Canned pump and cooling device including the same

Abstract

To provide a canned pump which can stably hold a bobbin case with a load via a body case abutment part while suppressing the application of an unnecessary load to a base plate by devising the arrangement of the body case abutment part, a coil case abutment part, and the base plate, and to provide a cooling device including the same.SOLUTION: A canned pump 100-1 includes a rotor unit 10 and a stator unit 50 detachable in an axis L direction, and base plate deformation suppressing means. A bobbin case 62 is held between a body case 30 and a coil case 90 in the axis L direction. The base plate deformation suppressing means has a body case abutment part 62a1a located on one lateral face of the bobbin case body 62a on the radial outside of a body insertion hole 62a1h, where the body case abutment part 62a1a, the coil case abutment part 62bb, and the base plate 70 are arranged sequentially from one side to the other side in the axis L direction.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] In Patent Document 1, as shown in FIG. 13, there is described a canned pump 1300 (hereinafter referred to as "conventional canned pump") including an impeller member 1321 having a rotor magnet 1322 rotatable around an axis L, a rotor unit 1310 housed in a main body case 1330, a stator 1360, and a stator unit 1350 having a substrate 1370 connected to the stator 1360, and the rotor unit 1310 and the stator unit 1350 are detachable from each other. Here, the stator 1360 has a coil 1363 wound around a bobbin case 1362 covering a part of a stator core 1361.

[0003] In the conventional canned pump 1300, in a state where the rotor unit 1310 is removed from the stator unit 1350, a coil cover 1380 and a coil case 1390 are fixed to one side (upper side in the figure) and the other side (lower side in the figure) of the bobbin case 1362 so as to cover the coil 1363 in order to prevent physical contact with the coil 1363 and adhesion of foreign matters such as dust.

[0004] Here, although illustration and description are omitted in Patent Document 1, in the conventional canned pump 1300, as shown in FIGS. 14(a) and 14(b), when assembling the stator unit 1350, first, a coil case contact portion 1362bb (see FIG. 13) of a support portion 1362b provided at each corner of the stator 1360 is placed on a bobbin case receiving portion 1390c provided at each corner of a coil case bottom portion 1390a and a coil case side portion 1390b. Then, the coil cover 1380 is placed so as to cover one end side of the stator 1360 and the bobbin case 1362.

[0005] Next, as shown in FIG. 13, when assembling the rotor unit 1310 to the stator unit 1350, the rotor magnet housing portion 1332c of the main body case 1330 is directly abutted against the other end portion 1362a (refer to the lattice pattern in FIGS. 13 and 14(b)) of the bobbin case 1362 having an L-shaped cross-sectional shape and serving as the main body case abutting portion. Then, by rotating the rotor unit 1310 relative to the stator unit 1350 about the axis L, a load F13 directed toward the other side in the direction of the axis L is generated via the connecting means 1305, and the blade housing portion 1332b of the main body case 1330 is connected to the coil cover 1380.

[0006] Therefore, in the conventional canned pump 1300, since the other end portion 1362a of the bobbin case 1362 (refer to the lattice pattern in FIGS. 13 and 14(b)) is in direct contact with the substrate 1370, in the assembled state of the rotor unit 1310 and the stator unit 1350, the load F13 directed toward the other side in the direction of the axis L is directly applied to the substrate 1370. Further, since the length of the arm of the load F13 (the radial length from the other end portion 1362a of the bobbin case 1362 to the bobbin case receiving portion 1390c) L13 is relatively large, a relatively large bending moment acts on the bobbin case 1362, that is, on the substrate 1370.

[0007] As a result, in the conventional canned pump 1300, there has been a risk of damage to the substrate 1370 itself or solder cracking of the pins 1364 that fix the substrate 1370 to the bobbin case 1362 (hereinafter referred to as "conventional problem 1 (substrate breakage due to large bending moment)").

[0008] In the conventional canned pump 1300, the bobbin case 1362 is sandwiched in the axial direction of the axis L between the main body case 1330 and the coil case 1390 via the main body case contact portion 1362a and the coil case contact portion 1362bb by the load F13. However, in the bobbin case 1362, the main body case contact portion 1362a and the coil case contact portion 1362bb are arranged in this order in a direction opposite to the direction in which the load F13 is applied (from one side to the other side in the axial direction of the axis L). Therefore, this load F13 does not directly act on the coil case contact portion 1362bb, but after being converted into other unfavorable forms of force (such as bending force and tensile force), it acts on the coil case contact portion 1362bb.

[0009] As a result, in the conventional canned pump 1300, there was a possibility that the bobbin case 1362 could not be stably sandwiched in the axial direction of the axis L between the main body case 1330 and the coil case 1390 due to the dissipation of the load F13 (hereinafter referred to as "conventional problem 2 (unstable clamping due to load dissipation)").

[0010] Although the bobbin case 1362 is finally fastened and fixed between the main body case 1330 and the coil case 1390 via the fastening member 1308, in order to counter the other unfavorable forms of force acting on the bobbin case 1362, there was a possibility that an excessively large fastening force, which was originally unnecessary, was required for the fastening member 1308. Therefore, even when the rotor unit 1310 and the stator unit 1350 were fastened and fixed to each other by the fastening member 1308, the conventional problem 1 (substrate breakage due to large bending moment) and the conventional problem 2 (unstable clamping due to load dissipation) could not be fundamentally solved.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0012] An object of the present invention is to devise the arrangement of the main body case contact portion, the coil case contact portion, and the substrate, thereby suppressing the application of unnecessary loads to the substrate, and stably sandwiching the bobbin case by the load via the main body case contact portion. To provide a canned pump and a cooling device including the same.

Means for Solving the Problems

[0013] To solve the above problems, a rotor magnet is provided on an impeller member, a rotor unit having a rotor that rotates about an axis and a main body case that houses the rotor, and a stator core having a coil wound around a bobbin case. A stator unit having a stator, a substrate fixed to the other side of the bobbin case, and a coil case disposed on the other side of the substrate and protecting the coil, and the rotor unit and the stator unit that are detachable in the axial direction are arranged inside the stator in the radial direction. A canned pump comprising substrate deformation suppressing means for suppressing deformation of the substrate due to a load along the direction of axis L in an assembled state where the rotor magnet is disposed, wherein the bobbin case includes a main body insertion hole into which the main body case is inserted, and a main body case contact portion that directly contacts the main body case in the axial direction. A bobbin case main body provided respectively, and a support portion provided with a coil case contact portion supported by the coil case, and is sandwiched in the axial direction between the main body case and the coil case via the main body case contact portion and the coil case contact portion. The substrate deformation suppressing means is such that the main body case contact portion is on one side surface of the bobbin case main body on the outer side in the radial direction of the main body insertion hole, and from one side in the axial direction to the other side, the main body case contact portion, the coil case contact portion, and the substrate are arranged in this order.

[0014] Also, in the above-described canned pump, the bobbin case body has a first wall portion that defines the main body insertion hole, 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 substrate deformation suppressing means may be configured by at least one of the first wall portion and the second wall portion, where the main body case contact portion forms a double concentric circle centered on the axis.

[0015] Also, in the above-described canned pump, the substrate deformation suppressing means may be such that in the assembled state of the rotor unit and the stator unit, the stator core enclosed in the bobbin case body is interposed on the acting force line extending from the main body case contact portion, where a load is applied, toward the other side.

