A gas meter gas sound velocity testing device

Abstract

The utility model is suitable for gas metering technical field provides a kind of gas table gas sound velocity test equipment, including jar body and test module;The both ends of jar body are connected with end cover by fixed part, and the joint of end cover and jar body is provided with sealing ring, and the jar body has test chamber inside;The test module is set in test chamber;The test module includes the fixed plate and moving plate of parallel opposite arrangement, and the spacing adjusting mechanism for adjusting and fixing the distance between fixed plate and moving plate is arranged;Transducer transmitting part is installed on the fixed plate by first fixed support, and transducer receiving part is installed on the moving plate by second fixed support, which is arranged opposite to the transducer transmitting part.The utility model solves the problem that the transducer spacing of existing gas sound velocity test equipment is not adjustable, which limits the measurement range.

Description

Technical Field

[0001] This utility model relates to the field of gas metering technology, and in particular to a gas meter gas sound velocity testing device. Background Technology

[0002] In the research and calibration of ultrasonic gas meters, accurately measuring the velocity of sound in the gas medium is a crucial step in ensuring measurement accuracy. Currently, the industry commonly uses open or simple closed cavities for gas sound velocity testing, but these existing devices generally have several shortcomings: First, their structural sealing is poor, and leaks are prone to occur when different types or pressures of test gases (such as natural gas, air, or mixed gases) are filled in, making it difficult to maintain a stable testing environment; second, the distance between the transmitting and receiving transducers is mostly fixed and cannot be flexibly adjusted according to testing requirements, limiting the measurement range and accuracy, especially in low flow rate or high-precision calibration scenarios.

[0003] In order to solve the above-mentioned technical problems, this utility model designs a gas sound velocity testing device for a gas meter. Utility Model Content

[0004] This utility model provides a gas sound velocity testing device for gas meters, aiming to solve the problem of limited measurement range caused by the non-adjustable transducer spacing in existing gas sound velocity testing devices. The technical solution is as follows: A gas sound velocity testing device for a gas meter includes a tank and a testing module. End caps are connected to both ends of the tank via fasteners, and a sealing ring is provided at the joint between the end caps and the tank. A testing chamber is located inside the tank. The testing module is disposed within the testing chamber. The testing module includes a fixed plate and a movable plate arranged parallel to each other, with a spacing adjustment mechanism between the fixed plate and the movable plate for adjusting and fixing the distance between them. A transducer transmitter is mounted on the fixed plate via a first fixed bracket, and a transducer receiver is mounted on the movable plate via a second fixed bracket, opposite to the transducer transmitter.

[0005] Based on the above technical solution, the spacing adjustment mechanism includes at least two support rods, the support rods are guide rail structures, and the movable plate is slidably mounted on the guide rail and fixed in position by a locking component.

[0006] Preferably, the tank body has an inlet for filling or discharging test gas, and the inlet is provided with a plug.

[0007] Preferably, a circuit board mounting plate is fixed on the movable plate, and the circuit board is disposed in the circuit board mounting plate.

[0008] Beneficial effects Compared with the prior art, the beneficial effects of this utility model are: 1. By setting up an adjustable and lockable spacing test module, along with parallel aligned transducers, the accurate and controllable length of the ultrasonic wave propagation path is ensured. Temperature and pressure sensors enable the synchronous acquisition of key parameters required for sound velocity measurement, improving the accuracy of sound velocity calculation and test repeatability.

[0009] 2. As a dedicated channel, the conduit effectively constrains the movement trajectory of the cables, avoids mechanical stress concentration, and significantly extends the service life of the cable harness. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0011] Figure 1 : A schematic diagram of the structure of this utility model; Figure 2 : Exploded view of the structure of this utility model; Figure 3 : A schematic diagram of the structure of the test module described in this utility model; Figure 4 : Exploded view of the test module described in this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and examples: The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0014] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] like Figure 1 As shown, a gas meter gas velocity testing device includes a tank 1 and a testing module 5.

[0016] like Figure 2 As shown, end caps 2 are connected to both ends of the tank body 1 via fasteners 4, and sealing rings 3 are provided at the joint between the end caps 2 and the tank body 1. The sealing rings 3 can prevent the test gas (such as natural gas) from leaking during the test, ensuring the stability of the gas composition and pressure in the test chamber, and providing reliable and consistent environmental conditions for sound velocity measurement.

[0017] The tank 1 has a test chamber; the test module 5 is located inside the test chamber.

[0018] like Figure 3 and Figure 4 As shown, the test module 5 includes a fixed plate 51 and a movable plate 53 arranged in parallel opposite directions. A spacing adjustment mechanism is provided between the fixed plate 51 and the movable plate 53 for adjusting and fixing the distance between them.

[0019] Specifically, the spacing adjustment mechanism includes at least two support rods 52, each a guide rail structure. The movable plate 53 is slidably mounted on the guide rail and fixed in position by a locking element. The locking element is a flexible coupling 58. The flexible coupling 58, as a locking element, can fix the position of the movable plate in the locked state, preventing minor displacement during inflation or pressurization.

[0020] The movable plate 53 slides along the guide rail, allowing for flexible adjustment of its distance from the fixed plate 51, thereby changing the propagation path length between the ultrasonic transmitter and receiver. Sound velocity calculation: c = L / t, where L is the propagation distance and t is the flight time. This allows for improved measurement accuracy or adaptation to testing requirements under different gas / pressure conditions using multiple sets of data with varying spacing.

[0021] In another embodiment, the support rod 52 is a two-section telescopic rod with a limiting device. The distance between the fixed plate 51 and the movable plate 53 can be quickly adjusted by manually stretching or compressing the telescopic rod. The limiting device, such as a buckle, pin hole, or stop ring, can limit and fix the distance between the fixed plate 51 and the movable plate 53.

[0022] A transducer transmitter 561 is mounted on the fixed plate 51 via a first fixed bracket 551, and a transducer receiver 562, which is disposed opposite to the transducer transmitter 561, is mounted on the movable plate 53 via a second fixed bracket 552.

[0023] If it is necessary to replace the transducer with a different frequency or model to adapt to different gases such as natural gas, air, propane, etc., it can be done quickly by simply disassembling the corresponding mounting bracket, without modifying the overall structure.

[0024] The tank body 1 is provided with a filling inlet 11 for filling or discharging test gas, and a plug 6 is provided on the filling inlet 11. Different types of gas (such as natural gas, manufactured gas, propane, etc. or standard calibration gas) can be filled into the test chamber through the filling inlet, and the gas pressure can also be adjusted to simulate the actual working environment of the gas meter.

[0025] A circuit board mounting plate 531 is fixed on the movable plate 53, and the circuit board 57 is disposed in the circuit board mounting plate 531.

[0026] The circuit board 57 is a PCBA that integrates signal acquisition and processing circuitry, receiving and processing ultrasonic signals from the transducer transmitter 561 and the transducer receiver 562.

[0027] The PCBA also integrates patch-type temperature and pressure sensors to measure the gas temperature and pressure inside the test chamber in real time.

[0028] The surface-mount (SMT) temperature and pressure sensors are directly soldered onto the PCBA surface, eliminating the need for additional brackets or external probes, thus greatly saving the limited test chamber space inside the tank.

[0029] When adjusting the spacing, the movable plate 53 will slide or extend relative to the fixed plate 51. If the transducer's wiring harness is exposed, repeated movement can easily cause the wires to bend, pull, or wear.

[0030] To solve the above problems, a wiring conduit 54 is also provided between the fixed plate 51 and the movable plate 53. The wiring harnesses of the transducer transmitter 561 and the transducer receiver 562 pass through the wiring conduit 54 and are connected to the circuit board 57.

[0031] Preferably, the conduit 54 has a retractable flexible structure (e.g., a spiral metal flexible hose, corrugated pipe, cable chain trough, or multi-section sleeve). It can extend or shorten synchronously with the displacement of the moving plate 53. The tank body 1 and end cap 2 are made of chrome-plated stainless steel. The gas in the gas meter (such as natural gas, liquefied petroleum gas, etc.) contains trace amounts of sulfides, moisture, or other corrosive components. The stainless steel substrate has good resistance to chemical corrosion, and the chrome plating on the surface further forms a dense passivation layer, significantly improving the resistance to acidic, humid, or impurity-containing gases and extending the service life of the equipment.

[0032] In use, the end caps 2 are securely installed at both ends of the tank body 1 by the fasteners 4, the sealing rings 3 are intact, and the plugs 6 are fastened to the charging inlet 11. The test module 5 is installed inside the tank body 1, and the transducer transmitter 561 and receiver 562 are aligned parallel to each other.

[0033] Loosen the locking element (such as the flexible coupling 58), slide the movable plate 53 along the guide rail of the support rod 52, or use the tension / compression telescopic support rod, to adjust the distance between the fixed plate 51 and the movable plate 53 to the required test sound path. After adjustment, re-tighten the locking element to ensure that the spacing remains stable during the test.

[0034] The cable conduit 54 expands and contracts synchronously with the spacing changes, protecting the internal cable harness from being pulled.

[0035] Remove plug 6 and fill the tank with the gas to be tested, such as natural gas or a standard mixture, through filling inlet 11. The filling pressure can be controlled to the set value using an external pressure gauge. After filling, reinstall and tighten the sealing plug 6 to ensure the test chamber is sealed.

[0036] When the power is turned on, the signal processing circuit on circuit board 57 drives the transducer transmitter 561 to emit ultrasonic pulses. After the ultrasonic waves pass through the test gas, they are received by the transducer receiver 562, and the circuit board records the time of flight. At the same time, the surface-mount temperature sensor and pressure sensor integrated on the PCBA collect the temperature and pressure data of the gas in the chamber in real time.

[0037] The device calculates the speed of sound in the current gas using the formula: c = L / t.

[0038] Where L is the set transducer spacing, t is the measured ultrasonic flight time, and the current sound velocity c in the gas is calculated. Combined with measured temperature and pressure data, the sound velocity can also be compensated for (e.g., corrected to standard reference conditions), which can be used for the calibration of ultrasonic gas meters or gas composition analysis.

[0039] After the measurement is completed, open the plug 6 to release the test gas. After ventilation, the end cap 2 can be removed for maintenance or replacement of the test module.

[0040] It should be noted that the transducers and circuit boards in this embodiment are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0041] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A gas sound velocity testing device for a gas meter, characterized in that: The test module includes a tank (1) and a test module (5). The two ends of the tank (1) are connected to end caps (2) by fasteners (4). A sealing ring (3) is provided at the joint between the end caps (2) and the tank (1). The tank (1) has a test chamber. The test module (5) is located in the test chamber. The test module (5) includes a fixed plate (51) and a movable plate (53) arranged in parallel opposite directions. A spacing adjustment mechanism for adjusting and fixing the distance between the fixed plate (51) and the movable plate (53) is provided. A transducer transmitter (561) is installed on the fixed plate (51) by a first fixed bracket (551). A transducer receiver (562) is installed on the movable plate (53) by a second fixed bracket (552) and is arranged opposite to the transducer transmitter (561).

2. The gas sound velocity testing device for a gas meter according to claim 1, characterized in that: The spacing adjustment mechanism includes at least two support rods (52), the support rods (52) are guide rail structures, and the movable plate (53) is slidably mounted on the guide rail and fixed in position by a locking member.

3. The gas sound velocity testing device for a gas meter according to claim 2, characterized in that: The support rod (52) is a two-section telescopic rod, and a limiting device is provided on the telescopic rod.

4. The gas sound velocity testing device for a gas meter according to claim 2, characterized in that: The locking element is a flexible coupling (58).

5. The gas sound velocity testing device for a gas meter according to claim 1, characterized in that: The tank (1) is provided with an inlet (11) for filling or discharging test gas, and a plug (6) is provided on the inlet (11).

6. The gas sound velocity testing device for a gas meter according to claim 1, characterized in that: The movable plate (53) is fixed with a circuit board mounting plate (531), and the circuit board (57) is disposed in the circuit board mounting plate (531).

7. The gas sound velocity testing device for a gas meter according to claim 1, characterized in that: A conduit (54) is also provided between the fixed plate (51) and the movable plate (53), through which the wiring harnesses of the transducer transmitter (561) and the transducer receiver (562) pass and are connected to the circuit board (57).

8. The gas sound velocity testing device for a gas meter according to claim 1, characterized in that: The tank body (1) and end cap (2) are made of stainless steel with chrome plating.

9. A gas sound velocity testing device for a gas meter according to claim 7, characterized in that: The circuit board (57) is a PCBA that integrates signal acquisition and processing circuitry, and receives and processes ultrasonic signals from the transducer transmitter (561) and the transducer receiver (562).

10. A gas sound velocity testing device for a gas meter according to claim 9, characterized in that: The PCBA also integrates patch-type temperature and pressure sensors to measure the gas temperature and pressure inside the test chamber in real time.

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