CN204514835U - Water boiling point and pressure relation measuring device - Google Patents

Abstract

The utility model discloses a device for measuring the relationship between the boiling point of water and the pressure. Including: iron stand (1), pressure sensor (2), fixed pulley (3), weight (4), pressure limiting weight (5), thermocouple (6), pressure cooker (7), electric furnace (8), Single-chip microcomputer (9), 12864 liquid crystal display (10). During use, one-third of the water is filled in the pressure cooker (7), and the pressure and temperature of the water are recorded by the pressure sensor (2) and the thermocouple (6) for every weight reduction of 20g, and the boiling point is displayed by the 12864 liquid crystal display (10) Pressure graph.

Description

Measuring device for relationship between boiling point of water and pressure

technical field

The utility model belongs to the field of physical measurement and relates to a device for measuring the relationship between the boiling point of water and pressure.

Background technique

A pressure sensor is a sensor that senses pressure and converts it into a usable output signal. Pressure sensors are the most commonly used sensors in industrial practice. Generally, the output of ordinary pressure sensors is an analog signal, and an analog signal refers to a signal in which information parameters appear as continuous signals within a given range. Or within a continuous time interval, the characteristic quantity representing information can appear as a signal of any value at any instant.

There are many types of pressure sensors, mainly piezoresistive pressure sensors, inductive pressure sensors, capacitive pressure sensors, resonant pressure sensors and capacitive acceleration sensors. But the most widely used is the piezoresistive pressure sensor, which has extremely low price, high precision and good linearity. The resistance strain gauge is a sensitive device that converts the strain change on the tested object into an electrical signal. It is one of the main components of piezoresistive strain sensors. The most widely used strain gauges are metal resistance strain gauges and semiconductor strain gauges. The resistance value change produced by the strain gauge when it is stressed is usually small. Generally, this strain gauge forms a strain bridge, which is amplified by a subsequent instrument amplifier and then transmitted to the processing circuit (usually A/D conversion and CPU) ) display or actuator.

Thermocouple is a commonly used temperature measuring element in temperature measuring instruments. It directly measures the temperature, and converts the temperature signal into a thermal electromotive force signal, and converts it into the temperature of the measured medium through an electrical instrument. The shapes of various thermocouples are often very different due to needs, but their basic structures are roughly the same, usually composed of main parts such as thermal electrodes, insulating sleeve protection tubes, and junction boxes, and are usually associated with display instruments, recording instruments, and electronic regulators. used together with the device.

Single-chip microcomputer, referred to as single-chip microcomputer, is a typical embedded microcontroller (Microcontroller Unit). The abbreviation MCU is often used to represent single-chip microcomputer. It was first used in the field of industrial control. At present, single-chip microcomputers have penetrated into various fields of our lives, and it is almost difficult to find any field without traces of single-chip microcomputers. The single-chip microcomputer is run by the program and can be modified. Different functions can be realized through different programs. Through the programs, the single-chip microcomputer can conveniently control the lighting speed of LED lamps and digital tubes and the speed of the motor, and can easily generate various random numbers and perform calculations. The high intelligence, high efficiency, and high reliability of the product can be realized through the program.

12864 liquid crystal display is the abbreviation of dot matrix number of 128*64 dot matrix liquid crystal module. The screen display cost of the dot matrix is relatively low, and it is suitable for various instruments and the display field of small equipment.

Contents of the invention

When studying the relationship between the boiling point of water and pressure, traditional experiments need to manually record the relationship between temperature and pressure. Now thermocouples and pressure sensors are introduced to measure the temperature and pressure, and a 12864 liquid crystal display is introduced to display the relationship between temperature and pressure. The purpose of this utility model is to design a simple structure, easy to use, reliable performance, low cost measuring device for the relationship between the boiling point of water and pressure, which can automatically display the relationship curve of temperature and pressure changes.

