JP5048365B2 - Vortex pump - Google Patents

Description

  The present invention relates to a vortex pump in which an impeller is formed integrally with a rotor.

  In the eddy current pump in which the impeller is formed integrally with the rotor, a magnet is mounted on the rotor so as to face the annular stator to constitute a motor mechanism. As such a motor mechanism, there are an inner rotor type in which a magnet is positioned on the inner peripheral side of the stator and an outer rotor type in which a magnet is positioned on the outer peripheral side of the stator. In comparison, it is possible to reduce the dimension in the axial direction in order to obtain the same torque, and there is an advantage that winding work is easy when the stator is configured.

As an eddy current pump provided with such an outer rotor type motor mechanism, a configuration in which a partition plate for partitioning a pump chamber is provided between the pump case (see Patent Documents 1, 2, and 3).
JP 2001-132699 A JP 2004-190562 A Japanese Patent Laid-Open No. 2003-161284

  However, in the eddy current pumps described in Patent Documents 1 and 2, since the rotation shaft can be extended only to a midway position in the thickness direction of the rotor, a force is easily applied to the rotor to incline it. There is a problem that it is easily worn out. Further, the vortex pump described in Patent Document 3 has a problem that the impeller comes into contact with the pump case even if the rotating shaft is slightly inclined because the rotating shaft is remarkably short compared to the outer diameter of the impeller. .

  In view of the above problems, an object of the present invention is to provide a vortex pump that can improve stability during rotation of a rotor by making maximum use of partition walls that define a pump chamber.

In order to solve the above problems, in the present invention, in the eddy current pump having an annular stator, a rotor including a magnet facing the stator, and an impeller formed integrally with the rotor, the magnet includes: A partition plate that opposes the stator on the outer peripheral side of the stator and defines a pump chamber in which the rotor is disposed between the stator and the pump case; and the partition plate is arranged in the direction of the rotation center axis of the rotor inside the stator. An inner cylindrical portion that protrudes from the base end edge of the inner cylindrical portion, and an outer peripheral edge of the annular connecting portion that protrudes to face the inner cylindrical portion, and the stator and the magnet and an outer tubular section interposed between said inner tubular portion includes a projection dimension throughout the rotation center axis line direction of the dimension of the stator, said inner tubular portion includes an inner Wherein the radial bearing supporting the rotation shaft of the rotor is held.

  In the present invention, since the outer rotor type in which the magnet is arranged on the outer peripheral side of the stator is adopted, the axial dimension can be reduced to obtain the same torque as compared with the inner rotor type, and the stator is configured. When doing this, the winding work is easy. In the case of the outer rotor type, a large force is applied to the rotating shaft of the rotor as much torque can be obtained. In the case of a vortex pump, a large force is applied to the rotating shaft of the rotor in the radial direction. Therefore, the rotor is particularly required to have stability during rotation. However, in the present invention, the partition plate is provided with an inner cylindrical portion that protrudes inside the stator, and at the inner side of the inner cylindrical portion with respect to the rotation axis of the rotor. Holds a radial bearing. For this reason, regarding the radial bearing, the entire thickness dimension (dimension in the axial direction) of the stator can be used as a space in which the radial bearing can be disposed, and the dimension in the axial direction of the radial bearing can be increased. Further, since the runout does not occur in the rotating shaft by the length of the radial bearing in the axial direction, the magnetic gap between the stator and the magnet does not fluctuate. Therefore, stability during rotation of the rotor can be improved.

  In this invention, it is preferable that the length dimension in the axial direction of the said radial bearing is 1/4 times or more of the outer diameter dimension of the said impeller. When the dimensions are set in this way, the rotation axis of the rotor can be supported over a long dimension, so that the stability during rotation of the rotor can be improved. Even when the rotation shaft is slightly inclined, the amount of displacement of the impeller is small, so that the problem that the impeller contacts the inner wall of the pump chamber does not occur.

