A waste heat convection recovery device for collecting furnace ash and steam-water mixture

Abstract

This invention relates to a waste heat convection recovery device for collecting furnace ash and a steam-water mixture, comprising: a heat exchange tower, which includes a base cylinder and an inner cylinder, wherein the inner cylinder is disposed within the base cylinder and is used to introduce furnace ash, while the base cylinder is used to introduce the steam-water mixture; and a heat exchange tube for introducing water, one end of which passes through the base cylinder and the inner cylinder and exits from both cylinders. The water exchanges heat with the furnace ash in the inner cylinder and the steam-water mixture in the base cylinder through the heat exchange tube. This waste heat convection recovery device for collecting furnace ash and a steam-water mixture is designed to utilize the furnace ash within the inner cylinder, and by utilizing the steam-water mixture generated during the operation of the biomass heating boiler, the furnace ash can continue to exchange heat even after the biomass heating boiler has ceased operation.

Description

Technical Field

[0001] This invention relates to the field of heat recovery technology for biomass heating boilers, specifically to a waste heat convection recovery device that integrates furnace ash and steam-water mixture. Background Technology

[0002] Biomass heating boilers use biomass energy as fuel. The biomass is directly ignited at the top of the furnace (top ignition, reverse combustion). The furnace temperature rises rapidly within a short time (3-5 minutes), reaching a certain high temperature where the biomass is gasified into combustible gas (also called volatile matter). This combustible gas is then burned again under secondary oxygen supply in the upper part of the furnace, generating a large amount of heat that is directly supplied from the top of the furnace. The lower layer of biomass continues to gasify and burn under high temperature conditions until combustion is complete. Because the combustible gas from the biomass is directly and completely burned under secondary oxygen supply, emissions are reduced, thermal efficiency is improved, and energy-saving and environmental protection requirements are met. These boilers are widely used in industries such as food, beverage, printing and dyeing, textiles, metallurgy, chemicals, tobacco, military, and pharmaceuticals.

[0003] Existing biomass heating boilers use steep-angle belt conveyors to transport steam generated during the combustion of biomass briquettes to hoppers. By employing waste heat convection devices to exchange heat through the steam convection, high-temperature gases are prevented from being directly discharged, thus achieving energy utilization and meeting energy conservation requirements.

[0004] After existing biomass heating boilers are put into use, although the bottom ash box collects the ash left after biomass combustion, the ash is not utilized after combustion. It usually takes several hours to completely dissipate the heat naturally. Since the residual heat is not directly utilized, energy is wasted. In order to utilize the ash and ensure that the ash can continue to exchange heat after the biomass heating boiler is stopped, a waste heat convection recovery device that integrates ash and steam-water mixture is proposed. Summary of the Invention

[0005] Based on the above description, the present invention provides a waste heat convection recovery device that integrates furnace ash and steam-water mixture, which solves the technical problems pointed out in the background art.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A waste heat convection recovery device for collecting furnace ash and a steam-water mixture, comprising: a heat exchange tower, which includes a base cylinder and an inner cylinder, wherein the inner cylinder is disposed in the base cylinder and is used to introduce furnace ash, and the base cylinder is used to introduce a steam-water mixture; the heat exchange tower also includes an outer cylinder, which is located outside the base cylinder and wraps around the base cylinder; a gap channel is formed between the base cylinder and the outer cylinder, wherein the gap channel is used to receive the steam-water mixture after heat exchange from the base cylinder; the steam-water mixture conducts heat to the base cylinder, accelerating the preheating in the base cylinder and forming a heat preservation zone; a partition is provided in the gap channel, which divides the gap channel into a furnace ash space and a ventilation space, wherein the furnace ash space is used for... The furnace ash is filled in, and the ventilation space is used to receive the steam-water mixture after heat exchange from the base cylinder. A first pipe is provided on the partition plate to connect the furnace ash space and the ventilation space. A first solenoid valve is provided on the outside of the first pipe to control the opening or closing of the first pipe. A heat exchange tube is used to introduce water. One end of the heat exchange tube passes through the base cylinder and the inner cylinder and exits from the inner cylinder and the base cylinder. The water exchanges heat with the furnace ash in the inner cylinder and the steam-water mixture in the base cylinder through the heat exchange tube. The steam-water mixture introduced from the base cylinder will first flow through the inner cylinder and then form a heat exchange with the heat exchange tube. The inner cylinder is a heat conductor. It absorbs the heat from the steam-water mixture introduced from the base cylinder, allowing the furnace ash to transfer heat continuously, and exchange heat with the water in the heat exchange tube through the furnace ash.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, it also includes an agitation structure, which is partially located in the inner cylinder. The base cylinder is equipped with a baffle. When the steam-water mixture flows from the base cylinder, the steam-water mixture will be guided through the baffle to drive the agitation structure to rotate and agitate the furnace ash.

[0009] Furthermore, the agitation structure includes a drive impeller and a stirring blade, wherein the drive impeller is connected to the stirring blade via a connecting shaft. The drive impeller is located on the outside of the inner cylinder, and the stirring blade is located inside the inner cylinder. When the soda-water mixture flows from the base cylinder, the drive impeller will drive the stirring blade to work via the connecting shaft.

[0010] Furthermore, the baffle includes a baffle plate and a flow guide edge. The included angle between the baffle plate and the flow guide edge is 135 degrees. A through hole is provided at the center of the baffle plate. The steam-water mixture is guided through the baffle plate and the flow guide edge to increase the convection time between the steam-water mixture and the heat exchange tube, and to drive the stirring structure to stir the furnace ash.

[0011] Furthermore, air holes are provided on both the baffle plate and the flow guide edge, and the diameter of the air holes is smaller than the diameter of the through holes.

[0012] Furthermore, a scraper is movably installed in the inner cylinder, which divides the inner cylinder into a solid space and a gas space. Under normal conditions, the scraper is limited by a locking structure, and the scraper completes the scraping action on the inner cylinder and heat exchange tubes through a mixture of gas and water.

[0013] Furthermore, the gas space is connected to the ventilation space through a second pipe. A second solenoid valve is provided on the outside of the second pipe to control the opening or closing of the second pipe. When the second pipe is open, the scraper is pressed downward. The gas space is connected to the ventilation space through a third pipe. A third solenoid valve is provided on the outside of the third pipe to control the opening or closing of the third pipe. When the third pipe is open, the scraper is pressed back to its original position.

[0014] Furthermore, the ventilation space is provided with a baffle structure to increase the convection time of the air-water mixture in the ventilation space;

[0015] The baffle structure includes several linearly distributed first baffles and second baffles, wherein the first baffles are disposed on the outer wall of the base cylinder and the second baffles are fixed on the inner wall of the outer cylinder.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0017] 1. The waste heat convection recovery device that integrates furnace ash and steam-water mixture is designed to utilize the furnace ash in the inner cylinder, and by utilizing the steam-water mixture generated during the operation of the biomass heating boiler, the furnace ash can continue to exchange heat after the biomass heating boiler stops.

[0018] 2. The waste heat convection recovery device for collecting furnace ash and steam-water mixture is designed with an outer cylinder to form an insulation zone and provides an additional heat exchange point for the steam-water mixture flowing out of the base cylinder, thereby improving energy utilization.

[0019] 3. The waste heat convection recovery device that collects furnace ash and steam-water mixture has a stirring structure and baffle design. When the steam-water mixture flows from the base cylinder, it drives the stirring structure to rotate, stirring the furnace ash and ensuring that the furnace ash in all places comes into contact with the heat exchange tube, thereby accelerating heat exchange.

[0020] 4. The waste heat convection recovery device that collects furnace ash and steam-water mixture is designed with a second and third through pipe, based on the design of the outer cylinder and other structures. This allows the gas pressure generated by the steam-water mixture to be used in conjunction with scrapers to clean the inner wall of the inner cylinder and the local outer wall of the heat exchange tubes.

