JPH07166962A - Emulsion fuel feeding device for engine - Google Patents

Abstract

PURPOSE:To prevent water remaining in lines from freezing and to achieve energy-saving operation by operating the engine while switching a solenoid valve so that fuel with no water mixed therein is used at the start of the engine and so that emulsion fuel is used after start-up. CONSTITUTION:At the start of an engine 17, fuel in a fuel tank 1 is fed to a vortex tube 9 via a solenoid valve 3 and a pump 10 and via another line 14. Fuel with no water mixed therein is swirled and fed to a cascade impeller 15 and introduced into the fuel injection pump of the engine 17. During steady- state operation, the solenoid valve 3 is switched using a controller 21 to cut off the fuel supply, and is connected to the gear-pump-10 side of a line 5 located on the side of a water tank 2. Water in the water tank 2 is fed into the vortex tube 9 by means of the gear pump 10 and is stirred and mixed with the fuel introduced through another line 14, so as to obtain rough emulsion fuel, which is then fed to the fuel injection pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emulsion fuel supply system for an engine used to supply an emulsion fuel consisting of light oil and water to the engine.

[0002]

2. Description of the Related Art Conventionally, in order to reduce nitrogen oxides in exhaust gas of a diesel engine, various emulsion fuel supply devices have been proposed for supplying an emulsion fuel composed of light oil and water to the engine for injection and combustion. ing.

The first is to inject water in a mist state at the intake manifold of the engine, and at the same time suck fuel into the cylinder. The second is to mix light oil and water in advance. The emulsion fuel is prepared and directly injected into the cylinder by the fuel injection pump.

The third is a method called EGR, in which the flame speed is reduced by reusing the exhaust gas to reduce the amount of fresh intake air, thereby reducing the emission amount of nitrogen oxides in the exhaust gas. The fourth is that the light oil and water are mixed just before the engine and introduced into the cylinder.

[0005]

However, in the conventional fuel supply device of the first type, water is required in the same amount as the fuel, and this increase in water causes an increase in the amount of black smoke in the exhaust gas. In the second fuel supply device, it is necessary to prepare and prepare emulsion fuel at a gas station in advance, and the problem that gas oil and water are phase-separated with time. was there.

Further, the third fuel supply device has a problem that the amount of smoke increases at high load and nitrogen oxides cannot be reduced, and the fourth fuel supply device has a problem in that the above-mentioned emulsion fuel is used. Although there is no problem of phase separation, water accumulates in the pipe from the water supply valve to the stirring part (mixer) between light oil and water, causing rust in the pipe and stirring part, as well as in these pipes at low temperatures. In addition, there are problems that freezing occurs in the stirring section, making it impossible to produce emulsion fuel and damaging the stirring section.

The present invention has been made by paying attention to the above-mentioned conventional problems. By controlling the load according to the amount of water added, the generation of nitrogen oxides can be suppressed while suppressing the generation of black smoke. To provide an emulsion fuel supply device for an engine, which can reduce the fuel consumption, can supply the emulsion fuel without phase separation to the engine by the stirring action of the cascade impeller, can smoothly start the engine, and can realize the operation with energy saving. To aim.

[0008]

SUMMARY OF THE INVENTION An emulsion fuel supply system for an engine according to the present invention receives an electromagnetic valve for switching and supplying either fuel or water, and receives fuel or water from the electromagnetic valve via a gap pump, A vortex tube for rotating these with a fuel supplied from another system to make a crude emulsion fuel is provided, and the cascade impeller is agitated with the crude emulsion fuel from the vortex tube to generate a fine emulsion fuel, A gas is supplied to an engine fuel injection pump, and a motor drives the gap pump together with the cascade impeller or independently of the cascade impeller so that a water addition rate determined based on the load state of the engine is obtained. It was done.

[0009]

In the emulsion fuel supply system for an engine according to the present invention, the engine is started only by the fuel containing no water by switching the solenoid valve, and after the start, the operation of the engine by the emulsion fuel is continued and before the stop. Enables operation without water contamination to avoid freezing of residual water in the pipeline during suspension.

