JP2009197729A - Rotor of motor for pump, motor for pump, pump, and method for manufacturing rotor of motor for pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a motor for a pump capable of securing the detection accuracy of a rotor position even if a distance between a magnetic pole position detection element and a magnet becomes large caused by the existence of a seal box, preventing the movement of the magnet during integral molding of the rotor, and improving quality. <P>SOLUTION: In this rotor 100 of the motor for the pump, the ring shape magnet 1 and a sleeve 2 having the magnet 1 disposed therein are integrally molded of thermoplastic resin, and an impeller attaching part 3a is simultaneously formed out of the thermoplastic resin, and the magnet 1 has a tapered part 1a chamfered at an edge on an outer circumference side of an end opposing the magnetic pole position detection element. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotor of a pump motor. Further, the present invention relates to a pump motor using the rotor of the pump motor, a pump, and a method for manufacturing the rotor of the pump motor.

  The configuration of the conventional pump will be briefly described. The pump includes a mold stator including a substrate on which the magnetic pole position detection element is mounted, a seal box provided inside the mold stator and partitioning water in the pump and the mold stator, and a substantially center in the seal box. A rotor fixed to the shaft, rotatably fitted to the shaft, having a magnet, a sleeve fitted to the shaft, and an impeller attachment portion; and attached to the impeller attachment portion of the rotor. An impeller and a casing attached to the outside of the impeller are provided.

  In the above configuration, a seal box is interposed between the magnetic pole position detection element and the magnet. For this reason, there has been a problem that the distance between the magnetic pole position detection element and the magnet is increased, and the position detection accuracy of the rotor is reduced.

  In addition, there is a problem that when the magnet becomes high temperature due to long-time operation or the like, the magnetic force becomes weak, and the magnetic force to the magnetic pole position detecting element is reduced, so that the position detection accuracy of the rotor is lowered.

In order to solve such a problem, for example, by providing a protrusion on the Hall element side of the magnet end surface, the distance between the magnet and the Hall element is shortened, the magnetic force to the Hall element is increased, and the magnet becomes high temperature, Even if the magnetic force of the magnet is reduced, the magnetic line of force to the Hall element is not insufficient, so the parts of the control unit do not cause abnormal heat generation, and a brushless motor that obtains high reliability in detecting the magnetic force of the Hall element that can continue to operate normally It has been proposed (see, for example, Patent Document 1).
JP-A-2005-323452

  In addition to the above problems, in the rotor, the magnet and the sleeve are integrally formed of a thermoplastic resin, but the magnet may move due to the resin pressure during the integral molding.

  This invention was made to solve the above problems, and even if the distance between the magnetic pole position detection element and the magnet increases because the seal box is interposed, the position detection accuracy of the rotor can be secured, It is another object of the present invention to provide a rotor for a pump motor, a pump motor, and a method for manufacturing a pump and a rotor for a pump motor that can prevent the movement of the magnet when the rotor is integrally formed and improve the quality.

The rotor of the pump motor according to the present invention is mounted on a pump that partitions water and a mold stator having a substrate on which a magnetic pole position detection element is mounted with a seal box, and is rotatably accommodated in the seal box. Is a rotor of a motor for a pump provided with an impeller mounting portion that faces the magnetic pole position detection element and attaches the impeller to the other end,
A ring-shaped magnet and a sleeve arranged inside the magnet are integrally formed of thermoplastic resin, and at the same time, an impeller mounting portion is formed of thermoplastic resin.
The magnet includes a tapered portion chamfered at a corner portion on the outer peripheral side of an end portion facing the magnetic pole position detecting element.

  The rotor of the pump motor according to the present invention includes a tapered portion chamfered on the outer peripheral side of the end facing the magnetic pole position detecting element, so that the magnetic pole position detecting element is provided at a position. Accordingly, by changing the shape of the taper portion of the magnet, the magnetic pole position detecting element can be brought close to the position where the surface magnetic flux density of the magnet end surface is maximized.

