Automatic monitoring and alarming system for fluid pressure

Abstract

The utility model relates to a fluid pressure automatic monitoring alarm system, which relates to the field of fluid pressure measurement and comprises an upstream detection device, a downstream detection device, a mean value device, a pressure reference device, a pressure comparison device, a pressure control device and a pressure alarm device. The downstream detection device is used for detecting downstream pressure signals, the averaging device is connected with the upstream detection device and the downstream detection device to output averaging signals, the pressure reference device is used for providing reference pressure signals, and the pressure comparison device is connected with the averaging device and the pressure reference device to output pressure comparison signals. The pressure control device is connected with the pressure comparison device to output a pressure control signal, and the pressure alarm device is connected with the pressure control device to respond to the pressure control signal to control on and off of the pressure alarm. The system has the effects of improving the operation stability of the automatic fluid pressure monitoring and warning system and reducing the operation fluctuation of the system.

Description

Technical Field

[0001] This utility model relates to the field of fluid pressure measurement, and more particularly to an automatic fluid pressure monitoring and alarm system. Background Technology

[0002] Automatic fluid pressure monitoring refers to a technology that uses intelligent sensors and monitoring systems to monitor the pressure in a fluid system in real time and issue an alarm when the pressure exceeds a preset range.

[0003] In existing technologies, fluid pressure automatic monitoring and warning systems are commonly used in industrial production, pipeline transportation, chemical industry, petroleum and other fields to ensure the safe operation of fluid systems. Fluid pressure automatic monitoring generally reads the instantaneous pressure value in the fluid system in real time and makes feedback based on the instantaneous pressure value.

[0004] Pressure changes rapidly within a fluid system, and using instantaneous values ​​for feedback can easily lead to fluctuations in system operation, which in turn reduces the system's lifespan. Utility Model Content

[0005] In order to improve the stability of the automatic fluid pressure monitoring and warning system and reduce the fluctuations in system operation, this utility model provides an automatic fluid pressure monitoring and alarm system.

[0006] The fluid pressure automatic monitoring and alarm system provided by this utility model adopts the following technical solution:

[0007] An automatic fluid pressure monitoring and alarm system includes an upstream detection device, a downstream detection device, an averaging device, a pressure reference device, a pressure comparison device, a pressure control device, and a pressure alarm device. The upstream detection device detects pressure physical quantities upstream of the fluid and converts them into upstream pressure signals. The downstream detection device detects pressure physical quantities downstream of the fluid and converts them into downstream pressure signals. The averaging device is connected to the upstream and downstream detection devices to receive the upstream and downstream pressure signals and output an averaging signal. The pressure reference device provides a reference pressure signal. The pressure comparison device is connected to the averaging device and the pressure reference device to receive the averaging signal and the reference pressure signal and output a pressure comparison signal. The pressure control device is connected to the pressure comparison device to receive the pressure comparison signal and output a pressure control signal. The pressure alarm device is connected to the pressure control device to receive the pressure control signal and, in response to the pressure control signal, control the opening and closing of the pressure alarm.

[0008] When the fluid pressure is high, the upstream detection device outputs a high-level upstream pressure signal, the downstream detection device outputs a high-level downstream pressure signal, the averaging device receives the high-level upstream and downstream pressure signals and outputs a high-level averaging signal, the pressure comparison device receives the high-level averaging signal and the reference pressure signal and outputs a high-level pressure comparison signal, the pressure control device receives the high-level pressure comparison signal and outputs a high-level pressure control signal, and the pressure alarm device receives the high-level pressure control signal and responds to the pressure control signal to control the pressure alarm to open.

[0009] When the fluid pressure is low, the upstream detection device outputs a low-level upstream pressure signal, the downstream detection device outputs a low-level downstream pressure signal, the averaging device receives the low-level upstream and downstream pressure signals and outputs a low-level averaging signal, the pressure comparison device receives the low-level averaging signal and the reference pressure signal and outputs a low-level pressure comparison signal, the pressure control device receives the low-level pressure comparison signal and outputs a low-level pressure control signal, and the pressure alarm device receives the low-level pressure control signal and responds to the pressure control signal to control the pressure alarm to close.

