Dust removal, defrosting and ventilation device

Abstract

The present application provides a dust removal, defrosting and ventilation device, belonging to the technical field of ventilation equipment. In this device, for the ventilation unit, by connecting the blower therein to the through holes on the bottom plate of the dust removal and defrosting unit, it is convenient to introduce air from the through holes to the heat exchanger. The hot air flowing out of the heat exchanger is divided into two parts. One part is discharged through the hot air outlet, and the other part flows to the hot air ring under the control of the valve group and then is discharged through the hot air column. For the dust removal and defrosting unit, by arranging at least two hot air columns on the outside of the bird-proof net, and there are a plurality of hot air holes on the hot air columns, the hot air discharged from the hot air holes can disperse the dirt accumulated on the bird-proof net and melt the ice and frost frozen on the bird-proof net, so as to keep the bird-proof net clean and transparent. After using the above device, there is no need to manually clean the bird-proof net, which reduces the labor intensity of the operators, reduces the labor difficulty of the operators, and eliminates the safety hazards brought by manually removing dust and defrosting the bird-proof net.

Description

Technical Field

[0001] This application relates to the technical field of ventilation equipment, and particularly to a dust removal and defrosting ventilation device. Background Art

[0002] During the production processes of oil refining and chemical industries, industrial and mining enterprises, sufficient oxygen is required for the breathing of operating personnel and the operation of heating furnaces. Therefore, natural ventilation or compressed air is needed to ventilate and supply oxygen to the production site. To ensure the smooth flow of the air ducts of natural ventilation or compressors, ventilation openings are provided on the walls of the production site or on the compressors. To prevent animals such as birds or other sundries from entering the production site or the interior of the compressor through the ventilation openings, anti-bird nets are usually installed on the ventilation openings.

[0003] However, during long-term use, anti-bird nets are prone to accumulating dust and forming dirt, which can clog the mesh holes. Moreover, during winter production, due to low temperatures and humid air, the anti-bird nets are prone to icing or frosting, which can also clog the mesh holes, resulting in poor ventilation. Insufficient oxygen in coal mining enterprises or underground operating personnel can affect the physical health of the operating personnel; insufficient air volume in the heating furnace can cause too low an excess air coefficient, low thermal efficiency, high energy consumption, and in severe cases, cause the heating furnace to trip and stop, unable to produce continuously. Therefore, it is necessary to regularly remove dust and frost from the anti-bird nets to ensure the ventilation effect of the ventilation openings.

[0004] Currently, manual methods are usually used for dust removal and defrosting. Since the anti-bird nets at the inlets of natural ventilation or compressed air ducts are generally installed at a height of 3 to 5 meters from the ground, manual labor can only use ladders, platforms, or long stick-like tools for dust removal and defrosting. The frequency of dust removal and defrosting is high, the labor intensity during manual cleaning is large, the difficulty is relatively high, and there are serious safety hazards during operation. Summary of the Invention

[0005] The embodiments of this application provide a dust removal and defrosting ventilation device, which can reduce the labor intensity of operating personnel, lower the labor difficulty of operating personnel, and eliminate the safety hazards brought by manual dust removal and defrosting of anti-bird nets. The technical solution is as follows:

[0006] A dust removal and defrosting ventilation device is provided, which includes: a dust removal and defrosting unit and a ventilation unit;

[0007] The dust removal and defrosting unit includes: an anti-bird net, a hot air ring, a fixed ring, at least two hot air columns, a bottom plate, and a cover plate;

[0008] The anti-bird net is a cylinder surrounded by a metal mesh and is connected to the inner sides of the hot air ring and the fixed ring;

[0009] The hot air column is cylindrical, and there are multiple hot air holes on the wall of the hot air column. At least two such hot air columns are connected between the hot air ring and the fixed ring and are located outside the anti-bird net. The inner cavity of the hot air ring is communicated with the inner cavity of the hot air column;

[0010] The bottom plate is connected to the inner wall of the hot air ring, and there are through holes on the bottom plate;

[0011] The cover plate is installed on the top of the fixed ring;

[0012] The ventilation unit includes: multiple sections of ventilation pipes, a blower, a heat exchanger, and a valve group. The through hole on the bottom plate, the blower, the heat exchanger, and the valve group are sequentially communicated through the multiple sections of ventilation pipes. There is also a hot air outlet on a section of the ventilation pipe between the heat exchanger and the valve group.

