(19)
(11)EP 3 118 462 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
04.11.2020 Bulletin 2020/45

(21)Application number: 14885118.1

(22)Date of filing:  05.08.2014
(51)International Patent Classification (IPC): 
F04D 29/46(2006.01)
F04D 27/02(2006.01)
F04D 17/12(2006.01)
(86)International application number:
PCT/CN2014/083752
(87)International publication number:
WO 2015/135282 (17.09.2015 Gazette  2015/37)

(54)

CENTRIFUGAL COMPRESSOR AND CENTRIFUGAL FACILITY HAVING SAME

KREISELVERDICHTER UND KREISELANLAGE DAMIT

COMPRESSEUR CENTRIFUGE ET INSTALLATION CENTRIFUGE LE COMPORTANT


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 12.03.2014 CN 201410091344

(43)Date of publication of application:
18.01.2017 Bulletin 2017/03

(73)Proprietor: Gree Electric Appliances, Inc. of Zhuhai
Zhuhai, Guangdong 519070 (CN)

(72)Inventors:
  • WANG, Hongxing
    Zhuhai Guangdong 519070 (CN)
  • ZHANG, Zhiping
    Zhuhai Guangdong 519070 (CN)
  • ZHONG, Ruixing
    Zhuhai Guangdong 519070 (CN)
  • JIANG, Nan
    Zhuhai Guangdong 519070 (CN)
  • XIE, Rong
    Zhuhai Guangdong 519070 (CN)
  • JIANG, Caiyun
    Zhuhai Guangdong 519070 (CN)
  • LIU, Jianfei
    Zhuhai Guangdong 519070 (CN)
  • CHEN, Yuhui
    Zhuhai Guangdong 519070 (CN)

(74)Representative: Zacco Denmark A/S 
Arne Jacobsens Allé 15
2300 Copenhagen S
2300 Copenhagen S (DK)


(56)References cited: : 
EP-A1- 1 643 133
CN-A- 1 321 225
CN-U- 203 730 350
CN-Y- 201 330 717
GB-A- 305 214
CH-A- 125 547
CN-A- 103 261 701
CN-Y- 2 536 821
CN-Y- 201 330 717
JP-A- 2011 043 130
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Technical field of the invention



    [0001] The invention relates to the field of refrigerating devices, and in particular to a centrifugal compressor and a centrifugal unit having the same.

    Background of the invention



    [0002] For a centrifugal unit, when a running load is reduced, inlet guide blades of a centrifugal compressor are closed gradually, and an air suction quantity is decreased. Suppose a passage area of a diffusion cavity remains unchanged, a flow velocity of air is decreased. When the flow velocity of the air cannot overcome a resistance loss of the diffusion cavity, an airflow will stop. Due to the reduction of kinetic energy of the air, converted pressure energy will be reduced accordingly. When an air pressure is smaller than an exhaust pressure, the airflow flows backwards, and surging is caused. For a single-stage centrifugal compressor, in order to prevent a centrifugal compressor from surging, a diffusion cavity adjustment device and an adjustment mechanism are often linked to act on an outlet of an impeller. When the running load is reduced, the flow velocity of the air can be increased by decreasing the passage area of the diffusion cavity, thereby effectively preventing the centrifugal compressor from surging. For a multi-stage centrifugal compressor, in order to improve the efficiency, an economizer generally exists between every two stages, and therefore an air supply opening exists. If a single movable diffusion cavity adjustment device is used for example, when the centrifugal compressor surges, a surging phenomenon will be improved only at a first stage having an adjustment function since only a single-stage impeller outlet diffusion cavity has the adjustment function while other stages do not have this function, and the surging phenomenon cannot be overcome at each of the other stages yet. If any stage of the multi-stage centrifugal compressor surges, normal working of an entire machine will be influenced, the centrifugal compressor is seriously destroyed, the performance of the centrifugal compressor obviously deteriorates, the noise is increased, vibration of the entire unit is greatly aggravated, and the running reliability of the unit is seriously influenced.

    [0003] D1 (GB305214A) discloses an Improvements in or relating to Means for Controlling the Running of Centrifugal Machines. D1 discloses a guide vanes e, a ring d and an intermediate space c. Guide vanes e are mounted integrally on the ring d, so that the whole forms an unde-formable unit.

    [0004] D2 (CH125547A) discloses a centrifugal compressor, the centrifugal compressor comprises a element (13,6).

    [0005] D3 (JP2011043130A) discloses a centrifugal compressor and refrigeration equipment. The centrifugal compressor of the refrigeration equipment is provided with several stages of impeller 9, a diffuser with vanes 10 and a vaneless diffuser 19 positioned on the outer periphery of each impeller 9, and a return flow path 11 which connects the diffuser with vane 10 and the impeller 9 on the back stage. Several movable downstream guide vanes 13 are positioned in the circumferential direction of the return flow path 11 which leads to the impeller 9 on the last stage, and the diffuser on the last stage is composed of the vaneless diffuser 19 in which a diffuser vane is installed.

    [0006] D4 (CN201330717Y) discloses a movement control component, wherein the movable control part comprises an eccentric cam 7, a guide rod 8 and a reset spring 9.

