JPS6242105Y2

JPS6242105Y2 -

Info

Publication number: JPS6242105Y2
Application number: JP450086U
Authority: JP
Priority date: 1986-01-16
Filing date: 1986-01-16
Publication date: 1987-10-28
Also published as: JPS6245371U

Description

【考案の詳細な説明】（産業上の利用分野）本案は一個の気化器でガソリンおよびLPGをエ
ンジンに供給できる両用気化器の燃料切換え装置
に関するものである。[Detailed description of the invention] (Field of industrial application) This invention relates to a fuel switching device for a dual-use carburetor that can supply gasoline and LPG to an engine using a single carburetor.

（従来技術とその問題点） LPGはガソリンに比べて安価であることから、
例えば寒冷時のエンジン始動および暖機などには
ガソリンを使用するが通常のエンジン運転には
LPGを使用するなど適宜切換えて選択使用するこ
と、或いはLPGを常用しガソリンを予備燃料とし
て使用することが可能な両用気化器が用いられる
ことがある。(Prior art and its problems) Since LPG is cheaper than gasoline,
For example, gasoline is used to start and warm up the engine in cold weather, but for normal engine operation.
There are cases where a dual-purpose carburetor is used, which can use LPG or the like, or can use LPG regularly and gasoline as a backup fuel.

一般に両用気化器は圧力容器からベーパライザ
を経て気化器に至るLPG通路と、タンクから燃料
ポンプを経て気化器に至るガソリン通路とを具
え、これらの通路を交互に開閉することによつて
燃料の切換えを行なうもので、圧力容器とベーパ
ライザとの間に設けた開閉弁によるLPG通路の開
閉と、ポンプまたは通路適所に設けた開閉弁によ
るガソリン通路の開閉とを運転者によつて手動操
作される切換スイツチで交互に電気的に行なうよ
うに構成されている。従つて、ガソリンが浮子ま
たは膜によつて制御される計量室を経て主ノズル
等へ供給される構造の気化器においては、ガソリ
ンからLPGへ切換えたとき計量室に残存するガソ
リンが吸気路へ吸出されLPGと一緒にエンジンへ
送られるのできわめて高濃度の混合気が供給され
ることとなり、このため計量室のガソリンが空に
なるまでエンジン運転の不調、排気中の有害物質
の増大を招くという問題があつた。 Generally, dual-purpose vaporizers include an LPG passage from the pressure vessel to the vaporizer via the vaporizer, and a gasoline passage from the tank to the vaporizer via the fuel pump, and the fuel can be switched by alternately opening and closing these passages. The LPG passage is opened and closed by an on-off valve installed between the pressure vessel and the vaporizer, and the gasoline passage is opened and closed by an on-off valve installed at the pump or at an appropriate location in the passage, which is manually operated by the driver. It is configured to be electrically operated alternately with a switch. Therefore, in a carburetor that has a structure in which gasoline is supplied to the main nozzle through a metering chamber controlled by a float or membrane, when switching from gasoline to LPG, the gasoline remaining in the metering chamber is sucked out into the intake passage. Since the gasoline is sent to the engine together with LPG, an extremely highly concentrated mixture is supplied, leading to problems with engine operation and an increase in harmful substances in the exhaust until the gasoline in the metering chamber is empty. It was hot.

（問題点を解決するための手段）本案は開閉弁およびベーパライザを有し圧力容
器から噴口に至るLPG通路と、ポンプを有しタン
クから計量室に至るガソリン通路と、前記開閉弁
の開弁時に前記ポンプを停止させ閉弁時に駆動さ
せる切換スイツチと、計量室の出口に設けられた
開閉弁と、前記LPG通路の開閉弁とベーパライザ
との間の部分またはベーパライザの一次室に接続
された圧力スイツチとを具え、この圧力スイツチ
は計量室の出口の開閉弁を圧力が高くなつたとき
閉弁させるが低くなつたとき開弁させるように構
成したことにより前述の問題点を解決したもので
ある。(Means for solving the problem) This proposal includes an LPG passageway from the pressure vessel to the nozzle that has an on-off valve and a vaporizer, a gasoline passageway that has a pump and leads from the tank to the metering chamber, and when the on-off valve is opened. A changeover switch that stops the pump and drives it when the valve is closed, an on-off valve provided at the outlet of the metering chamber, and a pressure switch connected to a portion of the LPG passage between the on-off valve and the vaporizer or to the primary chamber of the vaporizer. This pressure switch solves the above-mentioned problem by configuring the on-off valve at the outlet of the metering chamber to be closed when the pressure becomes high and opened when the pressure becomes low.

