Motor pump

Abstract

To provide a motor pump having characteristics meeting the expectation of demand.SOLUTION: A motor pump comprises an impeller, a pump casing, and a motor casing. The impeller comprises a magnet housing part housing a permanent magnet, a side plate closing an opening end of the magnet housing part, and a main plate connected to the side plate.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a motor pump. [Background technology]

[0002] 2. Description of the Related Art Pump devices are known that include a motor and a pump connected by a coupling, and have a structure in which the driving force of the motor is transmitted to the impeller of the pump via the coupling. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-106323 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-169734 [Patent Document 3] Japanese Patent Application Publication No. 2019-143521 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such pump devices, the pump and motor are arranged side by side, resulting in a large installation area. Meanwhile, in recent years, there has been an increasing demand for compactness, resulting in an increased demand for an integrated pump and motor structure. Furthermore, there is also an increasing demand for pump devices that are low-cost, energy-efficient, and capable of stable operation.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a motor pump having characteristics that meet demand expectations. [Means for solving the problem]

[0006] In one aspect, a motor pump is provided that includes an impeller that houses a permanent magnet, a pump casing that houses the impeller, and a motor casing that houses a motor stator. The impeller includes a magnet housing that houses the permanent magnet, a side plate that closes an open end of the magnet housing, and a main plate that is connected to the side plate.

[0007] In one aspect, the side plate has a side plate side weld portion that is ultrasonically welded to the magnet accommodating portion, and the main plate has a main plate side weld portion that is ultrasonically welded to the side plate.

[0008] In one aspect, a motor pump is provided, comprising an impeller housing a permanent magnet, a pump casing housing the impeller, a motor casing housing a motor stator, and a bearing supporting the impeller for free rotation, the bearing comprising a fixed-side bearing body having an inclined surface arranged opposite to the side of a rotating-side bearing body fixed to the impeller.

[0009] In one embodiment, the inclined surface is a thrust surface that supports the thrust load of the impeller, and has a tapered shape that narrows toward the side surface of the rotation-side bearing body.

[0010] In one aspect, a motor pump is provided, comprising: an impeller housing a permanent magnet; a pump casing housing the impeller; a motor stator having a plurality of stator coils; a motor casing housing the motor stator; a heat dissipation member closing an accommodation space formed within the motor casing; and a substrate connected to the plurality of stator coils and disposed in the accommodation space.

[0011] In one aspect, the substrate is disposed radially outward of an intake port connected to a liquid flow path formed in the motor casing. In one embodiment, the substrate is covered with a potting material that fills the accommodation space. In one embodiment, the potting material fills the accommodation space, forming a gap adjacent to the heat dissipation member.

[0012] In one aspect, a motor pump is provided, comprising an impeller that houses a permanent magnet, a pump casing that houses the impeller, a motor stator that has a stator core, and a motor casing that houses the motor stator, wherein the stator core is a pressed powder iron core in which a tooth portion and a yoke portion are integrally formed.

[0013] In one aspect, there is provided a motor pump including an impeller that houses a permanent magnet, a pump casing that houses the impeller, a motor stator, and a motor casing that houses the motor stator. The motor stator includes a stator core having a plurality of teeth, a plurality of stator coils wound around each of the plurality of teeth, and an insulating coating that covers the contact portions of the stator core with the stator coils.

[0014] In one aspect, the tooth portion has an inner portion arranged on the inner side of the stator core and an outer portion arranged on the outer side of the stator core, and the thickness of the insulating coating portion covering the outer portion is thicker than the thickness of the insulating coating portion covering the inner portion. In one embodiment, the outer portion has a wide portion that widens from the inner periphery side toward the outer periphery side of the stator core, and the insulating coating portion has a thick portion that covers the wide portion.

[0015] In one aspect, a motor pump is provided, comprising: an impeller housing a permanent magnet; a pump casing housing the impeller; a motor stator having a stator core with a plurality of teeth; and a motor casing housing the motor stator. The teeth have an inner portion disposed on the inner circumferential side of the stator core, and the inner portion has a linearly extending flat surface. [Effects of the Invention]

[0016] According to one aspect of the above means, an operator can easily and inexpensively house the permanent magnet and magnet yoke inside the impeller by assembling the divided components, thereby enabling the motor pump to meet demand expectations.

