The present invention relates to a method and a device for fixing and synchronizing rotary pistons in a rotary piston pump.
German patent DE 197 56 838 C1 discloses a rotary piston pump with a plurality of rotary piston pairs disposed on parallel shafts. These rotary pistons rotate free from contact and concentrically in the circular housing sections which form the pump chambers. The rotary pistons are connected non-rotatably by means of tongue-and-groove joints to the respective assigned shaft. For this purpose, a feather key is provided in each case, which engages on the one hand in a shaft keyway and on the other hand in a groove of the rotary piston.
German patent application DE 198 06 657 A1 discloses a rotary pump with a pump housing oval in cross-section, with a pair of rotors engaging into one another and disposed in the housing on two parallel shafts capable of being driven in a rotary manner in opposite directions, said rotors each comprising two or more displacement vanes. The displacement vanes rotate with the rotation of the rotors in a sealing manner adjacent to the inner side of the wall of the pump housing and to the respective other rotor. The rotors can be pulled off in the longitudinal direction of the shafts from the latter when the pump housing is opened, the shafts being coupled with one another by torque transmission means, such as a pair of meshing gear wheels or a chain drive or belt drive. One of the shafts can be connected to a drive motor. The rotor pump according to the invention is characterised in that the torque transmission means are constituted with a coupling which is engaged in the basic state and can be disengaged when required.
The problem underlying the invention is to provide a method with which the rotary pistons of a rotary piston pump can be fixed and aligned and synchronized in the pump space.
The problem according to the invention is solved by a method for fixing and synchronizing rotary pistons in a rotary piston pump, characterised in that the rotary pistons are introduced into a pump space of the rotary piston pump; a shaft stub of each rotary piston is pushed through a pump rear wall and onto a driveshaft provided for the respective rotary piston; the rotary pistons are aligned and synchronized with a template, the template being fixed detachably to a pump housing and the shaft stubs of the respective rotary piston are connected, after the synchronization, in each case by means of a clamping device in a friction-locked manner to the respective driveshaft outside the pump space.
Further advantageous embodiments can be derived from the features of the dependent claims.
A further problem of the invention relates to a device, with which the rotary pistons can be positioned and synchronized in a rotary piston pump.
This problem is solved by means of a template for positioning and/or synchronizing rotary pistons in a rotary piston pump, characterised in that the template comprises a base body on which a plurality of guides are disposed.
A method for fixing and synchronizing rotary pistons in a rotary piston pump is disclosed. The rotary pistons are introduced into a 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 with 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 by means of a clamping device in a friction-locked manner to the respective driveshaft, outside the pump space.
The connections between the shaft stubs and the driveshafts are sealed in each case by a seal against the pump space. Before the introduction of the rotary pistons into the pump space, the seals are pushed detachably onto the shaft stubs of the rotary pistons and are fixed there.
The template is placed on the rotary pistons by means of guides. The spacing required for the lining of a pump lid after installation of the rotary pistons is simulated by at least two spacers on the inner side of the template and by protrusions on the guides. The required spacing between the rotary pistons and the pump rear wall is adjusted by means of the seals. This takes place by the fact that the seal projects minimally into the pump space.
When not being used, the template is fixed to the pump lid by at least two lugs which are disposed on a base body of the template. These lugs are the same lugs with which the template is fixed to the pump housing during the positioning and synchronization.
Furthermore, a template for positioning and/or synchronizing rotary pistons in a rotary piston pump is disclosed. The template comprises a base body, on which a plurality of guides are disposed. Fixed positions of the rotary pistons can be set with the template.
It is possible with the template to manage both double-vane rotary pistons as well as multi-vane rotary pistons. Furthermore, both flat and helical rotary pistons can be positioned and/or synchronized in the rotary piston pump using the template. This is possible because the guides are constituted as rails or as pins. In the preferred embodiments, rails are described which are positioned on the rotary pistons and guide the latter at the longitudinal sides. Twisting of the rotary pistons is eliminated by this exact guidance. Pins or bolts are preferred for the positioning and synchronization of multi-vane rotary pistons. Still smaller guide rails can also be used, so that twisting during use of the template is also made impossible in the case of multi-vane rotary pistons.
In a preferred embodiment, it is possible to design the guides variable in length, i.e. into the pump. Through the possibility of a change in length, it is then also possible to position and/or synchronize rotary pistons and/or pairs of rotary pistons which are positioned in a second row in the pump space.
The base body of the template comprises at least two lugs, with which the template can be fixed to a pump housing during the positioning and synchronization of the rotary pistons and to a pump lid when not in use.
Rotary pistons for a rotary piston pump are disclosed for use in the method according to the invention, wherein these rotary pistons each have a shaft stump which is connected fixedly to the rotary piston. Before the installation of the rotary piston in a rotary piston pump, a seal is disposed detachably on the shaft stump and fixed there. The seal is a slip ring seal or a stuffing box or a lip seal.
Examples of embodiment of the invention and their advantages will be explained in greater detail below with the aid of the appended figures. The size ratios of the individual elements with respect to one another in the figures do not always correspond to the actual size ratios, since some forms are represented simplified and other forms are represented magnified compared with other elements for the sake of better clarity.
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.
The invention has been described by reference to a preferred embodiment.
Number | Date | Country | Kind |
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10 2012 003 066 | Feb 2012 | DE | national |
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Entry |
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International Search Report Application No. PCT/DE2013/100056 Completed: Feb. 18, 2014; Mailing Date: Feb. 28, 2014 2 pages. |
Number | Date | Country | |
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20140345451 A1 | Nov 2014 | US |
Number | Date | Country | |
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Parent | PCT/DE2013/100056 | Feb 2013 | US |
Child | 14453264 | US |