WO2019219122A1

WO2019219122A1 - Diaphragm system control having a magnetically retained closure element

Info

Publication number: WO2019219122A1
Application number: PCT/DE2019/100407
Authority: WO
Inventors: Christian Arnold; Martin Reinhard
Original assignee: Prominent Gmbh
Priority date: 2018-05-15
Filing date: 2019-05-06
Publication date: 2019-11-21
Also published as: DE102018111601A1; CN112189094A; DE102018111601B4; US20210215151A1; CN112189094B

Abstract

The present invention relates to a diaphragm pump having a conveying chamber and a working chamber, wherein the conveying chamber comprises a pressure connection and a suction connection, and the working chamber can be or is filled with a hydraulic fluid and is operatively connected to a pressure generator in order to apply an oscillating pressure to the hydraulic fluid, further comprising a diaphragm which has at least one diaphragm layer and a diaphragm core and which separates the conveying chamber and the working chamber from one another, and which can be moved from a pressure stroke position into a suction stroke position and back again, the volume of the conveying chamber in the pressure stroke position of the diaphragm being smaller than in the suction stroke position. The diaphragm is or can be brought into operative connection with a diaphragm return device comprising a traction rod, which applies or can apply a force to the diaphragm in the direction of the suction stroke position and further comprising a storage chamber for accommodating the hydraulic fluid, the working chamber and the storage chamber being connected to one another via a channel closed by a closure element. The closure element is connected to the traction rod so as to be movable relative thereto, such that the closure element can be moved from a closed position into an open position and back again, and the closure element comprises a magnet and/or is operatively connected to a magnet which locks the closure element in the closed position, and the closure element is moved into the open position and the channel is opened when the diaphragm is deflected over the pressure stroke position away from the suction stroke position.

Description

Membrane system control with magnetically held closing element

The present invention relates to a diaphragm system control with magnetically held closure element.

Diaphragm pumps have a delivery chamber with a suction port and a pressure port and a working space which is separated by a membrane from the pumping chamber. In order to convey a medium, the membrane is reciprocated between a first and second position, in which the working space is filled with a hydraulic fluid, which is acted upon by an oscillating pressure. The two positions of the membrane are usually referred to as Druckhubposition and as suction stroke position.

Usually, the pressure connection via a check valve

trained pressure valve connected to the delivery chamber and the suction port connected via a likewise designed as a check valve mammal valve with the pumping chamber. During the movement of the membrane from the first to the second position, the so-called

Suction stroke, the volume of the delivery chamber is increased, whereby the pressure drops in the delivery chamber. As soon as the pressure in the delivery chamber falls below the pressure in a suction line connected to the suction connection, the mammal valve opens and the suction connection closes

sucking medium sucked into the delivery room. As soon as the diaphragm moves from the second position back to the first position (this is the so-called pressure stroke), the volume in the pumping chamber decreases and the pressure in the pumping chamber rises. The mammal valve is closed to prevent backflow of the medium to be pumped into the suction line. As soon as the pressure in the delivery chamber exceeds the pressure in a pressure line connected to the pressure connection, the pressure valve is opened, so that the delivery medium located in the delivery chamber can be pressed into the delivery line.

The membrane itself can be resiliently biased in the direction of the suction stroke position. The membrane will always assume a position in which the forces acting on the membrane cancel each other out. Here, under normal conditions, the effect of the fluid pressure in the delivery chamber and by the resilient bias in the direction

Suction stroke generated forces against the forces generated by the fluid pressure in the working space.

The application of the hydraulic fluid with an oscillating pressure thus leads to an oscillating movement of the membrane and, associated therewith, to an oscillating pumping action of the delivery fluid from the suction line into the pressure line.

Hydraulically operated diaphragm pumps are preferred in the

Promotion of delivery fluids under high pressures for use, since the hydraulic fluid uniform loading of the membrane and thus this has a long service life.

