A gas flow meter detection device

Abstract

This application provides a gas flow meter testing device, including a testing tube and an electrically controlled valve. The testing tube includes a standard tube and a tested tube. Multiple tested tubes are evenly distributed around the standard tube, and the bottom of each tested tube is connected to the standard tube. The upper end of the standard tube is provided with an interface that can communicate with the gas outlet of a standard gas flow meter, and the upper end of the tested tube is provided with an interface that can communicate with the gas outlet of the tested gas flow meter. The electrically controlled valve is installed at the outlet at the bottom of the standard tube. When the electrically controlled valve is opened, the liquid levels in the standard tube and the tested tube will drop synchronously, so that the volume of gas flowing through the standard gas flow meter and the tested gas flow meter is the same. This gas flow meter testing device can use a single standard gas flow meter to test multiple tested gas flow meters simultaneously. The testing of multiple tested gas flow meters can be performed simultaneously, which is time-saving and eliminates the need for multiple standard gas flow meters, thus reducing the testing cost.

Description

Technical Field

[0001] This invention relates to the field of gas flow meters, and in particular to a gas flow meter detection device. Background Technology

[0002] Currently, gas flow meter testing typically employs a series method, which involves connecting a standard gas flow meter and the gas flow meter under test in series on the gas supply pipeline. The quality of the gas flow meter under test is determined by observing and comparing the flow counts of the standard gas flow meter and the gas flow meter under test.

[0003] In practical use, existing testing methods are affected by the inherent errors of each gas flow meter when taking readings. When a single standard gas flow meter tests multiple gas flow meters connected in series, the inherent errors of each meter gradually accumulate, affecting the readings, and the reading errors of the later gas flow meters are greater. When a standard gas flow meter tests only one gas flow meter, if there are many gas flow meters to be tested, multiple standard gas flow meters are needed or a long time is required, resulting in extremely high testing costs. Summary of the Invention

[0004] The present invention provides a gas flow meter testing device to solve the problem that existing gas flow meter testing devices cannot test multiple gas flow meters at the same time.

[0005] To address the aforementioned problems, this invention provides a gas flow meter detection device, comprising a detection tube and an electrically controlled valve. The detection tube includes a standard tube and a test tube, wherein multiple test tubes are evenly distributed around the standard tube, and the bottom of each test tube is connected to the standard tube. The upper end of the standard tube is provided with an interface that can communicate with the gas outlet of a standard gas flow meter, and the upper end of the test tube is provided with an interface that can communicate with the gas outlet of the gas flow meter under test. The electrically controlled valve is installed at the outlet at the bottom of the standard tube. When the electrically controlled valve is opened, the liquid levels in the standard tube and the test tube will drop synchronously, making the volume of gas flowing through the standard gas flow meter and the gas flow meter under test the same.

[0006] Furthermore, a liquid pump is installed at the outlet of the standard pipe to control the liquid flow rate, so as to test the gas flow meter under test at different flow rates.

[0007] Furthermore, a base is installed below the detection tube. The base includes a fixed plate and a movable plate. The movable plate is slidably mounted on the fixed plate. A guide assembly and a spring are provided between the fixed plate and the movable plate. A displacement sensor and a data processor are also installed between the movable plate and the fixed plate. The displacement sensor is fixedly mounted on the fixed plate, and the data processor is fixedly mounted on the movable plate. The displacement sensor can measure the distance between the fixed plate and the movable plate and convert it into an electrical signal, which is then sent to the data processor. The data processor can control the electrically controlled valve.

[0008] Furthermore, the guiding assembly includes a guide groove and a guide post. The guide groove is fixedly installed on the upper surface of the fixed plate, and the guide post is fixedly installed on the lower surface of the movable plate. The guide post is slidably installed in the guide groove.

[0009] Furthermore, the guide post is a vertical post with an arc-shaped cross-section, and the guide groove is provided with an arc-shaped groove.

[0010] Furthermore, multiple guide grooves are evenly distributed around the fixed plate, and multiple guide posts are correspondingly arranged on the movable plate.

