JPH0743555Y2 - Valve body structure of high temperature slide valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a valve body structure of a high temperature slide valve used for controlling a flow rate of a fluid chemical catalyst or the like.

2. Description of the Related Art Conventionally, in a petroleum refining facility or the like, a high temperature slide valve has been used in the middle of a flow path through which a high temperature fluid containing powder particles is circulated like a fluid chemical catalyst. Conventional high-temperature slide valves have a valve body that moves in and out in a direction orthogonal to the flow direction of the high-temperature fluid, and in order to ensure wear resistance to the fluid, the inner surface of the valve box and the valve body The outer peripheral surface of the was coated with wear resistant lining.

However, since the fluid flows in the direction along the surface of the valve body at the tip portion of the valve body, the wear of the upstream flat surface and the tip surface at the tip portion of the valve body becomes severe, There is a problem that the control accuracy for the fluid is impaired in a short period of time. In particular, when a high temperature fluid such as a fluid type chemical catalyst is used as the fluid, wear is severe, but strict control accuracy is required, so that there has been a problem that frequent maintenance is required. For this reason, it is possible to attach a ceramic plate that has excellent wear resistance even at high temperatures to the valve body, but the ceramic plate is fragile due to its characteristics and has a small coefficient of thermal expansion, while the metal material that serves as a strength member has a coefficient of thermal expansion. However, there is a problem that the ceramic plate is damaged due to the difference in thermal expansion between the two. That is, in the hot state, a gap is generated between the ceramic plates, and the powder or granules flowing into the gap impedes the contraction of the metal material in the cold state, so that stress acts on the ceramic plate and the ceramic plate is damaged. There was a problem.

The present invention solves the above problems, and an object of the present invention is to provide a valve body structure of a high temperature slide valve capable of preventing damage to a ceramic plate due to thermal expansion and contraction.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a valve body of a high temperature slide valve for controlling a high temperature controlled fluid including powder particles, and a plurality of metal substrates of the valve body are provided on the valve body. Insert the protrusions formed on the back side of the ceramic plates adjacent to each other into the holes formed in the metal substrate, and engage the flanges formed at the tips of the protrusions to remove the ceramic plates. A metal holding member for stopping is fixedly provided on the inner peripheral surface of the hole, and the side surfaces of the adjacent ceramic plates facing each other are formed into parallel inclined surfaces, and
A suitable gap is formed between both side surfaces, and the side surface of the adjacent ceramic plate is located above the side surface of the other ceramic plate. The distance is made longer than the distance between the flange of the protrusion of the other ceramic plate and the surface of the metal substrate.

Action With the above-described configuration, the surface of the valve element is secured by the ceramic plate against wear of the controlled fluid. And
In the hot state in which the controlled fluid flows, the adjacent ceramic plates relatively approach in the vertical direction due to the thermal expansion of the metal substrate in the thickness direction, and the gap is reduced. In other words, the thermal expansion of the metal substrate in the thickness direction causes the protrusion of the ceramic plate to move in accordance with the amount of thermal expansion of the metal substrate that is between the flange of the ceramic plate and the surface of the metal substrate. The brim is moved away from the surface of the metal substrate. At this time, the distance between the flange portion and the surface of the metal substrate in the protrusion of one ceramic plate of which the side surface is located above the side surface of the other ceramic plate of the adjacent ceramic plates is the protrusion of the other ceramic plate. Since it is formed longer than the distance between the flange portion and the surface of the metal substrate in one part, due to the difference in thermal expansion of the metal substrate depending on the difference between the two, the flange portion of one ceramic plate located above the other Farther away from the surface of the metal substrate than the flange of the ceramic plate of
Both ceramic plates are relatively close to each other in the vertical direction, and the gap is reduced.

On the other hand, the metal substrate also thermally expands in the direction along the surface, so that the distance between the adjacent ceramic plates increases in accordance with the distance between the adjacent holes and the difference in the coefficient of thermal expansion between the ceramics and the metal. Therefore, it is possible to control the reduction amount and the enlargement amount to the same amount by setting the size of each part according to the difference in thermal expansion.

