CN113357170A - Fuel cell hydrogen circuit series integrated system - Google Patents
Fuel cell hydrogen circuit series integrated system Download PDFInfo
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- CN113357170A CN113357170A CN202110623912.4A CN202110623912A CN113357170A CN 113357170 A CN113357170 A CN 113357170A CN 202110623912 A CN202110623912 A CN 202110623912A CN 113357170 A CN113357170 A CN 113357170A
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Images
Classifications
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/064—Details of the rotor
-
- 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
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/0646—Details of the stator
-
- 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
- F04D29/002—Details, component parts, or accessories 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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials 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
- F04D29/05—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
- F04D29/06—Lubrication
- F04D29/063—Lubrication specially 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
- F04D29/08—Sealings
- F04D29/083—Sealings 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- 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
- F04D29/5853—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps heat insulation or conduction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
A fuel cell hydrogen circuit series connection integrated system comprises an integrated base, wherein a hydrogen circulating pump is installed on one side of the integrated base, a hydrogen pump air inlet channel and a hydrogen pump air outlet channel are arranged in the integrated base, one side of the hydrogen pump air inlet channel is communicated with a pressurization cavity of the hydrogen circulating pump, the other side of the hydrogen pump air inlet channel is communicated with a hydrogen circulating circuit inlet channel arranged in the integrated base, and a water separator and a drain valve are arranged in the hydrogen circulating circuit inlet channel; one side of the hydrogen pump exhaust passage is communicated with a pressurizing cavity of the hydrogen circulating pump, the other side of the hydrogen pump exhaust passage is communicated with a low-pressure area of an injector arranged on the integrated seat body, a high-pressure nozzle is arranged in the low-pressure area, the front side of the high-pressure nozzle is a hydrogen source inlet connecting pipe, an electromagnetic valve is arranged in the hydrogen source inlet connecting pipe, and the rear side of the high-pressure nozzle is an injector guide pipe. The installation effectiveness is high, and is small, and occupation space is little, and transmission distance is short, has eliminated transmission loss, has improved pressure boost efficiency, and stability is good, and the rigidity is strong, and the vibration is little, and the noise is low, has promoted the wholeness ability.
Description
The technical field is as follows:
the invention relates to a fuel cell hydrogen circuit series integrated system.
Background art:
proton exchange fuel cells are considered one of the most promising power sources for vehicles due to their high power density, zero pollution, low operating temperature, and rapid start-up capability. In order to improve the utilization rate of hydrogen and avoid faults such as anode gas shortage and flooding, hydrogen circulation is generally adopted in a fuel cell system, and a mode for realizing hydrogen circulation generally comprises a hydrogen circulating pump and a hydrogen ejector. In comparison: the hydrogen circulating pump has high cost, low localization degree, larger volume, low reliability and low system efficiency, is not beneficial to compaction, has moving parts and introduces parasitic power of the system; the hydrogen ejector can realize hydrogen ejection circulation by utilizing front-end high-pressure hydrogen, is used as a mechanical part, does not need to consume power, has high reliability and low cost, is easy to compact and integrate, and has outstanding advantages. However, the existing hydrogen ejector is difficult to play a role in a low-load area, the application of the hydrogen ejector in a fuel cell system is greatly limited due to the problem of narrow working range, and the matching degree of the existing ejector and the fuel cell is poor.
At present, each functional component of hydrogen circulation of a fuel cell system is separately used in a split mode, the integration degree is low, and the structure has the following defects in use: the installation needs on-site assembly, the pipeline connection is complex, a plurality of sets of pipelines are needed for connection, the operation is troublesome, and the installation efficiency is low; the volume is large, the occupied space is large, and the installation and the use are difficult in some areas with small space; the gas transmission distance is long, loss can be generated in the transmission process, and the pressurization efficiency is reduced; the structure stability is poor, the vibration is big, and the noise is big.
In addition, present hydrogen circulating pump mainly includes motor casing, bearing frame and the apron that is connected, forms the motor chamber between motor casing and the bearing frame, is equipped with the impeller between bearing frame and the apron, forms the pressure boost chamber, and the drive shaft of motor drives the high-speed rotatory completion of impeller and to gaseous pressure boost. The bearing seat has the main functions of supporting the bearing and isolating the motor cavity and the pressurizing cavity. Because the pressure of the hydrogen-containing mixed gas in the pressurizing cavity is very high, and the pressures in the motor cavity and the pressurizing cavity are unbalanced, the high-pressure hydrogen-containing mixed gas can leak to the motor cavity from the pressurizing cavity through the bearing in the bearing seat to impact the bearing, lubricating grease of the bearing can be blown away after a long time, the bearing is easy to wear and damage, the shutdown maintenance is caused, and the normal work is influenced. Although sealing rings are additionally arranged at two ends of a bearing to protect the bearing at present, the driving shaft of a motor rotates by tens of thousands of revolutions per minute, the sealing rings are easy to wear and lose efficacy, high-pressure hydrogen-containing mixed gas passes through the sealing rings and can also impact the bearing and enter a motor cavity, the bearing is damaged, the corrosion prevention effect of the stator and the rotor of the motor is poor, the hydrogen-containing mixed gas not only causes hydrogen embrittlement and hydrogen corrosion on the outer surfaces of the stator and the rotor, but also can permeate into the stator and the rotor to corrode an iron core and a magnet after a long time, the normal work of the stator and the rotor is influenced, and the service life of the motor is shortened; in addition, the mixed gas containing hydrogen generally has high humidity, and is condensed into water in the motor cavity, so that the water cannot be discharged, the risk of electric explosion is easily caused, and safety accidents are caused.
In summary, the above technical problems of the hydrogen path of the fuel cell have become a technical problem to be solved urgently in the industry.
The invention content is as follows:
in order to make up for the defects of the prior art, the invention provides a fuel cell hydrogen path series integrated system, which solves the problems of field assembly, complex pipeline connection, troublesome operation and low installation efficiency in the prior art, solves the problems of large volume and large occupied space of the prior split structure, solves the problems of long transmission distance, loss in the transmission process and reduced supercharging efficiency of the prior split structure, and solves the problems of poor stability, large vibration and large noise of the prior split structure.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a fuel cell hydrogen path series connection integrated system comprises an integrated base, wherein a hydrogen circulating pump is installed on one side of the integrated base, a hydrogen pump air inlet channel and a hydrogen pump air outlet channel are arranged in the integrated base, one side of the hydrogen pump air inlet channel is communicated with a pressurization cavity of the hydrogen circulating pump, the other side of the hydrogen pump air inlet channel is communicated with a hydrogen circulating path inlet channel arranged in the integrated base, a water separator and a drain valve are arranged in the hydrogen circulating path inlet channel, and the hydrogen circulating path inlet channel is connected with a hydrogen path outlet of a fuel cell stack; the hydrogen pump exhaust passage one side is linked together with the pressure boost chamber of hydrogen circulating pump, and the opposite side is linked together with the low-pressure region of installing the ejector on integrated pedestal, be equipped with high-pressure nozzle in the low-pressure region, the high-pressure nozzle front side is hydrogen source import takeover, is equipped with the solenoid valve in the hydrogen source import takeover, and hydrogen source import takeover connection hydrogen storage tank, high-pressure nozzle rear side are the ejector pipe, hydrogen circulating pump, drain valve, solenoid valve link to each other with fuel cell system controller respectively.
The hydrogen circulating pump comprises a bearing seat connected with the integrated seat body, the other side of the bearing seat is connected with the motor shell, a motor cavity is formed between the motor shell and the bearing seat, an encapsulating stator, an anticorrosive rotor and a motor shaft are arranged in the motor cavity, and the motor shaft is supported by bearings arranged on the motor shell and the bearing seat; a pressurizing cavity is formed between the bearing seat and the integrated seat body, the motor shaft penetrates through the bearing seat to extend into the pressurizing cavity and is provided with an impeller, a communication hole for communicating the motor cavity with the pressurizing cavity is formed in the bottom of the bearing seat, and the communication hole is used for keeping the pressure balance between the motor cavity and the pressurizing cavity and discharging water in the motor cavity to the pressurizing cavity; an annular flow passage is arranged in the integrated base body and is communicated with the hydrogen pump air inlet passage and the hydrogen pump exhaust passage.
The embedment stator includes stator core and stator coil, has the protective layer at stator core's both ends face and the outer cladding of stator coil, the space between stator coil and the motor casing is filled to the protective layer, and stator core's surface is equipped with anticorrosive insulating coating, and stator core's outside circumference surface contacts with the motor casing and dispels the heat.
The stator core comprises a plurality of stator laminations, and the outer surface of each stator lamination is plated or sprayed with an anticorrosive insulating coating before winding; the protective layer comprises a pouring sealant or a plastic layer, and the pouring sealant comprises a heat-conducting pouring sealant; the stator coil is mounted on the stator core through the coil framework.
The anti-corrosion rotor comprises a rotor core installed on a motor shaft, a magnet is fixedly arranged on the outer side of the rotor core, rotor flanges are fixedly arranged on the two end faces of the rotor core and the magnet respectively, protective sleeves are fixedly arranged on the outer sides of the two rotor flanges and the magnet, the rotor flanges are fixedly connected with the motor shaft in a sealing mode, and the rotor flanges are fixedly connected with the protective sleeves in a sealing mode.
The protective sleeve, the rotor flange and the motor shaft are made of stainless steel, the protective sleeve is fixedly installed on the outer sides of the two rotor flanges and the magnet, the rotor flanges are fixedly connected with the motor shaft through welded seals, and the rotor flanges are fixedly connected with the protective sleeve through welded seals.
