Ventilation system and its control method

Abstract

The present invention provides a ventilation system and a control method thereof, relating to the technical field of ventilation in construction tunnels. Among them, the ventilation system is used to supply air into the construction tunnel, and includes a fan, a first air duct, a pressure detection component and a controller. The air outlet of the fan is communicated with the air inlet of the first air duct; the pressure sensor is used to measure the air supply resistance of the fan; both the fan and the pressure detection component are connected to the controller, and the controller is used to adjust the rotation speed of the fan according to the air supply resistance. When using this ventilation system, after the pressure detection component measures the air supply resistance of the fan, the controller can timely adjust the rotation speed of the fan according to the air supply resistance, so as to ensure the ventilation effect; moreover, compared with manual adjustment based on experience, this ventilation system adjusts according to the air supply resistance, and the matching degree between the rotation speed of the fan and the ventilation distance is better, and the adjustment is more accurate; in addition, this ventilation system automatically adjusts the rotation speed of the fan, without setting up a dedicated operator, saving manpower.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation for construction tunnels, and more specifically, to a ventilation system and its control method. Background Art

[0002] In a construction tunnel, due to explosive explosions, the use of internal combustion engines, the release of harmful gases from the strata during excavation, etc., the environment is harsh. In order to provide a good construction environment, maintain the physical health of the operators, ensure the normal and smooth progress of the construction, improve work efficiency, ensure project quality, etc., a ventilation system needs to be installed in the tunnel during the construction process.

[0003] The ventilation system generally includes a fan, an air duct, and a variable frequency control cabinet. During the construction process, the length of the tunnel continuously increases, the ventilation distance and the length of the air duct continuously extend, and the requirement for the air volume of the fan also continuously increases. Therefore, it is necessary to adjust the operating frequency of the fan in a timely manner. In the prior art, the operating frequency of the fan is manually adjusted, resulting in the phenomena of untimely adjustment and unable to guarantee the ventilation effect. Summary of the Invention

[0004] The first object of the present invention is to provide a ventilation system to solve the technical problems in the prior art that the operating frequency of the ventilation system is manually adjusted by humans, the adjustment is not timely, and the ventilation effect cannot be guaranteed.

[0005] The ventilation system provided by the present invention is used to supply air into a construction tunnel, and includes a fan, a first air duct, a pressure detection component, and a controller. The air outlet of the fan is communicated with the air inlet of the first air duct; the pressure detection component is used to measure the air supply resistance of the fan; both the fan and the pressure detection component are connected to the controller, and the controller is used to adjust the rotation speed of the fan according to the air supply resistance.

[0006] The ventilation system provided by the present invention can produce the following beneficial effects:

[0007] The ventilation system provided by the present invention includes a pressure detection component and a controller. The pressure detection component is used to measure the air supply resistance of the fan, and the controller adjusts the rotation speed of the fan according to the measured air supply resistance. During the tunnel construction process, as the ventilation distance increases, the air supply resistance of the fan increases. When using this ventilation system, after the pressure detection component measures the air supply resistance of the fan, the controller can timely adjust the rotation speed of the fan according to the air supply resistance, thereby ensuring the ventilation effect. Moreover, compared with manual adjustment based on experience, this ventilation system adjusts according to the air supply resistance, and the matching degree between the rotation speed of the fan and the ventilation distance is better, and the adjustment is more accurate. In addition, compared with manual adjustment, this ventilation system automatically adjusts the rotation speed of the fan, without the need to set up a dedicated operator, saving manpower.

[0008] Further, the air pressure detection member includes a first pressure sensor, and the first pressure sensor is used to measure the exhaust resistance of the air outlet of the fan, and the exhaust resistance of the air outlet of the fan is the air supply resistance.

[0009] In this technical solution, the exhaust resistance of the air outlet of the fan measured by the first pressure sensor is the air supply resistance, and the controller adjusts the rotation speed of the fan according to this air supply resistance.

[0010] Further, the first pressure sensor is disposed inside the fan and close to the air outlet of the fan; or, the first pressure sensor is disposed inside the first air duct and close to the air inlet of the first air duct.

[0011] Preferably, the first pressure sensor is disposed inside the fan.

[0012] Further, the air pressure detection member includes a first pressure sensor and a second pressure sensor. The first pressure sensor is used to measure the exhaust resistance of the air outlet of the fan, and the second pressure sensor is used to measure the air inlet resistance of the air inlet of the fan. The difference between the exhaust resistance and the air inlet resistance is the air supply resistance.

[0013] In this technical solution, two pressure sensors are used to measure the air supply resistance of the fan. The exhaust resistance of the air outlet of the fan measured by the first pressure sensor minus the air inlet resistance of the air inlet of the fan measured by the second pressure sensor is the air supply resistance. Taking the air inlet resistance of the fan into account, the adjustment of the rotation speed of the fan is more accurate.

[0014] Further, the second pressure sensor is disposed inside the fan and close to the air inlet of the fan.

[0015] Further, the air inlet of the fan is directly communicated with the atmosphere.

[0016] In this technical solution, the fan directly intakes air from the atmosphere, and the air inlet resistance is small.

[0017] Further, the ventilation system further includes a second air duct, and the air inlet of the fan is communicated with the air outlet of the second air duct.

[0018] In this technical solution, the fan intakes air from the second air duct.

[0019] Further, the second pressure sensor is disposed inside the fan and close to the air inlet of the fan; or, the second pressure sensor is disposed inside the second air duct and close to the air outlet of the second air duct.

[0020] Preferably, the second pressure sensor is disposed inside the fan.

[0021] The second object of the present invention is to provide a ventilation system control method to solve the technical problems existing in the prior art that the operation frequency of the ventilation system is manually adjusted by humans, the adjustment is not timely, and the ventilation effect cannot be guaranteed.

[0022] The ventilation system control method provided by the present invention is used for the ventilation system and includes:

[0023] Obtain the air supply resistance of the fan;

[0024] According to the air supply resistance and the preset air volume that the fan needs to reach, obtain the minimum rotational speed of the fan;

[0025] Control the rotational speed of the fan to be greater than or equal to the minimum rotational speed.

[0026] The ventilation system control method provided by the present invention can produce the following beneficial effects:

[0027] The ventilation system control method provided by the present invention determines the minimum rotational speed of the fan according to the air supply resistance of the fan and the preset air volume that the fan needs to reach, and makes the rotational speed of the fan greater than or equal to the minimum rotational speed. During the tunnel construction process, as the ventilation distance increases, the air supply resistance of the fan increases. Using this ventilation system control method, the controller can timely adjust the rotational speed of the fan after obtaining the air supply resistance, thereby ensuring the ventilation effect. Moreover, compared with manual adjustment based on experience, this ventilation system control method adjusts according to the air supply resistance, and the matching degree between the rotational speed of the fan and the ventilation distance is better, and the adjustment is more accurate. In addition, using this ventilation system control method, no special operator needs to be set, saving manpower.

[0028] Further, the step of obtaining the air supply resistance of the fan includes:

[0029] Measure the exhaust resistance at the air outlet of the fan, and use the exhaust resistance as the air supply resistance;

[0030] Alternatively, measure the exhaust resistance at the air outlet of the fan and the intake resistance at the air inlet of the fan, and use the difference between the exhaust resistance and the intake resistance as the air supply resistance.

[0031] Further, the step of obtaining the minimum rotational speed of the fan according to the air supply resistance and the preset air volume that the fan needs to reach includes:

[0032] Based on the pressure-air volume characteristic curve of the fan, determine the rotational speed corresponding to the air supply resistance and the preset air volume, that is, the minimum rotational speed.

[0033] Further, the step of controlling the rotational speed of the fan to be greater than or equal to the minimum rotational speed includes:

[0034] Determine whether the rotational speed of the fan is less than the minimum rotational speed; if so, control the fan to increase its rotational speed to be greater than or equal to the minimum rotational speed.

[0035] In this technical solution, when the rotational speed of the fan is less than the minimum rotational speed, the fan is controlled to increase its rotational speed, so as to ensure that the rotational speed of the fan is greater than or equal to the minimum rotational speed, thereby meeting the air volume requirement. Brief Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0037] Figure 1 It is a partial schematic diagram of one form of the ventilation system provided by the embodiment of the present invention;

[0038] Figure 2 It is a partial schematic diagram of another form of the ventilation system provided by the embodiment of the present invention;

[0039] Figure 3 It is a partial schematic diagram of yet another form of the ventilation system provided by the embodiment of the present invention;

[0040] Figure 4 It is a first flowchart of the ventilation system control method provided by the embodiment of the present invention;

[0041] Figure 5 It is a second flowchart of the ventilation system control method provided by the embodiment of the present invention;

[0042] Figure 6 It is a schematic diagram of the pressure-air volume characteristic curve of the fan of the ventilation system provided by the embodiment of the present invention.

[0043] Drawings:

[0044] 100 - Fan;

[0045] 200 - First air duct;

[0046] 300 - First pressure sensor;

[0047] 400 - Second pressure sensor;

[0048] 500 - Second air duct;

[0049] 600 - Control cabinet. Detailed Embodiments

[0050] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0051] Figure 1 It is a partial schematic diagram of one form of the ventilation system provided in this embodiment. Figure 2 It is a partial schematic diagram of a second form of the ventilation system provided in this embodiment. Figure 3 It is a partial schematic diagram of a third form of the ventilation system provided in this embodiment.

[0052] This embodiment provides a ventilation system for supplying air into a construction tunnel. As Figures 1 to 3 shown, the ventilation system includes a fan 100, a first air duct 200, a pressure detection component, and a controller. The air outlet of the fan 100 is communicated with the air inlet of the first air duct 200. The pressure detection component is used to measure the air supply resistance of the fan 100. Both the fan 100 and the pressure detection component are connected to the controller, and the controller is used to adjust the rotation speed of the fan 100 according to the air supply resistance.

[0053] The ventilation system provided in this embodiment includes a pressure detection component and a controller. The pressure detection component is used to measure the air supply resistance of the fan 100, and the controller adjusts the rotation speed of the fan 100 according to the measured air supply resistance. During the tunnel construction process, as the ventilation distance increases, the air supply resistance of the fan 100 increases. Using this ventilation system, when the pressure detection component measures the air supply resistance of the fan 100, the controller can timely adjust the rotation speed of the fan 100 according to the air supply resistance, thereby ensuring the ventilation effect. Furthermore, compared with manual adjustment based on experience, this ventilation system adjusts according to the air supply resistance, and the matching degree between the rotation speed of the fan 100 and the ventilation distance is better, and the adjustment is more accurate. In addition, compared with manual adjustment, this ventilation system automatically adjusts the rotation speed of the fan 100, without the need to set up a dedicated operator, saving manpower.

[0054] In this embodiment, continuing as Figures 1 to 3 shown, the ventilation system is provided with a control cabinet 600, and the controller is located inside the control cabinet 600.

[0055] In this embodiment, as Figure 1 shown, in the ventilation system of the first form, the pressure detection component includes a first pressure sensor 300. The first pressure sensor 300 is used to measure the exhaust resistance at the air outlet of the fan 100, and the exhaust resistance at the air outlet of the fan 100 is the air supply resistance. The exhaust resistance at the air outlet of the fan 100 measured by the first pressure sensor 300 is the air supply resistance, and the controller adjusts the rotation speed of the fan 100 according to this air supply resistance.

[0056] More specifically, in the first form of the ventilation system, the first pressure sensor 300 is disposed within the blower 100 and near the air outlet of the blower 100.

[0057] It should be noted that in other embodiments of the present application, the first pressure sensor 300 may also be disposed within the first air duct 200 and near the air inlet of the first air duct 200.

[0058] In this embodiment, as Figure 2 shown, the difference between the second form of the ventilation system and the first form of the ventilation system is that: the air pressure detection member includes a first pressure sensor 300 and a second pressure sensor 400. The first pressure sensor 300 is used to measure the exhaust resistance at the air outlet of the blower 100, and the second pressure sensor 400 is used to measure the intake resistance at the air inlet of the blower 100. The difference between the exhaust resistance and the intake resistance is the air supply resistance. The two pressure sensors are used to measure the air supply resistance of the blower 100. The exhaust resistance at the air outlet of the blower 100 measured by the first pressure sensor 300 minus the intake resistance at the air inlet of the blower 100 measured by the second pressure sensor 400 is the air supply resistance. Taking into account the intake resistance at the air inlet of the blower 100, the adjustment of the rotational speed of the blower 100 is more accurate.

[0059] Specifically, in the second form of the ventilation system, the second pressure sensor 400 is disposed within the blower 100 and near the air inlet of the blower 100.

[0060] In this embodiment, as Figure 1 and Figure 2 shown, in the first form of the ventilation system and the second form of the ventilation system, the air inlet of the blower 100 is directly communicated with the atmosphere. Such an arrangement enables the blower 100 to directly intake air from the atmosphere, and the intake resistance is relatively small.

[0061] In this embodiment, as Figure 3 shown, the difference between the third form of the ventilation system and the second form of the ventilation system is that: the third form of the ventilation system further includes a second air duct 500, and the air inlet of the blower 100 is communicated with the air outlet of the second air duct 500.

[0062] It should be noted that in the third form of the ventilation system, although the second pressure sensor 400 is disposed within the blower 100, in other embodiments of the present application, the second pressure sensor 400 may also be disposed within the second air duct 500.

[0063] Figure 4 It is one of the schematic flowcharts of the ventilation system control method provided in this embodiment.

[0064] This embodiment also provides a ventilation system control method for the above ventilation system, as Figure 4As shown, the method includes:

[0065] S402 Obtain the air supply resistance of the fan 100;

[0066] In this step, the exhaust resistance at the air outlet of the fan 100 can be measured and used as the air supply resistance; alternatively, the exhaust resistance at the air outlet of the fan 100 and the air intake resistance at the air inlet of the fan 100 can be measured, and the difference between the exhaust resistance and the air intake resistance can be used as the air supply resistance.

[0067] S404 Obtain the minimum speed of the fan 100 according to the air supply resistance and the preset air volume that the fan 100 needs to reach;

[0068] In this step, the preset air volume that the fan 100 needs to reach is the air volume that the fan 100 needs to output to ensure the physical health of the operators and the smooth progress of the construction. Preferably, the preset air volume that the fan 100 needs to reach is the minimum air volume that the fan 100 needs to output to ensure the physical health of the operators and the smooth progress of the construction.

[0069] S406 Control the speed of the fan 100 to be greater than or equal to the minimum speed.

[0070] The ventilation system control method provided in this embodiment determines the minimum speed of the fan 100 according to the air supply resistance of the fan 100 and the preset air volume that the fan 100 needs to reach, and makes the speed of the fan 100 greater than or equal to the minimum speed. During the tunnel construction process, as the ventilation distance increases, the air supply resistance of the fan 100 increases. Using this ventilation system control method, compared with manual adjustment, the adjustment of the fan 100 is timely; furthermore, compared with manual adjustment based on experience, this ventilation system control method adjusts according to the air supply resistance, and the matching degree between the speed of the fan and the ventilation distance is better, and the adjustment is more accurate; in addition, using this ventilation system control method, no special operator needs to be set, saving manpower.

[0071] Specifically, in this embodiment, the step of S404 obtaining the minimum speed of the fan 100 according to the air supply resistance and the preset air volume that the fan 100 needs to reach includes: determining the speed corresponding to the air supply resistance and the preset air volume based on the pressure-air volume characteristic curve of the fan 100, that is, the minimum speed.

[0072] Figure 5 This is the second flow chart of the ventilation system control method provided in this embodiment.

[0073] Specifically, in this embodiment, as Figure 5 shown, the step of S406 controlling the speed of the fan 100 to be greater than or equal to the minimum speed includes: judging whether the speed of the fan 100 is less than the minimum speed; if so, controlling the fan 100 to increase the speed to be greater than or equal to the minimum speed, preferably, controlling the fan 100 to increase the speed to the minimum speed.

[0074] Specifically, in this embodiment, continue as Figure 5 shown, determine whether the rotational speed of the blower 100 is less than the minimum rotational speed. If not, then determine whether the rotational speed of the blower 100 is greater than the minimum rotational speed; if so, control the blower 100 to reduce its rotational speed to the minimum rotational speed, and if not, control the blower 100 to maintain its rotational speed. Such a setting enables the ventilation system to save energy to the greatest extent while ensuring the ventilation effect.

[0075] To better illustrate the effect of the ventilation system control method provided in this embodiment, now in combination with Figure 6 it is described as follows. Figure 6 is a schematic diagram of the pressure - air volume characteristic curve of the blower of the ventilation system provided in this embodiment, where H is the air pressure, Q is the air volume, R is the air supply resistance, Q min is the minimum air volume required to be output, and is also the preset air volume. When the air volume is Q min , the maximum rotational speed of the blower 100 is n max , and the minimum rotational speed is n min . When manually adjusting the rotational speed, before adjustment, the rotational speed of the blower 100 still operates at n2 or n1. When the rotational speed of the blower 100 is n2, the air pressure of the blower 100 is relatively small and the ventilation effect is poor; when the rotational speed of the blower 100 is n1, the air volume of the blower 100 is greater than Q min , wasting energy. However, by using the ventilation system control method provided in this embodiment, the rotational speed of the blower 100 can be timely adjusted to the minimum rotational speed n min , thereby avoiding the situation of poor ventilation effect or energy waste.

[0076] Finally, it should also be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0077] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a ventilation system for supplying air into a construction tunnel, characterized in that For a ventilation system, the method for controlling the ventilation system comprises the following steps: Obtain the air supply resistance of the blower (100); According to the air supply resistance and the preset air volume to be achieved by the blower (100), obtain the minimum rotational speed of the blower (100); Control the rotational speed of the blower (100) to be greater than or equal to the minimum rotational speed; The ventilation system comprises the blower (100), a first air duct (200), a pressure detection component and a controller. The air outlet of the blower (100) is communicated with the air inlet of the first air duct (200); The pressure detection component is used for measuring the air supply resistance of the blower (100); Both the blower (100) and the pressure detection component are connected to the controller, and the controller is used for adjusting the rotational speed of the blower (100) according to the air supply resistance; The pressure detection component comprises a first pressure sensor (300), and the first pressure sensor (300) is used for measuring the exhaust resistance at the air outlet of the blower (100), and the exhaust resistance at the air outlet of the blower (100) is the air supply resistance; or, the pressure detection component comprises a first pressure sensor (300) and a second pressure sensor (400), the first pressure sensor (300) is used for measuring the exhaust resistance at the air outlet of the blower (100), the second pressure sensor (400) is used for measuring the intake resistance at the air inlet of the blower (100), and the difference between the exhaust resistance and the intake resistance is the air supply resistance; The first pressure sensor (300) is arranged inside the blower (100) and close to the air outlet of the blower (100); or, the first pressure sensor (300) is arranged inside the first air duct (200) and close to the air inlet of the first air duct (200).

2. The ventilation system control method according to claim 1, characterized in that, The step of obtaining the air supply resistance of the blower (100) comprises: Measure the exhaust resistance at the air outlet of the blower (100), and use the exhaust resistance as the air supply resistance; Or, measure the exhaust resistance at the air outlet of the blower (100) and the intake resistance at the air inlet of the blower (100), and use the difference between the exhaust resistance and the intake resistance as the air supply resistance.

3. The ventilation system control method according to claim 1, characterized in that, The step of obtaining the minimum rotational speed of the blower (100) according to the air supply resistance and the preset air volume to be achieved by the blower (100) comprises: Based on the pressure - air volume characteristic curve of the blower (100), determine the rotational speed corresponding to the air supply resistance and the preset air volume, i.e., the minimum rotational speed.

4. The ventilation system control method according to claim 1, wherein The step of controlling the rotational speed of the blower (100) to be greater than or equal to the minimum rotational speed comprises: Judge whether the rotational speed of the blower (100) is less than the minimum rotational speed; if so, control the blower (100) to increase the rotational speed to be greater than or equal to the minimum rotational speed.

5. The ventilation system control method according to claim 1, characterized in that, The second pressure sensor (400) is arranged inside the blower (100) and close to the air inlet of the blower (100).

6. The ventilation system control method according to claim 1 or 5, characterized in that The air inlet of the blower (100) is directly communicated with the atmosphere.

7. The ventilation system control method according to claim 1, wherein, The ventilation system further includes a second air duct (500), and the air inlet of the fan (100) is communicated with the air outlet of the second air duct (500).

8. The ventilation system control method according to claim 7, wherein, The second pressure sensor (400) is disposed in the fan (100) and near the air inlet of the fan (100); Alternatively, the second pressure sensor (400) is disposed in the second air duct (500) and near the air outlet of the second air duct (500).

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