WO2011145844A2

WO2011145844A2 - Fluid pump having waterproof structure

Info

Publication number: WO2011145844A2
Application number: PCT/KR2011/003576
Authority: WO
Inventors: 김병수
Original assignee: 주식회사 아모텍
Priority date: 2010-05-19
Filing date: 2011-05-16
Publication date: 2011-11-24
Also published as: WO2011145844A3; US20130064695A1; KR101237023B1; KR20110127311A

Abstract

The fluid pump of the present invention includes: a first housing and a second housing coupled with each other; a supporting shaft fixed to the second housing; an impeller received in the first housing which pumps fluid; a stator fixed to the second housing; a first rotor arranged inside the second housing, rotatably supported by the supporting shaft, and disposed in the second housing to face one side surface of the stator; and a second rotor fixed to the impeller and disposed to face the other side surface of the stator. It is possible to realize a slim structure by employing an axial type BLDC motor as a motor for driving the impeller and to improve the waterproof performance of the motor by forming the stator of the motor to be buried in the housing.

Description

Water resistant fluid pump

The present invention relates to a waterproof fluid pump that can block the flow of fluid, such as water into the motor at the source.

Generally, a water pump motor is used as a driving source of a water pump used to drive a water pump installed in a drainage tank of a washing machine or to supply cooling water to an engine. A water pump equipped with such a water pump motor is always fitted directly with water. It works in the environment it touches.

Therefore, a motor pump or stator having a mechanical seal structure for the purpose of protecting the motor from water when water inside the water pump is drained to the outside or to prevent bearing failure, belt life shortening, etc. due to cooling water leakage. Canned motor pump (canned motor pump) having a can cover structure for sealing the is used.

In the U.S. Patent No. 4,277,115, which proposes the canned motor pump, since the can cover covers only the stator, water is immersed in the rotor, which adversely affects the durability of a bearing supporting the rotating shaft, and a can cover disposed between the rotor and the stator. As a result, the magnetic gap cannot be optimally maintained, resulting in a problem of low efficiency.

In addition, the canned motor pump has a problem in that water is submerged in the rotor and thus affects the rotation of the rotor, thereby degrading motor efficiency.

Moreover, the conventional canned motor pump structure has a problem that the assembly productivity is low because the impeller's rotary shaft is integrally formed with the rotary shaft of the motor and thus the motor and the pump unit cannot be assembled and tested, respectively.

In addition, the can cover of the canned motor pump has a problem in that it is not easy to be combined with the stator core when assembling the stator by forming a PPS material.

In addition, conventionally, the molding cost is increased by inserting the exterior of the stator using a bulk mold compound (BMC) and simultaneously adopting a double sealing structure by a sealing cover for PPS material.

Accordingly, an object of the present invention is to provide a fluid pump that can realize a slim structure by employing an axial type coreless BLDC motor as a drive motor for driving an impeller.

Another object of the present invention is to provide a fluid pump capable of blocking the inflow of water into the motor while suppressing axial vibration by adopting a double rotor structure in an axial type coreless BLDC motor.

Still another object of the present invention is to form a coreless stator and a support shaft integrally with the pump housing so that a separate waterproofing process can be omitted, thereby setting the magnetic gap between the rotor and the stator of the drive motor to an optimal state. An object of the present invention is to provide a fluid pump capable of improving efficiency.

Still another object of the present invention is to provide a fluid pump capable of sealing the driving motor without any additional device, thereby reducing the manufacturing cost.

As described above, the fluid pump includes a first housing and a second housing coupled to each other, a support shaft fixed to the second housing, an impeller accommodated in the first housing and pumping fluid; A stator fixed to the second housing, a first rotor disposed inside the second housing, rotatably supported on the support shaft, and disposed to face one side of the stator, and fixed to the impeller, And a second rotor disposed to face the other side.

The support shaft is formed integrally with an insert molding on the upper plate of the second housing, the upper side is located inside the first housing, the lower side is located inside the second housing.

A driver for applying a driving signal to the stator is accommodated in the second housing.

The stator is characterized in that the coreless type.

The stator may be integrally fixed to the upper plate of the second housing by insert molding.

The first rotor and the second rotor includes a plurality of magnets composed of divided pieces or ring magnets in which the N pole and the S pole are divided and magnetized.

The first rotor and the second rotor is characterized in that the surfaces facing each other are arranged to have the opposite polarity.

The first rotor includes a rotor support rotatably supported by a support shaft positioned inside the second housing, a plurality of magnets fixed to the rotor support, and an annular back yoke formed on a rear surface of the magnet.

