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WO2020134432A1 - Ensemble rotor de compresseur, compresseur et système de circulation de réfrigérant - Google Patents

Ensemble rotor de compresseur, compresseur et système de circulation de réfrigérant Download PDF

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Publication number
WO2020134432A1
WO2020134432A1 PCT/CN2019/112986 CN2019112986W WO2020134432A1 WO 2020134432 A1 WO2020134432 A1 WO 2020134432A1 CN 2019112986 W CN2019112986 W CN 2019112986W WO 2020134432 A1 WO2020134432 A1 WO 2020134432A1
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WO
WIPO (PCT)
Prior art keywords
hole
impeller
rotor assembly
compressor
compressor rotor
Prior art date
Application number
PCT/CN2019/112986
Other languages
English (en)
Chinese (zh)
Inventor
刘华
张治平
李宏波
陈玉辉
钟瑞兴
叶文腾
亓静利
Original Assignee
珠海格力电器股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 珠海格力电器股份有限公司 filed Critical 珠海格力电器股份有限公司
Publication of WO2020134432A1 publication Critical patent/WO2020134432A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps

Definitions

  • the present disclosure relates to the technical field of compressors, and in particular, to a compressor rotor assembly, a compressor, and a refrigerant circulation system.
  • Centrifugal compressors increase the energy of the gas through the impeller's work on the gas.
  • the increased energy of the gas is directly related to the speed of the impeller.
  • the speed of the impeller can reach several thousand revolutions per minute. For example, the speed of some impellers may reach more than 30,000 rpm.
  • the quality of the impeller locking structure is important to ensure the reliability and safety of the impeller during operation. effect.
  • centrifugal compressor impeller locking mainly has two methods of hot sleeve cooperative locking and key cooperative locking.
  • the impeller When using a hot sleeve to lock, the impeller is first heated to about 100 °C, so that it is quickly expanded after being heated and assembled with the main shaft, and then the assembly interference caused by the cooling of the impeller is used to achieve the purpose of locking.
  • the structure of the heat sleeve and the locking method is relatively simple, no additional parts are required, but heating equipment is required, and it is not conducive to disassembly and has strict requirements on the assembly process.
  • the keying and locking method relies on the keyway and key to restrict the impeller displacement and torque transmission, but the key is a standard part, and its inherent right-angle structure will concentrate the stress on the end of the keyway and reduce the strength of the impeller.
  • the embodiments of the present disclosure provide a compressor rotor assembly, a compressor, and a refrigerant circulation system, which are convenient for installation and disassembly.
  • a compressor rotor assembly including:
  • the impeller which is provided with a first connection hole
  • a rotor shaft provided with a second connection hole
  • the connecting rod has one end inserted into the first connecting hole and detachably connected with the impeller; the other end inserted into the second connecting hole and detachably connected with the rotor shaft.
  • the circumferential side of the connecting rod is provided with a boss extending in the radial direction, and the boss cooperates with the first connecting hole or the second connecting hole to support the connecting rod.
  • the boss is disposed in the second connection hole.
  • the second connection hole is a blind hole.
  • the end of the second connecting hole away from the impeller is provided with internal threads
  • the end of the connecting rod away from the impeller is provided with external threads
  • the connecting rod and the rotor shaft are connected by threads.
  • the second connection hole includes:
  • the first hole section is set close to the impeller
  • the second hole section is provided on the side of the first hole section away from the impeller and has a diameter smaller than that of the first hole section;
  • the third hole section is arranged on the side of the second hole section away from the impeller, and its diameter is smaller than that of the second hole section, and its inner wall is provided with internal threads.
  • the end of the first hole segment remote from the impeller is provided with a chamfer.
  • the connecting rod includes:
  • the first rod section is disposed in the first hole section, and the end face away from the impeller is in tight contact with the end face of the first hole section;
  • the second rod segment the diameter of which is smaller than the diameter of the first rod segment, is disposed in the second hole segment, and its axial length is less than or equal to the length of the second hole segment;
