Ultrasonic water meter transducer and ultrasonic water meter

Abstract

The utility model relates to the technical field of ultrasonic water meters, in particular to an ultrasonic water meter transducer which comprises a shell with an opening, and a PCB (printed circuit board), a piezoelectric ceramic piece and a matching layer which are arranged in the shell, the PCB is arranged on the positive electrode face of the piezoelectric ceramic piece, and the matching layer is arranged on the negative electrode face of the piezoelectric ceramic piece. The matching layer comprises a first matching layer and a second matching layer, the first matching layer is arranged on the negative electrode face of the piezoelectric ceramic piece, the second matching layer is arranged on the first matching layer, and the acoustic impedance of the second matching layer is smaller than that of the first matching layer. According to the transducer, the matching layer is additionally arranged, the bandwidth of the transducer of the ultrasonic water meter is increased, the frequency range of ultrasonic signals capable of being received by the transducer of the ultrasonic water meter is expanded, then the performance of the transducer of the ultrasonic water meter is improved, and the measurement accuracy and resolution are improved when the water meter is measured.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic water meter technology, and in particular to an ultrasonic water meter transducer and an ultrasonic water meter. Background Technology

[0002] Ultrasonic water meters, with their advantages of high-precision measurement, non-invasiveness, long-term stability, adaptability, and intelligent management, have become one of the most valuable electronic water meters currently available. The ultrasonic transducer, as the core component of an ultrasonic water meter, largely determines the accuracy of its measurement and its long-term operational stability.

[0003] Currently, existing ultrasonic water meter transducers typically use a single layer of material as the matching layer, resulting in a low bandwidth and a narrow range of ultrasonic signal frequencies that the transducer can receive. Therefore, existing ultrasonic water meter transducers suffer from the problem of low bandwidth. Utility Model Content

[0004] This application provides an ultrasonic water meter transducer and an ultrasonic water meter, solving the technical problem of low bandwidth in existing ultrasonic water meter transducers. By adding a matching layer, the bandwidth of the ultrasonic water meter transducer is increased, expanding the range of ultrasonic signal frequencies that the ultrasonic water meter transducer can receive, thereby improving the performance of the ultrasonic water meter transducer and enhancing the accuracy and resolution of water meter measurements.

[0005] In a first aspect, this utility model provides an ultrasonic water meter transducer, comprising: a housing with an opening, and a PCB board, a piezoelectric ceramic sheet, and a matching layer disposed within the housing;

[0006] The PCB board is provided on the positive electrode surface of the piezoelectric ceramic sheet, and the matching layer is provided on the negative electrode surface of the piezoelectric ceramic sheet;

[0007] The matching layer includes a first matching layer and a second matching layer. The first matching layer is disposed on the negative electrode surface of the piezoelectric ceramic sheet, and the second matching layer is disposed on the first matching layer. The acoustic impedance of the second matching layer is less than that of the first matching layer.

[0008] Optionally, the piezoelectric ceramic sheet includes a protrusion, which is welded to the negative electrode surface of the piezoelectric ceramic sheet.

[0009] Optionally, it also includes: tin-plated copper wire, one end of which is disposed on the protrusion and the other end is connected to the negative electrode pad of the PCB board.

[0010] Optionally, the first matching layer includes a recess, which is disposed corresponding to the protrusion.

[0011] Optionally, the PCB board includes a positive electrode pad and a negative electrode pad, the positive electrode pad and the negative electrode pad are disposed on the back side of the PCB board, and the front side of the PCB board is bonded to the positive electrode surface of the piezoelectric ceramic sheet by conductive adhesive.

[0012] Optionally, the PCB board is provided with a positive electrode via, which is correspondingly provided with the positive electrode pad. The positive electrode via is used to guide the positive electrode signal of the piezoelectric ceramic sheet to the positive electrode pad.

[0013] Optionally, it also includes: a signal line, the first end of which is connected to the positive pad and the negative pad of the PCB board respectively, and the second end of which is led out from the opening of the housing.

[0014] Optionally, it also includes: a backing, which is disposed corresponding to the opening of the housing, and the backing and the housing form a closed cavity; the PCB board, the piezoelectric ceramic sheet, the matching layer and the first end of the signal line are all disposed on the backing and disposed in the cavity, and the second end of the signal line is led out through the through hole of the backing.

[0015] Optionally, the acoustic impedance range of the first matching layer is 6.5-8 Mrayl, and the acoustic impedance range of the second matching layer is 1.5-3 Mrayl.

[0016] Based on the same inventive concept, in a second aspect, this utility model also provides an ultrasonic water meter, comprising: an ultrasonic water meter transducer as described in the first aspect.

[0017] One or more technical solutions in the embodiments of this utility model have at least the following technical effects or advantages:

[0018] In this embodiment of the invention, by setting a double matching layer on the piezoelectric ceramic sheet, the acoustic impedance of the second matching layer is less than that of the first matching layer, thus achieving a wide bandwidth for the ultrasonic water meter transducer. This increases the range of ultrasonic signals that the ultrasonic water meter transducer can receive, allowing it to receive more ultrasonic signals of different frequencies. Firstly, when measuring water, the wide bandwidth ultrasonic water meter transducer improves measurement accuracy and resolution, ensuring accurate measurement of the water flow through the pipe, and also helps capture and distinguish ultrasonic reflections under different speed and flow conditions. Secondly, the wider bandwidth ultrasonic water meter transducer can resist interference from external environments, such as noise and other ultrasonic sources, ensuring stable and reliable operation of the water meter. Furthermore, by setting a PCB board, a piezoelectric ceramic sheet, and a matching layer within the housing, with the PCB board positioned on the positive electrode surface of the piezoelectric ceramic sheet and the double matching layer positioned on the negative electrode surface, the ultrasonic water meter transducer offers advantages such as improved space utilization, reduced overall size, and high integration. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference figures denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 A schematic diagram of the external structure of the ultrasonic water meter transducer in an embodiment of this utility model is shown;

[0021] Figure 2 A schematic diagram of the explosion-proof structure of the ultrasonic water meter transducer in an embodiment of this utility model is shown;

[0022] Figure 3 A schematic diagram of the structure of the piezoelectric ceramic sheet and the first matching layer in an embodiment of the present invention is shown;

[0023] Figure 4 A schematic diagram of the structure of the piezoelectric ceramic sheet and PCB board in an embodiment of this utility model is shown;

[0024] Figure 5 A schematic diagram of the signal line structure in an embodiment of this utility model is shown.

[0025] In the attached drawings, 110 is the housing; 120 is the PCB board; 130 is the piezoelectric ceramic sheet; 140 is the mating layer; 121 is the negative pad; 122 is the positive pad; 123 is the positive via; 131 is the protrusion; 141 is the first mating layer; 142 is the second mating layer; 143 is the recess; 150 is the tinned copper wire; 160 is the signal line; and 170 is the backing. Detailed Implementation

[0026] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0027] Example 1

[0028] The first embodiment of this utility model provides an ultrasonic water meter transducer, such as... Figure 1 and Figure 2 As shown, the device includes: a housing 110 with an opening, and a PCB (Printed Circuit Board) 120, a piezoelectric ceramic sheet 130, and a matching layer 140 disposed within the housing 110. The PCB 120 is disposed on the positive electrode surface of the piezoelectric ceramic sheet 130, and the matching layer 140 is disposed on the negative electrode surface of the piezoelectric ceramic sheet 130. The matching layer 140 includes a first matching layer 141 and a second matching layer 142. The first matching layer 141 is disposed on the negative electrode surface of the piezoelectric ceramic sheet 130, and the second matching layer 142 is disposed on the first matching layer 141. The acoustic impedance of the second matching layer 142 is less than that of the first matching layer 141.

[0029] In this embodiment, by setting a double matching layer on the piezoelectric ceramic sheet 130, the acoustic impedance of the second matching layer 142 is less than that of the first matching layer 141, thus achieving a wide bandwidth for the ultrasonic water meter transducer. This increases the range of ultrasonic signals that the ultrasonic water meter transducer can receive, allowing it to receive more ultrasonic signals of different frequencies. First, when measuring water, the wide bandwidth ultrasonic water meter transducer can improve the accuracy and resolution of the measurement, ensuring accurate measurement of the water flowing through the pipe, while also helping to capture and distinguish ultrasonic reflections under different speed and flow conditions. Second, the wider bandwidth ultrasonic water meter transducer can resist interference from external environments, such as noise and other ultrasonic sources, ensuring stable and reliable operation of the water meter. Furthermore, a PCB board 120, a piezoelectric ceramic sheet 130, and a matching layer 140 are arranged inside the housing 110. The PCB board 120 is arranged on the positive electrode surface of the piezoelectric ceramic sheet 130, and the double matching layer is arranged on the negative electrode surface of the piezoelectric ceramic sheet 130, which gives the ultrasonic water meter transducer advantages such as improved space utilization, reduced overall size, and high integration.

[0030] Below, in conjunction with Figure 1 and Figure 2 The structure of the ultrasonic water meter transducer in this embodiment is described in detail:

[0031] like Figure 3As shown, the piezoelectric ceramic sheet 130 includes a protrusion 131, which is welded to the negative electrode surface of the piezoelectric ceramic sheet 130. The protrusion is used to match and fit with the recess 143 on the first matching layer 141, so that the first matching layer 141 and the piezoelectric ceramic sheet 130 are tightly attached, improving the performance of the ultrasonic water meter transducer, ensuring the reliability and stability of the ultrasonic water meter transducer during use, and avoiding the situation where the two are not tightly attached, resulting in a decrease in performance. In addition, the material of the piezoelectric ceramic sheet 130 includes, but is not limited to, PZT series materials, such as PZT-5H piezoelectric material. PZT is an abbreviation for a composite oxide of lead (Pb), zirconium (Zr), and titanium (Ti) (Pb(Zr,Ti)O3). PZT-5H piezoelectric material has the advantages of being able to generate a large ultrasonic signal at a low driving voltage, while being able to sensitively detect the ultrasonic signal and convert it into an electrical signal, and maintaining stable performance under different temperature conditions.

[0032] like Figure 3 As shown, the first matching layer 141 includes a recess 143, which is correspondingly disposed to the protrusion 131. The function of the recess 143 is to match and fit with the protrusion 131 of the piezoelectric ceramic sheet 130, so that the first matching layer 141 is tightly attached to the negative electrode surface of the piezoelectric ceramic sheet 130. By setting the protrusion 131 on the negative electrode surface of the piezoelectric ceramic sheet 130 and the recess 143 on the first matching layer 141, the first matching layer 141 and the piezoelectric ceramic sheet 130 are tightly attached, which improves the performance of the ultrasonic water meter transducer, ensures the reliability and stability of the ultrasonic water meter transducer during use, and avoids uneven adhesion between the first matching layer and the piezoelectric ceramic sheet 130, which would affect the performance of the ultrasonic water meter transducer.

[0033] like Figure 4 As shown, the PCB board 120 includes a negative electrode pad 121 and a positive electrode pad 122. The negative electrode pad 121 and the positive electrode pad 122 are disposed on the back side of the PCB board 120, and the front side of the PCB board 120 is bonded to the positive electrode surface of the piezoelectric ceramic sheet 130 using conductive adhesive. Directly setting two pads, the negative electrode pad 121 and the positive electrode pad 122, on the PCB board 120 simplifies the design of the PCB board 120, improves the utilization rate of the PCB board 120, and enhances the reliability and stability of the PCB board 120. The size, shape, position, and other parameters of the negative electrode pad 121 and the positive electrode pad 122 can be set according to actual requirements. Figure 4 As shown, the negative pad 121 and the positive pad 122 can be semi-circular in shape, and their positions can be set opposite each other with a certain empty area in between, so that the circuit of the negative pad 121 and the circuit of the positive pad 122 can be clearly distinguished, which facilitates the connection of the circuit and enhances the reliability and stability of the PCB board 120.

[0034] like Figure 4As shown, the PCB board 120 has a positive electrode via 123, which corresponds to the positive electrode pad 122, indicating that the positive electrode is located within the range of the positive electrode pad 122 via 123. The positive electrode via 123 is used to guide the positive electrode signal of the piezoelectric ceramic sheet 130 to the positive electrode pad 122. Since the front side of the PCB board 120 is attached to the positive electrode surface of the piezoelectric ceramic sheet 130 with conductive adhesive, the positive electrode pad 122 of the PCB board 120 directly receives the positive electrode signal of the piezoelectric ceramic sheet 130 through the positive electrode via 123 on the positive electrode pad 122. In this way, without adding additional lines and / or components, the piezoelectric ceramic sheet 130 and the positive electrode pad 122 are electrically connected, simplifying the circuit structure of the ultrasonic water meter transducer, improving the space utilization and component integration rate of the ultrasonic water meter transducer, and reducing the size of the ultrasonic water meter transducer.

[0035] like Figure 4 As shown, the ultrasonic water meter transducer of this embodiment further includes a tinned copper wire 150, one end of which is disposed on the protrusion 131, and the other end is connected to the negative electrode pad 121 of the PCB board 120. In this way, the negative electrode surface of the piezoelectric ceramic sheet 130 is electrically connected to the negative electrode pad 121 of the PCB board 120 via the tinned copper wire 150, eliminating the need for additional wiring and / or components. This simplifies the wiring structure of the ultrasonic water meter transducer, allows for a more rational internal structure design, improves the space utilization and component integration rate of the ultrasonic water meter transducer, and reduces its size.

[0036] like Figure 5 As shown, the ultrasonic water meter transducer of this embodiment further includes a signal line 160. The first end of the signal line 160 is connected to the positive pad 121 and the negative pad 122 of the PCB board 120, respectively. Specifically, the signal line 160 is a two-core signal line, one core being the positive signal line and the other core being the negative signal line. The negative signal line at the first end of the signal line 160 is connected to the negative pad 121, and the positive signal line at the first end of the signal line 160 is connected to the positive pad 122. The second end of the signal line 160 is led out from the opening of the housing 110. The signal line 160 is used to connect to the PCB board 120 to lead out the positive and negative signals of the piezoelectric ceramic sheet 130. Figure 5 The signal line 160 shown is T-shaped, which simplifies the circuit structure of the signal line 160, makes the signal line 160 reasonably designed, improves the space utilization and component integration rate of the ultrasonic water meter transducer, and reduces the size of the ultrasonic water meter transducer.

[0037] like Figure 1 and Figure 2As shown, the ultrasonic water meter transducer of this embodiment further includes: a backing 170, which is correspondingly disposed to the opening of the housing 110, forming a closed cavity with the housing 110; the first ends of the PCB board 120, the piezoelectric ceramic sheet 130, the matching layer 140, and the signal line 160 are all disposed on the backing 170 and disposed in the cavity, and the second end of the signal line 160 is led out through the through hole of the backing 170. The material of the backing 170 includes, but is not limited to, tungsten powder-epoxy resin composite material. The main function of the backing 170 is to absorb the acoustic energy radiated into the probe by the piezoelectric element due to vibration, preventing the acoustic energy from being reflected back and transmitted to the piezoelectric element, causing interference. The backing 170 also has an acoustic impedance that matches the piezoelectric material and can significantly absorb unnecessary ultrasonic signals emitted by the piezoelectric ceramic sheet 130 to the back, attenuating them to a minimum.

[0038] In this embodiment, the material of the first matching layer 141 includes, but is not limited to, a composite material of epoxy resin and zirconium oxide. The material of the second matching layer 142 includes, but is not limited to, epoxy resin. The acoustic impedance range of the first matching layer 141 is 6.5-8 Mrayl, and the acoustic impedance range of the second matching layer 142 is 1.5-3 Mrayl. By setting these two matching layers, the bandwidth of the ultrasonic water meter transducer is increased, the range of ultrasonic signal frequencies that the ultrasonic water meter transducer can receive is expanded, and the performance of the ultrasonic water meter transducer is improved. Thus, the ultrasonic water meter transducer can ensure accurate and stable water measurement at different temperatures.

[0039] Example 2

[0040] Based on the same inventive concept, the second embodiment of this utility model also provides an ultrasonic water meter, including: an ultrasonic water meter transducer as described in embodiment one.

[0041] Those skilled in the art will understand that although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0042] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. An ultrasonic water meter transducer, characterized by, The application relates to an ultrasonic water meter transducer. The positive surface of the piezoelectric ceramic sheet is provided with the PCB, and the negative surface of the piezoelectric ceramic sheet is provided with the matching layer. The matching layer comprises a first matching layer and a second matching layer, the first matching layer is arranged on the negative surface of the piezoelectric ceramic sheet, and the second matching layer is arranged on the first matching layer. The piezoelectric ceramic sheet comprises a convex part welded on the negative surface of the piezoelectric ceramic sheet.

2. The ultrasonic water meter transducer of claim 1, wherein, The application further relates to an ultrasonic water meter transducer.

3. The ultrasonic water meter transducer of claim 2, wherein, The first matching layer comprises a concave part arranged in correspondence with the convex part. The PCB comprises a positive pad and a negative pad arranged on the back surface of the PCB, and the front surface of the PCB is attached to the positive surface of the piezoelectric ceramic sheet through conductive adhesive.

4. The ultrasonic water meter transducer of claim 2, wherein, The PCB is provided with a positive through hole arranged in correspondence with the positive pad, and the positive through hole is used for guiding the positive signal of the piezoelectric ceramic sheet to the positive pad.

5. The ultrasonic water meter transducer of claim 1, wherein, The application further relates to an ultrasonic water meter transducer.

6. The ultrasonic water meter transducer of claim 5, wherein, The signal line is provided with a first end connected to the positive pad and the negative pad of the PCB respectively and a second end drawn out of the opening of the shell.

7. The ultrasonic water meter transducer of claim 1, wherein, The application further relates to an ultrasonic water meter transducer. The back support is arranged in correspondence with the opening of the shell and forms a closed cavity with the shell.

8. The ultrasonic water meter transducer of claim 7, wherein, The PCB, the piezoelectric ceramic sheet, the matching layer and the first end of the signal line are arranged on the back support and in the cavity, and the second end of the signal line is drawn out through the through hole of the back support. The acoustic impedance of the first matching layer ranges from 6.5 to 8 Mrayl, and the acoustic impedance of the second matching layer ranges from 1.5 to 3 Mrayl. The application further relates to an ultrasonic water meter transducer.

9. The ultrasonic water meter transducer of claim 1, wherein, ​ 10. An ultrasonic water meter characterized by, ​ ​

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