JP2022076682A - Rotary valve and transport system - Google Patents

Abstract

To provide a rotary valve capable of effectively suppressing abrasion by granules, and to provide a transport system having the rotary valve.SOLUTION: In a rotary valve 5, a first movable plate 23 is arranged in a first opening 22a of a frame 22, and a second movable plate 24 is arranged in a second opening 22b. A first diaphragm 25 covers a gap between the frame 22 and the first movable plate 23, and a second diaphragm 26 covers a gap between the frame 22 and the second movable plate 24. An inner surface 23a of the first movable plate 23 and an inner surface 24a of the second movable plate 24 are a circular concave surface along a circle connecting tips of a plurality of vanes 12 of a rotor 10. Then, the first movable plate 23 and the second movable plate 24 are pressed toward a rotor chamber 27.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotary valve and a transport system having a rotary valve used for transporting powders and granules. In particular, the present invention relates to a rotary valve suitable for a system in which the differential pressure between the inlet and the outlet is relatively large, and a transportation system having the rotary valve.

An example of a conventional rotary valve is disclosed in Patent Document 1. The rotary valve of Patent Document 1 is used as a quantitative supply device (feeder) for powders and granules such as pellets and powders. This rotary valve has a rotor and a casing. The rotor has multiple vanes arranged in a radial pattern. The casing has a body having a rotor chamber and an inlet and an outlet connected to the rotor chamber. In the rotary valve, the powder or granular material enters the rotor chamber through the inlet and is housed in the recess formed between the vanes of the rotor. When the rotor rotates, the powder or granular material is discharged from the recess through the outlet to the transport pipe. Then, the powder or granular material discharged to the transport pipe is transported to the receiving facility by a fluid such as compressed air.

Japanese Unexamined Patent Publication No. 9-58871

Rotary valves are also used to transport sludge such as dredged earth and sand. FIG. 6 shows an example of a rotary valve used for transporting sludge. The rotary valve 905 of FIG. 6 has the same configuration as the rotary valve of Patent Document 1 described above. The rotary valve 905 has a rotor 910 and a casing 920. The casing 920 has a body portion 921 provided with a rotor chamber 927. In the rotary valve 905, sludge enters the rotor chamber 927 through the inlet 931 and is housed in the recess 912a formed between the vanes 912 of the rotor 910. When the rotor 910 rotates, sludge is discharged from the recess 912a through the outlet portion 932 to a transport pipe (not shown). Then, the sludge discharged to the transport pipe is transported to the receiving facility by compressed air and water.

High-pressure air and water are introduced into the transport pipes to transport sludge such as relatively heavy earth and sand. Therefore, the differential pressure between the inlet portion 931 and the outlet portion 932 of the rotary valve 905 becomes large. Therefore, in the rotary valve 905, a tip member 919 that can move in the radial direction is provided at the tip of each vane 912, and the tip member 919 is pressed against the inner surface 921a of the body portion 921. As a result, the airtightness between the inlet portion 931 and the outlet portion 932 is enhanced, and the backflow of sludge is suppressed.

However, as shown in FIG. 7, the tip member 919 is movably arranged in the slit 912b provided at the tip of the vane 912, and there is a small gap between the vane 912 and the tip member 919. Therefore, the sludge passes through this gap due to the differential pressure, the vane 912 is worn by the powder or granular material contained in the sludge, the gap is expanded, more sludge passes through, and the vane 912 is further worn. As a result, there is a problem that the life of the rotor 910 is shortened. In FIG. 7, the flow of sludge is schematically shown by arrows.

Therefore, an object of the present invention is to provide a transport system having a rotary valve and a rotary valve capable of effectively suppressing wear due to powder or granular material.

In order to achieve the above object, the rotary valve according to one aspect of the present invention is a rotary valve having a rotor and a casing, and the rotor is radial from a shaft portion supported by the casing and a shaft portion. The casing has a body having a rotor chamber, an inlet portion connected to the rotor chamber, and an inlet portion connected to the rotor chamber, and the casing is arranged so as to face the entrance portion. A frame having an outlet portion and a frame provided with a first opening and a second opening leading to the rotor chamber and the rotor chamber, and a first movable unit arranged in the first opening. A first that is in close contact with the outer surface of the frame and the outer surface of the first movable plate so as to cover the gap between the plate, the second movable plate arranged in the second opening, and the frame and the first movable plate. It has a diaphragm and a second diaphragm that is in close contact with the outer surface of the frame and the outer surface of the second movable plate so as to cover the gap between the frame and the second movable plate, and has the inner surface of the first movable plate and the inner surface of the first movable plate. The inner surface of the second movable plate is an arc concave surface along a circle connecting the tips of the plurality of vanes, and the first movable plate and the second movable plate are configured to be pushed toward the rotor chamber. It is characterized by being.

