JPS5845788B2 - 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, this type of heat generating unit has been produced by forming a honeycomb shape by providing a large number of through holes 2, . Ohmic electrodes 3 and 4 are provided on both end faces, and power is supplied to these electrodes 3''J, - and 4 to generate heat in the positive characteristic porcelain 1, and the air sent from the fan 5 is passed through the through holes 2, 4. . . ., a honeycomb-shaped 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 circumferential surfaces. Ladder type heaters are known that are arranged parallel to each other and are heated by passing air or liquid between them.

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

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.

Further, when the wind speed of the wind W sent from the fan 5 becomes faster, the resistance of the positive characteristic porcelain 1 becomes smaller, the current flowing becomes larger, and the amount of heat generated increases, but when the wind speed reaches a predetermined value, If the resistance value of the positive characteristic porcelain 1 is exceeded, the resistance value of the positive characteristic porcelain 1 becomes unstable around that point, and power consumption periodically fluctuates, so-called power oscillation occurs, and the wind sent out from the positive characteristic porcelain 1 increases. The disadvantage was that the temperature of the

The present invention was made in order to eliminate the above-mentioned disadvantages of conventional heat generating units. The positive temperature resistor elements fitted into the frame are stacked alternately, and the coupling member is inserted into the insertion hole that communicates with the heat radiation block provided at both ends and the mounting frame to prevent it from coming out inside the heat radiation block. By doing so, the positive temperature coefficient thermistor element and the heat radiation block are integrated, and 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 radiation block, A positive temperature sensor in the form of a plate that is easy to mold and bake, which prevents pinch effects and power vibrations from occurring in the positive temperature sensor element, improves heat generation efficiency, and stabilizes temperature fluctuations.
Reduce costs by using a star element and an inexpensive metal heat dissipation block. - A step is provided in the middle of the through hole of the heat dissipation block to prevent the rod-shaped coupling member from protruding to the outside.
The object of the present invention is to provide a heat generating unit which has a simple shape, and (1) has a power supply terminal integrated with the heat dissipation block to simplify the drawing out of lead wires.

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

Regarding FIGS. 3 and 4, 11. ..., 11 is a plate-shaped positive temperature coefficient thermistor element, 12a, 12b, and 1.
2c has a large number of hexagonal through holes 13 in the thickness direction.
, 13 and formed into a honeycomb shape, 1
4.14 is the positive temperature coefficient thermistor element 11. ..., 1
15. 15 is the mounting frame that accommodates the heat dissipation block 1.
Penetration screw connecting 2a, 12b, 12c, 16.16
is a nut for preventing these through screws 15 and 15 from coming off.

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 porcelain plate 11a, respectively, and the electrode surfaces of these electrodes 11b and 11c are respectively heat dissipating surfaces. It is a double-sided electrode type.

On the other hand, the heat dissipation blocks 12a, 12b, and 12c are made of a metal with good thermal and electrical conductivity such as aluminum, for example, by die-casting, so that the length thereof meets the above-mentioned positive characteristic curve.
Star element 11. . . . is slightly larger than twice the length of 11, and has a wall thickness of the above-mentioned positive temperature coefficient resistor element 11.・
... The heat dissipation block 12 is formed into a rectangular honeycomb shape with a width equal to or slightly larger than the width of the heat dissipation block 12.
Tongue-shaped tab terminals 17, . . . , 17 are provided on both end surfaces of a, 12bt- and 12c.

Further, the heat dissipation blocks 12a, 12b and 12c have insertion holes 18, .
, 18 are provided therethrough.

Among the insertion holes 18, ... 18, the heat radiation block 1
The insertion hole 18.18 of 2a and the insertion hole 18.18 of the heat radiation block 12c are connected to the screw head 15 of the through screw 15.15, as shown in FIG. 3 for the heat radiation block 12a.
The through screws 15 and 15a are made to have a diameter that can be inserted, and the diameter is slightly larger in the middle than the diameter of the through screw, so that the through screw 15 and 15 are prevented from being pulled out.

Further, the through holes 18.18 of the heat dissipation block 12b are inserted with the through screws 15.15.
15 has a diameter that allows insertion of a cylindrical insulating sleeve 19.19 that insulates the heat radiation block 12b.

- Insulating sleeve 19゜19 has a through screw 15.15
This is not particularly necessary if the insulation is pre-insulated.

