WO2019090939A1 - 轴承安装固定结构和压缩机 - Google Patents

轴承安装固定结构和压缩机 Download PDF

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Publication number
WO2019090939A1
WO2019090939A1 PCT/CN2017/119456 CN2017119456W WO2019090939A1 WO 2019090939 A1 WO2019090939 A1 WO 2019090939A1 CN 2017119456 W CN2017119456 W CN 2017119456W WO 2019090939 A1 WO2019090939 A1 WO 2019090939A1
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WO
WIPO (PCT)
Prior art keywords
section
axial positioning
fixing structure
bearing mounting
axial
Prior art date
Application number
PCT/CN2017/119456
Other languages
English (en)
French (fr)
Inventor
蒋楠
张治平
钟瑞兴
蒋彩云
陈玉辉
周义
雷连冬
刘增岳
陈健
欧阳鑫望
Original Assignee
格力电器（武汉）有限公司
珠海格力电器股份有限公司
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Application filed by 格力电器（武汉）有限公司, 珠海格力电器股份有限公司 filed Critical 格力电器（武汉）有限公司
Priority to US16/762,228 priority Critical patent/US11280343B2/en
Publication of WO2019090939A1 publication Critical patent/WO2019090939A1/zh

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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
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/059—Roller bearings
    • 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
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/053—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
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/053—Shafts
    • F04D29/054—Arrangements for joining or assembling 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
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • 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
    • F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/50—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/60—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls

Definitions

  • the present disclosure relates to the field of compression equipment technology, and in particular to a bearing mounting fixture and a compressor.
  • the centrifugal compressor is a machine that relies on the rotational speed to generate a pressure difference, and has high stability requirements for the rotational speed.
  • Components on the rotating shaft require reliable positioning and locking to ensure assembly tolerances with the shaft.
  • two parts are required to realize the positioning and locking of a part.
  • the bearing needs to be positioned by the positioning ring and the lock nut.
  • the positioning ring and the shaft are usually assembled by means of a transition fit or an interference fit. Tolerance requirements.
  • the parts required for positioning and locking will increase, which will cause the axial length of the rotating shaft to become larger, the shaft stiffness to decrease, the critical speed to decrease, and the vibration of the rotating shaft to increase during operation, shortening the shaft and cooperating with the shaft.
  • the service life of the part, and this type of installation is likely to result in insufficient axial installation space due to the strict spatial distribution requirements between several parts that require positioning and locking.
  • Bearings and comb-toothed parts are parts that are matched with high-speed rotating shafts.
  • the axial installation distance is usually very close.
  • the spacing between the bearing and the comb-toothed parts cannot be assembled with two positioning and locking parts. .
  • this structural design meets the assembly requirements, but due to the need to machine a separate thread locking fit region, the axial length of the rotating shaft is also large, which reduces the rigidity and critical speed of the shaft.
  • the rotation speed of the high-speed rotating shaft generally reaches tens of thousands of revolutions.
  • the bearings, comb-tooth seals and other parts that cooperate with the rotating shaft need to have high concentricity, verticality and other assembly tolerance requirements, otherwise the wear problem is easy to occur.
  • high assembly technology is required to control the accumulated assembly error within the required range, which makes assembly difficult.
  • a bearing mounting and fixing structure and a compressor are provided, which can ensure the consistency of the assembly standards of the components on the shaft and reduce the assembly difficulty of the components on the shaft.
  • a bearing mounting fixing structure comprising:
  • An axial positioning member is sleeved on the rotatable shaft and includes a fixed connecting portion and an axial positioning portion which are integrated with each other, the fixed connecting portion is detachably fixed on the rotatable shaft, and the axial positioning portion axially stops the bearing .
  • the fixed connection section includes internal threads; and/or
  • the axial positioning section includes a light hole section.
  • the axial positioning member is a hollow stepped shaft
  • the fixed connecting section is located in the large diameter section of the stepped shaft
  • the axial positioning section is located in the small diameter section of the stepped shaft.
