EP3208471A1 - Spiralstruktur, zentrifugalverdichter und kühlvorrichtung - Google Patents

Spiralstruktur, zentrifugalverdichter und kühlvorrichtung Download PDF

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Publication number
EP3208471A1
EP3208471A1 EP14903991.9A EP14903991A EP3208471A1 EP 3208471 A1 EP3208471 A1 EP 3208471A1 EP 14903991 A EP14903991 A EP 14903991A EP 3208471 A1 EP3208471 A1 EP 3208471A1
Authority
EP
European Patent Office
Prior art keywords
volute
centrifugal compressor
stage
backflow device
present application
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP14903991.9A
Other languages
English (en)
French (fr)
Other versions
EP3208471A4 (de
Inventor
Jianfei Liu
Zhiping Zhang
Ruixing Zhong
Nan Jiang
Caiyun JIANG
Rong Xie
Yuhui Chen
Baoqian Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
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 Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Publication of EP3208471A1 publication Critical patent/EP3208471A1/de
Publication of EP3208471A4 publication Critical patent/EP3208471A4/de
Ceased legal-status Critical Current

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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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers 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
    • F04D17/12—Multi-stage 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
    • F04D17/12—Multi-stage pumps
    • F04D17/122—Multi-stage pumps the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage 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
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/403—Casings; Connections of working fluid 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for 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
    • 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 application relates to refrigerant equipment, and more specifically relates to a volute structure, a centrifugal compressor and a refrigerant equipment.
  • a pneumatic part of multi-stage compression is always made very compact.
  • the pneumatic part of a centrifugal compressor includes many components, such that it is very difficult to arrange the components of the pneumatic part of the centrifugal compressor.
  • the volute is very close to a curve passage behind a first-stage diffuser outlet, such that the structure is not satisfied.
  • Fig. 1 is a schematic diagram of a layout of a pneumatic part of a volute front tilting-type double-stage centrifugal compressor, in which an internal arc cavity of the volute faces downstream of air flow.
  • the centrifugal type compressor pneumatic part mainly comprises a deflector, a first-stage impeller, a first-stage diffuser, a curve passage, a backflow device, a second-stage impeller, a second-stage diffuser, and a volute 21.
  • the centrifugal compressor comprises a main shaft 20 and the volute 21.
  • the curve passage is arranged as far as possible from the volute 21 by narrowing the length of the first-stage diffuser, while increasing the cantilever end length of the main shaft 20.
  • the inventors find that the prior art at least has the following drawbacks: narrowing the length of the first-stage diffuser section will result in that the gas entering the centrifugal compressor cannot be sufficiently diffused, which will deteriorate the performance of the centrifugal compressor. Further, increasing the length of the main shaft 20 results in reduction of the threshold rotating speed, deterioration of the operation stability, and degradation of performance of the compressor.
  • One of objectives of the present application is to provide a volute structure, a centrifugal compressor, and a refrigerant device, for optimizing a pneumatic structure of the existing centrifugal compressor, and enhancing unit performance and stability of the compressor.
  • the present application provides a volute structure, comprising: a cabinet, a volute housing, and a backflow device; the volute housing comprising an inner volute and an outer volute which are separately provided, a fluid passage being formed between the inner volute and the outer volute; and the inner volute being arranged with the backflow device.
  • the inner volute and the backflow device are casted integrally.
  • outer volute and the cabinet are casted integrally.
  • a connection portion between the inner volute and the outer volute is rounded.
  • the volute structure further comprises a curve passage that is fixed on backflow device.
  • the curve passage and the backflow device are casted integrally.
  • the present application further provides a centrifugal compressor, comprising a volute structure according to the present application
  • the centrifugal compressor also comprises a housing, and the volute structure further comprises a one-stage diffuser; and the housing, the cabinet, the one-stage diffuser, and the backflow device enclose a one-stage gas supply cavity.
  • the centrifugal compressor is a double-stage or multi-stage centrifugal compressor.
  • the present application further provides a refrigerant device, comprising a centrifugal compressor according to the present application.
  • the volute housing is divided into two separate parts: an inner volute and an outer volute.
  • the inner volute and the backflow device are arranged together, which saves the space occupied by the inner volute and the backflow device, downsizes the structure of connecting the volute, backflow device, and curve linkage, such that the volute housing and the curve are arranged close enough in the structure.
  • it guarantees enough length of the first-stage diffuser and improves the diffusion effect of the gas entering into the first-stage diffuser, thereby enhancing unit performance and the operation stability of the centrifugal compressor.
  • the technical solution also shortens the length of a main shaft, thereby raising the threshold rotating speed of the rotary part of the compressor, enhancing the operation stability and compressor performance of the centrifugal compressor.
  • Front and rear in the present disclosure reference the air flow direction of the volute structure, i.e., upstream of the air flow is front, namely the left side of Fig. 2 ; while downstream of the air flow is rear, i.e., right side of Fig. 2 .
  • the embodiment of the present application provides a volute structure, which is preferably applied to a centrifugal compressor and the like.
  • the volute structure is configured to be a front tilting type volute structural (as shown in fig.2 , internal curve cavity of the volute housing 7 faces the upstream of the air flow, i.e. left side of fig.2 ), or a rear tilting type volute structural.
  • the volute structural is preferably applied to double-stage centrifugal compressor or a last stage of the multi-stage centrifugal compressor in which the volute housing is located, such that the centrifugal compressor structure is more compact, and the stability and unit performance of the centrifugal compressor are enhanced.
  • the volute structure comprises a cabinet 8, a volute housing 7, and a backflow device 5.
  • the volute housing 7 includes an inner volute and an outer volute, which are separately provided.
  • a fluid passage is formed between the inner volute and the outer volute, for fluids to pass through.
  • the inner volute and the backflow device 5 are arranged together.
  • volute housing 7 is circumferentially split into two parts: inner volute and outer volute.
  • the inner volute and the backflow device 5 are arranged together in at least the following manners: the inner volute and the backflow device 5 are fixedly connected, or the two are of an integral structure.
  • the volute housing is divided into two separate parts: an inner volute and an outer volute.
  • the inner volute and the backflow device are arranged together, which saves the space occupied by the inner volute and the backflow device, downsize the structure of fixing the volute, backflow device, and curve linkage, such that the volute housing and the curve may arranged close enough in the structure.
  • it guarantees enough length of the first-stage diffuse and improves the diffusion effect of the gas entering into the first-stage diffuser, thereby enhancing unit performance of the centrifugal compressor and the operation stability of the centrifugal compressor.
  • the technical solution above also shortens the length of main shaft, thereby raising the threshold rotating speed of the rotary part of the compressor, enhancing the operation stability and compressor performance of the centrifugal compressor.
  • the inner volute and the backflow device are arranged together, which reduces the number of components, such that while the pneumatic part of the centrifugal compressor maintains a compact structure, parameters of the components of the pneumatic part will be coordinated more reasonably with a better pneumatic performance.
  • the threshold rotating speed of the centrifugal compressor is related to the main shaft length of the centrifugal compressor.
  • positions of the outer volute and the inner volute may be arranged more reasonably without changing the main shaft length of the centrifugal compressor, i.e., arrangement of the volute housing may be made without affecting the threshold rotating speed and the unit performance of the centrifugal compressor.
  • the main shaft length may be shortened based on the existing mechanism, with an enhanced compressor threshold rotating speed. Enhance of the threshold rotating speed results in enhancement of the compressor stability, meanwhile the length of the main shaft is shortened, the bearing length or diameter is be shortened, the power consumption is reduced and the compressor performance is enhanced.
  • the shape of the volute will not change by dividing the volute housing into separate inner volute and outer volute, thereby not affecting the pneumatic performance of the volute.
  • the volute casting process would be simplified.
  • an existing digital control processing center may be employed for secondary processing of the inner volute based on casting, which enhances unit performance and cabinet universality, thereby facilitating universality between different machine models, further reducing the molding times and expenses of new boxes.
  • volute structure further comprises a curve passage 4 provided on the backflow device 5.
  • the inner volute and the curve 4 are simultaneously fixed to the backflow device 5, which saves an air supply pipeline disposed between the curve passage and the backflow device in the existing centrifugal compressor, such that the curve passage and the inner volute would be arranged more compact in structure, thereby further compacting the structure of a double-stage or multi-stage centrifugal compressor.
  • a integral type volute structure is usually employed in the prior art, such that in order to mount a backflow device and avoid too small distance between the curve passage and the volute (i.e., the distance of the apex of the curve passage from the nearest point of volute housing along a main shaft direction), the axial length of the main shaft has to be lengthened, which would reduce the threshold rotary speed of the compressor, thereby reducing stability of the compressor.
  • the inner volute and the backflow device 5 are formed into an integral structure through casting, i.e., the arc shape of the inner volute is formed at an external side of the backflow device 5.
  • the inner volute is arranged on the backflow device 5.
  • a profile of the inner volute would be processed by a current processing center, which expands the structure of the volute, such that the volute would be better matched with other pneumatic elements (impeller, diffuser) with a better performance, without changing the volute structure at the ease of arranging the structure, which might affect the pneumatic performance.
  • the curve 4 and the backflow device 5 could also be casted into an integral structure.
  • the outer volute and the cabinet 8 are casted into an integral structure, i.e., the arc shape of the outer volute is formed at an inner side of the box 8.
  • a improved volute profile may be adopted in the overall arrange, without changing the volute structure at the ease of arranging the structure, which might affect the pneumatic performance.
  • the inner volute and the backflow device 5 are of an integral structure
  • the inner volute and the cabinet 8 are of an integral structure, which may also be understood as such that the backflow device 5 and the cabinet 8 together form a volute housing 7.
  • the outer volute is disposed on the cabinet 8
  • the inner volute is disposed on the backflow device 5.
  • connection part between the inner volute and the outer volute is rounded so as to avoid connection displacement therebetween.
  • Embodiments of the present application further provide a centrifugal compressor, comprising a volute structure according to any technical solution of the present application.
  • the entire centrifugal compressor mainly comprises a casing 1, a first-stage impellor 2, a first-stage diffuser 3, a curve passage 4, a backflow device 5, a second-stage impellor 6, a second-stage diffuser 10, a volute housing 7, and a cabinet 8.
  • volute front tilting means that volute tilts to the air inlet side (left side of Fig. 2 ).
  • the air flow sequentially enters into the first-stage impellor 2, the first-stage diffuser 3, curve passage 4, second-stage impellor 6, second-stage diffuser 10, and volute housing 7, finally implementing air pressure boost.
  • the volute structure is one of important components of pneumatic parts of the centrifugal compressor. Besides the volute structure, the centrifugal compressor pneumatic parts further comprises an impellor and a pneumatic motor.
  • the centrifugal compressor further comprises a casing 1.
  • the volute structure further comprises a first-stage diffuser 3.
  • the casing 1, the cabinet 8, the first-stage diffuser 3 and the backflow device 5 enclose a first-stage air supply cavity 9.
  • the cabinet 8 not only forms the volute housing 7 but also forms a first-stage air supply cavity 9.
  • the centrifugal compressor changes a position of setting the first-stage air supply cavity 9.
  • the casing 1, the cabinet 8, the first-stage diffuser 3 and the backflow device 5 enclose the first-stage air supply cavity 9, such that an air supply function may be implemented without adding an air supply part.
  • the centrifugal compressor is a double-stage or multi-stage centrifugal compressor.
  • Embodiments of the present application further provide a refrigerant equipment, comprising a centrifugal compressor provided according to any technical solution of the present application.
  • a refrigerant equipment having the centrifugal compressor has a more compact centrifugal compressor pneumatic structure with a better operation stability of the compressor and a better pneumatic performance.
  • the refrigerant equipment comprises air condition units.
  • orientations or positional relationships indicated by terms like “center”, “longitudinal”, “transversal”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top” “bottom”, “inner”, “outer” and others are based on the orientations or positional relationships illustrated in the accompanying drawings, which are only for facilitating depiction of the present application and simplifying the depiction, rather than indicating or suggesting that the specified means or elements must have specific orientations or have to be constructed and operated with the specific orientations; Therefore, they should not be understood as limitation to the protection scope of the present application.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
EP14903991.9A 2014-10-16 2014-12-26 Spiralstruktur, zentrifugalverdichter und kühlvorrichtung Ceased EP3208471A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410549697.8A CN104454652B (zh) 2014-10-16 2014-10-16 蜗壳结构、离心式压缩机及制冷设备
PCT/CN2014/095093 WO2016058271A1 (zh) 2014-10-16 2014-12-26 蜗壳结构、离心式压缩机及制冷设备

