JP5201582B2 - Solid-liquid separator - Google Patents

Description

The present invention relates to a solid- liquid separator, and can maintain a predetermined rigidity, particularly when an electromagnet is turned on, and can be touched down to a bearing when the power is turned off, and against eccentricity perpendicular to the control direction. while working effectively be about solid-liquid separator has less leakage of the magnetic flux in the eccentric direction.

  Solid-liquid separators that separate solids and liquids based on the principle of centrifuges are widely used in product manufacturing and wastewater treatment in the fields of chemical industry, mining industry, ceramic industry, and metal industry. For example, in the chemical industry, nickel alloys and aluminum hydroxide alloys used in mobile phones are used to collect fine powder, and in the mining, ceramics, and metal industries, it is used to collect pulverized coal and metal ores. ing.

  As a solid-liquid separator, a horizontal type as shown in FIG. 23 is the mainstream. By the way, it has been recognized that the horizontal type is inefficient because separated water accumulates at the bottom of the cylinder. Therefore, in order to improve this efficiency, if the vertical type as shown in FIG. 24 is used, the separated water diffuses in the direction of 360 degrees, so that solid-liquid separation can be performed efficiently.

  FIG. 25 shows the structure of the vertical solid-liquid separator 100. This structure is disclosed in Patent Document 1. In FIG. 25, an inner cylinder 5 is rotatably supported inside the outer cylinder 1 via an angular bearing 3. By this angular bearing 3, the inner cylinder 5 is stably supported in both the radial direction and the axial direction.

  And inside this inner cylinder 5, the screw conveyor 7 provided with the shunt rib board 6 (equal spreading | diffusion apparatus) which protruded spirally around the circumference | surroundings is made rotatable. A passage 9 is formed in an intermediate portion of the screw conveyor 7. The passage 9 communicates with a through hole 11 that penetrates the center of the screw conveyor 7, and the through hole 11 communicates with a feed port 13 formed at the upper end of the outer cylinder 1. A weir 15 is formed in the space between the upper surface of the outer cylinder 1, the inner cylinder 5, and the screw conveyor 7, and the weir 15 leads to a discharge port 17 provided in the outer cylinder 1.

  The inner cylinder 5 and the screw conveyor 7 are rotated in the same direction with a speed difference by a differential speed device (not shown) attached to the upper part of the main body. When the stock solution is introduced from the feed port 13 at the top of the main body, it enters a space formed between the inner cylinder 5 and the screw conveyor 7 through the through hole 11 and the passage 9. Thereafter, the solid matter adheres to the inner wall of the inner cylinder 5 by the centrifugal effect and is discharged downward by the screw conveyor 7, and the separated liquid having a low specific gravity rises by thrust and is discharged to the outside through the discharge port 17 through the weir 15. The

  Next, features of the vertical solid-liquid separator 100 will be described. In the middle of the screw conveyor 7, a diverting rib plate 6 (equal diffusion device) is provided, and the supplied stock solution is diffused in the direction of 360 degrees.

  And since each component is balanced and the weight is evenly distributed to form a stable structure, it is stable with a fine vibration type. The dehydration effect has a low water content of 5 to 20% or more as compared with a conventional dehydrator. Since the solid-liquid separation is performed by centrifugal force and the specific gravity difference between the solid and the liquid, sub-micron fine particles can be recovered if the solid slurry has a specific gravity difference. In addition, it can handle a wide range from dehydration to concentration.

  By the way, in order to further increase the efficiency of the solid-liquid separation operation described above, it is desired to increase the processing capacity by increasing the size of the apparatus. At this time, it is necessary to increase the diameter of the angular bearing 3 as the apparatus becomes larger. However, there is no angular bearing 3 larger than the current one according to the standard.

