Intelligent vacuum degree test recorder

Abstract

A kind of vacuum degree intelligent test recorder belongs to industrial detection and automation control technical field.It includes single-chip microcomputer, measurement function module group for realizing multiple physical quantity measurement, RTC real-time clock module for providing accurate date and time information, user instruction input unit for man-machine interaction and storage unit for data export, the measurement function module group includes environment measurement module, temperature measurement module, AC current clamp-on ammeter and pressure sensor, environment measurement module is connected with single-chip microcomputer by IIC bus communication, temperature measurement module is connected with single-chip microcomputer by SPI bus communication, the AC current clamp-on ammeter is connected with single-chip microcomputer by 485 interface communication, the pressure sensor is connected with single-chip microcomputer by IIC bus communication after passing through A / D conversion chip, the user instruction input unit includes touch screen.The advantages are: multiple parameter data acquisition and large measurement accuracy, wide measurement range.

Description

Technical Field

[0001] This utility model belongs to the field of industrial testing and automation control technology, specifically relating to a vacuum degree intelligent test recorder. Background Technology

[0002] Vacuum pressure gauges, as key instruments for measuring vacuum or negative pressure environments, are widely used in industrial process control, laboratory testing, and equipment condition monitoring. Currently, the most common vacuum pressure gauges on the market are mainly divided into two types: pointer type and digital display type. The typical range of pointer-type vacuum pressure gauges is -0.1 to 0 MPa, with a minimum scale division of 2 kPa. These instruments have a simple structure and low cost, enabling basic visual pressure monitoring; however, they rely on manual reading of the pointer position, which can easily introduce parallax errors, and they lack electrical signal output functionality, making them unsuitable for connection to automation systems and difficult to meet the needs of data recording or remote monitoring. Digital display vacuum pressure gauges also have a range of -0.1 to 0 MPa, but with higher resolution and a minimum scale division of 0.1 kPa. These instruments typically have two digital outputs and one analog output (1–5V), thus enabling simple control logic (such as over-limit alarms or start / stop control), and offer a higher level of automation than pointer-type gauges. However, existing digital vacuum pressure gauges are still relatively simple in function, have low measurement accuracy, and usually lack data storage, communication or advanced analysis capabilities, which cannot meet the application needs of digital processing applications.

[0003] In view of the aforementioned existing technology, the applicant has made beneficial designs, and the technical solutions to be introduced below are produced in this context. Utility Model Content

[0004] The purpose of this invention is to provide a portable, intelligent vacuum test recorder that can acquire multiple parameters and has high measurement accuracy.

[0005] The purpose of this invention is to provide a vacuum degree intelligent test recorder, comprising a microcontroller, a measurement function module group for measuring multiple physical quantities, an RTC real-time clock module for providing accurate date and time information, a user command input unit for human-computer interaction, and a storage unit for data export. The measurement function module group includes an environmental measurement module, a temperature measurement module, an AC current clamp meter, and a pressure sensor. The environmental measurement module communicates with the microcontroller via an IIC bus, the temperature measurement module communicates with the microcontroller via an SPI bus, the AC current clamp meter communicates with the microcontroller via a 485 interface, and the pressure sensor communicates with the microcontroller via an IIC bus after passing through an A / D conversion chip. The RTC real-time clock module includes an RTC chip and a backup battery; the RTC chip communicates with the microcontroller via an IIC bus. The user command input unit includes a touchscreen that communicates with the microcontroller via a UART serial port. The storage unit includes a USB flash drive and a USB flash drive management and control chip. The USB flash drive management and control chip connects to the USB flash drive via a USB interface and communicates with the microcontroller via an SPI bus.

[0006] In a specific embodiment of this utility model, the environmental measurement module is used to measure atmospheric pressure, ambient temperature and humidity; the temperature measurement module is used to measure the cooling water temperature inside the vacuum pump; and the AC current clamp meter is used to measure the motor operating current.

[0007] In another specific embodiment of this utility model, the pressure sensor has two channels. The two pressure sensors use different strain materials and measurement mechanisms to generate different output voltages. After voltage division, one of the pressure sensors is connected to the A / D conversion chip.

[0008] In another specific embodiment of this utility model, the time information provided by the RTC real-time clock module includes: year, month, day, hour, minute, second, and weekday.

[0009] In another specific embodiment of this utility model, the user instruction input unit further includes buttons and indicator lights connected to the microcontroller via I / O ports. The buttons are used to input instructions, while the indicator lights provide corresponding status feedback.

[0010] In another specific embodiment of this utility model, a power management unit is also included. The power management unit includes a lithium battery, a charging and discharging module, a charging interface, and a boost module. The charging and discharging module charges the lithium battery through the charging interface and stabilizes and boosts the battery voltage to power the microcontroller. The boost module is used to boost the voltage output by the charging and discharging module to power the two pressure sensors and the AC current clamp meter.

