Test tool for fixed time delay of ultrasonic flowmeter
By designing a test tool for fixed delay of ultrasonic flowmeters, the number of intermediate rings is used to control the length, the problem of detection difficulties of large-diameter and non-circular tube flowmeters is solved, and high accuracy and low-cost detection effects are achieved.
Patent Information
- Application Number
- CN202421838663.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing ultrasonic flowmeter detection methods have difficulties in detecting large-diameter pipelines and non-circular tube flow meters, and the actual flow calibration cost is high, which cannot meet the needs of large-scale factory inspection.
A test tool for fixed delay of ultrasonic flowmeter is designed to change the length by accurately controlling the number of intermediate rings to avoid uncertainty in the test sound speed, thereby achieving accurate detection of ultrasonic flowmeter.
Through the fixed delay test method, this test tool can effectively avoid sound speed uncertainty, improve detection accuracy, and reduce detection costs. It is suitable for the inspection of large-diameter and non-circular tube flowmeters.
Smart Images
Figure CN222895790U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ultrasonic flowmeters, and more specifically to a testing tool for fixing delay of ultrasonic flowmeters. Background Art
[0002] Ultrasonic flowmeters are widely used in the field of flow measurement, especially in large-diameter pipeline water flow (such as hydropower stations), square culvert flow and open channel flow measurement, and have become the main measurement method. The accuracy of the flowmeter is often the technical indicator that users are most concerned about. The detection methods for the measurement performance of ultrasonic flowmeters usually include two categories: real flow calibration and non-real flow calibration.
[0003] Real-flow calibration is currently a more common detection method. It uses a flow standard device to generate and obtain a standard flow signal, and then performs detection by comparing it with the indication of the flow meter being measured. This method has high accuracy, but it is limited by the measurement range and installation conditions of the flow standard device. Generally, it cannot be used to detect flow meters with a pipe diameter exceeding 3m, flow meters that require on-site installation of transducers, and non-circular tube flow meters. In addition, real-flow calibration needs to be carried out in a laboratory, which is relatively expensive, and puts a lot of economic pressure on flow meter manufacturers to conduct large-scale factory inspections.
[0004] Non-real flow calibration is an ultrasonic flow meter detection technology developed in recent years. It includes the detection of multiple physical quantities that affect the metering accuracy of the flow meter. It detects and calibrates the flow meter by calibrating the various components in the ultrasonic flow meter calculation formula and the accuracy of the calculation formula. The components that need to be calibrated include the average ultrasonic propagation time, the delay in the probe wedge, and the timing system delay, which are the main sources of measurement errors in the average ultrasonic propagation time.
[0005] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content
[0006] The utility model aims to provide a test fixture for a fixed delay of an ultrasonic flowmeter, which avoids the uncertainty of the test sound velocity through the accuracy of the length.
[0007] The utility model provides a test fixture for fixing delay of an ultrasonic flowmeter, comprising a left bracket, a right bracket, an intermediate ring, a clamping screw and an ultrasonic probe; a housing cavity is provided in the middle of the left bracket and the right bracket, and the housing cavity comprises a probe housing cavity and a screw housing cavity; one end of the probe housing cavity passes through the inner surface of the left bracket and the right bracket, and the other end of the probe housing cavity is connected to the screw housing cavity, one end of the screw housing cavity passes through the outer surface of the left bracket and the right bracket, and an internal thread matching the clamping screw is provided on the inner wall of the screw housing cavity; a wire hole is provided on the clamping screw; the ultrasonic probe is located in the probe housing cavity, the head of the ultrasonic probe points to the inside of the left bracket and the right bracket, the wire at the tail of the ultrasonic probe passes through the wire hole, and the clamping screw is located in the screw housing cavity to clamp the ultrasonic probe; a plurality of the intermediate rings are sequentially stacked and connected between the left bracket and the right bracket.
[0008] Furthermore, the intermediate ring is in a circular ring shape, and a plug is provided on the side of one end of the intermediate ring, and a bayonet is provided at the bottom of the plug; a socket matching with the plug is provided on the inner wall of the other end of the intermediate ring, and a clamp is provided at the edge of the socket; a socket is provided on the bottom surface of the left bracket, and a clamp is provided at the edge of the socket; a plug is provided on the bottom surface of the right bracket, and a bayonet is provided at the bottom of the plug; the plug of one of the multiple intermediate rings is inserted into the socket on the bottom surface of the left bracket, and the plug of another intermediate ring is inserted into the socket of the intermediate ring, until the plug of the last intermediate ring is inserted into the socket of the second to last intermediate ring; the plug on the bottom surface of the right bracket is inserted into the socket of the last intermediate ring, and the clamp in the socket is correspondingly clamped in the bayonet on the plug inserted into the socket.
[0009] Furthermore, four intermediate rings are sequentially stacked and connected between the left bracket and the right bracket.
[0010] Furthermore, the ultrasonic probe located on the left bracket and the ultrasonic probe located on the right bracket point to each other.
[0011] Furthermore, the axis of the probe accommodating cavity, the axis of the screw accommodating cavity and the axis of the intermediate ring are located on the same straight line.
[0012] Furthermore, the distance between adjacent middle ring end faces is 20 mm.
[0013] The utility model also provides a testing method, which is applied to the above-mentioned ultrasonic flow meter fixed delay testing tool.
[0014] Furthermore, the testing method comprises the following steps:
[0015] S1: The preset sound speed is C, the distance between the adjacent intermediate ring end faces is L, and the theoretical time is T = L / C;
[0016] S2: The actual measured time is Tr;
[0017] S3: When different distances are selected, the value of Tr-T remains unchanged;
[0018] S4: define the value of Tr-T as the intrinsic delay T0;
[0019] S5: Use length L as the length to measure time T1, use length 2L as the length to measure T2, and calculate the inherent delay as 2*T2-T1.
[0020] The utility model discloses a test fixture for ultrasonic flow meter with fixed delay. When assuming that the sound speed is C, the distance is L, and the theoretical time is T=L / C, the actual measured time is Tr. When taking different distances in the experiment, it is found that the value of Tr-T is fixed and unchanged. This is defined as the inherent delay T0 (caused by the circuit). If the length L is used as the length to measure the time T1, and the length 2L is used as the length to measure the time T2, the inherent delay is calculated to be 2*T2-T1. Therefore, the length can be changed by the number of intermediate rings, and the uncertainty of the test sound speed can be avoided by the accuracy of the length. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 A schematic diagram of the cross-sectional structure of a test fixture for fixed delay of an ultrasonic flowmeter provided in an embodiment of the utility model.
[0022] Figure 2 for Figure 1 A magnified schematic diagram of part A in FIG.
[0023] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure of multiple intermediate rings combined in the test fixture for fixed delay of ultrasonic flowmeter.
[0024] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of the middle ring of the test fixture for fixed delay of the ultrasonic flowmeter.
[0025] Figure 5 A flow chart of a testing method provided in an embodiment of the utility model.
[0026] The reference numerals and components involved in the drawings are as follows:
[0027] 1. Left bracket 2. Right bracket 3. Middle ring
[0028] 31. Plug 32. Bayonet 33. Socket
[0029] 34, clamp 4, clamp screw 41, wire hole
[0030] 5. Ultrasonic probe 6. Accommodating cavity 61. Probe accommodating cavity
[0031] 62. Screw receiving cavity DETAILED DESCRIPTION
[0032] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0033] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the present utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0034] Example 1
[0035] Figure 1 A schematic cross-sectional structure diagram of a test fixture for fixing the delay of an ultrasonic flowmeter provided in an embodiment of the utility model, Figure 2 for Figure 1 The enlarged schematic diagram of part A in FIG. Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure of the multiple intermediate rings of the ultrasonic flow meter fixed delay test fixture. Please refer to Figure 1 , Figure 2 , Figure 3 The ultrasonic flow meter fixed delay test fixture provided by the embodiment of the utility model comprises a left bracket 1, a right bracket 2, an intermediate ring 3, a clamping screw 4 and an ultrasonic probe 5; the middle parts of the left bracket 1 and the right bracket 2 are both provided with a receiving cavity 6, and the receiving cavity 6 comprises a probe receiving cavity 61 and a screw receiving cavity 62; one end of the probe receiving cavity 61 passes through the inner surface of the left bracket 1 and the right bracket 2, and the other end of the probe receiving cavity 61 is connected to the screw receiving cavity 62, and one end of the screw receiving cavity 62 passes through the left bracket 1 and the right bracket 2, an internal thread cooperating with the clamping screw 4 is provided on the inner wall of the screw accommodating cavity 62; a wire hole 41 is provided on the clamping screw 4; the ultrasonic probe 5 is located in the probe accommodating cavity 61, the head of the ultrasonic probe 5 points to the inside of the left bracket 1 and the right bracket 2, the wire at the tail of the ultrasonic probe 5 passes through the wire hole 41, and the clamping screw 4 is located in the screw accommodating cavity 62 to clamp the ultrasonic probe 5; a plurality of the intermediate rings 3 are stacked and connected in sequence between the left bracket 1 and the right bracket 2.
[0036] It should be noted that, when assuming that the sound speed is C, the distance is L, the theoretical time is T=L / C; the actual measured time is Tr; different distances are taken in the experiment and it is found that the value of Tr-T remains unchanged; it is defined as the inherent delay T0 caused by the circuit; if the length L is used as the length to measure the time T1, and the length 2L is used as the length to measure T2; the inherent delay is calculated to be 2*T2-T1; therefore, the test fixture for the fixed delay of the ultrasonic flowmeter of the utility model can change the length by the number of intermediate rings 3, and then avoid the uncertainty of the test sound speed by the accuracy of the length.
[0037] Figure 4 for Figure 1 The cross-sectional structure diagram of the middle ring of the ultrasonic flowmeter fixed delay test fixture in FIG. Figure 4 The intermediate ring 3 of the utility model is in a circular ring shape, and a plug 31 is provided on the side of one end of the intermediate ring 3, and a bayonet 32 is provided at the bottom of the plug 31; a socket 33 matching with the plug 31 is provided on the inner wall of the other end of the intermediate ring 3, and a clamp 34 is provided at the edge of the socket 33; a socket 33 is provided on the bottom surface of the left bracket 1, and a clamp 34 is provided at the edge of the socket 33; a plug 31 is provided on the bottom surface of the right bracket 2, and a bayonet 32 is provided at the bottom of the plug 31; a plurality of The plug 31 of one of the intermediate rings 3 is inserted into the socket 33 on the bottom surface of the left bracket 1, and the plug 31 of another intermediate ring 3 is inserted into the socket 33 of the intermediate ring 3, until the plug 31 of the last intermediate ring 3 is inserted into the socket 33 of the second to last intermediate ring 3; the plug 31 on the bottom surface of the right bracket 2 is inserted into the socket 33 of the last intermediate ring 3, and the card head 34 in the socket 33 is correspondingly carded in the card slot 32 on the plug 31 inserted into the socket 33.
[0038] Specifically, four intermediate rings 3 are stacked and connected in sequence between the left bracket 1 and the right bracket 2; the ultrasonic probe 5 located on the left bracket 1 and the ultrasonic probe 5 located on the right bracket 2 point to each other; the axis of the probe accommodating cavity 61, the axis of the screw accommodating cavity 62 and the axis of the intermediate ring 3 are located on the same straight line; the distance between adjacent end faces of the intermediate rings 3 is 20 mm.
[0039] Figure 5 This is a flow chart of the test method provided by the embodiment of the utility model. Figure 5 The testing method of the utility model is applied to the above-mentioned ultrasonic flow meter fixed delay testing tooling.
[0040] Specifically, the testing method comprises the following steps:
[0041] S1: The preset sound speed is C, the distance between the end faces of adjacent intermediate rings 3 is L, and the theoretical time is T = L / C;
[0042] S2: The actual measured time is Tr;
[0043] S3: When different distances are selected, the value of Tr-T remains unchanged;
[0044] S4: define the value of Tr-T as the intrinsic delay T0;
[0045] S5: Use length L as the length to measure time T1, use length 2L as the length to measure T2, and calculate the inherent delay as 2*T2-T1.
[0046] Based on the above description, it can be seen that the advantages of the utility model are:
[0047] The test fixture for ultrasonic flowmeter with fixed delay of the present invention, when assuming that the sound speed is C, the distance is L, the theoretical time is T=L / C; the actual measured time is Tr; different distances are taken in the experiment and it is found that the value of Tr-T is fixed; it is defined as the inherent delay T0 caused by the circuit; if the length L is used as the length to measure the time T1, and the length 2L is used as the length to measure T2; the calculated inherent delay is 2*T2-T1; therefore, the test fixture for ultrasonic flowmeter with fixed delay of the present invention can change the length by the number of intermediate rings 3, and then avoid the uncertainty of the test sound speed by the accuracy of the length.
[0048] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A test fixture for fixed delay of ultrasonic flowmeter, characterized in that: It comprises a left bracket (1), a right bracket (2), an intermediate ring (3), a clamping screw (4) and an ultrasonic probe (5); The left bracket (1) and the right bracket (2) are both provided with a receiving cavity (6) in the middle, and the receiving cavity (6) includes a probe receiving cavity (61) and a screw receiving cavity (62); one end of the probe receiving cavity (61) passes through the inner surface of the left bracket (1) and the right bracket (2), and the other end of the probe receiving cavity (61) is connected to the screw receiving cavity (62); one end of the screw receiving cavity (62) passes through the outer surface of the left bracket (1) and the right bracket (2), and an internal thread matching the clamping screw (4) is provided on the inner wall of the screw receiving cavity (62); the clamping screw (4) is provided with a penetrating wire hole (41); The ultrasonic probe (5) is located in the probe accommodating cavity (61), the head of the ultrasonic probe (5) points to the inside of the left bracket (1) and the right bracket (2), the wire at the tail of the ultrasonic probe (5) passes through the wire hole (41), and the clamping screw (4) is located in the screw accommodating cavity (62) to clamp the ultrasonic probe (5); A plurality of intermediate rings (3) are stacked and connected in sequence between the left bracket (1) and the right bracket (2).
2. The ultrasonic flowmeter fixed delay test fixture according to claim 1, characterized in that: The intermediate ring (3) is in the shape of a circular ring. A plug (31) is provided on the side surface of one end of the intermediate ring (3), and a bayonet (32) is provided at the bottom of the plug (31). A socket (33) matching with the plug (31) is provided on the inner wall of the other end of the intermediate ring (3), and a clamping head (34) is provided at the edge of the socket (33). A socket (33) is provided on the bottom surface of the left bracket (1), and a clamp (34) is provided at the edge of the socket (33); a plug (31) is provided on the bottom surface of the right bracket (2), and a clamp (32) is provided at the bottom of the plug (31); The plug (31) of one of the plurality of intermediate rings (3) is inserted into the socket (33) on the bottom surface of the left bracket (1), and the plug (31) of another intermediate ring (3) is inserted into the socket (33) of the intermediate ring (3), until the plug (31) of the last intermediate ring (3) is inserted into the socket (33) of the second-to-last intermediate ring (3); The plug (31) on the bottom surface of the right bracket (2) is inserted into the socket (33) of the last intermediate ring (3), and the clamping head (34) in the socket (33) is correspondingly clamped in the clamping socket (32) on the plug (31) inserted into the socket (33).
3. The ultrasonic flowmeter fixed delay test fixture according to claim 1, characterized in that: Four intermediate rings (3) are stacked and connected in sequence between the left bracket (1) and the right bracket (2).
4. The ultrasonic flowmeter fixed delay test fixture according to claim 1, characterized in that: The ultrasonic probe (5) located on the left bracket (1) and the ultrasonic probe (5) located on the right bracket (2) point toward each other.
5. The ultrasonic flowmeter fixed delay test fixture according to claim 1, characterized in that: The axis of the probe accommodating cavity (61), the axis of the screw accommodating cavity (62) and the axis of the intermediate ring (3) are located on the same straight line.
6. The ultrasonic flowmeter fixed delay test fixture according to claim 1, characterized in that: The distance between the end faces of adjacent intermediate rings (3) is 20 mm.