JP5210066B2 - Heater device - Google Patents

Description

  The present invention relates to a heater device capable of preventing an extreme temperature drop of fuel in an internal combustion engine.

Conventionally, as this type of heater device, for example, as disclosed in Patent Document 1, a block heater that has been mounted so that a heat generating portion faces a water jacket of an engine and prevents freezing of cooling water has been proposed. Yes.
In this block heater, the power outlet at the end of the cable drawn from the heater is connected to a household power source, and the heat generating part generates heat to prevent freezing of the cooling water flowing in the water jacket.
JP 2004-257299 A

By the way, generally in cold districts, in addition to freezing of cooling water, an extreme temperature drop of fuel becomes a problem. If the temperature of the fuel falls extremely, it will adversely affect engine startability, low-temperature exhaust gas characteristics, output performance, and so on.
If a dedicated heater for heating the fuel is provided, the fuel temperature can be raised and an extreme temperature drop can be prevented, but there is a problem that the cost increases.

The heater device of the present invention aims to prevent an extreme temperature drop of the fuel with a simple structure while suppressing an increase in cost. In order to achieve at least a part of this object, the following means are adopted.
The heater device of the present invention comprises:
A block heater capable of heating oil and cooling water in the cylinder block by heating the cylinder block;
An annular pipe disposed on the cylinder block and different from the cooling water channel;
With
Said annular pipe, the internal heating medium is circulating possible filling, the portion in the fuel pipe which is arranged at a position where the upward or downward with respect to the block heater abut, another part said block The main point is that it is placed adjacent to the heater.

In the heater device of the present invention, the block heater capable of heating oil and cooling water in the cylinder block by warming the cylinder block warms the heating medium in the annular pipe , so that convection occurs in the heating medium, The fuel pipe can be warmed by the warmed heating medium.
In addition, since only the annular pipe is provided so that the heating medium can be convected, the extreme temperature of the fuel can be reduced with a simple structure while suppressing the cost increase, compared to the case where a heater or the like only for heating the fuel pipe is separately provided. A decrease can be prevented.

Further, in the heater system of the present invention, the annular piping is also assumed that the other part is disposed adjacent to the block heater to surround at least a portion of the heat generating portion of the block heater it can.
If it carries out like this, the heat from a heat-emitting part can be received efficiently.

In the heater device of the present invention, the annular pipe may be formed so as to contact along the longitudinal direction of the fuel pipe.
In this way, heat exchange between the heating medium and the fuel pipe can be performed efficiently.

In the heater device of the present invention, the annular pipe may be provided integrally with the fuel pipe.
In this way, forgetting to attach can be prevented.

Moreover, the heater apparatus of this invention WHEREIN: The said fuel pipe | tube shall be arrange | positioned above the said block heater.
By so doing, the fuel pipe can be heated earlier in time after the heating medium is warmed by the block heater than when the fuel pipe is disposed below the block heater.

In the heater device according to the present invention, the block heater may be heated by electric power supplied from an external power source.
In this way, for example, the fuel pipe is warmed up until the internal combustion engine is started, and after the start-up, the fuel pipe can be stopped from being warmed. .

Next, the best mode for carrying out the present invention will be described using examples.
FIG. 1 is a schematic configuration diagram of an internal combustion engine.
The internal combustion engine 1 includes a cylinder block 2, a cylinder head 3 attached to the top of the cylinder block 2, a cylinder head cover 4 attached to the top of the cylinder head 3, and an intake manifold connected to the intake port of the cylinder head 3. 6, a fuel pipe 7 attached to the intake manifold 6 side of the cylinder head 3, an oil pan 5 attached to the lower part of the cylinder block 2, and a heater device 20 of the embodiment attached to the cylinder block 2. .