Therefore, even if the granular material in the controlled fluid flows into the gap between the ceramic plates in the hot state, the gap between the ceramic plates does not change even in the cold state. Damage to the board is prevented.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
In the figure, the controlled fluid 1 is a high-temperature fluid containing powder particles, and the valve box 2 forms a flow path for the controlled fluid 1. Further, a valve seat 3 is formed inside the valve box 2, and the valve seat 3
The valve body 4 that opens and closes the flow path (port) formed in 1 is located downstream of the valve seat 3. The valve body 4 is located on both sides of the valve body 4 and is slidably supported on both sides by guides 5 provided on the valve box 2. The valve body 4 is guided by the guides 5 and flows through the valve seat 3. The flow rate of the controlled fluid 1 is controlled by moving back and forth in the direction traversing the path. A seat ring 6 that seals between the valve seat 3 and the valve body 4 is fixed to the valve seat 3 with a bolt, and the seat ring 6 is in sliding contact with the valve body 4. An opening for inserting the valve body 4 is formed in the valve box 2, and a valve box cover 7 for closing the opening is fixed to the valve box 2 with bolts. Further, a seal band 8 is interposed between the valve box lid 7 and the valve box 2,
The seal band 8 seals the gap between the valve box lid 7 and the valve box 2. A valve rod 9 penetrating the valve box lid 7 and inserted into the valve box 2 is connected to the base end of the valve body 4, and the valve rod 9 is slidably supported by the valve box lid 7. Has been done. The gap between the valve rod 9 and the valve box lid 7 is sealed by a bush 10 and a gland packing 11. Further, a hexagonal mesh-shaped hex steel 12 made of stainless steel is welded and fixed to the inner surface of the valve box 2, and the mesh of the hex steel 12 is filled with a wear-resistant lining material 13.

As shown in FIGS. 2 to 3, the tip of the valve body 4 is covered with a plurality of wear-resistant ceramic plates 14, and the ceramic plate 14 is made of silicon nitride or the like. . In addition, hex steel 12 is welded and fixed to a part of the front surface of the valve body 4 which is not covered by the ceramic plate 14 and the front surface and the front surface of the downstream surface.
The mesh is filled with a wear-resistant lining material 13. Each ceramic plate 14 is fixed to a base plate 15 made of heat-resistant metal that is welded and fixed to the valve body 4. The mounting structure will be described below in detail.

The ceramic plates 14 are arranged adjacent to each other on the surface of the base plate 15 at a distance of L.
The projecting portion 16 formed on the back surface of the is inserted into the hole portion 17 provided in the base plate 15. A flange portion 18 is formed at the tip of the protruding portion 16, and the metal holding member is in the form of a half tube that engages with the flange portion 18 and prevents the ceramic plate 14 from coming off.
19 is welded and fixed to the inner peripheral surface of the hole 17. The metal holding member 19 may be screwed to the base plate 15.

The adjacent ceramic plates 14a, 14b are formed with parallel side surfaces 20a, 20b facing each other, and an appropriate gap D is formed between the side surfaces 20a, 20b. Further, of the adjacent ceramic plates 14a and 14b, the side surface 20a is located above the side surface 20b of the other ceramic plate 14b, and the distance A between the flange portion 18 and the surface of the base plate 15 of the protrusion 16 of the one ceramic plate 14a. Is the other ceramic plate 14
It is formed to be longer than the distance B between the flange portion 18 and the surface of the base plate 15 in the protruding portion 16 of b. In addition, the distance A, B, D, L
And the inclination angles Θ of the side surfaces 20a, 20b are determined in consideration of the thermal expansion coefficients of the ceramic plate 14 and the base plate 15.

The operation of the above configuration will be described below. Valve rod 9
By this operation, the valve element 4 moves back and forth, the flow path in the valve seat 3 is expanded and contracted, and the flow rate of the controlled fluid 1 is controlled. At this time, the flow of the controlled fluid 1 inside the valve box 2 becomes a flow along the surface of the valve body 4 in the vicinity of the valve body 4. For this reason, the powder or granular material contained in the controlled fluid 1 is rubbed against the surface of the valve body 4 and the surface of the valve body 4 is worn, and especially the tip end portion of the valve body 4 has a strong wear action. However, the ceramic plate 14 ensures the wear resistance of the tip end portion of the valve body 4 against the controlled fluid 1. Therefore, the wear of the tip end portion of the valve body 4 is suppressed to prolong the life of the valve body 4 and the controlled body 1 is controlled. The control accuracy for the fluid 1 is maintained for a long period of time.

