Sealed pump and cooling device provided with same

Abstract

The present invention provides a seal pump which is compact and highly reliable, and a cooling device provided with the seal pump, and which can sufficiently reduce the height of the seal pump and cool a coil by designing the shapes of a coil cover and a bobbin housing. A sealed pump is provided with: a rotor assembly (10) and a stator assembly (50) that are attachable and detachable in the direction of an axis (L); and an axial direction positioning unit. The coil cover (80) covers at least a part of one side surface of the coil (63), and the axial direction positioning means has main body housing contact sections (62a1a, 62a2a) at which one side surface of the bobbin housing (62) directly contacts the main body housing (30) in the axial (L) direction. When viewed from a direction orthogonal to the axis (L), the main body case contact sections (62a1a, 62a2a) are provided on the same surface or one side with respect to one side surface of the coil cover (80) adjacent to the main body case contact sections (62a1a, 62a2a).

Description

Technical Field

[0001] The present invention relates to a sealed pump having a coil cover and a cooling device including the sealed pump. Background Art

[0002] In Patent Document 1, as Figure 12 shown, a sealed pump 1200 (hereinafter referred to as "conventional sealed pump") is described. An impeller member 1221 having a rotor magnet 1222 capable of rotating about an axis L includes: a rotor assembly 1210 housed in a main body housing 1230; and a stator assembly 1250 having a coil 1263 wound around a bobbin housing 1262 covering a part of a stator core 1261. The rotor assembly 1210 and the stator assembly 1250 can be detachably attached to each other.

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

[0004] Among them, in the conventional sealed pump 1200, when the rotor assembly 1210 is attached to the stator assembly 1250, first, as an axial positioning unit, a rotor magnet housing portion 1232c of the main body housing 1230 is brought into contact with the other end portion 1262a of the bobbin housing 1262 having an L-shaped cross-sectional shape (refer to the lattice pattern in the figure). Then, by rotating the rotor assembly 1210 relative to the stator assembly 1250 about the axis L, the blade housing portion 1232b of the main body housing 1230 is connected to the coil cover 1280 via a connecting unit 1205.

[0005] Therefore, in the conventional sealed pump 1200, since the coil cover 1280 and the connecting unit 1205 are interposed between the blade housing portion 1232b of the main body housing 1230 and the bobbin housing 1262, it may be impossible to achieve a low height of the sealed pump 1200 (hereinafter referred to as "conventional problem 1 (difficulty in reducing the height of the sealed pump)").

[0006] In addition, in the conventional sealed pump 1200, in order to prevent insulation deterioration, burnout, etc. of the bobbin housing 1262 caused by heat generation of the coil 1263, the inner peripheral side of the bobbin housing 1262 is disposed opposite to the rotor magnet housing portion 1232c, and the coil 1263 is cooled by a working fluid in the main body housing 1230.

[0007] Among them, in the existing hermetic pump 1200, in the main body housing 1230 that constitutes the vane accommodating portion 1232b, the working fluid always flows, so the cooling effect of the vane accommodating portion 1232b is improved. On the other hand, in the main body housing 1230 that constitutes the rotor magnet accommodating portion 1232c, the working fluid stays in a very narrow gap, so the cooling effect of the rotor magnet accommodating portion 1232c is reduced.

[0008] Therefore, in the existing hermetic pump 1200, since the inner peripheral surface of the spool housing 1262 is disposed opposite to the rotor magnet accommodating portion 1232c with a relatively low cooling effect, the cooling of the coil 1263 may be insufficient. On the other hand, it is also considered that one side surface of the spool housing 1262 is cooled by the vane accommodating portion 1232b with a relatively high cooling effect. However, in the existing hermetic pump 1200, a coil cover 1280 and a connecting unit 1205 are interposed between one side surface of the spool housing 1262 and the vane accommodating portion 1232b with a relatively high cooling effect, so the cooling of the coil 1263 based on the vane accommodating portion 1232b becomes physically difficult (hereinafter, referred to as "existing problem 2 (insufficient coil cooling)").

[0009] Prior Art Documents

[0010] Patent Documents

[0011] Patent Document 1: Japanese Patent Application Laid-Open No. 2017-125488 Summary of the Invention

[0012] Problems to be Solved by the Invention

[0013] An object of the present invention is to provide a miniaturized and highly reliable hermetic pump and a cooling device including the hermetic pump, which can sufficiently reduce the height of the hermetic pump and cool the coil by respectively designing the shapes of the coil cover and the spool housing.

[0014] Means for Solving the Problems

[0015] In order to solve the above-mentioned problems, a sealed pump is provided, comprising: a rotor assembly, which has: a rotor, in which a rotor magnet is arranged on an impeller component and rotates around an axis; and a main body casing, which accommodates the rotor; a stator assembly, which has: a stator, in which a coil is wound around a stator core via a bobbin casing; and a coil cover, which is detachably arranged on one side of the coil and protects the coil; and an axial direction positioning unit, which positions the rotor assembly and the stator assembly in the axial direction in such a way that the rotor magnet is arranged on the inner side in the radial direction of the stator in the rotor assembly and the stator assembly that are detachable in the axial direction, the coil cover covers at least a part of one side surface of the coil, and the axial direction positioning unit has a main body casing abutment portion in which one side surface of the bobbin casing directly abuts against the main body casing in the axial direction, and the main body casing abutment portion is arranged on the same surface or one side relative to one side surface of the coil cover adjacent to the main body casing abutment portion when viewed from a direction orthogonal to the axis.

[0016] In addition, in the above-mentioned sealed pump, the bobbin shell may also have: a first wall portion, which forms a main body insertion hole for inserting the main body shell; a second wall portion, which surrounds the coil from the outer peripheral side; and a main body portion, which connects the first wall portion and the second wall portion and is wound with the coil, and the main body shell abutment portion is composed of the first wall portion.

[0017] In addition, in the above-mentioned sealed pump, the bobbin shell may also have: the bobbin shell has: a first wall portion, which forms a main body insertion hole for inserting the main body shell; a second wall portion, which surrounds the coil from the outer peripheral side; and a main body portion, which connects the first wall portion and the second wall portion and is wound with the coil, and the main body shell abutment portion is composed of the second wall portion.

[0018] In addition, in the above-mentioned sealed pump, the bobbin shell may also have: a first wall portion, which forms a main body insertion hole for inserting the main body shell; a second wall portion, which surrounds the coil from the outer peripheral side; and a main body portion, which connects the first wall portion and the second wall portion and is wound with the coil, and the main body shell abutment portion is composed of the first wall portion and the second wall portion.

[0019] In addition, in the above-mentioned sealed pump, the coil cover may also include: a covering portion, which covers at least a portion of one side surface of the coil; a loading portion, which is arranged radially outside the covering portion and is loaded on the stator; and a plurality of connecting portions, which connect the covering portion and the loading portion, and the main body shell abutment portion is inserted into an outer peripheral opening of the covering portion at least defined by the covering portion and a pair of adjacent connecting portions.

[0020] In addition, in the above-described sealed pump, it is also possible that the connecting portion extends from the outer peripheral edge of the covering portion to the other side, and the placing portion extends radially outward from the other end portion of the connecting portion.

[0021] In addition, in the above-described sealed pump, it is also possible that the coil cover has: a covering portion that covers at least a part of one side surface of the coil; a placing portion that is provided on the outer side in the radial direction of the covering portion and is placed on the stator; and a plurality of connecting portions that connect the covering portion and the placing portion. A plurality of the main body housing abutting portions of the second wall portion are provided discontinuously in the circumferential direction with a slit therebetween. The slit is formed at a position where the main body portion is not disposed on the inner side in the radial direction of the slit, and the connecting portion is inserted into the slit.

