EP4328448A2 - Membrane pump - Google Patents

Abstract

Diaphragm pump with at least one pump chamber, the pump chamber being connected to an inlet chamber via an inlet valve and to an outlet chamber via two outlet valves, the inlet valve having an inlet opening which can be closed by an inlet valve body and the outlet valve each having an outlet opening which can be closed by an outlet valve body, the two outlet valves and the inlet valve forms a triangle in a projection onto a projection plane transverse to the longitudinal axis of the pump chamber.

Description

The invention relates to a diaphragm pump with a pump chamber, the pump chamber being connected to an inlet chamber via an inlet valve and to an outlet chamber via an outlet valve. The invention also relates to a device for conveying fluids with a membrane pump.

Out of DE 101 17 531 A1 and from DE 20 2006 020 237 U1 Diaphragm pumps are known which have a pump head essentially connected to a drive. The pump head has several, for example four, pump chambers, each of which is sealed from a drive chamber by means of a pump membrane. The respective pump membrane is connected via an assigned pump element to a swash plate arranged in the drive chamber. A wobbling movement of the swash plate sets the pump membrane into a wobbling, axially periodic pumping movement. The swashplate sits on a drive pin of a drive shaft connected to the drive. The drive pin is inclined relative to the longitudinal axis of the drive shaft and is connected to the swashplate via a ball bearing. For the diaphragm pumps DE 101 17 531 A1 and DE 20 2006 020 237 U1 an outlet chamber is arranged centrally and an inlet chamber is arranged concentrically to the outlet chamber around the outlet chamber.

Out of EP 3 327 287 A1 a membrane pump with at least one pump chamber is known. The pump chamber is connected to an inlet chamber via an inlet valve and to an outlet chamber via an outlet valve, the inlet valve having an inlet opening which can be closed by an inlet valve body and the outlet valve having an outlet opening which can be closed by an outlet valve body. The outlet opening surrounds the inlet opening or the inlet opening surrounds the outlet opening.

Diaphragm pumps are used in particular in areas of chemistry, pharmacy and biotechnology in which the pumped medium is sometimes very expensive, so it is desirable that after the pumping process, if possible, no or only a small residual volume of the pumped medium remains in the diaphragm pump. Furthermore, completely filling such diaphragm pumps with the fluid without air inclusions is advantageous for the delivery performance.

Disadvantageous for those from DE 101 17 531 A1 and DE 20 2006 020 237 U1 Known diaphragm pumps that have basically proven themselves is that they have a central inlet chamber, which essentially means that In the external outlet chamber arranged concentrically to the inlet chamber, a relatively large residual volume of the pumped medium remains in the inlet chamber after the pumping process has ended. Furthermore, air usually remains in the upper pump chambers of the pump, which usually has a negative effect on the delivery stability (pulsation) as well as the pump performance. Disadvantageous to the from EP 3 327 287 A1 known diaphragm pump, which has also proven itself in principle, is that the provision of an outlet opening that surrounds the inlet opening or the provision of an inlet opening that surrounds the outlet opening places relatively high demands on the design of the diaphragm pump, in particular on the design of individual inlet chambers, which are connected to an inlet valve.

The object of the present invention is therefore to improve the known membrane pumps with regard to the residual emptying and/or venting of the pump chambers, with a simple structure and/or a simple design being sought.

This task is solved by the subject matter of the independent patent claims. Advantageous embodiments are set out in the subclaims and the description below.

The invention is based on the basic idea of choosing the positioning of two outlet valves in the pump chamber and one inlet valve in the pump chamber more effectively in order to improve the residual emptying and/or venting of the pump chamber, but also to make the structure simpler. The invention has recognized for the first time that the provision of two exhaust valves, which are provided in addition to the inlet valve, can lead to a simpler structure if the two exhaust valves and the inlet valve are arranged in the corners of an arbitrary triangle. It was previously assumed that a direct spatial relationship between outlet openings and inlet openings was necessary, for example in that the inlet opening should be surrounded by the outlet opening. The invention has, among other things, broken the prejudice that an offset arrangement of the outlet valves relative to the inlet valve does not enable an improvement of the diaphragm pump. Instead of an arrangement of the inlet/outlet openings, the invention is primarily based on an essentially special arrangement of inlet valve and two outlet valves of a pump chamber, by means of which the remaining amount of medium pumped and also the air remaining in the pump chamber can be reduced after the pumping process has ended and even complete emptying is possible. One of the outlet valves can be related to the direction of gravitational acceleration in the upper area of the pump chamber and that other outlet valves can be arranged in the lower area of the pump chamber in relation to the direction of gravitational acceleration. The inlet valve is arranged offset from the outlet valves of a respective pump chamber, so that an advantageous placement of the outlet valves can be achieved. For example, the inlet valve can be arranged next to or to the side of the lower of the two outlet valves. In addition to the possibility that the diaphragm pump empties and/or vents itself to a large extent automatically, an improved flow distribution can be made possible with a simpler structure of the diaphragm pump.

