DE10117531A1 - Membrane pump for pumping gaseous, liquid and pasty materials comprises a membrane valve having a holding-down device preventing downstream lifting of a valve membrane from a valve plate - Google Patents

Abstract

Membrane pump (1) comprises a membrane valve (10, 11, 11') having a holding-down device (14, 18') preventing downstream lifting of a valve membrane from a valve plate. Preferred Features: The valve plate is made of a thermally insulating material, preferably polyetheretherketone (PEEK). The membrane valve has circular valve channels (12, 16, 16') and a disk membrane (13, 17, 17') with central fixing. The holding-down device is a circular disk radially arranged within the valve channels.

Description

The invention relates to a diaphragm pump, with several pumps chambers, each by means of a pump membrane against one Drive chamber are sealed, the respective pump diaphragm ran over an assigned pump element with an in the An drive chamber arranged swashplate is connected and by wobbling the swashplate into a perio Dische axial pumping movement is displaceable, the pumping chambers pressure-dependent via inlet valves with an inlet chamber and connectable to an outlet chamber via an outlet valve are, and at least one of the valves with a diaphragm valve several arranged in a valve plate and by one Valve membrane closable valve channels is formed.

Diaphragm pumps have been known for a long time and are used in below various designs and manufactured for different branches used. Through diaphragm pumps, gaseous, liquid ge and pasty materials are promoted, with a rela tiv exact control of the volume flow is possible. membrane Pumps of the generic type are mainly used in mixing and Filling systems for pumpable food, Kos metika and medication used. Here, the membrane pump in fixed time cycles and when changing the pumping medium cleaned and possibly disinfected, what by the Promotion of a cleaning solution by the diaphragm pump can. Under certain circumstances, however, this is a disassembly of the Diaphragm pump and cleaning of the components concerned conducive.

A generic diaphragm pump is for example from DE 198 56 754 A1 known in which one versus a drive axle  inclined bearing pin for storing the Swashplate and for generating their wobble movement in such a way is arranged that the pin axis is the longitudinal axis of the An drive axis intersects at approximately the height of the pump membrane. here the radial load on the pump membranes is greatly reduced graced and their lifespan increased significantly. The disadvantage is however, that it is on the intake valves and the exhaust valve on the output side of the valve channels for deposits between the valve membrane and the valve plate can come not completely by rinsing with a cleaning solution dig can be removed. Since the deposits at ge opened diaphragm valve in the dead water flow with less Flow rate between the valve plate and the valve diaphragm and with the diaphragm closed ran valve between the valve plate and the valve membrane will also be completely closed Diaphragm valve prevented. A complete cleaning of the Diaphragm pump is therefore only after disassembly components in contact with the pump medium possible, what is time consuming and correspondingly expensive.

The problem thus arises, the generic membrane pump to improve functionality to improve that and in particular with a view to the fact that cleaning and disinfection of the diaphragm pump without a de assembly of components in a simple manner by the promotion a cleaning solution is possible, d. H. the diaphragm pump c.i.p.-capable (c.i.p. = cleanable in place) and s.i.p.-capable (s.i.p. = sterilizable in place).

The problem is inventively in connection with the waiter Concept of claim 1 solved in that the membrane ven til a hold-down to avoid a downstream Has lifted the valve membrane from the valve plate.

Advantageous embodiments of the membrane pump according to the invention pe are given in claims 2 to 20.  

By using the hold-down device, a downstream is The valve membrane is lifted off the valve plate when opening of the diaphragm valve and thus the penetration of the pump medium into prevents the resulting space. Without the Niederhal The pump medium penetrates when the diaphragm valve is opened the resulting space and is closed when the Diaphragm valve only partially pushed out again. The remaining residue is then between the valve membrane and the Valve plate is jammed and is also possible by rinsing not fully ent to promote a cleaning solution distant, as with the diaphragm valve open in the downstream sided, d. H. with a plate membrane radially inside and with egg ner slot membrane radially outer space in each case a dead water flow with low flow velocity established. The use of hold-downs is therefore a fold and inexpensive means to without dismantling the membrane pump to avoid deposits that are difficult to remove. The invent diaphragm pump according to the invention is thus c.i.p.-capable and at Ver use of heat-resistant materials for those with the Pumpmedi to be able to contact components that are also s.i.p. The never the holder can in principle be designed as separate components be or be formed in adjacent housing components, so that the function is given in the assembled state.

