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JPS5340226

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DESCRIPTION JPS5340226
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of an
ultrasonic wave source according to the present invention, FIG. 2 is a front view showing another
embodiment, and FIG. 3 is a horn, vertical 41kI is an enlarged sectional view showing in detail
the connection between the rectangular diaphragm, the connecting rod, and the sound source
case in the embodiment shown in FIG. 1; 4 is an enlarged cross-sectional view of a part of FIG. 4
I, and FIG. 5 is an enlarged cross-sectional view showing in detail the connection between
longitudinal resonance rods and connecting rods in the embodiment shown in FIG. FIG. 6 is an
enlarged cross-sectional view showing a modification of the longitudinal resonance rods in FIG. 5
and the connecting state of the connecting rods, and FIG. 1 is a side view showing the positional
relationship between the horn or the longitudinal resonance rods and the fixing member with
respect to the diaphragm. FIG. 8 is a front view showing an ultrasonic sound source used in the
experiment. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·. · Thick end, 6a, 6b · · · · · · · · · · · · · · · · · · · · · · · · · ·
narrow end, 8at 8bt 8c · · · · · · · · · · · · · · · One end, 10 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Natsuto, 15-17, 25-2 · · · · · · · · · Connecting rod,
18a, 18b "" fixing member, 19as 19b-· · · · · ·, projection 20at 20b? 31.34at34b。 34c,
32 · · · · · · · · Screw holes, 21a, 21b · · · · · · · Through holes, 22at 22bt 33a, 33bt 33c · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · One end of the connecting rod 17, 29 · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of ultrasonic sound sources, particularly airborne supersonic wave sound sources for the purpose
of dust collection, drying, etc., more specifically, the cracks of the diaphragm used for the abovementioned line source It relates to the device to prevent. The present inventors are particularly
interested in the process of practical application of ultrasonic sound sources used for purposes
such as removal of fumes, drying and drying of articles avoiding high temperature, and
communication applications where radio wave interference should be prevented. Found. l) In
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order to obtain a strong field, it is necessary to increase the area and amplitude of the
diaphragm. Here, when the frequency is constant, the sound pressure level increases with the
increase of the vibration amplitude of one diaphragm, but the increase of the amplitude is limited
due to the fatigue strength of the diaphragm. (2) 2) With the same area and the same amplitude,
the rectangular diaphragm can obtain stronger air-neutralized sound waves than the circular
diaphragm. 3) A rectangular diaphragm that produces fringed moats (frequently spaced stripes)
with the same ring input, but emits radiation for the same electrical input as compared to those
that produce other modes. Efficiency is the best. 4) In the case of a rectangular diaphragm which
produces a fringe mode, the sound pressure level is saturated when the area of the diaphragm is
a certain value or more. 5) A strong sound field can be easily obtained by increasing the number
of sound sources, that is, the number of diaphragms. On the basis of the findings described by
the present inventors, the present inventors have constructed a diaphragm which constitutes a
part of an ultrasonic sound source, and a rectangular plate which is dimensioned to produce a
perfect fringe mode, and Three or four rectangular diaphragms with the above dimensions are
attached to a horn or a longitudinal vibrating bar connected to the tip of the horn in multistages
at regular intervals to generate ultrasonic waves of audio frequency or higher, and no noise In
addition, a high-power ultrasonic sound source (3) -1> 1 having a high radioactivity rate has
already been provided (Japanese Patent Application No. 51-88286.51-8331'l). However, in the
ultrasonic source having the above configuration, when a large amplitude is given to the
diaphragm, both ends in the longitudinal direction of the diaphragm exhibit particularly large
amplitude, and as a result, fatigue cracks occur in the peripheral portion of the diaphragm. It has
the drawback of The present invention seeks to provide an apparatus for preventing the abovementioned crack of the diaphragm. That is, the present invention is intended to prevent the shake
of the both ends by supporting the both ends of the diaphragm with any support without
completely free state. In this case, the vibration of the diaphragm should not be inhibited by
supporting both ends of the diaphragm. In other words, the support is not allowed to disturb the
vibration of the diaphragm. Therefore, the present invention considers that the support does not
suffer from the vibrational disturbance of the diaphragm5, ie, the present invention uses the
connecting rod as the support and the connecting (4) rod and the diaphragm In other words, the
connecting rod or the diaphragm is matched by matching the connecting portion with the nodal
portion of the stripe mode in the vicinity of both ends of the diaphragm and by making the
contact area between the connecting rod and the diaphragm small. If you have any trouble with
vibration.
The connecting rod is connected to the diaphragm L1 <, one of which is connected to the
diaphragm, and the other is connected to the sound source case and connected to the vertical
resonance rod itself, so that both ends of the diaphragm are connected via the connecting rod.