    Summary of the invention



    [0007] The invention aims to provide a centrifugal compressor and a centrifugal unit having same, which are intended to reduce the possibility of surging of any one of multiple stages of compression units of the centrifugal compressor.

    [0008] In order to achieve the aim, the invention provides a centrifugal compressor, which comprises multiple stages of compression units communicated in sequence. Each stage of compression unit comprises: a diffusion cavity; and a diffusion cavity adjustment device, the diffusion cavity adjustment device comprising a movable member configured to change a flow area of the diffusion cavity provided in correspondence thereto, and the movable member being movably provided in an axial direction of the centrifugal compressor;
    wherein each stage of diffusion cavity adjustment device further includes: a transmission rod, the transmission rod being in drive connection with the corresponding movable member; and a guide structure, fixedly connected with a cavity wall of the corresponding diffusion cavity, the transmission rod being movably provided in the axial direction of the centrifugal compressor with respect to the guide structure;
    the centrifugal compressor further includes: an air inlet; a plurality of inlet guide blades, provided at the air inlet; a drive device, the drive device being in drive connection with the inlet guide blades; and a plurality of transmission shafts, each of the transmission shafts being in drive connection with the drive device respectively, the transmission shafts being in drive connection with the inlet guide blades in a one-to-one correspondence manner, the transmission rod of the compression unit closest to the air inlet being in transmission connection with one of the corresponding transmission shafts, and the transmission rod of each of the remaining stages of compression units being in transmission connection with the movable member of the previous stage of compression unit.

    [0009] Furthermore, each stage of diffusion cavity adjustment device further comprises a reset mechanism configured to move the corresponding movable member to make the flow area of the corresponding diffusion cavity in a maximum state.

    [0010] Furthermore, each diffusion cavity is enclosed by a first cavity wall and a second cavity wall, the first cavity wall and the second cavity wall being provided at an interval, and each guide structure comprises a bushing arranged at the periphery of the corresponding transmission rod in a sleeving manner, the bushing being fixed inside an accommodating hole provided at the corresponding first cavity wall.

    [0011] Furthermore, each reset mechanism comprises: a baffle, connected with an end of the corresponding transmission rod; and a spring, arranged at a periphery of the corresponding bushing in a sleeving manner. Each accommodating hole on the corresponding first cavity wall comprises a first segment adapting to the corresponding bushing and a second segment adapting to the corresponding spring, the spring being located between a step surface, connecting the first segment and the second segment, and the corresponding baffle.

    [0012] Furthermore, each movable member comprises a circular ring, an axis of the centrifugal compressor serving as a centre. A groove adapting to each circular ring is provided at the corresponding first cavity wall; and each accommodating hole has an opening which is provided at a bottom of the corresponding groove and allows the penetration of the corresponding transmission rod.

    [0013] Furthermore, an accommodating slot is provided at an inner circumferential surface of each bushing. Each guide structure further comprises a supporting belt provided in the corresponding accommodating slot, the supporting belt being matched with the corresponding transmission rod slidably.

    [0014] Furthermore, each guide structure comprises at least one guide ring coaxial with the corresponding transmission rod.

    [0015] Furthermore, each reset mechanism comprises: a baffle, connected with an end of the corresponding transmission rod; and a spring, arranged outside the corresponding transmission rod in a sleeving manner and provided between the baffle and the guide ring adjacent to the baffle.

    [0016] Furthermore, each diffusion cavity is enclosed by a first cavity wall and a second cavity wall, the first cavity wall and the second cavity wall being provided at an interval. A accommodating hole is provided at the corresponding first cavity wall, and an outer circumferential surface of at least one guide ring is connected with an inner circumferential surface of the corresponding accommodating hole.

    [0017] Furthermore, each movable member is annular. A groove adapting to each movable member is provided at the corresponding first cavity wall. Each accommodating hole has an opening which is provided at a bottom of the corresponding groove.

    [0018] Furthermore, the centrifugal compressor further comprises at least one drive wheel, the drive wheel sleeves the corresponding transmission shaft and is provided in correspondence to one transmission rod.

    [0019] Furthermore, the drive wheel is a cam or an eccentric bearing. A first end of the corresponding transmission rod of the drive wheel abuts against an outer circumferential surface of the drive wheel. A second end of the corresponding transmission rod of the drive wheel is connected with the corresponding movable member.

    [0020] According to another aspect of the invention, a centrifugal unit is also provided, which comprises an above-mentioned centrifugal compressor.

    [0021] By means of the technical solutions of the invention, the centrifugal compressor comprises multiple stages of compression units which are communicated in sequence, each stage of compression unit comprises the diffusion cavity and the diffusion cavity adjustment device, the diffusion cavity adjustment device comprises the movable member configured to change the radial flow area of the diffusion cavity arranged in correspondence thereto, and the movable member is movably provided in the axial direction of the centrifugal compressor. By means of the technical solutions of the invention, each stage of compression unit comprises the movable member which is movably provided in the axial direction of the centrifugal compressor. The movable member of each stage of compression unit changes the flow area of the diffusion cavity of this stage of compression unit, thereby effectively reducing the possibility of surging.

