JP5065997B2 - pump - Google Patents

Description

  The present invention relates to a pump.

  Conventionally, a stator that generates a magnetic field, a control board that controls the stator, a rotor that is driven by a magnetic field generated by the stator, an impeller that absorbs and discharges liquid such as water fixed to the rotor, and the stator and the rotor are isolated. In the pump constituted by the separation plate, the stator and the control board form a stator completed by conducting and joining using a carrag terminal or the like.

  Furthermore, in order to prevent water intrusion due to water leakage and the like, corrosion due to high humidity installation environment, reduction of noise vibration, and efficient heat dissipation of electronic parts, the above-mentioned stator completion and separation plate are integrated with resin. It is. In this structure, the stator is completed and the separation plate is resin-molded. The resin molding is performed by so-called injection molding in which the stator completion and separation plate are placed in a mold and formed by a mold resin injected from a gate provided in the mold (for example, Patent Document 1).

  The configuration of a conventional pump will be described with reference to FIGS. The conventional pump absorbs and discharges a liquid such as a stator 1 that generates a magnetic field, a control board 4 that controls the stator 1, a rotor 22 that is driven by the magnetic field generated by the stator 1, and water fixed to the rotor 22. And the separation plate 3 that separates the stator 1 and the rotor 22 from each other.

  The stator 1 is generally formed by laminating electromagnetic steel sheets of 0.3 to 0.5 mm. For this reason, the thickness variation of the laminated electrical steel sheets is large, and the thickness of the stator 1 is expected to be about ± 0.5 mm. The stator 1 is provided with a first insulating plate 13 and a second insulating plate 14 made of resin for insulation from the copper wire 12 serving as a coil. The copper wire 12 is wound around the teeth 15 from above the stator 1 insulated by the insulating plates 13 and 14 to form a coil.

  In the case of a three-phase motor, the teeth inner peripheral surface 151 has a concentric shape with respect to the cylindrical outer peripheral surface 31 of the separation plate 3, but in the case of a single-phase motor, in order to determine the rotation direction of the impeller 21 In addition, a settling 152 is provided on the inner peripheral surface 151 of the tooth. For this reason, the teeth inner peripheral surface 151 is not installed in a concentric shape with respect to the cylindrical outer peripheral surface 31 of the separation plate 3, and is substantially wedge-shaped having an acute angle on one side in the circumferential direction as shown in FIG. 7. The space 5 is provided. Hereinafter, the description of the conventional pump will be based on the case of a three-phase motor, and the difference from a single-layer motor will be described in a timely manner.

  The first insulating plate 13 is provided with a carage terminal 41. On the carragage terminal 41, the winding start and the winding end of the copper wire 12 wound around the stator 1 are respectively wound and connected and fixed. Further, the stator 1 is electrically connected and joined to the control board 4 via the carrag terminals 41.

  The control board 4 includes a connector 42 for supplying power and electronic components constituting a drive circuit, and controls coil energization. A control board support 131 is provided from the first insulating plate 13 toward the control board 4 at a position on the back side of the control board 4 provided with the connector 42.

  In an electronic component constituting the drive circuit, a Hall IC 43 is provided in the vicinity of the cylindrical outer peripheral surface 31 of the separation plate 3. The Hall IC 43 detects the position of the rotor 22 from the polarity and strength of the magnetic force of the rotor 22 and generates a signal. The coil energization is controlled by feeding back the signal generated from the Hall IC 43 to the electronic component.

  For this reason, in order to correctly detect the position of the rotor 22, the Hall IC 43 needs to be installed at an optimum angle with respect to the center of the teeth inner peripheral surface 151 of the stator 1. If the angle of the Hall IC 43 is deviated, the Hall IC 43 cannot correctly detect the position of the rotor 22, the pump rotation becomes unstable, and the pump performance varies. Furthermore, even if the distance between the Hall IC 43 and the rotor 22 changes, the sensitivity of the Hall IC 43 changes, which affects the pump performance.