One side of the bearing seat is provided with a groove cavity matched with the impeller in shape, sealing rings are respectively installed on the edges of two sides of the bearing seat, the surfaces of two sides of the bearing seat are subjected to oxidation treatment or corrosion prevention treatment, and the center of the bearing seat is fixedly installed on the bearing through a bearing retainer ring and a stepped shaft.
The impeller is made of plastic, a metal insert is fixedly arranged in the center of the impeller, and the metal insert is fixedly arranged on a motor shaft through a nut; the impeller is disc-shaped, and a plurality of blades are uniformly arranged on the impeller along the circumference.
The impeller adopts PEEK plastics, and the impeller links to each other with metal insert pouring integrated into one piece, is equipped with boss location structure between metal insert and the impeller, and the one end of metal insert is equipped with the terminal surface flange, and the metal insert adopts the stainless steel to make.
The bearing comprises an outer ring and an inner ring, a plurality of balls are arranged between the outer ring and the inner ring through a retainer, annular sealing elements positioned between the outer ring and the inner ring are respectively arranged on two sides of the balls, the outer edge of each annular sealing element is clamped in an annular clamping groove on the inner side surface of the outer ring, the inner edge of each annular sealing element is matched with the outer side surface of the inner ring for sealing, and a rolling path of each ball is filled with lubricating grease; the annular sealing element comprises an annular stainless steel piece, the outer side of the annular stainless steel piece is coated with high-temperature-resistant rubber, the outer side edge of the high-temperature-resistant rubber is clamped in an annular clamping groove in the inner side surface of the outer ring, the inner side edge of the high-temperature-resistant rubber is in contact fit with the outer side surface of the inner ring for sealing, the high-temperature-resistant rubber is made of fluororubber, and the balls are made of ceramic balls.
By adopting the scheme, the invention has the following advantages:
(1) each functional component of hydrogen circulation is prefabricated and assembled in factories, on-site assembly is not needed, operation is simple and convenient, and installation efficiency is high; the volume is small, the occupied space is small, and the installation and the use in some areas with small space are convenient; pressurized gas discharged from the hydrogen circulating pump directly enters the ejector, so that the transmission distance is short, the transmission loss is eliminated, and the pressurization efficiency is greatly improved; the whole structure has good stability, strong rigidity, small vibration in the working process and low noise, and the whole performance is improved.
(2) A water separator and a drain valve are arranged in the inlet channel of the hydrogen circulation path, the water separator can treat most of water in the hydrogen-containing mixed gas in advance and discharges the water through the drain valve, so that the situation that a hydrogen circulation pump and a fuel cell stack behind the water separator are flooded with water is avoided; when the hydrogen fuel cell works at high power, the ejector plays a main role, and the fuel cell system controller controls the hydrogen circulating pump to assist or stop working; when the hydrogen fuel cell works at low power, the working condition of the ejector cannot be covered, and the fuel cell system controller controls the hydrogen circulating pump to play a main role. The hydrogen fuel cell system has higher power, the invention has more obvious advantages, does not need a high-power and high-flow hydrogen circulating pump, only needs a small hydrogen circulating pump to match with ejectors with different specifications, can greatly reduce the energy consumption of the system, and can compatibly cover all working conditions.
(3) The rotor flange is used for protecting the two end faces of the rotor iron core and the magnet, the outer sides of the rotor flange and the magnet are protected through the protective sleeve, and all connecting gap positions are subjected to sealing treatment, so that hydrogen-containing mixed gas is prevented from causing hydrogen embrittlement and hydrogen corrosion to the outer surface of the rotor, the hydrogen-containing mixed gas is prevented from permeating into the rotor to corrode the magnet, and the normal rotation of the rotor is ensured.
(4) Carry out the cladding with stator coil through heat conduction pouring sealant, electroplate or the anticorrosive insulating coating of spraying before the wire winding stator core's stator punching, not only avoided hydrogenous mist to cause hydrogen embrittlement hydrogen to corrode to the outward appearance of stator, avoided hydrogenous mist to permeate to the stator inside to lead to the fact the corruption to stator core and stator coil in addition, stator core's outside circumference surface contacts with motor casing and does not influence the heat dissipation, heat conduction pouring sealant also can help the heat dissipation, has guaranteed the normal work of stator.
(5) The impeller made of the plastic material is corrosion-resistant, so that the impeller can not be corroded by hydrogen even if being contacted with the hydrogen-containing mixed gas for a long time, the service life of the impeller is prolonged, and the impeller made of the plastic material is light in weight, so that the power loss of a motor is avoided; the impeller of plastics material passes through metal insert and installs on the motor shaft, has guaranteed joint strength, and metal insert is unanimous with the motor shaft material, all is stainless steel, and the deformation volume is unanimous after being heated, has guaranteed the normal rotation of impeller.
(6) The communication hole which is used for communicating the motor cavity with the pressurizing cavity is formed in the bottom of the bearing seat, the communication hole is used for keeping pressure balance between the motor cavity and the pressurizing cavity, and high-pressure hydrogen-containing mixed gas in the pressurizing cavity can enter the motor cavity from the communication hole, so that the high-pressure hydrogen-containing mixed gas is prevented from leaking from the bearing of the bearing seat to the motor cavity, a protection effect on the bearing is achieved, the service life of the bearing is prolonged, the failure rate is reduced, and the normal work of a hydrogen circulating pump is ensured; meanwhile, water formed by condensation of the hydrogen-containing mixed gas in the motor cavity can also flow into the pressurizing cavity from the communicating hole, and the water is discharged from the exhaust port through the impeller rotating at high speed, so that the motor is protected.
(7) Install annular sealing member respectively between outer lane and the inner circle through bearing ball both sides, both can play the effect that blocks the protection to lubricating grease in the bearing, avoided causing the problem that the bearing wearing and tearing are easily bad because of lubricating grease is blown away by high-pressure hydrogenous mist, can play the guard action to bearing inside again, avoid hydrogenous mist infiltration to get into inside the bearing and lead to the fact the corruption to the ball, cause the corruption to lubricating grease simultaneously and cause lubricating grease to become invalid, the life of bearing has been prolonged, the fault rate is reduced, the normal work of hydrogen circulating pump has been guaranteed.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic sectional structure view of the hydrogen circulation pump of the present invention.
FIG. 3 is a schematic view of the rotor structure of the hydrogen circulation pump of the present invention.
Fig. 4 is a schematic structural view of an impeller of the hydrogen circulation pump of the present invention.
Fig. 5 is a schematic sectional structure view of an impeller of the hydrogen circulation pump of the present invention.
Fig. 6 is a schematic structural view of the principle of impeller pressurization of the hydrogen circulation pump of the present invention.
Fig. 7 is a schematic view of a bearing structure of the hydrogen circulation pump of the present invention.
In the figure, 1, an integrated base body, 2, a hydrogen circulating pump, 3, a hydrogen pump air inlet channel, 4, a hydrogen pump exhaust channel, 5, a hydrogen circulating path inlet channel, 6, a water separator, 7, a drain valve, 8, an ejector, 9, a low-pressure area, 10, a high-pressure nozzle, 11, a hydrogen source inlet connecting pipe, 12, an electromagnetic valve, 13, an ejector guide pipe, 14, a fuel cell system controller, 15, a bearing seat, 16, a motor shell, 17, a potting stator, 18, an anticorrosion rotor, 19, a motor shaft, 20, a bearing, 21, an impeller, 22, a communication hole, 23, an annular flow channel, 24, a stator core, 25, a stator coil, 26, a protective layer, 27, a coil framework, 28, a rotor core, 29, a magnet, 30, a rotor flange, 31, a protective sleeve, 32, a sealing ring, 33, a bearing retainer ring, 34, a metal insert, 35, a blade, 36 and a boss positioning structure, 37. the end face flange is 38, the outer ring is 39, the inner ring is 40, the retainer is 41, the balls are 42, the annular stainless steel part is 43, the high-temperature-resistant rubber is 44, and the annular clamping groove is formed.
The specific implementation mode is as follows:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1-7, a fuel cell hydrogen circuit series integrated system includes an integrated base 1, a hydrogen circulating pump 2 is installed on one side of the integrated base 1, a hydrogen pump inlet channel 3 and a hydrogen pump exhaust channel 4 are arranged in the integrated base 1, one side of the hydrogen pump inlet channel 3 is communicated with a pressurizing cavity of the hydrogen circulating pump 2, the other side is communicated with a hydrogen circulating circuit inlet channel 5 arranged in the integrated base 1, a water separator 6 and a drain valve 7 are arranged in the hydrogen circulating circuit inlet channel 5, and the hydrogen circulating circuit inlet channel 5 is connected with a hydrogen circuit outlet of a fuel cell stack; 4 one side of hydrogen pump exhaust passage is linked together with the pressure boost chamber of hydrogen circulating pump 2, and the opposite side is linked together with the low-pressure region 9 of installing the ejector 8 on integrated pedestal 1, be equipped with high pressure nozzle 10 in the low-pressure region 9, high pressure nozzle 10 front side is hydrogen source import takeover 11, is equipped with solenoid valve 12 in the hydrogen source import takeover 11, and solenoid valve 12 can adopt the form that solenoid valve or proportional valve or solenoid valve and proportional valve combine, and hydrogen storage tank is connected to hydrogen source import takeover 11, and high pressure nozzle 10 rear side is ejector pipe 13, is the high-pressure region in the ejector pipe 13, and the high-pressure region is including inhaling section, mixing section and diffusion section, hydrogen circulating pump 2, drain valve 7, solenoid valve 12 link to each other with fuel cell system controller 14 respectively.
