Piezoelectric sensor

Abstract

A piezoelectric sensor provided by the present application comprises a fixed seat, a piezoelectric assembly, a pressure head, a conductive assembly and a coaxial radio frequency connector, the fixed seat is internally provided with a first installation space and a second installation space which are communicated with each other, the piezoelectric assembly is arranged in the first installation space, one end of the pressure head abuts against the piezoelectric assembly, the conductive assembly is arranged in the second installation space, and the coaxial radio frequency connector is arranged in the second installation space. One end of the coaxial radio frequency connector is electrically connected with the other end of the conductive assembly. The piezoelectric assembly comprises a plurality of piezoelectric elements and at least one electrode slice, the electrode slice is arranged between at least any two adjacent piezoelectric elements in the axial direction to form a laminated structure, and the polarities of the opposite side surfaces of the two adjacent piezoelectric elements are the same. According to the piezoelectric sensor provided by the invention, charges generated by the plurality of piezoelectric elements are accumulated together, so that the sensitivity of the piezoelectric sensor is improved, the use requirements of the piezoelectric sensor on high-precision measurement and small signal detection are met, and the probability that mechanical stress is concentrated on a single piezoelectric element can also be reduced.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a piezoelectric sensor. Background Art

[0002] Piezoelectric sensors are widely used in the measurement of physical quantities such as mechanical pressure, vibration, and acceleration. Piezoelectric sensors use the characteristic of piezoelectric elements to generate electric charges when subjected to force for measurement. They have high sensitivity, fast response speed, and simple structure. They are widely used in precision machinery, aerospace, engineering survey and other fields. The piezoelectric sensors in related technologies use a single piezoelectric element. On the one hand, the stability of a single piezoelectric element is poor. On the other hand, the sensitivity and performance of a single piezoelectric element are limited, and it may not be able to generate a strong enough electrical signal. The signal output intensity is low, and the ability to suppress external noise is large, making it difficult to meet the testing requirements of high-precision and small signal changes. Utility Model Content

[0003] In view of this, an embodiment of the present application hopes to provide a piezoelectric sensor, whose laminated structure makes the piezoelectric sensor highly stable, with sufficient sensitivity and signal-to-noise ratio, and can meet the testing requirements of high precision and small signal changes.

[0004] The present application provides a piezoelectric sensor, comprising:

[0005] A fixing seat, wherein the fixing seat has a first installation space and a second installation space that are interconnected;

[0006] A piezoelectric component is disposed in the first installation space;

[0007] A pressure head, one end of which abuts against the piezoelectric component, and the other end of which protrudes from a first end of the fixing seat along the axial direction;

[0008] A conductive component is disposed in the second installation space, and one end of the conductive component is electrically connected to the piezoelectric component;

[0009] A coaxial RF connector, one end of which is electrically connected to the other end of the conductive component, and the other end of which protrudes from the second end of the fixing base along the axial direction and is used to connect to an external device;

[0010] The piezoelectric assembly includes a plurality of piezoelectric elements and at least one electrode sheet. The electrode sheet is arranged between at least any two adjacent piezoelectric elements in the axial direction to form a stacked structure. The polarities of the surfaces on opposite sides of the two adjacent piezoelectric elements are the same.

[0011] In some embodiments, there are multiple electrode sheets, and the bottommost electrode sheet is disposed between the piezoelectric element and the pressure head; and / or the topmost electrode sheet is disposed between the piezoelectric element and the fixing seat.

[0012] In some embodiments, there are multiple electrode sheets; the number of the electrode sheets is consistent with the number of the piezoelectric elements; and / or the polarities of two adjacent electrode sheets are opposite.

[0013] In some embodiments, there are multiple electrode sheets, including multiple positive electrode sheets and multiple negative electrode sheets, at least any one of the piezoelectric elements is arranged between the positive electrode sheet and the negative electrode sheet, and the piezoelectric assembly includes a positive electrode connector and a negative electrode connector, the positive electrode connector connects the positive electrode sheets, the negative electrode connector connects the negative electrode sheets, and the positive electrode connector and the negative electrode connector are arranged at intervals on the outside of the piezoelectric element.

[0014] In some embodiments, the positive electrode connector is a cable; or, the positive electrode connector includes a positive electrode conductive column, the positive electrode sheet includes a positive electrode body and a positive electrode lug, the positive electrode body is used to abut and cooperate with the piezoelectric element, the positive electrode lug protrudes from the periphery of the positive electrode body and the piezoelectric element, and the positive electrode conductive column is penetrated through each of the positive electrode lugs.

[0015] In some embodiments, the negative electrode connector is a cable; or, the negative electrode connector includes a negative electrode conductive column, the negative electrode sheet includes a negative electrode body and a negative electrode lug, the negative electrode body is used to abut and cooperate with the piezoelectric element, the negative electrode lug protrudes from the periphery of the negative electrode body and the piezoelectric element, and the negative electrode conductive column is penetrated through each of the negative electrode lugs.