  • the third rod section whose diameter is smaller than the diameter of the second rod section, is arranged in the third hole section, and its outer periphery is provided with an external thread, which is locked in cooperation with the internal thread in the third hole section.
  • the connecting rod includes a force applying section for cooperating with the screwing tool.
  • the first connection hole is a through hole.
  • it further includes a connecting member for connecting the connecting rod and the impeller.
  • the connecting member is a lock nut.
  • the lock nut is provided with a connection hole
  • the connection hole includes a first connection hole segment and a second connection hole segment
  • the diameter of the first connection hole segment is greater than the diameter of the second connection hole segment
  • the first connection hole The segment is closer to the impeller than the second connecting hole segment.
  • the end of the impeller near the rotor shaft is provided with an insertion portion, and the insertion portion is inserted into the second connection hole.
  • the end of the impeller close to the rotor shaft is provided with a first mating end surface
  • the end of the rotor shaft close to the impeller is provided with a second mating end surface
  • the first mating end surface is in tight contact with the second mating end surface
  • a compressor including the compressor rotor assembly described above.
  • the compressor includes a gas bearing on which the compressor rotor assembly is supported.
  • a refrigerant circulation system including the above-mentioned compressor.
  • the embodiment of the compressor rotor assembly of the present disclosure includes a connecting rod, one end of the connecting rod is inserted into the first connecting hole and detachably connected to the impeller, and the other end of the connecting rod is inserted into the second connecting hole and connected to the rotor shaft
  • the detachable connection makes the installation and disassembly of the impeller and the rotor shaft more convenient, solves the problem of difficult disassembly in the related art using the heat sleeve matching method, and does not require heating equipment, simplifying the impeller assembly process and equipment, Effectively improve the assembly efficiency and improve the operability of later maintenance.
  • FIG. 1 is a schematic structural diagram of an embodiment of a compressor rotor assembly of the present disclosure.
  • FIG. 2 is a schematic structural view of a connecting rod in an embodiment of a compressor rotor assembly of the present disclosure.
  • FIG 3 is a schematic structural view of a lock nut in an embodiment of a compressor rotor assembly of the present disclosure.
  • FIG. 4 is a schematic structural diagram of another embodiment of a compressor rotor assembly of the present disclosure.
  • the compressor rotor assembly includes an impeller 1, a rotor shaft 2 and a connecting rod 3, and the impeller 1 is provided with a first connecting hole 11 and a rotor shaft 2 is provided with a second connecting hole 21, one end of the connecting rod 3 is inserted into the first connecting hole 11, and the connecting rod 3 is detachably connected to the impeller 1; the other end of the connecting rod 3 is inserted into the second connecting hole 21, and the connecting rod 3
  • the rotor shaft 2 is detachably connected.
  • the compressor rotor assembly includes a connecting rod 3, one end of the connecting rod 3 is inserted into the first connecting hole 11 and is detachably connected to the impeller 1, and the other end of the connecting rod 3 is inserted into the second connecting hole 21, and
  • the rotor shaft 2 is detachably connected, which makes the installation and removal of the impeller 1 and the rotor shaft 2 more convenient. It solves the problem of difficult disassembly in the related art using the heat sleeve matching method, and does not require heating equipment, simplifying the impeller.
  • the assembly process and equipment effectively improve assembly efficiency and improve the operability of later maintenance.
  • the circumferential side of the connecting rod 3 is provided with a boss 31 extending in the radial direction.
  • the boss 31 cooperates with the first connecting hole 11 or the second connecting hole 21 to support the connecting rod 3.
  • the boss 31 can support the connecting rod 3, effectively prevent the cantilever of the connecting rod from being too long and cause excessive deflection, prevent the connecting rod 3 from deforming when the rotor shaft rotates at high speed, effectively increase the strength of the connecting rod, and improve the connection rod Service life.
  • the boss 31 also helps to ensure the concentricity of the connecting rod 3 with the impeller 1 and the rotor shaft 2.
  • the number of the bosses 31 can be flexibly set according to needs.
