CN112901566A - Fuel cell ejector with adjustable working nozzle - Google Patents
Fuel cell ejector with adjustable working nozzle Download PDFInfo
- Publication number
- CN112901566A CN112901566A CN202110336962.4A CN202110336962A CN112901566A CN 112901566 A CN112901566 A CN 112901566A CN 202110336962 A CN202110336962 A CN 202110336962A CN 112901566 A CN112901566 A CN 112901566A
- Authority
- CN
- China
- Prior art keywords
- ejector
- working nozzle
- sealing
- main body
- nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- 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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- 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
- F04F5/36—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 characterised by using specific inducing fluid
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- 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
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- 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
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
- F04F5/461—Adjustable nozzles
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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
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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
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- 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
The invention discloses a fuel cell ejector with an adjustable working nozzle, which comprises an ejector main body, the working nozzle, a sealing ring and a sealing locking pressing cap. The main body of the ejector consists of a receiving chamber, a mixing chamber and a diffusion chamber, and an inner thread, a thread, an annular sealing groove and a built-in sealing ring are arranged at the inlet of a working fluid. The middle part of the ejector main body, which is connected with the working nozzle, is provided with a sealing and locking pressure cap, and the sealing ring is tightly pressed through screwing to prevent hydrogen leakage. The outer portion of the body of the working nozzle is provided with an external thread which can be used for screwing, the working nozzle can horizontally move back and forth along the axis direction of the ejector main body through screwing with the internal thread of the ejector main body, and then the distance between the nozzle outlet and the ejector throat is changed to enable the nozzle outlet and the ejector throat to reach an optimal distance value, so that the ejection ratio is increased, the ejection amount of the ejector to the ejection fluid is increased, and the ejection performance of the ejector is improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell ejector with an adjustable working nozzle.
Background
The structure of the gas ejector is divided into four parts, including a working nozzle, a receiving chamber, a mixing chamber and a diffusion chamber; the working principle is that high-pressure working fluid is sprayed out from the working nozzle at high speed, so that a low-pressure area appears at the periphery of the outlet of the working nozzle, lower-pressure injection fluid is sucked into the mixing chamber in a curling manner, the injection fluid can obtain the energy of the high-pressure working fluid, the working pressure of the high-pressure injection fluid is further improved, and the high-pressure injection fluid is discharged from the diffusion chamber.
The ejector has a simple structure and no moving parts, is widely applied to industrial environments and scenes such as industrial thermal processing, refrigerators, electric power water storage devices, combustors, aviation ships and the like, and is very suitable for a hydrogen circulation recovery system of a fuel cell in a working mode.
The ejection performance of an ejector is usually very much dependent on the parameters of its structure. The shape and outlet diameter of the working nozzle; working fluid pressure, ejector fluid pressure; the diameter, length of the mixing chamber; the diameter and length of the diffusion chamber and the distance from the outlet of the working nozzle in the receiving chamber to the throat of the ejector directly influence the working performance of the ejector, once the structure of the ejector is determined, the working performance of the ejector is basically in a stable and solidified state under a common condition, and the ejector cannot adapt to the changed working state of a fuel cell due to the fact that the ejector cannot be effectively adjusted when being applied to a fuel cell system, and further influences the normal work of a hydrogen recovery system.
The invention content is as follows:
in order to avoid the situations in a fuel cell system and overcome the defect of the ejector working performance formed after the structural design and solidification of the ejector main body, the invention provides the fuel cell ejector with the adjustable working nozzle.
The fuel cell ejector is simple and reasonable in design structure and convenient to operate and control, the distance between the nozzle outlet and the ejector throat can be adjusted flexibly according to the working condition change of the fuel cell, and the purpose of improving the ejection capacity of the fuel cell ejector is achieved.
The invention is realized by the following technical scheme:
the invention provides a fuel cell ejector with an adjustable working nozzle. The main body of the ejector consists of a receiving chamber, a mixing chamber and a diffusion chamber, and an inner thread, a thread, an annular sealing groove and a built-in sealing ring are arranged at the inlet of a working fluid. The middle part of the ejector main body, which is connected with the working nozzle, is provided with a sealing and locking pressure cap, and the sealing ring is tightly pressed through screwing to prevent hydrogen leakage.
The outer portion of the body of the working nozzle is provided with an external thread which can be used for screwing, the working nozzle can horizontally move back and forth along the axis direction of the ejector main body through screwing with the internal thread of the ejector main body, and then the distance between the nozzle outlet and the ejector throat portion is changed to enable the working nozzle to reach an optimal distance value.
