JP5750359B2 - Electric pump - Google Patents

Description

  The present invention relates to an electric pump.

  2. Description of the Related Art Conventionally, a rotary field motor in which a rotor magnet, a yoke made of laminated steel plates, and an impeller member are integrally molded with a resin material has been known (see, for example, Patent Document 1).

Japanese Patent No. 4715280

  However, in such a configuration, since each part is mounted in the mold and insert molding is performed, whether the injection pressure of the molten resin material and the filling state of the molten resin material at the time of molding or molding are sufficient. There has been a problem that management of such things becomes cumbersome. In particular, it is difficult to manage the positioning and centering of each component in the mold, and there is a problem that the shaft core between the components is shifted and the rotational vibration of the motor is increased.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to obtain an electric pump that can easily center each part in a mold.

  In order to achieve the above object, an electric pump according to claim 1 of the present invention includes a rotor magnet disposed on a circumference coaxial with a motor shaft, and an annular holder member for holding the rotor magnet And a boss part inserted through the holder member, a collar member formed on one end side of the boss part and supporting a flange part in the axial direction, and the boss A rotor assembly that includes a cylindrical member that is inserted into the boss portion from the other end side of the portion and into which the motor shaft is inserted, and a suction port and a discharge port, and the suction port And a pump housing having a pump chamber in communication with each of the discharge ports, a stator for forming a rotating magnetic field with respect to the rotor assembly, and a front in communication with the pump chamber. A motor chamber that rotatably accommodates the rotor assembly, a motor housing that holds the stator, an impeller member that is rotatably accommodated in the pump chamber, and in which the rotor assembly is integrated with a resin material; It is characterized by having.

  According to the first aspect of the present invention, the rotor assembly in which the rotor subassembly and the bearing member are assembled in advance to the collar member is integrated with the impeller member and the resin material. Therefore, it is only necessary to center the rotor assembly with respect to the impeller member in the mold, and it is easy to center each component (rotor subassembly, bearing member, collar member) constituting the rotor assembly and the impeller member. Can be.

  The electric pump according to claim 2 is the electric pump according to claim 1, wherein the rotor assembly is inserted into the impeller member so that an outer surface of the rotor assembly is covered with the resin material. It is characterized by being molded.

  According to the invention described in claim 2, the impeller assembly in which the rotor assembly is coupled to the impeller member can be easily manufactured with high accuracy.

  Moreover, the electric pump according to claim 3 is the electric pump according to claim 2, wherein the protruding portion protrudes in the radial direction on the outer peripheral surface on the other end side of the boss portion protruding from the holder member. The protrusion is embedded in the resin material during the insert molding.

  According to the invention described in claim 3, the rotor assembly can be firmly coupled to the impeller member.

  Moreover, the electric pump of Claim 4 is an electric pump of any one of Claims 1-3, Comprising: An engaging part is on the outer peripheral surface of the said boss | hub part which does not protrude from the said holder member. It is formed and the to-be-engaged part which the said engaging part engages is formed in the internal peripheral surface of the said holder member, It is characterized by the above-mentioned.

  According to the fourth aspect of the present invention, the holder member (rotor subassembly) and the collar member can be positioned in the circumferential direction.

  Moreover, the electric pump according to claim 5 is the electric pump according to any one of claims 1 to 4, wherein the cylindrical portion is at an upstream end portion in the insertion direction with respect to the boss portion. A locking portion protruding in the radial direction is provided, and the locking portion is locked to the other end portion of the boss portion.

  According to the fifth aspect of the present invention, the bearing member and the collar member can be positioned in the axial direction.

  Further, the electric pump according to claim 6 is the electric pump according to claim 5, wherein a convex portion protruding toward the boss portion side is formed in the locking portion, and the other end portion of the boss portion is formed. A concave portion into which the convex portion is fitted is formed.

  According to the sixth aspect of the present invention, the bearing member and the collar member can be positioned in the circumferential direction.

It is a sectional side view of the electric pump concerning this embodiment. It is a disassembled perspective view of an impeller member and a rotor assembly. It is a top view of a rotor assembly. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. It is a sectional side view of the impeller assembly by which the rotor assembly is insert-molded by the impeller member.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each drawing is an upward direction, and an axial direction of the electric pump 10 is a direction parallel to the vertical direction.

  As shown in FIG. 1, the electric pump 10 according to the present embodiment includes a pump housing 12, a motor housing 14, an end housing 16, an impeller member 18, a rotor assembly 20, a stator 22, and a motor shaft 24. And a drive circuit 26.

  The pump housing 12 has a concave pump chamber 28 that opens toward the motor housing 14 described later. The pump chamber 28 communicates with each of the suction port 30 and the discharge port 32 formed in the pump housing 12, and an inclined portion 34 is formed on the suction port 30 side in the pump chamber 28. The inclined portion 34 is formed to be inclined with respect to the radial direction of the pump chamber 28 so as to be directed toward the suction port 30 as it goes inward in the radial direction of the pump chamber 28.

