EP3580459B1 - Method of manufacturing and assembling a pump and vacuum pump - Google Patents
Method of manufacturing and assembling a pump and vacuum pump Download PDFInfo
- Publication number
- EP3580459B1 EP3580459B1 EP18701490.7A EP18701490A EP3580459B1 EP 3580459 B1 EP3580459 B1 EP 3580459B1 EP 18701490 A EP18701490 A EP 18701490A EP 3580459 B1 EP3580459 B1 EP 3580459B1
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- European Patent Office
- Prior art keywords
- rotor
- housing
- mock
- distance
- relative
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- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 claims description 37
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 230000002441 reversible effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 2
- 238000002788 crimping Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- -1 dimensions Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2230/00—Manufacture
- F04C2230/60—Assembly methods
- F04C2230/602—Gap; Clearance
Definitions
- This invention belongs to the field of pumps comprising a rotor with one or more vanes inserted in it, the rotor being in turn contained in a housing, where subspaces are created between the vane or vanes and the housing wall and the rotor when the rotor is moved.
- pumps either a vacuum pump for magnifying the effect of a force or any other type of pump.
- These pumps usually comprise a housing and a rotor housed inside the housing.
- This rotor comprises one or more slots, so that a vane is at least partially introduced in each one of said slots.
- the housing houses this rotor, but the inner volume of the housing is greater than the volume occupied by the rotor and the vanes.
- the vanes have some space to exit the rotor due to centrifugal force or any other force provided in the pump.
- This inner volume of the housing is designed such that the vane or vanes go in and out the rotor alternatively, in such a way that the subchambers which are created between two consecutive vanes and the corresponding portion of the housing wall and the rotor have a variable volume, depending on the position of the rotor.
- the slot allows the single vane exiting the rotor in two diametrically opposed locations, so that the vane divides the main chamber in different subchambers.
- Document WO 00/52306 A1 describes a vane pumping machine that uses Invar-Class alloys for maximizing operation performance and reducing pollution emissions.
- Document US 2012/0121442 A1 describes a multistage dry vacuum pump that prevents pump from being adhesively stuck by making thermal expansion conditions between the cylinder body and the rotor similar.
- Document WO 2004/036049 describes a thermal control of vacuum pumps with a screw type configuration.
- Document US 3918855 A describes a vane pump that incorporates an adjustment mechanism for the annular slide block of a hydraulic machine.
- the invention provides a solution for this problem by means of a method for manufacturing and assembling a pump according to claim 1 and a vacuum pump according to claim 13.
- Preferred embodiments of the invention are defined in dependent claims.
- the invention provides a method for manufacturing and assembling a pump. This method comprises the steps of
- the rotor To make adequate use of the whole inner volume of the housing, the rotor must be placed eccentrically with respect to the housing, and this eccentricity must be carefully chosen to achieve a maximum ratio between the maximum subchamber volume and the minimum subchamber volume.
- this eccentricity is determined by the tangency contact between the rotor and the housing in one point, which will be called tangency point.
- the eccentricity distance is, theoretically, the housing radius minus the rotor radius.
- tangency point the eccentricity distance is, theoretically, the housing radius minus the rotor radius.
- a real tangency implies a physical contact between a part which is rotating, potentially at high speed, and a static component. Therefore, this contact will cause continuous friction and therefore loss of useful torque and further it could damage those parts.
- a gap between the rotor and the housing is needed.
- the tolerances of the components as well as of those existing in their relative positioning could lead not only in friction but, also, in physical interference between the rotor and the housing.
- This method manufactures a pump with a controlled gap between the rotor and the housing, making this pump able to effectively select this gap distance regardless dimensional and geometrical tolerances affecting the parts comprised in this pump.
- Different parameters such as pump speed, lubrication effect or performance values may be used to calculate an optimum distance, which may depend on the customer's choices. This method allows the customer and/or pump manufacturer to obtain a determined gap distance in an easy and reliable way.
- the tangency direction turns out to be a direction which joins the point of the rotor which is closer to the housing and the point of the housing which is closer to the rotor, when the rotor is located in its operation position.
- the tangency direction is perpendicular to the common tangent line.
- this tangency direction is the direction joining the centre of the housing and the centre of the rotor.
- both centres define a direction, which is the tangency direction. In other cases, when the housing is not circular, this direction also contains the centre of the rotor.