[0021] 5. The waste heat convection recovery device for collecting furnace ash and steam-water mixture is designed with a baffle structure to guide the steam-water mixture to increase the convection time of the steam-water mixture in the ventilation space. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a waste heat convection recovery device for collecting furnace ash and steam-water mixture provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of a half-section structure according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure after the outer cylinder is hidden in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure after the outer cylinder and the base cylinder are hidden in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure when an agitation structure is provided in the inner cylinder in an embodiment of the present invention;

[0027] Figure 6 for Figure 2 A magnified view of a portion of region A in the middle;

[0028] Figure 7 for Figure 4 A magnified view of a portion of region B in the middle;

[0029] Figure 8 This is a schematic diagram of the structure when applied in an embodiment of the present invention;

[0030] Figure 9 This is a half-sectional schematic diagram of the partition and its connecting structure in an embodiment of the present invention.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Heat exchange tower; 11. Base cylinder; 111. Air inlet port; 112. Air outlet port; 12. Inner cylinder; 121. Ash inlet port; 122. Ash outlet port; 13. Outer cylinder; 131. Receiving port; 132. Exhaust port; 133. Ash receiving port; 134. Ash outlet port; 135. Connecting pipe; 14. Gap channel; 15. Baffle plate; 16. First through pipe; 17. Second through pipe; 18. Third through pipe; 19. Support component; 2 1. Heat exchange tube; 3. Stirring structure; 31. Drive impeller; 32. Stirring blade; 33. Connecting shaft; 4. Baffle; 41. Baffle plate; 42. Flow guide edge; 43. Through hole; 44. Air hole; 5. Scraper; 6. Locking structure; 61. Locking element; 62. Spring; 7. Baffle structure; 71. First baffle plate; 72. Second baffle plate; 8. Baffle ring; 9. Water collection cover; 91. Baffle; 92. Water inlet; 93. Water outlet. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] like Figure 1-4 ,as well as Figure 9 As shown in the figure, a waste heat convection recovery device for collecting furnace ash and steam-water mixture in this embodiment includes a heat exchange tower 1 and a heat exchange tube 2. The heat exchange tower 1 includes a base cylinder 11 and an inner cylinder 12. The inner cylinder 12 is supported and fixedly installed in the base cylinder 11 by a support member 19. Furnace ash is introduced into the inner cylinder 12, while the steam-water mixture is introduced into the base cylinder 11. Water is introduced into the heat exchange tube 2. The steam-water mixture and furnace ash are heat-conducted through the heat exchange tube 2 to complete the convection recovery of waste heat from the furnace ash and steam-water mixture.

[0035] Specifically, such as Figure 2 and Figure 9 As shown, one end of the heat exchange tube 2 is inserted into the base cylinder 11 and the inner cylinder 12, and exits from the inner cylinder 12 and the base cylinder 11. Water passes through the heat exchange tube 2 to exchange heat with the furnace ash in the inner cylinder 12 and the steam-water mixture in the base cylinder 11 through convection.

[0036] It should be noted that, as Figure 1 , Figure 2 and Figure 9 As shown, a water collection hood 9 is fixed to one side of the base cylinder 11 by bolts. The water collection hood 9 is divided into sections by baffles 91. A water inlet 92 is fixed to one side of the water collection hood 9 for water to enter. The water enters the heat exchange tube 2. A water outlet 93 is fixed to the other side of the water collection hood 9 for discharging the water after heat exchange. That is, water enters from the water inlet 92, passes through the heat exchange tube 2, completes heat exchange in the heat exchange tube 2, and finally flows out from the water outlet 93.

[0037] like Figure 1 and Figure 2 As shown, an air inlet 111 is provided on the outside of the base cylinder 11 for introducing a steam-water mixture flowing in from the biomass heating boiler. An air outlet 112 is provided on the outside of the base cylinder 11 for discharging the steam-water mixture after heat exchange. An ash inlet 121 is provided on the outside of the inner cylinder 12 for introducing furnace ash produced by the biomass heating boiler. An ash discharge outlet 122 is also fixed on the outside of the inner cylinder 12 for discharging the furnace ash in the inner cylinder 12.

[0038] It should be noted that the air inlet 111 is preferably located near the tail of the base cylinder 11, so that the steam-water mixture introduced from the base cylinder 11 will first flow through the inner cylinder 12 and then form a heat exchange with the heat exchange tube 2. The inner cylinder 12 is a heat conductor, such as copper, which absorbs the heat from the steam-water mixture introduced from the base cylinder 11, allowing the furnace ash to transfer heat continuously, and to exchange heat with the water in the heat exchange tube 2 through convection through the furnace ash.

