CN112903047B - Clamping type ultrasonic flow sensor - Google Patents
Clamping type ultrasonic flow sensor Download PDFInfo
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- CN112903047B CN112903047B CN202110054846.3A CN202110054846A CN112903047B CN 112903047 B CN112903047 B CN 112903047B CN 202110054846 A CN202110054846 A CN 202110054846A CN 112903047 B CN112903047 B CN 112903047B
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- ultrasonic
- hose
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- shell
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/14—Casings, e.g. of special material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
Abstract
The invention provides a clamping type ultrasonic flow sensor, which comprises: the clamping device comprises a shell, a clamping piece and a clamping piece, wherein a groove is formed in the shell, and a buckle is arranged at the first end of the shell; the first end of the upper cover is rotatably connected with the second end of the shell, the second end of the upper cover is buckled with the buckle and covers the groove, so that a measuring passage is formed and used for accommodating a hose, and the width of the measuring passage is smaller than the pipe diameter of the hose in a natural state; two ultrasonic transducer, all set up in the casing is different from the one side of recess, and be located respectively measure the both sides of route, two ultrasonic transducer mutual transmission and receipt ultrasonic signal, just ultrasonic signal's propagation direction with the direction of liquid flow in the hose has an angle. The clamping type ultrasonic flow sensor solves the problems that a clamping type ultrasonic flow sensor in the prior art is difficult to clamp on a small-diameter hose, is difficult to install, has low measurement precision and is high in production cost.
Description
Technical Field
The invention relates to the technical field of ultrasonic measurement, in particular to a clamping type ultrasonic flow sensor.
Background
Ultrasonic flow sensors typically utilize the piezoelectric effect of piezoelectric materials, with appropriate transmit circuitry applying electrical energy to the piezoelectric element of the transmitting transducer to cause it to vibrate ultrasonically. Ultrasonic signals are transmitted into the fluid at an angle, received by the receiving transducer, and converted to electrical energy by the piezoelectric element for detection. According to the principle of signal detection, the current ultrasonic flow sensor mainly adopts two types of time difference method and Doppler method. The Doppler method is used for determining the flow of fluid by measuring the ultrasonic Doppler frequency shift scattered by scatterers in inhomogeneous fluid by using the acoustic Doppler principle, and is suitable for measuring the flow velocity of the fluid containing suspended particles, bubbles and the like. The time difference method is to measure the difference between the propagation time of ultrasonic pulse during forward and backward flow to reflect the flow speed of fluid, and the propagation direction of ultrasonic signal may be at a certain angle or parallel to the flow direction of fluid.
When liquid flow rate measurement is performed in the fields of ultrapure water usage monitoring, chemical corrosion liquid flow rate detection, liquid inlet and liquid discharge processes of biological reaction vessels, acid-base balance control in a chromatographic separation process, blood liquid flow rate monitoring in a hemodialysis instrument and the like in semiconductor production, a non-invasive measurement method is generally used to avoid the risk of cross contamination caused by direct contact of an ultrasonic flow sensor and liquid. And in semiconductor, medical, or biopharmaceutical processes, relatively small diameter plastic or rubber hoses, typically 3mm to 30mm in diameter, are often used in large quantities to carry liquids. The traditional ultrasonic flow sensor is large in size, difficult to clamp on a small-diameter hose and difficult to obtain good acoustic coupling, so that the measurement accuracy of the ultrasonic flow sensor is low; and the traditional ultrasonic flow sensor is generally complex in structure and difficult to machine and assemble, which results in higher cost of the ultrasonic flow sensor.
Disclosure of Invention
The invention aims to provide a clamping type ultrasonic flow sensor, which solves the problems that the clamping type ultrasonic flow sensor in the prior art is difficult to clamp on a small-diameter hose, is difficult to install, has low measurement precision and is higher in production cost.
In order to achieve the above object, the present invention provides a clamp-type ultrasonic flow sensor, including:
the clamping device comprises a shell, a clamping piece and a clamping piece, wherein a groove is formed in the shell, and a buckle is arranged at the first end of the shell;
the first end of the upper cover is rotatably connected with the second end of the shell, the second end of the upper cover is buckled with the buckle and covers the groove, so that a measuring passage is formed and is used for accommodating a hose, and the width of the measuring passage is smaller than the pipe diameter of the hose in a natural state;
the two ultrasonic transducers are arranged on one surface of the shell, which is different from the groove, and are respectively positioned on two sides of the measuring passage, the two ultrasonic transducers mutually transmit and receive ultrasonic signals, and an angle is formed between the propagation direction of the ultrasonic signals and the flowing direction of the liquid in the hose;
the guided wave structure is positioned between the measuring passage and the corresponding ultrasonic transducer and is connected with the measuring passage and the corresponding ultrasonic transducer so as to transmit an ultrasonic signal emitted by the ultrasonic transducer;
and the ultrasonic flow measuring module is electrically connected with the ultrasonic transducers and used for measuring the flow speed of the liquid in the hose according to the time difference or the phase difference of the ultrasonic signals received by the two ultrasonic transducers.
Optionally, the cross section of the measuring passage is one or a combination of square, rectangle, circle or ellipse.
Optionally, the casing is solid construction, two ultrasonic transducer all inlays and locates in the casing, ultrasonic transducer with measure the casing between the passageway and be the guided wave structure.
Optionally, the shell is a hollow structure, and the guided wave structure is a solid structure.
Optionally, the width of the guided wave structure gradually increases along the direction from the measurement path to the ultrasonic transducer.
Optionally, the guided wave structure is a quadrilateral, and any side of the quadrilateral coincides with a side wall of the measurement passage.
Optionally, the wave guide structure is a triangle, and any side of the triangle coincides with a side wall of the measurement passage.
Optionally, the guided wave structure is annular.
Optionally, the wave guiding structure is a quadrilateral ring, and any side of the quadrilateral ring coincides with a side wall of the measurement passage.
Optionally, the wave guide structure has a housing, and the housing is filled with one or more of water, oil, resin, rubber, silica gel, mixed metal powder, ceramic powder, glass powder, hollow glass spheres, or hollow plastic spheres.
In the clamping type ultrasonic flow sensor provided by the invention, a groove is formed in a shell, and a buckle is arranged at the first end of the shell; the first end of the upper cover is rotatably connected with the second end of the shell, the second end of the upper cover is buckled with the buckle and covers the groove, so that a measuring passage is formed, the measuring passage is used for accommodating a hose, the ultrasonic flow sensor is not directly contacted with liquid in the hose, non-invasive measurement is realized, and cross contamination can not be formed; because the width of the measuring passage is smaller than the pipe diameter of the hose in a natural state, the hose is placed in the measuring passage, and is clamped and deformed, so that the hose and the measuring passage form good acoustic coupling, and the measuring precision of the ultrasonic flow sensor is improved; the two ultrasonic transducers are arranged on the surface of the shell, which is different from the groove, and are respectively positioned on two sides of the measuring passage, the two ultrasonic transducers can transmit and receive ultrasonic signals mutually, and the propagation direction of the ultrasonic signals and the advancing direction of liquid in the hose form an included angle, so that the ultrasonic signals propagated along the forward flow direction and the backward flow direction have a time difference or a phase difference; the guided wave structure is positioned between the measuring passage and the corresponding ultrasonic transducer and is connected with the measuring passage and the corresponding ultrasonic transducer so as to transmit the ultrasonic signal emitted by the ultrasonic transducer; transmitting an ultrasonic signal through an ultrasonic transducer on one side of the measuring passage, and receiving the transmitted ultrasonic signal by the ultrasonic transducer on the other side of the measuring passage after the ultrasonic signal passes through the guided wave structure, the wall of the hose and the liquid; when the ultrasonic transducers on two sides of the measuring passage are used as an ultrasonic transmitter and an ultrasonic receiver in turn, the time difference and the phase difference of the ultrasonic signals advancing along the liquid countercurrent direction and the ultrasonic signals advancing along the downstream direction in the liquid are in direct proportion to the flow rate of the liquid in the hose, and the time difference or the phase difference can be calculated by the ultrasonic flow measuring module, so that the flow rate of the liquid in the hose is measured, and the instantaneous flow of the liquid in the hose is calculated by the time difference or the phase difference and the cross sectional area of the hose; compared with the clamping type ultrasonic flow sensor in the prior art, the structure of the invention is simple, the operation and the installation are convenient, and the production cost is lower.
