JPH0654155B2 - Float valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention utilizes a difference in specific gravity between a gas and a liquid to drive a valve means with an open or closed float to automatically supply one fluid from a gas-liquid mixing system. The structure of the float valve for exhausting the air.

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. For example, 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 that automatically discharges air mixed in the water piping system. Such as a vent.

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.

In a conventional float valve that opens and closes the valve opening by driving the valve means with a float, a float is attached to one end of the lever, the other end of the lever is attached to the valve chamber as a fulcrum, and a valve element that opens and closes the valve opening is provided near the fulcrum. It is attached. Alternatively, the float is attached to one end of the lever, the valve body for opening and closing the valve opening is attached to the other end of the lever, and the valve body is attached to the valve chamber with the vicinity of the valve body as a fulcrum.

In the above, in order to increase the discharge capacity,
That is, in order to obtain a large valve opening force, it is necessary to increase the float to increase the buoyancy and the self-weight, or to lengthen the lever to increase the buoyancy acting on the valve body to increase the self-weight expansion ratio. There was a problem of getting bigger.

<Prior Art> Therefore, as a valve for solving the above problem, the present applicant invented a float valve as shown in the application of Japanese Patent Application No. 63-250058. In this, one end of a valve member provided with a valve body that opens and closes a valve opening is hingedly connected to a valve chamber, a plurality of levers are provided to displace the valve member, and a float is centered so as to be surrounded by the plurality of levers. The levers are arranged so as to incline inward with respect to the displacement direction of the float, the lever is displaced by the displacement caused by the float of the float, and the valve member is displaced to open and close the valve port. According to this means, the buoyancy of the float can be increased by a plurality of levers, so that a large valve opening can be opened and a large discharge lift can be obtained.

<Problems to be Solved by the Present Invention> In the above, when the float moves up and displaces the lever, the float and the lever ascend while sliding, so that a slip resistance occurs in this portion, and this resistance is caused by the float. There is a problem in that the float does not slide smoothly because it hinders the upward movement of the float. In other words, the total buoyancy of the float could not be used effectively.

SUMMARY OF THE INVENTION The object of the invention is therefore to minimize the contact resistance between the float and the lever in a valve of the type in which the lever is actuated by a float which is displaced in the free state.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems forms a valve chamber in a valve casing having an inlet and an outlet, and connects the valve chamber and the outlet. A valve member is formed to form a valve opening, and one end of a valve member attached with a valve body for opening and closing the valve opening is hingedly connected to a valve chamber, and two levers for displacing the valve member are provided.
One end of the lever engages with the other end of the valve member and is arranged so as to surround the valve opening so as to face each other. The other end of each lever is inclined toward the valve opening side, and the float is provided between the levers. Two pieces are arranged in a free state.

<Operation> The operation of the above technical means is as follows.

The two spherical floats freely arranged between the two levers ascend and descend with the liquid level in the valve chamber. The liquid level rises, and the two floats also rise and come into contact with the inclined portion at the other end of the lever to be sandwiched between the levers. If the liquid level further rises from here, the two floats rise so as to roll the contact portion with the lever, and the lever is tilted by the action of spreading the lever to both sides, displacing the valve member and causing the valve element to open Open the valve. At this time, since each float rotates in the opposite direction, the two contact surfaces of the floats rotate in the forward direction, so that the two floats are vertically displaced and always rotate smoothly, with no slip resistance anywhere. Does not occur and becomes rolling resistance.

<Example> An example showing a specific example of the above technical means will be described.
(See FIGS. 1 and 2) This embodiment is applied to a closed float type steam trap. A lid 4 is fastened to the main body 2 with bolts 6a and 6b to form a valve casing having a valve chamber 8 therein. Body 2
A gasket 10 is interposed between the lid 4 and the lid 4 to keep the both airtight.

An inlet 12 is formed at the top of the body 2 and an outlet 14 is formed at the center of the lid 4. The inlet 12 communicates with the upper portion of the valve chamber 8 and is connected to a steam-using device (not shown) or the like to introduce condensed water into the valve chamber 8. The valve seat member 16 is screwed to the valve chamber 8 side of the lid 4, and the valve chamber 8 and the outlet 1 are passed through the valve port 18 formed in the valve seat member 16.
4, the condensate of the valve chamber 8 is led to the outlet 14. The inlet 12 and the outlet 14 are opened vertically and form female threads for piping, respectively. Reference number 9 is a strainer. Further, the impact member 11 is provided vertically on the axis of the inlet 12 so that the fluid from the inlet 12 does not directly flow into the center of the valve chamber 8.

