• 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:
    High pressure multistage centrifugal compressor containing at least three compressor elements, as well as at least two motors for driving the elements, at least one element being arranged in series with another element, each of the aforementioned motors driving one of the aforementioned elements in series, wherein a first of the aforementioned engines also drives a third element and wherein the compressor is provided with a fourth compressor element which is driven by the second engine and which is connected with its inlet or outlet to the inlet or outlet of an element driven by the first motor.
    公开号:BE1019254A3
    申请号:E201000180
    申请日:2010-03-25
    公开日:2012-05-08
    发明作者:
    申请人:Atlas Copco Airpower Nv；
    IPC主号:
    专利说明:

    High pressure multistage centrifugal compressor.
    The present invention relates to a high pressure multistage centrifugal compressor.
    More specifically, the invention relates to such high-pressure multi-stage centrifugal compressor comprising at least three compressor elements, each comprising at least one rotor body mounted on a rotor shaft in a stator housing with an inlet and an outlet, as well as at least two electric motors for driving the rotor shaft of the compressor elements, wherein each of the three compressor elements is coupled at least with its inlet or outlet to the inlet or outlet of one of the other compressor elements.
    Even more specifically, the invention relates to a aforementioned high-pressure multi-stage centrifugal compressor, wherein at least one compressor element is arranged in series with another compressor element to form a high pressure stage in that it is connected with its inlet to the outlet of the other compressor element and wherein each of the aforementioned electric motors drives the rotor shaft of one of the aforementioned compressor elements in series and wherein a first of the aforementioned electric motors also drives another of the three compressor elements.
    BE 2000/0596, for example, already discloses such a high-pressure multi-stage centrifugal compressor, in which case three centrifugal compressor elements are connected to each other in series to form a three-stage compressor.
    An advantage of these known high-pressure multi-stage centrifugal compressors is that high pressure ratios can be achieved, whereby the drive motors for driving the rotor shafts can run at relatively lower speeds compared to a single-stage compressor with the same pressure ratio.
    This makes it possible to use motors that are easier to construct, which also implies a significant reduction in construction costs.
    In addition, the so-called Mach number losses (shock losses) are limited by the multi-stage version.
    In the known high pressure multistage centrifugal compressors of the aforementioned type, it is also generally sought to work with electric motors which are completely identical in order to keep the number of parts limited, which also contributes to an easy maintenance and a limitation of the number of spare parts.
    A drawback of the known high-pressure multi-stage centrifugal compressors of the aforementioned type, however, is that it is not easy to obtain a uniform load distribution between the two electric motors.
    Yet another disadvantage of the known high-pressure multistage centrifugal compressors of the aforementioned type is that the dimensions of the compressor element on the suction side are disproportionately much larger than with the compressor elements of the subsequent stages, since for a constant flow through the compressor there on the suction side, where the air has not yet been compressed, much larger volumes must be included than in the following stages.
    The present invention therefore has for its object to offer a solution to one or more of the aforementioned and other disadvantages.
    To this end the present invention relates to a high pressure multistage centrifugal compressor of the type described above which is provided with a fourth compressor element which is driven by the other second electric motor and which fourth compressor element is connected with its inlet or outlet to the inlet or outlet of a compressor element driven by the aforementioned first electric motor.
    A first advantage of such a high-pressure multi-stage centrifugal compressor according to the invention, in which four compressor elements are driven by two electric motors, is that the load over the two electric motors can be more evenly distributed in a simpler manner than with the known multi-stage compressors, since each of the electric motors drives the rotor shafts of two of the four compressor elements.
    Yet another important aspect of such a high-pressure multistage centrifugal compressor according to the invention is that the fourth compressor element driven by the second electric motor is connected to a compressor element driven by the first electric motor.
    This creates a form of feedback between the loads through which each of the two electric motors is loaded, which can again contribute to a more even distribution of the loads of the electric motors.
    According to a preferred embodiment of a high-pressure multi-stage centrifugal compressor according to the invention, at least two of the four aforementioned compressor elements are connected in parallel because their respective outlets are connected to each other.
    Such an embodiment is especially advantageous in cases where two low pressure stages at the compressor's input are connected in parallel in the aforementioned manner, since in this way a larger flow of uncompressed air can be absorbed with compressor elements having a relatively smaller dimension than when the same flow rate must be assured with only one compressor element.
