JPS5845786B2 - heating unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat generating unit that heats gas or liquid using a positive temperature coefficient thermistor element.

Conventionally, as shown in FIG. 1, a heat generating unit of this type has a barium titanate positive characteristic porcelain 1 having a large number of through holes 2. ..., 2 are provided to form a honeycomb shape, and ohmic electrodes 3 and 4 are provided on both end faces, and power is supplied to these electrodes 3 and 4 to cause the positive characteristic porcelain 1 to generate heat, and from the fan 5. The fluid to be supplied is passed through the through hole 2.
. . . A honeycomb type heater that heats by flowing water through the heater, or, although not specifically shown, a large number of thin positive characteristic porcelain plates each having electrodes on two opposing sides parallel to each other. Ladder type heaters and the like are known, which are arranged so that air or liquid is passed between them for heating.

However, in the honeycomb type heater as described above, the direction of the flow of air and the direction of the voltage applied to the positive characteristic porcelain 1 by the electrodes 3 and 4 are the same direction. The temperature distribution between is shown by curve W in Figure 2.

As shown by the curve W □, when the temperature at the intermediate part between the electrodes 3 and 4 increases, but when the fan 5 sends the wind W in the direction from the electrodes 3 to 4, as shown by the curve W □, The temperature between AB from the electrode 3 of the positive characteristic porcelain 1 through which the low-temperature wind passes to the intermediate section becomes lower than the temperature of the section between BC, and the peak temperature shifts to the exhaust section (the section between BC). I will do it.

Therefore, the resistance of the portion between BC and BC is high, and the voltage is concentrated in this portion.

A so-called pinch effect occurs, and most of the heat is generated by the BC mentioned above.
This occurs only in the area between A and B, and the area between A and B cannot make a sufficient contribution as a heat generating element, which has the disadvantage of low heat generation efficiency.

Further, as the wind speed of the wind W sent from the fan 5 increases, the resistance of the positive characteristic porcelain 1 decreases, the flowing current increases, and the amount of heat generated increases, but when the wind speed exceeds a predetermined value. When this occurs, the resistance value of the positive characteristic porcelain 1 becomes unstable around that one point, and the power consumption fluctuates periodically, so-called power oscillation occurs, and the power is sent out from the positive characteristic porcelain 1. There was a drawback that the temperature of the wind changed.

The present invention has been made in order to eliminate the above-mentioned drawbacks of conventional heat generating units. and a frame that can be disassembled and assembled and surrounds the plate-shaped PTC thermistor element and the end face of the heat radiation block, and an intervening frame is provided between the laminate of the PTC thermistor element and the heat radiation block and the frame. By fixing the above-mentioned laminate in the frame with the provided spring member, the heat generated by the positive temperature coefficient thermistor element is transmitted to the gas or liquid flowing through the through hole through the heat dissipation block, thereby increasing the positive temperature coefficient. ■ Plate-shaped positive temperature coefficient thermistor element that is easy to mold and bake, and inexpensive metal heat dissipation, which prevents pinch effects and power oscillations from occurring in the thermistor element, improves heat generation efficiency, and stabilizes temperature fluctuations. Use blocks to lower costs.

■ Simplify assembly by using a frame and spring members, ■
It is an object of the present invention to provide a heat generating unit in which a power supply terminal is integrally provided on a heat dissipation block, thereby simplifying the drawing out of lead wires.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Figures 3 and 4, 11. ..., 11 is a plate-shaped positive temperature coefficient thermistor element, 12. . . , 12 is a heat dissipation block formed into a honeycomb shape with a large number of holes 13° . is the positive temperature coefficient thermistor element 1L...

11 and heat dissipation block 121..., a frame for fixing the laminate to each other, 15 is a holding plate forming a part of the frame 14,
16 is a presser spring.

The above positive temperature coefficient thermistor element 11. ...911, for example, provides ohmic electrodes 11b and 11c on the front bag and back surface of a barium titanate-based positive characteristic porcelain plate 11a, respectively, and makes the electrode surfaces of these electrodes 11b button and 11c a heat radiation surface, respectively. It is a double-sided electrode type.

