Ultrasonic gas meter based on flow distribution metering device

Abstract

An ultrasonic gas meter based on a flow distribution metering device. A gas flow stabilizing device (001) used for stabilizing a gas flow is mounted inside a gas meter housing (100); a vent hole (110) adapted for passage of the gas flow is provided in the middle of the gas meter housing (100); an ultrasonic metering device (112) used for gas metering is mounted in the middle of the cavity of the vent hole (110); and flow distribution plates (113) used for gas flow distribution are mounted at one end of the cavity of the vent hole (110). By means of the engagement of a first flow stabilizing assembly (200), a second flow stabilizing assembly (300), a third flow stabilizing assembly (400), a limiting assembly (500) and a rotation assembly (600), the gas flow rate slows down, thus finally forming a stable gas flow, enabling more accurate metering by the ultrasonic metering device; and the service life is prolonged by means of the provision of a filter screen (111).

Description

An ultrasonic gas meter based on a shunt metering device Technical Field

[0001] The present invention relates to the technical field of gas flow measurement of ultrasonic gas meters, and in particular to an ultrasonic gas meter based on a shunt metering device. Background Art

[0002] In an ultrasonic gas meter equipped with a diversion metering device, the amount of gas passing through the gas pipeline per unit time is measured by the time difference method. The time difference between the propagation of the downstream ultrasonic signal and the upstream ultrasonic signal in the gas is detected, and the gas flow rate is calculated based on the time difference. The gas flow rate passing through the gas pipeline per unit time is then calculated based on the gas flow rate.

[0003] The flow rate flowing through the center of the gas pipeline is usually greater than the flow rate flowing through the two side walls of the gas pipeline. When a large flow of gas passes through the gas pipeline, the flow rate in the center of the gas pipeline is greater than the flow rate on the side walls of the pipeline, which will have a greater impact on the ultrasonic signal in the center of the gas pipeline and affect the accuracy of the final measurement results.

[0004] Summary of the Invention

[0005] In order to solve the problem raised in the above background technology that the measurement results are easily affected when the center flow of the gas pipeline is greater than the side wall flow, the present invention provides the following technical solutions:

[0006] An ultrasonic gas meter based on a shunt metering device comprises a gas meter housing.

[0007] An air flow stabilizing device for stabilizing the air flow is installed inside the gas meter housing.

[0008] A vent hole for gas circulation is provided in the middle of the gas meter housing. An ultrasonic metering device for gas metering is installed in the middle of the vent hole cavity. A diverter plate for diverting gas is installed at one end of the vent hole cavity.

[0009] The airflow stabilizing device includes a first flow stabilizing component for blocking the gas, and the airflow stabilizing device includes a second flow stabilizing component for cooperating with the first flow stabilizing component to block the gas.

[0010] The airflow stabilizing device includes a limiting component for supporting and limiting the first flow stabilizing component and the second flow stabilizing component. A third flow stabilizing component is installed at one end of the limiting component for cooperating with the gas to control the angle change of the first flow stabilizing component and the second flow stabilizing component. A rotating component is installed inside the limiting component for cooperating with the third flow stabilizing component to control the rotation of the second flow stabilizing component.

[0011] Furthermore, a filter for filtering impurities is installed at the air inlet end of the gas meter housing.

[0012] Furthermore, the first flow stabilizing component includes a first baffle for blocking the gas, and a connecting ring 1 for limiting the first baffle is installed at both upper and lower ends of one side of the first baffle, and a first gear block group for cooperating with the limiting assembly to control the rotation of the first baffle is installed at one end of the connecting ring 1, and a connecting hole 1 for rotation of the limiting assembly is opened in the middle of the connecting ring 1, and a limiting ring block 1 for cooperating with the limiting assembly to limit the first flow stabilizing component is installed on the inner walls of the upper and lower ends of the hole cavity of the connecting hole 1.