Preferably, the external thread provided on the outer middle section of the working nozzle for the rotation adjustment movement is a fine (but not limited to) straight thread.
Preferably, the working nozzle is in the form of a beam.
Further, the rear end of the working nozzle is provided with an internal thread with a sealing effect for connecting a pipeline. Preferably, the internal thread is a tapered sealing thread, preferably an NPT internal thread.
Preferably, the rear end of the working nozzle is externally shaped (but not limited to) square or hexagonal, and preferably, it is hexagonal.
Preferably, the internal thread arranged at the working fluid inlet of the ejector main body and matched with the working nozzle body in a screwing mode is a right-handed fine thread (but not limited to a straight thread).
Further, the working fluid inlet of the ejector main body is further provided with an annular sealing groove, and a sealing ring is installed in the sealing groove, so that sealing between the working nozzle and the ejector main body can be realized.
Preferably, the sealing ring is a sealing material resistant to hydrogen corrosion, and preferably, the annular sealing ring is made of hydrogenated nitrile butadiene rubber HNBR.
Furthermore, the working fluid inlet of the ejector main body is also provided with an external thread matched and screwed with the sealing locking pressing cap. Preferably, the external thread is a right-handed fine (but not limited to) straight thread.
Furthermore, the inside of the sealing locking pressure cap is provided with an internal thread which is matched and screwed with the inlet of the working fluid of the ejector main body. Preferably, the internal thread is a right-handed fine (but not limited to) straight thread.
Preferably, the part of the inside of the sealing and locking pressure cap connected with the ejector main body is also provided with an annular boss for compressing the annular sealing ring, and preferably, the sealing structure of the annular boss and the sealing ring is an end face sealing structure.
Optionally, in combination with the requirement of automatic control, the working nozzle may be connected to the stepping motor by a coupling to realize electric automatic screwing, so as to realize optimal injection performance and effect by system control.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a fuel cell ejector with an adjustable working nozzle. The main body of the ejector consists of a receiving chamber, a mixing chamber and a diffusion chamber. The outside of working nozzle is provided with external screw thread (straight thread) that can be used for closing with the ejector main part soon, cooperate with the internal thread (straight thread) of the inside setting of ejector, through closing soon, can realize that the working nozzle can follow the horizontal back-and-forth movement of axis direction of ejector main part, and then change the distance between nozzle outlet and the ejector throat, make it can be dynamic reach an optimum distance value, thereby promote the ejector to the ejector capacity of low pressure gas, increase injection ratio, improve the working property of ejector, realize optimal operating condition with guaranteeing the fuel cell ejector.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
FIG. 1 is a schematic diagram (in cross-section) of a fuel cell injector configuration with an adjustable working nozzle according to a preferred embodiment of the present invention;
FIG. 2 is a top plan view and a right side view (in cross-section) of a seal locking gland provided in accordance with a preferred embodiment of the present invention;
fig. 3 is a schematic structural view (cross-sectional view) of a body of the ejector according to the preferred embodiment of the present invention;
description of reference numerals: 1-a working nozzle; 2-sealing ring; 3-sealing and locking the pressing cap; 301-sealing the annular boss; 302-screwing the internal thread; 4-ejector body; 401-screwing external threads; 402-screwing the internal thread; 403-a receiving chamber; 404-throat; 405-a mixing chamber; 406-a diffusion chamber;
description of the symbols: a-distance of the working nozzle to the throat.
Detailed Description
The fuel cell ejector with adjustable working nozzle according to the present invention will be described in detail with reference to fig. 2 to 3, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and color the fuel cell ejector without changing the spirit and content of the present invention. The described embodiments are illustrative of the invention and are not to be construed as limiting.
Referring to fig. 1 to 3, the invention provides a fuel cell ejector with an adjustable working nozzle, which comprises a working nozzle 1, a sealing ring 2, a sealing locking pressure cap 3 and an ejector main body 4. An annular sealing boss 301 and a screwing internal thread 302 are machined in the sealing locking pressing cap 3; the eductor body 4 is comprised of a receiving chamber 403, a mixing chamber 405, and a diffusion chamber 406. The ejector main body 4 is provided with a screwing external thread 401 in external processing and a screwing internal thread 402 in internal processing.
The outer middle section of the working nozzle 1 is provided with an external thread which can be rotationally adjusted and moved and is matched with the screwing internal thread 402 of the ejector main body 4 to be screwed.