When using a diaphragm valve in the valve plate circularly arranged valve channels and a plate membrane with central attachment, the hold-down is advantageous as circular and arranged radially within the valve channels Washer designed to attach the valve membrane to the valve plate is pressed. The plate membrane can then be used for radio tion improvement, d. H. in the case of a central exhaust valve with all-round open and closed areas to the door of these areas and in general to increase flexibility valve diaphragm by means of radial recesses in Win kel sectors.

The hold-down is analogous when using a membrane valve with Ven arranged in a circle in the valve plate valve channels and a slit membrane with peripheral fastening  advantageous as an annular and radially outside the Ventilka channels arranged disc, with which the valve diaphragm is pressed against the valve plate.

Penetration and deposition of pumping medium between the respective valve membrane and the valve plate can be advantageous further prevented by the valve membrane with central fastening radially inside and with peripheral loading fastening radially on the outside with an annular sealing bead is provided. This sealing bead is for engagement in a Annular groove of the valve plate is provided and is from the Nieder holder fixed there so that another radial penetration of pump medium is impossible.

If the hold-down device is radial just straight up to the valve channel le approaches that are round or angular sector-shaped can be due to the opening of the membrane vein the resulting warping and constriction of the elasti existing valve diaphragm material for training gap between the valve membrane and the Valve plate and thus pump medium deposit. This can be prevented by the hold-down device Valve channels partially covered radially.

Since the ef fective cross-section of the valve channels reduced and thus the Diaphragm pump throttled, d. H. whose throughput is reduced, it is advantageous if the hold-down device in the covering area range of valve channels corresponding to the radial bending line the open valve diaphragm axially from the valve plate withdrawn is formed. This ensures that the Valve diaphragm when opening the diaphragm valve, depending on Execution of the valve membrane starting at the radially inner or outer edge, bulges without lifting off the valve plate.

When the diaphragm valve is formed in one part The hold-down device can be arranged in the sector of the circle completely cover the valve membrane in the channel-free sector,  so that there is no pumping medium reliably in this area can get between the valve membrane and the valve plate. To simplify assembly, the hold-down and an o the multiple fasteners, e.g. B. a central thread bolt, advantageously formed in one piece. But it is the same expedient, the hold-down device and the valve membrane in one piece train what z. B. can be realized in that the never the holder is embedded in the valve membrane during manufacture will, d. H. when using rubber as membrane material in vulcanized the valve membrane and when using an E lastomer plastic as a membrane material in the valve membrane is poured. Finally, the hold-down device, the Be fastening element and the valve membrane also completely as be a single integrated component.

When using several similar diaphragm valves, what to The hold-down devices mostly apply to the inlet valves the diaphragm valves in question preferably in one component, which can be designed, for example, as a perforated disc summarized. This reduces the number of components adorned, and it will be functional without any restriction Costs in manufacturing and assembly saved.

To avoid flow separation and consequently from Ab Storage of pump medium in the inlet area of the valve channels the valve channels advantageously have an egg on the input side ne rounded inlet contour. As a positive side effect he this also results in a lower flow resistance Valve channels or the relevant diaphragm valve, so that a higher throughput with the same drive power Diaphragm pump results, or a ge for the same throughput less drive power is required.

In order to avoid drainage in the outlet area of the valve channels wrestled the blunt surface between the valve plate and the It is to reduce the valve membrane, especially when using sectoral valve channels, advantageous, the Ra dial webs between the valve channels similar to a wing pro fil to be tapered on the outlet side. Also  this is by avoiding or reducing the dead water areas behind the radial webs and due to the diffuse careful expansion of the valve channels as a positive side effect fect the flow resistance of the valve channels or the diaphragm valve is reduced.

To avoid undesired heating of the pump medium by transferring friction-related heat from the start drive chamber in the pumping chambers, but also to avoid Conduction of heat from the pumping medium into the drive chamber, what especially in the case of sterilization of the diaphragm pump with superheated steam to problems in the storage of the swash plate and the drive shaft can lead is a thermal insulation tion of the pump chambers from the drive chamber makes sense. A Such insulation can be achieved in a simple manner that the valve plate is made of a thermally insulating Material such as B. Peek (polyether ether ketone) becomes.