  • the outer peripheral side of the large diameter section forms a circumferential sealing surface.
  • the step shaft includes a plurality of steps, and an outer circumferential side of at least two steps of the step shaft having a diameter larger than a diameter of the smallest diameter section thereof is formed with a circumferential sealing surface.
  • One end of the large diameter section is connected to one end of the small diameter section.
  • the projection of the circumferential sealing surface on the central axis of the axial positioning member at least partially overlaps the projection of the fixed connection section on the central axis of the axial positioning member.
  • the outer peripheral side of the fixed connection section forms a circumferential sealing surface.
  • the axial end face of the axial positioning member abuts against the axial end face of the bearing.
  • bearing mounting and fixing structure further comprises a sealing member which is sleeved on the large diameter section and is sealingly engaged with the circumferential sealing surface.
  • a compressor including the above-described bearing mounting and fixing structure.
  • the axial positioning member is integrally formed, and the axial positioning member includes a fixed connecting portion and an axial positioning portion, and the end portion of the axial positioning portion has a positioning end surface.
  • the axial positioning member includes a connecting structure and a positioning structure at the same time, which can simultaneously realize its own fixing and positioning of other parts, so that the axial positioning of other parts in the prior art requires the positioning and locking of the two parts into Only one axial positioning member is needed, so the number of parts can be reduced, the quality control can be improved, and the axial length of the rotating shaft can be reduced, and the rigidity, stability and critical speed of the rotating shaft can be improved. Since the axial positioning member is a unitary structure and includes a connecting structure and a positioning structure, the integral axial positioning member can be used for mounting and fixing the other assembly standard, thereby reducing the assembly difficulty and improving the assembly precision.
  • FIG. 1 is a schematic structural view of an axial positioning member of a bearing mounting and fixing structure according to a first embodiment of the present disclosure
  • FIG. 2 is a schematic view of a bearing mounting and fixing structure of a first embodiment of the present disclosure
  • FIG 3 is a schematic view of a bearing mounting and fixing structure of a second embodiment of the present disclosure.
  • a bearing mounting fixture includes a rotating shaft 7, a bearing 6, and an axial positioning member for axially positioning the bearing 6, characterized in that The bearing 6 and the axial positioning member are sleeved on the rotating shaft 7, and the axial positioning member is integrally formed, and the axial positioning member comprises a fixed connecting portion 1 and an axial positioning portion 2,
  • the fixed connecting section 1 is fixedly connected to the rotating shaft 7
  • the end of the axial positioning section 2 has a positioning end face and cooperates with the bearing 6 .
  • the axial positioning member includes a connecting structure and a positioning structure at the same time, which can simultaneously realize its own mounting and fixing on the rotating shaft 7 and positioning of other parts, so that the axial positioning of other parts in the prior art requires positioning and locking.
  • the way of changing parts can be realized by only one axial positioning member, so the number of parts can be reduced, the quality control can be improved, the axial length of the rotating shaft can be reduced, and the rigidity, stability and critical speed of the rotating shaft can be improved.
  • the axial positioning member is a unitary structure and includes a connecting structure and a positioning structure, the integral axial positioning member can be used for mounting and fixing the other assembly standard, thereby reducing the assembly difficulty and improving the assembly precision.
  • the axial positioning member is integrally formed, when the axial positioning member is fitted and fitted with the rotating shaft 7, the axial positioning member is integrally coaxially fitted and mounted with the rotating shaft 7 directly.
  • the irregular offset generated during the locking process of the two components can be avoided, and the coaxiality caused by the offset in the prior art is also eliminated.
  • the degree of error, that is to say the axial positioning member is integrally formed not only can reduce the parts, but also ensure the coaxiality of the axial positioning member and the rotating shaft 7, greatly reducing the rotation fluctuation, and effectively improving the overall structure. stability.
  • the fixed connecting section 1 of the axial positioning member comprises an internal thread 3, and/or the axial positioning section 2 comprises a bore section.