[0016] Also, in the above-described canned pump, a connector for power supply terminals to the substrate is connected to the other side surface of the substrate. The coil case includes an other side portion of the coil case that covers at least a part of the other side surface of the substrate. A connector insertion hole is formed in the other side portion of the coil case. The substrate deformation suppressing means may be such that in a state where the connector is inserted into the connector insertion hole, the other end portion of the connector does not protrude outside the other side portion of the coil case.

[0017] Further, the canned pump further includes substrate cooling means for cooling the substrate by ventilation. The substrate is suspended on the other side of the bobbin case. The coil case has an other side portion of the coil case that covers at least a part of the other side surface of the substrate, and a side portion of the coil case that stands upright from the periphery of the other side portion of the coil case. It has a coil other-side space defined by the first wall portion, the second wall portion, the substrate, and the coil, and a substrate accommodation space defined by the substrate and the coil case. The substrate cooling means is provided with a ventilation port communicating with the substrate accommodation space in at least one of the other side portion of the coil case and the side portion of the coil case, and ventilation means communicating in the radial direction is provided between each of the other sides of the first wall portion and the second wall portion and the substrate, and the coil other-side space and the substrate accommodation space may be constantly communicated with each other.

[0018] Further, in the canned pump, the ventilation means may have a plurality of wall portion slits penetrating in the radial direction at the other end portions of the first wall portion and the second wall portion.

[0019] Further, in the canned pump, the ventilation means may have a separation slit formed by separating the other side surface of either one of the first wall portion and the second wall portion from the substrate.

[0020] Further, in the canned pump, the bobbin case body is provided on the radially outer side of the second wall portion and includes a plurality of protruding portions whose other side surfaces are in direct contact with the substrate in the axial direction. The ventilation means has a plurality of wall portion slits penetrating in the radial direction at the other end portions of the protruding portions, and the other side surfaces of the first wall portion and the second wall portion may each have a separation slit formed by separating from the substrate.

[0021] Further, a cooling device may include the above-described canned pump.

Effects of the Invention

[0022] According to the present invention, by devising the arrangement of the main body case contact portion, the coil case contact portion, and the substrate, it is possible to suppress the application of unnecessary loads to the substrate, and to stably clamp the bobbin case by the load via the main body case contact portion, thereby providing a canned pump and a cooling device including the same.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Embodiments for Carrying Out the Invention

[0024] Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 12. 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 this impeller type is only an example, and other impeller types such as a cascade impeller can be adopted.

[0025] <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, FIG. 7(b), FIG. 9(a), FIGS. 10 to 11, and FIG. 12(a). In the description of this specification and the claims, "one end" and "the other end" indicate the "upper end" and "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 "lower side" in the drawing. In the description of this specification and the claims, the "main body case contact portion" is not limited to the first wall portion and the second wall portion in the bobbin case. For example, it may be on one side surface of the bobbin case main body on the outer side in the radial direction of the main body insertion hole. In the description of this specification and the claims, the "substrate contact portion" is not limited to the first wall portion and the second wall portion in the bobbin case. For example, it may be a protruding portion extending to the other side in the axial direction on the outer side in the radial direction of the second wall portion. In the description of this specification and the claims, the "length of the arm of the load" indicates the "radial length from the inner end of the bobbin case receiving portion to the inner end of the main body case contact portion as viewed from the axial direction".

[0026] (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. 9, 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 axial direction of the axis L. Hereinafter, each configuration of the canned pump 100 will be described in order.

[0027] <Regarding the rotor unit> First, as shown in FIGS. 1 to 5, the rotor unit 10 mainly includes a rotor 20, a main body case 30, a shaft fixing member 41, a fixed shaft 42, and a blade case 43. Hereinafter, each configuration of the rotor unit 10 will be described in order.

[0028] Here, although details will be described later, in the canned pump 100-1 of the present embodiment, as shown in FIG. 10(b), a substrate deformation suppressing means is employed. The length L1 of the arm of the load F10 applied to the main body case contact portion 62a1a is made relatively small, and the load F10 is directly transmitted to the bobbin case 62-1 without passing through the substrate 70 and without being converted into other undesirable forms of force (such as bending force or tensile force) as much as possible, and can be reliably transmitted from the main body case contact portion 62a1a to the coil case contact portion 62bb. Thereby, the conventional problem 1 (substrate breakage due to large bending moment) and the conventional problem 2 (clamping instability due to load dissipation) can be simultaneously solved, and the reliability can be improved. Further, in the canned pump 100 of the present embodiment, in order to make the substrate deformation suppressing means more reliable, the substrate deformation suppressing means (1) (double concentric main body case contact portion), the substrate deformation suppressing means (2) (stator core on the action force line), and the substrate deformation suppressing means (3) (interference prevention at the other end of the connector) are adopted, so that the concern 1 (influence due to small contact area), the concern 2 (low rigidity on the action force line), and the concern 3 (substrate deformation due to the connector) can be eliminated. Furthermore, in the canned pump 100 of the present embodiment, by adopting the substrate cooling means (stable ventilation path passing through the cooling target in the radial direction), the concern 4 (insufficient cooling of the substrate) can be eliminated.

[0029] <Regarding the rotor> As shown in FIG. 1, the rotor 20 includes an impeller member 21 and a rotor magnet 22.

[0030] The impeller member 21 includes a tubular bearing portion 21a, a base end portion 21b constituting the other side of the bearing portion 21a, a diameter-expanded portion 21c constituting the center of the bearing portion 21a and extending in the outer peripheral direction from the base end portion 21b, a suction impeller portion 21d constituting one side of the bearing portion 21a and extending in one side direction, and an outer impeller portion 21e continuously extending in the outer peripheral direction from the suction impeller portion 21d.

[0031] Note that the number of impeller members 21 in the present embodiment is eight, but it is not limited thereto and can be selected according to the use of the canned pump 100 and the required pump capacity.

[0032] 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 able to rotate around the axis L together with the rotor magnet 22.

[0033] <Regarding the main body case> The main body case 30 is made of a metal material such as stainless steel, for example, and as shown in FIG. 1, houses the rotor 20, and includes a first main body case 31 and a second main body case 32. Note that the main body case 30 in the present embodiment is made of a metal material such as stainless steel, but is not limited thereto, and may be made of a resin material, for example.

[0034] 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. In the side peripheral wall 31b of the first main body case 31, one opening 31c (see FIG. 2) and another opening (not shown) are formed at a position 270° counterclockwise from the one opening 31c when viewed in the direction of the axis L (see FIG. 3). The suction side joint member 1 and the discharge side joint member 2 are fixed to the one 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 central position of the axis L when viewed in the direction of the axis L.

[0035] The other-side main body case 32 has a circular shape when viewed in the direction of the axis L, and includes an outer peripheral flange 32a that is vertically provided on the other side, a blade housing portion 32b that horizontally extends 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 blade 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.

[0036] 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 that is surrounded by the one-side main body case 31 and the other-side main body case 32 and is 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.

[0037] <Regarding the shaft fixing member and the fixed shaft> The shaft fixing member 41 is fitted into the shaft fixing member housing portion 32d by, for example, press-fitting. This 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 by, for example, 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.

[0038] <Regarding the blade case> The blade case 43 has a circular shape when viewed in the direction of the axis L. This blade case 43 has an opening 43aa centered on the axis L, and has a first 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 first side surface 43a, and a side peripheral wall 43c connected to the outer peripheral edge of the first 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 to be 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 to be smaller than the height of the side peripheral wall 31b of the one-side main body case 31.