The heater device 20 includes a block heater 9 that can be mounted in the vicinity of the water pump 8 of the cylinder block 2 and a hot water pipe 10 that is formed in an annular shape and is filled with water.
The block heater 9 is inserted into a mounting projection 2a formed to project outward from the cylinder block 2 in an integral manner.
Further, the hot water pipe 10 is fixed to the outside of the right side wall surface of the cylinder block 2 and is arranged in an annular shape so as to rise up toward the upper cylinder head 3, and the upper end side of the hot water pipe 10 contacts the fuel pipe 7. It is touched.

FIG. 2 is an enlarged configuration diagram in which the right side surfaces of the cylinder block 2 and the cylinder head 3 are enlarged.
The block heater 9 is attached to the cylinder block 2 by forming a hole in the mounting projection 2a of the cylinder block 2 and inserting the cylindrical main body 9a into the hole from the outside. Is provided with a heat generating portion 9b, and a cable 9c is pulled out from the cylindrical main body 9a to supply power to the heat generating portion 9b, and a power outlet 9d is provided at the end of the cable 9c. The power outlet 9d can be connected to an external power source such as a household power source.

  Further, the hot water pipe 10 is configured by annularly connecting a first flow path R1 on the left side in the drawing and a second flow path R2 on the right side in the drawing in FIG. 2, and a rising pipe portion constituting the first flow path R1. 10a rises from the cylinder block 2 to the cylinder head 3 side, and an enclosing tube portion 10b is formed continuously on the lower end side, and an abutting tube portion 10c extending continuously horizontally is formed on the upper end side. Further, a lower pipe portion 10d extending in a substantially horizontal direction on the lower end side of the surrounding pipe portion 10b is continuous with the second flow path R2, and the rising pipe section 10e constituting the second flow path R2 is a lower pipe portion 10d. It extends in an upward direction from the top and extends upward along the cylinder head 3, and its upper end is continuous with the horizontal contact tube portion 10 c.

Fixed flanges 11, 11, 11, and 11 are formed on the lower portions of the riser pipe portions 10a and 10e so as to integrally protrude outward in a total of four locations, and bolt holes 11a are formed in the respective fixed flanges 11. The hot water pipe 10 is fixed to the cylinder block 2 by the four fixing flanges 11, 11, 11, 11 by inserting bolts (not shown) into the bolt holes 11 a and fastening the bolts to the cylinder block 2. .
The upper portions of the rising pipe portions 10 a and 10 e rise along the right wall surface of the cylinder head 3, and the substantially horizontal abutting pipe portion 10 c at the upper end thereof abuts along the longitudinal direction of the substantially horizontal fuel pipe 7. It is joined to the fuel pipe 7 by welding or the like.
The enclosing tube portion 10b on the lower end side of the rising tube portion 10a is formed in a U-shaped curve from the left side to the right side in the drawing, and generates heat from the block heater 9 so as to surround the block heater 9. It is arranged adjacent to the portion 9b.

Next, the function and effect of such a configuration will be described.
An enclosing pipe portion 10b constituting a part of the first flow path R1 of the annular hot water pipe 10 is piped so as to surround the block heater 9 in the vicinity of the block heater 9, and the block heater 9 is energized to generate heat. When 9b generates heat, the water (medium) in the surrounding tube portion 10b is efficiently received and warmed by the heat from the heat generating portion 9b, and the warmed water forms convection and rises in the riser tube portion 10a. Flow into the contact tube portion 10c. Since the abutting pipe portion 10c is horizontally arranged along the fuel pipe 7 in a state of being in contact with the fuel pipe 7, heat exchange is efficiently performed, and the heat generating portion 9b of the block heater 9 is energized in time. The fuel pipe 7 is successfully warmed at an early stage.
Thus, the fuel pipe 7 is warmed quickly and efficiently, and the fuel in the fuel pipe 7 is warmed, so that the extreme temperature drop of the fuel in the internal combustion engine 1 is eliminated. The fuel temperature does not decrease, and the output performance of the internal combustion engine 1 is not adversely affected.