- the step of moving the housing or the rotor or rotor mock-up relative to each other comprises
- the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction comprises
- the method further comprises the step of providing sensing means which are suitable for measuring the relative position between the rotor or the rotor mock-up and the housing.
- sensing means are useful during the steps of reducing and/or increasing the distance between the housing and the rotor. Some sensors may be used to detect the moment where housing and rotor make contact, thus avoiding hitting the rotor with an uncontrolled force, and some different sensors may be used to check that the housing reaches the optimal distance, thus obtaining a final positioning of the housing in a reliable way.
- the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out by displacing the housing with respect to the rotor axis.
- Housing is usually easier to displace than the rotor, which usually needs to be displaced together with the electric motor and other parts.
- the housing comprises handling means, such as a tab, a flange or a handle.
- the steps of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out with the housing being open.
- the housing being open allows a better control for the operation of varying the distance between the rotor and the housing.
- the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out with the housing being closed (either by a previous operation or by design, being a closed cover).
- the housing comprises an opening
- the method further comprises the step of closing the opening after moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction.
- This opening allows the operator or any artificial vision device to visually control the operations of reducing and/or increasing the distance, which makes visual control easier in the event this process is not easily seen from an upper position.
- this opening allows the adjustment of the distance by using a measurement sensor or any other device through itself. The opening must be closed afterwards, for the housing to be gastight.
- the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out with the aid of some guiding means, such as pins and slots.
- Guiding means help the relative movement occur according to the tangency direction.
- the guiding means are slots; these slots must be therefore oriented in the tangency direction.
- the step of affixing the relative position between the housing and the rotor or rotor mock-up is by means of attaching means such as screws, clamps, rivets or adhesive joint.
- the step of affixing the relative position between the housing and the rotor or rotor mock-up is made by reversible fixation means, which may be removed during the pump lifetime and rearranged after maintenance operations.
- Reversible fixation means provide the opportunity of being able to recalibrate the distance between the rotor and the housing in the event that operation may misadjust the position of these elements.
- the method further comprises the step of making the rotor or the rotor mock-up rotate with respect to the rotor axis while the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is being executed.
- the fact of making the rotor rotate saves the influence of some additional tolerances in this process.
- the invention provides a vacuum pump manufactured by a method according to any of the preceding claims, the vacuum pump comprising
- This pump may be advantageously manufactured and assembled with less restrictive requirements for dimensional and geometrical tolerances, since the distance between the rotor and the housing may be adjusted independently.
- the vacuum pump further comprises handling means, such as a tab, a flange or a handle.
- the means for affixing the distance between the housing and the rotor or rotor mock-up are attaching means, such as screws, clamps, rivets or adhesive joint.
- the means for affixing the distance between the housing and the rotor or rotor mock-up are reversible fixation means, which may be removed during the assembly process or the pump lifetime and rearranged after maintenance operations.
- Figures 1a to 1d show three different steps of a first embodiment of a method for manufacturing and assembling a pump 1 according to the invention.
- Figure 1a shows the provision of a housing 2 and a rotor 3 placed on a rotor axis 31.
- FIG. 1b shows the next step of this method.
- This step comprises reducing the distance between the housing 2 and the rotor axis 31 in a tangency direction d, until the housing 2 and the rotor 3 make contact.
- sensing means are provided. These sensing means are suitable for measuring the relative position between the rotor and the housing. Although the distance is reduced until the housing 2 and the rotor 3 make contact, this should be made in a careful way, not to cause damage in any of these elements.
- an intermediate element is located between the housing and the rotor.
- the width of the intermediate element is substantially equal to the optimal distance.
- the housing 2 which is displaced towards the rotor axis 31, but in other embodiments, it is the rotor axis 31 which may be displaced towards the housing 2.
- the displacement of the housing 2 may be performed with the aid of some handling means, such as a tab, a flange or a handle.
- a calibrated machine may make use of these handling means for a more controlled movement of the housing 2.
- Figure 1c shows a further step of this method.
- This step comprises increasing the distance between the housing 2 and the rotor axis 31 in a tangency direction d, until the distance between the housing 2 and the rotor 3 is substantially equal to the optimal distance g_opt.
- the target relative position between the housing 2 and the rotor 3 can be achieved during the assembly process by the sensing means.
- these sensing means comprise known elements to control the distance between two points.
- Some sensing means which could be used are: a stroke sensor, a travel transducer, force sensors, vision sensors, gauges, calibrated parts, any combination of them or any equipment or procedure which may allow the control of the required value for this distance between the housing 2 and the rotor 3.
