Rectifier of ultrasonic flowmeter

Abstract

The utility model provides a rectifier of an ultrasonic flowmeter, and particularly relates to the technical field of gas flow. The rectifier of the ultrasonic flow meter comprises a first rectifying element. Wherein the first rectifying element comprises a perforated plate, an air chamber is arranged on one side of the perforated plate, a plurality of through holes are formed in the perforated plate, and the through holes are communicated with the air chamber. A gap is formed between the peripheral edge of the porous plate and the inner side wall of the gas chamber; gas penetrates through the gap and the through holes and enters the gas chamber. Therefore, the first rectifying element adopted by the rectifier of the ultrasonic flowmeter comprises the perforated plate structure, the perforated plate is combined with the gas chamber, gas penetrates through the gap between the perforated plate and the gas chamber and the through holes in the perforated plate to enter the gas chamber, secondary flow energy is dissipated, a wall surface laminar flow boundary layer is reduced, and the flow rate of the flow is increased. And vortex falling caused by low-speed gas flow separation is prevented.

Description

Technical Field

[0001] This application relates to the field of gas flow technology, and more particularly to a rectifier for an ultrasonic flow meter. Background Technology

[0002] An ultrasonic flow meter is an instrument used 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] To improve the measurement accuracy and reliability of ultrasonic flow meters, they are often combined with rectifiers. Rectifiers are commonly used to improve fluid flow conditions, eliminate or reduce vortices and turbulence in the fluid, and help form a stable flow state. This is crucial for improving the propagation stability and measurement accuracy of ultrasonic signals.

[0004] However, existing rectifier structures used in ultrasonic flow meters typically include a perforated plate and an air chamber. The air chamber is fitted onto the perforated plate without any gap between the walls of the plate and the chamber during installation. This can easily interfere with the propagation of ultrasonic waves between the perforated plate and the air chamber, potentially increasing measurement errors and affecting the accuracy and clarity of the ultrasonic signal. Utility Model Content

[0005] This application provides a rectifier for an ultrasonic flow meter. The first rectifier element includes a perforated plate structure, which combines the perforated plate with a gas chamber. Gas passes through the gap between the perforated plate and the gas chamber, as well as through the through holes on the perforated plate, to enter the gas chamber, dissipating secondary flow energy, reducing the laminar boundary layer on the wall, and preventing low-speed gas flow separation to form vortices and fall off.

[0006] This application provides a rectifier for an ultrasonic flow meter, including a first rectifier element;

[0007] The first rectifier element includes a perforated plate, with an air chamber on one side of the perforated plate, and several through holes are formed on the perforated plate, which are connected to the air chamber.

[0008] There is a gap between the outer peripheral edge of the perforated plate and the inner wall of the gas chamber, through which gas passes into the gas chamber.

[0009] The ultrasonic flowmeter rectifier provided in the first aspect of this application includes a first rectifier element. The first rectifier element includes a perforated plate with an air chamber on one side. The perforated plate has several through holes connected to the air chamber. A gap exists between the outer peripheral edge of the perforated plate and the inner wall of the air chamber, allowing gas to pass through the gap and through the through holes into the air chamber. Thus, the first rectifier element in the ultrasonic flowmeter rectifier provided in this application includes a perforated plate structure, combining the perforated plate with the air chamber. Gas passes through the gap between the perforated plate and the air chamber, as well as the through holes on the perforated plate, into the air chamber, dissipating secondary flow energy, reducing the laminar boundary layer on the wall, and preventing low-speed gas flow separation and vortex shedding.

[0010] In one possible implementation, the outer peripheral edge of the perforated plate is provided with a plurality of protrusions, and the air chamber is provided with an extension in the circumferential direction facing one end of the perforated plate. The protrusions and the extension cooperate to fix the perforated plate and the air chamber together.

[0011] In one possible implementation, it further includes: a second rectifier element;

[0012] The second rectifier element includes a gas chamber and a honeycomb panel, with the honeycomb panel located in the gas chamber.

[0013] In one possible implementation, it further includes: a third rectifier element, wherein the first rectifier element, the second rectifier element and the third rectifier element are arranged sequentially along the gas flow direction;

[0014] The third rectifier element includes a flow guide, and the flow guide has a partition inside, which divides the flow guide into a first channel and a second channel.

[0015] In one possible implementation, the first channel has a plurality of first blades, one end of each first blade being connected to the center of the guide member and the other end being connected to the inner surface of the separator.

[0016] The end of the first blade facing the center of the flow guide is higher than the end of the first blade facing the separator, so that the first blade has an inclined angle.

[0017] In one possible implementation, the second channel has a plurality of second blades and third blades, which are spaced apart.

[0018] The flow guide has a first sidewall and a second sidewall that are arranged opposite to each other. One end of the second blade and the third blade are both connected to the outer surface of the separator. The other end of the second blade is connected to the first sidewall, and the other end of the third blade is connected to the second sidewall.

[0019] In one possible implementation, the air chamber has a receiving cavity for placing a honeycomb panel, and the receiving cavity is connected to a first channel and a second channel.

[0020] In one possible implementation, several through holes are evenly distributed around the center of the perforated plate. The diameter of each through hole is set as d1, which ranges from 3 to 4 mm. The distance between two adjacent through holes ranges from 1.5d1 to 2d1.

[0021] In one possible implementation, the thickness of the perforated plate is set to d2, which ranges from 0.5 to 2 mm.

[0022] In one possible implementation, the diameter of the honeycomb panel is set to d3, the thickness of the honeycomb panel is in the range of 0.4d3-0.5d3, and the distance between the perforated plate and the honeycomb panel in the gas flow direction is 0.3d3-0.5d3.

[0023] In addition to the technical problems solved by this application, the technical features constituting the technical solution, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the rectifier of the ultrasonic flow meter provided by this application, other technical features contained in the technical solution, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0024] 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.

[0025] Figure 1 A cross-sectional schematic diagram of the rectifier of the ultrasonic flow meter provided in the embodiments of this application;

[0026] Figure 2 A side view of the rectifier of an ultrasonic flow meter provided in an embodiment of this application;

[0027] Figure 3 A schematic diagram of the flow guide component in the rectifier of the ultrasonic flow meter provided in this application embodiment;

[0028] Figure 4 for Figure 3 Schematic diagram of the cross section of AA;

[0029] Figure 5A schematic diagram of the perforated plate in the rectifier of the ultrasonic flow meter provided in this application embodiment;

[0030] Figure 6 A schematic diagram of the honeycomb plate structure in the rectifier of the ultrasonic flow meter provided in this application embodiment;

[0031] Figure 7 A side view of the honeycomb plate in the rectifier of the ultrasonic flow meter provided in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100-Rectifier for ultrasonic flow meter;

[0034] 200 - First rectifier element; 210 - Perforated plate; 211 - Through hole; 212 - Protrusion; 220 - Gap;

[0035] 300 - Second rectifier element; 310 - Air chamber; 311 - Extension; 312 - Receiving cavity; 320 - Honeycomb panel;

[0036] 400 - Third rectifier element; 410 - Guide element; 411 - First sidewall; 412 - Second sidewall; 420 - Separator; 430 - First channel; 431 - First blade; 440 - Second channel; 441 - Second blade; 442 - Third blade. Detailed Implementation

[0037] 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.

[0038] As described in the background section, the rectifier structure of existing ultrasonic flow meters typically includes a perforated plate and an air chamber. The air chamber is fitted onto the perforated plate without any gap between the walls of the plate and the chamber during installation. This can easily lead to interference with the propagation of ultrasonic waves between the perforated plate and the air chamber, potentially increasing measurement errors and affecting the accuracy and clarity of the ultrasonic signal.

[0039] Furthermore, ultrasonic flow meters are susceptible to the influence of various flow disturbance elements such as bends and diameter changes upstream. Additionally, due to limitations in the installation environment, it is difficult to equip the upstream and downstream of the ultrasonic flow meter with straight pipe sections of sufficient length to meet metering requirements. This can easily lead to uneven gas velocity distribution within the ultrasonic flow meter, affecting the stability of the ultrasonic detection data and increasing the flow error, thus failing to meet metering accuracy standards.

[0040] In related technologies, rectifiers typically include structures such as spiral airflow separators, orifice plate rectifiers, and stainless steel rectifiers. These rectifiers can rectify and arrange non-uniform gas velocity distributions to varying degrees. However, a single rectifier structure is difficult to dissipate turbulent kinetic energy quickly, and it is difficult to effectively eliminate disturbances from pulsating and secondary flows. Furthermore, the rectifier requires sufficient space at its end for self-rectification.

[0041] To address the aforementioned technical problems, this application provides a rectifier for an ultrasonic flow meter. The rectifier includes a first rectifier element. This first rectifier element comprises a perforated plate with an air chamber on one side. Several through holes are formed on the perforated plate, communicating with the air chamber. A gap exists between the outer periphery of the perforated plate and the inner wall of the air chamber, allowing gas to pass through the gap and through the through holes into the air chamber. Thus, the first rectifier element in the ultrasonic flow meter provided by this application, comprising a perforated plate structure, combines the perforated plate with the air chamber. Gas passes through the gap between the perforated plate and the air chamber, as well as the through holes on the perforated plate, into the air chamber, dissipating secondary flow energy, reducing the laminar boundary layer on the wall, and preventing low-speed gas flow separation and vortex shedding.

[0042] 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.

[0043] This application provides a rectifier for an ultrasonic flow meter. The first rectifier element includes a perforated plate structure, combining the perforated plate with a gas chamber. Gas passes through the gap between the perforated plate and the gas chamber, as well as through the through holes in the perforated plate, to enter the gas chamber, dissipating secondary flow energy, reducing the laminar boundary layer on the wall, and preventing low-speed gas flow separation to form vortices and fall off. The specific structure of the rectifier for an ultrasonic flow meter provided in this application embodiment will be described below with reference to the accompanying drawings.

[0044] refer to Figure 1 This application provides a rectifier 100 for an ultrasonic flow meter in a first aspect. The rectifier 100 may include a first rectifier element 200, a second rectifier element 300, and a third rectifier element 400. In this application embodiment, the first rectifier element 200, the second rectifier element 300, and the third rectifier element 400 may be arranged sequentially along the gas flow direction.

[0045] In one possible implementation, continue to refer to Figure 1 The first rectifier element 200 may further include a perforated plate 210, and an air chamber 310 may be provided on one side of the perforated plate 210. In one possible implementation, the perforated plate 210 may be designed according to the inlet shape of the ultrasonic flow meter. For example, the perforated plate 210 may be a circular structure or a square structure, and this application embodiment is not limited thereto. In the embodiments of this application, such as Figure 2 As shown, a circular structure is used as an example with a perforated plate 210. The perforated plate 210 has through holes 211, and the number of through holes 211 can be several. In this embodiment, the number of through holes 211 is not limited. All through holes 211 can communicate with the air chamber 310.

[0046] Continue to refer to Figure 1 Based on the above embodiments, the second rectifier element 300 may further include an air chamber 310 and a honeycomb panel 320. In one possible implementation, the air chamber 310 may be a cylindrical structure, which is not limited in this embodiment. In this embodiment, a cylindrical structure of the air chamber 310 is used as an example. One end of the air chamber 310 may be connected to the perforated plate 210, while the other end may be connected to the third rectifier element 400. It is understood that the honeycomb panel 320 may also be a circular structure, allowing the honeycomb panel 320 to be located within the air chamber 310.

[0047] Continue to refer to Figure 1 Based on the above embodiments, the third rectifier element 400 may further include a flow guide 410. In one possible implementation, the flow guide 410 may be an annular structure; however, this embodiment does not impose a limitation on this. In this embodiment, the flow guide 410 may have blade structures, and the number of blade structures may be several; this embodiment also does not impose a limitation on the number of blade structures. Several blade structures may be symmetrically arranged in the flow guide 410. Exemplarily, the number of blade structures may be even, thereby allowing the several blade structures to be symmetrically arranged.

[0048] In this embodiment, rectification is achieved by combining a first rectifier element 200, a second rectifier element 300, and a third rectifier element 400, which is beneficial for measuring pulsating and secondary flows. The first rectifier element 200 employs a perforated plate 210 structure, which is simple to manufacture and provides effects such as pulsation reduction, vortex dispersion, and noise reduction. The second rectifier element 300 uses a honeycomb structure to disperse vortices and straighten the fluid. The third rectifier element 400 uses a blade structure to redistribute the straightened fluid velocity, achieving rapid self-rectification. The rectifier has a compact structure, strong applicability, and good noise reduction effect.

[0049] Continue to refer to Figure 2 Based on the above embodiment, a gap 220 may be provided between the outer peripheral edge of the perforated plate 210 and the inner sidewall of the gas chamber 310. This allows gas to pass through the gap 220 between the perforated plate 210 and the gas chamber 310, as well as the through-holes 211 on the perforated plate 210, into the gas chamber 310, dissipating secondary flow energy. Simultaneously, the gas flows along the inner sidewall of the gas chamber 310 into the second rectifier element 300, reducing the laminar boundary layer on the wall and preventing low-speed gas flow separation that could form vortices and detach.

[0050] Continue to refer to Figure 1 as well as Figure 2 Based on the above embodiments, the outer peripheral edge of the perforated plate 210 may be provided with a protrusion 212, and the air chamber 310 may be provided with an extension 311 in the circumferential direction facing one end of the perforated plate 210. In one possible implementation, the number of protrusions 212 can be several; this application embodiment does not limit the number of protrusions 212. In this application embodiment, four protrusions 212 are used as an example. The four protrusions 212 can cooperate with the extension 311, thereby enabling the perforated plate 210 and the air chamber 310 to be fixedly connected by fasteners.

