CZ103493A3 - Device for driving a piston of a valveless piston pump - Google Patents

Abstract

A device for driving a piston of a piston-free piston pump, wherein the rotary and axial movement of the piston (11) attached to the shaft (1) is provided by a shaft (1) mounted in the frame (2) rotationally and in a toothed manner attached to the shaft (1) a wheel (5) and an axial cam (3) which is in contact with the rolling wheel (4) mounted in the frame (2), the gear (5) being driven by a pinion (6).

Description

(57) A device for driving a piston of a non-valve piston pump, wherein the rotational and axial movement of the piston (11) attached to the shaft (1) is provided by a shaft (1) mounted rotatably and slidably in the frame (2); a gear (5) and an axial cam (3) which are in contact with the roller (4) mounted in the frame (2) are fixed, the gear (5) being driven by a pinion (6).

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A device for driving a piston of a non-valve pump.

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BACKGROUND OF THE INVENTION The present invention relates to a piston drive of a non-valve piston pump in which the valve function is performed by rotational movement of the longitudinally cut piston, while simultaneously sliding the piston.

BACKGROUND OF THE INVENTION

To date, the piston to perform both rotational and translational motion is driven by an articulated mechanism comprised of two shafts such that the drive shaft drives a shaft driven by an eccentrically mounted joint. If the drive shaft is at an angle other than 180 degrees to the drive shaft, the driven shaft performs a sliding motion in addition to the rotary motion. A disadvantage of this arrangement is that the sliding movement is coupled to the rotational movement by a sinusoidal function which does not allow for optimal synchronization of both movements. A substantial disadvantage is the difficult realization of the mechanism for large axial forces in reasonable dimensions and therefore the pump designed in this way is unsuitable for higher pressures (2 MPa and higher). Pumps of this type are suitable for pumping viscous liquids.

The essence of the invention

The above mentioned disadvantages are eliminated by the device for driving the piston of the valveless piston pump, which consists in the fact that the shaft mounted rotatably and sliding in the frame has a piston attached to one end, the gearwheel and an axial cam in contact with the roller the gearwheel is driven by a pinion.

The device according to ν '/ finding allows the shape of the axial cam to select the most suitable dependence of the piston feed on the rotation and ν' / the application of the axial force by the axial cam is technologically and dimensionally / advantageously. At the same time, the use of the gear wheel as a clutch allowing axial movement while simultaneously transmitting the twisting mement substantially simplifies the whole mechanism.

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It goes without saying that the arrangement of the gear and the cam shaft has a number of possibilities, and even the gear can be combined in one piece with the axial cam. From a theoretical point of view, it is advantageous to use a tapered roller which may not have an axis of rotation perpendicular to the shaft. The reciprocating movement of the shaft and thus of the piston is b

can be drawn by a spring or another roller.

It is also possible to drive two or more of the same mechanisms by one pinion and to achieve a more even pumping. Very uniform pumping can be accomplished by the known principle by driving the pinion at the same time with the same mechanism as described above, which moves the compensating piston. The compensating piston recedes when the liquid is displaced, thereby removing excess liquid and, on the contrary, supplying the liquid during the suction stroke.

Advantageously, a helical toothing can be used for the pinion wheel, thus achieving better friction ratios in the toothing for the displacement stroke.

It goes without saying that the same effect can be achieved by fixing the axial cam to the frame and placing the rolling wheel in the carrier on the shaft, although this solution is less advantageous in terms of technology and construction.

Overview of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS FIG. An alternative arrangement with an axial cam mounted to the frame and a roller mounted on the shaft is shown in Fig. 2.

DETAILED DESCRIPTION OF THE INVENTION

The device according to FIG. 1 consists of a frame 2 in which the shaft 11 is rotatably and slidably mounted. A piston UL is mounted to one end of the shaft 11 which performs both rotational and translational movement. An axial cam 1 is coaxially mounted on the shaft 11, which is in contact with the roller with its functional surface. speed on different radii of the functional surface of the axial cam 2. The roller is mounted on the pin 41. At the other end of the shaft 1, a gear 5 is mounted, which is driven by Pinion £ Pinion. it is axially immovable with respect to the frame 2. In this example, the axial restoring force of the shaft 11 is due to the spring 7 supported by the frame 2, which exerts an axial force on the shaft despite the thrust ball bearing 8.

An alternative arrangement is shown in Fig. 2, where the axial cam 2 is fixed to the frame 2 and the rolling wheel 4 is rotatably mounted in the shaft carrier 12 on the pivot. 41.

Claims (2)

PATENT REQUIREMENTS • (1. Apparatus for driving a piston of a non-valve piston pump, characterized in that the shaft (1) mounted rotatably and slidably in the frame (2) has a piston (11) attached to one end, and a gear is attached to the shaft (1). (5) and an axial cam (3) which is in contact with the roller (4) mounted in the frame (2), the gear (5) being driven by a pinion (6). Device according to claim 1, characterized in that the axial cam (3) is rigidly connected to the frame (2) and the roller (4) is rotatably mounted in the carrier (12) of the shaft (1).