Ventilation pressure sensor wiring structure

Abstract

The utility model discloses a wiring structure of a ventilation pressure sensor. The wiring structure comprises a ventilation pipeline and a wind speed testing device, a wind speed testing device is installed on the ventilation pipeline and used for testing the wind speed in the ventilation pipeline. The wind speed testing device comprises a first testing pipeline, a first air pushing assembly, a second testing pipeline, a second air pushing assembly, a first pressure sensor, a second pressure sensor, a first pressure signal processing circuit, a second pressure signal processing circuit and a controller. The first end of the first test pipeline is located in the ventilation pipeline, a first air inlet is formed in the first test pipeline, the center line of the first air inlet is perpendicular to the ventilation direction of the ventilation pipeline, the second end of the first test pipeline is located outside the ventilation pipeline, and the first test pipeline is sealed by the first air pushing assembly. The ventilation pressure sensor wiring structure solves the problem that in the prior art, marking liquid needs to be stored in a U-shaped section, and consequently the marking liquid is prone to leakage in the transportation process.

Description

Technical Field

[0001] This utility model relates to the field of ventilation pressure detection, specifically to a wiring structure for a ventilation pressure sensor. Background Technology

[0002] In existing technologies, a pitot tube is required to measure the wind speed v in the ventilation duct.

[0003] like Figure 1 As shown, the Pitot tube consists of a first-layer air inlet section, a second-layer air inlet section, and a U-shaped section. The first end of the first-layer air inlet section is located outside the first end of the second-layer air inlet section. Both the first and second ends of the first-layer air inlet sections are located within the channel to be tested, and the first end of the first-layer air inlet section is parallel to the ventilation direction of the channel to be tested. An air inlet is located on the side wall of the first end of the second-layer air inlet section, with the airflow direction perpendicular to the ventilation direction of the channel to be tested. Both the second ends of the first and second-layer air inlet sections are located outside the channel to be tested. The second end of the first-layer air inlet section is connected to the first end of the vertically placed U-shaped section, and the second end of the second-layer air inlet section is also connected to the second end of the vertically placed U-shaped section. A marking liquid is contained within the U-shaped section. During testing, the air pressure entering through the first-layer air inlet section is greater than the pressure entering through the second-layer air inlet section. According to Bernoulli's principle, the formula for calculating the wind speed v is as follows: In the formula, ρ represents the density of air. i Let ρ represent the density of the marked liquid, g represent the acceleration due to gravity, and h represent the height difference between the marked liquid surface at the first end of the U-shaped segment and the marked liquid surface at the second end of the U-shaped segment. Due to ρ, ρ i And g can be obtained directly, and the wind speed v can be detected by detecting the size of h. However, since the marking liquid needs to be stored in the U-shaped section, and the marking liquid needs to be connected to the air in the ventilation duct, it is inconvenient during transportation. The marking liquid may leak during transportation or evaporate completely, making it impossible to detect the wind speed. Utility Model Content

[0004] This invention provides a wiring structure for a ventilation pressure sensor, which solves the problem in the prior art where the labeling liquid needs to be stored in the U-shaped section, leading to easy leakage of the labeling liquid during transportation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model discloses a wiring structure for a ventilation pressure sensor, including: a ventilation duct and a wind speed testing device; the wind speed testing device is installed on the ventilation duct and is used to test the wind speed inside the ventilation duct; the wind speed testing device includes: a first test pipe, a first air thrust assembly, a second test pipe, a second air thrust assembly, a first pressure sensor, a second pressure sensor, a first pressure signal processing circuit, a second pressure signal processing circuit, and a controller; the first end of the first test pipe is located inside the ventilation duct, the first test pipe has a first air inlet, the centerline of the first air inlet is perpendicular to the ventilation direction of the ventilation duct, the second end of the first test pipe is located outside the ventilation duct, the first test pipe is sealed by the first air thrust assembly, when the air pressure in the first test pipe increases, the first air thrust assembly has a tendency to move outward, and the first air thrust assembly... A first pressure sensor is attached to the side of the first test pipe away from its second end. The output of the first pressure sensor is connected to the input of the first pressure signal processing circuit, and the output of the first pressure signal processing circuit is connected to the first input of the controller. The first end of the second test pipe is located inside the ventilation duct. The second test pipe has a second air inlet, the centerline of which is parallel to the ventilation direction of the ventilation duct. The second end of the second test pipe is located outside the ventilation duct. The second test pipe is sealed by a second air-push assembly. When the air pressure in the second test pipe increases, the second air-push assembly tends to move outward. A second pressure sensor is attached to the side of the first air-push assembly away from its second end. The output of the second pressure sensor is connected to the input of the second pressure signal processing circuit, and the output of the second pressure signal processing circuit is connected to the second input of the controller.

