CN213714540U - Waterproof piezoelectric vibration sensor - Google Patents
Waterproof piezoelectric vibration sensor Download PDFInfo
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- CN213714540U CN213714540U CN202022763182.1U CN202022763182U CN213714540U CN 213714540 U CN213714540 U CN 213714540U CN 202022763182 U CN202022763182 U CN 202022763182U CN 213714540 U CN213714540 U CN 213714540U
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Abstract
The utility model provides a waterproof piezoelectric vibration sensor, which is connected with an upper computer and a piece to be measured, wherein the sensor comprises a first metal shell, a second metal shell, a sensor, a printed circuit board and a cable; the sensor and the printed circuit board are arranged in the square shell formed by the first metal shell and the second metal shell, and the cable which is connected with the printed circuit board in a sealing way through the square shell is arranged outside the square shell and is in signal connection with an upper computer; the square shell is fixedly connected with the piece to be measured. The utility model discloses a divide into two spacious metal casing of opening with the sensor and process respectively, then dock sealed processing again and be a whole, when having realized high accuracy processing, reduced the size of sensor, increased the operational capability of sensor simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the sensor is made, specifically speaking relates to a waterproof type piezoelectricity vibration sensor.
Background
The vibration sensor has wide application in many fields, and due to the difference of the design structure of the sensor, the performance index, the application range, the environmental resistance and the like of the vibration sensor are different. In recent years, there has been a demand for miniaturization and integration of vibration sensors, and the use environment has become severer. At present, the protection level of most multiaxial integrated vibration sensor is all not high, can realize the operational environment of several meters depth of water mostly, along with hydraulic increase, the deepening of depth of water, and the requirement to the sensor is higher, and the realization degree of difficulty is big more. In addition, the existing sensor structure is large in size, so that the external dimension of the sensor is at least 15mm multiplied by 15mm, the upper limit of the working frequency of the sensor is only 5k, and the frequency response error is at least within +/-10%.
SUMMERY OF THE UTILITY MODEL
The utility model discloses too big lead to the operating frequency upper limit lower and the error great, the protection rank is not high to current piezoelectric vibration sensor volume, can't realize the work scheduling problem of high hydraulic deep water environment, a waterproof type piezoelectric vibration sensor is proposed, it processes respectively through dividing into the metal casing that two openings are spacious with the sensor, then butt joint sealing process is a whole again, when having realized high accuracy processing, the size of sensor has been reduced, the operational capability of sensor has been increased simultaneously.
The utility model discloses specifically realize the content as follows:
the utility model provides a waterproof piezoelectric vibration sensor, which is connected with an upper computer and a piece to be measured, wherein the sensor comprises a first metal shell, a second metal shell, a sensor, a printed circuit board and a cable;
the sensor and the printed circuit board are arranged in the square shell formed by the first metal shell and the second metal shell, and the cable which is connected with the printed circuit board in a sealing way through the square shell is arranged outside the square shell and is in signal connection with an upper computer;
the square shell is fixedly connected with the piece to be measured.
In order to better realize the utility model, a boss is further arranged on the inner side of one shell surface of the second metal shell; the sensor is arranged on the boss and connected with the printed circuit board.
In order to realize better the utility model discloses, furtherly, the inductor is three groups, sets up on the boss towards X axle, Y axle and Z axle direction, printed circuit board sets up three groups equally, corresponds with the inductor respectively and is connected.
In order to realize better the utility model discloses, furtherly, three groups among the printed circuit board, correspond X axial printed circuit board and install on the second metal casing, correspond Y axial and Z axial printed circuit board among three groups of printed circuit boards and install respectively on first metal casing.
In order to better implement the present invention, further, the sensor includes a piezoelectric sensing element, a mass block, and a pre-tightening cylinder; the electric sensitive element, the mass block and the pre-tightening cylinder are of an annular structure formed by tightly attaching three layers to form an integrated sensor.
In order to better realize the utility model, the metal jacket is further included and is arranged outside the second metal shell; the cable is connected with a printed circuit board in the square shell through a metal sheath.
In order to better realize the utility model discloses, further, still include the test mounting hole, the test mounting hole sets up on square casing.
In order to better realize the utility model discloses, furtherly, the test mounting hole has two sets ofly, sets up respectively do not install metal sheath's two casing face outsides on the second metal casing.
In order to better realize the utility model, further, the square shell size that first metal casing and second metal casing constitute is 10 mm.
In order to better realize the utility model, furthermore, the size of the square shell formed by the first metal shell and the second metal shell is 10mm × 10mm × 10mm, the second metal shell is provided with a round hole with the diameter of 6mm, the inner diameter of the metal sheath is 6mm, the metal sheath is matched with the round hole on the second metal shell for sealing installation, and the outermost end of the metal sheath is provided with a round hole with the inner diameter of 5 mm; the cable passes through the second metal shell and the round holes in the metal sheath and is connected with the printed circuit board in the square shell; and waterproof adhesive is filled in the gap between the metal sheath and the cable for fixing and sealing the cable.
In order to better implement the present invention, further, the printed circuit board adopts an analog circuit in an IEPE form, a charge signal amplifying circuit and a converting circuit including a field effect transistor and a resistance-capacitance device.
Compared with the prior art, the utility model have following advantage and beneficial effect:
the sensor designed by the novel sensor structure adopts a novel sensor structure, the sensor has small volume and light weight, the working frequency range and the response error of the sensor are improved while the miniaturization function of the sensor is realized, the upper limit of the frequency response can reach 7k, the frequency response error can be controlled within +/-5 percent, the overall dimension of the sensor is only 10mm multiplied by 10mm (without a cable part), and the sensor designed by the novel sensor structure has a wide application range, can be used in the field of industrial measurement and control, and can also be used in the field of aerospace for testing weak vibration signals. After the sensor is assembled, the sensor can normally work in the water depth of hundred meters, the working environment temperature is-55-125 ℃, the measurable frequency response range is 10-7000 Hz, and the output voltage sensitivity is 100 mv/g.
Drawings
FIG. 1 is a front sectional view of the structure of the device of the present invention;
FIG. 2 is a schematic view of the installation of the test installation hole of the present invention;
FIG. 3 is a schematic diagram of the connection and circulation of the test signal of the present invention;
fig. 4 is a schematic diagram of the circuit principle of the simple printed circuit board of the present invention.
Wherein: 1. the device comprises a first metal shell, a second metal shell, a sensor, a piezoelectric sensitive element, a mass block, a sensor 301, a piezoelectric sensitive element 302, a mass block 303, a pre-tightening cylinder 4, a printed circuit board 5, a metal sheath 6, a cable 7 and a test mounting hole.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments, and therefore should not be considered as limitations to the scope of protection. Based on the embodiments in the present invention, all other embodiments obtained by the staff of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the embodiment provides a waterproof piezoelectric vibration sensor which is connected with an upper computer and a piece to be detected, and the sensor comprises a first metal shell 1, a second metal shell 2, a sensor 3, a printed circuit board 4 and a cable 6;
the first metal shell 1 and the second metal shell 2 are of a three-surface structure which can be matched with each other and spliced into a square shell, the sensor 3 and the printed circuit board 4 are arranged in the square shell formed by the first metal shell 1 and the second metal shell 2, and the cable 6 which is hermetically connected with the printed circuit board 4 through the square shell is arranged outside the square shell and is in signal connection with an upper computer;
the sensor 3 comprises a piezoelectric sensitive element 301, a mass block 302 and a pre-tightening cylinder 303; the electric sensitive element 301, the mass block 302 and the pre-tightening cylinder 303 are in an annular structure with three layers tightly attached to form an integrated sensor; the piezoelectric sensing element 301 and the mass block 303 are integrally fixed on a boss of the second metal shell 2 through a pre-tightening cylinder 303;
the square shell is fixedly connected with the piece to be detected;
the size of the square shell formed by the first metal shell 1 and the second metal shell 2 is 10mm multiplied by 10 mm.
The working principle is as follows: the sensor adopts a full-sealed design, meets the IP68 protection grade, and can be used in the environment of hundreds of meters of water depth. The shell of the utility model adopts a laser welding mode to ensure air tightness and carries out air tightness inspection treatment on the welding position; the cable is designed to be waterproof by adopting a sealing mode of waterproof adhesive so as to ensure the waterproof performance of the sensor. Compared with the prior art, the utility model discloses a sensor can normally work under 100 meters depth of water, and the sensor of current voltage signal output then can only bear several meters depth of water mostly.
The utility model discloses a sensor adopts is novel by the sensor structure, this is felt sensor small, the quality is light, in the miniaturized function of realization sensor, the operating frequency range and the response error of sensor have been promoted, the frequency response upper limit can reach 7k, the frequency response error is steerable within +/-5%, the overall dimension of sensor only is 10mm (not containing the cable part), with this novel by the concrete very extensive application range of sensor structural design, not only can be used for industry observing and controlling, still can be applied to the aerospace field, be used for testing weak vibration signal. The existing sensor structure has large volume, so that the external dimension of the sensor is at least 15mm multiplied by 15mm, the upper limit of the working frequency of the sensor is only 5k, and the frequency response error is at least within +/-10%.
