JPH0267453A - Fuel supply system for kerosene engine - Google Patents

Abstract

PURPOSE:To make fluidity better in mixing gasoline in kerosene and thereby perform good suction through intake negative pressure by opening a shut-off cock, feeding a kerosene chamber with the gasoline at the time of a drop in the fluidity of the kerosene at low temperature or the like, and having the mixed fuel of the gasoline and the kerosene drawn out. CONSTITUTION:A needle valve 16 for gasoline is parallelly installed in a kerosene system needle valve 14 being opened or closed by a flow 13 in a kerosene chamber 15 at a carburetor body. Then, a kerosene feeding passage 17 and a gasoline feeding passage 18 are connected to each of valve seats 14B, 16B. When temperature is low and there is some problem on fluidity in kerosene, by way of example, a shut-off cock 23 is turned to ON. In this case, the gasoline also is made to flow in a branch passage 21, and then fed to the inside of the kerosene chamber 15 by way of the gasoline feeding passage 18, a jet 19 and the needle valve 16. With this constitution, viscosity of the mixed kerosene and gasoline is decreased to the desired degree.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention relates to a kerosene engine, and in particular, when the fluidity of kerosene decreases, gasoline is mixed with kerosene and the mixture is supplied to the engine. Regarding a fuel supply device.

(Prior art) In internal combustion engines used in outboard motors, kerosene,
Among these, some engines use white kerosene.

The carburetor of an internal combustion engine that uses kerosene (hereinafter referred to as a kerosene engine) is equipped with a kerosene supply system and a gasoline supply system.When starting, it supplies gasoline and sends the mixture to the engine, and after starting, it switches to the kerosene mixture to start the engine. It is designed to supply

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

Further, kerosene is pumped up from a kerosene tank (KT) by a kerosene pump 12, passes through a needle valve 14 that is opened and closed by a float 13, flows as indicated by a dotted arrow, and is sent to a kerosene chamber 15 in the carburetor body 1.

As a result, at the time of starting, gasoline is sucked out from the gasoline chamber 11 to the gasoline nozzle 3 by the negative and positive intake air to create a gasoline mixture CG), and fuel is supplied as a pilot and slow system. Kerosene slow nozzle, main nozzle 5.7
Kerosene is sucked out to create a kerosene mixture (K), and the
Fuel is supplied as the main system.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional fuel supply device, since kerosene has a higher viscosity than gasoline, when it gets low temperature, it is likely to be sucked up through the main and slow system passages due to viscous resistance. There were problems such as poor connection from slow to main and engine stalling.

In view of this, the present invention has been made for the purpose of providing a fuel supply system for a kerosene engine that improves the malfunction of the engine when the fluidity of kerosene is reduced, such as at low temperatures.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the problems of the prior art described above, the present invention provides a branch passage that branches from a passage that supplies gasoline from a gasoline pump to a gasoline chamber of a carburetor and communicates with a kerosene chamber of a carburetor. A switching cock is provided at the branch part of this branch passage, and when the fluidity of kerosene decreases at low temperatures, the switching cock is opened to supply gasoline to the kerosene chamber and suck out the mixed fuel of gasoline and kerosene. It is characterized by the following.

(Function) When the fluidity of kerosene decreases, by opening the switching cock, gasoline from the gasoline pump is supplied into the kerosene chamber of the carburetor, and gasoline is mixed with kerosene in the chamber to improve fluidity. The air-fuel mixture is better sucked up by the intake negative pressure, and the air-fuel mixture can be supplied to the engine. When sufficient fluidity is obtained with only kerosene, closing the switching cock cuts off the supply of gasoline to the kerosene chamber, and only kerosene is supplied, and the kerosene mixture is supplied to the engine.

(Example) Hereinafter, a third example of the present invention shown in FIGS. 1 and 2 will be described.
This will be explained in conjunction with the illustrated carburetor.

Float 13 in the kerosene chamber 15 of the carburetor body 1
A needle valve 16 for gasoline is installed in parallel with the needle valve 14 of the kerosene supply system, which is opened and closed by the needle valve 14, and the needle valves 14A and 16A of these needle valves 14.
B, 16B are closed. 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 branch 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 the chain line in FIG. A switching cock 23 is provided in the section 22 . This switching cock 23 has an OFF position and an ON position as illustrated in FIG. 2. When it is turned ON, the passage 20 and the branch passage 21 are communicated with each other, and when it is set to the OFF position, it is closed to the branch passage 21. It is formed like this.

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

When the temperature is high and there is no problem with the fluidity of kerosene, the switching cock 23 is turned off. As a result, gasoline does not flow into the kerosene chamber 15, and 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 fluidity of kerosene, the switching cock 23 is turned on. Then, gasoline from the gasoline pump 8 also flows into the branch passage 21, and is supplied into the kerosene chamber 15 via the gasoline supply passage 18, the jet 19, and the needle valve 16.
The viscosity of the kerosene and gasoline mixed inside is moderately reduced,
It has improved fluidity and can be sucked up without interruption due to negative intake pressure. In this case, the mixing ratio of gasoline and kerosene can be changed by selecting the jet 19,
The minimum amount of gasoline required can be used.

〔Effect of the invention〕

As explained above, according to the present invention, gasoline can be mixed with kerosene and supplied at any time when the flowability of kerosene is poor, thereby eliminating problems such as slow-to-main connection and engine stalling caused by poor flow of kerosene. Therefore, the kerosene engine can be operated smoothly even at low temperatures, and the market for kerosene engines can be expanded. In addition, since gasoline can be supplied and stopped by one-touch operation of the switching cock, it is easy to handle, and by adjusting the gasoline flow rate, there are various effects such as minimizing gasoline consumption.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a partial cross-section of the essential parts of an embodiment of the fuel supply system for a kerosene engine according to the present invention, Fig. 2 is a plan view of the switching cock portion, and Fig. 3 is an explanatory diagram to which the present invention is applied. 1 is a perspective view, partially in section, showing a carburetor of a kerosene engine. 1...Carburetor body, 2...Intake passage, 11...
- Gunlin chamber, 14... Kerosene needle valve, 15... Kerosene chamber, 16... Gasoline needle valve, 21... Branch passage, 23... Switching cock. Applicant's agent Mr. Sato Figure 2

Claims (1)

[Claims] A branch passage is formed that branches off from the passage that supplies gasoline from the gasoline pump to the gasoline chamber of the carburetor and communicates with the kerosene chamber of the carburetor, and a switching cock is provided at the branch part of this branch passage to control the flow of kerosene at low temperatures. 1. A fuel supply device for a kerosene engine, characterized in that a switching cock is opened to supply gasoline to a kerosene chamber when the oil pressure deteriorates, and a mixed fuel of gasoline and kerosene is sucked out.