[0039] Thus, during use, by utilizing the steam-water mixture generated during the operation of the biomass heating boiler, the furnace ash can continue to exchange heat even after the biomass heating boiler stops.

[0040] In addition, several linearly distributed baffles 8 are provided in the base cylinder 11 to increase the convection time between the steam-water mixture and the heat exchange tube 2.

[0041] In one embodiment, such as Figure 2 As shown, the heat exchange tower 1 also includes an outer cylinder 13, which is located outside the base cylinder 11 and wraps around the base cylinder 11. A gap channel 14 is formed between the base cylinder 11 and the outer cylinder 13. The gap channel 14 is used to receive the steam-water mixture after heat exchange from the base cylinder 11. At this time, the base cylinder 11 is a heat conductor, such as copper. The steam-water mixture conducts heat to the base cylinder 11, accelerating the preheating in the base cylinder 11 and forming a heat preservation zone.

[0042] It should be noted that, as Figure 1 As shown, a receiving interface 131 is fixed on one side of the outer cylinder 13, and an exhaust interface 132 fixed to the outer cylinder 13 is provided above the receiving interface 131, so that the exhaust interface 132 is the final discharge point of the soda-water mixture. Additionally, as... Figure 8 As shown, the receiving port 131 is connected to the air outlet port 112 via the connecting pipe 135, thereby receiving the steam-water mixture after heat exchange from the base cylinder 11.

[0043] Further explanation, such as Figure 2 , Figure 7 and Figure 9 As shown, a partition 15 is provided in the gap channel 14, which divides the gap channel 14 into a furnace ash space and a ventilation space. The furnace ash space is used to fill furnace ash, and the ventilation space is used to receive the steam-water mixture after heat exchange from the base cylinder 11. A first pipe 16 is provided on the partition 15 to connect the furnace ash space and the ventilation space. A first solenoid valve is provided on the outside of the first pipe 16 to control the opening or closing of the first pipe 16.

[0044] It should also be noted that an ash receiving interface 133 is provided on one side of the outer cylinder 13 for injecting furnace ash into the furnace ash space, and an ash discharge interface 134 is provided at the tail of the outer cylinder 13 for discharging furnace ash.

[0045] In use, after the ash in the ash space is discharged, the first solenoid valve can be opened so that the steam-water mixture for the next start can flow into the ash space from the first pipe 16 and finally flow out from the ash outlet 134. During this process, heat can also be conducted to the base cylinder 11 to accelerate the preheating in the base cylinder 11, so that the steam-water mixture can clean the ash remaining on the inner wall of the ash space.

[0046] Furthermore, a baffle structure 7 is provided in the ventilation space to increase the convection time of the air-water mixture in the ventilation space.

[0047] Specifically, the baffle structure 7 includes several linearly distributed first baffle plates 71 and second baffle plates 72, wherein the first baffle plates 71 are welded to the outer wall of the base cylinder 11, and the second baffle plates 72 are welded to the inner wall of the outer cylinder 13.

[0048] During use, as the soda-water mixture finally flows out from the exhaust port 132, it is guided by the first baffle 71 and the second baffle 72, allowing the soda-water mixture to travel a longer distance, thereby increasing the convection time of the soda-water mixture in the ventilation space.

[0049] In one embodiment, such as Figure 5 The waste heat convection recovery device for collecting furnace ash and steam-water mixture also includes an agitation structure 3, which is partially located in the inner cylinder 12. A baffle 4 is fixedly installed in the base cylinder 11 by bolts. When the steam-water mixture flows from the base cylinder 11, the steam-water mixture will be guided through the baffle 4 to drive the agitation structure 3 to rotate and agitate the furnace ash.

[0050] Specifically, the stirring structure 3 includes a drive impeller 31 and a stirring blade 32. The drive impeller 31 is connected to the stirring blade 32 through a connecting shaft 33. The drive impeller 31 is located outside the inner cylinder 12, and the stirring blade 32 is located inside the inner cylinder 12. When the soda-water mixture flows from the base cylinder 11, the drive impeller 31 will drive the stirring blade 32 to work through the connecting shaft 33.

[0051] The baffle 4 includes a baffle plate 41 and a flow guide edge 42. The included angle between the baffle plate 41 and the flow guide edge 42 is 135 degrees. A through hole 43 is provided at the center of the baffle plate 41. The steam-water mixture is guided through the baffle plate 41 and the flow guide edge 42 to increase the convection time between the steam-water mixture and the heat exchange tube 2, and to drive the stirring structure 3 to stir the furnace ash. Both the baffle plate 41 and the flow guide edge 42 are provided with air holes 44. The diameter of the air holes 44 is smaller than the diameter of the through hole 43, so that some gas can exchange heat with the heat exchange tube 2 in advance.

[0052] In use, the steam-water mixture is diverted through the baffle plate 41 and the guide edge 42, which in turn drives the impeller 31 to rotate better. The connecting shaft 33 drives the stirring blade 32 to work, thereby agitating the furnace ash and ensuring that the furnace ash in all places comes into contact with the heat exchange tube 2, thus accelerating heat exchange.

[0053] In another embodiment, a scraper 5 is movably disposed in the inner cylinder 12. The scraper 5 divides the inner cylinder 12 into a solid space and a gas space. Under normal conditions, the scraper 5 is limited by the locking structure 6, and the scraper 5 completes the scraping action on the inner cylinder 12 and the heat exchange tube 2 by the gas-water mixture.

[0054] Specifically, such as Figure 4 and Figure 7 As shown, the gas space is connected to the ventilation space through the second pipe 17. A second solenoid valve is provided on the outside of the second pipe 17 to control the opening or closing of the second pipe 17. When the second pipe 17 is open, the scraper 5 is pressed downward. The gas space is connected to the ventilation space through the third pipe 18. A third solenoid valve is provided on the outside of the third pipe 18 to control the opening or closing of the third pipe 18. When the third pipe 18 is open, the scraper 5 is pressed back to its original position.

[0055] And such Figure 2 and 6 As shown, the locking structure 6 includes a spring 62 and a locking member 61. An assembly cavity is provided on the inner wall of the inner cylinder 12. The spring 62 is fixed in the assembly cavity and connected to the locking member 61. A groove is provided on the outer side of the scraper 5. The scraper 5 is kept stationary under normal conditions by engaging with the locking member 61 through the groove.

[0056] When in use, after the receiving interface 131 receives the steam-water mixture after heat exchange from the base cylinder 11, the first and third solenoid valves are closed, and the exhaust interface 132 is closed. When the second solenoid valve is opened and the second passage pipe 17 is open, the scraper 5 will be pressed downward, thereby scraping off the furnace ash on the inner wall of the inner cylinder 12 and the outer wall of the heat exchange tube 2. When the first and second solenoid valves are closed, and the exhaust interface 132 is closed, and the third solenoid valve is opened and the third passage pipe 18 is open, the scraper 5 will be pressed back to its original position.

[0057] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A waste heat convection recovery device for collecting furnace ash and a mixture of steam and water, characterized in that, include: A heat exchange tower (1) includes a base cylinder (11) and an inner cylinder (12), wherein the inner cylinder (12) is disposed within the base cylinder (11) and is used to introduce furnace ash, while the base cylinder (11) is used to introduce a steam-water mixture. The heat exchange tower (1) also includes an outer cylinder (13), which is located outside the base cylinder (11) and encloses the base cylinder (11). A gap channel (14) is formed between the base cylinder (11) and the outer cylinder (13), wherein the gap channel (14) is used to receive the steam-water mixture after heat exchange from the base cylinder (11), and the steam-water mixture flows towards... The base cylinder (11) conducts heat, accelerates the preheating in the base cylinder (11), and forms a heat preservation zone. A partition (15) is provided in the gap channel (14), which divides the gap channel (14) into a furnace ash space and a ventilation space. The furnace ash space is used to fill furnace ash, and the ventilation space is used to receive the steam-water mixture after heat exchange from the base cylinder (11). A first pipe (16) is provided on the partition (15) to connect the furnace ash space and the ventilation space. A first solenoid valve is provided on the outside of the first pipe (16) to control the first pipe (16) to open or close. Heat exchange tube (2) is used to pass water through. One end of heat exchange tube (2) is inserted into the base cylinder (11) and the inner cylinder (12), and it passes out from the inner cylinder (12) and the base cylinder (11). Water passes through heat exchange tube (2) to exchange heat with the furnace ash in the inner cylinder (12) and the steam-water mixture in the base cylinder (11) respectively. The steam-water mixture introduced from the base cylinder (11) will first flow through the inner cylinder (12) and then form a heat exchange with the heat exchange tube (2). The inner cylinder (12) is a heat conductor, which absorbs the heat from the steam-water mixture introduced from the base cylinder (11), allowing the furnace ash to transfer heat continuously, and exchanging heat through the furnace ash to the water in the heat exchange tube (2) via convection.

2. The waste heat convection recovery device for collecting furnace ash and steam-water mixture according to claim 1, characterized in that: It also includes an agitation structure (3), which is partially located in the inner cylinder (12). A baffle (4) is provided in the base cylinder (11). When the steam-water mixture flows from the base cylinder (11), the steam-water mixture will be guided through the baffle (4) to drive the agitation structure (3) to rotate and agitate the furnace ash.

3. The waste heat convection recovery device for collecting furnace ash and steam-water mixture according to claim 2, characterized in that: The stirring structure (3) includes a drive impeller (31) and a stirring blade (32). The drive impeller (31) is connected to the stirring blade (32) via a connecting shaft (33). The drive impeller (31) is located outside the inner cylinder (12), and the stirring blade (32) is located inside the inner cylinder (12). When the steam-water mixture flows from the base cylinder (11), the drive impeller (31) will drive the stirring blade (32) to work via the connecting shaft (33).

4. The waste heat convection recovery device for collecting furnace ash and steam-water mixture according to claim 3, characterized in that: The baffle (4) includes a baffle plate (41) and a flow guide edge (42). The included angle between the baffle plate (41) and the flow guide edge (42) is 135 degrees. A through hole (43) is provided at the center of the baffle plate (41). The steam-water mixture is guided through the baffle plate (41) and the flow guide edge (42) to increase the convection time between the steam-water mixture and the heat exchange tube (2) and drive the stirring structure (3) to stir the furnace ash.

5. The waste heat convection recovery device for collecting furnace ash and steam-water mixture according to claim 4, characterized in that: Both the baffle plate (41) and the flow guide edge (42) are provided with air holes (44), and the diameter of the air holes (44) is smaller than the diameter of the through hole (43).

6. The waste heat convection recovery device for collecting furnace ash and steam-water mixture according to claim 5, characterized in that: The inner cylinder (12) is movably provided with a scraper (5). The scraper (5) divides the inner cylinder (12) into a solid space and a gas space. Under normal conditions, the scraper (5) is limited by the locking structure (6), and the scraper (5) completes the scraping action on the inner cylinder (12) and the heat exchange tube (2) by the steam-water mixture.

7. The waste heat convection recovery device for collecting furnace ash and steam-water mixture according to claim 6, characterized in that: The gas space is connected to the ventilation space through the second pipe (17). A second solenoid valve is provided on the outside of the second pipe (17) to control the second pipe (17) to open or close. When the second pipe (17) is open, the scraper (5) is pressed downward. The gas space is connected to the ventilation space through the third pipe (18). A third solenoid valve is provided on the outside of the third pipe (18) to control the third pipe (18) to open or close. When the third pipe (18) is open, the scraper (5) is pressed back to its original position.

8. The waste heat convection recovery device for collecting furnace ash and steam-water mixture according to claim 7, characterized in that: The ventilation space is provided with a baffle structure (7) to increase the convection time of the steam-water mixture in the ventilation space; The baffle structure (7) includes several linearly distributed first baffles (71) and second baffles (72), wherein the first baffles (71) are disposed on the outer wall of the base cylinder (11), and the second baffles (72) are fixed on the inner wall of the outer cylinder (13).

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