In order to exchange defective diaphragms, the diaphragm pump does not The pump membranes and the valve membranes are advantageously designed such that they can be mounted on one side of the pumping chambers, which, for. B. through the use of screwable in threaded holes Threaded bolts happen as fastening elements of the membranes can. In particular, the threaded holes for attaching the Inlet membranes should be designed as blind holes to be unevenness, such as hole holes and protruding Bolts, and thus deposits in the inlet chamber to avoid. With such a design of the diaphragm pump are especially the pump membranes after dismantling the the chamber comprising the inlet chamber and the outlet chamber housing and the valve plate - if designed accordingly even without tools - easily removed from the drive chamber interchangeable side. An expensive disassembly of the The drive housing is then not required.

To improve the storage and sealing of the pump membranes by clamping between two components, e.g. B. the valve plate  and the drive housing, they mostly have radial outside each have an annular sealing bead. Through the positive external storage will damage the Pump membranes avoided due to excessive clamping. the nor can it U. by the alternating load to a single line come one of the pump membranes. To be an on in this case penetrate the pumping medium into the drive chamber and consequently damage to the bearings of the swash plate and to drive shaft and escape of the pump medium into the environment to avoid can between the pump membranes and the An drive chamber an additional safety seal is arranged become. This security seal can, for example, as flexible membrane formed and on the outer, the pump chamber side facing away from the swash plate and the inner nenwand of the drive housing can be arranged.

Further details of the invention emerge from the following detailed description and the attached Drawings that exemplify the invention according to the diaphragm pump.

Show:

Fig. 1 shows a preferred embodiment of the membrane pump of the invention in the longitudinal central section,

FIGS. 2a-2b., The valve plate of the diaphragm pump of Figure 1 in an axial plan view and in a radial cross-section,

FIGS. 3a-3b. An advantageous embodiment of the valve diaphragm of the outlet valve of the diaphragm pump of Figure 1 in an axial plan view and in a radia len cross-section,

FIGS. 4a-4b, a preferred embodiment of the valve membrane ei nes of the intake valves of the diaphragm pump of Figure 1 in an axial plan view and in a radial cross-section.

FIGS. 5a-5c are side views in section on the function of diaphragm valves according to the prior art,

Fig. 6a-6c: side views in section for the function of diaphragm valves of the diaphragm pump according to the invention

Fig. 7a-7b: top view and side view in section of a diaphragm valve and

Fig. 8a-8b: top view and side view of a slit diaphragm ranventils.

In Fig. 1, a diaphragm pump 1 according to the invention is shown in longitudinal central section, which is constructed largely rotationally symmetrical and is composed of several, essentially scheibenförmi gene components: a chamber housing 2 , a Ven tilplatte 3 , a drive housing 4 , and a bearing housing 5 . The chamber housing 2 has a centrally arranged outlet chamber 6 with an outlet pipe 7 and an annularly formed inlet chamber 8 with an inlet pipe 9 . The valve plate 3 is provided with a centrally arranged outlet valve 10 and a plurality of inlet valves 11 , 11 'evenly distributed over the circumference, of which only two are shown in the sectional view of FIG. 1, namely the upper inlet valve 11 and the lower inlet valve 11 '. From the outlet valve 10 is designed as a plate membrane valve and has a plurality of valve channels 12 distributed over the circumference, a plate membrane 13 , and a disk-shaped hold-down device 14 . The hold-down device 14 is vulcanized into the plate membrane 13, which is made of rubber in the present case, and is firmly connected to a screw bolt 15 by means of which the two components 13 , 14 are fastened on the valve plate 3 . The inlet valves 11 , 11 'are also designed as plate diaphragm valves and each have a plurality of valve channels 16 , 16 ', a plate diaphragm 17 , 17 ', and a disk-shaped hold-down device 18 , 18 '. The hold-down 18 , 18 'are each embedded in the associated plate membrane 17 , 17 ' and firmly connected to a screw bolt 19 , 19 ', by means of which the components 17 , 18 and 17 ', 18 'are attached to the valve plate 3 . Between the chamber housing 2 and the valve plate 3 , two O-rings 20 , 21 are arranged, by means of which the outlet chamber 6 and the inlet chamber 8 or the outlet valve 10 and the inlet valves 11 , 11 'are sealed against one another. The valve plate 3 is provided with several, corresponding to the number of inlet valves 11 , 11 ', and the opposite pump chambers 22 , 22 ', in which pump membranes 23 , 23 'are axially movable, which consist of elastic material and via piston-like pump elements 24 , 24 'with a swash plate 26 arranged in a drive chamber 25 of the drive housing 4 are connected. The pump diaphragms 23 , 23 'are provided with annular gaskets 27 , 27 ' and are clamped between the valve plate 3 and the drive housing 4 such that the pump chambers 22 , 22 'are sealed off from the drive chamber 25 . The swash plate 26 is rotatably mounted on a bearing journal 28 of a drive shaft 29 , the axis 30 of which is inclined relative to the axis of rotation 31 of the drive shaft 29 and cuts it at a slight distance 32 from a neutral plane 33 of the pump diaphragms 23 , 23 '. The drive shaft 29 is rotatably mounted in a central bore 34 of the bearing housing 5 and has a shaft stub 35 projecting from the bearing housing 5 for coupling to a drive motor.