In this case, the pressurization of the hydraulic fluid with the

oscillating pressure mostly by means of a movable piston. It may occur that the amount of fluid in the working space deviates from the desired amount in the case of severe contamination of the mammal valve or a flow around the piston. In this case, either too much hydraulic fluid may be accumulated in the working space, so that the diaphragm is deflected beyond its Druckhubposition also, or there may be too little hydraulic fluid in the working space, so that the membrane can not reach the Druckhubposition. In the first case, there is a risk of excessive strain on the diaphragm, which reduces its life and can cause damage. In the second case, the delivery volume per stroke is undesirably reduced.

Ideally, the supply of the diaphragm pump should be ensured under all load and operating conditions, damage to the diaphragm pumps and in particular to the membrane itself

avoid. In particular, problems that can occur, for example, through a sealed or dirty suction line, are a problem. In this case, too little or no delivery fluid is introduced into the delivery chamber during the suction stroke. Deviating from

Normal operation act of the fluid pressure in the delivery chamber acting forces against the forces generated by the fluid pressure in the working space and the forces generated by the resilient bias. Due to a too small amount of conveying fluid in the delivery chamber, the membrane can be deflected via the Druckhubposition, since the fluid pressure in the pumping chamber is too low.

For this problem, solutions are described in the prior art, for example, DE 10 2013 105 072 A1 discloses a solution according to which a movement of the membrane beyond the Druckhubposition a passage to a reservoir of the hydraulic fluid is released, so that the pressure in Workspace is automatically reduced. For this is located on a return element of the membrane, a closure element which is acted upon by spring force with pressure to the

To close passage between the working space and the storage room. If the membrane is now moved beyond the Druckhubposition, the closure element is moved away from the passage so that it is open and a pressure equalization between the working space and the storage space takes place. As a result, the pressure in the working space drops and the return element moves the diaphragm back in the direction of the suction stroke position.

However, the known from DE 10 2013 105 072 A1 solution has the

Disadvantage that due to component tolerances of the elements used there, the holding force of the closure element may vary. Thus, a precise holding force of the closure element can not be adjusted and in particular can not be ensured during prolonged operation. In addition, the closing function of the described there

Closure element of the size and the distance covered by the membrane dependent against which acts by the spring element acted upon by force closure element. Furthermore, it is disadvantageous that the closure element does not work wear-free, since transverse forces act on the closure element.

The object of the present invention is therefore to overcome the disadvantages of the prior art, and in particular a Diaphragm pump to deliver a precise and wear-free

Secured device which prevents damage to the membrane in case of failure.

This object is achieved by a diaphragm pump with a

Pumping room and a working space, wherein the pumping room a

Pressure port and a suction port comprises, and wherein the working space is filled with a hydraulic fluid or filled and is in operative connection with a pressure generating device to the

Hydraulic fluid to act upon an oscillating pressure, further comprising a membrane having at least one membrane layer and a membrane core, which separates the delivery chamber and the working space, and which can be transferred from a Druckhubposition in a suction stroke position and back again, wherein the volume of the delivery chamber in the Druckhubposition of the membrane is smaller than in the suction stroke position, and wherein the membrane with a membrane retractor comprising a tie rod is engageable or is operatively connected, which acts on the membrane in the direction of the suction stroke position with a force or

can act upon, and further comprising a reservoir for receiving the hydraulic fluid, and wherein the working space and the reservoir are connected to each other via a sealed with a closure element channel, wherein the closure element is connected relative to the pull rod movable therewith, so that the

Closure element can be transferred from a closed position to an open position and back, and wherein the closure element comprises a magnet and / or is in operative connection with a magnet which locks the closure element in the closed position, and wherein the closure element is transferred to the open position and the channel is opened is when the diaphragm is deflected away from the suction stroke position via the push stroke position.

As described act in the normal case, the of the fluid pressure in the

Delivery chamber and by the resilient bias in the direction

Suction stroke generated forces against the forces generated by the fluid pressure in the working space. If too much working fluid in the Working space is located, the membrane can be deflected over the Druckhubposition, since the fluid pressure in the working space is too high.

