Anti-turbulence valve and ultrasonic gas meter adopting same

Abstract

The invention discloses an anti-turbulence valve and an ultrasonic gas meter adopting the anti-turbulence valve, the anti-turbulence valve comprises a valve body, a bent and extended flow path, a gas inlet and a gas outlet are formed in the valve body, the gas inlet and the gas outlet are respectively communicated with the flow path, and gas entering from the gas inlet is discharged from a gas outlet after being buffered and rectified in the flow path. And a piston is arranged in the flow path and can act under the action of the driving unit to open or close the flow path. The ultrasonic gas meter comprises a shell, and a metering module and an anti-turbulence valve are arranged in the shell. The device is reasonable in structure, good in anti-turbulence rectification effect, and beneficial to improving the measurement precision.

Description

Technical Field

[0001] The invention relates to the technical field of gas meter equipment, in particular to an anti-disturbance valve and an ultrasonic gas meter using the anti-disturbance valve. Background Art

[0002] Ultrasonic gas meters are gaining more and more attention from the market due to their advantages such as no spoilers and high precision. They are key technical equipment for the development of gas metering. The stability of the gas flow field in the measuring section of the gas meter determines the accuracy of ultrasonic metering. In measurement practice, the gas enters the gas meter through the valve and then enters the measuring section. The existing valve design only plays the role of a switch. There are still many turbulence or vortex flow fields after the gas flows through the valve. When the rectification effect in the measuring section is not ideal, the turbulence or vortex flow field in the measuring section will cause the measurement results to deviate from the real data, which is not conducive to improving the measurement accuracy.

[0003] In the prior art, there are also rectifiers arranged inside the shell of the ultrasonic gas meter and outside the valve, such as shown in application number 202123020730.2 and titled "A new ultrasonic gas meter flow channel for improving flow field stability", and as shown in application number 202022843026.6 and titled "A flow meter". The rectifier arranged outside the valve not only takes up a large space, but also has an unsatisfactory rectification effect. Summary of the invention

[0004] The present invention discloses an anti-disturbance valve and an ultrasonic gas meter using the same, which solves the technical problems of poor anti-disturbance and rectification effects in the prior art gas meter valve, which are not conducive to improving measurement accuracy, and has reasonable structure, good anti-disturbance and rectification effects, and is conducive to improving measurement accuracy. The technical solution adopted is as follows: An anti-disturbance valve comprises a valve body, wherein a curved and extended flow path is formed in the valve body, wherein the flow path respectively connects an air inlet and an air outlet, wherein the gas entering through the air inlet is discharged from the exhaust port after being buffered and rectified in the flow path, and a piston is arranged in the flow path, wherein the piston can be moved under the action of a driving unit to open or close the flow path.

[0005] Based on the above technical solution, the valve body includes an outer shell and an inner shell that are mounted together. The outer shell has an opening at the top to form an air outlet, the inner shell includes a hollow cavity and an air inlet is formed at the upper end, the inner shell extends downward into the outer shell and is connected with the inner cavity of the outer shell at the lower part, and the piston can cut off the hollow cavity of the inner shell to open or close the flow path.

[0006] On the basis of the above technical solution, the lower part of the inner shell extending into the outer shell includes an expansion part, and the expansion part is designed so that when the piston is at the lowest limit position, an annular flow guide port is formed between the expansion part and the piston, and the flow path is opened; when the piston is at the highest limit position, the piston abuts against the inner top surface of the expansion part, and the flow path is cut off.

[0007] On the basis of the above technical solution, a grid is further provided in the flow path to buffer and rectify the gas flowing through the flow path.

[0008] On the basis of the above technical solution, the grille is arranged at the air outlet of the flow path and is respectively connected to the outer shell and the inner shell.

[0009] On the basis of the above technical solution, the grille includes a plurality of evenly arranged air holes, the hole depth of the air holes is 1.2 to 1.5 times the equivalent diameter of the air holes; the air holes are one of long strip holes, polygonal holes or circular holes.

[0010] On the basis of the above technical solution, a reflux cavity is formed between the outer shell and the inner shell, and a filter material is arranged in the reflux cavity to filter and clean the gas flowing through.

[0011] Based on the above technical solution, the filter material is designed to filter dust particles and suspended solids with a size greater than or equal to 5um, and the filter efficiency of the filter material is 90% or more. Preferably, the filter material is gas filter cotton.

[0012] An ultrasonic gas meter comprises a shell, in which a metering module and the anti-disturbance valve as described above are arranged, the anti-disturbance valve is fixedly arranged in the shell, the air inlet of the anti-disturbance valve is communicated with the gas inlet on the shell, the air outlet of the anti-disturbance valve faces the inner wall surface of the shell, the metering module is fixedly arranged in the shell, the air outlet of the metering module is communicated with the gas outlet on the shell, the metering module comprises a measuring section, and a detection unit can detect the gas flowing through the measuring section and send a signal to an external controller.

[0013] Based on the above technical solution, the anti-turbine valve is fixed on the inner top surface of the shell, and the air outlet of the anti-turbine valve faces the inner top surface of the shell, the metering module is arranged below the anti-turbine valve, and the metering module and the anti-turbine valve are arranged on both sides of the shell.

[0014] Beneficial Effects The present invention has a reasonable structure. A bent and extended flow path is formed in the valve body. During the diffusion of the gas in the flow path, it collides with the inner wall of the flow path multiple times and at multiple angles. This not only effectively buffers the airflow, but also decomposes a large vortex into multiple small vortices, which is beneficial to reducing the turbulent flow field and further beneficial to improving the measurement accuracy.

[0015] The valve body in the present application has a compact structure and occupies little space. The valve body includes an outer shell and an inner shell that are arranged in a sleeve. The inner shell also includes an expansion section. On the one hand, the expansion section extends the length of the straight-through pipe section of the air inlet, which can preliminarily rectify the gas at the air inlet, and at the same time fully diffuse the gas entering through the air inlet, providing favorable conditions for the gas to enter the outer shell in an annular and uniform manner; on the other hand, the annular guide port arranged near the end of the collision section of the piston and formed together with the collision section allows the airflow to advance along the U-shaped flow path to initially break up and buffer the gas flow; on the other hand, the gas diffuses circumferentially into the outer shell through the annular guide port, and the flow path suddenly becomes larger, further buffering the gas flow, causing the vortex airflows in the flow path to collide and dissolve with each other, which is beneficial to improving the anti-disturbance performance of the valve; on the other hand, a grid is also provided at the outlet of the flow path, and the grid has a certain thickness, which further rectifies the gas flow, and at the same time further dissolves the vortex airflow therein to create a smooth flow field.

[0016] In the present invention, a filter material is provided in the reflux cavity between the outer shell and the inner shell to filter and clean the gas flowing therethrough, thereby reducing the influence of dust on the measurement accuracy of the ultrasonic gas meter and facilitating the improvement of the service life of the ultrasonic gas meter.

[0017] The arrangement of the air inlet and the air outlet of the flow path in the present invention provides favorable conditions for forming an air outlet with a larger cross-section, which is beneficial to reducing the pressure loss of the air inlet and the air outlet of the valve, ensuring sufficient flow area, and improving the measurement accuracy and reliability of the ultrasonic gas meter. In addition, the valve exhaust port and the air inlet are arranged in the same direction, and the valve exhaust port is arranged in the same direction as the air inlet of the metering module, so that the gas flow can be further buffered in the shell, further improving the measurement accuracy and reliability of the ultrasonic gas meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 : A schematic diagram of the three-dimensional structure of the present invention; Figure 2 : A schematic diagram of the cross-sectional structure of the main view of the present invention; Figure 3 : A schematic diagram of a cross-sectional three-dimensional structure of a side view of the present invention; Figure 4 : Schematic diagram of the cross-sectional structure of the main view of the ultrasonic gas meter; Figure 5 : Figure 4Schematic diagram of the three-dimensional structure of the ultrasonic gas meter; Figure 6 : Schematic diagram of velocity cloud diagram on the axis surface of the measurement section according to the embodiment of the present invention; Figure 7 : Schematic diagram of gas velocity distribution curve at the inlet of the measuring section; Figure 8 : Figure 7 A partial enlarged view of the gas velocity distribution curve; DETAILED DESCRIPTION The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0020] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] As used herein, unless otherwise specified, the term "plurality" means two or more than two.

