CN112197901A - Pressure switch sensor detection device and detection method - Google Patents
Pressure switch sensor detection device and detection method Download PDFInfo
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- CN112197901A CN112197901A CN202011077352.9A CN202011077352A CN112197901A CN 112197901 A CN112197901 A CN 112197901A CN 202011077352 A CN202011077352 A CN 202011077352A CN 112197901 A CN112197901 A CN 112197901A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
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Abstract
The invention discloses a pressure switch sensor detection device and a detection method, wherein the detection device comprises a control module, a pressure measurement module, a pressure switch sensor interface module, a power supply and battery management module, a display module and a function key module; the control module is used for receiving data from the pressure measurement module, the pressure switch sensor interface module and the function key module, and outputting a result to the display module after processing; the pressure measurement module is used for acquiring a pressure value of the pressure transmitter; the pressure switch sensor interface module is used for verifying an external pressure switch sensor; the power supply and battery management module is used for supplying power to the control module, the pressure measurement module, the pressure switch sensor interface module and the display module; the function key module is used for inputting control commands. The invention automatically identifies the action change of the pressure switch sensor by arranging the modules, thereby realizing the automatic verification of the working state of the pressure switch sensor.
Description
Technical Field
The invention relates to the technical field of pressure detection, in particular to a pressure switch sensor detection device and a detection method.
Background
In power systems and other electrical control systems, various types of pressure switch sensors (pressure switches) are often applied to occasions where pressure measurement is required, and as a locking action element or a starting element for pressure protection, the working reliability of the pressure switch sensor is an important guarantee for ensuring the reliable operation of a pressure detection system and other pressure control systems. Therefore, the characteristic parameters of the pressure switch sensor must be tested regularly to ensure the accuracy and correctness of the operation thereof. The conventional maintenance method of the pressure switch sensor mainly has the following two main problems:
firstly, the pressure switch sensor is always verified in a completely manual manner. In the face of the scheduled maintenance work of a pressure detection system comprising a large number of pressure switch sensors, technicians need to carry out a large amount of repeated labor, so that the technicians have high labor intensity and low verification efficiency and are easy to cause fatigue.
Secondly, the subjectivity for checking whether the data meets the technical requirements is strong. At present, the pressure switch sensor is checked by a traditional pressure check meter. During inspection, one worker operates the handle through the pressure applying device to complete specified pressure applying operation, the other worker accesses the universal meter and the traditional pressure calibrator, and the pressure value displayed by the traditional pressure calibrator is observed in real time while the action condition of the switch type pressure switch sensor is measured. When the switch-type pressure switch sensor triggers the on-off of the switch in the pressing process of the external pressing device, at the moment, a worker immediately stops pressing and records the pressure value displayed by the current traditional pressure calibrator, and the pressure value is the action threshold value of the switch-type pressure switch sensor. For the operator of the pressure tester, it is often the case that there is too much pressurization or too much pressure relief. For a sensor node measurer, a multimeter needs to be held by hands, the action condition of the multimeter is observed by naked eyes, and an action pressure result is manually recorded, so that action of a pressure switch sensor is delayed, and reading has certain subjectivity; moreover, the manual mode is adopted to record the measurement result, which is not beneficial to the recording, storage and analysis of data.
Disclosure of Invention
Aiming at the problems, the invention provides a pressure switch sensor detection device, which mainly solves the problems that the traditional pressure measurement and the pressure switch sensor verification are separated, and the practical application is complicated.
In order to solve the technical problems, the invention provides a pressure switch sensor detection device on one hand, which comprises a control module, a pressure measurement module, a pressure switch sensor interface module, a power supply and battery management module, a display module and a function key module; the control module is used for receiving data from the pressure measurement module, the pressure switch sensor interface module and the function key module, and outputting a result to the display module after processing; the pressure measurement module is used for acquiring a pressure value of the pressure transmitter; the pressure switch sensor interface module is used for switching a resistance gear or a voltage gear according to the type of an external pressure switch sensor; the power supply and battery management module is used for supplying power to the control module, the pressure measurement module, the pressure switch sensor interface module and the display module; the function key module is used for inputting control commands.