The invention is based on the surprising finding that a movement of the membrane beyond the Druckhubposition also can be effectively prevented when this movement of the membrane is coupled with an opening of the channel according to the invention. If the membrane is moved beyond the Druckhubposition out, so gives the

Closing element free the channel and the fluid pressure in the working space decreases. In this case, the maximum permissible deflection of the diaphragm beyond the pressure stroke position can be determined by the selection of the marginal force of the magnet encompassed by the closure element or in operative connection therewith.

It is inventively provided that the

Can move closure element relative to the membrane retractor and is connected thereto. This relative movement ensures that the channel remains closed as long as the

Membrane moves within the given deflections. The magnet or magnets ensure the closed state of the channel.

In principle, several embodiments are conceivable to bring the or the magnet with the closure element in operative connection. According to the invention may be preferred according to a first embodiment of the present invention, that the working space is arranged in a housing, wherein the housing in the region of the channel, in particular around the channel, comprises a magnet or forms a first magnet, wherein the magnet with the Closure element is at least in its closed position in operative connection.

It has proved to be advantageous according to an embodiment, when the housing extends through which the channel itself is magnetic and / or comprises a magnet. Thus, the closing element movably connected to the retractor is officiated in its position without it itself having to include a stomach. Rather, it is with the magnetic field of the integrated into the housing Magento in operative connection.

Alternatively or additionally, it may be advantageous according to a second embodiment of the present invention that the closure element comprises a second magnet, in particular in the region of its end facing the channel, in particular on the channel

facing the end, wherein the magnet is in operative connection with the housing enclosing the working space, in particular around the passage, at least in the closed position.

According to this second embodiment, a second magnet is included as an alternative to the first magnet of the diaphragm pump according to the invention. The second, arranged on the closure element, the magnet is preferably at the channel facing the end of the

Closing element arranged so that its magnetic field can interact with the housing of the working space, preferably in the region of the channel, and not primarily with the retractor as such.

Furthermore, a combination of two magnets according to a third embodiment of vorliegednen invention may be advantageous, according to this third embodiment, the closure element comprises a third magnet, in particular on and / or in the region of its end facing the channel, and The housing enclosing the working space in the region of the channel, in particular around the channel, comprises a fourth magnet or a fourth

Magnets forms, with the polarities of the poles of the

opposite portions of the third and fourth magnets are different, and the third and fourth magnets are at least in the closed position in operative connection with each other.

The use of two interacting magnets can prove to be particularly advantageous to provide high forces.

According to a further fourth embodiment it can be provided that the pull rod comprises a fifth magnet arranged in particular at and / or in the region of the end facing away from the channel of the closure element and / or the closure element comprises a sixth magnet, in particular arranged on the end remote from the channel of the closure element, wherein the polarities of the poles of the opposite regions of the fifth and sixth magnets are identical, and the fifth and sixth magnet are at least in the closed position of the closure element in operative connection with each other.

According to the invention it has also proved to be advantageous that

instead of an adhesive force closing the channel by means of the

Closing element by a on the closure element in

Closing direction acting pressure force is provided, which is generated by the repulsion of two fifth and sixth magnets.

It may prove to be particularly advantageous that the membrane is releasably fixed by means of a membrane holding member which is at least partially inserted into the tie rod, wherein the fifth magnet is covered by the membrane holding member, in particular on or in the region of the Diaphragm facing away, inserted into the pull rod, end of the membrane holding element.

The membrane can be connected according to the invention by means of a membrane holding member with the tie rod. In this case, a membrane holding element usually comprises a rod-shaped element which can be passed through a central opening of the membrane layers and which, in particular, comprises a screw thread, and which can be connected to a corresponding thread of the draw bar. If the fifth magnet is now integrated into the rod-shaped element, then it is easy to access this magnet, since the membrane retaining element can be removed for a membrane change. Likewise, easy access to the six magnets is possible.

Furthermore, according to a fifth embodiment of the invention

Advantageous present invention, that a seventh magnet is included with the closure element and the working space surrounding housing is in operative connection, wherein the seventh magnet is not fixedly connected to the closure element, the tie rod and the housing, and wherein the magnetic field strength and thus the adhesion of the magnet to the closure element is always greater than on the housing.