[0007] Preferably, the second test pipe includes: a main pipe and at least two branch pipes, the first end of the branch pipe is located inside the ventilation duct, the first end of the branch pipe is the first end of the second test pipe, the first end of the branch pipe has a second air inlet, the second ends of all branch pipes are connected to the first end of the main pipe located outside the ventilation duct, and the second end of the main pipe is the second end of the second test pipe.

[0008] Preferably, both the first and second test pipes have mounting plates welded to their outer walls, and the mounting plates are fixed to the ventilation pipes with screws.

[0009] Preferably, the first test pipe includes a bend section and an air inlet section. The first end of the air inlet section is located inside the ventilation duct and is the first end of the first test pipe. The first end of the air inlet section has a first air inlet. The second end of the air inlet section is connected to the first end of the bend section located outside the ventilation duct and is the second end of the first test pipe.

[0010] Preferably, the second end of the first test tube and the second end of the second test tube both extend into a detection box, and the first pressure sensor, the second pressure sensor, the first pressure signal processing circuit, the second pressure signal processing circuit, and the controller are installed in the detection box.

[0011] Preferably, steps are formed on the inner walls of the second end of the first test pipe and the second end of the second test pipe, and the steps restrict the movement of the first air-push assembly or the second air-push assembly into the first test pipe or the second test pipe.

[0012] Preferably, a mounting base is installed inside the detection box, the mounting base being located at the second end of the first test pipe or next to the second end of the second test pipe, and a first pressure sensor or a second pressure sensor is installed inside the mounting base.

[0013] Preferably, a positioning seat is installed on the outer wall of the ventilation duct, and a positioning strip is formed by protrusion on the side of the positioning seat. The positioning strip extends into the positioning groove of the mounting plate, and the positioning strip is parallel to the air intake direction of the first air inlet or the air intake direction of the second air inlet.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] In this application, the formula for calculating wind speed v is as follows: Δp represents the static pressure difference, and ρ represents the air density (this can be found online). Δp is obtained by subtracting the output of the first pressure signal processing circuit from the output of the second pressure signal processing circuit. The output of the first pressure signal processing circuit is the gas pressure entering from the first inlet of the first test tube, and the output of the second pressure signal processing circuit is the gas pressure entering from the second inlet of the second test tube. Therefore, this calculation method eliminates the need for a labeling liquid, avoiding the transportation problems caused by the labeling liquid and preventing the anemometer from failing due to leakage or evaporation of the labeling liquid.

[0016] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This describes the principle of Pitot tube flow velocity measurement in existing technologies.

[0018] Figure 2 This is a schematic diagram of the wiring structure for a ventilation pressure sensor.

[0019] Figure 3 This is a schematic diagram of the structure at the second end of the first test tube and the first pressure sensor.

[0020] Figure 4 This is a structural diagram of the mounting plate, positioning seat, and positioning strip.

[0021] Reference numerals: ventilation duct 1, first test duct 21, first air inlet 210, bend 211, air inlet section 212, first air propulsion assembly 22, second test duct 23, second air inlet 230, main duct 231, branch duct 232, first pressure sensor 24, mounting plate 25, positioning seat 26, detection box 3, mounting seat 30. Detailed Implementation

