JPH10122176A - Motor-driven pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of constitutive part items, simplify an assembling process, reduce cost, and reduce an operation sound by providing a partition wall between a first magnet composed of a plastic magnet material installed on a motor driving shaft and an impeller having a second magnet enclosed in a pump chamber. SOLUTION: A first magnet 24 formed of a plastic magnet material mainly composed of powder of a ferromagnetic material and a resin material, is installed on and fixed to a motor driving shaft 23 of a motor 22. An impeller 29 to fix a second magnet 27 is rotatably installed through a rotary shaft 31 in a pump casing 30 after being magnitized, and the first magnet 24 and the second magnet 27 are opposed to each other through a partition wall 33, and a pump 35 is constituted. The pump 35 rotates the impeller 29 enclosing the second magnet 27 through the first magnet 24 by rotary operation, and sucks and delivers liquid from an inflow port 36 and an outflow port 37. As a result, an assembling process such as adhesion and magnetization is obviated, and the number of part items is reduced, and magnetization is obviated after molding, and vibration and an operation sound can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating a stored liquid.
The present invention relates to an electric pump used for an electric water heater for keeping heat.

[0002]

2. Description of the Related Art Conventionally, an electric pump shown in FIG. 5 is known. In other words, a metal motor drive shaft 3 having a high surface hardness of the motor 2 fixed to the motor base 1
Then, the first magnet 4 bonded to the first magnetic pole plate 5 with an adhesive or the like is magnetized in a magnetizing step and then pressed and fixed. on the other hand,
The impeller 10 in which the second magnetic pole plate 7 and the second magnet 8 are fixed to the first impeller cover 6 by ultrasonic welding or the like with the second impeller cover 9 is magnetized in a magnetizing process.
A pump chamber 15 is rotatably mounted in a pump case 11 via a rotary shaft 12, and a pump chamber 15 is formed in a liquid-tight manner by a partition 14 via an O-ring 13, and the first magnet 4 and the second magnet 4 are formed via the partition 14. The magnet 8 is configured to be opposed to the first impeller cover 6 and the plurality of blades 16 are integrally formed.

[0003]

However, in the above-mentioned conventional configuration, the first magnet bonded to the first magnetic pole plate 5 with an adhesive or the like is pressed into the motor drive shaft after being magnetized in the magnetizing step. Since the structure is fixed, the number of components is large, and in order to stabilize the press-fit load of the press-fit portion of the first magnetic pole plate and the motor drive shaft, since the press-fit portion is made of metal, very tight dimensional tolerances Management is required, and furthermore, processes such as magnetization and bonding are required, which complicates assembly and further increases costs.

[0004] Further, the second magnetic pole plate and the second magnet are sandwiched between the first impeller cover by the second impeller cover, assembled, welded and fixed by ultrasonic welding or the like to form an impeller. Since it is magnetized in the magnetizing step, the number of constituent parts is large, and furthermore, steps such as magnetizing and ultrasonic welding are required, which complicates the assembly and further increases the cost.

Further, when the first magnet is adhered to the first magnetic pole plate with an adhesive or the like, the impeller is also composed of four parts, so that the impeller is rotated at the time of rotation due to misalignment or looseness of the built-in parts. The dynamic balance deteriorated, and the operating noise caused by the vibration was increased.

The present invention solves such a conventional problem, and simplifies the configuration of a magnet and an impeller constituting an electric pump to reduce the number of components, and furthermore, assembles such as magnetizing and ultrasonic welding. This simplifies the process, reduces costs and lowers operating noise.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an impeller having a first magnet mounted on a motor drive shaft and a second magnet built in a pump chamber.
An electric pump having a partition wall located between the first magnet and the impeller, wherein the first magnet is made of a plastic magnet material. This allows
The structure is simplified to reduce the number of constituent parts, and furthermore, the assembling processes such as bonding, assembling, ultrasonic welding, and magnetizing are simplified and cost is reduced. Further, the dynamic balance at the time of rotation is good, and vibration is suppressed to reduce operation noise.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above, the invention according to claim 1 comprises an impeller having a first magnet mounted on a motor drive shaft and a second magnet built in a pump chamber.
An electric pump having a partition wall located between the first magnet and the impeller, wherein the first magnet is made of a plastic magnet material.

