CN212300699U - Integrated miniature pore pressure sensor - Google Patents
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- CN212300699U CN212300699U CN202021976418.3U CN202021976418U CN212300699U CN 212300699 U CN212300699 U CN 212300699U CN 202021976418 U CN202021976418 U CN 202021976418U CN 212300699 U CN212300699 U CN 212300699U
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Abstract
The utility model discloses a miniature hole of integral type pressure sensor. In the sensor: a filter mounting notch, an induction element mounting groove and an air duct are sequentially arranged in the main shell along the axis direction, the porous filter is mounted in the filter mounting groove, the induction element is mounted in the induction element mounting groove, and a sensor cable at the tail end of the induction element extends out of the main shell through the air duct to be connected with the air duct; the sensing element comprises an annular packaging shell, a piezoresistive core, a positioning plate and a sensor cable, wherein the positioning plate and the annular packaging shell form a concave core mounting groove, and the piezoresistive core is arranged on the positioning plate; the concave core body mounting groove is filled and coated with stress-free glue; the place where the induction element mounting groove is connected with the ventilation pipeline forms a step surface for axially positioning the induction element; the induction element is fixedly connected with the induction element mounting groove through an adhesive. The micro pore pressure sensor is applicable to geotechnical centrifugal tests, and has the advantages of low failure rate, high stability and strong anti-interference performance.
Description
Technical Field
The utility model relates to a geotechnical test sensor technical field, in particular to miniature hole of integral type presses sensor.
Background
Geotechnical centrifugal test: the stress loss of soil bodies or rock-soil structures at each position of the centrifugal model is compensated by means of the geotechnical centrifuge, and the stress level close to or equal to that of the prototype is achieved. When the over-compression dynamic load is applied, the actual prototype dynamic characteristics and the failure mechanism can be presented more accurately.
Pore water pressure: generally refers to the water pressure of the saturated soil body when the pore medium is filled with water, and is a positive pressure above the atmospheric pressure. The pore water pressure is divided into static pore water pressure and hyperstatic pore water pressure.
Static pore water pressure: the pore water pressure below the static underground water is the static pore water pressure caused by the self weight of the underground water in the foundation soil.
Hyperstatic pore water pressure: under the action of dynamic loads such as seismic waves, blasting, traffic loads and the like, the part of pore water pressure exceeding the static pore water pressure is called super-static pore water pressure.
A pore pressure sensor: the pore pressure sensor is a key measuring sensor for monitoring the hyperstatic pore water pressure increase and dissipation in saturated/unsaturated soil bodies, and can directly reflect the stress state and stability of soil bodies such as geotechnical engineering physical models, geotechnical structures, construction site foundations and the like.
Integral type pore pressure sensor: the pore pressure sensor main shell is an integral part, and the porous filter at the front end of the sensor is not freely detachable.
A porous filter: the sensor is used for separating soil particles from pore fluid, so that the pore fluid freely enters and exits the sensor and acts on the sensor sensing element, and further the pressure of the pore fluid is changed.
In the field of geotechnical seismic engineering, accurate measurement of pore water pressure is an important research direction of engineering tests, and can directly reflect the catastrophe processes of soil softening and liquefaction in field foundation, geotechnical structures and geotechnical model tests. Due to the fact that the special structures of the porous filter, the ventilation cable and the like of the integrated micro pore pressure sensor are different from those of the conventional pressure sensor, the testing accuracy of the integrated micro pore pressure sensor is affected by various factors. More importantly, different from a conventional vibration table and a field in-situ test, in the geotechnical centrifugal test, the stress loss borne by a soil body is compensated under the environment of N times of high centrifugal acceleration, when the super-compression dynamic load (the frequency is dozens of to hundreds of Hz, and the load duration is less than 1s) is applied, the super-static pore water pressure in the soil body is rapidly increased in an 'instant' manner along with the vibration acceleration, and the integral micro pore pressure sensor is usually required to have the characteristics of high frequency response, good stability, low failure rate, strong anti-interference capability and the like in the geotechnical centrifugal test so as to ensure the accuracy and reliability of the test result of the test, and further illustrate the importance of the integral micro pore pressure sensor with excellent performance to the geotechnical test.
Before 2010, an international standard pore water pressure sensor PDCR-81 is an integrated miniature pore pressure sensor with high precision, high frequency response and high stability widely used in geotechnical centrifugal tests at home and abroad, and is considered as a standard sensor for measuring the pore water pressure in the geotechnical centrifugal tests. However, due to the fact that PDCR-81 is sold in a small amount compared with other sensors of the Druck company, the PDCR-81 integrated micro pore pressure sensor is declared to be stopped by the Druck company in the UK 2010, and a global geotechnical test unit loses the main source of the high-precision and high-frequency response integrated pore pressure sensor. As the inventory loss of PDCR-81 integral pore pressure sensors currently in various geotechnical research units has been exhausted for the past 10 years, the need to develop alternative PDCR-81 integral pore pressure sensors has increased.
