CN109031078B - Method for evaluating insulation performance of transducer sealing material - Google Patents
Method for evaluating insulation performance of transducer sealing material Download PDFInfo
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- CN109031078B CN109031078B CN201811249852.9A CN201811249852A CN109031078B CN 109031078 B CN109031078 B CN 109031078B CN 201811249852 A CN201811249852 A CN 201811249852A CN 109031078 B CN109031078 B CN 109031078B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
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Abstract
The invention discloses an insulation performance evaluation method of a transducer sealing material, and belongs to the technical field of transducers. A standard transducer model with a structure similar to that of the transducer is designed, a working surface of the standard transducer model is coated with a transducer sealing material, and the insulation performance of the transducer sealing material is evaluated by measuring the insulation resistance between the anode and the cathode of the standard transducer model and the insulation resistance of the anode and the cathode to water. The evaluation method for the insulation performance of the transducer sealing material is converted from indirect measurement of the surface resistance and the volume resistivity of the transducer sealing material into direct measurement of the insulation resistance between the anode and the cathode of the standard transducer model and the water of the anode and the cathode, and is more in line with the practical application scene of the transducer sealing material.
Description
Technical Field
The invention relates to the technical field of transducers, in particular to a method for evaluating the insulation performance of a transducer sealing material.
Background
Transducer sealing materials are mainly used for acoustically transparent sealing of the wet end part of a sonar system, i.e. the transducer, and are the only barrier isolating the electronics in the transducer from the sea water. The insulating properties of the transducer encapsulant have a large impact on transducer reliability and lifetime. Taking a transmitting transducer as an example, when the insulation resistance of the sealing material of the transducer is less than a certain value, current overload can be caused, the transmitter can not effectively apply voltage to the transducer, the sound source level is reduced, and even the transmitter is burnt. Therefore, the testing and evaluation of the insulation properties of the transducer sealing material are of great significance for the reliable use of the transducer.
At present, the insulation performance of a transducer sealing material is generally evaluated by making a standard material sample, measuring performance parameters such as surface resistance and volume resistivity of the standard material sample, and comparing and evaluating the insulation performance of the transducer sealing material according to the data such as the surface resistance and the volume resistivity. However, the method cannot reflect the direct effect of the material performance on the insulating performance of the transducer, and does not meet the practical application condition of the transducer sealing material. The practical application scene of the transducer sealing material is to wrap the transducer as a protective layer, and work in an underwater environment for a long time. Water molecules can permeate into the internal structure of the transducer through the transducer sealing material, so that the insulation resistance of the transducer is continuously reduced; in addition, the adhesion strength between the transducer sealing material and the metal shell of the transducer also influences the permeation of water molecules in the transducer, and finally the insulation resistance is reduced. The quality of the sealing material insulation performance of the transducer is finally embodied as the insulation resistance between the positive pole and the negative pole of the transducer, between the positive pole and water and between the negative pole and the water. The insulation resistance between the anode and the cathode of the transducer and the insulation resistance of the anode and the cathode to water are not only related to the surface resistance, the volume resistivity and other properties of the transducer sealing material, but also influenced by various factors such as the water molecule barrier property of the transducer sealing material and the working depth of the transducer. The method for evaluating the insulation performance of the transducer sealing material by only measuring data such as surface resistance, volume resistivity and the like of the transducer sealing material has the disadvantages that many factors (such as water molecule barrier performance of the material and bonding strength between the material and a transducer metal shell) influencing the insulation performance of the transducer sealing material cannot be comprehensively reflected, and the insulation resistance between the positive electrode and the negative electrode of the transducer and the insulation resistance of the positive electrode and the negative electrode to water caused by the quality of the insulation performance of the transducer sealing material cannot be directly reflected.
Disclosure of Invention
The invention aims to provide a method for evaluating the insulation performance of a sealing material of a transducer, which aims to solve the problems that the conventional evaluation method cannot comprehensively reflect a plurality of factors influencing the insulation performance and cannot directly reflect the insulation resistance between the positive electrode and the negative electrode of the transducer and the water between the positive electrode and the negative electrode caused by the good and bad insulation performance of the sealing material of the transducer.
