Motor pump

Abstract

The present invention can be used in motor pumps. The motor pump (MP) includes: an impeller (1), a pump housing (2), a motor stator (6), a motor housing (3), a heat dissipation component (20), and a base plate (50) disposed in a housing space (SP).

Description

Technical Field

[0001] This invention relates to a motor pump. Prior Technology

[0002] There are conventional pumping devices that connect a motor and a pump via a coupling. Such pumping devices have a structure that transmits the driving force of the motor to the impeller of the pump via the coupling. [Previous Technical Documents] [Patent Literature]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2011-106323 [Patent Document 2] Japanese Patent Application Publication No. 2016-169734 [Patent Document 3] Japanese Patent Application Publication No. 2019-143521 Summary of the Invention

[0004] (The problem the invention aims to solve)

[0005] However, because the pump and motor of this type of pumping device are arranged in parallel, the installation area becomes larger. In addition, the increasing demand for miniaturization in recent years has also increased the requirements for the integrated structure of the pump and motor. Furthermore, there is also an increased demand for pumping devices that are low-cost, energy-efficient, and capable of stable operation.

[0006] Therefore, the object of the present invention is to provide a motor pump with features that are expected to meet specific needs. (Solutions)

[0007] One embodiment provides a motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor stator having a plurality of stator coils; a motor housing housing the motor stator; a heat dissipation member enclosing a housing space formed within the motor housing; and a substrate connected to the plurality of stator coils and disposed within the housing space.

[0008] One configuration involves the aforementioned substrate being positioned radially outside the suction port, which is connected to the liquid flow path formed in the aforementioned motor housing. One configuration is that the aforementioned substrate is covered with potting material that fills the aforementioned containment space. One configuration involves the aforementioned infusion material forming a gap adjacent to the aforementioned heat dissipation component, thereby filling the aforementioned containment space.

[0009] One embodiment provides a motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; and a motor housing housing a motor stator. The impeller comprises: a magnet housing portion housing the permanent magnet; a side plate closing the opening of the magnet housing portion; and a main plate connected to the side plate.

[0010] One configuration is that the aforementioned side panel has a side panel side welding portion ultrasonically welded to the aforementioned magnet receiving portion, and the aforementioned main board has a main board side welding portion ultrasonically welded to the aforementioned side panel.

[0011] One embodiment provides a motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor housing housing a motor stator; and a bearing rotatably supporting the impeller; wherein the bearing has a fixed-side bearing body having an inclined surface disposed opposite to the side of the rotating-side bearing body fixed to the impeller.

[0012] One type is a thrust surface that supports the thrust load of the impeller and has a tapered shape that narrows toward the side of the rotating bearing body.

[0013] One embodiment provides a motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor stator having a stator core; and a motor housing housing the motor stator; wherein the stator core is a powder-pressed iron core integrally formed by teeth and a yoke.

[0014] One embodiment provides a motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor stator; and a motor housing housing the motor stator. The motor stator comprises: a stator core having a plurality of teeth; a plurality of stator coils wound around the plurality of teeth; and an insulating coating covering the contact portions of the stator core that contact the stator coils.

[0015] One configuration has the aforementioned tooth portion having: an inner portion disposed on the inner periphery of the aforementioned stator core; and an outer portion disposed on the outer periphery of the aforementioned stator core; the thickness of the aforementioned insulating coating covering the aforementioned outer portion is greater than the thickness of the aforementioned insulating coating covering the aforementioned inner portion. One configuration has a wide portion that widens from the inner periphery of the stator core toward the outer periphery, and the insulating coating portion has a thick portion that covers the wide portion.

