JP3949982B2 - Clamp-on type ultrasonic flowmeter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clamp-on type ultrasonic flow meter.
[0002]
[Prior art]
2. Description of the Related Art A clamp-on type ultrasonic flow meter such as a propagation time difference type or a Doppler type is known as a flow meter that is mounted on the outer peripheral surface of a tubular body and measures the flow rate of a fluid that moves inside the tubular body.
[0003]
FIG. 7 shows an example of a conventional clamp-on type ultrasonic flow meter and its usage. The clamp-on type ultrasonic flow meter in FIG. 7 is a propagation time difference type flow meter. The clamp-on type ultrasonic flowmeter is composed of a pair of ultrasonic transceivers 71a and 71b. The ultrasonic transmitter / receiver 71a includes an ultrasonic transducer 72a and a wedge-shaped ultrasonic propagation material 73a. The wedge-shaped ultrasonic wave propagation material 73a includes a bottom surface 74a and a slope 75a that forms an acute angle with the bottom surface 74a. The ultrasonic transducer 72a is attached to the inclined surface 75a of the wedge-shaped ultrasonic propagation material 73a. An electrode and a lead wire (not shown) for applying a voltage to the ultrasonic transducer are provided on the surface of the ultrasonic transducer 72a on the wedge-shaped ultrasonic propagation material side and the surface on the opposite side. Yes. Similarly, the ultrasonic transmitter / receiver 71b has a configuration in which the ultrasonic transducer 72b is mounted on the inclined surface 75b of the wedge-shaped ultrasonic wave propagation material 73b. In general, a piezoelectric vibrator formed of a lead zirconate titanate-based ceramic or the like is used as the ultrasonic vibrator. The wedge-shaped ultrasonic wave propagation material is made of epoxy resin, acrylic resin, stainless steel, or the like.
[0004]
When an electrical drive signal is applied to the electrodes, each of the ultrasonic transducers 72a and 72b applies (transmits) ultrasonic waves to the wedge-shaped ultrasonic wave propagation material, and conversely applies (receives) ultrasonic waves. Then, an electrical reception signal is generated at the electrode. Accordingly, each of the ultrasonic transmitters / receivers 71a and 71b provided with the ultrasonic transducer is also an ultrasonic transmitter and a receiver. The ultrasonic transmitters / receivers 71a and 71b are arranged so that the ultrasonic waves propagate obliquely with respect to the moving direction of the fluid inside the tubular body 76 (the direction indicated by the arrow 77 in FIG. 7). It is arrange | positioned on an outer peripheral surface. A broken line 79 written in FIG. 7 means an example of an ultrasonic wave propagation path.
[0005]
The flow rate of the fluid moving inside the tubular body 76 is measured as follows. First, a drive signal is applied to the ultrasonic transducer 72a of the ultrasonic transmitter / receiver 71a to transmit ultrasonic waves. The ultrasonic wave propagates along the propagation path 79 in the order of the wedge-shaped ultrasonic wave propagation material 73a, the tubular body 76, the moving fluid, the tubular body 76, and the wedge-shaped ultrasonic wave propagation material 73b. It is received by the sound wave vibrator 72b. The ultrasonic wave transmission time T ₁ required from when the ultrasonic transmitter / receiver 71a starts transmitting ultrasonic waves until the ultrasonic transmitter / receiver 71b receives ultrasonic waves is measured.
[0006]
Next, a drive signal is applied to the ultrasonic transducer 72b of the ultrasonic transmitter / receiver 71b to transmit ultrasonic waves. The ultrasonic wave propagates in the reverse direction along the propagation path and is received by the ultrasonic transducer 72a of the ultrasonic transceiver 71a. The ultrasonic wave propagation time T ₂ required from when the ultrasonic transmitter / receiver 71b starts transmitting ultrasonic waves until the ultrasonic transmitter / receiver 71a receives ultrasonic waves is measured.
