JPH0452953Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a heat-resistant terminal for a sheet heating element for connecting a heat-resistant lead wire to a pair of lead foils protruding from a heating element, particularly a sheet heating element. Regarding the stand.

[Conventional technology] Planar heaters are mainly made of ceramics with a diameter of 1 mm or less,
It is formed by sandwiching a thin heating element between insulating materials such as mica in a sandwich-like manner. After the lead wire and the heating element are connected by soldering, an insulating cover is attached to this connection part. However, since the solder in high-temperature specification planar heating elements melts when the temperature exceeds 300°C, soldering cannot be used to connect the lead wires to the heating element, and the connection must be made by electric welding or brazing. This is a common practice in which a lead foil is drawn out perpendicularly through the insulating material of a planar heating element and connected to a heat-resistant lead wire.

As shown in FIG. 13, the conventional connection method is to connect a thin heating element 3 of a planar heating element 31 which is sandwiched from above and below by insulating materials 34 and 35 such as ceramics.
In order to connect the heat-resistant lead wire 37 to the lead foil 33 whose one end is connected to the heat-resistant lead wire 37, the lead foil 33 projected above the planar heating element 31 and the crimp terminal 38 fixed to the end of the heat-resistant lead wire 37 are connected. Screw 39 and nut 40
Connect with. Next, in order to insulate this connection part from the outside, magnesia powder or an inorganic adhesive 42 is contained in a cylindrical insulator 41 placed around the connection part and on the insulating material 34 for filling and bonding. Fixed.

[Problems to be solved by the invention] An extremely thin planar heating element 31 is connected to a heating plate 45 and a pressing plate 46.
When it is installed between the heating element 31 and the heating element manufacturer, there are cases where it is installed by the heating element manufacturer, and cases where it is installed by the user to maintain confidentiality. foil 33
Since it is extremely thin, the adhesive strength of the inorganic adhesive 42 to the insulating material 34 is insufficient, and the cylindrical insulator 41 moves easily and is weak in strength. Furthermore, the user
When incorporating the lead foil 33, the strength is low and it is easy to break, and furthermore, magnesia powder, inorganic adhesive 42, etc. absorb moisture, resulting in a decrease in insulation function. Was.

[Means for Solving the Problems] The present invention was made in view of the problems of the conventional terminal block for planar heating elements, and has a structure in which bolt holes 12 and straight lines are formed in an insulator made of an insulating material. A heat-resistant terminal block 7 in which a pair of slot holes 8 positioned above are provided vertically through each hole, and screw holes 11 communicating with a recessed seat portion 10 provided on the front are formed orthogonally to each slot 8. and connected to the heating element 2 to form the planar heating element 1.
It consists of a pair of lead foils 3 projecting outward, and a crimp terminal 22 attached to one end of a heat-resistant lead wire 21 connected to the lead foils 3. The lead foil 3 inserted from below into the slot 8 and the crimp terminal 22 inserted from above into the slot 8 are connected and fixed with screws 15 inserted into the screw holes 11 from the recessed seats 10 provided on the heat-resistant terminal block 7. It is characterized by:

[Function] To connect the pair of lead foils protruding to the outside of the planar heating element and the heat-resistant lead wire within the slot provided inside the heat-resistant terminal block made of an insulating material, and to fix them to the heat-resistant terminal block. This heat-resistant terminal block can be reliably fixed to the planar heating element using a plurality of lead foils.

[Embodiment] The embodiment of the present invention will be described with reference to the drawings.
An extremely thin sheet heating element 1 is formed by sandwiching the top and bottom of the heating element 2 between insulating materials 4, 5 such as ceramic or mica, and one end of a lead foil 3 is fixed to the heating element 2 of the sheet heating element. The other end of the lead foil 3 is erected upward and has a hole 3a in its center.

Reference numeral 7 denotes a heat-resistant terminal block made of an insulator made of an insulating material such as ceramic, and a pair of narrow slot holes 8 are provided on one side of the plane in the same straight line, penetrating the terminal block vertically.
Furthermore, circular storage chambers 9 are formed above the slots 8, respectively.

A recessed seat part 10 is provided on the front side of the heat-resistant terminal block 7 to accommodate the head of a screw 15 to be described later.
A screw 11 that penetrates to the other end is formed in the center of the
Furthermore, the heat-resistant terminal block 7 is located at the center of the plane of the heat-resistant terminal block 7.
A bolt hole 12 for inserting a bolt 18 for temporarily fixing the sheet to the planar heating element 1 is passed through in the vertical direction.

15 is a screw hole 11 of the heat-resistant terminal block 7 for connecting the lead foil 3 and the crimp terminal 22 in the slot 8.
A screw 16 for fixing is a support plate into which the tip of the screw 15 is screwed and tightened, and is housed in the slot 8, with a screw hole 17 provided in the center. A bolt 18 is inserted into the bolt hole 12, and the bolt 18 passes through a mounting hole (not shown) provided in the planar heating element 1 and is attached to the nut 1 until it is assembled.
9 for temporary fixing, and is inserted into a screw hole (not shown) provided in the hot plate 27 or presser plate 28 and tightened as shown in FIG.

The end of the heat-resistant lead wire 21 is fixed to a holding portion 22a located at one end of a crimp terminal 22, and a Teflon or glass tube 24 made of an insulating material is inserted through the outside of the crimp terminal 22 for insulation. .

Furthermore, if the insulator 7 is attached to the outside of the pressure plate 28, or if the lead foil 3 is too long or the heat-resistant terminal block 7a is too low, the heat-resistant terminal block 7a can also be fixed to the sheet heating element 1 by bolts 18 and nuts 19 via a circular insulator 26 made of insulating material between the sheet heating element 1 and the heat-resistant terminal block 7a, as shown in Figure 12.

To explain the operation of this embodiment, the heating element 2
A pair of lead foils 3, which are connected at one end to the sheet heating element 1 and protrude outward such as above, below, and to the sides, are inserted into the heat-resistant terminal block 7 through a groove hole 8 in the vertical direction. Insert each from below inside. Next, the support plate 16 accommodated in the hole 3a of the lead foil 3 and the slot 8
The screw hole 17 provided in the center of the heat-resistant terminal block 7 is aligned with the screw hole 17, and the crimp terminal 21, which has a hole 23 in the center and is fixed to the tip of the heat-resistant lead wire 22, is inserted from above into the slot 8 of the heat-resistant terminal block 7. With the foil 3 and the support plate 16 aligned with each hole of the crimp terminal 22, the recessed seat portion 10 is
When the tip of the screw 15 inserted into the screw hole 1 in the center of the support plate 17 is aligned with the screw hole 17 of the support plate 17 and screwed, the crimp terminal 22 connected to the lead foil 3 and the heat-resistant lead wire 21 is electrically connected. The screw 15 that can be connected and further connects the lead foil 3 and the crimp terminal 22 can be fixed to the screw 11 of the heat-resistant terminal block 7 to reliably fix the heat-resistant terminal block 7 and the lead foil 3.

Further, by removing the screw 15 from the screw hole 11, the crimp terminal 22 and the lead foil 3 are separated, and by removing the bolt 18, the heat-resistant terminal block 7 can also be removed from the planar heating element 1. Since a circular storage chamber 9 is provided in the upper part of the slot 8, it is possible to accommodate the holding part 22a for fixing the end of the heat-resistant lead wire 21, and if necessary, an insulating glass glass is provided on the outside of the holding part 22a. A tube 24 may be inserted therethrough.

[Effect of the idea] The present invention has the following effects.

Place the crimp terminal connected to the lead foil of the planar heating element and the heat-resistant lead wire in the slot provided inside the heat-resistant terminal block, connect it with a screw inserted from the outside of the heat-resistant terminal block, and connect it to the heat-resistant terminal block. For fixing, the outside of the connection part is covered by a heat-resistant terminal block, so insulation is complete, and even if the outside of the heat-resistant terminal block is surrounded by a metal plate, it is electrically safe.

A pair of lead foils protruding outward from a planar heating element and a crimp terminal fixed to a heat-resistant lead wire are accommodated in a slot in a heat-resistant terminal block, and a screw is inserted into the screw hole of the terminal block from the outside. Since the heat-resistant terminal block is connected and fixed by the heat-resistant terminal block, it has the advantage of increasing the strength of attachment between the sheet heating element and the heat-resistant terminal block.

Since no magnesia powder or inorganic adhesive is used around the connection between the lead foil and the heat-resistant lead wire, the electrical withstand voltage characteristics can be improved without absorbing moisture and reducing the insulation function.

Since there is no need to fill the area around the connection between the lead foil and the heat-resistant lead wire with magnesia powder or inorganic adhesive, the assembly process can be reduced, the assembly time can be significantly shortened, and work efficiency can be further improved. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of a heat-resistant lead foil connected to a planar heating element via a heat-resistant terminal block, and FIG. 2 is a partially cutaway view of FIG. -A sectional view, Figure 3 is a plan view of the heat-resistant terminal block, Figure 4 is a sectional view taken along line B-B in Figure 3, Figure 5 is a sectional view taken along line C-C in Figure 3, and Figure 6 is a sectional view taken along line C-C in Figure 3. Figure 3 is a cross-sectional view taken along the line D-D, Figure 7 is a cross-sectional view of the planar heating element with the lead foil protruding upward, Figure 8 is a cross-sectional view taken along the line E-E in Figure 7, and Figure 9 is a heat resistant A partially omitted back view of the crimp terminal attached to the end of the lead wire, Figure 10 is a front view of the support plate, and Figure 11 is a planar heating element installed between the heating plate and the holding plate. State front view, 12th
The figure is a partially omitted front view of a heat-resistant terminal block mounted on a sheet heating element via a heat-resistant cylindrical insulator.
FIG. 3 is a cross-sectional view of a state in which lead wires are connected to a planar heating element using a conventional method. 1... Planar heating element, 2... Heating element, 3... Lead foil, 4... Insulating material, 7... Heat resistant terminal block, 8...
Slot hole, 11...screw hole, 12...recessed seat, 15
...screw, 22... crimp terminal.

Claims (1)

[Scope of utility model registration request] An insulator made of an insulating material is provided with a bolt hole and a pair of slots located in a straight line, passing through each in the vertical direction, and screw holes communicating with a recessed seat provided on the front are perpendicular to each slot. It consists of the formed heat-resistant terminal block, a pair of lead foils connected to the heating element and protruding outward from the sheet heating element, and a crimp terminal attached to one end of the heat-resistant lead wire connected to the lead foils. Connect the lead foil, which is inserted from below into the slot of the heat-resistant terminal block that is attached to the shaped heating element, and the crimp terminal, which is inserted from above the slot, with a screw that is inserted into the screw hole from the recessed seat provided on the heat-resistant terminal block. Heat-resistant terminal block for fixed sheet heating elements.