On the other hand, the heat dissipation block 12. . . , 12 are made of a metal with good thermal conductivity and electrical conductivity, such as aluminum, by die casting, for example, so that the length of the positive temperature coefficient thermistor element 11. . . . is slightly larger than twice the length of 11, and has a width of the positive temperature coefficient thermistor element 11.・・・
- Formed in a rectangular honeycomb shape with a width equal to or slightly larger than the width of 11, these heat dissipation blocks 12°..., from the center of one or both end faces of 12 are bullets (simulated jewels). shaped male terminal (hereinafter referred to as Giboshi male terminal).

) 12a protrudes. The above positive temperature coefficient thermistor element 11. ..., 11"J=- and heat dissipation block 12.
The frame body 14 for fixing the heat radiating blocks 12 is made of heat-resistant resin and molded into a roughly U-shape.・・・
. , 12 male terminals 12 a, . . . , these side plates 14 a and 1
By cutting from the upper end of 4b to near the bottom plate 14c, openings 17 and 17 are provided through which the male terminals 12a, . . . , 12a project, respectively, and these openings 17, 1
7 is the thickness of the side plates 14a and 14b.
Dig from the outside to a depth of about 2 or more,
Recesses 18 and 1B are provided.

Also, screws 19. are attached to the upper ends of the side plates 14a and 14b of the frame body 14 to attach a presser plate 15, which will be described below.・
..., 19 insertion holes 20. ..., while providing 20,
A mounting hole 21 is provided in the center of the bottom plate 14c to attach the heat generating unit to an exterior case (not shown).

), etc., is provided. The presser plate 15 is made of the same heat-resistant resin as the frame 14, and has openings 17, 17 and recesses 18, 18 provided in the side plates 14a and 14b of the frame 14, respectively, at both ends thereof. Fitting portions 15a'' and 15b having substantially the same size and shape as the shape are provided, and these fitting portions 15a''J=- and 15
screw hole 23.b into which the screw 19.19 is screwed. ...
, 23 are provided, while a mounting piece 22 provided on the frame body 14 is provided.
Similarly, a mounting piece 25 having a mounting hole 24 in the center is provided.

Next, the presser spring 16 is made by curving a rectangular plate material having spring properties such as phosphor bronze so that its cross section forms a substantially circular arc.

Among them, 26.26 is a positive temperature coefficient thermistor element 11°...
, 11 covers, these covers 26°26 are:
A heat-resistant resin similar to that of the frame body 14 and the holding plate 15 is molded into a plate shape, and a fitting having the same dimensions and shape as the fitting parts 15a and 15b provided on the holding plate 15 at both ends thereof. In addition to providing portions 26a and 26b, rectangular fitting holes 26c and 26c into which two positive temperature coefficient thermistor elements 11 and 11 are fitted are respectively provided.

Among the covers 26, 26, two positive temperature coefficient thermistor elements 11, 1 are inserted into the fitting opening 26c of the lower cover 26.
1 is fitted, the cover 26 is placed on the lowermost heat radiation block 12, and then the middle heat radiation block 12 is stacked on top of it.

Furthermore, on the heat dissipation block 12 at the intermediate stage, another cover 26 is inserted into the insertion hole 26c in the same manner as above.
The heat dissipation block 12. ..., 1
2 and a positive temperature coefficient thermistor element 11. ..., 11 laminates are formed.

The laminate has a heat dissipation block 12. ..., 12 male terminals 12a9..., 12a are connected to the side plates 14a, 1 of the frame 14.
The fitting portion 26a of the covers 26, 26 protrudes from the openings 17, 17 of the cover 4b.

26b is fitted into the frame 14 with the openings 17, 17 buttons and recesses is, is fitted.

Fitting portions 15a and 15b of the presser plate 15 are attached to the upper ends of the side plates 14a and 14b of the frame 14, and the cover 26.
26, a presser spring 16 is interposed between the iron leg support plate 15 and the uppermost heat radiation block 12 of the laminate, and screws 19. ..., 19 as the side plates 14a, 14b
The insertion holes 20, . . . 20 and the screw holes 23 of the presser plate 15. ..., it is fixed by screwing into 23.

