CN111503042A - Centrifugal compressor for hydrogen fuel cell - Google Patents

Centrifugal compressor for hydrogen fuel cell Download PDF

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Publication number
CN111503042A
CN111503042A CN202010296087.7A CN202010296087A CN111503042A CN 111503042 A CN111503042 A CN 111503042A CN 202010296087 A CN202010296087 A CN 202010296087A CN 111503042 A CN111503042 A CN 111503042A
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CN
China
Prior art keywords
shell body
impeller
magnetic steel
inner cavity
sealing plate
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Pending
Application number
CN202010296087.7A
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Chinese (zh)
Inventor
刘军
张旭朋
沈小龙
黄勇
姚嘉琦
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Jintongling Technology Group Co ltd
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Jintongling Technology Group Co ltd
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Application filed by Jintongling Technology Group Co ltd filed Critical Jintongling Technology Group Co ltd
Priority to CN202010296087.7A priority Critical patent/CN111503042A/en
Publication of CN111503042A publication Critical patent/CN111503042A/en
Pending legal-status Critical Current

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    • 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
    • F04D29/4226—Fan casings
    • 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
    • F04D29/057—Bearings hydrostatic; hydrodynamic
    • 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
    • F04D29/058—Bearings magnetic; electromagnetic
    • 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
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/122—Shaft sealings using sealing-rings 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
    • F04D29/44—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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a centrifugal compressor for a hydrogen fuel cell, which comprises a shell assembly, a motor stator, a thrust disc, a thrust bearing, a radial bearing, a first shaft sleeve, a pull rod, a second shaft sleeve, an impeller, a nut and a motor rotor, wherein the motor stator is arranged on the shell assembly; a motor stator is arranged in the shell assembly, and a motor rotor is inserted in an inner cavity of the motor stator; the two ends of the motor rotor are respectively sleeved with a pull rod, a nut, a thrust disc and a first shaft sleeve are sequentially sleeved on one pull rod on the left side from left to right coaxially, and the thrust disc is axially locked and fixed through the nut; a nut, an impeller and a second shaft sleeve are sequentially sleeved on one pull rod on the right from right to left coaxially, and the impeller is axially locked and fixed through the nut; thrust bearings are symmetrically arranged on two sides of the thrust disc, and radial bearings are sleeved on the first shaft sleeve and the second shaft sleeve respectively. The invention has scientific and reasonable structural design, and reduces the size and the weight of the whole machine through the integrated design of the shell.

Description

Centrifugal compressor for hydrogen fuel cell
Technical Field
The invention relates to the field of hydrogen fuel cells, in particular to a centrifugal compressor for a hydrogen fuel cell.
Background
The air compressor is an important component of the fuel cell and provides oxygen required for the reaction to the stack.
The centrifugal compressor rotor assembly for the hydrogen fuel cell generally integrates a motor rotor and a main shaft, the shaft end of the main shaft is fixedly connected with a centrifugal impeller, and the impeller is arranged in a volute; when the motor rotor rotates at a high speed, the impeller drives gas to rotate at a high speed, the gas and the volute interact to generate high-pressure air, and the bearing provides support for the main shaft-impeller integrated rotating component; and labyrinth seal is adopted between the rotor and the stator to prevent gas leakage.
In order to improve the pressure and flow of the output air of the centrifugal compressor, the rotating speed of the centrifugal compressor is often high, but the existing traditional rolling or sliding oil lubricating bearing is difficult to meet the requirements and cannot meet the requirements of an oil-free working environment of a fuel cell engine; but also the rotor heating or rotor dynamic stability issues, which all put higher demands on the bearings and motor heat dissipation, need to be considered and solved in the specific design of the centrifugal compressor.
