Chimney with self-cleaning dust falling function

Abstract

The utility model relates to the technical field of chimneys, in particular to a chimney with a self-cleaning dust falling function, and aims to solve the technical problems of low manual cleaning efficiency and poor chimney filtering effect in the prior art. The chimney specifically comprises a chimney body, a smoke guide channel arranged in the chimney body, a smoke inlet formed in one side of the bottom of the smoke guide channel, a smoke outlet formed in the top of the smoke guide channel and a smoke filter screen arranged between the smoke inlet and the smoke outlet in a blocking mode. A lower shaft seat is fixedly arranged at the bottom of the smoke guide channel, and a rotating rod is vertically arranged between the upper shaft seat and the lower shaft seat; according to the utility model, the atomization nozzle is matched with a multi-stage filtering structure, so that pollutants such as dust, dust and smoke dust in the smoke are further filtered, and the filtering effect is obviously improved. And meanwhile, through cooperation of the rotating rod, the scraping plate and the spraying mechanism, automatic cleaning of the interior of the chimney is achieved, the flue gas emission efficiency is improved, and the manual cleaning frequency and labor intensity are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chimneys, in particular to a chimney with a self-cleaning and dust reduction function. Background Art

[0002] Industrial production processes often involve the emission of large amounts of flue gas containing solid particles, primarily dust, dirt, and soot, which pose a serious threat to the environment and human health. Therefore, factories must filter these particles through chimneys before discharging them to reduce their harmful effects. However, after long-term use, traditional chimneys are prone to the accumulation of impurities, which affects the efficiency of flue gas emissions and requires frequent manual cleaning, which is not only labor-intensive but also difficult to guarantee. Furthermore, existing chimneys only use a single filter to filter particles, which has limited filtration effectiveness and is prone to saturation and clogging, significantly reducing filtration efficiency. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a chimney with a self-cleaning and dust reduction function in response to the deficiencies of the existing technology, which can effectively remove solid particles in the flue gas, reduce environmental pollution and threats to human health, and has a self-cleaning function, which can automatically clean impurities accumulated inside the chimney, improve the flue gas emission efficiency, and reduce the labor intensity and frequency of manual cleaning.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A chimney with a self-cleaning dust reduction function comprises a chimney body, a smoke guide channel arranged in the chimney body, a smoke inlet arranged on one side of the bottom of the smoke guide channel, a smoke outlet arranged at the top of the smoke guide channel, and a smoke filter arranged between the smoke inlet and the smoke outlet. The characteristics are:

[0006] An upper shaft seat is fixedly provided below the smoke filter, a lower shaft seat is fixedly provided at the bottom of the smoke guide channel, a rotating rod is vertically provided between the upper shaft seat and the lower shaft seat, at least one scraper that cooperates with the outer circumference of the smoke guide channel is provided on the outer side of the rotating rod, the scraper and the rotating rod are fixed by a plurality of connecting rods arranged side by side, and one end of the rotating rod is provided with a driving mechanism for driving it to rotate so as to drive the scraper to scrape and remove dirt from the outer circumference of the smoke guide channel;

[0007] A spray mechanism that cooperates with the scraper is provided between the upper shaft seat and the outer peripheral surface of the smoke guide channel. The spray mechanism includes a liquid storage box with an annular structure. The liquid storage box is fixedly connected to the outer peripheral surface of the smoke guide channel outwardly, and the liquid storage box is fixedly connected to the outer peripheral surface of the upper shaft seat inwardly through a number of supporting rods. The bottom of the liquid storage box is evenly distributed with a number of high-pressure nozzles facing the outer peripheral surface of the smoke guide channel. One side of the liquid storage box is connected to a liquid source, and a liquid inlet pipe port for connecting the high-pressure nozzles to supply liquid.

[0008] The technical problem to be solved by the present invention can be further achieved through the following steps: at least three support rods are evenly distributed with the upper shaft seat as the center, each support rod is provided with a cavity communicated with the liquid storage box, and the bottom of each cavity is equidistantly provided with a plurality of atomizing nozzles for dust reduction.

[0009] The technical problem to be solved by the present invention can be further achieved by the following steps: a base is fixedly provided under the chimney body, a liquid receiving chamber connected to the smoke guide channel is provided in the base, a discharge pipe opening communicating with the outside is provided on one side of the liquid receiving chamber, and a discharge valve is provided on the discharge pipe opening.

[0010] The technical problem to be solved by the present invention can be further achieved by the following steps: a return liquid pipe port is provided on the other side of the liquid receiving chamber, and a return liquid valve is provided on the return liquid pipe port; a circulation component is provided between the return liquid pipe port and the liquid inlet pipe port, and the circulation component includes a liquid storage tank, the liquid storage tank and the return liquid pipe port are connected by a return liquid pipe, a filter box and a one-way valve are provided on the return liquid pipe in sequence along the liquid flow direction, the liquid storage tank and the liquid inlet pipe port are connected by a liquid inlet pipe, a water pump and a liquid inlet valve are provided on the liquid inlet pipe in sequence along the liquid flow direction, a liquid infusion port is provided on the top of the liquid storage tank, and the liquid infusion port is connected to a liquid infusion pipe connected to a liquid source.

[0011] The technical problem to be solved by the present invention can be further achieved by the following steps: the filter box includes a box body and a plurality of filter plates arranged side by side inside the box body, a plurality of openings for inserting the filter plates are provided on the top of the box body, and a positioning base block cooperating with the filter plates is fixedly provided at the bottom of the box body.

[0012] The technical problem to be solved by the present invention can be further achieved by the following steps: the liquid receiving chamber is a rectangular structure, a water guide block is horizontally slidably provided at the bottom of the liquid receiving chamber, and a handle is provided on one side of the water guide block for easy pulling.

[0013] The technical problem to be solved by the present invention can be further achieved by the following steps: a mounting seat is provided between the flue gas filter and the outer peripheral surface of the smoke guide channel, the mounting seat and the outer peripheral surface of the smoke guide channel are detachably connected, a secondary filter is provided above the flue gas filter, and an activated carbon adsorption layer is provided between the secondary filter and the flue gas filter.

[0014] The technical problem to be solved by the present invention can be further achieved by the following steps: the upper end of the rotating rod passes through the upper shaft seat and extends upward, and a scraper is fixedly connected to the protruding end through a mounting sleeve, and the upper surface of the scraper is provided with a cleaning brush that cooperates with the smoke filter.

[0015] The technical problem to be solved by the present invention can be further achieved through the following steps: the driving mechanism includes a dustproof box fixedly arranged at the lower end of the rotating rod, the lower shaft seat is fixedly arranged in the dustproof box, and a driving motor is provided on the chimney body on one side of the dustproof box. The output end of the driving motor is fixedly connected to a transmission rod, and the transmission rod extends into the dustproof box and is connected to the rotating rod for transmission through a bevel gear structure.

[0016] The technical problem to be solved by the present invention can be further achieved by the following steps: the smoke inlet is connected to a smoke inlet pipe, a smoke guide fan is provided in the smoke inlet pipe, and a rainproof cap is fixed above the smoke outlet.

[0017] Compared with existing technologies, the present invention offers the following advantages: the fine water mist sprayed from the atomizing nozzle absorbs and settles solid particles in the flue gas, reducing the solid particle content in the flue gas. Combined with the multi-stage filtration structure (flue gas filter, secondary filter, and activated carbon adsorption layer), it further filters out pollutants such as dust, dirt, and soot from the flue gas, significantly improving filtration effectiveness. Furthermore, the coordinated use of the rotating rod, scraper, and spray mechanism enables automatic cleaning of the chimney interior, effectively preventing the accumulation of impurities, improving flue gas emission efficiency, reducing the frequency and labor intensity of manual cleaning, and ensuring smooth and efficient flue gas emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is an enlarged schematic diagram of the upper part of the utility model;

[0020] Figure 3 It is a top view schematic diagram of the spray mechanism of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the circulation component of the utility model;

[0022] Figure 5 This is a structural diagram of the filter box of the utility model;

[0023] Figure 6 This is a simple schematic diagram of the chimney body and base of the utility model;

[0024] In the figure: 1- chimney body; 2- smoke guide channel; 3- smoke inlet; 4- smoke outlet; 5- smoke filter; 6- upper shaft seat; 7- lower shaft seat; 8- rotating rod; 9- scraper; 10- connecting rod; 11- liquid storage box; 12- supporting rod; 13- high-pressure nozzle; 14- liquid inlet; 15- atomizing nozzle; 16- liquid receiving chamber; 17- liquid discharge; 18- liquid discharge valve; 19- liquid return; 20- liquid return valve; 21- Liquid storage tank; 22-return liquid pipe; 23-filter box; 24-check valve; 25-liquid inlet pipe; 26-water pump; 27-liquid inlet valve; 28-liquid replenishing pipe; 29-box; 30-filter plate; 31-water guide block; 32-mounting seat; 33-secondary filter; 34-activated carbon adsorption layer; 35-scraper; 36-cleaning brush; 37-dustproof box; 38-drive motor; 39-smoke inlet pipe; 40-rainproof cap; 41-base;. DETAILED DESCRIPTION

[0025] The specific technical solutions of the present invention are further described below so that those skilled in the art can further understand the present invention, but it does not constitute a limitation to their rights.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the utility model.

[0027] Please refer to Figure 1 A chimney with self-cleaning and dust reduction function includes a chimney body 1, a smoke guide channel 2 arranged in the chimney body 1, a smoke inlet 3 arranged on one side of the bottom of the smoke guide channel 2, a smoke outlet 4 arranged at the top of the smoke guide channel 2, and a smoke filter 5 arranged between the smoke inlet 3 and the smoke outlet 4.

[0028] Please refer to Figure 1-4 An upper shaft seat 6 is fixedly provided below the smoke filter 5, and a lower shaft seat 7 is fixedly provided at the bottom of the smoke guide channel 2. A rotating rod 8 is vertically provided between the upper shaft seat 6 and the lower shaft seat 7. The rotating rod 8, the upper shaft seat 6, and the lower shaft seat 7 are all coaxially arranged with the smoke guide channel 2. The outer side of the rotating rod 8 is provided with at least one (two in this embodiment) scraper 9 that cooperates with the outer circumference of the smoke guide channel 2. The outer side surface of the scraper 9 is in contact with the outer circumference of the smoke guide channel 2. The scraper 9 and the rotating rod 8 are fixed by a plurality (three in this embodiment) of connecting rods 10 arranged side by side. One end of the rotating rod 8 is provided with a driving mechanism that drives it to rotate, thereby driving the scraper 9 to scrape and remove dirt from the outer circumference of the smoke guide channel 2.

[0029] Please refer to Figure 1-4 A spray mechanism that cooperates with the scraper 9 is provided between the upper shaft seat 6 and the outer circumference of the smoke guide channel 2. The spray mechanism includes a liquid storage box 11 with an annular structure. The liquid storage box 11 is fixedly connected to the outer circumference of the smoke guide channel 2 outwardly. The liquid storage box 11 is fixedly connected to the outer circumference of the upper shaft seat 6 inwardly through a plurality of (four in this embodiment) support rods 12. The bottom of the liquid storage box 11 is evenly distributed with a plurality of (eight in this embodiment) high-pressure nozzles 13 facing the outer circumference of the smoke guide channel 2. One side of the liquid storage box 11 is connected to a liquid source and a liquid inlet port 14 for connecting the high-pressure nozzles 13 to supply liquid. An acute angle with a downward opening is formed between the high-pressure nozzle 13 and the outer circumference of the smoke guide channel 2, so that the liquid flow flushes the outer circumference of the smoke guide channel 2 from top to bottom, and cooperates with the scraping action of the scraper 9 to scrub off the dirt adhering to it. The liquid flow can be water or other cleaning liquids commonly used in the field.

[0030] Please refer to Figure 1-2 At least three (four in this embodiment) support rods 12 are evenly distributed around the upper shaft seat 6. Each support rod 12 has a cavity in communication with the liquid storage box 11. A plurality of dust reduction atomizing nozzles 15 are evenly spaced at the bottom of each cavity. The atomizing nozzles 15 can atomize the dust reduction liquid into tiny particles, which can more fully contact and absorb solid particles in the flue gas, thereby more effectively reducing the dust content in the flue gas.

[0031] Please refer to Figure 1 、 6 A rectangular base 41 is fixedly mounted below the chimney body 1 and is integrally connected to the chimney body 1. A liquid receiving chamber 16, which communicates with the smoke guide channel 2, is located within the base 41. A drain port 17, which communicates with the outside world, is located on one side of the chamber. A drain valve 18 is installed on the drain port 17. During use, waste liquid accumulated in the chamber 16 can be discharged through the drain valve 18.

[0032] Please refer to Figure 1 、 4A return pipe opening 19 is provided on the other side of the liquid receiving chamber 16, and a return valve 20 is installed on the return pipe opening 19. A circulation assembly is provided between the return pipe opening 19 and the liquid inlet opening 14. The circulation assembly includes a liquid storage tank 21, which is connected to the return pipe opening 19 via a return pipe 22. A filter box 23 and a one-way valve 24 are provided on the return pipe 22 in the direction of liquid flow. The liquid storage tank 21 is connected to the liquid inlet opening 14 via a liquid inlet pipe 25, which is equipped with a water pump 26 and a liquid inlet valve 27 in the direction of liquid flow. A liquid inlet port is provided at the top of the liquid storage tank 21, and the liquid inlet port is connected to a liquid inlet pipe 28 connected to a liquid source. The circulation assembly is used to collect, filter, and recycle waste liquid generated by the spray mechanism.

[0033] Please refer to Figure 5 The filter box 23 includes a box body 29 and a plurality of filter plates 30 arranged side by side inside the box body 29. The top of the box body 29 is provided with a plurality of openings for inserting the filter plates 30, and the bottom of the box body 29 is fixed with a positioning base block that cooperates with the filter plates 30. When cleaning is required, the filter plates 30 are pulled out from the top opening of the filter box 23 and then inserted back into the box after cleaning is completed. This is convenient and quick to use.

[0034] Please refer to Figure 1 The liquid receiving chamber 16 is a rectangular structure. A water guide block 31 is provided at the bottom of the liquid receiving chamber 16 for horizontal sliding movement. The upper surface of the water guide block 31 can be an inverted V-shape or a semi-arc shape, with a high center and low sides, to transport the liquid flow to the discharge pipe 17 and the return pipe 19. To facilitate cleaning of dirt attached to the surface of the water guide block 31, a handle is provided on one side of the water guide block 31 for easy pulling.

[0035] Please refer to Figure 1-2 A mounting base 32 is provided between the flue gas filter 5 and the outer circumference of the smoke guide channel 2. The mounting base 32 is detachably connected to the outer circumference of the smoke guide channel 2 via bolts. A secondary filter 33 is provided above the flue gas filter 5. Both the secondary filter 33 and the flue gas filter 5 are detachably connected to the mounting base 32. An activated carbon adsorption layer 34 is provided between the secondary filter 33 and the flue gas filter 5. The activated carbon adsorption layer 34 can effectively absorb harmful gases such as ammonia and hydrogen sulfide mixed in the flue gas, effectively improving the gas purification capability.

[0036] Please refer to Figure 1-2 The upper end of the rotating rod 8 passes through the upper shaft seat 6 and extends upward. A scraper 35 is fixedly connected to the extended end via a mounting sleeve. The upper surface of the scraper 35 is provided with a cleaning brush 36 that cooperates with the smoke filter 5. This allows the outer surface of the smoke guide channel 2 to be cleaned simultaneously with the surface of the smoke filter 5, without the need to frequently disassemble the mounting seat 32.

[0037] Please refer to Figure 1The driving mechanism includes a dustproof box 37 fixed to the lower end of the rotating rod 8, the lower shaft seat 7 is fixed in the dustproof box 37, and a driving motor 38 is fixedly installed on the chimney body 1 on one side of the dustproof box 37. The output end of the driving motor 38 is coaxially fixedly connected with a transmission rod, and the transmission rod extends into the dustproof box 37 and is connected to the rotating rod 8 for transmission through a bevel gear structure.

[0038] Please refer to Figure 1 The smoke inlet 3 is connected to a smoke inlet pipe 39 , a smoke guide fan is provided in the smoke inlet pipe 39 , and a rainproof cap 40 is fixed above the smoke outlet 4 .

[0039] Working principle: The utility model is a chimney with a self-cleaning and dust reduction function. When in use, the flue gas enters the smoke guide channel 2 through the smoke inlet pipe 39, and the smoke guide fan provides power for the smoke to flow upward along the smoke guide channel 2. At the same time, the spray mechanism is started, and the atomizing nozzle 15 atomizes water into tiny particles, which contact and adsorb solid particles in the flue gas, effectively reducing the particle content in the flue gas. The settled flue gas rises and is initially filtered through the flue gas filter 5 to filter out larger solid particles. The flue gas then passes through the activated carbon adsorption layer 34 and the secondary filter 33 to further remove fine dust, dust, smoke and harmful gases such as ammonia, hydrogen sulfide, etc. The purified flue gas continues to rise and is discharged through the flue gas outlet 4.

[0040] After a period of use, when cleaning is required, the drive motor 38 is started, and the rotating rod 8 is driven to rotate through the transmission rod and the bevel gear structure. The rotation of the rotating rod 8 causes the scraper 9 to scrape the outer peripheral surface of the smoke guide channel 2, scrubbing off the dirt adhering thereto. At the same time, the water pump 26 is powered, and the water flow sprayed from the high-pressure nozzle 13 flushes the outer peripheral surface of the smoke guide channel 2 from top to bottom, cooperating with the scraping action of the scraper 9 to further remove the dirt and ensure the cleanliness of the inside of the chimney. At the same time, the scraper 35 and the cleaning brush 36 at the upper end of the rotating rod 8 move with the rotation of the rotating rod 8, cleaning the surface of the flue gas filter 5, and realizing automatic cleaning of the flue gas filter 5.

[0041] During the cleaning process, the generated sewage flows into the liquid receiving chamber 16 through the smoke guide channel 2. The water guide block 31 in the liquid receiving chamber 16 guides the liquid flow to the drain pipe 17 and the return pipe 19 respectively. As needed, the wastewater accumulated in the liquid receiving chamber 16 can be discharged by opening the drain valve 18; in order to save water resources and reduce waste liquid discharge, you can also choose to open the return valve 20 separately to send the waste liquid into the filter box 23 through the return pipe 22. The filter plate 30 in the filter box 23 filters the waste liquid to remove impurities and particulate matter. The filtered waste liquid enters the liquid storage tank 21 through the one-way valve 24 and mixes with the new water flow injected from the liquid replenishment pipe 28. Subsequently, the water pump 26 returns the water in the liquid storage tank 21 to the spray mechanism through the liquid inlet pipe 25 to achieve the recycling of waste water.

[0042] To sum up, the chimney with self-cleaning and dust reduction function of the utility model realizes efficient purification of flue gas and automatic cleaning of the inside of the chimney through the design of multi-stage filtration structure, automatic cleaning mechanism and circulation component, which significantly improves the efficiency and environmental protection performance of flue gas emission.

[0043] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

Claims

1. A chimney with a self-cleaning dust reduction function, comprising a chimney body, a smoke guide channel provided in the chimney body, a smoke inlet provided at one side of the bottom of the smoke guide channel, a smoke outlet provided at the top of the smoke guide channel, and a smoke filter provided between the smoke inlet and the smoke outlet, characterized in that: An upper shaft seat is fixedly provided below the smoke filter, a lower shaft seat is fixedly provided at the bottom of the smoke guide channel, a rotating rod is vertically provided between the upper shaft seat and the lower shaft seat, at least one scraper that cooperates with the outer circumference of the smoke guide channel is provided on the outer side of the rotating rod, the scraper and the rotating rod are fixed by a plurality of connecting rods arranged side by side, and one end of the rotating rod is provided with a driving mechanism for driving it to rotate so as to drive the scraper to scrape and remove dirt from the outer circumference of the smoke guide channel; A spray mechanism that cooperates with the scraper is provided between the upper shaft seat and the outer peripheral surface of the smoke guide channel. The spray mechanism includes a liquid storage box with an annular structure. The liquid storage box is fixedly connected to the outer peripheral surface of the smoke guide channel outwardly, and the liquid storage box is fixedly connected to the outer peripheral surface of the upper shaft seat inwardly through a number of supporting rods. The bottom of the liquid storage box is evenly distributed with a number of high-pressure nozzles facing the outer peripheral surface of the smoke guide channel. One side of the liquid storage box is connected to a liquid source, and a liquid inlet pipe port for connecting the high-pressure nozzles to supply liquid.