Drawings
Fig. 1 is a schematic structural diagram of a clamp-on ultrasonic flow sensor according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a clamp-on ultrasonic flow sensor according to an embodiment of the present invention after being installed on a hose;
FIG. 3 is a schematic diagram illustrating the propagation direction of an ultrasonic signal in a clamp-on ultrasonic flow sensor according to an embodiment of the present invention;
fig. 4 is a schematic view illustrating an installation structure of an ultrasonic transducer in a clamp-type ultrasonic flow sensor according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a wave guiding structure in a clamped ultrasonic flow sensor according to a second embodiment of the present invention;
fig. 6 is a schematic view of a guided wave structure in a clamp-type ultrasonic flow sensor according to a third embodiment of the present invention;
fig. 7 is a schematic view of a guided wave structure in a clamp-type ultrasonic flow sensor according to a fourth embodiment of the present invention;
fig. 8 is a schematic diagram of a wave guiding structure in a clamp-type ultrasonic flow sensor according to a fifth embodiment of the present invention;
wherein the reference numbers are:
101-a housing; 102-an upper cover; 103-buckling; 104-measurement path; 105-a first pin; 106-a second pin; 107-electrical connections; 201-a hose; 301-ultrasonic transducers; 301A-first ultrasonic transducer; 301B-a second ultrasonic transducer; 401-ultrasonic transducer mounting groove; 501-guided wave structure.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
Fig. 1 is a schematic structural diagram of a clamp-type ultrasonic flow sensor provided in the first embodiment, fig. 2 is a schematic structural diagram of the clamp-type ultrasonic flow sensor provided in the first embodiment after a hose is installed, fig. 3 is a schematic structural diagram of a propagation direction of an ultrasonic signal in the clamp-type ultrasonic flow sensor provided in the first embodiment, and fig. 4 is a schematic structural diagram of an ultrasonic transducer in the clamp-type ultrasonic flow sensor provided in the first embodiment. This embodiment provides a centre gripping formula ultrasonic flow sensor, is applicable to centre gripping minor diameter hose, easy operation, installation convenient, measurement accuracy is high and manufacturing cost is lower, wherein includes: casing, upper cover, two ultrasonic transducer, guided wave structure and ultrasonic wave flow measurement module.
Referring to fig. 1, a groove is formed on a housing 101, and a buckle 103 is disposed at a first end of the housing 101; the first end of upper cover 102 is connected with the second end of casing 101 is rotated, the second end of upper cover 102 and buckle 103 lock and cover the recess, thereby form and measure passageway 104, measure passageway 104 is used for holding a hose, the hose is the transport pipe way of liquid, the width of measuring passageway 104 is less than the pipe diameter under the hose natural state, specifically measure the width of passageway 104 and be the width of measuring passageway 104 along the first end of casing 101 to the second end of casing 101, the pipe diameter under the hose natural state means when not using external force to act on the hose, the hose is along the maximum size at self radial both ends, when being circular to the cross-section of hose, the pipe diameter of hose is the diameter of hose. Generally, the width and height of the measuring passage 104 are required to be smaller than the pipe diameter of the hose, and the cross section of the measuring passage 104 is a combination of one or more of a square, a rectangle, a circle or an ellipse; in this embodiment, the preferred cross section of the measuring channel 104 is square, and the side length of the square is smaller than the pipe diameter of the hose, so as to ensure that the hose is tightly coupled with the side wall of the measuring channel 104 due to extrusion deformation after the upper cover 102 is closed; and two corners at the bottom of the square are rounded corners, so that the measuring passage 104 is in full contact with the hose. For hoses with different pipe diameters, the widths of the corresponding measuring passages 104 are different, so that the width of the measuring passages 104 needs to be matched with the pipe diameter of the hose to deform the hose.
Further, the clamp-type ultrasonic flow sensor further includes a first pin 105 and a second pin 106, and the first pin 105 rotatably connects the first end of the upper cover 102 with the second end of the housing 101 to ensure that the upper cover 102 can rotate around the housing 101. The catch 103 is connected to the first end of the housing 101 via the second pin 106, the second end of the upper cover 102 is caught by the catch 103, and the upper cover 102 can be opened by pressing the catch 103. In the present embodiment, the upper cover 102 and the latch 103 are respectively connected to the housing 101 by pins, but the present invention is not limited thereto, and other connection structures may be used.
Referring to fig. 2, after the flexible tube 201 is installed in the measurement passage 104, the upper cover 102 is engaged with the buckle 103, and the flexible tube 201 is pressed to be tightly attached to the measurement passage 104. The ultrasonic signal is reflected at the interface of the solid and the gas due to the mismatching of the acoustic impedance, so that the high-frequency ultrasonic signal generated by the ultrasonic transducer is difficult to transmit from one medium into another medium. If the flexible tube 201 is not squeezed, an air gap exists between the flexible tube 201 and the measurement channel 104, and the ultrasonic signal is difficult to transmit through different media, so that accurate detection is difficult to achieve, so that the flexible tube 201 needs to be squeezed to enable the measurement channel 104 to be sufficiently attached to the flexible tube 201, the air gap is eliminated, good acoustic coupling is obtained, and the ultrasonic signal can be smoothly transmitted through the flexible tube 201 and the liquid in the flexible tube 201. Therefore, the width of the measuring passage 104 is smaller than the pipe diameter of the hose 201 in a natural state, the hose 201 is squeezed and deformed after the upper cover 102 is buckled with the buckle 103, the outer surface of the hose 201 is tightly attached to the side wall of the measuring passage 104, and good acoustic coupling is obtained, so that the measuring accuracy of the clamping type ultrasonic flow sensor is improved.
Referring to fig. 3 and 4, two ultrasonic transducers 301 are disposed on a surface of the casing 101 different from the groove and located on two sides of the measuring passage 104, respectively, and the two ultrasonic transducers 301 transmit and receive ultrasonic signals, and the propagation direction of the ultrasonic signals forms an angle with the flowing direction of the liquid in the flexible pipe 201. Specifically, if the surface of the casing 101 on which the groove is formed is the front surface of the casing 101, two ultrasonic transducers 301 are disposed on the back surface of the casing 101, and the two ultrasonic transducers 301 are located on two sides of the measurement path 104. The two ultrasound transducers 301 are generally rectangular, square or circular sheet-like structures, and the dimensions of the length, width, side length or diameter of the ultrasound transducers 301 are usually much larger than the thickness of the ultrasound transducers 301. In practical cases, two opposite surfaces of the two ultrasonic transducers 301 are parallel or approximately parallel. In the present embodiment, the preferred relative positions between the two ultrasonic transducers 301 are: an ultrasonic wave beam emitted by one ultrasonic transducer 301 passes through the wave guide structure, the hose and liquid in the hose and then reaches the other ultrasonic transducer 301, and at the moment, the center of the ultrasonic wave beam is overlapped with the center of the other ultrasonic transducer 301 as much as possible so that the intensity of an ultrasonic signal received by the other ultrasonic transducer 301 is larger, and the measurement accuracy is improved.
In this embodiment, the ultrasonic transducer 301 may be a piezoelectric ceramic plate or a piezoelectric crystal ultrasonic transducer 301 with a piezoelectric effect, or may be an ultrasonic transducer 301 made of a plastic material with a piezoelectric effect, such as PVDF (polyvinylidene fluoride), or may be a CMUT (capacitive micromachined ultrasonic transducer) or a PMUT (piezoelectric micromachined ultrasonic transducer) or a MEMS (micro-electro-mechanical system) transducer, and the specific type of the ultrasonic transducer 301 is not limited in this embodiment.
Further, the wave guiding structure is located between the measurement path 104 and the corresponding ultrasonic transducer 301, and connects the measurement path 104 and the corresponding ultrasonic transducer 301 to transmit the ultrasonic signal emitted by the ultrasonic transducer 301. Since the ultrasonic signal is reflected at the interface where the solid and the gas intersect because of the mismatch of the acoustic impedance, the high-frequency ultrasonic signal generated by the ultrasonic transducer is difficult to be transmitted from one medium into another medium, and therefore a wave guide structure is required for guiding the transmission of the ultrasonic signal. In this embodiment, the housing 101 is a solid structure, the two ultrasonic transducers 301 are embedded in the housing 101, and the housing between the ultrasonic transducers 301 and the measurement channel 104 is a wave guide structure. Specifically, the housing 101 is provided with an ultrasonic transducer mounting groove 401, and the two ultrasonic transducers 301 are embedded in the ultrasonic transducer mounting groove 401, so that the wave guiding structure is the housing 101 between the front of the two ultrasonic transducers 301 and the measurement passage 104.
An ultrasonic flow measurement module (not shown) is electrically connected to the two ultrasonic transducers 301 for measuring the flow rate of the liquid in the hose 201 according to the time difference or phase difference of the ultrasonic signals received by the two ultrasonic transducers 301.
The measurement process of the clamping type ultrasonic flow sensor provided by the embodiment is as follows: the flexible tube 201 is put into the measuring passage 104, the upper cover is fastened, and the flexible tube 201 is deformed by the pressing of the upper cover so as to be tightly coupled with the side wall of the measuring passage 104. The ultrasonic flow measurement module generates a high-frequency voltage pulse and applies the high-frequency voltage pulse to the ultrasonic transducer 301, and if the high-frequency voltage pulse is applied to the first ultrasonic transducer 301A, the high-frequency ultrasonic signal is generated, the first ultrasonic transducer 301A emits an ultrasonic signal, the ultrasonic signal propagates along a wave guide structure between the first ultrasonic transducer 301A and the measurement passage 104, then sequentially passes through a tube wall on one side of the hose 201, liquid in the hose 201 and a tube wall on the other side of the hose 201, and then is received by the second ultrasonic transducer 301B and then is transmitted to the ultrasonic flow measurement module through a wave guide structure between the second ultrasonic transducer 301B and the measurement passage 104; in fig. 3, the direction of the arrow from the first ultrasonic transducer 301A to the second ultrasonic transducer 301B is the propagation direction of the ultrasonic signal. Subsequently, the ultrasonic flow measurement module generates a high-frequency voltage pulse, and applies the high-frequency voltage pulse to the second ultrasonic transducer 301B, so that the second ultrasonic transducer 301B generates a high-frequency ultrasonic signal, the second ultrasonic transducer 301B transmits the ultrasonic signal to the first ultrasonic transducer 301A through an opposite propagation path, the first ultrasonic transducer 301A receives the ultrasonic signal and transmits the ultrasonic signal to the ultrasonic flow measurement module, and in fig. 3, the direction of an arrow from the second ultrasonic transducer 301B to the first ultrasonic transducer 301A is the propagation direction of the ultrasonic signal.
