JP2997170B2 - Rotary valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve used for supplying a raw material to a high-pressure vessel and discharging the raw material from the high-pressure vessel when processing the raw material in the high-pressure vessel.

[0002]

2. Description of the Related Art A rotary valve of this kind is disclosed, for example, in Japanese Utility Model Publication No. 48-35889. The known rotary valve comprises a rotor housing having an inlet connected to the atmosphere and an outlet connected to a high-pressure vessel. The rotor is accommodated in the rotor housing, and a plurality of pockets are formed on the outer peripheral surface of the rotor. Furthermore, the rotor housing
When viewed from the rotation direction of the rotor, a plurality of first communication ports on the pressure increasing side are formed between the inlet and the outlet, and a plurality of second communication ports on the pressure reducing side are formed between the outlet and the inlet. The first and second communication ports are opened on the inner peripheral surface of the rotor housing, and each of the first communication ports is connected to the corresponding second communication port via a pressure equalizing pipe.

[0003] The raw material introduced into the inlet of the rotor housing is received in one pocket of the rotor as the rotor rotates, and is carried to the outlet together with the pocket. At this time, the pockets receiving the raw materials are sequentially connected to the first communication port, and each time the connection is made, the pockets from the outlet to the inlet are sequentially communicated via the second communication port and the equalizing pipe, and both pockets are connected. The pressure inside is equalized.

[0004] Therefore, in the pocket from the inlet to the outlet, the internal pressure is gradually increased from the atmospheric pressure, and when reaching the outlet, the received raw material can be supplied to the high-pressure vessel, while the pocket from the outlet to the inlet. The internal pressure of the heading pocket is gradually reduced from the pressure in the high-pressure container, and reaches the inlet. Therefore, if the above-described rotary valve is used, the raw material is continuously supplied into the high-pressure container while suppressing the pressure loss in the high-pressure container, that is, the gas flow that escapes from the high-pressure container through the rotary valve. be able to.

On the other hand, when the inlet of the rotor housing is connected to the high-pressure vessel and the outlet is open to the atmosphere, the material in the high-pressure vessel is continuously discharged while suppressing the pressure loss in the high-pressure vessel. Can be. By the way, in the above-mentioned rotary valve, since each pocket of the rotor is used for transferring the raw material, it is necessary to arrange a screen filter in the opening of each communication pocket opened on the inner peripheral surface of the rotor housing. The filter prevents the material in the pocket from entering the communication port.

[0006] That is, when the pressure between the pressure-increase side pocket from the inlet to the outlet and the pressure-reduction side pocket from the exit to the inlet is equalized, the pressure is increased from the high-pressure side pocket to the low-pressure side pocket. Since the gas flows, the raw material in the pocket tries to enter the communication port together with the gas flow. In particular, when the rotor valve is used for discharging the raw material from the high-pressure vessel, the pressure-reducing pocket going from the inlet to the outlet is on the high-pressure side. The raw material will flow out toward the pressure-increase side pocket from the outlet to the inlet.

[0007]

In the above-mentioned screen filter, since the openings of the first and second communication ports are circular, a large number of through holes are uniformly distributed on a thin disk. Is set sufficiently smaller than the material to be handled. As the rotor rotates, the rotor comes into sliding contact with the screen filter. However, if hard foreign matter is mixed in the raw material, the foreign matter gets caught between the rotor and the screen filter, and a gap between the through holes of the screen filter. Cracks may occur.

[0008] Here, since the through holes of the screen filter are uniformly distributed, once a crack is generated in the screen filter, the crack is liable to grow while propagating to the adjacent through hole. Therefore, the operating rate of the rotary valve decreases. In addition, in the case of this type of rotary valve, in order to increase the throughput of the raw material, it is obvious that the rotor pocket is enlarged,
In order to reduce the time required for pressure equalization, it is necessary to increase the opening of each communication port. However, when the opening of the communication port becomes large, the screen filter itself also becomes large, and in this case, it becomes difficult to process the screen filter. That is, the surface of the screen filter on the rotor side is
It must be formed in an arc surface having the same curvature as the inner peripheral surface of the rotor housing.

