Calibrating device of fluid flowmeter
By designing the verification device of the liquid flowmeter and using automated installation and verification technology, the problems of low verification efficiency and high operating costs in the existing technology are solved, and a more efficient verification process and lower operating costs are achieved.
Patent Information
- Application Number
- CN202422076814.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-27
AI Technical Summary
During the verification process of existing liquid flowmeters, loading and unloading and verification operations take a long time, resulting in low calibration efficiency and a large number of testing equipment required, increasing operating costs.
A liquid flowmeter verification device is designed, including a frame, a box, a pump body, a conveyor pipe and a clamping mechanism. By setting up three-way valves and three-way connectors on the conveyor pipe, as well as support pipes and telescopic pipes, the automatic installation and verification of the liquid flowmeter is achieved, reducing personnel movement and operating time.
Through automated operations, the labor burden of personnel is significantly reduced, the verification efficiency of liquid flowmeters is improved, and the operation cost is reduced.
Smart Images
Figure CN222938574U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of verification of liquid flow meters, and particularly relates to a verification device for liquid flow meters. Background Art
[0002] A liquid flow meter is a measuring instrument with a wide range of applications, used to measure the flow rate of a fluid over a measured period of time. In industries such as petroleum, chemical, hydropower, food and beverage, and pharmaceuticals, the detection of the flow rate of liquid fluids has become an essential and indispensable part of trade settlement and industrial production. To meet various requirements, different types of liquid flow meters have emerged. These liquid flow meters are further divided into types such as electromagnetic flow meters, differential pressure flow meters, rotor flow meters, throttling flow meters, volumetric flow meters, and ultrasonic flow meters. The main structural components of the flow meter include a main body and flange plates integrally formed on both sides of the main body. During actual installation, the flange plates need to be fixed to the opposite flange plates fixed on the pipeline through bolts to ensure the accurate installation of the flow meter.
[0003] To ensure the production of liquid flow meters that meet the requirements of metrological performance and metrological instrument control, according to the provisions of the "Verification Regulation of Liquid Flow Standard Devices" JJG 164-2000 of the state, to ensure that the products meet the requirements in terms of metrological performance and metrological instrument control, the liquid flow meters produced must be sent to a flow meter verification unit with inspection qualifications for verification. To avoid unqualified products during verification and reduce verification costs, flow meter manufacturers should first conduct internal quality self-inspection on the produced flow meters, and the flow meters that pass the self-inspection are then sent to the flow meter verification unit for verification. For flow meter manufacturers, the metrological performance of liquid flow meters is commonly checked by the standard meter method. The standard meter method verification method uses the pulse counting of the standard meter (standard flow meter) and the meter under test over a period of time, and then calculates the standard flow value and the flow value under test to calculate the error between the two to determine whether the meter under test is qualified. For flow meter manufacturers, the standard meter method is undoubtedly a direct and efficient self-inspection means, so most flow meter manufacturers use the standard meter method for self-inspection operations.
[0004] During the verification process of liquid flow meters, it is often necessary to replace the liquid flow meter to be tested installed on the pipeline of the detection device, that is, to replace it with the next liquid flow meter to be tested, so as to continuously verify multiple liquid flow meters produced. However, the installation of a liquid flow meter depends on the flange plates matching both sides of the liquid flow meter. When installing a liquid flow meter, it is necessary to fix the flange plate to the opposite flange plate on the pipeline through bolts; conversely, when uninstalling a liquid flow meter, it is necessary to first remove the bolts connecting the flange plate to the opposite flange plate fixed on the pipeline. Thus, it can be seen that the loading and unloading operation process of liquid flow meters takes a lot of time, and the verification process also requires recording the pulse counts of the standard flow meter and the meter under test within a certain period of time, resulting in a large amount of time spent on the verification operation of liquid flow meters, making the verification efficiency of liquid flow meters relatively low. To improve the verification efficiency, multiple sets of verification devices are used in combination. That is to say, the assembly personnel repeatedly perform the operation of loading and unloading liquid flow meters on multiple sets of verification devices in sequence. At the same time, the verification and measurement personnel repeatedly operate the valves of multiple verification devices in sequence, so that the medium flows through the liquid flow meter to be tested and the standard flow meter, facilitating the recording of the pulse counts of the standard flow meter and the meter under test within a certain period of time to complete the verification records of multiple sets of verification devices, thereby improving the verification efficiency of liquid flow meters. Although this method improves the verification efficiency, it also means that more detection equipment needs to be invested, which will undoubtedly increase the operating cost. In addition, personnel need to move back and forth between multiple sets of verification devices, which not only increases the labor burden of the personnel but also affects the verification efficiency. Therefore, corresponding optimization and improvement are needed in the verification method of liquid flow meters, which can not only reduce the labor burden of the staff but also improve the efficiency of verifying liquid flow meters. Summary of the Invention
[0005] Aiming at the deficiencies of the prior art, the utility model provides a verification device for liquid flow meters that reduces the labor burden of personnel and improves the efficiency of verifying flow meters, which is used to overcome the defects in the prior art.
[0006] The technical solution adopted by the utility model is as follows: A verification device for a liquid flowmeter, including a frame. On one side of the frame, a box body, a pump body and a delivery pipe are respectively arranged. The input end of the pump body is communicated with the bottom of the box body, the delivery end of the pump body is communicated with the top of the box body through the delivery pipe. Along the direction from the delivery end of the pump body away from the pump body to the input end of the pump body close to the pump body, a standard flowmeter and several clamping mechanisms are sequentially arranged on the delivery pipe; The clamping mechanism includes a three-way valve and a three-way joint arranged on the delivery pipe, a support pipe arranged on the three-way valve, a telescopic pipe hermetically sleeved on one side of the support pipe, a drain pipe arranged on one side of the three-way joint, and a one-way valve arranged on the drain pipe; The liquid outlet end of the one-way valve faces the three-way joint. Both ends of the three-way joint are installed on the delivery pipe, the third end of the three-way joint is installed on one end of the drain pipe, the liquid inlet end of the three-way valve and the first liquid outlet end of the three-way valve are both installed on the delivery pipe, the second liquid outlet end of the three-way valve is installed on one end of the support pipe, and the other end of the support pipe, the other end of the drain pipe and the telescopic pipe are all located on the other side of the frame.
[0007] Preferably, a limit groove is opened on one side of the support pipe close to the telescopic pipe. A screw rod is sleeved in the limit groove. The diameter of the screw rod matches the groove width of the limit groove. One end of the screw rod is installed in the middle of the outer wall of the telescopic pipe. A nut is threadedly sleeved on the screw rod. The telescopic pipe is clamped on the support pipe through the nut.
[0008] Preferably, a sealing groove is opened on one side of the telescopic pipe located inside the support pipe. Sealing packing is filled in the sealing groove. A limit ring is arranged at the bottom end of the sealing groove. The limit ring is installed on the telescopic pipe. The sealing packing is pressed in the sealing groove through the limit ring.
[0009] Preferably, flange plates are sleeved on the end of the telescopic pipe passing through the support pipe and the end of the drain pipe close to the telescopic pipe. A bracket is arranged on the outside of the flange plate. The bracket is installed on the frame. The support pipe and the drain pipe are respectively in contact with the top surface of the bracket.
[0010] Preferably, a control valve is arranged on the support pipe. The control valve is located on the side of the frame where the telescopic pipe is arranged.
[0011] Preferably, a liquid inlet pipe is arranged between the input end of the pump body and the box body. The input end of the pump body is communicated with the bottom of the box body through the liquid inlet pipe. A main valve is arranged on the liquid inlet pipe. The main valve is located on one side of the frame. Reinforcing sleeves are sleeved on the end of the liquid inlet pipe close to the box body and the end of the delivery pipe close to the box body. The reinforcing sleeves are installed on the box body. The inner diameter of the reinforcing sleeve matches the outer shape of the liquid inlet pipe.
[0012] Preferably, a liquid level gauge is vertically arranged on the outside of the box body. The liquid level gauge is communicated with the box body. Sleeve holes are respectively opened at the top and bottom of the box body. A plug cover is press-fitted in the sleeve hole.
[0013] The beneficial effects of the present utility model are as follows: First, by arranging the delivery pipe on one side of the frame, the three-way valve and the three-way joint arranged on the delivery pipe are both located on one side of the frame, and the pump body is located on one side of the frame, thus facilitating the operation of the three-way valve and the pump body on one side of the frame. Since the other end of the drain pipe and the telescopic pipe are both located on the other side of the frame, the liquid flowmeter to be detected is installed between the telescopic pipe and the other end of the drain pipe, thus facilitating the installation operation of the liquid flowmeter on the other side of the frame, and further separating the operation of controlling the three-way valve and the pump body from the installation operation of the liquid flowmeter. Moreover, the present utility model is provided with a plurality of clamping mechanisms to facilitate personnel to repeatedly and continuously perform the operation of controlling the three-way valve and the pump body and the installation operation of the liquid flowmeter on both sides of the frame respectively, so as to reduce personnel movement, thereby reducing the labor burden of personnel and improving the efficiency of calibrating the flowmeter.
[0014] Second, through the limiting groove opened on the support pipe and the screw arranged in the limiting groove, the telescopic pipe is restricted on the support pipe, so that the telescopic pipe can only perform telescopic movement. By threadedly sleeving a nut on the screw, the telescopic pipe can be clamped on the support pipe, thus facilitating the clamping of flowmeters of various sizes between the telescopic pipe and the drain pipe. Moreover, through the arranged limiting ring, the sealing packing is pressed in the sealing groove, thereby sealing the gap between the telescopic pipe and the support pipe to prevent the leakage of liquid medium from the gap between the telescopic pipe and the support pipe.
[0015] Third, through the flange plates sleeved on both the end of the telescopic pipe passing through the support pipe and the end of the drain pipe close to the telescopic pipe, the liquid flowmeter to be detected can be installed between the telescopic pipe and the drain pipe by means of the flange plates. Through the arranged support, the support pipe and the drain pipe are supported to improve the stability of the use of the support pipe and the drain pipe. Moreover, through the arranged control valve, it is convenient to control the flow of the medium in the support pipe. Therefore, when replacing the liquid flowmeter, by closing the control valve, the medium can be prevented from flowing out of the telescopic pipe; through the arranged main valve, the flow of the medium in the box body to the input end of the pump body can be controlled. Therefore, after the calibration operation is completed, by closing the main valve, the medium delivery can be controlled to stop.
[0016] In addition, through the arranged reinforcing sleeve, the connection between the liquid inlet pipe and the delivery pipe and the box body can be strengthened. By arranging a liquid level gauge on the box body, the capacity of the liquid in the box body can be understood. By arranging a plug cover on the box body, it is convenient to add or discharge the medium into the box body. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is the first three-dimensional schematic diagram of the present utility model.
[0018] Figure 2 is the second three-dimensional schematic diagram of the present utility model.
[0019] Figure 3 is Figure 2 The enlarged schematic view at position A in
[0020] Figure 4 is the assembly sectional view of the support pipe and the telescopic pipe. Specific implementation manner
[0021] such as Figures 1 to 4As shown in the figure, a calibration device for a liquid flowmeter includes a frame 1. On one side of the frame 1, a box body 2, a pump body 3, and a delivery pipe 4 are respectively arranged. The input end of the pump body 3 is communicated with the bottom of the box body 2, and the delivery end of the pump body 3 is communicated with the top of the box body 2 through the delivery pipe 4. Along the direction from the delivery end of the pump body 3 away from the pump body 3 to the input end of the pump body 3 close to the pump body 3, a standard flowmeter 5 and a number of clamping mechanisms are sequentially arranged on the delivery pipe 4. The number of clamping mechanisms is arranged at equal intervals on the delivery pipe 4. The clamping mechanism includes a three-way valve 6 and a three-way joint 7 arranged on the delivery pipe 4, a support pipe 8 arranged on the three-way valve 6, a telescopic pipe 9 hermetically sleeved on one side of the support pipe 8, a drain pipe 10 arranged on one side of the three-way joint 7, and a check valve 11 arranged on the drain pipe 10. The liquid outlet end of the check valve 11 faces the three-way joint 7 to prevent the medium in the drain pipe 10 from flowing reversely. Both ends of the three-way joint 7 are installed on the delivery pipe 4, and the third end of the three-way joint 7 is installed on one end of the drain pipe 10. The liquid inlet end and the first liquid outlet end of the three-way valve 6 are both installed on the delivery pipe 4, and the second liquid outlet end of the three-way valve 6 is installed on one end of the support pipe 8. The other end of the support pipe 8, the other end of the drain pipe 10, and the telescopic pipe 9 are all located on the other side of the frame 1. Since the delivery pipe 4 is arranged on one side of the frame 1, the three-way valve 6 and the three-way joint 7 arranged on the delivery pipe 4 are both located on one side of the frame, and the pump body 3 is located on one side of the frame 1 to facilitate the operation of the three-way valve 6 and the pump body 3 on one side of the frame 1. Moreover, the liquid flowmeter to be detected is installed between the other ends of the telescopic pipe 9 and the drain pipe 10, so that the installation operation of the liquid flowmeter is located on the other side of the frame 1, thereby separating the operation of the three-way valve 6 and the pump body 3 from the installation operation of the liquid flowmeter. Through the number of the clamping mechanisms being several, personnel can repeatedly and continuously control the three-way valve 6 and the pump body 3 and install the liquid flowmeter on both sides of the frame 1 respectively, so as to reduce personnel movement, thereby reducing the burden on personnel and improving the efficiency of calibrating the flowmeter. It should be noted that by respectively installing the two ends of the liquid flowmeter on the telescopic pipe 9 and the drain pipe 10, first start the pump body 3, and then adjust the three-way valve 6 so that the medium conveyed in the delivery pipe 4 passes through the support pipe 8, the liquid flowmeter, the drain pipe 10, and the delivery pipe 4 and is conveyed back into the box body 2. By collecting the readings of the standard flowmeter 5 and the liquid flowmeter, it is convenient to complete the calibration operation of the liquid flowmeter. The directions of collecting the readings of the standard flowmeter 5 and the liquid flowmeter are both along the direction from the other side of the frame 1 to one side of the frame 1, so as to facilitate personnel to operate the three-way valve 6 and the pump body 3 while completing the collection of the readings of the standard flowmeter 5 and the liquid flowmeter.
[0022] In this embodiment, a limiting groove 12 is formed on one side of the support pipe 8 close to the telescopic pipe 9. A screw rod 13 is sleeved in the limiting groove 12. The diameter of the screw rod 13 matches the groove width of the limiting groove 12. One end of the screw rod 13 is installed in the middle of the outer wall of the telescopic pipe 9, thereby restricting the telescopic pipe 9 on the support pipe 8, enabling the telescopic pipe 9 to only perform telescopic movement. A nut 14 is threadedly sleeved on the screw rod 13, and the telescopic pipe 9 is clamped on the support pipe 8 through the nut 14. By controlling the movement of the screw rod 13 along the limiting groove 12, the distance between the telescopic pipe 9 and the liquid discharge pipe 10 can be conveniently adjusted to facilitate clamping flow meters of various sizes between the telescopic pipe 9 and the liquid discharge pipe 10.
[0023] Specifically, a sealing groove 15 is formed on one side of the telescopic pipe 9 located inside the support pipe 8. A sealing filler 16 is filled in the sealing groove 15. A limiting ring 17 is arranged at the bottom end of the sealing groove 15. The limiting ring 17 is installed on the telescopic pipe 9, and the sealing filler 16 is pressed in the sealing groove 15 through the limiting ring 17. The gap between the telescopic pipe 9 and the support pipe 8 is sealed by the installed sealing filler 16 to prevent the leakage of liquid medium from the gap between the telescopic pipe 9 and the support pipe 8.
[0024] Please refer to again Figure 2 and 3 , flange plates 18 are sleeved on one end of the telescopic pipe 9 passing through the support pipe 8 and one end of the liquid discharge pipe 10 close to the telescopic pipe 9, enabling the liquid flow meter to be detected to be installed between the telescopic pipe 9 and the liquid discharge pipe 10 by means of the flange plates 18. A bracket 19 is arranged on the outer side of the flange plate 18. The bracket 19 is installed on the frame 1. The support pipe 8 and the liquid discharge pipe 10 are respectively in contact with the top surface of the bracket 19, thereby using the bracket 19 to support the support pipe 8 and the liquid discharge pipe 10 to improve the stability of the use of the support pipe 8 and the liquid discharge pipe 10.
[0025] In this embodiment, a control valve 20 is arranged on the support pipe 8. The control valve 20 is located on one side of the frame 1 where the telescopic pipe 9 is arranged. The control valve 20 is used to control the flow rate of the medium in the support pipe 8; for this reason, when replacing the liquid flow meter, it is convenient to operate the control valve 20. By closing the control valve 20, the inner cavity of the support pipe 8 is closed to avoid the outflow of the medium from the telescopic pipe 9 during the process of replacing the liquid flow meter.
[0026] Specifically, a liquid inlet pipe 21 is provided between the input end of the pump body 3 and the box body 2. The input end of the pump body 3 is connected to the bottom of the box body 2 through the liquid inlet pipe 21. The height of the input end of the pump body 3 is not higher than that of the liquid inlet pipe 21. A main valve 22 is provided on the liquid inlet pipe 21. The main valve 22 is located on one side of the frame 1, so that the main valve 22 can be operated on one side of the frame 1. The main valve 22 is used to control the flow of the medium in the box body 2 to the input end of the pump body 3, so as to control the pump body 3 to convey the medium to the conveying pipe 4. Reinforcing sleeves 23 are sleeved on both the end of the liquid inlet pipe 21 close to the box body 2 and the end of the conveying pipe 4 close to the box body 2. The reinforcing sleeves 23 are installed on the box body 2. The inner diameter of the reinforcing sleeve 23 is matched with the outer shape of the liquid inlet pipe 21, so as to reinforce the connection between the liquid inlet pipe 21 and the conveying pipe 4 and the box body 2.
[0027] Please refer to again Figure 1 , a liquid level gauge 24 is vertically arranged on the outer side of the box body 2. The liquid level gauge 24 is communicated with the box body 2. By observing the liquid level gauge 24, it is convenient to understand the liquid capacity in the box body 2. Sleeve holes are respectively opened at the top and the bottom of the box body 2. A plug cover 25 is press-fitted in the sleeve holes to facilitate adding or discharging the medium into the box body 2.
[0028] The usage method of this product is as follows: As Figures 1 to 4As shown, before use, by observing the reading of the liquid level gauge 24, ensure that the liquid level of the medium in the box body 2 is higher than the liquid inlet pipe 21. If the liquid level of the medium in the box body 1 is too low, add the medium into the box body 2 by opening the plug cover on the top of the box body 2. Instruct the verification record personnel to stand on one side of the rack 1, and then instruct the loading and unloading personnel of the liquid flowmeter to stand on the other side of the rack 1, and place the liquid flowmeter to be detected around the other side of the rack 1 to facilitate the installation of the liquid flowmeter on this product. During use, first, close all the control valves 20, and adjust all the three-way valves 6 so that the liquid inlet end of the three-way valve 6 is communicated with the first liquid outlet end of the three-way valve 6. Then, open the main valve 22 and control the pump body 3 to operate so that the medium in the box body 2 is transported into the conveying pipe 4 through the pump body 3 and then transferred back into the box body 2 through the conveying pipe 4. At the same time, observe whether the standard flowmeter 5 shows a reading. If the standard flowmeter 5 shows a reading, it is considered that the medium is circulating. Otherwise, immediately close the pump body 3 and the main valve 22 and check and maintain this product. Then, if the medium is circulating, the loading and unloading personnel of the liquid flowmeter install multiple liquid flowmeters to be detected on several clamping devices in sequence, that is, install both sides of the liquid flowmeter to be detected on the flange 18 at one end of the telescopic pipe 9 and the flange 18 at one end of the drain pipe 10 respectively, so that the reading direction of the liquid flowmeter faces the verification record personnel. After completing the installation of the liquid flowmeter, open the control valve 20 on one side of the flange 18. Then, the verification record personnel sequentially perform verification operations on the liquid flowmeters installed on several clamping devices, that is, adjust the three-way valve 6 so that the liquid inlet end of the three-way valve 6 is communicated with the second liquid outlet end of the three-way valve 6, that is, the medium in the conveying pipe 4 flows into the support pipe 8, so that the medium flows through the liquid flowmeter installed between the telescopic pipe 9 and the drain pipe 10, causing the liquid flowmeter to show a reading, so as to record the pulse counts of the standard flowmeter and the meter under test for a period of time, thus completing the verification operation of the liquid flowmeter. Finally, the loading and unloading personnel of the liquid flowmeter remove the liquid flowmeter that has completed the verification operation, replace it with the liquid flowmeter to be detected on the other side of the rack 1, and instruct the verification record personnel to repeat the verification operation on one side of the rack 1, so as to sequentially complete the verification operations on multiple liquid flowmeters.
[0029] In this embodiment, the delivery pipe 4 is arranged on one side of the frame 1, so that the three-way valve 6 and the three-way joint 7 arranged on the delivery pipe 4 are both located on one side of the frame, and the pump body 3 is located on one side of the frame 1, thus facilitating the operation of the three-way valve 6 and the pump body 3 on one side of the frame 1. Since the other end of the drain pipe 10 and the telescopic pipe 9 are both located on the other side of the frame 1, the liquid flowmeter to be detected is installed between the telescopic pipe 9 and the other end of the drain pipe 10, thus facilitating the installation operation of the liquid flowmeter on the other side of the frame 1, and further separating the operation of the three-way valve 6 and the pump body 3 from the installation operation of the liquid flowmeter. Moreover, the utility model is provided with a plurality of clamping mechanisms to facilitate the repeated and continuous operation of the three-way valve 6 and the pump body 3 and the installation operation of the liquid flowmeter on both sides of the frame 1 respectively by personnel, so as to reduce the movement of personnel, thereby reducing the labor burden of personnel and improving the efficiency of calibrating the flowmeter.
[0030] The above-described embodiments are only the preferred embodiments of the present utility model, and do not limit the scope of implementation of the present utility model. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent of the present utility model shall be included in the scope of the patent application of the present utility model.
Claims
1. A calibration device for a liquid flow meter, comprising a frame (1), characterized in that: A box body (2), a pump body (3) and a delivery pipe (4) are respectively arranged on one side of the frame (1); the input end of the pump body (3) is connected to the bottom of the box body (2); the delivery end of the pump body (3) is connected to the top of the box body (2) through the delivery pipe (4); and a standard flow meter (5) and a plurality of clamping mechanisms are sequentially arranged on the delivery pipe (4) along the direction from the delivery end away from the pump body (3) to the input end close to the pump body (3); The clamping mechanism comprises a three-way valve (6) and a three-way joint (7) arranged on the delivery pipe (4), a support pipe (8) arranged on the three-way valve (6), a telescopic pipe (9) sealed on one side of the support pipe (8), a discharge pipe (10) arranged on one side of the three-way joint (7), and a one-way valve (11) arranged on the discharge pipe (10); the liquid outlet end of the one-way valve (11) faces the three-way joint (7), both ends of the three-way joint (7) are mounted on the delivery pipe (4), the third end of the three-way joint (7) is mounted on one end of the discharge pipe (10), the liquid inlet end of the three-way valve (6) and the first liquid outlet end of the three-way valve (6) are both mounted on the delivery pipe (4), the second liquid outlet end of the three-way valve (6) is mounted on one end of the support pipe (8), and the other end of the support pipe (8), the other end of the discharge pipe (10) and the telescopic pipe (9) are all located on the other side of the frame (1).
2. The calibration device for a liquid flow meter according to claim 1, characterized in that: The support tube (8) is provided with a limiting groove (12) on one side close to the telescopic tube (9), a screw rod (13) is sleeved in the limiting groove (12), the diameter of the screw rod (13) matches the groove width of the limiting groove (12), one end of the screw rod (13) is mounted on the middle part of the outer wall of the telescopic tube (9), a nut (14) is threadedly sleeved on the screw rod (13), and the telescopic tube (9) is clamped on the support tube (8) by the nut (14).
3. The calibration device for a liquid flow meter according to claim 1, characterized in that: A sealing groove (15) is provided on one side of the telescopic tube (9) located inside the support tube (8), and a sealing filler (16) is filled in the sealing groove (15). A limiting ring (17) is provided at the bottom end of the sealing groove (15), and the limiting ring (17) is mounted on the telescopic tube (9). The sealing filler (16) is pressed into the sealing groove (15) by the limiting ring (17).
4. The calibration device for a liquid flow meter according to claim 1, characterized in that: The end of the telescopic tube (9) passing through the support tube (8) and the end of the discharge tube (10) close to the telescopic tube (9) are both provided with a flange (18). A bracket (19) is provided on the outer side of the flange (18). The bracket (19) is mounted on the frame (1). The support tube (8) and the discharge tube (10) are respectively in contact with the top surface of the bracket (19).
5. The calibration device for a liquid flow meter according to claim 1, characterized in that: The support tube (8) is provided with a control valve (20), and the control valve (20) is located on a side of the frame (1) on which the telescopic tube (9) is provided.
6. The calibration device for a liquid flow meter according to claim 1, characterized in that: A liquid inlet pipe (21) is provided between the input end of the pump body (3) and the box body (2); the input end of the pump body (3) is connected to the bottom of the box body (2) through the liquid inlet pipe (21); a main valve (22) is provided on the liquid inlet pipe (21); the main valve (22) is located on one side of the frame (1); one end of the liquid inlet pipe (21) close to the box body (2) and one end of the delivery pipe (4) close to the box body (2) are both provided with a reinforcement sleeve (23); the reinforcement sleeve (23) is installed on the box body (2); the inner diameter of the reinforcement sleeve (23) matches the outer shape of the liquid inlet pipe (21).
7. The calibration device for a liquid flow meter according to claim 1, characterized in that: A liquid level gauge (24) is vertically arranged on the outer side of the box body (2), and the liquid level gauge (24) is connected to the box body (2). The top of the box body (2) and the bottom of the box body (2) are respectively provided with sleeve holes, and plug covers (25) are interference fit in the sleeve holes.