JPH0545840B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a float valve that uses 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 the structure of

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

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, arranging a valve port within the valve chamber, and driving the valve means by the vertical movement of a float housed in the valve chamber to open the valve. It opens and closes the mouth to selectively and automatically drain liquid.

<Prior art> A conventional float valve, in which a float drives a valve means to open and close a valve port, has a float attached to one end of a lever, the other end of the lever is attached to the valve chamber as a fulcrum, and the valve opening is located near the fulcrum. It is equipped with a valve body that opens and closes the valve. Alternatively, 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> In the above, in order to increase the discharge capacity, in other words, in order to obtain valve opening force and sufficient valve lift, it is necessary to increase the float. The buoyancy force acting on the valve body must be increased by increasing the buoyancy force by increasing the buoyancy force by increasing the buoyancy force by increasing the buoyancy force by increasing the length of the lever, resulting in a problem that the casing becomes larger.

Therefore, the technical problem of the present invention is to obtain a float valve which can obtain a large valve opening force without increasing the size of the float or lengthen the lever, can obtain a sufficient amount of valve lift, and has a large discharge capacity.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems is a valve in which an inlet, a valve chamber, and an outlet are formed in a valve casing, and the valve chamber and the outlet are communicated with each other. A float is arranged in the valve chamber in a free state, and a lever to which a valve body for opening and closing the valve port is attached is installed in the valve chamber so as to be inclined at an acute angle with respect to the displacement of the float in the valve opening direction, and , so that the rotation angle of the lever increases for the same amount of rise of the float.
On the inner surface of the valve casing facing the upper part of the float,
Alternatively, an inclined portion is formed at the upper part of the lever where it comes into contact with the float.

<Effect> The operation 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 that rises 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 buoyant force of the float is magnified and acts on the lever as a wedge 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.

Since the slope is formed at the contact point of the float, even if the float rises, the opening ratio of the valve port, that is, the increase in valve lift relative to the float rise, does not decrease, resulting in a small float rise. A sufficient amount of valve lift can be obtained. In other words, if there is no slope, the lever angle with respect to the float's rising direction will become smaller as the float rises, and as it becomes smaller, the increase in valve lift relative to the float's rising amount, that is, the opening ratio, will also become smaller, and the required valve lift will decrease. In order to secure the desired amount, the float needs to rise a large amount, and the valve casing also becomes large.

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

By expanding and utilizing buoyancy 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.

In addition, the opening ratio of the valve port does not decrease even when the float rises, and a sufficient valve lift can be obtained with a small displacement of the float, and the casing can be made smaller to ensure a large discharge capacity. .

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

1st embodiment (see Figures 1 to 3) Figure 1 shows the trap in a closed state, Figure 2 shows it in an open state, and Figure 3 shows the flow of the float from closing to opening. This shows the displacement.

A lid 2 is fastened to a 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 7 is formed in the lower part. The inlet 6 communicates with the upper part of the valve chamber 4, is connected to steam-using equipment (not shown), etc., and introduces condensate into the valve chamber 4. A valve seat member 8 is screwed to the lower part of the lid 2, and the valve chamber 4 is inserted through the valve port 9 formed in the valve seat member 8.
and the outlet 7 to lead the condensate in the valve chamber 4 to the outlet 7. The inlet 6 and outlet 7 open horizontally and each form an internal thread for piping. Valve seat member 8
A gasket 10 maintains airtightness between the lid 2 and the lid 2.

A hollow spherical float 11 made of a thin stainless steel plate is housed in the valve chamber 4 in a free state. float 1
1 floats on the condensate accumulated in the valve chamber 4 and rises and falls with the liquid level.

An inclined portion 20 is formed above the main body 1 at a location where the float 11 abuts when it rises.

Attach the lever mounting member 12 to the lid 2 with a screw (not shown)
Attach it with Attach the lever 13 to the lever mounting member 12.
Attach with 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 extends diagonally above the float 11 at an angle α (see FIG. 1) from the vertical line. Reference numeral 17 is a rib that guides the float 11 in the vertical direction, and is formed at three locations in total, including on the front side of the page, and a slight gap is formed between the rib and the float 11.

Attach the bimetal 18 of the lid 2 with the screws 19. The bimetal 18 is approximately U-shaped and expands when the temperature is low to exert 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 state shown in the figure).

The operation of the 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. The float 11 rises as the liquid level within the valve chamber 4 rises and comes into contact with the lever 13. When the liquid level further rises, the buoyancy of the float increases, and the buoyancy is magnified as a wedge force that acts on the lever 13. Due to this wedge force, the lever 13
rotates in the valve opening direction (clockwise in FIG. 1), and the valve body 15 slightly opens the valve port 9. Then, as the liquid level further rises, the float 11 moves to the third position.
As shown by the solid line and the dashed-dotted line in the figure, the valve port 9 is fully opened by moving to the upper right while contacting the inclined portion 20 of the main body 1 (the state shown in FIG. 2). When the liquid level drops due to discharge, the float 11 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.

Second Embodiment (See FIG. 4) In this embodiment, the same members as those in the first embodiment are designated by the same reference numerals, and a detailed explanation of the steam trap will be omitted.

A sloped portion 13a is formed in the upper part of the lever 13 as a contact point with the float 11. float 11
Even if the angle of inclination of the lever 13 with respect to the vertical line becomes smaller due to the displacement along the inclined portion 13a, the amount of movement of the valve body 15 in the opening direction, that is, the amount of valve lift, does not become smaller. Therefore, a sufficient valve lift can be obtained and a large discharge capacity can be secured.

Incidentally, the inclined portions 20 and 13a function in substantially the same manner whether they are linear or curved.

Furthermore, by appropriately determining the inclination angles of the inclination parts 20 and 13a, the aperture ratio can be made constant or increased in accordance with the rise of the float 11.

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 steam trap.

[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 closed, FIG. 2 is a cross-sectional view of the steam trap according to the present invention when the valve is open, and FIG. 2 is a sectional view showing the state of displacement of the float, and FIG. 4 is a sectional view of a float type steam trap according to another embodiment of the present invention. 1: Main body, 2: Lid, 4: Valve chamber, 6: Inlet, 7:
Outlet, 9: Valve port, 11: Float, 13: Lever, 13a, 20: Inclined part.

Claims (1)

[Claims] 1 Form the inlet, valve chamber, and outlet with the 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 install it inside the valve chamber, and make sure that the inner surface of the valve casing facing the upper part of the float or the upper part of the lever is in contact with the float so that the rotation angle of the lever becomes larger for the same amount of rise of the float. A float valve with a sloped part at the contact point.