Since there is a difference between the propagation time of the ultrasonic signal transmitted by the first ultrasonic transducer 301A and the propagation time of the ultrasonic signal transmitted by the second ultrasonic transducer 301B when the liquid in the hose 201 flows, the time difference or the phase difference between the two propagating ultrasonic signals is proportional to the liquid flow speed, so as to measure the flow speed of the liquid, and the instantaneous flow rate of the liquid can be calculated according to the time difference or the phase difference and the cross-sectional area of the hose 201. The ultrasonic signals received twice are transmitted to the ultrasonic flow measurement module, the ultrasonic flow measurement module amplifies and filters the received ultrasonic signals, the received ultrasonic signals are further processed to calculate the time difference or the phase difference of the two transmitted ultrasonic signals, the flow speed of the liquid is obtained, and the instantaneous flow of the liquid can be calculated according to the time difference or the phase difference and the cross-sectional area of the hose.
Further, in this embodiment, the clip-on ultrasonic flow sensor further includes an electrical connector 107, the electrical connector 107 is disposed on the housing 101, and the ultrasonic flow measurement module may be integrated inside the housing 101, or externally disposed in a separate package and electrically connected to the ultrasonic transducer 301 through the electrical connector 107.
Further, in the present embodiment, the preferable diameter range of the hose 201 is 3mm-30mm, but the hose is not limited to this diameter range, and is also suitable for hoses with larger diameter. The material of the hose 201 may be plastic such as PVC (polyvinyl chloride), teflon, PFA (a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), or rubber such as Silicone or Polyurethane, and the hose made of the material may be deformed under the external pressure. Hose 201 may be coated with a thin layer of grease or other acoustic couplant prior to placement in measurement passageway 104 to lubricate its surface to facilitate placement in measurement passageway 104 and to enhance acoustic coupling. The surface of the hose 201 may also be "dry coupled" without the coupling agent, and the inner and outer surfaces of the hose 201 are generally smooth, but may have a micro-texture. The material of the hose 201 generally does not include a woven material, but may work with some woven materials that are uniform in texture.
Further, the material of the housing 101 includes one or more of plastic, metal or composite material. In this embodiment, the housing 101 is integrally formed, the housing 101 includes the ultrasonic transducer mounting groove 401, the measurement passage 104, the pin mounting hole, the electrical connector 107 mounting hole, and the like, and the housing 101 may be formed by CNC (computer numerical control) machining, injection molding, or 3D printing one-time molding. In practical applications, the housing 101 may be formed by separately processing a plurality of components and then assembled together by mechanical connection, ultrasonic welding, or glue bonding.
The centre gripping formula ultrasonic flow sensor in this embodiment can conveniently and high-efficiently grasp the hose from the outside through the cooperation of casing, upper cover and buckle to ultrasonic transducer transmission ultrasonic signal through one side, ultrasonic signal passes behind guided wave structure, hose pipe wall and the liquid, and ultrasonic signal is received by the ultrasonic transducer of opposite side. When the ultrasonic transducers on the two sides are used as an ultrasonic transmitter and an ultrasonic receiver in turn, the propagation time difference or phase difference of the ultrasonic signals advancing along the countercurrent direction and the ultrasonic signals advancing along the downstream direction of the liquid in the liquid is in direct proportion to the flow rate of the liquid, and the time difference or the phase difference can be calculated by the ultrasonic flow measurement module and the instantaneous flow of the liquid in the hose can be deduced. The embodiment is suitable for high-precision flow measurement of liquid in a small-diameter hose, and compared with a clamping type ultrasonic flow sensor in the prior art, the structure in the embodiment is simple in structure, low in production cost and simple to operate and install.
Example two
Fig. 5 is a schematic view of a guided wave structure in a clamped ultrasonic flow sensor according to a second embodiment, please refer to fig. 5, where the difference between the second embodiment and the first embodiment is: the housing 101 of the ultrasonic flow sensor in this embodiment is a hollow structure, and specifically, the region corresponding to the two side walls of the measurement passage 104 is a non-solid structure. A wave guide structure 501 is respectively arranged between the measurement channel 104 and the two ultrasonic transducers 301, the wave guide structure 501 is a solid structure, the wave guide structure 501 is a quadrangle, and any side of the quadrangle is superposed with the side wall of the measurement channel 104; the wave guiding structure 501 may also be triangular, with either side of the triangle coinciding with a side wall of the measurement channel 104. In this embodiment, the wave guiding structure 501 is a right trapezoid, the hypotenuse of the right trapezoid coincides with the sidewall of the measurement via 104, and the height of the wave guiding structure 501 may be the same as the sidewall of the measurement via 104, or may be smaller than the sidewall of the measurement via 104 or larger than the sidewall of the measurement via 104. The guided wave structure 501 can guide the ultrasonic signal emitted by the ultrasonic transducer 301 to propagate forward along the guided wave structure 501, and the ultrasonic signal cannot be dispersed all around, so that the energy can be more concentrated, the energy of the received ultrasonic signal is stronger, and the measurement precision is further improved.
Specifically, the waveguide structure 501 and the housing 101 are integrally formed, or may be separately formed from the housing 101 and then assembled together by mechanical connection, ultrasonic welding, or an acoustic coupling agent.
EXAMPLE III
Fig. 6 is a schematic view of a guided wave structure in a clamp-type ultrasonic flow sensor provided in the third embodiment, please refer to fig. 6, where the difference between the third embodiment and the second embodiment is: the shape of the wave guiding structure 501 is different.
Specifically, the width of the guided wave structure 501 in this embodiment gradually increases along the direction from the measurement path 104 to the ultrasonic transducer 301, and the guided wave structure 501 is a quadrangle, and any side of the quadrangle coincides with a side wall of the measurement path 104. That is, the guided wave structure 501 contacts the measuring channel 104 with a narrow end, the guided wave structure 501 contacts the ultrasonic transducer 301 with a wide end, the guided wave structure 501 in the embodiment makes the transmitting energy of the ultrasonic wave more concentrated, the density of the ultrasonic signal is improved, the energy of the ultrasonic wave passing through the pipeline and the liquid is stronger, the received ultrasonic signal is stronger, the signal-to-noise ratio is higher, and the measuring precision is further improved. And the guided wave structure 501 in the present embodiment can use the ultrasonic transducer 301 of a larger size. Larger size ultrasonic transducers 301 produce higher energy ultrasonic signals.
The waveguide structure 501 and the housing 101 are integrally formed, or may be separately formed from the housing 101 and then assembled together by mechanical connection, ultrasonic welding, or acoustic coupling agent.
Example four
Fig. 7 is a schematic diagram of a wave guiding structure in a clamp-type ultrasonic flow sensor according to a fourth embodiment, please refer to fig. 7, the difference between the fourth embodiment and the second embodiment is: the wave guiding structure 501 is a ring, the wave guiding structure 501 is a quadrilateral ring, and any side of the quadrilateral ring coincides with the side wall of the measurement channel 104, and the wave guiding structure 501 may also be a triangular ring, and any side of the triangular ring coincides with the side wall of the measurement channel 104. In this embodiment, the wave guiding structure 501 is a ladder-shaped ring, the inclined edge of the ladder-shaped ring coincides with the side wall of the measurement passage 104, and the height of the wave guiding structure 501 may be the same as the height of the side wall of the measurement passage 104, or may be smaller than the height of the side wall of the measurement passage 104 or larger than the height of the side wall of the measurement passage 104.
The wave guide structure 501 has a housing, and the housing is filled with one or more of silica gel, rubber, resin, plastic, mixed metal powder, ceramic powder, glass powder, micro hollow glass spheres, or micro hollow plastic spheres, or the housing may be filled with a liquid such as pure water, saline, or oil, and the liquid may be sealed therein with a cap. The guided wave structure 501 filled with suitable materials can guide the ultrasonic signals transmitted by the ultrasonic transducer to forward propagate along the guided wave structure 501, and the ultrasonic signals can not be dispersed all around, so that the energy can be more concentrated, the energy of the received ultrasonic signals is stronger, the measurement precision is further improved, and the density and the sound velocity of the filling materials can be adjusted to optimize and match the acoustic impedance of the liquid to be measured, so that the ultrasonic signals can be further enhanced, and the measurement precision is improved.
In this embodiment, the ultrasonic transducer may be mounted in a hollow region inside the housing of the waveguide structure 501, or may be mounted outside the waveguide structure 501 as in the first embodiment.
The waveguide structure 501 and the housing 101 are integrally formed, or may be separately formed from the housing 101 and assembled together by mechanical connection, ultrasonic welding, or acoustic coupling agent.
EXAMPLE five
Fig. 8 is a schematic diagram of a wave guiding structure in a clamped ultrasonic flow sensor according to a fifth embodiment, please refer to fig. 8, where the difference between the fifth embodiment and the fourth embodiment is: the shape of the wave guiding structure 501 is different.