[0022] In addition, in the above-described sealed pump, it is also possible that the stator assembly further includes a coil housing that is disposed on the other side of the coil and protects the coil. A main body insertion hole is formed in the other side portion of the coil housing. In a state where the other end portion of the main body housing is inserted into the main body insertion hole, the other end portion of the main body housing does not protrude outward from the other side portion of the coil housing.

[0023] In addition, in the above-described sealed pump, it is also possible that the stator assembly further includes: a substrate that controls a drive signal for the coil; and a coil housing that is disposed on the other side of the coil and protects the coil. One side surface of the substrate abuts against the stator, and a connector for a power supply terminal that supplies power 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 housing. In a state where the connector is inserted into the connector insertion hole, the other end portion of the connector does not protrude outward from the other side portion of the coil housing.

[0024] In addition, it is also possible that a cooling device includes the above-described sealed pump.

[0025] Advantages of the Invention

[0026] According to the present invention, it is possible to provide a sealed pump and a cooling device including the sealed pump that can sufficiently reduce the height of the sealed pump and cool the coil by respectively designing the shapes of the coil cover and the spool housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A longitudinal sectional view of a sealed pump according to the present embodiment ( Figure 3 the cross-sectional view taken along line I-I shown).

[0028] Figure 2 Another longitudinal sectional view of the sealed pump according to the present embodiment ( Figure 3The sectional view taken along line II-II as shown).

[0029] Figure 3 indicating Figure 1 and Figure 2 the top view of the sealed pump as shown.

[0030] Figure 4 indicating Figure 3 the exploded perspective view from above of the sealed pump as shown.

[0031] Figure 5 indicating Figure 3 the exploded perspective view from below of the sealed pump as shown.

[0032] Figure 6 is the top view showing the ways the coil cover can be taken. (a) shows this embodiment, and (b) shows a modified example of the coil cover.

[0033] Figure 7 is the explanatory view of the stator of this embodiment. (a) shows the top view, and (b) shows the sectional view taken along line VIIb-VIIb as shown in (a).

[0034] Figure 8 indicating Figure 4 and Figure 5 the perspective view from above of the assembled stator assembly as shown.

[0035] Figure 9 indicating Figure 8 the sectional view taken along line IX-IX as shown.

[0036] Figure 10 is the explanatory view of the assembly process of the rotor assembly and the stator assembly of this embodiment. (a) shows the sectional view of the rotor assembly and the stator assembly, and (b) shows the top view of the stator assembly as shown in (a).

[0037] Figure 11 is the explanatory view showing the ways the main body housing abutting portion can be taken (corresponding to Figure 10 ), (a) shows modified example 1 of the main body housing abutting portion, (b) shows modified example 2 of the main body housing abutting portion, (c) shows modified example 3 of the main body housing abutting portion, and (d) shows modified example 4 of the main body housing abutting portion.

[0038] Figure 12 shows the sectional view of the sealed pump of the prior art. Detailed implementation mode

[0039] Refer to Figures 1 to 11A detailed description of the embodiments of the present invention will be given. However, the present invention is not limited to the embodiments described herein. In the following hermetic pump, the case of using a centrifugal impeller will be described, but the form of this impeller is merely an example. For example, other forms of impellers such as cascade impellers can be used.

[0040] <Regarding terms>

[0041] In the descriptions of this specification and the claims, "left", "right", "up", and "down" indicate Figures 1 to 2 , Figure 7 of (b), Figure 9 , Figure 10 of (a), Figure 11 the directions shown. In the descriptions of this specification and the claims, "one end" and "the other end" indicate "the upper end" and "the lower end" in the drawings. In the descriptions of this specification and the claims, "one side" and "the other side" indicate "the upper side" and "the lower side" in the drawings. In the descriptions of this specification and the claims, the "outer peripheral opening of the covering portion" means "delimited by at least the covering portion and a pair of connecting portions adjacent to each other in the circumferential direction", that is, "delimited by the covering portion, a pair of connecting portions adjacent to each other in the circumferential direction, and the mounting portion" (see Figure 6 80d of (a) of Figure 6 and "delimited by the covering portion and a pair of connecting portions adjacent to each other in the circumferential direction" (see

[0042] (This embodiment)

[0043] <Regarding the structure of the hermetic pump>

[0044] Use Figures 1 to 7 , the hermetic pump 100 of this embodiment will be described. As Figure 10 shown, the hermetic pump 100 mainly includes a rotor assembly 10, a stator assembly 50, and a bracket 5. Among them, the rotor assembly 10 and the stator assembly 50 can be disassembled and assembled in the axial direction of the axis L. Hereinafter, the structures of the hermetic pump 100 will be described in sequence.

[0045] <Regarding the rotor assembly>

[0046] First, as Figures 1 to 5 shown, the rotor assembly 10 mainly includes a rotor 20, a main body housing 30, a shaft fixing member 41, a fixed shaft 42, and a blade housing 43. Hereinafter, the structures of the rotor assembly 10 will be described in sequence.

[0047] Among them, in the present embodiment, as Figure 1 and Figure 2 shown, on the premise that a detachable coil cover 80 is arranged on one side of the coil 63, by directly abutting one side surface (main body housing abutting portions 62a1a, 62a2a) of the bobbin housing 62, which is the axial direction positioning unit, against the main body housing 30 in the axial direction of the axis L, the existing problem point 1 (difficulty in reducing the height of the seal pump) and the existing problem point 2 (insufficient coil cooling) can be eliminated simultaneously, space can be saved, and reliability can be improved. Details will be described later.

[0048] <Regarding the rotor>

[0049] As Figure 1 shown, the rotor 20 includes an impeller member 21 and a rotor magnet 22.

[0050] The impeller member 21 includes a circular tubular bearing portion 21a, a base end portion 21b forming the other side of the bearing portion 21a, a diameter-expanded portion 21c forming the center of the bearing portion 21a and extending from the base end portion 21b in the outer peripheral direction, a suction blade portion 21d forming one side of the bearing portion 21a and extending in one side direction, and an outer blade portion 21e continuous with the suction blade portion 21d and extending in the outer peripheral direction.

[0051] In addition, the number of blades of the impeller member 21 in the present embodiment is 8, but it is not limited thereto, and can be selected according to the use of the seal pump 100 and the required pump capacity.

[0052] The rotor magnet 22 is composed of an annular permanent magnet and is fixed to the other side surface of the diameter-expanded portion 21c and the outer peripheral surface of the base end portion 21b in the impeller member 21 via an anti-disengagement member 7 (for example, a C-ring, etc.). Thus, the impeller member 21 is configured to be able to rotate around the axis L together with the rotor magnet 22.

[0053] <Regarding the main body housing>

[0054] As Figure 1 shown, the main body housing 30 houses the rotor 20 and includes a one-side main body housing 31 and a the-other-side main body housing 32.

[0055] The one-side main body housing 31 has a circular shape when viewed from the axial direction of the axis L, and includes a top wall 31a and a side peripheral wall 31b formed by a cylindrical shape extending from the outer peripheral edge of the top wall 31a to the other side. An opening 31c is formed in the side peripheral wall 31b of the one-side main body housing 31 (refer to Figure 2 ), and when viewed from the axial direction of the axis L, at a position rotated 270° counterclockwise from the one opening 31c (refer to Figure 3)Another opening (not shown) is formed, and the suction side joint member 1 and the discharge side joint member 2 are respectively fixed in a sealed state at one opening 31c and the other opening. Further, when viewed from the axis L direction, the one main body housing 31 is formed with a raised portion 31e (see Figure 3 ) that bulges toward 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.

