• 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:
    The fluid machine comprises a stationary element (6), a rotating element (5) and a labyrinth seal (9) having a succession of stationary steps (11) formed on the stationary element (6) and a succession of rotary steps (14) formed on the rotary member (5). The labyrinth seal (9) further comprises a plurality of stationary recesses (18) each formed in a radial wall portion (12) of a respective stationary step (11) and a plurality of rotary recesses (21) formed each in a radial wall portion (16) of a respective rotary step (14). Each stationary step (11) defines a stationary projection (19) delimited by the stationary recess (18) formed on said stationary step (11) and each rotary step (14) defines a rotary projection (22) delimited by the rotary recess (21) formed on said rotary step (14). The axial width (Wr) of each of the stationary recesses (18) and the rotary recesses (21) is substantially equal to the axial width (Wp) of each of the stationary projections (19) and the rotary projections (22).
    公开号:FR3037117A1
    申请号:FR1555135
    申请日:2015-06-05
    公开日:2016-12-09
    发明作者:Patrice Bonnefoi；Nicolas Nouyrigat；Yves Rosson；Arnaud Daussin
    申请人:Danfoss Commercial Compressors SA；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to a fluid machine, for example a centrifugal compressor, having a labyrinth seal defined between a rotary member and a stationary member of the fluid machine and configured to minimize fluid flow. between a high pressure section and a low pressure section formed inside a casing of the fluid machine. Background of the invention US5244216 discloses a fluid machine comprising: - a housing, - a rotating shaft located inside the housing, - a stationary element connected to the housing, - a rotary element connected to the rotary shaft, and - a labyrinth seal configured to minimize or regulate a flow of fluid through the labyrinth seal, the labyrinth seal comprising: - a succession of stationary steps formed on the stationary member, each stationary step having a radial wall portion extending substantially parallel to a longitudinal axis of the rotary shaft and an axial wall portion extending substantially perpendicular to the longitudinal axis of the rotary shaft; - a succession of rotary steps formed on the rotary shaft; rotary member, each rotary step having a radial wall portion extending substantially parallel to the longitudinal axis of the rotary shaft and a with an axial wall extending substantially perpendicular to the longitudinal axis of the rotary shaft; - a plurality of stationary recesses, each stationary recess being formed in the radial wall portion of a respective stationary step, each step; stationary device defining a stationary projection delimited by the stationary recess formed on said stationary step and the axial wall portion of said stationary step, and - a plurality of rotary recesses, each rotary recess being formed in the radial wall portion of said stationary step a respective rotary step and adjacent to the axial wall portion of an adjacent rotary step located upstream of said respective rotary step, each rotary step defining a rotary projection delimited by the rotary recess formed on said rotary step and by the axial wall portion of said rotary step. Such a configuration of the labyrinth seal induces "obstacles" and restrictions to the leakage flow and thereby reduces fluid leakage through the labyrinth seal. However, such a labyrinth seal has complicated shaped cavities and flow passages, which reduce the number of stationary and rotatable steps available over a given axial sealing length, and which are complicated to manufacture. In addition, such a labyrinth seal requires an axial orientation and a very precise assembly between the stationary and rotating elements. In addition, the configuration of such a labyrinth seal would be too fragile to be transferred to small and compact fluid machines.
    [0002] SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid machine having an improved labyrinth seal which can overcome the disadvantages encountered with conventional labyrinth seals. Another object of the present invention is to provide a robust, efficient and easy-to-manufacture labyrinth seal having a simple design which allows substantial tolerances on axial dimensions of the stationary and rotating members and a significant relative axial displacement between the stationary members. and rotary. This is particularly important in very small and compact fluid machines, where the total axial length of the labyrinth seal is a few millimeters and therefore the axial length of each step is a few hundred microns. According to the invention, such a fluid machine comprises: - a housing, - a rotary shaft located inside the housing, a stationary element connected to the housing, a rotary element connected to the rotary shaft, - a gasket a labyrinth configured to minimize or regulate a flow of fluid through the labyrinth seal, the labyrinth seal comprising: a succession of stationary steps formed on the stationary member, each stationary step of said succession of stationary steps comprising a stationary step; radial wall portion extending substantially parallel to a longitudinal axis of the rotary shaft and an axial wall portion extending substantially perpendicular to the longitudinal axis of the rotary shaft, - a succession of steps rotary steps formed on the rotary member, each rotary step of said succession of rotary steps having a radially extending wall portion substantially parallel to the longitudinal axis of the rotary shaft and an axial wall portion extending substantially perpendicular to the longitudinal axis of the rotary shaft; a plurality of stationary recesses, each stationary recess of said a plurality of stationary recesses being formed in the radial wall portion of a respective stationary step and adjacent to the axial wall portion of an adjacent stationary step located downstream of said respective stationary step, each stationary step being configured for defining a stationary projection delimited by the stationary recess formed on said stationary step and the axial wall portion 20 of said stationary step, and - a plurality of rotary recesses, each rotary recess of said plurality of rotary recesses being formed in the radial wall portion of a respective rotary step and in an adjective manner said rotary step being configured to define a rotary projection delimited by the rotary recess formed on said rotary step and by the wall portion; axial axis of said rotary step, wherein the axial width of each of the stationary recesses and rotary recesses is substantially equal to the axial width of each of the stationary projections and rotary projections. Such a configuration, and in particular such a dimensioning of stationary and rotary recesses and stationary and rotary projections, improves the efficiency and robustness of the labyrinth seal. In addition, such a configuration of stationary and rotary recesses and stationary and rotary projections reduces manufacturing constraints for the manufacture of stationary and rotating elements, and thus reduces the manufacturing cost of the fluid machine. In addition, such a configuration of the labyrinth seal facilitates the assembly of the stationary and rotating members, and reduces the sensitivity to axial movement of the rotating member during assembly and during operation of the fluid machine. In the present patent application, the "downstream" and "upstream" formulations and similar formulations are considered with respect to the direction of fluid flow through the labyrinth seal.
    [0003] The fluid machine may also include one or more of the following features, taken alone or in combination. According to one embodiment of the invention, the labyrinth seal is configured to minimize or regulate fluid flow between a high pressure section and a low pressure section formed within the housing.
    [0004] According to one embodiment of the invention, the radial wall portions and the axial wall portions of the stationary steps and the rotary steps are substantially planar. According to one embodiment of the invention, the radial wall portions of the stationary steps and rotary steps extend parallel to the longitudinal axis of the rotary shaft. According to another embodiment of the invention, the radial wall portions of the stationary steps and the rotary steps extend at an angle of between about -5 degrees and about 5 degrees to the longitudinal axis of the shaft. rotary. According to one embodiment of the invention, the axial wall portions of the stationary steps and the rotary steps extend perpendicular to the longitudinal axis of the rotary shaft. According to another embodiment of the invention, the axial wall portions of the stationary steps and rotary steps extend at an angle of between about 85 degrees and about 95 degrees to the longitudinal axis of the shaft. rotary. According to one embodiment of the invention, the axial width of each of the stationary recesses and rotary recesses is equal to the axial width of each of the stationary projections and rotary projections. According to another embodiment of the invention, the ratio between the axial width of each of the stationary recesses and the rotary recesses and the axial width of each of the stationary projections and the rotary projections is between 0.8 and 1. , 2 or between 0.9 and 1.1. According to another embodiment of the invention, the ratio between the average axial widths of the stationary recesses and rotary recesses and the average axial widths of the stationary projections and rotary projections is between 0.8 and 1.2. or between 0.9 and 1.1. According to one embodiment of the invention, the stationary steps are axially offset from one another and successively arranged along an inner radial surface of the stationary element, and the rotary steps are axially offset from one another and arranged successively along an outer radial surface of the rotary member. According to one embodiment of the invention, the inner radial surface of the stationary element and the outer radial surface of the rotary element are opposite to each other.
    [0005] According to one embodiment of the invention, the stationary steps and the rotary steps are annular. According to one embodiment of the invention, the stationary recesses and the rotary recesses are annular. According to one embodiment of the invention, the stationary projections and the rotary projections are annular. According to one embodiment of the invention, the inner radial surface of the stationary element and the outer radial surface of the rotary element are annular. According to one embodiment of the invention, each stationary projection 25 extends substantially perpendicular to the longitudinal axis of the rotary shaft, and each rotary projection extends substantially perpendicular to the longitudinal axis of the rotary shaft. rotating shaft. According to one embodiment of the invention, each stationary projection is at least partially facing a respective rotary projection.
    [0006] According to one embodiment of the invention, each stationary projection extends radially inwardly towards the respective rotary projection, and each rotatable projection extends radially outwardly towards the respective stationary projection. According to one embodiment of the invention, each stationary projection and the respective rotary projection delimit a flow passage extending substantially parallel to the longitudinal axis of the rotary shaft.