Embodiment 1 FIG.
1 and 2 are diagrams showing the first embodiment, and FIG. 1 is a diagram showing a rotor 100 of a pump motor (FIG. 1A is a cross-sectional view taken along line AA in FIG. 1B, FIG. (b) is a right side view), FIG. 2 is a view showing the magnet 1 (FIG. 2 (a) is a left side view, FIG. 2 (b) is a cross-sectional view taken along line BB in FIG. 2 (a), and FIG. 2 (c). Is a right side view).

  As shown in FIG. 1, in a rotor 100 of a pump motor, a ring-shaped magnet 1 and a sleeve 2 disposed inside the magnet 1 are integrally formed of a thermoplastic resin such as PPS (polyphenylene sulfide). Is done. A portion made of a thermoplastic resin is referred to as a resin portion 3. An impeller mounting portion 3a for attaching an impeller (described later) is formed in the resin portion 3 of thermoplastic resin.

  The magnet 1 is a resin magnet that uses a material obtained by mixing a magnetic material with a thermoplastic resin.

  The sleeve 2 has a cylindrical shape. Since the sleeve 2 is fitted and rotated on a fixed shaft (described later) of a pump (described later), the sleeve 2 is manufactured from a sintered carbon suitable for a bearing material, a thermoplastic resin such as PPS containing carbon, a ceramic, or the like. The The sleeve 2 is provided with a notch for preventing rotation on the outer diameter side and a step for removing the sleeve (not shown).

  The resin part 3 is provided with a plurality of counter holes 3b penetrating in the axial direction for reducing the pressure difference generated between the front and back of the impeller during pump operation. In the example of FIG. 1, four counter holes 3b are formed.

  In the resin portion 3 formed on the end surface of the magnet 1 on the impeller mounting portion 3a side, a first concave portion 3c is formed at a position of a mold pressing portion provided in the upper mold of the resin molding die. In the example of FIG. 1, the first recesses 3 c are formed at two locations at approximately 180 ° intervals. The first recess 3 c is formed at a position of a second notch 1 b (described later) of the magnet 1.

  Further, the resin portion 3 formed on the inner peripheral surface of the end surface of the magnet 1 opposite to the impeller mounting portion 3a is fitted with a positioning protrusion provided on the lower mold of the resin molding die. A recess 3d is formed. In the example of FIG. 1, the second recesses 3d are formed at four locations at approximately 90 ° intervals. The second recess 3d is formed at a position of a first notch 1c (described later) of the magnet 1.

  Next, the configuration of the magnet 1 will be described with reference to FIG. The magnet 1 is formed in the rotor 100 of the pump motor, and the tapered first notches 1c are arranged at substantially equal intervals in the circumferential direction on the inner peripheral side of the end surface opposite to the impeller mounting portion 3a. A plurality are provided. In the example of FIG. 2, there are eight first cutouts 1c. The first notch 1c has a tapered shape in which the diameter on the end face side is larger than the inner side.

  The magnet 1 includes a plurality of substantially square second notches 1b at substantially equal intervals in the circumferential direction on the outer peripheral side of the end surface opposite to the end surface where the first notches 1c are formed. In the example of FIG. 2, there are eight second notches 1b. The 2nd notch 1b is formed in the form which chamfers the corner | angular part of the outer peripheral side of the end surface on the opposite side to the end surface in which the 1st notch 1c was formed. As shown in FIG. 2A, the second notch 1b has a substantially square shape when viewed from the left side.

  The magnet 1 extends over the entire circumference at the corner on the outer peripheral side of the end surface (the end surface opposite to the impeller mounting portion 3a in the state of the rotor 100 of the pump motor) where the first notch 1c is formed. A chamfered taper portion 1a is provided.

  The operation of the taper portion 1a will be described. As described above, in the conventional pump motor, since the seal box is interposed between the magnetic pole position detecting element and the magnet 1, the distance between the magnetic pole position detecting element and the magnet 1 is increased, and the position of the rotor is increased. There was a problem that the detection accuracy was lowered.