- Different sensing means may be used during the steps of reducing and increasing the distance between the housing 2 and the rotor 3.
- Some sensors may be used to detect the moment where housing 2 and rotor 3 make contact, and some different sensors may be used to check that the housing 2 reaches the optimal distance g_opt.
- slots 51 and pins 52 are provided in the housing 2 or in a piece which is solidly attached to the housing, and the other being comprised in the base of the rotor 32 or in a piece which is solidly attached to the base of the rotor, just for setting a position reference.
- the slots 51 are comprised in a housing support 21, which is part of the housing 2 and the pins 52 are solidly attached to the base of the rotor 32.
- the slots are oriented in the tangency direction d, in such a way that when pins 52 move within the slots 51, the rotor 3 displaces relatively to the housing 2, and the distance between the rotor 3 and the housing 2 is therefore adjusted.
- This step comprises affixing the relative position between the housing 2 and the rotor axis 3.
- the step of affixing the relative position between the housing 2 and the rotor axis 31 will be performed by means of attaching means such as screws, clamps, rivets or adhesive joint, although this step is not illustrated by the figures. Welding or crimpling may also be used for this purpose. A final attachment is therefore achieved, so that the pump works its entire lifetime with the same settings.
- this step of affixing the relative position between the housing and the rotor axis is made by reversible fixation means, which may be removed during the pump lifetime and rearranged after maintenance operations.
- Figure 2 shows a particular way of performing the steps of reducing and increasing the distance between the housing and the rotor axis.
- This figure 2 shows a housing 2 with an opening 22, so that the steps of reducing and increasing the distance between the housing and the rotor axis may be visually controlled by this opening 22, either by an operator or by any artificial vision device, or even using sensing means through the opening. This opening must be closed afterwards, so that the final housing 2 is gastight.
- Figure 3 shows the influence of this distance between the housing and the rotor (called in this graphic "g") in the operation of a vacuum pump.
- Five different values for this distance g have been used and, as discussed before, the lower this gap in the pump, the lower the absolute pressure in the output of this vacuum pump and the quicker the vacuum generation.
- the rotor is circular, with a diameter of 38 mm
- the housing is also circular, with a diameter of 48 mm.
- the optimal distance g_opt taking into account other considerations, such as required power and efficiency, should be set preferably between 0.05 and 0.25 mm.
- the optimal distance g_opt between the rotor and the housing is set, apart from the measurements of the sensing devices, from the specific product requirements (maximum vacuum level, required efficiency) and physical features of the vacuum pump (position of inlet and outlet ports or other design features).
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Description
- This invention belongs to the field of pumps comprising a rotor with one or more vanes inserted in it, the rotor being in turn contained in a housing, where subspaces are created between the vane or vanes and the housing wall and the rotor when the rotor is moved.
- Many applications need pumps, either a vacuum pump for magnifying the effect of a force or any other type of pump. These pumps usually comprise a housing and a rotor housed inside the housing. This rotor comprises one or more slots, so that a vane is at least partially introduced in each one of said slots. The housing houses this rotor, but the inner volume of the housing is greater than the volume occupied by the rotor and the vanes. Thus, when the rotor rotates, the vanes have some space to exit the rotor due to centrifugal force or any other force provided in the pump. This inner volume of the housing is designed such that the vane or vanes go in and out the rotor alternatively, in such a way that the subchambers which are created between two consecutive vanes and the corresponding portion of the housing wall and the rotor have a variable volume, depending on the position of the rotor. In the event of one single vane with a single slot, the slot allows the single vane exiting the rotor in two diametrically opposed locations, so that the vane divides the main chamber in different subchambers.
- The design of these pumps always requires thorough calculations and accurate manufacturing processes.
- Document
WO 00/52306 A1 US 2012/0121442 A1 describes a multistage dry vacuum pump that prevents pump from being adhesively stuck by making thermal expansion conditions between the cylinder body and the rotor similar. DocumentWO 2004/036049 describes a thermal control of vacuum pumps with a screw type configuration. DocumentUS 3918855 A describes a vane pump that incorporates an adjustment mechanism for the annular slide block of a hydraulic machine. - The invention provides a solution for this problem by means of a method for manufacturing and assembling a pump according to claim 1 and a vacuum pump according to claim 13. Preferred embodiments of the invention are defined in dependent claims.
