JP2008133790A - Fluid pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a foreign substance from entering in a motor part. <P>SOLUTION: In the fluid pump device 10, an axial width W1 of a radial passage 56 axially between a bottom part 36a of a motor housing and a bottom part 32b of a rotor 32 is set wider than a radial width W2 of a first axial passage 54 radially between a cylinder part 28a of a can 28 and an outer circumference part 32a of the rotor 32 and a radial width W3 of a second axial passage 58 radially between an outer circumference part 30a of a rotation shaft 30 and an inner circumference part 46a of a bearing member 46, and the radial passage 56 is structured as a foreign substance reservoir. A plurality of blades 62 for generating swirling current 64 in fluid entering in the radial passage 56 are provided at a bottom part 32b of the rotor 32. Thus, it is possible to surely accumulate foreign substance in the radial passage 56 and prevent the foreign substance from entering radially between the outer circumference part 30a of the rotation shaft 30 and the inner circumference part 46a of the bearing member 46. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluid pump device, and more particularly to a fluid pump device having a structure for preventing foreign matters in a fluid flowing into a pump chamber from entering a motor unit.

  In general, foreign matter is mixed in the cooling water for cooling the engine of the automobile. In the fluid pump device that feeds this cooling water, a structure for preventing the entry of the foreign matter into the motor unit is adopted. ing. Examples of this type of structure include the following (see, for example, Patent Document 1 and Patent Document 2).

  For example, in the example of the water pump described in Patent Document 1, a replaceable filter member is provided in the liquid inlet passage for guiding the coolant to the impeller of the pump housing. This filter member is configured to prevent foreign matter from entering a mechanical seal that seals between the pump housing and the impeller.

Moreover, in the example of the magnetic coupling pump described in Patent Document 2, a concave portion is formed on the end surface of the impeller, and a part of the rotor magnet is exposed from the concave portion. And it is comprised so that the foreign material in a fluid may be adsorb | sucked by a part of rotor magnet exposed from this recessed part, and this foreign material may be accommodated in a recessed part.
Japanese Utility Model Publication No. 6-58194 JP-A-9-49496 JP 2005-330877 A Japanese Patent Laid-Open No. 2005-214099 JP 2003-83277 A

  However, in the example of the water pump described in Patent Document 1, there is a disadvantage that the filter member needs to be periodically replaced, and that maintenance is complicated.

  Further, the example of the magnetic coupling pump described in Patent Document 2 has a disadvantage that the amount of effective magnetic flux required for driving the motor is reduced by adsorbing foreign matter to the rotor magnet for driving the motor. In order to prevent this, it is conceivable to add a magnet for adsorbing the mixed foreign matter. However, in this case, the cost increases with the addition of members. In addition, there is a disadvantage that foreign matters that are not attracted to the magnet cannot be excluded.

  The present invention has been made in view of the above problems, and the object thereof is to reliably prevent foreign matters in the fluid flowing into the pump chamber from entering the motor unit with a simple configuration. Is to provide a simple fluid pump device.

  The fluid pump device according to claim 1, wherein the pump unit includes a pump-side housing that forms a pump chamber communicating with the suction port and the discharge port, and an impeller that is rotatably disposed in the pump chamber. A motor-side housing having a bottomed cylindrical partition wall having an opening on the pump chamber side and forming a motor chamber communicating with the pump chamber, and a rotation provided in the motor chamber along the axial direction A shaft, a rotor rotatably supported on the rotating shaft via a bearing member and disposed in the motor chamber and connected to the impeller so as to rotate together with the impeller, and a radially outer side of the cylindrical portion of the partition wall portion And a motor portion having a stator provided to face the rotor in the radial direction, and the fluid in the pump chamber is caused to flow along the cylindrical portion of the partition wall as the impeller rotates. When A first axial passage between the outer periphery of the rotor and a radial passage between the bottom of the partition and the bottom of the rotor, and an outer periphery of the rotating shaft and the bearing member. In the fluid pump device in which a bearing circulation flow returning to the pump chamber is formed via a second axial passage between the inner peripheral portion and the radial direction, the axial width of the radial passage is the first axial passage. And a width wider than the radial width of the second axial passage, and is provided at the bottom of the rotor so as to be rotatable in the radial passage and for fluid flowing into the radial passage. There is provided eddy current generating means for generating a vortex accompanying the rotation of the rotor.

