JP2013255870A - Sealing mechanism of rotation processing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a sealing characteristic of a ring-shaped sealing member which is used when the sealing member seals a gap between an opening of a casing serving as a pressure vessel and a connection portion of a rotation processing mechanism extending through the opening.SOLUTION: A sealing member has three-layer structure in which a layer of a fluorine-base resin material, a layer of a rubber-base resin material and a base fabric of a nylon-base material are laminated in order from a side being in contact with an internal atmosphere of a casing. A cross sectional shape of the sealing member is designed to have a convexly curved center portion and both end portions in each of which at least two projection parts held between the casing and a clamping means of a connection portion are formed. By adopting this sealing member, a sealing characteristic at an opening of the casing where a connection portion of a rotation processing mechanism is arranged can be enhanced. In addition, degradation of the sealing characteristic due to any shake (vibration) which may occur during rotational movement of the casing can be suppressed.

Description

  The present invention relates to a rotation processing device such as a centrifuge.

  For example, a decanter type centrifuge disclosed in Patent Document 1 is a rotation processing device that performs a separation operation by applying a centrifugal force to a liquid to be processed. In the centrifuge, a bowl as a rotating body and a screw conveyor are arranged in a casing, and a driving mechanism (for example, a driving motor) for rotating the bowl is arranged outside the casing. The screw conveyor receives the power of the drive motor via a gear box, which is a differential speed generating device, and rotates with a relative differential speed between the screw conveyor and the bowl. The shaft serving as the rotation axis of the bowl is pivotally supported by a connecting portion that passes through the opening of the casing, and is configured such that the power of the drive motor is transmitted to the end of the shaft that extends to the outside of the casing. . The connecting portion includes a bearing mechanism such as a bearing and a seal mechanism such as a gland packing.

  The casing has an airtight structure so that impurities are not mixed. In particular, when the processed product is a chemical or a food, it is necessary to keep the casing airtight as much as possible in order to prevent contamination of the casing or leakage of the chemical or the like. Therefore, also in patent document 1, the mechanical seal which improved the sealing characteristic is reported. The mechanical seal reported in Patent Document 1 is applied to a gear box. On the other hand, a flat and ring-shaped sealing member formed of a resin-based material is generally used for a sealing mechanism that seals a gap between the opening of the casing and the connecting portion. The seal member is sandwiched between the inner peripheral area (clamped part) by the clamping means (clamping means) of the connecting part, and the outer peripheral area (clamped part) is clamped by the clamping means (clamping means) of the casing. The The clamping means needs to clamp the sealing member with a necessary pressure corresponding to the casing internal pressure. Generally, the clamping means is structured to be tightened with a bolt or a screw mechanism, and the bolt or the like is tightened with a necessary torque.

JP 2012-7634 A

  However, the sealing member that seals the gap between the opening and the connecting portion of the casing has a problem that the sealing characteristics are not always sufficient. In particular, when the operating conditions are set to high pressure (for example, 0.6 MPa or more), leakage due to defective pressure resistance may occur. Furthermore, in a device having a rotator, the rotator moves eccentrically with respect to the casing during rotation, so that the means for clamping the clamp portion may be loosened, and the sealing characteristics may deteriorate. In the case of a bowl-shaped decanter as in Patent Document 1, the bowl, which is a rotating body, is suspended and supported, so that the vibration (vibration) generated during the rotation operation often causes the sealing characteristics to deteriorate.

  Further, the conventional seal member has a problem that the surface pressure to be clamped is high and a high torque is required for tightening bolts or the like. When the surface pressure is high, there are many problems that mounting failure or loosening of bolts or the like is often caused, and there is a problem that the mounting operation to the apparatus is not easy.

  The present invention has been made in order to solve the above-mentioned problems mentioned as an example, and the object thereof is a gap between an opening of a casing forming a pressure vessel and a connecting portion of a rotation processing mechanism passing through the opening. In sealing with a ring-shaped sealing member, the present invention is to provide a technique capable of enhancing the sealing characteristics of the sealing member.

  Another object of the present invention is to provide a technique capable of suppressing the deterioration of the sealing characteristics of the sealing member due to the rotating operation of the rotating body.

  Another object of the present invention is to provide a technique capable of facilitating attachment of a seal member to an apparatus.

