Ultrasonic gas meter pulsating flow durability evaluation device

Abstract

The utility model belongs to the technical field of gas meter detection equipment, and particularly relates to an ultrasonic gas meter pulsating flow durability evaluation device. The pulsating flow durability evaluation device for the ultrasonic gas meter comprises an evaluation inlet pipe, a branch pipe, a pressure regulating pipeline mechanism, a first confluence pipe, a to-be-tested mechanism, a second confluence pipe and a return pipeline, the inlet end of the evaluation inlet pipe is communicated with an external fuel gas access pipeline, and the outlet end of the evaluation inlet pipe is communicated with the side wall of the branch pipe; the pressure regulating pipeline mechanism comprises a plurality of pressure regulating pipelines capable of evaluating the meter to be tested; the inlet ends of the plurality of pressure regulating pipelines are all communicated with the branch pipe, and the outlet ends of the plurality of pressure regulating pipelines are all communicated with the first confluence pipe. According to the utility model, natural gas with different pressure grades or different vibration working conditions is simulated in different passages, and after the natural gas circularly enters the gas meter for a certain period, whether the metering performance of the gas meter still meets the requirements is evaluated, and the durability of the ultrasonic gas meter can be detected.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas meter detection equipment, and in particular relates to an ultrasonic gas meter pulsating flow durability evaluation device. Background Art

[0002] As ultrasonic gas meter technology continues to mature, ultrasonic gas meters are rapidly seizing the market with their advantages such as wide metering range, maintenance-free use, and low pressure loss.

[0003] The working principle of ultrasonic gas meter is as follows: ultrasonic gas meter uses the time difference method to measure the gas flow rate, and reflects the flow rate of the fluid by measuring the difference in the speed of ultrasonic signal when it propagates in the fluid in the downstream and upstream directions. Because the error caused by the change of the sound speed of the time difference method with the fluid temperature is small and the accuracy is high, it is currently widely used. However, the use time of ultrasonic gas meter is relatively short, and the impact of different use environments on it has not been fully evaluated.

[0004] At present, in the process of testing the pass rate of ultrasonic gas meters, pulsation detection is generally performed on ultrasonic gas meters. However, the pulsation detection devices of some ultrasonic gas meters are relatively simple in structure and cannot realize simultaneous detection of multiple ultrasonic gas meters.

[0005] To this end, the utility model intends to design a multi-channel ultrasonic gas meter pulsating flow durability evaluation device, which can detect the durability of the ultrasonic gas meter by simulating natural gas of different pressure levels or different vibration conditions in different channels and circulating it into the gas meter for a certain period of time to evaluate whether the metering performance of the gas meter still meets the requirements. Utility Model Content

[0006] Based on the technical problems existing in the prior art, the utility model proposes a pulsating flow durability evaluation device for an ultrasonic gas meter, which can detect the durability of an ultrasonic gas meter by simulating natural gas of different pressure levels or different vibration conditions in different passages and circulating it into the gas meter for a certain period of time to evaluate whether the metering performance of the gas meter still meets the requirements.

[0007] Based on the above purpose, the utility model adopts the following technical solutions:

[0008] An ultrasonic gas meter pulsating flow durability evaluation device comprises an evaluation inlet pipe, a branch pipe, a pressure regulating pipeline mechanism, a first converging pipe, a mechanism to be tested, a second converging pipe and a return pipeline;

[0009] The inlet end of the evaluation inlet pipe is connected to the external gas access pipeline, and the outlet end of the evaluation inlet pipe is connected to the side wall of the branch pipe;

[0010] The pressure regulating pipeline mechanism includes a plurality of pressure regulating pipelines capable of evaluating the meter to be tested;

[0011] The inlet ends of the plurality of pressure regulating pipelines are all connected to the branch pipe, and the outlet ends of the plurality of pressure regulating pipelines are all connected to the first converging pipe;

[0012] The mechanism to be tested includes a plurality of meters to be tested, the inlet ends of the plurality of meters to be tested are connected to the first confluence pipe through pipelines, and the outlet ends of the plurality of meters to be tested are connected to the second confluence pipe through pipelines;

[0013] The other end of the second confluence pipe is connected to the inlet end of the return pipe, and the outlet end of the return pipe is connected to the side wall of the evaluation inlet pipe.

