JPH0280895A - Float valve - Google Patents

Abstract

PURPOSE:To obtain a large valve opening force by guiding a cylindrical or conical float in the vertical direction to be disposed in a valve chest and installing a lever having a valve element in the valve chest with a gradient of an acute angle to the displacement of the float. CONSTITUTION:A float 11 formed like a cylinder or a cone is guided in the vertical direction and disposed in a valve chest 4. A lever 13 having a valve element 15 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 displacement in the valve opening direction of the float 11. The float 11 is guided by a guide means 6, displaced in the vertical direction 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, buoyancy or dead load of the float 11 works on the lever as a wedge force to increase the valve opening force. Thus, the inclination of the float will not cause a change of contacting position with the lever so as to keep a large valve opening force.

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, separating gas and liquid in a valve chamber, placing a valve port at the top or bottom of the valve chamber, and operating the valve means 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 flow (- drives the valve means to open and close the valve port.A conventional float valve has a float 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 placed near the fulcrum. It is equipped with a valve body that opens and closes the
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 maximize 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.

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 communicating between the valve chamber and the outlet is formed, a cylindrical or conical float is vertically guided and placed inside the valve chamber, and a lever equipped with a valve body that opens and closes the valve port is attached to the flow 1. A valve attached to the valve chamber at an acute angle with respect to the displacement in the valve opening direction.

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

The float is guided by the guide means and is displaced in the vertical direction together with the liquid level in the valve chamber. The float, which rises or descends and is displaced in the valve opening direction, comes into contact with the lever. The guide means prevents the float formed in a cylindrical or conical shape from tilting and displacing in the vertical direction and changing the contact position 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 on the lever as a lateral force. 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.

If a multiple valve mechanism or a pyrower 1-valve mechanism is used to increase the discharge capacity, the structure will be complicated.

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

Furthermore, since the float is guided in the vertical direction and comes into contact with the lever, the position of contact with the lever can be prevented from changing due to the inclination of the float, and the valve opening force will not be reduced.

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 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 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 gasket 10 maintains airtightness between the valve seat member 8 and M2.

A guide rod 16 is erected from the bottom wall of the valve chamber 4. The guide rod 16 is formed in the vertical direction. A float 11 having a cylindrical shape and having a through hole 17 with a slightly larger diameter than the guide rod 16 is inserted into the guide rod 16 and arranged.

A sliding member (not shown) may be interposed between the guide rod 16 and the float 11 in order to reduce displacement resistance of the float 11. The float 11 floats on the condensate accumulated in the valve chamber 4,
It is guided by the guide rod 16 and floats up and down along 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. Attach the valve body 15 that opens and closes the valve port 9 to the lever 13 and pull G. Therefore, the lever 13 can rotate about the pin 14 as a fulcrum. Ribs are formed on the lever 13 to improve its strength.

The upper part of the lever 13 extends diagonally above the float 11 at an angle α from the vertical line.

Remove the bimetal 18 from the lid 2 using the screw 19.

The bimetal 18 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.

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, where the condensate is separated and accumulated in the lower part and the steam is separated in the upper part. As the liquid level in the valve chamber 4 rises, the flows 1 to 11 are guided by the guide rod 16 and float in the vertical direction, and come into contact with the lever 13 . When the liquid level further rises, the buoyancy of the float increases, and the buoyancy acts on the lever 13 as a wedge force. This wedge force causes the lever 13 to rotate in the valve opening direction (clockwise in FIG. 1), causing the valve body 15 to open 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 drops due to discharge, the float 11 is guided by the guide rod 16 and descends vertically, and as the float descends, the lever 13 rotates in the valve closing direction to close the valve body 15 or the valve port 9. , prevent steam from escaping. This kind of operation is automatically repeated.

Embodiment 2 (See Fig. 2) This embodiment is also applied to a float type steam trap like Embodiment 1 shown in Fig. 1, and the same components as in Embodiment 1 are given the same reference numbers. The explanation will be omitted.

In this embodiment, the float 21 is formed into a truncated conical shape, and is inserted into the guide rod 16 through a through hole 22 having a slightly larger diameter than the guide rod 16 .

Since the float 21 has a conical shape, the lever 13 can be shortened.

Incidentally, the float valves shown in the above-described embodiments 1 and 2 can be used not as a steam trap but as an air trap for automatically discharging condensed water from the compressed air piping system. 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.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views of a float type steam trap which is an embodiment of the float valve of the present invention. 1: Main body 2: M 4: Valve chamber 6: Lower part: Outlet 9: Valve port

Claims (1)

[Claims] 1. Form an inlet, a valve chamber, and an outlet in the valve casing, form a valve port that communicates the valve chamber and the outlet, and place a float formed in a cylindrical or conical shape in the vertical direction and placed inside the valve chamber.
A float valve in which a lever equipped with 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.