[0013] In a possible design, both ends of the hot air column are connected to the hot air ring and the fixed ring through bearings respectively.

[0014] In a possible design, there is a first O-ring seal between the outer ring of the bearing and the wall of the blind hole, and a second O-ring seal between the inner ring of the bearing and the hot air column.

[0015] In a possible design, the bottom plate is funnel-shaped, and the through hole is located at the center of the bottom of the bottom plate.

[0016] In a possible design, the cover plate is umbrella-shaped.

[0017] In a possible design, the cover plate is installed on the top of the fixed ring through at least two connecting columns;

[0018] There is a preset distance between any two adjacent connecting columns.

[0019] In a possible design, the valve group includes: a first manual valve, a solenoid valve, a second manual valve, and a third manual valve;

[0020] The first manual valve, the solenoid valve, and the second manual valve are sequentially connected and are in parallel with the third manual valve.

[0021] In a possible design, the device further includes a control unit;

[0022] The control unit is connected to the solenoid valve through an optical cable.

[0023] In a possible design, the control unit is connected to the blower and the heat exchanger through optical cables.

[0024] In a possible design, the device further includes: an induced draft fan for drawing air for the heating furnace.

[0025] In a possible design, the device further includes: an induced draft pipe;

[0026] The air draft pipe passes through the heat exchanger and is connected to the air draft fan.

[0027] In a possible design, the device further includes: a plurality of valve bodies. Among them, the first valve body is installed on a section of the ventilation pipe between the through hole on the bottom plate and the blower, and the second valve body is installed at the hot air outlet or on a section of the ventilation pipe led out from the hot air outlet.

[0028] For the ventilation unit of the device provided by the embodiments of the present application, by connecting the blower in it to the through hole on the bottom plate of the dust removal and defrosting unit, the blower can be used to draw air from the through hole to the heat exchanger. The hot air flowing out of the heat exchanger is divided into two parts. One part is discharged through the hot air outlet, and the other part flows to the hot air ring of the dust removal and defrosting unit under the control of the valve group and then is discharged through the hot air column. For the dust removal and defrosting unit, by arranging at least two hot air columns outside the anti-bird net, and there are a plurality of hot air holes on the hot air columns. The hot air discharged from the hot air holes can blow away the dust and dirt accumulated on the anti-bird net and melt the ice and frost frozen on the anti-bird net, so as to keep the anti-bird net clean and transparent. The above device has the functions of dust removal, defrosting and ventilation. After using the above device, there is no need to manually clean the anti-bird net, which reduces the labor intensity of the operators, reduces the labor difficulty of the operators, and eliminates the safety hazards caused by manually removing dust and defrosting the anti-bird net. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of a dust removal, defrosting and ventilation device provided by the embodiments of the present application;

[0031] Figure 2 It is a schematic structural diagram of the dust removal and defrosting unit 1 in a dust removal, defrosting and ventilation device provided by the embodiments of the present application.

[0032] The reference numerals of the parts in the drawings are described as follows:

[0033] 1 - Dust removal and defrosting unit;

[0034] 11 - Hot air ring;

[0035] 12 - Fixed ring;

[0036] 13 - Hot air column;

[0037] 131 - Hot air hole;

[0038] 14 - Bottom plate;

[0039] 15 - Cover plate;

[0040] 2 - Ventilation unit;

[0041] 21 - Ventilation pipe;

[0042] 211 - Hot air outlet;

[0043] 22 - Blower;

[0044] 23 - Heat exchanger;

[0045] 24 - Valve group;

[0046] 241 - First manual valve;

[0047] 242 - Solenoid valve;

[0048] 243 - Second manual valve;

[0049] 244 - Third manual valve;

[0050] 3 - Control unit;

[0051] 4 - Induced draft fan;

[0052] 5 - Induced draft pipe;

[0053] 6 - Valve body;

[0054] 61 - First valve body;

[0055] 62 - Second valve body. Detailed implementation manners

[0056] To make the objectives, technical solutions and advantages of this application clearer, the following will further describe the implementation manners of this application in detail with reference to the accompanying drawings.

[0057] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] Figure 1 It is a structural schematic diagram of a dust removal, defrosting and ventilation device provided by an embodiment of this application. Please refer to Figure 1, the device includes: a dust and frost removal unit 1 and a ventilation unit 2; the dust and frost removal unit 1 includes: a bird-proof net, a hot air ring 11, a fixing ring 12, at least two hot air columns 13, a bottom plate 14 and a cover plate 15; the bird-proof net is a cylinder formed by enclosing a metal net, and is connected to the inner sides of the hot air ring 11 and the fixing ring 12; the hot air column 13 is cylindrical, and a plurality of hot air holes 131 are provided on the wall of the hot air column 13. At least two hot air columns 13 are connected between the hot air ring 11 and the fixing ring 12 and are located outside the bird-proof net, and the inner cavities of the hot air ring 11 and the hot air column 13 are communicated; the bottom plate 14 is connected to the inner wall of the hot air ring 11, and the bottom plate 14 has through holes; the cover plate 15 is installed on the top of the fixing ring 12; the ventilation unit 2 includes: multiple sections of ventilation pipes 21, a blower 22, a heat exchanger 23 and a valve group 24. The through holes on the bottom plate 14, the blower 22, the heat exchanger 23 and the valve group 24 are sequentially communicated through the multiple sections of ventilation pipes 21, and a hot air outlet 211 is further provided on a section of the ventilation pipe 21 between the heat exchanger 23 and the valve group 24.

[0059] The working principle of the device is described in detail below:

[0060] In this device, the bird-proof net can be fixed on the wall of the production site or the ventilation opening of the compressor through the hot air ring 11, or can be fixed at the inlet of any industrial process pipeline. At least two hot air columns 13 are fixed on the hot air ring 11 to form a ring, so as to be located outside the bird-proof net, so as to use the hot air flowing out of the hot air columns 13 to clean the bird-proof net.

[0061] For the ventilation unit 2 of the device provided by the embodiment of the present application, by connecting the blower 22 therein to the through holes on the bottom plate 14 of the dust and frost removal unit 1, the blower 22 can be used to draw air from the through holes to the heat exchanger 23. The hot air flowing out of the heat exchanger 23 is divided into two parts. One part is discharged through the hot air outlet 211, and the other part flows to the hot air ring 11 of the dust and frost removal unit 1 under the control of the valve group 24, and then is discharged through the hot air columns 13. For the dust and frost removal unit 1, by arranging at least two hot air columns 13 outside the bird-proof net, and a plurality of hot air holes 131 are provided on the hot air columns 13, the hot air discharged from the hot air holes 131 can blow away the dirt accumulated on the bird-proof net and melt the frozen ice and frost on the bird-proof net, so as to keep the bird-proof net clean and transparent. The above device has the functions of dust and frost removal and ventilation. After using the above device, there is no need to manually clean the bird-proof net, which reduces the labor intensity of the operators, reduces the labor difficulty of the operators, and eliminates the safety hazards caused by manually removing dust and frost from the bird-proof net.

