JPS6330556B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bucket-and-float type steam trap in which a valve hole is directly opened and closed by a downward-opening bucket float accommodated in a free state within a valve chamber.

In conventional bucket and float type steam traps, for example, as shown in Japanese Utility Model Publication No. 13619/1983, a drain valve is connected to the bucket and float via a valley or a link mechanism. Therefore, the service life was shortened due to wear of the connecting parts and hinges. In addition, as shown in Registered Utility Model Publication No. 368907, there are bucket floats with a drain valve directly attached to them, but since a member is provided to guide the drain valve to the valve hole, the opening/closing valve is During this process, the drain valve came into sliding contact with the guide member, which caused it to easily wear out and shorten its lifespan.

Conventional Technology Therefore, the technology disclosed in Japanese Utility Model Publication No. 53-32364 has been used in the past. The valve housing forms an inlet passage, a valve chamber, and an outlet passage, and a valve seat member with a valve hole that communicates the valve chamber and the outlet passage is arranged to protrude above the valve chamber. A downward-opening bucket float, which has an introduction opening for introducing fluid into the interior at the bottom and a small vent hole at the top, is housed freely in the valve chamber so that the valve hole can be opened and closed directly with its external sealing surface. A bucket float is formed from a hemispherical shell piece and a cylindrical mouthpiece fixed to its circular opening, and a vertical introduction hole for introducing fluid from the inlet passage into the valve chamber is opened at one location in the center of the bottom of the valve chamber. This is what I did.

The bucket float can be freely displaced within the valve chamber.
Since the entire external sealing surface becomes the sealing surface of the valve seat member, it has excellent wear resistance.

Problems to be Solved by the Invention In this case, since the bucket float is disposed in a free state within the valve chamber, it is likely to sway during ascent and descent.
In other words, when the bucket float opens the valve hole, there is a pressure difference between the inlet passage and the valve chamber, and the fluid in the inlet passage impulsively flows into the valve chamber from the single introduction hole and flows into the bucket float. Because of the collision,
A cap is attached to the bottom of the bucket float to eccentrically shift the center of gravity downward, but it is not possible to completely prevent the bucket float from shaking. Therefore, since the introduction opening of the bucket float moves up and down while sliding against the inner wall of the valve chamber, there is a problem in that displacement resistance is large and valve closing is delayed, causing steam leakage.

Means for Solving the Problems The technical means of the present invention taken to solve the above problems is a valve that forms an inlet passage, a valve chamber, and an outlet passage in a valve casing, and communicates the valve chamber and the outlet passage. A valve seat member with a hole is arranged so as to protrude above the valve chamber,
A downward-opening bucket float with an introduction opening at the bottom and a small vent hole at the top for introducing fluid from the inlet passage into the interior is placed in a free state inside the valve chamber so that the valve hole can be opened and closed directly with its external sealing surface. In the valve chamber, the bucket float is formed from a spherical shell of more than a hemisphere and a cap fixed to the circular opening, and a vertical introduction hole for introducing fluid from the inlet passage into the valve chamber is installed at the bottom of the valve chamber. A plurality of them were arranged at approximately equal intervals on a circumference slightly smaller than the introduction opening of the bucket float.
It is something.

Effects The effects of the above technical means are as follows.
Multiple introduction holes are arranged at approximately equal intervals on a circumference that is slightly smaller than the introduction opening of the bucket float, so the impact force of the inflowing fluid from the inlet passage is dispersed, reducing the oscillation of the bucket float. be able to. In addition, even if the bucket float is shaken and about to fall, that is, even if the introduction opening of the bucket float is tilted from the horizontal line, the inflowing fluid will collide with the downwardly displaced part of the bucket float, and the upper It flows into the inside of the bucket float without colliding with the displaced part. Therefore, the force of the fluid that collides with the downwardly displaced portion increases to push up that portion, so that the introduction opening of the bucket float can be returned to a horizontal position. Therefore, the bucket float can quickly move up and down without being displaced up and down while sliding against the inner wall of the valve chamber, and there is no possibility of delay in valve closing and steam leakage.

