Rectification structure of ultrasonic flowmeter and ultrasonic flowmeter

Abstract

The utility model provides a rectification structure of an ultrasonic flowmeter and the ultrasonic flowmeter, and particularly relates to the technical field of fluid flow. The rectification structure of the ultrasonic flowmeter comprises a shell, a first pore plate and a flow guide part. Wherein a conical flow channel is formed in the shell, and the conical flow channel is provided with a first end and a second end. The first pore plate is located on one side of the shell, the first pore plate is arranged close to the first end of the conical flow channel, a plurality of through holes are formed in the first pore plate, and the through holes communicate with the conical flow channel. At least part of the flow guide part and the first end form a first expanding section, at least part of the flow guide part and the second end form a reducing section, at least part of the flow guide part and at least part of the shell form a second expanding section, and the sectional area size of fluid flowing through the reducing section is smaller than that of the first expanding section and that of the second expanding section. By the adoption of the variable-diameter flow channel design, fluid is refracted at the variable-diameter position, so that noise interference is effectively reduced, and the adaptability of the ultrasonic flowmeter to various installation scenes is improved.

Description

Technical Field

[0001] This application relates to the field of fluid flow technology, and in particular to a rectifying structure for an ultrasonic flow meter and the ultrasonic flow meter itself. Background Technology

[0002] An ultrasonic flow meter is an instrument that uses ultrasonic technology to measure the flow rate of fluids. It determines the flow rate by measuring the propagation time difference of ultrasonic signals in the fluid. It is widely used in water treatment, petrochemicals, natural gas, and other fields.

[0003] The primary instrumentation section of an ultrasonic flowmeter significantly impacts its performance and accuracy. It directly contacts the fluid being measured or is installed on the pipeline, responsible for generating, receiving, and processing ultrasonic signals. The primary instrumentation section mainly consists of a metering section and a rectification section. The metering section primarily houses the sensor and data sampling components, while the rectification section comprises rectification components and flow channels. A rectification section is typically designed at the inlet, through which the fluid passes before entering the metering section. The rectification section's function is primarily to regulate the flow field, maximizing the stability of the fluid reaching the metering section and bringing it close to an ideal state, thereby ensuring the accuracy and stability of the measurement.

[0004] In existing ultrasonic flowmeter structures, the rectifying section typically consists of a metal orifice plate and a honeycomb structure, arranged sequentially in the flow channel using a combination of round holes and thin tubes to regulate the fluid flow. However, the rectifying section primarily serves a rectifying function and does not effectively eliminate noise. This can easily lead to the metering section receiving significant background noise and a deteriorating signal-to-noise ratio, potentially resulting in large measurement errors or even rendering the ultrasonic flowmeter unusable. Utility Model Content

[0005] This application provides a rectifying structure for an ultrasonic flow meter and the ultrasonic flow meter itself. A variable-diameter flow channel design is employed, causing fluid refraction at the diameter change point, thereby eliminating some noise. Combined with a first orifice plate structure, noise interference is effectively reduced and the signal-to-noise ratio is improved while ensuring flow field stability, thus enhancing the adaptability of the ultrasonic flow meter to various installation scenarios.

[0006] The first aspect of this application provides a rectifying structure for an ultrasonic flow meter, comprising:

[0007] The shell has a conical flow channel inside, and the conical flow channel has a first end and a second end;

[0008] The first perforated plate is located on one side of the shell and is positioned close to the first end of the conical flow channel. Several through holes are formed on the first perforated plate, and the through holes are connected to the conical flow channel.

[0009] The guide section, at least a portion of the guide section and the first end of the conical flow channel form a first expansion section, at least a portion of the guide section and the second end of the conical flow channel form a reduction section, and at least a portion of the guide section and at least a portion of the shell form a second expansion section;

[0010] The cross-sectional area of ​​the fluid flowing through the narrowing section is smaller than the cross-sectional area of ​​the first expanding section and the cross-sectional area of ​​the second expanding section.

[0011] The rectification structure of the ultrasonic flowmeter provided in the first aspect of this application includes a housing, a first orifice plate, and a flow guide. A conical flow channel is formed inside the housing, having a first end and a second end. The first orifice plate is located on one side of the housing and is positioned near the first end of the conical flow channel. The first orifice plate has several through holes that communicate with the conical flow channel. At least a portion of the flow guide and the first end of the conical flow channel form a first expansion section, at least a portion of the flow guide and the second end of the conical flow channel form a contraction section, and at least a portion of the flow guide and at least a portion of the housing form a second expansion section. The cross-sectional area of ​​the fluid flowing through the contraction section is smaller than the cross-sectional areas of the first and second expansion sections. Thus, the rectification structure of the ultrasonic flowmeter provided in this application employs a variable-diameter flow channel design, causing the fluid to refract at the diameter change point, thereby eliminating some noise. Combined with the first orifice plate structure, noise interference is effectively reduced and the signal-to-noise ratio is improved while ensuring a stable flow field, thereby enhancing the adaptability of the ultrasonic flowmeter to various installation scenarios.

[0012] In one possible implementation, the flow guide includes a flow guide shroud, a second perforated section, and a sound-absorbing section arranged sequentially along the fluid flow direction;

[0013] The end of the flow guide facing the first perforated plate has a pointed part, one end of the second perforated section is connected to the flow guide, and the other end of the second perforated section is connected to the sound-absorbing part;

[0014] The section where the flow guide shroud connects to the second orifice section and the second end of the conical flow channel forms a reduced diameter section.

[0015] In one possible implementation, the cross-sectional area of ​​the end of the flow guide facing the second orifice is the same as the cross-sectional area of ​​the second orifice and the cross-sectional area of ​​the sound-absorbing part in the radial direction.

[0016] In one possible implementation, the through hole includes a first through hole and a second through hole;

[0017] Several first through holes are located near the center of the first perforated plate and are distributed circumferentially, while several second through holes are distributed circumferentially along the edge of the first perforated plate. The diameter of the first through holes is greater than or equal to the diameter of the second through holes.

[0018] In one possible implementation, the through hole further includes a third through hole, the diameter of which is less than or equal to the diameter of the second through hole;

[0019] Several third through holes are located in the gap between the circumferentially distributed second through holes and the first through holes, so that the third through holes are circumferentially distributed.

[0020] In one possible implementation, a plurality of fourth through holes are provided on the sidewall of the second hole section, and each fourth through hole is connected to the internal cavity of the second hole section.

[0021] The fluid flows sequentially along the narrowing section and the second widening section and enters the internal cavity of the second section through the fourth through hole.

[0022] The sound-absorbing part has several channels, which are evenly distributed along the circumferential direction of the sound-absorbing part. Each channel is connected to the internal cavity of the second section.

[0023] In one possible implementation, the cross-sectional area of ​​the second end of the tapered flow channel is greater than or equal to the cross-sectional area of ​​the first end of the tapered flow channel, so that the tapered flow channel is arranged in an inclined manner.

[0024] The tilt angle of the conical flow channel is less than or equal to the tilt angle of the tip of the flow guide.

[0025] In one possible implementation, the housing includes a first housing and a second housing, the first housing including a tapered flow channel, and the second housing including a second expansion section;

[0026] The second housing has a stepped portion located at one end of the second enlarged section facing away from the first enlarged section. The second hole section and the stepped portion abut against each other, and the sidewall of the second hole section and the stepped portion are fixedly connected.

[0027] A second aspect of this application provides an ultrasonic flow meter, comprising:

[0028] Measurement structure;

[0029] The ultrasonic flow meter's rectification structure is connected to the metering structure.

[0030] In one possible implementation, the metering structure and the sound-absorbing part of the rectifying structure of the ultrasonic flow meter are connected.

[0031] It should be understood that the second aspect of this application corresponds to the technical solution of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here.

[0032] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, the rectification structure of an ultrasonic flow meter provided by this application, other technical problems that the ultrasonic flow meter can solve, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only a part of the embodiments of this application. These drawings and text descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a partial structural schematic diagram of an ultrasonic flow meter provided in an embodiment of this application;

[0035] Figure 2 A front view of an ultrasonic flow meter provided in an embodiment of this application;

[0036] Figure 3 A schematic diagram of the rectification structure of the ultrasonic flow meter provided in the embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the sound-absorbing part in the rectification structure of the ultrasonic flowmeter provided in the embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100-Rectifying structure of ultrasonic flow meter;

[0040] 200 - Shell; 210 - Conical flow channel; 211 - First end; 212 - Second end; 213 - First expansion section; 214 - Reduction section; 220 - Second expansion section; 230 - First shell; 240 - Second shell; 241 - Stepped section;

[0041] 300 - First through hole; 310 - Through hole; 311 - First through hole; 312 - Second through hole; 313 - Third through hole;

[0042] 400 - Flow guide section; 410 - Flow guide cover; 411 - Tip section; 420 - Second hole section; 421 - Fourth through hole; 430 - Sound absorption section; 431 - Channel; 432 - Small hole;

[0043] 500-Ultrasonic Flow Meter;

[0044] 600-Metrology Structure. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] As described in the background section, in existing ultrasonic flowmeter structures, the rectifying section is generally composed of a metal orifice plate and a honeycomb structure, which are arranged sequentially in the flow channel using a combination of round holes and thin tubes to regulate the fluid state. However, the rectifying section mainly serves a rectifying function and does not effectively eliminate noise. This can easily cause the metering section to receive a large amount of background noise, resulting in a poor signal-to-noise ratio, which may lead to large measurement errors in the ultrasonic flowmeter or even render it unusable.

[0047] To address the aforementioned technical problems, this application provides a rectifying structure for an ultrasonic flow meter and an ultrasonic flow meter itself. The rectifying structure of the ultrasonic flow meter includes a housing, a first orifice plate, and a flow guide. A tapered flow channel is formed inside the housing, having a first end and a second end. The first orifice plate is located on one side of the housing and is positioned near the first end of the tapered flow channel. The first orifice plate has several through holes that communicate with the tapered flow channel. At least a portion of the flow guide and the first end of the tapered flow channel form a first expansion section, at least a portion of the flow guide and the second end of the tapered flow channel form a contraction section, and at least a portion of the flow guide and at least a portion of the housing form a second expansion section. The cross-sectional area of ​​the fluid flowing through the contraction section is smaller than the cross-sectional areas of the first and second expansion sections. Thus, the rectifying structure of the ultrasonic flow meter provided in this application employs a variable-diameter flow channel design, causing the fluid to refract at the diameter change point, thereby eliminating some noise. By combining the first orifice plate structure, noise interference is effectively reduced and the signal-to-noise ratio is improved while ensuring flow field stability, thereby enhancing the adaptability of the ultrasonic flow meter to various installation scenarios.

[0048] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0049] This application provides a rectifying structure for an ultrasonic flow meter and the ultrasonic flow meter itself. A variable-diameter flow channel design is employed, causing fluid refraction at the diameter change point, thereby eliminating some noise. Combined with a first orifice plate structure, noise interference is effectively reduced and the signal-to-noise ratio is improved while ensuring flow field stability, thus enhancing the adaptability of the ultrasonic flow meter to various installation scenarios. The rectifying structure and specific structure of the ultrasonic flow meter provided in this application embodiment are described below with reference to the accompanying drawings.

[0050] refer to Figure 1 This application provides a rectifying structure 100 for an ultrasonic flow meter in a first aspect. The rectifying structure 100 may include a housing 200, a first orifice plate 300, and a flow guide 400. In this embodiment, the first orifice plate 300 may be located at an end of the housing 200, the flow guide 400 is located inside the housing 200, and the first orifice plate 300 is located on one side of the flow guide 400.

[0051] refer to Figure 1 as well as Figure 2 Based on the above embodiments, a tapered flow channel 210 may be provided inside the housing 200. The tapered flow channel 210 may have a first end 211 and a second end 212. The first end 211 of the tapered flow channel 210 may be connected to the first orifice plate 300, while the second end 212 of the tapered flow channel 210 may be positioned towards the flow guide portion 400. In one possible implementation, the first orifice plate 300 may be positioned close to the first end 211 of the tapered flow channel 210 relative to the second end 212. The first orifice plate 300 may be designed according to the inlet shape of the ultrasonic flow meter. For example, the first orifice plate 300 may be a circular or square structure; this application embodiment does not impose any limitations. In the embodiments of this application, such as... Figure 2 As shown, the first perforated plate 300 is circular in structure. The first perforated plate 300 has through holes 310, and the number of through holes 310 can be multiple. In this embodiment, the number of through holes 310 is not limited. All through holes 310 can be connected to the tapered flow channel 210.

[0052] Continue to refer to Figure 2Based on the above embodiments, a portion of the outer surface of the guide portion 400 can form a first expansion section 213 between itself and the inner wall of the first end 211 of the tapered flow channel 210. Additionally, another portion of the outer surface of the guide portion 400 can form a contraction section 214 between itself and the inner wall of the second end 212 of the tapered flow channel 210. Furthermore, a portion of the outer surface of the guide portion 400 can form a second expansion section 220 between itself and at least a portion of the inner wall of the housing 200. It is understood that the cross-sectional area of ​​the fluid flowing through the contraction section 214 can be smaller than the cross-sectional areas of the first expansion section 213 and the second expansion section 220, thereby minimizing the cross-sectional area of ​​the fluid flowing through the contraction section 214. Thus, when the fluid passes through the first orifice plate 300, it flows from the first expansion section 213 to the contraction section 214, with the flow cross-sectional area gradually decreasing, causing the fluid to be gradually compressed, ultimately reaching its minimum state in the contraction section 214. Then, the fluid flows from the narrowing section 214 to the second expanding section 220, gradually increasing the flow cross-sectional area. This narrowing and expanding structure causes the fluid to become disordered inside, colliding with each other and dissipating the mechanical energy of the vibration, thereby eliminating some of the noise.

[0053] Continue to refer to Figure 1 as well as Figure 2 Based on the above embodiments, the flow guide 400 can be a split structure, and may further include a flow guide shroud 410, a second orifice section 420, and a sound-absorbing section 430. The flow guide shroud 410, the second orifice section 420, and the sound-absorbing section 430 can be arranged sequentially along the flow direction of the fluid. In one possible implementation, both the second orifice section 420 and the sound-absorbing section 430 can be cylindrical structures; this embodiment does not impose limitations. In this embodiment, both the second orifice section 420 and the sound-absorbing section 430 are cylindrical structures. One end of the second orifice section 420 can be connected to the flow guide shroud 410, and the other end can be connected to the sound-absorbing section 430. The end of the flow guide shroud 410 facing the first orifice plate 300 may have a tip 411, and the outer surface of the tip 411 and the first end 211 of the tapered flow channel 210 can form a first diameter expansion section 213. The end of the flow guide shroud 410 facing away from the first orifice plate 300 can be connected to the second orifice section 420. A reduced-diameter section 214 can be formed at the connection point between the flow guide shroud 410 and the second orifice section 420 and the second end 212 of the conical flow channel 210. This gradually reduces the flow cross-sectional area from the first expanded-diameter section 213 to the reduced-diameter section 214, causing the fluid to be gradually compressed and dissipate energy through collisions. Furthermore, a second expanded-diameter section 220 can be formed on the outer surface of the second orifice section 420 and the corresponding inner wall of the shell 200. This gradually increases the flow cross-sectional area from the reduced-diameter section 214 to the second expanded-diameter section 220, causing the fluid to become disordered internally, resulting in energy dissipation through collisions and reducing some noise.

