JPH02245600A - Float valve - Google Patents

Abstract

PURPOSE:To enable the increase of a valve opening lift of a valve body without enlarging a valve chamber by driving a first and a second levers with the displacement of a float, and moving a supporting point of the first lever, to which a valve body for switching a valve port is attached, to the side separated from the valve port. CONSTITUTION:When the condensate and the steam are flowed into a valve chamber 4 and the condensate is separated to be settled in the lower and the steam is separated to be settled in the upper, a float 11 is floated with the rise of the liquid surface in the valve chamber 4 to abut on a first lever 13 and a side wall 16. When the float is further raised from the liquid surface, the buoyancy of the float 11 is enlarged to work to the lever 13 as a wedging force, and the lever 13 is rotated in the valve opening direction, using a supporting point 14 positioned in a valve port 9 side in a long hole 3 as a supporting point, and abuts on one end of a second lever 20 to rotate the lever 20 and rotates further. At this stage, the other end of the lever 20 displaces the supporting point 14 of the lever 13 to the side separated from the valve port 9 in the long hole 3 while the lever 29 is being rotated. The condensation in the valve chamber 4 is thereby exhausted from the valve port 9 to an outlet 7, and when the liquid surface lowers, the float 11 falls down and a valve body 15 seals the valve port 9 to prevent the exhaust of the steam.

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. It is attached to the valve chamber using the fulcrum near the .

Problems to be Solved by the Present Invention Regarding the above problems, in order to increase the opening lift of the valve body, it is necessary to increase the amount of displacement of the float, which causes the problem that the valve chamber, that is, the casing becomes large. there were.

Therefore, the technical problem of the present invention is to increase the opening lift of the valve body without enlarging the valve chamber.

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 first lever, which forms a valve opening that communicates the valve chamber and the outlet, and has a valve element attached to one end that opens and closes the valve opening, is rotatably attached to the valve chamber using a fulcrum near the valve element, and is floated inside the valve chamber. In the float valve, the fulcrum is located in the elongated hole, and the first lever rotated in the valve-opening direction comes into contact with the end of the float valve. The other end has a second lever attached inside the valve chamber for moving the fulcrum to the side away from the valve opening in the elongated hole.

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

The float housed in the valve chamber is displaced up and down along with the liquid level in the valve chamber. The float, which floats or descends and is displaced in the valve opening direction, operates the other end of the lever, and rotates the first lever in the valve opening direction with the valve opening side in the elongated hole as a fulcrum. The first lever rotated in the valve opening direction contacts one end of the second lever, and rotates roughly in the valve opening direction while rotating the second lever. At this time, the other end of the second lever moves the fulcrum of the first lever to the side away from the valve opening in the elongated hole.

In this way, the first and second levers are driven by the displacement of the float, and the fulcrum of the first lever, to which the valve body that opens and closes the valve opening is attached, moves to the side away from the valve opening. The opening lift of the body increases.

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

As described above, according to the present invention, the opening lift of the valve body can be increased without increasing the size of the casing, so the discharge capacity can be increased even with a small trap.

Embodiment An embodiment illustrating a specific example of the above-mentioned technical means will be described (see FIGS. 1 and 2).

This embodiment is applied to a closed float type steam trap. Note that FIG. 1 shows the valve in the closed state, and FIG. 2 shows the valve in the open state.

A lid 2 is fastened to a main body 1 with bolts (not shown) to form a valve casing having a valve chamber 4 therein.

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 1Q.

A hollow spherical float 11 made of a thin stainless steel plate is housed in the valve v4 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.

A lever attachment member 12 is formed on the lid 2. A long hole 3 is formed in the lever mounting member 12. The first lever 13 is attached to the elongated hole 3 of the lever attachment member 12 with a pin. The bottle forms the fulcrum 14. Therefore, the first lever 13 can rotate about the fulcrum 14.

Further, the fulcrum 14 can move within the elongated hole 3.

Attach the second lever 20 to M2. The second lever 20 can rotate about the fulcrum 21. One end of the second lever 20 extends obliquely upward to near the first lever 13 so as to come into contact with the first lever 13 rotating in the valve opening direction. The other end extends to the position of the fulcrum 4 so that the fulcrum 14 of the first lever 13 positioned within the elongated hole 3 can be driven.

A valve body 15 for opening and closing the valve port 9 is attached to the first lever 13. The upper part of the first lever 13 extends diagonally above the float 11 at an angle α from the vertical line.

A side wall 16 (left side in FIG. 1) of the valve chamber 4 extends vertically. 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 screws 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. The float 11 rises as the liquid level within the valve chamber 4 rises and comes into contact with the first lever 13 and the side wall 16. As the liquid level further rises, the buoyancy of the float 11 increases,
The buoyant force acts on the first lever 13 as a wedge force. This wedge force causes the first lever 13 to rotate in the valve opening direction (clockwise in FIG. 1) about a fulcrum 14 located in the elongated hole 3 on the valve port 9 side. First lever 13 rotating in the valve opening direction
contacts one end of the second lever 20 and rotates roughly while rotating the second lever.

At this time, the other end of the second lever 20 is connected to the first lever 13.
rotates while displacing the fulcrum 14 of the elongated hole 3 to the side away from the valve port 9. In this way, the condensate in the valve chamber 4 is discharged from the valve port 9 to the lower outlet.

When the liquid level drops due to discharge, the float 11 descends, and as the float descends, the first lever 13 and the second lever
The lever 20 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.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a sealed float type steam trap according to an embodiment of the present invention in a closed state, and FIG. 2 is a sectional view showing the same in an open state. 1: Main body 2: Lid 3: Long hole 4: Valve chamber 6; Inlet 7: Outlet 9: Valve port 11; Float 13: First lever ]4. Fulcrum 15: Valve body 20: 2nd lever grass 11 Illusion! lr 艷本paid ball

Claims (1)

[Claims] 1. An inlet, a valve chamber, and an outlet are formed in the valve casing, a valve opening is formed to communicate the valve chamber and the outlet, and a first lever with a valve element attached to one end that opens and closes the valve opening is moved near the valve element. In a float valve that is rotatably attached to a valve chamber as a fulcrum, a float is accommodated in the valve chamber, and the other end of the first lever is driven by the vertical movement of the float, in which the fulcrum is located in an elongated hole. A float valve having a second lever mounted inside the valve chamber, the first lever rotated in the valve opening direction abutting one end and the other end moving the fulcrum to the side away from the valve opening in the elongated hole.