[0022] To make the technical means, creative features, achieved objectives and functions of this utility model clearer and easier to understand, the utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] like Figure 2 as well as Figure 3 As shown, this utility model discloses a wiring structure for a ventilation pressure sensor, including: a ventilation duct 1 and a wind speed testing device; the wind speed testing device is installed on the ventilation duct 1 and is used to test the wind speed inside the ventilation duct 1; the wind speed testing device includes: a first test pipe 21, a first air thrust assembly 22, a second test pipe 23, a second air thrust assembly (not shown in the figure), a first pressure sensor 24, a second pressure sensor (not shown in the figure), a first pressure signal processing circuit (not shown in the figure), a second pressure signal processing circuit (not shown in the figure), and a controller (not shown in the figure); the first end of the first test pipe 21 is located inside the ventilation duct 1, the first test pipe 21 has a first air inlet 210, the center line of the first air inlet 210 is perpendicular to the ventilation direction of the ventilation duct 1, the second end of the first test pipe 21 is located outside the ventilation duct 1, the first test pipe 21 is sealed by the first air thrust assembly 22, when the air pressure in the first test pipe 21 increases, the first air thrust assembly... The first test pipe 22 has an outward tendency to move. A first pressure sensor 24 is attached to the side of the first air-push assembly 22 away from the second end of the first test pipe 21. The output of the first pressure sensor 24 is connected to the input of the first pressure signal processing circuit, and the output of the first pressure signal processing circuit is connected to the first input of the controller. The first end of the second test pipe 23 is located inside the ventilation duct 1. The second test pipe 23 has a second air inlet 230, the centerline of which is parallel to the ventilation direction of the ventilation duct 1. The second end of the second test pipe 23 is located outside the ventilation duct 1. The second test pipe 23 is sealed by the second air-push assembly. When the air pressure in the second test pipe 23 increases, the second air-push assembly has an outward tendency to move. A second pressure sensor is attached to the side of the first air-push assembly 22 away from the second end of the first test pipe 21. The output of the second pressure sensor is connected to the input of the second pressure signal processing circuit, and the output of the second pressure signal processing circuit is connected to the second input of the controller. [The diagram shows the structure of the second end of the second test pipe and the second pressure sensor.] Figure 3 Consistent.

[0024] In this embodiment, when the air pressure in the first test pipe 21 increases, the first air-push assembly 22 tends to move outward. This is mainly because the first test pipe 21 and the first air-push assembly 22 are not fixed within the first test pipe 21. The first test pipe 21 and the first pressure sensor 24 work together to position the first air-push assembly 22, thereby allowing the first air-push assembly 22 to apply pressure to the first pressure sensor 24 under the air pressure within the first test pipe 21. This achieves the monitoring of the air pressure entering through the first air inlet 210, which is the static pressure. When the air pressure in the second test pipe 23 increases, the second air-push assembly tends to move outward. This is mainly because the second test pipe 23 and the second air-push assembly are not fixed within the second test pipe 23. The second test pipe 23 and the second pressure sensor work together to position the second air-push assembly, thereby allowing the second air-push assembly to apply pressure to the second pressure sensor under the air pressure within the second test pipe 23. This achieves the monitoring of the air pressure entering through the second air inlet 230, which is the total pressure. The total pressure minus the static pressure equals the total pressure.

[0025] In this application, both the first pressure signal processing circuit and the second pressure signal processing circuit are composed of an amplifier chip and an AD converter. They mainly process the voltage signal corresponding to the pressure change. The voltage signal is amplified and converted from analog to digital by the first pressure signal processing circuit or the second pressure signal processing circuit, so that the controller (using an STM32 series chip, or other control type chips) can recognize it.

[0026] In this application, both the first pressure sensor 24 and the second pressure sensor can be voltage-varying resistors. One end of the voltage-varying resistor is connected to the positive terminal of the battery, and the other end is grounded through a voltage divider load (which can be a resistor). By detecting the voltage signal at the connection point between the voltage-varying resistor and the voltage divider load, the changes in total pressure and static pressure can be determined. The relationship between the voltage signal and the total pressure, and the relationship between the voltage signal and the static pressure, are obtained by testing with a standard total pressure (known data) and a standard static pressure (known data). This relationship (generally a direct proportional relationship, the ratio can be calculated) allows the controller to directly calculate the total pressure and static pressure during subsequent use, thus calculating: = Total Pressure - Static Pressure.

[0027] Preferably, the second test pipe 23 includes: a main pipe 231 and at least two branch pipes 232. The first end of the branch pipe 232 is located inside the ventilation duct 1. The first end of the branch pipe 232 is the first end of the second test pipe 23. The first end of the branch pipe 232 has a second air inlet 230. The second ends of all branch pipes 232 are connected to the first end of the main pipe 231 located outside the ventilation duct 1. The second end of the main pipe 231 is the second end of the second test pipe.

