JPS5922388Y2 - Cooling valve seal structure - Google Patents

Description

[Detailed description of the invention] This invention is a cylindrical valve stem to which a flanged cylinder is externally fitted and screwed, and a fluid supply/discharge pipe with a flange at the end of the pipe is integrally held so as to be freely rotatable. The present invention relates to a seal structure for a cooling type valve configured to supply cooling fluid from the fluid supply/discharge pipe to a flow path in the valve stem.

For example, in a butterfly valve, it is necessary to connect the cylindrical rotary valve stem and cooling fluid supply and discharge pipes so that they can rotate freely, and in a slide valve, for example, the cylindrical valve stem can move up and down. For actuated valves, it is preferable to connect the flexible fluid supply and discharge pipes in a suspended state, and for this purpose, the flexible pipes are connected to the upper end of the cylindrical valve stem via a U-shaped steel pipe. In order to connect the U-shaped steel pipe and the flexible pipe at a suitable location above the piping, it is necessary to connect the U-shaped steel pipe and the sliding cylindrical valve rod so that they can rotate freely. be.

As shown in FIG. 4, a joint for this purpose has conventionally been used, in which a fluid supply/discharge pipe 7 having a flange portion 12 is connected to a cylindrical valve stem 3 to which a flanged cylinder 9 is externally screwed. In a cooling type valve configured to be integrally held so as to be relatively rotatable and to supply cooling fluid from the fluid supply/discharge pipe 7 to a flow path in the valve stem 3, an outer circumferential end of the cylindrical valve stem 3 is provided. Means for threading, screwing the threaded member 15 into the threaded portion a in advance, and interposing an annular backing 16 between the cylindrical valve rod 3, the threaded member 15, and the flanged cylinder 9. However, in order to obtain the sealing effect of the backing 16, the flanged cylinder 9 is dimensionally aligned and screwed onto the cylindrical valve stem 3, and then the threaded member 15 is screwed into the annular shape. Backing 1
The threaded member 1 is connected to the end surface of the cylindrical body 9 so that the cylindrical valve rod 3 is deformed and press-contacted with the surface of the threaded portion a of the cylindrical valve rod 3 under moderate pressure.
The dimension between the contact surfaces of 5 must be adjusted manually,
From there, the following problems arose.

(2) If the annular backing 16 is brought into pressure contact with the threaded portion a to achieve sealing performance, the backing 16 will be bitten by the sharp round threads, causing cracks and causing the backing 16 to be easily damaged and possibly leaking.

(2) The backing 16 rotates with the rotation of the threaded member 15 and is destroyed by wear and shear.

■ Damage to the backing 16 due to overtorque of the threaded member 15 that is screwed into the threaded part a and directly presses the backing 16, and failures such as leakage of cooling fluid due to poor sealing effect due to insufficient torque are likely to occur. .

The technical problems to be solved by the present invention are as follows.

■ Seal the backing without touching the thread.

■ When trying to press the backing to obtain a sealing effect, do not allow the pressing tool to rotate.

Prevents overtorque and insufficient torque for O-backing.

The technical measures taken to solve the above-mentioned technical problem include: a cylindrical body portion having an end face opposite to the end face of the valve stem between the facing portion of the flanged cylinder body and the flange portion;
A cylindrical member having a flange-like portion protruding radially outward from the outer periphery of the cylindrical portion is inserted, and an annular shape is inserted between the opposing end surfaces of the cylindrical portion and the valve stem of the cylindrical member. A backing is interposed between the flanged cylinder and the cylindrical member, and the flange portion of the cylindrical member is adjusted in distance relative to the flange of the cylindrical member, and the cylindrical part of the cylindrical member is An adjustment tool for changing the distance between the opposing end surfaces of the flanged cylinder and the valve stem is mounted so as to be operable from the outside of the flanged cylinder.

The technical means works as follows.

After dimensionally matching and screwing the flanged cylinder onto the cylindrical valve stem, the annular backing is inserted from inside the flanged cylinder and brought into contact with the end face of the cylindrical valve stem, and then Insert the shaped part and bring the end surface into contact with the backing.

At this time, set the adjusting tool to a size that acts as a stopper for the movement of the cylindrical member, and screw in and fix the flange part. Next, tighten the adjusting tool until it comes into contact with the flange-shaped part of the cylindrical member. to fix the flanged cylinder and the cylindrical member.

That is, the backing is tightened and fixed by the adjustment tool at a position where the movement of the cylindrical member is stopped by the adjustment tool.

The interference of the backing is therefore ensured according to its physical properties.

Therefore, the following effects are achieved.

■ The backing is interposed between the opposing end faces of the cylindrical part and the valve stem to perform sealing, so the sealing performance is good due to pressure contact with the smooth surface. The backing itself is less likely to crack, and its durability is improved, compared to a seal made by pressure contact.

■ The cylindrical member used as a pressing tool to press the backing for sealing moves in the direction of the cylinder axis without rotating during the pressing operation against the backing, so it is susceptible to damage due to shearing and friction caused by the backing rotating together. does not occur.

■ Since the tightness of the backing is secured according to its physical characteristics, the backing can be tightened with an appropriate torque without over-torque or under-torque with a simple external operation, which prevents damage to the backing. Problems caused by leakage of the cooling fluid can be prevented, and a complete sealing effect can be achieved against leakage of the cooling fluid.

Next, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 1, bearing parts 2, 2 are connected to a valve box 1 equipped with a flange for piping connection, and a cylindrical valve rod 3 is rotatably installed on this bearing part 2 with both ends protruding from the bearing part 2. A fluid pressure cylinder 6 for rotating the valve stem is connected to one of the protrusions via a link 4, and cooling fluid supply and discharge pipes 7, 7 having a joint 6 at the tip thereof are connected to the valve stem. 3 facing in the vertical direction, the lower side pipe 7 is connected to each open end of the valve stem 3 as a cooling fluid supply flow path, and cooling fluid is supplied into the valve stem through the joint 6.6. A valve element 8 is provided on the valve stem 3.
A cooling type butterfly valve that is interposed in the middle of the high temperature fluid flow path is constructed by integrally attaching the valve.

In FIG. 2, a lid 10 is attached to a valve box 1 provided with a flange for piping connection, and a valve body 8' that moves in and out of the valve body flow path is formed in a hollow spiral shape. One valve stem 3 is connected to the helical center and the other valve stem 3 is connected to the helical end to the cylindrical valve stems 3, 3 passing through the bearing part 12.12 of the upper part of the lid, and the cylindrical valve Cooling fluid supply and discharge pipes 7, 7 with joints 6 at the upper ends of the rods 3, 3
are connected to each other to supply cooling fluid to the valve body 8' and the valve stems 3, 3, and a balance weight W for the valve body 8' and a valve body lifting mechanism 13 are provided to provide a cooling system. A slide valve is configured.

In these cooling type valves, the butterfly valve is made up of a connecting pipe 7a and a flexible pipe 7b, and the slide valve is made of a U-shaped steel pipe 7a and a flexible pipe 7b. The joint 6 to be connected is formed by threading the outer peripheral end of the cylindrical valve stem 3, and is fitted into the flanged cylinder body 9 which is externally screwed onto the threaded part a, and which is fitted internally into the cylinder body 9 and is attached to the valve stem 3. The cylindrical member 10 facing the end face of the pipe 7a is attached by the pipe 7a, and an annular backing 11 is interposed between the opposing end faces of the valve stem 3 and the cylindrical member 10.
At the same time, the flange portion 12 is welded to the end of the tube 7a.
A pol) C... is installed over the flange 17 that is loosely fitted, the flange part 9a of the flanged cylinder 9, and the brim part 10a of the cylindrical member 10, and between the flange part 12 and the brim part 10a. An annular backing 14 is interposed in the cylindrical body 9, the cylindrical member 10, and the loose flange 17.
The pipe 7a having the flange portion 12 is connected to the valve stem 3 which is integrally held, so that the pipe 7a has a flange portion 12, so that the pipe 7a is relatively rotatable. Backing 1 between 10a and flange portion 12
By interposing the 1° 14, leakage of the cooling fluid is prevented.

In this embodiment, the amount of pressure applied to the backing 14 can be adjusted by using the pole 1-e in contact with the loose flange 17 and the aforementioned pole C, with the pole 1-e acting as a stopper. The seal effect can be perfected.

[Brief explanation of the drawing]

The drawings in FIGS. 1 to 3 show an embodiment of the seal structure of a cooling type valve according to the present invention, FIG. 1 is a longitudinal side view of a cooling type butterfly valve, and FIG. 2 is a longitudinal side view of a cooling type slide valve. figure,
FIG. 3 is a sectional view of the rotary joint part, and FIG. 4 is a sectional view of the rotary joint part of a conventional structure. 3... Cylindrical valve body, 7... Fluid supply and discharge pipe,
9... Cylindrical body with flanges, 10... Cylindrical member, 11... Annular backing, b...
・Adjustment tool, d...Adjustment tool.

Claims (1)

[Scope of utility model registration request] To the cylindrical valve stem 3 to which the flanged cylinder 9 is externally screwed,
A fluid supply/discharge pipe 7 having a flange portion 12 at the pipe end is integrally held so as to be relatively rotatable, and is configured to supply cooling fluid from the fluid supply/discharge pipe 7 to the flow path within the valve rod 3. In this cooling type valve seal structure, a cylindrical body portion 10b having an end face opposite to an end face of the valve stem 3 is provided between the facing portion of the flanged cylinder body 9 and the flange portion 12; A cylindrical member 10 having a flange-like portion 10a protruding radially outward from the outer peripheral portion of the cylindrical portion 10b is inserted, and the cylindrical portion 10b of this cylindrical member 10 and the valve are inserted. An annular backing 11 is interposed between the end surface facing the rod 3, and
The flanged cylindrical body 9 and the cylindrical member 10 include the cylindrical body 9
The flange portion 1 of the cylindrical member 10 is
0 An adjustment tool for adjusting the distance a to change the distance between the opposing end surfaces of the cylindrical body portion 10b of the cylindrical member 10 and the valve stem 3; The seal structure of the cooled valve allows the device to be operated from anywhere.