Assembly method of a scroll vacuum pump

Abstract

The invention relates, among other things, to a method for assembling a scroll vacuum pump with a pump housing for receiving a pump system comprising a stationary spiral component and a movable spiral component that interacts with it in a pumping capacity, and a deformable sleeve, in particular a bellows, arranged between the movable spiral component and a housing section of the pump housing;wherein the method comprises the following steps: fixing a first axial end of the deformable sleeve to the movable spiral component to provide an assembly, inserting the assembly into the housing section, fixing the second axial end of the deformable sleeve of the assembly to the housing section, positioning the stationary spiral component against the housing section in a pre-assembly position, aligning the stationary spiral component at an angular position relative to the assembly, and fixing the stationary spiral component in the aligned position to the pump housing section.

Description

[0001] The invention relates to a method for assembling a scroll vacuum pump and a scroll vacuum pump.

[0002] Scroll vacuum pumps are generally known from the prior art. The pumping action of such scroll vacuum pumps is achieved through the interaction of a stationary scroll component and a movable scroll component. The scroll components each have spiral-shaped webs formed on facing surfaces, which engage with spiral grooves formed between the webs of the respective oppositely arranged scroll component. The movable scroll component is moved eccentrically along a circular path by an eccentric section of a drive shaft, a process also referred to as "orbiting." During this movement, the circumferential position (i.e., angular position) of the two scroll components relative to each other remains unchanged. This means that the movable scroll component does not rotate around its own axis.By orbiting the movable spiral component, the spiral webs of the movable spiral component move in the spiral grooves of the fixed spiral component in such a way that crescent-shaped or sickle-shaped volumes enclosed between the base surfaces of the grooves and the side surfaces of the webs are spirally displaced from a radially outer position to a radially further inner position and are thereby compressed.

[0003] For efficient pumping action of scroll vacuum pumps, the alignment of the angular positions (i.e. the positions in the circumferential direction) of the two spiral components to one another is of central importance. This is also referred to as the angular alignment of the spiral components. Conventionally, the angular alignment of the two spiral components to one another takes place via the pump housing and a deformable sleeve, the so-called corrugated bellows. The movable spiral component is aligned in the circumferential direction using positioning elements (e.g. groove via dowel pin) on the corrugated bellows and is fixed against rotation in a predetermined angular position on the pump housing via the corrugated bellows. For this purpose, the corrugated bellows comprises a first fastening flange at one axial end with positioning elements which interact with corresponding positioning elements on the movable spiral component such that the movable spiral component is fixed in a predetermined angular position on the corrugated bellows.At the other axial end, the bellows comprises a second mounting flange with positioning elements that interact with corresponding positioning elements of the pump housing, so that the bellows is fixed to the pump housing in a predetermined angular position. This consequently also determines the angular position of the movable scroll component relative to the pump housing. The positioning of the stationary scroll component is achieved via positioning elements that are formed on the stationary scroll component and the pump housing and interact so that the stationary scroll component is aligned and fixed in a predetermined angular position on the pump housing.

[0004] The angular alignment of the two spiral components is thus achieved using various positioning elements that must be provided with relatively tight manufacturing tolerances on the two spiral components, on both mounting flanges of the bellows, and at various locations on the pump housing. This leads to a significant increase in the cost of manufacturing the respective components. For example, the two mounting flanges of the bellows, which each have positioning elements and are used to align the angular position of the movable spiral component, must be aligned with each other during production. This requires, for example, welding the mounting flanges in a special fixture and additional checks to ensure that the required tolerances are maintained.However, a certain amount of assembly play is necessary for the assembly to be carried out, which can lead to an addition of inaccuracies and have a negative impact on the possible positioning accuracy, especially in the case of a relatively long tolerance chain, such as from the movable spiral component via the bellows to the pump housing.

[0005] It is the object of the present invention to provide a method for assembling a scroll vacuum pump which enables a simple but nevertheless precise angular alignment of the spiral components to one another and at the same time a cost-effective production of the components of the scroll vacuum pump.

[0006] The object is achieved according to the invention by a method for assembling a scroll vacuum pump having the features of claim 1, by a method for assembling a scroll vacuum pump having the features of claim 10 and by a scroll vacuum pump having the features of claim 11.