[0017] According to one aspect of the above means, the motor pump includes a circuit board disposed in the housing space, which reduces the space required for routing the stator coil. As a result, the motor pump can be made more compact, meeting demand expectations. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 illustrates an embodiment of a motor pump. [Figure 2] FIG. 1 illustrates an embodiment of a substrate. [Figure 3A] FIG. 3A is a diagram showing a process of filling the housing space of the motor casing with a potting material. [Figure 3B] FIG. 3B is a diagram showing a process of filling the housing space of the motor casing with a potting material. [Figure 4] FIG. 10 is a diagram showing a substrate in contact with the inner surface of a heat dissipation member. [Figure 5] FIG. 1 illustrates an embodiment of an impeller. [Figure 6A] FIG. 6A is a view of the magnet housing portion as seen from the axial direction. [Figure 6B] FIG. 6B is a vertical cross-sectional view of the magnet housing portion. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a diagram showing the magnet housing, side plate, and main plate fixed to each other. [Figure 10] FIG. 1 illustrates an embodiment of a bearing. [Figure 11] FIG. 10 is a diagram showing a spiral groove formed on the side surface of a rotating-side bearing body. [Figure 12] FIG. 2 is a view of a stator core of a motor stator as viewed from the axial direction. [Figure 13] FIG. 13 is a cross-sectional view taken along line AA in FIG. 12. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] 10A and 10B are diagrams showing other embodiments of the stator core; DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the motor pump will be described with reference to the drawings. In the following embodiments, the same or corresponding components are designated by the same reference numerals, and redundant description will be omitted.

[0020] FIG. 1 is a diagram showing one embodiment of a motor pump. In the embodiment shown below, the motor pump MP has several features that meet demand expectations. As shown in FIG. 1, the motor pump MP includes an impeller 1 that houses a permanent magnet 5, a motor stator 6 that generates a magnetic force acting on the permanent magnet 5, a pump casing 2 that houses the impeller 1, a motor casing 3 that houses the motor stator 6, and a bearing 10 that supports the radial load and thrust load of the impeller 1. The motor stator 6 and the bearing 10 are arranged on the suction side of the impeller 1.

[0021] The pump casing 2 and the motor casing 3 are connected to each other by a plurality of connecting bolts (not shown). A seal member (e.g., an O-ring) 9 is disposed between the pump casing 2 and the motor casing 3 to prevent leakage of liquid.

[0022] The impeller 1 and the motor casing 3 face each other with a small gap between them, and the impeller 1 rotates when the rotating magnetic field generated by the motor stator 6 acts on the permanent magnet 5. In this embodiment, the permanent magnet 5 is a single annular permanent magnet magnetized with multiple magnetic poles, but multiple permanent magnets 5 may be provided. The motor pump MP further includes an annular magnet yoke 19 (magnetic body) disposed adjacent to the permanent magnet 5. The permanent magnet 5 is disposed on the suction side of the magnet yoke 19.

[0023] The impeller 1 is rotatably supported by a single bearing 10. The bearing 10 is a sliding bearing (hydrodynamic bearing) that utilizes the dynamic pressure of the liquid. The bearing 10 includes a rotating-side bearing 11 fixed to the impeller 1 and a fixed-side bearing 12 fixed to the motor casing 3. The rotating-side bearing 11 is arranged to surround the liquid inlet of the impeller 1. The fixed-side bearing 12 is arranged on the suction side of the rotating-side bearing 11. The fixed-side bearing 12 has a radial surface 12a that supports the radial load of the impeller 1 and a thrust surface 12b that supports the thrust load of the impeller 1. The radial surface 12a extends parallel to the axis CL of the motor pump MP (i.e., the axis of the impeller 1), and the thrust surface 12b extends perpendicular to the axis CL.

