Differential pressure flow meter and fluid delivery line

Abstract

This disclosure relates to the field of flow metering equipment technology, providing a differential pressure flow meter and a fluid transport pipeline. The differential pressure flow meter includes an inlet body and an outlet body; a sealing unit including a pair of annular grooves and an annular metal gasket disposed between the two; the pair of annular grooves are respectively formed on the wall surfaces of the inlet body and the outlet body; the opposing wall surfaces of the pair of annular grooves are respectively provided with concave-convex sealing structures; wherein, when the inlet body and the outlet body are axially aligned, the annular metal gasket is plastically deformed and adhered to the concave-convex sealing structures on both sides by the relative compression of the concave-convex sealing structures on both sides, thereby forming a line-surface composite sealing structure between the inlet body and the outlet body and the annular metal gasket. This application utilizes the mutual compression of the concave-convex sealing structures on both sides to cause plastic deformation of the annular metal gasket, achieving initial tight adhesion through the high specific pressure of "line contact" and expanding the sealing coverage area through "surface contact", significantly improving sealing reliability.

Description

Technical Field

[0001] This disclosure relates to the field of flow metering equipment technology, and in particular to a differential pressure flow meter and a fluid transport pipeline. Background Technology

[0002] In related technologies, the measurement accuracy of differential pressure flowmeters is mainly limited by two major technical problems: First, the traditional single-point pressure tapping method on the sidewall is prone to inducing high-frequency flow field noise. Single-point drilling cannot effectively filter out vortices and boundary layer separation disturbances generated by flow resistance components, resulting in high-frequency oscillation of static pressure signals and low signal-to-noise ratio, which seriously affects the dynamic stability of the instrument. Second, the sealing structure is not reliable enough under complex working conditions. Traditional polymer seals are prone to aging and swelling, while metal seals are prone to micro-gap due to processing tolerances and thermal deformation, causing fluid "bypass leakage", which leads to attenuation and distortion of differential pressure signals, destroys the linear mapping relationship between differential pressure and flow rate, and ultimately causes the measurement results to deviate significantly from the true value. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this disclosure is to provide a differential pressure flow meter and a fluid delivery pipeline to solve the problems in the related art.

[0004] The first aspect of this disclosure provides a differential pressure flow meter, comprising:

[0005] The main air intake unit has a through-flow channel;

[0006] The air outlet body has a through-type second flow channel, and the second flow channel is fixedly connected to the air inlet body in a way that fits and communicates with the first flow channel; the second flow channel is provided with a first pressure stabilizing cavity for installing a flow resistance element; the air outlet body has two pressure taps that are respectively connected to the second flow channel upstream and downstream of the flow resistance element, and the flow segments of the second flow channel connected by the two pressure taps form a variable diameter;

[0007] The sealing unit includes a pair of annular grooves and an annular metal gasket disposed between them; the pair of annular grooves are respectively formed on the wall surfaces of the air intake body and the air outlet body; the opposing wall surfaces of the pair of annular grooves are respectively provided with concave-convex sealing structures;

[0008] When the air intake body and the air outlet body are axially aligned, the annular metal gasket is squeezed relative to the concave and convex sealing structures on both sides to plastically deform and fit the concave and convex sealing structures on both sides, so as to form a line-surface composite sealing structure between the air intake body and the air outlet body and the annular metal gasket.

[0009] In an embodiment of the first aspect, the cross-sectional shape of the convex-concave sealing structure sequentially includes lines and protruding endpoints; and / or, the hardness of the annular metal gasket is less than the hardness of the convex-concave sealing structure.

[0010] In an embodiment of the first aspect, each of the convex-concave sealing structures includes at least one annular protrusion that protrudes from the wall of the annular groove toward another convex-concave sealing structure and has a sharply protruding cross-section.

[0011] In an embodiment of the first aspect, the annular protrusion is implemented as a plurality of protrusions; the plurality of annular protrusions are arranged at radial intervals along the annular groove.

[0012] In the embodiment of the first aspect, the two said concave-convex sealing structures are arranged symmetrically.

