Adjustable air duct type air return furnace

Abstract

The invention relates to the technical field of air return furnaces, and particularly discloses an adjustable air duct type air return furnace which comprises a furnace body and a smoke exhaust device communicated with the side edge of the furnace body. The furnace body comprises an outer cylinder which is vertically arranged and has a sealed lower end, an inner cylinder which is vertically arranged in the outer cylinder, and a cover plate which is detachably arranged at the upper end of the outer cylinder; the upper end face of the inner cylinder is lower than the upper end face of the outer cylinder; the smoke exhaust device comprises a smoke exhaust box, a smoke exhaust pipe arranged at the upper end of the side, away from the furnace body, of the smoke exhaust box, and an oven arranged in the middle of the smoke exhaust box. First through holes are formed in the side wall of the upper end of the outer cylinder; second through holes are formed in the side wall of the lower end of the outer cylinder; the first through hole and the second through hole are both communicated with the smoke exhaust box; and a valve is arranged at the first through hole. According to the adjustable air duct type air return furnace, smoke and hot air can be better guided to flow, and the heat utilization efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of return air furnaces, and more particularly to an adjustable air duct type return air furnace. Background Art

[0002] A return air furnace is a traditional household heating furnace. It is a heating device that burns coal or other biomass fuels for heating or cooking. It mainly includes a furnace body for heat insulation, and a furnace core is arranged inside the furnace body. Coal or biomass and other fuels are put into the furnace core and burned to generate heat, and the heat is dissipated outward through the furnace body to achieve the heating purpose.

[0003] When initially igniting the fuel, a certain amount of smoke will be generated in the traditional return air furnace, and the smoke usually directly discharges through the opening at the upper end of the return air furnace. After subsequent normal combustion, the smoke can be discharged through the exhaust pipe. This will cause the scene of smoke floating randomly in the initial ignition stage and is not conducive to the efficient ignition of the fuel. In addition, the hot air and smoke generated by the return air furnace will directly discharge through the exhaust pipe. Although the discharged heat also warms the surrounding environment, this also causes a certain degree of heat waste. Therefore, it is necessary to design a return air furnace that can be more efficiently ignited and can make full use of heat. Summary of the Invention

[0004] The purpose of the present invention is to provide an adjustable air duct type return air furnace, which can better guide the flow of smoke and hot air and improve the heat utilization efficiency.

[0005] The present invention is realized through the following technical solutions: The adjustable air duct type return air furnace of the present invention includes a furnace body and an exhaust device communicated with the side of the furnace body. The furnace body includes an outer cylinder vertically arranged with a closed lower end, an inner cylinder vertically arranged inside the outer cylinder, and a cover plate detachably arranged at the upper end of the outer cylinder. The height of the upper end surface of the inner cylinder is lower than the height of the upper end surface of the outer cylinder. The exhaust device includes an exhaust box, an exhaust pipe arranged at the upper end on the side of the exhaust box away from the furnace body, and an oven arranged in the middle of the exhaust box. A first through hole is opened on the side wall of the upper end of the outer cylinder, and a second through hole is opened on the side wall of the lower end of the outer cylinder. Both the first through hole and the second through hole are communicated with the exhaust box. A valve is arranged at the first through hole.

[0006] Further, the valve includes a baffle arranged at the exhaust box near the first through hole and a rotating shaft horizontally arranged under the baffle. The rotating shaft is arranged under the first through hole. The baffle is used to block the first through hole, and both ends of the rotating shaft are rotatably connected to the side wall of the exhaust box. When the baffle is in a horizontal state, the side of the baffle away from the first through hole is placed on the upper end part of the oven.

[0007] Further, one end of the rotating shaft is provided with a lever, and the axial direction of the lever is perpendicular to the axial direction of the rotating shaft.

[0008] Further, when the baffle is in a vertical state, the lever is located above the baffle and is arranged towards the furnace body; the angle between the lever and the horizontal plane is 0-90 degrees.

[0009] Further, a counterweight is provided at the end of the lever away from the rotating shaft.

[0010] Further, a sliding hole is opened at one end of the smoke exhaust box close to the smoke exhaust pipe, and a horizontally arranged cylinder with both ends sealed is rotatably arranged in the sliding hole; both ends of the cylinder are rotatably connected to the side wall of the smoke exhaust box, a smoke exhaust hole is opened on one side of the cylinder arranged inside the smoke exhaust box, and the smoke exhaust pipe is communicated with one side of the cylinder arranged outside the smoke exhaust box.