According to a second aspect of the present invention, there is provided an impeller having a first magnet mounted on a motor drive shaft, a second magnet incorporated in a pump chamber, and a first magnet between the first magnet and the impeller. And an impeller blade portion and a bearing portion are integrally formed of a plastic magnet material.

According to a third aspect of the present invention, there is provided an impeller having a first magnet mounted on a motor drive shaft, a second magnet housed in a pump chamber, and a space between the first magnet and the impeller. The impeller blades are integrally formed of a plastic magnet material, and the bearings of the impeller are made of a high sliding material.

[0011] According to a fourth aspect of the present invention, there is provided an impeller having a first magnet mounted on a motor drive shaft, a second magnet built in a pump chamber, and an impeller between the first magnet and the impeller. The first magnet and the impeller blades are formed of a plastic magnet material, and the bearing is an electric pump formed of a high sliding material.

According to a fifth aspect of the present invention, there is provided an impeller having a first magnet mounted on a motor drive shaft, a second magnet built in a pump chamber, and an impeller between the first magnet and the impeller. And an electric pump in which the first magnet and the impeller are formed of a plastic magnet material, and the impeller blades and the bearing are integrally formed.

According to a sixth aspect of the present invention, the plastic magnet material comprises a ferrite magnetic material, an alnico magnetic material,
At least one of a samarium-cobalt-based magnetic material, a neodymium-iron-boron-based magnetic material, and a polyamide resin
It contains at least one of polyphenylene sulfide resin and polypropylene resin.

According to a seventh aspect of the present invention, the first magnet is press-fitted and fixed to a motor drive shaft.

According to an eighth aspect of the present invention, the first magnet is partially magnetized.

As described above, the plastic magnet material is used for the magnet on the motor side and the magnet on the impeller side, and by adopting the magnetic field forming method of magnetizing simultaneously with forming,
The structure is simplified, the number of component parts is reduced, and
Simplify the processing steps such as magnetizing and ultrasonic welding, reduce costs, and because it is integrally molded, there is no displacement of the center of gravity due to displacement between the components of the magnet and impeller, so the dynamic balance during rotation is good and vibration The operation noise can be reduced with less occurrence.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIG. In the figure, a first magnet 24 is mounted and fixed to a metal motor drive shaft 23 having a high surface hardness of a motor 22 fixed to a motor base 21. The first magnet 24 is formed of a plastic magnet material mainly composed of a ferromagnetic material powder and a resin material. Examples of the ferromagnetic material powder include ferrite, alnico, samarium-cobalt, A neodymium-iron-boron system or the like may be used, and the resin material may be a polyamide resin, a polyphenylene sulfide resin, a polypropylene resin, or the like.
It is formed of a plastic magnet material containing the ferromagnetic powder and resin as main components, and is molded and magnetized by magnetic field molding that can be magnetized simultaneously with molding.

On the other hand, an impeller 29 in which an impeller magnetic pole plate 26 and a second magnet 27 are fixed with a second impeller cover 28 by ultrasonic welding or the like is attached to a first impeller cover 25 integrally formed with a plurality of blades. After being magnetized in the magnetizing step, the magnet is rotatably mounted in the pump case 30 via the rotating shaft 31,
The pump chamber 3 is made liquid-tight by the partition wall 33 via the O-ring 32.
4 is formed, and the pump 35 is configured such that the first magnet 24 and the second magnet 27 face each other with the partition wall 33 interposed therebetween.

In the magnetized specification of the magnet 24 and the impeller 29, at least one pair of the N pole and the S pole is magnetized to transmit rotation.

Next, the operation of this embodiment will be described. The pump 35 rotates the motor 22 by rotating the impeller 29, which is transmitted by magnetic force and forms a plurality of blades, to the second magnet 27 built in the impeller 29 via the first magnet 24, and A liquid such as hot water or water is sucked in from 36 and sent out from an outlet 37.