  In the fluid pump device according to claim 1, when the rotor is rotated by the rotating magnetic field applied from the stator, the impeller is rotated, and the fluid is sucked into the pump chamber from the outside via the suction port. Is discharged to the outside through the discharge port. As the impeller rotates, the fluid in the pump chamber causes a first axial passage between the cylindrical portion of the partition wall and the outer periphery of the rotor in the radial direction, and the axial direction between the bottom of the partition wall and the bottom of the rotor. A bearing circulation flow returning to the pump chamber is formed through the radial passage between them and the second axial passage between the outer peripheral portion of the rotating shaft and the inner peripheral portion of the bearing member.

  By the way, when the fluid pump device according to claim 1 is used in, for example, an engine cooling system of an automobile, foreign matters such as cast sand enter the engine cooling water when the engine is new and the like, and enter the pump chamber of the fluid pump device. Will be carried to.

  Here, in the fluid pump device according to claim 1, the axial width of the radial passage between the bottom part of the partition wall part and the bottom part of the rotor in the axial direction is such that the cylindrical part of the partition wall part and the outer peripheral part of the rotor part. The radial width of the first axial passage between the radial directions and the radial width of the second axial passage between the outer peripheral portion of the rotating shaft and the inner peripheral portion of the bearing member are set wider than the radial width. The radial passage between the bottom of the partition wall and the bottom of the rotor in the axial direction functions as a foreign substance reservoir. For this reason, the foreign material mixed in the above-mentioned bearing circulation flow can be stored in this radial passage.

  In addition, vortex flow generating means is provided at the bottom of the rotor so as to be rotatable in the above-described radial passage and to generate a vortex in the fluid flowing into the radial passage as the rotor rotates. Therefore, when the rotor is rotated, a vortex is formed in the fluid in the radial passage by the vortex generating means described above, so that the foreign matter mixed in the fluid in the radial passage is in the second position ahead of the radial passage. It can prevent going to an axial direction channel | path, and can accumulate | store this foreign material in a radial direction channel | path reliably. Thereby, it can prevent that a foreign material enters between the radial directions of the outer peripheral part of a rotating shaft, and the inner peripheral part of a bearing member.

  Thus, according to the fluid pump device of the first aspect, the mixed foreign matter in the fluid that has flowed into the pump chamber causes the motor part (particularly, the radial direction between the outer peripheral part of the rotating shaft and the inner peripheral part of the bearing member). ) Can be reliably prevented with a simple configuration.

  A fluid pump device according to a second aspect is the fluid pump device according to the first aspect, wherein the vortex generating means is provided in a plurality of radial directions from the radially inner side to the radially outer side at the bottom of the rotor. It is characterized by comprising blades.

  According to the fluid pump device of the second aspect, the above-described vortex generating means is constituted by a plurality of blades provided radially at the bottom of the rotor from the radially inner side toward the radially outer side. Accordingly, as the rotor rotates, a vortex can be reliably generated in the fluid that has flowed into the radial passage described above, and foreign matter can be generated between the outer peripheral portion of the rotating shaft and the inner peripheral portion of the bearing member. It can be surely prevented from entering.

  A fluid pump device according to a third aspect of the present invention is the fluid pump device according to the first or second aspect, wherein the impeller is configured to convey the fluid in the pump chamber radially outward with rotation. In addition, the outer diameter is set larger than the inner diameter of the partition wall.

  According to the fluid pump device of the third aspect, when the impeller rotates, the fluid in the pump chamber is conveyed radially outward with the rotation of the impeller. Here, the outer diameter of the impeller is set larger than the inner diameter of the partition wall. Accordingly, the foreign matter mixed in the fluid in the pump chamber can be conveyed from the radially outermost portion of the partition wall to the radially outer side, and a large kinetic energy is imparted to the foreign matter to convey the foreign matter radially outward. can do. As a result, foreign matter mixed into the fluid in the pump chamber can be reliably prevented from entering the first axial passage between the cylindrical portion of the partition wall portion and the outer peripheral portion of the rotor from the pump chamber. Can be more reliably prevented from entering between the radial direction of the outer peripheral part of the rotating shaft and the inner peripheral part of the bearing member.