  • the inner peripheral side of the first end of the axial positioning member is machined with a threaded hole, and the threaded portion of the threaded hole is machined with a thread, and the axial positioning member realizes a fixed connection with the rotating shaft 7 by the thread.
  • the inner peripheral side of the second end of the axial positioning member is a light hole through which the axial positioning member can realize a transition or interference fit between the optical axis and the rotating shaft 7 to ensure the between the axial positioning member and the rotating shaft 7. Concentricity.
  • the second end surface of the axial positioning member is formed with a positioning end surface, and the positioning end surface can be formed with an end surface of the part to be positioned mounted on the rotating shaft 7, thereby forming an axial positioning of the part to be positioned, and the positioning end surface can be more effective.
  • the ground positioning accuracy of the axial positioning member to be positioned is ensured.
  • the axial positioning member is a hollow stepped shaft
  • the fixed connecting section 1 is located in the large diameter section
  • the axial positioning section 2 is located in the small diameter section. Since the fixed connecting section 1 is used to realize a fixed connection between the axial positioning member and the rotating shaft 7, the axial positioning section 2 is used for realizing the axial positioning of the part to be positioned, so that the fixed connecting section 1 is disposed in the large diameter section,
  • the axial positioning section 2 is disposed in the small diameter section, which can effectively ensure the fixed connection structure between the axial positioning component and the rotating shaft 7, and improve the structural strength at the matching position of the axial positioning component and the rotating shaft 7, and at the same time
  • the force of the positioning section mainly comes from the axial direction, and the radial direction force is small, so that the axial positioning section 2 is located in the small diameter section, which can not only ensure the axial positioning accuracy of the axial positioning section 2 to be positioned, The adverse effect on the axial positioning structure strength of the axial positioning section 2 is avoided, and the
  • the inner circumferential surface of the axial positioning section 2 is generally a cylindrical surface, and is assembled with a clearance fit or an interference fit on the outer cylindrical surface of one end of the rotating shaft 7, and is assembled by a hot sleeve process for ensuring the axial positioning part.
  • the positioning end face of the axial positioning section 2 is generally a plane perpendicular to the central axis of the axial positioning section 2, thereby facilitating the axial positioning of the part to be positioned.
  • the outer peripheral surface of the axial positioning member is a cylindrical surface and is generally used to fit the inner cylindrical surface of the bearing or the inner cylindrical surface of the seal member 8 instead of the shaft.
  • the outer peripheral side of the fixed connecting section 1 forms a circumferential sealing surface.
  • the outer circumferential side of the large diameter section forms the circumferential sealing surface 4. Since the diameter of the large diameter section is larger than the diameter of the small diameter section, the circumferential sealing surface 4 is formed on the outer circumferential side of the large diameter section, which can effectively prevent the small diameter section from interfering with the sealing fit structure of the sealing member 8 and the circumferential sealing surface 4, The sealing fit effect of the sealing member 8 and the circumferential sealing surface 4 is effectively ensured.
  • the wall thickness of the fixed joint section 1 is large, and even if the circumferential sealing surface 4 is machined on the outer circumference of the large diameter section, the structural strength of the fixed joint section 1 is not greatly increased.
  • the axial positioning member is integrally formed, the speciality of the structure greatly reduces the fluctuation of the circumferential sealing surface 4 due to the poor concentricity when the axial positioning member rotates, thereby greatly reducing the axial positioning.
  • the step axis is a second-order step, including a large diameter section and a small diameter section, wherein the small diameter section is used for axial positioning of the part to be positioned, and the large diameter section is used.
  • the connection between the axial positioning member and the rotating shaft 7 is fixed, and a circumferential sealing surface 4 for forming a sealing structure with the sealing member 8 is formed on the outer peripheral side of the large diameter portion, which can effectively improve the sealing of the rotating shaft structure. effect.
  • the step shaft includes a plurality of steps, and at least two outer peripheral sides of the step shaft having a diameter larger than the diameter of the minimum diameter are formed with the circumferential sealing surface 4.