    [0007] According to one embodiment of the invention, each stationary projection comprises an upstream edge and a downstream edge and each rotary projection comprises an upstream edge and a downstream edge, the upstream edge of each stationary projection being axially offset with respect to the edge. upstream of the respective rotary projection 5 by an axial distance. According to one embodiment of the invention, the upstream edge of each stationary projection is axially offset upstream with respect to the upstream edge of the respective rotary projection. According to one embodiment of the invention, the upstream and downstream edges of each stationary projection are sharp, and the upstream and downstream edges of each rotary projection are sharp. According to one embodiment of the invention, the axial distance is greater than the maximum allowed relative axial movement between the rotating element and the stationary element during operation of the fluid machine.
    [0008] According to one embodiment of the invention, each stationary recess at least partially faces a respective rotary recess. According to one embodiment of the invention, the fluid machine further comprises a succession of cavities each having a flow inlet and a flow outlet, each cavity being partially delimited by a stationary recess and a rotary recess, the flow inlet of each cavity being positioned at a location between the respective stationary recess and the axial wall portion of an upstream rotary step. According to one embodiment of the invention, the flow inlet of each cavity faces the axial wall portion of the downstream stationary step.
    [0009] According to one embodiment of the invention, each cavity is further delimited by the axial wall portion of an adjacent stationary step located downstream of said cavity and by the axial wall portion of an adjacent rotary step located in upstream of said cavity. According to one embodiment of the invention, each cavity is annular.
    [0010] According to one embodiment of the invention, the labyrinth seal is configured such that the pressure in a downstream cavity is less than the pressure in an upstream cavity. According to one embodiment of the invention, each stationary recess has a rounded or curved concave bottom and each rotary recess has a rounded or curved concave bottom.
    [0011] According to one embodiment of the invention, the stationary element has a disk shape. According to one embodiment of the invention, the stationary element is constituted of a single piece and is assembled in an axial direction with respect to the rotary element. According to one embodiment of the invention, the stationary element consists of two separate parts and is assembled in a radial direction around the rotary element. According to one embodiment of the invention, the labyrinth seal has a flow inlet located upstream of the cavities and configured to feed the cavities with a fluid flow. According to one embodiment of the invention, the fluid machine is a centrifugal compressor, a turbine or a pump. According to one embodiment of the invention, the rotating member is integrally formed with the rotating shaft. According to one embodiment of the invention, the stationary and rotary steps have substantially the same shape, and the stationary and rotary recesses have substantially the same shape. This configuration makes it possible in particular to manufacture both sides of the labyrinth seal with the same tool.
    [0012] These and other advantages will become apparent upon reading the following description in the light of the accompanying drawing showing, by way of nonlimiting example, an embodiment of a fluid machine in accordance with the present invention. invention.
    [0013] BRIEF DESCRIPTION OF THE DRAWINGS The following detailed description of an embodiment of the invention will be better understood when read in conjunction with the accompanying drawings, it being understood, however, that the invention is not limited to specific embodiment described. Figures 1 and 2 are partial sectional views of a fluid machine according to a first embodiment of the invention. FIG. 3 is a front view of a stationary element of the fluid machine of FIG. 1.
    [0014] Fig. 4 is an enlarged view of a detail of Fig. 1. Fig. 5 is an enlarged view of a detail of Fig. 4.
    [0015] FIG. 6 is a partial sectional view of a fluid machine according to a second embodiment of the invention. FIG. 7 is a front view of a stationary element of the fluid machine of FIG. 6.
    [0016] DETAILED DESCRIPTION OF THE INVENTION In the description which follows, the same elements are designated by the same references in the different embodiments.
    [0017] FIGS. 1 to 5 describe a fluid machine 2, for example a centrifugal compressor, a turbine or a pump, comprising a housing 3 and a rotary shaft 4 rotatably mounted inside the housing 3 and supported in rotation by radial bearings and axial bearings (not shown in the figures). The axial bearings are configured to permit very limited axial movement of the rotary shaft during operation of the fluid machine 2. The fluid machine 2 further comprises a rotatable member 5 attached to the rotary shaft 4, and a stationary element 6 connected to the housing 3 and surrounding the rotary element 5. The housing 3 may for example comprise a fixed support (not shown in the figures) on which the stationary element 6 is fixed.
    [0018] As best shown in FIG. 3, the stationary member 6 has a disc shape and has an inner peripheral surface 7 and an outer peripheral surface 8. According to the embodiment shown in FIGS. 1 to 5, the element stationary 6 is formed in one piece, and is assembled in an axial direction between two parts 5a and 5b of the rotary member 5. The fluid machine 2 further comprises a stepped labyrinth seal 9 configured to minimize or regulating a flow of fluid between a high pressure section 27 and a low pressure section 29 formed inside the housing 3.
    [0019] The labyrinth seal 9 comprises a succession of annular stationary steps 11 axially offset from each other and formed on the inner peripheral surface 7 of the stationary member 6. Each stationary step 11 has an annular radial wall portion 12 extending parallel to the longitudinal axis A of the rotary shaft 4 and an annular axial wall portion 13 extending perpendicularly to the longitudinal axis A of the rotary shaft 4. The radial wall portions 12 and the wall portions Axial 13 of the stationary steps 11 are advantageously substantially planar. The labyrinth seal 9 comprises a succession of annular rotating steps 14 axially offset from each other and formed on an outer peripheral surface 15 of the rotary member 5 which is opposed to the inner peripheral surface 7 of the stationary member 6 and adjacent to it. Each rotary step 14 has an annular radial wall portion 16 extending parallel to the longitudinal axis A of the rotary shaft 4 and an annular axial wall portion 17 extending perpendicularly to the longitudinal axis A of the rotating shaft 4. The radial wall portions 16 and the axial wall portions 17 of the rotary steps 14 are preferably substantially planar. The labyrinth seal 9 also includes a plurality of annular stationary recesses 18 formed on the stationary member 6. Each stationary recess 18 is formed in the radial wall portion 12 of a respective stationary step 11 and adjacent to the axial wall portion 13 of an adjacent stationary step 11 located downstream of said respective stationary step 11. Each stationary recess 18 preferably has a rounded or curved concave bottom.
    [0020] Each stationary step 11 thus defines an annular stationary tooth or projection 19 delimited by the stationary recess 18 formed on said stationary step 11 and by the axial wall portion 13 of said stationary step 11. Each stationary projection 19 extends perpendicularly. to the longitudinal axis A of the rotary shaft 4 and has an upstream edge and a downstream edge. The labyrinth seal 9 also has a plurality of annular rotary recesses 21 formed on the rotary member 5. Each rotary recess 21 is formed in the radial wall portion 16 of a respective rotary step 14 and adjacent to the portion axial wall 17 of an adjacent rotary step 30 upstream of said respective rotary step 14. Each rotary recess 21 preferably has a rounded or curved concave bottom. As best shown in FIG. 5, each rotary recess 21 at least partially faces a respective stationary recess 18. Each rotary step 14 thus defines a tooth or an annular rotary projection 22 delimited by the rotary recess 21 formed on said step rotary projection 14 and the axial wall portion 17 of said rotary step 14. Each rotary projection 22 extends perpendicular to the longitudinal axis A of the axis of rotation A and has an upstream edge and a downstream edge. Each rotatable projection 22 at least partially faces a respective stationary projection 19. In particular, each stationary projection 19 extends radially inwardly towards the respective rotatable projection 22 and each rotatable projection 22 extends radially inwardly. the outside in the direction of the respective stationary projection 19. In addition each stationary projection 19 and the respective rotary projection 22 define an annular flow passage 23 extending parallel to the longitudinal axis A of the rotary shaft 4.
    [0021] As best shown in FIG. 5, the upstream edge of each stationary projection 19 is axially offset upstream from the upstream edge of the respective rotary projection 22 by an axial distance D. Advantageously, the axial distance D is greater than the maximum permissible axial movement of the rotary member 5 during the operation of the fluid machine.
    [0022] Furthermore, as shown in FIG. 5, the axial width W r of each of the stationary recesses 18 and the rotary recesses 21 is substantially equal to the axial width W p of each of the stationary projections 19 and the rotary projections 22. The fluid machine 2 further comprises a succession of annular cavities 24 each having a flow inlet 25 and a flow outlet 26. The flow outlet 26 and the flow inlet 25 of two adjacent cavities are fluidly connected by a Each cavity 24 is delimited by a stationary recess 18, a rotary recess 21, the axial wall portion 13 of an adjacent stationary step 11 located downstream of said cavity 24 and by the wall portion. axial 17 of an adjacent rotary step 14 located upstream of said cavity 24. The flow inlet 25 of each cavity 24 is positioned at a location between the recess statio and the respective axial wall portion 17 and faces the respective axial wall portion 13. The fluid machine 2 further comprises a high pressure chamber 27 defined by the rotating and stationary members 5, 6, and upstream of the cavities 24. The labyrinth seal 9 has a flow inlet 28 fluidly connected to the high pressure chamber 27 and configured to feed the cavities 24 with a flow of fluid from the high pressure chamber 27.
    [0023] The fluid machine 2 also comprises a low pressure chamber 29 defined by the rotating and stationary elements 5, 6 and situated downstream of the cavities 24. The labyrinth seal 9 has a flow outlet 31 fluidly connected to the chamber low pressure 29.
    [0024] In use, a flow of fluid enters the first cavity 24, which is adjacent to the high pressure chamber 27, through the flow inlet 28 and the flow inlet 25. said first cavity 24. Since the flow inlet 25 faces the axial wall portion 13 of the downstream stationary gait 11, the flow of fluid strikes said axial wall portion 13. Such an impact generates a first recirculation flow F1 within an upper portion of the first cavity 24, a second recirculation flow F2 within a lower portion of the first cavity 24 and a leakage flow F3 descending to the outlet 26 of the first cavity 24 in a direction substantially parallel to the axial wall portion 13. Due to the change of direction at the flow outlet 26, a third recirculation flow F4 is created at the offset edges of the stationary projection 19 and the rotary projection 22. The third recirculation flow F4 reduces the effective flow area of the leakage flow F3 exiting the cavity 24 at the outlet of the outlet. After passing through the flow passage 23, the leakage flow F3 then enters the second cavity 24 where first, second and third recirculation flows and leakage flow are also generated, and where the leak flow enters the third cavity 24, and so on.
    [0025] Generating a first recirculation flow F1, a second recirculation flow F2, a third recirculation flow F3 and a leakage flow F4 in the successive cavities 24 substantially reduces leakage. fluid through the labyrinth seal 9 and provides a low leakage rate through the labyrinth seal 9.
    [0026] Figures 6 and 7 describe a fluid machine 2 according to a second embodiment of the invention which differs from the embodiment shown in Figures 1 to 5 essentially in that the stationary element 6 consists of two separate parts 6a, 6b, and is assembled in a radial direction about the rotatable member 5, which is embodied as a unitary part.
    [0027] Of course, the invention is not limited to the embodiments described above by way of non-limiting examples but on the contrary it embraces all the embodiments thereof.
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Fluid machine (2) comprising: - a housing (3), a rotary shaft (4) located inside the housing (3), - a stationary element (6) connected to the housing (3), - a rotary element (5) connected to the rotary shaft (4); - a labyrinth seal (9) configured to minimize or regulate a flow of fluid through the labyrinth seal (9), the labyrinth seal (9) comprising: a succession of stationary steps (11) formed on the stationary element (6), each stationary step (11) of said succession of stationary steps (11) having a radial wall portion (12) extending substantially parallel to a longitudinal axis (A) of the rotary shaft (4) and an axial wall portion extending substantially perpendicular to the longitudinal axis (A) of the rotary shaft (4), - a succession of rotary steps (14) formed on the rotary member (5), each rotary step (14) of said succession of rotary steps (14) co comprising a radial wall portion (16) extending substantially parallel to the longitudinal axis (A) of the rotary shaft (4) and an axial wall portion (17) extending substantially perpendicular to the longitudinal axis (A) of the rotary shaft (4), - a plurality of stationary recesses (18), each stationary recess (18) of said plurality of stationary recesses (18) being formed in the radial wall portion (12) of a respective stationary step (11) and adjacent to the axial wall portion (13) of an adjacent stationary step (11) downstream of said respective stationary step (11), each stationary step ( 11) being configured to define a stationary projection (19) delimited by the stationary recess (18) formed on said stationary step (11) and the axial wall portion (13) of said stationary step (11), and - a plurality of rotary recesses (21), each recess rotating (21) of said plurality of rotary recesses (21) being formed in the radial wall portion (16) of a respective rotary step (14) and adjacent to the axial wall portion (17) of a an adjacent rotary step (14) upstream of said respective rotary step (14), each rotary step (14) being configured to define a rotatable projection (22) delimited by the rotary recess (21) formed on said rotary step (14) and by the axial wall portion (17) of said rotary step (14), wherein the axial width (Wr) of each of the stationary recesses (18) and the rotary recesses (21) is substantially equal to the width axial (Wp) of each of the stationary projections (19) and rotary projections (22).