[0013] In an embodiment of the first aspect, the sharp protrusions of the two opposing annular protrusions in the two said concave-convex sealing structures are arranged at a distance in the axial direction.

[0014] In an embodiment of the first aspect, the height of the annular protrusion is implemented as wavy or serrated along its circumference.

[0015] In an embodiment of the first aspect, a second pressure-stabilizing cavity is formed at the connection between the inner wall of the second flow channel and each of the pressure taps, enclosing the pressure taps; the ratio of the inner diameter of the second pressure-stabilizing cavity to the inner diameter of the pressure tap is 3-5.

[0016] In an embodiment of the first aspect, the air intake body includes an axially connected air intake pipe and a valve mounting pipe; the air outlet body is axially connected to the other end of the valve mounting pipe; and the sealing unit is provided between the air intake pipe and the valve mounting pipe.

[0017] The first aspect of this disclosure provides a fluid delivery pipeline, including the differential pressure flow meter.

[0018] As described above, this disclosure relates to the field of flow metering equipment technology, and provides a differential pressure flow meter and a fluid transport pipeline. The differential pressure flow meter includes an inlet body with a through-flow first channel; an outlet body with a through-flow second channel, which is fixedly connected to the inlet body in a manner that mates with and communicates with the first channel; a first pressure stabilizing chamber for mounting a flow resistance element is provided in the second channel; two pressure taps are formed on the outlet body, respectively connecting the second channel upstream and downstream of the flow resistance element, and a diameter change is formed between the flow sections of the second channel connected by the two pressure taps; a sealing unit includes a pair of annular grooves and an annular metal gasket disposed between them; the pair of annular grooves are respectively formed on the wall surfaces of the inlet body and the outlet body; the opposing wall surfaces of the pair of annular grooves are respectively provided with concave-convex sealing structures; wherein, when the inlet body and the outlet body are axially aligned, the annular metal gasket is plastically deformed and adheres to the concave-convex sealing structures on both sides by the concave-convex sealing structures on both sides, thereby forming a line-surface composite sealing structure between the inlet body, the outlet body and the annular metal gasket. The fluid transport pipeline includes the differential pressure flow meter. The line-surface composite sealing structure in this application utilizes the interaction between the concave-convex sealing structure and the annular metal gasket. By squeezing the concave-convex sealing structures on both sides, the annular metal gasket undergoes plastic deformation. This achieves an initial tight fit through the high specific pressure of "line contact" and expands the sealing coverage area through "surface contact," significantly improving the sealing reliability for gaseous media (especially high-pressure or flammable and explosive gases) and effectively preventing leakage. At the same time, the plastically deformed gasket can adaptively absorb the processing errors and assembly deviations of the inlet and outlet gas bodies, reducing the reliance on high-precision machining, simplifying the assembly process, and enhancing the stability and durability of the sealing system. Attached Figure Description

[0019] Figure 1 The diagram shown is a schematic representation of the overall structure of a differential pressure flow meter in one embodiment of this disclosure.

[0020] Figure 2 The figure shown is a cross-sectional schematic diagram of a differential pressure flow meter according to an embodiment of the present disclosure.

[0021] Figure 3 The diagram shown is a cross-sectional view of a differential pressure flow meter according to another embodiment of this disclosure.

[0022] Figure 4 The middle is shown as Figure 2 A magnified view of A in the middle.

[0023] Figure label:

[0024] Differential pressure flow meter; 110, Inlet body; 1101, First flow channel; 111, Inlet pipe; 112, Valve mounting pipe; 1102, Pressure measuring hole; 120, Outlet body; 1201, Second flow channel; 1202, Pressure tapping hole; 1203, Second pressure stabilizing chamber; 130, Sealing unit; 1301, Annular groove; 131, Annular metal gasket; 132, Annular protrusion; 140, Flow resistance element. Detailed Implementation

[0025] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the information disclosed herein. This disclosure can also be implemented or applied through other different specific embodiments, and various details in this disclosure can be modified or changed according to different viewpoints and application modules without departing from the spirit of this disclosure. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this disclosure can be combined with each other.

[0026] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings, so that those skilled in the art to which this disclosure pertains can readily implement it. This disclosure may be embodied in many different forms and is not limited to the embodiments described herein.

[0027] In this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic represented in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in any one or a group of embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples represented in this disclosure, as well as the features of those different embodiments or examples.

[0028] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this disclosure, "a set" means two or more, unless otherwise explicitly specified.

[0029] For the purpose of clarity, devices unrelated to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0030] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0031] While the terms first, second, etc., are used in some examples herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, module, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, modules, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0032] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this disclosure. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0033] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the message of the present disclosure, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0034] In related technologies, the measurement accuracy of differential pressure flowmeters is mainly limited by two major technical problems: First, the traditional single-point pressure tapping method on the sidewall is prone to inducing high-frequency flow field noise. Single-point drilling cannot effectively filter out vortices and boundary layer separation disturbances generated by flow resistance components, resulting in high-frequency oscillation of static pressure signals and low signal-to-noise ratio, which seriously affects the dynamic stability of the instrument. Second, the sealing structure is not reliable enough under complex working conditions. Traditional polymer seals are prone to aging and swelling, while metal seals are prone to micro-gap due to processing tolerances and thermal deformation, causing fluid "bypass leakage", which leads to attenuation and distortion of differential pressure signals, destroys the linear mapping relationship between differential pressure and flow rate, and ultimately causes the measurement results to deviate significantly from the true value.

[0035] Based on the above-mentioned problems, the line-surface composite sealing structure in this application, through the cooperation of the concave-convex sealing structure and the annular metal gasket, utilizes the mutual compression of the concave-convex sealing structures on both sides to cause plastic deformation of the annular metal gasket. This achieves initial tight fit through the high specific pressure of "line contact" and expands the sealing coverage area through "surface contact," significantly improving the sealing reliability for gaseous media (especially high-pressure or flammable and explosive gases) and effectively preventing leakage. At the same time, the plastically deformed gasket can adaptively absorb the processing errors and assembly deviations of the inlet and outlet bodies, reducing the dependence on high-precision machining, simplifying the assembly process, and enhancing the stability and durability of the sealing system.

[0036] Figure 1 The diagram shown is a schematic representation of the overall structure of a differential pressure flow meter in one embodiment of this disclosure. Figure 2 The image shown is a cross-sectional schematic diagram of a differential pressure flow meter according to an embodiment of this disclosure. Figure 1 and Figure 2 In the example, the differential pressure flow meter 100 includes an inlet body 110, an outlet body 120, and a sealing unit 130.

[0037] The intake body 110 has a through-flow channel 1101. The intake body 110 includes an intake pipe 111 and a valve mounting pipe 112 that are axially connected; the intake pipe 111 and the valve mounting pipe 112 each have a sub-flow channel that extends axially and is through-flowed. Therefore, when the intake pipe 111 and the valve mounting pipe 112 are circumferentially connected, the two sub-flow channels fit together to form the first flow channel 1101.

[0038] A first connecting unit is provided between the intake pipe 111 and the valve mounting pipe 112. This first connecting unit is used to fix the intake pipe 111 and the valve mounting pipe 112 together axially. In this embodiment, the first connecting unit specifically includes: four through holes arranged in a rectangle and coaxially formed on the intake pipe 111; four threaded inner holes also arranged in a rectangle and coaxially formed on the valve mounting pipe 112; and four screws (not shown in the figure). The screws pass through the through holes and are threaded into the threaded inner holes, thereby achieving axial docking and fixing of the intake pipe 111 and the valve mounting pipe 112. Those skilled in the art will understand that this four-point rectangular screw connection method can significantly improve the stability and torsional resistance of the connection, ensuring that the intake pipe 111 and the valve mounting pipe 112 maintain good concentricity when axially docked, thereby ensuring sealing effect and airflow stability. At the same time, this structure is easy to assemble and disassemble, which is beneficial for the later maintenance and repair of the equipment.

[0039] It should be noted that the sub-channel in the intake pipe 111 is coaxially arranged with the sub-channel in the valve mounting pipe 112.

[0040] The air outlet body 120 has a second flow channel 1201 extending through it along its axis. One end of the second flow channel 1201 forms an inlet, and the other end forms an outlet. The air outlet body 120 is fixedly connected to the air inlet body 110 in an inlet-connecting manner with the first flow channel 1101. For example, the air outlet body 120 is fixedly connected to the valve mounting seat, and its inlet is connected to a sub-flow channel in the valve mounting seat.

[0041] A second connecting unit is provided between the air outlet body 120 and the valve mounting pipe 112. This second connecting unit is used to fix the air outlet body 120 and the valve mounting pipe 112 together axially to ensure high coaxiality and connection rigidity after assembly. Specifically, the second connecting unit adopts the same structural form as the aforementioned first connecting unit, that is, it also includes four through holes and threaded inner holes arranged in a rectangular array, and is fastened by four screws. The technical effect is also the same, so it will not be described again here.

[0042] The second flow channel 1201 contains a first pressure-stabilizing chamber located at the position of the flow resistance element 140. Its main function is to provide a relatively stable fluid environment for the flow resistance element 140, preventing measurement instability caused by local turbulence or pressure fluctuations. Based on this, the outlet body 120 has two pressure taps 1202, which are connected to the second flow channel 1201 at upstream and downstream positions of the flow resistance element 140, respectively, thus forming pressure taps for differential pressure measurement. Specifically, a variable diameter structure is designed between the flow sections of the second flow channel 1201 corresponding to the two pressure taps 1202. This variable diameter design effectively adjusts the fluid velocity distribution and pressure gradient, making the upstream and downstream pressure signals more characteristic and stable. This structural layout not only improves the sensitivity and accuracy of the differential pressure signal but also effectively suppresses interference caused by fluid disturbances, thereby enhancing the stability and reliability of the entire differential pressure flowmeter 100 while ensuring measurement accuracy.

[0043] It should be noted that the variable diameter structure can be implemented as an installation step for mounting the flow resistance component 140; the installation step provides a precise axial positioning reference and limiting support for the internal flow resistance component 140. This structure ensures the coaxiality of the flow resistance component 140 during assembly line assembly and subsequent maintenance and replacement, avoiding internal structural tilting or flow field deviation caused by uneven assembly stress, and significantly reducing the assembly difficulty and life cycle maintenance cost of precision instruments.

[0044] It should be noted that the dashed lines in the figure are only a schematic diagram of the flow resistance element 140, and not the actual structure of the flow resistance element 140, because the flow resistance element 140 is specifically designed according to actual needs.

[0045] Preferably, each pressure tap 1202 is arranged perpendicular to the axial direction of the second flow channel 1201. This ensures that the axial direction of the pressure tap 1202 is orthogonal to the main fluid flow direction, minimizing the risk of fluid directly entering the pressure tap 1202 and causing dynamic pressure interference, thus ensuring that the collected pressure is closer to the actual hydrostatic pressure. Simultaneously, the vertical arrangement facilitates a smooth transition and connection with the second pressure stabilizing chamber 1203, allowing for sufficient fluid stagnation and pressure equalization within the chamber, thereby significantly improving the stability and measurement accuracy of the differential pressure signal.

[0046] Those skilled in the art will understand that the two pressure taps 1202 are connected to the high and low pressure ends of a differential pressure transmitter (not shown in the figure) via pressure guide pipes (not shown in the figure), respectively, to accurately measure the flow rate of the fluid in the pipeline by measuring the pressure difference upstream and downstream of the flow resistance element 140.

[0047] Figure 3 The image shown is a cross-sectional schematic diagram of a differential pressure flow meter according to another embodiment of this disclosure. Figure 3 In the example, a second pressure-stabilizing cavity 1203 is formed at the connection between the inner wall of the second flow channel 1201 and each of the pressure taps 1202, enclosing the pressure taps 1202. It is understood that the second pressure-stabilizing cavity 1203 effectively rectifyes and buffers the local eddies and high-speed jets generated by the disturbance of the flow resistance element 140, making the hydrostatic pressure at the pressure taps 1202 more stable and uniform. This not only eliminates measurement noise caused by flow field distortion but also significantly improves the stability and accuracy of the differential pressure signal between the upstream and downstream pressure taps, thereby reducing flow measurement errors and ensuring that the sensor readings truly reflect the operating parameters of the main flow channel.

[0048] In some embodiments, the ratio of the inner diameter of the second pressure-stabilizing cavity 1203 to the inner diameter of the pressure tapping hole 1202 is 3-5. Those skilled in the art will understand that it is necessary to ensure that the volume of the second pressure-stabilizing cavity 1203 is large enough to effectively absorb the local eddies and pulsations generated by the flow resistance element 140 to obtain a stable static pressure value; while also preventing the cavity of the second pressure-stabilizing cavity 1203 from being too large, which would lead to response lag and avoid the accumulation of impurities affecting long-term stability.

[0049] In this embodiment, a sealing unit 130 is provided between the air outlet body 120 and the air inlet body 110 (i.e., the valve mounting seat) to improve the sealing performance between the two.

[0050] Figure 4 The middle is shown as Figure 2 A magnified view of A in the diagram. Figure 2 and Figure 4 In the example, the sealing unit 130 includes a pair of annular grooves 1301 and an annular metal gasket 131 disposed between them.

[0051] A pair of annular grooves 1301 are respectively formed on the wall surfaces where the air intake body 110 and the air outlet body 120 meet. That is, an annular groove 1301 is recessed on the wall surfaces where the air intake body 110 and the air outlet body 120 meet. The annular groove 1301 on the air intake body 110 is arranged around the first flow channel 1101, and the annular groove 1301 on the air outlet body 120 is arranged around the second flow channel 1201.

[0052] Preferably, the annular groove 1301 on the air intake body 110 is coaxially arranged with the first flow channel 1101, and the annular groove 1301 on the air outlet body 120 is coaxially arranged with the second flow channel 1201.

[0053] The opposing walls of the pair of annular grooves 1301 are respectively provided with concave-convex sealing structures; wherein, when the air intake body 110 and the air outlet body 120 are axially connected, the annular metal gasket 131 is relatively squeezed by the concave-convex sealing structures on both sides to plastically deform and fit the concave-convex sealing structures on both sides, so as to form a line-surface composite sealing structure between the air intake body 110 and the air outlet body 120 and the annular metal gasket 131.

[0054] Those skilled in the art will understand that the line-surface composite sealing structure in this application, through the cooperation of the concave-convex sealing structure and the annular metal gasket 131, utilizes the mutual compression of the concave-convex sealing structures on both sides to cause the annular metal gasket 131 to undergo plastic deformation. This achieves initial tight fit through the high specific pressure of "line contact" and expands the sealing coverage area through "surface contact," significantly improving the sealing reliability for gaseous media (especially high-pressure or flammable and explosive gases) and effectively preventing leakage. At the same time, the plastically deformed gasket can adaptively absorb the processing errors and assembly deviations of the inlet body 110 and the outlet body 120, reducing the dependence on high-precision machining, simplifying the assembly process, and enhancing the stability and durability of the sealing system.

[0055] It should be noted that the hardness of the annular metal gasket 131 is less than that of the convex-concave sealing structure. This ensures that during axial mating, the lower-hardness annular metal gasket 131 preferentially undergoes controllable plastic deformation, thereby better filling and embedding into the surface of the higher-hardness convex-concave sealing structure, forming a tight and stable line-surface composite seal.

[0056] In some embodiments, the annular metal gasket 131 may be made of pure copper or pure aluminum; while the portions of the intake body 110 and the exhaust body 120 that form the concave-convex sealing structure are made of stainless steel or alloy steel.

[0057] In some embodiments, the cross-sectional shape of the concave-convex sealing structure includes lines and protruding endpoints. Those skilled in the art will understand that the lines, as the pressure-bearing surface in contact with the annular metal gasket 131, provide the primary surface contact sealing force; while the protruding endpoints serve as local stress concentration points. When the inlet body 110 and outlet body 120 are axially aligned and pressed together, these endpoints first penetrate or forcefully compress the annular metal gasket 131, causing significant plastic deformation of the gasket and filling the microscopic gaps, thereby forming a high-specific-pressure primary sealing line. Subsequently, the lines on both sides of the endpoints further adhere to the gasket, forming a secondary sealing surface. This "point-line combination" cross-sectional design achieves initial stress concentration sealing through the endpoints and expands the contact area and disperses overall pressure through the lines on both sides. While ensuring sealing reliability, it also provides a certain degree of self-positioning and centering, improving assembly accuracy and sealing stability.

[0058] In some embodiments, the lines can be implemented as straight lines and curves. For example, the two first lines forming the endpoints are straight lines; the second lines not forming the endpoints can be straight lines or curves. When the second line is a straight line, it can be arranged parallel to the opposing walls of the two annular grooves 1301, or inclined relative to the walls, or it can be implemented as part of the opposing walls of the two annular grooves 1301. When the second line is a curve, it can be formed by being concave or convex from the opposing walls of the two annular grooves 1301.

[0059] In some embodiments, each of the convex-concave sealing structures includes at least one annular protrusion 132 that protrudes from the wall of the annular groove 1301 toward another convex-concave sealing structure and has a sharply protruding cross-section.

[0060] In this embodiment, each of the concave-convex sealing structures uses only one annular protrusion 132. For example, the cross-sectional shape of the annular protrusion 132 is an inverted triangle, with one apex pointing towards another annular groove 1301. That is, the concave-convex sealing structure is formed by the remaining wall surfaces of the annular groove 1301 and the side walls and apex of the annular protrusion 132. Those skilled in the art will understand that, under axial preload, this sharp apex can first cut into the lower-hardness annular metal gasket 131, forming an annular sealing line with high specific pressure. Simultaneously, the inclined straight surfaces on both sides of the inverted triangle structure and the remaining wall surfaces of the annular groove 1301 form a surface contact fit with the metal gasket. After the gasket undergoes plastic deformation to fill the gap between the two annular grooves 1301, it provides stable support and secondary sealing. Thus, even with a single protrusion structure, a multi-layered sealing effect combining lines and surfaces is achieved, simplifying the processing steps and reducing manufacturing costs.

[0061] In other embodiments, the annular protrusions 132 are implemented as a plurality of protrusions; the plurality of annular protrusions 132 are arranged at radial intervals along the annular grooves 1301. It is understood that the radially spaced arrangement of the plurality of annular protrusions 132 can form multiple independent sealing barriers in the axial direction. Even if a minor leakage occurs in one barrier, subsequent protrusions can still provide effective sealing, significantly improving sealing redundancy and system reliability. At the same time, the multiple annular protrusions 132 gradually disperse the sealing pressure, avoiding stress concentration at a single location, thereby enhancing adaptability to thermal expansion and contraction and vibration conditions.

[0062] In this embodiment, the two raised and recessed sealing structures are symmetrically arranged. It is understood that the symmetrical arrangement of the two raised and recessed sealing structures can generate a uniform and balanced sealing pressure during axial compression, avoiding gasket misalignment or localized sealing failure due to uneven force. Simultaneously, this arrangement helps to automatically align and compensate for assembly errors, improving the coaxiality and stability of the connection, and ensuring consistent and reliable sealing performance throughout the entire ring.

[0063] However, it should be noted that when the two aforementioned concave-convex sealing structures are symmetrically arranged, the sharp protrusions of the two opposing annular protrusions 132 in the two concave-convex sealing structures are spaced apart in the axial direction. It is understood that this spaced arrangement prevents the sharp protrusions on both sides from directly severing or excessively cutting the annular metal gasket 131 during the compression process, thus preserving the continuity of the middle region of the annular metal gasket 131. Simultaneously, this gap provides a buffer space for the plastic deformation of the annular metal gasket 131, allowing it to flow towards the middle region and fully fill it under the compression of the sharp protrusions on both sides, forming a continuous, complete, and unbroken sealing entity, further improving the integrity and leakage resistance of the sealing structure under high pressure differential.