By a rotation 36 of the drive shaft 29 about the axis of rotation 31 , the swash plate 26 is set in a circumferential wobble movement due to the inclination of the Lagerzap fens 28 without co-rotating with the drive shaft 29 . The small distance 32 of the intersection 37 of the axis 30 of the journal 28 with the axis of rotation 31 of the drive shaft 29 from the neutral plane 33 of the pump membranes 23 , 23 'ensures that the radial movement of the pump membranes 23 , 23 ' and thus their loading and wear is relatively low. Due to the wobble movement of the swash plate 26 , the pump diaphragms 23 , 23 'and the pump elements 24 , 24 ' are put into a periodic axial pumping movement, by means of which, in the pumping chambers 22 , 22 ', alternately in the intake cycle by a movement in the direction of the drive chamber 25, vacuum and Ejection stroke is generated by a movement in the direction of the chamber housing 2 overpressure. In the Ab formation of Fig. 1, the drive shaft 29 and the swash are disc shown in a position 26, the top pumping element 24 is in the in the Ausstoßtotpunkt at the end of Ausstoßtak tes, so that in the upper pumping chamber prevails 22 overpressure. Correspondingly, the lower pump element 24 'is located in the suction dead center at the end of the suction cycle, so that there is negative pressure in the lower pump chamber 24 '. Due to the respective downstream arrangement of the valve membranes 13 , 17 , 17 ', the inlet valves 11 , 11 ' open and the corresponding part of the outlet valve 10 closes automatically when there is negative pressure in the associated pump chamber 22 , 22 '. Correspondingly, in FIG. 1 the lower inlet valve 11 'is opened and the lower part 38 of the outlet valve 10 is closed, so that the pump medium is conveyed through the inlet pipe 9 and out of the inlet chamber 8 into the lower pump chamber 22 '. In the event of overpressure in the pump chamber 22 , 22 ', the inlet valves 11 , 11 ' assigned to it close and the corresponding part of the outlet valve 10 opens automatically. Accordingly, the upper inlet valve 11 is closed in FIG. 1 and the upper part 39 of the outlet valve 10 is shown open, so that the pump medium is conveyed out of the upper pump chamber 22 through the outlet chamber 6 to the outlet pipe 7 .

According to the invention, the outlet valve 10 , which is designed as a plate membrane valve, is provided with a hold-down device 14 , which in the present case is integrated in the plate membrane 13 and by which it is held on the valve plate 3 and an upstream, ie radially inner lifting of the plate membrane 13 from the valve plate 3 and an associated deposition of pump medium in the corresponding intermediate space is prevented. For this purpose, the hold-down device 14 covers the valve channels 12 radially on the inside slightly and is axially shaped in accordance with the radial bending line of the open plate membrane 13 . In a similar manner, the inlet valves 11 , 11 ', which are also designed as tel lembrane valves, are each provided with an integrated hold-down device 18 , 18 ', by which the relevant diaphragm 17 , 17 'is held on the valve plate 3 and a deposit of pump medium is prevented therebetween. The hold-down devices 18 , 18 'partially cover the valve channels 16 , 16 ' radially on the inside and are in turn axially withdrawn in accordance with the radial bending line of the open plate membranes 17 , 17 '. Since a blind hole 40 , 40 'with an internal thread is provided for the screw bolts 19 , 19 ' for fastening the plate membranes 17 , 17 'and the hold-down device 18 , 18 ' on the valve plate 3 , unevenness in the inlet chamber 8 , the z. B. formed by holes or protruding bolts who could avoid. The precautions according to the invention prevent deposits of the pumping medium within the diaphragm pump 1 to a large extent, so that any cleaning of the pump 1 that may be required is possible without disassembly and can be accomplished solely by promoting a cleaning solution.

