Filtering device

Abstract

To improve the sealability of a storage container while preventing an increase in filtration resistance with the growth of a cake layer.SOLUTION: A filtering device 1 includes: a storage container 2 that stores slurry and has a bottom plate formed of a filter 6 (a filter medium); and a stirring unit 3 in which a stirring blade that stirs the slurry by rotating in the storage container 2 and a scraper that inhibits growth of a cake layer deposited on the filter 6 by rotating in the storage container 2 are integrally formed. The stirring unit 3 composing the stirring blade and the scraper is configured to be magnetically coupled to a rotor 11 (a rotating body) disposed outside the storage container 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a filtration device. [Background technology]

[0002] Patent Document 1 discloses a filtration device having an agitating blade inside a sealed container. The agitating shaft of the agitating blade protrudes upward from the sealed container and is driven to rotate by a motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-165367 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration of Patent Document 1, when the slurry is stirred and filtered, the filtration resistance increases as the cake layer grows.

[0005] An object of the present disclosure is to provide a technology for improving the sealing performance of a storage container while suppressing an increase in filtration resistance that accompanies the growth of a cake layer. [Means for solving the problem]

[0006] A storage container that stores slurry and has a bottom plate made of a filter material; a stirring blade that rotates in the container to stir the slurry; A scraper that rotates in the container to inhibit the growth of a cake layer that accumulates on the filter medium; Including, The stirring blade and the scraper are configured to be magnetically coupled to a rotor arranged outside the storage container. A filtration device is provided. According to the above configuration, it is possible to improve the sealing performance of the storage container while suppressing an increase in filtration resistance that accompanies the growth of the cake layer. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to improve the sealing performance of the storage container while suppressing an increase in filtration resistance that accompanies the growth of the cake layer. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cutaway perspective view of a filtering device (first embodiment). [Figure 2] 10 is a cutaway perspective view of the stirring unit (second embodiment). [Figure 3] 10 is a cross-sectional front view of a filtering device (third embodiment). DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described below through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential means for solving the problems. For clarity of explanation, the following description and drawings have been omitted and simplified as appropriate. In each drawing, the same elements are given the same reference numerals, and repeated explanations are omitted as necessary.

[0010] (First embodiment) A first embodiment of the present disclosure will be described below with reference to Fig. 1. As shown in Fig. 1, the filtration device 1 includes a storage container 2 and an agitation unit 3. The filtration device 1 employs a dead-end filtration method. The filtration device 1 is used to filter, concentrate, and separate the slurry stored in the storage container 2 into solid and liquid.

[0011] The storage container 2 contains the slurry. The storage container 2 includes a cylindrical outer wall 4 extending in the vertical direction, an annular guide rail 5 provided at the lower end of the outer wall 4, a filter 6 serving as a filtering medium provided on the lower surface of the guide rail 5, and a lid (not shown) that closes the upper end of the outer wall 4. The guide rail 5 has a flange 5a that protrudes radially inward from the outer wall 4. The upper surface 6a of the filter 6 is horizontally positioned when the filtration device 1 is in use. The filter 6 corresponds to the bottom plate of the storage container 2.

[0012] The stirring unit 3 functions as a stirring blade that stirs the slurry by rotating in the storage container 2, and as a scraper that inhibits the growth of a cake layer that accumulates on the upper surface 6a of the filter 6 by rotating in the storage container 2. In other words, in this embodiment, the stirring unit 3 includes a stirring blade and a scraper. The stirring blade and the scraper are integrated to form the stirring unit 3.

[0013] The agitation unit 3 includes a plurality of blades 7 extending radially outward from the center of the container 2, and an annular drive portion 8 connected to radially outer ends of the plurality of blades 7.

[0014] Each blade 7 is formed to be inclined so as to approach the filter 6 in the direction of rotation of the agitation unit 3 in order to move the slurry away from the filter 6. Each blade 7 has a scraper portion 7a and an agitation blade portion 7b. The scraper portion 7a is closer to the filter 6 than the agitation blade portion 7b.

[0015] The scraper portion 7a inhibits the growth of a cake layer that accumulates on the upper surface 6a of the filter 6 as the agitation unit 3 rotates. In other words, as the cake layer grows, filtration resistance increases, reducing the flow rate of liquid separated from the slurry through the filter 6. Therefore, by inhibiting the growth of the cake layer, the scraper portion 7a prevents a decrease in the flow rate of liquid separated from the slurry through the filter 6. The scraper portion 7a is inclined so that it approaches the filter 6 as it rotates. The scraper portion 7a scrapes off the cake layer that accumulates on the upper surface 6a of the filter 6 as the agitation unit 3 rotates. The cake layer itself also functions as a filter medium. Therefore, it is possible to scrape off the cake layer from the upper surface 6a of the filter 6 without completely removing it, leaving only a small thickness of the cake layer. The scraper portion 7a is slightly raised above the filter 6 to prevent damage to the filter 6. However, if the filter 6 is not damaged even when the scraper portion 7a comes into contact with the filter 6, the stirring unit 3 may be arranged so that the scraper portion 7a comes into contact with the filter 6. To prevent damage to the filter 6, a filter cover (not shown) may be provided on the upper surface 6a of the filter 6.

[0016] As the stirring unit 3 rotates, the stirring blade portion 7b pushes the slurry radially outward toward the outer peripheral wall 4 of the storage vessel 2 and stirs the slurry in the storage vessel 2 so as to move the slurry away from the filter 6. For this reason, the stirring blade portion 7b is inclined so as to approach the filter 6 as it moves in the direction of rotation. The stirring blade portion 7b is formed so that the slurry forms a spiral upward flow near the outer peripheral wall 4 of the storage vessel 2. That is, in the internal space of the storage vessel 2, a downward flow of the slurry is formed radially inward, and an upward flow of the slurry is formed radially outward. The stirring blade portion 7b is formed so that the velocity distribution of the slurry is uniform in the circumferential direction in a plan view, and the slurry is stirred without stagnation.

[0017] In each blade 7 in this embodiment, the scraper portion 7a and the stirring blade portion 7b are, for example, smoothly connected without any creases.

[0018] The annular drive unit 8 includes an annular wall 8a extending annularly to accommodate the blades 7 radially inward, a plurality of magnet housings 8b protruding radially inward from the annular wall 8a, and a driven-side permanent magnet 8c accommodated in each magnet housing 8b. In this embodiment, the plurality of magnet housings 8b are composed of four magnet housings 8b. Accordingly, the plurality of driven-side permanent magnets 8c are similarly composed of four driven-side permanent magnets 8c. The four magnet housings 8b and the four driven-side permanent magnets 8c correspond one-to-one to each other and are arranged at equal intervals in the circumferential direction. The annular wall 8a has a flange 8d protruding radially outward. The flange 8d of the annular drive unit 8 is mounted on the flange 5a of the guide rail 5 and is slidable circumferentially relative to the flange 5a of the guide rail 5. When the stirring unit 3 rotates within the container 2, the flange 8d of the annular drive unit 8 slides circumferentially while contacting the flange 5a of the guide rail 5. Therefore, by changing the thickness, shape, and position of the flange 5a of the guide rail 5 and the flange 8d of the annular drive portion 8, the gap between the scraper portion 7a of the blade 7 and the filter 6 can be adjusted.

[0019] The stirring unit 3 is configured to be magnetically coupled to a rotor 11 of a stirring station 10 arranged outside the storage container 2. The rotor 11 is a specific example of a rotating body. When the rotor 11 rotates, the stirring unit 3 magnetically coupled to the rotor 11 also rotates. Therefore, compared to a configuration in which a rotating shaft is provided in the stirring unit 3 and the rotating shaft protrudes outside the storage container 2, a high level of sealing can be achieved at the outer wall 4 of the storage container 2 and at the lid (not shown).

[0020] The stirring station 10 includes the rotor 11, a housing 12 for receiving the liquid that has passed through the filter 6 of the filtration device 1, a drain 13 for discharging the liquid received by the housing 12, and a motor 14 for rotating the rotor 11.

[0021] The rotor 11 includes a support plate 11a formed in a doughnut shape so as to surround the drain 13, and a plurality of drive-side permanent magnets 11b arranged on the outer periphery of the support plate 11a. The plurality of drive-side permanent magnets 11b of the rotor 11 are magnetically coupled one-to-one with a plurality of driven-side permanent magnets 8c of the annular drive unit 8, with the filter 6 sandwiched between them. With this configuration, when the motor 14 drives and rotates the rotor 11, the stirring unit 3 rotates within the container 2 via the magnetic coupling between the plurality of drive-side permanent magnets 11b of the rotor 11 and the plurality of driven-side permanent magnets 8c of the annular drive unit 8.

[0022] In this way, by adopting a configuration in which the stirring unit 3 is rotated externally using magnetic coupling, there is no need to provide a power source for rotating the stirring unit 3 in the storage container 2 itself. In other words, the filtration device 1 can be transported separately from the stirring station 10. This reduces the weight of the filtration device 1 during transportation, improving the ease of transporting the filtration device 1.

[0023] The multiple driven-side permanent magnets 8c of the annular driving unit 8 and the multiple driving-side permanent magnets 11b of the rotor 11 are both arranged at the radially outer end of the annular driving unit 8 and the radially outer end of the rotor 11. This makes it possible to prevent loss of synchronization in the magnetic coupling between the annular driving unit 8 and the rotor 11.

[0024] The first embodiment has been described above. The first embodiment has the following features.

[0025] The filtration device 1 includes a storage container 2 that stores slurry and has a bottom plate made of a filter 6 (filter material), and an agitation unit 3 that integrally comprises an agitation blade that rotates within the storage container 2 to agitate the slurry, and a scraper that rotates within the storage container 2 to inhibit the growth of a cake layer that accumulates on the filter 6. The agitation unit 3, which comprises the agitation blade and scraper, is configured to be magnetically coupled to a rotor 11 (rotating body) disposed outside the storage container 2. This configuration can improve the sealing performance of the storage container 2 while suppressing an increase in filtration resistance that accompanies the growth of the cake layer. Note that instead of being configured integrally, the agitation blade and scraper may be configured as separate bodies.

[0026] (Second embodiment) Next, a second embodiment will be described with reference to Fig. 2. Below, the differences between this embodiment and the first embodiment will be mainly described, and overlapping descriptions will be omitted.

[0027] In the first embodiment, the agitation unit 3 has a plurality of blades 7. Each blade 7 has a scraper portion 7a and an agitation blade portion 7b. The scraper portion 7a and the agitation blade portion 7b are connected to each other.

[0028] In contrast, in this embodiment, as shown in Fig. 2, the stirring unit 3 does not include a plurality of blades 7. As shown in Fig. 2, the stirring unit 3 includes a plurality of scrapers 20, a plurality of stirring impellers 21, and the annular drive unit 8 described above.

[0029] The multiple scrapers 20 are formed to extend radially from the center of the storage container 2. That is, the multiple scrapers 20 are connected to one another at the center of the storage container 2. Furthermore, the radially outer ends of the multiple scrapers 20 are connected to the annular drive unit 8.

[0030] Similarly, the plurality of stirring blades 21 are formed so as to extend radially from the center of the storage vessel 2. That is, the plurality of stirring blades 21 are connected to one another at the center of the storage vessel 2. Furthermore, the radially outer ends of the plurality of stirring blades 21 are connected to the annular drive unit 8.

[0031] The plurality of scrapers 20 and the plurality of stirring blades 21 are arranged apart from each other in the vertical direction.

[0032] In this way, by arranging the scraper 20 and the mixing blade 21 apart from each other vertically, it is thought that the degree of freedom in designing the scraper 20 and the mixing blade 21 can be improved.

[0033] (Third embodiment) Next, a third embodiment will be described with reference to Fig. 3. Below, the differences between this embodiment and the first embodiment will be mainly described, and overlapping descriptions will be omitted.

[0034] In the first embodiment, as shown in FIG. 1, the annular driving portion 8 of the stirring unit 3 is provided with a plurality of driven-side permanent magnets 8c.

[0035] In contrast, in this embodiment, as shown in Fig. 3, a blade shaft 30 connected to a plurality of blades 7 is disposed to extend upward. A disk-shaped driven disk 31 is provided at the upper end of the blade shaft 30. A plurality of driven-side permanent magnets 31a are provided on the outer periphery of the driven disk 31. The driven disk 31 is covered by a lid 32 that covers the top of the storage container 2. In other words, the driven disk 31 is not exposed to the outside because it is covered by the lid 32. The top of the storage container 2 is completely covered by the lid 32, and therefore the space above the storage container 2 is completely closed by the lid 32.

[0036] A cylindrical rotor 33 with a bottom and a motor 34 that rotates the rotor 33 are provided above the filtration device 1. The rotor 33 is provided with a plurality of driving-side permanent magnets 33a that are magnetically coupled in a non-contact manner to a plurality of driven-side permanent magnets 31a via the lid 32. With the above configuration, when the motor 34 rotates the rotor 33, the rotational torque of the rotor 33 is transmitted to the driven disk 31 without loss by the plurality of driven-side permanent magnets 31a and the plurality of driving-side permanent magnets 33a that are magnetically coupled via the lid 32.

[0037] According to the third embodiment, the rotor 33 and the motor 34 are disposed above the filtration device 1, thereby making it possible to effectively utilize the space below the filtration device 1. For example, a complex recovery mechanism for the liquid separated from the slurry can be disposed in the space below the filtration device 1, or a multi-stage filtration device can be configured by disposing another filtration device therein. [Explanation of symbols]

[0038] 1 Filtration device 2. Storage container 3 Mixing unit 4 Outer wall 5 guide rails 6 Filters 7 Blades 7a Scraper part 7b Mixing blade part 8 Ring drive unit 8a Circular Wall 8b Magnet housing 8c Driven side permanent magnet 8d flange 10 Stirring Station 11 rotor 11a Support plate 11b Drive side permanent magnet 12. Case 13 Drain 14 motor

Claims

[Claim 1] A storage container that stores slurry and has a bottom plate made of a filter material; a stirring blade that rotates in the container to stir the slurry; A scraper that rotates in the container to inhibit the growth of a cake layer that accumulates on the filter medium; Including, The stirring blade and the scraper are configured to be magnetically coupled to a rotor arranged outside the storage container. Filtration device.

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