It is to be noted that the fuel pipe 7 can be efficiently warmed up until the internal combustion engine 1 is started by connecting the power outlet 9d to the household power source. After the internal combustion engine 1 is started, the power outlet 9d is connected to the household power source. Therefore, after the internal combustion engine 1 is started, the fuel pipe 7 can be prevented from warming, and the fuel pipe 7 can be prevented from being overheated during the operation of the internal combustion engine 1.
In this example, since the block heater 9 is provided in an insertion shape in the mounting projection 2a of the cylinder block 2, the cylinder block 2 is warmed by the block heater 9, and oil and cooling water in the cylinder block 2 are also removed. It is possible to warm well and improve the output performance when starting the internal combustion engine.

  Since the fuel pipe 7 is disposed above the block heater 9, convection is likely to occur in the annular hot water pipe 10. Thus, the annular hot water pipe allows water (medium) to be convected. By simply piping 10 to the outside of the side wall surface of the cylinder block 2, there is no need to separately provide a heater for heating the fuel pipe 7, and an extreme temperature drop of the fuel can be prevented with a simple structure while suppressing an increase in cost. Can do.

  In addition, in this example, although the contact pipe part 10c which comprises the hot water piping 10 is illustrated along with the fuel pipe 7 and arrange | positioned by contact etc. by welding etc., hot water piping containing the contact pipe part 10c is illustrated. 10 can also be formed integrally with the fuel pipe 7. With such a structure, it is possible to prevent forgetting to attach the hot water pipe 10 to the fuel pipe 7, and the hot water pipe 10 is connected to the cylinder block 2 or the like. It can be fixed and easily arranged.

If the hot water pipe 10 is formed in an annular shape with a contact pipe portion 10c that comes into contact with the fuel pipe 10 disposed at an upper position with respect to the block heater 9, the shape and the like are the same as those in this example. It is not limited. For example, the surrounding tube portion 10b disposed adjacent to the block heater 9 may be changed to a straddle tube portion 10f having a shape straddling the block heater 9 as shown in FIGS. The pipe 10 may be simply disposed adjacent to the block heater 9.
The hot water pipe 10 may not be filled with water.

  As mentioned above, although embodiment of this invention was described using the Example, this invention is not limited to such an Example, In the range which does not deviate from the summary of this invention, it can implement with a various form. Of course.

It is a schematic block diagram of an internal combustion engine. FIG. 2 is an enlarged configuration diagram of a main part of a right side surface of the internal combustion engine of FIG. 1. It is a schematic block diagram of the internal combustion engine which changed hot water piping. FIG. 4 is an enlarged configuration diagram of a main part of the right side surface of the internal combustion engine of FIG. 3.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder block 2a Mounting protrusion 3 Cylinder head 6 Intake manifold 7 Fuel pipe 9 Block heater (heating means)
9b Heat generating part 9c Cable 9d Power outlet 10 Hot water piping (annular member)
10a, 10e Rising pipe part 10b Enclosure pipe part 10c Contact pipe part 10d Lower pipe part 10f Crossing pipe part 11 Fixing flange 20 Heater device R1 First flow path R2 Second flow path

Claims (6)

A block heater capable of heating oil and cooling water in the cylinder block by heating the cylinder block;
An annular pipe disposed on the cylinder block and different from the cooling water channel;
With
Said annular pipe, the internal heating medium is circulating possible filling, the portion in the fuel pipe which is arranged at a position where the upward or downward with respect to the block heater abut, another part said block A heater device arranged adjacent to the heater. Said annular pipe, a heater device according to claim 1, wherein the other part is disposed adjacent to the block heater to surround at least a portion of the heat generating portion of the block heater.   The heater device according to claim 1, wherein the annular pipe is formed so as to abut along a longitudinal direction of the fuel pipe.   The heater device according to any one of claims 1 to 3, wherein the annular pipe is provided integrally with the fuel pipe.   The heater device according to any one of claims 1 to 4, wherein the fuel pipe is disposed above the block heater.   The heater device according to claim 1, wherein the block heater generates heat by electric power supplied from an external power source.

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