As is apparent from the above configuration, since the first magnet 24 is integrally formed of a plastic magnet material, no magnetic pole plate is required, so that the bonding step is not required, the number of parts is small, and the magnetizing and magnetizing are performed simultaneously. Since it is magnetized at the same time as molding due to possible magnetic field molding, there is no need for a new magnetizing step, cost reduction can be achieved, and vibration is caused by deterioration of dynamic balance during rotation due to misalignment at the time of bonding due to integral molding. Since there is no generation, that is, an increase in the operation sound, the operation sound can be reduced.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. In the figure, an impeller 38 having a magnetic force built in a pump chamber 34 and a first magnet 40 mounted on a motor drive shaft 23 via a magnetic pole plate 39 are connected to a motor via a partition 33 of the pump chamber 34. The rotation of the motor 22 is transmitted to the impeller 38 by magnetic coupling, and the blade 41 and the bearing 42 of the impeller 38 are integrally formed of a plastic magnet material. The impeller 38 is magnetized simultaneously with molding. It was done.

With the above-described structure, the blade portion 41 and the bearing portion 42 of the impeller 38 are integrally formed of a plastic magnet material. Since it can be composed of parts, the number of parts is small, assembly after molding and ultrasonic welding are not required, and magnetization can be performed at the same time as molding, eliminating the need for a magnetizing step, simplifying the manufacturing process. The cost can be further reduced. Further, since the blade portion 41 and the bearing portion 42 of the impeller 38 are integrally formed of a plastic magnet material, the dynamic balance at the time of rotation due to the displacement of the center of gravity after assembly and ultrasonic welding is deteriorated, and the vibration is reduced. Does not occur and the operation sound does not increase, so that the operation sound can be reduced.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG. In the drawing, an impeller 44 having a magnetic force built in a pump chamber 34 and a motor drive shaft 2
And a first magnet 40 mounted on the motor 3 via a magnetic pole plate 39 and a partition 33 of the pump chamber 34 for transmitting the rotation of the motor 22 to the impeller 44 by magnetic coupling. The portion 45 is integrally formed of a plastic magnet material, and the bearing portion 46 is formed of a composite material with a fluorine resin or a high sliding material such as a polypropylene resin.

With the above configuration, in addition to the effects of the fifth embodiment, the bearing 46 of the impeller 44 is formed of a separate member made of a high-sliding material, so that the life of the pump 47 is further extended. Can be done.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to FIG. 4A, the first magnet 24 mounted on the motor drive shaft 23 and the impeller 44 having a magnetic force built in the pump chamber 34 are connected to the motor 22 via the partition wall 33 of the pump chamber 34. 4 is transmitted to the impeller 44 (or the impeller 38 of FIG. 4B) by magnetic coupling, and the first magnet 24 and the impeller 44 (or the impeller of FIG. 38) is formed of a plastic magnet material, and the impeller 44 is formed.
The blade portion 45 is integrally formed of a plastic magnet material, and the bearing portion 46 is formed of a high sliding material.

Here, as shown in FIG. 4B, the blade portion 41 and the bearing portion 42 of the impeller 38 may be formed integrally with a plastic magnet material.

With the above structure, the magnet and the impeller are each independently formed into a plastic magnet, thereby reducing the number of parts, reducing the cost of assembling, assembling, welding and magnetizing, and reducing the cost. In addition to the reduction of the operation noise due to the stability, the following effects are further obtained by forming both into plastic magnets.

In other words, the magnet 24 can be used as a magnet from the current donut shape to the vicinity of the center of rotation, and can also be used as a magnet in a thickness direction in a portion corresponding to a magnetic pole plate. And the attraction between the two magnets can be increased.
On the other hand, the impeller can increase the attractive force because the distance between the magnets in FIG. 1 can be reduced from the dimension a to the dimension b. The combination of the above two can further increase the suction force.

In the case of an actual pump, it is not necessary to increase the suction force, so that the size of the two plastic magnets can be further reduced as compared with the case where the plastic magnets are used alone.
Vibration during rotation due to weight reduction can be suppressed, and operation noise can be reduced.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described with reference to FIG. In the figure, the ferromagnetic material powder is any of ferrite, alnico, samarium-cobalt, neodymium-iron-boron, and the resin component is a polyamide resin, polyphenylene sulfide resin, or polypropylene resin. The first magnet 24 made of a plastic magnet material described above is mounted on the motor drive shaft 23.

With the above structure, in addition to the effects of the first embodiment, since a plastic magnet material containing a resin material having high heat resistance as a main component is employed, a pump using hot water such as an electric water heater has excellent durability. Can be provided.

In FIGS. 2 and 3, the pump 43
The 47 impellers 38 and 44 have a ferromagnetic material powder of any of ferrite, alnico, samarium-cobalt, neodymium-iron-boron, and a resin component of polyamide resin, polyphenylene sulfide resin or polypropylene. Even if it is made of a plastic magnet material mainly composed of a resin material having high heat resistance and water resistance, it is possible to use an impeller 38 made of a plastic magnet material mainly composed of a resin material having excellent heat resistance and water resistance. 44
Therefore, even a pump handling hot water such as an electric water heater can be provided with excellent durability.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described with reference to FIG. In the figure, the motor drive shaft 23
First magnet 2 made of plastic magnet material attached to
4 is partially magnetized by magnetic field shaping, and the surface magnetic flux density of the surface B side of the drawing, that is, the surface of the first magnet 24 facing the motor 22 is reduced to the surface A side, that is, the surface of the surface facing the second magnet 27. This is suppressed to 70% or less of the magnetic flux density.

With the above configuration, in addition to the effects of the first embodiment, the leakage magnetic flux on the B surface side is small, so that the adverse effect due to the magnetic force to the vicinity is suppressed. Unnecessary adsorption phenomena can be suppressed and efficient assembly can be performed.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described with reference to FIG. In the figure, a first magnet 24 made of a plastic magnet material is press-fitted and fixed to a motor drive shaft 23.

With the above configuration, in addition to the effects of the first embodiment, in the prior art, since the press-fitted portions were made of metal, slight dimensional variations caused large variations in the press-fitting load. Therefore, the press-fitting load to the metal motor drive shaft 23 does not require strict dimensional tolerance management at the press-fitted portion compared to the metal, and the press-fitting load can be stabilized.

[0039]

As apparent from the above embodiment, according to the first aspect of the present invention, the first magnet mounted on the motor drive shaft is made of a plastic magnet material.
No assembly process such as bonding or magnetization is required, and the number of parts is small.
In addition, since it is magnetized simultaneously with molding by magnetic field molding that can be magnetized at the same time as molding, there is no need to re-magnetize after molding, and since it is an integral molding with no center deviation at the time of bonding, dynamic balance during rotation is improved. Therefore, the vibration can be reduced and the operation sound can be reduced.

According to the second aspect of the present invention, since the impeller blades and the bearing are integrally formed of a plastic magnet material, the impeller has a structure different from that of the prior art having four parts. Since it can be composed of one part,
Since the number of parts is small, assembly after molding, ultrasonic welding, and the like are unnecessary, and magnetization can be performed at the same time as molding, so that a magnetization step is not required, so that the manufacturing process can be simplified and costs can be reduced.

According to the third aspect of the present invention, the blade of the impeller is integrally formed of a plastic magnet material, and the bearing of the impeller is formed of a high sliding material. Can be lengthened.

According to the fourth aspect of the present invention, the first magnet and the blade of the impeller are formed of a plastic magnet material, and the bearing is formed of a high sliding material. The magnet can be used as a magnet from the current donut shape to the vicinity of the center of rotation, and it can also be used as a magnet in the thickness direction as well as the part corresponding to the magnetic pole plate. The suction force between them can be increased. Further, since the impeller can make the distance between the magnets in FIG. 1 closer from the dimension a to the dimension b, the attraction force can be increased.

With the combination of the above two, the suction force can be further increased. For an actual pump,
Since it is not necessary to increase the suction force, the size of the two plastic magnets can be further reduced as compared to the case where the plastic magnets are used alone, further reducing costs and suppressing vibration during rotation due to weight reduction, and reducing operating noise. It can be made smaller.

According to the fifth aspect of the present invention, the first magnet and the impeller are formed of a plastic magnet material, and the impeller blade and the bearing are integrally formed. Can be used as a magnet from the current donut shape to the vicinity of the center of rotation, and it can also be used as a magnet in the thickness direction, as well as the portion corresponding to the pole plate, so that the magnetic force can be sufficiently exhibited in a limited space and between the two magnets Suction force can be increased.
In addition, the distance between the magnets in FIG.
Since the dimensions can be approached, the suction force can be increased.

