JPS5845789B2 - 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 or the like with a large number of through holes 2. . . . 2 is provided and formed into a square shape, and ohmic electrodes 3 and 4 are provided on both end faces,
By supplying power to these electrodes 3 and 4, the positive characteristic porcelain 1
generates heat, and the fan 5 also sends air to the through hole 2.
．． . . . A non-nicam type heater that heats by flowing current through the 2, or a large number of thin positive characteristic porcelain plates each having an electrode on two opposing circumferential surfaces, although not specifically shown. Ladder type heaters are known in which heaters are arranged parallel to each other and air or liquid is passed between them for heating.

However, in the above-mentioned type heater, etc., 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.
The temperature distribution in the middle part between electrodes 3 and 4 is the same as that in the case of no wind.
Curve W is shown in the figure.

As shown by curve W1, there is a peak temperature in the middle between electrodes 3 and 4, but when the fan 5 sends wind W in the direction toward electrodes 3 and 4, as shown by curve W1,
As for the electrode 3 of the positive characteristic porcelain 1 through which low-temperature wind passes, the temperature of the part between AB leading to the above-mentioned intermediate part is lower than the temperature of the other part between BC, and the peak temperature is at the exhaust part (between BC). (part).

Therefore, the so-called pinch effect occurs in which the resistance of the part between BC increases and the voltage concentrates in that part, and most of the heat generation occurs only in the part between BC and the part between AB. Since it does not make a sufficient contribution as a body, there is a drawback that the overall heat generation efficiency is low.

Furthermore, as the speed of the wind W fed by the fan 5 increases, the resistance of the positive characteristic porcelain 1 decreases, the flowing current increases, and the amount of heat generated increases; however, the wind speed exceeds a predetermined value. Then, the resistance value of the positive characteristic porcelain 1 becomes unstable before and after that point, and the power consumption periodically fluctuates, so-called power oscillation occurs, and the positive characteristic porcelain 1 is also affected by the wind that is sent out. There was a drawback that the temperature changed.

The present invention has been made in order to eliminate the above-mentioned drawbacks of conventional heat generating units, and the present invention has been made to solve the above-mentioned drawbacks of conventional heat generating units. The clamping member protrudes and the tabs are tightened together through the spacer portion of the insulating spacer, and the clamping tab is a connecting member that attaches the component so that the tabs do not conduct to each other. By fixing the heat radiation blocks to each other at the ears with the positive temperature coefficient thermistor element and the heat radiation block stacked alternately, the heat generated by the positive temperature coefficient thermistor element flows through the through hole through the heat radiation block. A plate-shaped material that is easy to mold and fire, which transmits electricity to gas or liquid, preventing pinch effects and power vibrations from occurring in PTC thermistor elements, improving heat generation efficiency and stabilizing temperature fluctuations. □Reducing costs by using a star element and an inexpensive heat radiation block made of metal. ■Providing ears on the heat radiation block and fixing the heat radiation blocks to each other using a connecting member that also serves as a mounting member for attaching to an external case, etc. The object of the present invention is to provide a heat generating unit in which assembly is simplified in this manner; (1) a power supply terminal is integrally provided on a heat dissipation block to simplify drawing out of lead wires;

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

(1) In FIGS. 3 and 4 of the first embodiment, 11. ..., 11 is a plate-shaped positive temperature coefficient thermistor element, 12a, 12b.

12c has a hexagonal shape in the thickness direction (it may also have other shapes such as a triangle or a quadrangle).

) numerous holes 13. .... Heat dissipation blocks 13 and formed in a honeycomb shape, 14, .

15.15 Connecting member that also serves as a mounting member attached to )
is an insulating spacer.

The above positive temperature coefficient thermistor element 11. . . , 11 is, for example, provided with ohmic electrodes 11b and 11c on the front and back surfaces of a barium titanate-based positive characteristic ceramic plate 11a, respectively, and uses the electrode surfaces of these electrodes 11b and 11c as heat radiation surfaces, respectively. It is a double-sided electrode type.