[0007] The method according to the invention relates to the assembly of a scroll vacuum pump. It comprises a pump housing for accommodating a pumping system comprising a stationary spiral component and a movable spiral component that cooperates with the latter for pumping purposes, and a deformable sleeve, in particular a corrugated bellows, arranged between the movable spiral component and a housing section of the pump housing. The method comprises the following steps: Fixing a first axial end of the deformable sleeve to the movable scroll member to provide a mounting assembly, inserting the mounting assembly into the housing portion, fixing the second axial end of the deformable sleeve of the mounting assembly to the housing portion, placing the fixed scroll member on the housing portion in a pre-assembly position, aligning an angular position of the fixed scroll member relative to the mounting assembly, and fixing the fixed scroll member in the aligned position to the pump housing portion.

[0008] In this context, a fixation describes a state in which at least two components are connected to each other in such a way that no relative movement of a first component relative to a second component is possible. This can be achieved, for example, by clamping, screwing, or using bolts. This fixation can be permanent but can be removed, e.g., for maintenance or repair work.

[0009] "Attachment" means that the corresponding component remains movable relative to the housing section. Attachment can also include a temporary fixation that is particularly easy to remove. For example, it may be possible to rotate the component relative to the housing section. After correct alignment, the component is permanently fixed, for example, using a clamping device and / or a screw connection.

[0010] The method according to the invention offers the advantage that when inserting and securing the assembly in the housing section—a process that is often complex due to the typically cramped conditions—the angular position of the assembly can be freely selected. Angular alignment can be achieved solely by aligning the fixed spiral component, which is significantly simpler than ensuring a precise angular alignment of the assembly relative to the housing section. Consequently, positioning elements on the deformable sleeve are not absolutely necessary for the described method, which correspondingly shortens the tolerance chain and saves manufacturing costs.

[0011] Further embodiments are set forth in the claims, the description and the accompanying drawings.

[0012] According to one embodiment, the method additionally comprises fixing a mounting device having a reference feature to the movable spiral component, as well as transferring an angular position of the reference feature of the mounting device to the housing section and / or a component firmly connected to the housing section to generate a reference mark. The angular position of the stationary spiral component is aligned using the reference mark.

[0013] The term "feature" in the present context may include a superficial, for example recorded, and / or structural marking, for example a bracket, bolt or pin.

[0014] In the assembled state of the assembly device, the reference feature thus allows the transfer of an angular position of the reference feature to the housing section and / or to a component firmly connected to the housing section to create a reference mark. The transfer of the reference feature can be achieved via a marking element suitable for applying a visual mark to the housing section, for example, using a marking pen and / or a self-adhesive marking or by scoring. As a result, the angular position of the assembly and thus ultimately of the movable spiral component relative to the housing section can be clearly indicated.

[0015] The mounting device preferably has at least one positioning element that interacts with at least one complementary positioning section of the movable spiral component, so that the mounting device is fixed to the movable spiral component in a predetermined angular position. The positioning section or the positioning element can be, for example, a recess, in particular a groove or a hole. Complementary positioning elements or sections would then be, for example, corresponding elevations, e.g., ribs, or pins. For better handling, the mounting device can also be provided with at least one handle element.

[0016] In particular, the fixed scroll member has an angular position feature, and the fixed scroll member is rotated in aligning its angular position until the angular position of the angular position feature of the fixed scroll member coincides with the reference mark.

[0017] According to one embodiment, aligning the angular position of the fixed spiral component comprises the following steps: Determining a first limit angular position of the fixed scroll member relative to the mounting assembly by rotating the fixed scroll member in a first direction of rotation, determining a second limit angular position of the fixed scroll member relative to the mounting assembly by rotating the fixed scroll member in a second direction of rotation opposite to the first direction of rotation, aligning the angular position of the fixed scroll member between the first limit angular position and the second limit angular position.

[0018] The limit angle position refers to the design-related maximum rotation of the fixed spiral component relative to the mounting assembly.

[0019] Preferably, the movable spiral component is set in motion at least temporarily during the alignment of the stationary spiral component. This can be achieved, for example, by manually rotating the rotor. Depending on the relative angular position of the spiral components, start-up noises can arise between the spiral components. This allows an optimal angular position to be identified at which no or only very low start-up noises are audible. The start-up noises can also be quantified using suitable measuring devices, such as sound sensors.

