Sealing structure for protecting floating end bearing of reaction stirrer of polypropylene device

Abstract

The invention relates to the technical field of polypropylene devices, in particular to a sealing structure for protecting a floating end bearing of a reaction stirrer of a polypropylene device, which comprises a stuffing box, a stuffing gland, stuffing, an air seal ring and a framework lip seal, a left packing set, an air seal ring, a right packing set and a framework lip seal are sequentially arranged in the packing ring groove from left to right. The left packing set, the right packing set and the framework lip seal are arranged in the packing ring groove, the left packing set, the right packing set, the framework lip seal and the main shaft of the reaction stirrer of the polypropylene device achieve dynamic sealing, the propylene purging pipeline is arranged, the gas seal ring purges propylene gas into the packing ring groove, and positive pressure protection is achieved; therefore, powder in the reaction area can be effectively prevented from entering the floating end bearing seat, the purpose of protecting the floating end bearing is achieved, and the service life of the floating end bearing is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of polypropylene devices, in particular to a sealing structure for protecting a floating end bearing of a reaction stirrer of a polypropylene device. Background Art

[0002] In the gas phase polypropylene production process, the reaction agitator is the core equipment of the gas phase polypropylene device. One end of the main shaft of the reaction agitator is connected to the reduction box, and the other end is supported by the floating end bearing for rotation. The floating end bearing is installed on the floating end bearing seat inside the floating end head of the reaction agitator. Under normal circumstances, the floating end bearing and the reaction zone are isolated and sealed by a partition, and the powder in the reaction zone is isolated from the floating end bearing, and the operation of the floating end bearing is not affected. However, as the reaction agitator is used for a long time, the partition seal will be worn to a certain extent, and the powder in the reaction zone will leak to the floating end side and enter the floating end bearing through the seal of the floating end bearing seat. The powder that enters will not only cause the lubrication failure of the floating end bearing, but may also cause the floating end bearing to wear, thereby greatly shortening the service life of the floating end bearing. Taking the horizontal reaction agitator model WN 009100-03 produced by COKE ENGINEERING NV as an example, the period of floating end bearing failure caused by powder leakage in the reaction zone is basically maintained at 10 to 12 months. Summary of the invention

[0003] The present invention provides a sealing structure for protecting the floating end bearing of a polypropylene device reaction agitator, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem of the existing polypropylene device reaction agitator that powder easily enters the floating end bearing, thereby resulting in a short service life of the floating end bearing.

[0004] The technical scheme of the present invention is achieved through the following measures: a sealing structure for protecting the floating end bearing of a reaction agitator of a polypropylene device, comprising a stuffing box, a stuffing gland, a stuffing, a gas seal ring and a skeleton lip seal, wherein the stuffing box is sleeved on the main shaft of the horizontally arranged reaction agitator, a stuffing ring groove is provided on the inner side of the left part of the stuffing box, and a left stuffing group, a gas seal ring, a right stuffing group and a skeleton lip seal are arranged in sequence from left to right in the stuffing ring groove, the gas seal ring comprises an annular body, an outer ring groove is provided on the outer side of the annular body, an inner ring groove is provided on the inner side of the annular body, a plurality of connecting through holes arranged at intervals along the circumference of the annular body are provided on the annular body corresponding to the position between the outer ring groove and the inner ring groove, the outer end of the connecting through hole is connected to the outer ring groove, and the inner end of the connecting through hole is connected to the inner ring groove, a purge gas inlet hole is penetrated on the inner wall of the stuffing ring groove corresponding to the position of the outer ring groove, a propylene purge pipeline is fixedly connected to the purge gas inlet hole, and a stuffing gland is installed in the stuffing ring groove corresponding to the left side of the left stuffing group.

[0005] The following are further optimizations and / or improvements to the above invention: The propylene purge pipeline may be provided with a three-way valve, the third port of the three-way valve is fixedly connected to a discharge pipeline, the discharge pipeline is provided with a discharge valve, and a flow meter is provided on the propylene purge pipeline at a position corresponding to the three-way valve and the purge gas inlet hole.

[0006] There may be two purge gas inlet holes, the central angle of the two purge gas inlet holes corresponding to each other is 180 degrees, the propylene purge pipeline has two outlet ends, and the two outlet ends of the propylene purge pipeline are connected to the two purge gas inlet holes in a one-to-one correspondence.

[0007] The left packing group may include at least two packings arranged on the left and right, and the right packing group may include at least two packings arranged on the left and right.

[0008] The stuffing gland and stuffing box can be fixed together by gland bolts.

