Internal elastic contact type piezoelectric sensor

Abstract

The invention provides an internal elastic contact type piezoelectric sensor, which comprises a coaxial radio frequency connector, a fixed base, a conductive lifting pin, a conductive spring, a piezoelectric material and a pressure head, and is characterized in that the coaxial radio frequency connector is mounted at the bottom of the fixed base, the conductive lifting pin and the conductive spring are fixed in the fixed base, and the piezoelectric material is fixed in the fixed base; one end of the conductive lifting pin is connected to the coaxial radio frequency connector, the other end of the conductive lifting pin is in contact with the piezoelectric material through a conductive spring, the conductive spring is wound at one end, close to the piezoelectric material, of the conductive lifting pin, and the pressure head is mounted at the top of the fixed base and is in contact with the piezoelectric material. According to the invention, the problems of charge collection and conduction can be effectively solved, and the performance and reliability of the internal elastic contact type piezoelectric sensor can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to an internal elastic contact type piezoelectric sensor. Background Art

[0002] Existing piezoelectric sensors usually collect charges through electrodes and conduct output. In this process, wires are the key conducting medium. Usually, the insulation layer is removed from both ends of the wires and soldered to the electrode ends and RF connectors respectively. Subsequently, the wires conduct the charges to external electronic devices or measuring instruments.

[0003] However, this traditional connection method has many problems, especially when making wire connections in a small space. First of all, it is very difficult to use a soldering iron to perform soldering operations in a small space, which can easily lead to soldering quality problems. In addition, RF connectors are large in size and are often not suitable for applications with limited space. Secondly, during the production and assembly process, the wires are easily pulled, which may cause the wires to break or the outer skin to break, resulting in poor insulation. The breakage and poor insulation of the wires not only affect the performance of the sensor, but may also cause safety hazards. In addition, welding fine wires requires professional operating skills, and it is difficult for ordinary workers to complete high-quality welding operations without professional training. This not only increases production costs, but also reduces production efficiency.

[0004] Therefore, it is necessary to improve the prior art. Summary of the invention

[0005] Existing piezoelectric sensors have problems such as space limitation, easy pulling of wires and complex operation. Therefore, the present invention provides an internal elastic contact piezoelectric sensor to solve the above problems.

[0006] The present invention provides an internal elastic contact piezoelectric sensor, which includes a coaxial radio frequency connector, a fixed base, a conductive top pin, a conductive spring, a piezoelectric material and a pressure head. The coaxial radio frequency connector is installed at the bottom of the fixed base, the conductive top pin and the conductive spring are fixed inside the fixed base, one end of the conductive top pin is connected to the coaxial radio frequency connector, and the other end is in contact with the piezoelectric material through the conductive spring, the conductive spring is wound around one end of the conductive top pin close to the piezoelectric material, and the pressure head is installed on the top of the fixed base and in contact with the piezoelectric material.

[0007] In one implementation, a hole is provided inside the fixed base, the hole is used to accommodate the conductive ejector pin and the conductive spring, and a notch is provided at the bottom of the fixed base, the notch is used to accommodate and fix the conductive ejector pin.

[0008] In one implementation, the piezoelectric material includes a quartz sheet and an electrode sheet, and two quartz sheets are attached to two sides of the electrode sheet.

[0009] In one implementation, the internal elastic contact piezoelectric sensor further includes an insulating ring, which surrounds the edges of the quartz plate and the electrode plate.

[0010] In one implementation, the end of the pressure head that contacts the fixed base is a step-protrusion structure, the outer diameter of the step-protrusion structure is the same as the outer diameter of the piezoelectric material, and the insulating ring simultaneously wraps the piezoelectric material and the step-protrusion structure.

[0011] In one implementation, the end of the pressure head that contacts the fixed base is a stepped shaft structure, a receiving groove is set on the top of the fixed base, the stepped shaft structure includes a first step and a second step connected in sequence, the outer diameter of the first step is the same as the outer diameter of the piezoelectric material, the insulating ring simultaneously wraps the piezoelectric material and the first step, and the outer diameter of the second step is smaller than the inner diameter of the receiving groove.

[0012] In one implementation, the top of the fixed base is connected to the pressure head via threads or snaps to form a sealing structure.

[0013] In one implementation, the internal elastic contact piezoelectric sensor further includes an insulating tube, which is disposed inside the fixed base and is used to wrap the conductive spring and the conductive ejector pin.

[0014] Beneficial effects: The present invention avoids the complicated process of traditional wire welding by adopting an elastic contact structure inside the sensor, and provides a combination of a conductive ejector pin and a conductive spring, which can ensure stable electrical contact between the electrode sheet inside the sensor and the coaxial RF connector under different mechanical pressures; the elastic contact reduces welding points and improves connection stability; the reasonable accommodation of the conductive ejector pin and the conductive spring not only saves space, but also simplifies the structural design, is suitable for applications in narrow spaces, is easy to assemble and disassemble, and is convenient for maintenance; the present invention can not only effectively solve the problem of charge collection and conduction, but also improve the performance and reliability of internal elastic contact piezoelectric sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the internal elastic contact piezoelectric sensor provided by the present invention; Figure 2 yes Figure 1 The exploded structural diagram of the internal elastic contact piezoelectric sensor shown; Figure 3 yes Figure 1A schematic diagram of the front exploded structure of the internal elastic contact piezoelectric sensor shown; Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure of the internal elastic contact piezoelectric sensor shown.

