Meter body gas rectification structure and flowmeter

Abstract

The invention discloses a meter body gas rectification structure which comprises a rectification cover and a measuring flow channel, and the rectification cover is arranged on the periphery of the end portion of the measuring flow channel in a covering mode. The third rectifying unit is detachably connected to the side, close to the fairing, of the measuring flow channel, the first rectifying unit is provided with a first outer cylinder matched with a flow meter in shape and a plurality of groups of rectifying guide plates distributed on the inner circumference of the first outer cylinder, and each group of rectifying guide plates are obliquely arranged; and the projection surfaces of the two adjacent groups of rectification guide plates are partially overlapped. According to the invention, the fairing is arranged in front of the measuring flow channel in the meter body, the medium flowing in from the front part is blocked, the flowing path of the medium is changed, the medium can be dispersed at the periphery of the measuring flow channel along the periphery of the fairing, the medium cannot directly enter an inlet of the measuring flow channel, and the medium is rewound to the inner side of the fairing in the meter body, so that the measurement accuracy is improved. And the gas flows along a gap / cavity formed between the fairing and the measuring flow channel and then enters the measuring flow channel through the third rectifying unit.

Description

Technical Field

[0001] This invention belongs to the technical field of gas metering devices, specifically relating to a gas rectification structure for a meter body and a flow meter. Background Technology

[0002] The ultrasonic flow meter is a precision multi-channel ultrasonic gas flow meter, designed specifically for measurement applications requiring high accuracy and reliability. It is primarily used for natural gas trade metering, serving city gas and industrial / commercial users. It features a top-mounted corrector with integrated temperature and pressure correction functions, converting the measured operating volumetric flow rate into a standard volumetric flow rate. Figure 1 As shown.

[0003] Most ultrasonic gas flow meters on the market are propagation time ultrasonic flow meters. When ultrasonic waves propagate in a flowing medium, their velocity relative to a fixed coordinate system differs from their velocity in a stationary medium, and this change is related to the medium's flow velocity. Therefore, the medium's flow velocity can be calculated from the change in ultrasonic velocity, and propagation time ultrasonic flow meters are designed based on this principle.

[0004] Because flow meters based on ultrasonic principles require a uniform and stable gas flow medium when in operation, in actual use, factors such as pipe bends and valves in the metering pipeline can adversely affect the state and distribution of the gas medium inflow, causing the fluid medium to flow turbulently and irregularly in the pipeline and metering channel, thus affecting the accuracy of gas medium measurement.

[0005] While conducting early research on the problem of turbulence of media in pipelines and metering channels, the applicant disclosed a gas rectifier and flow meter in Chinese patent application number CN202422836412.0. After rectification by the rectifier, the detection effect of the ultrasonic flow meter on the fluid can be effectively improved.

[0006] However, in most cases, due to limited space, it is often impossible to guarantee a straight pipe of sufficient length to connect with the flow meter. Simply increasing the number of existing rectifiers and repeatedly dispersing the gas medium can mitigate the measurement impact of short pipe installation conditions to some extent, but the flow path of the gas medium is still straight, the medium flow velocity is relatively fast, and it flows straight in and out of the meter body. The accuracy of the data measured by the flow meter still needs to be further improved. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A gas rectification structure for a surface, comprising: Fairing; The third rectifier unit is detachably connected to the side of the measuring channel near the rectifier shroud. The fairing is installed on the outer periphery of the end of the measuring channel, and a gap is left between the inner wall of the fairing and the measuring channel and the outer wall of the third rectification unit for the medium to flow through. It also includes a first rectifier unit located outside the fairing and a second rectifier unit that works in conjunction with the measuring channel on the side away from the third rectifier unit; The measurement channel includes: Flow channel body; The mounting base is detachably connected to the outside of the flow channel body, and the mounting base has mounting holes for assembling ultrasonic transducers. The mounting bases are arranged in pairs and are symmetrically distributed with respect to the axis of the flow channel body, and the axes of the mounting bases are located on the same straight line.

[0008] Furthermore, the mounting base is configured in two pairs, with the axes of the two pairs of mounting bases arranged in a cross pattern.

[0009] Furthermore, the angle formed by the line connecting the axes of the mounting bases on both sides and the centerline of the flow channel body is an acute angle.

[0010] Furthermore, the flow channel body has a flow collecting bucket with a gradually narrowing opening on the side near the second rectifier unit.

[0011] This application also discloses a rectangular flow channel structure, including the above-mentioned rectifier assembly. The flow channel body of the rectifier assembly has a rectangular cross-section, and the side of the flow channel body is provided with a threaded hole that mates with the mounting base.

[0012] Furthermore, the mounting hole of the mounting base is a stepped hole.

[0013] Compared with the prior art, the present invention has the following beneficial effects: A rectifier is installed in front of the measuring channel inside the meter body to block the medium flowing in from the front, changing the flow path of the medium. The medium can be dispersed along the outer periphery of the measuring channel along the outer periphery of the rectifier. The medium will not directly enter the inlet of the measuring channel. The medium will wrap around to the inner side of the rectifier in the meter body and enter the measuring channel through the gap / cavity formed between the rectifier and the measuring channel through the third rectification unit.

[0014] This rectifier assembly acts as a buffer to block and slow down the flow of the gas medium, making full use of the internal space of the meter body and increasing the flow distance of the medium. It is suitable for harsh short-pipe installation environments. The measuring channel adopts a relatively separable and combinable channel body and mounting base. The number of ultrasonic transducers can be increased or decreased according to the actual measurement needs to meet the installation of a predetermined number of ultrasonic transducers. This method eliminates the need for multiple batches and models of meter body production. One meter body can meet the installation needs of multiple ultrasonic transducer quantities, reducing production and installation costs. Attached Figure Description

[0015] Figure 1 A three-dimensional structural diagram of the flow meter in a specific embodiment of the present invention is provided. Figure 2 A cross-sectional view of the flow meter is provided to illustrate a specific embodiment of the present invention. Figure 3 This is a schematic diagram illustrating the main structural features of the table body in an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA; Figure 5 This is a schematic diagram illustrating the exploded structure of the flow meter in this embodiment of the invention; Figure 6 This is a schematic diagram illustrating the main structure of the fairing and measuring channel in an embodiment of the present invention; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of BB; Figure 8 This is a top view diagram illustrating the measurement channel structure in an embodiment of the present invention; Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure of the C-C section; Figure 10 This is a schematic diagram illustrating the three-dimensional structure of the measuring channel in an embodiment of the present invention; Figure 11 This is a schematic diagram illustrating the three-dimensional structure of the entire cover in an embodiment of the present invention; Figure 12 This is a schematic diagram illustrating the three-dimensional structure of the first rectifier unit in an embodiment of the present invention; Figure 13 This is a cross-sectional view of the first rectifier unit. Figure 14 This is a three-dimensional structural diagram illustrating the second rectifier unit in an embodiment of the present invention; Figure 15 This is a cross-sectional view of the entire rectifier structure and a schematic diagram of the medium flow direction; The reference numerals in the accompanying drawings include: First rectifier unit 1, first outer cylinder 10, rectifier guide plate 11, rectifier cavity 12, second rectifier unit 2, second outer cylinder 20, protruding rib 22, mounting ring 23, fastening through hole 24, third rectifier unit 3, meter body 4, mounting groove 40, connecting seat ear 400, measuring flow channel 41, flow channel body 410, mounting seat 411, mounting hole 412, flow collecting hopper 413, ultrasonic encapsulation component 42, rectifier cover 43, outer connector 44, inner connector 45, connecting end 46, baffle plate 47, corrector 5. Detailed Implementation

[0016] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0017] like Figure 1 - Figure 15 As shown, a gas rectification structure for a surface of the present invention includes a first rectification unit 1, a second rectification unit 2, a third rectification unit 3, and a rectification shroud. The first rectifier unit 1 and the second rectifier unit 2 are respectively located on both sides of the flow meter and are detachably connected to the flow meter body. Several sets of non-connected diversion channels are evenly distributed in the first rectifier unit 1, the second rectifier unit 2, and the third rectifier unit 3, extending along the length direction. External gas medium can enter the flow meter through the first rectifier unit 1, and under the action of the diversion channel, it enters the measuring channel 41 evenly from the third rectifier unit 3, and finally disperses out from the other end of the second rectifier unit 2.

[0018] By installing this rectifier assembly on both sides of the connection between the flow meter and the pipeline, the gas flow medium entering the flow meter is ensured to be in a uniform and stable state, avoiding turbulence of the medium in the metering channel and affecting the measurement accuracy.

[0019] Each component flow channel has a polygonal cross-section, and multiple flow channels are combined to form a honeycomb structure. This configuration, along with the combined action of the components in the rectifier assembly, ensures that the gas medium entering the flow meter is rectified, transforming asymmetrical flow and axial vortices into a uniform turbulent state. This effectively improves the ultrasonic flow meter's detection performance.

[0020] In this embodiment, in addition to the meter body 4, a corrector 5 is installed on the upper part of the gas flow meter. The meter body 4 has a mounting groove 40 on its side, and the first rectifier unit 1 and the second rectifier unit 2 are installed in the mounting groove 40, forming an integral part with the meter body 4.

[0021] A measuring channel 41 is provided in the body 4, and at least one pair of ultrasonic encapsulation components 42 are installed in the measuring channel 41. In this embodiment, two pairs of ultrasonic encapsulation components 42 are installed to measure / meter the gas medium flowing through the measuring channel 41.

[0022] In addition, to further improve the measurement accuracy of this flow meter, a third rectifier unit 3 is added, which is located on the side of the measuring channel 41 close to the first rectifier unit 1.

[0023] Specifically, the rectifier 43 is installed in the meter body 4 between the measuring channel 41 and the first rectifier unit 1.

[0024] The shroud 43 shields the third rectification unit 3, and a gap is left between the inner wall of the shroud 43 and the measuring channel 41 for the medium to flow through.

[0025] After the medium passes through the meter body 4, a rectifier 43 is placed in front of the measuring channel 41 inside the meter body 4 to block the medium flowing in from the front, changing the flow path of the medium. The medium can be dispersed along the outer periphery of the rectifier 43 and around the outer periphery of the measuring channel 41. The medium will not directly enter the inlet of the measuring channel 41. The medium will wrap around the inner side of the rectifier 43 in the meter body 4 and enter the measuring channel 41 through the gap / cavity formed between the rectifier 43 and the measuring channel 41 via the third rectification unit 3. The above structure serves two purposes: firstly, it acts as a buffer to block and slow down the flow of the gas medium; secondly, due to the special shape of the rectifier 43, the medium is dispersed inside the meter body 4 and forms a backflow pattern on both sides of the measuring channel 41, making full use of the internal space of the meter body 4 and increasing the flow distance of the medium. This makes it suitable for more demanding short-pipe installation environments and ensures accurate measurement of the flow meter in such environments. In conjunction with the third rectifier unit 3, it ensures that the gas flow medium entering the measuring channel 41 is in a uniform and stable state, avoiding turbulence of the medium in the metering channel and affecting the measurement accuracy.

[0026] This setup, in installation environments with short pipe connections, can buffer the airflow of the medium, increase the flow distance of the medium, and allow it to be rectified by different flow structures, ultimately making the medium airflow more stable and facilitating accurate measurement of the gas medium.

[0027] like Figure 4 , Figure 15 The diagram illustrates the flow path of the gas medium in this embodiment.

[0028] Through the description of the function of the first rectification unit 1, it can be understood as a vortex generator, whose function is to break up the asymmetric flow in the pipeline. For example, after the air flow in a pre-pipeline is affected by filters, pressure regulators, etc., the air flow in the pipeline may show a situation where the upper part is fast and the lower part is slow. If the air flow in this situation is not processed and directly enters the meter body for measurement, the measured data will be inaccurate and there will be a large deviation.

[0029] Therefore, it is necessary to break up the pre-air flow in the above situation. This vortex generator, that is, the first rectification component 1, can quickly break up and mix evenly the air flow processed by the first rectification unit 1, so as to form a symmetric flow state conducive to measurement.

[0030] However, after the action of the vortex generator, that is, the first rectification unit 1, although a symmetric flow can be formed, axial vortices will also be generated. After the action of adding a baffle, that is, the fairing 43, it flows around the fairing 43 and buffers in the cavity between the fairing 43 and the meter body to eliminate the axial vortices, and finally enters the measurement flow channel again. At this time, the air flow in the lower state is in a turbulent state (high speed), and the gas medium is in a symmetric, uniform, and stable state, meeting the measurement specification requirements of the sensor.

[0031] That is, the working condition of this flowmeter is carried out under the turbulent state of the air flow.

[0032] Specifically, the fairing 43 is bowl-shaped and evenly disperses the medium on the outer periphery of the measurement flow channel 41.

[0033] Such as Figure 4 、 Figure 11 As shown, where outer connectors 44 and inner connectors 45 are provided on the outer and inner sides of the fairing 43. The fairing 43 is fixed to the meter body 4 and the third rectification unit 3 through the outer connectors 44 and inner connectors 45.

[0034] Specifically, connection ends 46 are provided at the end connection ends 46 of the outer connectors 44 and inner connectors 45. The connection ends 46 are used to cooperate with the connection seat ears 400 on the inner side of the meter body 4 and are fixed with bolts. The third rectification unit has fastening through holes that cooperate with the fairing 43 and the outer connectors 44.

[0035] In addition, the outer connectors 44 and inner connectors 45 are symmetrically arranged in two groups respectively, and the measurement flow channel 41 is located between the two inner connectors 45. Such a connection form is more firm.

[0036] The outer connector is in a U-shaped.

[0037] Such as Figure 4As shown, in order to further increase the buffering and blocking effect of the shroud 43 on the gas medium, multiple sets of baffles 47 are provided on the inner wall of the shroud 43. The baffles 47 extend radially inward and are arranged at intervals along the opening direction of the shroud 43.

[0038] During the process of the medium flowing back along the inner wall of the rectifier 43, multiple sets of baffles 47 are provided to further buffer and block part of the medium.

[0039] The baffle 47 can also be tilted in the opposite direction to the return path to increase the blocking effect. In addition, the length and width of each baffle 47 can be the same or different, and there are no specific restrictions.

[0040] like Figure 8 , Figure 9 , Figure 10 As shown, specifically, the measuring channel 41 includes a channel body 410 and at least a pair of mounting bases 411; The mounting base 411 is detachably connected to the outside of the flow channel body 410, and the mounting base 411 is provided with mounting holes 412 / stepped holes for assembling ultrasonic transducers. The mounting bases 411 are arranged in pairs and are symmetrically distributed with respect to the axis of the flow channel body 410, and the axes of the mounting bases 411 are located on the same straight line.

[0041] In this embodiment, the mounting bases 411 are configured in two pairs, with their axes intersecting. The angle formed by the line connecting the axes of the two mounting bases 411 and the center line of the flow channel body 410 is an acute angle. The flow channel body 410 has a rectangular cross-section, and the side of the flow channel body 410 has a threaded hole that mates with the mounting base 411.

[0042] The rectangular flow channel body 410 design, unlike smooth-surface flow channel bodies 410 such as cylindrical, circular or spherical structures, provides a better blocking effect when the gaseous medium flows inside the surface body 4 and interacts with the outer surface of the flow channel body 410, which is conducive to the smooth flow of the medium.

[0043] like Figure 9 As shown, the flow channel body 410 has a flow collecting bucket 413 with a gradually narrowing opening on the side near the second rectifier unit 2.

[0044] The function of the collecting hopper 413 is to slowly guide the gas medium after rectangular rectification to the surrounding area, and then discharge it from the meter body 4 through the second rectification unit 2. At the same time, the measuring channel 41 is also connected to the inner wall of the meter body through the collecting hopper 413.

[0045] The measuring channel 41 uses a channel body 410 and a mounting base 411 that can be separated and combined. The number of ultrasonic transducers can be increased or decreased according to the actual measurement needs, so as to meet the installation of a predetermined number of ultrasonic transducers. This method eliminates the need for multiple batches and models of the meter body 4. One meter body 4 can meet the installation needs of multiple quantities of ultrasonic transducers, reducing production and installation costs.

[0046] Specifically, such as Figures 12 to 15 As shown, the first rectifier unit 1 has a first outer cylinder 10 conforming to the flow meter and several sets of rectifier guide plates 11 distributed on the inner periphery of the first outer cylinder 10. Each set of rectifier guide plates 11 is inclined, the projection surfaces of two adjacent sets of rectifier guide plates 11 partially overlap, and a rectifier cavity 12 is formed between two adjacent sets of rectifier guide plates 11 to guide the medium radially and axially along the first outer cylinder 10. The second rectifier unit 2 includes a second outer cylinder 20 and several sets of non-communicating diversion channels that extend along the length direction and are evenly distributed inside the second outer cylinder 20. External gas medium can enter the flow meter from one end of the first rectifier unit 1 through the rectifier cavity 12, and under the action of the diversion channel, it is evenly dispersed from the other end of the second rectifier unit 2.

[0047] Since the first rectifier unit 1 adopts multiple sets of inclined rectifier guide plates 11, the projection surfaces of two adjacent sets of rectifier guide plates 11 partially overlap. Under the action of the first rectifier assembly 1, the gaseous medium is introduced into the rectifier cavity 12 radially and axially along the first outer cylinder 10 and enters the meter body 4, which further stabilizes the flow state of the medium to be measured. It is suitable for more demanding short pipe installation environments and provides a guarantee for the accurate measurement of the flow meter in such installation environments.

[0048] like Figure 14 As shown, the second outer cylinder 20 has a raised rib 22 or a groove on its peripheral wall that can cooperate with the flow meter.