  In the present invention, the pump case includes a side wall portion that surrounds the magnet on a radially outer side, and the partition plate is bent so as to contact both an inner peripheral surface of the side wall portion and a front end surface of the side wall portion. It is preferable to provide an annular step. If comprised in this way, a partition plate can be reliably positioned with high precision with respect to a pump case. Therefore, when both ends of the rotating shaft of the rotor are respectively supported by the partition plate and the pump case, the rotating shaft can be arranged in an upright posture, so that the stability during rotation of the rotor can be improved.

  In the present invention, since the outer rotor type is adopted in the eddy current pump, there is an advantage that a large torque can be obtained. On the other hand, a large force is applied to the rotating shaft of the rotor. While providing the inner cylinder part which protrudes inside, the radial bearing with respect to the rotating shaft of a rotor is hold | maintained inside this inner cylinder part. For this reason, regarding the radial bearing, the entire thickness dimension (dimension in the axial direction) of the stator can be used as a space in which the radial bearing can be disposed, and the dimension in the axial direction of the radial bearing can be increased. Further, since the runout does not occur in the rotating shaft by the length of the radial bearing in the axial direction, the magnetic gap between the stator and the magnet does not fluctuate. Therefore, stability during rotation of the rotor can be improved.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an appearance of a vortex pump to which the present invention is applied. FIGS. 2A and 2B are a perspective view showing a part of a vortex pump to which the present invention is applied, and a perspective view of a partition plate used in the vortex pump. FIGS. 3A and 3B are a longitudinal sectional view of an eddy current pump to which the present invention is applied and an enlarged sectional view in which a main part thereof is enlarged.

(Configuration of pump case 2 etc.)
As shown in FIGS. 1 and 2A, the vortex pump 1 of this embodiment has a rectangular parallelepiped shape as a whole, and has a structure in which a substrate 28 is covered on the upper surface of the pump case 2. An inflow pipe 23 and an outflow pipe 24 are formed adjacent to one of the four side faces of the pump case 2.

  As shown in FIGS. 1, 2 (a), and 3 (a), the pump case 2 includes a lower case 21 that constitutes the entire lower surface of the vortex pump 1, and the lower case 21 among the upper surfaces of the lower case 21. The lower case 21 and the lower case 21 are fixed by screws in the cylindrical portion 221. A cylindrical portion 217 (side wall portion) is formed on the upper surface of the lower case 21, while an annular step 227 is formed on the lower surface of the upper case 22, and the annular step 227 of the upper case 22 and the lower case 21 are formed. Liquid tightness between the upper case 22 and the lower case 21 is ensured by the O-ring 91 disposed between the base portion of the cylindrical portion 217. The board | substrate 28 is being fixed to the upper case 22 with the screw 281 with the partition board 6 mentioned later. The board 28 is a circuit board on which a driving IC 280 is mounted.

  As shown in FIGS. 1, 2 (a), 3 (a), and 3 (b), in the vortex pump 1 of this embodiment, a partition plate 6 is covered on the upper surface side of the pump case 2. A pump chamber 10 in which the rotor 3 is disposed is partitioned between the pump case 2 and the pump case 2. Therefore, the pump chamber 10 is surrounded by the upper surface of the lower case 21, the upper case 22, and the lower surface of the partition plate 6.

(Configuration of rotor 3)
The rotor 3 includes an impeller component 30 and a back yoke 32 fixed to the upper surface of the impeller component 30. The impeller component 30 includes a cylindrical part 35 into which the rotating shaft 31 is fitted, and a cylindrical part. A disk portion 36 having a diameter increased from the outer peripheral wall 35 and an impeller 37 formed on the outer peripheral edge of the disk portion 36 are provided. The back yoke 32 includes a bottom plate portion in which a hole for fitting the cylindrical portion 35 of the impeller component 30 is formed, and a cylindrical portion that rises upward in the axial direction from the outer peripheral edge of the bottom plate portion, and an inner peripheral surface of the cylindrical portion A magnet 33 is fixed to the magnet. The upper case 22 is formed with a large-diameter cylindrical portion 228, and the magnet 33 is opposed to the cylindrical portion 228 with a predetermined gap.

