JPH0280894A - Float valve - Google Patents

Abstract

PURPOSE:To obtain a large valve opening force by installing a lever having a valve element for opening and closing a valve opening in a valve chest with a gradient of an acute angle to the displacement of a float, and disposing a float receiving member made of fluororesin on a contacting portion between the lever and the float. CONSTITUTION:A float 11 disposed in the free state in a valve chest 4 is displaced up and down with the liquid level in the valve chest and is adapted to float or descend to be brought into contact with a lever 13. As the lever 13 is inclined at an acute angle with respect to the displacement in the valve opening direction of the float 11, a buoyancy or dead load of the float 11 is enlarged as wedge force for the lever to increase the valve opening force of a valve element 15 for a valve opening 9. A float receiving member 20 formed by fluororesin having a small coefficient of friction is disposed on a contacting portion between the float 11 and the lever 13, so that frictional resistance is lessened. Thus, a large valve opening force can be obtained without increasing the size of the float or the length of the lever, and the float will not be caught so as to accomplish reliable operation.

Description

Detailed Description of the Invention: Industrial Application Field The present invention utilizes the difference in specific gravity between a gas and a liquid to drive a valve means with an open or closed float to automatically drain one fluid from a gas-liquid mixing system. Regarding the structure of a float valve for discharging.

The float valve is used to selectively and automatically discharge either gas or liquid from a system in which gas and liquid coexist. Steam traps that automatically discharge condensate generated in steam piping systems, air traps that automatically discharge condensed water generated in compressed air piping systems, and air vents that automatically discharge air mixed in water 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 surface. Float valves take advantage of these natural laws. Gas and liquid are separated in a valve chamber, a valve port is placed in the upper or lower part of the valve chamber, and the valve means is activated by the vertical movement of a float housed in the valve chamber. It is driven to open and close the valve port and selectively and automatically discharge one of the fluids.

Conventional technology A conventional float valve uses a float to drive the valve means to open and close the valve port.The 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 the valve port is located near the fulcrum. It is equipped with a valve body that opens and closes. Alternatively, a float may be attached to one end of the lever, a valve body for opening and closing the valve port may be attached to the other end of the lever, and the float may be attached to the valve chamber using a fulcrum near the valve body.

Problems to be Solved by the Present Invention Regarding the above-mentioned problems, in order to increase the discharge capacity,
In other words, in order to obtain a large valve opening force, the float must be made larger to increase the buoyancy and dead weight, and the lever must be lengthened to increase the buoyant force and dead weight acting on the valve body. I had a problem that was getting bigger.

In addition, as a mechanism for increasing the discharge capacity, there is a pilot valve mechanism that uses a float valve as a pilot valve to open and close a large main valve port, but the structure is complicated and may cause malfunction due to the phenomenon of the valve part getting caught. There was an easy problem.

Therefore, the technical problem of the present invention is to obtain a large valve opening force without increasing the size of the float or lengthening the lever, to increase the discharge capacity, and to achieve reliable operation by eliminating the catching phenomenon of the valve part. This can be achieved by obtaining a high float valve.

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 is formed that communicates the valve chamber with the outlet, a float is placed in the valve chamber in a free state, and a lever with a valve body that opens and closes the valve port is tilted at an acute angle with respect to the displacement of the float in the valve opening direction. At least it is attached to the valve chamber, and a float receiving member made of fluororesin is arranged at the contact portion of the float and the lever.

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

The float, which is placed in a free state within the valve chamber, is displaced up and down along with the liquid level within the valve chamber. The float, which floats or descends and is displaced in the valve opening direction, comes into contact with 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 or dead weight of the float is magnified and acts as a wedge force on the lever. Therefore, floats of the same size,
Even if levers of the same length are used, the valve opening force can be increased.

An expanded wedge force acts on the float as a reaction force to the valve opening force, but since a float receiving member made of fluororesin with a small coefficient of friction is placed at the contact area between the float and the lever, the float The frictional resistance between the lever and the lever is small.

Effect of the invention The present invention produces the following unique effects.

By expanding and utilizing buoyancy or self-weight as a wedge force, a large valve opening force can be obtained without increasing the size of the float or lengthening the lever, and the casing can be made smaller.

Also, the frictional resistance between the float and lever is reduced,
The float will not get caught and will work reliably.

Embodiment An embodiment illustrating a specific example of the above technical means will be described. (
(See Figures 1 to 4) This embodiment is applied to a closed float type steam trap.

