Intelligent ventilation monitoring and early warning algorithm

Abstract

The invention discloses an intelligent ventilation monitoring and early warning algorithm which comprises the following steps: S1, detecting the static pressure F1 of a to-be-detected ventilation pipeline by using a static pressure detection device, and detecting the total pressure F2 of the to-be-detected ventilation pipeline by using a total pressure detection device; s2, the static pressure F1 and the total pressure F2 are stored in a monitoring controller; s3, the static pressure F1 and the total pressure F2 are used for calculating the wind speed v; s4, whether the wind speed v is larger than a set value V0 or not is judged, and if yes, an over-high wind speed early warning prompt is given out; and if not, no prompt is made. The intelligent ventilation monitoring and early warning algorithm solves the problem that how to calculate the wind speed is unknown in the prior art.

Description

Technical Field

[0001] The present invention relates to the monitoring of ventilation wind speed, and more particularly to a smart ventilation monitoring and early warning algorithm. Background Art

[0002] A railway wind speed monitoring and early warning system with the application number CN202120103199.6 was disclosed in a Chinese patent. This railway wind speed monitoring and early warning system includes a collection module, a control module, a monitoring and early warning module, a power supply module, and an information storage module.

[0003] The above-mentioned railway wind speed monitoring and early warning system combines terrain factors with wind speed monitoring and early warning, and specifically controls the running speed of trains. It can also continuously input real-time wind speed data into the system, enabling the system to have the latest data, and on this basis, continuously improving the accuracy of early warning. This railway wind speed monitoring and early warning system can also be used for wind speed detection in ventilation ducts. However, the disadvantages still existing in this railway wind speed monitoring and early warning system are: it does not know how to calculate the wind speed, resulting in no comparison basis for early warning judgment. Summary of the Invention

[0004] The present invention aims to provide a smart ventilation monitoring and early warning algorithm to solve the problem in the prior art of not knowing how to calculate the wind speed.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a smart ventilation monitoring and early warning algorithm, including the following steps:

[0007] S1. Use a static pressure detection device to detect the static pressure F1 of the ventilation duct to be measured, and use a total pressure detection device to detect the total pressure F2 of the ventilation duct to be measured;

[0008] S2. Store the static pressure F1 and the total pressure F2 in the monitoring and control unit;

[0009] S3. Calculate the wind speed v using the static pressure F1 and the total pressure F2;

[0010] S4. Determine whether the wind speed v is greater than the set value V0. If so, issue an early warning prompt for excessive wind speed; if not, do not make any prompt.

[0011] Preferably, the formula for calculating the wind speed v in step S3 is: (Formula 1), where ρ is the air density.

[0012] Preferably, both the static pressure detection device and the total pressure detection device include: an air intake pipe, a pushing head, a piezoresistor, a power supply circuit, a load, an amplifier circuit, and an AD conversion circuit. The first end of the air intake pipe extends into the ventilation channel to be detected. In the static pressure detection device, a static pressure intake port is opened at the first end of the air intake pipe, and the ventilation direction of the static pressure intake port is perpendicular to the ventilation direction of the ventilation channel to be detected. In the static pressure detection device, a total pressure intake port is opened at the first end of the air intake pipe, and the ventilation direction of the total pressure intake port is parallel to the ventilation direction of the ventilation channel to be detected. A pushing head is installed at the second end of the air intake pipe, and a piezoresistor is closely attached to the pushing head. The pushing head is used to press on the piezoresistor under the push of the gas. The first output terminal of the power supply circuit is connected to the first end of the piezoresistor. The second end of the piezoresistor is grounded through the load. The second end of the piezoresistor is connected to the input terminal of the amplifier circuit. The output terminal of the amplifier circuit is connected to the input terminal of the AD conversion circuit. The output terminal of the AD conversion circuit is the output terminal of the static pressure detection device or the total pressure detection device.

[0013] Preferably, the power supply circuit outputs a voltage VCC. The output terminal voltage at the second end of the piezoresistor in the static pressure detection device is Vout1, and the load resistance value in the static pressure detection device is R1. Then, the calculation formula for the static pressure F1 is: k1 is the relationship coefficient between the piezoresistor and the static pressure F1. The output terminal voltage at the second end of the piezoresistor in the total pressure detection device is Vout2, and the load resistance value in the total pressure detection device is R2. Then, the calculation formula for the total pressure F2 is: k2 is the relationship coefficient between the piezoresistor and the static pressure F2.

