Flue type waste heat recycling device

Abstract

The utility model discloses a flue type waste heat recycling device, which belongs to the field of waste heat recovery and comprises a flue connecting pipe, a switch component arranged at the right end of the flue connecting pipe, a dust backflow prevention component arranged at the right end of the switch component, and a filter component arranged at the right end of the dust backflow prevention component. According to the technical scheme, the heat storage device is characterized in that reverse protruding blocks which are distributed in a staggered mode are arranged in a conveying pipe, dust backflow is effectively prevented, the situation that dust flows back to block a flue connecting pipe is avoided, a large-hole filtering plate and a small-hole filtering plate are sequentially arranged in the filtering assembly in a matched mode, and the heat storage assemblies are arranged at the outer end of the filtering assembly in a matched mode. The waste heat is filtered in a classified mode; meanwhile, the contact area with the waste heat is increased through spiral heat conduction pieces in the heat storage assembly, meanwhile, a circulation loop is formed through a backflow pipe, the waste heat circulates in the device, the heat storage assembly can be independently taken down to be used at other places, and waste heat recycling is effectively achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of waste heat recovery, especially a flue type waste heat recycling device. BACKGROUND

[0002] In various activities of industrial production and daily life, combustion process exists widely, and the flue gas generated thereby often carries a large amount of waste heat. In the traditional case, these waste heats are mostly directly discharged into the atmosphere without being fully utilized, which not only causes great waste of energy, but also has negative effects such as thermal pollution to the environment due to the emission of high-temperature gas.

[0003] Chinese patent application No. CN202421258078.9 provides a boiler flue gas waste heat recycling device. The device is provided with a waste heat utilization tank at the upper end of the box, an inlet pipe is arranged at the upper end of one side of the tank to put cold water into the tank, a spiral gas guide pipe is arranged in the tank, the lower end of the spiral gas guide pipe extends into the box, and the upper end of the spiral gas guide pipe extends to the outside of the waste heat utilization tank. The filtered flue gas is discharged to the outside through the spiral gas guide pipe. The continuous flue gas waste heat can heat the cold water stored in the waste heat utilization tank to a predetermined temperature through the spiral gas guide pipe and then discharge the water through the outlet pipe. However, during the waste heat recycling process, the flue gas contains dust particles. During the process of conveying the flue gas, the dust may backflow and block the pipeline. In addition, during the waste heat recycling process, some equipment needs flowing hot gas, and some equipment needs fixed heat source. The waste heat recycling device mentioned in the above patent is not convenient for preventing the dust in the flue gas from backflowing, and it is also not convenient for dividing the waste heat into flowing hot gas and fixed heat source. The available range of the waste heat recycling device is limited, and it cannot meet the needs of users for convenient use, efficient storage, and transfer utilization of the waste heat.

[0004] Therefore, we propose a flue type waste heat recycling device. Utility model content

[0005] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a flue type waste heat recycling device. The device is provided with reverse protrusions in a staggered distribution in the conveying pipe to effectively block the backflow of dust and avoid the backflow of dust blocking the flue connecting pipe. The device is also provided with a filter assembly in which a large-hole filter plate and a small-hole filter plate are sequentially arranged to perform graded filtration on the waste heat. Meanwhile, the spiral heat-conducting fins in the heat storage assembly increase the contact area with the waste heat. The device forms a circulation loop through the backflow pipe to circulate the waste heat in the device. The heat storage assembly can be separately taken out and used elsewhere to effectively realize waste heat recycling.

[0006] The above technical purpose of the utility model is achieved by the following technical scheme:

