Abstract
A diaphragm pump includes a pump head, a pump drive, a socket formed on the pump head configured to be releasably fixed to a mounting formed on the pump drive via a rotary closure, wherein the rotatory closure includes a securing device that includes a pushrod which is received in the mounting and is configured to be biased by a spring via a lever and engages in a positive-locking manner into a bore formed on the socket for locking.
Claims
1.-15. (canceled)
16. A diaphragm pump, comprising: a pump head; a pump drive; and a socket formed on the pump head configured to be releasably fixed to a mounting formed on the pump drive via a rotary closure, wherein the rotary closure includes a securing device that includes a pushrod which is received in the mounting and is configured to be biased by a spring via a lever and engages in a positive-locking manner into a bore formed on the socket for locking.
17. The diaphragm pump as claimed in claim 16, wherein the mounting includes at least two bayonet-like latching grooves and the socket includes at least two complementary latching lugs for engagement with the latching grooves, such that the latching lugs are configured to be releasably fixed to the latching grooves via a rotational movement after insertion into the mounting.
18. The diaphragm pump as claimed in claim 17, wherein the at least two latching grooves are arranged at a 180° angle to one another, and the at least two latching lugs are arranged at a 180° angle to one another.
19. The diaphragm pump as claimed in claim 17, wherein the mounting includes at least four of the latching grooves, and wherein the socket includes at least four of the latching lugs.
20. The diaphragm pump as claimed in claim 19, wherein the at least for latching grooves are arranged at a 90° angle to one another, and wherein the a least four latching lugs are arranged at a 90° angle to one another.
21. The diaphragm pump as claimed in claim 17, wherein the latching grooves are formed internally in the mounting and the latching lugs are formed externally on the socket.
22. The diaphragm pump as claimed in claim 17, wherein the at least two latching grooves include a transverse slot and a longitudinal slot on an inner wall of the mounting, wherein the transverse slot extends perpendicularly to the mounting circumference and is open on a socket side to receive the at least two latching lug and is obliquely flattened on one side in such that the at least two latching lug is configured to be guided into the longitudinal slot via an inclined surface.
23. The diaphragm pump as claimed in claim 17, wherein the at least two latching lugs are elongate and are rounded on at least one of the face sides of the at least two latching lugs to reduce the friction factor.
24. The diaphragm pump as claimed in claim 16, wherein a socket-side bore for the pushrod engagement is oriented with the pushrod in the mounting in an end position of the rotary closure.
25. The diaphragm pump as claimed in claim 16, wherein the pushrod is mounted in a first sleeve fastened in a vertical bore in the mounting and a second sleeve is provided in the first sleeve for accommodating the spring.
26. The diaphragm pump as claimed in claim 25, wherein the first sleeve for receiving the pushrod has an inclined ramp such that the pushrod is configured to be biased to a first position by rotation of the lever provided on the outer end of the pushrod, and is configured to be released to a second position by counter-rotation, wherein the biased pushrod engages into the bore of the socket when the bore is oriented with the pushrod.
27. The diaphragm pump as claimed in claim 26, wherein the lever includes a rotary vane.
28. The diaphragm pump as claimed in claim 26, wherein the counter-rotation is 180°.
29. The diaphragm pump as claimed in claim 26, wherein the inclined ramp is formed by an inclined cut on the first sleeve protruding from the mounting.
30. The diaphragm pump as claimed in claim 16, wherein the pushrod latches out of the socket-side bore after rotation of the lever by 180°, from the first position to the second position, so that the locking is released.
31. The diaphragm pump as claimed in claim 16, wherein the securing device is arranged on the mounting at a spaced interval between the at least two latching grooves close to one of the latching grooves of the at least two latching grooves.
32. The diaphragm pump as claimed in claim 16, wherein the bore is spaced between the at least two latching lugs, close to one of the latching lugs of the at least two latching lugs at an angle of 1° to 44°.
33. The diaphragm pump of claim 31, wherein the angle is 5° to 30°.
34. The diaphragm pump of claim 16, wherein the bore includes at least two socket-side bores are provided vertically in the socket.
35. The diaphragm pump of claim 34, wherein the bore includes at least four socket-side bores arranged at a 90° angle to one another provided vertically in the socket.
36. The diaphragm pump as claimed in claim 16, wherein the rotary closure includes a bayonet closure.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] A preferred exemplified embodiment of the invention will be described hereinafter with the aid of the purely schematic drawings. In the drawings,
[0026] FIG. 1 shows a perspective view of a pump, in particular a diaphragm pump, formed from a pump head and a pump drive;
[0027] FIG. 2 shows a further perspective view of the pump shown in FIG. 1;
[0028] FIG. 3A shows a cross-section through the mounting on the pump drive, in particular through the securing device which is formed on the mounting and in which the locking is released;
[0029] FIG. 3B shows an enlarged view of the securing device circled in FIG. 3A and marked by reference sign A;
[0030] FIG. 4A shows a cross-section through the mounting, as in FIG. 3A, but with the locking bolt or pushrod of the securing device in the locked position;
[0031] FIG. 4B shows an enlarged view of the securing device which is illustrated in FIG. 4A and is circled and marked by reference sign A; and
[0032] FIG. 5 shows a side view of the pump.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0033] FIG. 1 shows a pump 1, in particular a diaphragm pump, which is formed from a pump head 2 and a pump drive 3. The pump head 2 which can be releasably fastened to the pump drive 3 is shown in a position released from the drive. The cylindrical pump head housing 4 is open at the top with preferably a lateral housing wall 5 and a bottom or housing bottom 6 which preferably closes at the bottom, wherein in the embodiment shown, connections 7 on two sides, at least one inlet and one outlet, are arranged. The connections 7 on the housing wall 5 are expediently spaced apart at a 90° angle to one another. In this embodiment, a relief valve 8 is formed at the bottom 6 of the pump head housing 4 for reducing work-induced or system-induced excess pressures, is preferably hermetically connected to the pump head housing 4 and enables constant flow conditions. The housing wall 5 of the pump head housing 4 closes off at the top with a housing ring 9. The housing ring 9 is thus arranged at the upper end of the pump head 2, opposite the bottom 6 of the pump head housing 4. A socket 10 is arranged on tis ring, is likewise formed in an annular manner and has at least two latching lugs 11 and at least one bore 12 (socket-side bore) on its outer side. The socket-side bore 12 is formed close to one of the latching lugs 11, preferably in the extension of the longitudinal direction of the latching lug 11, and close to its rounded face-side end 13. Alternatively, the bore 12 may be slightly offset with respect to the longitudinal direction of the latching lug 11. A plurality of bores 12, e.g. two or particularly preferably four bores 12 or eight bores 12, can also be provided on the socket side, wherein each of the bores 12 is provided close to one of the latching lugs 11 and the at least two bores 12 are spaced apart at a 180° angle to one another, the at least four bores 12 are spaced apart at a 90° angle to one another.
[0034] In the present embodiment of the pump head 2, four latching lugs 11 are provided which are each arranged at a 90° angle to one another along the socket circumference. The elongated latching lugs 11 are rounded in this case both at a first transverse-side end and at a second transverse-side end 13. Alternatively, it is possible for the latching lugs 11 to be rectangular in shape at a first transverse-side end and are rounded at a second transverse-side end 13. Therefore, both transverse-side ends do not have to be rounded. Preferably, at least one transverse-side end is rounded, wherein in this case the rotational direction of the closure specifies the selection.
[0035] The pump drive is formed from a drive head (not shown here), a drive housing 14, a flange 15 provided at the bottom of the drive housing and a drive chamber housing 16 located downstream, wherein a mounting 17 with a securing device 18 and a closure arrangement 19 is provided on the underside of the drive chamber housing 16. The closure arrangement 19 is formed on an inner wall 20 of the mounting 17 in such a manner that the latching lugs 11 provided on the socket 10 can be inserted therein and the pump head 2 can be releasably fastened to the drive by means of a rotational movement. The purpose of the securing closure 18 is to ensure that the rotary closure cannot be released when the pump 1 is running.
[0036] FIG. 1 shows through the perspective view that the rotary closure for connecting the pump head 2 to the drive is formed from the socket-side latching lugs 11 of the pump head 2 and the slot-like receptacles 21, preferably latching grooves on the inner wall 20 of the mounting 17. The slot-like receptacles 21, preferably latching grooves, are configured in such a manner that a transverse slot 22 protrudes vertically from the bottom to the top on the inner wall 20 into the mounting 17, wherein the wall thickness in the region of the latching groove or slot region 21 is minimised compared to the normal wall thickness of the mounting 17 outside the slot region. In this case, the wall thickness in the slot region 21 is preferably minimised or set back by 0.4 mm to 6 mm, preferably between 1.0 mm and 4 mm, particularly preferably between 1.5 mm and 2 mm, compared to the normal wall thickness of the mounting 17. In a particularly preferred embodiment, the depth of the slot region, i.e. the depth of the latching groove, is 1.52 mm. Preferably, the dimensions correspond in each case to the depth T of the latching lugs. The wall thickness of the mounting in the slot region is preferably between 1 mm and 2 mm and particularly preferably not more than 2 mm. The transverse slot 22 which extends in an axial direction A along the inner wall 20 of the mounting 17 is open towards the outside of the pump head 2, i.e. at the mounting edge 23, as an insertion opening 24 for receiving the latching lug 11 and is transferred at its inner bottom 25 into a longitudinal slot 26 which extends in parallel with the edge 23 of the mounting 17. One side of the transverse slot 22 has an inclined surface 27 which extends obliquely from the insertion opening 24 of the transverse slot 22 to the longitudinal side 28 of the longitudinal slot 26 closest to the mounting edge 23, thereby shortening the longitudinal slot 26 so that the latching lug 11 can be introduced more easily into the longitudinal slot 26 via the inclined surface 27. The additionally rounded front surface 13 of the latching lug 11 reduces the friction factor when the latching lug 11 is introduced into the latching groove 21 and the rotary closure requires only an extremely low force to close.
