CN215339379U

CN215339379U - Novel gas density measuring instrument

Info

Publication number: CN215339379U
Application number: CN202121286586.4U
Authority: CN
Inventors: 赵洋洋; 郭晓春
Original assignee: China Criminal Police University
Current assignee: China Criminal Police University
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-12-28
Anticipated expiration: 2031-06-09

Abstract

The utility model discloses a novel gas density measuring instrument which comprises a temperature and pressure acquisition module, an analog-to-digital conversion module, a voltage-stabilized power supply module and a display reminding module, wherein the temperature and pressure acquisition module is connected with the analog-to-digital conversion module; the temperature and pressure acquisition module consists of a gas bottle, a gas pressure sensor, a thermal resistance temperature sensor, a power interface, an output interface and a divider resistor; the analog-to-digital conversion module is a development board Arduino Uno module and consists of an ADC conversion part and a related port of a main control chip ATmega328 PU; the voltage-stabilized power supply module comprises a lithium battery; the display reminding module consists of a display screen and an Arduino passive buzzer; the analog-to-digital conversion module converts electric signals input by the air pressure sensor and the thermal resistance temperature sensor into pressure and temperature signals, the pressure and temperature signals are displayed on the color Liquid Crystal Display (LCD) screen in a visual mode, and the buzzer plays a role in prompting. The utility model has the beneficial effects that: the utility model has simple operation, and the gas density can be directly obtained by processing the electric signal through a computer; the thermal resistance temperature sensor and the pressure sensor have high precision and small error.

Description

Novel gas density measuring instrument

Technical Field

The utility model relates to the technical field of air density measurement, in particular to a novel gas density measuring instrument.

Background

The gas density is one of the important properties of the gas, and the gas species can be determined by measuring the gas density to obtain related information. Measurement of gas measurement has been a difficult problem, and conventional measurement methods include vacuum density bottle measurement and isovolumetric conversion.

The measurement results of the vacuum density bottle measurement method are relatively accurate but have the following defects: (1) the process is complex and the operation is complicated; (2) the glass density bottle is required to be filled with water for measuring the volume, but the density bottle is difficult to dry after water is poured, so that the experimental accuracy is influenced; (3) the experiment is carried out by using an even vacuum gauge and an electronic analytical balance, and the requirement on the sealing property of each interface is too strict; (4) a dense bottle of glass material is fragile and unsafe and the vacuum pump evacuates too quickly.

The isometric measurement method also has some disadvantages: (1) the air quality is small, and the relative measurement error of the quality is large; (2) a portion of the water remains in the container, affecting the measurement of the air volume; (3) the density of water is not completely accurate from a review of the data.

The experimental design abandons the traditional air density measurement method and avoids the measurement of air quality and volume. Based on an ideal gas equation and a Dalton partial pressure law, the measurement of the gas density is realized by measuring the gas pressure and temperature.

SUMMERY OF THE UTILITY MODEL

In order to solve the existing problems, the utility model provides a novel gas density measuring instrument. The utility model is realized by the following technical scheme.

A novel gas density measuring instrument comprises a temperature and pressure acquisition module, an analog-to-digital conversion module, a voltage-stabilized power supply module and a display reminding module;

the temperature and pressure acquisition module consists of a gas bottle, a TML-801 pressure sensor, a PT100 thermal resistance temperature sensor, a power supply interface, an output interface and a divider resistor;

the analog-to-digital conversion module is a development board Arduino Uno module and consists of an ADC conversion part of a main control chip ATmega328PU and related ports;

the voltage-stabilized power supply module comprises a YSN-1202000 lithium battery to provide stable 12V voltage direct current;

the display reminding module consists of a color Liquid Crystal Display (LCD) screen and an Arduino passive buzzer;

the analog-to-digital conversion module converts the electric signals input by the TML-801 air pressure sensor and the PT100 thermal resistance temperature sensor into pressure intensity and temperature signals, and the pressure intensity and the temperature signals are visually displayed on the color Liquid Crystal Display (LCD) screen, and after a button is pressed, when a data processing result is displayed, the Arduino passive buzzer sounds for prompting.