[0007] A flue heat recovery device, comprising a flue connecting pipe, a switch assembly is arranged at the right end of the flue connecting pipe, a dust-proof backflow assembly is arranged at the right end of the switch assembly, a filter assembly is arranged at the right end of the dust-proof backflow assembly, a plurality of heat storage assemblies are arranged at the outer end of the filter assembly in equidistant circumferential arrangement, and one end of the heat storage assembly away from the filter assembly is connected with the dust-proof backflow assembly; the dust-proof backflow assembly comprises a conveying pipe, a threaded groove is formed at the left end in the conveying pipe, a plurality of reverse protrusions are arranged at the right end of the threaded groove, the reverse protrusions are fixedly connected with the inner wall of the conveying pipe, the reverse protrusions are distributed in a staggered manner, a narrow pipe is arranged at the right end of the reverse protrusion, and an internally threaded connecting pipe is fixedly connected with the right end of the narrow pipe; the filter assembly comprises a filter pipe, an externally threaded connecting pipe is fixedly connected with the left end of the filter pipe, the externally threaded connecting pipe is threadedly connected with the threaded connecting pipe, a recovery pipeline is fixedly connected with the right end of the filter pipe, and a large-hole filter plate and a small-hole filter plate are sequentially arranged in the filter pipe from left to right; the heat storage assembly comprises a heat preservation pipe, a pair of left-right symmetrical backflow pipes are fixedly connected with the outer end of the heat preservation pipe, the left end of the backflow pipe is communicated with the conveying pipe, the right end of the backflow pipe is communicated with the filter pipe, a heat storage block is fixedly connected in the heat preservation pipe, a heat conduction sheet is fixedly connected with the inner end of the heat storage block, an inner pipe is fixedly connected in the heat conduction sheet, and the inner pipe is communicated with the heat preservation pipe.

[0008] The flue connecting pipe is used for connecting the flue and is a component for connecting the entire device with the flue, which communicates the flue with subsequent components and provides a channel for introduction of waste heat; the switch assembly is arranged at the right end of the flue connecting pipe and serves as a switch for controlling whether waste heat enters the subsequent components, which can be opened or closed to transport waste heat; the dust-proof backflow assembly is arranged at the right end of the switch assembly and can prevent dust backflow, ensure the cleanliness of the device and avoid the influence of dust on the subsequent components; the filter assembly is arranged at the right end of the dust-proof backflow assembly, filters the entering waste heat, removes impurities in the waste heat and improves the purity of the waste heat, and the pure hot air can be transported to other positions for use in later period; the heat storage assembly is arranged at the outer end of the filter assembly in equidistant circumferential arrangement, is used for storing the filtered waste heat, realizes the recycling of waste heat, forms a loop through the connection with the dust-proof backflow assembly, and the user can also separately take down the heat storage assembly and use it in other places requiring heat sources.

[0009] Further, the switch assembly comprises a communication pipe, a connecting ring is fixedly connected with the left end of the communication pipe, and the connecting ring is threadedly connected with the flue connecting pipe.

[0010] Further, a screw rod is rotatably connected with the top end of the communication pipe, and a knob is fixedly connected with the top end of the screw rod.

[0011] Further, the bottom end of the screw rod penetrates the top end of the communication pipe and extends to the inside of the communication pipe, and a plug is fixedly connected to the inside of the communication pipe.

[0012] Further, the inside of the communication pipe is provided with a flow channel matched with the plug.

[0013] Further, the outer wall of the conveying pipe and outside of the reverse protrusion is provided with a through hole matched with the return pipe.

[0014] Further, the outer wall of the filter pipe and left side of the large-pore filter plate is provided with a through hole matched with the return pipe.

[0015] Further, the heat-conducting sheet is in a spiral shape.

[0016] In summary, the utility model has the following beneficial effects:

[0017] 1. Efficient dust prevention and internal cleaning: the reverse protrusions arranged in a staggered manner in the conveying pipe effectively block the return of dust and prevent the flue connecting pipe from being blocked by the return of dust.

[0018] 2. Double filtration and improved waste heat quality: the large-pore filter plate and the small-pore filter plate are arranged in the filter assembly in sequence to perform graded filtration on the waste heat; the large-pore filter plate first filters out larger impurities, and the small-pore filter plate then processes smaller impurities, so that the double filtration greatly improves the purity of the waste heat, provides a higher-quality heat source for subsequent waste heat utilization, and improves the waste heat utilization efficiency and effect.

[0019] 3. Strengthened heat storage and improved waste heat utilization rate: the spiral heat-conducting sheet in the heat storage assembly increases the contact area with the waste heat, prolongs the flow path of the waste heat, and enables the waste heat and the heat storage block to fully exchange heat. At the same time, the return pipe forms a circulation loop, so that the waste heat circulates in the device, further improves the heat storage efficiency, effectively realizes waste heat recycling, improves the energy utilization rate, and reduces energy waste. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure in the embodiment;

[0021] Figure 2 is a schematic diagram of the overall structure in the embodiment;

[0022] Figure 3 is a sectional view of the overall structure in the embodiment;

[0023] Figure 4 is a sectional view of the overall structure in the embodiment;

[0024] Figure 5 is a schematic diagram of the heat storage assembly in the embodiment.