  The motor housing 14 is provided side by side in the axial direction of the pump housing 12 and the electric pump 10, and is fixed to the pump housing 12. The motor housing 14 includes a motor chamber 36 extending along the axial direction of the electric pump 10 and a bottom portion 37 constituting the motor chamber 36. That is, the motor chamber 36 is open to the pump housing 12 side and communicates with the pump chamber 28.

  In addition, a cylindrical shaft support portion 38 that projects toward the opening side of the motor chamber 36 is integrally formed on the bottom portion 37 of the motor housing 14. The shaft support portion 38 supports the lower end portion of the motor shaft 24 by press-fitting or the like. Further, on the pump chamber 28 side of the motor chamber 36, a diameter-expanded portion 40 having a diameter larger than that of the motor chamber 36 is formed.

  The end housing 16 is disposed on the opposite side of the pump housing 12 with the motor housing 14 interposed therebetween, and is fixed to the motor housing 14. The end housing 16 forms a housing space 42 between the end housing 16 and the motor housing 14, and the drive circuit 26 is housed in the housing space 42. The drive circuit 26 is configured to supply current to a stator 22 described later.

  The impeller member 18 has a plurality of radially extending blades 44 (see FIG. 2) and is rotatably accommodated in the pump chamber 28. That is, as the impeller member 18 rotates, the impeller member 18 sucks fluid from the suction port 30 and transports it to the pump chamber 28, and discharges the fluid transported to the pump chamber 28 from the discharge port 32. . The impeller member 18 is integrated with the rotor assembly 20 with a resin material, which will be described in detail later.

  As shown in detail in FIGS. 2 to 4, the rotor assembly 20 is formed on a ring-shaped holder member 46 and on a circumference that is held by the holder member 46 and coaxial with the impeller member 18 and the motor shaft 24. A rotor subassembly 21 having a plurality of (for example, four) rotor magnets 48 arranged at equal intervals is provided. The rotor subassembly 21 including the holder member 46 and the rotor magnet 48 is rotatably accommodated in the motor chamber 36, and the holder member 46 has a function as a yoke in which magnetic steel plates are laminated.

  Further, on the inner peripheral surface of the through hole 46A formed in the axial center portion of the holder member 46, there are a plurality of engaging recesses 47 as engaged portions extending in the axial direction at equal intervals in the circumferential direction (for example, 4) are formed. An engaging convex portion 53 (described later) is engaged (fitted) with the engaging concave portion 47 as the boss portion 52 (described later) is inserted into the through hole 46A.

  In addition, the rotor assembly 20 has a cylindrical boss portion 52 inserted through the through hole 46A of the holder member 46 and an outer peripheral surface (outer wall surface) on the lower end (one end) side of the boss portion 52 radially outward. The collar member 50 is integrally formed so as to protrude and has an annular flange portion 54 that supports the holder member 46 from the lower side in the axial direction (positions in the axial direction with respect to the holder member 46).

  A plurality of (for example, four) engagement protrusions 53 are formed at equal intervals in the circumferential direction on the outer peripheral surface of the boss portion 52 that does not protrude from the holder member 46 as an engagement portion extending in the axial direction. Yes. By engaging (fitting) the engagement convex portion 53 of the collar member 50 with the engagement concave portion 47 of the holder member 46, the holder member 46 and the collar member 50 are positioned in the circumferential direction (circumferential direction). The relative rotation to is restricted).

  Further, a notch-shaped recess 55 is formed at the upper end (other end) of the boss 52. Two concave portions 55 are formed at positions facing each other, and each convex portion 59 in a bearing member 56 to be described later is fitted. As shown in FIG. 4, an annular protrusion 52 </ b> A projecting (projecting) radially outward is formed on the outer peripheral surface of the boss 52 that protrudes from the holder member 46 on the upper end (other end) side. Is formed.

  The rotor assembly 20 includes a bearing member 56 having a cylindrical portion 57 that is inserted into the boss portion 52 from the upper end (other end) side of the boss portion 52. The motor shaft 24 is inserted inside the cylindrical portion 57. That is, as a result, the rotor assembly 20 is rotatably supported by the motor shaft 24 via the bearing member 56.

  In addition, an annular locking portion 58 is formed at the upper end portion (upstream end portion in the insertion direction with respect to the boss portion 52) of the bearing member 56 (cylindrical portion 57). . Therefore, when the cylindrical portion 57 of the bearing member 56 is inserted inside the boss portion 52, the lower surface of the locking portion 58 comes into contact with the upper end portion (upper end surface) of the boss portion 52, and thereby the bearing member 56. Is locked to the collar member 50. That is, as a result, the bearing member 56 and the collar member 50 are positioned in the axial direction.

