JPS6127638B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bucket-and-float type steam trap in which a downward-facing bucket float is housed freely in a valve chamber, and a valve port is opened and closed directly by a sealing surface provided on the outside of the float.

In this type of trap, there is a risk of tipping over because the float is placed freely inside the valve chamber. The introduction pipe part to be introduced into the float protrudes into the float,
Some protrusions restrict the movement of the float. However, in the above method, the float tends to get caught on the valve chamber wall or protrusion, and this catching delays valve closing and causes steam leakage, and this leaked steam flow upsets the liquid level in the valve chamber and the float. There was a problem in that the float could not close, creating a vicious cycle that further increased steam leakage.

The present invention aims to solve the above problem, and uses a downward bucket float with an introduction hole at the bottom for introducing the inlet fluid into the interior and a small vent hole at the top. The bucket float is housed in a free state in the valve chamber so as to open and close, and the bucket float is formed with a spherical shell of more than a hemisphere with the center of gravity eccentrically downward, and the fluid at the inlet is introduced into the bucket float. , an inlet for introducing the inlet fluid into the valve chamber is formed in the bottom wall of the valve chamber without providing an introduction pipe that protrudes to the inside of the bucket float through the introduction hole;
The introduction hole for the bucket float is located above the inlet.

Explain the action. Since the bucket float has its center of gravity eccentrically downward, the introduction hole is located at the bottom, the small vent hole is located at the top, and the introduction hole is located above the inlet opened in the bottom wall of the valve chamber. Therefore, the inlet fluid flows into the valve chamber from the inlet and flows into the bucket float through the introduction hole. The bucket float rises and falls depending on the amount of steam introduced into the float to open and close the valve port. Since the bucket float is made of a spherical shell with a hemisphere or more, it does not get caught on the valve chamber wall, and since there is no introduction pipe for introducing the inlet fluid into the bucket float, this introduction It won't get caught in the pipe. Therefore, the valve opening can be opened and closed quickly and reliably without causing a delay in valve closing or steam leakage due to binding.

The illustrated embodiment will now be explained. In FIG. 1, a lid 3 is fixed to a main body 1 with bolts 4 via a gasket 2 for airtightness, and a valve chamber 5 is formed inside. The inlet 6 extends through an inlet passage 7 to the bottom wall of the valve chamber 5 and communicates with the valve chamber 5 through an inlet 8 . The valve seat member 9 is screwed onto the upper inner wall of the valve chamber 5 via an airtight gasket 10, and forms a valve port 12 that communicates the valve chamber 5 with the outlet 11. The tip 13 of the valve seat member 9 is formed into a spherical shape so that the float described below can smoothly abut thereon. The float 14 has hemispherical shells 14a with different wall thicknesses,
14b, and its center of gravity is eccentric toward the lower hemispherical shell 14b. A plurality of introduction holes 15 are provided in the lower part of the hemispherical shell 14b side facing the inlet 8, and small air vent holes 16 are provided in the upper part of the hemispherical shell 14a side. Reference numeral 17 denotes a spherical seal portion provided on the outside of the float 14. The float seat 18 is provided on the upper inner wall of the valve chamber 5 and determines the floating position of the float 14.

The operation of this embodiment will be explained. When steam flows into the valve chamber 5 from the inlet 6 through the inlet passage 7 and the inlet 8, this steam flows into the float 14 through the introduction hole 15, so that the float 14 receives buoyancy and moves toward the valve seat member 9 as shown in the figure. and close the valve port 12. When condensate flows into the valve chamber 5 from the inlet 6 as described above, the float 14 loses its buoyancy and sinks (indicated by the two-dot chain line in the figure), leaves the valve seat member 9 and moves toward the valve port 12. open. Since the float 14 is approximately spherical, it does not catch on the inner wall of the valve chamber 5, and its center of gravity is eccentric downward, so the introduction hole 15 is located opposite the inlet 8, and steam is introduced as described above. Therefore, the valve port 12 can be closed by quickly floating up without getting caught. Furthermore, even if fluid flows in from the inflow port 8 with an impact and the float is about to fall due to the impact, the steam inside the float flows out from the introduction hole 15 and the float sinks before it falls, and the fluid that has flown in with this impact is discharged. However, when fluid flows in normally, the eccentricity of the center of gravity automatically returns to the normal posture. Further, the introduction hole 15 is smaller than the valve seat member 9, so that even if the introduction hole portion were to fall to a position where it comes into contact with the valve seat member 9, this valve seat portion 9
I don't get caught up in it. Therefore, the float 14 does not get caught on the inner wall of the valve chamber 5, and the valve opening can be opened and closed quickly and reliably without delay in closing due to catching, and steam leakage can be prevented.

FIG. 2 shows only the float 21 in another embodiment, in which the float 21 is formed with the same wall thickness, and only the lower part where the introduction hole 22 is formed is formed of a thick member 23, so that the center of gravity is eccentrically shifted downward. I'm letting you do it. As shown in FIG. 3, the introduction hole 22 is provided in a substantially hexagonal shape around the center hole, so that a relatively large introduction area can be obtained.

FIG. 4 shows only the float 31 like FIG. 2, and the float 31 has hemispherical shells 31a with different wall thicknesses,
31b, and its center of gravity is eccentric to the lower hemispherical shell 31b. Further, the lower side of the float 31 is formed in a concave shape, and the float 31 is formed in this concave portion 32.
A single large-diameter introduction hole 33 is provided considering that the introduction hole portion will not come into contact with the valve seat member.
Therefore, fluid, particularly steam, introduced into the valve chamber from the inlet is guided by this recess 32, and since the introduction hole 33 is large, it can easily flow into the float 31 through the introduction hole 33.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a bucket-to-float steam trap according to an embodiment of the present invention, FIGS. 2 and 4 are cross-sectional views of only the float of other embodiments, and FIG. 3 is a line A-A in FIG. This is a line cross-sectional view. 1 is the main body, 3 is the lid, 5 is the valve chamber, 6 is the inlet, 8 is the inlet, 9 is the valve seat member, 11 is the outlet, 12 is the valve port, 14, 21, and 31 are the downward buckets. 16 is a small vent hole, and 15, 22, and 33 are introduction holes.

Claims (1)

[Claims] 1. A downward bucket float with an introduction hole at the bottom and a small vent hole at the top for introducing inlet fluid into the interior is housed freely in the valve chamber so that the valve port can be opened and closed directly with its external sealing surface. In what I did,
The bucket float is formed with a spherical shell of more than a hemisphere and the center of gravity is eccentrically downward, and the inlet fluid is introduced into the bucket float without an introduction pipe protruding into the interior through the introduction hole of the bucket float. A bucket-to-float type steam trap in which an inlet for introducing inlet fluid into the valve chamber is formed in the bottom wall of the valve chamber, and a bucket-to-float introduction hole is located above the inlet.