JPH07189977A - Centrifugal pump - Google Patents

Abstract

PURPOSE:To perform positioning correctly and with efficiency by fixing a driving magnet to a yoke plate fixed to a bush formed of nonmagnetic material and fitted to a driving output shaft in a centrifugal pump put in pumping action by rotating an impeller by magnetic coupling. CONSTITUTION:A main part is formed of a driving part 1 and a pump chamber 10 airtightly partitioned by a partition plate 11. A driving magnet 5 rotated by a motor 2 is disposed at the driving part 1. A driven magnet 13 opposed to the driving magnet 5 through the partition plate 11, and an impeller 14 are disposed in the integrally rotatable state in the pump chamber 10. Pumping action is attained by the rotation of the driven magnet 13 and impeller 14 generated in association with the rotation of the driving magnet 5. In this case, a bush 8 formed of nonmagnetic material is fitted to the rotary shaft 2a of the motor 2, and a yoke plate 4 is fixed to the bush 8. The driving magnet 5 is fixed to the yoke plate 4 by bonding or the like.

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 which rotates an impeller by magnetic coupling to perform a pumping action.

[0002]

2. Description of the Related Art A centrifugal pump that rotates an impeller by magnetic coupling has a structure as shown in FIG. In FIG. 2, reference numeral 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, and 5 is means for adhering to the yoke plate 4, etc. The drive-side magnet fixed by means of the above constitutes the drive unit 1. A pump chamber 10 is airtightly partitioned from the drive unit 1 by a partition plate 11. In the pump chamber 10, a holding plate 12 and a driven magnet 1 are provided.
3, the magnet 13, and the impeller 14 are housed so that they can rotate integrally. Reference numeral 15 is a suction port, and 16 is a discharge port.

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

[0004]

In the centrifugal pump as described above, when the drive-side magnet 5 is attached to the yoke plate 4, it is necessary to properly position the magnet. Therefore, conventionally, as shown in FIG. 3, the magnet 5 is correctly positioned on the yoke plate 4 using the jig 20 and then bonded by the adhesive. As described above, the conventional method requires a jig and has a drawback that workability is poor.

In order to solve this drawback, it is conceivable to bond the magnet 5 with the outer peripheral portion 6a of the yoke plate 6 narrowed and the inner diameter 6b used 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 magnet performance deteriorates.

It is an object of the present invention to provide a pump for rotating the impeller by transmitting the rotation of the drive-side magnet to the driven magnet by magnetic coupling to perform a pumping action, and the drive-side magnet mounting structure is accurate and has good workability. It is to provide a centrifugal pump configured.

[0008]

The centrifugal pump of the present invention comprises:
It consists of a drive unit and a pump chamber that are airtightly divided by a partition plate, and the drive unit has a drive-side magnet that is rotated by a drive source such as a motor. The driven magnet and the impeller, which are arranged with the partition plate sandwiched with respect to the magnet, are provided so that they can rotate integrally.The non-fixed output shaft of the drive source of the drive magnet is fixed to the output shaft. Attach a yoke plate to a bush made of magnetic material so that the inner diameter of the ring-shaped magnet is in contact with 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. Thus, it is fixed by a fixing means such as adhesion.

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 the bush made of a non-magnetic material and adhering and fixing it to the bush. Accurate positioning can be performed without using a jig due to the inner peripheral surface of the ring-shaped magnet, and leakage of magnetic flux does not occur by forming the bush with a non-magnetic material.

[0010]

EXAMPLE An example of the centrifugal pump of the present invention will be described below. FIG. 1 is a view showing an embodiment of the present invention, in which 1 is a drive unit, 2 is a motor, 5 is a magnet on the drive side, 10 is a pump chamber, and 11 is a pump chamber.
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 central hole has a narrowed shape, and the bush 8 is press-fitted into the central hole. The outer diameter of the bush 8 and the inner diameter of the magnet 5 are matched with each other to form a ring-shaped magnet 5 as illustrated.
The inner wall surface and the outer wall surface of the bush 8 are combined and bonded so as to be in contact with each other. As a result, the driving-side magnet can be fixed to the yoke plate without using a jig and without being restricted in the outer circumference of the yoke plate in a correctly positioned state.

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

[0013]

According to the centrifugal pump of the present invention, since the drive side magnet is mounted through the bush made of the non-magnetic material mounted on the output shaft as described above, accurate positioning is performed with good workability. In addition, the magnetic leakage is extremely small.

[Brief description of 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 for attaching the driving-side magnet to the yoke plate.

[Explanation of symbols]

 1 Drive Unit 2 Motor 2a Output Shaft 5 Drive Side Magnet 7 Yoke Plate 8 Bushing 10 Pump Chamber 11 Partition Plate 13 Driven Magnet 14 Impeller

Claims (3)

[Claims] 1. A drive unit and a pump chamber which are airtightly partitioned by a partition plate, a drive-side magnet rotated by a drive source is disposed in the drive unit, and the drive chamber has a drive-side magnet. A driven magnet and an impeller, which are arranged with a magnet and a partition plate sandwiched therebetween, are rotatably arranged integrally, and a pump action is generated by rotation of the impeller accompanying rotation of the driven magnet due to rotation of the drive-side magnet. In the pump for carrying out the above, the magnet on the drive side is bonded to the yoke plate fixed to the bush made of a non-magnetic material attached to the output shaft of the drive source so that the inner diameter of the magnet is in contact with the outer diameter of the bush. A centrifugal pump characterized in that it is fixed by the fixing means. 2. The centrifugal pump according to claim 1, wherein the bush is made of a sintered copper alloy. 3. The centrifugal pump according to claim 1, wherein the bush is made of synthetic resin.