CN202040001U - Folding coaxial cavity microwave igniter for automobile engine - Google Patents
Folding coaxial cavity microwave igniter for automobile engine Download PDFInfo
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- CN202040001U CN202040001U CN2011200752946U CN201120075294U CN202040001U CN 202040001 U CN202040001 U CN 202040001U CN 2011200752946 U CN2011200752946 U CN 2011200752946U CN 201120075294 U CN201120075294 U CN 201120075294U CN 202040001 U CN202040001 U CN 202040001U
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Abstract
A folding coaxial cavity microwave igniter for an automobile engine belongs to the technical field of microwave application, which is formed by an integrated design of a quarter-wavelength coaxial resonant cavity, a gap coupling structure, a ladder-shaped coaxial matching structure, an N-shaped radio frequency coaxial connector. The quarter-wavelength coaxial resonant cavity is used for achieving body burning of a combustion chamber and sufficient burning of a gas-oil mixture under a lower input power. The gap coupling structure is used for completing microwave energy input of the quarter-wavelength coaxial resonant cavity and reducing influences of external circuits on the resonant cavity. The ladder-shaped coaxial matching structure is used for achieving good matching of a whole circuit. The N-shaped radio frequency coaxial connector serves as a microwave input port and can directly be used matched with the existing low cost microwave source. The folding coaxial cavity microwave igniter and the existing ignition plug have a similar shape, the folding coaxial cavity microwave igniter can be matched with the regular cylinder of a combustion motor, directly replace the existing ignition plug on the basis of changing no cylinder structures, and be high in combustion efficiency, low in production cost, good in processing repeatability, easy to produce in mass and the like.
Description
Technical field
The utility model belongs to technical field of microwave application, relates to the car engine ignition device.
Background technique
Spark ignition is petrolic technological core always, and it utilizes spark plug to produce spark, thereby makes the burning mixture burning after the compression.Yet, in above-mentioned combustion process, have a lot of potential energies not to be utilized, and burn insufficient, combustion efficiency is lower.Along with the continuous consumption of world energy sources, the continuous rising of oil price, the combustion efficiency that improves ignition system just becomes a kind of effective way of alleviating energy scarcity pressure.The microwave firing technique can be eliminated the very poor stratified mixture combustion of conventional usefulness by engine chamber internal irradiation microwave power is realized igniting, and combustion of mixed gas is rapider, more abundant, and combustion efficiency greatly improves, and has also reduced fuel consumption simultaneously significantly.This technology can make internal-combustion engine step out a very important step to energy-saving and emission-reduction.
At present, the most practical microwave firing technique is to realize by the plasma igniter of special use.This igniter can be when the input microwave power be low, and generation can puncture the electric field strength of gas mixture, and activated plasma is realized the microwave igniting.So the design of article on plasma body igniter is very crucial.It not only needs to satisfy the index request of microwave plasma ignition system, also needs to have the profile consistent with existing spark plug, so that directly substitute existing spark plug.It should be noted that in order to satisfy large-scale commercial demand that this type of igniter should have is integrated, exempt to debug, the advantage of high conformity, high reliability.And common plasma exciatiaon device does not possess These characteristics at present, can not satisfy the actual demand of microwave firing technique.
Summary of the invention
The utility model provides a kind of motor car engine with folding coaxial cavity microwave igniter, and its profile is all consistent with existing spark plug profile, can directly substitute existing spark plug on the basis that does not change the engine air cylinder structure.
Technical solutions of the utility model are:
A kind of motor car engine comprises inner wire and outer conductor with folding coaxial cavity microwave igniter; Described outer conductor is made of profile sealing in outer conductor external frame and the outer conductor; The external frame of described outer conductor comprises an outside thread that is connected with automobile engine cylinder 21 and six prismatic working surfaces 23 easy for removal and installation at least; The interior profile of described outer conductor is the cylindrical surface structure of different radii, comprise respectively with the most advanced and sophisticated 5 corresponding outer conductors of inner wire in profile 1, with inner wire one 41 corresponding outer conductors in profile 3 33 in profile 2 32 and the outer conductor, with inner wire 2 42 corresponding outer conductors in profile 4 34, with inner wire 3 43 corresponding outer conductors in profile 5 35; Described inner wire is made of inner wire 1, inner wire 2 42, inner wire 3 43, inner wire tip 5; Inner wire 1, inner wire 2 42, inner wire 3 43 are the cylindrical structure of coaxial connection, and three's radius increases gradually; Inner wire most advanced and sophisticated 5 is a cone, and the cone top is a hemisphere; Inner wire tip 5 links to each other with inner wire 1, and inner wire 1 links to each other with disk connecting conductor 61 near the side of bottom, and disk connecting conductor 61 links to each other with outer conductor by two fan-shaped column connecting conductors 62; Insulating mediums 7 are filled in other zones the zone in zone between inner wire and the outer conductor between inner wire most advanced and sophisticated 5 and the interior profile 1 of outer conductor and inner wire 3 43 and the outer conductor between the profile 5 35, profile 5 35 constitutes microwave input port 1 with inner wire 3 43 in the outer conductor, and its size is consistent with standard N type radio frequency (RF) coaxial connector.
