High temperature circulating fan for a double chamber furnace

Abstract

The application discloses a high-temperature circulating fan for a double-chamber furnace, which comprises a support, a machine shell arranged on the support, an impeller arranged in the machine shell, a main shaft connected with the impeller, a hub of the impeller, a plurality of blades connected along the side surface of the hub, and a circular arc arranged at the blade outlet of each blade away from the hub end. The machine shell is a multi-layer structure, and a cooling water channel is arranged in the main shaft along the axial direction. The application has the advantages that the structure design of the impeller can improve the pressure, reduce the influence of corrosion and ash accumulation, improve the blade shape, and enhance the air supply capacity of the fan; the multi-layer structure of the machine shell effectively reduces the material cost and maintenance cost of the machine shell, facilitates maintenance, solves the problem of difficult maintenance for customers, and greatly reduces the use cost of customers; the cooling water channel arranged in the main shaft actively cools the bearing by water, avoids over-temperature damage of the bearing on the main shaft, and improves the service life of the fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of double-chamber furnace blower, in particular to a high-temperature circulating blower for double-chamber furnace. BACKGROUND

[0002] The main advantages of the double-chamber furnace are low waste gas emission, energy saving, high waste aluminum melting rate, and high production efficiency, especially suitable for smelting recycled aluminum. The double-chamber furnace adopts advanced waste gas combustion technology, which performs secondary combustion on the cracking waste gas generated during the combustion of waste materials, fully utilizes the heat, increases the temperature of the main chamber, and reduces the fuel consumption, which has very good prospects in protecting the environment and energy saving and emission reduction. The double-chamber furnace blower plays an important role in this process. The first is to use hot flue gas to preheat the waste materials on the furnace bridge, and the second is to send part of the waste material chamber flue gas into the heating chamber through the flue.

[0003] The existing double-chamber furnace blower is used in the process, because the furnace temperature is too high, and the waste material chamber flue gas contains a certain amount of cracking gas. These flue gas has high temperature and corrosion, which can easily corrode the impeller of the blower, the bearing on the main shaft is easy to be damaged in the high temperature environment, the machine shell is easy to be deformed and corroded, and the vibration is too large, which shortens the service life of the blower and cannot be used for a long time. Therefore, the blower needs to be improved. For example, the patent with the patent number CN208252388U and the patent name of a high-temperature axial flow homogenizing furnace blower discloses that the cotton heat insulation area is arranged in the machine shell, and the water cooling circulation connector and the water cooling circulation pipe are arranged in the machine shell. The function of the cotton heat insulation area is to keep warm, so that the fuel gas consumption is less when the furnace is heated and kept warm, and the energy saving effect is achieved. Through the water cooling circulation connector and the water cooling circulation pipe, the internal temperature rise caused by friction of the equipment can be reduced, the equipment damage caused by high temperature can be prevented, and the service life of the equipment can be improved. However, the water cooling circulation pipe is only arranged in the machine shell, and cannot effectively cool other structures in the machine shell. Although the high-temperature axial flow homogenizing furnace blower achieves the purpose of improving the service life of the blower, it does not solve the problems of deformation and corrosion of the machine shell of the blower, and does not solve the problem of high cost of maintenance of the machine shell, nor does it solve the problem of easy damage of the bearing on the main shaft in the high temperature environment. Therefore, the blower needs to be further improved. SUMMARY

[0004] The purpose of the present application is to provide a high-temperature circulating blower for double-chamber furnace to solve the problems in the background art.

[0005] In order to achieve the above object, the application provides the following technical scheme: a high-temperature circulating fan for a double-chamber furnace, comprising a support, a machine shell is arranged on the support, an impeller is arranged in the machine shell, the impeller is connected with a main shaft, the impeller comprises a hub, a plurality of blades are connected along the side surface of the hub, the blades are forward straight blades, a circular arc is arranged at the blade outlet of the end of each blade away from the hub, the machine shell is a multi-layer structure, and a cooling water channel is arranged in the main shaft along the axial direction of the main shaft.

[0006] Further preferably, the end angle of the circular arc of the blade outlet of the blade is 125 degrees, which can effectively improve the pressure of the blade and improve the efficiency of the fan.

[0007] Further preferably, a rear disc is arranged at the end of the hub close to the main shaft, and a first reinforcing plate is connected between each blade and the rear disc, thereby improving the mounting strength of the blade.

[0008] Further preferably, a second reinforcing plate is connected between each blade and the hub, thereby increasing the welding strength between the root of the blade and the hub, reducing stress concentration, and preventing the root of the blade from being torn.

[0009] Further preferably, the multi-layer structure of the machine shell comprises, from the inside to the outside, a castable layer, a ceramic fiber blanket layer, a ceramic fiber paper layer and an iron plate layer, wherein the castable layer has the properties of high temperature resistance, corrosion resistance and wear resistance, the ceramic fiber blanket layer and the ceramic fiber paper layer have good heat insulation effect, the iron plate layer has good protection effect, thereby improving the strength of the machine shell, and the multi-layer structure of the machine shell can be reused, saving material cost, and when the inner layer is damaged, the inner castable layer can be knocked off and recast, which is low in cost. The multi-layer structure of the machine shell effectively reduces the manufacturing cost of the machine shell and improves the service life.

[0010] Further preferably, the ceramic fiber blanket layer is three layers, the temperature of the castable layer is insulated by the three ceramic fiber blanket layers, and the heat insulation effect is further improved; the iron plate layer is made of carbon steel iron plate material, has high structural strength, effectively improves the structural strength of the machine shell, and improves the service life of the high-temperature circulating fan.

[0011] Further preferably, the main shaft is provided with a plug body at the end away from the impeller, the plug body is inserted into the cooling water channel, and the cooling water channel is blocked by the plug body to prevent the cooling water from flowing out; the insertion end of the plug body is in clearance fit with the cooling water channel, a through hole is formed in the plug body along the axial direction of the plug body, and the through hole is convenient for the cooling water to flow in; the through hole is a stepped hole including a large-diameter section and a small-diameter section, the small-diameter section is close to the impeller end of the through hole, the small-diameter section is connected with a first water pipe inserted into the cooling water channel, the first water pipe is in clearance fit with the cooling water channel, the large-diameter section is connected with a third water pipe extending out of the plug body, the third water pipe is inserted with a second water pipe, the second water pipe is in clearance fit with the third water pipe and the large-diameter section, the second water pipe is connected with the small-diameter section, a plurality of connecting holes are formed in the plug body and in communication with the large-diameter section, and the plurality of connecting holes are in communication with the cooling water channel. The second water pipe can be used to flow in the cooling water, the cooling water flows into the first water pipe through the small-diameter section of the through hole, then flows into the gap between the cooling water channel and the first water pipe, and then flows into the gap between the plug body and the cooling water channel, the cooling water takes away the heat on the main shaft, then flows into the gap between the through hole of the large-diameter section and the second water pipe through the connecting holes, and finally flows out through the third water pipe, so as to take away the heat of the main shaft, cool and heat the main shaft, cool and heat the bearing on the main shaft, prolong the service life of the bearing, and further improve the service life of the high-temperature circulating fan.

[0012] Further preferably, the first water pipe is inserted into the small-diameter section and is in interference fit with the small-diameter section, so as to ensure the connection effect of the first water pipe and prevent the heated cooling water from flowing into the connection between the first water pipe and the small-diameter section to affect the cooling effect; the second water pipe is inserted into the small-diameter section and is in interference fit with the small-diameter section, so as to ensure the connection effect of the second water pipe and prevent the heated cooling water from flowing into the small-diameter section through the connection between the second water pipe and the small-diameter section to affect the cooling effect; and the third water pipe is inserted into the large-diameter section and is in interference fit with the large-diameter section, so as to ensure the connection effect of the third water pipe and prevent the cooling water from flowing out through the connection between the third water pipe and the large-diameter section.

[0013] Further preferably, the second water pipe is connected with a water inlet joint, the third water pipe is connected with a water outlet joint, and the water outlet joint is connected with a drain pipe, so as to collect the outflowing cooling water, facilitate the reuse of the cooling water, effectively save resources, and reduce costs.

[0014] Further preferably, the impeller is made of nickel-based alloy material, so as to improve the overall high-temperature resistance, corrosion resistance and wear resistance of the impeller, and improve the structural strength and service life of the impeller.

[0015] Beneficial effects: the high-temperature circulating fan for double-chamber furnace of the application, through the structural design of the impeller, sets an arc at the blade outlet of the blade, and increases the reinforcing plate, removes the front disc, can improve the pressure, reduce the influence of corrosion and ash wear, improve the blade shape, and enhance the air supply capacity of the fan; through the adoption of the multi-layer structure of the casing, the casing has the properties of high-temperature resistance, corrosion resistance and wear resistance, effectively reduces the material cost and maintenance cost of the casing, and is convenient to maintain, solves the problem of difficult maintenance of the customer, greatly reduces the use cost of the customer; through the setting of the cooling water channel on the main shaft, the main shaft water cooling is adopted to actively cool the bearing, avoids the over-temperature damage of the bearing on the main shaft, and improves the service life of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the main structure schematic view of the high-temperature circulating fan for double-chamber furnace disclosed by the embodiment of the application.

[0017] Figure 2 It is the main structure schematic view of the impeller disclosed by the embodiment of the application.

[0018] Figure 3 It is the left structure schematic view of the impeller disclosed by the embodiment of the application.

[0019] Figure 4 It is the sectional structure schematic view of the casing disclosed by the embodiment of the application.

[0020] Figure 5 It is the sectional structure schematic view of the main shaft disclosed by the embodiment of the application.

[0021] Figure 6 It is Figure 5 It is the enlarged structure schematic view of A in the middle.

[0022] Figure 7 It is the efficiency data table of the traditional straight-blade fan disclosed by the embodiment of the application.

[0023] Figure 8 It is the efficiency data table of the high-temperature circulating fan for double-chamber furnace disclosed by the embodiment of the application.

[0024] Reference signs: 1 - support, 2 - casing, 21 - cast material layer, 22 - ceramic fiber blanket layer, 23 - ceramic fiber paper layer, 24 - iron plate layer, 3 - impeller, 31 - hub, 32 - blade, 33 - rear disc, 34 - first reinforcing plate, 35 - second reinforcing plate, 4 - main shaft, 41 - cooling water channel, 42 - plug body, 43 - through hole, 431 - large diameter section, 432 - small diameter section, 44 - first water pipe, 45 - second water pipe, 46 - third water pipe, 47 - connecting hole, 48 - water inlet joint, 49 - water outlet joint. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0026] like Figures 1-6 As shown, a high-temperature circulating fan for a dual-chamber furnace is used to preheat the waste material on the furnace bridge with hot flue gas, and a portion of the flue gas from the waste material chamber is sent into the heating chamber through a flue. The high-temperature circulating fan includes a support frame 1, on which a casing 2 is mounted. An impeller 3 is housed within the casing 2, and the impeller 3 is connected to a main shaft 4. The support frame 1 supports the casing 2 and the main shaft 4, and the main shaft 4 drives the impeller 3 to rotate, thus providing airflow. The impeller 3 includes a hub 31, with multiple blades 32 connected along the side of the hub 31. The blades 32 are forward-curving straight blades, and each blade 32 has an arc at its outlet furthest from the hub 31. This arc at the blade outlet increases the fan pressure. The casing 2 has a multi-layer structure made of multiple layers of heat-resistant and heat-insulating materials. From the inside out, the layers are: a castable refractory layer 21, a ceramic fiber blanket layer 22, a ceramic fiber paper layer 23, and an iron plate layer 24. The castable refractory layer 21 is heat-resistant and corrosion-resistant. The corrosion-resistant and wear-resistant material layer prevents it from being burned by the high temperature of the dual-chamber furnace; the ceramic fiber blanket layer 22 and the ceramic fiber paper layer 23 serve as heat insulation layers to prevent heat loss. The ceramic fiber blanket layer 22 is a triple-layer structure, further enhancing its heat insulation capabilities and preventing burns to personnel or damage to other materials due to heat dissipation; the iron plate layer 24 is made of carbon steel plate material, possessing high hardness, high wear resistance, and high strength, improving the structural strength of the casing 2 and extending the service life of the high-temperature circulating fan. A cooling water channel 41 is provided inside the main shaft 4 along its central axis. By circulating cooling water through the cooling water channel 41, active cooling of the main shaft 4 is achieved, preventing overheating damage to the bearings on the main shaft 4 and further extending the service life of the high-temperature circulating fan.

[0027] In this application, the high-temperature circulating fan has 8 blades 32, and the arc angle at the outlet of each blade 32 is 125 degrees, which can increase the fan pressure by about 10% and the fan efficiency by about 6%, thereby improving and enhancing the performance of the high-temperature circulating fan. Figures 7-8 It can be seen that traditional straight-blade fans do not have a curved outlet on their straight blades; the outlet angle is a conventional 90 degrees. The performance of the high-temperature circulating fan of this application is significantly higher than that of traditional straight-blade fans. A rear plate 33 is provided near the main shaft 4 end of the hub 31. Each blade 32 is connected to the rear plate 33 by a first reinforcing plate 34. The structural arrangement of the rear plate 33 and the first reinforcing plate 34 improves the installation strength of the blades 32 and increases the support force on the blades 32. Furthermore, the impeller 2 of this application does not have a front plate, facilitating dust fall-off and reducing dust accumulation.

[0028] In the application, the second reinforcing plate 35 is connected between each blade 32 and the hub 31, which can increase the welding strength between the root of the blade 32 and the hub 31, reduce stress concentration, prevent the root of the blade 32 from tearing, and further increase the supporting force of the blade 32.

[0029] In the application, the shaft 4 is provided with a plug body 42 at the end away from the impeller 3, which realizes the end sealing of the cooling water channel 41 and prevents the cooling water from flowing out. The plug body 42 is inserted into the cooling water channel 41, and the insertion end of the plug body 42 is in clearance fit with the cooling water channel 41. A through hole 43 is arranged in the plug body 42 along the axial direction thereof, which is used for the inlet of the cooling water and realizes the cooling and temperature reduction functions. The through hole 43 is a stepped hole including a large-diameter section 431 and a small-diameter section 432. The small-diameter section 432 is close to the impeller 3, and the first water pipe 44 is connected to the small-diameter section 432 and inserted into the cooling water channel 41. The first water pipe 44 is in clearance fit with the cooling water channel 41. The large-diameter section 431 is connected with the third water pipe 46 extending out of the plug body 42. The second water pipe 45 is inserted into the third water pipe 46, and the second water pipe 45 is in clearance fit with the third water pipe 46 and the large-diameter section 431. The second water pipe 45 is connected with the small-diameter section 431. A plurality of connecting holes 47 are arranged on the plug body 42 and communicate with the large-diameter section 432. The plurality of connecting holes 47 communicate with the cooling water channel 41. The second water pipe 45 is used for the inlet of the cooling water, and the third water pipe 45 is used for the outlet of the cooling water. The cooling water channel 41 realizes the conduction of the cooling water and realizes the heat absorption and temperature reduction of the shaft 4. When the cooling water flows in through the second water pipe 45, the cooling water first enters the small-diameter section 432 of the through hole 43 of the plug body 42, then enters the first water pipe 44, and then flows into the entire cooling water channel 41 to absorb the heat on the shaft 4. The cooling water is heated in the cooling water channel 41, enters the clearance between the plug body 42 and the cooling water channel 41, and then flows into the large-diameter section 431 of the through hole 43 through the connecting holes 47. At this time, the heated cooling water enters the third water pipe 46 through the clearance between the second water pipe 45 and the large-diameter section 431, and is discharged from the third water pipe 46 to realize the heat removal, i.e., the cooling and temperature reduction of the shaft 4. In the application, the cooling water flows in through the second water pipe 45 and flows out through the third water pipe 46. The cooling water is in a flowing state all the time, continuously enters the cooling water with low temperature, and flows out the heated cooling water, which can actively take away the heat on the shaft 4 and maintain the continuous cooling effect, isolate the heat transferred to the bearing on the shaft 4, and keep the bearing temperature in a low-temperature state all the time.

[0030] In the application, the bearing temperature on the main shaft 4 can be kept below 40 degrees under the cooling and temperature reduction of the cooling water in the cooling water channel 41, and the temperature of the outflowing cooling water is more than 30 degrees. Compared with the water-cooled bearing seat cooling method, the bearing temperature on the main shaft 4 in the working process of the high-temperature circulating fan is lowered by about 40 degrees, which greatly improves the service life of the bearing.

[0031] In the application, the first water pipe 44 is inserted into the small-diameter section 432 and is interference-fitted with the small-diameter section 432, so as to ensure the connection effect of the first water pipe 44 and prevent the heated cooling water in the cooling water channel 41 from flowing into the first water pipe 44 through the connection between the first water pipe 44 and the small-diameter section 432, thereby affecting the cooling effect; the second water pipe 45 is inserted into the small-diameter section 432 and is interference-fitted with the small-diameter section 432, so as to ensure the connection effect of the second water pipe 45 and prevent the heated cooling water in the cooling water channel 41 from flowing into the first water pipe 44 through the connection between the connection hole 47, the second pipe 45 and the small-diameter section 432, thereby affecting the cooling effect; the third water pipe 46 is inserted into the large-diameter section 431 and is interference-fitted with the large-diameter section 431, so as to ensure the connection effect of the third water pipe 46 and the large-diameter section 431 and prevent the heated cooling water from flowing out through the connection between the third water pipe 46 and the large-diameter section 431, thereby causing waste of cooling water and affecting the normal operation of the double-chamber furnace.

[0032] In the application, the second water pipe 45 is connected with the water inlet joint 48, so as to facilitate the connection of the cooling water source; the third water pipe 46 is connected with the water outlet joint 49, so as to facilitate the connection of the drain pipe and realize the collection of the discharged heated cooling water, thereby reducing the waste of cooling water and realizing the reuse of the cooling water.

[0033] In the application, the impeller 3 is made of nickel-based alloy material, so as to ensure the high-temperature resistance, corrosion resistance and wear resistance of the entire impeller 3 and reduce the service life problem of the impeller 3 caused by corrosion.

[0034] Compared with the use of the traditional fan in the double-chamber furnace, the service life of the fan is greatly improved, the structural design of the impeller 3 reduces the influence of corrosion, dust accumulation and wear, improves the blade shape, increases the pressure, and enhances the air supply capacity of the fan; the machine shell 2 is cast, which is resistant to high temperature, corrosion and wear, thereby reducing the material cost and maintenance cost; the main shaft 4 adopts the water-cooled main driven bearing cooling method, which avoids the over-temperature damage of the bearing on the main shaft 42 and improves the service life of the fan.

[0035] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A high-temperature circulating fan for a double-chamber furnace, comprising a support (1), a machine shell (2) is arranged on the support (1), a impeller (3) is arranged in the machine shell (2), and a main shaft (4) is connected to the impeller (3), characterized in that: The impeller (3) comprises a hub (31), a plurality of blades (32) are connected along the side of the hub (31), the blades (32) are forward straight blades, the blade outlet of the distal end of each blade (32) from the hub (31) is provided with a circular arc, the casing (2) is a multi-layer structure, the main shaft (4) is provided with a cooling water channel (41) along the axial direction thereof, the multi-layer structure of the casing (2) comprises, from inside to outside, a cast material layer (21), a ceramic fiber blanket layer (22), a ceramic fiber paper layer (23) and an iron plate layer (24), the ceramic fiber blanket layer (22) is three layers, the distal end of the main shaft (4) from the impeller (3) is provided with a plug body (42), the plug body (42) is inserted into the cooling water channel (41), the insertion end of the plug body (42) is in clearance fit with the cooling water channel (41), the plug body (42) is provided with a through hole (43) along the axial direction thereof, the through hole (43) is a stepped hole comprising a large-diameter section (431) and a small-diameter section (432), the small-diameter section (432) is the end of the through hole (43) close to the impeller (3), the small-diameter section (432) is connected with a first water pipe (44) inserted into the cooling water channel (41), the first water pipe (44) is in clearance fit with the cooling water channel (41), the large-diameter section (431) is connected with a third water pipe (46) extending out of the plug body (42), the third water pipe (46) is inserted with a second water pipe (45), the second water pipe (45) is in clearance fit with the third water pipe (46), the second water pipe (45) is in clearance fit with the large-diameter section (431), the second water pipe (45) is connected with the small-diameter section (432), the plug body (42) is provided with a plurality of connecting holes (47) in communication with the large-diameter section (431), the plurality of connecting holes (47) are in communication with the cooling water channel (41), the first water pipe (44) is inserted into the small-diameter section (432) and is in interference fit with the small-diameter section (432), the second water pipe (45) is inserted into the small-diameter section (432) and is in interference fit with the small-diameter section (432), the third water pipe (46) is inserted into the large-diameter section (431) and is in interference fit with the large-diameter section (431), the second water pipe (45) is connected with a water inlet connector (48), and the third water pipe (46) is connected with a water outlet connector (49).

2. A high temperature circulating fan for a double chamber furnace according to claim 1, characterized in that: The angle of the circular arc end of the blade outlet of the blade (32) is 125 degrees.

3. A high temperature circulating fan for a double chamber furnace as claimed in claim 1, wherein: The hub (31) is provided with a rear disc (33) close to the main shaft (4), and each blade (32) and the rear disc (33) are connected with a first reinforcing plate (34).

4. A high temperature circulating fan for a dual chamber furnace as defined in claim 1, wherein: Each blade (32) and the hub (31) are connected with a second reinforcing plate (35).

5. A high temperature circulating fan for a dual chamber furnace as defined in claim 1, wherein: The iron plate layer (24) is made of carbon steel iron plate material.

6. A high temperature circulating fan for a dual chamber furnace as defined in claim 1, wherein: The impeller (3) is made of nickel-based alloy material.

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