CN210322477U - In-cylinder mixture sampling device integrated in spark plug - Google Patents
In-cylinder mixture sampling device integrated in spark plug Download PDFInfo
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- CN210322477U CN210322477U CN201921219107.XU CN201921219107U CN210322477U CN 210322477 U CN210322477 U CN 210322477U CN 201921219107 U CN201921219107 U CN 201921219107U CN 210322477 U CN210322477 U CN 210322477U
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Abstract
The utility model discloses an in-cylinder mixed gas sampling device integrated in a spark plug, which comprises an electric insulation ceramic core with a plurality of pore canals arranged in a metal shell, one small pore passage is provided with a spark plug component communicated with the high-pressure combustion chamber, the other large pore passage is provided with a mixed gas sampling component, the mixed gas sampling component comprises a metal mounting cylinder, an integrated valve body component and an electromagnetic driving component, the metal mounting cylinder is a hollow metal pipe, the inner space of the collecting chamber is a mixed gas collecting chamber, the top end of the metal mounting cylinder is provided with a conveying channel for external nitrogen and a diluting and sampling channel for the mixed gas, the collecting valve is provided with a gas channel for guiding the mixed gas in the cylinder into the collecting chamber, the electromagnetic driving assembly drives the valve connecting rod to move upwards to open the collecting valve after being electrified, the high-pressure mixed gas enters the collecting chamber, and the mixed gas in the cylinder is cooled and diluted by the nitrogen and flows to the outlet of the sampling channel along with the nitrogen. The utility model has the advantages that realize near quick real-time collection of spark plug clearance local gas ground in the engine cylinder.
Description
Technical Field
The utility model relates to a gas mixture sampling device in the jar, in particular to gas mixture sampling device in jar of integrated in spark plug insulating ceramic body.
Background
Optimizing the engine combustion process to achieve efficient, clean combustion has been an important direction in the development of internal combustion engines. The current research mainly observes and analyzes the combustion process of the combustible mixture in the combustion chamber through an optical means or a direct sampling means of gas in the cylinder. The analysis of the combustion components can realize the research on the mechanism of flame diffusion or propagation, and has important effects on the establishment of a combustion model and the optimization of the combustion process of an engine. The rapid in-cylinder direct sampling technology based on the crankshaft angle precision can extract in-cylinder gas under different crankshaft angles, and further can analyze the combustion process of the engine on the premise of not influencing the overall combustion process of the engine.
In-cylinder rapid sampling devices are generally used as an independent system in scientific research engines, and special modification needs to be carried out on a combustion chamber to install the in-cylinder rapid sampling device. Because the sampling valve has short opening time duration and small caliber, the sampling valve can only collect gas near the valve body each time. Therefore, the in-cylinder combustion measured by the fast sampling valve can only represent the area nearby, and the measurement result is also closely related to the installation position of the sampling valve.
The Gasoline Direct Injection (GDI) technology is one of the key technologies for realizing the next generation of high-efficiency gasoline engine, and is an important means for realizing the stratified lean combustion of the engine. However, the non-uniform distribution of the mixture from stratified lean combustion presents challenges to the proper operation of the ignition system. Theoretically, the mixture is required to form local rich mixture near the spark plug to help the formation of the initial fire core, and the formation of the layered mixture can be realized by matching the fuel injector with the in-cylinder flow field. In the working process of the engine, the circulation fluctuation of a flow field in the cylinder can obviously influence the distribution of the mixed gas in the cylinder, and further influence the transient air-fuel ratio near the gap of the spark plug. Therefore, how to accurately judge the transient air-fuel ratio near the spark gap and the process of forming the ignition core has important research significance for the layered lean combustion technology.
The utility model discloses a porous spark plug insulating ceramic body structure combines quick gas sampling system in the jar with the spark plug, realizes the real-time sampling of near spark gap gas mixture. The concentration of the mixture near the spark gap can be detected before the combustion process begins, and the intermediate products generated in the initial stage of combustion can be detected after the combustion begins, so that the chemical reaction process in the combustion process can be researched. This utility model has important meaning to the research and development process of layering rarefied combustion engine.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an in-cylinder gas mixture sampling device of integration in spark plug is provided, realize near spark gap gas mixture's quick real-time collection in the jar.
