JPH0617433Y2 - Underwater ultrasonic transducer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to an underwater ultrasonic transducer for low frequencies.

[Conventional technology]

Conventionally, this type of underwater ultrasonic transducer has a structure in which a ring-shaped transducer is placed inside a reflector having a parabolic mirror-like reflecting surface. Generally, a transducer with a frequency of 15 KHz or less is hung from the port side of the ship. It was fixed down and used, and it was used to detect buried objects under the sea floor or rock layers hidden under the mud floor.

[Problems to be solved by the device]

There are various detection targets, so you can change the detection frequency,
Alternatively, it is necessary to change the aperture in the direction of transmission / reception to obtain the best condition. However, in the past, there was no single transmitter / receiver taking such a consideration, and detection was performed in an unsuitable situation, or a plurality of transmitters / receivers were prepared. Especially for high-frequency ones, the shape of the vibrator was different, so they were configured as separate transducers.

An object of the present invention is to provide an underwater ultrasonic transducer having a structure in which a single transducer can be used for various detection purposes.

[Means for Solving the Problems]

The underwater ultrasonic transducer according to the present invention has a structure in which a waterproof molded ring-shaped transducer is disposed on the axis of a reflective concave body having a parabolic mirror-shaped reflective surface. And, on the back surface of this reflective concave body, a protective body which is made of wood in the shape of an inverted mortar and is waterproof and functions also as a float is arranged in the middle with a reflective material layer, and the above-mentioned reflective concave body / reflective material layer is provided.・ The protective body is protected from the upper side by the upper support body. Each of the above parts has a supporting shaft body penetrating each part at the center of the center axis, and a wave transmitting / receiving element body formed by waterproof molding of a ring-shaped vibrator is provided in the center hole of the supporting shaft body near the lower end thereof. It can be moved up and down through the and fixed in place. The lower portion of the support shaft is held by the lower support, and the lower support fixes the other ends of the plurality of skeletons radially extending from the support to the open ends of the reflecting concave body. Further, the support shaft body is structured such that it can be freely removed by being fastened with screws to the upper support body, the lower support body, and the wave transmitting / receiving element body, respectively. In this way, the upper support and the lower support fix the main part of the transducer, and the upper support is hung and fixed on the port side of the ship.

Further, if necessary, a wave transmitting / receiving element body formed by molding a disk-shaped vibrator of high frequency is housed in the lower portion of the lower support, and a box body is attached.

[Action]

In this structure, each part is detachably assembled so that the wave transmitting / receiving element body can be detached from the supporting shaft body to be fitted and replaced. Further, the oscillator moves on the support shaft and is fixed at a predetermined position, so that the aperture for transmitting and receiving waves can be changed. If a search by high frequency is required, a box housing the high frequency wave transmitting / receiving element body is attached, and it is removed when unnecessary.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 4 and 5 are front external views, in which FIG. 4 shows the case where the housing 9 for housing the high frequency wave transmitting / receiving element body is provided, and FIG. 5 shows the case where only the low frequency wave transmitting / receiving element body is provided. is there. Further, FIG. 6 is a perspective view of the embodiment of FIG. 4 as seen from below.

1 and 2 are exploded perspective views of the main body and the housing for the high-frequency wave transmitting / receiving element body, and FIG. 3 is a sectional view of the assembled state. In this embodiment, for example, a stainless steel pipe tubular body is used for suspending the ship. In FIG. 1, a supporting rod 1 is a tubular body for suspending a ship, a through hole 1A for passing a cable 6E and a cable 10C described later is provided, and the supporting rod 1 is combined with a fixture 2 at its tip. There is.

The fixture 2 is an upper support for holding the upper part of each part, is made of a corrosion-resistant aluminum alloy, and has a rod hole 2A into which the rod 1 is incorporated and a mandrel (supporting shaft) 3 described below. A cylindrical portion 2M having a central hole that is connected to the hole 2B is fixedly provided with a flange portion 2L for holding a reflective concave body, which will be described later, and is reinforced by a support plate 2C. For example, a bush 2F made of Delrin material is provided to prevent obstruction of the mandrel 3 from being removed due to adhesion of contaminants in water. In addition, a screw hole 2D and a screw hole 2J are provided in the abdominal portions of the support rod hole 2A and the mandrel hole 2B, respectively.
And the screw hole 2J can fix the lower part of the pole 1 and the set screw 2E and the screw hole 2D to fix the upper part of the mandrel 3, and the flange portion 2L has a hole 2I on the center side and a mounting hole 2G on the outer peripheral side. A cable 6E and a cable 10C, which will be described later, are passed through one of the holes 2I, and the other is also used as a weight reduction and a water passage hole. The mounting hole 2G has a fixture 2 and a tree umbrella 4 described later. The reflective concave body 5 is integrally assembled with the set screw 2H.

