JPS6033996B2 - Intake preheating device for diesel engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake child heating device for heating intake air when starting a diesel engine in cold weather.

As an intake air preheating device for a diesel engine, a fuel outflow pipe is inserted into the intake pipe of the engine, and the fuel flowing out from the fuel outflow pipe is ignited and burned in the intake pipe, thereby converting the intake air of the engine into child heat. There is something I tried to do.

In this type of conventional intake child heating device, a heating wire is wound spirally around the outer periphery of the fuel outflow pipe, and the heat generated by the heating wire vaporizes the fuel passing through the fuel outflow pipe. The structure is such that the vaporized fuel is ignited by heating wires placed nearby. However, such a conventional preheating device has the disadvantage that manufacturing is complicated because it is necessary to electrically insulate between the fuel outflow pipe and the heating wire in order to wrap the heating wire around the outer periphery of the fuel outflow pipe. Also, if an insulating layer is interposed between the fuel outflow pipe and the heating wire, the heat conduction from the heating wire to the fuel outflow pipe will be poor, so it will take a long time for the fuel to be heated and vaporized, which will cause the engine to start. The disadvantage was that it took some time to become able to do so. SUMMARY OF THE INVENTION An object of the present invention is to provide an intake child heating device for a diesel engine that eliminates the above-mentioned drawbacks by forming a fuel outflow pipe from a heat-generating electrical resistance material and using the fuel outflow pipe itself as a part of a direct heating ignition means. It's about doing.

The present invention will be described in detail below with reference to the drawings.

The drawings show one embodiment of the present invention, and in the drawings, reference numeral 1 denotes a base 2, a neck 3 of a smaller size than the base 2 formed continuously with the base 2, and a base 2 of the neck 3. It is a tubular main body consisting of a head 4 having a larger diameter than a neck 3 and continuously formed at the opposite end. A large-diameter first hole 5 that closes at the end face of the head 4 of the tubular body 1 is formed, and a second hole 5 that extends concentrically with the first hole 5 is formed in the head 4 of the tubular body 1 . A hole 6 is formed. The second hole 6 is formed to have a smaller diameter than the first hole 5 and extends to the vicinity of the end of the neck 3 on the base 2 side. A third hole 7 is formed which extends toward zero. Third hole 7
is formed to have a smaller diameter than the second hole 6, and a cylindrical flow rate control part 8 is arranged inside this third hole 7.
Inside, a fourth hole 9 is formed which communicates with the third hole 71 from the end opposite to the capital 3. A tubular fuel outflow pipe 1 is connected to the drum.The flow control unit Muramasa connects the hole 88 opened on the second hole 6 side, the hole in the fuel outflow pipe IQ, and the hole 8D. It has a string hole 8 provided to allow the string to pass through, and the peripheral edge of the entrance end of the hole 88 on the second hole 6 side constitutes the valve seat 82.The head of the tubular body 1 The portion 4 is also provided with a through hole that extends in a direction perpendicular to the rutting direction of the second hole 6 and allows the second hole 6 to communicate with the outside. A tubular part 3 is connected to the piping from the supply source.A solenoid valve 14 is fitted in the first hole 5 of the tubular body 1. , the closed end periphery 5a of the first hole 5 is seamed so as to wrap around the periphery of the base 15 of the solenoid valve 14.The solenoid valve 14 is fixed to the base 15, and A cylindrical electromagnetic coil 16 is arranged in the same manner as the second holes 5 and 6, and a bush is disposed so as to be displaceable in the axial direction within the electromagnetic coil 16 and freely displaceable within the second hole 6 of the tubular body. The combined plunger turtle 7, the valve body turtle 8 fixed to the tip of the plunger 7 and forming a valve together with the valve seat 82, and the spring that biases the plunger 17 to press the valve body 18 against the valve seat 82. A lead wire 16a is led out from one end of the electromagnetic coil 16, and the other end of the electromagnetic coil 16 is grounded to the tubular body 1.When the electromagnetic coil 16 is excited, the plunger 17 16 , thereby causing the valve body 18 to move toward the valve seat 8 .
2 and the valve opens. Further, when the electromagnetic coil blade 6 is deenergized, the plunger 17 returns due to the biasing force of the spring 19, and the valve body 18 engages with the valve seat 82, thereby closing the valve. An electrically insulating part 20 is joined to the outer periphery of the neck part 3 of the tubular body 1, and the bent part 21a of the L-shaped conductive member 2 is connected to the electrically insulating member 281.
Therefore, it is insulated from the tubular main body 1 and is fixedly arranged.

The first terminal piece 21b of the conductive member 21 is disposed so as to protrude in the radial direction of the tubular body 1, and the second terminal piece 21c is arranged so as to pass through the through hole 22 formed in the base 2 and extend toward the outflow pipe 10. The electrically insulating material 23 provides insulation from the through hole 22 . In order to attach the device to the intake pipe 24, a head 25 having a polygonal outline, a tubular part 27 having a thread 26 on the outer periphery, and a tubular part 27 formed integrally with the tubular part 27 and having an end opening into the intake pipe 24 are used. A mounting member 29 is provided with a cylindrical body 28.
The base 2 of the tubular body vine is iron-fitted into the hole 25a provided in the head 251, and the peripheral edge of the head 25 is seamed so as to wrap around the outer periphery of the base 2. A mounting member 9 is integrated into the tubular body 1. The second terminal piece 21c of the conductive member 2i is connected to one end of a heating wire 38 that is spirally arranged so as not to contact the outer periphery of the fuel outflow pipe IQ.

