JP2004068750A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure of and miniaturize a pump device sending fluid especially a pump device suitable for sending fuel to a fuel cell used as a power source for a portable apparatus. <P>SOLUTION: A casing 4 of the pump device 1 consists of a cylindrical vessel shape lower case 2 and a disk shape upper case 3. A periphery part of a bottom surface of the lower case 2 and a periphery part of the upper case 3 are provided with suction openings 10, 7 and discharging openings 11, 8 respectively. An impeller 13 which consists of a disk part 14, an annular wall part 15 is rotatably arranged in the casing 4. An annular permanent magnet 16 is fixed on an inner circumference surface of the annular wall part 15. An annular stator 18 is fixed on an upper surface of the bottom surface of the lower case 2 to be located in the impeller 13. A motor consists of the impeller 13, the permanent magnet 16 and the stator 18. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pump device for feeding fluid, and in particular, a pump suitable for feeding fuel to a fuel cell used as a power source of a portable device such as a notebook personal computer and its peripheral devices, a portable terminal, and a mobile phone. Equipment related.
[0002]
[Problems to be solved by the invention]
The pump device is used in various fields such as a fuel transport means of a fuel tank and a water-cooled cooling device incorporated in a personal computer, and is being miniaturized in many fields.
[0003]
Such a pump device is disclosed in, for example, JP-A-2001-132677. In this pump device, an impeller and a motor are integrated and housed in a housing to reduce the size. However, the pump device has a complicated structure, such as fitting a part of the stator into a casing. In addition, the size of the motor in the axial direction cannot be sufficiently reduced.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pump device that can be downsized with a simple configuration.
[0005]
[Means for Solving the Problems]
The pump device according to claim 1 of the present invention includes a casing having a suction port and a discharge port, an impeller rotatably disposed in the casing, and a motor that rotationally drives the impeller. It is characterized in that the rotor is constituted by an impeller and a permanent magnet provided in the impeller, and a stator is provided so as to overlap with the impeller in the axial direction, having a stator coil arranged to face the permanent magnet. Have.
[0006]
According to the above configuration, the impeller itself functions as a part of the rotor, and the stator and the impeller overlap in the axial direction. Therefore, the axial dimension can be reduced with a relatively simple configuration.
[0007]
The pump device according to claim 2 of the present invention is characterized in that the impeller is provided in the casing with the rotation of the rotating body provided on the disk portion and the annular wall portion provided on the peripheral edge portion of the disk portion. The permanent magnet is formed by an annular magnet provided along an inner peripheral surface of the annular wall portion, and the stator is formed by a stator. It is characterized in that the coil is arranged inside the impeller so as to face the permanent magnet in the radial direction.
[0008]
Further, in the pump device according to claim 3 of the present invention, the impeller is provided with a casing provided with a circular plate portion, an annular wall portion provided on a peripheral edge portion of the circular plate portion, and a rotating member provided on the annular wall portion. The permanent magnet is constituted by an annular magnet provided on an axial end face of the disk portion, and the stator is provided with a stator coil. Are arranged inside the impeller so as to face the permanent magnet in the axial direction.
[0009]
In the configuration of claim 2 or claim 3, since the stator is disposed inside the impeller, the size in the radial direction can be reduced.
[0010]
In the pump device according to a fourth aspect of the present invention, a permanent magnet is provided on both axial end surfaces of the disk portion, and the stator is axially opposed to each of the permanent magnets in the axial direction. It is characterized by being placed on both sides.
[0011]
According to the above configuration, since two motors are configured with the disk portion of the impeller interposed therebetween, torque can be increased.
[0012]
The pump device according to claim 5 of the present invention is configured such that the two motors are driven as a two-phase motor by arranging the two stators so that the phases of the respective stator coils are different. .
[0013]
In the above-described pump device of the present invention, the flow forming means is constituted by a plurality of recesses provided on the outer peripheral surface of the annular wall portion, and the suction port is provided on the inner surface of the casing facing the recess. And a discharge port.