In order to solve the technical problem, the utility model provides an in-cylinder mixed gas sampling device integrated in a spark plug, the electrically insulating ceramic kernel including the multiple pore is installed in the metal shell, the multiple pore is two pores of a big diameter and a small diameter, one of them pore installs the spark plug subassembly that communicates with the high pressure combustion chamber, another large pore installs the mixed gas sampling subassembly, the mixed gas sampling subassembly includes a metal installation tube, a collection valve, a valve connecting rod connected with the collection valve and an electromagnetic drive subassembly thereof, the metal installation tube is a hollow metal tube, the inner space thereof is the mixed gas collection chamber, the top end of the metal installation tube is provided with a conveying channel of external nitrogen and a dilution sampling channel of mixed gas, the collection valve is provided with a gas circulation channel for leading-in mixed gas in the cylinder into the mixed gas collection chamber, the electromagnetic drive subassembly drives the valve connecting rod to move up after being electrified, opening the collection valve, high-pressure mixed gas enters the mixed gas collection chamber, the mixed gas in the cylinder is diluted and cooled by the externally input nitrogen, and flows to the outlet of the sampling channel along with the nitrogen, so that the local gas near the spark plug gap in the engine cylinder is rapidly collected, and the collected mixed gas is guided to the external gas detection equipment.
Two large and small pore channels in the electric insulation ceramic core are separated by a ceramic wall surface and are mutually sealed and electrically insulated.
The large pore channel in the electric insulating ceramic core is a stepped pore channel, the diameter of the lower part of the electric insulating ceramic core is smaller than that of the upper part of the electric insulating ceramic core, and a sealing surface is arranged at the transition section.
The lower end of the electric insulating ceramic kernel is provided with a metal sealing gasket to seal the electric insulating ceramic kernel and the metal installation cylinder; the central part of the metal sealing gasket is provided with a through hole with a sealing inclined plane, and sealing is formed between the through hole and the sealing inclined plane of the collection valve.
The spark plug component is divided into three sections, namely an upper electrode, a middle electric element and a lower high-voltage electrode, and the three sections are sintered in a small pore channel of an electric insulation ceramic core at high temperature through a high-temperature binder or by using an insulation filler.
The metal mounting cylinder integrally fixes, seals and positions the mixed gas sampling assembly in the large pore passage, so that the electric insulating ceramic body is prevented from being damaged by the quick opening and closing action of the valve; the bottom end of the metal mounting cylinder is tightly contacted with the metal sealing gasket to form sealing.
The collecting valve is a cylinder and is provided with a vent hole, when the collecting valve is opened, high-pressure mixed gas in the cylinder flows into the mixed gas collecting chamber through the vent hole, the center of the bottom end of the collecting valve is provided with the cylinder with a small diameter, and the conical sealing surface at the bottom end of the collecting valve is in close contact with the sealing inclined surface on the central through hole of the metal sealing gasket to realize the sealing of the high-pressure gas in the cylinder.
The metal shell is used for installing the in-cylinder mixed gas sampling device on an engine, realizing sealing, supporting and sealing internal non-metal components and providing connection of a spark ignition circuit and a ground pole.
The electromagnetic driving component comprises an external electromagnetic coil and a movable iron core driven by electromagnetic force, and the movable iron core, the valve connecting rod and the collecting valve are integrated into a valve body component. The movable iron core is in clearance fit with the middle hole of the metal installation cylinder and freely moves along the axial direction of the through hole. The valve connecting rod and the collecting valve are fixed through the elastic force of a spring, the lower end of the metal mounting cylinder is of an open structure, and the valve connecting rod and the collecting valve are mounted in the metal mounting cylinder. The electromagnetic coil is electrified, electromagnetic force is applied to the movable iron core, the movable iron core overcomes spring force to pull the valve connecting rod to open the acquisition valve, the electromagnetic coil is electrified to close the magnetic field, and the spring force pushes the valve connecting rod to close the acquisition valve.
The collection valve is normally in a closed state. An external electric control device provides an electric signal to electrify the electromagnetic coil, electromagnetic force is applied to the movable iron core, the movable iron core overcomes spring force to pull the valve connecting rod to open the collecting valve, high-pressure gas enters the mixed gas collecting chamber and flows to a sampling outlet along with nitrogen, a magnetic field is closed, and the spring pushes the collecting valve to be closed. In order to realize quick pushing, the control of the electromagnetic coil needs larger electromagnetic coil volume to provide enough driving force, so the electromagnetic coil is arranged outside the spark plug ceramic body; necessary mechanical parts are used for providing support on mechanical structures for the movable iron core, the collecting valve and the valve connecting rod, and the gas collecting valve is rapidly opened and closed.
The utility model discloses let in the nitrogen gas of certain flow at nitrogen gas transfer passage's entry, with direct sampling gas dilution in the jar, cooling and take away from the gaseous check out test set that the valve body guided to outside. Because the valve body is quickly opened and closed, the total amount of gas directly collected from the cylinder each time is very low, and the temperature is high, so that the chemical reaction of the frozen mixed gas is not facilitated. The nitrogen gas is used for diluting the mixed gas to make important gas components such as CO2、NOxThe equal content is in the range of measuring range detected by the emission instrument; and on the other hand for cooling of the mixture and the mixture collection assembly.
The utility model has the advantages that:
1) the utility model is based on the integral structure and material selection of the traditional spark plug, the ceramic integral structure design and processing technology of the traditional spark plug are very mature, high pressure and high temperature resistance are realized, and electric insulation is ensured;
2) the utility model discloses the application of porous electric insulating ceramic kernel makes under the prerequisite that does not change traditional spark plug external dimension and function, provides one or more intercommunication engine combustion chamber high pressure environment and outside atmospheric pore, installs gaseous collection valve in the pore, realizes near the quick real-time collection of spark gap local gas in the engine jar;
3) the collection of local gas in a combustion chamber is realized in a relatively compact space of the spark plug, particularly the gas in a cylinder close to a spark gap is quickly collected, and the function of the spark plug is not influenced;
4) the distance between the gas acquisition channel and the ignition electrode of the spark plug is very small, and the method has certain superiority on local gas sampling and local air-fuel ratio detection of the direct injection gasoline engine.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a view taken along line A-A of FIG. 1;
FIG. 3 is a view from the B-B direction of FIG. 1;
the reference numbers in the figures illustrate:
1-an electromagnetic coil; 2, making the movable iron core;
3-a spark plug assembly;
301 — upper electrode; 302-middle electrical element;
303 — high voltage electrode;
4-an electrically insulating ceramic core; 5-a spring;
6, a valve connecting rod; 7-earth pole;
8-insulating filler; 9-a metal housing;
10-collection valve; 11-guide and spring;
12-a metal mounting cylinder; 13-high voltage connection line;
14-a metal sealing gasket; and 15, venting holes.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows the structure schematic diagram of the implementation of the present invention, fig. 2 shows the top cross-sectional view of the upper end of the metal installation cylinder in the embodiment of the present invention, and fig. 3 shows the top view of the mixed gas collection valve in the embodiment of the present invention. As shown in fig. 1-3, the present invention provides an in-cylinder mixture sampling device integrated in a spark plug, which includes:
a metal housing 9, said metal housing 9 being responsible for the mounting and sealing of the spark plug on the engine, as well as for the support and sealing of the internal non-metallic components and providing the connection of the spark ignition circuit to the hook-shaped ground electrode 7. The metal shell 9 is provided with a mounting thread of a standard spark plug and is provided with a hook-shaped grounding pole 7 to be electrically communicated with the engine body;
the multi-channel electric insulation ceramic core 4 is arranged in the metal shell 9 and is provided with two channels with the diameters of one larger channel and one smaller channel, wherein the spark plug component 3 is arranged in one small channel, and the mixed gas sampling component is arranged in the other large channel. The two pore channels are separated by a ceramic wall surface with a certain thickness, so that gas sealing and electric insulation are realized; the outside of the porous electrically insulating ceramic core 4 is provided with a step and a sealing bevel for mounting in the metal casing 9 for fixation and sealing. The large pore in the electric insulation ceramic core 4 is a stepped pore, the diameter of the lower part of the large pore is smaller than that of the upper part of the large pore, and a sealing surface is arranged at the transition section. The lower end of the electric insulating ceramic core 4 is provided with a metal sealing gasket 14, so that the electric insulating ceramic core 4 and the metal installation cylinder 12 are sealed; the central part of the metal sealing gasket 14 is provided with a through hole with a sealing inclined plane, and sealing is formed between the through hole and the sealing inclined plane of the collection valve 10. The electrically insulating core 4 is made of ceramic, has a certain mechanical strength and is not damaged in the running process of the engine;
the spark plug component 3 is sintered in a small pore channel of the electric insulation core 4, and the small pore channel is communicated with the high-pressure combustion chamber; the spark plug assembly 3 is used to transmit a high voltage electrical signal from outside the combustion chamber to the inside of the combustion chamber, and under appropriate conditions, forms a circuit with the metal casing 9, generating an electric spark, igniting the surrounding combustible gas mixture. The spark plug component 3 is divided into three sections, namely an upper electrode 301, a middle electric element 302 and a lower high-voltage electrode 303, and is sintered in a small pore channel of the electric insulation core 4 at high temperature through a high-temperature adhesive or by using an insulation filler to realize installation and sealing;
the mixed gas sampling assembly comprises a metal mounting cylinder, a collecting valve, a valve connecting rod connected with the collecting valve, an electromagnetic driving movable iron core, a necessary electronic element for electrifying and powering off the electromagnetic coil, a necessary mechanical component for supporting the movable iron core, the valve and the valve connecting rod and a gas sampling channel for transmitting high-pressure mixed gas in the combustion chamber to a collecting outlet.