[0056] The other main body housing 32 has a circular shape when viewed from the axis L direction, and includes: an outer peripheral flange 32a that is vertically provided on the other side; a blade storage portion 32b that horizontally extends from one end side of the outer peripheral flange 32a toward the inner peripheral side; a cylindrical rotor magnet storage portion 32c that is provided on the other inner peripheral side of the blade storage portion 32b; and a bottomed cylindrical shaft fixing member storage portion 32d that is provided on the other inner peripheral side of the rotor magnet storage portion 32c.

[0057] Among them, the outer peripheral flange 32a of the other main body housing 32 is fixedly installed in a sealed state on the inner wall 31d of the other end of the side peripheral wall 31b of the one main body housing 31. Thereby, an internal space surrounded by the one main body housing 31 and the other main body housing 32 and fluidly communicating with the suction side joint member 1 and the discharge side joint member 2 is formed inside the main body housing 30.

[0058] <Regarding the shaft fixing member and the fixed shaft>

[0059] The shaft fixing member 41 is fitted into the shaft fixing member storage portion 32d by press-fitting or the like, for example. 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 by press-fitting or the like. 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.

[0060] <Regarding the blade housing>

[0061] When viewed from the axis L direction, the blade housing 43 has a circular shape. The blade housing 43 includes: a side surface 43a that has an opening 43aa centered on the axis L and whose outer diameter gradually increases along the circumferential flow from the installation position of the suction side joint member 1 to the installation position of the discharge side joint member 2; a foot portion 43b that is provided on the outer peripheral side of the side surface 43a; and a side peripheral wall 43c that is respectively connected to the outer peripheral edge of the side surface 43a and the inner peripheral edge of the foot portion 43b. In addition, the outer diameter of the side peripheral wall 43c of the blade housing 43 is formed to be smaller than the inner diameter of the side peripheral wall 31b of the one main body housing 31, and the height of the side peripheral wall 43c of the blade housing 43 is formed to be smaller than the height of the side peripheral wall 31b of the one main body housing 31.

[0062] AsFigure 2 As shown, the foot portion 43b of the blade housing 43 is fixedly installed in a sealed state on the side peripheral wall 31b of the one main housing 31 in a state of abutting against one side surface of the other main housing 32 on the suction side joint member 1 side. Further, although not shown, the side peripheral wall 43c of the blade housing 43 has a shape corresponding to the side peripheral wall 31b of the one main housing 31 on the discharge side joint member 2 side, that is, an opening (not shown) is provided at a position corresponding to the other opening of the one main housing 31, and the side peripheral wall 43c of the blade housing 43 is fixedly installed together with the discharge side joint member 2 in a sealed state via the opening while abutting against the side peripheral wall 31b of the one main housing 31.

[0063] As Figure 1 well as Figure 2 shown, the blade housing 43 forms a fluid path between the one main housing 31, and on the other hand, houses the suction blade portion 21d and the outer blade portion 21e between the blade housing portion 32b of the other main housing 32. The fluid path has: a radial fluid path S1 formed between the raised portion 31e of the one main housing 31 and the blade housing 43; and an impeller housing space S2 communicating with the radial fluid path S1 via the opening 43aa of the blade housing 43. The radial fluid path S1 and the impeller housing space S2 are respectively in fluid communication with the suction side joint member 1 and the discharge side joint member 2.

[0064] <Regarding the fluid path of the cooling device equipped with a sealed pump>

[0065] Regarding the fluid path of the cooling device equipped with the sealed pump 100, although the illustration is omitted, it is connected to the sealed pump 100, the heat exchanger provided with the object to be cooled, and the radiator (for example, air cooling based on a fan, water cooling, etc.) in sequence via the cooling circulation path, and is constituted by a closed loop that circulates again in the sealed pump 100. Therefore, the object to be cooled is cooled by the working fluid (for example, water, etc.) that circulates between the heat exchanger and the radiator via the sealed pump 100. In the cooling device equipped with the sealed pump 100, the heat generating parts, equipment, etc. are cooled by the circulation of the fluid, so the durability, operability, and quietness are excellent.

[0066] Next, use Figure 1 as well as Figure 2 to explain the fluid path in the operating state of the sealed pump 100. First, by passing an electric current through the coil 63 of the stator assembly 50, the coil 63 is excited. The excitation of this coil 63 acts on the rotor magnet 22, whereby the impeller member 21 fixed to the rotor magnet 22 rotates around the fixed shaft 42 inserted through the shaft fixing member 41.

[0067] As Figure 2As shown, by the rotation of the impeller member 21, a negative pressure is generated near the opening 43aa of the vane housing 43 by the suction vane portion 21d. 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 vane housing 43 and the raised portion 31e (refer to Figure 3 ) of the one-side main housing 31 into the opening 43aa of the vane housing 43.

[0068] Moreover, the fluid sucked into the opening 43aa of the vane housing 43 moves spirally along the outer side in the radial direction of the impeller accommodation space S2 and the inner peripheral side of the side peripheral wall 43c of the vane housing 43 by the action of the centrifugal force of the outer vane portion 21e, and finally is discharged to the heat exchanger via the discharge side joint member 2.

[0069] <Regarding the stator assembly>

[0070] Thus, return to the description of the stator assembly 50 of the present embodiment using Figure 1 and Figure 2 . As Figure 1 shown, the stator assembly 50 includes a stator 60, a substrate 70, a coil cover 80, and a coil housing 90.

[0071] <Regarding the stator>

[0072] As Figure 4 and Figure 5 shown, the stator 60 includes: a stator core 61 formed by laminating thin magnetic plates made of a magnetic material; a bobbin housing 62 made of an insulating material such as resin, covering a part of the stator core 61; and a plurality of coils 63 wound around the stator core 61 with the bobbin housing 62 interposed therebetween. The bobbin housing 62 has a rectangular outer shape, and has support portions 62b provided at respective corners, cutout portions 62ba provided in the support portions 62b and through which the fastening member 8 is inserted, and a plurality of terminal pins 64 disposed on the inner peripheral side of the support portions 62b and electrically connected to the ends of the coils 63 (refer to Figure 5 ).

[0073] <Regarding the substrate>

[0074] As Figure 4 and Figure 5 shown, the substrate 70 has a substantially rectangular shape, controls the drive signal to the coil 63, and has an opening 70a centered on the axis L, cutout portions 70b provided at respective corners and through which the fastening member 8 is inserted when viewed from the axis L direction, and a plurality of pin holes 70h disposed on the inner peripheral side of the cutout portions 70b. Further, as Figure 5 shown, a connector 70c having a cable 70d for power supply terminals for supplying power to the substrate 70 is connected to the other side surface of the substrate 70.

[0075] <Regarding the coil cover>

[0076] As Figure 4 shown, in order to prevent foreign substances such as physical contact and dust from adhering to the coil 63, the coil cover 80 covers at least a part of one side surface of the coil 63 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 compared to the case of resin molding one side of the coil 63.

[0077] <Regarding the coil housing>

[0078] As Figure 5 shown, the coil housing 90 covers the other side surface of the coil 63 in order to prevent foreign substances such as physical contact and dust from adhering to the coil 63 and is made of a resin material. The coil housing 90 has a substantially rectangular shape and includes: a coil housing bottom 90a (the other side portion of the coil housing), which is formed with an opening 90aa centered on the axis L and a connector insertion hole 90ab; a coil housing side portion 90b, which stands up from the peripheral portion of the coil housing bottom 90a; a bobbin housing receiving portion 90c, which is provided at each corner of the coil housing bottom 90a; and a fastening hole 90ca, which is formed in the bobbin housing receiving portion 90c and is screwed with the threaded portion 8a of the fastening member 8 (refer to Figure 10 ). In addition, as Figure 4 shown, the coil housing side portion 90b of the coil housing 90 has a cable cutout portion 90ba through which a cable 70d (refer to Figure 5 ) can be inserted between the drooping wall 80f of the coil cover 80 (refer to Figure 2 ). In addition, in the present embodiment, the coil housing 90 is adopted, but the coil housing 90 is not an essential structure. For example, the other side of the stator 60 can also be resin molded, and a structure corresponding to the bobbin housing receiving portion 90c and the fastening hole 90ca of the present embodiment can be provided.