  Further, a convex portion 59 that protrudes downward (to the boss portion 52 side) is formed on the lower surface of the locking portion 58. Two convex portions 59 are formed at positions facing each other, and are respectively fitted to the concave portions 55 formed at the upper end portion of the collar member 50. As a result, the bearing member 56 and the collar member 50 are positioned in the circumferential direction (relative rotation in the circumferential direction is restricted).

  The stator 22 is provided outside the motor chamber 36 in the radial direction, and is held by the motor housing 14. The stator 22 forms a brushless motor together with the rotor assembly 20, and forms a rotating magnetic field with respect to the rotor assembly 20 when a current is supplied from the drive circuit 26.

  Further, the enlarged diameter portion 40 is formed with a facing surface 40A that is opposed to the axial end surface 18A on the motor chamber 36 side of the impeller member 18 with a gap in the axial direction, and the inclined portion 34 has an impeller member 18. An inclined surface 34 </ b> A that is opposed to the blade 44 with a gap is formed. And the outer peripheral surface 60A of the coating | coated part 60 mentioned later opposes the inner peripheral surface 36A of the motor chamber 36 with the clearance gap between radial directions. In addition, the clearance gap between these each surface is made into the micro clearance gap of 1.0 mm or less, for example.

  Here, as described above, the rotor assembly 20 and the impeller member 18 are integrated by a resin material such as PC or ABS. That is, by placing the rotor assembly 20 in a mold (not shown) and insert-molding the impeller member 18 so as to cover the outer surface thereof, the rotor assembly 20 is integrated with the impeller member 18 as shown in FIG. To be combined.

  That is, the outer surface of the rotor assembly 20 is covered with a cylindrical neck portion 45 formed as an axial center portion of the impeller member 18 and a covering portion 60 continuous from the neck portion 45. At this time, the protrusion 52 </ b> A of the collar member 50 is embedded in the inner wall of the neck 45 of the impeller member 18. Thus, the rotor assembly 20 and the impeller member 18 are firmly (reliably) coupled.

  Therefore, a current is supplied from the drive circuit 26 to the stator 22 and a rotating magnetic field is formed by the stator 22, whereby the rotor assembly 20 and the impeller member 18 are rotationally driven integrally. In FIG. 2, the impeller member 18 including the neck portion 45 and the covering portion 60 is shown.

  Further, by rotating the impeller member 18, a fluid (for example, a liquid such as water) is sucked from the suction port 30 and transferred to the pump chamber 28, and the fluid transferred to the pump chamber 28 is discharged from the discharge port 32. It is supposed to be discharged.

  Next, the operation (manufacturing method) of the electric pump 10 having the above configuration will be described.

  First, the rotor subassembly 21 is assembled by holding the rotor magnet 48 on the holder member 46. Then, the boss portion 52 of the collar member 50 is inserted into the through hole 46 </ b> A of the holder member 46. At this time, the engaging convex portion 53 formed on the outer peripheral surface of the boss portion 52 is inserted while being engaged (fitted) with the engaging concave portion 47 formed on the inner peripheral surface of the holder member 46. .

  Thereby, the collar member 50 cannot be rotated relative to the holder member 46 (rotor subassembly 21). That is, the holder member 46 (rotor subassembly 21) and the collar member 50 are positioned in the circumferential direction. Further, the collar member 50 is positioned in the axial direction with respect to the holder member 46 (rotor subassembly 21) by the upper surface of the flange portion 54 of the collar member 50 coming into contact with the lower surface of the holder member 46.

  Next, the cylindrical portion 57 of the bearing member 56 is inserted into the collar member 50 (light press fitting). Then, the lower surface of the locking portion 58 of the bearing member 56 contacts the upper end surface of the collar member 50, and the bearing member 56 is locked to the collar member 50. As a result, the bearing member 56 is positioned in the axial direction with respect to the collar member 50.

  At this time, the convex portions 59 formed on the lower surface of the locking portion 58 are fitted into the concave portions 55 formed on the upper end portion of the collar member 50. Thereby, the bearing member 56 cannot be rotated relative to the collar member 50. That is, the collar member 50 and the bearing member 56 are positioned in the circumferential direction.

  This state is shown in FIG. 4, and the rotor assembly 20 in which the rotor subassembly 21 and the bearing member 56 are centered with respect to the collar member 50 is assembled (rotor assembly assembling step). In this embodiment, the bearing member 56 is assembled after the collar member 50 is assembled to the holder member 46 (rotor subassembly 21). However, the assembly order is not particularly limited.

  Thus, when the rotor assembly 20 is completed, the rotor assembly 20 is fixed in a mold (not shown), and the impeller member 18 is molded with a resin material. At the same time, the rotor assembly 20 is insert-molded into the impeller member 18. At this time, the protrusion 52A of the collar member 50 is embedded (melt-bonded) in the inner wall of the neck portion 45 of the impeller member 18 to prevent the rotor assembly 20 from slipping in the axial direction with respect to the neck portion 45.