  • the number of the bosses 31 is one, and the bosses 31 are arranged in the middle of the connecting rod 3; the number of the bosses 31 can also be multiple, and the multiple bosses 31 can be Arranged at intervals along the circumferential direction of the connecting rod 3, it may also be arranged at intervals along the axial direction of the connecting rod 3 to achieve better support.
  • the axial length of the rotor shaft 2 is longer than the axial length of the impeller 1, so the length of the second connecting hole 21 is set to be longer than the length of the first connecting hole 11, and the boss 31 can be set at
  • the second connecting hole 21 is in clearance fit with the inner wall surface of the second connecting hole 21 to support the connecting rod 3, which is beneficial to achieve a relatively balanced supporting effect.
  • the axial length of the boss 31 is optionally greater than 10 mm.
  • the second connection hole 21 is a blind hole.
  • the advantage of setting the second connecting hole 21 as a blind hole is that it can facilitate the connection of the connecting rod 3 and the rotor shaft 2; second, it can ensure that the rotor shaft 2 has sufficient strength.
  • connection the connecting rod 3 to the rotor shaft 2 There are various options for connecting the connecting rod 3 to the rotor shaft 2.
  • the end of the second connecting hole 21 away from the impeller 1 is provided with internal threads
  • the end of the connecting rod 3 away from the impeller 1 is provided with external threads
  • the connecting rod 3 and the rotor shaft 2 are connected by threads.
  • the screw connection method is not only convenient for installation and disassembly, but also can relieve the stress concentration problem compared with the key connection method, and effectively improve the strength of the connecting rod 3.
  • after the connecting rod 3 and the rotor shaft 2 are screwed together they can also be fixed by adhesive.
  • the second connecting hole 21 includes a first hole segment, a second hole segment, and a third hole segment, wherein the first hole segment is disposed near the impeller 1 and the second hole segment is disposed on the first hole segment away from the impeller 1 And the diameter of the second hole segment is smaller than the diameter of the first hole segment, the third hole segment is disposed on the side of the second hole segment away from the impeller 1, and the diameter of the third hole segment is smaller than that of the second hole segment Diameter, its inner wall is provided with internal thread.
  • the end of the first hole section away from the impeller 1 is provided with a chamfer.
  • the setting of the chamfer can facilitate the opening of the first hole section and reduce the processing difficulty.
  • the connecting rod 3 includes a first rod segment 32, a second rod segment 33 and a third rod segment 34, the first rod segment 32 is disposed in the first hole segment, and the first rod segment 32
  • the end face away from the impeller 1 is in tight contact with the end face of the first hole section to axially position the connecting rod 3.
  • the machining accuracy of the end face of the first rod section 32 away from the impeller 1 and the end face of the first hole section is relatively high.
  • the roughness Ra of the two end faces should satisfy: Ra ⁇ 3.2um, and relative to the centerline of the rotor shaft 2
  • the coaxiality should be ⁇ 0.05mm to achieve precise positioning.
  • the diameter of the second rod segment 33 is smaller than the diameter of the first rod segment 32, the second rod segment 33 is disposed in the second hole segment, and the length of the second rod segment 33 in the axial direction is less than or equal to the length of the second hole segment,
  • the second rod section 33 is used to radially position the connecting rod 3. There is a clearance fit between the second rod section 33 and the second hole section, and the clearance is controlled at 0.01 mm to 0.03 mm. In order to achieve a better radial positioning effect, the length of the second rod section 33 is optionally greater than or equal to 10 mm.
  • the diameter of the third rod segment 34 is smaller than the diameter of the second rod segment 33.
  • the third rod segment 34 is disposed in the third hole segment, and the outer periphery of the third rod segment 34 is provided with an external thread The thread fits tightly.
  • the first connection hole 11 is a through hole.
  • the advantage of this arrangement is that the connection between the connecting rod 3 and the impeller 1 can be easily achieved, and the connection position can be transferred from the smaller space between the impeller 1 and the rotor shaft 2 to the side of the impeller 1 away from the rotor shaft 2 and the operable space Larger for easier connection.
