Method and device for fixing and synchronizing rotary pistons in a rotary piston pump

Abstract

A method and a device for fixing and synchronizing rotary pistons in a rotary piston pump involves introducing the rotary pistons into the pump space of the rotary piston pump. A shaft stub of each rotary piston is then pushed through a pump rear wall onto a driveshaft provided for the respective rotary piston. The rotary pistons are aligned and synchronized in the pump space via a template, the template being fixed detachably to a pump housing. The shaft stubs of the respective rotary piston are connected, after the synchronization, in each case via a clamping device in a friction-locked manner to the respective driveshaft, outside the pump space.

Claims

1. A method for fixing and synchronizing rotary pistons in a rotary piston pump, comprising: introducing the rotary pistons into a pump space of the rotary piston pump; pushing a shaft stub of each of the rotary pistons through a pump rear wall and onto a respective driveshaft provided for the respective rotary piston; aligning and synchronizing the rotary pistons with a template, the template including a plurality of guides configured to engage the rotary pistons to position each rotary piston at a selected angular orientation, the template being fixed detachably to a pump housing; and after the synchronizing step, connecting the shaft stubs of the respective rotary piston, in each case using a clamping device in a friction-locked manner, to the respective driveshaft outside the pump space.

2. The method according to claim 1, further comprising: before the introducing step, detachably pushing and fixing seals onto the shaft stubs of the rotary pistons.

3. The method according to claim 1, further comprising: placing the template on the rotary pistons using the plurality of guides.

4. The method according to claim 1, further comprising: simulating a spacing that is required for a lining, and for a pump lid after installation of the rotary pistons, by at least two spacers on a inner side of the template and by protrusions on the plurality of guides.

5. The method according to claim 2, further comprising: adjusting a spacing between the rotary pistons and the pump rear wall using the seals.

6. The method according to claim 4, further comprising: when the template is detached from the pump housing, fixing the template to the pump lid by at least two lugs which are disposed on a base body of the template.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows an installed rotary piston according to the invention with a clamping device.

(2) FIG. 2 shows the front view of the connection of the shaft stub and the driveshaft.

(3) FIG. 3 shows the positioning and synchronization of the rotary pistons with the template.

(4) FIGS. 4 and 5 show a template according to the invention.

(5) FIG. 6 shows a template according to the invention with a rotary piston.

(6) FIG. 7 shows the interaction of the template with the rotary piston.

(7) FIGS. 8 and 9 show the position of the template when not in use on a rotary piston pump.

DETAILED DESCRIPTION OF THE INVENTION

(8) FIG. 1 shows an installed rotary piston 12 according to the invention with a clamping device 22. Rotary piston 12 is disposed in pump space 14 of rotary piston pump 10. A shaft stump 16 is disposed on the side of rotary piston 12 facing pump rear wall 18. This shaft stub 16 is provided with a seal 24 and is pushed over driveshaft 20. Furthermore, a clamping device 22 is disposed on outer end 17 of shaft stub 16. Shaft stub 16 and driveshaft 20 are connected detachably to one another in a friction-locked manner by means of this clamping device 22. When clamping screws 30 are tightened up, clamping device 22 is pressed into a sleeve 23. As a result of this pressing, clamping device 22 at outer side 34 is pressed against sleeve 23 and at inner side 36 against shaft stub 16. Shaft stub 16 is thereby pressed onto driveshaft 20 and is brought into an active connection with the latter in a friction-locked manner.

(9) Clamping device 22 thus works mechanically via parts with conical faces and, when clamping screws 30 are operated, leads to a reduction in the internal cross-section of the annular components engaging into one another. In the described embodiment, the components are driveshaft 20 and shaft stub 16.

(10) FIG. 2 shows the front view of the connection of shaft stub 16 and driveshaft 20. Clamping device 22 is connected via shaft stub 16 of the rotary piston (not represented) to driveshaft 20. Cutout 32 is almost closed as a result of tightening up clamping screws 30, so that shaft stub 16 is pressed onto driveshaft 20 in a friction-locked manner.

(11) FIG. 3 shows the positioning and synchronization of rotary pistons 12 with template 40. Rotary pistons 12 can be seen in pump space 14. Template 40 is fixed with screws 28 to pump housing 11. Rotary pistons 12 are positioned and synchronized by means of guides 42. With the aid of spacers 44, the spacing is set that rotary pistons 12 require from the pump lid (not represented) after dismantling of template 40.

(12) FIGS. 4 and 5 show a template 40 according to the invention. Template 40 comprises a base body 41 which comprises an inner side 46 and an outer side 47. Disposed on outer side 47 are lugs, with which template 40 can be fixed to the pump housing during positioning and synchronization of the rotary pistons (not represented) and to the pump lid when not in use. Disposed on inner side 46 are guides 42, with which the rotary pistons (not represented) are guided into the rotary piston pump during positioning and synchronization. Guides 42 are provided with protrusions 48 in the lower region close to base body 41 of template 40. Furthermore, a plurality of spacers 44 are positioned on inner side 46 of template 40. A spacing of template 40 from the rotary pistons is ensured by spacers 44 and protrusions 48 during positioning and synchronization of the rotary pistons in the rotary piston pump. This spacing is required to compensate for the thickness of the lining of the pump lid.

(13) FIG. 6 shows a template 40 according to the invention with rotary pistons 12. During positioning and synchronization of rotary pistons 12 in a rotary piston pump (not represented), the latter are guided and synchronized by guides 42. The required spacing that rotary pistons 12 must have from template 40 during the positioning and synchronization is ensured by the height/thickness of spacers 20 and protrusions 48.

(14) FIG. 7 shows the interaction of template 40 with rotary pistons 12. Rotary pistons 12 are introduced into template 40 and are guided and synchronized by the guides (not represented). The position of rotary persons 12 with respect to one another can be seen particularly well, which reveals good synchronization for the embodiment shown. The position and alignment of rotary pistons 12 in the rotary piston pump is not changed again subsequently, after the removal of template 40.

(15) FIGS. 8 and 9 show the position of template 40 when not in use on a rotary piston pump 10. When template 40 is not being used for the positioning and synchronization of the rotary pistons (not represented), the latter can be fixed and positioned in a space-saving manner and securely on the outer side of rotary piston pump 10. Template 40 is fixed to pump lid 26 of rotary piston pump 10 by means of lugs 50. Template 40 is fixed to rotary piston pump 10 by means of screws 28. This manner of retention ensures that the correct template 40 is always present when rotary pistons have to be positioned and synchronized in rotary piston pump 10.

(16) The invention has been described by reference to a preferred embodiment.

LIST OF REFERENCE NUMBERS

(17) 10 Rotary piston pump 11 Pump housing 12 Rotary piston 14 Pump space 16 Shaft stub 17 Outer end 18 Pump rear wall 20 Driveshaft 22 Clamping device 23 Sleeve 24 Seal 26 Pump lid 28 Screw 30 Clamping screw 32 Cutout 34 Outer side of clamping device 36 Inner side of clamping device 40 Template 41 Base body 42 Guides 44 Spacer 46 Inner side of template 47 Outer side of template 48 Protrusions of guides 50 Lugs