JPS6312318Y2 - - Google Patents

Description

[Detailed Description of the Invention] Object of the Invention The present invention relates to a float valve in which a float is accommodated in a free state in a valve chamber, and a valve port is directly closed by the outer surface of the float. This float valve is used as a steam trap or air trap for automatically discharging condensate from a steam piping system or a compression piping system, or as an air vent for automatically discharging air from a water piping system.

Prior Art The following bucket-shaped steam trap was proposed in Japanese Patent Application No. 113219/1983. A cap is fixed to the opening of the broken ball shell to create a downwardly open broken ball shaped float. A valve seat member forming a valve port is attached to the lid. A partially cylindrical float seat coaxial with the valve opening and having a radius slightly larger than that of the float is formed in a line in the axial direction on the lid. When the float floats up and its outer surface comes into contact with the float seat, the spherical center of the float is located on the axis of the valve port, so that the spherical surface of the outer surface can completely close the valve port.

However, in this prior art, since the float seat is a single narrow strip, it tends to swing laterally, making the float unstable to sit on. Therefore, steam may leak.

Japanese Utility Model Publication No. 49-36747 discloses the following air trap. A hollow, sealed spherical float is housed in a free state within the valve chamber. A circular flat float seat is formed on the bottom wall of the valve chamber. When the float descends and its outer surface comes into contact with the float seat,
Although the valve port is closed by the spherical surface of the outer surface, the axis of the valve port and the plane of the float seat are not parallel.

Therefore, in this prior art, if the dimensions of the valve seat member deviate from the design values or if the valve seat member is tightened too much, the float cannot completely close the valve port when it comes into contact with the float seat. . Furthermore, since the float seat is flat, it easily swings back and forth and left and right, making the float unstable to sit on.

Utility Model Publication No. 48-9090 discloses the following air bend. A hollow, sealed spherical float is housed in a free state within the valve chamber. Open the valve port on the side of the valve chamber. An operating rod is placed on the ceiling of the valve chamber, and its lower end is parallel to the axis of the valve port and is formed flat. When the float floats up and its outer surface comes into contact with the lower end surface of the operating rod, the spherical surface of the outer surface closes the valve port.

In this prior art, since the float seat formed on the lower end surface of the operating rod is flat, the float easily swings back and forth and left and right, making the seating unstable.

Technical Issues The technical issues of the present invention are to accommodate a float whose part in contact with the valve opening is spherical in a free state in a valve chamber, open and close the valve opening directly with the outer surface of the float, and automatically pump gas or liquid. To provide a float valve that discharges water to the surrounding area, so that the float is stably seated on a float seat at a position where the valve port is completely closed when the valve is closed.

Composition and action The structure of the float valve of the present invention is as follows.

A valve chamber side of a valve hole that forms a valve chamber in a valve housing, an inlet for introducing gas and liquid into the valve chamber, and an outlet for leading out the liquid or gas in the valve chamber to the outside, and that communicates the valve chamber with the outlet. The valve opening at the end is formed by a valve seat protruding into the valve chamber, and a float whose part in contact with the valve opening is spherical is accommodated in the valve chamber in a free state, and the spherical outer surface of the float is directly attached to the valve seat. A partially cylindrical float seat coaxial with the valve port and having a slightly larger radius than the float is formed in two strips parallel to each other in the axial direction on the inner wall of the valve chamber. The valve port is completely closed when the float touches the float seat.

The invention works as follows. Since the float seating surface is formed into a cylindrical surface parallel to the axis of the valve port, the distance from the float seating surface to the axis of the valve port is constant at all points. Moreover, that distance is almost equal to the radius of the float. Therefore, when the outer surface of the float abuts against the float seat, the axis of the valve port is positioned so as to pass through the spherical center of the float, thereby completely closing the valve port. Since the float seat is formed in two strips in the direction of the axis of the valve port, the float abuts at two points separated from each other and is seated stably without shaking laterally.

Embodiment The bucket and float type steam trap of the embodiment shown in FIG. 1 will be explained in detail. Style 1 and lid 2
and are attached with bolts (not shown) via a gasket 3 for airtightness to form a valve chamber 4. Entrance 5
communicates with the valve chamber 4 through an inlet passage 6 extending to the bottom of the valve chamber 4 and through an introduction pipe 7 screwed onto the bottom wall of the valve chamber 4. The introduction pipe 7 is screwed in the vertical direction, and is surrounded by a substantially spherical bucket float 8 that opens downward.
It is housed and arranged in the valve chamber 4 in a free state. The float 8 consists of a spherical shell piece 9 and an annular base 11 attached to the spherical shell piece 9 so as to form an introduction opening 10. The inlet tube 7 extends through the inlet opening 10 sufficiently into the float 8 so that the float 8 is not inverted. The cap 11 also has the function of a weight to decenter the center of gravity of the float 8 from the spherical center toward the introduction opening 10,
Therefore, the float 8 has the property of floating in the condensate with the introduction opening 10 facing downward. A valve port 14 is formed by a valve seat member 13 that is screwed onto the lid 2 from the inside through a gasket 12 for airtightness. The spherical sealing surface (valve means) 15 of the valve contacts or separates from the valve to close or open the valve. Valve port 14 communicates with outlet 17 through outlet passage 16 . An air vent 18 is provided in the upper part of the float 8. Two protrusions are formed on the inner wall of the lid 2 substantially parallel to the central axis 20 described below, and a float seat 19 is formed there. The float seat 19 is formed into a cylindrical surface whose axis is the central axis 20 of the valve port 14 and whose radius is slightly larger than the radius of the float 8 . As a result, the float seat 19 can be formed coaxially with the mounting hole (threaded hole) of the valve seat member 13 through a series of machining operations, and there is no need to perform chattering and machining separately, making the machining process easy and highly accurate. can. FIG. 2 shows the inner surface of the lid 2, with reference numeral 21 a hole through which a bolt is passed when attaching the lid 2 to the main body 1, and 22 a mounting hole for the valve seat member 13.

Next, the operation of the downward-opening bucket float type steam trap having the above structure will be explained. If steam is applied to the inlet 5 and continues to be supplied into the float 8, sufficient steam will be maintained in the float 8 despite condensation and escape from the vent hole 18, and the float 8 will be able to reach the temperature shown in the figure. As such, it floats in the condensate in the valve chamber 4, and the sealing surface 15 contacts the valve seat and closes the valve port 14. When condensate comes to the inlet 5 after such a state continues, the supply of steam in the float 8 is cut off, and the steam gradually decreases due to condensation and escape from the vent hole 18.
Accordingly, the condensate at the inlet 5 is transferred to the inlet passage 6 and the inlet pipe 7.
and flows into the float 8, thus causing the float 8 to lose its buoyancy. Therefore, the float 8 rotates counterclockwise around the contact point below the valve seat,
The sealing surface 15 separates from the upper part of the valve seat, and the valve port 1
4 will be opened. The float 8 then moves away from the valve seat and sinks, and the valve port 14 is fully opened. After this state continues, when steam comes to the inlet 5 again, the steam passes through the inlet passage 6 and the introduction pipe 7 and accumulates in the float 8, and the float 8 gains buoyancy and rises to the surface, resulting in the state shown in the figure. In this way, the sealing surface 15 comes into contact with the valve seat and closes the valve port 14.

The steam trap of this embodiment operates as described above and automatically discharges only the condensate without discharging the steam, but the cylindrical seal surface 19 is parallel to the central axis 20 of the valve port 14 in the axial direction, and the position of the valve seat surface forming the valve port 14 changes depending on the tightening of the gasket 12 when the valve seat member 13 is screwed onto the lid 2. Even if the float 8 floats up and comes into contact with the float seat 19, it always sits on the valve seat and can completely close the valve port 14. When the valve port 14 is formed to be inclined toward the valve chamber 4 as in this embodiment, the float seat 19 is also inclined as shown in the figure, and even if the float 8 floats away from the valve seat, it remains in this float seat 8. Therefore, it is guided toward the valve seat and can automatically approach the valve seat. The float seat 19 has a cylindrical surface shape slightly larger than the radius of the float 8 in the circumferential direction, and is formed with two stripes parallel to the axis of the valve port 14, so that the floating float 8 has two stripes as shown in FIG. The two locations A and B are held in line contact by the seat 19, and are difficult to move even when the condensate in the valve chamber 4 is shaken, and in particular, the float 8 is kept stable without rolling.

Unique Effects The present invention has the following unique effects. If the float seat is formed in a single line and has a wide width, the float will not be able to completely block the valve port due to dirt being caught between the float seats. In addition, the float becomes difficult to separate from the float seat due to sticky substances such as oil adhering to the float seat and the surface tension of water acting in the narrow gap between the float and the float seat. In the present invention, since there are two float seats, the width of each float seat may be narrow, so the above-mentioned problem does not occur.

Moreover, by arranging the float seats apart from each other, it is possible to reliably prevent the float from rolling when it is seated.

In the present invention, since the float contacts the float seat at two places, the outer surface is less likely to be damaged.

The contact surface of the float seat can be machined coaxially with the mounting hole of the valve seat member. Therefore, it can be formed economically with high precision.

The float seat according to the present invention has a partial cylindrical surface that is coaxial with the valve port and has a slightly larger radius than the float,
Since the two stripes are formed parallel to each other in the axial direction of the valve port, even if the valve seat is worn out and the valve seat surface retreats in the axial direction of the valve port, the float will contact the float seat at the same time. It can always sit on the valve seat and completely close the valve port.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a bucket-and-float type steam trap according to an embodiment of the present invention, FIG. 2 is a bottom view of the lid of FIG. 1, and FIG. 3 is a diagram showing the floating state of the float. 1 is the main body, 2 is the lid, 4 is the valve chamber, 8 is the downward opening bucket float, 9 is the spherical shell piece, 10 is the introduction opening,
12 is a gasket, 13 is a valve seat member, 14 is a valve port, 15 is a spherical sealing surface, 19 is a float seat,
22 is a mounting hole for the valve seat member.

Claims (1)

[Scope of utility model registration request] A valve chamber side end of a valve hole that forms a valve chamber in a valve housing, an inlet for introducing gas and liquid into the valve chamber, and an outlet for leading the liquid or gas in the valve chamber to the outside, and that communicates the valve chamber with the outlet. The valve opening is formed by a valve seat protruding into the valve chamber, and a float whose portion in contact with the valve opening is spherical is accommodated in the valve chamber in a free state, and the spherical outer surface of the float is directly attached to the valve seat. A partially cylindrical float seat coaxial with the valve port and having a slightly larger radius than the float is formed in two strips parallel to each other in the axial direction on the inner wall of the valve chamber. A float valve characterized in that a valve port is completely closed at a position where the valve is in contact with a float seat.