JP4760503B2 - Pump and pump manufacturing method - Google Patents

Description

  The present invention relates to a pump that is driven by a motor and sucks and discharges liquid, and a method for manufacturing the pump.

  In the pump, a motor unit mainly including a stator that generates a magnetic field and a control unit that controls the stator, a pump unit that is driven by a magnetic field generated by the stator and sucks and discharges liquid such as water, and a motor unit And a partition plate that separates the pump part.

  Among these, the motor unit protects the motor unit by covering and hardening the motor unit with resin in order to prevent water from entering due to water leakage from the pump unit and corrosion due to high humidity in the installation environment of the pump. is doing.

  In the pump having such a configuration, the partition plate is deformed to the outside of the pump due to the pressure generated during the pump operation. Therefore, it is necessary to increase the thickness of the bottom surface of the partition plate, and the cost of the pump increases due to the increase in the amount of resin used. It was connected to up.

In addition, when the resin is injected into the mold by injection molding in order to cover and harden the motor part with resin, the bottom of the partition plate is pushed by the resin pressure and deforms, and the internal dimensions of the pump part are finished as designed. There was a bug that there was no. For this reason, it is necessary to perform machining such as a lathe at a location related to the positional accuracy of the impeller disposed inside the pump, leading to an increase in cost of the pump.
JP 2004-60620 A

  However, in the technique described in Patent Document 1, since the partition plate is deformed to the outside of the pump due to the pressure generated during pump operation, it is necessary to increase the thickness of the bottom surface of the partition plate, and there are restrictions on downsizing or resin The weight of the parts increased, which caused the cost to increase.

  On the other hand, when the resin is injected into the mold by injection molding in order to cover and harden the motor part with resin, the bottom surface of the partition plate is pushed by the resin pressure and deforms, and the internal dimension of the pump part is the design dimension. There was a problem that it was not finished on the street.

  The present invention solves such a conventional problem, and provides a pump capable of reducing the material used for the partition plate and forming a product with a stable size with suppressed deformation of the bottom surface of the partition plate. The purpose is to do.

In order to achieve the above object, the present invention provides a pump unit including an impeller for sucking and discharging liquid, a motor unit for driving the pump unit, a casing incorporating the pump unit, the motor unit, and the pump. A partition plate for separating the part, and a mold resin integrally molded with the motor part to protect the motor part, and the non-contact at the bottom of the cylindrical part protruding from the partition plate to the motor part The water surface has a convex spherical shape , and the water contact surface at the bottom of the cylindrical portion has a concave spherical shape .

  With this configuration, the bottom of the cylindrical portion can have a high rigidity despite a relatively small plate material cross-sectional area.

  The present invention has an effect that it is possible to provide a pump capable of reducing the material used for the partition plate and capable of forming a product with a stable size in which deformation of the bottom surface of the partition plate is suppressed.

  An embodiment of the present invention isolates a pump unit having an impeller for sucking and discharging liquid, a motor unit for driving the pump unit, a casing incorporating the pump unit, and the motor unit and the pump unit. In order to protect the motor unit, a partition plate and a molded resin integrally molded with the motor unit are provided, and the non-water contact surface at the bottom of the cylindrical portion protruding from the partition plate to the motor unit is projected. It has a spherical shape.

  With this configuration, it is possible to reduce the material used for the partition plate, and it is possible to form a product with a stable size in which deformation of the bottom surface of the partition plate is suppressed.

  Hereinafter, specific examples to which the present invention is applied will be described with reference to the drawings.

Example 1
As shown in FIG. 1, a mold resin 2 made of a thermosetting plastic or the like in which a motor unit 1 that is a driving source for driving the pump unit 4 is covered with a resin is installed on the left side of the pump unit 4. A casing 3 made of a plastic such as polyphenylene sulfide (PPS) or a metal such as stainless steel is disposed on the right side of the portion 4.