When the hydrogen-containing mixed gas is in work, the hydrogen-containing mixed gas discharged by the fuel cell stack firstly enters the inlet channel 5 of the hydrogen circulation path, the water separator 6 can treat most of water in the hydrogen-containing mixed gas in advance, and the fuel cell system controller 14 controls the drain valve 7 to be opened at regular time to discharge the water, so that the situation that the hydrogen circulation pump 2 and the fuel cell stack behind are flooded with water is avoided; the hydrogen-containing mixed gas enters a pressurizing cavity of the hydrogen circulating pump 2 through the hydrogen pump air inlet channel 3, after the hydrogen-containing mixed gas is pressurized in the pressurizing cavity, the hydrogen-containing mixed gas is discharged from the hydrogen pump exhaust channel 4 and directly enters the low-pressure area 9 in the ejector 8, and then is discharged backwards through the high-pressure area in the ejector guide pipe 13, so that the combined pressurization of the hydrogen circulating pump 2 and the ejector 8 is realized, and in the process, the hydrogen in the hydrogen storage tank enters the ejector 8 through the hydrogen source inlet connecting pipe 11 and the electromagnetic valve 12 under the negative pressure effect so as to supplement the content of the hydrogen in the hydrogen-containing mixed gas. The hydrogen circulating pump 2, the ejector 8, the water separator 6, the drain valve 7, the electromagnetic valve 12 and the like are integrated into a whole, field assembly is not needed, the installation is simple and convenient, the installation efficiency is high, the volume is small, the occupied space is small, the hydrogen circulating pump is directly connected with the ejector, pressurized gas discharged from the hydrogen circulating pump 2 directly enters the ejector 8, the transmission distance is short, the transmission loss is eliminated, and the pressurization efficiency is greatly improved; the whole structure has good stability, strong rigidity, small vibration in the working process and low noise, and the whole performance is improved. When the hydrogen fuel cell works at high power, the ejector 8 plays a main role, and the fuel cell system controller controls the hydrogen circulating pump 2 to assist or stop working; when the hydrogen fuel cell works at low power, the working condition of the ejector 8 cannot be covered, and the fuel cell system controller controls the hydrogen circulating pump 2 to play a main role. The hydrogen fuel cell system has higher power, the invention has more obvious advantages, does not need a high-power and large-flow hydrogen circulating pump 2, only needs a small hydrogen circulating pump 2 to match with ejectors 8 with different specifications, can greatly reduce the energy consumption of the system, and can compatibly cover all working conditions.
The hydrogen circulating pump 2 comprises a bearing seat 15 connected with the integrated seat body 1, the other side of the bearing seat 15 is connected with a motor shell 16, a motor cavity is formed between the motor shell 16 and the bearing seat 15, an embedded stator 17, an anticorrosive rotor 18 and a motor shaft 19 are arranged in the motor cavity, and the motor shaft 19 is supported by bearings 20 arranged on the motor shell 16 and the bearing seat 15; a pressurizing cavity is formed between the bearing seat 15 and the integrated seat body 1, the motor shaft 19 penetrates through the bearing seat 15 to extend into the pressurizing cavity and is provided with an impeller 21, a communication hole 22 for communicating the motor cavity with the pressurizing cavity is formed in the bottom of the bearing seat 15, and the communication hole 22 is used for keeping the pressure balance between the motor cavity and the pressurizing cavity and discharging water in the motor cavity to the pressurizing cavity; an annular flow passage 23 is arranged in the integrated base body 1, and the annular flow passage 23 is communicated with the hydrogen pump air inlet passage 3 and the hydrogen pump exhaust passage 4. When the device works, the motor shaft 19 rotates at a high speed to drive the impeller 21 to rotate at a high speed, after gas enters from the hydrogen pump gas inlet channel 3, the annular flow channel 23 is matched with the impeller 21 to pressurize the gas, and finally, high-pressure gas is discharged from the hydrogen pump gas outlet channel 4. In the process, the high-pressure hydrogen-containing mixed gas in the pressurizing cavity enters the motor cavity from the communication hole 22, the high-pressure hydrogen-containing mixed gas is prevented from leaking to the motor cavity from the bearing 20 of the bearing seat 15, the bearing 20 is protected, meanwhile, water formed by condensation of the hydrogen-containing mixed gas in the motor cavity can also flow into the pressurizing cavity from the communication hole 22, and the water is discharged from the hydrogen pump exhaust passage 4 through the impeller 21 rotating at high speed.
The potting stator 17 comprises a stator core 24 and a stator coil 25, protective layers 26 are coated on two end faces of the stator core 24 and the outside of the stator coil 25, the protective layers 26 fill the space between the stator coil 25 and the motor shell 16, the protective layers 26 have certain thickness due to the design, the sealing performance and the corrosion resistance are enhanced, an anti-corrosion insulating coating is arranged on the outer surface of the stator core 24, and the outer circumferential surface of the stator core 24 is in contact with the motor shell 16 for heat dissipation.
