JPS60237156A - Fuel heater for spark ignition kerosene engine - Google Patents

Abstract

PURPOSE:To facilitate starting without using start assisting agent by separating kerosene fuel into gas phase and liquid phase in the way of heating then contacting the liquid phase portion against the high temperature wall section of heating member and evaporating efficiently. CONSTITUTION:In a fuel heater 8 for a spark ignition kerosene engine, multi- stage ring groove 18 for producing spiral flow in the heating body 12 of fuel heater 8 for evaporating kerosene fuel at the start of a spark ignition kerosene engine is formed to separate into gas and liquid phases by utilizing said spiral flow while to contact the liquid phase portion L against the high temperature wall section 12A of the heating body 12 and evaporate. In other word, kerosene fuel will enter tangentially to the uppermost ring groove 18 and receive heat from the high temperature wall section 12A of the ring groove 18 while whirling then further whirled through a spiral groove 17 and receive heat then flow down to the groove 18. In the groove 18 lower than the fourth, the gas phase portion G is discharged through a small hole 20 to the gas path 19 while the liquid phase portion L is pushed against the high temperature wall section 12 to be evaporated thus to produce completely gasified fuel at the outlet.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention enables a spark-ignition kerosene engine to be started even at low temperatures using only kerosene fuel without using an auxiliary agent such as gasoline. This invention relates to a fuel heating device for a spark-ignition kerosene engine.

[Prior art]

Conventional spark-ignited kerosene engines use kerosene, which has low volatility and is difficult to ignite, so it is necessary to supply gasoline etc. as a starting aid when starting the engine, especially in cold regions or 0 to 15°C in winter
There was a problem in that it was impossible to start using only kerosene fuel at low temperatures.

However, if you use a starting aid such as gasoline,
A separate tank for the starting aid must be provided,
There are problems in that the equipment cost and maintenance cost are high and the operation is complicated.

[Purpose of the invention]

Therefore, the present invention solves the above-mentioned conventional problems, separates kerosene fuel into a gas phase and a liquid phase during heating, and brings the liquid phase part into contact with the high temperature wall of the heating element to efficiently generate gas. The purpose of this invention is to provide a fuel heating device for a spark-ignition kerosene engine that eliminates the need for a starting aid when starting the engine.

[Structure of the invention]

That is, the fuel heating device for a spark-ignition kerosene engine of the present invention forms a multistage ring-shaped groove capable of generating a swirling flow inside the heating body of the fuel heating device that gasifies kerosene fuel when starting the spark-ignition kerosene engine. At the same time, the swirling flow is used to separate the gas phase and the liquid phase, and the liquid phase portion is brought into contact with the high-temperature wall of the heating body and gasified.

〔Example〕

The present invention will be described in detail below with reference to the drawings. Fig. 1 is a side cross-sectional view of the main parts of the intake system of a spark-ignition kerosene engine according to an embodiment of the present invention. A spacer 7 made of a heat insulating material is interposed between the intake passage 6 and the downstream side of a carburetor 6 having a stop valve 2, a venturi 3, a nozzle 4, and a throttle valve 5 for the kerosene fuel f4F. A fuel heating device 8 is attached to the upper part of the spacer 7 via a heating device supporter 9, and when the engine is started, the fuel heating device 8 heats the kerosene fuel F, which has been sufficiently gasified, from the intake passage 6. After being supplied into the solid/da via the intake valve 10 and started, the kerosene fuel F from the carburetor 6 is used for normal operation.

Next, as shown in the side cross-sectional view of FIG.
3, an electric heater element 14, a thermistor 15, and an inflow pipe 16 for kerosene fuel F.

The heating element 12 is made of paulownia material such as copper with high thermal conductivity, and inside thereof, as shown in FIGS. 3 and 4, a multi-stage ring-shaped groove 18 capable of generating a swirling flow and connecting these grooves are provided. A large number of spiral grooves 17 are formed, and several stages of ring-shaped grooves 18 on the vaporized fuel outlet side are connected to the gas passage 1 in the center of the heating f*12.
9 are also connected through a small hole 20 or slit.

