Canned pump and cooling device including the same

Abstract

To provide a canned pump which can be formed in a lower back shape to sufficiently cool a coil by devising the shape of each of a coil cover and a bobbin case while reducing the size with high reliability, and to provide a cooling device including the same.SOLUTION: The canned pump includes a rotor unit 10 and a stator unit 50 detachable in an axis L direction, and axial-direction positioning means. A coil cover 80 covers at least part of one lateral face of a coil 63, and the axial-direction positioning means has a bobbin case 62 of which one lateral face has body case abutment parts 62a1a, 62a2a abutting directly on a body case 30 in the axis L direction. The body case abutment parts 62a1a, 62a2a are provided on the same plane with or on one side of one lateral face of the coil cover 80 adjacent to the body case abutment parts 62a1a, 62a2a in view from a direction perpendicular to the axis L.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a canned pump having a coil cover and a cooling device including the same.

Background Art

[0002] In Patent Document 1, as shown in FIG. 12, there is described a canned pump 1200 (hereinafter referred to as “conventional canned pump”) including an impeller member 1221 having a rotor magnet 1222 rotatable around an axis L, a rotor unit 1210 accommodated in a main body case 1230, and a stator unit 1250 in which a coil 1263 is wound around a bobbin case 1262 covering a part of a stator core 1261, and the rotor unit 1210 and the stator unit 1250 are detachable from each other.

[0003] In the conventional canned pump 1200, in a state where the rotor unit 1210 is removed from the stator unit 1250, a coil cover 1280 and a coil case 1290 are fixed to one side (upper side in the figure) and the other side (lower side in the figure) of the bobbin case 1262 so as to cover the coil 1263 in order to prevent physical contact with the coil 1263 and adhesion of foreign matters such as dust.

[0004] Here, in the conventional canned pump 1200, when attaching the rotor unit 1210 to the stator unit 1250, first, as axial positioning means, the rotor magnet accommodating portion 1232c of the main body case 1230 is brought into contact with the other end portion 1262a (refer to the lattice pattern in the figure) of the bobbin case 1262 having an L-shaped cross section. Then, the rotor unit 1210 is rotated around the axis L with respect to the stator unit 1250, and the blade accommodating portion 1232b of the main body case 1230 is connected to the coil cover 1280 via the connecting means 1205.

[0005] Therefore, in the conventional canned pump 1200, since the coil cover 1280 and the connecting means 1205 are interposed between the blade accommodating portion 1232b of the main body case 1230 and the bobbin case 1262, there is a possibility that the canned pump 1200 cannot be made thinner (hereinafter referred to as "conventional problem 1 (difficulty in making the canned pump thinner)").

[0006] Further, in the conventional canned pump 1200, in order to prevent insulation deterioration or burning of the bobbin case 1262 due to heat generation of the coil 1263, the inner peripheral side of the bobbin case 1262 is disposed opposite to the rotor magnet accommodating portion 1232c, and the coil 1263 is cooled by the working fluid in the main body case 1230.

[0007] Here, in the conventional canned pump 1200, since the working fluid always flows in the main body case 1230 that constitutes the blade accommodating portion 1232b, the cooling effect by the blade accommodating portion 1232b becomes higher. On the other hand, in the main body case 1230 that constitutes the rotor magnet accommodating portion 1232c, since the working fluid stays in an extremely narrow gap, the cooling effect by the rotor magnet accommodating portion 1232c is low.

[0008] Therefore, in the conventional canned pump 1200, since the inner peripheral surface of the bobbin case 1262 is disposed opposite to the rotor magnet accommodating portion 1232c where the cooling effect is relatively low, there is a possibility that the cooling of the coil 1263 becomes insufficient. On the other hand, it is also conceivable that one side surface of the bobbin case 1262 is cooled by the blade accommodating portion 1232b where the cooling effect is relatively high. However, in the conventional canned pump 1200, since the coil cover 1280 and the connecting means 1205 are interposed between one side surface of the bobbin case 1262 and the blade accommodating portion 1232b where the cooling effect is relatively high, it has been physically difficult to cool the coil 1263 by the blade accommodating portion 1232b (hereinafter referred to as "conventional problem 2 (insufficient coil cooling)").

Prior Art Documents

Patent Documents

[0009] Patent Document 1 Japanese Patent Application Laid-Open No. 2017-125488 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] An object of the present invention is to provide a canned pump that can be sufficiently reduced in height and the coil can be sufficiently cooled by devising the shapes of the coil cover and the bobbin case, and a canned pump that is miniaturized and highly reliable, and a cooling device including the same. MEANS FOR SOLVING THE PROBLEMS

[0011] To solve the above problems, a canned pump includes a rotor unit having a rotor magnet provided on an impeller member, a rotor that rotates about an axis, and a main body case that houses the rotor, and a stator in which a coil is wound around a stator core via a bobbin case, and a stator unit having a coil cover that is detachably disposed on one side of the coil and protects the coil. In the rotor unit and the stator unit that are detachably attached in the axial direction, axial positioning means for axially positioning the rotor unit and the stator unit so that the rotor magnet is disposed inside the stator in the radial direction. The coil cover covers at least a part of one side surface of the coil, and the axial positioning means has a main body case contact portion where one side surface of the bobbin case directly contacts the main body case in the axial direction. The main body case contact portion is provided on the same surface or on one side with respect to one side surface of the coil cover adjacent to the main body case contact portion when viewed from a direction orthogonal to the axis.

[0012] Also, in the above-described canned pump, the bobbin case has a first wall portion that forms a main body insertion hole into which the main body case is inserted, a second wall portion that surrounds the coil from the outer peripheral side, and a body portion that connects the first wall portion and the second wall portion and around which the coil is wound. The main body case abutting portion may be configured by the first wall portion.

[0013] Also, in the above-described canned pump, the bobbin case has a first wall portion that forms a main body insertion hole into which the main body case is inserted, a second wall portion that surrounds the coil from the outer peripheral side, and a body portion that connects the first wall portion and the second wall portion and around which the coil is wound. The main body case abutting portion may be configured by the second wall portion.

[0014] Also, in the above-described canned pump, the bobbin case has a first wall portion that forms a main body insertion hole into which the main body case is inserted, a second wall portion that surrounds the coil from the outer peripheral side, and a body portion that connects the first wall portion and the second wall portion and around which the coil is wound. The main body case abutting portion may be configured by the first wall portion and the second wall portion.

[0015] Also, in the above-described canned pump, the coil cover has a covering portion that covers at least a part of one side surface of the coil, a mounting portion that is provided on the outer side in the radial direction of the covering portion and is mounted on the stator, and a plurality of connecting portions that connect the covering portion and the mounting portion. The main body case abutting portion may be inserted into a covering portion outer peripheral opening defined at least by the covering portion and a pair of adjacent connecting portions.

[0016] Also, in the above-described canned pump, the connecting portion may extend from the outer peripheral edge of the covering portion to the other side, and the mounting portion may extend radially outward from the other end of the connecting portion.

[0017] Also, in the above-described canned pump, the coil cover has a covering portion that covers at least a part of one side surface of the coil, a mounting portion that is provided on the outer side in the radial direction of the covering portion and is mounted on the stator, and a plurality of connecting portions that connect the covering portion and the mounting portion. The main body case contact portion of the second wall portion is provided with a plurality of discontinuously arranged portions along the circumferential direction via slits, and the slits are formed at positions where the body portion is not arranged on the inner side in the radial direction of the slits. The connecting portion may be inserted into the slits.

