JPS6143095Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric unit used in a piezoelectric ignition device for gas appliances.

Generally, as shown in FIG. 1, this type of piezoelectric unit applies impact force or pressurizing force to piezoelectric elements 1 and 2 disposed between a pressurizer 4 and a stator 5 in an insulating case 6. The leg 3 of the terminal plate 3 inserted between the positive electrode surfaces 1a and 2a of the piezoelectric element is used to lead out the high voltage generated when propagating through the
A tubular portion 6a surrounding the insulating case 6 is provided protruding from the side of the insulating case 6, and one end of a long high voltage electric wire 7 is inserted into the tubular portion 6a, and a core wire 7a is exposed from the end surface.
was press-fitted into the terminal leg 3a, and an adhesive was applied to fix the wire 7 to the tubular portion 6a of the insulating case.

On the other hand, depending on the model, the electrode plug that applies spark discharge to the gas burner to ignite the ejected gas may be installed in a direction perpendicular to the axis of the piezoelectric unit, and the piezoelectric When connecting the other end of the high-voltage wire of the unit, since the wire is conventionally fixed integrally to the insulating case as described above, one end of the wire is bent approximately at a right angle, as shown by the dashed line in Figure 1B. The tensile stress caused the adhesive layer to break and the electrical wire to separate from the tubular portion 6a of the case and the terminal leg 3a.

In order to solve this problem, the present invention is constructed so that the high-voltage cable can be rotated with respect to the insulating case.The present invention will be explained below based on the embodiment shown in FIG.

Figure 2 shows an example of this proposal.
and 12 are a pair of piezoelectric elements manufactured in a cylindrical shape from lead zirconate titanate porcelain and having electrodes 11a, 11b and 12a, 12b attached to both end faces, with the positive electrode faces, here 11a and 12a, on the inside, and They are opposed to each other via a buffer plate 13 made of soft metal such as aluminum, if necessary. 14 is a metal presser that comes into contact with the negative electrode surface 11b of the one piezoelectric element 11 and applies impact force, such as a hammer, to the piezoelectric element;
15 is a metal stator that comes into contact with the negative electrode surface 12b of the other piezoelectric element 12 and reflects the impact force; 16;
is a cylindrical insulating case made of synthetic resin that houses the piezoelectric elements 11 and 12, the buffer plate 13, the pressurizer 14, and the stator 15 in tandem, and the piezoelectric element 11 is housed in the case at the center in the longitudinal direction. , 12, with slots 16a exposing most of the peripheral edges 11a', 12a' of the positive electrodes. Reference numeral 18 denotes an annular insulating holder made of synthetic resin that is rotatably fitted to the outer circumferential surface of the area including the slot 16a of the insulating case, and has one end of the high voltage electric wire 17 fixed to the upper surface thereof and is exposed from the end surface of the electric wire 17. A tubular protrusion 18 that allows the core wire 17a to face the peripheral edges 11a' and 12a' of the positive electrode of the piezoelectric element through the slot 16a of the case.
Contains a.

In the above, the core wire 17a of the high-voltage cable is opposed to the positive electrode peripheral edges 11a' and 12a' of the piezoelectric element in the case with a gap provided by the slot 16. In order to improve this, a part of the core wire may be slidably connected to the periphery of the positive electrode through the exposed slot 16a.

In addition, in order to ensure the positioning of the insulating holder 18, a shallow circumferential groove is cut on the outer peripheral surface of the insulating case 18, including the slot 18a, and the holder 18 is inserted into the groove.
It is best to fit it elastically.

Furthermore, although the embodiment described above has been described using two piezoelectric elements, it goes without saying that the present invention can also be applied to a case where only one piezoelectric element is used.

As described above, in the piezoelectric unit of the present invention, a slot is formed in the side of the insulating case to expose most of the periphery of the positive electrode of the piezoelectric element housed in the case, and the positive electrode of the piezoelectric element and the slot are connected to each other through the slot. Since the structure is such that an annular insulating holder to which a high-voltage cable for electrical connection is attached is rotatably fitted to the outer peripheral surface including the slot of the insulating case, the high-voltage cable can be attached to the high-voltage cable as shown by the chain line in Fig. 2B. Since the wire can be rotated and displaced in any direction without bending or applying tensile stress, it is possible to easily connect the wire to the electrode plug and prevent the wire from coming off.

[Brief explanation of drawings]

Figure 1 shows a conventional example, where A is a front sectional view and B is a
Figure 2 is a side sectional view taken along line E-A, Figure 2 shows an embodiment of the present invention, A is a front sectional view, B is a side sectional view taken along line A-RO, and C is an insulating case and an insulating holder. FIG. 11, 12...Piezoelectric element, 11a, 12a...
Positive electrodes, 11a', 12a'...periphery thereof, 14...
Pressure element, 15...Stator, 16...Insulation case,
16a...Slot, 17...High voltage electrical cable, 18...
...Insulated holder.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical insulating case that houses the main components such as the piezoelectric element, pressurizer, and stator in tandem, and has a slot on the side that exposes most of the periphery of the positive electrode of the piezoelectric element, and one end of the high-voltage cable. The insulating holder is rotatably fitted onto the outer peripheral surface of the insulating case including the slot, and one end of the high voltage wire is connected to the positive side of the piezoelectric element in the case through the slot. A piezoelectric unit characterized by being electrically connected to an electrode.