Test tool and test method for fixed time delay of ultrasonic flowmeter
By designing a fixed-delay test fixture for ultrasonic flow meters and using the change in length of the intermediate ring to define the inherent delay, the problem of detection accuracy for large-diameter and non-circular pipe flow meters was solved, achieving efficient and economical calibration results.
Patent Information
- Application Number
- CN202411044316.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2026-02-03
AI Technical Summary
Existing technologies are insufficient to effectively test the measurement accuracy of ultrasonic flow meters for large-diameter pipes and non-circular pipes. Actual flow calibration methods are limited and costly, while non-actual flow calibration methods cannot accurately calibrate the ultrasonic propagation average time and timing system delay.
Design a test fixture for fixed delay of ultrasonic flow meter, including left support, right support, intermediate ring and ultrasonic probe. The length is changed by precisely controlling the number of intermediate rings. The inherent delay is defined by the difference between theoretical time and actual measured time, avoiding the uncertainty of sound velocity and achieving accurate calibration.
By precisely controlling the length, the uncertainty of sound velocity is avoided, which improves the detection accuracy and economy of ultrasonic flow meters and is suitable for the calibration of large-diameter and non-circular tube flow meters.
Smart Images
Figure CN121453162A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of ultrasonic flowmeter, more particularly, to a test tool and method for fixed time delay of ultrasonic flowmeter. BACKGROUND
[0002] Ultrasonic flowmeter is widely used in flow measurement field, especially in large diameter pipe water flow (such as hydropower station), square culvert flow and open channel flow measurement, and has become the main measurement method. The accuracy of flowmeter is often the most concerned technical index of the user. The detection method of ultrasonic flowmeter measurement performance usually contains two categories: real flow calibration and non-real flow calibration.
[0003] Real flow calibration is a commonly used detection method at present, which uses a flow standard device to generate and obtain a standard flow signal, and detects by comparing with the measured value of the flowmeter. This method has high accuracy, but it is limited by the measurement range and installation conditions of the flow standard device, and generally cannot detect flowmeters with pipe diameter exceeding 3m, flowmeters requiring field installation of transducers and non-circular pipe flowmeters. In addition, real flow calibration needs to be carried out in the laboratory, and the cost is relatively high. For flowmeter production enterprises, large-scale factory detection has great economic pressure.
[0004] Non-real flow calibration is a detection technology of ultrasonic flowmeter developed in recent years, which contains the detection of multiple physical quantities affecting the measurement accuracy of flowmeter. It detects and calibrates the flowmeter by calibrating each component in the calculation formula of ultrasonic flowmeter and the accuracy of the calculation formula. The main source of measurement error of ultrasonic propagation average time is the calibration components including probe acoustic wedge internal delay and timing system delay.
[0005] The foregoing description is to provide general background information and does not necessarily constitute prior art. SUMMARY
[0006] The purpose of the present application is to provide a test tool and method for fixed time delay of ultrasonic flowmeter, which avoids the uncertainty of test sound velocity by the accuracy of length.
[0007] The application provides a kind of fixed delay test tool of ultrasonic flowmeter, including left support, right support, intermediate ring, compression screw and ultrasonic probe;The middle part of the left support and the right support is equipped with containing cavity, the containing cavity includes probe containing cavity and screw containing cavity;One end of the probe containing cavity penetrates the inner face of the left support and the right support, the other end of the probe containing cavity is connected with the screw containing cavity, one end of the screw containing cavity penetrates the outer face of the left support and the right support, and the inner thread matched with the compression screw is arranged on the inner wall of the screw containing cavity;The compression screw is provided with a wire hole penetrating through;The ultrasonic probe is located in the probe containing cavity, the head of the ultrasonic probe points to the inside of the left support and the right support, the wire of the tail of the ultrasonic probe passes out of the wire hole, and the compression screw is located in the screw containing cavity to compress the ultrasonic probe;A plurality of intermediate rings are connected in sequence between the left support and the right support.
[0008] Further, the intermediate ring is in the shape of a circular ring, a plug is arranged on one end side of the intermediate ring, and a bayonet is arranged on the bottom of the plug;A socket is arranged on the inner wall of the other end of the intermediate ring, and a latch is arranged on the edge of the socket;A socket is arranged on the bottom surface of the left support, and a latch is arranged on the edge of the socket;A plug is arranged on the bottom surface of the right support, and a bayonet is arranged on the bottom of the plug;The plug of one of the plurality of intermediate rings is inserted into the socket on the bottom surface of the left support, the plug of another intermediate ring is inserted into the socket of the intermediate ring, and so on until the plug of the last intermediate ring is inserted into the socket of the second last intermediate ring;The plug on the bottom surface of the right support is inserted into the socket of the last intermediate ring, and the latch in the socket is latched in the bayonet on the plug inserted into the socket.
[0009] Further, four intermediate rings are connected in sequence between the left support and the right support.
[0010] Further, the ultrasonic probe located on the left support and the ultrasonic probe located on the right support point to each other.
[0011] Further, the axis of the probe containing cavity, the axis of the screw containing cavity and the axis of the intermediate ring are on the same straight line.
[0012] Further, the distance between the end faces of adjacent intermediate rings is 20mm.
[0013] The application also provides a test method, which is applied to the above-mentioned fixed delay test tool of ultrasonic flowmeter.
[0014] Further, the test method comprises the following steps:
[0015] S1: presetting the sound speed as C, the distance between the adjacent end faces of the intermediate ring as L, obtaining the theoretical time as T=L / C;
[0016] S2: actually measuring the time as Tr;
[0017] S3: when different distances are selected, the value of Tr-T remains unchanged;
[0018] S4: defining the value of Tr-T as the inherent delay T0;
[0019] S5: using the length L as the length to measure the time T1, using the length 2L as the length to measure T2, and calculating the inherent delay as 2*T2-T1.
[0020] The test tool for the fixed delay of the ultrasonic flowmeter of the application, when assuming that the sound speed is C and the distance is L, the theoretical time is T=L / C; the actually measured time is Tr; when different distances are selected in the experiment, it is found that the value of Tr-T remains unchanged; then 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, the length 2L is used as the length to measure T2; the inherent delay is calculated as 2*T2-T1; therefore, the length can be changed by the number of the intermediate rings, and the uncertainty of the test sound speed can be avoided by the accuracy of the length. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 The sectional structure schematic view of the test tool for the fixed delay of the ultrasonic flowmeter provided by the embodiment of the application.
[0022] Figure 2 The enlarged schematic view of part A in Figure 1
[0023] Figure 3 The sectional structure schematic view of the test tool for the fixed delay of the ultrasonic flowmeter in Figure 1
[0024] Figure 4 The sectional structure schematic view of the intermediate ring of the test tool for the fixed delay of the ultrasonic flowmeter in Figure 1
[0025] Figure 5 The flowchart schematic view of the test method provided by the embodiment of the application.
[0026] The reference signs and components involved in the drawings are shown as follows:
[0027] 1, left support 2, right support 3, intermediate ring
[0028] 31, plug 32, bayonet 33, socket
[0029] 34, clamp 4, compression screw 41, wire hole
[0030] 5, ultrasonic probe 6, accommodating cavity 61, probe accommodating cavity
[0031] 62, screw accommodating cavity DETAILED DESCRIPTION
[0032] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.
[0033] The terms "first", "second", "third", "fourth" and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence.
[0034] Example 1
[0035] Figure 1 The cross-sectional structure schematic diagram of the ultrasonic flowmeter fixed delay test tool provided by the embodiment of the present application, Figure 2 is Figure 1 The enlarged schematic diagram of A part in Figure 3 is Figure 1 The cross-sectional structure schematic diagram of the ultrasonic flowmeter fixed delay test tool in Figure 1 , Figure 2 , Figure 3 The ultrasonic flowmeter fixed delay test tool provided by the embodiment of the present application, comprising a left support 1, a right support 2, a middle ring 3, a compression screw 4 and an ultrasonic probe 5; the middle part of the left support 1 and the right support 2 is provided with an accommodating cavity 6, the accommodating cavity 6 includes a probe accommodating cavity 61 and a screw accommodating cavity 62; one end of the probe accommodating cavity 61 penetrates the inner surface of the left support 1 and the right support 2, the other end of the probe accommodating cavity 61 is connected with the screw accommodating cavity 62, one end of the screw accommodating cavity 62 penetrates the outer surface of the left support 1 and the right support 2, and an internal thread matched with the compression screw 4 is arranged on the inner wall of the screw accommodating cavity 62; the compression screw 4 is provided with a wire hole 41 penetrating through; 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 support 1 and the right support 2, the wire of the tail of the ultrasonic probe 5 passes out from the wire hole 41, and the compression screw 4 is located in the screw accommodating cavity 62 to compress the ultrasonic probe 5; a plurality of middle rings 3 are connected in turn by being nested between the left support 1 and the right support 2.
[0036] It should be noted that when 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 the value of Tr-T is fixed; the inherent delay T0 is defined 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 as 2*T2-T1; therefore, the fixed delay test tool of the ultrasonic flowmeter of the application can change the length by the number of intermediate rings 3, and thus avoid the uncertainty of testing the sound speed by the accuracy of the length.
[0037] Figure 4 For Figure 1 The cross-sectional structure diagram of the intermediate ring of the fixed delay test tool of the ultrasonic flowmeter is shown in Figure 4 The intermediate ring 3 of the application is in the shape of a circular ring, one end of the intermediate ring 3 is provided with a plug 31, and the bottom of the plug 31 is provided with a bayonet 32; the inner wall of the other end of the intermediate ring 3 is provided with a socket 33 matched with the plug 31, and the edge of the socket 33 is provided with a clamping head 34; the bottom surface of the left support 1 is provided with a socket 33, and the edge of the socket 33 is provided with a clamping head 34; the bottom surface of the right support 2 is provided with a plug 31, and the bottom of the plug 31 is provided with a bayonet 32; 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 support 1, the plug 31 of another intermediate ring 3 is inserted into the socket 33 of the intermediate ring 3, and the plug 31 of the last intermediate ring 3 is inserted into the socket 33 of the second last intermediate ring 3; the plug 31 on the bottom surface of the right support 2 is inserted into the socket 33 of the last intermediate ring 3, and the clamping head 34 in the socket 33 is clamped in the bayonet 32 on the plug 31 inserted into the socket 33.
[0038] Specifically, four intermediate rings 3 are connected in sequence between the left support 1 and the right support 2; the ultrasonic probes 5 located on the left support 1 and the ultrasonic probes 5 located on the right support 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 the end faces of adjacent intermediate rings 3 is 20mm.
[0039] Figure 5 The flowchart of the test method provided by the embodiment of the application is shown in Figure 5 The test method of the application is applied to the fixed delay test tool of the ultrasonic flowmeter described above.
[0040] Specifically, the test method comprises the following steps:
[0041] S1: presetting the sound velocity as C, the distance between the end faces of the adjacent intermediate rings 3 as L, obtaining the theoretical time as T=L / C;
[0042] S2: actually measuring the time as Tr;
[0043] S3: when selecting different distances, the value of Tr-T remains unchanged;
[0044] S4: defining the value of Tr-T as the inherent delay T0;
[0045] S5: using the length L as the length to measure the time T1, using the length 2L as the length to measure T2, and calculating the inherent delay as 2*T2-T1.
[0046] It should be noted that the steps S1-S4 are used to explain the origin of T0; and the accurate time is obtained through the step S5.
[0047] Based on the above description, the advantages of the present application are as follows:
[0048] The test tool for the fixed delay of the ultrasonic flowmeter of the present application, when assuming the sound velocity as C and the distance as L, the theoretical time as T=L / C; the actually measured time as Tr; when selecting different distances in the experiment, it is found that the value of Tr-T is fixed and unchanged; then the inherent delay T0 is defined as 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 as 2*T2-T1; therefore, the test tool for the fixed delay of the ultrasonic flowmeter of the present application can change the length through the number of the intermediate rings 3, and then avoid the uncertainty of the test sound velocity through the accuracy of the length.
[0049] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A test fixture for a fixed delay of an ultrasonic flow meter, characterized in that, It includes a left support (1), a right support (2), an intermediate ring (3), a clamping screw (4), and an ultrasonic probe (5); The left support (1) and the right support (2) are each provided with a receiving cavity (6) in the middle. 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 support (1) and the right support (2). 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 outside of the left support (1) and the right support (2). The inner wall of the screw receiving cavity (62) is provided with an internal thread that mates with the clamping screw (4). The clamping screw (4) is provided with a through wire hole (41). The ultrasonic probe (5) is located in the probe receiving 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 receiving cavity (62) to clamp the ultrasonic probe (5). Multiple intermediate rings (3) are stacked and connected sequentially between the left support (1) and the right support (2).
2. The test fixture for fixed delay of ultrasonic flowmeter according to claim 1, characterized in that, The intermediate ring (3) is circular. A plug (31) is provided on one side of the intermediate ring (3), and a buckle (32) is provided at the bottom of the plug (31). A socket (33) that mates with the plug (31) is provided on the inner wall of the other end of the intermediate ring (3), and a buckle (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 locking head (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 locking head (32) is provided at the bottom of the plug (31); 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 that 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 corresponding clip (34) in the socket (33) is clipped into the clip (32) on the plug (31) inserted into the socket (33).
3. The test fixture for fixed delay of ultrasonic flowmeter according to claim 1, characterized in that, Four intermediate rings (3) are stacked and connected sequentially between the left support (1) and the right support (2).
4. The test fixture for fixed delay of ultrasonic flowmeter according to claim 1, characterized in that, The ultrasound probe (5) located on the left support (1) and the ultrasound probe (5) located on the right support (2) point towards each other.
5. The test fixture for fixed delay of ultrasonic flowmeter according to claim 1, characterized in that, The axis of the probe receiving cavity (61), the axis of the screw receiving cavity (62), and the axis of the intermediate ring (3) are on the same straight line.
6. The test fixture for fixed delay of ultrasonic flowmeter according to claim 1, characterized in that, The distance between the end faces of adjacent intermediate rings (3) is 20 mm.
7. A testing method, characterized in that, The test method is applied to the fixed-delay test fixture for ultrasonic flowmeters as described in any one of claims 1 to 6.
8. The test method according to claim 7, characterized in that, The testing method includes the following steps: S1: The preset sound velocity is C, and the distance between the end faces of the adjacent intermediate rings (3) is L. The theoretical time is T = L / C. S2: The actual measured time is Tr; S3: The value of Tr-T remains unchanged when different distances are selected; S4: Define the value of Tr-T as the inherent delay T0; 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.