  Further, the separation plate 3 is made of resin, and in order to increase the motor efficiency, the thickness of the cylindrical outer peripheral surface 31 of the cylindrical portion of the separation plate 3 is preferably as thin as possible. Therefore, by setting the taper T1 of the cylindrical outer peripheral surface 31 to be large, it is possible to prevent the cylindrical portion having a reduced thickness from biting into the mold and from being damaged when the separation plate 3 is formed. However, since the taper T1 of the cylindrical outer peripheral surface 31 is set to be large, the clearance between the cylindrical outer peripheral surface 31 and the tooth inner peripheral surface 151 is based on the impeller 21 side of the flat surface portion 32 of the separation plate 3 and the plane Compared with the clearance C1 at the height A where the end of the tooth 15 on the side of the portion 32 is located, the clearance C2 of the height B where the end of the tooth 15 on the control base 4 side is located is increased.

  Further, at the position of the height A, the teeth inner peripheral surface 151 of the stator 1 is aligned with the cylindrical outer peripheral surface 31. Further, since the portions of the tooth inner peripheral surface 151 and the cylindrical outer peripheral surface 31 are not press-fitted at the position at the height A, a certain margin is provided in the clearance C1 in consideration of variations due to the thickness of the laminated electromagnetic steel sheets. .

  Next, the completion of the stator composed of the stator 1, the control board 4, and the carrag terminals 41 and resin molding with the separation plate 3 integrated will be described with reference to FIGS. FIG. 9 shows the stator completed and the separating plate 3 mounted in a mold.

  The mold includes a core 7 that fixes the separation plate 3 and a cavity 8 that closes an opening surface of the core 7 that faces the bottom surface portion 32 of the separation plate 3.

  A recess 71 is provided at the bottom of the inner surface of the core 7, and a protrusion provided on the flat surface portion 32 of the separation plate 3 is fitted with the recess 71 to fix the separation plate 3 to the core 7. Next, the completion of the stator is inserted so that the teeth inner peripheral surface 151 faces the cylindrical outer peripheral surface 31, and the connector 42 fixed to the control board 4 is attached to the edge of the core 7. When the opening surface of the core 7 is closed by the cavity 8, the connector 42 is sandwiched between the core 7 and the cavity 8, and the completion of the stator is fixed with the connector 42 as a fulcrum. However, since the completion of the stator is held in the mold only by the connector 42, the control board 4 is inclined by the weight of the stator 1 with the connector 42 as a fulcrum, and the stator 1 is inclined with respect to the cylindrical outer peripheral surface 31. It becomes. Further, in consideration of the variation due to the thickness of the electromagnetic steel plate on which the stator 1 is stacked, a clearance F of 1 mm or less is provided between the flat surface portion 32 of the separation plate 3 and the front end surface of the second insulating plate 14 facing each other. is there.

  A gate 72 for injecting mold resin is provided on the wall surface facing the wall surface having the edge portion to which the connector 42 of the core 7 is attached. The mold resin is adjusted to flow in parallel while sandwiching the control substrate 4 without applying stress. For this reason, the mold resin injected from the gate 72 flows along the control board 4 to the connector 42 side, collides with the wall surface on the connector 42 side, and is filled while rebounding.

  Further, the injection pressure of the mold resin is about 5 MPa, and a large stress is applied to the completion of the stator in the mold and the separation plate 3. Therefore, the injected mold resin collides with the diagonal wall surface, then flows in the direction of the flat surface portion 32 of the separation plate 3, and applies a large force to the side surface of the stator 1.

  Further, in the mold, the stator 1 is only held on the control board 4 by the carrag terminals 41, and is not received and fixed to the mold, so that when the injected mold resin collides with the stator 1, The carragage terminal 41 is deformed and the stator 1 is moved at the height A by the clearance C1. Further, since the clearance C2 is larger than the clearance C1, the injection pressure of the mold resin is more easily applied than the clearance C1, and at the time of resin molding, a fan shape is formed from the clearance C1 to the clearance C2 by the injected mold resin. The clearance is further increased, and the inclination of the cylindrical outer peripheral surface 31 and the stator 1 is increased.

