close

Вход

Забыли?

вход по аккаунту

?

JPH07327293

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH07327293
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transmits an
ultrasonic wave into a liquid and receives an ultrasonic pulse reflected from a reflector as a
sensor of an apparatus for measuring distance in a liquid (usually water or seawater). Waterproof
structure of an ultrasonic transducer (hereinafter referred to as "transducer").
[0002]
2. Description of the Related Art FIG. 5 shows an example of a conventionally used transducer. 5
(a) is a top view of the transducer 1, and FIG. 5 (b) is a cross-sectional view taken along the line
E-E of FIG. 5 (a). Such a transducer is widely used, for example, as a sensor of an ultrasonic
berthing speed meter. In FIG. 5, 1 is a transducer, 2 is a vibrator, and a lead titanate-based or
PZT-based piezoelectric element is often used as its material. A holder 4 holds the vibrator 2. A
groove 5 through which a lead wire 9-2 described later passes is provided at one point on the
inner periphery of the holder 4. The holder 4 is usually manufactured using a phenolic resin as a
material. 6 is a backing material which has an acoustic impedance close to that of air (0.004 ×
10 5 Kg / (m 2 · s)) and which does not restrict the vibration of the vibrator 2, eg, cork powder
against epoxy resin 5 The mixture molded at a mass ratio of 3 is used.
[0003]
04-05-2019
1
The vibrator 2 is fixed to the upper surface of the holder 4 with an adhesive, and the lower
electrode (not shown) of the vibrator 2 and the central conductor of the coaxial cable 8 are
connected by the lead wire 9-1 to lead wire 9-2. Thus, the upper surface electrode (not shown) of
the vibrator 2 and the outer conductor of the coaxial cable 8 are connected. The backing material
6 is injected into the recess formed by the vibrator 2 and the holder 4. As a result, the vibrator 2,
the holder 4, the backing 6, and the coaxial cable 8 are integrally formed. 10 is a case and 11 is a
cable waterproofer, both of which are integrally formed and manufactured mainly of a corrosion
resistant material such as stainless steel. The cable waterproofer 11 is for preventing water from
entering from the coaxial cable outlet. The cable waterproofing device is a widely used and wellknown component and is not related to the present invention, so the description is omitted. The
coaxial cable 8 is drawn from the inside of the case 10 to the outside through the cable
waterproofer 11, and the tip of the vibrator 2, the support 4, the back member 6 and the coaxial
cable 8 assembled into an integral structure as described above Store and fix with adhesive.
[0004]
An acoustic matching plate 3 performs protection of the front surface of the transducer and
acoustic impedance matching between the transducer and water (a propagation medium of
ultrasonic waves). The acoustic impedance of the acoustic matching plate needs to be
approximately equal to the geometric mean value of the acoustic impedance of the vibrator and
the acoustic impedance of water, and is usually manufactured by curing and forming an epoxy
resin. The coaxial cable 8 connects the transducer to the main body of a measuring device (for
example, a wharf speed meter) not shown. The output of the measuring apparatus body for
exciting the transducer 2 of the transducer and the echo signal received and converted into an
electrical signal by the transducer are transmitted by this cable.
[0005]
However, in such a conventional transducer, when used in liquid for a long period of time, the
expansion coefficient of case 10 every time the temperature rises and falls. Because the stress is
generated at the boundary 13 of the two due to the difference between the expansion coefficient
of the acoustic matching plate 3 and the adhesive, the adhesion at the boundary 13 may be
broken. Then, the liquid penetrates from the breaking point. In this case, there is a problem that
shorting the upper and lower electrodes of the vibrator 2 particularly if the liquid is a conductive
liquid such as seawater, making transmission and reception of ultrasonic waves by the vibrator
impossible.
04-05-2019
2
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above
problems, and has an O-ring, an acoustic matching plate, a case, and a protective plate for
compressing the O-ring. It is an object of the invention to solve the above-mentioned problems by
using a characterized ultrasound transducer. Alternatively, the above problem is caused by using
an ultrasonic transducer having an acoustic matching plate, a case, and an O-ring, wherein the Oring is compressed by the acoustic matching plate and the case. To solve the problem.
[0007]
[Operation] The O-ring disposed on the front of the transducer is compressed between the
protective plate and the front surface of the acoustic matching plate or the case so that the
ultrasonic wave propagation medium (liquid) is the acoustic It is possible to prevent contact with
the interface between the alignment plate and the case. Alternatively, the O-ring disposed at the
interface between the case of the transducer and the acoustic matching plate is compressed by
being sandwiched between the acoustic matching plate and the case, so that the ultrasonic wave
propagation medium (liquid) Can be prevented from intruding inside the O-ring at the interface.
[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, an embodiment
of a transducer according to the present invention will be described. FIG. 1 (a) is a top view of the
transducer 20, and FIG. 1 (b) is a cross-sectional view taken along line A-A of the top view (a) of
FIG. In FIG. 1, 2 to 14 are the same as the constituent elements of the same reference numerals in
FIG. It is necessary that the ultrasonic wave transmitting / receiving surface 12 of the acoustic
matching plate 3 and the case front surface 14 be in the same plane. In FIG. 1, 21 is a protective
plate, 22 is a hole formed in the protective plate 21, 23 is a square ring groove A, 24 is a square
ring groove B, 25 is an O ring A, 26 is an O ring B, 27-1 , 27-2 and 27-3 are screws.
[0009]
The O-ring A 25 is disposed outside the boundary 13 between the case 10 and the acoustic
04-05-2019
3
matching plate 3, and the O-ring B 26 is disposed concentrically with the vibrator 2 and the
acoustic matching plate 3 inside the boundary 13. The inner diameter of the O-ring A25 and the
outer diameter of the O-ring B26 need to be values that allow the above-mentioned arrangement.
[0010]
The protective plate 21 is a disk having the same outer diameter as the case 10, and a hole 22
having a diameter somewhat larger than the outer diameter of the vibrator 2 is formed at the
center. The holes 22 allow the ultrasonic wave transmission / reception wavefront 12 to directly
contact the ultrasonic wave propagation medium (liquid) to transmit and receive ultrasonic
waves. Further, on one surface of the protective plate 21, rectangular ring-shaped rectangular
grooves A23 and B24 for housing the O-ring A25 and the O-ring B26 are provided. The depth of
each of the rectangular grooves A23 and B24 is manufactured to be about 85% of the thickness
of the O-ring to be accommodated. Further, the protective plate 21 has holes (not shown) for
passing a plurality of (three in the example of FIG. 1) screws 27-1, 27-2 and 27-3 for fixing the
protective plate 21 to the case 10. It is open. The case front face 14 is provided with female
screw holes (not shown) screwed with the screws 27-1, 27-2 and 27-3 at positions
corresponding to the holes.
[0011]
As described above, the protective plate 21 is placed on the case front surface 14 so that the Oring A25 and the O-ring B26 arranged across the boundary line 13 can be accommodated in the
rectangular grooves A23 and B24, respectively. Then, the protective plate 21 is crimped to the
front surface 14 of the case 10 by the screws 27-1, 27-2, and 27-3. The O-ring A25 and the Oring B26 are compressed in the rectangular grooves A23 and B24, respectively, so that no liquid
penetrates between the two O-rings. That is, the liquid can be prevented from invading from the
boundary line 13. In FIG. 1, the same effect can be obtained by providing the square grooves A23
and B24 not on the surface of the protective plate 21 but on the front surface 14 of the case 10
and the ultrasonic wave transmission / reception 12 of the acoustic matching plate 3.
[0012]
FIG. 2 is a view showing another embodiment of the present invention. The figure (a) is a top
04-05-2019
4
view of the transducer 30, (b) is a B-B line sectional view of the top view (a) of the figure. In FIG.
2, 2 to 14 and 27-1 to 27-3 are the same as the components having the same reference numerals
in FIG. However, a V-shaped groove 32 is provided on the ultrasonic wave transmitting /
receiving surface 12 of the acoustic matching plate 3 and the case front surface 14 with the
boundary line 13 between them as a center. Further, as in FIG. 1, the ultrasonic wave
transmitting / receiving wavefront 12 of the acoustic matching plate 3 and the case front surface
14 need to be in the same plane.
[0013]
In FIG. 2, 31 is a protective plate, 22 is a hole drilled in the protective plate 31, and 33 is an Oring. The action of the holes 22 is the same as the action of the holes 22 drilled in the protective
plate 21 of FIG. The opening angle of the V-shaped groove 32 is about 90 °, and the depth
