A heat recovery circulation fan for a cracking production line

Abstract

The present invention discloses a heat recovery circulation fan for a cracking production line, relating to the technical field of fans. The fan comprises a flow passage component, comprising a housing and an impeller disposed within the housing. The impeller comprises a front disc, blades, and a rear disc connected in sequence. The front disc air inlet provided on the front disc communicates with the housing air inlet provided on the housing via a tubular collector. The collector is provided with a sealing ring at one end proximate to the front disc, and the sealing ring is slidably connected to the collector via an elastic member. The front disc is provided with an open-ended surrounding tube at one end on a side proximate to the collector. The bottom of the surrounding tube is connected to the front disc, and the bottom of the surrounding tube is provided with an inner hole communicating with the front disc air inlet. The bottom of the surrounding tube cooperates with the sealing ring. The present invention can prevent secondary circulation of flue gas.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a heat recovery circulation fan for a cracking production line. Background Art

[0002] Pyrolysis technology is used in waste tires, oil sludge, waste fiberglass, and biomass processing. Pyrolysis technologies primarily include atmospheric pressure inert gas pyrolysis, vacuum pyrolysis, and molten salt pyrolysis. These technologies require heating the waste to 500-600°C, breaking it down into solid residues and high-temperature flue gas (500-600°C) containing hazardous volatile organic compounds such as dioxins. At this point, a heat recovery fan is needed to transport the high-temperature flue gas back to the pyrolysis kettle, reducing heat energy waste and achieving high-temperature flue gas recycling.

[0003] like Figure 1 As shown, the regenerative circulation fan includes a base 100, flow passage components, a bearing housing 200, a coupling 300, and a motor 400. The flow passage components include a housing 1 and an impeller 2 disposed within the housing 1. The housing 1, bearing housing 200, coupling 300, and motor 400 are all mounted on the upper end surface of the base 100. The motor 400 drives the impeller 2 via a drive shaft 500.

[0004] like Figure 4 As shown, the impeller 2 includes a front disc 2-1, blades 2-2, and a rear disc 2-3 that are welded and fixed in sequence. A hub 2-3-1 for cooperating with the transmission shaft 500 is riveted to the middle of the rear disc 2-3. There are multiple blades 2-2, and all blades 2-2 are radially distributed with the hub 2-3-1 as the center. Figure 5 As shown, the front disk air inlet 2-1-1 provided on the front disk 2-1 is connected to the casing air inlet 1-2-1 provided on the casing 1 through the collector 3, and the collector 3 is a tubular structure.

[0005] like Figure 5 As shown, the collector 3 is inserted into the front disk air inlet 2-1-1 at one end close to the front disk 2-1. Figure 4 As shown, on the one hand, since the impeller 2 is a rotating component and the collector 3 is a stationary component, in order to prevent the stationary collector 3 from hindering the rotation of the impeller 2, a gap δ is required between the collector 3 and the hole wall of the front disk air inlet hole 2-1-1; on the other hand, since the flue gas temperature can reach 500℃-600℃, in order to meet the thermal expansion deformation of the collector 3 and the front disk 2-1, a gap δ is required between the collector 3 and the hole wall of the front disk air inlet hole 2-1-1.

[0006] However, if Figure 4 and Figure 5As shown, the existence of the gap δ causes the flue gas flowing out of the impeller 2 outlet and entering the casing 1 to not immediately flow out from the casing air outlet provided on the casing 1, but to re-enter the impeller 2 through the gap δ between the hole wall of the front disk air inlet hole 2-1-1 and the collector 3, causing secondary circulation of the flue gas and reducing the efficiency of the heat recovery circulation fan.

[0007] Therefore, how to avoid the secondary circulation of flue gas is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0008] The present invention is aimed at the above-mentioned deficiencies in the prior art and provides a heat recovery circulation fan for a cracking production line. The present invention can avoid secondary circulation of flue gas.

[0009] To achieve the above objectives, the invention provides the following technical solutions:

[0010] A heat recovery circulation fan for a cracking production line includes a flow-through component, which includes a casing and an impeller arranged in the casing. The impeller includes a front disk, blades, and a rear disk connected in sequence. The front disk air inlet provided on the front disk is connected to the casing air inlet provided on the casing through a tubular structure collector. The collector is provided with a sealing ring at one end close to the front disk, and the sealing ring is slidably connected to the collector through an elastic member. The front disk is provided with a surrounding tube with one end open on the side close to the collector, the bottom of the surrounding tube is connected to the front disk, the bottom of the surrounding tube is provided with an inner hole connected to the front disk air inlet, and the bottom of the surrounding tube cooperates with the sealing ring.

[0011] Furthermore, the sealing ring is a copper ring.

[0012] Furthermore, the sealing ring is provided with a long guide hole, and the current collector is provided with a guide piece that cooperates with the long guide hole.

[0013] Furthermore, the front disc is provided with an inserting hole, and the blade is provided with an auxiliary blade matched with the inserting hole in the middle of a side close to the front disc.