[0054] Continue to refer to Figure 1 as well as Figure 2 Based on the above embodiments, the cross-sectional area of ​​the end of the flow guide 410 facing the second orifice 420 can be the same as the cross-sectional area of ​​the second orifice 420 and the cross-sectional area of ​​the sound-absorbing part 430 in the radial direction. This makes the connection between the flow guide 410, the second orifice 420, and the sound-absorbing part 430 smoother, avoiding gaps between them and facilitating fluid flow.

[0055] It is understandable that the fluid can collide with the guide shield 410 during the flow process, thereby forming refraction and reflection between the guide shield 410 and the conical flow channel 210, and can also form mutual collisions and consume mechanical energy, thereby eliminating some noise.

[0056] refer to Figure 3 Based on the above embodiments, the plurality of through holes 310 on the first perforated plate 300 may further include a plurality of first through holes 311 and a plurality of second through holes 312. In this embodiment, the plurality of first through holes 311 may be located close to the center of the first perforated plate 300 and uniformly distributed circumferentially around the center of the first perforated plate 300, while the plurality of second through holes 312 may be distributed circumferentially along the edge of the first perforated plate 300. In one possible implementation, the diameter of the first through holes 311 may be greater than or equal to the diameter of the second through holes 312.

[0057] Furthermore, the through-hole 310 may also include a plurality of third through-holes 313. In this embodiment, the plurality of third through-holes 313 may be located in the gap between the circumferentially distributed first through-holes 311 and second through-holes 312, thus making the plurality of third through-holes 313 also circumferentially distributed. In one possible implementation, the diameter of the second through-hole 312 may be further greater than or equal to the diameter of the third through-hole 313. In this way, after the fluid passes through the plurality of through-holes 310, large vortices can be broken down into smaller vortices. Additionally, the arrangement of the larger diameter first through-hole 311 at the center, the medium diameter second through-hole 312 at the edge, and the smaller diameter third through-hole 313 in the center can create a flow field state with low flow rate and high velocity at the edge, and high flow rate and low velocity at the center.

[0058] Continue to refer to Figure 2Based on the above embodiments, a fourth through hole 421 may be provided on the second orifice section 420. In one possible implementation, the number of fourth through holes 421 can be several; however, this application embodiment does not limit the number of fourth through holes 421. In this application embodiment, several fourth through holes 421 can be evenly distributed on the sidewall of the second orifice section 420, and each fourth through hole 421 can communicate with the internal cavity of the second orifice section 420. In this way, fluid can flow along the narrowing section 214, and when it flows to the expanding section 220, it can enter the internal cavity of the second orifice section 420 through the fourth through hole 421. After passing through the fourth through hole 421, the fluid can further eliminate vortices and redistribute the flow velocity, thereby achieving a rectification effect. It is understood that the diameter and spacing of the fourth through hole 421 can be related to the diameter of the ultrasonic flow meter to ensure optimal rectification effect under different flow rates and velocities.

[0059] Continue to refer to Figure 2 Based on the above embodiments, the sound-absorbing part 430 may be provided with channels 431. In one possible implementation, the number of channels 431 can be several; this application embodiment does not limit the number of channels 431. In this application embodiment, the several channels 431 can be evenly distributed circumferentially around the center of the sound-absorbing part 430, and each channel 431 can communicate with the internal cavity of the second hole segment 420. It is understood that the aperture, spacing, and length of the channels 431 are the main parameters affecting the sound absorption effect, and this application embodiment does not limit these parameters. The evenly distributed and elongated channels 431 can eliminate vortices and redistribute fluid velocity, thereby achieving a rectification effect.

[0060] Based on the above embodiments, in one possible implementation, the sound-absorbing part 430 may be sintered from a silicate mineral; however, this application does not impose limitations on this embodiment. It is understood that, as Figure 4 As shown, due to the material properties of the sintered sound-absorbing part 430, the surface of the channel 431 can form several uniform and fine small holes 432, which have the effect of increasing damping. In this way, when the fluid flows through the small holes 432, the frictional force generated by the damping, due to the viscosity of the pipe wall on the fluid, can convert the vibrational mechanical energy noise in the fluid into heat energy and dissipate it, thereby eliminating the noise in the fluid.

[0061] Based on the above embodiments, in one possible implementation, combined with Figure 2 as well as Figure 4As shown, the small holes 432 on the surface of the channel 431 can be circular, and this embodiment of the application is not limited thereto. In another possible embodiment, the small holes 432 on the surface of the channel 431 can also be regular hexagonal holes. In this way, according to the principle of topology, the contact surface area between the fluid and the pipe wall can be increased without changing the volume of the channel 431, which can further consume energy and thus eliminate noise.

[0062] Continue to refer to Figure 2 Based on the above embodiments, the cross-sectional area of ​​the second end 212 of the conical flow channel 210 can be greater than or equal to the cross-sectional area of ​​the first end 211 of the conical flow channel 210, thereby making the conical flow channel 210 inclined and forming a conical flow channel structure. In the embodiments of this application, the inclination angle of the conical flow channel 210 can be less than or equal to the inclination angle of the tip 411 of the guide shroud 410, thereby making the flow cross-sectional area from the first diameter expansion section 213 to the diameter contraction section 214 gradually decrease, which facilitates the collision between fluids.

[0063] In one possible implementation, the flow guide 400 can be a one-piece structure. For example, Figure 2 As shown, the housing 200 may further include a first housing 230 and a second housing 240. In this embodiment, the first housing 230 may include a tapered flow channel 210, while the second housing 240 may include a second expansion section 220. In one possible implementation, the second housing 240 may have a stepped portion 241, which may be located at one end of the second expansion section 220 facing away from the first expansion section 213. In this embodiment, the end of the sound-absorbing portion 430 facing the second hole section 420 may be inserted into the second hole section, such that at least a portion of the sidewall of the second hole section 420 covers the sound-absorbing portion 430, thereby fixing the second hole section 420 and the sound-absorbing portion 430 together. Thus, through the cooperation of the second hole section 420 and the sound-absorbing portion 430, the flow guide 400 is an integral structure, which facilitates installation. It is understandable that the second hole section 420 can abut against the step section 241, and the side wall of the second hole section 420 can be fixedly connected to the step section 241 by fasteners, thereby improving assembly efficiency.

[0064] Continue to refer to Figure 1 This application provides an ultrasonic flow meter 500 in a second aspect. The ultrasonic flow meter 500 may include a metering structure 600 and the aforementioned rectifying structure 100. In this embodiment, the rectifying structure 100 of the ultrasonic flow meter may be connected to the metering structure 600. The rectifying structure 100 may be located at the air inlet of the ultrasonic flow meter 500, while the metering structure 600 may be located at the air outlet of the ultrasonic flow meter 500, thereby facilitating fluid flow.

[0065] Continue to refer to Figure 1 Based on the above embodiments, the metering structure 600 can be connected to the sound-absorbing part 430 of the rectifying structure 100 of the ultrasonic flowmeter. In this embodiment, one end of the sound-absorbing part 430 of the rectifying structure 100 of the ultrasonic flowmeter can be connected to the second orifice 420 of the rectifying structure 100 of the ultrasonic flowmeter, while the other end of the sound-absorbing part 430 of the rectifying structure 100 of the ultrasonic flowmeter can be connected to the metering structure 600.

[0066] In this embodiment, the rectifying structure 100 of the ultrasonic flowmeter provides a variable-diameter flow channel design, which causes the fluid to refract at the variable-diameter point, thereby eliminating some noise. Combined with the structure of the first orifice plate 300, noise interference is effectively reduced and the signal-to-noise ratio is improved while ensuring a stable flow field, thus improving the adaptability of the ultrasonic flowmeter to various installation scenarios.

[0067] In the embodiments of this application, it can be understood that the rectification structure 100 of the ultrasonic flow meter provided in the embodiments of this application is built into the interior of the ultrasonic flow meter 500, which saves installation space, reduces manufacturing and processing costs, and can effectively eliminate noise and rectify the flow field.

[0068] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0069] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0070] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0071] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0072] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0073] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A rectifying structure for an ultrasonic flow meter, characterized in that, include; A housing, wherein a tapered flow channel is provided inside the housing, and the tapered flow channel has a first end and a second end; A first perforated plate is located on one side of the housing and is disposed near the first end of the tapered flow channel. The first perforated plate has a plurality of through holes, which are connected to the tapered flow channel. The guide section, at least a portion of the guide section and the first end of the tapered flow channel form a first diameter expansion section, at least a portion of the guide section and the second end of the tapered flow channel form a diameter reduction section, and at least a portion of the guide section and at least a portion of the housing form a second diameter expansion section; The cross-sectional area of ​​the fluid flowing through the narrowed section is smaller than the cross-sectional area of ​​the first widened section and the cross-sectional area of ​​the second widened section.

2. The rectifying structure of the ultrasonic flowmeter according to claim 1, characterized in that, The flow guiding section includes a flow guiding hood, a second perforated section, and a sound absorbing section arranged sequentially along the fluid flow direction; The flow guide shroud has a pointed end facing the first perforated plate, one end of the second perforated section is connected to the other end of the flow guide shroud, and the other end of the second perforated section is connected to the sound-absorbing part; The reduced diameter section is formed at the location where the flow guide shroud and the second orifice are connected and at the second end of the tapered flow channel.

3. The rectifying structure of the ultrasonic flowmeter according to claim 2, characterized in that, The cross-sectional area of ​​the end of the flow guide facing the second hole section, the cross-sectional area of ​​the second hole section, and the cross-sectional area of ​​the sound-absorbing part in the radial direction are all the same.

4. The rectifying structure of the ultrasonic flowmeter according to any one of claims 1-3, characterized in that, The through hole includes a first through hole and a second through hole; Several first through holes are located near the center of the first perforated plate and are distributed circumferentially, while several second through holes are distributed circumferentially along the edge of the first perforated plate. The diameter of the first through holes is greater than or equal to the diameter of the second through holes.

5. The rectifying structure of the ultrasonic flowmeter according to claim 4, characterized in that, The through hole also includes a third through hole, the diameter of which is less than or equal to the diameter of the second through hole; Several third through holes are located in the gap between the circumferentially distributed second through holes and the first through holes, so that the third through holes are circumferentially distributed.

6. The rectifying structure of the ultrasonic flowmeter according to claim 2, characterized in that, The second hole section has several fourth through holes on its side wall, and each of the fourth through holes is connected to the internal cavity of the second hole section. The fluid flows sequentially along the narrowed section and the second widened section and enters the internal cavity of the second bore section through the fourth through hole; The sound-absorbing part is provided with a plurality of channels, which are evenly distributed along the circumferential direction of the sound-absorbing part, and each channel is connected to the internal cavity of the second hole segment.

7. The rectifying structure of the ultrasonic flowmeter according to claim 2, characterized in that, The cross-sectional area of ​​the second end of the conical flow channel is greater than or equal to the cross-sectional area of ​​the first end of the conical flow channel, so that the conical flow channel is set at an inclination. The tilt angle of the conical flow channel is less than or equal to the tilt angle of the tip of the flow guide.

8. The rectifying structure of the ultrasonic flowmeter according to claim 2, characterized in that, The housing includes a first housing and a second housing, the first housing includes the tapered flow channel, and the second housing includes the second expanded diameter section; The second housing has a stepped portion located at one end of the second enlarged diameter section opposite to the first enlarged diameter section. The second hole section and the stepped portion abut against each other, and the sidewall of the second hole section is fixedly connected to the stepped portion.

9. An ultrasonic flow meter, characterized in that, include: Measurement structure; And the rectification structure of the ultrasonic flow meter according to any one of claims 1-8, wherein the rectification structure of the ultrasonic flow meter is connected to the metering structure.

10. The ultrasonic flow meter according to claim 9, characterized in that, The metering structure and the sound-absorbing part of the rectifying structure of the ultrasonic flow meter are connected.

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