[0037] FIG. 2 shows an oblique plan view of the pump 1, in which the securing device 18 is clearly visible. FIG. 2 shows a closure lever 29, a first sleeve 30 and a nut 31 which together with other elements (not shown) form the securing device 18. In this embodiment, the closure lever 29 is designed as a rotary vane, although alternative designs are possible. The visible first sleeve 30 shows an inclined ramp 40. The first sleeve 30 is fastened to the mounting 17. In this case, the first sleeve 30 is provided with an external thread preferably on the mounting side, said external thread engaging into a corresponding internal thread of a bore 32 on the mounting (mounting-side bore 32). The nut 31 secures the threaded connection between the first sleeve 30 of the securing device 18 and the mounting-side bore 32. The external thread allows fine adjustment in the axial direction of the pushrod 42, in the socket-side bore 12.
[0038] FIG. 2 also shows three of the four latching lugs 11 which are formed on the outer side on the socket 10 of the pump head 2. In this view, the rounded transverse lateral surface 13 of the latching lugs 11 is also oriented in particular in a clockwise direction. It is thus also apparent from FIG. 2 that the embodiment of the pump 1 shown in this case has a pump head 2 which can be fastened by means of a left-rotation after insertion of the pump head socket 10 into the mounting 17, wherein the rounded transverse sides 13 of the latching lugs 11 are guided, after insertion via the insertion opening 24 into the transverse slot 22, via the inclined surface 27 into the longitudinal slot 26 as far as to an end position 33. Of course, the specific configuration of the latching lugs 11 can also be in the other clockwise direction such that the rounded transverse lateral surfaces 13 are provided in the clockwise direction and the complementarily formed transverse and longitudinal slots as well as the inclined surfaces 27 of the latching groove 21 in the mounting 17 are correspondingly complementary thereto.
[0039] A pushrod 34 (not shown here) which is received in the first sleeve 30 and a second sleeve 35 such that it can be biased via a spring 36 slides through the opening of the bore 32 in the mounting into the socket-side bore 12 when the rotary closure is in its end position, preferably when the pushrod 34 in the mounting-side bore 32 is oriented with the socket-side bore 12. Therefore, locking and thus self-locking of the rotary closure in the end position 33 are effected via the spring-loaded pushrod closure of the securing device 18.
[0040] FIG. 3A is a cross-section through the mounting 17 of the pump drive 3 and through the securing device 18 which is provided on the mounting 17. The mounting 17 is formed from a circumferential wall 37, of which the wall thickness in the region of the transverse and longitudinal slot is significantly minimised compared to the remaining wall thickness. The mounting 17 has four latching grooves 21, wherein the insertion opening 24 of the transverse slot 22 of each latching groove 21 is visible. The inclined surface or wedge surface 27, which obliquely connects one side of the transverse slot 22 to the longitudinal side 28 of the longitudinal slot 26 closest to the mounting edge 23 is shown without hatching. In FIG. 3A, the closure pushrod or locking bolt 34 is shown in the open position. The pushrod is received in a first sleeve 30. The first sleeve 30 is fastened in a vertical bore 32 in the mounting 17, preferably via a threaded connection. In this case, the first sleeve 30 has an external thread which is expediently formed only in the region of the mounting, and the vertical bore 32 in the mounting has an internal thread. A second sleeve 35 is provided in the first sleeve 30 for accommodating the spring 36. The pushrod 34 has a thickened portion 38 in the form of a bead slightly above its end protruding into the mounting, said bead lying movably against the inner wall of the second sleeve 35. The spring 36 is arranged above this thickened portion 38 around the pushrod 34, wherein the second sleeve 35 forms, at its outer end, a stop 39 for the spring 36. Arranged at the outer end of the pushrod 34 is a lever 29 for biasing the spring 36. The spring 36 can be biased via the lever 29 and an inclined ramp 40 on the first sleeve 30.
[0041] FIG. 3B shows the inclined ramp 40 which is formed on the first sleeve 30. At the other end 41 of the pushrod, a lever 29 is provided, preferably as a rotary vane. It is located in a second position, i.e. in the open position of the locking bolt 34. Therefore, the pushrod 34 is not yet latched in the socket-side bore 12 in such a manner that the rotary closure is locked. The rotary vane can be rotated from its second position, as shown in FIG. 3B, to a first position, as shown in FIG. 4B, via a preferably 180° rotation. By means of the rotation to the first position, the pushrod 34 can be biased via the spring 36. As soon as the mounting-side bore 32 and the socket-side bore 12 are oriented perpendicular to one another, the biased pushrod 34 engages into the bore 12 of the socket. Therefore, the locking bolt 34 is located in the closed position, as shown in FIG. 4B. The spring 36 is compressed as long as the pushrod, i.e. an inner-side end 42 of the pushrod 34, lies against the outer wall of the mounting 17.
[0042] FIG. 4A shows the closure pushrod 34 in the closed position, i.e. in the locked position. The pushrod 34 is located in this position in engagement with the socket-side bore 12 (not shown here). As can be seen in FIG. 4A, the inner-side end 42 of the pushrod 34 protrudes from the inner wall 20 of the mounting 17. The rotary vane or closure lever 29 is located in this position. The spring 36 is no longer biased after the pushrod 34 engages into the socket-side bore 12 which is oriented with the bore 32 of the mounting 17. The bead-like region 38 of the pushrod 34 terminates at its face side, facing towards the socket 10, with the end of the second sleeve 35 facing towards the socket 10. The inner end of the pushrod 42 is received in a positive-locking manner in the socket-side bore 12 (not shown here). The displaceability of the pushrod 34 is apparent in FIGS. 3A and 3B with FIGS. 4A and 4B.
[0043] FIG. 4B shows the pushrod 34 in the locking position. The lever 29 is in the first position. The spring 36 is deflected. The closure lever 29 is guided in the direction of the mounting 17 via the inclined ramp 40. The pushrod protrudes inwards on the inner side or inner wall 20 of the mounting 17, and moreover for engagement into the socket-side bore (not shown here).
[0044] FIG. 5 is a side view of the pump head 2 and the pump drive 3, wherein the pump drive 3 is positioned relative to the pump head 2 such that the locking position, i.e. the closed position of the securing device, is shown during axial displacement along axis A of the pump head 2 towards the pump drive 3. The foremost latching lug 11 shown in the side view is received in the longitudinal slot 26 in the end position 33. However, the locking is then released as the closure lever 29 is located in the second position. Therefore, the closure lever 29 has been moved from the first position to the second position after locking, so that the pushrod 34 is retracted from the socket-side bore 12 by reason of the guidance of the lever 29 via the inclined ramp 27. A total of four socket-side bores 12 are provided on the pump head 2 close to the respective latching grooves 21. Therefore, the pushrod 34 of the one securing device 18 can be moved to the locking position in four positions of the pump drive 3 relative to the pump head 2. The connections 7 on the pump head housing 4 can thus be positioned in different positions relative to the drive.
LIST OF REFERENCE SIGNS
[0045] 1 pump [0046] 2 pump head [0047] 3 pump drive [0048] 4 pump head housing [0049] 5 housing wall [0050] 6 bottom [0051] 7 connections [0052] 8 relief valve [0053] 9 housing ring [0054] 10 socket [0055] 11 latching lugs [0056] 12 socket-side bore [0057] 13 rounded face-side end of the latching lug [0058] 14 drive housing [0059] 15 flange [0060] 16 drive chamber housing [0061] 17 mounting [0062] 18 securing device [0063] 19 closure arrangement [0064] 20 inner wall [0065] 21 slot-like receptacles, latching grooves [0066] 22 transverse slot [0067] 23 mounting edge [0068] 24 insertion opening [0069] 25 bottom of the transverse slot [0070] 26 longitudinal slot [0071] 27 inclined surface, wedge surface [0072] 28 longitudinal side of the longitudinal slot closest to the mounting edge [0073] 29 lever, closure lever [0074] 30 first sleeve [0075] 21 nut [0076] 32 mounting-side bore [0077] 33 end position [0078] 34 pushrod, closure pushrod, locking bolt [0079] 35 second sleeve [0080] 36 spring [0081] 37 wall [0082] 38 thickened portion [0083] 39 stop [0084] 40 inclined ramp [0085] 41 outer end of the pushrod [0086] 42 inner-side end of the pushrod