In recent years, the integrated pore pressure sensor developed by various domestic manufacturers has the defects in the aspects of self structural design, packaging, waterproof structure and the like, so that the sensor has the problems of low frequency response performance, low measurement precision, high failure rate, poor stability, poor anti-interference performance and the like, and is not suitable for the requirement of high-frequency response and high-precision geotechnical centrifugal test on pore water pressure measurement; the integrated sensor newly developed by foreign manufacturers has high frequency response performance and measurement accuracy, but still has more problems in the aspects of failure rate, anti-interference performance and waterproof performance.
Specifically, the disadvantages of the integrated micro air pressure sensor in the prior art are as follows:
(1) in the aspect of the packaging mode of the inductive element
In the prior art, the sensing elements in the HC-25 integrated pore pressure sensor are all arranged on a circular glass ring in a shell, so that the stress action on two sides of the sensor can be effectively reduced, but fine soil particles and other materials are still doped in pore fluid, the sensing elements of the sensor are directly contacted with the measured pore fluid, and irreversible damage and destruction of the sensing elements are easily caused, which is one of the main reasons for high failure rate of the sensor in the prior art. The KYB integrated pore pressure sensor is formed by modifying a soil pressure sensor, a strain sensing film is packaged on the inner side of a shell pressure sensing surface by using an adhesive, and measurement of pore fluid pressure is realized through deformation deflection of the strain sensing film, but the response speed of the KYB integrated pore pressure sensor is lower than that of an HC-25 sensor, so that the KYB integrated pore pressure sensor cannot adapt to and meet the measurement requirement of a geotechnical centrifugal test.
(2) In the aspect of the installation mode of the porous filter
In the integrated micro pore pressure sensor in HC-25 type, KYB type and the like in the prior art, the porous filter at the front end of the integrated micro pore pressure sensor is directly fixed by a binder, and when the integrated micro pore pressure sensor in the prior art is in a saturated fluid monitoring environment such as a geotechnical centrifugal test, a rock-soil structure, a site foundation and the like for a long time, the porous filter of the sensor is easy to fall off, so that the sensor is easy to break down.
(3) In the aspect of waterproof sealing mode of the sensor
In the prior art, the HC-25 and KYB integrated miniature pore pressure sensor tail waterproof structure is mainly used for being connected with a ventilation cable to achieve waterproof sealing of the cable. However, through a large amount of experimental results, although waterproof construction can play certain sealed effect, but be in for a long time and discover under the high centrifugal acceleration environment in the saturated fluid, sensor ventilation cable is inside easily to accumulate a large amount of steam, and then influences accuracy and the reliability that the miniature pore pressure sensor of integral type surveyed pore pressure data result, more seriously probably leads to steam directly to block up the cable of ventilating, causes the unable normal work of integral type pore pressure sensor.
(4) Cavity-free structural design of sensor
Traditional domestic sensors such as HC-25 among the prior art, KYB integral type miniature pore pressure sensor do not consider sensor cavity structural design (this "cavity" means the utility model provides a be located the cavity clearance between porous filter and the response element), cause impurity such as the small soil particle of the inside pore fluid of soil body, get into the sensor by porous filter inside, probably directly cause the bridging of porous filter and response element, and then lead to response element stress concentration, cause sensor test data bigger than normal, more seriously probably directly cause irreversible damage to response element.
Therefore, the need of developing a novel structure integrated micro pore pressure sensor is urgent, and the sensor can be applicable to high-frequency response and high-precision geotechnical centrifugal test, and has low failure rate, high stability and strong anti-interference performance, and has important practical significance for solving the related 'neck clamp' technical problem.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a novel structure and excellent performance's miniature hole pressure sensor of integral type can be applicable to the geotechnological centrifugal test of high frequency response, high accuracy to the fault rate is low, stability is high, the interference killing feature is strong.
In order to achieve the above object, the utility model provides a following technical scheme:
an integrated micro pore pressure sensor comprising a porous filter, a sensing element, a main housing, and a vent cable, wherein:
a filter mounting notch, an induction element mounting groove and an air duct are sequentially arranged in the main shell along the axis direction, the porous filter is mounted in the filter mounting groove, the induction element is mounted in the induction element mounting groove, and a sensor cable at the tail end of the induction element extends out of the main shell through the air duct to be connected with the air duct;
the sensing element comprises an annular packaging shell, a piezoresistive core, a positioning plate and the sensor cable, the positioning plate is fixedly connected to one end of the annular packaging shell to enable a concave core mounting groove to be formed in the annular packaging shell, the piezoresistive core is located in the concave core mounting groove and arranged on the side face of the positioning plate, the sensor cable is connected with the piezoresistive core and penetrates through the positioning plate to extend into the ventilation pipeline, and a communication hole is formed in the positioning plate;
the concave core body mounting groove is filled and coated with stress-free glue;
the position where the induction element mounting groove is connected with the ventilation pipeline forms a step surface for axially positioning the induction element;
the side surface of the positioning plate, which is far away from the annular packaging shell, is fixedly connected with the step surface through a binder, and/or the outer wall of the annular packaging shell is fixedly connected with the induction element mounting groove through a binder.
