An experimental apparatus for ultrasound transducer detection and pairing

Abstract

The utility model provides a kind of experimental device for ultrasonic transducer detection and pairing, including straight pipe, two probe holders, two compression rings, thermometer, pressure gauge, three-way pipe and two valves, and straight pipe is multiple, and straight pipe is sealingly connected to constitute measuring pipeline between straight pipe, and the number of straight pipe changes according to the different simulation distance, and the both ends of measuring pipeline are sealingly connected with two probe holders respectively, and the middle part of two probe holders is provided with stepped hole, and two transducers needing to be tested are sealingly connected to two probe holders by compression ring respectively.Thermometer is sealingly connected to measuring pipeline by adapter, for monitoring the medium temperature between two transducers;The first end of three-way pipe is sealingly connected to measuring pipeline by adapter, the second end is connected with pressure gauge by first valve, and pressure gauge is used to monitor the medium pressure between two transducers, and the third end is connected to second valve;The other end of second valve is used as gas injection port.

Description

TECHNICAL FIELD

[0001] The utility model relates to an experimental device for ultrasonic transducer detection and pairing, which is used for screening and pairing of ultrasonic transducers in the development process of gas ultrasonic flowmeter, so as to ensure the measurement accuracy and stability of ultrasonic flowmeter. BACKGROUND

[0002] In order to realize the design and production of high-precision gas ultrasonic flowmeter, it is necessary to first test the ultrasonic transducer, which is the key component of ultrasonic flowmeter, so as to screen out ultrasonic transducers with consistent electrical and acoustic characteristic parameters for pairing, and ensure the measurement accuracy of ultrasonic flowmeter. Most enterprises only test the static capacitance of a single transducer or measure the impedance characteristic curve of a single transducer with an impedance analyzer after purchasing a batch of transducers, and then complete the pairing. However, when the temperature, pressure and measured gas medium change in different application environments of gas ultrasonic flowmeter, the two paired transducers may have inconsistent characteristic parameters, which may seriously affect the zero flow reading of ultrasonic flowmeter when the difference is large, and further affect the measurement accuracy of the lower limit of flowmeter. SUMMARY

[0003] The utility model discloses an experimental device for ultrasonic transducer detection and pairing, which is used for screening and pairing of ultrasonic transducers in the development process of gas ultrasonic flowmeter, so as to ensure the measurement accuracy and stability of ultrasonic flowmeter.

[0004] An experimental device for ultrasonic transducer detection and pairing, comprising a straight pipe, two probe seats, two compression rings, a temperature gauge, a pressure gauge, a tee pipe and two valves, characterized in that the straight pipe is multiple, the straight pipes are sealingly connected to form a measuring pipeline, the number of straight pipes is changed according to different simulated distances, two probe seats are sealingly connected to the two ends of the measuring pipeline, the middle part of each probe seat is provided with a stepped hole for accommodating the transducer to be tested, and the two transducers to be tested are sealingly connected to the two probe seats through the compression rings. The temperature gauge is sealingly connected to the measuring pipeline through an adapter for monitoring the temperature of the medium between the two transducers; the first end of the tee pipe is sealingly connected to the measuring pipeline through an adapter, the second end is connected to the pressure gauge through a first valve, the pressure gauge is used for monitoring the pressure of the medium between the two transducers, and the third end is connected to a second valve; the other end of the second valve is used as a gas inlet.

[0005] Further, the middle part of the two probe bases is provided with stepped holes with internal threads, the external threads of the compression ring are matched with the internal threads of the probe bases, and the two transducers to be tested are respectively pressed into the two probe bases through the compression ring and the gasket.

[0006] Further, the straight pipes are connected through threads and sealing rings.

[0007] Further, the two ends of the measuring pipe are respectively connected with the two probe bases through threads and sealing rings.

[0008] Further, the valve is a hand valve.

[0009] The experimental device for ultrasonic transducer detection and pairing has the characteristics that the distance of the transducers is convenient to adjust, the type of the detection medium and the temperature and pressure of the medium are convenient to change, and the medium pressure and temperature are convenient to monitor. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a cross-sectional schematic view of the experimental device for ultrasonic transducer detection and pairing of the utility model;

[0011] Figure 2 is an appearance structure schematic view of the experimental device for ultrasonic transducer detection and pairing of the utility model;

[0012] Figure 3 is an impedance characteristic curve of the transducer numbered 1.

[0013] Figure 4 is an impedance characteristic curve of the transducer numbered 2.

[0014] Figure 5 is an impedance characteristic curve of the transducer numbered 4.

[0015] Figure 6 is an impedance characteristic curve of the transducer numbered 7.

[0016] BRIEF DESCRIPTION OF DRAWINGS

[0017] Probe base one 1, sealing ring 2, straight pipe 3, probe base two 4, first adapter 51, second adapter 52, small sealing ring 6, compression ring 7, gasket 8, transducer 9, thermometer 10, tee pipe 11, first hand valve 121, second hand valve 122, pressure gauge 13 DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings to make the utility model embodiment further detailed description.

[0019] The utility model discloses a kind of experimental devices for ultrasonic transducer detection and pairing, which can be used to test the characteristic parameters of ultrasonic transducers to be paired under different sound path distances, media, pressures and temperatures, especially zero-flow readings, to meet the requirements of zero-flow readings in the "JJG 1030-2007 Ultrasonic Flowmeter Verification Regulation".

[0020] Figure 1 The utility model discloses a kind of experimental devices for ultrasonic transducer detection and pairing, which can be used to test the characteristic parameters of ultrasonic transducers to be paired under different sound path distances, media, pressures and temperatures, especially zero-flow readings, to meet the requirements of zero-flow readings in the "JJG 1030-2007 Ultrasonic Flowmeter Verification Regulation".

[0021] The straight pipes are connected by threads and sealing rings to form a measuring pipeline, and the number of straight pipes can be changed according to different simulated distances. Two probe holders are connected by threads and sealing rings at both ends of the measuring pipeline. The middle parts of the two probe holders are provided with stepped holes with internal threads, which are used to accommodate the transducers 9 to be tested. The external threads of the compression rings 7 cooperate with the internal threads of the probe holders. The two transducers to be tested are pressed into the two probe holders by the compression rings 7 and gaskets 8, which fix the two transducers 9 and ensure the distance between them unchanged during the test. When different distances need to be simulated, the number of straight pipes 3 can be adjusted.

[0022] The temperature gauge 10 is used to monitor the temperature of the medium between the two transducers 9. The first adapter 51 is tightened with a small sealing ring 6 on the straight pipe 3, and then the temperature gauge 10 is installed on the adapter 5 and tightened. This can realize the monitoring of the medium temperature during the testing of the transducers 9.

[0023] The pressure gauge 13 is used to monitor the pressure of the medium between the two transducers 9. The second adapter 52 is tightened with a small sealing ring 6 on the straight pipe 3, and then the tee 11 is connected to the adapter 52 at the first end and to one end of the first hand valve 121 at the second end. The other end of the first hand valve 121 is installed with the pressure gauge 13, which can realize the monitoring of the medium pressure during the testing of the transducers 9. The third end of the tee 11 is connected to the second hand valve 122, and the other end of the second hand valve 122 can be connected to the gas injection port, which can be used to inject gas into the measuring pipeline to increase the gas pressure.

[0024] Experimental test results:

[0025] Two ultrasonic transducers to be tested are fixed on probe seat one and probe seat two respectively, and the distance between the two transducers is adjusted to 7.5cm. The device is placed in a temperature chamber. Firstly, the impedance characteristic curves of a single transducer at different temperatures are tested, and two transducers with relatively consistent change rules are selected. Secondly, the zero flow readings of the two transducers are tested in the heating and cooling processes, the medium is air, and the measurement results at different temperatures are analyzed. Finally, the pairing conclusion is given.

[0026] Figures 3-6 Impedance characteristic curves of four transducers (No. 1, 2, 4, 7) randomly selected from a batch of transducers.

[0027] As can be seen from the figure, the characteristic curves of transducers 1# and 2# and transducers 4# and 7# change regularly with temperature, so the zero flow readings are tested after pairing.

[0028] Table 1 Zero flow readings when transducers 1# and 2# are paired

[0029]

[0030] Table 2 Zero flow readings when transducers 4# and 7# are paired

[0031]

[0032] It can be seen that the two pairs of transducers selected by testing have zero flow readings (the average flow rate in the table) not more than 0.004m / s, and the standard deviation not more than 0.005m / s, which meets the requirement of JJG 1030-2007 Ultrasonic Flowmeter Calibration Regulation that the zero flow reading is not more than 12mm / s. Therefore, it is proved that the two pairs of transducers can be well paired and can be directly used for gas ultrasonic flowmeter measurement.

[0033] The utility model discloses a design can conveniently adjust the distance of transducer, fills in natural gas and so on working condition gas medium, carries out the pressure and temperature regulation of medium, thereby carries out all -round test to transducer, thereby help to optimize transducer pairing, improve the working condition adaptability of ultrasonic flowmeter, also improve the detection efficiency of transducer screening pairing.

Claims

1. An experimental apparatus for testing and pairing ultrasonic transducers, comprising a straight tube, two probe holders, two clamping rings, a thermometer, a pressure gauge, a tee pipe, and two valves, characterized in that, Multiple straight pipes are connected in a sealed manner to form a measuring pipeline. The number of straight pipes varies depending on the simulated distance. Two probe holders are sealed at both ends of the measuring pipeline. A stepped hole is provided in the middle of the two probe holders to accommodate the transducer to be tested. The two transducers to be tested are sealed to the two probe holders respectively by a clamping ring. A thermometer is sealed to the measuring pipeline through an adapter to monitor the temperature of the medium between the two transducers. The first end of a tee is sealed to the measuring pipeline through an adapter, the second end is connected to a pressure gauge through a first valve to monitor the pressure of the medium between the two transducers, and the third end is connected to a second valve. The other end of the second valve is used as a gas injection port.

2. The experimental apparatus according to claim 1, characterized in that, The two probe holders have stepped holes with internal threads in the middle. The external thread of the clamping ring and the internal thread of the probe holder are matched. The two transducers to be tested are pressed into the two probe holders respectively through the clamping ring and the gasket.

3. The experimental apparatus according to claim 1, characterized in that, Straight pipes are connected to each other by threads and sealing rings.

4. The experimental apparatus according to claim 1, characterized in that, The measuring pipe has two probe seats at both ends, which are sealed by threads and sealing rings.

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