JP2005344589A - Canned motor pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small and compact canned motor pump while detecting the position of a rotor by using a Hall element. <P>SOLUTION: In this canned motor pump, the rotor 24 of a motor part 18 has a predetermined clearance S communicating with a pump part 20 between an outer ring part 36 and an inner ring part 38. A detecting magnet 58 is formed independently from a rare-earth permanent magnet 34, arranged on the inner peripheral side of a back yoke 32, and arranged corresponding to the clearance S between the outer ring part 36 and inner ring part 38 of the rotor 24. The Hall element 60 is extendedly arranged in the clearance S. Thereby, the clearance S is effectively utilized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a canned motor pump.

  A motor pump that drives an impeller (impeller) by a motor is known (see Patent Document 1 as an example).

  This type of motor pump includes a motor stator (coil) and a rotor (magnet rotor) and an impeller connected to the rotor. The impeller rotates at a high speed with the rotor. Liquid (pumped liquid) can be sucked and discharged, and is widely used as a water pump.

  Incidentally, the conventional motor pump as proposed in the above publication has a configuration using a Hall element (Hall IC) for detecting the position of the rotor. Accordingly, position detection can be performed even in a structure in which the rotor rotates in a sealed interior. For example, in order to maintain a predetermined discharge amount (flow rate), a voltage applied to the stator (coil) is suitable. Can be controlled.

However, in order not to be affected by the magnetic field (magnetic force) due to the stator coil (winding), or to be not affected by the liquid sucked or discharged (pumped liquid), the Hall element (rotation) It is necessary to dispose the position detection sensor unit) away from the coil (winding) and the impeller. For this reason, there has been a drawback that the physique of the apparatus becomes longer (larger) in the axial direction as a whole.
Japanese Patent Laid-Open No. 2003-201986

  An object of the present invention is to obtain a canned motor pump that can detect the position of a rotor by using a Hall element and can make the apparatus compact and compact in consideration of the above facts.

  A canned motor pump according to a first aspect of the present invention includes an armature stator in which a coil is wound around a stator core, a magnet rotor disposed radially inward of the armature stator, and one axial end. A housing case housing the armature stator on the inner peripheral side, and a pump part having an impeller which is located on the opposite side of the housing case and which is connected to the magnet rotor and rotates together with the magnet rotor The one end in the axial direction is continuous with the open side of the housing case and the other end in the axial direction is closed, and is disposed between the armature stator and the magnet rotor, and the armature stator is connected to the pump. A can that is isolated and sealed from a portion, a detection magnet attached to the magnet rotor, and the can And a rotation detecting means for detecting the rotational position of the magnet rotor, wherein the magnet rotor is a permanent magnet formed in a ring shape. An outer ring part configured to include an inner ring part provided with a predetermined gap communicating with the pump part on a radially inner side of the outer ring part, and the outer ring part and the inner ring part, And a connecting portion integrally formed with the impeller, and the detection magnet of the rotation detecting means is independent of the permanent magnet and is connected to the outer ring portion. Corresponding to the gap between the outer ring portion and the outer ring portion, the hall element of the rotation detecting means is arranged in a state of facing the detection magnet in the radial direction. The gap between the inner ring and the inner ring Extends is provided on, it is characterized in that.

  In the canned motor pump according to the first aspect, the rotation position of the magnet rotor is detected by the rotation detecting means having the detection magnet attached to the magnet rotor and the Hall element attached to the can side.

  Here, the detection magnet of the rotation detection means is arranged on the inner peripheral side of the outer ring portion independently of the permanent magnet of the magnet rotor and corresponding to the gap between the outer ring portion and the inner ring portion. Further, the Hall element of the rotation detecting means is provided so as to extend in a gap between the outer ring portion and the inner ring portion of the magnet rotor in a state of facing the detection magnet in the radial direction. That is, by arranging the detection magnet corresponding to the gap between the outer ring part and the inner ring part of the magnet rotor and extending the Hall element in the gap, the gap is effectively used. It has a configuration.

  Therefore, the gap between the outer ring part and the inner ring part of the magnet rotor inherently contributes to the weight reduction of the magnet rotor. The special arrangement space of the magnet and the hall element is not required, and the apparatus can be made small and compact.