As shown in fig. 1, the implementation form of the mixed gas sampling assembly includes an electromagnetic coil 1, a movable iron core 2, a mixed gas sampling valve 10, a valve connecting rod 6, a spring 5 for assisting the valve to close, a metal mounting tube 12 and a metal sealing gasket 14, where the metal mounting tube 12 is fixed on an inner wall of a large bore of the electrical insulation core 4, and a lower end of the metal mounting tube is pressed against the metal sealing gasket 14 to realize sealing. The middle part of the metal sealing gasket 14 is provided with a through hole with a conical sealing surface, and the through hole and the conical sealing surface at the lower end of the collecting valve 10 realize sealing with high-pressure gas in the cylinder. The top end of the metal installation cylinder 12 is provided with two gas circulation channels for inputting nitrogen and collecting diluted mixed gas in the cylinder. The collection valve 10 is also provided with a gas flow channel for guiding the mixed gas in the cylinder into the mixed gas collection chamber when the collection valve 10 is opened.
The metal installation cylinder 12 is a hollow metal pipe, the inner space is a mixed gas collection chamber, nitrogen is introduced into an inner gas circulation channel, and the nitrogen conveys high-pressure mixed gas to a collection outlet.
The movable iron core 2, the valve connecting rod 6 and the collecting valve 10 are integrated into a valve body assembly, and are assembled into an integrated structure through welding. The movable iron core 2 is in clearance fit with the hole in the metal mounting cylinder 12 and freely moves along the axial direction of the through hole. The valve connecting rod 6 and the collecting valve 10 are pressed tightly by the elasticity of the spring 5, and the sealing is ensured while the positioning is carried out. The lower end of the metal installation cylinder 12 is an open structure, and the valve connecting rod 6 and the collection valve 10 are installed in the open structure. The integrated valve body component is in a normally closed state under the action of the spring force, and when the electromagnetic coil 1 is electrified, an electromagnetic field is generated, so that the movable ironThe core 2 is pulled up to drive the valve body assembly to move upwards, so that the mixed gas in the cylinder enters the mixed gas collecting chamber. The outer wall of the collection valve 10 and the inner wall of the mixed gas collection chamber are in clearance fit, and a guide effect is provided for movement of the valve body assembly. When the collection valve 10 is opened, gas enters the metal cavity from the ceramic body hole of the electrically insulating ceramic core 4 and flows into the mixed gas collection chamber through the notification guide hole provided in the collection valve 10. Nitrogen gas N flowing into the mixed gas collecting chamber2The in-cylinder mixture is cooled and diluted and sent out of the collection chamber through the small hole on the right side. The collected gas is collected with a collection bag and directed to a gas analyzer for measurement of its composition. When the collection valve 10 is closed, the sealing inclined plane of the lower end face is connected with the sealing inclined plane of the through hole below the mixed gas collection chamber, and the sealing inclined plane is sealed by utilizing the pretightening force provided by the spring.
