• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Bearing shield for mounting a bearing (23) for the shaft (8a, 8b) of a rotor (7a, 7b) in the housing (2) of a compressor (1), expander, vacuum pump or the like, the bearing shield (5 ) is made of a metal plate (12) wherein a bearing seat (10) for the bearing (23) is formed by deep drawing and / or stamping the metal plate (12) and / or by welding a tube to the metal plate (12).
    公开号:BE1021778B1
    申请号:E2013/0714
    申请日:2013-10-22
    公开日:2016-01-18
    发明作者:Peter Karel Anne-Maria ZWYSEN；Kristof Pieter Frans Marcelis
    申请人:Atlas Copco Airpower, Naamloze Vennootschap；
    IPC主号:
    专利说明:

    Bearing shield and method for manufacturing a bearing shield.
    The present invention relates to a bearing shield for mounting a bearing for the shaft of a rotor in the housing of a compressor, expander, vacuum pump or the like.
    The housing of a compressor, expander or vacuum pump is usually equipped with an inlet bearing housing and an outlet bearing housing, in which the bearings are provided for bearing the shaft of the rotor. Traditionally, these bearing housings are made of cast iron or cast steel.
    In most cases, the inlet bearing housing or the outlet bearing housing is integrated with the compressor, expander or vacuum pump housing in order to have to cast fewer components.
    Because the casting of a bearing housing is a difficult process that is not easy to adjust, a standard bearing housing is cast for different variants of a compressor instead of producing a specific and optimally adapted inlet and / or outlet bearing housing for each compressor variant.
    Although this can reduce production costs and production time, it has the disadvantage that compromises have to be made and that the characteristics of the bearing housings are never optimal for the compressor or the like. This reduces the efficiency of the compressor that deviates from the design compromise.
    It is therefore an object of the invention to provide a solution for one or more of the aforementioned disadvantages.
    Therefore, the present invention comprises a bearing shield for mounting a rotor bearing in the housing of a compressor, expander, vacuum pump or the like, the bearing shield being made of a metal plate with a bearing bearing for the bearing formed by deep drawing and / or punching the metal plate and / or welding a tube to the metal plate.
    An advantage is that the bearing shield according to the invention can be manufactured more easily and at lower costs in comparison with a conventional cast-iron bearing housing.
    Another advantage is that the bearing shield can be easily adjusted to meet specific requirements of a compressor. Consequently, each compressor variant can be equipped with an inlet and / or outlet bearing housing that is specifically optimized for that variant of compressor, expander, vacuum pump or the like.
    Another advantage is that such a bearing housing makes it possible to integrate specific molded parts of a compressor or the like.
    For example, an air inlet port can be integrated into the bearing shield of a screw compressor. This will allow an axial air inlet instead of a radial air inlet.
    This will allow a simpler design of the screw compressor housing because a radial air inlet does not have to be provided.
    The present invention also relates to a bearing assembly which comprises a bearing shield according to the invention and at least one bearing mounted in the bearing seat with the same advantages as mentioned above.
    The present invention further relates to a method for manufacturing a bearing shield according to the invention for mounting a bearing for the shaft of a rotor in the housing of a compressor, expander, vacuum pump or the like, the method comprising the step of deforming a metal plate into a bearing shield by deep-drawing and / or punching the metal plate and / or by welding a tube on the metal plate so that a bearing seat is formed.
    An advantage of such a method is that it will make it possible to manufacture a bearing shield at lower costs than the usual bearing housings of cast iron or cast steel.
    Furthermore, such a method can easily be adapted to the specific features or moldings required for a compressor, expander, vacuum pump or the like.
    The present invention further relates to a method for bearing the shaft of a rotor in the housing of a compressor, expander, vacuum pump or the like with a bearing, said method comprising the following steps: - mounting at least one bearing in a bearing shield according to the invention; - mounting the bearing with the bearing shield on the housing; and - mounting the rotor in the housing with the axis of the rotor supported in the bearing.
    The present invention further relates to a compressor comprising a housing in which a rotor is mounted, the rotor being mounted in a bearing by means of a bearing shield according to the invention mounted on the housing.
    Two separate bearing shields are preferably used which are mounted on the housing.
    This has the advantage that the housing of the compressor is simpler and easier to manufacture because a bearing housing does not have to be integrated into the housing of the compressor.
