Venturi tube pressure detection device

Abstract

The utility model relates to a Venturi tube pressure detection device which comprises a connecting pipeline, a stop valve, an msp20 pressure detection module, a 51 single chip microcomputer and a display screen. The connecting pipeline is connected with the throat pipe section of the Venturi pipe and the msp20 pressure detection module, the stop valve is arranged on the connecting pipeline to control the connecting pipeline to be communicated and closed, and the 51 single chip microcomputer is electrically connected with the msp20 pressure detection module and the display screen. According to the utility model, the single-chip microcomputer, the msp20 pressure detection module and the display screen are introduced to realize more visual and accurate data acquisition of the pressure of the throat pipe section, and more reliable and efficient technical support is provided for subsequent experimental research and industrial production.

Description

Technical Field

[0001] The utility model relates to the technical field of venturi tube pressure detection, in particular to a venturi tube pressure detection device. Background Art

[0002] The venturi tube is a pipe that contracts first and then gradually expands. Its structure includes an inlet section, a contraction section, a throat section and a diffusion section. Pressure detection of the throat section is the basis for realizing its flow measurement function. For example, the pressure change of the throat section of a venturi bubble generator is an important physical quantity, which reflects the fluid dynamics state inside the bubble generator. Most of the pressure measurement methods for the throat section of a venturi bubble generator use a gas flow meter to measure. The main problems of this method are: 1. The feedback of the pressure change is not intuitive and needs to be obtained through conversion; 2. The accuracy of the gas flow meter is insufficient and is greatly affected by the environment. In view of the problem that the pressure change feedback of the throat section of the venturi tube is not obvious, the utility model proposes a venturi tube pressure detection device, which introduces a single-chip microcomputer and additional components to achieve more intuitive and accurate data acquisition, so as to more accurately understand the pressure changes and provide more reliable and efficient technical support for subsequent experimental research and industrial production. Utility Model Content

[0003] The purpose of the utility model is to provide a Venturi tube pressure detection device, which introduces a single-chip microcomputer and additional components to achieve more intuitive and accurate data acquisition of throat section pressure, and provide more reliable and efficient technical support for subsequent experimental research and industrial production.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is: a venturi tube pressure detection device, including a connecting pipe, a stop valve, an msp20 pressure detection module, a 51 single-chip microcomputer and a display screen; the connecting pipe connects the throat section of the venturi tube and the msp20 pressure detection module, the stop valve is arranged on the connecting pipe to control the connectivity and closure of the connecting pipe, and the 51 single-chip microcomputer is electrically connected to the msp20 pressure detection module and the display screen respectively.

[0005] Furthermore, the connecting pipeline includes a first pipeline and a second pipeline, the first pipeline is respectively sealed and connected to the throat section of the venturi tube and one end of the stop valve, the second pipeline is respectively sealed and connected to the other end of the stop valve and the msp20 pressure detection module, and the stop valve is used to control the connection and closing between the first pipeline and the second pipeline.

[0006] Furthermore, the throat section of the venturi tube extends outwardly and is provided with a pressure measuring opening; the first pipe and the second pipe are both hoses, the first pipe is sealingly sleeved on the outer wall of the pressure measuring opening at the throat section of the venturi tube and is connected to the inside of the throat section, and the second pipe is sealingly sleeved on the pressure measuring interface of the msp20 pressure detection module.

[0007] Furthermore, the display screen model is LCD1602.

[0008] Furthermore, the connection between the msp20 pressure detection module and the single-chip microcomputer is specifically as follows: the power pin, ground pin and data transmission pin AO of the msp20 pressure detection module are respectively connected to the power pin, ground pin and analog signal input pin P0 of the single-chip microcomputer through DuPont wires.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] The utility model provides a stop valve, which is closed when the venturi tube starts to pass fluid, thereby solving the problem that the fluid may flow out before the throat section forms a stable negative pressure, and opens the stop valve after the throat section forms a stable negative pressure, so as to ensure that subsequent detection equipment can receive the throat section pressure under the stable negative pressure state; this strategy not only improves the accuracy of detection, but also ensures the normal operation of subsequent detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the initial state of the Venturi tube of the utility model;

[0013] Figure 3 This is the circuit schematic diagram of the msp20 pressure detection module of the utility model;

[0014] Figure 4 This is the circuit schematic diagram of the utility model single chip microcomputer;

[0015] Figure 5 The utility model is a circuit schematic diagram of a display screen. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings.

[0017] The utility model proposes a Venturi tube pressure detection device, as shown in the attached Figure 1-2As shown, it includes a connecting pipe, a stop valve 6, an msp20 pressure detection module 7, a 51 single-chip computer 8 and a display screen; the connecting pipe connects the throat section 3 of the venturi tube 1 and the msp20 pressure detection module 7, the stop valve 6 is arranged on the connecting pipe to control the connection and closure of the connecting pipe, and the 51 single-chip computer 8 is electrically connected to the msp20 pressure detection module 7 and the display screen respectively.

[0018] The connecting pipeline includes a first pipeline 4 and a second pipeline 5, the first pipeline 4 is respectively sealed and connected to the throat section 3 of the venturi tube 1 and one end of the stop valve 6, the second pipeline 5 is respectively sealed and connected to the other end of the stop valve 6 and the msp20 pressure detection module 7, and the stop valve 6 is used to control the connection and closing between the first pipeline 4 and the second pipeline 5.

[0019] The throat section 3 of the venturi tube 1 extends outward and is provided with a pressure measuring opening 2; the first pipe 4 and the second pipe 5 are both hoses, the first pipe 4 is sealingly sleeved on the outer wall of the pressure measuring opening 2 at the throat section of the venturi tube and is connected to the inside of the throat section 3, and the second pipe 5 is sealingly sleeved on the pressure measuring interface of the msp20 pressure detection module 7.

[0020] The display screen model is LCD1602.

[0021] The connection between the msp20 pressure detection module and the single-chip microcomputer is specifically as follows: the power pin, ground pin and data transmission pin AO of the msp20 pressure detection module are respectively connected to the power pin, ground pin and analog signal input pin P0 of the single-chip microcomputer through DuPont wires.

[0022] The following is a specific embodiment of the present invention:

[0023] The pressure change in the throat section of the Venturi bubble generator is an important physical quantity, which reflects the fluid dynamics state inside the bubble generator. In order to accurately detect this pressure change, a Venturi tube pressure detection device is proposed:

[0024] The core part of the device is the msp20 pressure monitoring module, which contains a bridge circuit inside. The resistance value of the circuit will change accordingly according to the received pressure signal. When the pressure of the venturi throat is transmitted to the msp20 module through the rubber hose, this pressure change will act on the sensitive elements in the bridge circuit, causing the resistance value to change. When the msp20 module is powered on, the resistance change in the bridge circuit will cause the voltage distribution in the circuit to change. This voltage change is manifested as an analog signal output on the AO port of the msp20 module. This analog signal is then transmitted to the signal input pin P0 of the microcontroller through the DuPont line.

[0025] After receiving this analog signal, the microcontroller will process it internally. It will first convert the analog signal into a digital signal for subsequent calculation and display. This conversion process is completed by the analog-to-digital converter (ADC) inside the microcontroller. After the conversion is completed, the microcontroller sends the processed digital quantity to the LCD1602 display. The display will update the display content in real time according to the received data, thereby showing the detected pressure value.

[0026] Through this basic principle, we can achieve real-time monitoring and precise measurement of the pressure changes at the gas inlet section of the Venturi bubble generator. This device not only improves the accuracy and reliability of the experiment, but also provides strong support for subsequent data analysis and device optimization.

[0027] An opening for pressure measurement is provided at the throat of the venturi bubble generator, and a rubber hose with a diameter corresponding to the opening is selected and put on the opening to ensure air tightness; the other end of the rubber hose is connected to a stop valve, and the other end of the stop valve is connected to the pressure measuring module of the msp20 pressure detection device through the rubber hose.

[0028] When the fluid starts to flow through the venturi tube, it usually faces a problem: before the throat section forms a stable negative pressure, the internal fluid tends to flow out along the opening on the side of the throat, which may interfere with subsequent detection equipment or cause unnecessary losses. The installed stop valve can completely close the small pipe opening when necessary to prevent the fluid from flowing out. At the same time, we chose a stop valve that is easy to operate and durable to ensure its long-term stable operation. The stop valve only needs to work properly, and no specific model is required.

[0029] When we start to introduce liquid, we first close the stop valve to ensure that the fluid does not flow out of the small pipe. This step is crucial because it avoids the potential interference of the fluid with the subsequent testing equipment before the venturi tube throat section forms a stable negative pressure. Then, we will wait for some time and open the valve after the venturi tube runs stably and the throat section forms a stable negative pressure, ensuring that the subsequent testing equipment can receive the fluid that meets the requirements after being processed by the venturi tube.