[0014]
Also, the flow forming means may be constituted by a plurality of concave portions provided on at least one of the axial end surfaces of the annular wall portion, and a suction port and a discharge port may be provided on a portion of the inner surface of the casing facing the concave portion. It is a good configuration.
[0015]
According to the above configuration, it is possible to suppress an increase in the thickness dimension and the radial dimension of the impeller.
[0016]
In this case, it is preferable to provide a side channel extending from the suction port to the discharge port in a portion of the inner surface of the casing facing the recess. According to the above configuration, the casing and the impeller can be brought close to each other, and the fluid sucked into the casing from the inlet through the rotation of the impeller can be pressurized by the side channel and discharged from the outlet. With such a configuration, the size of the entire apparatus can be further reduced.
[0017]
The pump device according to claim 6 of the present invention includes a casing having a suction port and a discharge port, an impeller rotatably disposed in the casing, and a motor that rotationally drives the impeller. The rotor is constituted by an impeller and a permanent magnet provided on the impeller, and a stator is arranged on an outer surface of the casing and has a stator coil opposed to the permanent magnet.
[0018]
According to the above configuration, the impeller itself functions as a part of the rotor, and the stator is located outside the casing. Therefore, downsizing can be achieved with a relatively simple configuration.
[0019]
The pump device according to claim 7 of the present invention is configured such that the casing is provided with a cylindrical pump chamber having a suction port and a discharge port at both ends in the axial direction, and the impeller is provided in the pump chamber. A cylindrical member having an outer diameter slightly smaller than an inner diameter of the pump chamber and a plurality of axially extending grooves provided on an outer peripheral surface of the cylindrical member, wherein the permanent magnet is provided. The impeller is provided on the impeller so as to have a plurality of magnetic poles on an outer seed surface thereof, and the stator is provided on an outer peripheral portion of the pump chamber so as to face an outer peripheral surface of the impeller.
[0020]
According to the above configuration, the fluid sucked from the suction port with the rotation of the impeller flows between the inner surface of the pump chamber and the outer peripheral surface of the impeller, and is discharged from the discharge port. With such a configuration, the impeller itself is supported by the inner surface of the pump chamber and rotates. Therefore, the rotating shaft and the bearing can be omitted, and the number of parts can be reduced and the configuration can be simplified.
[0021]
In this case, the stator may be provided on the outer peripheral portion of the pump chamber so as to face a part of the outer peripheral surface of the impeller (the invention of claim 8). According to such a configuration, further miniaturization can be achieved.
[0022]
Further, when the groove is configured to be inclined in the circumferential direction, the fluid in the pump chamber can flow efficiently from the suction port to the discharge port (the invention of claim 9).
[0023]
Further, the pump device according to claim 10 of the present invention is characterized in that the permanent magnet is constituted by an annular magnet disposed on the outer peripheral portion of the columnar member and is magnetized along the groove.
[0024]
According to the above configuration, it is possible to easily magnetize. In particular, when the groove is inclined in the circumferential direction, the permanent magnet is skew-magnetized in an inclined manner, so that the cogging torque torque can be reduced.
[0025]
In the pump device of the present invention, it is preferable that the impeller is made of a permanent magnet material and the permanent magnet material is appropriately magnetized so that a magnetic pole is formed at a predetermined portion. According to the above configuration, the impeller and the permanent magnet can be configured by a single component. In the pump device of the present invention, the impeller may be made of a resin containing fine particles made of a magnetic material.
According to the above configuration, the impeller can function as a rotor yoke, and the impeller and the permanent magnet can be easily formed integrally.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, some embodiments of the present invention will be described with reference to the drawings. First, FIGS. 1 to 3 show a first embodiment of the present invention. As shown in FIGS. 1 and 2, the pump device 1 includes a casing 4 including a cylindrical container-shaped lower case 2 and a disk-shaped upper case 3 that closes an upper opening of the lower case 2.
