JPH0425677A - Valve structure of high temperature slide valve - Google Patents

Abstract

PURPOSE:To push power and granule material in a controlled fluid taken in a clearance in a hot state, into a groove aprt in a cost state and shunting it away, thereby preventing any damage to a ceramic plate from occurring, by installing the groove part at the back of the ceramic plate. CONSTITUTION:The tip part of a valve element 4 is covered with plural ceramic plates 14 with abrasion resistance each, and a securing pin 16 clamping each ceramic plate 14 is inserted into a through hole 17 for arrangement, and its head part 16a is engaged with a spot facing part 18 of this through hole 17 and the ceramic plate 14 is engaged thereat, while its leg part 16b is welded to a base plate 15. An annular groove part 19 is formed at the back of the ceramic plate 14 being opposed to the base plate 15. With this constitution, a thermal expansion difference being produced in space between the ceramic plate 14, the base palte 15 and the securing pin 16 at time of application at high temperature is absrobed by each clearance between the ceramic plates themselves as well as between the ceramic plate 14 and the base plate 15, and at time of disuse, the clearance formed between the ceramic plates 14 is eliminated by contraction of the base plate 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a valve body structure of a high-temperature slide valve used to control the flow rate of a fluidized chemical catalyst or the like.

2. Description of the Related Art Conventionally, in petroleum refineries and the like, high-temperature slide valves have been used in the middle of flow paths through which high-temperature fluids containing powder or granules, such as fluidized chemical catalysts, flow. Conventional high-temperature slide valves have a valve body that moves in and out in a direction perpendicular to the flow direction of high-temperature fluid. A wear-resistant lining was applied to the outer circumferential surface.

Problems to be Solved by the Invention However, since the fluid flows in the direction along the surface of the valve body at the tip of the valve body, the upstream plane and the tip surface of the tip of the valve body are subject to severe wear. There was a problem that the control accuracy for the fluid was lost in a short period of time. Particularly when handling high-temperature fluids such as fluidized chemical catalysts, they suffer from severe abrasion and require strict control accuracy, which necessitates frequent maintenance. For this reason, it may be possible to attach a ceramic plate, which has excellent wear resistance even at high temperatures, to the valve body, but due to its characteristics, ceramic plates are brittle and have a small coefficient of thermal expansion, whereas metal materials, which serve as strength members, have a coefficient of thermal expansion. Since the difference in thermal expansion between the two is large, there is a problem in that the ceramic plate is damaged due to the difference in thermal expansion between the two. In other words, in the hot state, gaps are created between the ceramic plates and between the ceramic plate and the metal material, and the powder particles that flow into the gaps are compressed when the metal material contracts in the cold state, and stress is applied to the ceramic plate. However, there was a problem that the ceramic plate was damaged.

The present invention solves the above problems, and aims to provide a valve body structure of a high-temperature slide valve used for controlling high-temperature fluid containing powder and granules.

Means for Solving the Problems In order to solve the above problems, the present invention provides a valve body that controls a high-temperature controlled fluid containing powder and granules, in which a plurality of ceramic plates are provided to cover the surface of a metal substrate. A metal fixing pin is placed through the ceramic plate, and the head part locks the ceramic plate, and the foot part is welded and fixed to the metal board, and the pin is attached to the back side of the ceramic board facing the metal board. It has a structure in which a groove is formed.

Effect: With the above-described configuration, the surface of the valve body is provided with abrasion resistance against the controlled fluid by the ceramic plate. and,
Since the ceramic plates have a smaller coefficient of thermal expansion than the metal base of the valve body, in hot conditions where the controlled fluid flows, the thermal expansion of the metal base of the valve body and the metal fixing pin causes the gap between each ceramic plate and the ceramic A gap is formed between the plates and the metal substrate, and in a cold state where the controlled fluid does not flow, the gap between each ceramic plate and between the ceramic plate and the metal substrate is eliminated by contraction of the metal substrate of the valve body. Ru. At this time, the particles in the controlled fluid that flow into the gaps formed in the hot state are pushed into the grooves of each ceramic plate and evacuated when the gaps are eliminated in the cold state. movement of the ceramic plate is not obstructed and damage to the ceramic plate is prevented.

EXAMPLE An example of the present invention will be described below based on the drawings. 1st
In the figure, the controlled fluid 1 is a high-temperature fluid containing powder and granules, 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.
A valve body 4 that opens and closes a flow path (port) formed by the valve body 4 is disposed downstream of the valve seat 3. The valve body 4 is slidably supported on both sides by guides 5 provided on the valve body 2, and the valve body 4 is guided by the guides 5 to allow the valve seat 3 to flow freely. The flow rate of the controlled fluid 1 is controlled by moving in and out in a direction across 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 bolts, and the seat ring 6 is in sliding contact with the valve body 4. Further, an opening for inserting the valve body 4 is formed in the valve box 2, and a valve box lid 7 that closes this opening is provided on the valve box 2.
It is fixed with bolts. Furthermore, the valve box lid 7
A seal band 8 is interposed between the valve case lid 7 and the valve case 2, and the seal band 8 seals the gap between the valve case cover 7 and the valve case 2. A valve stem 9 inserted into the valve body 2 through the valve box lid 7 is connected to the base end of the valve body 4.
is slidably supported by the valve box lid 7. Also, valve stem 9
The gap between the valve box lid 7 and the valve box lid 7 is sealed with a bushing 10 and a gland packing 11. Furthermore, a hexagonal mesh 12 made of stainless steel is welded to the inner surface of the valve box 2, and the mesh of the hexsteel 12 is filled with a wear-resistant lining material 13.

As shown in FIGS. 2 and 3, the tip of the valve body 4 is covered with a plurality of wear-resistant ceramic plates 14, and the ceramic plates 14 are made of silicon nitride. There is. In addition, a hexteel 12 is welded and fixed to the upstream plane and tip surface of the valve body 4 that are not covered by the ceramic plate 14, and a part of the downstream plane's tip side, and the mesh of the hexteel 12 is It is filled with a wear-resistant lining material 13.

Each ceramic plate 4 is fixed to a base plate 1-15 made of a heat-resistant metal by welding to the valve body 4 by a fixing pin 16 made of a heat-resistant metal. In other words, fixed pin 1
6 is inserted into the through hole 17 of the ceramic plate 14, and the head u I B a is engaged with the counterbore part 18 of the through hole 17 to lock the ceramic plate 14, and the foot part 16
b is welded and fixed to the base plate 15. An annular groove 19 is formed on the back surface of the ceramic plate 14 facing the base plate 15.

Hereinafter, the effects of the above configuration will be explained.

By operating the valve stem 9, the valve body 4 moves in and out, 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 is as follows:
In the vicinity of the valve body 4, the flow occurs along the surface of the valve body 4. For this reason, the particles contained in the controlled fluid 1 are rubbed against the surface of the valve body 4, causing the surface of the valve body 4 to wear out, and the abrasion effect is particularly strong at the tip of the valve body 4. However, the wear resistance of the tip of the valve body 4 against the controlled fluid 1 is ensured by the ceramic plate 14, so by suppressing wear at the tip of the valve body 4, the life of the valve body 4 is extended, and Control accuracy for the fluid 1 is maintained over a long period of time.

When used at high temperatures, the gap between the ceramic plate 14 and the base plate 15 and the fixing pin 16
The difference in thermal expansion that occurs between the ceramic plates 14 and 15 is absorbed by forming gaps between the ceramic plates 14 and the base plate 15, and when not in use when the controlled fluid 1 does not flow, The gap formed between the ceramic plates 14 is eliminated by shrinkage of the base plate 15. At this time, the particles of the controlled fluid 1 that have flowed into the gap between the ceramic plate 14 and the base plate 15 in the high-temperature operating state are removed from the groove 13 of the ceramic plate 14 when the gap is eliminated in the non-use state. Since the movement of the ceramic plate 14 is not hindered,
Damage to the ceramic plate 14 is prevented.

Effects of the Invention As described above, according to the present invention, by providing the grooves on the back surface of the ceramic plate, the powder and granules in the controlled fluid that have flowed into the gaps in the hot state can be pushed into the grooves in the cold state. This prevents damage to the ceramic plate.

[Brief explanation 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 partial sectional view showing the structure of the ceramic plate attached to the base plate. be. 1... Controlled fluid, 2... Valve box, 3... Valve seat, 4
... Valve body, 12... Hex steel, 13... Lining material, 14... Ceramic plate, 15... Base plate, 16... Fixing pin, 19... Groove.

Claims (1)

[Claims] 1. In a valve body that controls a high-temperature controlled fluid containing powder, a plurality of ceramic plates are provided covering the surface of a metal substrate, and a metal fixing pin that is placed through the ceramic plates is attached to the head. A valve element for a high-temperature slide valve, characterized in that a ceramic plate is locked at the part, the foot part is welded and fixed to a metal base plate, and a groove part is formed on the back surface of the ceramic plate facing the metal base plate. structure.