Further, by controlling the operation of the gear pump by a DC motor or the like according to the water addition rate, it becomes possible to perform an energy saving operation of the engine.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a fuel tank for containing fuel such as light oil, which has a filter for fuel filtration.

Reference numeral 2 is a water tank for containing water, which has a level sensor, a drain valve, and the like.

Reference numeral 3 designates a solenoid valve as a 3-way solenoid valve for switching the fuel supplied from the fuel tank 1 through the pipe 4 or the water supplied from the water tank 2 through the pipe 5 to the pipe 6; Reference numeral 7 is a check valve placed in the middle of each of the pipes 4 and 5, and reference numeral 8 is a drain valve for draining water from the pipe 5.

Further, 9 is a vortex tube having a tapered portion for forming a vortex connected to the outlet side of the solenoid valve 3 via a gap pump 10, and mixing and stirring the fuel and water to form a crude emulsion. Produces fuel.

Reference numeral 11 is a relief valve provided in the pipe 12 that bypasses the gap pump 10.

Further, the above-mentioned check valve 6 is provided in the pipe 4.
A fuel pipe 14 of another system, which is connected to an oval gamma meter 13 having a fuel flow rate sensor on the downstream side of the pipe.
Is connected to one end, and the other end of the pipe 14 is connected to the vortex tube 9.

Further, 15 is a cascade impeller connected to the lower end side of the vortex tube 9, and the crude emulsion fuel obtained from the vortex tube 9 is stirred at high speed and efficiently to produce a fine emulsion fuel. It is a thing.

Reference numeral 16 is a cascade impeller 15
Reference numeral 18 denotes a pipe for guiding the emulsion fuel generated in (1) to the fuel injection pump of the engine 17, and 18 for guiding the fuel overflowing from the fuel injection pump to the vortex tube 9.

Further, 19 is a single DC motor which is a motor for simultaneously driving the cascade impeller 15 and the gear pump 10 on the same axis via the transmission 20.
Is a controller for pulse-controlling the DC motor 19 based on the load state information including the output of the flow rate sensor and the output of the potentiometer for detecting the accelerator petal displacement.

Next, the operation will be described. First, when the engine 17 is started, the solenoid valve 3 is switched to the state shown in FIG. 1 under the control of the controller 21, for example.

Therefore, the fuel in the fuel tank 1 is supplied to the pipe 4
Also, the fuel is supplied to the vortex tube 9 via the solenoid valve 3 and the gear pump 10, and the fuel is supplied to the vortex tube 9 via the pipe 14 of another system via the oval gauge 13.

As a result, from the vortex tube 9, only fuel that does not contain water is vortex-rotated and sent to the cascade impeller 15, and is further guided to the fuel injection pump of the engine 17 through the pipe 16.

Therefore, the engine 17 can receive the fuel only, ignite it, and explode it to start the engine 17.

On the other hand, when the engine 17 is started and enters the steady operation, the solenoid valve 3 is switched, for example, under the control of the controller 21, and the fuel supply from the pipe 4 is cut off, while The pipe 5 on the water tank 2 side is connected to the gap pump 10 side.

Therefore, the water in the water tank 2 is supplied into the vortex tube 9 by the gap pump 10 via the check valve 7.

On the other hand, in this vortex tube,
Since the fuel is always introduced from the fuel tank 1 through the separate system pipe 14, the water and the fuel are agitated in the vortex tube 9 to produce the crude emulsion fuel.

The crude emulsion fuel thus produced is introduced into the cascade impeller 15, where it is stirred and mixed with high efficiency by high-speed rotation to be a high-quality emulsion fuel without phase separation. It is guided to the fuel injection pump of the engine 17 through the pipe 16 and burned in the cylinder to generate power.

In this way, by continuing the operation of the engine 17, the local high temperature part generated by the fuel of the solid carbon due to the gasification and combustion is eliminated, so that the production amount of nitrogen oxide can be reduced. It is possible to purify exhaust gas and improve engine output by suppressing the remaining carbon.

On the other hand, when the engine 17 is stopped, before the stop, the solenoid valve 3 is switched under the control of the controller 21 or manually to shut off the supply of water to the gas pump 10, and the emulsion fuel is used up. After that, only the fuel is introduced from the fuel tank into the gas pump 10, and the operation of the engine is stopped after the introduction is completed.