The end of the heating wire 3Q extends from the tip of the opening Qa of the fuel outflow pipe and is wound spirally to form a fuel ignition part, and is connected to the vicinity of the tip of the outflow pipe 10. The fuel outflow pipe 10G is made of a heat-generating electrical resistance material such as a nickel chromium alloy, and in this embodiment, it is equivalent to the heating wire 30 and the fuel outflow pipe 10 being connected in series. Therefore, when a current is applied to the heating wire, the outflow pipe 10 itself generates heat as a heating element, and the current passing through the outflow pipe is grounded from the base 2 of the tubular body 1 through the attachment member 29 to the intake pipe 24. . The above preheating device has screws 2 of the mounting member 29.
6 into a screw hole provided in the intake pipe 24.

The first terminal piece 21b of the conductive member 21 and the lead wire 16a drawn out from the electromagnetic coil 16 are connected to the first output terminal 31a and the second output terminal 31b of the energization control circuit 31, respectively, and the energization control circuit 31 input terminal 31c
A battery 33 is connected between the terminal and ground via a switch 32. Although various circuits can be applied to the configuration of the energization control circuit 31 as necessary, it is not necessary to describe it in detail in order to understand the operation of the child heating device according to the present invention, so a detailed description thereof will be omitted. To briefly explain the operation of the device of the embodiment, first, when the switch 32 is closed, the first output terminal 3 of the control circuit 31
Current is applied from 1a to the heating wire 30 and the fuel outflow pipe 10' through the conductive member 21 serving as a terminal.

The heating wire 30 and the outflow pipe 10 start generating heat at the same time, and the outflow pipe 10 absorbs the heat generated by the heating wire 30 disposed on the outer periphery, and at the same time generates heat itself, reaching the fuel ignition temperature at a distance. When the outflow pipe 10 reaches a predetermined temperature, the control circuit 31
An exciting current is applied to the electromagnetic coil 16 from the output terminal 31b through the lead wire 16a, the plunger 17 is attracted, and the valve body 18 is separated from the valve seat 82. Fuel flows from a fuel supply source (not shown) through the through hole 11, is restricted by a peg hole 81 provided in the flow rate control member 8, and flows into the fuel outflow pipe 101. The fuel that has flowed into the outflow pipe 10 is heated and vaporized while passing through the pipe wall, and is ignited and combusted by three heating wires placed near the outlet of the outflow pipe. Start the heat. Electromagnetic coil 1
Control of energization to 6 can be performed by using a timer circuit or a temperature detection circuit, but it can of course also be performed manually. After the engine starts, combustion is stopped by closing the solenoid valve or turning off the power to the heating wire using a manual or timer circuit. According to the above embodiment, the outflow of fuel is controlled by a solenoid valve, the flow rate of fuel is appropriately adjusted by a flow rate restricting member, and the fuel outflow pipe is used as a direct heating ignition means, so that the time until the start of intake preheating is shortened. In addition to being able to significantly shorten the time, combustion can be controlled reliably.

In addition, since the heating wire is arranged in a spiral around the outer circumference of the outflow pipe, in addition to the heat generated by the outflow pipe itself, the heat generated by the heating wire can also be used to heat the outflow pipe. can be further shortened. In the above embodiment, the heating wire and the fuel outflow pipe are connected in series, but it goes without saying that the heating wire and the fuel outflow pipe may be connected in parallel. In addition, the heating wire is arranged in a spiral around the outflow pipe and then arranged near the outlet of the outflow pipe to form a fuel ignition part, but the heating wire is not used as part of the heating means and the outflow pipe is Of course, a heating wire may be placed near the outlet just for igniting the fuel. The heat-generating electrical resistance material used for the fuel outflow pipe is not limited to nickel-chromium alloys, but may be any material that has saturation resistivity with respect to temperature increases; nickel-chromium aluminum alloys, nickel-chromium iron alloys, etc. Can be used.

In the above embodiments, the present invention was applied to a device having a solenoid valve, but the present invention can be applied to any type of preheating device that heats a fuel outflow pipe to vaporize fuel.

It goes without saying that the present invention can be applied to a ball valve type heating device that has a built-in ball valve and opens and closes the valve by thermal expansion. As described above, according to the present invention, the fuel outflow pipe is made of a heat-generating electrical resistance material and serves as at least a part of the heating means, so that it is possible to significantly shorten the time until the intake child heat starts, and also to reduce the manufacturing cost. It has the advantage of being easy.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Tubular body, 8... Flow rate control part village, 10... Fuel outflow pipe, 14... Solenoid valve, 21... Conductive member, 24...Intake pipe, 30...Heating wire.

Claims (1)

[Scope of Claims] 1. An air intake preheating device for a diesel engine comprising a fuel outflow pipe and heating ignition means for heating the fuel flowing out from the fuel outflow pipe by applying electricity and igniting the fuel, wherein the fuel outflow pipe An intake air preheating device for a diesel engine, characterized in that the device is made of a heat-generating electrical resistance material and also serves as at least a part of the heating and ignition means. 2. The intake air preheating device for a diesel engine according to claim 1, wherein the heat generating electrical resistance material is an electrical resistance material having saturation characteristics with respect to temperature rise. 3. The intake air preheating device for a diesel engine according to claim 1, wherein the heating and adhesion means comprises the fuel outflow pipe and a heating wire connected in series to the fuel outflow pipe. . 4. The intake air preheating device for a diesel engine according to claim 1, wherein the heating ignition means comprises the fuel outflow pipe and a heating wire connected in parallel to the fuel outflow pipe.