CN210827408U - Pressure sensitive element and pore water pressure meter - Google Patents
Pressure sensitive element and pore water pressure meter Download PDFInfo
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- CN210827408U CN210827408U CN201921136239.6U CN201921136239U CN210827408U CN 210827408 U CN210827408 U CN 210827408U CN 201921136239 U CN201921136239 U CN 201921136239U CN 210827408 U CN210827408 U CN 210827408U
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Abstract
The utility model discloses a pressure sensing element and pore water gauge, pressure sensing element includes: the PCB conversion circuit board is fixedly arranged in the sensitive element protection shell, and the sensitive core body and the shielding cable are fixedly connected to the PCB conversion circuit board, so that the space occupied by an original large glass support (a glass ring) is saved; because the unstressed glue has thermal-insulated, waterproof sealing etc. effect, consequently use the sensitive core of unstressed glue protection, can realize guaranteeing under the prerequisite that can measure liquid medium pressure, only need less coating contact surface, measurement liquid medium pressure that just can be accurate to can protect sensitive core and avoid side direction exogenic action, thereby need not the casing wall increase with the sensing element protective housing, consequently, the utility model discloses pressure sensing element's size has been reduced greatly, thereby reduced this pressure sensing element's of encapsulation size.
Description
Technical Field
The utility model relates to a technical field is surveyed to the pore pressure, and more specifically the theory that says so relates to a pressure sensing element and pore water gauge.
Background
A pore water pressure meter (pore pressure meter for short) is a key measuring sensor for observing the increase and dissipation of the ultra-static pore water pressure in a soil body, and can be used for monitoring and judging the mechanical state and stability of fields, geotechnical structures and the like. The main body part of the pore water pressure meter mainly comprises a permeable stone, a pressure sensitive element, a protective shell and the like.
At present, a large amount of data statistics shows that in static centrifugal model tests, dynamic centrifugal model tests and conventional vibration table tests, extremely strict requirements are put forward on aspects such as miniaturization, measurement precision, measurement reliability and service life of a pore hydraulic pressure gauge based on special requirements on a measured flow field and accurate acquisition of high-frequency dynamic pressure change rules on a wide frequency band. The pressure sensitive element for pore pressure measurement is used as the most important component of the pore water pressure meter and plays a vital role in the size and the like of the pore water pressure meter.
However, the pressure sensitive element in the prior art has an oversize (diameter is about 18mm, thickness is 6mm), which easily causes the problem that the whole pore water pressure meter after being packaged has a large size, and causes the oversize reason of the pressure sensitive element as follows: 1) the sensitive core body is required to be arranged on a through large glass bracket (glass ring), and then the large glass bracket is welded in the sensitive element protective shell, so that the size of the sensitive element is enlarged; 2) silicone oil is injected into the front end of the sensitive core body, pressure medium is transmitted through the silicone oil, and in order to ensure that the pressure of the liquid medium can be measured, the whole contact surface needs to be enlarged; 3) since the silicon oil cannot protect the sensitive core from the action of lateral external force, in order to protect the internal sensitive core from external interference, the shell wall of the sensitive element protective shell needs to be enlarged. Therefore, in a static centrifugal model test, a dynamic centrifugal model test and a conventional vibration table test, the state of a complex flow field is easily greatly interfered, so that the obtained dynamic change rule of the pore water pressure has certain deviation, and the pore water pressure test requirement of high precision, high sensitivity and accuracy in a multi-field coupling and complex soil body environment is not met. Therefore, how to provide a small-sized pressure sensitive device becomes a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model discloses a sensing element and pore water pressure gauge to realize that the space that big glass bracket occupies is saved through fixedly connecting the sensing core body on the PCB conversion circuit board and making the shielded cable pass through the cable positioning hole of the sensing element protective housing and fixedly connect with the rear end of the PCB conversion circuit board, thereby optimizing the internal space size of the sensing element protective housing; further, compared with the use of silicone oil in the traditional scheme, the utility model uses the stress-free glue to protect the sensitive core, and because the stress-free glue has the functions of heat insulation, waterproof sealing, electrical insulation strength increase and the like, the pressure of the liquid medium can be accurately measured only by a small coating contact surface on the premise of ensuring that the pressure of the liquid medium can be measured, and the sensitive core can be protected from the lateral external force action, so that the shell wall of the protective shell of the sensitive element is not required to be enlarged, therefore, the size of the pressure sensitive element is greatly reduced, the size of the pressure sensitive element is packaged, the static centrifugal model test, the dynamic centrifugal model test and the conventional vibration table test are not easy to cause large interference to the complex flow field state, and the accuracy of the acquired dynamic change rule of the pore water pressure is improved, the requirements of high-precision, high-sensitivity and accurate pore water pressure test in multi-field coupling and complex soil body environments are met.
A pressure sensitive element comprising: the PCB comprises a sensitive core body, a PCB conversion circuit board, a sensitive element protection shell and a shielding cable, wherein the sensitive element protection shell is provided with a glue injection port, a vent hole and a cable positioning hole;
the sensitive core body is fixedly connected with the front end of the PCB conversion circuit board, the shielding cable penetrates through the cable positioning hole and is fixedly connected with the rear end of the PCB conversion circuit board, the shielding cable and the cable positioning hole are fixed in a sealing mode, the whole body formed by the sensitive core body, the PCB conversion circuit board and the shielding cable is placed in the sensitive element protective shell through the glue injection port and is fixed through stress-free glue, and the air vent of the sensitive element protective shell is communicated with the air vent of the sensitive core body.
Optionally, the fixed connection includes: and (6) welding.
Optionally, the sensitive core is fixedly connected to the front end of the PCB conversion circuit board, and specifically includes:
and the gold wire on the sensitive core body is connected with the front welding spot of the PCB conversion circuit board in a welding manner.
Optionally, the non-stress adhesive includes: a silicone rubber elastomer.
Optionally, the sensitive core includes: MEMS piezoresistive pressure sensitive chip.
Optionally, the shielded cable is a silica gel cable.
A pore hydraulic pressure gauge, comprising: the pressure sensitive element described above.
According to the above technical scheme, the utility model discloses a pressure sensing element and pore water pressure meter, pressure sensing element includes: the sensitive core body is fixedly connected with the front end of the PCB, the shielding cable penetrates through a cable positioning hole of the sensitive element protective shell and is fixedly connected with the rear end of the PCB, the whole body formed by the sensitive core body, the PCB and the shielding cable is placed in the sensitive element protective shell through a glue injection port and is fixed through stress-free glue, and an air vent of the sensitive element protective shell is communicated with an air vent of the sensitive core body. The utility model fixedly places a PCB conversion circuit board in the sensitive element protection shell, and saves the space occupied by the original large glass bracket (glass ring) by fixedly connecting the sensitive core body on the PCB conversion circuit board and enabling the shielding cable to pass through the cable positioning hole of the sensitive element protection shell and be fixedly connected with the rear end of the PCB conversion circuit board, thereby optimizing the internal space size of the sensitive element protection shell; further, compared with the use of silicone oil in the traditional scheme, the utility model uses the stress-free glue to protect the sensitive core, and because the stress-free glue has the functions of heat insulation, waterproof sealing, electrical insulation strength increase and the like, the pressure of the liquid medium can be accurately measured only by a small coating contact surface on the premise of ensuring that the pressure of the liquid medium can be measured, and the sensitive core can be protected from the lateral external force action, so that the shell wall of the protective shell of the sensitive element is not required to be enlarged, therefore, the size of the pressure sensitive element is greatly reduced, the size of the pressure sensitive element is packaged, the static centrifugal model test, the dynamic centrifugal model test and the conventional vibration table test are not easy to cause large interference to the complex flow field state, and the accuracy of the acquired dynamic change rule of the pore water pressure is improved, the requirements of high-precision, high-sensitivity and accurate pore water pressure test in multi-field coupling and complex soil body environments are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the disclosed drawings without creative efforts.
