JP5113618B2 - Motor integrated pump - Google Patents

Description

  The present invention relates to a motor-integrated pump in which a pump unit is integrated with a motor unit.

  The motor-integrated pump is configured by integrally coupling a motor unit to a pump unit. In the pump unit, a separation plate (partition wall) is interposed between the rotor and the stator (stator), and resin is injected and fixed to the stator side of the separation plate.

At this time, it is known that a protrusion is provided that protrudes from the outer periphery of the separation plate into the resin, and the bonding strength between the separation plate and the resin is increased by the anchor effect of the protrusion (for example, a patent Reference 1).
JP 2006-67729 A (page 4, FIG. 2)

  However, in the conventional motor-integrated pump, the protrusion provided on the separation plate is protruded into the injected resin, but the protrusion is simply protruded from the outer periphery of the separation plate. The outer surface of the protruding portion is formed as a smooth surface like the surface of the separation plate. For this reason, the anchor effect by a projection part becomes small and there exists a possibility that the coupling strength of a separating plate and resin may become low.

  Then, an object of this invention is to obtain the motor integrated pump which can improve the joint strength of a separation plate and resin more.

According to the first aspect of the present invention, an annular stator wound with a coil, a control circuit for controlling energization of the coil, and a magnetic field generated in the coil that is rotatably arranged on the inner periphery of the stator A pump section having a motor section having a rotor that rotates at a rotor, an impeller provided on the rotor, and a pump casing that forms a pump chamber that houses the impeller, and between the stator and the rotor A separation plate formed by a bottomed cylindrical portion for partitioning, a flange portion for partitioning the stator and the pump chamber, and the stator and the control circuit on a side where the stator is disposed with respect to the separation plate a motor-integrated pump and a resin mold portion which was cured by injecting a molding material while buried, the upper notated flange portion, collision projecting into the interior of the resin mold portion The protrusion has a side wall, a tip wall, and a bottom wall, and a filling portion into which the molding material of the resin mold portion flows inwardly surrounded by the walls is provided. It is recessed and the opening side of the filling part is opened toward the radially outward direction of the motor part.

  The invention of claim 2 is characterized in that a plurality of the protrusions are provided.

  The invention according to claim 3 is characterized in that the plurality of protrusions are arranged at substantially equal intervals around the central axis of the motor unit.

In the invention of claim 4, an introduction hole is provided in the vicinity of the tip wall of the bottom wall on the bottom side of the filling portion to allow the molding material to pass through when filling the molding material. .

In the invention of claim 5, the outer peripheral portion of the upper Symbol flange portion, characterized in that was flared outwardly from the outer peripheral surface of the resin mold portion in contact with the flange portion.

According to the first aspect of the present invention, since the filling portion into which the mold material of the resin mold portion flows is recessed inwardly surrounded by the walls of the protruding portion , the mold material flowing into the filling portion is cured. As a result, the filling portion serves as a locking portion, and the anchor effect of the protrusion can be further increased, and the bonding strength between the separation plate and the resin mold portion can be further improved. In addition, since the filling portion is opened toward the outer diameter direction of the motor portion, the flowability of the molding material into the filling portion can be improved, and the anchor effect of the protrusion can be more reliably obtained.

  According to the second aspect of the present invention, it is possible to further improve the bonding strength between the separation plate and the resin mold portion by the anchor effect of the plurality of protrusions.

  According to the invention of claim 3, since the plurality of projections are arranged at substantially equal intervals around the central axis of the motor unit, the anchor effect of each projection can be applied substantially evenly around the separation plate. it can. Thereby, it can couple | bond with a resin mold part with the binding force substantially equal to the circumferential direction of a separating plate, and can aim at the further improvement of the joint strength of a separating plate and a resin mold part.

According to the invention of claim 4, the molding material can be injected into the filling portion more efficiently through the introduction hole provided in the vicinity of the tip wall of the bottom wall on the bottom side of the filling portion, and the introduction hole is used as an air vent. Can also be used. Thereby, the filling efficiency of the molding material into the filling portion can be increased, and the bonding strength between the protruding portion and the resin mold portion can be further increased.

According to the invention of claim 5 , since the outer peripheral portion of the flange portion of the separation plate is projected outward from the outer peripheral surface of the resin mold portion in contact with the flange portion, the injected mold material causes the flange portion to It can be prevented from getting over to the pump casing side. As a result, it is possible to prevent the molding material from adhering to the outer peripheral portion of the flange portion and the like from being deteriorated in appearance, and to prevent the molding material from entering between the pump casing and the flange portion. It is possible to suppress poor welding with the flange portion.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view of a motor-integrated pump, FIG. 2 is a plan view of a separation plate, FIG. 3 is a side view of the separation plate viewed from the direction III in FIG. 2, and FIG. FIG. 5 is an enlarged view, FIG. 5 is a main part sectional view taken along line VV in FIG. 4, and FIG. 6 is an enlarged sectional view of a VI part in FIG.