Specifically, the width of the wave guiding structure 501 in this embodiment gradually increases along the direction from the measurement path 104 to the ultrasonic transducer 301, and the wave guiding structure 501 is a quadrilateral ring, and any side of the quadrilateral ring coincides with the side wall of the measurement path 104; that is, the end of the guided wave structure 501 contacting the measurement channel 104 is narrow, and the end of the guided wave structure 501 contacting the ultrasonic transducer is wide.
The waveguide structure 501 has a housing, and the housing is filled with one or more of silica gel, rubber, resin, plastic, mixed metal powder, ceramic powder, glass powder, micro hollow glass spheres, or micro hollow plastic spheres, or the housing may be filled with a liquid such as pure water, saline, or oil, and the liquid is sealed therein with a cap. The guided wave structure 501 filled with suitable materials can also guide the propagation of ultrasonic signals, the guided wave structure 501 in the embodiment enables the emission energy of ultrasonic waves to be more concentrated, the density of the ultrasonic signals is improved, the energy of the ultrasonic waves passing through a pipeline and liquid is stronger, the received ultrasonic signals are stronger, the signal to noise ratio is higher, and the measurement precision is further improved. In addition, the guided wave structure 501 in this embodiment may use an ultrasonic transducer with a larger size, the ultrasonic transducer with the larger size may generate an ultrasonic signal with higher energy, and the density and the sound velocity of the filling material may be adjusted to optimize and match the acoustic impedance of the filling material with the acoustic impedance of the liquid to be measured, so that the ultrasonic signal may be further enhanced, and the measurement accuracy may be improved.
In the present embodiment, the ultrasonic transducer may be mounted in a hollow region inside the housing of the wave guiding structure 501, or may be mounted outside the wave guiding structure 501 as in the first embodiment.
The waveguide structure and the housing 101 are integrally formed, or may be separately formed from the housing 101 and then assembled together by mechanical connection, ultrasonic welding, or acoustic coupling agent.
In summary, in the clamping-type ultrasonic flow sensor provided by the invention, the housing is provided with a groove, and the first end of the housing is provided with the buckle; the first end of the upper cover is rotatably connected with the second end of the shell, the second end of the upper cover is buckled with the buckle and covers the groove, so that a measuring passage is formed, the measuring passage is used for accommodating a hose, the ultrasonic flow sensor is not directly contacted with liquid in the hose, non-invasive measurement is realized, and cross contamination can not be formed; because the width of the measuring passage is smaller than the pipe diameter of the hose in a natural state, the hose is placed in the measuring passage, and is clamped and deformed, so that the hose and the measuring passage form good acoustic coupling, and the measuring precision of the ultrasonic flow sensor is improved; the two ultrasonic transducers are arranged on the surface of the shell, which is different from the groove, and are respectively positioned on the two sides of the measuring passage; the two ultrasonic transducers can transmit and receive ultrasonic signals mutually, and the propagation direction of the ultrasonic signals has an angle with the flowing direction of liquid in the hose, so that the ultrasonic signals propagating along the forward flow direction and the backward flow direction have a time difference or a phase difference; the guided wave structure is positioned between the measuring passage and the corresponding ultrasonic transducer and is connected with the measuring passage and the corresponding ultrasonic transducer so as to transmit the ultrasonic signal emitted by the ultrasonic transducer; transmitting an ultrasonic signal through an ultrasonic transducer on one side of the measuring passage, and receiving the transmitted ultrasonic signal by the ultrasonic transducer on the other side of the measuring passage after the ultrasonic signal passes through the guided wave structure, the wall of the hose and the liquid; the ultrasonic flow measuring module is electrically connected with the ultrasonic transducers, when the ultrasonic transducers on two sides of the measuring passage are used as an ultrasonic transmitter and an ultrasonic receiver in turn, the time difference and the phase difference of the ultrasonic signals advancing along the countercurrent direction and the downstream direction of the liquid in the liquid are in direct proportion to the flow velocity of the liquid in the hose, and the time difference or the phase difference can be calculated by the ultrasonic flow measuring module, so that the flow velocity of the liquid in the hose is measured, and the instantaneous flow of the liquid in the hose is calculated by the time difference and the cross sectional area of the hose; compared with the clamping type ultrasonic flow sensor in the prior art, the structure of the invention is simple, the operation and the installation are convenient, and the production cost is lower. In addition, the strength of the ultrasonic signals can be effectively increased under different application conditions through different designs of the guided wave structure, so that the influence of environmental noise on the ultrasonic signals is reduced, the error of flow velocity calculation is reduced, and the measurement precision is further improved.
The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any person skilled in the art can make any equivalent substitutions or modifications on the technical solutions and technical contents disclosed in the present invention without departing from the scope of the technical solutions of the present invention, and still fall within the protection scope of the present invention without departing from the technical solutions of the present invention.
