JP2514713Y2 - Butterfly valve for hot gas pipeline - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve used in a high temperature gas pipeline connected to a gas turbine or a blast furnace.

[0002]

2. Description of the Related Art Conventionally, a butterfly valve for high temperature gas has been
In order to prevent loss of retained heat of the gas passing through the valve, and to prevent the valve box itself from being deformed or corroded due to high heat, the inner peripheral wall is lined with a heat insulating material that forms a flow path. As shown in FIGS. 4 and 5, the state is the inner peripheral wall 11a of the valve box 1a.
A semicircular arcuate valve box valve seat 31a is fixed in a central portion of the valve avoiding a portion through which the valve shaft 2a is inserted, and a heat insulating material 4a is lined on both sides of the valve box valve seat to form a flow path 6a. The structure is used.

[0003]

By the way, in the case of this prior art, the semicircular arched valve box valve seat 31a is fixed by avoiding the portion where the valve shaft 2a is inserted into the central portion of the inner peripheral wall 11a of the valve box. Therefore, when the valve shaft is inserted, the valve box valve seat is interrupted, and when the valve is closed and the differential pressure between the upstream side and the downstream side of the valve becomes large, this interrupted portion forms a kind of passage S. Form. That is, the passage S communicates with the gap at the joint between the valve box inner peripheral wall 11a existing on the upstream side and the downstream side of the valve box valve seat 31a and the heat insulating material 4a, and the gap inside the heat insulating material, and the high temperature gas communicates with them. Leakage occurs inside the valve through the gap.
Moreover, as the leak continues, it is pushed by the fluid pressure and the above-mentioned gap gradually expands and the leak amount increases, and the valve box itself is heated to a high temperature and becomes a dangerous state. There is a problem in that there is a risk that a crack will occur and the fracture will fall off.

In addition, in other types of valves for hot gas
Regarding gas leakage, some conventional technologies have already been proposed,
For example, in Japanese Patent Laid-Open No. 61-278664 shown in FIG.
In this case, the valve body 3b rotatably fitted in the valve box 1b
With the valve shaft 2b and the support shaft 101 provided above and below it,
It is composed of Ramix in one body and rotates this valve body 3b.
Ceramic ring formed so as to support rotatably
Having a pair of support members 102 in the shape of
From both sides in the valve box, the first heat-resistant member 103, 103a and
And the second heat resistant members 104 and 104a are inserted and joined.
The configuration is shown. However, this conventional technique is the tuyeres of a blast furnace.
It is installed in a pipe that blows high-temperature and high-pressure air (hot air) to
It is a flow control valve, and of course the amount of gas passing through the valve.
Since the mission is to control the
However, at least a slight amount of gas leakage
There is no need to consider the danger of being fatal
That is. Therefore, from the upstream side and the downstream side of the valve,
Support a valve body that is integrally molded by inserting a heat resistant member
Inevitably gaps between layers when adopting the configuration
(P, Q, R, T, U, V in the figure) is a problem
There can be no severe restrictions on which gas leaks,
The condition is completely different from the elephant valve for the hot gas pipeline. In order to solve the above-mentioned problems, the present invention provides a high temperature gas pipe.
To be impregnated with heat-insulating material in the valve body as a valve of the road
Therefore , even if a gap is inevitably formed between the layers , high-temperature gas leaks between the upstream side and the downstream side in the valve box , and as a result , troubles that reduce or damage the valve function are reliably prevented. The purpose is to provide a butterfly valve for a pipeline.

[0005]

SUMMARY OF THE INVENTION A butterfly valve according to the present invention is a valve in which a heat insulating material 4 for forming a flow path is lined on an inner peripheral wall.
A valve shaft 2 having a valve body 3 fixed to a box 1 is rotatably supported by a height.
A butterfly valve for a hot gas line, which is a valve box bearing symmetrical from the center of the inner peripheral wall 11 of the cylindrical valve box 1 toward the outside
12 protruding from each other and fixed to the valve box bearing 12 in the valve.
By connecting the bearing portion 33 and the bearing portion 33 to each other,
The inner wall 11 and the entire circumference are fixed without interruption.
A valve box seat 31 composed of a ring 34 is integrally formed with the valve box 1.
The valve box bearing portion 12 and the bearing portion 32 in common.
By the two valve shafts 2 inserted from both sides into the shaft hole 32
Rotatably pivotally supports the valve body 3 fitted in the ring 34.
The valve box valve seat 31 allows communication between the upstream side and the downstream side.
With the bearing 33 and the ring 34 completely shut off,
The above-mentioned problem was solved by lining the heat insulating material 4 adhered to both side surfaces and the entire inner peripheral wall 11 of the valve box and coating the surface of the heat insulating material 4 with the heat resistant metal plate 5.