[0016] One embodiment provides a motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor stator having a stator core having a plurality of teeth; and a motor housing housing the motor stator. The teeth have an inner portion disposed on the inner periphery of the stator core, the inner portion having a linearly extending flat surface. (Effects of the invention)

[0017] Because the motor pump has a substrate disposed within the housing space, the space required for winding the stator coil can be reduced. As a result, the motor pump can be miniaturized to meet the desired requirements. Simple Explanation of the Diagram

[0018] Figure 1 shows one embodiment of the motor pump. Figure 2 is a diagram of one embodiment of the display substrate. Figure 3A shows the process of filling the receiving space of the motor housing with injection material. Figure 3B shows the process of filling the receiving space of the motor housing with injection material. Figure 4 shows a substrate in contact with the inner surface of the heat dissipation component. Figure 5 shows one embodiment of the impeller. Figure 6A is a view of the magnet housing section from the axial direction. Figure 6B is a longitudinal cross-sectional view of the magnet housing. Figure 7 is a view of the side panel from the axial direction. Figure 8 is a view of the motherboard from the axial direction. Figure 9 shows the magnet housing, side plate, and main board that are fixed to each other. Figure 10 shows one embodiment of the bearing. Figure 11 shows the spiral groove formed on the side of the rotating bearing body. Figure 12 is a view of the stator center of the motor stator from the axial direction. Figure 13 is a cross-sectional view along line AA in Figure 12. Figure 14 is an enlarged view of the toothed section. Figure 15 shows a diagram of the stator coils. Figure 16 shows other embodiments of the stator center. Implementation

[0019] The following describes an embodiment of the motor pump with reference to the drawings. In the following embodiments, the same symbols are used on the same or equivalent components, and repeated descriptions are omitted.

[0020] Figure 1 shows one embodiment of the motor pump. The motor pump MP of the embodiment shown below has several features that meet desired requirements. As shown in Figure 1, the motor pump MP includes: an impeller 1 housing a permanent magnet 5; a motor stator 6 generating a magnetic force acting on the permanent magnet 5; a pump housing 2 housing the impeller 1; a motor housing 3 housing the motor stator 6; and a bearing 10 supporting the radial and thrust loads 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 housing 2 and the motor housing 3 are connected to each other by a plurality of connecting bolts (not shown). A sealing member 9 (e.g., an O-ring) is provided between the pump housing 2 and the motor housing 3 to prevent liquid leakage.

[0022] The impeller 1 and the motor housing 3 are positioned opposite each other through a small gap. The impeller 1 rotates by the rotating magnetic field generated by the motor stator 6 acting on the permanent magnet 5. In this embodiment, the permanent magnet 5 is a ring-shaped permanent magnet with a plurality of magnetic poles magnetized, although a plurality of permanent magnets 5 may also be provided. The motor pump MP further includes a ring-shaped magnetic yoke 19 (magnetic body) arranged adjacent to the permanent magnet 5. The permanent magnet 5 is disposed on the suction side of the magnetic yoke 19.

[0023] The impeller 1 is rotatably supported by a single bearing 10. The bearing 10 is a sliding bearing (hydrodynamic bearing) utilizing the dynamic pressure of the liquid. The bearing 10 includes: a rotating side bearing body 11 fixed to the impeller 1; and a fixed side bearing body 12 fixed to the motor housing 3. The rotating side bearing body 11 is arranged to surround the liquid inlet of the impeller 1. The fixed side bearing body 12 is arranged on the suction side of the rotating side bearing body 11. The fixed side bearing body 12 has: a radial surface 12a supporting the radial load of the impeller 1; and a thrust surface 12b supporting 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 bearing body 11 has an annular shape. The inner circumferential surface 11a of the rotating bearing body 11 is opposite to the radial surface 12a of the fixed bearing body 12, and the side surface 11b of the rotating bearing body 11 is opposite to the thrust surface 12b of the fixed bearing body 12.

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

[0026] The motor pump MP has a discharge port 16a fixed to the pump casing 2. 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 located on the outer side of the impeller 1 in the radial direction, and the suction port 15a is located in a direction perpendicular to the radial direction of the impeller 1 (i.e., in the direction of the axis CL). Therefore, the motor pump MP with the suction port 15a and the discharge port 16a orthogonal is called an end-top type motor pump.

[0027] As shown in Figure 1, the motor stator 6 includes: a stator core 6A with an annular shape; and a plurality of stator coils 6B wound around the stator core 6A. The motor housing 3 has a receiving space SP formed therein with an annular concave structure, and the motor stator 6 is received in the receiving space SP. The receiving space SP is arranged radially outside the suction port 15 connected to the liquid flow path LC. By receiving the motor stator 6 in the receiving space SP, the motor stator 6 and the liquid flow path LC are arranged concentrically. In one embodiment, the stator core 6A may also be composed of a plurality of components arranged in an annular shape.

[0028] In the stator coil 6B, the extensions of the windings from the stator coil 6B are respectively connected to the substrate 50. The substrate 50 is printed with wiring patterns for driving the plurality of stator coils 6B. Wires 40 are further connected to the substrate 50, which are connected to a power supply (not shown) external to the motor pump MP. The substrate 50 is arranged concentrically with the liquid flow path LC in the receiving space SP of the motor housing 3.

[0029] In this embodiment, because the motor pump MP has a substrate 50 disposed in the receiving space SP of the motor housing 3, a compact structure can be achieved. Generally, the stator coils 6B of the motor stator 6 need to be connected to the power supply. Usually, the stator coils 6B need to be insulated with glass fiber sleeves or the like, and then connected by means of soft soldering or welding.

[0030] This configuration requires ensuring sufficient space for winding the stator coil 6B, potentially increasing the size of the motor pump. Furthermore, it necessitates complex wiring work for the stator coil 6B, which could lead to incorrect wiring.

[0031] In this embodiment, the motor pump MP is equipped with a base plate 50, and the operator can assemble the motor pump MP by simply connecting the wires 40 to the base plate 50. As a result, the operator can shorten the assembly time of the motor pump MP and further reduce wiring errors.

[0032] As shown in Figure 1, the receiving space SP is filled by the heat dissipation member 20. The heat dissipation member 20 is disposed between the motor housing 3 and the intake port 15, and serves as a motor cover for filling the receiving space SP. In one embodiment, the heat dissipation member 20 may also be made of a material with a higher thermal conductivity than the motor housing 3. Such a material is, for example, a metal such as stainless steel or aluminum, or ceramic.

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

[0034] The motor stator 6 is a heating element. More specifically, when current flows into the stator coil 6B of the motor stator 6, the stator coil 6B will heat up. Part of the heat is transferred to the heat dissipation component 20 through the stator core 6A and the heat transfer ring 35. The heat transferred to the heat dissipation component 20 is effectively diffused into the outside air through the heat dissipation component 20.

[0035] Figure 2 shows one embodiment of the substrate. As shown in Figure 2, the substrate 50 has a solder ring (Land) portion 51 connected to the wire 40, and a wiring pattern (not shown) is printed on the surface of the substrate 50. The substrate 50 of this embodiment has an annular shape and is disposed on the outer side of the suction port 15 in the radial direction. The structure of the substrate 50 is not particularly limited, as long as it can be disposed in the receiving space SP. In one embodiment, the substrate 50 may also have a C-shape, a semi-circular shape, or be composed of a plurality of segments. In other embodiments, the substrate 50 may also have a square shape with dimensions that can be accommodated in the receiving space SP.

[0036] Figures 3A and 3B are process diagrams showing the filling of the receiving space of the motor housing with potting material. As shown in Figure 3A, the operator places the substrate 50 and the heat transfer ring 35 on which the substrate 50 is mounted in the receiving space SP. Then, as shown in Figure 3B, the operator fills the receiving space SP with potting material (e.g., silicone resin).

[0037] After filling the injection material 55, the operator fills the receiving space SP with the heat dissipation component 20 and installs the suction port 15 on the motor housing 3. By installing the suction port 15, the heat dissipation component 20 is sandwiched between the motor housing 3 and the suction port 15.

[0038] As shown in Figure 3B, the entire substrate 50 is covered by potting material 55 filling the receiving space SP. The potting material 55 covering the substrate 50 can protect the substrate 50 from the influence of moisture and other liquids.

[0039] The embodiment shown in Figure 3B has a gap SPa 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 from the motor stator 6. By forming the gap SPa, deformation or damage to the heat dissipation member 20 due to the expansion of the potting material 55 can be prevented. The heat dissipation member 20 has an outer surface 20b disposed on the opposite side of its inner surface 20a, which is in contact with the outside air.

[0040] Figure 4 shows the substrate 50 in contact with the inner surface of the heat dissipation member. As shown in Figure 4, the substrate 50 can also contact the inner surface 20a of the heat dissipation member 20. In this embodiment, the substrate 50 is disposed in the housing space SP of the motor stator 6 that houses the heat-generating element. Therefore, the substrate 50 may be affected by the heat of the motor stator 6. Therefore, by contacting the inner surface 20a of the heat dissipation member 20, the heat effect on the substrate 50 is suppressed.

[0041] To meet specific requirements (e.g., stable operation of the motor pump MP, cost reduction of the motor pump MP), the motor pump MP has an impeller 1 with a characteristic structure. Hereinafter, the structure of the impeller 1 will be described with reference to the drawings.

[0042] Figure 5 shows one embodiment of the impeller. The embodiment shown in Figure 5 has an impeller 1 comprising: a magnet housing 100 housing a permanent magnet 5 (and a yoke 19); a side plate 101 closing the open end 100a of the magnet housing 100; and a main plate 102 connected to the side plate 101. The impeller 1 is made of a non-magnetic material that is easy to slide and resistant to wear. Examples of such materials include resins such as PPS (polyphenylene sulfide).

[0043] Figure 6A is a view of the magnet receiving part from the axial direction. Figure 6B is a longitudinal sectional view of the magnet receiving part. As shown in Figures 6A and 6B, the magnet receiving part 100 has an annular recess 105 with an annular shape, and the permanent magnet 5 and the yoke 19 are mounted in the annular recess 105.

[0044] Figure 7 is a view of the side plate from the axial direction. As shown in Figure 7, the side plate 101 has an annular shape and a plurality of flow paths 110 extending spirally from the inner peripheral surface 101a of the side plate 101 towards the outer peripheral surface 101b. Each of the plurality of flow paths 110 has a concave shape. The side plate 101 can be mounted in the magnet receiving portion 100. The annular recess 105 is closed by mounting the side plate 101 in the magnet receiving portion 100 with the permanent magnet 5 and the yoke 19 mounted in the annular recess 105 of the magnet receiving portion 100.

[0045] Figure 8 is a view of the mainboard from the axial direction. As shown in Figure 8, the mainboard 102 has a disc shape and a plurality of flow paths 111 extending spirally outward from the center of the mainboard 102. Each of the flow paths 111 has a convex shape. The flow paths 111 of the mainboard 102 and the flow paths 110 of the side plate 101 correspond to each other. By mounting the mainboard 102 to the side plate 101, the impeller 1 has wings inside it formed by the flow paths 110 and 111. In other words, the flow paths 110 and 111 together constitute wings.

[0046] Figure 9 shows the magnet receiving part, side plate, and main board that are fixed to each other. As shown in Figure 9, the side plate 101 has side plate side welding parts 115 and 116 that are ultrasonically welded to the magnet receiving part 100, and the main board 102 has a main board side welding part 117 that is ultrasonically welded to the side plate 101.

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

[0048] More specifically, the operator uses ultrasound to vibrate the side-plate side-welded portions 115 and 116 of the side plate 101, melting these portions 115 and 116 with frictional heat, and then fixes them to the magnet receiving portion 100 in this state. The welded portion 115 is disposed on the outer side of the permanent magnet 5 and the yoke 19 in the radial direction, and the welded portion 116 is disposed on the inner side of the permanent magnet 5 and the yoke 19 in the radial direction. Therefore, the impeller 1 can reliably prevent liquid from entering the magnet receiving portion 100. Because the magnet receiving portion 100 and the side plate 101 of this embodiment have a mutually interlocking structure, liquid intrusion into the magnet receiving portion 100 is even more reliably prevented.

[0049] The motherboard-side fusion-coated portion 117 is disposed on the outer periphery of the motherboard 102 (that is, on the outer side of the flow path 111). With this arrangement, the motherboard-side fusion-coated portion 117 does not obstruct the flow of liquid through the flow paths 110 and 111. The side plate 101 and the motherboard 102 of this embodiment have a mutually interlocking structure.

[0050] The motor pump MP has a structure that houses a permanent magnet 5 and a yoke 19 inside the impeller 1. In this embodiment, the permanent magnet 5 and the yoke 19 can be easily and cost-effectively housed inside the impeller 1 by having the operator assemble a plurality of separate components (i.e., magnet housing 100, side plate 101, and main plate 102).

[0051] Furthermore, in this embodiment, even if the components of the impeller 1 (i.e., the magnet housing 100, side plate 101, and main plate 102) are made of resin such as PPS, these components can still be easily and cost-effectively fixed. Moreover, by providing side plate side welding portions 115 and 116 on the side plate 101 and main plate side welding portion 117 on the main plate 102, liquid intrusion into the permanent magnet 5 and yoke 19 is prevented, and the flow of liquid is not obstructed, thus enabling stable operation of the motor pump MP.

[0052] In order to meet the expected requirements (e.g., stable operation of the motor pump MP), the motor pump MP has a bearing 10 with a characteristic structure. Hereinafter, the structure of the bearing 10 will be described with reference to the drawings.

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

[0054] A portion of the liquid ejected from the impeller 1 is guided into the bearing 10 through a small gap between the impeller 1 and the motor housing 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 by the bearing 10 in a non-contact manner. The fixed side bearing 12 supports the rotating side bearing 11 by means of the orthogonal radial surface 12a and the thrust surface 12b, thus restricting the tilting movement of the impeller 1 by means of the bearing 10.

[0055] Because the permanent magnet 5 is housed within the impeller 1, a magnetic force exists between the permanent magnet 5 and the motor stator 6. More specifically, the side 11b of the rotating side bearing 11 fixed to the impeller 1 moves towards the thrust surface 12b of the fixed side bearing 12 by means of this magnetic force. Therefore, when the motor pump MP starts, the rotating side bearing 11 and the fixed side bearing 12 slide forcefully. This results in wear on the bearing 10, potentially shortening its lifespan.

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

[0057] When this embodiment is adopted, the contact area between the side surface 11b of the rotating bearing housing 11 and the thrust surface 12b of the fixed bearing housing 12 can be reduced. As a result, when the motor pump MP starts, the frictional force caused by the rotation of the impeller 1 on the bearing 10 can be suppressed. As a result, the bearing 10 can be extended in life and the motor pump MP can be operated stably.

[0058] Figure 11 shows a helical groove formed on the side surface of the rotating bearing housing. As shown in Figure 11, the bearing 10 may also have a plurality of helical grooves 118 formed on the side surface 11b of the rotating bearing housing 11. The plurality of helical grooves 118 are formed in a helical extension to generate dynamic pressure through a wedge effect. The embodiment shown in Figure 11 has the helical grooves 118 formed on the side surface 11b of the rotating bearing housing 11, but the helical grooves 118 may also be formed on the inner circumferential surface 11a of the rotating bearing housing 11. In one embodiment, the helical grooves 118 may also be formed on at least one surface of the fixed bearing housing 12, namely the radial surface 12a and the thrust surface 12b.

[0059] To meet desired requirements (e.g., cost reduction of the motor pump MP), the motor pump MP has a motor stator 6 with a characteristic structure. The structure of the motor stator 6 will be described below with reference to the drawings.

[0060] Figure 12 is a view of the stator center of the motor stator from the axial direction. Figure 13 is a cross-sectional view along line AA of Figure 12. As shown in Figures 12 and 13, the stator center 6A of the motor stator 6 includes: a plurality of teeth 6A-1; and a yoke 6A-2 having an integral structure with the plurality of teeth 6A-1. The yoke 6A-2 has an annular shape, and the teeth 6A-1 extend from the yoke 6A-2 in the axial direction CL and are arranged at equal intervals along the circumferential direction of the yoke 6A-2.

[0061] The stator core 6A is a powder-pressed iron core integrally formed by the tooth section 6A-1 and the yoke section 6A-2. In this embodiment, the manufacturing cost of the stator core 6A can be reduced by using a powder-pressed iron core. Generally, manufacturing a stator core requires a process of laminating silicon steel sheets and cutting the teeth from the laminated silicon steel sheets (cutting process). However, this process is complex. In this embodiment, the stator core 6A is manufactured using powder metallurgy as the powder-pressed iron core. Therefore, the cutting process can be omitted, thereby reducing the manufacturing cost of the stator core 6A.

[0062] Figure 13 shows the insulating coating covering the contact portion of the stator core that contacts the stator coil. As shown in Figure 13, the motor stator 6 has an insulating coating 120 covering the contact portion 121 of the stator core 6A that contacts the stator coil 6B. The contact portion 121 is the entire tooth portion 6A-1 and a portion of the yoke portion 6A-2, and the insulating coating 120 covers the contact portion 121. With this configuration, the insulating coating 120 ensures insulation between the stator core 6A and the stator coil 6B.

[0063] Generally, it is necessary to cover the contact portion 121 of the tooth 6A-1 with insulating paper or apply an insulating coating. However, in this embodiment, because the tooth 6A-1 has a structure that protrudes from the yoke 6A-2, covering the entire contact portion 121 of the tooth 6A-1 with insulating paper is cumbersome. Furthermore, applying an insulating coating requires a drying process. In this embodiment, the insulating coating 120 is a thin film made of resin, and because a drying process is not required, the manufacturing cost of the motor pump MP can be reduced.

[0064] Figure 14 is an enlarged view of the tooth portion. As shown in Figure 14, the tooth portion 6A-1 has an inner portion 130 disposed on the inner periphery of the stator core 6A; and an outer portion 131 disposed on the outer periphery of the stator core 6A. The thickness of the insulating coating portion 120 covering the outer portion 131 is greater 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 broad portions 131a, 131a that widen from the inner periphery of the stator core 6A toward the outer periphery. The insulating coating portion 120 has a thick portion 120a covering the broad portions 131a, 131a.

[0065] The thickness of the thick portion 120a covering the insulating coating portion 120 of the wide portion 131a is greater than the thickness of the insulating coating portion 120 covering other parts 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] Increasing the curvature of the wide portion 131a may result in gaps in the wide portion 131a. This is particularly true when the stator core 6A is constructed with a powder-coated iron core, increasing the likelihood of gaps in the wide portion 131a. Consequently, the manufacturing cost of the motor pump MP increases, making it impossible to achieve cost reduction for the motor pump MP. Conversely, reducing the curvature of the thick portion 120a may impair the flowability of the resin constituting the insulating coating portion 120 to the tooth portion 6A-1 during the coating process. In this case, the stator core 6A cannot ensure insulation between itself and the stator coil 6B, further increasing the manufacturing cost of the motor pump MP.

[0067] In this embodiment, the motor stator 6 has a wide portion 131a with a first curvature and a thick portion 120a with a second curvature greater than the first curvature. Therefore, the manufacturing cost of the motor stator 6 can be reduced, resulting in lower cost for the motor pump MP.

[0068] To reduce the manufacturing cost of the motor stator 6, the inner side portion 130 of the tooth 6A-1 has a flat surface 130a that extends linearly in the axial direction CL. The flat surface 130a extends linearly along the axial direction CL (see Figure 14).

[0069] Figure 15 shows the stator coil. As shown in Figure 15, the stator coil 6B is manufactured by winding wire (wound) 135 in multiple layers on the teeth 6A-1 of the stator core 6A in a manner that creates no gap between the teeth 6A-1 and the stator coil 6B. The wire 135 in Figure 15 during unwinding is the unwound wire 135A, and the wire 135 after winding is the wound wire 135B. The unwound wire 135A and the wound wire 135B are respectively connected to the substrate 50.

[0070] For example, when the inner portion 130 has an arcuate surface that is recessed towards the outer portion 131, a process is required to form the surface of the stator coil 6B corresponding to the arcuate surface of the inner portion 130 into an arc shape (arc forming process). However, by adding this process, the manufacturing cost of the motor stator 6 cannot be reduced, and thus the cost reduction of the motor pump MP cannot be achieved. Therefore, by forming a flat surface 130a in the inner portion 130 of the tooth 6A-1, the arc forming process is not required, and the manufacturing cost of the motor stator 6 can be reduced.

[0071] Figure 16 shows another embodiment of the stator core. As shown in Figure 16, the stator core 6A has a receiving step 140 formed between the tooth portion 6A-1 and the yoke portion 6A-2. Unwound wire 135A is disposed in the receiving step 140. The receiving step 140 of the embodiment shown in Figure 16 has an annular shape and a size that can accommodate the unwound wire 135A. In one embodiment, the receiving step 140 does not necessarily need to have an annular shape, as long as it can accommodate the unwound wire 135A. The number of receiving steps 140 can also correspond to the number of unwound wires 135A of the stator coil 6B.

[0072] By forming this receiving step 140, even when the motor stator 6 is installed on the motor housing 3, the unwound wire 135A can be prevented from breaking due to its tight fit with the yoke 6A-2. As a result, stable operation of the motor pump MP can be achieved.

[0073] The above-described embodiments of the motor pump MP have a plurality of desired features. These plurality of features can also be appropriately combined, and the motor pump MP may also have only one of these plurality of features. In one embodiment, the motor pump MP may also have a base plate 50 disposed in the receiving space SP as one of the above-described features. In another embodiment, the motor pump MP may also have an impeller 1 composed of a plurality of constituent parts as one of the above-described features. In another embodiment, the motor pump MP may also have a bearing 10 having an inclined thrust surface 12b as one of the above-described features. In another embodiment, the motor pump MP may also have a stator core 6A composed of a powder-pressed iron core as one of the above-described features. In another embodiment, the motor pump MP may also have a motor stator 6 having an insulating coating portion as one of the above-described features. In yet another embodiment, the motor pump MP may also have a tooth portion 6A-1 having a flat surface 130a as one of the above-described features.

[0074] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments, and can of course be implemented in various different forms within the scope of its technical concept. [Industrial Applicability]

[0075] This invention can be used in motor pumps.

[0076] 1: Impeller 2: Pump casing 3: Motor housing 5: Permanent magnets 6: Motor stator 6A: Stator Center 6A-1: Tooth 6A-2: Yoke 6B: Stator coil 9: Sealing components 10: Bearings 11: Rotating side bearing body 11a: Inner circumferential surface 11b: Side view 12: Fixed side bearing body 12a: Radial surface 12b: Thrust surface 15: Inhalation port 15a: Inlet 16: Outbound Port 16a: Exhale 19: Magnetic yoke 20: Heat dissipation components 20a:Inner surface 20b: outside 35: Heat transfer ring 40: Wire 50:Substrate 51: Weld ring section 55: Grouting material 100: Magnet Storage Section 100a: Open end 101: Side panel 101a: Inner circumferential surface 101b: Outer peripheral surface 102: Motherboard 105: Annular concave portion 110,111: Flow path 115, 116: Side plate side welded section 117: Motherboard side welded section 118: Spiral Groove 120: Insulation Coating Section 120a: Thick part 121: Contact area 130: Inner side area 130a: Flat surface 131: Outer side 131a: Broad section 135: Wire 135A: Uncoiled Wire 135B: Finished winding of wire 140: Containment Rank CL: Axis LC: liquid flow path MP: Motor pump SP: Containment Space SPa: Gap

Claims

1. A motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor stator having a plurality of stator coils; a motor housing housing the motor stator; a heat dissipation member enclosing a housing space formed within the motor housing; a base plate connected to the plurality of stator coils and disposed within the housing space; and a heat transfer ring mounted on the base plate and disposed between the heat dissipation member and the motor stator.

2. A motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor stator having a plurality of stator coils; a motor housing housing the motor stator; a heat dissipation member enclosing a housing space formed within the motor housing; and a substrate connected to the plurality of stator coils and disposed within the housing space, wherein the substrate is disposed radially outside a suction port connected to a liquid flow path formed in the motor housing.

3. A motor pump comprising: an impeller housing a permanent magnet; a pump housing housing the impeller; a motor stator having a plurality of stator coils; a motor housing housing the motor stator; a heat dissipation member enclosing a housing space formed within the motor housing; and a substrate connected to the plurality of stator coils and disposed in the housing space, wherein the substrate is covered with a potting material filling the housing space.

4. The motor pump of claim 3, wherein the aforementioned potting material forms a gap adjacent to the aforementioned heat dissipation member and fills the aforementioned receiving space.

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