JPS603999Y2 - vacuum vane pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a vacuum vane pump having a rotor eccentrically supported in a casing and driven in rotation with a suction connection and a discharge connection. Relates to the type of pushbuttons arranged in pairs facing each other on the diametrical line.

Various attempts have been made to ensure that in vacuum vane pumps the individual vanes do not become clamped or locked in their guides and cannot slip out of the guides.

In one known arrangement, a ring-shaped cavity is formed on both end faces of the rotor, which is concentric with the axis of the rotor.

The diameter of this ring-shaped cavity is chosen such that one ring can move freely within it.

In this case, the diameter of the ring placed in the cavity is greater than the smallest spacing between the inner edges of the vanes of the pairs facing each other, so that one of the vanes pushed in pushes the ring. This allows the clamping to push out the other vane in the opposite position.

Since the vanes are usually manufactured from synthetic resin for cost reasons and to reduce inertia and the coefficient of friction against steel, such known configurations have very short inner edges of the vanes. It has the disadvantage that it wears out between the parts.

This is because the rotor is eccentrically mounted so that the ring is in constant contact with the inner edge of the vane.

Therefore, the ring may become ineffective.

In another known arrangement, instead of using rings, the vanes facing each other are connected to each other by freely movable pins.

In this case the pin engages in a hole formed in the inner edge of the vane.

The length of the pin is designed to be longer than the smallest spacing between the inner edges of the vanes facing each other, as is the diameter of the ring, and the pin is practically always based on the eccentric bearing of the rotor. It hits the bottom of the hole.

The pins therefore wear out in a very short time.

Another disadvantage of such pins is that, due to the constant reciprocating movement of the vanes, the center of gravity of the pin is not always located on the axis of the rotor, thus creating an uneven mass distribution inside the pump. be.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to ensure that a vane clamping or locking condition never occurs, and that the vane coupling device operates without wear and tear.

To achieve this object, the invention provides that, in the type mentioned at the outset, at least one pin in each vane is arranged immovably as a spacer on the side facing the axis of the rotor and is arranged in the rotor. The vanes are guided to slide very freely and independently of each other under the influence of the forces acting on them, and the length of each vane, including the pin, is not tightened or locked in its innermost position. One of the vanes was pushed out by the inward movement of the other diametrically opposed vane so that it was dimensioned for tightening or unlocking.

In this case, it is advantageous to arrange two pins on each vane in order to avoid rattling or tilting of the vane when it is pushed out.

In the configuration of the present invention, the pins of the opposing pairs of vanes come into contact with each other only when the vanes are in the tightened state at their bottom dead center position.

The occurrence of vane clamping or locking in a position other than the bottom dead center position is avoided because the vane is forced completely into the inner surface of the housing due to the eccentric bearing of the rotor.

When the connecting pins are arranged as in the present invention, they hardly wear out.

This is because the condition of vane tightening is almost non-existent.

Another advantage of the inventive arrangement is that each vane has the same number of pins, so that the vanes and thus the rotor are balanced.

A sleeve is fitted over one of the corresponding pins of the diametrically opposed pair of vanes, the free end of the sleeve having an inner diameter larger than the outer diameter of the pin. Such an embodiment has the advantage that the pins are in reliable contact with each other over the entire surface of their free end faces.

Embodiments of the present invention will be specifically described below with reference to the drawings.

The vacuum vane pump shown in FIG. 1 includes a casing 1, a rotor 2, vanes 3 movable in the radial direction within the rotor 2,
In the area of the front end face of the rotor 2, it is separated from the shaft 4, which is rotatably supported by a ball bearing 13, the oil supply hole 5, the suction connection 6 and the discharge connection 7.

A shaft 9 is screwed to the rear end face of the rotor 2 (FIG. 2).

Of course, it is also possible to connect the shaft to the rotor in other ways.

The direction of rotation of the pump is indicated by arrow 8.

Excess lubricating oil supplied through the oil supply hole 5 escapes through the discharge connection 7.

FIG. 2 shows a secondary section of the pump.

The pins 11 of the pair of vanes 3, which are located at right angles to the plane of the drawing,
are placed at a smaller distance from each other.

When the lower vane of FIG. 2 is in the tightened or locked condition, the pin 10 of the upper force vane partially pushes the lower vane out during the vane push-in movement.

This causes the vane to tighten or lock, mainly due to contamination during guidance.

In this way the vane can regain its function again.

A pair of vanes is shown in FIG.

A sleeve 12 is placed over the pin 10.

The inner diameter of the sleeve 12 is slightly larger than the outer diameter of the pin.

[Brief explanation of the drawing]

FIG. 1 is a front view of the vacuum vane pump, FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a perspective view of a pair of vanes. 1...Casing, 2...Data, 3.
...Vane, 4...Axis, 5...
Oil supply hole, 6... Suction connection, 7...
Discharge connection part, 8...arrow (indicating direction of rotation), 9...shaft, 10 and 11...zen, 1
2... Sleeve, 13... Ball bearing.

Claims (1)

[Claims for Utility Model Registration] 1. A vacuum vane pump having a rotor eccentrically supported and rotationally driven in a casing with a suction connection and a discharge connection, the pump being capable of radial movement within the rotor. In a type in which the arranged vanes are arranged in pairs facing each other on the diameter line of the rotor, each vane 73
at least one pin 10.11 as a spacer,
It is arranged immovably on the side facing the axis of the rotor 2 and is guided in such a way that the vanes 3 arranged in the rotor 2 slide very freely and independently of each other under the influence of the forces acting on them. , each bay 73 including pins 10.11
The length of the vane is determined to be such that one vane, which is tightened or locked at the innermost position, can be pushed out and released from the locking or locking by the inward movement of the other vane that is diametrically opposed to the other vane. A vacuum vane pump characterized by: 2. A sleeve 12 is inserted into one of the corresponding pins 10 or 11 of the vanes 3 that face each other on the diametrical line, and the free end of the sleeve is attached to the outer diameter of the pin 10 or 11. The vacuum vane pump according to claim 1, which has an inner diameter larger than that of the utility model.