[0011] Further, a first telescopic plate is hinged to the inner top wall of the smoke exhaust box, and the other end of the first telescopic plate is hinged to the upper side of the smoke exhaust hole; a second telescopic plate is hinged to the inner side wall of the smoke exhaust box away from the furnace body, and the other end of the second telescopic plate is hinged to the lower side of the smoke exhaust hole.

[0012] Further, the structure of the first telescopic plate is the same as that of the second telescopic plate; the first telescopic plate includes a hollow sliding plate hinged to the inner wall of the smoke exhaust box and a sliding piece slidably arranged in the sliding plate; one end of the sliding plate close to the cylinder is an open end, and the end of the sliding piece away from the sliding plate is hinged to the upper side of the smoke exhaust hole.

[0013] Further, a ring-shaped connecting plate is provided at the upper end of the inner cylinder, and a plurality of ventilation holes are opened on the connecting plate; the connecting plate is arranged between the inner cylinder and the outer cylinder; the connecting plate is arranged below the first through hole.

[0014] Further, a horizontally arranged feed pipe is provided on one side of the furnace body away from the smoke exhaust box, and a horizontally arranged support plate is provided at the lower end of the inner cylinder; the feed pipe passes through the outer cylinder and the inner cylinder and is communicated with the inside of the inner cylinder; the height of the feed pipe is higher than the height of the support plate.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: In the process of using the adjustable air duct type return air furnace of the present invention, the fuel is placed in the inner cylinder and ignited, then the cover plate is covered, and the valve is opened, so that the outer cylinder communicates with the smoke exhaust box through the first through hole. At this time, the high-temperature smoke in the inner cylinder enters the smoke exhaust box through the first through hole and is finally discharged through the smoke exhaust pipe. This can effectively avoid a large amount of smoke directly overflowing from the upper end of the outer cylinder in the early stage of ignition, can well guide the direction of the smoke, and improve the ignition efficiency. After being fully ignited, the first through hole is closed by using the valve. At this time, the high-temperature air discharged from the inner cylinder will no longer enter the smoke exhaust box through the first through hole. And because there is a cover plate or other equipment to be heated at the upper end of the outer cylinder, the high-temperature gas will gradually move downward to the second through hole and enter the smoke exhaust box through the second through hole. After the high-temperature gas enters the smoke exhaust box, a part of it will flow upward, and a part will first flow to the lower side of the oven and then flow upward, and finally be discharged through the smoke exhaust pipe. In this way, the high-temperature gas can fully contact and cover the outer wall of the oven, fully heat the oven, and improve the utilization efficiency of heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the adjustable air duct type return air furnace provided by an embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of the adjustable air duct type return air furnace provided by an embodiment of the present invention after removing the cover plate;

[0018] Figure 3 is a schematic structural diagram of a state inside the adjustable air duct type return air furnace provided by an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of a second state inside the adjustable air duct type return air furnace provided by an embodiment of the present invention;

[0020] Figure 5 is a schematic structural diagram of the cylinder part provided by an embodiment of the present invention;

[0021] Figure 6 is a schematic structural diagram of the valve part provided by an embodiment of the present invention.

[0022] Reference numerals: 10 - furnace body, 11 - outer cylinder, 12 - inner cylinder, 13 - cover plate, 14 - first through hole, 15 - second through hole, 16 - connecting plate, 17 - ventilation hole, 18 - feed pipe, 19 - support plate, 20 - smoke exhaust device, 21 - smoke exhaust box, 22 - oven, 23 - smoke exhaust pipe, 24 - cylinder body, 25 - smoke exhaust hole, 26 - first telescopic plate, 261 - sliding plate, 262 - sliding piece, 27 - second telescopic plate, 30 - valve, 31 - baffle, 32 - rotating shaft, 33 - lever, 34 - counterweight. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Embodiment

[0024] The following further explains with specific embodiments. As shown in the attached Figure 1 - attached Figure 6 figures, the arrows in the attached figures indicate the flow direction of the gas. The adjustable air duct type return air furnace in this embodiment includes a furnace body 10 and a smoke exhaust device 20 communicated with the side of the furnace body 10; the furnace body 10 includes an outer cylinder 11 vertically arranged with a closed lower end, an inner cylinder 12 vertically arranged inside the outer cylinder 11, and a cover plate 13 detachably arranged at the upper end of the outer cylinder 11; the height of the upper end surface of the inner cylinder 12 is lower than the height of the upper end surface of the outer cylinder 11; the smoke exhaust device 20 includes a smoke exhaust box 21, a smoke exhaust pipe 23 arranged at the upper end of the side of the smoke exhaust box 21 away from the furnace body 10, and an oven 22 arranged in the middle of the smoke exhaust box 21; a first through hole 14 is opened on the side wall of the upper end of the outer cylinder 11, and a second through hole 15 is opened on the side wall of the lower end of the outer cylinder 11; both the first through hole 14 and the second through hole 15 are communicated with the smoke exhaust box 21; a valve 30 is arranged at the first through hole 14. Specifically, during use, fuel (such as wood, charcoal, etc.) is placed in the inner cylinder 12 and ignited, then the cover plate 13 is covered, and the valve 30 is opened, so that the outer cylinder 11 is communicated with the smoke exhaust box 21 through the first through hole 14. At this time, the high-temperature smoke in the inner cylinder 12 enters the smoke exhaust box 21 after passing through the first through hole 14, and finally is discharged through the smoke exhaust pipe 23 (as shown in the attached Figure 3 figures). In this way, it can effectively avoid a large amount of smoke directly overflowing from the upper end of the outer cylinder 11 in the early stage of ignition, can well guide the direction of the smoke, and improve the ignition efficiency. After being fully ignited, the first through hole 14 is closed by using the valve 30. At this time, the high-temperature air discharged from the inner cylinder 12 will no longer enter the smoke exhaust box 21 through the first through hole 14. And because there is a cover plate 13 or other equipment that needs to be heated at the upper end of the outer cylinder 11, the high-temperature gas will gradually move downward to the second through hole 15 and enter the smoke exhaust box 21 through the second through hole 15. After the high-temperature gas enters the smoke exhaust box 21, part of it will flow upward, and part of it will first flow to the lower side of the oven 22 (the oven 22 can be used for baking food, etc.), and then flow upward, and finally is discharged through the smoke exhaust pipe 23 (as shown in the attached Figure 4 figures). In this way, the high-temperature gas can fully contact and cover the outer wall of the oven 22, fully heat the oven 22, and improve the utilization efficiency of heat.

[0025] The valve 30 in this embodiment includes a baffle 31 provided near the first through hole 14 of the smoke exhaust box 21, and a rotating shaft 32 horizontally provided on the lower side of the baffle 31; the rotating shaft 32 is provided on the lower side of the first through hole 14, the baffle 31 is used to block the first through hole 14, and both ends of the rotating shaft 32 are rotatably connected to the side wall of the smoke exhaust box 21; when the baffle 31 is in a horizontal state, the side of the baffle 31 away from the first through hole 14 is placed on the upper end of the oven 22. One end of the rotating shaft 32 is provided with a lever 33, and the axis direction of the lever 33 is perpendicular to the axis direction of the rotating shaft 32. Specifically, when the baffle 31 is in a horizontal state (attached Figure 3 ), it can allow gas to pass through the first through hole 14. At this time, the baffle 31 can also block the gas below it, reducing or avoiding the amount of gas entering the smoke exhaust box 21 through the second through hole 15; when the baffle 31 is in a vertical state (attached Figure 4 ), it can block the first through hole 14. At this time, the gas below the baffle 31 can flow upward. The baffle 31 can be driven to rotate by rotating the lever 33.

[0026] In this embodiment, when the baffle 31 is in a vertical state, the lever 33 is located above the baffle 31 and is oriented towards the furnace body 10; the angle between the lever 33 and the horizontal plane is 0-90 degrees. A counterweight 34 is provided at the end of the lever 33 away from the rotating shaft 32. Specifically, when the baffle 31 is in a vertical state, the gravity of the counterweight 34 will cause the baffle 31 to tend to rotate to the left, which can prevent the baffle 31 from rotating to the right without external force.

[0027] One end of the smoke exhaust box 21 near the smoke exhaust pipe 23 is provided with a sliding hole, and a horizontally arranged cylinder body 24 with both ends sealed is rotatably provided in the sliding hole; both ends of the cylinder body 24 are rotatably connected to the side wall of the smoke exhaust box 21, and a smoke exhaust hole 25 is provided on one side of the cylinder body 24 arranged in the smoke exhaust box 21, and the smoke exhaust pipe 23 is communicated with the side of the cylinder body 24 arranged outside the smoke exhaust box 21. The inner top wall of the smoke exhaust box 21 is hinged with a first telescopic plate 26, and the other end of the first telescopic plate 26 is hinged to the upper side of the smoke exhaust hole 25; the inner side wall of the smoke exhaust box 21 away from the furnace body 10 is hinged with a second telescopic plate 27, and the other end of the second telescopic plate 27 is hinged to the lower side of the smoke exhaust hole 25. Specifically, the flow rate of the gas passing above and below the oven 22 can be adjusted by rotating the cylinder body 24. The principle is that, with attached Figure 3Taking the perspective of [description missing in the original, assuming it's a certain reference point] as an example, when the cylinder body 24 is rotated clockwise, the smoke exhaust hole 25 moves upward. At this time, it will drive the first telescopic plate 26 away from the oven 22 and drive the second telescopic plate 27 closer to the oven 22. That is, the flowable space above the oven 22 becomes larger, and the flowable space below the oven 22 becomes smaller. Then, more hot air will gather above the oven 22, heating the upper part of the oven 22 with higher efficiency. On the contrary, when the cylinder body 24 is rotated counterclockwise, the opposite effect will occur, that is, the lower part of the oven 22 is fully heated. Therefore, it can be efficiently adjusted according to the items to be baked in the oven 22.

[0028] In this embodiment, the structure of the first telescopic plate 26 is the same as that of the second telescopic plate 27; the first telescopic plate 26 includes a hollow sliding plate 261 hinged to the inner wall of the smoke exhaust box 21, and a sliding piece 262 slidably disposed in the sliding plate 261; one end of the sliding plate 261 close to the cylinder body 24 is an open end, and one end of the sliding piece 262 away from the sliding plate 261 is hinged to the upper side of the smoke exhaust hole 25.

[0029] In this embodiment, a ring-shaped connecting plate 16 is provided at the upper end of the inner cylinder 12. A plurality of air permeation holes 17 are opened on the connecting plate 16; the connecting plate 16 is disposed between the inner cylinder 12 and the outer cylinder 11; the connecting plate 16 is disposed below the first through hole 14. Specifically, the function of the connecting plate 16 is to strengthen the connection strength between the inner cylinder 12 and the outer cylinder 11, and the air permeation holes 17 are opened on the connecting plate 16 for the normal flow of gas.

[0030] In this embodiment, a horizontally arranged feed pipe 18 is provided on one side of the furnace body 10 away from the smoke exhaust box 21, and a horizontally arranged support plate 19 is provided at the lower end of the inner cylinder 12; the feed pipe 18 passes through both the outer cylinder 11 and the inner cylinder 12 and then communicates with the inside of the inner cylinder 12; the height of the feed pipe 18 is higher than the height of the support plate 19. Specifically, the feed pipe 18 is provided to facilitate the input of new fuel or the removal of ash, and the support plate 19 can be used to support the fuel.

[0031] In summary, during the use of the adjustable air duct type return air furnace of this embodiment, the fuel is placed in the inner cylinder 12 and ignited, then the cover plate 13 is covered, and the valve 30 is opened, so that the outer cylinder 11 communicates with the smoke exhaust box 21 through the first through hole 14. At this time, the high-temperature smoke in the inner cylinder 12 enters the smoke exhaust box 21 through the first through hole 14 and is finally discharged through the smoke exhaust pipe 23. In this way, it can effectively avoid a large amount of smoke directly overflowing from the upper end of the outer cylinder 11 in the early stage of ignition, can well guide the flow direction of the smoke, and improve the ignition efficiency. After sufficient ignition, the first through hole 14 is closed by using the valve 30. At this time, the high-temperature air discharged from the inner cylinder 12 will no longer enter the smoke exhaust box 21 through the first through hole 14. Also, since the upper end of the outer cylinder 11 is provided with a cover plate 13 or other equipment that needs to be heated, the high-temperature gas will gradually move downward to the second through hole 15 and enter the smoke exhaust box 21 through the second through hole 15. After the high-temperature gas enters the smoke exhaust box 21, a part will flow upward, a part will first flow to the lower side of the oven 22, and then flow upward, and finally be discharged through the smoke exhaust pipe 23. In this way, the high-temperature gas can fully contact and cover the outer wall of the oven 22, fully heat the oven 22, and improve the utilization efficiency of heat.

