Plug-in high-temperature fan for heating furnace

Abstract

According to the plug-in high-temperature fan for the heating furnace, the outer heat insulation sleeves are arranged on the outer sides of the hollow shaft and the inner fixed barrel at the same time, and the heat preservation cotton is arranged in the outer heat insulation sleeves, so that heat transferred from the side wall of the heating furnace to the inner fixed barrel and the hollow shaft can be reduced, and the heat insulation performance is improved. The carbon sealing ring and the graphite packing are arranged at the butt joint position of the hollow shaft and the bottom side fixing plate of the inner fixing barrel, nitrogen is filled into the carbon sealing ring through the nitrogen pipe, the sealing performance is greatly improved, and gas in the furnace is prevented from leaking to the hollow shaft. A heat dissipation disc is arranged between the lower bearing assembly and the carbon sealing ring and matched with a center hole of the hollow shaft, so that cooling gas can flow from the top end of the hollow shaft to the bottom end of the hollow shaft located below the lower bearing assembly, the bearing assemblies are fully cooled, air blowing cooling is conducted on the lower bearing assembly through a compressed air pipe, and the service life of the lower bearing assembly is prolonged. The whole structure is compact, the occupied space is small, a water cooling or oil cooling mode is not needed, and construction is convenient.

Description

Technical Field

[0001] The utility model relates to the field of high-temperature fans, in particular to an inserted high-temperature fan for a heating furnace. Background Art

[0002] Plug-in high-temperature fans are widely used in various heat treatment furnaces, so that the airflow in the furnace circulates convection to ensure a constant temperature in the furnace. Conventional plug-in high-temperature fans generally have an integrated insulation block and a transmission group. In order to avoid damage to bearings, motors, etc. due to excessive temperatures, water cooling or oil cooling is used to cool the fan main shaft. The water cooling or oil cooling method has a more complex structure, occupies a larger space, and requires more seals. However, for some special furnace types and on-site equipment, the installation space of the plug-in high-temperature fan is small, which makes it inconvenient to use water cooling or oil cooling. In addition, for situations where sealing and thermal insulation performance are required to be high, the cooling method and sealing and thermal insulation performance of the existing plug-in high-temperature fans are difficult to meet the requirements in these situations. Utility Model Content

[0003] The utility model aims to provide an inserted high-temperature fan for a heating furnace, so as to improve the cooling and sealing performance of the fan.

[0004] The utility model adopts the following technical solution to solve the above technical problems: an insertable high-temperature fan for a heating furnace, comprising a hollow shaft vertically inserted into the side wall of the heating furnace, an impeller being installed at one end of the hollow shaft located inside the heating furnace, the hollow shaft being located inside an inner fixed cylinder and an outer heat-insulating sleeve, the hollow shaft passing through a bottom fixing plate of the inner fixed cylinder, the lower half of the outer heat-insulating sleeve being sleeved on the hollow shaft between the side wall of the heating furnace and the bottom fixing plate of the inner fixed cylinder, the upper half of the outer heat-insulating sleeve extending upward and sleeved on the outer side of the inner fixed cylinder, the interior of the outer heat-insulating sleeve being filled with heat-insulating cotton to reduce the heat transferred from the side wall of the heating furnace to the inner fixed cylinder, and the outer heat-insulating sleeve being connected to the bottom fixing plate of the inner fixed cylinder by bolts;

[0005] The hollow shaft is sequentially sleeved with an upper bearing assembly, a lower bearing assembly, a heat dissipation plate and a carbon sealing ring from top to bottom, and the upper bearing assembly and the lower bearing assembly are both connected to the inner fixed cylinder to support the hollow shaft. The heat dissipation plate is provided with a plurality of heat dissipation holes which are respectively connected with the bottom ends of the center hole of the hollow shaft, so that cold air flows into the center hole of the hollow shaft from the top and flows out from the plurality of heat dissipation holes of the heat dissipation plate. The bottom end of the carbon sealing ring is connected to the upper surface of the bottom fixing plate of the inner fixed cylinder by bolts, and the lower surface of the bottom fixing plate of the inner fixed cylinder is installed with a graphite packing by bolts. The carbon sealing ring and the graphite packing cooperate to seal the butt joint between the hollow shaft and the bottom fixing plate of the inner fixed cylinder. A compressed air pipe and a nitrogen pipe are installed on the inner fixed cylinder, and the air outlet of the nitrogen pipe is connected to the carbon sealing ring so that the carbon sealing ring can be filled with nitrogen for sealing, and the air outlet of the compressed air pipe faces the lower side of the lower bearing assembly so as to blow air to cool the lower bearing assembly.

[0006] Preferably, a pipe support frame for supporting the compressed air pipe and the nitrogen pipe is provided on the inner fixed cylinder.

[0007] Preferably, a heat-insulating annular cavity is formed between the outer annular surface of the inner fixed cylinder and the inner annular surface of the outer heat-insulating sleeve.

[0008] According to the above technical solution, the beneficial effects of the utility model are:

[0009] The utility model arranges an outer heat insulating sleeve on the outer sides of the hollow shaft and the inner fixed cylinder at the same time, and arranges heat preservation cotton inside the outer heat insulating sleeve, which can reduce the heat transferred from the side wall of the heating furnace to the inner fixed cylinder and the hollow shaft, and improves the heat insulation performance. A carbon sealing ring and a graphite packing are arranged at the butt joint between the hollow shaft and the bottom fixing plate of the inner fixed cylinder, and nitrogen is filled into the carbon sealing ring through a nitrogen pipe, which greatly improves the sealing performance, prevents the gas in the furnace from leaking to the hollow shaft, and protects the bearing assembly; a heat sink is arranged between the lower bearing assembly and the carbon sealing ring, and the heat sink cooperates with the center hole of the hollow shaft so that the cooling gas can flow from the top of the hollow shaft to the bottom of the hollow shaft located below the lower bearing assembly, so as to fully cool the bearing assembly, and the lower bearing assembly is also blown and cooled through a compressed air pipe, so as to effectively prevent the bearing assembly from being damaged by heat. The overall structure is compact, and the space occupied is small. In addition, there is no need to adopt a water cooling or oil cooling method. The bearing assembly, the heat sink and the seal can be installed in advance in the fan drive system. After the assembly and debugging are completed in advance, the fan housing is connected, and finally the impeller part is installed to complete the assembly of the whole machine. Not only is the construction convenient, but also the assembly accuracy of the components installed on the fan drive system can be better guaranteed. It is suitable for occasions with compact structure and inconvenient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional schematic diagram of the utility model.

[0011] Markings in the figure: 1. Internal fixed cylinder, 2. External insulation sleeve, 3. Insulation cotton, 4. Hollow shaft, 5. Impeller, 6. Upper bearing assembly, 7. Lower bearing assembly, 8. Heat sink, 9. Carbon sealing ring, 10. Graphite packing, 11. Compressed air pipe, 12. Nitrogen pipe. DETAILED DESCRIPTION

[0012] With reference to the accompanying drawings, the specific implementation is as follows:

[0013] like Figure 1 As shown, an insertable high-temperature fan for a heating furnace comprises a hollow shaft 4 vertically inserted into the side wall of the heating furnace, an impeller 5 is installed at one end of the hollow shaft 4 located inside the heating furnace, the hollow shaft 4 is located inside the inner fixed cylinder 1 and the outer thermal insulation sleeve 2, the hollow shaft 4 passes through the bottom fixing plate of the inner fixed cylinder 1, the lower half of the outer thermal insulation sleeve 2 is sleeved on the hollow shaft 4 located between the side wall of the heating furnace and the bottom fixing plate of the inner fixed cylinder 1, the upper half of the outer thermal insulation sleeve 2 extends upward and is sleeved on the outside of the inner fixed cylinder 1, the interior of the outer thermal insulation sleeve 2 is filled with thermal insulation cotton 3, which can reduce the heat transferred from the side wall of the heating furnace to the inner fixed cylinder 1, the outer thermal insulation sleeve 2 is connected to the bottom fixing plate of the inner fixed cylinder 1 by bolts, and an insulating annular cavity is also formed between the outer annular surface of the inner fixed cylinder 1 and the inner annular surface of the outer thermal insulation sleeve 2.

[0014] like Figure 1 As shown, an upper bearing assembly 6, a lower bearing assembly 7, a heat sink 8 and a carbon sealing ring 9 are sequentially sleeved on the hollow shaft 4 from top to bottom. The upper bearing assembly 6 and the lower bearing assembly 7 are both connected to the inner fixed cylinder 1 to support the hollow shaft 4. The heat sink 8 has a plurality of heat dissipation holes respectively connected to the bottom end of the center hole of the hollow shaft 4, so that the cooling gas can flow from the top of the hollow shaft 4 to the bottom end of the hollow shaft 4 below the lower bearing assembly 7, and flow out from the plurality of heat dissipation holes of the heat sink 8 to fully cool the bearing assembly.

[0015] like Figure 1 As shown, the bottom end of the carbon sealing ring 9 is connected to the upper surface of the bottom fixing plate of the inner fixed cylinder 1 by bolts, and the lower surface of the bottom fixing plate of the inner fixed cylinder 1 is installed with a graphite packing 10 by bolts. The carbon sealing ring 9 and the graphite packing 10 cooperate to seal the joint between the hollow shaft 4 and the bottom fixing plate of the inner fixed cylinder 1, thereby improving the sealing performance, preventing the gas in the furnace from leaking to the hollow shaft 4, and protecting the bearing assembly.

[0016] like Figure 1As shown, a compressed air pipe 11 and a nitrogen pipe 12 are installed on the inner fixed cylinder 1, and a pipe support frame for supporting the compressed air pipe 11 and the nitrogen pipe 12 is provided on the inner fixed cylinder 1. The air outlet of the nitrogen pipe 12 is connected to the carbon sealing ring 9, and the carbon sealing ring 9 can be filled with nitrogen for sealing. The air outlet of the compressed air pipe 11 faces the lower side of the lower bearing assembly 7, and the lower bearing assembly 7 can be blown and cooled. Through the sealing effect of nitrogen and the blowing and cooling effect, the lower bearing assembly 7 close to the side wall of the furnace body can be further prevented from being affected by the heat in the furnace. The overall structure is compact and occupies a small space. There is no need to use water cooling or oil cooling. The bearing assembly can be installed in advance in the fan drive system, and the heat sink and seal can be installed. After the assembly and debugging are completed in advance, the fan housing can be connected, and finally the impeller part can be installed to complete the assembly of the whole machine, and the construction is convenient.

Claims

1. An inserted high temperature fan for a heating furnace, characterized in that: The invention comprises a hollow shaft (4) vertically inserted into the side wall of the heating furnace, an impeller (5) being installed at one end of the hollow shaft (4) located inside the heating furnace, the hollow shaft (4) being located inside the inner fixed cylinder (1) and the outer heat insulation sleeve (2), the hollow shaft (4) passing through the bottom fixing plate of the inner fixed cylinder (1), the lower half of the outer heat insulation sleeve (2) being sleeved on the hollow shaft (4) located between the side wall of the heating furnace and the bottom fixing plate of the inner fixed cylinder (1), the upper half of the outer heat insulation sleeve (2) extending upward and sleeved on the outer side of the inner fixed cylinder (1), the interior of the outer heat insulation sleeve (2) being filled with heat insulation cotton (3) so as to reduce the heat transferred from the side wall of the heating furnace to the inner fixed cylinder (1), and the outer heat insulation sleeve (2) being connected to the bottom fixing plate of the inner fixed cylinder (1) by bolts; An upper bearing assembly (6), a lower bearing assembly (7), a heat sink (8) and a carbon sealing ring (9) are sequentially sleeved on the hollow shaft (4) from top to bottom. The upper bearing assembly (6) and the lower bearing assembly (7) are both connected to the inner fixed cylinder (1) to support the hollow shaft (4). The heat sink (8) has a plurality of heat dissipation holes respectively connected to the bottom ends of the center hole of the hollow shaft (4) so ​​that cold air flows from the top end into the center hole of the hollow shaft (4) and flows out from the plurality of heat dissipation holes of the heat sink (8). The bottom end of the carbon sealing ring (9) is connected to the upper surface of the bottom fixing plate of the inner fixed cylinder (1) by bolts. A graphite packing (10) is installed on the lower surface of the bottom fixing plate of the fixed cylinder (1) by bolts, and the carbon sealing ring (9) and the graphite packing (10) cooperate to seal the joint between the hollow shaft (4) and the bottom fixing plate of the inner fixed cylinder (1). A compressed air pipe (11) and a nitrogen pipe (12) are installed on the inner fixed cylinder (1). The air outlet of the nitrogen pipe (12) is connected to the carbon sealing ring (9) so that the carbon sealing ring (9) is filled with nitrogen for sealing. The air outlet of the compressed air pipe (11) faces the lower side of the lower bearing assembly (7) so that the lower bearing assembly (7) is cooled by air blowing.

2. The plug-in high-temperature fan for a heating furnace according to claim 1, characterized in that: The inner fixed cylinder (1) is provided with a pipe support frame for supporting the compressed air pipe (11) and the nitrogen pipe (12).

3. The plug-in high-temperature fan for a heating furnace according to claim 1, characterized in that: A heat-insulating annular cavity is formed between the outer annular surface of the inner fixed cylinder (1) and the inner annular surface of the outer heat-insulating sleeve (2).

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