An ultrasonic gas meter based on split flow metering device

Abstract

The present invention relates to an ultrasonic gas meter based on a flow diversion metering device in the field of gas flow measurement technology of ultrasonic gas meters. An air flow stabilizing device for stabilizing the air flow is installed inside the gas meter housing, a vent hole for gas flow is provided in the middle of the gas meter housing, an ultrasonic metering device for gas metering is installed in the middle of the cavity of the vent hole, and a diverter plate for gas diversion is installed at one end of the cavity of the vent hole. 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, so that the ultrasonic metering device can measure more accurately, and through the setting of the filter, the service life of the present invention is extended.

Description

Technical Field

[0001] The 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 flow splitting 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. Then, the gas flow rate passing through the gas pipeline per unit time is 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. Summary of the invention

[0004] In order to solve the problem raised in the above background technology that the central flow of the gas pipeline is greater than the side wall flow of the pipeline, which is likely to affect the measurement result, the present invention provides the following technical solutions:

[0005] An ultrasonic gas meter based on a split flow metering device comprises a gas meter housing.

[0006] An air flow stabilizing device for stabilizing the air flow is installed inside the gas meter housing.

[0007] A vent hole for gas flow 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, and a diverter plate for diverting gas is installed at one end of the vent hole cavity.

[0008] 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.

[0009] The airflow stabilizing device includes a limiting component for supporting and limiting the first flow stabilizing component and the second flow stabilizing component, one end of the limiting component is equipped with a third flow stabilizing component for cooperating with the gas to control the angle change of the first flow stabilizing component and the second flow stabilizing component, and the interior of the limiting component is equipped with a rotating component for cooperating with the third flow stabilizing component to control the rotation of the second flow stabilizing component.

[0010] Furthermore, a filter screen for filtering impurities is installed at the air inlet end of the gas meter housing.

[0011] 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, a connecting hole 1 for allowing the limiting assembly to rotate 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.

[0012] Furthermore, the second flow stabilizing component includes a second baffle plate for cooperating with the first baffle plate to block the gas, and a connecting ring 2 for limiting the second baffle plate is installed at both upper and lower ends of one side of the second baffle plate, and a second gear block group for cooperating with the limiting component 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.

[0013] Furthermore, a second connecting hole for the rotation of the limiting component is opened in the middle of the connecting ring 2, and the inner walls at the upper and lower ends of the hole cavity of the connecting hole 2 are installed with two limiting ring blocks for cooperating with the limiting component to limit the second flow stabilizing component, and a third gear block group for cooperating with the rotating component to control the rotation of the second flow stabilizing component is installed in the middle of the hole cavity of the connecting hole 2.

[0014] Furthermore, the third flow stabilizing component includes a limiting rod 1, one end of which is equipped with a fourth gear block group for controlling the rotation of the rotating component, and the other end of which is equipped with a third baffle for controlling the extension and retraction of the limiting rod 1.

[0015] Furthermore, the limit assembly includes a limit rod 2, the upper and lower ends of which are provided with limit holes for limiting the limit rod 1, the upper and lower ends of which are provided with a limit ring groove 1 for allowing the limit ring block 2 to rotate, the upper and lower ends of which are provided with a limit ring groove 2 for allowing the limit ring block 1 to rotate, and the limit hole, the limit ring groove 1 and the limit ring groove 2 on the rod body of the limit rod 2 are arranged in the order of limit hole, limit ring groove 1, limit ring groove 2, limit ring groove 2, limit ring groove 1 and limit hole.

[0016] Furthermore, both upper and lower ends of the rod body of the limit rod 2 are provided with fan-shaped grooves for the rotating assembly to rotate, and the fan-shaped grooves are arranged between adjacent limit ring grooves 1, and both upper and lower ends of the limit rod 2 are installed with gear 1 for cooperating with connecting ring 2 to control connecting ring 1 to rotate in the opposite direction, and the middle part of the gear 1 is connected with a connecting rod for cooperating with the limit rod 2 to limit 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 limit ring groove 1 and the limit ring groove 2.

[0017] 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 meshed with the third gear block group.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 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 finally a smooth airflow is formed, so that the ultrasonic metering device can measure more accurately, and through the setting of the filter, the service life of the present invention is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal structure of the ultrasonic gas meter of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the airflow stabilizing device of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the first flow stabilizing component of the present invention;

[0023] Figure 4 is a schematic structural diagram of a second flow stabilizing component of the present invention;

[0024] Figure 5 is a schematic structural diagram of a third flow stabilizing component of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the limit assembly of the present invention;

[0026] Figure 7 It is a schematic structural diagram of the rotating assembly of the present invention.

[0027] In the accompanying drawings, the names of the components represented by the reference numerals are listed as follows:

[0028] 100-Gas meter housing;

[0029] 110-vent, 111-filter, 112-ultrasonic metering device, 113-diverter plate;

[0030] 001-Airflow stabilizing device;

[0031] 200 - first flow stabilizing component, 210 - first baffle, 211 - first arc-shaped groove edge, 220 - first connecting ring, 221 - first connecting hole, 222 - first tooth block group, 223 - first limiting ring block;

[0032] 300 - second flow stabilizing assembly, 310 - second baffle, 311 - second arc-shaped groove edge, 320 - second connecting ring, 321 - second connecting hole, 322 - second tooth block group, 323 - second limiting ring block, 324 - third tooth block group;

[0033] 400 - third flow stabilizing assembly, 410 - limiting rod 1, 411 - fourth gear block group, 420 - third baffle;

[0034] 500-limiting assembly, 510-limiting rod 2, 511-limiting hole, 512-limiting ring groove 1, 513-limiting ring groove 2, 514-sector groove, 520-gear 1, 521-connecting rod;

[0035] 600-rotating assembly, 610-long rod, 620-gear 2, 630-special-shaped gear. DETAILED DESCRIPTION

[0036] The preferred specific embodiments for implementing the present invention are described in detail below, and a clear and complete description is made in conjunction with the accompanying drawings.

[0037] See also Figure 1-Figure 7 The present invention provides an ultrasonic gas meter based on a flow splitting metering device, so that the flow rate of the gas in each ventilation slot cavity remains consistent, thereby improving the metering accuracy of the ultrasonic metering device 112.

[0038] 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 plurality 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, so that the gas flowing to the airflow smoothing device 001, the ultrasonic metering device 112 and the diverter plate 113 is cleaner, and the long-term cleanliness of the surface of the ultrasonic metering device 112 is guaranteed, thereby improving the metering accuracy and extending the service life of the present invention.

[0039] An ultrasonic metering device 112 for ultrasonically metering the gas is fixedly installed in the middle of the cavity of the vent hole 110, and a diverter plate 113 for diverting the gas is installed at one end of the cavity of the vent hole 110. The diverter plate 113 cooperates with the inner wall of the vent hole 110 to form a plurality of vent grooves, and the ultrasonic metering device 112 is located in one of the vent grooves to perform ultrasonic measurement of the gas therein. When the gas enters through the air inlet of the vent hole 110, it is filtered by the filter screen 111, so that the clean gas is stabilized by the air flow stabilizing device 001, so that the gas flowing to the diverter plate 113 is stable, and then the gas flow in the plurality of vent grooves is stable, so that the ultrasonic metering device 112 can measure more accurately.

[0040] 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 plate 210 for blocking the gas. One side of the first baffle plate 210 is set as a first arc-shaped groove edge 211, so that when the first baffle plate 210 rotates on the rod body of the limiting rod 510, the gas can be blocked to prevent the gas from flowing through the gap formed between the first baffle plate 210 and the limiting rod 510. A connecting ring 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 220 rotates, it synchronously drives the first baffle 210 to rotate. One end of the connecting ring 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 220 to rotate in the opposite direction, thereby making the first flow stabilizing component 200 and the second flow stabilizing component 300 rotate in opposite directions. A connecting hole 221 for the limit component 500 to rotate is opened in the middle of the connecting ring 220, and the inner walls at the upper and lower ends of the hole cavity of the connecting hole 221 are fixedly installed with limit ring blocks 223 for cooperating with the limit component 500 to limit the first flow stabilizing component 200. The limit ring block 223 rotates in the groove cavity of the limit ring groove 513, and the hole cavity diameter of the connecting hole 221 is larger than the diameter of the limit rod 510, so that the inner wall of the connecting hole 221 does not touch the outer wall of the limit rod 510.

[0041] 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 plate 310 for cooperating with the first baffle plate 210 to block the gas. One side of the second baffle plate 310 is set as a second arc groove edge 311, so that when the second baffle plate 310 rotates on the rod body of the second limiting rod 510, the gas can be blocked to prevent the gas from flowing through the gap formed between the second baffle plate 310 and the second limiting rod 510. A second connecting ring 320 for limiting the second baffle 310 is fixedly installed at both upper and lower ends of one side of the second baffle 310, so that when the second connecting ring 320 rotates, the second baffle 310 is synchronously driven to rotate, and a second tooth block group 322 for cooperating with the limiting assembly 500 to control the rotation of the first connecting ring 220 is fixedly 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. Two second connecting rings 320 are provided, and two second baffles 310 are provided, the second connecting ring 320 at the upper end of the second baffle 310, the second tooth block group 322 is provided at the lower end of the second connecting ring 320, and the second connecting ring 320 at the lower end of the second baffle 310, the second tooth block group 322 is provided 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 arranged 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 arranged 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.

[0042] A second connecting hole 321 for the limit assembly 500 to rotate is provided in the middle of the second connecting ring 320. The inner walls at the upper and lower ends of the hole cavity of the second connecting hole 321 are fixedly installed with a second limit ring block 323 for cooperating with the limit assembly 500 to limit the second flow stabilizing assembly 300. The second limit ring block 323 rotates in the groove cavity of the limit ring groove 512. A third tooth block group 324 is fixedly installed in the middle of the hole cavity of the second connecting hole 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, so that the rotation directions of the second flow stabilizing component 300 and the first flow stabilizing component 200 are opposite.

[0043] 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 is likely to 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 latter layer can drive the gas to the second flow stabilizing component 300 in the former layer. 0 is pushed, 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 refluxed gas collides with the incoming gas to slow down the incoming gas. Finally, the setting of the airflow stabilizing device 001 makes the gas that finally flows to the diverter plate 113 and the refluxed 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.

[0044] 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 limiting rod 2 510 has limiting holes 511 at both upper and lower ends 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 limit rod 510 are provided with a limit ring groove 512 for the limit ring block 323 to rotate, and the upper and lower ends of the limit rod 510 are provided with a limit ring groove 513 for the limit ring block 223 to rotate, and the limit hole 511, the limit ring groove 512 and the limit ring groove 513 on the rod body of the limit rod 510 are arranged in the order of limit hole 511, limit ring groove 512, limit ring groove 513, limit ring groove 513, limit ring groove 512 and limit hole 511.

[0045] 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 groove 514 is 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 meshed with the third gear block group 324. Gear 1 520 for cooperating with connecting ring 2 320 to control connecting ring 1 220 to rotate in the opposite direction is installed at the upper and lower ends of limiting rod 2 510, and a connecting rod 521 for cooperating with limiting rod 2 510 to limit gear 1 520 is hinged in the middle part of gear 1 520, one end of connecting rod 521 is fixedly installed on the rod body of limiting rod 2 510, and the upper and lower ends of the rod body of limiting rod 2 510 are fixedly installed on the upper and lower ends of the groove cavity of vent 110, and one end of connecting rod 521 is meshed with the second tooth block group 322, and the other end of connecting rod 521 is meshed with the first tooth block group 222, and connecting rod 521 is arranged on the rod body of limiting rod 2 510 between limiting ring groove 1 512 and limiting ring groove 2 513, so that when connecting ring 2 320 rotates, gear 1 520 is driven to rotate, and when gear 1 520 rotates, connecting ring 1 220 is driven to rotate in the opposite direction.

[0046] A third flow stabilizing component 400 is installed at one end of the limit assembly 500 for cooperating with the gas to control the angle change of the first flow stabilizing component 200 and the second flow stabilizing component 300. The third flow stabilizing component 400 includes a limit rod 410, and a fourth gear block group 411 for controlling the rotation of the rotating component 600 is fixedly installed at one end of the limit rod 410. A third baffle 420 is installed at the other end of the limit rod 410 for cooperating with the gas to control the limit rod 410 to extend and retract in the inner cavity of the limit assembly 500. When the limit rod 410 is extended and retracted, the fourth gear block group 411 drives the gear 2 620 to rotate.

[0047] A rotating assembly 600 is installed inside the limit assembly 500 for cooperating with the third flow stabilizing assembly 400 to control the second flow stabilizing assembly 300 to rotate. The rotating assembly 600 includes a long rod 610, and the upper and lower ends of the long rod 610 are fixedly installed with a gear 2 620 for cooperating with the limit rod 1 410 to control the long rod 610 to rotate. The fourth tooth block group 411 is meshed with the gear 2 620. The upper and lower ends of the long rod 610 are installed with a special-shaped gear 630 for controlling the second baffle 310 to rotate, and the special-shaped gear 630 is meshed with the third tooth block group 324, so that when the limit rod 1 410 controls the gear 2 620 to rotate, the long rod 610 is synchronously driven to rotate, so that the special-shaped gear 630 synchronously drives the second flow stabilizing assembly 300 to rotate, and the second flow stabilizing assembly 300 drives the first flow stabilizing assembly 200 to rotate in the opposite direction to stabilize the flow of gas.

[0048] 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 creative work still fall within the protection scope 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 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), and a first gear 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); The second flow stabilizing component (300) comprises a second baffle (310) for cooperating with the first baffle (210) to block the gas; 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); a second tooth block group (322) for cooperating with the limiting component (500) to control the rotation of the connecting ring (220) is installed at one end of the connecting ring (320); 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) is installed at one end of the position limiting component (500) for cooperating with the gas to control the angle change of the first flow stabilizing component (200) and the second flow stabilizing component (300); 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 pushes the third flow stabilizing component (400), so that the third flow stabilizing component (400) cooperates with the position 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; A rotating component (600) is installed inside the position-limiting component (500) and is used to cooperate with the third flow-stabilizing component (400) to control the second flow-stabilizing component (300) to rotate.

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: A connecting hole (221) for the limit assembly (500) to rotate is provided in the middle of the connecting ring (220), and a limit ring block (223) for cooperating with the limit assembly (500) to limit the first flow stabilizing assembly (200) is installed on the inner walls of the upper and lower ends of the 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: A second connection hole (321) for the limit assembly (500) to rotate is provided in the middle of the second connection ring (320), and the first connection hole (221) and the second connection hole (321) are concentric circles with each other, and the first connection ring (220) is located in the middle of the two second connection rings (320).

5. The ultrasonic gas meter based on the split flow metering device according to claim 4 is characterized in that: The inner walls at both ends of the cavity of the second connecting hole (321) are both provided with a second limiting ring block (323) for cooperating with the limiting component (500) to limit the second flow stabilizing component (300), and the middle part of the cavity of the second connecting hole (321) is provided with a third tooth block group (324) for cooperating with the rotating component (600) to control the rotation of the second flow stabilizing component (300).

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), 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).

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