[0027]
At the center of the upper case 3, a circular convex portion 3a protruding upward is provided. At the center of the bottom of the lower case 2, a convex portion 2a projecting downward and facing the convex portion 3a is provided. Bearings 5a and 5b are fitted into the projections 2a and 3a, respectively, and a rotating shaft 6 is rotatably supported between the bearings 5a and 5b.
[0028]
The upper case 3 is provided with a suction port 7 and a discharge port 8. The suction port 7 and the discharge port 8 are arranged at symmetrical portions of the peripheral portion of the upper case 3 with the convex portion 3a interposed therebetween. Further, on the lower surface of the upper case 3, there is provided a side channel 9 which is an arc-shaped groove extending along the peripheral portion of the upper case 3 from the suction port 7 to the discharge port 8. The side channel 9 is configured to gradually become shallower from the inlet 7 to the outlet 8.
[0029]
On the other hand, a suction port 10, a discharge port 11, and a side channel 12 are provided at the bottom of the lower case 2. The suction port 10, the discharge port 11, and the side channel 12 have substantially the same configuration as the suction port 7, the discharge port 8, and the side channel 9 of the upper case 3, and are disposed at substantially the same locations. Each of the suction ports 7 and 10 and the discharge ports 8 and 11 is formed by fitting a cylindrical member into a through hole provided in the upper case 3 and the lower case 2. With the above configuration, a substantially cylindrical pump chamber 4a is formed in the casing 4.
[0030]
An impeller 13 integrally mounted on the rotating shaft 6 is disposed in the pump chamber 4a. The impeller 13 is made of, for example, a resin containing fine particles made of a magnetic material, and has a disk portion 14 fixed to the rotating shaft 6 and an annular wall extending downward from an outer peripheral edge of the disk portion 14. A section 15 is provided. The outer diameter and the axial dimension of the impeller 13 are set slightly smaller than the inner diameter and the axial dimension of the pump chamber 4a.
[0031]
An annular permanent magnet 16 is fixed to the inner peripheral surface of the annular wall portion 15. The permanent magnet 16 or a so-called plastic magnet is formed integrally with the impeller 13. With the above configuration, a rotor 17 is configured by the impeller 13 and the permanent magnet 16. Since the impeller 13 is made of a resin containing fine particles made of a magnetic material, the annular wall portion 15 functions as a rotor yoke (rotor core).
[0032]
On the other hand, an annular stator 18 is fixed to the periphery of the bearing 5 b on the upper surface of the bottom of the lower case 2 so as to be located inside the impeller 13. The stator 18 is configured by molding a stator core 20 around which a stator coil 19 is wound with an insulating resin 21. As described above, the motor 22 includes the impeller 13, the permanent magnet 16, and the stator 18.
[0033]
At this time, the upper surface of the stator 17 is configured to be substantially flat, and is configured to face the lower surface of the disk portion 14 of the impeller 13 with a slight gap. Further, the outer peripheral surface of the stator 18 is configured to be a circumferential surface centered on the axis center of the rotating shaft 6, and is configured to face the inner peripheral surface of the permanent magnet 16 via a slight gap. ing. With the above configuration, the fluid in the pump chamber 4a is prevented from flowing between the impeller 13 and the stator 18.
[0034]
As shown in FIGS. 1 and 3, on the upper and lower surfaces of the annular wall portion 15 of the impeller 13, a large number of rectangular recesses 23 and 24 are provided at substantially equal intervals over the entire circumference. ing. The recesses 23 and 24 are configured to face the suction ports 7 and 10 and the discharge ports 8 and 11 and the side channels 9 and 12. The recesses 23 and 24 function as flow forming means. When the impeller 13 rotates, the fluid in the casing 4 flows from the suction port 7 toward the discharge port 8.
