CN221803885U - Oil conductivity measuring instrument - Google Patents

Abstract

The utility model discloses an oil product conductivity measuring instrument which comprises a man-machine interaction module, a microcontroller module, a data acquisition module, a conductivity sensor module, a temperature and humidity module and a power module; the microcontroller module is respectively connected with the man-machine interaction module, the data acquisition module and the temperature and humidity module in a communication way, the signal output end of the conductivity sensor module is connected with the signal input end of the data acquisition module, and the power supply module provides required power supply voltage for each module of the oil product conductivity measuring instrument; the data acquisition module comprises a current-to-voltage circuit, a filter and an ADC data acquisition device, wherein the current-to-voltage circuit, the filter and the ADC data acquisition device are sequentially connected, a signal input end of the current-to-voltage circuit is connected with a signal output end of the conductivity sensor module, a signal output end of the ADC data acquisition device is connected with the microcontroller module, and a shielding body is arranged on the data acquisition module. The utility model solves the problems of inaccurate measurement and unstable measurement of the oil product conductivity.

Description

An oil conductivity measuring instrument

Technical Field

The utility model relates to the technical field of detection devices, in particular to an oil conductivity measuring instrument.

Background Art

At present, some existing oil conductivity meters on the market have a long measurement time, which causes the electrode of the conductivity measurement sensor to be polarized in the oil, thus affecting the accuracy of the oil conductivity measurement. Some other oil conductivity meters are susceptible to interference from noise signals such as external electromagnetic fields, resulting in large fluctuations in the measurement data, that is, unstable measurements. In addition, the conductivity of oil is greatly affected by the temperature and humidity of the surrounding environment. Existing oil conductivity meters do not have the temperature and humidity measurement function, resulting in inaccurate conductivity measurements of oil.

In summary, the existing oil conductivity measurement devices on the market currently have problems such as inaccurate measurement data caused by electrode polarization of the conductivity measurement sensor and the influence of ambient temperature and humidity, and large data fluctuations during continuous measurement.

Utility Model Content

The utility model aims at the above problems, makes up for the deficiencies of the prior art, and provides an oil conductivity measuring instrument to solve the above problems of inaccurate and unstable measurement of oil conductivity.

To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an oil conductivity measuring instrument, comprising a human-computer interaction module, a microcontroller module, a data acquisition module, a conductivity sensor module, a temperature and humidity module, and a power supply module; the microcontroller module is respectively connected to the human-computer interaction module, the data acquisition module, and the temperature and humidity module for mutual communication, the signal output end of the conductivity sensor module is connected to the signal input end of the data acquisition module, and the power supply module provides the required power supply voltage for each module of the oil conductivity measuring instrument; the data acquisition module comprises a current-to-voltage circuit, a filter, and an ADC data collector, which are connected in sequence, the signal input end of the current-to-voltage circuit is connected to the signal output end of the conductivity sensor module, the signal output end of the ADC data collector is connected to the microcontroller module, and a shielding body is installed on the data acquisition module.

As a preferred solution of the present utility model, the microcontroller module adopts any one of a single chip microcomputer and a FPGA.

As another preferred solution of the present invention, the human-computer interaction module adopts any one of a touch screen and an LCD display screen with buttons.

As another preferred solution of the present invention, the power module adopts any one of a voltage stabilizing chip and a DC-DC power supply chip.

As another preferred solution of the present invention, the temperature and humidity module adopts any one of a humidity collection chip and a temperature and humidity sensor.

Compared with the prior art, the beneficial effects of the utility model are as follows: the oil conductivity measuring instrument uses a microcontroller module as the main control core and combines a human-computer interaction module, a conductivity sensor module, and a temperature and humidity module to measure the conductivity of the oil. At the same time, a shielding body is provided for the data acquisition module used in conjunction with the conductivity sensor module, so that the utility model has the following advantages: (1) fast measurement and simple operation. The measuring instrument can start measurement without baseline calibration, and the measurement time does not exceed 1.5s; (2) the measurement data is accurate and the data fluctuation is small; (3) the oil conductivity data can be corrected according to the temperature and humidity values detected by the temperature and humidity module, so that the conductivity measurement result of the oil is more accurate.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic block diagram of the structure of an oil conductivity measuring instrument according to the present invention;

