JPH01187325A - Air fuel mixer for gas engine - Google Patents
Air fuel mixer for gas engineInfo
- Publication number
- JPH01187325A JPH01187325A JP884788A JP884788A JPH01187325A JP H01187325 A JPH01187325 A JP H01187325A JP 884788 A JP884788 A JP 884788A JP 884788 A JP884788 A JP 884788A JP H01187325 A JPH01187325 A JP H01187325A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- gas
- fuel
- air
- throttle valve
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000002737 fuel gas Substances 0.000 claims abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052799 carbon Inorganic materials 0.000 abstract description 17
- 239000003502 gasoline Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、都市ガスや液化石油ガス等の気体燃料を使用
して運転されるガスエンジンの空燃混合器に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air-fuel mixer for a gas engine operated using gaseous fuel such as city gas or liquefied petroleum gas.
（従来技術）
ガスエンジンの空燃混合器（以下、単にミキサーという
）はガソリン機関のキャブレターとほぼ同じ構造を採っ
ており、ベンチュリー部に生じた負圧力でダイヤフラム
式燃料供給量制・御具（ゼロガバナ）を介して気体燃料
を吸い込み、回転数制御具（ガバナ）で開閉制御される
スロットル弁で混合気の供給を調節するようになってい
る。(Prior art) The air-fuel mixer (hereinafter simply referred to as mixer) for a gas engine has almost the same structure as the carburetor for a gasoline engine, and uses a diaphragm type fuel supply amount control device ( Gaseous fuel is sucked in through a zero governor (zero governor), and the supply of air-fuel mixture is adjusted by a throttle valve that is opened and closed by a rotational speed controller (governor).
（解決しようとする課題）
ところが従来のミキサーでは、ガソリン機関と同じ考え
方をして、ミキサーにおけるスロットル弁は全閉時での
閉止性能を高めるため、第６図に示すように、スロット
ル弁の周側面における端縁部がピン角状に形成されてい
る。ガソリン機関の場合には、上述の構造で問題はなか
ったが、ガスエンジンのミキサーにあっては、エンジン
回転の制御性能が低下するという問題がある。(Problem to be solved) However, in conventional mixers, based on the same concept as in gasoline engines, the throttle valve in the mixer is designed to improve its closing performance when fully closed, as shown in Figure 6. The edge portion on the side surface is formed into a pin angle shape. In the case of a gasoline engine, there is no problem with the above-described structure, but in the case of a mixer for a gas engine, there is a problem in that the control performance of the engine rotation is deteriorated.
この原因を究明したところ、ガソリン機関ではスロット
ル弁配設部分における通路内周面部分でのカーボンの堆
積は殆ど見られないのに対し、ガスエンジンの場合には
スロットル弁配設部分における通路内周面にカーボンが
堆積しており、この堆積したカーボンが弁作動に影響を
与えていることに起因していることが判明した。When we investigated the cause of this problem, we found that in gasoline engines, there is almost no carbon accumulation on the inner circumferential surface of the passage where the throttle valve is installed; It was found that carbon was deposited on the surface, and this deposited carbon affected valve operation.
即ち、ガソリン機関の場合には、通路内周面に付着した
カーボンは吹き返し燃料で洗われて流入混合器によって
燃焼室に持ち去られるのに対し、ガスエンジンの場合に
は吹き返し燃料に洗浄効果を期待することができず、カ
ーボンが通路内周面に堆積してしまうことになる。そし
て、スロットル弁配設部分における通路内周面に堆積す
るカーボンはカーボンは偏って堆積することが多いこと
から、スロットル弁の全閉時に堆積量の少ない部分で隙
間ができエンジン回転数が高くなり過ぎる。In other words, in the case of a gasoline engine, carbon adhering to the inner peripheral surface of the passage is washed away by the blown-back fuel and carried away into the combustion chamber by the inflow mixer, whereas in the case of a gas engine, the blown-back fuel is expected to have a cleaning effect. This results in carbon being deposited on the inner circumferential surface of the passage. Carbon that accumulates on the inner peripheral surface of the passage in the throttle valve installation area often accumulates unevenly, so when the throttle valve is fully closed, a gap is created in the area where the amount of accumulation is small, causing the engine speed to increase. Pass.
