JPH0654157B2 - 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 by a float to automatically discharge liquid from a gas-liquid mixing system. Regarding

The float valve is used when only the liquid is selectively and automatically discharged from the system in which the gas and the liquid are mixed. Steam traps that automatically discharge condensate generated in the steam piping system, air traps that automatically discharge condensed water generated in the compressed air piping system, and the like.

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 due to 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, it separates gas and liquid in the valve chamber, arranges the valve opening in the lower part of the valve chamber, and drives the valve means by the vertical movement of the float accommodated in the valve chamber. It opens and closes the valve port to selectively and automatically discharge the liquid.

2. Description of the Related Art The applicant of the present application previously proposed Japanese Patent Application No. 63-231242, which is a float valve capable of obtaining a large opening force. In this, a valve casing forms an inlet, a valve chamber, and an outlet, forms a valve port that communicates the valve chamber and the outlet, arranges a float in the valve chamber in a free state, and attaches a valve body that opens and closes the valve port. The lever is attached to the valve chamber by inclining it at an acute angle with respect to the displacement of the float in the valve opening direction.By increasing the float buoyancy of the float or its own weight as a wedge force and acting on the lever, the valve opening force can be increased. It was done.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above, since the float has to be displaced while sliding on the lever and the inner wall of the valve chamber facing the lever, the sliding friction resistance is relatively large, and the expansion of the valve opening force is limited. was there.

Therefore, a technical object of the present invention is to reduce the sliding friction resistance so that a larger valve opening force can be obtained.

MEANS FOR SOLVING THE PROBLEM The technical means of the present invention taken to solve the above-mentioned technical problem is a valve casing that forms an inlet, a valve chamber and an outlet with a valve casing and connects the valve chamber and the outlet. And a float is connected to the other end of the first lever mounted in the valve chamber with one end serving as a fulcrum, a recess is formed in the arm of the first lever, and the center part is pierced through the recess to serve as a fulcrum. The second lever mounted in the valve chamber is tilted at an acute angle with respect to the displacement of the float in the valve opening direction, and an elastic member is rotatably connected to one end of the second lever about a fulcrum. One end of a third lever, to which a valve body for opening and closing the mouth is attached, is arranged so as to face one end of the second lever, and the other end is attached to a fulcrum in a valve chamber.

Action The float moves up and down with the liquid level in the valve chamber around the fulcrum of the first lever. Displacement of floating float is first
It is transmitted to the second lever via the recess of the lever. Since the second lever is inclined at an acute angle with respect to the displacement of the float in the valve opening direction, the float's buoyancy or its own weight acts on the lever in the same manner as the wedge force of the previous application. Further, since one end of the second lever is connected by the elastic member so as to be rotatable around the fulcrum of the second lever, when the one end of the second lever is displaced to the valve opening position side from the fulcrum position by the wedge force. A larger valve opening force can be obtained by the elastic force acting as the valve opening force. The frictional resistance acting on the float and the second lever is almost the same as that of the previous application,
Since the resistance acting on the fulcrum of the first lever is smaller than the frictional resistance acting on the float and the inner wall of the valve chamber of the prior application, the resistance as a whole can be reduced and a large valve opening force can be obtained.

EFFECTS OF THE INVENTION As described above, according to the present invention, the valve opening force can be increased by reducing the frictional resistance.

Further, not only the wedge force but also the elastic force of the elastic member can be used as the valve opening force, so that a larger valve opening force can be obtained.

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. Incidentally, FIG. 1 shows the valve closed state and FIG. 2 shows the valve opened state.

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 first lever 11 is attached to the lid 2 with the pin 12 and is hinged. At the other end of the arm portion of the first lever 11, the rollers 13a, 1
A recess 18 is formed in 3b, and a hollow spherical float 14 made of a stainless steel thin plate is connected. The float 14 floats on the condensate accumulated in the valve chamber 4, and floats and descends together with the liquid surface while rotating around the pin 12 as a fulcrum.

The second lever 15 is attached to the lid 2 with the pin 16 and is hinged. One end of the second lever 15 penetrates the recess 18 of the first lever 11, and the other end thereof is connected to one end 19a of a coil spring 19 as an elastic member. Second lever 15 is pin 1
6 is used as a fulcrum to receive a rotational force due to the tensile force of the coil spring 19 (in FIG. 1, a rotational force in the counterclockwise direction is received). One end of the second lever 15 is inclined at an acute angle with respect to the displacement of the float 14 in the valve opening direction and extends upward. The other end 19b of the coil spring 19 is fixed to the main body 1.
Further, the third lever 20 is attached to the lid 2 with the pin 21 and is hinged. A valve body 17 for opening and closing the valve opening 9 on the third lever 20.
Attach with a snap ring. The other end 20a of the third lever 20 is arranged so as to face the end of the second lever 15.

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 14 is the pin 1 of the first lever 11.
With 2 as a fulcrum, the liquid level in the valve chamber 4 rises and the surface floats, and the second lever 15 is rotated clockwise through the rollers 13a and 13b. In this case, the buoyancy of the float 14 acts on the second lever 15 as an expanded wedge force. The portion of the second lever 15 below the pin 16 contacts the other end 20a of the third lever 20 against the rotational force of the coil spring 19. By abutting, the lower end portion of the second lever 15, that is, the connection portion with the one end portion 19a of the coil spring 19 is located on the left side from the vertically lower side of the pin 16, and the rotational force of the coil spring 19 is centered on the pin 16. It changes in the direction of rotation.
The valve body 17 opens the valve opening 9 (the state shown in FIG. 2) by the clockwise rotating force and the expanded wedge force, and the condensed water in the valve chamber 4 is discharged from the valve opening 9 to the outlet 7. It When the liquid level drops due to discharge, the float 14 descends with it,
As the float 14 descends, the second lever 15 rotates counterclockwise. Also in this case, the weight of the float 14 is the second
It acts as an enlarged wedge force on the lever 15. The second lever 15 rotates, and the lower end of the second lever 15 rotates to the third lever 20.
When the valve body 17 is no longer involved in the other end portion 20a, the valve body 17 closes the valve opening 9 to prevent the outflow of steam. Such an operation is automatically repeated.

In the above embodiment, the float 14 comprises rollers 13a, 1
Since it comes into contact with the second lever 15 via 3b and is displaced, rolling frictional resistance works between the roller and the second lever 15, and the displacement resistance can be made smaller.

[Brief description of drawings]

FIG. 1 is a sectional view of a closed float type steam trap in an embodiment of a float valve of the present invention in a closed state, and FIG. 2 is a sectional view of the same in an opened state. 1: Main body, 2: Lid 4: Valve chamber ,: Inlet 7: Outlet, 9: Valve port 11: First lever, 14: Float 15: Second lever, 17: Valve body 18: Recess, 19: Coil spring 20: 3rd lever, 21: 3rd lever pin

Claims (1)

[Claims] 1. A valve casing forming an inlet, a valve chamber, and an outlet, forming a valve port communicating the valve chamber and the outlet, and using one end as a fulcrum, a float is attached to the other end of a first lever mounted in the valve chamber. The second lever, which is connected to the first lever and has a recess formed in the arm thereof, is inserted through the recess into the valve chamber with the central portion as a fulcrum to form an acute angle with respect to the displacement of the float in the valve opening direction. The second lever is attached so as to be tilted, an elastic member is rotatably connected to one end of the second lever about a fulcrum, and one end of a third lever having a valve body for opening and closing the valve opening is opposed to one end of the second lever. Float valve installed in the valve chamber with the other end as a fulcrum.