In this way, it is possible to avoid freezing of water between the gear pump 10 and the solenoid valve 3 and the occurrence of an accident associated therewith while the engine 17 is stopped in a cold region, etc., and to arrange the piping, the gear pump 10, and the cascade. Rust generation in the impeller 15 can be avoided.

In this embodiment, the water in the pipe 5 is discharged by opening the drain valve 8 and the water in the water tank 2 is discharged by opening the internal drain valve (not shown). Is desirable.

As described above, when the engine is stopped, only the fuel containing no water is filled in the pipes after the solenoid valve 3, so that the starting operation which is the subsequent cranking can be smoothly started.

Further, in the present invention, the control of the gear pump 10 is performed by the rotation control of the DC motor based on each output information according to the load such as the flow rate sensor for fuel and the potentiometer for detecting the accelerator petal displacement. Therefore, the desired water addition rate (mixing ratio of water and fuel)
Thus, the operation of the gap pump 10 can be performed efficiently and with energy saving.

When the fuel sent to the fuel injection pump overflows, it is guided to the vortex tube 9 for reuse and is not returned to the fuel tank 1 by the check valve 6.

Further, in the above, since the gear pump 10 and the cascade impeller 15 are driven by one DC motor 19, there is an advantage that the system is small and lightweight and the cost is low.

FIG. 2 shows another embodiment of the present invention,
This embodiment is different from the above embodiment in that the cascade impeller 15 is independent of the gear pump 10 and is driven at a high speed by a direct current motor 30 as its own motor.

That is, by independently rotating the cascade impeller 15 by the DC motor 30 at high speed, the emulsion of the fuel, which is light oil, and water can be further miniaturized. In addition to greatly reducing the generation of rust, it is possible to reduce the generation of rust on the piping and various parts (not shown) through which water passes.

Therefore, the life of the entire system is extended.

On the other hand, the gas pump 10 that determines the water addition rate increases in proportion to the rotation speed of the original DC motor 19,
By controlling the number of revolutions of the DC motor by the output pulse of the pulse generator, it is possible to obtain an appropriate mixing ratio of water and fuel.

[0040]

As described above, according to the present invention, a solenoid valve for switching and supplying either fuel or water, and fuel or water from the solenoid valve is received via a gap pump, and these are supplied from a separate system. A vortex tube that rotates in vortex with the supplied fuel to produce a crude emulsion fuel is provided, and the cascade impeller agitates the crude emulsion fuel from the vortex tube to generate a fine emulsion fuel, and a fuel injection pump for the engine. In order to obtain the water addition rate determined based on the load condition of the engine, the motor is configured to drive the gap pump together with the cascade impeller or independently of the cascade impeller.
By controlling the load according to the amount of water added, it is possible to reduce the generation of nitrogen oxides while suppressing the generation of the above black smoke, and it is possible to supply emulsion fuel without phase separation to the engine by the stirring action of the cascade impeller and Smooth start-up and energy-saving operation.

[Brief description of drawings]

FIG. 1 is a system diagram showing an emulsion fuel supply system for an engine according to an embodiment of the present invention.

FIG. 2 is a system diagram showing an emulsion fuel supply system for an engine according to another embodiment of the present invention.

[Explanation of symbols]

 3 Solenoid valve 9 Vortex tube 10 Gapump 15 Cascade impeller 17 Engine 19,30 Motor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area F02M 25/00 T 37/00 341 H

Claims (1)

[Claims] 1. A crude emulsion which receives a fuel or water from the solenoid valve through a gap pump and which switches and supplies either fuel or water, and vortex-rotates them together with fuel supplied from another system. A vortex tube as a fuel and a crude emulsion fuel from the vortex tube are stirred to produce a fine emulsion fuel,
A cascade impeller that supplies a fuel injection pump of an engine, and a motor that drives the gap pump together with the cascade impeller or independently of the cascade impeller so that a water addition rate determined based on a load state of the engine is obtained. An emulsion fuel supply device for an engine, which comprises: