JPH02212698A - Float valve - Google Patents

Abstract

PURPOSE:To provide a further higher opening force by a method wherein since, when the one end of a second lever is coupled rotatably around the fulcrum of a second lever through the force of a resilient member, the one end of the second lever is displaced to a position near the opening position side than a fulcrum position by means of wedge force, a resilient force is exerted as an opening force. CONSTITUTION:The part, positioned lower than a pin 16, of a second lever 15 is brought into contact with the other end part 20a of a third lever 20 against the rotation force of a coil spring 19. The contact causes the coupling part of a second lever 15 to be positioned leftwardly of a position vertically below the pin 16, and the rotation force of the coil spring 19 is changed clockwisely centering around the pin 16. The rotation force in a clockwise direction and buoyancy of a float 14 causes clockwise rotation of the second lever 15 through rollers 13a and 13b, and by means of a wedge force increased due to the rotation of the second lever, a valve body 17 opens a valve port 9, and condensate in a valve chamber 4 is discharged through the valve port 9 to an outlet 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention utilizes the difference in specific gravity between gas and liquid to drive a valve means with a float to automatically discharge liquid from a gas-liquid mixing system. Regarding @zo.

The float valve is used to selectively and automatically discharge only liquid from a system in which gas and liquid coexist. These include steam traps that automatically discharge condensate generated in steam piping systems, air traps that automatically discharge condensed water generated in compressed air piping systems, etc.

The gas with lower specific gravity is located above the liquid with higher specific gravity. The liquid level moves up and down in response to changes in the quantitative ratio of liquid and gas. The float floats on the liquid surface due to the balance between the buoyant force acting on it and its own weight, and moves up and down with the liquid level. Float valves utilize these natural laws. Gas and liquid are separated in a valve chamber, a valve port is placed at the bottom of the valve chamber, and the valve means is driven by the vertical movement of a float housed in the valve chamber. to open and close the valve port.
It is designed to selectively and automatically drain liquid.

Prior Art The applicant of the present invention previously proposed a float valve capable of obtaining a large opening force in Japanese Patent Application No. 23124.2/1983. this is,
An inlet, a valve chamber, and an outlet are formed in the valve casing, a valve port is formed to communicate the valve chamber and the outlet, a float is placed in the valve chamber in a free state, and a valve body for opening and closing the valve port is attached. of,
It is installed in the valve chamber at an acute angle with respect to the displacement of the float in the valve opening direction, and the valve is opened by simulating the float's buoyancy or its own weight and expanding it to act on the lever. ] This is a greatly increased version of J.

Problems to be Solved by the Present Invention In the above system, the float must be displaced while sliding on the lever and the inner wall of the valve chamber facing the lever, so the sliding friction resistance is relatively large, and there is a limit to increasing the valve opening force. I chewed it.

Therefore, the technical problem 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 Problems The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber, and an outlet with a valve casing,
A valve port communicating between the valve chamber and the outlet is formed, a float is connected to the other end of a first lever installed in the valve chamber with one end serving as a fulcrum, and a recess is formed in the arm of the first lever, and the recess is formed in the arm of the first lever. A second lever is installed in the valve chamber through the center part with the center part as a fulcrum, and the second lever is installed so as to be inclined at an acute angle with respect to the displacement of the float in the valve opening direction. One end of the third lever, to which the elastic part A is connected, and a valve body for opening and closing the valve port is attached, is arranged opposite to one end of the second lever, and the other end is used as a fulcrum, and the third lever is installed in the valve chamber. This is something.

The working float is displaced up and down with the liquid level in the valve chamber about the fulcrum of the first lever. The displacement of the floating float is transmitted to the second lever via the recess of the first 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 buoyancy force or dead weight of the float acts on the lever in a magnified manner similar to the wedge of the prior application. In addition, since one end of the second lever is connected to the elastic member so as to be rotatable about the fulcrum of the second lever, if one end of the second lever is displaced toward the valve opening position from the fulcrum position due to a detected force. An even greater valve opening force can be obtained by the elastic force acting as a valve opening force. Therefore, the frictional resistance acting on the float and the second lever is almost the same as that in the earlier application, but the resistance acting on the fulcrum of the first lever is greater than the frictional resistance acting on the float and the inner wall of the valve chamber in the earlier application. Since it is small, the overall resistance 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.

Furthermore, not only the force but also the elastic force of the elastic member can be used as the valve opening force, and an even larger valve opening force can be obtained.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIGS. 1 and 2).

This embodiment is applied to closed float type steamers 1 to LAP. Note that FIG. 1 shows the valve in the closed state, and FIG. 2 shows the valve in the open state.

A lid 2 is fastened to a main body 1 with a pin (not shown) to form a valve casing having a valve chamber 4 therein.

A gasket 5 is interposed between the main body 1 and M2 to keep them airtight.

An inlet 6 is formed in the upper part of the lid 2, and an outlet lower part is formed in the lower part. The inlet 6 communicates with the upper part of the valve chamber 4 and is connected to steam-using equipment (not shown).
etc. to introduce condensate into the valve chamber 4. A valve seat member 8 is screwed to the lower part of M2, the valve chamber 4 and the outlet lower are communicated through a valve port 9 formed in the valve seat member 8, and condensate in the valve chamber 4 is guided to the outlet lower.

The inlet 6 and the outlet lower are opened in the horizontal direction, and each form a female thread for piping.

A first lever 11 is attached to the lid 2 with a pin 12 and connected with a hinge. Rollers 13a, 1 are attached to the other end of the arm of the first lever 11.
A recess 18 is formed at 3b, and a hollow spherical float 14 made of thin stainless steel plate is connected thereto. The float "14 floats on the condensate accumulated in the valve chamber 4, rotates about the pin 12, and rises and falls along with the liquid level.

Attach the second lever 15 to M2 with the pin 16 and connect it with a hinge. One end of the second lever 15 passes through the recess 8 of the first lever 11, and the other end is connected to -@19a of a coil spring 19 as an elastic member. The second lever 15 receives a rotational force due to the tensile force of the coil spring 19 using the pin 16 as a fulcrum (in FIG. 1, it receives a rotational force in a counterclockwise direction). One end of the second lever 15 extends upward at an acute angle with respect to the displacement of the float 14 in the valve opening direction. 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 using a pin 21 to form a hinge connection. Valve body 17 that opens and closes the valve port 9 on the third lever 20
Attach with a snap ring. The other end 20a of the third lever 20 is arranged to face the shaft of the second lever 15.

The operation of the above steam trap is as follows.

Population 6 is connected to condensate generation points such as steam-using equipment. Condensate and steam flow into the valve chamber 4, where the condensate is separated and accumulated in the lower part and the steam is separated in the upper part. The float 14 is the pin of the second lever 15]
2 as a fulcrum, it floats up as the liquid level in the valve chamber 4 rises, and rotates the second lever 15 clockwise via the rollers 138, 13b. In this case, the buoyant force of the float 4 acts on the second lever 15 as an amplified wedge force. A 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 contacting the pin 1, the lower end of the second lever 15, that is, the connecting portion with the one end 19a of the coil spring 19
6 , the rotational force of the coil spring ] 9 changes in the clockwise direction around the pin 16 . This clockwise rotational force and the enlarged wedge force cause the valve body 17 to open the valve port 9 (the state shown in FIG. 2), and the condensate in the valve chamber 4 is discharged from the valve port 9 to the outlet lower. Ru.

When the liquid level falls due to discharge, the float 14 descends, and as the float 1/I descends, the second lever 15 rotates counterclockwise. In this case as well, the weight of the float 14 acts on the second lever 15 as an enlarged wedge force. The second lever 15 rotates and its lower end
When the lever 20 is no longer involved in the other end 20a, the valve body 17
closes the valve port 9 and prevents steam from flowing out. This kind of operation is repeated automatically.

In the above embodiment, the float 14 includes the roller 13a,
Since it comes into contact with the second lever 15 via 13b and is displaced,
There is rolling friction resistance between the roller and the second lever 15, so that the displacement resistance can be made smaller.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a closed float type steamer 1-lap according to an embodiment of the present invention in a closed state, and FIG. 2 is a cross-sectional view of the same in an open state. 1: Main body 4: Valve chamber 7: Outlet 11: First lever 2 2M 6: Population 9: Valve port 14: Float 15: Second lever 17: Valve body

Claims (1)

[Claims] 1. Form an inlet, a valve chamber, and an outlet with the valve casing, form a valve port that communicates the valve chamber and the outlet, connect a float to the other end of the first lever installed inside the valve chamber with one end as a fulcrum, A recess is formed in the arm portion of the first lever, and a second lever that passes through the recess and is installed in the valve chamber with the central portion as a fulcrum is inclined at an acute angle with respect to displacement of the float in the valve opening direction. Attachment: an elastic member is connected to one end of the second lever so as to be rotatable about a fulcrum, and a third valve is attached with a valve body for opening and closing the valve port.
A float valve in which one end of the lever is disposed opposite to one end of the second lever, and the other end is installed in a valve chamber with the other end as a fulcrum.