JPH0527746Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention provides a sealing material that supplies a sealing material to a valve body and a metal seat on the valve body side, between the metal seat on the valve body side and the metal seat on the valve body side. An injection hole is provided, an annular groove communicating with the sealing material injection hole is formed in the valve box side metal sheet, and a soft seal ring that presses against the valve body side metal sheet is fitted into the valve box side metal sheet. The present invention relates to a seal structure for a certain valve.

[Conventional technology]

Conventionally, in the above-mentioned valve seal structure, as shown in FIG. are formed separately at a distance in the diametrical direction of the seal ring 9, and the valve box side metal sheet 9 and the valve body side metal sheet 11 are formed on both sides of the seal ring 15 in the radial direction so as not to contact each other. Ta.

[The problem that the idea aims to solve]

In the case of this conventional seal structure, regardless of the surface accuracy and waviness of the valve body side metal seat 11,
Since the soft seal ring 15 fitted on the valve body side metal seat 9 can always be brought into pressure contact with the valve body side metal seat 11, the valve body side metal seat 9
Although it is possible to seal between the two metal sheets 9 and 11 while facilitating the processing of the valve body side metal seat 11, the gap S between the valve body side metal sheet 9 and the valve body side metal seat 11
It is easy for foreign substances such as sand, welding slag, and rust to enter the flow path.

In addition, since foreign matter is likely to get caught in the gap S when the valve is opened and closed, these foreign matter may cause the seal ring 15 to
As a result, not only the sealing performance of the seal ring 15 deteriorates in a short period of time, but also the annular groove 14 is easily damaged from the sealing material injection hole 13.
Even if a sealing material such as grease is injected between the metal sheets 9 and 11 through the seal ring 15, it may be difficult to restore the desired sealing performance of the seal ring 15. In this case, the deep annular groove 14 contained foreign matter, which caused the inconvenience that the sealing material could not be wrapped around the entire circumference.

Furthermore, since the holding hole 9b for the seal ring and the sealing material injection hole 13 are formed separately in the valve box side metal sheet 9, the number of processing steps for the valve box side metal sheet 9 increases, and the manufacturing cost is reduced. I had a problem with the price getting higher.

If we were only concerned with solving this inconvenience, we could form the contact surface of the seal ring with the metal seat on the valve body side flush with the metal seat on the valve body side. This has the fatal disadvantage of impairing the sealing function of the seal, and in the end, the structure of the conventional example described above was adopted.

An object of the present invention is to provide a seal structure that can improve the sealing performance between the valve body side metal seat and the valve body side metal seat while facilitating processing.

[Means to solve the problem]

The technical means of the present invention taken to achieve the above object is that a sealing material injection hole is provided in the valve body and the metal seat on the valve body side to supply sealing material between the metal seat on the valve body side and the metal seat on the valve body side. an annular groove communicating with the sealing material injection hole is formed in the metal sheet on the valve body side, and a soft seal ring that presses against the metal sheet on the valve body side is fitted into the metal sheet on the valve body side. In the valve seal structure,
The discharge port side portion of the sealing material injection hole is formed to pass through the seal ring, and the groove width in the metal sheet radial direction of the annular groove formed in the valve box side metal seat is set to the groove of the seal ring. The seal ring is formed to be larger than the width of the annular groove and is disposed so as to fit within the groove width of the annular groove, and the seal ring is provided between the valve box side metal seat and the valve body side metal seat. The annular grooves are formed so as to be in surface contact with each other at both sides in the radial direction.

[Effect]

The effects of taking the above technical measures are as follows.

a When the valve is closed, the metal seat on the valve body side and the metal seat on the valve body side are brought into surface contact on both sides of the seal ring, but since the seal ring is located within the groove width of the annular groove, the seal ring Even if it is arranged so that it slightly protrudes from the contact surface of the metal seat on the valve body side in the free state so that it comes into pressure contact with the metal seat on the valve body side, it will fall within the groove width as it comes into contact with the metal seat on the valve body side. It undergoes bulk elastic deformation. In other words, even though the seal ring is pressed against the metal seat on the valve body side at a predetermined pressure,
Both metal sheets can be configured to make surface contact with each other.