Optionally, in the above integrated micro pore pressure sensor, the through hole in the sensing element mounting groove is a first stepped hole, and in the first stepped hole:
the hole section close to the porous filter is a first hole section matched with the annular packaging shell;
the hole section close to the vent pipe is a second hole section matched with the positioning plate;
the first pore section has a pore size smaller than the pore size of the second pore section.
Optionally, in the above integrated micro pore pressure sensor, a spacing groove is provided between the filter mounting groove and the sensing element mounting groove, which protrudes inward, wherein:
the pore diameter of the spacing groove is smaller than the diameter of the end part of the porous filter so as to axially limit the porous filter;
and a cavity structure with the thickness of 0.1mm to 0.5mm is formed between the annular inner wall surface of the spacing groove and the porous filter and the induction element which are positioned at two sides of the spacing groove.
Optionally, in the above integrated micro pore pressure sensor, an aperture of the spacing groove is smaller than an aperture of the first pore section.
Optionally, in the above integrated micro pore pressure sensor, the filter mounting groove is provided with: the filter comprises an end opening (040) matched with the shape of the porous filter, a sealing ring positioning groove matched with the positioning sealing ring, and a filter glue sealing groove used for filling sealing grease.
Optionally, in the above integrated micro pore pressure sensor, the aperture of the end opening (040) is D1, the aperture of the seal ring positioning groove is D2, and the aperture of the filter sealing groove is D3, D2 > D3 > D1.
Optionally, in the above integrated micro pore pressure sensor, one end of the porous filter is a cylindrical sidewall structure, the other end of the porous filter is a tapered sidewall structure, the positioning sealing ring is adapted to the cylindrical sidewall structure, and the tapered sidewall structure is located in the filter sealing groove.
Optionally, in the integrated micro pore pressure sensor, the main housing is provided with a barb pagoda head structure for connecting the ventilation cable, a through hole communicated with the ventilation pipeline is arranged in the barb pagoda head structure, and a barb step is arranged outside the barb pagoda head structure.
Optionally, in the above integrated micro pore pressure sensor, a sealing groove for filling sealing grease is provided at an end of the main housing for connecting the vent cable, and the barbed pagoda head structural connection end is located at a bottom of the sealing groove.
Optionally, in the integrated micro pore pressure sensor, the through hole in the air duct is a second stepped hole, a hole section adjacent to the sensing element mounting groove in the second stepped hole is a third hole section, a hole section connected to the barb pagoda head structure is a fourth hole section, and an aperture of the third hole section is larger than an aperture of the fourth hole section.
According to the above technical scheme, the utility model provides an among the miniature hole pressure sensor of integral type, realized sensor chip level encapsulation through unstressed glue and binder, realized device level encapsulation through the main casing body, the sensor has wholly realized carrying out processing such as electromagnetic shield, electrical insulation, side stress isolation, thermal isolation to the response element in the sensor. Moreover, the annular packaging shell can protect the piezoresistive core body from the stress action of the two sides of the sensor to the maximum extent, and the piezoresistive core body is ensured to work normally; the stress-free adhesive can directly avoid direct contact between the sensing element and pore fluid, thereby effectively preventing impurities such as fine particles in saturated fluid from damaging the sensing element and greatly reducing the failure rate of the sensor. Therefore, the utility model provides a miniature hole pressure sensor of integral type has higher long-term stability and interference killing feature, can be applicable to high frequency response, the geotechnique centrifugal test of high accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an isometric view of a first exploded structure of an integrated micro pore pressure sensor according to an embodiment of the present invention;
fig. 2 is an isometric view of a second exploded structure of an integrated micro pore pressure sensor according to an embodiment of the present invention;
fig. 3 is an isometric view of a first overall structure of an integrated micro pore pressure sensor according to an embodiment of the present invention;
fig. 4 is an isometric view of a second overall structure of an integrated micro pore pressure sensor according to an embodiment of the present invention;
fig. 5 is a front view of an integrated micro pore pressure sensor according to an embodiment of the present invention;
fig. 6 is a cross-sectional view of an integrated micro pore pressure sensor according to an embodiment of the present invention;
fig. 7 is an isometric view of a porous filter provided in accordance with an embodiment of the present invention;
fig. 8 is a side view of a porous filter provided in an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a seal ring according to an embodiment of the present invention;
fig. 10 is a first isometric view of an inductive element provided by an embodiment of the present invention;
fig. 11 is a second isometric view of an inductive element provided in accordance with an embodiment of the present invention;
fig. 12 is a first perspective isometric view of a main housing with a barbed pagoda head structure according to an embodiment of the present invention;
fig. 13 is a second perspective isometric view of the main housing with a barbed pagoda head construction according to an embodiment of the present invention;
fig. 14 is a cross-sectional view of the main housing with a barbed pagoda head structure according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a ventilation cable according to an embodiment of the present invention.
