JP2007201992

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DESCRIPTION JP2007201992
PROBLEM TO BE SOLVED: To secure a stable electrical connection by securing an electrode pin
of an ultrasonic transducer from a disturbance factor by using a fixture of the ultrasonic
transducer, thereby achieving high reliability with high reliability. An object of the present
invention is to provide a mounting structure of an ultrasonic transducer and an ultrasonic
flowmeter using the structure. An electric short circuit and a deformation of electrode pins 2a
and 2b can be prevented by fixing an ultrasonic transducer 1 to a flow path 6 and protecting the
electrode pins 2a and 2b at the same time. Thus, the highly reliable ultrasonic transducer 1 can
be obtained, and the flow measurement of the fluid to be measured can be stably measured.
[Selected figure] Figure 1
Ultrasonic transducer and ultrasonic flowmeter
[0001]
The present invention relates to an ultrasonic transducer that transmits and receives ultrasonic
pulses, and an ultrasonic flow meter that measures the flow rate and flow velocity of gas and
liquid using an ultrasonic transducer.
[0002]
Conventionally, as a fixing tool for this type of ultrasonic transducer, as shown in FIG. 7, an
insulating portion 27 provided with connecting terminals 26a and 26b on a positioning body 25
is provided, and a terminal 29a of an ultrasonic transducer 28 is provided. , 29b are electrically
connected to the connection terminals 26a, 26b.
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The positioning body 25 is fixed to the fluid passage wall 30 with a screw or the like. Further, as
shown in FIG. 8, the fixed body 31 is provided with a takeout hole 32 through which the
terminals 29a and 29b of the ultrasonic transducer 28 do not contact and is fixed to the fluid
passage wall 30 by a screw or the like For example, refer to Patent Document 1). UnexaminedJapanese-Patent No. 11-322592
[0003]
However, in the above-described conventional configuration, the terminals 29a and 29b and the
connection terminals 26a and 26b penetrate the positioning body 25 and the fixing body 31, so
that the terminals are not completely independent in the penetrating portion. Therefore, an
electrical short circuit may occur due to a disturbance factor such as a conductor. Further, since
the terminals 29a and 29b and the connection terminals 26a and 26b are longer than the
positioning body 25 and the fixing body 31, there is a problem that they are deformed by an
external impact. Furthermore, since the fixed body 31 is provided with the extraction hole 32
through which the terminals 29a and 29b are penetrated, there is a problem that the rotation
angle of the ultrasonic transducer 28 can not be fixed.
[0004]
The present invention solves the above-mentioned problems, and by securing the electrode pins
of the ultrasonic transducer with a fixing tool of the ultrasonic transducer from disturbance
factors, stable electrical connection is made possible, which is a problem. It is an object of the
present invention to provide an ultrasonic transducer having a highly reliable attachment
configuration and an ultrasonic flowmeter using the ultrasonic transducer.
[0005]
In order to solve the above problems, the present invention provides an ultrasonic transducer
having positive and negative electrode pins, a lead wire electrically connected to the positive and
negative electrode pins, and a super wire to which the lead wire is connected. The flow path for
mounting the sound wave transducer and the electrode pin of the positive electrode and the
negative electrode when the ultrasonic wave transmission / reception device is fixed to the flow
path are accommodated in spaces independent of each other.
[0006]
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According to the invention, the electrode pins of the positive electrode and the negative electrode
of the ultrasonic transducer are enclosed in the space provided in the fixture, so that they can be
less susceptible to disturbances, such as electrical conductors and shocks, and electrical shorts It
can be prevented.
In addition, since the electrode pin is accommodated in the space, the rotational direction can be
restricted.
[0007]
The fixture for the ultrasonic transducer according to the present invention and the ultrasonic
flowmeter using the same are capable of fixing the ultrasonic transducer in the flow path and
protecting the electrode pin at the same time to electrically short the electrode pin or Since
deformation can be prevented, a highly reliable ultrasonic transducer can be obtained, and the
flow measurement of the fluid to be measured can be stably measured.