b. Since the discharge port side portion of the seal material injection hole is formed through the seal ring, the seal material is applied to both the inner and outer sides in the radial direction from the discharge port position.
A sealing function is performed at each position of the contact surface between the seal ring and the valve body side metal seat, and the contact surface between the valve body side metal seat and the valve body side metal seat.

c The metal seat on the valve box side and the metal seat on the valve body side are placed in surface contact on both the inside and outside sides of the annular groove, so the annular groove is
Even if the sealing material is extremely shallow and has a smooth shape with no major changes to the metal sheet surface, it is possible for the sealing material to go around in the circumferential direction, thereby preventing foreign objects from entering the annular groove. Even if it is possible, it is relatively easy to discharge when opening the valve.

d The annular groove of the metal seat on the valve box side is divided into two parts, the inner and outer sides, due to the presence of the seal ring that fits within the width of the annular groove. Even if the foreign object gets caught, there is a low possibility that both the inner and outer annular groove portions will be blocked, and there is little possibility that the sealing material will be hindered from passing around due to the foreign object getting caught.

[Effect of idea]

The effects of taking the above technical measures are as follows.

B. From the actions described in a to d above, the contact surface between the metal seat on the valve body side and the metal seat on the valve body side is affected by the pressure contact of the seal ring against the metal seat and the surface contact between the metal sheets located on both the inner and outer sides of the metal seat. , it is possible to seal with a three-stage sealing action, to suppress damage to the soft seal ring due to the intrusion of foreign matter, and to supply sealant between both metal sheets from the sealant injection hole at any time. In combination with this, it is possible to reliably and effectively seal the two metal sheets over a long period of time.

B. From the effects of a and b above, a seal ring is inserted into the seal material injection hole, and the through hole formed in this seal ring constitutes the discharge port side portion of the seal material injection port. In comparison, the number of hole machining steps for the metal sheet on the valve box side is reduced, making machining easier and reducing manufacturing costs at the same time.

〔Example〕

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

As shown in FIG. 3, a valve body 2B is formed by welding valve body parts 2A, 2A provided with connection parts for various fluid transport pipes 1, 1, and a valve body 2B. A pair of valve rods 4A, 4B are integrally connected to a cylindrical valve body 3 having an inner diameter approximately equal to the path diameter in a state perpendicular to the axis of the flow path 3a of the valve body 3, and both valve rods 4A, 4B are connected together.
is rotatably supported in the valve box main body 2B, and one valve stem 4A extends through the valve box main body 2B, and the valve stem 4 protrudes from the valve box main body 2B.
A valve opening/closing mechanism 6 equipped with a manual operation handle 5 is interlocked and connected to the valve box portions 2A, 2A.
A seal structure A is provided between the valve body 3 and the valve body 3.
A ball valve is configured to open and close the flow path within the valve box.

As shown in FIGS. 1 and 2, to configure the seal structure A, an annular valve body side metal sheet 9 is provided inside the valve body portion 2A so as to be freely threadable in the direction of distance from and near the valve body 3. In addition to screwing, the seat surface 9a of the valve box side metal sheet 9 is formed into a partially spherical shape.

On the other hand, a circular flat plate portion 11B having a relatively small wall thickness and having an approximately equal thickness throughout, and a circular flat plate portion 11B having an approximately equal thickness over the entire portion and a seat surface 9a of the valve box side metal sheet 9. The opposing partially spherical sheet portions 11A are connected to the flat plate portion 11B.
The valve body side metal sheet 11 is integrally molded in a continuous manner over the entire circumference of the valve body 3, and this valve body side metal sheet 11 is brought into contact with a cylindrical support portion 3b integrally extending from the valve body 3. It is attached to the center of the valve body 3.