Wherein:
01-porous filter, 02-positioning sealing ring, 03-induction element, 04-stainless steel main shell,
05-barb pagoda head construction, 06-vent cable;
011-the sides of the porous filter, 012-the trapezoidal end faces of the porous filter;
031-annular packaging shell, 032-piezoresistive core, 033-concave core mounting groove,
034-positioning plate, 035-sensor cable, 036-vent hole;
040-opening end, 041-locating slot of sealing ring, 042-sealing slot of filter,
043-sensor cavity structure, 044-sensing element mounting groove, 045-venting tube,
046-sealing the groove;
051-barb step.
Detailed Description
The utility model discloses a novel structure and excellent performance's miniature hole pressure sensor of integral type can be applicable to high frequency response, the geotechnique centrifugal test of high accuracy to the fault rate is low, stability is high, interference killing feature is strong.
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.
Referring to fig. 1 to 15, fig. 1 is an isometric view of a first decomposition structure of an integrated micro pore pressure sensor according to an embodiment of the present invention; fig. 2 is an isometric view of a second exploded structure of an integrated micro pore pressure sensor according to an embodiment of the present invention; fig. 3 is an isometric view of a first overall structure of an integrated micro pore pressure sensor according to an embodiment of the present invention; fig. 4 is an isometric view of a second overall structure of an integrated micro pore pressure sensor according to an embodiment of the present invention; fig. 5 is a front view of an integrated micro pore pressure sensor according to an embodiment of the present invention; fig. 6 is a cross-sectional view of an integrated micro pore pressure sensor according to an embodiment of the present invention; fig. 7 is an isometric view of a porous filter provided in accordance with an embodiment of the present invention; fig. 8 is a side view of a porous filter provided in an embodiment of the present invention; fig. 9 is a schematic structural diagram of a seal ring according to an embodiment of the present invention; fig. 10 is a first isometric view of an inductive element provided by an embodiment of the present invention; fig. 11 is a second isometric view of an inductive element provided in accordance with an embodiment of the present invention; fig. 12 is a first perspective isometric view of a main housing with a barbed pagoda head structure according to an embodiment of the present invention; fig. 13 is a second perspective isometric view of the main housing with a barbed pagoda head construction according to an embodiment of the present invention; fig. 14 is a cross-sectional view of the main housing with a barbed pagoda head structure according to an embodiment of the present invention; fig. 15 is a schematic structural diagram of a ventilation cable according to an embodiment of the present invention.
The embodiment of the utility model provides a novel structure and excellent performance's miniature hole of integral type pressure sensor (also can be called "miniature hole of integral type pressure sensor", or simply "sensor"). The integrated micro pore pressure sensor comprises a porous filter 01, a sensing element 03, a main shell 04, a ventilation cable 06, a positioning sealing ring 02 and a barb pagoda head structure 05.
Specifically, in the above-mentioned integral type miniature pore pressure sensor, set gradually filter installation notch, inductive element mounting groove 044 and breather pipe 045 along the axis direction in the main casing body 04, porous filter 01 installs in the filter mounting groove, and inductive element 03 installs in inductive element mounting groove 044, and the sensor cable 035 at the inductive element 03 tail end stretches out outside the main casing body 04 through breather pipe 045 to be connected with breather cable 06.
Specifically, in above-mentioned miniature hole pressure sensor of integral type, sensing element 03 includes annular encapsulation casing 031, piezoresistive core 032, locating plate 034 and sensor cable 035, locating plate 034 links firmly and sets up in the one end of annular encapsulation casing 031 so that constitute concave core mounting groove 033 in the annular encapsulation casing 031, piezoresistive core 032 is located concave core mounting groove 033 and sets up on the side of locating plate 034, sensor cable 035 is connected with piezoresistive core 032 and passes in locating plate 034 stretches into vent pipe 045, be provided with intercommunicating pore 036 on locating plate 034.
Wherein:
the annular packaging shell 031 is used to protect the piezoresistive core 032 from the stress on both sides of the sensor, and ensure that the piezoresistive core 032 can work normally;
the piezoresistive core 032 mainly senses the pressure value of pore fluid in a measured saturated/unsaturated soil body, forms a Wheatstone bridge circuit by internally arranging four equivalent diffused silicon resistors, and converts the pressure value of the pore fluid into voltage variation and outputs the voltage variation;
the concave core body mounting groove 033 is windowed on the front side, and the stress-free glue is filled and coated inside the concave core body mounting groove 033 and serves as an edge isolation protective layer of the piezoresistive core body 032, so that impurities such as small soil particles in pore fluid inside a soil body are prevented from directly acting on the piezoresistive core body 032 to cause irreversible damage to the piezoresistive core body 032;
the induction element mounting groove 044 is used for mounting and positioning the induction element 03 and preventing the induction element 03 from changing in position, wherein a step surface 0441 for axially positioning the induction element 03 is formed at the position where the induction element mounting groove 044 is connected with the ventilation pipeline 045;
the side surface of the positioning plate 034, which is far away from the annular packaging shell 031, is fixedly connected with the step surface 0441 through an adhesive to fix the sensing element 03, and/or the outer wall of the annular packaging shell 031 is fixedly connected with the sensing element mounting groove 044 through an adhesive to fix the sensing element 03;
the effect of intercommunicating pore 036 and vent pipe 045 can make piezoresistive core 032 communicate external atmospheric pressure mainly for the sensor uses atmospheric pressure as reference, measures external pressure variation, and the sensor normally works that intercommunicating pore 036 and vent pipe 045 can not block up.
According to the technical scheme, the embodiment of the utility model provides an among the miniature hole pressure sensor of integral type, realized sensor chip level encapsulation through unstressed glue and binder, realized device level encapsulation through main casing body 04, the sensor has wholly realized carrying out processing such as electromagnetic shield, electrical insulation, side stress isolation, thermal isolation to the response element 03 in the sensor. Moreover, the annular packaging shell 031 can protect the piezoresistive core 032 from the stress on both sides of the sensor to the greatest extent, so as to ensure that the piezoresistive core 032 works normally; the stress-free adhesive can directly avoid direct contact between the sensing element 03 and pore fluid, thereby effectively preventing impurities such as fine particles in saturated fluid from damaging the sensing element 03 and greatly reducing the failure rate of the sensor. Therefore, the embodiment of the utility model provides a miniature hole pressure sensor of above-mentioned integral type has higher long-term stability and interference killing feature, can be applicable to high frequency response, the geotechnological centrifugal test of high accuracy.
Specifically, the main housing 04 is a stainless steel housing. The ventilation cable 06 is made of silica gel wires, has the characteristics of good pressure resistance, wear resistance, corrosion resistance and the like, is used for protecting the sensor cable 035, and cannot be blocked when the sensor works. See in particular fig. 11 to 14.
Preferably, in the inductive element 03, the diameter of the annular packaging housing 031 is smaller than the diameter of the positioning plate 034. Thus, correspondingly, the through hole in the sensing element mounting groove 044 is a first step hole, in the first step hole: the hole section close to the porous filter 01 is a first hole section matched with the annular packaging shell 031; the hole section close to the ventilation pipeline 045 is a second hole section matched with the positioning plate 034, and the aperture of the first hole section is smaller than that of the second hole section.
Specifically, the sensing element 03 is mounted in the sensing element mounting groove 044 by means of electron beam welding during the production process.
In order to further optimize the above technical solution, in the above integrated micro pore pressure sensor, a spacing groove 043 is provided between the filter mounting notch and the sensing element mounting groove 044 in an inward protruding manner, as shown in fig. 6 and 14. Wherein:
the aperture of the spacing groove 043 is smaller than the diameter of the end part of the porous filter 01 so as to axially limit the porous filter 01;
a cavity structure a with the thickness of 0.1mm to 0.5mm is formed between the annular inner wall surface of the interval groove 043 and the porous filter 01 and the induction element 03 which are positioned at two sides of the interval groove 043. Typically, the concave core mounting groove 033 is filled with an unstressed glue, that is, a cavity structure a having a thickness of 0.1mm to 0.5mm is maintained between the unstressed glue and the porous filter 01. That is, the gap distance between the porous filter and the inductive element is controlled to be within 0.5mm, preferably 0.1mm to 0.5 mm.
In the using process, the porous filter 01 separates soil particles from pore fluid, so that the pore fluid in the soil body can freely enter and exit the cavity structure a, and further acts on the sensing element 03.
Through the design of the cavity structure, the induction element 03 can be ensured not to be stressed on two sides of the sensor to the greatest extent, and the induction element 03 is directly prevented from contacting with pore fluid, so that the induction element 03 is effectively prevented from being damaged by impurities such as fine particles in saturated fluid. That is to say, the cavity structure design can effectively prevent impurities such as tiny soil particles of pore fluid in the soil body from causing bridging between the porous filter 01 and the sensing element 03, and effectively protect the sensing element 03 of the sensor. (in the prior art, the integrated micro pore pressure sensor is not provided with the cavity structure, so that impurities such as micro soil particles of pore fluid in a soil body are easy to cause bridging between the porous filter and the sensing element, and further cause a stress concentration phenomenon, and the measurement data of the sensor has larger deviation from the true situation.)
Specifically, the aperture of the spacing groove 043 is smaller than the aperture of the first hole section of the sensing element mounting groove 044, so that the sensing element 03 can be axially limited.
In a specific embodiment, in the filter installation notch of the integrated micro pore pressure sensor, there are sequentially arranged along the axial direction: an end opening 040 shaped to fit the porous filter 01, a seal ring positioning groove 041 fitted to a positioning seal ring 02 (e.g., an "O-ring"), a filter mastic groove 042 for filling with sealing grease. The aperture of the end opening 040 is D1, the aperture of the sealing ring positioning groove 041 is D2, the aperture of the filter glue sealing groove 042 is D3, and D2 is larger than D3 and is larger than D1.
Thus, when the porous filter 01 is mounted in the filter mounting notch: the end opening 040 can circumferentially position the porous filter 01 and prevent the porous filter from shaking; the positioning sealing ring 02 is arranged in the sealing ring positioning groove 041, and plays a role in positioning and sealing the porous filter 01; the filter sealing groove 042 is filled with sealing grease (also referred to as sealant), and the sealing grease is in sufficient contact with an end portion (specifically, the tapered sidewall structure 012, which will be described later) of the porous filter 01, so as to further achieve sealing between the main housing 04 and the porous filter 01, and fix the porous filter 01.
It can be seen that, in the integrated micro pore pressure sensor, the sealing ring positioning groove 041 and the positioning sealing ring 02 are arranged, and the porous filter can be effectively prevented from falling off due to the fact that the sensor is in saturated fluid for a long time through the matching of the filter glue sealing groove 042 and the sealing glue.
Specifically, the positioning seal ring 02 is made of fluorine rubber, has the characteristics of good high temperature resistance, high pressure resistance, water and oil resistance, strong corrosion resistance and the like, and has the main function of being matched with the side surface 011 of the porous filter to position and fix the porous filter 01, as shown in fig. 9.
Specifically, before geotechnical tests are carried out, the integrated micro pore pressure sensor can select a proper porous filter 01 according to the permeability of different soil body types of field test tests or geotechnical physical model tests, the configurable porous filter 01 of the integrated micro pore pressure sensor mainly comprises a stainless steel sintered filter, a fine calcined bronze filter and a porous ceramic filter, and the filtering particle size range can be selected to be 20-0.2 mm.
Preferably, as shown in fig. 7 and 8: one end of the porous filter 01 is a cylindrical side wall structure 011, the other end is a conical side wall structure 012, the positioning sealing ring 02 is matched with the cylindrical side wall structure 011, and the conical side wall structure 012 is positioned in the filter glue sealing groove 042. The filter is glued the inslot and is filled sealed fat and toper lateral wall structure 012 bonding fixedly, is favorable to enlarging the contact and glues the sealed area to further play the effect of fixed porous filter, when guaranteeing that this miniature pore pressure sensor of integral type is in saturated fluids long-term monitoring environment such as geotechnique centrifugal test, ground structures, place ground, porous filter is difficult not hard up and drops, reduces the fault rate of miniature pore pressure sensor of integral type.
Referring to fig. 6 and fig. 12 to 14, in order to further optimize the above technical solution, in the above integrated micro pore pressure sensor, a barb pagoda head structure 05 for connecting the vent cable 06 is disposed on the main housing 04, a through hole communicated with the vent pipe 045 is disposed in the barb pagoda head structure 05, and a barb step 051 is disposed outside the barb pagoda head structure 05. The outer diameter of the end part of the ventilating cable 06 connected with the barb pagoda head structure 05 is larger, and the inner through hole of the ventilating cable is matched with the barb pagoda head structure 05 and is tightly connected with the barb pagoda head structure.
Referring to fig. 2, 6, 12 to 14, in an embodiment, a sealing groove 046 is provided at an end of the main housing 04 for connecting the vent cable 06, and the barbed pagoda head structure 05 connecting end is located at a bottom of the sealing groove 046. The sealing groove 046 is used for filling sealing grease to seal the joint of the main housing 04 and the vent cable 06. This waterproof construction that sealed recess 046, barb pagoda head structure 05 and sealed fat constitute, its main function is connected the sensor main casing body with the air cable to play waterproof, sealed cable's effect. Wherein, barb pagoda head structure 05 is used for further closely cooperating with the cable 06 of ventilating, ensures that the sensor is inside can not intake, and ensures that vent pipe 045 communicates with atmospheric pressure mutually.
Therefore, in the integrated micro pore pressure sensor, the brand-new waterproof sealing structure with the barb pagoda head structure matched with the sealing grease is adopted, so that the sealing performance of the sensor cable can be effectively improved, and the integrated micro pore pressure sensor is better suitable for the long-term monitoring requirement of saturated fluid in a geotechnical centrifugal test.
Specifically, in the integrated micro pore pressure sensor, the through hole in the ventilation pipe 045 is a second step hole. In this second step hole, the hole section adjacent to sensing element mounting groove 044 is the third hole section, and the hole section that meets with barb pagoda head structure 05 is the fourth hole section, and the aperture of third hole section is greater than the aperture of fourth hole section.
Furthermore, the embodiment of the utility model provides a concrete application step of the miniature hole pressure sensor of integral type as follows:
(1) and (3) placing the integrated micro pore pressure sensor in 95% alcohol for soaking for 2 h. And then, taking out the integrated micro pore pressure sensor, placing the integrated micro pore pressure sensor in heated 100 ℃ airless water, boiling and cleaning for 5min until no bubbles emerge from the surface of a porous filter of the integrated micro pore pressure sensor, and repeating the steps for 3-5 times to finish the cleaning work of the integrated micro pore pressure sensor.
(2) Placing the cleaned integrated micro pore pressure sensor in a vacuum saturation tank, slowly injecting saturated fluid without air water, vacuumizing and saturating for 1.0h, opening the saturation tank and properly stirring to facilitate bubble discharge in water, vacuumizing and saturating for 0.5h again, and repeating the steps for 8-10 times to complete the saturation process of the porous filter in the integrated micro pore pressure sensor.
(3) The integrated micro pore pressure sensor is placed in a calibration device, a sensor ventilating cable is connected with a data acquisition instrument, and various performance indexes (static performance: parameters such as sensitivity, static correlation coefficient and linearity, and dynamic performance: parameters such as response time, frequency response rate and dynamic correlation coefficient) of the sensor are calibrated according to related national standards and industrial specifications, namely a pressure sensor performance test method (GB/T15478-2015) and an geotechnical centrifugal model test technical specification (DL/T5102-2013).
(4) And taking out the calibrated integrated micro pore pressure sensor from the calibration device, and placing the integrated micro pore pressure sensor in saturated fluid for soaking until the sensor needs to be arranged in the geotechnical test, and smearing a layer of vaseline on the surface of the porous filter of the integrated micro pore pressure sensor so as to prevent the porous filter from contacting with air.
To sum up, the embodiment of the utility model provides a miniature hole pressure sensor of integral type has following advantage:
(1) packaging mode of the sensing element:
the integrated micro pore pressure sensor provided by the embodiment of the utility model is an integrated soil test integrated micro pore pressure sensor, and the internal sensing element is arranged inside the annular packaging shell, so that the stress action on two sides of the sensor can be effectively reduced;
the stress-free glue is filled and coated inside the concave core body installation groove of the induction element to serve as an insulation isolation protective layer, so that the irreversible damage to the piezoresistive core body caused by the fact that impurities such as tiny soil particles in pore fluid inside a soil body directly act on the piezoresistive core body can be effectively avoided.
Furthermore, through the annular packaging shell and the filling and coating of the stress-free glue, the sensor sensing element is protected doubly, so that compared with the packaging mode of the traditional sensor, the piezoresistive core can reduce strong and weak electromagnetic interference and two-side stress action to the maximum extent, the thermal isolation and the electrical insulation strength are improved, various severe working environments such as geotechnical centrifugal tests are adapted, and the failure rate and the damage of the integrated integral type micro pore pressure sensor are reduced.
(2) Installation mode of the porous filter:
in the integrated micro pore pressure sensor provided by the embodiment of the utility model, the porous filter is provided with the O-shaped sealing ring through the sealing ring positioning groove, and the position of the porous filter is positioned through the O-shaped sealing ring; through the mode that the filter glues the seal groove and fills sealed fat, fully bond with the toper lateral wall structure of porous filter tip to enlarged the contact and glued the seal area, further played the effect of fixed porous filter, when guaranteeing that this miniature pore pressure sensor of integral type is in saturated fluids such as geotechnological centrifugal test, ground structures, place ground long-term monitoring environment, the difficult not hard up and drop of porous filter, reduced the fault rate of the miniature pore pressure sensor of integral type.
(3) Sensor waterproof sealing mode:
in the integrated micro pore pressure sensor provided by the embodiment of the utility model, one end of the main shell is provided with a sealing groove for filling sealing grease and further sealing the ventilating cable; further, closely cooperate with the vent cable through barb pagoda head structure, guarantee that the sensor is inside can not advance steam and accumulation drop of water to ensure that vent pipe communicates with atmospheric pressure mutually, make the sensor normally work. The sealing groove, the sealing grease and the barb pagoda head structure are combined, and the ventilating cable can have good waterproof sealing and pressure bearing effects. And through a large amount of experimental results, prove the utility model provides a waterproof construction compares the waterproof construction in traditional sensor and has better waterproof sealing effect, when being in the saturated soil body under geotechnological centrifugal test's the high centrifugal acceleration environment for a long time, and the sensor cable of ventilating is inside not to discover the steam accumulation, has ensured the accuracy and the reliability of the miniature pore pressure sensor of integral type measurationing pore water pressure value.
(4) Sensor cavity structural design:
the embodiment of the present invention provides an integrated micro pore pressure sensor, in which a cavity structure (i.e. a cavity structure a between the porous filter 01 and the sensing element 03 shown in fig. 6) is designed. When impurities such as tiny soil particles of pore fluid in the soil body enter the sensor from the porous filter, the existence of the cavity structure can avoid the stress concentration phenomenon caused by the bridging between the porous filter and the induction element due to the tiny soil particles so as to avoid the damage of the sensor. However, considering that the frequency response rate of the sensor is proportional to the size of the cavity structure, the cavity structure should not be too large, and the cavity is too large and is easy to accumulate a large amount of bubbles, thereby causing the frequency response lag and amplitude attenuation of the sensor, therefore, the embodiment of the present invention provides an integrated micro pore pressure sensor in which the thickness of the cavity structure (i.e. the gap distance between the porous filter and the sensing element) is controlled within 0.5 mm.
