A differential pressure densimeter

Abstract

The present application relates to a kind of differential pressure densimeter, including probe tube, two clamp connectors are provided on the probe tube, the clamp connector is communicated with probe tube, the end of the clamp connector away from probe tube is provided with PC112K core, the PC112K core blocks the opening of clamp connector, the bottom end of the probe tube is welded with blocking piece, the diameter of the blocking piece is equal to the diameter of probe tube, the side of gauge head body is threadedly connected with gauge head connector, the gauge head connector is threadedly connected with adapter, the bottom of the adapter is threadedly connected with probe tube. Different height pressure is measured by double pressure core, density information of liquid can be quickly obtained by calculation formula, users do not need complex training to easily operate, greatly simplify the measurement process, improve work efficiency.

Description

Technical Field

[0001] This invention belongs to the field of densitometers, specifically a differential pressure densitometer. Background Technology

[0002] In the current field of liquid density measurement, traditional density measurement equipment has many limitations. For example, commonly used laboratory density measuring instruments, such as the specific gravity bottle method, are cumbersome to operate, require precise measurement of liquid volume and mass, demand high operator skills, and are time-consuming, failing to meet the needs of rapid on-site testing. Some online density measuring instruments, while capable of real-time monitoring of liquid density in pipelines, are bulky, expensive, and complex to install and maintain, making them unsuitable for small businesses or work scenarios requiring frequent relocation of measurement locations. Furthermore, existing portable density measuring tools have limited accuracy, are inconvenient to use, cumbersome to operate, and are easily affected by environmental factors, leading to inaccurate measurement results. Therefore, a differential pressure density meter is proposed. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0004] Given the following technical problems in the existing technology: some existing portable density measuring tools have limited measurement accuracy, are inconvenient to use and cumbersome to operate, resulting in inaccurate measurement results.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a differential pressure density meter, including a probe tube, two clamp connectors are provided on the probe tube, the clamp connectors are connected to the probe tube, a PC112K core is provided at the end of the clamp connector away from the probe tube, the PC112K core blocks the opening of the clamp connector, a sealing block is welded to the bottom end of the probe tube, the diameter of the sealing block is equal to the diameter of the probe tube, a meter head connector is threadedly connected to one side of the meter head body, the meter head connector is threadedly connected to an adapter, and the bottom of the adapter is threadedly connected to the probe tube.

[0006] As a preferred technical solution for a differential pressure density meter, a receiving cavity is recessed on the inner side of the meter head body, and a circuit board is fixedly connected to the inner side of the receiving cavity. The circuit board is connected to two connecting wires, the bottom ends of which correspond one-to-one with the clamp connectors. The connecting wires are electrically connected to the corresponding PC112K cores to realize on-site information processing.

[0007] As a preferred technical solution for a differential pressure density meter, the circuit board is equipped with a display screen.

[0008] As a preferred technical solution for a differential pressure density meter, the flat plate on top of the meter head body is made of glass, which facilitates visual observation of the internal conditions of the meter head body, including reading information from the display screen.

[0009] The advantages of the differential pressure density meter of the present invention are as follows: by measuring the pressure at different heights through dual pressure cores, the density information of the liquid can be quickly obtained through calculation formula. Users can easily start operating it without complicated training, which greatly simplifies the measurement process and improves work efficiency.

[0010] With a built-in Bluetooth module, it facilitates data transmission, data processing and analysis, and provides strong data support for production process monitoring and quality control. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 This is a cross-sectional structural diagram of the meter body of the present invention.

[0014] Reference numerals in the attached diagram: 1. Meter head body; 2. Meter head connector; 3. Adapter; 4. Probe; 5. Clamp connector; 6. PC112K core; 7. Sealing block; 8. Circuit board; 9. Connecting wire. Detailed Implementation

[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0017] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0018] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0019] like Figures 1 to 2 As shown, this invention proposes a differential pressure density meter, including a probe tube 4. Two clamp connectors 5 are provided on the probe tube 4, and the clamp connectors 5 are connected to the probe tube 4. A PC112K core 6 is provided at the end of the clamp connector 5 away from the probe tube 4. The PC112K core 6 blocks the opening of the clamp connector 5. A sealing block 7 is welded to the bottom end of the probe tube 4. The diameter of the sealing block 7 is equal to the diameter of the probe tube 4. A meter head connector 2 is threadedly connected to one side of the meter head body 1. The meter head connector 2 is threadedly connected to an adapter 3. The bottom of the adapter 3 is threadedly connected to the probe tube 4.

