Diaphragm type vacuum pump

Abstract

The utility model relates to a modularly designed diaphragm vacuum pump. The diaphragm vacuum pump is provided with: an electric drive device; a crank transmission mechanism; a pump body; a pump arrangement having at least one pump unit arranged at the pump body; and an inlet and at least one outlet. The drive device has a motor that defines a longitudinal axis with the crank drive mechanism. The motor is arranged at the pump body along the longitudinal axis. Each pump unit has a pump chamber, a valve at the fluid inlet and a further valve at the fluid outlet, and a suction line connected to the fluid inlet and a pressure line connected to the fluid outlet, each leading to the pump chamber. A diaphragm is arranged at each pump chamber, said diaphragm being driven by a crank drive such that the pump chambers are alternately enlarged and reduced. The inlet is connected to the at least one pump chamber via its suction line and the outlet is connected to the at least one pump chamber via its pressure line.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, in particular to a modularly constructed diaphragm vacuum pump having the characteristics of the disclosed content. Background Art

[0002] Oscillating positive displacement vacuum pumps are known from the standard DIN 28400, part 2. These are vacuum pumps in which a pump chamber is periodically separated from an inlet and gas is conveyed to an outlet via a wall that moves back and forth while the volume of the pump chamber changes. A diaphragm vacuum pump is an embodiment of such a vacuum pump.

[0003] Diaphragm vacuum pumps are known from the prior art DE 102006021535 B3 and CN 218207018 U. In this type of pump, the pump chamber of the pump unit is periodically reduced and expanded by a vibrating element, such as a diaphragm. When the pump chamber is expanded, the medium, gas or steam to be transported is sucked into the pump chamber through at least one inlet at the pump unit. When the pump chamber is reduced, the medium is compressed in the pump chamber and discharged through at least one outlet at the pump unit.

[0004] The diaphragm vacuum pump has one or more pump stages. A multistage diaphragm vacuum pump has a plurality of pump units, and at least one pump chamber of a first pump stage is connected with its outlet to the inlet of at least one pump chamber of a second pump stage. This arrangement of the pump stages of a multistage diaphragm vacuum pump results in a lower end pressure. As the number of pump chambers per pump stage increases, the suction capacity increases.

[0005] A multi-stage diaphragm vacuum pump having a plurality of pump chambers is known from US 2004197201 A1 or WO 2009068180 A1.

[0006] Multi-stage diaphragm vacuum pumps are of complex construction and their pump units are driven by a central crank mechanism. The pump units are arranged opposite the crank mechanism and, if necessary, along it. Utility Model Content

[0007] Starting from the prior art mentioned at the outset, the object of the present invention is to describe a multi-stage diaphragm vacuum pump which is improved in structure and which is also intended to achieve a diaphragm vacuum pump which is more cost-effective to manufacture.

[0008] This object is achieved by a diaphragm vacuum pump of the type mentioned at the outset having the features of the disclosure. Preferred embodiments and improvements are the subject matter of the disclosure.

[0009] According to the utility model, a diaphragm vacuum pump is provided with: an electric drive device; a crank transmission mechanism; a pump body; a pump arrangement structure having at least one pump unit arranged at the pump body; and an inlet and at least one outlet. The drive device has a motor, which defines a longitudinal axis with the crank transmission mechanism. The motor is arranged at the pump body along the longitudinal axis. Each pump unit has a pump chamber, a valve at the fluid inlet and another valve at the fluid outlet, and a suction line connected to the fluid inlet and a pressure line connected to the fluid outlet, which are respectively led to the pump chamber. A diaphragm is arranged at each pump chamber, which causes the pump chamber to alternately increase and decrease in size in a manner driven by the crank transmission mechanism, wherein the inlet is connected to at least one pump chamber through its suction line, and the outlet is connected to at least one pump chamber through its pressure line. The pump arrangement is arranged at a layout plane perpendicular to the longitudinal axis of the drive device, and the two pump units of the pump arrangement are arranged in the layout plane in a uniformly distributed manner around the longitudinal axis of the drive device, wherein their crank drives each have a lower bearing with a bearing plane, and wherein the bearing planes are arranged opposite each other along the longitudinal axis and at the same bearing distance relative to the layout plane of the pump arrangement. The pump arrangement can then have pump units that are identical. A modular structure of the diaphragm vacuum pump can then be achieved using identical components, thereby making it possible to manufacture and assemble the diaphragm vacuum pump more cost-effectively.