    With the insight to better illustrate the features of the invention, the following describes, as an example without limitation, a few preferred embodiments of a bearing shield and a bearing assembly according to the invention, a method for manufacturing such a bearing shield, a method for bearing mounting the shaft of a rotor in the housing of a compressor, expander, vacuum pump or the like and a compressor comprising such a bearing shield, reference being made to the accompanying drawings, in which: figure 1 schematically shows an exploded view of a compressor with a compressor housing equipped with bearing shields according to the invention; figure 2 schematically shows a top view of an embodiment of a bearing shield according to the invention; Figure 3 schematically shows a cross-sectional view of the bearing shield of Figure 2; figures 4 and 5 schematically show a top view and a cross-sectional view of another embodiment of a bearing shield according to the invention; Figure 6 is a variant of the bearing shield of Figure 5; figures 7 and 8 schematically show another embodiment of a bearing shield according to the invention; Figure 9 schematically shows a variant of the bearing shield of Figure 8; Figure 10 schematically shows a variant of the bearing shield of Figure 4 or 7; figures 11 and 12 schematically show variants of a bearing shield according to the invention; Fig. 13 schematically shows an embodiment of a bearing assembly according to the invention; and figure 14 shows schematically another embodiment of a bearing assembly according to the invention.
    The compressor shown in Figure 1 is a screw compressor 1 which comprises a housing 2 with an inlet side 3 and an outlet side 4 and two bearing shields 5, namely a bearing shield 5a and a bearing shield 5b. The two bearing shields 5a, 5b define together with the housing 2 a compressor chamber 6 in which the two screw rotors 7a, 7b are mounted with their shafts 8a, 8b.
    The rotors 7a, 7b have spiral lobes 9 which co-engage with each other and define with the housing 2 and the two bearing shields 5 a gas chamber that will move from the inlet side 3 to the outlet side 4 when the rotors 7a, 7b rotate about an axis X 'and YY', respectively, rotate parallel to their axis 8a, 8b, thereby decreasing in size and compressing the gas trapped therein.
    One of the two bearing shields 5, the inlet bearing shield 5a, is provided on the inlet side 3 of the housing 2, the other, the outlet bearing shield 5b is provided on the outlet side 4 of the housing 2.
    Each bearing shield 5 comprises a bearing seat 10 which is intended for mounting a bearing therein. In this case, two such bearing seats 10 are provided in each bearing shield 5 and in each bearing seat 1 a bearing is mounted, which is not visible in Figure 1.
    The inlet bearing shield 5a is provided with a bearing seat 10 with an open bottom 11.
    The shafts 8a, 8b of the rotors 7a, 7b are mounted in the bearings and the bearing shields 5 are attached to the housing 2 of the compressor 1.
    The shaft 8a of the male rotor 7a on the inlet side 3 is provided in the bearing seat 10 with the open bottom 11 to be able to connect the shaft 8a to a motor or the like for driving the rotors 7a, 7b.
    The bearing shield 5 according to the invention is made of a metal plate 12, with a thickness of, for example, three or four millimeters.
    This has the advantage that a metal plate 12 can be easily processed to produce a bearing shield 5.
    According to the invention, a metal plate 12 is deformed by deep-drawing and / or punching of the metal plate 12 so that the bearing seats 10 are formed.
    According to the invention, it is also possible to manufacture a bearing seat 10 by welding one or more standard tubes to a metal plate 12 or plate. This is preferably achieved by laser welding, which has the advantage that it requires a lower heat supply, which would lead to a better control of the desired shape. Laser cutting can be used to provide the necessary openings for the bearing seats 10 in the metal plate 12.
    The bearing shield 5 can, in addition to the bearing seat 10, be provided with other molded parts depending on the application.
    In the following, some possible moldings will be discussed in more detail and some possible embodiments of the bearing shield 5 shown in Figure 1 will be discussed.
    The bearing shield 5 shown in Figures 2 and 3 corresponds to the bearing shield 5 of Figure 1, but is furthermore provided with centering means 13.
    In this case, these centering means are in the form of two dowel holes 14. It is clear that any number of dowel holes 14 is possible.
    By providing these dowel holes 14 at the suitable places, they will make it possible to perfectly align the bearing shield 5 with the aid of dowel pins relative to the housing 2.
    It is also possible to provide a centering edge instead of dowel holes 14.
    The centering means 13 can be provided during the manufacture of the bearing shield 5, wherein the dowel holes 14 can be provided, for example, by punching and / or laser cutting.
    Figures 4, 5 and 6 show other preferred embodiments that will make it possible to align the bearing shield 5 with the housing 2 if the housing 2 does not allow the use of dowel pins due to its construction.
    In these embodiments, the metal plate 12 or plate is bent into a shape 15 that fits with the internal or external contour of the housing 2, more particularly the internal or external contour on the inlet side 3 or the outlet side 4 of the housing 2 on which the bearing shield 5 will be mounted.
    Bending the metal plate 12 into a mold 15 that fits with the outer contour, as shown in Figs. 4 and 5, has the advantage that the mold 15 is simpler.
    In the case of milled rotor bores, however, the internal contour has the advantage that the rotor bores are already milled and are therefore very accurate, which allows a very accurate alignment of the bearing shield 5 with respect to the housing 2. Figure 6 shows a bearing shield 5 formed in a shape 15 that fits with the inner contour.
    Figure 7 shows a bearing shield 5 which is provided with specific compressor moldings, in this case a horizontal oil channel 16a which is oriented in the plane of the metal plate 12.
    The oil channel 16 can be realized, for example, by an elongated indentation 16 which forms the oil channel 16 with a neighboring piece 17 or element of the compressor 1.
    This is shown in Figure 8, in which the adjacent piece 17 is an additional metal plate 12, which in this case can be placed between the housing 2 and the bearing shield 5.
    The elongated indentation 16 can be formed by deep-drawing and / or punching during the manufacture of the bearing shield 5.
    The oil channel 16 can be used to connect two oil channels that arrive at the bearing shield 5.
    It is also possible to provide an oil channel which is perpendicular to the plane of the metal plate 12, for example by welding a tube to the metal plate 12. It is also possible to integrate this tube 18 in the housing 2, as shown in figure 9.
    In this figure a bearing shield 5 is shown which is provided with a vertical oil channel 16b which is oriented in the plane of the metal plate 12.
    By combining this vertical oil channel 16b which is realized by an elongated indentation 16b, and the tube 18 perpendicular to the plane of the metal plate 12, an oil channel 16b, 18 with an angle can be realized.
    In this case, two metal plates 12 are combined. This second metal plate 12 can be used as the adjacent piece 17 to form a vertical oil channel 16b in combination with the elongated indentation 16b.
    It is also possible to provide further specific compressor functions in addition to one or more oil channels 16, as shown in figures 10 to 12.
    Figure 10 shows a bearing shield 5, more particularly an inlet bearing shield 5a, which is provided with various openings 19 around bearing seat 10, which together form an air inlet port 20.
    The air inlet port 20 has a sickle shape in this case. This has the advantage that an axial air inlet can be provided instead of a radial air inlet.
    The openings can for instance be realized by punching and / or laser cutting.
    Figures 11 and 12 both show a bearing shield 5, in particular an outlet bearing shield 5b, which is provided with an air outlet port 21, which can be realized by punching and / or laser cutting during the manufacture of the bearing shield 5.
    The shape of the air outlet port 21 will determine at which phase or at which position of the rotors 7a, 7b the air in the gas chamber can leave the compression chamber 6 at the outlet side 4.
    By punching or laser cutting the air outlet port 21, the possibility arises of using different shapes for different outlet bearing shields 5b in order to obtain different internal pressure ratios for the different compressor variants.
    It is also possible to provide one or more reinforcing ribs, which can for instance be provided by deep-drawing and / or punching of local indentations, during the manufacture of the bearing shield 5.
    Figure 13 shows a bearing assembly 22 according to the invention, wherein this bearing assembly 22 comprises a bearing shield 5 according to the inlet bearing shield 5a of Figure 1.
    According to the invention, bearings 23 are mounted in the bearing seats 10 of the bearing shield 5.
    The bearings 23 are preferably secured in the bearing seat 10 by a press fit.
    In this case, a lip seal 24 is provided in the bearing seat 10 with the open bottom 11. For this reason, this bearing seat 10 is made deeper in order to accommodate the lip seal 24.
    This lip seal 24 will seal the shaft 8a of the male rotor 7a, which runs through the open bottom 11 of the respective bearing seat 10, to prevent gas or lubricant from escaping through the open bottom 11.
    Figure 14 shows another bearing assembly 22, which includes the outlet bearing shield 5b of Figure 1. In this case, no lip seal 24 is present, but the bearing assembly 22 is provided with blocking means 25 to prevent the bearings from coming off the bearing seats 10.
    The blocking means 25 are in this case in the form of two clamping bushes 25, which are provided after the bearings 23 have been mounted.
    The clamping bushes 25 also fulfill a sealing function because they will prevent compressed gas from escaping via the bearing seats 10 and the rotor shafts 8a, 8b at the outlet side 4 of the housing 2.
    Bearing a shaft 8a, 8b of a rotor 7a, 7b or the like in a housing 2 of a compressor 1 or the like using an inlet bearing shield 5a and an outlet bearing shield 5b according to the invention is easy and this is carried out as follows.
    In a first step, bearings 23 are mounted in the bearing seats 10 of a bearing shield 5. the number of bearing seats 10 and the number of bearings 23 depend on the application.
    During this step, the bearings 23 are preferably secured in the bearing seat 10 by press fit.
    If required, one or more lip seals 24 in the bearing seat 10 can be provided before the step of mounting the bearing 23 in the bearing seat 10.
    In a subsequent step, in the case of the outlet bearing shield 5b, one or more clamping bushes 25 or other blocking means 25 can be provided to prevent the bearings 23 from coming off the bearing seats 10.
    As explained above, it is also possible that these clamping sleeves 25 have a sealing function.
    Both bearing assemblies 22, consisting of the bearing shield 5, the bearings 23, the lip seals 24 and / or the clamping bushes 25, can then be mounted on the housing 2 in the known manner.
    The outlet bearing assembly 22 can, for example, first be mounted on the outlet side 4 of the housing 2.
    In order to align the bearing assembly 22 with respect to the housing 2, use can be made of dowel holes 14 and / or a centering edge when they are provided in the bearing shield 5.
    The rotor 7a, 7b can be mounted in the housing 2 and one of its shafts 8a, 8b can be carried in the bearings 23. The clamping sleeves 25 will provide a sealing function to seal around the shaft 8a, 8b, which means that they will function as a shaft sealing device.
    Subsequently, the inlet bearing shield 5a can be mounted such that the other rotor shaft 8a, 8b is also mounted in the bearings 23 of the inlet bearing shield 5a. In this case, the lip seals 24 will provide the necessary seal around the shaft 8a, 8b.
    Although in all embodiments discussed above, the bearing shields 5 are provided with two bearing seats 10, it is clear that only one bearing seat 10 or more than two bearing seats 10 are within the scope of the invention.
    It is clear that the invention is not limited to screw compressors 1, and that other types of compressors, expanders or vacuum pumps are within the scope of the invention.
    The present invention is not limited in any way to the embodiment described by way of example and shown in the drawings, and such a bearing shield 5 and bearing assembly 22 according to the invention, a method for the manufacture of such a bearing shield 5, a method for mounting the bearings 8a, 8b of a rotor 7a, 7b in bearings 2 in a housing 2 of a compressor 1, an expander, a vacuum pump or the like and a compressor 1 comprising such a bearing shield 5 can be designed in different variants without to leave the scope of the invention.
    权利要求:
    Claims (27)
    [1]
    Conclusions
    1. - Bearing shield for mounting a bearing (23) for the shaft (8a, 8b) of a rotor (7a, 7b) in the housing (2) of a compressor (1), expander, vacuum pump or the like, characterized by the bearing shield (5) is made of a metal plate (12), a bearing seat (10) for the bearing (23) being formed by deep-drawing and / or punching the metal plate (12) and / or by welding a tube to the metal plate (12).
    [2]
    Bearing bearing according to one of the preceding claims, characterized in that it is provided with centering means (13).
    [3]
    Bearing shield according to claim 2, characterized in that the centering means (13) comprise one or more dowel holes (14) and / or one or more centering edges.
    [4]
    Bearing shield according to one of the preceding claims, characterized in that the metal plate (12) is bent into a shape (15) that fits with an internal and / or external contour of the housing (2).
    [5]
    Bearing bearing according to one of the preceding claims, characterized in that it is provided with one or more air inlet ports (20) and / or one or more air outlet ports (21).
    [6]
    Bearing bearing according to one of the preceding claims, characterized in that it is provided with one or more oil channels (16a, 16b).
    [7]
    Bearing bearing according to claim 5 or 6, characterized in that the air inlet port (20) and / or the air outlet port (21) and / or the oil channel (16a, 16b) are realized by deep drawing and / or punching and / or laser cutting .
    [8]
    Bearing bearing according to one of the preceding claims, characterized in that it is provided with one or more reinforcing ribs.
    [9]
    A bearing assembly comprising a bearing shield according to any of the preceding claims and at least one bearing (23) mounted in the bearing seat (10).
    [10]
    Bearing assembly according to claim 9, characterized in that the bearing (23) is fixed in the bearing shield (5) by press fit.
    [11]
    The bearing assembly according to claim 9 or 10, characterized in that it comprises at least one lip seal (24) for sealing the shaft (8a, 8b).