In another aspect of the present invention, a method for detecting a pressure switch sensor using the above-mentioned apparatus for detecting a pressure switch sensor is provided, which comprises the following steps,
The invention has the beneficial effects that: the detection device provided by the invention is provided with the control module, the pressure measurement module, the pressure switch sensor interface module, the power supply and battery management module, the display module and the function key module, so that the action change of the pressure switch sensor is automatically identified, and the automatic verification of the working state of the pressure switch sensor is realized.
Drawings
FIG. 1 is a schematic diagram of a pressure switch sensor detection device according to an embodiment of the disclosure;
FIG. 2 is a minimal system of STM32F103RCT6 disclosed by an embodiment of the invention;
FIG. 3 is a schematic diagram of a pressure switch sensor interface module according to an embodiment of the disclosure;
FIG. 4 is a switching circuit diagram of a pressure switch sensor interface module according to an embodiment of the disclosure;
FIG. 5 is a schematic block diagram of a resistance level measurement of a pressure switch sensor interface module according to an embodiment of the present disclosure;
FIG. 6 is a voltage divider circuit diagram of a resistor stage according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of a constant current source of the pressure switch sensor interface module according to an embodiment of the disclosure;
FIG. 8 is a schematic block diagram of a voltage level measurement of a pressure switch sensor interface module according to an embodiment of the present disclosure;
FIG. 9 is a diagram of a three-way voltage measurement switching circuit according to an embodiment of the present invention;
FIG. 10 is a circuit diagram of the over-voltage and over-current protection circuit for the voltage level disclosed in the embodiment of the present invention;
FIG. 11 is a circuit diagram of an isolation amplifier according to an embodiment of the present invention;
FIG. 12 is a circuit diagram of an application of the DC-DC isolated power supply disclosed by the embodiment of the invention;
FIG. 13 is a functional block diagram of a pressure measurement module disclosed in an embodiment of the present invention;
FIG. 14 is a circuit diagram of an application of the 24V boost unit disclosed in the embodiment of the present invention;
FIG. 15 is a circuit diagram of an exemplary application of the ADR423 according to the present invention;
FIG. 16 is a circuit diagram of an application of the pressure measurement module disclosed in the embodiments of the present invention;
FIG. 17 is a system block diagram of a power supply and battery management module disclosed in an embodiment of the present invention;
FIG. 18 is a circuit diagram of a power switching module according to an embodiment of the disclosure;
FIG. 19 is a circuit diagram of a battery charge management unit and a battery boosting unit according to an embodiment of the present invention;
fig. 20 is a circuit diagram of a battery charge protection unit and a battery discharge protection unit according to an embodiment of the present invention;
FIG. 21 is a flowchart of a main process of a pressure switch sensor detection method according to an embodiment of the present invention;
FIG. 22 is a flowchart of a verification process disclosed in an embodiment of the invention;
wherein: the system comprises a control module, a 2-pressure measurement module, a 3-pressure switch sensor interface module, a 4-power supply and battery management module, a 5-display module and a 6-function key module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
One application object of the invention is Guangzhou energy storage hydraulic power plant, and the main models of detection objects (pressure switch sensors) are PressswZPN206SH,5-50bar, Pressurswitch 200-1750PSI, RPPN CA3207 and the like. On the basis, the invention can realize the automatic detection of pressure measurement in 200bar and various types of pressure switch sensors.
As shown in fig. 1, the present embodiment provides a pressure switch sensor detection apparatus, which includes a control module 1, a pressure measurement module 2, a pressure switch sensor interface module 3, a power supply and battery management module 4, a display module 5 and a function key module 6; the control module 1 is used for receiving data from the pressure measurement module 2, the pressure switch sensor interface module 3 and the function key module 6, and outputting a result to the display module 5 after processing; the pressure measurement module 2 is used for acquiring a pressure value of the pressure transmitter; the pressure switch sensor interface module 3 is used for switching a resistance gear or a voltage gear according to the type of an external pressure switch sensor; the power supply and battery management module 4 is used for supplying power to the control module 1, the pressure measurement module 2, the pressure switch sensor interface module 3 and the display module 5; the function key module 6 is used for inputting control commands.
The detection device provided by the invention is provided with the control module 1, the pressure measurement module 2, the pressure switch sensor interface module 3, the power supply and battery management module 4, the display module 5 and the function key module 6, so that the action change of the pressure switch sensor is automatically identified, and the automatic verification of the working state of the pressure switch sensor is realized. The device is more convenient to use than a pressure calibrator measuring technology requiring the cooperation of an additional multimeter.
Further, the control module 1 is STM32F103RCT6, the minimum system of which is shown in FIG. 2. The display module 5 adopts a 3.12-inch blue OLED screen with the resolution of 256x64, and the screen interface is an SPI serial bus interface and mainly has the functions of displaying pressure measurement values, pressure switch sensor states and system states. The system status includes the current power supply and battery management module 4 status, the current pressure switch sensor interface gear, operating instructions, and the temperature of the control module 1.
The function key module 6 includes 5 tact switches, each for implementing a specific function. The same key realizes different functions such as an operation/hold function, a trigger start/trigger stop function, a pressure value zeroing function, a pressure unit switching function and a key lock function according to different menus. The run/hold function is adapted to the pressure measurement module, and the pressure measurement switches between run and hold states each time the button is pressed. The pressure value zeroing function is applicable to the pressure measurement module and is used for compensating the zero point of the external pressure. The pressure unit switching is applicable to a pressure measurement module and a pressure switch sensor interface module and is used for switching common pressure display units of bar, psi and MPa. The function of the key lock is suitable for a pressure measurement module and a pressure switch sensor interface module, and the key lock locks or unlocks the operation of the other 4 keys after being pressed for 5 seconds. The pressure switch sensor interface module is characterized by further comprising a sound production module which is a buzzer, the triggering start/stopping function is only suitable for the pressure switch sensor interface module, when the function is started, the calibrator monitors the interface state of the pressure switch sensor, when the state is found to change, the display of the current pressure value is locked, the interface state change condition is indicated, and meanwhile, the buzzer sends a loud prompt.
As shown in fig. 3, the pressure switch sensor interface module 3 is converted into a resistance stage or a voltage stage by setting a mechanical contact switch, and the resistance stage and the voltage stage correspond to the switch-type pressure switch sensor and the voltage-type pressure switch sensor, respectively. Pressure switch sensors normally perform mechanical or electrical actions when a pressure is detected above a certain threshold. The switching circuit of different types of pressure switch sensors is shown in fig. 4, wherein the core is a mechanical relay G6S-2-5VDC, and the mechanical action is represented by the change of a contact switch, namely a normally open contact can become a normally closed contact, or a normally closed contact can become a normally open contact, which is called a switch type pressure switch sensor; the electric action is normally electrified, and the interface voltage changes by more than 10V during the action, which is called as a voltage type pressure switch sensor. The input of the pressure switch sensor interface module 3 comprises an R port, a G port, a B port and a COM port, wherein the four ports of the R port, the G port, the B port and the COM port correspond to voltage gears, and the three ports of the R port, the G port and the B port correspond to resistance gears.
