Device and method for automatically testing metering performance of water meter

Abstract

The invention discloses automatic testing equipment and a testing method for the metering performance of a water meter, and relates to the technical field of flow detection. The automatic testing equipment comprises a meter body and further comprises a flow guide pipe fixedly installed at the bottom of the meter body, and a main shaft and an auxiliary shaft are rotationally installed in the flow guide pipe; and the testing part is arranged in the flow guide pipe and is communicated with the meter body. The device has the advantages that when the metering performance of the water meter is tested, testing is carried out through a high flow gear and a low flow gear, the device is suitable for testing fluid with lower flow, the state that the turbine cavity is full of fluid during testing is kept, the first turbine is locked during low-gear testing, the first turbine is prevented from rotating under the action of fluid flowing, and the testing efficiency is improved. Meanwhile, the turbine cavity is kept full of fluid, the metering operation can be stopped immediately when the fluid stops flowing, the response speed of the turbine is increased, the metering of the fluid flow is more accurate, and the situation that the metering is too large due to inertia is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of flow detection, and in particular to an automatic testing device and a testing method for water meter measurement performance. Background Art

[0002] The turbine flowmeter is an instrument commonly used for measuring fluid flow. Its working principle is to infer the flow rate based on the mechanical motion generated when the fluid passes through the turbine inside the flowmeter. It can be used to test the metering performance of water meters.

[0003] When testing the metering performance of a water meter, an existing turbine flowmeter uses water flow to drive the turbine shaft to rotate. Since there is a certain friction force in the rotation of the turbine, the friction resistance can be ignored for a water body with a large flow rate, but for a water body with a low flow rate, the resistance affects the rotation of the turbine, causing a corresponding delay of the turbine, thereby causing a metering deviation. Therefore, the announcement number CN118882755A discloses a turbine flowmeter for flow measurement, which includes a connecting pipe, a flange is connected to each end of the connecting pipe, and a magnetoelectric induction converter is arranged on the connecting pipe; a connecting pipe having a plurality of flanges connected to each end of the connecting pipe; and a connecting pipe having a plurality of flanges connected to each end of the connecting pipe. Two parallel fixing frames are arranged in the tube, the fixing frames are connected to the inner wall of the connecting tube, the two fixing frames are symmetrical about the magnetoelectric induction converter, the fixing frames on both sides are connected to the same rotating shaft, and the rotating shaft is coaxially connected to the turbine; a guide tube is arranged on the feed side of the connecting tube, the guide tube is connected to the inner wall of the connecting tube, and a through hole coaxial with the connecting tube is arranged on the inner side of the guide tube; a tensioning and telescopic component is also arranged in the connecting tube, the tensioning and telescopic component connects the fixing frame and the cone, the tip of the cone is inserted into the through hole and is coaxial with the through hole; a channel cross-sectional area monitoring component connecting the cone and the connecting tube is also arranged in the connecting tube.

[0004] The above-mentioned turbine flowmeter can reduce the jet gap when measuring small flows by setting up a guide tube, a tensioning and telescopic assembly, and a matching structure of a cone, thereby increasing the injection velocity of the fluid, and using the high-flow-rate fluid to drive the turbine to rotate, so that the turbine can effectively overcome the friction between the turbine and the rotating shaft.

[0005] In actual use, the jet speed of the fluid is increased by reducing the jet gap, which can increase the rotation speed of the turbine to a certain extent and is beneficial to the detection of the turbine speed. However, at this time, the turbine is not driven by the flow of fluid, but by the impact force of the jet. At this time, the turbine cavity of the meter body is not filled with fluid. Therefore, after the jet stops, the turbine is subject to little resistance from the fluid, which will cause the turbine to continue to rotate under its own inertia, resulting in a larger flow test.

[0006] Therefore, a new type of water meter measurement performance automatic testing equipment and testing method can be used to solve the shortcomings of the prior art. Summary of the invention

[0007] The purpose of the present invention is to solve the problems existing in the prior art and to propose an automatic testing device and a testing method for water meter measurement performance.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A water meter measurement performance automatic testing device comprises a meter body, and also comprises a flow guide tube fixedly mounted at the bottom of the meter body, wherein a main shaft and a secondary shaft are rotatably mounted inside the flow guide tube; a testing part, mounted inside the flow guide tube, connected with the meter body, and used for testing the flow rate of a fluid inside the flow guide tube, a sealing assembly is mounted between the flow guide tube and the meter body, a high flow rate testing assembly and a low flow rate testing assembly are mounted inside the flow guide tube, the high flow rate testing assembly is used for measuring a fluid with a high flow rate, the high flow rate testing assembly comprises a first turbine, and the low flow rate testing assembly is used for measuring a fluid with a low flow rate, the low flow rate testing assembly comprises a second turbine, and a metering assembly matched with the main shaft and the secondary shaft is mounted inside the meter body; a shifting part, mounted inside the flow guide tube, and used for switching between a high flow rate test and a low flow rate test, the shifting part comprises a lane changing assembly and a locking assembly, the lane changing assembly is used for switching the flow channel of the fluid inside the flow guide tube, and the locking assembly is used for locking the main shaft or the secondary shaft after switching.

[0009] Preferably, the sealing assembly includes a fixed shell fixedly installed between the guide tube and the meter body, a top partition fixedly installed on the fixed shell and abutting the top of the first turbine, a sealing ring fixedly installed between the top partition and the fixed shell, a middle partition fixedly installed inside the guide tube and abutting the bottom of the first turbine, the gap between the middle partition and the top partition is the first turbine chamber, and the main shaft passes through and extends to the bottom of the middle partition.

[0010] Preferably, the high flow rate test assembly further comprises a permanent magnet rotating sleeve fixedly installed in the flow guide tube, and the main shaft and the permanent magnet rotating sleeve are through-rotatably connected.

[0011] Preferably, the low flow rate test assembly also includes a through hole opened on the main shaft, a bearing with inner and outer rings is fixedly installed in the through hole, the outer ring of the bearing is fixedly connected to the main shaft, the secondary shaft is fixedly connected to the inner ring of the bearing, a first lower partition and a second lower partition are fixedly installed inside the guide tube, a second turbine chamber is between the first lower partition and the second lower partition, the second turbine is located in the second turbine chamber, and the top and bottom of the second turbine are respectively attached to the corresponding first lower partition and second lower partition, and the secondary shaft passes through and extends to below the second lower partition.

[0012] Preferably, the metering component includes a one-way bearing fixedly mounted on the main shaft and the secondary shaft, a first gear ring fixedly mounted on the one-way bearing on the main shaft, a second gear ring fixedly mounted on the one-way bearing on the secondary shaft, a rear shaft body rotatably mounted on the meter body, a first gear meshing with the first gear ring fixedly mounted on the shaft body, and a second gear meshing with the second gear ring fixedly mounted on the shaft body, a rotating sensing wheel fixedly mounted on the shaft body, a speed sensor matching the rotating sensing wheel fixedly mounted on the meter body, and a conversion module matching the speed sensor fixedly mounted on the meter body.

[0013] Preferably, the guide pipe is fixedly connected with two docking flanges, one of which is used for fluid inflow and the other is used for fluid outflow, and a baffle matching the docking flange for fluid inflow is fixedly installed in the guide pipe, and the middle partition is located in the lower and middle part of the docking flange.

[0014] Preferably, the channel changing assembly includes a water inlet cover fixedly installed inside the guide pipe and matched with the fluid inflow docking flange, and a water outlet cover fixedly installed inside the guide pipe and matched with the fluid outflow docking flange, a water inlet baffle slidably installed inside the water inlet cover, a water outlet baffle slidably installed inside the water outlet cover, a guide plate matched with the second turbine is fixedly installed between the first lower partition plate and the second lower partition plate, and the guide plate is connected to the water inlet cover and the water outlet cover.

[0015] Preferably, the locking assembly includes a limiting slide rail fixedly mounted on the upper part of the first lower partition, a sliding frame is slidably mounted on the limiting slide rail, and a frame body is slidably mounted on the lower part of the second lower partition, a connecting block is fixedly mounted on the frame body and the sliding frame, an elastic telescopic rod is fixedly mounted on the two connecting blocks, and a stop block matching the corresponding main shaft and secondary shaft is fixedly mounted on the telescopic ends of the two elastic telescopic rods, the two stop blocks operate alternately, and the two stop blocks are respectively located on both sides of the main shaft symmetrically, and when the stop block matching the main shaft is against the main shaft, the stop block matching the secondary shaft is separated from the secondary shaft, and a driving mechanism matching the frame body, the sliding frame, the water inlet baffle and the water outlet baffle is installed on the guide pipe.

[0016] Preferably, the driving mechanism includes a bottom shell fixedly mounted on the bottom of the guide tube, an electric push rod fixedly mounted inside the bottom shell, a movable frame slidably mounted inside the guide tube, the movable frame is fixedly connected to the frame body and the sliding frame, two second tooth plates are fixedly mounted on the movable frame, two gear cylinders meshing with the corresponding second tooth plates are rotatably mounted in the guide tube, a first tooth plate meshing with the corresponding gear cylinder is fixedly mounted on the water inlet baffle and the water outlet baffle, and the two first tooth plates are staggered with the corresponding second tooth plates.

[0017] The present invention also provides a method for automatically testing the measurement performance of a water meter, comprising the above-mentioned automatic testing device for the measurement performance of a water meter, and further comprising the following steps: S1. When the flow rate is high, the fluid flows through the guide tube, and the channel change component blocks the flow channel passing through the second turbine. At this time, the fluid drives the first turbine to rotate, and then the metering component counts the speed of the first turbine, and the fluid flow rate is calculated by the number of rotations of the first turbine; S2, when the flow rate is low, the channel through the first turbine is blocked by the channel changing component, so that the fluid passes through the channel of the second turbine, which will drive the second turbine to rotate, so as to measure the low flow rate; S3. When measuring low flow rate, the main shaft is locked by the locking assembly, and when measuring high flow rate, the secondary shaft is locked by the locking assembly to reduce the influence of the rotation of the main shaft and the secondary shaft on each other.

[0018] Compared with the prior art, the present invention has the following advantages: 1. When the present invention is testing the metering performance of a water meter, a first turbine and a second turbine are provided, and a conversion component is provided between the first turbine and the second turbine. The second turbine is switched with the second turbine according to the flow rate of the fluid. During the test, the turbine chamber of the first turbine or the second turbine is in a slow fluid state, so that the test result is more accurate. At the same time, the flow rate test can also be performed on the fluid with a lower flow rate, thereby expanding the test range.

[0019] 2. When the present invention is testing the metering performance of a water meter, by setting a main shaft and a secondary shaft, the rotating induction wheel can be driven to rotate through a linkage component at the same speed. The flow rate of the second turbine rotation is calculated according to the volume ratio of the first turbine cavity and the second turbine cavity. At this time, there is no need to debug the test parameters of the meter body. It is only necessary to adjust the flow test to a low flow gear through a conversion module, so that the flow test is more accurate.

[0020] 3. When the water metering performance test is carried out in the present invention, the main shaft and the first turbine are locked during the low flow test by setting a connecting block and a stop block to prevent the first turbine from rotating under the thrust of the fluid flow, thereby causing the flow test to be too small. At the same time, the second turbine chamber can be blocked by the water outlet baffle and the water inlet baffle to ensure that the second turbine chamber remains full of fluid, thereby improving the accuracy of the low flow test.

[0021] To summarize, the present invention performs the test through two flow gears, high and low, when conducting the water metering performance test, and is suitable for testing fluids with lower flow rates. The turbine chamber is kept full of fluid during the test, and the first turbine is locked during the low gear test to prevent the first turbine from rotating under the action of the fluid flow, which would cause the test to be too small. At the same time, the turbine chamber is kept full of fluid, and the metering operation can be stopped immediately when the fluid stops flowing, thereby improving the response speed of the turbine, making the measurement of the fluid flow more accurate, and preventing the measurement from being too large due to inertia. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the automatic testing device for water meter measurement performance proposed by the present invention; Figure 2 for Figure 1 Detailed schematic diagram of the exploded structure; Figure 3 for Figure 2 A detailed schematic diagram of the enlarged structure of the middle flow guide pipe and the docking flange; Figure 4 for Figure 3 A schematic detailed view of the plan structure along one of the angles; Figure 5 for Figure 4 Detailed schematic diagram of the three-dimensional structure along the AA section; Figure 6 for Figure 3 A schematic detailed view of the plan structure from another angle; Figure 7 for Figure 3 Detailed schematic diagram of the exploded structure; Figure 8 for Figure 7 Detailed schematic diagram of the structure of the central guide pipe, the butt flange and the baffle; Fig. 9 for Figure 7 An enlarged schematic detailed diagram of the structure of the first turbine and its surrounding components; Fig.10 for Fig. 9 Detailed schematic diagram of the structure after being rotated to a certain angle; Fig.11 for Fig.10 A schematic detailed diagram of the structure of the first turbine, the second turbine, the main shaft and the secondary shaft; Fig.12 for Fig.11 A schematic detailed diagram of the enlarged structure of part B; Fig.13 for Fig. 9Detailed schematic diagram of the structure of the middle water inlet cover, water inlet baffle, second turbine and its peripheral components; Fig.14 for Fig. 9 A schematic detailed diagram of the structure after removing the permanent magnet rotating sleeve, the middle partition, the first lower partition and the second lower partition; Fig.15 for Fig.14 A schematic detailed view of the plan structure along one of the angles; Fig.16 for Fig.14 An enlarged structural schematic detail diagram of the center stopper, secondary shaft and its surrounding components.

[0023] In the figure: 1 meter body, 2 guide tube, 3 docking flange, 4 conversion module, 5 speed sensor, 6 fixed shell, 7 sealing ring, 8 top baffle, 9 baffle, 10 first turbine, 11 middle baffle, 12 first lower baffle, 13 second lower baffle, 14 permanent magnet rotating sleeve, 15 bottom shell, 16 water inlet cover, 17 water inlet baffle, 18 water outlet cover, 19 water outlet baffle, 20 main shaft, 21 electric push rod, 22 second turbine, 23 secondary shaft, 24 rotating induction wheel, 25 first gear, 26 first gear ring, 27 second gear, 28 second gear ring, 29 one-way bearing, 30 guide plate, 31 gear cylinder, 32 first gear plate, 33 second gear plate, 34 moving frame, 35 stop block, 36 limit slide rail, 37 sliding frame, 38 elastic telescopic rod, 39 connecting block, 40 frame body. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1: Reference Figure 1-Figure 5 , an automatic testing device for water meter measurement performance, including a meter body 1, which is an existing electronic device and has a signal converter inside, which can automatically convert the signal during detection into an electrical signal and display it on the meter body 1.

[0026] It also includes a flow guide tube 2 fixedly installed at the bottom of the meter body 1, and a main shaft 20 and a secondary shaft 23 are rotatably installed inside the flow guide tube 2; a testing part is installed inside the flow guide tube 2 and connected with the meter body 1, and is used to test the flow rate of the fluid inside the flow guide tube 2. A sealing assembly is installed between the flow guide tube 2 and the meter body 1. The flow guide tube 2 is a four-way tube, and is through-designed up, down, left, and right.

[0027] The sealing assembly includes a fixed shell 6 fixedly installed between the guide tube 2 and the meter body 1, a top partition 8 abutting the top of the first turbine 10 is fixedly installed on the fixed shell 6, a sealing ring 7 is fixedly installed between the top partition 8 and the fixed shell 6, a middle partition 11 abutting the bottom of the first turbine 10 is fixedly installed inside the guide tube 2, the gap between the middle partition 11 and the top partition 8 is the first turbine chamber, the main shaft 20 passes through and extends to the bottom of the middle partition 11, because the main shaft 20 rotates, the main shaft 20 and the middle partition 11 are connected by a mechanical rotating sealing structure, which is an existing sealing structure and will not be elaborated here.

[0028] This part can seal between the top partition 8 and the fixed shell 6 to prevent the fluid in the guide tube 2 from passing through the top partition 8, which can effectively improve the accuracy of the test and ensure the pressure stability in the guide tube 2. In addition, the purpose of the first turbine 10 being in contact with the top partition 8 and the middle partition 11 is to ensure that the fluid flows through the first turbine 10.

[0029] Embodiment 2: This embodiment is different from the embodiment 1 in that: Figure 1-Figure 8 , Figure 10-12 A high flow rate test assembly and a low flow rate test assembly are installed in the guide tube 2. The high flow rate test assembly is used for measuring high flow fluids. The high flow rate test assembly includes a first turbine 10. The low flow rate test assembly is used for measuring low flow fluids. The low flow rate test assembly includes a second turbine 22. When the fluid flow rate is higher than a certain value (this value is the lowest flow rate value of the existing turbine flowmeter, generally 1 L / h to 10 L / h), the fluid will flow through the first turbine 10, and when the fluid flow rate is lower than a certain value, the fluid will flow through the second turbine 22.

[0030] The high flow rate test assembly also includes a permanent magnet rotating sleeve 14 fixedly installed in the guide tube 2. The main shaft 20 and the permanent magnet rotating sleeve 14 are connected through rotation. The permanent magnet rotating sleeve 14 can effectively reduce the friction resistance encountered by the main shaft 20 during rotation, thereby improving the measurement accuracy. When performing a high flow rate test, the fluid will drive the first turbine 10 to rotate, thereby driving the main shaft 20 to rotate.

[0031] The low flow rate test assembly also includes a through hole opened on the main shaft 20, in which a bearing with inner and outer rings is fixedly installed, the outer ring of the bearing is fixedly connected to the main shaft 20, the secondary shaft 23 is fixedly connected to the inner ring of the bearing, and a first lower partition 12 and a second lower partition 13 are fixedly installed inside the guide tube 2. A second turbine chamber is between the first lower partition 12 and the second lower partition 13. The second turbine 22 is located in the second turbine chamber, and the top and bottom of the second turbine 22 are respectively attached to the corresponding first lower partition 12 and the second lower partition 13, and the secondary shaft 23 passes through and extends to the bottom of the second lower partition 13.

[0032] The purpose of the top and bottom of the second turbine 22 being respectively in contact with the corresponding first lower partition 12 and second lower partition 13 is to reduce the amount of fluid flowing out of the gap between the second turbine 22 and the first lower partition 12 and the second lower partition 13, thereby improving the accuracy of the test. When performing a low flow test, the fluid will pass through the second turbine 22 to drive the second turbine 22 to rotate, thereby driving the secondary shaft 23 to rotate.

[0033] A metering component matched with the main shaft 20 and the secondary shaft 23 is installed in the meter body 1, and the metering component includes a one-way bearing 29 fixedly installed on the main shaft 20 and the secondary shaft 23, a first gear ring 26 is fixedly installed on the one-way bearing 29 on the main shaft 20, and a second gear ring 28 is fixedly installed on the one-way bearing 29 on the secondary shaft 23. A rear shaft body is rotatably installed on the meter body 1, a first gear 25 meshing with the first gear ring 26 is fixedly installed on the shaft body, and a second gear 27 meshing with the second gear ring 28 is fixedly installed on the shaft body, a rotating sensing wheel 24 is fixedly installed on the shaft body, a speed sensor 5 matched with the rotating sensing wheel 24 is fixedly installed on the meter body 1, and a conversion module 4 matched with the speed sensor 5 is fixedly installed on the meter body 1.

[0034] High flow test: The main shaft 20 rotates to drive the one-way bearing 29 to rotate, thereby driving the first gear ring 26 to rotate. The first gear ring 26 rotates to drive the first gear 25 meshing therewith to rotate, thereby driving the shaft body to rotate. The shaft body drives the rotating induction wheel 24 to rotate. The speed sensor 5 is used to detect the speed of the rotating induction wheel 24. The flow rate of the fluid is calculated by the number of revolutions of the rotating induction wheel 24. Low flow test: The rotation of the secondary shaft 23 drives the one-way bearing 29 to rotate, thereby driving the second gear ring 28 to rotate. The rotation of the second gear ring 28 drives the second gear 27 meshing therewith to rotate, thereby driving the shaft body to rotate.

[0035] Since a one-way bearing 29 is installed between the main shaft 20 and the first gear ring 26, and a one-way bearing 29 is also installed between the secondary shaft 23 and the second gear ring 28, the first gear 25 and the second gear 27 can only be driven to rotate by the first gear ring 26 and the second gear ring 28, and the first gear ring 26 and the second gear ring 28 will not be driven to rotate by the first gear 25 and the second gear 27. Therefore, when the main shaft 20 drives the shaft body to rotate, the outer ring of the one-way bearing 29 on the secondary shaft 23 rotates, and does not drive the secondary shaft 23 to rotate. Similarly, when the secondary shaft 23 rotates, it does not drive the main shaft 20 to rotate.

[0036] The switch between the low flow test and the high flow test will automatically change the calculation method of the meter body 1 through the conversion module 4. When the sensing wheel 24 is rotated the same number of times, the ratio of the flow rate of the low flow test to the flow rate of the high flow test is the ratio of the volume of the first turbine chamber to the volume of the second turbine chamber.

[0037] There are two docking flanges 3 fixedly connected on the guide pipe 2, one of which is used for fluid inflow and the other is used for fluid outflow. A baffle 9 is fixedly installed in the guide pipe 2 to match the docking flange 3 for fluid inflow, and the middle partition 11 is located in the middle and lower part of the docking flange 3.

[0038] The middle partition 11 divides the water outlet of the docking flange 3 into two parts, upper and lower parts. During the high flow test, the fluid flows through the first turbine 10 from the top of the middle partition 11. During the low flow test, the fluid flows through the second turbine 22 from the bottom of the middle partition 11. The first turbine 10 and the second turbine 22 are both in contact with the inner wall of the guide tube 2, which ensures the airtightness between the first turbine 10 and the second turbine 22 and the guide tube 2 to prevent fluid flow.

[0039] Embodiment 3: This embodiment is different from the technical solution of Embodiment 2 in that: Figure 1-Figure 5 , Fig. 9 , Figure 13-Figure 16 The shifting part is installed inside the guide tube 2 and is used for switching between high flow rate test and low flow rate test. The shifting part includes a lane changing assembly and a locking assembly. The lane changing assembly is used to switch the flow path of the fluid inside the guide tube 2.

[0040] The channel changing assembly includes a water inlet cover 16 fixedly installed inside the guide pipe 2 and matched with the fluid inflow docking flange 3, and a water outlet cover 18 fixedly installed inside the guide pipe 2 and matched with the fluid outflow docking flange 3, a water inlet baffle 17 slidably installed inside the water inlet cover 16, a water outlet baffle 19 slidably installed inside the water outlet cover 18, a guide plate 30 matched with the second turbine 22 is fixedly installed between the first lower partition 12 and the second lower partition 13, and the guide plate 30 is connected to the water inlet cover 16 and the water outlet cover 18.

[0041] When performing a high flow test, the water inlet baffle 17 and the water outlet baffle 19 will block the corresponding water inlet cover 16 and the water outlet cover 18. At this time, the fluid in the docking flange 3 can only flow through the first turbine 10 from above the middle partition 11. When performing a low flow test, the water inlet baffle 17 and the water outlet baffle 19 will open the water inlet cover 16 and the water outlet cover 18. At this time, the fluid will flow through the second turbine 22. Since the first turbine 10 will not rotate, the fluid will not flow through the first turbine 10.

[0042] The locking assembly is used to switch the locking of the rear main shaft 20 or the secondary shaft 23. The locking assembly includes a limit slide rail 36 fixedly mounted on the upper part of the first lower partition 12, a sliding frame 37 is slidably mounted on the limit slide rail 36, and a frame body 40 is slidably mounted on the lower part of the second lower partition 13. A connecting block 39 is fixedly mounted on the frame body 40 and the sliding frame 37, and an elastic telescopic rod 38 is fixedly mounted on the two connecting blocks 39. The telescopic ends of the two elastic telescopic rods 38 are fixedly mounted with a corresponding main shaft 20 and the secondary shaft 23. The two blocks 35 operate alternately, and the two blocks 35 are respectively located on both sides of the main shaft 20 symmetrically. When the block 35 of the main shaft 20 abuts against the main shaft 20, the block 35 of the secondary shaft 23 is separated from the secondary shaft 23. A driving mechanism that cooperates with the frame 40, the sliding frame 37, the water inlet baffle 17 and the water outlet baffle 19 is installed on the guide tube 2. The driving mechanism includes a bottom shell 15 fixedly installed at the bottom of the guide tube 2, an electric push rod 21 is fixedly installed inside the bottom shell 15, and a moving frame 34 is slidably installed in the guide tube 2.

[0043] When a high flow test is performed, the main shaft 20 will rotate, and when a low flow test is performed, the secondary shaft 23 will rotate. However, in order to prevent the main shaft 20 and the secondary shaft 23 from affecting each other, it is necessary to lock the secondary shaft 23 during a high flow test and lock the main shaft 20 during a low flow test. The specific operations are as follows: The movement of the movable frame 34 drives the frame body 40 and the sliding frame 37 to move, thereby driving the elastic telescopic rod 38 to move. The movement of the elastic telescopic rod 38 drives the stop block 35 to move. Since the two stop blocks 35 are respectively located on both sides of the main shaft 20 that are symmetrical, when the stop block 35 that matches the main shaft 20 abuts against the main shaft 20, the stop block 35 that matches the secondary shaft 23 just disengages from the secondary shaft 23. At this time, a high flow test is performed and the secondary shaft 23 will not rotate. Otherwise, a low flow test is performed and the main shaft 20 will not rotate.

[0044] The function of the limiting slide rail 36 is to support the sliding frame 37. A plurality of balls cooperating with the sliding frame 37 are rotatably mounted inside the limiting slide rail 36 to reduce friction and make the sliding frame 37 slide more smoothly.

[0045] The driving mechanism includes a bottom shell 15 fixedly installed at the bottom of the guide tube 2, an electric push rod 21 is fixedly installed inside the bottom shell 15, a moving frame 34 is slidably installed in the guide tube 2, the moving frame 34 is fixedly connected to the frame body 40 and the sliding frame 37, two second tooth plates 33 are fixedly installed on the moving frame 34, two gear cylinders 31 meshing with the corresponding second tooth plates 33 are rotatably installed in the guide tube 2, a first tooth plate 32 meshing with the corresponding gear cylinder 31 is fixedly installed on the water inlet baffle 17 and the water outlet baffle 19, and the two first tooth plates 32 are staggered with the corresponding second tooth plates 33.

[0046] The electric push rod 21 can be extended and retracted quickly, and the time interval between the extension and retraction can be ignored, thereby ensuring a quick response to the switching between high and low flow tests and reducing the error of the test caused by the switching.

[0047] The movement of the telescopic end of the electric push rod 21 drives the moving frame 34 to move, thereby driving the second tooth plate 33 to move. The movement of the second tooth plate 33 drives the gear cylinder 31 to rotate. The rotation of the gear cylinder 31 drives the first tooth plate 32 to move, thereby realizing the lifting and lowering of the water inlet baffle 17 and the water outlet baffle 19, so as to switch the flow channel.

[0048] The specific operation steps of this device are as follows: When the flow rate is high, the fluid flows through the guide pipe 2, and the channel changing component blocks the flow channel passing through the second turbine 22. At this time, the fluid drives the first turbine 10 to rotate, and then the speed of the first turbine 10 is counted by the metering component, and the fluid flow rate is calculated by the number of rotations of the first turbine 10; When the flow rate is low, the channel through the first turbine 10 is blocked by the channel changing assembly, so that the fluid passes through the channel of the second turbine 22, which drives the second turbine 22 to rotate, thereby performing low flow rate flow measurement; When measuring a low flow rate, the main shaft 20 is locked by the locking assembly, and when measuring a high flow rate, the secondary shaft 23 is locked by the locking assembly, thereby reducing the influence of the rotation of the main shaft 20 and the secondary shaft 23 on each other.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A water meter measurement performance automatic testing device, comprising a meter body (1), characterized in that: The meter also comprises a flow guide tube (2) fixedly mounted on the bottom of the meter body (1), wherein a main shaft (20) and a secondary shaft (23) are rotatably mounted inside the flow guide tube (2); a testing unit is mounted inside the flow guide tube (2) and is connected to the meter body (1) and is used to test the flow rate of the fluid inside the flow guide tube (2); a sealing assembly is mounted between the flow guide tube (2) and the meter body (1); a high flow rate testing assembly and a low flow rate testing assembly are mounted inside the flow guide tube (2); the high flow rate testing assembly is used for measuring high flow rate fluid; the high flow rate testing assembly comprises a first turbine (10), a low flow rate test assembly is used for measuring low flow rate fluid, the low flow rate test assembly comprises a second turbine (22), a metering assembly matched with the main shaft (20) and the secondary shaft (23) is installed in the meter body (1); a shifting part is installed inside the guide tube (2), and is used for switching between high flow rate test and low flow rate test, the shifting part comprises a channel changing assembly and a locking assembly, the channel changing assembly is used for switching the flow path of the fluid inside the guide tube (2), and the locking assembly is used for locking the main shaft (20) or the secondary shaft (23) after switching.

2. The water meter measurement performance automatic testing equipment according to claim 1 is characterized in that: The sealing assembly comprises a fixed shell (6) fixedly mounted between the flow guide tube (2) and the meter body (1); a top baffle (8) abutting against the top of the first turbine (10) is fixedly mounted on the fixed shell (6); a sealing ring (7) is fixedly mounted between the top baffle (8) and the fixed shell (6); a middle baffle (11) abutting against the bottom of the first turbine (10) is fixedly mounted inside the flow guide tube (2); a gap between the middle baffle (11) and the top baffle (8) is a first turbine chamber; the main shaft (20) passes through and extends to the bottom of the middle baffle (11).

3. The water meter measurement performance automatic testing equipment according to claim 1 is characterized in that: The high flow rate test assembly further comprises a permanent magnet rotating sleeve (14) fixedly mounted in the flow guide tube (2), and the main shaft (20) and the permanent magnet rotating sleeve (14) are connected in a through-and-through manner.

4. The water meter measurement performance automatic testing equipment according to claim 2 is characterized in that: The low flow rate test assembly further comprises a through hole formed on the main shaft (20), a bearing having inner and outer rings being fixedly mounted in the through hole, the outer ring of the bearing being fixedly connected to the main shaft (20), the secondary shaft (23) being fixedly connected to the inner ring of the bearing, a first lower baffle (12) and a second lower baffle (13) being fixedly mounted inside the flow guide tube (2), a second turbine chamber being formed between the first lower baffle (12) and the second lower baffle (13), the second turbine (22) being located in the second turbine chamber, and the top and bottom of the second turbine (22) being respectively in contact with the corresponding first lower baffle (12) and second lower baffle (13), and the secondary shaft (23) passing through and extending to below the second lower baffle (13).

5. The water meter measurement performance automatic testing equipment according to claim 1 is characterized in that: The metering assembly comprises a one-way bearing (29) fixedly mounted on a main shaft (20) and a secondary shaft (23); a first gear ring (26) fixedly mounted on the one-way bearing (29) on the main shaft (20); a second gear ring (28) fixedly mounted on the one-way bearing (29) on the secondary shaft (23); a rear shaft body rotatably mounted on the meter body (1); a first gear (25) meshing with the first gear ring (26) fixedly mounted on the shaft body; and a second gear (27) meshing with the second gear ring (28) fixedly mounted on the shaft body; a rotating induction wheel (24) fixedly mounted on the shaft body; a rotation speed sensor (5) matched with the rotating induction wheel (24) fixedly mounted on the meter body (1); and a conversion module (4) matched with the rotation speed sensor (5) fixedly mounted on the meter body (1).

6. The water meter measurement performance automatic testing equipment according to claim 4 is characterized in that: The guide pipe (2) is fixedly connected with two docking flanges (3), one of which is used for fluid inflow and the other is used for fluid outflow. A baffle (9) is fixedly installed in the guide pipe (2) to match the docking flange (3) for fluid inflow, and the middle partition plate (11) is located in the middle and lower part of the docking flange (3).

7. The water meter measurement performance automatic testing equipment according to claim 6 is characterized in that: The channel changing assembly comprises a water inlet cover (16) fixedly mounted inside the guide pipe (2) and cooperating with the fluid inflow docking flange (3), and a water outlet cover (18) fixedly mounted inside the guide pipe (2) and cooperating with the fluid outflow docking flange (3), a water inlet baffle (17) slidably mounted inside the water inlet cover (16), and a water outlet baffle (19) slidably mounted inside the water outlet cover (18), a guide plate (30) cooperating with the second turbine (22) fixedly mounted between the first lower baffle (12) and the second lower baffle (13), and the guide plate (30) is connected to the water inlet cover (16) and the water outlet cover (18).

8. The water meter measurement performance automatic testing equipment according to claim 7 is characterized in that: The locking assembly comprises a limiting slide rail (36) fixedly mounted on the upper part of the first lower partition (12), a sliding frame (37) slidably mounted on the limiting slide rail (36), a frame body (40) slidably mounted on the lower part of the second lower partition (13), a connecting block (39) fixedly mounted on the frame body (40) and the sliding frame (37), an elastic telescopic rod (38) fixedly mounted on the two connecting blocks (39), and a fixedly mounted elastic telescopic rod (38) at the telescopic ends thereof. The two resisting blocks (35) corresponding to the main shaft (20) and the secondary shaft (23) operate alternately. The two resisting blocks (35) are respectively located on two symmetrical sides of the main shaft (20). When the resisting block (35) matching the main shaft (20) resists against the main shaft (20), the resisting block (35) matching the secondary shaft (23) is separated from the secondary shaft (23). The guide tube (2) is equipped with a driving mechanism matching the frame (40), the sliding frame (37), the water inlet baffle (17) and the water outlet baffle (19).

9. The water meter measurement performance automatic testing equipment according to claim 8 is characterized in that: The driving mechanism comprises a bottom shell (15) fixedly mounted on the bottom of the flow guide tube (2), an electric push rod (21) fixedly mounted inside the bottom shell (15), a moving frame (34) slidably mounted inside the flow guide tube (2), the moving frame (34) being fixedly connected to a frame body (40) and a sliding frame (37), two second tooth plates (33) fixedly mounted on the moving frame (34), two tooth cylinders (31) meshing with corresponding second tooth plates (33) rotatably mounted inside the flow guide tube (2), a first tooth plate (32) meshing with corresponding tooth cylinders (31) fixedly mounted on each of the water inlet baffle (17) and the water outlet baffle (19), the two first tooth plates (32) being staggered with the corresponding second tooth plates (33).

10. A water meter measurement performance automatic testing process, used for the water meter measurement performance automatic testing equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, when the flow rate is high, the fluid flows through the flow guide pipe (2), and the channel changing component blocks the flow channel passing through the second turbine (22). At this time, the fluid drives the first turbine (10) to rotate, and then the metering component counts the rotation speed of the first turbine (10), and the fluid flow rate is calculated by the number of rotations of the first turbine (10); S2, when the flow rate is low, the flow channel passing through the first turbine (10) is blocked by the channel changing component, so that the fluid passes through the flow channel of the second turbine (22), which drives the second turbine (22) to rotate, thereby performing low flow rate flow measurement; S3. When measuring a flow rate at a low flow rate, the main shaft (20) is locked by the locking assembly, and when measuring a flow rate at a high flow rate, the secondary shaft (23) is locked by the locking assembly, thereby reducing the influence of the rotation of the main shaft (20) and the secondary shaft (23) on each other.

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