(1) A rotation processing apparatus according to the present invention includes a casing forming a pressure vessel, a rotating body that rotates within the casing, a driving device that rotates the rotating body disposed outside the casing, and an opening of the casing. A rotation processing mechanism including a connecting portion that penetrates and connects the rotating body and the driving device; and a ring-shaped seal member that seals a gap between the opening of the casing and the connecting portion located in the opening; The sealing member includes three layers in which a layer of a fluorine-based resin material, a layer of a rubber-based resin material, and a base material of a nylon-based material are stacked in this order from the side in contact with the internal atmosphere of the casing. The structure and the cross-sectional shape of the sealing member are a central portion that is curved in a mountain shape that is disposed in the gap between the casing and the connecting portion, and the clamping means for the casing and the connecting portion. Characterized in that it comprises a clamped portion at both ends projecting portions of at least two crests are formed is lifting.
(2) The at least two convex portions are preferably formed on both the front surface and the back surface of the seal member.
(3) The opening is formed on the upper side of the casing, and the rotating body is suspended and supported by a connecting portion.
(4) The rotating body includes a rotating bowl and a screw conveyor that separate solids and liquids by the action of centrifugal force, and the rotation processing device is a decanter type centrifuge.

  According to the rotation processing apparatus of the present invention, it has a three-layer structure in which a layer of a fluorine-based resin material, a layer of a rubber-based resin material, a base material of a nylon-based material are stacked in order from the side in contact with the internal atmosphere of the casing, By adopting a seal member designed to have a cross-sectional shape including a central portion curved in a chevron shape and at least two convex portions sandwiched between the casing and the clamping means of the connecting portion, rotation is achieved. It is possible to enhance the sealing characteristic of the opening of the casing in which the connection part of the processing mechanism is arranged, and to further suppress the sealing characteristic from being deteriorated due to the vibration (vibration) generated during the rotation operation.

  Therefore, the rotation processing apparatus of the present invention can be applied to a technical field where it is desired to avoid contamination of chemical, food, bio-related impurities. Further, it is possible to cope with an operating condition in which the pressure in the casing is set to a high pressure, and it is possible to realize a safe operation in which contents are prevented from leaking.

  Furthermore, according to the rotation processing apparatus of the present invention, the use of the sealing member having the above-described configuration can reduce the surface pressure of the portion sandwiched between the clamping means, so that mounting failure, loosening of bolts, etc. can be prevented. It is less likely to occur and can be easily attached to the device. Furthermore, since the diameter of the seal member can be reduced, the attachment to the apparatus becomes easier.

It is a block diagram of the decanter by preferable embodiment of this invention. It is a figure which shows the attachment position of the sealing member which the said decanter employ | adopted. It is a perspective view of the said sealing member. It is sectional drawing of the said sealing member. It is a schematic diagram which shows a mode that the said sealing member is clamped. It is a figure explaining the result of the Example performed in order to confirm the effect of this invention.

  Hereinafter, a decanter centrifuge will be described as an example of the rotation processing device according to a preferred embodiment of the present invention. However, the technical scope of the present invention is not construed as being limited by the embodiments described below.

  FIG. 1 shows the overall configuration of the centrifuge according to the present embodiment. FIG. 1 shows a saddle type decanter 1 as an example of a centrifuge. The decanter 1 includes a bowl 2 that is a rotating body. The bowl 2 is a generally cylindrical rotating body in which the liquid to be processed is supplied, and applies a centrifugal force for solid-liquid separation to the liquid to be processed. The bowl 2 is disposed in a casing 3 that is an exterior body, and can be rotated around a vertical axis by a drive motor 31 as a drive device disposed outside the casing 3.

  A disk member 21 called a front hub is disposed on the upper side of the bowl 2, and a discharge port (separation liquid discharge port) 21 a through which the separation liquid is discharged is formed in the disk member 21. On the other hand, a discharge port (solid discharge port) 22 through which the separated solid matter is discharged is formed on the lower side of the bowl 2. The shaft 21b serving as the rotation axis of the bowl 2 is pivotally supported by a connecting portion 21c penetrating the upper opening of the casing 3, and the power of the drive motor 31 is attached to the end of the shaft 21b extending to the outside of the casing 3. Is transmitted. A bearing mechanism 21d such as a bearing and a rotary shaft seal mechanism 21e such as a gland packing are disposed inside the connecting portion 21c. The driving force of the driving motor 31 is transmitted to the pulley 34 on the bowl 2 side through, for example, an endless rotating belt 33 spanned around the pulley 32. However, the driving force transmission method is not limited. In the present embodiment, the rotation processing mechanism is configured by the bowl 2, the connecting portion 21c, and the drive motor 31, but is not limited to these configurations.

  Inside the bowl 2, a screw conveyor 4 that conveys the solid material toward the solid material discharge port 22 is disposed. The screw conveyor 4 rotates at a differential speed with respect to the rotation speed of the bowl 2, and conveys solids toward the solid discharge port 22 by screw blades 41 formed in a spiral shape. Therefore, the bowl 2 and the screw conveyor 4 are connected to the gear box 5 which is a differential speed generating device. When the bowl 2 is rotated by the drive motor 31, the rotation speed is changed through the gear box 5, and the screw conveyor 5 is moved to the bowl 2 The rotation speed is different from that of the rotation speed. On the other hand, the liquid to be treated is continuously supplied into the bowl 2 through the supply nozzle 23, and the separated liquid from which the solid matter is separated is discharged from the discharge port 21a (so-called overflow). The separated liquid discharged from the bowl 2 is supplied to a bowl-shaped liquid receiving part 35 formed on the inner peripheral surface of the casing 3, and further discharged to the outside of the apparatus through a discharge nozzle 36 communicating with the liquid receiving part 35. The

  The lower ends of the bowl 2 and the screw conveyor 4 are open, and the tip 23a of the supply nozzle 23 is inserted into the opening so as not to contact the rotating bowl 2 and the screw conveyor 4. Then, when the liquid to be processed is supplied to the cavity (buffer) formed inside the screw conveyor 4, the liquid to be processed is caused by the action of centrifugal force through the liquid discharge hole 42 formed in the body portion of the screw conveyor 4. It is fed into the bowl 2. Further, the tip 23 a of the supply nozzle 23 is formed of a double pipe, and the outer pipe communicates with the rinse liquid supply nozzle 24. The rinsing liquid can be supplied into the bowl 2 to wash the separated solids, for example. However, a rinse solution is not always necessary.

  As described above, the screw conveyor 4 rotates with a differential speed relative to the rotation speed of the bowl 2. This “rotation with a relative differential speed” includes not only the case of rotating at a speed slower than the rotation speed of the bowl 2 but also the case of rotating at a speed higher than the rotation speed of the bowl 2. As a method of forming such a differential speed, there is a method of designing the gear box 5 to a gear ratio that forms a desired differential speed, or arranging a back drive motor to apply a brake torque to the screw conveyor 4. is there. FIG. 1 shows a decanter 1 of a type that forms a differential speed only by the gear ratio of the gear box 5 without using a back drive motor. Since the gear box 5 is known as disclosed in, for example, Patent Document 1 and the like, detailed description thereof is omitted.

  Next, the sealing member according to the present embodiment will be described with reference to FIGS. FIG. 2 is an enlarged view of a place (A in FIG. 1) where the seal member is disposed. FIG. 3 is a perspective view of the seal member, and FIG. 4 is a cross-sectional view. FIG. 5 is a schematic diagram showing how the sealing member is clamped.

  As shown in FIG. 2, the seal member 6 is disposed so as to seal the gap 100 between the casing 3 and the connecting portion 21c. The gap 100 is about 10 mm, for example. More specifically, the sealing member 6 is disposed so as to close the gap 100 between the casing 3 and the connecting portion 21c, and the region on the inner peripheral edge side (clamped portion) of the sealing member 6 is disposed on the connecting portion 21c side over the entire circumference. It fixes with a clamp means and the area | region (clamped part) by the side of an outer periphery is fixed by the clamp means by the side of the casing 3 over the perimeter. In FIG. 2, as an example of clamping means, the sealing member 6 is sandwiched between members 60 and 61 having strength (for example, metal ring-shaped members), and tightening pressure is applied by tightening means 62 and 63 such as bolts and screws. The structure which clamped the sealing member 6 by providing is shown. The pressure is appropriately changed depending on the material of the seal member 6 and the operating conditions of the apparatus. As an example, a tightening pressure is applied so that the tightening torque of bolts or the like is 8.6 Nm × 6.

  Next, the shape and the like of the seal member 6 will be described in detail. As shown in FIG. 3, the seal member 6 is formed in a circular ring shape. The dimension of the seal member 6 can be appropriately set depending on the size of the device to be attached. As an example, the inner diameter can be about 290 mm, the outer diameter can be about 350 mm, and the thickness can be about 6 mm. Furthermore, the shape is not limited to a circle, and various shapes such as a rectangular shape and an oval shape can be used. In other words, the shape of the seal member 6 can be appropriately determined according to the shape of the opening of the casing 3 and / or the shape of the connecting portion 21c.

  Further, the cross-sectional shape of the seal member 6 (BB cross-section in FIG. 3) will be described. As shown in FIG. 4, a portion 64 that is curved in a mountain shape upward is formed at the center. Regions (clamped portions) 65 and 66 sandwiched by the clamping means of the casing 3 and the connecting portion 21 are formed at both ends of the portion 64 (that is, both the inner peripheral edge side and the outer peripheral edge side). The sealing member 6 has a mountain-shaped central portion 64 disposed in a gap between the casing 3 and the connecting portion 21c. Therefore, even when the connecting portion 21c causes an eccentric motion due to shaking or the like when the bowl 2 is rotated, the eccentric movement can be absorbed by the deformation of the mountain-shaped portion 64. As an example, the angle R of the mountain shape can be set to 6 mm on the outer peripheral side and 2 mm on the inner peripheral side.

  Two convex portions 65a, 65b, 66a, 66b are formed in regions (clamped portions) 65, 66 at both ends of the seal member 6 with a gap in the radial direction. Each of the convex portions 65a, 65b, 66a, 66b is preferably formed in a ring shape over the entire circumference of the seal member 6 (see FIG. 3). Here, the sealing member 6 including an incompressible elastic material generates a repulsive force proportional to the contact area with respect to the compressive force. Therefore, when the clamped parts 66 and 67 are flat or substantially flat, the compression force due to the fastening of the fixing means is dispersed, and a high tightening torque may be required to obtain a required surface pressure. On the other hand, when the convex portion is a single mountain, the contact area with the clamping means is smaller than that of the flat portion, and sealing characteristics are exhibited by generating a high repulsive force with a small compressive force. On the other hand, in the case of a single mountain, since the inside (encapsulation side) and the outside of the casing 3 are partitioned only by the line contact of the convex portion of the mountain, the displacement of the mounting position that occurs during vibration transmission or sudden pressure reduction. It is difficult to follow this and stable sealing characteristics cannot be obtained. On the other hand, when the convex portions 65a and 65b and the two peaks formed by 66a and 66b are used, the contact area is small, and a high repulsive force is generated to obtain a high sealing characteristic. In addition, in the case of two mountains, a space (valley part) between the mountains acts as an intermediate chamber, and the sealed state can be maintained even if the attachment position is displaced. In other words, the sealing state can be kept stable by using two peaks. Furthermore, since the sealing member 6 can exhibit high sealing characteristics with a small compressive force, the tightening torque can be set low. Furthermore, it is possible to reduce the diameter of the seal member 6 (that is, set the widths of the clamped portions 65 and 66 to be small). The convex portions 65a, 65b, 66a, 66b are preferably two mountains in consideration of the manufacturing cost of the seal member 6 or the like, but may be three or more mountains.

  The convex portions 65a, 65b, 66a, 66b are preferably formed on both the front and back surfaces of the clamped portions 65, 66. The height and width of the convex portions 65a, 65b, 66a, 66b are not particularly limited, but are preferably set to a height corresponding to a crushing allowance when clamped. The height (namely, crushing allowance L1) of convex part 65a, 65b, 66a, 66b can be set to 2 mm as a preferable example.

  The seal member 6 has a three-layer structure including a lower layer 67 formed of a fluorine-based resin, an intermediate layer 68 formed of a rubber-based resin, and a base fabric (that is, an upper layer) 69 formed of a nylon-based material. The members 67, 68, and 69 constituting these three layers are not simply stacked on each other, but the members 67, 68, and 69 constituting these three layers in the process of manufacturing the seal member 6 are bonded with adhesives or welds. It is preferable to use a single body fixed by a method such as the above. However, the fixing means is not limited.

  For example, PTFE can be used as the fluororesin. Since the lower layer 67 is also a surface in contact with the internal atmosphere of the casing 3, it is preferable to select one having corrosion resistance with respect to the internal atmosphere of the casing 3 (that is, the processed product of the apparatus). Further, for example, FKM, NBR, or the like can be used for the rubber-based resin of the intermediate layer 68. For example, nylon 6 or polypropylene can be used as the nylon material constituting the base fabric (cloth-like member) 69.

  The thickness of each layer 67, 68, 69 can be set as appropriate. As an example, the lower layer 67 formed of a fluorine-based resin is 0.8 mm, the intermediate layer 68 formed of a rubber-based resin is 3 mm, and the base fabric (that is, the upper layer) 69 formed of a nylon-based material is 0.3 mm. Can be.

  On the other hand, as shown in FIG. 5, the clamping means has opposed surfaces 60a and 61a sandwiching the clamped portions 65 and 66 as flat surfaces, and is engaged with the skirt portions of the convex portions 65b and 66b inside the seal member 6. It is preferable to have the convex portions 60b and 61b protruding so as to match. Similarly to the convex portions 65b and 66b of the seal member 6, the convex portions 60b and 61b of the clamping means are preferably formed on the entire circumference along the inner circumference of the casing 3 and the outer circumference of the connecting portion.

  As schematically shown in FIG. 5, the sealing member 6 configured as described above sandwiches clamped portions 65 and 66 at both ends by metal members 60 and 61 as clamping means, and further tightens means such as bolts ( By clamping with a predetermined tightening torque with reference numerals 62 and 63) in FIG. 2, the two convex portions 65a, 65b, 66a, and 66b of the clamped portions 65 and 66 are deformed (crushed), and the target pressure is obtained. The sealing property that can withstand the pressure is developed. As described above, in the seal member 6 according to the present embodiment, the two convex portions 65a, 65b, 66a, 66b set to a height corresponding to the crushing allowance contact / deform the flat surfaces 60a, 61a of the clamping means. Therefore, the surface pressure can be lowered by that amount. FIG. 5 schematically shows the state of deformation, and is not necessarily limited to the deformation state shown in the figure. However, when the peaks and valleys are completely crushed, there is no space to act as an intermediate chamber, and it becomes impossible to cope with the positional deviation. Furthermore, by having the convex portions 60b and 61b protruding so as to engage the skirt portions of the convex portions 65b and 66b on the inner side of the seal member 6 so that the shape of the clamping means matches the shape of the seal member 6, The sealing member 6 having a reduced diameter can be reliably clamped to ensure sealing characteristics.

  As described above, according to the decanter 1 according to the above-described embodiment, the lower layer 67 formed of a fluorine-based resin, the intermediate layer 68 formed of a rubber-based resin, and the base fabric (that is, the upper layer) 69 formed of a nylon-based material. And having a section 64 formed in a central chevron and a clamped portion 65, 66 at both ends formed with two convex portions 65a, 65b, 66a, 66b. By adopting the seal member 6, it is possible to reduce the total contact area with the clamping means, to secure a necessary surface pressure with a small tightening pressure, and to realize a strong clamp. Furthermore, the space (valley part) between the mountains acts as an intermediate chamber, and it is possible to cope with the displacement of the attachment position. As a result, according to the seal member 6 according to the present embodiment, it is possible to ensure and maintain the sealed state of the connecting portion 21 c and the casing 3. The present inventors have confirmed that long-term operation (one year or more) can be achieved under high-pressure operation conditions (operation pressure: 0.6 MPa).

  Furthermore, according to the above-described embodiment, even if the bowl 2 has an eccentric motion due to the vibration (vibration) generated during the rotation operation of the bowl 2, the eccentric movement can be absorbed particularly at the central chevron, and Since the clamped portion is firmly clamped, it is possible to suppress the deterioration of the sealing characteristics. In the case of a configuration in which the bowl 2 is suspended and supported like the bowl-shaped decanter 1, this effect is particularly effective because it tends to cause an eccentric motion.

  Furthermore, according to the above-described embodiment, the three layers of the lower layer 67 formed of the fluorine-based resin, the intermediate layer 68 formed of the rubber-based resin, and the base fabric (that is, the upper layer) 69 formed of the nylon-based material are integrated. By adopting the sealing member 6 which is, sealing characteristics can be enhanced, and attachment to the apparatus is facilitated. Further, the sealing member 6 having the above-described configuration has an advantage that the strength of the sealing member 6 itself can be adjusted by changing the type of the base fabric 69.

  Furthermore, according to the above-described embodiment, the sealing characteristics can be ensured even if the tightening torque is reduced as compared with the conventional case, so that it is less likely to cause poor mounting or loosening of bolts and the like, and the mounting work to the apparatus is easy. It becomes. Further, since the diameter of the seal member 6 can be reduced, the attachment to the apparatus becomes easier.

Next, examples performed for confirming the effects of the present invention will be described.
In addition to the seal member 6 (a) according to the above-described embodiment, the present inventors have two peaks (b) only on the upper surface, one mountain (c) above and below, and two mountains only on the lower surface ( d) The sealing characteristics of the seal member without the convex part (e) were confirmed. The results are also shown in FIG.

  For the reasons already described, the sealing member (a) has good sealing characteristics based on the contact area (sealing characteristics: O), and leakage due to positional deviation due to vibration or the like did not occur (stable Sex: O). On the other hand, in the case of a single top and bottom (c), the sealing characteristics were good (◯), but leakage due to positional deviation was confirmed (stability: x). Further, the flat seal member (e) without a convex portion and the seal members (b) and (d) having either a flat upper surface or a lower surface have a large contact area and the compressive force is dispersed. The required surface pressure could not be secured with the same tightening torque as that of the sealing member (sealing characteristic: x).

When the above results are considered, it is assumed as follows.
That is, since rubber is also viscoelastic, plastic deformation is caused by stress relaxation under pressure, and plastic deformation is caused by creep under deformation. When plastic deformation occurs, the surface pressure required for sealing the contact portion decreases, so it is better that plastic deformation is less. For this reason, a material and shape in which the initial surface pressure is difficult to decrease over a long period of time are desired.

  The sealing member (a) has a structure having two convex portions, and compresses the apex to give a partial sealing surface pressure, while maintaining the sealing surface pressure and lowering the overall tightening pressure. At the same time, the deformation strain is released to the valley portion, and plastic deformation which is disadvantageous for long-term durability can be reduced. On the other hand, if it is a single mountain, since there is no valley, the tightening pressure increases, plastic deformation increases, and durability is not preferred. Accordingly, the sealing members (b) to (d) having the convex portions are also effective, but do not reach the sealing member (a).

  Although the present invention has been described in detail with reference to specific embodiments, various substitutions, modifications, changes, etc. in form and detail are defined in the claims. It will be apparent to those skilled in the art that this can be done without departing from the spirit and scope. Therefore, the scope of the present invention should not be limited to the above-described embodiments and the accompanying drawings, but should be determined based on the description of the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Decanter 2 Bowl 21b Shaft 21c Connection part 3 Casing 31 Drive motor 4 Screw conveyor 5 Gear box 6 Seal member 64 Center part of mountain shape 65 Clamped part 66 Clamped part 67 Lower layer formed by fluororesin 68 Rubber resin An intermediate layer formed by 69. Base fabric (upper layer) formed by nylon material
65a, 65b, 66a, 66b Convex part

Claims (4)

A casing forming a pressure vessel;
Rotation including a rotating body that rotates within the casing, a driving device that rotates the rotating body that is disposed outside the casing, and a connecting portion that connects the rotating body and the driving device through an opening of the casing. A processing mechanism;
A ring-shaped sealing member that seals a gap between the opening of the casing and a connecting portion located in the opening,
The seal member has a three-layer structure in which a layer of a fluorine-based resin material, a layer of a rubber-based resin material, and a base material of a nylon-based material are stacked in order from the side in contact with the internal atmosphere of the casing; and
The seal member has a cross-sectional shape formed in a central portion that is curved in a chevron shape that is disposed in a gap between the casing and the connecting portion, and at least two convex portions that are sandwiched between the casing and the clamping means of the connecting portion. A rotation processing device comprising clamped portions at both ends.   The rotation processing apparatus according to claim 1, wherein the at least two convex portions are formed on both a front surface and a back surface of the seal member.   The rotation processing apparatus according to claim 1, wherein the opening is formed on an upper side of the casing, and the rotating body is suspended and supported by a connecting portion.   The said rotary body contains the rotating bowl and screw conveyor which isolate | separate a solid and a liquid by the effect | action of a centrifugal force, The said rotation processing apparatus is a decanter type centrifuge, The Claims 1-3 characterized by the above-mentioned. Rotation processing device.

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