The utility model discloses what sensor adopted is the casing design of novel structure, because the volume of sensor is less, the inner space is little, and the assembly degree of difficulty is very big, and in order to realize maneuverability, the casing adopts split type butt joint mode, and two casings are three face respectively promptly, adopt welded mode to dock, and this kind of mode will inside the abundant exposure of cavity, greatly reduced the assembly degree of difficulty, ensured the assembly nature of sensor. The existing shell mode adopts a mode of a circular cover plate, and the internal cavity is exposed to a small extent and can hardly operate under the condition of small sensor volume.
The all-metal shell is sealed, the circuit board is directly fixed in the first metal shell 1 and the second metal shell 2, no special mechanical fixing component is needed, and the requirements of enduring severe electromagnetic environment, underwater working environment, mechanical stress environment and the like are met.
Example 2:
in this embodiment, on the basis of the above embodiment 1, in order to better implement the present invention, further, a boss is disposed inside one of the shell surfaces of the second metal shell 2; the sensor 3 is mounted on the boss and connected with the printed circuit board.
In order to realize better the utility model discloses, furtherly, inductor 3 is three groups, sets up on the boss towards X axle, Y axle and Z axle direction, printed circuit board 4 sets up three groups equally, corresponds with inductor 3 respectively and is connected.
In order to better realize the utility model discloses, furtherly, three groups among the printed circuit board 4, correspond X axial printed circuit board 4 and install on second metal casing 2, correspond Y axial and Z axial printed circuit board 4 and install respectively on first metal casing 1 among three groups of printed circuit board 4.
The working principle is as follows: three sensors 3 are respectively arranged on the inner bosses of the second metal shell 2, a shell surface of the second metal shell 2 is fixed with a printed circuit board 4 which is used for signal conditioning and has the X axial direction, two shell surfaces of the second metal shell 1 are respectively fixed with printed circuit boards 4 which have the Y axial direction and the Z axial direction, the sensors 3 are connected with the printed circuit boards 4 by adopting leads, and the first metal shell 1 and the second metal shell 2 form rigid connection by adopting a laser welding mode.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
Example 3:
in this embodiment, on the basis of any one of the above embodiments 1-2, in order to better implement the present invention, further, the metal sheath 5 is further included, and the metal sheath 5 is installed on the outside of the second metal shell 2; the cable 6 is connected with the printed circuit board 4 in the square shell through the metal sheath 5.
Other parts of this embodiment are the same as any of embodiments 1-2 described above, and thus are not described again.
Example 4:
this embodiment is based on any one of the above embodiments 1-3, and in order to better implement the present invention, further, the present invention further includes a test mounting hole 7, and the test mounting hole 7 is disposed on the square housing.
In order to better realize the utility model discloses, furtherly, test mounting hole 7 has two sets ofly, sets up respectively do not install two shell face outsides of metal sheath 5 on second metal casing 2.
The working principle is as follows: the product is installed on the vibration test fixture through the installation test holes in the second metal shell 2, the vibration test fixture has a triaxial test function, and three axial performance tests are realized by changing the installation positions of the two installation holes in the metal shell 2 on the vibration test fixture.
Other parts of this embodiment are the same as any of embodiments 1 to 3, and thus are not described again.
Example 5:
in this embodiment, on the basis of any one of the above embodiments 1 to 4, in order to better implement the present invention, further, the size of the square casing formed by the first metal casing 1 and the second metal casing 2 is 10mm × 10mm, a circular hole with a diameter of 6mm is arranged on the second metal casing 2, the inner diameter of the metal sheath 5 is 6mm, the metal sheath is matched with the circular hole on the second metal casing 2 for sealing installation, and the outermost end of the metal sheath 5 is provided with a circular hole with an inner diameter of 5 mm; the cable 6 passes through round holes on the second metal shell 2 and the metal sheath 5 and is connected with the printed circuit board 4 in the square shell; and waterproof adhesive is filled in the gap between the metal sheath 5 and the cable 6 for fixing and sealing the cable.
Other parts of this embodiment are the same as any of embodiments 1 to 4, and thus are not described again.
Example 6:
in this embodiment, on the basis of any one of the above embodiments 1 to 5, as shown in fig. 4, in order to better implement the present invention, further, the printed circuit board 4 adopts an analog circuit in the form of IEPE, a charge signal amplifying circuit and a converting circuit including a field effect transistor and a resistance-capacitance device.
The working principle is as follows: when the sensor works, the sensor and a measured object are rigidly connected through a mounting screw, a vibration signal of the measured object is transmitted to a sensor 3 through a second metal shell 2 of the sensor, the sensor combination converts the sensed vibration signal into a charge signal to be output, the charge signal is output to a printed circuit board 4 through a lead, the printed circuit board 4 amplifies the charge signal and then transmits the amplified charge signal to a cable, and finally the cable is output to a rear-end signal acquisition system to be analyzed and processed.