[0014] Furthermore, an air intake electric ball valve and a fuel gas compressor are provided on the evaluation inlet pipe.

[0015] Specifically, the pressure regulating pipeline consists of three branches, namely the first branch, the second branch and the third branch; the inlet ends of the first branch, the second branch and the third branch are all connected to the branch pipe, and the outlet ends of the first branch, the second branch and the third branch are all connected to the first converging pipe.

[0016] Furthermore, the first branch is provided with a first manual ball valve, a first remote pressure regulator, a first pressure stabilizing tank and a first electric ball valve; the second branch is provided with a second manual ball valve, a second remote pressure regulator, a second pressure stabilizing tank and a second electric ball valve; the third branch is provided with a third manual ball valve, a third remote pressure regulator, a third pressure stabilizing tank and a third electric ball valve.

[0017] Furthermore, the first pressure stabilizing tank is provided with a first remote pressure gauge, the second pressure stabilizing tank is provided with a second remote pressure gauge, and the third pressure stabilizing tank is provided with a third remote pressure gauge.

[0018] Further preferably, the first confluence pipe is also provided with a confluence pipe remote pressure gauge for detecting the pressure on the first confluence pipe.

[0019] Specifically, there are three meters, namely a first meter to be tested, a second meter to be tested, and a third meter to be tested.

[0020] Furthermore, the inlet end of the first meter to be tested is connected to the side wall of the first confluence pipe through the first air inlet pipe; the outlet end of the first meter to be tested is connected to the second confluence pipe through the first air outlet pipe.

[0021] Further preferably, a fourth manual ball valve and a first pipeline vibrator are provided on the first air inlet pipe; and a first balancing valve is provided on the first air outlet pipe.

[0022] Furthermore, the inlet end of the second meter to be tested is connected to the side wall of the first confluence pipe through the second air inlet pipe; the outlet end of the second meter to be tested is connected to the second confluence pipe through the second air outlet pipe.

[0023] Further preferably, a fifth manual ball valve and a second pipe vibrator are provided on the second air inlet pipe; and a second balancing valve is provided on the second air outlet pipe.

[0024] Furthermore, the inlet end of the third meter to be tested is connected to the side wall of the first confluence pipe through the third air inlet pipe; the outlet end of the third meter to be tested is connected to the second confluence pipe through the third air outlet pipe.

[0025] Further preferably, a sixth manual ball valve and a third pipeline vibrator are provided on the third air inlet pipe; and a third balancing valve is provided on the third air outlet pipe.

[0026] Further preferably, the first balancing valve, the second balancing valve, and the third balancing valve function to balance the pressure between the first meter to be tested, the second meter to be tested, or the third meter to be tested and the fuel gas compressor.

[0027] Furthermore, a reflux pipe electric ball valve is provided on the reflux pipe.

[0028] Furthermore, the connection point between the return pipeline and the evaluation inlet pipe is located on the pipeline between the air intake electric ball valve and the fuel gas compressor.

[0029] Furthermore, the manual ball valve and the electric ball valve involved in the utility model are both one-way valves.

[0030] Compared with the prior art, the beneficial effects of the utility model are:

[0031] The device of the utility model simulates natural gas of different pressure levels or different vibration conditions in different passages, and after circulating into the gas meter for a certain period, evaluates whether the metering performance of the gas meter still meets the requirements, and can detect the durability of the ultrasonic gas meter.

[0032] The device of the utility model has a simple structure and is easy to operate, and can be applied to the durability test of gas meters of different models. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the ultrasonic gas meter pulsating flow durability evaluation device described in Example 1. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the following will provide a more comprehensive and detailed description of the present invention in conjunction with the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

[0035] Unless otherwise defined, all professional terms used below have the same meaning as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present utility model.

