JPH06100317B2 - Float valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a difference in specific gravity between gas and liquid to drive valve means with an open or closed float to automatically remove one fluid from a gas-liquid mixing system. The structure of the float valve for discharging.

The float valve is used when either gas or liquid is selectively and automatically discharged from a system in which gas and liquid are mixed. 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 an air vent that automatically discharges air mixed in the water piping system. Etc.

A gas having a small specific gravity is located above a liquid having a large specific gravity. The liquid surface moves up and down according to the change in the quantitative ratio of liquid and gas. The float floats on the liquid surface by the balance between the buoyancy acting on it and its own weight, and moves up and down together with the liquid surface. The float valve uses these natural laws, and it separates gas and liquid in the valve chamber, arranges the valve opening in the upper or lower part of the valve chamber, and moves the float accommodated in the valve chamber to move the valve means. It is driven to open and close the valve port to selectively and automatically discharge one fluid.

A conventional float valve forms an inlet, a valve chamber, and an outlet in a valve casing, and forms a single valve port that communicates the valve chamber and the outlet.
The float is attached to one end of the lever, the other end of the lever is attached to the valve chamber with the other end as a fulcrum, and a single valve body for opening and closing the valve opening is attached near the fulcrum. Alternatively, a float is attached to one end of the lever, a single valve body for opening and closing the valve opening is attached to the other end of the lever, and the single valve body is attached to the valve chamber with the vicinity of the valve body as a fulcrum.

Problems to be Solved by the Present Invention In the above, in order to increase the discharge capacity,
Although it is sufficient to increase the area of the valve opening, the valve closing force also increases accordingly and there is a limit. Therefore, if the float is increased to increase the buoyancy or the self-weight, or if the lever is lengthened to increase the buoyancy acting on the valve body or the enlargement ratio of the self-weight, there is a problem that the casing becomes large.

Therefore, the technical problem of the present invention is to increase the discharge capacity without increasing the float or lengthening the lever.

MEANS FOR SOLVING THE PROBLEM The technical means of the present invention taken to solve the above-mentioned technical problem forms an inlet, a valve chamber and an outlet in a valve casing,
A plurality of valve openings that communicate the valve chamber and the outlet are formed, a float is placed in the valve chamber in a free state, and a plurality of valve bodies that sequentially open the plurality of valve openings are attached to a lever. The float is attached to the valve chamber while being inclined at an acute angle with respect to the displacement in the valve opening direction.

Action The action of the above technical means is as follows.

The float arranged freely in the valve chamber is vertically displaced together with the liquid level in the valve chamber. The float that floats or descends and is displaced in the valve opening direction contacts the lever. Since the lever is inclined at an acute angle with respect to the displacement of the float in the valve opening direction, the buoyancy of the float or its own weight acts as a wedge force on the lever. Therefore, even if a float of the same size and a lever of the same length are used, the valve opening force can be increased and a large valve opening can be opened. Also,
Since a larger wedge force acts on a valve body that is operated to open later, a valve opening that is opened later can be opened more easily and a larger valve opening can be made.

EFFECTS OF THE INVENTION The present invention produces the following unique effects.

As described above, according to the present invention, since the wedge force is used, the valve opening force can be increased. Further, since the plurality of valve openings are opened one after another, the discharge capacity can be increased as the sum of the areas of the respective valve openings. In particular, since a greater wedge force acts on the valve body that is operated to open the valve later, the valve opening can be enlarged correspondingly.

Example An example showing a specific example of the above technical means will be described (see FIG. 1).

This embodiment is applied to a closed float type steam trap.

A lid 2 is fastened to the main body 1 with bolts (not shown) to form a valve casing having a valve chamber 4 inside. A gasket 5 is interposed between the main body 1 and the lid 2 to keep them airtight.

An inlet 6 is formed in the upper portion of the lid 2 and an outlet 7 is formed in the lower portion. The inlet 6 communicates with the upper part of the valve chamber 4 and uses steam (not shown).
And the like to introduce condensate into the valve chamber 4. The valve seat member 8 is joined to the lower portion of the lid 2. The valve seat member 8 has a first valve opening 3 and a second valve opening 9. The valve chamber 4 and the outlet 7 are communicated with each other through the first valve port 3 and the second valve port 9, and the condensate of the valve chamber 4 is discharged to the outlet port 7.
Lead to. The inlet 6 and the outlet 7 are opened in the horizontal direction, and each form an internal thread for piping.

Hollow spherical float made of stainless steel thin plate in valve chamber 4
House 11 in a free state. The float 11 floats on the condensed water accumulated in the valve chamber 4 and ascends and descends together with the liquid surface.

Attach the lever mounting member 12 to the lid 2. Lever mounting member
Attach lever 13 to 12 with pin 14. Lever 13 is pin 14
Can be rotated with the fulcrum as a fulcrum The first valve body 15 that opens and closes the first valve opening 3 is fixed to the lever 13 with a snap ring 20 and attached. Further, the second valve body 21 for opening and closing the second valve port 9 is flanged.
Install play with 22. The upper part of the lever 13 extends obliquely above the float 11 at an angle α from the vertical line. The side wall 16 (left side in FIG. 1) of the valve chamber 4 extends in the vertical direction.
Reference numeral 17 is a rib that guides the float 11 in the vertical direction, and is formed at two positions in total on the front side of the paper surface, and a slight gap is formed between the float 11 and the front side.

The operation of the steam trap is as follows.

The inlet 6 is connected to a condensate generation place such as steam-using equipment. Condensate and steam flow into the valve chamber 4, and condensate is separated into a lower part and steam is separated into an upper part and accumulated. The float 11 floats as the liquid level in the valve chamber 4 rises, and contacts the lever 13 and the side wall 16. When the liquid level further rises, the buoyancy of the float increases, and the buoyancy acts as a wedge force on the lever 13. By this wedge force, the lever 13 rotates in the valve opening direction (clockwise direction in FIG. 1), and first, the first valve body 15 opens the first valve port 3. When the lever 13 further rotates in the valve opening direction, the second valve body 21 opens the second valve port 9. Valve chamber 4
Of the condensate is discharged from the first valve opening 3 and the second valve opening 9 to the outlet 7. When the liquid level drops due to drainage, the float 11
Lower, the lever 13 rotates in the valve closing direction as the float lowers, and the first valve body 15 moves the first valve opening 3 and the second valve body 21 moves the second valve.
The valve opening 9 is closed to prevent steam from flowing out. Such an operation is automatically repeated.

[Brief description of drawings]

FIG. 1 is a sectional view of a closed float type steam trap of an embodiment of the float valve of the present invention. 1: Main body, 2: Lid 3: First valve port, 4: Valve chamber 6: Inlet, 7: Outlet 9: Second valve port, 11: Float 13: Lever, 15: First valve body 21: Second valve body

Claims (1)

[Claims] 1. A valve casing is provided with an inlet, a valve chamber and an outlet, and a plurality of valve ports are formed to connect the valve chamber and the outlet. A float is arranged in the valve chamber in a free state. A float valve in which a plurality of valve bodies that open in sequence are attached to a lever, and the lever is attached to a valve chamber by inclining the lever at an acute angle with respect to displacement of the float in the valve opening direction.