CN108731706B - Sensor - Google Patents
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- CN108731706B CN108731706B CN201810290040.2A CN201810290040A CN108731706B CN 108731706 B CN108731706 B CN 108731706B CN 201810290040 A CN201810290040 A CN 201810290040A CN 108731706 B CN108731706 B CN 108731706B
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- base
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- circuit board
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
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- General Physics & Mathematics (AREA)
- Measuring Leads Or Probes (AREA)
Abstract
The invention relates to a sensor, which comprises a sensor probe and a circuit board on a base for mounting the sensor probe, wherein the circuit board is fixed with the sensor probe through two cuboid copper columns fixed on the base, fixing bolt holes and clamping bolt holes penetrating through the copper columns are formed in the copper columns, the fixing bolt holes are perpendicular to the clamping bolt holes, the copper columns are fixed on fixing holes in the base through fixing bolts in the fixing bolt holes, the two fixing holes are formed in a straight line on the bottom surface of the base, the straight line penetrates through the central axis of the base and is positioned on two sides of the central axis, the clamping bolts are mounted in the clamping bolt holes, nuts are arranged on the clamping bolts, the circuit board is fixed with the copper columns through the clamping bolts and the nuts, and the two copper columns are positioned on. The sensor has the characteristics of eliminating parasitic capacitance and being accurate in measurement.
Description
Technical Field
The invention relates to a sensor, and belongs to the technical field of sensor design and processing.
Background
The sensor probe adopts a cylindrical structure, a complex integrated sensor circuit board is embedded inside the sensor probe, and the connection between the circuit board and the barrel-shaped shell is more complex due to the limitation of space. The circuit board needs to be fixed when in use, and the circuit board is influenced in use in the actual process due to the small fixing surface of the circuit board and the poor performance of the existing fixing device. The circuit board involved in the method needs to collect the temperature of the metal shell, and if the traditional oxide particles are filled between the metal shell and the circuit board, the method can interfere the circuit to collect other capacitance sensor data. The temperature required to be measured in the industrial field requires high precision.
The traditional device (L type angle iron) is fixed on a cylindrical metal base with poor verticality, which affects the precision of an acceleration sensor of a circuit board, because two larger screw heads penetrating through L type angle iron can cause space local interference, the strength of smaller screws is not high, the circuit board is unstable, a single-side fixed circuit board is not beneficial to circuit element layout, in addition, the traditional method for collecting the temperature of the circuit board is a mode of connecting a temperature sensing probe and magnesium oxide particles to fill the space between a temperature sensing chip of the circuit and a metal shell through cables, capacitance deviation of the sensor is inevitably caused, and the temperature sensing precision is not high.
Disclosure of Invention
The invention provides a sensor for measuring accurately, aiming at the problems of instable installation and poor conductivity of a central circuit board in the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a sensor, a serial communication port, circuit board on the base including sensor probe and installation sensor probe, the circuit board fix with the sensor probe through the copper post of two cuboids of fixing on the base, the copper post on be provided with fixing bolt hole and the centre gripping bolt hole that runs through the copper post, the fixing bolt hole is perpendicular with the centre gripping bolt hole, the copper post passes through the fixing bolt downthehole fixing bolt of fixing bolt and fixes on the fixed orifices on the base, two fixing orifices on the base bottom surface one pass on the straight line of base axis and be located the both sides of axis, the centre gripping bolt is installed downthehole at the centre gripping bolt, and be provided with the nut on the centre gripping bolt, the circuit board passes through the centre gripping bolt and the nut is fixed with the copper post.
On the basis of the technical scheme, in order to achieve the convenience of use and the stability of equipment, the invention can also make the following improvements on the technical scheme:
furthermore, one copper column is a long copper column, the other copper column is a short copper column, and heat-conducting silica gel is arranged between the long copper column and the circuit board.
Further, the sensor probe comprises a base with an internal thread middle hole and a sensor body with an external thread at the upper end, the sensor body comprises an insulating shell with an inner cavity, the open end of the insulating shell is provided with an external thread matched with the base, the bottom of the inner cavity of the insulating shell is provided with a probe, the probe comprises a coaxial pole core and a metal shell, one end of the pole core extends out of the metal shell, a T-shaped insulating ring composed of an insulating ring seat and an insulating ring body is sleeved on the pole core of the probe, a shielding ring is sleeved on the outer side of the insulating ring, and the end part of the shielding ring is provided with a primary annular step. Furthermore, the outer diameter of the metal shell, the outer diameter of the insulating ring seat and the outer diameter of the shielding ring are equal to the diameter of the inner cavity of the insulating shell. The design is to stably sleeve the pole core, the insulating ring and the shielding ring in the inner cavity of the insulating shell.