[0025] In the figure, 1, flue connecting pipe; 2, switch assembly; 3, anti-dust backflow assembly; 4, filter assembly; 5, heat storage assembly; 202, communicating pipe; 203, connecting ring; 204, screw rod; 205, knob; 206, plug; 301, conveying pipe; 302, threaded groove; 303, internally threaded connecting pipe; 304, reverse protruding block; 305, narrow pipe; 401, filter pipe; 402, externally threaded connecting pipe; 403, recovery pipeline; 404, large-pore filter plate; 405, small-pore filter plate; 501, heat preservation pipe; 502, heat storage block; 504, inner pipe; 505, heat-conducting sheet; 506, backflow pipe. DETAILED DESCRIPTION

[0026] The utility model will be made further detailed description in combination with the drawings.

[0027] Identical parts are denoted by identical reference numerals. It is to be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom" and "top", "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0028] Reference Figures 1-5As shown, it is a flue type waste heat recycling device in the utility model, including flue connecting pipe 1, the right end of flue connecting pipe 1 is provided with switch assembly 2, the right end of switch assembly 2 is provided with anti-dust backflow assembly 3, the right end of anti-dust backflow assembly 3 is provided with filter assembly 4, the outer end of filter assembly 4 is provided with a plurality of equidistant circumferential arrangement heat storage assembly 5, and the end, away from filter assembly 4, of heat storage assembly 5 is connected with anti-dust backflow assembly 3;Anti-dust backflow assembly 3 includes conveying pipe 301, and the left end inside conveying pipe 301 is provided with threaded groove 302, the right end of threaded groove 302 is provided with a plurality of reverse lugs 304, a plurality of reverse lugs 304 are fixedly connected with the inner wall of conveying pipe 301, a plurality of reverse lugs 304 are distributed in disorder, the right end of reverse lug 304 is provided with narrow tube 305, and the right end of narrow tube 305 is fixedly connected with internal thread connecting pipe 303;Filter assembly 4 includes filter pipe 401, and the left end of filter pipe 401 is fixedly connected with external thread connecting pipe 402, and external thread connecting pipe 402 is threadedly connected with threaded connecting pipe 303, and the right end of filter pipe 401 is fixedly connected with recovery pipeline 403, and the inside of filter pipe 401 is sequentially provided with large-hole filter plate 404 and small-hole filter plate 405 from left to right;Heat storage assembly 5 includes heat preservation pipe 501, and the outer end of heat preservation pipe 501 is fixedly connected with a pair of left-right symmetrical backflow pipes 506, the left end backflow pipe 506 communicates with conveying pipe 301, the right end backflow pipe 506 communicates with filter pipe 401, heat preservation pipe 501 is fixedly connected with heat storage block 502 in the inside, heat storage block 502 is fixedly connected with heat-conducting fin 505 in the inner end, heat-conducting fin 505 is fixedly connected with inner tube 504 in the inside, and inner tube 504 communicates with heat preservation pipe 501;

[0029] Flue connecting pipe 1: for connecting the flue, is the whole device and the flue connecting part, play the flue and subsequent assembly communication function, provide the channel for the introduction of waste heat;Switching assembly 2: set in the flue connecting pipe 1 right end, play the switching function of control waste heat whether into subsequent assembly, can open or close the delivery of waste heat;Anti dust backflow assembly 3: in the switching assembly 2 right end, can prevent dust backflow, ensure the cleanliness inside the device, avoid the influence of dust on subsequent assembly;Filter assembly 4: located in the anti dust backflow assembly 3 right end, filter the waste heat, remove the impurities in it, improve the purity of waste heat, the pure heat can be transported to other places for use in later period;Heat storage assembly 5: a plurality of equidistant circumferential arrangement in the filter assembly 4 outer end, for storing the filtered waste heat, realize the recycling of waste heat, and through the connection with anti dust backflow assembly 3 form a loop, the user can also separately take down heat storage assembly 5 and then used in other places where heat source is needed;Among them, the delivery pipe 301: is the main body of anti dust backflow assembly 3, for conveying waste heat, provide the channel for the flow of waste heat;Thread groove 302: set in the inside left end of delivery pipe 301, can be screwed with other parts, play the effect of connection and fixed;Reverse protrusion 304: fixedly connected with the inner wall of delivery pipe 301 and staggered distribution, use its reverse structure to block the backflow of dust, play the effect of anti dust;Narrow pipe 305: located in the right end of reverse protrusion 304, can accelerate the waste heat, improve the flow rate of waste heat, is conducive to the delivery and subsequent processing of waste heat;Internal thread connecting pipe 303: fixedly connected with the right end of narrow pipe 305, for connecting with other parts with external thread, realize the assembly and fixed between components, filter pipe 401: is the main body of filter assembly 4, provide space for filtering process, make the waste heat pass through the filter plate for filtering in it;External thread connecting pipe 402: fixedly connected with the left end of filter pipe 401, screwed with internal thread connecting pipe 303, realize the connection and fixed of filter assembly 4 and anti dust backflow assembly 3;Pipe 403: fixedly connected with the right end of filter pipe 401, for leading out the filtered waste heat, in order to carry on the subsequent use or processing;Hole filter plate 404, small hole filter plate 405: set in the inside of filter pipe 401 in turn, through the filter plate with different aperture to carry on the graded filtering of impurities in waste heat, large hole filter plate first filters larger impurities, small hole filter plate filters smaller impurities again, improve the filtering effect;Heat preservation pipe 501: the main body of heat storage assembly 5, play the effect of heat preservation, reduce the heat loss of stored waste heat, ensure the storage effect of waste heat;Backflow pipe 506: a pair of left and right symmetrically fixed in the outer end of heat preservation pipe 501, respectively communicate with delivery pipe 301 and filter pipe 401, form the circulating loop of waste heat, make the waste heat can circulate in the device;Heat storage block 502: fixedly connected with the inside of heat preservation pipe 501, for storing waste heat, store the heat of waste heat, realize the recycling of waste heat.Heat-conducting sheet 505: fixed at the inner end of heat storage block 502, plays a role in heat conduction, transmits the heat of the residual heat in inner tube 504 to heat storage block 502, and improves the heat storage efficiency; inner tube 504: fixed inside heat-conducting sheet 505 and in communication with heat preservation tube 501, is a channel for the flow of residual heat in heat storage assembly 5, so that the residual heat can be in full contact with heat storage block 502 for heat exchange, the inside of heat storage block 502 can use a paraffin phase change material or a hydrated salt phase change material, and heat storage block 502 can use a metal material or a ceramic material with good heat conduction effect.

[0030] The switch assembly 2 comprises a communication pipe 202, and a connecting ring 203 is fixedly connected to the left end of the communication pipe 202 and is in threaded connection with the flue connecting pipe 1.

[0031] The communication pipe 202 is the main body of the switch assembly 2 and serves to connect the flue connecting pipe 1 and the subsequent assembly, so that the residual heat can pass through; the connecting ring 203 is fixedly connected to the left end of the communication pipe 202 and is in threaded connection with the flue connecting pipe 1, thereby achieving the connection and fixation of the switch assembly 2 and the flue connecting pipe 1 and ensuring the stability of the connection.

[0032] The top end of the communication pipe 202 is rotatably connected to a screw rod 204, and the top end of the screw rod 204 is fixedly connected to a knob 205.

[0033] The screw rod 204 is rotatably connected to the top end of the communication pipe 202, and the up-and-down movement of the screw rod 204 in the communication pipe 202 can be controlled by rotating the screw rod 204; the knob 205 is fixed to the top end of the screw rod 204, so as to facilitate the rotation of the screw rod 204 by an operator and thus achieve the operation control of the screw rod 204.

[0034] The bottom end of the screw rod 204 penetrates through the top end of the communication pipe 202 and extends into the interior of the communication pipe 202 and is fixedly connected to a plug 206, and the plug 206 is in threaded connection with a threaded groove 302.

[0035] The plug 206 is fixed to the bottom end of the screw rod 204, and the plug 206 can move up and down by the rotation of the screw rod 204; when the plug 206 cooperates with the flow channel in the interior of the communication pipe 202, the residual heat channel can be closed; when the plug 206 is away from the flow channel, the residual heat can pass through, thereby playing a role of switch, and the threaded connection between the plug 206 and the threaded groove 302 can further fix the position of the plug 206.

[0036] A flow channel adapted to the plug 206 is formed in the interior of the communication pipe 202.