[0039] 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 while being in contact with one side surface of the other-side main body case 32 as shown in FIG. 2 on the suction-side joint member 1 side. 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 in contact with 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.

[0040] As shown in FIGS. 1 and 2, this impeller case 43 forms a fluid path between itself and the one-side main body case 31, and houses the suction impeller portion 21d and the outer impeller portion 21e between itself and 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.

[0041] <Regarding the fluid path of the cooling device equipped with a canned pump> Regarding the fluid path of the cooling device equipped with the canned pump 100, although not shown, it is composed of a closed circuit in which 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.) are connected in this order through the cooling circulation path and circulated back to the canned pump 100. 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, equipment, etc. is performed by utilizing the circulation of the fluid, it has excellent durability, operability, and quietness.

[0042] 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.

[0043] 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 sucked 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.

[0044] Then, the fluid sucked into the opening 43aa of the impeller case 43 moves in a spiral manner along the outer radial side of the impeller accommodation space S2 and the inner circumferential side of the side wall 43c of the impeller case 43 due to the action of the centrifugal force of the outer impeller part 21e, and is finally discharged to the heat exchanger through the discharge side joint member 2.

[0045] <Regarding the stator unit> Returning here 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.

[0046] <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, and includes support portions 62b provided at respective corners, notch portions 62ba provided in the support portions 62b and through which fastening members 8 are inserted, and a plurality of terminal pins 64 (see FIG. 5) disposed on the inner peripheral side of the support portions 62b and to which the ends of the coils 63 are electrically connected.

[0047] <Regarding the substrate> As shown in FIGS. 4 and 5, the substrate 70 has a substantially rectangular shape and controls the drive signal to the coil 63. The substrate 70 includes an opening 70a centered on the axis L, notch portions 70b provided at respective corners as viewed in the direction of the axis L and through which the fastening members 8 are 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 power supply terminals to the substrate 70 is connected to the other side surface of the substrate 70.

[0048] <Regarding the coil cover> As shown in FIG. 4, the coil cover 80 covers and protects at least a part of one side surface of the coil 63 in order to prevent physical contact with the coil 63 and adhesion 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, cost reduction can be achieved as compared with resin molding of one side of the coil 63.

[0049] Specifically, as shown in FIG. 6, 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 placement 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 placement 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 placement portion 80b extends radially outward from the other end portion of the connecting portion 80c. As a result, although details will be described 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 to face one side of the placement portion 80b, so that space can be saved in the direction of the axis L. 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 placement portion 80b respectively. Although details will be described 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. Further, as shown in FIG. 5, the coil cover 80 has a hanging wall 80f hanging down from one side of the placement portion 80b.

[0050] In the present embodiment, the coil cover 80 is adopted. However, the coil cover 80 is not an essential component. For example, one side of the stator 60 may be resin-molded such that a part of one side surface of the bobbin case 62 is exposed as a main body case contact portion, or the coil cover 80 itself may be omitted.

[0051] <Regarding the coil case> As shown in FIG. 5, the coil case 90 covers and protects the other side surface of the coil 63 in order to prevent physical contact with the coil 63 and the attachment of foreign matter such as dust, and is made of a resin material. As shown in FIG. 4, this coil case 90 has a substantially rectangular shape, and includes a coil case bottom 90a (the other side portion of the coil case), a coil case side portion 90b (the side portion of the coil case) erected from the periphery of the coil case bottom 90a, and a bobbin case receiving portion 90c provided at each corner of the coil case bottom 90a and the coil case side portion 90b. The bobbin case receiving portion 90c is formed with a fastening hole 90ca that is screwed with a screw portion 8a (see FIG. 9) of the fastening member 8. An opening 90aa (vent hole) and a connector insertion hole 90ab (vent hole) centered on the axis L are formed in the coil case bottom 90a. Further, a cable notch portion 90ba (see FIG. 4) through which the cable 70d (see FIG. 2) can be inserted is formed between the coil case side portion 90b of the coil case 90 and the hanging wall 80f (see FIG. 5) of the coil cover 80.

[0052] <Regarding the bracket> As shown in FIG. 4, the bracket 5 has an outer shape with a substantially rectangular 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 direction of the axis L, overhang portions 5c that project 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 through which the fastening member 8 is inserted.

[0053] Although details will be described later, in this 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 direction of the axis L and the circumferential direction. However, the present invention is not limited to this, and for example, four L-shaped clips and fastening members or other locking members may be adopted.

[0054] <Regarding the detailed structure of the stator> Hereinafter, with reference to FIG. 7, the detailed structure (stator core 61, bobbin case 62, and coil 63) of the stator 60 in this embodiment will be described.

[0055] The stator core 61 is formed by laminating thin magnetic plates made of a magnetic material, and includes an outer peripheral ring portion (not shown) formed in an annular shape when viewed from the direction of the axis L, and a plurality (for example, nine) of salient pole portions (not shown) protruding in a T shape at equal angular pitches in the circumferential direction from the outer peripheral ring portion toward the radially inner side. The outer peripheral ring portion is arranged on the same circle when viewed from the direction of the axis L.

[0056] As shown in FIG. 7(b), the bobbin case 62 is formed of an insulating material such as resin in order to ensure the 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 is formed with a main body insertion hole 62a1h into which the main body case 30 is inserted around the axis L, and a bobbin case main body 62a that encloses the stator core 61 in the direction of the axis L. As shown in FIG. 1, a support portion 62b provided on the outer edge side of the bobbin case main body 62a and provided with a coil case abutting portion 62bb supported by the coil case 90 is provided.

[0057] Specifically, the bobbin case 62 has a plurality of first wall portions 62a1 that form the 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.

[0058] The first wall portion 62a1 is formed corresponding to the tip position of each salient pole portion of the stator core 61 and extends on one side and the other side respectively. Further, 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 from the direction of the axis L.

[0059] As shown in FIGS. 4 and 5, the second wall portion 62a2 extends on one side and the other side respectively. Further, 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 from the direction of the axis L. Here, as shown in FIGS. 4 and 7(a), a plurality (for example, four) of the second wall portions 62a2 extending on one side are arranged along the circumferential direction. The circumferential gap of this second wall portion 62a2 is formed at a position where the body portion 62ab is not arranged inside the radial direction of this circumferential gap. When assembling the stator unit 50, the connecting portion 80c of the coil cover 80 is inserted into this circumferential gap. In addition, as shown in FIG. 5, a plurality of the second wall portions 62a2 extending on the other side are arranged evenly along the circumferential direction.

[0060] In addition, although the second wall portion 62a2 in the present embodiment has been described as being arranged on the same circle when viewed from the direction of the axis L, it is not limited to this. For example, when viewed from the direction of the axis L, it may be arranged so as to form the sides of a polygon.

[0061] 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 from the direction orthogonal to the axis L. A coil 63 is wound around this body portion 62ab. Thereby, a plurality of coils 63 are provided at regular intervals in the circumferential direction. Further, as described above, since the second wall portion 62a2 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, the connecting portion 80c of the coil cover 80 inserted into the circumferential gap of the second wall portion 62a2 can prevent the coil 63 from being damaged by contacting the coil 63.

[0062] 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 (substrate contact portion) of the first wall portion and a substrate contact portion 62a2b (substrate contact portion) of the second wall portion that directly contact the substrate 70 in the axial 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 from a direction orthogonal to the axis L.

[0063] <Regarding the assembly process of the stator unit> Using FIGS. 4 to 8, 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 the substrate contact portion 62a1b of the first wall portion and the substrate contact portion 62a2b of the second wall portion (see FIG. 7(b)) are brought into contact with the substrate 70, and the terminal pins 64 are fixed to the substrate 70 by soldering.

[0064] Next, regarding the process of assembling the stator 60 and the substrate 70, which are 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 a connector insertion hole 90ab, and as shown in FIG. 4, a coil case contact portion 62bb of a support portion 62b provided at the four corners of the bobbin case 62 is placed on a bobbin case receiving portion 90c of the coil case 90.

[0065] 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 (see Fig. 7(a)) are respectively inserted into the opening 80aa of the coil cover 80, and the second wall portions 62a2 of the bobbin case 62 (see Fig. 7(a)) are respectively inserted into the outer peripheral openings 80d of the covering portions of the coil cover 80 having corresponding shapes. 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 portions 80c of the coil cover 80 are respectively inserted into the circumferential gaps in the second wall portions 62a2 of the bobbin case 62 provided at corresponding positions. At the same time, the hanging wall 80f of the bobbin case 62 (see Fig. 5) is engaged with one side of the cable notch portion 90ba of the coil case 90 (see Fig. 4), so that the cable insertion hole 9 (vent hole) shown in Fig. 2 is formed, and the cable 70d is drawn out to the outside through this cable insertion hole 9.

[0066] <Assembly process of the rotor unit and the stator unit> Using Fig. 9, the assembly process of the rotor unit 10 and the stator unit 50 will be described. First, with the axes L of the rotor unit 10 and the stator unit 50 aligned, the rotor unit 10 is moved closer to the other side of the axis L with respect to the stator unit 50.

[0067] Then, the rotor magnet housing portion 32c of the rotor unit 10 is inserted through 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 through the opening 70a of the substrate 70 and the opening 90aa of the coil case 90.

[0068] Further, by directly contacting the blade housing portion 32b of the rotor unit 10 with the main body case contact portion 62a1a (see the dot pattern in FIGS. 9(a) and 9(b)) (main body case contact portion) of the first wall portion and the main body case contact portion 62a2a (see the lattice pattern in FIGS. 9(a) and 9(b)) (main body case contact portion) of the second wall portion, 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 outer peripheral side other end of the main body case 30, that is, the other ends 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 contact portion 62a1a (see the dot pattern in FIG. 1) of the first wall portion and the main body case contact portion 62a2a (see the lattice pattern in FIG. 1) of the second wall portion can be directly contacted with the main body case 30. Further, 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 drawing direction of the cable 70d can be freely selected. In this embodiment, as shown in FIG. 1, the inner peripheral side end surface of the substrate 70 is disposed to face the other end surface of the rotor magnet housing portion 32c in a state of being separated in the axial direction L from the other end surface of the rotor magnet housing portion 32c so that the substrate 70 does not interfere with the other end surface of the rotor magnet housing portion 32c, but the present invention is not limited to this. For example, the inner diameter of the opening 70a of the substrate 70 may be increased, and the rotor magnet housing portion 32c may be accommodated and disposed in the opening 70a in a non-contact state.

[0069] Finally, by engaging the recess 5a of the bracket 5 with the protrusion 31e of the rotor unit 10, the rotation of the rotor unit 10 is stopped, and the screw 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 axial direction of the axis L. Thereby, the bobbin case 62 is sandwiched in the axial direction of the axis L between the blade accommodating portion 32b of the main body case 30 and the bobbin case receiving portion 90c of the coil case 90 via the main body case abutting portions 62a1a, 62a2a and the coil case abutting portion 62bb. By forming the opening 90aa in the coil case 90, in the assembled state of the rotor unit 10 and the stator unit 50, originally, the shaft fixing member accommodating 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 interferes with the bottom portion 90a of the coil case. In the present embodiment, the assembly of the rotor unit 10 and the stator unit 50 via the bracket 5 and the fastening member 8 is set to a fastening force that does not deform the main body case 30.

[0070] From the 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.

[0071] <Regarding Conventional Problems 1 and 2 (Substrate Breakage Due to Large Bending Moment, Clamping Instability Due to Load Dissipation)> As described above, in the conventional can pump 1300 shown in FIGS. 13 and 14, the other end portion 1362a of the bobbin case 1362 on which the load F13 is applied directly contacts the substrate 1370, and since the length L13 of the arm of the load F13 is relatively large, it had the conventional problem 1 (substrate breakage due to large bending moment). Further, in the conventional can pump 1300, in the bobbin case 1362, the body case contact portion 1362a and the coil case contact portion 1362bb were arranged in this order in a direction opposite to the direction in which the load F13 is applied (from one side to the other side in the direction of the axis L). As a result, after the load F13 is converted into another undesirable form of force (such as bending force or tensile force), it acts on the coil case contact portion 1362bb, so it had the conventional problem 2 (clamping instability due to load dissipation).

[0072] On the other hand, in the can pump 100-1 (see FIG. 10(b)) of the present embodiment, by adopting the substrate deformation suppressing means, it is possible to suppress the application of an unnecessary load to the substrate 70 and to surely transmit the load F10 to the coil case contact portion 62bb. Therefore, the conventional problem 1 (substrate breakage due to large bending moment) and the conventional problem 2 (clamping instability due to load dissipation) can be simultaneously solved, and the reliability can be improved.

[0073] <Regarding the substrate deformation suppressing means> FIG. 10(a) is a schematic diagram for explaining the load applied to the bobbin case 62 after the rotor unit 10 and the stator unit 50 shown in FIG. 9 are assembled. In the description so far, the body case contact portion has been the body case contact portion 62a1a of the first wall portion and the body case contact portion 62a2a of the second wall portion. However, the body case contact portion of the present embodiment may be in any form as long as it is on one side surface of the bobbin case body 62 outside the radial direction of the body insertion hole 62a1h. Therefore, here, in order to show a wider form that the body case contact portion of the present embodiment can take, first, the can pump 100-1 of the present embodiment shown in FIG. 10(b) will be used for explanation.

[0074] In the stator 60-1 of the canned pump 100-1 of the present embodiment, as shown in Fig. 10(b), with respect to the blade accommodating portion 32b of the main body case 30, one end of the second wall portion 62a2' does not come into contact, and only the main body case contact portion 62a1a (see the dot pattern in the figure) of the first wall portion comes into contact. The load F10 applied to the main body case contact portion 62a1a of this first wall portion has an arm length L1 of this load F10.

[0075] As shown in Fig. 10(b), the substrate deformation suppressing means is such that the main body case contact portion 62a1a is on one side surface of the bobbin case main body 62a on the radially outer side of the main body insertion hole 62a1h, and from one side (upper side) in the direction of the axis L to the other side (lower side), the main body case contact portion 62a1a, the coil case contact portion 62bb, and the substrate 70 are arranged in this order. Thereby, in the assembling process of the rotor unit 10 and the stator unit 50, the arm length L1 of the load F10 applied to the main body case contact portion 62a1a can be made smaller than the arm length L13 of the load F13 in the conventional canned pump 1300 (see Fig. 13). Therefore, the bending moment acting on the bobbin case main body 62a can also be made smaller. Further, this load F10 can be reliably transmitted from the main body case contact portion 62a1a to the coil case contact portion 62bb in the bobbin case 62-1 without passing through the substrate 70 and without being converted into other undesirable forms of force (such as bending force and tensile force) as much as possible. Furthermore, in the substrate deformation suppressing means of the present embodiment, since the first wall portion 62a1 can be used when forming the main body case contact portion 62a1a, cost reduction can be achieved. Thus, in the canned pump 100-1 of the present embodiment, by adopting the substrate deformation suppressing means shown in Fig. 10(b), it is possible to suppress the application of unnecessary load to the substrate 70. Therefore, the conventional problem 1 (substrate breakage due to large bending moment) and the conventional problem 2 (clamping instability due to load dissipation) can be solved simultaneously, the reliability can be improved, and further, cost reduction can be achieved.