[0010] By adopting the above technical solution, multiple pressure values ​​in the fluid system can be read simultaneously, and the average value of the multiple pressure values ​​can be calculated to operate the system based on the average value. This improves the accuracy of fluid pressure measurement, reduces the fluctuations in system operation caused by instantaneous values, and enhances the stability of the automatic fluid pressure monitoring and warning system.

[0011] Optionally, the averaging device includes a calculation module and an inverting module. The calculation module is connected to the upstream detection device and the downstream detection device to receive the upstream pressure signal and the downstream pressure signal and output an inverted calculation signal. The inverting module is connected to the calculation module to receive the inverted calculation signal and output an averaging signal.

[0012] When the fluid pressure is high, the calculation module receives the high-level upstream pressure signal and downstream pressure signal and outputs the low-level inverted calculation signal. The inverting module receives the low-level inverted calculation signal and outputs the high-level average signal.

[0013] When the fluid pressure is low, the calculation module receives the low-level upstream pressure signal and downstream pressure signal and outputs the high-level inverted calculation signal. The inverting module receives the high-level inverted calculation signal and outputs the low-level average signal.

[0014] By adopting the above technical solution, the calculation module first calculates the inverted signal of the average value of the upstream pressure signal and the downstream pressure signal, and then the inverting module inverts the inverted signal of the average value to obtain the positive average signal.

[0015] Optionally, the calculation module includes an arithmetic unit and a scaling unit. The arithmetic unit is used to calculate the sum of the upstream pressure signal and the downstream pressure signal, and the scaling unit is used to scale the value output by the arithmetic unit.

[0016] By adopting the above technical solution, the sum of the upstream pressure signal and the downstream pressure signal is first calculated by the arithmetic unit, and then the sum of the upstream pressure signal and the downstream pressure signal is scaled to one-half by the proportional unit, thereby obtaining the average value of the upstream pressure signal and the downstream pressure signal.

[0017] Optionally, the averaging device further includes a protection module, which connects the calculation module and the inverting module and protects the inverting module.

[0018] By adopting the above technical solution, the current passing through the inverting module is limited by the protection module, thereby reducing the possibility of damage to the inverting module caused by excessive inverting calculation signals passing through it, and improving the stability of the averaging device operation.

[0019] Optionally, it also includes a verification device, a verification control device, and a circuit breaker device. The verification device is connected to the upstream detection device and the downstream detection device to receive the upstream pressure signal and the downstream pressure signal and output a verification signal. The verification control device is connected to the verification device to receive the verification signal and output a verification control signal. The circuit breaker device is connected to the verification control device to receive the verification control signal and respond to the verification control signal to control the conduction state between the pressure comparison device and the averaging device.

[0020] When the verification device outputs a high-level verification signal, the verification control device receives the high-level verification signal and outputs a high-level verification control signal. The circuit breaker receives the high-level verification control signal and responds to the verification control signal to control the disconnection between the pressure comparison device and the averaging device.

[0021] When the verification device outputs a low-level verification signal, the verification control device receives the low-level verification signal and outputs a low-level verification control signal. The circuit breaker receives the low-level verification control signal and responds to the verification control signal to control the connection between the pressure comparison device and the averaging device.

[0022] By adopting the above technical solution, the upstream and downstream pressure signals are verified by the verification device, and when there is an erroneous signal in the upstream or downstream pressure signals, the circuit breaker device prevents the system from feeding back based on the erroneous upstream or downstream pressure signal, thereby improving the stability of the automatic fluid pressure monitoring and warning system.

[0023] Optionally, it also includes a lighting device, which is connected to the verification control device to receive a verification control signal and control the lighting in response to the verification control signal.

[0024] When the verification control device outputs a high-level verification control signal, the lighting device receives the high-level verification control signal and responds to the verification control signal to control the lights to turn on.

[0025] When the verification control device outputs a low-level verification control signal, the lighting device receives the low-level verification control signal and responds to the verification control signal to control the lights to turn off.

[0026] By adopting the above technical solution, when there are erroneous signals in the upstream and downstream pressure signals, the staff will be notified of the data error through the light device, thereby prompting the staff to repair the fluid pressure automatic monitoring and warning system in a timely manner, thus improving the stability of the fluid pressure automatic monitoring and warning system.

[0027] Optionally, the verification device includes a difference module, a difference reference module, and a difference comparison module. The difference module is connected to the upstream detection device and the downstream detection device to receive the upstream pressure signal and the downstream pressure signal and output a difference signal. The difference reference module is used to provide a reference difference signal. The difference comparison module is connected to the difference module and the difference reference module to receive the difference signal and the reference difference signal and output a verification signal.

[0028] When the difference signal is greater than the reference difference signal, the difference comparison module outputs a high-level verification signal;

[0029] When the difference signal is not greater than the reference difference signal, the difference comparison module outputs a low-level verification signal.

[0030] By adopting the above technical solution, the pressure difference between different locations in the same fluid system is small, and the pressure value at the upstream location is generally higher than that at the downstream location. The difference between the upstream pressure signal and the downstream pressure signal is calculated to determine whether there is a situation where the difference between the upstream pressure signal and the downstream pressure signal is too large. Then, when there is a situation where the difference between the upstream pressure signal and the downstream pressure signal is too large, it is determined that there is a data error.

[0031] Optionally, the difference module includes an operational amplifier unit and a negative feedback unit, which are used to form a negative feedback difference loop to calculate the difference between the upstream pressure signal and the downstream pressure signal.

[0032] By adopting the above technical solution, the difference between the upstream pressure signal and the downstream pressure signal is calculated using a negative feedback loop, thereby improving the accuracy of the difference calculated from the upstream pressure signal and the downstream pressure signal, and improving the stability of the calibration device operation.

[0033] Optionally, the difference module further includes an input unit, which is used to input the upstream pressure signal and the downstream pressure signal into the operational amplifier unit respectively and to protect the operational amplifier unit.

[0034] By adopting the above technical solution, the input unit is used to limit the current through the operational amplifier unit, thereby reducing the possibility of damage to the operational amplifier unit caused by excessive upstream and downstream pressure signals passing through it, and improving the stability of the calibration device.

[0035] Optionally, the difference module further includes a scaling unit, which is used in conjunction with the input unit to scale the magnitude of the upstream pressure signal.

[0036] By adopting the above technical solution, the ratio between the scaling unit and the input unit is adjusted by adjusting the resistance value of the scaling unit, thereby adjusting the proportion of the upstream pressure signal input to the operational amplifier unit, so that half of the upstream pressure signal is input to the operational amplifier unit to improve the accuracy of the difference signal.

[0037] In summary, this utility model has at least one of the following beneficial technical effects:

[0038] 1. Simultaneously read multiple pressure values ​​within the fluid system and calculate the average value of these multiple pressure values ​​to operate the system based on the average value, thereby improving the accuracy of fluid pressure measurement, reducing system operation fluctuations caused by instantaneous values, and improving the stability of the automatic fluid pressure monitoring and warning system.

[0039] 2. The upstream and downstream pressure signals are verified by a verification device, and when an erroneous signal is found in either the upstream or downstream pressure signal, the system is prevented from providing feedback based on the erroneous upstream or downstream pressure signal by a circuit breaker device, thereby improving the stability of the automatic fluid pressure monitoring and warning system.

[0040] 3. The pressure difference between different locations in the same fluid system is small, and the pressure value at the upstream location is generally higher than that at the downstream location. The difference between the upstream and downstream pressure signals is calculated to determine whether there is a situation where the difference between the upstream and downstream pressure signals is too large. Then, if there is a situation where the difference between the upstream and downstream pressure signals is too large, it is determined that there is a data error. Attached Figure Description

[0041] Figure 1 This is a circuit diagram of an automatic fluid pressure monitoring and alarm system.

[0042] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Upstream detection device; 2. Downstream detection device; 3. Averaging device; 4. Pressure reference device; 5. Pressure comparison device; 6. Pressure control device; 7. Pressure alarm device; 8. Calculation module; 9. Inverting module; 10. Calculation unit; 11. Proportional unit; 12. Protection module; 13. Verification device; 14. Verification control device; 15. Circuit breaker device; 16. Lighting device; 17. Difference module; 18. Difference reference module; 19. Difference comparison module; 20. Operational amplifier unit; 21. Negative feedback unit; 22. Input unit; 23. Scaling unit. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0044] This utility model discloses an automatic fluid pressure monitoring and alarm system. (Refer to...) Figure 1 An automatic fluid pressure monitoring and alarm system includes an upstream detection device 1, a downstream detection device 2, an averaging device 3, a pressure reference device 4, a pressure comparison device 5, a pressure control device 6, a calibration device 13, a calibration control device 14, a circuit breaker device 15, a lighting device 16, and a pressure alarm device 7. The upstream detection device 1 detects the pressure physical quantity upstream of the fluid and converts it into an upstream pressure signal. The downstream detection device 2 detects the pressure physical quantity downstream of the fluid and converts it into a downstream pressure signal. The averaging device 3 is connected to the upstream and downstream detection devices 1 and 2 to receive the upstream and downstream pressure signals and output an average signal. The pressure reference device 4 provides a reference pressure signal. The pressure comparison device 5 is connected to the averaging device 3 and the pressure reference device 4 to receive the average signal and the reference pressure signal and output a pressure comparison signal. The pressure control device 6 is connected to the pressure comparison device 5 to receive the pressure comparison signal and output the pressure control signal. The calibration device 13 is connected to the upstream detection device 1 and the downstream detection device 2 to receive the upstream pressure signal and the downstream pressure signal and output the calibration signal. The calibration control device 14 is connected to the calibration device 13 to receive the calibration signal and output the calibration control signal. The circuit breaker device 15 is connected to the calibration control device 14 to receive the calibration control signal and respond to the calibration control signal to control the conduction state between the pressure comparison device 5 and the averaging device 3. The lighting device 16 is connected to the calibration control device 14 to receive the calibration control signal and respond to the calibration control signal to control the opening and closing of the lights. The pressure alarm device 7 is connected to the pressure control device 6 to receive the pressure control signal and respond to the pressure control signal to control the opening and closing of the pressure alarm.

[0045] The upstream detection device 1 includes a varistor RY1 and a resistor R1. The varistor RY1 is a varistor with a negative coefficient. The downstream detection device 2 includes a varistor RY2 and a resistor R2. The varistor RY2 is a varistor with a negative coefficient.

[0046] The averaging device 3 includes a calculation module 8, an inverting module 9, and a protection module 12. The calculation module 8 is connected to the upstream detection device 1 and the downstream detection device 2 to receive the upstream pressure signal and the downstream pressure signal and output an inverted calculation signal. The inverting module 9 is connected to the calculation module 8 to receive the inverted calculation signal and output an averaging signal. The protection module 12 is used to connect the calculation module 8 and the inverting module 9 and to protect the inverting module 9.

[0047] The calculation module 8 includes an arithmetic unit 10 and a scaling unit 11. The arithmetic unit 10 is used to calculate the sum of the upstream pressure signal and the downstream pressure signal. The scaling unit 11 is used to scale the value output by the arithmetic unit 10. The arithmetic unit 10 includes an operational amplifier N1 and a resistor R5. The operational amplifier N1 and the resistor R5 form a negative feedback loop. The scaling unit 11 includes a resistor R3 and a resistor R4, where R3 = R4 = 2 * R5.

[0048] The inverting module 9 includes operational amplifier N2 and resistor R7, which form a negative feedback loop. The protection module 12 includes resistor R6.

[0049] The pressure reference device 4 includes resistors R15, R16 and R17, and the pressure comparison device 5 includes comparator N5, which can be a comparator chip of model TLV1701AIDCLKR.

[0050] The calibration device 13 includes a difference module 17, a difference reference module 18, and a difference comparison module 19. The difference module 17 is connected to the upstream detection device 1 and the downstream detection device 2 to receive the upstream pressure signal and the downstream pressure signal and output the difference signal. The difference reference module 18 is used to provide a reference difference signal. The difference comparison module 19 is connected to the difference module 17 and the difference reference module 18 to receive the difference signal and the reference difference signal and output the calibration signal.

[0051] The difference module 17 includes an operational amplifier unit 20, a negative feedback unit 21, an input unit 22, and a scaling unit 23. The operational amplifier unit 20 and the negative feedback unit 21 are used to form a negative feedback difference loop to calculate the difference between the upstream pressure signal and the downstream pressure signal. The input unit 22 is used to input the upstream pressure signal and the downstream pressure signal into the operational amplifier unit 20 respectively and to protect the operational amplifier unit 20. The scaling unit 23 is used to cooperate with the input unit 22 to scale the magnitude of the upstream pressure signal.

