WO2004061311A1

WO2004061311A1 - Rotating spyral pump with progressive thread step

Info

Publication number: WO2004061311A1
Application number: PCT/HR2003/000050
Authority: WO
Inventors: Renata Sinko
Original assignee: Nizetic, Tomislav; Keglevic, Kresimir
Priority date: 2002-09-27
Filing date: 2003-09-24
Publication date: 2004-07-22
Also published as: HRP20020780A2; AU2003271992A1; AU2003271992A8

Abstract

Rotating spiral pump with progressive thread step serves for pumping fluid of all kind, it has simple design and consists of the cylinder (1) in which inserted piston (2) is rotating, which may be composed of the sections (7), (8), (9), (10), taking in account that the piston is composed of the axes (3) and the spiral (4) whose outer rib (5) has wider intermediate distance while increasing the distance from the entrance of the pump (6). The piston (2) is made by increasing space volume from the beginning to the end of the piston (2), formed of the axes (3) and spiral (4) together with outer cylinder (1), in which the piston (2) is inserted, therefore the previously described. space volume on the start of the piston (2) is the smallest, and it is wider and wider while the spiral (4) is going fare more from the beginning of the start of the piston (2), finally it will be maximal at the end of the piston (2). Because of progressive increasing the thread step on the spiral of the piston, the fluid velocity as well as the pressure made by rotation of the piston (2) in the cylinder (1) on the entrance (6) and the exit, can reach very high differences, which depends on the difference between the cross-sections on the entrance (6) and the exit, therefore this device can be applied as the special type of pump.

Description

ROTATING SPYRA PUMP WITH PROGRESSIVE THREAD STEP

TECHNICAL FIELD OF THE INVENTION

The invention is relating to pumping of fluids, with the possibility for its application in processing and transporting systems for all kinds of fluids.

TECHNICAL PROBLEM

The technical problem to be solved by this invention comprises the following: how to design a rotating pump, to which hard ingredients would not do any harm, and which would have the possibility to reach high pressure with relatively high flow rate and in spite of small dimensions thereof an increased use of energy, and which would have the possibility to regulate the flow rate by regulating rotating velocity. The next problem, which is to be solved by the proposed technical solution, is a simplified pump installation and easy detection of possible damage accured.

STATE OF THE ART

Different pumps for pumping fluids, the working principle of which is based on different mechanical and hydraulic effects, have been used so far. Two basic groups of pumps are using a mechanical working principle, one in which changing of space volume containing fluid occurs, the other including turbό-pumps, while jet pumps and aero-lift pumps use a hydraulic principle.

The pumps, which use the changing of space volume, are: screw, teethed, propeller, piston, and membrane pumps.

From previously cited pumps - screw, teethed and propeller pumps use circular motion like the turbo-pumps do. Other cited pumps (piston and membrane) use strait line motion for volume changing, while hydraulic pumps (jet and aero-lift) have no mechanically moving parts. The imperfections of the mentioned well-known solutions, especially related to those pumps, which have circular motion, are first of all sensibility to hard ingredients in the fluid to be pumped, which can cause damage of the pump, then the complexity of the design if high pressure is desired to be reached, and in pumps whose design is simple (propeller pump), high pumping pressure cannot be reached.

The aim of the solution contained in this patent application is to design such kind of device-pump which would improve possibilities of the mentioned solutions in a way as to decrease complexity of the design, sensitivity to damages from hard ingredients in pumping fluids, the. dimensions of the pump and, at the same time, give possibility to reach high pressure of pumping fluid.

Description of the solution of the technical problem

This proposed equipment - rotating spiral pump, solves the technical problem defined.

The designed solution of the technical problem is based on placing of a specially designed piston (2) in the cylinder (1) with defined diameter. The piston may be made in one piece, composed of an axis (3), and spiral (4) and its outer rib (5), the distance between outer ribs increases while increasing the distance from the entrance of the pump (6), or may be made of a certain number of sections (7), (8), (9), (10) which are arranged one above the other, taking in account that all must have the same diameter but different height. The way for sections to be arranged is that the first, entering-section, has to be the section which has the smallest distance between spiral line, the second section has bigger -distance between spiral line then the first section, the third section has bigger distance then the second and so on, the last exit-section has the biggest distance between spiral line. The final number of sections is not limited.

Sections (7), (8), (9), (10) which are connected one to another, are composed of axis (3) and spiral (4), taking in account that outer rib (5) of spiral (4) is of the same diameter, and the spiral line, which is winded around the axis, increases its distance in side view, i.e. the distance is bigger if spiral is closer to the exit and smaller if more far away from the entrance of the pump (6). The piston (2) or each section (7), (8), (9), (10), if the piston (2) is formed of sections, are performed in such a way that the space volume, which is formed by the axe (3) and spiral (4) together with outer cylinder (1) in which the piston (2) or sections (7), (8), (9), (10) are inserted, increases from the starting-point to the end of the piston (2) or sections (7), (8), (9), (10), in such a manner that previously described volume space is the smallest on the starting-point (2) or sections (7). (8). (9), (10). and when the spiral (4) is more distant from the starting-point of the piston (2) or sections (7). (8), (9), (10), the volume increases to become the most spacious at the end of the piston (2) or section. The piston or sections (7), (8), (9), (10), together with outer cylinder (1), form a tube (12) whose cross-section (11) is enlarging.