[0076] In addition, in Fig. 10(b), the main body case contact portion is the main body case contact portion 62a1a of the first wall portion, but it is not limited to this. As long as it is on one side surface of the bobbin case main body 62a on the radially outer side of the main body insertion hole 62a1h, any form may be used.

[0077] As described above, in the can pump 100-1 of the present embodiment, by adopting the substrate deformation suppressing means, the conventional problem 1 (substrate breakage due to large bending moment) and the conventional problem 2 (clamping instability due to load dissipation) are simultaneously solved, and the reliability can be improved. From here, in order to further suppress the application of unnecessary loads to the substrate 70, after showing Concerns 1 to 3 inherent in the can pump 100-1 (see Fig. 10(b)) of the present embodiment and the conventional can pump 1300 (see Figs. 13 and 14), in order to eliminate these concerns, the substrate deformation suppressing means (1) to the substrate deformation suppressing means (3) adopted in the can pump 100 of the present embodiment will be described respectively. In addition, in order to solve the thermal problem of the substrate 70, after showing Concern 4 inherent in the conventional can pump 1300 (see Figs. 13 and 14), the substrate cooling means adopted in the can pump 100 of the present embodiment will be described in order to eliminate this concern.

[0078] <Regarding Concern 1 (influence due to small contact area)> In the substrate deformation suppression means of the present embodiment, as shown in FIG. 10(b), since the main body case contact portion is only the main body case contact portion 62a1a of the first wall portion, the contact area of one side surface of the bobbin case main body 62a with respect to the rotor unit 10 is relatively small. Therefore, in the substrate deformation suppression means of the present embodiment, in the assembled state of the rotor unit 10 and the stator unit 50, there is a concern that the blade housing portion 32b of the main body case 30 has an inclination with respect to the horizontal plane and cannot stably support the rotor unit 10. Further, in the substrate deformation suppression means of the present embodiment, the length L1 of the arm of the load F10 applied to the main body case contact portion 62a1a can be made smaller than the length L13 of the arm of the load F13 in the conventional canned pump 1300 (see FIG. 13). However, in the substrate deformation suppression means of the present embodiment, since a relatively large load F10 is still locally applied, there is a concern that the effect of reducing the bending moment acting on the bobbin case main body 62a cannot be sufficiently exerted (hereinafter referred to as "concern item 1 (influence due to small contact area)").

[0079] On the other hand, as shown in FIG. 10(a), in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppression means (1) (double concentric main body case contact portion), concern item 1 (influence due to small contact area) is eliminated, the rotor unit 10 can be stably supported, and the effect of reducing the bending moment acting on the bobbin case main body 62a can be sufficiently exerted.

[0080] <Regarding the substrate deformation suppression means (1) (double concentric main body case contact portion)> The substrate deformation suppressing means (1) (double concentric main body case contact portions) is configured such that, as shown in Fig. 10(a), the main body case contact portions are the main body case contact portion 62a1a of the first wall portion (see the dotted pattern in the figure) and the main body case contact portion 62a2a of the second wall portion (see the lattice pattern in the figure). Thus, in the substrate deformation suppressing means (1) (double concentric main body case contact portions) of the present embodiment, the contact areas of the main body case contact portions 62a1a and 62a2a with respect to the rotor unit 10 can be made relatively large, and the shape of this contact surface can be formed into double concentric circles centered on the axis L. Also, in the substrate deformation suppressing means (1) (double concentric main body case contact portions) of the present embodiment, as shown in Fig. 10(b), the load F10 in the substrate deformation suppressing means is dispersed into a load F1 applied to the main body case contact portion 62a1a of the first wall portion and a load F2 applied to the main body case contact portion 62a2a of the second wall portion and made smaller, and the length L2 of the arm of the load F2 can be made smaller than the length L1 of the arm of the load F1, so that the total bending moment can be made smaller. Further, in the substrate deformation suppressing means (1) (double concentric main body case contact portions) of the present embodiment, since the first wall portion 62a1 and the second wall portion 62a2 can be used when forming the main body case contact portions 62a1a and 62a2a, cost reduction can be achieved. Thereby, in the can pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (1) (double concentric main body case contact portions), concern 1 (influence due to small contact area) is eliminated, the rotor unit 10 is stably supported, the effect of reducing the bending moment acting on the bobbin case main body 62a is sufficiently exerted, and further cost reduction can be achieved.

[0081] <Regarding Concern 2 (Low rigidity on the action force line)> In the conventional can pump 1300 shown in Fig. 13, since no member with relatively high rigidity is interposed on the action force line extending from the other end portion 1362a of the bobbin case 1362 where the load F13 is applied toward the other side, there was a concern that the amount of deformation in the axial direction of the axis L in the bobbin case 1362 and the substrate 1370 would become extremely large (hereinafter referred to as "Concern 2 (Low rigidity on the action force line)").

[0082] In contrast, as shown in Fig. 10(a), in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (2) (stator core on the action force line), concern item 2 (low rigidity on the action force line) is eliminated, and the deformation amount in the axial direction L of the bobbin case 62 and the substrate 70 can be made extremely small.

[0083] <Regarding the substrate deformation suppressing means (2) (stator core on the action force line)> As shown in Fig. 10(a), for the substrate deformation suppressing means (2) (stator core on the action force line), when a load F1 and a load F2 are respectively applied to the main body case contact portions 62a1a of the first wall portion and 62a2a of the second wall portion and become the action points, a stator core 61 having a relatively high rigidity is arranged on the action force line directed from each of the main body case contact portions 62a1a and 62a2a to the other side. Thereby, in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (2) (stator core on the action force line), concern item 2 (low rigidity on the action force line) is eliminated, and the deformation amount in the axial direction L of the bobbin case 62 and the substrate 70 can be made extremely small. Further, in the canned pump 100 of the present embodiment, the loads F1 and F2 can be surely transmitted from the main body case contact portions 62a1a and 62a2a to the coil case contact portion 62bb in the bobbin case 62 without being converted into other unfavorable forms of force (such as bending force and tensile force) as much as possible.

[0084] <Regarding concern item 3 (deformation of the substrate by the connector)> In the conventional canned pump 1300 shown in Fig. 13, on the other side surface of the substrate 1370, which is the other side of the stator unit 1350, a connector 1370c for the power supply terminal to the substrate 1370 is provided. At this time, there was a concern that the substrate 1370 would be deformed in one side direction of the axis L due to the interference between the connector 1370c and the bottom portion 1390a of the coil case (hereinafter referred to as "concern item 3 (deformation of the substrate by the connector)").

[0085] On the other hand, as shown in FIG. 2, in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (3) (prevention of interference at the other end of the connector), concern item 3 (deformation of the substrate due to the connector) can be eliminated, and the reliability can be improved.