[0052] Operational amplifier unit 20 includes operational amplifier N3, negative feedback unit 21 includes resistor R9, operational amplifier N3 and resistor R9 form a negative feedback loop, input unit 22 includes resistor R8 and resistor R10, and scaling unit 23 includes resistor R11, where R8=R9=R10=R11.

[0053] The difference reference module 18 includes resistors R12, R13 and R14, and the difference comparison module 19 includes comparator N4, which can be a comparator chip of model TLV1701AIDCLKR.

[0054] The verification control device 14 includes a transistor Q1, which is an NPN transistor of type 9013. The circuit breaking device 15 includes a relay KM1 and a normally closed contact KM1-1. The relay KM1 can be an electromagnetic relay of type JQX-13F. The lighting device 16 includes a light-emitting diode (LED).

[0055] The pressure control device 6 includes a transistor Q2, which is an NPN transistor of type 9013. The pressure alarm device 7 includes a relay KM2, a normally open contact KM2-1 of the relay, and a pressure alarm. The relay KM2 can be an electromagnetic relay of type JQX-13F.

[0056] One end of varistor RY1 is connected to the power supply VCC. The other end of varistor RY1 is connected to one end of resistor R1, then to one end of resistor R4, then to one end of resistor R10. The other end of resistor R1 is connected to ground GND. The other end of resistor R10 is connected to one end of resistor R11, then to the positive input terminal of operational amplifier N3. The other end of resistor R11 is connected to ground GND. One end of varistor RY2 is connected to the power supply VCC. The other end of varistor RY2 is connected to one end of resistor R2, then to one end of resistor R3, then to one end of resistor R8. The other end of resistor R2 is connected to ground GND. The other end of resistor R8 is connected to one end of resistor R9, then to the positive input terminal of operational amplifier N3. Connect the negative input terminal of op-amp N3. Connect the other end of resistor R9 to the output terminal of op-amp N3, and then to the positive input terminal of comparator N4. Connect one end of resistor R13 to power supply VCC. Connect the other end of resistor R13 to one end of resistor R14, and then to one end of resistor R12. Connect the other end of resistor R14 to ground GND. Connect the other end of resistor R12 to the negative input terminal of comparator N4. Connect the output terminal of comparator N4 to the base of transistor Q1. Connect the emitter of transistor Q1 to ground GND. Connect the collector of transistor Q1 to the output terminal of relay KM1. Connect the input terminal of relay KM1 to the cathode of LED. The anode of the circuit is connected to the power supply VCC. The other end of resistor R4 is connected to the other end of resistor R3, then to one end of resistor R5, and then to the negative input terminal of operational amplifier N1. The positive input terminal of operational amplifier N1 is connected to the power supply VCC, then to the positive input terminal of operational amplifier N2. The output terminal of operational amplifier N1 is connected to the other end of resistor R5, then to one end of resistor R6. The other end of resistor R6 is connected to one end of resistor R7, then to the negative input terminal of operational amplifier N2. The output terminal of operational amplifier N2 is connected to the other end of resistor R7, then to one end of the normally closed contact KM1-1 of the relay. The other end of the normally closed contact KM1-1 of the relay is connected to the positive input terminal of comparator N5. One end of resistor R16... The resistor R16 is connected to the power supply VCC. The other end of resistor R16 is connected to one end of resistor R17 and then to one end of resistor R15. The other end of resistor R17 is connected to ground GND. The other end of resistor R15 is connected to the negative input terminal of comparator N5. The output terminal of comparator N5 is connected to the base of transistor Q2. The emitter of transistor Q2 is connected to ground GND. The collector of transistor Q2 is connected to the output terminal of relay KM2. The input terminal of relay KM2 is connected to the power supply VCC. The input terminal of the pressure alarm is connected to the power supply VCC. The output terminal of the pressure alarm is connected to one end of the normally open contact KM2-1 of relay. The other end of the normally open contact KM2-1 of relay is connected to ground GND.

[0057] The implementation principle of the automatic fluid pressure monitoring and alarm system of this utility model is as follows: When the fluid pressure is high, the upstream detection device 1 outputs a high-level upstream pressure signal, the downstream detection device 2 outputs a high-level downstream pressure signal, the averaging device 3 receives the high-level upstream pressure signal and the downstream pressure signal and outputs a high-level averaging signal, the pressure comparison device 5 receives the high-level averaging signal and the reference pressure signal and outputs a high-level pressure comparison signal, the pressure control device 6 receives the high-level pressure comparison signal and outputs a high-level pressure control signal, and the pressure alarm device 7 receives the high-level pressure control signal and responds to the pressure control signal to control the pressure alarm to open.

[0058] When the fluid pressure is low, the upstream detection device 1 outputs a low-level upstream pressure signal, the downstream detection device 2 outputs a low-level downstream pressure signal, the averaging device 3 receives the low-level upstream and downstream pressure signals and outputs a low-level averaging signal, the pressure comparison device 5 receives the low-level averaging signal and the reference pressure signal and outputs a low-level pressure comparison signal, the pressure control device 6 receives the low-level pressure comparison signal and outputs a low-level pressure control signal, and the pressure alarm device 7 receives the low-level pressure control signal and responds to the pressure control signal to control the pressure alarm to close.

[0059] When the verification device 13 outputs a high-level verification signal, the verification control device 14 receives the high-level verification signal and outputs a high-level verification control signal. The circuit breaker 15 receives the high-level verification control signal and responds to the verification control signal to disconnect the pressure comparison device 5 and the averaging device 3.

[0060] When the verification device 13 outputs a low-level verification signal, the verification control device 14 receives the low-level verification signal and outputs a low-level verification control signal. The circuit breaker 15 receives the low-level verification control signal and responds to the verification control signal to control the connection between the pressure comparison device 5 and the averaging device 3.

[0061] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An automatic monitoring and alarm system for fluid pressure, characterized in that: The device includes an upstream detection device (1), a downstream detection device (2), an averaging device (3), a pressure reference device (4), a pressure comparison device (5), a pressure control device (6), and a pressure alarm device (7). The upstream detection device (1) is used to detect the pressure physical quantity upstream of the fluid and convert it into an upstream pressure signal. The downstream detection device (2) is used to detect the pressure physical quantity downstream of the fluid and convert it into a downstream pressure signal. The averaging device (3) is connected to the upstream detection device (1) and the downstream detection device (2) to receive the upstream pressure signal and the downstream pressure signal and output an averaging signal. The pressure reference device (4) is used to provide a reference pressure signal. The pressure comparison device (5) is connected to the averaging device (3) and the pressure reference device (4) to receive the averaging signal and the reference pressure signal and output a pressure comparison signal. The pressure control device (6) is connected to the pressure comparison device (5) to receive the pressure comparison signal and output a pressure control signal. The pressure alarm device (7) is connected to the pressure control device (6) to receive the pressure control signal and respond to the pressure control signal to control the opening and closing of the pressure alarm. When the fluid pressure is high, the upstream detection device (1) outputs a high-level upstream pressure signal, the downstream detection device (2) outputs a high-level downstream pressure signal, the averaging device (3) receives the high-level upstream pressure signal and downstream pressure signal and outputs a high-level averaging signal, the pressure comparison device (5) receives the high-level averaging signal and reference pressure signal and outputs a high-level pressure comparison signal, the pressure control device (6) receives the high-level pressure comparison signal and outputs a high-level pressure control signal, and the pressure alarm device (7) receives the high-level pressure control signal and responds to the pressure control signal to control the pressure alarm to open; When the fluid pressure is low, the upstream detection device (1) outputs a low-level upstream pressure signal, the downstream detection device (2) outputs a low-level downstream pressure signal, the averaging device (3) receives the low-level upstream pressure signal and downstream pressure signal and outputs a low-level averaging signal, the pressure comparison device (5) receives the low-level averaging signal and reference pressure signal and outputs a low-level pressure comparison signal, the pressure control device (6) receives the low-level pressure comparison signal and outputs a low-level pressure control signal, and the pressure alarm device (7) receives the low-level pressure control signal and responds to the pressure control signal to control the pressure alarm to close.

2. The fluid pressure automatic monitoring and alarm system according to claim 1, characterized in that: The averaging device (3) includes a calculation module (8) and an inverting module (9). The calculation module (8) is connected to the upstream detection device (1) and the downstream detection device (2) to receive the upstream pressure signal and the downstream pressure signal and output the inverted calculation signal. The inverting module (9) is connected to the calculation module (8) to receive the inverted calculation signal and output the averaging signal. When the fluid pressure is high, the calculation module (8) receives the high-level upstream pressure signal and downstream pressure signal and outputs the low-level inverted calculation signal, and the inverting module (9) receives the low-level inverted calculation signal and outputs the high-level average signal. When the fluid pressure is low, the calculation module (8) receives the low-level upstream pressure signal and downstream pressure signal and outputs the high-level inverted calculation signal, and the inverting module (9) receives the high-level inverted calculation signal and outputs the low-level average signal.

3. The fluid pressure automatic monitoring and alarm system according to claim 2, characterized in that: The calculation module (8) includes an arithmetic unit (10) and a scaling unit (11). The arithmetic unit (10) is used to calculate the sum of the upstream pressure signal and the downstream pressure signal, and the scaling unit (11) is used to scale the value output by the arithmetic unit (10).

4. The fluid pressure automatic monitoring and alarm system according to claim 2, characterized in that: The averaging device (3) further includes a protection module (12), which is used to connect the calculation module (8) and the inverting module (9) and protect the inverting module (9).

5. The fluid pressure automatic monitoring and alarm system according to claim 1, characterized in that: It also includes a verification device (13), a verification control device (14), and a circuit breaker (15). The verification device (13) is connected to the upstream detection device (1) and the downstream detection device (2) to receive the upstream pressure signal and the downstream pressure signal and output a verification signal. The verification control device (14) is connected to the verification device (13) to receive the verification signal and output a verification control signal. The circuit breaker (15) is connected to the verification control device (14) to receive the verification control signal and respond to the verification control signal to control the conduction state between the pressure comparison device (5) and the averaging device (3). When the verification device (13) outputs a high-level verification signal, the verification control device (14) receives the high-level verification signal and outputs a high-level verification control signal, and the circuit breaker device (15) receives the high-level verification control signal and responds to the verification control signal to control the disconnection between the pressure comparison device (5) and the averaging device (3). When the verification device (13) outputs a low-level verification signal, the verification control device (14) receives the low-level verification signal and outputs a low-level verification control signal. The circuit breaker (15) receives the low-level verification control signal and responds to the verification control signal to control the connection between the pressure comparison device (5) and the averaging device (3).

6. The fluid pressure automatic monitoring and alarm system according to claim 5, characterized in that: It also includes a lighting device (16), which is connected to the verification control device (14) to receive a verification control signal and respond to the verification control signal to control the opening and closing of the lights; When the verification control device (14) outputs a high-level verification control signal, the lighting device (16) receives the high-level verification control signal and responds to the verification control signal to control the lighting to turn on; When the verification control device (14) outputs a low-level verification control signal, the lighting device (16) receives the low-level verification control signal and responds to the verification control signal to control the lights to turn off.

7. The fluid pressure automatic monitoring and alarm system according to claim 5, characterized in that: The verification device (13) includes a difference module (17), a difference reference module (18), and a difference comparison module (19). The difference module (17) is connected to the upstream detection device (1) and the downstream detection device (2) to receive the upstream pressure signal and the downstream pressure signal and output the difference signal. The difference reference module (18) is used to provide a reference difference signal. The difference comparison module (19) is connected to the difference module (17) and the difference reference module (18) to receive the difference signal and the reference difference signal and output the verification signal. When the difference signal is greater than the reference difference signal, the difference comparison module (19) outputs a high-level verification signal; When the difference signal is not greater than the reference difference signal, the difference comparison module (19) outputs a low-level verification signal.

8. The fluid pressure automatic monitoring and alarm system according to claim 7, characterized in that: The difference module (17) includes an operational amplifier unit (20) and a negative feedback unit (21), which are used to form a negative feedback difference loop to calculate the difference between the upstream pressure signal and the downstream pressure signal.

9. The fluid pressure automatic monitoring and alarm system according to claim 8, characterized in that: The difference module (17) further includes an input unit (22), which is used to input the upstream pressure signal and the downstream pressure signal into the operational amplifier unit (20) respectively and protect the operational amplifier unit (20).

10. The fluid pressure automatic monitoring and alarm system according to claim 9, characterized in that: The difference module (17) also includes a scaling unit (23), which is used to work with the input unit (22) to scale the magnitude of the upstream pressure signal.

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