  As shown in FIG. 1, a motor-integrated pump (hereinafter simply referred to as a pump) 1 according to this embodiment is configured by integrally coupling a motor unit 2 and a pump unit 3.

  The motor unit 2 is an annular stator 22 around which the coil 21 is wound, a control circuit 23 that controls energization of the coil 21, and a magnetic field generated in the coil 21 that is rotatably arranged on the inner periphery of the stator 22. And a rotor 24 generally configured.

  The stator 22 has a stator core 22a that is formed in a generally annular shape by laminating thin plates of a magnetically sensitive material such as a steel plate, and protrudes at equal intervals in the circumferential direction on the inner peripheral side of the stator core 22a. The above-described coil 21 is wound around the tooth portion 22b with an insulating material 22c such as synthetic resin interposed.

  The control circuit 23 is disposed on the opposite side to the pump unit 3 with respect to the stator 22 and inserts and electrically connects the terminal pin 21a of the coil 21 projecting from the above-described insulating material 22c. It is held by a post 22d protruding from 22c. The control circuit 23 is embedded and fixed by a resin mold part 5 described later.

  The rotor 24 is formed of a magnet material into a thick cylindrical shape and is disposed on the inner peripheral portion of the stator 22, and the inner peripheral portion of the rotor 24 is rotatable to a support shaft 24 b disposed on the central axis C via a bearing 24 a. Supported by The support shaft 24b is made of ceramic.

  The pump unit 3 is generally configured to include an impeller 31 provided in the rotor 24 and a pump casing 33 in which a pump chamber 32 that houses the impeller 31 is formed.

  The impeller 31 includes a shroud 31a formed integrally with one end portion (upper end portion in the figure) of the rotor 24, and a plurality of radially projecting protrusions on the opposite surface (upper surface in the figure) of the motor portion 2 of the shroud 31a. Vane 31b.

  The pump casing 33 is disposed so as to cover one end side (the upper end side in the drawing) of the motor unit 2 while housing the impeller 31 in the pump chamber 32. A suction port 33 a communicating with the pump chamber 32 is formed at the center of the pump casing 33, and a discharge port 33 b is formed in the tangential direction of the inner periphery of the pump chamber 32. When the impeller 31 rotates, the fluid introduced into the pump chamber 32 from the suction port 33a is added with centrifugal force by the rotation of the impeller 31 and discharged from the discharge port 33b. That is, the pump unit 3 functions as a centrifugal pump.

  Separation plates 4 are provided between the stator 22 and the rotor 24 and between the stator 22 and the pump chamber 32 to partition the respective parts. And the resin mold part 5 which inject | emitted and hardened the molding material 51 is provided in the side by which the stator 22 is arrange | positioned with respect to this separating plate 4, embedding the stator 22 and the control circuit 23. FIG.

  Of course, when the mold material 51 is injected in a fluid state, a mold (not shown) is used. The stator 22, the control circuit 23, and the separation plate 4 are set in the mold, and the mold material 51 is injected and cured. By doing so, the resin mold part 5 is molded. Therefore, the stator 22 and the control circuit 23 are embedded in the resin mold part 5 and integrated with the separation plate 4.

  2 and 3, the separation plate 4 includes a bottomed tubular portion 41 that partitions the stator 22 and the rotor 24, a flange portion 42 that partitions the stator 22 and the pump chamber 32, Formed by.

  As shown in FIG. 1, the bottomed cylindrical portion 41 is arranged in such a posture that the opening 41 a side is the pump portion 3 side, and the rotor 24 and the support shaft 24 b are inserted through the opening 41 a. A minute gap is provided between the side wall 41b of the bottomed tubular portion 41 and the rotor 24 so that the rotor 24 can rotate. Further, a cylindrical bearing portion 43 that fits and supports one end portion (lower end portion in the figure) of the support shaft 24b is provided at the inner central portion of the bottom portion 41c of the bottomed tubular portion 41.

  An annular protrusion 42 a that fits closely to the inner periphery of the pump chamber 32 is formed on the surface of the flange portion 42 that faces the pump portion 3. The pump casing 33 is fitted on the annular protrusion 42a, and the radially outer side of the pump casing 33 is welded to the flange portion 42 and sealed. The pump casing 33 is integrally provided with a bearing portion 33c that is located at the center of the impeller 31 and that fits and supports the other end portion (the upper end portion in the figure) of the support shaft 24b.