    According to yet another preferred embodiment of a high-pressure multistage centrifugal compressor according to the invention, three of the aforementioned compressor elements are arranged in series to form three consecutive stages of the compressor, in particular a first compressor element that forms a low pressure stage, a second compressor element comprising a intermediate stage and a third compressor element that forms a high pressure stage.
    By placing three compressor elements in series, high pressure ratios can be achieved in a simple manner.
    An extremely interesting embodiment consists of combining the features of the last two mentioned embodiments, wherein a fourth compressor element is connected in parallel to the first compressor element to extend the aforementioned low-pressure stage.
    Preferably, according to the invention, the rotor shaft of the two aforementioned compressor elements, which are connected in parallel, is each driven by a different one of the aforementioned two electric motors.
    As a result, a favorable distribution of the load on the two electric motors can again be obtained, while large amounts of uncompressed air with relatively small dimensions of the compressor elements can be received at the inlet of the compressor.
    With the insight to better demonstrate the features of the invention, a few preferred embodiments of a high-pressure multi-stage centrifugal compressor according to the invention are described below as an example without any limiting character, with reference to the accompanying figure, in which: figure 1 schematically shows the most preferred embodiment of a high pressure multistage centrifugal compressor according to the invention.
    The high-pressure multistage centrifugal compressor 1 according to the invention shown in Figure 1 is composed of four compressor elements 2 to 5 and two electric motors, more particularly a first electric motor 6 and a second electric motor 7.
    The compressor elements 2 to 5 are of the centrifugal type and each consist of a rotor body 8 mounted on a rotor shaft 9 in a stator 10.
    Each compressor element 2 to 5 is furthermore provided with an inlet 11 which extends axially and an outlet 12 which is radially oriented, wherein each of the compressor elements 2 to 5 is coupled at least with its inlet 11 or its outlet 12 to the inlet 11 or the outlet 12 of one of the other compressor elements 2 to 5.
    In the shown example of figure 1, more specifically, the three compressor elements 2, 3 and 4 are arranged in series to form three consecutive pressure stages of the compressor 1.
    The first compressor element 2 herein forms a low pressure stage at the input of the compressor 1, wherein uncompressed air is drawn in at the inlet 11 of the compressor element 2.
    The second compressor element 3 is connected via a conduit 13 with its inlet 11 to the outlet 12 of the first compressor element 2 to form an intermediate pressure stage of the compressor 1.
    Similarly, the third compressor element 4 is connected by means of a conduit 13 with its inlet 11 to the outlet 12 of the second compressor element 3 to form a high pressure stage of the compressor 1.
    The outlet 12 of the third compressor element 4 forms the outlet of the compressor 1 for discharging air compressed in the compressor 1.
    According to the invention, an intermediate cooler 14 is preferably provided between at least two compressor elements arranged in series, which form successive pressure stages of the compressor 1.
    Most preferably, as in the shown embodiment of Figure 1, such intermediate cooler 14 is provided in the lines 13 between each pair of compressor elements 2 to 4 arranged in series.
    Such intermediate cooler 14 may, for example, consist of a radiator through which the compressed gas flows and which is cooled, for example, by ambient air supplied by a fan. Another possibility is, for example, to cool the compressed gas with a secondary cooling circuit through which cooling water flows.
    In the embodiment of Figure 1 shown, the fourth compressor element 5 is further connected in parallel to the first compressor element 2, more particularly the outlet 12 of the fourth compressor element 5 being connected with a conduit 13 to the outlet 12 of the first compressor element 2.
    In this way, the low pressure stage of the compressor 1 is in fact doubled, the inlet 11 of the first compressor element 2 and the inlet 11 of the fourth compressor element 5 together forming the suction side of the compressor 1.
    Thus, the requirements imposed on each of the compressor elements 2 and 5 are less far-reaching than if only one compressor element were used to suck in the same amount of gas at the input of the compressor 1.
    Each of the electric motors 6 and 7 is coupled with its motor shaft to a rotor shaft 9 of one of the compressor elements placed in series.
    More specifically, the second electric motor 7 drives the third compressor element 4, while the first electric motor 6 drives the second compressor element 3 which is connected in series to the third compressor element 4.
