Multiple displacement pump

Abstract

An arrangement enables production of a multiple displacement pump designed to be activated either with a pneumatic or an electric drive from extensively similar parts or retrofitting of such a pump from one drive type to the other drive type with little effort. For this purpose, the displacer elements can be connected by way of a connection device that can be extended through a lid of the fluid chambers, so that optionally a mechanical actuator can be affixed, which can be connected to an electric drive or to a control valve.

What is claimed is: 
     
         1 . A multiple displacement pump having a pump housing that comprises a first lid ( 2 ) that lies on the outside and a second lid ( 3 ) that lies on the outside, and at least one intermediate piece ( 4 ) that is accommodated between the lids ( 2 ,  3 ), wherein at least two fluid chambers ( 5 ,  8 ) are formed between the lids ( 2 ,  3 ) and the at least one intermediate piece ( 4 ), which chambers are divided, using at least one displacer element ( 11 ,  12 ), in each instance, into at least one propellant chamber ( 6 ,  9 ) and one media chamber ( 7 ,  10 ), and wherein the displacer elements ( 11 ,  12 ) of the at least two fluid chambers ( 5 ,  8 ) are connected, by way of at least one connection element ( 13 ), with force fit and releasably, to at least one lifting rod ( 14 ), wherein the at least one lifting rod ( 14 ) can extend the at least one connection element ( 13 ) through a first passage ( 16 ) of the adjacent first lid ( 2 ),
 wherein the lifting rod ( 14 ) is connected to a first mechanical actuator using releasable connection means ( 43 ), in such a manner, with force fit but releasably, that the drive can be removed and a different drive can be affixed to it, wherein specifically either a pneumatic or an electric drive can be adapted.   
     
     
         2 . The multiple displacement pump according to  claim 1 , wherein the first mechanical actuator is releasably connected to the first lid ( 2 ) on its outer side, which faces away from the first fluid chamber ( 5 ). 
     
     
         3 . The multiple displacement pump according to  claim 1 , wherein the first passage ( 16 ) of the first lid ( 2 ) can be closed off in a propellant-sealed manner. 
     
     
         4 . The multiple displacement pump according to  claim 1 , wherein the first lid ( 2 ) is formed in one piece with a housing of the first mechanical actuator. 
     
     
         5 . The multiple displacement pump according to  claim 1 , wherein pneumatic access openings ( 18 ) that can be closed off in a propellant-sealed manner, for making a connection to a pneumatic drive, are assigned to the lids ( 2 ,  3 ). 
     
     
         6 . The multiple displacement pump according to  claim 5 , wherein the first mechanical actuator is a control valve and that this is activated by the lifting rod ( 14 ) as a function of the deflection position of the displacer elements ( 11 ,  12 ). 
     
     
         7 . The multiple displacement pump according to  claim 1 , wherein the first mechanical actuator comprises an electric drive having a changing direction of rotation, which interacts with the lifting rod ( 14 ). 
     
     
         8 . The multiple displacement pump according to  claim 7 , wherein the first mechanical actuator comprises an electric motor ( 19 ) that interacts with a ball screw ( 20 ) or a thread ( 21 ), which are optionally assigned to the lifting rod ( 14 ). 
     
     
         9 . The multiple displacement pump according to  claim 1 , wherein the first mechanical actuator comprises a cam ( 22 ) that is accommodated on an axis of rotation that is connected to an electric motor directly or with the interposition of a gear mechanism, which cam is enclosed by a rotating bearing ( 23 ), which in turn is mounted so as to pivot on one end of the lifting rod ( 14 ). 
     
     
         10 . The multiple displacement pump according to  claim 1 , wherein the first mechanical actuator comprises a cam ( 22 ) that is accommodated on an axis of rotation that is connected to an electric motor directly or with the interposition of a gear mechanism, which cam activates a spring-loaded tappet ( 24 ), which in turn is formed by the lifting rod ( 14 ). 
     
     
         11 . The multiple displacement pump according to  claim 10 , wherein the tappet ( 24 ) moves out toward the cam ( 22 ) against a stop. 
     
     
         12 . The multiple displacement pump according to  claim 1 , wherein the lifting rod ( 14 ) is connected to an armature ( 26 ) of a pulling magnet ( 25 ), which is spring-mounted relative to a fixed yoke ( 27 ) and can be electromagnetically activated by applying current to an exciter coil ( 28 ) that is assigned to the yoke ( 27 ). 
     
     
         13 . The multiple displacement pump according to  claim 1 , wherein the lifting rod ( 14 ) is connected to an armature ( 26 ) of a pulling magnet ( 25 ), which armature can be moved back and forth between two yokes ( 27 ) that lie opposite one another and can be electromagnetically activated by means of alternately applying current to exciter coils ( 28 ) assigned to the yokes ( 27 ). 
     
     
         14 . The multiple displacement pump according to  claim 1 , wherein the connection element ( 13 ) is configured to be tubular and the lifting rod ( 14 ) is passed through the connection element ( 13 ), wherein the lifting rod ( 14 ) has stop elements ( 39 ,  40 ) on both sides, adjacent to the end faces of the connection element ( 13 ), with which elements the connection element ( 13 ) makes contact when a longitudinal displacement of the lifting rod ( 14 ) occurs. 
     
     
         15 . The multiple displacement pump according to  claim 14 , wherein at least one end-face stop element ( 39 ) of the lifting rod ( 14 ) is releasably connected to the lifting rod ( 14 ). 
     
     
         16 . The multiple displacement pump according to  claim 14 , wherein the tubular connection element ( 13 ) can be releasably closed off after removal of the lifting rod ( 14 ), at least in one position. 
     
     
         17 . The multiple displacement pump according to  claim 1 , wherein the propellant chambers ( 6 ,  9 ) of the fluid chambers ( 5 ,  8 ) are fluidically connected to one another. 
     
     
         18 . The multiple displacement pump according to  claim 17 , wherein a second, parallel displacer element ( 41 ) is assigned to the fluid chambers ( 5 ,  8 ), in each instance, with the formation of an interstice ( 30 ), wherein the interstice ( 30 ) is filled with a support fluid. 
     
     
         19 . A multiple displacement pump having a pump housing, which comprises a first outside lid ( 2 ) and a second outside lid ( 3 ) and at least one intermediate piece ( 4 ) accommodated between the lids ( 2 ,  3 ), wherein at least two fluid chambers ( 5 ,  8 ) are formed between the lids ( 2 ,  3 ) and the at least one intermediate piece ( 4 ), which interstices are divided, using at least one displacer element ( 11 ,  12 ), in each instance, into at least one propellant chamber ( 6 ,  9 ) and one media chamber ( 7 ,  10 ), and wherein the displacer elements ( 11 ,  12 ) of the at least two fluid chambers ( 5 ,  8 ) can be connected, by way of at least one connection element ( 13 ), with force fit and releasably, to at least one lifting rod ( 14 ), wherein the at least one lifting rod ( 14 ) can extend the at least one connection element ( 13 ) through a first passage ( 16 ) of the adjacent first lid ( 2 ),
 wherein the propellant chambers ( 6 ,  9 ) are connected to act together with a pneumatic drive, by way of pneumatic access openings ( 18 ) in the lids ( 2 ,  3 ), and the at least one connection element ( 13 ) can be extended, using the at least one lifting rod ( 14 ), in such a manner that the drive can be removed and a different drive can be attached to it, wherein specifically either a pneumatic or an electric drive can be adapted.   
     
     
         20 . The multiple displacement pump according to  claim 19 , wherein a first lid ( 2 ) has a first passage ( 16 ) for accommodating the lifting rod ( 14 ), wherein the first passage ( 16 ) is closed off in a propellant-sealed manner. 
     
     
         21 . The multiple displacement pump according to  claim 19 , wherein the first lid ( 2 ) is formed in one piece with a housing of the pneumatic drive. 
     
     
         22 . The multiple displacement pump according to  claim 19 , wherein a pressure translation unit ( 31 ) having a further fluid chamber ( 35 ) is assigned to the first lid ( 2 ) that is adjacent to the one connection means ( 15 ), wherein the connection element ( 13 ) is extended, using connection means ( 15 ), by means of a lifting rod ( 14 ), and the lifting rod ( 14 ) connects the connection element ( 13 ) to a further displacer element ( 32 ,  33 ) accommodated in the further fluid chamber ( 35 ), and wherein a first partial chamber ( 36 ) of the pressure translation unit ( 35 ) is fluidically connected to the first propellant chamber ( 6 ), and a second partial chamber ( 37 ) of the pressure translation unit ( 35 ) is fluidically connected to the second propellant chamber ( 9 ). 
     
     
         23 . The multiple displacement pump according to  claim 22 , wherein multiple parallel pressure translation units ( 35 ) are provided, the first partial chambers ( 36 ) of which are fluidically connected to the first propellant chamber ( 6 ), and the second partial chambers ( 37 ) of which are fluidically connected to the second propellant chamber ( 9 ). 
     
     
         24 . The multiple displacement pump according to  claim 22 , wherein the displacer element ( 32 ,  33 ) of the one or more pressure translation units ( 35 ) is a further membrane ( 32 ) or a further piston ( 33 ). 
     
     
         25 . The multiple displacement pump according to  claim 19 , wherein the connection element ( 13 ) is tubular and has a passage ( 42 ) for accommodating the lifting rod ( 14 ) in the direction of a longitudinal expanse. 
     
     
         26 . The multiple displacement pump according to  claim 25 , wherein the tubular connection element ( 13 ) has a releasable closure in at least one position. 
     
     
         27 . The multiple displacement pump according to  claim 1 , wherein the intermediate piece ( 4 ) has either a common suction line and a common pressure line, or two separate suction lines and two separate pressure lines for the media chambers ( 7 ,  10 ) of the fluid chambers ( 5 ,  8 ), which are adjacent to one another, in each instance, wherein the suction lines and the pressure lines are blocked off relative to the media chambers ( 7 ,  10 ), in each instance, using valves that lock in the same direction. 
     
     
         28 . The multiple displacement pump according to  claim 1 , wherein the intermediate piece ( 4 ) has a reach-through opening ( 38 ) through which the connection element ( 13 ), which connects multiple displacer elements ( 11 ,  12 ) to one another and to the at least one lifting rod ( 14 ), can be passed, wherein the reach-through opening ( 38 ) can be closed off in a media-sealed manner. 
     
     
         29 . The multiple displacement pump according to  claim 1 , wherein the intermediate piece ( 4 ) and/or the lids ( 2 ,  3 ) and/or the housing of the at least one mechanical actuator has/have a support foot that faces away from the intermediate piece ( 4 ), at least on one side.