Fig. 1 is an exploded view of a pressure sensitive device according to an embodiment of the present invention;
fig. 2(a) is a schematic left side view of a sensor protection case according to an embodiment of the present invention;
fig. 2(b) is a right side view schematically illustrating a sensor protection casing according to an embodiment of the present invention;
fig. 3(a) is a schematic left-side view of an overall structure of a pressure sensitive element according to an embodiment of the present invention;
fig. 3(b) is a schematic diagram of an overall structure of a pressure sensitive element according to an embodiment of the present invention;
fig. 4(a) is a schematic diagram of an internal structure of a pressure sensitive element disclosed in an embodiment of the present invention;
fig. 4(b) is a schematic diagram of an internal structure of another pressure sensitive element disclosed in the embodiment of the present invention;
fig. 5(a) is a side view of a pressure sensitive element disclosed in an embodiment of the present invention;
fig. 5(b) is a sectional view of a pressure sensitive device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model discloses pressure sensing element and pore water gauge, pressure sensing element includes: the sensitive core body is fixedly connected with the front end of the PCB, the shielding cable penetrates through a cable positioning hole of the sensitive element protective shell and is fixedly connected with the rear end of the PCB, the whole body formed by the sensitive core body, the PCB and the shielding cable is placed in the sensitive element protective shell through a glue injection port and is fixed through stress-free glue, and an air vent of the sensitive element protective shell is communicated with an air vent of the sensitive core body. The utility model fixedly places a PCB conversion circuit board in the sensitive element protection shell, and saves the space occupied by the original large glass bracket (glass ring) by fixedly connecting the sensitive core body on the PCB conversion circuit board and enabling the shielding cable to pass through the cable positioning hole of the sensitive element protection shell and be fixedly connected with the rear end of the PCB conversion circuit board, thereby optimizing the internal space size of the sensitive element protection shell; further, compared with the use of silicone oil in the traditional scheme, the utility model uses the stress-free glue to protect the sensitive core, and because the stress-free glue has the functions of heat insulation, waterproof sealing, electrical insulation strength increase and the like, the pressure of the liquid medium can be accurately measured only by a small coating contact surface on the premise of ensuring that the pressure of the liquid medium can be measured, and the sensitive core can be protected from the lateral external force action, so that the shell wall of the protective shell of the sensitive element is not required to be enlarged, therefore, the size of the pressure sensitive element is greatly reduced, the size of the pressure sensitive element is packaged, the static centrifugal model test, the dynamic centrifugal model test and the conventional vibration table test are not easy to cause large interference to the complex flow field state, and the accuracy of the acquired dynamic change rule of the pore water pressure is improved, the requirements of high-precision, high-sensitivity and accurate pore water pressure test in multi-field coupling and complex soil body environments are met.
Referring to fig. 1, an embodiment of the present invention discloses an explosion diagram of a pressure sensitive element, wherein the pressure sensitive element includes: the sensor package comprises a sensor core 01, a PCB (Printed Circuit Board) conversion Circuit Board 02, a sensor protection shell 03 and a shielded cable 04.
Referring to the schematic diagrams of the sensing element protection shell disclosed in fig. 2(a) and 2(b), a glue injection port 031, an air vent 032, and a cable positioning hole 033 are disposed on the sensing element protection shell 03.
The connection relationship of the components of the pressure sensitive element is as follows:
the sensitive core body 01 is fixedly connected with the front end of the PCB conversion circuit board 02, the shielding cable 04 penetrates through a cable positioning hole 033 of the sensitive element protective shell 03 and is fixedly connected with the rear end of the PCB conversion circuit board 02, the shielding cable 04 and the cable positioning hole 033 are fixed in a sealing mode, the whole body formed by the sensitive core body 01, the PCB conversion circuit board 02 and the shielding cable 04 is placed inside the sensitive element protective shell 03 through a glue injection port 031 and is fixed through stress-free glue, and the air vent 032 of the sensitive element protective shell 03 is communicated with the air vent of the sensitive core body 01.
The non-stress adhesive comprises: a silicone rubber elastomer.
The overall structural schematic diagram of the pressure sensitive element can be seen in fig. 3(a) and 3(b), and the internal structural schematic diagram of the pressure sensitive element can be seen in fig. 4(a) and 4 (b).
It should be noted that, in practical application, the fixed connection between the sensitive core 01 and the front end of the PCB 02 includes: the sensitive core 01 is soldered, that is, soldered at the front end of the PCB 02. Specifically, the gold wire on the sensitive core 01 is connected with the front solder joint of the PCB conversion circuit board 02 by welding.
Shielded cable 04 passes through cable locating hole 033 of sensing element protective housing 03, and the rear end fixed connection with PCB conversion circuit board 02 includes: and (3) welding, namely, the shielded cable 04 penetrates through the cable positioning hole 033 of the sensitive element protective shell 03 to be welded at the rear end of the PCB 02.
In this embodiment, the glue injection port 031 functions as: through filling no stress glue, play waterproof sealing, pressure-bearing and isolated external interference factor's effect to sensitive core 01 and PCB converting circuit board 02, external interference factor includes: corrosive liquids, high centrifugal forces, strong/weak electromagnetism, etc.
The non-stress glue in the embodiment adopts a high-performance non-stress glue, and the high performance means that the waterproof performance of the non-stress glue is higher than that of a common non-stress glue, so that the phenomena of cracking, aging and the like of a glue surface of a pressure sensitive element when the pressure sensitive element is soaked in a pressure fluid measuring environment for a long time and the damage to an internal sensitive element can be effectively avoided.
The function of the vent 032 is: and the air hole on the sensitive core body 01 is communicated so as to take the atmosphere as a pressure reference value.
The cable positioning holes 033 function as: play the fixed action to shielded cable 04, specifically do: cable glue is filled between the shielded cable 04 and the cable positioning hole 033 to fix the shielded cable 04.
In practical application, the cable adhesive is high-performance cable adhesive, and the high performance means that the cable adhesive has high waterproof performance, so that the phenomena of cracking, aging and the like of an adhesive surface of a pressure sensitive element which is soaked in a pressure fluid measuring environment for a long time and damage to an internal sensitive element directly can be effectively avoided.
It is found through the comparison that the size of the pressure sensitive element of the utility model discloses a size of pressure sensitive element among the prior art reduces greatly for pressure sensitive element's among the prior art, and the size of pressure sensitive element among the prior art is usually: the diameter of the pressure sensitive element is 13mm, the thickness is 6mm, and the diameter of the shielded cable is 5 mm. Referring to the side view and the sectional view of the pressure sensitive element shown in fig. 5(a) and 5(b), the size of the pressure sensitive element in the present invention can be reduced to: the diameter of the pressure sensitive element is 5.5mm, the thickness of the pressure sensitive element is 4.5mm, the diameter of the shielded cable is 1.2mm, and the size of the air vent of the sensitive core body 01 is also reduced. Obviously, the pressure sensing element disclosed by the utility model has a large scale compared with the whole volume of the pressure sensing element in the prior art, and the scale is about 30%, thereby indirectly reducing the whole size of the pore water pressure gauge after being packaged. Therefore, in a static centrifugal model test, a dynamic centrifugal model test and a conventional vibration table test, the size of the pressure sensitive element suitable for pore pressure measurement is greatly reduced, so that the packaged pore water pressure gauge is not easy to interfere with the state of a tested complex flow field, the accuracy and the reliability of the dynamic change rule of the obtained pore water pressure can be effectively improved, and the requirements of high-precision, high-sensitivity and accurate pore water pressure test in a multi-field coupling and complex soil body environment are met.
In summary, the present invention discloses a pressure sensitive device, including: the sensitive core body 01, the PCB conversion circuit board 02, the sensitive element protective housing 03 and the shielded cable 04, the sensitive core body 01 is fixedly connected with the front end of the PCB conversion circuit board 02, the shielded cable 04 passes through a cable positioning hole 033 of the sensitive element protective housing 03 and is fixedly connected with the rear end of the PCB conversion circuit board 02, the whole body formed by the sensitive core body 01, the PCB conversion circuit board 02 and the shielded cable 04 is placed inside the sensitive element protective housing 03 through a glue injection port 031 and is fixed through stress-free glue, and the vent holes 032 of the sensitive element protective housing 03 are communicated with the vent holes of the sensitive core body 01. The utility model fixedly places a PCB conversion circuit board in the sensitive element protection shell, and saves the space occupied by the original large glass bracket (glass ring) by fixedly connecting the sensitive core body on the PCB conversion circuit board and enabling the shielding cable to pass through the cable positioning hole of the sensitive element protection shell and be fixedly connected with the rear end of the PCB conversion circuit board, thereby optimizing the internal space size of the sensitive element protection shell; further, compared with the use of silicone oil in the traditional scheme, the utility model uses the stress-free glue to protect the sensitive core, and because the stress-free glue has the functions of heat insulation, waterproof sealing, electrical insulation strength increase and the like, the pressure of the liquid medium can be accurately measured only by a small coating contact surface on the premise of ensuring that the pressure of the liquid medium can be measured, and the sensitive core can be protected from the lateral external force action, so that the shell wall of the protective shell of the sensitive element is not required to be enlarged, therefore, the size of the pressure sensitive element is greatly reduced, the size of the pressure sensitive element is packaged, the static centrifugal model test, the dynamic centrifugal model test and the conventional vibration table test are not easy to cause large interference to the complex flow field state, and the accuracy of the acquired dynamic change rule of the pore water pressure is improved, the requirements of high-precision, high-sensitivity and accurate pore water pressure test in multi-field coupling and complex soil body environments are met.
Preferably, the sensitive core 01 in the above embodiments adopts a MEMS (Micro-Electro-mechanical system) piezoresistive pressure sensitive chip, and the core is an imported chip originally installed abroad, and has the characteristics of high long-term stability, high precision, high linearity, long service life and the like in an actual test process. More importantly, the core body has high inherent frequency response (up to 1MHz), which is very important for the accuracy and reliability of the dynamic pore pressure data of the pore water pressure measurement high frequency response.
In conclusion, since the sensitive core 01 adopts the MEMS piezoresistive pressure sensitive chip, the pressure sensitive element to be protected in the present invention has the advantages of high measurement accuracy, high reliability, long service life, etc., and also has long-term stability and high-frequency response performance.
Preferably, shielded cable 04 is the silica gel cable, and the diameter of silica gel cable can be 1.9mm, consequently, the utility model provides a shielded cable 04 actually is small-size shielded cable. The silica gel cable has the advantages of excellent high/low temperature resistance, electrical insulation, chemical stability, aging resistance, long service life, good softness performance, water resistance, pressure resistance and the like. The utility model provides a small-size shielding cable diameter that pressure sensing element adopted compares and has great reduction (reduce about 50%) in the size in the cable that pressure sensing element used in the past to effectively reduced the interference effect of surveying complicated flow field and other sensors in the geotechnique's model in high centrifugal acceleration. And the silica gel cable is high in flexibility and easy to bend, so that the difficulty in laying the pore hydraulic pressure meter can be reduced, and the pressure sensitive element suitable for pore pressure measurement can accurately measure the change condition of pore fluid pressure of a fixed point position.
The utility model also discloses a pore water pressure gauge, this pore water pressure gauge includes the pressure sensing element in the above-mentioned embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A pressure sensitive element, comprising: the PCB comprises a sensitive core body, a PCB conversion circuit board, a sensitive element protection shell and a shielding cable, wherein the sensitive element protection shell is provided with a glue injection port, a vent hole and a cable positioning hole;
the sensitive core body is fixedly connected with the front end of the PCB conversion circuit board, the shielding cable penetrates through the cable positioning hole and is fixedly connected with the rear end of the PCB conversion circuit board, the shielding cable and the cable positioning hole are fixed in a sealing mode, the whole body formed by the sensitive core body, the PCB conversion circuit board and the shielding cable is placed in the sensitive element protective shell through the glue injection port and is fixed through stress-free glue, and the air vent of the sensitive element protective shell is communicated with the air vent of the sensitive core body.
2. The pressure sensitive element of claim 1, wherein the fixed connection comprises: and (6) welding.
3. The pressure sensor of claim 1, wherein the gold wire on the sensor core is soldered to the front side solder joint of the PCB.
4. The pressure sensitive element of claim 1, wherein the non-stressed adhesive comprises: a silicone rubber elastomer.
5. The pressure sensing element of claim 1, wherein the sensing core comprises: MEMS piezoresistive pressure sensitive chip.
6. The pressure sensitive element of claim 1, wherein the shielded cable is a silicone cable.
7. A pore hydraulic pressure gauge, comprising: the pressure sensitive member of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921136239.6U CN210827408U (en) | 2019-07-18 | 2019-07-18 | Pressure sensitive element and pore water pressure meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921136239.6U CN210827408U (en) | 2019-07-18 | 2019-07-18 | Pressure sensitive element and pore water pressure meter |
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| Publication Number | Publication Date |
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| CN210827408U true CN210827408U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921136239.6U Active CN210827408U (en) | 2019-07-18 | 2019-07-18 | Pressure sensitive element and pore water pressure meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241804A (en) * | 2019-07-18 | 2019-09-17 | 中国地震局工程力学研究所 | A kind of pressure-sensing device, packaging method and ventage piezometer |
-
2019
- 2019-07-18 CN CN201921136239.6U patent/CN210827408U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241804A (en) * | 2019-07-18 | 2019-09-17 | 中国地震局工程力学研究所 | A kind of pressure-sensing device, packaging method and ventage piezometer |
| CN110241804B (en) * | 2019-07-18 | 2024-07-12 | 中国地震局工程力学研究所 | Pressure sensitive element, packaging method and pore water pressure gauge |
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