[0011] In a further specific embodiment of this utility model, the microcontroller is an STC microcontroller.

[0012] In a further specific embodiment of this utility model, a housing is also included, in which the microcontroller, measurement function module group, user command input unit, storage unit, RTC real-time clock module and power management unit are housed.

[0013] Due to the adoption of the above-mentioned structure, this utility model has the following advantages compared with the prior art: In terms of measurement function, it can simultaneously measure multiple physical quantities related to the vacuum pump system, and the measurement accuracy is high and the measurement range is large; in terms of display function, it can display the measurement results in various ways such as curves and tables through different interfaces of the touch screen; in terms of storage function, the measurement time and measurement results can be saved in CSV table format to a USB flash drive when needed, which is convenient for data analysis; the overall structure is compact, easy to operate, and has good portability. Attached Figure Description

[0014] Figure 1 This is a circuit block diagram of the present invention. Detailed Implementation

[0015] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0016] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0017] See Figure 1 This utility model relates to a vacuum degree intelligent test recorder, comprising: an STC microcontroller as the core control unit; a power management unit for powering various modules; a measurement function module group for realizing the measurement of multiple physical quantities, specifically including an environmental measurement module, a temperature measurement module, an AC current measurement module, and a pressure sensor; an RTC real-time clock module for providing accurate date and time information, including an RTC chip and a backup battery; a user command input unit for human-machine interaction, including a touch screen, buttons, and indicator lights; a storage unit for data export, including a USB flash drive management control chip and a USB flash drive; and an interface circuit for inter-module communication.

[0018] This utility model is an intelligent data acquisition and storage device with an STC microcontroller as the control core. Its working principle can be summarized as follows: the STC microcontroller uniformly schedules each module to acquire data. The processed data can be used for real-time human-computer interaction through a touch screen, or it can be independently stored on a USB flash drive through a dedicated USB flash drive management and control chip to achieve offline data export. The power management unit includes a high-capacity 3.7V lithium battery, a charging / discharging module, a charging interface, and a boost module. This embodiment uses a 3.7V lithium battery to power the entire system, with a charging / discharging module responsible for safely charging the battery. Power first passes through the charging / discharging module, charging the battery via a universal Type-C interface for ease of use, and simultaneously boosting the battery voltage to a stable 5V to power the microcontroller and most peripheral modules. The 5V voltage then passes through a boost module to generate a high-precision 15V voltage, specifically designed to power the two pressure sensors and AC current clamp meter that require higher operating voltages, ensuring their measurement accuracy and stability. This design ensures the recorder can operate continuously for extended periods without an external power source, offering excellent portability.

[0019] The environmental measurement module employs an integrated sensor (such as the MBE280) and communicates with the STC microcontroller via an IIC bus. This module simultaneously measures atmospheric pressure, ambient temperature, and humidity, with typical measurement ranges of: temperature -40 to 85°C (accuracy ±1°C), humidity 0 to 100%RH (accuracy ±3%), and pressure 300 to 1100 hPa (accuracy ±1 hPa). The temperature measurement module uses a dedicated chip (such as MAX31865) in conjunction with a PT100 platinum resistance temperature sensor and communicates with the STC microcontroller via an SPI bus. This module is specifically designed to measure the temperature of the cooling water inside the vacuum pump, with a measurement range of 0–200°C and an accuracy maintained within 0.5°C (equivalent to 0.05% of full scale) throughout the entire range.

[0020] The aforementioned AC current clamp meter is used to measure the operating current of a motor. It communicates with an STC microcontroller via a 485 interface. Its range is 100A and its resolution can reach 0.1A. It is used for non-contact measurement of the operating current of a vacuum pump motor.

[0021] This invention allows for the selection of two pressure sensors with different strain materials and measurement mechanisms to generate different output voltages, depending on the required measurement accuracy and range. After voltage division, one of the pressure sensors is connected to the aforementioned A / D conversion chip. The weak millivolt-level signal output by the pressure sensor is sampled by an 18-bit high-precision, high-speed A / D conversion chip, and then the digital signal is transmitted to the STC microcontroller via the IIC bus. The selection of a high-performance external A / D conversion chip ensures the accuracy of the measurement results. This design enables the pressure measurement range to span six orders of magnitude from E+5 to E-1, and can accurately distinguish mV-level signal changes from the sensor, resulting in high measurement accuracy and a large measurement range.

[0022] The aforementioned RTC real-time clock module employs a low-power, multi-functional clock / calendar dedicated RTC chip (PCF8563) and a 3V backup button battery. This RTC chip connects to the STC microcontroller via an IIC interface. When the power is off, the backup battery supplies power to the RTC chip to maintain normal clock operation. The RTC real-time clock module can provide time information such as year, month, day, hour, minute, second, and day of the week.