  For example, a magnetic pole position detection element 50 (see FIG. 5) using a Hall element detects the surface magnetic flux on the end face of the magnet 1. When there is no taper part 1a, the surface magnetic flux density of the end surface of the magnet 1 decreases as the distance from the end surface of the magnet 1 increases, and the vicinity of the outer periphery of the magnet 1 is maximum in the radial direction. Therefore, when there is no taper part 1a, the position of the magnetic pole position detecting element 50 is as close as possible to the outer periphery of the magnet 1 in the radial direction and as close to the end face of the magnet 1 as possible in the axial direction. In this case, the seal box 10 is interposed between the end face of the magnet 1 and the magnetic pole position detection element 50. Accordingly, the distance from the end face of the magnet 1 to the magnetic pole position detecting element 50 is increased. The axial length of the pump motor is also increased.

  By providing the taper portion 1a, the radial position where the surface magnetic flux density of the end face of the magnet 1 becomes maximum tends to move from the outer periphery of the magnet 1 to the radially outer side.

  Accordingly, the position of the magnetic pole position detecting element 50 can be moved from the vicinity of the outer periphery of the magnet 1 to the radially outer side. For example, in order to shorten the axial length of the pump motor, the magnetic pole position detection element 50 is arranged so as to overlap the seal box 10 in the axial direction (the magnetic pole position detection element 50 is moved in the radial direction from the outer periphery of the magnet 1. The magnetic pole position detecting element 50 can be arranged at a radial position where the surface magnetic flux density of the end face of the magnet 1 is maximized even if they are arranged on the same plane perpendicular to the axial direction.

  Next, integral molding of the rotor 100 of the pump motor with the thermoplastic resin will be described.

  A mold for integrally molding the magnet 1 and the sleeve 2 includes an upper mold and a lower mold. First, the sleeve 2 is set in the lower mold. Since the cross-sectional shape of the sleeve 2 is symmetric, it can be set in the mold without matching the circumferential direction. Therefore, the work process is simplified, the productivity is improved, and the manufacturing cost can be reduced.

  When the sleeve 2 is set in the lower mold, the inner diameter of the sleeve 2 is held in the sleeve insertion portion provided in the lower mold, thereby ensuring the accuracy of the coaxiality between the sleeve 2 and the magnet 1 set in the subsequent process. The

  After the sleeve 2 is set in the lower mold, the magnet 1 has a tapered shape provided on the inner diameter of one end surface of the magnet 1 (the end surface opposite to the impeller mounting portion 3a in the state of the rotor 100 of the pump motor). The first notch 1c is fitted into a positioning protrusion provided on the lower mold and set. In the example of FIG. 2, there are eight first cutouts 1 c, and four of them are fitted with positioning protrusions at intervals of approximately 90 °. The reason why the eight first cutouts 1c are provided is to improve workability when the magnet 1 is set in the lower mold.

  Furthermore, the notch holding part which the left-right slide mechanism provided in the upper mold has on the outer peripheral part of the other end face of the magnet 1 (the end face on the impeller mounting part 3a side in the state of the rotor 100 of the pump motor). It presses against the formed substantially square-shaped 2nd notch 1b from radial direction. Thereby, the positional relationship and coaxiality of the sleeve 2 and the magnet 1 are ensured. In the example of FIG. 2, there are a total of eight substantially square-shaped second notches 1 b of the magnet 1, and two left and right slide mechanisms provided in the upper mold have two at approximately 180 ° intervals. The notch holding part is pressed. The reason why there are eight second notches 1b is to improve workability when setting the upper die.

  Even when there is a gap between the insertion portion of the lower mold magnet 1 and the outer diameter of the magnet 1, the notch holding portion of the left and right slide mechanism provided on the upper die is the inner diameter holding portion (positioning protrusion). By securing the coaxiality, it is possible to secure the positional relationship between the sleeve 2 and the magnet 1 and the coaxiality, and the quality can be improved.