[0037] The flow channel is formed in the interior of the communication pipe 202 and is adapted to the plug 206; when the plug 206 moves to the position of the flow channel, the flow channel can be blocked to prevent the residual heat from passing through, thereby achieving the function of switch; when the plug 206 is away from the flow channel, the residual heat can pass through the flow channel, thereby ensuring the delivery of the residual heat.

[0038] The outer wall of the conveying pipe 301 and outside the reverse block 304 is provided with a through hole adapted to the return pipe 506;

[0039] The through hole is provided in the outer wall of the conveying pipe 301 and outside the reverse block 304, is adapted to the return pipe 506, enables the return pipe 506 to communicate with the conveying pipe 301, forms a waste heat circulation loop, ensures the circulation of waste heat in the device, and facilitates the installation and removal of the heat storage assembly 5.

[0040] The outer wall of the filtering pipe 401 and the left side of the large-pore filter plate 404 are provided with a through hole adapted to the return pipe 506;

[0041] The through hole is provided in the outer wall of the filtering pipe 401 and the left side of the large-pore filter plate 404, is adapted to the return pipe 506, enables the return pipe 506 to communicate with the filtering pipe 401, forms a waste heat circulation loop, ensures the circulation of waste heat in the device, enables the waste heat that has not passed through the large-pore filter plate 404 to enter the heat storage assembly 5, and facilitates the installation and removal of the heat storage assembly 5.

[0042] The heat-conducting sheet 505 is in a spiral shape;

[0043] The spiral heat-conducting sheet 505 increases the contact area between the heat-conducting sheet 505 and the waste heat, prolongs the flow path of the waste heat in the heat storage assembly 5, enables the waste heat to exchange heat with the heat storage block 502 more fully, and improves the heat storage efficiency.

[0044] Specific implementation process: first, the flue connecting pipe 1 is connected with the flue, the communication pipe 202 in the switch assembly 2 is installed at the right end of the flue connecting pipe 1 through the threaded connection of the connecting ring 203 and the flue connecting pipe 1, and the tightness and stability of the connection are ensured;When the waste heat in the flue needs to be recycled, rotate the knob 205 to drive the screw rod 204 to rotate, since the screw rod 204 is rotatably connected with the top end of the communication pipe 202, the screw rod 204 will move upward when rotating, so that the plug 206 moves away from the flow channel in the communication pipe 202, at this time the waste heat can enter the subsequent assembly through the communication pipe 202;After the waste heat enters the conveying pipe 301, it first passes through the threaded groove 302, since the threaded groove 302 can be connected with other components, here the stability of the connection between the conveying pipe 301 and other components is ensured;Next, the waste heat meets the reverse protruding block 304, the reverse protruding block 304 is distributed in a staggered manner and is reversely arranged to prevent dust backflow;The waste heat continues to flow to the right, when passing through the narrow pipe 305, the structure of the narrow pipe 305 can accelerate the waste heat to improve the flow rate of the waste heat, which is conducive to subsequent filtration and storage;Then, the waste heat enters the filter pipe 401 through the internally threaded connecting pipe 303, the threaded connection between the internally threaded connecting pipe 303 and the externally threaded connecting pipe 402 realizes the connection between the anti-dust backflow assembly 3 and the filter assembly 4;In the filter pipe 401, the waste heat first passes through the large-hole filter plate 404, which can filter out larger impurities in the waste heat, and then passes through the small-hole filter plate 405 to further filter out smaller impurities, thereby improving the purity of the waste heat;The filtered waste heat is led out through the recovery pipe 403 and can be used in other places where hot gas is needed, while the hot gas that does not pass through the large-hole filter plate 404 will enter the backflow pipe 506 of the heat storage assembly 5 through the through hole on the outer wall of the filter pipe 401 located to the left of the large-hole filter plate 404, and then enter the heat storage pipe 501 from the backflow pipe 506, since the inner pipe 504 is in communication with the heat storage pipe 501, the hot gas enters the inner pipe 504 from the heat storage pipe 501, and then flows to the left end of the heat storage pipe 501 from the inner pipe 504, and then enters the backflow pipe 506 at the left end, and finally flows back to the conveying pipe 301, forming a circulating loop, during the flow of the waste heat, the heat is transferred to the heat storage block 502 through the spiral heat-conducting fins 505, the spiral heat-conducting fins 505 increase the contact area with the waste heat, so that the heat can be more fully transferred to the heat storage block 502, realizing the storage of the waste heat;The waste heat can circulate in the device continuously, improving the utilization rate and storage effect of the waste heat;When the waste heat does not need to be recycled, rotate the knob 205 in the opposite direction to move the plug 206 downward, the plug 206 cooperates with the flow channel in the communication pipe 202 to block the flow channel and prevent the waste heat from entering the subsequent assembly, realizing the closing function, in addition, since the through holes on the outer wall of the conveying pipe 301 and the filter pipe 401 are matched with the backflow pipe 506, the heat storage assembly 5 is convenient to install and disassemble, when the stored waste heat needs to be used in other places, the heat storage assembly 5 can be taken down separately for use.

