Ultrasonic and diaphragm combined metering gas meter

Abstract

This invention discloses an ultrasonic and diaphragm composite gas meter, which relates to the field of gas meter technology. By relying on the linkage reset mechanism of the gas follow-up component and the anti-backflow component, when the gas flow is shut off, the flow rate returns to zero, or a backflow trend occurs, the movable baffle can be quickly reset to a closed state where the second arc-shaped gas channel and the first arc-shaped gas channel are completely misaligned. This effectively blocks the reverse flow of gas, preventing backflow gas from carrying impurities and condensate to contaminate the diaphragm metering membrane and corrode the ultrasonic metering sensor, ensuring the long-term stable operation of the dual metering system. Simultaneously, the entire system adopts a purely mechanical structure with no easily damaged electronic drive components, resulting in a low failure rate and high durability. Through the integrated design of voltage stabilization, anti-backflow, filtration, and self-cleaning, it minimizes the interference and damage to the metering mechanism caused by gas fluctuations, impurity erosion, and backflow impacts, enabling the ultrasonic and diaphragm metering systems to maintain high-precision operation over a long period.

Description

Technical Field

[0001] This invention relates to the field of gas meter technology, specifically to an ultrasonic and diaphragm composite gas meter. Background Technology

[0002] The ultrasonic and diaphragm composite gas meter is a new type of smart gas meter that integrates traditional diaphragm mechanical metering and modern ultrasonic electronic metering technologies. It combines the core advantages of both technologies through a dual-path parallel metering system of "mechanical base meter + electronic metering," achieving highly reliable, high-precision, wide-range, and long-life smart gas metering.

[0003] The security-type wireless smart gas meter disclosed in the patent application with publication number CN102393232A is simple in structure and easy to use. It can prevent gas safety accidents in the event of an earthquake or gas leak, thus protecting people's lives and property. The gas meters described above have the following drawbacks in practical use: 1) When the pipeline pressure fluctuates abnormally, downstream gas-using equipment shuts down, or the pipeline is under maintenance, gas backflow is very likely to occur. Backflowing gas not only causes metering data disorder, leading to metering inaccuracies and increased supply-demand discrepancies, but may also carry impurities and condensate from the pipeline back into the meter body, contaminating the diaphragm of the diaphragm metering mechanism and corroding the ultrasonic metering sensor, resulting in decreased metering accuracy and shortened meter body lifespan; 2) When users turn on or switch between gas appliances with different power ratings, the gas flow rate will change significantly in a short period of time. Fluctuations in pipeline pressure will also directly lead to unstable gas flow. Traditional gas valves are mostly fixed-diameter structures or only have simple on / off functions. They cannot adjust the gas inlet opening in real time according to changes in flow rate, making it difficult to maintain a stable airflow into the gas meter. This can easily lead to impact airflow when the flow rate increases suddenly, causing metering errors and overload of internal components. When the flow rate is too low, problems such as poor gas intake and missed meter readings may occur.

[0004] Therefore, this invention proposes an ultrasonic and diaphragm composite gas meter to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a composite ultrasonic and diaphragm gas meter, which solves the problems of traditional gas meters being prone to backflow of gas during pipeline pressure fluctuations, gas appliance shutdowns, or pipeline maintenance. This backflow causes metering irregularities, inaccuracies, and increased supply-demand discrepancies. Furthermore, it can carry impurities and condensate, damaging internal components and reducing metering accuracy and lifespan. Additionally, users switching gas appliances can cause sudden changes in flow rate, and traditional gas valves cannot adaptively adjust their opening, easily leading to metering errors, missed readings, or component overload.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ultrasonic and diaphragm composite gas meter, comprising a gas meter body and a gas inlet and a gas outlet fixedly disposed on both sides of the top of the gas meter body, wherein a gas control mechanism is detachably disposed on the top of the gas outlet, and the gas control mechanism includes: The first gas pipe is fixedly installed on the top of the gas outlet by bolts, and a second gas pipe communicating with the interior is fixedly installed on the side wall of the first gas pipe. The anti-backflow component is installed inside the second gas pipe. It is used to automatically adjust the cross-sectional area of ​​the gas passage according to the gas flow rate to stabilize the gas pressure inside the gas meter body, while intercepting particulate impurities in the gas and using the gas driving force to switch the filtration area to achieve continuous and efficient impurity removal. The gas follow-up component is installed inside the first gas pipe via a support frame and works in conjunction with the anti-backflow component. The gas follow-up component adjusts its rotation speed according to the gas flow rate. By using the magnitude of centrifugal force in relation to the opening of the gas passage of the anti-backflow component, the gas pressure inside the gas meter body is automatically and stably adjusted.