According to a first aspect of the invention, the diaphragm pump has at least one pump chamber, the pump chamber being connected to an inlet chamber via an inlet valve and to an outlet chamber via two outlet valves. The inlet valve has an inlet opening that can be closed by an inlet valve body. Each outlet valve has an outlet opening that can be closed by an outlet valve body. Two outlet valves are provided for the pump chamber and the two outlet valves and the inlet valve form a triangle in a projection onto a projection plane transverse to the longitudinal axis of the pump chamber. The offset arrangement of the inlet valve and the two outlet valves enables optimal placement of the pump chamber. In particular, an outlet valve can be arranged in the lower region and another outlet valve in the upper region of the pump chamber, regardless of the arrangement of the inlet valve in the pump chamber. The inlet valve can be arranged in the lower region of the pump chamber. The inlet valve can be arranged closer to a central axis of the diaphragm pump than the outlet valves. The arrangement of the two outlet valves and the inlet valve enables a simple construction of the diaphragm pump. By arranging the two outlet valves with the inlet valve to form a triangle, it is possible for projections of a straight line connecting each of the two outlet valves to the inlet valve of the pump chamber on a projection plane transverse to the longitudinal axis, the projection plane having a point in common with the longitudinal axis. to be able to have an angle not equal to 0 degrees to each other.

For the purposes of the description, the term "central axis" or "central axis" of the diaphragm pump includes an axis that extends essentially transversely to the front panel, to the valve plate and / or to the end plate (the central axis or central axis can be essentially parallel to the normal of the Front plate, the valve plate and / or end plate extend) and can be arranged essentially centrally to one of the plates. In a preferred embodiment, the central axis or central axis can run centrally through an inlet, which is arranged in particular centrally, in particular in a front panel.

For the purposes of the description, the term “longitudinal axis” of the pump chamber includes an axis which runs in particular transversely to the valve plate (essentially parallel to the normal of the valve plate). The longitudinal axis is arranged essentially centrally to the pump chamber, in particular essentially centrally to the pump membrane. The longitudinal axis of the pump chamber runs essentially parallel to the central axis or central axis of the membrane pump.

In a second aspect of the invention, the diaphragm pump has at least one pump chamber, the pump chamber being connected to an inlet chamber via an inlet valve and to an outlet chamber via two outlet valves. The inlet valve has an inlet opening that can be closed by an inlet valve body and each outlet valve has an outlet opening that can be closed by an outlet valve body. Two outlet valves are provided for the pump chamber. A projection of straight connecting lines, each of which connects adjacent outlet valves, onto a projection plane transverse to the longitudinal axis of the pump chamber is free of intersections with inlet valves. It is possible that, although two outlet valves are provided per pump chamber, the outlet valves are arranged in relation to the inlet valve in such a way that an arrangement of the outlet valves in relation to the inlet valve results, which, in addition to the desired residual emptying, the venting of the pump chamber and the delivery stability as well as the pump performance, is simple Structure with regard to the inlet chamber or outlet chamber fluidly connected to the inlet valves and the outlet valves can be achieved by combining the inlet valves in a common inlet chamber and / or the outlet valves in a common outlet chamber.

In a third aspect of the invention, the diaphragm pump has at least two pump chambers, each pump chamber being connected to a respective inlet chamber via a respective inlet valve and to an outlet chamber via two outlet valves. Each inlet valve has an inlet opening that can be closed by a respective inlet valve body and each outlet valve has an outlet opening that can be closed by a respective outlet valve body. The inlet valves are arranged in a common inlet chamber. In this way, the design and/or construction can be simplified; in particular, in the case of modular diaphragm pumps, an attempt can be made to use a plate that has previously been used for diaphragm pumps. It can be achieved that an improvement in terms of residual emptying, venting and/or pulsation is achieved only by changing the arrangement of the outlet and/or inlet valves of the pump chamber, without the plates forming the inlet chamber and/or outlet chamber having to be changed. In addition, expenses for sealing the one inlet chamber compared to the provision can be made several inlet chambers can be reduced. In a particularly preferred embodiment, the inlet chamber can be provided essentially centrally.

The aforementioned aspects of the invention can be freely combined with one another and further improvements can result.

The membrane pump has a pump chamber, preferably two and particularly preferably three, four or more pump chambers. This pump chamber or the plurality of pump chambers can particularly preferably be changed in volume cyclically, in particular periodically, by an external force. Particularly preferably, at least one wall of the chamber volume is formed by a membrane, which is preferably made of one or more elastic material or materials, for example plastic, rubber, elastomer, silicone or an equivalent material, which in particular also includes one or more composite materials for increased stability and lifespan can include. If the wall formed by the membrane is designed in such a way that it can completely squeeze out the space intended to form the pump chamber, the pump chamber can be dimensioned with regard to the maximum volume of the pump chamber to be kept in such a way that this maximum volume corresponds exactly to that within a pump stroke as planned conveying fluid volume corresponds. However, (significantly) larger pump chambers are also conceivable, which can, for example, improve the flow behavior, the efficiency of the membrane pump or the production costs.

