High-sensitivity piezoelectric acceleration sensor

Abstract

The utility model relates to the technical field of piezoelectric acceleration sensors, and discloses a high-sensitivity piezoelectric acceleration sensor, which comprises a base, the top of the base is provided with a shell, the shell is internally provided with a core body protection shell, the core body protection shell is internally provided with a sensing core body, and the sensing core body is internally provided with a sensor. The top of the core body protection shell is provided with an isolation pressing block, and the top of the isolation pressing block is fixedly connected with a connector, so that the device can carry out the sealing processing of the connector through a sealing cylinder and a sealing chassis, and can avoid the damage of the piezoelectric acceleration sensor caused by the water or dust entering the connector when the device is not used for a long time. And in addition, when the sealing cylinder is used for sealing treatment, the sealing cylinder can be fixed through the mortise lock mechanism, so that the sealing cylinder can be prevented from falling off from the sealing base plate due to collision or accidental falling, and the sealing stability of the sealing cylinder is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of piezoelectric acceleration sensors, in particular to a high-sensitivity piezoelectric acceleration sensor. Background Art

[0002] Electric acceleration sensor, also known as piezoelectric accelerometer, is an inertial sensor. The principle of piezoelectric acceleration sensor is to use the piezoelectric effect of piezoelectric element. When the accelerometer is vibrated, the force of the mass block on the piezoelectric element also changes. When the measured vibration frequency is much lower than the natural frequency of the accelerometer, the change in force is proportional to the measured acceleration. In all engineering fields, when designing, testing and monitoring structures and machinery, the measurement of shock and vibration is extremely important. Piezoelectric acceleration sensor has a series of advantages such as high precision, wide available frequency range, small size, light weight, long life, self-powered, easy installation, etc., so it is widely used in shock and vibration measurement.

[0003] For example, the Chinese patent with patent application number 202222581122.7 is a piezoelectric acceleration sensor. This patent integrates the piezoelectric acceleration sensor with the IC circuit, does not require an external amplifier, and can be directly connected to the display and acquisition instruments, which simplifies the on-site connection of the test system and improves the test accuracy and reliability. The signal ground of the piezoelectric acceleration sensor in this application is isolated from the casing, and has strong anti-interference ability. The piezoelectric acceleration sensor has the performance advantages of small size, high sensitivity, and wide frequency response range.

[0004] However, the above patent does not perform waterproof and dustproof treatment on the outside of the connector when in use, which results in the piezoelectric acceleration sensor being easily damaged due to water or dust entering the connector when not in use for a long time, thereby seriously affecting the storage safety of the piezoelectric acceleration sensor. Utility Model Content

[0005] The utility model aims to provide a high-sensitivity piezoelectric acceleration sensor, which solves the problems raised in the background technology.

[0006] An embodiment of the present application provides a high-sensitivity piezoelectric acceleration sensor, including a base, a shell installed on the top of the base, a core protection shell is arranged inside the shell, a sensor core is arranged inside the core protection shell, an isolation block is installed on the top of the core protection shell, a connector is fixedly connected to the top of the isolation block, and a sealing component is arranged on the outer surface of the connector.

[0007] By adopting the above technical solution, the device can use the core protective shell (isolation and shielding) to avoid ground loops and erroneous signals generated by electromagnetic and radio frequency interference pickup, thereby greatly improving the detection accuracy of the device.

[0008] Optionally, the sealing assembly includes a sealing chassis installed on the outer surface of the connector, and the top of the sealing chassis is fixedly connected to a sealing cylinder via a latch mechanism.

[0009] By adopting the above technical solution, the device can seal the connector through the sealing tube and the sealing chassis, thereby preventing the piezoelectric acceleration sensor from being damaged due to water or dust entering the connector when not used for a long time, thereby greatly improving the practicality of the device.

[0010] Optionally, the latch mechanism includes fixed plates installed on both sides of the top of the sealing chassis and grooves opened on both sides of the sealing cylinder. The fixed plate is movably connected to a pull rod inside, one end of the pull rod extends into the interior of the groove, and the other end of the pull rod passes through the other side of the fixed plate and is fixedly connected to a pull plate. A return spring is provided on the outer surface of the pull rod between the pull plate and the fixed plate.

[0011] By adopting the above technical solution, the device can fix the sealing cylinder through the latch mechanism, thereby preventing the sealing cylinder from falling off from the sealing chassis due to collision or accidental falling, thereby greatly improving the sealing stability of the sealing cylinder.

[0012] Optionally, a positioning groove is provided at the top of the pull rod, a positioning pin is provided inside the positioning groove, and the top of the positioning pin extends to above the fixing plate.

[0013] By adopting the above technical solution, the positioning effect of the positioning pin and the positioning groove is utilized to achieve a better fixing effect of the device.

[0014] Optionally, an anti-slip sleeve is fixedly connected to the outer surface of the pull plate.

[0015] By adopting the above technical solution, the anti-slip sleeve can be used to prevent the operator from slipping when pulling the pull plate.

[0016] Optionally, the sensor core adopts a ceramic shear structure.

[0017] By adopting the above technical solutions, the detection effect of the device is better because the ceramic sensing element has excellent resolution and durability in noisy environments and can be designed to provide low-frequency and high-frequency measurements, while the shear design sensor is insensitive to adverse environmental influences (such as housing or base strain and thermal transients).

[0018] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0019] The technical solution of the present application provides a sealing chassis, a sealing cylinder, a fixing plate, a groove, a pull rod, a pull plate, a reset spring, a positioning groove and a positioning pin, so that the device can seal the connector through the sealing cylinder and the sealing chassis, thereby preventing the piezoelectric acceleration sensor from being damaged due to water or dust entering the connector when not in use for a long time, thereby greatly improving the practicality of the device. In addition, when the sealing cylinder is used for sealing, the sealing cylinder can be fixed by a locking mechanism, thereby preventing the sealing cylinder from falling off from the sealing chassis due to collision or accidental falling, thereby greatly improving the sealing stability of the sealing cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a high-sensitivity piezoelectric acceleration sensor of the utility model;

[0022] Figure 2 This is a schematic diagram of the overall internal structure of a high-sensitivity piezoelectric acceleration sensor of the utility model;

[0023] Figure 3 This utility model is a high-sensitivity piezoelectric acceleration sensor Figure 2 Enlarged view of point A in the middle.

[0024] In the figure: 1. base; 2. outer shell; 3. core protection shell; 4. sensor core; 5. isolation pressure block; 6. connector; 7. sealing chassis; 8. sealing cylinder; 9. fixing plate; 10. groove; 11. pull rod; 12. pull plate; 13. reset spring; 14. positioning groove; 15. positioning pin. DETAILED DESCRIPTION

[0025] See also Figure 1-3 The utility model provides a technical solution: a high-sensitivity piezoelectric acceleration sensor, including a base 1, a shell 2 is installed on the top of the base 1, a core protection shell 3 is arranged inside the shell 2, a sensing core 4 is arranged inside the core protection shell 3, an isolation block 5 is installed on the top of the core protection shell 3, a connector 6 is fixedly connected to the top of the isolation block 5, and a sealing component is arranged on the outer surface of the connector 6.

[0026] By adopting the above technical solution, the device can isolate and shield the erroneous signals generated by avoiding ground loops and electromagnetic and radio frequency interference pickup through the core protective shell 3, thereby greatly improving the detection accuracy of the device.

[0027] In the implementation mode of the present application, Figure 2As shown, the sealing assembly includes a sealing chassis 7 installed on the outer surface of the connector 6, and a sealing cylinder 8 is fixedly connected to the top of the sealing chassis 7 through a latch mechanism.

[0028] By adopting the above technical solution, the device can seal the connector 6 through the sealing tube 8 and the sealing chassis 7, thereby preventing the piezoelectric acceleration sensor from being damaged due to water or dust entering the connector 6 when not used for a long time, thereby greatly improving the practicality of the device.

[0029] In the implementation mode of the present application, Figure 2-3 As shown, the latch mechanism includes fixed plates 9 installed on both sides of the top of the sealing chassis 7 and grooves 10 opened on both sides of the sealing tube 8. A pull rod 11 is movably connected inside the fixed plate 9. One end of the pull rod 11 extends to the inside of the groove 10, and the other end of the pull rod 11 passes through the other side of the fixed plate 9 and is fixedly connected to a pull plate 12. A return spring 13 is provided on the outer surface of the pull rod 11 between the pull plate 12 and the fixed plate 9.

[0030] By adopting the above technical solution, the device can fix the sealing cylinder 8 through the locking mechanism, thereby preventing the sealing cylinder 8 from falling off from the sealing chassis 7 due to collision or accidental falling, thereby greatly improving the sealing stability of the sealing cylinder 8.

[0031] In the implementation mode of the present application, Figure 3 As shown, a positioning groove 14 is formed at the top of the pull rod 11 , a positioning pin 15 is disposed inside the positioning groove 14 , and the top of the positioning pin 15 extends to above the fixing plate 9 .

[0032] By adopting the above technical solution, the positioning pin 15 and the positioning groove 14 are used to achieve a better fixing effect of the device.

[0033] In the implementation mode of the present application, Figure 3 As shown, the outer surface of the pull plate 12 is fixedly connected with an anti-slip sleeve.

[0034] By adopting the above technical solution, the anti-skid sleeve can be used to prevent the operator from slipping when pulling the pull plate 12.

[0035] In the implementation mode of the present application, Figure 2 As shown, the sensing core 4 adopts a ceramic shear structure.

[0036] By adopting the above technical solutions, the detection effect of the device is better because the ceramic sensing element has excellent resolution and durability in noisy environments and can be designed to provide low-frequency and high-frequency measurements, while the shear design sensor is insensitive to adverse environmental influences such as housing or base strain and thermal transients.

[0037] When the operator needs to use the piezoelectric acceleration sensor, the operator can first remove the positioning pin 15 from the positioning groove 14, and then pull the pull rod 11 through the pull plate 12, so that the pull rod 11 stretches the reset spring 13 while disengaging from the groove 10. When the pull rod 11 is completely separated from the groove 10, the operator pulls out the sealing tube 8 upward, so that the connector 6 can be quickly used in conjunction with other electrical components to perform piezoelectric acceleration detection on the device to be detected. When the detection is completed, the operator uses the above to re-sleeve the sealing tube 8 on the outside of the connector 6, so as to avoid damage to the piezoelectric acceleration sensor due to water or dust entering the connector 6 when not used for a long time, thereby greatly improving the practicality of the device. In addition, the sealing tube 8 is fixed by a locking mechanism, so as to avoid the sealing tube 8 from falling off from the sealing chassis 7 due to collision or accidental falling, thereby greatly improving the sealing stability of the sealing tube 8.

Claims

1. A high-sensitivity piezoelectric acceleration sensor, comprising a base (1), characterized in that: A housing (2) is installed on the top of the base (1), a core protection shell (3) is arranged inside the housing (2), a sensing core (4) is arranged inside the core protection shell (3), an isolation pressure block (5) is installed on the top of the core protection shell (3), a connector (6) is fixedly connected to the top of the isolation pressure block (5), and a sealing component is arranged on the outer surface of the connector (6).

2. A high-sensitivity piezoelectric acceleration sensor according to claim 1, characterized in that: The sealing assembly comprises a sealing chassis (7) mounted on the outer surface of the connector (6), and the top of the sealing chassis (7) is fixedly connected to a sealing cylinder (8) via a latching mechanism.

3. A high-sensitivity piezoelectric acceleration sensor according to claim 2, characterized in that: The latch mechanism comprises a fixing plate (9) mounted on both sides of the top of the sealing bottom plate (7) and grooves (10) provided on both sides of the sealing cylinder (8); a pull rod (11) is movably connected inside the fixing plate (9); one end of the pull rod (11) extends into the inside of the groove (10); the other end of the pull rod (11) passes through the other side of the fixing plate (9) and is fixedly connected to a pull plate (12); a return spring (13) is provided on the outer surface of the pull rod (11) located between the pull plate (12) and the fixing plate (9).

4. A high-sensitivity piezoelectric acceleration sensor according to claim 3, characterized in that: A positioning groove (14) is provided at the top of the pull rod (11), a positioning pin (15) is provided inside the positioning groove (14), and the top of the positioning pin (15) extends to the top of the fixing plate (9).

5. The high-sensitivity piezoelectric acceleration sensor according to claim 3, characterized in that: An anti-slip sleeve is fixedly connected to the outer surface of the pull plate (12).

6. The high-sensitivity piezoelectric acceleration sensor according to claim 1, characterized in that: The sensor core (4) adopts a ceramic shear structure.

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