WO2002044567A1

WO2002044567A1 - Rotary-piston pump

Info

Publication number: WO2002044567A1
Application number: PCT/EE2000/000005
Authority: WO
Inventors: Jüri Keikov; Ilja Keikov
Original assignee: Keikov Jueri; Ilja Keikov
Priority date: 2000-11-28
Filing date: 2000-11-28
Publication date: 2002-06-06
Also published as: AU2001218530A1; UA74607C2

Abstract

With the given invention the following improvements of the known rotary-piston pump (International Application PCT/EE96/00003) have been achieved: lowered the strength impacts between the pistons and rotor by the means of using an external half arch (2) that have been connected by the means of a usual Hook's articulation; lowered the hydrodynamic resistance of the rotary/piston group thanks to the grooves (9) that have been made in the areas of the external surfaces of the end intersections of the arch/shaped pistons; simplified achieving of higher preciseness in the technology of making the body thanks to the separation of the body into two half bodies (10 and 11) with a level (12) which is perpendicular with axes of one arch of the rotary/piston pump.

Description

ROTARY - PISTON PUMP

The invention belongs into the sphere of mechanical engineering and it can be used in pumps and other machines the construction of which supports on the invention «Rotary-piston pump» (International Application PCT/EE96/00003, International Filling Date 13 December 1996, Applicants and Inventors: Keikov Jiiri and Keikov Ilja).

Cinematically the Rotary-piston pump is a Hooke's articulation the construction of which has been changed. In a round-shape crossing there are under an angle in two groovy revolving surfaces pistons that are located on arches that are under an angle, the axes of which intersect in the centre, of a rotor. The body is disc-shaped, with an opening that goes through and the interior surface of which is a shape of a spherical area. The pistons and the rotor have a spherical overall exterior surface with the same measure and are located in the through-going opening of the body. The elements of the rotary-piston group form four moving chambers the volume of which increases from one side of the body and decreases from the other side as the rotary-piston group revolves.

The Rotary-piston pump has the following drawbacks:

1. The changing speed of revolving of the assistant arch in the case of a constant speed of revolving of the driver's arch creates additional reciprocal strength impacts in the piston- rotor group. 2. The existence of a local hydrodynamic resistance in the sphere of the exterior surface of the arch-shaped pistons' intersection. 3. An unsatisfactory technology of the disc-shaped body because of that the separation of the body into halves is on a level surface in which are located the axes of the both arches.

The aims of the invention are as follows:

1. Decreasing the strength impacts of the elements of the rotary-piston group. 2. Decreasing the local hydrodynamic resistances of the rotary- piston group. 3. The improvement of the technology of the body.

The aims of the invention have been achieved with the help of the following means:

l. The arch of the driver consists of two parts - the interior arch and the exterior half arch that have been connected by the means of a usual Hooke's articulation. As the angel of the reciprocal location of the parts of the arch change, the change of rotation divides between the arches of the piston- rotor mechanism until the constant rotation of the assistant arch. Because of that the extra strength impact between the elements of the piston-rotor group has been removed.

2. In the spheres of the exterior surfaces of the intersections of the arch-shaped pistons grooves have been done that are an o extension of the volume changing chambers. And also the rotary-piston pump has a considerably less hydrodynamic resistance in the regime of the pump.

3. In order to improve technology the disc-shaped body has been separated into half-bodies with a level that is perpendicular with the axes of one arch. The exterior shape of the body may be different from the disc-shaped one because of technological exploitation or other requirements.

In the figure 1 the rotary-piston pump has been given in the open position of its details.

The arch of the driver consists of an internal arch 1, oat one end of which an arch-shaped piston is located and the other end reaches out of the body and from the exterior half arch 2, one end of which is by the means of Hooke's articulation 3 connected with the interior arch 1 and the other end with the motor. The interior arch of the driver's arch 1 and the exterior half arch 2 have been placed under an angle α and they are located on the same level in which is also located the assistant arch 4 of the rotary-piston pump. In case the arches 1 and 4 of the rotary-piston pump are located under the angle β, the value of the angle α may be in the limits of the figure value of the angle β. The exterior half arch 2 may be located in relation to the axes 5 of the interior arch 1 under the angle α. The axes 6 of the arch of the arch-shaped piston and the axes 7 of the sleeves of the fork 8 are parallel.

Into the exterior surfaces of the intersections of the arch- shaped pistons grooves 9 have been done.

The disc-shaped body has been done in joints from two parts - 10 and 11. The level 12 of the separation of the body is such that the centre of the interior surface of a through-going opening of the body that is in the shape of a spherical area is located on this level and so that one arch - from the axes of the arches of the rotary-piston pump is perpendicular with the level 12.

In the case of the equality of the angles α and β and a constant speed of rotation of the arch of the motor the exterior half arch 2 rotates at a constant speed, the interior arch 1 rotates at a changing speed and the assistant arch 4 at a constant speed. Therefore the reciprocal strength impacts between the elements of the rotary-piston group as if a reaction to the assistant arch 4 removed in relation to the phase inertia moments because no angular acceleration of the rotation of the assistant arch 4. will form. When the rotary-piston pump works in the regime of a pump the grooves 9 that are located in the exterior surfaces of the intersections of the pistons increase the width of the free zone of the flow of the liquid thanks to what the hydrodynamic resistance falls.

Thanks to the location of the level 12 of the separation of the body the technology of the preparation of the body has been simplified and a higher exactness of the preparation of the body is possible to achieve.

Claims

CLAIMS :

The rotary -piston pump which consists of the disc-shape body with a through-going opening in which a rotary-piston group is located the round-shape rotor of which has two collars with groovy rotating surfaces which intersect in opposite places that are located diametrically and the arch-shaped pistons locate in the collars of the rotor and have been located on the driver and assistant arch the axes of which cross in the centre of the rotor,

distinguishing by,

the arch of the driver consists of the interior arch 1 and the exterior half arch 2, they have been connected by the means of Hooke's articulation 3 and also the axes of the arch 6 of the arch-shaped piston 5 and the fork 8 of the Hooke's articulation 3 that is located on the interior arch 1, the axes of the sleeves 7 are parallel, in the exterior surfaces of the intersections of the arch-shaped pistons the grooves 9 have been made, the body has been separated into two parts 10 and 11 with a level which is perpendicular to the axes of one arch of the rotary-piston pump and cuts the opening which goes through the body into equal parts.