A kind of motor car engine comprises inner wire and outer conductor with folding coaxial cavity microwave igniter; Described outer conductor is made of profile sealing in outer conductor external frame and the outer conductor; The external frame of described outer conductor comprises an outside thread that is connected with automobile engine cylinder 21 and six prismatic working surfaces 23 easy for removal and installation at least; The interior profile of described outer conductor is the cylindrical surface structure of different radii, comprise respectively with the most advanced and sophisticated 5 corresponding outer conductors of inner wire in profile 1, with inner wire one 41 corresponding outer conductors in profile 3 33 in profile 2 32 and the outer conductor, with inner wire 2 42 corresponding outer conductors in profile 4 34, with inner wire 3 43 corresponding outer conductors in profile 5 35; Described inner wire is made of inner wire 1, inner wire 2 42, inner wire 3 43, inner wire tip 5; Inner wire 1, inner wire 2 42, inner wire 3 43 are the cylindrical structure of coaxial connection, and three's radius increases gradually; Inner wire most advanced and sophisticated 5 is a cone, and the cone top is a hemisphere; Inner wire tip 5 links to each other with inner wire 1, and inner wire 1 links to each other with disk connecting conductor 61 near the side of bottom, and disk connecting conductor 61 links to each other with outer conductor by four cylindrical connecting conductors 62; Insulating mediums 7 are filled in other zones the zone in zone between inner wire and the outer conductor between inner wire most advanced and sophisticated 5 and the interior profile 1 of outer conductor and inner wire 3 43 and the outer conductor between the profile 5 35, profile 5 35 constitutes microwave input port 1 with inner wire 3 43 in the outer conductor, and its size is consistent with standard N type radio frequency (RF) coaxial connector.
Folding coaxial cavity microwave igniter described in the utility model comprises quarter wavelength coaxial resonant cavity, folding coaxial coupled structure, the coaxial matching structure of ladder, N type radio frequency (RF) coaxial connector four parts.The microwave energy of HIGH-POWERED MICROWAVES devices such as magnetron output is by waveguide or concentric cable feed-in N type radio frequency (RF) coaxial connector, enter in the quarter wavelength coaxial resonant cavity by coaxial matching structure of ladder and folding coaxial coupled structure, resonant cavity is terminal to be inserted in the firing chamber again; When quarter wavelength coaxial resonant cavity resonance, the microwave power of input 500W just can be in the terminal realization of resonant cavity inner wire greater than 2.25*10
7The electric field strength of V/m satisfies the threshold condition that 10 standard atmospheres are depressed activated plasma, thereby punctures the gas mixture around the resonant cavity inner wire end and produce plasma, realizes igniting; Subsequently, by the rapid movement of electronics in the firing chamber of plasma, realize the body burning of whole firing chamber as quick as thought and to the abundant burning of gas mixture.Fill pottery between the internal and external conductor of quarter wavelength coaxial resonant cavity, to realize the isolation of fuel oil and igniter inside.