Therefore, in order to solve this problem, the present inventors have proposed and studied to adopt a magnetic bearing instead of the angular bearing 3. With the increase in the size of this apparatus, it has also been examined that the electromagnetic force is required to be approximately 7000 (N) or more in the axial direction. Heretofore, for example, Patent Document 2 and Patent Document 3 are known as prior arts that support the axial direction and the radial direction by a magnetic bearing.
JP 2007-038068 A Japanese Patent Laying-Open No. 2005-121157 (FIG. 8) JP-A-8-296645 (FIG. 8)

  By the way, in the conventional methods according to Patent Document 2 and Patent Document 3, an attractive force is generated by a combination of an electromagnet and a permanent magnet, and the direction of the iron core of the electromagnet and the direction of the magnetomotive force of the permanent magnet match. It is arranged. For this reason, even after the electromagnet is turned off, an attractive force remains due to the action of the permanent magnet on the iron core. Therefore, the apparatus could not be stopped by touching down separately provided bearings.

The present invention has been made in view of such a conventional problem, and can maintain a predetermined rigidity when the electromagnet is turned on, can touch down the bearing when the power is turned off, and has a control direction. and to provide a solid-liquid separator has less leakage of the magnetic flux in the eccentric direction while effectively acts against perpendicular eccentricity.

For this reason, the present invention (Claim 1) includes a rotating core formed on a rotating body that rotates about a rotating shaft, a permanent magnet that is disposed on the rotating core and has a magnetic pole in the axial direction, and the permanent magnet is opposed to the rotating magnet. A plurality of electromagnets that have magnetic poles in the axial direction and are evenly arranged around the rotation axis, a stator core to which the electromagnets are attached, and a position sensor that detects the axial position of the rotating body And an axial position adjusting means for adjusting an axial position of the rotating body based on a position signal detected by the position sensor, and a magnetic bearing device in which one permanent magnet is disposed in the axial direction. A vertical solid-liquid separator mounted, wherein the rotating body is an inner cylinder, and a screw driven at a speed different from that of the inner cylinder is provided inside the inner cylinder, and passes through the screw. The mixed stock solution of solid and liquid flowing in through the hole The solid and liquid by being passed while rotating between the clew is characterized in that it is separated
As described above, the magnetomotive force acting in the axial direction can be adjusted to the desired magnitude of the magnetomotive force.
When the undiluted solution flowing inside the inner cylinder is a magnetic material, the undiluted solution may be affected by the magnetic field generated by the magnetic bearing when it passes near the magnetic bearing. However, in a solid-liquid separator equipped with this magnetic bearing, the magnetic flux flows in a closed magnetic path during operation, while when stopped, a rotating core made of a material having a high relative permeability is used for the majority of the magnetic field of the permanent magnet. Since it is a leakage flux that flows, there is no influence of the magnetic field on the outside.
In addition, the present invention (Claim 2) includes a first closed magnetic path in which magnetic flux generated by the electromagnet and the permanent magnet passes through the stator core, the inner cylinder side gap, the inner cylinder, and the rotating core, and the electromagnet. And a magnetic flux generated by the permanent magnet is formed with the stator core, an outer cylinder connected to the stator core, an outer cylinder side gap, and a second closed magnetic path passing through the rotating core. .

Furthermore, the onset Ming, a rotary core of material with high relative permeability is formed on the rotating body which rotates about a rotation axis, a plurality of magnetic formed annularly around the rotation axis with respect to the rotating core A body part, at least one permanent magnet sandwiched between the magnetic body parts and having magnetic poles in the radial direction, and a ring disposed opposite to the magnetic body part to form a closed magnetic path via the permanent magnets A plurality of electromagnets each having a magnetic pole directed in the axial direction, a stator core to which the electromagnet is attached, a position sensor for detecting the axial position of the rotating body, and a position detected by the position sensor An axial position adjusting means for adjusting the axial position of the rotating body based on the signal may be provided .

  The relative magnetic permeability is desirably 7000 or more. When the current flowing through the electromagnet is cut off, the magnetic flux generated by the electromagnet flowing through the closed magnetic path disappears. At this time, the magnetic field of the permanent magnet is mostly leakage magnetic flux that flows through the rotating core made of a material with high relative permeability, so that the magnetic field acting in the axial direction is extremely weakened, and the rotating body falls by its own weight and falls to the bearing etc. Touch down.

