JP2014118950A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the accuracy of internal dimensions of a partition plate by reliably preventing the partition plate from deforming.SOLUTION: The pump comprises: a motor 1 including a stator 6 and a rotor 41; an impeller 13 connected to the rotor and rotated to suck and discharge liquid; a bottomed cylindrical partition plate 5 located between the stator and the rotor to separate them; and a molding resin 2 for molding the stator arranged on the outside surface side of the partition plate. The pump comprises: a retaining protrusion part 20 embedded in the molding resin on the outer surface of a bottom plate part 5B of the bottomed cylindrical partition plate; and a plurality of reinforcing ribs 40 extending from the retaining protrusion part 20 to the outer periphery side.

Description

  The present invention relates to a pump that draws liquid and pressurizes and discharges liquid by rotational driving of an impeller by a motor.

  Among these types of pumps, there is a pump called a can pump in which a motor for driving an impeller is integrally provided. In this canned pump, the rotor in the motor is formed integrally with the impeller, and the stator in the motor and the impeller (rotor) are partitioned by a bottomed cylindrical partition plate. In addition, the stator is fixed to the outer surface of the partition plate with a mold resin to prevent water from entering the stator, corrosion due to the installation environment that is often in high humidity, and heat generated in the motor section. Heat dissipation to the outside.

  Here, the mold resin is molded by injecting it into a mold by injection molding. At the time of molding, residual air may wrap around the bottom outer surface of the partition plate. If it will be in such a state, when a metal mold | die is opened, the partition plate will be pushed back with the said compressed air, and the malfunction that a partition plate floats from mold resin may generate | occur | produce.

  In order to prevent this, Patent Document 1 discloses that a retaining protrusion that is embedded in the mold resin and functions as an anchor is provided on the outer surface of the bottom of the partition plate.

JP 2008-077542 A

  However, the presence of the retaining protrusion may cause air to remain, and the retaining protrusion itself is deformed by the injection pressure of the mold resin or the pressure of the residual air as compressed air, It may be difficult to prevent the partition plate from lifting from the mold resin.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a pump that can reliably prevent deformation of the partition plate and improve the internal dimensional accuracy of the partition plate.

  A motor according to the present invention includes a motor including a stator and a rotor, an impeller coupled to the rotor and driven to rotate to suck and discharge liquid, and a bottomed cylindrical shape that is between the stator and the rotor and partitions between the two. And a stator disposed on the outer surface side of the partition plate is molded with a mold resin, and the retaining plate is embedded in the mold resin on the outer surface of the bottom plate portion of the bottomed cylindrical partition plate. In addition to having a protrusion, the outer surface of the bottom plate portion includes a plurality of reinforcing ribs extending from the retaining protrusion to the outer peripheral side.

  Even if it remains in the vicinity of the outer surface of the bottom plate part of the partition plate during resin molding, the internal dimension accuracy of the partition plate in which the rotor is located is kept high so that the reinforcing ribs prevent deformation of the partition plate and the retaining projection. be able to.

  According to the present invention, it is possible to reliably prevent the partition plate from being deformed due to residual air when molding the mold resin, and thus it is possible to obtain a highly accurate pump.

It is sectional drawing of an example of embodiment of this invention. It is a perspective view of a partition plate same as the above. It is a side view which shows the protrusion for retaining and the rib for reinforcement of a partition plate same as the above. It is a disassembled perspective view which shows the mold metal mold | die same as the above, and the components set to this metal mold | die. It is sectional drawing of the state which set the components to the mold metal mold | die same as the above. It is sectional drawing which shows the resin filling process to the mold metal mold | die same as the above. It is sectional drawing of the components after a resin mold same as the above. It is a side view same as the above. It is the XX sectional view taken on the line in FIG.

  A first invention includes a motor including a stator and a rotor, an impeller coupled to the rotor and driven to rotate to suck and discharge liquid, and a bottomed cylindrical shape that is between the stator and the rotor and partitions between the two. In a pump comprising a partition plate and a stator disposed on the outer surface side of the partition plate is molded with a mold resin, the retaining plate embedded in the mold resin on the outer surface of the bottom plate portion of the bottomed cylindrical partition plate In addition to the protrusions, the outer surface of the bottom plate part includes a plurality of reinforcing ribs extending outward from the retaining protrusions.

  As a result, deformation of the bottom plate portion of the partition plate, in particular, lifting from the mold resin can be surely prevented, and deformation of the retaining projection can also be prevented, thereby improving the internal dimensional accuracy of the partition plate. Can do.

  In the second invention, in particular, the retaining protrusion in the first invention is lower in height from the outer surface of the bottom plate than the retaining protrusion.