  Further, in the single-phase motor, since the tooth 152 is provided on the tooth inner peripheral surface 151, a substantially wedge-shaped space 5 is formed between the tooth inner peripheral surface 151 and the cylindrical outer peripheral surface 31, and the acute angle of the space 5 is defined. The mold resin tends to flow in from the side of the bottom 152 which is the bottom side. Therefore, the injection pressure of the mold resin is concentrated on the cylindrical outer peripheral surface 31 in contact with the space 5 on the side of the stubble 152, and the cylindrical outer peripheral surface 31 cannot withstand the injection pressure of the mold resin and is deformed to the inner diameter side of the cylindrical portion. The clearance between the teeth inner peripheral surface 151 and the cylindrical outer peripheral surface 31 is increased by the amount of deformation, and the inclination of the stator 1 is changed.

From the above, when only the stator 1 is moved or the inclination is changed by resin molding, when the concentric misalignment between the teeth inner peripheral surface 151 and the cylindrical outer peripheral surface 31 occurs, the control board 4 is provided. Since the detection accuracy of the Hall IC 43 is lowered, there has been a problem that the variation in pump performance becomes very large after molding compared to before resin molding.
JP 2006-200197 A

  The pump of the present invention was invented in view of the above-described conventional problems, and an object thereof is to suppress an increase in variation in pump performance due to resin molding.

In order to solve the above problems, the pump of the present invention includes an impeller 21 for sucking and discharging liquid, a rotor 22 fixed to the impeller 21 and rotating the impeller 21, and a tooth 15 formed with a coil. a stator 1 having a comprises a separation plate 3 for isolating the rotor 22 and the stator 1, the stator 1 a pump with resin molding, the separation plate 3 is located between the rotor 22 and the stator 1 A cylindrical portion having a bottomed cylindrical shape and a flat portion provided on the opening side of the cylindrical portion and projecting outward in the radial direction of the cylindrical portion. as the diameter of the side is smaller, the taper T1 is formed in a cylindrical outer peripheral surface 31, a protrusion 321 having a small taper T2 than the taper T1 of the cylindrical outer peripheral surface 31, on the upper Kien cylindrical outer peripheral surface 31 Provided on the inner peripheral surface opposite to the position of the tooth 15, the projection 321 on the flat portion from the bottom side of the cylindrical portion has a length direction toward the flat portion from the bottom side of the cylindrical portion A clearance is provided between the protrusion 321 and the inner peripheral surface of the tooth 15, and a rib 322 is provided to protrude from the cylindrical outer peripheral surface 31 to the clearance E between the teeth 15 of the stator 1. 322 has the same length direction as the projection 321 and is formed from the bottom side of the cylindrical portion to the plane side, and the projection 321 is provided in contact with the rib 322. .

With this configuration, when the stator 1 moves due to the injection pressure of the mold resin, the stator 1 moves by the clearance formed between the protrusion 321 at the height A and the tooth inner peripheral surface 151. Compared to the movement by the clearance C1 in the example, the movement amount of the stator 1 can be reduced, which is preferable . The cylindrical outer peripheral surface 31 and the teeth 15 can be positioned, the installation angle of the Hall IC 43 can be easily adjusted, and the detection accuracy can be improved .

Further, the invention according to claim 2 of the present invention is a single-phase motor according to the invention according to claim 1 , wherein the inner periphery of the tooth 15 is provided with a set 152 for determining the rotation direction of the impeller 21. The projection 321 is provided on the side of the rib 152 of the rib 322 .

Such a configuration is preferable because, during resin molding, stress concentration due to inflow of mold resin into the space 5 on the side of the sag 152 can be reduced, and deformation of the cylindrical outer peripheral surface 31 can be prevented.

The invention described in claim 3 of the present invention is characterized in that, in the invention described in claim 1 or 2 , the rib 322 is provided at two or more locations at an equal angle with respect to the radial direction. is there.

With this configuration, not only the positioning of the cylindrical outer peripheral surface 31 and the teeth 15 but also the plurality of ribs 322 hold the stator 1 at an equal position, and only the stator 1 due to the injection pressure of the mold resin. Is preferable because it prevents the movement of.

