JPH0280897A - 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 with respect to the displacement in the valve opening direction of a float. CONSTITUTION:A float 11 is disposed in the free state in a valve chest 4, and a lever 13 having a valve element for opening and closing a valve opening 9 is installed in the valve chest 4 with a gradient of an acute angle with respect to the displacement in the valve opening direction of the float 11. The float 11 is displaced up and down with the liquid level in the valve chest 4 and brought into contact with the lever 13. As the lever 13 is inclined at an acute angle, the buoyancy or dead load of the float 11 works on the lever 13 as wedge force to increase the valve opening force. Thus, the lever is just inclined at an acute angle to the displacement in the valve opening direction of the float, so that the structure of the float valve can be simplified and reliable valve opening operation can be attained.

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. A steam trap that automatically discharges condensate generated in a steam piping system, a wrap to air 1 that automatically discharges condensed water generated in a compressed air piping system, and a wrap that automatically discharges air mixed in a water piping system. Air vents, 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 the valve chamber, the valve opening is placed at the top or bottom of the valve chamber, and the valve is activated by the vertical movement of a float housed in the valve chamber. The means is driven to open and close the valve port to 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.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 the valve opening is opened and closed near the fulcrum. It is equipped with a valve body. A float is attached to one end of the lever, a valve body for opening and closing the valve port is attached to the other end of the lever, and the valve body is 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 magnification ratio of the buoyant force and dead weight acting on the valve body.
There was a problem with the casing becoming too large.

Therefore, the technical problem of the present invention is to make it possible to obtain a large valve opening force without increasing the size of the float or lengthening the lever.

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 was attached to the valve chamber.

action The effect of the above technical means is weakened 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 is displaced in the valve opening direction by floating or descending, 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 acts as a proofing force on the lever.

Therefore, even if a float of the same size and a lever of the same length are used, the valve opening force can be increased.

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

A device that uses a multiple valve mechanism or a pilot valve mechanism to increase the discharge capacity has a complicated structure.

In the present invention, the structure is simple because the lever is only tilted at an acute angle in response to the displacement of the float in the valve opening direction.

Example An example showing a specific example of the above technical means will be described.

Example 1 (See Figure 1) This example is applied to a closed float type steam trap.

M2 is fastened to the main body 1 with bolts 3 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 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. Airtightness between the valve seat member 8 and the lid 2 is maintained by a gasket 10.

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. Ribs are formed on the lever 13 to improve its strength.

The upper part of the lever 13 is attached to the float 11 at an angle α from the vertical line.
It extends diagonally upward. A side wall 16 (on the left side in FIG. 1) of the valve chamber 4 also extends obliquely upward toward the flow 1 11 at an angle α from the vertical line. Reference numeral 17 is a rib that guides the float 11 in the vertical direction, and is formed at two locations in total, one on the front side of the page, and a slight gap is formed between it and the float 11.

Attach the bimetal 18 to the lid 2 with the hiss 19.

The bimetal 18 is approximately U-shaped and expands when the temperature is low, exerting a force that pushes up the lever 13 to open the valve, and when the temperature is high, it narrows and changes to a shape that does not engage the lever 13.

The operation of the above steam trap is as follows.

The inlet 6 is connected to a point where condensate is generated, such as in steam-using equipment. Condensate and steam flow into the valve chamber 4, and the condensate and steam are separated and accumulated in the lower part and the upper part. The float 11 rises as the liquid level within the valve chamber 4 rises and comes into contact with 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 wedge force causes the lever 13 to rotate in the valve opening direction (clockwise in FIG. 1), thereby opening the valve body 15 or the valve port 9. Condensate in the valve chamber 4 is discharged from the valve port 9 to the outlet lower. When the liquid level falls due to discharge, the float 11 descends, and as the flow i~ falls, 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.

Embodiment 2 (Refer to FIG. 2) This embodiment is also applied to the sealed 701~ type STUDIM I~ Wrap like Embodiment 1 shown in FIG. Numbers are given and explanations are omitted.

In this embodiment, the side wall 26 (left side in FIG. 2) of the valve chamber 4 is formed vertically.

The float valves shown in Examples 1 and 2 above can also be used as an air trap for automatically discharging condensed water from the compressed air piping system, rather than as a steam trap. Furthermore, 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.