As shown in fig. 5, one port of the resistor stage outputs a constant current source generated by the constant current source generator to the switch-type pressure switch sensor, and the other two ports of the resistor stage respectively obtain voltages of the switch-type pressure switch sensor, and the voltages pass through the sampling resistor and are input to the analog-to-digital converter. As shown in FIG. 6, the maximum measurement voltage of the resistor voltage-dividing circuit is 400V, the high impedance input end of about 1.66M omega is formed by multistage 1206 package and 332K omega with withstand voltage of 200V in series, the divided voltage output adopts 1nF filtering, and a 15V bidirectional TVS tube is adopted to protect the divided voltage output. The circuit structure of the constant current source generator is shown in fig. 7. For a switch type pressure switch sensor, the pressure switch sensor interface module 3 outputs a constant current source, the resistance value of an external pressure switch interface can be obtained by measuring and sampling resistance voltage according to ohm's law, the value is used for judging the short circuit/open circuit of an internal switch of the pressure switch sensor, and the principle is similar to the short circuit gear function of a universal meter. The measurement is only used as on-off judgment, the pressure value cannot be accurately measured, and the result is only the switching value.
As shown in fig. 8, the voltage stage includes three ports for accessing voltage, the output end of the port is connected to the input end of the overvoltage and overcurrent protection circuit, the output end of the overcurrent protection circuit is connected to the input end of the divider resistor, the output end of the divider resistor is connected to the input end of the isolation amplifier, and the output end of the isolation amplifier is connected to the input end of the analog-to-digital converter. The voltage measuring circuit of the voltage grade interface is shown in fig. 9, and adopts a PhotoMOS optical coupler AQW210 as a change-over switch to measure the voltages of 3 interfaces in a time-sharing manner; the overcurrent protection circuit for voltage measurement is shown in fig. 10, the core of the overcurrent protection circuit is a fast fusing fuse and a piezoresistor 7D431K, the protection current is 0.25A, the protection voltage range is 387-473V, the continuous use voltage range is 275-350V, and the maximum limit is 710V. The isolation amplifier circuit is shown in FIG. 11, with the core being a high precision isolation amplifier AMC1200, with high magnetic field immunity silicon dioxide (SiO2) gates isolating the output from the input. The isolation gate is certified to provide voltage isolation up to 4000V peak according to UL1577 and IEC60747-5-2 standards. The amplifier also comprises a DC-DC isolation power supply, and as shown in FIG. 12, an integrated DC-DC isolation power supply module B0505LS-2WR2 is used as a core for supplying power for the isolation amplifier.
As shown in fig. 13, the pressure measurement module 2 includes a pressure transmitter, a sampling resistor, an analog-to-digital converter, a 24V boosting unit and a voltage reference source unit, the pressure transmitter is configured to linearly convert a pressure value (external pressure) applied to the pressure switch sensor into a 4-20 mA current output value, the sampling resistor is configured to convert the current output value into a voltage output value, the analog-to-digital converter reads the voltage output value and converts the voltage output value into a corresponding pressure value, and the 24V boosting unit is configured to boost a 5V voltage output by the power supply and the battery management module 4 into 24V to supply power to the pressure transmitter; the voltage reference source unit generates a 3V reference voltage with a temperature drift of 3 ppm/DEG C, and is used as a reference voltage of the analog-to-digital converter and the constant current source generator. The measuring range of the pressure transmitter is 20MPa, 24V direct current is adopted for power supply, and the precision is +/-0.2%. The voltage reference source unit is an ultra-precise, second generation external ion implantation field effect transistor (XFET) reference voltage source ADR423 of ADI corporation. The 24V boosting unit of the pressure switch sensor is shown in FIG. 14, and the core of the 24V boosting unit is an SX1308 switching power supply boosting chip. Voltage reference source unit as shown in fig. 15, core is ADR423, which generates 3V reference voltage with temperature drift of 3 ppm/deg.c, reference voltage for ADC and constant current source generator. The circuit of the pressure measurement module 2 is shown in fig. 16, the core chip is a 24-bit analog-to-digital converter ADS1220, the sampling resistor is a thin film resistor with 100R 0.05% precision of light king (Viking) company, and the temperature drift coefficient is only +/-5 ppm/DEG C, so that the system requirement is met.