Preferably, the gas bottle is made of an acrylic material, and the rubber ring is sealed and stored; the measuring range of the TML-801 air pressure sensor is 200KPa, the precision is 0.2 percent, and the absolute air pressure is measured; the range of the PT100 thermal resistance temperature sensor is-30 ℃ to 150 ℃, the precision is 0.01 ℃, and the acquisition rate is 5 times/second.

Preferably, the size of the color liquid crystal LCD display screen is 74 × 49mm, and the resolution is 240 × 320.

The utility model has the beneficial effects that: the utility model abandons the traditional air density measurement method, avoids the measurement of the air quality and volume, and realizes the measurement of the air density by measuring the air pressure and the temperature based on an ideal gas equation and a Dalton partial pressure law. The advantages of this method over conventional gas density measurements are as follows: the operation is simple and convenient, and the gas density can be directly obtained by processing the electric signal through a computer; the PT100 thermal resistance temperature sensor and the pressure sensor have high precision and small error.

Drawings

Fig. 1 is a schematic structural diagram of a novel gas density measuring instrument according to the present invention.

Detailed Description

The technical scheme of the utility model is more fully explained in detail by combining the attached drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In specific embodiment 1, a novel gas density measuring instrument includes a temperature and pressure acquisition module, an analog-to-digital conversion module, a voltage-stabilized power supply module, and a display reminding module;

the temperature and pressure acquisition module consists of a gas bottle, a TML-801 pressure sensor, a PT100 thermal resistance temperature sensor, a power supply interface, an output interface and a divider resistor, wherein the gas bottle is made of an acrylic material, and a rubber ring is sealed and stored, so that the gas tightness is good, and the experimental requirements are met; the measuring range of the TML-801 air pressure sensor is 200KPa, the precision is 0.2 percent, and the absolute air pressure is measured; the measuring range of the PT100 thermal resistance temperature sensor is-30-150 ℃, the precision is 0.01 ℃, and the acquisition rate is 5 times/second;

the analog-to-digital conversion module is a development board Arduino Uno module, consists of an ADC conversion part and a related port of a main control chip ATmega328PU, converts electric signals input by a TML-801 air pressure sensor and a PT100 thermal resistance temperature sensor into binary data through links such as quantization, acquisition, comparison and the like in the ADC, converts the binary data into pressure and temperature signals through processing of a corresponding computer program, and displays the pressure and temperature signals on a color liquid crystal LCD display screen in a visual mode;

the display reminding module consists of a color Liquid Crystal Display (LCD) screen and an Arduino passive buzzer; the size of the color liquid crystal LCD screen is 74 × 49mm, the resolution is 240 × 320, so that the feedback of electric signals is realized, and the data measured by the TML-801 air pressure sensor and the PT100 thermal resistance temperature sensor are displayed on the color liquid crystal LCD screen; the Arduino passive buzzer plays a role in prompting, and after the button is pressed down, when a data processing result is displayed, the buzzer sounds for prompting.

The experimental method comprises the following steps:

(1) and opening a switch of the constant-temperature water bath kettle, and adjusting the preset water temperature to 30 ℃. Placing the gas bottle into a constant-temperature water bath kettle, observing temperature and pressure changes and observing whether bubbles emerge from the periphery of the gas bottle, and verifying the gas tightness of the device;

(2) when the temperature reading on the color liquid crystal LCD display screen is basically stable, pressing a touch button, and recording the temperature and air pressure reading when a buzzer sounds for prompting;

(3) the touch button is pressed again and the device resumes the high frequency reading state. Setting the preset temperature of the constant-temperature water bath kettle to 35 ℃, and repeating the operation;

(4) and measuring multiple groups of data and recording the result.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a novel gas density measuring apparatu, includes temperature pressure acquisition module, analog-to-digital conversion module, constant voltage power supply module, shows and reminds the module, its characterized in that:

2. The novel gas density measuring instrument according to claim 1, wherein: the gas bottle is made of an acrylic material, and the rubber ring is sealed and stored; the measuring range of the TML-801 air pressure sensor is 200KPa, the precision is 0.2 percent, and the absolute air pressure is measured; the range of the PT100 thermal resistance temperature sensor is-30 ℃ to 150 ℃, the precision is 0.01 ℃, and the acquisition rate is 5 times/second.

3. The novel gas density measuring instrument according to claim 1, wherein: the size of the color liquid crystal LCD screen is 74 × 49mm, and the resolution is 240 × 320.