[0022] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0023] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0024] like Figures 1 to 3 The anti-disturbance valve 1 shown in FIG. 1 includes a valve body 11, as shown in FIG. Figure 1 As shown, the valve body 11 includes an outer shell 112 and an inner shell 111, the outer shell 112 is closed at the lower end and open at the upper end to form an air outlet 12; like Figure 2 As shown, the inner shell 111 is in a hollow tubular shape and includes a hollow cavity. The inner shell 111 extends downward into the outer shell 112 and communicates with the inner cavity of the outer shell 112 at the lower part. The upper end of the inner shell 111 forms an air inlet 13. In addition, the lower part of the inner shell 111 extending into the outer shell 112 includes an expansion part 114, and the diameter of the expansion part 114 is larger than the diameter at the upper end of the inner shell 111. In addition, the side wall of the inner shell 111 extending out of the outer shell 112 is vertically fixed with an ear plate 110, and the ear plate 110 is provided with a connection hole.

[0025] In this way, a curved and extended flow path is formed in the valve body 11 , which is roughly in a UU shape, and the flow path is connected to the air inlet 13 and the air outlet 12 respectively.

[0026] A piston 14 is provided in the flow path, and the piston 14 can be moved by the driving unit to open or close the flow path. Figure 2 and 3 As shown, the piston 14 is fixedly connected downward with a screw 18, which is slidably connected to the bottom surface of the housing 112. The drive unit includes a motor, which can drive the screw 18 to drive the piston to move up and down, so as to open or close the flow path. The motor driving the screw to move up and down is a prior art and will not be repeated here.

[0027] In addition, the expansion part 114 is designed to be arranged near the end of the expansion part 114 when the piston 14 is at the lowest limit, so that an annular guide port 15 is formed between the expansion part 114 and the piston 14, and the flow path is opened. The annular guide port 15 can guide the gas entering through the air inlet 13 to collide with the top surface of the piston 14 and diffuse into the outer shell 112 circumferentially, buffering and breaking up the gas flow, and dissolving the large vortex into a small vortex; when the piston 14 is at the highest limit, the piston 14 abuts against the inner top surface of the expansion part 114, and the flow path is cut off. In order to ensure the reliability of the flow path cutoff, an elastic pad is also provided on the inner top surface of the expansion part 114. In this embodiment, the outer shell and the inner shell are coaxial and uniformly tubular. In other embodiments of the present invention, the cross-sections of the outer shell and the inner shell can also be square.

[0028] like Figure 2 As shown, a grille 16 is provided in the flow path to buffer and rectify the gas flowing through the flow path. Specifically, the grille 16 is provided at the flow path gas outlet 12 and is respectively connected to the outer shell 112 and the inner shell 111. The grille 16 includes a plurality of evenly arranged air holes 161. In this embodiment, the air holes 161 are long strip holes, and the plurality of air holes 161 are evenly arranged circumferentially, wherein the hole depth of the air holes 161 is 1.2 to 1.5 times the hole depth equivalent diameter D of the air holes 161. The equivalent diameter D=4*A / L, wherein A is the cross-sectional area of ​​the air holes 161, and L is the wetted perimeter of the flow path, that is, the boundary length in contact with the air flow. In other embodiments of the present invention, the air holes 161 may also be one of polygonal holes or circular holes.

[0029] The grille 16 can buffer the rectified gas flow, further eliminate the vortex, and divide the small vortex into smaller vortices. On the other hand, it can also support the inner cylinder 111, simplify the structure, and have multiple functions. In the present application, the grille 16 has a certain thickness, which can eliminate the influence of the vortex on the air flow and form a stable and fully developed air flow trend with good guidance.

[0030] In addition, to facilitate disassembly and cleaning, in other embodiments of the present invention, the grille 16 is fixedly connected to the inner shell 111, and the grille 16 is detachably connected to the outer shell 112.

[0031] In addition, if Figure 2 As shown, the reflux chamber 19 between the outer shell 112 and the inner shell 111 is provided with a filter material 17, and the filter material 17 is designed to filter particulate dust and suspended matter with a particle size greater than or equal to 5um in the airflow, and the filtration efficiency is 90% or above. In this embodiment, the filter material 17 uses gas filter cotton, and in other embodiments of the present invention, filter materials of other materials can also be used. The filter material 17 is annular and transitionally matched with the reflux chamber 19, so that the filter material is kept in a set position under the action of friction and filters out particulate matter in the gas, wherein the filter material 17 is a prior art and will not be described here.