[0010] According to a preferred embodiment, the pump body of the diaphragm vacuum pump has a plurality of pump arrangements, each having a further arrangement plane and each having two further pump units, which are offset along the longitudinal axis and are each twisted around the longitudinal axis by an amplitude equal to the quotient of 360° and the number of arrangement planes.

[0011] A particularly compact design of the diaphragm vacuum pump is achieved if the pump arrangements of the first and second or further arrangement plane are arranged adjacent to one another along the longitudinal axis.

[0012] According to another preferred embodiment of the diaphragm vacuum pump, the pump body has a motor bearing flange and a housing bearing flange that is offset and opposite along the longitudinal axis. The motor bearing flange and the housing bearing flange each carry a ball bearing that supports the crank drive. The motor is preferably fastened to the motor bearing flange.

[0013] Particularly preferably, the rotary bearing of the crank mechanism has an elastic spring element which is arranged between a ball bearing of the housing bearing flange and an adjacent bearing of the bearing plane of the pump unit and acts on the crank mechanism. The spring element presses the bearing of the bearing plane on the crank mechanism in the direction of the longitudinal axis without play against the ball bearing of the motor bearing flange and enables quiet operation of the diaphragm vacuum pump.

[0014] According to a preferred embodiment of the diaphragm vacuum pump, the suction lines of at least two pump units are connected to the inlet to form a first pumping stage and their pressure lines are connected to the fluid inlet of at least one further pump unit to form a second pumping stage.

[0015] A preferred aspect of the utility model that can also be realized independently relates to a diaphragm vacuum pump, which arranges a second pump arrangement structure having at least two pump units in a plane of the second pump arrangement structure perpendicular to the longitudinal axis of the electric drive. Alternatively, the diaphragm vacuum pump has a first or second pump arrangement structure with at least four pump units in a plane perpendicular to the longitudinal axis of the electric drive, and these pump units are preferably arranged in a star shape around the longitudinal axis. Another alternative diaphragm vacuum pump has a plurality of pump arrangements, which have a plurality of pump units evenly distributed around the longitudinal axis of the electric drive. These alternative embodiments of the diaphragm vacuum pump according to the utility model also have a compact structure.

[0016] Another aspect of the utility model, which can also be realized independently, relates to a diaphragm vacuum pump, which fastens a multi-part housing to a pump body. In a special design, the housing spans the pump unit at the top and laterally. The pump body and the drive are thus protected from touching the operator. The lower side of the housing for placing the pump in the area of ​​the pump body remains open and easily accessible to the operator.

[0017] Advantageously, the housing has a side cover, an inlet cover and a fan cover and thus forms a compact, easily assembled and disassembled pump. Preferably, the side cover is multi-piece and consists of a side cover on the left side and a side cover on the right side with respect to the longitudinal axis.

[0018] In a particular manner, the diaphragm vacuum pump can be cooled by the arrangement of the side covers, since the side covers are arranged at a distance from the pump body and / or the pump housing in such a way that a gap is formed. The air flow can then be effectively cooled by being guided under the side covers. In particular, after operation of the diaphragm vacuum pump, the cooling can be achieved by the open side covers that are not spanned at the bottom in the region of the pump body, wherein the air escapes through the inlet cover and the fan cover.

[0019] According to an advantageous design, a plurality of feet for placing the diaphragm vacuum pump are arranged at the side cover of the diaphragm vacuum pump. With this design, it is easy to remove the inlet cover or the fan cover for assembly, cleaning, maintenance or repair.

[0020] Another aspect of the utility model that can also be realized independently relates to a diaphragm vacuum pump, which has a first pump stage with a plurality of pump units and a second pump stage with at least one pump unit. An overflow valve is arranged between the pressure line and the outlet of the first pump stage, which is opened when the pressure in the pressure line is greater than the pressure at the outlet and is closed when the pressure in the pressure line is less than the pressure at the outlet. In a multi-stage diaphragm vacuum pump with an overflow valve, the pumping process is faster.

[0021] Further preferred embodiments of the diaphragm vacuum pump according to the present invention will be apparent from the following description in conjunction with the drawings and their description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Next, the present invention will be explained in more detail based on the accompanying drawings of preferred embodiments.

[0023] Figure 1 A diaphragm vacuum pump is shown in a perspective view, which is used to generate a vacuum and to convey gases.

