Digital multi-path differential pressure gauge module

Abstract

The utility model belongs to the technical field of environment-friendly air purification, and discloses a digital multi-path differential pressure gauge module. Comprising a multi-path differential pressure gauge module shell. A liquid crystal display screen is arranged on the outer surface of a shell of the multi-path differential pressure gauge module, an LED display area used for displaying the state of a filter cartridge is arranged on one side of the liquid crystal display screen, a PCB is arranged in the shell of the multi-path differential pressure gauge module, a single-chip microcomputer control chip circuit is arranged on the PCB, and the single-chip microcomputer control chip circuit is connected with the output end of an analog-to-digital conversion circuit to achieve differential pressure data processing. The analog-to-digital conversion circuit is connected with the voltage difference acquisition circuit to obtain voltage difference data, and the single-chip microcomputer control chip circuit is respectively connected with a communication circuit used for connecting acquired signals with external transmission, a storage circuit used for storage, a key circuit used for parameter setting, and an LED indication circuit used for working / early warning / alarm prompting. The problems that an existing mechanical differential pressure gauge is low in sensitivity, replacement of a filter element and whether quantitative data is lacked or not depend on experience, a digital interface is not provided, and communication with a PLC cannot be achieved are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection air purification and relates to a digital multi-channel differential pressure meter module. Background Art

[0002] In the field of air environmental protection and purification, fans are generally used for filtering. The filtering efficiency depends on the filter element. As the working time increases, the adsorbents in the filter element increase, the purification effect will be greatly reduced, and the energy consumption will be greatly increased. Therefore, a single or multiple mechanical differential pressure gauges are often used to detect the pressure growth of the fan. According to the pressure growth of the mechanical differential pressure gauge, the personnel rely on experience to replace or purge the filter element. The mechanical differential pressure gauge has the problems of low sensitivity and non-intuitive display. The differential pressure data cannot be recorded paperlessly and connected to the on-site PLC equipment.

[0003] The conventional single-channel digital differential pressure gauge is used to transform the mechanical differential pressure gauge in the industrial field, but it is not suitable for differential pressure threshold detection and has limited installation space, which is not conducive to promotion. It is urgent to develop a multi-channel, high-precision digital multi-channel differential pressure gauge module with a digital communication interface and the ability to set differential pressure thresholds. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the above-mentioned background technology and to provide a digital multi-channel differential pressure gauge module, which solves the problems of low sensitivity of the previous mechanical differential pressure gauges, lack of quantitative data for filter element replacement and purging, which depends entirely on experience, lack of digital interface, and inability to communicate with PLCs, etc.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a digital multi-channel differential pressure gauge module, comprising a multi-channel differential pressure gauge module shell; a liquid crystal display screen is arranged on the outer surface of the multi-channel differential pressure gauge module shell, an LED display area for displaying the status of the filter cartridge is arranged on one side of the liquid crystal display screen, a PCB board is arranged in the multi-channel differential pressure gauge module shell, a single-chip microcomputer control chip circuit is arranged on the PCB, the single-chip microcomputer control chip circuit is connected to the output end of the analog-to-digital conversion circuit to realize the processing of differential pressure data, the analog-to-digital conversion circuit obtains the differential pressure data by connecting to the differential pressure acquisition circuit, and the single-chip microcomputer control chip circuit is respectively connected to a communication circuit for connecting the acquired signal to the external transmission, a storage circuit for storage, a key circuit for parameter setting, and an LED indication circuit for work / early warning / alarm prompts.

[0006] The pressure difference acquisition circuit is connected to three pressure difference signal acquisition sensors; the pressure difference signal acquisition sensor is connected to the filter element through the air pressure pipeline interface and the hose. The pressure difference signal acquisition sensor adopts a silicon piezoresistive pressure sensitive chip, and generates a weak differential signal through high pressure and low pressure input.

[0007] The single-chip microcomputer control chip circuit is connected to the power circuit, and the analog-to-digital conversion circuit is connected to the power circuit.

[0008] The LED display area uses green, yellow and red LEDs to intuitively display the life status of the filter cartridge. The LCD screen uses a 12864 LCD screen to display the current real-time pressure difference and function menu.

[0009] A power indicator light for displaying the current power supply status is also provided on the surface of the multi-channel differential pressure gauge module housing.

[0010] A key area for operating and setting parameters is also provided on the housing surface of the multi-channel differential pressure gauge module.

[0011] The single-chip microcomputer control chip circuit is also connected to an EEPROM circuit for realizing data storage and reading.

[0012] The single-chip microcomputer control chip circuit is also connected to a SWD download interface for data downloading.

