JP3203543B2 - Magnetic coupling pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic coupling pump used for a water pump or the like provided in a cooling system of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, as this type of magnetic coupling pump, for example, those shown in FIGS.

In this magnetic coupling pump, a partition 51 is provided in a casing 51 so that a motor chamber 52 and a pump chamber 53 are provided.
A bearing 60 having one end 60 a protruding into the pump chamber 53 and a bearing 61 on the far bottom are disposed in the bearing accommodating portion 55 of the partition wall 54. Further, a plurality of stator cores 58 around which a stator coil 57 is wound, and a motor control board 59 are disposed in the motor chamber 52, and an impeller 62 is rotatably provided in the pump chamber 53.
The impeller 62 has a rotor magnet 63 and a rotating shaft 64 facing the stator core 58. The rotating shaft 64 is supported by bearings 60 and 61, and also faces one end 60 a of the bearing 60 via a washer 65. And it is formed so as to be positioned in the axial direction.

Then, the inside of the bearing housing 55 and the pump chamber 53
Are communicated with each other by a passage 56 provided outside the bearing 60, and the fluid and the abrasion powder of the bearings 60 and 61, which have entered the bearing housing 55 through the passage 56, are discharged to prevent stagnation of the fluid. Was configured to. In addition, as a technique for discharging the fluid from such a blind lane-like portion, Japanese Unexamined Patent Publication No. Hei.
There is one proposed in Japanese Patent No. 43654.

[0005]

However, in such a conventional magnetic coupling pump, the passage 56 extends almost linearly from inside the bearing accommodating portion 55 and opens to the pump chamber 53. There is a problem that minute foreign matter mixed in the fluid 53 easily enters the bearing housing portion 55.

Further, in the bearing housing portion 55, a portion where the passage 56 is formed is partially thinned (see FIGS. 5 and 6), so that there is a problem that the strength of the press-fit portion of the bearing 60 is insufficient. This insufficient strength is reinforced by forming a raised portion 55a outside the passage 56, as shown in FIGS. 7 and 8, but as a result, the motor chamber 52 space for accommodating the control board 59 and the like. There was a problem of narrowing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to prevent the intrusion of foreign matter into a bearing accommodating portion and maintain the strength of a bearing press-fit portion to discharge fluid from the bearing accommodating portion. It is an object of the present invention to provide a magnetic coupling pump which can be used.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and a magnetic coupling pump according to the present invention is provided with a casing, a motor chamber and a pump provided in the casing. A partition that forms a chamber, a plurality of stator cores provided in the motor chamber, each having a stator coil wound thereon, a rotor magnet and a rotating shaft disposed to face the vane plate and the plurality of stator cores. Impeller rotatably provided in the pump chamber, wherein the partition has a bearing accommodating portion provided with a bearing for supporting the rotating shaft, and the impeller is provided with a bearing for the bearing. A magnetic coupling pump that is positioned in the axial direction so as to face one end, and in which the inside of the bearing accommodating portion and the pump chamber communicate with each other via a passage, wherein the impeller includes the bearing A communication groove extending in a centrifugal direction from a fitting portion of the rotating shaft to the opposite surface of the rotating shaft and opening to the pump chamber. A magnetic coupling pump, which is connected to the pump chamber.

A flat washer may be loosely fitted and interposed between the one end of the bearing and the opposing surface of the impeller.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

The magnetic coupling pump of this embodiment is shown in FIGS.
, The casing 1, the motor chamber 8, and the pump chamber 9
, A plurality of stator cores 10 provided in the motor chamber 8 and wound with the stator coil 13, a blade plate 22, a rotor magnet 25, and a rotating shaft 27, which are rotatable in the pump chamber 9. The partition 5 has a bearing accommodating portion 6 provided with a bearing 17 that supports the rotating shaft 27. The impeller 20 is provided with a communication groove 24 in a surface 23 a facing the bearing 17. The flat washer 30 is loosely fitted between the bearing 17 and the facing surface 23a.
The inside is communicated with the pump chamber 9 through a communication groove 24 and a fitting gap B between the rotating shaft 27 and the bearing 17 (see FIG. 2).

The casing 1 has a suction port 2a and a discharge port 2b.
A casing main body 2 having a
And a motor chamber 8 is formed on one side, and a pump chamber 9 is formed on the other side.

The partition wall 5 is made of, for example, a PPS resin (polyphenylene sulfide resin), has a bearing housing 6 having a bottomed hole projecting toward the motor chamber 8 in the center, and an O-ring 7 on the casing body 2. It is fixed in a water-tight manner through the intermediary. A bearing 17 provided on the opening side and a bearing 18 provided on the inner bottom side are press-fitted and fixed to the bearing accommodating portion 6, and one end 17 a of the bearing 17 is disposed so as to slightly protrude into the pump chamber 9. Has been established.

The motor chamber 8 is provided with a plurality of stator cores 10 around which a stator coil 13 is wound and an annular magnetic plate 11. The bobbin 14 of the stator coil 13 has a bearing housing 6 at a protruding portion thereof. A control board 15 of the motor unit is attached so as to surround the motor board.

The impeller 20 includes a disk-shaped main body 21 made of a non-magnetic material, a plurality of impellers 22 protruding from one side of the main body 21, and a circle disposed on the other side of the main body 21. It comprises an annular rotor magnet 25 and a rotating shaft 27 fixed to the boss 23 at the center of the main body 21.

The rotor magnet 25 is located in the circumferential direction NS.
The poles are magnetized, and are arranged facing the plurality of stator cores 10 at a predetermined distance. Note that reference numeral 2
Reference numeral 6 denotes a magnetic plate for enhancing magnetic force. The rotating shaft 27 is
One end has a small diameter portion 27a, and the boss 23
, And the small-diameter portion 27 a is supported by the bearing 18.

The boss portion 23 is formed so as to protrude from the main body 21 in the direction of the bearing 17, and a communication groove 24 extending in the centrifugal direction is formed in an opposing surface 23 a opposing the one end portion 17 a of the bearing 17. The communication groove 24 has an outer end 24 a opened outward from the outer diameter of the flat washer 30, and an inner end 24 b formed on the rotating shaft 2.
7 is formed.

The flat washer 30 has an inner diameter larger than the diameter of the rotary shaft 27 and an outer diameter inside the outer end 24a, and extends between the flat shaft 30 and the rotary shaft 27 while being loosely fitted to the rotary shaft 27. A loose fitting gap A is formed, and the outer end 2 is formed outside the flat washer 30.
4a is formed to open.

The magnetic coupling pump configured as above is
By generating a rotating magnetic field in the plurality of stator cores 10 and exerting a magnetic attraction force on the rotor magnet 25 from the stator cores 10, the impeller 20 is rotated to suck the fluid L from the suction port 2a and discharge it from the discharge port 2b. .

At this time, the impeller 20 generates a thrust in the direction of the bearing 17 along the axial direction of the rotating shaft 27 by the magnetic force acting on the rotor magnet 25, so that the opposing surface 23a
Contacts one surface of the flat washer 30, and the other surface of the flat washer 30 rotates while being in contact with one end 17 a of the bearing 17. The flat washer 30 rotates along with the impeller 20 to form a loose fitting gap A between the flat washer 30 and the rotating shaft 27, and one surface of the flat washer 30 covers most of the communication groove 24, and the outer end 24a is a pump. The state is opened to the chamber 9.

Further, between the bearing 17 and the rotating shaft 27,
There is a fitting gap B up to the fit, and the bearing housing 6
The inside is communicated with the pump chamber 9 through a labyrinth-like passage composed of the fitting gap B, the loose fitting gap A, and the communication groove 24.

When the impeller 20 rotates, a pressure difference is generated between the bearing housing 6 and the pump chamber 9. The fluid L that has entered the bearing housing 6 from the fitting gap B between the bearing 17 and the rotary shaft 27 is sucked out by the pressure difference, and is discharged from the discharge port 2b together with the fluid L flowing through the pump chamber 9. At this time, the wear powder of the bearings 17 and 18 is also discharged, and the fluid L in the bearing housing 6 and the wear powder are prevented from staying, and the inside of the bearing housing 6 is kept clean.