A valve body in the context of the description can in particular be formed by an elastic membrane, which generally at least partially opens the valve opening assigned to the valve body when there is a suitable pressure difference. Metals, for example, are also possible as materials for the valve body, but in particular also plastic, rubber, elastomer, silicone or an equivalent material, which in particular can also have or be formed from one or more composite materials. If there is a pressure difference in the opposite direction, the valve body closes the valve opening and/or a spring element is provided which acts on the valve body and biases it into the closed position when it is outside the closed position in which the valve body closes the valve opening. A membrane is here understood to mean, in particular, a plate which mostly has elastic and/or resilient properties, whereby these elastic and/or resilient properties can also only be present in sections, for example in the edge region. The membrane can be flat in sections, but in a preferred embodiment it is curved in the sections in which it seals a pump chamber, with curved section can be adapted to the stroke. Furthermore, a valve control can control the opening and closing of the valves or influence the optimization of the pumping process.

Particularly preferably, the inlet valve and/or the outlet valve is a shield valve. An umbrella valve is a valve in which the valve body is formed by an umbrella.

In the context of the description, the mention of a number includes the provision of exactly the number of elements designated by the number, although other identical or similar elements are not excluded. If, for example, the description describes that a pump chamber has two outlet valves, the pump chamber can have exactly two, but also three, four or more outlet valves. The same applies to the inlet valve. A pump chamber can have exactly one inlet valve, two, but also three, four or more inlet valves. It is possible that pump chambers have a different number of inlet and/or outlet valves.

An inlet chamber within the scope of the description functions to hold the fluid to be pumped. The inlet opening can be formed directly in a wall of the inlet chamber. This makes a compact design of the membrane pump possible, especially if, in a further preferred embodiment, the inlet opening opens directly into the pump chamber. It is possible for an inlet channel to be provided between the inlet chamber and the pump chamber, which connects the inlet chamber to the pump chamber. This creates the possibility of making the position of the inlet chamber within the diaphragm pump relative to the pump chamber more freely. In a particularly preferred embodiment, the inlet chamber is connected to the pump chamber directly via the inlet opening without the interposition of an inlet channel, so that an additional design of an inlet channel can be omitted.

An outlet chamber in the context of the description serves to collect and bundle the pumped fluid, in particular for forwarding it to a central outlet of the diaphragm pump, in particular in the case of several pump chambers and/or outlet valves. The outlet opening can be formed directly in a wall of the outlet chamber. This makes a compact design of the diaphragm pump possible, especially if, in a further preferred embodiment, the outlet opening opens directly into the pump chamber. It is possible for an outlet channel to be provided between the outlet chamber and the pump chamber, which connects the outlet chamber to the pump chamber. This creates the possibility of changing the location of the outlet chamber within the To make the diaphragm pump freer relative to the pump chamber. In a particularly preferred embodiment, the outlet chamber is connected to the pump chamber directly via the outlet opening without the interposition of an outlet channel, which can simplify the construction of the membrane pump.

In a preferred embodiment, an outlet valve is arranged in an edge region of the pump chamber and an outlet valve in the opposite edge region of the pump chamber. This allows the outlet valves to be positioned effectively to achieve improved residual fluid drainage and ventilation. One of the edge areas can be an “upper area” of the pumping chamber and the other of the edge areas can be a “lower area” of the pumping chamber. In the context of the description, the terms "upper region" and "lower region" include two regions of the pump chamber which are present in opposite edge regions of the pump chamber. The term “upper region” includes the placement of the outlet valve functionally such that at least one outlet opening is provided, which is arranged as close as possible to the upper edge of the pump chamber. The direction "top" or "upper" refers to the direction of gravitational acceleration when the diaphragm pump is installed and in the operating position. The direction specification "upper" area describes an edge area of the pump chamber that is further apart from the "lower area" in the direction of gravitational acceleration. The arrangement of the outlet valves in the upper and lower region includes positioning such that one or more outlet openings assigned to the outlet valve are arranged in the upper or lower edge region of the pump chamber.

In a preferred embodiment, the inlet valve is arranged closer to the central axis of the diaphragm pump than the two outlet valves. As a result, the inlet chamber can be arranged centrally and surrounded by the outlet chamber, which means that the outlet chamber can be arranged below the inlet chamber in relation to the direction of gravitational acceleration, whereby the residual emptying of the entire diaphragm pump can be further improved.

In a preferred embodiment, two outlet valves offset from one another with respect to a vertical are provided for the pump chamber. In this way, variability in the arrangement of the outlet valve and inlet valve can be achieved, which, in addition to having a beneficial effect on residual emptying, venting, and delivery stability, also has an effect on the pump performance, but also leads to a simpler design of the diaphragm pump. In the context of the invention, a vertical describes a line that runs transversely to the central axis of the diaphragm pump or transversely to the longitudinal axis of the pump chamber; in particular, the vertical can be parallel to the Axis of gravitational acceleration, whereby the diaphragm pump is viewed in the installed and operational state.

In a preferred embodiment, the inlet valve of the pump chamber is arranged off-center in the cross section of the pump chamber. This makes it possible to offset the inlet valve, which can create the most free choice possible in the arrangement of the two outlet valves. Essentially, the inlet valve can be moved into an area of the pump chamber so that the outlet valves can be positioned in an improved manner and at the same time a connection of the pump chamber by means of the outlet valves and the inlet valve to the inlet chamber and the outlet chamber is also improved. In the sense of the description, the term “off-center” includes a position indication that essentially corresponds to the center of the cross-section and/or the center of gravity of the cross-section, being viewed along the longitudinal axis of the diaphragm pump, in this respect it is described that the inlet valve is not lies on an axis through the center of the cross section or on an axis through the center of gravity of the cross section.