[0032] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An adjustable duct type return air furnace, characterized in that: It comprises a furnace body (10), and a smoke exhaust device (20) connected to the side of the furnace body (10); The furnace body (10) comprises an outer cylinder (11) which is vertically arranged and sealed at the lower end, an inner cylinder (12) which is vertically arranged inside the outer cylinder (11), and a cover plate (13) which is detachably arranged at the upper end of the outer cylinder (11); the height of the upper end surface of the inner cylinder (12) is lower than the height of the upper end surface of the outer cylinder (11); The smoke exhaust device (20) comprises a smoke exhaust box (21), a smoke exhaust pipe (23) arranged at the upper end of the smoke exhaust box (21) away from the furnace body (10), and an oven (22) arranged in the middle of the smoke exhaust box (21); a first through hole (14) is formed on the upper side wall of the outer cylinder (11), and a second through hole (15) is formed on the lower side wall of the outer cylinder (11); the first through hole (14) and the second through hole (15) are both connected to the smoke exhaust box (21); and a valve (30) is provided at the first through hole (14).

2. The adjustable duct type return air furnace according to claim 1, characterized in that: The valve (30) comprises a baffle (31) arranged on the smoke exhaust box (21) near the first through hole (14), and a rotating shaft (32) arranged horizontally on the lower side of the baffle (31); The rotating shaft (32) is arranged at the lower side of the first through hole (14), the baffle (31) is used to cover the first through hole (14), and both ends of the rotating shaft (32) are rotatably connected to the side wall of the smoke exhaust box (21); When the baffle (31) is in a horizontal state, the side of the baffle (31) away from the first through hole (14) is laid on the upper end of the oven (22).

3. The adjustable duct type return air furnace according to claim 2, characterized in that: A shifting rod (33) is provided at one end of the rotating shaft (32), and the axial direction of the shifting rod (33) is perpendicular to the axial direction of the rotating shaft (32).

4. The adjustable duct type return air furnace according to claim 3 is characterized in that: When the baffle (31) is in a vertical state, the lever (33) is located above the baffle (31) and is arranged toward the furnace body (10); the angle between the lever (33) and the horizontal plane is 0-90 degrees.

5. The adjustable duct type return air furnace according to claim 4, characterized in that: A counterweight block (34) is provided at one end of the lever (33) away from the rotating shaft (32).

6. The adjustable duct type return air furnace according to claim 1, characterized in that: The smoke exhaust box (21) is provided with a sliding hole at one end close to the smoke exhaust pipe (23), and a cylinder (24) which is horizontally arranged and sealed at both ends is rotatably arranged in the sliding hole; Both ends of the cylinder (24) are rotatably connected to the side walls of the smoke exhaust box (21); a smoke exhaust hole (25) is provided on one side of the cylinder (24) disposed inside the smoke exhaust box (21); and the smoke exhaust pipe (23) is connected to a side of the cylinder (24) disposed outside the smoke exhaust box (21).

7. The adjustable duct type return air furnace according to claim 6, characterized in that: A first telescopic plate (26) is hingedly provided on the inner top wall of the smoke exhaust box (21), and the other end of the first telescopic plate (26) is hingedly connected to the upper side of the smoke exhaust hole (25); The inner side wall of the smoke exhaust box (21) away from the furnace body (10) is hingedly provided with a second telescopic plate (27), and the other end of the second telescopic plate (27) is hingedly connected to the lower side of the smoke exhaust hole (25).

8. The adjustable duct type return air furnace according to claim 7, characterized in that: The structure of the first telescopic plate (26) is the same as that of the second telescopic plate (27); The first telescopic plate (26) comprises a hollow slide plate (261) hinged to the inner wall of the smoke exhaust box (21), and a slide plate (262) slidably arranged in the slide plate (261); an end of the slide plate (261) close to the cylinder (24) is an open end, and an end of the slide plate (262) away from the slide plate (261) is hinged to the upper side of the smoke exhaust hole (25).

9. The adjustable duct type return air furnace according to claim 1, characterized in that: An annular connecting plate (16) is provided at the upper end of the inner cylinder (12), and a plurality of air holes (17) are provided on the connecting plate (16); the connecting plate (16) is arranged between the inner cylinder (12) and the outer cylinder (11); and the connecting plate (16) is arranged below the first through hole (14).

10. The adjustable duct type return air furnace according to claim 1, characterized in that: A horizontally arranged feed pipe (18) is provided on a side of the furnace body (10) away from the smoke exhaust box (21), and a horizontally arranged support plate (19) is provided at the lower end of the inner tube (12); The feed pipe (18) passes through the outer cylinder (11) and the inner cylinder (12) at the same time and is communicated with the interior of the inner cylinder (12); the height of the feed pipe (18) is higher than the height of the support plate (19).

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