Disclosure of Invention
The invention aims to provide a centrifugal compressor for a hydrogen fuel cell, which has scientific and reasonable structural design and reduces the size and the weight of the whole compressor through the integrated design of a shell.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention relates to a centrifugal compressor for a hydrogen fuel cell, which has the innovation points that: the device comprises a shell assembly, a motor stator, a thrust disc, a thrust bearing, a radial bearing, a first shaft sleeve, a pull rod, a second shaft sleeve, an impeller, a nut and a motor rotor; a motor stator is horizontally and fixedly arranged in the shell assembly, a motor rotor is inserted into an inner cavity of the motor stator, two ends of the motor rotor respectively vertically extend out of the motor stator, and the motor stator and the motor rotor are in free rotary connection; pull rods are respectively sleeved on the end faces of the left end and the right end of the motor rotor in a coaxial manner, a nut, a thrust disc and a first shaft sleeve are sequentially sleeved on one pull rod on the left in a coaxial manner from left to right, the thrust disc, the first shaft sleeve and the motor rotor are sequentially clamped together, and the thrust disc is axially locked and fixed through the nut; a nut, an impeller and a second shaft sleeve are sequentially sleeved on one pull rod on the right from right to left coaxially, the impeller, the second shaft sleeve and a motor rotor are sequentially clamped together, and the impeller is axially locked and fixed through the nut; thrust bearings are symmetrically arranged on two sides of the thrust disc, and radial bearings are sleeved on the first shaft sleeve and the second shaft sleeve respectively.
Preferably, each of the thrust bearing and the radial bearing is an air suspension bearing or a magnetic suspension bearing.
Preferably, the motor rotor comprises a magnetic steel sleeve, magnetic steel and a magnetic steel seal head; the magnetic steel sleeve and the magnetic steel are coaxially arranged, and the magnetic steel sleeve is sleeved on the magnetic steel and is inserted into the inner cavity of the motor stator; magnetic steel end sockets are coaxially and symmetrically sleeved inside the two ends of the magnetic steel sleeve, each magnetic steel end socket is of a vertically arranged T-shaped annular structure, the bottom of each magnetic steel end socket is matched with the inside of the magnetic steel sleeve, and the magnetic steel is axially positioned; the top of each magnetic steel seal head is also provided with a groove in a coaxial embedding manner, one end of each pull rod is respectively sleeved in the groove corresponding to the magnetic steel seal head, and the first shaft sleeve and the second shaft sleeve are respectively clamped on the bosses corresponding to the magnetic steel seal heads.
Preferably, a small hole for magnetizing the magnetic steel is further formed in the middle of each magnetic steel sealing head.
Preferably, the shell assembly comprises an air filter, a filter mounting base, a shell body, a right sealing plate, a left sealing plate and a bearing seat; a cylindrical inner cavity is horizontally formed in the shell body, the left end of the inner cavity of the shell body vertically extends out of the left end face of the shell body, and the motor stator and the inner cavity of the shell body are coaxially arranged and fixedly installed in the inner cavity of the shell body; a filter mounting base is attached to the left end face of the shell body by the outer wall of the shell body in parallel, the filter mounting base is of an annular structure and is coaxially arranged with the inner cavity of the shell body, the right end face of the filter mounting base is fixedly connected with the shell body in a threaded manner, and an air filter is fixedly sleeved in the left end of the filter mounting base; a bearing seat is arranged on the left end face of the shell body by abutting against the inner wall of the shell body in a parallel fit manner, the bearing seat is of an annular structure and is arranged inside the filter mounting base, the bearing seat and the inner cavity of the shell body are coaxially arranged, and the bearing seat and the inner cavity of the shell body are fixedly connected in a threaded manner; a left sealing plate is coaxially arranged on the end face of the left end of the bearing seat, the left sealing plate is in a straw hat-shaped structure, and the large end face of the left sealing plate is fixedly connected with the bearing seat in a threaded manner; still laminate side by side on the right-hand member terminal surface of casing body and be equipped with right shrouding, just right shrouding is the straw cap-shaped structure, right shrouding with the inner chamber coaxial center setting of casing body, and its big terminal surface with the casing body spiro union is fixed.
Preferably, a thrust bearing placing groove is further embedded between the large end face of the left sealing plate and the bearing seat, and the thrust bearing placing groove is coaxially arranged with the inner cavity of the housing body and is respectively communicated with the inside of the left sealing plate and the inner cavity of the housing body; the other end of the left pull rod horizontally extends into the left sealing plate, and the thrust disc and the thrust bearing are both positioned in the thrust bearing placing groove and freely rotate in the thrust bearing placing groove.
Preferably, an impeller placing groove matched with an impeller is further formed in the right end of the shell body in an embedded mode, the impeller placing groove and the inner cavity of the shell body are coaxially arranged, and the impeller placing groove is communicated with the inner cavity of the shell body and the inner portion of the right sealing plate respectively; the other end of the right pull rod horizontally extends into the right sealing plate, the impeller is located in the impeller placing groove, and the impeller is free to rotate in the impeller placing groove.
Preferably, an air flow channel is further embedded in the wall of the shell body along the circumferential direction of the wall, the air flow channel is of a circular ring-shaped structure and is coaxially arranged with the inner cavity of the shell body, the right end of the air flow channel is arranged at the same position as the right end of the inner cavity of the shell body, and the left end of the air flow channel vertically extends out of the left end face of the shell body and is communicated with the inside of the filter mounting base; a bearing cooling air hole is vertically formed in the end face of the small end of the left sealing plate in a penetrating mode, and the bearing cooling air hole and the left sealing plate are coaxially arranged and are respectively communicated with the inside of the filter mounting base and the inside of the left sealing plate; and a plurality of cooling air holes are uniformly distributed on the inner wall of the inner cavity of the shell body along the circumferential direction of the inner wall at intervals, and each cooling air hole extends outwards vertically and is communicated with the air flow channel.
Preferably, a plurality of second reinforcing ribs are uniformly distributed on the end face of the right end of the inner cavity of the shell body at intervals along the circumferential direction of the inner cavity, each second reinforcing rib is arranged in the impeller placing groove and does not interfere with the impeller, and the second reinforcing ribs support one radial bearing on the right side respectively; the radial bearing on the left is supported on the end face of the right end of the bearing seat, a plurality of first reinforcing ribs are uniformly distributed in the air flow channel along the circumferential direction of the air flow channel at intervals, and each first reinforcing rib is fixedly connected with the inner side wall and the outer side wall of the air flow channel respectively.
Preferably, an inner casing flow channel is further formed between the impeller placement groove and the right sealing plate in an embedded manner, the inner casing flow channel is arranged in the casing body, and the inner casing flow channel and the impeller placement groove are coaxially arranged and are respectively communicated with the inner parts of the impeller placement groove and the right sealing plate; and a shell outlet is also vertically formed in the outer wall of the right end of the shell body, extends vertically inwards and is communicated with the inner flow channel of the shell.
The invention has the beneficial effects that:
(1) the invention has scientific and reasonable structural design, and reduces the size and the weight of the whole machine through the integrated design of the shell;
(2) according to the invention, the air flow channel and the cooling air hole are arranged on the shell body, and the bearing cooling air hole is arranged on the left sealing plate, so that the internal part of the shell is cooled doubly, the cooling effect is obvious, and the damage of an internal rotor assembly caused by the cooling heat dissipation problem in the high-speed rotation process is avoided, thereby prolonging the service life of the centrifugal compressor;
(3) the invention does not need a lubricating oil system, has less energy consumption and outputs clean and oilless gas;
(4) the thrust bearing and the radial bearing are both air suspension or magnetic suspension bearings, and the shaft and the bearings rotate without contact, so that the noise is low, the efficiency is high, and the service life is long;
(5) when the motor rotor rotates, the impeller is driven to rotate by the second shaft sleeve, the generated axial force acts on the thrust bearing through the thrust disc, and a high-pressure air mold is generated between the thrust disc and the thrust bearing during working, so that collision between the impeller and the shell assembly is avoided, and the service life of the rotor assembly is prolonged;
(6) the invention adopts labyrinth-free sealing, thereby reducing the risk of leakage.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a centrifugal compressor for a hydrogen fuel cell according to the present invention.
Fig. 2 is a schematic structural view of the housing assembly of fig. 1.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a side view of fig. 2.
Fig. 5 is a schematic view of the structure of the rotor assembly of fig. 1.