Further, in order to stably equalize the pressure in the pockets on the pressure increasing side and the pressure reducing side, the first and second communication ports must communicate with each other through an equalizing pipe. When the communication port intrudes into the communication port through the through hole and the communication port is clogged by the accumulation of the debris, the pressure equalizing operation between both pockets cannot be performed stably.

The present invention has been made on the basis of the above-mentioned circumstances. It is an object of the present invention to reduce the frequency of replacing a screen filter, improve the operation rate thereof, and further reduce the raw material processing capacity. An object of the present invention is to provide a rotary bubble that contributes to increase and stable pressure equalizing operation.

[0011]

According to the present invention, there is provided a rotary valve of the type described above, wherein a screen filter provided at each of the openings of the first and second communication ports comprises:
It is composed of a plurality of filter regions in which through holes are distributed, and a partitioned region separating adjacent filter regions. Preferably, a first and a second opening on the inner peripheral surface of the rotor housing
The opening of the communication port and the screen filter extend in the axial direction of the rotor, and each communication port is branched into a plurality of screen filter sides and connected to the filter region of the screen filter.

[0012]

If the rotary valve has the above-mentioned screen filter, even if a crack is generated in one filter area due to foreign matter being caught, the growth of the crack is limited only by the partition area in the filter area. Can be suppressed. When the opening of each communication hole and the screen filter extend in the axial direction of the rotor, the opening area is sufficiently secured while facilitating the processing of the screen filter.

If the communication port is branched into a plurality of ports on the screen filter side, even if one of the communication ports is clogged, a stable pressure equalizing operation is ensured by the other branches. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a rotary valve has a rotor housing 2 which is
Has a rotor bore formed therein, an inlet 4 and an outlet 6, and the inlet 4 and the outlet 6 are positioned vertically. The outlet 6 is not shown in FIG.

A rotor 8 is rotatably accommodated in a rotor bore of the rotor housing 2. The rotor 8 has a rotor shaft 10, and both ends of the rotor shaft 10 are rotatably supported by the rotor housing 2. Referring to FIG. 2, the structure of the rotor housing 2 is shown in more detail. The rotor housing 2 has a housing body 3 surrounding the rotor 8 and a pair of end walls 12 sandwiching both sides of the housing body 3. These end walls 12 are formed in the rotor housing 2 on both sides of the rotor 8 by a pair of side chambers 18 and 20.
Is formed.

Both ends of the rotor shaft 10 are supported by a pair of end walls 12 via bearings 14 so as to be rotatable and displaceable in the axial direction. Seals 16 are arranged between the end wall 12 and the rotor shaft 10 at positions closer to the rotor 8 than the bearings 14. These seals 16 keep the side chambers 18 and 20 airtight. Although not shown, one end of the rotor shaft 10 is connected to a driving source, and the driving source rotates the rotor 8 in one direction at a constant speed.

As is clear from FIGS. 1 and 2, the rotor 8
Has a tapered shape and has a plurality of pockets 2 on its outer peripheral surface.
2 are formed. These pockets 22 are attached to the rotor 8
Are arranged at intervals in the circumferential direction. Further, a plurality of vane seals 24 are attached to the outer peripheral surface of the rotor 8, and these vane seals 24 are arranged between the pockets 22.

A liner 26 is attached to the inner surface of the housing body 3, and each vane seal 24 moves while sliding on the liner 26 as the rotor 8 rotates. On the other hand, a pair of side seals 28 are respectively attached to the small-diameter end and the large-diameter end of the rotor 8, and these side seals 28 are air-tightly connected to both ends of each vane seal 24, and Accordingly, the housing body 3
While sliding in airtight contact with the liner 26. Therefore,
Each pocket 22 of the rotor 8 is more airtightly partitioned than the vane seal 24, the liner 26 and the side seal 28.