For a more detailed explanation of the structure of the diaphragm pump 1 of the invention, the valve plate 3 in Fig. 2a and Fig. 2b shown as an individual part in Fig. 2 view in an axial plane II-A II-A and in Fig. 2b in a radial cross section II-B-II-B. The valve plate 3 has four pump chambers 22 distributed uniformly over the circumference, which are surrounded on the drive side 41 by annular grooves 42 , which are provided for receiving the annular sealing beads 27 of the pump membranes 23 . A valve bed 44 with a central fastening bore 45 for receiving and fastening the plate membrane 13 and the hold-down device 14 of the outlet valve 10 is arranged centrally on the chamber side 43 . To connect the pump chambers 22 to the outlet chamber 6 , five largely circular circular valve channels 12 are provided. In the pumping chambers 22 there is in each case a valve bed 46 with egg ner central threaded bore 47 for receiving and fastening the respectively associated valve diaphragm 17 and the hold-down 18 of the inlet valves 11 , the threaded bores 47 being designed as blind holes 40 to prevent unevenness in the inlet chamber 8 are. Between the pumping chambers 22 and the inlet chamber 8 , a plurality of circular valve channels 16 of the inlet valves 11, which are circularly arranged at two radial distances, are each arranged. Chamber-side 43 two ring grooves 48 , 49 can be seen , which serve to receive the two O-rings 20 , 21 , by means of which the outlet chamber 6 and the inlet chamber 8 or the outlet valve 10 and the inlet valves 11 are sealed against one another. To avoid an undesirable heat conduction between the pumping medium and the drive chamber 25 , the valve plate 3 advantageously consists of egg nem thermally insulating material and can, for. B. made of peek.

As an example of an advantageous embodiment of an outlet valve 10 are in Fig. 3a in an axial plan view III-A-III-A and in Fig. 3b in a radial sectional view III-B-III-B a valve membrane 50 , a hold-down 51 and a central mounting bolt 52 shown. The hold-down device 51 is designed as a circular disk and is firmly connected to the fastening bolt 52 . Since the hold-down 51 is completely surrounded by the material of the valve membrane 50 designed as a plate membrane, for. B. is vulcanized into the valve membrane 50 when rubber is used as the membrane material, the three parts 50 , 51 , 52 form a single integrated membrane component 53 . To improve the functionality, ie the better separation of closed and open loading areas and the increase in flexibility, the valve membrane 50 is divided into angle sectors 55 by means of radial recesses 54 . An increase in flexibility by adapting to the bending line of the open valve membrane 50 serves a ra dial outside 56 tapered contour 57 of the hold-down device 51 . A further radial penetration of pump medium between the valve membrane 50 and the valve plate 3 is reliably prevented by an annular sealing bead 58 .

As an example of a preferred embodiment of an inlet valve 11 are in Fig. 4a in an axial plan view IV-A-IV-A and in Fig. 4b in a radial sectional view IV-B-IV-B a valve diaphragm 59 , a hold-down 60 and a central fastening bolt 61 is shown. The hold-down 60 is designed as a circular disk, firmly connected to the fastening bolt 61 , and completely surrounded by the material of the valve membrane 59 designed as a plate membrane, ie the three parts 59 , 60 , 61 are formed in one piece. In order to increase the flexibility by adapting to the bending line of the open valve membrane 59 , the hold-down device 60 has a contour 63 which is tapered radially on the outside 62.