[0045] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A flue heat recovery device, characterized by: The application relates to a flue connecting pipe (1), the right end of the flue connecting pipe (1) is provided with a switch assembly (2), the right end of the switch assembly (2) is provided with a dust backflow prevention assembly (3), the right end of the dust backflow prevention assembly (3) is provided with a filtering assembly (4), the outer end of the filtering assembly (4) is provided with a plurality of heat storage assemblies (5) arranged at equal intervals in a circle, and the end, away from the filtering assembly (4), of the heat storage assembly (5) is connected with the dust backflow prevention assembly (3). The dust backflow prevention assembly (3) comprises a conveying pipe (301), a threaded groove (302) is formed in the left end of the conveying pipe (301), a plurality of reverse protrusions (304) are arranged at the right end of the threaded groove (302) and fixedly connected with the inner wall of the conveying pipe (301), the reverse protrusions (304) are distributed in a staggered mode, a narrow pipe (305) is arranged at the right end of the reverse protrusions (304), and an internally-threaded connecting pipe (303) is fixedly connected to the right end of the narrow pipe (305). The filtering assembly (4) comprises a filtering pipe (401), an externally-threaded connecting pipe (402) is fixedly connected to the left end of the filtering pipe (401), the externally-threaded connecting pipe (402) is screwed with the internally-threaded connecting pipe (303), a recovery pipeline (403) is fixedly connected to the right end of the filtering pipe (401), and a large-hole filter plate (404) and a small-hole filter plate (405) are sequentially arranged in the filtering pipe (401) from left to right. The heat storage assembly (5) comprises a heat preservation pipe (501), a pair of left-right symmetrical backflow pipes (506) are fixedly connected to the outer end of the heat preservation pipe (501), the left end of the backflow pipe (506) is communicated with the conveying pipe (301), the right end of the backflow pipe (506) is communicated with the filtering pipe (401), a heat storage block (502) is fixedly connected to the inner portion of the heat preservation pipe (501), a heat conduction sheet (505) is fixedly connected to the inner end of the heat storage block (502), an inner pipe (504) is fixedly connected to the inner portion of the heat conduction sheet (505), and the inner pipe (504) is communicated with the heat preservation pipe (501).

2. A flue waste heat recovery device according to claim 1, characterised in that: The switch assembly (2) comprises a communicating pipe (202), a connecting ring (203) is fixedly connected to the left end of the communicating pipe (202) and screwed with the flue connecting pipe (1).

3. A flue heat recovery device according to claim 2, wherein: A screw rod (204) is rotatably connected to the top end of the communicating pipe (202), and a knob (205) is fixedly connected to the top end of the screw rod (204).

4. A flue heat recovery device according to claim 3, wherein: The bottom end of the screw rod (204) penetrates through the top end of the communicating pipe (202) and extends into the communicating pipe (202) and is fixedly connected with a plug (206), and the plug (206) is screwed with the threaded groove (302).

5. A flue heat recovery device according to claim 4, wherein: A flow channel matched with the plug (206) is formed in the inner portion of the communicating pipe (202).

6. A flue heat recovery device according to claim 1, wherein: A through hole matched with the backflow pipe (506) is formed in the outer wall of the conveying pipe (301) and outside the reverse protrusions (304).

7. A flue heat recovery device according to claim 1, wherein: The outer wall of the filter tube (401) is provided with a through hole adapted to the reflux tube (506) on the left side of the large-pore filter plate (404).

8. A flue heat recovery device according to claim 1, wherein: The heat-conducting sheet (505) is in the shape of a spiral.

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