DE102010038225B4 - Tubular diaphragm process pump - Google Patents

Abstract

Hose diaphragm process pump with a housing (1), a hose membrane (2) arranged in the housing (1), which has a displacement space on the inside, at its two ends - the pump head (19) - non-return valves (3, 4) acting against the conveying direction and Shut-off valves (5) are arranged, the hose membrane forming an annular space (6) on the outside with the wall of the housing (1), which is filled with a supply liquid and is connected to a pressure space (7) to form a secondary hydraulic space (8), and wherein Actuating means for alternately sucking supply liquid from the annular space (6) into the pressure space (7) and pressing supply liquid out of the pressure space (7) m the annular space (6) are provided, characterized in that a reserve pump head (19d) is provided , means are provided for switching off the pump head and for activating the reserve pump head (19d).

Description

The invention relates to a tubular membrane process pump having a housing, a hose diaphragm arranged in the housing, the inside of which a displacement chamber at the two ends - the pump head - against the direction of flow acting check valves and shut-off valves are arranged, wherein the hose membrane on the outside with the wall of the housing forms an annular space which is filled with a reference liquid and is connected to a pressure chamber to form a secondary hydraulic space and wherein actuating means for alternately sucking the original liquid from the annulus in the pressure chamber and pressures of original liquid from the pressure chamber are provided in the annulus.

The DE 44 25 515 B4 describes a dual diaphragm pumping device having a pair of axially aligned diaphragms each reciprocable within a diaphragm chamber, the chamber having a fluid pumping section and an air section. In order to prevent the failure of the pump due to leaks due to the wear of valve actuators, it is proposed there that the actuating valve for the double diaphragm pump is self-sealing and constructed from a relatively small number of parts and thus accessible without complete disassembly of the pump for maintenance.

A hydraulically driven diaphragm pump is out of the DE 299 20 397 U1 known.

A tubular membrane process pump according to the preamble is in the EP 1 520 988 B1 described and marketed by Feluwa Pumpen GmbH under the name "MULTISAFE double-tube diaphragm process pump". In this pump, the rotation is converted by means of crank mechanism in a translational movement of the crosshead. The connected to the crosshead piston displaced by an oscillatory movement within a cylinder, a defined amount of hydraulic original liquid on the tube membrane.

In the meantime, these pumps have been developed so far that, in principle, only the delivery valves are considered to be a real wearing part and have to be replaced after 1,000 to 9,000 operating hours, depending on the operating pressure and the pumped medium. Although it is from Heinz M. nails, Hermetically sealed positive displacement pumps, 2010, ISBN 978-3-00-030685-3, pages 93 to 97 known to perform an automatic condition monitoring of the delivery valves based on the structure-borne noise analysis of the delivery valves, which already leaks can be detected at an early stage when the production loss is still less than 1.5%. This makes use of the effect that occurs with an incipient leakage in the delivery valves, a partial underrun of the vapor pressure of the pumped medium. This undesirable throttle point generates a flow cavitation with a corresponding sound spectrum, which is analyzed in the measuring system used and converted in the evaluation system into a usable measured variable. In a four-valve pump with eight valves or 16 valves, for example, then no longer all valves must be dismantled to determine the actually damaged. With the measuring system leaks can be detected at an early stage and repairs can be planned. In a continuous operation, however, it is necessary to supplement the pumps by a stand-by pump, which is associated with high acquisition costs.

From the DE 196 48 695 C2 An apparatus for automatic and continuous analysis of liquid samples by means of an array of micropumps is known. The micropumps are positioned on a silicon wafer having a thickness of about 500 microns. One of these micropumps covers an area of about 10 mm ² . The drive of the pumps is designed as a piezo bimorph system. The task of the dosing pumps is to convey reagents or sample liquids which are swirled after the pumps in a mixing chamber and then swirled chemically stable in the following reaction channel. The control of the micropumps for switching on and off is controlled by a differential pressure measurement from the resulting volume flow. However, the drive only serves to promote a certain amount of reagents to perform a safe analysis process after the swirling in the mixing chamber and the reaction channel.

The object of the invention is therefore to provide a hose-diaphragm process pump according to the preamble, with a continuous operation even without Vorhalten a stand-by pump is possible.

This object is achieved in that the pump has a reserve pump head, with means for switching off the pump head and to activate the reserve pump head are provided.

The pumps are thus provided with an additional pump head, which makes it possible to decide individually at which degree of wear of the delivery valves (for example, 2, 5 or 10%), the respective pump head is turned off and the reserve pump head is activated. The repair of Delivery valves - and if necessary, the repair of the hose diaphragm - can then be carried out during operation without a stand-by pump is needed.

It is provided in this context that the means for switching off or activating the pump head and reserve pump head are designed as a programmable controller.

By way of example, a degree of wear can be preset via this programmable controller, at which point the pump head is switched off and the reserve pump head is activated.

A preferred embodiment of the invention is that the actuating means are designed as a primary hydraulic system, wherein a movable separating piston between the Primärhydrauliksytem and the secondary hydraulic space is provided.