FIG. 1 shows the trap in its open state, and FIG. 2 shows it in its closed state.

A lid 2 is fastened to a main body 1 with a bolt 3 to form a valve casing having a valve chamber 4 inside. A gasket 5 is interposed between the main body 1 and the body 2 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 the lid 2, 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 gasket 10 maintains airtightness between the valve seat member 8 and M2.

A hollow spherical float 11 made of a thin stainless steel plate is housed in a valve chamber 4 in a free state. The float 11 floats on the condensate accumulated in the valve chamber 4 and rises and falls with the liquid level.

Attach the lever attachment member 12 to the lid 2 with screws (not shown). The lever 13 is attached to the lever attachment member 12 with a pin 14. A valve body 15 for opening and closing the valve port 9 is attached to the lever 13. Therefore, the lever 13 can rotate using the pin 14 as a fulcrum. One knob is formed on the lever 13 to improve its strength.

The upper part of lever 13 moves from flow 1 to 11 at an angle α from the vertical line.
It extends diagonally upward. Reference number 17 is a rib that guides the float 11 in the vertical direction.
A slight gap is formed between the float 11 and the float 11.

Attach bimetal 18 to M2 with screw 19.

The bimetal 1B has a substantially zero-shaped shape and expands when the temperature is low, exerting the force that pushes up the lever 13 to open the valve, and narrows when the temperature is high, changing its shape so that it does not engage the lever 13.

A float receiving member 20 made of fluororesin is attached above the lever 13 at a position where it comes into contact with the float 11. The float receiving member 20, as shown in an enlarged cross-sectional view in FIG. 3 (FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3),
It has a T-shaped cross section and has a leg portion 21 that passes through a vertically elongated through hole 22 provided on the lever 13 and is fixed with a fixing pin 23, allowing the lower end to slide to a position where it touches a stepped portion 25 provided on the lever 13. The contact with the float 11 is maintained by this.

The operation of the 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 11 floats up as the liquid level within the valve chamber 4 rises and comes into contact with the float receiving member 20 of the lever 13 and the side wall 16. When the liquid level further rises, the buoyant force of the float increases, and the buoyant force acts on the lever 13 as a lateral force. This lateral force causes the lever 13 to rotate in the valve opening direction (clockwise in FIG. 1), causing the valve body 5 to open the valve port 9.

As the float 11 rises, the float receiving member 20 also rises (the state shown in FIG. 3). Since the float receiving member 20 is made of fluororesin with a small coefficient of friction,
The float 11 rises smoothly without getting caught.

Condensate in the valve chamber 4 is discharged from the valve port 9 to the outlet lower. When the liquid level lowers due to discharge, the float 11 also lowers. In this case, the float 11 descends smoothly in the same way as when it ascends. Note that even if the side wall 16 is not particularly provided with fluororesin or the like, the float 11 can slide up and down while rotating because the float 11 slides on the float receiving member 20. As the float descends, the lever 13 rotates in the valve closing direction, and the valve body 15 closes the valve port 9, preventing steam from flowing out. This kind of operation is automatically repeated.

Incidentally, the float valve shown in the above embodiment can also be used as an air trap for automatically discharging condensed water from the compressed air piping system, rather than as a stream trap. Moreover, if the arrangement shown in FIGS. 1 and 2 is turned upside down, it can also be used as an air vent for automatically discharging air from the water piping system.

Although the above embodiments use spherical floats, the present invention is not limited thereto, and floats of any shape, for example cylindrical, may be used.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a float type steam trap according to an embodiment of the present invention when the valve is open, FIG. 2 is a cross-sectional view of the steam trap according to the present invention when the valve is closed, and FIG. 2 is a partially enlarged cross-sectional view of a part of the lever, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3. 1: Main body 2 4: Valve chamber 6 7: Outlet 9 11: Float 13 15: Valve body 20 21: Foot 22 Lid artificial valve port lever float receiving member through hole

Claims (1)

[Claims] 1. A lever with a valve casing that forms an inlet, a valve chamber, and an outlet, a valve port that communicates the valve chamber and the outlet, a float placed in the valve chamber in a free state, and a valve body that opens and closes the valve port. is attached to the valve chamber at an acute angle with respect to the displacement of the float in the valve opening direction, and a float receiving member made of fluororesin is arranged at the abutting part of the float and the lever.