JPS6250672B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a means for improving the rotor section of an eccentric rotary pump and reducing its mechanical torque consumption.

Generally, as shown in Fig. 7, an eccentric rotary pump consists of a blade 1, a disc-shaped rotating body 2 that holds the blade 1 so as to protrude in the outer circumferential direction, and a shaft 3 connected to the rotating body 2. A rotor 4 is constituted, and this rotor 4 is rotatably installed in an eccentric ring 5, and a main part of the pump is constituted by a side wall member 6 and a bearing 7, which together with the eccentric ring 5 constitute a pump chamber. By the way, with this kind of configuration,
When the shaft 3 receives some force in the axial direction, the rotating body 2 comes into contact with the side wall member 6. Since this rotating body 2 has considerably larger dimensions than the shaft 3, when the rotating body 2 starts to make solid contact with the side wall member 6, the moment becomes a large value because of the large contact surface, and mechanical loss increases greatly. do. Furthermore, the side surface of the blade 1 held by the rotating body 2 is exposed toward the side wall member 6, and considering the movement of the blade 1, the side part of the blade 1 performs circular motion with respect to the side wall member 6, and at the same time It performs a complicated sliding movement of reciprocating motion, which also causes large mechanical losses. Furthermore, if a gap is provided between the rotor 4 and the side wall member 6 in order to prevent solid contact as much as possible, fluid will leak through this gap, resulting in a decrease in pump efficiency.

The present invention provides an eccentric rotary pump in which the rotor has a laminated structure, the rotor itself is provided with an axial movement restricting means, and the rotor receives an axial force at the center of the shaft, thereby reducing mechanical loss. Even if the blade receives a force in the axial direction, this force is received by the side plate, thereby further reducing mechanical loss. Furthermore, by loosely fitting the side plate into the recess of the pump chamber side plate member,
A high-speed rotation gap is created between the side plate and the pump chamber side plate member, and the fluid viscosity effect due to this high-speed rotation prevents fluid leakage and a decrease in pump efficiency.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The eccentric rotary pump of the present invention will be described below with reference to FIGS. 1 to 6 showing one embodiment.

In the figure, reference numeral 8 denotes a pump case made of a synthetic resin material, which has a chamber 9 on one side for housing the pump part and a chamber 10 on the other side for housing a magnet for rotation transmission. These chambers 9 and 10 are coaxial and communicate with each other at their centers. Two communication ports 11 and 12 for suction and discharge of fluid are provided in the side wall of the chamber 9 for housing the pump unit so as to communicate with each other.

Empty room 1 for storing the magnet part for rotation transmission
A driven magnet 13 is provided inside the magnet. This driven magnet 13 is the magnet 14
A yoke plate 15 is molded from synthetic resin to form a disk shape, and has a shaft coupling hole 16 at the center. Further, the outer end face has a recess 17, and an end face bearing 18 having a rounded top is attached to this recess 17. The outer diameter of the driven magnet 13 is slightly smaller than the inner diameter of the cavity 10, and therefore it is rotatable within the cavity 10. A sealing plate 20 made of a non-magnetic material is provided at the opening of the cavity 10 via a packing 19, and this sealing plate 20 is attached with screws 21. The top of the end bearing 18 of the driven magnet 13 is in contact with the seal plate 20. A driving magnet 22 is disposed on the outer side of the seal plate 20. This driving magnet 22 is attached to a shaft 23 of a motor (not shown) and corresponds to the aforementioned driven magnet 13, so that the driving magnet 22 and the driven magnet 13 are magnetically coupled.

In the other empty chamber 9 of the pump case 8, a pump portion, which is a feature of the present invention, is provided. This pump section includes a rotor 24 and an eccentric ring 2 surrounding the rotor 24.
5, pump chamber side plate members 26 located on both sides of the rotor 24 and forming a pump chamber with the eccentric ring 25, a shaft 27, and a bearing 28. As shown in FIGS. 3 to 5, the rotor 24 consists of a disk-shaped rotating body 29 having a required wall thickness, blades 30, two side plates 31, and a shaft 27. This rotating body 29 has a plurality of grooves 32 extending from the inside toward the outer circumferential edge and opening at the outer circumferential edge.
The blade 30 is inserted into this groove 32. The blade 30 has a pressure introduction hole 33 in the axial direction, the width of which is approximately equal to the thickness of the rotating body 29, and a groove 32.
The tip is biased by a spring 34 provided at the inner bottom of the rotating body 29 in a direction to protrude from the outer edge of the rotating body 29. The shaft 27 is coupled to the rotating body 29 so as to pass through its center. The side plates 31 are made of a stainless steel material with relatively good sliding properties, have the same outer diameter as the rotating body 29, are coupled to the shaft 27, and are stacked on both sides of the rotating body 29.

The eccentric ring 25 is formed into a cylindrical shape with an outer diameter that matches the cavity 9 of the pump case 8, and a circular hole forming the inner circumference is eccentric with respect to the outer circumference. This eccentric ring 25 has a width approximately equal to that of the rotating body 29 of the rotor 24, and is slightly larger than the width of the blades 30, and includes cutout portions 35 for fluid inflow and outflow.
It has 36. This eccentric ring 25 is fitted into the cavity 9 of the pump case 8 and surrounds the rotating body 29 of the rotor 24.