[0035]
In the pump device 1 having the above-described configuration, when the stator coil 19 is energized to generate a rotating magnetic field and the rotor 17, that is, the impeller 13 is driven to rotate, fluid is sucked into the casing 4 from the suction ports 7 and 10, The liquid is discharged from the discharge ports 8 and 11 through the channels 9 and 12. At this time, by the cooperation of the concave portions 23 and 24 of the impeller 13 and the side channels 9 and 12, the fluid passing through the side channels 9 and 12 is pressurized and directed toward the discharge ports 8 and 11.
[0036]
As described above, in the present embodiment, the rotor 17 is constituted by the impeller 13 and the permanent magnet 16, and the stator 18 is disposed inside the impeller 13. In addition, concave portions 23 and 24 are provided on the upper and lower surfaces of the annular wall portion 15 of the impeller 13 to constitute the flow forming means. Further, the fluid sucked into the casing 4 from the suction ports 7 and 10 is configured to flow toward the discharge ports 8 and 11 through the side channels 9 and 12 so that the impeller 13 and the casing 4 are brought close to each other. With the above configuration, the pump device 1 can be made thinner and smaller.
[0037]
In addition, by adjusting the positions where the recesses 23 and 24 are formed in the impeller 13 and the sizes of the recesses 23 and 24, the imbalance of the impeller 13 can be easily corrected.
[0038]
Further, in the present embodiment, since the suction ports 7, 10 and the discharge ports 8, 11 are provided on the upper and lower surfaces of the casing, the pump amount of the pump device 1 can be increased.
[0039]
FIGS. 4 and 5 show a second embodiment of the present invention, and the differences from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. In the second embodiment, a large number of concave portions 31 are provided on the outer peripheral surface of the annular wall portion 15 of the impeller 13 at substantially equal intervals over the entire circumference.
[0040]
On the other hand, a suction port 32 and a discharge port 33 are provided in a portion of the peripheral wall of the casing 4 (the lower case 2) facing the recess 31. The suction port 32 and the discharge port 33 are provided at symmetrical portions, and a side channel 34 including an arc-shaped groove extending from the suction port 32 toward the discharge port 33 is provided on the inner surface of the peripheral wall. . The side channel 34 is configured to gradually become shallower from the suction port 32 side toward the discharge port 33 side. In FIG. 5, the cylindrical member of the suction port 32 is omitted.
[0041]
In the second embodiment having such a configuration, substantially the same operation and effect as those of the first embodiment can be obtained.
[0042]
FIG. 6 shows a third embodiment of the present invention, and the differences from the first embodiment will be described. The same parts as those in the first embodiment are denoted by the same reference numerals. In the third embodiment, a flat annular permanent magnet 41 is embedded in the lower surface of the disk portion 14 of the impeller 13. The permanent magnet 41 is formed of a so-called plastic magnet similarly to the permanent magnet 16.
[0043]
On the other hand, an iron plate (not shown) serving as a stator yoke and a plurality of air-core coils (not shown) mounted thereon are provided around the bearing 5b on the upper surface of the bottom of the lower case 2 with resin. An annular stator 42 is provided which is formed integrally with the stator.
[0044]
In this embodiment, the rotor 43 is constituted by the permanent magnet 41 and the impeller 13, and the motor 44 is constituted by the rotor 43 and the stator 42. In the motor 44, the permanent magnet 41 and the stator coil face each other in the axial direction.
In the third embodiment having such a configuration, substantially the same operation and effect as those of the first embodiment can be obtained.
[0045]
FIG. 7 shows a fourth embodiment of the present invention, and the differences from the third embodiment will be described. The same parts as those in the third embodiment are denoted by the same reference numerals. That is, in the fourth embodiment, the annular wall portion 15 of the impeller 13 extends in the vertical direction from the peripheral edge of the disk portion 14, and concave portions 23 and 24 are provided on the upper and lower surfaces thereof, respectively. A flat annular permanent magnet 41 is embedded in the upper and lower surfaces of the disk portion 14, respectively.