Claims (8)
1. A clamp-on ultrasonic flow sensor, comprising:
the clamping device comprises a shell, a clamping piece and a clamping piece, wherein a groove is formed in the shell, a buckle is arranged at the first end of the shell, and the shell is of a solid structure or a hollow structure;
the first end of the upper cover is rotatably connected with the second end of the shell, the second end of the upper cover is buckled with the buckle and covers the groove, so that a measuring passage is formed and is used for accommodating a hose, and the width of the measuring passage is smaller than the pipe diameter of the hose in a natural state;
the two ultrasonic transducers are arranged on one surface of the shell, which is different from the groove, and are respectively positioned on two sides of the measuring passage, the two ultrasonic transducers transmit and receive ultrasonic signals mutually, and the propagation direction of the ultrasonic signals forms an angle with the flowing direction of the liquid in the hose;
the guided wave structure is positioned between the measuring passage and the corresponding ultrasonic transducer and is connected with the measuring passage and the corresponding ultrasonic transducer so as to transmit an ultrasonic signal emitted by the ultrasonic transducer, when the shell is of a hollow structure, the guided wave structure is of a solid structure, and the width of the guided wave structure is gradually increased along the direction from the measuring passage to the ultrasonic transducer;
and the ultrasonic flow measuring module is electrically connected with the ultrasonic transducers and used for measuring the flow speed of the liquid in the hose according to the time difference or the phase difference of the ultrasonic signals received by the two ultrasonic transducers.
2. The clamp-on ultrasonic flow sensor of claim 1, wherein the cross-section of the measurement channel is a combination of one or more of a square, a rectangle, a circle, or an ellipse.
3. The clamp-on ultrasonic flow sensor of claim 1 wherein when the housing is a solid structure, both of the ultrasonic transducers are embedded in the housing, and the housing between the ultrasonic transducers and the measurement channel is the guided wave structure.
4. The clamp-on ultrasonic flow sensor of claim 1 wherein the wave guide structure is a quadrilateral when the housing is a hollow structure, any side of the quadrilateral coinciding with a side wall of the measurement channel.
5. The clamp-on ultrasonic flow sensor of claim 1 wherein the wave guide structure is triangular when the housing is hollow, and either side of the triangle coincides with a side wall of the measurement channel.
6. The clamp-on ultrasonic flow sensor of claim 1, wherein the wave guide structure is annular when the housing is hollow.
7. The clamp-on ultrasonic flow sensor of claim 6, wherein the wave guiding structure is a quadrilateral ring, either side of the quadrilateral ring coinciding with a side wall of the measurement passage.
8. The clamp-on ultrasonic flow sensor of claim 7, wherein the wave guiding structure has a housing filled with one or more of water, oil, resin, rubber, silicone, gel, mixed metal powder, ceramic powder, glass powder, hollow glass spheres, or hollow plastic spheres.
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| CN201965117U (en) * | 2010-12-23 | 2011-09-07 | 中国石油天然气股份有限公司 | Remote pipe imaging system based on guided wave focused scanning |
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| JP2003075219A (en) * | 2001-09-06 | 2003-03-12 | Kazumasa Onishi | Clamp-on ultrasonic flowmeter |
| CN201166567Y (en) * | 2008-02-25 | 2008-12-17 | 天津市盛世九合科技发展有限公司 | Supersonic wave-guiding flow sensor |
| EP3273205B1 (en) * | 2016-07-18 | 2019-11-20 | Flexim Flexible Industriemesstechnik Gmbh | Method and assembly for ultrasound clamp on flow measurement and body for realizing the measurement |
| JP6917929B2 (en) * | 2018-03-14 | 2021-08-11 | 株式会社キーエンス | Clamp-on type ultrasonic flow sensor |
| CN109443463A (en) * | 2018-11-12 | 2019-03-08 | 上海市肺科医院 | It is a kind of for monitoring the flow-monitoring device of intrathoracic drain flow in real time |
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| CN111380584B (en) * | 2020-04-16 | 2022-02-15 | 上海迅音科技有限公司 | Ultrasonic flowmeter |
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| CN201965117U (en) * | 2010-12-23 | 2011-09-07 | 中国石油天然气股份有限公司 | Remote pipe imaging system based on guided wave focused scanning |
| CN211505333U (en) * | 2019-11-27 | 2020-09-15 | 华东理工大学 | Nonlinear ultrasonic guided wave detection device |
| CN111999392A (en) * | 2020-07-22 | 2020-11-27 | 清华大学 | Submarine pipeline ultrasonic guided wave omnidirectional focusing acoustic lens flexible transducer and detection method |
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