According to the present invention, the first movable plate is arranged in the first opening provided in the frame, and the second movable plate is arranged in the second opening. The gap between the frame and the first movable plate is covered by the first diaphragm, and the gap between the frame and the second movable plate is covered by the second diaphragm. The inner surface of the first movable plate and the inner surface of the second movable plate are concave arcs along a circle connecting the tips of a plurality of vanes of the rotor. Then, the first movable plate and the second movable plate are configured to be pushed toward the rotor chamber provided in the frame. As a result, the inner surface of the first movable plate and the inner surface of the second movable plate are pressed against the tip of the vane of the rotor arranged in the rotor chamber. Therefore, it is possible to improve the airtightness between the inlet portion and the outlet portion connected to the rotor chamber without providing a movable member in the plurality of vanes. As a result, it is possible to prevent the formation of gaps through which sludge can pass in the plurality of vanes, and effectively suppress the wear caused by the powder or granular material.

In the present invention, it is preferable that the casing has an outer cylinder portion arranged so as to surround the body portion, and a fluid chamber is provided between the outer cylinder portion and the body portion. By doing so, the pressure of the fluid supplied to the fluid chamber is uniformly applied to the entire outer surface of the first movable plate and the entire outer surface of the second movable plate, and the pressure of the fluid causes the first movable plate and the second movable plate. The board is pushed towards the rotor chamber. Therefore, it is possible to prevent the force for pushing the first movable plate and the second movable plate from being unevenly distributed.

In the present invention, the rotor has two disc-shaped side plates that sandwich the plurality of vanes in the axial direction, and the peripheral portion of the outer surface of the side plate has an inner surface of the side plate as it goes outward in the radial direction. An annular tapered surface formed so as to gradually approach the side is provided, and the rotary valve has an annular rotor gland packing in contact with the tapered surface and a movable plate gland in contact with both end faces of the movable plate. It is preferable that the packing is provided, and the rotor gland packing and the movable plate gland packing are arranged so as to be in contact with each other. By doing so, the gland packing for the rotor and the gland packing for the movable plate can be integrated and sealed between the rotor and the body portion. Therefore, other packing for sealing between the rotor and the body can be omitted.

In the present invention, the casing has an outer cylinder portion arranged so as to surround the body portion, and a fluid chamber is provided between the outer cylinder portion and the side plate of the rotor, and the fluid chamber is provided with the fluid chamber. Is preferably provided with an annular holding member that sandwiches the rotor gland packing between the side plate and the side plate. By doing so, the pressure of the fluid supplied to the fluid chamber is applied to the holding member, and the holding member is pushed toward the side plate of the rotor by the pressure of the fluid. Therefore, the rotor gland packing can be pressed more reliably against the side plate.

In the present invention, it is preferable that the movable plate is made of a material that is more easily slidable and worn than the plurality of vanes. The plurality of vanes rotate while sliding on the inner surface of the movable plate. Since the movable plate is made of a material that is more easily slidable and worn than the plurality of vanes, the wear of the movable plate is larger than that of the plurality of vanes. As a result, it is possible to suppress the wear of the plurality of vanes and prevent the volume of the recesses formed between the vanes from becoming smaller. Further, even if the movable plate is worn, the inner surface of the movable plate is regenerated so as to be an arc concave surface along a circle connecting the tips of the plurality of vanes.

In the present invention, it is preferable that two or more vanes are always in contact with the inner surface of the movable plate. By doing so, the airtightness between the inlet portion and the outlet portion can be further improved.

In order to achieve the above object, the transportation system according to another aspect of the present invention includes a rotary valve, a transportation pipe connected to the rotary valve, and a pumping device for supplying a fluid to the transportation pipe. It is a transportation system, and the rotary valve is characterized by being the rotary valve.

