A thermal blocking device and method for the barrel wall of a long-distance smoke exhaust pipe

Abstract

The present application discloses a heat blocking device and method for the barrel wall of a long-distance smoke exhaust pipe. The heat blocking device for the barrel wall of the long-distance smoke exhaust pipe includes a fan, a microcomputer, a primary heat blocking channel arranged on the outer side of the barrel wall of the smoke exhaust pipe, and a secondary heat blocking channel arranged on the outer side of the barrel wall of the primary heat blocking channel; the air inlets of the primary heat blocking channel and the secondary heat blocking channel are respectively a primary inlet and a secondary inlet, and the primary heat blocking channel includes a porous heat insulation material and a spiral blade; the secondary heat blocking channel includes a supply cold air flow main pipe, an air supply pipe, a spiral nozzle and a first electromagnetic flow valve; a first temperature monitor is arranged on the inner side of the barrel wall of the primary heat blocking channel, and the microcomputer is configured to send a first flow rate adjustment instruction to the first electromagnetic flow valve by analyzing the relationship between the first temperature monitor and a preset temperature. The technical solution of the present application achieves a good heat blocking effect and avoids heat exposure.

Description

Technical Field

[0001] This application relates to the field of cooling technology, and particularly to a thermal blocking device and method for the barrel wall of a long-distance smoke exhaust pipe. Background Art

[0002] During the operation of a diesel engine unit, the flue gas discharged has an extremely high temperature. The high-temperature fluid in the smoke exhaust pipe will radiate infrared light, thus reducing the concealment.

[0003] Currently, most of the thermal stealth of the barrel wall of a long-distance smoke exhaust pipe is a single-layer cooling structure. With the increase of the thermal load and exhaust temperature of the diesel engine unit, the limited amount of cold air cannot cool the barrel wall of the smoke exhaust pipe throughout the process, especially the thermal stealth is worse at a farther distance from the inlet of the barrel wall. Therefore, the temperature difference between the cooled barrel wall of the smoke exhaust pipe and the surrounding environment is still large, and it is impossible to avoid the tracking of infrared rays, resulting in a risk of thermal exposure. Summary of the Invention

[0004] By providing a thermal blocking device and method for the barrel wall of a long-distance smoke exhaust pipe in the embodiments of this application, the technical problem of poor thermal blocking effect of the barrel wall of the long-distance smoke exhaust pipe in the prior art is solved.

[0005] In a first aspect, the embodiments of this application provide a thermal blocking device for the barrel wall of a long-distance smoke exhaust pipe, including a fan, a microcomputer, a primary thermal blocking channel arranged on the outer side of the barrel wall of the smoke exhaust pipe, and a secondary thermal blocking channel arranged on the outer side of the barrel wall of the primary thermal blocking channel; the air inlets of the primary thermal blocking channel and the secondary thermal blocking channel are respectively a primary inlet and a secondary inlet, the fan is arranged below the primary inlet and the secondary inlet, and a cold fluid inlet is arranged below the fan; the primary thermal blocking channel includes a porous heat-insulating material and a spiral blade; the porous heat-insulating material is arranged on the outer side of the barrel wall of the smoke exhaust pipe, and the spiral blade is arranged at the primary inlet; the secondary thermal blocking channel includes a supply cold air main pipe, an air supply pipe, a spiral nozzle, and a first electromagnetic flow valve; the supply cold air main pipe is arranged at the secondary inlet, the first electromagnetic flow valve is arranged at the air inlet of the supply cold air main pipe, a plurality of the air supply pipes are arranged at the air outlet of the supply cold air main pipe, and the spiral nozzle is arranged at the air outlet of each air supply pipe. The spiral nozzle penetrates through the barrel wall of the primary thermal blocking channel and is configured to deliver a small cold fluid swirl to the primary thermal blocking channel; a first temperature monitor is arranged on the inner side of the barrel wall of the primary thermal blocking channel, and the microcomputer is configured to send a first flow rate adjustment instruction to the first electromagnetic flow valve by analyzing the relationship between the first temperature monitor and a preset temperature.

[0006] In combination with the first aspect, in a possible implementation, the heat blocking device of the barrel wall of the long-distance smoke exhaust pipe further includes the three-stage heat blocking channel; the three-stage heat blocking channel is arranged on the outer side of the barrel wall of the second-stage heat blocking channel, and the three-stage heat blocking channel is a closed structure; a phase change grid is arranged in the three-stage heat blocking channel, and phase change capsule bodies are arranged in the phase change grid; an outer circulation channel is arranged on the outer side of the barrel wall of the three-stage heat blocking channel, and third electromagnetic flow valves are arranged at both the inlet and the outlet of the outer circulation channel; a second temperature monitor is arranged on the side wall of the second-stage heat blocking channel away from the first-stage heat blocking channel, and the microcomputer is further configured to send a third flow rate adjustment instruction to the third electromagnetic flow valve by analyzing the relationship between the second temperature monitor and a preset temperature.

[0007] In combination with the first aspect, in a possible implementation, the phase change capsule bodies are distributed from sparse to dense along a first direction.

[0008] In combination with the first aspect, in a possible implementation, the spiral nozzle and the air supply pipe are distributed from sparse to dense in a spiral shape along a first direction.

[0009] In combination with the first aspect, in a possible implementation, the plurality of first temperature monitors and the second temperature monitor are arranged along a first direction and are distributed from sparse to dense.

[0010] In combination with the first aspect, in a possible implementation, the second-stage heat blocking channel further includes a second electromagnetic flow valve; the second electromagnetic flow valves are all arranged at the air inlet of the air supply pipe, and the microcomputer is further configured to send a second flow rate adjustment instruction to the second electromagnetic flow valve by analyzing the relationship between the first temperature monitor and a preset temperature.

[0011] In combination with the first aspect, in a possible implementation, a plurality of air chambers are arranged above the fan; the air chambers are respectively located below the first-stage inlet and the second-stage inlet and are configured to blow cold air into the interiors of the first-stage heat blocking channel and the second-stage heat blocking channel.

[0012] In combination with the first aspect, in a possible implementation, the inner cylinder of the smoke exhaust pipe and the first-stage heat blocking channel are both frustum-shaped that gradually expand along a first direction.

[0013] In combination with the first aspect, in a possible implementation, the porous heat insulation material is a bionic fiber porous heat insulation material.

[0014] In a second aspect, an embodiment of the present application provides a heat blocking method for a heat blocking device of the wall of a long-distance smoke exhaust chimney, including cold fluid entering the first-stage inlet and the second-stage inlet through a cold fluid inlet; the cold fluid forms a swirling cold fluid in the first-stage heat blocking channel under the action of a fan through spiral blades; a small amount of the swirling cold fluid flows into the porous structure of the porous heat insulation material; when the temperature detected by the first temperature monitor is higher than a preset temperature, the microcomputer sends a first flow rate adjustment instruction to the first electromagnetic flow valve, and the cold fluid enters the second-stage heat blocking channel through the action of the fan via a replenishing cold air main pipe and an air supply pipe; the cold fluid is transported to the first-stage heat blocking channel as small cold fluid swirls through spiral nozzles, forming a double swirling cold fluid.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] An embodiment of the present application provides a heat blocking device for the wall of a long-distance smoke exhaust chimney, including a fan, a microcomputer, a first-stage heat blocking channel arranged on the outer side of the wall of the smoke exhaust chimney, and a second-stage heat blocking channel arranged on the outer side of the wall of the first-stage heat blocking channel. First, cold fluid enters the first-stage inlet and the second-stage inlet through the cold fluid inlet, and the cold fluid forms a swirling cold fluid in the first-stage heat blocking channel under the action of the fan through spiral blades, and a small amount of the swirling cold fluid flows into the pores of the porous heat insulation material. Secondly, when the temperature detected by the first temperature monitor is higher than the preset temperature, the microcomputer sends a first flow rate adjustment instruction to the first electromagnetic flow valve, which can open the first electromagnetic flow valve and adjust the flow rate of the first electromagnetic flow valve, and the cold fluid enters the second-stage heat blocking channel through the action of the fan via a replenishing cold air main pipe and an air supply pipe. Finally, the cold fluid is transported to the first-stage heat blocking channel as small cold fluid swirls through spiral nozzles, forming a double swirling cold fluid. Through the first-stage and second-stage heat blocking channels, the temperature of the wall of the smoke exhaust chimney and the external environment can be effectively thermally insulated. Therefore, the heat blocking device for the wall of the long-distance smoke exhaust chimney in the embodiment of the present application has good heat blocking effect, simple structure, and avoids heat exposure. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. Obviously, the drawings in the following description are 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.

[0018] Figure 1 It is a schematic structural diagram of a heat blocking device for the wall of a long-distance smoke exhaust chimney provided by an embodiment of the present application;

[0019] Figure 2 It is a schematic plan view of the distribution of spiral nozzles provided by an embodiment of the present application;

[0020] Figure 3 It is a schematic plan view of the distribution of the phase change capsule bodies provided by the embodiment of the present application;

[0021] Figure 4 It is a control schematic diagram of the microcomputer provided by the embodiment of the present application.

[0022] Reference numerals: 1 - primary heat blocking channel; 11 - porous heat insulation material; 12 - spiral blade; 13 - first temperature monitor; 14 - primary inlet; 2 - secondary heat blocking channel; 21 - main supply cold air flow pipe; 22 - first electromagnetic flow valve; 23 - second electromagnetic flow valve; 24 - air supply pipe; 25 - spiral nozzle; 26 - second temperature monitor; 27 - secondary inlet; 3 - tertiary heat blocking channel; 31 - phase change capsule body; 32 - phase change grid; 33 - external circulation channel; 34 - third electromagnetic flow valve; 4 - smoke exhaust pipe; 5 - fan; 51 - air bin; 6 - cold fluid inlet; 7 - hot fluid; 8 - microcomputer. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0024] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installation", "connection", "connection" should 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, a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0025] The heat blocking device for the barrel wall of the long - distance smoke exhaust pipe provided by the embodiment of the present application is as Figures 1 to 4 shown. Figure 1 It is a structural schematic diagram of the heat blocking device for the barrel wall of the long - distance smoke exhaust pipe provided by the embodiment of the present application,Figure 2 A schematic plan view of the spiral nozzle distribution provided by the embodiment of the present application, Figure 3 A schematic plan view of the phase change capsule body distribution provided by the embodiment of the present application, Figure 4 A control schematic diagram of the microcomputer provided by the embodiment of the present application.

[0026] As Figure 1 shown, the heat blocking device for the barrel wall of the long-distance smoke exhaust pipe provided by the embodiment of the present application includes a fan 5, a microcomputer 8, a first-stage heat blocking channel 1 arranged on the outer side of the barrel wall of the smoke exhaust pipe 4, and a second-stage heat blocking channel 2 arranged on the outer side of the barrel wall of the first-stage heat blocking channel 1. The air inlets of the first-stage heat blocking channel 1 and the second-stage heat blocking channel 2 are a first-stage inlet 14 and a second-stage inlet 27 respectively. The fan 5 is arranged below the first-stage inlet 14 and the second-stage inlet 27, and a cold fluid inlet 6 is arranged below the fan 5.

[0027] Exemplarily, the embodiment of the present application provides a specific structural form of the first-stage heat blocking channel 1 in Figure 1 . The first-stage heat blocking channel 1 includes a porous heat insulation material 11 and a spiral blade 12. The porous heat insulation material 11 is arranged on the outer side of the barrel wall of the smoke exhaust pipe 4, and the spiral blade 12 is arranged at the first-stage inlet 14.

[0028] The cold fluid in the environment forms a swirling cold fluid in the first-stage heat blocking channel 1 through the spiral blade 12 under the action of the fan 5. During the flow of the swirling cold fluid, a small amount of cold fluid flows into the pores of the porous heat insulation material 11. Due to the large flow resistance of the porous structure, the swirling cold fluid flows almost non-swirlingly in the porous structure, pre-cooling the heat dissipated by the inner barrel of the smoke exhaust pipe 4. At the same time, the porous heat insulation material 11 with its low thermal conductivity can effectively isolate heat. A large amount of swirling cold fluid flows in the first-stage heat blocking channel 1 to form a cold fluid film layer, effectively isolating heat and enhancing the cooling effect.

[0029] Continue to refer to Figure 1As shown in the figure, the secondary heat blocking channel 2 includes a supply cold air flow main pipe 21, an air supply pipe 24, a spiral nozzle 25, and a first electromagnetic flow valve 22. The supply cold air flow main pipe 21 is arranged at the secondary inlet 27, the first electromagnetic flow valve 22 is arranged at the air inlet of the supply cold air flow main pipe 21, a plurality of air supply pipes 24 are arranged at the air outlet of the supply cold air flow main pipe 21, and a spiral nozzle 25 is arranged at the air outlet of each air supply pipe 24. The spiral nozzle 25 penetrates through the barrel wall of the primary heat blocking channel 1 and is configured to convey a small swirl of cold fluid to the primary heat blocking channel 1. The cold air flow main pipe 21 is a bypass pipe of the primary heat blocking channel 1 and is connected to a plurality of air supply pipes 24. The spiral nozzles 25 are located at different positions on the barrel wall of the primary heat blocking channel 1, which helps to form a small swirl of cold fluid, enter the primary heat blocking channel 1, form a double swirl with the swirling cold fluid, effectively isolate the heat, and enhance the cooling effect.

[0030] In the embodiment of the present application, a first temperature monitor 13 is arranged on the inner side of the barrel wall of the primary heat blocking channel 1, and the microcomputer 8 is configured to send a first flow rate adjustment instruction to the first electromagnetic flow valve 22 by analyzing the relationship between the first temperature monitor 13 and a preset temperature.

[0031] The barrel body of the long-distance smoke exhaust pipe 4 is relatively long, and the heat insulation effect of the primary heat blocking channel 1 on its barrel wall is limited. Especially at a location far from the inlet, the heat blocking effect is poor. A first temperature monitor 13 is arranged on the inner side of the barrel wall of the primary heat blocking channel 1. The microcomputer 8 analyzes the relationship between the first temperature monitor 13 on the barrel wall of the primary heat blocking channel 1 and the preset temperature, and sends a first flow rate adjustment instruction to the first electromagnetic flow valve 22, which can open the first electromagnetic flow valve 22 and adjust the flow rate of the first electromagnetic flow valve 22.

[0032] The high-temperature hot fluid 7 continuously flows through the exhaust stack 4. The heat of the hot fluid 7 is insulated by the heat-blocking device on the wall of the long-distance exhaust stack in the embodiment of the present application, so as to achieve the thermal stealth of the exhaust stack 4 in the environment and avoid thermal exposure. The cold fluid enters the first-stage inlet 14 and the second-stage inlet 27 through the cold-fluid inlet 6. Under the action of the fan 5, the cold fluid forms a swirling cold fluid in the first-stage heat-blocking channel 1 through the spiral blade 12, and a small amount of the swirling cold fluid flows into the porous structure of the porous heat-insulating material 11. When the temperature detected by the first temperature monitor 13 is higher than the preset temperature, the microcomputer 8 sends a first flow-rate adjustment command to the first electromagnetic flow valve 22. The cold fluid enters the second-stage heat-blocking channel 2 through the supply cold-air main pipe 21 and the air supply pipe 24 under the action of the fan 5. The cold fluid is transported to the first-stage heat-blocking channel 1 as a small cold-fluid swirl through the spiral nozzle 25, forming a double swirling cold fluid. After passing through the first-stage heat-blocking channel 1 and the second-stage heat-blocking channel 2, the temperature of the wall of the exhaust stack 4 can be effectively thermally isolated from the external environment. The small cold-fluid swirl merges along the tangent of the swirling cold fluid, which can avoid momentum loss and enhance the cooling effect, thus achieving heat blocking and avoiding thermal exposure.

[0033] As Figure 1 shown, the heat-blocking device on the wall of the long-distance exhaust stack provided in the embodiment of the present application further includes a third-stage heat-blocking channel 3. The third-stage heat-blocking channel 3 is arranged on the outer side of the wall of the second-stage heat-blocking channel 2, and the third-stage heat-blocking channel 3 is a closed structure. A phase-change grid 32 is arranged in the third-stage heat-blocking channel 3, and a phase-change capsule 31 is arranged in the phase-change grid 32. An external circulation channel 33 is arranged on the outer side of the wall of the third-stage heat-blocking channel 3, and third electromagnetic flow valves 34 are arranged at both the inlet and the outlet of the external circulation channel 33. A second temperature monitor 26 is arranged on the side wall of the second-stage heat-blocking channel 2 away from the first-stage heat-blocking channel 1, and the microcomputer 8 is further configured to send a third flow-rate adjustment command to the third electromagnetic flow valve 34 by analyzing the relationship between the second temperature monitor 26 and the preset temperature.

[0034] Through the primary heat blocking channel 1 and the secondary heat blocking channel 2, the temperature of the tube wall of the smoke exhaust pipe 4 can be effectively thermally isolated from the external environment. If in extreme operating conditions, such as the temperature of the high-temperature hot fluid 7 suddenly rises sharply or the cooling effect of the primary heat blocking channel 1 and the secondary heat blocking channel 2 partially or completely fails, the smoke exhaust pipe 4 will have a great risk of heat exposure. If the above situation occurs, when the microcomputer 8 detects that the temperature of the tube wall of the secondary heat blocking channel 2 is too high, it will close the third electromagnetic flow valve 34 at the entrance and exit of the external circulation channel 33, cut off the external circulation channel 33 connecting the tertiary heat blocking channel 3 with the outdoor environment, and the phase change capsule body 31 in the tertiary heat blocking channel 3 will melt and absorb heat after being heated, thereby achieving heat blocking and avoiding heat exposure. When the cooling effect of the secondary heat blocking channel 2 is restored, the microcomputer 8 opens the third electromagnetic flow valve 34 at the entrance and exit of the external circulation channel 33, and the phase change capsule body 31 in the tertiary heat blocking channel 3 solidifies.

[0035] like Figure 2 As shown, in one implementation of the embodiment of the present application, the phase change capsules 31 are distributed from sparse to dense along the first direction. The phase change capsules 31 are distributed in a sparse to dense manner according to the cooling characteristics. As the body of the smoke exhaust pipe 4 grows, especially when it is far away from the entrance, its heat blocking effect is poor. Therefore, in the embodiment of the present application, a denser phase change capsule 31 is arranged at a distance from the entrance of the body, which can accelerate the cooling effect, reduce the waste of resources, and avoid heat exposure.

[0036] like Figure 1 and Figure 3 As shown, the spiral nozzle 25 and the air supply pipe 24 are distributed in a spiral manner from sparse to dense along the first direction. The heat blocking device of the long-distance smoke exhaust pipe of the embodiment of the present application is distributed in a spiral manner. The spiral distribution is conducive to the coordinated mixing of the supply cold fluid and the swirling cold fluid. The supply cold fluid is introduced along the tangent of the swirling cold fluid to avoid momentum loss. The sparse and dense distribution is considered that the smoke exhaust pipe 4 is far away from the entrance, and its heat blocking effect is not good.

[0037] Continue to refer to Figure 1 As shown, a plurality of first temperature monitors 13 and second temperature monitors 26 are arranged along the first direction, and are distributed from sparse to dense. The sparse and dense distribution of the first temperature monitors 13 and the second temperature monitors 26 is also based on the characteristics of swirl cooling. For the first temperature monitors 13 and the second temperature monitors 26 that are farther away from the entrance of the smoke exhaust pipe 4, the arrangement is relatively denser, so that the flow rate of the corresponding supply cold fluid and more cooling measures can be better adjusted, the protection measures for heat exposure are strengthened, and the heat exposure of the high-temperature smoke exhaust pipe 4 wall in the outdoor environment is avoided.

[0038] Exemplarily, the secondary heat blocking channel 2 provided by the embodiments of the present application further includes a second electromagnetic flow valve 23. The second electromagnetic flow valves 23 are all arranged at the air inlet of the air supply pipe 24. The microcomputer 8 is further configured to send a second flow rate adjustment instruction to the second electromagnetic flow valve 23 by analyzing the relationship between the first temperature monitor 13 and the preset temperature. Each air supply pipe 24 connected to the spiral nozzle 25 is controlled by the second electromagnetic flow valve 23. When the temperature of the barrel wall of the primary heat blocking channel 1 is relatively high, all the second electromagnetic flow valves 23 can be opened; when the temperature of the barrel wall of the primary heat blocking channel 1 is not very high, some of the second electromagnetic flow valves 23 can be opened. The structural setting of the embodiments of the present application can avoid waste of resources and enhance the cooling effect.

[0039] As Figure 1 shown, a plurality of air chambers 51 are arranged above the fan 5. The air chambers 51 are respectively located below the primary inlet 14 and the secondary inlet 27, and are configured to blow cold air flow into the interiors of the primary heat blocking channel 1 and the secondary heat blocking channel 2. Corresponding air chambers 51 are arranged below the primary inlet 14 and the secondary inlet 27, which can conveniently and quickly blow cold fluid into the interiors of the primary heat blocking channel 1 and the secondary heat blocking channel 2.

[0040] In an implementation manner of the embodiments of the present application, both the smoke exhaust pipe 4 and the primary heat blocking channel 1 are frustum-shaped that gradually expand along the first direction. The high-temperature hot fluid 7 is discharged into the atmospheric environment through the smoke exhaust pipe 4. Due to the gradually expanding inner cylinder structure, near the outlets of the smoke exhaust pipe 4 and the primary heat blocking channel 1, under the action of pressure, more cold fluid at the outlets of the smoke exhaust pipe 4 and the primary heat blocking channel 1 can be entrained, forming the mixing of the cold fluid and the hot fluid 7, strengthening the cooling effect, and avoiding the heat exposure of the barrel wall of the high-temperature smoke exhaust pipe 4 in the outdoor environment.

[0041] Specifically, the porous heat insulation material 11 is a bionic fiber porous heat insulation material 11. The bionic fiber porous heat insulation material 11 has properties such as high porosity, high tensile strength, and high-efficiency heat insulation. The bionic fiber porous heat insulation material 11 is used as the primary heat blocking material, and the non-rotating cold fluid pre-cools the hot fluid 7 in the porous structure, reducing the initial temperature of the cold fluid entering the rotating cold fluid, and finally achieving the best comprehensive cooling effect of non-rotating cooling and rotating cooling.

[0042] An embodiment of the present application provides a method for heat blocking the barrel wall of a long-distance smoke exhaust pipe 4, which includes cold fluid entering the first-stage inlet 14 and the second-stage inlet 27 through the cold fluid inlet 6; the cold fluid forms a swirling cold fluid in the first-stage heat blocking channel 1 under the action of the fan 5 through the spiral blade 12; the cold fluid forms a swirling cold fluid in the first-stage heat blocking channel 1 through the spiral blade 12; a small amount of the swirling cold fluid flows into the porous structure of the porous heat insulation material 11; when the temperature detected by the first temperature monitor 13 is higher than the preset temperature, the microcomputer 8 sends a first flow rate adjustment instruction to the first electromagnetic flow valve 22, and the cold fluid enters the second-stage heat blocking channel 2 through the action of the fan 5 via the supply cold air main pipe 21 and the air supply pipe 24; the cold fluid is transported to the first-stage heat blocking channel 1 as a small cold fluid swirl through the spiral nozzle 25 to form a double swirling cold fluid.

[0043] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0044] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A heat blocking device for the barrel wall of a long-distance smoke exhaust pipe, characterized in that, It includes a fan (5), a microcomputer (8), a first-stage heat blocking channel (1) arranged on the outer side of the barrel wall of the smoke exhaust pipe (4), and a second-stage heat blocking channel (2) arranged on the outer side of the barrel wall of the first-stage heat blocking channel (1); The air inlets of the first-stage heat blocking channel (1) and the second-stage heat blocking channel (2) are respectively a first-stage inlet (14) and a second-stage inlet (27). The fan (5) is arranged below the first-stage inlet (14) and the second-stage inlet (27), and a cold fluid inlet (6) is arranged below the fan (5); The first-stage heat blocking channel (1) includes a porous heat insulation material (11) and a spiral blade (12); The porous heat insulation material (11) is arranged on the outer side of the barrel wall of the smoke exhaust pipe (4), and the spiral blade (12) is arranged at the first-stage inlet (14); The second-stage heat blocking channel (2) includes a supplementary cold air flow main pipe (21), a air supply pipe (24), a spiral nozzle (25) and a first electromagnetic flow valve (22); The supplementary cold air flow main pipe (21) is arranged at the second-stage inlet (27), the first electromagnetic flow valve (22) is arranged at the air inlet of the supplementary cold air flow main pipe (21), a plurality of the air supply pipes (24) are arranged at the air outlet of the supplementary cold air flow main pipe (21), and the spiral nozzle (25) is arranged at the air outlet of each air supply pipe (24). The spiral nozzle (25) penetrates through the barrel wall of the first-stage heat blocking channel (1) and is configured to convey a small cold fluid swirl to the first-stage heat blocking channel (1); A first temperature monitor (13) is arranged on the inner side of the barrel wall of the first-stage heat blocking channel (1). The microcomputer (8) is configured to send a first flow rate adjustment instruction to the first electromagnetic flow valve (22) by analyzing the relationship between the first temperature monitor (13) and a preset temperature.

2. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 1, characterized in that, It further includes a third-stage heat blocking channel (3); The third-stage heat blocking channel (3) is arranged on the outer side of the barrel wall of the second-stage heat blocking channel (2), and the third-stage heat blocking channel (3) is a closed structure; A phase change grid (32) is arranged in the third-stage heat blocking channel (3), and a phase change capsule body (31) is arranged in the phase change grid (32); An outer circulation channel (33) is arranged on the outer side of the barrel wall of the third-stage heat blocking channel (3), and third electromagnetic flow valves (34) are arranged at both the inlet and the outlet of the outer circulation channel (33); A second temperature monitor (26) is arranged on the side wall of the second-stage heat blocking channel (2) away from the first-stage heat blocking channel (1). The microcomputer (8) is further configured to send a third flow rate adjustment instruction to the third electromagnetic flow valve (34) by analyzing the relationship between the second temperature monitor (26) and a preset temperature.

3. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 2, characterized in that, The phase change capsule bodies (31) are distributed from sparse to dense along a first direction.

4. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 3, characterized in that, The spiral nozzles (25) and the air supply pipes (24) are distributed from sparse to dense in a spiral shape along the first direction.

5. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 4, characterized in that, A plurality of the first temperature monitors (13) and the second temperature monitors (26) are arranged along the first direction and are distributed from sparse to dense.

6. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 1 or 5, characterized in that, The secondary heat blocking channel (2) further includes a second electromagnetic flow valve (23); The second electromagnetic flow valves (23) are all arranged at the air inlet of the air supply duct, and the microcomputer (8) is further configured to send a second flow rate adjustment instruction to the second electromagnetic flow valve (22) by analyzing the relationship between the first temperature monitor (13) and a preset temperature.

7. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 1, characterized in that, A plurality of air chambers (51) are arranged above the fan (5); The air chambers (51) are respectively located below the primary inlet (14) and the secondary inlet (27), and are configured to blow cold air flow into the interiors of the primary heat blocking channel (1) and the secondary heat blocking channel (2).

8. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 1, characterized in that, Both the exhaust chimney (4) and the primary heat blocking channel (1) are frustum-shaped that gradually expands along the first direction.

9. The heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 1, characterized in that, The porous heat insulation material (11) is a bionic fiber porous heat insulation material.

10. The method of the heat blocking device for the barrel wall of a long-distance smoke exhaust pipe according to claim 1, characterized in that, Comprising: Cold fluid enters the primary inlet (14) and the secondary inlet (27) through the cold fluid inlet (6); The cold fluid forms a swirling cold fluid in the primary heat blocking channel (1) via the spiral blade (12) under the action of the fan (5); A small amount of the swirling cold fluid flows into the pores of the porous heat insulation material (11); When the temperature detected by the first temperature monitor (13) is higher than the preset temperature, the microcomputer (8) sends a first flow rate adjustment instruction to the first electromagnetic flow valve (22), and the cold fluid enters the secondary heat blocking channel (2) through the action of the fan (5) via the supplementary cold air flow main pipe (21) and the air supply duct (24); The cold fluid transports a small cold fluid swirl to the primary heat blocking channel (1) via the spiral nozzle (25), forming a double swirling cold fluid.

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