[0064] In other embodiments, the annular protrusions 132 in the two concave-convex sealing structures may also be distributed radially in an alternating pattern, and are not limited to this embodiment.

[0065] In other embodiments, the annular protrusion 132 is wavy or serrated along its circumference. Those skilled in the art will understand that this undulating structure ensures that, during axial pre-tightening, the annular metal gasket 131 forms a high-pressure point contact seal only at the crest, while allowing deformation space at the trough. This not only increases the meandering path for fluid leakage and creates a labyrinth-like throttling effect, but also effectively releases the circumferential stress generated by thermal expansion and contraction, preventing gasket loosening or seal failure due to temperature differences, and significantly improving the long-term stability of the sealing assembly under varying temperature conditions. When two or more annular protrusions 132 are implemented in the same concave-convex sealing structure, adjacent annular protrusions 132 that are wavy or serrated are staggered to further improve the sealing effect.

[0066] It should be noted that, in order to improve the sealing effect between the intake pipe 111 and the valve mounting pipe 112, a sealing unit 130 is also provided between the wall surfaces where the intake pipe 111 and the valve mounting pipe 112 meet, and the structure is the same. Please refer to the above content, so it will not be described again here.

[0067] Back to Figure 2In the example, a pressure measuring hole 1102 is formed on the air inlet pipe 111, which connects to the first flow channel 1101. A pressure sensor is connected to the other end of the pressure measuring hole 1102. This pressure sensor is mainly used to monitor the absolute pressure or gauge pressure in the first flow channel 1101 in real time, and transmits the pressure signal as a dynamic compensation reference to the post-processing circuit of the flow meter. Since the differential pressure measurement before and after the flow resistance element 140 is easily affected by the fluctuation of the upstream air supply pressure, by introducing the real-time inlet pressure obtained by the pressure measuring hole 1102, the system can perform online pressure compensation and correction on the differential pressure signal, thereby eliminating the nonlinear error caused by the change of inlet pressure and ensuring that high-precision standardized flow measurement results can be output under different operating pressure conditions.

[0068] It should be noted that, in order to prevent fluid leakage from the pressure measuring port 1102 and the pressure tapping port 1202, a connecting block is detachably connected to the outer opening of each of the pressure measuring port 1102 and the pressure tapping port 1202. A sealing unit 130 is provided between each connecting block and the air inlet body 110 and the air outlet body 120. The connection method between the connecting block and the air inlet body 110 and the air outlet body 120 can be implemented in the same way as the first connecting unit or the second connecting unit, so it will not be described in detail here.

[0069] Another embodiment of this disclosure provides a fluid delivery pipeline, including the differential pressure flow meter 100.

[0070] In summary, this disclosure relates to the field of flow metering equipment technology, and provides a differential pressure flow meter and a fluid transport pipeline. The differential pressure flow meter includes an inlet body with a through-flow first channel; an outlet body with a through-flow second channel, which is fixedly connected to the inlet body in a manner that mates with and communicates with the first channel; a first pressure stabilizing chamber for mounting a flow resistance element is provided in the second channel; two pressure taps are formed on the outlet body, respectively connecting the second channel upstream and downstream of the flow resistance element, and a diameter change is formed between the flow sections of the second channel connected by the two pressure taps; a sealing unit includes a pair of annular grooves and an annular metal gasket disposed between them; the pair of annular grooves are respectively formed on the wall surfaces of the inlet body and the outlet body; the opposing wall surfaces of the pair of annular grooves are respectively provided with concave-convex sealing structures; wherein, when the inlet body and the outlet body are axially aligned, the annular metal gasket is plastically deformed and adheres to the concave-convex sealing structures on both sides by the concave-convex sealing structures on both sides, thereby forming a line-surface composite sealing structure between the inlet body, the outlet body and the annular metal gasket. The fluid transport pipeline includes the differential pressure flow meter. The line-surface composite sealing structure in this application utilizes the interaction between the concave-convex sealing structure and the annular metal gasket. By squeezing the concave-convex sealing structures on both sides, the annular metal gasket undergoes plastic deformation. This achieves an initial tight fit through the high specific pressure of "line contact" and expands the sealing coverage area through "surface contact," significantly improving the sealing reliability for gaseous media (especially high-pressure or flammable and explosive gases) and effectively preventing leakage. At the same time, the plastically deformed gasket can adaptively absorb the processing errors and assembly deviations of the inlet and outlet gas bodies, reducing the reliance on high-precision machining, simplifying the assembly process, and enhancing the stability and durability of the sealing system.

