Air purge cooling device based on laser range finder

Abstract

The application provides an air blowing and cooling device based on a laser range finder, comprising an oil-free screw air compressor, a first blowing device, a second blowing device and a third blowing device. The first blowing device is a rectangular box, a blowing hole is formed in one side end face of the first blowing device from top to bottom, and a laser emitter is arranged on one side of the blowing hole. The second blowing device is an annular pipeline, the second blowing device is provided with blowing holes along an annular upper end face, and the second blowing device is arranged below a laser dustproof lens. The third blowing device is an annular pipeline, the third blowing device is provided with blowing holes along an annular lower end face, and the third blowing device is arranged above a rotor angle steel reflecting plate. The air blowing and cooling device enables the laser emitter to continuously and stably work in a suitable temperature space, the laser dustproof lens and the rotor angle steel reflecting plate are clean and pollution-free, the transmission rate and the reflection receiving rate of the laser are improved, and the stability and accuracy of the laser ranging are ensured.

Description

Technical Field

[0001] This application relates to the field of air leakage control technology for sector plates in air preheaters of thermal power plants, and in particular to an air purging and cooling device based on a laser rangefinder. Background Technology

[0002] A rotary air preheater in a thermal power plant refers to an air preheater where the rotor rotates while the fan remains stationary. High-temperature flue gas from the boiler furnace flows downwards across one side of the preheater rotor, heating the heat storage elements within it. As the heated heat storage elements rotate to the other side with the rotor, cold air flows upwards through them, carrying away the heat and thus preheating the cold air. Due to the temperature difference between the upper and lower parts of the rotor during heating, a mushroom-shaped deformation occurs, increasing the gap between the upper fan-shaped plate and the rotor. This increased gap leads to increased leakage in the air preheater, resulting in greater energy loss. The air preheater fan-shaped plate leakage control system measures the distance between the rotor and a laser rangefinder and adjusts the gap between the upper fan-shaped plate and the rotor to ensure that this gap remains minimal under any operating condition, thereby reducing air leakage, achieving energy savings, and improving the overall unit efficiency.

[0003] like Figure 1 As shown, a laser rangefinder is fixed above the rotor. The left part of the dashed line represents the undeformed sector plate and rotor in the cold state, where the laser rangefinder measures the standard distance between the laser rangefinder and the rotor in the cold state. The right part of the dashed line represents the deformed rotor in the hot state, where the laser rangefinder measures the distance between the laser rangefinder and the deformed rotor. The laser rangefinder is fixed above the rotor 14, with the rotor angle steel reflector 11 contacting the upper surface of the rotor. A laser emitted by the laser emitter 6 penetrates the laser dustproof lens 12 and illuminates the rotor angle steel reflector 11 through the laser transmission channel 9, detecting the distance between the laser rangefinder and the rotor 14. By calculating the difference between the standard distance between the laser rangefinder and the rotor in the cold state and the distance between the laser rangefinder and the deformed rotor in the hot state, the deformation of the rotor is detected. The laser rangefinder is a new generation of distance measuring equipment, powerful, robust, and durable, designed specifically for the industrial measurement market. It can provide high-sensitivity, high-precision, and high-efficiency data acquisition for various measurement targets, thereby enabling non-contact, long-distance measurement of various parameters of the measured object.

[0004] The air preheater experiences high-temperature flue gas carrying a large amount of dust, creating a harsh working environment for the sector plate air leakage control system. Dust is ubiquitous, and the laser rangefinder used for this control system is directly exposed to the surrounding environment, frequently encountering high-temperature air leakage. Severe dust accumulation on the rangefinder probe surface leads to malfunctions of the laser emitting components due to high temperatures, causing system crashes. Dirty filters on the laser rangefinder's filter lens cause inaccurate measurement gap values, affecting the adjustment of the sector plate's sealing gap, increasing the air preheater's leakage rate, increasing the power consumption of the blower, and impacting boiler efficiency. As a high-precision component, the laser rangefinder's long-term operation in a high-temperature, dusty environment significantly shortens its lifespan, affecting the high-precision adjustment of the sector plate and resulting in high spare parts maintenance costs. Utility Model Content

[0005] To address the aforementioned issues, this application provides an air purging and cooling device based on a laser rangefinder. Through an oil-free screw air compressor, a first purging device, a second purging device, and a third purging device, it solves the problems of laser rangefinder malfunctions due to high temperatures and inaccurate measurement values.

