技术领域Technical Field
本发明涉及超声水表技术领域，尤其涉及一种应用于一体化超声水表的换能器设计、安装方法。The present invention relates to the technical field of ultrasonic water meters, and in particular to a design and installation method of a transducer applied to an integrated ultrasonic water meter.
背景技术Background technique
超声水表是通过检测超声波声束在水中顺流逆流传播时因速度发生变化而产生的时差，分析处理得出水的流速，从而进一步计算出水的流量的一种新式水表。其中，超声水表信号收发的核心器件是超声波换能器，超声波换能器可以将一定频率的电信号转换成声信号，也可以将声信号转换成电信号。超声波换能器的可靠性及寿命直接决定了超声水表的可靠性及寿命。Ultrasonic water meter is a new type of water meter that detects the time difference caused by the change in speed when the ultrasonic sound beam propagates downstream and upstream in the water, analyzes and processes the water flow rate, and further calculates the water flow rate. Among them, the core component of the ultrasonic water meter signal transmission and reception is the ultrasonic transducer, which can convert electrical signals of a certain frequency into acoustic signals, and can also convert acoustic signals into electrical signals. The reliability and life of the ultrasonic transducer directly determine the reliability and life of the ultrasonic water meter.
目前的一体化超声水表表体通常采用高硬度、高模量的高分子材料+玻璃纤维的复合材料等制造，以保证水表表体的结构强度。一体化超声水表的换能器是将压电陶瓷直接粘接在设计好的表体上的位置，相应的压电陶瓷下方表体管段的部分就起到换能器匹配层作用。但是匹配层较高的模量会导致匹配层和压电陶瓷之间产生比较大的应力，导致压电陶瓷面临开胶、退极化等问题，进一步导致换能器可靠性下降。The current integrated ultrasonic water meter body is usually made of high-hardness, high-modulus polymer materials + glass fiber composite materials to ensure the structural strength of the water meter body. The transducer of the integrated ultrasonic water meter is to directly bond the piezoelectric ceramics to the designed position on the meter body, and the corresponding part of the meter body pipe section below the piezoelectric ceramics acts as the transducer matching layer. However, the higher modulus of the matching layer will cause a relatively large stress between the matching layer and the piezoelectric ceramics, causing the piezoelectric ceramics to face problems such as debonding and depolarization, which further reduces the reliability of the transducer.
发明内容Summary of the invention
本发明针对现有技术存在的不足和缺陷，提供了一种应用于一体化超声水表的换能器设计、安装方法，改善了一体化超声水表换能器的可靠性问题。In view of the shortcomings and defects of the prior art, the present invention provides a design and installation method of a transducer applied to an integrated ultrasonic water meter, thereby improving the reliability problem of the integrated ultrasonic water meter transducer.
本发明的目的可以通过以下技术方案来实现。The purpose of the present invention can be achieved through the following technical solutions.
一种应用于一体化超声水表的换能器设计、安装方法，包括以下步骤。A design and installation method of a transducer applied to an integrated ultrasonic water meter includes the following steps.
S1：设计及注塑水表表体时，按照压电陶瓷尺寸，预留压电陶瓷限位槽，压电陶瓷限位槽内部有用于控制胶层厚度的限位台。S1: When designing and injection molding the water meter body, a piezoelectric ceramic limit groove is reserved according to the size of the piezoelectric ceramic. There is a limit platform inside the piezoelectric ceramic limit groove for controlling the thickness of the glue layer.
S2：在压电陶瓷限位槽内涂覆适量的胶水。S2: Apply an appropriate amount of glue in the piezoelectric ceramic limit groove.
将压电陶瓷安装在限位槽上，并给压电陶瓷施加适当的压力，使得胶水溢胶。Install the piezoelectric ceramics on the limiting groove and apply appropriate pressure to the piezoelectric ceramics to make the glue overflow.
S3：待胶水固化后，焊接压电陶瓷正负极信号线，形成完整的换能器，然后在换能器表面喷涂三防漆。S3: After the glue is cured, weld the positive and negative signal lines of the piezoelectric ceramic to form a complete transducer, and then spray conformal paint on the surface of the transducer.
优选地，所述压电陶瓷限位槽，其直径比压电陶瓷直径大0.3~1mm。Preferably, the diameter of the piezoelectric ceramic limiting groove is 0.3-1 mm larger than the diameter of the piezoelectric ceramic.
优选地，所述胶水为低模量胶水，胶水种类包括但不限于硅胶、环氧树脂胶、聚氨酯胶。Preferably, the glue is a low modulus glue, and the types of glue include but are not limited to silicone glue, epoxy resin glue, and polyurethane glue.
优选地，所述步骤S2中施加给压电陶瓷的压力为1~5N，确保压电陶瓷与限位台接触良好。Preferably, the pressure applied to the piezoelectric ceramic in step S2 is 1-5N to ensure good contact between the piezoelectric ceramic and the limiting platform.
优选地，所述步骤S2中的溢胶应填满压电陶瓷和压电陶瓷限位槽之间的缝隙；溢胶高度高于压电陶瓷厚度的一半，但低于压电陶瓷上表面。Preferably, the overflow glue in step S2 should fill the gap between the piezoelectric ceramic and the piezoelectric ceramic limiting groove; the overflow glue height is higher than half of the thickness of the piezoelectric ceramic, but lower than the upper surface of the piezoelectric ceramic.
优选地，所述限位台，其高度为100~300um，数量小于等于6个，且每个限位台的面积应小于等于2mm2。Preferably, the limit platforms have a height of 100-300 um, the number of the limit platforms is less than or equal to 6, and the area of each limit platform is less than or equal to 2 mm2 .
优选地，所述三防漆的喷涂范围应覆盖整个压电陶瓷及周围的溢胶。Preferably, the spraying range of the conformal coating should cover the entire piezoelectric ceramic and the surrounding overflow glue.
本发明的有益技术效果：通过匹配层结构、胶水结构及参数等设计，提高了一体化超声水表换能器的可靠性，同时降低了一体式超声水表换能器对压电陶瓷自身可靠性的要求，从而保证了一体化超声水表的长使用寿命。The beneficial technical effect of the present invention is as follows: through the design of matching layer structure, glue structure and parameters, the reliability of the integrated ultrasonic water meter transducer is improved, while the requirement of the integrated ultrasonic water meter transducer for the reliability of the piezoelectric ceramic itself is reduced, thereby ensuring the long service life of the integrated ultrasonic water meter.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明高可靠性换能器安装后的整体主视剖视图。FIG1 is an overall front cross-sectional view of the high reliability transducer of the present invention after installation.
图2为本发明高可靠性换能器安装后的整体俯视图。FIG. 2 is an overall top view of the high reliability transducer of the present invention after installation.
图3为本发明高可靠性换能器俯视图。FIG. 3 is a top view of the high reliability transducer of the present invention.
图4为本发明高可靠性换能器主视图。FIG. 4 is a front view of the high reliability transducer of the present invention.
附图标号：1为上游换能器，2为下游换能器，1-1为压电陶瓷，1-2为限位台，1-3为胶水，1-4为匹配层，1-5为压电陶瓷限位槽，1-6为焊点，1-7为导线。Figure numbers: 1 is the upstream transducer, 2 is the downstream transducer, 1-1 is the piezoelectric ceramic, 1-2 is the limit table, 1-3 is the glue, 1-4 is the matching layer, 1-5 is the piezoelectric ceramic limit groove, 1-6 is the welding point, and 1-7 is the wire.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不限定本发明。In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.
实施例1：一种应用于一体化超声水表的换能器设计、安装方法，制造、安装后的结构如图1~图4所示，包括压电陶瓷1-1、限位台1-2、胶水1-3、匹配层1-4、压电陶瓷限位槽1-5、焊点1-6、导线1-7。Embodiment 1: A transducer design and installation method for an integrated ultrasonic water meter. The structure after manufacturing and installation is shown in Figures 1 to 4, including a piezoelectric ceramic 1-1, a limit table 1-2, glue 1-3, a matching layer 1-4, a piezoelectric ceramic limit groove 1-5, a welding point 1-6, and a wire 1-7.
以超声水表的1MHz换能器为例，压电陶瓷1-1为圆形，厚度2±0.02mm，直径10±0.1mm。换能器和水表表体采用一体化方案，不再使用独立换能器，以提高水表表体的强度，降低超声水表的整体成本。Taking the 1MHz transducer of the ultrasonic water meter as an example, the piezoelectric ceramic 1-1 is circular, with a thickness of 2±0.02mm and a diameter of 10±0.1mm. The transducer and the water meter body are integrated, and an independent transducer is no longer used to improve the strength of the water meter body and reduce the overall cost of the ultrasonic water meter.
1号上游换能器的设计、安装方法包括以下步骤。The design and installation method of upstream transducer No. 1 includes the following steps.
S1：设计及注塑水表表体时，按照压电陶瓷1-1尺寸，预留压电陶瓷限位槽1-5，压电陶瓷限位槽1-5内部有用于控制胶层厚度的限位台1-2。S1: When designing and injection molding the water meter body, a piezoelectric ceramic limit groove 1-5 is reserved according to the size of the piezoelectric ceramic 1-1. The piezoelectric ceramic limit groove 1-5 has a limit platform 1-2 inside for controlling the thickness of the glue layer.
S2：在压电陶瓷限位槽1-5内涂覆适量的胶水1-3。S2: Apply a proper amount of glue 1-3 into the piezoelectric ceramic limiting groove 1-5.
将压电陶瓷1-1安装在限位槽上，并给压电陶瓷1-1施加适当的压力，使得胶水1-3溢胶。Install the piezoelectric ceramic 1 - 1 on the limiting groove, and apply appropriate pressure to the piezoelectric ceramic 1 - 1 to make the glue 1 - 3 overflow.
S3：待胶水1-3固化后，焊接压电陶瓷1-1正负极信号线，形成完整的换能器，然后在换能器表面喷涂三防漆。S3: After the glue 1-3 is cured, the positive and negative signal lines of the piezoelectric ceramic 1-1 are welded to form a complete transducer, and then conformal coating is sprayed on the surface of the transducer.
压电陶瓷限位槽1-5为圆形，深度h=1mm，直径d=10.3mm。压电陶瓷1-1安装时，压电陶瓷1-1和压电陶瓷限位槽1-5应同中心轴放置，使得压电陶瓷1-1和压电陶瓷限位槽1-5之间有一定的缝隙，避免压电陶瓷1-1和压电陶瓷限位槽1-5侧壁直接接触，从而避免压电陶瓷限位槽1-5对压电陶瓷1-1挤压而产生的水平方向的应力，降低压电陶瓷1-1的开胶和退极化风险。The piezoelectric ceramic limit groove 1-5 is circular, with a depth of h = 1mm and a diameter of d = 10.3mm. When the piezoelectric ceramic 1-1 is installed, the piezoelectric ceramic 1-1 and the piezoelectric ceramic limit groove 1-5 should be placed on the same central axis, so that there is a certain gap between the piezoelectric ceramic 1-1 and the piezoelectric ceramic limit groove 1-5 to avoid direct contact between the piezoelectric ceramic 1-1 and the side wall of the piezoelectric ceramic limit groove 1-5, thereby avoiding the horizontal stress caused by the piezoelectric ceramic limit groove 1-5 squeezing the piezoelectric ceramic 1-1, and reducing the risk of debonding and depolarization of the piezoelectric ceramic 1-1.
用于粘接压电陶瓷1-1和匹配层1-4的胶水1-3材料为硅胶，关键参数弹性模量为4±1MPa。压电陶瓷1-1和有机高分子材料的匹配层1-4的热膨胀系数相差5~20倍，当温度发生变化时，热膨胀系数的不同导致压电陶瓷1-1和匹配层1-4的形变量不同，从而导致压电陶瓷1-1和匹配层1-4之间产生应力；当水表表体受到外力冲击时，压电陶瓷1-1和匹配层1-4之间产生比较大的瞬时的剪切应力。使用低模量的硅胶，通过硅胶层的形变，可以吸收因温度变化或外力冲击导致的压电陶瓷1-1和匹配层1-4之间的应力，从而降低压电陶瓷1-1开胶和退极化的风险。The glue 1-3 used to bond the piezoelectric ceramic 1-1 and the matching layer 1-4 is made of silicone, and the key parameter elastic modulus is 4±1MPa. The thermal expansion coefficients of the piezoelectric ceramic 1-1 and the matching layer 1-4 made of organic polymer materials differ by 5 to 20 times. When the temperature changes, the difference in thermal expansion coefficients leads to different deformations of the piezoelectric ceramic 1-1 and the matching layer 1-4, which results in stress between the piezoelectric ceramic 1-1 and the matching layer 1-4; when the water meter body is impacted by external force, a relatively large instantaneous shear stress is generated between the piezoelectric ceramic 1-1 and the matching layer 1-4. Using low-modulus silicone, the stress between the piezoelectric ceramic 1-1 and the matching layer 1-4 caused by temperature changes or external force impacts can be absorbed through the deformation of the silicone layer, thereby reducing the risk of debonding and depolarization of the piezoelectric ceramic 1-1.
压电陶瓷1-1安装时，给压电陶瓷1-1的圆心施加5N的垂直向下的压力，使得所有限位台1-2与压电陶瓷1-1直接接触，因此限位台1-2的高度等于胶水1-3的厚度。When the piezoelectric ceramic 1-1 is installed, a vertical downward pressure of 5N is applied to the center of the piezoelectric ceramic 1-1, so that all the limit platforms 1-2 are in direct contact with the piezoelectric ceramic 1-1, so that the height of the limit platforms 1-2 is equal to the thickness of the glue 1-3.
所述步骤S2中的溢胶应填满压电陶瓷1-1和压电陶瓷限位槽1-5之间的缝隙，溢胶高度高于压电陶瓷1-1厚度的一半，但低于压电陶瓷1-1上表面。The overflowed glue in step S2 should fill the gap between the piezoelectric ceramic 1-1 and the piezoelectric ceramic limiting groove 1-5, and the overflowed glue height is higher than half of the thickness of the piezoelectric ceramic 1-1, but lower than the upper surface of the piezoelectric ceramic 1-1.
压电陶瓷限位槽1-5内部的边缘均匀分布四个正方形限位台1-2，单个限位台1-2面积为1mm2，高度为100um。在粘接过程中，限位台1-2支撑起压电陶瓷1-1，限位台1-2的高度等于胶水1-3的厚度，四个限位台1-2的面积为4mm2，由于限位台1-2和压电陶瓷1-1之间的胶水1-3厚度只有微米级别，因此在温度变化或者受到外界应力冲击时，限位台1-2和压电陶瓷1-1之间会产生比较大的应力，因此四个限位台1-2总面积控制在了4mm2。Four square limit platforms 1-2 are evenly distributed on the edge of the piezoelectric ceramic limit groove 1-5. The area of a single limit platform 1-2 is1mm2 and the height is 100um. During the bonding process, the limit platform 1-2 supports the piezoelectric ceramic 1-1. The height of the limit platform 1-2 is equal to the thickness of the glue 1-3. The area of the four limit platforms 1-2 is4mm2 . Since the thickness of the glue 1-3 between the limit platform 1-2 and the piezoelectric ceramic 1-1 is only at the micron level, when the temperature changes or is impacted by external stress, a relatively large stress will be generated between the limit platform 1-2 and the piezoelectric ceramic 1-1. Therefore, the total area of the four limit platforms 1-2 is controlled within4mm2 .
要降低压电陶瓷1-1和匹配层1-4之间的应力，除了使用低模量胶水外，使用适当的厚度的胶水也可以提高其吸收应力的效果。因此根据压电陶瓷1-1和匹配层1-4的形变量、胶水1-3的弹性模量及剪切强度，可以从仿真结果中上游换能器1的信号收发效率、压电陶瓷1-1和胶水1-3之间的应力、胶水1-3和匹配层1-4之间的应力等维度，评估得出最优的胶水厚度为100um。To reduce the stress between the piezoelectric ceramic 1-1 and the matching layer 1-4, in addition to using low modulus glue, using glue of appropriate thickness can also improve its stress absorption effect. Therefore, according to the deformation of the piezoelectric ceramic 1-1 and the matching layer 1-4, the elastic modulus and shear strength of the glue 1-3, the optimal glue thickness can be evaluated to be 100um from the dimensions of the signal transceiver efficiency of the upstream transducer 1, the stress between the piezoelectric ceramic 1-1 and the glue 1-3, and the stress between the glue 1-3 and the matching layer 1-4 in the simulation results.
通过焊点1-6与导线1-7焊接压电陶瓷1-1后，喷涂三防漆保护压电陶瓷1-1，三防漆应覆盖到整个压电陶瓷1-1及其周围的溢胶。压电陶瓷1-1的电极材质为银，且超声水表使用环境潮湿，使得压电陶瓷1-1的银电极容易被氧化。喷涂三防漆，可以隔绝水和空气，减缓了压电陶瓷1-1银电极的氧化速度，延长了压电陶瓷1-1的银电极寿命。After welding the piezoelectric ceramic 1-1 with the wire 1-7 through the welding point 1-6, the three-conformal paint is sprayed to protect the piezoelectric ceramic 1-1. The three-conformal paint should cover the entire piezoelectric ceramic 1-1 and the overflow glue around it. The electrode material of the piezoelectric ceramic 1-1 is silver, and the ultrasonic water meter is used in a humid environment, which makes the silver electrode of the piezoelectric ceramic 1-1 easily oxidized. Spraying the three-conformal paint can isolate water and air, slow down the oxidation rate of the silver electrode of the piezoelectric ceramic 1-1, and extend the life of the silver electrode of the piezoelectric ceramic 1-1.
下游换能器2同样根据上述内容进行设计、安装。The downstream transducer 2 is also designed and installed according to the above contents.
实施例2：一种应用于一体化超声水表的换能器设计、安装方法，制造、安装后的结构如图1~图4所示，包括压电陶瓷1-1、限位台1-2、胶水1-3、匹配层1-4、压电陶瓷限位槽1-5、焊点1-6、导线1-7。Embodiment 2: A transducer design and installation method for an integrated ultrasonic water meter. The structure after manufacturing and installation is shown in Figures 1 to 4, including a piezoelectric ceramic 1-1, a limit table 1-2, glue 1-3, a matching layer 1-4, a piezoelectric ceramic limit groove 1-5, a welding point 1-6, and a wire 1-7.
以超声水表的1MHz换能器为例，压电陶瓷1-1为圆形，厚度1±0.01mm，直径8±0.1mm。换能器和水表表体采用一体化方案，不再使用独立换能器，以提高水表表体的强度，降低超声水表的整体成本。Taking the 1MHz transducer of the ultrasonic water meter as an example, the piezoelectric ceramic 1-1 is circular, with a thickness of 1±0.01mm and a diameter of 8±0.1mm. The transducer and the water meter body are integrated, and an independent transducer is no longer used to improve the strength of the water meter body and reduce the overall cost of the ultrasonic water meter.
1号上游换能器的设计、安装方法包括以下步骤。The design and installation method of upstream transducer No. 1 includes the following steps.
S1：设计及注塑水表表体时，按照压电陶瓷1-1尺寸，预留压电陶瓷限位槽1-5，压电陶瓷限位槽1-5内部有用于控制胶层厚度的限位台1-2。S1: When designing and injection molding the water meter body, a piezoelectric ceramic limit groove 1-5 is reserved according to the size of the piezoelectric ceramic 1-1. The piezoelectric ceramic limit groove 1-5 has a limit platform 1-2 inside for controlling the thickness of the glue layer.
S2：在压电陶瓷限位槽1-5内涂覆适量的胶水1-3。S2: Apply a proper amount of glue 1-3 into the piezoelectric ceramic limiting groove 1-5.
将压电陶瓷1-1安装在限位槽上，并给压电陶瓷1-1施加适当的压力，使得胶水1-3溢胶。Install the piezoelectric ceramic 1 - 1 on the limiting groove, and apply appropriate pressure to the piezoelectric ceramic 1 - 1 to make the glue 1 - 3 overflow.
S3：待胶水1-3固化后，焊接压电陶瓷1-1正负极信号线，形成完整的换能器，然后在换能器表面喷涂三防漆。S3: After the glue 1-3 is cured, the positive and negative signal lines of the piezoelectric ceramic 1-1 are welded to form a complete transducer, and then conformal coating is sprayed on the surface of the transducer.
压电陶瓷限位槽1-5为圆形，深度h=500um，直径d=9mm。压电陶瓷1-1安装时，压电陶瓷1-1和压电陶瓷限位槽1-5应同中心轴放置，使得压电陶瓷1-1和压电陶瓷限位槽1-5之间有一定的缝隙，避免压电陶瓷1-1和压电陶瓷限位槽1-5侧壁直接接触，从而避免压电陶瓷限位槽1-5对压电陶瓷1-1挤压而产生的水平方向的应力，降低压电陶瓷1-1的开胶和退极化风险。The piezoelectric ceramic limit groove 1-5 is circular, with a depth of h = 500um and a diameter of d = 9mm. When the piezoelectric ceramic 1-1 is installed, the piezoelectric ceramic 1-1 and the piezoelectric ceramic limit groove 1-5 should be placed on the same central axis so that there is a certain gap between the piezoelectric ceramic 1-1 and the piezoelectric ceramic limit groove 1-5 to avoid direct contact between the piezoelectric ceramic 1-1 and the side wall of the piezoelectric ceramic limit groove 1-5, thereby avoiding the horizontal stress caused by the piezoelectric ceramic limit groove 1-5 squeezing the piezoelectric ceramic 1-1, and reducing the risk of debonding and depolarization of the piezoelectric ceramic 1-1.
用于粘接压电陶瓷1-1和匹配层1-4的胶水1-3材料为环氧树脂，关键参数弹性模量为800±100MPa。压电陶瓷1-1和有机高分子材料的匹配层1-4的热膨胀系数相差5~20倍，当温度发生变化时，热膨胀系数的不同导致压电陶瓷1-1和匹配层1-4的形变量不同，从而导致压电陶瓷1-1和匹配层1-4之间产生应力；当水表表体受到外力冲击时，压电陶瓷1-1和匹配层1-4之间产生比较大的瞬时的剪切应力。使用低模量的胶，通过胶层的形变，可以吸收因温度变化或外力冲击导致的压电陶瓷1-1和匹配层1-4之间的应力，从而降低压电陶瓷1-1开胶和退极化的风险。The glue 1-3 used to bond the piezoelectric ceramic 1-1 and the matching layer 1-4 is made of epoxy resin, and the key parameter elastic modulus is 800±100MPa. The thermal expansion coefficients of the piezoelectric ceramic 1-1 and the matching layer 1-4 made of organic polymer materials differ by 5 to 20 times. When the temperature changes, the difference in thermal expansion coefficients leads to different deformations of the piezoelectric ceramic 1-1 and the matching layer 1-4, which results in stress between the piezoelectric ceramic 1-1 and the matching layer 1-4; when the water meter body is impacted by external force, a relatively large instantaneous shear stress is generated between the piezoelectric ceramic 1-1 and the matching layer 1-4. Using a low modulus glue, the deformation of the glue layer can absorb the stress between the piezoelectric ceramic 1-1 and the matching layer 1-4 caused by temperature changes or external force impacts, thereby reducing the risk of debonding and depolarization of the piezoelectric ceramic 1-1.
压电陶瓷1-1安装时，给压电陶瓷1-1的圆心施加1N的垂直向下的压力，使得所有限位台1-2与压电陶瓷1-1直接接触，因此限位台1-2的高度等于胶水1-3的厚度。When the piezoelectric ceramic 1-1 is installed, a vertical downward pressure of 1N is applied to the center of the piezoelectric ceramic 1-1, so that all the limit platforms 1-2 are in direct contact with the piezoelectric ceramic 1-1, so that the height of the limit platforms 1-2 is equal to the thickness of the glue 1-3.
所述步骤S2中的溢胶应填满压电陶瓷1-1和压电陶瓷限位槽1-5之间的缝隙，溢胶高度高于压电陶瓷1-1厚度的一半，但低于压电陶瓷1-1上表面。The overflow glue in step S2 should fill the gap between the piezoelectric ceramic 1-1 and the piezoelectric ceramic limiting groove 1-5, and the overflow glue height is higher than half of the thickness of the piezoelectric ceramic 1-1, but lower than the upper surface of the piezoelectric ceramic 1-1.
压电陶瓷限位槽1-5内部的边缘均匀分布四个正方形限位台1-2，单个限位台1-2面积为1mm2，高度为300um。在粘接过程中，限位台1-2支撑起压电陶瓷1-1，限位台1-2的高度等于胶水1-3的厚度，四个限位台1-2的面积为4mm2，由于限位台1-2和压电陶瓷1-1之间的胶水1-3厚度只有微米级别，因此在温度变化或者受到外界应力冲击时，限位台1-2和压电陶瓷1-1之间会产生比较大的应力，因此四个限位台1-2总面积控制在了4mm2。Four square limit platforms 1-2 are evenly distributed on the edge of the inner part of the piezoelectric ceramic limit groove 1-5. The area of a single limit platform 1-2 is1mm2 and the height is 300um. During the bonding process, the limit platform 1-2 supports the piezoelectric ceramic 1-1. The height of the limit platform 1-2 is equal to the thickness of the glue 1-3. The area of the four limit platforms 1-2 is4mm2 . Since the thickness of the glue 1-3 between the limit platform 1-2 and the piezoelectric ceramic 1-1 is only at the micron level, when the temperature changes or is impacted by external stress, a relatively large stress will be generated between the limit platform 1-2 and the piezoelectric ceramic 1-1. Therefore, the total area of the four limit platforms 1-2 is controlled within4mm2 .
要降低压电陶瓷1-1和匹配层1-4之间的应力，除了使用低模量胶水外，使用适当的厚度的胶水也可以提高其吸收应力的效果。因此根据压电陶瓷1-1和匹配层1-4的形变量、胶水1-3的弹性模量及剪切强度，可以从仿真结果中上游换能器1的信号收发效率、压电陶瓷1-1和胶水1-3之间的应力、胶水1-3和匹配层1-4之间的应力等维度，评估得出最优的胶水厚度为300um。To reduce the stress between the piezoelectric ceramic 1-1 and the matching layer 1-4, in addition to using low modulus glue, using glue of appropriate thickness can also improve its stress absorption effect. Therefore, according to the deformation of the piezoelectric ceramic 1-1 and the matching layer 1-4, the elastic modulus and shear strength of the glue 1-3, the optimal glue thickness can be evaluated to be 300um from the dimensions of the signal transceiver efficiency of the upstream transducer 1, the stress between the piezoelectric ceramic 1-1 and the glue 1-3, and the stress between the glue 1-3 and the matching layer 1-4 in the simulation results.
通过焊点1-6与导线1-7焊接压电陶瓷1-1后，喷涂三防漆保护压电陶瓷1-1，三防漆应覆盖到整个压电陶瓷1-1及其周围的溢胶。压电陶瓷1-1的电极材质为银，且超声水表使用环境潮湿，使得压电陶瓷1-1的银电极容易被氧化。喷涂三防漆，可以隔绝水和空气，减缓了压电陶瓷1-1银电极的氧化速度，延长了压电陶瓷1-1的银电极寿命。After welding the piezoelectric ceramic 1-1 with the wire 1-7 through the welding point 1-6, the three-conformal paint is sprayed to protect the piezoelectric ceramic 1-1. The three-conformal paint should cover the entire piezoelectric ceramic 1-1 and the overflow glue around it. The electrode material of the piezoelectric ceramic 1-1 is silver, and the ultrasonic water meter is used in a humid environment, which makes the silver electrode of the piezoelectric ceramic 1-1 easily oxidized. Spraying the three-conformal paint can isolate water and air, slow down the oxidation rate of the silver electrode of the piezoelectric ceramic 1-1, and extend the life of the silver electrode of the piezoelectric ceramic 1-1.
下游换能器2同样根据上述内容进行设计、安装。The downstream transducer 2 is also designed and installed according to the above contents.
上述实施例是对本发明的具体实施方式的说明，而非对本发明的限制，有关技术领域的技术人员在不脱离本发明的精神和范围的情况下，还可做出各种变换和变化以得到相对应的等同的技术方案，因此所有等同的技术方案均应归入本发明的专利保护范围。The above embodiments are descriptions of specific implementation methods of the present invention rather than limitations of the present invention. Technical personnel in the relevant technical field may make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.
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| CN202410673329.8ACN118555895A (en) | 2023-11-07 | 2023-11-07 | Integrated ultrasonic water meter |
| CN202311464696.9ACN117222298B (en) | 2023-11-07 | 2023-11-07 | Transducer design and installation method applied to integrated ultrasonic water meter |
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