  • the step axis is a third-order step, including a large diameter section, a middle diameter section and a small diameter section, wherein the smallest diameter section is used for axial positioning of the part to be positioned, in the large diameter section and
  • the outer peripheral side of the diameter section is formed with a circumferential sealing surface 4, so that it can be used for axial positioning of a plurality of parts and sealing engagement with the shaft at the same time.
  • This structure is especially suitable for short axial distances between multiple rotating parts. The assembly can solve the problem of assembly difficulty and improve the assembly precision.
  • the intermediate connecting section 5 between the large diameter section and the small diameter section is a conical section; or the large diameter section is directly connected to the small diameter section.
  • the projection of the circumferential sealing surface 4 on the central axis of the axial positioning member at least partially overlaps the projection of the fixed connection section 1 on the central axis of the axial positioning member.
  • the bearing mounting fixing structure of the present disclosure can simultaneously be used for assembly positioning of a plurality of parts (such as bearings, comb seals, etc.) that are mated with the shaft within a limited axial length, and is assembled and assembled by using the same part.
  • the standard is unified. Compared with the assembly positioning of multiple parts, the cumulative assembly error is greatly reduced. By limiting the geometrical tolerance of the axial positioning parts, it is easier to achieve high assembly accuracy requirements for multiple matching parts with the shaft.
  • the bearing mounting and fixing structure further comprises a rotating shaft 7 , and the bearing 6 and the axial positioning member are sleeved on the rotating shaft 7 , and the fixed connecting portion 1 of the axial positioning member is fixedly connected with the rotating shaft 7 , The positioning end face of the axial positioning member stops on the end face of the bearing 6.
  • the bearing mounting and fixing structure further includes a sealing member 8 which is sleeved on the sealing member 8
  • the axial positioning member is outside the large diameter section and is in sealing engagement with the circumferential sealing surface 4. Since the seal fitting portion and the connecting portion of the axial positioning member each achieve a different position at which the function is required to be disposed on the axial positioning member, the connecting portion can be formed on the inner peripheral side of the fixed connecting portion at the outer periphery of the fixed connecting portion.
  • the side forms the sealing fitting portion, and the functions of both are integrated on the same segment structure, so that the structure of the fixed connecting segment is more fully and effectively utilized, so that the fixed connection and the sealing of the axial positioning member are located in the same segment structure.
  • both the locking thread and the circumferential sealing surface are designed inside the positioning structure which cannot shorten the axial length, so that the axial length of the rotating shaft 7 is not increased, which is advantageous for improving the rotation stability of the rotating shaft 7.
  • the seal 8 is, for example, a comb structure.
  • the inner circumferential surface of the axial positioning section 2 of the axial positioning member and the outer circumferential surface of the rotary shaft 7 are in a form-fitting or interference fit.