    Brief description of the drawings



    [0022] The specification drawings forming a part of the invention are intended to provide further understanding of the invention. The schematic embodiments and descriptions of the invention are intended to explain the invention, and do not form improper limits to the invention. In the drawings:

    Fig. 1 shows a structural diagram of a centrifugal compressor according to an embodiment of the invention;

    Fig. 2 shows a structural diagram of amplification of a point A in Fig. 1; and

    Fig. 3 shows a structural diagram of amplification of a point B in Fig. 1



    [0023] Drawing marks: 1, diffusion cavity; 21, movable member; 22, transmission rod; 23, bushing; 24, guide ring; 25, reset mechanism; 26, supporting belt; 251, baffle; 252, spring; 3, inlet guide blade; 4, transmission shaft; and 5, drive wheel.

    Detailed description of the embodiments



    [0024] It is important to note that the embodiments of the invention and the characteristics in the embodiments can be combined under the condition of no conflicts. The invention is described below with reference to the drawings and the embodiments in detail.

    [0025] As shown in Fig. 1, a centrifugal compressor according to an embodiment of the invention comprises multiple stages of compression units which are communicated in sequence. Each stage of compression unit comprises a diffusion cavity 1 and a diffusion cavity adjustment device, wherein the diffusion cavity adjustment device comprises a movable member 21 configured to change a flow area of the diffusion cavity 1 provided in correspondence thereto, the movable member 21 being movably provided in an axial direction of the centrifugal compressor.

    [0026] In the process that each movable member 21 moves in the axial direction of the centrifugal compressor, the flow area of the corresponding diffusion cavity 1 is changed. When a running load is reduced, a flow velocity of air can be increased by decreasing the flow area of each diffusion cavity 1, thereby effectively preventing the compressor from surging.

    [0027] Each stage of diffusion cavity adjustment device further comprises a transmission rod 22 and a guide structure. Each transmission rod 22 is in drive connection with the corresponding movable member 21.

    [0028] In the embodiment, each movable member 21 is fixedly connected with one end of the corresponding transmission rod 22. Each transmission rod 22 drives the corresponding movable member 21 to move in the axial direction of the centrifugal compressor.

    [0029] Each guide structure is fixedly connected with a cavity wall of the corresponding diffusion cavity 1. Each transmission rod 22 is movably provided in the axial direction of the centrifugal compressor with respect to the corresponding guide structure.

    [0030] Each guide structure is configured to guarantee that the corresponding transmission rod 22 moves in the axial direction of the centrifugal compressor with respect to the corresponding diffusion cavity 1. Furthermore, each guide structure reduces a friction force in a movement process of the corresponding transmission rod 22, improves the practicality of the corresponding diffusion cavity adjustment device, and prolongs the service life of this diffusion cavity adjustment device. Furthermore, the precision of this diffusion cavity adjustment device is effectively improved.

    [0031] Each stage of diffusion cavity adjustment device further comprises a reset mechanism 25 configured to move the corresponding movable member 21 to make the flow area of the corresponding diffusion cavity 1 in a maximum state.

    [0032] Each reset mechanism 25 provides a force F1 for the corresponding movable member 21 to move to a position where the flow area of the corresponding diffusion cavity 1 is in the maximum state. When the running load is reduced, each transmission rod 22 exerts a force F2 on the corresponding movable member 21 to make it move to a direction in which the flow area of the corresponding diffusion cavity is reduced. If F2 is greater than F1, each movable member 21 moves to the direction in which the flow area of the corresponding diffusion cavity is reduced.

    [0033] As shown in Fig. 2, in the embodiment, each diffusion cavity 1 is enclosed by a first cavity wall and a second cavity wall, the first cavity wall and the second cavity wall being provided at an interval. Each guide structure comprises a bushing 23 arranged at a periphery of the corresponding transmission rod 22 in a sleeving manner. Each bushing 23 is fixed inside an accommodating hole provided at the corresponding first cavity wall.

    [0034] Each reset mechanism 25 comprises a baffle 251 and a spring 252. Each baffle 251 is connected with the corresponding transmission rod 22 and extends to a direction, away from this transmission rod 22, in a direction of this transmission rod 22. Each baffle 251 is connected to an end of the corresponding transmission rod 22.

    [0035] Each spring 252 is arranged at a periphery of the corresponding bushing 23 in a sleeving manner. The accommodating hole on each first cavity wall comprises a first segment adapting to the corresponding bushing 23 and a second segment adapting to the corresponding spring 252. Each spring 252 is located between a step surface, connecting the corresponding first segment and the corresponding second segment, and the corresponding baffle 251.

    [0036] An accommodating slot is provided at an inner circumferential surface of each bushing 23. Each guide structure further comprises a supporting belt 26 arranged in the corresponding accommodating slot. Each supporting belt 26 is matched with the corresponding transmission rod 22 slidably.