- In a first inventive aspect, the invention provides a method for manufacturing and assembling a pump. This method comprises the steps of
- providing a housing;
- providing a rotor or the rotor mock-up and a rotor axis, the rotor or the rotor mock-up being inserted into the housing and being arranged to rotate around the rotor axis;
- determining an optimal distance between the housing and the rotor;
- moving the housing or the rotor or rotor mock-up relative to each other in a tangency direction, so that the distance between the rotor or the rotor mock-up and the housing is substantially equal to the optimal distance, wherein the tangency direction is the direction which joins the points of the rotor or rotor mock-up and the housing which are closer to each other when the rotor or rotor mock-up is located in its operation position; and
- affixing the relative position between the housing and the rotor or the rotor mock-up.
- To make adequate use of the whole inner volume of the housing, the rotor must be placed eccentrically with respect to the housing, and this eccentricity must be carefully chosen to achieve a maximum ratio between the maximum subchamber volume and the minimum subchamber volume.
- Theoretically, this eccentricity is determined by the tangency contact between the rotor and the housing in one point, which will be called tangency point. In other words, the eccentricity distance is, theoretically, the housing radius minus the rotor radius. However, in the real assembly, to assume a real tangency implies a physical contact between a part which is rotating, potentially at high speed, and a static component. Therefore, this contact will cause continuous friction and therefore loss of useful torque and further it could damage those parts. As a consequence, a gap between the rotor and the housing is needed. Additionally, the tolerances of the components as well as of those existing in their relative positioning, could lead not only in friction but, also, in physical interference between the rotor and the housing.
- However, the fact of ensuring a gap in the tangency point between rotor and housing is not enough in order to obtain a correct performance of the product, since having a real contact between both components is not the only negative effect that an inadequate gap distance may cause into the pump.
- If the rotor is placed too near (the gap distance being too low), there are also further problems, related to the fact that when a vane overcomes the last output port of the pump, there is a subchamber which includes this vane and the tangency point. If the gap distance is too low, the tangency point will act as a physical barrier for fluid trapped inside this subchamber, and pressure may rise excessively, potentially increasing the necessary running torque of the pump motor and even damaging the pump.
- On the other hand, if the rotor is placed too far, a bad performance is obtained, since the aforementioned ratio between the maximum volume subchamber and the minimum volume subchamber decreases, and there is more risk of air leakages between the two portions of the subchamber comprising the tangency point.
- This method manufactures a pump with a controlled gap between the rotor and the housing, making this pump able to effectively select this gap distance regardless dimensional and geometrical tolerances affecting the parts comprised in this pump. Different parameters, such as pump speed, lubrication effect or performance values may be used to calculate an optimum distance, which may depend on the customer's choices. This method allows the customer and/or pump manufacturer to obtain a determined gap distance in an easy and reliable way.
- The tangency direction turns out to be a direction which joins the point of the rotor which is closer to the housing and the point of the housing which is closer to the rotor, when the rotor is located in its operation position. In the event the rotor and the housing make contact, the tangency direction is perpendicular to the common tangent line. When both rotor and housing have a circular shape, this tangency direction is the direction joining the centre of the housing and the centre of the rotor. As these two elements are placed eccentrically, both centres define a direction, which is the tangency direction. In other cases, when the housing is not circular, this direction also contains the centre of the rotor. There may be cases wherein the arrangement of rotor and housing make the rotor make contact with two opposite points of the housing. Even in this case, the tangency direction is perfectly defined, since these two opposite points are in the same line as the points of the housing which are closer to each one of them.
- The use of a rotor mock-up instead of a rotor is another possibility which makes this method feasible.
- In a particular embodiment, the step of moving the housing or the rotor or rotor mock-up relative to each other comprises
- moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction, reducing the distance between the housing and the rotor axis, until the housing and the rotor or the rotor mock-up make contact; and
- moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction, increasing the distance between the housing and the rotor axis, so that the distance between the rotor or the rotor mock-up and the housing is substantially equal to the optimal distance.
- This way of varying the distance between the rotor and the housing is simple and effective, since the contact is made between final parts, without requiring restrictive dimensional and geometrical tolerances for the related components.
- In a particular embodiment, the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction, comprises
- locating an intermediate element between the housing and the rotor or the rotor mock-up, the width of the intermediate element being substantially equal to the optimal distance;
- moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction, reducing the distance between the housing and the rotor or motor mock-up, until the housing and the rotor or the rotor mock-up make contact with the intermediate element; and
- removing the intermediate element.