  Conversely, by creating a gap between the insertion portion of the lower mold magnet 1 and the outer diameter of the magnet 1, the workability of setting the magnet 1 in the mold is improved, and the manufacturing cost is reduced.

  After the magnet 1 and the sleeve 2 are set in a mold, a thermoplastic resin such as PPE (polyphenylene ether) is injection-molded to form the resin portion 3, and the rotor 100 of the pump motor is formed. At this time, notches that cannot be held by the mold of the magnet 1, that is, four first notches 1 c and six second notches 1 b are embedded in the resin portion 3 of the thermoplastic resin, and rotational torque. It becomes the transmission part.

  After the magnet 1 and the sleeve 2 are integrally formed of a thermoplastic resin, the magnet 1 is magnetized, but the inner surface of the end of the magnet 1 opposite to the impeller mounting portion 3a of the rotor 100 of the pump motor. By using the second recesses 3d (four locations in FIG. 1) formed on the peripheral surface for positioning at the time of magnetization, accurate magnetization can be performed.

As described above, according to the present embodiment, the following effects can be obtained.
(1) In the state of the rotor 100 of the pump motor, the magnet 1 is provided with a tapered portion 1a that is chamfered over the entire circumference at the corner on the outer peripheral side of the end surface opposite to the impeller mounting portion 3a. Therefore, the radial position where the surface magnetic flux density on the end face of the magnet 1 is maximum moves from the vicinity of the outer periphery of the magnet 1 to the radially outer side. Therefore, the position of the magnetic pole position detecting element 50 can be moved from the vicinity of the outer periphery of the magnet 1 to the outside in the radial direction so that the magnetic pole position detecting element 50 and the seal box 10 can be arranged so as to overlap in the axial direction. The axial length of the electric motor can be shortened as compared with the case where there is no tapered portion 1a. Further, for example, in order to shorten the axial length of the pump motor, when the magnetic pole position detection element 50 is arranged so as to overlap the seal box 10 in the axial direction (the magnetic pole position detection element 50 has a diameter from the outer periphery of the magnet 1). The magnetic pole position detecting element 50 can be disposed at a radial position where the surface magnetic flux density of the end face of the magnet 1 is maximized.
(2) At the time of integral molding of the rotor 100 of the pump motor with the thermoplastic resin, the notch holding portion of the left and right slide mechanism provided in the upper mold is in the state of the rotor 100 of the pump motor of the magnet 1 The positional relationship and the coaxiality of the sleeve 2 and the magnet 1 are ensured by pressing against the substantially square second notch 1b formed on the outer peripheral portion of the end surface on the impeller mounting portion 3a side.
(3) After the magnet 1 and the sleeve 2 are set in the mold, a thermoplastic resin such as PPE (polyphenylene ether) is injection-molded to form the rotor 100 of the pump motor. Since the notches that cannot be pressed by the metal mold, that is, the four first notches 1c and the six second notches 1b are embedded in the resin portion 3 of the thermoplastic resin, the resin from the magnet 1 The rotational torque can be reliably transmitted to the portion 3.
(4) When the magnet 1 is magnetized, second recesses 3d (four locations in FIG. 1) formed on the inner peripheral surface of the end surface of the magnet 1 opposite to the impeller mounting portion 3a of the rotor 100 of the pump motor. Can be used for positioning at the time of magnetization, so that accurate magnetization can be achieved.

Embodiment 2. FIG.
3 and 4 are diagrams showing the second embodiment, and FIG. 3 is a diagram showing a rotor 100 of a pump motor (FIG. 3A is a cross-sectional view taken along the line CC in FIG. 3B, FIG. b) is a right side view), FIG. 4 is a diagram showing the magnet 1 (FIG. 4A is a left side view, FIG. 4B is a sectional view taken along the line DD in FIG. 4A, and FIG. 4C). Is a right side view).