[0024] Figure 2 Shows Figure 1 Rear view of the diaphragm vacuum pump,

[0025] Figure 3 Shows Figure 1 Another perspective view of the diaphragm vacuum pump,

[0026] Figure 4 Shows Figure 1 A perspective view of a diaphragm vacuum pump, wherein the housing is omitted.

[0027] Figure 5 Shows that according to Figure 4 Another perspective view of the diaphragm vacuum pump,

[0028] Figure 6 Shows that according to Figure 4 Another perspective view of a diaphragm vacuum pump, wherein other components are omitted,

[0029] FIG7 shows the Figure 2 A cross-sectional view of the line AA through the diaphragm vacuum pump,

[0030] FIG8 shows the Figure 2 A cross-sectional view of the line BB passing through the diaphragm vacuum pump,

[0031] Fig. 9 shows a side view of the pump unit,

[0032] Fig.10 Shows Fig. 9 A perspective view of the pump unit,

[0033] Fig.11 Shows Fig.10 A top view of the pump unit,

[0034] Fig.12 Shows the following Fig.11 A cross-sectional view of the line CC through the pump unit,

[0035] Fig.13 shows a perspective view of the head cover,

[0036] Fig.14 Shows Fig.13 Another perspective view of the head cover,

[0037] Fig.15 shows a perspective view of the valve head,

[0038] Fig.16 Shows the following Fig.12 A cross-sectional view of the line DD passing through the pump unit,

[0039] FIG. 17 shows a sectional view along the line CC through the diaphragm vacuum pump according to FIG. 7 , and

[0040] FIG. 18 shows a section along the line DD through the pump unit according to FIG. 17 . DETAILED DESCRIPTION

[0041] Figure 1 , Figure 2 and Figure 3 A diaphragm vacuum pump 1 is shown which conveys gas from an inlet 2 to an outlet 3. The diaphragm vacuum pump 1 also has a gas ballast valve 4 which will be explained later. Figures 1 to 3 The diaphragm vacuum pump 1 shown in the figure further comprises a housing which is advantageously formed by left and right side covers 5, 6, which are designed in two parts here, as well as an inlet cover 7 surrounding the inlet 2 and a fan cover 8 oppositely closing the side covers 5, 6. The diaphragm vacuum pump 1 is placed on a plurality of feet 9.

[0042] Figure 2 The rear side of the diaphragm vacuum pump 1 is shown with a connection unit 10. The connection unit 10 has at least one on / off switch, a fuse and a socket for the power supply.

[0043] Figure 3 The underside of the diaphragm vacuum pump 1 is shown, which has feet 9 arranged on the side covers 5, 6. Each side cover 5, 6 can also be Figure 1 There is a handle on the upper side shown in FIG. Figures 1 to 3As in the embodiment shown in FIG. 7 , the inlet cover 7 and the fan cover 8 each have a handle at the upper side.

[0044] The side covers 5, 6 are open at the bottom and allow air circulation to the inlet cover 7 and the fan cover 8 provided with openings for cooling during and in particular after operation of the diaphragm vacuum pump 1. The diaphragm vacuum pump 1 has a pump body 11 and control electronics 12, which are at least partially accessible at the open bottom of the side covers 5, 6 and are therefore cooled. The housing mentioned at the beginning with the side covers 5, 6, the inlet cover 7 and the fan cover 8 surrounds the pump body 11 on all sides except the bottom.

[0045] 7 and 8 show the spacing that exists between parts of the pump body 11 and the side covers 5 , 6 . The housing serves as a contact protection and for guiding air around the pump body 11 during cooling.

[0046] The side covers 5, 6 are detachably fastened to the pump housing 13 of the diaphragm vacuum pump 1 or the pump body 11 by means of screws 14. The feet 9 then support the pump housing 13 of the diaphragm vacuum pump 1 placed on the ground on the side covers 5, 6.

[0047] Figure 4 and 5 The diaphragm vacuum pump 1 is shown without a housing. Figure 4 The control electronics 12 are shown in an open position. Figure 4 and Figure 5 The pump housing 13 shown in the drawing is further composed of a motor support flange 15 and a housing support flange 16. The fan cover 8 is arranged on the motor support flange 15 and an electric drive 17 having a motor is fastened thereto. In order to cool the drive 17 and the pump unit 23 of the pump body 11 during operation of the diaphragm vacuum pump 1, the drive 17 has a fan impeller, which draws cooling air through the opening in the fan cover 8, the cooling air flows around the pump body 11 within the housing and flows out at the housing open at the bottom and at the opening in the inlet cover 7.

[0048] The inlet 2, outlet 3 and gas ballast valve 4 are fastened to the housing support flange 16. Figure 4 The control electronics 12 shown in FIG. 1 is composed at least of a power supply 18, a connection unit 10 and a frequency converter 19, which is used to control the speed of the drive 17. Figure 5 The housing support flange 16 shown in FIG. 1 carries a bracket 20 which fastens the inlet cover 7 to the pump housing 13 .

[0049] exist Figure 61 shows a pump body 11 without a pump housing 13 and having a plurality of pump arrangements 21. A crank drive 22 assigned to the pump arrangement 21 is connected to the motor of the drive device 17 in a rotationally fixed manner and defines a longitudinal axis L with the motor. The pump arrangement 21 is Figure 6 The preferred embodiment shown in FIG. 1 has four pump units 23 each, which are arranged uniformly, here in a star shape, around the longitudinal axis L. The number of pump units 23 per pump arrangement 21 is not important; only the uniform arrangement around the longitudinal axis L ensures low-vibration operation of the diaphragm vacuum pump 1. At least one pump arrangement 21 has at least two pump units 23 arranged opposite each other.

[0050] The cross-sectional view in FIG. 7 is a diaphragm vacuum pump 1 in FIG. Figure 2 , and shows a pump arrangement 21 according to the invention with its pump unit 23, crank mechanism 22 and its drive 17. The crank mechanism 22 has a bearing point with a ball bearing 24 in each of the motor bearing flange 15 and the housing bearing flange 16 for its rotational bearing structure and the radial forces acting on it caused by the pump unit.

[0051] Each pump unit 23 has an associated rolling bearing 25 as a rotary bearing, which is driven for the pumping movement by the rotational movement of the crank mechanism 22 and an eccentric 26 arranged on the crank mechanism 22. The rolling bearing 25 thus forms a bearing surface 27 for the respective pump unit 23.

[0052] The diaphragm vacuum pump 1 shown in FIGS. 7 and 8 has in the present embodiment four pump arrangements 21 which are each arranged perpendicularly to the longitudinal axis L of the drive 17 in an arrangement plane 28 , 28 ′, 28 ″ and 28 ′″.

[0053] The diaphragm vacuum pump 1 according to the present invention has two arranged pump units 23, and Figure 6 8 shows, for each pump arrangement 21, two pump units 23 arranged evenly distributed in their arrangement plane 28 about the longitudinal axis L of the drive device 17. The drive of the opposing pump units 23 takes place via the crank drive 22 on the corresponding bearing plane 27, wherein the bearing plane 27 is arranged opposite the arrangement plane 28 of the pump arrangement 21 along the longitudinal axis and at the same bearing distance 29 relative to the arrangement plane 28.

[0054] 7 to 9 show the pump unit 23 of the diaphragm vacuum pump 1 according to the present invention together with the connecting rod 30, which has a crank shape due to the bearing distance 29. The areas of the pump unit 23 that are far away from the longitudinal axis L are symmetrically located on the arrangement plane 28 and the rolling bearing 25 is located on the bearing plane 27. The pump units 23 of the pump arrangement 21 are identical, only twisted relative to each other and arranged oppositely. The pump unit 23 can be arranged continuously at each pump arrangement 21 at the diaphragm vacuum pump 1 according to the present invention. In addition, the symmetrical structure of the structurally identical pump units 23 within the arrangement plane 28 is conducive to the low-vibration operation of the diaphragm vacuum pump 1.

[0055] exist Figure 4 In the embodiment shown in FIG. 8 , the diaphragm vacuum pump 1 has a plurality of pump arrangements 21, 21′, 21″, 21″′, which have arrangement planes 28, 28′, 28″ and 28″′, respectively, one after the other and are offset relative to one another along the longitudinal axis L. Each further pump arrangement 21′, 21″, 21″′ has two pump units 23, respectively. Each further pump arrangement 21′, 21″, 21″′ is also arranged with respect to the first or preceding pump arrangement 21, in a manner twisted stepwise by an amplitude of the quotient of 360° and the number of arrangement planes 28 present.