- This way of varying the distance between the housing and the rotor takes one step less compared to the previous embodiment, thanks to an intermediate element, which is interposed between the housing and the rotor.
- In a particular embodiment, the method further comprises the step of providing sensing means which are suitable for measuring the relative position between the rotor or the rotor mock-up and the housing.
- These sensing means are useful during the steps of reducing and/or increasing the distance between the housing and the rotor. Some sensors may be used to detect the moment where housing and rotor make contact, thus avoiding hitting the rotor with an uncontrolled force, and some different sensors may be used to check that the housing reaches the optimal distance, thus obtaining a final positioning of the housing in a reliable way.
- In a particular embodiment, the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out by displacing the housing with respect to the rotor axis.
- Housing is usually easier to displace than the rotor, which usually needs to be displaced together with the electric motor and other parts.
- In a particular embodiment, the housing comprises handling means, such as a tab, a flange or a handle.
- These handling means allow a calibrated machine grabber grab the housing and move it more precisely. However, in other embodiments, there is no need to contact the housing to vary the distance between the housing and the rotor; this variation may be carried out by using a magnetic device, by vacuum or by blowing.
- In a particular embodiment, the steps of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out with the housing being open.
- The housing being open allows a better control for the operation of varying the distance between the rotor and the housing.
- In a particular embodiment, the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out with the housing being closed (either by a previous operation or by design, being a closed cover).
- In a particular embodiment, in the step of providing a housing, the housing comprises an opening, and the method further comprises the step of closing the opening after moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction.
- This opening allows the operator or any artificial vision device to visually control the operations of reducing and/or increasing the distance, which makes visual control easier in the event this process is not easily seen from an upper position. Alternatively, this opening allows the adjustment of the distance by using a measurement sensor or any other device through itself. The opening must be closed afterwards, for the housing to be gastight.
- In a particular embodiment, the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is carried out with the aid of some guiding means, such as pins and slots.
- Guiding means help the relative movement occur according to the tangency direction. In the event the guiding means are slots; these slots must be therefore oriented in the tangency direction.
- In some particular embodiments, the step of affixing the relative position between the housing and the rotor or rotor mock-up is by means of attaching means such as screws, clamps, rivets or adhesive joint.
- In some particular embodiments, the step of affixing the relative position between the housing and the rotor or rotor mock-up is made by reversible fixation means, which may be removed during the pump lifetime and rearranged after maintenance operations.
- Reversible fixation means provide the opportunity of being able to recalibrate the distance between the rotor and the housing in the event that operation may misadjust the position of these elements.
- In some particular embodiments, the method further comprises the step of making the rotor or the rotor mock-up rotate with respect to the rotor axis while the step of moving the housing or the rotor or rotor mock-up relative to each other in the tangency direction is being executed.
- Advantageously, the fact of making the rotor rotate saves the influence of some additional tolerances in this process.
- In another inventive aspect, the invention provides a vacuum pump manufactured by a method according to any of the preceding claims, the vacuum pump comprising
- a housing;
- a rotor at least partially housed in the housing;
- a rotor axis, the rotor being arranged to rotate around the rotor axis; and
- means for affixing the distance between the housing and the rotor or rotor mock-up.
- This pump may be advantageously manufactured and assembled with less restrictive requirements for dimensional and geometrical tolerances, since the distance between the rotor and the housing may be adjusted independently.
- In a particular embodiment, the vacuum pump further comprises handling means, such as a tab, a flange or a handle.
- These handling means allow a calibrated machine grab the housing and move it more precisely.
- In some particular embodiments, the means for affixing the distance between the housing and the rotor or rotor mock-up are attaching means, such as screws, clamps, rivets or adhesive joint. In different embodiments, the means for affixing the distance between the housing and the rotor or rotor mock-up are reversible fixation means, which may be removed during the assembly process or the pump lifetime and rearranged after maintenance operations.
- To complete the description and in order to provide for a better understanding of the invention, a set of drawings is provided. Said drawings form an integral part of the description and illustrate an embodiment of the invention, which should not be interpreted as restricting the scope of the invention, but just as an example of how the invention can be carried out. The drawings comprise the following figures:
-
Figures 1a to 1d show three different steps of a first embodiment of a method for manufacturing and assembling a pump according to the invention. -
Figure 2 shows a particular way of performing two steps of a method for manufacturing and assembling a pump according to the invention. -
Figure 3 shows a graphic with information regarding the relation between the distance between the housing and the rotor and the output pressure in a vacuum pump according to the invention. -
Figures 1a to 1d show three different steps of a first embodiment of a method for manufacturing and assembling a pump 1 according to the invention. -
Figure 1a shows the provision of ahousing 2 and arotor 3 placed on arotor axis 31. - In different calculations, an optimal distance g_opt between the
housing 2 and therotor 3 has been determined. -
Figure 1b shows the next step of this method. This step comprises reducing the distance between thehousing 2 and therotor axis 31 in a tangency direction d, until thehousing 2 and therotor 3 make contact. - For this step, some sensing means are provided. These sensing means are suitable for measuring the relative position between the rotor and the housing. Although the distance is reduced until the
housing 2 and therotor 3 make contact, this should be made in a careful way, not to cause damage in any of these elements. - In other embodiments, instead of reducing the distance until the
housing 2 and therotor 3 make contact, and then increasing this distance until the optimal distance g_opt, an intermediate element is located between the housing and the rotor. The width of the intermediate element is substantially equal to the optimal distance. Once this intermediate element is located, the distance between the housing and the rotor axis is reduced in a tangency direction, until the housing and the rotor make contact with the intermediate element. Finally, the intermediate element is removed. - In the preferred embodiment shown in this figure, it is the
housing 2 which is displaced towards therotor axis 31, but in other embodiments, it is therotor axis 31 which may be displaced towards thehousing 2. The displacement of thehousing 2 may be performed with the aid of some handling means, such as a tab, a flange or a handle. A calibrated machine may make use of these handling means for a more controlled movement of thehousing 2. -
Figure 1c shows a further step of this method. This step comprises increasing the distance between thehousing 2 and therotor axis 31 in a tangency direction d, until the distance between thehousing 2 and therotor 3 is substantially equal to the optimal distance g_opt. - The target relative position between the
housing 2 and therotor 3 can be achieved during the assembly process by the sensing means. In some particular embodiments of the invention, these sensing means comprise known elements to control the distance between two points. Some sensing means which could be used are: a stroke sensor, a travel transducer, force sensors, vision sensors, gauges, calibrated parts, any combination of them or any equipment or procedure which may allow the control of the required value for this distance between thehousing 2 and therotor 3. Different sensing means may be used during the steps of reducing and increasing the distance between thehousing 2 and therotor 3. Some sensors may be used to detect the moment wherehousing 2 androtor 3 make contact, and some different sensors may be used to check that thehousing 2 reaches the optimal distance g_opt. - One way of ensuring that the movement between the housing and the rotor is carried out according to the tangency direction d is providing
slots 51 and pins 52, one of them being comprised in thehousing 2 or in a piece which is solidly attached to the housing, and the other being comprised in the base of therotor 32 or in a piece which is solidly attached to the base of the rotor, just for setting a position reference. In the embodiment shown infigure 1d , theslots 51 are comprised in ahousing support 21, which is part of thehousing 2 and thepins 52 are solidly attached to the base of therotor 32. The slots are oriented in the tangency direction d, in such a way that when pins 52 move within theslots 51, therotor 3 displaces relatively to thehousing 2, and the distance between therotor 3 and thehousing 2 is therefore adjusted. - One way of making this movement easier is the use of handling means 4, such as a tab, a flange or a handle or some similar element, located in the
housing 2. - There is also a further step of this method. This step comprises affixing the relative position between the
housing 2 and therotor axis 3. - In the embodiment shown in these figures, the step of affixing the relative position between the
housing 2 and therotor axis 31 will be performed by means of attaching means such as screws, clamps, rivets or adhesive joint, although this step is not illustrated by the figures. Welding or crimpling may also be used for this purpose. A final attachment is therefore achieved, so that the pump works its entire lifetime with the same settings. - In some embodiments, this step of affixing the relative position between the housing and the rotor axis is made by reversible fixation means, which may be removed during the pump lifetime and rearranged after maintenance operations.
- These embodiments may be useful when the pump is easily accessible, or the cost of rearranging the distance between the rotor and the housing is worth it, due to the overall cost of replacing the whole pump.
