JPH0590160U - Piezoelectric unit - Google Patents

Abstract

(57) [Summary] [Purpose] When attaching a cord to a piezoelectric unit, it is possible to improve the workability of attaching the cord by eliminating the use of the adhesive that has been used conventionally, and to improve the working environment. [Structure] A piezoelectric unit in which a heat-shrinkable tube with an adhesive is interposed in close contact with the outer periphery of a cylindrical portion protruding from a cord and the piezoelectric unit. [Effect] Since the use of the conventional adhesive is no longer necessary, the product yield can be improved by improving the workability, improving the working environment, and reducing the defective appearance due to the protrusion of the adhesive.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a piezoelectric unit as a gas ignition source attached to a gas appliance or the like.

[0001]

[Prior Art]

 Conventionally, a high voltage derivation cord (hereinafter referred to as a cord) attached to a piezoelectric unit has been attached to a tubular portion protruding from a unit case via an adhesive.

[0002]

[Problems to be solved by the device]

 In the conventional piezoelectric unit as described above, since adhesive is used for attaching the cord, it is necessary to prepare the adhesive and heat cure it. However, there was a problem that the product yield decreased.

The present invention has been made to solve the above problems.

[0004]

[Means for Solving the Problems]

 The piezoelectric unit (1) according to the present invention employs the following means for attaching the cord (2) to the piezoelectric unit (1).

That is, the cord (2) and the piezoelectric unit case (3) are joined using a heat-shrinkable tube (hereinafter referred to as a heat-shrinkable tube with an adhesive) (9) having an inner wall coated with an adhesive agent in advance. It is a thing.

Specifically, the heat-shrinkable tube (9) with an adhesive and having an inner diameter larger than the outer diameter of the tubular portion (4) protruding from the piezoelectric unit case (3) is attached to the cord (2). ), And then the cord (2) is inserted into the high voltage lead-out electrode (6) protruding outward in the cylindrical portion (4) protruding from the piezoelectric unit case (3).

At this time, it is necessary to surely insert the core wire in the cord (2) into contact with the high-voltage derivation electrode (6).

Next, the piezoelectric unit (1) into which the cord (2) is inserted is put into a heating furnace or subjected to hot air so that the heat-shrinkable tube (9) with an adhesive can be heat-shrinked. At that time, the heat-shrinkable tube (9) with adhesive that has received the heat radiation shrinks at the same time, and the adhesive applied to the inner wall of the heat-shrinkable tube (9) is softened to form a tubular shape with the cord (2). The part (4) is adhered by a heat-shrinkable tube (9) with an adhesive.

[0009]

【Example】

 1 and 2 show an embodiment of the present invention, that is, a cord (2) having an outer diameter of 4 mm and a tubular portion (4) having an outer diameter of 6.5 mm are heat-treated with an adhesive having an inner diameter of 7 mm. Arrange the condensing tube (9) and put it in a heating furnace heated to 120 ° C to 150 ° C.

By this heating, the cord (2) and the tubular portion (4) are closely adhered and adhered to the heat-shrinkable tube (9) with an adhesive.

Even if the cord (2) is subjected to a tensile stress from the outside, the cord (2) is pulled in addition to the adhesive force of the close contact, so that the cord (2) and the tubular portion (4) are easily decompressed to reduce the space. Can not be extracted.

In the present invention, the cord (2) or the tubular portion (4) is inserted from the outer periphery of the heat-shrinkable tube (9) with an adhesive so as to increase the adhesive strength to the tubular portion (4) of the cord (2). It has been confirmed that it is effective to apply heat staking for locally deforming the heat-shrinkable tube (9) with adhesive between and.

[0013]

[Effect of the device]

 The present invention has the following effects while having a cord (2) fixing force similar to that of the conventional one.

That is, since the use of the so-called conventional adhesive is no longer necessary, the workability of attaching the cord (2) is greatly improved, and at the same time, the steam and odor emitted from the adhesive are significantly reduced, and the working environment is extremely high. It is good.

Further, the reduction in the defective appearance of the piezoelectric unit (1) due to the protrusion of the adhesive brings an improvement in the product yield.

[0016]

[Brief description of drawings]

FIG. 1 is a front view of a piezoelectric unit according to the present invention, and FIG. 2 is a sectional view of the same. FIG. 3 is a front view of the piezoelectric unit (1) in which the heat-shrinkable tube (9) with an adhesive is subjected to heat staking, and FIG. 4 is a side view of the same. DESCRIPTION OF SYMBOLS 1 ... Piezoelectric unit 2 ... Code 3 ... Piezoelectric unit case 4 ... Cylindrical part 5 ... Piezoelectric element 6 ... High voltage derivation electrode 7 ... Pad
8 ... Seat plate 9 ... Heat shrink tube with adhesive

Claims (1)

[Scope of utility model registration request] When the cord (2) is attached to the tubular portion (4) protruding from the piezoelectric unit case (3), the cord (2) and the outer periphery of the tubular portion (4) are adhered and adhered to each other to cause heat shrinkage with an adhesive. A piezoelectric unit (1) with a tube (9) interposed.