JP2724568B2 - Fuel supply system for kerosene engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a kerosene engine, and in particular, mixes gasoline with kerosene and supplies it to the engine when the fluidity of kerosene decreases. The present invention relates to a fuel supply device.

(Prior Art) As an internal combustion engine used for an outboard motor or the like, there is an engine using kerosene as a fuel, in particular, white kerosene (kerosene).

A carburetor of an internal combustion engine using kerosene (hereinafter referred to as a kerosene engine) includes a kerosene supply system and a gasoline supply system, supplies gasoline at the time of starting and sends the mixture to the engine, and after starting, switches to the kerosene mixture to start the engine. It is made to supply to.

That is, as shown in FIG. 3, the carburetor includes a starting gasoline nozzle 3, a slow nozzle 5 communicating with a kerosene throw system 4, and a main nozzle 7 communicating with a kerosene main system 6 in an intake passage 2 of a carburetor body 1. Gasoline is pumped from a gasoline tank (GT) by a gasoline pump 8, flows through a needle valve 10 opened and closed by a float 9 as indicated by a black arrow, and is sent to a gasoline chamber 11 in the carburetor body 1. Alternatively, kerosene is pumped from a kerosene tank (KT) by a kerosene pump 12, flows through a needle valve 14 opened and closed by a float 13, as indicated by a dotted arrow, and is sent to a kerosene chamber 15 in the carburetor body 1.

As a result, gasoline is sucked from the gasoline chamber 11 into the gasoline nozzle 3 by the intake negative pressure at the time of starting to form a gasoline mixture (G), and fuel is supplied as a pilot and slow system. Kerosene is sucked from 15 into a kerosene slow nozzle and main nozzles 5 and 7 to form a kerosene mixture (K), and fuel is supplied as a slow and main system.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional fuel supply device, kerosene has a higher viscosity than gasoline, so that when the temperature becomes low, the main or slow passages may be sucked up due to viscous resistance. It became difficult, and there was a problem that the connection from the slow to the main was poor and an engine stall was caused.

In view of the above, an object of the present invention is to provide a fuel supply device for a kerosene engine that improves the engine operation failure when the fluidity of the kerosene decreases at a low temperature or the like.

[Configuration of the invention]

(Means for Solving the Problems) In order to solve the problems of the above-described conventional technology, the present invention provides:
A gasoline chamber connected to a gasoline pump via a gasoline supply passage, for supplying gasoline in the gasoline chamber to a pilot passage and a slow passage of the carburetor; and a kerosene pump via a kerosene supply passage. A kerosene supply system for supplying kerosene in the kerosene chamber to a slow passage and a main passage of the carburetor, wherein the kerosene is branched from the gasoline supply passage. A gasoline branch passage that opens to the chamber is formed, and a switching cock that opens and closes the passage is provided in the gasoline branch passage, and each passage is opened and closed at each end of the kerosene supply passage and the gasoline branch passage that opens into the kerosene chamber. Needle valves are provided to control the float movement in the kerosene chamber. Flip each needle valve so that each needle valve is opened and closed simultaneously with coupling provided in parallel to the float, characterized in that interposing a jet needle valve upstream of the gas branch passage.

(Operation) When the fluidity of the kerosene decreases, the switching cock is opened and gasoline from the gasoline pump is supplied to the kerosene chamber of the carburetor, and gasoline is mixed with the kerosene in the chamber and the fluidity is reduced. And a good suction is made by the intake negative pressure, so that the air-fuel mixture can be supplied to the engine. When sufficient fluidity is obtained only with kerosene, closing the switching cock cuts off the supply of gasoline into the kerosene chamber, and supplies only kerosene to supply the kerosene mixture to the engine.

(Embodiment) Hereinafter, the present invention will be described using the embodiment shown in FIGS. 1 and 2 together with the carburetor shown in FIG.

A needle valve 16 for gasoline is arranged in parallel with a needle valve 14 of a kerosene supply system which is opened and closed by a float 13 in a kerosene chamber 15 of the carburetor body 1. The needles 14A and 16A of the needle valves 14 and 16 The valve seats 14B and 16B are closed by being pressed by the floating. A kerosene supply passage 17 and a gasoline supply passage 18 are connected to the valve seats 14B and 16B, respectively, and a jet 19 is interposed in the gasoline supply passage 18.

The gasoline supply passage 18 is connected to a passage 21 branched from a passage 20 for supplying gasoline from the gasoline pump 8 to the gasoline chamber 11 of the carburetor body 1 as shown by a chain line in FIG. The section 22 is provided with a switching cock 23. The switching cock 23 has an OFF position and an ON position as illustrated in FIG. 2. When the switching cock 23 is turned ON, the passage 20 and the branch passage 21 communicate with each other. It is formed so that it becomes.

 Next, the operation of the above embodiment will be described.

When the temperature is high and there is no problem in the flowability of kerosene, the switching cock 23 is turned off. As a result, gasoline does not flow into the kerosene chamber 15, but only kerosene is sucked out and supplied to the engine as a kerosene mixture (K).

When the temperature is low and there is a problem with the flowability of kerosene, the switching cock 23 is turned on. Then, gasoline from the gasoline pump 8 also flows to the branch passage 21, and the gasoline supply passage 18,
Gasoline is supplied to the kerosene chamber 15 through the jet 19 and the needle valve 16, and the kerosene and gasoline mixed in the chamber 15 have a moderately reduced viscosity, have a good fluidity, and are not interrupted by the intake negative pressure. Good suction. In this case, by selecting the jet 19, the mixing ratio between gasoline and kerosene can be changed, and the required gasoline supply amount can be reduced.

〔The invention's effect〕

As described above, according to the present invention, gasoline can be mixed with kerosene and supplied at any time when kerosene fluidity is poor, so that problems such as poor connection to the main due to poor flow of kerosene and engine stalls are eliminated. Thus, even at a low temperature, the operation of the kerosene engine can be performed smoothly, and the market for the kerosene engine can be expanded. Further, since the supply and stop of gasoline can be performed by one-touch operation of the switching cock, handling is easy, and there are various effects such as minimizing gasoline consumption by adjusting the flow of gasoline.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially sectional explanatory view showing an embodiment of a fuel supply device for a kerosene engine according to the present invention, FIG. 2 is a plan view of the switching cock, and FIG. FIG. 3 is a partially sectional perspective view showing a carburetor of a kerosene engine to which the present invention is applied. 1 carburetor body, 2… intake passage, 11… gasoline chamber, 14… kerosene needle valve, 15… kerosene chamber, 16… gasoline needle valve, 21… branch passage, 23… changeover cock.

Claims (1)

(57) [Claims] A gasoline chamber connected to a gasoline pump via a gasoline supply passage, for supplying gasoline in the gasoline chamber to a pilot passage and a slow passage of a carburetor, and a kerosene supply to a kerosene pump. A kerosene chamber connected through a gas passage, and a kerosene supply system for supplying kerosene in the kerosene chamber to a slow passage and a main passage of the carburetor. A gasoline branch passage that branches off and opens to the kerosene chamber; a switching cock that opens and closes the passage is provided in the gasoline branch passage; and each end of the kerosene supply passage and the gasoline branch passage that opens into the kerosene chamber A needle valve for opening and closing each passage is provided in each Kerosene, characterized in that the needle valves are connected side by side to the float so that the needle valves open and close simultaneously in response to the movement of the gas, and a jet is interposed in the gasoline branch passage upstream of the needle valve. Engine fuel supply.