  And the rotor 24 rotates centering on the spindle 24b which supported the both ends to the bearing parts 43 and 33c mentioned above, and the impeller 31 is rotated with the rotational force, and the fluid in the pump chamber 32 is moved. At this time, a part of the fluid introduced into the pump chamber 32 from the suction port 33 a passes through the inside of the rotor 24 and then flows to the outer peripheral portion of the pump chamber 32 through the gap between the rotor 24 and the side wall 41 b of the separation plate 4. Thus, the inner peripheral side of the stator 22 is cooled.

  Here, in this embodiment, when the molding material 51 is injected to mold the resin mold portion 5, the resin mold portion 5 is attached to the flange portion 42 of the separation plate 4 as shown in FIGS. 1 to 3. A protruding portion 6 protruding inside is provided, and a filling portion 61 into which the molding material 51 of the resin mold portion 5 flows is recessed in the protruding portion 6.

  That is, as shown in FIG. 2, the flange portion 42 of the separation plate 4 is formed in a substantially square shape, and a plurality of protrusions 6 are provided at four corners of the flange portion 42 (four in this embodiment). Is provided. In this manner, the plurality of protrusions 6 are provided at the four corners of the square flange portion 42, so that the plurality of protrusions 6 are arranged at substantially equal intervals around the central axis C of the motor portion 2.

  Further, the protruding portion 6 protrudes from the flange portion 42 substantially parallel to the central axis of the motor portion 2 and has a substantially U-shaped cross-sectional shape on the side where the motor portion 2 is disposed (downward in the drawing). That is, as shown in FIGS. 3 and 4, the protrusion 6 has both side walls 62, 63, a tip wall 64, and a bottom wall 65, and each of these walls 62, 63, 64, 65. The inside surrounded by the above is the filling portion 61 described above. As shown in FIG. 1, an opening 66 communicating with the filling portion 61 is formed at a portion where the protrusion 6 is coupled to the flange portion 42, and the opening 66 is formed by injection of the molding material 51. It is sometimes closed so that the molding material 51 does not escape from the opening 66.

  As shown in FIGS. 4 and 5, the mold material 51 passes through the protrusion 6 when the mold material 51 is filled in the vicinity of the tip wall 64 of the bottom wall 65 on the bottom side of the filling portion 61. An introduction hole 67 is provided. At this time, the filling portion 61 is arranged so that the open side thereof, that is, the side opposite to the bottom wall 65 is the radially outward direction of the motor portion 2.

  Furthermore, in this embodiment, as shown in FIG. 6, the outer peripheral portion 42 b of the flange portion 42 of the separation plate 4 is projected outward from the outer peripheral surface 5 a of the resin mold portion 5 in contact with the flange portion 42. It is.

  With the configuration described above, according to the pump 1 according to the present embodiment, the separation plate 4 is provided with the protrusion 6 that protrudes inside the resin mold portion 5. The bonding strength with the part 5 can be increased. At this time, in this embodiment, since the filling portion 61 into which the molding material 51 of the resin mold portion 5 flows is recessed in the protruding portion 6, the molding material 51 that has flowed into the filling portion 61 is cured, The filling part 61 becomes a locking part, and the anchor effect of the protrusion part 6 can be further enhanced, and the bonding strength between the separation plate 4 and the resin mold part 5 can be further improved.

  In addition, since a plurality of protrusions 6 are provided in the present embodiment, the bonding strength between the separation plate 4 and the resin mold part 5 can be further improved by the anchor effect of the plurality of protrusions 6.

  Further, the plurality of projections 6 are arranged at the four corners of the square flange portion 42 and are arranged at substantially equal intervals around the central axis C of the motor unit 2. The separation plate 4 can be made to act almost evenly. Thereby, it can couple | bond with the resin mold part 5 with the binding force substantially equal to the circumferential direction of the separating plate 4, and can aim at the further improvement of the joint strength of the separating plate 4 and the resin mold part 5. FIG.

  Furthermore, since the introduction hole 67 through which the molding material 51 passes is provided on the bottom side of the filling portion 61 formed in the protrusion 6, the molding material 51 can be efficiently injected into the filling portion 61 through the introduction hole 67. The introduction hole 67 can also be used as an air vent. Thereby, the filling efficiency of the molding material 51 into the filling portion 61 can be increased, and the bonding strength between the protruding portion 6 and the resin mold portion 5 can be further increased.