-
Figure 2 shows a particular way of performing the steps of reducing and increasing the distance between the housing and the rotor axis. - This
figure 2 shows ahousing 2 with anopening 22, so that the steps of reducing and increasing the distance between the housing and the rotor axis may be visually controlled by thisopening 22, either by an operator or by any artificial vision device, or even using sensing means through the opening. This opening must be closed afterwards, so that thefinal housing 2 is gastight. -
Figure 3 shows the influence of this distance between the housing and the rotor (called in this graphic "g") in the operation of a vacuum pump. Five different values for this distance g have been used and, as discussed before, the lower this gap in the pump, the lower the absolute pressure in the output of this vacuum pump and the quicker the vacuum generation. - In this particular embodiment, just as a reference, the rotor is circular, with a diameter of 38 mm, the housing is also circular, with a diameter of 48 mm. The optimal distance g_opt, taking into account other considerations, such as required power and efficiency, should be set preferably between 0.05 and 0.25 mm.
- The optimal distance g_opt between the rotor and the housing is set, apart from the measurements of the sensing devices, from the specific product requirements (maximum vacuum level, required efficiency) and physical features of the vacuum pump (position of inlet and outlet ports or other design features).
- In this text, the term "comprises" and its derivations (such as "comprising", etc.) should not be understood in an excluding sense, that is, these terms should not be interpreted as excluding the possibility that what is described and defined may include further elements, steps, etc.
- The invention is obviously not limited to the specific embodiments described herein, but also encompasses any variations that may be considered by any person skilled in the art (for example, as regards the choice of materials, dimensions, components, configuration, etc.), within the general scope of the invention as defined in the claims.
Claims (15)
- Method for manufacturing and assembling a pump (1), characterized in that the method comprises the steps ofproviding a housing (2);providing a rotor (3) or a rotor mock-up and a rotor axis (31), the rotor (3) or the rotor mock-up being inserted into the housing (2) and being arranged to rotate around the rotor axis (31);determining an optimal distance (g_opt) between the housing (2) and the rotor (3);moving the housing (2) or the rotor (3) or rotor mock-up relative to each other in a tangency direction (d), so that the distance between the rotor (3) or the rotor mock-up and the housing (2) is substantially equal to the optimal distance (g_opt), wherein the tangency direction (d) is the direction which joins the points of the rotor (3) or rotor mock-up and the housing (2) which are closer to each other when the rotor (3) or rotor mock-up is located in its operation position; andaffixing the relative position between the housing (2) and the rotor (3) or the rotor mock-up.
- Method according to claim 1, wherein the step of moving the housing (2) or the rotor (3) or rotor mock-up relative to each other comprises:moving the housing (2) or the rotor (3) or rotor mock-up relative to each other in the tangency direction (d), reducing the distance between the housing (2) and the rotor axis (31), until the housing (2) and the rotor (3) or the rotor mock-up make contact; andmoving the housing (2) or the rotor (3) or rotor mock-up relative to each other in the tangency direction (d), increasing the distance between the housing (2) and the rotor axis (31), so that the distance between the rotor (3) or the rotor mock-up and the housing (2) is substantially equal to the optimal distance (g_opt).
- Method according to claim 1, wherein the step of moving the housing (2) or the rotor (3) or rotor mock-up relative to each other comprises:locating an intermediate element between the housing (2) and the rotor (3) or the rotor mock-up, the width of the intermediate element being substantially equal to the optimal distance (g_opt);moving the housing (2) or the rotor (3) or rotor mock-up relative to each other in the tangency direction (d), reducing the distance between the housing (2) and the rotor (3) or rotor mock-up, until the housing (2) and the rotor (3) or the rotor mock-up make contact with the intermediate element; andremoving the intermediate element.
- Method according to any of claims 1 or 2, further comprising the step of providing sensing means which are suitable for measuring the relative position between the rotor (3) or the rotor mock-up and the housing (2).
- Method according to any of the preceding claims, wherein the step of moving the housing (2) or the rotor (3) or rotor mock-up relative to each other is carried out by displacing the housing (2) with respect to the rotor axis (31).
- Method according to any of the preceding claims, wherein the housing (2) comprises handling means (4), such as a tab, a flange or a handle.
- Method according to any of the preceding claims, wherein the step of moving the housing (2) or the rotor (3) or rotor mock-up relative to each other is carried out with the housing (2) being open.
- Method according to any of the preceding claims, wherein the step of providing a housing comprises providing a housing (2) with an opening (22), and the method further comprises the step of closing the opening (22) after moving the housing (2) or the rotor (3) or rotor mock-up relative to each other.
- Method according to any of the preceding claims, wherein the step of moving the housing (2) or the rotor (3) or rotor mock-up relative to each other is carried out with the aid of some guiding means, such as pins and slots.
