JPS5943694B2 - intake air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rapid heating type intake air heater used in a diesel engine, and its purpose is to raise air taken into the diesel engine in an extremely short time. It is something to do.

As is well known, diesel engines require the intake of high-temperature air when starting at low temperatures, so a heater with a heater wire is placed in the air passage to the engine. .

The L heater has a short cylindrical frame in which a single strip heater wire is bent several times in a position parallel to the axial direction of the frame, and the heater wire is bent back and forth. Air is circulated through the gap to raise the temperature to a desired temperature and is then sucked into the engine (see Figure 1a).

However, since the temperature of the heater wire rises to about 1,000°C, the heater wire 1 itself expands and deforms due to the heat in the state shown in Figure 1a, resulting in a single heater wire arranged reciprocally as shown in Figure 2. There have been many cases in which 1 and 1 have come into contact with each other and short-circuited 6, so as shown in Fig. Conventionally, a wave-shaped plate spring 3 is arranged on the inner wall surface 2, and the plate spring 3 and the bent part of the heater wire 1 are brought into contact with each other via a cushioning material 4. It is taken.

That is, if the heater wire 1 is elongated and deformed in the direction of the arrow due to heat, the leaf spring 3 is deflected and deformed in the direction of the inner wall surface 2, causing
This is intended to prevent deflection due to the elongation of the tar wire 1.

By the way, it is desirable to make the bending interval of the heater wire 1 as small as possible to increase the number of reciprocations and to increase the contact area with the air. good.

However, in the configuration as shown in FIG. 1C, the extended heater wire 1 presses the leaf spring 3, so the heater wire 1 needs to have enough rigidity and must be thicker.

In other words, the leaf spring 3 must be strong enough not to be impinged by engine vibrations (and weak enough not to press too much on the heater wire 1 and cause it to bend as shown in Figure 1). is requested, while 2 for heater wire 1
Therefore, the plate spring 30 is required to have enough strength to resist the elasticity and expand without bending.

However, it is extremely difficult to select and adjust the L-distribution spring 3, and in order to add the above-mentioned rigidity to the heater wire 1, it has to be thick, so there is no hope of making the heater wire 1 as thin as possible. I wasn't satisfied.

The present invention was devised to eliminate the above-mentioned conventional drawbacks and inconveniences, and uses a tensioning mechanism to prevent the heater wire 1 from being bent due to elongation and deformation due to heat.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 shows an embodiment of the present invention, with reference numeral 10.
is a short cylindrical frame, and is composed of a -L wall 11, a lower wall 12, and both side walls 13 and 13.

Groove frames 14, 14, which are open at the top, protrude along the axial direction of the frame body 10, are provided on the upper portions of the inner surfaces of the side walls 13, 13, and groove frames 14, 14 are provided on the lower portions of the inner surfaces of the side walls 13, 13, and the groove frames 14, 14 are opened upwardly. Groove frames 15, 15 with openings 11 are similarly provided protruding 3.Next, reference numeral 16 is a thin frame-shaped connecting rod, which is molded from ceramic such as glass. The rod 16 is attached to the upper wall 1
1 or the inner wall surface of the lower wall 12 and a predetermined distance from each other.
4, 14, or 2 located in the gap between the F wall 12 and the -F section groove frames 15, 15, and this connecting rod 16 has the frame 1
The pins 17 are arranged in parallel with a certain gap in the direction of the 00 axis and in a downward position, and the bin group 18 is composed of j- (
1° Also [partial groove frames 14, 14 and lower groove frames 15, 15
Spring coils are arranged as elastic members 19 in each of the inner and outer walls, and the tips of the elastic members 19 abut against both ends F of the connecting rod 16 located between the upper groove frame 14 and the upper wall 11. ~
Therefore, the -1 part 17 group 18 is constantly pushed up toward the upper wall 11, or the bullet 19 in the lower groove frame 15 is pushed up against the F part bottle group 1.
8 is constantly pushed down in the direction of the lower wall 12 in the same way.