The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and to those skilled in the art, the present invention may be variously modified and changed. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An in-cylinder mixture sampling device integrated in a spark plug, characterized in that: the electric insulation ceramic core comprising a plurality of channels is arranged in a metal shell, the plurality of channels are two channels with one larger diameter and one smaller diameter, one small channel is provided with a spark plug component communicated with a high-pressure combustion chamber, the other large channel is provided with a mixed gas sampling component, the mixed gas sampling component comprises a metal mounting cylinder, a collecting valve, a valve connecting rod connected with the collecting valve and an electromagnetic driving component thereof, the metal mounting cylinder is a hollow metal pipe, the inner space of the metal mounting cylinder is a mixed gas collecting chamber, the top end of the metal mounting cylinder is provided with an external nitrogen conveying channel and a mixed gas diluting and sampling channel, the collecting valve is provided with a gas circulation channel for guiding the mixed gas in the cylinder into the mixed gas collecting chamber, the electromagnetic driving component drives the valve connecting rod to move upwards after being electrified, the collecting valve is opened, the mixed gas in the cylinder enters the mixed gas collecting chamber, and the mixed gas in the cylinder is diluted and cooled by the externally input, and the gas is communicated to the outlet of the sampling channel along with the nitrogen, so that the local gas near the spark plug gap in the engine cylinder can be rapidly collected in real time.
2. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, wherein: two large and small pore channels in the electric insulation ceramic core are separated by a ceramic wall surface and are mutually sealed and electrically insulated.
3. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, wherein: the large pore channel in the electric insulation ceramic core is a stepped pore channel, the diameter of the lower part of the large pore channel is smaller than that of the upper part of the large pore channel, and a sealing surface is arranged at the transition section.
4. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, 2 or 3, wherein: the lower end of the electric insulating ceramic kernel is provided with a metal sealing gasket to seal the electric insulating ceramic kernel and the metal installation cylinder; the central part of the metal sealing gasket is provided with a through hole with a sealing inclined plane, and sealing is formed between the through hole and the sealing inclined plane of the collection valve.
5. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, wherein: the spark plug component is divided into three sections, namely an upper electrode, a middle electric element and a lower high-voltage electrode, and the three sections are sintered in a small pore channel of an electric insulation ceramic core at high temperature through a high-temperature binder or by using an insulation filler.
6. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, wherein: the metal installation cylinder integrally fixes, seals and positions the mixed gas sampling assembly in the large pore passage, and the bottom end of the metal installation cylinder is tightly contacted with the metal sealing gasket at the lower end of the electric insulation ceramic kernel to form sealing.
7. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, wherein: the collecting valve is a cylinder and is provided with a vent hole, when the collecting valve is opened, high-pressure mixed gas in the cylinder flows into the mixed gas collecting chamber through the vent hole, the center of the bottom end of the collecting valve is provided with the cylinder with a small diameter, and the conical sealing surface at the bottom end of the collecting valve is in close contact with the sealing inclined surface on the central through hole of the metal sealing gasket to realize the sealing of the high-pressure gas in the cylinder.
8. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, wherein: the metal shell is used for installing the in-cylinder mixed gas sampling device on an engine, realizing sealing, supporting and sealing internal non-metal components and providing connection of a spark ignition circuit and a ground pole.
9. The in-cylinder mixture sampling apparatus integrated in a spark plug according to claim 1, wherein: the electromagnetic driving assembly comprises an external electromagnetic coil and a movable iron core driven by electromagnetic force, the movable iron core, a valve connecting rod and a collecting valve are assembled into an integrated valve body assembly, the movable iron core is in clearance fit with a hole in the metal mounting cylinder and moves axially along a through hole, the valve connecting rod and the collecting valve are installed in an open structure at the lower end of the metal mounting cylinder and are fixed by spring force, the electromagnetic coil is electrified, the electromagnetic force is applied to the movable iron core, the movable iron core overcomes spring force to pull the valve connecting rod to open the collecting valve, the electromagnetic coil loses power to close a magnetic field, and the spring force pushes the valve connecting rod to close the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921219107.XU CN210322477U (en) | 2019-07-31 | 2019-07-31 | In-cylinder mixture sampling device integrated in spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921219107.XU CN210322477U (en) | 2019-07-31 | 2019-07-31 | In-cylinder mixture sampling device integrated in spark plug |
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| Publication Number | Publication Date |
|---|---|
| CN210322477U true CN210322477U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921219107.XU Active CN210322477U (en) | 2019-07-31 | 2019-07-31 | In-cylinder mixture sampling device integrated in spark plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210322477U (en) |
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2019
- 2019-07-31 CN CN201921219107.XU patent/CN210322477U/en active Active
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