Sealing and anti-winding device for balance disc

Abstract

The utility model discloses a balance disc sealing anti-winding device, and particularly relates to the technical field of balance disc sealing, which comprises a partition plate, a cavity is arranged in the center of the partition plate, and a rotor is rotatably connected in the cavity; auxiliary holes facing the center are annularly distributed in the partition plate in a penetrating mode, an air seal groove is formed in the inner ring wall of the partition plate and used for fixing the straight tooth balance disc seal and the helical tooth balance disc seal, and the straight tooth balance disc seal and the helical tooth balance disc seal are provided with air inlet holes communicating with the auxiliary holes and the center cavity; according to the utility model, the structure of the balance disc air seal is improved, the sealing structures of the middle partition plate and the balance disc are optimized, and the helical tooth balance disc seal is arranged, so that the sealing performance of the device is improved, and the defect of insufficient counteracting excitation force caused by large injection leakage amount of high-pressure air in an air seal tooth type is avoided; the straight tooth balance disc is arranged for sealing, the widths of the straight tooth sections are consistent, it is guaranteed that the widths of tooth tips are not changed after abrasion, and the problems that due to widening of air seal teeth, the exciting force becomes large, and a rotor is unstable are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of balance disk seals, and more specifically, to a balance disk seal anti-whirling device. Background Art

[0002] Centrifugal compressors used in petrochemical, natural gas liquefied transportation, nitrogen fertilizer plants, and large-scale energy storage and CCUS projects are continuous operation equipment with high requirements for rotor stability. In order to ensure the stable operation of the rotor and prevent rotor instability caused by gas flow excitation caused by uneven circumferential pressure distribution, a balance disk seal needs to be used.

[0003] However, after the existing balance disk seal air seal teeth are worn, the air seal teeth become wider. When the rotor collides with the air seal due to the widening of the air seal teeth, the rotor instability caused by the increased excitation force leads to serious damage caused by the friction between the rotor and the air seal; and the air seal tooth profile has insufficient excitation force cancellation due to a large leakage of high-pressure gas injection. Summary of the Utility Model

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a balance disk seal anti-whirling device.

[0005] To achieve the above object, the utility model provides the following technical solution: A balance disk seal anti-whirling device includes a partition plate. A cavity is provided in the center of the partition plate. A rotor is rotatably connected inside the cavity. The partition plate is divided into an intermediate partition plate, a wide-body partition plate, and an outlet volute; The partition plate is annularly and throughly provided with process holes facing the center. An air seal groove is opened on the inner ring wall of the partition plate. A block is clamped inside the air seal groove; The block is used to fix the straight-tooth balance disk seal and the helical-tooth balance disk seal. The straight-tooth balance disk seal and the helical-tooth balance disk seal are provided with air inlet holes communicating the process holes and the central cavity;

[0006] The straight-tooth balance disk seal is provided with annular straight teeth on the side facing the center. The straight teeth are distributed on both sides of the air inlet hole; The number of annular straight teeth on one side is small, the gas leakage is large, and the air pressure is high, which is the high-pressure side. The number of annular straight teeth on the other side is large, the gas leakage is small, and the air pressure is low, which is the low-pressure side. The straight-tooth balance disk seal includes a straight-tooth seat fixedly connected to the block. A straight-tooth section with a uniform width is provided inside the straight-tooth seat; The helical-tooth balance disk seal is provided with annular inclined teeth and annular straight teeth on the side facing the center. The inclined teeth and the straight teeth are distributed on both sides of the air inlet hole; The number of inclined teeth on one side is small, the gas leakage is large, and the air pressure is high, which is the high-pressure side. The number of straight teeth on the other side is large, the gas leakage is small, and the air pressure is low, which is the low-pressure side.

[0007] As a further preference of the present utility model, in the straight-tooth balance disk seal, both the high-pressure side seal teeth and the low-pressure side adopt straight teeth. The width of the straight-tooth tip is 0.2 - 0.3 mm, the radial straight-tooth height of the straight-tooth section is 0.5 - 0.6 mm, the height of the straight-tooth seat is 2 - 7 mm, the included angle of the straight-tooth seat is 15 - 20°, the fillet at the bottom of the tooth is 1 - 2 mm, and the distance between the seal teeth is 2 - 6 mm.