  • the compressor includes a bearing mounting fixing structure which is the above-described bearing mounting fixing structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Compressor (AREA)

Abstract

一种轴承安装固定结构和压缩机，该轴承安装固定结构包括：可旋转轴(7)；轴承(6)，套设在可旋转轴(7)上；以及轴向定位件，其套设在可旋转轴(7)上并且包括彼此成一体的固定连接段(1)和轴向定位段(2)，固定连接段(1)可拆卸地固定在可旋转轴(7)上，轴向定位段(2)轴向地止挡轴承(6)。该轴承安装固定结构能够保证轴上零件装配基准的一致性，降低轴上零件的装配难度。

Description

轴承安装固定结构和压缩机
本申请是以CN申请号为201711118125.4，申请日为2017年11月13的申请为基础，并主张其优先权，该CN申请的公开内容在此作为整体引入本申请中。
技术领域
本公开涉及压缩设备技术领域，具体而言，涉及一种轴承安装固定结构和压缩机。
背景技术
离心式压缩机是依靠转速产生压力差的机械，对转速的稳定性要求高。旋转轴上的零部件都需要进行可靠的定位和锁紧，才能保证与轴的装配公差。通常情况下，实现一个零件的定位和锁紧需要两个零件，以轴承为例，需要通过定位环和锁紧螺母配合进行定位，其中定位环与轴通常采用过渡配合或过盈配合方式保证装配公差要求。零件多的时候，定位和锁紧所需的零件递增，就会导致旋转轴轴向长度变大，轴刚度降低，临界转速降低，运行过程中旋转轴振动加大，缩短轴以及与轴配合的零件的使用寿命，而且这样的安装方式很可能由于需要定位和锁紧的几个零件之间存在严格的空间分布要求导致轴向安装空间不够。
轴承和梳齿密封类零件，都是与高速旋转轴配合的零件，通常轴向安装距离非常近，轴承和梳齿密封类零件之间的间距无法满足分别用两个定位、锁紧零件进行装配。由于存在安装困难的问题，现有技术中，通常采用一个长定位环和一个锁紧螺母的形式满足这两个零件的定位和锁紧要求。但同样的，这种结构设计虽然满足装配需求，但由于需要加工出单独的螺纹锁紧配合区域，也会导致旋转轴轴向长度偏大，降低了轴的刚度和临界转速。
高速旋转轴的转速一般达到上万转，与旋转轴配合的轴承、梳齿密封等零件需要与轴有很高的同心度、垂直度等装配公差要求，不然很容易出现磨损问题。在这些零件采用各自的定位、锁紧零件装配时，由于装配基准是不一致的，需要很高的装配技术才能将累计装配误差控制在要求范围内，造成装配困难。
发明内容
本发明实施例中提供一种轴承安装固定结构和压缩机，能够保证轴上零件装配基 准的一致性，降低轴上零件的装配难度。
根据本公开的一个方面，提供了一种轴承安装固定结构，轴承安装固定结构包括：
可旋转轴；
轴承，套设在可旋转轴上；以及
轴向定位件，套设在可旋转轴上并且包括彼此成一体的固定连接段和轴向定位段，固定连接段可拆卸地固定在可旋转轴上，轴向定位段轴向地止挡轴承。
进一步地，
固定连接段包括内螺纹；和/或
轴向定位段包括光孔段。
进一步地，轴向定位件为中空的台阶轴，固定连接段位于台阶轴的大径段，轴向定位段位于台阶轴的小径段。
进一步地，大径段的外周侧形成周向密封面。
进一步地，台阶轴包括多个台阶，台阶轴的直径大于其最小径段的直径的至少两个台阶的外周侧形成有周向密封面。
进一步地，
大径段和小径段之间设有圆锥形的中间连接径段；或
大径段的一端与小径段的一端连接。
进一步地，周向密封面在轴向定位件的中心轴线上的投影与固定连接段在轴向定位件的中心轴线上的投影至少部分重叠。
进一步地，固定连接段的外周侧形成周向密封面。