- Method according to any of the preceding claims, wherein the step of affixing the relative position between the housing (2) and the rotor (3) or the rotor mock-up is by means of attaching means such as screws, clamps, rivets, an adhesive joint, crimping or welding.
- Method according to any of the preceding claims, wherein the step of affixing the relative position between the housing (2) and the rotor (3) or the rotor mock-up is made by reversible fixation means, which may be removed during the pump lifetime and rearranged after maintenance operations.
- Method according to any of the preceding claims, further comprising the step of making the rotor (3) or the rotor mock-up rotate with respect to the rotor axis (31) while the step of moving the housing (2) or the rotor (3) or rotor mock-up relative to each other is being executed.
- Vacuum pump (1) manufactured and assembled by a method according to any of the preceding claims, characterized in the vacuum pump (1) comprises:a housing (2);a rotor (3) at least partially housed in the housing (2);a rotor axis (31), the rotor being arranged to rotate with respect to the rotor axis (31); andmeans for affixing the distance between the housing (2) and the rotor (3) or the rotor mock-up.
- Vacuum pump (1) according to claim 13, further comprising handling means (4), such as a tab, a flange or a handle.
- Vacuum pump (1) according to claim 13, wherein the means for affixing the distance between the housing (2) and the rotor (3) or the rotor mock-up are attaching means, such as screws, clamps, rivets or adhesive joint or removable fixation means, which are removed during the assembly process or during the pump lifetime and rearranged after maintenance operations.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17382068.9A EP3361099A1 (en) | 2017-02-10 | 2017-02-10 | Method of manufacturing and assembling a pump and vacuum pump |
PCT/EP2018/051985 WO2018145925A1 (en) | 2017-02-10 | 2018-01-26 | Method of manufacturing and assembling a pump and vacuum pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3580459A1 EP3580459A1 (en) | 2019-12-18 |
EP3580459B1 true EP3580459B1 (en) | 2024-06-12 |
Family
ID=58094361
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17382068.9A Withdrawn EP3361099A1 (en) | 2017-02-10 | 2017-02-10 | Method of manufacturing and assembling a pump and vacuum pump |
EP18701490.7A Active EP3580459B1 (en) | 2017-02-10 | 2018-01-26 | Method of manufacturing and assembling a pump and vacuum pump |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17382068.9A Withdrawn EP3361099A1 (en) | 2017-02-10 | 2017-02-10 | Method of manufacturing and assembling a pump and vacuum pump |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP3361099A1 (en) |
CN (1) | CN108884833A (en) |
WO (1) | WO2018145925A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201771768U (en) * | 2010-08-06 | 2011-03-23 | 李明增 | Double-arc double-positioning vacuum pump |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2357182C2 (en) * | 1973-11-16 | 1985-05-23 | Mannesmann Rexroth GmbH, 8770 Lohr | Adjustable vane pump |
CN2246201Y (en) * | 1995-04-28 | 1997-01-29 | 丁庆生 | L.G pump |
US6162034A (en) * | 1999-03-01 | 2000-12-19 | Mallen Research Ltd., Partnership | Vane pumping machine utilizing invar-class alloys for maximizing operating performance and reducing pollution emissions |
GB0223769D0 (en) * | 2002-10-14 | 2002-11-20 | Boc Group Plc | A pump |
CN2602192Y (en) * | 2003-03-06 | 2004-02-04 | 王宏俊 | Vehicle-mounted vacuum pump |
US8177483B2 (en) * | 2009-05-22 | 2012-05-15 | General Electric Company | Active casing alignment control system and method |
KR101173168B1 (en) * | 2010-11-17 | 2012-08-16 | 데이비드 김 | multistage dry vacuum pump |
-
2017
- 2017-02-10 EP EP17382068.9A patent/EP3361099A1/en not_active Withdrawn
-
2018
- 2018-01-26 CN CN201880000773.6A patent/CN108884833A/en active Pending
- 2018-01-26 EP EP18701490.7A patent/EP3580459B1/en active Active
- 2018-01-26 WO PCT/EP2018/051985 patent/WO2018145925A1/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201771768U (en) * | 2010-08-06 | 2011-03-23 | 李明增 | Double-arc double-positioning vacuum pump |
Also Published As
Publication number | Publication date |
---|---|
EP3361099A1 (en) | 2018-08-15 |
EP3580459A1 (en) | 2019-12-18 |
CN108884833A (en) | 2018-11-23 |
WO2018145925A1 (en) | 2018-08-16 |
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