[0013] The single-chip microcomputer control chip circuit and the main control chip circuit are also connected to an LCD interface circuit for displaying on an external display screen.

[0014] The single-chip microcomputer control chip circuit is also connected to a single-chip microcomputer crystal oscillator circuit for controlling the running rhythm.

[0015] The chip in the single-chip microcomputer control chip circuit is the STM32F103C6T6 chip.

[0016] The communication circuit is an RS485 communication circuit.

[0017] EEPROM (Electrically Erasable Programmable Read-Only Memory) is used to store and read data. It is used to read and write configuration parameters such as sensor gain and drift parameters, alarm thresholds of each channel, etc., and can be saved when power is off.

[0018] The analog-to-digital conversion circuit is also connected to a digital-to-analog power processing circuit for converting digital signals into circuit signals.

[0019] The chip in the analog-to-digital conversion circuit is a 24BIT delta-sigmaADS1256 chip.

[0020] The power supply circuit includes a 5V voltage stabilizing circuit, which is connected to the power supply terminal and is electrically connected to a power supply board or an external power supply through the power supply terminal.

[0021] The module is soldered using medium temperature tin paste.

[0022] The hose is anti-oxidation hard silicone hose.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model provides a digital multi-channel differential pressure gauge module, which solves the problems of low sensitivity of the conventional mechanical differential pressure gauge, lack of quantitative data for filter element replacement and purging, which depends entirely on experience, lack of digital interface, and inability to communicate with PLC and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 The utility model is a schematic diagram of the module structure of a digital multi-channel differential pressure meter.

[0027] Figure 2 The utility model is a digital multi-channel differential pressure meter module connection schematic diagram.

[0028] Figure 3 The utility model is a circuit diagram of a single-chip microcomputer control chip.

[0029] Figure 4 This is a communication circuit diagram of the utility model.

[0030] Figure 5 The utility model is an analog-to-digital conversion circuit diagram.

[0031] Figure 6 This is a circuit diagram of a power supply terminal of the utility model.

[0032] Figure 7 This is a power supply circuit diagram of the utility model.

[0033] Figure 8 This is a LDO circuit diagram of the utility model.

[0034] Fig. 9 This is a digital-analog power supply processing circuit diagram of the utility model.

[0035] Fig.10 The utility model is a key circuit diagram.

[0036] Fig.11 It is the LED indication circuit diagram.

[0037] In the figure, 1. multi-channel differential pressure gauge module housing, 2. LED display area, 3. LCD display screen, 4. power indicator light, 5. air pressure pipeline interface, 6. key area. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

[0039] Example 1

[0040] A digital multi-channel differential pressure meter module, such as Figure 1-Figure 10As shown, it includes a multi-channel differential pressure gauge module housing 1; a liquid crystal display screen 3 is arranged on the outer surface of the multi-channel differential pressure gauge module housing 1, and an LED display area 2 for displaying the status of the filter cartridge is arranged on one side of the liquid crystal display screen 3; a PCB board is arranged in the multi-channel differential pressure gauge module housing 1, and a single-chip microcomputer control chip circuit is arranged on the PCB, and the single-chip microcomputer control chip circuit is connected to the output end of the analog-to-digital conversion circuit to realize the processing of the differential pressure data, and the analog-to-digital conversion circuit obtains the differential pressure data by connecting to the differential pressure acquisition circuit, and the single-chip microcomputer control chip circuit is respectively connected to a communication circuit for connecting the collected signal to the external transmission, a storage circuit for storage, a key circuit for parameter setting, and an LED indication circuit for work / early warning / alarm prompts.

[0041] The pressure difference acquisition circuit is connected to three pressure difference signal acquisition sensors; the pressure difference signal acquisition sensor is connected to the filter element through the air pressure pipeline interface 5 and the hose. The pressure difference signal acquisition sensor adopts a silicon piezoresistive pressure sensitive chip, which generates a weak differential signal through high pressure and low pressure input.

[0042] The single-chip microcomputer control chip circuit is connected to the power circuit, and the analog-to-digital conversion circuit is connected to the power circuit.

[0043] The LED display area uses green, yellow and red LEDs to intuitively display the life status of the filter cartridge. The LCD screen uses a 12864 LCD screen to display the current real-time pressure difference and function menu.

[0044] A power indicator light 4 for displaying the current power supply status is also provided on the surface of the multi-channel differential pressure gauge module housing 1 .

[0045] A key area 6 for operating and setting parameters is also provided on the surface of the multi-channel differential pressure gauge module housing 1 .