[0020] According to an advantageous embodiment, the second axial end of the deformable sleeve of the mounting assembly is fixed to the housing section from one side—viewed in the axial direction—of the deformable sleeve on which the movable spiral component is arranged. For this purpose, the movable spiral component can be provided with recesses to ensure accessibility of the fixing elements used for fixing, for example, using a suitable tool.

[0021] Preferably, before the mounting assembly is fixed to the housing section, the mounting assembly is angularly positioned relative to the housing section using an angular position feature of the movable spiral component and a positioning aid of the housing section. The purpose of this is, in particular, to coordinate the positions of the inlets and outlets in the pump housing with the angular position of the spiral components. As a rule, an arrangement is preferred in which the inlets and outlets in the pump housing coincide with corresponding openings in the spiral components, at least over a large area. The angular position feature of the movable spiral component can, for example, be a radial groove forming a type of notch, which, when positioned as desired, delimits the positioning aid of the housing section, for example a marking, on both sides when viewed in the axial direction of the deformable shell.In this example, the marking would function as a "front sight." Such a "front sight" arrangement can easily be used to roughly align the mounting assembly to the housing section. However, it is understood that other types of angular orientation features and positioning aids could also be provided.

[0022] According to one embodiment, after the fixed spiral component has been fixed to the housing section, a final assembly marking is created that marks the angular position of the aligned fixed spiral component relative to the housing section. This is particularly advantageous if the fixed spiral component has to be removed again after assembly, for example, during repair and / or maintenance work, such as when replacing and / or servicing the seals, in particular tipseals. In such a case, the final assembly marking allows for simple and quick reassembly of the fixed spiral component in the correct angular alignment with the movable spiral component.

[0023] A further method according to the invention for assembling a scroll vacuum pump with a pump housing for accommodating a pump system comprising a fixed spiral component and a movable spiral component cooperating with the latter for pumping purposes, and a deformable sleeve, in particular a corrugated bellows, arranged between the movable spiral component and a housing section of the pump housing, comprises the following steps: Fixing a first axial end of the deformable sleeve to the movable spiral component in a freely selectable angular position to provide a mounting assembly, inserting the mounting assembly into the housing section and attaching the mounting assembly to the housing section in a pre-assembly position, Fixing the second axial end of the deformable sleeve of the mounting assembly to the housing portion, wherein the fixing is carried out from a side in the axial direction of the deformable sleeve on which the movable spiral component is arranged, fixing the fixed spiral component to the housing portion.

[0024] In this context, it should be noted that there may be design features that limit the freely selectable range, so that not every angular position between 0° and 360° can be selected.

[0025] According to one embodiment, an angular position of the mounting assembly relative to the housing section is aligned using a reference feature associated with the movable scroll member and a mounting position feature provided on the housing section.

[0026] Alignment of the mounting assembly is not necessarily required when aligning the fixed scroll component.

[0027] However, a rough alignment of the assembly and a final alignment of the fixed spiral component can also be carried out.

[0028] The reference feature may be formed on the movable spiral component.

[0029] The reference feature may be formed on a mounting device that is attached to the movable scroll member.

[0030] The mounting device may comprise positioning elements which interact with complementary positioning sections on the movable spiral component, so that the mounting device is fixed in at least one fixedly defined angular position on the movable spiral component.

[0031] The mounting device can have at least one positioning element that cooperates with at least one complementary positioning section in the housing section, so that the mounting device is fixed to the housing section in at least one fixedly defined angular position. If the mounting device also has at least one positioning element that cooperates with at least one complementary positioning section of the movable spiral component, so that the mounting device is fixed to the movable spiral component in a predetermined angular position, the mounting assembly can be easily applied in a well-defined angular position and subsequently fixed. The positioning section or the positioning element can, for example, be a recess, in particular a groove or a hole. Complementary positioning elements or sections would then be, for example, corresponding elevations, e.g. ribs, or pins.

[0032] In other words: If the mounting device has both positioning elements that interact with positioning sections in the movable spiral component and positioning elements that interact with positioning sections in the housing section, a simultaneous fixing of the mounting device to both the movable spiral component and to the housing section is possible and thus leads to a fixedly defined alignment of the mounting assembly to the housing section, in particular in angular alignment relative to a fixedly defined angular position of the spiral housing.

[0033] The step of attaching the mounting device to the movable scroll component can occur before the step of inserting the mounting assembly or even before the assembly is formed. The mounting device is removed again before the stationary scroll component is secured. The attachment of the mounting device to the movable scroll component, and optionally to the housing section, is thus to be understood as a temporary attachment / fixation. These statements apply to both of the above-described inventive methods for assembling a scroll vacuum pump.

[0034] The invention also relates to a scroll vacuum pump with a pump housing for accommodating a pump system comprising a fixed spiral component and a movable spiral component cooperating with the latter in a pumping-effective manner, wherein the movable spiral component is connected to a housing section of the pump housing via a deformable sleeve, in particular a corrugated bellows, and a first axial end of the sleeve is fixed to the movable spiral component in a freely selectable angular position by a first fixing device.

[0035] The first fixing device can comprise, for example, a clamp connection and / or a screw connection as a fastening element. For adjusting the fastening element, the first axial end of the sleeve and / or the movable spiral component can have at least one elongated recess. The angular position of the movable spiral component is not aligned via the deformable sleeve, but rather, for example, by an assembly device. Positioning elements on the deformable sleeve and / or the movable spiral component are thus not required, which reduces the manufacturing costs of the components, in particular the corrugated bellows, and improves alignment accuracy due to the elimination of assembly play.

[0036] According to one embodiment, the second axial end of the sleeve is fixed to the housing section by a second fixing device, and the movable spiral component has at least one mounting recess, in particular on an outer peripheral edge of the movable spiral component, which is configured and designed so that the second fixing device can be actuated by a tool from the side of the movable spiral component.

[0037] The second fixing device can be designed and configured in such a way that, in addition to fixing, it also allows positioning in a pre-assembly position, in which, in particular, rotation of the deformable sleeve relative to the housing section is possible. This can be achieved, for example, by a clamping device comprising fixing elements, such as screws, and clamping elements, such as washers, that engage around a flange-like edge of the sleeve. For pre-assembly, the screws are lightly tightened to create a slight clamping force. The screws are then tightened for final fixing.

[0038] Because the at least one mounting recess allows access to the second fixing device from the side of the movable spiral component, the installation of the sleeve in the housing section is facilitated. The appropriate tool, such as a screwdriver, can be guided through the mounting recess to access the second fixing device.

[0039] According to one embodiment, the fixed spiral component is fixed to the housing section by a third fixing device depending on an angular position of the movable spiral component.

[0040] The angular position of the fixed spiral component is thus aligned based on the actual angular position of the previously mounted movable spiral component. The resulting short tolerance chain, consisting only of the spiral components, enables more cost-effective production and increases assembly accuracy.

[0041] In particular, the third fixing device may comprise an adjusting device for adapting the angular position of the fixed spiral component relative to the housing section.

[0042] The adjusting device can have an elongated hole, in particular an arcuate elongated hole.

[0043] The scroll vacuum pump according to the invention is suitable for being assembled by means of at least one of the described assembly methods.

[0044] The invention is described below purely by way of example using advantageous embodiments with reference to the accompanying drawings. They show: Fig. 1a cross-sectional view of a scroll vacuum pump, Fig. 2aa cross-sectional view of a mounting device, Fig. 2ba cross-sectional view of the fixed mounting device from Fig. 2a during assembly of a scroll vacuum pump, Fig. 2c a front view of Fig. 2b , Fig. 2 top view of Fig. 2b , Fig. 3a a front view of a spiral casing, Fig. 3b a top view of a scroll vacuum pump with aligned spiral casing, Fig. 4 an axial view into a pump casing of a scroll vacuum pump and Fig. 5 a front view of a movable spiral component

[0045] The Fig. 1 shows a scroll vacuum pump 20 (short "scroll pump"). The scroll pump 20 comprises a housing section 22 and a spiral casing 24, wherein the spiral casing 24 has a pump-active structure, namely a spiral wall 26. The spiral casing 24 thus forms a fixed spiral component of the scroll pump 20. In the illustration of the Fig. 1 The stationary scroll component is formed integrally within the scroll casing 24, which is why both terms are used synonymously below. However, embodiments are also conceivable in which the scroll casing 24 and the stationary scroll component comprise separate, interconnected elements. Such an embodiment is to be understood as being included in the designation "scroll casing 24," with the following statements in this case referring to the stationary scroll component.