[0046]
On the other hand, annular stators 42 are arranged on the lower surface of the lower case 2 on the periphery of the bearing 5b and on the lower surface of the upper case 3 on the periphery of the bearing 5a. Each of the upper and lower stators 42 has an air-core coil that faces the permanent magnet 41 in the axial direction.
[0047]
In the present embodiment, two permanent magnets 41 are provided on the upper and lower surfaces of the disk portion 14 of the impeller 13 and the stator 42 is provided in a portion of the casing 4 that faces each of the permanent magnets 41. It is driven by two motors 44. Therefore, the driving torque of the impeller 13 increases.
[0048]
FIG. 8 shows a fifth embodiment of the present invention, and the differences from the third embodiment will be described. The same parts as those in the third embodiment are denoted by the same reference numerals. In the fifth embodiment, the stator 42 is disposed on the outer surface of the casing 4. Specifically, a concave portion 51 is provided in the lower surface of the bottom of the lower case 2 around the convex portion 2a, and the stator 42 is fitted into the concave portion 51. Although not shown, a groove similar to the side channel 12 of the pump device 1 shown in FIG. 6 is formed on the upper surface of the bottom of the lower case 2.
[0049]
On the other hand, a convex portion 52 extending downward along the rotation shaft 6 is provided on the inner peripheral portion of the lower surface of the disk portion 14 of the impeller 13. The lower surface of the convex portion 52 and the lower surface of the annular wall portion 15 are located on the same horizontal plane. An annular permanent magnet 41 is embedded between the convex portion 52 and the annular wall portion 15 on the lower surface of the disk portion 14. At this time, the lower surface of the permanent magnet 41 is flush with the lower surfaces of the convex portion 52 and the annular wall portion 15 and is configured to be close to the upper surface of the bottom of the lower case 2. Therefore, the same fluid flow path is formed on the upper surface and the lower surface of the impeller 13 in the casing 4.
[0050]
According to the above configuration, since the stator 42 is disposed on the outer surface of the casing 4, the size of the pump device 1 can be reduced accordingly. In particular, in the present embodiment, since the stator 42 is arranged around the protrusion 2a that accommodates the bearing 5a in the lower case 2, the thickness of the stator 42 is offset by the protrusion size of the protrusion 2a. For this reason, the size of the pump device 1 in the axial direction can be further reduced.
[0051]
FIG. 9 shows a sixth embodiment of the present invention. In the pump device 60 according to the sixth embodiment, the casing 61 includes a cylindrical pump chamber 62, and a cylindrical suction port 63 and a discharge port provided at both ends in the axial direction and having a smaller diameter than the pump chamber 62. An outlet 64 is provided.
[0052]
In the pump chamber 62, a columnar impeller 66 having a large number of grooves 65 on its outer peripheral surface is housed. The impeller 66 has an outer diameter and an axial dimension slightly smaller than the inner diameter and the axial dimension of the pump chamber 62.
[0053]
The groove 65 is configured to be inclined in the circumferential direction. The impeller 66 is made of a permanent magnet material, and is magnetized so that a plurality of magnetic poles along the groove 65 are formed on the outer circumference thereof over the entire circumference. By configuring the impeller 66 from a permanent magnet material in this way, the impeller 66 and the permanent magnet can be configured by a single component.
[0054]
On the other hand, an annular stator 67 having a stator coil (not shown) facing the outer peripheral surface of the impeller 66 is provided on the outer peripheral surface of the pump chamber 62.
[0055]
In the pump device 60, when the stator coil is energized, the impeller 66 rotates in the pump chamber 62, and with the rotation of the impeller 66, the fluid in the pump chamber 62 flows from the suction port 63 to the discharge port 64 by the groove 65. Flowing towards.
[0056]
As described above, in the present embodiment, the impeller 66 rotates without contact with the inner surface of the pump chamber 62 due to the fluid flowing between the inner surface of the pump chamber 62 and the outer peripheral surface of the impeller 66. That is, since the impeller 66 and the pump chamber 62 are configured to function as a rotating shaft and a bearing, it is possible to reduce the number of components constituting the pump device 60 and simplify the configuration.
[0057]
Further, in this embodiment, since the stator 67 is provided so as to overlap the impeller 66 in the axial direction and outside the casing 61, the size can be further reduced.
[0058]
Further, since the groove 65 is provided to be inclined in the circumferential direction, the fluid in the pump chamber 62 can flow efficiently from the suction port 63 to the discharge port 64.
[0059]
Further, since the impeller 66 is made of a permanent magnet material and is magnetized so that a plurality of magnetic poles along the groove 65 are formed on the outer peripheral surface thereof over the entire circumference, cogging torque can be reduced.
[0060]
In the sixth embodiment, the entire outer peripheral surface of the pump chamber 62 is covered by the annular stator 67. However, as shown in the seventh embodiment shown in FIG. It may be formed in a rectangular plate shape facing a part of the outer peripheral surface of the impeller 66, and may be arranged on a part of the outer peripheral surface of the pump chamber 62.
[0061]
Even in such a configuration, substantially the same operation and effect as in the sixth embodiment can be obtained, and further downsizing can be achieved.
[0062]
Further, the present invention is not limited to the above-described embodiment, and for example, the following modifications are possible.
The flow forming means may be configured by providing a convex portion on the impeller.
[0063]
In the fourth embodiment shown in FIG. 7, the air-core coils of the stator 42 provided on the upper and lower sides in the casing 4 may be arranged so as to have different phases. With such a configuration, the impeller 13, the two permanent magnets 41, and the two stators 42 can be driven as a two-phase motor.
[0064]
Also in the pump device shown in the first to fifth embodiments, the impeller is made of a permanent magnet material, and the impeller is formed on a predetermined portion of the impeller, that is, on the inner peripheral surface of the annular wall or the axial end surface of the disk portion in the circumferential direction. It may be configured so as to be appropriately magnetized so as to form a magnetic pole along the magnetic pole. Also in this case, the impeller and the permanent magnet can be constituted by a single component.
[0065]
The permanent magnet is not limited to one integrally formed in an annular shape, and a plurality of divided segment-shaped permanent magnets may be arranged along the inner peripheral surface of the annular wall portion.
[0066]
【The invention's effect】
As apparent from the above description, the pump device according to the first aspect of the present invention has a relatively simple structure because the impeller itself functions as a part of the rotor and the stator and the impeller overlap in the axial direction. Thus, the size in the axial direction can be reduced.
[0067]
In the pump device according to claim 6 of the present invention, the impeller itself functions as a part of the rotor, and the stator is located outside the casing, so that the size can be reduced with a relatively simple configuration.
[0068]
The pump device according to claim 7 of the present invention provides a cylindrical pump chamber in the casing, and a cylindrical member having an outer diameter slightly smaller than the inner diameter of the pump chamber and an outer peripheral surface of the cylindrical member. An impeller having a plurality of grooves extending in the axial direction is disposed in the pump chamber, and the stator is provided on an outer peripheral portion of the pump chamber so as to face an outer peripheral surface of the impeller. Can function as a rotating shaft and a bearing, and the number of parts can be reduced and the configuration can be simplified.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional front view of a pump device showing a first embodiment of the present invention. FIG. 2 is a view of an upper case viewed from below. FIG. 3 is a top view of an impeller. FIG. FIG. 5 is a perspective view of a lower case, FIG. 6 is a perspective view of a lower case, FIG. 6 is a perspective view of a third embodiment of the present invention. FIG. 7 is a view of a fourth embodiment of the present invention. FIG. 8 shows a fifth embodiment of the present invention. FIG. 9 shows a sixth embodiment of the present invention. (A) is a vertical sectional side view of a pump device, (B) is a longitudinal sectional front view taken along line X1-X1 in (a) of FIG. 9; FIG. 10 shows a seventh embodiment of the present invention, (a) is a diagram corresponding to FIG. 9 (a), (B) is a longitudinal sectional front view along the line X2-X2 in FIG.