  As described above, the present invention provides a protrusion on the cylindrical outer peripheral surface of the separation plate facing the inner peripheral surface of the teeth, thereby reducing the amount of movement of the stator and detecting the Hall IC even when the injection pressure of the mold resin is applied. There is an effect that reduction in accuracy can be reduced and increase in variation in pump performance due to resin molding can be suppressed.

  Moreover, the rib positioned at the clearance between the adjacent inner peripheral surfaces of the teeth is provided on the outer peripheral surface of the cylinder, so that the stator can be positioned relative to the outer peripheral surface of the cylinder.

  Furthermore, if two or more ribs are provided at equal angles in the radial direction, even if the cylindrical outer peripheral surface of the separation plate is deformed to the inner diameter side by the injection pressure of the mold resin, the stator is held by the ribs so that the stator There exists an effect that it can prevent moving.

Also, in a single-phase motor, if the protrusion is provided on the inner peripheral surface of the teeth and is in contact with the rib, stress concentration due to the inflow of mold resin into the space on the elastic side can be reduced during resin molding. It is possible to reduce the deformation of the outer peripheral surface of the cylinder and to prevent the change of the inclination of the stator with respect to the outer peripheral surface of the cylinder.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. Here, in the accompanying drawings, the same members as those of the conventional pump are denoted by the same reference numerals, and the description of the same structure as the conventional pump is omitted.

1-3 includes an impeller 21 for sucking and discharging liquid, a rotor 22 fixed to the impeller 21 and rotating the impeller 21, and a tooth 15 formed with a coil. The stator 1 and the separation plate 3 for separating the rotor 22 and the stator 1 are provided, and the completed stator is resin-molded. The protrusion 321 having a taper T2 smaller than the taper T1 of the cylindrical outer peripheral surface 31 of the cylindrical portion of the separation plate 3 is positioned between a height A and a height B at which the cylindrical outer peripheral surface 31 and the teeth inner peripheral surface 151 face each other. And provided on the outer circumferential surface 31 of the cylinder.

  Further, since the taper T2 of the protrusion 321 is made smaller than the taper T1 of the cylindrical outer peripheral surface 31, the clearance D between the protrusion 321 having the height B and the inner peripheral surface 151 of the tooth is the clearance at the same height B. It is smaller than C2. Further, the clearance D prevents press-fitting into the protrusion 321 of the stator 1. Further, by reducing the width of the protrusion 321 (the dimension in the circumferential direction of the cylindrical portion of the separation plate 3), the protrusion 321 can be prevented from biting into the mold when the separation plate 3 is formed. Further, the taper T1 of the cylindrical outer peripheral surface 31 is about 0.5 to 1.0 °, whereas the taper T2 of the protrusion 321 is about 0.2 °, and the width of the protrusion 321 is the width of the tooth 15. Although it is about 1/4, of course, it is not limited only to these numbers.

  Further, the ribs 322 positioned in the clearance E between the teeth 15 are formed at equal angles with respect to the radial direction with respect to the adjacent ribs 322 based on the concentric circles of the teeth inner peripheral surface 151 and the cylindrical outer peripheral surface 31. The stator 1 is positioned with respect to the separation plate 3 by providing four on the outer circumferential surface 31 of the cylinder. Further, the width of the rib 322 does not provide a margin with respect to the clearance E between the teeth 15 at the height A position, and the rib 322 is in contact with the teeth 15 at the height A. As a result, the cylindrical outer peripheral surface 31 is deformed to the inner diameter side under the injection pressure of the mold resin, and even if the stator 1 tries to move by the injection pressure of the mold resin by the amount of deformation, the stator 1 in contact with the rib 322 is It is hold | maintained by the rib 322, and it can prevent that only the said stator 1 moves. Therefore, a decrease in the detection accuracy of the Hall IC 43 due to the concentric misalignment between the teeth inner peripheral surface 151 and the cylindrical outer peripheral surface 31 is reduced.