Wherein, 1-an air filter sheet; 2-a filter mounting base; 3-a radial bearing; 4-a first reinforcing rib; 5-a motor stator; 6-a housing body; 7-a motor rotor; 8-air flow channel; 9-an impeller; 10-right closing plate; 11-a thrust disc; 12-bearing cooling air holes; 13-left closing plate; 14-a thrust bearing; 15-bearing seats; 16-cooling air holes; 17-a second reinforcing rib; 18-a flow passage in the casing; 19-the outlet of the housing; 20-impeller placing grooves; 21-thrust bearing placement grooves; 22-a first sleeve; 23-a magnetic steel sleeve; 24-magnetic steel; 25-magnetic steel end socket; 26-a second bushing; 27-an impeller; 28-a nut; 29-pull rod.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description.
The invention relates to a centrifugal compressor for a hydrogen fuel cell, which comprises a shell assembly, a motor stator 5, a thrust disc 11, a thrust bearing 14, a radial bearing 3, a first shaft sleeve 22, a pull rod 29, a second shaft sleeve 26, an impeller 27, a nut 28 and a motor rotor 7, wherein the motor stator is arranged on the shell assembly; as shown in fig. 1 and 5, a motor stator 5 is further horizontally and fixedly disposed inside the housing assembly, a motor rotor 7 is inserted into an inner cavity of the motor stator 5, two ends of the motor rotor 7 respectively extend out of the motor stator 5, and the two are connected in a free rotation manner.
The motor rotor 7 comprises a magnetic steel sleeve 23, magnetic steel 24 and a magnetic steel seal head 25; as shown in fig. 1 and 5, the magnetic steel sleeve 23 and the magnetic steel 24 are coaxially arranged, and the magnetic steel sleeve 23 is sleeved on the magnetic steel 24 and is inserted into the inner cavity of the motor stator 5; magnetic steel end sockets 25 are coaxially and symmetrically sleeved inside two ends of the magnetic steel sleeve 23, each magnetic steel end socket 25 is of a vertically arranged T-shaped annular structure, the bottom of each magnetic steel end socket is matched with the inside of the magnetic steel sleeve 23, and the magnetic steel 24 is axially positioned; wherein, a small hole for magnetizing the magnetic steel 24 is further formed in the middle of each magnetic steel end socket 25.
A groove is also formed in the top of each magnetic steel end socket 25 in a coaxial embedded mode, and one end of each pull rod 29 is sleeved in the groove of the corresponding magnetic steel end socket 25; as shown in fig. 1 and 5, a nut 28, a thrust disc 11 and a first shaft sleeve 22 are sequentially and coaxially sleeved on one left pull rod 29 from left to right, the thrust disc 11, the first shaft sleeve 22 and one left magnetic steel end socket 25 are sequentially clamped together, and the thrust disc 11 is axially locked and fixed through the nut 28; a nut 28, an impeller 27 and a second shaft sleeve 26 are sequentially sleeved on one pull rod 29 on the right from right to left coaxially, the impeller 27, the second shaft sleeve 26 and one magnetic steel seal head 25 on the right are sequentially clamped together, and the impeller 27 is axially locked and fixed through the nut 28; the first shaft sleeve 22 and the second shaft sleeve 26 are respectively clamped on the bosses corresponding to the magnetic steel seal heads 25.
As shown in fig. 1 and 5, thrust bearings 14 are symmetrically arranged on both sides of the thrust disc 11, and radial bearings 3 are respectively sleeved on the first shaft sleeve 22 and the second shaft sleeve 26; wherein each of the thrust bearing 14 and the radial bearing 3 is an air suspension or magnetic suspension bearing.