[0007] Furthermore, a bypass pipe is fixedly connected between the first gas pipe and the second gas pipe to connect their internal cavities; one end of the bypass pipe connected to the second gas pipe is located on the left side of the anti-backflow component, and a control valve for controlling the opening and closing of the channel is fixedly installed inside the bypass pipe, and a filter screen for filtering the gas output from the bypass pipe is fixedly installed inside the first gas pipe.

[0008] Furthermore, the gas-driven follow-up assembly includes a long rotating shaft, with an impeller and a first bearing sleeve fixedly mounted at the bottom and top of the long rotating shaft, respectively. A second bearing sleeve is slidably mounted on the outer wall of the long rotating shaft. A spring limiting ring is fixedly mounted on the outer wall of the long rotating shaft between the first and second bearing sleeves. A spring is slidably mounted on the outer wall of the long rotating shaft between the second bearing sleeve and the spring limiting ring. Swing arms are symmetrically and rotatably mounted on both sides of the outer wall of the first bearing sleeve. A counterweight ball is fixedly mounted at the bottom of the swing arm. A connecting rod is rotatably mounted between the swing arm and the second bearing sleeve. A lifting rod is rotatably mounted on the outer wall of the second bearing sleeve.

[0009] Furthermore, the anti-backflow component includes a drive shaft and a gear fixedly disposed at one end of the drive shaft. A flow control component and a filter component are respectively sleeved on both sides of the outer wall of the drive shaft, and the outer wall of the filter component is detachably provided with a drive component. The flow control component includes a fixed partition plate fixedly disposed on the inner wall of the second gas pipe. The fixed partition plate has a movable cavity inside. The front of the movable cavity has a first arc-shaped gas passage. The movable cavity has a sealed and rotatable movable baffle plate inside. The movable baffle plate is coaxially arranged with the fixed partition plate. The outer wall of the movable baffle plate has a second arc-shaped gas passage plate adapted to the structure of the first arc-shaped gas passage plate.

[0010] Furthermore, the filter assembly includes an annular frame fixedly disposed on the outer wall of the fixed partition. An annular groove is provided inside the annular frame, and a circular filter plate is rotatably disposed inside the annular groove. An installation through hole is provided at the center of the circular filter plate, and a unidirectional rotation control component is provided inside the installation through hole to restrict the unidirectional rotation of the circular filter plate.

[0011] Furthermore, the unidirectional rotation control component includes an outer ring fixedly disposed inside the mounting through hole. Protective covers are detachably disposed at both ends of the outer ring. Multiple limiting grooves are evenly distributed on the inner wall of the outer ring. An inner ring is coaxially rotatably disposed inside the outer ring. Multiple receiving grooves are evenly distributed on the outer circumference of the inner ring. A limiting block is rotatably disposed inside the receiving groove via a rotating shaft. A metal spring is fixedly disposed inside the receiving groove. The metal spring pushes the limiting block into the limiting groove, so that the inner ring can only rotate in one direction.

[0012] Furthermore, the transmission assembly includes an end cap fixedly mounted on the outer wall of the annular frame. The outer wall of the end cap has a ventilation notch corresponding to the position of the second arc-shaped gas passage. Multiple cleaning brushes are fixedly mounted on the side wall of the ventilation notch near the circular filter plate to remove impurities adhering to the surface of the circular filter plate. A transmission box is fixedly mounted on the outer wall of the end cap away from the filter assembly. A drive rack that meshes with a gear is slidably mounted inside the transmission box. An avoidance through hole is provided on the top of the transmission box for the drive rack to pass through.

[0013] Furthermore, the bottom end of the drive rack is fixedly connected to the lifting rod. Only when the drive rack moves upward and drives the gear to rotate, the limiting block is blocked by the limiting groove and drives the protective cover to rotate synchronously. When the drive rack moves downward, the limiting block is pushed into the receiving groove by the inner wall of the outer ring, and the inner ring and the outer ring rotate relative to each other.

[0014] Furthermore, when the gas flow rate changes from low to high, the gas follow-up component drives the anti-backflow component through centrifugal force to achieve synchronous linkage between the gas channel opening and the filter switching action. When the gas is turned off and the flow rate is zero, the anti-backflow component automatically resets to the fully closed filter position, forming a triple self-locking protection of anti-backflow, pressure stabilization, and self-cleaning.

[0015] Furthermore, the lifting stroke of the drive rack is uniquely matched with the rotation angle of the circular filter plate and the cleaning trajectory of the cleaning brush, so that the gas meter maintains a stable working state with no filter blockage, no accumulation of impurities in the channel, and no disturbance in metering in any flow range.

[0016] This invention provides a composite gas meter combining ultrasonic and diaphragm technology. Compared with existing technologies, it has the following advantages: 1. An ultrasonic and diaphragm composite gas meter, which, by relying on the linkage reset mechanism of the gas follow-up component and the anti-backflow component, can quickly reset the movable baffle to a closed state where the second arc-shaped gas channel and the first arc-shaped gas channel are completely misaligned when the gas is shut off, the flow rate is zero, or a backflow trend occurs. This effectively blocks the reverse flow of gas, prevents backflowing gas from carrying impurities and condensate to contaminate the diaphragm metering membrane, and avoids corrosion of the ultrasonic metering sensor. It completely eliminates the hidden dangers of metering inaccuracy and increased supply-demand difference, and ensures the long-term stable operation of the dual metering system.

