Leak-proof pyrolysis high-temperature solid material conveying device

Abstract

The invention relates to an anti-leakage pyrolysis high-temperature solid material conveying device, and belongs to the technical field of high-temperature solid material conveying. The shell is axially and horizontally placed on the supporting platform; an inlet flange is arranged at the top of the shell, and an outlet flange is arranged at the bottom; the double-chamber leakproof seal is mounted at the axial left end of the shell; the shaft penetrates through the double-chamber leak-proof seal and then extends into the inner cavity of the shell from the left end of the shell; the two bearing seats are fixedly connected to the upper surface of the supporting platform through bolts; the axial outer end of the shaft is supported by two bearing seats; the rotary joint is mounted at the outer end part of the shaft; the access hole is formed in the top of the shell; wear-resistant castable is attached to the inner wall of the access hole, the inner wall of the inlet flange, the inner wall of the outlet flange and the inner wall of the shell; blades are mounted on the outer wall of the shaft extending into the inner cavity of the shell; the transmission part is sleeved on the outer wall of the outer end of the shaft; the high-temperature working condition can be borne when garbage pyrolysis solid materials are conveyed, meanwhile, long-distance material returning in the horizontal direction is achieved, and the garbage pyrolysis material returning problem is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature solid material transportation, and relates to a leakage-proof pyrolysis high-temperature solid material transportation device. Background Art

[0002] With the development of garbage disposal, garbage pyrolysis technology has been developed. Among them, the pyrolysis garbage technology uses a circulating fluidized bed to heat a solid heat carrier, and then uses the solid heat carrier to pyrolyze the garbage. The high-temperature solid material after pyrolysis is a mixture of heat carrier, residual carbon, dust and bulk inorganic matter, etc. The above-mentioned bulk inorganic matter includes metals, bricks and tiles, etc. The high-temperature solid material needs to enter the furnace through a return device for heating and incineration before completing the solid heat carrier cycle.

[0003] In general circulating fluidized bed boiler systems, non-mechanical valves such as L valves and J valves are usually used to push solid particles only by gas; mechanical valves such as butterfly valves and gate valves are used in small quantities to control solid particles by valve action. However, for garbage pyrolysis devices, the composition of garbage after pyrolysis is complex, and some high-temperature pyrolysis gases will enter the return material along with pyrolysis carbon residues. Problems will occur during the return process: non-mechanical valves usually have sealing leakage problems; dust in high-temperature solid materials will enter the gap of the rotating shaft, causing the shaft seal to fail.

[0004] In addition, if the existing high-temperature rotary valve is used, although the valve material is heat-resistant stainless steel, the central axis is cooled with water, and high-temperature resistant bearings are selected, it can withstand high temperature conditions. However, when transporting solid materials from garbage pyrolysis, the following problems still exist:

[0005] The high-temperature rotary valve has a limited space for returning materials, and the distance from the inlet to the outlet is limited. It cannot return materials over a long distance in the horizontal direction and cannot meet the use requirements. Summary of the invention

[0006] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and propose a leakage-proof pyrolysis high-temperature solid material conveying device, which can withstand high temperature conditions when conveying garbage pyrolysis solid materials, and at the same time realize long-distance material return in the horizontal direction, solving the problem of garbage pyrolysis material return.

[0007] The solution of the present invention is:

[0008] A leakage-proof pyrolysis high-temperature solid material conveying device, comprising a rotary joint, two bearing seats, a double-chamber leakage-proof seal, an inlet flange, a shell, an inspection port, a shaft, a wear-resistant casting material, blades, a support platform, an outlet flange, and a transmission part;

[0009] Among them, the supporting platform is placed horizontally; the shell is placed axially horizontally on the supporting platform; an inlet flange is arranged on the top of the shell; an outlet flange is arranged on the bottom of the shell; the inlet flange and the outlet flange are both connected to the inner cavity of the shell; the double-chamber anti-leakage seal is installed at the axial left end of the shell; the shaft passes through the double-chamber anti-leakage seal and extends into the inner cavity of the shell from the left end of the shell; two bearing seats are fixed on the upper surface of the supporting platform by bolts; the axial outer end of the shaft is supported by two bearing seats; the rotary joint is installed on the outer end of the shaft; the inspection port is arranged on the top of the shell; the inner wall of the inspection port, the inner wall of the inlet flange, the inner wall of the outlet flange and the inner wall of the shell are all attached with wear-resistant castables; blades are installed on the outer wall of the part of the shaft extending into the inner cavity of the shell; the transmission part is sleeved on the outer wall of the outer end of the shaft.