[0016] The numbers in the figure are as follows: 10. Coaxial RF connector; 20. Fixed base; 21. Notch; 22. Receiving groove; 30. Conductive top pin; 40. Conductive spring; 50. Piezoelectric material; 51. Quartz plate; 52. Electrode plate; 60. Press head; 61. First step; 62. Second step; 70. Insulating ring; 80. Insulating tube.

[0017] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0018] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. It will be understood by those skilled in the art that, unless specifically stated, the singular forms "one", "said", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used here may include wireless connection or wireless coupling. The term "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0019] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0020] Combined with reference Figure 1-Figure 4 , Figure 1 is a schematic diagram of the overall structure of the internal elastic contact piezoelectric sensor provided by the present invention, Figure 2 yes Figure 1The exploded structural diagram of the internal elastic contact piezoelectric sensor is shown in FIG. Figure 3 yes Figure 1 The front exploded structure diagram of the internal elastic contact piezoelectric sensor is shown. Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure of the internal elastic contact piezoelectric sensor shown.

[0021] The present invention provides an internal elastic contact piezoelectric sensor, which includes a coaxial radio frequency connector 10, a fixed base 20, a conductive top pin 30, a conductive spring 40, a piezoelectric material 50 and a pressure head 60. The coaxial radio frequency connector 10 is installed at the bottom of the fixed base 20, the conductive top pin 30 and the conductive spring 40 are fixed inside the fixed base 20, one end of the conductive top pin 30 is connected to the coaxial radio frequency connector 10, and the other end is in contact with the piezoelectric material 50 through the conductive spring 40, the conductive spring 40 is wound around one end of the conductive top pin 30 close to the piezoelectric material 50, and the pressure head 60 is installed on the top of the fixed base 20 and in contact with the piezoelectric material 50.

[0022] Specifically, the piezoelectric material 50 includes a quartz plate 51 and an electrode plate 52, and two quartz plates 51 are attached to both sides of the electrode plate 52. The electrode plate 52 is attached to the surface of the quartz plate 51, and the electrode plate 52 is a highly conductive material, which can ensure the effective collection and transmission of charges; the quartz plate 51 has excellent piezoelectric properties and can efficiently convert mechanical stress into electrical signals.

[0023] When external mechanical stress (such as pressure, vibration or shock) acts on the quartz plate 51, the quartz plate 51 will generate electric charge due to its piezoelectric characteristics. This charge is collected by the electrode plate 52 and transmitted to the coaxial RF connector 10 through the conductive spring 40 and the conductive top pin 30, and finally transmitted to the external electronic device or measuring instrument for processing and analysis. In other embodiments, the piezoelectric material 50 is composed of multiple layers of piezoelectric materials with different characteristics to enhance the sensitivity and frequency response range of the sensor.

[0024] Specifically, the coaxial RF connector 10 is used to transmit electrical signals to external electronic devices or measuring instruments, and can transmit high-frequency electrical signals, reducing signal loss and interference. The fixed base 20 is made of a solid material, which can protect the piezoelectric material 50 to ensure the stability and durability of the sensor, provide mechanical support and environmental isolation. The conductive top pin 30 is connected to the coaxial RF connector 10 to ensure the integrity and transmission efficiency of the signal for transmitting the electrical signal to an external electronic device or measuring instrument. The elastic design of the conductive spring 40 can absorb a certain amount of mechanical stress to ensure stable transmission of the signal.

[0025] Furthermore, a hole (not marked in the figure) is provided inside the fixed base 20, and the hole is used to accommodate the conductive top pin 30 and the conductive spring 40. A notch 21 is provided at the bottom of the fixed base, and the notch 21 is used to accommodate and fix the conductive top pin 30. By adopting an elastic contact structure inside the sensor, the complicated process of traditional wire welding is avoided. The combination of the conductive top pin 30 and the conductive spring 40 can ensure that under different mechanical pressures, the electrode sheet 52 inside the sensor and the coaxial RF connector 10 maintain stable electrical contact. By providing a hole and a notch 21 inside the fixed base 20, the conductive top pin 30 and the conductive spring 40 are reasonably accommodated, which not only saves space, but also simplifies the structural design, which is suitable for applications in narrow spaces.

[0026] Specifically, the internal elastic contact piezoelectric sensor further includes an insulating ring 70, and the insulating ring 70 surrounds the edges of the quartz plate 52 and the electrode plate 51. In addition, the piezoelectric material 50 is modularized, and a combined structure of the quartz plate 51 and the electrode plate 52 is used, and surrounded by the insulating ring 70 to ensure stable electrical performance and prevent short circuits.

[0027] Preferably, the top of the fixed base 20 is connected to the pressure head 60 by threads or snaps to form a sealing structure, which further improves the stability and reliability of the sensor.

[0028] Specifically, the end of the pressure head 60 that contacts the fixed base 20 is a stepped protrusion structure (not shown in the figure), the outer diameter of the stepped protrusion structure is the same as the outer diameter of the piezoelectric material 50, and the insulating ring 70 simultaneously wraps the piezoelectric material 50 and the stepped protrusion structure.

[0029] In this embodiment, the end of the pressure head 60 that contacts the fixed base 20 is a stepped shaft structure, and a receiving groove 22 is arranged on the top of the fixed base 20. The stepped shaft structure includes a first step 61 and a second step 62 connected in sequence, and the outer diameter of the first step 61 is the same as the outer diameter of the piezoelectric material 50. The insulating ring 70 wraps the piezoelectric material 50 and the first step 61 at the same time, and the outer diameter of the second step 62 is smaller than the inner diameter of the receiving groove 22. Through the stepped shaft structure, the connection stability between the pressure head 60 and the fixed base 20 is strengthened, and the stability and reliability of the internal elastic contact piezoelectric sensor are further improved.

[0030] In addition, the internal elastic contact piezoelectric sensor further includes an insulating tube 80, which is disposed inside the fixed base 20 and is used to wrap the conductive spring 40 and the conductive top pin 30. Specifically, one end of the insulating tube 80 is fixed in the fixed base 20, and the other end extends above the electrode sheet 52. The insulating tube 80 is made of insulating material to ensure electrical insulation, and is used to fix the conductive spring 40 and the conductive top pin 30, prevent electrical short circuit and electrical interference, and improve the insulation performance and safety of the sensor.

[0031] In other embodiments, a shock-proof structure (not shown), such as a rubber gasket, is further provided between the fixed base 20 and the pressure head 60 to reduce the influence of external vibration on the measurement accuracy.

[0032] In general, the present invention avoids the complicated process of traditional wire welding by adopting an elastic contact structure inside the sensor, and provides a combination of a conductive top pin 30 and a conductive spring 40, which can ensure that under different mechanical pressures, a stable electrical contact is maintained between the electrode sheet 52 inside the sensor and the coaxial RF connector 10; the elastic contact reduces welding points and improves the connection stability; the reasonable accommodation of the conductive top pin 30 and the conductive spring 40 not only saves space, but also simplifies the structural design, is suitable for applications in narrow spaces, is easy to assemble and disassemble, and is convenient for maintenance; the present invention can not only effectively solve the problem of charge collection and conduction, but also improve the performance and reliability of the internal elastic contact piezoelectric sensor.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An internal elastic contact piezoelectric sensor, characterized in that: It includes a coaxial RF connector, a fixed base, a conductive top pin, a conductive spring, a piezoelectric material and a pressure head, wherein the coaxial RF connector is installed at the bottom of the fixed base, the conductive top pin and the conductive spring are fixed inside the fixed base, one end of the conductive top pin is connected to the coaxial RF connector, and the other end is in contact with the piezoelectric material through the conductive spring, the conductive spring is wound around one end of the conductive top pin close to the piezoelectric material, and the pressure head is installed on the top of the fixed base and in contact with the piezoelectric material.

2. The internal elastic contact piezoelectric sensor according to claim 1, characterized in that: A hole is arranged inside the fixed base, and the hole is used to accommodate the conductive ejector pin and the conductive spring. A notch is arranged at the bottom of the fixed base, and the notch is used to accommodate and fix the conductive ejector pin.

3. The internal elastic contact piezoelectric sensor according to claim 1, characterized in that: The piezoelectric material includes a quartz sheet and an electrode sheet, and two quartz sheets are attached to both sides of the electrode sheet.

4. The internal elastic contact piezoelectric sensor according to claim 3, characterized in that: The internal elastic contact piezoelectric sensor further includes an insulating ring surrounding the edges of the quartz plate and the electrode plate.

5. The internal elastic contact piezoelectric sensor according to claim 4, characterized in that: One end of the pressure head in contact with the fixed base is a step-protrusion structure, the outer diameter of the step-protrusion structure is the same as the outer diameter of the piezoelectric material, and the insulating ring wraps the piezoelectric material and the step-protrusion structure at the same time.

6. The internal elastic contact piezoelectric sensor according to claim 4, characterized in that: The end of the pressure head that contacts the fixed base is a stepped shaft structure, and a receiving groove is set on the top of the fixed base. The stepped shaft structure includes a first step and a second step connected in sequence, and the outer diameter of the first step is the same as the outer diameter of the piezoelectric material. The insulating ring wraps the piezoelectric material and the first step at the same time, and the outer diameter of the second step is smaller than the inner diameter of the receiving groove.

7. The internal elastic contact piezoelectric sensor according to claim 1, characterized in that: The top of the fixed base is connected to the pressure head through threads or buckles to form a sealing structure.

8. The internal elastic contact piezoelectric sensor according to claim 1, characterized in that: The internal elastic contact piezoelectric sensor further comprises an insulating tube, which is arranged inside the fixed base and is used to wrap the conductive spring and the conductive ejector pin.

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