  The fluid pump device according to claim 4 is the fluid pump device according to any one of claims 1 to 3, wherein a gap between the impeller communicating with the pump chamber and the partition portion is The opening direction is set in a direction opposite to the direction in which the fluid is conveyed by the impeller.

  According to the fluid pump device of the fourth aspect, the clearance between the impeller communicating with the pump chamber and the partition wall is set such that the opening direction is opposite to the direction in which the fluid is conveyed by the impeller. That is, for example, when the direction in which the fluid is conveyed by the impeller is the radially outer side of the fluid pump device, the opening direction of the gap between the impeller communicating with the pump chamber and the partition wall portion is the diameter of the fluid pump device. It will be set inside the direction. As a result, foreign matter mixed in the fluid in the pump chamber can be reliably prevented from entering the first axial passage from the gap between the impeller communicating with the pump chamber and the partition wall, and as a result, the foreign matter can be prevented from entering the outer periphery of the rotating shaft. It can prevent still more reliably that it enters between the radial directions of a part and the inner peripheral part of a bearing member.

  First, the configuration of the fluid pump device 10 according to an embodiment of the present invention will be described.

  FIG. 1 is a side sectional view showing an overall configuration of a fluid pump device 10 according to an embodiment of the present invention, and FIGS. 2 and 3 are enlarged views of main parts of the fluid pump device 10 according to an embodiment of the present invention. Cross-sectional views are shown respectively. 4 and 5 show a side view and a bottom view of the impeller 26 and the rotor 32 provided in the fluid pump device 10 according to the embodiment of the present invention, respectively.

  A fluid pump device 10 according to an embodiment of the present invention is preferably used as, for example, an electric water pump for an automobile engine cooling device, and includes a pump unit 12 provided on one side in the axial direction, and an axial direction. And a motor unit 14 provided on the other side.

  The pump unit 12 includes a pump housing 16 as a pump-side housing configured in a substantially concave disk shape. The inside of the concave portion of the pump housing 16 is configured as a pump chamber 18. The pump housing 16 is provided with a suction port 20 along the axial direction at the center thereof, and with a discharge port 22 extending in the tangential direction at the radially outer portion thereof. Both the suction port 20 and the discharge port 22 are in communication with the pump chamber 18.

  Further, an impeller 26 having a plurality of blades 24 is rotatably disposed in the pump chamber 18. The impeller 26 is configured to suck fluid from the suction port 20 as it rotates and to transport the fluid in the pump chamber 18 radially outward (X1 side) and discharge the fluid from the discharge port 22 to the outside.

  The motor unit 14 includes a can 28 and a motor housing 36 as a motor-side housing, a rotating shaft 30, a rotor 32, a stator 34, and a control circuit 38. The pump unit 12 described above. It is assembled integrally with.

  The can 28 is configured in a cylindrical shape having an opening 40 on the pump chamber 18 side, and the inside of the can 28 is configured as a motor chamber 42 communicating with the pump chamber 18. The can 28 isolates and seals a later-described stator 34 from the motor chamber 42. As shown in FIG. 2, the inner diameter φ1 of the can 28 is set to be smaller than the outer diameter φ2 of the impeller 26 (φ2> φ1).

  The rotary shaft 30 is supported by a support portion 44 provided at the center of the bottom of the motor housing 36, and is provided in the pump chamber 18 along the axial direction. The rotor 32 is rotatably supported on the rotary shaft 30 via a bearing member 46 and is disposed in a motor chamber 42 on the radially inner side of the can 28. The rotor 32 is provided with a rotor magnet 48 in an annular shape on the outer side in the radial direction than the rotary shaft 30. The rotor 32 is provided integrally with the impeller 26 described above.

  The stator 34 is provided on the radially outer side of the cylindrical portion 28 a of the can 28 so as to face the rotor 32 in the radial direction. The stator 34 is configured such that a winding 52 is attached to a core 50. The motor housing 36 has a substantially concave shape, and is disposed on the radially outer side of the stator 34 to accommodate the stator 34. The motor housing 36 is fixed integrally with the above-described pump housing 16 by a fixture 37.

  And in the fluid pump apparatus 10 provided with said each structure, as FIG. 2 shows, between the radial directions of the cylindrical part 28a of the can 28 and the outer peripheral part 32a of the rotor 32, the 1st axial direction extended in an axial direction A passage 54 is formed, and a radial passage 56 extending in the radial direction is formed between the bottom portion 36 a of the motor housing and the bottom portion 32 b of the rotor 32. Further, a second axial passage 58 extending along the axial direction is formed between the outer peripheral portion 30 a of the rotary shaft 30 and the inner peripheral portion 46 a of the bearing member 46.

  In the present embodiment, the cylindrical portion 28a of the can 28 and the bottom portion 36a of the motor housing 36 constitute a bottomed cylindrical partition wall portion according to the present invention.

  As shown in FIG. 3, the gap 60 between the impeller 26 communicating with the pump chamber 18 and the can 28 has an opening direction set in a direction opposite to the direction in which the fluid is conveyed by the impeller 26. . That is, in the fluid pump device 10, the direction in which the fluid is conveyed by the impeller 26 is the radially outer side (X1 side) of the fluid pump device 10, and the gap between the impeller 26 that communicates with the pump chamber 18 and the can 28. The opening direction of the gap 60 is set on the radially inner side (X2 side) of the fluid pump device 10.

  In the fluid pump device 10, when the impeller 26 rotates together with the rotor 32, the fluid in the pump chamber 18 is transferred to the cylinder of the can 28 as the impeller 26 rotates as indicated by arrows A <b> 1 to A <b> 5 in FIG. 2. A first axial passage 54 between the radial portion 28 a and the outer peripheral portion 32 a of the rotor 32, a radial passage 56 between the bottom portion 36 a of the motor housing and the bottom 32 b of the rotor 32, and the rotary shaft 30. The bearing circulating flow is formed so as to return to the pump chamber 18 through the second axial passage 58 between the outer peripheral portion 30a and the inner peripheral portion 46a of the bearing member 46 in the radial direction.

  Further, in the fluid pump device 10, the axial width W 1 of the radial passage 56 between the motor housing bottom portion 36 a and the rotor 32 bottom portion 32 b in the axial direction is such that the cylindrical portion 28 a of the can 28 and the rotor 32 are The radial width W2 of the first axial passage 54 between the outer peripheral portion 32a and the second axial passage between the outer peripheral portion 30a of the rotary shaft 30 and the inner peripheral portion 46a of the bearing member 46. It is set wider than the radial width W3 of 58 (W1> W2> foreign particle size> W3).

  The axial passage 56 between the motor housing bottom portion 36a and the bottom portion 32b of the rotor 32 between the axial directions functions as a foreign matter reservoir for accumulating inflowing foreign matter, as will be described in detail later. It is set to be larger than the total volume of foreign substances assumed to be generated by using the pump device 10.

  4 and 5, the bottom 32b of the rotor 32 (on the side opposite to the side where the impeller 26 is formed and the side opposite to the axial direction) is radially radiated from the radially inner side to the radially outer side. A plurality of blades 62 (vortex generating means) are provided integrally. As shown in FIG. 2, the plurality of blades 62 are rotatably provided in the radial passage 56 between the motor housing bottom portion 36 a and the rotor 32 bottom portion 32 b in the axial direction, and in the radial passage 56. A vortex 64 can be generated in the fluid that flows into the cylinder as the rotor 32 rotates.

  The control circuit 38 is provided integrally with the motor housing 36 and is electrically connected to the winding 52 provided on the stator 34 described above. And this control circuit 38 is comprised so that an electric current may be sent through the coil | winding 52 provided in the above-mentioned stator 34 sequentially according to the control signal output from the external control apparatus which is not shown in figure.