FIG2 is a schematic block diagram of the structure of a data acquisition module of an oil conductivity measuring instrument according to the present invention;

Markings in the figure: 101 is a human-computer interaction module, 102 is a microcontroller module, 103 is a data acquisition module, 104 is a conductivity sensor module, 105 is a temperature and humidity module, 106 is a power module, 301 is a current-to-voltage circuit, 302 is a filter, 303 is an ADC data collector, and 304 is a shield.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Please refer to Figures 1 and 2. An oil conductivity measuring instrument provided by an embodiment of the utility model is composed of a human-computer interaction module 101, a microcontroller module 102, a data acquisition module 103, a conductivity sensor module 104, a temperature and humidity module 105, and a power supply module 106.

Among them: the human-computer interaction module 101 is used to receive the input information of the measurement operator and display the feedback information of the measuring instrument, thereby realizing the human-computer interaction function in the measurement process; the microcontroller module 102 is used to exchange information and control with the human-computer interaction module 101, the data acquisition module 103, and the temperature and humidity module 105; the data acquisition module 103 is used to collect the current signal output by the conductivity sensor module 104; the conductivity sensor module 104 is used to convert the conductivity value of the oil product into a corresponding current signal; the temperature and humidity module 105 is used to measure the temperature and humidity information of the environment surrounding the oil product, and send the collected information to the microcontroller module 102, so that the microcontroller module 102 can correct the measured value of the oil product conductivity according to the current temperature and humidity information; the power supply module 106 is used to provide the power supply voltage required by the human-computer interaction module 101, the microcontroller module 102, the data acquisition module 103, the conductivity sensor module 104, and the temperature and humidity module 105, so that the measuring instrument can operate normally.

The human-computer interaction module 101 may be a touch screen or an LCD display screen with buttons to facilitate information interaction between the user and the microcontroller module 102 .

The microcontroller module 102 can be implemented by using electronic devices with data calculation and communication functions such as single-chip microcomputers and FPGAs. As long as they have instruction control and communication functions, they can be used to implement the microcontroller module 102.

The data acquisition module 103 is mainly composed of a current-to-voltage circuit 301, a filter 302, and an ADC data collector 303; wherein the current-to-voltage circuit 301 can be composed of an operational amplifier or discrete components (such as transistors) with capacitors and resistors, and is used to convert the current signal output by the conductivity sensor module 104 into an easily measurable voltage signal; the ADC data collector 303 is used to collect the voltage signal output by the current-to-voltage circuit 301 and convert it into a digital signal, and send the collected digital signal of the voltage value result to the microcontroller module 102.

The conductivity sensor module 104 is used to convert the conductivity value of the oil into a corresponding current signal, and transmit the current signal to the data acquisition module 103 for further processing.

The temperature and humidity module 105 can be composed of an integrated temperature and humidity chip or a temperature and humidity sensor plus a peripheral circuit, and is mainly used to measure the temperature and humidity of the environment surrounding the oil product and communicate with the microcontroller module 102.

The power module 106 may adopt an LDO type voltage regulator chip or a DC-DC power supply chip to achieve the output of a specified voltage.

Specifically, referring to FIG1 , the human-computer interaction module 101 is connected to the microcontroller module 102. The human-computer interaction module 101 is used to obtain the input information of the measurement operator and display the feedback information of the measuring instrument, thereby realizing the human-computer interaction function in the measurement process, sending the input information of the measurement operator to the microcontroller module 102, receiving the information of the microcontroller module 102, and displaying it to the measurement operator; the conductivity sensor module 104 is connected to the data acquisition module 103, and converts the conductivity value of the measured oil product into a corresponding current signal in real time; the data acquisition module 103 is respectively connected to the microcontroller module 102 and the conductivity sensor module 104, converts the current signal output by the conductivity sensor module 104 into a voltage signal and collects it in real time, and then transmits the collected voltage value to the microcontroller module 102, and calculates and processes it in the microcontroller module 102 to finally obtain the conductivity value of the oil product; the temperature and humidity module 105 is connected to the microcontroller module 102.