[0011] Furthermore, multiple springs are evenly distributed along the circumference of the fixed plate.

[0012] Furthermore, a straight groove is provided inside the guide post, and a spring is installed inside the straight groove. The lower end of the spring is fixedly connected to the bottom surface of the guide groove, and the upper end of the spring extends into the straight groove and is fixedly connected to the bottom of the straight groove.

[0013] Furthermore, the bottom of the tube under test is provided with a connecting port facing the standard tube, and a connecting pipe is installed in the connecting port, and the tube under test and the standard tube are connected through the connecting pipe.

[0014] Furthermore, each of the tested tubes has a connecting port on its side facing the adjacent tested tubes, and a connecting pipe is installed in the connecting port, and the adjacent tested tubes are connected through the connecting pipe.

[0015] Furthermore, a support plate is provided above the detection tube, and the upper end of the detection tube passes through the support plate and extends above the support plate. The standard gas flow meter and the gas flow meter under test are both snapped and fixed on the support plate. The inlet of the standard gas flow meter is connected to the atmosphere, and the outlet of the standard gas flow meter is connected to the standard tube. The inlet of the gas flow meter under test is connected to the atmosphere, and the outlet of the gas flow meter under test is connected to the tube under test.

[0016] Furthermore, a through hole is provided at the center of the support plate, through which the standard tube passes. Multiple through holes are evenly distributed along the edge of the support plate, through which the tube under test passes. A snap-fit ​​rod is provided at each of the through holes along the edge of the support plate, and a snap-fit ​​groove is provided on the side of the gas flow meter under test, into which the snap-fit ​​rod can extend.

[0017] Furthermore, two snap-fit ​​rods are provided at each of the through holes on the edge of the support plate, and snap-fit ​​grooves are provided on both sides of the gas flow meter being tested.

[0018] Furthermore, a connecting block is provided at the center of the support plate, and the standard gas flow meter can be snapped into the connecting block.

[0019] Furthermore, a limiting post is provided in the guide groove of the fixed plate, and a limiting groove is opened on the guide post of the movable plate, with the limiting post extending into the limiting groove.

[0020] Furthermore, an observation window is provided on the side of the tube being inspected away from the standard tube.

[0021] Furthermore, the tube being inspected is provided with a scale, which is located on one side of the observation window.

[0022] Furthermore, a float is provided inside the tube being inspected, and the float can be observed through the observation window.

[0023] Furthermore, the bottom of each of the tested tubes is connected to the adjacent tested tube.

[0024] This gas flow meter detection device has the following beneficial effects:

[0025] This gas flow meter testing device can simultaneously test multiple gas flow meters using a single standard gas flow meter by connecting a standard pipe and the pipe under test. The testing of multiple gas flow meters can be carried out at the same time, which is time-saving and eliminates the need for multiple standard gas flow meters, thus reducing the cost of testing operations. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an embodiment of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the overall flow meter removal system according to an embodiment of the present invention;

[0028] Figure 3 Embodiments of the present invention Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4This is a three-dimensional structural diagram of the detection tube and base according to an embodiment of the present invention;

[0030] Figure 5 This is a three-dimensional structural diagram of the detection tube according to an embodiment of the present invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the base from one perspective of an embodiment of the present invention;

[0032] Figure 7 This is a two-dimensional structural diagram of the base from a second perspective in an embodiment of the present invention.

[0033] In the diagram: 1. Base; 11. Fixing plate; 12. Movable plate; 2. Detection tube; 21. Standard tube; 22. Tube under test; 23. Connecting tube; 25. Observation window; 26. Scale; 27. Float; 3. Guide assembly; 31. Guide groove; 32. Guide post; 33. Limiting post; 34. Limiting groove; 4. Spring; 5. Displacement sensor; 6. Support plate; 61. Standard gas flow meter; 62. Gas flow meter under test; 63. Snap-fit ​​rod; 64. Connecting block. Detailed Implementation

