JP2008075462A - Pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump capable of reducing cost by eliminating a process for reattaching a partitioning plate and improving precision of dimension of the inside of the pump. <P>SOLUTION: This pump is provided with a pump part 4 provided with an impeller 13 for absorbing and discharging liquid, a motor part 1 for driving the pump part 4, a casing 3 incorporating the pump part 4, the partitioning plate 5 for separating the motor part 1 from the pump part 4, and mold resin 2 molded integrally with the motor part 1 to protect the motor part 1. A projection 20 for preventing coming-off buried into the mold resin 2 to prevent the partitioning plate 5 from uplifting from the mold resin 2 is provided on a face 5b in non-contact with water in a bottom part 5B of a cylindrical shape part 5A protruding into the motor part 1 from the partitioning plate 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pump that is driven by a motor and sucks and discharges liquid.

  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. (For example, refer to Patent Document 1).
JP 2004-60620 A

  However, in the technique described in Patent Document 1, when resin is injected into a mold by injection molding in order to cover and harden the motor part with resin, residual air wraps around the bottom surface of the partition plate and becomes compressed air. There was a problem that the partition plate was pushed back by the compressed air and floated after opening. For this reason, the process of re-fitting the floating partition plate occurs, and even if it is re-fitted, post-processing with a lathe etc. to ensure the dimensional accuracy of the internal dimensions of the pump part, etc. It was.

  Therefore, the present invention is for solving such a conventional problem, and it is possible to reduce the cost by eliminating the process of reattaching the partition plate and improving the internal dimensional accuracy of the pump. The purpose is to provide a simple pump.

  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 is provided with a retaining protrusion that is embedded in the mold resin and prevents the partition plate from being lifted from the mold resin.

  With this configuration, it is possible to eliminate the process of reattaching the partition plate and improve the internal dimensional accuracy of the pump.

  The present invention has an effect of eliminating the step of reattaching the partition plate and providing a pump capable of improving the internal dimensional accuracy of the pump.

  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, the non-water contact surface at the bottom of the cylindrical portion protruding from the partition plate to the motor unit, A retaining protrusion is provided which is embedded in the mold resin and prevents the partition plate from being lifted from the mold resin.

  With this configuration, it is possible to eliminate the process of reattaching the partition plate and improve the internal dimensional accuracy of the pump.

  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 serving as a driving source for driving the pump unit 4 is covered with resin is provided 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, the motor unit 1 and the pump unit 4 are isolated to prevent the intrusion of circulating water from the pump unit 4 to the motor unit 1. A partition plate 5 is attached. And this partition plate 5 has the cylindrical part 5A in which the center part vicinity protruded and formed in the cylindrical shape to the motor part 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 arranged on the outer periphery of the cylindrical portion 5A of the partition plate 5, and has a configuration in which the outside of the stator is covered with the mold resin 2.

  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 shaft 14 is guided by inserting both end portions thereof into boss portions 3A and 21 provided on the casing 3 and the partition plate 5, respectively. The receiving plate 15 is provided on the front end surfaces of both the boss portions 3A, 21.

  The rotor 11 is disposed in the cylindrical portion 5 </ b> A in which the partition plate 5 projects to the motor unit 1 side, and is opposed to the stator 6 through the partition plate 5. On the right side of the rotor 11, an impeller 13 formed integrally with the rotor 11 and provided with a plurality of blades 12 on the surface is attached. 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.

  In the present embodiment, the non-water contact surface 5b of the bottom 5B of the cylindrical portion 5A of the partition plate 5 is embedded in the mold resin 2 to prevent the partition plate 5 from being lifted from the mold resin 2. A retaining projection 20 is provided.