  In the first embodiment, the notch holding portion of the left and right slide mechanism provided in the upper mold is formed on the outer peripheral portion of the end surface on the impeller mounting portion 3a side in the state of the rotor 100 of the pump motor of the magnet 1. The positional relationship between the sleeve 2 and the magnet 1 and the coaxiality are secured by pressing against the substantially square-shaped second notch 1b. In the present embodiment, however, the second notch 1b An alternative method is described.

  The magnet 1 of the present embodiment is formed in the rotor 100 of the pump motor, and has a tapered first notch 1c around the inner peripheral side of the end surface opposite to the impeller mounting portion 3a. The point provided with two or more at equal intervals in the direction is the same as Embodiment 1.

  Further, the resin portion 3 formed on the inner peripheral surface of the end surface of the magnet 1 opposite to the impeller mounting portion 3a is fitted with a positioning protrusion provided on the lower mold of the resin molding die. The point that the recess 3d is formed is also the same as in the first embodiment.

  The magnet 1 of the present embodiment has an outer peripheral corner portion of an end surface (the end surface opposite to the impeller mounting portion 3a in the state of the rotor 100 of the pump motor) where the first notch 1c is formed. The taper part 1a chamfered over the entire circumference is not formed. The form in which the taper part 1a does not exist may be sufficient.

  The magnet 1 according to the present embodiment replaces the substantially rectangular second notch 1b provided on the outer peripheral side of the end surface opposite to the end surface where the first notch 1c is formed in the first embodiment. A plurality of third notches 1d having a substantially semicircular cross-sectional shape extending in the axial direction are provided on the inner peripheral side of the end face opposite to the end face where the first notch 1c is formed.

  The 3rd notch 1d is formed in parallel with an axis | shaft (the shaft 5 (refer FIG. 5)). The inner peripheral surface of the magnet 1 has a draft angle of resin molding. For this reason, the third notch 1d has a larger depth in the radial direction and a width in the circumferential direction on the center side than the end face.

  As shown in FIG. 4, for example, four third notches 1d are provided at substantially equal intervals (approximately 90 °) in the circumferential direction. The third notch 1d is formed to extend from the end surface opposite to the end surface where the first notch 1c is formed to a substantially central portion of the inner peripheral surface of the magnet 1. The terminal end of the third notch 1d is a mold pressing portion 1e.

  At the time of integral molding of the rotor 100 of the pump motor with the thermoplastic resin, the sleeve 2 and the magnet 1 are set in the lower mold in the same manner as in the first embodiment. The upper mold includes pins for forming the counter holes 3b of the rotor 100 of the pump motor that is a finished product. In the example of FIG. 3, two counter holes 3b are provided at an interval of approximately 180 °, so two pins are necessary.

  In a state where the two pins of the upper mold are pressed against the mold pressing portion 1e located at the end of the third notch 1d of the magnet 1, integral molding with a thermoplastic resin is performed.

  Thereby, the positional relationship and the coaxial of the magnet 1 and the sleeve 2 can be ensured. The resin portion 3 is formed with two balancing holes 3b penetrating in the axial direction for reducing the pressure difference generated between the front and back of the impeller during pump operation. Here, an example in which the counter holes 3b are two is shown, but any number may be used.

  In the case of FIG. 1, the notch holding portions of the left and right slide mechanisms provided in the upper die are pressed against two of the substantially rectangular second notches 1 b of the magnet 1 at an interval of about 180 °. The resin portion 3 is formed with a first recess 3c at that location. This 1st recessed part 3c becomes a cause of the friction loss when the rotor 100 of the electric motor for pumps rotates in water. On the other hand, in the case of the rotor 100 of the pump motor shown in FIG. 3, the first recess 3c of the resin portion 3 by the notch holding portion of the upper left and right slide mechanism does not exist on the outer peripheral surface. The friction loss when the rotor 100 of the electric motor rotates in water can be reduced, and the performance of the pump is also improved.