  Between the motor unit 1 and the casing 3, a plastic such as PPS or a metal such as stainless steel is used to isolate the motor unit 1 and the pump unit 4 and prevent intrusion of circulating water from the pump unit 4 to the motor unit 1. A partition plate 5 is attached. The partition plate 5 is formed so that the vicinity of the center of the partition plate 5 projects in a cylindrical shape toward the motor unit 1 side. That is, the partition plate 5 is formed as a cylindrical part 5A having a size sufficient to accommodate the pump part 4 therein, and a flange in contact with the casing 3 and the motor part 1 is formed around the opening side of the cylindrical part 5A. It is in the form.

  The motor unit 1 includes a hollow cylindrical stator 6 that generates a magnetic field, a control unit 7 that controls the stator 6, and a mold resin 2 that is hardened with resin so as to cover the stator 6 and the control unit 7. ing. The stator 6 is disposed on the outer periphery of the cylindrical portion 5A of the partition plate 5, and is configured such that the outside of the stator is covered with resin.

  A support plate 8 is connected to the left side of the stator 6, and a control unit 7 including electronic components 16 </ b> A and 16 </ b> B such as resistors and transistors is attached to the support plate 8.

  On the other hand, the pump unit 4 is circulated by a cylindrical rotor 11 made of a permanent magnet and driven by a magnetic field generated by the stator 6 and a plurality of blades 12 formed integrally with the rotor 11 and attached to the surface. The cylindrical impeller 13 made of plastic such as PPS that sucks and discharges the cylinder, the cylindrical shaft 14 made of metal such as stainless steel that rotatably supports the rotor 11 and the impeller 13, and the shaft 14 are fixed. And a hollow disk-shaped receiving plate 15 made of ceramic or the like.

  The rotor 11 is a cylindrical portion 5 </ b> A in which the partition plate 5 projects to the motor unit 1 side, and is disposed so as to face the stator 6 with the partition plate 5 interposed therebetween.

  An impeller 13 formed integrally with the rotor 11 and provided with a plurality of blades 12 on the surface is attached to the right side of the rotor 11, and the rotor 11 and the impeller 13 are placed at the center of the rotor 11 and the impeller 13. A shaft 14 for rotatably supporting is installed.

  Further, receiving plates 15 and 15 for fixing the shaft 14 are attached to both sides of the shaft 14.

  When the pump configured as described above is operated, a pressure rise occurs inside the pump unit 4, but when the pressure is applied, the water contact surface 5 a inside the bottom portion 5 </ b> B in the cylindrical portion 5 </ b> A of the partition plate 5 May be deformed to the mold resin 2 side. However, the non-water-contact surface 5b outside the bottom 5B in the cylindrical portion 5A of the partition plate 5 is convex, for example, has a spherical shape with a radius of about 300 mm. Compared to the above, the moment of inertia of the cross section is higher, and although the cross-sectional area of the plate material is relatively small, high rigidity can be imparted and deformation of the bottom surface of the partition plate can be suppressed. For this reason, the material used for the partition plate 5 can be reduced, and the cost can be reduced.

  Further, if the water contact surface 5a on the bottom surface of the partition plate is flat, the bottom wall thickness is irregular, for example, about 2 mm at the outer periphery and about 3 mm at the center, and the cross-sectional secondary moment is 2 mm. The strength is increased by about 2.5 times. Alternatively, if the water contact surface 5a on the bottom surface of the partition plate has a concave curved surface shape, for example, the bottom wall thickness is a uniform thickness of about 2 mm in a hollow spherical shape, but the cross-sectional second moment is a flat uniform wall thickness of 2 mm. Compared to about 1.25 times, the strength can be increased.

  Here, a process of covering the motor unit 1 with a mold resin will be described.

  As shown in FIG. 2, 9 is a lower mold of the molding die. The lower mold 9 is formed with a convex portion 12 having a cylindrical shape corresponding to the cylindrical portion 5 </ b> A of the partition plate 5. First, the partition plate 5 is installed on the lower mold 9, and then the stator 6 and the control unit 7 are installed on the cylindrical portion 5 </ b> A protruding from the partition plate 5. At this time, the control unit 7 is already attached to the support plate 8 provided in the stator 6.