[0014] Furthermore, the casing is provided with an inspection window, an inspection cover is provided in the inspection window, the inspection cover is connected to the casing, the inspection cover is provided with the casing air inlet, and a first supporting ring and a second supporting ring are provided between the inspection window and the inspection cover from the inside to the outside, one end of the first supporting ring is connected to the inspection cover, the first supporting ring is provided with a first flange at the end away from the inspection cover, one end of the second supporting ring is connected to the casing, the second supporting ring is provided with a second flange at the end away from the casing, the second flange is provided on the side of the first flange close to the first supporting ring, and the first flange is connected to the second flange; an insulation component and a sealing component are provided on the outside of the casing, the insulation component includes an insulation layer and a guard plate, and an insulation layer and a guard plate are provided on the outside of the casing and the outside of the inspection cover. The outer insulation layer is arranged between the second flange and the casing, and the insulation layer is provided with a first collector mounting hole connected to the air inlet hole of the casing, and the insulation layer is provided with an insulation layer shaft hole, and the insulation layer shaft hole is connected to the casing shaft hole provided on the casing, and the guard plate is provided with a second collector mounting hole connected to the first collector mounting hole, and the guard plate is provided with a guard plate shaft hole connected to the insulation layer shaft hole, and the second collector mounting hole, the first collector mounting hole, and the casing air inlet are all matched with the collector; the sealing assembly includes a sleeve, a sealing cover, a packing, and a pressure cover connected in sequence, and the sleeve is matched with the guard plate shaft hole, the insulation layer shaft hole, and the casing shaft hole from the outside to the inside, the sleeve is connected to the casing, the sealing cover is connected to the guard plate, and the sleeve, the sealing cover, the packing, and the pressure cover are all matched with the transmission shaft used to drive the impeller to rotate.

[0015] Furthermore, the insulation component also includes reinforcing ribs and fixing plates, which are both arranged in the insulation layer. One end of the reinforcing rib is connected to the casing, and the reinforcing rib is connected to the fixing plate at the end away from the casing. The guard plate is connected to the insulation layer and the fixing plate in sequence through fasteners.

[0016] Furthermore, a first sealing ring is provided between the first flange and the second flange, a second sealing ring is provided on a side of the casing away from the thermal insulation layer, and a pressure ring is provided on a side of the second sealing ring away from the casing.

[0017] Furthermore, the second flange is provided with a first nut on the side away from the first sealing ring, the second flange is provided with a second flange connecting hole, the first sealing ring is provided with a first sealing ring connecting hole, the first flange is provided with a first flange connecting hole, and the first flange is provided with a first bolt, and the first bolt is sequentially matched with the first flange connecting hole, the first sealing ring connecting hole, the second flange connecting hole, and the first nut; the casing is provided with a second bolt on the side close to the insulation layer, the casing is provided with a casing connecting hole, the second sealing ring is provided with a second sealing ring connecting hole, the pressure ring is provided with a pressure ring connecting hole, and the pressure ring is provided with a second nut on the side away from the second sealing ring, and the second bolt is sequentially matched with the casing connecting hole, the second sealing ring connecting hole, the pressure ring connecting hole, and the second nut.

[0018] Compared with the prior art, the beneficial effects of the invention are:

[0019] 1. The present invention enables the sealing ring to contact the bottom of the surrounding tube, thereby blocking the gap between the collector and the hole wall of the front disk air inlet hole, so that the flue gas flowing out of the impeller outlet and entering the casing will not re-enter the impeller through the gap between the hole wall of the front disk air inlet hole and the collector, avoiding the secondary circulation of the flue gas and improving the efficiency of the present invention.

[0020] Furthermore, since the bottom of the surrounding cylinder is only in contact with the sealing ring, the fixed collector does not rotate along with the impeller when the impeller rotates, thus preventing the collector from interfering with the rotation of the impeller.

[0021] Furthermore, since the sealing ring is located in the surrounding tube, the inner cavity of the surrounding tube can also provide deformation space for the sealing ring and the collector due to thermal expansion.

[0022] In addition, during the rotation of the impeller, the impeller will vibrate, which will cause the front disk to move closer to or further away from the collector. However, in the present invention, no matter whether the front disk is close to the collector or far away from the collector, the sealing ring can slide along the collector and always be in contact with the bottom of the surrounding tube. On the one hand, the reliability of the sealing ring blocking the gap between the collector and the hole wall of the front disk air inlet is guaranteed, and the reliability of avoiding secondary circulation of flue gas is improved, thereby further improving the efficiency of the present invention. On the other hand, since the sealing ring can slide along the collector no matter whether the front disk is close to the collector or far away from the collector, the mutual force between the sealing ring and the surrounding tube is reduced, thereby reducing the friction between the sealing ring and the surrounding tube, reducing the noise and vibration generated by the friction between the sealing ring and the surrounding tube, and improving the stability of the impeller rotation, thereby making the operation of the present invention more stable and reliable, reducing the vibration wear of the present invention, extending the service life of the present invention, reducing the cost of maintaining the present invention, and saving resources.

[0023] 2. Even when the present invention expands due to heat, since the sealing ring adopts a soft copper ring, the copper ring will only be rubbed off a layer by the surrounding tube, and the copper ring and the surrounding tube will not have long-term rigid friction, which further reduces noise and further improves the stability of impeller rotation, thereby making the operation of the present invention more stable and reliable, further reducing vibration wear of the present invention, further extending the service life of the present invention, further reducing the cost of maintaining the present invention, and saving resources.

[0024] 3. The present invention can improve the accuracy of the sealing ring sliding toward or away from the front disk by providing a long guide hole and a guide member, thereby avoiding aggravated wear of the sealing ring due to the rotation of the sealing ring around the collector, extending the service life of the sealing ring, reducing the number of times the casing is disassembled to maintain and replace the sealing ring, further reducing costs, saving resources, extending the operating cycle of the present invention, and further improving efficiency.