Support. One of the connecting rods described above may be connected to the diaphragm, and
the other may be connected to the sound source case in an interview, or a plurality of
diaphragms may be supported by one connecting rod each other, The connecting rod may be
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connected to one of the other connecting rods, and the other of the other connecting rods may
be connected to the longitudinal resonance rod in the sound source case. The connection point
between the diaphragm and the connecting rod is the width center line of the diaphragm, and
from the both ends of the diaphragm, the stripe mode in the range of 1⁄8 to 1⁄8 of the total
length of the diaphragm [1 + 1 It is good to be in the section of the At the L connection point, a
pair of fixing members with a small (5) contact surface are provided at both ends of the
connecting rod, and the diaphragm is held by the fixing members [7] It is preferable to do.
Hereinafter, the present invention will be specifically described with reference to an embodiment
illustrated in the drawings. FIGS. 1, 3 and 4 show a first embodiment. In the figure, ▪ indicates
the entire ultrasonic sound source. 2 is a sound source case, 3 is an exponential horn fixed
through one side of the sound source case 2 and fixed, 4 is a vibrator 5a fixed to the large end 5
of the ho 78, 5b is a horn 3 The longitudinal resonance rods 8a, 8b and 8c connected in the
extension direction are fixed to the position of the antinodes of the horn 3 and the longitudinal
resonance rods 5a and 5b with rectangular diaphragms, respectively. Thus, the vibrations of the
vibrator 4, the horn 3 and the longitudinal resonance rods 13a, 6b are most efficiently
transmitted to the diaphragms 8a, 8b, 8C. The diaphragms 8a, 8b, 8 (and the shaft of both the ho
73 and the one llk (connected with ia, 6b are shown in FIGS. 1 and 31 in the figure). (6) That is,
while the thin end 7 of the horn 3 and one end 9 of the longitudinal joint withdrawal rods 6a and
6b are formed on the male screw 10, the other end 11 of the longitudinal resonance rod (ia, 6b is
the female screw 12 and 1-1 vibration & 8a, 8b, 8C, respectively, in the hole 13 opened at the
center, fit the male screw 10 and tighten the male screw 10 and the female screw 12 or nut 14
to longitudinally resonate the horn 3 in parallel! Each of the diaphragms 3a, 3b and 3c is fixed at
62 ° 6b so as to be parallel to each other. In the figure, reference numerals 15 to 17 denote
connecting rods, which are provided so as to support the vicinity of both end portions of the
respective diaphragms 8a, 8b and 3c. At one end of the connecting rod 15.16, a pair of fixing
members 18a, 18b are provided at positions I connected to the diaphragms 8a, 8b, 8c,
respectively.
This will be described in detail in accordance with FIG. 4 (Il 1111+, the fixing members 18a, 18b
respectively have projections 19a having a smaller number of contact surfaces on the side which
abuts on the surface of each of the vibrators 8a, 8b, 8 ( It has 19b. A connecting rod 15.16 is
coupled to one of the fixing members 18b, and the pair of fixing members tsa and tsb (7) are
respectively provided in respective pairs of screw holes 20b and 20a and diaphragms 3a, gb and
3c. By screwing the screws 22a and 22b into the pair of through holes 21a and 21b respectively
provided, they are tightened to thereby hold the diaphragms 8a, 3b and 3c between the pair of
fixing members 18a and 18b. I have to. The other end of the connecting rod 15 supporting the
diaphragm 8 a is directly fixed to the sound source case 2 by −nut 23. On the other hand, the
diaphragms 8b and 8C are connected to each other by the connecting rod 16, and the connecting
rod 16 is fixed to one end 24 of the other connecting rod 17, and the other end or the sound
source case 2 is nut 23 It is fixed by. As noted, the connecting rod 15.16 is the diaphragm 3a via
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the respective fixing members 18a, 18b. It is connected in the vicinity of both ends of each of 8b
and 8C, but as a result of the experiment, the connection point is in the center 10-01 character
insertion of each of diaphragms 8a, 8b and 8C as shown in FIG. It has been found that it is most
preferable to match the nodes S of the fringes (8) -d within the range of 1⁄6 to 1⁄8 of the total
length of the diaphragm from the ends of the diaphragm respectively. The In other words, when
the connection point is matched with a point other than the nodes of the stripe mode, not only
the large vibration of the diaphragm can not be prevented but it causes a vibration disturbance of
the diaphragm. Even at the nodes of the streaked mode, at 1111 closer to the center than the
above range, the effect of preventing a large shake at both ends of the diaphragm can not be
expected so much, and conversely, the above. If it is on the difference side from the center of the
mound, it will also be a vibration disorder. In the first embodiment described above, the vicinity
of the li + 11 end of the diaphragm is connected to and supported by the source case 2 through
the connecting rod, but 41 and 2 shown in FIG. 2, FIG. 5, and FIG. As in the practical example, the
vicinity of both ends of the diaphragm can be connected to and supported by the longitudinal
resonance bar itself via a connecting bar. This practical example is structurally the same as that
of the first embodiment in connecting and supporting the vicinity of both ends of the diaphragm
via the connecting rods. In this embodiment, both ends of each of the diaphragms ga and 8b are
connected by a pair of connecting rods 25 with each other by means of a pair of connecting rods
25. , And further connect each connecting rod 25.26 to the other vertical connecting rod 27.28
through the longitudinal resonance rod 6a.
It is linked to 6b. The connecting portion between the diaphragm and the connecting rod uses
the fixing members tea and 18b as in the first embodiment. Also, the connecting rods 25 and 26
share a pair of fixing members, as they form a plane line. In this embodiment, the connecting
rods 27 and 28 are connected to the longitudinal resonating rods 6a and 6b, respectively, but the
longitudinal resonating rods generate longitudinal vibrations, and therefore the vibrations are
not transmitted to the respective connecting rods 27 and 28. It must be taken into consideration.
Therefore, it is necessary to fix one end of the connecting rod 27.28 at the position of the node
of each vibration of the longitudinal resonance rods 6a and 6b, that is, at a position just in the
middle between the diaphragms. [2] As shown in FIG. 5 or 6, it is reluctant to fix it in order to
completely avoid the influence of the vibration of the longitudinal resonance bar. That is, while
the sleeve 29 having an inner diameter slightly larger than the outer diameter of the nuclear
resonant rods 6a and 6b is fitted to the central position (node (10) portion) of the longitudinal
resonant rods 6a and 6b, A screw 80 formed at the end is screwed into the screw hole 31 of the
sleeve 29 so that each point is slightly inserted into the outer peripheral surface of the
longitudinal resonance rods 6a and eb, and the sleeve 29 is longitudinal The gap A is held in
contact with the outer peripheral surface of the resonance rods 5a and 6b. By this configuration,
the vibration of the longitudinal resonance rods 6a and 6b is not transmitted to the connecting
rods 27. 28. Therefore, the vicinity of the both ends of the liveness plate can be statically
supported. The other end of the connecting rod 27.28 is securely fixed as in the connection
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between the connecting rods 16 and 17 in the first embodiment. In FIG. 5, the tips of the
connecting rods 27. 28 are brought into close contact with the longitudinal resonance rods 6a
and 6bK, but as shown in FIG. 6, the connecting rods 27. 28 are screwed into the screw holes 32
of the sleeve 29. While, screw 33a, 33b. Even if SaC is screwed into the screw holes a4a, a4b and
a4c of the sleeve respectively, and the respective tips are screwed into the outer peripheral
surface of the longitudinal resonance rods 5a and 5b (11) to obtain the gap A. Good. Next, a
practical inspection example of a sum sound source provided with a diaphragm Q) anti-cracking
device according to the present invention will be described. The experimental apparatus is a part
of the first embodiment shown in FIG. The conditions are shown below. 1) m moving plates 8a,
3b, 3c. Shikoralmin board that produces a stripe mode with 36 knots at a frequency of 19.65
KH2, length x width x 1 mass = 383.7 m x 98 m x 0.9 mm 2) longitudinal resonance 4i'ia, 6b, 6c,
etc. = 130 shoulder 13 = 130 battle 14 "I'a OMM new curve outside 1 rod size-8 eggs 3)
Exponential horn 3 swing amplitude increase ratio-10 ']"' 6 (H + M (12) outer diameter of the
thick end 5-99 # If thin Outer diameter of end 7 -9 M4) π-type ferrite vibrator 4 resonance
frequency "20 KHz 5) length and width dimension of fixed member 18a, 18b rectangular contact
surface: 3 uXO, 5ff Experimental result of the apparatus of Fig. 8 having the above conditions
Even when the input to the vibrator was increased by 850 W4, the diaphragm did not crack.
On the other hand, according to the conventional method not provided with the crack prevention
device, the limit is 200 to V, and it can be confirmed whether the great effect of the crack
prevention device according to the present invention is achieved. As is apparent from the above
description of the embodiments and the description of the practical examples, the present
invention connects and supports the vicinity of both ends of the diaphragm with connecting rods,
and the vibration of the diaphragm is not transmitted to the connecting rods. As described above,
since the diaphragm and the connecting rod are connected to each other, vibration of the
diaphragm may be disturbed. The both ends of the diaphragm are supported 1 to prevent large
vibration of the both ends 2. Cracking force can be prevented. Therefore, it is possible to apply a
large input (13) force to the transducer, and as a result, it is possible to obtain a powerful
ultrasonic source.
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