CN113340516A - Pressure measuring cell - Google Patents
Pressure measuring cell Download PDFInfo
- Publication number
- CN113340516A CN113340516A CN202110633236.9A CN202110633236A CN113340516A CN 113340516 A CN113340516 A CN 113340516A CN 202110633236 A CN202110633236 A CN 202110633236A CN 113340516 A CN113340516 A CN 113340516A
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- pressure sensor
- preamplifier
- circuit
- measurement unit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
- G01L9/04—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning of resistance-strain gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a pressure measuring unit, which relates to the field of pressure measurement and comprises a pressure sensor, a preamplifier electric appliance and a plurality of interface filter circuit modules, wherein each input end and each output end of the preamplifier are connected with the interface filter circuit modules; each input end and each output end of the preamplifier are connected with the interface filter circuit module, high-frequency interference in signals input into the preamplifier and high-frequency interference in signals output by the preamplifier are filtered, and interference of a space electromagnetic field is suppressed on the main circuit of the pressure measurement unit.
Description
Technical Field
The invention relates to the field of pressure measurement, in particular to a pressure measurement unit.
Background
In a strong space electromagnetic field interference environment formed by high-voltage and large-current pulses and a dynamic working environment with random directions and random magnitude vibration and impact in a test, a real-time measurement value of the pressure change of high-pressure gas in the test is important data for analyzing the working state of a tested product, and pressure measurement needs to be carried out through a pressure sensor and a matched preamplifier of the pressure sensor; the typical principle of the traditional strain gauge and metal circular diaphragm pressure sensor for measuring high-pressure gas is divided into a strain gauge adhesive pressure sensor and a sputtering film pressure sensor; the output signals of the two pressure sensors are characterized by small sensitivity which is generally less than 2mV/V, the millivolt-level small signal is easily covered by external interference, and in order to solve the problem of interference resistance of the pressure measurement unit, the traditional method is to embed a preamplifier circuit into the pressure sensor shell, hopefully, the transmission distance between the pressure sensor and the preamplifier is shortened to avoid interference, and then the electromagnetic compatibility of the product is achieved through the shielding measures of the circuit and the cable, although the mode improves the electromagnetic compatibility of the pressure measuring unit, the electromagnetic compatibility of the pressure measuring unit working under the space electromagnetic field environment formed by high-voltage and large-current pulses cannot be fundamentally solved from the circuit, meanwhile, the integrated pressure measurement unit is much larger than an independent pressure sensor in volume, so that the pressure measurement unit is not beneficial to being used in a limited installation space environment.
Disclosure of Invention
The object of the present invention is to provide a pressure measuring cell in order to solve the above problems.
The invention realizes the purpose through the following technical scheme:
the pressure measuring unit comprises a pressure sensor, a pre-amplifier electric appliance and a plurality of interface filter circuit modules, wherein each input end and each output end of the pre-amplifier are connected with the interface filter circuit modules, a power supply inlet of the pressure sensor is connected with a power supply outlet of the pre-amplifier, and a signal output end of the pressure sensor is connected with a signal input end of the pre-amplifier.
The invention has the beneficial effects that: each input end and each output end of the preamplifier are connected with the interface filter circuit module, high-frequency interference in signals input into the preamplifier and high-frequency interference in signals output by the preamplifier are filtered, and interference of a space electromagnetic field is suppressed on the main circuit of the pressure measurement unit.
Drawings
FIG. 1 is a block circuit diagram of a preamplifier in a pressure measurement cell of the present invention;
FIG. 2 is a schematic diagram of a top view of a dual channel preamplifier in a pressure measurement cell according to the present invention;
FIG. 3 is a schematic diagram of the front view of the dual channel preamplifier of the pressure measurement unit of the present invention;
FIG. 4 is a schematic diagram of an interface filter circuit module in the pressure measurement unit of the present invention;
FIG. 5 is a schematic diagram of a preamplifier in the pressure measurement cell of the present invention;
FIG. 6 is a schematic diagram of a pressure sensor in the pressure measurement unit of the present invention;
FIG. 7 is a schematic view showing the structure of the pressure sensor mounted in the pressure measuring unit according to the present invention;
FIG. 8 is a schematic diagram of the structure of the elastomer in the pressure sensor of the present invention;
FIG. 9 is a schematic view of a strain gage assembly in the pressure sensor of the present invention;
FIG. 10 is a circuit diagram of the pressure sensor of the present invention;
wherein corresponding reference numerals are:
1-shielded cable line, 101-lead, 2-electric connector, 3-elastomer, 301-metal circular diaphragm, 302-threaded mounting hole, 303-first step, 304-mounting step, 4-connector base, 5-countersunk screw, 6-strain gauge component, 7-silicone gel, 8-bridge adapter plate, 9-sealing gasket, 10-upper cover, 11-tested product, 12-preamplifier, 1201-first connection interface, 1202-second connection interface, 1203-braid-picking interface and 13-metal mounting shell.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1, the pressure measurement unit includes a pressure sensor, a preamplifier 12 and a plurality of interface filter circuit modules, each input end and each output end of the preamplifier 12 are connected to the interface filter circuit module, a power supply inlet of the pressure sensor is connected to a power supply outlet of the preamplifier 12, and a signal output end of the pressure sensor is connected to a signal input end of the preamplifier 12; interface filter circuit modules are connected to each signal input and output (I/O) port of the preamplifier 12 to filter high-frequency interference of each group of signals, and the signals enter the preamplifier electric appliance 12 through the interface filter circuit modules and then output signals through the interface filter circuit modules by the preamplifier electric appliance 12, so that interference of a space electromagnetic field is suppressed.
As shown in fig. 4, the interface filter circuit modules each include a ferrite bead, an inductor, and a nonlinear device, the transmission signal passes through the ferrite bead, the inductor, and the nonlinear device in sequence, and the ferrite bead is a chip ferrite bead for absorbing electromagnetic radiation interference on the signal line; the inductance device selects a chip common-mode inductor to isolate the common-mode current interference conducted on the signal line; the nonlinear device can absorb surge current interference introduced by a signal wire by using a transient suppression diode, and can also play a role in protecting a main integrated circuit, the ferrite bead model MLCB2B2012-00B, the common mode inductor device model CMT0707-101/101D and the transient voltage suppression diode model SMAJ5.0A-SMAJ 36A, and the interface filter circuit module achieves the purpose of only filtering the interference and not attenuating normal signals.
As shown in FIG. 1, the preamplifier 12 further comprises a voltage-reducing and stabilizing circuit, a secondary voltage-stabilizing circuit and an amplifying circuit, wherein the input end of the voltage-reducing and stabilizing circuit is a power inlet of the preamplifier 12, the output end of the secondary voltage-stabilizing circuit is a power outlet of the preamplifier 12, the output end of the voltage-reducing and stabilizing circuit is respectively connected with the working power input end of the secondary voltage-stabilizing circuit and the working power input end of the amplifying circuit, the output end of the secondary voltage-stabilizing circuit is connected with the power inlet of the pressure sensor, the output end of the pressure sensor is connected with the input end of the amplifying circuit, the signal output end of the amplifying circuit is connected with the signal input end of the encoder for collecting signals, the working power is sequentially transmitted to the voltage-reducing and stabilizing circuit through a ferrite bead, an inductor and a nonlinear device, the power output by the secondary voltage-stabilizing circuit is sequentially transmitted to the pressure sensor through the ferrite bead, the inductor and the nonlinear device, signals output by the pressure sensor sequentially pass through the ferrite bead, the inductance device and the nonlinear device to reach the amplifying circuit, and signals output by the amplifying circuit sequentially pass through the ferrite bead, the inductance device and the nonlinear device to be transmitted to the mining and editing device.
The PCB of the preamplifier 12 comprises a power supply layer, a stratum and 2 signal lines, wherein the number of the signal lines is totally four, the amplifying circuit is distributed on the upper surface of the PCB, the interface filter circuit module device is distributed on the lower surface of the PCB and is arranged at the nearest part to the electric connector, the PCB adopts a four-layer design, the power supply layer is independent, the stratum is independent, surface-mounted components are used, the signal lines are distributed on the surfaces of the components and fewer via holes are used, and the anti-interference capability of the PCB is effectively improved.
The signal output end of the pressure sensor is connected with the input end of the amplifying circuit sequentially through the interface filter circuit module and the three-terminal capacitor, and the three-terminal capacitor is directly connected to the input end of the amplifying circuit and selects a proper capacitance value, so that high-frequency common-mode interference is filtered.
As shown in fig. 2 and 3, the pressure measuring unit further includes a metal mounting shell 13, the preamplifier 12 is mounted in the metal mounting shell 13, electrical interfaces in circuit communication with the preamplifier 12 are both mounted on the outer side surface of the metal mounting shell 13, the codec interface 1203 of the preamplifier 12 is connected with the codec through a connecting cable, the first connecting interface 1201 and the second connecting interface 1202 of the preamplifier 12 are connected with the input interface and the output interface of the pressure sensor through a shielding cable 1, two ends of the shielding cable 1 are respectively in short circuit conduction with the pressure sensor and the metal housing by 360 °, the shielding cable 1 is in short circuit with the metal mounting shell 13 and is in conduction with the metal mounting shell to realize full shielding of the circuit, so as to cut off the magnetic circuit of the electromagnetic field; the electrical interfaces of the preamplifier 12 are all designed on the side surface of the metal mounting shell 13, so that common-mode current from the cable shielding layer and the metal mounting shell 13 is inhibited from flowing through the PCB, and a normal signal is ensured to enter the PCB.
Pressure sensor includes nozzle base 4, elastomer 3, strainometer subassembly 6, bridge keysets 8, sealed pad 9 and upper cover 10, 3 fixed mounting of elastomer are in the upper end of nozzle base 4, strainometer subassembly 6 installs in elastomer 3, the upper end fixed connection of upper cover 10 and elastomer 3, sealed pad 9 is located between the upper end of upper cover 10 and elastomer 3, the lateral wall upper end of elastomer 3 is provided with threaded mounting hole 302, the first end interference fit of shielding cable line 1 installs in threaded mounting hole 302, four wires in the shielding layer of shielding cable line and the shielding cable line 1 weld respectively at the different positions of bridge keysets 8.
When the pressure sensor is installed, the nozzle base 4 is directly welded on a container of a product 11 to be measured, a threaded sleeve and a nozzle in the traditional structure are eliminated, the radial size of the pressure sensor is reduced, the limitation of the pressure sensor on the use space is reduced, and the sensor can be normally used under the condition of limited use space;
the upper end of the side wall of the elastic body 3 is provided with an M3.5 threaded mounting hole 302, the effective depth of the threaded mounting hole 302 is about 0.19mm, the threaded mounting hole can be in interference fit with a shielding cable 1 with the outer diameter phi of 3.8mm, the shielding cable 1 is slowly screwed into the threaded mounting hole 302 of the elastic body 3 in assembly, a shielding layer of the shielding cable 1 is welded on the bridge adapter plate 8, four wires 101 in the shielding cable 1 and a silver wire of the strain gauge component 6 are all welded on the bridge adapter plate 8, a working power supply and an output signal of the pressure sensor are all led out through the shielding cable 1, the axial size of the pressure sensor is further reduced by leading out a circuit signal of the pressure sensor from the side wall of the elastic body 3 through the shielding cable 1, the overall mass of the pressure sensor is reduced, and the reliability of the pressure sensor in vibration and impact working environments is improved;
the shielding cable 1 is a four-core shielding cable, the pressure sensor transmits circuit signals through the shielding cable 1, and a shielding layer of the shielding cable 1 is connected with the elastic body 3, so that the full shielding of the pressure sensor circuit is realized, and the purpose of shielding space electromagnetic field interference formed by instantaneous high voltage and large current is achieved;
as shown in fig. 8, a first side surface of a metal circular diaphragm in the elastic body 3 is communicated with a product to be measured, the strain gauge assembly is bonded to a second side surface of the metal circular diaphragm, the metal circular diaphragm is perpendicular to a central axis of the elastic body 3, and the periphery of the metal circular diaphragm is fixedly supported to form a cylindrical structure, as shown in fig. 9 and 10, the strain gauge assembly 6 is integrated by four strain resistance sheets, the four strain resistance sheets form a wheatstone bridge, and signals of the wheatstone bridge are transmitted to the preamplifier 12 through the shielding cable 1 and the electric connector 2.
An installation step 304 is arranged on the elastic body 3, a bridge adapter plate 8 is installed in the installation step 304, silver wires and wires 101 led out of the strain gauge assembly 6 are welded on the bridge adapter plate, the wires 101 at the first end of the shielding cable 1 are fixedly connected with the elastic body 3 through silicone gel 7, and the bridge adapter plate 8 is installed in the installation step 304.
The installation step 304 for installing the bridge adapter plate 8 is designed on the elastic body 3, the silver wire and the lead 101 are welded on the bridge adapter plate 8, the silver wire led out from the strain gauge component 6 is welded with the lead at the input end of the shielding cable 1 through the bridge adapter plate 8 in a switching manner, the problem that the lead 101 is not uniform in thickness and is easy to break due to direct welding is avoided, the silver wire and the lead 101 of the strain gauge component 6 are suspended, the suspended lead 101 is fixed by filling and sealing the silica gel 7, the reliability of the pressure sensor in the dynamic environment of vibration and impact is ensured from the manufacturing process, the shielding layer of the shielding cable 1 is directly welded on the bridge adapter plate, and the reliability of the installation of the shielding cable 1 is enhanced.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (8)
1. A pressure measurement unit, characterized by: the pressure sensor comprises a pressure sensor, a pre-amplifier electric appliance and a plurality of interface filter circuit modules, wherein each input end and each output end of the pre-amplifier are connected with the interface filter circuit modules, a power supply inlet of the pressure sensor is connected with a power supply outlet of the pre-amplifier, and a signal output end of the pressure sensor is connected with a signal input end of the pre-amplifier.
2. The pressure measurement unit of claim 1, wherein: the interface filter circuit modules comprise ferrite beads, inductance devices and nonlinear devices, and transmission signals sequentially pass through the ferrite beads, the inductance devices and the nonlinear devices.
3. The pressure measurement unit of claim 1, wherein: the preamplifier comprises a voltage reduction and voltage stabilization circuit, a secondary voltage stabilization circuit and an amplifying circuit, wherein the input end of the voltage reduction and voltage stabilization circuit is a power supply inlet of the preamplifier, the output end of the secondary voltage stabilization circuit is a power supply outlet of the preamplifier, the output end of the voltage reduction and voltage stabilization circuit is respectively communicated with a working power supply input end of the secondary voltage stabilization circuit and a working power supply input end of the amplifying circuit, the output end of the secondary voltage stabilization circuit is connected with a power supply inlet of a pressure sensor, the output end of the pressure sensor is communicated with the input end of the amplifying circuit, and the signal output end of the amplifying circuit is connected with the signal input end of the editor used for collecting signals.
4. A pressure measuring unit according to claim 3, characterized in that: the PCB of the preamplifier comprises a power supply layer, a ground layer and two signal lines, an amplifying circuit of the preamplifier is distributed on the upper surface of the PCB, and an interface filter circuit module is distributed on the lower surface of the PCB.
5. The pressure measurement unit of claim 4, wherein: and the signal output end of the pressure sensor is connected with the input end of the amplifying circuit sequentially through the interface filter circuit module and the three-terminal capacitor.
6. The pressure measurement unit of claim 1, wherein: the pressure measurement unit further comprises a metal mounting shell, the preamplifier is mounted in the metal mounting shell, electrical interfaces communicated with the preamplifier circuit are mounted on the outer side face of the metal mounting shell, and two ends of the shielding cable are respectively in short circuit conduction with the pressure sensor and the metal shell for 360 degrees.
7. The pressure measurement unit of claim 6, wherein: pressure sensor includes the nozzle base, the elastomer, strainometer subassembly and electric bridge keysets, elastomer fixed mounting is in the upper end of nozzle base, strainometer unit mount is in the elastomer, the lateral wall upper end of elastomer is provided with the screw thread mounting hole, the first end interference fit of shielding cable conductor is installed in the screw thread mounting hole, four wires in the shielding layer of shielding cable conductor and the shielding cable conductor weld respectively in the different positions of electric bridge keysets, the second end of shielding cable conductor is installed in the electric connector, during the installation pressure sensor, the nozzle base welds on the container of being surveyed the product.
8. The pressure measurement unit of claim 7, wherein: the elastic body is provided with an installation step, the bridge adapter plate is installed in the installation step, the silver wire led out by the strain gauge assembly is welded on the bridge adapter plate, and the lead at the first end of the shielding cable is fixedly connected with the elastic body through silicone gel.
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| CN202110633236.9A CN113340516B (en) | 2021-06-07 | 2021-06-07 | Pressure measuring cell |
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| CN202110633236.9A CN113340516B (en) | 2021-06-07 | 2021-06-07 | Pressure measuring cell |
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| CN113340516A true CN113340516A (en) | 2021-09-03 |
| CN113340516B CN113340516B (en) | 2023-03-17 |
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| 龙先江;: "基于dsPIC33F的矿用本质安全型智能压力传感器" * |
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