    Furthermore, the first electric motor 5 also drives the first compressor element 2.
    Characteristic of the invention is that a fourth compressor element 5 is provided which is also driven by the second electric motor 7, wherein this fourth compressor element 5 also influences the load of the first electric motor 6 in a certain sense, since the outlet 12 of the fourth compressor element 5 is connected to the outlet 12 of the first compressor element 2 which is driven by the first electric motor 6.
    This means that the two electric motors 6 and 7 together ensure the pressure build-up at the output of the low pressure stage.
    According to the invention, at least one of the electric motors 6 and 7 is preferably a high-speed motor and most preferably even both electric motors 6 and 7 are high-speed motors.
    High-speed motors are characterized by a code number M = P.N2 that is greater than or equal to 0.1.10, where P is the motor power, expressed in kW, and N is the speed, expressed in revolutions per minute.
    Still another preferred feature of the invention is the use of electric motors 6 and 7 which are identical, in other words, both the electromagnetic stator section and the bearings, as well as the cooling of the electric motors 6 and 7 are of identical design .
    In order to avoid large friction losses and the like more, it is also according to the invention that the rotor shaft 9 of a compressor element 2 to 5 is preferably directly connected to a drive shaft of one of the electric motors 6 and 7, without using a intermediate gear transmission.
    According to the invention, all kinds of other embodiments are also not excluded.
    For example, it is possible to connect at least two of the four compressor elements 2 to 5 in parallel to each other by connecting their respective inlets 11 to each other.
    In this way, for example, a compressor 1 according to the invention can be obtained with several outputs, for example with the intention of being able to serve different consumers or the like.
    The aforementioned ways of connecting compressor elements 2 to 5 in parallel, either by coupling their inlet 11 or coupling their outlet 12, can of course also be combined.
    For example, it is not excluded that a high pressure multistage centrifugal compressor can be configured such that two of the four aforementioned compressor elements 2 to 5 are connected in parallel by connecting their respective inlets 11 to each other and the two other of the aforementioned four compressor elements 2 to 5 are connected in parallel. by connecting their respective outlets 12 to each other.
    Nor are all possible combinations excluded from the invention in which certain compressor elements 2 to 5 are coupled in series to each other (by coupling an outlet 12 to an inlet 11, respectively) and in which other of these compressor elements 2 to 5 are coupled in parallel to each other.
    The rotor shafts 9 of the compressor elements 2 to 5 can also be driven in other ways than shown in Figure 1.
    For example, it is not excluded that the 9 rotor shaft of two compressor elements 2 to 5 which are connected in parallel can each be driven by the same of the two electric motors 6 or 7.
    A high pressure multistage centrifugal compressor in which all four of the aforementioned compressor elements 2 to 5 are arranged in series to form four successive stages of the compressor 1 is quite possible.
    To achieve a uniform load distribution of the electric motors, for this purpose it is possible, for example, to select an arrangement in which the first electric motor 6 drives a first, low-pressure compressor element and a third compressor element of the third pressure stage of the compressor, while the second electric motor second compressor element, as well as the fourth compressor element of the last stage.
    It is clear that numerous other combinations are possible.
    The invention is by no means limited to the embodiment of a high-pressure multi-stage centrifugal compressor 1 according to the invention described as an example and shown in the figure, but such high-pressure multi-stage centrifugal compressor 1 can be realized in all sorts of other ways without departing from the scope of the invention .
    权利要求:
    Claims (16)
    [1]
    A high pressure multistage centrifugal compressor comprising at least three compressor elements (2-5), each comprising at least one rotor body (8) mounted on a rotor shaft (9) in a stator housing (10) with an inlet (11) and an outlet (12), as well as at least two electric motors (6, 7) for driving the rotor shaft (9) of the compressor elements (2-5), each of the three compressor elements (2-5) having at least its inlet (11) ) or its outlet (12) is coupled to the inlet (11) or outlet (12) of another compressor element (2-5), wherein at least one compressor element (4) is arranged in series with a high pressure stage another compressor element (3) in that it is connected with its inlet (11) to the outlet (12) of the other compressor element (3), each of the aforementioned electric motors (6, 7) driving the rotor shaft (9) of one of the aforementioned compressor elements (3, 4) which are in series, a first of the aforementioned el electric motors (6) also drives another of the three compressor elements (2), characterized in that the high-pressure multistage centrifugal compressor (1) is provided with a fourth compressor element (5) which is driven by the other, second electric motor ( 7) and is connected with its inlet (11) or outlet (12) to the inlet (11) or outlet (12) of a compressor element (2-5) which is driven by the aforementioned first electric motor (6).