[0028] In the aforementioned second test pipe 23, there are two or more branch pipes 232. In the layout, the two branch pipes 232 can be set at different positions to allow air to enter at different positions. Theoretically, the total pressure at each position in the ventilation pipe 1 should be the same. However, in reality, there may be differences at each position in the ventilation pipe 1. Therefore, branch pipes 232 are placed at different positions to achieve air intake at different positions. This allows the main pipe 231 to be supplied with airflow corresponding to the total pressure at each position, and all airflows are mixed in the main pipe 231 to obtain a comprehensive airflow from the branch pipes 232 at each position. This has the effect of averaging the airflow supplied to the branch pipes 232 at each position, so that the detected total pressure is the comprehensive total pressure corresponding to the airflow of the straight pipes at each position, avoiding inaccurate total pressure detection caused by only supplying airflow to a certain position.

[0029] In this embodiment, as Figure 2 as well as Figure 4 As shown, mounting plates 25 are welded to the outer walls of both the first test pipe 21 and the second test pipe 23. The mounting plates 25 are fixed to the ventilation pipe 1 by screws. The mounting plates 25 are designed to allow the first test pipe 21 and the second test pipe 23 to be installed on the outer wall of the ventilation pipe 1.

[0030] As a preferred option, such as Figure 2 As shown, the first test pipe 21 includes a bend section 211 and an air inlet section 212. The first end of the air inlet section 212 is located inside the ventilation duct 1, and is the first end of the first test pipe 21. A first air inlet 210 is opened at the first end of the air inlet section 212. The second end of the air inlet section 212 is connected to the first end of the bend section 211 located outside the ventilation duct 1, and is the second end of the first test pipe. The air inlet section 212 is located inside the ventilation duct 1, and the bend section 211 guides the airflow to the first pressure sensor 24 to match the installation position of the first pressure sensor 24.

[0031] In this application, the second ends of both the first and second test tubes extend into a detection box 3. The first pressure sensor 24, the second pressure sensor, the first pressure signal processing circuit, the second pressure signal processing circuit, and the controller are installed inside the detection box 3. Installing these components inside the detection box 3 avoids external placement of the circuitry.

[0032] In this application, such as Figure 3As shown, steps are formed on the inner walls of the second ends of the first test pipe 21 and the second test pipe 23. These steps restrict the movement of the first air-push assembly 22 or the second air-push assembly into the first test pipe 21 or the second test pipe 23. The steps are designed to cooperate with the first pressure sensor 24 or the second pressure sensor to position the first air-push assembly 22 and the second air-push assembly. When the air pressure inside the first test pipe 21 and the second test pipe 23 increases, the first air-push assembly 22 tends to move towards the first pressure sensor 24, and the second air-push assembly also tends to move towards the second pressure sensor.

[0033] Preferably, a mounting base 30 is installed inside the detection box 3. The mounting base 30 is located next to the second end of the first test pipe 21 or the second end of the second test pipe 23. The first pressure sensor 24 or the second pressure sensor is installed inside the mounting base 30. The mounting base 30 enables the installation of the first pressure sensor 24 or the second pressure sensor, and the first pressure sensor 24 or the second pressure sensor can be moved freely.