[0086] <Regarding the substrate deformation suppressing means (3) (prevention of interference at the other end of the connector)> As shown in FIG. 2, the substrate deformation suppressing means (3) (prevention of interference at the other end of the connector) forms a connector insertion hole 90ab in the bottom portion 90a of the coil case so that the connector 70c does not interfere with the bottom portion 90a of the coil case, and inserts the connector 70c into this connector insertion hole 90ab. Further, the substrate deformation suppressing means (3) (prevention of interference at the other end of the connector) is provided so that the other end of the connector 70c does not protrude outside the bottom portion 90a (the other side portion of the coil case) of the coil case in a state where the connector 70c is inserted into the connector insertion hole 90ab. Thereby, the connector 70c does not interfere with the bottom portion 90a of the coil case in the direction of the axis L, and also does not interfere with the floor or the like when the canned pump 100 is directly placed on the floor or the like. Thereby, in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (3) (prevention of interference at the other end of the connector), concern item 3 (deformation of the substrate due to the connector) can be eliminated, and the reliability can be improved.

[0087] <Regarding concern item 4 (insufficient cooling of the substrate)> In the conventional canned pump 1300 shown in FIG. 13, the other end portions of the first wall portion 1362a1 and the second wall portion 1362a2 each serve as a substrate contact portion. Here, the substrate contact portion 1362a1b of the first wall portion is arranged in a plurality along the circumferential direction via a wall slit SL13 (see FIG. 14(b)), and the substrate contact portion 1362a2b of the second wall portion, although not shown, is formed continuously in the circumferential direction. Further, as shown in FIG. 13, in the coil case 1390, a coil other-side space A1 defined by the first wall portion 1362a1, the second wall portion 1362a2, the substrate 1370, and the coil 1363, and a substrate accommodation space A2 defined by the substrate 1370 and the coil case 1390 are respectively formed.

[0088] Therefore, in the conventional canned pump 1300, since the substrate accommodation space A2 communicates with the external environment through the opening 1390aa of the coil case bottom portion 1390a, which has a relatively large opening area, a ventilation path is formed in the substrate accommodation space A2 by convection, and the other end face of the substrate 1370 can be cooled by the inflowing ambient air. On the other hand, the coil other-side space A1 communicates with the substrate accommodation space A2 only through the wall slit SL13. Therefore, since it is necessary to allow the inflow and outflow of the ambient air to the coil other-side space A1 through the same wall slit SL13, the flow of the ventilation path in the vicinity of the wall slit SL13 stagnates, resulting in extremely low cooling efficiency for the coil other-side space A1. As a result, there has been a concern that sufficient cooling cannot be performed on one end face of the substrate 1370, which generates heat reception and self-heating from the coil 1363, which is a heat source (hereinafter referred to as "Concern 4 (insufficient cooling of the substrate)"). In addition, in the conventional canned pump 1300, when the coil case bottom portion 1390a is directly placed on the floor or the like, the opening 1390aa of the coil case bottom portion 1390a is completely closed, so that not only one end face of the substrate 1370 but also the other end face of the substrate 1370 has Concern 4 (insufficient cooling of the substrate).

[0089] Note that the other-side coil space A1 formed between the substrate 1370 and the coil 1363 communicates with the space in the direction of the axis L that extends to the upper part of the coil 1363 on one side in the direction of the axis L (the space surrounded by the adjacent coils 1363 in Fig. 14(b)). However, since this space in the direction of the axis L is surrounded by the coil 1363 which is a heat source, the cooling effect on the other-side coil space A1 is extremely low.

[0090] On the other hand, as shown in Figs. 2, 5, and 10(a), in the canned pump 100 of the present embodiment, by adopting a substrate cooling means (a stable ventilation path that passes through the object to be cooled in the radial direction), concern 4 (insufficient cooling of the substrate) can be eliminated, and the reliability can be improved.

[0091] <Regarding the substrate cooling means (a stable ventilation path that passes through the object to be cooled in the radial direction)> In the substrate cooling means (a stable ventilation path that passes through the object to be cooled in the radial direction), as shown in Fig. 10(a), in the coil case 90, the substrate 70 is suspended by the substrate contact portion 62a1b of the first wall portion (refer to the dot pattern in the figure) and the substrate contact portion 62a2b of the second wall portion (refer to the lattice pattern in the figure) (the other side of the bobbin case). The other-side coil space A1 defined by the first wall portion 62a1, the second wall portion 62a2, the substrate 70, and the coil 63, and the substrate accommodation space A2 defined by the substrate 70 and the coil case 90 are respectively formed. Further, in the substrate cooling means (a stable ventilation path that passes through the object to be cooled in the radial direction), as shown in Fig. 5, wall slits SL1 and SL2 (refer to Fig. 5) that penetrate in the radial direction are respectively formed in the gaps between the first wall portions 62a1 that extend to the other side and are arranged in plurality along the circumferential direction, and in the gaps between the second wall portions 62a2.

[0092] Therefore, in the canned pump 100 of the present embodiment, the substrate accommodation space A2 communicates with the external environment through the opening 90aa at the bottom of the coil case 90a, which has a relatively large opening area. Thus, a ventilation path by convection is formed to connect the substrate accommodation space A2 and the external environment, and the other end face of the substrate 70 can be cooled by the inflowing ambient air. In addition, the coil other side space A1 to be cooled always communicates with the substrate accommodation space A2 at the inner and outer sides in the radial direction through the wall slits SL1 and SL2 (see FIG. 5), which are ventilation means. Therefore, a ventilation path passing through the coil other side space A1 in the radial direction is formed. As a result, a stable ventilation path by steady convection is formed between the coil other side space A1 and the external environment through the substrate accommodation space A2, and the one end face of the substrate 70 can be effectively cooled by the inflowing ambient air.

[0093] Further, the canned pump 100 of the present embodiment includes an opening 90aa and a connector insertion hole 90ab provided at the bottom 90a of the coil case, and a cable insertion hole 9 provided at the side portion 90b of the coil case. Therefore, when the canned pump 100 is directly placed on the floor or the like, the opening 90aa and the connector insertion hole 90ab provided at the bottom 90a of the coil case are closed, while the cable insertion hole 9 provided at the side portion 90b of the coil case can still communicate with the external environment. Thus, in the canned pump 100 of the present embodiment, by adopting the substrate cooling means (a stable ventilation path passing through the object to be cooled in the radial direction), the concern 4 (insufficient cooling of the substrate) can be eliminated and the reliability can be improved.

[0094] Note that the ventilation ports in the canned pump 100 of the present embodiment employ all of the opening 90aa, the connector insertion hole 90ab, and the cable insertion hole 9 shown in FIG. 2, but are not limited thereto. For example, since the canned pump 100 may be placed with the bottom 90a of the coil case separated from the floor or the like, it is sufficient that a ventilation port is formed in at least one of the bottom 90a of the coil case and the side portion 90b of the coil case.

[0095] <Regarding the ventilation means> As shown in FIG. 5, the ventilation means in the can pump 100 of the present embodiment includes a wall portion slit SL1 that radially penetrates the gap between a plurality of other first wall portions 62a1, and a wall portion slit SL2 that radially penetrates the gap between a plurality of other second wall portions 62a2. Note that the ventilation means may take various forms as long as it forms a ventilation path that communicates the inner and outer sides in the radial direction in the coil other space A1 with the substrate accommodation space A2 and passes in the radial direction.