  Further, since the filling portion 61 is opened toward the radially outward direction of the motor portion 2, the resistance is reduced as compared with the case where the filling portion 61 is opened toward the radially inward direction, and the flowability of the molding material 51 into the filling portion 61 is improved. Therefore, the filling efficiency of the molding material 51 into the filling portion 61 is further increased, and the anchor effect of the protruding portion 6 can be further enhanced.

  Further, since the outer peripheral portion 42b of the flange portion 42 of the separation plate 4 is projected outward from the outer peripheral surface 5a of the resin mold portion 5 in contact with the flange portion 42, the injected mold material 51 is exposed to the flange portion 42. Can be prevented from flowing into the pump casing 33 side. Accordingly, it is possible to suppress the appearance of the molding material 51 from adhering to the outer peripheral portion 42b of the flange portion 42 and to prevent the molding material 51 from entering between the pump casing 33 and the flange portion 42. Thus, poor welding between the pump casing 33 and the flange portion 42 can be suppressed.

  7 and 8 show a modification of the above embodiment. FIG. 7 is an enlarged bottom view of the protrusion, and FIG. 8 is a lower perspective view of the protrusion.

  In other words, in the present modification, a plurality of (two in this embodiment) introduction holes 67A and 67B are provided in the protrusion 6. That is, even in the present modification, the introduction holes 67A and 67B are formed in the vicinity of the tip wall 64 of the bottom wall 65, and the two introduction holes 67A and 67A along the tip wall 64 are formed. 67B is also attached.

  Therefore, even in the present modification, the molding material 51 is actively flowed into the filling portion 61 through the two introduction holes 67A and 67B when the molding material 51 is injected.・ Effects can be achieved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, the shape of the protruding portion 6 can be any shape as long as the filling portion 61 is provided. Further, the formation positions of the introduction holes 67, 67A, 67B are not limited to the above-described embodiment and modification examples, and may be any part that allows the molding material 51 to flow into the filling part 61. 61 should just be a recessed shape into which the molding material 51 can flow. Furthermore, the pump unit 3 is not limited to a centrifugal pump, and may be a pump that is driven by the rotation of the rotor 24.

It is sectional drawing of the motor integrated pump concerning one Embodiment of this invention. It is a top view of the separation plate used for one embodiment of the present invention. It is the side view which looked at the separator plate used for one Embodiment of this invention from the III direction in FIG. FIG. 4 is an enlarged view of a portion IV in FIG. 3. It is principal part sectional drawing along the VV line in FIG. It is an expanded sectional view of the VI section in FIG. It is an enlarged bottom view of the projection part which shows the modification of one Embodiment of this invention. It is a lower perspective view of the projection part showing the modification of one embodiment of the present invention.

Explanation of symbols

1 Pump (motor integrated pump)
DESCRIPTION OF SYMBOLS 2 Motor part 21 Coil 22 Stator 23 Control circuit 24 Rotor 3 Pump part 31 Impeller 32 Pump chamber 33 Pump casing 4 Separating plate 42 Flange part 42b Outer peripheral part of flange part 5 Resin mold part 5a Outer peripheral surface of resin mold part 51 Mold material 6 Protruding part 61 Filling part 67, 67A, 67B Introduction hole C Center axis

Claims (5)

A motor unit having an annular stator around which a coil is wound, a control circuit that controls energization of the coil, and a rotor that is rotatably arranged on the inner periphery of the stator and rotates by a magnetic field generated in the coil. When,
A pump unit having an impeller provided on the rotor, and a pump casing forming a pump chamber for housing the impeller;
A separation plate formed by a bottomed cylindrical portion that partitions the stator and the rotor and a flange portion that partitions the stator and the pump chamber;
On the side where the stator is disposed with respect to the separation plate, a resin mold part in which a molding material is injected and cured while embedding the stator and the control circuit;
A motor-integrated pump comprising:
Before notated flange portion, provided with a protrusion protruding into the interior of the resin mold portion, said protrusions, and the side walls has a front end wall, a bottom wall, and surrounded by the walls A motor-integrated pump characterized in that a filling portion into which the molding material of the resin mold portion flows is recessed inwardly, and an opening side of the filling portion is opened in a radially outward direction of the motor portion.   The motor-integrated pump according to claim 1, wherein a plurality of the protrusions are provided.   3. The motor-integrated pump according to claim 2, wherein the plurality of protrusions are arranged at substantially equal intervals around the central axis of the motor unit. The introduction hole for allowing the molding material to pass when the molding material is filled is provided in the vicinity of the tip wall of the bottom wall on the bottom side of the filling portion. The motor-integrated pump described in 1. The outer periphery of the front-Symbol flange, according to any one of claims 1-4, characterized in that was flared outwardly from the outer circumferential surface of the resin mold portion in contact with the flange portion Motor integrated pump.

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