  As shown in FIG. 2, the retaining protrusion 20 is provided at the cylindrical portion 20A protruding from the non-water contact surface 5b that does not come into contact with water on the side opposite to the pump portion 4, and at the tip of the cylindrical portion 20A It has an annular flange portion 20B and has a cross-sectional key shape as a whole. The retaining projections 20 are integrally formed of the same material as that of the partition plate 5 so that the mold resin 2 wraps around the space 30 formed between the flange portion 20B and the non-water contact surface 5b. . That is, the retaining protrusion 20 has a shape embedded entirely in the mold resin 2.

  Further, the cylindrical portion 20A of the retaining projection 20 is formed with a hole portion 31 for discharging residual air at the time of molding resin injection. The hole 31 is formed so as to penetrate the cylindrical portion 20A in parallel with the non-water contact surface 5b.

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

  As shown in FIG. 3, a convex portion 18 having a cylindrical shape corresponding to the cylindrical portion 5 </ b> A of the partition plate 5 is formed on the lower die 9 of the molding die. First, the partition plate 5 is installed on the lower mold 9, and then the stator 6 and the control unit 7 are arranged on the cylindrical portion 5 </ b> A protruding from the partition plate 5. At this time, the control unit 7 on which the electronic components 16A and 16B are mounted is already attached to the support plate 8 provided on the stator 6. Note that the upper mold 10 of the molding die is still arranged at a position above the lower mold 9.

  Next, when the molding machine is started, as shown in FIG. 4, 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 portion (cavity) 11 for filling the mold resin is formed in the mold. Then, the resin is poured from the resin inlet 17 formed in the upper mold 10, and pressure is further applied from the molding machine to the resin, so that the mold resin 2 is spread to every corner in the cavity 11.

  FIG. 5 shows a state where the mold resin 2 has spread to every corner of the cavity 11. At this time, in the space portion 30 formed between the flange portion 20B and the non-water contact surface 5b, the air existing inside the mold remains without being discharged outside the mold, and the resin injection pressure Compressed air. Then, after the filling of the mold resin 2 is completed, the mold is left closed for a certain period of time until the mold resin 2 is cured, then the mold is opened, and the molded motor finished product is taken out. FIG. 6 is a view of completion of the mold motor taken out from the mold. This mold motor is provided with a runner 30, and the runner 30 can be cut off with a tool such as a nipper so that only the mold motor completed portion can be formed.

  At this time, since the convex portion 18 is removed from the cylindrical portion 5A in FIG. 5, the bottom portion 5B of the partition plate 5 loses the convex portion 18 that is the backing. For this reason, the surface pressure from the compressed air remaining in the space 30 is applied only to the partition plate 5, and a force to lift the partition plate 5 is applied. However, in the present embodiment, as shown in FIG. 2, the retaining projection 20 is provided on the non-water-contact surface 5b of the cylindrical portion 5A of the partition plate 5, so that the flange portion of the retaining projection 20 is provided. It is possible to prevent the mold resin 2 from going around 20B and the partition plate 5 from being lifted from the mold resin 2. Further, since the retaining protrusion 20 is provided with a hole portion 31 that penetrates the cylindrical portion 20A, air is discharged from the hole portion 31 when the mold resin 2 flows in, so that the mold resin 2 Insufficient filling can be prevented.

  As described above, according to the present embodiment, the partition plate 5 is provided with the retaining projection 20 having a key shape in cross section in which the flange portion 20B is formed at the tip of the cylindrical portion 20A on the non-water contact surface 5b of the partition plate 5. 5 can be prevented, and the partition plate 5 from the mold resin 2 can be prevented from lifting. As a result, the step of reattaching the partition plate 5 is not necessary, and the dimensional accuracy inside the pump can be improved.

(Example 2)
In the second embodiment, the shape of the retaining protrusion is different from that of the first embodiment, and is a wall-shaped protrusion 22 that stands vertically with respect to the non-water contact surface 5b of the partition plate 5 as shown in FIG. A plurality of 22 are provided so as to form an annular shape in plan view. The protrusion 22 has a rectangular wall shape with a low protrusion height, and has a through hole 32 in the thickness direction through which residual air is discharged during molding resin injection.