1, 60 is a pump device, 4, 61 is a casing, 7, 10, 32, 63 are suction ports, 8, 11, 33, 64 are discharge ports, 9, 12, 34 are side channels, 13, 66 are impellers, 14 is a disk part, 15 is an annular wall part, 16 and 41 are permanent magnets, 17 and 43 are rotors, 18, 42, 67 and 71 are stators, 19 is a stator coil, 22 and 44 are motors, 23, 24, and 24. 31 is a concave portion (flow forming means), 62 is a pump chamber, and 65 is a groove.

Claims (10)

A casing having a suction port and a discharge port, an impeller rotatably disposed in the casing, and a pump device including a motor that rotationally drives the impeller.
The motor includes a rotor configured from the impeller and a permanent magnet provided on the impeller, and a stator provided with a stator coil opposed to the permanent magnet and provided to overlap with the impeller in the axial direction. A pump device comprising: The impeller has a disk portion, an annular wall portion provided on a peripheral portion of the disk portion, and a fluid in the casing which is provided on the annular wall portion and moves the fluid in the casing from the suction port to the discharge port with the rotation of the rotating body. And a flow forming means for flowing.
The permanent magnet is constituted by an annular magnet provided along the inner peripheral surface of the annular wall portion, and the stator is disposed inside the impeller such that a stator coil is radially opposed to the permanent magnet. The pump device according to claim 1, wherein: The impeller has a disk portion, an annular wall portion provided on a peripheral portion of the disk portion, and a fluid in the casing which is provided on the annular wall portion and moves the fluid in the casing from the suction port to the discharge port with the rotation of the rotating body. And a flow forming means for flowing.
The permanent magnet is constituted by an annular magnet provided on an axial end surface of the disk portion, and the stator is disposed inside the impeller such that a stator coil is axially opposed to the permanent magnet. The pump device according to claim 1, wherein: Permanent magnets are provided on both axial end surfaces of the disk part,
4. The pump device according to claim 3, wherein the stator is disposed on both axial sides of the disk portion so as to face each of the permanent magnets in the axial direction. 5. The pump device according to claim 4, wherein the two stators are arranged so that the phases of the respective stator coils are different. A casing having a suction port and a discharge port, an impeller rotatably disposed in the casing, and a pump device including a motor that rotationally drives the impeller.
The motor includes: a rotor including the impeller and a permanent magnet provided on the impeller; and a stator having a stator coil disposed on an outer surface of the casing and facing the permanent magnet. And pump equipment. The casing includes a cylindrical pump chamber having a suction port and a discharge port at both ends in the axial direction,
The impeller includes a columnar member disposed in the pump chamber and having an outer diameter slightly smaller than the inner diameter of the pump chamber, and a plurality of axially extending grooves provided on an outer peripheral surface of the columnar member. Composed of
A permanent magnet is provided on the impeller so as to have a plurality of magnetic poles on an outer peripheral surface of the impeller,
7. The pump device according to claim 1, wherein the stator is provided on an outer peripheral portion of the pump chamber so as to face an outer peripheral surface of the impeller. The pump device according to claim 7, wherein the stator is provided on an outer peripheral portion of the pump chamber so as to face a part of an outer peripheral surface of the impeller. 9. The pump device according to claim 7, wherein the groove is configured to be inclined in the circumferential direction. The pump device according to any one of claims 7 to 9, wherein the permanent magnet is formed of an annular magnet disposed on an outer peripheral portion of the columnar member, and is magnetized along the groove.

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