[0046] The single-chip microcomputer control chip circuit is also connected to an EEPROM circuit for realizing data storage and reading.

[0047] The single-chip microcomputer control chip circuit is also connected to a SWD download interface for data downloading.

[0048] The single-chip microcomputer control chip circuit and the main control chip circuit are also connected to an LCD interface circuit for displaying on an external display screen.

[0049] The single-chip microcomputer control chip circuit is also connected to a single-chip microcomputer crystal oscillator circuit for controlling the running rhythm.

[0050] The chip in the single-chip microcomputer control chip circuit is the STM32F103C6T6 chip.

[0051] The communication circuit is an RS485 communication circuit.

[0052] EEPROM (Electrically Erasable Programmable Read-Only Memory) is used to store and read data. It is used to read and write configuration parameters such as sensor gain and drift parameters, alarm thresholds of each channel, etc., and can be saved when power is off.

[0053] The analog-to-digital conversion circuit is also connected to a digital-to-analog power processing circuit for converting digital signals into circuit signals.

[0054] The chip in the analog-to-digital conversion circuit is a 24BIT delta-sigmaADS1256 chip.

[0055] The power supply circuit includes a 5V voltage stabilizing circuit, which is connected to the power supply terminal and is electrically connected to a power supply board or an external power supply through the power supply terminal.

[0056] The module is soldered using medium temperature tin paste.

[0057] The hose is anti-oxidation hard silicone hose.

[0058] The single-chip control chip circuit uses the STM32F103C8T6 based on the Cortex-M3 core from STMicroelectronics (ST), which has a main frequency of 72MHZ and is used to implement all algorithms and communication functions.

[0059] The LCD screen 3 uses a 12864 dot matrix COG LCD screen 3, which communicates with the single-chip control chip circuit through the serial port interface to realize the basic functions such as the display of differential pressure data and menu logic display. At the same time, each channel includes 3 F5 direct-plug LED lights of different colors (i.e., as LED display areas), which respectively indicate the status of the current channel filter element, i.e., normal, replacement, and alarm.

[0060] The module has Modbus communication capabilities that meet the requirements of industrial environments, and can communicate with PLCs, computer hosts, etc., so that it can be connected to the factory intelligent platform and achieve centralized management and control. The module can compare the pressure difference thresholds set in the LED display area menu with the current real-time pressure, drive three sets of LED indicators, and display the fan filter status very intuitively, solving the problem of the previous mechanical pressure difference gauge display being not intuitive.

[0061] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A digital multi-channel differential pressure meter module, characterized in that: The invention comprises a multi-channel differential pressure gauge module housing (1); a liquid crystal display screen (3) is arranged on the outer surface of the multi-channel differential pressure gauge module housing (1); an LED display area (2) for displaying the status of a filter cartridge is arranged on one side of the liquid crystal display screen (3); a PCB board is arranged inside the multi-channel differential pressure gauge module housing (1); a single-chip control chip circuit is arranged on the PCB; the single-chip control chip circuit is connected to the output end of an analog-to-digital conversion circuit to realize the processing of differential pressure data; the analog-to-digital conversion circuit obtains differential pressure data by connecting to a differential pressure acquisition circuit; the single-chip control chip circuit is respectively connected to a communication circuit for connecting the acquired signal to an external transmission, a storage circuit for storage, a key circuit for parameter setting, and an LED indication circuit for operation / early warning / alarm prompts.

2. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: The pressure difference acquisition circuit is connected to three pressure difference signal acquisition sensors; the pressure difference signal acquisition sensors are connected to the filter core through an air pressure pipeline interface (5) and a rubber hose.

3. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: The single-chip microcomputer control chip circuit is connected to the power supply circuit.

4. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: The analog-to-digital conversion circuit is connected to the power supply circuit.

5. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: A power indicator light (4) for displaying the current power supply status is also provided on the surface of the multi-channel differential pressure gauge module housing (1).

6. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: A key area (6) for operating and setting parameters is also provided on the surface of the multi-channel differential pressure gauge module housing (1).

7. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: The single-chip microcomputer control chip circuit is also connected to a single-chip microcomputer crystal oscillator circuit for controlling the running rhythm.

8. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: The single-chip microcomputer control chip circuit is also connected to an EEPROM circuit for realizing data storage and reading.

9. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: The single-chip microcomputer control chip circuit is also connected to a SWD download interface for data downloading.

10. A digital multi-channel differential pressure meter module as claimed in claim 1, characterized in that: The analog-to-digital conversion circuit is also connected to a digital-to-analog power processing circuit for converting digital signals into circuit signals.

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