  If the protrusion 22 having such a shape is provided on the non-water contact surface 5b, the protrusion 22 is embedded in the mold resin 2, so that the partition plate 5 is prevented from being lifted from the mold resin 2. Further, when the mold resin 2 wraps around the protrusions 22, the air is discharged from the hole 32, and insufficient filling of the mold resin 2 can be prevented.

(Example 3)
In the third embodiment, the shape of the retaining protrusion is different from that of the first and second embodiments, and a ring-shaped (ring-shaped) protrusion 33 protruding from the non-water contact surface 5b of the partition plate 5 as shown in FIG. A hole 34 is formed through the side surface of the projection 33 to discharge residual air when the mold resin is injected.

  If the protrusion 33 having such a shape is provided on the non-water contact surface 5b, the protrusion 33 is embedded in the mold resin 2, so that the partition plate 5 is prevented from being lifted from the mold resin 2. Further, when the mold resin 2 wraps around the protrusion 33, the air is discharged from the hole 34, and insufficient filling of the mold resin 2 can be prevented.

Example 4
The position at which the retaining protrusions 20, 22, 33 are provided may be at the center of the bottom of the cylindrical portion 5A of the partition plate 5 as shown in FIGS. 2 and 8, or as shown in FIG. The position near the outer periphery of the water surface 5b may be sufficient. 2 and 8, when the retaining projections 20 and 33 are provided at the center of the bottom of the cylindrical portion 5A, the retaining projections 20 and 33 are located at a short distance from the boss portion 21 of the partition plate 5. Therefore, the position of the tip surface 21A of the boss portion 21 can be effectively restricted, and the dimensional accuracy inside the pump can be further increased.

  In the present embodiment, the bathtub water circulation device is shown as an embodiment of the liquid supply device to which the pump according to the present invention is applied, but the pump of the present invention 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. 4A and 4B show retaining projections provided on the partition plate of the pump shown in Embodiment 1, wherein FIG. 5A is an enlarged perspective view of a main portion showing the retaining projections, and FIG. 5B is a cross-sectional view of the retaining projection. . 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. It is a principal part expansion perspective view which shows the other example of the protrusion for retaining which was provided in the partition plate of the pump shown in Example 2. FIG. FIG. 10 is an enlarged perspective view of a main part showing another example of a retaining protrusion provided on a partition plate of a pump shown in Example 3. FIG. 10 is an enlarged perspective view of a main part showing another example of a retaining protrusion provided on a partition plate of a pump shown in Example 4;

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 5b Non-water contact surface 6 Stator 7 Control part 8 Support plate 9 Lower mold 10 Upper mold 11 Mold cavity (cavity)
20, 22, 33 Protrusion for retaining 20B Flange 31, 32, 34 Hole

Claims (6)

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,
A non-removal protrusion that is embedded in the mold resin and prevents the partition plate from being lifted from the mold resin is provided on the non-water contact surface at the bottom of the cylindrical portion that protrudes from the partition plate to the motor portion. Features a pump. The pump according to claim 1,
The pump according to claim 1, wherein the retaining projection has a key shape in cross section having a flange portion at a distal end portion, and the mold resin wraps around the flange portion. The pump according to claim 1,
The pump, wherein the retaining protrusion is an annular protrusion, and the mold resin wraps around the protrusion. The pump according to claim 1,
The pump according to claim 1, wherein the retaining protrusion is a wall-shaped protrusion that stands vertically with respect to the non-water-contact surface, and the mold resin wraps around the protrusion. The pump according to any one of claims 2 to 4,
The pump according to claim 1, wherein a hole for discharging residual air at the time of injection of the mold resin is formed in the retaining protrusion so as to penetrate in parallel with the non-water contact surface. The pump according to any one of claims 2 to 5,
The pump according to claim 1, wherein the retaining projection is provided at the center of the bottom of the cylindrical portion of the partition plate.

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