The shell assembly comprises an air filter 1, a filter mounting base 2, a shell body 6, a right sealing plate 10, a left sealing plate 13 and a bearing seat 15; as shown in fig. 1 to 4, a cylindrical inner cavity is horizontally formed in the housing body 6, the left end of the inner cavity of the housing body 6 vertically extends out of the left end face of the housing body 6, and the motor stator 5 is coaxially arranged with the inner cavity of the housing body 6 and fixedly installed in the inner cavity of the housing body 6; a filter mounting base 2 is arranged on the left end face of the shell body 6 by abutting against the outer wall of the shell body in a parallel attaching mode, the filter mounting base 2 is of a circular ring-shaped structure and is coaxially arranged with the inner cavity of the shell body 6, the right end face of the filter mounting base 2 is fixedly connected with the shell body 6 in a threaded mode, and an air filter 1 is fixedly sleeved inside the left end of the filter mounting base; wherein, inside phase-match of air filter 1 and cassette mounting base 2, and its periphery terminal surface all with the sealed fixed connection of the inner wall of cassette mounting base 2 to the inside of the air admission casing after being convenient for filter.
According to the invention, the air flow channel 8 is also embedded in the wall of the shell body 6 along the circumferential direction, as shown in fig. 1-4, the air flow channel 8 is of a circular ring structure and coaxially arranged with the inner cavity of the shell body 6, the right end of the air flow channel 8 is arranged at the same position as the right end of the inner cavity of the shell body 6, and the left end of the air flow channel vertically extends out of the left end face of the shell body 6 and is communicated with the inside of the filter mounting base 2.
The invention is also provided with a bearing seat 15 which is attached in parallel on the left end surface of the shell body 6 near the inner wall, and the bearing seat 15 is in a circular structure and is arranged inside the filter mounting base 2; as shown in fig. 1 to 4, the bearing seat 15 and the inner cavity of the housing body 6 are coaxially arranged and are screwed and fixed with each other; wherein, the right-hand member terminal surface at bearing frame 15 is run through perpendicularly and is seted up the journal bearing standing groove, and this journal bearing standing groove sets up with the axle center with bearing frame 15 to communicate with the inner chamber of casing body 6, and a journal bearing 3 on the left side is placed in the journal bearing standing groove, and supports on the right-hand member terminal surface of bearing frame 15.
The left end face of the bearing seat 15 is also coaxially provided with a left closing plate 13, the left closing plate 13 is in a straw hat-shaped structure, and the large end face of the left closing plate 13 is fixedly connected with the bearing seat 15 in a threaded manner; as shown in fig. 1 to 4, the left sealing plate 13 is disposed to be not interfered with the air filter 1, and a bearing cooling air hole 12 is further vertically formed through the small end surface thereof, the bearing cooling air hole 12 and the left sealing plate 13 are coaxially disposed, and are respectively communicated with the inside of the filter mounting base 2 and the inside of the left sealing plate 13, so as to cool the thrust bearing 14 and the radial bearing 3.
As shown in fig. 1 to 4, a thrust bearing accommodating groove 21 is further formed between the large end surface of the left sealing plate 13 and the bearing seat 15 in an embedded manner, and the thrust bearing accommodating groove 21 is coaxially arranged with the inner cavity of the housing body 6 and is respectively communicated with the inside of the left sealing plate 13 and the inner cavity of the housing body 6; the other end of the left pull rod 29 extends horizontally into the left closing plate 13, and the thrust disk 11 and the thrust bearing 14 are both located in the thrust bearing accommodating groove 21 and rotate freely in the thrust bearing accommodating groove 21.
As shown in fig. 1 to 4, a plurality of cooling air holes 16 are further vertically and uniformly distributed on the inner wall of the inner cavity of the housing body 6 along the circumferential direction thereof at intervals, and each cooling air hole 16 extends vertically and outwardly and is respectively communicated with the air flow passage 8 for cooling the motor stator and the motor rotor.
In the invention, a right sealing plate 10 is also attached to the right end face of the shell body 6 in parallel, and the right sealing plate 10 is in a straw hat-shaped structure; as shown in fig. 1 to 4, the right sealing plate 10 is coaxially disposed with the inner cavity of the housing body 6, and the large end surface thereof is screwed with the housing body 6.
As shown in fig. 1 to 4, an impeller placing groove 20 matched with the impeller 27 is further formed in the right end of the housing body 6 in an embedded manner, and the impeller placing groove 20 is coaxially arranged with the inner cavity of the housing body 6 and is respectively communicated with the inner cavity of the housing body 6 and the inside of the right sealing plate 10; the other end of the right tie bar 29 extends horizontally into the right sealing plate 10, and the impeller 27 is located in the impeller groove 20 and rotates freely in the impeller groove 20.
As shown in fig. 1 to 4, a plurality of second reinforcing ribs 17 are further uniformly distributed on the end surface of the right end of the inner cavity of the housing body 6 at vertical intervals along the circumferential direction thereof, and each second reinforcing rib 17 is disposed in the impeller accommodating groove 20, is not interfered with the impeller 27, and supports one radial bearing 3 on the right side.
As shown in fig. 1 to 4, a plurality of first reinforcing ribs 4 are uniformly distributed in the air flow channel 8 along the circumferential direction thereof at intervals, and each first reinforcing rib 4 is fixedly connected with the inner and outer side walls of the air flow channel 8.
In the invention, a casing inner flow channel 18 is also embedded between the impeller placing groove 20 and the right sealing plate 10, and the casing inner flow channel 18 is arranged in the casing body 6; the casing inner flow passage 18 and the impeller placement groove 20 are coaxially arranged and are respectively communicated with the impeller placement groove 20 and the inside of the right sealing plate 10; as shown in fig. 1 to 4, a casing outlet 19 is further vertically formed in the outer wall of the right end of the casing body 6, and the casing outlet 19 extends vertically inward and is communicated with the casing inner flow channel 18, so that air can flow through the casing inner flow channel 18 after acting through the impeller, and then enters the hydrogen fuel cell system through the casing outlet 19.
The working principle of the invention is as follows: after being filtered by the air filter sheet 1, a part of air enters the air flow channel 8 and then enters the interior of the shell body 6 through the cooling air hole 16 to cool the motor stator 5 and the motor rotor 6; the other part enters the bearing seat 15 through the bearing cooling air hole 12 to cool the thrust bearing 14 and the radial bearing 3, then enters the impeller placing groove 20, enters the casing inner flow passage 18 after the impeller 27 is worked, and finally enters the hydrogen fuel cell system through the casing outlet 19.
The invention has the beneficial effects that:
(1) the invention has scientific and reasonable structural design, and reduces the size and the weight of the whole machine through the integrated design of the shell;
(2) according to the invention, the air flow channel 8 and the cooling air hole 16 are arranged on the shell body 6, and the bearing cooling air hole 12 is arranged on the left sealing plate 13, so that double cooling of the interior of the shell is realized, the cooling effect is obvious, the damage caused by the cooling heat dissipation problem of the rotor assembly in the interior in the high-speed rotating process is avoided, and the service life of the centrifugal compressor is prolonged;
(3) the invention does not need a lubricating oil system, has less energy consumption and outputs clean and oilless gas;
(4) the thrust bearing 14 and the radial bearing 3 are both air suspension or magnetic suspension bearings, and the shaft and the bearings rotate without contact, so that the noise is low, the efficiency is high, and the service life is long;
(5) when the motor rotor 7 rotates, the second shaft sleeve 26 drives the impeller 27 to rotate, the generated axial force acts on the thrust bearing 14 through the thrust disc 11, and a high-pressure air mold is generated between the thrust disc 11 and the thrust bearing 14 during working, so that collision between the impeller 27 and a shell assembly is avoided, and the service life of the rotor assembly is prolonged;
(6) the invention adopts labyrinth-free sealing, thereby reducing the risk of leakage.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should fall into the protection scope of the present invention without departing from the design concept of the present invention, and the technical contents of the present invention as claimed are all described in the technical claims.

Claims (10)

1. A centrifugal compressor for a hydrogen fuel cell, characterized by: the device comprises a shell assembly, a motor stator, a thrust disc, a thrust bearing, a radial bearing, a first shaft sleeve, a pull rod, a second shaft sleeve, an impeller, a nut and a motor rotor; a motor stator is horizontally and fixedly arranged in the shell assembly, a motor rotor is inserted into an inner cavity of the motor stator, two ends of the motor rotor respectively vertically extend out of the motor stator, and the motor stator and the motor rotor are in free rotary connection; pull rods are respectively sleeved on the end faces of the left end and the right end of the motor rotor in a coaxial manner, a nut, a thrust disc and a first shaft sleeve are sequentially sleeved on one pull rod on the left in a coaxial manner from left to right, the thrust disc, the first shaft sleeve and the motor rotor are sequentially clamped together, and the thrust disc is axially locked and fixed through the nut; a nut, an impeller and a second shaft sleeve are sequentially sleeved on one pull rod on the right from right to left coaxially, the impeller, the second shaft sleeve and a motor rotor are sequentially clamped together, and the impeller is axially locked and fixed through the nut; thrust bearings are symmetrically arranged on two sides of the thrust disc, and radial bearings are sleeved on the first shaft sleeve and the second shaft sleeve respectively.
2. A centrifugal compressor for a hydrogen fuel cell according to claim 1, characterized in that: each thrust bearing and each radial bearing are air suspension or magnetic suspension bearings.
3. A centrifugal compressor for a hydrogen fuel cell according to claim 1, characterized in that: the motor rotor comprises a magnetic steel sleeve, magnetic steel and a magnetic steel seal head; the magnetic steel sleeve and the magnetic steel are coaxially arranged, and the magnetic steel sleeve is sleeved on the magnetic steel and is inserted into the inner cavity of the motor stator; magnetic steel end sockets are coaxially and symmetrically sleeved inside the two ends of the magnetic steel sleeve, each magnetic steel end socket is of a vertically arranged T-shaped annular structure, the bottom of each magnetic steel end socket is matched with the inside of the magnetic steel sleeve, and the magnetic steel is axially positioned; the top of each magnetic steel seal head is also provided with a groove in a coaxial embedding manner, one end of each pull rod is respectively sleeved in the groove corresponding to the magnetic steel seal head, and the first shaft sleeve and the second shaft sleeve are respectively clamped on the bosses corresponding to the magnetic steel seal heads.
4. A centrifugal compressor for a hydrogen fuel cell according to claim 3, characterized in that: and a small hole for magnetizing the magnetic steel is also formed in the middle of each magnetic steel end socket.
5. A centrifugal compressor for a hydrogen fuel cell according to claim 3, characterized in that: the shell assembly comprises an air filter, a filter mounting base, a shell body, a right sealing plate, a left sealing plate and a bearing seat; a cylindrical inner cavity is horizontally formed in the shell body, the left end of the inner cavity of the shell body vertically extends out of the left end face of the shell body, and the motor stator and the inner cavity of the shell body are coaxially arranged and fixedly installed in the inner cavity of the shell body; a filter mounting base is attached to the left end face of the shell body by the outer wall of the shell body in parallel, the filter mounting base is of an annular structure and is coaxially arranged with the inner cavity of the shell body, the right end face of the filter mounting base is fixedly connected with the shell body in a threaded manner, and an air filter is fixedly sleeved in the left end of the filter mounting base; a bearing seat is arranged on the left end face of the shell body by abutting against the inner wall of the shell body in a parallel fit manner, the bearing seat is of an annular structure and is arranged inside the filter mounting base, the bearing seat and the inner cavity of the shell body are coaxially arranged, and the bearing seat and the inner cavity of the shell body are fixedly connected in a threaded manner; a left sealing plate is coaxially arranged on the end face of the left end of the bearing seat, the left sealing plate is in a straw hat-shaped structure, and the large end face of the left sealing plate is fixedly connected with the bearing seat in a threaded manner; still laminate side by side on the right-hand member terminal surface of casing body and be equipped with right shrouding, just right shrouding is the straw cap-shaped structure, right shrouding with the inner chamber coaxial center setting of casing body, and its big terminal surface with the casing body spiro union is fixed.
6. A centrifugal compressor for a hydrogen fuel cell according to claim 5, characterized in that: a thrust bearing placing groove is further formed between the large end face of the left sealing plate and the bearing seat in an embedded mode, and the thrust bearing placing groove and the inner cavity of the shell body are coaxially arranged and are respectively communicated with the inside of the left sealing plate and the inner cavity of the shell body; the other end of the left pull rod horizontally extends into the left sealing plate, and the thrust disc and the thrust bearing are both positioned in the thrust bearing placing groove and freely rotate in the thrust bearing placing groove.
7. A centrifugal compressor for a hydrogen fuel cell according to claim 5, characterized in that: an impeller placing groove matched with an impeller is further formed in the right end of the shell body in an embedded mode, the impeller placing groove and the inner cavity of the shell body are coaxially arranged, and the impeller placing groove is communicated with the inner cavity of the shell body and the inner portion of the right sealing plate respectively; the other end of the right pull rod horizontally extends into the right sealing plate, the impeller is located in the impeller placing groove, and the impeller is free to rotate in the impeller placing groove.
8. A centrifugal compressor for a hydrogen fuel cell according to claim 5, characterized in that: an air flow channel is further embedded in the wall of the shell body along the circumferential direction of the wall, the air flow channel is of a circular ring-shaped structure and is coaxially arranged with the inner cavity of the shell body, the right end of the air flow channel is arranged at the same position as the right end of the inner cavity of the shell body, and the left end of the air flow channel vertically extends out of the left end face of the shell body and is communicated with the inside of the filter mounting base; a bearing cooling air hole is vertically formed in the end face of the small end of the left sealing plate in a penetrating mode, and the bearing cooling air hole and the left sealing plate are coaxially arranged and are respectively communicated with the inside of the filter mounting base and the inside of the left sealing plate; and a plurality of cooling air holes are uniformly distributed on the inner wall of the inner cavity of the shell body along the circumferential direction of the inner wall at intervals, and each cooling air hole extends outwards vertically and is communicated with the air flow channel.
9. A centrifugal compressor for a hydrogen fuel cell according to claim 8, characterized in that: a plurality of second reinforcing ribs are vertically and uniformly distributed on the end face of the right end of the inner cavity of the shell body at intervals along the circumferential direction of the inner cavity, each second reinforcing rib is arranged in the impeller placing groove and does not interfere with the impeller, and the second reinforcing ribs support the right radial bearing respectively; the radial bearing on the left is supported on the end face of the right end of the bearing seat, a plurality of first reinforcing ribs are uniformly distributed in the air flow channel along the circumferential direction of the air flow channel at intervals, and each first reinforcing rib is fixedly connected with the inner side wall and the outer side wall of the air flow channel respectively.
10. A centrifugal compressor for a hydrogen fuel cell according to claim 7, characterized in that: an inner casing flow channel is further arranged between the impeller placing groove and the right sealing plate in an embedded mode, the inner casing flow channel is arranged in the casing body, the inner casing flow channel and the impeller placing groove are coaxially arranged, and the inner casing flow channel and the inner part of the impeller placing groove are communicated with the inner part of the right sealing plate respectively; and a shell outlet is also vertically formed in the outer wall of the right end of the shell body, extends vertically inwards and is communicated with the inner flow channel of the shell.
CN202010296087.7A 2020-04-15 2020-04-15 Centrifugal compressor for hydrogen fuel cell Pending CN111503042A (en)

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Application Number Priority Date Filing Date Title
CN202010296087.7A CN111503042A (en) 2020-04-15 2020-04-15 Centrifugal compressor for hydrogen fuel cell

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111998005A (en) * 2020-08-25 2020-11-27 南京工程学院 Cooling and flushing structure of water lubrication thrust bearing
CN112879317A (en) * 2021-01-30 2021-06-01 海拓宾未来工业集团有限公司 High-speed high-pressure magnetic suspension centrifugal two-stage air compressor and control method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111998005A (en) * 2020-08-25 2020-11-27 南京工程学院 Cooling and flushing structure of water lubrication thrust bearing
CN111998005B (en) * 2020-08-25 2022-02-18 南京工程学院 Cooling and flushing structure of water lubrication thrust bearing
CN112879317A (en) * 2021-01-30 2021-06-01 海拓宾未来工业集团有限公司 High-speed high-pressure magnetic suspension centrifugal two-stage air compressor and control method thereof
CN112879317B (en) * 2021-01-30 2022-08-16 江苏海拓宾未来工业科技集团有限公司 High-speed high-pressure magnetic suspension centrifugal two-stage air compressor and control method thereof

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