The stator core 24 comprises a plurality of stator laminations, and the outer surface of each stator lamination is plated or sprayed with an anticorrosive insulating coating before winding; the protective layer 26 comprises a pouring sealant or a plastic layer, and the pouring sealant comprises a heat-conducting pouring sealant; the heat-conducting pouring sealant is used for bonding, sealing, encapsulating and coating protection of electronic components, belongs to a liquid state before being cured, has fluidity, has different glue viscosity according to different materials, performances and production processes of products, can realize the use value after being completely cured, and can play the roles of water resistance, moisture resistance, dust prevention, insulation, heat conduction, confidentiality, corrosion resistance, temperature resistance and shock resistance after being cured. The heat conduction pouring sealant can also transmit the heat of the stator coil to the motor shell to help heat dissipation, and during pouring, the stator core 24 is firstly pressed into the motor shell 16, and then the whole pouring sealant is poured. The stator coil 25 is mounted on the stator core 24 through a coil frame 27, the coil frame 27 comprises a PBT plastic frame or a phenolic resin frame, and the PBT plastic is also called poly (tetramethylene terephthalate), and has the characteristics of high strength, fatigue resistance, heat aging resistance, solvent resistance and good water stability. The stator coil 25 is formed by winding a corona-resistant enameled round copper wire, and the corona-resistant composite material is prepared by adding a certain amount of inorganic nano-materials with excellent corona resistance, such as Al2O3 and TiO, into a traditional insulating polymer2Mica or layered silicate, and the like, and the corona-resistant material is adopted as the enameled wire insulation of the variable frequency motor, so that the service life of the variable frequency motor can be prolonged.
The protective sleeve 31, the rotor flange 30 and the motor shaft 19 are all made of stainless steel, so that hydrogen corrosion and water corrosion can be prevented, and hydrogen embrittlement can be prevented. Protective sheath 31 fixed mounting links firmly through welded seal in the outside of two rotor flanges 30 and magnet 29, link firmly through welded seal between rotor flange 30 and the motor shaft 19, link firmly through welded seal between rotor flange 30 and the protective sheath 31, can effectively avoid inside the infiltration of hydrogenous mist to the rotor, reinforcing anticorrosive effect.
One side of bearing frame 15 is equipped with the slot cavity with impeller 21 shape matched with, and the sealing washer 32 is installed respectively at the both sides border of bearing frame 15 for seal respectively between bearing frame 15 and the motor casing 16, between bearing frame 15 and the integrated pedestal 1, prevent that inside gas from outwards leaking, the both sides surface of bearing frame 15 carries out oxidation treatment or anticorrosive treatment, bearing ring 33 and step shaft are installed fixedly to the center department of bearing frame 15.
The impeller 21 is made of plastic, a metal insert 34 is fixedly installed in the center of the impeller 21, and the metal insert 34 is fixedly installed on the motor shaft 19 through a nut; the impeller 21 is disc-shaped, and a plurality of blades 35 are uniformly arranged on the impeller 21 along the circumference. When the impeller 21 rotates at a high speed, gas in the grooves between the adjacent blades 35 is centrifugally thrown to the flow channel to form primary pressurization; the gas in the front groove is thrown out to form low pressure, and the gas in the flow channel enters the front groove again to be pressurized again; and finally discharging high-pressure gas by the aid of the multiple vortex motions of the groove, the flow channel, the groove and the flow channel.
The impeller 21 is made of PEEK plastic, which is also called polyether-ether-ketone and has the mechanical properties of resistance to normal and high temperature of 260 ℃, excellent mechanical properties, good self-lubricating property, resistance to chemical corrosion, flame retardance, peeling resistance, wear resistance, intolerance to strong nitric acid, concentrated sulfuric acid, radiation resistance and super strength. Impeller 21 and metal insert 34 are poured integrated into one piece and are linked to each other, are equipped with boss location structure 36 between metal insert 34 and the impeller 21, can prevent that metal insert 34 and impeller 21 from slipping each other, increase joint strength, and the one end of metal insert 34 is equipped with end flange 37, and end flange 37 directly contacts with the nut on motor shaft 19, and the nut application of force of being convenient for can be more firm with the installation of metal insert 34 and impeller 21 on motor shaft 19. The metal insert 34 is made of stainless steel, the motor shaft 19 is also made of stainless steel, the materials of the metal insert and the motor shaft are consistent, and the deformation amount after heating is consistent.