  Further, the electromagnet is annular, and the permanent magnet is similarly annularly formed. For this reason, a closed magnetic circuit is formed in the electromagnet and the magnetic body part via the permanent magnet, and it can have a restoring force in the radial direction. As a result, the restoring force works even when the rotating body is displaced in the radial direction, so that it is possible to support in the radial direction.

  As described above, according to the present invention, a permanent magnet disposed on a rotating core and having a magnetic pole in the axial direction, and a rotating magnet having a magnetic pole in the axial direction disposed on the stator core opposite to the permanent magnet. Since it comprises a plurality of electromagnets arranged evenly around, the magnetomotive force acting in the axial direction can be adjusted to the desired magnitude of the magnetomotive force.

  Hereinafter, embodiments of the present invention will be described. The conceptual block diagram of the magnetic bearing periphery of the solid-liquid separator 200 which is 1st Embodiment of this invention is shown in FIG. In FIG. 1, a stator core 29 is provided on the inner wall of the outer cylinder 21 so as to protrude inward in an annular shape in parallel with the upper end surface 27 of the outer cylinder 21.

  As shown in FIG. 2, four electromagnets 33A, 33B, 33C, 33D and gap sensors 34A, 34B, 34C, 34D are disposed on the lower surface of the stator core 29. The electromagnets 33 </ b> A, 33 </ b> B, 33 </ b> C, and 33 </ b> D are excited to have an N pole on the upper side and an S pole on the lower side.

  In addition, a rotor core 35 is provided in a projecting manner in the vicinity of the center of the inner cylinder 25. A hollow annular permanent magnet 37 is fixed to the upper surface of the rotor core 35 as shown in FIG. The permanent magnet 37 is magnetized with an N pole on the upper side and an S pole on the lower side. The inner cylinder 25 rotates around the rotation axis. A touchdown bearing 23 is interposed between the upper end surface of the outer cylinder 21 and the outer peripheral wall of the inner cylinder 25 in an annular shape.

Next, the operation of the first embodiment of the present invention will be described.
The distance (gap) in the axial direction to the rotor core 35 is measured by the gap sensors 34A, 34B, 34C, and 34D. And the electric current sent through electromagnet 33A, 33B, 33C, 33D is changed so that this measured distance may become a desired value. This makes it possible to adjust the axial position during operation.

  In FIG. 1, the direction of the magnetic flux is indicated by a dotted line. The magnetic flux is generated by the permanent magnet 37 and the electromagnets 33A, 33B, 33C, and 33D. One route is formed by a magnetic path passing through the outer cylinder 21, and the other route is formed by a magnetic path passing through the inner cylinder 25. .

  For this reason, both the electromagnet magnetic flux and the permanent magnet magnetic flux have little leakage magnetic flux. Predetermined rigidity can be maintained when the electromagnets 33A, 33B, 33C, and 33D are turned on. When the power is turned off, the inner cylinder 25 falls due to its own weight and touches down the touch-down bearing 23.

  Here, a simulation was performed to determine how much magnetomotive force can be generated in the axial direction. The simulation used finite element method analysis software for magnetic bearing modeling and electromagnetic force analysis. FIG. 4 shows the drawing of the basic simplified model on the stator side, FIG. 5 shows the drawing on the rotor side, and FIG. 6 shows the materials and specifications used in the simulation.

  As shown in FIG. 4, the stator core 29 is provided with four electromagnet cores 29a, and coils are wound around the electromagnet cores 29a to form electromagnets 33A, 33B, 33C, and 33D. However, the number of electromagnets is not limited to four, and may be two or three. Although four gap sensors 34A, 34B, 34C, and 34D are arranged in accordance with the electromagnets, one gap sensor 34A, 34B, 34C, and 34D may be arranged in the Y-axis direction.

Since the electromagnets 33A, 33B, 33C, and 33D have a wide effective gap cross-sectional area, the axial electromagnetic force is large.
In this way, by dividing the electromagnet into a plurality of pieces, in addition to axial position control, tilt control is also possible.

  The analysis results are shown in FIG. From this, it can be seen that the magnetomotive force acting in the axial direction exceeds the desired magnetomotive force 7000 (N) when a current of about 6 (A) is passed.