According to the present invention, since the rotary valve of the transportation system is the rotary valve described above, the airtightness between the inlet portion and the outlet portion connected to the rotor chamber is improved without providing a movable member in a plurality of vanes. be able to. As a result, it is possible to prevent the formation of gaps through which sludge can pass in the plurality of vanes, and effectively suppress the wear caused by the powder or granular material.

In the present invention, the casing has an outer cylinder portion arranged so as to surround the body portion, and a fluid chamber is provided between the outer cylinder portion and the body portion. It is preferable that the fluid chamber is configured to supply the fluid. By doing so, the pressure in the fluid chamber becomes higher than the pressure in the rotor chamber, and it is possible to prevent sludge from leaking from the rotor chamber to the fluid chamber.

According to the present invention, wear due to powder or granular material can be effectively suppressed.

It is a figure which shows the schematic structure of the transportation system which concerns on one Example of this invention. It is a perspective view of the rotary valve which the transportation system of FIG. 1 has. It is sectional drawing which follows the line III-III of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a front view which shows the state which the part of the outer cylinder part was removed in the rotary valve of FIG. It is sectional drawing which shows the conventional rotary valve. FIG. 6 is an enlarged cross-sectional view of the rotor vane of the rotary valve of FIG. 6 and its vicinity thereof.

Hereinafter, the transportation system according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a diagram showing a schematic configuration of a transportation system according to an embodiment of the present invention. FIG. 2 is a perspective view of the rotary valve included in the transportation system of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. FIG. 5 is a front view showing a state in which the peripheral wall portion of the outer cylinder portion is removed in the rotary valve of FIG. 2. In FIGS. 2 to 5, the X direction is referred to as the left-right direction, the Y direction is referred to as the front-back direction, and the Z direction is referred to as the up-down direction.

The transportation system 1 shown in FIG. 1 is used for transporting sludge S such as earth and sand excavated by dredging, for example. The transport system 1 has a rotary valve 5. A hopper 81 and a transport pipe 82 are connected to the rotary valve 5. The sludge S conveyed by the conveyor 83 is charged into the hopper 81. Sludge S is discharged from the rotary valve 5 to the transport pipe 82. The sludge S in the transport pipe 82 is transported to the receiving facility 85 by the high-pressure air and water supplied from the pumping device 84.

As shown in FIGS. 2 to 5, the rotary valve 5 has a rotor 10 and a casing 20.

The rotor 10 has a cylindrical shaft portion 11. The shaft portion 11 is arranged along the left-right direction. A rotation drive mechanism (not shown) is connected to the shaft portion 11. The rotor 10 has a plurality of flat plate-shaped vanes 12. Each vane 12 is arranged so as to extend in the radial direction from the shaft portion 11. The rotor 10 has two disk-shaped side plates 13. The two side plates 13 are arranged so as to sandwich the plurality of vanes 12 in the axial direction (X direction). The shaft portion 11, the plurality of vanes 12, and the two side plates 13 are integrally joined by welding. A recess 12a for accommodating the sludge S is formed between the vanes 12.

An annular tapered surface 13c formed so as to gradually approach the inner surface 13b side of the side plate 13 toward the radial outward side of the side plate 13 is provided on the peripheral edge portion of the outer surface 13a of the side plate 13. An annular rotor gland packing 16 is arranged so as to be in contact with the tapered surface 13c.

The rotor 10 has two collars 14. The collar 14 has an annular shape. A shaft portion 11 is inserted inside the collar 14. The collar 14 is fixed to the outer surface 13a of the side plate 13 by bolts. Further, the ring-shaped holding member 15 is arranged so as to be coaxial with the collar 14. The outer diameter of the holding member 15 is the same as the diameter of the side plate 13. The inner diameter of the holding member 15 is larger than the outer diameter of the collar 14. The rotor gland packing 16 is sandwiched between the holding member 15 and the tapered surface 13c of the side plate 13. Further, the V packing 17 is sandwiched between the holding member 15 and the collar 14. In this embodiment, the shaft portion 11, the vane 12, the side plate 13, the collar 14, and the holding member 15 are made of stainless steel.

The casing 20 has a body portion 21, an inlet portion 31, an outlet portion 32, and an outer cylinder portion 40.

The body portion 21 has a frame 22, a first movable plate 23, a second movable plate 24, a first diaphragm 25, and a second diaphragm 26.