The bearing 20 comprises an outer ring 38 and an inner ring 39, a plurality of balls 41 are arranged between the outer ring 38 and the inner ring 39 through a retainer 40, annular sealing elements positioned between the outer ring 38 and the inner ring 39 are respectively arranged on two sides of each ball 41, the outer edge of each annular sealing element is clamped in an annular clamping groove 44 on the inner side surface of the outer ring 38, the inner edge of each annular sealing element is matched with the outer side surface of the inner ring for sealing, and a raceway of each ball 41 is filled with lubricating grease; the annular sealing element comprises an annular stainless steel piece 42, the outer side of the annular stainless steel piece 42 is coated with high-temperature-resistant rubber 43, the outer side edge of the high-temperature-resistant rubber 43 is clamped in an annular clamping groove 44 in the inner side surface of the outer ring 38, the inner side edge of the high-temperature-resistant rubber 43 is in contact fit with the outer side surface of the inner ring 39 for sealing, the outer side of the annular stainless steel piece 42 is coated with the high-temperature-resistant rubber 43, the outer side of the high-temperature-resistant rubber 43 is clamped in the annular clamping groove 44, and the inner side of the high-temperature-resistant rubber 43 is in contact fit with the outer side surface of the inner ring 39, so that the lubricating grease in the bearing can be prevented from being blocked and protected, the lubricating grease can be prevented from being blown away, the hydrogen-containing mixed gas can be prevented from permeating into the bearing to corrode the ball 41, and the high-temperature-resistant rubber 43 is made of a flexible material and cannot influence the normal rotation of the inner ring. The high temperature resistant rubber 43 includes fluororubber or hydrogenated nitrile rubber, and the fluororubber has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance. The hydrogenated butadiene-acrylonitrile rubber has good heat resistance and chemical corrosion resistance. The ball 41 is made of ceramic balls, the ceramic balls are corrosion-resistant, the thermal expansion coefficient of the ceramic balls is small, and the expansion of the bearing balls due to temperature cannot be caused in a high-temperature environment, so that the service temperature of the whole bearing is greatly improved, the temperature of a common bearing is about 160 ℃, and the temperature of the ceramic balls can reach more than 220 ℃. The ceramic ball has oil-free self-lubricating property and small friction coefficient, so the ceramic ball bearing has very high rotating speed, and the rotating speed of the bearing adopting the ceramic ball is 1.5 times that of a common bearing according to statistics.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (10)
1. A fuel cell hydrogen circuit series integrated system, characterized by: the hydrogen circulation device comprises an integrated seat body, wherein a hydrogen circulating pump is installed on one side of the integrated seat body, a hydrogen pump air inlet channel and a hydrogen pump air outlet channel are arranged in the integrated seat body, one side of the hydrogen pump air inlet channel is communicated with a pressurization cavity of the hydrogen circulating pump, the other side of the hydrogen pump air inlet channel is communicated with a hydrogen circulation path inlet channel arranged in the integrated seat body, a water separator and a drain valve are arranged in the hydrogen circulation path inlet channel, and the hydrogen circulation path inlet channel is connected with a hydrogen path outlet of a fuel cell stack; the hydrogen pump exhaust passage one side is linked together with the pressure boost chamber of hydrogen circulating pump, and the opposite side is linked together with the low-pressure region of installing the ejector on integrated pedestal, be equipped with high-pressure nozzle in the low-pressure region, the high-pressure nozzle front side is hydrogen source import takeover, is equipped with the solenoid valve in the hydrogen source import takeover, and hydrogen source import takeover connection hydrogen storage tank, high-pressure nozzle rear side are the ejector pipe, hydrogen circulating pump, drain valve, solenoid valve link to each other with fuel cell system controller respectively.
2. A fuel cell hydrogen circuit series integrated system according to claim 1, wherein: the hydrogen circulating pump comprises a bearing seat connected with the integrated seat body, the other side of the bearing seat is connected with the motor shell, a motor cavity is formed between the motor shell and the bearing seat, an encapsulating stator, an anticorrosive rotor and a motor shaft are arranged in the motor cavity, and the motor shaft is supported by bearings arranged on the motor shell and the bearing seat; a pressurizing cavity is formed between the bearing seat and the integrated seat body, the motor shaft penetrates through the bearing seat to extend into the pressurizing cavity and is provided with an impeller, a communication hole for communicating the motor cavity with the pressurizing cavity is formed in the bottom of the bearing seat, and the communication hole is used for keeping the pressure balance between the motor cavity and the pressurizing cavity and discharging water in the motor cavity to the pressurizing cavity; an annular flow passage is arranged in the integrated base body and is communicated with the hydrogen pump air inlet passage and the hydrogen pump exhaust passage.
3. The corrosion-resistant vortex-type hydrogen circulation pump according to claim 2, characterized in that: the embedment stator includes stator core and stator coil, has the protective layer at stator core's both ends face and the outer cladding of stator coil, the space between stator coil and the motor casing is filled to the protective layer, and stator core's surface is equipped with anticorrosive insulating coating, and stator core's outside circumference surface contacts with the motor casing and dispels the heat.