[0025] 4. The present invention provides a socket and auxiliary blades. On the one hand, when the impeller rotates, the auxiliary blades protruding from the sockets can be used to disperse the smoke in the turbulent area, allowing the smoke inside the casing to quickly flow out of the casing, further improving the efficiency of the present invention. On the other hand, at the middle of the blade and the cover plate, which is not easy to weld, the auxiliary blade can be welded to the front disk on the side where the auxiliary blade protrudes from the socket. Therefore, the blade can be welded to the front disk on the side close to the front disk, thereby improving the strength and rigidity of the blade fixed to the front disk, avoiding the blade from twisting and deforming during thermal expansion, and avoiding the displacement of the impeller's center of gravity. This not only further improves the stability of the impeller's rotation, but also further reduces the vibration wear of the present invention, further reduces noise, further extends the service life of the present invention, further reduces the cost of maintaining the present invention, and saves resources.

[0026] 5. On the one hand, the present invention can facilitate the disassembly and assembly of the inspection cover, thereby facilitating the inspection of the impeller in the casing and improving the inspection and maintenance efficiency; on the other hand, the insulation layer in the insulation assembly can completely cover the casing and the inspection cover, which not only reduces the heat loss of the flue gas in the casing, improves the heat utilization efficiency, but also avoids scalding of the staff.

[0027] 6. The present invention provides reinforcing ribs and fixing plates, so that the insulation layer can be in close contact with the casing and the inspection cover, thereby improving the insulation effect of the insulation layer, further reducing heat loss, further improving heat utilization efficiency, further reducing costs and saving resources.

[0028] 7. The present invention can further improve the sealing effect of the present invention and further reduce heat loss by providing the first sealing ring and the second sealing ring, thereby further improving heat utilization efficiency, further reducing costs and saving resources.

[0029] 8. The present invention further facilitates the disassembly and assembly of the cover plate and the housing by providing a first bolt and a first nut, improving disassembly and assembly efficiency and further facilitating the inspection and maintenance of the impeller within the housing. The provision of a second bolt and a second nut facilitates the maintenance and replacement of the second sealing ring located between the pressure ring and the housing, improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of the heat recovery circulation fan in the background technology;

[0031] Figure 2 for Figure 1 A partial enlarged view of point A;

[0032] Figure 3 for Figure 1 A partial enlarged view of point B;

[0033] Figure 4 Schematic diagram of the structure of the flow-through component in the background technology Figure 1 ;

[0034] Figure 5 for Figure 4 A partial enlarged view of point C;

[0035] Figure 6 Schematic diagram of the structure of the flow-through component in the background technology Figure 2 ;

[0036] Figure 7 Schematic diagram of the coordination between the collecting pipe and the impeller;

[0037] Figure 8 for Figure 7 A partial enlarged view of point D;

[0038] Figure 9 is a cross-sectional view of the sealing ring;

[0039] Figure 10 This is the main view of the front disc;

[0040] Figure 11 for Figure 10 Cross-sectional view at EE;

[0041] Figure 12 This is a schematic diagram of the structure of a heat recovery circulation fan for a cracking production line;

[0042] Figure 13 for Figure 12 A partial enlarged view of point F;

[0043] Figure 14 for Figure 12 A local enlarged view of point G;

[0044] Figure 15 for Figure 12 A local enlarged view of point H;

[0045] Figure 16 for Figure 12 A local enlarged view of point I.

[0046] In the picture:

[0047] 1-Casing, 1-1-Inspection window, 1-2-Inspection cover, 1-2-1-Casing air inlet, 1-3-Casing shaft hole, 1-4-Casing connection hole, 2-Impeller, 2-1-Front disk, 2-1-1-Front disk air inlet, 2-1-2-Jack, 2-2-Blade, 2-2-1-Auxiliary blade, 2-3-Rear disk, 2-3-1-Hub, 3-Collector, 3-1-First collector, 3-2-Second collector, 3-2-1-Guide mounting hole, 4-Sealing ring, 4-1-Guide long hole, 5-Guide, 5-1-Guide bolt, 5-2-Guide nut, 6-Elastic part, 7-Surrounding tube, 7-1-Inner hole, 7-2-Surrounding tube bottom, 8-Insulation layer, 8-1-First collector Flow collector mounting hole, 8-2-insulation layer axis hole, 9-guard plate, 9-1-second collector mounting hole, 9-2-guard plate axis hole, 10-reinforcement rib, 11-fixing plate, 12-sealing cover, 13-packing, 14-pressure cover, 15-sleeve, 16-first supporting ring, 17-second supporting ring, 18-first flange, 18-1-first flange connecting hole, 19-second flange, 19-1-second flange connecting hole, 20-first sealing ring, 20-1-first sealing ring connecting hole, 21-second sealing ring, 21-1-second sealing ring connecting hole, 22-pressing ring, 22-1-pressing ring connecting hole, 23-first bolt, 24-first nut, 25-second bolt, 26-second nut, 27-self-tapping screw;

[0048] 100-base, 200-bearing box, 300-coupling, 400-motor, 500-drive shaft. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] Example:

[0051] like Figure 12 As shown, a regenerative circulation fan for a cracking production line includes a base 100, flow passage components, a bearing housing 200, a coupling 300, and a motor 400. The flow passage components include a housing 1 and an impeller 2 disposed within the housing 1. The housing 1, bearing housing 200, coupling 300, and motor 400 are bolted to the upper end surface of the base 100. The motor 400 drives the impeller 2 via a drive shaft 500. The impeller 2 is made of high-temperature and corrosion-resistant 310S stainless steel, and the drive shaft 500 is made of 35CrMo alloy structural steel.

[0052] like Figure 13 As shown, the housing 1 is provided with an inspection window 1-1, and an inspection cover 1-2 is provided in the inspection window 1-1. Figure 7 As shown, the inspection cover 1-2 is provided with a casing air inlet hole 1-2-1.

[0053] like Figure 7 As shown, the impeller 2 includes a front disc 2-1, blades 2-2, and a rear disc 2-3 arranged in sequence. Figure 8 As shown, the front disc 2-1 is provided with a front disc air inlet 2-1-1. Figure 7 As shown, the front disk air inlet 2-1-1 is connected to the casing air inlet 1-2-1 through the collector 3.

[0054] like Figure 7 As shown, the collector 3 is made of 12Cr1MoV alloy structural steel and has a tubular structure. It includes a first collector tube 3-1 and a second collector tube 3-2. The inner diameter of the first collector tube 3-1 gradually decreases, with the inner diameter of the first collector tube 3-1 near the front disk 2-1 being smaller than the inner diameter of the first collector tube 3-1 away from the front disk 2-1. The second collector tube 3-2 is a straight tube structure, located at the end of the first collector tube 3-1 near the front disk 2-1. The inner diameter of the second collector tube 3-2 is equal to the inner diameter of the first collector tube 3-1 near the front disk 2-1. The first and second collector tubes 3-1, 3-2, are integrally formed.

[0055] like Figure 8 As shown, the second manifold 3-2 is covered with a sealing ring 4 at one end close to the front disk 2-1. The sealing ring 4 is made of copper, which has the advantages of high melting point and soft texture. Figure 9 As shown, the sealing ring 4 is provided with eight long guide holes 4-1, and the eight long guide holes 4-1 are evenly distributed along the circumference of the sealing ring 4. Figure 8 As shown, the wall of the second manifold 3-2 is provided with a guide mounting circular hole 3-2-1. The wall of the second manifold 3-2 is provided with a guide member 5, which comprises a guide bolt 5-1 and a guide nut 5-2. First, insert the guide bolt 5-1 into the guide mounting circular hole 3-2-1 and the guide slot 4-1, sequentially from the inside out. Then, screw the guide nut 5-2 onto the guide bolt 5-1, so that the wall of the second manifold 3-2 and the sealing ring 4 are both clamped between the head of the guide bolt 5-1 and the guide nut 5-2. When the sealing ring 4 slides toward or away from the front disk 2-1, the guide bolt 5-1 can slide within the guide slot 4-1.

[0056] like Figure 8As shown, an elastic member 6 is provided between the second manifold 3-2 and the sealing ring 4. The elastic member 6 is a spring. One end of the spring is welded to the tube wall of the second manifold 3-2, and the other end of the spring is welded to the end of the sealing ring 4 away from the front disk 2-1.

[0057] like Figure 8 As shown, the front disc 2-1 is provided with an open-ended surrounding tube 7 at one end near the second manifold 3-2. The bottom 7-2 of the surrounding tube has an inner hole 7-1. The wall of the inner hole 7-1 is welded to the front disc 2-1, and the inner hole 7-1 communicates with the front disc air inlet 2-1-1. The bottom 7-2 of the surrounding tube is engaged with the sealing ring 4.

[0058] A heat recovery circulation fan for a cracking production line of the present embodiment can allow the sealing ring 4 to contact the bottom 7-2 of the cylinder surrounding the cylinder, thereby blocking the gap between the collector 3 and the hole wall of the front disk air inlet hole 2-1-1, so that the flue gas flowing out from the outlet of the impeller 2 and entering the casing 1 will not re-enter the impeller 2 through the gap between the hole wall of the front disk air inlet hole 2-1-1 and the collector 3, avoiding the secondary circulation of the flue gas, thereby improving the efficiency of the heat recovery circulation fan for a cracking production line of the present embodiment.

[0059] Furthermore, since the bottom 7 - 2 of the surrounding cylinder is only in contact with the sealing ring 4 , when the impeller 2 rotates, the fixed collector 3 does not rotate with the impeller 2 , thereby preventing the collector 3 from obstructing the rotation of the impeller 2 .

[0060] Furthermore, since the sealing ring 4 is located in the surrounding tube 7 , the inner cavity of the surrounding tube 7 can also provide a deformation space for the sealing ring 4 and the collector 3 due to thermal expansion.

[0061] In addition, during the operation of a heat recovery circulation fan for a cracking production line, the impeller 2 will not only rotate but also vibrate. When the impeller 2 is vibrated, the first situation occurs: the front disk 2-1 of the impeller 2 will move together with the surrounding tube 7 toward the collector 3, so that the sealing ring 4 is pressed by the bottom 7-2 of the surrounding tube and slides in the direction away from the front disk 2-1. At this time, the elastic member 6 is in a compressed state due to the squeezing of the sealing ring 4, so the elastic member 6 has an elastic force that pushes the sealing ring 4 in the direction close to the front disk 2-1, so that the sealing ring 4 can always be in contact with the bottom 7-2 of the surrounding tube; the second situation occurs: the front disk 2-1 of the impeller 2 will move together with the surrounding tube 7 in the direction away from the collector 3. Since the elastic member 6 has an elastic force that pushes the sealing ring 4 in the direction close to the front disk 2-1, the sealing ring 4 can slide in the direction close to the front disk 2-1, so that the sealing ring 4 can always be in contact with the bottom 7-2 of the surrounding tube.