[0079] <Regarding the bracket>

[0080] As Figure 4 shown, the bracket 5 includes: a top plate 5b, which has an outer shape with a substantially rectangular shape and has a U-shaped recess 5a corresponding to the shape of the raised portion 31e of the one-side main body housing 31 when viewed from the axis L direction; extending portions 5c, which extend from each corner of the top plate 5b toward the other side and the outer side in the radial direction; and fastening holes 5ca, which are formed in the extending portions 5c and through which the fastening member 8 is inserted.

[0081] Furthermore, in the present embodiment, as a means for fixing the rotor assembly 10 and the stator assembly 50 to each other in the axial L direction and the circumferential direction, a bracket 5 and a fastening component 8 are used, but this is not limited to this. For example, four L-shaped clips and fastening components, or other fixing components may also be used, which will be described in detail later.

[0082] <Detailed structure of coil cover>

[0083] like Figure 6 As shown in (a), the coil cover 80 has: a covering portion 80a, which has a generally rectangular shape and has an opening portion 80aa centered on the axis L; a carrier portion 80b, which is disposed radially outward of the covering portion 80a; a plurality of connecting portions 80c, which connect the covering portion 80a and the carrier portion 80b; and a fastening hole 80e, which is disposed at each corner for the fastening component 8 to be inserted. The plurality of connecting portions 80c extend from the outer peripheral edge of the covering portion 80a to the other side, and the carrier portion 80b extends radially outward from the other end of the connecting portion 80c. Thus, as Figure 1 As shown, in the assembled state of the rotor assembly 10 and the stator assembly 50, by arranging the other end of the outer peripheral side of the main body housing 30, that is, the other end of the side peripheral wall 31b and the outer peripheral flange 32a to face one side of the mounting portion 80b, space saving can be achieved in the direction of the axis L, which will be described in detail later. Figure 5 As shown, the coil cover 80 has a vertically drooping wall 80f provided from one side of the mounting portion 80b. In the coil cover 80, the outer peripheral opening 80d of the covering portion is defined by the covering portion 80a, a pair of adjacent connecting portions 80c, and the mounting portion 80b. Figure 8 As shown, the first wall portion 62a1 of the bobbin case 62 is inserted through the opening portion 80aa, and the second wall portion 62a2 of the bobbin case 62 having a corresponding shape is inserted through the cover outer peripheral opening 80d, which will be described in detail later.

[0084] (Variation of coil cover)

[0085] Among them, use Figure 6 (b) describes a modified example of the coil cover of the present embodiment. The shapes of the connecting portion 80c' and the mounting portion 80b' of the modified example of the coil cover are different from the shapes of the connecting portion 80c and the mounting portion 80b of the present embodiment, but the other basic structures are the same as those of the present embodiment. The same symbols are marked for the same structures, and repeated descriptions are omitted. In addition, Figure 6 (b) corresponds to Figure 6 (a).

[0086] like Figure 6As shown in (b) thereof, in the coil cover 80' in the deformed example of the coil cover, when viewed from the direction of the axis L, the connecting portion 80c', the mounting portion 80b', and the fastening hole 80e are provided in the same radial direction, and the outer peripheral opening portion 80d' of the covering portion is defined by the covering portion 80a and a pair of adjacent connecting portions 80c'. Thus, in the coil cover 80' in the deformed example of the coil cover, by simplifying the overall shape, cost reduction can be achieved. In addition, in the coil cover 80' in the deformed example of the coil cover, it is not necessary to make the shape of the outer peripheral opening portion 80d' of the covering portion coincide with the shape of the second wall portion 62a2 of the bobbin case 62, so the installation operation of the coil cover 80' and the bobbin case 62 can be smoothly performed.

[0087] In addition, in the coil cover 80 of the present embodiment and the coil cover 80' in the deformed example of the coil cover, they respectively have a covering portion 80a, connecting portions 80c, 80c', mounting portions 80b, 80b', and fastening holes 80e, but are not limited thereto. For example, the coil cover may be composed only of a covering portion having an annular shape.

[0088] <Regarding the detailed structure of the stator>

[0089] From here, return to use Figure 7 the description of the detailed structure (stator core 61, bobbin case 62, and coil 63) of the stator 60 of the present embodiment.

[0090] The stator core 61 is formed by laminating thin magnetic plates made of a magnetic material, and when viewed from the direction of the axis L, it has an outer peripheral ring portion (not shown) formed in a ring shape and a plurality of (for example, nine) salient pole portions (not shown) that project in a T shape at equal angular intervals in the circumferential direction from the outer peripheral ring portion toward the inner side in the radial direction. When viewed from the direction of the axis L, the outer peripheral ring portions are arranged on the same circle.

[0091] As Figure 7 shown in (b) thereof, when the coil 63 is wound around the stator core 61, in order to ensure the insulation between the stator core 61 and the coil 63, the bobbin case 62 is formed of an insulating material such as resin and is provided between the stator core 61 and the coil 63. The bobbin case 62 is composed of a bobbin case main body 62a that houses the stator core 61 and a support portion 62b that is clamped between the coil cover 80 and the coil case 90 as Figure 1 shown.

[0092] Specifically, the bobbin case 62 has: a plurality of first wall portions 62a1 that form a main body insertion through hole 62a1h for inserting the main body case 30; a plurality of second wall portions 62a2 that surround the coil 63 from the outer peripheral side; and a plurality of main body portions 62ab (refer to Figure 7 (b) thereof), which connect the first wall portions 62a1 and the second wall portions 62a2 for winding the coil 63.

[0093] The first wall portion 62a1 is formed corresponding to the front end positions of the respective salient pole portions of the stator core 61 and extends in one side and the other side respectively. In addition, as shown in Figure 7 (a) thereof, when viewed from the direction of the axis L, the inner peripheral surface of the first wall portion 62a1 is arranged on the same imaginary circle (refer to the dotted line in the figure) that defines the main body insertion through hole 62a1h.

[0094] As shown in Figure 4 and Figure 5 , the second wall portion 62a2 extends in one side and the other side respectively. In addition, as shown in Figure 7 (a) thereof, when viewed from the direction of the axis L, the inner peripheral surface 62a2i of the second wall portion 62a2 is arranged on the same circle. Among them, as shown in Figure 4 and Figure 7 (a) thereof, a plurality (for example, four) of the second wall portions 62a2 extending in one side are arranged discontinuously in the circumferential direction with a slit S therebetween. The slit S is formed at a position where the main body portion 62ab is not arranged on the inner side in the radial direction of the slit S, and when assembling the stator assembly 50, the connecting portion 80c of the coil cover 80 is inserted into the slit S. In addition, as shown in Figure 5 , a plurality of the second wall portions 62a2 extending in the other side are arranged evenly in the circumferential direction.

[0095] In addition, the case where the second wall portion 62a2 in the present embodiment is arranged on the same circle when viewed from the direction of the axis L has been described, but it is not limited thereto. For example, it may also be arranged to form the sides of a polygon when viewed from the direction of the axis L.

[0096] As shown in Figure 7 (b) thereof, when viewed from the direction orthogonal to the axis L, the main body portion 62ab is formed to surround a connecting portion (not shown) that connects the outer peripheral ring portion of the stator core 61 and the front end positions of the respective salient pole portions, and a coil 63 is wound around the main body portion 62ab. Thus, a plurality of coils 63 are arranged separately at a constant interval in the circumferential direction. In addition, as described above, since no slit S is formed on the outer peripheral side of the main body portion 62ab, the outer peripheral edge of the wound coil 63 is reliably guided into the inner peripheral surface 62a2i of the second wall portion 62a2 by the second wall portion 62a2. Thus, when assembling the stator assembly 50, it is possible to prevent the coil 63 from being damaged due to the contact between the connecting portion 80c of the coil cover 80 inserted into the slit S and the coil 63.

[0097] As shown in Figure 7As shown in FIG. (b), 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 axial direction of the axis L are formed at the other end portions of the first wall portion 62a1 and the second wall portion 62a2. When viewed from a direction orthogonal to the axis L, the substrate contact portion 62a1b of the first wall portion and the substrate contact portion 62a2b of the second wall portion are located on the same plane. In the present embodiment, substrate contact portions 62a1b and 62a2b are formed at any of the other end portions of the first wall portion 62a1 and the second wall portion 62a2, but it is not limited thereto. For example, as long as at least one of the other end portions of the first wall portion 62a1 and the second wall portion 62a2 forms a substrate contact portion.

[0098] <Regarding the assembly process of the stator assembly>

[0099] Use Figure 4 , Figure 5 , Figure 8 And Figure 9 The assembly process of the stator assembly 50 will be described. First, regarding the assembly process of the stator 60 and the substrate 70, a plurality of terminal pins 64 (refer to Figure 5 ) of the stator 60 are inserted into a plurality of pin holes 70h provided in the substrate 70 at corresponding positions, and in a state where the substrate contact portion 62a1b of the first wall portion and the substrate contact portion 62a2b of the second wall portion (refer to Figure 7 FIG. (b)) are in contact with the substrate 70, the terminal pins 64 are fixed to the substrate 70 by soldering.

[0100] Next, regarding the process of assembling the mutually fixed stator 60 and substrate 70 to the coil housing 90, as shown in Figure 5 , the connector 70c provided on the other side surface of the substrate 70 is inserted through the connector insertion hole 90ab, and as shown in Figure 4 , the support portions 62b provided at the four corners of the bobbin housing 62 are placed on the bobbin housing receiving portion 90c of the coil housing 90.

[0101] Finally, regarding the assembly process of the stator 60 placed on the coil housing 90 and the coil cover 80, a plurality of first wall portions 62a1 are respectively inserted into the opening portions 80aa of the coil cover 80, and the second wall portions 62a2 of the bobbin housing 62 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 mounted on one side surface of the support portion 62b of the bobbin housing 62, and the connecting portions 80c of the coil cover 80 are respectively inserted into the slits S provided at corresponding positions of the bobbin housing 62. In addition, at the same time, the drooping wall 80f (refer to Figure 5 ) of the bobbin housing 62 and the cable cutout portion 90ba (refer to Figure 4) is engaged on one side, thereby forming Figure 2 the cable insertion through-hole 9 shown in the figure, and the cable 70d is led out to the outside through the cable insertion through-hole 9.

[0102] <Regarding the existing problems 1 and 2 (difficulty in reducing the height of the sealed pump, insufficient coil cooling)>

[0103] As described above, in Figure 12 the existing sealed pump 1200 shown in the figure, a coil cover 1280 and a connection unit 1205 are sandwiched between the blade housing portion 1232b of the main body housing 1230 and the spool housing 1262, so there is the existing problem 1 (difficulty in reducing the height of the sealed pump). Furthermore, in the existing sealed pump 1200, since a coil cover 1280 and a connection unit 1205 are sandwiched between one side surface of the spool housing 1262 and the blade housing portion 1232b with a relatively high cooling effect, there is the existing problem 2 (insufficient coil cooling).

[0104] In contrast, in the present embodiment, as shown in Figure 8 and Figure 9 the stator assembly 50 is premised on having a detachable coil cover 80 disposed on one side of the coil 63. When viewed from a direction orthogonal to the axis L, the main body housing abutting portions 62a1a (refer to the dot pattern in the figure) of the first wall portion and the main body housing abutting portions 62a2a (refer to the grid pattern in the figure) of the second wall portion are disposed on one side with respect to one side surface of the covering portion 80a of the coil cover 80. Thus, in the assembly process of the rotor assembly 10 and the stator assembly 50, the main body housing abutting portions 62a1a and 62a2a, which are one side surface of the spool housing 62, can directly abut against the main body housing 30 in the direction of the axis L, and the existing problem 1 (difficulty in reducing the height of the sealed pump) and the existing problem 2 (insufficient coil cooling) can be eliminated simultaneously, saving space and improving reliability. In addition, in the assembled state of the rotor assembly 10 and the stator assembly 50, the main body housing abutting portions 62a1a of the first wall portion and the main body housing abutting portions 62a2a of the second wall portion form double concentric circles, so the rotor assembly 10 can be supported more stably.

[0105] <Regarding the assembly process of the rotor assembly and the stator assembly>

[0106] Use Figure 10 to describe the assembly process of the rotor assembly 10 and the stator assembly 50. First, in a state where the axes L of the rotor assembly 10 and the stator assembly 50 are aligned with each other, the rotor assembly 10 is moved closer to the other side of the axis L with respect to the stator assembly 50.

[0107] Then, insert the rotor magnet housing portion 32c of the rotor assembly 10 into the main body insertion hole 62a1h of the stator 60, and insert the shaft fixing member housing portion 32d of the rotor assembly 10 into the opening 70a of the substrate 70 and the opening 90aa of the coil housing 90.

[0108] Furthermore, by bringing the blade housing portion 32b of the rotor assembly 10 into contact with the main body housing contact portion 62a1a of the first wall portion (refer to the dot pattern in (a) and (b) of Figure 10 ), which is the axial direction positioning unit, and the main body housing contact portion 62a2a of the second wall portion (refer to the grid pattern in (a) and (b) of Figure 10 ), the rotor magnet 22 is disposed opposite to the inner peripheral side of the stator 60. At this time, as shown in Figure 1 , the other end portion on the outer peripheral side of the main body housing 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 the end surface of the mounting portion 80b. Therefore, only the main body housing contact portion 62a1a of the first wall portion (refer to the dot pattern in Figure 1 ) and the main body housing contact portion 62a2a of the second wall portion (refer to the grid pattern in Figure 1 ) can be in direct contact with the main body housing 30. In addition, by relatively rotating the rotor assembly 10 and the stator assembly 50, the pulling directions of the suction side joint member 1, the discharge side joint member 2, and the cable 70d can be freely selected.

[0109] Finally, by engaging the concave portion 5a of the bracket 5 with the raised portion 31e of the rotor assembly 10, the rotation of the rotor assembly 10 is stopped, and the threaded portions 8a of the fastening members 8 are respectively screwed into the fastening holes 90ca of the coil housing 90 through the fastening holes 5ca of the bracket 5, the fastening holes 80e of the coil cover 80, and the cutout portion 62ba of the stator 60, and fixed in the axial direction of the axis L. In addition, by forming the opening 90aa in the coil housing 90, in the assembled state of the rotor assembly 10 and the stator assembly 50, the shaft fixing member housing portion 32d (the other end portion of the main body housing) of the rotor assembly 10 can be lowered to a position where it interferes with the bottom 90a of the coil housing.

[0110] In summary, the rotor assembly 10 and the stator assembly 50 are configured to be mutually detachable and attachable in the axial direction of the axis L via the bracket 5 and the fastening members 8.

[0111] <Regarding the axial direction positioning unit>

[0112] As shown in Figure 8 and Figure 9As shown, the axial direction positioning units of the present embodiment are the main housing abutting portions 62a1a of the first wall portion and the main housing abutting portions 62a2a of the second wall portion. During the assembly process of the aforementioned rotor assembly 10 and stator assembly 50, the blade receiving portion 32b of the main housing 30 directly abuts against the main housing abutting portions 62a1a (refer to the dot pattern in the figure) of the first wall portion formed in a plurality along the circumferential direction and the main housing abutting portions 62a2a (refer to the grid pattern in the figure) of the second wall portion in the axial direction of the axis L. Thus, there is no interposition between the blade receiving portion 32b of the main housing 30 and the spool housing 62, so space saving in the axial direction of the axis L can be achieved. In addition, since the blade receiving portion 32b with a relatively high cooling effect directly abuts against the spool housing 62 wound with the coil 63, the existing problem point 1 (difficulty in reducing the height of the seal pump) and the existing problem point 2 (insufficient cooling of the coil) can be eliminated simultaneously. Furthermore, in the present embodiment, in the assembled state of the rotor assembly 10 and the stator assembly 50, the respective main housing abutting portions 62a1a, 62a2a serve as acting points, and the stator core 61 with relatively high rigidity is arranged on the acting force line extending from the respective main housing abutting portions 62a1a, 62a2a toward the other side. Therefore, the deformation amount in the axial direction of the axis L is also relatively small, and the fastening in the axial direction of the axis L can be more firmly performed.

[0113] <Regarding concerns (difficulty in balancing insulation of the coil and low height)>

[0114] In the present embodiment, by directly abutting the main housing abutting portions 62a1a of the first wall portion and the main housing abutting portions 62a2a of the second wall portion, which are the axial direction positioning units, against the blade receiving portion 32b of the main housing 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 achieved simultaneously.

[0115] Among them, as Figure 9 shown, the coil 63 and the covering portion 80a are housed in the main body portion 62ab in such a manner as not to protrude from one side of the first wall portion 62a1 and the second wall portion 62a2. At this time, it is desired that the gap B required for insulating the coil 63 from the main housing 30 is greater than the required value. On the other hand, if the gap B required for insulating the coil 63 from the main housing 30 is too large, it may be difficult to reduce the height of the seal pump 100 itself (hereinafter referred to as "concern (difficulty in balancing insulation of the coil and low height)").

[0116] In contrast, in the present embodiment, by designing the one - side extension amount Lex of the main housing abutting portions 62a1a, 62a2a to satisfy the following (Equation 3), the insulation between the coil 63 and the main housing 30 can be reliably maintained, and the height reduction of the seal pump 100 itself can be further achieved.

[0117] Specifically, the clearance B required for insulating the coil 63 from the main body housing 30 is preferably set to be larger than the thickness C of the main body portion 62ab that has been subjected to the insulation treatment (C < B). In addition, in order to prevent the clearance B required for insulating the coil 63 from the main body housing 30 from becoming large, it is preferably set to be smaller than the sum of the thickness C of the main 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).

[0118] C < B < C + T (Equation 1)

[0119] Wherein, when the thickness A of the wound coil 63 is added to each side of the inequality in (Equation 1), then

[0120] A + C < A + B < A + C + T (Equation 2).

[0121] The central side A + B in this (Equation 2) represents the one - side extension amount Lex of the main body housing contact portions 62a1a, 62a2a. Therefore, (Equation 2) can be expressed as the following (Equation 3) using the one - side extension amount Lex of the main body housing contact portions 62a1a, 62a2a.

[0122] A + C < Lex < A + C + T (Equation 3)

[0123] By designing the one - side extension amount Lex of the main body housing contact portions 62a1a, 62a2a in a manner that satisfies this (Equation 3), concerns (difficulty in achieving both coil insulation and low - height design) can be eliminated.

[0124] In addition, the main body housing contact portions 62a1a, 62a2a of the present embodiment are provided on one side with respect to one surface of the covering portion 80a of the coil cover 80, but it is not limited thereto. For example, they can also be provided on the same surface with respect to one surface of the covering portion 80a of the coil cover 80. Thus, in the assembled state of the rotor assembly 10 and the stator assembly 50, the contact area between the blade accommodating portion 32b with a relatively high cooling effect and the stator assembly 50 can be increased. Therefore, the existing problem point 2 (insufficient coil cooling) can be further reliably eliminated, and the rotor assembly 10 can be supported more stably.

[0125] In addition, in the present embodiment, the coil cover 80 covers a part of one surface of the coil 63, so the circulation of air on one side of the coil 63 can be allowed. Therefore, the air heated by the heat of the coil 63 rises due to the buoyancy effect and can dissipate heat smoothly to the blade accommodating portion 32b with a relatively high cooling effect. In addition, in the present embodiment, the coil cover 80 covers a part of one surface of the coil 63, but it is not limited thereto. For example, the coil cover 80 can also cover the entire one surface of the coil 63, thereby improving the protection effect of the coil 63.

[0126] (Deformation example of the main body housing contact portion)

[0127] Among them, use Figure 11 To describe deformation examples 1 to 4 of the main body housing contact portion of the present embodiment. First, the differences between deformation examples 1 and 2 of the main body housing contact portion and the present embodiment are that only one of the end portions of the first wall portion 62a1 and the end portions of the second wall portion 62a2 becomes the main body housing contact portion, and the other basic structures are the same as those of the present embodiment. In addition, the difference between deformation example 3 of the main body housing contact portion and the present embodiment is that one end portion of the protruding portion 62a3”’ becomes the main body housing contact portion, and the other basic structures are the same as those of the present embodiment. Furthermore, the difference between deformation example 4 of the main body housing contact portion and the present embodiment is that the covering portion 80a”’ and the placing portion 80b are formed in a plate shape, and the other basic structures are the same as those of the present embodiment.

[0128] (Deformation example 1 of the main body housing contact portion)

[0129] Use Figure 11 Of (a), to describe one end portion of the first wall portion 62a1 and one end portion of the second wall portion 62a2’ in deformation example 1 of the main body housing contact portion of the present embodiment. In this deformation example 1 of the main body housing contact portion, when viewed from a direction orthogonal to the axis L, one end portion of the first wall portion 62a1 is provided on one side with respect to one end portion of the second wall portion 62a2’ and one side surface of the covering portion 80a of the coil cover 80. Thus, in deformation example 1 of the main body housing contact portion, only one end portion of the first wall portion 62a1 becomes the main body housing contact portion 62a1a. Therefore, it is not necessary to process one end portion of the first wall portion 62a1 and one 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.

[0130] (Deformation example 2 of the main body housing contact portion)

[0131] Use Figure 11(b) will describe one end of the first wall portion 62a1” and one end of the second wall portion 62a2 in the deformation example 2 of the main body housing abutting portion of the present embodiment. In this deformation example 2 of the main body housing abutting portion, when viewed from a direction orthogonal to the axis L, one end of the second wall portion 62a2 is disposed 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. Thus, in the deformation example 2 of the main body housing abutting portion, only one end of the second wall portion 62a2 becomes the main body housing abutting portion 62a2a. Therefore, similar to the deformation example 1 of the main body housing abutting portion, cost reduction of the stator 60” can be achieved. In addition, the main body housing abutting portion 62a2a of the deformation example 2 of the main body housing abutting portion is located on the outer peripheral side of the axis L compared with the main body housing abutting portion 62a1a of the deformation example 1 of the main body housing abutting portion, and the abutting area can be increased. Therefore, the rotor assembly 10 can be supported more stably.

[0132] (Deformation example 3 of the main body housing abutting portion)

[0133] Use Figure 11 (c) will describe one end of the protruding portion 62a3”’ in the deformation example 3 of the main body housing abutting portion of the present embodiment. In this deformation example 3 of the main body housing abutting 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 in the same plane. In addition, when viewed from a direction orthogonal to the axis L, one end of the protruding portion 62a3”’ provided on the bobbin housing main body 62a (refer to Figure 7 (b)) is disposed 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”’. Thus, the main body housing abutting portion 62a3a”’ of the deformation example 3 of the main body housing abutting portion is located on the outer peripheral side of the axis L compared with the main body housing abutting portion 62a2a of the deformation example 2 of the main body housing abutting portion, and the abutting area can be further increased. Therefore, the rotor assembly 10 can be supported more stably.

[0134] (Deformation example 4 of the main body housing abutting portion)

[0135] Use Figure 11(d) describes one end of the first wall portion 62a1 and one end of the second wall portion 62a2 in the fourth modification of the main body housing contact portion of the present embodiment. In the fourth modification of the main body housing contact portion, when viewed from a direction orthogonal to the axis L, one end of the first wall portion 62a1 and one end of 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 housing contact portion, the coil cover 80"" includes the periphery of the fastening hole 80e, and the covering portion 80a"' and the mounting portion 80b are formed of a plate-like member having the same wall thickness, so that cost reduction of the coil cover 80"" can be achieved.

[0136] In addition, in the fourth modification of the main body housing contact portion of the present embodiment, one end of the first wall portion 62a1 and one end of the second wall portion 62a2 respectively become the main body housing contact portions 62a1a and 62a2a, but it is not limited thereto. For example, only one of one end of the first wall portion 62a1 and one end of the second wall portion 62a2 may become the main body housing contact portion. Further, in the fourth modification of the main body housing contact portion of the present embodiment, when viewed from a 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, but it is not limited thereto. For example, one side surface of the covering portion 80a"' may be provided at a position on the other side with respect to one side surface of the mounting portion 80b.

[0137] Furthermore, in the present embodiment and the first to fourth modifications of the main body housing contact portion, the case where one end surface of the bobbin housing 62 becomes the main body housing contact portion has been described in all cases. However, the main body housing contact portion does not need to be one end surface of the bobbin housing 62, and it is sufficient that it directly contacts the main body housing 30. Therefore, for example, the main body housing 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 housing contact portion, the covering portion 80a is disposed at a position on one side with respect to the mounting portion 80b. Further, in the coil covers 80"' and 80"" of the third and fourth modifications of the main body housing contact portion, the covering portion 80a"' and the mounting portion 80b are provided on the same plane, but it is not limited thereto. For example, the covering portion may be disposed at a position on the other side with respect to the mounting portion.

[0138] <Regarding concerns (the overall height of the stator assembly based on the connector is large)>

[0139] In the present embodiment, as Figure 2As shown, by directly abutting the main housing abutting portions 62a1a of the first wall portion and 62a2a of the second wall portion, which are axial direction positioning units, against the blade accommodating portion 32b of the main housing 30 in the axial direction L of the axis, it is possible to particularly reduce the height on one side of the stator assembly 50. However, when a connector 70c for power supply terminals for supplying power to the substrate 70 is provided on the other side of the stator assembly 50, that is, on the other side surface of the substrate 70, it is necessary to separate the connector 70c in the axial direction L so as not to contact the bottom portion 90a of the coil housing. Therefore, there is a concern that the overall height h of the stator assembly 50 may increase (hereinafter referred to as "concern (large overall height of the stator assembly due to the connector)").

[0140] In contrast, in the present embodiment, by forming a connector insertion hole 90ab in the coil housing 90 and inserting the connector 70c through the connector insertion hole 90ab, it is possible to reduce the overall height h of the stator assembly 50 to a position where the connector 70c originally interfered with the bottom portion 90a of the coil housing in a manner that satisfies the following (Equation 4).

[0141] Specifically, the overall height h of the stator assembly 50 is preferably set 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 housing (h < a + b + c + d). Among them, in order to avoid interference between the connector 70c and the bottom portion 90a of the coil housing, a connector insertion hole 90ab is formed in the coil housing 90, and the connector 70c is inserted through the connector insertion hole 90ab. As a result, the overall height h of the stator assembly 50 is shortened by the amount of the thickness d of the bottom portion 90a of the coil housing, 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).

[0142] a + b + c < h < a + b + c + d (Equation 4)

[0143] Therefore, by forming the connector insertion hole 90ab in the coil housing 90, the overall height h of the stator assembly 50 can satisfy this (Equation 4), and thus the concern (large overall height of the stator assembly due to the connector) can be eliminated.

[0144] In addition, in the present embodiment, a case is shown where the connector 70c forms a connector insertion through hole 90ab to avoid interference with the bottom portion 90a of the coil housing, but it is not limited thereto. For example, instead of the connector insertion through hole 90ab, a thin wall portion may be formed at the bottom portion 90a of the coil housing, or in order to avoid interference with the terminal pins 64 and electronic components mounted on the other side surface of the substrate 70, other insertion through holes for the electronic components may be further formed in the coil housing 90.

[0145] In addition, regarding the overall height h of the stator assembly 50 of the present embodiment, as Figure 2 shown, a case where a connector 70c for power supply terminals for supplying power to the substrate 70 is adopted on the other side surface of the substrate 70 has been studied. In addition, when the connector 70c is adopted on one side surface of the substrate 70, it is necessary to arrange the connector 70c on the outer peripheral side of the stator core 61. Therefore, the dimension of the stator assembly 50 in the direction orthogonal to the axis L increases, and moreover, the terminal pins 64 and electronic components (not shown) are still mounted on the other side surface of the substrate 70. Therefore, it is difficult to significantly reduce the overall height h of the stator assembly 50. For this reason, in the present embodiment, the connector 70c is adopted on the other side surface of the substrate 70.

[0146] In summary, in the present embodiment, a detachable coil cover 80 is arranged on one side of the coil 63, and one side surfaces (main body housing abutting portions 62a1a, 62a2a) of the spool housing 62 serving as the axial direction positioning unit are directly abutted against the main body housing 30 in the axial direction of the axis L. As a result, the existing problem point 1 (difficulty in reducing the height of the hermetic pump) and the existing problem point 2 (insufficient coil cooling) can be eliminated simultaneously, space can be saved, and reliability can be improved.

[0147] In addition, in the present embodiment, the coil cover 80 covers a part of one side surface of the coil 63, and the axial direction positioning unit is the main body housing abutting portion 62a1a of the first wall portion and the main body housing abutting portion 62a2a of the second wall portion. When viewed from the direction orthogonal to the axis L, the main body housing abutting portions 62a1a, 62a2a are arranged on one side with respect to the one side surface of the coil cover 80 adjacent to the main body housing abutting portion. However, it is not limited thereto. If the coil cover 80 covers at least a part (including all) of one side surface of the coil 63, and one side surface of the spool housing 62 of the main body housing abutting portion of the axial direction positioning unit is directly abutted against the main body housing 30 in the axial direction of the axis L, and when viewed from the direction orthogonal to the axis L, it is arranged on the same surface or one side (such as modification examples 1 to 4 of the main body housing abutting portion) with respect to the one side surface of the coil cover 80 adjacent to the main body housing abutting portion, then similar to the present embodiment, the existing problem point 1 (difficulty in reducing the height of the hermetic pump) and the existing problem point 2 (insufficient coil cooling) can be eliminated simultaneously, space can be saved, and reliability can be improved.

[0148] In addition, in the present embodiment, in the assembled state of the rotor assembly 10 and the stator assembly 50, when the main body housing abutting portions 62a1a and 62a2a become the acting points, the stator core 61 with relatively high rigidity is arranged on the acting force line extending toward the other side from the main body housing abutting portions 62a1a and 62a2a, and the amount of deformation in the direction of the axis L is also relatively small, so that the fastening in the direction of the axis L can be more firmly performed. Furthermore, in the present embodiment, by designing the extension amount Lex on one side of the main body housing abutting portions 62a1a and 62a2a to satisfy the aforementioned (Equation 3): A + C < Lex < A + C + T, the concern (difficulty in achieving both insulation of the coil and low height) can be eliminated. In addition, in the present embodiment, by forming the connector insertion hole 90ab in the coil housing 90, the overall height h of the stator assembly 50 satisfies the aforementioned (Equation 4): a + b + c < h < a + b + c + d, so that the concern (large overall height of the stator assembly due to the connector) can be eliminated.