[0008]
A first invention relates to an ultrasonic transducer having a positive electrode and a negative
electrode pin, a lead wire electrically connected to the positive electrode and the negative
electrode pin, and an ultrasonic transducer having the lead wire connected. Conductors that are
disturbance factors by having a configuration in which the flow path for mounting the wave
device and the electrode pin of the positive electrode and the negative electrode are
independently placed when the ultrasonic transducer is fixed to the flow path. By not receiving
the impact directly on the electrode pin, it is possible to prevent an electrical short circuit.
[0009]
According to a second aspect of the present invention, in particular, when the ultrasonic
transducer according to the first aspect of the present invention is fixed to the flow path by using
the fixing device of the ultrasonic transducer, a partition plate is provided between the positive
and negative electrode pins. As a result, it is possible to obtain a highly reliable ultrasonic
transducer by making the electrode pins hard to short circuit.
[0010]
In the third aspect of the present invention, in particular, when fixing the flow path of the
ultrasonic transducer with the fixture of the ultrasonic transducer according to the first or
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second invention, the positive and negative electrode pins are made independent of each other.
By providing the structure to be stored in the open space, the conductor does not directly touch
the electrode pin, and an electrical short circuit can be prevented.
[0011]
According to a fourth aspect of the present invention, in particular, when the ultrasonic
transducer of the third aspect is fixed to the flow path by using the fastener of the ultrasonic
transducer of the third aspect, the positive and negative electrode pins are made independent. By
providing a gap between the electrode pin side of the ultrasonic transducer housed in the space
and the sunken surface, it is possible to prevent water from flowing into the electrode pin by
capillary action and corrosion of the electrode pin And electrical shorts can be prevented.
[0012]
In the fifth invention, in particular, the ultrasonic transducer is fixed to the flow path by the
fixture of the ultrasonic transducer according to the first to fourth inventions, and electrodes of
positive and negative electrodes in the ultrasonic transducer are provided. By providing the
structure for suppressing the movement of the pin in the rotational direction, it is possible to
regulate the rotational direction of the ultrasonic transducer, and an ultrasonic transducer with
high stability can be obtained.
[0013]
According to a sixth aspect of the present invention, in particular, the fixture of the ultrasonic
transducer according to any of the first to fifth aspects, a flow rate measuring unit through which
the fluid to be measured flows, and a measuring circuit for measuring the propagation time
between the ultrasonic transducers. The ultrasonic transducer has high reliability by making the
electrode pin of the device less susceptible to the conductor or the impact which is the
disturbance factor by providing the flow rate calculating means for calculating the flow rate
based on the signal from the measuring circuit. An ultrasonic transducer can be obtained, and the
flow measurement of the fluid to be measured can be stably measured.
[0014]
Embodiment 1 FIG. 1 and FIG. 2 show the configuration of an ultrasonic transducer according to
a first embodiment of the present invention and an ultrasonic flowmeter using the same.
[0015]
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In FIG. 1, the ultrasonic transducer 1 has a vibration propagation suppressing body 4 and a
direction suppressing body 5 attached, and is fixed to the flow path 6 via a fixing tool 3 with a
screw (not shown).
The lead wire 11 is connected to the lead wire terminals 10a and 10b with the electrode pins 2a
and 2b of the ultrasonic transducer 1 while changing the direction by 90 degrees.
[0016]
FIG. 2 shows a perspective view of the fixture of the ultrasonic transducer in the first
embodiment.
[0017]
The lead wire chambers 8a, 8b are configured by protective walls 9a, 9b, 9c, 9d so as to
surround the lead wire terminals 10a, 10b connected to the electrode pins 2a, 2b.
Fixation to the flow path 6 is fixed to the screw holes 7a and 7b through screws (not shown).
[0018]
The operation and action of the fixing device for the ultrasonic transducer configured as
described above will be described below.
First, the fixture 3 uses a material having an insulating function such as a resin.
Lead wire terminals 10a and 10b are connected to the electrode pins 2a and 2b of the ultrasonic
transducer 1, the lead wire 11 is passed through the lead wire chambers 8a and 8b of the fixture
3, and the fixture 3 is illustrated in the flow path 6 Do not fix with screws.
The protective walls 9a, 9b, 9c, 9d in the fixture 3 are higher than the lead wire terminals 10a,
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10b.
