Pressure sensing system and pressure sensing device thereof

Abstract

The utility model relates to the technical field of sensor communication, in particular to a pressure sensing system and a pressure sensing device thereof, and solves the problem that when a pressure sensor is used for pressure monitoring in the prior art, signal damage and loss occur in the signal transmission process due to interference of an external specific environment. Comprising a display control circuit, a nixie tube and a square frame display strip, and the nixie tube is used for displaying character information of pressure sensing; and the calibration calculation module comprises a main control chip, a voltage reducing and stabilizing circuit, an A / D conversion circuit, an electrostatic suppression circuit, an RS-485 communication circuit and a key control circuit. The pressure monitoring and signal transmission process is protected and calibrated, so that the damage and loss of signals can be effectively avoided, and the pressure in different directions can be measured.

Description

Technical Field

[0001] This invention relates to the field of sensor communication technology, specifically to a pressure sensing system and its pressure sensing device. Background Technology

[0002] When pressure sensors are used in fields such as testing and measurement, mechanical experiments, automation, and robotics, there are certain requirements for experimental equipment and measurement environment. At the same time, the sensors are required to be as accurate as possible. A pressure sensor is a device used to measure the pressure of gas or liquid. With the continuous advancement of technology, pressure sensors are developing towards higher accuracy, wider range, and greater stability and reliability. The logic calculation program built into the pressure sensor can solve the calibration problem of the sensor and improve the accuracy of the sensor.

[0003] Existing pressure sensors used for pressure monitoring are susceptible to interference from specific external environments, resulting in signal damage and loss during transmission; therefore, they do not meet current requirements. To address this, we propose a pressure sensing system and its pressure sensing device. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure sensing system and its pressure sensing device to solve the problem mentioned in the background art that existing pressure sensors used for pressure monitoring are subject to interference from specific external environments, resulting in signal damage and loss during signal transmission.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure sensing system, comprising:

[0006] Keypad display: Used to receive data and address commands and convert them into corresponding instructions, and to display the pressure sensor data, including display control circuit, digital tube, and square display bar. The digital tube is used to display the character information of the pressure sensor.

[0007] Calibration Calculation Module: Used to measure, calculate, and output pressure values, this module can independently and continuously correct the zero point, linearity, and temperature drift data of the pressure sensor, ensuring the accuracy and reliability of the output signal. It includes a main control chip, a buck regulator circuit, an A / D conversion circuit, an electrostatic suppression circuit, an RS-485 communication circuit, and a key control circuit. The main control chip loads the logic program and sequentially initializes the key display, sets the step value, performs zero-point calibration, and full-scale calibration. The buck regulator circuit converts the input voltage into multiple output voltage values ​​and supplies power to the main control chip, A / D conversion circuit, electrostatic suppression circuit, RS-485 communication circuit, and key control circuit.

[0008] Pressure sensor body: used for pressure contact and generating pressure signals, and for converting and transmitting the pressure signals to the calibration calculation module.

[0009] Preferably, the display control circuit consists of an LED driver IC with a keyboard scanning interface and surrounding circuitry. The LED driver IC integrates an MCU digital interface, a data latch, an LED high-voltage driving circuit, and a keyboard scanning circuit. The LED driver IC receives data and address commands transmitted from the surrounding circuitry and illuminates the corresponding LEDs on the digital tube. Multiple LEDs are powered on and illuminated to form display characters.

[0010] Preferably, the A / D conversion circuit includes a power switch, an on-chip clock oscillator, and a single-ended input for battery voltage detection. The on-chip clock oscillator provides a clock reference for the A / D conversion circuit. The single-ended input for battery voltage detection is connected to a battery and reads the battery voltage value through the A / D conversion. The A / D conversion circuit is used to read the sensor main signal.

[0011] Preferably, the electrostatic discharge suppression circuit is used to respond to electrostatic surges and maintain leakage current protection of the circuit interface, and the RS-485 communication circuit supports the connection between the main control chip and the RS-485 communication circuit.

[0012] Preferably, the inner side of the button control circuit is provided with a tactile switch and a capacitor. The tactile switch and the capacitor are connected in parallel. The capacitor adjusts the voltage value across the tactile switch and filters out the button bounce range of the tactile switch.