On the other hand, the heat dissipation blocks 12a, 12b, and 12c are all made of a metal with good thermal conductivity and electrical conductivity, such as aluminum, by die-casting, and the length thereof is the same as that of the positive temperature coefficient thermistor elements 11°..., 11. length of 2
It is slightly larger and thicker than the positive temperature coefficient thermistor element 11. ..., equivalent to the width of 11 or slightly X
It is formed into a large rectangular honeycomb shape.

The heat dissipation blocks 12a, 12b, and 12e are provided with power supply terminals 16 in the shape of burls (pseudo jewels) on both end faces in the longitudinal direction.
．． . . , 16 are provided protrudingly provided, and ears 17, 17 are provided from the lower ends of the above-mentioned both end faces of the upper heat radiation block 12a, and ears 17, 17 are provided from the upper end and lower end of the above-mentioned both end faces of the middle heat radiation block 12b, respectively. ears 18a, 18b and tabs,
18b, and ears 19, 19 protrude from the upper portions of both end surfaces of the lower heat dissipation block 12e, respectively.

In addition, in the above-mentioned three heat radiation blocks 12a, 12b and 12c, the upper heat radiation block 12a has the lower surface of the upper and lower two surfaces formed by the longitudinal direction, and the middle heat radiation block 12b has the upper and lower two surfaces formed by the longitudinal direction. In addition, the lower heat dissipation block 12c has the upper surface of the two upper and lower surfaces formed in the longitudinal direction connected to the positive temperature coefficient thermistor element 11. ..., 11
The heat receiving surface receives heat from the heat dissipating surface.

Next, the insulating spacer 15 is made of heat-resistant resin or porcelain, and as shown in FIG.

12b's heat receiving surface and ears 17, 17, 18a, 18a (heat receiving surface and ears 18b, 18 of heat radiation blocks 12b, 12c)
b, 19, 19), while having a shape surrounding the outer periphery of
A round hole 24 is provided in the middle of both ends of the frame 21 in the longitudinal direction.
, 24 are provided, and a plate-shaped spacer portion 20.20 is provided into which a cylindrical insulating sleeve 14a (see FIG. 5) provided on the coupling member 14, which will be described next, can be fitted.

The frame portion 21 also has a rectangular opening 23. A crosspiece 22 is stretched between the opposing long sides of the frame portion 210, and the PTC thermistor element 11.11 is inserted into the frame portion 21.
There are 23.

Like the insulating spacer 15, the coupling member 14 is made of heat-resistant resin or porcelain, and as shown in FIG. 5, a cross-sectional view taken along line I-I' in FIG. A notch 14b is provided at one end of the heat generating unit, and an insulating plate 14d is vertically protruded near the other end of a rectangular mounting plate 14c, which is attached to, for example, an exterior case (not shown) with screws, etc. An insulating sleeve 14a is protruded from the insulating plate 14d in parallel to the vicinity of the other end of the mounting plate 14c, and the opening on the insulating plate 14d side is tapered.

Returning to FIG. 3 again, 25, 26 and 27 are screws, nuts and washers as tightening members, respectively,
These screws 25, nuts 26, and washers 27 are connected to the ears 17.17 of the heat radiation block 12a and the heat radiation block 12.
Ear portion 18a of b.

The ears 18b, 18b of the heat radiation block 18a (heat radiation block O') 12b and the ears 19, 19) of the heat radiation block 12c are tightened via the spacer parts 20, 20 of the insulating spacer 15.

Among the heat dissipation blocks 12a, 12b and 12c,
The frame portion 21 of the insulating spacer 150 is fitted onto the heat receiving surface and ears 19, 19 of the lower heat dissipation block 12C, and the opening 2 is
3. With the two positive temperature coefficient thermistor elements 11 fitted in 23, the heat receiving surface and the ear portion 18 of the middle heat dissipation block 12b
b, 18b are fitted.

In this state, the notches 19' provided in the ears 19, 19
, 19' (Although it may be a round hole, it is preferable to use a notch for convenience of die-casting of the heat dissipation block 12c.

) and the insulating sleeves 14a, 14a of the coupling members 14, 14 are inserted into the round holes 24, 24 provided in the spacer portion 20, 20 of the insulating spacer 15, respectively, and the screws 25, 25 are inserted into these insulating sleeves 14a, 14a. do,
These screws 25, 25, nuts 26.degree. 26, and washers 27,27 are used to tighten the ears 18b, 18b and the ears 19, 19 to each other.