[0017] 2. An ultrasonic and diaphragm composite gas meter, which uses the kinetic energy of gas flow as the sole driving source through a gas follower component, requires no electronic control unit, external power or complex control mechanism. The impeller speed changes in real time with the gas flow rate, and the counterweight ball drives the rack to rise and fall in linkage with the magnitude of centrifugal force, which precisely controls the channel opening of the flow control component. This avoids the impact airflow caused by a sudden increase in flow, which could lead to metering errors and component overload. It also prevents poor air intake and missed metering when the flow is too low, allowing the gas meter to maintain a stable working state over a wide flow range.

[0018] 3. An ultrasonic and diaphragm composite gas meter, which adopts a circular filter plate filtration structure, can comprehensively intercept large particulate impurities, dust, rust and other pollutants in the gas, preventing impurities from entering the core metering area of ​​the meter body. At the same time, with the help of a unidirectional rotation control component and a cleaning brush, the circular filter plate rotates synchronously in one direction during the flow regulation process. The cleaning brush scrapes off the impurities attached to the surface of the filter plate in real time, automatically switching the filtration area to avoid local blockage and keep the filter surface unobstructed for a long time. It does not require frequent manual disassembly and cleaning, which greatly reduces maintenance costs and ease of use.

[0019] 4. An ultrasonic and diaphragm composite gas meter, which can quickly open the gas path when the gas is turned on through a bypass pipe and a normally closed one-way control valve, ensuring the smooth start of the gas follow-up component; and can also serve as an emergency passage when the anti-backflow component is blocked or under maintenance, ensuring a continuous and stable gas supply; and after the gas is turned off, the overall structure automatically resets to the fully closed filter position, forming a triple self-locking protection of anti-backflow, pressure stabilization and self-cleaning, which greatly improves the safety and reliability of the gas meter operation.

[0020] 5. A composite gas meter combining ultrasonic and diaphragm metering. This patent adopts a purely mechanical structure with no easily damaged electronic drive components, resulting in a low failure rate and high durability. Through an integrated design of pressure stabilization, backflow prevention, filtration, and self-cleaning, it minimizes the interference and damage to the metering mechanism caused by gas fluctuations, impurity erosion, and backflow impact. This ensures that ultrasonic and diaphragm metering maintain high-precision operation over a long period without performance degradation or metering deviation. It fully integrates the dual advantages of the high reliability of traditional diaphragm meters and the high precision of ultrasonic meters, making it suitable for complex pipeline environments and diverse user gas usage scenarios.

[0021] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art based on the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the decomposed state structure of the present invention; Figure 3 This is a first cross-sectional view of the gas control mechanism of the present invention; Figure 4 This is a second cross-sectional view of the gas control mechanism of the present invention; Figure 5 For the present invention Figure 4 A magnified structural diagram of part A in the diagram; Figure 6 This is a schematic diagram of the assembly state structure of the anti-backflow component and the gas follow-up component of the present invention; Figure 7 This is a schematic diagram of the gas servo component structure of the present invention; Figure 8 This is a schematic diagram of the first disassembled state structure of the anti-backflow component of the present invention; Figure 9 This is a schematic diagram of the first cross-sectional structure of the anti-backflow component of the present invention; Figure 10 This is a schematic diagram of the second disassembled state structure of the anti-backflow component of the present invention; Figure 11 This is a schematic diagram of the third disassembled state structure of the anti-backflow component of the present invention; Figure 12 This is a schematic diagram of the decomposed state structure of the flow control component of the present invention; Figure 13 This is a schematic diagram of the decomposed state structure of the filter component of the present invention; Figure 14 This is a schematic diagram of the unidirectional rotation control component structure of the present invention; Figure 15 For the present invention Figure 14 A magnified structural diagram of part B in the diagram; Figure 16 This is a schematic diagram of the second cross-sectional structure of the anti-backflow component of the present invention; Figure 17 For the present invention Figure 16 A magnified structural diagram of part C in the diagram.

[0023] In the diagram: 1. Gas meter body; 2. Gas inlet; 3. Gas outlet; 4. Gas control mechanism; 41. First gas pipe; 42. Second gas pipe; 43. Anti-backflow assembly; 431. Drive shaft; 432. Gear; 433. Flow control assembly; 4331. Fixed partition; 4332. Movable chamber; 4333. First arc-shaped gas passage; 4334. Movable baffle; 4335. Second arc-shaped gas passage; 434. Filter assembly; 4341. Ring frame; 4342. Annular groove; 4343. Circular filter plate; 4344. Mounting through hole; 4345. One-way rotation control assembly; 4346. Outer ring; 4347. Protective cover; 4348. Limiting... 4349. Groove; 43410. Inner ring; 43411. Receiving groove; 43411. Limiting block; 43412. Metal spring; 435. Transmission assembly; 4351. End cap; 4352. Vent notch; 4353. Cleaning brush strip; 4354. Transmission box; 4355. Drive rack; 4356. Clearance through hole; 44. Gas follow-up assembly; 441. Long rotating shaft; 442. Impeller; 443. First bearing sleeve; 444. Second bearing sleeve; 445. Spring limiting ring; 446. Spring; 447. Swing arm; 448. Counterweight ball; 449. Connecting rod; 4410. Lifting rod; 45. Bearing frame; 46. Bypass pipe; 47. Control valve; 48. Filter screen. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] This invention provides three technical solutions: an ultrasonic and diaphragm composite gas meter, specifically including the following embodiments: like Figures 1-6The first embodiment is shown: an ultrasonic and diaphragm composite gas meter, including a gas meter body 1 and a gas inlet 2 and a gas outlet 3 fixedly disposed on both sides of the top of the gas meter body 1. A gas control mechanism 4 is detachably disposed on the top of the gas outlet 3. The gas control mechanism 4 includes: The first gas pipe 41 is fixedly installed on the top of the gas outlet 3 by bolts, and a second gas pipe 42 communicating with the interior is fixedly installed on the side wall of the first gas pipe 41. The anti-backflow component 43 is installed inside the second gas pipe 42. It is used to automatically adjust the cross-sectional area of ​​the gas passage according to the gas flow rate to stabilize the gas pressure inside the gas meter body 1, while intercepting particulate impurities in the gas and using the gas driving force to switch the filtration area to achieve continuous and efficient impurity removal. The gas follower component 44 is installed inside the first gas pipe 41 through the support frame 45 and works in conjunction with the anti-backflow component 43. The gas follower component 44 adjusts its rotation speed according to the change of gas flow rate. By using the magnitude of centrifugal force and the gas passage opening of the anti-backflow component 43, the gas pressure inside the gas meter body 1 is automatically and stably adjusted.

[0026] In this embodiment, the gas inlet 2 is used to supply gas from the external gas pipeline network to the gas meter body 1, and the gas outlet 3 is used to deliver the metered gas to the user end; the gas control mechanism 4 is detachable for easy maintenance, cleaning and replacement; the first gas pipe 41 and the second gas pipe 42 form a dual-path layout of the main gas supply branch and the regulating branch; the anti-backflow component 43 has three functions: flow regulation, impurity filtration and anti-backflow, without the need for an additional drive source; the gas follow-up component 44 uses the kinetic energy of gas flow as the sole power source to achieve pure mechanical adaptive adjustment without electrical control or spring forced reset.

[0027] In this embodiment, a bypass pipe 46 is fixedly connected between the first gas pipe 41 and the second gas pipe 42 to connect their internal cavities; one end of the bypass pipe 46 connected to the second gas pipe 42 is located on the left side of the anti-backflow component 43; a control valve 47 for controlling the opening and closing of the channel is fixedly installed inside the bypass pipe 46; and a filter screen 48 for filtering the gas output from the bypass pipe 46 is fixedly installed inside the first gas pipe 41.

[0028] In this embodiment, the bypass pipe 46 serves as an emergency and pressure-stabilizing auxiliary passage. It can be temporarily opened when the anti-backflow component 43 is blocked or under maintenance. Simultaneously, it is used to maintain unobstructed gas flow when gas is first introduced, allowing the gas follow-up component 44 to start smoothly. The control valve 47 is a normally closed one-way valve, passively opening only when the internal pressure of the gas meter body 1 is abnormally low, preventing negative pressure gas intake. The filter screen 48 has a coarse filter structure, used to intercept large particulate impurities, preventing them from entering the bypass pipe and causing blockage, forming a two-stage filtration protection with the anti-backflow component 43.

[0029] like Figure 7 The second embodiment is shown. The gas follower assembly 44 includes a long rotating shaft 441. An impeller 442 and a first bearing sleeve 443 are fixedly installed at the bottom and top of the long rotating shaft 441, respectively. A second bearing sleeve 444 is slidably sleeved on the outer wall of the long rotating shaft 441. A spring limiting ring 445 is fixedly sleeved on the outer wall of the long rotating shaft 441 between the first bearing sleeve 443 and the second bearing sleeve 444. A spring 446 is slidably sleeved on the outer wall of the long rotating shaft 441 between the second bearing sleeve 444 and the spring limiting ring 445. Swing arms 447 are symmetrically rotatably installed on both sides of the outer wall of the first bearing sleeve 443. A counterweight ball 448 is fixedly installed at the bottom of the swing arm 447. A connecting rod 449 is rotatably installed between the swing arm 447 and the second bearing sleeve 444. A lifting rod 4410 is rotatably sleeved on the outer wall of the second bearing sleeve 444.

