JPH0533982Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a wave transducer used underwater, and in particular a structure in which a cylindrical piezoelectric element whose both ends are closed with closing plates is covered with a waterproof molding material. This article relates to a waterproof molded transducer.

[Conventional technology]

A conventional waterproof mold type transducer of this type is disclosed in Japanese Utility Model Publication No. 60-24050.

FIG. 3 is a side sectional view showing an example of such a conventional waterproof molded receiver.

In the figure, 1 is a cylindrical piezoelectric element, and the piezoelectric element 1 has a closing plate 2 at both ends to ensure an air chamber inside.
3, and the closing plates 2 and 3 are connected by a shaft 4 located in the air chamber of the piezoelectric element 1.

The closing plates 2 and 3 have screw holes 2a and 3a formed at predetermined positions, respectively.

5 is a cable located on one side of the closing plate 3,
The piezoelectric element 1 is connected to one end of this cable 5.

Reference numeral 6 indicates a mounting bracket that serves as a mounting part when mounting the waterproof molded wave receiver externally, 7 indicates a screw hole provided at one end of the mounting bracket 6, and 8 indicates a pressure plate whose both ends are closed by the closing plates 2 and 3. It is a waterproof mold material that integrates the electronic 1, a part of the cable 5, and the mounting metal fitting 6, and since the bonding force of the mounting metal fitting 6 with the waterproof mold material 8 is weak, this joint part 9 has peeled off. Even in such a case, a gap d is set between the tube and the closing plate 3 so that water does not penetrate into the piezoelectric element 1, and the screw hole 7 is arranged so as to open at the surface of the waterproof mold material 8.

The procedure for integrating each component with the molding material 8 in this way will be explained with reference to FIG. 4.

FIG. 4 is a sectional view of a main part of the waterproof molding material 8 during molding.

As shown in this figure, the piezoelectric element 1 whose both ends are closed by the closing plates 2 and 3 and a part of the cable 5 are housed in the mold frame 10, and the mold frame 10
The piezoelectric element 1 is positioned and fixed by tightening a plurality of positioning screws 11 passed from the outside into the screw holes 2a and 3a of the closing plates 2 and 3, respectively, and another positioning screw 11 is inserted into the screw hole of the mounting bracket 6. 7, the mounting bracket 6 is positioned and fixed inside the mold frame 10 so that a gap d is obtained between it and the closing plate 3, and in this state, the waterproof molding material 8 is poured into the mold frame 10. Then perform the primary molding.

After the primary mold has hardened, the positioning screws 11 are removed, the mold frame 10 is removed, and the portion A through which the positioning screws 11 have penetrated is filled with a similar waterproof molding material to perform secondary molding.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional waterproof mold type receiver, holes are created by positioning screws when fixing the piezoelectric element to the mold frame, so the molding process is required twice, and the molding process takes time. It was hot.

In addition, due to the difference in time between the two molding operations, the bonding properties of the molding material between the primary mold part and the secondary mold part deteriorate, resulting in peeling at the mold boundary and water intrusion into the piezoelectric element. In addition to this, there was also the problem that the appearance was not good because there was a difference in level between the primary mold part and the secondary mold part.

The present invention was developed to solve these problems. It requires only one molding operation, can reliably prevent water from entering the piezoelectric element, and has a waterproof molded transmitter/receiver type with a good appearance. The purpose is to realize a vessel.

[Means for solving problems]

To achieve this objective, the waterproof molded transducer of the present invention includes a cylindrical piezoelectric element connected to one end of a cable, and a pair of piezoelectric elements that close both ends of the piezoelectric element to ensure an air chamber inside the piezoelectric element. A closing plate, a mounting bracket that has a screw hole at one end that serves as an external attachment part, and the other end is directly fixed to the closing plate located on the cable side, and the joint surface of this mounting bracket with the waterproof molding material. Chloroprene rubber that has good bonding properties with the baked waterproof mold material, the outer periphery of the mounting bracket excluding the surface where the screw hole is provided, the outer periphery of the piezoelectric element whose both ends are closed by the closing plate, and the outer periphery of the end of the cable. It is characterized by being made of an integrally covered waterproof molding material.

[Function] The present invention having such a configuration includes baking chloroprene rubber in advance and fixing the other end of a mounting bracket having a screw hole at one end to a closing plate located on the cable side connected to the piezoelectric element, The piezoelectric element, a part of the cable, and the mounting fittings are housed in the mold frame, and the positioning screws passed from the outside of the mold frame are tightened into the screw holes of the mounting fitting, so that the piezoelectric element can be attached to the mold frame. After fixing the material in a predetermined position inside the mold, waterproof mold material is injected into the mold frame, and after curing, the positioning screws and the mold frame are removed. A waterproof molded transducer is obtained, which has a structure in which the outer periphery of the piezoelectric element whose both ends are closed by the closing plate and the outer periphery of the end of the cable are integrally covered with a waterproof molding material.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing an embodiment of the present invention.

In the figure, 1 is a cylindrical piezoelectric element, and both ends of the piezoelectric element 1 have closing plates 1 to secure an air chamber inside.
2 and 13, and this closing plate 1
2 and 13 are connected by a shaft 14 located in the air chamber of the piezoelectric element 1.

Reference numeral 5 denotes a cable located on one side of the closing plate 13, and the piezoelectric element 1 is connected to one end of this cable 5.

Reference numeral 15 designates a mounting metal fitting that serves as a mounting portion for mounting the waterproof molded wave receiver externally, and reference numeral 16 designates a screw hole provided at one end of this mounting metal 15.