Next, a second embodiment of the present invention will be described.
The conceptual block diagram of the magnetic bearing periphery of the solid-liquid separator 300 which is 2nd Embodiment of this invention is shown in FIG. Note that the same elements as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. In FIG. 8, two electromagnet cores 29 a and 29 b protrude from the lower surface of the stator core 29.

  One annular slot 49 is formed between the two electromagnet cores 29a and 29b. Then, windings are disposed on the annular slot 49 and the inner side of the electromagnet core 29a and on the outer side of the annular slot 49 and the electromagnet core 29b, respectively. As shown in FIG. 8, the direction of the magnetic flux is upward for the electromagnet core 29a and downward for the electromagnet core 29b.

  As a result, the electromagnets 43 and 45 are formed in an annular shape around the rotation axis with the annular slot 49 interposed therebetween. On the other hand, on the upper surface of the rotor core 35, magnetic bodies 51 and 53 project in a ring shape around the rotation axis so as to face the electromagnet cores 29a and 29b.

  An annular permanent magnet 55 is fixed between the magnetic bodies 51 and 53. The permanent magnet 55 is installed in the radial direction and has an N pole on the inner side and an S pole on the outer side. That is, the direction of the magnetic pole of the permanent magnet 55 is arranged at right angles to the protruding direction of the iron cores 29a and 29b of the electromagnets 43 and 45.

Next, the operation of the second embodiment of the present invention will be described.
The gap sensor 44 measures the axial distance (gap) to the rotor core 35. And the electric current sent through the electromagnets 43 and 45 is changed so that this measured distance may become a desired value.

  As a result, the axial position during operation can be adjusted. In FIG. 8, the direction of the magnetic flux is indicated by a dotted line. The magnetic flux is generated by the permanent magnet 55 and the electromagnets 43 and 45, and a closed magnetic path is formed through the stator core 29 and the magnetic bodies 51 and 53. The rotor core 35 is made of an electromagnetic steel plate and has a high relative permeability so that magnetic flux can easily pass therethrough. Here, the rotor core 35 is not limited to an electromagnetic steel plate, and may be carbon steel. The relative magnetic permeability is desirably 7000 or more.

  When the current flowing through the electromagnets 43 and 45 is cut off, the magnetic flux generated by the electromagnets 43 and 45 flowing through the closed magnetic path disappears. At this time, the magnetic field acting in the axial direction is extremely weakened, and the inner cylinder 25 falls due to its own weight and touches down the touch-down bearing 23.

  Here, in the methods disclosed in Patent Document 2 and Patent Document 3, since the direction of the magnetic pole of the permanent magnet and the direction of the iron core of the electromagnet coincide with each other, the magnetic field of the permanent magnet even after the current of the electromagnet is cut off. Will continue to act directly on the iron core of the electromagnet and the attractive force will not disappear much. For this reason, the inner cylinder 25 cannot be touched down to the touchdown bearing 23.

  Further, the electromagnets 43 and 45 are annular, and the cross section is a U-shape as shown in FIG. 8, and the magnetic bodies 51 and 53 and the permanent magnet 55 facing the same are also formed in an annular shape, and the cross section is illustrated. As shown in FIG. Therefore, the magnetic flux generated by the electromagnets 43 and 45 and the permanent magnet 55 passes through the rotor core 35, the magnetic bodies 51 and 53, and the stator core 29 to form a closed magnetic path, and has a restoring force in the radial direction. Can do. As a result, a restoring force is exerted even when the inner cylinder 25 is displaced in the radial direction, so that support in the radial direction is possible. The arrangement method of the electromagnets 43 and 45 is not limited to the ring shape, and the necessary number of the electromagnets 43 and 45 (for example, four sets as shown in FIG. 2) is arranged around the rotation axis. May be.

  Furthermore, when the undiluted solution flowing inside the inner cylinder 25 is a magnetic material, the undiluted solution may be affected by the magnetic field generated by the magnetic bearing when it passes near the magnetic bearing. However, in the solid-liquid separator 300 equipped with the magnetic bearing of the present embodiment, the magnetic flux flows in the closed magnetic path during operation, while the magnetic field of the permanent magnet 55 is mostly the magnetic flux that flows through the magnetic steel sheet when stopped. Therefore, there is no influence of the magnetic field on the outside.