[0049] Specifically, a protruding rib 22 can be provided on the second outer cylinder 20, and a groove can be installed in the dial body 4. Alternatively, the positions of the protruding rib 22 and the groove can be interchanged. The function of the protruding rib 22 and the groove is to allow the second rectifier unit 2 to be pre-positioned during installation. Only after the protruding rib 22 and the groove are aligned can the second rectifier unit 2 be inserted into the dial body 4, preventing the second rectifier unit 2 from shaking or rotating during assembly and causing misalignment of the fastening through hole 24 / threaded hole used for fixing.

[0050] Specifically, the protruding ridges 22 or grooves are symmetrically arranged in two sets and extend along the axial direction.

[0051] Each component flow channel has a polygonal cross-section, and the multiple flow channels are combined to form a honeycomb structure. This arrangement, along with the combined action of the first rectification unit 1 and the second rectification unit 2, effectively improves the ultrasonic flow meter's detection performance of the fluid after the gas medium entering the flow meter is rectified.

[0052] In addition, a mounting ring 23 can be provided at the end of the second outer cylinder 20, and a fastening through hole 24 is provided on the mounting ring 23. The second rectifier unit 2 is fixed by the cooperation of bolts with the fastening through hole 24.

[0053] Furthermore, the rectangular cross-section of the flow channel body 410 in this measuring channel 41, compared to other cross-sectional shapes such as circles, allows for a faster medium flow velocity and a closer approximation to turbulence under the same flow rate, which is beneficial for measurement. Simultaneously, the rectangular structure, compared to a circular cross-section, allows for optimized design of the ultrasonic sensor installation position within the same installation space, increasing the measured sound path (the distance sound waves travel) and further enhancing measurement accuracy.

[0054] It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A gas rectification structure for a surface, characterized in that, include: Fairing (43); The measuring channel (41) is covered by the shroud (43) on the outer periphery of the end of the measuring channel (41); The third rectifier unit (3) is detachably connected to the side of the measuring channel (41) near the rectifier shroud (43). A gap is left between the inner wall of the rectifier (43) and the measuring channel (41) and the outer wall of the third rectifier unit (3) for the medium to flow through; It also includes a first rectifier unit (1) located outside the fairing (43) and a second rectifier unit (2) located on the side of the measuring channel (41) away from the third rectifier unit (3); The measuring channel (41) includes a channel body (410) with a rectangular cross-section and a mounting base (411). The mounting base (411) is detachably connected to the outside of the channel body (410), and the mounting base (411) has a mounting hole (412) for assembling an ultrasonic transducer. The first rectifier unit (1) has a first outer cylinder (10) conforming to the flow meter and a plurality of sets of rectifier guide plates (11) distributed on the inner periphery of the first outer cylinder (10). Each set of rectifier guide plates (11) is inclined. The projection surfaces of two adjacent sets of rectifier guide plates (11) partially overlap, and a rectifier cavity (12) is formed between two adjacent sets of rectifier guide plates (11) to guide the medium radially and axially along the first outer cylinder (10).

2. The gas rectification structure of the surface body as described in claim 1, characterized in that: The mounting base (411) is configured in two pairs, and the axes of the two pairs of mounting bases (411) are arranged in a cross pattern.

3. A gas rectification structure for a surface as described in claim 1 or 2, characterized in that: The angle formed by the line connecting the axes of the mounting bases (411) on both sides and the center line of the flow channel body (410) is an acute angle.

4. The gas rectification structure of the surface body as described in claim 1, characterized in that: The mounting bases (411) are arranged in pairs and are symmetrically distributed with respect to the axis of the flow channel body (410), and the axes of the mounting bases (411) are located on the same straight line.

5. The gas rectification structure of the surface as described in claim 1, characterized in that: The second rectifier unit (2) includes a second outer cylinder (20) and several sets of diversion channels that extend along the length direction and are not interconnected, evenly distributed inside the second outer cylinder (20).

6. A flow meter, characterized in that: It includes the rectifier structure, the dial body (4), and the corrector (5) rotatably connected to the dial body (4) as described in any one of claims 1 to 5.

7. The gas rectification structure of the surface as described in claim 6, characterized in that: The measuring channel (41) is equipped with at least one pair of ultrasonic encapsulation components (42).

8. The gas rectification structure of the surface as described in claim 6, characterized in that: The second outer cylinder (20) has a raised ridge (22) or groove on its peripheral wall that can cooperate with the surface body (4).

9. The gas rectification structure of the surface body as described in claim 8, characterized in that: Mounting ring (23) at the end of the second outer cylinder (20).

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