JPS6014224B2 - Magnetic coupling rotation transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetically coupled rotation transmission device, and is intended to eliminate the load in the ball direction due to attraction of a magnet.

Generally, a magnetically coupled rotation transmission device has a pair of flat magnets facing each other, and by rotating one, the other is driven to follow, but since a magnetic attraction force acts between both magnets, the rotation of the magnet on the driven side A large load is applied to the shaft in the direction of the ball. As a result, large amounts of wear occur at the bearing portion of the rotating shaft. The present invention solves these problems, and an example in which the present invention is applied to an eccentric rotary pump will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a pump case made of a synthetic resin material, which has, for example, a cavity 2 for housing a pump part and a cavity 3 at the other end for housing a magnet for rotation transmission.

These empty rooms 2 and 3 are located on the same axis, and the center portion thereof is open. Two communication ports 4 and 5 for suction and discharge of fluid are provided in the side wall of the chamber 2 for housing the pump unit so as to be suitable for fluid intake and discharge. A driven magnet 6 is provided within the empty chamber 3.

The driven magnet 6 is formed into a disk shape by molding a magnet 7 and a yoke plate 8 with synthetic resin, and has a rattan coupling hole 9 in the center. Further, an end face bearing 10 having a rounded top is provided at the center of the outer end face. The outer diameter of the driven magnet 6 is slightly smaller than the inner diameter of the cavity 3, and therefore it is rotatable within the cavity 3. A seal plate 11 made of a non-magnetic material is attached to the entrance of the empty chamber 3 with screws. The top of the end bearing 10 of the driven magnet 6 is in contact with the seal plate 11. In this case, in the sealed cavity 3, the driven magnet 6 has a space A on the coupling side with a driving magnet, which will be described later, larger than a gap B on the non-coupling side. The seal plate 11
A drive magnet 12 is arranged on the outer side of the drive magnet 12 .

This drive magnet 12 is connected to the shaft 1 of a motor (not shown).
3 and corresponds to the above-described driven magnet 6, so that the driving magnet 12 and the driven magnet 6 are magnetically coupled. A pump section is provided in the other cavity 2 of the pump case 1.

This pump section includes a rotor 14, an eccentric ring 15 surrounding the rotor 14, a pump chamber side plate member 16 positioned at both ends of the rotor 14 and forming a pump chamber with the eccentric D ring 15, and the driven magnet. 6 and the shaft 17 of the rotor 14 coupled to the pump chamber side slope member 16.
It is composed of a bearing 18 that holds the. The rotor 1
4 is a disc-shaped rotating body 19 with a required wall thickness, and a blade 20.
It consists of two side plates 21 and a shaft 17. This rotating body 19 has a plurality of grooves 22 extending from the inside toward the outer circumferential edge and opening at the outer circumferential traverse. A blade 20 is inserted into the foundation 22 in a reciprocating manner, and the blade 20 is inserted into the groove 2.
2 is biased in the projecting direction by a spring 23 provided on the inner bottom. The eccentric ring 16 is formed into a cylindrical shape with an outer diameter that matches the cavity 2 of the pump case 1, and a circular hole forming the inner circumference is eccentric with respect to the outer circumference.

This eccentric ring 15 has cutout portions 24 and 25 for fluid inflow and outflow. This eccentric ring 15 is fitted into the cavity 2 of the pump case 1 and surrounds the rotating body 19 of the rotor 14. Pump chamber side plate member 1
Reference numeral 6 is formed into a dish shape having an outer shape that fits the cavity 2 of the pump case 1, and has a recessed portion on the inner side into which the side plate 21 of the rotor 14 fits. Furthermore, there is a cylindrical bearing 18 in the center.
is firmly attached. This bearing 18 holds the track 17 of the rotor 14, and its end on the rotor side protrudes slightly higher than the inner bottom surface of the recess. This pump chamber side slope member 16 is fitted and fixed in the cavity 2 of the pump case 1, and is arranged so as to correspond to both side surfaces of the rotor 14, and forms a pump chamber with the biased D ring 15. The entrance of the empty chamber 2 in which the rotor 14, pump chamber side plate member 16, etc. of the pump case 1 are housed is closed with a lid 26. Note that a portion of the fluid is configured to flow into the cavity 2 that accommodates the driven magnet 6 described above. The eccentric rotary pump of the present invention is constructed as described above, and when the motor shaft 13 is rotated, the drive magnet 12 rotates, and the rotation is transmitted to the driven magnet 6 which is magnetically coupled to the outside of the rotary torque.

