JPH09292035A - High temperature valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seal a fluid surely by separating an annular space formed between an inner cylinder and an outer cylinder into an upstream side and a downstream side, and reduce stress generated on a partitioning structure part so as to extend the life of the partition structure part, in thermal expansion of the diameter direction and the axial direction of the inner and the outer cylinders. SOLUTION: A high temperature valve consists of a valve cage 5 formed in a double structure by an inner cylinder 3 and an outer cylinder 4, and a valve element 6 arranged in the inner cylinder 3. A first partitioning means 11 for partitioning an upstream side and a downstream side is arranged between the inner cylinder 3 and the outer cylinder 4, and it is formed in such a constitution that a first bellows 14 which is expandably and contractibly in the diameter direction A of the inner and outer cylinders 3, 4, and a second bellows 15 which is expandably and contractibly in an axial direction B, are joined with each other through an intermediate ring 16, and they are connected to the outer peripheral side of the inner cylinder 3 and the inner circumferential side of the outer cylinder 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature valve provided in a high temperature double pipe.

[0002]

2. Description of the Related Art Conventionally, as this kind of high temperature valve,
For example, there is a structure shown in FIG. That is, the valve box 51
Is formed in a double structure by the inner cylinder 52 and the outer cylinder 53,
It is connected to a double pipe 56 composed of 54 and an outer pipe 55. Inside the inner cylinder 52 of the valve box 51, a rotatable valve body 57 is provided. The valve body 57 is attached to a valve rod 58 inserted into the outer cylinder 53 and the inner cylinder 52 and is opened and closed. A partition wall 59 for partitioning the upstream side and the downstream side between the outer cylinder 53 and the inner cylinder 52 is formed on the inner peripheral surface of the outer cylinder 53.
The inner peripheral portion and the outer peripheral surface of the inner cylinder 52 are integrally joined by welding.

According to this, the inner pipe 54 of the double pipe 56 and the valve box
The high temperature fluid flows into the inner cylinder 52 of the 51, and this high temperature fluid flows from the joint between the inner cylinder 52 and the inner pipe 54 to the outer cylinder 53 and the inner cylinder.
When leaking to the annular space 60 between the annular space 60 and the annular space 60, or when leaking to the annular space 60 from the seal between the valve rod 58 and the inner cylinder 52, etc., the leaked high-temperature fluid is separated from the partition wall 59 in the annular space 60. Since it is sealed by, the flow of the annular space 60 to the downstream side is prevented.

However, while the inner cylinder 52 thermally expands in the radial direction A due to the heat of the high temperature fluid inside the inner cylinder 52,
Since the outer cylinder 53 remains at a relatively low temperature, it does not expand so much in the radial direction A. As described above, since the difference in thermal expansion between the inner cylinder 52 and the outer cylinder 53 in the radial direction A is generated, excessive thermal stress is generated in the partition wall 59, which causes deformation and distortion.

In order to avoid such a problem, as shown in FIG. 7, there is a high temperature valve having a structure in which the upstream side and the downstream side of the annular space 60 are partitioned by fastening flanges together. That is, a first flange 61 is provided on the outer peripheral surface of the inner cylinder 52, a second flange 62 is provided on the inner peripheral surface of the outer cylinder 53, and a sealing surface of the first flange 61 and a sealing surface of the second flange 62 are provided. A gasket 63 is sandwiched between them, and the first flange 61 and the second flange 62 are fastened with a plurality of bolts 64 and nuts 65.

According to this, since the first flange 61 and the second flange 62 relatively slide in the radial direction A via the gasket 63, the thermal expansion of the inner cylinder 52 and the outer cylinder 53 in the radial direction A. The difference can be absorbed, thus preventing the occurrence of excessive thermal stress.

[0007]

However, in the conventional type shown in FIG. 7, the first flange 61 and the second flange 62 are used.
When and slide relative to each other in the radial direction A repeatedly, the sealing surfaces of the first and second flanges 61 and 62 and the surface of the gasket 63 become scratched and become rough. The high temperature fluid flowing out to the annular space 60 between the first flange 61 and
There is a possibility of leaking from between the seal surface of No. 2 and the seal surface of the second flange 62 and flowing to the downstream side, and the reliability of the seal was low.