The above-mentioned side chambers 18 and 20 are respectively connected to pressure sources through pressurizing passages 19 extending inside the rotor housing 2. Therefore, the side chambers 18 and 20 can receive the supply of pressure from the pressure source. Here, the pressure in the side chambers 18 and 20 is set to the maximum pressure supplied to the pocket 22. The large diameter end of the rotor 8 has a larger effective pressure receiving area than the small diameter end,
Therefore, the pressure inside the pair of side chambers 18 and 20 is
Is applied to the small-diameter end and the large-diameter end, the rotor 8 receives a force toward the small-diameter end. Therefore, even if the vane seals 24 and the side seals 28 are worn, the rotor 8 is displaced to the small diameter end side, so that the sealing performance of the seals 24 and 28 can be maintained.

Further, since the side seal 28 also receives the pressure in the side chambers 18 and 20, the pressure in the pocket 22 does not escape to the side chambers 18 and 20. As is clear from FIG. 3, for example, twelve pockets 22 are provided on the outer peripheral surface of the rotor 8. Therefore, in this case, these pockets 22 are arranged on the outer peripheral surface of the rotor 8 at intervals of 30 °.

The shape of the rotor housing 2 shown in FIG. 3 is different from that shown in FIG. 1, but this is merely for the convenience of drawing. That is, the outer shape of the rotor housing 2 can be arbitrarily set, and the rotor housing 2 only needs to have a tapered rotor bore in which the rotor 8 is rotatably accommodated. As shown in FIG. 3, the inlet 4 and the outlet 6 of the rotor housing 2
Are diametrically spaced apart from each other. In this embodiment, the entrance 4
Is connected to a high-pressure vessel (not shown), and its outlet 6 is open to the atmosphere. In this case, the rotor 8 is rotated clockwise as indicated by the arrow in FIG.

In the rotor housing 2, two first communication ports 30 and 32 and one pressure regulating port 34 are sequentially formed between the inlet 4 and the outlet 6 when viewed in the rotation direction of the rotor 8. Between exit 6 and entrance 4
Second communication ports 36 and 38 and one pressure regulating port 4
0 are sequentially formed. One end of each of the communication port and the pressure adjustment port is open to the inner surface of the rotor housing 2, that is, the liner 26.

The distance between the open end of the first communication port 30 and the open end of the first communication port 32 and the distance between the open end of the first communication port 32 and the open end of the pressure regulating port 34 when viewed in the rotation direction of the rotor 8. The distance between the vane seal 24 and the distance between the open end of the second communication port 36 and the open end of the second communication port 38 and the distance between the open end of the second communication port 38 and the open end of the pressure adjustment port 40 It is set equal to the interval.

That is, when viewed in the rotation direction of the rotor 8, the inlet 4
, The ports 30, 32, and 34 on the pressure reducing side in the circumferential direction of the rotor 8
It is arranged at intervals of 0 ° and has an exit 6
Ports 36, 3 on the boost side located between
8 and 40 are also arranged at intervals of 30 ° in the circumferential direction of the rotor 8.

Therefore, during rotation of the rotor 8, each pocket 2
2 is not connected to two ports adjacent to each other in the circumferential direction of the rotor 8 at the same time. Ports 30 and 32 on the decompression side
Numerals 34 are arranged symmetrically on both sides of a vertical plane connecting the inlet 4 and the outlet 6 of the rotor housing 2 with respect to the ports 36, 38, 40 on the boost side. However, the ports 30, 32, 34 on the pressure reducing side and the ports 36, 38, 4 on the pressure increasing side
0 is not symmetrically arranged with respect to a horizontal plane including the axis of the rotor 8.

That is, as shown in FIG. 3, the first communication port 32 and the second communication port 38 are deviated from the horizontal plane by a predetermined angle α (for example, 5 °) toward the outlet 6 side. I have. Therefore, the ports 30, 32,
When each of the ports 34 is closed by the vane seal 24 of the rotor 8, the ports 36, 38, and 40 on the boost side are in a state of being connected to the corresponding pocket 22, respectively.

This means that with respect to the rotation angle of the rotor 8, each of the ports 30, 32, 34 on the pressure reducing side and the pocket 2
2 is different from the rotational angle position of the rotor 8 at which the boost ports 36, 38, and 40 and the pocket 22 are connected to each other. . 3, the first communication port 30 and the second communication port 38 are connected to each other by a pressure equalizing pipe 42, and the first communication port 32 and the The two communication ports 36 are also connected to each other by an equalizing tube 44. The pressure regulating port 40 located on the inlet 4 side is connected to a high-pressure vessel via a connection pipe 46, while the pressure regulating port 34 located on the outlet 6 side has the same pressure as the pressure of the inlet 4. Through a connection pipe 48. Although not shown, the recovery tank is connected to a high-pressure vessel via a booster.

The aforementioned ports 30, 32, 34, 36,
Each of the pressure equalizing tubes 42, 38 is provided in pairs, as is apparent from FIGS.
Each of the 44 is also provided in a pair. In addition,
Each port is separated from each other in the axial direction of the rotor 8 and can communicate with each pocket 22. As shown by a broken line in FIG. A passage 5 is formed.

As shown in FIGS. 1 to 3, screen units 50 are respectively attached to the open ends of the first communication port, the second communication port, and the pressure adjustment port. Since the opening end of each communication port and the screen unit 50 thereof have the same shape and structure, the first communication port 30 and the screen unit 50 thereof will be described below with reference to FIGS. I will explain it.

FIG. 4 is an enlarged view of the periphery of one screen unit 50 in FIG. 2, and FIG. 5 is a sectional view of the screen unit 50. As is clear from FIG. 4, the open end of the first communication port 30 is not circular,
The screen unit 50 extends in the axial direction of the rotor 8, and the screen unit 50 is fitted in the opening end. The screen unit 50 has a screen filter 52 exposed toward the inside of the rotor housing 2, and the screen filter 52 is integrally welded and fixed to a lower surface of the holder 54. The holder 54 is pressed by a holding plate 58 via a seal 56, and the holding plate 58 is fixed to the liner 26 via a plurality of mounting bolts 60.

The screen filter 52 is made of a cemented carbide, and as shown in FIG. 6, has a slender plate shape with both ends in a semicircular shape. Screen filter 52
Has a number of filter regions 62 and these filter regions 6
And a partition area 64 for partitioning the area 2. The filter areas 62 are arranged in three rows, each row extending in the longitudinal direction of the screen filter 52, and a large number of through holes 66 are formed in each filter area 62. In FIG.
6 is shown in only one filter region 62, the details of which are shown enlarged in FIG.

As is apparent from FIG.
The two through holes 66 are arranged in two rows, and the diameter of each through hole 66 is set smaller than the material to be handled. As described above, the screen filter 52 has a number of filter regions 62, and each filter region 6
Since a large number of through-holes 66 are formed in 2, a mesh structure is formed as a whole.

However, since the partition area 64 exists between each filter area 62 and the adjacent filter area 62, the through-hole 66 of each filter area 62 and the through-hole 66 of the adjacent filter area 62 There is a sufficient distance between them. As is clear from FIG. 8, on the lower surface of the holder 54 of the filter screen 52, a large number of connection holes 68 having the same shape are formed and opened at positions corresponding to the respective filter regions 62. 68
Is connected to the first communication port 30 through the collecting hole 70.

As shown exaggeratedly in FIG. 8, the outer surface of the filter screen 52 is formed in an arc surface that matches the curvature of the inner surface of the liner 26, and thus the rotor 8
The vane seal 24 moves while slidingly contacting the filter screen 52. Next, the operation of the above-described rotary valve will be described. As shown in FIG. 3, when the pressure in the high-pressure vessel is a gauge pressure PH, the pressure PH is always supplied to the inlet 4 and the outlet 6 is open to the atmosphere. The pressure of 6 is always a gauge pressure of 0. Therefore, the internal pressure of the pocket 22 connected to the inlet 4 becomes PH, while the pocket 2 connected to the outlet 6
2 has an internal pressure of 0.