[0016] In some embodiments, the piezoelectric sensor includes an insulating ring, which is disposed in the first installation space and sleeved on the outside of the piezoelectric component to isolate the piezoelectric component from the fixing seat;

[0017] A notch is formed on the outer circumference of the insulating ring, and the notch is used to avoid the positive electrode connector and the negative electrode connector.

[0018] In some embodiments, the conductive component includes a conductive spring and a conductive push pin, one end of the conductive spring abuts the piezoelectric component, and the other end abuts the conductive push pin, and the conductive push pin maintains electrical connection with the coaxial RF connector under the elastic force of the conductive spring.

[0019] In some embodiments, the number of the electrode sheets is multiple, and the multiple electrode sheets include a positive electrode sheet and a negative electrode sheet, the bottom negative electrode sheet is arranged between the piezoelectric element and the pressure head, and the top piezoelectric element is arranged between the fixing seat and the positive electrode sheet located at the top;

[0020] The piezoelectric element has a hollow area, the pressure head is a metal part, and the conductive spring is inserted into the hollow area of ​​the uppermost piezoelectric element and abuts against the uppermost positive electrode sheet.

[0021] In some embodiments, the fixing seat is a metal part, and the piezoelectric sensor includes an insulating tube, which is arranged in the second installation space, and the insulating tube is sleeved on the outside of the conductive spring and the conductive push pin to isolate the conductive spring and the conductive push pin from the fixing seat.

[0022] The piezoelectric sensor provided in the embodiment of the present application has an electrode sheet arranged between at least any two adjacent piezoelectric elements, which can accumulate the charges generated by multiple piezoelectric elements, improve the sensitivity of the piezoelectric sensor, and facilitate meeting the use requirements of the piezoelectric sensor in high-precision measurement and small signal detection. In a noisy environment (such as industrial monitoring, mechanical equipment monitoring, etc.), the piezoelectric sensor can maintain a high signal-to-noise ratio when the signal is weak, and improve the accuracy of data acquisition. Of course, the setting of the laminated structure can also reduce the probability of mechanical stress concentration on a single piezoelectric element and increase the structural stability of the piezoelectric component. In addition, the cooperation of the fixed seat, the pressure head and the coaxial RF connector can also facilitate the improvement of the setting stability of the piezoelectric component and the conductive component, facilitate the transmission of pressure and the transmission of electrical signals, and the structural reliability of the piezoelectric sensor is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a piezoelectric sensor according to an embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure shown in another perspective;

[0025] Figure 3 for Figure 2 A cross-sectional view of the structure shown along the AA direction;

[0026] Figure 4 for Figure 1 An exploded schematic diagram of the structure shown, wherein the fixing seat is omitted in the illustration;

[0027] Figure 5 This is a schematic structural diagram of a piezoelectric component according to an embodiment of the present application;

[0028] Figure 6 for Figure 5 An exploded schematic diagram of the structure shown;

[0029] Figure 7 for Figure 5 Schematic diagram of the charge distribution of the structure shown.

[0030] Description of Reference Numerals

[0031] 100- piezoelectric sensor;

[0032] 10-fixed seat; 10a-first installation space; 10b-second installation space;

[0033] 11-piezoelectric component; 111-piezoelectric element; 111a-hollow area; 112-electrode sheet; 113-positive electrode sheet; 1131-positive electrode body; 1132-positive electrode lug; 114-negative electrode sheet; 1141-negative electrode body; 1142-negative electrode lug; 115-positive electrode connector; 116-negative electrode connector;

[0034] 12-pressing head; 13-conductive component; 131-conductive spring; 132-conductive ejector pin; 14-coaxial RF connector; 15-insulating ring; 15a-notch; 16-insulating tube. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application 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 application and are not used to limit the present application.

[0036] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0037] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the specific corresponding schematic diagrams, which may be the left and right directions in normal use or not.

[0038] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0039] The embodiment of the present application provides a piezoelectric sensor 100 .

[0040] The piezoelectric sensor 100 is a sensor that works by using the piezoelectric effect. The piezoelectric effect refers to the fact that in certain crystal or ceramic materials, when mechanical stress (such as pressure, tension, etc.) is applied, charge separation occurs inside these materials, thereby forming a voltage on the surface of the material. Conversely, when voltage is applied to these materials, they will also deform. This phenomenon is reversible.

[0041] The piezoelectric effect includes the direct piezoelectric effect and the inverse piezoelectric effect.

[0042] Direct piezoelectric effect: When a piezoelectric material is subjected to mechanical deformation (compression or stretching), it generates electric charges on its surface. If these charges are collected, an electrical signal proportional to the applied mechanical stress can be obtained.

[0043] Inverse piezoelectric effect: When a voltage is applied to a piezoelectric material, the material changes in size; when the voltage is removed, the dimensional change disappears.