[0046] The spiral wall 26 of the stationary spiral component or spiral housing 24 interacts with a spiral wall 28 of a movable spiral component 30, wherein the movable spiral component 30 is moved eccentrically via an eccentric shaft 32 to generate a pumping effect. A gas to be pumped is conveyed from an inlet 31, which is located in the housing section 22, to an outlet 33, which is formed in the spiral housing 24.

[0047] The eccentric shaft 32 is driven by a motor 34 and is supported by two roller bearings 36. It comprises an eccentric pin 38 arranged eccentrically to its rotational axis, which transmits its eccentric deflection to the movable spiral component 30 via a further roller bearing 40. For sealing purposes, a Fig. 1 The left-hand end of a movable sleeve in the form of a bellows 42 is attached, the right-hand end of which is attached to the housing section 22. The left-hand end of the bellows 42 follows the deflection of the movable spiral component 30, while the right-hand end of the bellows 42 is stationary during operation of the scroll pump 20.

[0048] For the efficient operation of the scroll pump 20, it is essential that the volute casing 24 and the movable scroll member 30 are aligned with each other in a well-defined manner, particularly with regard to their angular position.

[0049] A method according to the invention for assembling a scroll vacuum pump 20 is described below with reference to the Figuren 2a bis 5 The sequence of the process steps refers to the respective embodiment shown, but embodiments with a different sequence of process steps are also conceivable.

[0050] First, a first axial end (left in Fig. 1 ) of the bellows 42 is fixed to the movable spiral component 30, so that the bellows 42 and the spiral component 30 form an assembly. The assembly is then inserted into the housing section 22. The second axial end (right in Fig. 1 ) of the bellows 42 is now fixed to the housing section 22. The axial ends of the bellows 42 typically each comprise a flange for this purpose. Since the relative angular position of the bellows 42 and the movable spiral component 30 is irrelevant, the fixation can be achieved, for example, by means of screws, each provided with a washer, which engage behind the flange when the screws are screwed into the movable spiral component 30. Other clamping means are conceivable.

[0051] In the present embodiment, shown in Fig. 2b , the mounting assembly is fixed to the housing section 22 from one side - seen in axial direction A - of the bellows 42, i.e. from the left parallel to a pump axis 43. For this purpose, the movable spiral component 30 can be provided with mounting recesses 300 (see Fig. 2c ), which ensure accessibility of the fixing elements arranged on the housing section 22 for a suitable tool.

[0052] In the present example, the pre-assembly of the bellows 42 on the housing section 22 is carried out by means of a clamping process. For this purpose, screws 209 and suitable clamping elements in the form of washers 211 are provided, which engage behind a flange-like end section 212 of the bellows 42. This is shown in the enlarged section in Fig. 2b The screws 209 are screwed into screw holes 304 in the housing section 22 (see Fig. 4 ).

[0053] It is understood that a comparable type of fixation can be provided for fastening the bellows 42 to the movable spiral part 30.

[0054] Once the desired angular alignment is achieved, the mounting assembly can be fixed to the housing section 22 by tightening the screws 209.

[0055] In order to detect the angular position of the movable spiral component 30, a mounting device 200 (shown in Fig. 2a ) is fixed to the movable scroll member 30. This can be done before or after the assembly assembly is formed, so that the mounting device 200 can be used upon insertion into the housing section 22. However, it is also possible to attach the mounting device 200 to the movable scroll member 30 only after the assembly assembly has been attached to the housing section 22.

[0056] The mounting device 200 has positioning elements 202 (here in the form of pins) that interact with complementary positioning sections 203 (here in the form of holes) of the movable spiral component 30, so that the mounting device 200 is fixed in a predetermined angular position on the movable spiral component 30. It is understood that the angular position of the two components can also be ensured by other means, for example, by ribs and complementary grooves. In the embodiment shown, the mounting device has at least one handle element 205 for easier handling.