  That is, as shown in FIG. 5, the rotor assembly 20 is thus constituted by the impeller member 18 in which the rotor assembly 20 is centered and integrated, that is, the neck portion 45 of the impeller member 18 and the covering portion 60 continuous from the neck portion 45. The impeller assembly 62 in which the outer surface 20 is coated and the rotor assembly 20 and the impeller member 18 are firmly and firmly connected together is manufactured (molding step).

  After the impeller assembly 62 is manufactured in this manner, the lower end portion of the motor shaft 24 is supported by press fitting or the like on the shaft support portion 38 formed on the bottom portion 37 of the motor housing 14. That is, the impeller assembly 62 is assembled to the motor housing 14 so that the impeller assembly 62 can rotate in the motor chamber 36 (impeller assembly assembling step). Thereby, the electric pump 10 as shown in FIG. 1 is manufactured.

  As described above, according to the electric pump 10 according to the present embodiment, the impeller member 18, the rotor subassembly 21, and the bearing member can be obtained simply by centering the rotor assembly 20 with respect to the impeller member 18 in the mold. Centering between 56 and (collar member 50) can be performed.

  Therefore, compared with a configuration in which the rotor assembly 20 in which the rotor subassembly 21 and the bearing member 56 are assembled in advance to the collar member 50 is not insert-molded in the impeller member 18, these components (the rotor subassembly 21, the bearing member 56, the collar Centering between the member 50) and the impeller member 18 can be easily and accurately performed.

  Further, since it is only necessary to insert-mold the rotor assembly 20 to the impeller member 18, the impeller assembly 62 in which the rotor assembly 20 is coupled to the impeller member 18 can be easily manufactured with high accuracy. In addition, since a mold for complicated injection molding is not necessary, the manufacturing cost is low.

  As mentioned above, although the electric pump 10 which concerns on this embodiment was demonstrated based on drawing, the electric pump 10 which concerns on this embodiment is not limited to the thing of illustration, and within the range which does not deviate from the summary of this invention. The design can be changed as appropriate. For example, the convex portion 59 and the concave portion 55 may be formed one by one.

DESCRIPTION OF SYMBOLS 10 ... Electric pump, 12 ... Pump housing, 14 ... Motor housing, 16 ... End housing, 18 ... Impeller member, 20 ... Rotor assembly, 21 ... Rotor subassembly, 22 ... Stator, 24 ... Motor shaft, 28 ... Pump chamber, 30 ... Suction port, 32 ... Discharge port, 36 ... Motor chamber, 46 ... Holder member, 48 ..Rotor magnet, 50 ... collar member, 52 ... boss portion, 54 ... flange portion, 56 ... bearing member, 57 ... cylindrical portion

Claims (6)

A rotor subassembly having a rotor magnet disposed on a circumference coaxial with the motor shaft, and an annular holder member for holding the rotor magnet;
A collar member having a boss portion inserted through the holder member and a flange portion formed on one end side of the boss portion and supporting the holder member in the axial direction;
From the other end side of the boss part, a bearing member having a cylindrical part inserted into the boss part and through which the motor shaft is inserted;
A rotor assembly comprising:
A pump housing having a suction port and a discharge port, and a pump chamber communicating with each of the suction port and the discharge port;
A stator that forms a rotating magnetic field with respect to the rotor assembly;
A motor housing that communicates with the pump chamber and rotatably accommodates the rotor assembly; and a motor housing that holds the stator;
An impeller member that is rotatably accommodated in the pump chamber and in which the rotor assembly is integrated with a resin material;
An electric pump characterized by comprising:   The electric pump according to claim 1, wherein the rotor assembly is insert-molded on the impeller member so that an outer surface of the rotor assembly is covered with the resin material. A protruding portion protruding in the radial direction is formed on the outer peripheral surface of the other end portion side of the boss portion protruding from the holder member,
The electric pump according to claim 2, wherein the protrusion is embedded in the resin material during the insert molding.   An engaging portion is formed on the outer peripheral surface of the boss portion that does not protrude from the holder member, and an engaged portion that engages with the engaging portion is formed on the inner peripheral surface of the holder member. The electric pump according to any one of claims 1 to 3. The cylindrical portion includes a locking portion protruding in a radial direction at an upstream end portion in an insertion direction with respect to the boss portion,
The electric pump according to any one of claims 1 to 4, wherein the locking portion is locked to the other end portion of the boss portion.   The convex part which protrudes to the said boss | hub part side is formed in the said latching | locking part, and the recessed part by which the said convex part is fitted is formed in the other end part of the said boss | hub part. Electric pump.

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