Beneficial effect:
The utlity model has following advantage:
1, compare common spark plug, this igniter can be lighted very thin gas mixture and (see K Linkenheil for details, et al, A novel spark-plug for improved ignition in engines with gasoline direct injection (GDI), IEEE Transactions on Plasma Science, 33,2005,1696-1702, and F A Pertl, et al, Electromagnetic design of a novel microwave internal combustion engine ignition source, the quarter wave coaxial cavity igniter, Proceeding IMechE Part D:J.Automobile Engineering, 223,2009,1450-1474);
2, compare common spark plug, the ignition effectiveness of this igniter higher (seeing J E Smith for details, Integration of microwave plasma ignition into a multi-fuel engine, 2009);
3, this igniter does not have cathode construction, can avoid the focus load (seeing J E Smith for details, Integration of microwave plasma ignition into a multi-fuel engine, 2009) that produces between two electrodes of conventional ignition plug;
4, this igniter profile is consistent with the profile of existing spark plug, is complementary with conventional automobile engine cylinder;
5, the degree of coupling size of the folding coaxial coupled structure in this igniter is easy to regulate, and is convenient to design;
6, but this igniter integrated design processing need not debugging, and symmetrical configuration is suitable for producing in enormous quantities;
7, this igniter can be transplanted to easily in other plasma igniting systems and use.
Description of drawings
Fig. 1 is first kind of motor car engine sectional view that folds coaxial cavity microwave igniter that the utility model provides.
Fig. 2 is first kind of motor car engine plan view that folds coaxial cavity microwave igniter that the utility model provides.
Fig. 3 is second kind of motor car engine sectional view that folds coaxial cavity microwave igniter that the utility model provides.
Fig. 4 is second kind of motor car engine plan view that folds coaxial cavity microwave igniter that the utility model provides.
Embodiment
Embodiment 1
A kind of motor car engine comprises inner wire and outer conductor with folding coaxial cavity microwave igniter; Described outer conductor is made of profile sealing in outer conductor external frame and the outer conductor; The external frame of described outer conductor comprises an outside thread that is connected with automobile engine cylinder 21 and six prismatic working surfaces 23 easy for removal and installation at least; The interior profile of described outer conductor is the cylindrical surface structure of different radii, comprise respectively with the most advanced and sophisticated 5 corresponding outer conductors of inner wire in profile 1, with inner wire one 41 corresponding outer conductors in profile 3 33 in profile 2 32 and the outer conductor, with inner wire 2 42 corresponding outer conductors in profile 4 34, with inner wire 3 43 corresponding outer conductors in profile 5 35; Described inner wire is made of inner wire 1, inner wire 2 42, inner wire 3 43, inner wire tip 5; Inner wire 1, inner wire 2 42, inner wire 3 43 are the cylindrical structure of coaxial connection, and three's radius increases gradually; Inner wire most advanced and sophisticated 5 is a cone, and the cone top is a hemisphere; Inner wire tip 5 links to each other with inner wire 1, and inner wire 1 links to each other with disk connecting conductor 61 near the side of bottom, and disk connecting conductor 61 links to each other with outer conductor by two fan-shaped column connecting conductors 62; Insulating mediums 7 are filled in other zones the zone in zone between inner wire and the outer conductor between inner wire most advanced and sophisticated 5 and the interior profile 1 of outer conductor and inner wire 3 43 and the outer conductor between the profile 5 35, profile 5 35 constitutes microwave input port 1 with inner wire 3 43 in the outer conductor, and its size is consistent with standard N type radio frequency (RF) coaxial connector.
In the technique scheme, the external frame of described outer conductor also comprises a cylindrical transitional surface 22, and described cylindrical transitional surface 22 is between the outside thread 21 that is connected with automobile engine cylinder and six prismatic working surface 23 easy for removal and installation.
In the technique scheme, the material selection platinum at described inner wire tip 5, the material selection high temperature resistance of all the other inner wires and outer conductor, anti-charing, anti-oxidation metal, described insulating medium 8 is a ceramic dielectric.
Embodiment 2
A kind of motor car engine comprises inner wire and outer conductor with folding coaxial cavity microwave igniter; Described outer conductor is made of profile sealing in outer conductor external frame and the outer conductor; The external frame of described outer conductor comprises an outside thread that is connected with automobile engine cylinder 21 and six prismatic working surfaces 23 easy for removal and installation at least; The interior profile of described outer conductor is the cylindrical surface structure of different radii, comprise respectively with the most advanced and sophisticated 5 corresponding outer conductors of inner wire in profile 1, with inner wire one 41 corresponding outer conductors in profile 3 33 in profile 2 32 and the outer conductor, with inner wire 2 42 corresponding outer conductors in profile 4 34, with inner wire 3 43 corresponding outer conductors in profile 5 35; Described inner wire is made of inner wire 1, inner wire 2 42, inner wire 3 43, inner wire tip 5; Inner wire 1, inner wire 2 42, inner wire 3 43 are the cylindrical structure of coaxial connection, and three's radius increases gradually; Inner wire most advanced and sophisticated 5 is a cone, and the cone top is a hemisphere; Inner wire tip 5 links to each other with inner wire 1, and inner wire 1 links to each other with disk connecting conductor 61 near the side of bottom, and disk connecting conductor 61 links to each other with outer conductor by four cylindrical connecting conductors 62; Insulating mediums 7 are filled in other zones the zone in zone between inner wire and the outer conductor between inner wire most advanced and sophisticated 5 and the interior profile 1 of outer conductor and inner wire 3 43 and the outer conductor between the profile 5 35, profile 5 35 constitutes microwave input port 1 with inner wire 3 43 in the outer conductor, and its size is consistent with standard N type radio frequency (RF) coaxial connector.
In the technique scheme, the external frame of described outer conductor also comprises a cylindrical transitional surface 22, and described cylindrical transitional surface 22 is between the outside thread 21 that is connected with automobile engine cylinder and six prismatic working surface 23 easy for removal and installation.
In the technique scheme, the material selection platinum at described inner wire tip 5, the material selection high temperature resistance of all the other inner wires and outer conductor, anti-charing, anti-oxidation metal, described insulating medium 8 is a ceramic dielectric.
The folding coaxial cavity igniter that the utility model provides can be regarded as by quarter wavelength coaxial resonant cavity, folding coaxial coupled structure, the coaxial matching structure of ladder, N type radio frequency (RF) coaxial connector and combines; Theoretically, the length of quarter wavelength coaxial resonant cavity should be medium and fills 1/4th of coaxial line wavelength, but the influence that is subjected to inner wire tip 5, energy coupling feed-in form during actual design is slightly different; The interior external diameter of the quarter wavelength coaxial resonant cavity of each folding coaxial cavity igniter is also different; The bottom of quarter wavelength coaxial resonant cavity is folding coaxial coupled structure, it can be regarded as by inside and outside two-layer coaxial configuration and constitutes, the outer conductor of outer coaxial configuration is a quarter wavelength coaxial resonant cavity outer conductor, the inner wire of internal layer coaxial configuration is a quarter wavelength coaxial resonant cavity inner wire, and the inner wire of outer coaxial configuration is the outer conductor of internal layer coaxial configuration; By the perceptual window on the outer coaxial configuration inner wire sidewall energy is coupled into the quarter wavelength coaxial resonant cavity, the size of regulating perceptual window can be controlled the power of coupling in the larger context, thereby control the Q of whole folding coaxial cavity igniter, be convenient to design; Electrical characteristic according to different quarter wavelength coaxial resonant cavities and folding coaxial coupled structure, need the coaxial matching structure of the corresponding ladder of design, this structure is made of profile 5 35 in profile 4 34, the outer conductor in profile in the outer conductor 3 33, the outer conductor and corresponding inner wire; The coaxial matching structure of ladder has symmetrical structure, is convenient to processing, and easily and remaining part integrate; The design object of folding coaxial cavity igniter is: the reflection coefficient at the resonant frequency place is as far as possible little, and Q is high as far as possible, and when the input microwave power was 500W, the average field intensity of folding coaxial cavity igniter end needed greater than 2.25*10
7V/m to guarantee in the cylinder of 10 standard atmospheric pressures activated plasma effectively, realizes igniting.
Through the design of electromagnetism all-wave simulation software, reflection coefficient is all less than-20dB when resonance for this folding coaxial cavity igniter of two kinds, and when the input microwave power was 500W, the average field intensity of igniter end was all greater than 2.25*10
7V/m.