The rotary valve has two equalizing tubes 42, 4
Since the rotor 4 is provided, the pocket 22 from the inlet 4 to the outlet 6 is communicated with the pocket 22 from the outlet 6 to the inlet 4 through the corresponding pressure equalizing pipe and the communication port with the rotation of the rotor 8, and this communication is performed. At this point, the pressure in both pockets 22 becomes uniform. Therefore, the internal pressure of the pocket 22 moving from the inlet 4 toward the outlet 6 is gradually reduced, while the internal pressure of the pocket 22 moving from the outlet 6 toward the inlet 4 is gradually increased. Will be done.

The rotation angle position of the rotor 8 in which each of the pressure reducing ports 30, 32, and 34 is connected to the pocket 22, and the rotation angle position of the rotor 8 in which each of the pressure increasing ports 36, 38, and 40 are connected to the pocket 22. Since the rotation angle position is different from the rotation angle position as described above, the pocket 22 on the decompression side that moves from the inlet 4 toward the outlet 6 with the rotation of the rotor 8.
Is subjected to two decompression operations per one pressure equalizing tube, and conversely, the pressurizing side pocket 22 moving from the outlet 6 toward the inlet 4 performs two pressure increasing operations per one pressure equalizing tube. receive.

That is, with the rotation of the rotor 8, the pressure reducing side pocket 22 communicates with the two pressure increasing side pockets 22 through the same pressure equalizing tube, while the pressure increasing side pocket 22 similarly has the same equalizing amount. It communicates with the two pockets 22 on the reduced pressure side through a pressure tube. The pressure reducing side pocket 22 is connected to the pressure regulating port 34 before being connected to the outlet 6, and the pressure increasing side pocket 22 is connected to the pressure regulating port 40 before being connected to the inlet 4.
Connected to.

Accordingly, in the case of the rotary valve of this embodiment, since the two equalizing tubes 42 and 44 are provided, the pocket 22 on the pressure reducing side is a total of five times from the inlet 4 to the outlet 6. And the pocket 22 on the pressurizing side also reaches the inlet 4 from the outlet 6,
It receives a total of 5 pressurizing actions. That is, each pocket 22 on the decompression side is depressurized through five depressurization steps, while each pocket 22 on the boost side is depressurized through five pressurization steps.

Therefore, immediately before the pressure-reducing side pocket 22 is connected to the pressure adjusting port 34, the internal pressure of the pocket 22 is reduced to 1/5 of the pressure PH at the inlet 4. Are the pressure adjustment port 34 and the connection pipe 46
When connected to the collection tank via the, the internal pressure is reduced to the atmospheric pressure equal to the pressure at the outlet 6. On the other hand, immediately before the booster side pocket 22 is connected to the pressure adjustment port 40, the internal pressure of the pocket 22 is increased from 0 to 4PH / 5. When connected to the high pressure vessel through the pipe 46, the internal pressure is increased from 4PH / 5 to PH equal to the pressure in the high pressure vessel.

According to the above-described rotary valve, when the raw material in the high-pressure container is introduced into the inlet 4 of the rotor housing 2, the raw material is received in the pocket 22 connected to the inlet 4 as the rotor 8 rotates. . Here, since the pocket 22 connected to the inlet 4 has an internal pressure equal to the pressure in the high-pressure container, the supply of the raw material from the inlet 4 to the pocket 22 is performed smoothly.

The raw material received in the pockets 22 is conveyed toward the outlet 6 with the rotation of the rotor 8, and in this conveying process, the pressure in each pocket 22 is reduced stepwise as described above, and Just before the pressure reaches the atmospheric pressure equal to the pressure at the outlet 6. Therefore, when the pocket 22 receiving the raw material is connected to the outlet 6, the raw material is
From 2 through an outlet 6, it is discharged from the rotary valve by its own weight.