On the other hand, in order to increase the reliability of the seal, as shown in FIG. 8, a bellows is used to partition the upstream side and the downstream side between the outer cylinder 53 and the inner cylinder 52. There is a high temperature valve. That is, one bellows is provided at one end of the outer peripheral surface of the inner cylinder 52 and one end of the inner peripheral surface of the outer cylinder 53.
66 is connected, and the other bellows 67 is connected to the other end of the outer peripheral surface of the inner cylinder 52 and the other end of the inner peripheral surface of the outer cylinder 53. Both of these bellows 66, 67 are formed in an annular shape,
It is expandable and contractible in the radial direction A.

According to this, since the bellows 66, 67 expand and contract in the radial direction A, it is possible to absorb the difference in thermal expansion between the inner cylinder 52 and the outer cylinder 53 in the radial direction A, so that the leakage occurs in the annular space 60. The high temperature fluid is securely sealed by the bellows 66 and 67, and the reliability of the seal is improved.

However, when the thermal expansion displacement between the inner cylinder 52 and the outer cylinder 53 occurs in a direction other than the radial direction A, that is, the axial center direction B, the bellows 66 and 67 are deformed by force and the bellows 66 and 67 are deformed.
There is a problem that the life of the bellows 66, 67 is shortened because excessive stress is generated in the bellows. Furthermore, the inner cylinder
The bellows 66 and 67 expand and contract with the vibration of 52 and the vibration from the connected double pipe 56, which causes the bellows 6
There was a problem that 6 and 67 cause fatigue failure in a short period of time.

Therefore, according to the first aspect of the present invention, the thermal expansion in the radial direction and the axial direction between the inner cylinder and the outer cylinder causes leakage into the annular space between the inner cylinder and the outer cylinder. The purpose of the present invention is to reliably seal the fluid in the upstream and downstream directions, reduce the stress generated in the partition structure portion, and extend the life of the partition structure portion. Further, the invention according to claim 4 is intended to prevent the first and second elastic members from expanding and contracting due to the vibration of the inner cylinder and the vibration from the connected pipe.

[0012]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is a valve box formed in a double structure by an inner cylinder and an outer cylinder, and A high temperature valve composed of a valve element provided in an inner cylinder, wherein a first partition means for partitioning an upstream side and a downstream side is provided between the inner cylinder and the outer cylinder. The partitioning means joins a first elastic member that can expand and contract in the radial direction of the inner and outer cylinders and a second elastic member that can expand and contract in the axial direction of the inner and outer cylinders to form an outer peripheral side of the inner cylinder and an inner cylinder of the outer cylinder. It is characterized by being connected to the peripheral side.

According to this, after the valve box is connected to the double pipe consisting of the inner pipe and the outer pipe, the high temperature fluid in the inner pipe of the double pipe comes from the joint between the inner pipe and the inner cylinder of the valve box. When leaking to the annular space between the outer cylinder and the inner cylinder, or leaking from the seal portion between the valve rod and the inner cylinder to the annular space, the leaked high temperature fluid is partitioned by the first partitioning means. , Is prevented from flowing downstream in the annular space. At this time, when the inner cylinder and the outer cylinder respectively thermally expand in the radial direction,
The first elastic member of the first partition means expands and contracts in the radial direction to absorb the difference in thermal expansion between the inner cylinder and the outer cylinder in the radial direction. Further, when the inner cylinder and the outer cylinder respectively thermally expand in the axial direction, the second elastic member of the first partition means expands and contracts in the axial direction, and the thermal expansion difference between the inner cylinder and the outer cylinder in the axial direction. Absorbs. Therefore, the leaked high-temperature fluid can be reliably sealed by the first partitioning means, and the difference in thermal expansion between the inner cylinder and the outer cylinder in the radial direction and the axial center direction can be absorbed. The stress generated in the second elastic member is reduced, and the service lives of the first elastic member and the second elastic member are extended.

Further, the invention according to claim 2 is characterized in that an intermediate ring is interposed at a joint portion between the first elastic member and the second elastic member. According to this, the first
Since the elastic member expands and contracts in the radial direction of the inner and outer cylinders with the intermediate ring as a boundary, and the second elastic member expands and contracts in the axial direction of the inner and outer cylinders with the intermediate ring as a boundary, most of the displacement due to thermal expansion in the radial direction occurs. Is absorbed by the expansion and contraction of the first elastic member, and the second elastic member is not forcibly deformed in the radial direction. Similarly, most of the displacement due to the thermal expansion in the axial direction is absorbed by the expansion and contraction of the second elastic member, and the first elastic member is not forcibly deformed in the axial direction.