(Configuration of partition plate 6)
As shown in FIGS. 2A and 2B and FIGS. 3A and 3B, the partition plate 6 is a non-magnetic plate that is deep-drawn into a cup shape that opens upward as a whole. . In this embodiment, the partition plate 6 includes a bottomed cylindrical inner cylinder portion 61 that protrudes upward in the axial direction at the center position, an annular connecting portion 62 that has a diameter increased from the base edge of the inner cylinder portion 61, The outer cylinder part 63 protruded cylindrically so that it might oppose the inner cylinder part 61 from the outer periphery of the cyclic | annular connection part 62 was provided. The magnet 33 is opposed to the outside of the outer cylinder portion 63 with a predetermined gap.

  Further, the partition plate 6 includes an annular flange portion 64 whose diameter increases from the upper end edge of the outer cylindrical portion 63, and an annular step portion 65 is formed in the annular flange portion 64. The partition plate 6 is positioned in the pump case 2 with the annular step portion 65 contacting the upper end portion of the inner surface of the cylindrical portion 228 of the upper case 22 and the upper end surface of the cylindrical portion 228. A circumferential groove 229 is formed on the upper end surface of the cylindrical portion 228 of the upper case 22, and an O-ring 92 disposed in the circumferential groove 229 contacts the outer peripheral portion 66 of the annular flange portion 64 of the partition plate 6. Liquid contact is ensured by contact.

(Configuration of stator 5)
As shown in FIGS. 2A, 3A, and 3B, in the partition wall plate 6, a bottomed cylindrical holder 7 is attached to the inner cylinder portion 61 from above. The holder 7 includes an upper bottom portion 71 that covers the upper side of the inner cylindrical portion 61, a lower cylindrical portion 72 that protrudes from the outer peripheral edge of the upper bottom portion 71 downward in the axial direction and covers the inner cylindrical portion 61 of the partition plate 6, And an upper cylinder portion 73 protruding upward in the axial direction from the center of the upper bottom portion 71, and the upper cylinder portion 73 protrudes further upward from the upper surface of the substrate 28.

  An annular stator 5 is fixed around the lower cylindrical portion 62 of the holder 7. The stator 5 includes a stator core 52 in which a plurality of salient poles projecting toward the outer peripheral side are formed at equal angular intervals, and a coil 51 wound around each of the plurality of salient poles. The part is electrically connected to the substrate 28. In this state, the stator 5 is arranged in an annular groove formed between the inner cylinder portion 61 and the outer cylinder portion 63 in the partition plate 6, and the outer peripheral side thereof is surrounded by the outer cylinder portion 63 of the partition plate 6. It will be in the state. Therefore, the magnet 33 is opposed to the outer peripheral surface of the stator 5 via the outer cylindrical portion 63 of the partition plate 6 to constitute an outer rotor type motor mechanism.

  The upper cylindrical portion of the holder 7 is formed with a male screw. When the nut 285 is fixed to the upper cylindrical portion and the substrate 28 is fixed to the upper case 22 by the screw 281, the partition plate 6 and the substrate 28 are interposed. The holder 7 is fixed, and the stator 5 is held between the substrate 28 and the partition plate 6 via the holder 7.

(Configuration of radial bearing)
In the vortex pump 1 of this embodiment, a concave portion 216 is formed at the center of the lower case 21, and a radial bearing 81 that rotatably supports the rotating shaft 31 of the rotor 3 is held therein.