进一步地，轴向定位件的轴向端面抵靠着轴承的轴向端面。
进一步地，轴承安装固定结构还包括密封件，密封件套设在大径段上，并与周向密封面密封配合。
进一步地，轴向定位段与可旋转轴之间为过渡配合或者过盈配合。
根据本公开的再一方面，提供了一种压缩机，压缩机包括上述的轴承安装固定结构。
应用本公开的技术方案，轴向定位件一体成型，轴向定位件包括固定连接段和轴向定位段，轴向定位段的端部具有定位端面。该轴向定位件同时包括连接结构和定位结构，能够同时实现自身的固定和对其他零件的定位，使得现有技术中对其他零件进行轴向定位需要定位和锁紧两个零件的方式转变为仅需一个轴向定位件即可实现，因 此可以减少零件数目，提高质量控制，同时减小旋转轴轴向长度，提高旋转轴刚度、稳定性和临界转速。由于轴向定位件为一体结构且包括连接结构和定位结构，因此可以通过一体的轴向定位件为其他零件的安装固定统一装配基准，降低装配难度，同时提高装配精度。
上述说明仅是本公开技术方案的概述，为了能够更清楚了解本公开的技术手段，并可依照说明书的内容予以实施，以下以本公开的较佳实施例并配合附图详细说明如后。
附图说明
图1是本公开第一实施例的轴承安装固定结构的轴向定位件的结构示意图；
图2是本公开第一实施例的轴承安装固定结构的示意图；
图3是本公开第二实施例的轴承安装固定结构的示意图。
附图标记说明：1、固定连接段；2、轴向定位段；3、内螺纹；4、周向密封面；5、中间连接段；6、轴承；7、旋转轴；8、密封件。
具体实施方式
为更进一步阐述本公开为达成预定公开目的所采取的技术手段及功效，以下结合附图及较佳实施例，对依据本公开申请的具体实施方式、结构、特征及其功效，详细说明如后。在下述说明中，不同的“一实施例”或“实施例”指的不一定是同一实施例。此外，一或多个实施例中的特定特征、结构、或特点可由任何合适形式组合。
下面结合附图和具体实施例对本公开作进一步详细描述，但不作为对本公开的限定。
结合参见图1至图3所示，根据本公开的第一实施例，轴承安装固定结构，包括旋转轴7、轴承6和对所述轴承6进行轴向定位的轴向定位件，其特征在于，所述轴承6和所述轴向定位件均套设在所述旋转轴7上，所述轴向定位件一体成型，所述轴向定位件包括固定连接段1和轴向定位段2，所述固定连接段1与所述旋转轴7固定连接，所述轴向定位段2的端部具有定位端面并与所述轴承6配合。
该轴向定位件同时包括连接结构和定位结构，能够同时实现自身在旋转轴7上的安装固定和对其他零件的定位，使得现有技术中对其他零件进行轴向定位需要定位和锁紧两个零件的方式转变为仅需一个轴向定位件即可实现，因此可以减少零件数目， 提高质量控制，同时减小旋转轴轴向长度，提高旋转轴刚度、稳定性和临界转速。由于轴向定位件为一体结构且包括连接结构和定位结构，因此可以通过一体的轴向定位件为其他零件的安装固定统一装配基准，降低装配难度，同时提高装配精度。
而且，需要特殊说明的是，由于轴向定位件是一体成型，轴向定位件与旋转轴7进行安装配合时，轴向定位件整体与旋转轴7直接进行同轴配合和安装，这样的结构相对于现有技术中分体结构分别定位和锁紧的情况来说，可以避免在两个部件锁紧过程中产生的不规则偏移，也消除了现有技术中偏移带来的同轴度误差，也就是说轴向定位件设置成一体成型不仅可以减少零件，而且还能保证轴向定位件与旋转轴7的同轴度，大幅度降低了转动波动，有效地提高了整体结构的稳定性。
在一可选的实施例中，轴向定位件的固定连接段1包括内螺纹3，和/或，轴向定位段2包括光孔段。在本实施例中，轴向定位件的第一端内周侧加工有螺纹孔，螺纹孔的螺纹区加工有螺纹，轴向定位件通过该螺纹实现与旋转轴7之间的固定连接。轴向定位件的第二端内周侧为光孔，轴向定位件能够通过该光孔与旋转轴7之间实现过渡或者过盈配合，从而保证轴向定位件和旋转轴7之间的同轴度。轴向定位件的第二端端面形成有定位端面，可以通过该定位端面与安装在旋转轴7上的待定位零件形成端面配合，从而对该待定位零件形成轴向定位，定位端面能够更加有效地保证轴向定位件对待定位零件的轴向定位精度。