Publications (2)

Publication Number Publication Date
EP3208471A1 true EP3208471A1 (de) 2017-08-23
EP3208471A4 EP3208471A4 (de) 2018-05-30

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EP14903991.9A Ceased EP3208471A4 (de) 2014-10-16 2014-12-26 Spiralstruktur, zentrifugalverdichter und kühlvorrichtung

Country Status (4)

Country Link
US (1) US20170306981A1 (de)
EP (1) EP3208471A4 (de)
CN (1) CN104454652B (de)
WO (2) WO2016058271A1 (de)

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CN105114327A (zh) * 2015-09-15 2015-12-02 珠海格力电器股份有限公司 多级压缩机及具有其的制冷系统
CN105240320B (zh) 2015-10-15 2019-01-22 珠海格力电器股份有限公司 一种离心式压缩机补气结构及压缩机
EP3421808B1 (de) * 2016-03-28 2020-01-22 Mitsubishi Heavy Industries Compressor Corporation Drehkompressormaschine
CN106762841B (zh) * 2016-12-05 2020-06-30 珠海格力电器股份有限公司 一种回流器与扩压器一体化结构及离心压缩机
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CN204175653U (zh) * 2014-10-16 2015-02-25 珠海格力电器股份有限公司 蜗壳结构、离心式压缩机及制冷设备
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Also Published As

Publication number Publication date
EP3208471A4 (de) 2018-05-30
CN104454652A (zh) 2015-03-25
US20170306981A1 (en) 2017-10-26
CN104454652B (zh) 2017-07-25
WO2016058379A1 (zh) 2016-04-21
WO2016058271A1 (zh) 2016-04-21

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