[0007]
The time (T ₁ and T ₂ ) required for the ultrasonic wave to propagate between the ultrasonic transceivers 71a and 71b varies depending on the direction of propagation of the ultrasonic wave (the direction indicated by arrows 79a and 79b shown in FIG. 7). Value. The ultrasonic wave that travels from the ultrasonic transmitter / receiver 71a to the ultrasonic transmitter / receiver 71b (in the direction indicated by the arrow 79a) propagates in the fluid so to speak, so that the propagation time T ₁ It becomes a short value compared with the case where it exists. On the other hand, the ultrasonic wave from the ultrasonic transceiver 71b (in the direction indicated by arrow 79b) to the ultrasonic transceiver 71a toward Since propagating in fluid against the flow of the fluid, the propagation time T ₂ are, the fluid is stationary It becomes a long value compared with the case where it is. The value of the difference in propagation time (T ₂ −T ₁ ) has a correlation with the moving speed of the fluid, and the moving speed of the fluid is calculated from the difference in propagation time. Then, the flow rate of the fluid is calculated from the moving speed of the obtained fluid, the inner diameter of the tubular body 76, and the like.
[0008]
In order to increase the measurement sensitivity of the clamp-on type ultrasonic flow meter, the value of the difference in propagation time may be increased, that is, the ultrasonic propagation distance in the fluid may be set longer. In order to increase the propagation distance of ultrasonic waves in the fluid, the angle of the ultrasonic transducer mounting slope of the wedge-shaped ultrasonic wave propagation material is increased so that the incident angle of ultrasonic waves at the interface between the wedge-shaped ultrasonic wave propagation material and the tubular body is increased. You can adjust.
[0009]
[Problems to be solved by the invention]
In the conventional clamp-on type ultrasonic flowmeter, even if the incident angle of the ultrasonic wave at the interface between the wedge-shaped ultrasonic wave propagation material and the tubular body is increased, the flow rate measurement sensitivity cannot be increased to some extent. This is because the amount of ultrasonic reflection at the interface increases as the incident angle of the ultrasonic wave increases, or the amount of ultrasonic wave propagating through the wall of the tubular body increases, and propagates in the fluid. This is because the value of the received signal output from the ultrasonic transmitter / receiver is reduced by receiving the received ultrasonic wave.
[0010]
An object of the present invention is to provide a clamp-on type ultrasonic flowmeter having high measurement sensitivity.
[0011]
[Means for Solving the Problems]
The inventor forms a plurality of surfaces parallel to the ultrasonic transducer mounting inclined surface on the bottom surface of the wedge-shaped ultrasonic wave propagation material so as to reflect ultrasonic waves at the interface between the wedge-shaped ultrasonic wave propagation material and the tubular body. It was found that a clamp-on type ultrasonic flowmeter with high measurement sensitivity can be provided.
[0012]
The present invention relates to the inclined surface of the wedge-shaped ultrasonic wave propagation material in which the ultrasonic transducer includes a bottom surface and at least one inclined surface that forms an acute angle with the bottom surface, and propagates ultrasonic waves in a direction perpendicular to the inclined surface. An ultrasonic transmitter / receiver mounted on an ultrasonic transmitter / receiver, wherein a plurality of surfaces parallel to the ultrasonic transducer mounting slope are aligned on the bottom surface of the ultrasonic wave propagation material. .
[0013]
Preferred embodiments of the ultrasonic transceiver of the present invention are as follows.
(1) The wedge-shaped ultrasonic wave propagation material has a configuration in which a plurality of fiber reinforced resin sheets having a configuration in which a plurality of high elastic fibers are arranged in parallel along a sheet plane are laminated and integrated in a resin material sheet. .
(2) The highly elastic fiber is a carbon fiber.
[0014]
According to the present invention, a pair of the ultrasonic transmitters / receivers is accommodated and fixed in an elongated case having an opening on a bottom surface in a positional relationship such that the inclined surfaces on which the ultrasonic transducers of the respective ultrasonic transmitters / receivers are mounted do not face each other. There is also a clamp-on type ultrasonic flowmeter.
[0015]
The clamp-on type ultrasonic flowmeter of the present invention is preferably for measuring a flow rate of a fluid moving inside a fluororesin tubular body.
[0016]
In the present invention, each ultrasonic transmitter / receiver of the clamp-on type ultrasonic flowmeter is fixed to the outer peripheral surface of the tubular body, and formed on the bottom surface of the ultrasonic wave propagation material of each ultrasonic transmitter / receiver, There is also a flow measurement structure characterized in that at least a part of each surface parallel to the ultrasonic transducer mounting slope is in close contact with the tubular body.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An ultrasonic transceiver according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of an ultrasonic transceiver according to the present invention and a form of use thereof. FIG. 2 is a cross-sectional view of the ultrasonic transmitter / receiver and the tubular body cut along the cutting line I-I entered in FIG. 1. The ultrasonic transmitter / receiver 11 shown in FIGS. 1 and 2 includes an ultrasonic transducer 12 and a wedge-shaped ultrasonic propagation material 13. The wedge-shaped ultrasonic wave propagation member 13 includes a bottom surface 14 and a slope 15 that is inclined with respect to the bottom surface 14. In the wedge-shaped ultrasonic wave propagation material 13, the ultrasonic wave propagates in a direction perpendicular to the inclined surface 15. The ultrasonic transducer 12 is attached to the inclined surface 15 of the wedge-shaped ultrasonic propagation material 13. A plurality of surfaces 16 parallel to the ultrasonic transducer mounting inclined surface 15 are formed in alignment on the bottom surface 14 of the wedge-shaped ultrasonic wave propagation material 13. In addition, an electrode and a lead wire (not shown) for applying a voltage to the ultrasonic transducer are provided on the surface of the ultrasonic transducer 12 on the wedge-shaped ultrasonic propagation material side and the surface on the opposite side. Yes.
[0018]
As shown in FIG. 2, the ultrasonic transmitter / receiver 11 is fixed to the outer peripheral surface of the tubular body so that at least a part of each surface 16 parallel to the ultrasonic transducer mounting inclined surface is in close contact with the tubular body 17. Yes. In order to bring the surface 16 of the ultrasonic wave propagation material and the tubular body 17 into close contact with each other, the ultrasonic wave transmitter / receiver 11 may be pressed against the tubular body to cause the surface 16 to bite into the wall of the tubular body. Further, a notch corresponding to the surface 16 of the ultrasonic wave propagation material is formed in the tubular body 17, and the ultrasonic wave transmitter / receiver is fixed in accordance with the notch so that the surface 16 and the tubular body 17 are brought into close contact with each other. You can also.
[0019]
The ultrasonic waves transmitted by the ultrasonic transducer 12 propagate through the inside of the wedge-shaped ultrasonic wave propagation material 13 along the propagation path indicated by the broken line 20 shown in FIG. 2, and a plurality of surfaces 16 formed on the bottom surface 14. Incident perpendicular to. By forming such a plurality of surfaces 16 on the bottom surface of the wedge-shaped ultrasonic wave propagation material 13, the incident angle of ultrasonic waves at the interface between the surface 16 and the tubular body becomes zero degrees, and reflection of ultrasonic waves at the interface is extremely small. can do. Therefore, by using such an ultrasonic transceiver, the measurement sensitivity of the clamp-on type ultrasonic flowmeter can be increased.
[0020]
The surface 21 formed on the bottom surface of the wedge-shaped ultrasonic wave propagation member 13 is preferably perpendicular to the ultrasonic transducer mounting inclined surface 15. By forming the surface 21 so as to be perpendicular to the ultrasonic transducer mounting inclined surface 15, most of the ultrasonic waves applied to the ultrasonic wave propagation material 13 from the ultrasonic transducer 12 can be incident on the surface 16. it can.
[0021]
In the ultrasonic wave propagation member 13, the ultrasonic wave propagates in a direction perpendicular to the ultrasonic transducer mounting inclined surface 15. The wedge-shaped ultrasonic wave propagation material 13 can be formed in the same manner as a conventional wedge-shaped ultrasonic wave propagation material. In the wedge-shaped ultrasonic wave propagation material, the cylindrical portion perpendicular to the ultrasonic transducer and the outer portion thereof can also be formed from materials having greatly different acoustic impedance values. By configuring the ultrasonic wave propagation material in such a configuration, it is possible to prevent the ultrasonic wave from spreading and propagating from a direction perpendicular to the ultrasonic transducer.
[0022]
The wedge-shaped ultrasonic wave propagation material 13 may have a configuration in which a plurality of fiber reinforced resin sheets having a configuration in which a plurality of high elastic fibers are arranged in parallel along the sheet plane are laminated and integrated in a resin material sheet. preferable. The wedge-shaped ultrasonic wave propagation material 13 can be formed by cutting a commercially available fiber reinforced resin material. 2, 3, and 6, hatching is omitted from the cross section of the wedge-shaped ultrasonic wave propagation material 13 in order to explain the arrangement of the highly elastic fibers of the fiber reinforced resin material.
[0023]
The length direction of the highly elastic fiber 18 of the fiber reinforced resin material is preferably parallel to the surface 16 formed on the bottom surface of the wedge-shaped ultrasonic wave propagation material. When ultrasonic waves are applied to such a fiber reinforced resin material, vibration along the length direction of the highly elastic fiber is suppressed, and therefore, a direction perpendicular to the length direction of the fiber (that is, a direction perpendicular to the surface 16). ) Can propagate ultrasonic waves with excellent directivity, and the measurement sensitivity of the clamp-on type ultrasonic flowmeter can be further increased. Japanese Patent Application Laid-Open No. 7-284198 discloses the control of the propagation direction of ultrasonic waves by a fiber reinforced resin material.
[0024]
The highly elastic fibers 18 are preferably arranged in one direction or two directions parallel to the surface 16 of the wedge-shaped ultrasonic wave propagation material in terms of ease of manufacturing the fiber reinforced resin material and cost. In the case where the high elastic fibers are aligned and arranged in one direction parallel to the surface 16 of the wedge-shaped ultrasonic wave propagation material 13, the length direction of the high elastic fibers 18 is set to the bottom surface of the wedge-shaped ultrasonic wave propagation material 13 as shown in FIG. It is preferable that the line projected onto 14 and the line projected onto the bottom surface from the normal of the surface 16 are parallel.
[0025]
When the highly elastic fibers 18 are arranged in two directions parallel to the surface 16 of the wedge-shaped ultrasonic wave propagation material 13, the wedge-shaped ultrasonic wave propagation material 13 is made up of a plurality of fiber reinforced resin sheets in each adjacent sheet. It is preferable that the highly elastic fibers are alternately laminated and integrated so that the alignment directions of the high elastic fibers are orthogonal to each other.
[0026]
In order to suppress excitation of vibration in the direction along the length direction of the highly elastic fiber 18 of the wedge-shaped ultrasonic wave propagation material 13, the tensile elastic modulus in the length direction of the highly elastic fiber is preferably 50 GPa or more, and 100 GPa. More preferably. Examples of the highly elastic fiber 18 include carbon fiber, silicon carbide fiber, nylon fiber, polyamide fiber, and aramid fiber, and it is preferable to use carbon fiber or silicon carbide fiber. Examples of the resin material 19 of the fiber reinforced resin sheet include epoxy resin, nylon resin, polyimide resin, PEEK (polyether ether ketone), phenol resin, unsaturated polyester resin, polyamide resin, polycarbonate resin, and polyamideimide resin. It is preferable to use an epoxy resin.
[0027]
In addition, if air (gap) exists between the wedge-shaped ultrasonic wave propagation member 13 and the tubular body 17, the acoustic impedance of the air is small, so that the ultrasonic wave is reflected at the interface between the wedge-shaped ultrasonic wave propagation material and the air. Therefore, it is preferable to fill the contact medium with the gap between the wedge-shaped ultrasonic wave propagation material and the tubular body. As the contact medium, a liquid or paste-like material in which bubbles do not easily remain is used. Generally, water, oil, water glass, grease, petroleum jelly or the like is used. When the ultrasonic transceiver is fixed to the tubular body and the fluid flow rate is continuously measured, it is preferable to use grease as the contact medium. A liquid polymer material or a polymer gel material can also be used as the contact medium. Examples of the polymer gel material include silicone gel and polyurethane gel.
[0028]
FIG. 3 is a cross-sectional view showing an example of a V-type clamp-on type ultrasonic flowmeter using the ultrasonic transmitter / receiver of the present invention and a form of use thereof. The clamp-on type ultrasonic flowmeter of FIG. 3 is called V type because of the shape of the ultrasonic propagation path 30. The V-type clamp-on type ultrasonic flowmeter has high measurement sensitivity, and since the pair of ultrasonic transmitters / receivers 11 can be arranged on a straight line along the length direction of the tubular body 17, attachment work to the tubular body is easy. There is an advantage of being. The clamp-on type ultrasonic flowmeter of FIG. 3 has high measurement sensitivity because the wedge-shaped ultrasonic propagation material 13 is formed with a plurality of surfaces 16 parallel to the ultrasonic transducer mounting inclined surface 15.
[0029]
There are many types of clamp-on type ultrasonic flowmeters such as a propagation time difference type and a Doppler type, and the number of ultrasonic transceivers used is also various. The clamp-on type ultrasonic flowmeter is described in detail in “Flow measurement AtoZ” (edited by Japan Metrology Equipment Industry Association, Chapter 8, 1995). The ultrasonic transceiver of the present invention can be preferably used for any of various types of clamp-on type ultrasonic flowmeters.
[0030]
FIG. 4 shows an example of another ultrasonic transceiver according to the present invention and a form of use thereof. The ultrasonic transmitter / receiver 41 in FIG. 4 has the same configuration as the ultrasonic transmitter / receiver in FIG. 1 except that the surface of the wedge-shaped ultrasonic propagation member 43 on the tubular body side is curved in a concave shape. . By making the surface of the ultrasonic wave propagation member 41 on the side of the tubular body concavely curved, the area where the tubular body 17 is in close contact with the surface 46 parallel to the ultrasonic transducer mounting slope is increased. Accordingly, more ultrasonic waves can be transmitted from the ultrasonic transmitter / receiver 41 to the inside of the tubular body, and the measurement sensitivity of the ultrasonic flowmeter can be further increased.
[0031]
Next, the clamp-on type ultrasonic flowmeter of the present invention will be described. FIG. 5 is a partially cutaway perspective view showing an example of a clamp-on type ultrasonic flowmeter according to the present invention and a form of use thereof. The clamp-on type ultrasonic flowmeter of FIG. 5 is a slope in which an ultrasonic transducer of each ultrasonic transmitter / receiver is mounted on an elongated case 51 having a pair of the ultrasonic transmitter / receiver 11 of FIG. 15 is accommodated and fixed in such a positional relationship that it does not oppose each other. The case 51 includes a case main body 52 and a case lid 53.
[0032]
If the dimensions (inner diameter and outer diameter) and material of the tubular body 17 are known, an appropriate positional relationship between the pair of ultrasonic transceivers 11 can be calculated. It can be fixed using. By fixing the positional relationship between the pair of ultrasonic transmitter / receivers 11 in advance, the work of mounting the clamp-on type ultrasonic flowmeter on an existing tubular body (such as a pipe of a chemical plant) becomes easy.
[0033]
The clamp-on type ultrasonic flowmeter and the tubular body 17 are simply and reliably fixed by sandwiching the tubular body between the case 51 and the flowmeter fixing material 55 and tightening the case 51 and the flowmeter fixing material 55 with a screw 56. be able to. And in order to make the surface 16 and the tubular body 17 of the ultrasonic wave propagation material 11 of each ultrasonic transmitter / receiver 11 closely contact, the bolt 54 is tightened and the ultrasonic wave propagation material 13 is bitten into the tubular body. Thereby, the incident angle of the ultrasonic wave at the interface between the surface 16 of the wedge-shaped ultrasonic wave propagation material and the tubular body 17 becomes zero degrees, and the reflection amount of the ultrasonic wave at the interface can be reduced. The clamp-on type ultrasonic flowmeter of the present invention can easily penetrate the ultrasonic wave propagation material into the tubular body, so that the flow rate of the fluid moving inside the tubular body formed of a soft material such as fluororesin is measured. Can be preferably used. Further, a notch corresponding to the surface 16 of the ultrasonic wave propagation material is formed in the tubular body 17 in advance, and the ultrasonic transmitter / receiver is fixed in accordance with the notch so that the surface 16 and the tubular body 17 are in close contact with each other. It can also be made.
[0034]
When the dimensions (inner diameter and outer diameter) and material of the tubular body 17 are unknown, it is necessary to set the distance between the pair of ultrasonic transceivers when the flow meter is attached to the tubular body. For this reason, the flowmeter can be configured to be able to arbitrarily change the distance between the ultrasonic transceivers by providing a long hole 57 in the case lid 53.
[0035]
In addition, when existing piping in a chemical plant or the like is removable, a flow measurement structure configured by fixing each ultrasonic transmitter / receiver of a clamp-on type ultrasonic flowmeter to the outer peripheral surface of the tubular body is used. It is also preferable to measure the flow rate. In the flow measurement structure of the present invention, at least a part of each surface parallel to the ultrasonic transducer mounting slope formed on the bottom surface of the ultrasonic wave propagation material of each ultrasonic transceiver is brought into close contact with the tubular body. Using such a flow rate measurement structure, the flow rate measurement structure in which the positional relationship of the ultrasonic transmitter / receiver is precisely adjusted in advance (a tubular body and a clamp-on type ultrasonic flowmeter are integrated), and an existing pipe The flow rate can be measured immediately by simply exchanging. In addition, it is preferable to attach appropriate pipe connection means, such as a flange, to both ends of the tubular body of the flow measurement structure to facilitate replacement of the existing piping and the flow measurement structure.
[0036]
FIG. 6 is a cross-sectional view showing the main part of the configuration of an example of the flow measurement structure according to the present invention. FIG. 6 shows only one ultrasonic transmitter / receiver and part of the tubular body of the flow measurement structure in order to explain the propagation path of the ultrasonic wave. As shown in FIG. 6, by bringing the entire surface 16 formed on the bottom surface of the ultrasonic wave propagating material into close contact with the tubular body, the amount of ultrasonic reflection at the interface between the surface 16 of the ultrasonic wave propagating material and the tubular body is reduced. Can be reduced. Furthermore, by setting the inner peripheral surface of the tubular body to a shape corresponding to the outer peripheral surface, the incident angle of the ultrasonic wave at the interface between the tubular body and the fluid to be measured is also zero (that is, between the tubular body and the fluid). The amount of reflected ultrasonic waves at the interface can also be reduced), and the measurement sensitivity of the flow measurement structure can be further increased.
[0037]
【The invention's effect】
By using the clamp-on type ultrasonic flowmeter of the present invention, the flow rate of fluid can be measured with high sensitivity.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of an ultrasonic transceiver according to the present invention and a form of use thereof.
2 is a cross-sectional view of an ultrasonic transmitter / receiver and a tubular body cut along a cutting line I-I written in FIG. 1; FIG.
FIG. 3 is a cross-sectional view showing an example of a clamp-on type ultrasonic flowmeter using a pair of the ultrasonic transceivers of FIG.
FIG. 4 is a diagram showing an example of another ultrasonic transceiver according to the present invention and a form of use thereof.
FIG. 5 is a partially cutaway perspective view showing an example of a clamp-on type ultrasonic flowmeter according to the present invention and a form of use thereof.
FIG. 6 is a cross-sectional view showing the main part of the configuration of an example of the flow measurement structure according to the present invention.
FIG. 7 is a diagram showing an example of a conventional clamp-on type ultrasonic flow meter and a form of use thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11, 41 Ultrasonic transmitter-receiver 12 Ultrasonic vibrator 13, 43 Wedge-shaped ultrasonic propagation material 14 Bottom surface 15, 45 Slope 16, 46 Surface 17 parallel to ultrasonic transducer mounting slope 17 Tubular body 18 High elastic fiber 19 Resin material 20 , 30, 60 Example of ultrasonic propagation path 21 Surface 51 Case 52 Case body 53 Case lid 54 Bolt 55 Flow meter fixing material 56 Screw 57 Long hole 58 Lead wire 59 Screw 67 Tubular bodies 71a and 71b Ultrasonic transmitters and receivers 72a and 72b Ultrasonic transducers 73a and 73b Wedge-shaped ultrasonic propagation members 74a and 74b Bottom surfaces 75a and 75b Slope 76 Tubular body 77 Fluid moving direction 79 Example of ultrasonic propagation path

Claims (6)

An ultrasonic transducer is mounted on the inclined surface of the wedge-shaped ultrasonic wave propagation material having a bottom surface and at least one inclined surface forming an acute angle with respect to the bottom surface and propagating ultrasonic waves in a direction perpendicular to the inclined surface. What is claimed is: 1. An ultrasonic transmitter / receiver comprising: a plurality of surfaces parallel to an ultrasonic transducer mounting slope arranged on the bottom surface of the ultrasonic wave propagation material; The wedge-shaped ultrasonic wave propagation material has a configuration in which a plurality of fiber reinforced resin sheets having a configuration in which a plurality of high elastic fibers are arranged in parallel along a sheet plane are laminated and integrated in a resin material sheet. The ultrasonic transceiver according to claim 1. The ultrasonic transceiver according to claim 2, wherein the highly elastic fiber is a carbon fiber. A pair of ultrasonic transceivers according to any one of claims 1 to 3 and a slender case having an opening on a bottom surface, and inclined surfaces on which ultrasonic transducers of each ultrasonic transceiver are mounted are mutually connected. A clamp-on type ultrasonic flowmeter that is housed and fixed in a positional relationship that does not face each other. The clamp-on type ultrasonic flowmeter according to claim 4, which is used for measuring a flow rate of a fluid moving inside the fluororesin tubular body. The ultrasonic transmitter / receiver of the clamp-on type ultrasonic flowmeter according to claim 4 is fixed to the outer peripheral surface of the tubular body, and formed on the bottom surface of the ultrasonic wave propagation material of each ultrasonic transmitter / receiver, At least a part of each surface parallel to the ultrasonic transducer mounting slope is in close contact with the tubular body.

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