[0057] Now, the angular position of the movable spiral component 30, which is fixed relative to the housing section 22 in the direction of rotation via the bellows 42, is transferred to the housing section 22. For this purpose, the mounting device 200 has a reference feature 201, which is shown in the Fig. 2a-d exemplified as a cantilever extending in the axial direction. With the help of the reference feature 201, the angular position of the mounting device 200 can be used to apply a reference marking 206 to the housing section 22 (see Fig. 2d ). In the embodiment shown in Fig. 2a-d The reference marking 206 can be applied to the housing section 22, for example, using a marking element, such as a marking pen or a self-adhesive marker. Other embodiments of the reference feature 201 are conceivable. After applying the reference marking 206, the mounting device 200 can be removed.

[0058] Next, the spiral casing 24 is placed in a pre-assembly position on the casing section 22. In this pre-assembly position, the reference angular position of the spiral casing 24 is still adjustable, i.e., it is rotatable relative to the casing section 22. In the embodiment of Fig. 3a This is done via at least one fixing element in the form of a screw 241 in conjunction with an adjusting element in the form of a curved slot 240, which is used to attach and - after alignment - fix the spiral casing 24 to the casing section 22. The screw 241 is first inserted through the corresponding slot 240 and into one of the Fig. 2c shown fixing devices 207 (here in the form of screw holes) and tightened slightly.

[0059] The spiral casing 24 is then rotated – the necessary degree of freedom is provided by the curved extension of the slots 240 – until it assumes the correct angular position. As shown in Fig. 3b As shown, the spiral casing 24 is rotated until an angular position feature 208 of the spiral casing 24 is aligned with the reference mark 206.

[0060] The angular position of the spiral casing 24 is then correctly aligned relative to the mounting assembly, and thus ultimately to the movable spiral component 30, and the spiral casing 24 can be fixed in the final assembly position, in this case by tightening the screw 241.

[0061] According to a further method, the spiral housing 24 can be aligned relative to the movable spiral component 30 by rotating the spiral housing 24 relative to the housing section 22, initially in a first direction of rotation and then in an opposite second direction of rotation, determining the limiting angular positions in the first and second directions of rotation, and aligning the spiral housing 24 in an angular position between the two limiting angular positions. This process can be iterative in order to gradually approximate the optimal angular position. Preferably, when determining the angular position, the movable spiral component 30 is also set in motion at least temporarily, for example by manually rotating the eccentric shaft 32. By adjusting the angular position of the spiral housing 24, start-up noises occurring between the spiral housing 24 and the movable spiral component 30 can be minimized.

[0062] Preferably, after the volute casing 24 is secured to the housing section 22, a final assembly mark is created that marks the angular position of the aligned volute casing 24 relative to the housing section 22. For example, several final assembly marks can be provided, distributed in the circumferential direction. The final assembly mark facilitates, for example, the correct positioning of the volute casing 24 after maintenance work during which the volute casing 24 must be removed from the housing section 22. It can be particularly helpful in cases where the pump 20 is installed in a confined space and the reference mark 206 is obscured or difficult to read.

[0063] The fixing of the mounting assembly to the housing section 22 is explained in detail below.

[0064] As already described above, the mounting assembly is inserted into the housing section 22 and positioned there in a pre-assembly position. In this case, the pre-assembly position is configured such that the mounting assembly remains freely rotatable relative to the housing section 22, but there is little or no play in the axial direction A and / or radial direction (perpendicular to A).

[0065] A suitable embodiment of the housing section 22 is shown in Fig. 4 shown. The housing section 22 has a positioning aid 302, which enables an angular alignment of the mounting assembly. For positioning the mounting assembly in the pre-assembly position, the housing section 22 has an assembly guide in the form of a bellows groove 303, which is designed and configured to receive the second axial end of the bellows 42, e.g., a flange-like end or fastening section 212 (see Fig. 2b ).

[0066] In some cases, in addition to or as an alternative to the precise alignment described above, a coarse alignment may be provided. The coarse angular alignment of the movable spiral component 30 relative to the housing section 22 is carried out, for example, as shown in Fig. 5 The movable spiral component 30 has suitable angular position features 301, which enable alignment with the positioning aid 302. In the Fig. 5 In the embodiment shown, this is achieved using the "front sight-front sight principle," with the angular position features 301 forming the "front sight" and the positioning aid 302 forming the "front sight." Also shown are the mounting recesses 300 in the movable spiral component 30. These allow the fixing elements 209 to be reached in the axial direction A on one side of the bellows 42. In other words, it is thus possible to guide a suitable tool, for example a screwdriver, from the end face of the housing section 22 in the axial direction A past the spiral component 30 and the bellows 42 to the fixing elements in the form of screws 209. It is thus possible to fix the mounting assembly without having to reach the side of the housing section 22 facing away from the bellows 42, i.e., without having to pass fixing means through the housing section 22 from the right.

[0067] For the purpose of angular alignment, a mounting device 200 can be fixed to the movable spiral part 30, wherein the mounting device 200 has a reference feature 201 as shown in Fig. 2a The alignment of an angular position of the mounting assembly relative to the housing section 22 is performed using the reference feature 201 of the mounting device 200 and a mounting position feature 206 attached to the housing section 22 and / or to a component firmly connected to the housing section 22. The mounting position feature 206 indicates the desired angular position of the mounting assembly relative to the housing section 22.

[0068] This angular alignment of the movable scroll member 30 may precede the precise alignment of the scroll casing 24 described above, but is not absolutely necessary in all cases. It may serve the purpose of the correct angular alignment

[0069] The mounting device 200 may also comprise at least one positioning element 204 (this is dispensable for the methods described further above) which is associated with a corresponding positioning section 210 in the housing section 22, as shown in Fig. 2b is shown. The positioning element 204 can, for example, be a pin, and the positioning section 210 a matching hole. If the mounting device 200 additionally has at least one positioning element 202, which is assigned to a corresponding positioning section 203 in the movable spiral component 30, the combination of the positioning elements 202, 204 and positioning sections 203, 210 thus enables the simultaneous fixing of the mounting device 200 to the movable spiral component 30 and the housing section 22 to result in a fixedly defined angular position of the movable spiral component 30 relative to the housing section 22, in which the movable spiral component 30 or the mounting assembly is subsequently fixed. In this embodiment, the mounting position feature 206 and the reference feature 201 are therefore not absolutely necessary. Bezugszeichenliste

[0070] 20Scroll vacuum pump 22Housing section 24Volume casing 26Volume wall 28Volume wall 30Movable scroll component 31Inlet 32Eccentric shaft 33Outlet 34Motor 36Rolling bearing 38Eccentric pin 40Rolling bearing 42Movable sleeve 43Pump axis 200Mounting device 201Reference feature 202Positioning element 203Positioning section 204Positioning element 205Handle element 206Marking 207Fixing section 208Angular position feature 209Fixing element 210Positioning section 211Clamping element 212End or fastening section 240Elongated hole 241Fixing element 300Mounting recess 301Angular position feature 302Positioning aid 303Mounting guide 304Fixing section AAxial direction

Claims

1. Method for assembling a scroll vacuum pump (20) with a pump housing for accommodating a pump system comprising a fixed spiral component (24) and a movable spiral component (30) cooperating with the latter for pumping purposes, and a deformable sleeve (42), in particular a corrugated bellows, arranged between the movable spiral component (30) and a housing section (22) of the pump housing;the method comprising the following steps: fixing a first axial end of the deformable sleeve (42) to the movable scroll member (30) to provide a mounting assembly, inserting the mounting assembly into the housing section (22), fixing the second axial end of the deformable sleeve (42) of the mounting assembly to the housing section (22), attaching the fixed scroll member (24) to the housing section (22) in a pre-assembly position, aligning an angular position of the fixed scroll member (24) relative to the mounting assembly, and fixing the fixed scroll member (24) in the aligned position to the pump housing section (22).

2. The method according to claim 1, wherein the method additionally comprises the following steps: fixing a mounting device (200) to the movable spiral component (30), wherein the mounting device (200) has a reference feature (201), transferring an angular position of the reference feature (201) of the mounting device (200) to the housing section (22) and / or to a component fixedly connected to the housing section to produce a reference mark (206), wherein the angular position of the stationary spiral component (24) is aligned using the reference mark (206).

3. The method according to claim 2, wherein the mounting device (200) has at least one positioning element (202) which cooperates with at least one complementary positioning section (203) of the movable spiral component (30) so that the mounting device (200) is fixed in a predetermined angular position on the movable spiral component (30).

4. The method according to claim 2 or 3, wherein the fixed scroll member (24) has an angular position feature (208), and the fixed scroll member (24) is rotated in aligning its angular position until the angular position of the angular position feature (208) of the fixed scroll member (24) coincides with the reference mark (206).

5. The method according to claim 1, wherein aligning the angular position of the fixed scroll member (24) comprises the following steps: determining a first limit angular position of the fixed scroll member (24) relative to the mounting assembly by rotating the fixed scroll member (24) in a first direction of rotation, determining a second limit angular position of the fixed scroll member (24) relative to the mounting assembly by rotating the fixed scroll member (24) in a second direction of rotation opposite to the first direction of rotation, aligning the angular position of the fixed scroll member (24) between the first limit angular position and the second limit angular position.

6. The method according to claim 5, wherein the movable spiral component (30) is set in motion at least temporarily during the alignment of the fixed spiral component (24).

7. Method according to one of the preceding claims, wherein the fixing of the second axial end of the deformable sleeve (42) of the mounting assembly to the housing portion (22) takes place from a side in the axial direction (A) of the deformable sleeve (42) on which the movable spiral component (30) is arranged.

8. Method according to one of the preceding claims, wherein, before fixing the mounting assembly to the housing section (22), an angular positioning of the mounting assembly relative to the housing section (22) is carried out using an angular position feature (301) of the movable spiral component (30) and a positioning aid (302) of the housing section (22).

9. Method according to one of the preceding claims, wherein after fixing the fixed scroll component (24) to the housing section (22), a final assembly mark is produced which marks the angular position of the aligned fixed scroll component (24) relative to the housing section (22).

10. Method for assembling a scroll vacuum pump (20) with a pump housing for accommodating a pump system which comprises a fixed spiral component (24) and a movable spiral component (30) cooperating with the latter in a pumping manner, and a deformable sleeve (42), in particular a corrugated bellows, arranged between the movable spiral component (30) and a housing section (22) of the pump housing;wherein the method comprises the following steps: fixing a first axial end of the deformable sleeve (42) to the movable spiral component (30) in a freely selectable angular position to provide a mounting assembly, inserting the mounting assembly into the housing section (22) and placing the mounting assembly on the housing section (22) in a pre-assembly position, fixing the second axial end of the deformable sleeve (42) of the mounting assembly to the housing section (22), wherein the fixing takes place from a side of the deformable sleeve (42) on which the movable spiral component (30) is arranged, fixing the fixed spiral component (24) to the housing section (22).

11. The method according to claim 10, wherein an angular position of the mounting assembly (200) relative to the housing section (22) is aligned using a reference feature (201, 301) associated with the movable scroll member and a mounting position feature (206, 302) provided on the housing section (22), wherein the reference feature (301) is formed on the movable scroll member (30) and / or wherein the reference feature (201) is formed on a mounting device (200) that is attached to the movable scroll member (30).

12. Scroll vacuum pump (20) with a pump housing for accommodating a pump system which comprises a fixed spiral component (24) and a movable spiral component (30) which cooperates with the latter in a pumping-effective manner, wherein the movable spiral component (30) is connected to a housing section (22) of the pump housing via a deformable sleeve (42), in particular a corrugated bellows, and a first axial end of the sleeve (42) is fixed to the movable spiral component (30) in a freely selectable angular position by a first fixing device.

13. Scroll vacuum pump (20) according to claim 12, wherein the second axial end of the sleeve (42) is fixed to the housing section (22) by a second fixing device, and the movable spiral component (30) has at least one mounting recess (300), in particular on an outer peripheral edge of the movable spiral component (30), which is designed and configured so that the second fixing device can be actuated by a tool from the side of the movable spiral component (30).

14. Scroll vacuum pump (20) according to claim 12 or 13, wherein the fixed spiral component (24) is fixed to the housing section (22) by a third fixing device depending on an angular position of the movable spiral component (30).

15. Scroll vacuum pump (20) according to claim 14, wherein the third fixing device comprises an adjusting device for adjusting the angular position of the fixed spiral component (24) relative to the housing section (22), in particular wherein the adjusting device comprises at least one elongated hole (240).

Images