As shown in fig. 17, the power supply and battery management module 4 includes a power adapter, a redundant power supply module, and a power supply switching module, wherein an output end of the power adapter is connected to input ends of the redundant power supply module and the power supply switching module, an output end of the redundant power supply module is connected to an input end of the power supply switching module, and the power supply switching module is used for switching to power supply of the power adapter or power supply of the redundant power supply module. The redundant power supply module comprises two paths of storage battery modules, and any path of storage battery module comprises a battery charging management unit, a battery charging protection unit, a battery discharging protection unit and a battery boosting unit which are sequentially arranged.
Fig. 18 shows a circuit diagram of the power supply switching module, the core switching component is two P-channel MOS transistors APM4953, the external adapter voltage is 5V, and automatic switching of the power adapter or the redundant power supply module can be realized. The batteries are 18650 lithium ion batteries with the capacity of 3200mAH, the two batteries are designed to be operated redundantly, and an independent battery charging management unit and a battery charging protection unit are arranged. Even if one of the batteries breaks down, the normal work of the calibrator cannot be influenced, only the endurance time is reduced, and the two batteries have no consistency requirement, so that the follow-up maintenance is facilitated.
The circuit of the battery charging management unit and the battery boosting unit is shown in fig. 19, the core part is TP5400, the chip integrates the charging management circuit and the 5V boosting circuit, the typical charging current is 1A, and the typical boosting output current is 1A.
The circuit of the battery charging protection unit and the battery discharging protection unit is shown in fig. 20, and the core of the circuit is composed of a single lithium ion battery special protection chip DW01A and a double N-channel MOS transistor FS 8205A.
As shown in fig. 21 and 22, a pressure switch sensor detection method using the pressure switch sensor detection device comprises the following steps,
The inspection processing comprises the following steps of 2.1, judging whether a port of the pressure switch sensor interface module 3 is electrified or not;
step 2.11, if the power supply is not charged, switching to a resistance gear, memorizing the current state of the pressure switch sensor, step 2.12, judging whether the state of the pressure switch sensor changes within a specified time, step 2.13, if the state of the pressure switch sensor changes, immediately acquiring the pressure value of the pressure switch sensor, locking the pressure value, displaying the pressure value on the display module 5, sending out a prompt tone, and if the state of the pressure switch sensor does not change, returning to the step 2.11;
and 2.21, if the voltage is charged, switching to a voltage gear, memorizing the current state of the pressure switch sensor, 2.22, judging whether the state of the pressure switch sensor changes within a specified time, 2.23, if the state of the pressure switch sensor changes, immediately acquiring the pressure value of the pressure switch sensor, locking the pressure value, displaying the pressure value on the display module 5, giving out a prompt tone, and if the state of the pressure switch sensor does not change, returning to the step 2.21.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. A pressure switch sensor detection device is characterized by comprising a control module, a pressure measurement module, a pressure switch sensor interface module, a power supply and battery management module, a display module and a function key module; the control module is used for receiving data from the pressure measurement module, the pressure switch sensor interface module and the function key module, and outputting a result to the display module after processing; the pressure measurement module is used for acquiring a pressure value of the pressure transmitter; the pressure switch sensor interface module is used for switching a resistance gear or a voltage gear according to the type of an external pressure switch sensor; the power supply and battery management module is used for supplying power to the control module, the pressure measurement module, the pressure switch sensor interface module and the display module; the function key module is used for inputting control commands.
2. The pressure switch sensor detection device of claim 1, wherein the pressure switch sensor interface module is switched to a resistance stage or a voltage stage by providing a mechanical contact switch, the resistance stage and the voltage stage corresponding to the switch type pressure switch sensor and the voltage type pressure switch sensor, respectively.
3. The pressure switch sensor detecting device according to claim 2, wherein one port of the resistor stage outputs a constant current source generated by a constant current source generator to the switch type pressure switch sensor, and the other two ports of the resistor stage respectively obtain voltages of the switch type pressure switch sensor, pass through the sampling resistor and then input to the analog-to-digital converter.