[0051] refer to Figure 3 Based on the above embodiments, the flow guide 410 may be provided with a separator 420. In one possible implementation, the separator 420 may also be an annular structure; this embodiment does not impose such a limitation. In this embodiment, the separator 420 may be located within the flow guide 410 and at a certain distance from the center of the flow guide 410, thereby dividing the flow guide 410 into a first channel 430 and a second channel 440.

[0052] Continue to refer to Figure 3 Based on the above embodiments, the first channel 430 may have a first blade 431. In one possible implementation, the number of first blades 431 can be several; this application embodiment does not limit the number of first blades 431. In this application embodiment, one end of each first blade 431 can be connected to the center of the guide member 410, and the other end of each first blade 431 can be connected to the inner surface of the separator 420, thereby causing several first blades 431 to be evenly distributed circumferentially around the center of the guide member 410. Additionally, in one possible implementation, such as... Figure 4As shown, the end of the first blade 431 facing the center of the guide member 410 can be higher than the end of the first blade 431 facing the separator 420, thus giving the first blade 431 an inclined angle. The complementary angle of this inclined angle can be θ, as shown in the figure. It can be understood that by setting the angle θ, the velocity at low speeds can supplement the first channel 430, and the velocity at high speeds can supplement the second channel 440, thereby adjusting the cross-sectional velocity distribution and achieving rapid self-adjustment.

[0053] Continue to refer to Figure 3 as well as Figure 4 Based on the above embodiments, the second channel 440 may have a second blade 441 and a third blade 442. In one possible implementation, the number of second blades 441 and third blades 442 can be multiple. This application embodiment does not limit the number of second blades 441 and third blades 442. In this application embodiment, multiple second blades 441 and third blades 442 can be arranged sequentially at intervals. In addition, in one possible implementation, the guide member 410 may have a first sidewall 411 and a second sidewall 412, wherein the first sidewall 411 and the second sidewall 412 can be arranged opposite to each other. It is understood that one end of each second blade 441 and third blade 442 can be connected to the outer surface of the separator 420, and the other end of each second blade 441 is connected to the first sidewall 411, and the other end of each third blade 442 is connected to the second sidewall 412. In this way, the second blade 441 and the third blade 442 can be arranged at opposite angles in the second channel 440, thereby refining the second channel 440 and making the gas flow rate more uniform.

[0054] Continue to refer to Figure 1 Based on the above embodiments, the air chamber 310 may have a receiving cavity 312 inside. The receiving cavity 312 is for placing the honeycomb panel 320. It is understood that the receiving cavity 312 can be connected to both the first channel 430 and the second channel 440, thereby facilitating gas flow.

[0055] refer to Figure 5 Based on the above embodiments, a plurality of through holes 211 can be evenly distributed around the center of the porous plate 210. In this embodiment, the diameter of each through hole 211 can be set to d1. In one possible implementation, d1 can range from 3 to 4 mm; exemplarily, the diameter of each through hole 211 can be 3 mm, and this embodiment does not impose any limitation. It is understood that setting a smaller diameter for the through holes 211 can ensure a higher sound absorption coefficient and also avoid the situation where the pore size is too small and easily blocked by dirt.

[0056] Continue to refer to Figure 5Based on the above embodiments, in one possible implementation, the distance between two adjacent through holes 211 ranges from 1.5d1 to 2d1. Exemplarily, the distance between two adjacent through holes 211 can range from 4.5 to 6 mm. This application does not impose limitations on the embodiments described herein. This reduces the likelihood of doping and mixing of gas after passing through the porous plate 210.

[0057] It is understandable that, in one possible implementation, such as Figure 1 As shown, the thickness of the perforated plate 210 can be set to d2, where d2 can range from 0.5 to 2 mm. In this embodiment, for example, the thickness of the perforated plate 210 can be 2 mm. This embodiment does not impose any limitations. Furthermore, the perforation rate of the perforated plate 210 can be set between 35% and 40%, ensuring a good sound absorption coefficient while also considering pressure loss.

[0058] It is understandable that, in one possible implementation, such as Figure 6 as well as Figure 7 As shown, the diameter of the honeycomb panel 320 can be set to d3, and the thickness of the honeycomb panel 320 can range from 0.4d3 to 0.5d3. This ensures a straightening effect. Furthermore, the wall thickness of the individual honeycombs formed on the honeycomb panel 320 can be kept as thin as possible to ensure sufficient flow area and reduce pressure loss.