In a preferred embodiment, the outlet valves are arranged in a circle or in the shape of a segment of a circle. The outlet valves can be arranged essentially circularly or in the shape of a segment of a circle on a valve plate, which simplifies the production of the diaphragm pump. In a particularly preferred embodiment, the outlet valves are arranged in a circle or in the shape of a segment of a circle around a central axis of the diaphragm pump. The circular or circular segment-shaped arrangement of the outlet valves can lead to a reduced effort to form an outlet chamber. Due to a circular (segment)-shaped design, the outlet chamber can have rotation invariance.

In a preferred embodiment, the diaphragm pump has more than one pump chamber, the arrangement of the inlet valve and the two outlet valves of the pump chambers essentially having rotation invariance with respect to an angle of less than 360° about the central axis of the diaphragm pump. If several pump chambers are used, rotation invariance can be created, which, in addition to a simple structure or construction, enables easy handling or simple assembly of the membrane pump. For example, it can be provided that a rotation invariance of 360°/number of pump chambers can be achieved.

In a preferred embodiment, an outlet chamber is provided which is annular. This can create the possibility of a To construct a simply constructed diaphragm pump, in particular the outlet chamber can surround the inlet chamber and the sealing of the outlet chamber can be limited to, if possible, only one chamber. In particular, with two or more pump chambers, a common outlet chamber and a common inlet chamber can be provided, with the outlet chamber surrounding the inlet chamber and no area of the outlet chamber being arranged between two inlet chambers. The shape of the outlet chamber and/or inlet chamber may be a simple shape.

In a preferred embodiment, the cross section of the pump chamber has at least one straight section on a side wall. This makes it possible to enlarge the pump chamber compared to a completely curved side wall. A completely curved side wall in the upper or lower area provides immediate positioning arrangements for the outlet valves by positioning one inlet valve at the highest point and the other outlet valve at the lowest point of the pump chamber; This is where the air catches or the fluid flows, but venting or residual emptying can also be achieved in straight sections. Despite the imposing shape of a completely curved side wall, it was recognized that with the offset arrangement an enlargement of the pump chamber can also be achieved by providing straight sections of the side wall, in particular in the upper and / or lower area.

In a preferred embodiment, several pump chambers are provided and the pump chambers are arranged in a grid of columns and rows. The pump chambers can also be designed at different levels. Due to the grid-shaped arrangement of the pump chambers essentially above and below one another, an arrangement can be created in which the inlet valve can be offset from a central area in order to be able to effectively position the two outlet valves.

The invention also provides a device for conveying fluids with a membrane pump described in the description and/or the claims, wherein a pump head with a drive chamber and a drive is provided and the pump chamber is sealed from the drive chamber by means of a pump membrane. If two or more pump chambers are provided, the pump chambers can each be sealed from the drive chamber by means of a pump membrane. In a preferred embodiment, the pump membrane can be set into a periodic axial pumping movement via an assigned pump element.

In the context of the present description, the term “exhaust opening” not only describes a single opening, but is also used to represent a sum of Individual openings are used that are separated from each other. According to a preferred embodiment, the outlet opening is segmented into a plurality of opening sections, which are spaced apart from one another with respect to the projection plane transversely to the longitudinal axis of the pump chamber. The outlet opening sections of an exhaust valve can preferably be circular or in the shape of a segment of a circle. In a preferred embodiment, the outlet opening sections belong to an outlet valve in that the outlet opening sections are closed by a common valve body. The outlet opening or the outlet opening sections can extend in a direction such that the extent of the outlet opening or the area in which the outlet opening sections of an outlet valve are present essentially corresponds to 1/5 to 1/3 of the width and / or height of the pump chamber . This allows a high pump throughput to be achieved.

In the context of the description, the term “inlet opening” does not only encompass a single opening, but the inlet opening can be formed by inlet opening sections that are delimited from one another. According to a preferred embodiment, the inlet opening is segmented into a plurality of inlet opening sections, which are spaced apart from one another with respect to the projection plane transversely to the longitudinal axis of the pump chamber. The inlet opening sections can preferably be arranged in a circular or circular segment shape in a projection plane transverse to the longitudinal axis of the pump chamber. In a preferred embodiment, the inlet opening sections belong to an inlet valve in that the inlet opening sections are closed by a common valve body.

According to a preferred embodiment, the inlet chamber has a wall at its lower end in the vertical direction, which is designed such that the wall is essentially flush with the lower part of the inlet opening of at least one inlet valve. In particular, one or more lowest-lying inlet valves merge with their respective lower region of their respective inlet opening into the wall of the inlet chamber in such a way that the inlet chamber can empty completely via the inlet valves and remaining fluid is conveyed from the inlet into the outlet chamber during the pumping process.

According to a preferred embodiment, the outlet chamber has a wall on its lower region in the vertical direction, which is designed such that the wall is essentially flush with the lower part of the outlet opening of at least one outlet valve. In particular, one or more lowest-lying outlet valves merge into the wall of the outlet chamber with their respective lower region of their respective outlet opening in such a way that the The outlet chamber can be completely emptied via the outlet valves and the remaining fluid is pumped out of the diaphragm pump by the outlet chamber during the pumping process.