    [0037] Each accommodating slot is an annular slot which is provided at the inner circumferential surface of the corresponding bushing 23 and is coaxial with the corresponding transmission rod 22. Each supporting belt 26 arranged in the corresponding accommodating slot is in an annular shape adapting to this accommodating slot. An inner surface of each supporting belt 26 is higher than that of the corresponding bushing 23. Consequently, in the axial movement process of each transmission rod 22, this transmission rod 22 is only in contact with the inner surface of the corresponding supporting belt. The inner surface of each supporting belt 26 is a smooth surface, thereby effectively reducing a friction force in a movement process of the corresponding transmission rod 22.

    [0038] When the running load is increased, each spring 252 drives the corresponding movable member 21 to move to a direction in which the flow area of the corresponding diffusion cavity is increased, thereby improving the working efficiency of the centrifugal compressor.

    [0039] Each movable member 21 comprises a circular ring, the axis of the centrifugal compressor serving as a centre. A groove adapting to each circular ring is provided at the corresponding first cavity wall. Each accommodating hole has an opening which is provided at a bottom of the corresponding groove and allows the penetration of the corresponding transmission rod 22.

    [0040] When each movable member 21 is completely located in the corresponding groove, the flow area of the corresponding diffusion cavity 1 is in the maximum state. In the process that each transmission rod 22 drives the corresponding movable member 21 to move to the corresponding second cavity wall in the axial direction of the centrifugal compressor, the flow area of the corresponding diffusion cavity 1 is gradually decreased.

    [0041] Also preferably, as shown in Fig. 3, each guide structure comprises at least one guide ring 24 coaxial with the corresponding transmission rod 22. Each reset mechanism 25 comprises the baffle 251 and the spring 252. Each baffle 251 is connected with an end of the corresponding transmission rod 22. Each spring 252 is arranged outside the corresponding transmission rod 22 in a sleeving manner and is provided between the corresponding baffle 251 and a guide ring adjacent to this baffle 251.

    [0042] Each diffusion cavity 1 is enclosed by a first cavity wall and a second cavity wall, the first cavity wall and the second cavity wall being provided at an interval. A accommodating hole is provided at the corresponding first cavity wall, and an outer circumferential surface of at least one guide ring 24 is connected with an inner circumferential surface of the accommodating hole.

    [0043] In the embodiment, each reset mechanism comprises a guide ring 24 which is provided at one end, close to the corresponding second cavity wall, of the corresponding accommodating hole. Each spring 252 is arranged on the corresponding transmission rod 22 in a sleeving manner and is located between the corresponding guide ring 24 and the corresponding baffle 251.

    [0044] Each guide ring 24 reduces the friction force in the movement process of the corresponding transmission rod. A path is provided for the movement of this transmission rod 22. The movement precision of each movable member 21 is guaranteed.

    [0045] Each movable member 21 is annular. Each groove adapting to the corresponding movable member 21 is provided at the corresponding first cavity wall. Each accommodating hole has an opening which is provided at a bottom of the corresponding groove.

    [0046] When each movable member 21 is completely located in the corresponding groove, the flow area of the corresponding diffusion cavity 1 is in the maximum state. In the process that each transmission rod 22 drives the corresponding movable member 21 to move to the corresponding second cavity wall in the axial direction of the centrifugal compressor, the flow area of the corresponding diffusion cavity 1 is gradually decreased.

    [0047] When the running load is increased, each spring 252 drives the corresponding movable member 21 to move to a direction in which the flow area of the corresponding diffusion cavity is increased, thereby improving the working efficiency of the centrifugal compressor.

    [0048] When the running load is reduced, each transmission rod 22 drives the corresponding movable member 21 to move to a direction in which the flow area of the corresponding diffusion cavity is decreased, so that the flow velocity of the air is increased by decreasing the flow area of each diffusion cavity 1, thereby effectively preventing the centrifugal compressor from surging.

    [0049] The centrifugal compressor further comprises a drive device, an air inlet, a plurality of inlet guide blades 3 and a plurality of transmission shafts. The inlet guide blades 3 are provided at the air inlet. The drive device is in drive connection with the inlet guide blades 3.

    [0050] Each of the transmission shafts 4 are in drive connection with the drive device respectively, and the transmission shafts 4 are in drive connection with the inlet guide blades 3 in a one-to-one correspondence manner. The transmission rod 22 of a compression unit closest to the air inlet is in transmission connection with one of the corresponding transmission shafts 4, and the transmission rod 22 of each of the remaining stages of compression units is in transmission connection with the movable member 21 of the previous stage of compression unit.

    [0051] The inlet guide blades 3 rotate with respect to the air inlet in axial directions of the transmission shafts 4 along with the rotation of the transmission shafts. In the rotation process of the inlet guide blades 3, the air inflow of the air inlet of the centrifugal compressor is changed, thereby changing the running load of the centrifugal compressor.

    [0052] The centrifugal compressor further comprises at least one drive wheel 5. The drive wheel 5 sleeves the corresponding transmission shaft 4 and is arranged in correspondence to one certain transmission rod 22.

    [0053] The drive wheel 5 is a cam or an eccentric bearing. A first end of the corresponding transmission rod 22 of the drive wheel 5 abuts against an outer circumferential surface of the drive wheel 5. A second end of the corresponding transmission rod 22 of the drive wheel 5 is connected with the corresponding movable member 21.

