Mining optical fiber wind speed sensor and detection system

Abstract

The invention relates to the technical field of mine ventilation, in particular to a mining optical fiber wind speed sensor and a detection system. The mining optical fiber wind speed sensor comprises a shell, wherein a main air channel, a first sub-air channel and a second sub-air channel which are communicated with one another are formed in the shell; the dust removal assembly is arranged in the main air duct and blocks the flowing direction of the air flow; the airflow is separated into first airflow and second airflow after flowing through the dust removal assembly, and the first airflow comprises impurities; the speed measuring assembly is arranged in the second sub-air duct and located on the outlet side of the second sub-air duct, and the speed measuring assembly is configured to measure the air speed of the second airflow; wherein airflow enters the shell through the inlet of the main air duct and is separated into first airflow and second airflow through the dust removal assembly, the first airflow flows out of the shell through the first sub air duct, and the second airflow flows out of the shell through the speed measurement assembly in the second sub air duct. Impurities in airflow flowing into the sensor are removed twice, so that the problem that the impurities damage the sensor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of mine ventilation, and in particular to a mine-used optical fiber wind speed sensor and a detection system. Background Art

[0002] The mine ventilation system is an important guarantee for the safe production of mines, and plays a very important role in protecting the health of workers and preventing gas or dust explosion accidents. Therefore, real-time measurement of mine ventilation parameters is of great significance to ensure the safe production of mines. In order to measure the wind speed in the mine, an electronic wind speed measuring device based on ultrasonic, thermal or traditional mechanical methods is used to measure the ventilation parameters in the mine. However, the electronic wind speed measuring device based on ultrasonic, thermal or traditional mechanical methods has unavoidable electromagnetic field interference, which leads to test errors.

[0003] In order to solve the problem of electromagnetic interference, in the related technology, the fiber optic wind speed monitoring method is used to measure the ventilation parameters in the mine. The fiber optic wind speed monitoring method has the advantages of intrinsic safety and anti-electromagnetic interference. In recent years, it has become a research hotspot for coal mine safety detection. At present, the fiber optic wind speed monitoring method is mainly based on the fiber grating structure. The refractive index of the fiber grating structure is affected by temperature and strain, which causes the center wavelength of the fiber grating structure to drift. The relationship between the center wavelength drift and the physical quantity to be measured is derived, thereby realizing the measurement of the wind speed in the mine. The main forms of the structure are wind cup type, differential pressure type, etc. The principle is to deform the fiber grating structure through the bending deformation of the force-bearing structure. However, this type of monitoring method has a minimum starting wind speed and is insensitive to the measurement of low wind speeds.

[0004] In order to improve the sensor's ability to detect low wind speeds, a hot-wire fiber optic anemometer monitoring method is used. A special structure or doped optical fiber is used to convert light energy into heat energy, which heats the fiber grating. When the wind flows through the sensing structure, the temperature decreases, causing the wavelength of the fiber grating center to change. The hot-wire fiber optic anemometer has the advantages of high sensitivity and stable structure. However, when the hot-wire fiber optic anemometer detects the airflow in the mine, some impurities (such as dust particles, oil mist, water vapor, etc.) carried by the airflow in the mine will directly collide with the speed measuring device of the hot-wire fiber optic anemometer, causing the hot-wire fiber optic anemometer to be contaminated or damaged. Summary of the invention

[0005] The embodiment of the present application provides a mining optical fiber wind speed sensor and detection system, which removes impurities in the airflow flowing into the sensor twice, thereby reducing the impurities in the airflow without affecting the wind speed measurement, thereby reducing the problem of impurities causing damage to the sensor.

[0006] In some embodiments, a mining fiber optic wind speed sensor is provided, wherein the airflow includes a first airflow and a second airflow, the first airflow includes impurities, and the mining fiber optic wind speed sensor includes: a shell, wherein a main air duct, a first sub-air duct and a second sub-air duct are provided in the shell; a dust removal assembly, arranged in the main air duct, the dust removal assembly blocks the flow direction of the airflow; the airflow is separated into the first airflow and the second airflow after passing through the dust removal assembly; a speed measuring assembly, arranged in the second sub-air duct and located at the outlet side of the second sub-air duct, the speed measuring assembly is configured to measure the wind speed of the second airflow; wherein the airflow enters the shell through the inlet of the main air duct, flows through the dust removal assembly and is separated into the first airflow and the second airflow, the first airflow flows out of the shell from the first sub-air duct, and the second airflow flows out of the shell after passing through the speed measuring assembly in the second sub-air duct.