thereof is made to be substantially equal to the thickness of the O-ring 33 to be accommodated.
The O-ring 33 is housed in the V-shaped groove 32, and the protective plate 31 is put on the Oring 33, and the protective plate 31 is fixed to the case front surface 14 by the screws 27-1 to
27-3. Since the O-ring 33 is compressed by the side surface of the V-shaped groove 32 and the
bottom surface of the protective plate 31, the liquid does not enter from the boundary line 13.
[0014]
FIG. 3 is a view showing another embodiment of the present invention. The figure (a) is a top
view of the transducer 40, (b) is a cross-sectional view taken along the line C-C of the top view (a)
of the figure. In FIG. 3, 2 to 14 are the same as the constituent elements of the same reference
numerals in FIG. However, a square groove C 41 for housing the O-ring 42 is provided on the
inner side surface of the case 10. The depth of the rectangular groove C41 is about 85% of the
thickness of the O-ring 42. Further, the manufacturing position of the rectangular groove C41 is
set to about half of the thickness of the acoustic matching plate 3 from the case front surface 14.
Furthermore, the acoustic matching plate 3 is manufactured integrally with the vibrator 2, the
holding body 4, the backing material 6 and the like. The outer diameter of the acoustic matching
plate 3 is made to fit with the inner surface of the side of the case 10.
[0015]
After the O-ring 42 is housed in the rectangular groove C41, the acoustic matching plate 3, the
04-05-2019
5
vibrator 2, the holder 4 and the backing 6 and the like which are integrally manufactured are
housed in the case 10 and fixed with an adhesive. At this time, the ultrasonic wave transmission /
reception 12 of the acoustic matching plate 3 and the case front surface 14 are made to be
substantially flush with each other. The O-ring 42 is compressed by the bottom surface of the
rectangular groove C 41 and the side surface of the acoustic matching plate 3, so that liquid does
not enter inside the O-ring at the boundary line 13. In FIG. 3, the same effect can be obtained by
providing the square groove C 41 not on the inner side surface of the case 10 but on the side
surface of the acoustic matching plate 3.
[0016]
FIG. 4 is a view showing another embodiment of the present invention. The same figure (a) is a
top view of transducer 50, and (b) is a DD line sectional view of the upper view (a) of the figure.
In FIG. 4, 2 to 12 and 27-1 to 27-3 are the same as the components having the same reference
numerals in FIG. However, the front surface 14 of the case 10, the front surface of the transducer
2 (the ultrasonic wave transmitting and receiving wave surface of the transducer), and the front
surface of the holder 4 are manufactured to be in the same plane. The acoustic matching plate 3
is manufactured so as to cover the front surface 14 of the case 10, the front surface of the
vibrator 2 and the front surface of the holder 4. Furthermore, a square groove D43 for housing
the O-ring 44 is provided on one surface of the acoustic matching plate 3, and a plurality of
(three in the example of FIG. 4) screws 27 for fixing the acoustic matching plate 3 to the case 10.
Holes (not shown) are drilled through -1, 27-2 and 27-3. The front surface 14 of the case 10 is
provided with a female screw hole (not shown) screwed with the screws 27-1, 27-2 and 27-3 at a
position corresponding to the hole.
[0017]
An O-ring 44 disposed on the front of the case 10 covers the acoustic matching plate 3 so as to
be accommodated in the rectangular groove D43. Then, the acoustic matching plate 3 is fixed to
the front surface 14 of the case 10 by the screws 27-1, 27-2, and 27-3. Since the O-ring 44 is
compressed in the rectangular groove D 43, the liquid that has entered from the boundary 45
between the front surface of the case 10 and the transducer side surface of the acoustic
matching plate 3 does not penetrate from the O-ring 44 inside. In FIG. 4, the effect is the same
even if the rectangular grooves D 43 are provided not on the surface of the acoustic matching
plate 3 but on the front surface 14 of the case 10.
04-05-2019
6
[0018]
According to the present invention, ultrasonic waves are generated from the boundary between
the case of the transducer and the acoustic matching plate by a simple modification to add an Oring and a protective plate to the transducer or by the addition of an O-ring and a simple
processing addition of some parts. The penetration of the medium (liquid) can be prevented, and
the reliability of the transducer can be greatly improved.
04-05-2019
7
Документ
Категория
Без категории
Просмотров
0
Размер файла
16 Кб
Теги
jph07327293
1/--страниц
Пожаловаться на содержимое документа