Even if a difference in thermal expansion occurs between the ceramic plates 14a, 14b and the base plate 15 when used at high temperatures, the ceramic plates
The gap D between 14a and 14b hardly changes, and the controlled fluid 1 does not flow through the ceramic plate 14 when not in use.
It is equal to the gap D between a and 14b. That is, the base plate 1
The thermal expansion of 5 in the thickness direction causes the ceramic plate 14
The flange portion 18 of the protrusion 16 of the ceramic plates 14a and 14b moves away from the surface C of the base plate 15 in accordance with the amount of thermal expansion of the base plate 15 that is between the flange portion 18 of a and 14b and the surface C of the base plate 15. .

At this time, when the surface C of the base plate 15 is used as a reference position, the collar portion 18 of the protrusion 16 of the one ceramic plate 14a is formed.
Since the distance A between the surface C of the base plate 15 and the surface C of the base plate 15 is longer than the distance B between the flange 18 of the protrusion 16 of the other ceramic plate 14b and the surface C of the base plate 15,
Due to the difference in thermal expansion of the base plate 15 according to the distance difference AB between the two, the flange portion 18 of the one ceramic plate 14a located above is higher than the flange portion 18 of the other ceramic plate 14b from the surface C of the base plate 15. The ceramic plates 14a and 14b are spaced further apart from each other, and the ceramic plates 14a and 14b are relatively close to each other in the vertical direction, and the gap D is reduced. On the other hand, on the other hand, the base plate 15 also thermally expands in the direction along the surface, so that the adjacent ceramic plates 14a, 14b of the adjacent holes 17 depending on the axial distance of the adjacent holes 17 and the difference in the coefficient of thermal expansion of the metal. The distance L between them increases. Since the reduction amount and the expansion amount can be controlled by determining the dimensions of each part according to the difference in thermal expansion, the dimensions of each part are determined so that the reduction amount and the expansion amount are the same.

Therefore, even if the granular material in the controlled fluid flows into the gap D between the ceramic plates 14a and 14b in the hot state, the gap D between the ceramic plates 14a and 14b remains in the cold state. Since the value is substantially equal to the value in the hot state, it is possible to prevent the ceramic plates 14a and 14b from being damaged by the heat contraction of the base plate 15.

As described above, according to the present invention, the side faces of the adjacent ceramic plates are formed into inclined surfaces, and one side face of the adjacent ceramic plates is located above the side face of the other ceramic plate. By forming the flange portion on the protrusion of the ceramic plate and the surface of the metal substrate to be longer than the distance between the flange portion on the protrusion of the other ceramic plate and the surface of the metal substrate The flange of one ceramic plate is farther away from the surface of the metal substrate than the flange of the other ceramic plate, and both ceramic plates are relatively close to each other in the vertical direction to change the gap due to the difference in thermal expansion. Even if the granular material in the controlled fluid flows into the gap between the ceramic plates in the hot state, the gap between the ceramic plates in the cold state can be equalized. Therefore, the ceramic plate can be prevented from being damaged due to heat shrinkage of the metal substrate.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention, FIG. 2 is an overall perspective view of a valve body of the same embodiment, and FIG. 3 is a conceptual view showing a mounting structure of a ceramic plate on a base plate. 1 ... Controlled fluid, 2 ... Valve box, 3 ... Valve seat, 4 ... Valve body, 12 ...
Hexsteel, 13 ... Lining material, 14 ... Ceramic plate,
15 ... Base plate, 16 ... Projection, 18 ... Collar, 20a, 20b
… Sloping surface.

Claims (1)

[Scope of utility model registration request] 1. A valve body of a high temperature slide valve for controlling a high temperature controlled fluid containing a granular material, wherein a plurality of ceramic plates are formed on a metal substrate of the valve body adjacent to each other and on the back surface thereof. The metal holding member, which is inserted into the hole provided on the metal substrate and arranged, is engaged with the flange formed at the tip of the protrusion to prevent the ceramic plate from coming off. The adjacent ceramic plates are fixed to each other, and the opposite side surfaces of the adjacent ceramic plates are formed into parallel inclined surfaces, and an appropriate gap is formed between the both side surfaces. Of the protrusion of one ceramic plate located above the side surface of the metal plate is longer than the distance between the flange of the protrusion of the other ceramic plate and the surface of the metal substrate. Valve structure of high temperature slide valve.