[0007] The mining optical fiber wind speed sensor provided in the embodiment of the present application is used to remove impurities (such as dust particles, oil mist, water vapor, etc.) in the airflow through a dust removal component, thereby reducing impurities in the airflow without affecting the wind speed measurement, thereby reducing the problem of impurities causing damage to the sensor.

[0008] Optionally, the first sub-air duct includes a first air inlet and a first air outlet; the second sub-air duct includes a second air inlet and a second air outlet; the main air duct includes: a first dust removal section; the first dust removal section includes a first sub-air inlet and a first sub-air outlet; a second dust removal section; the second dust removal section includes a second sub-air inlet and a second sub-air outlet; the first sub-air outlet is connected to the second sub-air inlet and the first air inlet, and the second sub-air outlet is connected to the second air inlet; the first air outlet, the second air outlet and the first sub-air inlet are opened on the surface of the shell; An obtuse angle is formed between the central axis of the first dust removal section and the central axis of the second dust removal section, and the second sub-air outlet is higher than the first sub-air outlet.

[0009] Optionally, the dust removal assembly includes: a first dust removal part, which is protruding from the upper side wall of the first dust removal section and is arranged relative to the first sub-air inlet; a gap is provided between the lower end of the first dust removal part and the lower side wall of the first dust removal section for airflow to flow through; the gap is arranged relative to the second air outlet; the airflow is separated into a first sub-airflow and a second sub-airflow after passing through the first dust removal part, the first sub-airflow includes the first airflow, and the second sub-airflow includes the first airflow and the second airflow; the first sub-airflow flows out of the shell through the first sub-air duct; the second sub-airflow flows into the second dust removal section.

[0010] Optionally, the dust removal assembly also includes a second dust removal part, which is arranged on the side wall of the second dust removal section and is located on the second sub-outlet side; the second sub-airflow flows through the second dust removal part in the second dust removal section and is separated into a first airflow and a second airflow; the first airflow enters the first sub-air duct, and the second airflow continues to pass through the second sub-air duct; the second air outlet is higher than the second air inlet.

[0011] Optionally, the second dust removal part includes: a contraction section pipe wall, the inlet port diameter of the contraction section pipe wall is larger than the outlet port diameter, and the diameter of the contraction section pipe wall gradually decreases from the inlet end to the outlet end.

[0012] Optionally, the speed measuring component includes: a detection element, which is arranged in the second sub-air duct; the detection element is configured to measure the wind speed of the second airflow; and an insulation component, through which the detection element is fixedly connected to the pipe wall of the second sub-air duct.

[0013] Optionally, the detection element includes: a protective tube, which is fixedly connected to the tube wall of the second sub-air duct through an insulation component; and a speed measuring optical fiber, which is inserted into the protective tube.

[0014] Optionally, one end of the speed measuring optical fiber passes through the thermal insulation component and the shell to extend out of the shell.

[0015] Optionally, the insulation assembly includes: a first insulation component, which is arranged at the first end of the protective tube; a second insulation component, which is arranged at the second end of the protective tube; the first end and the second end are opposite ends of the protective tube; the first insulation component and the second insulation component are fixedly connected to the opposite pipe walls of the second sub-air duct through threads respectively.

[0016] In some embodiments, a mining optical fiber wind speed detection system is provided, comprising: a mining optical fiber wind speed sensor as in any of the above embodiments, the mining optical fiber wind speed sensor being configured to output an optical signal corresponding to the wind speed of a second airflow; a demodulation device connected to a speed measurement component of the mining optical fiber wind speed sensor; the demodulation device being configured to receive the optical signal and to obtain the wind speed of the second airflow based on demodulation of the optical signal.

[0017] It can be understood that the beneficial effects that can be achieved by the technical solution provided by the above-mentioned mining optical fiber wind speed detection system can be referred to the beneficial effects of the mining optical fiber wind speed sensor and any of its optional embodiments, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the structure of a mining optical fiber wind speed sensor provided in an embodiment of the present application; Figure 2 for Figure 1 A cross-sectional view of a mining optical fiber wind speed sensor in the illustrated embodiment; Figure 3 A schematic diagram of airflow provided in an embodiment of the present application; Figure 4Another airflow schematic diagram provided for an embodiment of the present application; Figure 5 This is a structural block diagram of the mining optical fiber wind speed detection system provided in an embodiment of the present application.

