Pump device

Abstract

A pump device contributes to improving the degree of freedom of assembly of a cover and shortening the time for filling a cylindrical part with a potting material. A pump device according to the present invention is provided with a housing, a stator, and a circuit board. The housing includes: a cylinder portion extending in an axial direction; and a cover provided at an end portion on one side in the axial direction of the cylinder portion, the stator being housed in the cylinder portion and including: a stator core having a plurality of pole teeth arranged at intervals in the circumferential direction; and a coil having a plurality of coil bodies wound around each pole tooth via an insulator, the circuit board is housed in the tube portion and positioned between the stator and the cover in the axial direction, the tube portion is filled with a potting material covering the coil and the circuit board, and at least one of the circuit board and the housing is provided with a passage portion in at least one position in the circumferential direction. The cover is provided with a hole portion penetrating in the axial direction, the gap between the coil bodies adjacent in the circumferential direction overlaps the hole portion in the axial direction, and the passage portion allows the pouring material injected into the cylinder portion from the hole portion to flow through and covers the coil.

Description

Technical Field

[0001] The present invention relates to a pump device. Background Art

[0002] In the past, there was a pump device having a housing, a stator and a circuit substrate, the housing including: a barrel extending in the axial direction; and a cover arranged at an end portion of one side of the barrel in the axial direction, the stator being housed in the barrel and including: a stator core having a plurality of pole teeth arranged at intervals in the circumferential direction; and a coil having a plurality of coil bodies wound around each of the pole teeth via an insulator, the circuit substrate being housed in the barrel and being located axially between the stator and the cover, the barrel being filled with a potting material covering the coil and the circuit substrate.

[0003] However, in the above-mentioned pump device, the cover is assembled to the barrel after the potting material solidifies. When the cover is assembled to the barrel, the potting material cannot be filled. Therefore, the assembly freedom of the cover is limited. In addition, since the potting material usually has a certain viscosity, it is easy to take time when filling it into the barrel. Summary of the invention

[0004] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a pump device that helps to improve the assembly freedom of the cover and shorten the filling time of the potting material into the cylinder.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a pump device, comprising a housing, a stator and a circuit substrate, the housing comprising: a barrel extending in the axial direction; and a cover arranged at an end portion of one side of the barrel in the axial direction, the stator is accommodated in the barrel and comprises: a stator core having a plurality of pole teeth arranged at intervals in the circumferential direction; and a coil having a plurality of coil bodies wound around each of the pole teeth via an insulator, the circuit substrate is accommodated in the barrel and is located between the stator and the cover in the axial direction, the barrel is filled with a potting material covering the coil and the circuit substrate, wherein at least one of the circuit substrate and the housing is provided with a passage portion at least at one point in the circumferential direction, the cover is provided with a hole portion penetrating in the axial direction, and a gap between the circumferentially adjacent coil bodies overlaps with the hole portion in the axial direction, and the passage portion allows the potting material injected from the hole portion into the barrel to flow through and cover the coil.

[0006] According to the pump device of the present invention, at least one of the circuit substrate and the housing is provided with a passage portion at least at one point in the circumferential direction, the cover is provided with a hole portion extending through the cover in the axial direction, and the gap between the circumferentially adjacent coil bodies overlaps with the hole portion in the axial direction. The passage portion allows the potting material injected into the barrel portion from the hole portion to flow through and cover the coil. Therefore, even when the cover is assembled to the barrel portion, the potting material can be filled into the barrel portion through the hole portion provided in the cover, thereby improving the assembly freedom of the cover, and by filling the potting material into the hole portion overlapping with the gap between the circumferentially adjacent coil bodies in the axial direction, the potting material can be quickly filled into the barrel portion, thereby shortening the filling time.

[0007] Furthermore, in the pump device of the present invention, it is preferable that each of the gaps between the coil bodies adjacent to each other in the circumferential direction overlaps with the hole portion in the axial direction.

[0008] According to the pump device of the present invention, each gap between the circumferentially adjacent coil bodies overlaps with the hole portion in the axial direction, so that the potting material can be easily filled into the cylinder portion at multiple locations in the circumferential direction, further shortening the filling time.

[0009] In the pump device of the present invention, it is preferable that a plurality of the hole portions are provided at intervals in the circumferential direction, and each of the gaps between the coil bodies adjacent to each other in the circumferential direction overlaps with the passage portion and the hole portion in the axial direction.

[0010] According to the pump device of the present invention, a plurality of hole portions are arranged at intervals in the circumferential direction, and each gap between the circumferentially adjacent coil bodies overlaps with the passage portion and the hole portion in the axial direction, respectively. Therefore, the potting material can be more conveniently filled into the cylinder portion at multiple locations in the circumferential direction, further shortening the filling time.

[0011] In addition, in the pump device of the present invention, the passage portion preferably includes at least one of a first avoidance portion and a second avoidance portion, wherein the first avoidance portion is a recessed portion provided on the outer peripheral edge of the circuit substrate, and the second avoidance portion is a through hole penetrating the circuit substrate along the axial direction.

[0012] According to the pump device of the present invention, the passage portion includes at least one of a first avoidance portion and a second avoidance portion, the first avoidance portion is a recessed portion arranged on the outer peripheral edge of the circuit substrate, and the second avoidance portion is a through hole penetrating the circuit substrate along the axial direction. Therefore, the passage portion can be simply formed, which helps to reduce manufacturing costs.

[0013] Furthermore, in the pump device of the present invention, it is preferable that the coil body is electrically connected to the circuit board via a connection portion, and the connection portion passes through the first escape portion.

[0014] According to the pump device of the present invention, the coil body is electrically connected to the circuit substrate via the connecting portion, and the connecting portion passes through the first escape portion. Therefore, the connecting portion can be easily inserted into the first escape portion through the opening on the outer peripheral side, further improving assembly efficiency.

[0015] Furthermore, in the pump device of the present invention, it is preferable that the connecting portion abuts against a bottom surface and both side surfaces of the first escape portion.

[0016] According to the pump device of the present invention, the connection portion abuts against the bottom surface and both side surfaces of the first avoidance portion, thereby helping to prevent the connection portion from moving during the filling process of the potting material and affecting the stability of the connection.

[0017] In addition, in the pump device of the present invention, it is preferred that an electrical component is provided on the circuit substrate, the electrical component protrudes toward one side in the axial direction and is exposed from the potting material, the cover has a plate-like portion and a storage portion, the plate-like portion extends in a direction perpendicular to the axial direction and is provided with the hole portion, the storage portion protrudes toward one side in the axial direction than the plate-like portion, and covers and stores the electrical component from one side in the axial direction.

[0018] According to the pump device of the present invention, electrical components are arranged on the circuit substrate, the electrical components protrude to one side in the axial direction and are exposed from the potting material, the cover has a plate-like portion and a storage portion, the plate-like portion extends in a direction perpendicular to the axial direction and is provided with a hole portion, the storage portion protrudes to one side in the axial direction more than the plate-like portion, and covers and stores the electrical components from one side in the axial direction. Therefore, compared with the case where the potting material is used to cover the higher electrical components other than the shorter parts such as the soldering part, the amount of potting material can be saved.

[0019] Furthermore, in the pump device of the present invention, preferably, a part of the hole is shielded by the circuit board when viewed in the axial direction.

[0020] According to the pump device of the present invention, a part of the hole is shielded by the circuit board when viewed in the axial direction, thereby helping to suppress dust and the like from entering the other side of the cylinder in the axial direction than the circuit board through the hole.

[0021] Furthermore, in the pump device of the present invention, preferably, the circuit board is provided with a lead wire, the lead wire extends from the circuit board toward one side in the axial direction, passes through the hole, is bent toward the radially outer side, and penetrates the housing.

[0022] Furthermore, the pump device of the present invention preferably further includes a rotor and an impeller, wherein the rotor is surrounded by the stator from the radially outer side, and the impeller is accommodated in the cylindrical portion and provided on the other side of the rotor in the axial direction.

[0023] (Effects of the Invention)

[0024] According to the present invention, at least one of the circuit substrate and the housing is provided with a passage portion at least at one point in the circumferential direction, the cover is provided with a hole portion penetrating in the axial direction, and the gap between the circumferentially adjacent coil bodies overlaps with the hole portion in the axial direction, and the passage portion allows the potting material injected into the cylinder portion from the hole portion to flow through and cover the coil. Therefore, even when the cover is assembled to the cylinder portion, the potting material can be filled into the cylinder portion through the hole portion provided in the cover, thereby improving the assembly freedom of the cover, and by filling the potting material into the hole portion that overlaps with the gap between the circumferentially adjacent coil bodies in the axial direction, the potting material can be quickly filled into the cylinder portion, thereby shortening the filling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a perspective view schematically showing a pump device according to an embodiment of the present invention.

[0026] Figure 2 It is a top view schematically showing a pump device according to an embodiment of the present invention.

[0027] Figure 3 It indicates that Figure 2 Sectional view along line AA.

[0028] Figure 4 It indicates that Figure 2 Cross-sectional view of line BB in .

[0029] Figure 5 It is a partially cutaway perspective view schematically showing a pump device according to an embodiment of the present invention.

[0030] Figure 6 It is a plan view schematically showing a state where a cover of the pump device according to the embodiment of the present invention is removed.

[0031] (Explanation of symbols)

[0032] 1 Pump unit

[0033] 10 Housing

[0034] 20 Stator

[0035] 21 stator core

[0036] 22 Insulator

[0037] 23 Coil

[0038] 231 Coil body

[0039] 232 Connection

[0040] 30 Circuit board

[0041] 31 Positioning hole

[0042] 32 Electrical components

[0043] 40 Watering materials

[0044] 50 Rotor

[0045] 51 Main body

[0046] 52 Magnet

[0047] 60 Impeller

[0048] 61 First board

[0049] 62 Second board

[0050] 63 blades

[0051] 70 Shaft

[0052] 80 Radial bearings

[0053] 90 Lead wire

[0054] BP barrel

[0055] BP1 First barrel

[0056] BP2 Second barrel

[0057] CV Cover

[0058] CV1 plate-shaped part

[0059] CV2 Storage

[0060] HP hole

[0061] RP Channel Department

[0062] RP1 First avoidance section

[0063] RP11 first recess

[0064] RP12 second recess

[0065] RP13 third recess

[0066] GP Clearance

[0067] CP End Caps

[0068] LP limiter

[0069] DP partition wall

[0070] DP1 Ring

[0071] DP2 cylindrical part

[0072] DP3 plate part

[0073] BA Bearing Division

[0074] PP protrusion

[0075] IL Suction pipe

[0076] OL discharge pipe DETAILED DESCRIPTION

[0077] Next, combine Figures 1 to 6 The embodiments of the present invention are described, wherein: Figure 1 is a perspective view schematically showing a pump device according to an embodiment of the present invention, Figure 2 is a top view schematically showing a pump device according to an embodiment of the present invention, Figure 3 It indicates that Figure 2 The cross-sectional view of line AA in the figure, Figure 4 It indicates that Figure 2 The cross-sectional view of line BB in Figure 5 is a partially cutaway perspective view schematically showing a pump device according to an embodiment of the present invention, Figure 6 It is a plan view schematically showing a state where a cover of the pump device according to the embodiment of the present invention is removed.

[0078] Here, for convenience of explanation, the extending direction of the rotation center line L of the rotor is referred to as the axial direction, the circumferential direction centered on the rotation center line L is referred to as the circumferential direction, and the radial direction centered on the rotation center line L is referred to as the radial direction.

[0079] (Overall structure of the pump device)

[0080] like Figures 1 to 4 As shown, the pump device 1 has a housing 10, a stator 20 and a circuit substrate 30, the housing 10 includes: a barrel BP extending in the axial direction; and a cover CV provided at an end of one side L1 of the barrel BP in the axial direction, the stator 20 is accommodated in the barrel BP, and includes: a stator core 21 having a plurality of pole teeth arranged at intervals in the circumferential direction; and a coil 23 having a plurality of coil bodies 231 wound around each pole tooth via an insulator 22, the circuit substrate 30 is accommodated in the barrel BP, and is located between the stator 20 and the cover CV in the axial direction, the barrel BP is filled with a potting material 40 covering the coil 23 and the circuit substrate 30; and, at least one of the circuit substrate 30 and the housing 10 is provided with a passage RP at least at one point in the circumferential direction, the cover CV is provided with a hole HP penetrating in the axial direction, and the gap GP between the circumferentially adjacent coil bodies 231 overlaps with the hole HP in the axial direction, and the passage RP allows the potting material 40 injected from the hole HP into the barrel BP to flow through and cover the coil 23.

[0081] Here, if Figure 1 and Figure 2As shown, a plurality of hole portions HP are arranged at intervals in the circumferential direction, and include a first hole portion that is roughly rectangular and a second hole portion that is larger than the first hole portion and roughly semicircular. Each gap GP between circumferentially adjacent coil bodies 231 overlaps the passage portion RP and the hole portion HP in the axial direction, respectively.

[0082] In addition, if Figure 3 As shown, the pump device 1 further includes a rotor 50 and an impeller 60 . The rotor 50 is surrounded by the stator 20 from the radially outer side. The impeller 60 is accommodated in the cylinder portion BP and is provided on the other side L2 of the rotor 50 in the axial direction.

[0083] In addition, when the pump device 1 is working, the impeller 60 is driven to rotate by the rotation of the rotor 50, and the working fluid such as water is sucked into the pump chamber formed in the housing 10 from the suction pipe IL provided in the housing 10, and is discharged from the discharge pipe OL provided in the housing 10 after being pressurized.

[0084] (Structure of the housing)

[0085] As described above, the housing 10 includes the barrel portion BP and the cover CV.

[0086] Here, the housing 10 is made of resin, for example. Figure 3 As shown, the housing 10 also has an end cover CP and a partition wall DP. Specifically, the barrel BP includes a first barrel BP1 and a second barrel BP2 extending axially with the rotation center line L as the center, and a discharge pipe OL is provided in the first barrel BP1, and the discharge pipe OL extends from the first barrel BP1 in a direction perpendicular to the axial direction, and the second barrel BP2 is provided at the end of one side L1 of the first barrel BP1 in the axial direction. In addition, the end cover CP closes the opening of the other side L2 of the first barrel BP1 in the axial direction, and is formed as a whole with the first barrel BP1, and is provided with a suction pipe IL, which extends from the end cover CP to the other side L2 in the axial direction and then bends in a direction perpendicular to the axial direction. Furthermore, the partition wall DP is formed integrally with the second barrel BP2 and includes an annular portion DP1, a cylindrical portion DP2 and a plate-like portion DP3, wherein the annular portion DP1 extends radially inward from the end of the other side L2 of the second barrel BP2 in the axial direction with the rotation center line L as the center, the cylindrical portion DP2 extends from the radial inner edge of the annular portion DP1 toward the one side L1 in the axial direction, and the plate-like portion DP3 closes the opening of the one side L1 in the axial direction of the cylindrical portion DP2. Thus, the first barrel BP1, the end cover CP and the partition wall DP constitute a pump chamber for accommodating the rotor 50 and the impeller 60.

[0087] In addition, if Figure 3 As shown, the housing 10 further comprises a limiting portion LP, which extends from the center of the end cover CP toward one side L1 in the axial direction.

[0088] In addition, if Figure 2, Figure 4 and Figure 5 As shown, the cover CV has a plate-like portion CV1 and a receiving portion CV2. The plate-like portion CV1 expands in a direction perpendicular to the axial direction and is provided with a hole HP. The receiving portion CV2 protrudes toward one side L1 in the axial direction than the plate-like portion CV1. Figure 3 As shown, the plate-like portion CV1 is fixed to a protrusion PP protruding from the center of the plate-like portion DP3 toward one side L1 in the axial direction via a screw.

[0089] In addition, if Figure 6 As shown, the passage RP is formed on the entire outer periphery of the circuit substrate 30 and includes a first avoidance portion RP1, which is a recessed portion provided on the outer periphery of the circuit substrate 30, and the recessed portion and the inner surface of the barrel BP form the passage RP. Specifically, as Figure 6 As shown, the first avoidance portion RP1 includes a first recess RP11, a second recess RP12 having a larger circumferential dimension than the first recess RP11, and a third recess RP13 having substantially the same axial dimension as the second recess RP12 but a larger radial dimension than the second recess RP12.

[0090] (Structure of stator)

[0091] As described above, the stator 20 includes the stator core 21 having a plurality of pole teeth arranged at intervals in the circumferential direction, and the coil 23 having a plurality of coil bodies 231 wound around the respective pole teeth via the insulator 22 .

[0092] Here, if Figure 2 As shown, the coil body 231 is electrically connected to the circuit board 30 via the connection portion 232, and the connection portion 232 passes through the first escape portion RP1. Specifically, the connection portion 232 passes through the first recess RP11, and the connection portion 232 abuts against the bottom surface and both side surfaces of the first recess RP11.

[0093] (Structure of rotor and impeller)

[0094] like Figure 3 As shown, the rotor 50 is supported by the housing 10 via a shaft portion 70 .

[0095] Here, if Figure 3As shown, the rotor 50 includes a main body 51 and a magnet 52. The main body 51 is cylindrical and extends in the axial direction with the rotation center line L as the center. The magnet 52 is arranged on the outer peripheral side of the main body 51. In addition, a radial bearing 80 is fixed inside the main body 51. The radial bearing 80 is rotatably sleeved on the shaft 70, and the rotor 50 is supported on the shaft 70 via the radial bearing 80. The end of the shaft 70 on one side L1 in the axial direction is fixed by the bearing portion BA provided on the plate-shaped portion DP3 of the partition wall DP, and the end of the shaft 70 on the other side L2 in the axial direction is opposite to the stopper LP on the one side L1 in the axial direction.

[0096] In addition, if Figure 3 As shown, the impeller 60 includes a first plate portion 61, a second plate portion 62 and blades 63. The first plate portion 61 is annular with the rotation center line L as the center, and the closer to the radial outside, the closer to the axial side L1. The second plate portion 62 is also annular with the rotation center line L as the center, and is spaced apart from the first plate portion 61 on the axial side L1, and extends radially outward from the end of the other axial side L2 of the main body portion 51. A plurality of blades 63 are arranged at intervals in the circumferential direction, extending from the first plate portion 61 to the second plate portion 62, and extending from the inner peripheral edges of the first plate portion 61 and the second plate portion 62 to the vicinity of the outer peripheral edges of the first plate portion 61 and the second plate portion 62.

[0097] (Structure of circuit board)

[0098] like Figures 2 to 5 As shown, the circuit substrate 30 extends in a direction perpendicular to the axial direction, and a part of the hole HP is shielded by the circuit substrate 30 when viewed in the axial direction.

[0099] In addition, if Figure 3 As shown, a positioning hole 31 is provided at the center of the circuit substrate 30 , and the positioning hole 31 penetrates in the axial direction, and a protrusion PP protruding from the center of the plate-shaped portion DP3 toward one side L1 in the axial direction passes through the positioning hole 31 .

[0100] In addition, if Figure 4 As shown, an electric component 32 (such as a capacitor) is provided on the circuit board 30 , the electric component 32 protrudes toward one axial side L1 and is exposed from the potting material 40 , and the electric component 32 is covered and accommodated by the accommodation portion CV2 from one axial side L1 .

[0101] In addition, if Figure 1 As shown, a lead wire 90 is provided on the circuit substrate 30. The lead wire 90 extends from the circuit substrate 30 toward one side L1 in the axial direction, bends radially outward, and passes through the shell 10. The cover CV (the plate-shaped portion CV1 in the illustrated example) is provided with a first hole portion and a second hole portion for the lead wire 90 to pass through.

[0102] (Main Effects of the Present Embodiment)

[0103] According to the pump device 1 of the present embodiment, at least one of the circuit substrate 30 and the housing 10 is provided with a passage portion RP at least at one point in the circumferential direction, the cover CV is provided with a hole portion HP extending through the cover CV in the axial direction, and the gap GP between the circumferentially adjacent coil bodies 231 overlaps with the hole portion HP in the axial direction, and the passage portion RP allows the potting material 40 injected from the hole portion HP into the barrel BP to flow through and cover the coil 23. Therefore, even when the cover CV is assembled to the barrel BP, the potting material 40 can be filled into the barrel BP through the hole portion HP provided in the cover CV, thereby improving the assembly freedom of the cover CV, and by filling the potting material 40 into the hole portion HP that overlaps with the gap GP between the circumferentially adjacent coil bodies 231 in the axial direction, the potting material 40 can be quickly filled into the barrel BP, thereby shortening the filling time.

[0104] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned embodiments.

[0105] For example, in the above-mentioned embodiment, the first avoidance portion RP1 is provided on the circuit substrate 30, but is not limited thereto, and may also be provided on the shell 10 (for example, a recess is provided on the inner wall of the shell 10 to form the first avoidance portion), or, may also be provided on the circuit substrate 30 and the shell 10 at the same time (for example, a recess is provided on the inner wall of the shell 10 and a recess is provided at a position of the circuit substrate 30 opposite to the recess, so that the first avoidance portion is formed by the recess and the recess).

[0106] Furthermore, in the above embodiment, the gap GP, the passage RP and the hole HP between the circumferentially adjacent coil bodies 231 overlap in the axial direction, but the present invention is not limited thereto, and the passage RP may be radially outward of the gap GP and the hole HP.

[0107] Furthermore, in the above-described embodiment, the passage portion RP is formed on the entire outer periphery of the circuit substrate 30 , but the present invention is not limited thereto and may be formed on a portion of the circuit substrate 30 in the circumferential direction.

[0108] In addition, in the above embodiment, the passage portion RP includes a first avoidance portion RP1, but is not limited to this. The avoidance portion RP may also include a second avoidance portion formed by a through hole that penetrates the circuit substrate 30 axially to replace the first avoidance portion RP1, or include the first avoidance portion RP1 and the second avoidance portion at the same time.

[0109] It should be understood that within the scope of the present invention, various parts in the embodiments can be freely combined, or various parts in the embodiments can be appropriately deformed or omitted.

Claims

1. A pump device comprising a housing, a stator and a circuit substrate, wherein the housing comprises: A cylindrical portion extending in the axial direction; and a cover provided at an end portion of one side in the axial direction of the cylinder, the stator is accommodated in the cylinder and comprises: a stator core having a plurality of pole teeth arranged at intervals in the circumferential direction; and a coil having a plurality of coil bodies wound around each of the pole teeth via an insulator, the circuit substrate is accommodated in the cylinder and is axially located between the stator and the cover, the cylinder is filled with a potting material covering the coil and the circuit substrate, and is characterized in that, At least one of the circuit substrate and the shell is provided with a passage portion at least at one point in the circumferential direction, the cover is provided with a hole portion penetrating in the axial direction, and the gap between the circumferentially adjacent coil bodies overlaps with the hole portion in the axial direction, and the passage portion allows the potting material injected into the cylinder from the hole portion to flow through and cover the coil.

2. The pump device according to claim 1, characterized in that Each of the gaps between the coil bodies adjacent to each other in the circumferential direction overlaps with the hole portion in the axial direction.

3. The pump device according to claim 2, characterized in that The hole portion is provided with a plurality of holes spaced apart in the circumferential direction, Each of the gaps between the coil bodies adjacent to each other in the circumferential direction overlaps with the passage portion and the hole portion in the axial direction.

4. The pump device according to claim 1, characterized in that The passage portion includes at least one of a first avoidance portion and a second avoidance portion, The first avoidance portion is a recessed portion provided on the outer periphery of the circuit substrate. The second escape portion is a through hole that penetrates the circuit substrate in the axial direction.

5. The pump device according to claim 4, characterized in that The coil body is electrically connected to the circuit board via a connecting portion. The connecting portion passes through the first avoiding portion.

6. The pump device according to claim 5, characterized in that The connecting portion abuts against the bottom surface and both side surfaces of the first avoiding portion.

7. The pump device according to claim 1, characterized in that The circuit substrate is provided with electrical components. The electrical component protrudes toward one side in the axial direction and is exposed from the potting material. The cover has a plate-shaped portion and a storage portion, The plate-like portion extends in a direction perpendicular to the axial direction and is provided with the hole portion. The housing portion protrudes toward one side in the axial direction from the plate-shaped portion, and covers and houses the electric component from one side in the axial direction.

8. The pump device according to claim 1, characterized in that When viewed in the axial direction, a portion of the hole is shielded by the circuit substrate.

9. The pump device according to claim 1, characterized in that A lead wire is provided on the circuit substrate. The lead wire extends from the circuit substrate toward one side in the axial direction, passes through the hole, and then is bent toward the radially outer side and penetrates the housing.

10. The pump device according to claim 1, characterized in that Also includes rotors and impellers, The rotor is surrounded by the stator from the outside in the radial direction, The impeller is accommodated in the cylindrical portion and is provided on the other side in the axial direction of the rotor.

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