[0024] The rotating-side bearing body 11 has an annular shape. An inner peripheral surface 11a of the rotating-side bearing body 11 faces a radial surface 12a of the fixed-side bearing body 12, and a side surface 11b of the rotating-side bearing body 11 faces a thrust surface 12b of the fixed-side bearing body 12.

[0025] The motor pump MP has a suction port 15 having a suction port 15a fixed to the motor casing 3. A liquid flow path LC is formed at the center of the suction port 15, the motor casing 3, and the bearing 10. The liquid flow path LC extends parallel to the axis CL of the motor pump MP, and forms a single flow path extending from the suction port 15a to the liquid inlet of the impeller 1.

[0026] The motor pump MP is equipped with a discharge port 16 having a discharge port 16a fixed to the pump casing 2. The liquid pressurized by the rotating impeller 1 is discharged to the outside of the motor pump MP through the discharge port 16a. The discharge port 16a is disposed radially outward of the impeller 1, and the suction port 15a is disposed in a direction perpendicular to the radial direction of the impeller 1 (i.e., in the direction of the axis CL). In this way, the motor pump MP, in which the suction port 15a and the discharge port 16a intersect at right angles, is a so-called end-top type motor pump.

[0027] As shown in FIG. 1, the motor stator 6 includes a stator core 6A having an annular shape and a plurality of stator coils 6B wound around the stator core 6A. The motor casing 3 has an accommodation space SP formed therein that has an annular recessed structure, and the motor stator 6 is accommodated in the accommodation space SP. The accommodation space SP is disposed radially outward of a suction port 15 connected to the liquid flow path LC. By accommodating the motor stator 6 in the accommodation space SP, the motor stator 6 is disposed concentrically with the liquid flow path LC. In one embodiment, the stator core 6A may be composed of a plurality of members arranged in an annular shape.

[0028] The stator coils 6B each have an extension of a winding connected to a substrate 50, and a wiring pattern for driving the multiple stator coils 6B is printed on the substrate 50. Lead wires 40 are further connected to the substrate 50, and are connected to an external power source (not shown) for the motor pump MP. The substrate 50 is disposed in the accommodation space SP of the motor casing 3 so as to be concentric with the liquid flow path LC.

[0029] According to this embodiment, the motor pump MP has a compact structure because it includes the substrate 50 disposed in the accommodation space SP of the motor casing 3. Generally, the stator coil 6B of the motor stator 6 must be connected to a power source. Usually, the stator coils 6B must be insulated with a glass tube or the like, and then the stator coils 6B must be connected to each other by soldering, welding, or the like.

[0030] This configuration requires a space for routing the stator coil 6B, which may result in an increase in the size of the motor pump. Furthermore, the worker must perform the complicated wiring work for the stator coil 6B, which may result in incorrect wiring.

[0031] In this embodiment, the motor pump MP includes a substrate 50, and an operator can assemble the motor pump MP by the simple method of simply connecting the lead wires 40 to the substrate 50. As a result, the operator can reduce the time required to assemble the motor pump MP, and can also reduce errors in the wiring work.

[0032] As shown in FIG. 1, the accommodation space SP is closed by a heat dissipation member 20. The heat dissipation member 20 is disposed between the motor casing 3 and the suction port 15 and serves as a motor cover that closes the accommodation space SP. In one embodiment, the heat dissipation member 20 may be made of a material having a higher thermal conductivity than the motor casing 3. Such a material may be, for example, a metal such as stainless steel or aluminum, or a ceramic.

[0033] The motor pump MP includes a heat transfer ring 35 disposed between the heat dissipation member 20 and the stator core 6A of the motor stator 6. The heat transfer ring 35 is disposed concentrically with the liquid flow path LC and is in contact with both the stator core 6A and the heat dissipation member 20. The heat transfer ring 35 is preferably made of the same material as the heat dissipation member 20.

[0034] The motor stator 6 is a heat-generating body. More specifically, when a current is passed through the stator coil 6B of the motor stator 6, the stator coil 6B generates heat. A portion of the heat is transferred to the heat dissipation member 20 through the stator core 6A and the heat transfer ring 35. The heat transferred to the heat dissipation member 20 is efficiently diffused into the outside air via the heat dissipation member 20.