  Next, the effect of the fluid pump device 10 according to one embodiment of the present invention will be described.

  In the fluid pump device 10 according to the embodiment of the present invention, when the rotor 32 is rotated by the rotating magnetic field applied from the stator 34, the impeller 26 is rotated and fluid is supplied from the outside to the pump chamber 18 through the suction port 20. Inhaled, the fluid in the pump chamber 18 is discharged to the outside through the discharge port 22. As indicated by arrows A1 to A5 in FIG. 2, as the impeller 26 rotates, the fluid in the pump chamber 18 flows between the cylindrical portion 28a of the can 28 and the outer peripheral portion 32a of the rotor 32 in the radial direction. The first axial passage 54, the radial passage 56 between the motor housing bottom 36 a and the rotor 32 bottom 32 b, and the diameters of the outer peripheral portion 30 a of the rotating shaft 30 and the inner peripheral portion 46 a of the bearing member 46. A bearing circulation flow is formed which returns to the pump chamber 18 via a second axial passage 58 between the directions.

  By the way, when the fluid pump device 10 according to an embodiment of the present invention is used in, for example, an automobile engine cooling system, foreign matter such as cast sand is mixed into the engine coolant when the engine is new or the like. It is transported to the pump chamber 18.

  Here, in the fluid pump device 10 according to the embodiment of the present invention, the axial width W1 of the radial passage 56 between the bottom portion 36a of the motor housing and the bottom portion 32b of the rotor 32 in the axial direction is a cylindrical shape of the can 28. The radial width W2 of the first axial passage 54 between the radial direction between the portion 28a and the outer peripheral portion 32a of the rotor 32, and the radial direction between the outer peripheral portion 30a of the rotating shaft 30 and the inner peripheral portion 46a of the bearing member 46. The second axial passage 58 is set wider than the radial width W3, and the radial passage 56 functions as a foreign substance reservoir. For this reason, foreign matter (for example, foreign matter having a small specific gravity or a foreign matter having a small particle size) mixed in the bearing circulation flow described above can be accumulated in the radial passage 56.

  Moreover, a plurality of blades 62 are provided at the bottom 32b of the rotor 32 so as to be rotatably provided in the radial passage 56 described above and cause the fluid flowing into the radial passage 56 to generate a vortex 64 as the rotor 32 rotates. Is provided. Accordingly, when the rotor 32 is rotated, a vortex 64 is formed in the fluid in the radial passage 56 by the plurality of blades 62 described above, so that foreign matter mixed in the fluid in the radial passage 56 is removed from the radial passage. Therefore, it is possible to prevent the foreign matter from being directed to the second axial passage 58 beyond 56 and to collect the foreign matter in the radial passage 56 with certainty. As a result, foreign matter can be prevented from entering between the radial direction between the outer peripheral portion 30a of the rotating shaft 30 and the inner peripheral portion 46a of the bearing member 46 (foreign matter biting).

  As described above, according to the fluid pump device 10 according to the embodiment of the present invention, the foreign matter in the fluid flowing into the pump chamber 18 is caused by the motor portion 14 (particularly, the outer peripheral portion 30a of the rotating shaft 30 and the bearing member 46). Intrusion between the inner peripheral portion 46a and the inner peripheral portion 46a can be reliably prevented with a simple configuration. As a result, the reliability of the fluid pump device 10 can be improved.

  Further, according to the fluid pump device 10 according to one embodiment of the present invention, the plurality of blades 62 described above are provided radially on the bottom 32b of the rotor 32 from the radially inner side to the radially outer side. Therefore, as the rotor 32 rotates, the vortex 64 can be reliably generated in the fluid flowing into the radial passage 56 described above. Thereby, it is possible to reliably prevent foreign matter from entering between the outer peripheral portion 30 a of the rotating shaft 30 and the inner peripheral portion 46 a of the bearing member 46.