[0006] To achieve the objectives of this application, the following technical solution is provided: This application provides an air-purging cooling device based on a laser rangefinder, wherein the laser rangefinder includes a laser emitter, a laser dustproof lens, a laser transmission channel, a rotor angle steel reflector, and a laser emitter protective cover; The air purging and cooling device is characterized by comprising: an oil-free screw air compressor, a first purging device, a second purging device, and a third purging device; The oil-free screw air compressor is connected to the first purging device, the second purging device, and the third purging device respectively; The first purging device is a rectangular box. A purging hole is opened from top to bottom on one end face of the first purging device. The laser emitter is set on the side of the first purging device with the purging hole. The second blowing device is an annular pipe. The second blowing device has blowing holes arranged around the upper surface of the annular pipe near the side of the laser dustproof lens. The second blowing device is located below the laser dustproof lens, and the laser dustproof lens is located outside one port of the laser transmission channel. The third purging device is an annular pipe. The third purging device has a purging hole on the side of the lower end face of the annular pipe close to the rotor angle steel reflector. The third purging device is located above the rotor angle steel reflector. The rotor angle steel reflector is located outside the other port of the laser transmission channel.

[0007] Furthermore, the first purging device is 15cm high and 2cm long and wide. Eight purging holes, each 3mm in diameter, are opened on the end face of the first purging device near the laser emitter. The air purging angle of the first purging device covers the laser emitter. The second and third purging devices are annular pipes made of stainless steel tubing with a diameter of 8mm. Ten purging holes, each 2mm in diameter, are evenly designed along the circumference of the annular pipes on the upper and lower ends. The second and third purging devices are designed with a purging angle.

[0008] Furthermore, the oil-free screw air compressor is equipped with an oil and water removal device at the output compressed air end, and the oil and water removal device is connected between the oil-free screw air compressor and the first purging device, the second purging device and the third purging device respectively.

[0009] Furthermore, the diameters of the second and third blowing devices are designed according to the laser transmission channel, and they are respectively fixed to the inner wall of the laser transmission channel by welding; the second blowing device is located 5cm below the laser dustproof lens; the third blowing device is located 5cm above the rotor angle steel reflector.

[0010] Furthermore, the oil and water removal device is connected to the input end of the main pipeline, the output end of the main pipeline is connected to the input ends of the first pipeline, the second pipeline and the third pipeline, the output end of the first pipeline is connected to the first purging device, the output end of the second pipeline is connected to the second purging device, and the output end of the third pipeline is connected to the third purging device. Furthermore, a main shut-off valve is installed on the main pipeline, a first purge valve is installed on the first pipeline, and a third purge valve is installed on the third pipeline.

[0011] Furthermore, the first purging device and the laser emitter are disposed inside the laser emitter protective cover, and the laser emitter protective cover has holes, through which the third pipe is connected to the first purging device.

[0012] The air purging and cooling device based on a laser rangefinder provided in this application generates compressed air using a screw-type air compressor. This compressed air enters a first, second, and third purging device. The first purging device purifies and cools the laser emitter, while the second and third purging devices respectively purge dust from the laser dustproof lens and the rotor angle steel reflector. This air purging and cooling device ensures the laser emitter operates stably within a suitable temperature range, and keeps the laser dustproof lens and rotor angle steel reflector clean and free from contamination, improving laser transmission throughput and reflection reception rate, and guaranteeing the stability and accuracy of laser ranging. Attached Figure Description

[0013] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. Figure 1 A schematic diagram showing the comparison of the positions of the fan-shaped plate and the rotor in cold and hot states, and the distance between the fan-shaped plate and the rotor measured by a laser rangefinder; Figure 2 A schematic diagram of the structure of the air purging and cooling device based on a laser rangefinder provided in the embodiments of this application; Figure 3 for Figure 1 A front view of the first purging device; Figure 4 for Figure 1 A front view of the first and second purging devices; Illustrations: 1. Oil and water removal device; 2. Main shut-off valve; 3. First purge valve; 4. Third purge valve; 5. First purge device; 6. Laser emitter; 7. Laser emitter protective cover; 8. Second purge device; 9. Laser transmission channel; 10. Third purge device; 11. Rotor angle steel reflector; 12. Laser dustproof lens; 13. Oil-free screw air compressor; 14. Sector plate; 15. Rotor. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0016] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0017] Figure 1 A schematic diagram showing the position comparison between the cold and hot states of the sector plate 14 and the rotor 15, and the distance between the sector plate 14 and the rotor 15 measured by a laser rangefinder; Figure 2 A schematic diagram of the structure of the air purging and cooling device based on a laser rangefinder provided in the embodiments of this application; Figure 3 for Figure 2 Front view of the first purging device 5; Figure 4 for Figure 2 A front view of the first purging device 5 and the second purging device 8. The following is a combined view... Figures 2 to 3 The following embodiments illustrate the technical solutions of this application.

[0018] like Figures 2-3 As shown, this application embodiment provides an air-purifying cooling device based on a laser rangefinder. The laser rangefinder includes a laser emitter 6, a laser dustproof lens 12, a laser transmission channel 9, a rotor angle steel reflector 11, and a laser emitter protective cover 7. The working principle of the laser rangefinder is as follows: The laser emitter 6 generates a highly collimated, narrow-wavelength light wave. The light wave passes through the laser dustproof lens 12 and enters the laser transmission channel 9, ensuring that the light wave is focused and propagates along a predetermined direction. The rotor angle steel reflector 11 provides the function of receiving and reflecting the light wave from the laser emitter 6. The light wave is reflected and scans the target area, achieving dynamic ranging.

[0019] Specifically, the air purging and cooling device includes: an oil-free screw air compressor 13, a first purging device 5, a second purging device 8, and a third purging device 10. The oil-free screw air compressor 1 is an integrated unit and is connected to the first purging device 5, the second purging device 8, and the third purging device 10. The first purging device 5 is a rectangular box with purging holes on one side from top to bottom. A laser emitter 6 is installed on the side of the first purging device 5 with the purging holes. The second purging device 8 is an annular pipe with purging holes arranged around its upper annular surface near the laser dustproof lens 12. The second purging device 8 is located below the laser dustproof lens 12, which is located outside one port of the laser transmission channel 9. The second purging device 8 is an upward-directed dust removal device for the laser dustproof lens 12. The third purging device 10 is an annular pipe. The third purging device 10 has a purging hole on the side of the lower end face of the annular pipe close to the rotor angle steel reflector plate 11. The third purging device 10 is located above the rotor angle steel reflector plate 11. The rotor angle steel reflector plate 11 is located outside the other port of the laser transmission channel 9. The third purging device 10 is a downward dedicated dust removal device for the rotor angle steel reflector plate 11.

[0020] The air purging and cooling device provided in this embodiment works as follows: After air enters the unit, it is compressed by the oil-free screw air compressor 13 to form compressed air. The compressed air enters the laser rangefinder and continuously purifies and cools the laser emitter 6 through the purging holes of the first purging device 5, ensuring that the laser emitter 6 operates within a suitable temperature range for a long time, reducing the failure rate and extending its service life. The compressed air purifies and removes dust from the laser dustproof lens 12 through the purging holes of the second purging device 8, and removes dust from the rotor angle steel reflector 11 through the purging holes of the third purging and dust removal device 10, ensuring the necessary cleanliness of the laser dustproof lens 12 and the rotor angle steel reflector 11. By improving the laser transmittance and reflectivity, the accuracy of laser ranging is ensured, ultimately making the distance measurement value between the laser rangefinder and the rotor 15 accurate.

[0021] In one embodiment, the first purging device 5 is 15cm high and 2cm long and wide. Eight purging holes are opened on the side end face of the first purging device 5 near the laser emitter 6. Each purging hole has a diameter of 3mm. The air purging angle of the first purging device 5 covers the body of the laser emitter 6. The second purging device 8 and the third purging device 10 are annular pipes made of stainless steel round tubes with a diameter of 8mm. Ten purging holes are evenly designed along the circumference of the annular pipes at the upper end face and the lower end face, respectively. Each purging hole has a diameter of 2mm. The second purging device 8 and the third purging device 10 are designed with a purging angle.

[0022] Specifically, the first purging device 5 is a rectangular box, the size of which matches the laser emitter 6. Eight purging holes are opened on the surface of the first purging device 5 to ensure that the purging air angle covers the laser sensor 6 body, enabling overall purging and cooling of the laser sensor 6. The second purging device 8 and the third purging device 10 use stainless steel 8mm diameter round tubes in a ring-shaped configuration. The stainless steel round tubes are high-temperature resistant and durable, requiring no frequent replacement. The small 8mm diameter, combined with the smooth inner wall of the stainless steel, reduces frictional resistance, maintains airflow efficiency, and facilitates the construction of a ring-shaped pipe. Depending on the location, ten purging holes are evenly designed along the circumference of the ring-shaped pipe on either the upper or lower end face, with purging angles set to ensure that the laser dustproof lens 12 and the rotor angle steel reflector 11 can be purged from all directions and at multiple angles, ensuring that the end faces of the laser dustproof lens 12 and the rotor angle steel reflector 11 are clean and uncontaminated, improving the accuracy of laser ranging data.

[0023] In one embodiment, an oil-free screw air compressor 13 is equipped with an oil and water removal device 1 at its compressed air output end. The oil-free screw air compressor 13 is connected to the first purging device 5, the second purging device 8, and the third purging device 10, respectively, and the oil and water removal device 1 is connected between them. By setting the oil and water removal device 1 to remove oil and water from the compressed air, dry and clean compressed air is obtained.

[0024] In one embodiment, the diameters of the second purging device 8 and the third purging device 10 are designed according to the laser transmission channel 9 and are respectively fixed to the inner wall of the laser transmission channel 9 by welding; the second purging device 8 is located 5cm below the laser dustproof lens 12; the third purging device 10 is located 5cm above the rotor angle steel reflector 11.

[0025] Specifically, the diameters of the annular pipes of the second and third blowing devices 8 and 10 are designed according to the diameter of the laser transmission channel 9, ensuring that the second and third blowing devices 8 and 10 can fit tightly against the inner wall of the laser transmission channel 9. The second and third blowing devices 8 and 10 are fixed to the inner wall of the laser transmission channel 9 by welding. The second and third blowing devices 8 and 10 are respectively positioned 5cm below the laser dustproof lens 12 and 5cm above the rotor angle steel reflector 11. Experiments were conducted to observe the dust removal effect of the blowing devices and whether secondary pollution was generated. An appropriate distance allows the airflow to diffuse, evenly covering the dust removal area and improving overall dust removal efficiency. Through multiple experiments, the optimal distance for installing the blowing devices at 5cm was determined. A reasonable distance balances the blowing force and dust removal effect, reduces secondary pollution, and improves cleaning efficiency.

[0026] In one embodiment, the oil and water removal device 1 is connected to the input end of the main pipeline. The output end of the main pipeline is connected to the input ends of the first, second, and third pipelines. The output end of the first pipeline is connected to the first purging device 5, the output end of the second pipeline is connected to the second purging device 8, and the output end of the third pipeline is connected to the third purging device 10. The main pipeline output end has three pipelines connected to the first purging device 5, the second purging device 8, and the third purging device 10, respectively, which can meet the compressed air flow requirements of different devices.

[0027] In one embodiment, a main shut-off valve 2 is provided on the main pipeline, a first purge valve 3 is provided on the first pipeline, and a third purge valve 4 is provided on the third pipeline.

[0028] Specifically, the main shut-off valve 2 controls the flow of compressed air into the laser rangefinder. The opening and closing of the first purge valve 3 are adjusted according to temperature to control the pressure and flow rate of the compressed air entering the first purge device 5. By adjusting the pressure and flow rate, the laser emitter 6 is continuously purged and cooled, ensuring it operates within a suitable temperature range, maximizing its performance and extending its service life. The opening and closing of the third purge valve 4 are adjusted according to temperature, and the pressure and flow rate are controlled to continuously remove dust from the laser dustproof lens 12 and the rotor angle steel reflector 11, ensuring clean and uncontaminated end faces. This significantly improves the throughput of the laser transmission channel and ensures the accuracy of the sector plate gap measurement data.

[0029] In one embodiment, the first purging device 5 and the laser emitter 6 are disposed inside the laser emitter protective cover 7, and the laser emitter protective cover 7 has holes through which the third pipe is connected to the first purging device 5.

[0030] Specifically, the laser emitter protective cover 7 provides a sealed protection, effectively preventing dust and splashes from contaminating the laser emitter 6, protecting the laser emitter 6 from mechanical damage, maintaining the operational stability of the laser emitter 6, and improving safety. The first purging device 5 is placed inside the laser emitter protective cover 7, with holes made in the laser emitter protective cover 7. The first purging device 5 is connected to a first pipe to input compressed air to purge and cool the laser emitter 6.

[0031] The beneficial effects achievable by the embodiments of this application are as follows: Compressed air, after being treated to remove oil and water, can be used as a power source. This application designs an embedded circular purging device that matches the fan-shaped laser transmission channel 9, and a rectangular cooling device that conforms to the size of the laser emitter. These components completely cover the working space of the laser emitter 6, ensuring that the laser emitter 6 operates stably and continuously within a suitable temperature range. Furthermore, the laser dustproof lens 12 and the rotor angle steel reflector 11 remain clean and uncontaminated, improving the laser transmission throughput and reflection reception rate, and ensuring the stability and accuracy of laser ranging. This application has a simple structure, is easy to implement, has a small opening diameter for the purging device, uses a suitable number of openings, consumes less energy, and has a significant effect. It reduces the repetitive workload of manually wiping the dustproof lens periodically, reduces system errors, and ensures measurement accuracy.

[0032] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. An air-purging cooling device based on a laser rangefinder, wherein the laser rangefinder includes a laser emitter, a laser dustproof lens, a laser transmission channel, a rotor angle steel reflector, and a laser emitter protective cover; Its features are, The air purging and cooling system includes: an oil-free screw air compressor, a first purging device, a second purging device, and a third purging device; The oil-free screw air compressor is connected to the first purging device, the second purging device, and the third purging device respectively; The first purging device is a rectangular box. A purging hole is opened from top to bottom on one end face of the first purging device. The laser emitter is set on the side of the first purging device with the purging hole. The second blowing device is an annular pipe. The second blowing device has blowing holes arranged around the upper surface of the annular pipe near the side of the laser dustproof lens. The second blowing device is located below the laser dustproof lens, and the laser dustproof lens is located outside one port of the laser transmission channel. The third purging device is an annular pipe. The third purging device has a purging hole on the side of the lower end face of the annular pipe close to the rotor angle steel reflector. The third purging device is located above the rotor angle steel reflector. The rotor angle steel reflector is located outside the other port of the laser transmission channel.

2. The air-purging cooling device based on a laser rangefinder according to claim 1, characterized in that, The first purging device is 15cm high and 2cm long and wide. It has 8 purging holes on the side face near the laser emitter, each with a diameter of 3mm. The purging angle of the first purging device covers the laser emitter. The second and third purging devices are annular pipes made of stainless steel round tubes with a diameter of 8mm. The annular pipes have 10 purging holes evenly designed along the circumference of the upper and lower ends, each with a diameter of 2mm. The second and third purging devices are designed with a purging angle.

3. The air-purging cooling device based on a laser rangefinder according to claim 1, characterized in that, The oil-free screw air compressor is equipped with an oil and water removal device at the output compressed air end. The oil-free screw air compressor is connected to the first purging device, the second purging device and the third purging device respectively.

4. The air-purging cooling device based on a laser rangefinder according to claim 2, characterized in that, The diameters of the second and third purging devices are designed according to the laser transmission channel, and they are respectively fixed to the inner wall of the laser transmission channel by welding; the second purging device is located 5cm below the laser dustproof lens; the third purging device is located 5cm above the rotor angle steel reflector.

5. The air-purging cooling device based on a laser rangefinder according to claim 3, characterized in that, The oil and water removal device is connected to the input end of the main pipeline. The output end of the main pipeline is connected to the input ends of the first, second, and third pipelines. The output end of the first pipeline is connected to the first purging device, the output end of the second pipeline is connected to the second purging device, and the output end of the third pipeline is connected to the third purging device.

6. The air-purging cooling device based on a laser rangefinder according to claim 5, characterized in that, A main shut-off valve is installed on the main pipeline, a first purge valve is installed on the first pipeline, and a third purge valve is installed on the third pipeline.

7. The air-purging cooling device based on a laser rangefinder according to claim 5, characterized in that, The first purging device and the laser emitter are disposed inside the laser emitter protective cover. The laser emitter protective cover has holes, and the third pipe is connected to the first purging device through the holes.

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