A passage extending from the inside of the bearing accommodating portion 6 through the communication groove 24 is formed in a labyrinth shape, and the outer end 24a, which is the entrance of the passage, rotates, so that it is mixed in the fluid L. This makes it difficult for foreign substances to enter the passage.
Further, the bearing accommodating portion 6 does not require the above-described processing for forming the passage, and can maintain the strength of the press-fit portion of the bearing 17 and sufficiently secure a space for the control board 15.

The above-described flat washer 30 may be omitted, and the opposing surface 23a of the boss 23 may be directly opposed to one end 17a of the bearing 17. At this time, the communication groove 24
Is formed so as to be located outside the outer diameter of the bearing 17. Further, a plurality of communication grooves 24 may be provided.

[0025]

As described above, according to the magnetic coupling pump of the present invention, a labyrinth-like passage for communicating the inside of the bearing housing with the pump chamber is provided by the communication groove provided on the impeller side. In addition, the fluid in the bearing accommodating portion and the wear powder of the bearing are discharged to the outside to keep the inside of the bearing accommodating portion clean, and it is possible to prevent foreign substances mixed in the fluid in the pump chamber from entering.

Further, since the passage is formed, the strength of the bearing press-fitting portion can be sufficiently secured without special processing of the bearing accommodating portion as in the conventional example, and the space for the control board and the like is reduced. This has the effect of preventing the formation of the film.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a magnetic coupling pump according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a communication groove portion according to the embodiment.

FIG. 3 is an enlarged view of the communication groove portion as viewed in the axial direction.

FIG. 4 is a sectional view of a conventional magnetic coupling pump.

FIG. 5 is an enlarged sectional view showing a passage portion of FIG. 4;

FIG. 6 is an axial sectional view of a passage portion of FIG. 5;

FIG. 7 is an enlarged sectional view showing a passage portion of another conventional example.

8 is a sectional view of the passage portion of FIG. 7 as viewed in the axial direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 5 Partition wall 6 Bearing accommodating part 8 Motor room 9 Pump room 10 Stator core 17 Bearing 17a One end 20 Impeller 23a Opposing surface 24 Communication groove 24a Outer end 25 Rotor magnet 27 Rotary shaft 30 Flat washer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-21197 (JP, A) JP-A-59-591 (JP, A) JP-A-51-52502 (JP, A) JP-A 48-197 9401 (JP, A) JP-A-61-212696 (JP, A) JP-A-4-109494 (JP, A) JP-A-59-586 (JP, U) JP-A-1-103790 (JP, U) JP-B-46-7856 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 13/02 F04D 13/06

Claims (2)

(57) [Claims] 1. A casing, a partition provided in the casing and forming a motor chamber and a pump chamber in the casing, a plurality of stator cores provided in the motor chamber and wound with respective stator coils, and a blade plate. A rotor magnet and a rotating shaft arranged face-to-face with the plurality of stator cores, and an impeller rotatably provided in the pump chamber, wherein the partition wall includes the rotating shaft. A bearing accommodating portion provided with a bearing that supports the shaft, the impeller is positioned in the axial direction so as to face one end of the bearing, and the inside of the bearing accommodating portion and the pump chamber are interposed via a passage. A magnetic coupling pump communicated with the impeller, wherein the impeller has a communication groove extending in a centrifugal direction from a fitting portion of the rotating shaft in a surface facing the bearing and opening to the pump chamber; Magnetic coupling pump bearing receptacle is in communication with the pump chamber through the fitting clearance between the communicating groove and the rotary shaft and the bearing, characterized in that. 2. The magnetic coupling pump according to claim 1, wherein a flat washer is loosely fitted and interposed between the one end of the bearing and an opposing surface of the impeller. A magnetic coupling pump characterized by the above-mentioned.