[0036] Example 1

[0037] like Figure 1 As shown, an ultrasonic gas meter pulsating flow durability evaluation device includes an evaluation inlet pipe 1, a branch pipe 2, a pressure regulating pipeline mechanism, a first confluence pipe 5, a mechanism to be tested, a second confluence pipe 91 and a return pipeline 92;

[0038] The inlet end of the evaluation inlet pipe 1 is connected to the external gas access pipeline, and the outlet end of the evaluation inlet pipe 1 is connected to the side wall of the branch pipe 2; the evaluation inlet pipe 1 is provided with an air intake electric ball valve 11 and a gas compressor 12;

[0039] The pressure regulating pipeline mechanism includes a plurality of pressure regulating pipelines capable of evaluating the meter to be tested. Specifically, the pressure regulating pipeline in this embodiment includes three branches, namely, a first branch, a second branch and a third branch; the inlet ends of the first branch, the second branch and the third branch are all connected to the branch pipe 2, and the outlet ends of the first branch, the second branch and the third branch are all connected to the first confluence pipe 5;

[0040] Specifically, in this embodiment, the inlet end of the first branch is connected to one end of the branch pipe 2 ( Figure 1 The inlet end of the second branch is connected to the side wall of the branch pipe 2, and the inlet end of the third branch is connected to the other end of the branch pipe 2 ( Figure 1 The middle part is the lower end of the branch pipe 2) connected;

[0041] The outlet end of the first branch and one end of the first confluence pipe 5 ( Figure 1 The outlet end of the second branch is connected to the side wall of the first confluence pipe 5, and the outlet end of the second branch is connected to the other end of the first confluence pipe 5 ( Figure 1 The middle part is the lower end of the first confluence pipe 5).

[0042] The first branch is provided with a first manual ball valve 21, a first remote voltage regulator 22, a first pressure stabilizing tank 23 and a first electric ball valve 24; the second branch is provided with a second manual ball valve 31, a second remote voltage regulator 32, a second pressure stabilizing tank 33 and a second electric ball valve 34; the third branch is provided with a third manual ball valve 41, a third remote voltage regulator 42, a third pressure stabilizing tank 43 and a third electric ball valve 44;

[0043] The first pressure stabilizing tank 23 is also provided with a first remote pressure gauge, the second pressure stabilizing tank 33 is also provided with a second remote pressure gauge, and the third pressure stabilizing tank 43 is also provided with a third remote pressure gauge.

[0044] Further preferably, a confluence pipe remote pressure gauge 51 is also provided on the first confluence pipe 5 for detecting the pressure on the first confluence pipe 5 .

[0045] The mechanism to be tested includes several meters to be tested. Specifically, in this embodiment, there are three meters, namely, a first meter to be tested 6, a second meter to be tested 7 and a third meter to be tested 8;

[0046] The inlet end of the first meter to be tested 6 is connected to the side wall of the first confluence pipe 5 through the first air inlet pipe; the outlet end of the first meter to be tested 6 is connected to the second confluence pipe 91 through the first air outlet pipe; the first air inlet pipe is provided with a fourth manual ball valve 61 and a first pipeline vibrator 62; the first air outlet pipe is provided with a first balancing valve 63;

[0047] The inlet end of the second test meter 7 is connected to the side wall of the first confluence pipe 5 through the second air inlet pipe; the outlet end of the second test meter 7 is connected to the second confluence pipe 91 through the second air outlet pipe; the second air inlet pipe is provided with a fifth manual ball valve 71 and a second pipe vibrator 72; the second air outlet pipe is provided with a second balancing valve 73;

[0048] The inlet end of the third test meter 8 is connected to the side wall of the first confluence pipe 5 through the third air inlet pipe; the outlet end of the third test meter 8 is connected to the second confluence pipe 91 through the third air outlet pipe; the third air inlet pipe is provided with a sixth manual ball valve 81 and a third pipeline vibrator 82; the third air outlet pipe is provided with a third balancing valve 83;

[0049] Specifically, in this embodiment, the outlet end of the first meter to be tested 6 is connected to the first gas outlet pipe and one end of the second confluence pipe 91 ( Figure 1 The outlet end of the second meter to be tested 7 is connected to the side wall of the second confluence pipe 91 through the second air outlet pipe; the outlet end of the third meter to be tested 8 is connected to the side wall of the second confluence pipe 91 through the third air outlet pipe.

[0050] The first manual ball valve 21 , the second manual ball valve 31 , the third manual ball valve 41 , the fourth manual ball valve 61 , the fifth manual ball valve 71 , and the sixth manual ball valve 81 involved in the utility model adopt conventional equipment in the field, and are all manual regulating valves.

[0051] The first balancing valve 63 , the second balancing valve 73 , and the third balancing valve 83 function to balance the pressure between the first meter to be tested 6 , the second meter to be tested 7 , or the third meter to be tested 8 and the fuel gas compressor 12 .

[0052] The other end of the second confluence pipe 91 ( Figure 1 The end of the second confluence pipe 91 at the bottom is connected to the inlet end of the return pipe 92, and the outlet end of the return pipe 92 is connected to the side wall of the evaluation inlet pipe 1; the return pipe electric ball valve 93 is provided on the return pipe 92;

[0053] Furthermore, the connection point between the return pipeline 92 and the evaluation inlet pipe 1 is located on the pipeline between the air intake electric ball valve 11 and the fuel gas compressor 12 .

[0054] The manual ball valve and the electric ball valve involved in the utility model are both one-way valves.

[0055] The gas compressor 12 can compress the circulating gas in the meter to be tested as a test gas source to meet the test requirements. If the reflux gas cannot meet the requirements, the gas source is supplemented by external gas. The main function of the gas compressor 12 is pressurization. The gas compressor 12 adopts conventional equipment in the prior art and is not the inventive point of the utility model, so it will not be described in detail.

[0056] During the test, the first manual ball valve 21 and the first electric ball valve 24, the second manual ball valve 31 and the second electric ball valve 34, the third manual ball valve 41 and the third electric ball valve 44 are opened as needed; after the test, they are closed to prevent leakage of natural gas in the pressure stabilizing tank;

[0057] The first remote voltage regulator 22, the second remote voltage regulator 32, and the third remote voltage regulator 42 are all common devices in the prior art, and their main function is to reduce the air pressure in the pipeline. Their structures are not the inventive point of the present utility model, so they will not be described in detail.

[0058] The first remote pressure gauge, the second remote pressure gauge, and the third remote pressure gauge are all provided with a signal sending end, and are signal-connected to the external first PLC control unit. The external first PLC control unit is signal-connected to the first remote voltage regulator 22, the second remote voltage regulator 32, and the third remote voltage regulator 42. The pressure in the first pressure-regulating tank 23 is detected by the first remote pressure gauge, the pressure in the second pressure-regulating tank 33 is detected by the second remote pressure gauge, or the pressure in the third pressure-regulating tank 43 is detected by the third remote pressure gauge, and a signal for reducing the air pressure is sent to the external first PLC control unit; the external first PLC control unit then sends a signal for reducing the air pressure to the first remote voltage regulator 22, the second remote voltage regulator 32, or the third remote voltage regulator 42, respectively, and the first remote voltage regulator 22, the second remote voltage regulator 32, or the third remote voltage regulator 42 is started respectively, which can reduce the air pressure in the first branch, the second branch, or the third branch;

[0059] Among them, the signal connection method between the first remote pressure gauge, the second remote pressure gauge, the third remote pressure gauge and the external first PLC control unit adopts conventional technical means in this field, and is not the inventive point of the utility model, so it will not be repeated.

[0060] When the first remote pressure gauge detects that the pressure in the first pressure regulating tank 23 rises to the set pressure, the second remote pressure gauge detects that the pressure in the second pressure regulating tank 33 rises to the set pressure, or the third remote pressure gauge detects that the pressure in the third pressure regulating tank 43 rises to the set pressure, a signal for reducing the air pressure is sent to the external first PLC control unit, and the external first PLC control unit then sends a signal for reducing the air pressure to the first remote pressure regulator 22, the second remote pressure regulator 32, and the third remote pressure regulator 42 respectively, and the first remote pressure regulator 22, the second remote pressure regulator 32, and the third remote pressure regulator 42 are respectively started to reduce the air pressure in the first branch, the second branch, or the third branch;

[0061] When the first remote pressure gauge, the second remote pressure gauge, and the third remote pressure gauge detect that the pressure in the first pressure stabilizing tank 23, the second pressure stabilizing tank 33, or the third pressure stabilizing tank 43 drops, the fuel gas compressor 12 is adjusted to increase the pressure of the first branch, the second branch, or the third branch;

[0062] The upper limit flow rate of the pressure regulation at the outlet of the first remote voltage regulator 22, the second remote voltage regulator 32, and the third remote voltage regulator 42 is not less than 0.4 MPa;

[0063] The closing or opening response time of the first electric ball valve 24, the second electric ball valve 34, and the third electric ball valve 44 does not exceed 100ms;

[0064] The first electric ball valve 24, the second electric ball valve 34, and the third electric ball valve 44 are all provided with a signal sending end, and are connected to the external second PLC control unit by signal. The second PLC control unit sends an opening signal or a closing signal to the first electric ball valve 24, the second electric ball valve 34, and the third electric ball valve 44, and the start and stop time, sequence and number of cycles of each electric ball valve can be set, so as to achieve the circulation of gas with different pressure waveforms;

[0065] Among them, the signal connection method between the first electric ball valve 24, the second electric ball valve 34, the third electric ball valve 44 and the external second PLC control unit adopts conventional technical means in this field, and is not the inventive point of the utility model, so it will not be repeated.

[0066] The first pipe vibrator 62, the second pipe vibrator 72, and the third pipe vibrator 82 all adopt common equipment in the field. Their structures are not the inventive point of the present utility model, so they are not described in detail. The first pipe vibrator 62, the second pipe vibrator 72, and the third pipe vibrator 82 use compressed air as a power source and can apply lateral and longitudinal vibrations to the pipeline within the frequency range of 10HZ-150HZ, and the pipeline vibration displacement amplitude does not exceed 0.35mm.

[0067] The operating principle of the utility model is:

[0068] Before the evaluation, the first meter to be tested 6 is installed with a pipeline, that is, the inlet end of the first meter to be tested 6 is connected to the side wall of the first confluence pipe 5 through the first air inlet pipe; the outlet end of the first meter to be tested 6 is connected to the second confluence pipe 91 through the first air outlet pipe;

[0069] The second meter to be tested 7 is installed in the pipeline, that is, the inlet end of the second meter to be tested 7 is connected to the side wall of the first confluence pipe 5 through the second air inlet pipe; the outlet end of the second meter to be tested 7 is connected to the second confluence pipe 91 through the second air outlet pipe;

[0070] The third meter to be tested 8 is installed in the pipeline, that is, the inlet end of the third meter to be tested 8 is connected to the side wall of the first confluence pipe 5 through the third air inlet pipe; the outlet end of the third meter to be tested 8 is connected to the second confluence pipe 91 through the third air outlet pipe;

[0071] Then, first close the return pipe electric ball valve 93, the first manual ball valve 21, the first electric ball valve 24, the second manual ball valve 31, the second electric ball valve 34, the third manual ball valve 41, the third electric ball valve 44, the fourth manual ball valve 61, the first balancing valve 63, the fifth manual ball valve 71, the second balancing valve 73, the sixth manual ball valve 81, and the third balancing valve 83, open the air intake electric ball valve 11 and the fuel gas compressor 12, and select one, two, or three of the meters to be tested for evaluation according to the needs of the evaluation;

[0072] For example, when it is necessary to evaluate the first meter to be tested 6, the first manual ball valve 21 and the first electric ball valve 24 are opened, and the natural gas pressurized by the fuel gas compressor 12 enters the first branch, and the first pressure stabilizing tank 23 is filled with gas. Then the fourth manual ball valve 61, the first balancing valve 63, and the return pipe electric ball valve 93 are opened, and the gas in the first branch enters the first meter to be tested 6 through the first air inlet pipe, and then flows into the second confluence pipe 91 through the first air outlet pipe, and finally flows back to the fuel gas compressor 12. At this time, the natural gas circulates among the evaluation inlet pipe 1, the first branch, the first air inlet pipe, the first meter to be tested 6, the first air outlet pipe, and the second confluence pipe 91;

[0073] By pressurizing the fuel gas compressor 12, different pressure conditions can be simulated, thereby changing the pressure level of the natural gas entering the first test meter 6, and using the first remote pressure gauge, the first pressure stabilizing tank 23, and the first remote pressure regulator 22 to monitor and stabilize the pressure of the first branch, the tolerance of the first test meter 6 to different pressures can be evaluated; in addition, the first pipeline vibrator 62 can be used to apply lateral and longitudinal vibrations to the pipeline within the frequency range of 10HZ-150HZ, which can simulate different vibration conditions and evaluate the tolerance of the first test meter 6 to different vibration conditions;

[0074] After the device of the utility model is operated for a period of time under different working conditions, the durability of the ultrasonic gas meter to be tested can be detected. Specifically, after running for a period of time, the first manual ball valve 21, the first electric ball valve 24, the fourth manual ball valve 61, and the first balancing valve 63 are closed, and the ultrasonic gas meter to be tested is disassembled to detect its function. If it meets the requirements and meets the use standards of ultrasonic gas meters, it can continue to be used. If it does not meet the standards, it will be scrapped.

[0075] In addition, the device of the utility model can also perform double-branch and three-branch tests. The test method is the same as above. The main difference is that when performing double-branch tests, two of the first branch, the second branch, and the third branch are opened, and the durability of the ultrasonic gas meter to be tested is tested after a certain period of pressurization or vibration treatment is performed by the gas compressor 12 and the fourth manual ball valve 61, the fifth manual ball valve 71, or the sixth manual ball valve 81.

[0076] When conducting a dual-branch test, the first branch, the second branch and the third branch are opened at the same time, and after a certain period of pressurization or vibration treatment is performed by the gas compressor 12 and the fourth manual ball valve 61, the fifth manual ball valve 71 or the sixth manual ball valve 81, the durability of the ultrasonic gas meter to be tested is tested.

[0077] Advantages of the device of the utility model:

[0078] 1. The test gas is natural gas, which is closer to the actual working conditions than compressed air, and the conclusions obtained are more real and reliable.

[0079] 2. This device recycles the test gas through the fuel gas compressor, reduces the emission of natural gas, reduces the test cost, and reduces the emission of greenhouse gases.

[0080] 3. This device is equipped with three pressure stabilizing tanks. When conducting three-branch evaluation, it can ensure that the three pressure conditions can be switched at will. Compared with a single-channel pressure reducing device, it reduces the pressure reducing and stabilizing process and is more in line with the requirements of the durability evaluation model.

[0081] 4. This device can simulate pulsating flow and vibration superposition conditions at the same time, which is more in line with harsh on-site environment conditions, and the test results are more instructive.

[0082] 5. The electric ball valve, remote pressure regulator and pipeline vibrator of this device are all controlled by PLC background. Different working conditions can be set to meet the evaluation requirements of different phenotypes to be tested, and errors caused by human operation can also be avoided.

[0083] 6. The three pipe vibrators involved in the utility model can also be controlled by a PLC control unit. A start signal is sent to the three pipe vibrators through an external PLC control unit, and the three pipe vibrators are immediately turned on to generate a lateral or pipe vibrator vibration frequency and adjust the working times of the pipe vibrators.

[0084] 7. The device described in the utility model has the characteristics of high reliability, high precision, high efficiency and easy maintenance.

[0085] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0086] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0087] Finally, it should be noted that the above are only preferred embodiments and application technical principles of the utility model. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the utility model. Therefore, although the utility model is described in more detail through the above embodiments, the utility model is not limited to the specific embodiments described here, and may include more other effective embodiments without departing from the concept of the utility model, and the scope of the utility model is determined by the scope of the attached claims.

Claims

1. An ultrasonic gas meter pulsating flow durability evaluation device, characterized in that: It includes an evaluation inlet pipe, a branch pipe, a pressure regulating pipeline mechanism, a first converging pipe, a mechanism to be tested, a second converging pipe and a return pipeline; The inlet end of the evaluation inlet pipe is connected to the external gas access pipeline, and the outlet end of the evaluation inlet pipe is connected to the side wall of the branch pipe; The pressure regulating pipeline mechanism includes a plurality of pressure regulating pipelines capable of evaluating the meter to be tested; The inlet ends of the plurality of pressure regulating pipelines are all connected to the branch pipe, and the outlet ends of the plurality of pressure regulating pipelines are all connected to the first converging pipe; The mechanism to be tested includes a plurality of meters to be tested, the inlet ends of the plurality of meters to be tested are connected to the first confluence pipe through pipelines, and the outlet ends of the plurality of meters to be tested are connected to the second confluence pipe through pipelines; The other end of the second confluence pipe is connected to the inlet end of the return pipe, and the outlet end of the return pipe is connected to the side wall of the evaluation inlet pipe.

2. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: The evaluation inlet pipe is equipped with an air intake electric ball valve and a fuel gas compressor.

3. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: The pressure regulating pipeline consists of three branches, namely the first branch, the second branch and the third branch; the inlet ends of the first branch, the second branch and the third branch are all connected to the branch pipe, and the outlet ends of the first branch, the second branch and the third branch are all connected to the first converging pipe.

4. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: The first branch is provided with a first manual ball valve, a first remote pressure regulator, a first pressure stabilizing tank and a first electric ball valve; the second branch is provided with a second manual ball valve, a second remote pressure regulator, a second pressure stabilizing tank and a second electric ball valve; the third branch is provided with a third manual ball valve, a third remote pressure regulator, a third pressure stabilizing tank and a third electric ball valve.

5. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: The first pressure stabilizing tank is also provided with a first remote pressure gauge, the second pressure stabilizing tank is also provided with a second remote pressure gauge, and the third pressure stabilizing tank is also provided with a third remote pressure gauge.

6. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: There are three meters, namely a first meter to be tested, a second meter to be tested and a third meter to be tested.

7. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: The inlet end of the first meter to be tested is connected to the side wall of the first confluence pipe through the first air inlet pipe; the outlet end of the first meter to be tested is connected to the second confluence pipe through the first air outlet pipe; The first air inlet pipe is provided with a fourth manual ball valve and a first pipeline vibrator; the first air outlet pipe is provided with a first balancing valve.

8. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: The inlet end of the second meter to be tested is connected to the side wall of the first confluence pipe through the second air inlet pipe; the outlet end of the second meter to be tested is connected to the second confluence pipe through the second air outlet pipe; The second air inlet pipe is provided with a fifth manual ball valve and a second pipeline vibrator; the second air outlet pipe is provided with a second balancing valve.

9. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: The inlet end of the third meter to be tested is connected to the side wall of the first confluence pipe through the third air inlet pipe; the outlet end of the third meter to be tested is connected to the second confluence pipe through the third air outlet pipe; The third air inlet pipe is provided with a sixth manual ball valve and a third pipeline vibrator; the third air outlet pipe is provided with a third balancing valve.

10. The ultrasonic gas meter pulsating flow durability evaluation device according to claim 1, characterized in that: A return pipe electric ball valve is provided on the return pipe.

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