[0062] Through the above process, it can be known that: during the rotation of the impeller 2, the impeller 2 will vibrate, and then the front disc 2-1 will be close to or away from the collector 3. However, in the heat recovery circulation fan for a cracking production line of this embodiment, no matter whether the front disc 2-1 is close to the collector 3 or the front disc 2-1 is far away from the collector 3, the sealing ring 4 can slide along the collector 3 and always be in contact with the bottom 7-2 of the surrounding cylinder. On the one hand, it ensures the reliability of the sealing ring 4 blocking the gap between the collector 3 and the hole wall of the front disc air inlet 2-1-1, improves the reliability of avoiding the secondary circulation flow of the flue gas, and further improves the efficiency of the heat recovery circulation fan for a cracking production line of this embodiment; on the other hand, since no matter whether the front disc 2-1 is close to the collector Flow collector 3, or front disk 2-1 is away from collector 3, sealing ring 4 can slide along collector 3, so the mutual force between sealing ring 4 and surrounding tube 7 is reduced, thereby reducing friction between sealing ring 4 and surrounding tube 7, reducing noise and vibration caused by friction between sealing ring 4 and surrounding tube 7, improving the rotation stability of impeller 2, and then making the operation of heat recovery circulation fan for cracking production line of this embodiment more stable and reliable, reducing vibration wear of heat recovery circulation fan for cracking production line of this embodiment, extending the service life of heat recovery circulation fan for cracking production line of this embodiment, reducing the cost of maintaining heat recovery circulation fan for cracking production line of this embodiment, and saving resources.

[0063] During the operation of the heat recovery circulation fan in the background technology, the flow-through components expand due to heat, and the casing 1 fixed on the base 100 expands upward. The casing 1 moves upward with the collector 3, and the collector 3 also expands outward. The impeller 2 expands outward with the transmission shaft 500 as the center, and the front disk air inlet hole 2-1-1 also expands outward with the transmission shaft 500 as the center. Therefore, long-term rigid friction will occur between the collector 3 and the front disk 2-1, which reduces the stability of the rotation of the impeller 2 and aggravates the overall vibration and wear of the heat recovery circulation fan in the background technology, which not only increases the noise, but also shortens the service life of the heat recovery circulation fan in the background technology, increases the cost of maintaining the heat recovery circulation fan in the background technology, and wastes resources.

[0064] In the heat recovery circulation fan for a cracking production line of the present embodiment, even if the flow-through components expand due to heat, since the sealing ring 4 is a soft copper ring, the copper ring will only be rubbed off a layer by the surrounding tube 7, and the copper ring and the surrounding tube 7 will not have long-term rigid friction, which further reduces the noise and further improves the stability of the rotation of the impeller 2, thereby further making the operation of the heat recovery circulation fan for a cracking production line of the present embodiment more stable and reliable, further reducing the vibration wear of the heat recovery circulation fan for a cracking production line of the present embodiment, further extending the service life of the heat recovery circulation fan for a cracking production line of the present embodiment, and further reducing the cost of maintaining the heat recovery circulation fan for a cracking production line of the present embodiment and saving resources.

[0065] By providing the guide long hole 4-1 and the guide member 5, the accuracy of the sealing ring 4 sliding toward or away from the front disk 2-1 can be improved, thereby avoiding the aggravation of the loss of the sealing ring 4 due to the rotation of the sealing ring 4 around the second collecting pipe 3-2, extending the service life of the sealing ring 4, reducing the number of times the casing 1 is disassembled to maintain and replace the sealing ring 4, further reducing costs, saving resources, extending the operating cycle of the heat recovery circulation fan for a cracking production line in this embodiment, and further improving efficiency.

[0066] Further, such as Figure 6 As shown, since the front disk 2-1 of the impeller 2 in the background technology is a cylindrical structure with a gradually expanding inner diameter, the front disk 2-1 is concave on the side close to the inspection cover 1-2. As a result, during the rotation of the impeller 2, the flue gas will form a turbulent area (that is, a vortex area) at the arc, so that the flue gas inside the casing 1 cannot flow out of the casing 1 quickly, reducing the efficiency of the heat recovery circulation fan in the background technology.

[0067] When the distance between the front disk 2-1 and the rear disk 2-3 of the impeller 2 is less than 70mm, and the distance between two adjacent blades 2-2 is less than 50mm, the welding gun cannot be inserted into the impeller 2 to weld the middle part of the blade 2-2 close to the front disk 2-1 to the front disk 2-1, but can only be welded to the front disk 2-1 at the end of the blade 2-2 close to the transmission shaft 500 and the end of the blade 2-2 away from the rotating shaft. The reason why the blade 2-2 can be welded to the front disk 2-1 at the end close to the transmission shaft 500 is because the welding gun can be inserted from the front disk air inlet 2-1 of the front disk 2-1. The reason why the blade 2-2 can be welded to the front disk 2-1 at the end away from the transmission shaft 500 is because the welding gun can be inserted from the outlet of the impeller 2. The outlet of the impeller 2 refers to the area surrounded by the two adjacent blades 2-2, the front disk 2-1 and the rear disk 2-3. Since the temperature of flue gas can reach 500-600°C, the blades 2-2 rotate in a high temperature environment, causing the blades 2-2 to expand due to the heat, thereby causing the middle portion of the blades 2-2 to twist and deform. Once the blades 2-2 are twisted and deformed, the center of gravity of the impeller 2 will shift, causing the impeller 2 to rotate unsteadily, further exacerbating the vibration and wear of the heat regeneration fan in the background art. This not only further increases noise, but also further shortens the service life of the heat regeneration fan in the background art, further increasing the cost of maintaining the heat regeneration fan in the background art and wasting resources.

[0068] In this regard, in this embodiment, Figure 10 As shown, the front plate 2-1 is provided with a socket 2-1-2. Figure 7 As shown, the blade 2-2 is provided with an auxiliary blade 2-2-1 that cooperates with the insertion hole 2-1-2 in the middle of the side close to the front disk 2-1, and the auxiliary blade 2-2-1 and the blade 2-2 are integrally formed.

[0069] When the impeller 2 needs to be assembled: first, weld the rear disc 2-3 to the blade 2-2; then, insert the auxiliary blade 2-2-1 on the blade 2-2 into the socket 2-1-2 of the front disc 2-1; then, use a welding gun to weld the end of the blade 2-2 close to the transmission shaft 500 and the end of the blade 2-2 away from the rotating shaft to the front disc 2-1; finally, use a welding gun to weld the auxiliary blade 2-2-1 to the front disc 2-1 on the side where the auxiliary blade 2-2-1 protrudes from the socket 2-1-2.

[0070] By setting the socket 2-1-2 and the auxiliary blade 2-2-1, on the one hand, when the impeller 2 rotates, the auxiliary blade 2-2-1 protruding from the socket 2-1-2 can be used to disperse the flue gas in the turbulent zone, so that the flue gas inside the casing 1 can quickly flow out of the casing 1, further improving the efficiency of the heat recovery circulation fan for the cracking production line of this embodiment. On the other hand, at the position between the middle of the blade 2-2 and the cover plate which is not easy to weld, the auxiliary blade 2-2-1 can be welded and fixed to the front disk 2-1 on the side where the auxiliary blade 2-2-1 protrudes from the insertion hole 2-1-2. Therefore, the blade 2-2 can be welded and fixed to the front disk 2-1 on the side close to the front disk 2-1, thereby improving the strength and rigidity of the blade 2-2 and the front disk 2-1 fixed together, avoiding the distortion of the blade 2-2 during thermal expansion, and avoiding the shift of the center of gravity of the impeller 2. This not only further improves the rotation stability of the impeller 2, but also further reduces the vibration and wear of the heat recovery circulation fan for the cracking production line of this embodiment, further reduces the noise, further extends the service life of the heat recovery circulation fan for the cracking production line of this embodiment, and further reduces the cost of maintaining the heat recovery circulation fan for the cracking production line of this embodiment, saving resources.

[0071] Further, such as Figure 1 As shown, the outer side of the housing 1 of the heat recovery circulation fan in the background art is provided with an insulation assembly and a sealing assembly. The insulation assembly in the background art includes an insulation layer 8 and a protective plate 9. The outer side of the housing 1 and the outer side of the inspection cover 1-2 in the background art are both covered with the insulation layer 8. The side of the insulation layer 8 away from the housing 1 and the side of the insulation layer 8 away from the inspection cover 1-2 are both covered with the protective plate 9.

[0072] like Figure 1 As shown, in order to facilitate the inspection and maintenance of the impeller 2 in the casing 1, when laying the insulation layer 8: first, avoid the bolts used to fix the casing 1 and the inspection cover 1-2 together, and lay the insulation layer 8 on the outside of the casing 1, the outside of the inspection cover 1-2, and the outside of the collector 3 exposed outside the casing 1; then, use the guard plate 9 (thin iron plate) to press the insulation layer 8. When the impeller 2 needs to be inspected: first, remove the bolts used to fix the casing 1 and the inspection cover 1-2 together, remove the inspection cover 1-2, and expose the impeller 2 in the casing 1, so that the maintenance personnel can inspect the impeller 2 in the casing 1; then, after the maintenance personnel have inspected the impeller 2, they use the bolts to fix the inspection cover 1-2 to the casing 1 again.

[0073] like Figure 2 As shown, the sealing assembly in the background art includes a sealing cover 12, a packing 13, and a gland 14, which are sequentially arranged to cooperate with the transmission shaft 500. The sealing cover 12, the packing 13, and the gland 14 are sequentially fixed to the housing 1 by screws.

[0074] In the above background technology, the heat-insulating layer 8 does not completely cover the casing 1, which not only causes the heat of the smoke in the casing 1 to be lost, reducing the heat utilization efficiency, but also easily burns the staff.

[0075] In this regard, in this embodiment, Figure 15 As shown, the insulation assembly also includes reinforcing ribs 10 and fixing plates 11. Figure 16 As shown, the insulation layer 8 is provided with a first collector mounting hole 8-1 communicating with the air inlet hole 1-2-1 of the casing, as shown in FIG. Figure 14 As shown, the insulation layer 8 is provided with an insulation layer shaft hole 8-2, and the insulation layer shaft hole 8-2 is connected to the housing shaft hole 1-3 provided on the housing 1. Figure 16 As shown, the guard plate 9 is provided with a second collector mounting hole 9-1 communicating with the first collector mounting hole 8-1. Figure 14 As shown, the guard plate 9 is provided with a guard plate shaft hole 9-2 which is connected to the insulation layer shaft hole 8-2. Figure 7 As shown, the second collector mounting hole 9-1, the first collector mounting hole 8-1, and the housing air inlet hole 1-2-1 are all matched with the collector 3. Figure 15 As shown, the reinforcing rib 10 and the fixing plate 11 are both arranged in the insulation layer 8, one end of the reinforcing rib 10 is welded and fixed to the casing 1, and the reinforcing rib 10 is welded and fixed to the fixing plate 11 at the end away from the casing 1, and the guard plate 9 is connected to the insulation layer 8 and the fixing plate 11 in sequence through fasteners. Specifically: the fasteners are self-tapping screws 27, and the self-tapping screws 27 are tapped into the guard plate 9, the insulation layer 8, and the fixing plate 11 from the outside to the inside, so that the fixing plate 11, the insulation layer 8, and the guard plate 9 are fixed together through the self-tapping screws 27.

[0076] In this embodiment, if Figure 14 As shown, the sealing assembly also includes a sleeve 15 that mates with the drive shaft 500. Sleeve 15 is positioned between the housing 1 and the sealing cover 12. Sleeve 15 is inserted, from the outside in, into the guard plate shaft hole 9-2 and the insulation layer shaft hole 8-2. Sleeve 15 is welded to the housing 1 and communicates with the housing shaft hole 1-3. The end of sleeve 15 away from the housing 1 is welded to the sealing cover 12. The sealing cover 12 is welded to the wall of the guard plate shaft hole 9-2. The sealing cover 12 is secured to the gland 14 via bolts. Packing 13 utilizes high-temperature-resistant graphite nickel wire packing.

[0077] like Figure 13As shown, a first supporting ring 16 and a second supporting ring 17 are provided between the inspection window 1-1 and the inspection cover 1-2, from the inside to the outside. One end of the first supporting ring 16 is welded to the inspection cover 1-2, and a first flange 18 is welded to the end of the first supporting ring 16 away from the inspection cover 1-2. One end of the second supporting ring 17 is welded to the casing 1, and a second flange 19 is welded to the end of the second supporting ring 17 away from the casing 1. The second flange 19 is provided on the side of the first flange 18 close to the first supporting ring 16. The thermal insulation layer 8 covering the outside of the casing 1 is provided between the second flange 19 and the casing 1. The wall of the second collector mounting hole 9-1 is welded to the second flange 19, and the first flange 18 and the second flange 19 are fixed by first bolts 23. A first sealing ring 20 is provided between the first flange 18 and the second flange 19. The housing 1 is provided with a second sealing ring 21 on a side away from the heat-insulating layer 8, and the second sealing ring 21 is provided with a pressing ring 22 on a side away from the housing 1. Both the first sealing ring 20 and the second sealing ring 21 are graphite-coated gaskets.

[0078] like Figure 13 As shown, the second flange 19 is welded with a first nut 24 on the side away from the first sealing ring 20. The second flange 19 is provided with a second flange connecting hole 19-1. The first sealing ring 20 is provided with a first sealing ring connecting hole 20-1. The first flange 18 is provided with a first flange connecting hole 18-1. The first flange 18 is provided with a first bolt 23. The first bolt 23 sequentially cooperates with the first flange connecting hole 18-1, the first sealing ring connecting hole 20-1, the second flange connecting hole 19-1, and the first nut 24. The casing 1 is welded with a second bolt 25 on the side close to the insulation layer 8. The casing 1 is provided with a casing connecting hole 1-4. The second sealing ring 21 is provided with a second sealing ring connecting hole 21-1. The pressure ring 22 is provided with a pressure ring connecting hole 22-1. The pressure ring 22 is provided with a second nut 26 on the side away from the second sealing ring 21. The second bolt 25 sequentially cooperates with the casing connecting hole 1-4, the second sealing ring connecting hole 21-1, the pressure ring connecting hole 22-1, and the second nut 26.

[0079] When the impeller 2 needs to be inspected: first, unscrew the first bolt 23 so that the first flange 18 and the second flange 19 are no longer fixed together; then, remove the inspection cover 1-2, and the maintenance personnel inspect the impeller 2 located in the casing 1 through the inspection window 1-1.

[0080] This arrangement, on the one hand, can facilitate the disassembly and assembly of the inspection cover 1-2, thereby facilitating the inspection of the impeller 2 in the casing 1 and improving the inspection and maintenance efficiency; on the other hand, it can enable the insulation layer 8 in the insulation assembly to completely cover the casing 1 and the inspection cover 1-2, which not only avoids the heat loss of the flue gas in the casing 1, improves the heat utilization efficiency, but also avoids burns to the staff.

[0081] like Figure 15As shown, by providing reinforcing ribs 10 and fixing plates 11, the thermal insulation layer 8 can be made to fit closely to the casing 1 and the inspection cover 1-2, thereby improving the thermal insulation effect of the thermal insulation layer 8, further reducing heat loss, further improving heat utilization efficiency, further reducing costs, and saving resources.

[0082] By providing the first sealing ring 20 and the second sealing ring 21 , the sealing effect of the housing 1 of this embodiment can be further improved, heat loss can be further reduced, and thus the heat utilization efficiency can be further improved, and the cost can be further reduced and resources can be saved.

[0083] The provision of the first bolt 23 and the first nut 24 further facilitates the assembly and disassembly of the cover plate 1-2 from the casing 1, improving assembly and disassembly efficiency and further facilitating the inspection and maintenance of the impeller 2 within the casing 1. The provision of the second bolt 25 and the second nut 26 facilitates the maintenance and replacement of the second sealing ring 21 between the pressure ring 22 and the inner wall of the casing 1, improving maintenance efficiency.

[0084] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A heat recovery circulation fan for a cracking production line, comprising a flow passage component, the flow passage component comprising a casing and an impeller disposed within the casing, the impeller comprising a front disc, blades, and a rear disc connected in sequence, the front disc air inlet provided on the front disc being connected to the casing air inlet provided on the casing through a tubular structured collector, characterized in that: The collector is provided with a sealing ring at one end close to the front disc, and the sealing ring is slidably connected to the collector via an elastic member. The front disc is provided with a surrounding tube with one end open on one side close to the collector, the bottom of the surrounding tube is connected to the front disc, the bottom of the surrounding tube is provided with an inner hole connected to the air inlet hole of the front disc, the bottom of the surrounding tube is in contact with the end of the sealing ring, and the peripheral wall of the surrounding tube is provided on the peripheral side of the sealing ring; The casing is provided with an inspection window, an inspection cover is provided in the inspection window, the inspection cover is connected to the casing, the inspection cover is provided with the casing air inlet, a first supporting ring is provided on the outer periphery of the inspection cover, a second supporting ring is provided on the inner periphery of the inspection window, the second supporting ring is sleeved on the outer side of the first supporting ring, one axial end of the first supporting ring is connected to the inspection cover, the first supporting ring is provided with a first flange at the other axial end away from the inspection cover, one axial end of the second supporting ring is connected to the casing, the second supporting ring is provided with a second flange at the other axial end away from the casing, the second flange is provided on the side of the first flange close to the first supporting ring, and the first flange is connected to the second flange; An insulation assembly and a sealing assembly are provided on the outside of the casing. The insulation assembly includes an insulation layer and a guard plate. The outside of the casing and the outside of the inspection cover are sequentially provided with an insulation layer and a guard plate. The insulation layer provided on the outside of the casing is provided between the second flange and the casing. The insulation layer is provided with a first collector mounting hole connected to the air inlet of the casing. The insulation layer is provided with an insulation layer axis hole. The insulation layer axis hole is connected to the casing axis hole provided on the casing. The guard plate is provided with a second collector mounting hole connected to the first collector mounting hole. The guard plate is provided with a guard plate axis hole connected to the insulation layer axis hole. The second collector mounting hole, the first collector mounting hole, and the casing air inlet are all matched with the collector. The sealing assembly includes a sleeve, a sealing cover, a packing and a pressure cover. The sleeve, the sealing cover, the packing and the pressure cover are all matched with the transmission shaft used to drive the impeller to rotate. The sleeve, the sealing cover, the packing and the pressure cover are connected in sequence along the axial direction of the transmission shaft. The sleeve is matched with the guard plate shaft hole, the insulation layer shaft hole and the casing shaft hole in sequence along the axial direction of the transmission shaft. The sleeve is connected to the casing, and the sealing cover is connected to the guard plate.

2. A heat recovery circulation fan for a cracking production line according to claim 1, characterized in that: The sealing ring is a copper ring.

3. A heat recovery circulation fan for a cracking production line according to claim 1, characterized in that: The sealing ring is provided with a guide long hole, and the collector is provided with a guide piece that cooperates with the guide long hole. The guide piece includes a guide bolt and a guide nut. The collector includes a first collecting pipe and a second collecting pipe. The tube wall of the second collecting pipe is provided with a guide piece mounting circular hole. The guide bolt is inserted into the guide piece mounting circular hole and the guide long hole from the inside to the outside in sequence. The guide bolt is threadedly connected to the guide nut. The tube wall of the second collecting pipe and the sealing ring are clamped between the head of the guide bolt and the guide nut.

4. A heat recovery circulation fan for a cracking production line according to claim 1, characterized in that: The front disc is provided with an insertion hole, and the blade is provided with an auxiliary blade matched with the insertion hole in the middle of the side close to the front disc. The auxiliary blade is welded and fixed to the front disc on the side where the auxiliary blade protrudes from the insertion hole.

5. The heat recovery circulation fan for a cracking production line according to claim 1, characterized in that: The insulation component also includes a reinforcing rib and a fixing plate, both of which are arranged in the insulation layer. One end of the reinforcing rib is connected to the casing, and the end of the reinforcing rib away from the casing is connected to the fixing plate. The guard plate is connected to the insulation layer and the fixing plate in sequence through fasteners.

6. A heat recovery circulation fan for a cracking production line according to claim 1, characterized in that: A first sealing ring is provided between the first flange and the second flange, a second sealing ring is provided on a side of the casing away from the thermal insulation layer, and a pressure ring is provided on a side of the second sealing ring away from the casing.

7. A heat recovery circulation fan for a cracking production line according to claim 6, characterized in that: The second flange is provided with a first nut on a side away from the first sealing ring, the second flange is provided with a second flange connecting hole, the first sealing ring is provided with a first sealing ring connecting hole, the first flange is provided with a first flange connecting hole, and the first flange is provided with a first bolt, and the first bolt is sequentially engaged with the first flange connecting hole, the first sealing ring connecting hole, the second flange connecting hole, and the first nut; The casing is provided with a second bolt on the side close to the insulation layer, the casing is provided with a casing connecting hole, the second sealing ring is provided with a second sealing ring connecting hole, the pressure ring is provided with a pressure ring connecting hole, and the pressure ring is provided with a second nut on the side away from the second sealing ring. The second bolt cooperates with the casing connecting hole, the second sealing ring connecting hole, the pressure ring connecting hole, and the second nut in sequence.

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