Uniform heating preheating system for sulfuric acid converter

Abstract

The utility model discloses a sulfuric acid converter uniform heating preheating system, which comprises a uniform heating preheating device main body, the uniform heating preheating device main body comprises a supporting seat, the upper surface of the supporting seat is rotatably provided with a cylinder body through a fixing frame, the outer surface of a driven gear is provided with a preheating heat preservation bin body, and the lower surface of the driven gear is provided with a preheating heat preservation bin body. A driven gear is arranged on the outer surface of one end of the preheating heat preservation bin body. By designing an oil injection lubricating mechanism, when a main motor drives a driving gear to be meshed with the outer surface of a driven gear to rotate, lubricating oil is injected into an oil injection lubricating bin at the joint of the driven gear and the driving gear for lubricating rotation, and scrap iron generated during rotation operation is adsorbed by an adsorption magnet, penetrates through a mounting opening and enters an adsorption box to be collected; generated scrap iron is conveniently adsorbed, friction damage is not prone to being generated during long-time operation, the driving gear is smoothly meshed, rotated and adjusted, the service life is prolonged, and lubricating rotation is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of uniform temperature rise and preheating devices, and in particular relates to a uniform temperature rise and preheating system for a sulfuric acid converter. Background Art

[0002] The sulfuric acid converter uses a chemical absorption method to convert sulfuric acid vapor or sulfuric acid gas in acid mist into liquid sulfuric acid. When the sulfuric acid converter is in operation, it needs to be uniformly heated and preheated. Usually, it is operated by installing a uniform heating and preheating device. The existing uniform heating and preheating device is used for uniform heating and preheating during sulfuric acid processing. When in use, the device facilitates uniform heating and preheating operation and facilitates efficient vertical gas conduction operation. When rotating for uniform heating and preheating, lubrication between the driving gear and the driven gear is required for smooth rotation operation. This improves the convenience of lubrication when the uniform heating and preheating device is installed on the sulfuric acid converter and used for driving.

[0003] According to the authorized patent application No. 202210163221.5, which discloses a preheating device and preheating method for uniformly heating a sulfuric acid converter, it is known that when the existing uniform heating preheating device is used for uniform heating and preheating on a sulfuric acid converter, the motor drives the driving gear to engage with the outer surface of the driven gear to drive the cylinder to rotate for uniform heating operation, and the driven gear and the driving gear are exposed to the outside world and are easily damaged by friction when they are engaged for a long time. When the friction is severe, it may even cause a gap between the driving gear and the driven gear, which is easily damaged when it rotates again under force, affecting the convenience of lubrication when the uniform heating and preheating device is installed on the sulfuric acid converter and used for driving. For this reason, the utility model proposes a uniform heating and preheating system for a sulfuric acid converter. Utility Model Content

[0004] The purpose of the utility model is to provide a uniform temperature rise preheating system for a sulfuric acid converter, so as to solve the problem in the above background technology that the driven gear and the driving gear are easily damaged by friction when they are exposed to the outside world for a long time during meshing operation. When the friction is severe, a gap may even be generated between the driving gear and the driven gear, which may be easily damaged when the driving gear is rotated again under force, thereby affecting the convenience of lubrication when the uniform temperature rise preheating device is installed on the sulfuric acid converter and used.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a uniform temperature rise and preheating system for a sulfuric acid converter, comprising a uniform temperature rise and preheating device body, the uniform temperature rise and preheating device body comprising a support seat, the upper surface of the support seat being rotatably provided with a cylinder via a fixing frame, the outer surface of the driven gear being provided with a preheating and heat preservation bin body, the outer surface of one end of the preheating and heat preservation bin body being provided with a driven gear, a main motor being fixedly mounted on one side of the support seat by bolts, a driving gear being fixedly mounted on the end of the main motor, the driving gear being meshed with the driven gear, a fan blade bin body being provided at one end of the upper surface of the support seat, and the uniform temperature rise and preheating device body being further provided with:

[0006] An oil injection and lubrication mechanism, comprising an oil injection and lubrication assembly disposed on the outer surface of the driving gear, a fixed collection assembly disposed at the bottom end of the oil injection and lubrication assembly, and an adsorption assembly disposed inside the fixed collection assembly;

[0007] A vertical air guide mechanism includes a driving assembly arranged on one side of the fan blade bin body, the end of the driving assembly is located at the top of the fan blade bin body and a vertical air guide assembly is arranged, and the side of the fan blade bin body is provided with an inspection assembly.

[0008] Preferably, a heating chamber is provided inside the support seat, a uniform heating element is provided inside the heating chamber, an air inlet pipe 2 is provided at one end of the support seat, an air inlet pipe 1 is provided at one end of the cylinder, a preheating and heat preservation chamber is provided on the outer surface of the cylinder, an air inlet valve is provided at one end of the upper surface of the cylinder, air distribution pipes are equidistantly provided on the upper surface of the air inlet pipe 1, a spiral tube is provided inside the cylinder, an air guide pipe is provided at the top of the fan blade chamber, the end of the air guide pipe is rotatably connected to the end of the spiral tube by a rotating ring, and the bottom end of the spiral tube is connected to the interior of the heating chamber by a connecting pipe.

[0009] Preferably, the oil injection and lubrication assembly includes an oil injection and lubrication tank fixedly installed at the connection between the driven gear and the driving gear by bolts, and an appropriate amount of lubricating oil is injected into the oil injection and lubrication tank.

[0010] Preferably, the fixed collection component includes a mounting port opened at the middle position of the bottom end of the oil filling and lubrication bin, a sealing gasket 2 is provided inside the mounting port, an adsorption box is sealed and fixed inside the mounting port through the sealing gasket 2, and the side of the adsorption box is fixed to the bottom end of the oil filling and lubrication bin by screws.

[0011] Preferably, the adsorption assembly includes an adsorption magnet fixedly mounted inside the adsorption box by screws, and the end of the adsorption box is consistent with the internal structure of the mounting port.

[0012] Preferably, the driving assembly includes an auxiliary motor fixed to one end of the upper surface of the support seat by bolts, and the end of the auxiliary motor is located inside the fan blade compartment body and is fixedly installed with an active torsion gear.

[0013] Preferably, the vertical air guide assembly includes a hollow mounting frame fixed to the top of the fan blade compartment body by screws, a rotating shaft is provided at the middle position of the hollow mounting frame, the top of the rotating shaft is fixed with a fan blade body by screws, and a driven torsion gear is fixedly installed at the bottom end of the rotating shaft, and the driven torsion gear is meshed with the active torsion gear.

[0014] Preferably, the maintenance assembly includes an inspection port opened on the other side of the fan blade bin body, an externally threaded plunger is rotated inside the inspection port, a sealing gasket 1 is provided at the edge of the inner surface of the externally threaded plunger, and the inner surface of the sealing gasket 1 is in extrusion contact with the surface of the fan blade bin body.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] By designing an oil injection lubrication mechanism, when the main motor drives the driving gear to engage with the outer surface of the driven gear and rotate, lubricating oil is injected into the oil injection lubrication tank at the connection between the driven gear and the driving gear for lubrication and rotation. Iron chips generated during the rotation operation are adsorbed by the adsorption magnet and enter the interior of the adsorption box through the installation port for collection, which is convenient for adsorption and treatment of the generated iron chips. It is not easy to cause friction damage during long-term operation, and the driving gear and the driven gear are smoothly engaged and rotated, thereby extending the service life and improving the convenience of lubrication when the main body of the uniform temperature rise preheating device is installed on the sulfuric acid converter for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 For this utility model Figure 1 A schematic diagram of the enlarged structure of part A;

[0019] Figure 3 This is a schematic diagram of the side cross-sectional structure of the cylinder, driving gear and oil filling lubrication bin of the utility model;

[0020] Figure 4 For this utility model Figure 3 The enlarged structural diagram of part C in the middle;

[0021] Figure 5 For this utility model Figure 1 The enlarged structural diagram of part B in the middle;

[0022] In the figure: 100, uniform heating preheating device body; 101, cylinder; 1011, air inlet pipe 1; 1012, air inlet valve; 1013, spiral tube; 1014, air distribution pipe; 1015, air guide pipe; 1016, preheating and heat preservation chamber; 102, driven gear; 103, fan chamber; 1031, auxiliary motor; 1032, hollow mounting frame; 1033, fan body; 1034, active torsion gear; 1035, Driven torsion gear; 1036, rotating shaft; 1037, sealing gasket 1; 1038, external threaded plunger; 1039, inspection port; 104, support seat; 1041, intake pipe 2; 1042, uniform heating element; 1043, heating chamber; 105, main motor; 106, driving gear; 1061, oil filling and lubrication chamber; 1062, adsorption box; 1063, sealing gasket 2; 1064, installation port; 1065, adsorption magnet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0024] See also Figures 1 to 5 The present invention provides a technical solution: a uniform heating and preheating system for a sulfuric acid converter, comprising a uniform heating and preheating device body 100, the uniform heating and preheating device body 100 comprising a support base 104, the upper surface of the support base 104 being provided with a cylinder 101 which is rotated by a fixing frame, the outer surface of the driven gear 102 being provided with a preheating and heat preservation chamber 1016, when the uniform heating and preheating device body 100 is operated, the smoke to be distributed is introduced through an intake pipe 1011, the intake valve 1012 is opened and the smoke is discharged through the intake pipe 1011, and the smoke is discharged through the intake pipe 1011. The air valve 1012 introduces excess hot steam in the production process, and the air inlet valve 1012 is closed again. The fan blade body 1033 is rotated inside the fan blade bin body 103. A driven gear 102 is provided on the outer surface of one end of the preheating and heat preservation bin body 1016. A main motor 105 is fixedly installed on one side of the support base 104 by bolts. A driving gear 106 is fixedly installed on the end of the main motor 105. The driving gear 106 is meshed with the driven gear 102. The fan blade bin body 103 is provided on one end of the upper surface of the support base 104.

[0025] A heating chamber 1043 is provided inside the support base 104, a uniform heating element 1042 is provided inside the heating chamber 1043, an air inlet pipe 1041 is provided at one end of the support base 104, an air inlet pipe 1011 is provided at one end of the cylinder 101, a preheating and heat preservation chamber 1016 is provided on the outer surface of the cylinder 101, an air inlet valve 1012 is provided at one end of the upper surface of the cylinder 101, an air distribution pipe 1014 is equidistantly provided on the upper surface of the air inlet pipe 1011, a spiral tube 1013 is provided inside the cylinder 101, an air guide pipe 1015 is provided at the top of the fan blade chamber 103, and the end of the air guide pipe 1015 and the end of the spiral tube 1013 are connected by a rotating ring. Rotation connection, the bottom end of the spiral tube 1013 is connected to the interior of the heating chamber 1043 through a connecting pipe, and air enters the interior of the heating chamber 1043 through the second air inlet pipe 1041, and the uniform heating element 1042 is energized for heating, so that the heated air enters the fan chamber 103 and enters the spiral tube 1013 through the air guide pipe 1015. The main motor 105 is operated again to drive the driving gear 106 to rotate and engage with the outer surface of the driven gear 102 to drive the cylinder 101 to rotate. The cylinder 101 rotates and adjusts to evenly distribute the high-temperature steam and fully contact it with the smoke. The air distribution pipe 1014 is opened to discharge it to the outside world. The uniform heating preheating device body 100 is also provided with:

[0026] An oil injection and lubrication mechanism is provided, and the oil injection and lubrication mechanism includes an oil injection and lubrication component arranged on the outer surface of the driving gear 106. A fixed collection component is provided at the bottom end of the oil injection and lubrication component, and an adsorption component is provided inside the fixed collection component. The uniform temperature rise and preheating device body 100 can be lubricated by the oil injection and lubrication mechanism between the rotation of the driving gear 106 and the driven gear 102 during operation, which facilitates lubrication operation, is not prone to friction damage during long-term operation, extends service life, and improves the convenience of lubrication when the uniform temperature rise and preheating device body 100 is installed on the sulfuric acid converter for use and driving.

[0027] In order to facilitate the oiling and lubrication treatment of the connection between the driven gear 102 and the driving gear 106 through the oiling and lubricating assembly, in this embodiment, preferably, the oiling and lubricating assembly includes an oiling and lubricating tank 1061 fixedly installed at the connection between the driven gear 102 and the driving gear 106 by bolts, and an appropriate amount of lubricating oil is injected into the oiling and lubricating tank 1061. When the driving gear 106 and the driven gear 102 engage and rotate, they are contacted with the lubricating oil for lubrication treatment, and friction damage is not easily generated.

[0028] In order to facilitate the adsorption, fixed collection and treatment of the scrap iron generated inside by fixing the collection component and not easily generate friction, in this embodiment, preferably, the fixed collection component includes a mounting port 1064 opened at the middle position of the bottom end of the oil filling and lubrication bin 1061, and a sealing gasket 1063 is provided inside the mounting port 1064. The interior of the mounting port 1064 is sealed and fixed with an adsorption box 1062 through the sealing gasket 1063. The side of the adsorption box 1062 is fixed to the bottom end of the oil filling and lubrication bin 1061 by screws. The adsorption box 1062 can be sealed and closed inside the mounting port 1064 through the sealing gasket 1063, and the adsorption box 1062 is fixedly installed again to facilitate the adsorption and collection of scrap iron inside the adsorption box 1062.

[0029] In order to facilitate the adsorption, collection and treatment of the scrap iron generated inside the oil filling and lubrication bin 1061 through the adsorption component, in this embodiment, preferably, the adsorption component includes an adsorption magnet 1065 fixedly installed inside the adsorption box 1062 by screws, and the end of the adsorption box 1062 is consistent with the internal structure of the installation port 1064, so as to facilitate the adsorption of the scrap iron generated inside the oil filling and lubrication bin 1061 through the installation port 1064 to the interior of the adsorption box 1062 for collection and treatment.

[0030] A vertical air guide mechanism includes a driving assembly arranged on one side of the fan blade bin body 103, the end of the driving assembly is located at the top of the fan blade bin body 103 and is provided with a vertical air guide assembly, and a maintenance assembly is provided on the side of the fan blade bin body 103, so that the vertical air guide mechanism can vertically introduce the hot air inside the fan blade bin body 103 during uniform heating and preheating, thereby facilitating uniform heating and air preheating, improving the vertical air guide effect and maintenance convenience when the uniform heating and preheating device body 100 is installed on the sulfuric acid converter for use, and making it more efficient.

[0031] In order to facilitate the vertical rotation and air conduction processing of the fan blade body 1033 through the driving assembly, in this embodiment, preferably, the driving assembly includes an auxiliary motor 1031 fixed to one end of the upper surface of the support seat 104 by bolts, and the end of the auxiliary motor 1031 is located inside the fan blade housing 103 and is fixedly installed with an active torsion gear 1034. The operation of the auxiliary motor 1031 drives the active torsion gear 1034 to rotate, thereby facilitating the driving operation of the active torsion gear 1034.

[0032] In order to facilitate the vertical introduction of hot air into the fan blade chamber 103 through the vertical air guide component and to efficiently introduce and process it, in this embodiment, preferably, the vertical air guide component includes a hollow mounting frame 1032 fixed to the top of the fan blade chamber 103 by screws, and a rotating shaft 1036 is provided at the middle position of the hollow mounting frame 1032. The top of the rotating shaft 1036 is fixed to the fan blade body 1033 by screws, and the bottom end of the rotating shaft 1036 is fixedly installed with a driven torsion gear 1035, and the driven torsion gear 1035 is meshed with the active torsion gear 1034, so that the active torsion gear 1034 rotates and engages with the outer surface of the driven torsion gear 1035 to drive the rotating shaft 1036 and the fan blade body 1033 to rotate, so that the hot air entering the fan blade chamber 103 is vertically introduced, which is convenient for efficient air guide processing.

[0033] In order to facilitate the disassembly and assembly and maintenance operations of the fan blade housing 103 through the maintenance component, and the disassembly and maintenance are convenient, in this embodiment, preferably, the maintenance component includes an inspection port 1039 opened on the other side of the fan blade housing 103, so as to facilitate the internal inspection and maintenance operations of the fan blade housing 103 through the inspection port 1039, and the maintenance is convenient. An externally threaded plunger 1038 is rotated inside the inspection port 1039, and a sealing gasket 1037 is provided at the edge of the inner surface of the externally threaded plunger 1038. The inner surface of the sealing gasket 1037 is in squeeze contact with the surface of the fan blade housing 103, and after maintenance, the externally threaded plunger 1038 is rotated inside the inspection port 1039 to seal and fix it, so as to facilitate the sealed installation and air guide operation.

[0034] The working principle and use process of the utility model are as follows: before using the uniform heating and preheating system for sulfuric acid converter, the uniform heating and preheating device body 100 is first stably placed in the use position through the support base 104 contacting the ground. When the uniform heating and preheating device body 100 is operated, the smoke to be distributed is introduced through the air inlet pipe 1011, the air inlet valve 1012 is opened, and the excess hot steam in the production process is introduced through the air inlet valve 1012. The air inlet valve 1012 is closed again, and the fan blades are moved inside the fan blade bin 103. The body 1033 rotates, and air enters the interior of the heating chamber 1043 through the second air inlet pipe 1041, and the uniform heating element 1042 is energized for heating, so that the heated air enters the fan chamber 103 and enters the spiral tube 1013 through the air guide pipe 1015. The main motor 105 is turned on again to drive the driving gear 106 to rotate and engage with the outer surface of the driven gear 102 to drive the cylinder 101 to rotate. The cylinder 101 rotates and adjusts to evenly distribute the high-temperature steam and fully contact it with the smoke, and then opens the air distribution pipe 1014 to discharge it to the outside world;

[0035] Then, before the uniform temperature rising and preheating device body 100 is used, the adsorption magnet 1065 is fixed to the inside of the adsorption box 1062, and the adsorption box 1062 is sealed and fixed to the inside of the installation port 1064, and an appropriate amount of lubricating oil is injected into the oil filling and lubrication chamber 1061 again, so that when the main motor 105 drives the driving gear 106 to engage with the outer surface of the driven gear 102 and rotate, the lubricating oil is injected into the connection between the driven gear 102 and the driving gear 106 to lubricate the rotation operation, and the iron chips generated during the rotation operation are adsorbed by the adsorption magnet 1065 through the installation port 1064 and enter the interior of the adsorption box 1062 for collection, so that the generated iron chips are adsorbed and processed, so that the driven gear 102 and the driving gear 106 are lubricated and chip-removed, and friction damage is not easily generated during long-term operation, and the driving gear 106 and the driven gear 102 are smoothly engaged and rotated, thereby extending the service life and improving the convenience of lubrication when the uniform temperature rising and preheating device body 100 is installed on the sulfuric acid converter for use.

[0036] Finally, when the uniform heating and preheating device body 100 is heating and guiding air, the auxiliary motor 1031 is operated to drive the active torsion gear 1034 to rotate and engage with the outer surface of the driven torsion gear 1035 to rotate. When the driven torsion gear 1035 rotates, it drives the rotating shaft 1036 and the fan blade body 1033 to rotate, so that the fan blade body 1033 can be rotated vertically for guiding air. The vertical entry during guiding air is better than the existing air guiding treatment. After a period of use, the external threaded plunger 1038 can be disassembled by rotating the reverse direction inside the inspection port 1039. The internal maintenance can be carried out through the inspection port 1039, which is convenient for maintenance. It also improves the vertical air guiding effect and the convenience of maintenance when the uniform heating and preheating device body 100 is installed on the sulfuric acid converter for use, and is more efficient to use. When in use, the external threaded plunger 1038 is rotated inside the inspection port 1039 and sealed and fixed by the sealing gasket 1037.

[0037] Although the embodiments of the present invention have been shown and described (see the detailed description above for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A uniform heating and preheating system for a sulfuric acid converter, comprising a uniform heating and preheating device body (100), wherein the uniform heating and preheating device body (100) comprises a support base (104), wherein a cylinder (101) is rotatably mounted on the upper surface of the support base (104) via a fixed frame, wherein a main motor (105) is fixedly mounted on one side of the support base (104) via bolts, wherein a driving gear (106) is fixedly mounted on the end of the main motor (105), wherein the driving gear (106) is meshed with a driven gear (102), and a fan blade bin (103) is provided at one end of the upper surface of the support base (104), wherein the fan blade bin (103) is provided at one end of the upper surface of the support base (104), and ... The uniform temperature rise preheating device body (100) is further provided with: An oil injection lubrication mechanism, comprising an oil injection lubrication component arranged on the outer surface of the driving gear (106), a fixed collection component arranged at the bottom end of the oil injection lubrication component, and an adsorption component arranged inside the fixed collection component; A vertical air guide mechanism comprises a drive assembly arranged on one side of a fan silo (103), an end of the drive assembly being located at the top of the interior of the fan silo (103) and a vertical air guide assembly being arranged, and a side surface of the fan silo (103) being provided with an inspection assembly.

2. A uniform temperature rise preheating system for a sulfuric acid converter according to claim 1, characterized in that: A heating chamber (1043) is provided inside the support seat (104), a uniform heating element (1042) is provided inside the heating chamber (1043), an air inlet pipe 2 (1041) is provided at one end of the support seat (104), an air inlet pipe 1 (1011) is provided at one end of the cylinder (101), a preheating and heat preservation chamber (1016) is provided on the outer surface of the cylinder (101), and an air inlet valve (1016) is provided on one end of the upper surface of the cylinder (101). 012), air distribution pipes (1014) are equidistantly arranged on the upper surface of the air inlet pipe (1011), a spiral tube (1013) is arranged inside the cylinder (101), and an air guide pipe (1015) is arranged at the top of the fan chamber (103), the end of the air guide pipe (1015) is rotatably connected to the end of the spiral tube (1013) through a rotating ring, and the bottom end of the spiral tube (1013) is connected to the inside of the heating chamber (1043) through a connecting pipe.

3. The uniform temperature rise preheating system for a sulfuric acid converter according to claim 1, characterized in that: The oil injection lubrication assembly comprises an oil injection lubrication chamber (1061) fixedly mounted at the connection between the driven gear (102) and the driving gear (106) by means of bolts, and a suitable amount of lubricating oil is injected into the oil injection lubrication chamber (1061).

4. A uniform temperature rise preheating system for a sulfuric acid converter according to claim 3, characterized in that: The fixed collection assembly comprises a mounting opening (1064) opened at the middle position of the bottom end of the oil filling and lubrication bin (1061), a second sealing gasket (1063) is provided inside the mounting opening (1064), an adsorption box (1062) is sealed and fixed inside the mounting opening (1064) through the second sealing gasket (1063), and the side of the adsorption box (1062) is fixed to the bottom end of the oil filling and lubrication bin (1061) by screws.

5. A uniform temperature rise preheating system for a sulfuric acid converter according to claim 4, characterized in that: The adsorption assembly includes an adsorption magnet (1065) fixedly mounted inside the adsorption box (1062) by screws, and the end of the adsorption box (1062) is consistent with the internal structure of the mounting port (1064).

6. The uniform temperature rise preheating system for a sulfuric acid converter according to claim 1, characterized in that: The driving assembly comprises an auxiliary motor (1031) fixed to one end of the upper surface of the support seat (104) by means of bolts, and an end of the auxiliary motor (1031) is located inside the fan housing (103) and is fixedly mounted with an active torsion gear (1034).

7. A uniform temperature rise preheating system for a sulfuric acid converter according to claim 6, characterized in that: The vertical air guide assembly comprises a hollow mounting frame (1032) fixed to the top of the fan blade housing (103) by screws, a rotating shaft (1036) is provided at the middle position of the hollow mounting frame (1032), the top of the rotating shaft (1036) is fixed to the fan blade body (1033) by screws, and a driven torsion gear (1035) is fixedly installed at the bottom end of the rotating shaft (1036), and the driven torsion gear (1035) is meshed with the driving torsion gear (1034).

8. The uniform temperature rise preheating system for a sulfuric acid converter according to claim 1, characterized in that: The maintenance component includes an inspection port (1039) opened on the other side of the fan blade housing (103), an external threaded plunger (1038) is rotated inside the inspection port (1039), a sealing gasket (1037) is provided at the edge of the inner surface of the external threaded plunger (1038), and the inner surface of the sealing gasket (1037) is in compression contact with the surface of the fan blade housing (103).

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