  Further, if the ribs 322 are provided in at least two or more clearances E at equal angles with respect to the radial direction, the ribs 322 prevent not only the positioning but also movement of the stator 1 by molding. Become. Of course, ribs 322 may be provided in all the clearances E between the teeth 15.

  FIG. 4 shows another example of a three-phase motor, in which a protrusion 321 is provided in the middle between adjacent ribs 322 and ribs 322, and the stator 1 by the injection pressure of mold resin is formed by the ribs 322 and the protrusions 321. Can be prevented from moving and changes in inclination, and variations in pump performance can be reduced. The cylindrical outer peripheral surface 31 has a concentric shape with respect to the tooth inner peripheral surface 151, and each of the surfaces positioned at the same height of the tooth inner peripheral surface 151 and the cylindrical outer peripheral surface 31 is provided on each surface. Since the injection pressure of the mold resin is equally applied, the protrusion 321 may be provided at any position between the clearances E at both ends with respect to the tooth inner peripheral surface 151.

FIG. 5 shows another example of the single-phase motor in which the teeth inner peripheral surface 151 is not concentric with the cylindrical outer peripheral surface 31 due to the settling 152. In this example of the single-phase motor, the protrusion 321 is provided on the cylindrical outer peripheral surface 31 in contact with the surface of the rib 322 on the side of the dent 152 of the substantially wedge-shaped space 5. With this configuration, the stator 1 is held by the ribs 322, and the protrusions 321 can reduce stress concentration due to the flow of mold resin into the space 5 and prevent deformation of the cylindrical outer peripheral surface 31 toward the inner diameter side. Become. Therefore, it is possible to prevent the stator 1 from moving or changing in inclination by resin molding, and to suppress variations in pump performance.

It is sectional drawing in the pump of the Example of this invention. It is a perspective view of a separation plate same as the above. It is principal part sectional drawing of the rib vicinity of the three-phase motor in the height B same as the above. It is principal part sectional drawing of the rib vicinity of the other examples of the three-phase motor in the height B same as the above. It is principal part sectional drawing of the rib vicinity of the single phase motor in the height B same as the above. It is sectional drawing in the pump of a prior art example. It is principal part sectional drawing of the teeth vicinity of the three-phase motor in the height A same as the above. It is principal part sectional drawing of the teeth vicinity of the single phase motor in the height A same as the above. It is sectional drawing of the metal mold | die of resin mold shaping | molding same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 15 Teeth 151 Teeth inner peripheral surface 22 Rotor 3 Separation plate 31 Cylindrical outer peripheral surface 321 Protrusion 322 Rib 4 Control board

Claims (3)

A stator including an impeller for sucking and discharging liquid; a rotor for rotating the impeller fixed to the impeller; a stator having teeth formed with coils; and a separating plate for separating the rotor and the stator; A resin molded pump,
The separation plate includes a cylindrical portion having a bottomed cylinder located between the rotor and the stator, and a plane portion formed on the opening side of the cylindrical portion and projecting outward in the radial direction of the cylindrical portion. Configured,
The cylindrical portion is tapered on the outer peripheral surface of the cylinder so that the diameter on the bottom side is smaller than the diameter on the opening side ,
A protrusion having a smaller taper than the taper of the cylindrical outer peripheral surface, provided on the inner peripheral surface opposed to the position of the teeth of the upper Kien cylinder outer peripheral surface,
The protrusion has a length direction from the bottom side of the cylindrical part toward the flat part side and is formed from the bottom part side of the cylindrical part to the flat part side,
A clearance is provided between the protrusion and the inner peripheral surface of the tooth,
Protruding into the clearance between the teeth of the stator from the outer peripheral surface of the cylinder, providing a rib,
The rib has the same length direction as the protrusion and is formed from the bottom side of the cylindrical part to the plane side,
A pump characterized in that the protrusion is provided in contact with the rib . 2. The structure according to claim 1, wherein the teeth are configured as a single-phase motor provided with a set for determining a rotation direction of the impeller on an inner peripheral surface of the teeth, and the protrusion is provided on the set side of the rib . pump. The rib at equal angles with respect to the radial direction, according to claim 1 or 2 pump according to, characterized in that provided in two or more places.

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