The empty pocket 22 that has passed through the exit 6
Moves toward the inlet 4, during which the internal pressure is increased stepwise to the pressure in the high-pressure vessel, and is connected again to the inlet 4. As a result, if such a rotary valve is used, the material in the high-pressure vessel can be continuously discharged while sealing the inside of the high-pressure vessel with pressure.

When the above-described rotary valve is used for discharging the raw material from the high-pressure vessel, the pocket 22 on the pressure reduction side from the inlet 4 to the outlet 6 is provided with the first communication ports 30 and 32.
Each time it is connected to the pressure regulating port 34, the gas in the pocket 22 tends to be discharged toward the port together with the gas flow since the gas inside the pocket 22 flows out through these ports. However, the first communication port 3
As described above, the screen units 50 are arranged at the open ends of the pressure adjustment ports 34 and 0, 32, respectively. Therefore, the discharge of the raw material from the pockets 22 to the ports is prevented by the screen filter 52 of the screen unit 50. . Since the screen units 50 are also arranged at the open ends of the second communication ports 36 and 38 and the pressure regulating port 40, even if the raw materials are discharged to the pressure equalizing pipes 42 and 44, the raw materials are discharged from the second equalizing tubes 42 and 44. The pockets 22 on the pressurizing side do not intrude from the communication ports 36 and 38, and the residual raw material in the pockets 22 is removed
It is not discharged through zero.

During the rotation of the rotor 8, each vane seal 24 of the rotor 8 slides against the screen filter 52 of the unit 50. Therefore, if hard foreign matter is mixed in the raw material in the pocket 22, the foreign matter is removed. Vane seal 24
And the screen filter 52. Entrapment of foreign matter causes a crack in the screen filter 52 in a weak portion thereof, that is, between the through holes 66 in the filter region 62.

The cracks thus generated tend to grow while propagating to the adjacent through holes 66, but this growth stays in the fill region 62 and does not reach the adjacent filter region 62. . That is, since the filter region 62 is surrounded by the partition region 64 in which no through hole exists, crack growth is prevented by the partition region 64.

Accordingly, the above-described screen filter 52
According to this, even if a small crack is generated, the crack does not grow over the entire area of the screen filter 52, so that the screen filter 52 can be used for a long time.
As a result, the period of maintenance and inspection of the rotary valve is lengthened, and the operation rate can be improved. In addition, the opening ends of the communication ports and the pressure adjusting ports, and the screen filters 52 thereof are not circular but extend in the axial direction of the rotor 8, so that a large opening area of the screen filters 52 can be secured. Therefore, even if the capacity of the pockets 22 of the rotor 8 is increased in order to improve the raw material processing capacity of the rotary valve, the time required for the equalizing operation between the pressure reducing side and the pressure increasing side pockets can be reduced.

Further, the screen filter 52 is
Even if it is long in the axial direction, the processing does not become difficult, and the vane seals 2 for the communication port and the pressure regulating port are formed.
4 can sufficiently secure the sealing ability. The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, referring to FIG.
A modification applied to the communication port 30 is shown. In this case, the first communication port 30 is connected to the screen unit 50.
Side portion is branched into two branches, and these branch portions 30
a and 30b are connected to the screen unit 50. According to the modification of FIG. 9, raw material debris passes through the through-hole 62 of the screen filter 52, and the debris accumulates.
Even if clogging occurs in one branch portion, the pressure equalizing operation can be performed using the other branch portion.

The rotary valve of one embodiment is used for discharging the raw material from the high-pressure container, but can also be used for supplying the raw material from the atmosphere side to the high-pressure container. Furthermore,
According to the rotary valve of one embodiment, the equalizing operation of each pocket is performed twice for the same equalizing pipe. However, the equalizing operation of each pocket is performed once by the same equalizing pipe as in the conventional rotary valve. May be performed only.