（実施例）本案の実施例を図面に就いて説明すると、図に
おいて１は噴口２を有するLPGのベンチユリ、３
は主ノズル４を有するガソリンのベンチユリ、５
は絞り弁、６は吸気路、７は浮子８を有する計量
室（浮子室）であつて、LPGは圧力容器１１から
電磁駆動の開閉弁１２およびベーパライザ１４を
有するLPG通路１５を通つて噴口２へ供給され
る。ガソリンはタンク１６からソレノイド１７で
駆動される往復形のポンプ１８を有するガソリン
通路２１より浮子弁９を経て計量室７に入り燃料
通路１０を通つて主ノズル４および図示しない低
速系統、加速系統などへ供給される。(Example) An example of the present invention will be explained with reference to a drawing. In the figure, 1 is an LPG bench lily having a nozzle 2;
is a gasoline bench lily with main nozzle 4, 5
1 is a throttle valve, 6 is an intake passage, and 7 is a metering chamber (float chamber) having a float 8. LPG is passed from the pressure vessel 11 to the nozzle 2 through an LPG passage 15 having an electromagnetically driven on-off valve 12 and a vaporizer 14. supplied to Gasoline flows from the tank 16 through a gasoline passage 21 having a reciprocating pump 18 driven by a solenoid 17, passes through a float valve 9, enters the metering chamber 7, passes through a fuel passage 10, and then flows to the main nozzle 4, a low speed system, an acceleration system (not shown), etc. supplied to

前記開閉弁１２とポンプ１８とを駆動する各別
のソレノイド１３，１７は切換スイツチ２２によ
つて電源２３からの電流が交互に供給されて開閉
弁１２の開弁時にポンプ１８を停止させ閉弁時に
駆動させるものでポンプ１８は開閉弁の働きをす
る。このため吸気路６にはガソリンとLPGのいず
れかが供給される。ベーパライザ１４の一次室１
４ａには圧力スイツチ２４が接続され、また燃料
通路１０の計量室７に近い個所に開閉弁２５が設
けられ、この開閉弁２５を駆動するソレノイド２
６には前記電源２３からの電流が圧力スイツチ２
４を経て供給される。圧力スイツチ２４は一次室
１４ａの圧力が高いときは例えば0.1Kg／cm²以上
のとき開いて電流を遮断して開閉弁２５を閉弁さ
せるが、圧力が低いときは閉じて電流をソレノイ
ド２６へ供給し開閉弁２５を開弁させるもので、
開閉弁２５は主ジエツト１０ａの入口端面に接し
て燃料通路１０を閉鎖する。 The separate solenoids 13 and 17 that drive the on-off valve 12 and the pump 18 are alternately supplied with current from a power source 23 by a changeover switch 22, so that when the on-off valve 12 is opened, the pump 18 is stopped and closed. The pump 18 functions as an on-off valve. Therefore, either gasoline or LPG is supplied to the intake passage 6. Primary chamber 1 of vaporizer 14
A pressure switch 24 is connected to 4a, and an on-off valve 25 is provided in the fuel passage 10 near the measuring chamber 7, and a solenoid 2 that drives this on-off valve 25 is connected to the pressure switch 24.
6, the current from the power source 23 is applied to the pressure switch 2.
4. The pressure switch 24 opens when the pressure in the primary chamber 14a is high, for example 0.1 Kg/cm ² or more, to cut off the current and close the on-off valve 25, but when the pressure is low, it closes and passes the current to the solenoid 26. It supplies and opens the on-off valve 25.
The on-off valve 25 closes the fuel passage 10 in contact with the inlet end face of the main jet 10a.

このため、LPG通路１５を開いて圧力容器１１
のLPGが一次室１４ａへ送入されると計量室７の
出口の開閉弁２５が閉弁して計量室７のガソリン
の送出を阻止し、エンジンへはLPGのみが供給さ
れる。また、LPG通路１５を閉鎖すると同時にガ
ソリン通路２１を開いたときは一次室１４ａの圧
力低下によつて開閉弁２５が開弁し、エンジンへ
はガソリンのみが供給される。 For this reason, the LPG passage 15 is opened and the pressure vessel 11
When LPG is sent to the primary chamber 14a, the on-off valve 25 at the outlet of the metering chamber 7 closes to prevent gasoline from being sent out of the metering chamber 7, and only LPG is supplied to the engine. Further, when the LPG passage 15 is closed and the gasoline passage 21 is opened at the same time, the on-off valve 25 opens due to the pressure drop in the primary chamber 14a, and only gasoline is supplied to the engine.

尚、圧力スイツチ２４はLPG通路１５の開閉弁
１２とベーパライザ１４との間の部分に接続して
もよく、また、開閉弁２５は主ジエツト１０ａの
下流側の燃料通路１０を開閉するように構成する
こともある。 Note that the pressure switch 24 may be connected to a portion of the LPG passage 15 between the on-off valve 12 and the vaporizer 14, and the on-off valve 25 is configured to open and close the fuel passage 10 downstream of the main jet 10a. Sometimes I do.