In this way, the positive temperature coefficient thermistor element 11°...
, 11 and heat dissipation block 12. . . , 12 laminates are surrounded by a frame 14 and a presser spring 16
is biased toward the bottom plate 14c of the frame 14, and the positive temperature coefficient thermistor element 11. ..., 11 heat dissipation surfaces and heat dissipation blocks 12. . . , 12 are in close thermal and air contact with each other, and the laminate is fixed within the frame 14.

With the heat generating unit configured as described above, as shown in FIG.
Heat dissipation block 12. ..., 12 bullet male terminals 12a
, . . . A bullet female terminal 28 is press-fitted into the terminal 12a from the outside and the lead wire 27 is attached by caulking or the like.
The uppermost heat radiation block 12 and the lowermost heat radiation block 12 are connected to each other, and the same bullet female terminal 28 as described above is used to connect the middle heat radiation block 12 and the uppermost or lowermost heat radiation block 12. When a voltage is applied to each positive temperature coefficient thermistor element 11. ..., 1
1 generates heat.

Positive temperature coefficient thermistor element 11. ..., 11 is transferred to each heat dissipation block 12. ..., 12 through the through hole 13. ..., which is transmitted to the gas flowing through 13,
The flow direction is such that the positive characteristic porcelain plate 11a has electrodes 11b, 1
The temperature distribution in the thickness direction of the positive characteristic porcelain plate 11a is perpendicular to the direction of the voltage applied from 1c.
Since it is mostly affected by the temperature of the gas mentioned above, the pinch effect does not occur as in the conventional case, and the through hole 13.・
- The gas flowing through 113 is heated with high efficiency.

Moreover, the positive temperature coefficient thermistor element 11. ..., 11 is transferred to the heat dissipation block 12. . . , 12, so that even if the flow velocity of the gas increases, the positive characteristic ceramic plate 11a will not be suddenly cooled and power oscillation will not occur.

Next, in the embodiment shown in FIG.
1. ..., 11 button and heat sink 12. . . , 12, a laminate similar to that shown in FIG. , into which frames 14 and 14 as shown in FIG. 7 are fitted from both sides as will be described later.

As shown in FIG. 7, the frame body 14.14 has heat dissipation blocks 12.14 arranged in a row in the longitudinal direction. ..., 12 bullet male terminals 12a, ..., holes 29, 30 into which 12a are loosely fitted,
31. A hole 32 into which the projections 12b, 12b projecting from both end faces of the uppermost heat dissipation block 12 is fitted, and a hole 33 into which the projections 15a, 15a projecting from both ends of the presser plate 15, are fitted are provided. , at both ends, the third
As shown in the figure, a mounting piece 35. has a mounting hole 34 in the center.
There are 35.

The frame body 14.14 is mounted on the uppermost heat radiation block 12 by the repulsive force of the presser spring 16.
, 12b on the inner walls of the holes 32.
The holes 33 and 14 are brought into pressure contact with the inner walls of the holes 33 and 33, and are fitted into both sides of the laminate.

If this is done, the strength will be weaker than that shown in FIG. 3, but the final result will be the mounting hole 34 of the frame 14. ...
, 34, the heat generating unit can be assembled into a set such as an external case to securely hold the above-mentioned laminate, which not only makes it fully practical but also simplifies assembly.

Among them, the protrusion 12b of the heat dissipation block 12 at the top.

12b and the protrusions 15a, 15a of the presser plate 15 are provided with hook-shaped portions 40.40, as shown in FIG. 8a for the protrusions 15a, 15a of the presser plate 15,
4 may be prevented from coming off.

Alternatively, as shown in FIG. 8, a stopper 41 having a tongue protruding toward the center may be externally fitted onto the bullet male terminal 12a to prevent the frame 14.14 from coming off.

Even if the heat generating unit has the above configuration, substantially the same operation and effect as the heat generating unit shown in FIG. 3 can be obtained.

Although the basic embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.
Various modifications as described below are possible.

■ Giboshi male terminals 12a,..., 9th instead of 12a
As shown in the figure, a tab terminal 12a having a protrusion 36 for preventing the female terminal 28 in the shape of a leaf spring from coming off at its tip is provided in a protruding manner.

