Diaphragm fastening to the drive of metering pumps

1 . A metering pump comprising

(i) a diaphragm return device comprising tie rod ( 3 ) and

(ii) a diaphragm assembly comprising a mechanically driven elastic diaphragm ( 1 ) having a flexible region between the clamping surface, which serves to seal the delivery chamber, at the periphery of the diaphragm and a diaphragm core ( 2 ) which serves for force transmission, pressure generation and for connection to the tie rod,

wherein the diaphragm assembly and the tie rod are connected by a hook coupling, and

wherein

the diaphragm core ( 2 ) is provided, in the direction of the tie rod ( 3 ), with a cylindrical connection piece ( 4 ) which bears two oppositely positioned tabs ( 5 ) at the end,

the tie rod ( 3 ) is provided on the end side with an axial turned-out portion ( 6 ) for receiving the connection piece tabs ( 5 ), and

the tie rod ( 3 ) is equipped with a coupling sleeve ( 7 ) which has a radial transverse-groove opening ( 8 ), wherein the opening serves for the plugging therethrough, and then rotation, of the connection piece tabs.

2 . The metering pump according to claim 1 ,

wherein the coupling sleeve ( 7 ) and tie rod ( 3 ) consist of one piece.

3 . The metering pump according to claim 2 ,

wherein the coupling sleeve ( 7 ) and tie rod ( 3 ) consist of metal.

4 . The metering pump according to claim 2 ,

wherein the coupling sleeve ( 7 ) and tie rod ( 3 ) consist of plastic or the coupling sleeve consists of plastic and the tie rod consists of metal.

5 . The metering pump according to claim 1 , wherein the coupling sleeve ( 7 ) is connected to the tie rod ( 3 ) by flanging.

6 . The metering pump according to claim 1 ,

wherein the coupling sleeve ( 7 ) is screwed directly to the tie rod ( 3 ) via a thread ( 10 ).

7 . The metering pump according to claim 1 , wherein the coupling sleeve ( 7 ) is fastened to the tie rod ( 3 ) with screws ( 11 ).

8 . A metering pump comprising (i) a diaphragm return device comprising tie rod ( 3 ) and (ii) a diaphragm assembly comprising a mechanically driven elastic diaphragm ( 1 ) having a flexible region between the clamping surface, which serves to seal the delivery chamber, at the periphery of the diaphragm and a diaphragm core ( 2 ) which serves for force transmission, pressure generation and for connection to the tie rod,

wherein the diaphragm assembly and the tie rod are connected by means of a plug-in coupling, and

wherein

the diaphragm core ( 2 ) is provided, in the direction of the tie rod ( 3 ), with a cylindrical coupling member ( 12 ), wherein the coupling member has a groove ( 13 ),

the tie rod ( 3 ) is provided on the end side with a first-axial-opening ( 14 ) for receiving the coupling member ( 12 ), and

the tie rod has a second-radial-opening ( 15 ) which is used for the fixing of the coupling member ( 12 ).

9 . The metering pump according to claim 8 ,

wherein, for the fixing of the coupling member ( 12 ), a displaceable component ( 16 ) is arranged in the tie rod ( 3 ), said displaceable component engaging in a lock-like manner into the groove ( 13 ) of the coupling member ( 12 ) due to the pressure of a compression spring ( 17 ).

10 . The metering pump according to claim 8 ,

wherein, for the fixing of the coupling member ( 12 ), a clamp coupling ( 19 ) is arranged on the tie rod ( 3 ), said clamp coupling consisting of two clamp halves braced with a spring ( 20 ) and being mounted on two parallel transverse grooves ( 22 ) of the tie rod ( 3 ).

11 . The metering pump according to claim 8 ,

wherein, for the fixing of the coupling member ( 12 ), a resiliently mounted ball ( 24 ) is introduced into a radial transverse bore ( 23 ) of the tie rod ( 3 ) and the groove ( 13 ) in the coupling member is an obliquely running transverse groove of variable depth.

12 . The metering pump according to claim 11 ,

wherein the resiliently mounted ball ( 24 , 37 ) is a resilient pressure piece.

13 . The metering pump according to claim 11 ,

wherein the resiliently mounted ball ( 24 ) is screwed into a radial transverse bore ( 23 ) of the tie rod ( 3 ).

14 . The metering pump according to claim 8 ,

wherein

the diaphragm core ( 2 ) is provided, in the direction of the tie rod ( 3 ), with a cylindrical coupling member ( 12 ),

the tie rod ( 3 ) is provided on the end side with a first-axial-opening ( 14 ) for receiving the coupling member ( 12 ),

the tie rod has a transverse groove ( 25 ), and,

for the fixing of the coupling member, a resiliently mounted ball ( 24 ) is introduced into a radial transverse bore ( 23 ) of the coupling member.

15 . The metering pump according to claim 14 ,

wherein the resiliently mounted ball ( 24 ) is screwed into the radial transverse bore ( 23 ) of the coupling member.

16 . The metering pump according to claim 8 ,

wherein, for the fixing of the coupling member ( 12 ), a respective grub screw ( 27 ) is screwed into one or more radial transverse bores ( 26 ) of the tie rod ( 3 ) and the coupling member has a radially encircling groove ( 28 ) for receiving the screw tip.

17 . A metering pump comprising (i) a diaphragm return device comprising tie rod ( 3 ) and (ii) a diaphragm assembly comprising a mechanically driven elastic diaphragm ( 1 ) having a flexible region between the clamping surface, which serves to seal the delivery chamber, at the periphery of the diaphragm and a diaphragm core ( 2 ) which serves for force transmission, pressure generation and for connection to the tie rod,

wherein the diaphragm assembly and the tie rod are connected by means of a clamping connection, and

wherein the diaphragm core ( 2 ) is provided, in the direction of the tie rod ( 3 ), with a clamping connection piece ( 29 ) which is able to be screwed in, a clamping groove ( 35 ) is worked into the tie rod ( 3 ), and the end side of the tie rod ( 3 ) is provided with a clamping connection ( 30 ) which has a first clamping hub ( 31 ) and optionally a second clamping hub ( 32 ), wherein the first clamping hub ( 31 ) is worked into the tie rod ( 3 ) itself, and the optional second clamping hub ( 32 ) forms a separate part which is fastened by screw fastening.

18 . The metering pump according to claim 17 ,

wherein the clamping connection ( 30 ) has a radially displaceable second clamping hub ( 32 ), wherein the second clamping hub ( 32 ) is able to be fixed.

19 . The metering pump according to claim 17 ,

wherein the clamping connection ( 30 ) has an axially displaceable coupling sleeve ( 34 ) which, displaced in the direction of the diaphragm core ( 2 ), clamps the clamping connection piece ( 29 ) in the clamping groove ( 35 ) worked into the tie rod, a resiliently mounted ball ( 37 ) is introduced into a radial transverse bore ( 36 ) of the tie rod ( 3 ), and a corresponding depression ( 38 ) for receiving the ball ( 37 ) is located in the coupling sleeve.