[0149] <Other>

[0150] The seal pump 100 of the present embodiment can of course be applied to all fluid devices and fluid circuits including refrigeration devices. Moreover, the present invention is not limited to the above-described embodiments, and appropriate changes and deformations can be made without departing from the technical idea of the present invention.

[0151] Symbol description

[0152] 100 - Sealed pump; 1 - Suction side joint component; 2 - Discharge side joint component; 5 - Bracket; 5a - Recess; 5b - Top plate; 5c - Protrusion; 5ca - Fastening hole; 6 - Thrust washer; 7 - Anti - detachment component; 8 - Fastening component; 8a - Threaded part; 9 - Cable insertion through - hole; 10 - Rotor assembly; 20 - Rotor; 21 - Impeller component; 21a - Bearing part; 21b - Base end part; 21c - Enlarged diameter part; 21d - Suction vane part; 21e - Outer vane part; 22 - Rotor magnet; 30 - Main body housing; 31 - One - side main body housing; 31a - Top wall; 31b - Side peripheral wall; 31c - One opening; 31d - Inner wall at the other end; 31e - Protrusion; 32 - The other - side main body housing; 32a - Outer peripheral flange; 32b - Vane storage part; 32c - Rotor magnet storage part; 32d - Shaft fixing component storage part; 41 - Shaft fixing component; 41a - Shaft hole; 42 - Fixed shaft; 43 - Vane housing; 43a - One side; 43aa - Opening; 43b - Leg; 43c - Side peripheral wall; 50 - Stator assembly; 60, 60’, 60” - Stator; 61 - Stator core; 62 - Bobbin housing; 62a - Bobbin housing main body; 62ab - Main body part; 62a1, 62a1”, 62a1”’ - First wall part; 62a1a - Main body housing abutting part of the first wall part (main body housing abutting part, axial direction positioning unit); 62a1b - Substrate abutting part of the first wall part; 62a1h - Main body insertion through - hole; 62a2, 62a2’, 62a2”’ - Second wall part; 62a2a - Main body housing abutting part of the second wall part (main body housing abutting part, axial direction positioning unit); 62a2b - Substrate abutting part of the second wall part; 62a2i - Inner peripheral surface; 62a3”’ - Protruding part (main body housing abutting part, axial direction positioning unit); 62b - Support part; 62ba - Cut - out part; 63 - Coil; 64 - Terminal pin; 70 - Substrate; 70a - Opening; 70b - Cut - out part; 70c - Connector; 70d - Cable; 70h - Pin hole; 80, 80’, 80”’, 80” - Coil cover; 80a, 80a”’ - Covering part; 80aa - Opening; 80b, 80b’ - Placing part; 80c, 80c’ - Connecting part; 80d, 80d’ - Outer peripheral opening of the covering part; 80e - Fastening hole; 80f - Hanging wall; 90 - Coil housing; 90a - Coil housing bottom (the other side part of the coil housing); 90aa - Opening; 90ab - Connector insertion through - hole; 90b - Coil housing side part; 90ba - Cable cut - out part; 90c - Bobbin housing 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 - Clearance required for insulation between the coil and the main body housing; c - Thickness of the connector; C - Thickness of the main body part; d - Thickness of the coil housing bottom; h - Overall height of the stator assembly; L - Axis;Lex—Extension amount on one side of the main body housing contact portion; S—Slit; S1—Radial fluid path; S2—Impeller accommodation space; T—Plate thickness of the coil cover.

Claims

1. A sealed pump, characterized in that, have: A rotor assembly comprises: a rotor having a rotor magnet disposed on an impeller member and rotating around an axis; and a main body housing accommodating the rotor; A stator assembly comprises: a stator, in which a coil is wound around a stator core via a bobbin case; and a coil cover, which is detachably disposed on one side of the coil and protects the coil; as well as An axial direction positioning unit is used for positioning the rotor assembly and the stator assembly in the axial direction in such a way that the rotor magnet is arranged on the inner side of the stator in the radial direction, in the rotor assembly and the stator assembly which can be installed and removed in the axial direction. The coil cover covers at least a portion of one side of the coil, and The axial direction positioning unit includes a main body housing abutment portion in which one side surface of the bobbin housing directly abuts against the main body housing in the axial direction. The main body case contact portion is provided on the same surface or on one side with respect to a side surface of the coil cover adjacent to the main body case contact portion when viewed from a direction perpendicular to the axis.

2. The sealed pump according to claim 1, characterized in that: The spool housing has: a first wall portion forming a main body insertion hole into which the main body housing is inserted; a second wall portion that surrounds the coil from an outer peripheral side; and a main body connecting the first wall portion and the second wall portion and having the coil wound therearound, The main body housing abutment portion is formed by the first wall portion.

3. The sealed pump according to claim 1, characterized in that: The spool housing has: a first wall portion forming a main body insertion hole into which the main body housing is inserted; a second wall portion that surrounds the coil from an outer peripheral side; and a main body connecting the first wall portion and the second wall portion and having the coil wound therearound, The main body housing abutment portion is formed by the second wall portion.

4. The sealed pump according to claim 1, characterized in that: The spool housing has: a first wall portion forming a main body insertion hole into which the main body housing is inserted; a second wall portion that surrounds the coil from an outer peripheral side; and a main body connecting the first wall portion and the second wall portion and having the coil wound therearound, The main body housing abutment portion is composed of the first wall portion and the second wall portion.

5. The sealed pump according to any one of claims 1, 3 and 4, characterized in that: The coil cover has: a covering portion covering at least a portion of a side surface of the coil; a mounting portion provided outside the covering portion in a radial direction and mounted on the stator; and a plurality of connecting parts connecting the covering part and the placing part, The main body housing abutment portion is inserted into at least a cover portion outer peripheral opening portion defined by the cover portion and a pair of adjacently disposed connection portions.

6. The sealed pump according to claim 5, characterized in that: The connecting portion extends from the outer periphery of the covering portion to the other side, The placement portion extends radially outward from the other end portion of the connection portion.

7. The sealed pump according to claim 3 or 4, characterized in that: The coil cover has: a covering portion covering at least a portion of a side surface of the coil; A placement portion, which is provided on the outer side in the radial direction of the covering portion and is placed on the stator; and A plurality of connecting portions, which connect the covering portion and the placement portion, A plurality of the main body housing abutting portions of the second wall portion are provided discontinuously in the circumferential direction with a slit therebetween, The slit is formed at a position where the main body portion is not arranged on the inner side in the radial direction of the slit, The connecting portion is inserted into the slit.

8. The sealed pump according to claim 1, characterized in that The stator assembly further includes a coil housing, which is arranged on the other side of the coil and protects the coil, A main body insertion hole is formed in the other side portion of the coil housing, With the other end portion of the main body housing inserted into the main body insertion hole, the other end portion of the main body housing does not protrude outward from the other side portion of the coil housing.

9. The sealed pump according to claim 1, characterized in that The stator assembly further includes: a substrate, which controls a drive signal for the coil; and a coil housing, which is arranged on the other side of the coil and protects the coil, One side surface of the substrate abuts against the stator, and a connector for a power supply terminal for supplying power 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 housing, With the connector inserted into the connector insertion hole, the other end portion of the connector does not protrude outward from the other side portion of the coil housing.

10. A cooling device, characterized in that It includes the sealed pump according to claim 1.

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