Specifically, referring to FIG. 2, FIG. 2 shows a schematic block diagram of the structure of the data acquisition module 103 of the utility model. The data acquisition module 103 is connected to the microcontroller module 102 and the conductivity sensor module 104 respectively, and the current signal output by the conductivity sensor module 104 is received into the current-to-voltage circuit 301 for conversion. The converted voltage signal is filtered by the filter 302, which can effectively attenuate the electromagnetic field interference of space and power frequency, so that the signal-to-noise ratio of the useful voltage signal becomes higher. Under the control of the microcontroller module 102, the ADC data acquisition device 303 at the rear end of the filter 302 collects the voltage signal output after the conversion of the current-to-voltage circuit 301 in real time, and transmits the voltage value to the microcontroller module 102. In order to further shield the external electromagnetic field interference, the data acquisition module 103 is also provided with a shielding body 304, which can make the measurement result more accurate and less volatile.

The following is a detailed explanation of the embodiment of the utility model. The microcontroller module 102 uses the STM32F407 single-chip microcomputer chip as the main control chip, and the power module 106 uses the three-terminal voltage regulator chip LM2937, which can generate a +3.3V voltage to power the human-computer interaction module 101, the microcontroller module 102, the data acquisition module 103, the conductivity sensor module 104, and the temperature and humidity module 105 inside the oil conductivity measuring instrument. The temperature and humidity module 105 uses the SHT31 temperature and humidity acquisition chip to realize the temperature and humidity measurement function, and is connected to the microcontroller module 102 through the IIC method. The conductivity sensor module 104 is a general conductivity cell, which is connected to the data acquisition module 103. The current-to-voltage circuit 301 in the data acquisition module 103 can be implemented by using a low-noise, low-bias current op amp with a high-resistance resistor; the filter 302 uses a general anti-aliasing filter, which can be implemented by resistors and capacitors; the ADC data acquisition device 303 can be implemented by using ADI's 24-bit ADC data acquisition chip with an external reference voltage source; the shielding body 304 can be implemented by using a general metal shielding cover. The human-computer interaction module 101 uses a combination of a universal encoder and a silicone key to realize the key and knob functions, and is connected to the microcontroller module 102 via GPIO; the LCD12864 module is used to realize the information display function, and is connected to the microcontroller module 102 via a parallel port.

The utility model utilizes a low-cost microcontroller module 102, a data acquisition module 103, and a conductivity sensor module 104 to achieve a rapid and low-cost solution to the oil conductivity measurement problem, and overcomes many problems of inaccurate and unstable oil conductivity measurement.

Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (5)

1. An oil conductivity measuring instrument, characterized in that it includes a human-computer interaction module, a microcontroller module, a data acquisition module, a conductivity sensor module, a temperature and humidity module, and a power supply module; the microcontroller module is respectively connected to the human-computer interaction module, the data acquisition module, and the temperature and humidity module for mutual communication, the signal output end of the conductivity sensor module is connected to the signal input end of the data acquisition module, and the power supply module provides the required power supply voltage for each module of the oil conductivity measuring instrument; the data acquisition module includes a current-to-voltage circuit, a filter, and an ADC data collector, which are connected in sequence, the signal input end of the current-to-voltage circuit is connected to the signal output end of the conductivity sensor module, the signal output end of the ADC data collector is connected to the microcontroller module, and a shielding body is installed on the data acquisition module. 2. An oil conductivity measuring instrument according to claim 1, characterized in that: the microcontroller module adopts any one of a single-chip microcomputer and a FPGA. 3. An oil conductivity measuring instrument according to claim 1, characterized in that: the human-computer interaction module adopts any one of a touch screen and an LCD display screen with buttons. 4. The oil conductivity measuring instrument according to claim 1, characterized in that: the power supply module adopts any one of a voltage stabilizing chip and a DC-DC power supply chip. 5. The oil conductivity measuring instrument according to claim 1, characterized in that the temperature and humidity module adopts any one of a humidity acquisition chip and a temperature and humidity sensor.