2. The chimney with self-cleaning dust reduction function according to claim 1, characterized in that: At least three support rods are evenly distributed around the upper shaft seat, each support rod is provided with a cavity communicated with the liquid storage box, and a plurality of atomizing nozzles for dust reduction are equidistantly provided at the bottom of each cavity.

3. The chimney with self-cleaning dust reduction function according to claim 2, characterized in that: A base is fixedly provided below the chimney body, a liquid receiving chamber connected to the smoke guide channel is provided in the base, a liquid discharge pipe opening communicating with the outside is provided on one side of the liquid receiving chamber, and a liquid discharge valve is provided on the liquid discharge pipe opening.

4. The chimney with self-cleaning and dust reduction function according to claim 3 is characterized in that: A return liquid pipe port is provided on the other side of the liquid receiving chamber, and a return liquid valve is provided on the return liquid pipe port; a circulation component is provided between the return liquid pipe port and the liquid inlet pipe port, and the circulation component includes a liquid storage tank, the liquid storage tank and the return liquid pipe port are connected by a return liquid pipe, a filter box and a one-way valve are provided on the return liquid pipe in sequence along the liquid flow direction, the liquid storage tank and the liquid inlet pipe port are connected by a liquid inlet pipe, a water pump and a liquid inlet valve are provided on the liquid inlet pipe in sequence along the liquid flow direction, a liquid infusion port is provided on the top of the liquid storage tank, and the liquid infusion port is connected to a liquid infusion pipe connected to a liquid source.

5. The chimney with self-cleaning and dust reduction function according to claim 4 is characterized in that: The filter box includes a box body and a plurality of filter plates arranged side by side inside the box body. A plurality of openings for inserting the filter plates are provided on the top of the box body, and a positioning base block matched with the filter plates is fixedly provided on the bottom of the box body.

6. The chimney with self-cleaning and dust reduction function according to claim 3 is characterized in that: The liquid receiving chamber is a rectangular structure, and a water guide block is provided at the bottom of the liquid receiving chamber for horizontal sliding. A handle for easy pulling is provided on one side of the water guide block.

7. The chimney with self-cleaning and dust reduction function according to claim 1, characterized in that: A mounting seat is provided between the smoke filter and the outer peripheral surface of the smoke guide channel. The mounting seat and the outer peripheral surface of the smoke guide channel are detachably connected. A secondary filter is provided above the smoke filter, and an activated carbon adsorption layer is provided between the secondary filter and the smoke filter.

8. The chimney with self-cleaning and dust reduction function according to claim 1, characterized in that: The upper end of the rotating rod passes through the upper shaft seat and extends upward, and a scraper is fixedly connected to the extended end through a mounting sleeve. The upper surface of the scraper is provided with a cleaning brush that matches the smoke filter.

9. The chimney with self-cleaning and dust reduction function according to claim 1, characterized in that: The driving mechanism includes a dustproof box fixedly arranged at the lower end of the rotating rod, the lower shaft seat is fixedly arranged in the dustproof box, a driving motor is provided on the chimney body on one side of the dustproof box, and the output end of the driving motor is fixedly connected to a transmission rod, the transmission rod extends into the dustproof box and is connected to the rotating rod for transmission through a bevel gear structure.

10. The chimney with self-cleaning and dust reduction function according to claim 1, characterized in that: The smoke inlet is connected to a smoke inlet pipe, a smoke guide fan is arranged in the smoke inlet pipe, and a rainproof cap is fixedly arranged above the smoke outlet.

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