[0013] Furthermore, the second flow stabilizing assembly includes a second baffle for cooperating with the first baffle to block the gas, and a connecting ring 2 for limiting the second baffle is installed at both upper and lower ends of one side of the second baffle, and a second gear block group for cooperating with the limiting assembly to control the rotation of the connecting ring 1 is installed at one end of the connecting ring 2, and the connecting hole 1 and the connecting hole 2 are concentric circles with each other, and the connecting ring 1 is located in the middle of the two connecting rings 2.

[0014] Furthermore, a second connecting hole is provided in the middle of the connecting ring 2 for the rotation of the limiting component, and the inner walls of the upper and lower ends of the hole cavity of the connecting hole 2 are both installed with a second limiting ring block for cooperating with the limiting component to limit the second flow stabilizing component, and a third gear block group is installed in the middle of the hole cavity of the connecting hole 2 for cooperating with the rotating component to control the rotation of the second flow stabilizing component.

[0015] Furthermore, the third flow stabilizing assembly includes a limiting rod 1, one end of which is equipped with a fourth gear block group for controlling the rotation of the rotating assembly, and the other end of which is equipped with a third baffle for controlling the extension and retraction of the limiting rod 1.

[0016] Furthermore, the limit assembly includes a limit rod 2, and the upper and lower ends of the limit rod 2 are provided with limit holes for limiting the limit rod 1, and the upper and lower ends of the limit rod 2 are provided with a limit ring groove 1 for the limit ring block 2 to rotate, and the upper and lower ends of the limit rod 2 are provided with a limit ring groove 2 for the limit ring block 1 to rotate, and the arrangement order of the limit hole, the limit ring groove 1 and the limit ring groove 2 on the rod body of the limit rod 2 is the limit hole, the limit ring groove 1, the limit ring groove 2, the limit ring groove 2, the limit ring groove 1 and the limit hole.

[0017] Furthermore, fan-shaped grooves for rotation of the rotating assembly are provided at the upper and lower ends of the rod body of the limiting rod 2, and the fan-shaped grooves are arranged between adjacent limiting ring grooves 1. Gear 1 is installed at the upper and lower ends of the limiting rod 2 for cooperating with the connecting ring 2 to control the connecting ring 1 to rotate in the opposite direction, and a connecting rod for cooperating with the limiting rod 2 to limit the gear 1 is connected to the middle part of the gear 1, and one end of the connecting rod is engaged with the second tooth block group, and the other end of the connecting rod is engaged with the first tooth block group, and the connecting rod is arranged between the limiting ring groove 1 and the limiting ring groove 2.

[0018] Furthermore, the rotating assembly includes a long rod, and gear 2 is installed at the upper and lower ends of the long rod for cooperating with limit rod 1 to control the rotation of the long rod. Special-shaped gears are installed at the upper and lower ends of the long rod for controlling the rotation of the second baffle, and the special-shaped gears are engaged with the third gear block group.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] Through the cooperation of the first flow stabilizing component, the second flow stabilizing component, the third flow stabilizing component, the limit component and the rotating component, the gas flow rate is slowed down, and a smooth airflow is finally formed, making the ultrasonic metering device more accurate in measurement, and through the setting of the filter, the service life of the present invention is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the internal structure of an ultrasonic gas meter according to the present invention;

[0022] FIG2 is a schematic structural diagram of an airflow stabilizing device according to the present invention;

[0023] FIG3 is a schematic structural diagram of a first flow stabilizing assembly according to the present invention;

[0024] FIG4 is a schematic structural diagram of a second flow stabilizing assembly according to the present invention;

[0025] FIG5 is a schematic structural diagram of a third flow stabilizing assembly of the present invention;

[0026] FIG6 is a schematic structural diagram of a position limiting assembly according to the present invention;

[0027] FIG7 is a schematic structural diagram of the rotating assembly of the present invention.