Is essential to the invention is that the closure element by means of the generated magnetic force of the magnet or the veschließt the channel safely, as long as the membrane is not moved beyond the Druckhubposition addition.

According to embodiments of the present invention

Invention, the magnet or magnets with the pull rod, the

Closing element and / or connected to the housing or be integrated into this. However, it is also advantageously provided by the present invention that the magnet is not with these

Elements connected and not integrated into these, but exclusively with one or more of these elements in

Active compound is.

With regard to all embodiments of the invention, it may be advantageous that the first, second, third, fourth, fifth, sixth and / or seventh magnet in the form of a spherical magnet, bar magnet, cone magnet, disc magnet or ring magnet is formed.

Depending on the choice of the embodiment of the magnet, the magnet itself can form the closure element.

Advantageously, it can be provided that the magnetic

Field strength of the first, second, third, fourth, fifth, sixth and / or seventh magnet is selected such that if for the pressure difference between the pressure in the reservoir p2 and the pressure in the working space pi p2 - pi> a, where a is a predetermined pressure, the closure element is transferred from the closed position to the open position. By this measure it is ensured that at fluid loss in

Working space fluid can be refilled from the storage room as soon as the pressure in the working space falls below a predetermined value.

Furthermore, according to an embodiment of the present invention, it may be preferred that the housing enclosing the working space comprises a wall element comprising the channel, wherein the wall element within the housing is movable relative thereto along the direction of movement of the membrane retractor, and wherein the wall element is biased by a spring element in the direction of the membrane retractor.

Due to the movable arrangement of the wall element of the housing and thus of the channel, the additional provision of a pressure relief valve can be avoided. Should the pressure in the working space rise too much, this will lead to a movement of the wall element and thus of the channel in the opening, with the result that the closure element is moved from the closed position and thus the channel is opened. Thus, the pressure in the working space is reduced again by the connection to the storage room.

It may be provided in particular that the resilient

Biasing of the wall member is selected such that when the pressure difference between the pressure in the reservoir p2 and the pressure in the working space pi pi - p2> b, where b is a predetermined pressure, the wall element moves away from the closure element and thereby the channel is released ,

Finally, it may be provided that the

Membrane return means comprises a further spring element, which is connected to the tie rod or is in operative connection therewith, so that the membrane by means of the spring element in the direction of

Suction stroke position is biased by a force.

Further features and advantages of the invention will become apparent from the

following description, in the embodiments of the invention is explained by way of example with reference to schematic drawings, without thereby limiting the invention.

In this case shows:

1 shows a detail of a first embodiment of a

inventive diaphragm pump in a side sectional view;

2 shows a detail of a second embodiment

a membrane pump according to the invention in a lateral sectional view;

3 shows a detail of a third embodiment

a membrane pump according to the invention in a lateral sectional view; and

4 shows a section of a fourth embodiment

a membrane pump according to the invention in a lateral sectional view.

1 shows by way of example an embodiment of a membrane pump 1 according to the invention with a delivery chamber 3 and a working space 5, which are separated from each other by a membrane 7. Of the

Working space 5 is filled with a hydraulic fluid and is in operative connection with a pressure generating device, not shown, to the

Apply hydraulic fluid with an oscillating pressure.

By the oscillating pressure working chamber 5 of the diaphragm pump 1, the diaphragm 7 can be transferred from a Druckhubposition in a suction stroke position and back again, wherein the volume of the delivery chamber 3 in the Druckhubposition the membrane 7 is smaller than in the

Saughubposition.

The membrane 7 stands with a membrane retractor. 9

comprising a pull rod 11 in operative connection, which acts on the membrane 7 in the direction of the suction stroke position with a force. For this purpose, the membrane annealing device according to the embodiment shown comprises a spring 13. Furthermore, the membrane pump according to the invention comprises a

Reservoir 15 for receiving the hydraulic fluid, wherein the working space 5 and the storage space 15 are connected to each other via a closed with a closure element 17 channel 19. Will that be

Closing element 17 thus transferred to its open position, the storage space 15 is via the channel 19 with the working space 5 in direct communication.

The closure member 17 is movably connected to the tie rod 11 so that the closure member 17 can be transferred from a closed position to an open position and back. The movable connection of closure element 17 and

Pull rod 11 has another advantage. The pull rod 11 itself must be arranged movably within the working space 5 of the diaphragm pump 1, since this must accompany the movements of the diaphragm 7 from the suction stroke position to the pressure stroke position and vice versa. So that the closure element 17 remains in the closed position, provided that the pull rod 11 moves within a predetermined frame, it is in turn movably connected to the pull rod 11.

It is shown in Figure 1 that the closure element 17 a

Magnet 21 includes the closure member 17 in the

Locked position locked, and the closure member 17 in the

Opened transferred position and the channel 19 is opened when the diaphragm 7 is deflected over the Druckhubposition of the suction stroke position away. The magnet 21 is directly covered by the closure element 17 and forms the closing end of the

Locking element 17 off.

In this case, the magnetic field strength of the magnet 21 is preferably selected such that if, for the pressure difference between the pressure in the reservoir 15 p2 and the pressure in the working space 5 pi p2 - pi> a, where a is a predetermined pressure, the closure element 17 is transferred from the closed position to the open position. The further can be seen in Figure 1, that the working space 5 enclosing housing 23 has a channel 19 comprehensive wall element 25, wherein the wall element 25 within the housing 23 relative to this along the direction of movement of the

Membrane retractor 9 is movable, and wherein the wall element 25 by means of a spring element (not shown) in the direction of

Membrane return device 9 is biased.

The channel 19 can thus also be opened when the

Wall element 25 moves away from the closure element 17, so that can be dispensed with an additional pressure relief valve.

In the further figures, further embodiments of the

diaphragm pump 1 according to the invention.

In Figure 2, the diaphragm pump 1 according to the invention comprises a

Magnet 21 ^' which is formed by the wall element 25 and is covered by this. It is obvious that the magnet 21 ^'can also be brought into operative connection with the closure element 17 or is stationary.

Figures 3 and 4 show two further inventive

Embodiments of the present invention. In this case, the magnets 21 ^'arranged at the end of the channel 19 of the closure element 17 facing away from both of these embodiments.

As can be seen in Figure 3, the pull rod 11 comprises a magnet 21 ^" , which is positioned at the end facing away from the channel 19 of the closure member 17 and the closure member 17 includes a further magnet 21 ^" , wherein the polarities of the poles of

opposing areas of the magnets 21 are identical ^"and repel. Thus, in contrast to the present invention

Embodiments in Figures 1 and 2 provided no magnetic adhesion, but the magnetic fields press that

Closure element 17 on the channel 19th

A further development of the embodiment according to FIG. 3 is shown in FIG. It should be shown that the membrane 7 by means of a Membrane holding member 27, which is partially inserted into the pull rod, is releasably fixed. The magnet arranged in the pull rod 11 is thus directly connected to the membrane holding element 27, so that the effect of the repelling forces of the magnets 21 ^"is identical to the embodiment according to Figure 3, but a simpler access for the exchange of the magnets is provided Replacement of the magnets 21 ^" preferably via a partial disassembly of the drawbar 11 done.

The in the preceding description, the claims and the

Drawings disclosed features of the invention may be essential both individually and in any combination for the realization of the invention in its various embodiments.

Claims

claims

1. diaphragm pump with a delivery chamber and a working space, wherein

the delivery space comprises a pressure port and a suction port, and wherein

the working space is filled or filled with a hydraulic fluid and is operatively connected to a pressure generating device to pressurize the hydraulic fluid with an oscillating pressure, further comprising a diaphragm having at least one diaphragm layer and a diaphragm core which separates the pumping chamber and the working space, and from a Druckhubposition in a suction stroke position and back again

is convertible, wherein the volume of the delivery chamber in the Druckhubposition the membrane is smaller than in the suction stroke position, and wherein

the membrane is engageable or can be brought into engagement with a membrane return device comprising a pull rod which can act on the membrane with a force in the direction of the suction stroke position, and furthermore comprising a reservoir for accommodating the membrane

Hydraulic fluids, and wherein

the working space and the storage space are connected to each other via a sealed with a closure element channel, wherein the

Closing element is connected relative to the pull rod movable therewith, so that the closure element can be transferred from a closed position to an open position and back, characterized in that

the closure element comprises a magnet and / or with a

Magnet is operatively connected, the closure element in the

Locked position locked, and wherein the closure element in the

Opened position and the channel is open when the diaphragm is deflected over the Druckhubposition of the suction stroke position away.