[0006]

It has a bearing portion of the two positions for inserting the valve shaft to the inner circumferential wall central portion of the action the valve box, form connect the bearing portion by the ring
The formed valve box valve seat is disconnected from the valve box bearing and the inner wall of the valve box.
Is it fixed and configured integrally with the valve box?
Since there is no interruption at the valve shaft insertion point, and the entire inner peripheral wall is covered with the heat insulating material that adheres to both sides, the valve box inner wall and the heat insulating material existing upstream and downstream of the valve box valve seat. gets rid communication inevitably gap being formed in the junction of the gaps or insulation material itself and, to leak in the valve to the downstream side gas from the upstream side
There is no possibility that Into this integrated valve
In order to attach and support the valve body, the structure of the valve body itself
Conditions are imposed, and the valve body is first inserted into the ring surface of the valve box seat surface.
It is fitted inside, and the two valve shafts are separately loaded into the valve body from the outside of the valve box.
The method of locking with a pin or the like is a prerequisite.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical sectional front view of an embodiment of the present invention, FIG. 2 is a vertical sectional side view, and FIG. 3 is a perspective view showing a mounting state of a valve box and a valve box valve seat of the same embodiment. . In each figure,
Symmetrically outward from the center of the cylindrical valve box 1
A valve box in which the bearing portion 12 projects and is fixed to the valve box bearing portion 12.
A shaft hole 32 formed in common with the bearing portion 33 of the valve seat 31
The two valve shafts 2 are separately inserted from the outside of the valve box and rotatable.
The disc-shaped valve element 3 is fixed to the valve shaft 2 by a pin 35. A valve box valve seat 31 is fixed to the center of the inner peripheral wall 11 of the valve box at right angles to the flow path 6, and a ring 34 with which the valve body 3 is in close contact with the entire circumference when the valve is closed.
And the bearing part 33 connected by this ring.
It Valve box bearing 12 and valve box valve seat bearing 33, inside valve box
Fix the peripheral wall 11 and the ring 34 of the box box valve seat, respectively.
The method does not need to be particularly limited, and can be a conventional technique known in the art.
It is enough, but most commonly the welding method is preferred.
One, fixing all around, means spot welding
It means excluding partial welding such as.

The heat insulating material 4 is lined over the entire circumference of the inner wall 11 of the valve box while sandwiching the valve box valve seat 31 from the upstream side and the downstream side. That is, the heat insulating material is also in close contact with the bearing portion 33 and filled with no space. Further, the inner peripheral wall of the heat insulating material 4 is covered with a heat resistant metal plate 5 to directly cut the contact between the high temperature gas in the flow path and the heat insulating material. In the figure, a packing 21 and a packing retainer 2 are provided on the valve box penetrating portion of the valve shaft 2.
2 keeps the valve box airtight.

[0009]

[Effects of the Invention] As described above, the present invention is
A small amount of gas leaks inside the valve by being installed in the high temperature and high pressure gas pipeline.
Butterfly valve that is exposed to severe operating conditions that are not allowed
scheduled. Since it is for high temperature and high pressure gas, of course
When attaching a lining material that protects the main body from the gas body
The basic form is, but under the basic restrictions
Focusing on the proposition of how to extinguish gas leaks
It was Upstream and downstream joining portion and the valve box internal wall 11 and the heat insulating material in the assembly of the valve in the heat insulating material inside the layers of the valve casing valve seat
Sometimes it is inevitable that a slight gap will occur
However, this gap should communicate across the upstream and downstream sides.
The effect of surely preventing the leak and preventing leakage inside the valve is remarkable.
is there. For this reason, there is no problem that the outer skin of the valve box body is heated to a high temperature and falls into a dangerous state, or the heat insulating material is cracked and the heat insulating material is destroyed and falls out of the valve. It was Further, since the inner peripheral wall of the heat insulating material is protected by the heat resistant metal plate, there is an effect that the surface of the heat insulating material can be prevented from being damaged or washed away by the contact with the high speed fluid when the valve is opened.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention.

FIG. 2 is a vertical side view of the same embodiment.

FIG. 3 is a partial perspective view showing a mounted state of a valve box and a valve box valve seat of the same embodiment.

FIG. 4 is a vertical sectional front view of a conventional technique.

FIG. 5 is a vertical side view of the same prior art.

[Figure 6] Partial cross-sectional front view (A) of another prior art and part
It is a side view (B) of a cross section.

[Explanation of symbols]

1 valve box 2 valve shaft 3 valve body 4 heat insulating material 5 heat resistant metal plate 6 flow path 11 inner peripheral wall 12 valve box bearing portion 31 valve box valve seat 32 shaft hole 33 bearing portion 34 ring

Claims (1)

(57) [Scope of utility model registration request] 1. A the hot gas pipe road butterfly valve insulation 4 valve shaft 2 with a fixed valve body 3 in the valve body 1 lined with axially supported rotatably to a flow path wall, a cylindrical symmetrically from a central portion shaped for <br/> valve box 1 of the inner circumferential wall 11 outward
The valve box bearing 12 is projected and fixed to the valve box bearing 12 in the valve.
Two bearing parts 33 and the bearing parts 33 are connected to each other.
With the valve box, the inner wall 11 and the entire circumference are fixed without interruption.
The valve box valve seat 31 composed of the ring 34 that is fixed is integrated with the valve box 1.
Formed in common, and is common to the valve box bearing portion 12 and the bearing portion 32
Valve shafts that are inserted from both sides into the shaft hole 32 that has been drilled
The valve body 3 fitted in the ring 34 is rotated by
Is rotatably supported at the upstream side and the downstream side by the valve box valve seat 31.
With the bearing portion 33 and the ring portion completely disconnected from the communication.
A butterfly for a high-temperature gas pipeline, characterized in that the heat insulating material 4 adhered to both side surfaces of the valve 34 and the entire inner peripheral wall 11 of the valve box is lined, and the surface of the heat insulating material 4 is covered with a heat resistant metal plate 5. valve.