Next, positive temperature coefficient thermistor element 11. The mounting frame 14.14 that accommodates the two positive temperature coefficient thermistor elements 11.11 is made of heat-resistant resin or porcelain.
These mounting frames 14 and 14 are formed in the shape of a frame that surrounds the two positive temperature sensor elements 11 and 1.
A frame portion 14b is provided on the outer periphery of the main body portion 14a into which the outer periphery of the heat dissipation surface of the heat sink 1 is fitted, and a lug 14 into which the positive temperature coefficient thermistor elements 11, 11 are fitted into the main body portion 14a.
Openings 14c, 14c are provided which are divided by 14' (note, the above-mentioned opening 14' may be omitted).

). Among the mounting frames 14 and 14 above, the lower mounting frame 14
The heat receiving surface of the lowermost heat dissipation block 12c, which is in close thermal contact with the heat dissipation surface of the PTC thermistor element 11°11, is fitted into the lower surface side of the PTC thermistor element 11°, and the two PTC thermistor elements 11° are inserted into the opening 14c. 11 is fitted, the lower heat receiving surface of the middle heat radiation block 12b is fitted into the frame portion 14b of the mounting frame 14.

Further, the upper heat receiving surface of the heat dissipation block 12b is fitted into the frame portion 14b of the upper mounting frame 14, and the two positive temperature coefficient resistor elements'+i, ii are inserted into the opening 14c of the mounting frame 14. The insulating sleeve 19.19 is inserted through the insertion hole 20.20 provided in the upper mounting frame 14 and passed through the insertion hole 18.18 of the heat dissipation block 12b to the lower mounting frame 1.
4, the heat receiving surface of the uppermost heat radiation block 12a is fitted into the upper frame portion 14b of the mounting frame 14.

In the above state, insert the through screws 15.15 into the heat radiation block 12.
Insertion hole 18.18 of a, insulation sleeve 19.19''J,
- and is inserted into the insertion hole 18.18 of the heat dissipation block 12c and screwed with a nut 16.16.

In this way, the heat radiation blocks 12a, 12b$- and 12c, the positive temperature coefficient thermistor elements 11°..., 11 are replaced by the heat radiation blocks 12a, the positive temperature coefficient thermistor elements 11, 1
1. heat dissipation block 12b, positive temperature coefficient thermistor element 11,
11. The heat dissipation block 12c is laminated from above in this order, and the positive characteristic servo element 11. . . . The heat dissipating surfaces of the heat dissipating blocks 11 and the heat receiving surfaces of the heat dissipating blocks 12a, 12b, and 12c are fixed to each other by through screws 15°, buttons 15, and nuts 16 and 16 in a state in which they are in close contact electrically and thermally. .

Further, the through screw 15.15 is connected to the insulating sleeve 19.
19, the screw heads 15a, 15a of the through screws 15.15 are insulated from the heat dissipation block 12b.
Muyobi Nut 16.16 also heat radiation block 12a and 1
2b and can be made invisible from the outside, and furthermore, since the frame part 14a of the mounting frame 14.14 is provided,
Infiltration of dust and the like is also prevented.

The round holes 21.degree. 21 provided in the heat radiation block 12a and the round holes 21.degree. 21 provided in the heat radiation block 12c are mounting holes for attaching the heat generating unit to a set or the like.

With the heat generating unit configured as described above, as shown in Fig. 3,
The tab terminals 17 of the heat dissipation blocks 12a, 12b and 12c are connected by bending both ends of a plate-like plate having spring properties and attaching the lead wires 22 by caulking or the like.
,... 17, the heat dissipation block 1
2a and 12c are connected to each other, and the same female terminal 2 as above is connected.
3, when a voltage is applied between the heat radiation block 12b and the heat radiation block 12a or 12c, each positive temperature coefficient thermistor element 11. ..., 11 generates heat.

Positive characteristic sensor element 11. ... 11 is transmitted to the gas flowing through the through holes 13, . The button is perpendicular to the direction of the voltage applied to the plate 11a from the electrodes 11b and 11c, and the temperature distribution in the thickness direction of the positive characteristic porcelain plate 11a is hardly affected by the temperature of the gas. , unlike the conventional case, the pinch effect does not occur, and the gas flowing through the through holes 13, . . . , 13 is heated with high efficiency.