在一可选的实施例中，轴向定位件为中空的台阶轴，固定连接段1位于大径段，轴向定位段2位于小径段。由于固定连接段1用于实现轴向定位件与旋转轴7之间的固定连接，轴向定位段2用于实现对待定位零件的轴向定位，因此将固定连接段1设置在大径段，将轴向定位段2设置在小径段，可以有效保证轴向定位件与旋转轴7之间的固定连接结构，提高轴向定位件与旋转轴7的配合位置处的结构强度，同时由于轴向定位段的受力主要来自于轴向方向，受到的径向方向作用力较小，因此使得轴向定位段2位于小径段，不仅可以保证轴向定位段2对待定位零件的轴向定位精度，避免对轴向定位段2的轴向定位结构强度造成不利影响，而且可以减小轴向定位段2的材料耗费，节省材料，降低轴向定位件的成本。
轴向定位段2的内周面通常是圆柱面，与旋转轴7上的一端外圆柱面采用间隙配合或者是过盈配合的装配方式，采用热套工艺进行装配，用于保证轴向定位件与旋转轴7的同轴度，轴向定位段2的定位端面一般为垂直于轴向定位段2的中心轴线的平面，从而更加便于实现对待定位零件的轴向定位。轴向定位件的外周面为圆柱面，通 常用于与轴承的内圆柱面或者密封件8的内圆柱面配合，代替轴使用。
在一可选的实施例中，固定连接段1的外周侧形成周向密封面。而在本实施例中，大径段的外周侧形成周向密封面4。由于大径段的直径大于小径段的直径，因此，在大径段的外周侧形成周向密封面4，可以有效避免小径段对密封件8与周向密封面4的密封配合结构造成干涉，有效保证密封件8与周向密封面4的密封配合效果。同时，由于大径段的直径较大，使得固定连接段1的壁厚较大，即使在大径段的外周加工周向密封面4，也不会对固定连接段1的结构强度造成较大的不利影响。另外需要强调的是，由于轴向定位件是一体成型，结构的特殊性大幅降低了轴向定位件旋转时周向密封面4因同心度不好而产生的波动，从而大大降低了轴向定位件的周向密封面4与密封梳齿发生摩擦的可能性。
结合参见图2所示，根据本公开的第一实施例，台阶轴为二阶台阶，包括一个大径段和一个小径段，其中小径段用于对待定位零件进行轴向定位，大径段用于实现轴向定位件与旋转轴7之间的连接固定，同时在大径段的外周侧形成有用于与密封件8形成密封结构的周向密封面4，可以有效的提高旋转轴结构的密封效果。
结合参见图3所示，根据本公开的第二实施例，台阶轴包括多个台阶，至少两个直径大于最小径段直径的台阶轴外周侧形成有周向密封面4。在本实施例中，台阶轴为三阶台阶，包括一个大径段、一个中径段和一个小径段，其中直径最小的小径段用于对待定位零件进行轴向定位，在大径段和中径段的外周侧均形成有周向密封面4，从而可以同时用于多个零件的轴向定位和与轴的密封配合，此结构尤其适用于短的轴向距离内多旋转类零件之间的装配，可解决装配困难的问题，而且可提高装配精度。
在一个可选实施例中，大径段和小径段之间的中间连接段5为圆锥段；或，大径段与小径段直接连接。
在一个可选实施例中，周向密封面4在轴向定位件的中心轴线上的投影与固定连接段1在轴向定位件的中心轴线上的投影至少部分重叠。如此一来，就能够充分利用轴向定位件通过内周侧与旋转轴7之间实现固定连接，通过外周侧实现密封配合的结构特点，使得轴向定位件的密封配合部和连接部均位于同一段。
本公开的轴承安装固定结构，可在有限的轴向长度内同时用于多个与轴配合的零件(例如轴承、梳齿密封等)的装配定位，并且由于采用同一个零件进行装配定位，装配基准统一，相较于用多个零件的装配定位，大大减小了累计装配误差，通过限制轴向定位件的形位公差，可以更容易的实现多个与轴配合零件的高装配精度要求。