One end 34a of an arm 34 as a valve member to which a valve element 32 for opening and closing the valve port 18 is attached is hingedly connected to an arm attaching member 36. This is formed by penetrating the arm mounting member 36 with a pin 38. The arm mounting member 36 is the lid 4
Install with screws 40a and 40b in the valve chamber. The arm 34 is made of a strip-shaped thin plate, and the other end has a cruciform shape, and forms protrusions 35a, b, c. One end of a lever described later engages with the protrusions 35a and 35b, and a bimetal 42 (not shown in FIG. 1 for convenience) is arranged below the protrusion 35c. The bimetal 42 is attached with screws 42a and 42b, has a substantially U-shape, and spreads at a low temperature to protrude the arm 35.
It exerts a force capable of pushing up c to open the valve opening, and narrows at a high temperature to change into a shape not involved in the protrusion 35c.

Further, the lever mounting members 22a and 22b are screwed into the valve chamber of the lid 4.
Attach with 4a, b. The levers 26a and 26b are attached to the lever attaching members 22a and 22b by the pins 28a and 28b to be hingedly coupled. Therefore, the levers 26a and 26b can rotate around the pins 28a and 28b as fulcrums. The lower ends 27a, b of the levers are brought into contact with the lower surfaces of the protrusions 35a, b of the arm 34. The upper portions of the levers 26a, 26b extend obliquely above the floats 20a, 20b at an angle α from the vertical line.

Inside the valve chamber 8 and between the levers 26a and 26b, hollow cylindrical floats 20a and 20b made of a stainless steel thin plate are accommodated in a free state. Fig. 1 is a float 2 for the front sectional view
Although 0a and 0b are only circular, they are columnar shapes extending toward the side opposite to the paper surface. Therefore, the levers 26a and 26b contact the peripheral side surfaces of the cylindrical float, respectively. Float 20
a and b float in the condensed water accumulated in the valve chamber 8 and ascend and descend with the liquid surface.

The operation of the steam trap is as follows. Entrance 1
2 is connected to the condensate generation place such as steam using equipment. Condensed water and steam flow from the inlet 12, hit the impact member 11 and are separated into both sides, and flow down toward the side wall in the valve chamber 8. Then, condensate accumulates in the lower part and steam separates in the upper part. The floats 20a and 20b float as the liquid level in the valve chamber 8 rises, and come into contact with the upper inclined portions of the levers 26a and 26b (state shown in FIG. 1).

When the liquid level further rises, the float also rises, and the float 20
a and b act to spread the levers 26a and b to both sides, and the levers 26a and b rotate in the valve opening direction (the lever 26a is counterclockwise and the lever 26b is clockwise in FIG. 1). Then, the lower ends 27a and b of the levers lift the protrusions 35a and 35b of the arm 34 by the lever principle, and the valve element 32 attached to the arm 34 opens the valve opening 18.
Condensate in the valve chamber 8 is discharged from the valve port 18 to the outlet 14.

At this time, the float 20a rotates counterclockwise with respect to the lever 26a and rolls, and the float 20b moves to the lever 26b.
It rotates clockwise and rises while rolling. Therefore, since the two floats rotate in the forward direction, no slip resistance (friction) is generated in any part, and the two floats move up and down with only rolling resistance (friction).

In addition, the floats 20a and 20b are raised to move the levers 26a and 26b.
When rotating, the buoyancy acts as a wedge force on each lever 26a, 26b. By this wedge force, the buoyancy of the float can be amplified and given to the lever, and the large valve opening can be opened.

When the liquid level drops due to discharge, the float 20
The a and b descend while rotating, and the levers 26a and b rotate in the valve closing direction as the float descends to lower the arm 34 and the valve element 32 closes the valve port 18 to prevent the outflow of steam.
Such an operation is automatically repeated.

<Effects of the Invention> The present invention has the following unique effects.

Since the valve according to the mechanism of the present invention displaces the lever in the float in the free state, a large discharge amount can be obtained, and the float and the lever are always in contact with each other only with the rolling resistance without slipping resistance, so that both are caught. As a trap, a smooth discharge operation can be performed. Further, the resistance is reduced and the buoyancy of the float can be effectively utilized, and the float can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a front sectional view of a steam trap of an embodiment of the float valve of the present invention, and FIG. 2 is an enlarged plan view of the valve portion of FIG. 2: Main body, 4: Lid 8: Valve chamber, 12: Inlet 14: Outlet, 18: Valve port 20a, b: Float, 26a, b: Lever 32: Valve body, 34: Arm

Claims (1)

[Claims] 1. A valve member having a valve casing having an inlet and an outlet, a valve opening for communicating the valve opening and the outlet, and a valve member for opening and closing the valve opening. Two levers for hinged connection and for displacing the valve member are arranged such that one end of the lever engages with the other end of the valve member and surrounds the valve opening and opposes each other. The other end of the float valve is inclined toward the valve port side, and two floats are arranged in a free state between both levers.