    [0054] In the process that each inlet guide blade 3 rotates to a direction in which the air inflow of the centrifugal compressor is decreased, the corresponding drive wheel rotates, a distance from an abutting point between this drive wheel and the corresponding transmission rod 22 to an axis of the corresponding transmission shaft 4 is gradually increased, and this drive wheel drives the corresponding movable member 21 to move to a direction in which the flow area of the corresponding diffusion cavity 1 is decreased via this transmission rod 22.

    [0055] In the process that each inlet guide blade 3 rotates to a direction in which the air inflow of the centrifugal compressor is increased, the corresponding drive wheel rotates, a distance from an abutting point between this drive wheel and the corresponding transmission rod 22 to an axis of the corresponding transmission shaft 4 is gradually decreased, and this transmission rod 22 drives the corresponding movable member 21 to move to a direction in which the flow area of the corresponding diffusion cavity 1 is increased under the driving of the corresponding spring 252.

    [0056] According to another aspect of the invention, a centrifugal unit is also provided, which comprises an above-mentioned centrifugal compressor.

    [0057] The above describes preferred embodiments of the invention, and is not intended to limit the invention. There can be various modifications and variations in the invention, defined by the claims


    Claims

    1. A centrifugal compressor, comprising multiple stages of compression units which are communicated in sequence, each stage of compression unit comprising:

    a diffusion cavity (1); and

    a diffusion cavity adjustment device, the diffusion cavity adjustment device comprising a movable member (21) configured to change a flow area of the diffusion cavity (1) provided in correspondence thereto, and the movable member (21) being movably provided in an axial direction of the centrifugal compressor;

    wherein each stage of diffusion cavity adjustment device further comprises:

    a transmission rod (22), the transmission rod (22) being in drive connection with the corresponding movable member (21); and

    a guide structure, fixedly connected with a cavity wall of the corresponding diffusion cavity (1), the transmission rod (22) being movably provided in the axial direction of the centrifugal compressor with respect to the guide structure;

    the centrifugal compressor further comprises:

    an air inlet; being characterised in that the centrifugal compressor further comprises

    a plurality of inlet guide blades (3), provided at the air inlet;

    a drive device, the drive device being in drive connection with the inlet guide blades (3); and a plurality of transmission shafts (4), each of the transmission shafts (4) being in drive connection with the drive device respectively, the transmission shafts (4) being in drive connection with the inlet guide blades (3) in a one-to-one correspondence manner, the transmission rod (22) of the compression unit closest to the air inlet being in transmission connection with one of the corresponding transmission shafts (4), and the transmission rod (22) of each of the remaining stages of compression units being in transmission connection with the movable member (21) of the previous stage of compression unit.


     
    2. The centrifugal compressor according to claim 1, wherein each stage of diffusion cavity adjustment device further comprises a reset mechanism (25) configured to move the corresponding movable member (21) to make the flow area of the corresponding diffusion cavity (1) in a maximum state.
     
    3. The centrifugal compressor according to claim 2, wherein each diffusion cavity (1) is enclosed by a first cavity wall and a second cavity wall, the first cavity wall and the second cavity wall being provided at an interval; and each guide structure comprises a bushing (23) arranged at the periphery of the corresponding transmission rod (22) in a sleeving manner, the bushing (23) being fixed inside an accommodating hole provided at the corresponding first cavity wall.
     
    4. The centrifugal compressor according to claim 3, wherein each reset mechanism (25) comprises:

    a baffle (251), connected with an end of the corresponding transmission rod (22); and

    a spring (252), arranged at a periphery of the corresponding bushing (23) in a sleeving manner, each accommodating hole on the corresponding first cavity wall comprises a first segment adapting to the corresponding bushing (23) and a second segment adapting to the corresponding spring (252), and the spring (252) being located between a step surface, connecting the first segment and the second segment, and the baffle (251).


     
    5. The centrifugal compressor according to claim 4, wherein each movable member (21) comprises a circular ring, an axis of the centrifugal compressor serving as a centre; a groove adapting to each circular ring is provided at the corresponding first cavity wall; and each accommodating hole has an opening which is provided at a bottom of the corresponding groove and allows the penetration of the corresponding transmission rod (22).
     
    6. The centrifugal compressor according to claim 3, wherein an accommodating slot is provided at an inner circumferential surface of each bushing (23); and each guide structure further comprises a supporting belt (26) provided in the corresponding accommodating slot, the supporting belt (26) being matched with the corresponding transmission rod (22) slidably.
     
    7. The centrifugal compressor according to claim 2, wherein each guide structure comprises at least one guide ring (24) coaxial with the corresponding transmission rod (22).
     
    8. The centrifugal compressor according to claim 7, wherein each reset mechanism (25) comprises:

    a baffle (251), connected with an end of the corresponding transmission rod (22); and

    a spring (252), arranged outside the corresponding transmission rod (22) in a sleeving manner and provided between the baffle (251) and the guide ring (24) adjacent to the baffle (251).


     
    9. The centrifugal compressor according to claim 8, wherein each diffusion cavity (1) is enclosed by a first cavity wall and a second cavity wall, the first cavity wall and the second cavity wall being provided at an interval; a accommodating hole is provided at the corresponding first cavity wall; and an outer circumferential surface of at least one guide ring (24) is connected with an inner circumferential surface of the corresponding accommodating hole.
     
