JPH02102997A - Float valve - Google Patents

Abstract

PURPOSE:To obtain a float valve having large valve opening force and large discharge capacity by installing a lever fitted with a valve element with an acute-angle gradient with respect to the displacement in the valve opening direction of a float in a valve chest to form an inclined portion in a portion contacting the float in a steam trap for automatically discharging condensate. CONSTITUTION:An inlet 6 is connected to a condensate generating portion of an apparatus using steam or the like. Condensate and steam flow in a valve chest 4 and separate from each other, so that the condensate stays in the lower portion thereof and the steam stays in the upper portion thereof. A float 11 rises with rising of the liquid level in the valve chest 4 to be brought into contact with a lever 13. When the liquid level is further raised, the buoyancy of the float is increased so that the buoyancy is enlarged as a wedge force to work on the lever 13. By this wedge force, the lever 13 is rotated in the valve opening direction so that a valve element 15 a little opens a valve opening 9. The further rising of the liquid level causes the float 11 to be moved upward on the right while being pressed to an inclined portion 20 of a main body 1, so that the valve opening 9 is fully opened.

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. 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 according to changes in the 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. 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 a large valve opening force and a sufficient amount of valve lift, it is necessary to increase the buoyancy force by tightening the float or by increasing the magnification ratio of the buoyancy force acting on the valve body by lengthening the lever. Therefore, there was a problem that the casing became large.

Therefore, the technical problem of the present invention is to obtain a float valve that can obtain a large valve opening force without increasing the size of the float or lengthening the lever, as well as a sufficient valve lift and a large discharge capacity.

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 install it inside the valve chamber, and place it in contact with the float so that the opening ratio of the valve port, that is, the increase in valve lift with respect to the rise m of the float, increases or does not decrease as the float rises. A sloped portion is formed on the top.

<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 as a wedge force against the lever and moves. Therefore, even if floats of the same size and levers of the same length are used, the valve opening force can be increased.

Since an inclined part 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 amount of rise of the float, does not decrease, resulting in less float rise. A sufficient amount of valve lift can be obtained with this amount. That is, if there is no slope, the lever angle with respect to the rising direction of the float becomes smaller as the float rises, and as it becomes smaller, the lever angle with respect to the rising direction of the float becomes smaller.

The increase in valve lift, that is, the opening ratio, decreases, and in order to secure the necessary valve lift, a large amount of lift of the float is required, 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 making the float too large 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. Furthermore, the casing can be made smaller to ensure a large discharge capacity. can.

<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 state in which the i~clap valve is closed, Figure 2 shows the state in which the valve is opened, and Figure 3 shows the float from closing to opening. This shows the displacement of .

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 lower part is formed in the lower part. The port 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 806 and the lower outlet open horizontally, each forming 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 stainless steel l11M plate is accommodated in the valve chamber 4 in a free state. The float 11 is the valve chamber 4
It floats on the condensate that collects in the water 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 attachment member 12 to the lid 2 with screws (not shown). A lever 13 is attached to a 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 top of the lever 13 is at an angle α from the vertical line (see Figure 1)
and extends diagonally above the float 11. 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 to the lid 2 with screws 19.

The bimetal 18 has a substantially zero-shaped shape 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 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. 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 buoyant force of the float increases, and the buoyant force is magnified as a test force and acts on the lever 13. This detection force causes the lever 13 to rotate in the valve opening direction (clockwise in FIG. 1), causing the valve body 15 to slightly open the valve port 9. Then, as the liquid level further rises, the float 11 moves upward and to the right while contacting the inclined portion 20 of the main body 1, as shown by the solid line and the dashed-dotted line in FIG. 3, and fully opens the valve port 9 ( (state shown in FIG. 2). When the liquid level drops due to discharge, the float 11 also 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 (Refer to FIG. 4) In this embodiment, the same members as in the first embodiment are given 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. Even if the float 11 rises, it is displaced along the inclined portion 13a, and even though the angle of inclination of the lever 13 with respect to the vertical line becomes small, the amount of movement of the valve body 15 in the opening direction, that is, the amount of valve lift is small. Therefore, sufficient valve lift can be obtained and a large discharge capacity can be secured.

It should be noted that the sloped portion 20.138 acts in the same manner whether it is straight or curved.

Further, by appropriately determining the inclination angle of the inclined portion 20.13a, the aperture ratio can be made constant or increased as the float 11 rises.

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

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 installed in the valve chamber at an acute angle with respect to the displacement of the float in the valve opening direction, and is in contact with the float so that the opening ratio of the valve port increases or does not decrease as the float rises. Float valve with sloped parts.