JPH0151709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention prevents foreign matter from getting caught between the sealing packing and the valve surface in a ball valve.
This invention relates to a device for preventing foreign matter from getting caught in a ball valve.

Conventionally, this type of valve sealing packing has been installed as shown in FIGS. 1 and 2. To explain this, FIG. 1 is a longitudinal sectional view in the diametrical direction of the object passage of a conventional ball valve, and FIG. 2 is a detailed enlarged view of section A in FIG. 1, including the seal packing installation part. In the figure, reference numeral 1 denotes an object passage in the ball valve 2, which is bored in the diametrical direction of the ball valve 2. The ball valve 2 is supported and disposed within a casing 4 so as to be rotatable in the direction indicated by an arrow n. A seal 5 is implanted on the inner peripheral surface of the casing 4 so as to surround the passage 1 and come into close sliding contact with the surface of the ball valve 2 when the ball valve 2 disposed inside the casing 4 is in an open state. It's a pack king. 3a is casing 4
The object inlet passage 3b is an object discharge passage through which objects are discharged through the passage 3a and the passage 1 of the ball valve 2. The open state of the passage 1 in the ball valve 2 shown in FIG. 1 is shown by a solid line, and the closed state is shown by a chain line. When the passage 1 is open, gas, liquid, and granular material (hereinafter collectively referred to as granular material) pass through the object passage 3a of the casing 4 and the ball valve object passage 1 to the object passage 3b of the casing 4.
When the passage 1 is closed, movement of the powder from the passage 3a to the passage 3b is prevented by the action of the ball valve 2 and the sealing packing 5. Therefore, the ball valve 2 is rotated to open and close the ball valve 2 to move the powder or to prevent its movement.

In the conventional ball valve having the above-mentioned structure and operation, when this ball valve is used as a movement shutoff valve for powder or a shutoff valve for a fluid that is easily mixed with powder or grain, the ball valve 2 is rotated. When this happens, the powder gets caught in the gap between the surface of the ball valve 2 and the inner peripheral surface of the casing 4, damaging the surface of the sealing packing 5. As a result, fluid such as gas or liquid flows into the ball valve 2.
leaks from the passages 3a to 3b (or in the opposite direction) through the gap formed between the surface of the casing 4 and the inner peripheral surface of the casing 4, especially when the pressure difference between the passages 3a and 3b is large. The amount of leakage is large;
The ball valve 2 will no longer be able to perform its original function as a valve.

This invention has been made in view of the above, and foreign matter such as powder gets caught in the gap formed between the ball surface of the ball valve and the inner circumferential surface of the casing 4 that accommodates and supports the ball valve. The object of the present invention is to provide a device for preventing foreign matter from getting caught in a ball valve, which can prevent damage to the sealing surface of a sealing packing 5 implanted on the inner circumferential surface of a ball valve support.

That is, the present invention provides a seal implanted on the inner peripheral surface of the casing of the ball valve so as to surround the object passage provided in the ball valve and come into close sliding contact with the surface of the ball valve when the ball valve is in an open state. In order to prevent foreign matter from getting caught in the sliding contact surface between the ball valve surface and the sealing packing, a two-stage fin for preventing foreign matter from getting caught is installed along the packing on the inside of the packing, and the end surface of the ball valve A first fluid spout is formed between these two stages of fins, and a ball valve opening is formed between the outer fin and the side wall of the seal packing installation groove. A second fluid jet port is formed across the end face of the ball valve body passage in the state, and a fluid supply hole for supplying fluid to these jet ports is bored in the casing of the ball valve so as to communicate with the outside. A device for preventing foreign matter from getting caught in a ball valve is characterized by:

Hereinafter, the present invention will be explained in detail with reference to the drawings showing one embodiment thereof. FIG. 3 is a longitudinal sectional view in the diameter direction of the object passage of a ball valve equipped with a foreign object trap prevention device according to the present invention, and FIG. 4 is a detailed enlarged view of section B in FIG. 3. In FIGS. 3 and 4, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals. 1 is a passage for objects such as powder or granules in the ball valve 2;
3 is a ball valve casing that accommodates and supports the ball valve 2, and 3a and 3b are passages for objects such as powder or granules in the casing 4, respectively. 5 is a part of the casing 4 so as to surround the passage 1 formed in the ball valve 2 and come into close sliding contact with the surface of the ball valve 2 when the ball valve 2 disposed in the casing 4 is in an open state. This is a sealing packing installed in a groove 14 on the inner circumferential surface. The side wall of this seal packing installation groove 14 is indicated by reference numeral 15. In FIG. 3, the chain line in the ball valve 2 indicates the passage 1 of the ball valve 2 when the ball valve 2 is in a closed state. 10a and 10b are fins with a chevron-shaped cross section that are implanted in an annular groove 11 carved along the packing 5 inside the position where the seal packing 5 is installed in the casing 4; 10a is the inner fin;
indicates the outer fin. The inner fin 10a is in close contact with the side wall of the groove 11, and its tip protrudes from the inner peripheral surface of the casing 4, so that its tip surface comes into sliding contact with the surface of the ball valve 2. The bottom surface of this inner fin 10a is in close contact with the bottom surface of the groove 11. The outer fin 10b branches from the inner fin 10a,
A first fluid spout 13 between the inner fin 10a and the inner fin 10a.
The tip surface extends so as to come into sliding contact with the surface of the ball valve 2 so as to form a shape a. outer fin 10
A second fluid jet port 13b is formed between the second fluid spout 13b and the side wall 15 of the seal packing groove 14 so as to span the end surface of the object passage 1 of the ball valve when the ball valve is in the open state. That is, as shown in FIG. 3, the diameter _dB of the object passage 1 of the ball valve 2 is set larger than the diameter _dC of the object passages 3a, 3b of the casing 4.

Reference numeral 12 denotes a perforation hole provided in the casing 4, one end of which opens on the outer surface of the casing 4, and the other end of which opens into the bottom surface of the fin, and between the fins 10a and 10b, and between the fin 10b and the sealing packing 5. These are fluid supply holes for gas or liquid that communicate with fluid jet ports 13a and 13b, respectively, formed between the groove side wall 15 and the side wall 15 of the planting groove.

Since this invention has the above-mentioned configuration, when the ball valve 2 is rotated, foreign substances such as powder particles that are likely to get caught in the sliding surface between the seal packing 5 and the ball valve 2 are removed from the seal packing 5. Its forward movement is prevented by a two-stage sliding surface formed by the fins 10a and 10b implanted inside the ball valve 2 and the surface of the ball valve 2, and the fluid passes through the fluid supply hole 12 provided in the casing 4. The inert gas supplied to the planting grooves 11 of the fins 10a and 10b is
It is ejected from fluid jet ports 13a and 13b formed between the fins 10b and the side wall 15 of the seal packing installation groove 14, respectively.
This ejected inert gas actively blows away foreign substances such as powder and granules that are trapped. That is, since the packing 5 tightly slides on the ball valve 2 and tightly blocks passage of fluid, the fins 10a, 10
As the inert gas is ejected inward from the minute gap between the tip end face of b and the object passage end face of the ball valve 2, foreign matter such as powder or granules gets caught in the sealing packing 5 and moves inward. Fin 1
0b prevents its progress, and is carried by the jet stream ejected from the ejection port 13b, progressing toward the inner position of the fin 10b, and being transferred into the passage 1 of the ball valve 2. This prevents foreign matter such as powder from getting caught in the sliding contact area between the tip surface of the sealing packing 5 and the ball valve 2. Furthermore, even if foreign matter such as powder passes through the fins of the first stage, the fins of the second stage act in the same manner as described above, and the end surface of the packing 5 for sealing the foreign matter and the surface of the ball valve 2 are connected to each other. It is possible to prevent the material from getting caught in the seal surface formed by the material. Diameter of object passage in ball valve 2
_dB is formed to be slightly larger than the diameter _dC of the object passages 3a, 3b in the casing 4, and the fluid jet port 13 in the fin 10 is connected to the object passage of the ball valve 2 when the ball valve 2 rotates in the fully open direction. 1, so even if foreign matter gets caught in the sliding surface between the fin 10 and the surface of the ball valve 2,
When the ball valve is fully open, the foreign object
Since the foreign matter is transported and removed by the jet flow of inert gas jetted from the fluid jet port 13 formed by the inert gas, the foreign matter trapped in the sealing packing 5 is eliminated.

When the object passage 1 enters the fluid jet port 13a during the opening operation of the ball valve 2, this fluid jet port 13
a communicates with the object passage 1, and foreign matter in the fluid jet port 13 is blown away into the object passage 1 and removed. Furthermore, since the fluid jet port 13b is in a closed state,
The fin 10b is strongly pressed against the ball valve 2 by the back pressure to prevent foreign matter from entering the packing 5 side.

The structure and operation of the present invention have been described above, and examples of use will be described below. FIG. 5 is a schematic diagram of the main parts of the coal gasifier. In the same figure, 3
Reference numeral 1 denotes a high-pressure reaction tank, above which raw coal hoppers 32a and 32b are arranged in parallel and communicated with the reaction tank 31 through ducts 34a and 34b via ball valves 33a and 33b, respectively, which are equipped with the present invention. It is connected. The hopper 32a,
At the top of 32b, there is a coking coal input port 35, respectively.
a, 35b are further provided with pressure valves 36a, 36b and pressure relief valves 37a, 37b, respectively. A residue hopper 38 is located below the reaction tank 31.
a and 38b are respectively arranged, and the residue hopper 38
The upper parts of ducts 40a and 38b are connected to ducts 40a and 38b through ball valves 39a and 39b, respectively, which are equipped with the present invention.
40b are connected to the lower part of the reaction tank 31, respectively. Residue discharge ducts 41a and 41b are provided at the lower ends of the hoppers 38a and 38b, respectively.
are provided and communicated with the atmosphere through ball valves 42a and 42b, each equipped with the present invention. Further, pressure valves 43a, 43b and pressure relief valves 44a, 44b are installed above the hoppers 38a, 38b, respectively, so as to communicate with the insides of the hoppers 38a, 38b, respectively. In the main part of the coal gasification apparatus described above, the ball valve 33a is closed to block the flow of gas from the reaction tank 31 into the coking coal hopper 32a, and in this state, the pressure relief valve 37a is opened to produce the coking coal. Hoppa 32a
The internal pressure of the liquid is set to atmospheric pressure, the lid 35a is opened, and the liquid is introduced into the hopper 32a.Then, the lid 35a is sealed and the valve 37a is closed, and the pressurizing valve 36
a is opened, high-pressure inert gas (high-pressure nitrogen gas, high-pressure combustion exhaust gas, etc.) is supplied into the hopper 32a from a supply source not shown in the drawings through the valve 36a, and the internal pressure of the hopper 32a is changed to the reaction tank 31. The ball valve 33a is opened to balance the internal pressure of the reaction tank 31 through the duct 34a.
supplied within. Meanwhile, raw coal is also charged into the raw coal hopper 32b by the same operation as described above, and when the hopper 32a becomes empty, raw coal is supplied into the reaction tank 31 by the same operation as described above. . In this way, raw coal is alternately and continuously supplied into the reaction tank 31 from the hoppers 32a and 32b. The residue after the completion of the reaction is discharged from the reaction tank 31 through the ball valve 3.
With 9a and 42a closed, the hopper 38
After making airtight the pressurizing valve 43a, high-pressure inert gas is injected into the hopper 38a from a supply source not shown in the drawing, and the hopper 38
After balancing the internal pressure of a and the internal pressure of the reaction tank 31, the ball valve 39a is opened to transfer the residue in the reaction tank 31 into the hopper 38a,
When the hopper 38a is filled with residue, the ball valve 39a is closed and the pressure relief valve 44a is opened to bring the internal pressure of the hopper 38a to atmospheric pressure.
A is opened and the process is carried out from the duct 41a. In this case as well, the hoppers 38a and 38b can be operated alternately as described above to continuously discharge the residue without reducing the internal pressure of the reaction tank 31. Moreover, the ball valves 33a, 33b, 39a,
42a, 42b, fluid can be supplied to the fluid spout 13 formed by the foreign object biting prevention fin 10 through the fluid supply hole 12 of the present invention at all times or before the ball valve is rotated. good. As understood from the above explanation, in this case the ball valves 33a, 33b, 39a, 39b, 42a,
42b receives the internal pressure of the reaction tank 31, so it goes without saying that the pressure of the fluid jetted out from the fluid jet ports 13 in these ball valves must be higher than the internal pressure of the reaction tank 31. In addition, in the above usage example, the pressure relief valves 37a, 3
7b, 44a, 44b pressurizing valve 36a, 36b, 4
Since the valves 3a and 43b also receive the internal pressure of the reaction tank 31 during their operation, and gas containing foreign matter such as powder passes through them, these valves are also equipped with the foreign matter trapping prevention device according to the present invention. can be applied effectively.

Since this invention has the structure and operation described above, according to the invention, the fins that slide on the surface of the ball valve can actively scrape off foreign matter adhering to the ball valve, and remove the foreign matter that has fallen. You can blow it away. This is particularly advantageous for powders that are more or less sticky. Thus, according to this invention,
It is possible to prevent foreign matter from getting caught in the sliding surface between the rotating valve surface and the sealing packing installed on the inner circumferential surface of the casing that accommodates and supports the valve, thereby preventing the sliding surface from being damaged. Therefore, the valve function can be fully exerted, and the industrial effect is remarkable.The present invention also provides a system for supplying coking coal to the reaction tank and a system for discharging residue from the reaction tank in the above-mentioned coal gasification equipment. It can also be effectively applied to supply systems for raw material ore and reduced coke in blast furnaces, heat medium supply systems to oil heat medium decomposition equipment, catalyst supply systems to oil gasification furnaces, etc. The scope of application is wide.

[Brief explanation of drawings]

Fig. 1 is a diametrical longitudinal cross-sectional view of the object passage of a conventional ball valve, Fig. 2 is a detailed enlarged view of section A in Fig. 1, and Fig. 3 is a ball equipped with a foreign object jamming prevention device according to the present invention. FIG. 4 is a detailed enlarged view of section B in FIG. 3, and FIG. 5 is a schematic diagram of the main parts of a coal gasification apparatus illustrating an example of use of the present invention. 1...Ball valve body passage, 2...Ball valve, 3a,
3b...Object passage in the casing, 4...Ball valve casing, 5...Seal packing, 10a, 10
b... Fin for preventing foreign matter from getting caught, 11... Annular groove, 1
2...Fluid supply hole, 13a, 13b...Fluid spout,
14... Packing installation groove, 15... Side wall, d _C ... Object passage diameter in casing, d _B ... Ball valve body passage diameter.

Claims (1)

[Claims] 1. The inner position of the seal packing that is implanted on the inner peripheral surface of the casing of the ball valve so as to surround the object passage provided in the ball valve and come into close sliding contact with the ball valve surface when the ball valve is in the open state. Along the packing, in order to prevent foreign objects from being caught in the sliding contact surface between the ball valve surface and the sealing packing, a two-stage fin for preventing foreign objects from being caught is provided, the tip surface of which slides into contact with the ball valve surface. A first fluid spout is formed between these two fins, and a ball is formed between the outer fin and the side wall of the seal packing groove when the ball valve is in the open state. A ball, characterized in that a second fluid jetting port is formed across the end face of the valve body passage, and a fluid supply hole for supplying fluid to the jetting port is bored in the casing of the ball valve so as to communicate with the outside. Device to prevent foreign objects from getting caught in the valve.