduced. The sub float 14 is lifted and lowered so as to be rotatable and vertically movable.
[0014]
Further, the sub float 14 is prevented from floating above the valve chamber 5 by the guide portion 15. In FIG. 1, the secondary float 14 rises to the position indicated by the broken line 16 and contacts the outer surface of the main float 12. The sub-float 16 contacts the step portion 19 formed on the main body 1 and is prevented from further floating.
[0015]
The operation of the free float steam trap is as follows. When steam and condensate flow into the valve chamber 5 from the inlet 4 and the condensate liquid level in the valve chamber 5 rises, the secondary float 14 rises to the position shown by the broken line 16, while the main float 12 is shown in FIG. Maintain the valve closed as shown. When the liquid level in the valve chamber 5 further rises, both the main float 12 and the sub float 16 float, the outer surface of the main float 12 opens the valve hole 9, and condensate in the valve chamber 5 is discharged from the outlet passage 7. Discharge to outlet 6. The sub-float 16 contacts the step portion 19 and is prevented from rising and further displacement.
[0016]
When the main float 12 opens the valve hole 9, the main float 12 is rotated clockwise by the buoyancy with the upper end portion 17 of the valve seat 8 as a rotation fulcrum. This movement is the same as the conventional free float valve.
[0017]
In this embodiment, the secondary float 14 assists in opening the main float 12. That is, at the position where the main float 12 opens, the buoyancy of the sub float 16 is applied to the main float 12 as auxiliary buoyancy. This auxiliary buoyancy acts as a rotational moment with the length of the arm from the rotation fulcrum 17 of the main float 12 to the contact point 18 of the main and secondary floats 12 and 16.
[0018]
By assisting the valve opening of the main float 12 by the sub float 16 in this way, the valve opening force can be increased without using a lever, and a valve hole larger than that in the case of a conventional free float alone can be opened and closed. can do.
[0019]
When the liquid level in the valve chamber 5 is lowered due to the discharge of the condensate, the floats 12 and 16 of the main and subordinates descend, and the valve hole 9 is directly closed on the outer surface of the main float 12 so that steam leaks to the outlet 6 side. To prevent that.
[0020]
In the present embodiment, an example in which only one sub float 14 is used is shown, but a plurality of sub floats 14 can be arranged around the main float 12 and used.
[0021]
【The invention's effect】
As described above, the present invention can open a large valve hole and discharge a relatively large amount of fluid without using a lever by assisting the valve opening of the main float with the sub float, An increase in the size of the entire float valve can also be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a free float steam trap showing an embodiment of the present invention.
[Explanation of symbols]
1 Body 2 Lid member 4 Inlet 5 Valve chamber 6 Outlet 7 Outlet passage 8 Valve seat 9 Valve hole 12 Main float 14 Sub float 15 Sub float guide

Claims (1)

A main float in which a valve chamber is formed in a casing having an inlet and an outlet, a valve seat having a valve hole communicating with the valve chamber and the outlet is provided, and a portion of the valve hole contacting the valve chamber side end is formed in a spherical shape. In a valve chamber that is arranged in a free state and directly opens and closes the valve hole at the spherical outer surface of the main float, a float seat that defines the lowering position of the main float is formed on the lower wall of the valve casing, A sub float having a diameter smaller than that of the main float is arranged on the inlet side of the float seat and below the valve chamber, and the sub float is vertically movable and rotatable in the valve chamber of the valve casing. A sub float guide is provided so that the sub float floats and descends depending on the liquid level, and the sub float rises by the liquid level in the valve chamber and comes into contact with the outer surface of the main float. Features to do Float valve that.

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