JPH074597A - Float valve - Google Patents

Abstract

PURPOSE:To provide a float valve capable of being opened and closed by the use of the same float in the extent from low pressure to high pressure with a simple structure. CONSTITUTION:An inlet 1, valve chamber 4 and outlet 2 are formed of a main body 3 and lid 5. A valve seat member 7 provided with a communicating hole 8 affording communication between the valve chamber 4 and outlet 2 is mounted on the main body 3. A tubular valve element 9 is disposed slidably in the communicating hole 8. While a float 15 is mounted on the upper part of the tubular valve element 9, the lower part of the valve element 9 is slidably arranged in a hole part 17 formed in the main body 3. A through hole 10 is provided in the tubular valve element 9 to afford communication between the valve chamber 4 and hole part 17. Turning blades 25, 26 are mounted in the through hole 10. A plurality of valve holes 19, 20 are adapted to extend through the hole part 17 of the tubular valve element 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a difference in specific gravity between gas and liquid to drive valve means by an open or closed float to selectively and automatically select one fluid from a gas-liquid mixing system. Concerning the structure of the discharge float valve. The float valve is a steam trap that automatically discharges the condensed water generated in the steam piping system, an air trap that automatically discharges the condensed water generated in the compressed air piping system, and the like.

In a normal float valve, the amount of fluid that can be discharged is determined by the size of the valve hole area, and the buoyancy of the float necessary for operation depends on the size of the valve hole area and the pressure difference across the valve hole. Although it can be determined, if the same float is used from low pressure to high pressure, a large valve hole area can be obtained at low pressure and a small valve hole can not be avoided at high pressure. It was necessary to align, replace, and replace the valve seat members having the above.

[0003]

2. Description of the Related Art An example of a conventional float valve is disclosed in Japanese Patent Laid-Open No. 5-44894. This is because the float is placed in the valve chamber in a free state and the valve seat member is placed facing the outer surface of the float.
The valve seat member is formed in a spherical shape, and a plurality of valve openings with different opening areas are opened therein.The spherical valve seat member is operated from the outside as the working pressure of the float valve changes from low pressure to high pressure. By rotating to reduce the opening area, the same float can be used from low pressure to high pressure.

[0004]

The above-mentioned float valve requires a spherical valve seat member having a plurality of valve openings having different opening areas for use from low pressure to high pressure, and the spherical valve seat member A member for rotating the valve seat member from the outside is also required, and there is a problem that the structure becomes complicated.

Therefore, a technical object of the present invention is to obtain a float valve having a simple structure which can be opened and closed even if the same float is used from low pressure to high pressure.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above problems form a valve chamber in a valve casing having an inlet and an outlet, and communicate from the valve chamber to the outlet. A valve seat member having a communication hole is attached to a valve casing, a cylindrical valve body is slidably arranged in the communication hole, a through hole is formed in the cylindrical valve body, and one of the through holes is formed. Is opened in the valve chamber and the other is opened in the hole formed in the outlet side valve casing to directly or indirectly attach the float to the valve chamber portion of the tubular valve body, and It is a tubular side part of the body, located in the hole formed in the outlet side valve casing when the float descends, and in a position where it communicates with the outlet when the float rises,
A valve hole communicating with the through hole is provided, and a swirl vane is attached in the through hole.

[0007]

The operation of the above technical means is as follows.
When no liquid is retained in the valve chamber, the float is descending. When the float descends, the valve hole provided in the tubular valve body is located inside the hole formed in the outlet side valve casing, so that the valve hole is closed at the hole and the valve chamber and the outlet are shut off. Therefore, discharge of gas such as steam and air in the valve chamber is prevented. When liquid flows from the inlet into the valve chamber, the float rises due to its buoyancy. The tubular valve body also rises as the float rises, and the valve hole provided in the tubular valve body communicates with the outlet. Therefore, the liquid in the valve chamber is discharged from the through hole opened in the valve chamber of the tubular valve body to the outlet via the valve hole.

The through hole is provided in the tubular valve body, one of which is opened in the valve chamber, and the other of which is opened in the hole formed in the outlet side valve casing. Since the pressure in the valve chamber also acts, the pressure difference between the pressure in the valve chamber and the pressure on the outlet side does not occur in the tubular valve body, so opening and closing operations are performed using the same float from low pressure to high pressure. Can be done.

By mounting the swirl vane in the through hole of the cylindrical valve body, when the float rises and the liquid passes through the through hole and is discharged, the liquid swirls and as a reaction thereof, the cylinder The valve body also turns. By turning the cylindrical valve body,
The eccentric load that acts on the tubular valve body due to the kinetic energy of the liquid when the liquid is discharged constantly changes its direction, preventing the tubular valve body from tilting and allowing smooth vertical movement of the tubular valve body. Maintained.

[0010]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). In this embodiment, an example of a steam trap as a float valve will be described. Entrance 1 and exit 2
Are coaxially arranged, and the main body 3 forming the valve chamber 4 and the lid 5 constitute a steam trap as a float valve. A screen 6 is provided on the main body 3 between the inlet 1 and the valve chamber 4, and a valve seat member 7 is screwed to a lower portion of the screen 6 via a gasket 23. A communication hole 8 that communicates the valve chamber 4 and the outlet 2 is opened in the center of the valve seat member 7, and a long tubular valve body 9 is slidably arranged in the communication hole 8. Therefore, the inner diameter of the communication hole 8 is slightly larger than the outer diameter of the tubular valve body 9.

A through hole 10 is formed inside the cylindrical valve body 9, one of which is opened in the valve chamber 4 through holes 11, 12, and 13 and the other of which is formed in a hole portion 17 provided in the main body 3. It opens through the hole 18 at the lower end. A plurality of swirl vanes 25, 26 that swirl the passing fluid are attached in the through hole 10. The valve chamber 4 of the tubular valve body 9
A hollow spherical float 15 is attached to the inside by welding. The upper end 16 of the tubular valve body 9 is hermetically sealed.

The inner diameter of the hole 17 of the main body 3 is slightly larger than the outer diameter of the tubular valve body 9 so that the tubular valve body 9 can slide. As shown in FIG. 1, when the float 15 is descending, a plurality of valve holes 19 and 20 are provided at positions located inside the holes 17. The valve holes 19 and 20 are provided so as to communicate with the through hole 10 and also communicate with the outlet 2 when the float 15 rises. The size, shape, and number of the valve holes 19 and 20 can be appropriately selected from a circular shape, a rectangular shape, a fan shape, or the like according to the discharge flow rate characteristic of the float valve.

A temperature responsive element 30 made of a bimetal, a bellows, a shape memory alloy or the like is attached to the inside of the valve chamber 4 below the lid 5, and a valve 31 attached to the end of the temperature responsive element 30 is used to form the valve chamber 4 and the outlet 2. The hole 32 that communicates with is opened and closed. The temperature responsive element 30 is capable of contracting to open the hole 32 when the temperature inside the valve chamber 4 is low, and expanding to close the hole 32 at a predetermined high temperature.

Next, the operation will be described. The steam trap connects the inlet 1 to a steam-using device (not shown) and automatically discharges only the condensed water generated in the steam-using device. As shown in FIG. Flows without inflow
When the valve 15 is descending, the valve holes 19 and 20 are the holes 1
Located within 7. When the gap between the inner diameter of the hole portion 17 and the outer diameter of the tubular valve body 9 is sufficiently small, the valve holes 19 and 20 are the hole portion 1.
It is almost shut off by 7 and the steam exits 2
It is not discharged to.

At the start of use of the steam using apparatus, low temperature air in the apparatus also flows into the valve chamber 4, but the temperature responsive element 30 opens so that low temperature air is discharged through the hole 32. It is discharged to the outlet 2.

When the condensate flows into the valve chamber 4 from the inlet 1, the liquid level in the valve chamber 4 rises and the float 15 also rises due to its buoyancy. As the float 15 rises, the tubular valve body 9
When the valve holes 19 and 20 reach the position where the valve holes 19 and 20 communicate with the outlet 2, the condensate in the valve chamber 4 is condensed into the holes 11, 12, 13 and the through hole 1.
It is discharged to the outlet 2 through 0 and the valve holes 19 and 20. When the condensate flows down through the through hole 10, the revolving blades 25 and 26 swirl the condensate, and as a reaction thereof, the cylindrical valve body 9 also swirls.
When the tubular valve body 9 turns, the tubular valve body 9 is prevented from tilting due to the discharge of condensed water, and a smooth vertical movement is maintained. When the condensate is discharged and the liquid level in the valve chamber 4 is lowered, the float 15 is also lowered, the valve holes 19 and 20 are blocked, and the condensate discharge is stopped. This operation is repeated according to the inflow of condensed water.

The hole 17 of the main body 3 includes a hole 18 and a through hole 10.
Is communicated with the valve chamber 4 through the holes 11, 12, and 13, and the pressure in the hole 17 is equal to the pressure in the valve chamber 4. Therefore, when the tubular valve body 9 moves up and down, the valve chamber 4
The differential pressure corresponding to the pressure difference between the internal pressure and the outlet 2 side pressure does not act, and the pressure inside the valve chamber 4, that is, the pressure on the inlet 1 side is almost constant from low pressure to high pressure. It is possible to open and close the valve holes 19 and 20 by the float buoyancy of the.

In this embodiment, an example in which the float 15 is directly attached to the cylindrical valve body 9 is shown. However, the float has a lever-float structure, and the float of the lever is The tubular valve body 9 can be connected to the opposite side portion. Further, in the present embodiment, an example in which nothing is attached to the sliding portion of the tubular valve body 9 is shown, but a sliding ring such as an O-ring is attached,
It is also possible to reduce gas leakage.

[0019]

The present invention produces the following unique effects. With a simple structure consisting of a cylindrical valve body and a float, a pressure difference corresponding to the pressure difference between the inlet side and the outlet side does not occur in the cylindrical valve body, and the same float is used from low pressure to high pressure. -The open / close valve can be operated.

By attaching the swirl vanes, the inclination of the cylindrical valve element is prevented, and the vertical movement of the valve element is made smooth, so that the required buoyancy of the float may be small, and therefore the small shape is required. It is possible to use the float.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a float valve of the present invention.

[Explanation of symbols]

 1 inlet 2 outlet 4 valve chamber 7 valve seat member 8 communication hole 9 cylindrical valve body 10 through hole 15 float 17 hole portion 19,20 valve hole 25,26 swirl vane

Claims (1)

[Claims] 1. A valve seat member having a valve chamber formed in a valve casing having an inlet and an outlet and having a communication hole communicating from the valve chamber to the outlet is attached to the valve casing, and the valve casing is provided in the communication hole. A tubular valve body is slidably arranged, and a through hole is formed in the tubular valve body,
One of the through holes is opened in the valve chamber, and the other is opened on the outlet side.
The float is directly or indirectly attached to the valve chamber portion of the tubular valve body by opening in the hole formed in the sing, and is the tubular side portion of the tubular valve body, When descending, it is located inside the hole formed in the outlet side valve casing and
A float valve, wherein a valve hole communicating with the through hole is provided at a position communicating with the outlet when the valve rises, and a swirl vane is attached in the through hole.