JPH10200487A - Support mechanism for cylindrical acoustic transmitter-receiver for acoustic communication utilizing fluid in piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase acoustic energy transferred to/from fluid, and to decrease the circulation resistance of fluid by centripetally providing support bars more than three inside piping, providing through holes on an acoustic transmitter/receiver and loosely fitting the holding bars into the respective through holes. SOLUTION: An acoustic transmitter-receiver 2 is arranged inside cold water piping 1. Concerning the acoustic transmitter-receiver 2, a piezoelectric element 4 is bonded and integrated at one end of metallic thick cylindrical resonator 3. At the centroid position of cylindrical resonator 3 corresponding to three holding bars 5 centripetally projected inside the piping 1, through holes 6 are provided so as to be loosely fitted to the respective support bars 5. Thus, the acoustic transmitter-receiver 2 is coaxially held at a center inside the piping 1. When a transmission-reception circuit 8 impresses a signal voltage to the piezoelectric element 4, the piezoelectric element 4 radically vibrates, impresses the sonic vibration from the matall cylindrical resonator 3 to water in the piping 1 and transmits a signal. Since the propagation of this vibration through the holding bars 5 to piping walls is small, the loss of acoustic energy is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic transducer for acoustic communication using a fluid such as water or oil in a pipe.

[0002]

2. Description of the Related Art For example, in an air conditioner equipped with a cold / hot water pipe, an acoustic transducer for acoustic communication is installed in the cold / hot water pipe, and the air conditioner and the equipment in the air conditioning zone are connected via the water in the cold / hot water pipe. There is an attempt to communicate with the central control unit side device. In such communication, there is an attempt to fix the acoustic transducer configured to perform respiratory vibration in a cylindrical shape to a support rod and to arrange the transducer coaxially in a pipe, and to use such an acoustic transducer. Thereby, the acoustic energy exchanged with water can be increased without increasing the flow resistance of the water in the pipe. (Japanese Patent Application Laid-Open No. 8-182 by the present applicant)
See the specification and drawings attached to the '980 application. )

[0003]

In the method in which a cylindrical acoustic transducer that respires and vibrates is fixed to a support rod and held in a pipe, the vibration in the respiratory vibration is transmitted to the pipe through the support rod, so that it exchanges with water. Loss of sound energy occurs. An object of the present invention is to solve such a problem.

[0004]

In order to solve the above-mentioned problems, according to the present invention, three or more support rods are installed as a set inside a pipe in a centripetal manner, and sound is transmitted and received by respiratory vibration. In the acoustic transducer configured to perform, the through-hole corresponding to each of the support rods is provided, and the support rod is loosely fitted into each through-hole, so that the acoustic transducer is aligned in the axial direction in the pipe. Suggest to support.

[0005] In the present invention described above, a plurality of support rods or a single support rod may be provided. In the case of one set, the through hole corresponding to the support rod is provided at the position of the center of gravity of the acoustic transducer in the axial direction. It is proposed to provide holes.

Further, the present invention proposes that in the above-mentioned configuration, the support rod is loosely fitted to a node of the vibration in the axial direction of the acoustic transducer.

According to the present invention, a cylindrical acoustic transducer comprises:
The center of the pipe is supported by the loosely fitted support rod, and acoustic energy can be exchanged with a fluid such as water in the pipe by the respiratory vibration. At this time, since the support rod is not fixed to the acoustic transducer, vibration of respiratory vibration is not transmitted to the pipe via the support rod.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view conceptually showing a configuration of a wave transmitting / receiving section to which the present invention is applied, and FIGS. 2 and 3 are cross-sectional views of main parts. FIG. 4 is a perspective view showing the configuration of the acoustic transducer. Reference numeral 1 denotes a pipe, and the pipe 1 transfers a fluid such as water, such as a cold / hot water pipe of an air conditioner. Reference numeral 2 denotes an acoustic transducer. The acoustic transducer 2 has a cylindrical shape and is configured to perform respiratory vibration. As shown in FIG. 4, for example, such an acoustic transducer 2 is joined to an end of a metal cylinder 3 such as duralumin or the like by joining a piezoelectric element 4 such as a piezoelectric ceramic formed in an annular shape having the same width as the wall thickness. And can be configured integrally. For such joining, an appropriate method such as a method using an adhesive, a method using brazing, a method using a screw, or the like can be applied. The arrows in the figure indicate the polarization directions. Reference numeral 5 denotes three support rods protruding from the inside of the pipe 1 in a centripetal manner, and the acoustic transducer 2 corresponds to the positions of the three support rods 5 when they are installed centripetally. At the position, a through hole 6 is provided for fitting each support rod 5 with play.

In the above configuration, each through hole 6
In the state of FIG. 2 in which the corresponding support rod 5 is loosely fitted, the acoustic transducer 2 is coaxially held at the center in the pipe 2 by the support rod 5 which is not fixed.

In this state, when an AC signal voltage is applied to the electrodes of the piezoelectric element 4 from the transmission / reception circuit 8 of the transmission / reception device 7 such as a controller via the signal line 9, the piezoelectric element 4 whose polarization direction is indicated by the arrow in FIG. A radial vibration in which the diameter increases and decreases, that is, a so-called respiratory vibration, is transmitted to one side of the metal cylinder 3. The metal cylinder 3 whose one edge is given a respiratory vibration from the axial direction operates as a resonator,
As in the case of the piezoelectric element 4, respiratory vibration whose diameter increases and decreases is performed. The acoustic transducer 2 can transmit a signal by applying an ultrasonic wave or an audible sound wave to an incompressible fluid such as water in the pipe 1 by the respiratory vibration.

On the other hand, when the ultrasonic wave propagates through the water in the cold / hot water pipe 4, the metal cylinder 3 operates as a resonator by the ultrasonic wave and performs respiratory vibration in the same manner as described above. Since the power is transmitted to the piezoelectric element 4 by the operation opposite to the above,
An AC signal voltage is generated between the electrodes of the piezoelectric element 4 according to the respiratory vibration. Therefore, the signal can be received by the acoustic transducer 2.

In the above-mentioned transmission / reception operation, since the supporting rod 5 is not fixed to the acoustic transducer 2, the vibration of the respiratory vibration is not transmitted to the pipe 1 via the supporting rod 3, so that the acoustic energy loss is reduced. Reduced.

In each of the through holes 6 of the acoustic transducer 2,
The procedure for loosely fitting and holding the corresponding support rods 5 is as follows: after the support rods 5 are fitted in the respective through holes 6 in the centripetal direction, adhesive, welding, screwing, etc. And the like can be applied. Or, after inserting the acoustic transducer 2 in the pipe 1,
The support rods 5 may be penetrated from the outside to the inside of the pipe 1 and may be loosely fitted into the respective through holes 6. In this case, the support bar 5 is
As shown in FIG. 3, the joint may be held at a central position, or as shown in FIG.

In the above example, one set of the support rods 5 is provided, but a plurality of sets can be made to correspond to one acoustic transducer 2. Also, the number of support rods 5 in each set is 3
One or more is appropriate. Furthermore, when supporting with a set of support rods 5, the position of the acoustic transducer 2 provided with the through hole 4 is
The position of the center of gravity in the axial direction is preferable. In this case, stable holding can be performed. Further, when the support rod 5 is supported by one or a plurality of sets of the support rods 5, it is effective for the stable support to loosely fit the support rods 5 to the nodes of the acoustic transducer 2 in the axial vibration.

[0015]

The present invention is as described above. Therefore, when transmitting and receiving by sound while holding it in a sound transmitter / receiver pipe for acoustic communication using a fluid such as water or oil in the pipe, Since the vibration in the vibration is not transmitted to the pipe through the support rod, there is an effect that the loss of acoustic energy can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration example of a part of a sound transmitting / receiving unit of a system that performs communication by applying a sound transducer of the present invention.

FIG. 2 is a cross-sectional view of a main part of FIG.

3 is a cross-sectional view of a main part of FIG. 1 of another example.

FIG. 4 is an explanatory view showing main components of a cylindrical vibrator constituting the acoustic transducer of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Acoustic transducer 3 Metal cylinder 4 Piezoelectric element 5 Support rod 6 Through hole 7 Transmitter / receiver 8 Transmitter / receiver circuit 9 Signal line

Claims (4)

[Claims] 1. A cylindrical acoustic transmitter / receiver configured to centrifugally install three or more support rods as a set inside a pipe and configured to transmit and receive sound by respiratory vibration. Utilizing the fluid in the pipe, the acoustic transducer is supported in the pipe in the axial direction by providing through-holes corresponding to the rods and loosely fitting the support rods into each through-hole. Supporting Mechanism of Cylindrical Acoustic Transceiver for Changing Acoustic Communication 2. A support mechanism for a cylindrical acoustic transducer for acoustic communication using a fluid in a pipe according to claim 1, wherein a plurality of sets of support rods are provided. 3. The use of the fluid in the pipe according to claim 1, wherein a set of the support rods is one set, and a through hole corresponding to the support rod is provided at the position of the center of gravity of the acoustic transducer in the axial direction. Supporting Mechanism of Cylindrical Acoustic Transceiver for Changing Acoustic Communication 4. A cylindrical acoustic transducer for acoustic communication utilizing fluid in a pipe according to claim 1, wherein the support rod is loosely fitted to a node of the axial vibration of the cylindrical acoustic transducer. Corrugation support mechanism