JP2005330877A - Canned motor pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a canned motor pump which is operated without any trouble even when heat radiating capacity is increased and even under a sever external atmosphere condition, and compactly constructed. <P>SOLUTION: A canned motor pump 10 is formed that a rotor 24 of a motor part 18 has a given gap S between an outer ring part 36 and an inner ring part 38. A heat slinger 48 is mounted on the release end of a can 24 in a state to be opposed to an axial direction, and the heat slinger makes direct contact with liquid from a pump part 20. The gap of a rotor is provided by extending a radiating protrusion part 58 of the heat slinger 48 and the radiating protrusion part also makes direct contact with liquid from the pump part. When a control circuit element part 50 situated on the surface side of the heat slinger generates heat, the heat is radiated to liquid through the heat slinger and radiated to liquid also through the radiating protrusion part. Radiating capacity is increased and cooling performance is improved. Liquid in the gap flows along with rotation of the rotor, and the radiating nature of the radiating protrusion part is improved. The canned motor pump is operated without any trouble even under a sever temperature condition and can be compactly constructed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a canned motor pump.

  Among pumps driven by a motor, a canned motor pump having a configuration in which a stator of a motor is isolated and sealed from a pump unit is known.

  This type of canned motor pump is provided with a can (sealed container) between the stator (coil) and rotor (magnet) of the motor, and the stator is isolated and sealed from the pump portion by this can. Since there is no shaft seal and leakage of the pumped liquid does not occur, it is widely applied as a water pump or the like.

  By the way, the conventional canned motor pump applied as such a water pump is often used in a high-temperature atmosphere, and since a large output is required, power elements and capacitors of built-in drive circuits and control circuits are required. The fever becomes larger. For this reason, it may be difficult to drive for a long time under an environmental condition where the external ambient temperature is high. In particular, when it is desired to make the apparatus small and compact, heat generation of each component as described above (heat dissipation of the apparatus) has been a serious problem.

  Therefore, a motor having a configuration in which a metal plate (substrate) is disposed at the bottom of the apparatus casing and a circuit element or the like is mounted on the plate is proposed (see Patent Document 1 as an example). In the motor proposed in the above publication, heat generated in the circuit element is transmitted to the device casing through the metal plate material, and is radiated to the outside through the device casing, so that heat hardly accumulates inside the device. Heat dissipation is improved to some extent, and it becomes possible to cope with external ambient temperature conditions.

However, in such a configuration in which circuit elements or the like are simply mounted on a metal plate (substrate) and heat is radiated to the outside through the device casing, the heat radiation capacity may still be insufficient under severe operating conditions. In some cases, a canned motor pump in which the device casing is made of resin is difficult to apply, and further measures have been required.
JP 2003-299316 A

  In consideration of the above-mentioned facts, the present invention provides a canned motor pump that can operate without any trouble even under severe external ambient temperature conditions due to an increase in heat dissipation capacity, and can make the device compact and compact. Is the purpose.

  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 One end in the axial direction is continuous with the opposite side of the housing case from the open side and the other end in the axial direction is open, 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, and an open end of the can in a state facing the magnet rotor in an axial direction A heat sink attached and closing the open end; and a control circuit element provided on the surface side of the heat sink and applying a control current to the armature stator to rotate the magnet rotor. In the canned motor pump, the magnet rotor includes an outer ring portion configured to include a permanent magnet formed in a ring shape, and a predetermined communicating with the pump portion on a radially inner side of the outer ring portion. The inner ring portion provided with a gap, and the outer ring portion and the inner ring portion are connected at one end in the axial direction and the connecting portion integrally formed with the impeller, and the heat sink And a heat-dissipating protrusion provided to extend in the gap between the outer ring part and the inner ring part.

  In the canned motor pump according to claim 1, a heat radiating plate is attached to the open end of the can so as to face the magnet rotor in the axial direction so as to close the inside of the can, and the magnet rotor communicates with the pump portion. It rotates in a space sealed by a can and a heat sink. That is, the radiator plate is in direct contact with the liquid (pumped liquid) supplied by the pump unit.

  In addition, a heat radiating protrusion of the heat radiating plate is provided to extend in a gap provided in communication with the pump portion between the outer ring portion and the inner ring portion of the magnet rotor. That is, the heat radiating protrusion also directly contacts the liquid (pumped liquid) supplied by the pump unit.

  Therefore, when the control circuit element portion provided on the surface side of the heat sink generates heat, the heat is dissipated to the liquid via the heat sink (the heat sink is cooled), and the liquid is also supplied via the heat dissipation protrusion. Heat is dissipated (the heat dissipating protrusion is cooled).

  In this way, heat is not only radiated to the liquid by the heat radiating plate, but also is radiated to the liquid through the heat radiating protrusion (because the heat radiating protrusion is cooled), so the heat radiation capacity is increased and the cooling performance is improved. To do. Moreover, since the liquid in the gap provided in communication with the pump portion between the outer ring portion and the inner ring portion of the magnet rotor flows along with the rotation of the magnet rotor, the heat dissipated in the gap is disposed. The heat dissipation (cooling performance) of the protrusion is further improved.

  Therefore, it can operate without any trouble even under severe external ambient temperature conditions, and as a result, the apparatus can be made compact and compact.

  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 heat radiation protrusion of the heat radiation part is located on the back yoke side.

  In the canned motor pump according to the second aspect, the heat radiating protrusion of the heat radiating portion is located on the back yoke side opposite to the permanent magnet.

  Here, for example, when the heat dissipation protrusion is made of metal (for example, aluminum), if the heat dissipation protrusion is arranged close to the permanent magnet, an eddy current is generated in the heat dissipation protrusion due to the leakage magnetic flux, On the other hand, heat is generated.

  In this regard, in the canned motor pump according to claim 2, the unnecessary heat generation of the heat radiating protrusion does not occur.

  A canned motor pump according to a third aspect of the present invention includes an armature stator in which a coil is wound around a stator core and a permanent magnet formed in a ring shape, and the armature stator has a radially outer side. A magnet rotor arranged opposite to the housing, a housing case that opens at one end in the axial direction, accommodates the magnet rotor on the inner peripheral side, and is located on the side opposite to the opening side of the housing case and is connected to the magnet rotor A pump part having an impeller that rotates together with the magnet rotor, and one end in the axial direction opposite to the open side of the housing case is closed and the other end in the axial direction is open, the armature stator and the magnet rotor, Disposed between the can and for isolating and sealing the armature stator from the pump portion; A heat sink attached to the open end of the housing case and the can in a state of being opposed to the axial direction of the housing, and closing the open end, provided on the surface side of the heat sink, and for rotating the magnet rotor A canned motor pump including a control circuit element unit for applying a control current to the armature stator, wherein the magnet rotor has a predetermined gap communicating with the pump unit between the housing case and the magnet rotor. The heat dissipating plate is provided with a heat dissipating protrusion that extends in the gap between the magnet rotor and the housing case.

  In the canned motor pump according to claim 3, a heat radiating plate is attached to an open end of the housing case and the can so as to face the magnet rotor in an axial direction so as to close the inside of the housing case and the can. Rotate in a space communicating with the pump portion and sealed by a can and a heat sink in the housing case. That is, the radiator plate is in direct contact with the liquid (pumped liquid) supplied by the pump unit.

  In addition, a heat radiating protrusion of the heat radiating plate extends and is provided in a gap provided in communication with the pump portion between the magnet rotor and the housing case. That is, the heat radiating protrusion also directly contacts the liquid (pumped liquid) supplied by the pump unit.

  Therefore, when the control circuit element portion provided on the surface side of the heat sink generates heat, the heat is dissipated to the liquid via the heat sink (the heat sink is cooled), and the liquid is also supplied via the heat dissipation protrusion. Heat is dissipated (the heat dissipating protrusion is cooled).

  In this way, heat is not only radiated to the liquid by the heat radiating plate, but also is radiated to the liquid through the heat radiating protrusion (because the heat radiating protrusion is cooled), so the heat radiation capacity is increased and the cooling performance is improved. To do. Moreover, since the liquid in the gap provided in communication with the pump portion between the magnet rotor and the housing case flows with the rotation of the magnet rotor, the heat dissipation performance of the heat radiating protrusion arranged in this gap (Coolability) is further improved.

  Therefore, it can operate without any trouble even under severe external ambient temperature conditions, and as a result, the apparatus can be made compact and compact.

  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 an outer periphery of the permanent magnet, and The heat radiating protrusion of the heat radiating part is located on the back yoke side.

  In the canned motor pump according to the fourth aspect, the heat radiating protrusion of the heat radiating portion is located on the back yoke side opposite to the permanent magnet.

  Here, for example, when the heat dissipation protrusion is made of metal (for example, aluminum), if the heat dissipation protrusion is arranged close to the permanent magnet, an eddy current is generated in the heat dissipation protrusion due to the leakage magnetic flux, On the other hand, heat is generated.

  In this regard, in the canned motor pump according to the fourth aspect, the unnecessary heat generation of the heat radiating protrusion does not occur.

  A canned motor pump according to a fifth aspect of the present invention is the canned motor pump according to any one of the first to fourth aspects, wherein the heat radiating protrusion of the heat radiating portion is along a rotation direction of the magnet rotor. It is characterized by being formed into a plate shape.

  In the canned motor pump according to claim 5, even if the liquid in the gap where the heat dissipating protrusion is arranged flows with the rotation of the magnet rotor, the heat dissipating protrusion is formed in a plate shape along the rotation direction of the magnet rotor. Therefore, it is difficult to hinder the flow of the liquid, and therefore the heat radiation performance (cooling performance) of the heat radiation protrusion is further improved.

  A canned motor pump according to a sixth aspect of the present invention is the canned motor pump according to the fifth aspect, wherein the heat radiation projecting portion of the heat radiation portion is formed with a plurality of through holes penetrating the plate surface. It is said.

  In the canned motor pump according to the sixth aspect, since the liquid flows through the plurality of through holes (because the surface area of the heat radiating protrusion is increased), the heat radiating property (cooling property) is further improved.

  A canned motor pump according to a seventh aspect of the present invention is the canned motor pump according to the fifth aspect, wherein the heat radiating protrusion of the heat radiating portion protrudes from the plate surface and is formed with a plurality of fins along the circumferential direction. It is characterized by that.

  In the canned motor pump according to the seventh aspect, the liquid comes into contact with the plurality of fins (because the surface area of the heat radiating protrusions increases), so that the heat radiating property (cooling property) is further improved.

  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 via a bearing 28. Rotate around.

  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.

  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 further includes a can 44. Similarly to the rotor 24, the can 44 is formed of a resin material with one end in the axial direction being opened, and is disposed between the stator 22 and the rotor 24 of the motor unit 18, and the other end ( 1 is extended 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.

  In addition, a heat radiating plate 48 is connected to the rear end side (left side in FIG. 1) of the can 44 through an O-ring 46 so as to face the rotor 24 in the axial direction. The rotor 24 side is hermetically sealed. The heat radiating plate 48 is made of a metal having a high thermal conductivity (for example, aluminum) and further has a pair of heat radiating protrusions 58. The heat radiating protrusion 58 is formed in a plate shape along the rotation direction of the rotor 24, and is provided so as to extend into the gap S between the outer ring portion 36 and the inner ring portion 38 of the rotor 24. Yes. In addition, in this case, the heat radiating protrusion 58 is located on the back yoke 32 side of the back yoke 32 and the rare earth permanent magnet 34 molded integrally with the outer ring portion 36 described above.

  Further, a control circuit element unit 50 that applies a control current to the stator 22 in order to rotate the rotor 24 is provided on the surface side (left side in FIG. 1) of the heat radiating plate 48.

  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, a heat radiating plate 48 is attached to the open end of the can 44 so as to face the rotor 24 in the axial direction, and the inside of the can 44 is closed. The rotor 24 communicates with the pump unit 20 and can 44. And it rotates in the space sealed by the heat sink 48. That is, the heat sink 48 is in direct contact with the liquid (pumped liquid) supplied by the pump unit 20.

  Moreover, 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, a heat radiation protrusion 58 of the heat radiating plate 48 extends and is provided. Yes. That is, the heat radiating protrusion 58 is also in direct contact with the liquid (pumped liquid) supplied by the pump unit 20.

  Therefore, when the control circuit element unit 50 provided on the surface side of the heat radiating plate 48 generates heat, the heat is radiated to the liquid via the heat radiating plate 48 (the heat radiating plate 48 is cooled) and the heat radiating protrusion 58. The heat is also radiated to the liquid through (the heat radiating protrusion 58 is cooled).

  In this way, heat is not only radiated to the liquid by the heat radiating plate 48 but also radiated to the liquid through the heat radiating protrusion 58 (because the heat radiating protrusion 58 is cooled). Improves. Moreover, since the liquid in the gap S provided in communication with the pump portion 20 between the outer ring portion 36 and the inner ring portion 38 of the rotor 24 flows as the rotor 24 rotates, the gap The heat dissipating property (cooling property) of the heat dissipating protrusion 58 disposed in S is further improved.

  Further, since the heat radiating protrusion 58 of the heat radiating plate 48 is formed in a plate shape along the rotation direction of the rotor 24, the liquid in the gap S in which the heat radiating protrusion 58 is disposed causes the rotation of the rotor 24. Even if it flows with this, it is difficult to hinder the flow of the liquid, and the heat dissipation (cooling performance) of the heat dissipation protrusion 58 is further improved.

  Furthermore, in the canned motor pump 10, the heat radiating protrusion 58 of the heat radiating plate 48 is formed of the back yoke 32 of the back yoke 32 and the rare earth permanent magnet 34 molded integrally with the outer ring portion 36 of the rotor 24. It has a configuration located on the side.

  Here, for example, when the heat dissipation protrusion 58 is made of metal (for example, aluminum), if the heat dissipation protrusion 58 is disposed close to the rare earth permanent magnet 34, the heat dissipation protrusion 58 is swirled by the leakage magnetic flux. An electric current is generated and heat is generated instead.

  In this regard, in the canned motor pump 10 according to the first embodiment, the unnecessary heat generation of the heat radiating protrusion 58 does not occur and is efficient.

  Thus, the canned motor pump 10 according to the first embodiment can operate without any trouble even under severe external ambient temperature conditions due to an increase in heat dissipation capacity, resulting in a compact device. A compact configuration can be realized.

  In the first embodiment described above, the heat radiating plate 48 is provided with a pair of heat radiating protrusions 58, but the number of the heat radiating protrusions 58 is not limited to this. One (one) or three or more may be provided, and can be appropriately set in consideration of heat dissipation, flow resistance of liquid (pumped liquid), and the like.

  Further, in the first embodiment described above, the heat dissipation protrusion 58 is formed in a simple plate shape along the rotation direction of the rotor 24. However, the shape of the heat dissipation protrusion 58 is not limited to this. It is not limited.

  For example, it is good also as a structure in which the some through-hole 62 which penetrates a board surface was formed like the thermal radiation protrusion part 60 shown to FIG. 2 (A) and FIG. In such a heat radiating protrusion 60, since the liquid flows in the plurality of through holes 62 (because the surface area of the heat radiating protrusion 60 increases), the heat dissipation (cooling performance) is further improved. Further, for example, a plurality of fins 66 protruding from the plate surface and extending in the circumferential direction may be formed as in the heat dissipation protrusion 64 shown in FIG. In such a heat radiating protrusion 64, the liquid comes into contact with the plurality of fins 66 (because the surface area of the heat radiating protrusion 64 increases), so that the heat dissipation (cooling performance) is further improved.

  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. 4 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 basically has the same configuration as that of the canned motor pump 10 according to the first embodiment, but the canned motor pump 70 includes a stator 22 (an armature stator) of the motor unit 18 in the canned motor pump 10. The rotor 24 (magnet rotor) is arranged in a so-called “inside-out” manner.

  That is, the motor unit 18 of the canned motor pump 70 has a stator 72 (armature stator) and a rotor 74 (magnet rotor), and the stator 72 is located at the center portion (axial center portion) of the apparatus. It is fixedly arranged.

  On the other hand, the rotor 74 of the motor unit 18 is formed in a substantially cylindrical shape as a whole, and the back yoke 32 and the rare earth permanent magnet 34 are integrally formed by molding. In this case, the back yoke 32 is integrally fixed to the outer periphery of the rare earth permanent magnet 34, that is, unlike the first embodiment, the back yoke 32 is positioned radially outside.

  The rotor 74 is positioned opposite to the outer side (radially outer side) of the stator 72, and is a predetermined gap communicating with the pump unit 20 between the motor housing 12 (radially outer side). S is provided. An impeller 52 of the pump unit 20 is integrally connected to the rotor 74, and a support shaft 76 is attached to the impeller 52 and is rotatably supported via a bearing 78. , It rotates around the support shaft 76.

  As described above, the rotor 74 is positioned outside the stator 72 and has a predetermined gap S between the rotor 74 and the motor housing 12 (radially outward).

  Further, the canned motor pump 70 includes a can 80. The can 80 is formed such that one end in the axial direction opposite to the open side of the motor housing 12 is closed and the other end in the axial direction is open, and is disposed between the stator 72 and the rotor 74 of the motor unit 18. Thus, the stator 72 is isolated and sealed from the rotor 74 and the pump unit 20.

  In addition, a heat radiating plate 86 is connected to the open ends (on the left side in FIG. 4) of the motor housing 12 and the can 80 via an O-ring 82 and an O-ring 84 so as to face the rotor 74 in the axial direction. The inner side (the rotor 74 side) of the motor housing 12 and the can 80 is hermetically sealed. This heat radiating plate 86 has a pair of heat radiating protrusions 88 as in the first embodiment. The heat radiating protrusion 88 is formed in a plate shape along the rotation direction of the rotor 74, and is provided so as to extend into the gap S between the rotor 74 and the motor housing 12. In addition, in this case, the heat radiating protrusion 88 is located on the back yoke 32 side of the back yoke 32 and the rare earth permanent magnet 34 molded integrally with the rotor 74 described above.

  Furthermore, a control circuit element unit 50 that applies a control current to the stator 72 in order to rotate the rotor 74 is provided on the surface side (left side in FIG. 4) of the heat radiating plate 86.

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

  In the canned motor pump 70 configured as described above, the rotor 74 of the motor unit 18 has a predetermined gap S between the motor housing 12 and the rotor 74. Further, the can 80 (and the motor housing 12) is disposed between the stator 72 and the rotor 74 of the motor unit 18 to isolate and seal the stator 72 from the rotor 74 and the pump unit 20. Furthermore, a heat radiating plate 86 is attached to the open end of the can 80 so as to face the rotor 74 in the axial direction, and the inside of the motor housing 12 and the can 80 is closed. The rotor 74 is connected to the pump unit 20. It rotates in a space sealed by the communication can 80 and the heat radiating plate 86. That is, the heat sink 86 is in direct contact with the liquid (pumped liquid) supplied by the pump unit 20.

  Moreover, in the gap S provided between the rotor 74 and the motor housing 12 so as to communicate with the pump unit 20, a heat radiation protrusion 88 of the heat radiation plate 86 extends and is provided. That is, the heat radiating protrusion 88 is also in direct contact with the liquid (pumped liquid) supplied by the pump unit 20.

  Therefore, when the control circuit element unit 50 provided on the surface side of the heat radiating plate 86 generates heat, the heat is radiated to the liquid through the heat radiating plate 86 (the heat radiating plate 86 is cooled) and the heat radiating protrusion 88. The heat is also radiated to the liquid through (the heat radiating protrusion 88 is cooled).

  In this way, heat is not only radiated to the liquid by the heat radiating plate 86 but also radiated to the liquid through the heat radiating protrusion 88 (because the heat radiating protrusion 88 is cooled). Improves. In addition, since the liquid in the gap S provided between the rotor 74 and the motor housing 12 so as to communicate with the pump unit 20 flows as the rotor 74 rotates, the liquid is arranged in the gap S. The heat dissipation (cooling performance) of the heat dissipation protrusion 88 is further improved.

  Further, since the heat dissipation protrusion 88 of the heat dissipation plate 86 is formed in a plate shape along the rotation direction of the rotor 74, the liquid in the gap S in which the heat dissipation protrusion 88 is disposed is rotated by the rotor 74. Even if it flows together, it is difficult to prevent the liquid from flowing, and the heat dissipation (cooling performance) of the heat dissipation protrusion 88 is further improved.

  Further, in the canned motor pump 70, the heat radiating protrusion 88 of the heat radiating plate 86 is located on the back yoke 32 side of the back yoke 32 and the rare earth permanent magnet 34 molded integrally with the rotor 74. It has become. Therefore, unnecessary heat generation of the heat radiating protrusion 88 does not occur, which is efficient.

  As described above, the canned motor pump 70 according to the second embodiment can operate without any trouble even under severe external ambient temperature conditions due to increased heat dissipation capacity. As a result, the apparatus can be downsized. A compact configuration can be realized.

  Also in the second embodiment described above, the number of the heat radiating protrusions 88 of the heat radiating plate 86 can be appropriately set in consideration of the heat radiating property, the flow resistance of the liquid (pumped liquid), and the like.

  In the second embodiment described above, the heat dissipation protrusion 88 is formed in a simple plate shape along the rotation direction of the rotor 74, but the shape of the heat dissipation protrusion 88 is not limited thereto. Instead, the configuration may be such that a plurality of through-holes 62 are formed, or a configuration in which a plurality of fins 66 are formed, as in the first embodiment described above.

It is sectional drawing which shows the whole structure of the canned motor pump which concerns on the 1st Embodiment of this invention. The modification of the thermal radiation protrusion part provided in the heat sink of the canned motor pump which concerns on the 1st Embodiment of this invention is shown, (A) is sectional drawing, (B) is a top view. It is sectional drawing corresponding to FIG. 1 which shows the modification of the thermal radiation protrusion provided in the heat sink 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, 48 ... heat sink, 50 .. Control circuit element part, 52 .. Impeller, 58 .. Heat dissipation protrusion

Claims (7)

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 formed open. The armature stator is disposed between the armature stator and the magnet rotor. With a can that is isolated and sealed from,
A heat sink attached to the open end of the can in a state facing the magnet rotor in the axial direction and closing the open end;
A control circuit element unit that is provided on the surface side of the heat dissipation plate and applies a control current to the armature stator to rotate 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 heat dissipation plate has a heat dissipation protrusion provided to extend in the gap between the outer ring portion and 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 heat radiation protrusion of the heat radiation part is located on the back yoke side,
The canned motor pump according to claim 1. An armature stator in which a coil is wound around the stator core;
A magnet rotor that is configured to include a permanent magnet formed in a ring shape, and is arranged to face the outer side in the radial direction of the armature stator;
A housing case in which one end side in the axial direction is opened and the magnet rotor is accommodated on the inner peripheral 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 opposite to the open side of the housing case is closed and the other end in the axial direction is open, and is disposed between the armature stator and the magnet rotor, and the armature stator is connected to the pump portion. With a can that is isolated and sealed from,
A heat sink attached to the open end of the housing case and the can in a state facing the magnet rotor in the axial direction, and closing the open end,
A control circuit element unit that is provided on the surface side of the heat dissipation plate and applies a control current to the armature stator to rotate the magnet rotor;
A canned motor pump comprising:
The magnet rotor is provided with a predetermined gap communicating with the pump portion between the housing case,
And the heat dissipation plate has a heat dissipation protrusion provided to extend in the gap between the magnet rotor and the housing case.
A canned motor pump. A back yoke formed in a ring shape by a magnetic body and fixed integrally to the outer periphery of the permanent magnet,
And the heat radiation protrusion of the heat radiation part is located on the back yoke side,
The canned motor pump according to claim 3.   5. The canned motor pump according to claim 1, wherein the heat radiating protrusion of the heat radiating portion is formed in a plate shape along a rotation direction of the magnet rotor. .   The canned motor pump according to claim 5, wherein the heat radiating protrusion of the heat radiating portion is formed with a plurality of through holes penetrating the plate surface.   The canned motor pump according to claim 5, wherein the heat radiating protrusion of the heat radiating part is formed with a plurality of fins protruding from the plate surface along the circumferential direction.

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