CN102588160A - Gas inlet backfire preventer of gas engine - Google Patents
Gas inlet backfire preventer of gas engine Download PDFInfo
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- CN102588160A CN102588160A CN2012100568805A CN201210056880A CN102588160A CN 102588160 A CN102588160 A CN 102588160A CN 2012100568805 A CN2012100568805 A CN 2012100568805A CN 201210056880 A CN201210056880 A CN 201210056880A CN 102588160 A CN102588160 A CN 102588160A
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Abstract
The invention discloses a gas inlet backfire preventer of a gas engine. The gas inlet backfire preventer comprises a housing, a micro-resistance spring piece, a sealing piston, a connecting rod, a differential pressure sensing plate and a sealing spring. The micro-resistance spring piece mounted along the axis of a gas inlet pipe performs functions of both micro-resistance one-way valve and micro-resistance valve plate; with the micro-resistance one-way valve in the direction of the axis of the gas inlet pipe, the mixed gas can flow in one direction; due to the micro-resistance valve plate, the flow resistance is reduced under normal condition, the gas is also prevented from reflowing when backfire occurs; by a spring piston structure vertical to the direction of the axis, sealing can be carried out under normal condition, and gas can be quickly exhausted when backfire occurs. The gas inlet backfire preventer disclosed by the invention has an ingenious structure, and is capable of preventing backfire or preventing high-temperature gas flow from reflowing into a mixer and an air filter at the front end under the condition that the resistance of a gas inlet system is not increased, thereby guaranteeing the reliable operation of the gas engine. The gas inlet backfire preventer is simple in structure and convenient in installation and maintenance, and actively promotes popularization and application of the gas engine.
Description
Technical field
The present invention relates to a kind of flashback arrestor, be mainly used in the gas engine gas handling system.
Background technique
In recent years along with the growing tension of gasoline, diesel-fuel price and the attention of people's environmental pollution problem, be that the motor car engine of fuel obtains fast development with the combustion gas; Big and medium-sized cities combustion gas taxi and bus recoverable amount constantly rise at present, so the gas combustion automobile technology, have become one of important directions of following automotive engineering development.But the gas engine automobile is mostly simply transformed on original gasoline, diesel-oil vehicle basis and is formed at present; Consider that the original engine design is a fuel with gasoline or diesel oil, can not adapt to the characteristic of fuel gas after the preliminary repacking well.Especially in gas handling system, itself is easy to generate tempering original structure, and is prone to cause the high-temperature gas mixture body to flow backwards, and blasts; Correlation circumstance takes place can directly cause the damage of mixer and empty filter etc. if occur on the gas engine.
The gas combustion automobile engine aspirating system seldom is equipped with special flashback arrestor at present; And it is short partially and increased intake resistance that few part is installed backfireproof DeGrain, working life behind the flashback arrestor; Cause engine power to reduce, greatly influenced the application of gas combustion automobile.As gas engine air inlet back-fire arrangement, for example there are patent documentation CN-1963175A, CN-1963176A to be its related application.
The device that patent documentation CN-1963175A is provided is following: the backflow function is mainly realized by the switch valve of flow area; The sealing of admission line realizes through fitting tightly of endless belt that mainly the pressure release passage function when tempering takes place is made up of the annular space that rise big endless belt and tube wall form.It should be noted that; Though this dependence single-way switch valve is realized the valve of check function and can be guaranteed good non-return performance; But can there be comparatively significantly resistance in the proper flow process, thereby influences motor middle-low load performance and make maximum output descend obviously; In addition, endless belt and tube wall fit tightly and the big endless belt of rising when tempering takes place under the normal condition, and two kinds of situation alternately occur; Sealability under the normal condition can descend; And the pressure release of this structure is rapid inadequately, thereby might cause follow-up air inlet not smooth, influences the motor operation.
CN-1963176A has solved the excessive problem of forward flow resistance that exists among the CN-1963175A; The air inlet back-fire arrangement is reduced to the pressure relief device that the suction tude wall is installed; Pressure relief device mainly is made up of Packing spring, sealed valve core and sealing seat etc.; Structure is simple relatively, and the life-span of product also improves greatly.But the problem that this scheme exists is: do not have check function, so high-temperature mixer might flow backwards still and gets into the parts such as mixer of front end; The pressure release DeGrain, mixed gas had only few part to discharge through Decompression valves when tempering took place, and major part is present in the suction tude.Though thereby this kind scheme improved working life, can not guarantee the Core Feature of flashback arrestor reliably: non-return and quick pressure releasing.
Summary of the invention
The object of the present invention is to provide a kind of air inlet flashback arrestor, it guarantees to realize function of preventing back-fire, and can improve its working life under the situation that does not influence the inlet stream dynamic resistance.
A kind of gas engine air inlet flashback arrestor provided by the invention is characterized in that it comprises housing, little resistance spring sheet, packed-piston, connecting rod, pressure reduction induction piece, and Packing spring;
The housing two ends are respectively equipped with and are used for the inlet end and the outlet side that are connected with the gas handling system pipeline;
Little resistance spring sheet is positioned at the position of housing air flow chamber near inlet end, and is in the air flow chamber axial direction; Position near the outlet side on the sidewall of housing has relief hole, the installation that is sealed and matched of packed-piston and relief hole; Another sidewall of housing is provided with cylindrical air-pressure chamber; The pressure sensitive sheet is installed in the cylindrical air-pressure chamber; Be connected with packed-piston through connecting rod, be placed with Packing spring in the cylindrical air-pressure chamber, the pressure sensitive sheet is positioned at Packing spring top and can moves up and down at cylindrical air-pressure chamber; Cylindrical air-pressure chamber is communicated with air flow chamber top through an air-flow path, and air-flow path is used for sensing differential pressure to realize quick pressure releasing.
Among the present invention; The little resistance spring sheet that is arranged in the suction tude axial direction has been realized the dual functions of little resistance one-way valve and little resistance valve block; Little resistance one-way valve through the suction tude axial direction is promptly realized the mixed gas one-way flow; Through adopting little resistance valve block to reduce the flow resistance under the normal condition, can, tempering prevent again that simultaneously gas from flowing backwards when taking place; Spring piston structure through the vertical axis direction realizes the sealing under the normal condition and quick air releasing under the tempering situation takes place.
Structure of the present invention is ingenious; Can not increase under gas handling system resistance (corresponding can the reduce engine power) situation, guarantee to prevent tempering or high temperature gas flow flows backwards the back mixer and the empty filter of front end, thus assurance gas engine safe and reliable operation; Have simple in structure simultaneously; Advantages such as operation maintenance is convenient, and is with low cost can be promoting the use of gas engine and play positive promoting effect.
Description of drawings
Fig. 1 is the structural representation of flashback arrestor;
Fig. 2 is a flashback arrestor normal working schematic representation;
Working state schematic representation when Fig. 3 is flashback arrestor generation tempering;
Fig. 4 is the flashback arrestor scheme of installation, wherein, and 1 expression gas supply, 2 expression air supplies, 3 expression air-strainer, 4 expression mixers, 5 expression flashback arrestors, 6 expression motors.
Embodiment
Below through by embodiment the present invention being described in further detail, but following examples only are illustrative, and protection scope of the present invention does not receive these embodiments' restriction.
As shown in Figure 1, flashback arrestor comprises housing 51, little resistance spring sheet 52, packed-piston 53, connecting rod 54, pressure reduction induction piece 55, and Packing spring 56.
Little resistance spring sheet 52 is positioned at housing 51 air flow chamber, and the interior position near inlet end A of housing 51 air flow chamber is designed with support and is used for fixing little resistance spring sheet 52 and guarantees that it is in the air flow chamber axial direction; Position near outlet side B on the sidewall of housing 51 has relief hole 58, the installation that is sealed and matched of packed-piston 53 and relief hole 58; Another sidewall of housing 51 is provided with cylindrical air-pressure chamber 59; Pressure sensitive sheet 55 is installed in the cylindrical air-pressure chamber 59; Be connected with packed-piston 53 through connecting rod 54; Be placed with Packing spring 56 in the cylindrical air-pressure chamber 59, pressure sensitive sheet 55 is positioned at spring top and can moves up and down at cylindrical air-pressure chamber 59; Cylindrical air-pressure chamber is communicated with air flow chamber top through an air-flow path 57, and air-flow path 57 is used for sensing differential pressure to realize quick pressure releasing.
The one-way valve that little resistance spring sheet 52 constitutes is realized the little resistance operation under the normal condition and the quick fluid stopping under the tempering situation is taken place; The normal condition lower seal withstands corresponding packed-piston 53 by Packing spring 56 and realizes; When tempering takes place; Block air-flow front and back pressure difference through 55 inductions of pressure sensitive sheet and move downward, thereby form pressure release passage, to reach the purpose of quick pressure releasing to control corresponding packed-piston 53
Under the normal operation, main consideration reduces flow resistance as far as possible and guarantees sealing reliably.As shown in Figure 2, when being in normal working, mixed gas is flowed into by end A, and the guide functions through spring sheet flows through spring sheet from the outside, and final warp end B flows out.Among the design, adopt spring chip air ducting, less to the air inlet mobile obstacle, and its mobile obstacle effect increases with engine load and reduces, thus do not influence the engine power performance.The sealing of suction tude mainly fits tightly realization through packed-piston 53 and housing, and has installed the tightness that special-purpose Packing spring 55 guarantees that packed-piston 53 and housing 51 are fitted additional.
When the tempering situation takes place, consider that mainly strictness prevents that airflow reflux from realizing quick pressure releasing simultaneously.As shown in Figure 3, when tempering took place, high temperature gas flow was got into by end B, and impact spring sheet 52 makes it open, and fits in housing 51, thereby had stoped air-flow further to reflux to end A, thereby had realized preventing the tempering function.Along with high temperature gas flow gathers; End B chamber internal air pressure raises rapidly, simultaneously the pressure reduction induction piece about in the of 54 two ends pressure reduction constantly increase, when pressure reduction induction piece 54 pressure at two ends during greater than 55 spring forces; S will move downward; Drive packed-piston 53 simultaneously and move downward, thereby between packed-piston 53 and housing 51, formed pressure release passage, to have realized the quick pressure releasing function.
As shown in Figure 4; 1 expression gas supply; 2 expression air supplies, air stream gets into mixer 4 with combustion gas behind air-strainer 3; Mixer 4 outlets are connected with the inlet end A end of flashback arrestor 5, and flashback arrestor 5 outlet side B end is connected with rear portion gas handling system 6 (comprising throttle body and engine air inlet tube).It is little that the present invention has a forward circulating resistance; Can block backflow fast when taking place to flow backwards; And the characteristics of rapid pressure release, can prevent that the gas handling system tempering from causing damage to parts such as mixer and empty filters, thereby can guarantee the operation of gas engine safety and steady effectively.
The above is preferred embodiment of the present invention, but the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.So everyly do not break away from the equivalence of accomplishing under the disclosed spirit of the present invention or revise, all fall into the scope of the present invention's protection.
Claims (3)
1. a gas engine air inlet flashback arrestor is characterized in that, it comprises housing (51), little resistance spring sheet (52), packed-piston (53), connecting rod (54), pressure reduction induction piece (55), and Packing spring (56);
Housing (51) two ends are respectively equipped with and are used for the inlet end (A) and outlet side (B) that are connected with the gas handling system pipeline;
Little resistance spring sheet (52) is positioned at the position of housing (51) air flow chamber near inlet end (A), and is in the air flow chamber axial direction; Position near outlet side (B) on the sidewall of housing (51) has relief hole (58), the installation that is sealed and matched of packed-piston (53) and relief hole (58); Another sidewall of housing (51) is provided with cylindrical air-pressure chamber (59); Pressure sensitive sheet (55) is installed in the cylindrical air-pressure chamber (59); Be connected with packed-piston (53) through connecting rod (54); Be placed with Packing spring (56) in the cylindrical air-pressure chamber (59), pressure sensitive sheet (55) is positioned at Packing spring (56) top and can moves up and down in cylindrical air-pressure chamber (59); Cylindrical air-pressure chamber is communicated with air flow chamber top through an air-flow path (57), and air-flow path (57) is used for sensing differential pressure to realize quick pressure releasing.
2. gas engine air inlet flashback arrestor according to claim 1 is characterized in that, inlet end (A) and outlet side (B) at housing (51) two ends are designed to the pit ring-type.
3. gas engine air inlet flashback arrestor according to claim 1 and 2 is characterized in that little resistance spring sheet (52) is fixed on the housing (51) through support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210056880 CN102588160B (en) | 2012-03-06 | 2012-03-06 | Gas inlet backfire preventer of gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210056880 CN102588160B (en) | 2012-03-06 | 2012-03-06 | Gas inlet backfire preventer of gas engine |
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| Publication Number | Publication Date |
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| CN102588160A true CN102588160A (en) | 2012-07-18 |
| CN102588160B CN102588160B (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201210056880 Expired - Fee Related CN102588160B (en) | 2012-03-06 | 2012-03-06 | Gas inlet backfire preventer of gas engine |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB736460A (en) * | 1952-06-23 | 1955-09-07 | Paul Schnautz | Improvements relating to gas welding and cutting appliances |
| US4232704A (en) * | 1978-03-28 | 1980-11-11 | Amtrol Inc. | In line back flow preventer |
| JPS57107473A (en) * | 1980-12-23 | 1982-07-03 | Yasuhiko Imai | Safety device for inflammable gas |
| FR2544832A1 (en) * | 1983-04-22 | 1984-10-26 | Bayard Sa Ets | Non-return device for a water supply network |
| CN2934810Y (en) * | 2006-06-27 | 2007-08-15 | 梁伟 | Automatic pressure-reducing anti-explosion safe air tap for motorcycle tyre |
| JP2008115940A (en) * | 2006-11-02 | 2008-05-22 | Togo Seisakusho Corp | Check valve |
| CN201521967U (en) * | 2009-07-27 | 2010-07-07 | 北京鹤华安吉电子技术研究所 | Combination-type mechanical pressure relief anti-backfire device |
| CN202451309U (en) * | 2012-03-06 | 2012-09-26 | 华中科技大学 | Gas engine air intake flashback arrestor |
-
2012
- 2012-03-06 CN CN 201210056880 patent/CN102588160B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB736460A (en) * | 1952-06-23 | 1955-09-07 | Paul Schnautz | Improvements relating to gas welding and cutting appliances |
| US4232704A (en) * | 1978-03-28 | 1980-11-11 | Amtrol Inc. | In line back flow preventer |
| JPS57107473A (en) * | 1980-12-23 | 1982-07-03 | Yasuhiko Imai | Safety device for inflammable gas |
| FR2544832A1 (en) * | 1983-04-22 | 1984-10-26 | Bayard Sa Ets | Non-return device for a water supply network |
| CN2934810Y (en) * | 2006-06-27 | 2007-08-15 | 梁伟 | Automatic pressure-reducing anti-explosion safe air tap for motorcycle tyre |
| JP2008115940A (en) * | 2006-11-02 | 2008-05-22 | Togo Seisakusho Corp | Check valve |
| CN201521967U (en) * | 2009-07-27 | 2010-07-07 | 北京鹤华安吉电子技术研究所 | Combination-type mechanical pressure relief anti-backfire device |
| CN202451309U (en) * | 2012-03-06 | 2012-09-26 | 华中科技大学 | Gas engine air intake flashback arrestor |
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| CN102588160B (en) | 2013-06-19 |
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Granted publication date: 20130619 Termination date: 20140306 |