  Accordingly, the reinforcing ribs do not hinder the flow of the mold resin during the injection molding of the mold resin, and it is possible to suppress the residual air during the molding that causes the partition plate to be deformed.

  In the third aspect of the invention, in particular, the reinforcing rib in the first aspect of the invention or the second aspect of the invention has a cross-sectional shape that is wider on the tip side than the base.

  Accordingly, the reinforcing rib also has a function of preventing the partition plate from lifting up, and the partition plate can be prevented from being lifted up from the mold resin.

  In the fourth invention, in particular, the reinforcing rib in any one of the first to third inventions extends to the outer peripheral surface of the cylindrical portion of the partition plate.

  As a result, not only the bottom plate portion of the partition plate but also the cylindrical portion can be reinforced by the reinforcing rib, and the deformation of the partition plate can be prevented more reliably and the internal dimensional accuracy of the partition plate can be further improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

  The pump of the illustrated example pressurizes the liquid sucked from the suction port 3 </ b> A by the rotation of the impeller 13 in the pump chamber 4 and discharges it from the discharge port 3 </ b> B. A rotor 41 is formed integrally with the impeller 13.

  The pump chamber 4 is formed as a space surrounded by a casing 3 having a suction port 3A and a discharge port 3B, and a partition plate 5 having a bottomed cylindrical shape and provided at an opening edge and joined to the casing 3. Yes. The casing 3 and the partition plate 5 are made of a plastic such as polyphenylene sulfide (PPS) or a metal such as stainless steel.

  An impeller 13 including a plurality of blades 12 and made of plastic such as PPS, and a rotor 41 including a plurality of permanent magnets and formed integrally with the impeller 13 are rotatable by a shaft 14 via a bearing 45. It is supported by.

  The shaft 14 formed of metal such as stainless steel is supported by a boss 21 provided on the partition plate 5 and a boss 3C provided on the casing 3. In the figure, reference numeral 15 denotes a thrust receiving plate.

  A stator 6 in the motor 1 is disposed on the outer peripheral side of the cylindrical portion 5 </ b> A of the bottomed cylindrical partition plate 5 that surrounds the outer periphery of the rotor 41. Further, a control circuit board 7 is arranged adjacent to the bottom plate portion 5B of the bottomed cylindrical partition plate 5. In the figure, 8 is a support plate for connecting the stator 6 and the control circuit board 7, and 16 A and 16 B are electronic components such as resistors and transistors mounted on the control circuit board 7.

  The stator 6 and the control circuit board 7 for controlling the magnetic field generated by the stator 6 are molded with the mold resin 2 made of thermosetting plastic or the like and integrated with the partition plate 5.

  The rotor 41 whose outer peripheral surface is opposed to the inner periphery of the stator 6 through the cylindrical portion 5 </ b> A of the partition plate 5 receives the magnetic field generated by the stator 6 and rotates to rotate the impeller 13.

  A ring-shaped retaining protrusion 20 is provided at the center of the outer surface side of the bottom plate portion 5B of the bottomed cylindrical partition plate 5. As shown in FIGS. 2 and 3, the retaining projection 20 includes a cylindrical portion 20A that protrudes from the outer surface of the bottom plate portion 5B, and an annular flange portion 20B that extends from the tip of the cylindrical portion 20A to the outer periphery. .

  Further, reinforcing ribs 40 are provided from the outer surface of the bottom plate portion 5B of the partition plate 5 to the outer peripheral surface of the cylindrical portion 5B. Of the two reinforcing ribs 40 that intersect in a cross shape at the center of the outer surface of the bottom plate portion 5B, one reinforcing rib 40 is connected to the cylindrical portion 20A of the retaining protrusion 20. The other reinforcing rib 40 passes through a pair of holes 31 and 31 communicating the inside and outside of the cylindrical portion 20A provided in the cylindrical portion 20A.

  Further, the portion 40A located on the outer surface of the bottom plate portion 5B of the two reinforcing ribs 40 has a reverse sectional taper on both side surfaces and a cross-sectional shape that is wider on the tip side than the base portion. . A portion 40C located on the outer surface of the cylindrical portion 5B has a cross-sectional shape with a substantially constant width.

  Here, the reinforcing rib 40 passing through the hole portion 31 includes a narrow neck portion 40B having a narrow width at a boundary portion between the bottom plate portion 5A and the cylindrical portion 5B. The narrow neck portion 40B is provided to compensate for the movement of the side core when the hole portion 31 and the reinforcing rib 40 having a wider width on the distal end side are molded.

  Next, the molding process of the mold resin 2 will be described. As shown in FIG. 4, the partition plate 5 is placed on the lower mold 9 provided with a convex portion 18 having a cylindrical shape corresponding to the cylindrical portion 5A of the partition plate 5. The stator 6 and the control circuit board 7 are further arranged on the partition plate 5.

