JPH0988868A - Magnetic coupling pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability by suppressing the wear of a thrust bearing to support an impeller. SOLUTION: An impeller 5 is turnably arranged in a pump chamber 4 provided with a suction port 1a and a discharge port 1b. The impeller 5 is provided with blades 7 on one end face side of a disk-shaped body 6, and with a rotary shaft 8 and a magnet 9 on the other end face side of the body 6. A pump P1 rotates the impeller 5 to feed the cooling water L by the magnetic force which is applied from the other end face side of the impeller body 6 around the pump chamber 4 and attracts the magnet 9. The impeller 5 is supported by a thrust bearing 12 abutted on a tip surface 8a of the rotary shaft 8 and a supporting member to be arranged in the pump chamber 4 relative to the thrust along the axial direction of the rotary shaft 8 which is applied as the component of the magnetic force.

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 arranged in a cooling circuit of an automobile.

[0002]

2. Description of the Related Art Conventionally, a magnetic coupling pump of this type is known as shown in FIG. 4 (Japanese Patent Laid-Open No. 64-66).
490, Japanese Utility Model Publication No. 56-90496, Japanese Utility Model Publication No. 2-72653, etc.).

In this magnetic coupling pump P0, a partition wall 2 and a lid body 3 are disposed and fixed to a housing 1, a pump chamber 4 is formed on one side with the partition wall 2 in between, and a motor chamber 14 is formed on the other side. It was

A suction port 1a and a discharge port 1 are provided on the pump chamber 4 side.
b and the impeller 5 were provided. The impeller 5 includes a disc-shaped main body 6, a plurality of vane plates 7 arranged on one end face side of the main body 6, a rotary shaft 8 arranged at the center of the other end face side of the main body 6, and a main body. 6 has a ring-shaped magnet 9 arranged and fixed around the rotary shaft 8 on the other end surface side of 6. The annular magnet 9 had its NS pole magnetized in its circumferential direction.

The impeller 5 has a tip surface 8 of the rotary shaft 8.
a is supported by a pivot ball bearing 12 as a thrust bearing arranged at the bottom of the bearing recess 2a of the partition wall 2 and is rotatably supported in the pump chamber 4. In addition, 12a is a ball and 12b is a cup fitted in the bearing recess 2a. Reference numeral 13 is a bearing metal fitted in the bearing recess 2a and arranged on the peripheral surface 8b of the rotary shaft 8.

The motor chamber 14 includes a plurality of stator cores 15
The stator coil 16 is wound around each of the above. The motor configured in the motor chamber 14 is an axial air gap type brushless DC motor.

In the magnetic coupling pump P0, when the stator coils 16 are energized, the stator coils 16 are excited so as to generate a magnetic force that attracts the magnets 9, the impeller 5 rotates, and the fluid L flows. It was supposed to be sent.

[0008]

However, in this magnetic coupling pump P0, when the fluid L is fed, the magnet 9 fixed to the impeller 5 is attracted to the motor chamber 14 side by the magnetic force of the stator coil 16. Since the impeller 5 rotates while receiving the thrust along the axial direction of the rotating shaft 8 acting as a component of magnetic force, the pivot ball bearing 12 supporting the impeller 5 has the rotating shaft 8 Bearing 1 along the axial direction
Thrust load acts in the direction of the 2nd side.

Therefore, the tip surface 8a of the rotary shaft 8 and the bearing 1
The second ball 12a and the cup 12b were easily worn, and the durability of the magnetic coupling pump P0 was deteriorated.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a magnetic coupling pump capable of suppressing wear of a thrust bearing that supports an impeller and improving durability.

[0011]

A magnetic coupling pump according to the present invention has a vane plate on one end face side of a disk-shaped main body in a pump chamber having an intake port and a discharge port. An impeller having a rotary shaft and a magnet on the end face side is rotatably disposed with the tip end face of the rotary shaft supported by a thrust bearing, and the other end face side of the impeller body around the pump chamber. Is a magnetic coupling pump that rotates the impeller by a magnetic force that acts to attract the magnet to feed a fluid, wherein the impeller acts as a component of the magnetic force. With respect to the thrust along the direction, the thrust bearing, and a support member arranged in the pump chamber,
It is supported by.

The support member is a bearing metal arranged on the peripheral surface of the rotary shaft, and is in sliding contact with a portion of the bearing metal supported by the bearing metal, on the end face of the bearing metal on the side of the impeller body. The receiving plate and the compression elastic body which is interposed between the receiving plate and the impeller body and exerts a biasing force smaller than the thrust may be arranged.