[0009] The present invention has a reasonable structure. By arranging a left packing group, a right packing group and a skeleton lip seal in a packing ring groove, the left packing group, the right packing group and the skeleton lip seal realize dynamic sealing with the main shaft of the reaction agitator of the polypropylene device. By arranging a propylene purge pipeline and an air seal ring to purge propylene gas into the packing ring groove, positive pressure protection is achieved, thereby effectively preventing powder in the reaction zone from entering the floating end bearing seat, avoiding the floating end bearing from sliding failure and wear due to the entry of powder, that is, achieving the purpose of protecting the floating end bearing and greatly extending the service life of the floating end bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attached Figure 1 It is a schematic diagram of the main cross-sectional structure of the best embodiment of the present invention.

[0011] Attached Figure 2 For attachment Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0012] The codes in the accompanying drawings are: 1 is a stuffing box, 2 is a stuffing gland, 3 is a skeleton lip seal, 4 is an annular body, 5 is an outer ring groove, 6 is an inner ring groove, 7 is a connecting through hole, 8 is a purge gas inlet hole, 9 is a propylene purge pipeline, 10 is a three-way valve, 11 is a discharge pipeline, 12 is a discharge valve, 13 is a flow meter, 14 is a packing, 15 is a gland bolt, 16 is a main shaft of a reaction agitator, 17 is a floating end bearing, and 18 is a floating end bearing seat. DETAILED DESCRIPTION

[0013] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0014] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0015] The present invention will be further described below in conjunction with embodiments and drawings: As attached Figure 1-2 As shown, the sealing structure for protecting the floating end bearing 17 of the reaction agitator of the polypropylene device comprises a stuffing box 1, a stuffing gland 2, a stuffing, an air seal ring and a skeleton lip seal 3. The stuffing box 1 is sleeved on the main shaft 16 of the horizontally arranged reaction agitator. A stuffing ring groove is provided on the inner side of the left part of the stuffing box 1. A left stuffing group, an air seal ring, a right stuffing group and the skeleton lip seal 3 are arranged in the stuffing ring groove from left to right in sequence. The air seal ring comprises an annular body 4. An outer ring groove 5 is provided on the outer side of the annular body 4. A circle of inner ring grooves 6 are provided on the inner side, and a plurality of connecting through holes 7 arranged at intervals along the circumference of the annular body 4 are provided on the annular body 4 corresponding to the position between the outer ring groove 5 and the inner ring groove 6. The outer ends of the connecting through holes 7 are connected to the outer ring groove 5, and the inner ends of the connecting through holes 7 are connected to the inner ring groove 6. A purge gas inlet hole 8 is penetrated on the inner wall of the packing ring groove corresponding to the position of the outer ring groove 5, and a propylene purge pipeline 9 is fixedly connected to the purge gas inlet hole 8. A packing gland 2 is installed in the packing ring groove corresponding to the left side of the left packing group.

[0016] According to the requirements, the skeleton lip seal 3 can adopt the existing well-known technology, such as it can be a double-lip skeleton oil seal. One end of the main shaft 16 of the existing polypropylene device reaction agitator is connected to the reduction box, and the other end is installed in the floating end bearing 17. The floating end bearing 17 is installed in the floating end bearing seat 18. When the present application is used, the stuffing box 1 is sleeved on the main shaft 16 of the polypropylene device reaction agitator, and the right end of the stuffing box 1 and the floating end bearing seat 18 are sealed and fixed together, and the left packing group, the air seal ring, the right packing group and the skeleton lip seal 3 are sequentially installed in the packing ring groove from left to right, and the left packing group, the right packing group and the skeleton lip seal 3 are tightly held on the main shaft 16 of the reaction agitator, and then the packing gland 2 for pressing the left packing group, the air seal ring, the right packing group and the skeleton lip seal 3 in the packing ring groove is installed, and then the air inlet end of the propylene purge pipeline 9 is connected to the polypropylene device The outside of the reaction agitator is connected to the 2.7MPa clean propylene purge gas, and clean propylene gas is supplied into the propylene purge pipeline 9, and the propylene gas flow rate in the propylene purge pipeline 9 is maintained at 60m³ / h to 100m³ / h. The propylene gas is blown out from the inner ring groove 6 of the gas seal ring. The present application sets a left packing group, a right packing group and a skeleton lip seal 3 in the packing ring groove. The left packing group, the right packing group and the skeleton lip seal 3 realize dynamic sealing with the main shaft 16 of the polypropylene device reaction agitator. The propylene purge pipeline 9 and the gas seal ring are set to purge propylene gas into the packing ring groove, which plays a positive pressure protection role. This can effectively prevent the powder in the reaction zone from entering the floating end bearing seat 18, and avoid the floating end bearing 17 from sliding failure and wear due to the entry of powder, that is, it plays the purpose of protecting the floating end bearing 17 and greatly prolonging the service life of the floating end bearing 17. Specifically, in this embodiment, a mounting ring groove is provided on the outer side of the right end of the stuffing box 1, and the left end of the floating end bearing seat 18 is buckled on the outer side of the right end of the stuffing box 1 through the mounting ring groove to achieve a sealed and fixed installation of the stuffing box 1 and the floating end bearing seat 18. In other embodiments, the right end of the stuffing box 1 and the floating end bearing seat 18 can also be sealed and welded together.

[0017] The above embodiments may be further optimized and / or improved according to actual needs: As attached Figure 1 As shown, a three-way valve 10 is provided on the propylene purge pipeline 9, and a discharge pipeline 11 is fixedly connected to the third port of the three-way valve 10, and a discharge valve 12 is provided on the discharge pipeline 11, and a flow meter 13 is provided on the propylene purge pipeline 9 corresponding to the position between the three-way valve 10 and the purge gas inlet hole 8. This facilitates the adjustment of the propylene gas flow entering the gas seal ring.

[0018] As attached Figure 1 As shown, there are two purge gas inlet holes 8, the central angle of the two purge gas inlet holes 8 is 180 degrees, the propylene purge pipeline 9 has two outlet ends, and the two outlet ends of the propylene purge pipeline 9 are connected to the two purge gas inlet holes 8 one by one. As a result, the gas sealing ring outlet is more uniform.

[0019] As attached Figure 1-2 As shown, the left packing group includes at least two packings 14 arranged on the left and right, and the right packing group includes at least two packings 14 arranged on the left and right. This ensures the dynamic sealing effect between the left and right packing groups and the main shaft. Specifically, the left packing group includes two packings 14 arranged on the left and right, and the right packing group includes two packings 14 arranged on the left and right.

[0020] As attached Figure 1-2 As shown, the packing gland 2 and the stuffing box 1 are fixed together by the gland bolts 15. This facilitates the adjustment of the axial pressing force of the packing gland 2 on the left packing group, the gas seal ring, the right packing group and the skeleton lip seal 3.

[0021] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A sealing structure for protecting the floating end bearing of a polypropylene device reaction agitator, Features It includes a stuffing box, a stuffing gland, stuffing, an air seal ring and a skeleton lip seal. The stuffing box is sleeved on the main shaft of a horizontally arranged reaction agitator. A stuffing ring groove is provided on the inner side of the left part of the stuffing box. A left stuffing group, an air seal ring, a right stuffing group and a skeleton lip seal are arranged in the stuffing ring groove from left to right. The air seal ring includes an annular body. An outer ring groove is provided on the outer side of the annular body, and an inner ring groove is provided on the inner side of the annular body. A plurality of connecting through holes arranged at intervals along the circumference of the annular body are provided on the annular body corresponding to the position between the outer ring groove and the inner ring groove. The outer end of the connecting through hole is connected to the outer ring groove, and the inner end of the connecting through hole is connected to the inner ring groove. A purge gas inlet hole is penetrated on the inner wall of the stuffing ring groove corresponding to the position of the outer ring groove, and a propylene purge pipeline is fixedly connected to the purge gas inlet hole. A stuffing gland is installed in the stuffing ring groove corresponding to the left side of the left stuffing group.

2. The sealing structure for protecting the floating end bearing of the reaction agitator of the polypropylene device according to claim 1, Features A three-way valve is provided on the propylene purge pipeline, the third port of the three-way valve is fixedly connected to a discharge pipeline, a discharge valve is provided on the discharge pipeline, and a flow meter is provided on the propylene purge pipeline at a position corresponding to the three-way valve and the purge gas inlet hole.

3. The sealing structure for protecting the floating end bearing of the reaction agitator of the polypropylene device according to claim 1 or 2, Features There are two purge gas inlet holes, the central angles of the two purge gas inlet holes are 180 degrees, the propylene purge pipeline has two outlet ends, and the two outlet ends of the propylene purge pipeline are connected to the two purge gas inlet holes one by one.

4. The sealing structure for protecting the floating end bearing of the reaction agitator of the polypropylene device according to claim 1 or 2, Features The left packing group includes at least two packings arranged on the left and right, and the right packing group includes at least two packings arranged on the left and right.

5. The sealing structure for protecting the floating end bearing of the reaction agitator of the polypropylene device according to claim 3, Features The left packing group includes at least two packings arranged on the left and right, and the right packing group includes at least two packings arranged on the left and right.

6. The sealing structure for protecting the floating end bearing of the reaction agitator of the polypropylene device according to claim 1, 2 or 5, Features The packing gland and the stuffing box are fixed together by the gland bolts.

7. The sealing structure for protecting the floating end bearing of the reaction agitator of the polypropylene device according to claim 3, Features The packing gland and the stuffing box are fixed together by the gland bolts.

8. The sealing structure for protecting the floating end bearing of the reaction agitator of the polypropylene device according to claim 4, Features The packing gland and the stuffing box are fixed together by the gland bolts.

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