4. The pressure switch sensor detection device of claim 2, wherein the voltage stage comprises three ports for receiving voltage, wherein the output terminals of the ports are connected to the input terminals of an over-voltage and over-current protection circuit, the output terminal of the over-current protection circuit is connected to the input terminal of a voltage dividing resistor, the output terminal of the voltage dividing resistor is connected to the input terminal of an isolation amplifier, and the output terminal of the isolation amplifier is connected to the input terminal of an analog-to-digital converter.
5. The pressure switch sensor detection device according to claim 3, wherein the pressure measurement module comprises a pressure transmitter, a sampling resistor, an analog-to-digital converter, a 24V boosting unit and a voltage reference source unit, the pressure transmitter is configured to linearly convert a pressure value applied to the pressure switch sensor into a 4-20 mA current output value, the sampling resistor is configured to convert the current output value into a voltage output value, the analog-to-digital converter reads the voltage output value and converts the voltage output value into a corresponding pressure value, and the 24V boosting unit is configured to boost a 5V voltage output by the power supply and the battery management module to 24V, so as to supply power to the pressure transmitter; the voltage reference source unit generates a 3V reference voltage with the temperature drift of 3 ppm/DEG C, and the reference voltage is used as the reference voltage of the analog-to-digital converter and the constant current source generator.
6. The pressure switch sensor detection device of claim 4 or 5, wherein the analog-to-digital converter is ADS 1220.
7. The pressure switch sensor detection device of claim 1, wherein the power and battery management module comprises a power adapter, a redundant power supply module, and a power switching module, wherein an output of the power adapter is connected to inputs of the redundant power supply module and the power switching module, an output of the redundant power supply module is connected to an input of the power switching module, and the power switching module is configured to switch to either the power adapter or the redundant power supply module.
8. The pressure switch sensor detection device of claim 7, wherein the redundant power supply module comprises two paths of battery modules, and any path of the battery modules comprises a battery charging management unit, a battery charging protection unit, a battery discharging protection unit and a battery boosting unit which are sequentially arranged.
9. A pressure switch sensor detecting method using the pressure switch sensor detecting device according to claim 8, comprising the steps of,
step 1, initializing, step 2, judging whether checking is carried out or not, if so, carrying out checking processing firstly, carrying out power management after the checking processing, if not, directly carrying out power management, step 3, carrying out pressure measurement to obtain the pressure value, and step 4, displaying the pressure value.
10. The pressure switch sensor detection device of claim 9 wherein said verification process includes the steps of, step 2.1, determining whether a port of said pressure switch sensor interface module is live;
step 2.11, if the voltage is not charged, switching to a resistance gear, memorizing the current state of the pressure switch sensor, step 2.12, judging whether the state of the pressure switch sensor changes within a specified time, step 2.13, if the state of the pressure switch sensor changes, immediately acquiring the pressure value of the pressure switch sensor, locking the pressure value, displaying the pressure value on a display module, giving out a prompt tone, and if the state of the pressure switch sensor does not change, returning to the step 2.11;
and 2.21, if the voltage is charged, switching to a voltage gear, memorizing the current state of the pressure switch sensor, 2.22, judging whether the state of the pressure switch sensor changes within a specified time, 2.23, if the state of the pressure switch sensor changes, immediately acquiring the pressure value of the pressure switch sensor, locking the pressure value, displaying the pressure value on a display module, giving out a prompt tone, and if the state of the pressure switch sensor does not change, returning to the step 2.21.
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| CN205864058U (en) * | 2016-07-14 | 2017-01-04 | 深圳光启空间技术有限公司 | Redundant power for UAS |
| CN209707658U (en) * | 2019-03-26 | 2019-11-29 | 国网陕西省电力公司检修公司 | Pressure switch calibration equipment |
| CN211347212U (en) * | 2019-11-18 | 2020-08-25 | 长春理工大学 | Fast detection device of full-bridge pressure sensor |
| CN213120964U (en) * | 2020-10-10 | 2021-05-04 | 南方电网调峰调频发电有限公司检修试验分公司 | Pressure switch sensor detection device |
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