  • the side of the first rod section 32 of the connecting rod 3 away from the second rod section 33 is provided with a force applying section 35, and the side of the force section 35 away from the first rod section 32 is provided with a fourth ⁇ 36 ⁇ 36 segments.
  • the cross section of the force-applying section 35 has a hexagonal shape, so as to facilitate cooperation with the screwing tool.
  • the diameter of the force applying section 35 is smaller than the diameter of the first rod section 32, and the diameter of the fourth rod section 36 is smaller than the diameter of the force applying section 35.
  • the first connecting hole 11 is also a stepped hole, and the diameter of the hole section near the rotor shaft 2 is larger than the diameter of the hole section away from the rotor shaft 2.
  • the portion of the first rod section 32 and the urging section 35 of the connecting rod 3 are located in the larger-diameter hole section of the first connecting hole 11.
  • the fourth rod section 36 cooperates with the smaller-diameter hole section of the first connection hole 11.
  • the compressor rotor assembly further includes a connecting member, which is used to connect the connecting rod 3 and the impeller 1.
  • the connecting piece is a lock nut 4.
  • the lock nut 4 is provided with a connecting hole, the connecting hole includes a first connecting hole segment 41 and a second connecting hole segment 42, the diameter of the first connecting hole segment 41 is greater than the diameter of the second connecting hole segment 42, And the first connecting hole section 41 is closer to the impeller 1 than the second connecting hole section 42.
  • This structural arrangement of the lock nut 4 can be smoother when the lock nut 4 penetrates the connecting rod 3, and the first connecting hole section 41 with a larger diameter has a guiding effect; moreover, the connecting rod 3 and the second connecting hole section 42 is threaded, and the first connecting hole section 41 is set as a light section, which can make the end face of the lock nut 4 first contact with the end face of the impeller 1 to tighten, effectively avoiding interference with the root of the external thread end on the connecting rod 3 or failure Tighten the impeller 1 to ensure the reliability of the connection.
  • the outer circumference of the fourth rod section 36 is provided with external threads, and the inner wall of the second connecting hole section 42 of the lock nut 4 is provided with internal threads.
  • the fourth rod section 36 and the lock nut 4 are locked by threaded cooperation, and the lock nut 4 It is pressed on the end surface of the impeller 1 to achieve the locking of the connecting rod 3 and the impeller 1.
  • the specifications of the external thread on the fourth rod segment 36 and the external thread on the third rod segment 34 may be the same or different.
  • the rotation direction of the external thread on the fourth rod segment 36 and the external thread on the third rod segment 34 is the same as the rotation direction of the rotor shaft 2, which effectively prevents the threads from loosening during the rotation.
  • an end of the impeller 1 near the rotor shaft 2 is provided with an insertion portion 12, and the insertion portion 12 is inserted into the second connection hole 21.
  • the impeller 1 and the rotor shaft 2 can be pre-positioned, which facilitates further connection.
  • the machining accuracy of the outer peripheral surface of the insertion portion 12 is higher than the machining accuracy of the non-insertion portion.
  • the portion of the inner wall surface of the second connection hole 21 that matches the insertion portion 12 is higher than the machining accuracy of other portions of the inner wall surface, which facilitates accurate positioning .
  • the end of the impeller 1 close to the rotor shaft 2 is provided with a first mating end surface
  • the end of the rotor shaft 2 close to the impeller 1 is provided with a second mating end surface
  • the first mating end surface is in tight contact with the second mating end surface
  • the first mating end surface may be a boss projecting toward the rotor shaft 2 with respect to the end surface of the impeller 1 close to the rotor shaft 2, and the radial dimension of the boss is smaller than the radial dimension of the end surface of the impeller 1.
  • the second mating end surface may be a section of a boss projecting with respect to the end surface of the rotor shaft 2 close to the impeller 1 in a direction close to the impeller 1, and the radial dimension of the boss is smaller than the radial dimension of the end surface of the rotor shaft 2 .
  • the compressor rotor assembly includes two sections of rotor shaft 2 with magnetic steel disposed between the two rotor shafts 2.
  • the right section of the rotor shaft 2 on the left side is provided with an accommodating groove, and the magnetic steel is disposed in the accommodating groove, and the rotor shaft 2 on the right is also at least partially located in the accommodating groove to pass through the groove wall of the accommodating groove
  • the diameter of the left section of the rotor shaft 2 on the right side is smaller than the diameter of the right section, so that when the left section is inserted into the receiving groove, it is limited by the step formed at the diameter change.
  • the compressor rotor assembly includes two impellers 1, the rotor shaft 2 on the left side and one of the impellers 1 can be connected by the connection in the above embodiment, and the rotor shaft 2 on the right side and the other impeller 1 It can also be connected by the connection method in the above embodiment.
  • the impeller 1 and the rotor shaft 2 are assembled or disassembled by using the connection method in the above embodiment, the influence on the connection structure between the two sections of the rotor shaft 2 can be reduced as much as possible to ensure the connection stability and the connection between the two sections of the rotor shaft 2 Reliability, thereby improving the overall reliability of the rotor assembly.
  • the rotor shaft and the impeller are connected by a connecting rod, which is more convenient for installation and disassembly. It solves the problem that the heat sleeve matching method is difficult to disassemble, and at the same time does not require heating equipment, simplifying the impeller assembly process and equipment, effectively improving assembly efficiency, and convenient post-maintenance;
  • a boss is provided on the connecting rod to support the connecting rod and improve the strength of the connecting rod
  • the connecting rod is connected with the impeller and the rotor shaft by thread, which relieves the stress concentration problem compared to the key connection;
  • the connecting rod is a stepped shaft, which effectively positions the connection of the connecting rod, which is beneficial to improve the assembly efficiency;
  • a stepped hole is provided in the lock nut, which effectively ensures that the lock nut is in tight contact with the end surface of the impeller, and achieves a good locking effect.
  • the present disclosure also proposes a compressor including the compressor rotor assembly described above.
  • the compressor also includes a gas bearing, and the compressor rotor assembly is supported on the gas bearing.
  • the compressor may be a centrifugal compressor, and the connection between the impeller and the rotor shaft has high reliability, which is beneficial to improve the refrigeration capacity of the compressor.
  • the present disclosure also provides a refrigerant circulation system including the compressor described above.
  • the refrigerant circulation system may be an air conditioning system or a heat pump system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne un ensemble rotor de compresseur, un compresseur et un système de pompe à chaleur. L'ensemble rotor de compresseur comprend une hélice (1), un arbre de rotor (2) et une bielle (3). Un premier trou de connexion (11) est disposé au niveau de l'hélice(1). Un second trou de connexion (21) est disposé au niveau de l'arbre de rotor (2). Une extrémité de la tige de liaison (3) est insérée dans le premier trou de connexion (11), et est reliée de manière amovible à l'hélice (1). L'autre extrémité de la bielle (3) est insérée dans le second trou de connexion (21), et est reliée de manière amovible à l'arbre de rotor (2). Le compresseur comprend l'ensemble rotor de compresseur. Le dispositif de circulation de fluide réfrigérant comprend le compresseur. L'ensemble rotor de compresseur permet à l'hélice (1) et à l'arbre de rotor (2) d'être installés et détachés de manière commode, ce qui permet de résoudre le problème de l'art dans lequel des composants montés au moyen d'un chauffage ne peuvent pas être facilement détachés. De plus, l'invention n'a pas besoin d'un appareil de chauffage, ce qui simplifie un processus et un appareil utilisé pour assembler une hélice, améliore efficacement l'efficacité de l'ensemble et améliore l'opérabilité par rapport à une maintenance future.
PCT/CN2019/112986 2018-12-25 2019-10-24 Ensemble rotor de compresseur, compresseur et système de circulation de réfrigérant WO2020134432A1 (fr)

Applications Claiming Priority (2)

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CN201811593315.6 2018-12-25
CN201811593315.6A CN111365292A (zh) 2018-12-25 2018-12-25 具有柔性锁紧配合的压缩机转子组件和压缩机

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WO2020134432A1 true WO2020134432A1 (fr) 2020-07-02

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CN207906116U (zh) * 2018-01-22 2018-09-25 石家庄金士顿轴承科技有限公司 用于空气悬浮离心鼓风机的双叶轮拉杆永磁转子结构
CN209340210U (zh) * 2018-12-25 2019-09-03 珠海格力电器股份有限公司 具有柔性锁紧配合的压缩机转子组件、压缩机和冷媒循环系统

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