To illustrate the difference of a diaphragm valve according to the invention compared to a conventional diaphragm valve is in Fig. 5a to 5c as a section of a diaphragm pump ei ne valve plate 64 with a conventional inlet membrane valve 65 and a conventional outlet membrane valve 66 in the rest position ( Fig. 5a), during the intake stroke ( Fig. 5b), and during the ejection stroke ( Fig. 5c) shown in a cross-sectional sketch. The inlet diaphragm valve 65 is designed as a plate diaphragm valve and has a plate diaphragm 67 made of elastic material with a central fastening 68 , through which a valve valve channel 69 located in the valve plate 64 can be opened or closed automatically depending on the effective pressure in an associated pump chamber 70 , Similarly, the Auslassmembranven valve 66 is designed as a diaphragm valve and has a Tel lermembran 71 , which is fixed by a mounting plate 72 on the valve plate 64 , and through which a Auslassven valve channel 73 can be opened or closed accordingly. In the intake stroke ( FIG. 5b), the plate diaphragm 67 of the inlet diaphragm valve 64 opens automatically due to a negative pressure p- in the associated pump chamber 70 and pump medium is sucked into the pump chamber 70 (see flow arrow 74 ). The plate membrane 67 also stands out in the area A downstream of the main flow direction 74 and in the area B on the diametrically opposite side of the inlet valve channel 69 from the valve plate 64 , so that pump medium can penetrate into the resulting interstices in a dead water flow in the subsequent closing process by re-applying the plate membrane 67 to the Ven tilplatte 64 is not completely pushed out, but is clamped between these components 64 , 67 . The same applies to the outlet diaphragm valve 66 , in which the plate diaphragm 71 opens automatically in the ejection cycle ( FIG. 5c) due to an overpressure p + in the pump chamber 70 and pump medium is pressed out of the pump chamber 70 (see flow arrow 75 ). The plate diaphragm 71 also stands out in the region C downstream of the main flow direction 75 from the valve plate 64 , so that pump medium can penetrate here, which is partially closed during the subsequent closing process.

In contrast to this, the inlet diaphragm valve 65 'and the outlet diaphragm valve 66 ' according to FIGS. 6a to 6c are each provided according to the invention with a hold-down 76 , 77 , by means of which the plate diaphragm 67 of the inlet diaphragm valve 65 'and the plate diaphragm 71 of the outlet diaphragm valve 66 ' on the valve plate 64 are attached. The hold-downs 76 , 77 are formed like a disk, extend in the channel sector 78 , 79 to the radially inner edge 80 , 81 of the valve channels 69 , 73 and partially cover them, but are axially corresponding to the bending line of the elastic plate membranes 67 , 71 withdrawn in order to hinder the flow through the diaphragm valves 65 ', 66 ' as little as possible. In a channel-free sector 82 , 83 , the hold-down devices 76 , 77 completely cover the plate membranes 67 , 71 . With such a configuration of the diaphragm valves 65 ', 66 ', lifting of the valve diaphragms 67 , 71 in the areas A, B, and C is effectively prevented, so that deposits between the plate diaphragms 67 , 71 and the valve plate 64 no longer occur can, and a cleaning of the membrane pump in question can be done solely by the promotion of a cleaning solution.

To explain its structure, a plate diaphragm valve 84 is shown in FIGS . 7a and 7b in a downstream top view ( FIG. 7a) and in a sectional view ( FIG. 7b) according to section VII-B-VII-B according to FIG. 7a, each in the closed position Condition, shown. A cut-out valve plate 85 has in a channel sector 86 two round valve channels 87 and four sectorally designed valve channels 88 , which are shown side by side for illustration in FIG. 7a, whereas usually only one form of the valve channels 87 , 88 is used in a diaphragm valve becomes. A plate membrane 89 , which is hatched vertically with the exception of the valve channels 87 , 88 , covers the channel sector 86 and a channel-free sector 90 and is fastened centrally on the valve plate 85 with a screw 91 . A disc-shaped hold-down 92 , which is hatched horizontally in Fig. 7a, completely covers the Tel lermembran 89 in the channel-free sector 90 and extends in the channel sector 86 to the radially inner edges 93 , 94 of the valve channels 87 , 88 or covers them slight. This effectively prevents the diaphragm 89 from lifting off from the valve plate 85 in the channel-free sector 90 and in the channel sector 86 radially within the valve channels 87 , 88 .

In order to clarify the structure and function is shown in Figs. 8a and 8b is a slit diaphragm valve 95 in a downstream side plan view (Fig. 8a) in the closed state and in a sectional view (Fig. 8b) according to section VIII-B-VIII-B shown in FIG. 8a in the open state. A sectioned valve plate 96 has in the area of the slit diaphragm valve 95 four circularly evenly arranged round valve channels 97 , over which a slit membrane 98 is arranged with two cross-shaped slots 99, which is fastened by an annular holder 100 on the valve plate 96 is. The hold-down device 100 extends up to the radially outer edge 101 of the slot membrane 98 , partially covers the valve channels 97 radially outside 102, and is shaped in this area in accordance with the bending line of the elastic slot membrane 98 . The hold-down device 100 designed in this way effectively prevents the slit diaphragm 98 from being lifted off the valve plate 96 without throttling the flow through the valve channels 97 when the slit diaphragm valve 95 is open (see FIG. 8b).

LIST OF REFERENCE NUMBERS

1

diaphragm pump

2

chamber housing

3

valve plate

4

drive housing

5

bearing housing

6

outlet

7

outlet pipe

8th

inlet chamber

9

inlet pipe

10

Exhaust valve, diaphragm valve

11

(upper) inlet valve, diaphragm valve

11

'(lower) inlet valve, diaphragm valve

12

valve channel

13

Valve diaphragm, plate diaphragm

14

down device

15

bolt

16

(upper) valve channel

16

'(lower) valve channel

17

(upper) valve membrane, plate membrane

17

'(lower) valve membrane, plate membrane

18

(upper) hold-down device

18

'(lower) hold-down device

19

bolt

19

'' Bolt

20

O-ring

21

O-ring

22

(upper) pump chamber

22

'(lower) pumping chamber

23

(upper) pump membrane

23

'(lower) pump membrane

24

(upper) pump element

24

'(lower) pump element

25

drive chamber

26

swash plate

27

(upper) sealing bead

27

'(lower) sealing bead

28

pivot

29

drive shaft

30

axis

31

axis of rotation

32

distance

33

neutral plane

34

central bore

35

stub shaft

36

rotation

37

intersection

38

lower part

39

upper part

40

(top) blind hole

40

'(lower) blind hole

41

drive side

42

ring groove

43

chamber side

44

valve bed

45

mounting hole

46

valve bed

47

threaded hole

48

ring groove

49

ring groove

50

Valve diaphragm, plate diaphragm

51

down device

52

mounting bolts

53

membrane component

54

recess

55

angular sector

56

radially outside

57

tapered contour

58

sealing bead

59

Valve diaphragm, plate diaphragm

60

down device

61

mounting bolts

62

radially outside

63

tapered contour

64

valve plate

65

Inlet diaphragm valve

65

'' Inlet diaphragm valve

66

Auslassmembranventil

66

'' Outlet diaphragm valve

67

valve membrane

68

central attachment

69

Inlet valve channel

70

pumping chamber

71

valve membrane

72

mounting disk

73

Auslassventilkanal

74

Flow arrow, flow direction

75

Flow arrow, flow direction

76

down device

77

down device

78

channel sector

79

channel sector

80

edge

81

edge

82

channel-free sector

83

channel-free sector

84

Plate diaphragm valve

85

valve plate

86

channel sector

87

(round) valve channel

88

(sectoral) valve channel

89

Valve diaphragm, plate diaphragm

90

channel-free sector

91

screw

92

down device

93

inner edge

94

inner edge

95

Slit diaphragm valve

96

valve plate

97

valve channel

98

slit diaphragm

99

slot

100

down device

101

outer edge

102

radially outside
A area
B area
C area
p- negative pressure
p + overpressure

Claims (20)