[0032] In this way, the gas entering through the air inlet 13 is discharged from the exhaust port 12 after being buffered and rectified in the flow path, forming a uniform and stable flow field, which is beneficial to improving the measurement accuracy and reliability.

[0033] like Figure 4 and 5 The ultrasonic gas meter shown in the figure comprises a housing 3, a gas inlet 31 and a gas outlet 32 ​​are arranged on the housing 3, a metering module 2 and an anti-disturbance valve 1 are arranged inside the housing 3, as shown in FIG. Figure 4As shown, the anti-turbine valve 1 is fixed on the inner top surface of the shell 3 through two ear plates 110, the air inlet 13 of the anti-turbine valve 1 is connected with the gas inlet 31 on the shell 3, and the air outlet 12 of the anti-turbine valve 1 faces the inner top surface of the shell 3, so that the gas discharged through the air outlet 12 collides with the inner top surface of the shell 3 and then returns, which can further buffer the airflow and reduce the vortex airflow therein, while guiding the gas airflow to diffuse downward to approach the metering module 2.

[0034] The metering module 2 is fixed in the housing 3 through a vertical plate fixed in the housing 3. The metering module 2 includes a measuring section, such as Figure 5 As shown, the metering module 2 is arranged below the anti-disturbance valve 1, and the metering module 2 and the anti-disturbance valve 1 are arranged on both sides of the housing 3. The measuring section can detect the gas flowing through and send a signal to the external controller. The metering module for gas is a prior art, as shown in the application number CN202311427433.0 entitled An Ultrasonic Gas Meter Module and Ultrasonic Flow Meter, which will not be described here.

[0035] Taking the inlet 13 cross-sectional radius of 11.5 mm and the gas flow rate of 6 m³ / h as an example, the flow field velocity simulation analysis is performed on the measurement section in this embodiment through the flow field simulation analysis software to obtain the velocity cloud map on the axial surface of the measurement section, as shown in FIG. Figure 6 As shown, from Figure 6 It can be seen that the gas discharged through the anti-disturbance valve collides with the top surface of the shell and enters the measuring section of the metering module. After a small fluctuation at the inlet of the measuring section, it flows smoothly through the measuring section.

[0036] In addition, the anti-disturbance valve in the present application is used, and the pressure loss between the gas inlet 31 and the gas outlet 32 ​​is calculated and analyzed to be 215Pa, which meets the national standard requirement of 250Pa.

[0037] At the entrance of the measuring section of the metering module, considering the effective range of the ultrasonic transducer, a circular section with a radius of 6 mm was taken for linear velocity analysis. The velocity distribution curve is shown in the figure below: Figure 7 and 8 As shown, compared with the ordinary valve with the same interface size (corresponding to Figure 7 and 8 The blue curve in the middle), the velocity distribution curve in the measurement section of this application is (corresponding to Figure 7 and 8The red curve in the middle is more uniform, especially in the middle flow channel of the measuring section, the gas velocity distribution is smoother, that is, the peak value of the gas velocity distribution in the middle flow channel is effectively reduced, and the peak values ​​of the velocity distribution in the flow channels on both sides of the middle flow channel are also reduced, so that the discreteness of the gas flow velocity at the inlet of the measuring section is small and the velocity distribution is smoother. On the one hand, it is beneficial for the gas to achieve smooth diffusion in the measuring section faster, and then it is beneficial to reduce the length of the measuring section and make the gas meter compact. On the other hand, it alleviates the difference in gas flow velocity distribution caused by the different relative valve positions at the inlet of the measuring section to a certain extent. On the other hand, the setting of the anti-disturbance valve in the present application also makes the pressure field distribution in the gas meter more uniform, reduces the pressure difference in different areas of the pressure field, and further improves the anti-disturbance effect of the overall flow field in the gas meter.

