Tightening device for a device for conveying fluid and a device for conveying fluid

Abstract

A tightening device for applying a preload to a fastening element, wherein the fastening element is suitable for fastening a diaphragm pump head part to a drive system for impressing movement on a diaphragm of the diaphragm pump head part in a device for conveying fluid. The tightening device has a support with support surface for supporting a bearing surface of the fastening element, wherein the support has a threaded bore through which a screw element penetrates. The screw element has a contact surface at its front end, wherein the contact surface of the screw element and the support surface of the support face opposite directions, and the distance between the contact surface of the screw element and the support surface of the support can be changed by screwing in or unscrewing the screw element.

1 . Tightening device for applying a preload to a fastening element, the fastening element being suitable for fastening a diaphragm pump head part ( 4 ) to a drive system ( 2 ) for impressing movement on a diaphragm of the diaphragm pump head part ( 4 ) in a device for conveying fluid, wherein the tightening device has a support ( 26 ) with a support surface for supporting a bearing surface of the fastening element, wherein the support ( 26 ) has a threaded hole through which a screw element ( 29 ) penetrates, and the screw element ( 29 ) has a contact surface at its front end ( 30 ), wherein the contact surface of the screw element ( 29 ) and the support surface of the support ( 26 ) face opposite directions, and the distance between the contact surface of the screw element ( 29 ) and the support surface of the support ( 26 ) can be changed by screwing in or unscrewing the screw element ( 29 ).