This mounting bracket 15 is mechanically fixed to the closing plate 13 before molding, and its fixing strength is sufficient to keep the piezoelectric part suspended during the molding operation described later.

Reference numeral 17 is chloroprene rubber that has good bonding properties with the waterproof molding material 8. This chloroprene rubber 17 is baked on the joint surface of the mounting bracket 15 with the waterproof molding material 8, and the waterproof molding material 8 allows the closing plate 12, The piezoelectric element 1 with both ends closed at 13, a part of the cable 5, and the mounting fitting 15 are integrated, and a screw hole 16 of the mounting fitting 15 is opened on the surface of the waterproof molding material 8.

The procedure for assembling the waterproof molded receiver having the above configuration will be explained using the drawings.

FIG. 2 is a sectional side view of this embodiment during molding.

First, in this embodiment, since the chloroprene rubber 17 is baked on the joint surface of the mounting bracket 15 with the waterproof mold material 8 as described above, the joint between the mounting bracket 15, the chloroprene rubber 17, and the waterproof mold material 8 is good. Become.

Therefore, there is no need to interpose a molding material between the closing plate 13 that closes one end of the piezoelectric element 1 and the mounting bracket 15 as in the past, so the mounting bracket 1 screw hole 16
The surface opposite to the surface provided with is fixed to the closing plate 13.

The piezoelectric element 1 with both ends closed by the closing plates 12 and 13, the mounting bracket 15 fixed to the closing plate 13, and a part of the cable 5 are molded into a mold frame 1.
A plurality of positioning screws 11 passed from the outside of the mold frame 18 are respectively tightened into the screw holes 16 of the mounting bracket 15.

As a result, the mounting bracket 15 is fixed such that the surface on the screw hole 16 side is in close contact with the inner surface of the mold frame 18, and the piezoelectric element 1 is suspended from the mounting bracket 15 at a predetermined position within the mold frame 18. The mold frame 18 is positioned and fixed in this state.
A waterproof molding material 8 is injected into the inside.

After the waterproof molding material 8 has hardened, the positioning screws 11 are removed, and the mold frame 18 is removed, thereby obtaining a waterproof molded transducer in which the parts other than the screw holes 16 are molded.

[Effect of idea]

As explained above, the waterproof molded transducer of the present invention includes a cylindrical piezoelectric element connected to one end of a cable, and a pair of closing plates that close both ends of the piezoelectric element to ensure an air chamber inside the piezoelectric element. and a mounting bracket that has a screw hole at one end that serves as an external attachment part and has the other end fixed directly to the closing plate located on the cable side, and a mounting bracket that is baked on the joint surface of the waterproof molding material of this mounting bracket. The outer periphery of the mounting bracket excluding the surface where the screw hole is provided, the outer periphery of the piezoelectric element whose both ends are closed by the closing plate, and the outer periphery of the end of the cable are made of chloroprene rubber that has good bonding properties with the waterproof molding material. The structure is made of waterproof molding material that covers the inside, so the following effects can be obtained.

That is, in the present invention, chloroprene rubber is baked in advance and the other end of a mounting bracket having a screw hole at one end is fixed to a closing plate located on the side of the cable connected to the piezoelectric element, and the piezoelectric element and the cable are connected together. The piezoelectric element was fixed at a predetermined position within the mold frame by storing the part and the mounting bracket in the mold frame, and tightening a positioning screw passed from the outside of the mold frame into the screw hole of the mounting bracket. After that, waterproof molding material is injected into the mold formwork, and after curing, the positioning screw and the mold formwork are removed, and the outer periphery of the mounting bracket except for the surface where the screw hole is provided, and the pressure that is closed at both ends by the closing plate are removed. Since the outer periphery of the electronics and the outer periphery of the end of the cable are integrally covered with a waterproof molding material, the molding operation only needs to be done once, and the time required for the molding operation can be reduced.

In addition, since the molding work only needs to be done once as described above, there is no boundary between the primary mold and the secondary mold as in the past, and the joint part of the mounting bracket with the waterproof molding material is coated with waterproof molding material. Because the chloroprene rubber is baked in, which has good bonding properties with
The waterproof mold material is less likely to peel off, so it is possible to reliably prevent water from entering the piezoelectric element, and there is also the effect of improving the appearance because there is no step difference between the primary mold and the secondary mold.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention, Fig. 2 is a side sectional view showing the same embodiment when integrally molded, Fig. 3 is a side sectional view showing a conventional example, and Fig. 4 is the same. FIG. 7 is a side sectional view of a main part of a conventional example when integrally molded. 1... Piezoelectric, 5... Cable, 8... Waterproof molding material, 12, 13... Closing plate, 15... Mounting bracket, 16... Screw hole, 17... Chloroprene rubber.

Claims (1)

[Scope of claim for utility model registration] A cylindrical piezoelectric element connected to one end of a gable, a pair of closing plates that close both ends of the piezoelectric element to ensure an air chamber within the piezoelectric element, and an external mounting part. A mounting bracket that has a screw hole at one end and the other end is directly fixed to the closing plate located on the cable side, and the waterproof molding material baked on the joint surface of the mounting bracket with the waterproof molding material. made of chloroprene rubber of good quality, and a waterproof molding material that integrally covers the outer periphery of the mounting bracket excluding the surface where the screw hole is provided, the outer periphery of the piezoelectric element whose both ends are closed by the closing plate, and the outer periphery of the end of the cable. A waterproof molded transducer featuring: