JPH0280896A - Float valve - Google Patents

Abstract

PURPOSE:To obtain a large valve opening force by installing plural levers having valve elements for opening and closing the respective valve openings on a valve chest in such a manner as to surround a float and be inclined at an acute angle with respect to the displacement in the valve opening direction of the float. CONSTITUTION:A float 11 is disposed in the free state in a valve chest 4, and plural levers 13a, 13b having valve elements 15a, 15b for opening and closing the respective valve openings 9a, 9b are installed in the valve chest 4 in such a manner as to surround the float 11 and be inclined at an acute angle with respect to the displacement in the valve opening direction of the float. The float 11 is displaced up and down with the liquid level in the valve chest 4 and brought into contact with the levers 13a, 13b. As the lever is inclined at an acute angle, the buoyancy or dead load of the float 11 works on the lever as wedge force to increase the valve opening force and open the plural valve openings 9a, 9b. Thus, plural valve openings can be opened at one time.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention utilizes the difference in specific gravity between gas and liquid to drive a valve means with an open or closed float to automatically drain one fluid from a gas-liquid mixing system. related to the structure of a float valve that discharges water.

The float valve is used to selectively and automatically discharge either gas or liquid from a system in which gas and liquid coexist. Steam trap automatically discharges condensate generated in the steam piping system, Air 1~Lap automatically discharges condensed water generated in the compressed air piping system, and automatically discharges air mixed in the 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, 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.

<Prior art> A conventional float valve, which uses a float to drive the valve means to open and close the valve port, has a float attached to one end of a lever, the other end of the lever as a fulcrum, attached to the valve chamber, and a valve opening 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 maximize the discharge capacity,
In other words, in order to obtain a large valve-opening force, it is necessary to increase the buoyancy and self-weight by increasing the lever, or to increase the magnification ratio of the buoyant force and self-weight acting on the valve body by making the lever longer.
The problem was that the casing became too large.

Therefore, the technical problem of the present invention is to enable a large valve opening force of 1q 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 plurality of valve ports are formed to communicate between the valve chamber and the outlet, a float is placed in the valve chamber in a free state, and a plurality of levers each equipped with a valve body for opening and closing each valve port are arranged so as to surround the float. These valves are installed in 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, 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 flow i~ which floats or descends and is displaced in the valve opening direction comes into contact with each lever. Since each 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 lateral force against the lever. Therefore, even if you use floats of the same size and levers of the same length, you can increase the opening force, and moreover, you can open multiple valve ports with one float. .

<Example> An example will be described without showing a specific example of the above technical means. (
(See Figure 1) This embodiment is applied to a closed float type steam trap, and the number of valve ports is two.

The lids 2a, b are fastened to the main body 1 with bolts 3a, b to form a valve casing having a valve chamber 4 therein.

Gaskets 5a, b are interposed between the main body 1 and i2a, b to keep them airtight.

Inlets 6a, b are provided at the top of the lids 2a, b, and exits 6a, b are provided at the bottom of the lids 2a, b.
form b. The populations 6a and b communicate with the upper part of the valve chamber 4,
Connect to steam-using equipment (not shown), etc., and transfer condensate to the valve chamber 4.
to be introduced within. Valve seat members 3a, b are screwed to the lower portions of the lids 2a, b, and valve ports 9a, b are formed in the valve seat members aa, b.
The valve chamber 4 and the outlet lowers a, b are communicated through the valve chamber 4, and the condensate in the valve chamber 4 is led out to the outlet lowers a, b. Inlets 6a, b and outlet lower a.

b opens in the horizontal direction, and each forms a female thread for piping. Airtightness between the valve seat members sa, b and the lids 2a, b is maintained by gaskets 10a, b.

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.

A lever mounting member 12a is provided on each lid 2a, b.

Attach b with screws (not shown). Lever mounting member'
Lever 13a, b to pin 14a to 12a, b.

b and attach it. A valve port 9a is provided on the levers 13a, b.

Attach valve bodies 15a and 15b that open and close b. Therefore, the levers 13a, b can rotate around the pins 14a, b as fulcrums. Each lever has ribs to improve its strength. Lever 13a.

The upper part of b extends diagonally above the float 11 at an angle α from the vertical line. The reference amount @17 is a rib that guides the float 11 in the vertical direction, and is formed at two locations in total, one on the near side of the page, and a slight gap is formed between it and the flows i to 11.

Bimetal 18a, b to ff12a, b with screw 19a,
Attach with b. The bimetals 18a and 18b are approximately zero-shaped and expand when the temperature is low to exert a force that pushes up the levers 13a and b to open the valve, and when the temperature is high they narrow and change to a shape that does not involve the levers 13a and b.

The operation of the above steam trap is as follows.

The inlets 6a and 6b are connected to condensate generation locations such as steam-using equipment. Of course, populations 6a and b do not need to use both.

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 levers 13a, b. When the liquid level further rises, the buoyant force of the float increases, and the buoyant force acts on each lever 13a, b as a wedge force.

This wedge force causes the levers 13a and 13b to rotate in the valve opening direction (in FIG. 1, the lever 13a is counterclockwise and the lever 13b is clockwise), and the valve bodies 15a and 15b are rotated to open the valve port 9a,
Open b. The condensate in the valve chamber 4 comes out from the valve ports 9a, b to the lower a,
b. When the liquid level drops due to discharge, the float 1 descends, and as the float descends, the lever 13a.

b rotates in the valve closing direction, and the valve bodies 15a, b close to the valve ports 9a, b.
to prevent steam from escaping. This kind of operation is automatically repeated.

When the number of valve ports and levers increases, the total valve closing force of all valve ports increases, but if the inclination angle (α) of the levers is reduced, a large output can be achieved even with the buoyancy of a float of the same size. All valve ports can be opened.

Furthermore, due to the floating of the float 11, the lever 13a is lifted.

Even if both levers 20a and 20b do not rotate at the same time, one of the levers (for example, 13a) is rotated to bring it into contact with one of the ribs 20a and 20b provided in the valve chamber 4 (20a). Then the float floats up further and the other lever (
13b) can be rotated C to open the valve port, so there is no problem.

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

If a pilot valve mechanism is used to increase the discharge capacity, the structure becomes complicated. In the present invention, the structure is simple because the lever is simply tilted at an acute angle in response to the displacement of the float in the valve opening direction.

Furthermore, since multiple valve ports can be opened at once by making good use of the wedge effect, a large volume of condensate can be discharged with a small valve housing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a closed float type steam trap according to an embodiment of the float valve of the present invention. 1: Main body 4: Valve chamber 7a, b: Outlet 11: Float 15a, b: Valve body 2: M 6a, b: Population 9a, b: Valve port 13a, b Nilever

Claims (1)

[Claims] 1. An inlet, a valve chamber, and an outlet are formed in the valve casing, a plurality of valve ports are formed to communicate the valve chamber and the outlet, a float is placed in the valve chamber in a free state, and a valve body is provided to open and close each valve port. A float valve in which a plurality of levers are attached to the valve chamber so as to surround the float, and each lever is inclined at an acute angle with respect to the displacement of the float in the valve opening direction.