EP0670010B1

EP0670010B1 - Mixing pump

Info

Publication number: EP0670010B1
Application number: EP91919126A
Authority: EP
Inventors: Tauno Pirhonen
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-10-19
Filing date: 1991-11-18
Publication date: 1997-05-21
Anticipated expiration: 2011-11-18
Also published as: FI90408B; DE69126220D1; FI905159L; EP0670010A1; WO1993010352A1; FI90408C; FI905159A0; DE69126220T2

Abstract

A mixing pump for liquids comprised of a pressure fluid driven two-chamber pumping unit (4, 9, 7) and a two-chamber feeding unit (6.14.15) for supply of an additive, which is to be mixed, in both of which the chambers are separated from each other with a piston or a membrane. The pressure fluid driven pumping unit is connected by means of arms (3, 5, 12), which transmit the pumping motion to a steplessly adjustable two-chamber piston pump or membrane pump that is utilized as a feeding unit.

Description

The invention relates to a mixing pump by means of which it is possible to mix certain additives, such as soap solutions, emulsifiable oils etc. for instance to water as disclosed in eg. DK-A-138 277 (corresponding to US-A-3 926 345).
In present solutions the emulsion is mixed in a storage tank, from where it is transmitted, in pressurized state, to the place of use. In present methods problems arise by the impurity of water, lime in the first place, which makes sliding surfaces, filters and pipe lines dirty, because in the storage tank lime residue settles from the emulsion and is drifted forward leading to said disadvantages. In addition, the emulsion is most apt to get and also to produce bacteria and yeast fungi in the storage tank, whereby the function of apparatus is disturbed.
With a mixing pump according to the invention a decisive improvement of the disclosed disadvantages is achieved. The invention is characterized in what is presented in the patent claims.
The most important advantage of the invention can be considered the fact that it is possible to get totally rid of the storing of the mixed emulsion and neither do the impurities of water cause problems when on the water-transmitting side a membrane batcher is utilized. By means of a double-acting piston pump on the oil side, an accurate concentration for the emulsion is produced and by means of stepless adjustment of the stroke an accurate percentage regulation of the emulsion concentration is achieved. Since the mixing pump is strong and simple, service and maintenance costs are saved and reliability guaranteed.
In the following the invention is defined more closely according to figure 1 of the enclosed drawing, where the function of the mixing pump is diagrammatically illustrated.
On device frame 11 shown in the figure, a membrane pump 4, 7, 8, 9 and a piston pump 6, 12, 14, 15 are mounted by means of articulated joints 17 and joined together with arms 3,5. The oil, which is to mixed, enters the piston pump along a tube line (ö) and is fed forward to the membrane pump along line 16. The water, in which oil is to be mixed in this case, enters the membrane over two different tube lines (V₁), (V₂). From the membrane pump the water travels along two routes either over valve 1.1 or 1.2 to the departing emulsion line (E), to which also the oil enters it along line 16. The inlet of pressurized water to the membrane pump is adjusted by valves 2.1 and 2.2. When the mixing pump is swithched on, the valves 2.1 and 1.2 are opened. The water then flowes over valve 2.1 to the chamber, formed by the one half 4 of the pump, and presses piston 7 and membrane 8 against the other pump half 9, whereby the water flows over valve 1.2 from the chamber, formed by the pump half 9, to line (E). When the arms 3,5 are then moving to the right according to the figure, the membrane pump pumps, simultaneously, the oil by means of piston 15 from chamber 6 over directional valve 13 to line 16 and further into the water flowing in line (E). New oil is then sucked by the piston pump chamber 14 through directional valve 13 from line (ö).When the piston of the membrane pump is shifted so much to the right that the extension of arm 5 reahces the right-side motion guard 10, the valves 2.1 and 1.2 are closed electrically and valves 1.1 and 2.2. opened at the same time. Then the water flowing over the pressurized water line V₂ presses the membrane pump piston 7 to the left and the water from the chamber, which is formed of the one pump half 4, to line (E). Correspondingly, the piston pump presses now oil from chamber 14 to line 16 and into the water in line (E). This motion of the membrane pump is restricted by the left-side motion guard 10, which gives an impuls to change the functions of the valves in the water lines.
The pumping energy of the mixing pump is taken from the energy of the water pressure. The adjusting valves can be electrically controlled but mechnical control is also possible.
Regulation of the oil volume in relation to the flow of water is made by shifting the location of thefixing point of attachment of the piston pump piston rod 12 in arm 5. The attachment by means of part 18 can be done within distance (S) on arm 5. By means of this regulation the stroke of the piston pump is changed. Naturally, the introduced piston pump can be replaced also by a membrane pump and the introduced membrane pump by a piston pump.
The linearity of the mixture can be improved by many means. The cross-section ratio of the piston rod and piston/membrane in both pumps can be brought closer in relation to each other and an improvment can also be achieved by changing the mutual function of the pumps so that in both ones the piston rod moves inward at the same time and outward at the same time.

Claims

A mixing pump for liquids which pump comprises by means of pressurized liquid driven two-chambered pumping unit (4,9,7) which is coupled with move transmitting arms (3,5, 12) to a piston or membrane pump (6,14,15) which is proportionally adjusted, having two chambers and working as a feeding unit for mixed additive characterized in that the feeding unit (6,14,15) is coupled to mix the additive to that pressurized liquid which is driving the mixing pump (4,9,7).
A mixing pump according to claim characterized in that the additive is mixed to the pressurized driving liquid (V1,V2) after the mixing pump (E).
A mixing pump according to claim 1 or 2 characterized in that the back and forth running move of the pump is maintained by opening and closing mechanically or electrically controlled valves (1.1),(1.2),(2.1),(2.2).