In a multi-frequency ultrasonic cleaner system, the transducer is one of the key components. It is necessary to have two resonant frequencies, and the impedance adjacent to its resonance point is close to reach the optimal transformation of electricity and sound.

 

在复频超声波清洁器体系中，换能器是要害组件之一，它有必要具有两个谐振频率，且在其谐振点邻近的阻抗要挨近，以到达电与声的最佳变换。

The sandwich type piezoelectric ceramic transducer has many resonance frequencies, that is, fundamental frequency oscillation, primary harmonic frequency, secondary harmonic frequency, and the like. According to the design theory of the ultrasonic cleaner sandwich composite transducer, by properly modifying the configuration of the transducer, it can operate at both the fundamental frequency and the primary harmonic, that is, the dual-frequency transducer. There are two types of oscillations of the dual-frequency transducer, the fundamental frequency oscillation is half wavelength, and there is one node in the transducer; and the harmonic oscillation is a full-wavelength structure, and the transducer has two nodes.

 

 

夹心式压电陶瓷换能器存在许多共振频率，即基频振荡、1次谐频、2次谐频等。根据超声波清洁器夹心式复合换能器的设计理论，通过恰当的改动换能器的构造形式，可使其既能作业于基频，又能作业于一次谐频，即双频换能器。双频换能器的振荡形式有两种，其基频振荡为半波长，换能器中有一个节点；而谐频振荡为全波长构造，换能器中具有两个节点。

In the two oscillation modes, the node orientation is different. According to the research on the influence of the orientation of the ceramic piece in the transducer of the ultrasonic cleaner on the transducer function, the piezoelectric ceramic piece is optimally placed on the oscillation node of the transducer. Adjacent. Thus, if the piezoelectric ceramic wafer is placed in the form of a conventional sandwich transducer, with respect to the half-wavelength oscillating form, it is possible that the ceramic wafer is adjacent to its oscillation node, and the ceramic wafer will violate its The node is oscillated to reduce the power capacity of the transducer.

 

 

这两种振荡形式，其节点方位是不一样的，根据超声波清洁器换能器中陶瓷片的方位对换能器功能影响的研究，压电陶瓷片最佳放置在换能器的振荡波节邻近。因而，若按传统的夹心式换能器形式，行将压电陶瓷晶片放在一同，关于半波长振荡形式，可能陶瓷晶片在其振荡节点邻近;关于全波长振荡形式，陶瓷片将违背其振荡节点，使换能器的功率容量降低。

In order to satisfy the two different oscillating forms for the orientation of the piezoelectric ceramic wafer, the piezoelectric ceramic wafer is divided into two groups, and the center is separated by metal members at an interval of 0, so that the transducers are oscillated in two different ways. In the form, the piezoelectric ceramic wafer is basically in the vicinity of the oscillation node, and its configuration is as shown in FIG. The front cover of the ultrasonic cleaner is made of metal aluminum and is made of horn type, adding radiation surface, improving radiation resistance (C water.S), reducing mechanical quality factor Q; rear cover and center \u0026ldquo; electrode\u0026rdquo; Selecting heavy metal 45. steel with low internal resistance, good fatigue resistance, high rigidity and certain toughness, specially modulated by high temperature,

 

 

为了满意两种不一样振荡形式对压电陶瓷晶片的方位摆放请求，将压电陶瓷晶片分红二组，中心用金属构件分隔/恰当0的间隔，使换能器在两种不一样的振荡形式中，压电陶瓷晶片基本上都处于振荡波节邻近，其构造形式如图1所示。超声波清洁器前盖板选用金属铝制成喇叭型，添加辐射面，进步辐射阻抗(C水.S)，降低机械品质因数Q;后盖板及中心“电极”选用内部功耗小，抗疲劳功能好，刚度高并有必定韧性的重金属45.钢，经特别高温调制而成，

Most of the energy is radiated from the early cover. The fundamental frequency of the dual-frequency transducer is measured by the nw-1232 frequency characteristic measuring instrument produced by Nanjing Instrument Factory, f1=29.2 kHz, and the first harmonic frequency f2=52.1 kHz. 9 dual-frequency ultrasonic cleaner transducers with the same frequency characteristics are bonded to超声波清洗机厂家 the bottom of the 300mmx300mmx180mm stainless steel cleaning tank, so that the 9 dual-frequency transducers and the cleaning tank form a complex frequency conversion resonance system, and the complex is measured. The fundamental frequency of the frequency conversion oscillation system is f1-1=27.6 kHz, and the first harmonic is f2-2=47.1 kHz.

 

 

使能量大部分早年盖板辐射。用南京仪器厂出产的nw-1232频率特性测量仪测得该双频换能器的基频f1=29.2 kHz，1次谐频f2=52.1 kHz。将9只一样频率特性的双频超声波清洁器换能器粘接在300mmx300mmx180mm的不锈钢清洁槽底部，使这9只双频换能器与清洁槽构成一个复频换能共振体系，测得该复频换能振荡体系的基频f1-1=27.6 kHz，1次谐频f2-2=47.1 kHz。

The two resonance frequencies of the ultrasonic transducer multi-frequency translating oscillation system are significantly lower than the two resonance frequencies of the single transducer, which may be related to the shape of the oscillation system and the individual parameters of the transducer, but the frequency band of the oscillation system Wide, which is conducive to the stability of the system