    [2]
    High-pressure multi-stage centrifugal compressor according to claim 1, characterized in that at least two (2.5) of the four aforementioned compressor elements (2-5) are connected in parallel because their respective outlets (12) are connected to each other.
    [3]
    High-pressure multistage centrifugal compressor according to claim 1 or 2, characterized in that at least two of the four aforementioned compressor elements (2-5) are connected in parallel because their respective inlets (11) are connected to each other.
    [4]
    High-pressure multistage centrifugal compressor according to claims 2 and 3, characterized in that two of the four aforementioned compressor elements (2-5) are connected in parallel because their respective inlets (11) are connected to each other and the other two of the aforementioned four compressor elements ( 2-5) are connected in parallel because their respective outlets (12) are connected to each other.
    [5]
    High-pressure multistage centrifugal compressor according to one of claims 2 to 4, characterized in that the rotor shaft (9) of two aforementioned compressor elements (2-5) which are connected in parallel each by a different one of the aforementioned two electric motors (6, 7) is powered.
    [6]
    High-pressure multistage centrifugal compressor according to one of claims 2 to 5, characterized in that the rotor shaft (9) of two aforementioned compressor elements (2-5) which are connected in parallel each by one of the aforementioned two electric motors (6,7) ) is powered.
    [7]
    High-pressure multistage centrifugal compressor according to one of the preceding claims, characterized in that three of the aforementioned compressor elements (2-4) are arranged in series to form three consecutive stages of the compressor (1), in particular respectively a first compressor element ( 2) forming a low pressure rap, a second compressor element (3) forming an intermediate stage and a third compressor element (4) forming a high pressure stage.
    [8]
    High-pressure multi-stage centrifugal compressor according to claims 2, 5 and 8, characterized in that a fourth compressor element (5) is connected in parallel to the first compressor element (2) to extend the aforementioned low-pressure stage.
    [9]
    High-pressure multistage centrifugal compressor according to claim 7, characterized in that all four of the aforementioned compressor elements (2-5) are arranged in series to form four consecutive stages of the compressor (1).
    [10]
    High-pressure multistage centrifugal compressor according to one of claims 7 to 9, characterized in that an intermediate cooler (14) is provided between at least two compressor elements arranged in series, which form successive stages of the compressor.
    [11]
    High-pressure multistage centrifugal compressor according to one of claims 7 to 9, characterized in that an intermediate cooler (14) is provided between each pair of series-arranged compressor elements (2-5) forming successive stages of the compressor (1).
    [12]
    High-pressure multistage centrifugal compressor according to one of the preceding claims, characterized in that at least one of the electric motors (6,7) is a high-speed motor.
    [13]
    High-pressure multi-stage centrifugal compressor according to claim 12, characterized in that both electric motors (6, 7) are high-speed motors.
    [14]
    High-pressure multistage centrifugal compressor according to one of the preceding claims, characterized in that the two electric motors (6, 7) are identical.
    [15]
    High-pressure multi-stage centrifugal compressor according to one of the preceding claims, characterized in that the rotor shaft (9) of at least one of the four compressor elements (2-5) is directly coupled to a drive shaft of one of the electric motors (6,7) , without intermediate gear transmission.
    [16]
    High-pressure multistage centrifugal compressor according to claim 15, characterized in that the rotor shaft (9) of all compressor elements (2-5) is directly coupled to a drive shaft of one of the two electric motors (6,7), without intermediate gear transmission.
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    同族专利:
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    引用文献:
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    US20030175128A1|2000-09-19|2003-09-18|Fabry Erik Paul|High-pressure multi-stage centrifugal compressor|
    US20070065300A1|2005-09-19|2007-03-22|Ingersoll-Rand Company|Multi-stage compression system including variable speed motors|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US27204109P| true| 2009-08-11|2009-08-11|
    US27204109|2009-08-11|PCT/BE2010/000054| WO2011017783A2|2009-08-11|2010-07-29|High-pressure multistage centrifugal compressor|
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