Furthermore, the insulating shell comprises a central shell with an inner cavity, a threaded column and an inverted round table which are coaxial with the central shell are arranged at the upper end of the central shell, the diameter of the lower bottom of the round table is larger than the outer diameter of the threaded column, and a gap is reserved between the round table and the threaded column. The threaded column is used for being connected with the inner hole of the base, and the round platform can be used for limiting the position of the base and playing a certain sealing role.
Furthermore, the mesopore of base include internal thread hole portion and spacing hole portion, the diameter of spacing hole portion is less than the diameter of internal thread hole portion. The design of spacing hole is used for the position of restriction base, also plays certain sealed effect.
The invention has the advantages that: because the part of the pole core embedded in the cylindrical metal shell generates the parasitic capacitance of the core to the shell, the polar core concentric ring excited by the equal potential is adopted to shield the unfavorable parasitic capacitance. Excitation voltage: the total voltage of the capacitor-resistor series system; equipotential: the voltages output by the integrated chip to the pole core and the shielding ring are the same and equal. The section of the metal column of the shielding ring has a supporting effect on the upper part of the probe, and the influence on a polytetrafluoroethylene insulating material and the change of capacitance value in thermal expansion and cooling and assembly process engineering are overcome. The actual meaning is that the utmost point core cover is in the plastic casing of outside, if the height of cylinder utmost point core is less than the height of plastic casing, can leave the space in the upper portion, and the difference of oil tank temperature will make plastic casing take place deformation, if utmost point core and plastic casing wait high, has the parasitic capacitance effect of eliminating that does not have the shield ring, will influence the accuracy of gathering electric capacity, and the size of parasitic capacitance has very big influence to whole capacitance test.
Drawings
FIG. 1 is a schematic diagram of a circuit board and base mounting structure of a sensor according to the present invention;
FIG. 2 is a view taken along line A of FIG. 1;
FIG. 3 is a view from the direction B of FIG. 1;
FIG. 4 is a schematic external view of the sensor probe of FIG. 1;
FIG. 5 is a sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic perspective view of the base;
FIG. 7 is a schematic view of the structure of the probe;
FIG. 8 is a schematic structural view of an insulating ring;
FIG. 9 is a schematic view of a shield ring;
fig. 10 is a schematic perspective view of the sensor body.
The reference numbers are recorded as follows: 1-base, 1.1-limit hole part, 1.2-internal thread hole part, 1.3-screw hole part, 2-sensor body, 2.1-insulating shell, 2.1.1-central shell, 2.1.2-round table, 2.1.3-threaded column, 2.2-probe, 2.3-insulating ring, 2.4-shielding ring, 2.2.1-metal shell, 2.2.2-pole core, 3-circuit board, 4-fixing bolt, 5-clamping bolt, 6-nut, 7-copper column and 8-heat-conducting silica gel.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The utility model provides a sensor (see fig. 1 to fig. 3), includes circuit board 3 on the base 1 of sensor probe and installation sensor probe, circuit board 3 fix with the sensor probe through two copper post 7 of fixing the cuboid on base 1, copper post 7 on be provided with fixing bolt hole and the centre gripping bolt hole that runs through the copper post, the fixing bolt hole is perpendicular with the centre gripping bolt hole, copper post 7 fixes on the fixed orifices on the base through the downthehole fixing bolt 4 of fixing bolt, two fixing orifices are on the base bottom surface one pass the base axis the straight line on and be located the both sides of axis, clamping bolt 5 is installed in the centre gripping bolt hole, and is provided with nut 6 on clamping bolt 5, and circuit board 3 is fixed with copper post 7 through clamping bolt 5 and nut 6, and two copper posts 7 are located the both sides of circuit board 3.
On the basis of the technical scheme, in order to achieve the convenience of use and the stability of equipment, the invention can also make the following improvements on the technical scheme:
The sensor probe (see fig. 4-10) comprises a base 1 with a middle hole with internal threads and a sensor body 2 (see fig. 4, 5, 6 and 10) with external threads at the upper end, wherein the sensor body 2 comprises an insulating shell 2.1 with an inner cavity, the open end of the insulating shell 2.1 is provided with external threads matched with the base, the bottom of the inner cavity of the insulating shell 2.1 is provided with the probe 2.2, the probe 2.2 comprises a coaxial pole core 2.2.2 and a metal shell 2.2.1 (see fig. 5 and 7), one end of the pole core 2.2.2 extends out of the metal shell 2.2.1, a T-shaped insulating ring 2.3 consisting of an insulating ring seat and an insulating ring body is sleeved on the pole core 2.2.2.2 of the probe, a shielding ring 2.4 is sleeved outside the insulating ring 2.3, and the end of the shielding ring 2.4 is provided with a first-stage annular step.
On the basis of the above technical solutions, in order to achieve convenience of use and stability of equipment, the present invention may further make the following improvements on the above technical solutions, and the following improvements may be implemented separately or together in the technical solutions of the above embodiments:
the outer diameter of the metal shell 2.2.1, the outer diameter of the insulating ring seat and the outer diameter of the shielding ring are equal to the diameter of the inner cavity of the insulating shell 2.1.
The insulating shell 2.1 comprises a central shell 2.1.1 (see fig. 10) with an inner cavity, a threaded column 2.1.3 coaxial with the central shell and an inverted circular truncated cone 2.1.2 are arranged at the upper end of the central shell 2.1.1, the diameter of the lower bottom of the circular truncated cone 2.1.2 is larger than the outer diameter of the threaded column, and a gap is reserved between the circular truncated cone and the threaded column.
The middle hole of the base 1 comprises an internal thread hole part 1.2 and a limiting hole part 1.1, and the diameter of the limiting hole part is smaller than that of the internal thread hole part (see figure 5).
Two screw holes 1.3 are arranged on the end surface of the base 1 (see fig. 6).
The insulating ring is made of plastic materials, and the shielding ring is made of metal copper materials. The insulating shell is made of polytetrafluoroethylene, and the pole core is made of metal copper. The metal shell and the shielding ring have the function of shielding the capacitor. The tip of shield ring is provided with one-level annular step, and its effect does benefit to better welding (lead wire welding on the circuit board is on metal copper shield ring, because metal copper heat dissipation is very fast, and the electric iron is placed in the one-time of becket, and the temperature reduces, and the welding is difficult, has this one-level annular step effect ratio great), and secondly, the tip of utmost point core also can set up one-level step, realizes similar effect.
The capacitance of the capacitive sensor mainly comprises a dielectric capacitance and a parasitic capacitance, and the parasitic capacitance is also called as a dead capacitance and is an interference value in measurement. The dead capacitance directly causes the reduction of the sensitivity of the sensor, and the formula calculation shows that when the geometric shape of the sensor probe is fixed, the smaller the dead capacitance of the sensor probe is, the higher the Q value of the sensor is, and the higher the sensitivity of the whole sensor probe is. The concentric metal ring structure can shield the unfavorable capacitance of a certain pole core to the metal shell, and the unfavorable capacitance and the excitation action of the pole core with the same potential can make the parasitic capacitance negligible to the dielectric capacitance.
A concentric ring made of brass material and concentric with the pole core is used as a structural device for eliminating parasitic capacitance. The same potential excitation as the pole core is used to further eliminate the parasitic capacitance of the pole core to the ground of the outer metal shell. (the metal ring and the core wire are equipotential, so that the capacitive leakage of the core wire to the shielding is eliminated, the influence of parasitic capacitance is overcome, the capacitance Cx between the inner layer and the outer layer becomes the load of the driving amplifier, the capacitance sensor is limited by the geometric dimension, the capacitance is very small, generally, only a few pF to dozens pF., because C is too small, the capacitance reactance XC is 1/omega C is very large and is a high-impedance element, therefore, the driving amplifier can be regarded as an in-phase amplifier with very high input impedance, capacitive load and amplification factor of 1). Structurally, if the shielding wire is directly connected with the pole core without the shielding ring, a space is reserved between the pole core and the hollow position of the metal shell, and the dielectric capacitance is influenced finally due to expansion with heat and contraction with cold caused by the assembly process and the temperature.
Drawing an axis line through the circle center on a metal base of the fixed circuit board, intersecting the center of the circle in the bottom edge of the rectangular circuit board and being perpendicular to the axis line, making an intersection point perpendicular to the axis line from the circle centers of the two fixed holes on the circuit board, and arching a 4mm hole wire at the intersection point. Two copper columns are manufactured and respectively installed on the diagonal line of the positive side of the circuit board, solid silicone grease is additionally installed on one copper column to fill the gap between the copper column and the temperature sensing chip of the circuit board, screws which are perpendicular to the metal base and parallel to the circuit board are preset on the copper column, and the copper column is fixed on the metal base through the screws.
The temperature of the environmental medium is conducted to the temperature sensing chip through the metal shell copper column heat conduction solid silicone grease. The circuit board and the metal base are connected at opposite angles of a concentric axis through copper column screws.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A sensor is characterized by comprising a sensor probe and a circuit board on a base for mounting the sensor probe, wherein the circuit board is fixed with the sensor probe through two cuboid copper columns fixed on the base, the copper columns are provided with fixing bolt holes and clamping bolt holes penetrating through the copper columns, the fixing bolt holes are perpendicular to the clamping bolt holes, the copper columns are fixed on the fixing holes on the base through fixing bolts in the fixing bolt holes, the two fixing holes are arranged on a straight line passing through the central axis of the base on the bottom surface of the base and positioned on two sides of the central axis, the clamping bolts are mounted in the clamping bolt holes, nuts are arranged on the clamping bolts, the circuit board is fixed with the copper columns through the clamping bolts and the nuts, and the two copper columns are positioned on two sides of the circuit board;
one copper column is a long copper column, the other copper column is a short copper column, and heat-conducting silica gel is arranged between the long copper column and the circuit board;
the sensor probe comprises a base with an internal thread middle hole and a sensor body with an external thread at the upper end, the sensor body comprises an insulating shell with an inner cavity, the open end of the insulating shell is provided with an external thread matched with the base, the bottom of the inner cavity of the insulating shell is provided with the probe, the probe comprises a coaxial pole core and a metal shell, one end of the pole core extends out of the metal shell, a T-shaped insulating ring composed of an insulating ring seat and an insulating ring body is sleeved on the pole core of the probe, a shielding ring is sleeved on the outer side of the insulating ring, and the end part of the shielding ring is provided with a primary annular step.
2. The sensor of claim 1, wherein the outer diameter of the metal shell, the outer diameter of the insulating ring seat, and the outer diameter of the shielding ring are equal to the diameter of the inner cavity of the insulating shell.
3. The sensor of claim 1, wherein the insulating housing comprises a central housing with an inner cavity, a threaded post and an inverted circular truncated cone are arranged at the upper end of the central housing, the threaded post and the inverted circular truncated cone are coaxial with the central housing, the diameter of the lower bottom of the circular truncated cone is larger than the outer diameter of the threaded post, and a gap is reserved between the circular truncated cone and the threaded post.
4. The sensor of claim 1, wherein the central bore of the base includes an internally threaded bore portion and a stop bore portion, the stop bore portion having a diameter less than a diameter of the internally threaded bore portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810290040.2A CN108731706B (en) | 2018-04-03 | 2018-04-03 | Sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810290040.2A CN108731706B (en) | 2018-04-03 | 2018-04-03 | Sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108731706A CN108731706A (en) | 2018-11-02 |
| CN108731706B true CN108731706B (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810290040.2A Active CN108731706B (en) | 2018-04-03 | 2018-04-03 | Sensor |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029209B (en) * | 2021-04-01 | 2022-04-05 | 山东大学 | Monopole capacitive sensor and connector device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178403A (en) * | 2011-12-21 | 2013-06-26 | 纬创资通股份有限公司 | Clamping mechanism |
| CN204903334U (en) * | 2015-08-19 | 2015-12-23 | 西安傲蓝机电科技有限公司 | Fluid characteristic sensor module |
| CN106017395A (en) * | 2016-06-28 | 2016-10-12 | 国营芜湖机械厂 | Aircraft horizontal rudder surface angle measuring device |
| CN206100738U (en) * | 2016-08-30 | 2017-04-12 | 西安索普电气技术有限公司 | Circuit board mounting structure |
| CN106950258A (en) * | 2016-12-29 | 2017-07-14 | 核工业北京化工冶金研究院 | The sender device of measurement residual acidity or basicity in ore pulp is leached for uranium mine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7365553B2 (en) * | 2005-12-22 | 2008-04-29 | Touchdown Technologies, Inc. | Probe card assembly |
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2018
- 2018-04-03 CN CN201810290040.2A patent/CN108731706B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178403A (en) * | 2011-12-21 | 2013-06-26 | 纬创资通股份有限公司 | Clamping mechanism |
| CN204903334U (en) * | 2015-08-19 | 2015-12-23 | 西安傲蓝机电科技有限公司 | Fluid characteristic sensor module |
| CN106017395A (en) * | 2016-06-28 | 2016-10-12 | 国营芜湖机械厂 | Aircraft horizontal rudder surface angle measuring device |
| CN206100738U (en) * | 2016-08-30 | 2017-04-12 | 西安索普电气技术有限公司 | Circuit board mounting structure |
| CN106950258A (en) * | 2016-12-29 | 2017-07-14 | 核工业北京化工冶金研究院 | The sender device of measurement residual acidity or basicity in ore pulp is leached for uranium mine |
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| Publication number | Publication date |
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| CN108731706A (en) | 2018-11-02 |
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