[0030] By installing a stop valve and closing it when the liquid is first introduced, we successfully solved the problem of the fluid possibly flowing out before a stable negative pressure is formed in the throat section. This strategy not only improves the accuracy of the test, but also ensures the normal operation of the subsequent test equipment.

[0031] In order to ensure the air tightness of the connection, we use rubber hose for connection. The rubber hose has good flexibility and sealing, which can effectively prevent gas leakage and ensure the stability of negative pressure and the accuracy of measurement.

[0032] During the operation of the venturi tube, the pressure changes will be transmitted to the pressure measuring part of the msp20 by squeezing the air inside the hose, thereby realizing real-time monitoring and measurement of negative pressure. When the venturi tube is running stably, it is considered that the negative pressure of the throat section is equal to the pressure of the hose section, and no more air is sucked. There will be no obvious pressure changes in the throat section to cause the rubber hose to deform. Therefore, the problem of inaccurate pressure measurement due to deformation of the rubber hose is not considered.

[0033] The msp20 pressure detection module has high-precision pressure sensing capabilities and can capture subtle changes in pressure in real time. The three pins on the module - AO (analog signal output), GND (ground) and VCC (positive power supply) - are connected to the corresponding pins of the microcontroller through DuPont wires. Among them, the AO pin is connected to the signal port P0 of the microcontroller for transmitting air pressure data; the GND pin is connected to the ground wire of the microcontroller to ensure the stability of the circuit; the VCC pin is connected to the 5V power supply of the microcontroller to provide working voltage for the pressure detection module.

[0034] As the core control unit of the whole system, the microcontroller is responsible for receiving and processing data from the msp20 pressure detection module. In order to facilitate observation and recording of data, the microcontroller is also connected to an lcd1602 display, which usually includes connecting the power pin, ground pin, data pin and control pin of the LCD1602 to the corresponding I / O port of the microcontroller. When the microcontroller is powered on, it will read the pressure data of the msp20 module in real time and display it on the display. In this way, we can intuitively understand the pressure changes in the intake section of the venturi tube.

[0035] The above are preferred embodiments of the present invention. Any changes made according to the technical solution of the present invention, as long as the resulting functions do not exceed the scope of the technical solution of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A Venturi tube pressure detection device, characterized in that: The invention comprises a connecting pipe, a stop valve (6), an msp20 pressure detection module (7), a 51 single chip microcomputer (8) and a display screen; the connecting pipe connects the throat section (3) of the venturi tube (1) and the msp20 pressure detection module (7); the stop valve (6) is arranged on the connecting pipe to control the connection and closing of the connecting pipe; and the 51 single chip microcomputer (8) is electrically connected to the msp20 pressure detection module (7) and the display screen respectively.

2. A Venturi tube pressure detection device according to claim 1, characterized in that: The connecting pipeline comprises a first pipeline (4) and a second pipeline (5), wherein the first pipeline (4) is respectively sealedly connected to the throat section (3) of the venturi tube (1) and one end of the stop valve (6), and the second pipeline (5) is respectively sealedly connected to the other end of the stop valve (6) and the msp20 pressure detection module (7), and the stop valve (6) is used to control the connection and sealing between the first pipeline (4) and the second pipeline (5).

3. A Venturi tube pressure detection device according to claim 2, characterized in that: The throat section (3) of the venturi tube (1) extends outward and is provided with a pressure measuring opening (2); the first pipe (4) and the second pipe (5) are both hoses, the first pipe (4) is sealingly sleeved on the outer wall of the pressure measuring opening (2) at the throat section of the venturi tube and is connected to the inside of the throat section (3), and the second pipe (5) is sealingly sleeved on the pressure measuring interface of the msp20 pressure detection module (7).

4. A Venturi tube pressure detection device according to claim 1, characterized in that: The display screen model is LCD1602.

5. A Venturi tube pressure detection device according to claim 1, characterized in that: The connection between the msp20 pressure detection module and the single-chip microcomputer is specifically as follows: the power pin, ground pin and data transmission pin AO of the msp20 pressure detection module are respectively connected to the power pin, ground pin and analog signal input pin P0 of the single-chip microcomputer through DuPont wires.

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