    10. The centrifugal compressor according to claim 9, wherein each movable member (21) is annular; a groove adapting to each movable member (21) is provided at the corresponding first cavity wall; and each accommodating hole has an opening which is provided at a bottom of the corresponding groove.
     
    11. The centrifugal compressor according to claim 1, further comprising at least one drive wheel (5), wherein the drive wheel (5) sleeves the corresponding transmission shaft (4) and is provided in correspondence to one transmission rod (22).
     
    12. The centrifugal compressor according to claim 11, wherein the drive wheel (5) is a cam or an eccentric bearing; a first end of the corresponding transmission rod (22) of the drive wheel (5) abuts against an outer circumferential surface of the drive wheel (5); and a second end of the corresponding transmission rod (22) of the drive wheel (5) is connected with the corresponding movable member (21).
     
    13. A centrifugal unit, comprising a centrifugal compressor according to any one of claims 1 to 12.
     


    Ansprüche

    1. Zentrifugalverdichter, umfassend mehrere Stufen von Verdichtungseinheiten, die in Reihe kommuniziert werden, wobei jede Stufe der Verdichtungseinheit umfasst:

    einen Diffusionshohlraum (1); und

    eine Diffusionshohlraumeinstellvorrichtung, wobei die Diffusionshohlraumeinstellvorrichtung ein bewegliches Element (21) umfasst, das dazu ausgelegt ist,

    einen Strömungsbereich des entsprechend vorgesehenen Diffusionshohlraums (1) zu ändern, und wobei das bewegliche Element (21) beweglich in einer axialen Richtung des Zentrifugalverdichters vorgesehen ist; wobei jede Stufe der Diffusionshohlraumeinstellvorrichtung ferner umfasst:

    eine Übertragungsstange (22), wobei die Übertragungsstange (22) mit dem entsprechenden beweglichen Element (21) in Antriebsverbindung steht; und

    eine Führungsstruktur, die fest mit einer Hohlraumwand des entsprechenden Diffusionshohlraums (1) verbunden ist, wobei die Übertragungsstange (22) beweglich in der axialen Richtung des Zentrifugalverdichters in Bezug auf die Führungsstruktur vorgesehen ist; der Zentrifugalverdichter ferner umfasst:

    einen Lufteinlass; dadurch gekennzeichnet, dass der Zentrifugalverdichter ferner umfasst

    eine Vielzahl von an dem Lufteinlass vorgesehenen Einlassleitschaufeln (3); eine Antriebsvorrichtung, wobei die Antriebsvorrichtung mit den Einlassleitschaufeln (3) in Antriebsverbindung steht; und eine Vielzahl von Übertragungswellen (4), wobei jede der Übertragungswellen (4) jeweils mit der Antriebsvorrichtung in Antriebsverbindung steht, wobei die Übertragungswellen (4) mit den Einlassleitschaufeln (3) in einer Eins-zu-Eins-Korrespondenz in Antriebsverbindung stehen, wobei die dem Lufteinlass am nächsten liegende Übertragungsstange (22) der Verdichtungseinheit mit einer der entsprechenden Übertragungswellen (4) in Übertragungsverbindung steht, und die Übertragungsstange (22) jeder der übrigen Stufen von Verdichtungseinheiten mit dem beweglichen Element (21) der vorhergehenden Stufe der Verdichtungseinheit in Übertragungsverbindung steht.


     
    2. Zentrifugalverdichter nach Anspruch 1, wobei jede Stufe der Diffusionshohlraumeinstellvorrichtung ferner einen Rückstellmechanismus (25) umfasst, der ausgelegt ist, um das entsprechende bewegliche Element (21) zu bewegen, um den Strömungsbereich des entsprechenden Diffusionshohlraums (1) in einen maximalen Zustand zu bringen.
     
    3. Zentrifugalverdichter nach Anspruch 2, wobei jeder Diffusionshohlraum (1) von einer ersten Hohlraumwand und einer zweiten Hohlraumwand umschlossen ist, wobei die erste Hohlraumwand und die zweite Hohlraumwand in einem Intervall vorgesehen sind; und jede Führungsstruktur eine Buchse (23) umfasst, die am Umfang der entsprechenden Übertragungsstange (22) hülsenartig angeordnet ist, wobei die Buchse (23) innerhalb eines an der entsprechenden ersten Hohlraumwand vorgesehenen Aufnahmelochs befestigt ist.
     
    4. Zentrifugalverdichter nach Anspruch 3, wobei jeder Rückstellmechanismus (25) umfasst:

    ein mit einem Ende der entsprechenden Übertragungsstange (22) verbundenes Leitblech (251); und

    eine Feder (252), die an einem Umfang der entsprechenden Buchse (23) hülsenartig angeordnet ist, wobei jedes Aufnahmeloch an der entsprechenden ersten Hohlraumwand ein an die entsprechende Buchse (23) angepasstes erstes Segment und ein an die entsprechende Feder (252) angepasstes zweites Segment umfasst, und die Feder (252) zwischen einer das erste Segment und das zweite Segment verbindenden Trittfläche und dem Leitblech (251) angeordnet ist.