また、堆積したカーボンにより弁体が膠着して、全閉位
置からの開弁作動時に弁体が作動しにくくなって、エン
ジン回転数が低くなり過ぎたり、ひどい場合にはエンジ
ンストップしたりする。Further, the accumulated carbon causes the valve body to stick, making it difficult for the valve body to operate when opening the valve from the fully closed position, causing the engine speed to become too low, or in severe cases, causing the engine to stop.
（課題を解決するための手段）
本発明は上記の課題を解決するためのもので、そのため
に、ガスエンジンに使用する空燃混合器において、ベン
チュリー部よりも下流側に配設したスロットル弁の周側
面における少なくとも弁軸から遠く位置する周側面部分
での端縁部を弧状に形成したことを特徴とするものであ
る。(Means for Solving the Problems) The present invention is intended to solve the above problems, and for this purpose, in an air-fuel mixer used in a gas engine, a throttle valve disposed downstream of a venturi section. The valve is characterized in that the end edge portion of the circumferential surface at least in a portion of the circumferential surface located far from the valve shaft is formed into an arc shape.
（作 用）
本発明では、スロットル弁の周側面における少なくとも
弁軸から遠く位置する周側面部分での端縁部を弧状に形
成しであるので、弁用面でのカーボンの噛み込み量が少
なくなるので、カーホンが偏って堆積した場合でも、弁
体の全閉時に周面に隙間ができにくくなるうえ、弁体が
全閉位置から開弁作動する際に弁体がカーボン層から離
脱し易くなる。(Function) In the present invention, the end edge of at least the portion of the circumferential surface of the throttle valve located far from the valve shaft is formed in an arc shape, so that the amount of carbon trapped on the valve surface is reduced. Therefore, even if carphone accumulates unevenly, it is difficult to form a gap on the circumferential surface when the valve body is fully closed, and the valve body is likely to separate from the carbon layer when the valve body is opened from the fully closed position. Become.
（実施例）
第１図〜第３図は本発明の実施例を示し、第１図は要部
の取出し断面図、第２図はガスミキサーの縦断面図、第
３図は第２図のＩＩ［−Ｉ線断面図である。(Example) Figures 1 to 3 show examples of the present invention. Figure 1 is a sectional view of the main parts, Figure 2 is a longitudinal sectional view of the gas mixer, and Figure 3 is the same as in Figure 2. II[-I is a sectional view taken along the line.
このガスミキサー（１）はガスエンジンの吸気ポート（
２）に接続されるボディ（３）の内部に透設した通路（
４）内にベンチュリー部（５）を形成し、このベンチュ
リー部（５）よりも吸気ポート（２）側に回転数制御具
（６）で開閉制御されるスロットル弁（７）が配置しで
ある。ベンチュリー部（５）にはガス供給源（８）から
ダイヤフラム式燃料供給量制御具（９）を介して都市ガ
ス等の気体燃料と、エアクリーナ（１０）を介して燃焼
用空気とが供給されている。This gas mixer (1) is connected to the gas engine's intake port (
A transparent passage (
4) A venturi part (5) is formed within the venturi part (5), and a throttle valve (7) whose opening/closing is controlled by a rotation speed controller (6) is arranged closer to the intake port (2) than the venturi part (5). . Gaseous fuel such as city gas is supplied from the gas supply source (8) to the venturi section (5) via a diaphragm type fuel supply amount control device (9), and combustion air is supplied via the air cleaner (10). There is.