By the combination of the above two, the suction force can be further increased. For an actual pump,
Since it is not necessary to increase the suction force, the size of the two plastic magnets can be further reduced as compared to the case where the plastic magnets are used alone, further reducing costs and suppressing vibration during rotation due to weight reduction, and reducing operating noise. It can be made smaller.

According to the sixth aspect of the present invention, the plastic magnet material includes at least one of a ferrite-based magnetic material, an alnico-based magnetic material, a samarium-cobalt-based magnetic material, a neodymium-iron-boron-based magnetic material. It is characterized by containing at least one of a polyamide resin, a polyphenylene sulfide resin and a polypropylene resin, so that a pump having excellent durability can be provided even with a pump using hot water such as an electric water heater.

According to the seventh aspect of the present invention, since the first magnet is press-fitted and fixed to the motor drive shaft, the first magnet is made of a plastic magnet material. As for the press-fit load at the time of press-fitting, the press-fit portion does not require strict dimensional tolerance management as compared with metal, and the press-fit load can be stabilized.

According to the eighth aspect of the present invention, the first magnet is characterized by being partially magnetized.
As compared with the surface side (the surface facing the second magnet), the leakage magnetic flux on the surface B side (the surface facing the motor of the first magnet) is smaller, so that the adverse effect due to the magnetic force in the vicinity is suppressed. An unnecessary assembling phenomenon to other parts due to the leakage magnetic flux on the surface side is suppressed, and efficient assembly can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric pump showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of an electric pump showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view of an electric pump showing still another embodiment of the present invention.

FIG. 4A is a sectional view of an electric pump showing still another embodiment of the present invention. FIG. 4B is a sectional view showing an embodiment in which the blade portion and the bearing portion of the electric pump are integrated.

FIG. 5 is a sectional view of a conventional electric pump.

[Explanation of symbols]

 Reference Signs List 22 motor 23 motor drive shaft 24 first magnet 27 second magnet 29, 38, 44 impeller 33 partition wall 34 pump chamber 41, 45 blade section 42, 46 bearing section

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shogo Okugawa 862-Hatashiro Nakashiroji, Daino-cho, Aki-gun, Mie Prefecture

Claims (8)

[Claims] 1. A first magnet mounted on a motor drive shaft,
An electric pump having an impeller having a second magnet built in a pump chamber, and a partition located between the first magnet and the impeller, wherein the first magnet is formed of a plastic magnet material . 2. A first magnet mounted on a motor drive shaft,
An impeller having a second magnet built in the pump chamber, and a partition wall located between the first magnet and the impeller, wherein a blade portion and a bearing portion of the impeller are made of a plastic magnet material. An integrated electric pump. 3. A first magnet mounted on a motor drive shaft,
An impeller having a second magnet built in the pump chamber, and a partition located between the first magnet and the impeller, and a blade portion of the impeller is integrally formed of a plastic magnet material. The electric pump is made of high-sliding material for the bearing of the impeller. 4. A first magnet mounted on a motor drive shaft,
An impeller having a second magnet built in a pump chamber, and a partition located between the first magnet and the impeller, wherein the first magnet and a blade of the impeller are provided. An electric pump made of plastic magnet material and bearing parts made of high sliding material. 5. A first magnet mounted on a motor drive shaft,
An impeller having a second magnet built in a pump chamber, and a partition located between the first magnet and the impeller, wherein the first magnet and the impeller are made of a plastic magnet material. An electric pump in which the impeller blades and the bearing are integrally formed. 6. The plastic magnet material is at least one of a ferrite-based magnetic material, an alnico-based magnetic material, a samarium-cobalt-based magnetic material, a neodymium-iron-boron-based magnetic material, and a polyamide resin, a polyphenylene sulfide resin or a polypropylene resin. The electric pump according to any one of claims 1 to 5, further comprising at least one of the following. 7. The electric pump according to claim 1, wherein the first magnet is press-fitted and fixed to a motor drive shaft. 8. The electric pump according to claim 1, wherein the first magnet is partially magnetized.