4. A corrosion-resistant vortex type hydrogen circulation pump according to claim 3, characterized in that: the stator core comprises a plurality of stator laminations, and the outer surface of each stator lamination is plated or sprayed with an anticorrosive insulating coating before winding; the protective layer comprises a pouring sealant or a plastic layer, and the pouring sealant comprises a heat-conducting pouring sealant; the stator coil is mounted on the stator core through the coil framework.
5. The corrosion-resistant vortex-type hydrogen circulation pump according to claim 2, characterized in that: the anti-corrosion rotor comprises a rotor core installed on a motor shaft, a magnet is fixedly arranged on the outer side of the rotor core, rotor flanges are fixedly arranged on the two end faces of the rotor core and the magnet respectively, protective sleeves are fixedly arranged on the outer sides of the two rotor flanges and the magnet, the rotor flanges are fixedly connected with the motor shaft in a sealing mode, and the rotor flanges are fixedly connected with the protective sleeves in a sealing mode.
6. The corrosion-resistant vortex-type hydrogen circulation pump according to claim 5, characterized in that: the protective sleeve, the rotor flange and the motor shaft are made of stainless steel, the protective sleeve is fixedly installed on the outer sides of the two rotor flanges and the magnet, the rotor flanges are fixedly connected with the motor shaft through welded seals, and the rotor flanges are fixedly connected with the protective sleeve through welded seals.
7. The corrosion-resistant vortex-type hydrogen circulation pump according to claim 2, characterized in that: one side of the bearing seat is provided with a groove cavity matched with the impeller in shape, sealing rings are respectively installed on the edges of two sides of the bearing seat, the surfaces of two sides of the bearing seat are subjected to oxidation treatment or corrosion prevention treatment, and the center of the bearing seat is fixedly installed on the bearing through a bearing retainer ring and a stepped shaft.
8. The corrosion-resistant vortex-type hydrogen circulation pump according to claim 2, characterized in that: the impeller is made of plastic, a metal insert is fixedly arranged in the center of the impeller, and the metal insert is fixedly arranged on a motor shaft through a nut; the impeller is disc-shaped, and a plurality of blades are uniformly arranged on the impeller along the circumference.
9. The corrosion-resistant vortex-type hydrogen circulation pump according to claim 8, characterized in that: the impeller adopts PEEK plastics, and the impeller links to each other with metal insert pouring integrated into one piece, is equipped with boss location structure between metal insert and the impeller, and the one end of metal insert is equipped with the terminal surface flange, and the metal insert adopts the stainless steel to make.
10. The corrosion-resistant vortex-type hydrogen circulation pump according to claim 2, characterized in that: the bearing comprises an outer ring and an inner ring, a plurality of balls are arranged between the outer ring and the inner ring through a retainer, annular sealing elements positioned between the outer ring and the inner ring are respectively arranged on two sides of the balls, the outer edge of each annular sealing element is clamped in an annular clamping groove on the inner side surface of the outer ring, the inner edge of each annular sealing element is matched with the outer side surface of the inner ring for sealing, and a rolling path of each ball is filled with lubricating grease; the annular sealing element comprises an annular stainless steel piece, the outer side of the annular stainless steel piece is coated with high-temperature-resistant rubber, the outer side edge of the high-temperature-resistant rubber is clamped in an annular clamping groove in the inner side surface of the outer ring, the inner side edge of the high-temperature-resistant rubber is in contact fit with the outer side surface of the inner ring for sealing, the high-temperature-resistant rubber is made of fluororubber, and the balls are made of ceramic balls.
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| CN202110623912.4A CN113357170A (en) | 2021-06-04 | 2021-06-04 | Fuel cell hydrogen circuit series integrated system |
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| CN202110623912.4A CN113357170A (en) | 2021-06-04 | 2021-06-04 | Fuel cell hydrogen circuit series integrated system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115425256B (en) * | 2022-09-07 | 2023-07-07 | 烟台东德实业有限公司 | Integrated bypass injection type Roots hydrogen circulating pump |
| WO2023160892A1 (en) * | 2022-02-25 | 2023-08-31 | Robert Bosch Gmbh | Rotor for an axial-field electric motor and production method for a rotor of an axial-field electric motor |
| WO2023160893A1 (en) * | 2022-02-25 | 2023-08-31 | Robert Bosch Gmbh | Magnetic rotor device for a fan for a fuel cell device, fan device, and method for producing a magnetic rotor device for a fan for a fuel cell device |
| WO2024002669A1 (en) * | 2022-06-29 | 2024-01-04 | Robert Bosch Gmbh | Side channel compressor for a fuel cell system for conveying and/or compressing a gaseous medium, and fuel cell system |
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Application publication date: 20210907 |
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| RJ01 | Rejection of invention patent application after publication |