  In FIG. 2, 10 is the upper mold of the molding die. When the molding machine is started, as shown in FIG. 3, the lower mold 9, the stator 6, and the control unit 7 are raised in a direction approaching the upper mold 10, and the mold is closed. By closing the mold, a cavity (cavity) 11 is formed in the mold. Then, the resin is poured from the resin inlet 17 formed in the upper mold 10, and further pressure is continuously applied to the resin from the molding machine, so that the mold resin 2 is spread to every corner in the mold cavity 11. FIG. 4 shows a state where the mold resin 2 has spread to every corner.

  Here, pressure is applied to the non-water contact surface 5b on the bottom surface of the partition plate through a resin from the molding machine. A gap S of about 0.2 mm may occur between the water contact surface 5a on the bottom surface of the partition plate and the top surface 12a of the convex portion 12 of the lower mold 9 due to dimensional variations of the partition plate 5 or the like. If the strength of the bottom surface of the partition plate (the bottom portion 5B of the cylindrical portion 5A) is insufficient, the water contact surface of the bottom surface of the partition plate on the opposite side due to the resin pressure received by the non-water contact surface 5b of the bottom surface of the partition plate The bottom surface may be deformed until 5a contacts the top surface 12a of the lower mold 9.

  Thereby, the position of the receiving plate installation surface 18 is deformed to the lower mold 9 side, and there is a concern that the position dimension of the receiving plate installation surface 18 at the time of completion of the component does not follow the drawing instruction (as designed). . However, the non-water contact surface 5b has a convex spherical shape and can resist the resin pressure on the basis of the principle that the structure of the surface presses against the pressure applied to the mold resin 2 by the molding machine. It is possible to form a product with a stable dimension in which deformation of the bottom surface of the plate is suppressed.

The following process will be described. After the mold is closed for a certain period of time until the mold resin 2 is cured, the mold is opened, and the molded motor finished product is taken out. FIG. 5 is a view of completion of the mold motor taken out from the mold. Reference numeral 19 denotes a spool, which can be cut only with a tool such as a nipper so that only the molded motor completed portion is formed.

  And in this example, although the bathtub water circulation device is shown as an example of the liquid supply device to which the pump according to the present invention is applied, the present invention pump is, for example, a well pump device, a hot water supply device, a drainage supply device, etc. It can be applied to any liquid supply device.

  The pump unit of the present invention can be expected to be applied to various pumps used in, for example, fuel cell devices and heat pump devices.

It is sectional drawing of the pump shown in Example 1. FIG. FIG. 3 is a cross-sectional view showing a process of installing components on the mold lower mold shown in Example 1; It is sectional drawing which shows the metal mold | die closing process before the molding start shown in Example 1. FIG. FIG. 3 is a cross-sectional view showing a resin filling process of mold forming shown in Example 1. It is sectional drawing which shows the mold motor finished product taking-out process after the mold forming shown in Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor part 2 Mold resin 3 Casing 4 Pump part 5 Partition plate 5A Cylindrical part 5B Bottom part of cylindrical part 5a Water contact surface 5b Non-water contact surface 6 Stator 7 Control part 8 Support plate 9 Lower mold 10 Upper mold 11 Mold cavity part (cavity)

Claims (2)

A pump unit having an impeller for sucking and discharging liquid;
A motor unit for driving the pump unit;
A casing containing the pump part;
A partition plate separating the motor unit and the pump unit;
In order to protect the motor unit, the motor unit and a molded resin integrally molded,
The non-water contact surface at the bottom of the cylindrical portion protruding from the partition plate to the motor portion is a convex spherical shape , and the water contact surface at the bottom of the cylindrical shape portion is a concave spherical shape. pump. Installing a partition plate on the lower mold;
Installing a stator and a control unit on the partition plate;
Closing the upper mold relative to the lower mold;
Filling a resin in a cavity formed by a lower mold and an upper mold and curing the resin;
Opening the mold,
And a step of taking out a finished molded motor finished product.

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