A diaphragm pump includes a pump body mechanism, a one-way valve mechanism, a diaphragm mechanism, and an eccentric mechanism, wherein the one-way valve mechanism, the diaphragm mechanism and the eccentric mechanism are mounted at the pump body mechanism. The one-way valve mechanism includes a valve cover and a one-way valve mounted at the pump body mechanism via the valve cover. The diaphragm mechanism includes a pump cover and a diaphragm connected to the pump cover. The pump cover is mounted at the pump body mechanism and covers the diaphragm and the valve cover. The diaphragm is detachably connected to the eccentric mechanism. The pump cover and the diaphragm jointly form a diaphragm cavity, and an inner side of the pump cover is provided with a flow channel communicating with the diaphragm cavity and configured to allow liquid to flow into or out of the diaphragm cavity through the flow channel.

A pump is configured to operate due to the bending of the pump. The pump can be used in a variety of applications including a dispensing application in which the pump is housed within a pouch. This type of pump takes advantage of the inherent flexible nature of the pouch.

A pump diaphragm for a diaphragm pump for conveying a fluid includes a solid core with a connection device for a drive rod of the diaphragm pump, and a plate-shaped elastic diaphragm body made of rubber having a peripheral clamping edge. The solid core is embedded at least partially in the diaphragm body and the solid core is produced from a thermoplastic and forms covalent bonds with the elastic diaphragm body made of rubber without adhesive. For this purpose, the thermoplastic, for example polyamide 612 or polyphenylene ether, and the rubber, a periodically cross-linked rubber such as EPDM, are selected in such a way that they are covalently cross-linked with one another at the boundary layer. In this way, a bonding layer that is susceptible to weakening or destruction is not present between the core and the diaphragm body.

Provided is a pumping system that includes a parallel dual chamber pumping mechanism and an attachable disposable cassette. The disposable cassette may include a multi-laminate membrane, which facilitates efficient, accurate and uniform delivery of fluids. The membrane can be held in intimate contact with the pumping fingers of the pumping mechanism by electrostatic or magnetic attraction, thereby allowing the pump to pull a vacuum without the need for a preloaded elastomeric pumping segment.

A reciprocating fluid pump includes a pump body, a subject fluid chamber, a first plunger located within the subject fluid chamber of the pump body and having a first head portion and a first bellows, the first plunger configured to expand and compress in a reciprocating action to pump the subject fluid through the subject fluid chamber within the pump body, wherein the first head portion and the first bellows have a first cross-sectional dimension, and a second plunger located within the subject fluid chamber of the pump body and having a second head portion and a second bellows, the second plunger configured to expand and compress in a reciprocating action to pump the subject fluid through the subject fluid chamber within the pump body, wherein the second head portion and the second bellows have a second cross-sectional dimension that is smaller than the first cross-sectional dimension.

A motor-less pump includes: (a) a housing having an inlet provided to allow fluid flow into the housing and an outlet provided to allow fluid flow out of the housing; (b) an elastic diaphragm positioned in the housing such that motion in the elastic diaphragm drives the fluid flows at the inlet and the outlet of the housing; and (c) one or more electromechanical polymer (EMP) actuators each being provided on a surface of the elastic diaphragm, wherein the mechanical responses to electrical stimuli applied on the EMP actuators cause the motion in the diaphragm. The EMP actuators may include one or more bimorphs.

A rotary pump comprising a housing (1) defining an annular chamber with inlet and outlet ports (12;11), a flexible annular diaphragm (3) forming one side of the chamber spaced opposite an annular wall of the housing (1), and a partition (13) extending across the chamber. The diaphragm (3) comprises an outer surface which engages the annular wall of the housing (1), and an inner surface opposite the first surface, wherein the outer surface is configured to be pressed progressively against the opposite wall of the housing (1), by a rotating means, to force fluid around the chamber. The rotary pump also comprises a reinforcement ring (4) surrounding the rotating means, and which comprises an embedded portion (30) embedded in an inner portion of a central region of the diaphragm (3), and a support portion (34) having a radially outwardly facing surface (35) which faces and supports the inner surface of the diaphragm (3) adjacent to the reinforcement ring (4) during operation of the rotary pump.

A control diaphragm for controlling fuel supply in a carburetor of an internal combustion engine includes a functional region enclosing a sensing region concentrically and a peripheral fastening border for fastening the control diaphragm in the diaphragm carburetor. The control diaphragm closes a control chamber of the diaphragm carburetor and is operatively connected via the central sensing region to a control lever in the control chamber and senses the axial deflection of the sensing region in a manner dependent on operation-induced pressure change in the control chamber. The control diaphragm consists in one piece of temperature-resistant and fuel-resistant, non-elastomeric plastic and the functional region is configured by way of a multiplicity of concentric corrugations. The outermost corrugation directly adjoins the fastening border, and the radius of the outermost corrugation corresponds substantially to the radius of the control chamber. The sensing region directly adjoins the innermost corrugation and the radius of the sensing region corresponds to from 5 to 25% of the outer radius of the functional region.

The invention relates to pump assemblies for pumping fluids with a high solids content. The present assembly comprises a housing having two parts with internal cylindrical chambers having openings for the inlet and outlet of a pumped fluid, and two longitudinally deformable bellows fastened inside the respective parts of the housing. The opposite end of each bellows is provided with a plug. On the end surface of the housing to which the bellows are connected is an opening for the inlet of a working fluid into the corresponding internal chamber. A hydraulic system for controlling the pump assembly is configured as a tank containing a working fluid, a positive displacement pump, two independent hydraulic pipelines, and a system of valves capable of alternately connecting the internal chambers of the bellows containing working fluid to the pipelines. The internal chamber of each bellows is alternatingly connected to the positive displacement pump for supplying working fluid by a first hydraulic pipeline and to the working fluid tank by a second hydraulic pipeline. The assembly allows to increase the capacity of the pump, reduce the weight and size of the pump assembly, and improve energy efficiency.

The present invention concerns a diaphragm unit (1) for a diaphragm pump comprising a diaphragm core (2) having a receiving means (3) for a thrust rod (4, 4, 4) of a pump drive, and a multi-layer pump diaphragm (5) connected to the diaphragm core (2), wherein the pump diaphragm (5) has a fluid-impermeable working diaphragm layer (6) which in operation of the diaphragm pump comes into contact with a fluid to be delivered by the diaphragm pump, and a fluid-impermeable safety diaphragm layer (7), a sealed volume (12) for receiving a fluid passing through the working diaphragm layer, that is arranged between the working diaphragm layer (6) and the safety diaphragm layer (7), and a first clamping region (9) with which the pump diaphragm (5) can be received in a receiving means of the diaphragm pump, wherein the first clamping region (9) forms a ring which annularly surrounds the diaphragm core (2). To provide a diaphragm unit for a diaphragm pump which in a simple fashion permits detection of a rupture of the working diaphragm layer, according to the invention it is proposed that provided within the ring formed by the first clamping region (9) is at least one element (13, 27, 25) of a sensor for detecting a fluid which penetrates into the sealed volume (12) of the pump diaphragm (5).