[0014] Preferably, the pushing head, the piezoresistor, the power supply circuit, the load, the amplifier circuit, and the AD conversion circuit are all installed in a detection box.

[0015] Preferably, the second end of the air intake pipe in the static pressure detection device is installed in the detection box through the first mounting seat, and the second end of the air intake pipe in the static pressure detection device is installed in the detection box through the second mounting seat.

[0016] Preferably, the second end of the air intake pipe is inclined downward, and the pushing head inside the second end of the air intake pipe is supported by the strain gauge resistor.

[0017] Preferably, when there is no air flow in the ventilation pipe to be measured and the atmospheric pressure is connected, the static pressure F1 detected by the static pressure detection device is equal to F01, and the total pressure F2 detected by the total pressure detection device is equal to F02. The calculation formula for the corrected wind speed v obtained by using F01 and F02 is: (Formula 2), where ρ is the air density.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In this application, a static pressure air flow perpendicular to the ventilation direction of the ventilation duct to be detected is introduced into the ventilation duct using a static pressure detection device, and a total pressure air flow parallel to the ventilation direction of the ventilation duct to be detected is introduced into the ventilation duct using a total pressure detection device. The static pressure F1 of the static pressure air flow is detected, and the static pressure F2 of the total pressure air flow is detected. According to the wind speed calculation formula corresponding to Bernoulli's effect: Thereby, v is calculated. V0 is a value set by those skilled in the art based on experience and is a fixed value. By comparing whether v is greater than V0, early warning judgment is realized, so that there is a basis for judgment in the early warning judgment.

[0020] Other advantages, objectives, and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the static pressure detection device or the total pressure detection device in Embodiment 1.

[0022] Figure 2 It is a schematic structural diagram of the air connection pipe in Embodiment 2.

[0023] Reference numerals: air connection pipe 1, static pressure air inlet 11, total pressure air inlet 12, push head 2, piezoresistor 3, ventilation duct to be detected 4, first mounting seat 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the technical means, creative features, achieved objectives, and functions of the present invention clearer and easier to understand, the present invention will be further described below in conjunction with the drawings and specific embodiments:

[0025] Embodiment 1

[0026] The present invention discloses an intelligent ventilation monitoring and early warning algorithm, including the following steps:

[0027] S1. Use a static pressure detection device to detect the static pressure F1 of the ventilation duct to be detected, and use a total pressure detection device to detect the total pressure F2 of the ventilation duct to be detected;

[0028] S2. Store the static pressure F1 and the total pressure F2 in the monitoring control;

[0029] S3. Calculate the wind speed v using the static pressure F1 and the total pressure F2;

[0030] S4. Determine whether the wind speed v is greater than the set value V0. If so, issue an early warning prompt for excessive wind speed; if not, do not make any prompt.

[0031] In this embodiment, the formula for calculating the wind speed v in step S3 is: (Formula 1), where ρ is the air density. ρ can be obtained by querying.

[0032] In this embodiment, as Figure 1 shown, both the static pressure detection device and the total pressure detection device include: an air intake pipe, a push head, a piezoresistor, a power supply circuit (not shown in the figure, and the power supply circuit can be a battery providing 5V voltage), a load (not shown in the figure), an amplifier circuit (not shown in the figure), and an AD conversion circuit (not shown in the figure). The first end of the air intake pipe extends into the ventilation channel to be detected. In the static pressure detection device, a static pressure intake port is opened at the first end of the air intake pipe, and the ventilation direction of the static pressure intake port is perpendicular to the ventilation direction of the ventilation channel to be detected; in the static pressure detection device, a total pressure intake port is opened at the first end of the air intake pipe, and the ventilation direction of the total pressure intake port is parallel to the ventilation direction of the ventilation channel to be detected; a push head is installed at the second end of the air intake pipe, and a piezoresistor is closely attached to the push head. The push head is used to press on the piezoresistor under the push of the gas. The first output end of the power supply circuit is connected to the first end of the piezoresistor, the second end of the piezoresistor is grounded through the load, the second end of the piezoresistor is connected to the input end of the amplifier circuit, the output end of the amplifier circuit is connected to the input end of the AD conversion circuit, and the output end of the AD conversion circuit is the output end of the static pressure detection device or the total pressure detection device.

[0033] As described above, the push head is not fixed in the air intake pipe, but is positioned by the inner wall of the air intake pipe and the piezoresistor so that the push head cannot move randomly. Since the push head is not fixed in the air intake pipe, when the static pressure air flow or the total pressure air flow is pressurized on the push head, the push head has a tendency to move towards the piezoresistor. Therefore, the piezoresistor can generate a resistance change according to the pressure change, so a voltage change occurs at the connection between the piezoresistor and the load, that is, the subsequent Vout1 and Vout2 will change with the static pressure air flow pressure and the total pressure air flow pressure respectively.

[0034] In this embodiment, the load can be a resistor, and of course, it can also be other electronic components with a resistance value.

[0035] In this embodiment, the monitoring controller can be an AT89C52 chip, and of course, it can also be chips such as AT89C51 and STC89C52. The amplifier circuit can be a circuit composed of chips such as LM2904, LF353, AD827, and NE5532. Of course, it can also be an amplifier circuit composed of other types of amplifier chips. The AD conversion circuit can be a circuit composed of chips such as AD7705 and AD7711.

[0036] In this application, the output voltage of the power supply circuit is VCC; the output terminal voltage of the second end of the piezoresistor in the static pressure detection device is Vout1, and the resistance value of the load resistor in the static pressure detection device is R1. Then the calculation formula for the static pressure F1 is: k1 is the relationship coefficient between the piezoresistor and the static pressure F1; the output voltage at the second end of the piezoresistor in the total pressure detection device is Vout2, and the value of the load resistor in the total pressure detection device is R2. Then the calculation formula for the total pressure F2 is: k2 is the relationship coefficient between the piezoresistor and the static pressure F2.

[0037] As mentioned above, k1 and k2 can be obtained by testing with a standard air flow (the static pressure F1 and total pressure F2 of this standard air flow are known) before use. Therefore, k1 and k2, which are constants, can be used in subsequent use.

[0038] Preferably, the push head, piezoresistor, power supply circuit, load, amplifier circuit, and AD conversion circuit are all installed in a detection box. The detection box serves to protect the push head, piezoresistor, power supply circuit, load, amplifier circuit, and AD conversion circuit, preventing dust and the like from depositing due to exposure and affecting the operation of the push head, piezoresistor, power supply circuit, load, amplifier circuit, and AD conversion circuit.

[0039] Embodiment 2

[0040] This embodiment also includes the features of Embodiment 1 except for the wind speed calculation method. The difference between this embodiment and Embodiment 1 is that through the settings of the first mounting seat 5 and the second mounting seat, the second end of the air intake pipe 1 in the static pressure detection device is inclined downward, and the second end of the air intake pipe 1 in the static pressure detection device is inclined downward, and the wind speed is directly corrected.

[0041] In this embodiment, as Figure 2 shown, the second end of the air intake pipe 1 in the static pressure detection device is installed in the detection box through the first mounting seat 5, and the second end of the air intake pipe 1 in the static pressure detection device is installed in the detection box through the second mounting seat. The first mounting seat 5 provides an installation basis for the static pressure detection device, and the static pressure detection device provides an installation basis for the second mounting seat.

[0042] In this embodiment, as Figure 2 shown, the second end of the air intake pipe 1 is inclined downward, and the push head 2 inside the second end of the air intake pipe 1 is supported by the strain gauge resistor. Figure 2 In Figure 2 , the Y direction is the vertical direction.

[0043] In this application, breaking the traditional thinking, that is, strictly ensuring that the air intake pipe 1 in the static pressure detection device and the air intake pipe 1 in the total pressure detection device are both in the horizontal direction. Directly incline the second end of the air intake pipe 1 downward, that is, the second end of the air intake pipe 1 is lower near the strain gauge resistor and higher at the end far from the strain gauge resistor. After this design, self-calibration of the static pressure detection device and the total pressure detection device can be achieved.

[0044] Preferably, in order to achieve self-calibration of the static pressure detection device and the total pressure detection device: when there is no air flow in the ventilation duct to be measured and the atmospheric pressure is connected, the static pressure F1 detected by the static pressure detection device is equal to F01, and the total pressure F2 detected by the total pressure detection device is equal to F02. The calculation formula for the corrected wind speed v is obtained by using F01 and F02: (Formula 2), where ρ is the air density. If it is strictly horizontally set, this calibration is not required because when there is no air flow in the ventilation duct to be measured and the atmospheric pressure is connected, no pressure signal is detected by the static pressure detection device and the total pressure detection device. In this application, when there is no air flow in the ventilation duct to be measured and the atmospheric pressure is connected, the static pressure detection device and the total pressure detection device can obtain F01 and F02, so as to calculate using Formula 2 and calibrate the wind speed calculation result. Thus, the following two effects are achieved: one is to reduce the installation difficulty, without the need to ensure that the air intake pipes in the static pressure detection device and the total pressure detection device are both in the horizontal direction, nor to ensure that the air intake pipes in the static pressure detection device and the total pressure detection device are parallel to each other; the other is to achieve self-calibration of the static pressure detection device and the total pressure detection device, which is convenient for calibration.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. Intelligent ventilation monitoring and early warning algorithm, characterized in that, It includes the following steps: S1. Use a static pressure detection device to detect the static pressure F1 of the ventilation duct to be measured, and use a total pressure detection device to detect the total pressure F2 of the ventilation duct to be measured; S2. Store the static pressure F1 and the total pressure F2 in the monitoring and control unit; S3. Calculate the wind speed v using the static pressure F1 and the total pressure F2; S4. Determine whether the wind speed v is greater than the set value V0. If so, issue a warning prompt for excessive wind speed; if not, do not make any prompt.

2. The intelligent ventilation monitoring and early warning algorithm according to claim 1, wherein The formula for calculating the wind speed v in step S3 is: ρ is the air density.

3. The intelligent ventilation monitoring and early warning algorithm according to claim 1, wherein Both the static pressure detection device and the total pressure detection device include: an air connection pipe, a push head, a piezoresistor, a power supply circuit, a load, an amplifier circuit, and an AD conversion circuit. The first end of the air connection pipe extends into the ventilation channel to be detected. In the static pressure detection device, a static pressure air inlet is opened at the first end of the air connection pipe, and the ventilation direction of the static pressure air inlet is perpendicular to the ventilation direction of the ventilation channel to be detected; in the static pressure detection device, a total pressure air inlet is opened at the first end of the air connection pipe, and the ventilation direction of the total pressure air inlet is parallel to the ventilation direction of the ventilation channel to be detected; a push head is installed at the second end of the air connection pipe, and a piezoresistor is closely attached to the push head. The push head is used to press on the piezoresistor under the push of the gas. The first output end of the power supply circuit is connected to the first end of the piezoresistor, the second end of the piezoresistor is grounded through the load, the second end of the piezoresistor is connected to the input end of the amplifier circuit, the output end of the amplifier circuit is connected to the input end of the AD conversion circuit, and the output end of the AD conversion circuit is the output end of the static pressure detection device or the total pressure detection device.

4. The intelligent ventilation monitoring and early warning algorithm according to claim 3, wherein The power supply circuit outputs a voltage VCC; In the static pressure detection device, the output voltage at the second end of the piezoresistor is Vout1, and the value of the load resistor in the static pressure detection device is R1. Then the calculation formula for the static pressure F1 is: k1 is the relationship coefficient between the piezoresistor and the static pressure F1; The output voltage at the second terminal of the piezoresistor in the total pressure detection device is Vout2, and the value of the load resistor in the total pressure detection device is R2. Then the calculation formula for the total pressure F2 is: k2 is the relationship coefficient between the piezoresistor and the static pressure F2.

5. The intelligent ventilation monitoring and early warning algorithm according to claim 4, wherein The push head, the piezoresistor, the power supply circuit, the load, the amplifier circuit, and the AD conversion circuit are all installed in a detection box.

6. The intelligent ventilation monitoring and early warning algorithm according to claim 5, characterized in that, In the static pressure detection device, the second end of the air connection pipe is installed in the detection box through the first mounting seat, and in the static pressure detection device, the second end of the air connection pipe is installed in the detection box through the second mounting seat.

7. The intelligent ventilation monitoring and early warning algorithm according to claim 6, wherein The second end of the air connection pipe slopes downward, and the push head inside the second end of the air connection pipe is supported by the strain gauge resistor.

8. The intelligent ventilation monitoring and early warning algorithm according to claim 7, wherein When there is no air flow in the ventilation duct to be measured and the atmospheric pressure is connected, the static pressure F1 detected by the static pressure detection device is equal to F01, and the total pressure F2 detected by the total pressure detection device is equal to F02. The calculation formula for the corrected wind speed v is obtained by using F01 and F02: ρ is the air density.

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