[0034] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0035] like Figures 1 to 7 In the embodiment of the gas flow meter detection device of the present invention shown, a detection tube 2 and an electrically controlled valve are included. The detection tube includes a standard tube 21 and a test tube 22. Multiple test tubes 22 are evenly distributed around the standard tube 21, and the bottom of each test tube 22 is connected to the standard tube 21. The upper end of the standard tube 21 is provided with an interface that can communicate with the gas outlet of the standard gas flow meter 61, and the upper end of the test tube 22 is provided with an interface that can communicate with the gas outlet of the gas flow meter 62 under test. The electrically controlled valve is installed at the outlet at the bottom of the standard tube 21. After the electrically controlled valve is opened, the liquid levels in the standard tube 21 and the test tube 22 will drop synchronously, so that the volume of gas flowing through the standard gas flow meter and the gas flow meter under test is the same.

[0036] Specifically, when using this gas flow meter testing device, the testing tube 2 is filled with liquid. Then, the outlet of the standard gas flow meter 61 is sealed and connected to the upper end of the standard tube 21, and the outlet of the gas flow meter under test 62 is sealed and connected to the upper ends of each tested tube 22. The inlets of both the standard gas flow meter 61 and the tested gas flow meter 62 are open to the atmosphere. At this time, the electrically controlled valve opens, and the liquid in the standard tube 21 flows downwards from the valve. Because the standard tube 21 is connected to the tested tubes 22, and the upper ends of both are sealed, the liquid flows outwards, and the liquid levels in the standard tube 21 and the multiple tested tubes 22 drop synchronously, drawing outside air through the inlets of the standard gas flow meter 61 and the tested gas flow meter 62. The amount of gas drawn into the standard tube 21 and the tested tube 22 is the same, passing through the standard gas flow meter 61 and each tested gas flow meter 62. At this point, it is only necessary to read the gas flow meter 62. If the reading is the same as that of the standard gas flow meter 61, it is accurate; if the reading is different, it indicates an error. As the liquid flows out of the test tube 2, the liquid level gradually decreases. Before the liquid level drops to the connection point between the standard tube 21 and the tested tube 22, the electric control valve at the lower end of the standard tube 21 is closed, and the liquid in the standard tube 21 and the tested tube 22 stops flowing out. The testing process is convenient and easy to operate. Only a single standard gas flow meter 61 is needed to test multiple tested gas flow meters 62 simultaneously, resulting in low testing cost and fast testing speed.

[0037] In one embodiment of this application, preferably, a base 1 is installed below the detection tube 2. The base includes a fixed plate 11 and a movable plate 12. The movable plate 12 is slidably mounted on the fixed plate 11. A guide assembly and a spring 4 are provided between the fixed plate 11 and the movable plate 12. A displacement sensor 5 and a data processor are also installed between the fixed plate 11 and the movable plate 12. The displacement sensor 5 is fixedly mounted on the fixed plate 11, and the data processor is fixedly mounted on the movable plate 12. The displacement sensor 5 can measure the distance between the fixed plate 11 and the movable plate 12 and convert it into an electrical signal and send it to the data processor. The data processor can control the electric control valve.

[0038] When the gas flow meter detection device is in its initial state, there is no liquid in the detection tube 2, and the electric control valve is closed. After the detection operation begins, when liquid is injected into the detection tube 2, the overall weight of the detection tube 2 increases. This causes the movable plate 12 to compress the spring 4, and the movable plate 12 and the detection tube 2 move downwards as a whole. The displacement sensor 5 sends the distance between the movable plate 12 and the fixed plate 11 to the data processor in real time. Once the distance reaches the preset value, the data processor sends a signal to control the electric control valve to open, and the liquid in the standard tube 21 flows downwards. As the liquid flows out, the weight of the detection tube 2 gradually decreases. The spring 4 between the movable plate 12 and the fixed plate 11 is gradually released, increasing the distance between them. Once the distance reaches a preset value, the data processor controls the electronic valve to close, and the liquid in the detection tube 2 stops flowing out, allowing for the taking of readings during the detection operation. The preset value can be any value among the changes in liquid level before it drops to the point where the standard tube and the tube under test connect, ensuring that gas flow meters with different detection ranges can be tested, or that the same gas flow meter can be tested at different flow rates, provided that the experimental results are accurate.

[0039] It is worth mentioning that the change in spring 4 is the change in distance sensed by displacement sensor 5. The change in spring 4 is x = F / k, where k is the spring constant of spring 4, F is the force on spring 4, which is the weight of detection tube 2, the weight of fixing plate 11, the weight of liquid in detection tube 2, and the weight of gas meter. The weights of detection tube 2, fixing plate 11, and gas meter are all fixed. The weight of liquid in detection tube 2 is G = ρhπr², where ρ is the density of liquid, h is the height of detection tube, and r is the radius of detection tube. Therefore, it is only necessary to set the trigger position of displacement sensor 5 according to the weight of liquid in detection tube 2 to ensure that displacement sensor 5 can close the electric control valve before the liquid level in standard tube 21 and tested tube 22 drops to the connection point, thus preventing gas connection between standard tube 21 and tested tube 22 and ensuring accurate readings and valid detection results.

[0040] In one embodiment of this application, preferably, a liquid pump is also installed at the outlet of the standard pipe 21 to control the liquid flow rate, so as to test the gas flow meter 62 under different flow rates; this allows the application to test different types of gas flow meters, or to test the readings of the same gas flow meter under different flow rates, so as to test whether the readings of the gas flow meter under test are accurate.

[0041] Specifically, when using this gas flow meter testing device, the first step is to fill the standard tube and the tested tube with liquid, then open the electric control valve to allow the liquid in the standard tube to flow downwards under gravity. Once the liquid level in both tubes reaches the preset value, close the electric control valve and take readings of the standard and tested gas flow meters to determine if the tested gas flow meter reading is accurate, completing the first test. The second step is to open the electric control valve again after filling both tubes with liquid, then start the liquid pump. The pump draws liquid out of the standard tube, causing the liquid level in both tubes to drop rapidly to the preset value. Then, close the electric control valve and the liquid pump, and take readings of both the standard and tested gas flow meters to determine if the tested gas flow meter reading is accurate at different flow rates, completing the second test. The third step is to adjust the liquid pump to different power levels and repeat the previous step multiple times until the test results are comprehensive and accurate, completing the testing operation.

[0042] In one embodiment of this application, preferably, the guide assembly 3 includes a guide groove 31 and a guide post 32. The guide groove 31 is fixedly installed on the upper surface of the fixed plate 11, and the guide post 32 is fixedly installed on the lower surface of the movable plate 12. The guide post 32 is slidably installed in the guide groove 31, so that the movable plate 12 and the fixed plate 11 can only move in the vertical direction, preventing the movable plate 12 and the fixed plate 11 from being displaced in the horizontal direction.

[0043] In one embodiment of this application, preferably, as Figure 7 As shown, the guide post 32 is a vertical post with an arc-shaped cross-section, and the guide groove 31 is provided with an arc-shaped groove; this further restricts the movement direction of the movable plate 12, preventing relative deflection between the movable plate 12 and the fixed plate 11, and affecting the relative sliding between the movable plate 12 and the fixed plate 11.

[0044] In one embodiment of this application, preferably, multiple guide grooves 31 are evenly distributed circumferentially on the fixed plate 11, and multiple guide posts 32 are correspondingly provided on the movable plate 12, so that the guiding function is reliable.

[0045] In one embodiment of this application, preferably, multiple springs 4 are evenly distributed along the circumference of the fixed plate 11; this ensures reliable support of the fixed plate 11 for the movable plate 12 and also makes the force balance of the movable plate 12 stable.

[0046] In one embodiment of this application, preferably, as Figure 7 As shown, a straight groove is provided inside the guide post 32, and a spring 4 is installed in the straight groove. The lower end of the spring 4 is fixedly connected to the bottom surface of the guide groove 31, and the upper end of the spring 4 extends into the straight groove and is fixedly connected to the bottom of the straight groove; to prevent the spring 4 from deflecting in the liquid horizontal direction when compressed.

[0047] In one embodiment of this application, preferably, as Figure 5 As shown, the bottom of the tested tube 22 is provided with an installation port facing the standard tube 21, and a connecting tube 23 is installed in the installation port. The tested tube 22 and the standard tube 21 are connected through the connecting tube 23, ensuring that the liquid flow between the tested tube 22 and the connecting tube 23 can flow freely and the connection is reliable.

[0048] In one embodiment of this application, preferably, as Figure 5 As shown, each of the tested tubes 22 has a connecting port on its side facing the adjacent tested tubes 22, and a connecting pipe 23 is installed in the connecting port. The adjacent tested tubes 22 are connected through the connecting pipe 23. Each tested tube 22 is interconnected, which further ensures that the liquid level in each tested tube 22 and the standard tube 21 can drop synchronously.

[0049] In one embodiment of this application, preferably, the connecting pipe 23 is provided with an external thread and the connecting port is provided with an internal thread, and the connecting pipe 23 and the connecting port are connected by threads, which facilitates installation and disassembly.

[0050] In one embodiment of this application, preferably, a support plate 6 is provided above the detection tube 2, the upper end of the detection tube 2 passes through the support plate 6 and extends above the support plate 6, and both the standard gas flow meter 61 and the gas flow meter under test 62 are snapped and fixed on the support plate 6. The inlet of the standard gas flow meter 61 is connected to the atmosphere, and the outlet of the standard gas flow meter 61 is connected to the standard tube 21. The inlet of the gas flow meter under test 62 is connected to the atmosphere, and the outlet of the gas flow meter under test 62 is connected to the tube under test 22. This facilitates the fixing of the gas flow meter under test 62 and the standard gas flow meter 61, and facilitates the testing operation of this application.

[0051] In one embodiment of this application, preferably, a through hole is provided at the center of the support plate 6, through which the standard tube 21 passes. Multiple through holes are evenly distributed along the edge of the support plate 6, through which the tube to be tested 22 passes. A snap-fit ​​rod 63 is provided at each through hole along the edge of the support plate 6, and a snap-fit ​​groove is provided on the side of the gas flow meter 62 to be tested, into which the snap-fit ​​rod 63 can extend. This makes the snap-fit ​​of the gas flow meter 62 to be tested convenient and quick, allowing for immediate use without the need for bolt fixation, further improving the ease of operation of this application.

[0052] In one embodiment of this application, preferably, two snap-fit ​​rods 63 are provided at each through hole on the edge of the support plate 6, and snap-fit ​​grooves are provided on both sides of the gas flow meter 62 being tested, so that the snap-fit ​​is stable and reliable.

[0053] In one embodiment of this application, preferably, a connecting block 64 is provided at the center of the support plate 6, and the standard gas flow meter 61 can be snapped into the connecting block 64; this facilitates the fixing of the standard gas flow meter 61.

[0054] In one embodiment of this application, preferably, a limiting post 33 is provided in the guide groove 31 on the fixed plate 11, and a limiting groove 34 is provided on the guide post 32 on the movable plate 12, with the limiting post 33 extending into the limiting groove 34; this prevents the movable plate 12 from detaching from the fixed plate 11, thereby improving the reliability and practicality of this application.

[0055] In one embodiment of this application, preferably, an observation window 25 is provided on the side of the tube under test 22 away from the standard tube 21; this allows the liquid level in the tube under test 22 to be observed at any time during the testing operation, to determine whether the liquid level in the tube under test 22 is decreasing synchronously, and to improve the reliability of the testing operation of this application.

[0056] In one embodiment of this application, preferably, the tube under test 22 is provided with a scale 26, which is located on one side of the observation window 25; it can be used in conjunction with the readings of the gas flow meter under test 62 and the standard gas flow meter 61 to further ensure the accuracy and reliability of the test results of this application.

[0057] In one embodiment of this application, preferably, a float 27 is provided inside the tube under test 22; in conjunction with the observation window 25, it facilitates observation of the liquid level position inside the tube under test 22.

[0058] In one embodiment of this application, preferably, the bottom of each test tube 22 is connected to the adjacent test tube 22.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas flow meter detection apparatus, characterized by: The system includes a detection tube and an electrically controlled valve. The detection tube comprises a standard tube and a test tube. Multiple test tubes are evenly distributed around the standard tube, and the bottom of each test tube is connected to the standard tube, so that all test tubes are connected in parallel with the standard tube. The upper end of the standard tube is provided with an interface that can communicate with the outlet of a standard gas flow meter, and the upper end of the test tube is provided with an interface that can communicate with the outlet of the gas flow meter under test. The inlets of both the standard gas flow meter and the gas flow meter under test are open to the atmosphere. The electrically controlled valve is installed at the outlet at the bottom of the standard tube. When the electrically controlled valve is opened, the liquid levels in the liquid-filled standard tube and the liquid-filled test tube will drop synchronously, drawing outside air from the inlets of the standard gas flow meter and the gas flow meter under test into the standard tube and the test tube, so that the volume of gas flowing through the standard gas flow meter and the gas flow meter under test is the same.

2. The gas flow meter testing apparatus of claim 1, wherein: A liquid pump is also installed at the outlet of the standard pipe to control the liquid flow rate, so as to test the gas flow meter under test at different flow rates.

3. The gas flow meter testing apparatus of claim 1, wherein: A base is installed below the detection tube. The base includes a fixed plate and a movable plate. The movable plate is slidably mounted on the fixed plate. A guide assembly and a spring are provided between the fixed plate and the movable plate. A displacement sensor and a data processor are also installed between the movable plate and the fixed plate. The displacement sensor is fixedly mounted on the fixed plate, and the data processor is fixedly mounted on the movable plate. The displacement sensor can measure the distance between the fixed plate and the movable plate and convert it into an electrical signal, which is then sent to the data processor. The data processor can control the electrically controlled valve.

4. The gas flow meter testing apparatus of claim 3, wherein: The guiding assembly includes a guide groove and a guide post. The guide groove is fixedly installed on the upper surface of the fixed plate, and the guide post is fixedly installed on the lower surface of the movable plate. The guide post is slidably installed in the guide groove.

5. The gas flow meter testing apparatus of claim 4, wherein: A limiting post is provided in the guide groove of the fixed plate, and a limiting groove is opened on the guide post of the movable plate, with the limiting post extending into the limiting groove.

6. The gas flow meter detection device according to claim 1, characterized in that: The bottom of the tube under test is provided with an installation port facing the standard tube, and a connecting pipe is installed in the installation port. The tube under test and the standard tube are connected through the connecting pipe.

7. The gas flow meter detection device according to claim 1, characterized in that: Each of the tubes under test has a connecting port on its side facing the adjacent tubes under test, and a connecting pipe is installed in the connecting port, and the adjacent tubes under test are connected through the connecting pipe.

8. The gas flow meter detection device according to claim 1, characterized in that: A support plate is provided above the detection tube. The upper end of the detection tube passes through the support plate and extends above the support plate. The standard gas flow meter and the gas flow meter under test are both snapped and fixed on the support plate. The inlet of the standard gas flow meter is connected to the atmosphere, and the outlet of the standard gas flow meter is connected to the standard tube. The inlet of the gas flow meter under test is connected to the atmosphere, and the outlet of the gas flow meter under test is connected to the tube under test.

9. The gas flow meter detection device according to claim 8, characterized in that: The support plate has a through hole at its center, through which the standard tube passes. Multiple through holes are evenly distributed along the edge of the support plate, through which the tube under test passes. A snap-fit ​​rod is provided at each of the through holes along the edge of the support plate. A snap-fit ​​groove is provided on the side of the gas flow meter under test, into which the snap-fit ​​rod can extend.

10. The gas flow meter detection device according to claim 1, characterized in that: An observation window is provided on the side of the tube being tested away from the standard tube.

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