[0056] The rotary bearings of the first and second or further flat-bearing pump units 23 are arranged adjacent to one another along the longitudinal axis L. Together with a pump arrangement designed in this way, the diaphragm vacuum pump 1 according to the invention forms a compact structure.

[0057] FIGS. 7 and 8 show the rotary bearing of the crank drive 22. Advantageously, a spring element 31 with a slip ring 32 is arranged between the housing bearing flange 16 and the adjacent rotary bearings 25, 26 of the pump unit 23. The spring element 31 and, if necessary, the spacing element 33 arranged on the crank drive 22 between the pump arrangement 21 ensure that there is no play in the axial direction of the longitudinal axis L of all rotary bearings 25, 26. Noise generation is reduced and low-vibration operation of the crank drive 22 and the pump unit 23 is achieved.

[0058] The pump unit 23 is Figures 10 to 12 3 and, in addition to the connecting rod 30, consists of a head cover 34, a diaphragm 35, a clamping disk 36 and a protective disk 37. The connecting rod 30 has a bearing seat 38 for receiving the rolling bearing 25.

[0059] The head cover 34 has a plurality of T-shaped slots 39 at its periphery for fastening various additional components. Fig.11In the embodiment shown in FIG, the head cover 34 is two-piece, has an insert 40, and can thus be made of different materials. In a preferred embodiment, the head cover 34 is made of aluminum, and the insert 40 is made of plastic, such as polyolefins (e.g. PP, PE), PA, PEEK, PPS or fluoropolymers, such as PTFE or PVDF, materials suitable for the use of the diaphragm vacuum pump 1. The clamping disk 36 is also made of two pieces.

[0060] In the embodiment shown, the clamping disk 36 is provided with a fastening device which serves for a permanently stable connection to the connecting rod 30. The membrane 35 is also held between the protective disk 37 and the clamping disk 36 by means of the fastening device.

[0061] A further design of a pump unit 23 and its arrangement on the pump housing 13 is known from the prior art DE 10 2006 021 535 B3. Reference is made to this design as an exemplary embodiment in the following text.

[0062] As in Figures 10 to 13 As shown in FIG. 1 , a retaining element 41 is provided on each pump unit 23 , which retaining element holds the valve group 42 on the suction side and the valve group 43 on the pressure side against the head cover 34 on its spiral dome 44 by means of a screw. Fig.13 and Fig.14 The head cover 34 shown in FIG. 1 further comprises valve seats 45, 46 which are formed relative to the membrane 35 and which lead to the fluid inlet 47 and the fluid outlet 48 via openings. Fig.12 In the pump chamber 49 shown in FIG. Fig.12 and Fig.15 As shown in FIG. 2 , a valve 50 is arranged on each of the valve seats 45 , 46 and is held between the valve blocks 42 , 43 and the head cover 34 .

[0063] The valve 50 closes the fluid inlet 47 at the valve block 42 on the suction side and closes the fluid outlet 48 at the valve seat 46 on the pressure side at the head cover 34 on the pressure side. By enlarging the pump chamber 49, the valve 50 opens the fluid inlet 47 and closes the valve seat 46 on the pressure side. When the pump chamber 49 is reduced, the valve 50 opens the fluid outlet 48 and closes the valve seat 45 on the suction side.

[0064] The suction-side valve block 42 has an opening 51 and the pressure-side valve block 43 has a further opening 52, which each lead to a hose connector 53. The openings 51, 52 of the valve blocks 42, 43 are each surrounded by a sealing surface 54 or the sealing surface 54 adjoins the openings 51, 52. The sealing surface serves to close the valve blocks 42, 43 in a gas-tight manner at the valve seats 45, 46 of the head cover 34 by means of the valve 50.

[0065] The diaphragm vacuum pump 1 according to the invention, together with its at least one pump arrangement 21, has a plurality of pump stages. Figure 4 and Figure 5 As shown, the inlet 2 is connected to two pump units 23 of a first pump arrangement 21 via a first intake line 55 and to a further pump unit 23 of a further pump arrangement 21 via a further intake line 55. The intake line 55 opens into the respective fluid inlet 47 of the pump unit 23. In this embodiment, the first pump stage has a total of six pump units 23 at a plurality of pump arrangements 21, which are connected to the inlet 2 by means of an intake line 55.