[0008] As a further preference of the present utility model, in the helical-tooth balance disk seal, the high-pressure side seal teeth adopt inclined teeth, and the low-pressure side adopts straight teeth. The air-inlet direction of the inclined teeth is an obtuse angle of 110° - 130°, and the air-outlet direction is an acute angle. The thickness of the helical-tooth tip is 0.2 - 0.3 mm, its tooth height is 2 - 7 mm, the fillet at the bottom of its tooth is 1 - 2 mm, the distance between its seal teeth is 2 - 6 mm, and the low-pressure side adopts the straight teeth.

[0009] As a further preference of the present utility model, on the inner ring wall of the partition board, there is an air seal groove, and a straight-tooth balance disk seal or a helical-tooth balance disk seal is installed in the air seal groove. The partition board is provided with a plurality of process holes, which face the central direction, pass through the center of the partition board, and enter the corresponding air seal groove of the partition board, and are distributed at an interval angle of 15 - 20°; the distribution and quantity of the air inlet holes are consistent with the corresponding process holes, and the air inlet holes are inclined in the tangential direction.

[0010] It can be seen from the above structure that the setting of the straight teeth ensures that its width remains unchanged, and avoids the increase of the contact surface, the rise of the friction temperature, and the reduction of the use effect caused by the use of inclined teeth; the setting of the inclined teeth improves the sealing effect and reduces the pressure difference.

[0011] As a further preference of the present utility model, on the inner ring wall of the intermediate partition board, there is an air seal groove, and a straight-tooth balance disk seal is installed in the air seal groove. The air seal groove of the intermediate partition board is centered, and different sealing performances on both sides are provided by different numbers of straight teeth on both sides of the air inlet hole.

[0012] As a further preference of the present utility model, on the inner ring wall of the intermediate partition board, there is an air seal groove, and a helical-tooth balance disk seal is installed in the air seal groove. The air seal groove at the intermediate partition board is centered, and the sealing effect is improved through the setting of the inclined teeth to save space.

[0013] As a further preference of the present utility model, on the inner ring wall of the wide-body partition board, there are two air seal grooves, and a helical-tooth balance disk seal and a straight-tooth balance disk seal are sequentially installed in the air seal grooves. The helical-tooth balance disk seal is installed on the high-pressure side. The axial length of the wide-body partition board is at least twice as long as that of the intermediate partition board, and is used to seal a large rotor. The air inlet hole at the straight-tooth balance disk seal communicates with the low-pressure side of the helical-tooth balance disk seal.

[0014] As a further preference of the present utility model, the inner ring wall of the outlet volute is provided with a gas seal groove, and a straight tooth balance disk seal is installed in the gas seal groove. The gas seal groove at the outlet volute is biased to one side, and the space on one side is relatively large, which is convenient for increasing the number of straight teeth used for sealing on the low-pressure side, increasing the pressure difference between both sides, and increasing the counteracting force.

[0015] As a further preference of the present utility model, an air intake hole is opened on one side of the process hole. The arrangement of the process hole is convenient for processing. After the partition board is installed, the process hole is blocked, and air enters through the air intake hole.

[0016] Technical effects and advantages of the utility model:

[0017] 1. The present utility model improves the structure of the balance disk gas seal and optimizes the intermediate partition board and the balance disk seal structure to adapt to different specifications and requirements for different balancing forces, providing a guarantee for more stable operation for users, thereby improving the production capacity and economic benefits of users;

[0018] 2. By setting an inclined tooth balance disk seal, the sealing performance of the device is improved, avoiding the disadvantage that the air seal tooth profile has insufficient counteracting exciting force due to a large leakage amount caused by high-pressure gas injection, and solving the problem of rotor instability caused by air flow excitation caused by uneven circumferential pressure distribution;

[0019] 3. By setting a straight tooth balance disk seal, the width of the straight tooth section is consistent, ensuring that the width of the tooth tip remains unchanged after wear, improving the stability of the seal, and avoiding the problems of increased exciting force and rotor instability caused by the widening of the air seal teeth. Brief description of the drawings

[0020] Figure 1 It is a schematic structural diagram of a balance disk seal anti-whirlwind device of the present utility model.

[0021] Figure 2 It is a schematic structural diagram of an inclined tooth balance disk seal structure in a balance disk seal anti-whirlwind device of the present utility model.

[0022] Figure 3 It is a schematic structural diagram of a wide-body partition board structure in a balance disk seal anti-whirlwind device of the present utility model.

[0023] Figure 4 It is a schematic structural diagram of an outlet volute in a balance disk seal anti-whirlwind device of the present utility model.

[0024] Figure 5 It is an enlarged view at B in the present utility model.

[0025] Figure 6 It is an enlarged view at A in the present utility model.

[0026] Figure 7 For Figure 1Cross-sectional view at C-C

[0027] The reference numerals are: 1, intermediate partition; 2, air intake hole; 3, process hole; 4, air inlet hole; 5, air seal groove; 6, straight-tooth balance disk seal; 7, helical-tooth balance disk seal; 8, wide-body partition; 9, outlet volute; 501, clamping block; 601, straight-tooth seat; 602, straight-tooth section; 603, straight-tooth tip; 701, inclined tooth; 702, helical-tooth tip. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] Refer to the attached Figures 1-7 As shown, in a balance disk seal anti-whirling device, it includes a partition. A cavity is provided in the center of the partition. A rotor is rotatably connected inside the cavity. The partition is divided into an intermediate partition 1, a wide-body partition 8, and an outlet volute 9. The partition is annularly and throughly provided with process holes 3 facing the center. An air intake hole 2 is opened on one side of the process hole 3. The setting of the process hole 3 facilitates processing. After the partition is installed, the process hole 3 is blocked, and air enters through the air intake hole 2. An air seal groove 5 is opened on the inner ring wall of the partition. A clamping block 501 is clamped inside the air seal groove 5. The clamping block 501 is used to fix the straight-tooth balance disk seal 6 and the helical-tooth balance disk seal 7. The straight-tooth balance disk seal 6 and the helical-tooth balance disk seal 7 are provided with air inlet holes 4 communicating the process hole 3 and the central cavity.

[0030] Refer to Figure 5 As shown, the straight-tooth balance disk seal 6 is provided with a ring of straight teeth facing the center side. The straight teeth are distributed on both sides of the air inlet hole 4. The number of straight teeth on one side is less, the gas leakage is large, and the air pressure is high, which is the high-pressure side. The number of straight teeth on the other side is more, the gas leakage is less, and the air pressure is low, which is the low-pressure side. The straight-tooth balance disk seal 6 includes a straight-tooth seat 601 fixedly connected to the clamping block 501. The inner side of the straight-tooth seat 601 is provided with a straight-tooth section 602 with a consistent width. Both the high-pressure side sealing teeth and the low-pressure side in the straight-tooth balance disk seal 6 adopt straight teeth. The width of the straight-tooth tip 603 is 0.2 - 0.3 mm, the radial straight-tooth height of the straight-tooth section 602 is 0.5 - 0.6 mm, the height of the straight-tooth seat 601 is 2 - 7 mm, the included angle of the straight-tooth seat 601 is 15 - 20°, the fillet at the bottom of the tooth is 1 - 2 mm, and the distance between the sealing teeth is 2 - 6 mm.

[0031] Refer to Figure 6As shown in the figure, the helical balance disk seal 7 is provided with annular inclined teeth 701 and annular straight teeth on the side facing the center. The inclined teeth 701 and the straight teeth are distributed on both sides of the air inlet hole 4. On one side, the number of inclined teeth 701 is small, the gas leakage is large, and the air pressure is high, which is the high-pressure side. On the other side, the number of straight teeth is large, the gas leakage is small, and the air pressure is low, which is the low-pressure side. In the helical balance disk seal 7, the sealing teeth on the high-pressure side adopt inclined teeth 701, and the low-pressure side adopts straight teeth. The air inlet direction of the inclined teeth 701 is an obtuse angle of 110°-130°, and the air outlet direction is an acute angle. The thickness of the tip 702 of the helical teeth is 0.2-0.3 mm, the height of the teeth is 2-7 mm, the fillet at the bottom of the teeth is 1-2 mm, the distance between the sealing teeth is 2-6 mm, and the low-pressure side adopts the straight teeth.

[0032] As Figure 7 shown, in the embodiment of the present invention, the inner ring wall of the partition plate is provided with an air seal groove 5. A straight-tooth balance disk seal 6 or a helical-tooth balance disk seal 7 is installed in the air seal groove 5. The partition plate is provided with a plurality of process holes 3, which face the center direction, pass through the center of the partition plate, and enter the corresponding air seal groove 5 of the partition plate, and are distributed at an interval angle of 15-20°. The distribution and number of the air inlet holes 4 are consistent with the corresponding process holes 3, and the air inlet holes 4 are inclined in the tangential direction.

[0033] As Figure 1 shown, in the first embodiment of the utility model, the inner ring wall of the intermediate partition plate 1 is provided with an air seal groove 5, and a straight-tooth balance disk seal 6 is installed in the air seal groove 5. The air seal groove 5 of the intermediate partition plate 1 is centered. By setting the straight teeth, its width is ensured to be unchanged, and the increase in the contact surface and the rise in the friction temperature caused by using the inclined teeth 701 are avoided, and the use effect is reduced.

[0034] During the working process of this embodiment, the compressed gas enters the air inlet hole 4 through the air guide hole 2, and the air flow is divided into two sides to balance the longitudinal and axial forces. The width of the straight-tooth section 602 is consistent, which ensures that the width of the tooth tip remains unchanged after wear, improves the stability of the seal, and avoids the problems of increased excitation force and rotor instability caused by the widening of the air seal teeth.

[0035] As Figure 2 shown, in the second embodiment of the utility model, the inner ring wall of the intermediate partition plate 1 is provided with an air seal groove 5, and a helical balance disk seal 7 is installed in the air seal groove 5. The air seal groove 5 at the intermediate partition plate 1 is centered. By setting the inclined teeth 701, the sealing effect is improved to save space. The setting of the inclined teeth 701 improves the sealing effect and reduces the pressure difference.

[0036] During the operation of this embodiment, compressed gas enters the air inlet hole 4 through the air guide hole 2. The airflow divides to both sides to balance the longitudinal and axial forces. The width of the straight tooth section 602 is consistent, ensuring that the width of the tooth tip remains unchanged after wear, improving the stability of the seal, and avoiding problems such as increased excitation force and rotor instability caused by the widening of the air seal teeth. The inclined teeth 701 have a good sealing effect and a good axial force effect on the rotor.

[0037] As Figure 3 shown, in the third embodiment of the utility model, for the wide body partition 8, two air seal grooves 5 are provided on its inner ring wall. An inclined tooth balance disk seal 7 and a straight tooth balance disk seal 6 are sequentially installed in the air seal groove 5. The inclined tooth balance disk seal 7 is installed on the high-pressure side. The air inlet hole 4 at the straight tooth balance disk seal 6 is communicated with the low-pressure side of the inclined tooth balance disk seal 7. The axial length of the wide body partition 8 is at least twice as long as that of the intermediate partition 1, and is used to seal a large rotor.

[0038] During the operation of this embodiment, the compressed gas enters the air inlet hole 4 at the inclined tooth balance disk seal 7 through the air guide hole 2 and leads to one side of the rotor. On one side, it passes through the inclined teeth 701, and on the other side, through the straight teeth. It enters the air inlet hole 4 at the straight tooth balance disk seal 6 through the straight teeth at the inclined tooth balance disk seal 7, and then balances the axial force for the second time.

[0039] As Figure 4 shown, in the fourth embodiment of the utility model, for the outlet volute 9, an air seal groove 5 is provided on its inner ring wall. A straight tooth balance disk seal 6 is installed in the air seal groove 5. The air seal groove 5 at the outlet volute 9 is biased to one side, and the space on one side is larger, facilitating an increase in the number of straight teeth for sealing on the low-pressure side, increasing the pressure difference between the two sides, and increasing the axial cancellation force.

[0040] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A balance disk seal anti-whirling device, comprising a partition board, a cavity is arranged at the center of the partition board, and a rotor is rotatably connected inside the cavity, and is characterized in that, The partition plate is divided into an intermediate partition plate, a wide-body partition plate and an outlet volute; the partition plate is annularly provided with process holes facing the center, and an air seal groove is provided on the inner ring wall of the partition plate, and a clamping block is clamped inside the air seal groove; the clamping block is used to fix the straight-tooth balance disk seal and the helical-tooth balance disk seal, and the straight-tooth balance disk seal and the helical-tooth balance disk seal are provided with air inlet holes communicating the process holes and the central cavity. The straight-tooth balance disk seal is provided with annular straight teeth on one side facing the center, and the straight teeth are distributed on both sides of the air inlet hole; the number of annular straight teeth on one side is small, the gas leakage is large, and the air pressure is high, which is the high-pressure side, and the number of annular straight teeth on the other side is large, the gas leakage is small, and the air pressure is low, which is the low-pressure side. The straight-tooth balance disk seal includes a straight-tooth seat fixedly connected to the clamping block, and a straight-tooth section with a uniform width is provided inside the straight-tooth seat; the helical-tooth balance disk seal is provided with annular inclined teeth and annular straight teeth on one side facing the center, and the inclined teeth and the straight teeth are distributed on both sides of the air inlet hole; the number of inclined teeth on one side is small, the gas leakage is large, and the air pressure is high, which is the high-pressure side, and the number of straight teeth on the other side is large, the gas leakage is small, and the air pressure is low, which is the low-pressure side.

2. The anti-whirling device for balance disk seal according to claim 1, characterized in that: In the straight-tooth balance disk seal, both the high-pressure side sealing teeth and the low-pressure side adopt straight teeth. The width of the tooth tip of the straight teeth is 0.2 - 0.3 mm, the radial height of the straight teeth in the straight-tooth section is 0.5 - 0.6 mm, the height of the straight-tooth seat is 2 - 7 mm, the angle of the straight-tooth seat is 15 - 20°, the fillet at the bottom of the tooth is 1 - 2 mm, and the distance between the sealing teeth is 2 - 6 mm.

3. The anti-whirling device for balance disk seal according to claim 2, characterized in that: In the helical-tooth balance disk seal, the high-pressure side sealing teeth adopt inclined teeth, and the low-pressure side adopts straight teeth. The air inlet direction of the inclined teeth is an obtuse angle of 110° - 130°, and the air outlet direction is an acute angle. The thickness of the tooth tip of the helical teeth is 0.2 - 0.3 mm, the height of the teeth is 2 - 7 mm, the fillet at the bottom of the teeth is 1 - 2 mm, the distance between the sealing teeth is 2 - 6 mm, and the low-pressure side adopts the straight teeth.

4. A balance disk seal anti-whirling device according to claim 1, characterized in that: The inner ring wall of the partition plate is provided with an air seal groove, and a straight-tooth balance disk seal or a helical-tooth balance disk seal is installed in the air seal groove. The partition plate is provided with a plurality of process holes, which face the center direction, pass through the center of the partition plate, enter the corresponding air seal groove of the partition plate, and are distributed at an interval angle of 15 - 20°; the distribution and number of the air inlet holes are the same as those of the corresponding process holes, and the air inlet holes are inclined in the tangential direction.

5. A balance disk seal anti-winding device according to claim 1, characterized in that: For the intermediate partition plate, an air seal groove is provided on its inner ring wall, and a straight-tooth balance disk seal is installed in the air seal groove, and the air seal groove in the intermediate partition plate is centered.

6. A balance disk seal anti-whirling device according to claim 1, characterized in that: For the intermediate partition plate, an air seal groove is provided on its inner ring wall, and a helical-tooth balance disk seal is installed in the air seal groove, and the air seal groove at the intermediate partition plate is centered.

7. A balance disk seal anti-whirling device according to claim 1, characterized in that: For the wide-body partition plate, two air seal grooves are provided on its inner ring wall, and a helical-tooth balance disk seal and a straight-tooth balance disk seal are sequentially installed in the air seal grooves. The helical-tooth balance disk seal is installed on the high-pressure side. The axial length of the wide-body partition plate is at least twice as long as that of the intermediate partition plate. The air inlet hole at the straight-tooth balance disk seal communicates with the low-pressure side of the helical-tooth balance disk seal.

8. A balance disk seal anti-whirling device according to claim 1, characterized in that: For the outlet volute, an air seal groove is provided on its inner ring wall, and a straight-tooth balance disk seal is installed in the air seal groove, and the air seal groove at the outlet volute is biased to one side.

9. The anti-whirling device for balance disk seal according to claim 1, wherein: An air guide hole is opened on one side of the process hole.

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