JPH0428069Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an underwater ultrasonic transducer used for measuring water depth or detecting schools of fish.

``Prior art'' As a water depth measuring device or a fish finder, a wave transmitting/receiving element made of a piezoelectric ceramic such as barium titanate or a Languevain type vibrator is liquid-tightly enclosed in an insulated outer casing, and the transceiver element is liquid-tightly sealed inside an insulated outer casing. The detection ability of an ultrasonic transducer configured to extract signals to the outside by pulling out the signal carrying cables connected to the electrode surfaces on both main surfaces of the above-mentioned wave transmitting/receiving element from a protruding small-diameter protective tube. In order to increase the speed, a speed sensor is known that includes a magnetized impeller that is held freely rotatable and a detector that is activated in response to the rotation of the impeller.

"Problems to be Solved by the Invention" The conventional underwater ultrasonic transducer equipped with the above-mentioned speed sensor is integrated with the underwater ultrasonic transducer. When one of the transducers broke down, it was difficult to repair and the entire system had to be abandoned.

"Means for Solving the Problem" An impeller magnetized to N-S poles and rotatably held on a support, and an impeller placed close to the impeller and actuated in response to the rotation of the impeller. A speed sensor consisting of a detector and a detector is manufactured separately, and this sensor is detachably attached to the outer wall of the insulating outer casing that encloses the above-mentioned wave transmitting/receiving element.

``Example'' Figure 1 shows an example of the present invention, and 1 shows the basic aspect of an underwater ultrasonic transducer. Electrode surfaces 11a and 11b are provided on both main surfaces by baking silver, etc., and polarized in the thickness direction. The electrode surfaces 11a, 1 are made of barium titanate, lead zirconate titanate, etc.
Conductors 12a, 1 of the signal carrying cable 12 are connected to 1b.
2b connected to the plate-shaped wave transmitting/receiving element 11, a vibration absorbing material 13 such as a sponge-like resin or cork that covers the outside and upper surface of the wave transmitting/receiving element 11, and an electrode surface 11b on the lower surface of the wave transmitting/receiving element 11. Vibration absorbing material 13 that extends upward from the bottom surface 14a that becomes a diaphragm by being pressed by the vibration absorbing material 13 via an adhesive (not shown) and surrounds the wave transmitting/receiving element 11.
It is formed by an insulating outer casing 14 consisting of a large-diameter body part 14b that encloses the transport cable 12, and a small-diameter protective cylinder 14c that extends further upward from the body part 14c and insulates and protects the transport cable 12. Although not shown in the drawings, as shown in Utility Model Application No. 150442/1983 (Japanese Utility Model Publication No. 59/15916), the above-mentioned protective tube 14c
In the threaded part formed above, the threaded part is inserted through a hole or notch, and a support rod fastened with a pair of tightening nuts is used to connect the threaded part with the above-mentioned large diameter to the side of the ship. The body is kept underwater.

Reference numeral 2 denotes a speed sensor, which includes an impeller 21 consisting of a plurality of blades 21a magnetized to N-S poles and a rotating shaft 21b, and a pair that rotatably supports the rotating shaft 21b of the impeller 21 from a base 22a. side plate 22b
At the outer end of the base portion 22a, there is provided a support body 22 having a large diameter body portion 14b of the insulating outer casing 14 of the underwater ultrasonic transmitter/receiver 1 and a detachable mounting portion 22a′, an electromotive device including a coil, a Hall element, etc., which is arranged close to the impeller 21 and generates an electromotive force by the rotation of the impeller 21;
Alternatively, a detector 2 equipped with a lead wire 23a that responds to changes in the magnetic field and is drawn out, such as a switching device such as a reed switch that opens and closes an electric circuit.
It consists of 3. Note that the detector 23 is connected to the support 2
2, but it may be installed between the base 22a and the impeller 21 as long as it can maintain liquid tightness. Also, in order to make the rotation of the impeller 21 accurate according to the flow velocity, a speed sensor may be installed between the base 22a and the impeller 21. 2 is attached to either the front or rear of the underwater ultrasonic transducer 1, it is preferable that the front end portion of the blade protrudes downward from the bottom surface 14a of the underwater ultrasonic transducer 1 so as to directly receive the water flow.

In addition, in this example, the speed sensor 2 can be freely attached and detached to the underwater ultrasonic transducer 1 by attaching the seat surface 142 to the side wall of the body 14b of the insulating outer casing 14 of the underwater ultrasonic transducer 1, as shown in the figure. The expanded portion 22a' formed to correspond to the dovetail groove formed at the outer end of the base 22a of the support body 22 of the speed sensor 2 is fitted into the provided dovetail groove 141 in the axial direction, and is seated therein. Although not shown in this removable attachment, a base 22a of the support body 22 of the speed sensor is attached.
The insulating casing 14 of the underwater ultrasonic transducer forms a stepped seat surface that expands at the outer end 22a' of the underwater ultrasonic transducer and comes into contact with the stepped seat surface.
Various modifications such as tightening bolts between the side wall 14b and the side wall 14b are permitted.

Figure 2 shows another example, in contrast to the example in Figure 1 in which the speed sensor is attached and detached by sliding it in the axial direction, an example in which the speed sensor is attached and detached by sliding it in the direction perpendicular to the axis is shown using the same parts as in Figure 1. A pair of supports 22 of the speed sensor 2 are attached to a tongue piece 141', which is designated by the same number and is formed by protruding a part of the body 14b of the insulating outer casing 14 of the underwater ultrasonic transducer 1. A pair of band-shaped collars 22 protruding from the outer end of the base 22a along the side plates 22b of the
Notch surface 1 where a′ is attached and detached by sliding in the direction perpendicular to the axis
41a' is formed.

"Effect of the invention" As described above, the underwater ultrasonic transducer of the invention is made of a magnetic material and includes an impeller rotatably held on a support, and a detector that responds to the rotation of the impeller. The speed sensor is detachably attached to the outer wall of an insulated outer casing that encloses a wave transmitting/receiving element made of a piezoelectric ceramic or Languevain type vibrator.
Both the ultrasonic transducer and the speed sensor are separate parts and can be manufactured separately in a simple shape, resulting in low cost, and if one of them breaks down, it can be easily replaced, eliminating the need for the entire device. Since there is no need to do this, there are excellent effects such as improving work efficiency and economic efficiency.

[Brief explanation of the drawing]

Fig. 1A is a longitudinal cross-sectional side view showing one embodiment of the underwater ultrasonic transducer of the present invention, Fig. 1B is a top view thereof, and Fig. 2A is a longitudinal cross-section showing another embodiment of the present invention. FIG. 2B is a front view from the speed sensor side. 11... Wave transmitting/receiving element, 14... Insulated outer casing, 14
b... Body, 2... Speed sensor, 21... Impeller, 22... Support, 23... Detector.

Claims (1)

[Scope of utility model registration request] an impeller 21 magnetized to S-N poles and rotatably held on a support 22; a detector 23 disposed close to the impeller 21 and activated in response to the rotation of the impeller 21; An insulated outer casing 1 encloses a speed sensor 2 consisting of a wave transmitting/receiving element 11 made of piezoelectric ceramic or the like.
An underwater ultrasonic transducer characterized in that the underwater ultrasonic transducer is detachably attached to the outer wall of the body section 14b of No. 4.