  A radial bearing 82 that rotatably supports the rotating shaft 31 of the rotor 3 is also held in the inner cylinder portion 61 of the partition plate 6. Here, the inner cylindrical portion 61 of the partition plate 6 has a projecting dimension that is higher as the entire thickness dimension (axial dimension / height dimension) of the stator 5 is increased, and therefore, the axial direction of the radial bearing 82 is increased. The dimension (length dimension L) is long. Therefore, in this embodiment, a radial bearing 82 having a length dimension L of 1/4 or more of the outer diameter dimension D of the impeller 37 is used.

  Further, as the radial bearings 81 and 82, those having high slidability such as carbon are used.

(Assembly method of vortex pump 1)
In order to assemble the vortex pump 1 of this embodiment, the holder 7 and the stator 5 are mounted on the partition plate 6, and a radial bearing 82 is fixed to the inner cylindrical portion 61 of the partition plate 6. Then, the partition plate 6 and the upper case 22 are overlapped via the O-ring 92, and the substrate 28 is stacked on the partition plate 6, and in this state, the substrate 28 is fixed to the upper case 22 with screws 281. Further, the nut 285 is fixed to the upper cylindrical portion 73 protruding from the substrate 28 in the holder 7. As a result, the upper case 22, the partition plate 6, the holder 7, the stator 5 and the substrate 28 are integrated. Next, the upper end portion of the rotating shaft 31 of the rotor 3 is inserted into the radial bearing 82 fixed to the inner cylinder portion 61 of the partition plate 6. As a result, the outer cylindrical portion 63 of the partition plate 6 is interposed between the stator 5 and the magnet 33 of the rotor 3 located on the outer peripheral side of the stator 5. In this state, a magnetic attractive force acts between the magnet 33 of the rotor 3 and the stator 5, so that the rotating shaft 31 does not come out of the radial bearing 82 without particularly preventing the removal.

  On the other hand, the radial bearing 81 is fixed to the recess 216 of the lower case 21, and the upper case is fitted so that the lower end portion of the rotating shaft 31 of the rotor 3 held on the partition plate 6 side fits in the hole of the radial bearing 81. 22 is stacked on the lower case 21. Then, the upper case 22 and the lower case 21 are fixed by fastening screws within the cylindrical portion 221. At that time, an O-ring 91 is attached to the base of the cylindrical portion 217 protruding upward from the lower case 21. As a result, the O-ring is sandwiched between the annular step portion 227 of the upper case 22 and the base portion of the cylindrical portion 217 of the lower case 21, and liquid tightness is ensured at this portion.

(Operation and main effects of this form)
In the vortex pump 1 configured as described above, when the rotor 3 rotates, the impeller 37 rotates in the pump chamber 10, and the liquid sucked from the inflow pipe 23 is discharged from the outflow pipe 24. Here, since the eddy current pump 1 is an outer rotor type in which the magnet 33 is disposed on the outer peripheral side of the stator 5, the axial dimension is reduced to obtain the same torque as compared with the inner rotor type. In addition, when the stator 5 is configured, the coil 51 can be easily wound.

  However, in the case of the outer rotor type, a large force is applied to the rotating shaft 31 of the rotor 3 because a large torque can be obtained. In the case of the vortex pump 1, a large force is applied to the rotating shaft 31 of the rotor 3 in the radial direction. Therefore, the rotor 3 is particularly required to be stable during rotation. In this embodiment, the partition plate 6 is provided with an inner cylindrical portion 61 that protrudes inside the stator 5, and inside the inner cylindrical portion 61. A radial bearing 82 for the rotating shaft 31 of the rotor 3 is held. For this reason, the radial bearing 82 can be used as a space in which the radial bearing 82 can be arranged over the entire thickness dimension (axial dimension) of the stator 5, and the radial bearing 82 can be elongated in the axial direction. Further, since the deflection of the rotary shaft 31 does not occur as much as the dimension of the radial bearing 82 in the axial direction is increased, the magnetic gap between the stator 5 and the magnet 33 does not fluctuate. Therefore, the stability during rotation of the rotor 3 can be improved.

