CN211504473U - Soil pressure sensor - Google Patents
Soil pressure sensor Download PDFInfo
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- CN211504473U CN211504473U CN202020083793.9U CN202020083793U CN211504473U CN 211504473 U CN211504473 U CN 211504473U CN 202020083793 U CN202020083793 U CN 202020083793U CN 211504473 U CN211504473 U CN 211504473U
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- pressure sensor
- soil pressure
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Abstract
An embodiment of the utility model discloses a soil pressure sensor, this soil pressure sensor includes: the device comprises a shell, a diaphragm, a PVDF piezoelectric film and an output lead; the PVDF piezoelectric film is arranged in the shell and suspended in the filling liquid, one end of the output lead is connected to the PVDF piezoelectric film, and the other end of the output lead extends out of the shell. The soil pressure sensor has wider range and high detection precision.
Description
Technical Field
The utility model relates to a sensor field, concretely relates to soil pressure sensor.
Background
The soil pressure sensor is also called a soil pressure cell, and is mainly used for measuring the pressure change of soil bodies at buried points in soft soil and filling soil and measuring the surface contact pressure of the soil bodies on retaining walls, anti-slide piles and the like. The current soil pressure sensor mainly comprises two types of steel string type soil pressure and resistance strain type soil pressure, wherein the steel string type soil pressure sensor is suitable for static measurement, and the resistance strain type soil pressure is suitable for dynamic and static measurement. The string type earth pressure sensor has the defects that the sensitivity is limited by the size of the pressure box and cannot be used for dynamic testing; the resistance strain type soil pressure sensor has the defects of weak output signal, large long-term creep, incapability of being suitable for static measurement and the like.
Therefore, it is necessary to develop a soil pressure sensor with wider application range and high detection precision.
The information disclosed in this background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a soil pressure sensor, this soil pressure sensor is with the scope wider, detects the precision height.
In order to achieve the above object, according to the utility model provides a soil pressure sensor, this soil pressure sensor includes: the device comprises a shell, a diaphragm, a PVDF piezoelectric film and an output lead;
the PVDF piezoelectric film is arranged in the shell and suspended in the filling liquid, one end of the output lead is connected to the PVDF piezoelectric film, and the other end of the output lead extends out of the shell.
Preferably, the filling liquid is silicone oil.
Preferably, the housing has a rectangular parallelepiped shape, and the PVDF piezoelectric film is disposed along a length direction of the rectangular parallelepiped shape.
Preferably, the housing is provided with a notch, the notch is located on the side wall of the open end of the housing, and the diaphragm is connected to the housing in a nested manner through the notch, covers and seals the opening of the housing.
Preferably, the device further comprises a lead outlet, the lead outlet is arranged at one end, far away from the diaphragm, of the shell, and the output lead extends out of the shell through the lead outlet.
Preferably, a seal is further included, the seal being disposed at the wire exit.
Has the advantages that: the soil pressure sensor is suitable for static soil pressure measurement and dynamic soil pressure measurement, output signals are adjustable, and creep deformation is avoided after long-term use. Through the arrangement of the PVDF piezoelectric film, the piezoelectric film has the characteristics of wide frequency response, large dynamic range, high pressure point conversion sensitivity, good mechanical property, high mechanical strength, impact resistance, long service life and the like.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the soil pressure sensor of the present invention.
Description of reference numerals:
1. a housing; 2. a membrane; 3. PVDF piezoelectric film; 4. a silicone oil; 5. and (4) an output lead.
Detailed Description
The technical scheme of the utility model is described in detail with the accompanying drawings.
According to the utility model discloses an aspect provides a soil pressure sensor, and this soil pressure sensor includes: the device comprises a shell, a diaphragm, a PVDF piezoelectric film and an output lead;
the PVDF piezoelectric film is arranged in the shell and suspended in the filling liquid, one end of the output lead is connected to the PVDF piezoelectric film, and the other end of the output lead extends out of the shell.
The utility model provides a soil pressure sensor buries soil pressure sensor underground under soil during the use, makes the diaphragm be located soil pressure sensor's top. When the soil pressure acts on the diaphragm, the diaphragm deforms to drive the filling liquid in the shell to move, the PVDF piezoelectric film is freely suspended in the true filling liquid and can sense the change in a slight state, and then the PVDF piezoelectric film can send a pressure output signal through the output lead based on the movement of the filling liquid to finish the detection of the soil pressure. The diaphragm of the soil pressure sensor can quickly and accurately sense slight soil pressure change signals, then accurately transmit the signals to the PVDF piezoelectric film, and the cavity of the shell is filled with filling liquid, so that errors in measurement are greatly reduced. The PVDF piezoelectric film has the advantages of large piezoelectric constant, high output sensitivity, wide frequency response, high mechanical strength and the like, and can be used for measuring the soil pressure change in a wide frequency range, namely the soil pressure change in a dynamic environment and a static environment.