[0020] The inner side of the meter body 1 is recessed with a receiving cavity, and a circuit board 8 is fixedly connected to the inner side of the receiving cavity. The circuit board 8 is connected to two connecting wires 9. The bottom end of the connecting wires 9 corresponds to the clamp connector 5 one by one. The connecting wires 9 are electrically connected to the corresponding PC112K core 6 to realize on-site information processing.

[0021] The circuit board 8 is equipped with a display screen.

[0022] The top plate of the meter body 1 is made of glass, which facilitates visual observation of the internal situation of the meter body 1, including reading the information on the display screen.

[0023] A Bluetooth module is installed on circuit board 8. The Bluetooth module can be of model HC-05 or HC-06.

[0024] The specific implementation method is as follows: using a dual pressure core (e.g., two PC112K) to measure the pressure of liquid at different heights, the liquid level can be calculated by differential pressure method;

[0025] The principle is as follows:

[0026] Placement method: One sensor is placed at the bottom of the liquid (to measure total pressure, including hydrostatic pressure and atmospheric pressure), and the other sensor remains at the top of the liquid surface (to measure atmospheric pressure);

[0027] Differential pressure calculation: The liquid height h can be calculated using the differential pressure formula:

[0028]

[0029] in:

[0030] Δp: The pressure difference measured by the two sensors (bottom pressure - top pressure);

[0031] ρ: Liquid density (must be known or measured by an additional sensor);

[0032] g: acceleration due to gravity (approximately 9.81 m / s²) 2 );

[0033] Output signal: The PC112K chip outputs an analog voltage signal (mV level), which is proportional to the pressure; it needs to be amplified, converted from analog to digital and processed by a circuit board.

[0034] Δp can be obtained through measurement and calculation. The distance between the two PC112K cores when placed vertically is h. Given g = 9.81 m / s². 2 Substituting this into the formula, we can calculate the value of ρ.

[0035] Circuit board design and signal processing:

[0036] In order to receive and process the signals of the PC112K chip and to achieve data output, the circuit board (8) needs to include the following modules:

[0037] 1) Signal conditioning module:

[0038] Amplification circuit: The output signal of PC112K is relatively weak (usually in the mV range), and a high-precision instrumentation amplifier (such as AD623, INA125 or PGA900) is required to amplify the signal in order to improve the signal-to-noise ratio;

[0039] Wheatstone bridge: The PC112K typically uses a Wheatstone bridge structure to output differential signals; the circuit board needs to provide a stable drive voltage (usually 3.3V or 5V) and read the differential output;

[0040] Filtering circuit: Add a low-pass filter (such as an RC filter or an active filter) to remove high-frequency noise and ensure signal stability;

[0041] 2) Analog-to-Digital Conversion (ADC) Module:

[0042] ADC chips: High-resolution ADCs (such as 16-bit or 24-bit ADS1115 and ADS1256) are used to convert analog signals into digital signals for microcontroller processing.

[0043] Sampling rate: Select an appropriate sampling rate according to the application requirements. Usually, tens to hundreds of Hz are sufficient to meet the real-time requirements of liquid level measurement.

[0044] 3) Temperature compensation module:

[0045] The output of the PC112K is significantly affected by temperature, and a temperature compensation algorithm is needed to improve measurement accuracy.

[0046] Temperature sensor: A high-precision temperature sensor (such as DS18B20, PT100 or NTC thermistor) is integrated on the circuit board to measure the ambient temperature. The temperature compensation algorithm is existing technology.