The second rotor is a rotor support rotatably supported on a support shaft located inside the first housing and fixed to an impeller, a plurality of magnets fixed to the rotor support, and an annular bag formed on a rear surface of the magnet. Contains yoke.

The first rotor and the second rotor is characterized in that rotatably supported on the support shaft by a sleeve bearing.

As described above, the fluid pump of the present invention can realize a slim structure having a size of 1/2 compared to the core type drive motor by employing an axial type coreless BLDC motor as a drive motor for driving the impeller.

In addition, the fluid pump of the present invention can suppress axial vibration by employing a double rotor structure in an axial type coreless BLDC motor.

In addition, the fluid pump of the present invention integrally forms the coreless stator and the support shaft in the pump housing, integrally forms the first rotor with the impeller, and arranges the second rotor outside the pump housing so that water flows into the drive motor. Can be blocked.

Furthermore, in the present invention, by separately forming the coreless stator and the support shaft in the pump housing, a separate waterproofing process can be omitted, thereby setting the magnetic gap between the rotor and the stator of the drive motor to an optimal state and thus improving the efficiency of the motor. Can improve.

In addition, in the present invention, it is possible to seal the motor without a separate waterproof structure such as a canned cover for sealing can reduce the manufacturing cost.

1 is an axial cross-sectional view of a fluid pump according to an embodiment of the present invention.

FIG. 2 is a view showing a disposition relationship between a coil of a stator and a magnet of a rotor in a motor employed in the fluid pump of FIG. 1.

3 is a cross-sectional view of the stator of the motor of FIG. 1.

4 is a plan view of the rotor of the motor of FIG.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a cross-sectional view of a fluid pump according to an embodiment of the present invention, FIG. 2 is a view showing an arrangement relationship between a coil of a stator and a magnet of a rotor in a motor employed in the fluid pump of FIG. 1, and FIG. 3 is FIG. 1. Is a cross-sectional view of the stator of the motor of FIG. 4, and FIG. 4 is a plan view of the rotor of the motor of FIG.

1 to 4, a fluid pump according to an embodiment of the present invention includes a pump housing 10, a motor 1, and an impeller 43.

The pump housing 10 may be sealed to an open lower side of the first housing 15 having the inlet 15a through which the fluid is introduced and the outlet 15b through which the fluid is discharged, and the first housing 15. And a second housing 14 to be mounted.

The motor 1 and the driver 36 for driving the motor 1 are built in the second housing 14, and the cover 11 is sealably coupled to the open lower side of the second housing 14. do.

At least three

fixing extension parts

11b and 14b protrude between the cover 11 and the second housing 14 to fasten the fixing screw or the fixing bolt to the coupling hole, and the cover 11 The cylindrical protrusion 11a protrudes from the upper side of the cover 11 between the second housing 14 and the sealing O-ring 35a is inserted into the outer circumferential surface of the second housing 14.

At least three fixing extension parts 14c and 15d protrude from each other between the second housing 14 and the first housing 15 so that the fixing screws or fixing bolts may be fastened to the coupling holes. In addition, a sealing O-ring 35b is inserted into a recess formed in the outer circumferential surface of the second housing 14 to seal between the first housing 15 and the second housing 14.

An inlet 15a through which fluid is introduced is formed in the upper center of the first housing 15, and an outlet 15b through which the pumped fluid is discharged is formed at a side of the first housing 15, and an inlet 15a and the inlet 15a. An impeller 43 is disposed in the fluid flow passage P between the outlets 15b.

The first housing 15 is extended so that an open bottom has a wider space than the inlet 15a so that the impeller 43 can be disposed in the fluid flow passage P. FIG.

An insertion portion 14d inserted into the lower inner surface of the first housing 15 is formed above the second housing 14.

The impeller 43 has a disk-like body 43a and a plurality of wings radially formed in the body 43a to discharge fluid such as water flowing from the inlet 15a through the outlet 15b disposed on the side. (43b).

The support shaft 27 is integrally formed by being embedded in the upper plate 14a of the second housing 14 at the time of insert molding in order to mold the second housing 14.

Therefore, since the support shaft 27 is integrally formed with the upper plate 14a of the second housing 14, the fluid may be blocked from flowing into the inner space of the second housing 14.

The lower end of the support shaft 27 is inserted into the press-in portion 11c formed in the center of the cover 11, and the stopper 44 is coupled to the upper end of the support shaft 27 to prevent the impeller 43 from being separated. .