[0062] Compared with manual dust and frost removal and steam dust and frost removal, this device not only saves production costs, but also greatly reduces the labor intensity of on-site operators, avoids potential safety hazards, and can be used for dust and frost removal at the air inlets of various equipment and vehicles. This device uses hot air to simultaneously remove dust and frost, saving energy and having a relatively low cost, ensuring that the device can operate stably for a long period.

[0063] The structure and working principle of each part of this device will be described in detail below:

[0064] In the dust and frost removal unit 1, the material of the bird-proof net can be a stainless steel mesh, and the mesh size can be set according to the on-site dust prevention requirements. For example, if the dust prevention requirement is low, a stainless steel mesh with a larger mesh size can be selected to make the bird-proof net, so as to improve the air permeability of the bird-proof net while using it to prevent birds and foreign objects, and at the same time reduce the possibility of scaling and frosting on the bird-proof net. Since the bird-proof net is cylindrical, the bending radian thereof is adapted to the radians of the hot air ring 11 and the fixing ring 12.

[0065] In the dust and frost removal unit 1, the bottom of the hot air ring 11 can be fixedly connected to the bottom plate 14, for example, by welding, so as to have a relatively high connection strength. The interior of the hot air ring 11 has a cavity, an air inlet on the side, and a plurality of air outlets on the top, and each air outlet communicates with a hot air column 13, thereby providing a flow channel for the hot air.

[0066] In the dust and frost removal unit 1, the fixing ring 12 is annular, and the fixing ring 12 and the bird-proof net can be fixedly connected, thereby improving the firmness of the dust and frost removal unit 1. Among them, there are various ways of fixed connection, such as welding, and this embodiment does not limit this.

[0067] There is no opening at the position where the fixing ring 12 is connected to the hot air column 13. Therefore, one end of the hot air column 13 connected to the fixing ring 12 is in a blocked state, so that the hot air in the hot air column 13 can only be discharged through the hot air holes 131 on its side. The hot air discharged from the hot air holes 131 facing the bird-proof net flows onto the bird-proof net, so as to blow away the dust and dirt accumulated on the bird-proof net and melt the frozen ice and frost on the bird-proof net, thereby keeping the bird-proof net clean and transparent.

[0068] Since the dust removal and defrosting unit 1 has a ventilation function, there is a certain distance between the hot air columns 13 arranged in a ring, so that the external air can pass through the gaps between the hot air columns 13 and the mesh holes of the bird-proof net, and then flow into the production site or the compressor. Therefore, the bottom plate 14 is connected to the blower 22 through a through hole, and based on the suction provided by the blower 22, the air outside the device is sucked into the production site or the compressor. The number of the hot air columns 13 of the device can be set according to actual needs. For example, the number of the hot air columns 13 can be 3 - 20, and this embodiment does not limit this.

[0069] In the device, the bottom plate 14 and the adjacent ventilation pipe 21 can be connected by welding, so as to have high strength and not be easily damaged.

[0070] The function of the cover plate 15 is to prevent sundries such as fallen leaves and dust from falling into the space inside the bird-proof net, so as to keep the bird-proof net clean as much as possible and avoid scaling.

[0071] Figure 2 It is a schematic structural diagram of the dust removal and defrosting unit 1 in a dust removal, defrosting and ventilation device provided by an embodiment of the present application. Only part of the structure of the dust removal and defrosting unit 1 is shown in this figure. Please refer to Figure 2 In a possible design, both ends of the hot air column 13 are respectively connected to the hot air ring 11 and the fixed ring 12 through bearings. Specifically, blind holes are provided on the hot air ring 11 and the fixed ring 12, and each bearing is fixed in a blind hole. The outer ring of the bearing is fixedly connected to the wall of the blind hole, and the inner ring is connected to the hot air column 13. Since the outer ring and the inner ring of the bearing can rotate relative to each other, the hot air column 13 can rotate relative to the hot air ring 11 and the fixed ring 12, so as to better clean the bird-proof net.

[0072] In a possible design, there is a first O-ring seal between the outer ring of the bearing and the wall of the blind hole, and a second O-ring seal between the inner ring of the bearing and the hot air column 13 for sealing.

[0073] In a possible design, the bottom plate 14 is funnel-shaped, and the through hole is located at the center of the bottom of the bottom plate 14. The shape of the bottom plate 14 is beneficial to the flow of gas, so as to improve the working efficiency of the device.

[0074] In a possible design, the cover plate 15 is umbrella-shaped, so as to avoid dust accumulation or rainwater accumulation on the top of the cover plate 15.

[0075] In a possible design, the cover plate 15 is covered on the top of the fixed ring 12 through at least two connecting columns; there is a preset distance between any two adjacent connecting columns.

[0076] In the above structure, based on at least two connecting columns, there is a certain distance between the cover plate 15 and the fixed ring 12. Since there is also a preset distance between any two adjacent connecting columns, a ventilated space is formed based on the distance between the cover plate 15 and the fixed ring 12, facilitating the dust removal, defrosting, and ventilation device to play a ventilation role.

[0077] The number of connecting columns of the device can be set according to actual needs. For example, the number of connecting columns can be 3 - 20, and this embodiment does not limit this.

[0078] In the ventilation unit 2, the blower 22 is a device that generates negative pressure through the rotation of the impeller and then extracts air from the system. The blower 22 and the adjacent two sections of ventilation pipes 21 can be connected by flanges, which are firmly connected and convenient for disassembly and installation.

[0079] In the ventilation unit 2, the heat exchanger 23 is a device that transfers part of the heat of the hot fluid to the cold fluid, also known as a heat exchanger. The heat exchanger 23 plays an important role in many industrial productions such as chemical industry, petroleum, power, food, etc. The heat of the heat exchanger 23 can come from the heating furnace in the production site, that is, the heat exchanger 23 is used to transfer part of the heat of the hot fluid output from the heating furnace, and this embodiment does not limit this.

[0080] In a possible design, the valve group 24 includes: a first manual valve 241, a solenoid valve 242, a second manual valve 243, and a third manual valve 244; the first manual valve 241, the solenoid valve 242, and the second manual valve 243 are connected in sequence and are in parallel with the third manual valve 244.

[0081] Among them, the solenoid valve 242 is an industrial device controlled by electricity. It is a basic automation component used to control fluids and belongs to an actuator. It is not limited to being driven by hydraulic or pneumatic means. The solenoid valve 242 can be used in industrial control systems to adjust the direction, flow rate, speed, and other parameters of the medium. The solenoid valve 242 can cooperate with different circuits to achieve the expected control, and both the control accuracy and flexibility can be guaranteed.

[0082] In the above structure, the control personnel can remotely control the solenoid valve 242 based on the circuit, thereby controlling the flow rate of the fluid in the corresponding ventilation pipe 21, where the fluid can be air.

[0083] For manual valves, they can be operated manually by means of a handwheel, handle, lever, sprocket, etc. When the valve opening and closing torque is large, a gear or worm gear reducer can be set between the handwheel and the valve stem. When necessary, a universal joint and a transmission shaft can also be used for remote operation.

[0084] The first manual valve 241 and the second manual valve 243 are used for backup purposes. When the solenoid valve 242 fails, the control personnel can perform manual control based on the first manual valve 241 and the second manual valve 243, thereby preventing the air in the ventilation pipe 21 from stopping flowing.

[0085] Further, in the above structure, the third manual valve 244 also serves as a backup. When the first manual valve 241, the solenoid valve 242, and the second manual valve 243 all fail, the control personnel can perform manual control based on the first manual valve 241 and the second manual valve 243, thereby preventing the air in the ventilation pipe 21 from stopping flowing.

[0086] In a possible design, the device further includes a control unit 3; the control unit 3 is connected to the solenoid valve 242 through an optical cable, so as to automatically control the opening and closing, opening degree, etc. of the solenoid valve 242. Further, the control unit includes a programmable logic controller or a computer device, and automatically controls the opening and closing, opening degree, etc. of the solenoid valve 242 through a pre-set program.

[0087] In a possible design, the control unit 3 is connected to the blower 22 and the heat exchanger 23 through optical cables.

[0088] Based on the above mechanism, the control unit 3 can control the opening and closing and the air volume of the blower 22, and can also control the start and stop of the heat exchanger 23.

[0089] In a possible design, the device further includes: an induced draft fan 4 for drawing air for the heating furnace. Among them, the induced draft fan 4 is a device that generates negative pressure by the rotation of the impeller and then extracts air from the system. The heating furnace can be a device that provides heat source for the heat exchanger 23. At the same time, the heating furnace is also used to provide heat source for other equipment in industrial production. The induced draft fan 4 draws air for the heating furnace, which can increase the amount of oxygen obtained by the heating furnace, is conducive to accelerating the combustion process of the fuel in the heating furnace, and improves the combustion efficiency of the heating furnace.

[0090] In a possible design, the device further includes: an induced air pipe 5; the induced air pipe 5 passes through the heat exchanger 23 and is connected to the induced draft fan 4.

[0091] Based on the above structure, the air in the induced air pipe 5 is heated by the heat exchanger 23, so that the device can be used to provide heated hot air for the heating furnace, thereby further improving the combustion efficiency of the heating furnace.

[0092] In a possible design, the device further includes: a plurality of valve bodies 6. Among them, the first valve body 61 is installed on a section of the ventilation pipe 21 between the through hole on the bottom plate 14 and the blower 22, and is used to control whether air can flow through this section of the ventilation pipe 21.

[0093] The second valve body 62 is installed at the hot air outlet 211 or on a section of the ventilation pipe 21 led out from the hot air outlet 211, and is used to control whether air can flow in this section of the ventilation pipe 21.

[0094] All the above optional technical solutions can be combined arbitrarily to form optional embodiments of the present application, which will not be elaborated one by one here.

[0095] Based on the above device, air enters the anti-bird net from the outside of the anti-bird net, passes through the through holes on the bottom plate 14, passes through a section of the ventilation pipe 21, is sucked by the blower 22, and then flows through the heat exchanger 23. After being heated in the heat exchanger 23, a part of the hot air is discharged through the hot air outlet 211, and the other part flows to the hot air ring 11 of the dust removal and defrosting unit 1 under the control of the valve group 24, and then is discharged through the hot air column 13, blowing away the dust and dirt accumulated on the anti-bird net and melting the ice and frost frozen on the anti-bird net.

[0096] For the ventilation unit 2 of the device provided in the embodiment of the present application, by connecting the blower 22 therein to the through holes on the bottom plate 14 of the dust removal and defrosting unit 1, the blower 22 can be used to draw air from the through holes to the heat exchanger 23. The hot air flowing out of the heat exchanger 23 is divided into two parts. One part is discharged through the hot air outlet 211, and the other part flows to the hot air ring 11 of the dust removal and defrosting unit 1 under the control of the valve group 24, and then is discharged through the hot air column 13. For the dust removal and defrosting unit 1, by arranging at least two hot air columns 13 on the outside of the anti-bird net, and a plurality of hot air holes 131 are provided on the hot air columns 13, the hot air discharged from the hot air holes 131 can blow away the dust and dirt accumulated on the anti-bird net and melt the ice and frost frozen on the anti-bird net, so as to keep the anti-bird net clean and transparent, and further ensure the physical health of the operators and ensure the normal continuous production of the heating furnace.

[0097] Compared with manual dust removal and defrosting and steam dust removal and defrosting, the device not only saves production costs, but also greatly reduces the labor intensity of on-site operators, avoids potential safety hazards, and can be used for dust removal and defrosting of the air inlets of various equipment and vehicles. The device uses hot air for both dust removal and defrosting, saves energy and has low costs, and can ensure the long-term stable operation of the device.

[0098] In a possible design, the device further includes a control unit 3; the control unit 3 is connected to the solenoid valve 242 through an optical cable, so as to automatically control the opening and closing and the opening degree of the solenoid valve 242. Further, the control unit includes a programmable logic controller or a computer device, and automatically controls the opening and closing and the opening degree of the solenoid valve 242 through a pre-set program.

[0099] In a possible design, the control unit 3 is connected to both the blower 22 and the heat exchanger 23 through optical cables. Based on the above mechanism, the control unit 3 can control the opening and closing of the blower 22, the air volume of the blower, etc., and can also control the start and stop of the heat exchanger 23, etc.

[0100] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dust removal and defrosting ventilation device, characterized in that, the device includes: a dust removal and defrosting unit (1), a ventilation unit (2), a draft fan (4) and a draft tube (5); the dust removal and defrosting unit (1) includes: a bird-proof net, a hot air ring (11), a fixing ring (12), at least two hot air columns (13), a bottom plate (14) and a cover plate (15); the bird-proof net is a cylinder surrounded by a metal net and is connected to the inner sides of the hot air ring (11) and the fixing ring (12); the hot air column (13) is cylindrical, and a plurality of hot air holes (131) are provided on the wall of the hot air column (13), the hot air holes (131) face the bird-proof net, and both ends of at least two hot air columns (13) are respectively connected to the hot air ring (11) and the fixing ring (12) through bearings and are located outside the bird-proof net, and the inner cavities of the hot air ring (11) and the hot air column (13) are communicated; one end of the hot air column (13) connected to the fixing ring (12) is in a blocked state, and blind holes are provided on the hot air ring (11) and the fixing ring (12), each bearing is fixed in a blind hole, the outer ring of the bearing is fixedly connected to the wall of the blind hole, the inner ring of the bearing is connected to the hot air column (13), and the outer ring and the inner ring of the bearing can rotate relative to each other; the bottom plate (14) is connected to the inner wall of the hot air ring (11), and the bottom plate (14) has through holes; the cover plate (15) is installed on the top of the fixing ring (12); the ventilation unit (2) includes: multiple sections of ventilation pipes (21), a blower (22), a heat exchanger (23) and a valve group (24), and the through holes on the bottom plate (14), the blower (22), the heat exchanger (23) and the valve group (24) are sequentially communicated through the multiple sections of ventilation pipes (21), and a hot air outlet (211) is further provided on a section of ventilation pipe (21) between the heat exchanger (23) and the valve group (24); the draft fan (4) is used for drawing air for the heating furnace, and the heating furnace is used for providing heat source for the heat exchanger (23); the draft tube (5) passes through the heat exchanger (23) and is connected to the draft fan (4).

2. The device according to claim 1, characterized in that, the bottom plate (14) is funnel-shaped, and the through hole is located at the center of the bottom of the bottom plate (14).

3. The device according to claim 1, characterized in that, the cover plate (15) is umbrella-shaped.

4. The device according to claim 1, characterized in that, the cover plate (15) is installed on the top of the fixing ring (12) through at least two connecting columns; a preset distance is provided between any two adjacent connecting columns.

5. The device according to claim 1, characterized in that, the valve group (24) includes: a first manual valve (241), an electromagnetic valve (242), a second manual valve (243) and a third manual valve (244); The first manual valve (241), the solenoid valve (242), and the second manual valve (243) are connected in sequence and are in parallel with the third manual valve (244).

6. The device according to claim 5, wherein, the device further comprises a control unit (3); the control unit (3) is connected to the solenoid valve (242) through an optical cable.

7. The device according to claim 6, wherein, the control unit (3) is connected to the blower (22) and the heat exchanger (23) through optical cables respectively.

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