[0030] In this embodiment, the impeller 442 is directly driven by the gas flow to rotate the long shaft 441, and the rotation speed is proportional to the gas flow rate. The counterweight ball 448 generates centrifugal force and swings outward as the rotation speed increases, pushing the second bearing sleeve 444 to move axially along the long shaft 441 through the connecting rod 449. The spring 446 is used to provide a reset preload force, pushing the second bearing sleeve 444 to fall back when the gas flow rate decreases. The lifting rod 4410 rises and falls synchronously with the second bearing sleeve 444, converting the rotational centrifugal force into a linear driving force, realizing mechanical linkage with the anti-backflow component 43.

[0031] like Figures 8-17 The third embodiment is shown. The anti-backflow component 43 includes a drive shaft 431 and a gear 432 fixedly disposed at one end of the drive shaft 431. A flow control component 433 and a filter component 434 are respectively sleeved on both sides of the outer wall of the drive shaft 431. A drive component 435 is detachably disposed on the outer wall of the filter component 434. The flow control component 433 includes a fixed partition 4331 fixedly disposed on the inner wall of the second gas pipe 42. A movable cavity 4332 is opened inside the fixed partition 4331. A first arc-shaped gas passage 4333 is opened on the front of the movable cavity 4332. A movable baffle 4334 is rotatably disposed inside the movable cavity 4332. The movable baffle 4334 is coaxially arranged with the fixed partition 4331. A second arc-shaped gas passage 4335 adapted to the structure of the first arc-shaped gas passage 4333 is opened on the outer wall of the movable baffle 4334.

[0032] In this embodiment, when the drive rack 4355 is in the initial lowest position, the second arc-shaped gas channel 4335 and the movable cavity 4332 are misaligned. When the drive rack 4355 moves upward, the second arc-shaped gas channel 4335 and the first arc-shaped gas channel 4333 gradually overlap. When the counterweight ball 448 is in a horizontal state under the action of centrifugal force, the second arc-shaped gas channel 4335 and the first arc-shaped gas channel 4333 completely overlap.

[0033] In this embodiment, the flow control component 433 is the core of gas on / off and opening degree adjustment. The fixed partition 4331 is sealed and fixed to the inner wall of the second gas pipe 42 to prevent gas leakage. The movable baffle 4334 can rotate in a sealed manner within the movable cavity 4332, changing the gas flow rate by the overlapping area of ​​the second arc-shaped gas channel 4335 and the first arc-shaped gas channel 4333. The gear 432 meshes with the transmission component 435 to convert linear motion into rotational motion, realizing the precise drive of the flow control component 433. When the channels are completely overlapped, it is the maximum gas flow state; when they are misaligned, it is the minimum flow limit or cut-off state, taking into account both pressure stabilization and backflow prevention.

[0034] In this embodiment, the filter assembly 434 includes an annular frame 4341 fixedly disposed on the outer wall of the fixed partition 4331. An annular groove 4342 is formed inside the annular frame 4341, and a circular filter plate 4343 is rotatably and sealed inside the annular groove 4342. A mounting through hole 4344 is formed at the center of the circular filter plate 4343, and a one-way rotation control assembly 4345 is disposed inside the mounting through hole 4344 to restrict the one-way rotation of the circular filter plate 4343. The circular filter plate 4343 has a microporous filtration structure, used to intercept small particulate impurities such as dust and rust in the gas. The annular groove 4342 provides radial limiting and sealing support for the circular filter plate 4343, ensuring smooth rotation and no gas leakage. The one-way rotation control assembly 4345 allows the circular filter plate 4343 to rotate only in one direction, preventing reverse rotation that could cause impurities to fall off. It also works in conjunction with a cleaning structure to achieve cyclic switching of the filter surface.

[0035] In this embodiment, the unidirectional rotation control component 4345 includes an outer ring 4346 fixedly disposed inside the mounting through hole 4344. Protective covers 4347 are detachably disposed at both ends of the outer ring 4346. Multiple limiting grooves 4348 are evenly provided on the inner wall of the outer ring 4346. An inner ring 4349 is coaxially rotatably disposed inside the outer ring 4346. Multiple receiving grooves 43410 are evenly provided on the outer circumferential surface of the inner ring 4349. A limiting block 43411 is rotatably disposed inside the receiving groove 43410 via a rotating shaft. A metal spring piece 43412 is fixedly disposed inside the receiving groove 43410. The metal spring piece 43412 pushes the limiting block 43411 into the limiting groove 4348, so that the inner ring 4349 can only rotate in one direction.

[0036] In this embodiment, the transmission assembly 435 includes an end cap 4351 fixedly disposed on the outer wall of the ring frame 4341. The outer wall of the end cap 4351 is provided with a ventilation notch 4352 corresponding to the position of the second arc-shaped gas passage 4335. A plurality of cleaning brush strips 4353 are fixedly disposed on the side wall of the ventilation notch 4352 near the circular filter plate 4343 for removing impurities attached to the surface of the circular filter plate 4343. A transmission box 4354 is fixedly disposed on the outer wall of the end cap 4351 away from the filter assembly 434. A drive rack 4355 that meshes with the gear 432 is slidably disposed inside the transmission box 4354. A clearance through hole 4356 is provided on the top of the transmission box 4354 for the drive rack 4355 to pass through.

[0037] In this embodiment, the outer ring 4346 is fixed and rotates synchronously with the circular filter plate 4343, and the inner ring 4349 is fixedly connected to the drive shaft 431. The limiting block 43411 is engaged in the limiting groove 4348 under the action of the metal spring 43412, realizing forward rotation locking and reverse rotation unlocking. When rotating forward, it drives the circular filter plate 4343 to rotate synchronously and switch the filter surface. When rotating in reverse, the inner ring 4349 rotates freely and does not drive the circular filter plate 4343, thus avoiding repeated contamination of the filter surface.

[0038] In this embodiment, the bottom end of the drive rack 4355 is fixedly connected to the lifting rod 4410. Only when the drive rack 4355 moves upward and drives the gear 432 to rotate, the limiting block 43411 is blocked by the limiting groove 4348 and drives the protective cover 4347 to rotate synchronously. When the drive rack 4355 moves downward, the limiting block 43411 is pushed into the receiving groove 43410 by the inner wall of the outer ring 4346, and the inner ring 4349 rotates relative to the outer ring 4346. The ventilation notch 4352 is aligned with the gas passage of the flow control component 433 to ensure smooth gas flow; the cleaning brush 4353 makes elastic contact with the surface of the circular filter plate 4343, scraping off attached impurities as the circular filter plate 4343 rotates, achieving self-cleaning; the drive rack 4355 makes linear reciprocating motion in the transmission box 4354, and the avoidance hole 4356 provides movement avoidance space for the drive rack 4355 to prevent movement interference; the end cap 4351 forms a sealed protection for the filter component 434 to prevent impurities from entering the internal structure.

[0039] In this embodiment, when the gas flow rate changes from low to high, the gas follower component 44 drives the anti-backflow component 43 through centrifugal force to achieve synchronous linkage between the gas channel opening and the filter switching action. When the gas is turned off and the flow rate is zero, the anti-backflow component 43 automatically resets to the fully closed filter position, forming a triple self-locking protection of anti-backflow, pressure stabilization and self-cleaning.

[0040] In this embodiment, the lifting stroke of the drive rack 4355 and the rotation angle of the circular filter plate 4343 and the cleaning trajectory of the cleaning brush 4353 form a unique corresponding matching relationship, so that the gas meter can maintain a stable working state with no filter surface blockage, no channel accumulation, and no metering disturbance in any flow range.

[0041] In use, initially, there is no gas flow in the gas meter body 1, and both the gas inlet 2 and the gas outlet 3 are in a static standby mode. In the gas follow-up assembly 44, the impeller 442 is stationary and does not rotate, the long rotating shaft 441 does not rotate, the counterweight ball 448 hangs down naturally under its own weight and the preload of the spring 446, the second bearing sleeve 444 is located at the lower end of the long rotating shaft 441, and the lifting rod 4410 is kept at the lowest position; in the anti-backflow assembly 43, the drive rack 4355 is at the lowest position with the lifting rod 4410, the gear 432 and the transmission shaft 431 do not rotate, the second arc-shaped gas passage 4335 of the movable baffle 4334 in the flow control assembly 433 is completely misaligned with the first arc-shaped gas passage 4333 of the fixed baffle 4331, the gas passage is in a closed state, the circular filter plate 4343 of the filter assembly 434 is stationary, and the one-way rotation control assembly 4345 is in a locked standby state; the control valve 47 inside the bypass pipe 46 remains normally closed, and the filter screen 48 is in a standby filtration state.

[0042] When the gas is turned on, external gas enters the gas meter body 1 through the gas inlet 2 for metering, and then flows into the first gas pipe 41 of the gas control mechanism 4 through the gas outlet 3. Then, the control valve 47 is opened to connect the first gas pipe 41 and the second gas pipe 42, so that the gas follower component 44 is in the gas flow path. A small amount of gas enters the second gas pipe 42 through the bypass pipe 46, after being coarsely filtered by the control valve 47 and the filter screen 48, providing initial driving force for the gas follower component 44. The airflow continuously impacts the impeller 442, causing the long rotating shaft 441 and the first bearing sleeve 443 to rotate synchronously. The centrifugal force generated by the rotation causes the counterweight ball 448 to swing outward. Through the swing arm 447 and the connecting rod 449, the second bearing sleeve 444 is pushed to slide upward along the long rotating shaft 441. While compressing the spring 446, the lifting rod 4410 is moved upward, which in turn pushes the drive rack 4355 to slide upward along the transmission box 4354. The drive gear 432 rotates and drives the transmission shaft 431 to rotate synchronously. After 5-10 seconds, the control valve 47 is closed, allowing gas to enter the second gas pipe 42 through the anti-backflow component 43 from the first gas pipe 41. During this process, gas continues to flow in the gas meter body 1.

[0043] As the gas flow rate changes continuously, the gas follow-up component 44 achieves adaptive flow regulation: the higher the gas flow rate, the higher the speed of the impeller 442 and the long rotating shaft 441, the greater the centrifugal force on the counterweight ball 448 and the greater the swing amplitude, the greater the upward stroke of the second bearing sleeve 444 and the lifting rod 4410, the greater the rotation angle of the drive rack 4355 driving the gear 432 and the transmission shaft 431, and the rotational displacement of the movable baffle 4334 in the movable cavity 4332 increases accordingly. The overlapping area of ​​the second arc-shaped gas channel 4335 and the first arc-shaped gas channel 4333 gradually increases, and the gas flow rate is adaptively increased. When the counterweight ball 448 reaches a horizontal state under the action of centrifugal force, the two arc-shaped gas channels completely overlap, and the gas flow reaches the maximum value, thereby stabilizing the internal pressure of the gas meter body 1 and avoiding inaccurate measurement caused by flow rate fluctuations.

[0044] While regulating the flow rate, the filtration and self-cleaning functions operate simultaneously: after the gas flows through the flow control component 433, it passes through the circular filter plate 4343 of the filter component 434, effectively intercepting small impurities such as dust and rust; when the drive shaft 431 rotates in the forward direction, it drives the inner ring 4349 to rotate synchronously, and the limiting block 43411, supported by the metal spring piece 43412, engages with the limiting groove 4348 on the inner wall of the outer ring 4346, locking the inner ring 4349 and the outer ring 4346 to rotate synchronously, thereby driving the protective cover 4347 and the circular filter plate 4343 to rotate synchronously. Unidirectional rotation; during the rotation of the circular filter plate 4343, the cleaning brush 4353 of the transmission component 435 is in close contact with its surface, continuously scraping off the attached impurities to achieve self-cleaning of the filter surface. At the same time, the unidirectional rotation of the circular filter plate 4343 switches the filtration area to avoid local blockage. When the drive rack 4355 moves downward to reset and the transmission shaft 431 rotates in the opposite direction, the limit block 43411 is squeezed into the receiving groove 43410 by the inner wall of the outer ring 4346, the inner ring 4349 rotates freely, and the circular filter plate 4343 remains stationary to prevent impurities from falling off and causing secondary pollution.

[0045] When the gas supply is shut off or the gas meter body 1 is idle for a long time, the airflow disappears and the flow rate returns to zero. The impeller 442 stops rotating, and the spring 446 fully rebounds and resets, causing the second bearing sleeve 444, the lifting rod 4410, and the drive rack 4355 to fall back to their initial positions. The gear 432, the transmission shaft 431, and the movable baffle 4334 reset synchronously, and the gas passage is resealed. The one-way rotation control component 4345 rotates idling, the circular filter plate 4343 remains stationary, and the cleaned filter surface is ready for use. The gas meter as a whole returns to its initial safe standby state, achieving triple self-locking protection of backflow prevention, pressure stabilization, and self-cleaning.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite gas meter combining ultrasonic and diaphragm technology, comprising a gas meter body and a gas inlet and a gas outlet fixedly disposed on both sides of the top of the gas meter body, characterized in that, A gas control mechanism is detachably mounted on the top of the gas outlet, and the gas control mechanism includes: The first gas pipe is fixedly installed on the top of the gas outlet by bolts, and a second gas pipe communicating with the interior is fixedly installed on the side wall of the first gas pipe. The anti-backflow component is installed inside the second gas pipe. It is used to automatically adjust the cross-sectional area of ​​the gas passage according to the gas flow rate to stabilize the gas pressure inside the gas meter body, while intercepting particulate impurities in the gas and using the gas driving force to switch the filtration area to achieve continuous and efficient impurity removal. The gas follow-up component is installed inside the first gas pipe via a support frame and works in conjunction with the anti-backflow component. The gas follow-up component adjusts its rotation speed according to the gas flow rate. By using the magnitude of centrifugal force in relation to the opening of the gas passage of the anti-backflow component, the gas pressure inside the gas meter body is automatically and stably adjusted.

2. The ultrasonic and diaphragm composite gas meter according to claim 1, characterized in that: A bypass pipe is fixedly connected between the first gas pipe and the second gas pipe to connect their internal cavities; one end of the bypass pipe connected to the second gas pipe is located on the left side of the anti-backflow component, and a control valve for controlling the opening and closing of the channel is fixedly installed inside the bypass pipe, and a filter screen for filtering the gas output from the bypass pipe is fixedly installed inside the first gas pipe.

3. The ultrasonic and diaphragm composite gas meter according to claim 1, characterized in that: The gas-driven follow-up assembly includes a long rotating shaft. An impeller and a first bearing sleeve are fixedly installed at the bottom and top of the long rotating shaft, respectively. A second bearing sleeve is slidably fitted on the outer wall of the long rotating shaft. A spring limiting ring is fixedly fitted on the outer wall of the long rotating shaft between the first bearing sleeve and the second bearing sleeve. A spring is slidably fitted on the outer wall of the long rotating shaft between the second bearing sleeve and the spring limiting ring. Swing arms are symmetrically and rotatably installed on both sides of the outer wall of the first bearing sleeve. A counterweight ball is fixedly installed at the bottom of the swing arm. A connecting rod is rotatably installed between the swing arm and the second bearing sleeve. A lifting rod is rotatably fitted on the outer wall of the second bearing sleeve.

4. The ultrasonic and diaphragm composite gas meter according to claim 3, characterized in that: The anti-backflow component includes a drive shaft and a gear fixedly mounted on one end of the drive shaft. A flow control component and a filter component are respectively fitted on both sides of the outer wall of the drive shaft. The outer wall of the filter component is detachably equipped with a drive component. The flow control component includes a fixed partition plate fixedly disposed on the inner wall of the second gas pipe. The fixed partition plate has a movable cavity inside. The front of the movable cavity has a first arc-shaped gas passage. The movable cavity has a sealed and rotatable movable baffle plate inside. The movable baffle plate is coaxially arranged with the fixed partition plate. The outer wall of the movable baffle plate has a second arc-shaped gas passage plate adapted to the structure of the first arc-shaped gas passage plate.

5. The ultrasonic and diaphragm composite gas meter according to claim 4, characterized in that: The filter assembly includes an annular frame fixedly mounted on the outer wall of a fixed partition. An annular groove is provided inside the annular frame, and a circular filter plate is rotatably mounted inside the annular groove. An installation through hole is provided at the center of the circular filter plate, and a unidirectional rotation control component is provided inside the installation through hole to restrict the unidirectional rotation of the circular filter plate.

6. The ultrasonic and diaphragm composite gas meter according to claim 5, characterized in that: The unidirectional rotation control component includes an outer ring fixedly disposed inside the mounting through hole. Protective covers are detachably disposed at both ends of the outer ring. Multiple limiting grooves are evenly distributed on the inner wall of the outer ring. An inner ring is coaxially rotatably disposed inside the outer ring. Multiple receiving grooves are evenly distributed on the outer circumference of the inner ring. A limiting block is rotatably disposed inside the receiving groove via a rotating shaft. A metal spring is fixedly disposed inside the receiving groove. The metal spring pushes the limiting block into the limiting groove, so that the inner ring can only rotate in one direction.

7. The ultrasonic and diaphragm composite gas meter according to claim 6, characterized in that: The transmission assembly includes an end cap fixedly mounted on the outer wall of the ring frame. The outer wall of the end cap has a ventilation notch corresponding to the position of the second arc-shaped gas passage. Multiple cleaning brushes are fixedly mounted on the side wall of the ventilation notch near the circular filter plate to remove impurities adhering to the surface of the circular filter plate. A transmission box is fixedly mounted on the outer wall of the end cap away from the filter assembly. A drive rack that meshes with a gear is slidably mounted inside the transmission box. An avoidance through hole is provided on the top of the transmission box for the drive rack to pass through.

8. The ultrasonic and diaphragm composite gas meter according to claim 7, characterized in that: The bottom end of the drive rack is fixedly connected to the lifting rod. Only when the drive rack moves upward and drives the gear to rotate, the limiting block is blocked by the limiting groove and drives the protective cover to rotate synchronously. When the drive rack moves downward, the limiting block is pushed into the receiving groove by the inner wall of the outer ring, and the inner ring and the outer ring rotate relative to each other.

9. The ultrasonic and diaphragm composite gas meter according to claim 1, characterized in that: When the gas flow rate changes from low to high, the gas follow-up component drives the anti-backflow component through centrifugal force to achieve synchronous linkage between the gas channel opening and the filter switching action. When the gas is turned off and the flow rate is zero, the anti-backflow component automatically resets to the fully closed filter position, forming a triple self-locking protection of anti-backflow, pressure stabilization and self-cleaning.

10. A composite ultrasonic and diaphragm gas meter according to claim 7, characterized in that: The lifting stroke of the drive rack and the rotation angle of the circular filter plate and the cleaning trajectory of the cleaning brush form a unique matching relationship, so that the gas meter can maintain a stable working state with no filter blockage, no accumulation of impurities in the channel and no disturbance in metering in any flow range.

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