Furthermore, the invention according to claim 3 is characterized in that corrugated bellows are used as the first elastic member and the second elastic member, respectively. Further, in the invention according to claim 4, a second partition means for partitioning the upstream side and the downstream side is provided between the inner cylinder and the outer cylinder, and the second partition means is provided on the outer peripheral surface of the inner cylinder. A first flange, a second flange provided on the inner peripheral surface of the outer cylinder, a sealing material sandwiched between the seal surface of the first flange and the seal surface of the second flange, and the first flange and the first flange. It is characterized by comprising a fastener for fastening two flanges.

According to this, the high temperature fluid leaking to the annular space between the outer cylinder and the inner cylinder is partitioned not only by the first partition means but also by the second partition means, so that the sealing property is further improved. Further, by fastening the first flange and the second flange with a fastener in the second partitioning means, the inner cylinder is firmly connected and fixed to the outer cylinder via the first flange and the second flange. Therefore, only the inner cylinder does not vibrate with respect to the outer cylinder.
It is possible to prevent the stretching member from stretching and vibrating.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a high temperature valve interposed in a high temperature double pipe 2, which is provided inside the inner cylinder 3 and a valve box 5 formed in a double structure by an inner cylinder 3 and an outer cylinder 4. And a rotatable valve body 6. The inner cylinder 3 of the valve box 5 is joined to the inner pipe 7 of the double pipe 2, and the outer cylinder 4 is joined to the outer pipe 8. Further, the valve body 6 is
It is attached to the valve rod 9 inserted through the outer cylinder 4 and the inner cylinder 3, and opens and closes the flow path in the inner cylinder 3 by rotating through the valve rod 9.

A first partition means 11 and a second partition means 12 for partitioning the upstream side and the downstream side are provided between the inner cylinder 3 and the outer cylinder 4.
Are provided. The first partition means 11 is a valve box 5
Are installed at the entrance and exit sides of the. Of these, one of the first partitioning means 11 includes a first bellows 14 (an example of a first elastic member) that can expand and contract in the radial direction A of the inner and outer cylinders 3 and 4 and an axial direction B of the inner and outer cylinders 3 and 4. Second bellows that can be freely stretched
15 (an example of a second elastic member) is joined to form an annular shape. The first bellows 14 and the second bellows 15 described above
The cross sections along the radial direction A of and are respectively formed in a corrugated shape in which peaks and valleys are curved.

Of these, the first bellows 14 is the second bellows.
The inner peripheral edge of the first bellows 14 is joined to the inside of the inner cylinder 3
Is welded to the outer peripheral surface of. The outer peripheral edge of the second bellows 15 is welded to the inner peripheral surface of the outer cylinder 4. Furthermore, the first
An intermediate ring 16 having high rigidity is interposed at the joint between the bellows 14 and the second bellows 15. That is, the first
The outer peripheral edge of the bellows 14 and the inner peripheral edge of the second bellows 15 are welded and joined to each other via an intermediate ring 16. The other first partitioning means 11 is also constructed in the same manner as the above-mentioned one first partitioning means 11.

The second partition means 12 is located between the first partition means 11 and the first partition means 11, and is provided on the outer peripheral surface of the inner cylinder 3 along the entire circumference thereof. The second flange 19 provided all around the circumference and the first flange 19
A gasket 20 (an example of a sealing material) sandwiched between the sealing surface of the flange 18 and the sealing surface of the second flange 19;
Plural bolts for fastening the flange 18 and the second flange 19
21 and a nut 22 (an example of a fastener).
A heat insulating material (not shown) is provided in the annular space 23 formed between the outer cylinder 4 and the inner cylinder 3.

The operation of the above configuration will be described below.
The high temperature fluid in the inner pipe 7 of the double pipe 2 is the inner pipe 7 and the valve box 5
When leaking from the joint with the inner cylinder 3 to the annular space 23 in the valve box 5 or from the seal portion between the valve rod 9 and the inner cylinder 3 to the annular space 23, the leaked high temperature fluid is Since it is partitioned by the first partition means 11, it is prevented from flowing through the annular space 23 to the downstream side.

At this time, when the inner cylinder 3 and the outer cylinder 4 are thermally expanded in the radial direction A, the first bellows 14 of the first partition means 11 expands and contracts in the radial direction A and the inner cylinder 3 and the outer cylinder 4 are expanded. And radial direction A
Absorbs the difference in thermal expansion. Furthermore, the inner cylinder 3 and the outer cylinder 4
When and are respectively thermally expanded in the axial direction B, the second bellows 15 of the first partition means 11 expands and contracts in the axial direction B and the inner cylinder 3
The difference in thermal expansion between the outer cylinder 4 and the outer cylinder 4 is absorbed.
Therefore, the leaked high-temperature fluid can be reliably sealed by the first partitioning means 11, and the difference in thermal expansion between the inner cylinder 3 and the outer cylinder 4 in the radial direction A and the axial direction B can be absorbed. The stress generated in the first bellows 14 and the second bellows 15 is reduced, and the life of the first bellows 14 and the second bellows 15 is extended.

At this time, the first bellows 14 expands and contracts in the radial direction A with the intermediate ring 16 as a boundary, and the second bellows 15 expands and contracts in the axial direction B with the intermediate ring 16 as a boundary. Most of the displacement due to the thermal expansion is absorbed by the expansion and contraction of the first bellows 14, and the second bellows 15 is not forcibly deformed in the radial direction A. Similarly, most of the displacement due to the thermal expansion in the axial direction B is absorbed by the expansion and contraction of the second bellows 15, and the first bellows 14 is not deformed in the axial direction B by force.

Further, since the high temperature fluid flowing out of the inner cylinder 3 is partitioned not only by the first partition means 11 but also by the second partition means 12, the sealing property is further improved. Also, the second
In the partition means 12, the first flange 18 and the second flange
The inner cylinder 3 is fastened to the outer cylinder 4 via the first flange 18 and the second flange 19 by fastening the bolts 21 and the nuts 22 to each other.
It is firmly connected and fixed to. Therefore, only the inner cylinder 3 does not vibrate with respect to the outer cylinder 4, and therefore, the first bellows 14 and the second bellows 15 can be prevented from expanding and contracting, and the first bellows 14 and the second bellows 15 can be prevented. It is possible to prevent fatigue fracture with.

Next, in the second embodiment of the present invention, as shown in FIG. 3, in the cross section along the radial direction A of the first bellows 14, the peaks and the valleys have an acute angle. It is formed in a sharp wave shape. Here, the cross section along the radial direction A of the second bellows 15 is formed in a corrugated shape in which the peaks and valleys are curved, but like the first bellows 14, the peaks and valleys are formed. May be formed in a wave shape that is sharply sharpened.

In the first and second embodiments, the first bellows 14 which is expandable and contractible in the radial direction A is attached to the inner cylinder 3, and the second bellows which is expandable and contractible in the axial direction B is attached to the outer cylinder 4. 15
Although the second bellows 15 is attached to the inner cylinder 3,
The first bellows 14 may be attached to the outer cylinder 4.

Next, in the third embodiment of the present invention, as shown in FIG. 4, as another example of the first elastic member,
The first ring body 31 that can expand and contract in the radial direction A is used, and
As another example of the elastic member, a second elastic member that can expand and contract in the axial direction B is used.
A ring body 32 is used. Each of the first ring body 31 and the second ring body 32 has a cross section of C along the radial direction A.
It is formed in a shape. The first ring body 31 and the second ring body 32 are joined via the intermediate ring 16.

In the third embodiment, the inner cylinder 3 is attached with the first ring member 31 which is expandable and contractible in the radial direction A, and the outer cylinder 4 is attached.
The second ring body 32 is attached to the inner cylinder 3 so as to be expandable and contractible in the axial direction B.
The ring body 31 may be attached.

Next, a fourth embodiment of the present invention will be described with reference to FIG. That is, a ring-shaped inner mounting member 37 is externally fitted to the end portion of the inner cylinder 3 to form a plurality of bolts 38 and nuts.
By 39, it is connected and fixed to the surface of the first flange 18 opposite to the sealing surface. At the tip of this inner mounting member 37,
A first bellows 40, which is expandable and contractible in the radial direction A, is provided. The cross section of the first bellows 40 along the radial direction A is formed in a V shape.

An annular outer mounting member 41 is fitted to the end of the outer cylinder 4 and is fixedly connected by a plurality of screws 42. A second bellows 43 that is expandable and contractable in the axial direction B is provided on the inner peripheral surface of the outer mounting member 41. The cross section of the second bellows 43 along the radial direction A is U-shaped. The first bellows 40 and the second bellows 43 are joined via the intermediate ring 16.

In the fourth embodiment, the first mounting bellows 40, which is expandable and contractible in the radial direction A, is attached to the inner mounting member 37, and the second mounting bellows 43, which is expandable and contractible in the axial direction B, is attached to the outer mounting member 41. However, the second bellows 43 may be attached to the inner attaching member 37 and the first bellows 40 may be attached to the outer attaching member 41.

[0032]

As described above, according to the invention described in claim 1 of the present invention, the leaking high temperature fluid can be reliably sealed by the first partitioning means, and the inner cylinder and the outer cylinder are further separated from each other. Since the difference in thermal expansion between the radial direction and the axial direction can be absorbed, the stress generated in the first elastic member and the second elastic member is reduced, and the life of the first elastic member and the second elastic member is extended. .

Further, according to the second aspect of the invention, the first elastic member expands and contracts in the radial direction of the inner and outer cylinders with the intermediate ring as a boundary, and the second elastic member has the axial center of the inner and outer cylinders with the intermediate ring as a boundary. Since the elastic member expands and contracts in the direction, most of the displacement due to the thermal expansion in the radial direction is absorbed by the expansion and contraction of the first elastic member, and the second elastic member is not deformed by force in the radial direction. Similarly,
Most of the displacement due to the thermal expansion in the axial direction is absorbed by the expansion and contraction of the second elastic member, and the first elastic member is not forcibly deformed in the axial direction.

Further, according to the invention as set forth in claim 4, since the high temperature fluid leaking into the annular space between the outer cylinder and the inner cylinder is partitioned by the second partition means in addition to the first partition means, the sealing performance is improved. Further improve. Further, by fastening the first flange and the second flange with a fastener in the second partitioning means, the inner cylinder is firmly connected and fixed to the outer cylinder via the first flange and the second flange. Therefore, only the inner cylinder does not vibrate with respect to the outer cylinder. Therefore, it is possible to prevent the first elastic member and the second elastic member from expanding and contracting and vibrating the first and second elastic members in a short time. It can be prevented from occurring in the meantime.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a high temperature valve according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of first and second partitioning means of the high temperature valve.

FIG. 3 is an enlarged cross-sectional view of first and second partitioning means of a high temperature valve according to a second embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of first and second partitioning means of a high temperature valve according to a third embodiment of the present invention.

FIG. 5 is an enlarged cross-sectional view of first and second partitioning means of a high temperature valve according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional high temperature valve that uses a partition wall as a partition means.

FIG. 7 is a cross-sectional view of a main part of a conventional high temperature valve, which uses a flange as a partitioning means.

FIG. 8 is a cross-sectional view of a conventional high temperature valve that uses a bellows as a partitioning means.

[Explanation of symbols]

 1 high temperature valve 3 inner cylinder 4 outer cylinder 5 valve box 6 valve body 11 first partition means 12 second partition means 14 first bellows (first elastic member) 15 second bellows (second elastic member) 16 intermediate ring 18 First flange 19 Second flange 20 Gasket (seal material) 21 Bolt (fastener) 22 Nut (fastener) 31 First ring body (first elastic member) 32 Second ring body (second elastic member) 40 First Bellows (first elastic member) 43 Second bellows (second elastic member) A radial direction B axial direction

Claims (4)

[Claims] 1. A high temperature valve comprising a valve box having a double structure composed of an inner cylinder and an outer cylinder, and a valve body provided in the inner cylinder, wherein the inner cylinder and the outer cylinder are provided. A first partition means for partitioning the upstream side and the downstream side is provided between the cylinder and the cylinder, and the first partition means is a first expandable / contractible member in the radial direction of the inner and outer cylinders.
A valve for high temperature, characterized in that an elastic member and a second elastic member which is elastic in the axial direction of the inner and outer cylinders are joined and connected to the outer peripheral side of the inner cylinder and the inner peripheral side of the outer cylinder. . 2. An intermediate ring is interposed at a joint between the first elastic member and the second elastic member.
High temperature valve described. 3. The high temperature valve according to claim 1, wherein corrugated bellows are used as the first elastic member and the second elastic member, respectively. 4. A second partition means for partitioning the upstream side and the downstream side is provided between the inner cylinder and the outer cylinder, and the second partition means is a first flange provided on the outer peripheral surface of the inner cylinder. And a second flange provided on the inner peripheral surface of the outer cylinder, a sealing material sandwiched between the sealing surface of the first flange and the sealing surface of the second flange, and the first flange and the second flange. 4. The high temperature valve according to claim 1, wherein the high temperature valve is formed of a fastener.