In a preferred embodiment, several, in particular all, outlet valves of the diaphragm pump are designed in the same way and particularly preferably have the same shape of outlet opening and/or the same shape of the valve body. In a preferred embodiment, several, in particular all, inlet valves of the diaphragm pump are designed to be similar to one another and particularly preferably have the same shape of the inlet opening and/or the same shape of the valve body.

In a preferred embodiment, an inlet valve plate is provided in or on which the inlet valves are arranged spatially separated. In a particularly preferred embodiment, the membrane pump has four pump chambers. In a preferred embodiment, the inlet valve plate has four spatially separated inlet valves. In a particularly preferred embodiment, the inlet valve plate has four spatially separated inlet valves that are arranged in a ring.

In a preferred embodiment, an outlet valve plate is provided in or on which the outlet valves are arranged spatially separated. In a preferred embodiment, the membrane pump has four pump chambers. In a preferred embodiment, the outlet valve plate has eight spatially separated outlet valves. In a particularly preferred embodiment, the outlet valve plate has eight spatially separated outlet valves that are arranged in a ring.

In a particularly preferred embodiment, a valve plate is provided in or on which both the inlet valves and the outlet valves are designed.

According to a preferred embodiment, a front plate, also referred to as a pump housing, and a valve plate are provided. The valve plate can be arranged between the front plate on one side and a membrane support part carrying the pump membrane, for example a membrane housing cover, on the other side. The inlet chamber(s) can be at least partially formed in the front panel. By abutting the front panel and the valve plate, the inlet chamber(s) is/are formed by recesses formed in the front panel being covered on the back by the valve plate. The outlet chamber can be at least partially formed in the front panel. Through the installation of the front panel and valve plate The outlet chamber or the outlet chambers are formed by covering recesses formed in the front panel on the back of the valve plate. The inlet valve or the inlet valves and the outlet valves can be arranged on the valve plate. The pump chamber or pump chambers can be at least partially formed in the valve plate. For simple and cost-effective production, the valve plate can be essentially flat. An edge-side profiling, in particular to interact with a corresponding profiling on the front panel, can be provided.

Fig. 1

eine Vorderansicht auf einen Pumpenkopf einer erfindungsgemäßen Membranpumpe (ohne Antrieb);

Fiq. 2

eine geschnittene Seitenansicht entlang der Linie A-A der Fig. 1;

Fig. 3

eine Rückansicht auf eine Ventilplatte der Membranpumpe;

Fig. 4

eine Rückansicht auf eine entlang der Linie A-A in der Fig. 4 geschnittene Ventilplatte ; und

Fig. 5

eine Vorrichtung zum Fördern eines Fluids.

The invention is explained in more detail below with reference to drawings showing two exemplary embodiments of the invention. Show in it:

Fig. 1

a front view of a pump head of a membrane pump according to the invention (without drive);

Fiq. 2

a sectioned side view along line AA of the Fig. 1 ;

Fig. 3

a rear view of a valve plate of the diaphragm pump;

Fig. 4

a rear view of one along line AA in the Fig. 4 cut valve plate ; and

Fig. 5

a device for conveying a fluid.

Fig. 1 shows the pump head 2 of a membrane pump 1. The membrane pump 1 forms part of a device for conveying a fluid.

Again Fig. 2 As can be seen, the pump head 2 has a front plate 3, which can also be referred to as a chamber housing, a valve plate 4 and an end plate 5, which can also be referred to as a membrane carrier, with pump membranes 6, which have pump elements with an in Fig. 2 swashplate, not shown, are connected.

On the front panel 3 there is a central inlet 7 in this embodiment, which opens into a central inlet chamber 8. An outlet 9 is provided on the front panel 3, which is connected to an outlet chamber 10 surrounding the inlet chamber 8, which is annular in this embodiment.

The valve plate 4 is arranged between the front plate 3 and the end plate 5. The valve plate 4 has four pump chambers 12 on its rear side 11 facing the end plate 5. The pump chambers 12, which are open towards the end plate 5, are each closed or limited by a pump membrane 6. The pump membranes 6 are arranged between the end plate 5 and the valve plate 4. A ring-shaped bead 13 of the pump membrane 6 in this embodiment is arranged in a groove 14 of the valve plate 4 arranged around the pump chamber 12.

The valve plate 4 closes the inlet chamber 8 of the front panel 3 and the outlet chamber 10 of the front panel 3. The valve plate 4 has four inlet valves 15, which are designed as umbrella valves. The inlet chamber 8 is connected to the pump chamber 12 via an inlet opening 16 assigned to the inlet valve 15. The inlet opening 16 is segmented and has a plurality of inlet opening sections 16a.

The valve plate 4 seals the annular outlet chamber 10 of the front panel 3. The valve plate 4 is essentially flat and has eight outlet valves 17 corresponding to the outlet chamber 10, which are also designed as umbrella valves. The outlet opening 18 of the exhaust valve 17 is formed by outlet opening sections 19.

An inlet valve 15 is provided for each pump chamber 12. Each pump chamber 12 has two outlet valves 17.

The two outlet valves 17 and the inlet valve 15 form a triangle in a projection onto a projection plane transverse to the longitudinal axis L of the pump chamber 12, which runs essentially parallel to a central axis M of the diaphragm pump 1, as shown in Fig. 3 is shown.

The Fig. 3 It can also be seen that adjacent outlet valves 17 on the valve plate 4 can be connected with straight connecting lines and a projection of these onto a projection plane transverse to the longitudinal axis L of the pump chamber 12 has no intersection with the inlet valves 15.

The two outlet valves 17 of a pump chamber are arranged in opposite edge regions of the pump chamber 12. One of the two outlet valves 17 is arranged in an upper region of the pump chamber 12, while the other of the two outlet valves 17 is arranged in a lower region of the pump chamber 12. The pump chamber 12 can be vented using the upper of the two outlet valves 17. Residual emptying is possible using the lower of the two outlet valves 17. The inlet valve 15 of a pump chamber 12 is laterally offset from one of the two outlet valves 17. The inlet valves 15 are arranged closer to the central axis M of the diaphragm pump 1 than the outlet valves 17 of the pump chambers 12.

The two outlet valves 17 of a pump chamber 12 are arranged offset from one another with respect to a vertical that runs essentially along the section AA or parallel to it. The inlet valve 15 is arranged off-center with respect to the cross section of the pump chamber 12.

The outlet valves 17 of the membrane pump 1 are arranged in a circle around the central axis M of the membrane pump 1.

With regard to the valve plate 4, there is a rotation invariance of 90° about the central axis M of the membrane pump 1. Again Fig. 3 can also be seen, the four pump chambers 12 are arranged in a grid of columns and rows, with the pump chambers 12 being arranged one above and next to one another.

The Fig. 4 is a opposite of the Fig. 3 Differently designed cross section of the pump chambers 12 for a further exemplary embodiment of the diaphragm pump 1 can be seen. Except for the cross section of the pump chambers 12, the embodiments are otherwise the same and correspond to one another, so that there is no need for repetition here. The cross section of the pump chamber 12 in Fig. 4 The illustrated embodiment has straight sections 20 on the side wall of the pump chamber 12, which has an intersection with the vertical and / or horizontal of a cross section of the pump chamber 12.

In the Fig. 5 Swashplate 21 shown is connected to a pin 23 of a drive shaft 24 via a ball bearing 22. The pin 23 is inclined relative to the longitudinal axis 25 of the drive shaft 24 in order to produce a tumbling movement of the swash plate 21. The connection between the drive axle and the swash plate 21 is arranged in the area of a drive chamber 26 in front of the end plate 5. The inlet chamber 8 is sealed from the outlet chamber 10 by a seal 27, which in the example is designed as a cord ring seal. The outer boundary of the outlet chamber 10 is sealed by a seal 28, which in the example is also designed as a cord ring seal.

By rotating the drive shaft 24 about its longitudinal axis 25, the swashplate 21 is set into a rotating wobbling movement due to the inclination of the pin 23 without rotating with the drive shaft 24. Due to the wobbling movement of the swash plate 21, the pump membranes 6 are set into a periodic axial pumping movement, through which negative pressure is generated in the pump chambers 12 alternately in the suction cycle by the movement in the direction of the drive chamber 26 and in the discharge cycle by a movement in the direction of the front panel 3 overpressure.

Due to the downstream arrangement of the valve shield of the inlet valve 15, the inlet valve 15 opens and the corresponding outlet valve 17 closes automatically when there is negative pressure in the associated pump chamber 12. If there is excess pressure in the pump chamber 12, the associated inlet valve 15 closes and the corresponding outlet valve 17 opens automatically. As a result, the pump medium is conveyed out of the pump chamber 12 through the outlet chamber 10 to the outlet 9.