[0028] In the accompanying drawings, the names of the components represented by the various reference numerals are as follows: 100 - Gas meter housing; 110 - Vent, 111 - Filter, 112 - Ultrasonic metering device, 113 - Diverter plate; 001 - Airflow stabilizing device; 200 - First flow stabilizing assembly, 210 - First baffle, 211 - First arc-shaped groove edge, 220 - Connecting ring 1, 221 - Connecting hole 1, 222 - First tooth block group, 223 - Limiting ring block 1; 300 - Second flow stabilizing assembly, 310 - Second baffle, 311 - Second arc-shaped groove edge, 320 - Connecting ring 2, 321 - Connecting hole 2, 322 - Second tooth block group, 323 - Limiting ring block 2, 324 - Third tooth block group; 400 - Third flow stabilizing assembly, 410 - Limiting rod 1, 411 - Fourth tooth block group, 420 - Third baffle; 500-limiting assembly, 510-limiting rod 2, 511-limiting hole, 512-limiting ring groove 1, 513-limiting ring groove 2, 514-fan-shaped groove, 520-gear 1, 521-connecting rod; 600-rotating assembly, 610-long rod, 620-gear 2, 630-special-shaped gear. DETAILED DESCRIPTION

[0029] The following describes in detail the preferred embodiments of the present invention, and provides a clear and complete description in conjunction with the accompanying drawings.

[0030] 1 to 7 , the present invention provides an ultrasonic gas meter based on a flow splitting metering device, which keeps the flow rate of the gas in each ventilation slot consistent, thereby improving the metering accuracy of the ultrasonic metering device 112 .

[0031] A vent hole 110 for gas circulation is provided in the middle of the gas meter housing 100. A filter screen 111 for filtering impurities is installed at the air inlet end of the gas meter housing 100. One end close to the filter screen 111 is set as an air inlet, and the other end is set as an air outlet. A number of air holes of different apertures are provided in the middle of the filter screen 111 to facilitate the passage of gas. The filter screen blocks impurities carried by the gas on the filter screen 111, making the gas flowing to the airflow stabilizing device 001, the ultrasonic metering device 112 and the diverter plate 113 cleaner, and ensuring the long-term cleanliness of the surface of the ultrasonic metering device 112, thereby improving the measurement accuracy and extending the service life of the present invention.

[0032] An ultrasonic metering device 112 for ultrasonically measuring the gas is fixedly mounted in the middle of the cavity of the vent 110. A diverter plate 113 for diverting the gas is mounted at one end of the cavity of the vent 110. The diverter plate 113 cooperates with the inner wall of the vent 110 to form multiple ventilation slots, and the ultrasonic metering device 112 is located in one of the ventilation slots to perform ultrasonic measurement of the gas therein. When the gas enters through the air inlet of the vent 110, it is filtered by the filter 111, allowing the clean gas to flow steadily through the air flow stabilization device 001, so that the gas flowing to the diverter plate 113 is stable, and thus the gas flow in the multiple ventilation slots is stable, making the measurement of the ultrasonic metering device 112 more accurate.

[0033] A plurality of airflow stabilizing devices 001 for stabilizing the airflow are installed inside the gas meter housing 100. The airflow stabilizing device 001 includes a first flow stabilizing component 200 for blocking the gas. The first flow stabilizing component 200 includes a first baffle 210 for blocking the gas. One side of the first baffle 210 is set as a first arc-shaped groove edge 211, so that when the first baffle 210 rotates on the rod body of the limiting rod 2 510, the gas is blocked to prevent the gas from flowing through the gap formed between the first baffle 210 and the limiting rod 2 510. A connecting ring 1 220 for limiting the first baffle 210 is fixedly installed at both upper and lower ends of one side of the first baffle 210, so that when the connecting ring 1 220 rotates, it synchronously drives the first baffle 210 to rotate. One end of the connecting ring 1 220 is installed with a first tooth block group 222 for cooperating with the limiting component 500 to control the rotation of the first baffle 210, and the first tooth block group 222 and the gear 1 520 are engaged, so that when the connecting ring 2 320 rotates, it drives the gear 1 520 to rotate, and when the gear 1 520 rotates, it drives the connecting ring 1 220 to rotate in the opposite direction, thereby making the rotation directions of the first flow stabilizing component 200 and the second flow stabilizing component 300 opposite. A connecting hole 221 for the rotation of the limiting component 500 is provided in the middle of the connecting ring 220. The inner walls of the upper and lower ends of the hole cavity of the connecting hole 221 are fixedly installed with limiting ring blocks 223 for cooperating with the limiting component 500 to limit the first flow stabilizing component 200. The limiting ring block 223 rotates in the groove cavity of the limiting ring groove 513, and the hole cavity diameter of the connecting hole 221 is larger than the diameter of the limiting rod 510, so that the inner wall of the connecting hole 221 does not touch the outer wall of the limiting rod 510.

[0034] The airflow stabilizing device 001 includes a second flow stabilizing component 300 for cooperating with the first flow stabilizing component 200 to block the gas. The second flow stabilizing component 300 includes a second baffle 310 for cooperating with the first baffle 210 to block the gas. One side of the second baffle 310 is set as a second arc-shaped groove edge 311, which is convenient for the second baffle 310 to block the gas when it rotates on the rod body of the limiting rod 2 510, thereby preventing the gas from flowing through the gap formed between the second baffle 310 and the limiting rod 2 510. A second connecting ring 320 for limiting the second baffle 310 is fixedly mounted on both the upper and lower ends of one side of the second baffle 310, so that when the second connecting ring 320 rotates, it simultaneously drives the second baffle 310 to rotate. A second tooth block group 322 is fixedly mounted on one end of the second connecting ring 320, which cooperates with the limiting assembly 500 to control the rotation of the first connecting ring 220. The first connecting hole 221 and the second connecting hole 321 are concentric circles with each other, and the first connecting ring 220 is located in the middle of the two second connecting rings 320. Two second connecting rings 320 are provided, and two second baffles 310 are provided. The second connecting ring 320 is located at the upper end of the second baffle 310, and the second tooth block group 322 is located at the lower end of the second connecting ring 320. The second connecting ring 320 is located at the lower end of the second baffle 310, and the second tooth block group 322 is located at the upper end of the second connecting ring 320. The connecting ring 1 220 is located at the upper end of the first baffle 210, and the first tooth block group 222 is set at the upper end of the connecting ring 1 220. The connecting ring 1 220 is located at the lower end of one side of the first baffle 210, and the first tooth block group 222 is set at the lower end of the connecting ring 1 220. The first tooth block group 222 at the upper end of the connecting ring 1 220 and the second tooth block group 322 at the lower end of the connecting ring 2 320 are symmetrically arranged. The first tooth block group 222 at the lower end of the connecting ring 1 220 and the second tooth block group 322 at the upper end of the connecting ring 2 320 are symmetrically arranged.

[0035] A connecting hole 2 321 for the limiting component 500 to rotate is provided in the middle of the connecting ring 2 320. The inner walls of the upper and lower ends of the hole cavity of the connecting hole 2 321 are fixedly installed with limiting ring blocks 2 323 for cooperating with the limiting component 500 to limit the second flow stabilizing component 300. The limiting ring block 2 323 rotates in the groove cavity of the limiting ring groove 1 512. A third tooth block group 324 is fixedly installed in the middle of the cavity of the connecting hole 2 321 for cooperating with the rotating component 600 to control the rotation of the second flow stabilizing component 300, so that when the gas pushes the third flow stabilizing component 400, the third flow stabilizing component 400 drives the limiting rod 1 410 to move, so that the fourth tooth block group 411 drives the rotating component 600 to rotate, and the special-shaped gear 630 and the limiting ring block 2 323 are engaged, driving the connecting ring 2 320 to rotate, and the connecting ring 2 320 drives the gear 1 520 to rotate, and the gear 1 520 drives the connecting ring 1 220 to rotate in the opposite direction, thereby making the second flow stabilizing component 300 and the first flow stabilizing component 200 rotate in opposite directions.

[0036] If the rate at which the gas flows to the third flow stabilizing component 400 is greater than the rate at which the gas flows to the first flow stabilizing component 200 and the second flow stabilizing component 300, the gas will easily push the third flow stabilizing component 400, so that the third flow stabilizing component 400 cooperates with the limiting component 500 and the rotating component 600 to drive the first flow stabilizing component 200 and the second flow stabilizing component 300 to rotate, thereby changing the flow size of the gas. The gas flows under the guidance of the inclined angles of the first flow stabilizing component 200 and the second flow stabilizing component 300, and the airflow stabilizing device 001 is provided with multiple layers. The first flow stabilizing component 200 in the back layer can drive the gas to the second flow stabilizing component 300 in the front layer. 0 is pushed, and the second flow stabilizing component 300 in the latter layer can drive the gas to push the first flow stabilizing component 200 in the former layer. When the gas is not stable, the third flow stabilizing component 400 is pushed deeper, so that the angle between the first flow stabilizing component 200 and the second flow stabilizing component 300 is smaller, driving the gas to flow back, and the returning gas collides with the incoming gas, slowing down the incoming gas. Finally, the setting of the airflow stabilizing device 001 makes the gas flowing to the diverter plate 113 and the returning gas reach a balance, so that the gas flow rate through the ventilation groove cavity is the same, and the measurement of the ultrasonic metering device 112 is more accurate.

[0037] The airflow stabilizing device 001 includes a limiting component 500 for supporting and limiting the first flow stabilizing component 200 and the second flow stabilizing component 300. The limiting component 500 includes a limiting rod 2 510. The upper and lower ends of the limiting rod 2 510 are provided with limiting holes 511 for limiting the limiting rod 1 410, and the limiting rod 1 410 can be extended and retracted in the groove cavity of the limiting hole 511. The upper and lower ends of the limiting rod 2 510 are provided with a limiting ring groove 1 512 for the limiting ring block 2 323 to rotate, and the upper and lower ends of the limiting rod 2 510 are provided with a limiting ring groove 2 513 for the limiting ring block 1 223 to rotate, and the arrangement order of the limiting hole 511, the limiting ring groove 1 512 and the limiting ring groove 2 513 on the rod body of the limiting rod 2 510 is the limiting hole 511, the limiting ring groove 1 512, the limiting ring groove 2 513, the limiting ring groove 2 513, the limiting ring groove 1 512 and the limiting hole 511.

[0038] The upper and lower ends of the rod body of the limiting rod 2 510 are provided with fan-shaped grooves 514 for the rotating assembly 600 to rotate, and the fan-shaped grooves 514 are arranged between adjacent limiting ring grooves 1 512, and the special-shaped gear 630 rotates in the groove cavity of the fan-shaped groove 514, and the special-shaped gear 630 is engaged with the third gear block group 324. The upper and lower ends of the limit rod 2 510 are both equipped with a gear 1 520 for cooperating with the connecting ring 2 320 to control the connecting ring 1 220 to rotate in the opposite direction, and the middle part of the gear 1 520 is hinged with a connecting rod 521 for cooperating with the limit rod 2 510 to limit the gear 1 520, one end of the connecting rod 521 is fixedly mounted on the rod body of the limit rod 2 510, and the upper and lower ends of the rod body of the limit rod 2 510 are fixedly mounted on the upper and lower ends of the groove cavity of the vent 110, and one end of the connecting rod 521 is engaged with the second tooth block group 322, and the other end of the connecting rod 521 is engaged with the first tooth block group 222, and the connecting rod 521 is arranged on the rod body of the limit rod 2 510 between the limiting ring groove 1 512 and the limiting ring groove 2 513, so that when the connecting ring 2 320 rotates, it drives the gear 1 520 to rotate, and when the gear 1 520 rotates, it drives the connecting ring 1 220 to rotate in the opposite direction.

[0039] One end of the limiting assembly 500 is installed with a third flow stabilizing assembly 400 for cooperating with the gas to control the angle change of the first flow stabilizing assembly 200 and the second flow stabilizing assembly 300. The third flow stabilizing assembly 400 includes a limiting rod 410. One end of the limiting rod 410 is fixedly installed with a fourth gear block group 411 for controlling the rotation of the rotating assembly 600. The other end of the limiting rod 410 is installed with a third baffle 420 for cooperating with the gas to control the limiting rod 410 to extend and retract in the inner cavity of the limiting assembly 500. When the limiting rod 410 is extended and retracted, the fourth gear block group 411 drives the gear 2 620 to rotate.

[0040] The interior of the limiting component 500 is equipped with a rotating component 600 for cooperating with the third flow stabilizing component 400 to control the rotation of the second flow stabilizing component 300. The rotating component 600 includes a long rod 610, and the upper and lower ends of the long rod 610 are fixedly equipped with a gear 2 620 for cooperating with the limiting rod 1 410 to control the rotation of the long rod 610. The fourth gear block group 411 is engaged with the gear 2 620. The upper and lower ends of the long rod 610 are equipped with a special-shaped gear 630 for controlling the rotation of the second baffle 310, and the special-shaped gear 630 is engaged with the third gear block group 324, so that when the limiting rod 1 410 controls the gear 2 620 to rotate, it synchronously drives the long rod 610 to rotate, so that the special-shaped gear 630 synchronously drives the second flow stabilizing component 300 to rotate, and the second flow stabilizing component 300 drives the first flow stabilizing component 200 to rotate in the opposite direction to stabilize the flow of gas.

[0041] Based on the above content and the accompanying drawings, those skilled in the art can understand and implement the present invention. In addition, any non-creative modifications made to the present invention by those skilled in the art without making any creative work still fall within the scope of protection of the present invention.

Claims

1. An ultrasonic gas meter based on a split flow metering device, comprising a gas meter housing (100), characterized in that: An air flow stabilizing device (001) for stabilizing the air flow is installed inside the gas meter housing (100): A vent hole (110) for gas flow is provided in the middle of the gas meter housing (100); an ultrasonic metering device (112) for gas metering is installed in the middle of the cavity of the vent hole (110); and a diverter plate (113) for diverting gas is installed at one end of the cavity of the vent hole (110); The airflow stabilizing device (001) comprises a first flow stabilizing component (200) for blocking the gas, and the airflow stabilizing device (001) comprises a second flow stabilizing component (300) for cooperating with the first flow stabilizing component (200) to block the gas; The airflow stabilizing device (001) comprises a limiting component (500) for supporting and limiting the first flow stabilizing component (200) and the second flow stabilizing component (300); a third flow stabilizing component (400) for cooperating with gas to control the angle change of the first flow stabilizing component (200) and the second flow stabilizing component (300) is installed at one end of the limiting component (500); a rotating component (600) for cooperating with the third flow stabilizing component (400) to control the rotation of the second flow stabilizing component (300) is installed inside the limiting component (500).

2. The ultrasonic gas meter based on the split flow metering device according to claim 1, characterized in that: A filter screen (111) for filtering impurities is installed at the gas inlet end of the gas meter housing (100).

3. The ultrasonic gas meter based on the split flow metering device according to claim 1, characterized in that: The first flow stabilizing component (200) comprises a first baffle (210) for blocking the gas, a connecting ring (220) for limiting the first baffle (210) is installed at both upper and lower ends of one side of the first baffle (210), a first tooth block group (222) for cooperating with the limiting component (500) to control the rotation of the first baffle (210) is installed at one end of the connecting ring (220), a connecting hole (221) for allowing the limiting component (500) to rotate is opened in the middle of the connecting ring (220), and a limiting ring block (223) for cooperating with the limiting component (500) to limit the first flow stabilizing component (200) is installed on the inner walls of the upper and lower ends of the hole cavity of the connecting hole (221).

