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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view for explaining the
measurement principle of an ultrasonic flow meter, and FIG. 2 is a side sectional view showing
the configuration of a conventional ultrasonic flow meter transducer. And FIG. 3 is a side
sectional view and a plan view showing an embodiment of the present invention, and FIG. 4 is a
side view and a front view of a backup member used in the embodiment of the present invention.
is there. 3 ······ Ultrasonic transducer, 4 · · · · · · · · · · · ······································································ Top 20
Backup member 21 Locking projection 22 Locking edge.
[Detailed description of the invention] This invention is the medium flow rate of the fluid flowing
through the pipelines and grooves (11220 / evening! The present invention relates to an
ultrasonic perspiration meter transducer used to measure a /. In the ultrasonic flowmeter, as
shown in the IE / figure, the ultrasonic flowmeter transmitter / receiver C, hereinafter referred to
as a transmitter / receiver) 2m, 2b are disposed with their positions shifted from each other in
the traveling direction of the conduit IKfi body guiding the fluid. , Based on the time difference
between the time when the ultrasonic wave emitted from the transmitter / receiver 2a reaches
the transmitter / receiver 2bK and the time when the ultrasonic wave emitted from the
transmitter / receiver 2b reaches the transmitter / receiver 2aK. The flow fv pipe of the fluid
inside is obtained, and the amount of transfer of the housing in the conduit 1 is obtained from
this speed fv. As a transducer to be used in this manner, the structure shown in FIG. 2 and (b) k is
known. In FIG. 0, reference numeral 3 is an ultrasonic transducer. The ultrasonic vibrator 3 is
fixed to the shoe 4 because, for example, nine busy silver electrodes on both sides of a diskshaped piezoelectric element are vapor-deposited. The optical book which transmits the
ultrasonic waves generated by the shoe 4 # f ultrasonic transducer 3 and the like to the conduit l
(FIG. 81) K is made of metal or plastic, or the like. In addition, for the convenience of the bottom
5 ti transducer of the shoe 4. 6、221
\ 9 Conduit IK tightly attached. The vibrator attachment
surface 6 of the second shoe 4 is formed obliquely with respect to the bottom surface 5 so that
ultrasonic waves generated from the ultrasonic vibrator 3 are emitted obliquely with respect to
the bottom surface 5. ing. Then, the case 7 is worn by covering the shoe 4 KFih z--4 and the
ultrasonic transducer 3. Between the top plate 111g of the case 7 and the upper surface 92 of
the shoe 4, a backup member 10 is attached to prevent the Fi and the S-4 from intruding into the
case 7. The backup member lO is formed in a cubic shape by a plastic resin or the like. Reference
numerals 6b, 11m, and flb denote lead wires connected to both ends of the ultrasonic transducer
30, respectively. Moreover, the code ¦ symbol 12 is empty l in case 4! It is a potting agent filled
with I, and this bottling agent 12KFi, a plastic resin such as epoxy resin is used. Therefore, when
a .7M AC-flI tube of ultrasonic vibration 4M predetermined frequency is applied through the lead
wires 11m and 11b, the ultrasonic transducer 3 vibrates at the same frequency, whereby the
direction of arrow A through the shoe 4 (Powder 22) An ultrasonic wave is emitted to the (Mfigure (i)). Conversely, when the ultrasonic wave of the above frequency reaches the ultrasonic
transducer 3 from the direction of arrow B via the shoe 4, the ultrasonic transducer 3 vibrates at
the same frequency, thereby the IJ-wire 11a.
A sympathetic voltage is generated between 11b. Thus, the IEJllIIK transducer is used to transmit
and receive ultrasonic waves. By the way, the above-mentioned conventional transducer Fi has
the following drawbacks. 1) As mentioned above, 1 transmitter / receiver is attached to a conduit
and 6 hooks are attached, and since the shoe 4 is vibrated by the ultrasonic wave generated from
the ultrasonic transducer 3, the pressing force is applied to the bottom 5 It will be received. In
order to prevent the shoe 4 from intruding into the case 7 due to this pressing force, the backup
member 10 is provided as described above. However, it supports only the back-up member 10Fi
of the rattan and only the upper surface 9 of the shell 40, and does not support the surface 6 of
the vibrator, therefore, When a pressing force larger than that of the other part 5 is applied, the
shoe 4 intrudes into the case 7 (422, (('91), and the transmitter / receiver becomes useless K. (B)
Further, as described above, the space in the case 4 is filled with the potting agent 12 such as an
epoxy resin, and the potting agent 12 is prevented from leaking until the potting agent 12 is
cured. The gap between the side surface of the case 3-4 and the inner surface of the case 7 must
be sealed by a pipe adhesive. Therefore, there is a need to increase the dimensional accuracy of
the case 3L-4 and the case 7, and at the same time, the above-mentioned sealing work is
complicated and troublesome, and the number of man-hours in this portion is increased. The
present invention has been made in view of the above circumstances, and the object thereof is to
provide an ultrasonic flowmeter transmitter-receiver as a whole, which is free from the case
where a tool is intruded into a case, and which is an assembled product. The back-up member is
formed in a plate shape, and the plate-like back-up member is fixed to the side surface of the case
so as to have the upper surface and vibrator mounting surface Km. In addition, between the
lower part of the case ω) 24) the mouth end of the shoe and the bottom surface of the shoe are
locked to each other, and adhesion of the case and the shoe is performed in this part. Hereinafter,
this invention 1 will be described with reference to the drawings. FIG. 3 symbol%-shows an
embodiment of the present invention. The same reference numerals as in FIGS. 1 (a) and 1 (b)
indicate the same constituent elements, and the description thereof will be omitted. In the figure,
reference numeral 20 denotes a backup member Ih, and this backup member 20 is constituted
by a plate-like member as shown by WE in FIG. 0), ←) K, and the left half c of the bottom is
referred to as the bottom) When 20 m is formed horizontally, the right half of the bottom
(hereinafter referred to as a slope) 2θb is formed so as to be inclined downward toward the
right side 20 e from the center of the bottom.
The back-up member 20.20 formed in this way has a lower surface 20m and an inclined surface
20b in contact with the upper surface 9 and the vibrator mounting surface 6J / c of the shoe 4 as
shown in FIG. The case 7 is attached to both inner side surfaces by welding or screwing. In
addition, reference numeral 21tf is a locking protrusion, which is located under the case 7 (6)
22'M '. ;! This is a book formed by bending the 1lll # 10 end to the inside of the case 7
(toward it. A lock * 22 is provided on the periphery of the bottom surface 5 of the cover 3-4
opposite to the lock projection 21. The locking edge 22 is formed by a notch − along the
periphery M of the bottom surface 50. And between the said latching protrusion 21 and the
latching edge 22 is sealed by the adhesive agent. Thus, in the above-described transducer, the
shoe 4 is fixed by the plate-like backup member 20 at the upper side and fixed by the locking
ridges 21 at the lower side. In the past, the mounting potential of the shoe 4 does not deviate
either upward or downward -0 In particular, not only the upper surface 9 but also the%
transducer attachment surface 6 above the shoe 4 is simultaneously locked by the backup
member 20 Therefore, even if the lower part of the bottom 5 of the vibrator mounting surface 6
has a larger pressing force than that of the other part of the bottom 5, the shoe 4 does not indent
into the case 7 as described above. Since the contact surface Kfii-1 n of the contact surface 21
between the shoe 4 and the case 7 and the seal JLt Fis locking ridge 21 and the locking edge 22
is (7) 2 e, the case 3. At the same time, it is possible to easily assemble the shoe 4 and the case 7
and to easily perform potting. In the above embodiment, the portion of the backup member in
contact with the shoe is bent to increase the contact area between the backup member 20 and
the shoe 4 (the backup member is not limited to only three sheets, but three or more). In that
case, each backup member may be provided so that the front and rear surfaces of the backup
member and the inner surface of the case are in contact with each other. As discussed above, 1)
The ultrasonic flowmeter transducer according to the present invention has a backup member
formed in a plate shape, and the square plate-like backup member is in contact with the upper
surface of the shoe and the mounting surface of the slider. Since the lower open end of the case
and the bottom surface of the shoe are locked to each other while being fixed to the side of the
case, the following advantages are provided.
The back-up of the inside is surely done, and the strength of the transducer is large. ̶) 27) 01)
Easy to pot. The tolerance of the dimensions of the 4iD shoe and the case may be large.