     
    5. Zentrifugalverdichter nach Anspruch 4, wobei jedes bewegliche Element (21) einen kreisförmigen Ring umfasst, wobei eine Achse des Zentrifugalverdichters als Zentrum dient; eine Nut, die jedem kreisförmigen Ring angepasst ist, an der entsprechenden ersten Hohlraumwand vorgesehen ist; und jedes Aufnahmeloch eine Öffnung aufweist, die an einem Boden der entsprechenden Nut vorgesehen ist und das Eindringen der entsprechenden Übertragungsstange (22) ermöglicht.
     
    6. Zentrifugalverdichter nach Anspruch 3, wobei ein Aufnahmeschlitz an einer Innenumfangsfläche jeder Buchse (23) vorgesehen ist; und jede Führungsstruktur ferner ein Stützband (26) umfasst, das in dem entsprechenden Aufnahmeschlitz vorgesehen ist, wobei das Stützband (26) mit der entsprechenden Übertragungsstange (22) verschiebbar abgestimmt ist.
     
    7. Zentrifugalverdichter nach Anspruch 2, wobei jede Führungsstruktur zumindest einen mit der entsprechenden Übertragungsstange (22) koaxialen Führungsring (24) umfasst.
     
    8. Zentrifugalverdichter nach Anspruch 7, wobei jeder Rückstellmechanismus (25) umfasst:

    ein mit einem Ende der entsprechenden Übertragungsstange (22) verbundenes Leitblech (251); und

    eine außerhalb der entsprechenden Übertragungsstange (22) hülsenartig angeordnete und zwischen dem Leitblech (251) und dem Führungsring (24) benachbart zum Leitblech (251) vorgesehene Feder (252).


     
    9. Zentrifugalverdichter nach Anspruch 8, wobei jeder Diffusionshohlraum (1) von einer ersten Hohlraumwand und einer zweiten Hohlraumwand umschlossen ist, wobei die erste Hohlraumwand und die zweite Hohlraumwand in einem Intervall vorgesehen sind; ein Aufnahmeloch an der entsprechenden ersten Hohlraumwand vorgesehen ist; und eine Außenumfangsfläche mindestens eines Führungsrings (24) mit einer Innenumfangsfläche des entsprechenden Aufnahmelochs verbunden ist.
     
    10. Zentrifugalverdichter nach Anspruch 9, wobei jedes bewegliche Element (21) ringförmig ist; eine an jedes bewegliche Element (21) angepasste Nut an der entsprechenden ersten Hohlraumwand vorgesehen ist; und jedes Aufnahmeloch eine an einem Boden der entsprechenden Nut vorgesehene Öffnung aufweist.
     
    11. Zentrifugalverdichter nach Anspruch 1, ferner umfassend mindestens ein Antriebsrad (5), wobei das Antriebsrad (5) die entsprechende Übertragungswelle (4) umhüllt und entsprechend einer Übertragungsstange (22) vorgesehen ist.
     
    12. Zentrifugalverdichter nach Anspruch 11, wobei das Antriebsrad (5) ein Nocken oder ein Exzenterlager ist; ein erstes Ende der entsprechenden Übertragungsstange (22) des Antriebsrades (5) an einer Außenumfangsfläche des Antriebsrades (5) anliegt; und ein zweites Ende der entsprechenden Übertragungsstange (22) des Antriebsrades (5) mit dem entsprechenden beweglichen Element (21) verbunden ist.
     
    13. Zentrifugaleinheit, umfassend einen Zentrifugalverdichter nach einem der Ansprüche 1 bis 12.
     


    Revendications

    1. Compresseur centrifuge, comprenant de multiples étages d'unités de compression qui sont communiquées en séquence, chaque étage d'unité de compression comprenant :

    une cavité de diffusion (1) ; et

    un dispositif d'ajustement de cavité de diffusion, le dispositif d'ajustement de cavité de diffusion comprenant un élément mobile (21) configuré pour modifier une zone d'écoulement de la cavité de diffusion (1) prévue en correspondance avec celle-ci, et l'élément mobile (21) étant prévu de manière mobile dans une direction axiale du compresseur centrifuge ; chaque étage du dispositif de réglage de la cavité de diffusion comprenant en outre :

    une tige de transmission (22), la tige de transmission (22) étant en liaison d'entraînement avec l'élément mobile correspondant (21) ; et

    une structure de guidage reliée fixement à une paroi de cavité de la cavité de diffusion correspondante (1), la tige de transmission (22) étant prévue de manière mobile dans la direction axiale du compresseur centrifuge par rapport à la structure de guidage ; le compresseur centrifuge comprenant en outre :
    une entrée d'air ; caractérisé en ce que le compresseur centrifuge comprend en outre :

    une pluralité de lames de guidage d'entrée (3), prévues à l'entrée d'air ;

    un dispositif d'entraînement, le dispositif d'entraînement étant en liaison d'entraînement avec les lames de guidage d'entrée (3) ; et une pluralité d'arbres de transmission (4), chacun des arbres de transmission (4) étant en liaison d'entraînement avec le dispositif d'entraînement, respectivement, les arbres de transmission (4) étant en liaison d'entraînement avec les lames de guidage d'entrée (3) d'une manière de correspondance biunivoque, la tige de transmission (22) de l'unité de compression la plus proche de l'entrée d'air étant en liaison de transmission avec l'un des arbres de transmission correspondants (4), et la tige de transmission (22) de chacun des étages de compression restants des unités étant en liaison de transmission avec l'élément mobile (21) de l'étage précédent de l'unité de compression.