    [0002]
    The fluid machine (2) according to claim 1, wherein the stationary steps (11) are axially offset from one another and arranged successively along an inner radial surface (7) of the stationary member (6). ), and the rotary steps (14) are axially offset from one another and arranged successively along an outer radial surface (15) of the rotary member (5). 15
    [0003]
    Fluid machine (2) according to claim 1 or 2, wherein each stationary projection (19) extends substantially perpendicular to the longitudinal axis (A) of the rotary shaft (4), and each projection The rotary shaft (22) extends substantially perpendicular to the longitudinal axis (A) of the rotary shaft (4).
    [0004]
    The fluid machine (2) according to any one of claims 1 to 3, wherein each stationary projection (19) at least partially faces a respective rotary projection (22). 25
    [0005]
    The fluid machine (2) according to claim 4, wherein each stationary projection (19) and the respective rotary projection (22) define a flow passage (23) extending substantially parallel to the longitudinal axis. (A) of the rotary shaft (4). 30
    [0006]
    The fluid machine (2) according to claim 4 or 5, wherein each stationary projection (19) has an upstream edge and a downstream edge and each rotatable projection (22) has an upstream edge and a downstream edge, the upstream edge. each stationary projection (19) being axially offset from the upstream edge of the respective rotary projection (22) by an axial distance (D). 3037117 15
    [0007]
    The fluid machine (2) according to claim 6, wherein the axial distance (D) is greater than the maximum allowed relative axial movement between the rotary member (5) and the stationary member (6) during the operation of the fluid machine (2). 5
    [0008]
    The fluid machine (2) according to claim 6 or 7, wherein the upstream and downstream edges of each stationary projection are sharp, and the upstream and downstream edges of each rotary projection are sharp. 10
    [0009]
    9. Fluid machine (2) according to any one of claims 1 to 8, wherein each stationary recess (18) at least partially faces a respective rotary recess (21).
    [0010]
    The fluid machine (2) according to any one of claims 1 to 9, further comprising a succession of cavities (24) each having a flow inlet (25) and a flow outlet (26), each cavity (24) being partially delimited by a stationary recess (18) and a rotary recess (21), the flow inlet (25) of each cavity (24) being positioned at a location between the respective stationary recess ( 18) and the axial wall portion (17) of an upstream rotary step (14).
    [0011]
    The fluid machine (2) according to claim 10, wherein the flow inlet (25) of each cavity (24) faces the axial wall portion (13) of the downstream stationary step (18). 25
    [0012]
    The fluid machine (2) according to any one of claims 1 to 11, wherein the fluid machine (2) is a centrifugal compressor, a turbine or a pump. 30
    [0013]
    13. Fluid machine (2) according to any one of claims 1 to 12, wherein the rotary member (5) is formed integrally with the rotary shaft (4).
    [0014]
    14. A fluid machine (2) according to any one of claims 1 to 13, wherein the stationary and rotary steps have substantially the same shape, and the stationary and rotating recesses have substantially the same shape.
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    同族专利:
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    CN109505665B|2018-12-26|2020-11-10|北京航空航天大学|Sealing device based on aero-engine sealing disc axial force negative feedback control|
    WO2020176339A1|2019-02-25|2020-09-03|Danfoss A/S|Abradable labyrinth seal for refrigerant compressors|
    法律状态:
    2016-05-16| PLFP| Fee payment|Year of fee payment: 2 |
    2016-12-09| PLSC| Publication of the preliminary search report|Effective date: 20161209 |
    2017-05-11| PLFP| Fee payment|Year of fee payment: 3 |
    2017-07-21| TP| Transmission of property|Owner name: DANFOSS SILICON POWER GMBH, DE Effective date: 20170621 |
    2018-05-24| PLFP| Fee payment|Year of fee payment: 4 |
    2019-05-24| PLFP| Fee payment|Year of fee payment: 5 |
    2019-12-27| TP| Transmission of property|Owner name: DANFOSS A/S, DK Effective date: 20191119 |
    2020-05-26| PLFP| Fee payment|Year of fee payment: 6 |
    2021-05-27| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1555135A|FR3037117B1|2015-06-05|2015-06-05|FLUID MACHINE COMPRISING A LABYRINTH SEAL|
    FR1555135|2015-06-05|FR1555135A| FR3037117B1|2015-06-05|2015-06-05|FLUID MACHINE COMPRISING A LABYRINTH SEAL|
    US15/576,433| US10281046B2|2015-06-05|2016-05-19|Fluid machine having a labyrinth seal|
    PCT/EP2016/061183| WO2016192998A1|2015-06-05|2016-05-19|Fluid machine having a labyrinth seal|
    CN201680032489.8A| CN107690542A|2015-06-05|2016-05-19|Fluid machine with labyrinth sealing|
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