[0049]

As described above, according to the rotary valve of the present invention, the screen filters provided at the opening ends of the first and communication ports are provided with a plurality of filter regions in which through holes are distributed, and between the filter regions. Because of the partitioning area, even if a crack is generated in one filter area due to foreign matter being caught, the crack does not grow to another filter area, and the screen filter has a longer life. Can be. As a result, the number and frequency of maintenance and inspection of the rotary valve can be reduced, and the operating rate of the rotary valve can be improved. Further, since the opening end of the communication port and the screen filter are not circular but extend in the axial direction of the rotor, a large opening area of the screen filter can be secured without making the processing difficult, and the rotary valve can be enlarged. It is also suitable for. Further, when the communication port is branched into a plurality of ports and connected to the screen filter, there is an advantage that even if a clogging occurs at one branching portion, a pressure equalizing operation can be performed through the other branching portion. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rotary valve according to an embodiment, partially cut away.

FIG. 2 is a longitudinal sectional view of a part of the rotary valve of FIG. 1;

FIG. 3 is a cross-sectional view of the rotary valve of FIG.

FIG. 4 is an enlarged view showing a periphery of a screen unit in FIG.

FIG. 5 is a sectional view taken along line VV in FIG.

FIG. 6 is a front view of the screen filter.

FIG. 7 is an enlarged front view showing one filter area of the screen filter.

FIG. 8 is a sectional view of a screen unit.

FIG. 9 is a partial cross-sectional view of a rotary valve showing a modification of the communication port.

[Explanation of symbols]

 Reference Signs List 2 rotor housing 4 inlet 6 outlet 8 rotor 22 pocket 24 vane seal 26 liner 30, 32 first communication port 36, 38 second communication port 42, 44 pressure equalizing tube 50 screen unit 52 screen filter 62 filter area 64 partition area 66 through hole 30a , 30b Branch (communication port)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuo Nemoto, Inventor, Tomobe Plant, 1966-6, Tomobe-cho, Tomobe-cho, Nishi-Ibaraki-gun, Ibaraki Pref. Mitsubishi Heavy Industries, Ltd. (72) Inventor Yoshiharu Arai 12, Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. (72) Inventor Taketoshi Shiraishi 12, Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Heavy Industries, Ltd. (56) References JP-A-6-221449 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65G 53/00-53/28 B65G 53/32- 53/66 B65G 65/30-65/48

Claims (3)

(57) [Claims] A rotor housing having an inlet and an outlet, and having different pressures supplied to the inlet and the outlet; a rotor housed in the rotor housing; a rotor formed in a circumferential direction on an outer peripheral surface of the rotor; Along with the rotation, a plurality of pockets sequentially communicating with the inlet and the outlet, open in the inner peripheral surface of the rotor housing between the inlet and the outlet, as viewed in the direction of rotation of the rotor, the pocket with the rotation of the rotor A plurality of first communication ports that are sequentially connected, and a plurality of first communication ports that are opened in the inner peripheral surface of the rotor housing between the outlet and the inlet when viewed in the rotation direction of the rotor, and that are sequentially connected to pockets as the rotor rotates. And a plurality of pressure equalizing tubes connecting between the first communication port and the corresponding second communication port, and a pocket that passes through the inlet and goes to the outlet as the rotor rotates. A rotary filter for gradually changing the pressure in the port to the same pressure as that of the outlet by the equalizing pipe, wherein the rotor is slidably contacted with the openings of the first and second communication ports. Wherein the screen filter includes a plurality of filter regions in which through holes are distributed, and a partition region separating adjacent filter regions. 2. The rotary valve according to claim 1, wherein the openings of the first and second communication ports and the screen filter extend in an axial direction of the rotor. 3. The communication port is branched into a plurality of ports,
The rotary valve according to claim 1, wherein the rotary valve is connected to a filter area of the screen filter.