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, method, 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, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, 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 (10)
1. An integrated micro pore pressure sensor, characterized in that it comprises a porous filter (01), a sensing element (03), a main housing (04) and a vent cable (06), wherein:
a filter mounting notch, an induction element mounting groove (044) and a ventilation pipeline (045) are sequentially arranged in the main shell (04) along the axis direction, the porous filter (01) is mounted in the filter mounting groove, the induction element (03) is mounted in the induction element mounting groove (044), and a sensor cable (035) at the tail end of the induction element (03) extends out of the main shell (04) through the ventilation pipeline (045) to be connected with the ventilation cable (06);
the sensing element (03) comprises an annular packaging shell (031), a piezoresistive core body (032), a positioning plate (034) and a sensor cable (035), wherein the positioning plate (034) is fixedly connected to one end of the annular packaging shell (031) to form a concave core body mounting groove (033) in the annular packaging shell (031), the piezoresistive core body (032) is located in the concave core body mounting groove (033) and arranged on the side surface of the positioning plate (034), the sensor cable (035) is connected with the piezoresistive core body (032) and penetrates through the positioning plate (034) to extend into the ventilation pipeline (045), and a communication hole (036) is formed in the positioning plate (034);
stress-free glue is filled and smeared in the concave core body mounting groove (033);
the place where the induction element mounting groove (044) is connected with the ventilation pipeline (045) forms a step surface (0441) for axially positioning the induction element (03);
the side face, far away from the annular packaging shell (031), of the positioning plate (034) is fixedly connected with the step face (0441) through an adhesive, and/or the outer wall of the annular packaging shell (031) is fixedly connected with the induction element mounting groove (044) through an adhesive.
2. The integrated micro pore pressure sensor according to claim 1, wherein the through hole in the sensing element mounting groove (044) is a first stepped hole in which:
the hole section close to the porous filter (01) is a first hole section matched with the annular packaging shell (031);
the hole section close to the ventilation pipeline (045) is a second hole section matched with the positioning plate (034);
the first pore section has a pore size smaller than the pore size of the second pore section.
3. The integrated micro pore pressure sensor according to claim 2, wherein a spacing groove (043) is provided protruding inward between the filter mounting notch and the sensing element mounting groove (044), wherein:
the pore size of the spacing groove (043) is smaller than the diameter of the end part of the porous filter (01) so as to axially limit the porous filter (01);
a cavity structure with the thickness of 0.1mm to 0.5mm is formed between the annular inner wall surface of the spacing groove (043) and the porous filter (01) and the induction element (03) which are positioned at two sides of the spacing groove (043).
4. The integrated micro pore pressure sensor according to claim 3, wherein the aperture of the spacing groove (043) is smaller than the aperture of the first pore section.
5. The integrated micro pore pressure sensor according to claim 1, wherein the filter mounting groove is internally provided with: the filter comprises an end opening (040) matched with the shape of the porous filter (01), a sealing ring positioning groove (041) matched with the positioning sealing ring (02), and a filter glue sealing groove (042) used for filling sealing grease.
6. The integrated micro pore pressure sensor according to claim 5, wherein the pore size of the end opening (040) is D1, the pore size of the sealing ring positioning groove (041) is D2, and the pore size of the filter glue groove (042) is D3, D2 > D3 > D1.
7. The integrated micro pore pressure sensor according to claim 5, wherein one end of the porous filter (01) is a cylindrical side wall structure (011), the other end is a tapered side wall structure (012), the positioning sealing ring (02) is matched with the cylindrical side wall structure (011), and the tapered side wall structure (012) is positioned in the filter sealing groove (042).
8. The integrated micro pore pressure sensor according to claim 1, wherein a barb pagoda head structure (05) for connecting the vent cable (06) is arranged on the main shell (04), a through hole communicated with the vent pipeline (045) is arranged in the barb pagoda head structure (05), and a barb step (051) is arranged outside the barb pagoda head structure (05).
9. The integrated micro pore pressure sensor according to claim 8, wherein the end of the main housing (04) for connecting the vent cable (06) is provided with a sealing groove (046) for filling sealing grease, and the barb pagoda head structure (05) connecting end is positioned at the bottom of the sealing groove (046).
10. The integrated micro pore pressure sensor according to claim 8, wherein the through hole in the ventilation pipe (045) is a second stepped hole, the hole section adjacent to the sensing element mounting groove (044) in the second stepped hole is a third hole section, the hole section connected with the barbed pagoda head structure (05) is a fourth hole section, and the hole diameter of the third hole section is larger than that of the fourth hole section.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113483942A (en) * | 2021-07-01 | 2021-10-08 | 南京特敏传感技术有限公司 | Multipurpose integral type pressure sensing core |
| US11408803B2 (en) * | 2015-09-22 | 2022-08-09 | Wyatt Technology Corporation | Apparatus to measure multiple signals from a liquid sample |
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2020
- 2020-09-10 CN CN202021976418.3U patent/CN212300699U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11408803B2 (en) * | 2015-09-22 | 2022-08-09 | Wyatt Technology Corporation | Apparatus to measure multiple signals from a liquid sample |
| CN113483942A (en) * | 2021-07-01 | 2021-10-08 | 南京特敏传感技术有限公司 | Multipurpose integral type pressure sensing core |
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