Ultrasonic transducer
By designing the circuit layer in the ultrasonic transducer directly to the electrode signal, the problem of low measurement accuracy caused by steel shell interference is solved and the performance of the equipment is improved.
Patent Information
- Application Number
- CN202421103623.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-20
Smart Images
Figure CN222490867U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ultrasonic transducers, in particular to an ultrasonic transducer. Background Art
[0002] Ultrasonic transducers are devices that realize the mutual conversion between electrical energy and mechanical energy. Ultrasonic transducers are used as sensors in gas ultrasonic flow meters to measure the flow of gas. The principle of ultrasonic transducers is to use the time difference, phase difference or frequency difference of the sound wave signal generated by them in the measured pipeline to achieve accurate measurement of flow velocity and / or flow. Its main features are high measurement accuracy, wide measurement range, no flow resistance, small pressure loss, etc. Therefore, ultrasonic transducers have been widely used and promoted in recent years.
[0003] The ultrasonic transducer includes a piezoelectric body, on which two electrodes are arranged, serving as the positive and negative electrodes of the piezoelectric body respectively. In general, the positive electrode of the piezoelectric body is directly connected to the wire, and its positive electrode signal is directly output to the outside through the wire, while the negative electrode of the piezoelectric body is directly in contact with the steel shell and is attached to the steel shell, and its negative electrode signal is led outward by the steel shell. However, since the steel shell has a strong reflection effect on ultrasonic waves, it will cause certain interference to the sending and receiving of the transducer signal. This interference will have a great impact on the processing of the transducer signal and even the measurement of the gas, reducing the measurement accuracy of the ultrasonic transducer and affecting the performance of the transducer.
[0004] In the process of implementing the utility model, the applicant found that there are at least the following problems in the prior art:
[0005] The electrode signal of the existing ultrasonic transducer will be interfered by the steel shell, resulting in low measurement accuracy of the ultrasonic transducer and affecting the performance of the transducer. Utility Model Content
[0006] The purpose of the utility model is to provide an ultrasonic transducer to solve the technical problem in the prior art that the electrode signal of the ultrasonic transducer is interfered by the steel shell, resulting in low measurement accuracy of the ultrasonic transducer and affecting the performance of the transducer. The preferred technical solution among the many technical solutions provided by the utility model can produce many technical effects as described below.
[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0008] The utility model provides an ultrasonic transducer, comprising: a piezoelectric layer, a matching layer and a circuit layer;
[0009] The piezoelectric layer includes a piezoelectric wafer, a first electrode and a second electrode, wherein the first electrode and the second electrode are both arranged on one side of the piezoelectric wafer; the first electrode is located in the middle of the piezoelectric wafer, and the second electrode is located at the outer edge of the piezoelectric wafer;
[0010] The matching layer is arranged on the other side of the piezoelectric wafer;
[0011] The circuit layer is disposed on the first electrode and the second electrode and is electrically connected to the first electrode and the second electrode, and is used to lead signals of the first electrode and the second electrode outward.
[0012] Optionally, the circuit layer matches the size of the piezoelectric wafer;
[0013] The corners of the circuit layer are provided with windows, and the windows match the size and shape of the array elements on the corners of the second electrode;
[0014] The circuit layer is connected to the piezoelectric layer after being aligned through the empty window and the array elements at the corners of the second electrode.
[0015] Optionally, an inner ring pad and an outer ring pad are provided on the circuit layer;
[0016] The inner ring pad is connected to the first electrode, and the signal of the first electrode is led outward through a connecting line;
[0017] The outer ring pad is connected to the second electrode, and the signal of the second electrode is led outward through the connecting line.
[0018] Optionally, the circuit layer is connected to the piezoelectric layer via a first adhesive layer;
[0019] The circuit layer is a flexible circuit board.
[0020] Optionally, the size and shape of the matching layer match the size and shape of the piezoelectric layer.
[0021] Optionally, the matching layer is connected to the piezoelectric layer via a second adhesive layer.