  Here, a simulation was performed to determine how much magnetomotive force can be generated in the axial direction for the magnetic bearing of the second embodiment. The simulation used finite element method analysis software for magnetic bearing modeling and electromagnetic force analysis. FIG. 9 shows a drawing of a basic simplified model on the stator side, and FIG. 10 shows a drawing on the rotor side. The analysis results are shown in FIGS.

  From this, when the current of the electromagnet is cut off, that is, when the current value is 0 (A), the electromagnetic force acting in the axial direction is as small as about 750 (N), so the inner cylinder 25 is touched down to the touch-down bearing 23. Can do. Furthermore, it can be seen from FIG. 12 that a sufficiently large restoring force can be applied in the radial direction.

  Next, the advantage by having arrange | positioned the permanent magnet 55 horizontally with respect to the rotor core 35 like this embodiment is demonstrated.

  If the permanent magnet 55 is not disposed, as shown in FIG. 13, when the rotor core 35 is magnetically saturated by the electromagnet magnetic flux, the axial (axial) electromagnetic force is also saturated. For this reason, in order to obtain a large electromagnetic force, the rotor core 35 must be thickened, which is not preferable because the magnetic bearing becomes large.

  On the other hand, when the permanent magnet 55 is disposed horizontally with respect to the rotor core 35 and no current is supplied to the electromagnets 43 and 45, the magnetic flux of the permanent magnet 55 is as shown in FIG. pass. That is, the magnetic flux of the permanent magnet 55 passes through the main magnetic path, while the leakage magnetic flux of the permanent magnet 55 passes through the rotor core 35 separately from the main magnetic path.

  Then, when an electric current is passed next to the electromagnets 43 and 45, an electromagnet magnetic flux is generated as shown in FIG. 15, and this electromagnet magnetic flux does not pass through the permanent magnet 55 having a low magnetic permeability and enters the rotor core 35. Therefore, in the rotor core 35, the electromagnet magnetic flux is offset with the leakage magnetic flux of the permanent magnet 55. Thus, since the leakage magnetic flux of the permanent magnet 55 has passed in the direction opposite to the main magnetic path, magnetic saturation is difficult.

As the electromagnet magnetic flux increases, the leakage magnetic flux of the permanent magnet 55 gradually disappears, and this leakage magnetic flux flows into the main magnetic path.
As a result, the rotor core 35 can be made thin, leading to a reduction in size and weight of the magnetic bearing. Moreover, since it becomes a high gap magnetic flux density, a high electromagnetic force can be generated.

  Next, an electromagnetic field analysis was performed in order to verify the effect associated with the arrangement of the permanent magnet 55. As shown in FIG. 16, the magnetic flux density and the axial electromagnetic force at two locations on the surface of the magnetic bodies 51 and 53 (shown as (A) in the figure) and inside the rotor core 35 (shown as (B) in the figure). Was obtained by analysis.

  FIG. 17 shows the relationship between the magnetic flux density on the surfaces of the magnetic bodies 51 and 53 and the electromagnet current when a permanent magnet (abbreviated as PM in the figure) is provided and when it is not provided. That is, when the permanent magnet 55 is not provided, a sign of magnetic saturation appears near the current 3A. On the other hand, in the case where the permanent magnet 55 is provided, no sign of magnetic saturation is observed even with the current 9A.

  FIG. 18 shows the relationship between the magnetic flux density in the rotor core and the electromagnet current when a permanent magnet is provided and when it is not provided. That is, as in the case of FIG. 17, in the case where the permanent magnet 55 is not provided, a sign of magnetic saturation appears near the current 3A. On the other hand, in the case where the permanent magnet 55 is provided, no sign of magnetic saturation is observed even with the current 9A. However, the magnetic flux density is negative when the current is 0 A because the leakage magnetic flux of the permanent magnet 55 exists.

  Further, FIG. 19 shows the relationship between the axial electromagnetic force and the electromagnet current when the permanent magnet is disposed and when it is not disposed. That is, in FIG. 17, when the permanent magnet 55 is not provided, it is about 0.58T when the current is 9A, whereas when the permanent magnet 55 is provided, it reaches 0.83T. It can be seen that the axial electromagnetic force increases from about 4200 N to 7200 N as shown in FIG.

Next, a third embodiment of the present invention will be described.
The conceptual block diagram of the magnetic bearing periphery of the solid-liquid separator 400 which is 3rd Embodiment of this invention is shown in FIG. The same elements as those in FIG. 1 and FIG. In FIG. 20, three electromagnet cores 29a, 29b, and 29c project from the lower surface of the stator core 29 in an annular shape around the rotation axis.

  Two annular slots 61, 63 are formed between the three electromagnet cores 29a, 29b, 29c. And an electromagnet is comprised by arrange | positioning coil | winding to these annular slots 61 and 63, the inner side of the electromagnet core 29a, and the outer side of the electromagnet core 29c, respectively. The direction of current is as shown in FIG.

  On the other hand, on the upper surface of the rotor core 35, magnetic bodies 71, 73, 75 project in a ring shape so as to face the electromagnet cores 29 a, 29 b, 29 c. And permanent magnets 85 and 87 are fixed between the magnetic bodies 71, 73 and 75. The permanent magnet 85 is installed in the horizontal direction and has an S pole on the inner side and an N pole on the outer side. The permanent magnet 87 is similarly installed in the horizontal direction, but unlike the permanent magnet 85, the inner side is configured as an N pole and the outer side is configured as an S pole.

  In such a configuration, the magnetic flux generated from the N poles of the permanent magnets 85 and 87 passes through the magnetic body 73 and then passes through the electromagnet core 29b, and then branches through the electromagnet core 29a and the electromagnet core 29c. Thereafter, the magnetic flux passing through the electromagnet core 29 a returns to the S pole of the permanent magnet 85 through the magnetic body 71. The magnetic flux that has passed through the electromagnet core 29 c returns to the S pole of the permanent magnet 87 via the magnetic body 75.

  Here, as the area of the electromagnet cores 29a, 29b, 29c and the area of the magnetic bodies 71, 73, 75 increase, the electromagnetic force in the axial direction increases by this area ratio. Further, more magnetic flux is generated around the electromagnet cores 29a, 29b, and 29c and around the magnetic bodies 71, 73, and 75 than in the second embodiment, and it has a stronger restoring force in the radial direction. it can. For this reason, even when the inner cylinder 25 is displaced in the radial direction, the support in the radial direction is further stabilized by this restoring force.

  Further, when the current flowing through the electromagnet is cut off, the magnetic flux generated by the electromagnet flowing through the closed magnetic path disappears. At this time, the magnetic field acting in the axial direction is extremely weakened, and the inner cylinder 25 falls due to its own weight and touches down the touch-down bearing 23.

  Further, in the solid-liquid separator 400 equipped with the magnetic bearing of the present embodiment, the magnetic flux flows through the closed magnetic path as in the second embodiment, so that the magnetic field does not affect the outside. For this reason, even if the undiluted solution flowing through the inner cylinder 25 is a magnetic material, it is not affected by the magnetic field.

  In the present embodiment, the number of annular slots is two, but the number is not limited to this.

The magnetic bearing of the solid-liquid separator 300 according to the second embodiment of the present invention was prototyped, and the magnetic support characteristics were measured and evaluated as follows.
First, four sets of electromagnets 43 and 45 were arranged around the rotation axis as one set. The winding resistance and inductance were measured in order to obtain the winding time constant necessary for controlling the magnetic bearing. Tables 1 and 2 show the measurement results of winding resistance and inductance, respectively.

  For inductance, the results of electromagnetic field analysis by the finite element method are also shown. Both the resistance and inductance are almost balanced by four electromagnets. In addition, the actual measured value of inductance is about 9% smaller than the analytical value, which seems to be due to the influence of leakage magnetic flux.