[0059] Based on the above embodiments, in one possible implementation, such as Figure 1 As shown, the distance between the perforated plate 210 and the honeycomb plate 320 along the gas flow direction can be 0.3d3-0.5d3. In this way, a certain gap 220 is reserved between the perforated plate 210 and the honeycomb plate 320. By utilizing the piston effect of gas flowing through the small holes, fluid pulsation is reduced, achieving a noise reduction effect, thus enabling the rectifier to have a noise reduction function.

[0060] Based on the above embodiments, the perforated plate 210 can be made of stainless steel or aluminum, and can be processed by direct laser cutting, which is simple and has low manufacturing cost. Additionally, the honeycomb plate 320 can also be made of stainless steel; this application does not impose any limitations on its implementation.

[0061] It is understood that in the embodiments of this application, any two rectifier elements among the first rectifier element 200, the second rectifier element 300 and the third rectifier element 400 can be combined to still achieve a good rectification effect. The embodiments of this application will not be described in detail here.

[0062] In this embodiment, the rectifier 100 of the ultrasonic flow meter provided in this application is applicable to ultrasonic gas flow meters of various diameters and has strong versatility. Rectification is achieved by combining a first rectifier element 200, a second rectifier element 300, and a third rectifier element 400. The rectifier has a compact structure, strong applicability, is beneficial for measuring pulsating flow and secondary flow, and also has good noise reduction effect.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, 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 top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0067] 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.

[0068] 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 rectifier for an ultrasonic flow meter, characterized in that, Including the first rectifier element; The first rectifier element includes a perforated plate, a gas chamber is provided on one side of the perforated plate, and a plurality of through holes are formed on the perforated plate, the through holes being connected to the gas chamber; There is a gap between the outer peripheral edge of the perforated plate and the inner sidewall of the air chamber, and gas passes through the gap and the through hole to enter the air chamber.

2. The rectifier of the ultrasonic flow meter according to claim 1, characterized in that, The porous plate has several protrusions on its outer peripheral edge, and the air chamber has an extension in the circumferential direction facing one end of the porous plate. The protrusions and the extension cooperate to fix the porous plate and the air chamber together.

3. The rectifier of the ultrasonic flow meter according to claim 2, characterized in that, Also includes: Second rectifier element; The second rectifier element includes the air chamber and the honeycomb panel, with the honeycomb panel located in the air chamber.

4. The rectifier of the ultrasonic flow meter according to claim 3, characterized in that, Also includes: The third rectifier element, the first rectifier element, the second rectifier element and the third rectifier element are arranged sequentially along the gas flow direction; The third rectifier element includes a flow guide, and the flow guide has a partition inside, which divides the flow guide into a first channel and a second channel.

5. The rectifier of the ultrasonic flow meter according to claim 4, characterized in that, The first channel has a plurality of first blades, one end of each first blade is connected to the center of the guide member, and the other end is connected to the inner surface of the separator. The end of the first blade facing the center of the guide member is higher than the end of the first blade facing the separator, so that the first blade has a tilt angle.

6. The rectifier of the ultrasonic flow meter according to claim 5, characterized in that, The second channel has a plurality of second blades and third blades, the second blades and the third blades being arranged at intervals; The flow guide has a first sidewall and a second sidewall that are arranged opposite to each other. One end of the second blade and the third blade are both connected to the outer surface of the separator. The other end of the second blade is connected to the first sidewall, and the other end of the third blade is connected to the second sidewall.

7. The rectifier of the ultrasonic flow meter according to claim 6, characterized in that, The air chamber has a receiving cavity for placing the honeycomb panel, and the receiving cavity is connected to the first channel and the second channel.

8. The rectifier of the ultrasonic flow meter according to any one of claims 1-7, characterized in that, A plurality of through holes are evenly distributed around the center of the porous plate. The diameter of each through hole is set as d1, the range of d1 is 3-4 mm, and the distance between two adjacent through holes is 1.5d1-2d1.

9. The rectifier of the ultrasonic flow meter according to any one of claims 1-7, characterized in that, The thickness of the perforated plate is set as d2, and the range of d2 is 0.5-2mm.

10. The rectifier of the ultrasonic flow meter according to claim 3, characterized in that, The diameter of the honeycomb plate is set to d3, the thickness of the honeycomb plate is in the range of 0.4d3-0.5d3, and the distance between the porous plate and the honeycomb plate in the gas flow direction is 0.3d3-0.5d3.

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