[0023] This invention also features a user command input function. Users can operate the device via a touchscreen connected to a UART serial port or input commands via physical buttons directly connected to the microcontroller's I / O port. Indicator lights provide corresponding status feedback. The user command input unit uses a 4.3-inch serial touchscreen as the display device, with a resolution of 800×400, offering clear display and low power consumption. The touchscreen communicates with the STC microcontroller via UART. The STC microcontroller sends processed measurement data to the touchscreen, which can display the measurement results in tables or curves on different interfaces according to user commands. In addition, the casing also has a few physical buttons and status indicator lights to supplement the touch operation.

[0024] The storage function of the aforementioned storage unit is implemented by a USB flash drive management and control chip. This chip connects to the USB flash drive via a USB interface and communicates with the STC microcontroller via SPI. When the user needs to record data, the STC microcontroller can save the measurement time and results in CSV table format to the USB flash drive. This format facilitates subsequent processing using various data analysis software (such as Excel) on a computer. The USB flash drive management and control chip can be the classic and commonly used CH376T. All the aforementioned unit modules are housed within a compact housing. Operation buttons, indicator lights, and a Type-C charging port are located on the front panel, while external sensor interfaces are located on the rear panel. The overall structure is compact, facilitating portability and on-site operation. In this embodiment, the housing dimensions are approximately 150mm × 120mm × 40mm.

[0025] The core principle of this invention is "centralized control, distributed data acquisition, and unified storage." The STC microcontroller is responsible for overall control, coordinating the power supply, sensors, human-machine interface, and storage unit. It can simultaneously measure multiple physical quantities related to the vacuum pump system, including environmental conditions, vacuum pressure, motor operating current, and vacuum pump body temperature. It achieves high-precision acquisition of multi-parameter data, user-friendly human-computer interaction, and convenient independent data export function, thus forming a complete and practical intelligent monitoring system and achieving the invention objective.

Claims

1. A vacuum degree intelligent test recorder, characterized in that: The system includes a microcontroller, a measurement function module group for measuring multiple physical quantities, an RTC real-time clock module for providing accurate date and time information, a user command input unit for human-computer interaction, and a storage unit for data export. The measurement function module group includes an environmental measurement module, a temperature measurement module, an AC current clamp meter, and a pressure sensor. The environmental measurement module communicates with the microcontroller via an IIC bus, the temperature measurement module communicates with the microcontroller via an SPI bus, the AC current clamp meter communicates with the microcontroller via a 485 interface, and the pressure sensor communicates with the microcontroller via an IIC bus after passing through an A / D converter chip. The RTC real-time clock module includes an RTC chip and a backup battery; the RTC chip communicates with the microcontroller via an IIC bus. The user command input unit includes a touchscreen that communicates with the microcontroller via a UART serial port. The storage unit includes a USB flash drive and a USB flash drive management and control chip. The USB flash drive management and control chip connects to the USB flash drive via a USB interface and communicates with the microcontroller via an SPI bus.

2. The intelligent vacuum test recorder according to claim 1, characterized in that: The environmental measurement module is used to measure atmospheric pressure, ambient temperature, and humidity; the temperature measurement module is used to measure the cooling water temperature inside the vacuum pump; and the AC current clamp meter is used to measure the motor operating current.

3. The intelligent vacuum test recorder according to claim 1, characterized in that: The pressure sensor has two channels, which use different strain materials and measurement mechanisms to generate different output voltages. After voltage division, one of the pressure sensors is connected to the A / D conversion chip.

4. The intelligent vacuum test recorder according to claim 1, characterized in that: The time information provided by the RTC real-time clock module includes: year, month, day, hour, minute, second, and weekday.

5. The intelligent vacuum test recorder according to claim 1, characterized in that: The user instruction input unit also includes buttons and indicator lights connected to the microcontroller via I / O ports. The buttons are used to input instructions, while the indicator lights provide corresponding status feedback.

6. The intelligent vacuum test recorder according to claim 1, characterized in that: It also includes a power management unit, which includes a lithium battery, a charging and discharging module, a charging interface, and a boost module. The charging and discharging module charges the lithium battery through the charging interface and boosts the battery voltage to power the microcontroller. The boost module boosts the voltage output by the charging and discharging module to power the two pressure sensors and the AC current clamp meter.

7. The intelligent vacuum test recorder according to claim 1, characterized in that: The microcontroller mentioned is an STC microcontroller.

8. The intelligent vacuum test recorder according to claim 1, characterized in that: It also includes a housing, in which the microcontroller, measurement function module group, user command input unit, storage unit, RTC real-time clock module and power management unit are housed.

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