  A total of four gap sensors 44A, 44B, 44C, and 44D were attached to each electromagnet group, and a magnetic levitation test was performed. The experiment was performed with no load, and the weight of the rotating floating part at that time was 1,500N. It was confirmed that the magnetic support could be stably performed with a gap of 2.5 mm and an electromagnet current of 3 A during static levitation.

  FIG. 21 shows the result of analyzing the relationship between the electromagnet current and the electromagnetic force in the axial direction by the finite element method using the gap length as a parameter. FIG. 22 shows the relationship between the gap length and the electromagnetic current when the electromagnetic force is 1,500 N (constant). When the gap is 2.5 mm, the required electromagnet current is 3 A, and the measured value is in good agreement with the analysis value.

  Next, the rotating part of the magnetic bearing was rotated by belt transmission by external drive using a motor, and a rotational levitation test was performed. It was confirmed that the rotating part could be supported stably without touching down in the range of the rotational speed of 0-300 r / min.

The conceptual block diagram of the magnetic bearing periphery of the solid-liquid separator which is 1st Embodiment of this invention State of the lower surface of the stator core Top view of the rotor core Cross section of the stator side of the simplified model Cross section of the simplified model on the rotor side Materials and specifications used for simulation Simulation analysis results The conceptual block diagram of the magnetic bearing periphery of the solid-liquid separator which is 2nd Embodiment of this invention Cross section of the stator side of the simplified model Cross section of the simplified model on the rotor side Simulation analysis results Simulation analysis results When a permanent magnet is not installed on the rotor core When permanent magnets are installed on the rotor core (part 1) When permanent magnets are installed on the rotor core (part 2) Point where magnetic flux density and axial electromagnetic force were analyzed Relationship between magnetic flux density on magnetic surface and electromagnet current (with or without permanent magnet) Relationship between magnetic flux density in rotor core and electromagnet current (with or without permanent magnet) Relationship between axial electromagnetic force and electromagnet current (with or without permanent magnet) The conceptual block diagram of the magnetic bearing periphery of the solid-liquid separator which is 3rd Embodiment of this invention Results of analyzing the relation between electromagnetic current and electromagnetic force in the axial direction by the finite element method Relationship between gap length and electromagnetic current when electromagnetic force is constant Conceptual diagram of solid-liquid separator (horizontal type) Conceptual diagram of solid-liquid separator (vertical type) Structure of vertical solid-liquid separator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer cylinder 5, 25 Inner cylinder 6 Dividing rib board 7 Screw conveyor 9 Passage 11 Through hole 13 Feed port 17 Outlet 21 Outer cylinder 23 Touchdown bearing 29 Stator core 33, 43 Electromagnet 34, 44 Gap sensor 35 Rotor core 37, 55, 85, 87 Permanent magnet 49, 61 Annular slot 51, 71, 73, 75 Magnetic body 200, 300, 400 Solid-liquid separator

Claims (2)

A rotating core formed on a rotating body that rotates about a rotation axis;
A permanent magnet disposed on the rotating core and having a magnetic pole in the axial direction;
A plurality of electromagnets arranged opposite to the permanent magnets and having magnetic poles in the axial direction and evenly arranged around the rotation axis;
A stator core to which the electromagnet is attached;
A position sensor for detecting an axial position of the rotating body;
Axial position adjusting means for adjusting the axial position of the rotating body based on the position signal detected by the position sensor ;
A vertical solid-liquid separator equipped with a magnetic bearing device in which one permanent magnet is disposed in the axial direction,
The rotating body is an inner cylinder, and includes a screw driven at a speed different from that of the inner cylinder inside the inner cylinder,
Solid-liquid separation characterized in that solid and liquid are separated by passing a mixed stock solution of solid and liquid flowing in through a through-hole passing through the screw while rotating between the inner cylinder and the screw. Machine. A first closed magnetic path through which the magnetic flux generated by the electromagnet and the permanent magnet passes through the stator core, the inner cylinder side gap, the inner cylinder, and the rotating core;
The magnetic flux generated by the electromagnet and the permanent magnet is formed with the stator core, an outer cylinder connected to the stator core, an outer cylinder side gap, and a second closed magnetic path passing through the rotating core. The solid-liquid separator according to claim 1.

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