TWM563545U - Ultrasonic flow meter - Google Patents

Abstract

The ultrasonic flow meter of the present utility includes: a housing, a first acoustic transceiver, a second acoustic transceiver, and an acoustic reflection unit. The first acoustic transceiver is configured to transmit a first acoustic signal and receive a second acoustic signal. The second acoustic transceiver is configured to transmit the second acoustic signal and receive the first acoustic signal, wherein the second acoustic transceiver and the first acoustic transceiver are disposed on the same line of an outer peripheral surface of the housing. The acoustic reflection unit is disposed within the housing, for reflecting the first acoustic signal and the second acoustic signal, wherein the first acoustic transceiver and the second acoustic transceiver are alternately switched so as to measure the flow velocity and the flow rate of the fluid by measuring a time difference in ultrasonic transmission.

Description

Ultrasonic flowmeter

This creation is about an ultrasonic flowmeter, especially an ultrasonic flowmeter that uses the time difference of ultrasonic transmission to measure the flow of a fluid.

Ultrasonic flowmeters that utilize the time difference of ultrasonic transmission to measure the flow of a fluid can be roughly classified into four configurations.

Please refer to FIG. 1. FIG. 1 is a longitudinal cross-sectional view of the first prior art ultrasonic flowmeter 910. As shown in Fig. 1, the first acoustic wave transmitter 911 and the second acoustic wave transmitter 912 are sandwiched by the same line on the outer peripheral surface of the flow conduit, and the first acoustic wave is transmitted in the ultrasonic flowmeter 910. The 911 generates an acoustic wave signal (for example, an ultrasonic signal) and transmits it to the circulation line, and then is reflected by the inner surface of the circulation line toward the dotted arrow in the figure, thereby being received by the second acoustic wave transmitter 912, and then The flow rate is measured by reflecting the ultrasonic signal transmitted from the second acoustic wave transmitter 912 from the inner surface of the flow path and the time difference of the ultrasonic signal transmitted by the first acoustic wave transmitter 911.

The disadvantage of the ultrasonic flowmeter 910 is that since the reflection causes the attenuation of the ultrasonic signal to be large, it is difficult to measure the minute flow rate, and the first acoustic wave transmitter 911 and the second acoustic wave transmitter 912 are difficult to be mounted.

Please refer to FIG. 2, which is a schematic longitudinal cross-sectional view of a second prior art ultrasonic flowmeter 1010. As shown in Fig. 2, the flow system flows in the flow line toward the solid arrow in Fig. 2, and the first acoustic wave transmitter 1011 and the second acoustic wave transmitter 1012 are sandwiched in the outer circumference of the flow line. The position of the opposite surface of the surface is not at the same position on the same ring, and the first acoustic wave transmitter 1011 is obliquely transmitted with respect to the flow direction of the fluid in the flow line (the direction of the dotted arrow in FIG. 2). And received by the second acoustic wave transmitter 1012. At this time, the transmission and reception of the first acoustic wave transmitter 1011 and the second acoustic wave transmitter 1012 are switched, and the second acoustic wave transmitter 1012 is in the flow line. The opposite flow direction of the fluid is transmitted obliquely (the opposite direction of the dashed arrow in the figure) to the ultrasonic signal, and is received by the first acoustic wave transmitter 1011, so that the flow rate can be measured from the time difference of the ultrasonic signal transmission.

The disadvantage of the ultrasonic flowmeter 1010 is that the axial distance of the first acoustic wave transmitter 1011 and the second acoustic wave transmitter 1012 needs to be increased to maintain the accuracy of the flow velocity measurement when measuring the small diameter flow conduit. In the first place, a longer flow line is required to install the first acoustic wave transmitter 1011 and the second acoustic wave transmitter 1012. Furthermore, in order to reduce the reflection from the flow line, it is necessary to use a material having a slower transfer speed than the flow line, such as an epoxy resin, as a method for improving the accuracy of the measurement, however, when only the resin is used. There will be disadvantages such as the weakening of the ultrasonic vibration.

Please refer to FIG. 3, which is a longitudinal cross-sectional view of a third prior art ultrasonic flowmeter 1110. In Fig. 3, the first acoustic wave transmitter 1111 and the second acoustic wave transmitter 1112 are disposed on both sides of the horizontal straight tube portion 1113 of the circulation line. In the ultrasonic flowmeter 1110, when the fluid flows through the pipeline, the upstream first acoustic wave transmitter 1111 generates an ultrasonic signal from the transducer (not shown) and transmits it to the horizontal pipe portion of the circulation pipe. The fluid within 1113 is received by the downstream ultrasonic transmitter 1112 and converted by the transducer into an electrical signal. Then, the second acoustic wave transmitter 1112 downstream of the next time generates the ultrasonic signal from the transducer and transmits it to the fluid in the horizontal pipe portion 1113 of the circulation line, and is received by the upstream acoustic wave transmitter 1111. And converted by the transducer into an electrical signal. At this time, by using the time difference of the ultrasonic signal transmission, the fluid flow rate in the circulation line can be obtained and the flow rate can be measured.

A disadvantage of the ultrasonic flowmeter 1110 is that when the viscosity of the fluid flowing in the flow conduit of the ultrasonic flowmeter 1110 is high, since the flow conduit is U-shaped, the high-viscosity fluid is accumulated and fixed in circulation. The curved part of the pipeline interferes with the transmission of the ultrasonic signal. In addition, since the flow line has a curved portion, problems such as pressure loss of the fluid occur in the flow line, and it is impossible to measure the correct flow rate, and it is impossible to perform accurate flow measurement. Furthermore, since the piping has a substantially U-shape, there is a problem that the manufacturing cost is high.

Please refer to FIG. 4, which is a schematic longitudinal cross-sectional view of the fourth prior art ultrasonic flowmeter 1210. In Fig. 4, the first acoustic wave transmitter 1211 and the second acoustic wave transmitter 1212 are in the form of a doughnut and are concentric with the conduit passage 1213, and the first acoustic wave transmitter 1211 and the second are joined by an adhesive. The acoustic wave transmitter 1212 is connected to the conduit passage 1213. In the ultrasonic flowmeter 1210, the acoustic wave transmitter 121 delivers an ultrasonic signal and is received by the second acoustic wave transmitter 1212. At this time, the transmission and reception of the first acoustic wave transmitter 1211 and the second acoustic wave transceiver 1212 are switched, so that the flow rate can be measured from the time difference of the transmission of the ultrasonic signal.

A disadvantage of the ultrasonic flowmeter 1110 is that the ultrasonic flowmeter 1110 is used to bond the first acoustic wave transmitter 1211, the second acoustic wave transmitter 1212 and the conduit 1213 with an adhesive, so that a good bonding interface is required to be effective. The ultrasonic signal is transmitted to the pipeline, so there is a disadvantage that the installation is not easy. Furthermore, the ultrasonic flowmeter 1110 has a conical body for enhancing the ultrasonic signal, so that the overall structure thereof cannot be too small.

Therefore, it is necessary to design an ultrasonic flowmeter capable of overcoming the above-described disadvantages of the prior art to obtain an accurate measurement result.

In order to solve the above technical shortcomings, the purpose of the present invention is to provide an ultrasonic flowmeter to solve the problem that it is not easy to obtain accurate measurement results in the case of small pipe diameter and micro flow rate, and it is difficult to achieve miniaturization of the structure.

The ultrasonic flowmeter of the present invention is configured to measure a flow rate of a fluid according to an acoustic wave signal, comprising: a casing having a pipeline passage for supplying a fluid; and a first acoustic wave transmitting unit disposed on the casing, The first sound wave transmitting unit is configured to send a second sound wave signal, and the second sound wave transmitting and receiving unit is disposed on the same line of the outer peripheral surface of the outer casing for transmitting a second sound wave signal. And receiving the first sound wave signal; and a sound wave reflecting unit disposed in the outer casing for reflecting the first sound wave signal and the second sound wave signal; wherein the first sound wave transmitting unit and the second sound wave transmitting and receiving The unit is alternately switched to interactively cause the first acoustic wave transmitting unit to transmit the first acoustic wave signal to be reflected by the acoustic wave reflecting unit to the second acoustic wave transmitting and receiving unit, and the second acoustic wave transmitting and receiving unit transmits the first The second acoustic wave signal is reflected by the acoustic wave reflecting unit to the first acoustic wave transmitting unit to determine the ultrasonic transmission between the first acoustic wave transmitting unit and the second acoustic wave transmitting unit. A measured flow rate difference and flow rate of the fluid.

The ultrasonic flowmeter of the present invention installs two acoustic wave reflecting units in the pipeline passage, and reflects the first acoustic wave signal and the second acoustic wave signal to the axial direction (the direction parallel to the axial direction of the tube), so that the present invention can The created ultrasonic flowmeter enables high-accuracy measurement and miniaturization of ultrasonic flowmeters.

The first sound wave collecting unit and the second sound wave collecting unit of the present invention comprise a transducer, and the structure thereof is preferably a circular plate-like structure.

The acoustic wave reflecting unit of the present invention is composed of a metal material.

The first sound wave transmitting unit and the second sound wave transmitting unit of the present invention can achieve the effect of reducing the size by shortening the set distance.

The first sound wave collecting unit and the second sound wave collecting unit of the present invention can also be embedded in the outer circumference of the outer casing to achieve the effect of integral molding.

The ultrasonic flowmeter of the present invention has the following advantages:

(1) The first acoustic wave transmitting unit and the second acoustic wave transmitting and receiving unit can effectively reflect the ultrasonic waves in a direction parallel to the axial direction of the tube, thereby effectively transmitting the ultrasonic signal to the measurement. The fluid in the tube can be measured with high precision even if the pipe passage is small.

(2) Since the first acoustic wave transmitting unit and the second acoustic wave transmitting unit are disposed outside the outer casing, the first acoustic wave transmitting unit and the second acoustic wave transmitting unit transmit the ultrasonic signal to the pipeline. Ultrasonic noise is generated in the channel, but the acoustic reflection unit is configured in the pipeline channel to reflect the actually measured ultrasonic signal. Therefore, because the transmission path is different, the ultrasonic noise has a strong difference between the ultrasonic signal and the actually measured ultrasonic signal, so that the ultrasonic noise can be effectively filtered and the flow measurement with high precision can be realized.

(3) The ultrasonic flowmeter of the present invention performs calibration without flow, thereby obtaining a high-sensitivity flow measurement.

(4) shortening the arrangement distance of the pair of the first acoustic wave transmitting unit and the second acoustic wave transmitting unit, and inserting the first acoustic wave transmitting unit and the second acoustic wave transmitting unit into the outer casing In the periphery, this provides a small and inexpensive ultrasonic flowmeter.

In order to understand the technical characteristics, content and advantages of this creation and the effects that can be achieved, the author will use the schema in detail and explain the following in the form of the embodiment, and the schematic used in it is only The use of the instructions and the accompanying manuals is not necessarily the true proportion and precise configuration after the implementation of the original creation. Therefore, the proportions and configuration relationships of the attached drawings should not be interpreted or limited in the actual implementation scope. In addition, in order to facilitate understanding, the same elements in the following embodiments are denoted by the same reference numerals.

Referring to FIG. 5, as shown in FIG. 5, the ultrasonic flowmeter 110 includes: a casing 111, a first acoustic wave transmitting unit 113a, a second acoustic wave transmitting unit 113b, and at least one acoustic wave reflecting unit 112a, 112b. . The outer casing 111 has a pipeline passage 114 for supplying a fluid such as air, water, a chemical gas, a chemical solution, etc.; the first acoustic wave transmitting unit 113a is disposed on the outer casing 111 for transmitting a first acoustic wave signal S1 and receiving one The second acoustic wave signal S2; the second acoustic wave transmitting unit 113b and the first acoustic wave transmitting and receiving unit 113a are disposed on the same line on the outer peripheral surface of the outer casing 111 for transmitting the second acoustic wave signal S2 and receiving the first acoustic wave signal S1; the acoustic wave reflecting unit 112a, 112b are disposed in the housing 111 for reflecting the first acoustic signal S1 and the second acoustic signal S2. Please note that the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting and receiving unit 113b of the present invention are alternately switched to interactively cause the first acoustic wave transmitting and receiving unit 113a to transmit the first acoustic wave signal S1 to pass through the acoustic wave reflecting unit 112a. 112b is reflected to the second acoustic wave transmitting unit 113b, and the second acoustic wave transmitting unit 113b also transmits the second acoustic wave signal S2 to pass through the acoustic reflecting unit reflections 112a, 112b to the first acoustic wave transmitting and receiving unit 113a, that is, The first acoustic wave transmitting unit 113a first transmits the first acoustic wave signal S1, first reflected by the acoustic wave reflecting column 116 of the acoustic wave reflecting unit 112a to the acoustic wave reflecting column 119 of the acoustic wave reflecting unit 112b, and then reflected to the second acoustic wave transmitting and receiving unit 113b. After receiving, the second acoustic wave transmitting unit 113b transmits the second acoustic wave signal S2, first reflected by the acoustic wave reflecting column 119 of the acoustic wave reflecting unit 112b to the acoustic wave reflecting column 116 of the acoustic wave reflecting unit 112a, and then reflected to the first acoustic wave transmitting The receiving unit 113a receives and switches interactively, so that the creation can utilize the ultrasonic wave between the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting unit 113b. The time difference is communicated to determine the flow rate and flow rate of the fluid.

Please note that in the present embodiment, the outer casing 111 is a hollow pipe carrying a fluid, and the material thereof is a metal material (such as a copper alloy, etc.), but this is not a limitation of the present creation. In other embodiments of the present creation, The outer casing 111 can also be formed of a ceramic, plastic, glass or resin material.

Please refer to FIG. 6, which is a schematic longitudinal cross-sectional view of the ultrasonic reflecting unit 112a of FIG. 5 of the present invention. As shown in FIG. 6, the acoustic wave reflecting unit 112a is composed of a mounting base 115, an acoustic wave reflecting column 116 and an O-ring sealing ring 117, and the mounting base 115 can be fitted to the housing by a tight fit, welding or screwing. 111. The material of the acoustic reflection column 116 is made of a metal material (such as a copper alloy), but this is not a limitation of the present invention. In other embodiments of the present invention, the acoustic reflection column may also be composed of ceramic, plastic, glass or resin materials. . The acoustic reflection unit 112a shown in Fig. 6 can be understood by those skilled in the art to understand that the acoustic reflection unit 112b is similar to the structure of the acoustic reflection unit 112a. For the sake of brevity, it will not be described herein.

In addition, the acoustic wave reflecting units 112a, 112b are disposed in the housing 111, one of which acts to reflect the first acoustic wave signal S1 and the second acoustic wave signal S2 to the direction of the pipeline axis, and the other function is to convert the first acoustic wave. The signal S1 and the second acoustic wave signal S2 are reflected again to the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting and receiving unit 113b, wherein the broken line portion in FIG. 5 is the path transmitted by the first acoustic wave signal S1, and the second acoustic wave signal S2 is transmitted. The path (not shown) passed is opposite to the path passed by the first acoustic signal S1.

Furthermore, the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting and receiving unit 113b are composed of piezoelectric elements, and are respectively disposed on the same line on the outer peripheral surface of the casing 111, and the shape thereof is mostly a circular plate-like structure. The first acoustic wave transmitting unit 113a and the second acoustic wave transmitting unit 131b are joined to the outer circumference of the casing 111 by an adhesive, or the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting and receiving unit 113b are fixed by a fixed frame. The outer circumference of the casing 111 is fixed, or the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting unit 113b are fitted to the outer circumference of the casing 111. In addition, the arrangement manner of the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting and receiving unit 113b is not a limitation of the present creation, and can be used to fit the first acoustic wave transmitting and receiving unit 113a and the second acoustic wave transmitting and receiving unit 113b. The manner of the outer circumference of the casing 111 is in accordance with the spirit of the present creation.

For example, the function of the present ultrasonic wave flowmeter 110 is explained in accordance with FIG. 5, and the measurement target fluid flows in the full-tube state in the pipe passage 114 toward the solid arrow in FIG. 5, and is located upstream with respect to the flow of the fluid. The first acoustic wave transmitting unit 113a transmits the first acoustic wave signal S1, and the first acoustic wave signal S1 reflects the first acoustic wave signal S1 to the direction parallel to the axis direction of the tube by the acoustic wave reflecting unit 112a (the first acoustic wave signal S1 at this time) The transmission direction is the same as the fluid flow direction. Then, the first acoustic wave signal S1 is reflected by the acoustic wave reflection unit 112b to the second acoustic wave transmission unit 113b to receive the first acoustic wave signal S1.

Similarly, the second acoustic wave signal S2 is transmitted by the second acoustic wave transmitting and receiving unit 113b located downstream with respect to the flow of the fluid, and the second acoustic wave signal S2 is reflected by the acoustic wave reflecting unit 112b to the direction parallel to the axial direction of the tube (at this time, The second acoustic wave signal S2 is transmitted in the opposite direction to the fluid flow direction, and the second acoustic wave signal S2 is reflected by the acoustic wave reflecting unit 112a to the first acoustic wave transmitting and receiving unit 113a to receive the second acoustic wave signal S2.

Since the first acoustic wave transmitting unit 113a and the second acoustic wave transmitting and receiving unit 113b are composed of piezoelectric elements, and the transducer (not labeled) is included, the first acoustic wave signal S1 and the second acoustic wave can be used by the transducer. Signal S2 is converted into a telecommunication signal.

The transmission time T1 of the first acoustic wave signal S1 of the upstream first acoustic wave transmitting unit 113a to the downstream second acoustic wave transmitting unit 113b and the downstream of the second acoustic wave transmitting unit 113b of the downstream are respectively measured from the mutually output electrical signals in the controller (not labeled). The transmission time T2 of the second acoustic wave signal S2 of the first acoustic wave transmitting unit 113b to the upstream first acoustic wave transmitting unit 113a, the transmission time difference ΔT can be calculated by the controller (not shown), the flow velocity V of the fluid and the flow rate Q The time difference ΔT transmitted by the first acoustic signal S1 and the second acoustic signal S2 is calculated according to the following formula:

Where Lp is the path length transmitted by the first acoustic signal S1 and the second acoustic signal S2.

Where A is the cross-sectional area of the pipeline.

Please refer to FIG. 7. FIG. 7 is a longitudinal cross-sectional view of the ultrasonic flowmeter 310 of the present invention. As shown in FIG. 7, FIG. 7 is an ultrasonic flowmeter 310 of another single acoustic reflection unit 312. The dotted line portion is the path transmitted by the first acoustic wave signal S1, and the path transmitted by the second acoustic wave signal S2 is opposite to the path transmitted by the first acoustic wave signal S1. The ultrasonic flowmeter 310 operates in a similar manner to the ultrasonic flowmeter 110 described above, and the difference is different. The paths transmitted by the first acoustic signal S1 and the second acoustic signal S2 are different, and are not described here for the sake of brevity.

Please refer to FIG. 8. FIG. 8 is a longitudinal cross-sectional view of the ultrasonic reflection unit 312 of FIG. 7 of the present invention. As shown in FIG. 8, the acoustic reflection unit 312 is provided by a mounting base 315 and an acoustic reflection column. The 316 and the O-ring seal 317 are formed, and the mounting base 315 can be fitted to the housing 311 in a tight fit, welded manner, or screwed. The material of the acoustic reflection column 316 is a metal material (such as a copper alloy), but this is not a limitation of the present invention. In other embodiments of the present invention, the acoustic reflection column 316 may also be formed of ceramic, plastic, glass or resin materials. .

Please refer to FIG. 9 , which is a longitudinal cross-sectional view of the ultrasonic flowmeter 510 of the present invention. As shown in FIG. 9 , the acoustic wave reflecting units 512 a and 512 b of the ultrasonic flowmeter 510 are composed of a sound wave reflecting plate 514 , 516 is composed of acoustic reflection fixing frames 515, 517, and acoustic reflection fixing frames 515, 517 are fitted to the casing 511 in a close fitting manner. The ultrasonic flowmeter 510 operates in the same manner as the ultrasonic flowmeter 110 except that the acoustic wave reflecting units 512a, 512b of the ultrasonic flowmeter 510 are simple in structure and easy to install. Further, the acoustic wave reflecting plates 514, 516 and the sound wave reflecting fixing frames 515, 517 are not limited to those made of a metal material, and may be formed of ceramic, plastic, glass or a resin material.

Please refer to FIG. 10, which is a detailed structural diagram of the acoustic wave reflecting units 512a, 512b of the ultrasonic flowmeter 510. As shown in Fig. 10, Fig. 10a is a top view of the acoustic wave reflecting unit 512a; Fig. 10b is a top view of the acoustic wave reflecting unit 512b; Fig. 10c is a longitudinal sectional view of the acoustic wave reflecting unit 512a; and Fig. 10d is a sound wave reflecting A schematic longitudinal cross-sectional view of the unit 512b, the structure of the acoustic wave reflecting units 512a, 512b of Fig. 10 can be understood by those skilled in the art based on the above description, and will not be described herein for the sake of brevity.

Please refer to FIG. 11 , which is a schematic longitudinal cross-sectional view of the ultrasonic flowmeter 710 of the present invention. The acoustic wave reflection unit 712 of the ultrasonic flowmeter 710 is composed of the acoustic wave reflection plates 714, 716 and the acoustic wave reflection fixing frame 715, and the acoustic wave reflection fixing frame 715 is fitted to the casing 711 in a close fitting manner. The ultrasonic flowmeter 710 operates in the same manner as the ultrasonic flowmeter 110. Further, the acoustic wave reflection plates 714, 716 and the sound wave reflection fixing frame 715 are not limited to the case of being made of a metal material, and may be formed of ceramic, plastic, glass or resin materials.

Please refer to FIG. 12, which is a detailed structural diagram of the acoustic wave reflection unit 712 of the ultrasonic flowmeter 710. As shown in Fig. 12, Fig. 12a is a top view of the acoustic wave reflecting unit 712, and Fig. 12b is a longitudinal sectional view of the acoustic wave reflecting unit 712. It is known to those skilled in the art that the sound wave reflection of Fig. 12 can be understood based on the above description. The operation of unit 712 will not be repeated here for the sake of brevity. .

In summary, the ultrasonic flowmeter of the present invention can efficiently transmit ultrasonic signals in a fluid in a small-diameter pipe, and can perform high-precision flow measurement at a micro flow rate, which can be miniaturized and cost-effective. Can be greatly reduced.

The above description is only a preferred embodiment of the present invention, and is merely illustrative and not limiting. It will be understood by those skilled in the art that many changes, modifications, and equivalents may be made within the spirit and scope of the present invention.

110, 310, 510, 710, 910, 1010, 1110, 1210‧‧‧ ultrasonic flowmeter

111, 311, 511, 711‧‧‧ shell

112a, 112b, 312, 512a, 512b, 712‧‧‧ acoustic reflection unit

113a, 313a, 513a, 713a, 911, 1011, 1111, 1211‧‧‧ first sound wave transmission unit

113b, 313b, 513b, 713b, 912, 1012, 1112, 1212‧‧‧second sound wave transmission unit

114, 1213‧‧‧ pipeline channel

115, 118, 315‧‧‧ Mounting base

116, 119, 316‧‧‧Sonic reflection column

117, 120, 317‧‧‧O type sealing ring

514, 516, 714, 716‧‧‧Sonic reflector

515, 517, 715‧‧‧Sonic reflector fixing frame

1113‧‧‧Horizontal Department

S1‧‧‧first sound wave signal

S2‧‧‧Second Sonic Signal

In order to more clearly illustrate the technical solutions in the various embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.

Figure 1 is a schematic longitudinal cross-sectional view of a first prior art ultrasonic flowmeter.

Figure 2 is a schematic longitudinal cross-sectional view of a second prior art ultrasonic flowmeter.

Figure 3 is a schematic longitudinal cross-sectional view of a third prior art ultrasonic flowmeter.

Figure 4 is a schematic longitudinal cross-sectional view of a fourth prior art ultrasonic flowmeter.

Fig. 5, Fig. 7, Fig. 9, and Fig. 11 are longitudinal cross-sectional views showing different embodiments of the ultrasonic flowmeter of the present invention.

Fig. 6 is a longitudinal sectional view showing the ultrasonic reflecting unit of Fig. 5 of the present invention.

Fig. 8 is a longitudinal sectional view showing the ultrasonic reflecting unit of Fig. 7 of the present invention.

Fig. 10 is a detailed structural diagram of the acoustic wave reflecting units 512a, 512b of the ultrasonic flowmeter 510.

FIG. 12 is a detailed structural diagram of the acoustic wave reflection unit 712 of the ultrasonic flowmeter 710.

Claims (10)

An ultrasonic flowmeter for measuring a flow rate of a fluid according to an acoustic wave signal, comprising: a casing having a pipeline passage for supplying a fluid; and a first acoustic wave transmitting unit disposed on the casing for transmitting a first acoustic wave signal and a second acoustic wave signal; a second acoustic wave transmitting and receiving unit disposed on the same line as the outer peripheral surface of the outer casing and configured to transmit the second acoustic wave signal and receive the second acoustic wave transmitting and receiving unit a first acoustic wave signal; and a sound wave reflecting unit disposed in the outer casing for reflecting the first acoustic wave signal and the second acoustic wave signal; wherein the first acoustic wave transmitting unit and the second acoustic wave transmitting and receiving unit are interactively Switching to interactively cause the first acoustic wave transmitting unit to transmit the first acoustic wave signal to be reflected by the acoustic wave reflecting unit to the second acoustic wave transmitting and receiving unit, and causing the second acoustic wave transmitting and receiving unit to transmit the second acoustic wave signal. The sound wave reflection unit is reflected to the first sound wave transmission unit to measure the ultrasonic transmission time difference between the first sound wave transmission unit and the second sound wave transmission unit. And flow velocity of the fluid. The ultrasonic flowmeter of claim 1, wherein the outer casing is made of a metal material or a plastic material. The ultrasonic flowmeter of claim 1, wherein the acoustic wave reflecting unit is disposed in the outer casing. The ultrasonic flowmeter of claim 1, wherein the number of the acoustic reflection units is one. The ultrasonic flowmeter of claim 1, wherein the acoustic reflection unit is provided in two numbers. The ultrasonic flowmeter of claim 5, wherein the acoustic reflection unit reflects the first acoustic signal and the second acoustic signal to reflect the first acoustic signal and the second acoustic wave to the pipeline channel. One axis direction. The ultrasonic flowmeter of claim 1, wherein the acoustic reflection unit is made of a metal material, a ceramic material, a plastic, a resin or a glass material. The ultrasonic flowmeter of claim 1, wherein the first acoustic wave transmitting unit and the second acoustic wave transmitting unit are fitted on a same line on an outer peripheral surface of the outer casing. The ultrasonic flowmeter of claim 1, wherein the first acoustic wave transmitting unit and the second acoustic wave transmitting unit are fixed to the same line on the outer peripheral surface of the outer casing by an adhesive bonding. The ultrasonic flowmeter of claim 1, wherein the first acoustic wave transmitting unit and the second acoustic wave transmitting unit are fixed to a same line on an outer peripheral surface of the outer casing by a fixing frame.