Variable frequency control method and device of alternating current variable frequency fan and variable frequency fan

Abstract

The present application relates to the technical field of variable frequency control, and particularly relates to a variable frequency control method and device of an alternating current variable frequency fan and the variable frequency fan, the method comprising: obtaining dangerous gas information inside a mine and a plurality of internal images inside the mine; determining at least one air leakage area inside the mine based on the plurality of internal images, so as to release detection gas in the air leakage area; obtaining detection gas concentration and detection gas flow corresponding to each air leakage area, and determining a corresponding air leakage amount of the mine according to the detection gas concentration and the detection gas flow corresponding to each air leakage area; determining a corresponding gas discharge amount of the mine based on a current gas content corresponding to each dangerous gas type and a corresponding early warning gas content; determining a target variable frequency frequency of the variable frequency fan based on the air leakage amount and the gas discharge amount; and controlling the variable frequency fan to work based on the target variable frequency frequency. The present application has the technical effect of improving the accuracy of variable frequency frequency determination.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of variable frequency fan control, in particular to a variable frequency control method and device of an alternating current variable frequency fan, a variable frequency fan and a computer readable storage medium. BACKGROUND

[0002] In mine production operations, workers need to enter the mine interior to perform corresponding work. As the production operation proceeds, various dangerous gases are generated. When the dangerous gases exceed the pre-warning content, the life safety of the workers inside the mine is also threatened. Therefore, the frequency of the variable frequency fan needs to be changed to increase air flow to expel the harmful gases.

[0003] After the types of dangerous gases exceed the pre-warning content, the variable frequency frequency of the variable frequency fan needs to be adjusted to expel the air inside the mine. Related technologies adjust the variable frequency according to the total content of all gases inside the mine to achieve air expulsion. However, air expulsion inside the mine only needs to reduce the content of harmful gases to a safe range. Adjusting the variable frequency according to the total content of all gases inside the mine increases the variable frequency. Therefore, the related technologies have low accuracy in determining the variable frequency. SUMMARY

[0004] To improve the accuracy of the variable frequency determination, the present application provides a variable frequency control method and device of an alternating current variable frequency fan, a variable frequency fan and a computer readable storage medium.

[0005] In a first aspect, the present application provides a variable frequency fan and a variable frequency control method thereof, which adopt the following technical solutions:

[0006] A variable frequency fan and a variable frequency control method thereof, comprising:

[0007] Obtain dangerous gas information inside the mine and a plurality of internal images inside the mine, wherein the dangerous gas information includes a plurality of dangerous gas types and their respective current gas contents, and the gas content corresponding to a dangerous gas type exceeds the pre-warning gas content threshold corresponding to the dangerous gas type;

[0008] Based on the plurality of internal images, determine at least one air leakage area inside the mine to release a detection gas in the air leakage area;

[0009] Obtain the detection gas concentration and the detection gas flow corresponding to each air leakage area, and determine the air leakage amount corresponding to the mine according to the detection gas concentration and the detection gas flow corresponding to each air leakage area;

[0010] Determine the gas expulsion amount corresponding to the mine based on the current gas content corresponding to each dangerous gas type and the corresponding pre-warning gas content;

[0011] determine a target variable frequency frequency of the variable frequency fan based on the air leakage amount and the gas exhaust amount;

[0012] control the variable frequency fan to work based on the target variable frequency frequency.

[0013] By using the above technical solutions, the dangerous gas information and the plurality of internal images inside the mine are obtained, the air leakage area inside the mine is determined based on the plurality of internal images, the detection gas concentration and the detection gas flow corresponding to each air leakage area are obtained after the detection gas is released in the air leakage area, and the air leakage amount of the mine is determined according to the detection gas concentration and the detection gas flow corresponding to all air leakage areas respectively. By using the detection gas to detect the air leakage amount of the air leakage area, since part of the gas content of the dangerous gas type will enter the air leakage area during the exhaust, the exhaust amount can be reduced during the exhaust by calculating the air leakage amount of the mine, so as to avoid that the exhaust amount is too large. In the case that the exhaust amount is too large, adjusting the variable frequency fan will cause the variable frequency frequency to increase, and the variable frequency frequency is inaccurate. By combining the air leakage amount and the gas exhaust amount, the accurate total gas exhaust amount inside the mine can be obtained, the target variable frequency frequency of the variable frequency fan is determined according to the total gas exhaust amount, and the variable frequency fan is controlled based on the target variable frequency frequency. Based on the accurate comprehensive gas exhaust amount, the accurate target variable frequency frequency can be obtained, and the variable frequency fan is controlled, so as to improve the accuracy of the variable frequency frequency determination.

[0014] In a possible implementation manner, the detection gas concentration and the detection gas flow corresponding to each air leakage area are obtained, and the air leakage amount corresponding to the mine is determined according to the detection gas concentration and the detection gas flow corresponding to all air leakage areas respectively, including:

[0015] For each air leakage area, the position information of the air leakage area is obtained, the first detection point and the second detection point are determined based on the position information of the air leakage area, and the first detection point and the second detection point are adjacent detection points of the air leakage area;

[0016] For each air leakage area, the detection gas flow and the detection gas concentration corresponding to the first detection point and the detection gas flow and the detection gas concentration corresponding to the second detection point are obtained at a preset time after the detection gas is released at the first detection point;

[0017] The air leakage amount corresponding to each air leakage area is determined based on the detection gas flow and the detection gas concentration corresponding to the first detection point and the detection gas flow and the detection gas concentration corresponding to the second detection point;

[0018] The air leakage amount inside the mine is determined based on the air leakage amount corresponding to all air leakage areas respectively.

[0019] By adopting the technical scheme, for each air leakage area, the position information of the air leakage area is acquired, the first detection point and the second detection point are determined according to the position information, and then for each air leakage area, when the detection gas moves, the detection gas flow and the detection gas concentration corresponding to each detection point are acquired, and then based on the air volume corresponding to all detection points, the air leakage amount corresponding to each air leakage area is determined, so as to determine the air leakage amount of the air leakage area according to the difference of the air volume of the detection points, and the air leakage amount of the air leakage area is determined based on the difference of the air volume of the detection points, which can effectively improve the accuracy of detection.

[0020] In a possible implementation, the internal image includes images corresponding to a plurality of mining devices respectively; and the determining of the at least one air leakage area in the mine interior based on the plurality of internal images comprises:

[0021] establishing a three-dimensional model of the mine interior environment according to the plurality of internal images;

[0022] inputting the three-dimensional model of the mine interior environment into an air leakage area detection model to determine the at least one air leakage area, wherein the air leakage area detection model is obtained by training a convolutional neural network based on a plurality of three-dimensional model training samples of mine interior environments.

[0023] By adopting the technical scheme, a three-dimensional model of the mine interior environment is established based on the internal image, so as to restore the mine interior environment, and then the three-dimensional model of the mine interior environment is input into the air leakage area detection model to determine the air leakage area, so as to accurately determine the air leakage area and improve the accuracy of determination of the air leakage area.

[0024] In a possible implementation, the determining of the gas discharge amount of the mine based on the current gas content and the warning gas content corresponding to each dangerous gas type comprises:

[0025] acquiring chemical property information of each dangerous gas type, and determining a danger level corresponding to each dangerous gas type based on the chemical property information and a gas content difference corresponding to each dangerous gas type, wherein the gas content difference is a difference between the current gas content and the warning gas content;

[0026] determining a target dangerous gas type from all dangerous gas types based on the danger level corresponding to each dangerous gas type;

[0027] determining the gas discharge amount of the mine based on the current gas content and the warning gas content corresponding to the target dangerous gas type.