[0010] In the above-mentioned leakage-proof pyrolysis high-temperature solid material conveying device, the support platform supports the shell, and the outlet flange is higher than the bottom of the support platform.

[0011] In the above-mentioned leakage-proof pyrolysis high-temperature solid material conveying device, the shaft extending into the inner cavity of the shell is suspended by means of two bearing seat supports.

[0012] In the above-mentioned leakage-proof pyrolysis high-temperature solid material conveying device, the transmission part is located between the rotary joint and the bearing seat; the transmission part is fixed on the shaft by tensioning; and the transmission part provides a rotational power source for the shaft.

[0013] In the above-mentioned leakage-proof pyrolysis high-temperature solid material conveying device, the wear-resistant castable is arranged by a high-temperature wear-resistant double-layer castable; it includes a wear-resistant layer and a thermal insulation layer; the thermal insulation layer is attached to the inner wall of the inspection port, the inner wall of the inlet flange and the inner wall of the outlet flange, and the inner wall of the shell; the wear-resistant layer is attached to the inner wall of the thermal insulation layer.

[0014] In the above-mentioned leakage-proof pyrolysis high-temperature solid material conveying device, the wear-resistant layer adopts 90mm corundum mullite castable material with wear resistance ≤7.0cc and thermal conductivity ≤1.6W / m·K at 600°C; the insulation layer adopts 150mm lightweight castable material with thermal conductivity ≤0.25W / m·K at 600°C.

[0015] In the above-mentioned leakage-proof pyrolysis high-temperature solid material conveying device, the spacing of the blades gradually changes along the axial direction of the shaft, and the spacing of the blades gradually increases from close to the double-chamber leakage-proof sealing end to away from the double-chamber leakage-proof sealing end.

[0016] In the above-mentioned anti-leakage pyrolysis high-temperature solid material conveying device, the working process of the solid material conveying device is:

[0017] External high-temperature solid materials enter the inner cavity of the shell from the inlet flange; the transmission part drives the shaft to rotate, and drives the blades to rotate; since the pitch of the blades below the inlet flange is small, the conveying speed is low; during the conveying process, the external high-temperature solid materials first fill the space below the inlet flange; in the process of the external high-temperature solid materials moving forward along the axial direction, the pitch of the blades on the shaft increases, the conveying speed increases, and the filling rate decreases; after the external high-temperature solid materials are conveyed to the outlet flange position, they fall into the next equipment under the action of gravity; the double-chamber anti-leakage seal is used to prevent the leakage of external high-temperature solid materials and external high-temperature solid materials accompanied by high-temperature gases; the wear-resistant castable is used to achieve wear protection for the external high-temperature solid materials, while preventing heat loss and reducing the cooling of the external high-temperature solid materials in the inner cavity of the shell.

[0018] In the above-mentioned leakage-proof pyrolysis high-temperature solid material conveying device, the double-chamber leakage-proof seal includes a first set of sealing devices and a second set of seals; the first set of sealing devices, the second set of seals, and the shell are coaxially butted in sequence.

[0019] In the above-mentioned anti-leakage pyrolysis high-temperature solid material conveying device, the second set of sealing devices includes a second air connection pipe, a second pressing piece, a second sealing chamber, a second packing set, a second bolt, and a second sealing cavity;

[0020] The second sealing cavity is axially arranged horizontally; the second sealing chamber is arranged in the inner cavity of the second sealing cavity, and the second sealing chamber is butted with the shaft end of the housing; the second packing group is installed between the second sealing chamber and the shaft; the second pressing piece is sleeved on the outer wall of the shaft, and the second packing group is compressed by the second pressing piece; after compression, the second pressing piece is fixed by the second bolts distributed circumferentially; the second air connection pipe is vertically arranged at the top of the second sealing cavity;

[0021] The first set of sealing devices includes a first bolt, a first pressing piece, a first sealing cavity, a first air connection pipe, a first sealing chamber, a first packing set, and a skeleton oil seal;

[0022] Among them, the first sealing cavity is axially arranged horizontally; the first sealing cavity is coaxially connected with the second sealing cavity; the first sealing chamber is arranged in the inner cavity of the first sealing cavity, and the first sealing chamber is connected with the axial end of the second sealing cavity; the first packing group is installed between the first sealing chamber and the shaft; the first pressing piece is sleeved on the outer wall of the shaft, and the first packing group is compressed by the first pressing piece; after compression, the first pressing piece is fixed by the first bolts distributed circumferentially; the first air pipe is vertically arranged at the top of the first sealing cavity; the skeleton oil seal is arranged at the joint between the first sealing chamber and the second sealing cavity to add a seal.

[0023] The beneficial effects of the present invention compared with the prior art are:

[0024] (1) The present invention adopts a cantilever shaft variable pitch structure. The pitch of the conveying equipment can be determined according to production needs. Under the condition of a certain rotation speed, generally speaking, the smaller the pitch, the lower the efficiency and the slower the conveying speed. A small pitch is used at the entrance to control the feeding speed, and a large pitch is used in other places to increase the conveying speed. Due to the small pitch at the entrance, the conveying speed is low at the same rotation speed, and the filling rate at the entrance is 100%. The small pitch can effectively control the amount of material entering the equipment, and the large pitch is used in other places to improve the conveying efficiency and reduce the filling rate. At the same time, a cantilever structure is adopted, and a supporting structure is installed only at the left end. This structure can effectively prevent the strip material from being entangled on the spiral;

[0025] (2) The present invention adopts a double-chamber anti-leakage sealing structure, which is divided into left and right double-chamber seals. The double chambers are connected in series to form two seals. A packing seal is used in each sealing chamber, and a skeleton oil seal is added between the two seals to form an intermediate seal. Even if all the above seals fail, the gas seals in the two chambers can be used to effectively improve the sealing performance of the device;

[0026] (3) The present invention lays high-temperature wear-resistant castable inside the shell to significantly enhance the wear resistance of the equipment. The high-temperature wear-resistant castable adopts a double-layer castable layout, the layer in contact with the material is a wear-resistant layer, and the other layer is a thermal insulation layer. At 600°C, the thermal conductivity of the thermal insulation layer material is no more than 1.5W / m·K, and the wear resistance of the wear-resistant layer is no more than 15cc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram of the high-temperature solid material conveying device of the present invention;

[0028] Figure 2 It is a schematic diagram of the double-chamber anti-leakage sealing structure of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the embodiments.

[0030] The present invention provides a leakage-proof pyrolysis high-temperature solid material conveying device, which can withstand high-temperature conditions when conveying garbage pyrolysis solid materials, and at the same time realize long-distance material return in the horizontal direction, thus solving the problem of garbage pyrolysis material return.

[0031] Leakage-proof pyrolysis high-temperature solid material conveying device, such as Figure 1As shown, it specifically includes a rotary joint 1, two bearing seats 2, a double-chamber anti-leakage seal 3, an inlet flange 4, a shell 5, an inspection port 6, a shaft 7, a wear-resistant castable 8, blades 9, a support platform 10, an outlet flange 11, and a transmission part 12. Among them, the support platform 10 is placed horizontally; the shell 5 is placed axially horizontally on the support platform 10; an inlet flange 4 is arranged on the top of the shell 5; an outlet flange 11 is arranged on the bottom of the shell 5; the inlet flange 4 and the outlet flange 11 are both connected to the inner cavity of the shell 5; the double-chamber anti-leakage seal 3 is installed at the axial left end of the shell 5; the shaft 7 passes through the double-chamber anti-leakage seal 3 and extends into the inner cavity of the shell 5 from the left end of the shell 5; two bearing seats 2 are fixed to the upper surface of the support platform 10 by bolt connection; the axial outer end of the shaft 7 is supported by two bearing seats 2; the rotary joint 1 is installed on the outer end of the shaft 7; the inspection port 6 is arranged on the top of the shell 5; the inner wall of the inspection port 6, the inner wall of the inlet flange 4, the inner wall of the outlet flange 11, and the inner wall of the shell 5 are all attached with wear-resistant castable 8; the outer wall of the part of the shaft 7 extending into the inner cavity of the shell 5 is installed with blades 9; the transmission part 12 is sleeved on the outer wall of the outer end of the shaft 7.

[0032] The supporting platform 10 supports the housing 5, and the outlet flange 11 is higher than the bottom of the supporting platform 10. The two bearing seats 2 support the shaft 7 so that the part extending into the inner cavity of the housing 5 is suspended.

[0033] The transmission part 12 is located between the rotary joint 1 and the bearing seat 2 ; the transmission part 12 is fixed on the shaft 7 by tensioning; and the transmission part 12 provides a rotational power source for the shaft 7 .

[0034] The wear-resistant castable 8 is set up with a high-temperature wear-resistant double-layer castable; including a wear-resistant layer and a thermal insulation layer; the thermal insulation layer is attached to the inner wall of the inspection port 6, the inner wall of the inlet flange 4 and the inner wall of the outlet flange 11, and the inner wall of the shell 5; the wear-resistant layer is attached to the inner wall of the thermal insulation layer. The wear-resistant layer adopts 90mm corundum mullite castable, with a wear resistance of ≤7.0cc and a thermal conductivity of ≤1.6W / m·K at 600℃; the thermal insulation layer adopts 150mm lightweight castable, with a thermal conductivity of ≤0.25W / m·K at 600℃.

[0035] The spacing between the blades 9 changes gradually along the axial direction of the shaft 7 , and the spacing between the blades 9 increases gradually from the end close to the double-chamber anti-leakage seal 3 to the end far away from the double-chamber anti-leakage seal 3 .

[0036] The working process of the solid material conveying device is:

[0037] External high-temperature solid materials enter the inner cavity of the shell 5 from the inlet flange 4; the transmission part 12 drives the shaft 7 to rotate, and drives the blades 9 to rotate; since the pitch of the blades 9 below the inlet flange 4 is small, the conveying speed is low; during the conveying process, the external high-temperature solid materials first fill the space below the inlet flange 4; in the process of the external high-temperature solid materials moving forward along the axial direction, the pitch of the blades 9 on the shaft 7 increases, the conveying speed increases, and the filling rate decreases; after the external high-temperature solid materials are conveyed to the position of the outlet flange 11, they fall into the next equipment under the action of gravity; the double-chamber anti-leakage seal 3 is used to prevent the leakage of external high-temperature solid materials and external high-temperature solid materials accompanied by high-temperature gases; the wear-resistant castable 8 is used to achieve wear protection of the external high-temperature solid materials, while preventing heat loss and reducing the cooling of the external high-temperature solid materials in the inner cavity of the shell 5.

[0038] The double-chamber anti-leakage seal 3 includes a first set of sealing devices 3-a and a second set of sealing devices 3-b; the first set of sealing devices 3-a, the second set of sealing devices 3-b, and the shell 5 are coaxially connected in sequence.

[0039] like Figure 2 As shown, the second set of sealing device 3-b includes a second air connection pipe 3-7, a second pressure piece 3-8, a second sealing chamber 3-9, a second packing group 3-10, a second bolt 3-11, and a second sealing cavity 3-12. Among them, the second sealing cavity 3-12 is axially arranged horizontally; the second sealing chamber 3-9 is arranged in the inner cavity of the second sealing cavity 3-12, and the second sealing chamber 3-9 is connected to the axial end of the housing 5; the second packing group 3-10 is installed between the second sealing chamber 3-9 and the shaft 7; the second pressure piece 3-8 is sleeved on the outer wall of the shaft 7, and the second packing group 3-10 is compressed by the second pressure piece 3-8; after compression, the second pressure piece 3-8 is fixed by the circumferentially distributed second bolts 3-11; the second air connection pipe 3-7 is vertically arranged at the top of the second sealing cavity 3-12.

[0040] The first sealing device 3-a includes a first bolt 3-1, a first pressure piece 3-2, a first sealing cavity 3-3, a first air connection pipe 3-4, a first sealing chamber 3-5, a first packing group 3-6, and a skeleton oil seal 3-13. Among them, the first sealing cavity 3-3 is axially arranged horizontally; the first sealing cavity 3-3 is coaxially docked with the second sealing cavity 3-12; the first sealing chamber 3-5 is arranged in the inner cavity of the first sealing cavity 3-3, and the first sealing chamber 3-5 is docked with the axial end of the second sealing cavity 3-12; the first packing group 3-6 is installed between the first sealing chamber 3-5 and the shaft 7; the first pressure piece 3-2 is sleeved on the outer wall of the shaft 7, and the first packing group 3-6 is compressed by the first pressure piece 3-2; after compression, the first pressure piece 3-2 is fixed by the circumferentially distributed first bolts 3-1; the first air connecting pipe 3-4 is vertically arranged on the top of the first sealing cavity 3-3; the skeleton oil seal 3-13 is arranged at the docking point between the first sealing chamber 3-5 and the second sealing cavity 3-12 to add a seal.

[0041] The present invention adopts a cantilever shaft variable pitch structure. The pitch of the conveying equipment can be determined according to production needs. Under the condition of a certain rotation speed, generally speaking, the smaller the pitch, the lower the efficiency and the slower the conveying speed. A small pitch is used at the entrance to control the feeding speed, and a large pitch is used in other places to increase the conveying speed. Due to the small pitch at the entrance, the conveying speed is low at the same rotation speed, and the filling rate at the entrance is 100%. The small pitch can effectively control the amount of material entering the equipment, and the large pitch is used in other places to improve the conveying efficiency and reduce the filling rate. At the same time, a cantilever structure is adopted, and a support structure is installed only at the left end. This structure can effectively prevent the strip material from winding on the spiral.

[0042] The present invention adopts a double-chamber anti-leakage sealing structure, which is divided into left and right double-chamber seals. The double chambers are connected in series to form two seals. A packing seal is adopted in each sealing chamber, and a skeleton oil seal is added between the two seals to form an intermediate seal. Even if all the above seals fail, the gas seals in the two chambers can be adopted respectively, thereby effectively improving the sealing performance of the device.

[0043] The present invention lays high-temperature wear-resistant castable inside the shell to significantly enhance the wear resistance of the equipment. The high-temperature wear-resistant castable adopts a double-layer castable layout, the part in contact with the material is a wear-resistant layer, and the other layer is a thermal insulation layer. At 600°C, the thermal conductivity of the thermal insulation layer material is not more than 1.5W / m·K, and the wear resistance of the wear-resistant layer is not more than 15cc.

[0044] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A leakage-proof pyrolysis high-temperature solid material conveying device, characterized in that: It comprises a rotary joint (1), two bearing seats (2), a double-chamber anti-leakage seal (3), an inlet flange (4), a housing (5), an inspection port (6), a shaft (7), a wear-resistant castable (8), blades (9), a support platform (10), an outlet flange (11), and a transmission part (12); The support platform (10) is placed horizontally; the shell (5) is placed axially horizontally on the support platform (10); an inlet flange (4) is arranged on the top of the shell (5); an outlet flange (11) is arranged on the bottom of the shell (5); the inlet flange (4) and the outlet flange (11) are both connected to the inner cavity of the shell (5); a double-chamber anti-leakage seal (3) is installed at the axial left end of the shell (5); the shaft (7) passes through the double-chamber anti-leakage seal (3) and then extends into the inner cavity of the shell (5) from the left end; two bearing seats (2) are connected The housing (5) is fixed to the upper surface of the support platform (10) by bolt connection; the axial outer end of the shaft (7) is supported by two bearing seats (2); the rotary joint (1) is installed on the outer end of the shaft (7); the inspection port (6) is arranged on the top of the housing (5); the inner wall of the inspection port (6), the inner wall of the inlet flange (4), the inner wall of the outlet flange (11), and the inner wall of the housing (5) are all attached with wear-resistant castable (8); the outer wall of the shaft (7) extending into the inner cavity of the housing (5) is installed with a blade (9); the transmission part (12) is sleeved on the outer wall of the outer end of the shaft (7).

2. The anti-leakage pyrolysis high-temperature solid material conveying device according to claim 1, characterized in that: The support platform (10) supports the shell (5), and the outlet flange (11) is higher than the bottom of the support platform (10).

3. The anti-leakage pyrolysis high-temperature solid material conveying device according to claim 1, characterized in that: The two bearing seats (2) are used to support the shaft (7) so that the part extending into the inner cavity of the housing (5) is suspended in the air.

4. The anti-leakage pyrolysis high-temperature solid material conveying device according to claim 1, characterized in that: The transmission part (12) is located between the rotary joint (1) and the bearing seat (2); the transmission part (12) is fixed on the shaft (7) by tensioning; and a rotational power source is provided for the shaft (7) through the transmission part (12).

5. The anti-leakage pyrolysis high-temperature solid material conveying device according to claim 1, characterized in that: The wear-resistant castable (8) is configured as a high-temperature wear-resistant double-layer castable; it includes a wear-resistant layer and a thermal insulation layer; the thermal insulation layer is attached to the inner wall of the inspection port (6), the inner wall of the inlet flange (4), the inner wall of the outlet flange (11), and the inner wall of the shell (5); the wear-resistant layer is attached to the inner wall of the thermal insulation layer.

6. The leakage-proof pyrolysis high-temperature solid material conveying device according to claim 5, characterized in that: The wear-resistant layer adopts 90mm corundum mullite castable material, with wear resistance ≤7.0cc and thermal conductivity ≤1.6W / m·K at 600°C; the insulation layer adopts 150mm lightweight castable material, with thermal conductivity ≤0.25W / m·K at 600°C.

7. The anti-leakage pyrolysis high-temperature solid material conveying device according to claim 5, characterized in that: The spacing between the blades (9) changes gradually along the axial direction of the shaft (7), and the spacing between the blades (9) gradually increases from the end close to the double-chamber anti-leakage seal (3) to the end away from the double-chamber anti-leakage seal (3).

8. The leakage-proof pyrolysis high-temperature solid material conveying device according to claim 7, characterized in that: The working process of the solid material conveying device is: External high-temperature solid material enters the inner cavity of the shell (5) from the inlet flange (4); the transmission part (12) drives the shaft (7) to rotate, and drives the blades (9) to rotate; because the pitch of the blades (9) below the inlet flange (4) is small, the conveying speed is low; during the conveying process, the external high-temperature solid material first fills the space below the inlet flange (4); during the external high-temperature solid material moving forward along the axial direction, the pitch of the blades (9) on the shaft (7) increases, the conveying speed increases, and the filling rate decreases; after the external high-temperature solid material is conveyed to the position of the outlet flange (11), it falls into the next device under the action of gravity; the double-chamber anti-leakage seal (3) prevents the leakage of the external high-temperature solid material and the high-temperature gas accompanying the external high-temperature solid material; the wear-resistant castable (8) realizes the wear protection of the external high-temperature solid material, and at the same time prevents heat loss, thereby reducing the cooling of the external high-temperature solid material in the inner cavity of the shell (5).

9. The anti-leakage pyrolysis high-temperature solid material conveying device according to claim 8, characterized in that: The double-chamber anti-leakage seal (3) comprises a first set of sealing devices (3-a) and a second set of sealing devices (3-b); the first set of sealing devices (3-a), the second set of sealing devices (3-b) and the housing (5) are coaxially butt-jointed in sequence.

10. The leakage-proof pyrolysis high-temperature solid material conveying device according to claim 9, characterized in that: The second sealing device (3-b) comprises a second air receiving pipe (3-7), a second pressing piece (3-8), a second sealing chamber (3-9), a second packing set (3-10), a second bolt (3-11), and a second sealing cavity (3-12); The second sealed cavity (3-12) is axially arranged horizontally; the second sealed chamber (3-9) is arranged in the inner cavity of the second sealed cavity (3-12), and the second sealed chamber (3-9) is butt-jointed with the axial end of the housing (5); a second packing group (3-10) is installed between the second sealed chamber (3-9) and the shaft (7); a second pressing piece (3-8) is sleeved on the outer wall of the shaft (7), and the second packing group (3-10) is compressed by the second pressing piece (3-8); after compression, the second pressing piece (3-8) is fixed by second bolts (3-11) distributed in the circumferential direction; and a second air connection pipe (3-7) is vertically arranged at the top of the second sealed cavity (3-12); The first set of sealing devices (3-a) comprises a first bolt (3-1), a first pressing piece (3-2), a first sealing cavity (3-3), a first air connection pipe (3-4), a first sealing chamber (3-5), a first packing set (3-6), and a skeleton oil seal (3-13); The first sealing cavity (3-3) is axially arranged horizontally; the first sealing cavity (3-3) and the second sealing cavity (3-12) are coaxially connected; the first sealing chamber (3-5) is arranged in the inner cavity of the first sealing cavity (3-3), and the axial ends of the first sealing chamber (3-5) and the second sealing cavity (3-12) are connected; the first packing group (3-6) is installed between the first sealing chamber (3-5) and the shaft (7); the first pressing piece (3-2) is sleeved on the outer wall of the shaft (7), and the first packing group (3-6) is compressed by the first pressing piece (3-2); after compression, the first pressing piece (3-2) is fixed by the first bolts (3-1) distributed in the circumferential direction; the first air connection pipe (3-4) is vertically arranged at the top of the first sealing cavity (3-3); the skeleton oil seal (3-13) is arranged at the connection between the first sealing chamber (3-5) and the second sealing cavity (3-12), and an additional seal is provided.

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