[0096] Hereinafter, the ventilation means modification example (1) to the ventilation means modification example (3) will be described with reference to FIGS. 11 and 12. First, the ventilation means modification examples (1) and (2) are different from the present embodiment in that only one of the other ends of the first wall portion 62a1 and the other end of the second wall portion 62a2 in the bobbin cases 62', 62'' of the stators 60', 60'' serves as the substrate contact portion, but the other basic configurations are the same as those of the present embodiment. Further, the ventilation means modification example (3) is different from the present embodiment in that a protruding portion 62a3 extending to the other side is provided in the bobbin case 62''' of the stator 60''', and only the other end of this protruding portion 62a3 serves as the substrate contact portion, but the other basic configurations are the same as those of the present embodiment.

[0097] <Regarding the ventilation means modification example (1)> Using FIG. 11(a), the other end of the first wall portion 62a1 and the other end of the second wall portion 62a2' in the ventilation means modification example (1) of the present embodiment will be described. In this ventilation means modification example (1), in the bobbin case main body 62a', only the other end of the first wall portion 62a1 serves as the substrate contact portion 62a1b (see the dot pattern in the figure), so a separation slit SL3 is formed in a donut shape between the other end of the second wall portion 62a2' and the substrate 70. As a result, the ventilation means in the ventilation means modification example (1) includes the separation slit SL3 in addition to the wall portion slits SL1 and SL2.

[0098] Therefore, in the can pump 100' of the ventilation means modification example (1), through the wall slits SL1 and SL2 (see FIG. 5) and the separation slit SL3 which are the ventilation means, on the inner and outer sides in the radial direction in the coil other side space A1, it is always in communication with the substrate accommodation space A2 respectively, and forms a ventilation path that passes through the coil other side space A1 in the radial direction. Thereby, in the can pump 100' of the ventilation means modification example (1), compared with the can pump 100 of the present embodiment, since the ventilation amount to the coil other side space A1 can be increased, concern item 4 (insufficient cooling of the substrate) can be more surely eliminated, and the reliability can be further improved.

[0099] <Regarding the ventilation means modification example (2)> Using FIG. 11(b), the other end of the first wall portion 62a1' and the other end of the second wall portion 62a2 in the ventilation means modification example (2) of the present embodiment will be described. In this ventilation means modification example (2), in the bobbin case main body 62a'', only the other end of the second wall portion 62a2 becomes the substrate contact portion 62a2b (see the lattice pattern in the figure), so a separation slit SL4 is formed in a donut shape between the other end of the first wall portion 62a1' and the substrate 70. Thereby, the ventilation means in the ventilation means modification example (2) is composed of the separation slit SL4 in addition to the wall slits SL1 and SL2.

[0100] Therefore, in the can pump 100'' of the ventilation means modification example (2), through the wall slits SL1 and SL2 (see FIG. 5) and the separation slit SL4 which are the ventilation means, on the inner and outer sides in the radial direction in the coil other side space A1, it is always in communication with the substrate accommodation space A2 respectively, and forms a ventilation path that passes through the coil other side space A1 in the radial direction. Thereby, in the can pump 100'' of the ventilation means modification example (2), similar to the ventilation means modification example (1), compared with the can pump 100 of the present embodiment, since the ventilation amount to the coil other side space A1 can be increased, concern item 4 (insufficient cooling of the substrate) can be more surely eliminated, and the reliability can be further improved.

[0101] <Regarding the ventilation means modification example (3)> Using FIG. 12, the other end of the protruding portion 62a3 in the ventilation means modification example (3) of the present embodiment will be described. In the ventilation means modification example (3), as shown in FIG. 12(a), in the bobbin case main body 62a''', in addition to the first wall portion 62a1' and the second wall portion 62a2', a protruding portion 62a3 extending to the other side in the axial direction L is further provided on the radially outer side of the second wall portion 62a2'. In this ventilation means modification example (3), only the other end of the protruding portion 62a3 serves as the substrate contact portion 62a3b (refer to the vertical line pattern in the figure). Therefore, a separation slit SL4 is formed between the other end of the first wall portion 62a1' and the substrate 70, and a separation slit SL3 is formed between the other end of the second wall portion 62a2' and the substrate 70. Further, in this ventilation means modification example (3), as shown in FIG. 12(b), a wall portion slit SL5 is formed in the gap between the protruding portions 62a3 arranged in plurality along the circumferential direction. Thus, the ventilation means in the ventilation means modification example (3) is composed of separation slits SL3, SL4, and wall portion slit SL5 in addition to the wall portion slits SL1, SL2. Here, the wall portion slit SL5 has a much larger opening area than the wall portion slit SL1 and the wall portion slit SL2.

[0102] Therefore, in the can pump 100''' of the ventilation means modification example (3), through the wall portion slits SL1, SL2, SL5 and the separation slits SL3, SL4 which are the ventilation means, a ventilation path that constantly communicates with the substrate accommodation space A2 at the radially inner and outer sides in the other side space A1 of the coil and passes through the other side space A1 of the coil in the radial direction is formed. Thereby, in the can pump 100''' of the ventilation means modification example (3), compared with the can pumps 100', 100'' of the ventilation means modification examples (1) and (2), the ventilation amount to the other side space A1 of the coil can be increased. Therefore, concern item 4 (insufficient cooling of the substrate) can be more reliably eliminated and the reliability can be further improved.

[0103] As described above, in the canned pump 100-1 of the present embodiment, by adopting the substrate deformation suppressing means, the length L1 of the arm of the load F10 applied to the main body case contact portion 62a1a is made relatively small, and the load F10 can be reliably transmitted to the coil case contact portion 62bb without passing through the substrate 70. As a result, the conventional problem 1 (substrate breakage due to large bending moment) and the conventional problem 2 (clamping instability due to load dissipation) can be simultaneously solved, and the reliability can be improved.

[0104] In the canned pump 100 of the present embodiment, as shown in FIG. 10(a), the main body case contact portion is 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. In the canned pump 100-1 of the present embodiment, as shown in FIG. 10(b), the main body case contact portion is only the main body case contact portion 62a1a of the first wall portion. However, since the main body case contact portion of the present embodiment may be in any form as long as it is on one side surface of the bobbin case main body 62a on the outer side in the radial direction of the main body insertion hole 62a1h, for example, a protruding portion extending on one side surface of the bobbin case main body 62a, that is, on one side other than the first wall portion 62a1 and the second wall portion 62a2 may be used as the main body case contact portion.

[0105] Also, in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (1) (double concentric main body case contact portion), concern item 1 (influence due to small contact area) is eliminated, the rotor unit 10 is stably supported, and the effect of reducing the bending moment acting on the bobbin case main body 62a is sufficiently exerted, and cost reduction can be achieved. Further, in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (2) (stator core on the line of action force), concern item 2 (low rigidity on the line of action force) is eliminated, and the deformation amount in the axial direction L of the bobbin case 62 and the substrate 70 can be made extremely small. In addition, in the canned pump 100 of the present embodiment, by adopting the substrate deformation suppressing means (3) (interference prevention of the other end of the connector), concern item 3 (deformation of the substrate by the connector) is eliminated, and the reliability can be improved. And, in the canned pump 100 of the present embodiment, by adopting the substrate cooling means (stable ventilation path passing through the cooling target in the radial direction), concern item 4 (insufficient cooling of the substrate) is eliminated, and the reliability can be improved.