Next, reference numeral 20 denotes a long strip-like sawtooth wire, both ends of which are connected to terminals 21 provided on both side walls 13 and 13 of the frame 100.
line 20, the pair of upper pin group 18 and lower pin group 18;
One heater wire 20 is stretched across the pins 17 alternately in a reciprocating manner, and stretched in a bent manner through the pins 17 through the intermediary 1-. The mutual spacing between the bins 17 is the same as the mutual spacing between the bins 17 arranged on each connecting rod 16.

The above-mentioned heater wire 20 is tensioned to the extent that it does not become loose and short-circuited.
However, since both bottle groups is and is are pressed in the direction of the upper wall 11 (* is the direction of the lower wall 12) through the bullet 19, that is, in the direction that is always opposite to each other, the above-mentioned Tension is constantly applied to the heating wire 20 by a tensioning mechanism composed of the elastic member 19 and the connecting rod 16.

Incidentally, in the above embodiment, a pair of bin groups 18°180
The structure was such that bullets 19 were placed on both sides, but one bottle group 1
A bullet material 19 is placed only in the bottle group 8, and the other bottle group 18 is placed in the frame 10.
It can also be configured to be fixed inside (゛.

Further, as can be understood from FIG. 2, in the illustrated embodiment,
It has a structure in which two heater wires 20 are respectively spanned through the bottle group 18 within the frame.

Next, in the embodiment shown in FIG. 3, a plate spring is used as the elastic member 19 in the tensioning configuration, and the bottle group 20 is pulled in the direction of the inner wall surface of the frame 10.

That is, here, a flat crosspiece 22 is used instead of the groove frame in the previous embodiment.
is protruded parallel to the I-axis direction of the frame 10, and the bottle group 1
8 is this crosspiece 2 at a predetermined distance from the inner wall surface of the upper wall 11.
The connecting rod 16 is held in such a manner that both ends thereof are placed on top of the connecting rod 2.

In addition, a through hole 23 is drilled in the center of the upper wall, into which a short pin 24 is irremovably fitted. A spring is held and located in the similar bottle 24 6. This leaf spring-like elastic material 19 has a shape perpendicular to the axial direction of the frame 10 and has the property that both ends elastically return toward the earth wall. Further, both ends thereof are bent and fixed to both ends of the connecting rod 16 of the bottle group 18.

Therefore, the bottle group 18 is constantly being pulled toward the upper wall 11 by the elastic restoring force of the elastic member 19.

Although the illustrated example shows only the lower wall 11, it is naturally possible to provide a similar mechanism to the lower wall 12.

Next, in the embodiment shown in FIG. 4, the elastic material 1 in the tension mechanism
Similarly, a plate spring is used as 9, and the pin group 18 is pushed toward the inner wall surface of the frame body 10.

That is, a crosspiece 22 similar to that of the embodiment shown in FIG.
A plate spring-like elastic material 19 having a resilient force toward the inner wall surface of the upper wall 11 is disposed on the upper wall 11. Raise pin group 18
will be arranged.

Therefore, with the heater wire 20 stretched across, pin group 1
8 is constantly pushed upward by the elasticity of the bullet 19, and a desired tension is applied to the heater wire 20.

Further, as in the previous embodiment, the mechanism described in "2" may be provided near the lower wall 12.

Next, in the embodiment shown in FIG. 5, the elastic member 19 of the tension mechanism is attached to a part of the frame 10, and
7 are individually pushed toward the inner wall surface of the frame 10 via a bullet 19.

In other words, both side walls 13° 13 which are the upper parts of both opening ends of the frame 10
A pair of flat support plates 25.25 made of a highly elastic steel plate or the like are attached between them, and each support plate 25.2
5 Make cuts at equal intervals on the upper end, and bend every other tongue piece formed by the cuts inward to make the elastic material 1.
form 9.

Then, both ends of each bottle 1 are placed on each of the bent tongue-shaped elastic members 19 between the support plates 25 and 25 at a predetermined distance from the inner wall surface of the upper wall 11. be.

