JPS6343421Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a compressible fluid pumping device as defined in the generic concept of claim (1) of the patented utility model.

A pumping device of this construction type is described in DE 26 03 462 A1. Compressors according to this principle are characterized by a substantially pulse-free delivery of a gaseous working fluid, for example air or an air-fuel mixture, and can therefore be applied with advantage for purposes of supercharging internal combustion engines. During operation of this type of compressor, a spatula-shaped working chamber is formed surrounding the pumping chamber between the spirally formed pumping body and both peripheral walls of the pumping chamber, and this spatula-shaped working chamber is It moves from there through the pumping chamber to the outlet, its volume decreasing constantly and the pressure of the working medium correspondingly increasing.

In order to guide the disk-shaped rotor with respect to the case without any problems and reliably, in addition to the first eccentric structure, a second eccentric structure is provided with an interval from the first eccentric structure, and its guide shaft is It is forcibly connected to the drive shaft of the first eccentric structure via a gear.

The object of the invention is to simplify the drive mode for a pumping device of the type mentioned above and to reduce the costs thereof.

This problem is solved by the configuration described in the characteristic part of claim (1) of the utility model registration claim. According to the present invention, the second eccentric structure of the known pumping device is replaced by a swinging lever, and the swinging lever is pivoted to the case at one end and to the boss provided at the outer edge of the disc-shaped rotor at the other end. wear. Pivoting the disc-shaped rotor by means of a rocking lever essentially simplifies its overall structure, since the second eccentric structure of the whole, together with its guide shaft, cannot be forcibly connected to this guide shaft. This is because a gear device for driving can be omitted. Since the pivot point of the disc-shaped rotor to the lever does not make a circular motion, but performs an arc-shaped oscillating motion, the individual points of the disc-shaped rotor are more accurate than in conventional pumping devices. They do not move uniformly on circular trajectories; rather, the trajectories of these points are different from each other, and they differ in that they form somewhat deformed, almost arc-shaped trajectories. Therefore, the limiting wall of the pumping chamber does not exactly follow a fixed helical shape, but is slightly modified from this fixed helical shape. However, with today's manufacturing technology, this type of complex shape can be economically fabricated using NC-mechanical or electrochemical processing methods, so this type of shape can rather be created without creating the required trajectory shape. , there are no particularly difficult problems.

The present invention will now be explained in detail with reference to the illustrated embodiments.

The disk-shaped rotor 1 has on at least one of its end faces, preferably on both its end faces, a helical pumping body 2 in the form of a band or a tongue, in the illustrated embodiment two pumping bodies 2 combined with each other. have. Each pumping body 2 is associated with a pumping chamber provided in the stationary case 10, which pumping chamber is in the form of a spiral slit. This pressure-feeding chamber extends from an inlet chamber provided on the outer periphery of the case to an outlet chamber provided on the inner periphery of the case, and has substantially parallel circumferential walls provided at regular intervals, between which there is a pressure-feeding body 2 is held. The shape of the pumping chamber wall formed by the surrounding edges of the locus of points of the pumping body does not, as mentioned above, correspond exactly to the Archimedean spiral shape in the illustrated embodiment, but rather to the shape of the rotor according to the invention. Due to guidance, it is somewhat co-deformed from this Archimedean spiral shape.

The curvature of the spiral pumping main body 2 is defined so as to contact the inner and outer circumferential walls of the pumping chamber at a plurality of positions, for example, at two locations. When the pumping device is operated, the disk-shaped rotor 1 including the pumping body is driven eccentrically, so that the movement limited by the peripheral wall of the pumping chamber is performed on a trajectory somewhat different from a circular trajectory.

By alternately bringing the pumping body close to the inner and outer circumferential walls of the pumping chamber multiple times, a spatula-shaped working chamber surrounding the working fluid is formed on both sides of the pumping main body, and the working chamber eccentrically drives the pumping main body. is moved in the direction of the outlet by means of the pumping chamber, the volume of this working chamber being reduced and the pressure of the working medium being correspondingly increased.

The eccentric drive of the rotor 1 with the pumping body is carried out by eccentric movement devices 4 to 6 in the form of a crank mechanism. In this case, a drive shaft 5 bearing on the case is connected via a lever arm 6 to a shaft pin 4 supported on the rotor 1. The bearing of the shaft pin 4 in the disk-shaped rotor 1 is implemented, for example, by a ball bearing with low friction.

A boss 3 is provided on the outer edge of the rotor 1. One end 8 of a swing arm 7 is pivotally attached to the boss 3, and the other end 9 is swingably supported by a case 10. The supporting structure of this swing lever becomes a second eccentric structure, and when the drive shaft 5 is driven, the disc-shaped rotor 1 is forced to move. In this case, arrow 11
When the drive shaft 5 is rotated as shown in , the swinging lever 7 swings along an arcuate trajectory 12, and at the same time, the pivot point of the disk-shaped rotor 1 also follows such an arcuate trajectory. draw. The locus of each point on the pumping body 2 is therefore not exactly an arcuate locus, but a locus in which the deformation increases as the pivot point of the swing lever 7 is approached. As a result of this, the walls of the pumping chamber, which define the trajectory of the individual points of the pumping body, differ from a constant helical shape.

As mentioned above, manufacturing such a complex shape requires
It can be easily carried out by NC-mechanical as well as electrochemical methods. On the other hand, since the gear mechanism necessary for driving the second eccentric structure is omitted by the second eccentric structure and the first eccentric structure, it is possible to reduce costs.

[Brief explanation of the drawing]

The drawing is a front view showing an end face of a rotor of a pumping device equipped with a driving and guiding structure according to the present invention. Explanation of reference numbers in the figure: 1...rotor, 2...
Pressure feeding main body, 3... boss, 4 to 6... eccentric movement device, 7... rocking lever, 8, 9... rocking lever end, 10... case.

Claims (1)

[Claims for Utility Model Registration] (1) At least one pumping chamber provided within the case and formed as a spiral slit;
It has a pumping body attached to the pumping chamber and also having a spiral band or tongue shape, and the pumping main body is held by a disk-shaped rotor that is driven eccentrically with respect to the case, and during operation, Each point is limited by the circumferential wall of the pumping chamber and moves approximately in the form of a circular arc locus, and its curvature relative to the curvature of the pumping chamber is such that the pumping chamber moves along the inner and outer circumferential walls of the pumping chamber during operation. at least 1 consecutive
In the compressible fluid pumping device, which is set to almost contact the sealed wires of the case 10,
A pumping device characterized in that a swinging lever 7 is provided at a distance from the eccentric motion devices 4 to 6 in order to guide the rotor 1 against the eccentric motion devices 4 to 6. (2) Utility model registration claim (1) characterized in that the swing lever 7 is pivotally connected at one end 9 to the case 10 and at the other end 8 to the boss 3 provided on the outer edge of the rotor 1 The pressure feeding device described in .