[0019]
As described above, in the embodiment, by making the protective walls 9a, 9b, 9c, 9d of the
fixture 3 higher than the lead wire terminals 10a, 10b, it becomes difficult to cause a short
circuit by a conductor or the like that is a disturbance factor, The deformation of the lead wire
terminals 10a and 10b can also be prevented by not directly receiving the impact and the like on
the lead wire terminals 10a and 10b.
[0020]
Further, in the present embodiment, the protective walls 9a, 9b, 9c, 9a, 9b are provided in both
the lead wire chambers 8a, 8b, but only the protective wall 9d for partitioning the lead wire
chambers 8a, 8b is provided due to the configuration. Thus, the electrical short circuit between
the lead wire terminals 10a and 10b can be prevented, and the rotation direction of the
ultrasonic transducer 1 can be regulated.
[0021]
Second Embodiment FIG. 3 is a perspective view of a fixture for an ultrasonic transducer
according to a second embodiment.
[0022]
The lead wire chambers 8a, 8b are configured by protective walls 9a, 9b, 9c, 9d so as to
surround the lead wire terminals 10a, 10b connected to the electrode pins 2a, 2b, and the
protective walls 9a, 9b, 9c, The sky wall 12 is provided on 9 d.
[0023]
The operation and action of the fixing device for the ultrasonic transducer configured as
described above will be described below.
First, lead wire terminals 10a and 10b are connected to the electrode pins 2a and 2b of the
ultrasonic transducer 1, the lead wire 11 is passed through the lead wire chambers 8a and 8b of
the fixture 3, and the fixture 3 is inserted into the flow path 6. Fix with screws not shown.
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The lead wire terminals 10 a, 11 b are accommodated in the space surrounded by the protective
walls 9 a, 9 b, 9 c, 9 d and the ceiling wall 12 in the fixture 3.
[0024]
As described above, in the embodiment, when the lead wire terminals 10a and 10b are contained
in the protective walls 9a, 9b, 9c and 9d of the fixture 3 and the ceiling wall 12, the conductors
are directly connected to the lead wire terminals 10a and 10b. It is difficult to cause an electrical
short circuit, and the deformation of the lead terminals 10a and 10b can be prevented by not
receiving impacts directly on the lead terminals 10a and 10b.
[0025]
Third Embodiment FIG. 4 is a cross-sectional view of a fastener for an ultrasonic transducer
according to a third embodiment.
[0026]
The lead wire chamber 8a, 8b is provided with protective walls 9a, 9b, 9c, 9d and a top wall 12
so as to surround the lead wire terminals 10a, 10b connected to the electrode pins 2a, 2b. A gap
13 is provided between the wire terminals 10a and 10b.
[0027]
As described above, in the embodiment, by providing the gap 13 between the lead wire terminals
10 a and 10 b and the ceiling wall 12 of the fixture 3, the lead wire terminals 10 a and 10 b do
not directly contact the ceiling wall 12. Therefore, when a conductive liquid such as water
adheres to the ceiling wall 12 and flows toward the lead wire terminals 10a and 10b, the
capillary action causes the space between the ceiling wall 12 and the lead wire terminals 10a and
10b to conduct electricity such as water. It is also possible to prevent the possibility of corrosion
of the lead terminals 10a and 10b due to the flow of the protective liquid.
[0028]
As shown in the perspective view of FIG. 5, the ceiling wall 12 is supported by the protection
walls 9a and 9c, and the protection wall partitions the lead wire terminals 10a and 10b to the
ceiling wall 12, as shown in the perspective view of FIG. 9 d may be provided.
[0029]
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Fourth Embodiment FIG. 6 is a block diagram showing a schematic configuration of an ultrasonic
transducer fixing device according to a fourth embodiment and an ultrasonic flow meter using
the same.
[0030]
In this embodiment, it is assumed that the fluid to be measured is a city gas, and a household gas
meter is used as an ultrasonic flow meter, and the material constituting the flow rate measuring
unit 15 is an aluminum alloy die cast.
[0031]
Further, about 500 kHz is selected as the operating frequency of the ultrasonic transducers 16
and 17.
The oscillator circuit 18 is composed of, for example, a capacitor and a resistor and transmits a
square wave of about 500 kHz, and the drive circuit 19 uses a signal of the oscillator circuit 18
to drive the ultrasonic transducer 16 and the square wave is a burst signal of three waves.