[0018] Also, in the above-described canned pump, the stator unit is arranged on the other side of the coil and further includes a coil case that protects the coil. A main body insertion hole is formed in the other side portion of the coil case. When the other end portion of the main body case is inserted into the main body insertion hole, the other end portion of the main body case may not protrude outside the other side portion of the coil case.

[0019] Also, in the above-described canned pump, the stator unit further includes a substrate that controls a drive signal to the coil and a coil case that is arranged on the other side of the coil and protects the coil. One side surface of the substrate abuts on the stator, and a connector for a power supply terminal to the substrate is connected to the other side surface of the substrate. A connector insertion hole is formed in the other side portion of the coil case. When the connector is inserted into the connector insertion hole, the other end portion of the connector may not protrude outside the other side portion of the coil case.

[0020] Also, it may be a cooling device including the above-described canned pump.

Advantages of the Invention

[0021] According to the present invention, by devising the shapes of the coil cover and the bobbin case respectively, it is possible to provide a canned pump capable of sufficiently reducing the height of the canned pump and cooling the coil, and a cooling device including the same.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0023] Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 11. However, the present invention is not limited to the aspects of this embodiment. In the following canned pump, a centrifugal impeller is adopted for description, but the type of this impeller is only an example, and other types of impellers, such as a cascade type impeller, can be adopted.

[0024] <Regarding terms> In the description of this specification and the claims, "left", "right", "up", and "down" indicate the directions shown in FIGS. 1 to 2, 7(b), 9, 10(a), and 11. In the description of this specification and the claims, "one end" and "the other end" indicate "the upper end" and "the lower end" in the drawing. In the description of this specification and the claims, "one side" and "the other side" indicate "the upper side" and "the lower side" in the drawing. In the description of this specification and the claims, the "outer peripheral opening of the covering portion" refers to "at least defined by the covering portion and a pair of connecting portions adjacent in the circumferential direction", that is, "defined by the covering portion, a pair of connecting portions adjacent in the circumferential direction, and the mounting portion" (see 80d in FIG. 6(a)) and "defined by the covering portion and a pair of connecting portions adjacent in the circumferential direction" (see 80d' in FIG. 6(b)). In the description of this specification and the claims, the "main body case abutting portion" is not limited to the first wall portion and the second wall portion in the bobbin case, and may be, for example, a protruding portion provided on the outer peripheral side in the radial direction of the second wall portion and extending in one side in the axial direction.

[0025] (This embodiment) <Regarding the configuration of the canned pump> The canned pump 100 according to this embodiment will be described with reference to FIGS. 1 to 7. As shown in FIG. 10, the canned pump 100 mainly includes a rotor unit 10, a stator unit 50, and a bracket 5. Here, the rotor unit 10 and the stator unit 50 are detachable in the direction of the axis L. Hereinafter, each configuration of the canned pump 100 will be described in order.

[0026] <Regarding the rotor unit> First, as shown in FIGS. 1 to 5, the rotor unit 10 is mainly composed of a rotor 20, a main body case 30, a shaft fixing member 41, a fixing shaft 42, and a blade case 43. Hereinafter, each component of the rotor unit 10 will be described in order.

[0027] Here, although details will be described later, in this embodiment, as shown in FIGS. 1 and 2, on the premise that a detachable coil cover 80 is arranged on one side of the coil 63, one side surface (main body case contact portions 62a1a, 62a2a) of the bobbin case 62 which is the axial positioning means is directly brought into contact with the main body case 30 in the axial direction of the axis L, thereby simultaneously solving the conventional problem 1 (difficulty in reducing the height of the canned pump) and the conventional problem 2 (insufficient coil cooling), and it is possible to improve the reliability while saving space.

[0028] <Regarding the rotor> As shown in FIG. 1, the rotor 20 includes an impeller member 21 and a rotor magnet 22.

[0029] The impeller member 21 includes a tubular bearing portion 21a, a base end portion 21b that constitutes the other side of the bearing portion 21a, a diameter-expanded portion 21c that constitutes the center of the bearing portion 21a and extends in the outer peripheral direction from the base end portion 21b, a suction blade portion 21d that constitutes one side of the bearing portion 21a and extends in one side direction, and an outer blade portion 21e that is continuously extended in the outer peripheral direction from the suction blade portion 21d.

[0030] Note that the number of impeller members 21 in this embodiment is eight, but it is not limited to this, and it can be selected according to the use of the canned pump 100 and the required pump capacity.

[0031] The rotor magnet 22 is formed of an annular permanent magnet and is fixed to the other side surface of the enlarged diameter portion 21c and the outer peripheral surface of the base end portion 21b of the impeller member 21 via a retaining member 7 (for example, a C-ring or the like). Thereby, the impeller member 21 is configured to be rotatable around the axis L together with the rotor magnet 22.

[0032] <Regarding the main body case> As shown in FIG. 1, the main body case 30 houses the rotor 20 and includes a first main body case 31 and a second main body case 32.

[0033] This first main body case 31 has a circular shape when viewed in the direction of the axis L, and includes a top wall 31a and a side peripheral wall 31b having a cylindrical shape extending to the other side from the outer peripheral edge of the top wall 31a. On the side peripheral wall 31b of the first main body case 31, there are formed a first opening 31c (see FIG. 2) and another opening (not shown) at a position 270° counterclockwise from the first opening 31c when viewed in the direction of the axis L (see FIG. 3). A suction side joint member 1 and a discharge side joint member 2 are fixed to the first opening 31c and the other opening, respectively, in a sealed state. Further, the first main body case 31 is formed with a raised portion 31e (see FIG. 3) that bulges to one side along the radial direction from the fixed position of the suction side joint member 1 to the center position of the axis L when viewed in the direction of the axis L.

[0034] The second main body case 32 has a circular shape when viewed in the direction of the axis L, and includes an outer peripheral flange 32a vertically provided on the other side, an impeller housing portion 32b horizontally extending inward from one end side of the outer peripheral flange 32a, a cylindrical rotor magnet housing portion 32c provided on the other inner peripheral side of the impeller housing portion 32b, and a bottomed cylindrical shaft fixing member housing portion 32d provided on the other inner peripheral side of the rotor magnet housing portion 32c.

[0035] Here, the outer peripheral flange 32a of the other-side main body case 32 is fixedly attached in a sealed state to the inner wall 31d at the other end of the side peripheral wall 31b of the one-side main body case 31. As a result, an internal space surrounded by the one-side main body case 31 and the other-side main body case 32 and in fluid communication with the suction-side joint member 1 and the discharge-side joint member 2 is formed within the main body case 30.

[0036] <Regarding the shaft fixing member and the fixed shaft> The shaft fixing member 41 is fitted into the shaft fixing member housing portion 32d, for example, by press-fitting. The shaft fixing member 41 has a shaft hole 41a centered on the axis L, and the lower end portion of the fixed shaft 42 is fixed to the shaft hole 41a, for example, by press-fitting. The bearing portion 21a of the impeller member 21 is rotatably inserted into the cantilever-supported fixed shaft 42 via a thrust washer 6 that reduces dynamic friction.

[0037] <Regarding the blade case> The blade case 43 has a circular shape when viewed in the direction of the axis L. The blade case 43 has an opening 43aa centered on the axis L, and has a one-side surface 43a whose outer diameter gradually increases along the circumferential flow from the attachment position of the suction-side joint member 1 to the attachment position of the discharge-side joint member 2, a leg portion 43b provided on the outer peripheral side of the one-side surface 43a, and a side peripheral wall 43c connected to the outer peripheral edge of the one-side surface 43a and the inner peripheral edge of the leg portion 43b, respectively. Note that the outer diameter of the side peripheral wall 43c of the blade case 43 is formed smaller than the inner diameter of the side peripheral wall 31b of the one-side main body case 31, and the height of the side peripheral wall 43c of the blade case 43 is formed smaller than the height of the side peripheral wall 31b of the one-side main body case 31.