Meanwhile, in the present invention, an axial including a coreless stator 26 and

double rotors

20 and 30 arranged in symmetrical structures on both sides of the stator 26 as driving means for rotationally driving the impeller 43. A type BLDC motor 1 is adopted.

2 and 3, the coreless stator 26, for example, when forming the second housing 14 of the six coils (26b) wound on a square bobbin (26a) of a rhombic shape, respectively. It is embedded in the top plate 14a and integrated in the insert molding method.

In this case, the six coils 26b may be molded by a resin insulating material in a state in which the six coils 26b are connected to the auxiliary PCB so as to facilitate mutual connection between the coils.

The coil 26b of the stator 26 is, for example, three coils divided into six in the three-phase driving method is wound on the bobbin 26a and connected to the Y method in the auxiliary PCB, 2 in the two-phase driving method. Coils 26b are wound in eight and connected in series.

Since the coil 26b forms the stator 26 in a state where the exposed portion of the coil is sealed with a resin insulating material, reliable insulation is also achieved between the coils 26b wound on the bobbin 26a, and moistureproof, vibration absorbing, and corrosion resistance Is also excellent.

Since the through hole 14e through which the support shaft 27 passes is formed in the upper plate 14a of the second housing 14, and the support shaft 27 is integrally fixed to the second housing 14 by an insert molding method. The fluid can be blocked from leaking through the through hole 14e.

The

double rotors

20 and 30 are composed of a first rotor 20 and a second rotor 30 which are arranged with an air gap in a symmetrical structure on both sides of the stator 26. The first rotor 20 is located inside the second housing 14, and the second rotor 30 is located inside the first housing 15 and is rotatably supported by the support shaft 27, respectively.

The first sleeve bearing 34a is disposed between the first rotor 20 and the support shaft 27, and the second sleeve bearing 34b is disposed between the second rotor 30 and the support shaft 27.

The first sleeve bearing 34a and the second sleeve bearing 34b may preferably use an oilless bearing such as a carbon bearing or a plastic bearing in consideration of contact with the fluid.

The first rotor 20 includes a plurality of magnets 22 arranged in parallel with one side of the stator 26 at a predetermined distance, and an annular shape disposed on the rear surface of the magnets 22 to form a magnetic circuit. The back yoke 21 and the rotor support 23 are fixed to the magnet 22 and the back yoke 21 integrally, and are rotatably supported by the support shaft 27.

Here, the rotor support 23 integrally forms the magnet 22 and the back yoke 21 in an insert molding manner.

The second rotor 30 includes a plurality of magnets 32 arranged in parallel with the other side of the stator at a predetermined distance and an annular back yoke disposed on the rear surface of the magnets 32 to form a magnetic circuit. 31 and a rotor support 33 which integrally fixes the magnet 32 and the back yoke 31 and is rotatably supported by the support shaft 37.

Here, the rotor support 33 is formed integrally with the magnet 32, the back yoke 31 and the impeller 43 in an insert molding method.

The mutual arrangement relationship between the

magnets

22 and 32 and the coils 26b of the stator 26 is such that the disc-shaped

magnets

22 and 32 are bobbins 26a, that is, square bobbin coils 26b. A structure arranged opposite to

The stator 26 includes six coils 26b, and eight N-pole and S-

pole magnets

22 and 32 are alternately arranged in the first rotor 20 and the second rotor 30, respectively. .

In this case, the first rotor 20 and the second rotor 30 are composed of a plurality of N-pole and S-pole divided magnet pieces as shown in FIG. 4, or N-pole and S-pole are split magnetized in a ring-shaped magnet. It is also possible to use magnets.

The stator 26 embeds a plurality of coils 26b in the center of the upper plate 14a of the second housing 14 when insert molding the second housing 14 so as to be integral with the second housing 14. Is formed.

As described above, since the stator 26 is integrally formed inside the second housing 14 by insert molding, water may be blocked from flowing into the stator 26.

The stator 26 receives a driving signal for the stator coil 26b from the driver 36 embedded in the second housing 14.

Referring to the operation of the fluid pump of the present invention configured as described above are as follows.

When a driving current is applied from the driver 36 to the coil 26b of the motor 1 according to an embodiment of the present invention, a magnetic field is formed in a predetermined setting direction. Here, if the

magnets

22 and 32 of the first rotor 20 and the second rotor 30 are disposed with opposite polarities, the

magnets

22 and 32 of the first rotor 20 and the second rotor 30 may be disposed at opposite polarities. The same repulsive force or suction force is applied between 32 and coil 26b.