[0047] Compensation algorithm:

[0048] Hardware compensation: Preliminary temperature compensation is performed on the circuit board using laser resistance correction technology or a dedicated compensation chip (such as PGA900);

[0049] Software compensation: Implementing temperature compensation algorithms in a microcontroller, for example:

[0050] Least squares method: Parameter compensation based on temperature-pressure characteristic curve fitting;

[0051] Lagrange interpolation: nonlinear compensation for temperature drift;

[0052] Multinomial regression: Build a mathematical model based on temperature and pressure data and correct the output values;

[0053] For example, the reference describes a temperature compensation system for a silicon sapphire pressure sensor that combines the least squares method and the Lagrange interpolation algorithm to reduce the nonlinear error to 0.028%.

[0054] 4) Microcontroller (MCU) module

[0055] MCU selection: Use a high-performance microcontroller (such as STM32, ESP32, Arduino or Raspberry Pi) for data processing and algorithm implementation;

[0056] Function:

[0057] Read the digital signal after ADC conversion;

[0058] Calculate the differential pressure Δp and the liquid height h;

[0059] Execute the temperature compensation algorithm to correct the pressure value;

[0060] Through communication interfaces (such as I) 2 (C, SPI, or UART) sends the processed data to the display screen or other devices;

[0061] in:

[0062] Sensor: Two PC112K cores, placed at the bottom and top of the liquid respectively;

[0063] Signal conditioning: Instrumentation amplifier (e.g., INA125) + low-pass filter;

[0064] ADC: High-precision ADC (such as ADS1115);

[0065] Temperature sensor: DS18B20 or PT100, used for temperature compensation;

[0066] MCU: STM32 or Arduino, running differential pressure calculation and temperature compensation algorithms;

[0067] Display: LCD1602, OLED SSD1306, or Nextion HMI screen;

[0068] Power Management: Provides a stable 3.3V / 5V power supply to ensure the proper functioning of the sensor and circuit board.

[0069] The temperature compensation algorithm can be:

[0070] To eliminate the influence of temperature on the measurement results of PC112K, a precise temperature compensation algorithm can be used:

[0071] Data acquisition: Ambient temperature is collected in real time via a temperature sensor;

[0072] Calibration: The PC112K was calibrated at different temperatures, and the relationship between pressure output and temperature was recorded to generate a calibration curve;

[0073] Algorithm implementation:

[0074] Linear compensation: Assuming that pressure changes linearly with temperature, the formula P is used. corrected =P raw +k*(T-T0), where k is the temperature coefficient and T0 is the reference temperature;

[0075] Nonlinear compensation: Nonlinear drift is compensated using polynomial regression or lookup tables (LUTs). For example:

[0076] P corrected =P raw +a*T+b*T 2 +c;

[0077] Where a, b, and c are the fitting coefficients;

[0078] Advanced Algorithm: Combining least squares and Lagrange interpolation, the output value is dynamically adjusted based on the sensor characteristic curve.

[0079] Implementation: Implement the above algorithm in the MCU using C / C++ or Python to ensure real-time performance and accuracy.

[0080] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A differential pressure density meter, characterized in that: The device includes a probe (4), on which two clamp connectors (5) are provided. The clamp connectors (5) are connected to the probe (4). A PC112K core (6) is provided at the end of the clamp connector (5) away from the probe (4). The PC112K core (6) blocks the opening of the clamp connector (5). A sealing block (7) is welded to the bottom end of the probe (4). The diameter of the sealing block (7) is equal to the diameter of the probe (4). A meter connector (2) is threadedly connected to one side of the meter body (1). The meter connector (2) is threadedly connected to the adapter (3). The bottom of the adapter (3) is threadedly connected to the probe (4).

2. The differential pressure density meter according to claim 1, characterized in that: The inner side of the meter body (1) is recessed with a receiving cavity, and a circuit board (8) is fixedly connected to the inner side of the receiving cavity. The circuit board (8) is connected to two connecting wires (9). The bottom end of the connecting wire (9) corresponds to the clamp connector (5) one by one, and the connecting wire (9) is electrically connected to the corresponding PC112K core (6).

3. A differential pressure density meter according to claim 2, characterized in that: The circuit board (8) is equipped with a display screen.

4. A differential pressure density meter according to claim 2, characterized in that: The flat plate on top of the meter body (1) is made of glass.

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