[0013]

In the magnetic coupling pump according to the present invention, the impeller is provided with a thrust bearing for thrust in the axial direction of the rotating shaft that acts as a component of the magnetic force for rotating the impeller.
And a support member arranged in the pump chamber.

That is, at the time of rotation of the impeller, the rotating shaft rotates due to the magnetic force acting on the magnet in the thrust bearing side direction along the axial direction of the rotating shaft while the thrust acts. The vehicle is supported by the thrust bearing and the supporting member, and the thrust bearing is not the only conventional thrust bearing.

Therefore, in the magnetic coupling pump according to the present invention, the thrust acting on the rotation of the impeller is divided into two parts by the thrust bearing and the support member, so that the thrust load acting on the thrust bearing can be reduced and the impeller can be operated. It is possible to suppress wear of the thrust bearing that is supported and improve durability.

The supporting member is a bearing metal arranged on the peripheral surface of the rotating shaft, and a receiving plate is slidably contacted with an end surface of the bearing metal on the side of the impeller body at a portion supported by the bearing metal of the impeller. And a compression elastic body that is interposed between the receiving plate and the impeller body and exerts a biasing force smaller than the thrust, the following actions and effects should be obtained. You can

That is, at the time of rotation of the impeller, a compression elastic body for exerting a biasing force smaller than the thrust is interposed at a portion corresponding to the end surface of the bearing metal as a support member that opposes the thrust together with the thrust bearing, and the receiving plate is provided. Is provided, the compression elastic body is compressed, and the tip end surface of the rotary shaft is appropriately brought into contact with the thrust bearing.

Therefore, the tip end surface of the rotating shaft is slidably contacted with the thrust bearing, and the receiving plate is slidably contacted with the end surface of the bearing metal, so that the blade smoothly moves along the axial direction of the rotating shaft. The car will rotate.

The thrust bearing and the bearing metal end face are supported by the thrust bearing and the end face of the bearing metal with a substantially equal load with respect to the thrust acting as a component of the magnetic force, so that the wear of both parts is substantially equalized. The spring constant of the compression elastic body may be set so that the compression force (biasing force) of the compression elastic body when the tip end surface of the rotary shaft is brought into contact with is 1/2 of the thrust. Incidentally, the compression elastic body may be exemplified by a coil spring, a leaf spring, rubber or the like.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In addition, the same members as the conventional example,
The same reference numerals are attached.

The magnetic coupling pump P1 of the embodiment is a water pump provided in a cooling circuit of an automobile as shown in FIG. 1, and a partition wall 2 and a lid 3 are arranged in a housing 1 as in the conventional example. It is fixed, on one side with the partition wall 2 in between,
A pump chamber 4 is formed, and a motor chamber 14 is formed on the other side with the partition wall 2 in between.

On the pump chamber 4 side, a suction port 1a and a discharge port 1b formed in the casing 1 are arranged, and the pump chamber 4
The impeller 5 is arranged inside.

The impeller 5 comprises a disc-shaped main body 6 made of a non-magnetic material, a plurality of vane plates 7 arranged on one end surface side of the main body 6, and a central portion on the other end surface side of the main body 6. Rotating shaft 8
And a ring-shaped magnet 9 arranged and fixed around the rotary shaft 8 on the other end surface side of the main body 6.
The annular magnet 9 has an NS pole magnetized in its circumferential direction.

The impeller 5 has a tip surface 8 of the rotary shaft 8.
a is supported by a pivot ball bearing 12 as a thrust bearing arranged at the bottom of the bearing recess 2 a of the partition wall 2 and is rotatably supported in the pump chamber 4. Reference numeral 12a is a stainless steel ball, and 12b is a stainless steel cup fitted in the bearing recess 2a. Further, 13 is a bearing recess 2a
It is a bearing metal that is fitted inside and is in sliding contact with the peripheral surface 8b of the rotary shaft 8.

Further, the motor chamber 14 is formed by winding a stator coil 16 around each of a plurality of stator cores 15.

In the magnetic coupling pump P1 of the embodiment, a circle slidably contacting the end face 13a of the bearing metal 13 on the impeller body 6 side so that the bearing metal 13 serves as a support member for the thrust when the impeller 5 rotates. Annular support plate 10
And a compression coil spring 11 as a compression elastic body interposed between the receiving plate 10 and the impeller body 6. The spring constant of the coil spring 11 is set so that the biasing force of 1/2 of the thrust acts on the ball 12a of the pivot ball bearing 12 at the position where the tip surface 8a of the rotating shaft abuts.