The pump chamber side plate member 26 is formed into a dish shape with an outer diameter that matches the cavity 9 of the pump case 8, and has a recess 37 with an inner diameter on the inner side into which the side plate 31 of the rotor 24 fits. Furthermore, a cylindrical bearing 28 is fixed to the center. This bearing 28 is the rotor 24
The rotor-side end 38 protrudes slightly higher than the inner bottom surface of the recess 37. This pump chamber side plate member 26 is fitted and fixed into the cavity 9 of the pump case 8 and is arranged so as to correspond to both sides of the rotor 24, and forms a pump chamber with the eccentric ring 25. Note that the rotor 24
FIG. 6 shows a state in which the pump chamber side plate member 26 and the pump chamber side plate member 26 are combined into one structure.

A lid 40 is attached with screws 41 via a gasket 39 to the opening of the chamber 9 in which the rotor 24 and the pump chamber side plate member 26 of the pump case 8 are housed. Note that the shaft 27 of the rotor 24 mentioned above
One end of the magnet is coupled to the driven magnet 13.

The eccentric rotary pump of the present invention is constructed as described above, and when the motor shaft 23 is rotated, the drive magnet 22 rotates, and this rotational torque is transmitted to the driven magnet 13 which is magnetically coupled. When the driven magnet 13 rotates, the rotor 24 coupled thereto rotates. The blades 30 of this rotor 24 are connected to the springs 30 in the grooves 32 of the rotating body 29.
Due to the biasing force of change. Due to this volume change, two resection parts 35 and 36 are created.
It performs a pumping action that draws fluid in from one side and flows it out from the other.

Especially in the eccentric rotary pump of the present invention, side plates 31 are stacked on both sides of a rotating body 29 for holding the blades of the rotor, and further, axial movement is slightly controlled between the side plates 31 and the inside of the pump chamber side plate member 26. Since it is restricted by the surface of the protruding end portion 38 of the bearing 28, even if an axial force is applied, the inner surface of the pump chamber side plate member 26 and the outer surface of the rotating body 29 do not come into contact, and the side plate 31 and the bearing The contact 28 occurs near the axis 27, and since the radius is small in terms of moment, the value can be kept small. Furthermore, looking at the movement of the side portions of the blades 30, since the side plate 31 rotates at the same speed as the rotating body 29, rotational movement is eliminated and only reciprocating movement occurs. From this, feather 30
It is possible to reduce mechanical loss caused by the machine itself. or,
The outer periphery of the side plate 31 and the recess 3 of the pump chamber side plate member 26
A high-speed rotation gap is created by the rotation of the side plate 31 with respect to the inner periphery of the side plate 7. When fluid leaks from the pump chamber and enters this portion, the fluid is pulled by the side plate 31 due to the viscosity of the fluid, causing it to rotate. Then, compared to the leakage flow that flows in the thickness direction of the side plate 31 when the side plate 31 is stopped, when the side plate 31 is rotating, the flow distance of the fluid is reduced by the amount that flows in the thickness direction and is rotated by viscosity. This increases the fluid passage resistance and prevents leakage flow. This is due to the viscous effect of the fluid.

In this way, the present invention can reduce the mechanical loss between the rotor and the pump chamber side plate member, and also reduce the amount of fluid leaking from the gap between the side plate and the pump chamber side plate member due to the viscosity effect of the fluid. , it is possible to provide an eccentric rotary pump that moves efficiently, and is particularly effective for an electromagnetic coupling drive type in which the rotor is pulled in the axial direction.

[Brief explanation of the drawing]

Fig. 1a is a sectional view of the eccentric rotary pump of the present invention, Fig. 1b is a side view of the same pump, Fig. 2 is a sectional view of the same pump in an exploded state, and Fig. 3a is a rotation of the rotor section. A plan view of the body, Figure 3b is the same side view, Figure 4
5 is a side view of the rotor section, FIG. 5 is a plan view of the rotating body and eccentric ring combined, FIG. 6 is a sectional view of the pump section, and FIG. 7 is a sectional view of a conventional pump section. 8...Pump case, 9...Empty room for housing the pump part, 13...Driven magnet, 24...Rotor, 2
5... Eccentric ring, 26... Pump chamber side plate member, 27
...shaft, 28...bearing, 29...rotating body, 30...blade,
31...Side plate, 32...Groove, 34...Spring, 38
...end of the bearing.

Claims (1)

[Claims] 1. A rotating body for holding blades, which is a rotor member, is rotatably provided in an eccentric ring provided in a pump case, a groove is formed on the outer periphery of the rotating body, and a blade is inserted into the groove so as to be freely retractable. In an eccentric rotary pump in which the tip of the blade slides on the inner wall of the eccentric ring when the rotating body rotates, a pair of side plates having an outer diameter equal to an outer diameter of the rotating body are provided on both sides of the rotating body, and the pair of side plates is coupled to the shaft of the rotating body to sandwich the rotating body to form a rotor, a recess is provided in a pump chamber side plate member having a bearing for holding the rotor, and the side plate is loosely engaged with the recess. An eccentric rotary pump characterized in that the leakage of fluid from the pump chamber is thereby prevented and the axial movement of the rotor is restricted by the end face of the bearing.