CN111141344A - An ultrasonic water meter transducer and its ultrasonic water meter - Google Patents

Abstract

Translated fromChinese

本发明公开了一种超声水表换能器及其超声水表，包括外壳和声波组件，外壳为盲孔结构，声波组件包括第一压电陶瓷片和第二压电陶瓷片，第一、二压电陶瓷片位于盲孔底部，且第一、二压电陶瓷片之间设置有间隔，第一、二压电陶瓷片均可独立产生和接收超声波。该发明中，一对换能器可以采用两路声道对流速进行检测，结构简单，而且提供两组数据进行计算，达到了计算精准的效果。

The invention discloses an ultrasonic water meter transducer and an ultrasonic water meter thereof, comprising a casing and an acoustic wave assembly, wherein the casing is a blind hole structure, and the acoustic wave assembly comprises a first piezoelectric ceramic sheet and a second piezoelectric ceramic sheet. The electric ceramic sheet is located at the bottom of the blind hole, and an interval is set between the first and second piezoelectric ceramic sheets, and the first and second piezoelectric ceramic sheets can independently generate and receive ultrasonic waves. In the invention, a pair of transducers can use two channels to detect the flow velocity, the structure is simple, and two sets of data are provided for calculation, which achieves the effect of accurate calculation.

Description

Ultrasonic water meter transducer and ultrasonic water meter thereof

Technical Field

The invention relates to the technical field of water meters, in particular to an ultrasonic water meter transducer and an ultrasonic water meter thereof.

Background

In the field of ultrasonic water meters, with the continuous updating of chip technology, an ultrasonic water meter pipe section becomes a core component of the ultrasonic water meter, and an ultrasonic water meter transducer becomes a key which directly influences the measurement repeatability and the measurement precision of the ultrasonic water meter.

In an ultrasonic water meter, a sonic component located upstream and downstream of the ultrasonic meter pipe section is used as a sensing component for generating and receiving ultrasonic waves in the water. The ultrasonic water meter measures and calculates the speed of water flow in a pipeline by generating and receiving ultrasonic waves in water and analyzing the time and time difference of the generated and received ultrasonic waves in the working process.

The time when the electric signal for exciting the circular piezoelectric ceramic piece reaches the piezoelectric ceramic piece and the time when the piezoelectric ceramic piece receives the electric signal to generate ultrasonic waves are not constant time but have certain fluctuation, and the fluctuation time can influence the time difference of water flow calculation. Particularly, under the condition that the electric quantity of a circuit power supply battery is low or the piezoelectric ceramic piece is aged, the fluctuation time is calculated into a time difference, so that the calculation of the water flow speed in a real pipeline is influenced, and the flow error repeatability of the ultrasonic water meter fluctuates.

The common ultrasonic water meter transducer only adopts a whole-circle piezoelectric ceramic piece, and a pair of ultrasonic water meter transducers can only be used as a single sound channel. And the number of the ultrasonic water meter transducers can be increased only in pairs when the sound channels are increased. And the flow field of the ultrasonic water meter pipe section is adversely affected by increasing the number of pairs of the ultrasonic water meter transducer. And in the ultrasonic water meter with a smaller caliber, the number of pairs of the transducers of the ultrasonic water meter cannot be increased.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides an ultrasonic water meter transducer and an ultrasonic water meter thereof.

In order to achieve the purpose, the invention provides the following technical scheme:

in a first aspect, the invention provides an ultrasonic water meter transducer, which comprises a shell and an acoustic wave component, wherein the shell is of a blind hole structure, the acoustic wave component comprises a first piezoelectric ceramic piece and a second piezoelectric ceramic piece, the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are positioned at the bottom of the blind hole, a gap is arranged between the first piezoelectric ceramic piece and the second piezoelectric ceramic piece, and the first piezoelectric ceramic piece and the second piezoelectric ceramic piece can independently generate and receive ultrasonic waves.

Furthermore, a sealing glue layer is arranged at the upper opening of the blind hole in the shell.

Furthermore, the upper and lower surfaces of the first and second piezoelectric ceramic plates are provided with metal layers.

Furthermore, the upper surfaces of the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet are respectively provided with a positive electrode and a negative electrode, the positive electrode and the negative electrode are respectively provided with a lead, and the leads penetrate through the sealing adhesive layer to be connected with a signal wire in the ultrasonic water meter.

Furthermore, the first piezoelectric ceramic piece is formed by cutting a circular piezoelectric ceramic piece, and the rest part is a second piezoelectric ceramic piece.

Furthermore, the first piezoelectric ceramic piece and the second piezoelectric ceramic piece are of semicircular structures with the same size.

Furthermore, the first and second piezoelectric ceramic pieces are concentric fan-shaped structures, and the first and second piezoelectric ceramic pieces are different in size.

Further, the first and second piezoceramic wafers are in the shape of a sector with central angles of 120 degrees and 240 degrees.

In a second aspect, the present invention provides an ultrasonic water meter comprising a housing and a pair of reflectors inserted in the housing, and two ultrasonic water meter transducers as claimed in any one ofclaims 1 to 8, the ultrasonic water meter transducers being disposed on the housing at positions corresponding to the reflectors.

Furthermore, the piezoelectric ceramic pieces in the ultrasonic water meter transducer are of two same semicircular structures, and two parts of the ultrasonic water meter, which are formed by cutting the same circular piezoelectric ceramic piece, are respectively placed in the two ultrasonic transducers of the same ultrasonic water meter.

Compared with the prior art, the invention has the beneficial effects that: the two channels of sound channels can be used for monitoring the flow velocity on the pair of transducers, two kinds of data are provided for reference, the structure is simple, and the effect of accurate calculation can be achieved.

Drawings

FIG. 1 is a schematic structural diagram of an ultrasonic transducer according to the present invention;

fig. 2 to 4 are schematic structural views of an acoustic wave device according to the present invention;

fig. 5 is a schematic structural diagram of the present invention.

Detailed Description

The present invention will now be described in more detail with reference to the accompanying drawings, in which the description of the invention is given by way of illustration and not of limitation. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a number" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

As shown in fig. 1, the invention provides an ultrasonic water meter transducer, which comprises ahousing 1 and anacoustic wave component 2, wherein thehousing 1 is set to be a blind hole structure, theacoustic wave component 2 is composed of a first piezoelectricceramic piece 201 and a second piezoelectricceramic piece 202, the wholeacoustic wave component 2 is arranged at the bottom of the blind hole, the two piezoelectric ceramic pieces are arranged in parallel, a certain gap is arranged between the first piezoelectricceramic piece 201 and the second piezoelectricceramic piece 202, and the two piezoelectric ceramic pieces can independently generate and receive ultrasonic waves.

As shown in fig. 2, when the first piezoelectricceramic plate 201 emits an ultrasonic wave, a part of the ultrasonic wave is reflected by the transducer housing to the second piezoelectricceramic plate 202, and a signal received by the second piezoelectricceramic plate 202 can be used as a feedback signal for completing the transmission of the ultrasonic wave, so that the ultrasonic transmission time can be more accurately represented, and a timing error caused by a circuit and the response time of the piezoelectric ceramic plate can be eliminated from the time when the second piezoelectricceramic plate 202 receives the signal transmitted by the first piezoelectricceramic plate 201.

And the upper opening of the blind hole in theshell 1 is provided with asealant layer 4 which plays a role in sealing the transducer. The upper and lower surfaces of the first piezoelectricceramic piece 201 and the second piezoelectricceramic piece 202 are both provided with metal layers, the upper surfaces of the two piezoelectric ceramic pieces are both provided with positive and negative electrodes, each positive electrode or negative electrode is connected with alead 3, and thelead 3 passes through theadhesive sealing layer 4 to be connected with a signal line in the ultrasonic water meter.

The size of the sound wave energy is in direct proportion to the emitting area of the piezoelectric ceramic piece, in order to generate and receive the sound wave energy to the maximum extent, the first piezoelectricceramic piece 201 is formed by cutting a circular piezoelectric ceramic piece, the rest part is used as the second piezoelectricceramic piece 202, the diameter of the circular piezoelectric ceramic piece is consistent with the diameter of the inner cavity of the transducer shell, and the sectional area of the transducer shell is utilized to the maximum extent.

The firstpiezoceramic sheet 201 and the secondpiezoceramic sheet 202 may be the same size or different sizes.

As shown in fig. 3, in order to obtain sound wave signals with different frequencies in the same ultrasonic water meter transducer, the piezoelectric ceramic plate may be cut into two pieces with different sizes, and the cut piezoelectric ceramic plate may generate different sound wave frequencies. Therefore, sound waves with different frequencies can be generated in the same transducer at the same time, so that time comparison parameters of the sound waves passing through the same water flow are obtained. Because the sound waves with different frequencies are generated, the first piezoelectricceramic piece 201 and the second piezoelectricceramic piece 202 can emit sound wave signals at the same time, the two paths of signals cannot interfere with each other, and the time data of the same flow field in the ultrasonic water meter pipe section can be obtained through comparison of two groups of data generated by the two paths of signals.

As shown in fig. 4, the same circular piezoelectric ceramic plate is cut into two concentric sectors with center angles of 120 degrees and 240 degrees, so that two paths of sound wave channels distributed at multiple rates can be obtained, and different sound wave channels can be more easily identified during circuit design.

As shown in fig. 5, the present invention further provides an ultrasonic water meter, which includes ahousing 5, a pair ofreflection devices 6 inserted in thehousing 5, and a pair of ultrasonic water meter transducers, wherein the ultrasonic water meter transducers are located above thereflection devices 6, and the transducers are in one-to-one correspondence with thereflection devices 6.

Because the parameters of sound waves of the two semicircular piezoelectric ceramic pieces cut out from the same round piezoelectric ceramic piece are the closest, and the sound wave resonance phenomenon is the most ideal, the two semicircular piezoelectric ceramic pieces cut out from the same round piezoelectric ceramic piece can be respectively installed in the two ultrasonic water meter transducers of the same ultrasonic water meter, and the two semicircular piezoelectric ceramic pieces can absorb and excite the sound waves most effectively. Namely, the piezoelectricceramic sheet 2011 and the piezoelectricceramic sheet 2012 cut by the same piezoelectric ceramic sheet are respectively positioned in two opposite transducers of the pipe section, and the piezoelectricceramic sheet 2021 and the piezoelectricceramic sheet 2022 cut by the other piezoelectric ceramic sheet are also respectively positioned in the same two opposite transducers of the pipe section. The piezoelectricceramic sheet 2011 and the piezoelectricceramic sheet 2012 form an acoustic path to transmit and receive ultrasonic signals to and from each other; the piezoelectricceramic plate 2021 and the piezoelectricceramic plate 2022 form a sound wave path, and transmit and receive ultrasonic signals to and from each other.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

Translated fromChinese

1.一种超声水表换能器，包括外壳和声波组件，其特征在于：所述外壳为盲孔结构，所述声波组件包括第一压电陶瓷片和第二压电陶瓷片，所述第一、二压电陶瓷片位于盲孔底部，且第一、二压电陶瓷片之间设置有间隔，所述第一、二压电陶瓷片均可独立产生和接收超声波。1. An ultrasonic water meter transducer, comprising a casing and an acoustic wave assembly, characterized in that: the casing is a blind hole structure, and the acoustic wave assembly comprises a first piezoelectric ceramic sheet and a second piezoelectric ceramic sheet, the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet. The first and second piezoelectric ceramic sheets are located at the bottom of the blind hole, and an interval is set between the first and second piezoelectric ceramic sheets, and the first and second piezoelectric ceramic sheets can independently generate and receive ultrasonic waves.2.根据权利要求1所述的一种超声水表换能器，其特征在于：所述外壳中盲孔上口设置有封胶层。2 . The ultrasonic water meter transducer according to claim 1 , wherein the upper opening of the blind hole in the casing is provided with a sealing layer. 3 .3.根据权利要求1所述的一种超声水表换能器，其特征在于：所述第一、二压电陶瓷片的上、下表面均设置有金属层。3 . The ultrasonic water meter transducer according to claim 1 , wherein the upper and lower surfaces of the first and second piezoelectric ceramic sheets are provided with metal layers. 4 .4.根据权利要求3所述的一种超声水表换能器，其特征在于：所述第一、二压电陶瓷片上表面均设置有正、负电极，所述正、负电极上各设置一根导线，所述导线穿过封胶层与超声水表中的信号线相连。4. An ultrasonic water meter transducer according to claim 3, characterized in that: the upper surfaces of the first and second piezoelectric ceramic sheets are provided with positive and negative electrodes, and a positive electrode and a negative electrode are each provided with a A wire is connected to the signal wire in the ultrasonic water meter through the sealing layer.5.根据权利要求4所述的一种超声水表换能器，其特征在于：所述第一压电陶瓷片由圆形压电陶瓷片切割而成，且剩余部分为第二压电陶瓷片。5 . The ultrasonic water meter transducer according to claim 4 , wherein the first piezoelectric ceramic sheet is cut from a circular piezoelectric ceramic sheet, and the remaining part is the second piezoelectric ceramic sheet. 6 . .6.根据权利要求5所述的一种超声水表换能器，其特征在于：所述第一、二压电陶瓷片为相同大小的半圆结构。6 . The ultrasonic water meter transducer according to claim 5 , wherein the first and second piezoelectric ceramic sheets are semicircular structures of the same size. 7 .7.根据权利要求5所述的一种超声水表换能器，其特征在于：所述第一、二压电陶瓷片为同圆心的扇形结构，且第一、二压电陶瓷片大小不同。7 . The ultrasonic water meter transducer according to claim 5 , wherein the first and second piezoelectric ceramic sheets are concentric fan-shaped structures, and the first and second piezoelectric ceramic sheets are different in size. 8 .8.根据权利要求7所述的一种超声水表换能器，其特征在于：所述第一、二压电陶瓷片为中心角为120度和240度的扇形。8 . The ultrasonic water meter transducer according to claim 7 , wherein the first and second piezoelectric ceramic sheets are fan-shaped with central angles of 120 degrees and 240 degrees. 9 .9.一种超声水表，包括壳体和插设在壳体内的一对反射装置，其特征在于：还包括两个如权利要求1至8任一所述的超声水表换能器，所述超声水表换能器设置在壳体上对应于反射装置的位置。9. An ultrasonic water meter, comprising a housing and a pair of reflection devices inserted in the housing, characterized in that: further comprising two ultrasonic water meter transducers according to any one of claims 1 to 8, the ultrasonic The water meter transducer is arranged on the housing at a position corresponding to the reflection device.10.根据权利要求9所述的一种超声水表，其特征在于：所述超声水表换能器中的压电陶瓷片为两个相同的半圆结构，且所述超声水表中属于同一个圆形压电陶瓷片切割而成的两部分分别放置在同个超声水表的两个超声换能器中。10 . The ultrasonic water meter according to claim 9 , wherein the piezoelectric ceramic sheets in the ultrasonic water meter transducer are two identical semicircular structures, and the ultrasonic water meter belongs to the same circular shape. 11 . The two parts cut from the piezoelectric ceramic sheet are respectively placed in the two ultrasonic transducers of the same ultrasonic water meter.

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