JP3200697B2 - Centrifugal 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 centrifugal pump, and more particularly, to a centrifugal pump that performs a pumping operation by rotating an impeller by magnetic coupling.

[0002]

2. Description of the Related Art A centrifugal pump for rotating an impeller by magnetic coupling has a structure as shown in FIG. In FIG. 2, 2 is a motor, 3 is a bush fixed to the output shaft 2a of the motor 2 by caulking, 4 is a yoke plate fixed to the motor shaft 2 via the bush 3, 5 is a means such as bonding to the yoke plate 4. The drive unit 1 is constituted by the drive-side magnet fixed by the above. Reference numeral 10 denotes a pump chamber which is air-tightly partitioned from the drive unit 1 by using a partition plate 11. The pump chamber 10 has a holding plate 12 and a driven magnet 1.
3, the magnet 13, and the impeller 14 are housed so as to be able to rotate integrally. Reference numeral 15 denotes a suction port, and 16 denotes a discharge port.

In such a pump, when the motor 1 rotates the driving magnet 5, the driven magnet 13 is rotated.
Rotates, and the impeller 14 also rotates to perform a pump action.

[0004]

In the above-described centrifugal pump, when the drive-side magnet 5 is mounted on the yoke plate 4, it must be positioned correctly. Therefore, conventionally, as shown in FIG. 3, the magnet 5 is properly positioned on the yoke plate 4 using the jig 20 and then bonded with an adhesive. As described above, the conventional method requires a jig and has disadvantages such as poor workability.

In order to solve this drawback, it is conceivable to squeeze the outer peripheral portion 6a of the yoke plate 6 and bond the magnet 5 with the inner diameter 6b as a guide as shown in FIG.

If the magnet 5 is fixed to the yoke plate by this method, the positioning can be performed without using a jig. However, when the pump is downsized, magnetic leakage occurs at the throttle portion and the ability of the magnet is reduced.

An object of the present invention is to provide a pump in which rotation of a driving magnet is transmitted to a driven magnet by magnetic coupling to rotate an impeller to perform a pumping operation. An object of the present invention is to provide a centrifugal pump having a good configuration.

[0008]

According to the present invention, there is provided a centrifugal pump comprising:
A drive section and a pump chamber are hermetically partitioned by a partition plate, and a drive-side magnet rotated by a drive source such as a motor is disposed in the drive section, while a drive-side magnet is provided in the pump chamber. The driven magnet and the impeller, which are arranged with the partition plate interposed between the magnet and the impeller, are provided so as to be able to rotate integrally.The output shaft of the drive source of the driving magnet is fixed to the output shaft. A yoke plate is attached to a bush made of a magnetic material, so that the inner diameter of the ring-shaped magnet contacts the outer diameter of the bush, that is, the inner surface of the center hole of the ring-shaped magnet is joined to the outer surface of the disk-shaped bush. In this way, it is fixed by fixing means such as bonding.

As described above, in the centrifugal pump of the present invention, the magnet is attached to the output shaft of the drive source by attaching the yoke plate to a bush made of a non-magnetic material and bonding it to the yoke plate. Accurate positioning can be performed by using the inner peripheral surface of the ring-shaped magnet without using a jig, and leakage of magnetic flux does not occur by forming the bush with a non-magnetic material.

[0010]

Next, an embodiment of the centrifugal pump of the present invention will be described. FIG. 1 is a view showing an embodiment of the present invention, wherein 1 is a drive unit, 2 is a motor, 5 is a magnet on the drive side, 10 is a pump room, 11
Is a partition plate, 12 is a holding plate, 13 is a driven magnet, 14
Is an impeller, 15 is a suction port, and 16 is a discharge port, which have substantially the same configuration as the conventional centrifugal pump shown in FIG.

In the embodiment shown in FIG. 1, the yoke plate 7 is
The center hole is narrowed, and the bush 8 is press-fitted into the center hole. The outer diameter of the bush 8 and the inner diameter of the magnet 5 are matched to form a ring-shaped magnet 5 as shown in the figure.
And the outer wall surface of the bush 8 is bonded so as to be in contact with each other. As a result, the drive-side magnet can be fixed to the yoke plate in a state where it is accurately positioned without using a jig and without narrowing the outer periphery of the yoke plate.

The bush 8 used in the present invention is made of a non-magnetic material, and examples thereof include a copper alloy such as brass, aluminum, a copper-based sintered alloy, and a synthetic resin material.

[0013]

According to the centrifugal pump of the present invention, since the mounting structure of the magnet on the driving side is performed through the bush made of non-magnetic material mounted on the output shaft as described above, accurate positioning can be performed with good workability. In addition to this, the configuration is such that magnetic leakage is extremely small.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional centrifugal pump.

FIG. 3 is a diagram showing a method of attaching a drive-side magnet to a yoke plate in the conventional example.

FIG. 4 is a diagram showing another method of attaching the drive side magnet to the yoke plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive part 2 Motor 2a Output shaft 5 Drive side magnet 7 Yoke plate 8 Bush 10 Pump room 11 Partition plate 13 Follower magnet 14 Impeller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-103988 (JP, A) JP-A-63-314394 (JP, A) JP-A-47-8336 (JP, A) JP-A-63-1988 314395 (JP, A) Japanese Utility Model Showa 49-29503 (JP, U) Japanese Utility Model Showa 53-77403 (JP, U) Japanese Utility Model Showa 45-27479 (JP, Y1) (58) Field surveyed (Int. ⁷ , DB name) F04D 13/02

Claims (3)

(57) [Claims] 1. A drive unit, which is hermetically partitioned by a partition plate, and a pump chamber, a drive-side magnet rotated by a drive source is disposed in the drive unit, and the drive-side magnet is disposed in the pump chamber. A driven magnet and an impeller are disposed so as to be integrally rotatable with a magnet and a partition plate interposed therebetween, and a pump action is performed by rotation of the impeller accompanying rotation of the driven magnet due to rotation of the drive-side magnet. In the pump, the magnet on the drive side is bonded to a yoke plate fixed to a bush made of a non-magnetic material attached to an output shaft of a drive source such that the inner diameter of the magnet contacts the outer diameter of the bush. A centrifugal pump fixed by the fixing means. 2. The centrifugal pump according to claim 1, wherein said bush is made of a copper-based sintered alloy. 3. The centrifugal pump according to claim 1, wherein said bush is made of synthetic resin.