[0066] The further pump unit 23 of the further pump arrangement 21' is connected to the pressure line 57 of the first pump stage via a connecting line 56. The fluid outlet 48 of the pump unit 23 of the first pump stage is then connected to the fluid inlet 47 of the pump unit 23 of the second pump stage, as in Figure 4 As shown in .

[0067] The fluid outlet 48 of the pump unit 23 of the second pump stage is then connected via a second connecting line 56′ to the fluid inlet 47 of the pump unit 23 of the third pump stage and via a gas ballast line 58 to the gas ballast valve 4. Optionally, a settable lower volume flow from the ambient air can be supplied to the third pump stage by means of the gas ballast valve 4 in order to avoid condensation processes.

[0068] The fluid outlet 48 of the pump unit 23 of the third pump stage is connected to the outlet 3 via an outlet line 59 .

[0069] The diaphragm vacuum pump 1 according to the present invention has a line distributor 60 for the suction line 55, the pressure line 57 and the outlet line 59, respectively, separately from each other. In the embodiment shown, the line distributor 60 is arranged on the housing support flange 16. The line distributor 60 is arranged within the inlet cover 7 and has an inlet 2, which protrudes through the inlet cover 7.

[0070] In another embodiment of the diaphragm vacuum pump 1 according to the present invention, an overflow valve 61 is arranged between the first pump stage and the outlet 3. When the pressure in the pressure line 57 of the first pump stage is greater than the pressure at the outlet 3, the overflow valve 61 is opened. Compared with the pump units of the second pump stage, in the diaphragm vacuum pump 1 with more pump units 23 of the first pump stage, the suction capacity of the first pump stage is higher at the beginning of the pumping process, and the pump units 23 of the second or other pump stages act as resistance due to the high delivery flow. In order to speed up the pumping process, the overflow valve 61 is used to guide the high suction capacity of the pump units 23 of the first pump stage directly to the outlet 3 and not to the outlet 3 through the second or other pump stage. During the pumping process, once the pressure in the pressure line 57 is less than the pressure at the outlet 3, the pressure in the pressure line 57 drops and the overflow valve 61 is closed.

[0071] The diaphragm vacuum pump 1 according to the present invention can vary in terms of the number of pump units 23 and the pump stages in different pump arrangements 21. The structure of the diaphragm vacuum pump 1 according to the present invention enables various combinations of pump units 23, wherein the fluid inlet 47 and the fluid outlet 48 thereof can be connected to each other or can be connected to the inlet 2 and the outlet 3 individually or centrally via pipelines in order to optimally adapt the suction capacity, the working pressure and / or the end pressure to the usage scenario.

[0072] List of reference numerals:

[0073] 1 Diaphragm vacuum pump

[0074] 2 Entrance

[0075] 3. Exit

[0076] 4 Gas ballast valve

[0077] 5 Side cover, on the left side

[0078] 6 Side cover, on the right side

[0079] 7 Entrance Cover

[0080] 8 Fan cover

[0081] 9 feet

[0082] 10 Connection unit

[0083] 11 Pump body

[0084] 12 Control electronics

[0085] 13 Pump housing

[0086] 14 Screw

[0087] 15 Motor support flange

[0088] 16 Shell support flange

[0089] 17 Drive device

[0090] 18 Power supply

[0091] 19 Inverter

[0092] 20 Bracket

[0093] 21 Pump layout

[0094] 22 Crank drive mechanism

[0095] 23 Pump unit

[0096] 24 Ball bearings

[0097] 25 Rolling bearings

[0098] 26 Eccentric

[0099] 27 Support plane

[0100] 28 Layout Plan

[0101] 29 Support spacing

[0102] 30 Connecting rod

[0103] 31 Spring element

[0104] 32 Slip Ring

[0105] 33 Spacer element

[0106] 34 Head cover

[0107] 35 Diaphragm

[0108] 36 Compact disc

[0109] 37 Protective disc

[0110] 38 Bearing seat

[0111] 39 T-slot

[0112] 40 Inserts

[0113] 41 Retaining parts

[0114] 42 valve group, on the suction side

[0115] 43 valve group, on the pressure side

[0116] 44 Spiral Dome

[0117] 45 Valve seat, on the suction side

[0118] 46 Valve seat, on the pressure side

[0119] 47 Fluid inlet

[0120] 48 Fluid outlet

[0121] 49 Pump Room

[0122] 50 valve

[0123] 51 opening, on the suction side

[0124] 52 opening, on the pressure side

[0125] 53 Hose connector

[0126] 54 Sealing surface

[0127] 55 Suction line

[0128] 56 Connecting pipes

[0129] 57 Pressure line

[0130] 58 Gas ballast line

[0131] 59 outlet pipe

[0132] 60 Pipe distributor

[0133] 61 Relief valve

[0134] L Longitudinal axis.