Embodiment 3 (See FIG. 3) This embodiment is applied to a downward open float type steam trap.

A lid 32 is fastened to the main body 31 with bolts 33 to form a valve chamber 3 inside.
Form a valve casing with 4. Main bodies 31 and 132
A gasket 35 is interposed between the two to maintain airtightness between the two.

An inlet 36 is provided at the bottom of the main body 31 and an outlet 37 is provided at the top of the lid 32.
form. The inlet 36 communicates with the valve chamber 34 through an introduction passage 39 and an introduction hole 40 of an introduction pipe 38 projecting upward;
Connect to steam-using equipment (not shown), etc., and transfer condensate to valve chamber 3.
It will be introduced within 4. A valve seat member 41 is screwed to the upper part of the lid 32, and the valve chamber 3 is inserted through the valve port 42 formed in the valve seat member 41.
4 and an outlet 37 to lead the condensate in the valve chamber 34 to the outlet 37. The inlet 36 and outlet 37 are formed with internal threads for piping. A gasket 43 maintains airtightness between the valve seat member 41 and the lid 32.

A downward open float 44 is accommodated in the valve chamber 34 in a free state. The float 44 is made of a thin stainless steel plate into a hollow spherical shape having a circular opening, and a cap 45 is attached to the circular opening. The cap 45 has a weight that shifts the center of gravity toward the circular opening, and has a small hole 46 in the upper part of the spherical shell.

Attach the lever attachment member 47 to the lid 32 with screws (not shown). A lever 48 is attached to the lever attachment member 47 with a pin 49. A valve body 50 that opens and closes the valve port 42 on the lever 48
Attach. Therefore, the lever 48 can rotate using the pin 49 as a fulcrum. A rib is formed on the lever 48 to improve its strength. The lower part of the lever 48 extends obliquely below the float 44 at an angle β from the vertical line. A side wall 51 (right side in FIG. 3) of the valve chamber 44 is formed in the vertical direction.

A bimetal 52 is attached to the lid 32 with screws 53. Bimetal 52 is almost 0-shaped and expands at low temperatures, causing lever 4B.
It exerts the force to open the valve by pushing down, and when the temperature is high, it narrows and changes to a shape that does not involve the lever 48.

The operation of the above steam trap is as follows.

The inlet 46 is connected to a point where condensate is generated, such as in steam-using equipment.

Condensate and steam flow into the float 44 through the inlet pipe 38, with steam flowing into the upper part of the float 44 and condensate flowing into the float 44.
4 and the outside of the float 44. When the amount of internal steam is low, the float 44 descends under its own weight, and the weight acts on the lever 4B as a wedge force. This lateral force causes the lever 48 to rotate in the valve opening direction (clockwise in FIG. 3), causing the valve body 50 to open the valve port 42. Condensate in the valve chamber 34 is discharged from the valve port 42 to the outlet 37.

When steam is introduced by the discharge and the amount of steam inside the float 44 increases, the float floats up and comes into contact with the upper end of the lever 48.
By rotating the lever 48 in the valve closing direction, the valve body 50 closes the valve port 42 and prevents steam from flowing out. When condensate flows into the inlet 36 and the supply of steam to the float 44 is stopped, the steam inside is reduced by cooling condensation and flowing out from the small hole 46, loses buoyancy and sinks.

This kind of operation is automatically repeated.

Although spherical floats are used in the above embodiments 1 to 3, the present invention is not limited to this, and may be implemented using floats of any shape, such as a cylindrical shape. Good too.

Further, although the side wall of the valve chamber is shown as being formed vertically or having the same inclination angle as the lever, it may be formed at a different inclination angle from the lever. Alternatively, it is also possible to form the lever vertically and make the side wall slope.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views of a closed float steam trap according to an embodiment of the float valve of the present invention, and FIG. 3 is a cross-sectional view of a downward-opening float steam trap according to an embodiment of the float valve of the present invention. . 1.31: Main body 2.32; Bodhisattva 4.34: Valve chamber 6.36: Inlet lower 37: Outlet
9.42: Valve port 11.44: Float 13.
48: Lever 15/50: Valve body

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.