Examples of embodiments

1. 1. Membranpumpe (1) mit mindestens einer Pumpkammer (12), wobei die Pumpkammer (12) über ein Einlassventil (15) mit einer Einlasskammer (8) und über zwei Auslassventile (17) mit einer Auslasskammer (10) verbunden ist, wobei das Einlassventil (15) eine durch einen Einlassventilkörper verschließbare Einlassöffnung (16) und jedes Auslassventil (17) eine durch einen jeweiligen Auslassventilkörper verschließbare Auslassöffnung (18) aufweist, wobei die zwei Auslassventile (17) und das Einlassventil (15) in einer Projektion auf eine Projektionsebene quer zur Längsachse (L) der Pumpkammer (12) ein Dreieck bilden.
2. 2. Membranpumpe (1), insbesondere nach Ausführungsbeispiel 1, mit mindestens einer Pumpkammer (12), wobei die Pumpkammer (12) über ein Einlassventil (15) mit einer Einlasskammer (8) und über zwei Auslassventile (17) mit einer Auslasskammer (10) verbunden ist, wobei das Einlassventil (15) eine durch einen Einlassventilkörper verschließbare Einlassöffnung (16) und jedes Auslassventil (17) eine durch einen jeweiligen Auslassventilkörper verschließbare Auslassöffnung (18) aufweist, wobei eine Projektion von geraden Verbindungslinien, die benachbarte Auslassventile (17) verbinden, auf eine Projektionsebene quer zur Längsachse (L) der Pumpkammer (12) schnittpunktfrei mit Einlassventilen (15) ist.
3. 3. Membranpumpe (1), insbesondere nach Ausführungsbeispielen 1 oder 2, mit zwei Pumpkammern (12), wobei die Pumpkammern (12) jeweils über ein Einlassventil (15) mit einer gemeinsamen Einlasskammer (8) und jeweils über zwei Auslassventile (17) mit einer Auslasskammer (10) verbunden sind, wobei das Einlassventil (15) eine durch einen Einlassventilkörper verschließbare Einlassöffnung (16) und jedes Auslassventil (17) eine durch einen jeweiligen Auslassventilkörper verschließbare Auslassöffnung (18) aufweist.
4. 4. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 3, wobei ein Auslassventil (17) in einem Randbereich der Pumpkammer (12) und ein Auslassventil (17) im entgegengesetzten Randbereich der Pumpkammer (12) angeordnet sind.
5. 5. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 4, wobei das Einlassventil (15) näher zur Mittelachse (M) der Membranpumpe (1) angeordnet ist als die beiden Auslassventile (17).
6. 6. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 5, wobei die beiden für die Pumpkammer (12) vorgesehenen Auslassventile (17) bezüglich einer Vertikalen zueinander versetzt angeordnet sind.
7. 7. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 6, wobei die Einlasskammer (8) und Auslasskammer (10) zumindest teilweise in einer Frontplatte (3) ausgebildet sind.
8. 8. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 7, wobei die Pumpkammer (12) ein Einlassventil (15) aufweist, das außermittig im Querschnitt der Pumpkammer (12) angeordnet ist.
9. 9. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 8, wobei die Auslassventile (17) kreisförmig bzw. kreissegmentförmig angeordnet sind.
10. 10. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 9, wobei mehr als eine Pumpkammer (12) vorgesehen ist, und die Anordnung des jeweiligen Einlassventils (15) und der jeweiligen beiden Auslassventile (17) der jeweiligen Pumpkammern (12) im Wesentlichen eine Rotationsinvarianz bezüglich eines Winkel unter 360° um die Mittelachse (M) aufweist.
11. 11. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 10, wobei eine Auslasskammer (10) ringförmig ausgestaltet ist.
12. 12. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 11, wobei der Querschnitt der Pumpkammer (12) mindestens einen im Wesentlichen geraden Abschnitt an einer Seitenwandung aufweist.
13. 13. Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 12, wobei mehrere Pumpkammern (12) vorgesehen sind, die in einem Raster aus Spalten und Zeilen angeordnet sind.
14. 14. Vorrichtung zum Fördern von Fluiden mit einer Membranpumpe (1) nach einem der Ausführungsbeispiele 1 bis 13, wobei ein Pumpenkopf (2) mit einer Antriebskammer (26) und einem Antrieb vorgesehen ist, wobei die Pumpkammer (12) mittels einer Pumpmembran (6) gegenüber der Antriebskammer (26) abgedichtet ist.

Although the present invention has been described above and is defined in the claims, it should be understood that the invention may alternatively be defined according to the following embodiments:

1. 1. Diaphragm pump (1) with at least one pump chamber (12), the pump chamber (12) being connected to an inlet chamber (8) via an inlet valve (15) and to an outlet chamber (10) via two outlet valves (17), this Inlet valve (15) has an inlet opening (16) which can be closed by an inlet valve body and each outlet valve (17) has an outlet opening (18) which can be closed by a respective outlet valve body, the two outlet valves (17) and the inlet valve (15) being in a projection onto a projection plane form a triangle transversely to the longitudinal axis (L) of the pump chamber (12).
2. 2. Diaphragm pump (1), in particular according to exemplary embodiment 1, with at least one pump chamber (12), the pump chamber (12) having an inlet chamber (8) via an inlet valve (15) and an outlet chamber (10) via two outlet valves (17). ) is connected, wherein the inlet valve (15) has an inlet opening (16) which can be closed by an inlet valve body and each outlet valve (17) has an outlet opening (18) which can be closed by a respective outlet valve body, wherein a projection of straight connecting lines which connect adjacent outlet valves (17) connect, on a projection plane transverse to the longitudinal axis (L) of the pump chamber (12), is free of intersections with inlet valves (15).
3. 3. Diaphragm pump (1), in particular according to embodiments 1 or 2, with two pump chambers (12), the pump chambers (12) each having an inlet valve (15) with a common inlet chamber (8) and each having two outlet valves (17). an outlet chamber (10), wherein the inlet valve (15) has an inlet opening (16) which can be closed by an inlet valve body and each outlet valve (17) has an outlet opening (18) which can be closed by a respective outlet valve body.
4. 4. Diaphragm pump (1) according to one of exemplary embodiments 1 to 3, wherein an outlet valve (17) is arranged in an edge region of the pump chamber (12) and an outlet valve (17) in the opposite edge region of the pump chamber (12).
5. 5. Diaphragm pump (1) according to one of exemplary embodiments 1 to 4, wherein the inlet valve (15) is arranged closer to the central axis (M) of the diaphragm pump (1) than the two outlet valves (17).
6. 6. Diaphragm pump (1) according to one of exemplary embodiments 1 to 5, wherein the two outlet valves (17) provided for the pump chamber (12) are arranged offset from one another with respect to a vertical.
7. 7. Diaphragm pump (1) according to one of exemplary embodiments 1 to 6, wherein the inlet chamber (8) and outlet chamber (10) are at least partially formed in a front panel (3).
8. 8. Diaphragm pump (1) according to one of exemplary embodiments 1 to 7, wherein the pump chamber (12) has an inlet valve (15) which is arranged eccentrically in the cross section of the pump chamber (12).
9. 9. Diaphragm pump (1) according to one of exemplary embodiments 1 to 8, wherein the outlet valves (17) are arranged in a circle or in the shape of a segment of a circle.
10. 10. Diaphragm pump (1) according to one of exemplary embodiments 1 to 9, wherein more than one pump chamber (12) is provided, and the arrangement of the respective inlet valve (15) and the respective two outlet valves (17) of the respective pump chambers (12) essentially has rotation invariance with respect to an angle less than 360 ° around the central axis (M).
11. 11. Diaphragm pump (1) according to one of exemplary embodiments 1 to 10, wherein an outlet chamber (10) is annular.
12. 12. Diaphragm pump (1) according to one of exemplary embodiments 1 to 11, wherein the cross section of the pump chamber (12) has at least one substantially straight section on a side wall.
13. 13. Diaphragm pump (1) according to one of exemplary embodiments 1 to 12, wherein a plurality of pump chambers (12) are provided, which are arranged in a grid of columns and rows.
14. 14. Device for conveying fluids with a membrane pump (1) according to one of exemplary embodiments 1 to 13, wherein a pump head (2) with a drive chamber (26) and a drive is provided, the pump chamber (12) being operated by means of a pump membrane (6 ) is sealed from the drive chamber (26).