[0022] Optionally, the transducer further includes a shell, and the piezoelectric layer, the matching layer and the circuit layer are all arranged in the shell.
[0023] Optionally, the shell includes a sleeve, which is sleeved on the outside of the piezoelectric layer, the matching layer and the circuit layer to surround the sides of the piezoelectric layer, the matching layer and the circuit layer.
[0024] Optionally, the housing further comprises an outer shell, the outer shell is a slot structure, and the sleeve can be fixed in the slot structure;
[0025] The groove wall of the groove structure matches the outer wall of the sleeve body.
[0026] Optionally, the depth of the groove structure is greater than the depth of the sleeve.
[0027] Implementing one of the above technical solutions of the utility model has the following advantages or beneficial effects:
[0028] The first electrode and the second electrode in the utility model are arranged on the same side, and the signals of the first electrode and the second electrode are directly led out through the circuit layer. The electrode signals will not be interfered by the steel shell, and the performance of the ultrasonic transducer can be improved while ensuring the measurement accuracy of the ultrasonic transducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:
[0030] Figure 1 It is a schematic diagram of the connection between the piezoelectric layer and the matching layer in the embodiment of the utility model;
[0031] Figure 2 It is a schematic diagram of the connection between the piezoelectric layer, the matching layer and the circuit layer in the embodiment of the utility model;
[0032] Figure 3 It is a schematic diagram of the overall structure of an embodiment of the utility model;
[0033] Figure 4 It is a schematic diagram of the overall structure disassembly of an embodiment of the utility model.
[0034] In the figure: 1. piezoelectric layer; 11. piezoelectric chip; 12. first electrode; 13. second electrode; 14. array element; 2. matching layer; 3. circuit layer; 31. empty window; 32. inner circle pad; 33. outer circle pad; 34. connecting wire; 4. shell; 41. sleeve; 42. outer shell; 43. slot structure; 5. backing layer. DETAILED DESCRIPTION
[0035] In order to make the purpose, technical solutions and advantages of the utility model clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, wherein various exemplary embodiments that may be used to implement the utility model are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods, and devices that are consistent with some aspects of the utility model disclosed as detailed in the attached claims, and other embodiments may also be used, or the embodiments listed herein may be modified in structure and function without departing from the scope and essence of the utility model.
[0036] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", etc. indicate the orientation or position relationship based on the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means two or more. The terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.
[0037] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below, in which only the parts related to the embodiment of the present invention are shown.
[0038] Example:
[0039] like Figure 1-2 As shown, the utility model provides an ultrasonic transducer, comprising: a piezoelectric layer 1, a matching layer 2 and a circuit layer 3; the piezoelectric layer 1 comprises a piezoelectric chip 11, a first electrode 12 and a second electrode 13, the first electrode 12 and the second electrode 13 are both arranged on one side of the piezoelectric chip 11; the first electrode 12 is located in the middle of the piezoelectric chip 11, and the second electrode 13 is located at the outer edge of the piezoelectric chip 11; the matching layer 2 is arranged on the other side of the piezoelectric chip 11; the circuit layer 3 is arranged on the first electrode 12 and the second electrode 13, and is electrically connected to the first electrode 12 and the second electrode 13, and is used to lead the signals of the first electrode 12 and the second electrode 13 outward.
[0040] Specifically, the first electrode 12 and the second electrode 13 are arranged on the same side of the piezoelectric wafer 11, but the first electrode 12 and the second electrode 13 are two separate parts on the piezoelectric wafer 11, the first electrode 12 is arranged in the middle of the piezoelectric wafer 11, and the second electrode 13 is arranged at the outer edge of the piezoelectric wafer 11. The projection area of the first electrode 12 and the second electrode 13 in the axial direction is the same as the projection area of the piezoelectric wafer 11 in the axial direction.
[0041] It should be noted that the first electrode 12 and the second electrode 13 are both chromium / gold electrodes. The chromium / gold electrode means that a layer of chromium electrode is first plated on the piezoelectric chip 11, and then a layer of gold electrode is plated, so that the gold electrode will not fall off, and the gold electrode will be more firmly on the piezoelectric chip 11. The gold electrode has the characteristics of anti-oxidation and anti-corrosion, and can maintain good performance even in harsh environments. In addition, the gold electrode also has good conductivity and stability, which can improve the stability and reliability of transducer detection.
[0042] like Figure 1 As shown, the matching layer 2 is arranged opposite to the first electrode 12 and the second electrode 13. The first electrode 12 and the second electrode 13 are arranged on one side of the piezoelectric chip 11, and the matching layer 2 is arranged on the other side of the piezoelectric chip 11. As a sound transmission layer, the matching layer 2 can transmit as much sound waves as possible to the outside, thereby improving the electrical and acoustic performances of the ultrasonic transducer.
[0043] On the same side of the first electrode 12 and the second electrode 13, a circuit layer 3 is also arranged above them. Figure 2 As shown. In addition to being structurally connected to the first electrode 12 and the second electrode 13, the circuit layer 3 is also electrically connected to the first electrode 12 and the second electrode 13. After being electrically connected to the first electrode 12 and the second electrode 13, the circuit layer 3 will lead the signals of the first electrode 12 and the second electrode 13 to the outside, so as to facilitate connection with other external control devices. It should be noted that the first electrode 12 is the positive electrode and the second electrode 13 is the negative electrode. In this embodiment, the circuit layer 3 can lead the positive and negative signals on the piezoelectric layer 1 to the outside. Unlike the prior art, the negative signal of the piezoelectric layer 1 will not be transmitted to the outside through the steel shell, and the output signal will not be interfered by the steel shell, which can ensure the measurement accuracy of the ultrasonic transducer and improve the performance of the ultrasonic transducer.
[0044] As an optional implementation, Figure 2 As shown, the size of the circuit layer 3 matches that of the piezoelectric chip 11; windows 31 are provided at the corners of the circuit layer 3, and the windows 31 match the size and shape of the array elements 14 at the corners of the second electrode 13; the circuit layer 3 is connected after being aligned with the piezoelectric layer 1 through the windows 31 and the array elements 14 at the corners of the second electrode 13.
[0045] Specifically, the size of the circuit layer 3 matches the size of the piezoelectric chip 11, and the circuit layer 3 can be accurately attached to the first electrode 12 and the second electrode 13 on the piezoelectric chip 11. In this embodiment, the shape of the circuit layer 3 and the piezoelectric chip 11 is preferably a square. The four corners of the circuit layer 3 are provided with windows 31, and the size of the windows 31 matches the size of the array element 14 on the corner of the second electrode 13. Before the circuit layer 3 and the piezoelectric layer 1 are connected, the circuit layer 3 and the piezoelectric layer 1 need to be aligned. When aligning, the windows 31 on the circuit layer 3 need to be aligned with the array element 14 on the corner of the first electrode 12, so that the alignment of the circuit layer 3 and the piezoelectric layer 1 can be ensured, which is convenient for connecting with the first electrode 12 and the second electrode 13.
[0046] It should be noted that the first electrode 12 and the second electrode 13 are actually a plurality of array elements on the piezoelectric wafer 11. Figure 1 As shown, assuming that the piezoelectric chip 11 is a 10×10 array, according to the above description, the first electrode 12 is a 9×9 array in the middle of the piezoelectric chip 11, and the second electrode 13 is a circle at the outermost edge of the piezoelectric chip 11.
[0047] As an optional embodiment, an inner circle pad 32 and an outer circle pad 33 are provided on the circuit layer 3; the inner circle pad 32 is connected to the first electrode 12, and the signal of the first electrode 12 is led outward through the connecting line 34; the outer circle pad 33 is connected to the second electrode 13, and the signal of the second electrode 13 is led outward through the connecting line 34.
[0048] Specifically, if Figure 2 As shown, the inner ring pad 32 and the outer ring pad 33 provided on the circuit layer 3 correspond to the positions of the first electrode 12 and the second electrode 13, respectively. After the circuit layer 3 is connected to the piezoelectric layer 1, the first pad is fixed above the first electrode 12, and the second pad is fixed above the second electrode 13, for obtaining the signals of the first electrode 12 and the second electrode 13. The inner ring pad 32 and the outer ring pad 33 are used to connect with the first electrode 12 and the second electrode 13 to obtain the electrode signals of the first electrode 12 and the second electrode 13, and are also connected to the external connection line 34 to output the obtained signals of the first electrode 12 and the second electrode 13 to the outside, so as to realize electrical connection with other external control devices.
[0049] It should be noted that the circuit layer 3 is connected to the piezoelectric layer 1 through the first adhesive layer, and the adhesive material used in the first adhesive layer is conductive adhesive or epoxy resin. In this embodiment, the adhesive material of the first adhesive layer is preferably conductive adhesive. The circuit layer 3 is a flexible circuit board.
[0050] As an optional embodiment, the matching layer 2 is connected to the piezoelectric layer 1 through a second adhesive layer. The adhesive material used in the second adhesive layer is organic silica gel or epoxy resin. In this embodiment, the adhesive material of the second adhesive layer is preferably epoxy resin. It should be noted that the size and shape of the matching layer 2 are the same as those of the piezoelectric layer 1.
[0051] As an optional implementation, Figure 3-4 As shown, the transducer further includes a housing 4, and the piezoelectric layer 1, the matching layer 2, and the circuit layer 3 are all arranged in the housing 4. The housing 4 includes a sleeve 41, which is sleeved on the outside of the piezoelectric layer 1, the matching layer 2, and the circuit layer 3, and is used to surround the sides of the piezoelectric layer 1, the matching layer 2, and the circuit layer 3. The housing 4 also includes an outer shell 42, and the outer shell 42 is a slot structure 43, and the sleeve 41 can be fixed in the slot structure 43; the slot wall of the slot structure 43 matches the outer wall of the sleeve 41.
[0052] Specifically, the housing 4 includes a sleeve 41 and an outer shell 42. After the circuit layer 3 and the matching layer 2 are connected to the piezoelectric layer 1, they need to be further assembled with the housing 4. In this embodiment, an opening is provided in the middle of the sleeve 41. The inner wall of the opening matches the size of the outer wall of the circuit layer 3, the piezoelectric layer 1 and the matching layer 2 after they are connected. The connected circuit layer 3, the piezoelectric layer 1 and the matching layer 2 can be sleeved with the sleeve 41 through the opening, and the height of the sleeve 41 is consistent with the height of the connected circuit layer 3, the piezoelectric layer 1 and the matching layer 2. The setting of the sleeve 41 can avoid filling glue between the housing 4 and the connected piezoelectric layer 1, the matching layer 2 and the circuit layer 3, while also achieving the function of supporting and protecting the internal components, and will not affect the correct transmission of the electrode signal. The sleeve 41 in this embodiment is a rubber sleeve.
[0053] The outer shell 42 can be sleeved with the sleeve 41. After the outer shell 42 and the sleeve 41 are sleeved, the inner bottom of the outer shell 42 will contact the bottom of the matching layer 2 and the bottom of the sleeve 41. The groove wall of the groove structure 43 in the outer shell 42 is the same size and shape as the outer wall of the sleeve 41, and the groove wall of the groove structure 43 will also contact the outer wall of the sleeve 41. The role of the outer shell 42 is to protect the piezoelectric layer 1, the matching layer 2 and the circuit layer 3 in the sleeve 41, and further play a supporting and protective role.
[0054] It should be noted that the depth of the groove structure 43 is greater than the depth of the casing 41. After the piezoelectric layer 1, the matching layer 2 and the circuit layer 3 are arranged in the casing 41 and assembled with the casing 42, the bottom of the matching layer 2 will contact the inner bottom of the casing 42, but the top of the circuit layer 3 is exposed. Therefore, in order to ensure the normal use of the ultrasonic transducer, a backing layer 5 needs to be arranged on the circuit layer 3, such as Figure 3-4Therefore, the depth of the groove in the housing 42 needs to be greater than the depth of the sleeve 41, so as to facilitate the arrangement of the backing layer 5 on the circuit layer 3. The backing layer 5 is used to absorb unnecessary clutter and increase the bandwidth of the transducer to improve the performance of the transducer.
[0055] It should also be noted that since the circuit layer 3 is connected with a connection line 34 for leading the electrode signal outward. Figure 3-4 As shown, when the backing layer 5 is disposed on the circuit layer 3 , the connecting wires 34 need to be led outward along the wall edge of the slot structure 43 .
[0056] The embodiment is only a special case and does not indicate that the present invention is implemented in such a way.
[0057] The above description is only the preferred embodiment of the present invention. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the guidance of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.
Claims
1. An ultrasonic transducer, characterized in that: include: A piezoelectric layer (1), a matching layer (2) and a circuit layer (3); The piezoelectric layer (1) comprises a piezoelectric chip (11), a first electrode (12) and a second electrode (13), wherein the first electrode (12) and the second electrode (13) are both arranged on one side of the piezoelectric chip (11); the first electrode (12) is located in the middle of the piezoelectric chip (11), and the second electrode (13) is located at the outer edge of the piezoelectric chip (11); The matching layer (2) is arranged on the other side of the piezoelectric wafer (11); The circuit layer (3) is arranged on the first electrode (12) and the second electrode (13), and is electrically connected to the first electrode (12) and the second electrode (13), and is used to lead the signals of the first electrode (12) and the second electrode (13) outwardly.
2. An ultrasonic transducer according to claim 1, characterized in that: The size of the circuit layer (3) matches that of the piezoelectric chip (11); The corners of the circuit layer (3) are provided with windows (31), and the size and shape of the windows (31) match those of the array elements (14) on the corners of the second electrode (13); The circuit layer (3) is connected to the piezoelectric layer (1) after being aligned through the empty window (31) and the array element (14) at the corner of the second electrode (13).
3. An ultrasonic transducer according to claim 1, characterized in that: An inner ring pad (32) and an outer ring pad (33) are provided on the circuit layer (3); The inner ring pad (32) is connected to the first electrode (12), and the signal of the first electrode (12) is led outward through a connecting line (34); The outer ring pad (33) is connected to the second electrode (13), and the signal of the second electrode (13) is led outward through the connecting line (34).
4. The ultrasonic transducer according to claim 1, characterized in that: The circuit layer (3) is connected to the piezoelectric layer (1) via a first adhesive layer; The circuit layer (3) is a flexible circuit board.
5. The ultrasonic transducer according to claim 1, characterized in that: The size and shape of the matching layer (2) match the size and shape of the piezoelectric layer (1).
6. The ultrasonic transducer according to claim 1, characterized in that: The matching layer (2) is connected to the piezoelectric layer (1) via a second adhesive layer.
7. The ultrasonic transducer according to claim 1, characterized in that: The transducer further comprises a housing (4), and the piezoelectric layer (1), the matching layer (2) and the circuit layer (3) are all arranged in the housing (4).
8. An ultrasonic transducer according to claim 7, characterized in that: The shell (4) comprises a sleeve (41), wherein the sleeve (41) is sleeved on the outside of the piezoelectric layer (1), the matching layer (2) and the circuit layer (3), and is used to surround the side edges of the piezoelectric layer (1), the matching layer (2) and the circuit layer (3).
9. An ultrasonic transducer according to claim 8, characterized in that: The housing (4) further comprises an outer shell (42), the outer shell (42) being a slot structure (43), and the sleeve (41) can be fixed in the slot structure (43); The groove wall of the groove structure (43) matches the outer wall of the sleeve (41).
10. An ultrasonic transducer according to claim 9, characterized in that: The depth of the groove structure (43) is greater than the depth of the sleeve (41).