[0013] A pressure sensing device for a pressure sensing system includes a sensor body. The sensor body includes a sealed chassis. A mounting shell is installed on the outer side of the upper end of the sealed chassis. A partition plate is fixedly installed on the inner side of the upper end of the sealed chassis. A circuit board is fixedly installed on the lower end face of the partition plate. A wire sealing sleeve is provided in the middle of the lower end face of the circuit board. An arc-shaped contact seat is installed on the inner side of the middle of the partition plate. A ball head transmission seat is installed above the arc-shaped contact seat. Multiple annular contact strips are provided between the arc-shaped contact seat and the ball head transmission seat.

[0014] Preferably, the sensor body further includes a limiting ring connected to the upper end of the mounting shell. Two pressure rings are installed on the inner side of the bottom end of the limiting ring, and an elastic ring is provided on the inner side of the two pressure rings. Multiple transmission feet are installed on the upper end face of the ball head transmission seat. A contact foot pressure plate is installed on the inner side of the upper end of the multiple transmission feet. A contact cover is installed on the upper end face of the contact foot pressure plate, and a positioning ring is installed on the outer side of the middle part of the contact cover.

[0015] Preferably, the bottom end of the mounting shell is connected to the sealing chassis by a thread, the upper end of the wire sealing sleeve passes through the middle of the sealing chassis and is bonded and fixed to the circuit board, and the bottom end of the arc-shaped contact seat passes through the middle of the partition plate and is in contact with the upper surface of the circuit board.

[0016] Preferably, the circuit board is electrically connected to both the arc-shaped contact seat and the ball-head transmission seat, and the arc-shaped contact seat is fixedly connected to multiple annular contact strips, with the multiple annular contact strips arranged circumferentially relative to the axis of the arc-shaped contact seat.

[0017] Preferably, the upper end of the mounting shell is fixedly connected to the positioning ring by a limiting ring, the limiting ring is threaded to both pressure rings, the upper end of the ball head transmission seat is connected to both pressure rings by an elastic ring, the middle part of the contact cover is fixedly connected to multiple transmission feet by contact foot pressure plates, and both the contact cover and the ball head transmission seat reciprocate relative to the axis of the arc-shaped contact seat.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention protects and calibrates the pressure monitoring and signal transmission process, effectively preventing signal damage and loss. It can also convert and display received data, making reading convenient. The sensor calibration logic is simple, reliable, and fast, and the cost is low.

[0020] 2. In this invention, the contact cover is driven by the contact foot pressing plate to simultaneously drive multiple circumferentially arranged transmission contacts to swing. While the multiple transmission contacts are swinging, the ball head transmission seat can be eccentrically pressed down and offset relative to the axis of the arc-shaped contact seat. When the bottom end of the ball head transmission seat is offset, it can contact the corresponding annular contact strip. When the ball head transmission seat and the arc-shaped contact seat are connected by the annular contact strip, an electrical signal can be generated on the circuit board. The pressure value and pressure direction can be accurately monitored by the number of contacts between the ball head transmission seat and the annular contact strip. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a flowchart of the entire invention;

[0023] Figure 3 This is a schematic diagram of the structure of the sensor body of the present invention;

[0024] Figure 4 This is a cross-sectional structural diagram of the sensor body of the present invention;

[0025] Figure 5 This is a schematic diagram of the mounting structure of the contact foot pressure plate of the present invention;

[0026] Figure 6 This is a schematic diagram of the installation structure of the arc-shaped contact seat of the present invention.

[0027] In the diagram: 1. Contact cover; 2. Mounting shell; 3. Sealing base; 4. Limiting ring; 5. Positioning ring; 6. Transmission contact foot; 7. Pressure ring; 8. Elastic ring; 9. Ball head transmission seat; 10. Arc-shaped contact seat; 11. Separator plate; 12. Circuit board; 13. Wire sealing sleeve; 14. Contact foot pressure plate; 15. Annular contact strip. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Please see Figures 1 to 3 One embodiment of the present invention provides a pressure sensing system, comprising:

[0030] Keypad Display: Used to receive data and address commands and convert them into corresponding instructions, displaying pressure sensor data. It includes a display control circuit, a digital tube, and a square display bar. The digital tube displays the character information of the pressure sensor. The display control circuit consists of an LED driver IC with a keyboard scanning interface and surrounding circuitry. The LED driver IC integrates an MCU digital interface, a data latch, an LED high-voltage driving circuit, and a keyboard scanning circuit. The LED driver IC receives data and address commands transmitted from the surrounding circuitry and lights up the LEDs at the corresponding positions on the digital tube. Multiple LEDs are powered on and lit up to form displayed characters.