Further, the heat generated by the positive temperature coefficient thermistor elements 11, . . .
Since the power is transmitted to the gas through the gas, even if the flow velocity of the gas increases, the positive characteristic ceramic plate 11a will not be cooled down rapidly and power oscillation will not occur.

Although basic embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.
For example, instead of the tab terminals 17, . . . , 17, the power supply terminals provided on the heat dissipation blocks 12a, 12b, and 12c may be replaced with gypsum-shaped male terminals 17', . . ., as shown in FIG. - Connect the cylindrical female terminal 24 attached to one end of the lead wire 22 with the male terminal 17' protruding from the male terminal 17'.
. . , 17' may be press-fitted from the outside to supply power to the positive temperature coefficient thermistor elements 11, . . . , 11.

In this case, as shown in FIG. 6, if a female terminal 24' with both ends open is used, two (or more) heat generating units can be used in combination.

Further, the through screws 15 and 15 and the nuts 16 and 16 shown in FIGS. ... 1
1 and the number of heat dissipation blocks 12a, 12b buttons and 12c are not limited to the above embodiments.

As is clear from the detailed explanation above, it is made of metal with good thermal and electrical conductivity, which has an insertion hole that prevents the coupling member from coming out inside and has many through holes in the thickness direction. The rectangular parallelepiped-shaped heat dissipation block and the PTC thermistor element are alternately stacked, and the coupling member is inserted into the insertion hole to integrate the PTC thermistor element and the heat dissipation block. The temperature distribution in the thickness direction of the characteristic thermistor element is almost unaffected by the above gases or liquids, so the pinch effect does not occur as in the conventional case, and the temperature distribution in the thickness direction of the thermistor element is highly efficient. can be heated.

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 positive temperature coefficient thermistor element 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 bottom mold and a plate-shaped positive temperature resistor element that is easy to fire, and uses a metal heat dissipation block that is easy to manufacture, so the cost is lower than that of the conventional one. Although it can be lowered more widely than the conventional heat generating unit, since the connecting member is inserted through the insertion hole whose diameter is reduced in the middle, a portion of the connecting member protrudes outside the heat generating unit. This is not the case, and the shape of the heat generating unit can be made very simple.

Furthermore, since the heat dissipation block is integrally provided with a power-connecting terminal, the lead wire can be drawn out very easily.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional heat generating unit. Figure 2 is an explanatory diagram of the temperature distribution in the thickness direction of the positive characteristic porcelain shown in Figure 1;
The figure is a partially cross-sectional perspective view of the heat generating unit according to the present invention.
The figure is an exploded perspective view of FIG. 3, FIG. 5 is a perspective view of a steam engine using bullet-shaped female terminals and male terminals, and FIG. 6 is an explanatory diagram of a case where two heat generating units are combined. 11... Positive temperature coefficient thermistor element, 12a, 12b, 1
2c... Heat dissipation block, 13... Through hole, 14...
・Mounting frame (14a...body part, 14b...frame part,
14c... opening), 15.15... through screw (1
5a... screw head), 16... nut, 17... tab element, 18... insertion hole, 19... insulation sleeve.

Claims (1)

[Claims] 1. A plurality of rectangular parallelepiped-shaped heat dissipation blocks made of a metal with good thermal and electrical conductivity, each having a large number of through holes in the thickness direction and having a power supply terminal protruding from at least one of both end faces in the longitudinal direction. , a plate-shaped PTC thermistor element interposed between the heat dissipation blocks with both sides as heat dissipation surfaces, and a frame section provided on the outer periphery of the main body portion into which the outer periphery of the heat dissipation surface of these PTC thermistor elements is fitted. With,
A mounting frame having an opening into which the PTC thermistor element is inserted is provided in the main body part, and the PTC thermistor element is inserted into the opening of the mounting frame, and the heat dissipation block and the PTC thermistor element are connected to each other. and are alternately stacked, while the heat dissipation block is inserted into insertion holes provided at both ends of the heat dissipation block and both ends of the main body portion of the mounting frame so as to communicate with each other, and both ends are prevented from coming out within the heat dissipation block. , at least one heat dissipation block is provided with a plurality of rod-shaped coupling members treated to be electrically insulated, and the PTC thermistor element and the heat dissipation block are integrated by the coupling members. Features a heat generating unit.