[0038] The leg portion 43b of the impeller case 43 is fixed in a sealed state to the side peripheral wall 31b of the one-side main body case 31 in a state of abutting against one side surface of the other-side main body case 32 on the suction-side joint member 1 side as shown in FIG. 2. Although not shown, the side peripheral wall 43c of the impeller case 43 has an opening (not shown) at a position corresponding to the shape of the side peripheral wall 31b of the one-side main body case 31, that is, at a position corresponding to the other opening of the one-side main body case 31 on the discharge-side joint member 2 side. With the side peripheral wall 43c of the impeller case 43 abutting against the side peripheral wall 31b of the one-side main body case 31, it is fixed in a sealed state together with the discharge-side joint member 2 through the opening.

[0039] As shown in FIGS. 1 and 2, this impeller case 43 forms a fluid path between the one-side main body case 31 and houses the suction impeller portion 21d and the outer impeller portion 21e between the impeller housing portion 32b of the other-side main body case 32. This fluid path has a radial fluid path S1 formed between the raised portion 31e of the one-side main body case 31 and the impeller case 43, and an impeller housing space S2 communicating with the radial fluid path S1 through the opening 43aa of the impeller case 43. The radial fluid path S1 and the impeller housing space S2 are each in fluid communication with the suction-side joint member 1 and the discharge-side joint member 2.

[0040] <Regarding the fluid path of the cooling device equipped with a canned pump> Although not shown, regarding the fluid path of the cooling device equipped with the canned pump 100, it is connected in the order of the canned pump 100, the heat exchanger to which the object to be cooled is attached, and the radiator (for example, air cooling by a fan, water cooling, etc.) through the cooling circulation path, and is configured as a closed circuit that is circulated back to the canned pump 100 again. Therefore, the object to be cooled is cooled by the working fluid (for example, water, etc.) circulated between the heat exchanger and the radiator via the canned pump 100. In this cooling device equipped with the canned pump 100, since the cooling of heat-generating components, devices, etc. is performed by utilizing the circulation of the fluid, it has excellent durability, operability, and quietness.

[0041] Next, with reference to FIGS. 1 and 2, the fluid path in the operating state of the canned pump 100 will be described. First, by passing an electric current through the coil 63 of the stator unit 50, the coil 63 is excited. The excitation of this coil 63 acts on the rotor magnet 22, causing the impeller member 21 fixed to the rotor magnet 22 to rotate around the fixed shaft 42 inserted through the shaft fixing member 41.

[0042] As shown in FIG. 2, the rotation of the impeller member 21 causes the suction impeller part 21d to generate a negative pressure near the opening 43aa of the impeller case 43. Due to this negative pressure, the working fluid is drawn from the suction side joint member 1 fluidly connected to the radiator through the radial fluid path S1 defined by the impeller case 43 and the raised portion 31e (see FIG. 3) of the one-side main body case 31 to the opening 43aa of the impeller case 43.

[0043] Then, the fluid sucked into the opening 43aa of the impeller case 43 moves in a spiral manner along the outer radius of the impeller housing space S2 and the inner circumference of the side wall 43c of the impeller case 43 due to the centrifugal force of the outer impeller part 21e, and is finally discharged to the heat exchanger through the discharge side joint member 2.

[0044] <Regarding the stator unit> Returning now to the description of the stator unit 50 in the present embodiment with reference to FIGS. 1 and 2. As shown in FIG. 1, the stator unit 50 includes a stator 60, a substrate 70, a coil cover 80, and a coil case 90.

[0045] <Regarding the stator> As shown in FIGS. 4 and 5, the stator 60 includes a stator core 61 formed by laminating thin magnetic plates made of a magnetic material, a bobbin case 62 made of an insulating material such as resin and covering a part of the stator core 61, and a plurality of coils 63 wound around the stator core 61 via the bobbin case 62. The bobbin case 62 has a rectangular outer shape, support portions 62b provided at each corner, notch portions 62ba provided in the support portions 62b through which the fastening member 8 is inserted, and a plurality of terminal pins 64 (see FIG. 5) disposed on the inner peripheral side of the support portions 62b to which the ends of the coils 63 are electrically connected.

[0046] <Regarding the substrate> As shown in FIGS. 4 and 5, the substrate 70 has a substantially rectangular shape and controls a drive signal to the coil 63. The substrate 70 has an opening 70a centered on the axis L, notch portions 70b provided at each corner as viewed in the direction of the axis L through which the fastening member 8 is inserted, and a plurality of pin holes 70h disposed on the inner peripheral side of the notch portions 70b. Further, as shown in FIG. 5, a connector 70c having a cable 70d for a power supply terminal to the substrate 70 is connected to the other side surface of the substrate 70.

[0047] <Regarding the coil cover> As shown in FIG. 4, the coil cover 80 covers at least a part of one side surface of the coil 63 in order to prevent physical contact with the coil 63 and the attachment of foreign matters such as dust, and is made of a resin material. In this way, by making the coil cover 80 detachable from one side of the coil 63, the cost can be reduced as compared with resin molding one side of the coil 63.

[0048] <Regarding the coil case> As shown in FIG. 5, the coil case 90 covers the other side surface of the coil 63 to prevent physical contact with the coil 63 and the attachment of foreign matters such as dust, and is made of a resin material. This coil case 90 has a substantially rectangular shape, and includes a coil case bottom 90a (the other side portion of the coil case) in which an opening 90aa and a connector insertion hole 90ab centered on the axis L are formed, a coil case side portion 90b erected from the peripheral edge of the coil case bottom 90a, a bobbin case receiving portion 90c provided at each corner of the coil case bottom 90a, and a fastening hole 90ca formed in the bobbin case receiving portion 90c and screwed with the screw portion 8a (see FIG. 10) of the fastening member 8. Further, as shown in FIG. 4, the coil case side portion 90b of the coil case 90 has a cable notch portion 90ba through which the cable 70d (see FIG. 2) can be inserted between the coil cover 80 and the hanging wall 80f (see FIG. 5) of the coil cover 80. In the present embodiment, the coil case 90 is adopted, but this coil case 90 is not an essential configuration. For example, the other side of the stator 60 may be resin-molded and a configuration corresponding to the bobbin case receiving portion 90c and the fastening hole 90ca of the present embodiment may be provided.

[0049] <Regarding the bracket> As shown in FIG. 4, the bracket 5 has a substantially rectangular outer shape, and includes a top plate 5b having a U-shaped recess 5a corresponding to the shape of the raised portion 31e of the one-side main body case 31 when viewed in the axis L direction, overhang portions 5c protruding from each corner of the top plate 5b toward the other side and the radially outer side, and a fastening hole 5ca formed in the overhang portion 5c and through which the fastening member 8 is inserted.

[0050] Although details will be described later, in the present embodiment, the bracket 5 and the fastening member 8 are adopted as means for fixing the rotor unit 10 and the stator unit 50 to each other in the axis L direction and the circumferential direction. However, the present invention is not limited thereto, and for example, four L-shaped clips and fastening members, or other locking members may be adopted.

[0051] <Regarding the detailed structure of the coil cover> As shown in Fig. 6(a), the coil cover 80 has a substantially rectangular shape and includes a covering portion 80a having an opening 80aa centered on the axis L, a mounting portion 80b provided on the outer side in the radial direction of the covering portion 80a, a plurality of connecting portions 80c connecting the covering portion 80a and the mounting portion 80b, and fastening holes 80e provided at each corner portion through which the fastening member 8 is inserted. The plurality of connecting portions 80c extend from the outer peripheral edge of the covering portion 80a to the other side, and the mounting portion 80b extends radially outward from the other end of the connecting portion 80c. Thus, as will be described in detail later, as shown in Fig. 1, in the assembled state of the rotor unit 10 and the stator unit 50, the outer peripheral side other end portion of the main body case 30, that is, the other end portions of the side peripheral wall 31b and the outer peripheral flange 32a, are disposed opposite to one side of the mounting portion 80b, so that space can be saved in the direction of the axis L. Further, as shown in Fig. 5, the coil cover 80 has a hanging wall 80f vertically provided from one side of the mounting portion 80b. Here, in the coil cover 80, a covering portion outer peripheral opening 80d is defined by the covering portion 80a, a pair of adjacent connecting portions 80c, and the mounting portion 80b, respectively. As will be described in detail later, in the coil cover 80, as shown in Fig. 8, the first wall portion 62a1 of the bobbin case 62 is inserted into the opening 80aa, and the second wall portion 62a2 of the bobbin case 62 having a corresponding shape is inserted into the covering portion outer peripheral opening 80d.

[0052] (Modified Example of Coil Cover) Here, a modified example of the coil cover of the present embodiment will be described with reference to Fig. 6(b). The modified example of the coil cover is different from the shapes of the connecting portion 80c and the mounting portion 80b of the present embodiment in terms of the shapes of the connecting portion 80c' and the mounting portion 80b', but the other basic configurations are the same as those of the present embodiment. Here, the same reference numerals are given to the same configurations, and redundant descriptions are omitted. Note that Fig. 6(b) corresponds to Fig. 6(a).

[0053] As shown in FIG. 6(b), in the coil cover modification example, the coil cover 80' has a connecting portion 80c', a mounting portion 80b', and a fastening hole 80e provided in the same radial direction when viewed from the direction of the axis L. The covering portion 80a and a pair of adjacent connecting portions 80c' define an outer peripheral opening 80d' of the covering portion. Thus, in the coil cover 80' of the coil cover modification example, cost reduction can be achieved by simplifying the overall shape. Further, in the coil cover 80' of the coil cover modification example, since it is not necessary to match the outer peripheral opening 80d' of the covering portion with the shape of the second wall portion 62a2 of the bobbin case 62, the attachment work between the coil cover 80' and the bobbin case 62 can be smoothly performed.

[0054] Note that in the coil cover 80 of the present embodiment and the coil cover 80' of the coil cover modification example, they each have a covering portion 80a, connecting portions 80c, 80c', mounting portions 80b, 80b', and a fastening hole 80e. However, it is not limited to this. For example, the coil cover may be composed only of a covering portion having a ring shape.

[0055] <Regarding the detailed structure of the stator> From here, the description returns to the detailed structure (stator core 61, bobbin case 62, and coil 63) of the stator 60 in the present embodiment using FIG. 7.

[0056] The stator core 61 is formed by laminating thin magnetic plates made of a magnetic material. When viewed from the direction of the axis L, it includes an outer peripheral ring portion (not shown) formed in an annular shape, and a plurality (for example, nine) of salient pole portions (not shown) that project in a T shape at equal angular pitches in the circumferential direction from the outer peripheral ring portion toward the inner side in the radial direction. The outer peripheral ring portions are arranged on the same circle when viewed from the direction of the axis L.

[0057] As shown in FIG. 7(b), the bobbin case 62 is formed of an insulating material such as resin to ensure insulation between the stator core 61 and the coil 63 when the coil 63 is wound around the stator core 61, and is provided between the stator core 61 and the coil 63. This bobbin case 62 includes a bobbin case body 62a that encloses the stator core 61, and a support portion 62b that is sandwiched between the coil cover 80 and the coil case 90 as shown in FIG. 1.

[0058] Specifically, the bobbin case 62 includes a plurality of first wall portions 62a1 that form a main body insertion hole 62a1h into which the main body case 30 is inserted, a plurality of second wall portions 62a2 that surround the coil 63 from the outer peripheral side, and a plurality of body portions 62ab (see FIG. 7(b)) that connect the first wall portions 62a1 and the second wall portions 62a2 and around which the coil 63 is wound.

[0059] The first wall portions 62a1 are formed corresponding to the tip positions of the respective salient pole portions of the stator core 61 and extend on one side and the other side respectively. Also, as shown in FIG. 7(a), the inner peripheral surface of the first wall portion 62a1 is arranged on the same virtual circle (see the broken line in the figure) that defines the main body insertion hole 62a1h when viewed in the direction of the axis L.

[0060] As shown in FIGS. 4 and 5, the second wall portions 62a2 extend on one side and the other side respectively. Also, as shown in FIG. 7(a), the inner peripheral surface 62a2i of the second wall portion 62a2 is arranged on the same circle when viewed in the direction of the axis L. Here, the second wall portions 62a2 that extend on one side are arranged discontinuously in the circumferential direction (for example, four) via the slit S as shown in FIGS. 4 and 7(a). This slit S is formed at a position where the body portion 62ab is not arranged on the radially inner side of the slit S, and when assembling the stator unit 50, the connecting portion 80c of the coil cover 80 is inserted into the slit S. Note that the second wall portions 62a2 that extend on the other side are arranged evenly in the circumferential direction as shown in FIG. 5.

[0061] In addition, although the second wall portion 62a2 in the present embodiment has been described as being arranged on the same circle when viewed in the direction of the axis L, the present invention is not limited to this. For example, when viewed in the direction of the axis L, the second wall portion 62a2 may be arranged so as to form a side of a polygon.

[0062] As shown in FIG. 7(b), the body portion 62ab is formed so as to surround a connecting portion (not shown) that connects the outer peripheral ring portion of the stator core 61 and the tip positions of the respective salient pole portions when viewed in a direction orthogonal to the axis L. A coil 63 is wound around the body portion 62ab. As a result, a plurality of coils 63 are provided at regular intervals in the circumferential direction. Further, as described above, since no slit S is formed on the outer peripheral side of the body portion 62ab, the outer peripheral edge of the wound coil 63 is surely guided into the inner peripheral surface 62a2i of the second wall portion by the second wall portion 62a2. Thereby, when assembling the stator unit 50, it is possible to prevent the connecting portion 80c of the coil cover 80 inserted into the slit S from contacting the coil 63 and damaging the coil 63.

[0063] As shown in FIG. 7(b), at the other ends of the first wall portion 62a1 and the second wall portion 62a2, a substrate contact portion 62a1b of the first wall portion and a substrate contact portion 62a2b of the second wall portion that directly contact the substrate 70 in the direction of the axis L are formed. The substrate contact portion 62a1b of the first wall portion and the substrate contact portion 62a2b of the second wall portion are on the same plane when viewed in a direction orthogonal to the axis L. In the present embodiment, both of the other ends of the first wall portion 62a1 and the second wall portion 62a2 form the substrate contact portions 62a1b and 62a2b. However, the present invention is not limited to this. For example, as long as at least one of the other ends of the first wall portion 62a1 and the second wall portion 62a2 forms a substrate contact portion.