When the driven magnet 6 rotates, the rotor 14 coupled thereto rotates. The tips of the blades 20 of the rotor 14 are brought into contact with the inner wall of the eccentric ring 15 due to the biasing force of the spring 23 in the groove 22 of the rotor 19, and as the rotor 14 rotates, the eccentric ring 15 and the rotor 1 are brought into contact with each other.
The volume of the space defined by the blades 9 and the blades 20 is continuously changed, and this volume change performs a pumping action in which fluid is sucked in from one of the two cut sections 24 and 25 and discharged from the other. The present invention is a rotation transmission system using magnets, in which the driven magnet 6 is free in the rutting direction and is pulled by the disturbance magnet 12, but maintains a constant position because the end face bearing 10 contacts the seal plate 11. The relationship is as follows: inside the bonding side void, A>inside the non-bonding side void 8.

In addition, the empty chamber 3 that houses the driven magnet 6 is an open space, and there is fluid inflow from the top pump section initially, but once it is filled with fluid, there is no subsequent fluid inflow, and energy exchange with the outside occurs. is kept almost non-existent. When the driven magnet 6 rotates now, a relative velocity is generated between it and the fluids in the gaps A and B.

Considering the non-coupled side gap B, since the inside is set small, the fluid in the gap B swirls due to the rotation of the driven magnet 6, but the fluid frictional resistance of the wall A has a large effect of decelerating the fluid. That is, if the inside of the gap B is small, the fluid frictional resistance of the wall A will affect the vicinity of the driven magnet 6, and as a result, the swirling of the fluid will be suppressed. When the rotation of the fluid in the gap B becomes slow, the relative speed with respect to the fluid increases if the rotation of the driven magnet 6 is constant. Then, when looking at the fluid in gap B from the driven magnet 6, this fluid is moving at a high speed, and according to Bernoulli's theorem, the static pressure of a fast-moving fluid decreases, so it is easier to drive than in a stationary fluid. The static pressure near the surface of the magnet 6 decreases. The degree of decrease is proportional to the magnitude of the relative velocity. On the other hand, in the gap A, the seal plate 11
Since the distance between the wall opening and the driven magnet 6 is large compared to the gap B, the influence of the fluid foundation resistance on the fluid at the wall opening does not extend to the driven magnet 6, and the fluid in the gap A does not reach the driven magnet 6. 6, it is fully rotated. As a result, when looking at the fluid from the driven magnet 6, the fluid velocity is slow, which corresponds to a small relative velocity, and for the same reason as the gap B, the static pressure near the surface of the driven magnet 6 is higher than that on the gap B side. do. As a result, the static pressure in the coupling side gap A becomes higher than the static pressure in the non-coupling side gap B, and this static pressure difference acts as a force on the driven magnet 6.
The driving magnet 12 generates a force in the opposite direction to the pulling force, and acts in a direction to expand the inside of the gap A.

Note that this force can be set so that it is not large enough to overcome the tensile force of the drive magnet 12. As described above, according to the present invention, a static pressure difference is generated on both sides of the driven magnet, and the force due to this pressure difference is applied directly to the driven magnet, thereby relaxing the attractive force between the magnets and causing the driven magnet to The load on the bearing in the horizontal direction can be reduced, and sliding wear can be kept to a minimum.

Although the above embodiment is a corner-centered rotary pump, it goes without saying that the present invention is not limited to pumps and can be applied to other rotating equipment. Moreover, the fluid to be flowed into the empty chamber may be gas other than liquid.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an eccentric pump embodying the present invention, FIG. 2 is a side view thereof, FIG. 3 is a sectional view of the same essential part, and FIG. 4 is a plan view of the essential part of the pump section. 1...Pump case, 2, 3...Empty chamber, 6...Driven magnet, 10...Top bearing, 11...Seal Plate, 12... Drive magnet, 13... Motor shaft, 14... Pump rotor, 17... Shaft, 18... Bearing. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 In a device that transmits rotational power by magnetic coupling with a pair of magnets facing each other, the driven magnet is installed in a closed space, and the width of the gap on the side connected to the driving magnet is made larger than the width of the gap on the non-coupled side. A magnetically coupled rotation transmission device characterized in that a difference is created in the relative velocity between a driven magnet and a fluid within the closed space.