4. The ultrasonic gas meter based on the split flow metering device according to claim 1, characterized in that: The second flow stabilizing component (300) comprises a second baffle (310) for cooperating with the first baffle (210) to block the gas, and a second connecting ring (320) for limiting the second baffle (310) is installed at both upper and lower ends of one side of the second baffle (310), and a second tooth block group (322) for cooperating with the limiting component (500) to control the rotation of the first connecting ring (220) is installed at one end of the second connecting ring (320), and the first connecting hole (221) and the second connecting hole (321) are concentric circles with each other, and the first connecting ring (220) is located in the middle of the two second connecting rings (320).

5. The ultrasonic gas meter based on the split flow metering device according to claim 4 is characterized in that: A second connection hole (321) for the limit assembly (500) to rotate is provided in the middle of the second connection ring (320); a second limit ring block (323) for cooperating with the limit assembly (500) to limit the second flow stabilizing assembly (300) is installed on the inner walls of the upper and lower ends of the hole cavity of the second connection hole (321); and a third tooth block group (324) for cooperating with the rotating assembly (600) to control the rotation of the second flow stabilizing assembly (300) is installed in the middle of the hole cavity of the second connection hole (321).

6. The ultrasonic gas meter based on the split flow metering device according to claim 1, characterized in that: The third flow stabilizing component (400) comprises a limiting rod 1 (410), one end of which is mounted with a fourth gear block group (411) for controlling the rotation of the rotating component (600), and the other end of which is mounted with a third baffle plate (420) for controlling the extension and retraction of the limiting rod 1 (410).

7. The ultrasonic gas meter based on the split flow metering device according to claim 1, characterized in that: The limiting assembly (500) comprises a limiting rod (510), wherein both upper and lower ends of the limiting rod (510) are provided with limiting holes (511) for limiting the limiting rod (410), and both upper and lower ends of the limiting rod (510) are provided with limiting ring grooves (512) for the limiting ring block (323) to rotate. A limiting ring groove 2 (513) is provided for the limiting ring block 1 (223) to rotate, and the limiting hole (511), the limiting ring groove 1 (512) and the limiting ring groove 2 (513) are arranged on the rod body of the limiting rod 2 (510) in the order of limiting hole (511), limiting ring groove 1 (512), limiting ring groove 2 (513), limiting ring groove 2 (513), limiting ring groove 1 (512) and limiting hole (511).

8. The ultrasonic gas meter based on the split flow metering device according to claim 7, characterized in that: The upper and lower ends of the rod body of the second limiting rod (510) are provided with fan-shaped grooves (514) for the rotating assembly (600) to rotate, and the fan-shaped grooves (514) are arranged between adjacent limiting ring grooves (512). The upper and lower ends of the second limiting rod (510) are installed with gears (520) for cooperating with the connecting ring (320) to control the connecting ring (220) to rotate in the opposite direction, and the middle part of the gear (520) is connected with a connecting rod (521) for cooperating with the second limiting rod (510) to limit the gear (520), and one end of the connecting rod (521) is meshed with the second tooth block group (322), and the other end of the connecting rod (521) is meshed with the first tooth block group (222), and the connecting rod (521) is arranged between the limiting ring groove (512) and the limiting ring groove (513).

9. The ultrasonic gas meter based on the split flow metering device according to claim 1, characterized in that: The rotating assembly (600) comprises a long rod (610), and gear 2 (620) for cooperating with limit rod 1 (410) to control the rotation of the long rod (610) is installed at both upper and lower ends of the long rod (610), and special-shaped gears (630) for controlling the rotation of the second baffle (310) are installed at both upper and lower ends of the long rod (610), and the special-shaped gears (630) are meshed with the third gear block group (324).

Images