Further, the filling liquid is silicone oil.
Specifically, through the arrangement of the silicone oil, when the diaphragm is pressed, the movement of the silicone oil can be sensed by the PVDF piezoelectric film as soon as possible, so that the error in measurement is further reduced, and meanwhile, the PVDF piezoelectric film is convenient to suspend and arrange in the filling liquid.
Further, the casing is cuboid, and the PVDF piezoelectric film is arranged along the length direction of the cuboid.
Specifically, the casing is designed to be cuboid, so that the casing is convenient to produce and process, and the PVDF piezoelectric film is arranged along the length direction of the cuboid, so that the detection area of the PVDF piezoelectric film can be increased.
Furthermore, the shell is provided with a notch, the notch is positioned on the side wall of the open end of the shell, and the diaphragm is connected to the shell in a nested manner through the notch to cover and seal the opening of the shell.
Particularly, through the arrangement of the notch, the installation of the diaphragm is convenient, and the filling liquid in the shell can be prevented from overflowing through the opening of the diaphragm sealing shell.
Furthermore, the device also comprises a lead outlet, wherein the lead outlet is formed in one end, far away from the diaphragm, of the shell, and the output lead extends out of the shell through the lead outlet.
Specifically, through the setting of wire export, be convenient for send out the testing result of PVDF piezoelectric film with the output wire, through setting up the wire export in the one end that the diaphragm was kept away from to the casing, prevent offering of wire export from influencing the measuring result of PVDF piezoelectric film, make soil pressure sensor's measuring result more accurate.
Further, the wire guide device also comprises a sealing member, wherein the sealing member is arranged at the wire outlet.
Specifically, the wire outlet is blocked by the sealing element, so that the filling liquid filled in the cavity can be prevented from overflowing.
Example 1
Fig. 1 is a schematic structural view of an embodiment of the soil pressure sensor of the present invention.
As shown in fig. 1, the soil pressure sensor includes: the device comprises a shell 1, a diaphragm 2, a PVDF piezoelectric film 3 and an output lead 5;
the PVDF piezoelectric film is arranged in the shell 1 and suspended in the filling liquid, one end of the output lead 5 is connected to the PVDF piezoelectric film 3, and the other end of the output lead extends out of the shell 1.
Wherein the filling liquid is silicone oil 4.
The casing 1 is rectangular, and the PVDF piezoelectric film 3 is arranged along the length direction of the rectangular.
The casing 1 is provided with a notch, the notch is positioned on the side wall of the opening end of the casing 1, and the diaphragm 2 is connected to the casing 1 in a nested manner through the notch to cover and seal the opening of the casing 1.
The diaphragm type air conditioner further comprises a lead outlet, wherein the lead outlet is formed in one end, far away from the diaphragm 2, of the shell 1, and the output lead 5 extends out of the shell 1 through the lead outlet.
Wherein, still include the sealing member, the sealing member sets up in the wire exit.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An earth pressure sensor, characterized in that the earth pressure sensor comprises: the device comprises a shell, a diaphragm, a PVDF piezoelectric film and an output lead;
the PVDF piezoelectric film is arranged in the shell and suspended in the filling liquid, one end of the output lead is connected to the PVDF piezoelectric film, and the other end of the output lead extends out of the shell.
2. The soil pressure sensor according to claim 1, wherein the filler fluid is silicone oil.
3. The soil pressure sensor according to claim 1, wherein the housing has a rectangular parallelepiped shape, and the PVDF piezoelectric film is disposed along a length direction of the rectangular parallelepiped shape.
4. The soil pressure sensor of claim 1 wherein the housing defines a notch in a side wall of the open end of the housing, the diaphragm being nestingly connected to the housing through the notch to cover and seal the opening of the housing.
5. The soil pressure sensor of claim 1, further comprising a wire outlet opening at an end of the housing remote from the diaphragm, the output wire extending out of the housing through the wire outlet opening.
6. The soil pressure sensor of claim 5, further comprising a seal disposed at the wire exit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020083793.9U CN211504473U (en) | 2020-01-15 | 2020-01-15 | Soil pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020083793.9U CN211504473U (en) | 2020-01-15 | 2020-01-15 | Soil pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211504473U true CN211504473U (en) | 2020-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020083793.9U Active CN211504473U (en) | 2020-01-15 | 2020-01-15 | Soil pressure sensor |
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| Country | Link |
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| CN (1) | CN211504473U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681179A (en) * | 2020-12-17 | 2021-04-20 | 东南大学 | Pavement structure stress detection and maintenance early warning method based on intelligent particle structure |
-
2020
- 2020-01-15 CN CN202020083793.9U patent/CN211504473U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681179A (en) * | 2020-12-17 | 2021-04-20 | 东南大学 | Pavement structure stress detection and maintenance early warning method based on intelligent particle structure |
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