JPH0331919Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention utilizes the difference in specific gravity between gas and liquid to directly open and close the valve opening with a sealed hollow float, and automatically removes condensate generated in the steam piping system. The present invention relates to a free-floating steam trap for discharging water, and particularly to a mounting structure for a valve seat member forming a valve port.

In a free-float type steam trap, a sealed hollow float placed freely inside the valve chamber floats up and down along with the liquid level inside the valve chamber, and its outer surface directly opens and closes the valve opening formed in the valve seat member. Only water is automatically discharged. A float seat is provided at the bottom of the valve casing so that the float closes the valve port of the valve seat member at the lowest position, and the intersection of the extension axis from the float seat and the extension axis of the central axis of the valve port is the ball of the float. Designed to match your heart.

However, the valve seat member is subject to significant wear due to the impact force caused by the float's seating and separation, and the large valve closing force due to steam pressure, and the valve seat member and casing are eroded by condensate passing through the valve port at high speed. There's a problem.

BACKGROUND ART Therefore, conventionally, as shown in Japanese Utility Model Publication No. 50-254, a valve seat member is formed separately from a valve casing, and a valve hole formed in the axial direction from the valve port and an outlet are connected to each other. A through hole that communicates with a communicating discharge passage is located in the direction of the discharge passage, and is attached to the valve casing via a sealing means such as an O-ring, and a valve seat holding member provided with a recess is screwed into the valve casing. The convex portion was fitted into the concave portion of the valve seat holding member to hold the valve seat. Since the valve seat member is formed and attached separately from the valve casing, even if it becomes worn or eroded, it can be replaced by removing the valve seat holding member. Further, since the through hole of the valve seat member is formed so as to be located in the direction of the discharge passage, the inner wall of the valve casing is not eroded by discharged condensate.

Problem to be solved by this invention In this case, the valve seat member is tilted, and the intersection of the extension axis from the float seat that determines the lowering position of the float and the extension axis of the central axis of the valve port coincides with the spherical center of the float. Therefore, there is a problem in that the float cannot close the valve port of the valve seat member, resulting in steam leakage.

In other words, there is a gap between the valve seat member and the valve seat holding member so that the valve seat member does not rotate when the valve seat holding member is screwed in, and the valve seat member is displaced by fluid pressure and the valve seat member The concave and convex portions are loosely connected so that the convex portion fits into the concave portion of the valve seat holding member, so the convex portion fits into the concave portion of the valve seat holding member while the valve seat member remains tilted and displaced. This is to fit together.

The technical problem of this invention is to prevent the valve seat member from tilting so that the intersection of the extension axis from the float seat, which determines the lowering position of the float, and the extension axis of the central axis of the valve port always coincides with the spherical center of the float. It is to do so.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems are as follows: The valve seat member is formed separately from the valve casing, and the through hole is formed in the valve seat member. is positioned in the direction of the discharge passage and attached to the valve casing via a sealing means such as an O-ring, the valve seat holding member provided with the recess is screwed into the valve casing, and the protrusion provided on the valve seat member is inserted into the valve seat holding member. In the device that is fitted and held in a recessed portion, a tapered portion is formed on the convex portion of the valve seat member, and the tapered portion is fitted into the recessed portion of the valve seat holding member.

Effect The operation of the above technical means is as follows.

There is a gap between the valve seat member and the valve seat holding member as in the conventional case, and the valve seat member does not rotate when the valve seat holding member is screwed in. When the valve seat member is displaced in response to fluid pressure and its convex portion fits into the concave portion of the valve seat holding member, the tapered portion formed on the convex portion of the valve seat member comes into contact with the concave portion of the valve seat holding member. Fit together. Therefore, even if the valve seat member is displaced in an inclined state, a part of the tapered part of the convex part of the valve seat member hits the recessed part of the valve seat holding member and is further displaced, so that the tapered part is completely fitted. They slide and fit together until the point where they meet, that is, the intersection of the axis of extension from the float seat and the axis of extension of the center axis of the valve port, matches the spherical center of the float.

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

The valve seat member is displaced so that the intersection of the extended axis of the central shaft and the extended axis of the float seat coincides with the spherical center of the float, so the float can reliably close the valve port and maintain its initial performance for a long time. can do.

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

A valve casing is formed by fixing a lid 2 to a main body 1 with bolts 3, and a condensate reservoir chamber 4 is formed inside. Reference number 5 is an annular gasket. An inlet 6 is opened in the upper part of the condensate reservoir chamber 4, and the inlet 6 communicates with the condensate reservoir chamber 4 through a cylindrical screen 7. An outlet 8 is provided on the same axis as the inlet 6. The outflow port 8 communicates with the lower part of the condensate reservoir chamber 4 through a valve seat member insertion port 9 and a discharge passage 10.

A hollow spherical float 11 is housed in a free state in a condensate reservoir chamber 4. A float cover 12 for holding a float 11 is attached to the upper part of the condensate reservoir chamber 4. A float seat 13 is formed at the lower part of the condensate reservoir chamber 4. A retaining plate 16 is fixed to an annular wall 14 formed on the inner surface of the lid 2 via a snap spring 15, and a bimetal chamber 17 is formed inside the bimetal plate 1.
Place 8. The bimetal plate 18 opens and closes the exhaust passage 19 communicating the condensate reservoir chamber 4 and the outlet 8 in response to temperature changes.

Insert the valve seat member 21 into the valve seat member insertion opening 9 until it hits the stopper portion 20. Valve seat member 21
is substantially cylindrical, and has a valve port 22 formed at the end of the condensate reservoir chamber 4, a valve hole 23, and a through hole 24 positioned toward the discharge passage 10 in the axial direction. An O-ring 25 is arranged around the outer periphery of the valve seat member 21 to maintain airtightness with the valve seat insertion port 9. A convex portion 2 is provided at the end opening of the valve hole 23.
A blind stopper 27 provided with a hole 6 is press-fitted. A tapered portion 28 is formed in the convex portion 26 of the blind stopper 27. Valve seat insertion port 9
A valve seat holding member 29 is screwed to the opening of the main body 1 provided with a gasket to close the opening. A recess 30 is provided in the valve seat holding member 29.

When the valve seat holding member 29 is screwed together, the valve seat member 21 is inserted to a position where it hits the stopper portion 20, and even when the valve seat member 21 is screwed in, there is a gap between the two members and the valve seat member 21 does not rotate. When in use, the valve seat member 21 retreats due to fluid pressure, and the blind plug 27
The convex portion 26 fits into the concave portion 30 of the valve seat holding member 29. At this time, the convex portion 26 has a tapered portion 28
, so even if it is displaced in a tilted state,
The tapered portion 28 fits into the recessed portion 30 while sliding.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a free-floating steam trap according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the valve seat member portion of FIG. 1. 1: Main body, 2: Lid, 4: Condensate storage chamber, 6: Inlet, 8: Outlet, 10: Discharge passage, 11: Float, 13: Float seat, 21: Valve seat member, 22:
Valve port, 24: Through hole, 25: O ring, 26: Convex portion, 28: Tapered portion, 29: Valve seat holding member, 3
0: recess.

Claims (1)

[Scope of utility model registration request] A valve seat in which a valve seat member is formed separately from a valve casing, a through hole formed in the valve seat member is positioned in the direction of the discharge passage, and is attached to the valve casing via a sealing means such as an O-ring, and a recessed portion is provided. In the case where the holding member is screwed into the valve casing and the convex part provided on the valve seat member is fitted into the concave part of the valve seat holding member and held, a tapered part is formed on the convex part of the valve seat member, and the tapered part is A free-floating steam trap that fits into the recess of the valve seat holding member.