The implementation schematic diagram of the sensor circuit part is shown in fig. 4, the circuit adopts an analog circuit and is in an IEPE form, and the amplification and conversion functions of charge signals are realized by using a circuit principle that a field effect transistor and a resistance-capacitance device are jointly constructed.
Other parts of this embodiment are the same as any of embodiments 1 to 5, and thus are not described again.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (10)
1. A waterproof piezoelectric vibration sensor is connected with an upper computer and a piece to be detected and is characterized by comprising a first metal shell (1), a second metal shell (2), a sensor (3), a printed circuit board (4) and a cable (6);
the sensor (3) and the printed circuit board (4) are arranged in the square shell formed by the first metal shell (1) and the second metal shell (2), and the cable (6) which is connected with the printed circuit board (4) in a sealing way through the square shell is arranged outside the square shell and is in signal connection with an upper computer;
the square shell is fixedly connected with the piece to be measured.
2. A waterproof type piezoelectric vibration sensor according to claim 1, wherein a boss is provided inside one case surface of the second metal case (2); the sensor (3) is arranged on the boss and connected with the printed circuit board.
3. A waterproof piezoelectric vibration sensor according to claim 2, wherein the sensors (3) are provided in three sets on the boss in directions toward the X-axis, Y-axis and Z-axis, and the printed circuit board (4) is also provided in three sets respectively connected to the sensors (3);
among the three groups of printed circuit boards (4), the printed circuit boards (4) corresponding to the X axial direction are installed on the second metal shell (2), and the printed circuit boards (4) corresponding to the Y axial direction and the Z axial direction in the three groups of printed circuit boards (4) are respectively installed on the first metal shell (1).
4. A water-resistant piezoelectric vibration sensor according to claim 3, wherein the sensor (3) comprises a piezoelectric sensing element (301), a mass (302), a pre-tensioned cylinder (303); the electric sensitive element (301), the mass block (302) and the pre-tightening cylinder (303) are three layers and are tightly attached to form an annular structure of the integrated sensor.
5. A water-resistant piezoelectric vibration sensor according to any one of claims 1 to 4, further comprising a metal sheath (5), the metal sheath (5) being mounted on the outside of the second metal case (2); the cable (6) is connected with the printed circuit board (4) in the square shell through the metal sheath (5).
6. The waterproof type piezoelectric vibration sensor according to claim 5, further comprising a test mounting hole (7), wherein the test mounting hole (7) is provided on a square housing.
7. A water-resistant piezoelectric vibration sensor according to claim 6, wherein two sets of the test fitting holes (7) are provided respectively on the outer sides of the two case faces of the second metal case (2) on which the metal sheath (5) is not mounted.
8. A water-resistant piezoelectric vibration sensor according to any one of claims 1 to 4, wherein the first metal case (1) and the second metal case (2) constitute a square case having dimensions of 10mm x 10 mm.
9. The waterproof piezoelectric vibration sensor according to claim 7, wherein the first metal case (1) and the second metal case (2) form a square case having a size of 10mm x 10mm, the second metal case (2) is provided with a circular hole having a diameter of 6mm, the metal sheath (5) has an inner diameter of 6mm, and is fitted and sealed with the circular hole of the second metal case (2), and the outermost end of the metal sheath (5) is provided with a circular hole having an inner diameter of 5 mm; the cable (6) penetrates through round holes in the second metal shell (2) and the metal sheath (5) and is connected with the printed circuit board (4) in the square shell; and waterproof adhesive is filled in the gap between the metal sheath (5) and the cable (6) for fixing and sealing the cable.
10. A water-resistant piezoelectric vibration sensor according to any one of claims 1 to 4, wherein the printed circuit board (4) employs analog circuits in the form of IEPE including a charge signal amplifying circuit and a converting circuit including a field effect transistor and a resistance-capacitance element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022763182.1U CN213714540U (en) | 2020-11-25 | 2020-11-25 | Waterproof piezoelectric vibration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022763182.1U CN213714540U (en) | 2020-11-25 | 2020-11-25 | Waterproof piezoelectric vibration sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213714540U true CN213714540U (en) | 2021-07-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022763182.1U Active CN213714540U (en) | 2020-11-25 | 2020-11-25 | Waterproof piezoelectric vibration sensor |
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|---|---|
| CN (1) | CN213714540U (en) |
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2020
- 2020-11-25 CN CN202022763182.1U patent/CN213714540U/en active Active
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