在一个可选实施例中，轴承安装固定结构还包括旋转轴7，轴承6和轴向定位件均套设在旋转轴7上，轴向定位件的固定连接段1与旋转轴7固定连接，轴向定位件的定位端面止挡在轴承6的端面上。
在一个可选实施例中，当轴向定位件为中空的台阶轴，且大径段的外周侧形成周向密封面4时，轴承安装固定结构还包括密封件8，密封件8套设在轴向定位件的大径段外，并与周向密封面4密封配合。由于轴向定位件的密封配合部和连接部各自实现其功能在轴向定位件上所需设置的位置不同，因此可以通过在固定连接段的内周侧形成连接部，在固定连接段的外周侧形成密封配合部的方式，将两者的功能均集成在同一段结构上，使得固定连接段的结构的得到更加充分有效的利用，使得轴向定位件的固定连接和密封均位于同一段结构上，无需沿轴向分别设置在不同的轴段上，因此能够缩短轴向定位件与旋转轴7之间的轴向配合长度，使得轴向定位件在兼具轴向定位和锁紧功能的同时，将锁紧螺纹和周向密封面均设计在无法缩短轴向长度的定位结构内部，这样不会增大旋转轴7的轴向长度，有利于提高旋转轴7的旋转稳定性。该密封件8例如为梳齿结构。
在一个可选实施例中，轴向定位件的轴向定位段2的内周面与旋转轴7的外周面之间过渡配合或者过盈配合。
根据本公开的实施例，压缩机包括轴承安装固定结构，该轴承安装固定结构为上述的轴承安装固定结构。
以上所述，仅是本公开的较佳实施例而已，并非对本公开作任何形式上的限制，依据本公开的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本公开技术方案的范围内。

Claims (12)

  1. 一种轴承安装固定结构，包括：
    可旋转轴(7)；
    轴承(6)，套设在所述可旋转轴(7)上；以及
    轴向定位件(1，2)，套设在所述可旋转轴(7)上并且包括彼此成一体的固定连接段(1)和轴向定位段(2)，所述固定连接段(1)可拆卸地固定在所述可旋转轴(7)上，所述轴向定位段(2)轴向地止挡所述轴承(6)。
  2. 根据权利要求1所述的轴承安装固定结构，其中，
    所述固定连接段(1)包括内螺纹(3)；和/或
    所述轴向定位段(2)包括光孔段。
  3. 根据权利要求1所述的轴承安装固定结构，其中所述轴向定位件(1，2)为中空的台阶轴，所述固定连接段(1)位于所述台阶轴的大径段，所述轴向定位段(2)位于所述台阶轴的小径段。
  4. 根据权利要求3所述的轴承安装固定结构，其中所述大径段的外周侧形成周向密封面(4)。
  5. 根据权利要求4所述的轴承安装固定结构，其中所述台阶轴包括多个台阶，所述台阶轴的直径大于其最小径段的直径的至少两个台阶的外周侧形成有所述周向密封面(4)。
  6. 根据权利要求3所述的轴承安装固定结构，其中，
    所述大径段和所述小径段之间设有圆锥形的中间连接径段(5)；或
    所述大径段的一端与所述小径段的一端连接。
  7. 根据权利要求4所述的轴承安装固定结构，其中所述周向密封面(4)在所述轴向定位件的中心轴线上的投影与所述固定连接段(1)在所述轴向定位件的中心轴 线上的投影至少部分重叠。
  8. 根据权利要求1所述的轴承安装固定结构，其中所述固定连接段(1)的外周侧形成周向密封面(4)。
  9. 根据权利要求1所述的轴承安装固定结构，其中所述轴向定位件(1，2)的轴向端面抵靠着所述轴承(6)的轴向端面。
  10. 根据权利要求4所述的轴承安装固定结构，还包括密封件(8)，所述密封件(8)套设在所述大径段上，并与所述周向密封面(4)密封配合。
  11. 根据权利要求1所述的轴承安装固定结构，其中所述轴向定位段(2)与所述可旋转轴(7)之间为过渡配合或者过盈配合。
  12. 一种压缩机，包括权利要求1所述的轴承安装固定结构。
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