[0071] The above embodiments are merely illustrative of the principles and effects of this disclosure and are not intended to limit this disclosure. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this disclosure. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this disclosure should still be covered by the protection scope of this disclosure.

Claims

1. A differential pressure flow meter, characterized in that, include: The main air intake unit has a through-flow channel; The air outlet body has a through-type second flow channel, and the second flow channel is fixedly connected to the air inlet body in a way that fits and communicates with the first flow channel; the second flow channel is provided with a first pressure stabilizing cavity for installing a flow resistance element; the air outlet body has two pressure taps that are respectively connected to the second flow channel upstream and downstream of the flow resistance element, and the flow segments of the second flow channel connected by the two pressure taps form a variable diameter; The sealing unit includes a pair of annular grooves and an annular metal gasket disposed between them; the pair of annular grooves are respectively formed on the wall surfaces of the air intake body and the air outlet body; the opposing wall surfaces of the pair of annular grooves are respectively provided with concave-convex sealing structures; When the air intake body and the air outlet body are axially aligned, the annular metal gasket is squeezed relative to the concave and convex sealing structures on both sides to plastically deform and fit the concave and convex sealing structures on both sides, so as to form a line-surface composite sealing structure between the air intake body and the air outlet body and the annular metal gasket.

2. The differential pressure flow meter according to claim 1, characterized in that, The cross-sectional shape of the convex-concave sealing structure includes lines, endpoints, and lines in sequence; and / or, the hardness of the annular metal gasket is less than the hardness of the convex-concave sealing structure.

3. The differential pressure flow meter according to claim 1, characterized in that, Each of the aforementioned concave-convex sealing structures includes at least one annular protrusion that protrudes from the wall of the annular groove toward the other concave-convex sealing structure and has a sharply protruding cross-section.

4. The differential pressure flow meter according to claim 3, characterized in that, The annular protrusions are implemented as a plurality of them; the plurality of annular protrusions are arranged at radial intervals along the annular groove.

5. The differential pressure flow meter according to claim 3, characterized in that, The two concave-convex sealing structures are arranged symmetrically.

6. The differential pressure flow meter according to claim 3 or 5, characterized in that, The sharp protrusions of the two opposing annular protrusions in the two said concave-convex sealing structures are arranged at a distance in the axial direction.

7. The differential pressure flow meter according to claim 3, characterized in that, The height of the annular protrusion is wavy or serrated along its circumference.

8. The differential pressure flow meter according to claim 1, characterized in that, A second pressure-stabilizing cavity is formed at the connection between the inner wall of the second flow channel and each of the pressure taps, enclosing the pressure taps; the ratio of the inner diameter of the second pressure-stabilizing cavity to the inner diameter of the pressure tap is 3-5.

9. The differential pressure flow meter according to claim 1, characterized in that, The air intake body includes an axially connected air intake pipe and a valve mounting pipe; the air outlet body is axially connected to the other end of the valve mounting pipe; and the sealing unit is provided between the air intake pipe and the valve mounting pipe.

10. A fluid transport pipeline, characterized in that, include: The differential pressure flow meter as described in any one of claims 1-9.

Images