A connection port 1 for a sealing material supply pipe 12 that opens on the outer surface side of the valve box portion 2A is provided in a portion of the valve box portion 2A that fits and holds the valve box side metal sheet 9.
3a, a first annular groove 13b opening on the inner surface side of the valve body portion 2A, and both 13a, 13
A plurality of L-shaped second flow paths 13d are formed in the valve box side metal sheet 9, and a plurality of L-shaped second flow paths 13d are formed in the valve box side metal sheet 9. A second channel that is connected to the second flow path 13d and opened to the seat surface 9a side.
An annular groove 13c is formed, and the connection port 1
3a, first flow path 13c, first annular groove 13b, second
A sealing material injection hole 13 for supplying a sealing material between the valve box side metal sheet 9 and the valve body side metal sheet 11 is formed by the flow path 13d and the second annular groove 13e.

An extremely shallow (approximately 0.2 mm) smooth annular groove 14 for storing the sealant that communicates with the second annular groove 13e of the sealant injection hole 13 is recessed in the valve box side metal sheet 9. A seal ring 15 made of soft resin such as PTFE, which is pressed against the seat surface 11a of the valve body side metal seat 11, is press-fitted (or fitted) into the two annular grooves 13e from the perspective of the valve body side metal seat 11, and,
The sealing material injection hole 1 has through holes 15a formed at a plurality of locations in the circumferential direction of the seal ring 15.
The discharge port side portion of No. 3 is configured.

Further, the valve box side metal seat 9 and the valve box side metal seat 11 are formed so as to be in surface contact with each other on both sides of the seal ring 15 in the radial direction.

The tip sliding surface of the seal ring 15 with respect to the valve body side metal seat 11 is formed into a partially spherical shape, and the spherical tip sliding surface has a sealing material reservoir that communicates with the through hole 15a formed in the seal ring 15. An annular groove 15b is formed for this purpose.

The seal ring 15 is made to protrude slightly (approximately 0.2 mm) toward the valve body side metal seat 11 from the seat surface 9a of the valve body side metal seat 9.

When the valve is closed, the soft seal ring 15 fitted on the valve body side metal seat 9 is pressed against the valve body side metal seat 11, and the valve body side metal Since the seat 9 and the valve body side metal seat 11 are in surface contact with each other and a sealing material film is formed between the two contact surfaces, the sealing action at these three locations seals the gap between the metal sheets 9 and 11. Can be reliably sealed. Moreover, the valve body side metal seats 9 on both sides of the seal ring 15 in the radial direction
Due to the surface contact between the valve body side metal seat 11 and the valve body side metal seat 11, it is possible to prevent foreign matter present in the flow path from entering the seal ring 15 side through the gap between the two metal sheets 9 and 11, and from being bitten. .

In addition, 16 in the figure is an O-ring fitted into an annular groove formed on the outer circumferential surface of the metal sheet 9 on the valve box side.

Further, in the above embodiments, the seal structure of a ball valve was described, but the technology of the present invention may be applied to the seal structure of other valves such as a butterfly valve or a gate valve.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the valve seal structure according to the present invention, and FIG. 1 is a cross-sectional view of the seal part,
FIG. 2 is an enlarged sectional view of the main parts, and FIG. 3 is a partially cutaway front view of the entire ball valve. FIG. 4 is a sectional view showing a conventional valve seal structure. 2... Valve box, 9... Valve box side metal sheet, 11
... Valve body side metal seat, 13 ... Seal material injection hole, 14 ... Annular groove, 15 ... Seal ring.

Claims (1)

[Claims for Utility Model Registration] A sealing material injection hole 13 is provided in the valve box 2 and the valve box side metal seat 9 to supply a sealing material between the valve box side metal seat 9 and the valve body side metal seat 11. An annular groove 1 communicating with this sealing material injection hole 13
4 is a valve seal structure in which a soft seal ring 15 is formed on the valve box side metal sheet 9 and is fitted into the valve body side metal sheet 9, which presses against the valve body side metal sheet 11. The discharge port side portion of the sealing material injection hole 13 is formed to pass through the seal ring 15, and the groove width in the metal sheet radial direction of the annular groove 14 formed in the valve box side metal seat 9 is set as described above. The seal ring 15 is formed to be larger than the groove width of the seal ring 15 and disposed so as to fit within the groove width of the annular groove 14, and the valve box side metal sheet 9 and the valve body side metal sheet 11 and are formed so as to be in surface contact with each other at both radial positions of the annular groove 14 in which the seal ring 15 is provided.