  Moreover, according to the fluid pump apparatus 10 which concerns on one Embodiment of this invention, if the impeller 26 rotates, the fluid of the pump chamber 18 will be conveyed to radial direction outer side (X1 side) with rotation of this impeller 26. FIG. Here, the outer diameter φ2 of the impeller 26 is set larger than the inner diameter φ1 of the can 28. Therefore, as shown in FIG. 3, the foreign matter 100 mixed in the fluid in the pump chamber 18 can be conveyed from the radially outer side of the can 28 to the radially outer side (X1 side), and the foreign matter 100 (for example, A large kinetic energy can be imparted to a foreign material having a large specific gravity that is not easily affected by the bearing circulation flow, and the foreign material can be conveyed radially outward (X1 side). Thereby, it is possible to reliably prevent the foreign matter 100 mixed in the fluid in the pump chamber 18 from entering the first axial passage 54 from the pump chamber 18. It is possible to more reliably prevent the outer peripheral portion 30a and the inner peripheral portion 46a of the bearing member 46 from entering the radial direction.

  Furthermore, according to the fluid pump device 10 according to an embodiment of the present invention, the direction in which the fluid is conveyed by the impeller 26 is the radially outer side (X1 side) of the fluid pump device 10 as shown in FIG. The opening direction of the gap 60 between the impeller 26 communicating with the pump chamber 18 and the can 28 is set on the radially inner side (X2 side) of the fluid pump device 10. Thereby, it is possible to reliably prevent the foreign matter 100 mixed in the fluid in the pump chamber 18 from entering the first axial passage 54 from the gap 60 between the impeller 26 communicating with the pump chamber 18 and the can 28.

  That is, for example, as in the configuration according to the comparative example shown in FIG. 6, the opening direction of the gap 60 between the impeller 26 communicating with the pump chamber 18 and the can 28 is the direction in which the fluid is conveyed by the impeller 26 (X1 Direction) and the vertical direction (Y direction), the foreign matter 100 mixed in the fluid in the pump chamber 18 has a gap 60 between the impeller 26 communicating with the pump chamber 18 and the can 28. There is a risk of entering the uniaxial passage 54 (in this comparative example, the same reference numerals as in this embodiment are used for convenience).

  On the other hand, according to the fluid pump device 10 according to the embodiment of the present invention, as shown in FIG. 3, the direction in which the fluid is conveyed by the impeller 26 is the radially outer side (X1 side) of the fluid pump device 10. The opening direction of the gap 60 between the impeller 26 communicating with the pump chamber 18 and the can 28 is set on the radially inner side (X2 side) of the fluid pump device 10. Thereby, it is possible to reliably prevent the foreign matter 100 mixed in the fluid in the pump chamber 18 from entering the first axial passage 54 from the gap 60 between the impeller 26 communicating with the pump chamber 18 and the can 28. The foreign matter 100 can be further reliably prevented from entering between the radial directions of the outer peripheral portion 30a of the rotating shaft 30 and the inner peripheral portion 46a of the bearing member 46 shown in FIG.

  Further, when the fluid pump device 10 is used as a high pressure pump, the flow rate of the bearing circulation flow increases accordingly. According to the fluid pump device 10 according to the embodiment of the present invention, the bottom portion of the rotor 32 is used. Since a large vortex 64 can be formed in the radial passage 56 by the plurality of blades 62 provided in 32 b, this foreign matter can be reliably accumulated in the radial passage 56.

  In addition, according to the fluid pump device 10 according to the embodiment of the present invention, as shown in FIG. 1, the exhaust pressure structure 66 for reducing the pressure in the pump chamber 18 is provided. 66, even if the pressure in the pump chamber 18 is decreased by the pressure of the pump chamber 18 and the above-described bearing circulation flow is changed, the vortex flow is caused in the radial passage 56 by the plurality of blades 62 provided on the bottom 32b of the rotor 32 regardless of the change. By forming 64, this foreign substance can be reliably accumulated in the radial passage 56.

  Next, the modification of the fluid pump apparatus 10 which concerns on one Embodiment of this invention is demonstrated.

  In the above embodiment, the plurality of blades 62 are provided on the bottom 32 b of the rotor 32 as a structure for generating the vortex 64 in the fluid flowing into the radial passage 56, but depending on the structure other than the plurality of blades 62. The vortex 64 may be generated in the fluid flowing into the radial passage 56.

  In the above embodiment, the vortex generating means for generating the vortex 64 in the fluid flowing into the radial passage 56 by the plurality of blades 62 provided on the bottom 32 b of the rotor 32 is configured. The vortex generating means for generating the vortex 64 in the fluid that has flowed into the radial passage 56 may be configured by a plurality of grooves provided radially on the bottom 32b.

It is side surface sectional drawing which shows the whole structure of the fluid pump apparatus which concerns on one Embodiment of this invention. It is a principal part expanded sectional view of the fluid pump apparatus which concerns on one Embodiment of this invention. It is a principal part expanded sectional view of the fluid pump apparatus which concerns on one Embodiment of this invention. It is a side view of an impeller and a rotor provided in a fluid pump device according to an embodiment of the present invention. It is the side view and bottom view of the impeller and rotor which were provided in the fluid pump apparatus which concerns on one Embodiment of this invention. It is a principal part expanded sectional view of the fluid pump apparatus which concerns on the comparative example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fluid pump apparatus, 12 ... Pump part, 14 ... Motor part, 16 ... Pump housing (pump side housing), 18 ... Pump chamber, 20 ... Inlet port, 22 ... Discharge port, 24 ... Blade, 26 ... Impeller, 28 ... Can (part of motor side housing), 28a ... Cylindrical part (cylindrical part of partition wall part), 30 ... Rotating shaft, 30a ... Outer peripheral part, 32 ... Rotor, 32a ... Outer peripheral part, 32b ... Bottom part, 34 ... Stator, 36 ... motor housing (part of motor side housing), 36a ... bottom (bottom of partition), 37 ... fixing device, 38 ... control circuit, 40 ... opening, 42 ... motor chamber, 44 ... support, 46 ... Bearing member, 46a ... Inner circumference, 50 ... Core, 52 ... Winding, 54 ... First axial passage, 56 ... Radial passage, 58 ... Second axial passage, 60 ... Clearance, 62 ... Blade ( Eddy current generating means), 64 ... vortex

Claims (4)

A pump-side housing that forms a pump chamber communicating with the suction port and the discharge port, and a pump unit that includes an impeller that is rotatably disposed in the pump chamber;
A motor-side housing having a bottomed cylindrical partition wall having an opening on the pump chamber side and forming a motor chamber communicating with the pump chamber; a rotating shaft provided in the motor chamber along the axial direction; A rotor supported rotatably on the rotating shaft via a bearing member and disposed in the motor chamber and connected to the impeller so as to rotate together with the impeller, and on the radially outer side of the cylindrical portion of the partition wall A motor unit having a stator provided to face the rotor in the radial direction;
With
Along with the rotation of the impeller, the fluid in the pump chamber causes a first axial passage between the cylindrical portion of the partition wall and the outer periphery of the rotor in the radial direction, the bottom of the partition wall, and the bottom of the rotor. A bearing circulation flow returning to the pump chamber is formed via a radial passage between the axial directions of the first shaft and a second axial passage between the outer peripheral portion of the rotating shaft and the inner peripheral portion of the bearing member. In the fluid pump device,
The axial width of the radial passage is set wider than the radial width of the first axial passage and the radial width of the second axial passage,
At the bottom of the rotor, there is provided vortex generating means that is rotatably provided in the radial passage and that generates a vortex in the fluid flowing into the radial passage along with the rotation of the rotor. Fluid pump device.   2. The fluid pump device according to claim 1, wherein the vortex generating means is configured by a plurality of blades provided radially from a radially inner side to a radially outer side at a bottom portion of the rotor.   The impeller is configured to convey the fluid in the pump chamber to the outside in the radial direction as it rotates, and has an outer diameter set to be larger than an inner diameter of the partition wall. The fluid pump device according to claim 1 or 2.   The clearance gap between the said impeller which communicates with the said pump chamber, and the said partition part is set to the direction opposite to the direction in which the fluid is conveyed by the said impeller, The Claim 1 thru | or Item 4. The fluid pump device according to any one of Items 3 to 3.

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