In addition, instead of forming the spiral groove 17 formed to generate a swirling flow as shown by arrow E in FIG. 3, a fixed vane capable of giving a swirling flow may be formed.

Further, the electric heater element 14 is fixed on an electric insulating/heat transfer material 16 coated on the outer periphery of the heating body 12, and is further coated with the same material, so that the energy is further dissipated to the outside. A heat insulating material 11 is attached to its outer periphery to prevent it from being damaged.

The thermistor 15 is embedded in the heating element 12 in order to detect the temperature of the heating element 12, and the inlet pipe 16 is attached in the tangential direction of the ring-shaped groove 18 of the heating element 12, as shown in FIG.

Note that 21 in FIG. 2 represents a battery, and 22 represents a temperature controller.

[For production]

In the fuel heating device of the present invention having the above configuration, the kerosene fuel F enters the uppermost ring-shaped groove 18 from the tangential direction,
While rotating, it receives heat from the high-temperature wall of the ring-shaped groove 18,
Further rotation is given by the spiral groove 17, heat is received, a part of the low boiling point component of the kerosene fuel F is gasified, the pressure rises, and the rotation speed increases while the second and third rings It flows into the shaped groove 18.

Therefore, the high boiling point components do not receive enough heat, so they form a liquid phase, and the low boiling point components gasify and form a gas phase, but due to the centrifugal force generated by the swirling flow, the liquid phase is 12, the gas phase separates toward the center and forms a ring-shaped groove 1.
8 and the spiral groove 17, and the fourth and subsequent ring-shaped grooves 18 discharge the gasified gaseous phase portion G from the small hole 20 to the waste passage 19 as shown in FIG. The phase part is heated by the centrifugal force to the high temperature wall part 12A of the heating body 12 in the external direction.
The high boiling point components are gasified from the fifth to the seventh link-shaped grooves 18 in order.
At the exit of the waste passage 19, all the fuel becomes vaporized fuel.

〔Effect of the invention〕

Therefore, in the fuel heating device of the present invention, kerosene, which is a mixture of various hydrocarbons with different boiling points, is separated into a gas phase and a liquid phase during heating (1), and the liquid phase portion is brought into contact with a high-temperature wall. It has the effect of efficiently gasifying the engine and making it easier to start the engine.

In the case of a two-stroke engine, lubricating oil is mixed into the fuel, so lubricating oil remains after all the kerosene fuel has vaporized, but in the device of the present invention, lubricating oil is removed from the spiral groove at the outlet end. It is released and does not remain inside the heating element.

1. In the device of the present invention, the surface area inside the heater can be increased to increase the heat transfer area, so the external appearance of the device can be reduced in size.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main parts of the intake system of a spark ignition kerosene engine equipped with the fuel heating device of the present invention, Fig. 2 is a side sectional view of the fuel heating device of Fig. 1, and Fig. 3 is Fig. 2 4 is a cross-sectional side view of a main part of the heating body, FIG. 4 is a plan sectional view taken along the line A-A in FIG. 3, and FIG. 5 is an enlarged side sectional view of the main part of the lower part of the heating body. 8... Fuel heating device, 12... Heating body, 12A...
High-temperature wall portion, 17... spiral groove, 18... ring-shaped groove, E
・Swirling flow, G...gas phase part, L...liquid phase part. Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Patent Attorney Kazuhiko Saishita Figure 5 Figure 4

Claims (1)

[Claims] A multi-stage ring-shaped groove that can generate a swirling flow is formed inside the heating element of the fuel heating device that gasifies kerosene fuel when starting a spark-ignition kerosene engine, and the swirling flow is used to separate the gas phase and liquid phase. A fuel heating device for a spark-ignition kerosene engine, characterized in that the liquid phase portion is brought into contact with a high-temperature wall of a heating element and gasified.