[0035] FIG. 2 is a diagram showing one embodiment of the substrate. As shown in FIG. 2, the substrate 50 has land portions 51 to be connected to the lead wires 40, and a wiring pattern (not shown) is printed on the surface of the substrate 50. In this embodiment, the substrate 50 has an annular shape and is disposed radially outward of the suction port 15. The structure of the substrate 50 is not particularly limited as long as it can be disposed in the accommodation space SP. In one embodiment, the substrate 50 may have a C-shape, a semicircular shape, or may be composed of multiple divided bodies. In another embodiment, the substrate 50 may have a rectangular shape that can be accommodated in the accommodation space SP.

[0036] 3A and 3B are diagrams showing the process of filling the accommodation space SP with potting material. As shown in Fig. 3A, an operator places the substrate 50 and the heat transfer ring 35 with the substrate 50 attached in the accommodation space SP. Then, as shown in Fig. 3B, an operator fills the accommodation space SP with potting material (e.g., silicone resin) 55.

[0037] After filling the potting material 55, the worker closes the accommodation space SP with the heat dissipation member 20 and attaches the suction port 15 to the motor casing 3. By attaching the suction port 15, the heat dissipation member 20 is sandwiched between the motor casing 3 and the suction port 15.

[0038] 3B, the entire substrate 50 is covered with a potting material 55 that fills the accommodation space SP. The potting material 55 that covers the substrate 50 can protect the substrate 50 from liquids such as moisture.

[0039] In the embodiment shown in Fig. 3B, a gap SPa is formed between the potting material 55 and the inner surface 20a of the heat dissipation member 20. The potting material 55 may expand due to the heat of the motor stator 6. By forming the gap SPa, it is possible to prevent the heat dissipation member 20 from being deformed or damaged due to the expansion of the potting material 55. The heat dissipation member 20 has an outer surface 20b located opposite the inner surface 20a, and the outer surface 20b is in contact with the outside air.

[0040] 4 is a diagram showing a substrate in contact with the inner surface of a heat dissipation member. As shown in FIG. 4, the substrate 50 may be in contact with the inner surface 20a of the heat dissipation member 20. In this embodiment, the substrate 50 is disposed in the accommodation space SP that accommodates the motor stator 6, which is a heat generating element. Therefore, there is a possibility that the substrate 50 will be affected by the heat of the motor stator 6. Therefore, by bringing the substrate 50 into contact with the inner surface 20a of the heat dissipation member 20, the influence of heat on the substrate 50 is suppressed.

[0041] The motor pump MP has an impeller 1 with a distinctive structure to meet demand expectations (for example, stable operation of the motor pump MP and low cost of the motor pump MP). The structure of the impeller 1 will be described below with reference to the drawings.

[0042] Fig. 5 is a diagram showing one embodiment of an impeller. In the embodiment shown in Fig. 5, the impeller 1 includes a magnet housing portion 100 that houses a permanent magnet 5 (and a magnet yoke 19), a side plate 101 that closes an open end 100a of the magnet housing portion 100, and a main plate 102 connected to the side plate 101. The impeller 1 is made of a non-magnetic material that is slippery and resistant to wear. An example of this material is a resin such as PPS (polyphenylene sulfide).

[0043] Fig. 6A is a view of the magnet storage unit as seen from the axial direction. Fig. 6B is a longitudinal cross-sectional view of the magnet storage unit. As shown in Figs. 6A and 6B, the magnet storage unit 100 has an annular recess 105 having an annular shape, and the permanent magnet 5 and the magnet yoke 19 are mounted in the annular recess 105.

[0044] Fig. 7 is a view of the side plate as viewed from the axial direction. As shown in Fig. 7, the side plate 101 has an annular shape and has multiple flow paths 110 that extend spirally from the inner peripheral surface 101a to the outer peripheral surface 101b of the side plate 101. Each of the multiple flow paths 110 has a concave shape. The side plate 101 can be attached to the magnet accommodating unit 100. With the permanent magnet 5 and magnet yoke 19 attached to the annular recess 105 of the magnet accommodating unit 100, the annular recess 105 is closed by attaching the side plate 101 to the magnet accommodating unit 100.

[0045] Fig. 8 is a view of the main plate as viewed from the axial direction. As shown in Fig. 8, the main plate 102 has a disk shape and has a plurality of flow passages 111 that extend spirally from the center of the main plate 102 outward. Each of the plurality of flow passages 111 has a convex shape. The flow passages 111 of the main plate 102 and the flow passages 110 of the side plates 101 correspond to each other, and by attaching the main plate 102 to the side plates 101, the impeller 1 has blades formed therein by the flow passages 110, 111. In other words, the combination of the flow passages 110, 111 constitutes a blade.

[0046] Fig. 9 is a diagram showing the magnet storage unit, side plate, and main plate fixed to one another. As shown in Fig. 9, side plate 101 has side plate-side welded portions 115 and 116 that are ultrasonically welded to magnet storage unit 100, and main plate 102 has main plate-side welded portion 117 that is ultrasonically welded to side plate 101.

[0047] Side plate welded portion 115 is disposed on the outer peripheral surface 101b side of side plate 101, and side plate welded portion 116 is disposed on the inner peripheral surface 101a side of side plate 101. Impeller 1 has a structure that allows liquid to pass through the interior of impeller 1, and houses permanent magnets 5 and magnet yoke 19. Therefore, impeller 1 has a structure that prevents liquid from entering magnet housing portion 100.

[0048] More specifically, the worker ultrasonically vibrates side plate-side welded portions 115, 116 of side plate 101 to melt these welded portions 115, 116 with frictional heat, and in this state, fixes them to magnet accommodating portion 100. Welded portion 115 is disposed radially outward of magnet 5 and magnet yoke 19, and welded portion 116 is disposed radially inward of magnet 5 and magnet yoke 19. Therefore, impeller 1 can reliably prevent liquid from entering magnet accommodating portion 100. In this embodiment, magnet accommodating portion 100 and side plate 101 have a fitting structure, which more reliably prevents liquid from entering magnet accommodating portion 100.

[0049] The main plate side welded portion 117 is disposed on the outer periphery of the main plate 102 (i.e., outside the flow path 111). With this arrangement, the main plate side welded portion 117 does not obstruct the flow of liquid passing through the flow paths 110, 111. In this embodiment, the side plate 101 and the main plate 102 have a fitting structure.

[0050] The motor pump MP has a structure in which the permanent magnets 5 and the magnet yoke 19 are housed inside the impeller 1. In this embodiment, an operator can house the permanent magnets 5 and the magnet yoke 19 inside the impeller 1 easily and at low cost by assembling a plurality of separated components (i.e., the magnet housing portion 100, the side plate 101, and the main plate 102).

[0051] Furthermore, according to this embodiment, even if the components of the impeller 1 (i.e., the magnet accommodating portion 100, the side plate 101, and the main plate 102) are made of a resin such as PPS, these components can be fixed easily and at low cost. Furthermore, by providing side plate side welded portions 115 and 116 on the side plate 101 and main plate side welded portion 117 on the main plate 102, it is possible to prevent liquid from penetrating the magnets 5 and magnet yoke 19 while not impeding the flow of liquid, thereby achieving stable operation of the motor pump MP.

[0052] The motor pump MP has a bearing 10 with a distinctive structure in order to meet demand expectations (for example, stable operation of the motor pump MP). The structure of the bearing 10 will be described below with reference to the drawings.

[0053] Fig. 10 is a diagram showing one embodiment of a bearing. As shown in Fig. 10, bearing 10 includes fixed-side bearing body 12 having an inclined surface arranged opposite side surface 11b of rotating-side bearing body 11 fixed to impeller 1. The inclined surface is thrust surface 12b that supports the thrust load of impeller 1.

[0054] A portion of the liquid discharged from the impeller 1 is guided to the bearing 10 through the small gap between the impeller 1 and the motor casing 3. When the rotating-side bearing 11 rotates together with the impeller 1, dynamic pressure of the liquid is generated between the rotating-side bearing 11 and the fixed-side bearing 12, and the impeller 1 is supported without contact by the bearing 10. The fixed-side bearing 12 supports the rotating-side bearing 11 by means of a radial surface 12a and a thrust surface 12b that are orthogonal to each other, so tilting of the impeller 1 is restricted by the bearing 10.

[0055] Because the permanent magnet 5 is housed in the impeller 1, a magnetic force acts between the permanent magnet 5 and the motor stator 6. More specifically, this magnetic force causes the side surface 11b of the rotating-side bearing 11 fixed to the impeller 1 to move closer to the thrust surface 12b of the fixed-side bearing 12. Therefore, when the motor pump MP starts, the rotating-side bearing 11 slides strongly against the fixed-side bearing 12. As a result, the bearing 10 wears, which may shorten the life of the bearing 10.

[0056] Therefore, in order to achieve stable operation of the motor pump MP, the thrust surface 12b of the fixed-side bearing body 12 has a tapered shape that narrows toward the side surface 11b of the rotating-side bearing body 11. In other words, the thrust surface 12b has a tapered shape such that the cross-sectional area of ​​the thrust surface 12b gradually decreases toward the side surface 11b of the rotating-side bearing body 11. The inclination angle of the thrust surface 12b is an inclination angle that does not affect the dynamic pressure of the liquid generated between the side surface 11b of the rotating-side bearing body 11 and the thrust surface 12b of the fixed-side bearing body 12.

[0057] According to this embodiment, the contact area between the side surface 11b of the rotating-side bearing body 11 and the thrust surface 12b of the fixed-side bearing body 12 can be reduced, and as a result, the frictional force of the bearing 10 caused by the rotation of the impeller 1 when the motor pump MP starts can be suppressed. As a result, the life of the bearing 10 can be extended, and stable operation of the motor pump MP can be achieved.

[0058] FIG. 11 is a diagram showing spiral grooves formed on the side surface of the rotating-side bearing body. As shown in FIG. 11, the bearing 10 may have multiple spiral grooves 118 formed on the side surface 11b of the rotating-side bearing body 11. The multiple spiral grooves 118 extending in a spiral shape are formed to generate dynamic pressure by a wedge effect. In the embodiment shown in FIG. 11, the spiral grooves 118 are formed on the side surface 11b of the rotating-side bearing body 11, but the spiral grooves 118 may also be formed on the inner circumferential surface 11a of the rotating-side bearing body 11. In one embodiment, the spiral grooves 118 may be formed on at least one of the radial surface 12a and the thrust surface 12b of the fixed-side bearing body 12.

[0059] The motor pump MP has a motor stator 6 with a distinctive structure in order to meet demand expectations (for example, cost reduction of the motor pump MP). The structure of the motor stator 6 will be described below with reference to the drawings.

[0060] Fig. 12 is a view of the stator core of the motor stator as viewed from the axial direction. Fig. 13 is a cross-sectional view taken along line AA in Fig. 12. As shown in Figs. 12 and 13, the stator core 6A of the motor stator 6 includes a plurality of teeth 6A-1 and a yoke portion 6A-2 integrally formed with the plurality of teeth 6A-1. The yoke portion 6A-2 has an annular shape, and the teeth 6A-1 extend from the yoke portion 6A-2 in the direction of the axis CL and are arranged at equal intervals around the circumferential direction of the yoke portion 6A-2.

[0061] The stator core 6A is a powdered iron core in which the teeth 6A-1 and the yoke 6A-2 are integrally formed. According to this embodiment, by forming the stator core 6A from a powdered iron core, the manufacturing cost of the stator core 6A can be reduced. Generally, when manufacturing a stator core, it is necessary to stack silicon steel plates and then perform a process (cutting process) of cutting the teeth portions from the stacked silicon steel plates. However, such a process is cumbersome. In this embodiment, the stator core 6A as a powdered iron core is manufactured by powder metallurgy. Therefore, the cutting process can be omitted, and the manufacturing cost of the stator core 6A can be reduced.

[0062] Fig. 13 is a diagram showing an insulating coating portion that covers the contact portion of the stator core with the stator coil. As shown in Fig. 13, the motor stator 6 has an insulating coating portion 120 that covers the contact portion 121 of the stator core 6A with the stator coil 6B. The contact portion 121 is the entire tooth portion 6A-1 and a part of the yoke portion 6A-2, and the insulating coating portion 120 covers the contact portion 121. With this configuration, the insulating coating portion 120 can ensure insulation between the stator core 6A and the stator coil 6B.

[0063] Generally, the contact portions 121 of the teeth 6A-1 must be covered with insulating paper or coated with insulating paint. However, in this embodiment, the teeth 6A-1 protrude from the yoke 6A-2, making it cumbersome to cover the entire contact portions 121 of the teeth 6A-1 with insulating paper. Furthermore, if insulating paint is applied, a drying process is required. In this embodiment, the insulating coating 120 is a thin film made of resin, eliminating the need for a drying process, thereby reducing the manufacturing cost of the motor pump MP.

[0064] Fig. 14 is an enlarged view of the tooth portion. As shown in Fig. 14, the tooth portion 6A-1 has an inner portion 130 arranged on the inner periphery side of the stator core 6A and an outer portion 131 arranged on the outer periphery side of the stator core 6A. The thickness of the insulating coating portion 120 covering the outer portion 131 is thicker than the thickness of the insulating coating portion 120 covering the inner portion 130. More specifically, the outer portion 131 of the tooth portion 6A-1 has wide portions 131a, 131a that widen from the inner periphery side toward the outer periphery side of the stator core 6A. The insulating coating portion 120 has thick portions 120a that cover the wide portions 131a, 131a.

[0065] The thickness of the thick portion 120a of the insulating coating portion 120 covering the wide portions 131a, 131a is greater than the thickness of the insulating coating portion 120 covering other portions of the tooth portion 6A-1. In other words, the curvature of the thick portion 120a is greater than the curvature of the wide portion 131a. That is, the radius of curvature of the thick portion 120a is smaller than the radius of curvature of the wide portion 131a.

[0066] If the curvature of the wide portion 131a is increased, the wide portion 131a may chip. This is particularly true when the stator core 6A is made of a powdered iron core. This increases the manufacturing cost of the motor pump MP, making it impossible to reduce the cost of the motor pump MP. If the curvature of the thick portion 120a is reduced, the resin constituting the insulating coating 120 may not flow smoothly into the teeth 6A-1 during the process of coating the teeth 6A-1 with the insulating coating 120. In this case, the stator core 6A cannot ensure sufficient insulation from the stator coil 6B, resulting in increased manufacturing costs for the motor pump MP.

[0067] According to this embodiment, the motor stator 6 has a wide portion 131a having a first curvature and a thick portion 120a having a second curvature larger than the first curvature, which reduces the manufacturing cost of the motor stator 6 and, as a result, reduces the cost of the motor pump MP.

[0068] In order to reduce the manufacturing cost of the motor stator 6, the inner portion 130 of the tooth portion 6A-1 has a flat surface 130a that extends linearly along the axis CL. The flat surface 130a extends linearly along the axis CL (see FIG. 14).

[0069] Fig. 15 is a diagram showing a stator coil. As shown in Fig. 15, the stator coil 6B is manufactured by winding wire (winding) 135 in multiple layers around the teeth 6A-1 of the stator core 6A so that no gaps are formed between the teeth 6A-1 and the stator coil 6B. In Fig. 15, the wire 135 at the start of the winding is a winding start wire 135A, and the wire 135 at the end of the winding is a winding end wire 135B. The winding start wire 135A and the winding end wire 135B are each connected to a substrate 50.

[0070] For example, if the inner portion 130 has an arcuate surface recessed toward the outer portion 131, it is necessary to perform a process of forming the surface of the stator coil 6B corresponding to the arcuate surface of the inner portion 130 into an arcuate shape (arc forming process). However, adding such a process does not reduce the manufacturing cost of the motor stator 6, and as a result, it is not possible to reduce the cost of the motor pump MP. Therefore, by forming a flat surface 130a on the inner portion 130 of the tooth portion 6A-1, it is not necessary to perform the arcuate forming process, and it is possible to reduce the manufacturing cost of the motor stator 6.

[0071] FIG. 16 is a diagram showing another embodiment of the stator core. As shown in FIG. 16, the stator core 6A has a storage step 140 formed between the tooth portion 6A-1 and the yoke portion 6A-2. The winding start wire 135A is disposed in the storage step 140. In the embodiment shown in FIG. 16, the storage step 140 has an annular shape and is sized to accommodate the winding start wire 135A. In one embodiment, the storage step 140 does not necessarily have to have an annular shape as long as it can accommodate the winding start wire 135A. The number of storage steps 140 may correspond to the number of winding start wires 135A of the stator coil 6B.

[0072] Forming such a housing step 140 prevents breakage of the winding start wire 135A due to close contact between the winding start wire 135A and the yoke portion 6A-2, even when the motor stator 6 is mounted in the motor casing 3. As a result, stable operation of the motor pump MP can be achieved.

[0073] In the above-described embodiment, the motor pump MP has multiple features that meet demand expectations. These multiple features may be combined as appropriate, and the motor pump MP may have one of these multiple features. In one embodiment, the motor pump MP may include, as one of the features, a substrate 50 arranged in the accommodation space SP. In one embodiment, the motor pump MP may include, as one of the features, an impeller 1 made up of multiple components. In one embodiment, the motor pump MP may include, as one of the features, a bearing 10 having an inclined thrust surface 12b. In one embodiment, the motor pump MP may include, as one of the features, a stator core 6A made from a powder iron core. In one embodiment, the motor pump MP may include, as one of the features, a motor stator 6 having an insulating coating portion. In one embodiment, the motor pump MP may include, as one of the features, a teeth portion 6A-1 having a flat surface 130a.

[0074] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and may of course be embodied in various different forms within the scope of the technical concept thereof. [Explanation of symbols]

[0075] 1 impeller 2 Pump casing 3 Motor casing 5. Permanent magnets 6 Motor stator 6A stator core 6A-1 Teeth part 6A-2 Yoke 6B Stator coil 9 Sealing material 10 Bearings 11 Rotating side bearing body 11a Inner surface 11b Side 12 Fixed side bearing body 12a Radial surface 12b Thrust surface 15 Suction port 15a Intake port 16 Discharge port 16a Discharge port 19 Magnetic Yoke 20 Heat dissipation material 20a inner surface 20b External surface 35 Heat transfer ring 40 lead wire 50 boards 51 Land Department 55 Potting material 100 magnet housing 100a open end 101 Side panel 101a Inner surface 101b Outer surface 102 Main plate 105 Annular recess 110 Flow path 111 Flow path 115,116 Side plate side welding part 117 Main plate side welding part 118 Spiral Groove 120 Insulation coating section 120a thick part 121 Contact site 130 Internal part 130a flat surface 131 External part 131a wide section 135 Wire rod 135A winding start wire 135B End of winding wire 140 Storage section MP motor pump LC liquid flow path SP Containment Space

Claims

1. an impeller containing a permanent magnet; a pump casing that houses the impeller; a motor casing that houses a motor stator; The impeller is a magnet housing portion that houses the permanent magnet; a side plate that closes the open end of the magnet accommodating portion; a main plate connected to the side plate.

2. the side plate has a side plate-side welded portion that is ultrasonically welded to the magnet accommodating portion, 2. The motor pump according to claim 1, wherein the main plate has a main plate-side weld portion that is ultrasonically welded to the side plate.

3. an impeller containing a permanent magnet; a pump casing that houses the impeller; a motor casing that houses a motor stator; a bearing that rotatably supports the impeller, A motor pump, wherein the bearing comprises a fixed-side bearing body having an inclined surface arranged opposite to a side surface of a rotating-side bearing body fixed to the impeller.

4. 4. The motor pump according to claim 3, wherein the inclined surface is a thrust surface that supports a thrust load of the impeller, and has a tapered shape that narrows toward a side surface of the rotating-side bearing body.

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