スロットル弁（７）の弁体（１１）は弁軸（１２）を介
して弁箱（１３）に揺動可能に枢支されている。この弁
体（１１）は通路内周面（１４）の形状に対応する略楕
円形状に形成してあり、その周側面（１５）は、第１図
に示すように、前後端縁部（１６）をそれぞれ円弧状に
形成するとともにその円弧部分を直線で繋いだ形状に形
成しである。また、スロットル弁（７）の弁体（１１）
における弁軸枢支部（１７）の近傍部は弁軸（１２）に
対して直交する状態に切除されており、この弁軸枢支部
（１７）の近傍での通路内周面（１４）と弁体（１１）
の周側面（１５）との間の弁隙間（１８）は他の部分で
の弁隙間（１９）よりも広く形成しである。A valve body (11) of the throttle valve (7) is pivotally supported on a valve body (13) via a valve shaft (12). This valve body (11) is formed into a substantially elliptical shape corresponding to the shape of the inner circumferential surface (14) of the passage, and its circumferential side surface (15) has front and rear end edges (16) as shown in FIG. ) are each formed into a circular arc shape, and the circular arc portions are connected with straight lines. Also, the valve body (11) of the throttle valve (7)
The part near the valve shaft pivot part (17) in is cut out to be perpendicular to the valve shaft (12), and the passage inner circumferential surface (14) and the valve shaft near the valve shaft pivot part (17) are cut out. body (11)
The valve gap (18) between the circumferential side surface (15) and the valve gap (18) is wider than the valve gap (19) in other parts.
第４図及び第５図は本発明の別実施例を示し、第４図に
示すものは、スロットル弁（７）の弁体く１■）におけ
る周側面（１５）を前後端縁部（１６）をそれぞれ円弧
状に形成し、この円弧部分を曲線で繋いだ形状に形成し
たものであり、第５図に示すものは、スロットル弁（７
）の弁体（１１）における周側面（１５）を前端縁から
後端縁まで同一曲率の円弧で形成したものである。FIGS. 4 and 5 show another embodiment of the present invention, and the one shown in FIG. ) are each formed into an arc shape, and the arc portions are connected with a curved line.The one shown in Fig. 5 is a throttle valve (7
) The peripheral side surface (15) of the valve body (11) is formed by an arc having the same curvature from the front end edge to the rear end edge.
なお、上記各実施例においては、弁体（１１）の周縁部
のうち直線部分で形成されている弁軸枢支部（１７）を
除く部分で、その周側面（１５）の前後端縁部（１６）
を円弧状に形成しているが、弁体（１１）の弁軸（１２
）から遠い部分、即ち弁体（１１）の回転角度に対して
大きく移動する部分でのみ、その周側面（１５）の前後
端縁部（１６）を円弧状に形成してもよい。In addition, in each of the above embodiments, the front and rear end edges ( 16)
is formed in an arc shape, but the valve shaft (12) of the valve body (11)
), ie, a portion that moves significantly with respect to the rotation angle of the valve body (11), the front and rear edges (16) of the circumferential surface (15) may be formed into an arc shape.
以上の構成からなるガスミキサーでは、弁用面でのカー
ボンの噛み込み量が少なくなるので、カーボンが偏って
堆積した場合でも、弁体（１１）の全閉時に弁体周側面
（１５）と通路内周面（１４）との間に隙間ができにく
くなるうえ、弁体（１１）が全閉位置から開弁作動する
際に弁体（１１）がカーボン層から離脱し易くなり、回
転数制御具（６）での開閉制御を円滑に行うことができ
る。。In the gas mixer configured as described above, the amount of carbon trapped on the valve surface is reduced, so even if carbon is unevenly deposited, the valve body circumferential side surface (15) and the valve body side surface (15) when the valve body (11) is fully closed are Not only is it difficult to form a gap between the inner circumferential surface of the passageway (14), but also the valve element (11) is more likely to separate from the carbon layer when the valve element (11) opens from the fully closed position. Opening/closing control using the control tool (6) can be performed smoothly. .
（効 果）
本発明では、スロットル弁の周側面における少なくとも
弁軸から遠く位置する周側面部分での端縁部を弧状に形
成しであるので、弁用面でのカーボンの噛み込み量が少
なくなるので、カーボンが偏って堆積した場合でも、弁
体の全閉時に周面に隙間ができにくくなるうえ、弁体が
全閉位置から開弁作動する際に弁体がカーボン層から離
脱し易くなる。また、弁体の周面における周側端部を弧
状に形成しても弁体を全閉位置に作動させた場合には、
弁体の周面がカーボン層に食い込むことになるから、閉
止性能は低下することはない。(Effects) In the present invention, the end edge of at least the portion of the circumferential surface of the throttle valve located far from the valve shaft is formed in an arc shape, so that the amount of carbon trapped on the valve surface is reduced. Therefore, even if carbon is unevenly deposited, it is difficult to form a gap on the circumferential surface when the valve body is fully closed, and the valve body is likely to separate from the carbon layer when the valve body is opened from the fully closed position. Become. Furthermore, even if the circumferential end of the circumferential surface of the valve body is formed into an arc shape, when the valve body is operated to the fully closed position,
Since the circumferential surface of the valve body bites into the carbon layer, the closing performance will not deteriorate.
これにより、弁体の作動を円滑に行うことができ、エン
ジン回転速度の制御を高精度で行うことができる。Thereby, the valve body can operate smoothly, and the engine rotation speed can be controlled with high precision.
第１図〜第５図は本発明の実施例を示し、第１図は要部
の取出し断面図、第２図はガスミキサーの縦断面図、第
３図は第２図の■−■線断面図、第４図及び第５図は別
実施例の第１図相当図であり、第６図は従来例を示す第
１図相当図である。
５・・・ベンチュリー部、７・・・スロットル弁、１２
・・・弁軸、１５・・・（７）の周側面。
特許出願人 久保田鉄工株式会社
第１図
第４図
第６図
第５図
ｒ−’ −１
第２図Figures 1 to 5 show embodiments of the present invention, Figure 1 is a cross-sectional view of the main parts, Figure 2 is a longitudinal cross-sectional view of the gas mixer, and Figure 3 is the line ■-■ in Figure 2. The sectional view, FIGS. 4 and 5 are views corresponding to FIG. 1 of another embodiment, and FIG. 6 is a view corresponding to FIG. 1 showing a conventional example. 5... Venturi section, 7... Throttle valve, 12
...Valve stem, 15...(7) circumferential side. Patent applicant Kubota Iron Works Co., Ltd. Figure 1 Figure 4 Figure 6 Figure 5 r-'-1 Figure 2
Claims (1)
れる燃焼用空気と燃料ガスとを混合させる空燃混合器に
おいて、ベンチュリー部（５）よりも下流側に配設した
スロットル弁（７）の周側面（１５）における少なくと
も弁軸（１２）から遠く位置する周側面部分での端縁部
を弧状に形成したことを特徴とするガスエンジンの空燃
混合器1. In the air-fuel mixer, which is installed in the intake system of a gas engine and mixes combustion air and fuel gas taken into the combustion chamber, the throttle valve ( 7) An air-fuel mixer for a gas engine, characterized in that the end edge of at least a portion of the circumferential side surface (15) located far from the valve shaft (12) is formed in an arc shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63008847A JPH0749783B2 (en) | 1988-01-18 | 1988-01-18 | Gas engine air-fuel mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63008847A JPH0749783B2 (en) | 1988-01-18 | 1988-01-18 | Gas engine air-fuel mixer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01187325A true JPH01187325A (en) | 1989-07-26 |
| JPH0749783B2 JPH0749783B2 (en) | 1995-05-31 |
Family
ID=11704141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63008847A Expired - Fee Related JPH0749783B2 (en) | 1988-01-18 | 1988-01-18 | Gas engine air-fuel mixer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0749783B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047828A (en) * | 1983-08-26 | 1985-03-15 | Hitachi Ltd | Air control valve |
-
1988
- 1988-01-18 JP JP63008847A patent/JPH0749783B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047828A (en) * | 1983-08-26 | 1985-03-15 | Hitachi Ltd | Air control valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0749783B2 (en) | 1995-05-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |