JPS606632Y2 - eccentric rotary pump - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an eccentric rotary pump, and relates to vanes in a rotor and a protruding biasing structure of the vanes, in which the differential pressure of the pump is utilized by the reciprocating motion of the vanes. It was designed to be added to the feathers.

Generally, in an eccentric rotary pump, the number of revolutions is increased in order to reduce the volume of the pump body without reducing the pump flow rate.

When this rotational speed is increased, the blades of the rotor are also required to reciprocate at high speed.

If the reciprocating movement of the blades is not sufficient, there is a problem that the blades will separate from the eccentric ring and the pump performance will deteriorate.

For this reason, as shown in FIG. 9, in order to prevent the blades 3 held in the grooves 2 of the rotating body 1 from separating from the eccentric ring 4, a spring 5 is provided to push out the blades 3 into the grooves 2. A method of increasing the load on the spring 5 has been taken, but this increases the sliding friction of the blades 3 and poses a problem in durability.

In other words, although it is a good idea to increase the force pushing out the blade 3 only in the area where the pumping action is performed, relying only on the spring force is undesirable because the load applied to the blade tip increases in the entire sliding part. .

Therefore, the blade 3 is provided with a high-pressure inlet 6 that opens from the tip to the rear end, and the pressure in the high-pressure region A is guided to the inner bottom of the groove 2 only in the region where the pumping action is performed, thereby increasing the differential pressure with the low-pressure region inlet. A method of pushing out the blades 3 using the pump has been considered, but increasing the area of the high pressure inlet 6 goes against the purpose of downsizing the pump itself, and this measure cannot be taken.

The spring 5 is normally placed at the bottom of the blade 3, but for this purpose the groove 2 must be made deep, so the rotating body 1
There is a problem when is small.

On the other hand, if the spring 5 is held using the high pressure inlet 6 of the blade 3, the spring 5 will resist the introduction of high pressure, resulting in poor propagation of the high pressure, making it impossible to obtain the desired reciprocating motion of the blade 3. There is no problem.

The present invention solves these problems and will be described below with reference to FIGS. 1 to 8 showing one embodiment.

In the figure, reference numeral 7 denotes a pump case made of a synthetic resin material, which has a chamber 8 for housing the pump part on the negative side and a chamber 9 for housing a magnet for rotation transmission on the other side.

These chambers 8 and 9 are coaxial and communicate with each other at their centers.

Two communication ports 10 and 11 for suction and discharge of fluid are provided in the side wall of the chamber 8 for housing the pump unit so as to communicate with each other.

A driven magnet 12 is provided within the empty space 9 .

The driven magnet 12 is formed into a disk shape by molding a magnet 13 and a yoke plate 14 with synthetic resin, and has a shaft coupling hole 15 in the center.

Also, in the center of the outer end face is an end face bearing 16 with a rounded top.
have.

The outer diameter of the driven magnet 12 is slightly smaller than the inner diameter of the cavity 9, and therefore it is rotatable within the cavity 9.

A seal plate 17 made of a non-magnetic material is attached to the opening of the cavity 9 with screws.

The top of the end bearing 16 of the driven magnet 12 is in contact with the seal plate 17.

A driving magnet 18 is disposed outside the seal plate 17 .

This drive magnet 1B is the shaft 1 of a motor (not shown).
9 and corresponds to the aforementioned driven magnet 12, so that the driving magnet 18 and the driven magnet 12 are magnetically coupled.

A pump section is provided in the other cavity 8 of the pump case 7.

This pump section includes a rotor 20, an eccentric ring 21 surrounding the rotor 20, pump chamber side plate members 22 located on both sides of the rotor 20 and forming a pump chamber with the eccentric ring 21, and a shaft 23 of the rotor 20. It is composed of a bearing 24 that is coupled to the pump chamber side plate member 22 and holds a shaft 23.

As shown in FIGS. 3 to 8, the rotor 20 consists of a disc-shaped rotating body 25 having a required wall thickness, blades 26, two side plates 27, and a shaft 23.

The rotating body 25 has a plurality of grooves 28 extending from the inside toward the outer circumferential line on a line parallel to the diameter line and offset from the center, and open at the outer circumferential edge.

This groove 28 is cut out so that the tip of the opening on the short side a far from the center of the rotating body 25 is inward from the outer circumferential line of the rotating body 25, and has a side perpendicular to the short side a. are doing.

The width of the blade 26 is approximately equal to the thickness of the rotating body 25, and the blade 26 is formed in a cross-sectional shape that fits the groove 28.The width of the blade 26 is reduced at the tip and an L-shaped surface 30 is formed by a notch in the portion facing the rotation direction. have.

Furthermore, the blade 26 has a first end and has a high pressure introduction hole 31 that opens at the rear end from an opening that is continuous on two sides of the L-shaped surface 30.

The blade 26 is inserted into the groove 28 of the rotating body 25 so as to be able to reciprocate, and a part of the spring 32 provided at the inner bottom of the groove 28 is inserted into the high pressure introduction hole 31, and the spring 32 causes the blade 26 to be pushed in the projecting direction. Forced.

The shaft 23 is coupled to the rotating body 25 so as to pass through its center.

The side plate 27 is made of a relatively smooth stainless steel material,
The outer diameter is equal to that of the rotary body 25, and the rotary body 25 is coupled to the shaft 23 and overlapped on both sides of the rotary body 25.

The eccentric ring 21 is formed into a cylindrical shape with an outer diameter that matches the cavity 8 of the pump case 7, and a circular hole forming the inner circumference is eccentric with respect to the outer circumference.

This eccentric ring 21 has a width approximately equal to the rotating body 25 of the rotor 20, and is slightly larger than the width of the blades 26, and has cutout portions 33 and 34 for fluid inflow and outflow. .

This eccentric ring 21 is fitted into the cavity 8 of the pump case 7 and surrounds the rotating body 25 of the rotor 20.

The pump chamber side plate member 22 is formed into a dish shape with an outer shape that fits the cavity 8 of the pump case 7, and has the rotor 2 on the inner side.
It has a recessed portion in which the side plate 27 of No. 0 fits loosely.

Furthermore, a cylindrical bearing 24 is fixed to the center.

This bearing 24 holds the shaft 23 of the rotor 20, and its end on the rotor side projects so as to have a slight height above the inner bottom surface of the recess.

This pump chamber side plate member 22 is fitted into and fixed to the cavity 8 of the pump case 7, and is arranged so as to correspond to both side surfaces of the rotor 20, and forms a pump chamber with the eccentric ring 21.

The opening of the empty chamber 8 in which the rotor 20, pump chamber side plate member 22, etc. are housed in the pump case 7 is closed with a lid 35.

Note that one end of the shaft 23 of the rotor 20 described above is coupled to the driven magnet 12.

The eccentric rotary pump of the present invention is constructed as described above, and when the motor shaft 19 is rotated, the driving magnet 18 is rotated, and this rotational torque is transmitted to the magnetically coupled driven magnet 12.

When the driven magnet 12 rotates, the rotor 20 coupled thereto rotates.

The tips of the blades 26 of the rotor 20 are brought into contact with the inner wall of the eccentric ring 21 in advance due to the biasing force of the spring 32 in the groove 28 of the rotor 25, and as the rotor 20 rotates, the eccentric ring 21, the rotor 25, and the blade 26 are brought into contact with the inner wall of the eccentric ring 21. Continuously change the volume of the space constituted by, and by this change in volume, fluid is sucked from one of the two cut parts 33, 34,
Performs a pumping action to flow out from the other side.

When the rotating body 25 rotates at high speed and the pumping action is sufficiently performed, the pressure in the high pressure region A of the pump is sent into the inner bottom of the groove 28 through the high pressure inlet 31.

This pressure generates a force that brings the vanes 26 into close contact with the inner surface of the eccentric ring 21 due to the pressure difference between the pressure at the low-pressure region port of the pump, and the pumping action can be performed without any trouble even at high speed rotation.

However, when the pump is miniaturized and rotated at high speed to obtain a predetermined flow rate, high pressure must be efficiently applied to the vanes 26.

In particular, the present invention is characterized in that an L-shaped surface 30 is formed by cutting out the rotation advancing side of the tip of the blade 26 of the rotor 25.
Since the opening 1 is formed across two sides of the above-mentioned face, the opening is large, and high-pressure fluid flows in from two directions: the axial direction of the blade 26 and the rotating side, and the high-pressure introduction is effective. It is.

The resistance loss of the spring 32 inserted into the high pressure introduction hole 31 of the blade 26 can be sufficiently compensated for by the size of the opening.

As explained above, the present invention allows the opening area of the high pressure inlet to be large, and as a result, even if the spring is inserted into the high pressure inlet, the high pressure inlet function will not be damaged, and a stable blade extrusion function is ensured. At the same time, since the spring can be inserted into the blade, there is no need to provide a separate space for inserting the spring, and the entire structure can be made compact.
It has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an eccentric rotary pump according to an embodiment of the present invention, FIG. The figure is a side view of the rotor, FIG. 6 is a plan view of the rotor and eccentric ring portion, FIG. 7 is a plan sectional view of the same essential part, and FIG. 8 is a. FIG. 9 is a plan view of the main part of a conventional eccentric rotary pump. 7... Pump case, deceased... vacant, 12
... Driven magnet, 20 ... Rotor, 21 ... Eccentric ring, 22 ...
...Pump chamber side plate member, 23...Shaft, 24...
... Bearing, 25 ... Rotating body, 26 ...
...Blade, 27...Side plate, 28...Groove, 30...L-shaped surface, 31...High pressure introduction hole, 32... ·spring.

Claims (1)

[Scope of utility model registration request] A rotary body is rotatably provided in an eccentric ring provided in a pump case, and a groove is formed on the outer periphery of the rotary body, and a blade is inserted into the groove so as to be freely retractable, so that when the rotary body rotates, the blade is In an eccentric rotary pump in which the tip of the blade slides on the inner wall of the eccentric ring, the rotation direction side of the tip of the blade is cut out to form an L-shaped surface, and the opening is formed between two surfaces of the bent surface. What is claimed is: 1. An eccentric rotary pump comprising: a high-pressure introduction hole that spans the blades, has a stopper at the end, communicates with the rear end of the blade, and has a spring inserted into the high-pressure introduction hole.