    [12]
    Bearing assembly according to one of the preceding claims 9 to 11, characterized in that it is provided with blocking means (25) to prevent the bearing (23) from coming off the bearing seat (10).
    [13]
    Bearing assembly according to claim 12, characterized in that the blocking means (25) comprise at least one clamping bush (25).
    [14]
    Bearing assembly according to claim 13, characterized in that this clamping bush (25) also fulfills a sealing function.
    [15]
    15. - Method for manufacturing a bearing shield (5) for mounting a bearing (23) for the shaft (8a, 8b) of a rotor (7a, 7b) in the housing (2) of a compressor (1) , expander, vacuum pump or the like, characterized in that it comprises the step of deforming a metal plate (12) into a bearing shield (5) by deep-drawing and / or punching the metal plate and / or welding a tube on the de metal plate to form a bearing seat (10).
    [16]
    Method according to claim 14, characterized in that it comprises the step of providing centering means (13) on the bearing shield.
    [17]
    Method according to claim 15 or 16, characterized in that it comprises the step of bending the metal plate (12) into a shape (15) that fits with an internal or external contour of the housing (2).
    [18]
    Method according to one of the preceding claims 15 to 17, characterized in that it comprises the step of creating openings (19) or indentations in the metal plate (12) for realizing one or more air inlet ports (20) and / or one or more air outlet ports (21) and / or one or more oil channels (16a, 16b) by deep drawing and / or punching and / or laser cutting the metal plate (12).
    [19]
    Method according to one of the preceding claims 15 to 18, characterized in that it comprises the step of providing one or more reinforcing ribs on the metal plate (12) by local indentations formed by deep drawing and / or punching.
    [20]
    20. - Method for bearing a shaft (8a, 8b) of a rotor (7a, 7b) in a housing (2) of a compressor (1), expander, vacuum pump or the like by means of a bearing (23), characterized in that it comprises the following steps: - mounting at least one bearing (23) in a bearing shield (5) according to one of the preceding claims 1 to 8; - mounting the bearing (23) with the bearing shield (5) on the housing (1); - mounting the rotor (7a, 7b) in the housing (1) with the shaft (8a, 8b) of the rotor (7a, 7b) supported in the bearing (23).
    [21]
    Method according to claim 20, characterized in that during the step of mounting the bearing (23) in the bearing shield (5) the bearing is fixed by press fit into a bearing seat (10) of a bearing shield (5).
    [22]
    Method according to claim 20 or 21, characterized in that the method comprises the step of providing at least one lip seal (24) in the bearing seat (10) before mounting the bearing (23) in the bearing shield (5) for sealing the shaft (8a, 8b).
    [23]
    Method according to one of the preceding claims 20 to 22, characterized in that the method after mounting the bearing (23) in a bearing shield (5) comprises the step of providing blocking means (25) that prevent the bearing (23) comes loose from the bearing seat (10).
    [24]
    Method according to one of the preceding claims 20 to 23, characterized in that it further comprises the step of mounting the other shaft (8a, 8b) of the rotor (7a, 7b) in a bearing by mounting a second bearing shield (5) according to claims 1 to 10 on the housing (2) wherein this other shaft (8a, 8b) is placed in the bearing (23) of the second bearing shield (5).
    [25]
    Device - comprising a housing (2) in which a rotor (7a, 7b) is mounted, characterized in that the rotor (7a, 7b) is mounted by means of a bearing shield (5) according to one of the preceding claims 1 to 8, which is mounted in the housing (2).
    [26]
    Device according to claim 25, characterized in that the rotor (7a, 7b) is mounted by means of two separate bearing shields (5a, 5b) mounted in the housing (2).
    [27]
    Device - according to claim 25 or 26, characterized in that the device comprises a compressor, an expander and / or a vacuum pump.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US6106155A|1998-02-10|2000-08-22|Skf Gmbh|Bearing plate|
    DE10328199A1|2003-06-24|2005-01-13|Ab Skf|Method for fabricating molding for directly or indirectly accommodating bearing ring, requires supporting of molding on second face opposite first face by matrix|
    DE102004003662B3|2004-01-24|2005-04-21|Aktiebolaget Skf|Housing with inner and outer races for ball bearing has mounting ring fitted onto profiled outer surface of outer race and welded into central opening of triangular flange|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US201261718837P| true| 2012-10-26|2012-10-26|
    US61/718837|2012-10-26|PCT/BE2013/000056| WO2014063207A1|2012-10-26|2013-10-24|Bearing shield and method for manufacturing a bearing shield|
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