At this time, since the opening of the insulating sleeve 14a on the insulating plate 14d side is tapered, the washers 27, 27 are distorted by the tightening of the nuts 26, 26, and the spring force of the washers 27, 27 causes the heat dissipation block 12b.

The heat receiving surface of 12c is the positive temperature coefficient thermistor element 11.1.
Press it against the heat dissipation surface of No.1.

Further, on the upper heat receiving surface and the ears 18a and 18b of the heat dissipation block 12b in the middle stage, a positive temperature coefficient thermistor element 11°11 and an insulating spacer 15 are placed in exactly the same manner as above.
Stack the heat radiation blocks 12a, screws 25, 25, nuts 26.26 and washers 27.2.
It is tightened by 7.

With the heat generating unit configured as above, as shown in Fig. 6,
Power supply terminal 1 of heat radiation blocks 12a, 12b and 12c
6. ..., the upper heat radiation block 12a and the lower heat radiation block 12 are connected by a female terminal 29 which is press-fitted into the upper heat radiation block 12a from the outside and has a lead wire 28 attached by caulking or the like.
c and the same female terminal 2 as above.
9, when a voltage is applied between the middle heat radiation block 12b and the upper or lower heat radiation block 12a or 12b, each positive temperature coefficient thermistor element 11. ...1
1 generates heat.

Positive temperature coefficient thermistor element 11. . . , 11 is transmitted through the through holes 13 . ..., 13, but the direction of the flow is different from each positive characteristic sensor element 11.
The temperature distribution in the thickness direction of the positive characteristic magnetic plate 11a is almost the same as the temperature of the gas. Because it is not affected, the pinch effect does not occur as in the conventional case, and the through hole 13. ..., 13 is heated with high efficiency.

In addition, since the heat generated by the positive temperature coefficient thermistor elements 11 . 11a is not cooled down rapidly, and the occurrence of power vibration can also be suppressed.

(2) Second Embodiment Next, in the embodiment shown in FIG. 7, four screws 25. ..., 25 with two penetrating screws 30
．． 30 (one is not shown).

), the heat dissipation blocks 12a, 12b and 1
Ears 17, 17, 18a, 18a, 18b, 18 of 2c
b and 19. While tightening the heat dissipation blocks 12a, 12b and 12c, the bullet-shaped power supply terminals 16°..., 1
6, a retaining portion 31a is provided at each tip.

..., 31a, a tab-shaped power supply terminal 31. ...
31 is made to protrude.

The above power supply terminal 31. . . , 31, as shown in FIG. 8, power can be supplied by a female terminal 29' shaped like a leaf spring to which the lead wire 28 is attached by caulking or the like.

Even if the heat generating unit is configured as described above, substantially the same operation and effect as the heat generating unit shown in FIG. 3 can be obtained;
Since two penetrating screws 30 and 30 are used, assembly of the heat generating unit is also simplified.

(3) Third Embodiment In the embodiment shown in FIG. 9, in place of the coupling member 140 provided with the insulating sleeve 14a in the embodiment of FIG.
As shown in the figure, a connecting member 14' provided with a square cylindrical connecting portion 32 and a presser spring 33 formed by bending a plate-shaped spring member into a substantially circular shape are provided, and the connecting members 14', . . . , 14
' each joint 32. ....

32 are fitted onto the ears 17, 17 of the heat radiation block 12a, the ears 18a, 18a of the heat radiation block 12b, the ears iab, iab of the heat radiation block 12b, and the ears 19, 19 of the heat radiation block 12c, respectively. Between the parts 17, 17 and the joint part 32.32 inner wall, the ear part is, is and the joint part 32
．． 32 and the inner wall of the presser spring 33. . . , 33 are interposed, and these presser springs 33. ..., 33, each of the ears 17, 17 and 18a, 18a and each ear part iab, iab and 19.19 are connected to the insulating spacer 1.
They are mutually tightened through spacer portions 20 and 20 of 5.15.

If the heat generating unit has the above configuration, assembly will be easier than that shown in FIG.

Although the basic embodiment of the present invention has been described above, for example, as shown in FIG. 11 for the first embodiment, the mounting plate 14e of the coupling member 14 is attached to The insulating plate 14d may be provided so as to protrude in the direction.

