Piezoelectric sensor

Abstract

The utility model discloses a piezoelectric sensor which comprises a shell, a second electrode slice is fixedly connected to the upper surface of a supporting plate, a first electrode slice is fixedly connected to the upper surface of a piezoelectric ceramic slice, a mass block is fixedly connected to the upper surface of the first electrode slice, a pre-tightening elastic piece is fixedly connected to the top end of a supporting column, and a second electrode slice is fixedly connected to the top end of the supporting column. The outer surface of the piezoelectric ceramic piece is fixedly connected with a heat conduction layer, and the outer surface of the hydrophobic layer is fixedly connected with an electromagnetic shielding layer. According to the piezoelectric sensor, through the arrangement of the pre-tightening elastic piece, the mass block, the piezoelectric ceramic piece, the heat conduction layer, the hydrophobic layer and the electromagnetic shielding layer, pressure is applied to the top end of the shell, the pressure is transmitted to the mass block through the pre-tightening elastic piece, the piezoelectric ceramic piece generates current, the heat conduction layer absorbs heat generated by the sensor, and the influence of temperature rise on internal elements is reduced; the hydrophobic layer can absorb entering water vapor and can also provide a space for heat absorption expansion of the heat conduction layer, long-term reliable operation of the sensor is ensured, and good sensing performance can also be maintained.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a piezoelectric sensor. Background Technology

[0002] Industrial equipment commonly experiences vibrations of varying degrees during operation. Severe vibrations can reduce equipment efficiency and the precision of actuators, disrupt machine operation, and even shorten equipment lifespan. Therefore, it is necessary to detect relevant vibration data. Currently, vibration detection information is primarily obtained through vibration sensors. Vibration sensors mainly include piezoelectric, piezoresistive, and piezoresistive types, with piezoelectric vibration sensors being the most common.

[0003] Current piezoelectric sensors are significantly affected by ambient temperature and humidity, resulting in poor long-term stability. Frequent temperature and humidity fluctuations limit the measurement accuracy of the sensors. At the same time, vibrations in the external environment can also affect the sensor's measurement. Springs not only produce resonance but also cannot reduce multi-directional vibrations. Therefore, it is necessary to design a piezoelectric sensor. Utility Model Content

[0004] The main objective of this invention is to provide a piezoelectric sensor that can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A piezoelectric sensor includes a housing, a support plate fixedly connected to the inner wall of the housing, a pillar fixedly connected to the upper surface of the support plate, a second electrode plate fixedly connected to the upper surface of the support plate, a piezoelectric ceramic plate fixedly connected to the upper surface of the second electrode plate, a first electrode plate fixedly connected to the upper surface of the piezoelectric ceramic plate, a mass block fixedly connected to the upper surface of the first electrode plate, a preload spring fixedly connected to the top of the pillar, a thermally conductive layer fixedly connected to the outer surface of the piezoelectric ceramic plate, a hydrophobic layer fixedly connected to the outer surface of the thermally conductive layer, and an electromagnetic shielding layer fixedly connected to the outer surface of the hydrophobic layer.

[0007] In order to achieve the purpose of electronic shielding of the internal electronic components of the sensor, as a piezoelectric sensor of this utility model, the electromagnetic shielding layer is fixedly connected to the inner wall of the shell, and the hydrophobic layer is fixedly connected to the outer surface of the mass block.

[0008] In order to facilitate the transfer of electrical energy from the sensor, as a piezoelectric sensor of this utility model, lead cables are fixedly connected to one side of the outer surface of the first electrode sheet and the second electrode sheet.

[0009] In order to realize the purpose of reducing the influence of accidental vibration on the sensor, as a piezoelectric sensor, the lower surface of the supporting plate is fixedly connected with a damper, the lower surface of the supporting plate is fixedly connected with a spring, and the bottom end of the shell is fixedly connected with a base.

[0010] In order to realize the purpose of multi-directional vibration reduction, as a piezoelectric sensor, the damper and the spring have ten groups, one side of the five groups of the damper and the spring is fixedly connected with the inner wall of the shell, and one side of the five groups of the damper and the spring is fixedly connected with the base.

[0011] In order to realize the purpose of facilitating the connection of the sensor, as a piezoelectric sensor, the lower surface of the base is fixedly connected with a fastening bolt, and the lower surface of the fastening bolt is fixedly connected with a threaded column.

[0012] Compared with the prior art, the piezoelectric sensor has the following beneficial effects:

[0013] 1. In the piezoelectric sensor, the pre-tightening spring, the mass block, the piezoelectric ceramic sheet, the heat-conducting layer, the hydrophobic layer and the electromagnetic shielding layer are arranged to press the top end of the shell, the pressure is transmitted to the mass block through the pre-tightening spring, the piezoelectric ceramic sheet generates current, the heat-conducting layer can absorb the heat generated by the sensor, the influence of temperature rise on the internal elements is reduced, the hydrophobic layer can absorb the water vapor that may enter the inside, and can also provide expansion space for the heat-absorbing expansion of the heat-conducting layer, so that the sensor can be reliably operated for a long time, and the sensing performance can be maintained.

[0014] 2. In the piezoelectric sensor, the damper, the spring and the base are arranged, when the sensor works, the outside will vibrate, the damper can consume energy when the spring is elastically deformed, the continuous transmission and amplification of vibration is inhibited, the occurrence of resonance phenomenon is prevented, the damper and the spring are fixed on the shell and the base, the vibration interference of the external environment can be effectively isolated, the piezoelectric element in the sensor is in a relatively stable stress state, and therefore the measurement accuracy of the sensor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a front view structural schematic diagram of the embodiment of the utility model;

[0016] Figure 2 It is a sectional view structural schematic diagram of the embodiment of the utility model;

[0017] Figure 3 It is a heat-conducting layer structure schematic diagram of the embodiment of the utility model;

[0018] Figure 4 It is a spring structure schematic diagram of the embodiment of the utility model;

[0019] Figure 5 This is a schematic diagram of the support plate structure according to an embodiment of the present utility model.

[0020] In the diagram: 1. Outer shell; 2. Fastening bolt; 3. Threaded post; 4. Preload spring; 5. Mass block; 6. Support column; 7. Support plate; 8. Base; 9. First electrode plate; 10. Piezoelectric ceramic plate; 11. Second electrode plate; 12. Lead-out cable; 13. Electromagnetic shielding layer; 14. Hydrophobic layer; 15. Thermal conductive layer; 16. Damper; 17. Spring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example

[0023] like Figures 1-5 As shown, a piezoelectric sensor includes a housing 1, a support plate 7 fixedly connected to the inner wall of the housing 1, a pillar 6 fixedly connected to the upper surface of the support plate 7, a second electrode plate 11 fixedly connected to the upper surface of the support plate 7, a piezoelectric ceramic plate 10 fixedly connected to the upper surface of the second electrode plate 11, a first electrode plate 9 fixedly connected to the upper surface of the piezoelectric ceramic plate 10, a mass block 5 fixedly connected to the upper surface of the first electrode plate 9, a pre-tightening spring 4 fixedly connected to the top of the pillar 6, a thermally conductive layer 15 fixedly connected to the outer surface of the piezoelectric ceramic plate 10, a hydrophobic layer 14 fixedly connected to the outer surface of the thermally conductive layer 15, and an electromagnetic shielding layer 13 fixedly connected to the outer surface of the hydrophobic layer 14.

[0024] In practical use, pressure is applied to the top of the outer shell 1 through the arrangement of the pre-tightening spring 4, the mass block 5, the piezoelectric ceramic sheet 10, the thermally conductive layer 15, the hydrophobic layer 14, and the electromagnetic shielding layer 13. The pressure is transmitted to the mass block 5 through the pre-tightening spring 4, causing the piezoelectric ceramic sheet 10 to generate current. The thermally conductive layer 15 can absorb the heat generated by the sensor, reducing the impact of temperature rise on internal components. The hydrophobic layer 14 can absorb water vapor that may enter the interior, and at the same time, it can provide expansion space for the thermally conductive layer 15 to absorb heat and expand. The electromagnetic shielding layer 13 can block external electromagnetic interference to the internal electronic components of the sensor.

[0025] In this embodiment, the electromagnetic shielding layer 13 is fixedly connected to the inner wall of the outer shell 1, and the hydrophobic layer 14 is fixedly connected to the outer surface of the mass block 5.

[0026] In specific use, through the arrangement of the hydrophobic layer 14, the hydrophobic layer 14 can absorb all the water vapor entering the sensor.

[0027] In the embodiment, one side of the outer surface of the first electrode sheet 9 and the second electrode sheet 11 is fixedly connected with the lead cable 12.

[0028] In specific use, through the arrangement of the lead cable 12, the piezoelectric ceramic sheet 10 generates current after being pressed, and the current is transmitted to the outside through the lead cable 12.

[0029] In the embodiment, the lower surface of the support plate 7 is fixedly connected with the damper 16, the lower surface of the support plate 7 is fixedly connected with the spring 17, and the bottom end of the shell 1 is fixedly connected with the base 8.

[0030] In specific use, through the arrangement of the damper 16 and the spring 17, the damper 16 can consume energy when the spring 17 is elastically deformed, inhibit the continuous transmission and amplification of vibration, and prevent the occurrence of resonance phenomenon.

[0031] In the embodiment, there are ten groups of dampers 16 and springs 17, and five of the dampers 16 and springs 17 are fixedly connected with the inner wall of the shell 1, and the other five are fixedly connected with the base 8.

[0032] In specific use, through the arrangement of the damper 16, the spring 17 and the base 8, half of the dampers 16 and springs 17 are fixed on the shell 1 and the other half are fixed on the base 8, which can effectively isolate the vibration interference of the external environment and make the piezoelectric element in the sensor be in a relatively stable stress state.

[0033] In the embodiment, the lower surface of the base 8 is fixedly connected with the fastening bolt 2, and the lower surface of the fastening bolt 2 is fixedly connected with the threaded column 3.

[0034] In specific use, through the arrangement of the fastening bolt 2 and the threaded column 3, the sensor can be stably installed at a specified position.

[0035] Working principle: in the use process, use fastening bolt 2 and threaded column 3 to install sensor stably in the designated position, give the top end pressure of shell 1, and the pressure is transmitted to mass block 5 through pre-tightening spring 4, and then is transmitted to piezoelectric ceramic sheet 10, piezoelectric ceramic sheet 10 generates electric current after being subjected to pressure, and the electric current is transmitted to the outside through lead-out cable 12, heat-conducting layer 15 can absorb the heat generated by pressure sensor, reduces the influence of temperature rise on internal components, hydrophobic layer 14 can absorb the water vapor that can enter inside, can also provide expansion space for heat-absorbing expansion of heat-conducting layer 15, electromagnetic shielding layer 13 can block the electromagnetic interference of external electromagnetic on internal electronic components of sensor, damper 16 and spring 17 are fixed on shell 1 and base 8, can effectively isolate the vibration interference of external environment, makes the piezoelectric element in the sensor inside be in the relative stable stress state.

[0036] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above.The skilled person in the art should understand that the utility model is not limited by the above-described embodiments, and the above-described embodiments and the description in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed.The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A piezoelectric sensor comprising a housing (1), characterized in that: The inner wall of the shell (1) is fixedly connected with a support plate (7), the upper surface of the support plate (7) is fixedly connected with a support column (6), the upper surface of the support plate (7) is fixedly connected with a second electrode sheet (11), the upper surface of the second electrode sheet (11) is fixedly connected with a piezoelectric ceramic sheet (10), the upper surface of the piezoelectric ceramic sheet (10) is fixedly connected with a first electrode sheet (9), the upper surface of the first electrode sheet (9) is fixedly connected with a mass block (5), the top end of the support column (6) is fixedly connected with a pre-tightening spring piece (4), the outer surface of the piezoelectric ceramic sheet (10) is fixedly connected with a heat conduction layer (15), the outer surface of the heat conduction layer (15) is fixedly connected with a hydrophobic layer (14), and the outer surface of the hydrophobic layer (14) is fixedly connected with an electromagnetic shielding layer (13).

2. A piezoelectric sensor according to claim 1, characterised in that: The electromagnetic shielding layer (13) is fixedly connected with the inner wall of the shell (1), and the hydrophobic layer (14) is fixedly connected with the outer surface of the mass block (5).

3. A piezoelectric sensor according to claim 1, wherein: The outer surface of the first electrode sheet (9) and the second electrode sheet (11) is fixedly connected with a lead-out cable (12) on one side.

4. A piezoelectric sensor according to claim 1, wherein: The lower surface of the support plate (7) is fixedly connected with a damper (16), and the lower surface of the support plate (7) is fixedly connected with a spring (17); and the bottom end of the shell (1) is fixedly connected with a base (8).

5. A piezoelectric sensor according to claim 4, characterised in that: There are ten groups of the damper (16) and the spring (17), five of which are fixedly connected with the inner wall of the shell (1) on one side, and the other five are fixedly connected with the base (8) on one side.

6. A piezoelectric sensor according to claim 4, wherein: The lower surface of the base (8) is fixedly connected with a fastening bolt (2), and the lower surface of the fastening bolt (2) is fixedly connected with a threaded column (3).

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