Enables output of a drive signal.
Moreover, in order to improve the resolution of the measurement flow rate, a single-around
method is used as the measurement means.
[0032]
The control unit 24 outputs a transmission start signal to the drive circuit 19 and, at the same
time, starts the time measurement of the timer 22.
When receiving the transmission start signal, the drive circuit 19 drives the ultrasonic transducer
16 to transmit an ultrasonic pulse.
The transmitted ultrasonic pulse propagates in the flow rate measuring unit 15 and is received
by the ultrasonic transducer 17.
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The received ultrasonic pulse is converted into an electric signal by the ultrasonic transducer 17
and output to the reception detection circuit 21.
The reception detection circuit 21 determines the reception timing of the reception signal, and
outputs a reception detection signal to the control unit 24.
When receiving the reception detection signal, the control unit 24 outputs a transmission start
signal to the drive circuit 19 again after a lapse of a preset delay time td, and performs the
second measurement.
After repeating this operation N times, the timer 22 is stopped.
The arithmetic unit 23 divides the time measured by the timer 22 by N of the number of times of
measurement and subtracts the delay time td to calculate the propagation time t1.
[0033]
Subsequently, the ultrasonic wave transmitter / receiver connected to the drive circuit 19 and the
reception detection circuit 21 is switched by the switching circuit 20, and the control unit 24
again outputs a transmission start signal to the drive circuit 19 and simultaneously starts time
measurement of the timer 22.
Contrary to the measurement of the propagation time t1, ultrasonic pulses are transmitted by the
ultrasonic transducer 17 and the measurement received by the ultrasonic transducer 16 is
repeated N times, and the propagation time t2 is calculated by the operation unit 23.
[0034]
Here, the distance connecting the centers of the ultrasonic transducer 16 and the ultrasonic
transducer 17 is L, the speed of sound in the absence of air is C, the flow velocity in the flow rate
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measuring unit 15 is V, the flow of non-measurement fluid The propagation times t1 and t2 are
t1 = L / (C + V cos θ) (1) t2 = L /, where θ is the angle between the direction of this and the line
connecting the centers of the ultrasonic transducer 16 and the ultrasonic transducer 17. (C?
V cos θ) (2)
If the sound velocity C is eliminated from the equation (1) (2) to obtain the flow velocity V, then
V = L / 2 cos θ (1 / t1?
1 / t2) (3) is obtained.
Since L and θ are known, the flow velocity V can be obtained by measuring t1 and t2. Assuming
that the flow velocity V and the area of the flow rate measurement unit 15 are S, and the
correction coefficient is K, the flow rate Q can be calculated by Q = KSV (4).
[0035]
As described above, the fixture for the ultrasonic transducer according to the present invention
and the ultrasonic flow meter using the same can prevent an electrical conductor or an impact
that is a disturbance factor from being directly received by the electrode pin, thereby causing an
electrical short circuit. Since it is possible to prevent the flow, it is possible to measure the flow
rate of the fluid to be measured with high stability. Furthermore, it can be applied to applications
such as ultrasonic flowmeters that measure the flow rate or flow rate of gas or liquid by
ultrasonic waves.
[0036]
Fastener for Ultrasonic Transducer in Embodiment 1 of the Present Invention and Configuration
of Ultrasonic Flowmeter Using the Same A perspective view of the fastener for ultrasonic
transducer in Embodiment 1 of the Present Invention of the present invention The perspective
view of the fixing tool of the ultrasonic transducer in Embodiment 2 The sectional view of the
fixing tool of the ultrasonic transducer in Embodiment 3 of the present invention The ultrasonic
transducer in the second and third embodiments of the present invention 3 is a perspective view
of an ultrasonic flowmeter using the ultrasonic transducer of the present invention and a block
diagram including a cross-sectional view of the ultrasonic flowmeter of the present invention and
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a conventional ultrasonic transducer fixture and an ultrasonic flowmeter using the same Block
diagram A conventional ultrasonic transducer fixture and a block diagram of an ultrasonic
flowmeter using the same
Explanation of sign
[0037]
Reference Signs List 1 ultrasonic transducer 3 fixing device 8a, 8b lead wire chamber 9a, 9b, 9c,
9d protective wall 12 top wall 13 gap
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