JPH0654159B2 - 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 at the upper or lower part of the valve chamber, and moves the valve means by vertical movement of the float accommodated in the valve chamber. It is driven to open and close the valve port to selectively and automatically discharge one fluid.

A conventional float valve that drives a valve means by a float to open and close a valve port is equipped with a float at one end of a lever and a valve body that opens and closes the valve port at the other end of the lever, and closes the valve body. It is attached to the valve chamber as a fulcrum.

Problems to be Solved by the Invention In the above, in order to increase the valve opening lift of the valve body, it is necessary to increase the amount of displacement of the float, and there is a problem that the valve chamber, that is, the casing, becomes large. there were.

Therefore, the technical problem of the present invention is to increase the valve opening lift of the valve body without enlarging the valve chamber.

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 lever that forms a valve opening that connects the valve chamber and the outlet and is attached to one end with a valve body that opens and closes the valve opening is rotatably attached to the valve chamber with the vicinity of the valve body as the first fulcrum, and floats inside the valve chamber. Is accommodated and the other end of the lever is driven by its vertical movement, the first fulcrum is positioned in the elongated hole, and the second fulcrum with which the lever rotated in the valve opening direction contacts is more than the first fulcrum. The lever is formed on the other end side of the lever, and after the valve is opened, the first fulcrum is moved to the side away from the valve port in the elongated hole with the second fulcrum as the fulcrum.

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

The float accommodated in the valve chamber is vertically displaced along with the liquid level in the valve chamber. The float that floats or descends and is displaced in the valve opening direction operates the other end of the lever to rotate the lever in the valve opening direction with the first fulcrum as a fulcrum. The lever rotated in the valve opening direction contacts the second fulcrum, and further rotates in the valve opening direction with the second fulcrum as the fulcrum. At this time, the first fulcrum displaces the inside of the long hole to the side away from the valve port. Since the second fulcrum is provided on the other end side of the lever with respect to the first fulcrum, the displacement amount at the first fulcrum portion of the lever with respect to the displacement of the float becomes large, and the valve opening lift of the valve body becomes large.

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

As described above, according to the present invention, since the valve opening lift of the valve body can be increased without increasing the size of the casing, the discharge capacity can be increased even with a small trap.

Example An example showing a specific example of the above technical means will be described (see FIGS. 1 to 3).

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 screwed to the lower portion of the lid 2, the valve chamber 4 and the outlet 7 are communicated with each other through the valve opening 9 formed in the valve seat member 8, and the condensed water of the valve chamber 4 is guided to the outlet 7. Inlet 6 and outlet 7 open horizontally
Each has a female thread for piping. The gasket 10 keeps the airtightness between the valve seat member 8 and the lid 2.

A hollow spherical float 11 made of a stainless steel thin plate is accommodated in the valve chamber 4 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.

A lever mounting member 12 is formed on the lid 2. The lever attachment member 12 has a long hole 3 formed therein. The lever 13 is mounted in the elongated hole 3 of the lever mounting member 12 with a pin. The pin forms the first fulcrum 14. Therefore, the lever 13 can rotate about the first fulcrum 14. Further, the first fulcrum 14 can move within the elongated hole 3. A protrusion is formed on the lid 2. The protrusion is the second fulcrum 2
It is 0 and is located above the first fulcrum 14. A valve body 15 for opening and closing the valve opening 9 is attached to the lever 13. The upper portion 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 for guiding the float 11 in the vertical direction, and a total of 2 with the front side of the paper surface.
A small gap is formed between the float 11 and the float 11.

The bimetal 18 is attached to the lid 2 with screws 19. The bimetal 18 is substantially U-shaped and spreads at a low temperature to exert a force capable of pushing up the lever 13 to open the valve, and when the bimetal 18 is at a high temperature, the bimetal 18 narrows to change into a shape that does not open the lever 13.

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. FIG. 1 shows the valve closed state. The float 11 floats as the liquid level in the valve chamber 4 rises and the lever 1
3 and the side wall 16 are abutted. When the liquid level further rises, the buoyancy of the float becomes large, and the buoyancy becomes a wedge force, and the lever 13
Act on. This wedge force causes the lever 13 to move to the first fulcrum 1
4 as a fulcrum and the valve body 15 opens the valve opening 9 by rotating in the valve opening direction (clockwise direction in FIG. 1) to a position where it abuts on the second fulcrum 20. FIG. 2 shows the state of contact with the second fulcrum 20. The first fulcrum 14 is located at the right end of the elongated hole 3. When the liquid level further rises, the lever 13 further rotates about the second fulcrum 20 in the valve opening direction until the first fulcrum 14 is located at the left end of the slot 3 as shown in FIG. In this way, the condensed water in the valve chamber 4 is discharged from the valve port 9 to the outlet 7. When the liquid level drops due to drainage, float 1
1, the lever 13 rotates in the valve closing direction as the float descends, and the valve body 15 closes the valve opening 9 to prevent the outflow of steam. Such an operation is automatically repeated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a closed float type steam trap of an embodiment of a float valve of the present invention, and FIGS. 2 and 3 are for explaining an operating state of the float valve of FIG. FIG. 1: Main body, 2: Lid 3: Long hole, 4: Valve chamber 6: Inlet, 7: Outlet 9: Valve opening, 11: Float 13: Lever, 14: First fulcrum 15: Valve body, 20: Second fulcrum

Claims (1)

[Claims] 1. A lever having a valve casing that forms an inlet, a valve chamber, and an outlet, forms a valve opening that communicates the valve chamber and the outlet, and has a valve body attached to one end to open and close the valve opening, near a valve body. The first
It is rotatably attached to the valve chamber, the float is housed in the valve chamber, and the other end of the lever is driven by the vertical movement of the float. The first fulcrum is positioned in the elongated hole and rotated in the valve opening direction. A second fulcrum on which the lever abuts is formed on the other end side of the lever with respect to the first fulcrum, and after the valve is opened, the second fulcrum is the fulcrum and the first fulcrum is away from the valve opening in the slot. Float valve designed to move to.