In order to achieve the above object, the utility model comprises: an iron stand (1), a pressure sensor (2), a fixed pulley (3), a weight (4), a pressure limiting weight (5), a thermocouple (6), a pressure cooker (7) ), electric heating furnace (8), single-chip microcomputer (9), 12864 liquid crystal display (10), it is characterized in that: iron stand platform (1) is made of base, vertical bar and cross bar, and iron stand platform (1) is a base below, base A vertical pole is fixed on the top, one end of the crossbar is horizontally fixed on the vertical pole, the other end of the crossbar is fixed with a fixed pulley (3), the electric furnace (8) is placed under the crossbar of the iron stand (1), and the pressure cooker (7) Place it on the electric furnace (8), place the pressure limiting weight (5) at the air outlet in the center of the upper cover of the pressure cooker (7), connect a thin wire to the end of the pressure limiting weight (5), and the thin wire goes around the fixed pulley (3) After connecting the weight (4), the temperature measuring part of the thermocouple (6) is embedded into the inside of the pressure cooker (7) from the upper cover of the pressure cooker (7), and the pressure sensor (2) is embedded from the inner surface of the upper cover of the pressure cooker (7) The cover is punched to lead out the output line, and the outputs of the pressure sensor (2) and the thermocouple (6) are sent to the single-chip microcomputer (9) respectively, and the single-chip microcomputer (9) sends the processing result to the 12864 liquid crystal display (10) for display.

Description of drawings

Fig. 1 schematic diagram of the structure of the measuring device for the relationship between the boiling point of water and the pressure;

Fig. 2 signal processing block diagram of measuring device for relationship between water boiling point and pressure;

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in detail.

Referring to Fig. 1 water boiling point and pressure relation measuring device structure schematic diagram, water boiling point and pressure relation measuring device is made of iron frame platform (1), pressure transducer (2), fixed pulley (3), weight (4), pressure limiting weight (5 ), thermocouple (6), pressure cooker (7), electric heating furnace (8), single-chip microcomputer (9), 12864 liquid crystal display (10), iron frame platform (1) is made of base, vertical rod and cross bar, iron frame platform ( 1) Below is a base on which a pole is fixed, one end of the cross bar is fixed horizontally on the pole, the other end of the cross bar is fixed to the fixed pulley (3), and the electric furnace (8) is placed on the iron stand (1). Below the cross bar, the pressure cooker (7) is placed on the electric heating furnace (8), and the pressure limiting weight (5) is placed at the air outlet in the center of the upper cover of the pressure cooker (7). The pressure limiting weight (5) is terminated with a thin wire. The wire goes around the fixed pulley (3) and connects to the weight (4). The temperature measuring part of the thermocouple (6) is inserted into the inside of the pressure cooker (7) from the upper cover of the pressure cooker (7). The inner surface of the cover is embedded and the output line is drawn out from the upper cover.

Referring to Fig. 2 water boiling point and pressure relation measuring device signal processing block diagram, the output of pressure transducer (2) and thermocouple (6) is sent into single-chip microcomputer (9) respectively, and single-chip microcomputer (9) sends processing result into 12864 liquid crystal display (10) show.

During use, one-third of the water is filled in the pressure cooker (7), and the pressure and temperature of the water are recorded by the pressure sensor (2) and the thermocouple (6) for every weight reduction of 20g, and the boiling point is displayed by the 12864 liquid crystal display (10) Pressure graph.

Claims (1)

1. A water boiling point and pressure relation measuring device is characterized in that: the water boiling point and pressure relation measuring device is made of iron stand (1), pressure sensor (2), fixed pulley (3), weight (4), pressure limiting Weight (5), thermocouple (6), pressure cooker (7), electric furnace (8), single-chip microcomputer (9), 12864 liquid crystal display (10), and iron frame platform (1) is made of base, upright bar and horizontal bar, Below the iron frame platform (1) is a base, a vertical pole is fixed on the base, one end of the cross bar is horizontally fixed on the vertical pole, the other end of the cross bar is fixed with a fixed pulley (3), and the electric furnace (8) is placed on the iron frame platform ( 1), the pressure cooker (7) is placed on the electric furnace (8), and the pressure limiting weight (5) is placed at the air outlet in the center of the upper cover of the pressure cooker (7). The thin wire bypasses the fixed pulley (3) and then connects the weight (4), the temperature measuring part of the thermocouple (6) is inserted into the inside of the pressure cooker (7) from the upper cover of the pressure cooker (7), and the pressure sensor (2) is connected from the pressure cooker ( 7) The inner surface of the upper cover is embedded and the output line is drawn out from the upper cover, the output of the pressure sensor (2) and the thermocouple (6) are respectively sent to the single-chip microcomputer (9), and the single-chip microcomputer (9) sends the processing results to the 12864 LCD Display (10) shows.