[0106] Note that in the canned pump 100 of the present embodiment, in addition to the substrate deformation suppressing means, all of the substrate deformation suppressing means (1) (double concentric main body case contact portion) to the substrate deformation suppressing means (3) (interference prevention of the other end of the connector) and the substrate cooling means (stable ventilation path passing through the cooling target in the radial direction) are adopted, but it is not limited thereto. For example, in the present embodiment, only the substrate deformation suppressing means may be adopted, or the substrate deformation suppressing means may be adopted, and at least one of the substrate deformation suppressing means (1) (double concentric main body case contact portion) to the substrate deformation suppressing means (3) (interference prevention of the other end of the connector) and the substrate cooling means (stable ventilation path passing through the cooling target in the radial direction) may be adopted.

[0107] Furthermore, the ventilation means in the canned pump 100 of the present embodiment adopts wall slits SL1 and SL2 to communicate the inner and outer sides in the radial direction in the coil other-side space A1 with the substrate accommodation space A2 and form a ventilation path passing in the radial direction. However, the ventilation means in the present embodiment may adopt any combination of the separation slits SL3 and SL4 and the wall slit SL5 shown in the ventilation means modification example (1), the ventilation means modification example (2), and the ventilation means modification example (3) as long as it communicates the inner and outer sides in the radial direction in the coil other-side space A1 with the substrate accommodation space A2 and forms a ventilation path passing in the radial direction. Thus, in the ventilation means modification example (1), the ventilation means modification example (2), and the ventilation means modification example (3), since the ventilation amount to the coil other-side space A1 can be increased, concern item 4 (insufficient cooling of the substrate) can be more reliably eliminated, and the reliability can be further improved.

[0108] <Others> It goes without saying that the canned pumps 100, 100-1, 100', 100'', 100''' of the present embodiment are applicable to any fluid device and fluid circuit including a refrigeration device. Furthermore, the present invention is not limited to the above-described embodiments, and appropriate changes and modifications can be made without departing from the technical idea of the present invention.

Explanation of Reference Numerals

[0109] 100, 100-1, 100', 100'', 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 retaining member 8 fastening member 8a screw portion 9 cable insertion hole (ventilation port) 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 Other end inner wall 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 surface 43aa Opening 43b Leg portion 43c Side peripheral wall 50 Stator unit 60, 60-1, 60’, 60’’, 60’’’ Stator 61 Stator core 62, 62-1, 62’, 62’’, 62’’’ Bobbin case 62a, 62a’, 62a’’, 62a’’’ Bobbin case body 62ab Body portion 62a1, 62a1’ First wall portion 62a1a Main body case contact portion of the first wall portion (main body case contact portion) 62a1b Substrate contact portion of the first wall portion (substrate contact portion) 62a1h Main body insertion hole 62a2, 62a2’ Second wall portion 62a2a Main body case contact portion of the second wall portion (main body case contact portion) 62a2b Substrate contact portion of the second wall portion (substrate contact portion) 62a2i Inner peripheral surface 62a3 Protruding portion 62a3b Substrate contact portion of the protruding portion (substrate contact portion) 62b Support portion 62ba Notch portion 62bb Coil case contact portion 63 Coil 64 Terminal pin 70 Substrate 70a Opening 70b Notch portion 70c Connector 70d Cable 70h Pin hole 80 Coil cover 80a Covering portion 80aa Opening 80b Mounting portion 80c Connecting portion 80d Outer peripheral opening of the covering portion 80e Fastening hole 80f Hanging wall 90 Coil case 90a Bottom portion of the coil case (the other side portion of the coil case) 90aa Opening (ventilation port) 90ab Connector insertion hole (ventilation port) 90b Side portion of the coil case (the side portion of the coil case) 90ba Notch portion for cable 90c Bobbin case receiving portion 90ca Fastening hole A1 Space on the other side of the coil A2 Substrate accommodation space F1,F2,F10 Load L Axis L1,L2 Length of the arm S1 Radial fluid path S2 Impeller accommodation space SL1,SL2,SL5 Wall slits (ventilation means) SL3,SL4 Spacing slits (ventilation means)

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 around a stator core via a bobbin case, a substrate fixed to the other side of the bobbin case, and a coil case disposed on the other side of the substrate and protecting the coil, Substrate deformation suppressing means for suppressing deformation of the substrate due to a load along the axis L direction in an assembled state where the rotor unit and the stator unit, which are detachable in the axial direction, are disposed inside the stator in the radial direction and the rotor magnet is disposed, The bobbin case has a bobbin case main body provided with a main body insertion hole into which the main body case is inserted and a main body case contact portion that directly contacts the main body case in the axial direction, and a support portion provided with a coil case contact portion supported by the coil case, and is sandwiched in the axial direction between the main body case and the coil case via the main body case contact portion and the coil case contact portion, The substrate deformation suppressing means is, The main body case contact portion is on one side surface of the bobbin case main body on the outer side in the radial direction of the main body insertion hole, and is arranged in the order of the main body case contact portion, the coil case contact portion, and the substrate from one side in the axial direction to the other side. A canned pump characterized by that.

2. The bobbin case main body is, A first wall portion that defines the main body insertion hole, A second wall portion that surrounds 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, The substrate deformation suppressing means is, The canned pump according to claim 1, wherein the main body case contact portion is constituted by at least one of the first wall portion and the second wall portion that forms a double concentric circle centered on the axis.

3. The substrate deformation suppressing means is, The canned pump according to claim 1, wherein in the assembled state of the rotor unit and the stator unit, the stator core included in the bobbin case main body is interposed on the acting force line from the main body case contact portion toward the other side where the load is applied.

4. A connector for feeding power to the substrate is connected to the other side surface of the substrate, The coil case includes a coil case other side portion that covers at least a part of the other side surface of the substrate. On the other side of the coil case, a connector insertion hole is formed. The substrate deformation suppressing means The can pump according to claim 1, wherein in a state where the connector is inserted into the connector insertion hole, the other end of the connector does not protrude outside the other side of the coil case.

5. Further comprising substrate cooling means for cooling the substrate by ventilation, The substrate is suspended on the other side of the bobbin case, The coil case has an other side portion of the coil case that covers at least a part of the other side surface of the substrate, and a side portion of the coil case that stands upright from the periphery of the other side portion of the coil case. It has a coil other side space defined by the first wall portion, the second wall portion, the substrate and the coil, and a substrate accommodation space defined by the substrate and the coil case. The substrate cooling means is provided with a vent communicating with the substrate accommodation space in at least one of the other side portion of the coil case and the side portion of the coil case, and ventilation means communicating in the radial direction is provided between each other side of the first wall portion and the second wall portion and the substrate, and the can pump according to claim 2, characterized in that the coil other side space and the substrate accommodation space are always communicated.

6. The can pump according to claim 5, wherein the ventilation means has a plurality of wall portion slits penetrating in the radial direction at the other end portions of the first wall portion and the second wall portion.

7. The can pump according to claim 6, wherein the ventilation means has a separation slit formed by separating the other side surface of either the first wall portion or the second wall portion from the substrate.

8. The bobbin case body is provided on the radially outer side of the second wall portion and includes a plurality of protruding portions whose other side surfaces are in direct contact with the substrate in the axial direction. The can pump according to claim 5, wherein the ventilation means has a plurality of wall portion slits penetrating in the radial direction at the other end portions of the protruding portions, and separation slits formed by separating the other side surfaces of the first wall portion and the second wall portion from the substrate, respectively.

9. A cooling device comprising the can pump according to any one of claims 1 to 8.

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