[0031] Calibration Calculation Module: Used to measure, calculate, and output pressure values, this module can independently and continuously correct the zero point, linearity, and temperature drift data of the pressure sensor, ensuring the accuracy and reliability of the output signal. It includes a main control chip, a buck regulator circuit, an A / D conversion circuit, an electrostatic suppression circuit, an RS-485 communication circuit, and a key control circuit. The main control chip loads the logic program and sequentially initializes the key display, sets the step value, performs zero-point calibration, and full-scale calibration. The buck regulator circuit converts the input voltage into multiple output voltage values ​​and supplies power to the main control chip, A / D conversion circuit, electrostatic suppression circuit, RS-485 communication circuit, and key control circuit. The RS-485 communication circuit supports connection between the main control chip and the RS-485 communication circuit.

[0032] Pressure sensor body: used for pressure contact and generating pressure signals, and for converting and transmitting the pressure signals to the calibration calculation module.

[0033] The A / D conversion circuit includes a power switch, an on-chip clock oscillator, and a single-ended input for battery voltage detection. The on-chip clock oscillator provides a clock reference for the A / D conversion circuit. The single-ended input for battery voltage detection is connected to a battery and reads the battery voltage value through the A / D conversion. The A / D conversion circuit is used to read the sensor's main signal.

[0034] The electrostatic discharge suppression circuit is used to respond to electrostatic surges and maintain leakage current to protect the circuit interface from electrostatic damage. The inner side of the button control circuit is equipped with a tactile switch and a capacitor. The tactile switch and the capacitor are connected in parallel. The capacitor adjusts the voltage value across the tactile switch and filters out the button bounce range of the tactile switch.

[0035] The step-down and voltage-regulating circuit reduces the external power supply voltage to a suitable level and outputs it. This output voltage then passes through an electrostatic discharge suppression circuit to power the sensor body, ensuring its normal operation. The A / D conversion circuit connects to the positive and negative signals of the sensor body, acquiring the pressure values ​​read by the sensor body and inputting them to the main control chip. The main control chip detects the keyboard status via a key control circuit, such as... Figure 2 As shown, depending on the pressed button, the system initializes the button display, sets the step value, performs zero-point calibration and full-scale calibration, and outputs the prompt information from the button display to the digital tube and the square display bar. The main control chip can communicate with the outside world through the RS-485 communication circuit.

[0036] Please see Figure 3 , Figure 4 and Figure 6 A pressure sensing device for a pressure sensing system includes a sensor body, which includes a sealed chassis 3. A mounting shell 2 is installed on the outer side of the upper end of the sealed chassis 3. The bottom end of the mounting shell 2 is threadedly connected to the sealed chassis 3. A partition plate 11 is fixedly installed on the inner side of the upper end of the sealed chassis 3. A circuit board 12 is fixedly installed on the lower end face of the partition plate 11. An arc-shaped contact seat 10 is installed on the inner side of the middle part of the partition plate 11. The bottom end of the arc-shaped contact seat 10 passes through the middle part of the partition plate 11 and is in contact with the upper end face of the circuit board 12. A ball head transmission seat 9 is installed above the arc-shaped contact seat 10. The circuit board 12 is electrically connected to both the arc-shaped contact seat 10 and the ball head transmission seat 9. The circuit board 12 monitors the connection between the ball head transmission seat 9 and the arc-shaped contact seat 10, thereby enabling the monitoring of external pressure.