In order to solve the technical problem, the invention provides a method for evaluating the insulation performance of a transducer sealing material, which comprises the following steps:
3, leading out the positive and negative electrodes of the piezoelectric ceramics through leads, connecting the leads with two electrodes on one side of the insulator through a plastic cushion block with a hole punched in the middle, and connecting two other leads as the positive and negative electrodes with the two electrodes on the other side of the insulator;
step 4, bonding the insulator with a hole in a shell structure of the transducer, and dividing a cavity into an upper part and a lower part; the cavity above becomes a closed cavity, the cavity below is sealed by a rear cover plate, and the insulation resistance can be opened and measured at any time to form a standard transducer model;
and 5, placing the standard transducer model in water, measuring the insulation resistance between the anode and the cathode and the insulation resistance of the anode and the cathode to the water, and evaluating the insulation performance of the sealing material by comparing the insulation resistance of the standard transducer model packaged with different sealing materials.
Optionally, the transducer housing structure is made of stainless steel.
Optionally, the piezoelectric ceramic is circular, and the diameter of the plastic cushion block is the same as that of the piezoelectric ceramic.
Optionally, the distance between welding spots of the positive electrode and the negative electrode of the piezoelectric ceramic is controlled to be 1-10 mm.
Optionally, the insulator matches the size of the hole in the transducer housing structure.
The invention provides an insulation performance evaluation method of a transducer sealing material, which is characterized in that a standard transducer model with a structure similar to that of a transducer is designed, the working surface of the standard transducer model is coated with the transducer sealing material, and the insulation performance of the transducer sealing material is evaluated by measuring the insulation resistance between the anode and the cathode of the standard transducer model and the insulation resistance of the anode and the cathode to water. The evaluation method for the insulation performance of the transducer sealing material is converted from indirect measurement of the surface resistance and the volume resistivity of the transducer sealing material into direct measurement of the insulation resistance between the anode and the cathode of the standard transducer model and the water of the anode and the cathode, and is more in line with the practical application scene of the transducer sealing material.
Drawings
FIG. 1 is a schematic flow chart of a method for evaluating the insulation performance of a transducer sealing material provided by the present invention;
FIG. 2 is a schematic diagram of a transducer housing structure;
fig. 3 is a schematic view of the construction of the insulator bonded in the transducer housing structure.
Detailed Description
The method for evaluating the insulation performance of the transducer sealing material provided by the invention is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
The invention provides an insulation performance evaluation method of a transducer sealing material, which comprises the steps of designing a standard transducer model with a structure similar to that of a transducer, coating the transducer sealing material on a working surface of the standard transducer model, and evaluating the insulation performance of the transducer sealing material by measuring insulation resistance between a positive electrode and a negative electrode of the standard transducer model and between the positive electrode and the negative electrode and water, wherein the flow is shown in figure 1. The method for evaluating the insulation performance of the transducer sealing material comprises the following steps:
step S11, designing a transducer shell structure with a cavity;
step S12, bonding the piezoelectric ceramics with a plastic cushion block, and bonding the plastic cushion block with the transducer shell;
step S13, leading out the positive and negative electrodes of the piezoelectric ceramics through wires, wherein the wires pass through the plastic cushion block with the holes punched in the middle to be connected with the two electrodes on one side of the insulator, and the two electrodes on the other side of the insulator are additionally connected with two wires as the positive and negative electrodes;
step S14, bonding the insulator with a hole in a shell structure of the transducer, and dividing a cavity into an upper part and a lower part; the cavity above becomes a closed cavity, the cavity below is sealed by a rear cover plate, and the insulation resistance can be opened and measured at any time to form a standard transducer model;
and S15, placing the standard transducer model in water, measuring the insulation resistance between the anode and the cathode and the insulation resistance of the anode and the cathode to the water, and evaluating the insulation performance of the sealing material by comparing the insulation resistance of the standard transducer model packaged with different sealing materials.
Specifically, firstly, a transducer housing structure 1 with a cavity in the middle is designed as shown in fig. 2, and the material of the transducer housing structure 1 is stainless steel; then, bonding the round piezoelectric ceramics with a plastic cushion block, and bonding the plastic cushion block with the transducer shell 1, wherein the diameter of the plastic cushion block is the same as that of the round piezoelectric ceramics; then leading out the positive and negative electrodes of the piezoelectric ceramic through wires, wherein the wires penetrate through a plastic cushion block with a hole punched in the middle to be connected with two electrodes on one side of the insulator 2, the other two electrodes on the other side of the insulator 2 are connected with two wires as the positive and negative electrodes, and further, the distance between welding points of the positive and negative electrodes of the piezoelectric ceramic is controlled to be 1-10 mm; bonding the insulator 2 with a hole in the transducer housing structure 1, and dividing a cavity into an upper part and a lower part, referring to fig. 3, wherein the insulator 2 is matched with the hole in the transducer housing structure 1 in size; sealing by a sealing material, wherein the upper cavity becomes a sealed cavity, and the lower cavity is sealed by a rear cover plate, so that the insulation resistance can be opened and measured at any time to form a standard transducer model; and finally, placing the standard transducer model in water, simulating an actual use environment, and measuring the insulation resistance between the anode and the cathode and the insulation resistance of the anode and the cathode to the water, wherein the measurement can be carried out every day or at intervals of a plurality of days. The insulating properties of the encapsulant were evaluated by comparing the magnitude of the insulation resistance of standard transducer models encapsulating different encapsulants.
Example two
In the second embodiment, polyurethane and butadiene rubber are selected as the sealing material, and referring to the procedure of the first embodiment, wherein the diameter of the plastic pad and the diameter of the piezoelectric ceramic are both 20mm, the distance between the welding points of the positive electrode and the negative electrode is set to be 10mm, and the measurement is performed at intervals of 3 days, under the same measurement conditions, the data shown in table 1 and table 2 are finally obtained by performing measurement evaluation on five groups of parallel samples of polyurethane and five groups of parallel samples of butadiene rubber respectively:
TABLE 1 insulation Properties of the polyurethanes
TABLE 2 insulation Properties of the polybutadienes
In tables 1 and 2, infinity indicates that 1000 M.OMEGA.has been exceeded.
By designing a standard transducer model, the invention not only eliminates factors influencing the insulation performance of the transducer except for a transducer sealing material, but also reflects the effects of other performances of materials which are not considered in the current indirect evaluation method, such as water molecule barrier performance and the bonding strength between the materials and a transducer metal shell in the results. The evaluation method for the insulation performance of the transducer sealing material is converted from indirect measurement of the surface resistance and the volume resistivity of the transducer sealing material into direct measurement of the insulation resistance between the anode and the cathode of the standard transducer model and the water of the anode and the cathode, and is more in line with the practical application scene of the transducer sealing material.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (5)
1. A method for evaluating the insulating property of a transducer sealing material is characterized by comprising the following steps:
step 1, designing a transducer shell structure with a cavity;
step 2, bonding the piezoelectric ceramic with a plastic cushion block, and bonding the plastic cushion block with the transducer shell;
3, leading out the positive and negative electrodes of the piezoelectric ceramics through leads, connecting the leads with two electrodes on one side of the insulator through a plastic cushion block with a hole punched in the middle, and connecting two other leads as the positive and negative electrodes with the two electrodes on the other side of the insulator;
step 4, bonding the insulator with a hole in a shell structure of the transducer, and dividing a cavity into an upper part and a lower part; the cavity above becomes a closed cavity, the cavity below is sealed by a rear cover plate, and the insulation resistance can be opened and measured at any time to form a standard transducer model;
and 5, placing the standard transducer model in water, measuring the insulation resistance between the anode and the cathode and the insulation resistance of the anode and the cathode to the water, and evaluating the insulation performance of the sealing material by comparing the insulation resistance of the standard transducer model packaged with different sealing materials.
2. The method of evaluating the insulating property of a sealing material for a transducer according to claim 1, wherein the structure of the transducer case is made of stainless steel.
3. The method of claim 1, wherein the piezoelectric ceramic is circular and the diameter of the plastic spacer is the same as the piezoelectric ceramic.
4. The method for evaluating the insulating property of a sealing material for a transducer according to claim 1, wherein the distance between the pads of both positive and negative electrodes of the piezoelectric ceramic is controlled to be 1 to 10 mm.
5. The method of claim 1, wherein the insulator is matched to the size of the hole in the transducer housing structure.
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| CN201811249852.9A CN109031078B (en) | 2018-10-25 | 2018-10-25 | Method for evaluating insulation performance of transducer sealing material |
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| CN201811249852.9A CN109031078B (en) | 2018-10-25 | 2018-10-25 | Method for evaluating insulation performance of transducer sealing material |
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| CN109031078B true CN109031078B (en) | 2020-05-15 |
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| CN105251087A (en) * | 2015-09-22 | 2016-01-20 | 成都巨智汇科技有限公司 | Medical ultrasonic nebulizer |
| CN106197854A (en) * | 2016-06-27 | 2016-12-07 | 宁德时代新能源科技股份有限公司 | Method and device for judging water inflow of battery pack |
| CN106249113A (en) * | 2016-08-18 | 2016-12-21 | 张春辉 | A kind of method to set up of equivalence transducer |
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| JP2012228858A (en) * | 2011-04-27 | 2012-11-22 | Nippon Steel Materials Co Ltd | Stainless steel foil with film and method for manufacturing the same |
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| US4700333A (en) * | 1985-05-16 | 1987-10-13 | The Stoneleigh Trust | Hydrophone design to overcome reduction in leakage resistance between electrode surface of transducer element assembly and the water in which the hydrophone is immersed |
| CN102543351A (en) * | 2012-03-15 | 2012-07-04 | 天长市曙光电子有限公司 | Process for machining electromagnetic coil of four-way valve |
| CN103364676A (en) * | 2012-04-09 | 2013-10-23 | 中电电气(上海)太阳能科技有限公司 | Wet electric leakage test device for solar-energy photovoltaic assembly |
| CN203350446U (en) * | 2013-06-18 | 2013-12-18 | 上海军信船舶科技有限公司 | Ship sonar transducer accelerated life test apparatus |
| CN203623395U (en) * | 2013-11-07 | 2014-06-04 | 观致汽车有限公司 | Battery management system for vehicle and vehicle |
| CN103595350A (en) * | 2013-11-26 | 2014-02-19 | 普德光伏技术（苏州）有限公司 | Photovoltaic module wetting electric leakage test method |
| CN204964122U (en) * | 2013-12-06 | 2016-01-13 | 福建省建筑科学研究院 | Photovoltaic component water proofness and insulation resistance , wet leakage current integration test platform |
| CN204575681U (en) * | 2015-04-12 | 2015-08-19 | 湘潭市华宇科技有限公司 | Insulating material insulating property detector guard warning circuit |
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| CN106197854A (en) * | 2016-06-27 | 2016-12-07 | 宁德时代新能源科技股份有限公司 | Method and device for judging water inflow of battery pack |
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Address after: No. 98, Guangyi new village, Liangxi District, Wuxi City, Jiangsu Province, 214000 Patentee after: HAIYING ENTERPRISE GROUP Co.,Ltd. Address before: 214000 Jiangsu province Binhu District of Wuxi City, No. 20 Liangxi road 18 Patentee before: HAIYING ENTERPRISE GROUP Co.,Ltd. |
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Address after: No. 188, Guangyi Road, Liangxi District, Wuxi City, Jiangsu Province, 214000 Patentee after: HAIYING ENTERPRISE GROUP Co.,Ltd. Address before: No. 98, Guangyi new village, Liangxi District, Wuxi City, Jiangsu Province, 214000 Patentee before: HAIYING ENTERPRISE GROUP Co.,Ltd. |