  After the magnet 1 and the sleeve 2 are integrally formed of a thermoplastic resin, the magnet 1 is magnetized, but the inner surface of the end of the magnet 1 opposite to the impeller mounting portion 3a of the rotor 100 of the pump motor. Similar to the first embodiment, the second recesses 3d (four locations in FIG. 3) formed on the peripheral surface can be used for positioning at the time of magnetization to enable accurate magnetization.

As described above, according to the present embodiment, the following effects can be obtained.
(1) By integrally molding with a thermoplastic resin in a state where the two pins of the upper mold are pressed against the mold pressing portion 1e positioned at the end of the third notch 1d of the magnet 1, the magnet 1 And the coaxial relationship between the sleeve 2 and the sleeve 2 can be ensured.
(2) Moreover, since the rotor 100 of the pump electric motor of the present embodiment does not have the first recess 3c of the resin portion 3 by the notch holding portion of the upper left and right slide mechanism on the outer peripheral surface thereof, The friction loss when the rotor 100 of the pump motor rotates in water can be reduced, and the performance of the pump is also improved.
(3) When the magnet 1 is magnetized, the second concave portion 3d formed on the inner peripheral surface of the end surface of the magnet 1 opposite to the impeller mounting portion 3a of the rotor 100 of the pump motor is used for positioning during magnetization. By using it, it is possible to magnetize with high accuracy.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view illustrating the configuration of the pump 300 according to the third embodiment.

The pump 300 shown in FIG. 5 has the following configuration. That is, the pump 300
(A) It is manufactured by integrally molding a stator in which a plurality of coils are wound around a stator iron core in which electromagnetic steel plates are laminated, and a seal box 10 that is a resin molded product that partitions water and the stator in the pump 300. Mold stator 200,
(B) A shaft 5 that is manufactured using SUS, ceramic, or the like, one end of which is inserted into a shaft support portion 10a provided in the seal box 10 and the other end supported by a shaft support portion 20a of a casing 20 of a resin molded product. When,
(C) an impeller 15 of a resin molded product that is joined to the rotor 100 of the pump motor of Embodiment 1 or 2 by ultrasonic welding or the like and is rotatably installed around the shaft 5;
(D) a thrust bearing 6 made of SUS, ceramic, or the like, which is installed on both end faces of the sleeve 2 with a predetermined gap;
After the O-ring 60 is installed in the seal box 10, the casing 20, the mold stator 200, and the foot plate 32 are fastened together with a tapping screw 21 or the like and assembled.

  The mold stator 200 includes a substrate 40 on which a magnetic pole position detection element 50 is mounted at the end opposite to the impeller 15. And the lead wire 30 fixed with the lead wire holding | suppressing 31 from the board | substrate 40 is pulled out outside.

  For example, if the rotor 100 of the pump motor according to the first embodiment is used for the mold stator 200, the taper is obtained by chamfering the outer peripheral corner of the end face on the magnetic pole position detection element 50 side of the magnet 1 over the entire circumference. Part 1a exists. By arbitrarily changing the taper angle of the taper portion 1a, the peak position of the surface magnetic flux density on the end face of the magnet 1 can be arbitrarily changed in the radial direction.

  Therefore, as already described, for example, in order to shorten the axial length of the pump motor, the magnetic pole position detecting element 50 is arranged so as to overlap the seal box 10 in the axial direction (the magnetic pole position detecting element 50 is The magnetic pole position detecting element 50 can also be arranged at a radial position where the surface magnetic flux density on the end face of the magnet 1 is maximized.

  Further, for example, if the rotor 100 of the pump motor according to the second embodiment is used for the mold stator 200, the notch holding portion of the upper left and right slide mechanism on the outer peripheral surface of the rotor 100 of the pump motor. Since the first concave portion 3c of the resin portion 3 is not present, the friction loss when the rotor 100 of the pump motor rotates in water can be reduced, and the performance of the pump 300 is improved.

  When the rotor 100 of the pump motor according to the first or second embodiment is applied to the pump 300, the quality of the pump 300 improves as the accuracy of the rotor 100 of the pump motor improves, and the rotation of the pump motor rotates. By improving the productivity of the child 100, the cost of the pump 300 can be reduced.

Embodiment 4 FIG.
FIG. 6 is a diagram showing the fourth embodiment, and is a diagram showing a manufacturing process of the pump 300.

The manufacturing process of the pump 300 will be described with reference to FIG.
(1) Step 1: The magnet 1 is molded and demagnetized using a material in which a thermoplastic material is mixed with a magnetic material. In addition, the sleeve 2 is manufactured using a sintered carbon, a thermoplastic resin such as PPS containing carbon, a ceramic, or the like.
(2) Step 2: The sleeve 2 is set in the lower mold of an integral molding die made of thermoplastic resin of the rotor 100 of the pump motor.
(3) Step 3: The magnet 1 is set on the lower mold of the integral molding die made of the thermoplastic resin of the rotor 100 of the pump motor. After the sleeve 2 is set in the lower mold, the magnet 1 has a tapered shape provided on the inner diameter of one end surface of the magnet 1 (the end surface opposite to the impeller mounting portion 3a in the state of the rotor 100 of the pump motor). The first notch 1c is fitted into a positioning protrusion provided on the lower mold and set.
(4) Step 4: The magnet 1 is pressed by a pin for forming a notch holding part provided in the left and right slide mechanism provided in the upper mold or a counter hole 3b provided in the upper mold, and the pump is made of thermoplastic resin. An integral molding of the rotor 100 of the electric motor is performed.
(5) Step 5: Magnetize the magnet 1. In addition, the casing 20 is manufactured. In addition, the mold stator 200 is manufactured. Furthermore, each part required for the assembly of the pump 300 is prepared.
(6) Step 6: Assemble the pump 300.

  By the manufacturing process as described above, the rotor 100 and the pump 300 of the pump motor can be efficiently manufactured.

FIG. 2 shows the first embodiment and shows a rotor 100 of the pump motor (FIG. 1A is a cross-sectional view taken along the line AA in FIG. 1B, and FIG. 1B is a right side view). FIG. 2 is a diagram showing the first embodiment, and is a diagram showing the magnet 1 (FIG. 2 (a) is a left side view, FIG. 2 (b) is a cross-sectional view along BB in FIG. 2 (a), and FIG. Plan). FIG. 3 shows the second embodiment and shows a rotor 100 of the pump motor (FIG. 3 (a) is a cross-sectional view taken along the line CC in FIG. 3 (b), and FIG. 3 (b) is a right side view). FIG. 4 is a diagram showing the second embodiment, and is a diagram showing the magnet 1 (FIG. 4 (a) is a left side view, FIG. 4 (b) is a DD sectional view of FIG. 4 (a), and FIG. 4 (c) is a right side. Plan). FIG. 5 shows the third embodiment and is a cross-sectional view showing a configuration of a pump 300. FIG. 10 shows the fourth embodiment, and shows the manufacturing process of the pump 300.

Explanation of symbols

  1 magnet, 1a taper part, 1b second notch, 1c first notch, 1d third notch, 1e mold holding part, 2 sleeve, 3 resin part, 3a impeller mounting part, 3b balancing hole 3c 1st recess, 3d 2nd recess, 5 shaft, 6 thrust bearing, 10 seal box, 10a shaft support, 20 casing, 20a shaft support, 21 casing mounting screw, 30 lead wire, 31 lead wire presser , 32 foot plate, 40 substrate, 50 magnetic pole position detection element, 60 O-ring, 100 rotor of motor for pump, 200 mold stator, 300 pump.

