JPS6035253Y2 - Piezoelectric element unit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a piezoelectric element unit used by being incorporated into a gas appliance, etc., and provides a piezoelectric element unit with a simple structure and improved product reliability.

A conventional piezoelectric element unit of this type will be explained with reference to FIGS. 1 to 5.

That is, the intermediate terminal plate 1 is located at the center of the case 2,
Inside the case 2, piezoelectric elements 3, 3a are arranged facing each other on both sides of the intermediate terminal plate 1 so as to be in contact therewith, and spacers 4. 4a, a pad 5, and a pad 6 are respectively stored and arranged.

Conventionally, the intermediate terminal plate 1 is inserted from above into the intermediate terminal plate insertion hole 2a located in the center of the case 2.
After arranging the piezoelectric elements 3, 3a, spacers 4, 4a, padding metal 5, and padding plate 6, the epoxy resin 7 injected from the lead wire insertion part 2b provided in the case 2 is used as shown in FIG. All parts were firmly attached.

This also prevents the intermediate terminal plate 1 from coming off in the opposite direction of insertion.

Note that a lead wire (not shown) for extracting high voltage is connected to the intermediate terminal plate 1.

However, in a piezoelectric element unit with such a conventional structure, the ability to prevent the intermediate terminal plate from being removed in the opposite direction of insertion during high temperature conditions is weak, and there is a risk of the intermediate terminal board coming off, resulting in an unexpected quality issue. This was a contributing factor.

The present invention has been devised to eliminate the drawbacks of the prior art as described above, and one embodiment thereof will be described below with reference to FIGS. 6 to 8, with the same numbers assigned to the same parts as above.

That is, in the present invention, the positional configuration of each component is the same as the conventional one, so the explanation will be omitted. is provided with a locking hole 1a, and is configured such that when the intermediate terminal plate 1 is inserted into the case 2, the protrusion 2c is fitted and locked into the locking hole 1a. .

After that, each part is fixed with epoxy resin 7 in the same manner as described above.

As described above, the piezoelectric element unit of the present invention is configured such that the protrusion provided in the intermediate terminal board insertion hole of the case is fitted and locked into the locking hole provided in the intermediate terminal board. Therefore, removal of the intermediate terminal board in the opposite direction of insertion is completely prevented, and one of the causes of unstable quality can be eliminated.
This can improve product reliability.

In addition, it is easy to assemble, has a simple structure, and has great practicality.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional piezoelectric element unit;
The figure is a perspective view of the same, Figures 3 and 4 are a top view of the case composing the unit and a front view of the intermediate terminal board, Figure 5 is a sectional view of the main part of the unit after resin injection, and Figure 6 7 is a top view of the main part of the case constituting the piezoelectric element unit according to the present invention, FIG. 7 is a front view of the intermediate terminal board, and FIG. 8 is a sectional view of the main part of the same unit after resin injection. DESCRIPTION OF SYMBOLS 1... Intermediate terminal board, 1a... Locking hole, 2... Case, 2a... Intermediate terminal board insertion hole, 2c... ...Protrusion, 3, 3a...
... Piezoelectric element, 4, 4a... Spacer, 5...
...Patch, 6 patch plate.

Claims (1)

[Scope of utility model registration request] In a piezoelectric element unit that includes a pair of piezoelectric elements facing each other via an intermediate terminal plate, and a spacer, a pad, and a pad that abut the outer end surface of the piezoelectric element, each housed in a case, the intermediate terminal plate of the case A piezoelectric element unit comprising a protrusion provided in the insertion hole, a locking hole provided in the intermediate terminal plate, and a protrusion of the case fitted and locked in the locking hole of the intermediate terminal plate.