The frame 22 has a cylindrical shape. A rotor chamber 27 is provided inside the frame 22. A rotor 10 is arranged in the rotor chamber 27. The diameter of the rotor chamber 27 (inner diameter of the frame 22) is the same as the diameter of the side plate 13. The diameter of the rotor chamber 27 is also the same as the diameter of the circle connecting the tips of the plurality of vanes 12 (that is, the diameter of the circular locus drawn by the tips of the vanes 12 when the rotor 10 is rotated). The frame 22 has a rectangular first opening 22a and a rectangular second opening 22b. The first opening 22a and the second opening 22b are arranged so as to face each other in the front-rear direction (horizontal direction).

The first movable plate 23 has a plate shape having an arcuate cross section. The width (size in the left-right direction) of the first movable plate 23 is the same as the width of the plurality of vanes 12. The first movable plate 23 is arranged in the first opening 22a. The inner surface 23a of the first movable plate 23 is an arc concave surface along a circle connecting the tips of a plurality of vanes 12 of the rotor 10. The outer surface of the first movable plate 23 is an arc convex surface along the outer surface of the frame 22. There is a gap between the upper end surface of the first movable plate 23 and the frame 22, and there is also a gap between the lower end surface of the first movable plate 23 and the frame 22. There is a gap between both end faces (two end faces facing each other in the left-right direction) of the first movable plate 23 and the frame 22, and the movable plate gland packing 28 is arranged in the gap. The movable plate gland packing 28 is sandwiched between the frame 22 and the first movable plate 23.

The second movable plate 24 has a plate shape having an arc-shaped cross section. The width of the second movable plate 24 is the same as the width of the plurality of vanes 12. The second movable plate 24 is arranged in the second opening 22b. The inner surface 24a of the second movable plate 24 is an arc concave surface along a circle connecting the tips of a plurality of vanes 12 of the rotor 10. The outer surface of the second movable plate 24 is an arc convex surface along the outer surface of the frame 22. There is a gap between the upper end surface of the second movable plate 24 and the frame 22, and there is also a gap between the lower end surface of the second movable plate 24 and the frame 22. There is a gap between both end faces of the second movable plate 24 and the frame 22, and the movable plate gland packing 29 is arranged in the gap. The movable plate gland packing 29 is sandwiched between the frame 22 and the second movable plate 24.

The first movable plate 23 and the second movable plate 24 are made of a non-ductile material (for example, casting, gunmetal, crystalline metal, resin cement). The first movable plate 23 and the second movable plate 24 are made of a material that is more easily slidable and worn than the vane 12.

Two or more vanes 12 are always in contact with the inner surface 23a of the first movable plate 23 and the inner surface 24a of the second movable plate 24.

The first diaphragm 25 is a sheet having a square frame shape. The first diaphragm 25 is arranged so as to cover the gap between the frame 22 and the first movable plate 23. The first diaphragm 25 is pressed by a pressing member (not shown) so as to be in close contact with the outer surface of the frame 22 and the outer surface of the first movable plate 23. The first diaphragm 25 holds the first movable plate 23 so as to be movable in the front-rear direction.

The second diaphragm 26 is a sheet having a square frame shape. The second diaphragm 26 is arranged so as to cover the gap between the frame 22 and the second movable plate 24. The second diaphragm 26 is pressed by a pressing member (not shown) so as to be in close contact with the outer surface of the frame 22 and the outer surface of the second movable plate 24. The second diaphragm 26 holds the second movable plate 24 so as to be movable in the front-rear direction.

The first diaphragm 25 and the second diaphragm 26 are made of a flexible material (for example, hard rubber, rubber containing metal wire, rubber containing hemp).

The inlet portion 31 has a circular tube shape. The inlet portion 31 is integrally joined to the body portion 21 so as to extend upward from the body portion 21. The entrance portion 31 is connected to the rotor chamber 27. A hopper 81 is connected to the entrance portion 31. The entrance portion 31 is open to the atmosphere.

The outlet portion 32 has a circular tube shape. The outlet portion 32 is integrally joined to the body portion 21 so as to extend downward from the body portion 21. The outlet portion 32 is connected to the rotor chamber 27. The inlet portion 31 and the exit portion 32 are arranged so as to face each other in the vertical direction. A transport pipe 82 is connected to the outlet portion 32. High-pressure air and water are supplied to the transport pipe 82 from the pressure feeding device 84.

The outer cylinder portion 40 has a cylindrical shape with both ends closed. The outer cylinder portion 40 is arranged so as to surround the body portion 21. The outer cylinder portion 40 has a peripheral wall portion 41 and two side wall portions 42. The peripheral wall portion 41 is formed so as to be divisible in the front-rear direction. The two side wall portions 42 are arranged so as to sandwich the peripheral wall portion 41 in the axial direction (X direction). A stuffing box 43 is provided on the side wall portion 42. A bearing 44 and a packing 45 are arranged in the stuffing box 43. The bearing 44 supports the shaft portion 11 of the rotor 10. The packing 45 seals between the shaft portion 11 and the stuffing box 43. Further, a plurality of adjusting screws 46 are attached to each side wall portion 42. The plurality of adjusting screws 46 adjust the force for pressing the holding member 15 against the rotor gland packing 16.

A first fluid chamber 47 is formed between the peripheral wall portion 41 and the body portion 21. A second fluid chamber 48 is formed between the side wall portion 42 and the side plate 13 of the rotor 10. The first fluid chamber 47 and the second fluid chamber 48 are connected to each other. High-pressure water is supplied from the pumping device 84 to the first fluid chamber 47 and the second fluid chamber 48 via the pipe 86. The pipe 86 is provided with a degassing valve (not shown). The degassing valve bleeds air from the water flowing through the pipe 86 and ensures the incompressible function of the water supplied to the first fluid chamber 47 and the second fluid chamber 48. When the powder or granular material handled by the rotary valve 5 is not preferably mixed with water, gelled water (for example, water-absorbing polymer, gelatin, agar) is supplied to the first fluid chamber 47 and the second fluid chamber 48. You may do so.

The water supplied to the first fluid chamber 47 pushes the first movable plate 23 and the second movable plate 24 toward the rotor chamber 27. The water supplied to the second fluid chamber 48 pushes the holding member 15 toward the rotor gland packing 16.

Next, the operation of the rotary valve 5 will be described. In the rotary valve 5, the sludge S charged into the hopper 81 passes through the inlet portion 31 and is accommodated in the recess 12a of the rotor 10. When the rotor 10 is rotated, the sludge S is discharged from the recess 12a through the outlet portion 32 to the transport pipe 82. The sludge S discharged to the transport pipe 82 is transported to the receiving facility 85 by high-pressure air and water.

High-pressure water is supplied from the pressure feeding device 84 to the first fluid chamber 47 of the rotary valve 5. The high-pressure water in the first fluid chamber 47 pushes the first movable plate 23 and the second movable plate 24 toward the rotor chamber 27. As a result, the inner surface 23a of the first movable plate 23 and the inner surface 24a of the second movable plate 24 are pressed against the tips of the plurality of vanes 12, and the airtightness between the inlet portion 31 and the outlet portion 32 is ensured. Therefore, even when the pressure difference between the inlet portion 31 and the outlet portion 32 is large, the backflow of sludge S can be suppressed.

As described above, the rotary valve 5 of this embodiment has a rotor 10 and a casing 20. The rotor 10 has a shaft portion 11 supported by the casing 20 and a plurality of vanes 12 radially extending from the shaft portion 11. The casing 20 is connected to the body portion 21 having the rotor chamber 27, the inlet portion 31 connected to the rotor chamber 27, and the rotor chamber 27, and the outlet portion 32 is arranged so as to face the inlet portion 31 in the vertical direction. And have. The body portion 21 has a frame 22, a first movable plate 23, a second movable plate 24, a first diaphragm 25, and a second diaphragm 26. The frame 22 is provided with a rotor chamber 27 and a first opening 22a and a second opening 22b leading to the rotor chamber 27. The first movable plate 23 is arranged in the first opening 22a. The second movable plate 24 is arranged in the second opening 22b. The first diaphragm 25 is in close contact with the outer surface of the frame 22 and the outer surface of the first movable plate 23 so as to cover the gap between the frame 22 and the first movable plate 23. The second diaphragm 26 is in close contact with the outer surface of the frame 22 and the outer surface of the second movable plate 24 so as to cover the gap between the frame 22 and the second movable plate 24. The first opening 22a and the second opening 22b are arranged so as to face each other in the front-rear direction. The inner surface 23a of the first movable plate 23 and the inner surface 24a of the second movable plate 24 are arc concave surfaces along a circle connecting the tips of a plurality of vanes 12. The first movable plate 23 and the second movable plate 24 are configured to be pushed toward the rotor chamber 27.