[0020] Reference numerals: 100, optical fiber wind speed sensor for mining; 200, demodulation equipment; 2001, computer; 2002, mobile phone; 10. Shell; 101. Main air duct; 1011. First dust removal section; 1012. First sub-air inlet; 1013. First sub-air outlet; 1014. Second dust removal section; 1015. Second sub-air inlet; 1016. Second sub-air outlet; 1016a. First outlet; 1016b. Second outlet; 102. First sub-air duct; 1021. First air inlet; 1022. First air outlet; 103. Second sub-air duct; 1031. Second air inlet; 1032. Second air outlet; 20. dust removal assembly; 201. first dust removal unit; 202. second dust removal unit; 30. Speed ​​measuring component; 301. Detection element; 3011. Speed ​​measuring optical fiber; 302. Thermal insulation component; 3021. First thermal insulation component; 3022. Second thermal insulation component. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, other embodiments obtained by ordinary technicians in this field without making creative work all belong to the protection scope of the present application.

[0022] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0023] In addition, in the present application, directional terms such as "upper", "lower", "inner" and "outer" are defined relative to the orientation of the components schematically placed in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components placed in the drawings.

[0024] In order to facilitate the understanding of the technical solution of the application, the relevant technologies involved in this application are first explained below.

[0025] The mine ventilation system is an important guarantee for the safe production of mines, and plays a very important role in protecting the health of workers and preventing gas or dust explosion accidents. Therefore, real-time measurement of mine ventilation parameters is of great significance to ensure the safe production of mines. In order to measure the wind speed in the mine, an electronic wind speed measuring device based on ultrasonic, thermal or traditional mechanical methods is used to measure the ventilation parameters in the mine. However, the electronic wind speed measuring device based on ultrasonic, thermal or traditional mechanical methods has unavoidable electromagnetic field interference, which leads to test errors.

[0026] In order to solve the problem of electromagnetic interference, in the related technology, the fiber optic wind speed monitoring method is used to measure the ventilation parameters in the mine. The fiber optic wind speed monitoring method has the advantages of intrinsic safety and anti-electromagnetic interference. In recent years, it has become a research hotspot for coal mine safety detection. At present, the fiber optic wind speed monitoring method is mainly based on the fiber grating structure. The refractive index of the fiber grating structure is affected by temperature and strain, which causes the center wavelength of the fiber grating structure to drift. The relationship between the center wavelength drift and the physical quantity to be measured is derived, thereby realizing the measurement of the wind speed in the mine. The main forms of the structure are wind cup type, differential pressure type, etc. The principle is to deform the fiber grating structure through the bending deformation of the force-bearing structure. However, this type of monitoring method has a minimum starting wind speed and is insensitive to the measurement of low wind speeds.

[0027] In order to solve the problem of impurities damaging the sensor, the embodiment of the present application provides a mining optical fiber wind speed sensor 100 and a detection system, which reduces the impurities in the airflow flowing into the sensor without affecting the wind speed measurement, thereby reducing the problem of impurities damaging the sensor.

[0028] Figure 1 This is a schematic diagram of the structure of the optical fiber wind speed sensor for mining provided in an embodiment of the present application.

[0029] Figure 2 for Figure 1 A cross-sectional view of a fiber optic wind speed sensor for use in a mine in the illustrated embodiment.

[0030] Combination Figure 1 and Figure 2As shown, the embodiment of the present application provides a mining optical fiber wind speed sensor 100, the airflow includes a first airflow and a second airflow, the first airflow includes impurities, and the mining optical fiber wind speed sensor 100 includes: a housing 10, a dust removal component 20 and a speed measurement component 30. The housing 10 is provided with a main air duct 101, a first sub-air duct 102 and a second sub-air duct 103 that are connected. The dust removal component 20 is arranged in the main air duct 101, and the dust removal component 20 blocks the flow direction of the airflow. After the airflow passes through the dust removal component 20, it is separated into the first airflow and the second airflow. The speed measurement component 30 is arranged in the second sub-air duct 103 and is located at the outlet side of the second sub-air duct 103. The speed measurement component 30 is configured to measure the wind speed of the second airflow. Among them, the air flow enters the shell 10 through the inlet of the main air duct 101, flows through the dust removal component 20 and is separated into a first air flow and a second air flow. The first air flow flows out of the shell 10 through the first sub-air duct 102, and the second air flow flows out of the shell 10 after passing through the speed measuring component 30 in the second sub-air duct 103.

[0031] The mining optical fiber wind speed sensor 100 provided in the embodiment of the present application is used to remove impurities (such as dust particles, oil mist, water vapor, etc.) in the airflow through the dust removal component 20, thereby reducing the impurities in the airflow without affecting the wind speed measurement, thereby reducing the problem of impurities causing damage to the sensor.

[0032] Specifically, the dust removal component 20 sets obstacles in the flow direction of the airflow to reduce the flow speed of the airflow by blocking the flow direction of the airflow, so that the dust particles, oil mist, water vapor, etc. in the airflow combine to form heavier aggregates, and the aggregates settle to the lower part of the main air duct 101 under the action of gravity. The aggregates are then carried by the airflow to form a first airflow, which enters the first sub-air duct 102 and then leaves the housing 10 from the first sub-air duct 102, thereby reducing impurities in the airflow. The remaining part of the airflow is the second airflow, which has fewer impurities. When it flows through the speed measuring component 30 in the second sub-air duct 103, the wind speed is measured by the speed measuring component 30, thereby reducing the problem of impurities causing damage to the speed measuring component 30.

[0033] Figure 3 A schematic diagram of air flow provided in an embodiment of the present application.

[0034] For example, in combination Figure 3As shown, the airflow M enters the main air duct 101 (the airflow M includes impurities Z). When the airflow M contacts the dust removal component 20, the dust removal component 20 blocks the flow direction of the airflow M, causing the impurities (dust particles, oil mist, water vapor) in the airflow M to gather into aggregates, so that under the action of gravity, the aggregates (impurities Z) are driven by the airflow to form the first airflow N1, so that the first airflow N1 is discharged from the housing 10 from the first sub-air duct 102. As the first airflow N1 is discharged, the impurities Z in the airflow M are also taken away and removed, and the impurity content in the second airflow N2 is relatively low. When the second airflow N2 flows in the second sub-air duct 103, the second airflow N2 will flow through the speed measuring component 30 to achieve the measurement of the wind speed of the second airflow N2 and reduce the problem of impurities causing damage to the speed measuring component 30.

[0035] Optionally, combined Figure 2 As shown, the first sub-air duct 102 includes a first air inlet 1021 and a first air outlet 1022, and the second sub-air duct 103 includes a second air inlet 1031 and a second air outlet 1032. The main air duct 101 includes: a first dust removal section 1011 and a second dust removal section 1014. The first dust removal section 1011 includes a first sub-air inlet 1012 and a first sub-air outlet 1013. The second dust removal section 1014 includes a second sub-air inlet 1015 and a second sub-air outlet 1016. The first sub-air outlet 1013 is connected to the second sub-air inlet 1015 and the first air inlet 1021, and the second sub-air outlet 1016 is connected to the second air inlet 1031. The first air outlet 1022, the second air outlet 1032 and the first sub-air inlet 1012 are opened on the surface of the housing 10. There is an obtuse angle between the central axis of the first dust removal section 1011 and the central axis of the second dust removal section 1014 , and the second sub-air outlet 1016 is higher than the first sub-air outlet 1013 .

[0036] In this embodiment, by dividing the first dust removal section 1011 and the second dust removal section 1014, the airflow is dust-removed twice, that is, the airflow is impurity-removed twice, the amount of impurities removed is increased, and the content of impurities in the second airflow is further reduced, thereby reducing the problem of impurities causing damage to the speed measuring component 30. In addition, by defining an obtuse angle between the central axis of the first dust removal section 1011 and the central axis of the second dust removal section 1014, and the second sub-air outlet 1016 is higher than the first sub-air outlet 1013, the airflow will continue to flow in the second dust removal section 1014 in an upward direction after passing through the first dust removal section 1011, so that the impurities can be condensed into aggregates in the second dust removal section 1014, and then vertically settled along the second dust removal section 1014 under the action of gravity, so that the aggregates are carried by the airflow to form the first airflow, and then discharged from the first air duct to the housing 10.

[0037] It should be understood that the air outlet provided in the above embodiment is connected with the air inlet, which means that the airflow out of the air outlet can enter the air inlet, and it does not limit the air outlet and the air inlet to be connected physically. For example, the first sub-air outlet 1013 is not actually connected with the first air inlet 1021 physically, but the first sub-air outlet 1013 is arranged relative to the first air inlet 1021, so the airflow out of the first sub-air outlet 1013 can directly enter the first air inlet 1021, so "the first sub-air outlet 1013 is connected with the first air inlet 1021" includes that the airflow out of the first sub-air outlet 1013 can directly enter the first air inlet 1021.

[0038] Optionally, the first dust removal section 1011 is arranged in a horizontal direction, and the second dust removal section 1014 is arranged in a vertical direction.

[0039] Optionally, combined Figure 2 As shown, the dust removal assembly 20 includes a first dust removal section 201 and a second dust removal section 202. The first dust removal section 201 is designed in the form of a baffle, which has a simple structure. The aggregates formed by the condensation of debris are placed at the bottom of the first dust removal section 1011 through the resistance of the baffle and the action of gravity, and an air outlet is provided to discharge most of the debris. At the same time, the second dust removal section 202 is designed in the rising section of the airflow. The second dust removal section 202 adopts a conical structure, and also uses resistance and gravity to block debris, and has a simple structure.

[0040] Optionally, combined Figure 2 As shown, the dust removal assembly 20 includes: a first dust removal part 201. The first dust removal part 201 is protrudingly arranged on the upper side wall of the first dust removal section 1011, and is arranged relative to the first sub-air inlet 1012; a gap is provided between the lower end of the first dust removal part 201 and the lower side wall of the first dust removal section 1011 for airflow to flow through; the gap is arranged relative to the second air outlet 1032; the airflow is separated into a first sub-airflow and a second sub-airflow after passing through the first dust removal part 201, the first sub-airflow includes the first airflow, and the second sub-airflow includes the first airflow and the second airflow; the first sub-airflow flows out of the housing 10 through the first sub-air duct 102; the second sub-airflow flows into the second dust removal section 1014.

[0041] In this embodiment, by setting the first dust removal part 201 relative to the first sub-air inlet 1012 and protruding from the upper side wall of the first dust removal section 1011, after the airflow enters the first dust removal section 1011, the airflow is blocked by the first dust removal part 201, the flow rate of the airflow is slowed down, and part of the airflow is refluxed after being hit by the first dust removal part 201, colliding with the subsequent airflow, and the impurities in the airflow condense into aggregates. The aggregates settle to the bottom of the first dust removal section 1011 under the action of gravity, and are carried by the airflow to form the first sub-airflow. Since the gap between the lower end of the first dust removal part 201 and the lower side wall of the first dust removal section 1011 is set relative to the second air outlet 1032, the first sub-airflow flows out of the housing 10 from the first sub-air duct 102. The initial dust removal of the airflow is achieved, and the problem of impurities causing damage to the speed measuring component 30 is reduced.

[0042] Optionally, the first dust removal section 201 includes a baffle, which is arranged on the upper side wall of the first dust removal section 1011, and the vertical length of the baffle is smaller than the vertical length of the first dust removal section 1011 to form a gap between the lower end of the baffle and the lower side wall of the first dust removal section 1011.

[0043] Specifically, the baffle forms a side wall of the second dust removal section 1014 relative to the side of the second air outlet 1032 .

[0044] Optionally, the first dust removal part 201 includes a protrusion, which is protruding from the upper side wall of the first dust removal section 1011, and the vertical length of the protrusion is smaller than the vertical length of the first dust removal section 1011 to form a gap between the lower end of the protrusion and the lower side wall of the first dust removal section 1011.

[0045] Optionally, combined Figure 2 As shown, the dust removal assembly 20 further includes: a second dust removal part 202. The second dust removal part 202 is arranged on the side wall of the second dust removal section 1014 and is located on the side of the second sub-air outlet 1016; the second sub-airflow flows through the second dust removal part 202 in the second dust removal section 1014 and is separated into a first airflow and a second airflow; the first airflow enters the first sub-air duct 102, and the second airflow continues to pass through the second sub-air duct 103; the second air outlet 1032 is higher than the second air inlet 1031.

[0046] In this embodiment, by setting the second dust removal part 202 located on the side wall of the second dust removal section 1014, after the second sub-airflow flows through the second dust removal part 202, the second sub-airflow is blocked by the second dust removal part 202, slowing down the flow rate of the airflow, and part of the airflow is refluxed after being hit by the second dust removal part 202, colliding with the subsequent airflow, and the impurities in the airflow condense into aggregates. Under the action of gravity, the aggregates vertically settle to the bottom of the second dust removal section 1014 along the second dust removal section 1014, and are carried by the airflow to form the first airflow, and the first airflow flows into the first sub-air duct 102 along the first air inlet 1021, and then flows out of the housing 10. The airflow is dusted again, reducing the problem of impurities causing damage to the speed measuring component 30.

[0047] Optionally, the first sub-air outlet 1013 includes a first port 1016a and a second port 1016b, the first port 1016a is connected to the first air inlet 1021, and the second port 1016b is connected to the second air inlet 1031. After the second sub-airflow is divided into the first airflow and the second airflow, the first airflow enters the first sub-air duct 102 through the first port 1016a, and the second airflow enters the second sub-air duct 103 through the second port 1016b.

[0048] Optionally, the second dust removal part 202 includes: a contraction section pipe wall. The inlet port diameter of the contraction section pipe wall is larger than the outlet port diameter, and the diameter of the contraction section pipe wall gradually decreases from the inlet end to the outlet end. In this way, the second dust removal part 202 is set as a contraction section pipe wall to achieve the functions of blocking, decelerating, and removing dust from the second sub-airflow.

[0049] Exemplarily, the second dust removing part 202 has a tapered tube wall.

[0050] Figure 4 Another schematic diagram of air flow provided in an embodiment of the present application.

[0051] For example, in combination Figure 4As shown, the airflow M includes impurities Z, and the impurities Z include first impurities Z1 and second impurities Z2. After entering the first dust removal section 1011, the airflow M encounters the first dust removal section 201. Under the action of the first dust removal section 201, the first impurities Z1 in the airflow M condense to form aggregates, and the aggregates formed by the first impurities Z1 settle to the lower side of the first dust removal section 1011 under the action of gravity to form a first sub-airflow L1, and the first sub-airflow L1 includes the first airflow N1. The first sub-airflow L1 enters the first sub-air duct 102 through the first air inlet 1021 connected to the first sub-air outlet 1013, and then is discharged from the housing 10 through the first air outlet 1022. The remaining second sub-airflow L2 includes the second impurity Z2. The second sub-airflow L2 continues to enter the second dust removal section 1014, and encounters the second dust removal section 202 after rising along the second dust removal section 1014. Under the action of the second dust removal section 202, the second impurities Z2 in the second sub-airflow L2 condense to form aggregates, and the aggregates formed by the second impurities Z2 settle to the lower side of the second dust removal section 1014 under the action of gravity, and are carried by the airflow to form the first airflow N1. The first airflow N1 contains the first impurities Z1 and the second impurities Z2, thereby realizing secondary dust removal of the airflow. The remaining airflow of the second sub-airflow L2 forms the second airflow N2, which enters the second sub-air duct 103 through the second air inlet 1031. When flowing through the speed measuring component 30 of the second sub-air duct 103, the speed measuring component 30 measures the wind speed of the second airflow, thereby realizing the measurement of the wind speed of the second airflow, that is, measuring the ventilation parameters in the mine, and reducing the problem of impurities entrained by the airflow in the mine causing damage to the speed measuring component 30.

[0052] Exemplarily, the ventilation parameter in the mine may be represented by the wind speed of the second airflow.

[0053] Optionally, the second sub-air duct 103 includes a first section and a second section. The first section is located on one side of the second air inlet 1031, and the first section is connected to the second dust removal section 202. The second section is located on one side of the second air outlet 1032. The caliber of the first section is smaller than the caliber of the second section. The caliber of the first section is smaller than the caliber of the second dust removal section 202. In this way, the second dust removal section 202, the first section and the second section form a venturi tube structure, which can rectify the second airflow and make the wind speed of the second airflow more stable.

[0054] Optionally, combined Figure 2 As shown, the speed measuring component 30 includes: a detection element 301 and a heat insulation component 302. The detection element 301 is arranged in the second sub-air duct 103. The detection element 301 is configured to measure the wind speed of the second airflow. The detection element 301 is fixedly connected to the pipe wall of the second sub-air duct 103 through the heat insulation component 302.

[0055] In this embodiment, by arranging the detection element 301 and the insulation component 302 in the second sub-air duct 103, the wind speed of the second airflow in the second sub-air duct 103 is measured by using the detection element 301. The insulation component 302 can isolate the heat generated by the detection element 301 when measuring the second airflow, thereby reducing the influence of the heat generated by measuring the wind speed on the housing 10.

[0056] Exemplarily, the housing 10 is a stainless steel housing 10. In the embodiment of the present application, light energy is converted into heat energy to heat the fiber grating in the detection element 301. When the second airflow passes through the detection element 301, the temperature decreases, causing the wavelength of the center of the fiber grating to change, thereby realizing a technical solution for measuring the wind speed of the second airflow.

[0057] Optionally, combined Figure 2 As shown, the detection element 301 includes: a protective tube and a speed measuring optical fiber 3011. The protective tube is fixedly connected to the tube wall of the second sub-air duct 103 through the heat insulation component 302. The speed measuring optical fiber 3011 is inserted into the protective tube.

[0058] In this embodiment, a protective tube is provided to protect the speed measuring optical fiber 3011 , thereby improving the mechanical strength of the detection element 301 and further reducing the problem of impurities damaging the speed measuring component 30 .

[0059] Optionally, combined Figure 2 As shown, one end of the speed measuring optical fiber 3011 passes through the insulation component 302 and the housing 10 to extend out of the housing 10.

[0060] In this embodiment, one end of the speed measuring optical fiber 3011 is extended out of the housing 10 to receive the optical signal in the speed measuring optical fiber 3011, thereby measuring the wind speed of the second airflow by demodulating the change in the central wavelength of the fiber grating.

[0061] Optionally, combined Figure 2 As shown, the heat insulation assembly 302 includes: a first heat insulation member 3021 and a second heat insulation member 3022. The first heat insulation member 3021 is arranged at the first end of the protective tube; the second heat insulation member 3022 is arranged at the second end of the protective tube; the first end and the second end are opposite ends of the protective tube. The first heat insulation member 3021 and the second heat insulation member 3022 are respectively fixedly connected to the opposite tube wall of the second sub-air duct 103 by threads.

[0062] In this embodiment, the first heat insulating member 3021 and the second heat insulating member 3022 are fixed by using threads, so as to facilitate the disassembly and assembly of the first heat insulating member 3021 and the second heat insulating member 3022, thereby facilitating the disassembly and assembly of the detection element 301.

[0063] Figure 5 This is a structural block diagram of the mining optical fiber wind speed detection system provided in an embodiment of the present application.

[0064] Combination Figure 5 As shown, the embodiment of the present application also provides a mine optical fiber wind speed detection system, comprising: a mine optical fiber wind speed sensor 100 and a demodulation device 200 provided in any one of the above embodiments. The mine optical fiber wind speed sensor 100 is configured to output an optical signal corresponding to the wind speed of the second airflow. The demodulation device 200 is connected to the speed measurement component 30 of the mine optical fiber wind speed sensor 100. The demodulation device 200 is configured to receive the optical signal and demodulate the optical signal to obtain the wind speed of the second airflow.

[0065] The mining optical fiber wind speed detection system provided in the embodiment of the present application is used to achieve secondary dust removal of the airflow measured by the mining optical fiber wind speed sensor 100, thereby reducing the damage caused by impurities in the airflow to the mining optical fiber wind speed sensor 100. By using the measurement component to measure the airflow speed, the sensor's ability to detect low wind speeds is improved, and the detection range of the mining optical fiber wind speed detection system is increased.

[0066] Specifically, the demodulation device 200 is connected to the speed measuring optical fiber 3011 of the mining optical fiber wind speed sensor 100 to receive the optical signal in the temperature measuring optical fiber.

[0067] Specifically, combined Figure 5 As shown, the demodulation device 200 includes but is not limited to one or more of a computer 2001, a mobile phone 2002, a tablet computer (not shown in the figure) and a mobile wearable device (not shown in the figure). It is sufficient that the data demodulation device 200 can realize the above functions.

[0068] It should be noted that those skilled in the art will easily think of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope of the present application is indicated by the claims.

[0069] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A mine-used optical fiber wind speed sensor, characterized in that: The airflow comprises a first airflow and a second airflow, the first airflow comprises impurities, and the mining optical fiber wind speed sensor (100) comprises: A housing (10), wherein a main air duct (101), a first sub-air duct (102), and a second sub-air duct (103) are provided in the housing (10); A dust removal component (20) is arranged in the main air duct (101), the dust removal component (20) blocks the flow direction of the airflow; after the airflow passes through the dust removal component (20), it is separated into the first airflow and the second airflow; a speed measuring component (30), arranged in the second sub-air duct (103) and located at the outlet side of the second sub-air duct (103), the speed measuring component (30) being configured to measure the wind speed of the second air flow; The airflow enters the housing (10) through the inlet of the main air duct (101), flows through the dust removal component (20) and is separated into the first airflow and the second airflow; the first airflow flows out of the housing (10) through the first sub-air duct (102), and the second airflow flows out of the housing (10) after passing through the speed measuring component (30) in the second sub-air duct (103).

2. The optical fiber wind speed sensor for mining according to claim 1, characterized in that: The first sub-air duct (102) comprises a first air inlet (1021) and a first air outlet (1022); the second sub-air duct (103) comprises a second air inlet (1031) and a second air outlet (1032); The main air duct (101) comprises: A first dust removal section (1011); the first dust removal section (1011) comprises a first sub-air inlet (1012) and a first sub-air outlet (1013); A second dust removal section (1014); the second dust removal section (1014) comprises a second sub-air inlet (1015) and a second sub-air outlet (1016); The first sub-air outlet (1013) is connected to the second sub-air inlet (1015) and the first air inlet (1021), and the second sub-air outlet (1016) is connected to the second air inlet (1031); The first air outlet (1022), the second air outlet (1032) and the first sub-air inlet (1012) are provided on the surface of the shell (10); An obtuse angle is formed between the central axis of the first dust removal section (1011) and the central axis of the second dust removal section (1014), and the second sub-air outlet (1016) is higher than the first sub-air outlet (1013).

3. The optical fiber wind speed sensor for mining according to claim 2, characterized in that: The dust removal component (20) comprises: a first dust removal portion (201), the first dust removal portion (201) being protrudingly arranged on the upper side wall of the first dust removal section (1011), and being arranged relative to the first sub-air inlet (1012); a gap being provided between the lower end of the first dust removal portion (201) and the lower side wall of the first dust removal section (1011) for the airflow to flow through; the gap being arranged relative to the second air outlet (1032); After passing through the first dust removal section (201), the airflow is separated into a first sub-airflow and a second sub-airflow, the first sub-airflow including the first airflow, and the second sub-airflow including the first airflow and the second airflow; the first sub-airflow flows out of the housing (10) through the first sub-air duct (102); and the second sub-airflow flows into the second dust removal section (1014).

4. The optical fiber wind speed sensor for mining according to claim 3, characterized in that: The dust removal component (20) further comprises: A second dust removal portion (202), the second dust removal portion (202) being arranged on a side wall of the second dust removal section (1014) and located on the side of the second sub-air outlet (1016); The second sub-airflow flows through the second dust removal section (202) in the second dust removal section (1014) and is separated into the first airflow and the second airflow; the first airflow enters the first sub-air duct (102), and the second airflow continues to pass through the second sub-air duct (103); The second air outlet (1032) is higher than the second air inlet (1031).

5. The optical fiber wind speed sensor for mining according to claim 4, characterized in that: The second dust removal part (202) comprises: The tube wall of the contraction section has an inlet port diameter greater than an outlet port diameter, and the diameter of the tube wall of the contraction section gradually decreases from the inlet end to the outlet end.

6. The optical fiber wind speed sensor for mining according to any one of claims 1 to 5, characterized in that: The speed measuring component (30) comprises: A detection element (301) is disposed in the second sub-air duct (103); the detection element (301) is configured to measure the wind speed of the second airflow; A heat insulation component (302), wherein the detection element (301) is fixedly connected to the pipe wall of the second sub-air duct (103) via the heat insulation component (302).

7. The optical fiber wind speed sensor for mining according to claim 6, characterized in that: The detection element (301) comprises: a protective tube, the protective tube being fixedly connected to the tube wall of the second sub-air duct (103) via the heat insulation component (302); A speed measuring optical fiber (3011), wherein the speed measuring optical fiber (3011) is passed through the protective tube.

8. The optical fiber wind speed sensor for mining according to claim 7, characterized in that: One end of the speed measuring optical fiber (3011) is passed through the thermal insulation component (302) and the shell (10) so as to extend out of the shell (10).

9. The optical fiber wind speed sensor for mining according to claim 7, characterized in that: The thermal insulation assembly (302) comprises: A first heat insulating member (3021) is arranged at a first end of the protective tube; A second heat insulating member (3022) is arranged at the second end of the protective tube; the first end and the second end are two opposite ends of the protective tube; The first heat insulating member (3021) and the second heat insulating member (3022) are respectively fixedly connected to the opposite tube walls of the second sub-air duct (103) via threads.

10. A mine-used optical fiber wind speed detection system, characterized in that: include: The mining optical fiber wind speed sensor (100) according to any one of claims 1 to 9, wherein the mining optical fiber wind speed sensor (100) is configured to output an optical signal corresponding to the wind speed of the second airflow; A demodulation device (200) is connected to the speed measuring component (30) of the mining optical fiber wind speed sensor (100); the demodulation device (200) is configured to receive the optical signal and demodulate the optical signal to obtain the wind speed of the second airflow.

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