[0064] <Regarding the assembling process of the stator unit> Using FIGS. 4, 5, 8, and 9, the assembly process of the stator unit 50 will be described. First, regarding the assembly process of the stator 60 and the substrate 70, a plurality of terminal pins 64 (see FIG. 5) of the stator 60 are inserted into a plurality of pin holes 70h of the substrate 70 provided at corresponding positions, and in a state where the substrate contact portions 62a1b of the first wall portion and the substrate contact portions 62a2b of the second wall portion (see FIG. 7(b)) are in contact with the substrate 70, the terminal pins 64 are fixed to the substrate 70 by soldering.

[0065] Next, regarding the process of assembling the stator 60 and the substrate 70 fixed to each other into the coil case 90, as shown in FIG. 5, a connector 70c provided on the other side surface of the substrate 70 is inserted into the connector insertion hole 90ab, and as shown in FIG. 4, support portions 62b provided at the four corners of the bobbin case 62 are placed on the bobbin case receiving portion 90c of the coil case 90.

[0066] Finally, regarding the assembly process of the stator 60 placed on the coil case 90 and the coil cover 80, a plurality of first wall portions 62a1 are respectively inserted into the opening 80aa of the coil cover 80, and the second wall portion 62a2 of the bobbin case 62 is respectively inserted into the outer peripheral opening 80d of the covering portion of the coil cover 80 having a corresponding shape. At this time, the other side surface of the mounting portion 80b of the coil cover 80 is placed on one side surface of the support portion 62b of the bobbin case 62, and the connecting portion 80c of the coil cover 80 is respectively inserted into the slits S of the bobbin case 62 provided at corresponding positions. At the same time, the hanging wall 80f (see FIG. 5) of the bobbin case 62 is engaged with one side of the cable notch portion 90ba (see FIG. 4) of the coil case 90, whereby the cable insertion hole 9 shown in FIG. 2 is formed, and the cable 70d is drawn out to the outside through this cable insertion hole 9.

[0067] <Regarding Conventional Problems 1 and 2 (Difficulty in Lowering the Profile of the Can Pump, Insufficient Coil Cooling)> As described above, in the conventional canned pump 1200 shown in FIG. 12, since the coil cover 1280 and the connecting means 1205 are interposed between the blade accommodating portion 1232b of the main body case 1230 and the bobbin case 1262, it has the conventional problem 1 (difficulty in making the canned pump lower). Further, in the conventional canned pump 1200, since the coil cover 1280 and the connecting means 1205 are interposed between one side surface of the bobbin case 1262 and the blade accommodating portion 1232b having a relatively high cooling effect, it has the conventional problem 2 (insufficient coil cooling).

[0068] On the other hand, in the present embodiment, the stator unit 50 is premised on disposing a detachable coil cover 80 on one side of the coil 63 as shown in FIGS. 8 and 9. When viewed from the direction orthogonal to the axis L, the main body case contact portion 62a1a of the first wall portion (see the dot pattern in the figure) and the main body case contact portion 62a2a of the second wall portion (see the lattice pattern in the figure) are provided on one side with respect to one side surface of the covering portion 80a of the coil cover 80. Thereby, in the assembling process of the rotor unit 10 and the stator unit 50, the main body case contact portions 62a1a and 62a2a, which are one side surfaces of the bobbin case 62, can be directly brought into contact with the main body case 30 in the direction of the axis L, and the conventional problem 1 (difficulty in making the canned pump lower) and the conventional problem 2 (insufficient coil cooling) can be simultaneously solved, and space can be saved and reliability can be improved. Further, in the assembled state of the rotor unit 10 and the stator unit 50, since the main body case contact portion 62a1a of the first wall portion and the main body case contact portion 62a2a of the second wall portion form double concentric circles, the rotor unit 10 can be supported more stably.

[0069] <Regarding the assembling process of the rotor unit and the stator unit> The assembling process of the rotor unit 10 and the stator unit 50 will be described with reference to FIG. 10. First, with the axes L of the rotor unit 10 and the stator unit 50 aligned with each other, the rotor unit 10 is moved closer to the other side of the axis L with respect to the stator unit 50.

[0070] Then, the rotor magnet housing portion 32c of the rotor unit 10 is inserted into the main body insertion hole 62a1h of the stator 60, and the shaft fixing member housing portion 32d of the rotor unit 10 is inserted into the opening 70a of the substrate 70 and the opening 90aa of the coil case 90.

[0071] Furthermore, by directly abutting the blade housing portion 32b of the rotor unit 10 against the main body case abutting portion 62a1a of the first wall portion (refer to the dot pattern in FIGS. 10(a) and 10(b)) and the main body case abutting portion 62a2a of the second wall portion (refer to the lattice pattern in FIGS. 10(a) and 10(b)), which are axial positioning means, the rotor magnet 22 is disposed to face the inner peripheral side of the stator 60. At this time, as shown in FIG. 1, since the other end portion on the outer peripheral side of the main body case 30, that is, the other end portions of the side peripheral wall 31b and the outer peripheral flange 32a, are in a non-contact state with one end surface of the mounting portion 80b, only the main body case abutting portion 62a1a of the first wall portion (refer to the dot pattern in FIG. 1) and the main body case abutting portion 62a2a of the second wall portion (refer to the lattice pattern in FIG. 1) can be directly abutted against the main body case 30. Also, by relatively rotating the rotor unit 10 and the stator unit 50, the suction-side joint member 1, the discharge-side joint member 2, and the pulling-out direction of the cable 70d can be freely selected.

[0072] Finally, by engaging the concave portion 5a of the bracket 5 with the raised portion 31e of the rotor unit 10, the rotation of the rotor unit 10 is stopped, and the threaded portion 8a of the fastening member 8 is screwed into the fastening hole 90ca of the coil case 90 through the fastening hole 5ca of the bracket 5, the fastening hole 80e of the coil cover 80, and the notch portion 62ba of the stator 60, respectively, and fixed in the direction of the axis L. Note that by forming the opening 90aa in the coil case 90, in the assembled state of the rotor unit 10 and the stator unit 50, the shaft fixing member housing portion 32d (the other end portion of the main body case) of the rotor unit 10 can be made shallower to a position where it would originally interfere with the coil case bottom portion 90a.

[0073] As described above, the rotor unit 10 and the stator unit 50 are configured to be detachable from each other in the axial direction of the axis L via the bracket 5 and the fastening member 8.

[0074] <Regarding the axial positioning means> As shown in FIGS. 8 and 9, the axial positioning means in the present embodiment are the main body case contact portions 62a1a of the first wall portion and the main body case contact portions 62a2a of the second wall portion. During the assembly process of the rotor unit 10 and the stator unit 50 described above, the blade accommodating portion 32b of the main body case 30 directly contacts in the axial direction of the axis L with the main body case contact portions 62a1a of the first wall portion (see the dot pattern in the figure) and the main body case contact portions 62a2a of the second wall portion (see the lattice pattern in the figure), which are formed in a plurality along the circumferential direction. As a result, since there is nothing intervening between the blade accommodating portion 32b of the main body case 30 and the bobbin case 62, it is possible to save space in the axial direction of the axis L. Also, since the blade accommodating portion 32b, which has a relatively high cooling effect, directly contacts the bobbin case 62 around which the coil 63 is wound, the conventional problem 1 (difficulty in reducing the height of the can pump) and the conventional problem 2 (insufficient coil cooling) can be solved simultaneously. In addition, in the present embodiment, in the assembled state of the rotor unit 10 and the stator unit 50, each of the main body case contact portions 62a1a, 62a2a serves as a point of action, and since the stator core 61, which has relatively high rigidity, is arranged on the line of the acting force directed from each of the main body case contact portions 62a1a, 62a2a to the other side, the amount of deformation in the axial direction of the axis L also becomes relatively small, and the fastening in the axial direction of the axis L can be performed more firmly.