  Moreover, since the gap provided between the outer ring portion and the inner ring portion of the magnet rotor communicates with the pump portion, the Hall element provided in the gap has a liquid (pumping) supplied by the pump portion. It is cooled by being in contact with the liquid (heat is released to the liquid). In addition, since the liquid in the gap flows with the rotation of the magnet rotor, the heat dissipation (cooling) of the Hall elements arranged in the gap is further improved. Therefore, unnecessary temperature rise can be suppressed even under severe external atmospheric temperature conditions, and predetermined detection accuracy can be maintained without using other expensive detection elements.

  A canned motor pump according to a second aspect of the present invention is the canned motor pump according to the first aspect, wherein the canned motor pump includes a back yoke that is formed in a ring shape by a magnetic body and is integrally fixed to the inner periphery of the permanent magnet, and The detection magnet of the rotation detection means is arranged on the inner periphery of the back yoke.

  In the canned motor pump according to the second aspect, the magnet for detection of the rotation detecting means is disposed on the inner periphery of the back yoke. That is, the back yoke is shared by the permanent magnet (for generating a magnetic field for driving the magnet rotor) and the detection magnet (for Hall element). Therefore, the rotational position of the magnet rotor can be reliably detected and the size can be reduced.

  According to a third aspect of the present invention, there is provided a canned motor pump comprising: an armature stator in which a coil is wound around a stator core; a magnet rotor disposed radially opposite to the armature stator; and one axial end A housing case housing the armature stator on the inner peripheral side, and a pump part having an impeller which is located on the opposite side of the housing case and which is connected to the magnet rotor and rotates together with the magnet rotor The one end in the axial direction is continuous with the open side of the housing case and the other end in the axial direction is closed, and is disposed between the armature stator and the magnet rotor, and the armature stator is connected to the pump. A can that is isolated and sealed from a portion, a detection magnet attached to the magnet rotor, and the can And a rotation detecting means for detecting the rotational position of the magnet rotor, wherein the magnet rotor is a permanent magnet formed in a ring shape. An outer ring part configured to include an inner ring part provided with a predetermined gap communicating with the pump part on a radially inner side of the outer ring part, and the outer ring part and the inner ring part, And a connecting portion integrally formed with the impeller, and the detection magnet of the rotation detecting means is provided integrally with the permanent magnet, and the rotation detecting means. The hall element is provided to extend in the gap between the outer ring portion and the inner ring portion in a state of facing the detection magnet in the radial direction.

  In the canned motor pump according to the third aspect, the rotation position of the magnet rotor is detected by the rotation detecting means having the detection magnet attached to the magnet rotor and the Hall element attached to the can side.

  Here, the detection magnet of the rotation detection means is provided integrally with the permanent magnet of the magnet rotor, and the Hall element of the rotation detection means is arranged on the outside of the magnet rotor in a state of facing the detection magnet in the radial direction. It extends in the gap between the ring portion and the inner ring portion. That is, the detection magnet provided integrally with the permanent magnet is disposed corresponding to the gap between the outer ring portion and the inner ring portion of the magnet rotor, and the Hall element is extended and provided in the gap. In this configuration, the gap is effectively used.

  Therefore, the gap between the outer ring part and the inner ring part of the magnet rotor inherently contributes to the weight reduction of the magnet rotor. The special arrangement space of the magnet and the hall element is not required, and the apparatus can be made small and compact.

  Moreover, since the gap provided between the outer ring portion and the inner ring portion of the magnet rotor communicates with the pump portion, the Hall element provided in the gap has a liquid (pumping) supplied by the pump portion. It is cooled by being in contact with the liquid (heat is released to the liquid). In addition, since the liquid in the gap flows with the rotation of the magnet rotor, the heat dissipation (cooling) of the Hall elements arranged in the gap is further improved. Therefore, unnecessary temperature rise can be suppressed even under severe external atmospheric temperature conditions, and predetermined detection accuracy can be maintained without using other expensive detection elements.

  A canned motor pump according to a fourth aspect of the present invention is the canned motor pump according to the third aspect, wherein the canned motor pump includes a back yoke that is formed in a ring shape by a magnetic body and is integrally fixed to the inner periphery of the permanent magnet, and The detection magnet of the rotation detecting means is provided so as to protrude in the axial direction from the axial end of the back yoke.

  In the canned motor pump according to the fourth aspect, the detection magnet of the rotation detecting means is integrally provided so as to protrude in the axial direction from the axial end portion of the back yoke. In other words, the permanent magnet (for generating a magnetic field for driving the magnet rotor) is provided in the outer ring portion of the magnet rotor, and the back yoke is provided by providing a detection magnet (for the hall element) integrally with the permanent magnet. It is the composition which shared. Therefore, the rotational position of the magnet rotor can be reliably detected and the size can be reduced.

  FIG. 1 is a sectional view showing the overall configuration of a canned motor pump 10 according to a first embodiment of the present invention.

  The canned motor pump 10 includes a motor housing 12 as a housing case. The motor housing 12 is made of resin and is formed in a cylindrical shape whose one end side in the axial direction is open, and further, a pump housing 16 made of resin is inserted through an O-ring 14 at the other end side in the axial direction (closed side end portion). It is connected. A motor portion 18 is provided in the motor housing 12, and a pump portion 20 is provided in the pump housing 16.

  The motor unit 18 includes a stator 22 (armature stator) and a rotor 24 (magnet rotor), and the stator 22 has windings (coils) wound around an iron core (stator core). The structure is arranged inside the motor housing 12.

  On the other hand, the rotor 24 of the motor unit 18 is located on the inner side of the stator 22 and is rotatably supported by a support shaft 26 attached to the pump housing 16 and a can 44 described later via a bearing 28. , It rotates around the support shaft 26.

  The rotor 24 is made of resin and includes an outer ring portion 36, an inner ring portion 38, and a connecting portion 40. The outer ring portion 36 has a substantially cylindrical shape as a whole, and the back yoke 32 and the rare earth permanent magnet 34 are integrally formed by molding. The back yoke 32 is formed in a ring shape as a whole by a magnetic material, while the rare earth permanent magnet 34 is also formed in a ring shape as a whole, and the rare earth permanent magnet 34 is integrally fixed to the outer periphery of the back yoke 32. It has been configured. Further, the outer ring portion 36 is integrally provided with a detection magnet 58 constituting rotation detection means by molding. The detection magnet 58 is configured independently of the rare earth permanent magnet 34 and is arranged on the inner peripheral side of the back yoke 32.

  Similarly, the inner ring portion 38 is also formed in a substantially cylindrical shape as a whole, and is provided with a predetermined gap S communicating with the pump portion 20 on the radially inner side of the outer ring portion 36. Furthermore, the connection part 40 has connected the outer ring part 36 and the inner ring part 38 in the axial direction one end part (right side of FIG. 1).

  As described above, the rotor 24 is configured to have a predetermined gap S between the outer ring portion 36 and the inner ring portion 38.

  The canned motor pump 10 includes a can 44. Like the rotor 24, the can 44 is formed of a resin material with one end in the axial direction (the left side end in FIG. 1) closed, and between the stator 22 and the rotor 24 of the motor unit 18. In addition, the other end portion (the right side end portion in FIG. 1) extends to the outer peripheral side of the stator 22 and is continuously integrated with the motor housing 12. Thereby, the can 44 isolates and seals the stator 22 from the rotor 24 and the pump unit 20.

  A hall element 60 that constitutes a rotation detecting means is provided on the closed side wall (left side wall in FIG. 1) of the can 44. The hall element 60 is provided so as to extend in the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 and is disposed in a state of facing the detection magnet 58 in the radial direction. .

  On the other hand, the pump unit 20 includes an impeller 52 that is integrally connected to the rotor 24 (connecting unit 40) of the motor unit 18, and the impeller 52 rotates together with the rotor 24, so that the pump unit 20 is lifted from the suction hole 54. The liquid is sucked and discharged from the discharge hole 56.

  Next, the operation of the first embodiment will be described.

  In the canned motor pump 10 configured as described above, the rotor 24 of the motor unit 18 has a predetermined gap S between the outer ring part 36 and the inner ring part 38. Further, the can 44 (and the motor housing 12) is disposed between the stator 22 and the rotor 24 of the motor unit 18 to isolate and seal the stator 22 from the rotor 24 and the pump unit 20. Further, in the clearance S provided between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 so as to communicate with the pump portion 20, the Hall element 60 constituting the rotation detecting means has a diameter on the detection magnet 58. It is extended and provided in the state which opposes a direction.

  In the canned motor pump 10, the rotational position of the rotor 24 is detected by a rotation detecting means having a detection magnet 58 attached to the rotor 24 (outer ring portion 36) and a hall element 60 attached to the can 44. Is done.

  Here, the detection magnet 58 of the rotation detecting means is independent of the rare earth permanent magnet 34 of the rotor 24 and corresponds to the gap S between the outer ring part 36 and the inner ring part 38. The hall element 60 of the rotation detecting means is arranged on the inner peripheral side (inner periphery of the back yoke 32), and the inner ring part 36 of the rotor 24 and the inner part of the rotor 24 are opposed to the detection magnet 58 in the radial direction. It extends to the gap S between the ring portion 38 and is provided. That is, by disposing the detection magnet 58 corresponding to the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 and extending the Hall element 60 in the gap S, the The gap S is effectively used.

  Therefore, the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 inherently contributes to the weight reduction of the rotor 24. However, by effectively using this gap S, The special arrangement space for the detection magnet 58 and the hall element 60 (rotation detection means) is not required, and the apparatus can be made small and compact.

  Moreover, since the gap S provided between the outer ring part 36 and the inner ring part 38 of the rotor 24 communicates with the pump part 20, the Hall element 60 provided in the gap S includes the pump part. It cools by contacting the liquid (pumped liquid) supplied by 20 (heat is radiated to the liquid). In addition, since the liquid in the gap S flows as the rotor 24 rotates, the heat dissipation (cooling) of the Hall element 60 disposed in the gap S is further improved. Therefore, unnecessary temperature rise can be suppressed even under severe external atmospheric temperature conditions, and predetermined detection accuracy can be maintained without using other expensive detection elements.

  Still further, the detection magnet 58 is disposed on the inner periphery of the back yoke 32, that is, the rare earth permanent magnet 34 (for generating a magnetic field for driving the rotor 24) and the detection magnet 58 (for the Hall element 60). ), The rotational position of the rotor 24 can be reliably detected and the size can be reduced.

  As described above, the canned motor pump 10 according to the first embodiment can use a Hall element 60 to detect the position of the rotor 24 and can be configured to be small and compact.

  Next, another embodiment of the present invention will be described.

  Note that components that are basically the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  FIG. 2 is a sectional view showing the overall configuration of a canned motor pump 70 according to the second embodiment of the present invention.

  The canned motor pump 70 has basically the same configuration as the canned motor pump 10 according to the first embodiment, but the back yoke 32 and the rare earth permanent magnet 72 are provided in the outer ring portion 36 of the rotor 24. Are integrally formed by molding. Further, the outer ring portion 36 is provided with a detection magnet 74 constituting rotation detection means. The detection magnet 74 is configured integrally with the rare earth permanent magnet 72 (configured as a single magnet), and the can 44 is closed along the axial direction from the axial end of the back yoke 32. It protrudes to the side (left side in FIG. 2).

  Further, a hall element 76 constituting a rotation detecting means is provided on the closed side wall (left side wall in FIG. 2) of the can 44. The hall element 76 is provided so as to extend in the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24, and is arranged in a state of facing the detection magnet 74 in the radial direction. .

  Next, the operation of the second embodiment will be described.

  In the canned motor pump 70 configured as described above, the Hall element 76 constituting the rotation detecting means is provided in the gap S provided between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 so as to communicate with the pump portion 20. Is extended in a state of facing the detection magnet 74 in the radial direction.

  In the canned motor pump 70, the rotation position of the rotor 24 is detected by a rotation detecting means having a detection magnet 74 attached to the rotor 24 (outer ring portion 36) and a hall element 76 attached to the can 44. Is done.

  Here, the detection magnet 74 of the rotation detection means is provided integrally with the rare earth permanent magnet 72 of the rotor 24, and the Hall element 76 of the rotation detection means faces the detection magnet 74 in the radial direction. In the state, it is provided to extend in the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24. That is, the detection magnet 74 provided integrally with the rare earth permanent magnet 72 is disposed corresponding to the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24, and a hole is provided in the gap S. By extending the element 76, the gap S is effectively used.

  Therefore, in the canned motor pump 70, the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 inherently contributes to the weight reduction of the rotor 24. As a result of the effective use of this, a special arrangement space for the detection magnet 74 and the Hall element 76 (rotation detection means) is not required, and the apparatus can be made compact and compact.

  In addition, since the gap S provided between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 communicates with the pump portion 20, the Hall element 76 provided in the gap S includes the pump portion. It cools by contacting the liquid (pumped liquid) supplied by 20 (heat is radiated to the liquid). Moreover, since the liquid in the gap S flows with the rotation of the rotor 24, the heat dissipation (coolability) of the Hall element 76 disposed in the gap S is further improved. Therefore, unnecessary temperature rise can be suppressed even under severe external atmospheric temperature conditions, and predetermined detection accuracy can be maintained without using other expensive detection elements.

  Furthermore, the detection magnet 74 protrudes in the axial direction from the axial end of the back yoke 32 and is provided integrally. That is, the rare earth permanent magnet 72 (for generating a magnetic field for driving the rotor 24) is provided in the outer ring portion 36 of the rotor 24. The rare earth permanent magnet 72 is integrated with the detection magnet 74 (Hall element). 76), the back yoke 32 is shared, so that the rotational position of the rotor 24 can be reliably detected, and this can also reduce the size.

  As described above, the canned motor pump 70 according to the second embodiment can be configured to be small and compact while using the Hall element 76 to enable the position of the rotor 24 to be detected.

It is sectional drawing which shows the whole structure of the canned motor pump which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the whole structure of the canned motor pump which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

        10 .... Canned motor pump, 12 .... Motor housing (housing case), 16 .... Pump housing, 18 .... Motor part, 20 .... Pump part, 22 .... Stator (armature stator), 24 ... Rotation Child (magnet rotor), 32 ... Back yoke, 34 ... Rare earth permanent magnet, 36 ... Outer ring part, 38 ... Inner ring part, 40 ... Connection part, 44 ... Can, 52 ... Impeller, 58 ..Detection magnet (rotation detection means), 60..Hall element (rotation detection means)

Claims (4)

An armature stator in which a coil is wound around the stator core;
A magnet rotor arranged to face the armature stator radially inside;
A housing case that is open at one end in the axial direction and that houses the armature stator on the inner periphery side;
A pump part located on the opposite side of the housing case from the open side, having an impeller coupled to the magnet rotor and rotating together with the magnet rotor;
One end in the axial direction is continuous with the open side of the housing case and the other end in the axial direction is closed, and is disposed between the armature stator and the magnet rotor. With a can that is isolated and sealed from,
A rotation detecting means having a detection magnet attached to the magnet rotor and a Hall element attached to the can side, and detecting a rotational position of the magnet rotor;
A canned motor pump comprising:
The magnet rotor is provided with an outer ring part including a permanent magnet formed in a ring shape and a predetermined gap communicating with the pump part on the radially inner side of the outer ring part. An inner ring part, and an outer ring part and an inner ring part are connected at one end in the axial direction and the impeller is integrally formed.
And the said detection magnet of the said rotation detection means is arrange | positioned in the inner peripheral side of the said outer ring part corresponding to the said clearance gap between the said outer ring part and an inner ring part while being independent of the said permanent magnet. The Hall element of the rotation detecting means is provided to extend in the gap between the outer ring portion and the inner ring portion in a state of facing the detection magnet in the radial direction.
A canned motor pump. A back yoke formed in a ring shape by a magnetic body and integrally fixed to the inner periphery of the permanent magnet,
And the detection magnet of the rotation detection means is disposed on the inner periphery of the back yoke,
The canned motor pump according to claim 1. An armature stator in which a coil is wound around the stator core;
A magnet rotor arranged to face the armature stator radially inside;
A housing case that is open at one end in the axial direction and that houses the armature stator on the inner periphery side;
A pump part located on the opposite side of the housing case from the open side, having an impeller coupled to the magnet rotor and rotating together with the magnet rotor;
One end in the axial direction is continuous with the open side of the housing case and the other end in the axial direction is closed, and is disposed between the armature stator and the magnet rotor. With a can that is isolated and sealed from,
A rotation detecting means having a detection magnet attached to the magnet rotor and a Hall element attached to the can side, and detecting a rotational position of the magnet rotor;
A canned motor pump comprising:
The magnet rotor is provided with an outer ring part including a permanent magnet formed in a ring shape and a predetermined gap communicating with the pump part on the radially inner side of the outer ring part. An inner ring part, and an outer ring part and an inner ring part are connected at one end in the axial direction and the impeller is integrally formed.
The detection magnet of the rotation detection means is provided integrally with the permanent magnet, and the Hall element of the rotation detection means is in contact with the outer ring portion in a state of facing the detection magnet in the radial direction. Provided to extend to the gap between the inner ring portion,
A canned motor pump. A back yoke formed in a ring shape by a magnetic body and integrally fixed to the inner periphery of the permanent magnet,
And the detection magnet of the rotation detecting means is provided to protrude in the axial direction from the axial end of the back yoke.
The canned motor pump according to claim 3.

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