[0028] By adopting the technical scheme, the type of the dangerous gas is determined based on the current gas content and the corresponding early warning gas content; the corresponding dangerous level of each type of dangerous gas is determined according to the chemical property information of each type of dangerous gas and the gas content difference, so as to accurately measure the danger of each type of dangerous gas; the target dangerous gas discharge type is determined based on the corresponding dangerous levels of all types of dangerous gas, so as to filter out the type of dangerous gas with the highest dangerous level, and the type of dangerous gas with the highest dangerous level is taken as the exhaust reference, and the type of dangerous gas with the highest dangerous level is discharged, which can maximize the safety of the mine interior.

[0029] In a possible implementation manner, before the determining of the at least one air leakage area in the mine interior based on the plurality of internal image information, the method further includes:

[0030] The plurality of internal image information is preprocessed, and the preprocessing manner includes binarization processing and de-meaning.

[0031] Correspondingly, the determining of the at least one air leakage area in the mine interior based on the image information includes:

[0032] The at least one air leakage area in the mine interior is determined based on the preprocessed image information and a preset air leakage area detection model.

[0033] By adopting the technical scheme, when the air leakage amount is determined based on the internal image and the air leakage area detection model, the image is processed, the internal image data amount is reduced by binarization processing of the internal image, and the calculation efficiency is improved; by de-meaning processing, the common part on the image is removed, the edge of the air leakage area is highlighted, the data workload is further reduced, and the data processing speed and the data processing efficiency are effectively improved.

[0034] In a possible implementation manner, after the controlling of the variable frequency fan to work based on the target variable frequency, the method further includes:

[0035] For the mine interior after the exhaust, the gas content corresponding to the target dangerous gas discharge type after the exhaust is acquired.

[0036] Based on the gas content after the exhaust and the early warning gas content corresponding to the target dangerous gas discharge type, it is determined whether the environment in the mine interior after the exhaust is in a safe state.

[0037] If not, the air leakage amount and the gas discharge amount are determined again and adjusted until the environment in the mine interior is in the safe state.

[0038] Otherwise, it is determined that the environment in the mine interior after the exhaust is in the safe state.

[0039] By adopting the technical scheme, the gas content corresponding to the target exhaust dangerous gas type identification after exhaust is obtained for the mine interior after exhaust, and whether the mine interior environment after exhaust is in a safe state is determined according to the gas content after exhaust and the early warning gas content, if yes, it indicates that the dangerous gas content has dropped below the early warning gas content, and normal production work can be carried out, otherwise, it indicates that the dangerous gas content is still relatively high, and needs to be exhausted again, so as to effectively ensure the personal safety of the mine interior personnel.

[0040] In a possible implementation, before the variable frequency fan is controlled to work based on the target variable frequency frequency, the method further includes:

[0041] generating a variable frequency reminder signal of the variable frequency fan to remind the mine interior personnel to move to a designated location;

[0042] obtaining an image of the designated location and mine interior personnel information after a preset time length;

[0043] determining whether all personnel in the mine interior have moved to the designated location based on the image of the designated location and the mine interior personnel information;

[0044] Correspondingly, the variable frequency fan is controlled to work based on the target variable frequency frequency, including:

[0045] if yes, the variable frequency fan is controlled to work based on the target variable frequency frequency.

[0046] By adopting the technical scheme, the variable frequency reminder signal of the variable frequency fan is generated to remind the mine interior personnel to move to the designated location in time, so as to ensure the safety of the mine interior personnel through personnel evacuation; then the image of the designated location and the mine interior personnel information after a preset time length are obtained to determine whether all personnel in the mine interior have moved to the designated location, if yes, it indicates that the mine interior personnel have completely evacuated, and the variable frequency fan can be controlled to work based on the target variable frequency frequency, otherwise, it indicates that the mine interior personnel have not completely evacuated, and thus it can be ensured that the exhaust is carried out under the condition that all personnel have evacuated, and the safety of the exhaust work is ensured.

[0047] In a second aspect, the application provides a variable frequency control device of an alternating current variable frequency fan, which adopts the following technical scheme:

[0048] The variable frequency control device of the alternating current variable frequency fan includes:

[0049] an acquisition module, configured to acquire dangerous gas information in a mine interior and a plurality of interior images in the mine interior, wherein the dangerous gas information includes a plurality of dangerous gas types and respective corresponding current gas contents;

[0050] The air leakage area determination module is configured to determine at least one air leakage area in the mine interior based on the plurality of internal images, so as to release the detection gas in the air leakage area;

[0051] The air leakage amount determination module is configured to obtain the detection gas concentration and the detection gas flow corresponding to each air leakage area, and determine the corresponding air leakage amount of the mine according to the detection gas concentration and the detection gas flow corresponding to each air leakage area;

[0052] The dangerous gas discharge information determination module is configured to determine the corresponding gas discharge amount of the mine based on the current gas content and the corresponding warning gas content corresponding to each dangerous gas type;

[0053] The target variable frequency frequency determination module is configured to determine the target variable frequency frequency of the variable frequency fan based on the air leakage amount and the gas discharge amount;

[0054] The variable frequency fan control module is configured to control the operation of the variable frequency fan based on the target variable frequency frequency.

[0055] In a third aspect, the present application provides a variable frequency fan, which adopts the following technical solution:

[0056] at least one processor;

[0057] a memory;

[0058] at least one application program, wherein the at least one application program is stored in the memory and is configured to be executed by the at least one processor, and the at least one application program is configured to execute the variable frequency control method of the alternating current variable frequency fan as described in any one of the first aspect.

[0059] In a fourth aspect, the present application provides a computer readable storage medium, which adopts the following technical solution:

[0060] The present application also provides a computer readable storage medium, which stores a computer program, and when the computer program is executed in a computer, the computer is caused to execute the variable frequency control method of the alternating current variable frequency fan as described in any one of the first aspect.

[0061] In summary, the present application includes at least one of the following beneficial technical effects:

[0062] The dangerous gas information and multiple internal images inside the mine are acquired, the air leakage area inside the mine is determined based on the multiple internal images, the detection gas concentration and the detection gas flow corresponding to each air leakage area are acquired after releasing the detection gas in the air leakage area, and the air leakage amount of the mine is determined according to the detection gas concentration and the detection gas flow corresponding to each air leakage area, so that the air leakage amount of the air leakage area is detected by using the detection gas, and since part of the gas content of the dangerous gas type will enter the air leakage area during exhaust, the air exhaust amount can be reduced during exhaust by calculating the air leakage amount of the mine, so as to avoid that the air exhaust amount is too large, and the frequency conversion fan frequency is increased when the frequency conversion fan is adjusted under the condition that the air exhaust amount is too large, and the frequency conversion fan frequency is inaccurate, and the accurate total gas exhaust amount inside the mine can be obtained by combining the air leakage amount and the gas exhaust amount, the target frequency conversion frequency of the frequency conversion fan is determined according to the total gas exhaust amount, and the frequency conversion fan is controlled based on the target frequency conversion frequency, the accuracy of the frequency conversion frequency can be improved by obtaining the accurate target frequency conversion frequency based on the accurate total gas exhaust amount, and then the frequency conversion fan is controlled. BRIEF DESCRIPTION OF DRAWINGS

[0063] The drawings constituting a part of the specification of the present application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0064] Figure 1 A flowchart of the frequency conversion control method of the alternating current frequency conversion fan provided for the embodiments of the present application is shown;

[0065] Figure 2 A SF6 detection gas movement schematic diagram provided for the embodiments of the present application is shown;

[0066] Figure 3 A structure schematic diagram of the frequency conversion control device of the alternating current frequency conversion fan provided for the embodiments of the present application is shown;

[0067] Figure 4 A structure schematic diagram of the frequency conversion fan provided for the embodiments of the present application is shown. DETAILED DESCRIPTION

[0068] The following Figures 1 to 4 The present application is further described in detail.

[0069] The present embodiments are only used to explain the present application, and are not used to limit the present application, and those skilled in the art can make non-creative contribution modifications to the present embodiments according to the needs after reading the present specification, but as long as the present application is within the scope of the present application, it is protected by the patent law.

[0070] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0071] In addition, the term "and / or" in the present application is only used to describe the association relationship of the associated objects, and can represent three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects unless otherwise specified.

[0072] The embodiments of the present application will be described in further detail below with reference to the drawings of the specification.

[0073] The embodiments of the present application provide a variable frequency control method of a variable frequency fan, which combines Figure 1 , Figure 1 A flowchart of a variable frequency control method of an alternating current variable frequency fan provided by the embodiments of the present application is shown in the figure, and the method comprises steps S101 to S106, wherein:

[0074] In step S101, dangerous gas information inside a mine and a plurality of internal images inside the mine are obtained, wherein the dangerous gas information comprises a plurality of dangerous gas types and respective corresponding current gas contents, and the gas content corresponding to the dangerous gas type exceeds the early warning gas content threshold corresponding to the dangerous gas type.

[0075] Specifically, the dangerous gas types inside the mine and the respective corresponding current gas contents can be monitored by corresponding gas sensors. In the embodiments of the present application, the dangerous gas types can be multiple types of CO, H2S, CH4, CO2, NO2, SO2, and NH3. The dangerous gas types represent the gas types that are harmful to the personnel inside the mine and exceed the early warning gas content threshold. A plurality of camera acquisition devices are arranged inside the mine, and the internal images acquired by each camera acquisition device can be obtained from different angles. It can be understood that based on the images captured by all the camera acquisition devices, the internal environment of the entire mine can be ensured. It can be understood that when the gas content corresponding to the dangerous gas type inside the mine exceeds the corresponding early warning content threshold, the personal safety of the personnel inside the mine is seriously threatened, and exhaust needs to be performed in a timely manner.

[0076] Specifically, a monitoring program is integrated in advance, and the monitoring program is used to monitor the triggering behavior of the frequency conversion control request, and once the monitoring program monitors that the frequency conversion control request is triggered, the dangerous gas information and the internal image inside the mine are acquired. Specifically, when the user determines the frequency conversion, a detection instruction is automatically generated, wherein the confirmation of the frequency conversion control can include: the user confirms the control by clicking the control button on the application, and the user confirms the control by voice, and when the user triggers the frequency conversion control request is detected, the dangerous gas information and the internal image inside the mine are acquired.

[0077] In step S102, at least one air leakage area inside the mine is determined based on a plurality of internal images, so as to release detection gas in the air leakage area.

[0078] Specifically, the at least one air leakage area can be determined according to an air leakage area detection model, and the air leakage area detection model can be used to accurately detect the air leakage area, and then the detection gas can be released in the air leakage area, wherein the detection gas can be used to detect the air leakage amount of the air leakage area. The air leakage amount is the total air amount that enters the inside of the mine but does not flow through the working place of the mine staff. In the embodiment of the present application, the air leakage place can be a goaf, a surface subsidence area or a crack of a non-tight ventilation structure. The air leakage amount inside the mine makes it necessary to use a larger fan frequency to complete the air volume inside the mine when the air is changed.

[0079] In step S103, the detection gas concentration and the detection gas flow corresponding to each air leakage area are acquired, and the air leakage amount of the mine is determined according to the detection gas concentration and the detection gas flow corresponding to each air leakage area.

[0080] By acquiring the detection gas concentration and the detection gas flow and performing calculation, the air leakage amount of each air leakage area can be obtained, and further, the sum of the air leakage amounts of all air leakage areas can be obtained. Since part of the gas content of the dangerous gas species will enter the air leakage area when the air is exhausted, the air exhaust amount can be reduced by calculating the air leakage amount of the mine, so as to avoid that the air exhaust amount is too large. In the case that the air exhaust amount is too large, adjusting the variable frequency fan will cause the variable frequency to increase, and the variable frequency is not accurate. However, by combining the air leakage amount and the gas exhaust amount, the total gas exhaust amount inside the mine can be accurately obtained.

[0081] In step S104, the gas exhaust amount of the mine is determined based on the current gas content and the corresponding warning gas content of each dangerous gas species.

[0082] The gas inside the mine is mixed gas, and with the entry of new air, the gas content of the dangerous gas species inside the mine will also decrease, and at the same time, the content of other gases inside the mine will also decrease to the safe gas content range.

[0083] Specifically, the gas discharge amount of the mine can be determined according to the gas content difference, or the gas discharge amount can be determined according to the respective dangerous levels of the dangerous gas types.

[0084] Thus, the implementation manner of determining the gas content of the mine based on the gas content difference can specifically include: for each dangerous gas type, determining the gas content difference corresponding to each dangerous gas type based on the current gas content and the early warning gas content corresponding to each dangerous gas type, wherein the gas content difference = current gas content - early warning gas content, determining the dangerous gas type with the highest gas content difference based on the respective gas content differences of all dangerous gas types, and taking the gas content difference as the gas discharge amount of the mine. The gas discharge amount is determined based on the dangerous gas type with the highest content, and when exhausting, the content of other gases can also be reduced to fully ensure the safety of the internal environment of the mine.

[0085] The implementation manner of determining the gas discharge amount based on the respective dangerous levels of the dangerous gas types can specifically include: obtaining the chemical property information of each dangerous gas type, and determining the respective dangerous levels of all dangerous gas types based on the respective chemical property information and the respective gas content differences of all dangerous gas types, wherein the gas content difference is the difference between the current gas content and the early warning gas content; determining the target dangerous gas type from all dangerous gas types based on the respective dangerous levels of all dangerous gas types; and determining the gas discharge amount of the mine based on the current gas content and the corresponding early warning gas content of the target dangerous gas type, which further effectively improves the safety of the internal environment of the mine.

[0086] In step S105, the target variable frequency frequency of the variable frequency fan is determined based on the air leakage amount and the gas discharge amount.

[0087] The total air exchange amount can be determined based on the air leakage amount and the gas discharge amount, and the total air exchange amount = gas discharge amount - air leakage amount; the target variable frequency frequency corresponding to the total air exchange amount can be determined based on the preset correspondence between the total air exchange amount and the variable frequency frequency and the total air exchange amount. It can be understood that part of the gas of the dangerous gas type will enter the air leakage area during exhaust, and therefore the air leakage amount needs to be subtracted in the total air exchange amount calculation formula. The preset correspondence between the total air exchange amount and the variable frequency frequency is obtained based on a plurality of historical total air exchange amounts and historical target variable frequency frequencies, and the process of obtaining the preset correspondence between the total air exchange amount and the variable frequency frequency based on a plurality of historical total air exchange amounts and historical target variable frequency frequencies includes: for a preset total air exchange amount, obtaining all variable frequency frequencies corresponding to the preset total air exchange amount, determining the variable frequency frequency with the highest usage frequency as the variable frequency frequency corresponding to the preset total air exchange amount based on all variable frequency frequencies, and further obtaining the respective variable frequency frequencies of all total air exchange amounts.

[0088] Step S106, controlling the variable frequency fan to work based on the target variable frequency.

[0089] Specifically, after determining the target variable frequency, a target variable frequency signal is generated. The target variable frequency signal can be transmitted to the frequency converter, and the frequency converter controls the variable frequency fan to work based on the target variable frequency signal. Alternatively, the target variable frequency signal can be transmitted to the mobile terminal of the worker, and the worker adjusts the output frequency of the frequency converter according to the target variable frequency to control the variable frequency fan to work.

[0090] Based on the above embodiment, the dangerous gas information and the plurality of internal images inside the mine are obtained, the air leakage area inside the mine is determined based on the plurality of internal images, the detection gas concentration and the detection gas flow corresponding to each air leakage area are obtained after the detection gas is released in the air leakage area, and the air leakage amount of the mine is determined according to the detection gas concentration and the detection gas flow corresponding to each air leakage area. By using the detection gas to detect the air leakage amount of the air leakage area, the air leakage amount of the mine is calculated, and the air exhaust amount is reduced during air exhaust, so as to avoid that the air exhaust amount is too large. Adjusting the variable frequency fan in the case that the air exhaust amount is too large will cause the variable frequency to increase, and the variable frequency is inaccurate. By combining the air leakage amount and the gas exhaust amount, the accurate total gas exhaust amount inside the mine is obtained, the target variable frequency of the variable frequency fan is determined according to the total gas exhaust amount, and the variable frequency fan is controlled to work based on the target variable frequency. Based on the accurate comprehensive gas exhaust amount, the accurate target variable frequency can be obtained, and the variable frequency fan is controlled, so as to improve the accuracy of the variable frequency determination.

[0091] Further, in the embodiment of the present application, based on obtaining the detection gas concentration and the detection gas flow corresponding to each air leakage area, and determining the corresponding air leakage amount of the mine according to the detection gas concentration and the detection gas flow corresponding to each air leakage area, the steps SA1 to SA4 are included, wherein:

[0092] Step SA1, for each air leakage area, obtaining position information of the air leakage area, determining a first detection point and a second detection point based on the position information of the air leakage area, and the first detection point and the second detection point are adjacent detection points of the air leakage area.

[0093] When the air leakage area is determined, the internal image where the air leakage area is located is obtained, and the sub-area where the air leakage area is located is determined according to the internal image where the air leakage area is located. The sub-area is obtained by dividing the internal part of the mine into multiple areas. As the mine is mined, the number of sub-areas and the internal images corresponding to the sub-areas are updated. The position of each sub-area in the internal part of the mine is stored by the technician. A plurality of detection points are arranged in each sub-area, and the position of each detection point is also pre-set. When the air leakage area is determined, the sub-area where the air leakage area is located is obtained, and the position of the air leakage area can be determined based on the position of the sub-area in the internal part of the mine. Then, the first detection point and the second detection point are determined according to the position information of the air leakage area. It can be understood that the first detection point is located at the upwind position of the air leakage area, and the second detection point is located at the downwind position of the air leakage area.

[0094] In step SA2, for each air leakage area, the detection gas flow and the detection gas concentration corresponding to the first detection point, and the detection gas flow and the detection gas concentration corresponding to the second detection point are obtained at a preset time after the detection gas is released at the first detection point.

[0095] When the air leakage area is determined, the detection gas device is controlled to release the detection gas, and the detection gas moves from the first detection point to the second detection point. In the process of moving, the detection gas passes through the air leakage area. Therefore, the detection gas flow and the detection gas concentration corresponding to the first detection point are different from the detection gas flow and the detection gas concentration corresponding to the second detection point. The detection gas flow and the detection gas concentration corresponding to each detection point are detected by the corresponding sensor and uploaded to the electronic device.

[0096] In the embodiments of the present application, preferably, the detection gas is SF6. The SF6 detection gas is an artificially synthesized gas. Pure SF6 gas has high stability at normal temperature and pressure. The SF6 detection gas is a colorless, odorless, tasteless, odorless, non-toxic and non-combustible gas with excellent insulation performance and is not easy to diffuse and dilute. Using SF6 gas as the detection gas can effectively improve the accuracy of air leakage detection. Specifically, refer to Figure 2 As Figure 2As shown, point A in the figure is any air leakage area inside the mine, based on the air leakage area, the first detection point B1 and the second detection point B2 located adjacent to the air leakage area can be determined, and the SF6 detection gas is released from the gas storage device, and in the detection process, a continuous, stable and quantitative release of SF6 detection gas is required, and the SF6 detection gas moves from the first detection point B1 to the second detection point B2 along the airflow, and as the SF6 detection gas moves, the concentration of the SF6 detection gas will continue to decrease, and thus the air leakage amount corresponding to the air leakage area can be obtained. The setting position of the SF6 detection gas storage device is not limited in the embodiments of the present application, and the user can set it by himself, and it can be understood that in order to ensure the detection efficiency, at least one SF6 detection gas storage device should be provided for every two adjacent detection points.

[0097] Step SA3, based on the detection gas flow and the detection gas concentration corresponding to the first detection point, and the detection gas flow and the detection gas concentration corresponding to the second detection point, the air leakage amount corresponding to each air leakage area is determined.

[0098] Step SA4, based on the air leakage amount corresponding to each air leakage area, the air leakage amount inside the mine is determined.

[0099] The air volume Q corresponding to each detection point can be obtained according to the air volume calculation formula, Wherein, q is the gas release amount of the detection gas, C is the gas concentration of the detection gas, and further, the air leakage amount of each air leakage area can be determined according to the air volume difference of the detection point, wherein, ΔQ=Q1-Q2, wherein q1 is the release amount of the detection gas of the first detection point, q2 is the release amount of the detection gas of the second detection point, C1 is the concentration of the detection gas of the first detection point, and C2 is the concentration of the detection gas of the second detection point. According to the air leakage amount corresponding to each air leakage area, the air leakage amount is calculated, and the air leakage amount inside the mine is determined, the air volume of the first detection point is Q1, and the air volume of the second detection point is Q2.

[0100] Based on the above embodiments, based on a plurality of internal images, at least one air leakage area is determined, for each air leakage area, the position information of the air leakage area is obtained, and the first detection point and the second detection point are determined according to the position information, so as to determine the moving direction and the moving path of the detection gas; for each air leakage area, when the detection gas moves, the detection gas flow and the detection gas concentration corresponding to each detection point are obtained, and then based on the air volume corresponding to all detection points, the air leakage amount corresponding to each air leakage area is determined, so as to determine the air leakage amount of the air leakage area according to the difference of the air volume of the detection point.

[0101] Further, in the embodiments of the present application, based on a plurality of internal images, at least one air leakage area is determined, including steps SB1 to SB2, wherein:

[0102] Step SB1, a three-dimensional model of the mine internal environment is established according to a plurality of internal images.

[0103] Specifically, the plurality of internal images can be input into a three-dimensional real scene modeling software for three-dimensional modeling. It can be understood that the plurality of internal images are all images of the mine internal environment, and thus the three-dimensional model of the mine internal environment can be established.

[0104] Step SB2, the three-dimensional model of the mine internal environment is input into a air leakage area detection model to determine at least one air leakage area, wherein the air leakage area detection model is trained based on a plurality of three-dimensional model training samples of the mine internal environment.

[0105] Specifically, the three-dimensional model of the mine internal environment is input into the air leakage area detection model, and the air leakage area detection model can calibrate the air leakage area in the three-dimensional model. The training process of the air leakage area detection model includes: obtaining a plurality of three-dimensional model training samples and an actual air leakage area corresponding to each training sample, inputting the plurality of three-dimensional model training samples into the air leakage area detection model to obtain a training air leakage area corresponding to each three-dimensional model training sample, using a preset loss function to determine a loss value for all training air leakage areas and the respective corresponding actual air leakage areas, and iteratively training the to-be-trained air leakage area detection model according to the loss value and each three-dimensional model training sample, until the loss value reaches a preset loss threshold, and determining the to-be-trained air leakage area detection model that reaches the preset loss threshold as the air leakage area detection model. The preset loss function and the preset loss threshold are not limited in the embodiments of the present application.

[0106] Based on the above embodiments, the three-dimensional model of the mine internal environment is established based on the internal images to restore the mine internal environment, and then the three-dimensional model of the mine internal environment is input into the air leakage area detection model to determine the air leakage area, so as to accurately determine the air leakage area and improve the accuracy of the air leakage area determination.

[0107] Further, in the embodiments of the present application, the gas discharge amount of the mine corresponding to each dangerous gas species is determined based on the current gas content corresponding to each dangerous gas species and the corresponding warning gas content, including steps SC1 to SC3, wherein:

[0108] Step SC1, obtain the chemical property information of each dangerous gas species, and determine the danger level corresponding to each dangerous gas species based on the chemical property information corresponding to each dangerous gas species and the gas content difference value corresponding to each dangerous gas species, wherein the gas content difference value is the difference between the current gas content and the warning gas content.

[0109] The chemical property information of each dangerous gas type is pre-stored, and the chemical property information of each dangerous gas type can include the ignition point of the gas, the volatility level of the gas, and the toxicity level of the gas, wherein the gas volatility level and the toxicity level of each dangerous gas type are pre-stored. Based on the respective corresponding gas content difference and the corresponding relationship between the difference and the concentration level, the respective corresponding concentration level of each dangerous gas type is determined, and the respective corresponding ignition point level is determined according to the ignition point of each dangerous gas type. It can be understood that the lower the ignition point of the dangerous gas type, the higher the ignition point level. Further, according to the ignition point level, the concentration level, the volatility level, and the toxicity level of the gas, the average level corresponding to each dangerous gas type is determined, and the average level corresponding to each dangerous gas type is determined as the corresponding dangerous level. It can be understood that the average level corresponding to each dangerous gas type is different.

[0110] Step SC2, based on the respective corresponding dangerous level of all dangerous gas types, determining the target dangerous gas type from all dangerous gas types.

[0111] Step SC3, based on the current gas content corresponding to the target dangerous gas type and the corresponding early warning gas content, determining the gas discharge amount corresponding to the mine.

[0112] Comparing the respective corresponding dangerous level of all dangerous gas types, the corresponding dangerous gas type with the highest dangerous level is determined as the target dangerous gas type. Further, based on the difference between the current gas content and the early warning gas content corresponding to the target dangerous gas type, the gas discharge amount corresponding to the mine is determined.

[0113] Based on the above embodiment, the dangerous gas type is determined based on the current gas content and the corresponding early warning gas content; then the respective corresponding dangerous level is determined according to the chemical property information of each dangerous gas type and the gas content difference, so as to accurately measure the danger of each dangerous gas type; based on the respective corresponding dangerous level of all dangerous gas types, the target dangerous gas discharge type is determined, so as to screen out the dangerous gas type with the highest dangerous level, and the dangerous gas discharge with the highest dangerous level is taken as the exhaust standard, which can maximize the safety of the mine interior.

[0114] Further, in the embodiment of the present application, before determining the at least one air leakage area inside the mine based on the internal image, the internal image is pre-processed, wherein the pre-processing method includes binaryzation processing and de-meaning.

[0115] Correspondingly, based on the internal image, the at least one air leakage area inside the mine is determined, including:

[0116] Based on the pre-processed internal image and the preset air leakage area detection model, at least one air leakage area in the mine interior is determined.

[0117] Specifically, the internal image is converted to grayscale, the R, G and B channels of each pixel are taken out, and then mapped to the grayscale space to convert the internal image to a black and white image. The internal image converted to a black and white image is de-meaned to remove the common part in the internal image to highlight the edge features of the air leakage area. Further, the air leakage amount is detected according to the pre-processed internal image and the preset air leakage area detection model, which can effectively improve the detection efficiency.

[0118] Based on the above embodiments, when the air leakage amount is determined based on the internal image and the air leakage area detection model, the image is processed, the internal image is binarized to reduce the internal image data amount and improve the calculation efficiency; the common part on the image is removed through de-meaning processing to highlight the edge of the air leakage area, further reducing the data calculation workload and effectively improving the work efficiency.

[0119] Further, in the embodiments of the present application, after the variable frequency fan is controlled to work based on the target variable frequency, steps SD1 to SD4 are further included, wherein:

[0120] Step SD1, for the mine interior after exhaust, the gas content corresponding to the target dangerous gas exhaust type is obtained.

[0121] Specifically, for the mine interior after completing the air exchange work, the data uploaded by the sensor corresponding to the target dangerous gas exhaust type is obtained, and then the content of the target excluded dangerous gas type in the mine interior after completing the air exchange work can be determined.

[0122] Step SD2, based on the gas content after exhaust and the pre-warning gas content corresponding to the target dangerous gas exhaust type, it is determined whether the mine interior environment after exhaust is in a safe state.

[0123] Step SD3, if not, the air leakage amount and the gas exhaust amount are determined again and adjusted.

[0124] Step SD4, otherwise, it is determined that the mine interior environment after exhaust is in a safe state.

[0125] Specifically, the gas content after the exhaust is compared with the pre-warning gas content corresponding to the target dangerous gas discharge type to determine whether the mine internal environment after the exhaust is in a safe state. If not, it indicates that the gas content after the exhaust of the target dangerous gas discharge type in the mine internal is still in a high content state, and in this case, the mining production activities continue to be carried out, which has a high risk, and thus step SD3 needs to be performed to determine the air leakage and the gas discharge amount again, to determine the target variable frequency frequency again, and to adjust the variable frequency fan; otherwise, it indicates that the gas content after the exhaust is less than the pre-warning gas content corresponding to the target dangerous gas discharge type, and the mine internal environment is in a safe state, and normal mining production activities can be carried out.

[0126] Based on the above embodiment, for the mine internal after the exhaust, the gas content after the exhaust corresponding to the target dangerous gas discharge type is obtained, and whether the mine internal environment after the exhaust is a safe state is determined according to the gas content after the exhaust and the pre-warning gas content, to ensure that the content of the target dangerous gas discharge type is in a safe state, and to provide a safe production environment for the staff in the mine internal.

[0127] Further, in the embodiment of the present application, before the variable frequency fan is controlled to work based on the target variable frequency frequency, the method further includes:

[0128] generating a variable frequency alarm signal of the variable frequency fan to remind the personnel in the mine internal to move to a designated location.

[0129] Specifically, before the target variable frequency fan is controlled to work, the variable frequency alarm signal is generated, which can be in the form of voice prompt or continuous beeping sound, to remind the personnel in the mine internal that the mine internal needs to be ventilated, and all the personnel in the mine internal need to evacuate to a designated location. The number of the designated locations can be one or multiple, and the designated location can be any point in the mine internal. The number of the designated locations and the specific location of the designated location are not limited in the embodiment of the present application, and can be set by the user.

[0130] acquiring an image of the designated location and personnel information in the mine internal after a preset time length.

[0131] Specifically, when the number of the designated locations is one, the corresponding image is acquired, and when the number of the designated locations is multiple, the corresponding images of all the designated locations are acquired. The image of the designated location is collected by the camera collection device.

[0132] Based on the image of the designated location and the personnel information in the mine internal, it is determined whether all the personnel in the mine internal move to the designated location.

[0133] Correspondingly, the variable frequency fan is controlled to work based on the target variable frequency frequency, including:

[0134] If yes, the variable frequency fan is controlled to work based on the target variable frequency.

[0135] The personnel in the acquired image of the specified location are subjected to face recognition, and the recognized area is matched with the face information in the face information library to determine whether all personnel inside the mine have moved to the specified location, wherein the face information library is pre-stored. When it is determined that all personnel inside the mine have moved to the specified location, the variable frequency fan can be controlled based on the target variable frequency, otherwise, it indicates that there are still workers in the working area inside the mine, and the variable frequency alarm signal needs to be issued again to remind the corresponding workers to evacuate in time.

[0136] The variable frequency reminder signal of the variable frequency fan is generated to remind the personnel inside the mine to move to the specified location in time, so as to ensure the safety of the personnel inside the mine; the image of the specified location and the information of the personnel inside the mine after a preset time length are acquired, and it is determined whether all personnel inside the mine have moved to the specified location, if yes, the variable frequency fan is controlled to work based on the target variable frequency, so as to ensure that the exhaust is performed under the condition that all personnel have evacuated, and the safety of the exhaust work is ensured.

[0137] Further, in the embodiment of the present application, the target variable frequency of the variable frequency fan based on the air leakage and the gas exhaust amount can be calculated based on the ventilation air volume control algorithm and the fluid mechanics principle. The calculation formula can be Wherein, the air volume of the first detection point is Q1, the air volume of the second detection point is Q2, the fan shaft power of the first detection point is P1, the fan shaft power of the second detection point is P2, the speed of the first detection point is n1, and the speed of the second detection point is n2. The conversion relationship between the fan shaft power and the air volume is obtained, wherein the shaft power is obtained by monitoring the power sensor, the output air volume of the fan can be controlled, and the exhaust of the gas inside the mine is realized.

[0138] The above embodiment introduces the variable frequency control method of the alternating current variable frequency fan from the perspective of method flow, and the following embodiment introduces the variable frequency control device of the alternating current variable frequency fan from the perspective of virtual module or virtual unit, which will be described in detail in the following embodiment.

[0139] The embodiment of the present application provides a variable frequency control device of an alternating current variable frequency fan, as shown in the figure, the variable frequency control device of the alternating current variable frequency fan can specifically include: Figure 3

[0140] The acquisition module 210 is configured to acquire the dangerous gas information inside the mine and a plurality of internal images inside the mine, wherein the dangerous gas information includes a plurality of dangerous gas types and their corresponding current gas contents, and the gas content corresponding to the dangerous gas type exceeds the warning gas content threshold corresponding to the dangerous gas type. ​

[0141] The air leakage area determination module 220 is configured to determine at least one air leakage area in the mine interior based on the plurality of interior images, so as to release the detection gas in the air leakage area.

[0142] The air leakage amount determination module 230 is configured to obtain the detection gas concentration and the detection gas flow corresponding to each air leakage area, and determine the air leakage amount of the mine according to the detection gas concentration and the detection gas flow corresponding to each air leakage area.

[0143] The dangerous gas discharge information determination module 240 is configured to determine the gas discharge amount of the mine based on the current gas content and the warning gas content corresponding to each dangerous gas type.

[0144] The target variable frequency frequency determination module 250 is configured to determine the target variable frequency frequency of the variable frequency fan based on the air leakage amount and the gas discharge amount.

[0145] The variable frequency fan control module 260 is configured to control the variable frequency fan to work based on the target variable frequency frequency.

[0146] For the embodiment of the present application, the obtaining module 210 obtains the dangerous gas information and the plurality of interior images in the mine interior, the air leakage area determination module 220 determines the air leakage area in the mine interior based on the plurality of interior images, so as to release the detection gas in the air leakage area; the air leakage amount determination module 230 obtains the detection gas concentration and the detection gas flow corresponding to each air leakage area, so as to detect the air leakage amount of the air leakage area by using the detection gas, and then determine the air leakage amount of the mine according to the detection gas concentration and the detection gas flow corresponding to each air leakage area; since part of the gas content of the dangerous gas type will enter the air leakage area during the exhaust, the exhaust amount can be reduced during the exhaust by calculating the air leakage amount of the mine, so as to avoid that the exhaust amount is too large; under the condition that the exhaust amount is too large, adjusting the variable frequency fan will cause the variable frequency frequency to increase, and the variable frequency frequency is inaccurate; however, the accurate total gas discharge amount in the mine interior can be obtained by combining the air leakage amount and the gas discharge amount, the target variable frequency frequency determination module 250 determines the target variable frequency frequency of the variable frequency fan according to the total gas discharge amount, and the variable frequency fan control module 260 controls the variable frequency fan to work based on the target variable frequency frequency; based on the accurate comprehensive gas discharge amount, the accurate target variable frequency frequency can be obtained, and then the variable frequency fan is controlled, so as to improve the accuracy of the variable frequency frequency determination.

[0147] In a possible implementation manner of the embodiment of the present application, when the air leakage amount determination module 230 performs the operation of obtaining the detection gas concentration and the detection gas flow corresponding to each air leakage area, and determining the air leakage amount of the mine according to the detection gas concentration and the detection gas flow corresponding to each air leakage area, the air leakage amount determination module 230 is configured to:

[0148] For each air leakage area, obtain position information of the air leakage area, and determine a first detection point and a second detection point based on the position information of the air leakage area, the first detection point and the second detection point being detection points adjacent to the air leakage area;

[0149] For each air leakage area, obtain the detection gas flow and the detection gas concentration corresponding to the first detection point and the detection gas flow and the detection gas concentration corresponding to the second detection point at a preset time after the detection gas is released at the first detection point;

[0150] Determine the air leakage amount corresponding to each air leakage area based on the detection gas flow and the detection gas concentration corresponding to the first detection point and the detection gas flow and the detection gas concentration corresponding to the second detection point;

[0151] Determine the air leakage amount inside the mine based on the air leakage amounts corresponding to all air leakage areas.

[0152] In one possible implementation of the embodiments, when determining at least one air leakage area inside the mine based on the plurality of internal images, the air leakage area determination module 220 is configured to:

[0153] Establish a three-dimensional model of the internal environment of the mine according to the plurality of internal images;

[0154] Input the three-dimensional model of the internal environment of the mine into an air leakage area detection model to determine at least one air leakage area, wherein the air leakage area detection model is obtained by training a convolutional neural network based on a plurality of three-dimensional model training samples of the internal environment of the mine.

[0155] In one possible implementation of the embodiments, when determining the gas discharge amount of the mine based on the current gas content and the warning gas content corresponding to each dangerous gas type, the dangerous gas discharge information determination module 240 is configured to:

[0156] Obtain chemical property information of each dangerous gas type, and determine a danger level corresponding to each dangerous gas type based on the chemical property information corresponding to each dangerous gas type and a gas content difference value corresponding to each dangerous gas type, wherein the gas content difference value is a difference between the current gas content and the warning gas content;

[0157] Determine a target dangerous gas type from all dangerous gas types based on the danger levels corresponding to all dangerous gas types;

[0158] Determine the gas discharge amount of the mine based on the current gas content and the warning gas content corresponding to the target dangerous gas type.

[0159] In one possible implementation of the embodiments, the variable frequency control device of the AC variable frequency fan further comprises:

[0160] an image preprocessing module, configured to:

[0161] preprocess the plurality of internal images, wherein the preprocessing manner comprises binarization processing and de-meaning;

[0162] Correspondingly, the air leakage area determination module 220, when determining the at least one air leakage area in the mine interior based on the plurality of internal images, is configured to:

[0163] determine the at least one air leakage area in the mine interior based on the plurality of preprocessed internal images.

[0164] In a possible implementation of the embodiment of the present application, the variable frequency control device of the AC variable frequency fan further comprises:

[0165] a safety state determination module, configured to:

[0166] for the mine interior after the exhaust, acquire the exhaust gas content corresponding to the exhaust type of the target dangerous gas;

[0167] based on the exhaust gas content and the pre-warning gas content corresponding to the exhaust type of the target dangerous gas, determine whether the mine interior environment after the exhaust is in a safe state;

[0168] if yes, then determine the air leakage amount and the gas exhaust amount again and adjust them;

[0169] otherwise, determine that the mine interior environment after the exhaust is in a safe state.

[0170] In a possible implementation of the embodiment of the present application, the variable frequency control device of the AC variable frequency fan further comprises:

[0171] a variable frequency fan alarm signal generation module, configured to:

[0172] generate a variable frequency alarm signal of the variable frequency fan to remind the personnel in the mine interior to move to the designated location;

[0173] acquire the image of the designated location and the personnel information in the mine interior after a preset time length;

[0174] based on the image of the designated location and the personnel information in the mine interior, determine whether all the personnel in the mine interior have moved to the designated location;

[0175] Correspondingly, the variable frequency fan control module 260, when controlling the variable frequency fan to work based on the target variable frequency, is configured to:

[0176] if yes, then control the variable frequency fan to work based on the target variable frequency.

[0177] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the frequency conversion control device of the variable frequency fan described above can refer to the corresponding process in the foregoing method embodiments, and will not be described here.

[0178] A variable frequency fan is provided in the embodiments of the present application, as shown in Figure 4 Figure 4 The variable frequency fan 300 shown in the figure comprises a processor 301 and a memory 303. The processor 301 and the memory 303 are connected, for example, through a bus 302. Optionally, the variable frequency fan 300 can further comprise a transceiver 304. It should be noted that the transceiver 304 is not limited to one in actual application, and the structure of the variable frequency fan 300 does not constitute a limitation on the embodiments of the present application.

[0179] The processor 301 can be a CPU (Central Processing Unit, central processor), a general-purpose processor, a DSP (Digital Signal Processor, data signal processor), an ASIC (Application Specific Integrated Circuit, application-specific integrated circuit), an FPGA (Field Programmable Gate Array, field programmable gate array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in combination with the disclosure content of the present application. The processor 301 can also be a combination of computing functions, such as one or more microprocessor combinations, combinations of DSP and microprocessor, etc.

[0180] The bus 302 can comprise a path for transmitting information between the above-mentioned components. The bus 302 can be a PCI (Peripheral Component Interconnect, peripheral component interconnect) bus or an EISA (Extended Industry Standard Architecture, extended industry standard architecture) bus, etc. The bus 302 can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 4 In the figure, only one thick line is used to represent the bus, but it does not mean that there is only one bus or one type of bus.

[0181] ​The memory 303 can be a ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, a RAM (Random Access Memory) or other type of dynamic storage device that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read-Only Memory), a CD-ROM (Compact Disc Read-Only Memory) or other optical disk storage, a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

[0182] The memory 303 is configured to store application program codes for implementing the solutions of the present application, and the processor 301 is configured to control the execution of the application program codes. The processor 301 is configured to execute the application program codes stored in the memory 303 to implement the content shown in the foregoing method embodiments.

[0183] Figure 4 The frequency conversion fan shown is only an example, and should not impose any limitation on the functions and use range of the embodiments of the present application.

[0184] The embodiments of the present application provide a computer readable storage medium, and the computer readable storage medium stores computer programs, and when the computer programs run on a computer, the computer can execute the corresponding content in the foregoing method embodiments. Compared with the related art, the dangerous gas information and the plurality of internal images in the mine are obtained, the air leakage area in the mine is determined based on the plurality of internal images, the detection gas concentration and the detection gas flow corresponding to each air leakage area are obtained after the detection gas is released in the air leakage area, and the air leakage amount of the mine is determined according to the detection gas concentration and the detection gas flow corresponding to each air leakage area, so as to detect the air leakage amount of the air leakage area by using the detection gas, and because part of the gas content of the dangerous gas type will enter the air leakage area during exhaust, the air leakage amount of the mine is calculated, so as to reduce the exhaust amount during exhaust, to avoid that the air leakage amount is too large, and to adjust the frequency conversion fan to cause the frequency conversion frequency to increase, which is inaccurate. The accurate total gas exhaust amount in the mine is obtained by combining the air leakage amount and the gas exhaust amount, the target frequency conversion frequency of the frequency conversion fan is determined according to the total gas exhaust amount, and the frequency conversion fan is controlled based on the target frequency conversion frequency. The accurate target frequency conversion frequency is obtained based on the accurate comprehensive gas exhaust amount, the frequency conversion fan is controlled, and then the accuracy of the frequency conversion frequency is improved.

[0185] It should be understood that although the steps in the flowcharts of the accompanying drawings are shown in a sequential order following the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated otherwise herein, the execution of the steps is not necessarily limited to the order shown in the flowcharts, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts of the accompanying drawings can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of which is not necessarily sequential, but can be round-robin or alternating with at least some of the other steps or sub-steps or stages of other steps.

[0186] The above only describes some embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A variable frequency control method of an alternating current variable frequency blower, characterized by, The method comprises the following steps: obtaining dangerous gas information inside the mine and a plurality of internal images inside the mine, wherein the dangerous gas information comprises a plurality of dangerous gas types and respective corresponding current gas contents, and the gas content corresponding to the dangerous gas type exceeds the early warning gas content threshold corresponding to the dangerous gas type; based on the plurality of internal images, determining at least one air leakage area inside the mine to facilitate the release of detection gas in the air leakage area; obtaining the detection gas concentration and the detection gas flow corresponding to each air leakage area, and determining the air leakage amount of the mine according to the detection gas concentration and the detection gas flow corresponding to all air leakage areas respectively; based on the current gas content corresponding to each dangerous gas type and the corresponding early warning gas content, determining the gas discharge amount corresponding to the mine; based on the air leakage amount and the gas discharge amount, determining the target variable frequency frequency of the variable frequency fan; based on the target variable frequency frequency, controlling the operation of the variable frequency fan, determining the target variable frequency frequency of the variable frequency fan based on the air leakage amount and the gas discharge amount, comprising: calculating the difference between the gas discharge amount and the air leakage amount to obtain the total air exchange amount; based on the corresponding relationship between the preset total air exchange amount and the variable frequency frequency and the total air exchange amount, determining the target variable frequency frequency corresponding to the total air exchange amount, wherein the corresponding relationship between the preset total air exchange amount and the variable frequency frequency is obtained based on a plurality of historical total air exchange amounts and historical target variable frequency frequencies, and the process based on a plurality of historical total air exchange amounts and historical target variable frequency frequencies comprises: for the preset total air exchange amount, obtaining all variable frequency frequencies corresponding to the preset total air exchange amount, based on all the variable frequency frequencies, determining the variable frequency frequency with the highest usage frequency as the variable frequency frequency corresponding to the preset total air exchange amount, to obtain the variable frequency frequency corresponding to all preset total air exchange amounts.

2. The variable frequency control method of an AC variable frequency fan according to claim 1, characterized in that, The method comprises the following steps: for each air leakage area, obtaining the position information of the air leakage area, and based on the position information of the air leakage area, determining a first detection point and a second detection point adjacent to the air leakage area; for each air leakage area, at a preset time after the release of the detection gas at the first detection point, obtaining the detection gas flow and the detection gas concentration corresponding to the first detection point, and the detection gas flow and the detection gas concentration corresponding to the second detection point; based on the detection gas flow and the detection gas concentration corresponding to the first detection point, and the detection gas flow and the detection gas concentration corresponding to the second detection point, determining the air leakage amount corresponding to each air leakage area; based on the air leakage amount corresponding to all air leakage areas, determining the air leakage amount inside the mine.

3. The variable frequency control method of an AC variable frequency fan according to claim 1, wherein The method comprises the following steps: based on the plurality of internal images, determining at least one air leakage area inside the mine, comprising: establishing a three-dimensional model of the internal environment of the mine according to the plurality of internal images; input the three-dimensional model of the mine internal environment to the air leakage area detection model to determine at least one air leakage area, wherein the air leakage area detection model is obtained by training a convolutional neural network based on a plurality of three-dimensional model training samples of mine internal environments.

4. The variable frequency control method of an AC variable frequency fan according to claim 1, wherein The determination of the gas discharge amount of the mine based on the current gas content and the corresponding early warning gas content of each dangerous gas type includes: Obtain the chemical property information of each dangerous gas type, and determine the respective dangerous levels of all dangerous gas types based on the respective chemical property information and the respective gas content difference of each dangerous gas type, wherein the gas content difference is the difference between the current gas content and the early warning gas content; Determine the target dangerous gas type from all dangerous gas types based on the respective dangerous levels of all dangerous gas types; Determine the gas discharge amount of the mine based on the current gas content and the corresponding early warning gas content of the target dangerous gas type.

5. The variable frequency control method of an AC variable frequency fan according to claim 1, wherein Before determining the at least one air leakage area inside the mine based on the plurality of internal images, the method further includes: Preprocessing the plurality of internal images, wherein the preprocessing methods include binarization and mean removal; Correspondingly, the determination of the at least one air leakage area inside the mine based on the plurality of internal images includes: Determine the at least one air leakage area inside the mine based on the plurality of preprocessed internal images.

6. The variable frequency control method of an AC variable frequency fan according to claim 1, wherein After controlling the variable frequency fan to work based on the target variable frequency, the method further includes: For the mine interior after exhausting, obtain the gas content after exhausting corresponding to the target dangerous gas discharge type; Determine whether the environment inside the mine after exhausting is in a safe state based on the gas content after exhausting and the early warning gas content corresponding to the target dangerous gas discharge type; If not, determine the air leakage amount and the gas discharge amount again and adjust them until the environment inside the mine is in a safe state; Otherwise, determine that the environment inside the mine after exhausting is in a safe state.

7. The variable frequency control method of an AC variable frequency fan according to claim 1, wherein Before controlling the variable frequency fan to work based on the target variable frequency, the method further includes: Generating a variable frequency reminder signal of the variable frequency fan to remind the personnel inside the mine to move to a designated location; Obtaining the image of the designated location and the personnel information inside the mine after a preset time period; Determine whether all personnel inside the mine have moved to the designated location based on the image of the designated location and the personnel information inside the mine; Correspondingly, the controlling of the variable frequency fan to work based on the target variable frequency includes: If yes, control the variable frequency fan to work based on the target variable frequency.

8. A frequency control device for an AC variable speed fan, characterized by The method includes: An acquisition module is configured to acquire dangerous gas information inside a mine and a plurality of internal images inside the mine, wherein the dangerous gas information includes a plurality of dangerous gas types and respective current gas contents; An air leakage area determination module is configured to determine at least one air leakage area inside the mine based on the plurality of internal images, so as to release detection gas in the air leakage area; An air leakage amount determination module is configured to acquire the detection gas concentration and the detection gas flow corresponding to each air leakage area, and determine the air leakage amount of the mine based on the detection gas concentration and the detection gas flow corresponding to all air leakage areas; The dangerous gas emission information determination module is configured to determine the gas emission amount of the mine corresponding to each dangerous gas type based on the current gas content corresponding to each dangerous gas type and the corresponding early warning gas content; The target variable frequency frequency determination module is configured to determine the target variable frequency frequency of the variable frequency fan based on the air leakage amount and the gas emission amount; The variable frequency fan control module is configured to control the variable frequency fan to work based on the target variable frequency frequency. In the process of determining the target variable frequency frequency of the variable frequency fan based on the air leakage amount and the gas emission amount, the target variable frequency frequency determination module is configured to calculate the difference between the gas emission amount and the air leakage amount to obtain the total air exchange amount; determine the target variable frequency frequency corresponding to the total air exchange amount based on the correspondence between the preset total air exchange amount and the variable frequency frequency and the total air exchange amount, wherein the correspondence between the preset total air exchange amount and the variable frequency frequency is obtained based on a plurality of historical total air exchange amounts and historical target variable frequency frequencies, and the process of obtaining the correspondence based on a plurality of historical total air exchange amounts and historical target variable frequency frequencies includes: for the preset total air exchange amount, obtaining all variable frequency frequencies corresponding to the preset total air exchange amount, determining the variable frequency frequency with the highest usage frequency as the variable frequency frequency corresponding to the preset total air exchange amount based on all the variable frequency frequencies, and obtaining the variable frequency frequency corresponding to each of all the preset total air exchange amounts.

9. A variable speed fan, characterized by Comprise: At least one processor; Memory; At least one application program, wherein the at least one application program is stored in the memory and is configured to be executed by the at least one processor, and the at least one application program is configured to execute the variable frequency control method of the alternating current variable frequency fan according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and when the computer program is executed in a computer, the computer program causes the computer to execute the variable frequency control method of the alternating current variable frequency fan according to any one of claims 1-7.

Images