  Next, as shown in FIG. 5, the lower die 9 and the upper die 10 are closed, and the resin is fed into the cavity 11 formed between the two from the inlet 17 provided in the upper die 10 with pressure applied. The mold is performed as shown in FIG. Then, when the resin is cured, the mold is opened, and the runner 30 is separated from the taken-out mold product shown in FIG. 7 using a tool such as a nipper.

  When resin molding is performed in this way, the retaining protrusion 20 of the partition plate 5 functions as an anchor embedded in the mold resin 2 and prevents the partition plate 5 from being peeled off. Note that the hole 31 provided in the cylindrical portion 20A of the ring-shaped retaining protrusion 20 allows residual air to escape and prevents the cylindrical portion 20A from inhibiting the resin inflow into the cylindrical portion 20A.

  By the way, since the flange portion 20B that functions as an anchor of the retaining projection 20 is an overhanged portion, there is a mold in the space between the flange portion 20B and the outer surface of the bottom plate portion 5B. The air existing inside may remain without being discharged outside the mold. Moreover, the air is compressed air due to the injection pressure of the resin.

  For this reason, in the state where air remains in the space, if the mold 18 is opened and the convex portion 18 of the lower mold 9 that has been in contact with the inner surface of the partition plate 5 is removed, the partition is divided by the surface pressure due to the compressed air. The bottom plate portion 5B of the plate 5 may partially swell toward the inner surface side.

  However, in the partition plate 5 in the illustrated example, the reinforcing ribs 40 provided on the bottom plate portion 5B prevent deformation of the bottom plate portion 5B and the retaining projection 20 due to the surface pressure, so that the internal dimensional accuracy of the partition plate 5 decreases. There is no end.

  The reinforcing rib 40 is shorter than the retaining protrusion 20 and does not obstruct the resin flow during resin molding. In addition, the portion 40A of the reinforcing rib 40 located on the outer surface of the bottom plate portion 5B of the partition plate 5 has a wider tip than the base portion as described above, and therefore the partition plate 5 floats from the mold resin 2. Also prevent.

  In addition, the reinforcing rib 40 in the illustrated example includes a rib 40c extending to the outer peripheral surface of the cylindrical portion 5A of the partition plate 5, so that not only the bottom plate portion 5B of the partition plate 5 but also the side surface of the cylindrical portion 5A is provided. Reinforce. For this reason, the deformation of the partition plate 5 can be prevented more reliably, the internal dimensional accuracy can be further improved, and the floating of the partition plate 5 from the mold resin 2 can be further reliably prevented.

  The reinforcing ribs 40c located on the outer surface of the cylindrical portion 5A of the partition plate 5 are provided between the teeth 6A of the stator 6 as shown in FIG. For this reason, the presence of the reinforcing rib 40C does not increase the distance between the rotor 41 and the stator 6 and reduce the motor capacity.

  Thus, according to the present invention, the reinforcing rib 40 reliably prevents deformation of the bottom plate portion 5B of the partition plate 5 and also prevents deformation of the retaining projection 20 so that the partition plate from the mold resin 2 can be prevented. 5 can be reliably prevented.

  Since the pump according to the present invention can ensure internal dimensional accuracy, it can be expected to be applied to various pumps used in fuel cell devices, heat pump devices, and the like as pumps of liquid supply devices.

2 Mold resin 3 Casing 4 Pump chamber 5 Partition plate 5A Cylindrical portion 5B Bottom plate portion 6 Stator 7 Control circuit board 20 Retaining protrusion 20A Cylindrical portion 20B Flange portion 31 Hole portion 40 Reinforcement rib

Claims (4)

A motor including a stator and a rotor; an impeller coupled to the rotor and driven to rotate to suck and discharge liquid; and a bottomed cylindrical partition plate between the stator and the rotor and partitioning between the two. In the pump in which the stator disposed on the outer surface side of the partition plate is molded with mold resin,
The bottom plate portion of the bottomed cylindrical partition plate includes a retaining projection that is embedded in the mold resin, and includes a plurality of reinforcing ribs extending from the retaining projection to the outer peripheral side on the outer surface of the bottom plate portion. A pump characterized by that.   2. The pump according to claim 1, wherein the retaining protrusion has a height from the outer surface of the bottom plate that is lower than the retaining protrusion. 3.   The pump according to claim 1 or 2, wherein the reinforcing rib has a cross-sectional shape having a wider width on the distal end side than the base portion.   The pump according to any one of claims 1 to 3, wherein the reinforcing rib is extended to an outer peripheral surface of a cylindrical portion of the partition plate.

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