As a result, the inner surface 23a of the first movable plate 23 and the inner surface 24a of the second movable plate 24 are pressed against the tip of the vane 12 of the rotor 10 arranged in the rotor chamber 27. Therefore, the airtightness between the inlet portion 31 and the outlet portion 32 connected to the rotor chamber 27 can be improved without providing a movable member in the plurality of vanes 12. As a result, it is possible to avoid the formation of a gap through which the sludge S can pass in the plurality of vanes 12, and effectively suppress the wear caused by the powder or granular material.

Further, the casing 20 has an outer cylinder portion 40 arranged so as to surround the body portion 21. A first fluid chamber 47 is provided between the outer cylinder portion 40 and the body portion 21. By doing so, the pressure of the water supplied to the first fluid chamber 47 is uniformly applied to the entire outer surface of the first movable plate 23 and the entire outer surface of the second movable plate 24, and the pressure causes the first movable plate 23. And the second movable plate 24 is pushed toward the rotor chamber 27. Therefore, it is possible to prevent the force for pushing the first movable plate 23 and the second movable plate 24 from being unevenly distributed. The rotary valve 5 may adopt a configuration in which the first movable plate 23 and the second movable plate 24 are pushed toward the rotor chamber 27 by using a spring member or the like.

Further, the rotor 10 has two disc-shaped side plates 13 that sandwich the plurality of vanes 12 in the axial direction. An annular tapered surface 13c formed so as to gradually approach the inner surface 13b side of the side plate 13 toward the outer side in the radial direction is provided on the peripheral edge portion of the outer surface 13a of the side plate 13. The rotary valve 5 has an annular rotor gland packing 16 in contact with the tapered surface 13c of each side plate 13, a movable plate gland packing 28 in contact with both end faces of the first movable plate 23, and both sides of the second movable plate 24. It has a gland packing 29 for a movable plate that is in contact with the end face. The rotor gland packing 16 and the movable plate gland packings 28 and 29 are arranged so as to be in contact with each other. By doing so, the rotor gland packing 16 and the movable plate gland packings 28 and 29 are integrated, and the space between the rotor 10 and the body portion 21 can be sealed. Therefore, another packing for sealing between the rotor 10 and the body portion 21 can be omitted.

Further, the casing 20 has an outer cylinder portion 40 arranged so as to surround the body portion 21. A second fluid chamber 48 is provided between the outer cylinder portion 40 and the side plate 13 of the rotor 10. In the second fluid chamber 48, an annular holding member 15 that sandwiches the rotor gland packing 16 with the side plate 13 is arranged. By doing so, the pressure of the water supplied to the second fluid chamber 48 is applied to the holding member 15, and the holding member 15 is pushed toward the side plate 13 of the rotor 10. Therefore, the rotor gland packing 16 can be more reliably pressed against the side plate 13.

Further, the first movable plate 23 and the second movable plate 24 are made of a material that is more easily slidable and worn than the plurality of vanes 12. The plurality of vanes 12 rotate while sliding on the inner surface 23a of the first movable plate 23 and the inner surface 24a of the second movable plate 24. Since the first movable plate 23 and the second movable plate 24 are made of a material that is more easily slidable and worn than the plurality of vanes 12, the first movable plate 23 and the second movable plate 24 are formed from the plurality of vanes 12. Increased wear. As a result, it is possible to suppress the wear of the plurality of vanes 12 and prevent the volume of the recesses 12a formed between the vanes 12 from becoming smaller. Further, even if the first movable plate 23 and the second movable plate 24 are worn, the inner surfaces 23a and the inner surfaces 24a are regenerated so as to be an arc concave surface along a circle connecting the tips of the plurality of vanes 12.

Further, two or more vanes 12 are always in contact with the inner surface 23a of the first movable plate 23 and the inner surface 24a of the second movable plate 24. By doing so, the airtightness between the inlet portion 31 and the outlet portion 32 can be further improved. In this embodiment, the rotor 10 has eight vanes 12, but the number of vanes 12 is arbitrary as long as it does not contradict the gist of the present invention.

Further, the transportation system 1 is configured such that the pumping device 84 supplies fluid to the first fluid chamber 47 and the second fluid chamber 48. By doing so, the pressure of the first fluid chamber 47 and the pressure of the second fluid chamber 48 become equal to or higher than the pressure of the rotor chamber 27. Therefore, it is possible to prevent sludge S from leaking from the rotor chamber 27 to the first fluid chamber 47 and the second fluid chamber 48.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is not contrary to the above-mentioned embodiments, those skilled in the art appropriately adding, deleting, or changing the design, or combining the features of the examples as appropriate are also present inventions. Is included in the range of.