2. Diaphragm pump according to claim 1, characterized in that

the working space is arranged in a housing, wherein the housing in the region of the channel, in particular around the channel, comprises a magnet or forms a first magnet, the magnet with the closing element at least in its closing position in

Active compound is.

3. Diaphragm pump according to claim 1 or claim 2, characterized in that

the closure element comprises a second magnet, in particular in the region of its end facing the channel, in particular at the end facing the channel, the magnet being in operative connection with the housing enclosing the working space, in particular around the channel, at least in the closure position.

4. Diaphragm pump according to one of the preceding claims, characterized

marked that

the closure element comprises a third magnet, in particular on and / or in the region of its end facing the channel, and the housing enclosing the working space in the region of the channel, in particular around the channel, comprises a fourth magnet or forms a fourth magnet, wherein the Polarities of the poles themselves

opposite areas of the third and fourth magnets

are different, and the third and fourth magnets are at least in the closed position in operative connection with each other.

5. Diaphragm pump according to one of the preceding claims, characterized

marked that

the pull rod comprises a fifth magnet, arranged in particular on and / or in the region of the end of the channel facing away from the channel

Closure element and / or the closure element a sixth

Magnet includes, in particular arranged on the the channel opposite end of the shutter member, wherein the polarities of the poles of the opposing portions of the fifth and sixth magnets are identical, and the fifth and sixth magnet at least in the

Closure position of the closure element are in operative connection with each other.

6. Diaphragm pump according to claim 5, characterized in that

the membrane by means of a membrane holding element, the at least

is partially inserted into the pull rod, is detachably fixed, wherein the fifth magnet is covered by the membrane holding member, in particular on or in the region of the membrane facing away, inserted into the pull rod end of the membrane holding member.

7. Diaphragm pump according to one of the preceding claims, characterized

marked that

a seventh magnet is included, which is in operative connection with the closure element and the housing surrounding the working space, wherein the seventh magnet is not fixed to the closure element, the tie rod and the

Housing is connected, and wherein the magnetic field strength and thus the adhesion of the magnet to the closure element is always greater than on the housing.

8. Diaphragm pump according to one of the preceding claims, characterized

marked that

the first, second, third, fourth, fifth, sixth and / or seventh magnet in the form of a spherical magnet, bar magnet, cone magnet, disc magnet or ring magnet is formed.

9. Diaphragm pump according to one of the preceding claims, characterized

marked that

the magnetic field strength of the first, second, third, fourth, fifth, sixth and / or seventh magnets is selected such that when for the pressure difference between the pressure in the reservoir p2 and the pressure in the working space pi, p2 - pi> a, where a is a predetermined pressure, the closure element is transferred from the closed position to the open position.

10. Diaphragm pump according to one of the preceding claims, characterized

marked that

the housing enclosing the working space has a wall element comprising the channel, wherein the wall element within the housing relative to this along the direction of movement of the

Membrane retractor is movable, and wherein the wall element is biased by a spring element in the direction of the membrane retractor.

11. Diaphragm pump according to claim 10, characterized in that

the resilient bias of the wall element is selected such that when the pressure difference between the pressure in the reservoir p2 and the pressure in the working space pi is pi p2> b, where b is a predetermined pressure, the wall element moves away from the closure element and thereby the channel is released.

12. Diaphragm pump according to one of the preceding claims, characterized

marked that

the membrane return device comprises a further spring element, which is connected to the pull rod or is in operative connection with it, so that the membrane is biased by the spring element in the direction of the suction stroke position with a force.