Claims

1. A diaphragm vacuum pump (1), comprising: an electric drive device (17) having a motor, a crank mechanism (22), the crank mechanism and the motor defining a longitudinal axis (L), A pump body (11), wherein the motor is arranged at the pump body (11) along the longitudinal axis (L), A pump arrangement (21) having at least one pump unit (23), wherein each pump unit (23): - arranged on the pump body (11), - having a pump chamber (49), a valve (50) at the fluid inlet (47) and a further valve (50) at the fluid outlet (48), - having a suction line (55) connected to the fluid inlet (47) and a pressure line (57) connected to the fluid outlet (48), each leading to a pump chamber (49), - having a diaphragm (35) arranged in each case at the pump chamber (49), which diaphragm can be driven by the crank gear (22) and by means of which the pump chamber (49) can be alternately enlarged and reduced, an inlet (2) and at least one outlet (3), wherein the inlet (2) is connected to at least one pump chamber (49) via its suction line (55), and the outlet (3) is connected to at least one pump chamber (49) via its pressure line (57), It is characterized in that The pump arrangement (21) is arranged in an arrangement plane (28) perpendicular to the longitudinal axis (L) of the electric drive (17), The two pump units (23) of the pump arrangement (21) are arranged in an arrangement plane (28) distributed uniformly around the longitudinal axis (L) of the electric drive (17), wherein the crank drive (22) has a lower bearing with a bearing plane (27) for each pump unit (23), and wherein the bearing planes (27) are arranged opposite each other along the longitudinal axis (L) and at the same bearing distance (29) relative to the arrangement plane (28) of the pump arrangement (21), and All pump units (23) are identical.

2. The diaphragm vacuum pump (1) according to claim 1, characterized in that: The pump body (11) has a plurality of pump arrangements (21, 21', 21", 21"'), wherein each pump arrangement (21, 21', 21", 21"') has a further arrangement plane (28, 28', 28", 28"') and two further pump units (23), which are offset along the longitudinal axis (L) and twisted around the longitudinal axis (L) by an amplitude equal to the quotient of 360° and the number of arrangement planes (28).

3. The diaphragm vacuum pump (1) according to claim 2, characterized in that: The pump arrangements (21, 21', 21", 21'") of the arrangement plane and the further arrangement plane (28, 28', 28", 28'") are arranged adjacent to one another along the longitudinal axis (L).

4. The diaphragm vacuum pump (1) according to claim 1 or 2, characterized in that: The pump body (11) has a motor bearing flange (15) and a housing bearing flange (16) which is offset and opposite to each other along the longitudinal axis (L), wherein ball bearings (24) respectively support the crank mechanism (22) at the motor bearing flange (15) and the housing bearing flange (16), wherein the motor is fastened to the motor bearing flange (15).

5. The diaphragm vacuum pump (1) according to claim 4, characterized in that: An elastic spring element (31) acting on the crank mechanism (22) is arranged between the ball bearing (24) of the housing support flange (16) and the adjacent bearing of the support plane (27) of the pump unit (23), and presses the bearing of the support plane (27) on the crank mechanism (22) in the direction of the longitudinal axis (L) against the ball bearing (24) of the motor support flange (15) without play.

6. The diaphragm vacuum pump (1) according to claim 1 or 2, characterized in that: The suction lines (55) of at least two pump units (23) are connected to the inlet (2) to form a first pump stage, and their pressure lines (57) are connected to the fluid inlet (47) of at least one further pump unit (23) to form a second pump stage.

7. A diaphragm vacuum pump (1), comprising: an electric drive device (17) having a motor, a crank mechanism (22), the crank mechanism and the motor defining a longitudinal axis (L), A pump body (11), wherein the motor is arranged at the pump body (11) along the longitudinal axis (L), A first pump arrangement (21) having at least one pump unit (23), wherein each pump unit (23): - arranged on the pump body (11), - having a pump chamber (49), a valve (50) at the fluid inlet (47) and a further valve (50) at the fluid outlet (48), - having a suction line (55) connected to the fluid inlet (47) and a pressure line (57) connected to the fluid outlet (48), each leading to a pump chamber (49), - having a diaphragm (35) arranged in each case at the pump chamber (49), which diaphragm can be driven by the crank gear (22) and by means of which the pump chamber (49) can be alternately enlarged and reduced, an inlet (2) and at least one outlet (3), wherein the inlet (2) is connected to at least one pump chamber (49) via its suction line (55), and at least the outlet (3) is connected to at least one pump chamber (49) via its pressure line (57), It is characterized in that A second pump arrangement (21) having at least two pump units (23) is arranged in a plane of the second pump arrangement (21) perpendicular to a longitudinal axis (L) of the electric drive (17), or A second pump arrangement (21) having at least four pump units (23) is provided, and the first pump arrangement (21) and the second pump arrangement (21) are arranged in a plane perpendicular to a longitudinal axis (L) of the electric drive (17), or A plurality of pump arrangements (21) having a plurality of pump units (23) are provided, wherein the pump units (23) are arranged evenly distributed around a longitudinal axis (L) of the electric drive (17).

8. A diaphragm vacuum pump (1), comprising: an electric drive device (17) having a motor, a crank mechanism (22), the crank mechanism and the motor defining a longitudinal axis (L), A pump body (11), wherein the motor is arranged at the pump body (11) along the longitudinal axis (L), A pump arrangement (21) having at least one pump unit (23), wherein each pump unit (23): - arranged on the pump body (11), - having a pump chamber (49), a valve (50) at the fluid inlet (47) and a further valve (50) at the fluid outlet (48), - having a suction line (55) connected to the fluid inlet (47) and a pressure line (57) connected to the fluid outlet (48), each leading to a pump chamber (49), - having a diaphragm (35) arranged in each case at the pump chamber (49), which diaphragm can be driven by the crank gear (22) and by means of which the pump chamber (49) can be alternately enlarged and reduced, an inlet (2) and at least one outlet (3), wherein the inlet (2) is connected to at least one pump chamber (49) via its suction line (55), and at least the outlet (3) is connected to at least one pump chamber (49) via its pressure line (57), It is characterized in that A multi-part housing is fastened to the pump body (11), wherein the housing spans the pump unit (23) at the top and laterally.

9. The diaphragm vacuum pump (1) according to claim 8, characterized in that: The housing has a side cover, an inlet cover (7) and a fan cover (8).

10. The diaphragm vacuum pump (1) according to claim 9, characterized in that: The side cover is arranged at a distance from the pump body (11) and / or the pump housing (13) in such a way as to form a gap.

11. The diaphragm vacuum pump (1) according to claim 9 or 10, characterized in that: A plurality of supporting feet (9) are arranged on the side cover, and are used to place the diaphragm vacuum pump (1).

12. A diaphragm vacuum pump (1), comprising: an electric drive device (17) having a motor, a crank mechanism (22), the crank mechanism and the motor defining a longitudinal axis (L), A pump body (11), wherein the motor is arranged at the pump body (11) along the longitudinal axis (L), A pump arrangement (21) having at least one pump unit (23), wherein each pump unit (23): - arranged on the pump body (11), - having a pump chamber (49), a valve (50) at the fluid inlet (47) and a further valve (50) at the fluid outlet (48), - having a suction line (55) connected to the fluid inlet (47) and a pressure line (57) connected to the fluid outlet (48), each leading to a pump chamber (49), - having a diaphragm (35) arranged in each case at the pump chamber (49), which diaphragm can be driven by the crank gear (22) and by means of which the pump chamber (49) can be alternately enlarged and reduced, an inlet (2) and at least one outlet (3), wherein the inlet (2) is connected to at least one pump chamber (49) via its suction line (55), and at least the outlet (3) is connected to at least one pump chamber (49) via its pressure line (57), It is characterized in that A plurality of pump units (23) form a first pump stage and at least one pump unit (23) forms a second pump stage, wherein a pressure line (57) of the first pump stage is connected to a suction line (55) of the second pump stage, and An overflow valve (61) is arranged between the pressure line (57) of the first pump stage and the outlet (3), the overflow valve being designed to be opened when the pressure in the pressure line (57) is greater than the pressure at the outlet (3) and to be closed when the pressure in the pressure line (57) is lower than the pressure at the outlet (3).

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