1 ... Transport system, 5 ... Rotary valve, 10 ... Rotor, 11 ... Shaft, 12 ... Vane, 12a ... Recess, 13 ... Side plate, 13a ... Outer surface, 13b ... Inner surface, 13c ... Tapered surface, 14 ... Collar, 15 ... Holding member, 16 ... rotor gland packing, 17 ... V packing, 20 ... casing, 21 ... body, 22 ... frame, 22a ... first opening, 22b ... second opening, 23 ... first movable plate, 23a ... inner surface , 24 ... 2nd movable plate, 24a ... Inner surface, 25 ... 1st diaphragm, 26 ... 2nd diaphragm, 27 ... Rotor chamber, 28, 29 ... Movable plate gland packing, 31 ... Entrance part, 32 ... Exit part, 40 ... outer cylinder, 41 ... peripheral wall, 42 ... side wall, 43 ... stuffing box, 44 ... bearing, 45 ... packing, 46 ... adjusting screw, 47 ... first fluid chamber, 48 ... second fluid chamber, 81 ... hopper , 82 ... transport pipe, 83 ... conveyor, 84 ... pumping device, 85 ... receiving equipment, 86 ... piping, S ... sludge

Claims (8)

A rotary valve with a rotor and casing
The rotor has a shaft portion supported by the casing and a plurality of vanes radially extending from the shaft portion.
The casing has a body having a rotor chamber, an inlet portion connected to the rotor chamber, and an outlet portion connected to the rotor chamber and arranged so as to face the inlet portion.
The body portion is arranged in the rotor chamber, a frame provided with a first opening and a second opening leading to the rotor chamber, a first movable plate arranged in the first opening, and the second opening. A first diaphragm in close contact with the outer surface of the frame and the outer surface of the first movable plate so as to cover the gap between the frame and the first movable plate, and the frame and the second movable plate. It has an outer surface of the frame and a second diaphragm in close contact with the outer surface of the second movable plate so as to cover the gap with the plate.
The inner surface of the first movable plate and the inner surface of the second movable plate are arc concave surfaces along a circle connecting the tips of the plurality of vanes.
A rotary valve characterized in that the first movable plate and the second movable plate are configured to be pushed toward the rotor chamber. The casing has an outer cylinder portion arranged so as to surround the body portion, and the casing has an outer cylinder portion.
The rotary valve according to claim 1, wherein a fluid chamber is provided between the outer cylinder portion and the body portion. The rotor has two disc-shaped side plates that sandwich the plurality of vanes in the axial direction.
An annular tapered surface formed so as to gradually approach the inner surface side of the side plate as it goes outward in the radial direction is provided on the peripheral edge of the outer surface of the side plate.
The rotary valve has an annular rotor gland packing in contact with the tapered surface and a movable plate gland packing in contact with both end faces of the movable plate.
The rotary valve according to claim 1 or 2, wherein the rotor gland packing and the movable plate gland packing are arranged so as to be in contact with each other. The casing has an outer cylinder portion arranged so as to surround the body portion, and the casing has an outer cylinder portion.
A fluid chamber is provided between the outer cylinder portion and the side plate of the rotor.
The rotary valve according to claim 3, wherein in the fluid chamber, a ring-shaped holding member that sandwiches the rotor gland packing between the fluid chamber and the side plate is arranged. The rotary valve according to any one of claims 1 to 4, wherein the movable plate is made of a material that is more easily slidable and worn than the plurality of vanes. The rotary valve according to any one of claims 1 to 5, wherein two or more vanes are always in contact with the inner surface of the movable plate. A transportation system including a rotary valve, a transportation pipe connected to the rotary valve, and a pumping device for supplying a fluid to the transportation pipe.
The transportation system according to any one of claims 1 to 6, wherein the rotary valve is the rotary valve. The casing has an outer cylinder portion arranged so as to surround the body portion, and the casing has an outer cylinder portion.
A fluid chamber is provided between the outer cylinder portion and the body portion.
The transportation system according to claim 7, wherein the pumping device is configured to supply a fluid to the fluid chamber.

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