[0075] <Regarding the concern (difficulty in achieving both coil insulation and height reduction)> In the present embodiment, by directly contacting the main body case contact portions 62a1a of the first wall portion and the main body case contact portions 62a2a of the second wall portion, which are the axial positioning means, with the blade accommodating portion 32b of the main body case 30 in the axial direction of the axis L, space saving in the axial direction of the axis L and improvement of the cooling effect of the coil 63 are simultaneously realized.

[0076] Here, as shown in FIG. 9, the coil 63 and the covering portion 80a are accommodated in the body portion 62ab without protruding from one side of the first wall portion 62a1 and the second wall portion 62a2. At this time, while the gap B required for insulation between the coil 63 and the main body case 30 is desired to be larger than a desired value, there is a concern that if the gap B required for insulation between the coil 63 and the main body case 30 becomes too large, it will be difficult to reduce the height of the can pump 100 itself (hereinafter referred to as "concern (difficulty in achieving both coil insulation and height reduction)").

[0077] On the other hand, in the present embodiment, by designing the one-side extension amount Lex of the main body case contact portions 62a1a and 62a2a so as to satisfy the following (Equation 3), insulation between the coil 63 and the main body case 30 can be surely maintained, and further height reduction of the can pump 100 itself can be achieved.

[0078] Specifically, the gap B required for insulation between the coil 63 and the main body case 30 is desirably set to be larger than the thickness C of the body portion 62ab that has already been subjected to insulation treatment (C < B). Also, in order to prevent the gap B required for insulation between the coil 63 and the main body case 30 from becoming large, it is desirably set to be smaller than the sum of the thickness C of the body portion 62ab and the plate thickness T of the coil cover 80 (B < C + T). Summarizing the above relationships, it can be expressed as the following (Equation 1). C < B < C + T (Equation 1)

[0079] Here, when the thickness A of the wound coil 63 is added to each side of the inequality in (Equation 1), A + C < A + B < A + C + T (Equation 2) is obtained.

[0080] The central side A + B in this (Equation 2) represents the one-side extension amount Lex of the main body case contact portions 62a1a and 62a2a. Therefore, (Equation 2) can be expressed as the following (Equation 3) using the one-side extension amount Lex of the main body case contact portions 62a1a and 62a2a. A + C < Lex < A + C + T (Equation 3)

[0081] By designing the one-side extension amount Lex of the main body case contact portions 62a1a and 62a2a so as to satisfy this (Formula 3), concerns (difficulty in achieving both coil insulation and low profile) can be eliminated.

[0082] Note that the main body case contact portions 62a1a and 62a2a of the present embodiment are provided on one side with respect to one side surface of the covering portion 80a of the coil cover 80. However, the present invention is not limited to this. For example, they may be provided on the same surface with respect to one side surface of the covering portion 80a of the coil cover 80. Thereby, in the assembled state of the rotor unit 10 and the stator unit 50, since the contact area between the blade accommodating portion 32b having a relatively high cooling effect and the stator unit 50 can be increased, the conventional problem 2 (insufficient coil cooling) can be more surely eliminated, and the rotor unit 10 can be supported more stably.

[0083] Also, in the present embodiment, since the coil cover 80 covers a part of one side surface of the coil 63, it allows the circulation of air on one side of the coil 63. Therefore, the air heated by the heat of the coil 63 rises due to the buoyancy effect and can be smoothly radiated to the blade accommodating portion 32b having a relatively high cooling effect. Note that in the present embodiment, the coil cover 80 covers a part of one side surface of the coil 63. However, the present invention is not limited to this. For example, the coil cover 80 may cover the entire one side surface of the coil 63, thereby improving the protective effect of the coil 63.

[0084] (Modification example of the main body case contact portion) Here, with reference to FIG. 11, Modifications 1 to 4 of the main body case contact portion of the present embodiment will be described. First, Modifications 1 and 2 of the main body case contact portion are different from the present embodiment in that only one of the end portions of the first wall portion 62a1 and the end portion of the second wall portion 62a2 serves as the main body case contact portion, but the other basic configurations are the same as those of the present embodiment. Further, Modification 3 of the main body case contact portion is different from the present embodiment in that one end portion of the protruding portion 62a3''' serves as the main body case contact portion, but the other basic configurations are the same as those of the present embodiment. Furthermore, Modification 4 of the main body case contact portion is different from the present embodiment in that the covering portion 80a''' and the mounting portion 80b are formed in a plate shape, but the other basic configurations are the same as those of the present embodiment.

[0085] (Modification 1 of the main body case contact portion) With reference to FIG. 11(a), the end portion of the first wall portion 62a1 and the end portion of the second wall portion 62a2' in Modification 1 of the main body case contact portion of the present embodiment will be described. In this Modification 1 of the main body case contact portion, when viewed from the direction orthogonal to the axis L, the end portion of the first wall portion 62a1 is provided on one side with respect to the end portion of the second wall portion 62a2' and one side surface of the covering portion 80a of the coil cover 80. As a result, in Modification 1 of the main body case contact portion, only the end portion of the first wall portion 62a1 serves as the main body case contact portion 62a1a. Therefore, it is not necessary to process the end portion of the first wall portion 62a1 and the end portion of the second wall portion 62a2 on the same plane as in the present embodiment, and cost reduction of the stator 60' can be achieved.

[0086] (Modification 2 of the main body case contact portion) Using FIG. 11(b), the one end of the first wall portion 62a1'' and the one end of the second wall portion 62a2 in the modification example 2 of the main body case contact portion of the present embodiment will be described. In this modification example 2 of the main body case contact portion, when viewed from the direction orthogonal to the axis L, one end of the second wall portion 62a2 is provided on one side with respect to one end of the first wall portion 62a1'' and one side surface of the covering portion 80a of the coil cover 80. As a result, in the modification example 2 of the main body case contact portion, only one end of the second wall portion 62a2 serves as the main body case contact portion 62a2a. Therefore, similar to the modification example 1 of the main body case contact portion, cost reduction of the stator 60'' can be achieved. Further, the main body case contact portion 62a2a of the modification example 2 of the main body case contact portion is located on the outer peripheral side from the axis L and can increase the contact area compared to the main body case contact portion 62a1a of the modification example 1 of the main body case contact portion. Therefore, the rotor unit 10 can be supported more stably.

[0087] (Modification Example 3 of the Main Body Case Contact Portion) Using FIG. 11(c), the one end of the protruding portion 62a3''' in the modification example 3 of the main body case contact portion of the present embodiment will be described. In this modification example 3 of the main body case contact portion, first, the other end surface of the covering portion 80a''' of the coil cover 80''' is not offset in the direction of the axis L with respect to the other end surface of the mounting portion 80b and is formed on the same plane. Further, when viewed from the direction orthogonal to the axis L, one end of the protruding portion 62a3''' provided on the bobbin case main body 62a (see FIG. 7(b)) is provided on one side with respect to one end of the first wall portion 62a1''', one end of the second wall portion 62a2''', one side surface of the covering portion 80a''' of the coil cover 80''', and one side surface of the mounting portion 80b of the adjacent coil cover 80'''. As a result, the main body case contact portion 62a3a''' of the modification example 3 of the main body case contact portion is located further on the outer peripheral side from the axis L and can further increase the contact area compared to the main body case contact portion 62a2a of the modification example 2 of the main body case contact portion. Therefore, the rotor unit 10 can be supported even more stably.