  Further, the length L in the axial direction of the radial bearing 82 is not less than ¼ times the outer diameter D of the impeller 37, and the rotary shaft 31 of the rotor 3 can be supported by the radial bearing 82 over a long dimension. Therefore, the stability during rotation of the rotor 3 can be improved. Further, since the rotation shaft 31 is long, even when the rotation shaft 31 is slightly inclined, the displacement amount of the impeller 37 is small, so that the problem that the impeller 37 contacts the inner wall of the pump chamber 10 does not occur.

  Further, the pump case 2 includes a cylindrical portion 228 (side wall portion) having an inner peripheral surface surrounding the magnet 33 on the outer side in the radial direction, and the partition plate 6 includes an inner peripheral surface of the cylindrical portion 228 and an upper end surface of the cylindrical portion 228. An annular stepped portion 65 that is bent so as to abut both of the (tip surface) is provided. Therefore, the partition plate 6 can be reliably positioned with high accuracy with respect to the pump case 2. Therefore, when both ends of the rotating shaft 31 of the rotor 3 are supported by the partition plate 6 and the pump case 2, respectively, the rotating shaft 31 can be arranged in an upright posture, so that the stability during rotation of the rotor 3 is improved. Can be improved.

[Other forms]
In the above embodiment, the rotary shaft 31 is supported by the radial bearings 81 and 82 in a cantilever state. However, a structure in which the rotary shaft 31 is supported by the radial bearing 82 only in a cantilever state may be employed. In addition, the radial bearing 82 is an integral one, but a portion that is divided into two in the axial direction may be used as the radial bearing 82.

  The driving IC 280 preferably employs a structure in which heat is released to liquid via the substrate 28 and the partition plate 6 and indirectly cooled.

It is a perspective view which shows the external appearance of the vortex pump to which this invention is applied. (A), (b) is a perspective view which cuts and shows a part of eddy current pump to which this invention is applied, respectively, and a perspective view of the partition plate used for this eddy current pump. (A), (b) is the longitudinal cross-sectional view of the eddy current pump to which this invention is applied, respectively, and the expanded sectional view which expanded the principal part.

Explanation of symbols

1 .. Eddy current pump 2 .. Pump case 3 .. Rotor 5 .. Stator 6 .. Bulkhead plate 7 .. Holder 10 .. Pump chamber 21 .. Lower case 22 .. Upper case 31. Magnet 37 ·· Impeller 61 · · Inner tube portion 63 of the partition plate · · Outer tube portion 65 of the partition plate · · An annular step portion 82 of the partition plate · · A radial bearing held by the partition plate

Claims (3)

In an eddy current pump having an annular stator, a rotor having a magnet facing the stator, and an impeller formed integrally with the rotor,
The magnet faces the stator on the outer peripheral side of the stator,
A partition plate that partitions the pump chamber in which the rotor is disposed between the pump case and
The partition plate includes an inner cylindrical portion that protrudes in the direction of the rotation center axis of the rotor inside the stator, an annular connecting portion that is expanded from the base end edge of the inner cylindrical portion, and an outer peripheral edge of the annular connecting portion. An outer cylinder that protrudes to face the inner cylinder and is interposed between the stator and the magnet;
The inner cylindrical portion has a projecting dimension over the entire dimension of the stator in the rotation center axis direction,
Wherein the inner tubular portion, vortex flow pump, wherein a radial bearing for supporting the rotation shaft of the rotor on the inside are held.   2. The eddy current pump according to claim 1, wherein a length dimension of the radial bearing in an axial direction is not less than ¼ times an outer diameter dimension of the impeller. The pump case includes a side wall portion that surrounds the magnet on the outer side in the radial direction,
3. The vortex pump according to claim 1, wherein the partition plate includes an annular step portion that is bent so as to contact both an inner peripheral surface of the side wall portion and a tip end surface of the side wall portion. .

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