[0034] In this application, such as Figure 4 As shown, a positioning seat 26 is installed on the outer wall of the ventilation duct 1. A positioning strip protrudes from the side of the positioning seat 26 and extends into the positioning groove of the mounting plate 25. The positioning strip is parallel to the air intake direction of the first air inlet 210 or the air intake direction of the second air inlet 230. Corresponding to the first test duct 21, the positioning groove allows the positioning seat 26 to be inserted in a direction parallel to the air intake direction of the first air inlet 210. Corresponding to the second test duct 23, the positioning groove allows the positioning seat 26 to be inserted in a direction parallel to the air intake direction of the second air inlet 230. This allows for indication of the directions of the first air inlet 210 and the second air inlet 230 during installation. This facilitates adjusting the direction of the first air inlet 210 to be perpendicular to the ventilation direction of the ventilation duct 1 when installing the first test duct 21, and facilitates adjusting the direction of the second air inlet 230 to be parallel to the ventilation direction of the ventilation duct 1 when installing the second test duct 23.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A vent pressure sensor wiring structure characterized by, The utility model relates to a wind speed testing device for ventilation ducts, comprising: a ventilation duct (1) and a wind speed testing device; the wind speed testing device is installed on the ventilation duct (1) and is used for testing the wind speed in the ventilation duct (1); the wind speed testing device comprises a first testing duct (21), a first air push assembly (22), a second testing duct (23), a second air push assembly, a first pressure sensor (24), a second pressure sensor, a first pressure signal processing circuit, a second pressure signal processing circuit and a controller; the first end of the first testing duct (21) is located in the ventilation duct (1), the first testing duct (21) is provided with a first air inlet (210), the center line of the first air inlet (210) is perpendicular to the ventilation direction of the ventilation duct (1), the second end of the first testing duct (21) is located outside the ventilation duct (1), the first testing duct (21) is sealed by the first air push assembly (22), the first air push assembly (22) has a tendency to move outward when the air pressure of the first testing duct (21) increases, the first pressure sensor (24) is tightly attached to the side of the first air push assembly (22) away from the second end of the first testing duct (21), the output end of the first pressure sensor (24) is connected to the input end of the first pressure signal processing circuit, and the output end of the first pressure signal processing circuit is connected to the first input end of the controller; the first end of the second testing duct (23) is located in the ventilation duct (1), the second testing duct (23) is provided with a second air inlet (230), the center line of the second air inlet (230) is parallel to the ventilation direction of the ventilation duct (1), the second end of the second testing duct (23) is located outside the ventilation duct (1), the second testing duct (23) is sealed by the second air push assembly, the second air push assembly has a tendency to move outward when the air pressure of the second testing duct (23) increases, the second pressure sensor is tightly attached to the side of the first air push assembly (22) away from the second end of the first testing duct (21), the output end of the second pressure sensor is connected to the input end of the second pressure signal processing circuit, and the output end of the second pressure signal processing circuit is connected to the second input end of the controller.

2. The vent pressure sensor wiring structure according to claim 1, wherein The second testing duct (23) comprises a main duct (231) and at least two branch ducts (232), the first end of the branch duct (232) is located in the ventilation duct (1), the first end of the branch duct (232) is the first end of the second testing duct (23), the first end of the branch duct (232) is provided with the second air inlet (230), the second ends of all the branch ducts (232) are communicated with the first end of the main duct (231) located outside the ventilation duct (1), and the second end of the main duct (231) is the second end of the second testing duct.

3. The vent pressure sensor wiring structure according to claim 2, wherein The outer walls of the first testing duct (21) and the second testing duct (23) are welded with mounting discs (25), and the mounting discs (25) are fixed to the ventilation duct (1) through screws.

4. The vent pressure sensor wiring structure according to claim 3, wherein The first test pipe (21) comprises a bend pipe section (211) and an air inlet section (212), the first end of the air inlet section (212) is located in the ventilation pipe (1), the first end of the air inlet section (212) is the first end of the first test pipe (21), the first end of the air inlet section (212) is provided with a first air inlet (210), the second end of the air inlet section (212) is in communication with the first end of the bend pipe section (211) located outside the ventilation pipe (1), and the second end of the bend pipe section (211) is the second end of the first test pipe.

5. The vent pressure sensor wiring structure according to claim 4, wherein The second end of the first test pipe and the second end of the second test pipe are both inserted into a detection box (3), the first pressure sensor (24), the second pressure sensor, the first pressure signal processing circuit, the second pressure signal processing circuit and the controller are installed in the detection box (3).

6. The vent pressure sensor wiring structure according to claim 5, wherein The inner wall of the second end of the first test pipe (21) and the second end of the second test pipe (23) is formed with a step, and the step limits the movement of the first air pushing assembly (22) or the second air pushing assembly into the first test pipe (21) or the second test pipe (23).

7. The vent pressure sensor wiring structure according to claim 6, wherein A mounting seat (30) is installed in the detection box (3), the mounting seat (30) is located beside the second end of the first test pipe (21) or the second end of the second test pipe (23), and the first pressure sensor (24) or the second pressure sensor is installed in the mounting seat (30).

8. The vent pressure sensor wiring structure according to any one of claims 3 to 7, characterized by A positioning seat (26) is installed on the outer wall of the ventilation pipe (1), the side of the positioning seat (26) is provided with a positioning strip protruding outward, the positioning strip is inserted into the positioning groove of the mounting disc (25), and the positioning strip is parallel to the air inlet direction of the first air inlet (210) or parallel to the air inlet direction of the second air inlet (230).

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