Accordingly, the repulsive force and the suction force between the

magnets

22 and 32 and the coil 26b act in opposite directions to cancel each other so that the axial vibration is kept to a minimum while the first rotor 20 and the second rotor 30 are kept. Rotate around the support shaft (27). Due to the rotation of the first rotor 20 and the second rotor 30, the impeller 43 integrally formed with the second rotor 30 also rotates, and as a result, the fluid introduced into the inlet 15a Pumped and discharged to the outlet (15b).

The fluid pump according to the embodiment of the present invention employs an axial type coreless BLDC motor as the motor 1 for driving the impeller 43, and thus the motor size is about 1/2 the weight of the conventional core type motor. It is possible to realize a slim structure with about 1/3 reduction.

In addition, the fluid pump according to an embodiment adopts the double rotor type in the axial type coreless BLDC motor and moves the coreless stator 26 and the support shaft 27 to the second housing of the pump housing 10. It can be integrally formed with 14) to realize complete waterproofing of the motor 1.

Moreover, the fluid pump according to one embodiment canned the conventional sealing cand cover by integrally forming the coreless stator 26 and the support shaft 27 in the second housing 14 of the pump housing 10. It is possible to omit a separate waterproofing process such as a cover), which causes the magnetic gap between the first rotor 20 and the second rotor 30 and the stator 26 of the motor 1 to be set to an optimal state. Efficiency can be improved and manufacturing cost can be reduced.

In addition, the fluid pump according to the embodiment can minimize the components required to drive and support the impeller 43, thereby reducing cost and improving durability.

In the above-described embodiment, the coreless stator is used in order to achieve a slim structure while adopting the axial type BLDC motor as the impeller driving motor 1, but it is also possible to use the core type stator. .

In the above-described embodiment, the coil 26b is wound around the bobbin 26a in the coreless stator, but a bobbinless type coil may be applied to further slim down the coreless stator.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and the general knowledge in the technical field to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications will be made by those who possess.

The fluid pump according to an embodiment of the present invention mechanically separates between the motor generating the rotational force and the impeller pumping the fluid, and uses the magnetic force to transmit the rotational force of the motor to the impeller so as to naturally waterproof the motor. It can be applied to a fluid pump requiring sealing of a motor such as a water pump or fuel pump.

Claims

A first housing and a second housing coupled to each other;

A support shaft fixed to the second housing;

An impeller accommodated in the first housing and pumping fluid;

A stator fixed to the second housing;

A first rotor disposed inside the second housing and rotatably supported by the support shaft and disposed to face one side of the stator; And

And a second rotor fixed to the impeller and rotatably supported on the support shaft and disposed to face the other side of the stator.
The method of claim 1,

The support shaft is integrally formed with an insert molding on the upper plate of the second housing, the upper side is located inside the first housing, the lower side is located within the second housing.
The method of claim 1,

And a driver for applying a driving signal to the stator in the second housing.
The method of claim 1,

The stator is a fluid pump, characterized in that the coreless type.
The method of claim 1,

The stator is a fluid pump, characterized in that integrally fixed to the upper plate of the second housing by insert molding.
The method of claim 1,

The first rotor and the second rotor is a fluid pump, characterized in that it comprises a plurality of magnets consisting of a split piece or a ring magnet in which the N and S poles are divided and magnetized.
The method of claim 1,

The first rotor and the second rotor is a fluid pump, characterized in that the surfaces facing each other are arranged with the opposite polarity.
The method of claim 1,

The first rotor includes a rotor support rotatably supported by a support shaft positioned inside the second housing, a plurality of magnets fixed to the rotor support, and a back yoke disposed on the back of the magnet.
The method of claim 1,

The second rotor may include a rotor support rotatably supported by a support shaft positioned inside the first housing and fixed to an impeller, a plurality of magnets fixed to the rotor support, and a back yoke disposed on a rear surface of the magnet. Including a fluid pump.
The method of claim 1,

And the first rotor and the second rotor are rotatably supported on the support shaft by a sleeve bearing.
An axial type motor having a stator and a first rotor and a second rotor disposed on both sides of the stator to generate rotational force;

A first housing formed with an inlet and outlet through which fluid flows in and with a second rotor accommodated therein;

A second housing accommodating the first rotor and having the stator integrally embedded in the upper plate;

A support shaft disposed through the upper plate of the second housing, the first rotor rotatably supported on the upper side, and the second rotor rotatably supported on the lower side; And

And an impeller housed in the first housing and integrally formed with the first rotor to pump the fluid.