In the magnetic coupling pump P1 of the embodiment, by energizing each stator coil 16, the stator coil 16 is excited so as to generate a magnetic force that attracts the magnet 9, and the impeller 5 rotates to cool the cooling water. L will be sent.

At this time, the rotating shaft 8 is rotated by the magnetic force acting on the magnet 9 while the thrust acts in the direction toward the bearing 12 along the axial direction of the rotating shaft 8, but the impeller 5 moves. Since the bearing 12 and the end surface 13a of the bearing metal 13 do not counter the thrust by the bearing 12 as in the conventional case, the bearing 12 supporting the impeller 5 and the rotating shaft 8 do not. Wear can be suppressed and the durability of the pump P1 can be improved.

Further, a compression coil spring 11 for exerting a biasing force smaller than that of the thrust is arranged on the end surface 13a side of the bearing metal 13 as a support member which opposes the thrust together with the bearing 12, and by the compression of the spring 11. ,
Since the tip end surface 8a of the rotary shaft can be appropriately brought into contact with the bearing 12, the tip end surface 8a of the rotary shaft is brought into proper sliding contact with the bearing 12, and the receiving plate 10 is brought into sliding contact with the end surface 13a of the bearing metal 13. The impeller 5 smoothly rotates without shaking along the axial direction of the rotary shaft 8.

In particular, in the magnetic coupling pump P1 of the embodiment, the spring 1 when the tip end surface 8a of the rotating shaft contacts the bearing 12
Since the spring constant of the spring 11 is set so that the compressive force (biasing force) of 1 is 1/2 of the thrust, the bearing 12 and the bearing metal 13 are applied to the thrust acting as a component of the magnetic force. The end surface 13a of the bearing can be supported by a substantially equal load, and the bearing metal 13 and the bearing 1 can be well balanced.
2. Furthermore, it is possible to prevent wear of the rotary shaft 8 and the receiving plate 10 in the vicinity thereof.

When the compression elastic body such as the spring 11 is not used, for example, like the magnetic coupling pump P2 shown in FIG. 3, the rotary shaft 8 is provided with a flange 18 that abuts against the end surface 13a of the bearing metal 13. Providing thrust against the bearing 1
2 and the end surface 13a of the bearing metal 13 may be configured to face each other.

In the pumps P1 and P2, the case where an axial air gap type brushless DC motor is used as a drive device for rotating the impeller 5 is shown, but other than the impeller body 6 around the pump chamber 4. If the configuration is such that the impeller 5 can be rotated by the magnetic force that acts from the end face side to attract the magnet 9, then it is actually opened.
As described in Japanese Patent Publication No. 89, the present invention can also be applied to a pump that separately uses a prime mover that rotates a magnet as a drive device.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view showing a main part of the same embodiment.

FIG. 3 is a cross-sectional view showing another embodiment.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 1a ... intake port, 1b ... discharge port, 4 ... pump chamber, 5 ... impeller, 6 ... main body, 7 ... blade plate, 8 ... rotating shaft, 8a ... tip surface, 8b ... peripheral surface, 9 ... magnet, 10 ... Support plate, 11 ... (compression elastic body) compression coil spring, 12 ... (thrust bearing) pivot ball bearing, 13 ... Bearing metal, 13a ... End surface, P0 / P1 / P2 ... Magnetic coupling pump, L ... (fluid) cooling water .

Claims (2)

[Claims] 1. An impeller having a vane plate on one end face side of a disc-shaped main body and a rotary shaft and a magnet on the other end face side of the main body in a pump chamber having an intake port and a discharge port. Is rotatably supported by supporting the tip end surface of the rotary shaft by a thrust bearing, and acts by the magnetic force to attract the magnet by acting from the other end surface side of the impeller body around the pump chamber. A magnetically coupled pump that rotates an impeller to feed a fluid, wherein the impeller is provided with respect to the thrust bearing along the axial direction of the rotating shaft that acts as a component of the magnetic force, and the thrust bearing, A magnetic coupling pump, which is supported by a support member disposed in the pump chamber. 2. The supporting member is a bearing metal arranged on the peripheral surface of the rotating shaft, and the impeller is provided at a portion supported by the bearing metal, on the impeller main body side of the bearing metal. And a compression elastic body that is interposed between the reception plate and the impeller body and exerts a biasing force smaller than that of the thrust. The magnetic coupling pump according to claim 1.