The mandrel 3 is a support shaft body that supports the wave transmission / reception element body 6 described later,
It is a corrosion-resistant aluminum rod or tube, and a stopper collar 3A is provided at the upper end to prevent the stopper collar 3A from falling out.

The umbrella 4 has the purpose of blocking incident sound waves from the rear side of low frequency noise and reducing the Q of the reflector itself, and also serves as a float for reducing the underwater weight by protecting the reflective concave body 5 described later. The protective body is formed by stacking wood plywood into a conical shell 4A and a disk-shaped portion 4B that are continuous in a reverse mortar shape, and subjected to waterproofing treatment such as urethane resin coating. A central hole 4C is provided in the center of the portion 4B to allow the cylindrical portion 2M and the cable 6E and the cable 10C described later to pass therethrough, and also serves as a water passage hole. The conical shell portion 4A is provided with a water passage hole 4E for use. In addition to improving drainage at the time, a reflective sponge layer Z1 of a single-foam sponge material is attached to the lower surface of the disk-shaped portion 4B to provide a sound wave reflective layer and a tightening cushion between the umbrella 4 and the reflective concave body 5. Also, the reflective sponge layer Z1 and the disk-shaped portion 4
A through hole 4D for the set screw 2H is provided through B and B.

The reflecting concave body 5 is a reflecting concave body having a reflecting surface R in the shape of a parabolic mirror. The reflecting concave surface 5 has a focal point F of the reflecting surface R on the opening surface of the parabolic mirror plate 5A formed by spatulating a thin plate of corrosion-resistant aluminum. A reflective surface is formed, and a ring-shaped rim 5D having an L-shaped cross section is fixed and reinforced on the outer periphery of the opening end 5F, and a mounting rib 5B having a circular flat surface portion is fixed on the back side. The mounting surface is formed and also serves as a reinforcement, and the circular plane portion of the mounting rib 5B has a screw hole 5C for the set screw 2H.
Is provided.

Further, the central hole 4C of the wooden umbrella 4 is provided at the center of the parabolic mirror plate 5A.
A central hole 5E having substantially the same diameter as that of the above is provided, and a reflective sponge layer Z2 and a reflective sponge layer Z3 of a single-foam sponge material are attached to the rear surface to provide a reflective material layer.

The transmitting / receiving element body 6 has a ring-shaped vibrator 6A for transmitting / receiving a plurality of ultrasonic waves having a low frequency of, for example, 15 KHz or less.
The outer peripheral surface of the vibrator 6B is used as a wave transmitting / receiving surface, and the reflective cork layer 6F / reflective cork layer 6G is provided on the other surface to form a waterproof structure with a molded body 6D such as polyurethane resin, and the conductors of the vibrator 6A and the vibrator 6B are connected. A mandrel hole 6C that extends through the mandrel 3 is provided at the center of the cable 6E and is integrally formed. A screw hole 6H is formed in the upper boss portion, and the mandrel 3 is fixed to the mandrel 3 by a set screw 6I.

The fixture 7 is a lower support for holding the lower part of each part, is made of a corrosion-resistant aluminum alloy, has a mandrel hole 7A for assembling the mandrel 3 in the upper part, and a stay (not shown) radially on the side. A stay hole 7E for assembling 8 is provided,
A bush 7D is provided in the mandrel hole 7A similarly to the bush 2F, a screw hole 7B is provided in the abdomen of the mandrel hole 7A, and the mandrel 3 is fixed by a set screw 7C. Further, a screw hole 7F for mounting a housing 9 described later is provided on the lower end surface portion.

The stays 8 are a plurality of skeletal bodies for holding the fixture 7 on the axis of the reflecting surface R of the reflecting concave body 5, and the diameter thereof is as small as possible compared to the underwater wavelength of the transducer 6A, for example, 1/8 wavelength. It is made of the following stainless steel or corrosion-resistant aluminum alloy rods or tubes, and is crushed at one end to form a strip-shaped mounting hole 8B.
After mounting the other end into the stay hole 7E and fixing it to the fixture 7 with the fixing pin 8A, the mounting hole 8B and the mounting hole 5 are provided.
The parabolic mirror plate 5A, the rim 5D, and the reflection sponge layer Z3 are fixed to the open end 4F of the wooden umbrella 4 by a set screw 8C through G.

By assembling the respective parts shown in FIG. 1 in order with a set screw, the transducer including the housing 9 accommodating the high frequency element body of the assembly state diagram of FIG. 3 is configured, and the appearance and appearance shown in FIG. Become. Assembling procedure is as follows: Fixture 2, Umbrella 4, Reflective concave body 5 (Reflective material layer is attached to the back surface)
Is integrated by screwing the set screw 2H into the screw hole 5C of the reflecting concave body 5 through the mounting hole 2G and the through hole 4D.

Next, the mandrel 3 and the supporting rod 1 are pushed into the mandrel holes 2B and 2A of the fixture 2, and the upper part of the mandrel 3 and the lower part of the supporting bar 1 are fixed by the setscrews 2E and 2K, respectively. At this time, the mandrel 3 is fixed to the upper end with the position set by the stop collar 3A.

Next, the wave transmitting / receiving element body 6 is placed below the mandrel 3 and the mandrel hole 6
Fit through C and fix to the axial center of the opening surface with a set screw 6I. In this state, the cable 6E is guided to the through hole 1A provided on the side surface of the upper rod 1 as shown in FIG. Then, the lower end of the mandrel 3 is fixed in the mandrel hole 7A of the fixture 7 with the set screw 7C, and then the tip of the skeleton body 8 is fixed to the open end 4F of the wooden umbrella 4 with the set screw 8C.

As a second embodiment, a case of mounting a high frequency wave transmitting / receiving element body will be described. At this time, a box body for accommodating the wave transmitting / receiving element body formed by molding the disk-shaped vibrator is attached to the fixture 7. 2 is a sectional view of a box (housing), FIG. 3 is a sectional view showing a state in which the box is mounted, and FIG. 4 is an external view.

The housing 9 is a box body that also holds and protects the wave-transmission / reception element body 10 described later, is made of a corrosion-resistant aluminum alloy, and has a mounting concave surface 9A that is in contact with the lower surface of the fixture 7 upward and a wave-transmission / reception element body downward. A stepped vibrator hole 9B for accommodating 10 is provided, and a mounting hole 9C is provided in the upper end plate portion to be fixed to the fixture 7 by a set screw 9D and a screw hole 7F. Further, a through hole 9E for penetrating a cable 10C described later is formed in the peripheral waist portion, and a push plate 1 described later is formed in the lower annular end surface portion.
A screw hole 9F for attaching 1 is provided.

The wave transmission / reception element body 10 is a wave transmission / reception element body for transmitting / receiving an ultrasonic wave having a high frequency of, for example, 100 KHz or more. The lower surface of the disk-shaped vibrator 10A is used as a wave transmission / reception surface, and the reflection cork layer 10B is provided on the other surface. A waterproof structure is formed by a molded body 10D of polyurethane resin or the like, the conductor wire of the vibrator 10A is led out to the cable 10C, and a peripheral edge paragraph 10E of the lower end surface is provided so that the lower end surface of the wave transmission / reception element body 10 has a pressing plate 11 described later. Matches with or projects from the underside of the.

The pressing plate 11 is a ring-shaped flat plate body for housing and fixing the wave transmitting / receiving element body 10, is made of a corrosion-resistant aluminum alloy, and has a window hole 11C for passing the paragraph portion 10E at the center, and a plate surface portion. The wave transmitting / receiving element body 10 is fixed to the housing 9 while providing the mounting hole 11A and pressing the paragraph portion 10E with the set screw 11B.

The embodiment is a case where a transducer having a plurality of frequencies is used as the wave transmitting / receiving element body 6. In this case, as shown in FIG. The child 6A is arranged on the upper side so that the sound wave reflection paths X1 and X2 of the vibrator 6A are not affected by the vibrator 6B as shown in FIG.

[Effect of device]

 The present invention has the following effects.

(1) The wave transmitting / receiving element body can be set at an arbitrary position on the shaft center in the reflecting concave body by passing the supporting shaft body (the mandrel 3) through the center hole provided at the center thereof. As a result, with the outer diameters D1 and D2 (Fig. 3) of the downward wave transmitting / receiving surface as a desired diameter, the downward wave transmitting / receiving directivity angle can be adjusted to desired values such as the purpose of use, detection depth, and detection area. it can.

(2) Remove the support rod 1 from the upper support (fixture) 2, operate various setscrews to screw the mandrel 3 and pull out the mandrel 3 upward, and then the wave transmitting / receiving element body 6 is set to a desired frequency. It is possible to change it at any time according to the purpose of use, such as that of a single frequency oscillator having a wide wave receiving area (high height).

(3) When it is desired to detect a soft bottom surface such as a sludge at a particularly high frequency, for example, 100 KHz or more, the box body (housing 9) can be simply attached to the tip of the lower support (fixture 7).

[Variation of device]

 This invention can be modified as follows.

(1) A plurality of wave transmitting / receiving element bodies 6 are fitted on the mandrel 3 for use.

(2) Z2 and Z3 are not layered, but chopped pieces are attached, or this is packed in the space between the wooden umbrella 4 and the reflective surface body 5 to form the reflective back surface.

(3) The fixture 7, the housing 9, the wave transmitting / receiving element body 10, and the push plate 11 are deformed as shown in FIG. 7 so that they can be removed only by operating the set screw 9D from the outside.

(4) A hook is provided on the flange portion 2L of the fixture 2 without using the support rod 1, and a rope is attached to the hook to support the hook. in this case,
An appropriate lid is provided on the upper opening of the cylindrical portion 2M to support the rod hole 2A.
Do not let sludge enter inside.

[Brief description of drawings]

The drawings show examples, and FIG. 1 is an exploded sectional view of the main body,
FIG. 2 is a sectional view of an exploded state of a housing accommodating a high-frequency wave transmitting / receiving element body, FIG. 3 is a sectional view of an assembled state in which the housing is added, FIG. 4 is a front view of the assembled appearance, and FIG. 6 is a perspective view thereof. It is a figure. FIG. 5 is a front view of the external appearance of the assembly in which the housing is not added, and FIG. 7 is a cross-sectional view of the housing having another shape, showing the assembled state. 1 ... Support rod, 2 ... Fixing device (upper support body), 3 ... Mandrel (support shaft body), 4 ... Wooden umbrella (protection body), 5 ... Reflective concave body, 6 ... Transducing / receiving element Body, 7 ... Fixing device (lower support), 8 ... Stay (supporting body), 9 ... Housing, 10 ... Wave transmitting / receiving element body, 11 ... Push plate, X1, X2, X3, X4 ... … Sound wave reflection path.

Claims (2)

[Scope of utility model registration request] 1. A low-frequency underwater ultrasonic transducer in which a wave transmitting / receiving element is arranged in a parabolic mirror-shaped reflecting concave surface, wherein (a) wood is formed into a reverse mortar shape and is waterproofed. A protective body that also serves as a float, (b) a reflective concave surface body that is disposed below the protective body, and has a reflective surface in which a thin plate of a corrosion-resistant aluminum alloy is formed into the parabolic mirror shape, and (c) the protective body A reflecting material layer provided in the middle of the reflecting concave body, (d) a flange portion for holding the protective body and the reflecting concave body together, and a cylindrical portion for holding a support shaft described later. An upper support having, (e) a support shaft body that penetrates the cylindrical portion and is held at the axis of the reflective surface of the reflective concave surface body, and (f) a central hole for fitting into the support shaft body. By providing a ring-shaped oscillator with a waterproof mold, the support shaft can be moved up and down and fixed at a predetermined position. A wave element body, (g) a lower support body that holds the support shaft body, and is held at the axial center of the reflection surface of the reflection concave body body by a skeletal body described later, and (h) one end of the lower support body. Fix it and project it radially.
A plurality of skeleton bodies, the other ends of which are fixed to the open ends of the reflecting concave body, and the supporting shaft body is fastened to the upper support body, the lower support body, and the wave transmitting / receiving element body by screws. An underwater ultrasonic transducer that can be freely removed. 2. The underwater ultrasonic transducer according to claim 1, wherein the utility model is registered, wherein a transducer element having a high frequency disc-shaped oscillator is molded under the lower support. An underwater ultrasonic wave transmitter / receiver in which a box containing a can be attached freely.