（考案の効果）以上のように本案は交互に開閉されるLPG通路
とガソリン通路とを具えた両用気化器において、
LPG通路の開閉弁からベーパライザに至る部分ま
たはベーパライザの一次室に圧力スイツチを設
け、計量室の出口に設けた開閉弁をこの圧力スイ
ツチで開閉させるようにしたものであるから、ガ
ソリンからLPGに切換えたとき開閉弁下流の圧力
が高くなることを利用して計量室から吸気路へ吸
出されるガソリンを切換え直後に遮断できるので
ある。また、LPGからガソリンに切換えたときは
開閉弁下流に残存するLPGが吸気路へ吸出されて
消費され圧力を低下した時点で計量室の出口を開
くので、燃料をいずれに切換えてもガソリンと
LPGとが重複してエンジンに供給されるというこ
とが殆んどなくなるのである。このため、燃料切
換え時に高濃度の混合気がエンジンに供給されて
運転の不調、排気中の有害物質の増大という不都
合を招くことがなく、切換え時にも要求空燃比の
混合気を供給してエンジンを安定よく運転できる
ものである。また、ガソリン通路の開閉は燃料ポ
ンプの駆動と停止によるものであるから、開閉弁
を必要とせず部品品数の少ない切換え装置を提供
するものである。(Advantages of the Invention) As described above, the present invention is a dual-use carburetor having an LPG passage and a gasoline passage that are alternately opened and closed.
A pressure switch is provided in the section of the LPG passage from the on-off valve to the vaporizer or in the primary chamber of the vaporizer, and the on-off valve provided at the outlet of the metering chamber is opened and closed by this pressure switch. When gasoline is switched to LPG, the pressure downstream of the on-off valve increases, and this makes it possible to cut off the gasoline being drawn from the metering chamber into the intake passage immediately after switching. Also, when switching from LPG to gasoline, the LPG remaining downstream of the on-off valve is drawn into the intake passage and consumed, and the outlet of the metering chamber is opened at the point when the pressure drops, so regardless of which fuel is switched to, the gasoline and
This means that there is almost no chance of LPG being supplied to the engine at the same time. As a result, the engine is not supplied with a high-concentration mixture during fuel switching, which can cause problems such as poor operation or an increase in harmful substances in the exhaust, and the engine can be operated stably by supplying a mixture with the required air-fuel ratio even during switching. In addition, since the gasoline passage is opened and closed by driving and stopping the fuel pump, a switching device is provided that does not require an on-off valve and has a small number of parts.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本案の実施例を示す縦断面図である。２……噴口、４……主ノズル、６……吸気路、
７……計量室、１０……燃料通路、１１……圧力
容器、１２……開閉弁、１３……ソレノイド、１
３……ベーパライザ、１４ａ……一次室、１５…
…LPG通路、１６……タンク、１８……ポンプ、
２０……ソレノイド、２１……ガソリン通路、２
２……切換スイツチ、２３……電源、２４……圧
力スイツチ、２５……開閉弁、２６……ソレノイ
ド。 The drawing is a longitudinal sectional view showing an embodiment of the present invention. 2... Nozzle, 4... Main nozzle, 6... Intake path,
7...Measuring chamber, 10...Fuel passage, 11...Pressure vessel, 12...Opening/closing valve, 13...Solenoid, 1
3...Vaporizer, 14a...Primary chamber, 15...
...LPG passage, 16...tank, 18...pump,
20...Solenoid, 21...Gasoline passage, 2
2... Selector switch, 23... Power supply, 24... Pressure switch, 25... Open/close valve, 26... Solenoid.

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

開閉弁１２およびベーパライザ１４を有し圧力
容器１１から噴口２に至るLPG通路１５と、ポン
プ１８を有しタンク１６から計量室７に至るガソ
リン通路２１と、前記開閉弁１２の開弁時に前記
ポンプ１８を停止させ閉弁時に駆動させる切換ス
イツチ２２と、計量室７の出口に設けられた開閉
弁２５と、前記LPG通路１５の開閉弁１２とベー
パライザ１４との間の部分またはベーパライザ１
４の一次室１４ａに接続された圧力スイツチ２４
とを具え、この圧力スイツチ２４は計量室７の出
口の開閉弁２５を圧力が高くなつたとき閉弁させ
るが低くなつたとき開弁させるように構成したガ
ソリン−LPG両用気化器の燃料切換え装置。 An LPG passage 15 having an on-off valve 12 and a vaporizer 14 and leading from the pressure vessel 11 to the nozzle 2; a gasoline passage 21 having a pump 18 and leading from the tank 16 to the metering chamber 7; and when the on-off valve 12 is opened, the pump a changeover switch 22 that stops the valve 18 and drives it when the valve is closed; an on-off valve 25 provided at the outlet of the metering chamber 7; and a portion of the LPG passage 15 between the on-off valve 12 and the vaporizer 14 or the vaporizer 1.
Pressure switch 24 connected to primary chamber 14a of 4
This pressure switch 24 is a fuel switching device for a gasoline-LPG dual-purpose carburetor configured to close an on-off valve 25 at the outlet of the metering chamber 7 when the pressure becomes high and open it when the pressure becomes low. .