[0088] (Modification Example 4 of the Main Body Case Contact Portion) Using FIG. 11(d), the one ends of the first wall portion 62a1 and the second wall portion 62a2 in the fourth modification of the main body case contact portion of the present embodiment will be described. In this fourth modification of the main body case contact portion, when viewed from the direction orthogonal to the axis L, the one ends of the first wall portion 62a1 and the second wall portion 62a2 are provided on one side with respect to one side surface of the covering portion 80a of the coil cover 80. Further, in the fourth modification of the main body case contact portion, since the coil cover 80'''' is formed from a plate-like member having the same wall thickness including around the fastening hole 80e, the covering portion 80a''' and the mounting portion 80b, cost reduction of the coil cover 80'''' can be achieved.

[0089] Note that, in the fourth modification of the main body case contact portion of the present embodiment, the one ends of the first wall portion 62a1 and the second wall portion 62a2 respectively become the main body case contact portions 62a1a and 62a2a. However, the present invention is not limited to this. For example, only one of the one ends of the first wall portion 62a1 and the one ends of the second wall portion 62a2 may become the main body case contact portion. Further, in the fourth modification of the main body case contact portion of the present embodiment, when viewed from the direction orthogonal to the axis L, one side surfaces of the covering portion 80a''' and the mounting portion 80b are provided on the same plane. However, the present invention is not limited to this. For example, one side surface of the covering portion 80a''' may be provided on the other side with respect to one side surface of the mounting portion 80b.

[0090] Furthermore, in the present embodiment and the first to fourth modifications of the main body case contact portion, in all cases, one end surface of the bobbin case 62 has been described as becoming the main body case contact portion. However, this main body case contact portion does not need to be one end surface of the bobbin case 62, and any portion that directly contacts the main body case 30 may be used. For example, the main body case contact portion may be provided on the other side with respect to one side surface of the support portion 62b. In addition, in the coil cover 80 of the present embodiment and the first and second modifications of the main body case contact portion, the covering portion 80a is arranged on one side with respect to the mounting portion 80b. Also, in the coil covers 80''' and 80'''' of the third and fourth modifications of the main body case contact portion, the covering portion 80a''' and the mounting portion 80b are provided on the same plane. However, the present invention is not limited to this. For example, the covering portion may be arranged on the other side with respect to the mounting portion.

[0091] <Regarding the concern (the overall height of the stator unit due to the connector being large)> In the present embodiment, as shown in FIG. 2, by directly contacting the main body case contact portions 62a1a of the first wall portion and 62a2a of the second wall portion, which are axial positioning means, with the blade accommodating portion 32b of the main body case 30 in the axial direction L, in particular, the height on one side of the stator unit 50 can be reduced. However, when a connector 70c for power supply terminals to the substrate 70 is provided on the other side of the substrate 70, which is the other side of the stator unit 50, it is necessary to space it apart in the axial direction L so that the connector 70c does not contact the bottom portion 90a of the coil case. Therefore, there was a concern that the overall height h of the stator unit 50 would increase (hereinafter referred to as "the concern (the overall height of the stator unit due to the connector being large)").

[0092] On the other hand, in the present embodiment, a connector insertion hole 90ab is formed in the coil case 90, and by inserting the connector 70c into this connector insertion hole 90ab, the overall height h of the stator unit 50 can be reduced to a position where the connector 70c would originally interfere with the bottom portion 90a of the coil case so as to satisfy the following (Equation 4).

[0093] Specifically, it is desirable to set the overall height h of the stator unit 50 to be smaller than the sum of the height a of the first wall portion 62a1 or the second wall portion 62a2, the thickness b of the substrate 70, the thickness c of the connector 70c, and the thickness d of the bottom portion 90a of the coil case (h < a + b + c + d). Here, in order to avoid the connector 70c interfering with the bottom portion 90a of the coil case, a connector insertion hole 90ab is formed in the coil case 90, and the connector 70c is inserted into this connector insertion hole 90ab. As a result, the overall height h of the stator unit 50 is shortened by the thickness d of the bottom portion 90a of the coil case, that is, it can approach the minimum value represented by the sum of the height a of the first wall portion 62a1 or the second wall portion 62a2, the thickness b of the substrate 70, and the thickness c of the connector 70c (a + b + c < h), and can be expressed as the following (Equation 4). a + b + c < h < a + b + c + d (Equation 4)

[0094] Therefore, the overall height h of the stator unit 50 can satisfy this (Equation 4) by forming the connector insertion holes 90ab in the coil case 90, thus eliminating the concern (the large overall height of the stator unit due to the connector).

[0095] In this embodiment, in order to avoid interference between the connector 70c and the bottom 90a of the coil case, the connector insertion holes 90ab are formed. However, the present invention is not limited to this. For example, instead of the connector insertion holes 90ab, a thin portion may be formed on the bottom 90a of the coil case, or in order to avoid interference between the terminal pins 64 and electronic components mounted on the other side surface of the substrate 70 and the coil case 90, other insertion holes for electronic components may be further formed in the coil case 90.

[0096] Also, as shown in FIG. 2, the overall height h of the stator unit 50 in this embodiment is considered for the case where the connector 70c for the power supply terminal to the substrate 70 is adopted on the other side surface of the substrate 70. When the connector 70c is adopted on one side surface of the substrate 70, since it is necessary to arrange the connector 70c on the outer peripheral side of the stator core 61, the size in the direction orthogonal to the axis L of the stator unit 50 increases, and on the other side surface of the substrate 70, the terminal pins 64 and electronic components (not shown) are still mounted. Therefore, it is difficult to significantly reduce the overall height h of the stator unit 50. For this reason, in this embodiment, the connector 70c is adopted on the other side surface of the substrate 70.

[0097] As described above, in this embodiment, the detachable coil cover 80 is arranged on one side of the coil 63, and one side surface (the main body case contact portions 62a1a, 62a2a) of the bobbin case 62, which is the axial positioning means, is directly brought into contact with the main body case 30 in the direction of the axis L, thereby simultaneously solving the conventional problem 1 (difficulty in reducing the height of the canned pump) and the conventional problem 2 (insufficient coil cooling), and it is possible to save space and improve reliability.

[0098] In this embodiment, the coil cover 80 covers a part of one side surface of the coil 63, and the axial positioning means are the main body case contact portions 62a1a of the first wall portion and 62a2a of the second wall portion. These main body case contact portions 62a1a and 62a2a are provided on one side with respect to one side surface of the coil cover 80 adjacent to the main body case contact portion when viewed from the direction orthogonal to the axis L. However, the present invention is not limited to this. The coil cover 80 covers at least a part (including all) of one side surface of the coil 63, and the axial positioning means is such that the main body case contact portion is such that one side surface of the bobbin case 62 directly contacts the main body case 30 in the direction of the axis L, and when viewed from the direction orthogonal to the axis L, it is provided on the same surface or on one side with respect to one side surface of the coil cover 80 adjacent to the main body case contact portion (such as modified examples 1 to 4 of the main body case contact portion). Similar to this embodiment, the conventional problem 1 (difficulty in reducing the height of the can pump) and the conventional problem 2 (insufficient coil cooling) can be simultaneously solved, and the space can be saved and the reliability can be improved.

[0099] Also, in this embodiment, in the assembled state of the rotor unit 10 and the stator unit 50, when each of the main body case contact portions 62a1a and 62a2a serves as an action point, a stator core 61 having relatively high rigidity is arranged on the acting force line extending from each of the main body case contact portions 62a1a and 62a2a toward the other side, and the amount of deformation in the direction of the axis L is also relatively small. Therefore, fastening in the direction of the axis L can be performed more firmly. Further, in this embodiment, by designing the one-side extension amount Lex of the main body case contact portions 62a1a and 62a2a to satisfy the aforementioned (Equation 3): A + C < Lex < A + C + T, concerns (difficulty in achieving both coil insulation and height reduction) can be eliminated. In addition, in this embodiment, by forming a connector insertion hole 90ab in the coil case 90, the overall height h of the stator unit 50 satisfies the aforementioned (Equation 4): a + b + c < h < a + b + c + d. Therefore, concerns (large overall height of the stator unit due to the connector) can be eliminated.

[0100] <Others> The canned pump 100 of the present embodiment is applicable to any fluid device and fluid circuit including a refrigeration device. Needless to say, the present invention can be appropriately modified or deformed without departing from the technical idea of the present invention, and is not limited to the above-described embodiments.

Explanation of Signs

[0101] 100 Canned pump 1 Suction-side joint member 2 Discharge-side joint member 5 Bracket 5a Recess 5b Top plate 5c Overhanging portion 5ca Fastening hole 6 Thrust washer 7 Anti-loosening member 8 Fastening member 8a Threaded portion 9 Cable insertion hole 10 Rotor unit 20 Rotor 21 Impeller member 21a Bearing portion 21b Base end portion 21c Enlarged diameter portion 21d Suction blade portion 21e Outer blade portion 22 Rotor magnet 30 Main body case 31 One-side main body case 31a Top wall 31b Side peripheral wall 31c One opening 31d Inner wall of the other end 31e Protrusion 32 Other-side main body case 32a Outer peripheral flange 32b Blade housing portion 32c Rotor magnet housing portion 32d Shaft fixing member housing portion 41 Shaft fixing member 41a Shaft hole 42 Fixed shaft 43 Blade case 43a One side 43aa Opening 43b Leg 43c Side peripheral wall 50 Stator unit 60, 60’, 60’’ Stator 61 Stator core 62 Bobbin case 62a Bobbin case body 62ab Body part 62a1, 62a1’’, 62a1’’’ First wall part 62a1a Body case abutting part of the first wall part (body case abutting part, axial positioning means) 62a1b Substrate abutting part of the first wall part 62a1h Body insertion hole 62a2, 62a2’, 62a2’’’ Second wall part 62a2a Body case abutting part of the second wall part (body case abutting part, axial positioning means) 62a2b Substrate abutting part of the second wall part 62a2i Inner peripheral surface 62a3’’’ Protruding part (body case abutting part, axial positioning means) 62b Support part 62ba Notch part 63 Coil 64 Terminal pin 70 Substrate 70a Opening 70b Notch part 70c Connector 70d Cable 70h Pin hole 80, 80’, 80’’’, 80’’’’ Coil cover 80a, 80a’’’ Covering part 80aa Opening 80b, 80b’ Mounting part 80c, 80c’ Connecting part 80d, 80d’ Outer opening of the covering part 80e Fastening hole 80f Hanging wall 90 Coil case 90a Coil case bottom (other side of the coil case) 90aa Opening 90ab Connector insertion hole 90b Coil case side 90ba Notch for cable 90c Bobbin case receiving part 90ca Fastening hole a Height of the first wall part or the second wall part A Thickness of the wound coil b Thickness of the substrate B Gap required for insulation between the coil and the main body case c Thickness of the connector C Thickness of the body part d Thickness of the coil case bottom h Total height of the stator unit L Axis Lex Extension amount on one side of the main body case contact part S Slit S1 Radial fluid path S2 Impeller accommodation space T Plate thickness of the coil cover

Claims

1. A rotor unit having a rotor magnet provided on a blade wheel member, a rotor that rotates about an axis, and a main body case that houses the rotor, A stator unit having a stator in which a coil is wound via a bobbin case, and a coil cover that is detachably disposed on one side of the coil and protects the coil, Axial positioning means for axially positioning the rotor unit and the stator unit that are axially detachable, so that the rotor magnet is disposed inside the stator in the radial direction, Comprising, The coil cover covers at least a part of one side surface of the coil, The axial positioning means has a main body case abutting portion where one side surface of the bobbin case directly abuts the main body case in the axial direction, The main body case abutting portion is provided on the same surface or on one side with respect to one side surface of the coil cover adjacent to the main body case abutting portion when viewed from a direction orthogonal to the axis, and is characterized by a canned pump.

2. The bobbin case, A first wall portion forming a main body insertion hole into which the main body case is inserted, A second wall portion surrounding the coil from the outer peripheral side, A body portion that connects the first wall portion and the second wall portion and around which the coil is wound, and has, The main body case abutting portion is constituted by the first wall portion, and the canned pump according to claim 1 is characterized.

3. The bobbin case, A first wall portion forming a main body insertion hole into which the main body case is inserted, A second wall portion surrounding the coil from the outer peripheral side, A body portion that connects the first wall portion and the second wall portion and around which the coil is wound, and has, The main body case abutting portion is constituted by the second wall portion, and the canned pump according to claim 1 is characterized.

4. The bobbin case, A first wall portion forming a main body insertion hole into which the main body case is inserted, A second wall portion surrounding the coil from the outer peripheral side, A body portion that connects the first wall portion and the second wall portion and around which the coil is wound, and has, The main body case abutting portion is constituted by the first wall portion and the second wall portion, and the canned pump according to claim 1 is characterized.

5. The coil cover, A covering portion that covers at least a part of one side surface of the coil, A mounting portion provided on the outer side in the radial direction of the covering portion and mounted on the stator, a plurality of connecting portions connecting the covering portion and the placing portion; The contact portion of the main body case is inserted into an outer peripheral opening of the covering portion, which is at least defined by the covering portion and a pair of adjacent connecting portions, according to any one of claims 1, 3, and 4.

6. The connecting portion extends from the outer peripheral edge of the covering portion to the other side. The placing portion extends radially outward from the other end of the connecting portion, according to claim 5.

7. The coil cover has a covering portion covering at least a part of one side surface of the coil, a placing portion provided on the radially outer side of the covering portion and placed on the stator, a plurality of connecting portions connecting the covering portion and the placing portion; A plurality of body case contact portions of the second wall portion are provided discontinuously along the circumferential direction via slits. The slit is formed at a position where the body portion is not disposed inside the slit in the radial direction. The connecting portion is inserted into the slit, according to claim 3 or claim 4.

8. The stator unit is disposed on the other side of the coil and further includes a coil case for protecting the coil. A main body insertion hole is formed in the other side portion of the coil case. When the other end of the main body case is inserted into the main body insertion hole, the other end of the main body case does not protrude outside the other side portion of the coil case, according to claim 1.

9. The stator unit further includes a substrate for controlling a drive signal to the coil and a coil case for protecting the coil, which is disposed on the other side of the coil. One side surface of the substrate is abutted against the stator, and a connector for a power supply terminal to the substrate is connected to the other side surface of the substrate. A connector insertion hole is formed in the other side portion of the coil case. When the connector is inserted into the connector insertion hole, the other end of the connector does not protrude outside the other side portion of the coil case, according to claim 1.

10. A cooling device including the can pump according to claim 1.

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