The rear end of the working nozzle 1 is provided with an internal thread with a sealing effect for connecting a high-pressure gas (hydrogen) pipeline, and the internal thread is connected with an external high-pressure hydrogen.
The rear end of the working nozzle 1 is shaped (but not limited) as a square or a hexagon, preferably, the outer shape is a hexagon, so that a wrench can be used for fastening.
The working fluid inlet of the ejector main body 4 is provided with a screwing internal thread 402 which can be matched with an external thread outside the working nozzle 1 body to be screwed, and the working nozzle 1 can horizontally move back and forth along the central axis direction of the ejector main body 4 through screwing forward and backward of the screwing internal thread and the external thread. Therefore, the distance A between the working nozzle 1 and the throat 404 of the ejector main body 4 is adjusted in real time to reach an optimal value, so that the purposes of adjusting the ejection performance of the ejector and improving the ejection ratio are achieved.
The working fluid inlet of the ejector main body 4 is also provided with an annular sealing groove, and the sealing ring 2 is arranged in the sealing groove, so that the sealing between the working nozzle 1 and the ejector main body 4 can be realized, and the hydrogen backflow is prevented from leaking outwards and the gas vacuum degree of the receiving chamber 403 is prevented from being influenced.
And a screwing external thread 401 matched with the sealing locking pressing cap 3 and screwed is further arranged at the working fluid inlet of the ejector main body 4.
The middle part of the ejector main body 4 connected with the working nozzle 1 is provided with a sealing locking pressure cap 3, and the inside of the sealing locking pressure cap 3 is provided with an internal thread 302 matched with a working fluid inlet of the ejector main body 4 in a screwing mode.
Through the screwing forward and backward movement of the sealing locking pressure cap 3 and the ejector main body 4, the sealing locking pressure cap 3 can move back and forth along the central axis direction, so that the sealing ring 2 is pressed by the annular sealing boss 301 of the sealing locking pressure cap 3, and the working nozzle 1 is locked and fixed.
The operation of the fuel cell injector with adjustable working nozzle is described in detail as follows:
hydrogen enters the ejector from the high-pressure storage tank through the connecting pipeline after being decompressed, and after passing through the working nozzle 1, the pressure of the original high-pressure hydrogen is reduced after being sprayed out through a fine nozzle, the flow rate can become very high, the formed beam-shaped gas enters the mixing chamber 405, and at this time, the receiving chamber 403 of the ejector main body 4 forms a vacuum negative pressure area around the working nozzle 1, so that low-pressure ejection fluid in the receiving chamber 403 is sucked into the mixing chamber 405; after entering the mixing chamber 405, the working fluid and the ejection fluid exchange kinetic energy and energy, and the pressure of the mixed gas gradually rises and enters the diffusion chamber 406; after the gas enters the diffusion chamber 406, the pressure of the mixed gas continues to rise and gradually reaches a stable gas pressure state, and then enters the stack to provide hydrogen gas at a stable pressure required for the operation of the fuel cell.
When the ejector works abnormally, the sealing locking pressing cap 3 is reversely finely adjusted in a left-handed mode by fixing the ejector main body 4 and using a wrench or working through a stepping motor, the sealing locking pressing cap 2 is partially loosened to ensure the compression degree of the sealing ring 2, the working nozzle 1 can be rotated, then the wrench or the stepping motor is used for working, and the working nozzle 1 is screwed in a forward right-handed or reverse left-handed mode to advance or retreat along the central axis direction of the ejector main body 4 so as to adjust the distance A between the working nozzle 1 and the throat 404 of the ejector main body. With the advance of the working nozzle 1, the vacuum degree in the receiving chamber 403 of the ejector main body 4 changes, and presents a nonlinear change which is increased firstly and then gradually reduced, and the required outlet pressure is selected according to the working requirement of the fuel cell to determine the optimal real-time distance A, so that the working performance of the ejector is in the optimal state and the maximum ejector ratio is ensured;
when the ejector is required to be maintained or the sealing ring 2 is required to be replaced, the ejector main body 4 is fixed, a wrench or a stepping motor is used for working, the sealing locking pressing cap 3 is reversely screwed, and the sealing locking pressing cap 3 and the working nozzle 1 are loosened and withdrawn to maintain or replace the sealing ring 2.