In addition, the screw 25, nut 26, through screw 30, etc.
It is also possible to use pins, rivets, etc.

Furthermore, the present invention provides a positive temperature coefficient thermistor element 11°...
, 11 and the number of heat radiation blocks are not limited to the above embodiments.

As is clear from the detailed description above, the present invention
Tightening is done by means of members and coupling members, with the heat dissipation block and the positive temperature coefficient thermistor element being alternately laminated through spacer portions of insulating spacers such as ears protruding from a rectangular heat dissipation block formed in a honeycomb shape. Since the temperature distribution in the thickness direction of the PTC thermistor element is hardly affected by the above-mentioned gas or liquid, the pinch effect does not occur as in the conventional case. , the above gases and liquids 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
Since it does not heat the above gas, etc., even if the flow velocity of the gas, etc. increases, the above positive temperature coefficient thermistor will not cool down rapidly and cause power oscillation, and the above gas, etc. will be heated at a stable temperature. Can be heated.

Furthermore, the present invention uses a plate-shaped positive temperature resistor element that is easy to mold and bake, and also uses a metal heat dissipation block that is easy to manufacture, so the cost is also lower than that of conventional ones. It can be pulled down to a large width.

Furthermore, since the present invention uses a plate-shaped positive temperature coefficient thirster element that is easy to mold and bake, and also uses a metal heat dissipation block that is easy to manufacture, the cost is also lower than that of conventional ones. At the same time, the heat dissipation blocks are fixed to each other using a connecting member that also serves as a mounting member, making it extremely easy to assemble the heat generating unit and attach it to the exterior case, etc. In addition, since the power supply terminal is provided integrally with the heat dissipation block, the lead wire can be drawn out easily.

[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.
Fig. 3 is a partially sectional front view of an embodiment of the heat generating unit according to the present invention, and Fig. 4 is a perspective view showing the main parts of Fig. 3. , FIGS. 5a and 5b are respectively a perspective view of an insulating spacer and a sectional view of a coupling member, FIG. 6 is a perspective view of a female terminal that supplies power to a bullet-shaped power supply terminal, and FIG. 1 is a second embodiment of the present invention. FIG. 8 is a perspective view of a female terminal that supplies power to a tab-shaped power supply terminal; FIG. 9 is a perspective view showing essential parts of a third embodiment of the present invention; FIG. 10 9 is a perspective view of a coupling member and a presser spring used in the embodiment shown in FIG. 9, and FIG. 11 is a perspective view showing a main part of a modification of FIG. 3. 11...Positive characteristic servo element, 12a, 12b. 12c... Heat dissipation block, 13... Through hole, 14.
...Coupling member (14a...insulating sleeve, 14b...
・Notch, 14c...Mounting plate, 14d...Insulating member), 15...Insulating spacer (20...Spacer part)
, 16... power supply terminal, 17, 18a, 18b, 19.
・・Ear portion, 21 ・・Frame portion, 23 ・・Opening, 29.
29'-- Female terminal, 30... Penetration screw, 31...
Power supply terminal.

Claims (1)

[Claims] 1. A large number of through-holes are provided in the thickness direction to form a square shape, and an ear portion for coupling with a power supply terminal is provided protruding from the end surface in the longitudinal direction, and at least one surface formed by the above-mentioned longitudinal direction is provided. A plurality of rectangular parallelepiped heat radiating blocks made of a metal with good thermal and electrical conductivity, each of which has a heat receiving surface of a positive temperature coefficient thermistor element interposed in the heat dissipation block, a spacer part interposed between the ear parts, an opening into which the positive temperature coefficient thermistor element is inserted, and the heat receiving surface of the heat dissipation block and an outer peripheral part of the ear part. An insulating spacer having a frame surrounding the insulating spacer is provided, and a member is used to tighten each of the ear parts to each other through the spacer part of the insulating spacer. The above-mentioned tightening member is provided with a connecting member for attaching the member, and the above-mentioned positive temperature coefficient thermistor element and the heat radiation block are alternately laminated, and the said heat radiation block is fixed to each other by the tightening member and the connecting member. Features a heat generating unit.