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

As in Registered Utility Model Publication No. 368907, if an introduction pipe is provided that protrudes into the interior of the bucket float through the introduction opening, and a plurality of horizontal introduction holes are arranged at approximately equal intervals at the tip of the introduction pipe, it is possible to The impact force of the inflowing fluid can be dispersed. However, if the bucket float is formed of a spherical shell with a hemisphere or more, even if the bucket float starts to tip over, the fluid from the introduction hole will hit the inner surface of the bucket float evenly, making it difficult to return the introduction opening to a horizontal position. I can't. Therefore, the introduction opening of the bucket float gets caught on the introduction pipe and cannot be quickly displaced up and down. In contrast, in the present invention, a plurality of introduction holes are arranged vertically on the bottom wall of the valve chamber at approximately equal intervals on one circumference, which is slightly smaller than the introduction opening of the bucket float. The introduction opening can be returned to a horizontal position. Furthermore, since there is no introduction pipe provided, there is no chance of getting caught in the introduction pipe.

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

A lid 3 is fixed to the main body 1 via a gasket 2 for airtightness with appropriate tightening means such as bolts, forming a valve housing having a valve chamber 4 therein. The inlet passage 5 extends from the side to the bottom of the valve housing and communicates with the valve chamber 4 through an introduction hole 7 of an introduction member 6 screwed onto the bottom wall of the valve chamber 4 . As shown in FIG. 2, the introduction hole 7 of the introduction member 6 is arranged in the valve chamber so that the fluid from the inlet passage 5 flows into the valve chamber 4 toward the introduction opening of the float described below, and is introduced into the float from the introduction opening. They are provided at the bottom of 4, facing the introduction opening, and arranged at approximately equal intervals on one circumference. The valve seat member 9 is screwed onto the upper part of the valve chamber 4 via an airtight gasket 10, and forms a valve hole 8 that communicates the valve chamber 4 with an outlet passage 11. Valve hole 8
An erosion prevention member 12 made of an erosion-resistant material is fitted on the inner wall of the outlet passage 11 facing downstream to prevent erosion by the discharge flow. The downward-opening bucket float 13 has a substantially spherical shell portion 14 having a spherical crown shape with its lower part cut out along one plane, and is joined to the cut portion of the shell portion 14 to form an introduction opening 15, and has its center of gravity on the side of the introduction opening. Offset and shell portion 14
It consists of an annular cap 16 that prevents deformation of the cap 16, and is disposed in a free state within the valve chamber 4. Also, the shell part 14
A spherical seal portion 17 is formed on the outside to abut against the valve seat member 9, and a small vent hole 18 is provided in the upper portion to vent steam, etc. in the float 13 to the valve chamber 4. Reference numeral 19 denotes a float floating seat with which the outer surface of the float 13 comes into contact when floating.

The operation of the above embodiment will be explained. When gas such as steam is introduced from the inlet passage 5 through the introduction hole 7 into the float 13 through the introduction opening 15, the float 13
obtains buoyancy and floats up as shown in the figure, seats on the valve seat member 9, and closes the valve hole 8 with its seal portion 17. When condensate is introduced from the inlet passage 5 through the introduction hole 7 into the float 13 through the introduction opening 15, the float 13
The buoyant force decreases and the valve sinks, leaving the valve seat member 9 and opening the valve hole 8.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a bucket-to-float type steam trap according to an embodiment of the present invention, and FIG. 2 is a plan view of the introducing member shown in FIG. 1. 1: Main body, 3: Lid, 4: Valve chamber, 5: Inlet passage,
6: Introduction member, 7: Introduction hole, 8: Valve hole, 9: Valve seat member, 11: Outlet passage, 13: Downward opening float, 15: Introduction opening, 16: Mouthpiece, 17: Seal portion.

Claims (1)

[Claims] 1 An inlet passage, a valve chamber, and an outlet passage are formed in the valve casing, and a valve seat member with a valve hole that communicates the valve chamber and the outlet passage is arranged to protrude above the valve chamber, and the fluid in the inlet passage is A downward-opening bucket float with an introduction opening at the bottom and a small vent hole at the top is housed freely in the valve chamber so that the valve hole can be opened and closed directly with its external sealing surface. In the
A bucket float is formed from a spherical shell of more than a hemisphere and a cap fixed to the circular opening of the shell, and a vertical introduction hole for introducing the fluid from the inlet passage into the valve chamber is provided at the bottom of the valve chamber, and from the introduction opening of the bucket float. A bucket-to-float type steam trap, with multiple bucket and float type steam traps arranged at approximately equal intervals on a slightly smaller circumference.