If the piston (2) is formed of sections, sections (7), (8), (9), (10) are connected one to another in such a way that space volume between the axis (3), spiral (4) and outer cylinder (1), at the end of lower section, is smaller then the space bordered by the axe, spiral and outer cylinder on the starting-point of higher section.

Description of the drawings

The invention is described in detail in the example of carrying it out in which

Figure 1 shows rotating spiral pump with progressive thread step, which consists of the cylindrical stationary housing (1) and piston (2) rotating inside. The piston consists of the axe (3) and spiral (4) taking in account that spiral (4) is winded around the axe (3) so the outer rib (5) of spiral line (4) is more and more distant when it is leaving the starting-point of the piston (2) or the entrance of the pump (6).

Figure 2 shows the piston (2) of spiral pump, composed of sections (7), (8), (9), (10) which are connected one to another, in the way that the space volume, between the axes (3), spiral (4) and outer cylinder (1) on the end of lower section, is smaller then the space volume bordered by the axis, spiral and outer cylinder of the starting joint of higher section. Figure 3 shows the tube ( 1 1). which is bordered by the piston (2) and cylinder (1) of spiral pump, and spread in plane view. The cross section of the entrance into the tube is equal to the cross section of the entrance into the pump (6), and is gradually increasing while coming to the end of ;ne pump.

Method of carrying the invention out

The fluid pumped is entering the entrance of the pump (6), whose space is determined. The diameter of the cy linder (1), in which the pump piston (2) lied, is constant as well as the diameter of outer spiral rib of the piston (2). The piston (2) is motor driven, and starts to rotate around its axis in motionless cylinder (1). By rotating the piston (2) in the cylinder (1), a force is generated, pushing the liquid from the entrance (6) to the exit of the pump. A liquid is passing through the spiral tube, which is formed of the piston (2), in other words the axis (3) and spiral ι4) of the piston (2) and outer cylinder (1). If the tube, which is made by changing a thread step, respectively space volume in the way described above, would be spread in plane view, the tube ■ 12) would be obtained in the form shown in fig. 3, whose entrance (11) has minimal cross section area, which is equal to the step entrance of the„pump (6), is gradually widening towards the exit, and the exit has maximum diameter. If the tube described above would be rotating around its axis, the aero-lift force would be obtained, pushing liquid through the tube from narrower to wider end.

With regard to the form of the tube, Bernoully's equation is applicable, which is pointing to the fact that the pressure is decreasing while the velocity is arising, and vice versus.

p/g + v72 + g*h = const. p/g + (v,)²/2 + g*h, = p/g + (v₂)²12 + g*h₂ + W_s

p/g => potential energy change due to the fluid pressure

kinetic energy change due to the fluid velocity g*h => potential energy change due to vertical position W_s => fluid work done on its pathway From the equation above, it is clear that the fluid velocity generated by rotation of the piston (2) in the cylinder (1) on the entrance (6) and the exit, and likewise the pressure on the entrance (6) and the exit, can reach very high differences, depending of the difference between cross-section on the entrance (6) and the exit, so this device may be applied as a special type

> pump.

By determining the number of spiral thread-steps (4) and by the ratio between entering and exiting thread-step, respectively between the volume fulfilled with a fluid on the entrance of the pump (6) and the number of pump rotation, the fluid flow through the pump in time unit is ) determined.

If the pump or inner piston (2) would be composed of the sections (7), (8), (9), (10), by simple selection of the sections, respectively by their arrangement in the way to form the tube (12) such as like in the fig. 3, the pump may be designed with different exiting pressures and

> fluid flows in time unit, without changing outer diameter of the pump, respectively of the cylinder (1) inside which the piston (2) is installed.

Considering that this kind of a pump has no sealing respectively contact surfaces, and rotating parts are made in a single peace, it is resistant to hard particles, and is able to work in ) horizontal, vertical and rake position.

Industrial application of the invention

This invention, entitled spiral pump with progressive thread step, is attended for lifting or transporting fluids with different consistency and viscosity. The invention is applicable in almost all cases in which there is a need for transporting liquids like in oil recovery and processing, in water recovery from artesian wells, and in processing industry.

For application of the technical solution according to this invention it is necessary to apply conventional materials, equipment and processes, under the condition of additional training of the staff for handling this equipment.

Safety working measures are of standard type, and are not environmentally dangerous.

Claims

PATENT CLAIMS

1. Rotating spiral pump with progressive thread step for pumping fluid of different consistency and viscosity, characterised by the fact that it consists of cylindrical housing (1) in which there is the piston (2) composed of the axis (3) and spiral (4), taking in account that spiral pump has progressive thread step which decreases towards the entrance of the pump (6).

2. Rotating spiral pump according to claim (1), characterised by the fact that the piston (2) can be made in one piece or composed of several sections which are formed of the axis (3) and the spiral (4) inside outer cylinder (1) in which they are incorporated, therefore the characteristics of the pump are defined by the selection of the space volume on the starting-point or at the end-point of the piston (2) or starting section and end-section, if the piston consists of the sections (7), (8), (9), (10), by which the height of fluid recover, in other words fluid pressure, is determined, and by the selection of the measure of cross-section of the entrance of the pump (11), the fluid flow is determined.