JP2017177022A - Centrifugal machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centrifugal machine that is capable of suppressing leakage of a liquid led out from a rotor from between the rotor and a drain container.SOLUTION: The centrifugal machine is provided with a drain container 21 that is provided with: a cylindrical enclosure 22 that covers the surroundings of a lead-out part 13; and a container body 23 that sections a space spreading downward from the enclosure 22 and receives a liquid led out from the lead-out part 13, and that receives the liquid led out from a rotor 11 through the enclosure 22 into the container body 23. The enclosure 22 is provided with: an external cylindrical enclosure 22A reduced in diameter at an upper end; and an internal cylindrical enclosure 22B that extends downward from the upper end in the external enclosure 22A and covers the surroundings of the lead-out part 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a centrifuge for separating a high specific gravity component from a liquid containing a low specific gravity component and a high specific gravity component.

  Centrifugal separators are known that separate high-density components such as sludge from the effluent discharged from a filtration device or the like. The rotor provided in the centrifuge rotates at high speed by the rotation of the drive shaft connected to the rotor, and deposits high specific gravity components in the drained liquid introduced into the rotor on the inner surface of the rotor, thereby causing sludge and the like. The high specific gravity component is separated from the effluent (see, for example, Patent Document 1).

Noto 3080305 gazette

By the way, the liquid after the high specific gravity component is separated is discharged from the rotor rotating at high speed, and flows into the drain container located at the rear stage of the rotor. At this time, the liquid material derived from the rotor is a liquid material that rotates at a high speed as the rotor rotates, and is derived from the rotor with a large momentum that can separate a high specific gravity component. Since the liquid material having such a large momentum may leak from a slight gap between the rotor and the drain container, in the above-described centrifuge, the liquid material derived from the rotor is centrifuged. There is a strong demand for technology to prevent leakage outside the machine.
An object of the present invention is to provide a centrifuge capable of suppressing leakage of a liquid material derived from a rotor from between a rotor and a drain container.

  A centrifuge for solving the above problem is a rotor having a space for accommodating a liquid material to be centrifuged, and includes a lead-out portion having a cylindrical shape opened downward, The rotor is configured to draw the liquid material inside from the lead-out portion during rotation of the rotor. In addition, the centrifuge includes a cylinder-shaped surrounding portion that covers the periphery of the lead-out portion, and a container main body that receives the liquid material led out from the lead-out portion by partitioning a space extending downward from the surrounding portion. A drain container including the drain container for receiving the liquid material led out from the rotor into the container body through the surrounding portion. The surrounding portion is an outer surrounding portion having a cylindrical shape whose diameter is reduced at the upper end portion, and an inner surrounding portion extending downward from the upper end portion in the outer surrounding portion, and surrounding the lead-out portion. And an inner enclosure portion having a cylindrical shape to cover.

  According to the above centrifugal separator, since the surrounding portion includes the inner surrounding portion that extends downward from the upper end portion of the outer surrounding portion, the liquid material received in the container body rebounds toward the upper end portion of the outer surrounding portion. However, at least a part of the bounced liquid is returned to the container body by the inner enclosure. Therefore, it is possible to suppress the liquid material from leaking from the upper end portion of the outer surrounding portion, and hence the liquid material led out from the rotor from leaking between the rotor and the drain container.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress that the liquid body derived | led-out from the rotor leaks from between a rotor and a drain container.

The block diagram which shows notionally the apparatus structure of the centrifuge in one Embodiment. The block diagram which shows notionally the apparatus structure of the centrifuge in other embodiment.

  A centrifuge according to an embodiment will be described with reference to FIG. As shown in FIG. 1, the centrifuge includes a rotor 11, a drain container 21, and a scraper 31.

  The rotor 11 includes a main body portion 12 and a lead-out portion 13. The main body portion 12 has a cylindrical shape with a diameter reduced downward, and the lead-out portion 13 has a cylindrical shape that opens downward from the main body portion 12. The rotor 11 receives a driving force of a motor 11M that is a driving source, and rotates at a high speed around a rotation axis A extending in the vertical direction.

  Around the lead-out portion 13, a flange 14 having an annular plate shape and a seal member 15 having an annular plate shape located below the flange 14 are located. The flange 14 is fixed to the casing of the centrifuge. The peripheral wall of the lead-out portion 13 has a circumferential groove 13G that is recessed toward the inside of the lead-out portion 13 and extends in the entire circumferential direction of the lead-out portion 13. The inner peripheral edge of the flange 14 is a protruding end that enters the circumferential groove 13 </ b> G, is separated from the outer peripheral surface of the lead-out portion 13, and allows the rotor 11 to rotate inside the flange 14. The seal member 15 is an elastic member fixed to the lower surface of the flange 14. The inner peripheral edge of the seal member 15 is also away from the outer peripheral surface of the lead-out portion 13 and allows the rotor 11 to rotate inside the seal member 15.

  The inner surface of the rotor 11 includes a protrusion 11 </ b> S having a spiral shape extending in the circumferential direction around the rotation axis A, that is, in the direction in which the rotor 11 rotates. The protrusion 11S is formed, for example, by cutting the inner surface of the rotor 11 while rotating the rotor 11. The ridge 11 </ b> S provided in the rotor 11 divides a groove along the ridge 11 </ b> S on the inner surface of the rotor 11, and enhances the collection performance of the high specific gravity component on the inner surface of the rotor 11. In particular, a high specific gravity component having fluidity and a high specific gravity component having a size sufficiently smaller than the protrusion 11S are easily collected in a groove defined on the inner surface of the rotor 11, and thereby, these traps are collected. Collection performance is improved.

  The drain container 21 includes an enclosure 22 and a container body 23. The surrounding portion 22 has a cylindrical shape that enables the surrounding of the lead-out portion 13 to be enclosed, and the container body 23 defines a space that extends below the surrounding portion 22 in a state where the surrounding portion 22 surrounds the lead-out portion 13. To do. The drain container 21 receives a driving force of an actuator 21M that is a driving source, rotates about a rotation shaft 21R perpendicular to the paper surface of FIG. 1, and an operating position where the surrounding portion 22 surrounds the lead-out portion 13 (FIG. 1). 2) and a retracted position (solid line in FIG. 1) that is the position where the surrounding portion 22 is retracted from the periphery of the lead-out portion 13. The container body 23 includes an introduction part 25 that enters the inside of the lead-out part 13 in the operating position. The introduction unit 25 introduces the liquid material that is a separation target to be centrifuged into the rotor 11 from the introduction unit 25, that is, in a direction opposite to the lead-out direction. In addition, the drain container 21 receives the liquid material led out from the lead-out portion 13 in the lead-out direction into the container main body 23 through the surrounding portion 22, and discharges the received liquid material from the discharge port 24.

  The surrounding portion 22 includes an outer surrounding portion 22A and an inner surrounding portion 22B. The outer surrounding portion 22 </ b> A has a cylindrical shape whose diameter is reduced at the upper end portion in the operating position, and includes an upper end portion 22 </ b> E that contacts the seal member 15. The upper end portion 22 </ b> E at the operating position prevents the liquid material from leaking from between the upper end portion 22 </ b> E and the seal member 15 due to contact with the seal member 15. Further, the upper end portion 22E at the operating position is separated from the outer peripheral surface of the lead-out portion 13, and allows the rotor 11 to rotate inside the upper end portion 22E.

  The inner surrounding portion 22B is integral with the upper end portion 22E in the outer surrounding portion 22A, and has a cylindrical shape that extends downward from the upper end portion 22E in the operating position. The inner surrounding portion 22B in the operating position is separated from the outer peripheral surface of the lead-out portion 13, and allows the rotor 11 to rotate inside the inner surrounding portion 22B. When the rotor 11 rotates while the drain vessel 21 is in the operating position and the liquid material is introduced from the introduction portion 25, the high specific gravity component contained in the liquid material is collected on the inner surface of the rotor 11. The Further, the liquid material from which the high specific gravity component has been separated is received by the container body 23 of the drain container 21 through the lead-out part 13 and the surrounding part 22.

  At this time, the surrounding portion 22 includes an inner surrounding portion 22B extending downward from the upper end portion 22E of the outer surrounding portion 22A. Therefore, even if the liquid material received in the container body 23 bounces back toward the upper end portion 22E of the outer enclosure portion 22A, at least a part of the bounced liquid material is returned to the container body by the inner enclosure portion 22B. Therefore, it is possible to prevent the liquid material from leaking from the upper end portion 22E of the outer surrounding portion 22A, and hence the liquid material led out from the rotor 11 from leaking between the rotor 11 and the drain container 21.

  The scraper 31 includes a scraper arm 32 and a scraping portion 33 fixed to the tip of the scraper arm 32. The scraper arm 32 has a plate shape through which the scraping portion 33 can be taken in and out of the rotor 11 through the lead-out portion 13. The scraper 31 receives a driving force of an actuator 31M that is a driving source, rotates about a rotation shaft 31R perpendicular to the paper surface of FIG. 1, and an operating position where the scraping portion 33 is in contact with the inner surface of the rotor 11 (see FIG. 1) and a retracted position (solid line in FIG. 1) that is the position where the scraping portion 33 is retracted from the rotor 11. When the rotor 11 rotates with the drain container 21 positioned at the retracted position and the scraper 31 positioned at the operating position, the high specific gravity component collected on the inner surface of the rotor 11 is scraped by the scraping portion 33. .

As mentioned above, according to the said embodiment, the effect enumerated below is acquired.
(1) It is possible to suppress the liquid material from leaking from the upper end portion 22E of the outer surrounding portion 22A, thereby suppressing the liquid material led out from the rotor 11 from leaking between the rotor 11 and the drain container 21. Become.

  (2) The protrusion 11S located on the inner surface of the rotor 11 suppresses the high specific gravity component from flowing down along the inner surface of the rotor 11, thereby improving the collection performance of the high specific gravity component.

In addition, the said embodiment can be changed and implemented as follows.
The high specific gravity component contained in the liquid material is collected on the inner surface of the rotor 11 over almost the entire upper end portion to the lower end portion of the inner surface of the rotor 11. Here, as shown in FIG. 2, the inner surface of the main body 12 included in the rotor 11 may be in the shape of a truncated cone with the lower part at the top. If the inner surface of the rotor 11 has a truncated cone surface, the shape of the scraped portion 33 that contacts the inner surface of the rotor 11 may be a shape that extends in a substantially tangential direction of an arc centered on the rotation shaft 31R. It will be possible. Therefore, the contact between the inner surface of the rotor 11 and the scraping portion 33 can be made more reliable, and as a result, the high specific gravity component collected on the inner surface of the rotor 11 can be scraped more reliably. Is possible. In addition, since the scraping portion 33 through the lead-out portion 13 can be easily put in and out by rotation around the rotation shaft 31R, the opening diameter 11R in the lead-out portion 13 can be reduced.

  The flange 14 and the seal member 15 may be omitted, or the protrusion 11S may be omitted from the inner surface of the rotor 11. Even in such a configuration, the surrounding portion 22 including the outer surrounding portion 22A having a cylindrical shape reduced in diameter at the upper end portion 22E and the inner surrounding portion 22B extending downward from the upper end portion 22E in the outer surrounding portion 22A. If the drain container 21 is configured, it is possible to obtain the effect according to the above (1).

  In addition, the drain container 21 may be omitted, and even in such a configuration, if the inner surface of the rotor 11 includes the protrusions 11S, or the inner surface of the rotor 11 has a truncated cone surface shape, The effect according to the above (2) and the effect of suppressing the remaining high specific gravity component can be obtained.

The technical ideas derived from the above-described embodiments and modifications will be described below.
[Appendix 1]
A rotor having a space for accommodating a liquid material to be centrifuged, and having a cylindrical outlet opening downward, the liquid material in the interior being rotated during rotation of the rotor Comprising the rotor configured to be derived from the derivation unit;
The centrifuge according to claim 1, wherein the inner surface of the rotor has a ridge extending in a circumferential direction around a rotation axis of the rotor.

  According to the centrifuge described in the above supplementary note 1, it is possible to enhance the collection performance of the high specific gravity component on the inner surface of the rotor, whether the centrifuge is equipped with a drain container or the centrifuge without the drain container. It becomes.

[Appendix 2]
A rotor having a space for accommodating a liquid material to be centrifuged, and having a cylindrical outlet opening downward, the liquid material in the interior being rotated during rotation of the rotor The rotor configured to be derived from the derivation unit;
A scraper configured to be able to be inserted into and removed from the lead-out portion with respect to the inside of the rotor, the scraper including a scraping portion that contacts an inner surface of the rotor in a state where the scraper is located inside the rotor; Prepared,
The inner surface of the rotor is a centrifuge having a truncated conical cylindrical shape with a lower portion at the top.

  According to the centrifuge described in appendix 2, the contact between the inner surface of the rotor and the scraped portion is more reliable, whether the centrifuge includes a drain container or the centrifuge does not include a drain container. It is possible to easily scrape out the high specific gravity component collected on the inner surface of the rotor.

  A, 21R, 31R ... rotating shaft, 11 ... rotor, 11M ... motor, 21M, 31M ... actuator, 11R ... opening diameter, 11S ... ridge, 12 ... body part, 13 ... lead-out part, 14 ... flange, 15 ... seal Member, 21 ... drain container, 22 ... enclosure part, 22A ... outer enclosure part, 22B ... inner enclosure part, 22E ... upper end part, 23 ... container body, 24 ... discharge port, 25 ... introduction part, 31 ... scraper, 32 ... Scraper arm, 33 ... scraping part.

Claims (3)

A rotor having a space for accommodating a liquid material to be centrifuged, and having a cylindrical outlet opening downward, the liquid material in the interior being rotated during rotation of the rotor The rotor configured to be derived from the derivation unit;
A drain container comprising an enclosing portion having a cylindrical shape that covers the periphery of the lead-out portion, and a container body that partitions the space extending downward from the surround portion and receives the liquid material led out from the lead-out portion. The drain container receiving the liquid material derived from the rotor into the container body through the surrounding portion, and
The surrounding portion is an outer surrounding portion having a cylindrical shape whose diameter is reduced at an upper end portion, and an inner surrounding portion extending downward from the upper end portion in the outer surrounding portion, the tube surrounding the lead-out portion A centrifuge comprising the inner enclosure having a shape. The centrifuge according to claim 1, wherein an inner surface of the rotor has a protrusion that extends in a circumferential direction around a rotation axis of the rotor. The centrifuge according to claim 1, wherein an inner surface of the rotor has a truncated cone cylindrical shape with a lower portion as a top portion.