[0037] A wire sealing sleeve 13 is provided in the middle of the lower end face of the circuit main board 12. The upper end of the wire sealing sleeve 13 passes through the middle of the sealing base 3 and is bonded and fixed to the circuit main board 12. Multiple annular contact strips 15 are provided between the arc-shaped contact seat 10 and the ball head transmission seat 9. The arc-shaped contact seat 10 and the multiple annular contact strips 15 are fixedly connected. The multiple annular contact strips 15 are arranged in a circle relative to the axis of the arc-shaped contact seat 10. The pressure value and pressure direction can be accurately monitored by the number of contacts between the ball head transmission seat 9 and the annular contact strips 15.

[0038] Please see Figure 4 and Figure 5 The sensor body also includes a limiting ring 4 connected to the upper end of the mounting shell 2. The upper end of the mounting shell 2 is fixedly connected to the positioning ring 5 through the limiting ring 4. Two pressure rings 7 are installed on the inner side of the bottom end of the limiting ring 4. The limiting ring 4 and the two pressure rings 7 are connected by threads. An elastic ring 8 is provided on the inner side of the two pressure rings 7. The upper end of the ball head transmission seat 9 is connected to the two pressure rings 7 through the elastic ring 8. The upper end of the ball head transmission seat 9 can be elastically installed through the elastic ring 8, so that the ball head transmission seat 9 can automatically reset when it deflects.

[0039] Multiple transmission contacts 6 are mounted on the upper end face of the ball head drive seat 9. A contact pressure plate 14 is mounted on the inner side of the upper end of the multiple transmission contacts 6. A contact cover 1 is mounted on the upper end face of the contact pressure plate 14. The middle part of the contact cover 1 is fixedly connected to the multiple transmission contacts 6 through the contact pressure plate 14. Both the contact cover 1 and the ball head drive seat 9 reciprocate relative to the axis of the arc-shaped contact seat 10. A positioning ring 5 is mounted on the outer side of the middle part of the contact cover 1. The positioning ring 5 can limit the contact cover 1 when it is deflected by external pressure.

[0040] When the pressure sensor body monitors the external pressure, the external pressure pressurizes the outer surface of the contact cover 1, and then the middle part of the contact cover 1 moves inside the positioning ring 5 and drives multiple circumferentially arranged transmission contacts 6 to swing synchronously through the contact foot pressure plate 14. The upper end of the ball head transmission seat 9 is connected to the two pressure rings 7 through the elastic ring 8, so that while the multiple transmission contacts 6 swing, they can be eccentrically pressed down on the ball head transmission seat 9, so that the ball head transmission seat 9 can be offset relative to the axis of the arc-shaped contact seat 10.

[0041] Multiple annular contact strips 15 are provided on the upper end face of the arc-shaped contact seat 10, so that when the bottom end of the ball head transmission seat 9 is offset, it can make contact with the corresponding annular contact strips 15 on the upper end face of the arc-shaped contact seat 10. The circuit board 12 is electrically connected to both the ball head transmission seat 9 and the arc-shaped contact seat 10. When the ball head transmission seat 9 and the arc-shaped contact seat 10 are connected through the annular contact strips 15, an electrical signal can be generated on the circuit board 12. The pressure value and pressure direction can be accurately monitored by the number of contacts between the ball head transmission seat 9 and the annular contact strips 15.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pressure sensing system, characterized in that, include: Calibration Calculation Module: Used to measure, calculate, and output pressure values, this module can independently and continuously correct the zero point, linearity, and temperature drift data of the pressure sensor, ensuring the accuracy and reliability of the output signal. It includes a main control chip, a buck regulator circuit, an A / D conversion circuit, an electrostatic suppression circuit, an RS-485 communication circuit, and a key control circuit. The main control chip loads a logic program and sequentially initializes the key display, sets the step value, performs zero-point calibration, and full-scale calibration. The buck regulator circuit converts the input voltage into multiple output voltage values ​​and supplies power to the main control chip, A / D conversion circuit, electrostatic suppression circuit, RS-485 communication circuit, and key control circuit. Pressure sensor body: used for pressure contact and generation of pressure signals, and for converting and transmitting the pressure signals to the calibration calculation module; Keypad display: Used to receive data and address commands and convert them into corresponding instructions, and to display the pressure sensor data. It includes a display control circuit, a digital tube, and a square display bar. The digital tube is used to display the character information of the pressure sensor.

2. The pressure sensing system according to claim 1, characterized in that: The display control circuit consists of an LED driver IC with a keyboard scanning interface and surrounding circuitry. The LED driver IC integrates an MCU digital interface, a data latch, an LED high-voltage driving circuit, and a keyboard scanning circuit. The LED driver IC receives data and address commands transmitted from the surrounding circuitry and illuminates the corresponding LEDs on the digital tube. Multiple LEDs are powered on and illuminated to form display characters.

3. The pressure sensing system according to claim 1, characterized in that: The A / D conversion circuit includes a power switch, an on-chip clock oscillator, and a single-ended input for battery voltage detection. The on-chip clock oscillator provides a clock reference for the A / D conversion circuit. The single-ended input for battery voltage detection is connected to a battery and reads the battery voltage value through the A / D conversion. The A / D conversion circuit is used to read the sensor main signal.

4. The pressure sensing system according to claim 1, characterized in that: The electrostatic discharge suppression circuit is used to respond to electrostatic surges and maintain leakage current protection of the circuit interface. The RS-485 communication circuit supports the connection between the main control chip and the RS-485 communication circuit.

5. A pressure sensing system according to claim 1, characterized in that: The inner side of the button control circuit is provided with a tactile switch and a capacitor. The tactile switch and the capacitor are connected in parallel. The capacitor adjusts the voltage value across the tactile switch and filters out the button bounce range of the tactile switch.

6. A pressure sensing device for use in the pressure sensing system according to any one of claims 1-5, comprising a sensor body, characterized in that: The sensor body includes a sealed chassis (3), an mounting shell (2) is installed on the outer side of the upper end of the sealed chassis (3), a partition plate (11) is fixedly installed on the inner side of the upper end of the sealed chassis (3), a circuit board (12) is fixedly installed on the lower end face of the partition plate (11), a wire sealing sleeve (13) is provided in the middle of the lower end face of the circuit board (12), an arc-shaped contact seat (10) is installed on the inner side of the middle of the partition plate (11), a ball head transmission seat (9) is installed above the arc-shaped contact seat (10), and multiple annular contact strips (15) are provided between the arc-shaped contact seat (10) and the ball head transmission seat (9).

7. The pressure sensing device of the pressure sensing system according to claim 6, characterized in that: The sensor body also includes a limiting ring (4) connected to the upper end of the mounting shell (2). Two pressure rings (7) are installed on the inner side of the bottom end of the limiting ring (4). An elastic ring (8) is provided on the inner side of the two pressure rings (7). Multiple transmission feet (6) are installed on the upper end face of the ball head transmission seat (9). A contact foot pressure plate (14) is installed on the inner side of the upper end of the multiple transmission feet (6). A contact cover (1) is installed on the upper end face of the contact foot pressure plate (14). A positioning ring (5) is installed on the outer side of the middle part of the contact cover (1).

8. The pressure sensing device of the pressure sensing system according to claim 7, characterized in that: The bottom end of the mounting shell (2) is connected to the sealing chassis (3) by a thread. The upper end of the wire sealing sleeve (13) passes through the middle of the sealing chassis (3) and is bonded and fixed to the circuit board (12). The bottom end of the arc-shaped contact seat (10) passes through the middle of the partition plate (11) and is in contact with the upper surface of the circuit board (12).

9. The pressure sensing device of the pressure sensing system according to claim 8, characterized in that: The circuit board (12) is electrically connected to the arc-shaped contact seat (10) and the ball head transmission seat (9). The arc-shaped contact seat (10) is fixedly connected to a plurality of annular contact strips (15). The plurality of annular contact strips (15) are arranged in a circle relative to the axis of the arc-shaped contact seat (10).

10. The pressure sensing device of a pressure sensing system according to claim 9, characterized in that: The upper end of the mounting shell (2) is fixedly connected to the positioning ring (5) through the limiting ring (4). The limiting ring (4) is connected to the two pressure rings (7) through threads. The upper end of the ball head transmission seat (9) is connected to the two pressure rings (7) through the elastic ring (8). The middle part of the contact cover (1) is fixedly connected to multiple transmission feet (6) through the contact foot pressure plate (14). The contact cover (1) and the ball head transmission seat (9) both reciprocate relative to the axis of the arc-shaped contact seat (10).

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