     
    2. Compresseur centrifuge selon la revendication 1, dans lequel chaque étage du dispositif d'ajustement de cavité de diffusion comprend en outre un mécanisme de réinitialisation (25) configuré pour déplacer l'élément mobile correspondant (21) pour amener la zone d'écoulement de la cavité de diffusion correspondante (1) dans un état maximal.
     
    3. Compresseur centrifuge selon la revendication 2, dans lequel chaque cavité de diffusion (1) est enfermée par une première paroi de cavité et une deuxième paroi de cavité, la première paroi de cavité et la deuxième paroi de cavité étant prévues à un intervalle ; et chaque structure de guidage comprend une douille (23) agencée à la périphérie de la tige de transmission correspondante (22) de manière gainée, la douille (23) étant fixée à l'intérieur d'un trou de réception prévu au niveau de la première paroi de cavité correspondante.
     
    4. Compresseur centrifuge selon la revendication 3, dans lequel chaque mécanisme de réinitialisation (25) comprend :

    un déflecteur (251) relié à une extrémité de la tige de transmission correspondante (22) ; et

    un ressort (252) disposé à une périphérie de la douille correspondante (23) de manière gainée, chaque trou de réception sur la première paroi de cavité correspondante comprenant un premier segment s'adaptant à la douille correspondante (23) et un deuxième segment s'adaptant au ressort correspondant (252), et le ressort (252) étant situé entre une surface de marche, reliant le premier segment et le deuxième segment, et le déflecteur (251).


     
    5. Compresseur centrifuge selon la revendication 4, dans lequel chaque élément mobile (21) comprend une bague circulaire, un axe du compresseur centrifuge servant de centre ; une rainure s'adaptant à chaque bague circulaire est prévue au niveau de la première paroi de cavité correspondante ; et chaque trou de réception a une ouverture qui est prévue au fond de la rainure correspondante et permet la pénétration de la tige de transmission correspondante (22).
     
    6. Compresseur centrifuge selon la revendication 3, dans lequel une fente de réception est prévue au niveau d'une surface circonférentielle intérieure de chaque douille (23) ; et chaque structure de guidage comprend en outre une ceinture de support (26) prévue dans la fente de réception correspondante, la ceinture de support (26) étant adaptée de manière coulissante avec la tige de transmission correspondante (22).
     
    7. Compresseur centrifuge selon la revendication 2, dans lequel chaque structure de guidage comprend au moins une bague de guidage (24) coaxiale avec la tige de transmission correspondante (22).
     
    8. Compresseur centrifuge selon la revendication 7, dans lequel chaque mécanisme de réinitialisation (25) comprend :

    un déflecteur (251) relié à une extrémité de la tige de transmission correspondante (22) ; et

    un ressort (252) disposé à l'extérieur de la tige de transmission correspondante (22) de manière gainée et disposé entre le déflecteur (251) et la bague de guidage (24) adjacente au déflecteur (251).


     
    9. Compresseur centrifuge selon la revendication 8, dans lequel chaque cavité de diffusion (1) est enfermée par une première paroi de cavité et une deuxième paroi de cavité, la première paroi de cavité et la deuxième paroi de cavité étant prévues à un intervalle ; un trou de réception est prévu au niveau de la première paroi de cavité correspondante ; et une surface circonférentielle extérieure d'au moins une bague de guidage (24) est reliée à une surface circonférentielle intérieure du trou de réception correspondant.
     
    10. Compresseur centrifuge selon la revendication 9, dans lequel chaque élément mobile (21) est annulaire ; une rainure s'adaptant à chaque élément mobile (21) est prévue au niveau de la première paroi de cavité correspondante ; et chaque trou de réception a une ouverture qui est prévue au fond de la rainure correspondante.
     
    11. Compresseur centrifuge selon la revendication 1, comprenant en outre au moins une roue motrice (5), dans lequel chaque roue motrice (5) enveloppe l'arbre de transmission correspondant (4) et est prévue en correspondance avec une tige de transmission (22).
     
    12. Compresseur centrifuge selon la revendication 11, dans lequel la roue motrice (5) est une came ou un palier excentrique ; une première extrémité de la tige de transmission correspondante (22) de la roue motrice (5) vient en butée contre une surface circonférentielle extérieure de la roue motrice (5) ; et une deuxième extrémité de la tige de transmission correspondante (22) de la roue d'entraînement (5) est reliée à l'élément mobile correspondant (21).
     
    13. Unité centrifuge, comprenant un compresseur centrifuge selon l'une quelconque des revendications 1 à 12.
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description