[0044] In the embodiment of the present application, the piezoelectric sensor 100 using the positive piezoelectric effect is described as an example. The piezoelectric sensor 100 can be used for pressure measurement, acceleration measurement, vibration measurement, and sound wave detection.

[0045] See also Figures 1 to 7 The piezoelectric sensor 100 includes a fixing seat 10 , a piezoelectric component 11 , a pressure head 12 , a conductive component 13 and a coaxial radio frequency connector 14 .

[0046] The fixing base 10 has a first installation space 10a and a second installation space 10b which are connected to each other.

[0047] The piezoelectric component 11 is disposed in the first installation space 10a.

[0048] One end of the pressing head 12 abuts against the piezoelectric assembly 11 , and the other end protrudes from a first end of the fixing seat 10 along the axial direction.

[0049] The conductive component 13 is disposed in the second installation space 10 b , and one end of the conductive component 13 is electrically connected to the piezoelectric component 11 .

[0050] One end of the coaxial RF connector 14 is electrically connected to the other end of the conductive component 13 , and the other end protrudes from the second end of the fixing base 10 along the axial direction and is used to connect to an external device.

[0051] The fixing seat 10 can serve as a protective structure to provide mechanical support for the piezoelectric component 11, the conductive component 13, etc., and isolate the piezoelectric component 11 and the conductive component 13 from the external environment, thereby reducing the probability of the piezoelectric component 11 and the conductive component 13 being disturbed by the external environment and facilitating the stable operation of the piezoelectric component 11 and the conductive component 13.

[0052] It is understandable that the fixing base 10 can be used as a connecting component of the piezoelectric sensor 100 to achieve the connection between the piezoelectric sensor 100 and other structures, thereby achieving the installation of the piezoelectric sensor 100 and facilitating the piezoelectric sensor 100 to perform corresponding measurements. Exemplarily, at least part of the outer peripheral surface of the fixing base 10 can be formed with external threads, and the installation and fixation of the piezoelectric sensor 100 can be achieved by connecting the external threads with the internal threads on other structures. Of course, bonding, magnetic connection and other methods can also be used, which are not limited here.

[0053] The first installation space 10a is used to provide a housing space for the piezoelectric component 11, and the second installation space 10b is used to provide an installation space for the conductive component 13. The first installation space 10a and the second installation space 10b are interconnected, that is, they will not affect the electrical connection between the conductive component 13 and the piezoelectric component 11, thereby facilitating the transmission of electrical signals.

[0054] The first installation space 10a and the second installation space 10b may be sequentially distributed along the axial direction.

[0055] The pressure head 12 is the part that directly contacts the external environment or the object to be measured, and can evenly transmit the mechanical force (such as pressure, impact or vibration) applied from the outside to the internal piezoelectric component 11 .

[0056] The pressure head 12 can serve as the first contact point between the piezoelectric sensor 100 and the outside world, and together with the fixing base 10, the piezoelectric component 11 is isolated in the first installation space 10a, reducing the influence of dust, moisture, etc. on the sensitive piezoelectric component 11. The pressure head 12 can provide a stable and consistent contact surface to maintain the consistency and repeatability of the measurement. Of course, the pressure head 12 can be designed into various shapes and sizes according to different application requirements to adapt to different installation conditions and force modes.

[0057] One end of the pressure head 12 abuts against the piezoelectric component 11, and the other end protrudes from the first end of the fixing seat 10 in the axial direction. A portion of the pressure head 12 can extend into the first installation space 10a and abut against the piezoelectric component 11, so that the mechanical force can be evenly and stably transmitted to the piezoelectric component 11, and the installation position of the piezoelectric component 11 in the first installation space 10a is fixed. The other end of the pressure head 12 protrudes from the first end of the fixing seat 10 in the axial direction, that is, it can be used as a direct force-bearing part to bear force.

[0058] It is understandable that the pressure head 12 is connected to the fixing seat 10 to isolate the external influence and fix the position of the piezoelectric component 11. At the same time, it can also reduce the probability of relative displacement or loosening of the piezoelectric sensor 100 when subjected to external force, so as to maintain the consistency of the force transmission path, thereby improving the accuracy and repeatability of the measurement results.

[0059] The connection method between the pressure head 12 and the fixing seat 10 is not limited, and can be a detachable connection or a non-detachable connection. The detachable connection method can be a threaded connection, a slot or a slot connection. The non-detachable connection method can be bonding, etc.

[0060] Exemplarily, the pressing head 12 and the fixing seat 10 may be metal parts, have a certain structural strength, and are able to conduct electricity.

[0061] The coaxial RF connector 14 is an electrical connector for transmitting high-frequency signals and can be connected to an external device to transmit the electrical signal from the piezoelectric component 11 transmitted via the conductive component 13 to the external device, thereby facilitating analysis of the electrical signal.

[0062] Exemplarily, the coaxial RF connector 14 may include a center conductor, an outer conductor, and an insulating layer therebetween, so as to reduce electromagnetic interference and maintain signal integrity.

[0063] One end of the coaxial RF connector 14 is electrically connected to the other end of the conductive component 13, and the other end protrudes from the second end of the fixing base 10 along the axial direction. One end of the coaxial RF connector 14 can extend into the second installation space 10b and be electrically connected to the conductive component 13 so as to stably receive electrical signals, and the other end of the coaxial RF connector 14 can be connected to an external cable to connect to an external device. The external device can be an external electronic device or a measuring instrument.

[0064] It is understandable that the coaxial RF connector 14 is connected to the fixing base 10 to isolate the external influence and fix the position of the conductive component 13 and the piezoelectric component 11. At the same time, it can also reduce the probability of relative displacement or loosening of the piezoelectric sensor 100 when subjected to external force, so as to maintain the consistency of the force transmission path, thereby improving the accuracy and repeatability of the measurement results.

[0065] The coaxial RF connector 14 and the pressure head 12 are located at opposite ends of the fixing base 10 along the axial direction, and can stably transmit electrical signals and mechanical forces respectively without interfering with each other, and have high working stability.

[0066] The piezoelectric assembly 11 includes a plurality of piezoelectric elements 111 and at least one electrode sheet 112. An electrode sheet 112 is disposed between at least any two adjacent piezoelectric elements 111 in the axial direction to form a stacked structure. The polarities of the surfaces of the opposite sides of the two adjacent piezoelectric elements 111 are the same.

[0067] The plurality of piezoelectric elements 111 may be two, three or more, which is not limited here.

[0068] The number of the electrode sheets 112 is at least one, that is, the number of the electrode sheets 112 can be one, two, or more than two.

[0069] The piezoelectric element 111 is a structure for sensing mechanical stress and generating electric charge. The electrode sheet 112 is used to collect the electric charge generated by the piezoelectric element 111 and provide an electrical connection path.

[0070] Exemplarily, the electrode sheet 112 may be a metal sheet.

[0071] An electrode sheet 112 is arranged between at least any two adjacent piezoelectric elements 111. The electrode sheet 112 may be arranged only between any two adjacent piezoelectric elements 111, or a part of the electrode sheet 112 may be arranged between any two adjacent piezoelectric elements 111, and there is another electrode sheet 112 arranged above the topmost piezoelectric element 111 and / or there is another electrode sheet 112 arranged below the bottommost piezoelectric element 111.

[0072] In the present application, the direction close to the first end along the axial direction is considered as the lower side, and the direction close to the second end along the axial direction is considered as the upper side.

[0073] Each piezoelectric element 111 will produce charge separation on its surface when subjected to mechanical stress. The electrode sheet 112 is at least arranged between any adjacent piezoelectric elements 111, so that the charge can be effectively collected. At the same time, the electrode sheet 112 can act as a conductor to establish an electrical connection between the piezoelectric elements 111, so that the charge generated by each piezoelectric element 111 can be transferred to the conductive component 13 through the electrode sheet 112, forming a complete circuit path. The surfaces of the opposite sides of two adjacent piezoelectric elements 111 have the same polarity. When they are subjected to the same mechanical stress, charge separation in the same direction will occur. The electrode sheet 112 allows the charges in the same direction to be accumulated in the circuit instead of canceling each other out. In this way, the charges generated by multiple piezoelectric elements 111 are accumulated together, which can significantly improve the sensitivity of the piezoelectric sensor 100 and make it more sensitive to small changes.

[0074] The specific structure of the piezoelectric element 111 is not limited. For example, the piezoelectric element 111 may be a quartz plate, a piezoelectric ceramic, or the like.

[0075] The piezoelectric sensor 100 provided in the embodiment of the present application has an electrode sheet 112 disposed between at least any two adjacent piezoelectric elements 111, which can accumulate the charges generated by the multiple piezoelectric elements 111, improve the sensitivity of the piezoelectric sensor 100, and facilitate meeting the use requirements of the piezoelectric sensor 100 in high-precision measurement and small signal detection. In a noisy environment (such as industrial monitoring, mechanical equipment monitoring, etc.), the piezoelectric sensor 100 can maintain a high signal-to-noise ratio when the signal is weak, thereby improving the accuracy of data acquisition. Of course, the setting of the laminated structure can also reduce the probability of mechanical stress concentrating on a single piezoelectric element 111 and increase the structural stability of the piezoelectric assembly 11. In addition, the cooperation of the fixing seat 10, the pressure head 12 and the coaxial RF connector 14 can also facilitate the improvement of the setting stability of the piezoelectric assembly 11 and the conductive assembly 13, facilitate the transmission of pressure and the transmission of electrical signals, and the structural reliability of the piezoelectric sensor 100 is high.

[0076] It can be understood that the signal-to-noise ratio refers to the ratio of the strength of the received useful signal to the strength of the received interference signal. When the signal output strength is low, the ability to suppress external noise (such as external electromagnetic interference, mechanical vibration, temperature fluctuation, etc.) is poor, and the signal may be masked by background noise or interference, resulting in a low signal-to-noise ratio.

[0077] The number of the electrode sheets 112 and the number of the piezoelectric elements 111 may be the same or different.

[0078] Exemplarily, when the number of piezoelectric elements 111 is two, the number of electrode sheets 112 can be one, that is, it is arranged between the two piezoelectric elements 111; the number of electrode sheets 112 can also be two, that is, one is arranged between the two piezoelectric elements 111, and the other is arranged below the piezoelectric element 111 of the lower layer, or is arranged above the piezoelectric element 111 of the upper layer; of course, the number of electrode sheets 112 can also be three, one is arranged between the two piezoelectric elements 111, another is arranged below the piezoelectric element 111 of the lower layer, and the other is arranged above the piezoelectric element 111 of the upper layer.

[0079] In some embodiments, there are multiple electrode sheets 112 , and the bottom electrode sheet 112 is disposed between the piezoelectric element 111 and the pressure head 12 ; and / or the top electrode sheet 112 is disposed between the piezoelectric element 111 and the fixing seat 10 .

[0080] The provision of multiple electrode sheets 112 can facilitate each piezoelectric element 111 to respond to pressure changes independently, and improve the charge collection speed, thereby improving the overall sensitivity and response speed of the piezoelectric sensor 100.

[0081] Here, there are many situations.

[0082] First: Please refer to Figures 4 to 7 , the bottom electrode sheet 112 is arranged between the piezoelectric element 111 and the pressure head 12, and the top electrode sheet 112 is arranged between the two piezoelectric elements 111. That is to say, the bottom electrode sheet 112 is in contact with the pressure head 12, and the mechanical force transmitted by the pressure head 12 is transmitted to the piezoelectric element 111 through the electrode sheet 112. On the one hand, it is convenient for the effective transmission of mechanical stress. On the other hand, the bottom electrode sheet 112 can also be used as a positive electrode or a negative electrode to facilitate the outflow of positive or negative charges. Exemplarily, when it is necessary to output a positive charge signal, the positive charge can flow out through the conductive component 13, and the bottom electrode sheet 112 can form a negative electrode by abutting against the pressure head 12, thereby forming a loop, which is convenient for the stable transmission of electrical signals.

[0083] The second type: the bottom electrode sheet 112 is arranged between the piezoelectric element 111 and the pressure head 12, and the top electrode sheet 112 is arranged between the piezoelectric element 111 and the fixing seat 10. In this case, the top electrode sheet 112 and the bottom electrode sheet 112 can determine the position of the piezoelectric element 111, and isolate the piezoelectric element 111 and the electrode sheet 112, thereby reducing the probability of damage to the piezoelectric element 111 and reducing the influence of external electromagnetic interference. Of course, the arrangement of the top electrode sheet 112 and the bottom electrode sheet 112 can also act as a positive electrode or a negative electrode or be connected to the conductive component 13, so as to realize the stable transmission of electrical signals.

[0084] The third type: the bottom electrode sheet 112 is disposed between the two piezoelectric elements 111, and the top electrode sheet 112 is disposed between the piezoelectric element 111 and the fixing seat 10. In this case, the piezoelectric element 111 can directly receive the mechanical stress transmitted from the pressure head 12, and the arrangement of the top electrode sheet 112 does not require the structure of the piezoelectric element 111 to be changed, that is, the conductive component 13 can be directly connected to the electrode sheet 112, thereby transmitting electrical signals.

[0085] For some examples, see Figures 4 to 7 The number of the electrode sheets 112 is consistent with the number of the piezoelectric elements 111. That is, one electrode sheet 112 is located between the pressure head 12 and the piezoelectric element 111, or one electrode sheet 112 is located between the fixing seat 10 and the piezoelectric element 111.

[0086] In this way, an effective circuit closed loop can be realized, which facilitates the transmission of electrical signals, and at the same time, increases the speed of collecting charges and improves the sensitivity of the piezoelectric sensor 100 .

[0087] Exemplarily, there is an electrode sheet 112 located between the pressure head 12 and the bottom piezoelectric element 111, and the top piezoelectric element 111 abuts against the fixing seat 10. The fixing seat 10 and the pressure head 12 are metal parts. In this way, the electrode sheet 112 can be used as a positive electrode or a negative electrode, and a closed loop can be formed between the electrode sheet 112, the pressure head 12, the fixing seat 10, and the top piezoelectric element 111, so as to facilitate the effective transmission of electrical signals through the conductive component 13.

[0088] For some examples, see Figures 4 to 7 , the polarities of two adjacent electrode sheets 112 are opposite. In this way, it is convenient to collect positive charges and negative charges separately, so that positive charges are superimposed and negative charges are superimposed instead of canceling each other, thereby improving the signal output strength. Of course, it is also possible to reduce signal interference between the piezoelectric elements 111.

[0089] For some examples, see Figures 4 to 7 The multiple electrode sheets 112 include multiple positive sheets 113 and multiple negative sheets 114. At least any one of the piezoelectric elements 111 is arranged between the positive sheet 113 and the negative sheet 114. The piezoelectric component 11 includes a positive connector 115 and a negative connector 116. The positive connector 115 connects the positive sheets 113, and the negative connector 116 connects the negative sheets 114. The positive connector 115 and the negative connector 116 are arranged at intervals on the outside of the piezoelectric element 111.

[0090] It can be understood that the positive electrode sheet 113 is used to collect positive charges, and the negative electrode sheet 114 is used to collect negative charges.

[0091] In this embodiment, the setting of the positive electrode connector 115 can connect the positive electrode sheets 113 so that the positive electrode sheets 113 are connected in parallel, and the setting of the negative electrode connector 116 can connect the negative electrode sheets 114 so that the negative electrode sheets 114 are connected in parallel, so that the positive charge and negative charge of each piezoelectric element 111 can be superimposed through the positive electrode connector 115 and the negative electrode connector 116 respectively, so as to be effectively transmitted to the coaxial RF connector 14, thereby improving the signal output strength of the piezoelectric sensor 100.

[0092] The positive electrode connector 115 and the negative electrode connector 116 are arranged at intervals on the outside of the piezoelectric element 111, which can avoid affecting the contact between the positive electrode sheet 113, the negative electrode sheet 114 and the piezoelectric element 111, facilitate stable charge collection, and increase layout reliability.

[0093] For example, see Figure 6The number of positive electrode sheets 113 and negative electrode sheets 114 is three respectively, the number of piezoelectric elements 111 is six, and the number of piezoelectric elements 111 is consistent with the number of electrode sheets 112.

[0094] The specific structure of the positive electrode connector 115 is not limited.

[0095] In some embodiments, the positive connector 115 is a cable.

[0096] That is to say, the positive electrode sheets 113 are connected by cables, the structure is simple, and the volume occupied by the cables is small. In this embodiment, the positive electrode connector 115 and the positive electrode sheet 113 are a split structure.

[0097] In some other embodiments, please refer to Figures 4 to 7 The positive electrode connector 115 includes a positive electrode conductive column, and the positive electrode sheet 113 includes a positive electrode body 1131 and a positive electrode lug 1132. The positive electrode body 1131 is used to abut and cooperate with the piezoelectric element 111. The positive electrode lug 1132 protrudes from the outer periphery of the positive electrode body 1131 and the piezoelectric element 111, and the positive electrode conductive column is penetrated through each positive electrode lug 1132.

[0098] In this embodiment, the setting of the positive conductive column can connect the positive electrode sheets 113 without setting cables, reducing the probability of winding, making the overall structure of the piezoelectric sensor 100 simpler. At the same time, the positive conductive column can also connect the positive electrode sheets 113 into a whole, increasing the structural strength of the whole.

[0099] The arrangement of the positive electrode body 1131 and the positive electrode lug 1132 can facilitate the connection of the positive electrode conductive column to each positive electrode sheet 113 without affecting the close fit with the piezoelectric element 111 , and the connection reliability is high.

[0100] In this embodiment, the positive electrode connector 115 and the positive electrode sheet 113 may be a separate structure or an integrated structure, which is not limited here.

[0101] The specific structure of the negative electrode connector 116 is not limited.

[0102] In some embodiments, the negative electrode connector 116 is a cable.

[0103] That is to say, the negative electrode sheets 114 are connected by cables, which has a simple structure and a small volume occupied by the cables. In this embodiment, the negative electrode connector 116 and the negative electrode sheet 114 are a split structure.

[0104] In some other embodiments, please refer to Figures 4 to 7The negative electrode connector 116 includes a negative electrode conductive column, and the negative electrode sheet 114 includes a negative electrode body 1141 and a negative electrode lug 1142. The negative electrode body 1141 is used to abut and cooperate with the piezoelectric element 111. The negative electrode lug 1142 protrudes from the outer periphery of the negative electrode body 1141 and the piezoelectric element 111, and the negative electrode conductive column is penetrated through each negative electrode lug 1142.

[0105] In this embodiment, the negative conductive column can connect the negative electrode sheets 114 without the need for cables, thereby reducing the chance of winding and making the overall structure of the piezoelectric sensor 100 simpler. At the same time, the negative conductive column can also connect the negative electrode sheets 114 into a whole, thereby increasing the structural strength of the whole.

[0106] The arrangement of the negative electrode body 1141 and the negative electrode lug 1142 can facilitate the connection of the negative electrode conductive column to each negative electrode sheet 114 without affecting the close fit with the piezoelectric element 111 , and the connection reliability is high.

[0107] In this embodiment, the negative electrode connector 116 and the negative electrode sheet 114 may be a separate structure or an integrated structure, which is not limited here.

[0108] For some examples, see Figure 3 and Figure 4 The piezoelectric sensor 100 includes an insulating ring 15 , which is disposed in the first installation space 10 a . The insulating ring 15 is sleeved on the outside of the piezoelectric component 11 to isolate the piezoelectric component 11 from the fixing seat 10 .

[0109] In this embodiment, the provision of the insulating ring 15 can isolate the piezoelectric component 11 from the fixing seat 10 while positioning and fixing the piezoelectric component 11, thereby reducing the probability of short circuit between positive and negative charges.

[0110] See also Figure 3 and Figure 4 A notch 15 a is formed on the outer periphery of the insulating ring 15 , and the notch 15 a is used to avoid the positive electrode connector 115 and the negative electrode connector 116 .

[0111] In this embodiment, the notch 15 a can avoid the positive electrode connector 115 and the negative electrode connector 116 disposed outside the piezoelectric component 11 , thereby reducing the probability of interference and increasing the reliability of the piezoelectric component 11 .

[0112] The specific structure of the conductive component 13 is not limited.

[0113] For some examples, see Figure 3 and Figure 4The conductive component 13 includes a conductive spring 131 and a conductive top pin 132 . One end of the conductive spring 131 abuts against the piezoelectric component 11 , and the other end abuts against the conductive top pin 132 . The conductive top pin 132 maintains electrical connection with the coaxial RF connector 14 under the elastic force of the conductive spring 131 .

[0114] In this embodiment, the configuration of the conductive spring 131 can realize the electrical connection between the piezoelectric component 11 and the conductive top pin 132, thereby realizing the electrical connection between the piezoelectric component 11 and the coaxial RF connector 14, and can also rely on its own elastic deformation energy to compensate for assembly tolerances, so that under the action of the conductive spring 131, the conductive spring 131 is always in contact with the piezoelectric component 11 and the conductive top pin 132, and the conductive top pin 132 can also maintain the electrical connection with the coaxial RF connector 14. Of course, the conductive spring 131 can also provide positioning support for the conductive top pin 132, and has little effect on the load of the coaxial RF connector 14.

[0115] Furthermore, the conductive spring 131 and the conductive ejector pin 132 are provided as a bridge to connect the piezoelectric component 11 and the coaxial RF connector 14 , and no wiring is required, so the assembly difficulty is low.

[0116] For some examples, see Figures 3 to 7 The plurality of electrode sheets 112 include a positive electrode sheet 113 and a negative electrode sheet 114 , the bottom negative electrode sheet 114 is disposed between the piezoelectric element 111 and the pressure head 12 , and the top piezoelectric element 111 is disposed between the fixing seat 10 and the positive electrode sheet 113 located at the top.

[0117] The piezoelectric element 111 has a hollow area 111 a . The pressure head 12 is a metal member. The conductive spring 131 penetrates the hollow area 111 a of the uppermost piezoelectric element 111 and abuts against the uppermost positive electrode sheet 113 .

[0118] The hollow area 111a can facilitate the uppermost positive electrode sheet 113 to be exposed through the hollow area 111a of the uppermost piezoelectric element 111, so that the conductive spring 131 can pass through and abut against the uppermost positive electrode sheet 113, thereby outputting positive charges.

[0119] In this embodiment, the piezoelectric sensor 100 outputs positive charges to achieve electrical signal transmission through the conductive spring 131. The bottom negative electrode sheet 114 abuts against the pressure head 12, which can serve as a negative electrode, thereby achieving reliable electrical signal transmission.

[0120] The shape of the piezoelectric element 111 is not limited. The outer contour of the piezoelectric element 111 can be circular, square, polygonal or other irregular shapes. The hollow area 111a penetrates the piezoelectric element 111 axially. The shape of the hollow area 111a can be the same as the outer contour of the piezoelectric element 111 or different, and there is no limitation here.

[0121] For some examples, see Figure 3 and Figure 4 The fixing seat 10 is a metal part, and the piezoelectric sensor 100 includes an insulating tube 16, which is arranged in the second installation space 10b. The insulating tube 16 is sleeved on the outside of the conductive spring 131 and the conductive top pin 132 to isolate the conductive spring 131 and the conductive top pin 132 from the fixing seat 10.

[0122] It is understandable that negative charge can be transmitted through the bottom negative electrode sheet 114 to the fixing base 10 via the pressure head 12, and then transmitted from the fixing base 10 to the top piezoelectric element 111. The upper surface of the top piezoelectric element 111 is negatively charged, thus forming a circuit.

[0123] The positive charge is transmitted to the coaxial RF connector 14 through the uppermost positive electrode sheet 113 via the conductive spring 131 and the conductive top pin 132 .

[0124] Thus, in this embodiment, the provision of the insulating tube 16 can isolate the conductive spring 131 and the conductive ejector pin 132 from the fixing seat 10, thereby reducing the probability of short circuit between positive and negative charges and increasing the reliability of electrical signal transmission.

[0125] The pressing head 12 and the fixing seat 10 can be made of copper and copper alloys, iron and iron alloys, aluminum and aluminum alloys, etc.

[0126] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0127] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A piezoelectric sensor, characterized in that: include: A fixing seat, wherein the fixing seat has a first installation space and a second installation space that are interconnected; A piezoelectric component is disposed in the first installation space; A pressure head, one end of which abuts against the piezoelectric component, and the other end of which protrudes from a first end of the fixing seat along the axial direction; A conductive component is disposed in the second installation space, and one end of the conductive component is electrically connected to the piezoelectric component; A coaxial RF connector, one end of which is electrically connected to the other end of the conductive component, and the other end of which protrudes from the second end of the fixing base along the axial direction and is used to connect to an external device; The piezoelectric assembly includes a plurality of piezoelectric elements and at least one electrode sheet. The electrode sheet is arranged between at least any two adjacent piezoelectric elements in the axial direction to form a stacked structure. The polarities of the surfaces on opposite sides of the two adjacent piezoelectric elements are the same.

2. The piezoelectric sensor according to claim 1, characterized in that There are multiple electrode sheets; the electrode sheet at the bottom layer is arranged between the piezoelectric element and the pressure head; and / or the electrode sheet at the top layer is arranged between the piezoelectric element and the fixing seat.

3. The piezoelectric sensor according to claim 1, characterized in that: There are multiple electrode sheets; the number of the electrode sheets is consistent with the number of the piezoelectric elements; and / or the polarities of two adjacent electrode sheets are opposite.

4. The piezoelectric sensor according to claim 1, characterized in that: There are multiple electrode sheets, including multiple positive electrode sheets and multiple negative electrode sheets. At least any one of the piezoelectric elements is arranged between the positive electrode sheet and the negative electrode sheet. The piezoelectric assembly includes a positive electrode connector and a negative electrode connector. The positive electrode connector connects the positive electrode sheets, and the negative electrode connector connects the negative electrode sheets. The positive electrode connector and the negative electrode connector are arranged at intervals on the outside of the piezoelectric element.

5. The piezoelectric sensor according to claim 4, characterized in that: The positive electrode connector is a cable; or, the positive electrode connector includes a positive electrode conductive column, the positive electrode sheet includes a positive electrode body and a positive electrode lug, the positive electrode body is used to abut and cooperate with the piezoelectric element, the positive electrode lug protrudes from the outer periphery of the positive electrode body and the piezoelectric element, and the positive electrode conductive column is penetrated through each of the positive electrode lugs.

6. The piezoelectric sensor according to claim 4, characterized in that: The negative electrode connector is a cable; or, the negative electrode connector includes a negative electrode conductive column, the negative electrode sheet includes a negative electrode body and a negative electrode lug, the negative electrode body is used to abut and cooperate with the piezoelectric element, the negative electrode lug protrudes from the outer periphery of the negative electrode body and the piezoelectric element, and the negative electrode conductive column is penetrated through each of the negative electrode lugs.

7. The piezoelectric sensor according to claim 4, characterized in that: The piezoelectric sensor comprises an insulating ring, which is arranged in the first installation space and sleeved on the outside of the piezoelectric component to isolate the piezoelectric component from the fixing seat; A notch is formed on the outer circumference of the insulating ring, and the notch is used to avoid the positive electrode connector and the negative electrode connector.

8. The piezoelectric sensor according to claim 1, characterized in that: The conductive component includes a conductive spring and a conductive push pin. One end of the conductive spring abuts against the piezoelectric component, and the other end abuts against the conductive push pin. The conductive push pin maintains electrical connection with the coaxial RF connector under the elastic force of the conductive spring.

9. The piezoelectric sensor according to claim 8, characterized in that: The number of the electrode sheets is multiple, and the multiple electrode sheets include positive electrode sheets and negative electrode sheets, the negative electrode sheet at the bottom is arranged between the piezoelectric element and the pressure head, and the piezoelectric element at the top is arranged between the fixing seat and the positive electrode sheet at the top; The piezoelectric element has a hollow area, the pressure head is a metal part, and the conductive spring is inserted into the hollow area of ​​the uppermost piezoelectric element and abuts against the uppermost positive electrode sheet.

10. The piezoelectric sensor according to claim 9, characterized in that: The fixing seat is a metal part, and the piezoelectric sensor includes an insulating tube, which is arranged in the second installation space. The insulating tube is sleeved on the outside of the conductive spring and the conductive push pin to isolate the conductive spring and the conductive push pin from the fixing seat.

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