■Place the button on the heat generating unit shown in Figure 3 and screw 19.
..., use a member such as a bottle instead of 19.

(2) Porcelain is used for the frame 14, presser plate 15, cover 26, etc. instead of heat-resistant resin.

(2) A lever 42 is provided on the cover 26 as shown in FIGS.
. . . 11 is reliably positioned, and the strength is improved.

■ The cover 26 is provided with a collar 43. as shown in FIG.
43 to prevent dust etc. from entering the inside of the cover 26.

A positive temperature coefficient thermistor element 11. ..., number of 11, heat dissipation block 12. ..., also regarding the number of 12,
The present invention is not limited to the above embodiments.

In addition, in the case of the heat generating unit shown in FIG. 3, as shown in FIG. 11, the cylindrical bullet female terminals 37, . It is also possible to use two (or more) heat generating units in combination.

As is clear from the above detailed explanation, the present invention is a heat dissipation device made of a plate-shaped positive temperature coefficient thermistor element and a permanent metal with good thermal conductivity and electrical conductivity, which has a large number of through holes in the width direction. Since a spring member is interposed between the laminate with the block and the frame that can be disassembled and assembled to fix the laminate within the frame, the temperature distribution in the thickness direction of the PTC thermistor element is as follows. Since it is almost unaffected by the temperature of the gas or liquid, the pinch effect does not occur as in the conventional case, and the gas or liquid can be heated with high efficiency.

In addition, the heat generated by the PTC thermistor element is radiated through the heat radiation block, and the PTC thermistor element directly
The devices that heat the gases, etc. mentioned above take a long time, so even if the flow velocity of the gas, etc. increases, the positive temperature coefficient thermistor element will not cool down rapidly and cause power oscillations, and the above gases, etc. will be heated at a stable temperature. can be heated.

Furthermore, the present invention uses a bottom type or plate-shaped positive temperature coefficient thermistor element that is easy to fire, and also uses a metal heat dissipation block that is easy to manufacture, so the cost is lower than that of conventional ones. In comparison, it can be lowered to a much wider width, and since it uses a frame and spring members that can be disassembled and reassembled, assembly of the heat generating unit is extremely simple. Therefore, drawing out the lead wires can be made very simple.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional heat generating unit, and Figure 2 is a vertical cross-sectional view of a conventional heat generating unit.
3 is a partially sectional front view of an embodiment of the heat generating unit according to the present invention, FIG. 4 is an exploded perspective view of FIG. 3, and FIG. The figure is a perspective view of a bullet male terminal and a female terminal, FIG. 6 is a partially sectional front view of an embodiment different from that shown in FIG. 3, and FIG. Figures 8 a and b are explanatory diagrams for installing the frame body, respectively;
FIG. 9 is a perspective view of a tab terminal and a female terminal, FIGS. 10A and 10B are perspective views of modified examples of the cover, respectively, and FIG. 11 is an explanatory view when two heat generating units are combined. 11... Positive characteristic thermistor element (11a... Positive characteristic ceramic plate, 11b, 11c... Electrode), 12... Heat dissipation block (12a... Bullet male terminal), 13... Through hole, 14... Frame body, 15... Holding plate, 16...
Presser spring, 17... Opening, 27... Lead wire, 28
...Giboshi female terminal, 28...Female terminal.

Claims (1)

[Claims] 1 At least one plate-shaped positive temperature coefficient thermistor element provided with ohmic electrodes on the front and back surfaces and using these electrode surfaces as heat dissipation surfaces, and having a large number of through holes in the width direction and feeding power from the end surface in the longitudinal direction. Disassembly and assembly of a rectangular parallelepiped-shaped heat dissipation block made of metal with good electrical conductivity and a protruding terminal, and an opening for leading out the power supply terminal, surrounding the PTC thermistor element and the end face of the heat dissipation block. a spring member that presses and holds the heat dissipation block and the PTC thermistor element in a laminated state; A heat generating unit characterized in that the laminate is fixed within a frame by the spring member interposed therebetween.