Claims (13)

Diaphragm pump (1) with at least one pump chamber (12), the pump chamber (12) being connected to an inlet chamber (8) via an inlet valve (15) and to an outlet chamber (10) via two outlet valves (17), the inlet valve ( 15) an inlet opening (16) which can be closed by an inlet valve body and each outlet valve (17) has an outlet opening (18) which can be closed by a respective outlet valve body, the two outlet valves (17) and the inlet valve (15) being in a projection onto a projection plane transverse to the Longitudinal axis (L) of the pump chamber (12) forms a triangle, with the outlet chamber (10) being annular. Diaphragm pump (1), in particular according to claim 1, with at least one pump chamber (12), the pump chamber (12) being connected to an inlet chamber (8) via an inlet valve (15) and to an outlet chamber (10) via two outlet valves (17). is, wherein the inlet valve (15) has an inlet opening (16) which can be closed by an inlet valve body and each outlet valve (17) has an outlet opening (18) which can be closed by a respective outlet valve body, wherein a projection of straight connecting lines which connect adjacent outlet valves (17), on a projection plane transverse to the longitudinal axis (L) of the pump chamber (12) is free of intersections with inlet valves (15), the outlet chamber (10) being annular. Diaphragm pump (1), in particular according to claim 1 or 2, with two pump chambers (12), the pump chambers (12) each having an inlet valve (15) with a common inlet chamber (8) and each having two outlet valves (17) with an outlet chamber (10), wherein the inlet valve (15) has an inlet opening (16) which can be closed by an inlet valve body and each outlet valve (17) has an outlet opening (18) which can be closed by a respective outlet valve body, an outlet chamber (10) being annular. Diaphragm pump (1) according to one of claims 1 to 3, wherein an outlet valve (17) is arranged in an edge region of the pump chamber (12) and an outlet valve (17) in the opposite edge region of the pump chamber (12). Diaphragm pump (1) according to one of claims 1 to 4, wherein the inlet valve (15) is arranged closer to the central axis (M) of the diaphragm pump (1) than the two outlet valves (17). Diaphragm pump (1) according to one of claims 1 to 5, wherein the two outlet valves (17) provided for the pump chamber (12) are arranged offset from one another with respect to a vertical. Diaphragm pump (1) according to one of claims 1 to 6, wherein the inlet chamber (8) and outlet chamber (10) are at least partially formed in a front panel (3). Diaphragm pump (1) according to one of claims 1 to 7, wherein the pump chamber (12) has an inlet valve (15) which is arranged eccentrically in the cross section of the pump chamber (12). Diaphragm pump (1) according to one of claims 1 to 8, wherein the outlet valves (17) are arranged in a circle or in the shape of a segment of a circle. Diaphragm pump (1) according to one of claims 1 to 9, wherein more than one pump chamber (12) is provided, and the arrangement of the respective inlet valve (15) and the respective two outlet valves (17) of the respective pump chambers (12) essentially ensures rotation invariance with respect to an angle less than 360 ° about the central axis (M). Diaphragm pump (1) according to one of claims 1 to 10, wherein the cross section of the pump chamber (12) has at least one substantially straight section on a side wall. Diaphragm pump (1) according to one of claims 1 to 11, wherein a plurality of pump chambers (12) are provided, which are arranged in a grid of columns and rows. Device for conveying fluids with a membrane pump (1) according to one of claims 1 to 12, wherein a pump head (2) with a drive chamber (26) and a drive is provided, the pump chamber (12) being opposite by means of a pump membrane (6). the drive chamber (26) is sealed.

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