Instead of a mechanical drive, in which the rotation is converted by means of a crank mechanism into a translatory movement of the crosshead, the drive thus takes place via a primary hydraulics, which is coupled to the secondary hydraulics. The activation of the membranes is thus effected by means of a hydraulic unit via directional control valves, wherein the hydraulic unit activates a cylinder which moves the separating piston. The hydraulic drive in combination with the reserve pump head according to the invention makes it possible to carry out repairs during operation without the presence of a stand-by pump, which is not possible with mechanical drives.

A preferred embodiment of the invention is then that the cylinder is designed as a differential cylinder.

Finally, there is an advantageous embodiment of the invention is that the tube membrane is designed as a double-tube membrane, which is formed by two concentric with each other arranged individual tube membranes.

An embodiment of the invention will be explained in more detail with reference to drawings.

Show it

1 a sectional view of a double-tube membrane process pump according to the invention,

2 a circuit diagram of a double-tube membrane process pump according to the invention.

How out 1 it can be seen in the case of the double-tube membrane process pump according to the invention in a housing 1 a double-tube membrane 2 arranged. The double tube membrane 2 consists of two individual tube membranes, which are arranged concentrically to each other and end in the housing 1 are tightened. The inner tube membrane defines a displacement chamber or flow channel for the fluid to be delivered, at both ends - the pump head 19 ( 2 ) - against the direction of flow acting check valves 3 . 4 , which may be formed for example as ball valves, are arranged. In front of the input side check valve 3 is a shut-off valve 5 for the suction side of the fluid and after the output side check valve 4 a shut-off valve 5 arranged for the pressure side of the pumped medium.

The outer tube membrane forms with the wall of the housing 1 an annulus 6 , which is filled with a reference liquid as a hydraulic medium. The annulus 6 is above an opening in the wall of the housing 1 and a not shown closer connection line with the pressure chamber 7 in conjunction with the annulus 6 , the connecting pipe and the pressure chamber have a secondary hydraulic room 8th form.

To compensate for leakage losses of the original liquid, is a reservoir 9 provided with the secondary hydraulic room 8th connected via a leakage valve. Furthermore, a pressure relief valve is provided, via which at too high pressure in the secondary hydraulic space 8th Original liquid back into the storage tank 9 can get.

Furthermore, a primary hydraulic system is provided which is a hydraulic unit 10 that has a directional control valve 11 a cylinder 12 activated, which may be designed as a differential cylinder. This cylinder 12 activated via a second piston 13 which is in the secondary hydraulic room 8th is arranged, the secondary hydraulic, as described above, the pumping movement to the double-tube membrane 2 exercises. Furthermore, the primary hydraulic system comprises a tank 14 , a shut-off valve 15 , a pressure reducing valve 16 , a pressure relief valve 17 and bladder memory 18 ,

How out 2 can be seen, the activation of the double-tube membranes 2 via the hydraulic unit 10 and the directional valves 11 , which are designed here as 3/2-way valves.

At the in 2 shown Vierlingspumpe have three pump heads 19a . 19b and 19c open shut-off valves 5 on, so that the three pump heads 19a . 19b and 19c are alternately in working position while the reserve pump head 19d is locked. In this all shut-off valves 5 closed and the 3/2-way valve 11 is on the tank 14 connected. At this reserve pump head 19d Thus, during operation of the pump can repair one or both check valves 3 . 4 be made without the pump must be bridged by a stand-by pump altogether.

Claims (5)

Tubular membrane process pump with a housing ( 1 ), one in the housing ( 1 ) arranged tubular membrane ( 2 ), the inside a displacement space, at both ends - the pump head ( 19 ) - against the direction of flow acting check valves ( 3 . 4 ) and shut-off valves ( 5 ) are arranged, wherein the hose membrane on the outside with the wall of the housing ( 1 ) an annulus ( 6 ), which is filled with a reference liquid and with a pressure chamber ( 7 ) forming a secondary hydraulic room ( 8th ) and wherein actuation means for alternately sucking original liquid from the annulus ( 6 ) into the pressure chamber ( 7 ) and pressing of original liquid from the pressure chamber ( 7 ) in the annulus ( 6 ), characterized in that a reserve pump head ( 19d ), means for switching off the pump head and for activating the reserve pump head ( 19d ) are provided. Tubular membrane process pump according to claim 1, characterized in that the means for switching off or activating the pump head and reserve pump head ( 19d ) are designed as a programmable controller. Tubular membrane process pump according to claim 1 or claim 2, characterized in that the actuating means are designed as a primary hydraulic system, wherein a movable separating piston ( 13 ) between the primary hydraulic system and the secondary hydraulic room ( 8th ) is provided. Tubular membrane process pump according to claim 3, characterized in that the cylinder ( 12 ) of the primary hydraulic system is designed as a differential cylinder. Tubular membrane process pump according to one of claims 1 to 4, characterized in that the tubular membrane ( 2 ) as a double-tube membrane ( 2 ) is formed, which is formed by two concentrically arranged individual tube membranes.

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