Claims (4)
1. a motor car engine comprises inner wire and outer conductor with folding coaxial cavity microwave igniter; Described outer conductor is made of profile sealing in outer conductor external frame and the outer conductor; The external frame of described outer conductor comprises an outside thread that is connected with automobile engine cylinder (21) and six prismatic working surfaces (23) easy for removal and installation at least; The interior profile of described outer conductor is the cylindrical surface structure of different radii, comprise respectively with the corresponding outer conductor in inner wire tip (5) in profile one (31), with inner wire one (41) corresponding outer conductor in profile three (33) in profile two (32) and the outer conductor, with inner wire two (42) corresponding outer conductors in profile four (34), with the interior profile five (35) of inner wire three (43) corresponding outer conductors; Described inner wire is made of inner wire one (41), inner wire two (42), inner wire three (43), inner wire tip (5); Inner wire one (41), inner wire two (42), inner wire three (43) are the cylindrical structure of coaxial connection, and three's radius increases gradually; Inner wire tip (5) is a cone, and the cone top is a hemisphere; Inner wire tip (5) links to each other with inner wire one (41), and inner wire one (41) links to each other with disk connecting conductor (61) near the side of bottom, and disk connecting conductor (61) links to each other with outer conductor by two fan-shaped column connecting conductors (62); Insulating mediums (7) are filled in other zones the zone in zone between inner wire and the outer conductor between inner wire tip (5) and the interior profile one (31) of outer conductor and inner wire three (43) and the outer conductor between the profile five (35), profile five (35) constitutes microwave input port (1) with inner wire three (43) in the outer conductor, and its size is consistent with standard N type radio frequency (RF) coaxial connector.
2. a motor car engine comprises inner wire and outer conductor with folding coaxial cavity microwave igniter; Described outer conductor is made of profile sealing in outer conductor external frame and the outer conductor; The external frame of described outer conductor comprises an outside thread that is connected with automobile engine cylinder (21) and six prismatic working surfaces (23) easy for removal and installation at least; The interior profile of described outer conductor is the cylindrical surface structure of different radii, comprise respectively with the corresponding outer conductor in inner wire tip (5) in profile one (31), with inner wire one (41) corresponding outer conductor in profile three (33) in profile two (32) and the outer conductor, with inner wire two (42) corresponding outer conductors in profile four (34), with the interior profile five (35) of inner wire three (43) corresponding outer conductors; Described inner wire is made of inner wire one (41), inner wire two (42), inner wire three (43), inner wire tip (5); Inner wire one (41), inner wire two (42), inner wire three (43) are the cylindrical structure of coaxial connection, and three's radius increases gradually; Inner wire tip (5) is a cone, and the cone top is a hemisphere; Inner wire tip (5) links to each other with inner wire one (41), and inner wire one (41) links to each other with disk connecting conductor (61) near the side of bottom, and disk connecting conductor (61) links to each other with outer conductor by four cylindrical connecting conductors (62); Insulating mediums (7) are filled in other zones the zone in zone between inner wire and the outer conductor between inner wire tip (5) and the interior profile one (31) of outer conductor and inner wire three (43) and the outer conductor between the profile five (35), profile five (35) constitutes microwave input port (1) with inner wire three (43) in the outer conductor, and its size is consistent with standard N type radio frequency (RF) coaxial connector.
3. motor car engine according to claim 1 and 2 is with folding coaxial cavity microwave igniter, it is characterized in that, the external frame of described outer conductor also comprises a cylindrical transitional surface (22), and described cylindrical transitional surface (22) is positioned between the outside thread (21) that is connected with automobile engine cylinder and the six prismatic working surface (23) easy for removal and installation.
4. motor car engine according to claim 1 and 2 is with folding coaxial cavity microwave igniter, it is characterized in that, the material selection platinum at described inner wire tip (5), the material selection high temperature resistance of all the other inner wires and outer conductor, anti-charing, anti-oxidation metal, described insulating medium (8) is a ceramic dielectric.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200752946U CN202040001U (en) | 2011-03-21 | 2011-03-21 | Folding coaxial cavity microwave igniter for automobile engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200752946U CN202040001U (en) | 2011-03-21 | 2011-03-21 | Folding coaxial cavity microwave igniter for automobile engine |
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| CN202040001U true CN202040001U (en) | 2011-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904243A (en) * | 2021-01-18 | 2021-06-04 | 电子科技大学 | High-efficiency concentrated microwave magnetic field resonant cavity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112904243A (en) * | 2021-01-18 | 2021-06-04 | 电子科技大学 | High-efficiency concentrated microwave magnetic field resonant cavity |
| CN112904243B (en) * | 2021-01-18 | 2021-12-03 | 电子科技大学 | High-efficiency concentrated microwave magnetic field resonant cavity |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111116 Termination date: 20160321 |
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| CF01 | Termination of patent right due to non-payment of annual fee |