[0038] Starting from the center of the circular cross-section at the inlet of the measuring section, the valve was extended 6 mm in radial direction to both sides, and then the velocity values ​​of 80 position points were intercepted at equal intervals of 0.15 mm. The samples with velocity values ​​greater than 6 m / s at the position points were statistically analyzed. The data after statistical analysis showed that compared with ordinary valves with the same interface size, the standard deviation of the velocity values ​​at 80 position points in this application was reduced by 8.6%, that is, the velocity distribution at the inlet of the measuring section in this application was smoother.

[0039] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications made based on the present invention belong to the scope of protection claimed by the present invention.

Claims

1. An anti-turbine valve (1), characterized in that: The valve body (11) comprises a valve body (11), wherein a curved and extended flow path is formed in the valve body (11), wherein the flow path respectively connects an air inlet (13) and an air outlet (12), wherein the fuel gas entering through the air inlet (13) is discharged from the exhaust port (12) after being buffered and rectified in the flow path, and a piston (14) is provided in the flow path, wherein the piston (14) can be moved under the action of a driving unit to open or close the flow path.

2. The spoiler valve (1) according to claim 1, characterized in that: The valve body (11) comprises an outer shell (112) and an inner shell (111) which are sleeved together. The outer shell (112) is opened at the top and forms an air outlet (12). The inner shell (111) comprises a hollow cavity and an air inlet (13) is formed at the upper end. The inner shell (111) extends downward into the outer shell (112) and is connected to the inner cavity of the outer shell (112) at the lower part. The piston (14) can cut off the hollow cavity of the inner shell (111) to open or close the flow path.

3. The spoiler valve (1) according to claim 2, characterized in that: The lower portion of the inner shell (111) extending into the outer shell (112) comprises an expansion portion (114). The expansion portion (114) is designed such that, when the piston (14) is at the lowest limit position, an annular flow guide port (15) is formed between the expansion portion (114) and the piston (14), and the flow path is opened; and when the piston (14) is at the highest limit position, the piston (14) abuts against the inner top surface of the expansion portion (114), and the flow path is closed.

4. The anti-turbulence valve (1) according to claim 2 or 3, characterized in that: A grid (16) is also provided in the flow path to buffer and rectify the gas flowing through the flow path.

5. The anti-turbine valve (1) according to claim 4, characterized in that: The grille (16) is arranged at the air outlet (12) of the flow path and is respectively connected to the outer shell (112) and the inner shell (111).

6. The anti-turbine valve (1) according to claim 5, characterized in that: The grille (16) comprises a plurality of evenly arranged air holes (161), wherein the hole depth of the air holes (161) is 1.2 to 1.5 times the equivalent diameter of the air holes (161); and the air holes (161) are one of elongated holes, polygonal holes or circular holes.

7. The anti-turbine valve (1) according to claim 5 or 6, characterized in that: A reflux chamber (19) is formed between the outer shell (112) and the inner shell (111), and a filter material is arranged in the reflux chamber (19) to filter and clean the gas flowing through.

8. The anti-turbine valve (1) according to claim 7, characterized in that: The filter material is designed to filter particulate dust and suspended matter with a size greater than or equal to 5 um, and the filter efficiency of the filter material is 90% or more.

9. An ultrasonic gas meter, comprising a housing (3), characterized in that: The housing (3) is provided with a metering module (2) and an anti-turbine valve (1) as claimed in any one of claims 1 to 3, 5 and 6. The anti-turbine valve (1) is fixedly arranged in the housing (3). The air inlet (13) of the anti-turbine valve (1) is communicated with a gas inlet (31) on the housing (3). The air outlet (12) of the anti-turbine valve (1) faces the inner wall surface of the housing (3). The metering module (2) is fixedly arranged in the housing (3). The air outlet of the metering module (2) is communicated with a gas outlet (32) on the housing (3). The metering module (2) comprises a measuring section. The detection unit can detect the gas flowing through the measuring section and send a signal to an external controller.

10. The ultrasonic gas meter according to claim 9, characterized in that: The anti-turbine valve (1) is fixedly mounted on the inner top surface of the housing (3), and the air outlet (12) of the anti-turbine valve (1) faces the inner top surface of the housing (3); the metering module (2) is arranged below the anti-turbine valve (1), and the metering module (2) and the anti-turbine valve (1) are arranged on two sides of the housing (3).

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