Water meter calibrating device and calibrating method

Abstract

The invention belongs to the technical field of metering, and particularly discloses a water meter calibrating device and a calibrating method.The water meter calibrating device comprises a placing mechanism, a connecting mechanism and a detecting mechanism; the placing mechanism comprises a plurality of placing tables arranged in parallel, and the placing tables are used for placing water meters; the detection mechanism comprises a water inlet pipe, a water outlet pipe and two detectors mounted on the water inlet pipe and the water outlet pipe respectively; each connecting mechanism comprises a fixed pipe, two sliding pipes which are slidably connected to the two sides of the fixed pipe in the axial direction of the fixed pipe and conical pipes communicating with the ends of the sliding pipes, and sealing pieces are arranged on the inner walls of the conical pipes; the fixing pipes are communicated with emptying pipes, and emptying valves are installed in the emptying pipes. At least one fixing pipe is provided with a barometer. By the adoption of the scheme, the problems that when a plurality of water meters are connected in series or in parallel, manual connection affects the verification efficiency, and a certain connecting position is inevitably poor in sealing effect and affects the verification result can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of measurement, and in particular relates to a water meter calibration device and a calibration method. Background Art

[0002] A water meter is an instrument used to continuously measure, record and display the volume of water flowing through the measuring sensor under measurement conditions. A water meter is the main measuring instrument for water supply companies to sell water. Its measurement accuracy is a key indicator for measuring the quality of water meters, which will directly affect the vital interests of water supply companies and water users. For this reason, water meters need to be calibrated before leaving the factory. In order to improve the calibration efficiency, in the existing technology, multiple water meters are usually connected in series or in parallel, and water is passed through multiple water meters at the same time, so that calibration can be performed synchronously to improve calibration efficiency.

[0003] However, when multiple water meters are connected in series or in parallel, they need to be connected in sequence through pipes. Manual connection affects the efficiency of verification. When many water meters are connected at the same time, it is inevitable that the sealing effect of a certain connection is insufficient, which will affect the verification results. In addition, after multiple water meters are connected through pipes, there is air in the pipes. When verifying the water meters, water needs to be passed through for a period of time to allow the air to be exhausted, otherwise it will affect the verification results. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a water meter calibration device and a calibration method to solve the problem that when multiple water meters are connected in series or in parallel, they need to be connected in sequence through pipes, and manual connection affects the calibration efficiency. When there are many water meters connected at the same time, it is inevitable that the sealing effect of a certain connection is insufficient, which will affect the calibration result.

[0005] According to an embodiment of the present invention, the present invention adopts the following technical solution:

[0006] A water meter calibration device comprises a placing mechanism, a connecting mechanism and a detecting mechanism; the placing mechanism comprises a plurality of placing tables arranged in parallel, the placing tables being used to place water meters; the detecting mechanism comprises an inlet pipe, an outlet pipe and two detecting instruments respectively installed on the inlet pipe and the outlet pipe, the inlet pipe being provided with an inlet valve, the outlet pipe being provided with an outlet valve; a plurality of connecting mechanisms are provided, and are respectively located between adjacent placing tables or between the placing tables and the inlet pipe or between the placing tables and the outlet pipe, the connecting mechanism being used to connect the inlet pipe, the water meters on the plurality of placing tables and the outlet pipes in series in sequence; the connecting mechanism comprises a fixed pipe, two groups of sliding pipes respectively connected to both sides of the fixed pipe axially slidingly along the fixed pipe, and a tapered pipe connected to the end of the sliding pipe, the large diameter end of the tapered pipe being its free end, and a sealing member being provided on the inner wall of the tapered pipe; the fixed pipes are all connected with an exhaust pipe, the exhaust pipe being provided with an exhaust valve; at least one fixed pipe is provided with a barometer.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] In this solution, multiple water meters are connected through a connecting mechanism. After the water meters are placed on a placement table, the sliding tube can be slid so that the conical tube sleeve is arranged on the water inlet end, water outlet end or the outside of the water inlet pipe or water outlet pipe (hereinafter collectively referred to as the connecting pipe) of the water meter. The end of the connecting pipe is inserted into the conical tube and abutted against the inner wall of the conical tube, and is sealed by a sealing member to complete the automatic assembly.

[0009] The large diameter end of the tapered tube is its free end. During assembly, the tapered tube sleeve is arranged on the outside of the connecting pipe. Compared with setting the small diameter end of the tapered tube as the free end and inserting the tapered tube into the connecting pipe, this avoids the problem of water flow remaining between the small diameter end of the tapered tube and the inner wall of the connecting pipe, thereby affecting the test results.

[0010] By setting up the exhaust pipe, it is convenient to remove the air in the connecting mechanism and each connecting pipe by vacuuming to avoid the air affecting the calibration results. In addition, the air pressure in each pipe is tested by a pressure gauge. On the one hand, it can be judged whether the vacuuming is completed. On the other hand, if the value of the pressure gauge is slow to reach the specified range, it means that the joints of some pipes have insufficient sealing effect, resulting in outside air entering each pipe. This can remind the staff to conduct inspection to avoid the situation where water leakage at the pipe joints affects the calibration results during the calibration process.

[0011] Furthermore, the detection mechanism also includes a circulating water tank, and the water inlet pipe and the water outlet pipe are both connected to the circulating water tank.

[0012] Furthermore, the placement mechanism also includes a positioning member for positioning the water meter, the positioning member includes two clamps relatively slidably arranged on the placement table, the clamps are used to clamp the water meter; a detection member for detecting whether the water meter is properly placed is installed above the placement table.

[0013] Furthermore, the placement table is arranged to rotate; the placement mechanism also includes a straightening controller, a signal input end of the straightening controller is used to receive a detection signal from the detection member, and a signal output end of the straightening controller is used to control the rotation of the placement table.

[0014] Furthermore, the sealing member comprises a plurality of sealing rings fixed on the inner wall of the tapered tube along the axial direction of the tapered tube, the inner diameters of the plurality of sealing rings being consistent and consistent with the inner diameter of the small diameter end of the tapered tube; annular airbags are fixed between adjacent sealing rings, and a plurality of air holes respectively connected to the annular airbags are opened on the outer wall of the tapered tube.

[0015] Furthermore, regulating valves are installed in the fixed pipes.

[0016] Furthermore, the connecting mechanism also includes a bracket for installing the fixed pipe, the bracket includes a slidably arranged base plate and a telescopic rod slidably connected to the base plate, and the sliding direction of the base plate, the sliding direction of the telescopic rod, and the telescopic direction of the telescopic rod are perpendicular to each other.

[0017] Furthermore, a flexible sheet is bonded to the large diameter end of the tapered tube.

[0018] Furthermore, a transparent cover for covering the outside of the conical tube is slidably connected to the sliding tube.

[0019] According to the embodiment of the present invention, the present invention also adopts the following technical solution:

[0020] The water meter calibration method, using the water meter calibration device mentioned above, comprises the following steps:

[0021] S1. placing a plurality of water meters on a plurality of placement tables respectively;

[0022] S2, connecting the water inlet pipe, multiple water meters, and the water outlet pipe in sequence through the connecting mechanism to form a detection path;

[0023] S3. Close the water inlet valve and the water outlet valve, open the drain valve, evacuate the drain pipe, and record the pressure value of the pressure gauge. When the pressure values ​​of the pressure gauge reach the specified range, close the drain valve, open the water inlet valve and the water outlet valve, and pass water into the detection passage. When the pressure value of the pressure gauge cannot reach the specified range within a certain period of time, there are connection nodes with insufficient sealing effect in the detection passage. Check and eliminate the problem, and then pass water into the detection passage.

[0024] S4. Determine the measurement accuracy of the water meter based on the readings of the detectors on the water inlet and outlet pipes and each water meter.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In this scheme, the air in the connecting mechanism and each connecting pipe is removed by vacuuming to prevent the air from affecting the calibration results. In addition, the air pressure in each pipe is tested by a pressure gauge. On the one hand, it can be determined whether the vacuuming is completed. On the other hand, if the value of the pressure gauge is slow to reach the specified range, it means that the joints of some pipes have insufficient sealing effects, resulting in outside air entering the pipes. This can remind the staff to conduct inspections to avoid water leakage at the pipe connections during the calibration process that affects the calibration results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0028] Figure 2Schematic diagram of the connection structure in an embodiment of the present invention.

[0029] Figure 3 for Figure 2 Enlarged view of part A.

[0030] Figure 4 Schematic diagram of the structure of the flexible sheet and the transparent cover in the embodiment of the present invention.

[0031] In the figure: 1. circulating water tank; 2. water inlet pipe; 3. detector; 4. conical tube; 5. sliding tube; 6. fixed tube; 7. bottom plate; 8. placing table; 9. clamping plate; 10. water meter; 11. water outlet pipe; 12. drain pipe; 13. telescopic rod; 14. air hole; 15. sealing ring; 16. annular air bag; 17. connecting pipe; 18. flexible sheet; 19. transparent cover. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings, and specific implementation methods are given.

[0033] like Figure 1 As shown, the water meter calibration device includes a frame, and the frame is provided with a placing mechanism, a connecting mechanism and a detecting mechanism.

[0034] The placement mechanism includes a plurality of placement tables 8 arranged in parallel. Figure 1 As shown in the figure, two placement tables 8 are placed side by side in the horizontal direction as an example. The placement tables 8 are used to place water meters 10. In this embodiment, only one detection passage is set, and the placement tables 8 are also only set in a row in parallel. In the actual design process, multiple detection passages can also be set, and the placement tables 8 need to be arranged in a matrix.

[0035] The detection mechanism includes an inlet pipe 2, an outlet pipe 11, and two detectors 3 respectively installed on the inlet pipe 2 and the outlet pipe 11. An inlet valve is installed in the inlet pipe 2, and an outlet valve is installed in the outlet pipe 11. In this embodiment, taking the case where only one detection passage is provided as an example, only one inlet pipe 2 and one outlet pipe 11 are provided. In the actual design process, multiple detection passages can also be provided, and each detection passage requires one inlet pipe 2 and one outlet pipe 11. The detector 3 uses a standard instrument for detecting water flow, such as a high-precision flow meter or other instrument that can detect water flow. The detector 3 is installed on both the inlet pipe 2 and the outlet pipe 11, so that the inlet flow and the outlet flow can be detected respectively, and then compared with the readings of multiple water meters 10, so as to avoid residual or leakage in the process of water flowing through multiple water meters 10, and improve the accuracy of the test results. The detection mechanism also includes a circulating water tank 1. The water inlet pipe 2 and the water outlet pipe 11 are both connected to the circulating water tank 1. The water flow is circulated through the water tank to reduce the waste of water resources. In the actual design process, a circulating pump can be installed on the water inlet pipe 2 or the water outlet pipe 11 to achieve water circulation.

[0036] The connection mechanism is set up in multiple groups. Figure 1 Taking three groups of connecting mechanisms as an example, the three groups of connecting mechanisms are respectively located between adjacent placement platforms 8 or between the placement platforms 8 and the water inlet pipe 2 or between the placement platforms 8 and the water outlet pipe 11. The connecting mechanisms are used to connect the water inlet pipe 2, water meters 10 on multiple placement platforms 8, and the water outlet pipe 11 in series in sequence. In the following text, the water inlet pipe 2, the water inlet end of the water meter 10, the water outlet end of the water meter 10, and the water outlet pipe 11 are collectively referred to as connecting pipes 17.

[0037] Specific, combined Figure 2 , Figure 3 As shown, the connecting mechanism includes a fixed tube 6, two groups of sliding tubes 5 respectively connected to both sides of the fixed tube 6 along the axial direction of the fixed tube 6, and a tapered tube 4 connected to the end of the sliding tube 5, the large diameter end of the tapered tube 4 is its free end, the tapered tube 4 is used to adapt to connecting pipes 17 of various outer diameters (the outer diameter of the connecting pipe 17 needs to be between the inner diameter of the small diameter end of the tapered tube 4 and the inner diameter of the large diameter end of the tapered tube 4), and is sleeved on the outside of the connecting pipe 17 to complete the connection with the connecting pipe 17, the tapered tube 4 is fixed on the sliding tube 5, and a cylinder for driving the sliding tube 5 to slide is installed on the fixed tube 6.

[0038] Combination Figure 3As shown, a seal is provided on the inner wall of the conical tube 4. After the end of the connecting pipe 17 is inserted into the conical tube 4, it contacts the seal on the inner wall of the conical tube 4, and the connection between the connecting pipe 17 and the conical tube 4 is sealed by the seal. Specifically, the seal includes a plurality of sealing rings 15 fixed to the inner wall of the conical tube 4 along the axial direction of the conical tube 4. The inner diameters of the plurality of sealing rings 15 are consistent and consistent with the inner diameter of the small diameter end of the conical tube 4. The sealing ring 15 is made of flexible rubber and can be deformed. When the end of the connecting pipe 17 is inserted into the conical tube 4, the inner side of the sealing ring 15 is deformed and clamped on the outer side of the connecting pipe 17. The design of the plurality of sealing rings 15 can adapt to the connecting pipes 17 with different outer diameters to improve the sealing effect.

[0039] An annular airbag 16 is fixed between adjacent sealing rings 15, and a plurality of air holes 14 are provided on the outer wall of the tapered tube 4, which are respectively connected to the annular airbags 16. After the end of the connecting pipe 17 is pressed against the inner wall of the tapered tube 4, air is ventilated into the plurality of annular airbags 16 through the air holes 14, so that the annular airbags 16 are expanded to fill the space between the adjacent sealing rings 15, and the expanded annular airbags 16 can further press the deformed sealing rings 15 against the outer wall of the connecting pipe 17, further improving the sealing effect. The annular airbag 16 near the end of the connecting pipe 17 can completely block the gap between the end of the connecting pipe 17 and the inner wall of the tapered tube 4 after expansion, thereby achieving a better sealing effect. In the actual design process, the plurality of air holes 14 on the tapered tube 4 can be connected to an air pipe, which is connected to an air pump through the air pipe, so as to facilitate ventilation or exhaust of the annular airbag 16 through the air pump.

[0040] The fixed pipes 6 are all connected with an exhaust pipe 12, and an exhaust valve is installed in the exhaust pipe 12. In the actual assembly process, the exhaust pipes 12 are all connected to the vacuum pump, and the vacuum pump is used to evacuate the pipes of the connecting mechanism and each connecting pipe 17. At least one fixed pipe 6 is installed with a pressure gauge, and the pressure gauge is a pressure gauge that can detect the air pressure in the pipe in the prior art. In the actual design process, a pressure gauge can be installed on each fixed pipe 6. A regulating valve is installed in each fixed pipe 6. Specifically, the regulating valve is a flow regulating valve to control the water flow in the pipe, so as to facilitate the detection of the accuracy of the reading of the water meter 10 under different water flow rates.

[0041] In another embodiment of the present invention, when the staff places multiple water meters 10 on the placement table 8 respectively, it is inevitable that the water meters 10 are placed in the wrong direction, for example, the water outlet end of the water meter 10 is placed towards the water inlet pipe 2. Therefore, in this embodiment, the placement mechanism also includes a positioning member for positioning the water meter 10, and the positioning member includes two clamps 9 relatively slidably arranged on the placement table 8, the clamps 9 are used to clamp the water meter 10, and a cylinder for driving the clamps 9 to slide is installed on the placement table 8. As long as the water meter 10 is placed between the two clamps 9 and the two clamps 9 are synchronously driven to slide relative to each other, when the two clamps 9 are both against the water meter 10, the two clamps 9 slide the same distance, and the water meter 10 can be pushed to the center of the placement table 8 and clamped. The water meter 10 is clamped by the clamps 9 to prevent the water meter 10 from moving when the connecting mechanism is connected to the water meter 10.

[0042] A detection member for detecting whether the water meter 10 is properly placed is installed above the placement table 8. In this embodiment, two design methods of the detection member are provided. In the actual design process, one of them can be selected according to the needs:

[0043] 1. The detection part uses a camera to take a photo of the water meter 10 on the platform 8 below it, and compares the photo with the photo of the water meter 10 when it is aligned, so as to determine whether the water meter 10 is aligned;

[0044] 2. Since the water meter 10 has different positive and negative directions, some structures on the water meter 10 are different. For example, a certain point on the water meter 10 is selected as the detection point, and a distance sensor is selected as the detection component. When the water meter 10 is in the correct direction, the distance sensor can detect that the distance of the detection point on the water meter 10 is the set value. When the water meter 10 is in the reverse direction, the distance sensor will detect the distance of other points on the water meter 10 or directly detect the distance of the placement table 8, and cannot obtain the set value, thereby judging whether the water meter 10 is placed correctly.

[0045] When the detection component detects that the water meter 10 is not aligned properly, it can prompt the staff to handle the problem through alarm signals such as sound and light.

[0046] In another embodiment of the present invention, in order to facilitate the alignment of the water meter 10 that is not aligned, the placement table 8 is rotatably connected to the frame, and the placement mechanism also includes a motor for driving the placement table 8 to rotate. The placement mechanism also includes an alignment controller, and the alignment controller can be a controller controlled by a program such as a PLC in the prior art. The signal input end of the alignment controller is used to receive the detection signal of the detection element, and the signal output end of the alignment controller is used to control the rotation of the placement table 8. When the detection element detects that the water meter 10 is not aligned, the signal is transmitted to the alignment controller, and the alignment controller controls the motor to start, driving the placement table 8 to rotate 180°, so that the reversed water meter 10 can be aligned.

[0047] In another embodiment of the present invention, in order to facilitate the calibration of water meters 10 of different models, Figure 2 As shown, the connecting mechanism also includes a bracket for installing the fixed pipe 6, the bracket includes a base plate 7 slidably connected to the frame and a telescopic rod 13 slidably connected to the base plate 7, the sliding direction of the base plate 7, the sliding direction of the telescopic rod 13, and the telescopic direction of the telescopic rod 13 are perpendicular to each other, the telescopic rod 13 uses an electric telescopic rod in the prior art or other rods with telescopic function, the bracket also includes a cylinder for driving the base plate 7 to slide, and the base plate 7 is installed with a cylinder for driving the telescopic rod 13 to slide.

[0048] In this embodiment, the position of the fixed tube 6 can be adjusted in space by sliding the bottom plate 7 , sliding the telescopic rod 13 , and extending and retracting the telescopic rod 13 , so that the tapered tube 4 can be aligned with each connecting pipe 17 for assembly.

[0049] In another embodiment of the present invention, in order to facilitate the rapid identification of pipeline connections with insufficient sealing effects, Figure 4 As shown, the large diameter end of the conical tube 4 is bonded with a flexible sheet 18. Specifically, the flexible sheet 18 can be made of soft materials such as paper sheets and cloth strips, so that it can swing under the action of gas flow. In order to prevent the flexible sheet 18 from being blown by the external wind, a transparent cover 19 for covering the outside of the conical tube 4 is vertically slidably connected to the upper edge of the sliding tube 5. Specifically, an electric telescopic rod in the prior art is connected between the transparent cover 19 and the sliding tube 5. The electric telescopic rod drives the transparent cover 19 to move vertically. After the conical tube 4 and each connecting pipe 17 are assembled, the transparent cover 19 is slid so that the transparent cover 19 is covered on the outside of the conical tube 4. When the fixed tube 6 and each connecting pipe 17 are evacuated, if the connection between the conical tube 4 and the connecting pipe 17 is not completely sealed, a certain negative pressure will be generated in the conical tube 4, attracting the flexible sheet 18 to swing toward the inside of the conical tube 4, so that the connection node that is not completely sealed can be quickly found for processing.

[0050] The water meter calibration method, using the water meter calibration device mentioned above, comprises the following steps:

[0051] S1. Place a plurality of water meters 10 on a plurality of placement tables 8 respectively, synchronously drive the clamping plates 9 on the placement tables 8 to slide to clamp the water meters 10, and then use a detection component to detect whether the water meters 10 are aligned. If the water meters 10 are not aligned, rotate the placement tables 8 to align them.

[0052] S2. According to the model of the water meter 10, the position of the fixed pipe 6 is adjusted in advance so that the tapered pipe 4 can be aligned with each connecting pipe 17, and then the water inlet pipe 2, multiple water meters 10, and the water outlet pipe 11 are sequentially connected through the connecting mechanism to form a detection path. Specifically, the sliding pipe 5 is driven by the cylinder to slide, and the sliding pipe 5 drives the tapered pipe 4 to slide until the ends of each connecting pipe 17 are inserted into the tapered pipe 4 and abut against the inner wall of the tapered pipe 4.

[0053] Then, air is ventilated into each air hole 14 through an air pump, and the gas enters the annular airbag 16. The annular airbag 16 expands and cooperates with the sealing ring 15 to press against the outer wall of the connecting pipe 17 and seal the gap between the end of the connecting pipe 17 and the inner wall of the tapered tube 4. The assembly is completed, and then the transparent cover 19 is driven to slide, and the cover is set on the outside of the tapered tube 4.

[0054] S3. Close the water inlet valve and the water outlet valve, open the drain valve, evacuate the drain pipe 12 by using a vacuum pump, and record the pressure value of the barometer. Within the specified time, when the pressure values ​​of the barometer reach the specified range, it can be said that the air in each pipeline is emptied. Close the drain valve, open the water inlet valve and the water outlet valve, and pass water into the detection passage.

[0055] When the pressure value of the barometer cannot reach the specified range within a certain period of time, there are connection nodes with insufficient sealing effect in the detection passage. The staff needs to check each connection node and eliminate the problem. Specifically, by observing whether the flexible sheet 18 is deflected toward the conical tube 4 due to negative pressure, it can be preliminarily determined whether there is a problem at the connection node. The staff reassembles the connection node with insufficient sealing and then passes water into the detection passage.

[0056] S4, water flows into the detection passage, passes through the water inlet pipe 2, multiple water meters 10 and the water outlet pipe 11 in sequence, and the measurement accuracy of the water meter 10 is determined based on the readings of the detector 3 on the water inlet pipe 2, the water outlet pipe 11 and each water meter 10.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A water meter calibration device, characterized in that: It includes a placement mechanism, a connection mechanism and a detection mechanism; The placing mechanism comprises a plurality of placing tables arranged in parallel, and the placing tables are used for placing the water meter; The detection mechanism includes a water inlet pipe, a water outlet pipe and two detectors respectively installed on the water inlet pipe and the water outlet pipe. A water inlet valve is installed in the water inlet pipe, and a water outlet valve is installed in the water outlet pipe. A plurality of connection mechanisms are provided and are respectively located between adjacent placement platforms or between a placement platform and a water inlet pipe or between a placement platform and a water outlet pipe. The connection mechanisms are used to sequentially connect the water inlet pipe, water meters on a plurality of placement platforms, and the water outlet pipe in series; the connection mechanisms include a fixed pipe, two groups of sliding pipes respectively connected to both sides of the fixed pipe along the axial direction of the fixed pipe, and a tapered pipe connected to the end of the sliding pipe, the large diameter end of the tapered pipe being a free end, and a sealing member being provided on the inner wall of the tapered pipe; The fixed pipes are all connected with drain pipes, and drain valves are installed in the drain pipes; and at least one fixed pipe is installed with an air pressure gauge.

2. The water meter calibration device according to claim 1, characterized in that: The detection mechanism also includes a circulating water tank, and a water inlet pipe and a water outlet pipe are both connected to the circulating water tank.

3. The water meter calibration device according to claim 1, characterized in that: The placement mechanism also includes a positioning member for positioning the water meter, the positioning member includes two clamping plates relatively slidably arranged on the placement table, the clamping plates are used to clamp the water meter; a detection member for detecting whether the water meter is properly placed is installed above the placement table.

4. The water meter calibration device according to claim 3, characterized in that: The placement table is arranged to rotate; the placement mechanism also includes a straightening controller, a signal input end of the straightening controller is used to receive a detection signal of the detection member, and a signal output end of the straightening controller is used to control the rotation of the placement table.

5. The water meter calibration device according to claim 1, characterized in that: The sealing member comprises a plurality of sealing rings fixed on the inner wall of the tapered tube along the axial direction of the tapered tube, the inner diameters of the plurality of sealing rings are consistent and are consistent with the inner diameter of the small diameter end of the tapered tube; annular airbags are fixed between adjacent sealing rings, and a plurality of air holes respectively connected to the annular airbags are opened on the outer wall of the tapered tube.

6. The water meter calibration device according to claim 1, characterized in that: A regulating valve is installed in each of the fixed pipes.

7. The water meter calibration device according to claim 1, characterized in that: The connection mechanism also includes a bracket for installing the fixed pipe, the bracket includes a slidably arranged bottom plate and a telescopic rod slidably connected to the bottom plate, and the sliding direction of the bottom plate, the sliding direction of the telescopic rod, and the telescopic direction of the telescopic rod are perpendicular to each other.

8. The water meter calibration device according to claim 1, characterized in that: A flexible sheet is bonded to the large diameter end of the tapered tube.

9. The water meter calibration device according to claim 8, characterized in that: The sliding tube is slidably connected with a transparent cover for covering the outside of the conical tube.

10. A water meter verification method, characterized in that: Using the water meter calibration device according to any one of claims 1 to 9 comprises the following steps: S1. placing a plurality of water meters on a plurality of placement tables respectively; S2, connecting the water inlet pipe, multiple water meters, and the water outlet pipe in sequence through the connecting mechanism to form a detection path; S3. Close the water inlet valve and the water outlet valve, open the drain valve, evacuate the drain pipe, and record the pressure value of the pressure gauge. When the pressure values ​​of the pressure gauge reach the specified range, close the drain valve, open the water inlet valve and the water outlet valve, and pass water into the detection passage. When the pressure value of the pressure gauge cannot reach the specified range within a certain period of time, there are connection nodes with insufficient sealing effect in the detection passage. Check and eliminate the problem, and then pass water into the detection passage. S4. Determine the measurement accuracy of the water meter based on the readings of the detectors on the water inlet and outlet pipes and each water meter.

Images