1.Diaphragm pump, with a plurality of pumping chambers, each of which is sealed with a pumping membrane against a drive chamber, the respective pumping membrane being connected via an associated pump element to a swashplate arranged in the drive chamber and by a wobble movement of the swashplate into one periodic axial pump movement is displaceable, the pump chambers can be connected in a pressure-dependent manner via inlet valves to an inlet chamber and via an outlet valve to an outlet chamber, and at least one of the valves is designed as a diaphragm valve with a plurality of valve channels arranged in a valve plate and closable by a valve membrane, characterized in that the diaphragm valve ( 10 , 11 , 11 ') has a hold-down device ( 14 , 18 , 18 ') to prevent the valve diaphragm ( 13 , 17 , 17 ') from lifting off from the valve plate ( 3 ). 2. Diaphragm pump according to claim 1, characterized in that the diaphragm valve ( 10 , 11 , 11 ') arranged in a circular manner Ven tilkanäle ( 12 , 16 , 16 ') and as a valve diaphragm ran a Tellermemb ( 13 , 17 , 17 ') with central attachment and that the hold-down device ( 14 , 18 , 18 ') is designed as a circular disk which is arranged radially within the valve channels ( 12 , 16 , 16 '). 3. Diaphragm pump according to claim 2, characterized in that the plate membrane ( 13 ) for functional improvement by means of radial recesses ( 54 ) is divided into angle sectors ( 55 ). 4. Diaphragm pump according to claim 1, characterized in that the diaphragm valve ( 95 ) has circularly arranged valve channels ( 97 ) and as a valve diaphragm a slot diaphragm ( 98 ) with peripheral fastening, and that the hold-down device ( 100 ) as an annular and radially outside of the valve channels ( 97 ) is formed on an ordered disc. 5. Diaphragm pump according to one of claims 2 to 4, characterized in that the valve membrane ( 50 ) has a ring-shaped sealing bead ( 58 ) at the central fastening and radially on the outside and at the peripheral fastening. 6. Diaphragm pump according to one of claims 2 to 5, characterized in that the hold-down device ( 14 , 18 , 18 ') partially covers the valve channels ( 12 , 16 , 16 ') radially. 7. Diaphragm pump according to claim 6, characterized in that the hold-down device ( 14 , 18 , 18 ') in the overlap region of the Ven tilkanäle ( 12 , 16 , 16 ') corresponding to the radial bending line of the open valve membrane ( 13 , 17 , 17 ') axially withdrawn is formed. 8. Diaphragm pump according to one of claims 2 to 7, characterized in that the hold-down device ( 92 ) in an arrangement of the valve channels ( 87 , 88 ) in a partial circle sector completely covers the valve membrane ( 89 ) in the channel-free sector ( 90 ) , 9. Diaphragm pump according to one of claims 2 to 8, characterized in that the holding-down device ( 14 , 18 , 18 ') and a fastening element ( 15 , 19 , 19 ') are formed in one piece. 10. Diaphragm pump according to one of claims 2 to 9, characterized in that the hold-down device ( 14 , 18 , 18 ') and the Ven tilmembran ( 13 , 17 , 17 ') are integrally formed. 11. Diaphragm pump according to claim 10, characterized in that the holding-down device ( 14 , 18 , 18 ') is embedded in the valve membrane ( 13 , 17 , 17 '). 12. Diaphragm pump according to one of claims 9 to 11, characterized in that the hold-down device ( 14 , 18 , 18 '), the fastening element ( 15 , 19 , 19 ') and the valve membrane ( 13 , 17 , 17 ') are formed in one piece , 13. Diaphragm pump according to one of claims 1 to 12, characterized in that the hold-down device ( 18 , 18 ') of a plurality of diaphragm valves ( 11 , 11 ') are combined in one component. 14. Diaphragm pump according to one of claims 1 to 13, characterized in that the valve channels ( 12 , 16 , 16 ') each have a rounded inlet contour on the input side. 15. Diaphragm pump according to one of claims 1 to 14, characterized in that when using sectorally designed valve channels ( 88 ), the radial webs between the valve channels ( 88 ) are designed to be tapered on the outlet side. 16. Diaphragm pump according to one of claims 1 to 15, characterized in that the pumping chambers ( 22 , 22 ') and the drive chamber ( 25 ) are thermally insulated from one another. 17. Diaphragm pump according to claim 16, characterized in that the valve plate ( 3 ) consists of a thermally insulating material Ma. 18. Diaphragm pump according to claim 17, characterized in that Peek is used as the material of the valve plate ( 3 ). 19. Diaphragm pump according to one of claims 1 to 18, characterized in that the pump membranes ( 23 , 23 ') and / or the valve membranes ( 17 , 17 ') can be mounted on one side from the pumping chambers ( 22 , 22 '). 20. Diaphragm pump according to one of claims 1 to 19, characterized in that a safety seal is provided between the pump membranes ( 23 , 23 ') and the drive chamber ( 25 ).