Claims (10)
1. A fuel cell ejector with an adjustable working nozzle comprises an ejector main body, the working nozzle, a sealing ring and a sealing locking pressing cap; the ejector main body consists of a receiving chamber, a mixing chamber and a diffusion chamber, and an inner thread, a thread, an annular sealing groove and a built-in sealing ring are arranged at a working fluid inlet of the ejector main body; a sealing locking pressing cap is arranged in the middle of the connection part of the ejector main body and the working nozzle, and a sealing ring is tightly pressed through screwing to prevent hydrogen leakage;
the outer portion of the body of the working nozzle is provided with an external thread which can be used for screwing, the working nozzle can horizontally move back and forth along the axis direction of the ejector main body through screwing with the internal thread of the ejector main body, and then the distance between the nozzle outlet and the ejector throat portion is changed to enable the working nozzle to reach an optimal distance value.
2. The fuel cell injector of the adjustable working nozzle as claimed in claim 1, wherein the external middle section of the working nozzle is provided with external threads for rotation adjustment movement, and further, the external threads are fine (but not limited to) straight threads;
preferably, the working nozzle is in the form of a beam.
3. The fuel cell injector with the adjustable working nozzle as claimed in claim 1, wherein the rear end of the working nozzle is provided with an internal thread with a sealing effect for connecting a pipeline; the internal thread is a conical sealing thread, preferably an NPT internal thread.
4. The fuel cell injector with the adjustable working nozzle as claimed in claim 1, wherein the rear end of the working nozzle is shaped as a square or a hexagon that can be tightened with a wrench.
5. The fuel cell injector with the adjustable working nozzle as claimed in claim 1, wherein the working fluid inlet of the injector body is provided with an internal thread which is matched and screwed with the working nozzle;
the working fluid inlet of the ejector main body is also provided with an external thread matched and screwed with the sealing locking pressing cap;
the working fluid inlet of the ejector main body is also provided with an annular sealing groove, and the sealing between the working nozzle and the ejector main body can be realized by installing a sealing ring in the sealing groove.
6. The sealing ring according to claim 5 is a hydrogen corrosion resistant sealing material, preferably the annular sealing ring is made of hydrogenated nitrile butadiene rubber HNBR.
7. The fuel cell injector with the adjustable working nozzle as claimed in claim 1, wherein the sealing and locking pressure cap is internally provided with an internal thread screwed with the working fluid inlet of the injector body.
8. The fuel cell injector of an adjustable working nozzle as claimed in claim 1, wherein an annular boss for pressing the annular sealing ring is further provided at a portion of the sealing and locking pressure cap, which is connected to the injector body.
9. The fuel cell injector with adjustable working nozzle of claim 8, wherein the sealing structure of the annular boss and the sealing ring is an end face sealing structure.
10. The fuel cell injector with the adjustable working nozzle as claimed in claim 1, wherein the working nozzle can be connected with a stepping motor by a coupling to realize electric automatic screwing so as to realize optimal injection performance and effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336962.4A CN112901566A (en) | 2021-03-30 | 2021-03-30 | Fuel cell ejector with adjustable working nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336962.4A CN112901566A (en) | 2021-03-30 | 2021-03-30 | Fuel cell ejector with adjustable working nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112901566A true CN112901566A (en) | 2021-06-04 |
Family
ID=76109471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110336962.4A Pending CN112901566A (en) | 2021-03-30 | 2021-03-30 | Fuel cell ejector with adjustable working nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112901566A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160325A (en) * | 2021-10-28 | 2022-03-11 | 山东大学 | Ejector adaptive to variable working condition adjustment |
| CN114251309A (en) * | 2022-02-24 | 2022-03-29 | 国家电投集团氢能科技发展有限公司 | Ejector and fuel cell system with same |
| CN115224300A (en) * | 2022-07-29 | 2022-10-21 | 大连海事大学 | Hydrogen ejector capable of accurately adjusting fuel cell circulating system |
| WO2023193383A1 (en) * | 2022-04-07 | 2023-10-12 | 北京亿华通科技股份有限公司 | Hydrogen ejector for fuel cell |
-
2021
- 2021-03-30 CN CN202110336962.4A patent/CN112901566A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160325A (en) * | 2021-10-28 | 2022-03-11 | 山东大学 | Ejector adaptive to variable working condition adjustment |
| CN114251309A (en) * | 2022-02-24 | 2022-03-29 | 国家电投集团氢能科技发展有限公司 | Ejector and fuel cell system with same |
| WO2023193383A1 (en) * | 2022-04-07 | 2023-10-12 | 北京亿华通科技股份有限公司 | Hydrogen ejector for fuel cell |
| CN115224300A (en) * | 2022-07-29 | 2022-10-21 | 大连海事大学 | Hydrogen ejector capable of accurately adjusting fuel cell circulating system |
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