Claims (7)

Mounted on a pump that partitions water and a mold stator having a substrate on which a magnetic pole position detecting element is mounted with a seal box, is rotatably accommodated in the seal box, one end faces the magnetic pole position detecting element, and others A rotor of a pump motor having an impeller mounting portion for attaching an impeller at an end,
A ring-shaped magnet and a sleeve disposed inside the magnet are integrally formed of a thermoplastic resin, and at the same time, the impeller mounting portion is formed of the thermoplastic resin,
The rotor of a pump motor, wherein the magnet includes a tapered portion chamfered at a corner portion on an outer peripheral side of an end portion facing the magnetic pole position detecting element.   The rotor of a pump motor according to claim 1, wherein the shape of the taper portion of the magnet is changed according to a position where the magnetic pole position detection element is provided. Mounted on a pump that partitions water and a mold stator having a substrate on which a magnetic pole position detecting element is mounted with a seal box, is rotatably accommodated in the seal box, one end faces the magnetic pole position detecting element, and others A rotor of a pump motor having an impeller mounting portion for attaching an impeller at an end,
A ring-shaped magnet and a sleeve disposed inside the magnet are integrally formed of a thermoplastic resin, and at the same time, the impeller mounting portion is formed of the thermoplastic resin,
The magnet includes a plurality of substantially square second cutouts at substantially equal intervals in the circumferential direction on the outer peripheral side of the end surface on the impeller mounting portion side,
When integrally molding with the thermoplastic resin, the notch holding portion of the left and right slide mechanism provided on the upper mold of the molding die is pressed against the second notch of the magnet from the radial direction. The rotor of the pump motor. Mounted on a pump that partitions water and a mold stator having a substrate on which a magnetic pole position detecting element is mounted with a seal box, is rotatably accommodated in the seal box, one end faces the magnetic pole position detecting element, and others An electric motor rotor for a pump having an impeller mounting portion for attaching an impeller at an end, and a plurality of counter holes provided in the axial direction for reducing a pressure difference generated on the front and back of the impeller during the pump operation Because
A ring-shaped magnet and a sleeve disposed inside the magnet are integrally formed of a thermoplastic resin, and at the same time, the impeller mounting portion is formed of the thermoplastic resin,
The magnet includes a plurality of third notches having a substantially semicircular cross-sectional shape extending in the axial direction on the inner peripheral side of the end surface on the impeller mounting portion side at substantially equal intervals in the circumferential direction,
The third cutout extends to a substantially central portion of the inner peripheral surface of the magnet, and a mold pressing portion is formed at the end of the third cutout,
When integrally molding with the thermoplastic resin, a pin for molding the counter hole provided in the upper mold of the molding die is pressed against the mold pressing portion of the third notch. The rotor of the pump motor.   A pump motor, comprising the rotor of the pump motor according to any one of claims 1 to 4.   A pump equipped with the pump motor according to claim 5. Mounted on a pump that partitions water and a mold stator having a substrate on which a magnetic pole position detecting element is mounted with a seal box, is rotatably accommodated in the seal box, one end faces the magnetic pole position detecting element, and others An electric motor rotor for a pump having an impeller mounting portion for attaching an impeller at an end, and a plurality of counter holes provided in the axial direction for reducing a pressure difference generated on the front and back of the impeller during the pump operation In the manufacturing method of
Molding and demagnetizing a magnet using a material in which a thermoplastic material is mixed with a thermoplastic resin, and manufacturing a sleeve using either sintered carbon, thermoplastic resin such as PPS containing carbon, ceramic, etc. ,
The sleeve is set in a lower mold of an integral molding die using a thermoplastic resin of a rotor of a pump electric motor,
The magnet is set on the lower mold of the integral molding die by the thermoplastic resin of the rotor of the pump motor,
The magnet is pressed by a notch holding portion provided in a left and right slide mechanism provided in the upper die of the integral molding die or a pin for forming a balancing hole provided in the upper die, and the thermoplastic resin is used to A method of manufacturing a rotor for a pump motor, wherein the rotor of the pump motor is integrally formed.

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