Therefore, when the heater wire 20 is passed around each pin 17 in this configuration, each pin 17 is pushed toward the inner wall surface of the upper wall 11 by the elasticity of the respective elastic material 19, so that the heater wire 20
The desired tensicon lj is added to 0.

It should be noted that the support plate 25 may also be disposed near the lower wall 12 to apply elastic force to the lower pin group 18.

The present invention has the configuration as described above.

Therefore, the pair of pin groups 18, each of which has a heater wire 20 stretched, is moved in opposite directions, which are the inner wall of the upper wall 11 of the frame 10 or the wall surface of the lower wall 12, by the action of the elastic material 19 in the tension mechanism. An acting force is always applied, and accordingly, the heater line 20 extending between the pair of bottle groups 18 is also always applied with tension.

As a result, even if the heater wire 20 generates heat and expands, the pin group 18 is displaced by the tension mechanism, so that the tension state of the heater wire 20 is always maintained.

Then, the pin group 18 and the inner wall surface of the upper wall 11, or the pin group 18
Since a predetermined gap is previously formed between the inner wall surface of the lower wall 12 and the inner wall surface of the lower wall 12, even if the heater wire 20 extends and the pin group 20 is displaced, the pin group 18 will not collide with the inner wall surface. There is no possibility that the heater wire 20 becomes slack.

As is clear from the above description, the intake air heater of the present invention has a simple structure, is almost the same as a conventional frame, and has a structure in which members protrude outside. Therefore, it is easy to attach it to the air passage, and since the heater wire 20, which expands due to heat, can always be kept under tension, the heater wire 20 will not slack and cause a short circuit. heater wire 2
Since the tension of 0 is applied via the elastic material 19 of the tension mechanism, the heater wire 20 can be made extremely thin as long as it has enough strength to resist this tension, and as a result, the Since heat can be effectively transferred to the air passing between the heated heater wires 20 and there is a large contact area with the air, high temperature air can be obtained in a short time, and the starting time of the tasel engine is extremely short. It has many excellent effects, such as being achievable within a short period of time.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a deformed state of a conventional heater wire. FIG. 2 shows one embodiment of the present invention, in which a is a front view and b is a sectional view taken along the line B--B at a. Figure 3 shows another embodiment, where a is a front view and b is a front view.
is a central sectional view. FIG. 4 shows still another embodiment, in which a is a front view and b is a sectional view. FIG. 5 is a partially sectional perspective view showing another embodiment. Explanation of symbols, 10... Frame, 11...
North wall, 12... lower wall, 13... side wall,
14, 15...Groove frame, 16...Connecting rod, 17...Pin, 18. ...Pin group, 1
9...Bullet material, 2o...Heater wire, 2
1... terminal, 22... crosspiece, 23...
...Through hole, 24...Short pin, 25...
...Support plate.

Claims (1)

[Scope of Claims] 1. A pair of bin groups in which bottles parallel to the axial direction of a short cylindrical frame are arranged in parallel at a certain interval are arranged in oppositely facing sides of the frame. A belt-shaped heater wire is placed between the pair of bins at a desired distance from the wall surface, and stretched between the pair of bins, and is stretched alternately over each of the bins. , an intake air heater equipped with a tension mechanism that always applies elasticity in opposite directions using an elastic material. 2. The tension mechanism includes a connecting rod to which a large number of bottles constituting the bottle group are fixed, and a spring coil-shaped elastic material that comes into elastic contact with both ends of the connecting rod and constantly presses the connecting rod toward the inner wall surface of the frame. The intake air heater 333 according to claim 1, which is configured by a connecting rod to which a number of bottles constituting a pin group are fixed, and both ends of which are attached to both ends of the connecting rod. 2. The intake air heater according to claim 1, further comprising a leaf spring-like elastic member whose central portion is attached to a wall of the frame and which constantly pulls the connecting rod toward the inner wall surface of the frame.