Axial balancing device of centrifugal compressor
By designing a simple axial balance device for centrifugal compressors, the combination of the balance disc and impeller and the sealing disc are used to solve the problem of axial force balance in the magnetic levitation centrifugal compressor, achieving the effect of compact structure, easy processing and efficient assembly.
Patent Information
- Application Number
- CN202422417291.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-10-08
AI Technical Summary
The existing centrifugal compressors have complex structures, inconvenient maintenance and high risk of failure in axial force balance, especially the balance disk device of magnetic levitation centrifugal compressors.
An axial balance device including a housing, a power shaft, an impeller, a balance disc and a sealing disc are designed. The balance disc and the impeller are cooperated through a boss and a concave stage. The sealing disc and the balance disc are combined to prevent gas from flowing. A simple structure and coordination method are adopted to achieve the effect of balancing axial force with the smallest structure.
It realizes efficient balancing of axial forces in magnetic levitation centrifugal compressors, has a compact structure, simple layout, and easy processing and assembly of parts, reducing the risk of failure and improving economic benefits.
Smart Images
Figure CN223049065U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of centrifugal compressors, in particular to an axial balancing device for a centrifugal compressor. Background Art
[0002] A centrifugal compressor is a rotary machine. Under the action of a high-speed rotating impeller, the medium gas obtains velocity energy and pressure energy, and then the velocity energy is further converted into pressure energy through a diffuser to increase the gas pressure. In the actual working process, the rotation speed of the main shaft of the centrifugal compressor is high, and both sides of the impeller are filled with medium gas with a certain pressure, but the pressure distribution is uneven. This pressure difference will cause an axial force to be generated on the centrifugal compressor.
[0003] Under the action of the axial force, it is difficult for the compressor to maintain a normal working state, and in severe cases, it will lead to friction and collision between the rotor components and the stator components. At present, two methods are mostly used to balance the axial force: arranging the impellers in an opposed manner and setting a balance disk. Limited by factors such as structure and cost, the impellers of some centrifugal compressors cannot be arranged in an opposed manner. The balance disk device of the existing magnetic levitation centrifugal compressor has a complex structure and is inconvenient for maintenance, increasing the failure risk of the compressor. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide an axial balancing device for a centrifugal compressor with a simple structure, which makes the parts easy to process and maintain.
[0005] To solve the above technical problem, the technical solution adopted by the utility model is to provide an axial balancing device for a centrifugal compressor, including a housing, a power shaft, an impeller, a balance disk and a sealing disk arranged in the housing;
[0006] The balance disk and the impeller are sequentially sleeved on the power shaft; a convex platform is provided on the end face of the impeller facing the balance disk, and a plurality of concave platforms for cooperating with the convex platform are evenly and symmetrically distributed on the end face of the balance disk cooperating with the impeller; the sealing disk is a stator component fixed on the casing, the outermost radial side of the balance disk is adapted to the sealing disk, and the combination of the sealing disk and the balance disk is used to prevent gas from flowing from the high-pressure side of the gas of the sealing disk to the low-pressure side of the gas.
[0007] Further, in the above axial balancing device for a centrifugal compressor, the radial cross-section of the balance disk is in the shape of "I".
[0008] Further, in the above axial balancing device for a centrifugal compressor, a plurality of key grooves are evenly and symmetrically distributed on the inner diameter of the balance disk, and the balance disk is fixed to the power shaft through the cooperation of the key grooves and keys.
[0009] Further, in the above axial balancing device of the centrifugal compressor, a central through hole is provided on the central axis of the impeller, and the power shaft is in interference fit with the central through hole.
[0010] Further, in the above axial balancing device of the centrifugal compressor, the central through hole is a three-step hole, and the power shaft is in interference fit with the middle step section of the three-step hole.
[0011] Further, in the above axial balancing device of the centrifugal compressor, blades are circumferentially and evenly distributed on the working side of the impeller in an inclined manner, and the blades are curved plate-like structures.
[0012] Further, in the above axial balancing device of the centrifugal compressor, a ring-shaped protrusion is provided on the outermost radial side of the balance disk, and a ring-shaped groove corresponding to the ring-shaped protrusion is provided on the sealing disk.
[0013] Further, in the above axial balancing device of the centrifugal compressor, 5 ring-shaped protrusions are provided on the outermost radial side of the balance disk, and 5 ring-shaped grooves corresponding to the ring-shaped protrusions are provided on the sealing disk.
[0014] Further, in the above axial balancing device of the centrifugal compressor, a plurality of ring-shaped grooves are provided on the outermost radial side of the balance disk, and a plurality of ring-shaped protrusions corresponding to the ring-shaped grooves are provided on the sealing disk.
[0015] Further, in the above axial balancing device of the centrifugal compressor, the cross-section of the ring-shaped groove is V-shaped.
[0016] The beneficial effects of the present utility model are as follows: The axial balancing device of the centrifugal compressor of the present utility model is a related structure for balancing the axial force generated by the impeller on the main shaft of the magnetic levitation centrifugal compressor. It can be arranged behind the last-stage impeller, where the pressure difference inside the motor housing is the largest. Therefore, the smallest related structure can be used to achieve the effect of balancing the same axial force, making the structure of the balance disk compact, the layout simple, and the faults few. Further, the combination of the balance disk, the power shaft, and the impeller of the present utility model adopts a simple fitting method on the premise of ensuring accuracy and usage requirements, making the parts easy to process, the assembly efficiency high, and the economic benefits greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a cross-sectional view of the axial balancing device of the centrifugal compressor according to the specific embodiment of the present utility model;
[0018] Label description:
[0019] 1. Power shaft; 2. Impeller; 3. Balance disk; 4. Sealing disk. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] To describe the technical content, achieved objectives and effects of the present utility model in detail, the following will be described in conjunction with the embodiments and with reference to the accompanying drawings.
[0021] Please refer to Figure 1 , a centrifugal compressor axial balancing device, comprising a housing, a power shaft 1, an impeller 2, a balance disk 3 and a sealing disk 4 arranged in the housing;
[0022] The balance disk 3 and the impeller 2 are sequentially sleeved on the power shaft 1; a convex platform is provided on the end face of the impeller 2 facing the balance disk 3, and a plurality of concave platforms for cooperating with the convex platform are evenly and symmetrically distributed on the end face of the balance disk 3 cooperating with the impeller 2; the sealing disk 4 is a stator element fixed on the casing, the outermost radial side of the balance disk 3 is adapted to the sealing disk 4, and the combination of the sealing disk 4 and the balance disk 3 is used to prevent gas from flowing from the high-pressure side of the gas of the sealing disk to the low-pressure side of the gas.
[0023] The beneficial effects of the present utility model are as follows: The centrifugal compressor axial balancing device of the present utility model, which is a part for balancing the axial force generated by the impeller 2 on the main shaft of the magnetic levitation centrifugal compressor, can be arranged behind the last-stage impeller 2, where the pressure difference inside the motor housing is the largest. Therefore, the smallest relevant structure can be used to achieve the effect of balancing the same axial force, making the structure of the balance disk 3 compact, the layout simple, and the faults few. Further, the cooperation of the balance disk 3 of the present utility model with the power shaft 1 and the impeller 2 adopts a simple cooperation method on the premise of ensuring accuracy and usage requirements, making the parts easy to process, the assembly efficiency high, and the economic benefits greatly improved.
[0024] Further, in the above centrifugal compressor axial balancing device, the radial cross-section of the balance disk 3 is in the shape of "I".
[0025] As described above, the above setting makes the structure of the balance disk 3 simple and the assembly efficiency high.
[0026] Further, in the above centrifugal compressor axial balancing device, a plurality of key grooves are evenly and symmetrically distributed on the inner diameter of the balance disk 3, and the balance disk 3 is fixed to the power shaft 1 through the cooperation of the key grooves and the keys.
[0027] As described above, the above setting makes the structure of the balance disk 3 stable and easy to disassemble.
[0028] Further, in the above centrifugal compressor axial balancing device, a central through hole is provided on the central axis of the impeller 2, and the power shaft 1 is in interference fit with the central through hole.
[0029] As described above, the multi-stage cooperation of the central holes of the power shaft 1 and the impeller 2 facilitates assembly and alignment.
[0030] Further, in the above axial balance device of the centrifugal compressor, the central through hole is a three-step hole, and the power shaft 1 is in interference fit with the middle step section of the three-step hole.
[0031] As can be seen from the above description, the power shaft 1 is in interference fit with the middle section of the central hole of the impeller 2, which not only ensures concentricity but also enables torque transmission.
[0032] Further, in the above axial balance device of the centrifugal compressor, blades are circumferentially and evenly distributed on the working side of the impeller 2 in an inclined manner, and the blades are curved plate-like structures.
[0033] Further, in the above axial balance device of the centrifugal compressor, a ring-shaped protrusion is provided on the outermost radial side of the balance disk 3, and a ring-shaped groove corresponding to the ring-shaped protrusion is provided on the seal disk 4.
[0034] Further, in the above axial balance device of the centrifugal compressor, 5 ring-shaped protrusions are provided on the outermost radial side of the balance disk 3, and 5 ring-shaped grooves corresponding to the ring-shaped protrusions are provided on the seal disk 4.
[0035] Further, in the above axial balance device of the centrifugal compressor, a plurality of ring-shaped grooves are provided on the outermost radial side of the balance disk 3, and a plurality of ring-shaped protrusions corresponding to the ring-shaped grooves are provided on the seal disk 4.
[0036] Further, in the above axial balance device of the centrifugal compressor, the cross-section of the ring-shaped groove is V-shaped.
[0037] Embodiment 1
[0038] Please refer to Figure 1 , this embodiment provides an axial balance device for a centrifugal compressor, which is characterized in that it includes a housing, a power shaft 1, an impeller 2, a balance disk 3, and a seal disk 4 arranged in the housing;
[0039] The balance disk 3 and the impeller 2 are sequentially sleeved on the power shaft 1; a convex platform is provided on the end face of the impeller 2 facing the balance disk 3, and a number of concave platforms for cooperating with the convex platform are evenly and symmetrically distributed on the end face of the balance disk 3 for cooperating with the impeller 2; the seal disk 4 is a stator element fixed on the casing, the outermost radial side of the balance disk 3 is adapted to the seal disk 4, and the combination of the seal disk 4 and the balance disk 3 is used to prevent gas from flowing from the high-pressure side of the gas of the seal disk to the low-pressure side of the gas.
[0040] The radial cross-section of the balance disk 3 is in the shape of a "work" character. A number of key grooves are evenly and symmetrically distributed on the inner diameter of the balance disk 3, and the balance disk 3 is fixed to the power shaft 1 through the cooperation of the key grooves and the keys.
[0041] A central through hole is provided on the central axis of the impeller 2, and the power shaft 1 is in interference fit with the central through hole. The central through hole is a three-step hole, and the power shaft 1 is in interference fit with the middle step section of the three-step hole.
[0042] Blades are circumferentially and evenly distributed on the working side of the impeller 2 in an inclined manner, and the blades are curved plate-like structures.
[0043] Five annular protrusions are provided on the outermost side in the radial direction of the balance disk 3, and five annular grooves corresponding to the annular protrusions are provided on the sealing disk 4. The cross-section of the annular groove is V-shaped.
[0044] The axial balance device of the centrifugal compressor of the present invention is a part for balancing the axial force generated by the impeller on the main shaft of the magnetic levitation centrifugal compressor. It can be arranged behind the last-stage impeller, where the pressure difference inside the motor housing is the largest. Therefore, the smallest relevant structure can be used to achieve the effect of balancing the same axial force, making the structure of the balance disk compact, the layout simple, and the faults few. Further, the cooperation between the balance disk of the present invention and the power shaft and the impeller also reduces the axial vortex and backflow, improving the efficiency.
[0045] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the related technical field, shall be included in the patent protection scope of the present invention by the same token.
Claims
1. An axial balancing device for a centrifugal compressor, characterized in that: It includes a housing, a power shaft, an impeller, a balancing disc and a sealing disc arranged in the housing; The balancing disk and the impeller are sequentially sleeved on the power shaft; a boss is provided on the end face of the impeller facing the balancing disk, and a number of recesses matching with the boss are evenly and symmetrically distributed on the end face of the balancing disk matching with the impeller; the sealing disk is a stator element fixed on the casing, and the radial outermost side of the balancing disk is matched with the sealing disk, and the combination of the sealing disk and the balancing disk is used to prevent gas from flowing from the gas high-pressure side of the sealing disk to the gas low-pressure side.
2. The centrifugal compressor axial balancing device according to claim 1, characterized in that: The radial cross section of the balancing disc is an "I" shape.
3. The centrifugal compressor axial balancing device according to claim 1, characterized in that: A plurality of keyways are evenly and symmetrically distributed on the inner diameter of the balancing disc, and the balancing disc is fixed to the power shaft through the cooperation of the keyways and the keys.
4. The centrifugal compressor axial balancing device according to claim 1, characterized in that: A central through hole is provided on the central axis of the impeller, and the power shaft is interference fit with the central through hole.
5. The centrifugal compressor axial balancing device according to claim 4, characterized in that: The central through hole is a three-step hole, and the power shaft is interference fit with the middle step section of the three-step hole.
6. The centrifugal compressor axial balancing device according to claim 1, characterized in that: The working side of the impeller is evenly distributed with blades in an inclined circumferential direction, and the blades are curved plate-like structures.
7. The centrifugal compressor axial balancing device according to claim 1, characterized in that: An annular protrusion is disposed on the radially outermost side of the balancing disk, and an annular groove corresponding to the annular protrusion is disposed on the sealing disk.
8. The centrifugal compressor axial balancing device according to claim 1, characterized in that: The radial outermost side of the balancing disk is provided with five annular protrusions, and the sealing disk is provided with five annular grooves corresponding to the annular protrusions.
9. The centrifugal compressor axial balancing device according to claim 1, characterized in that: The radial outermost side of the balancing disk is provided with a plurality of annular grooves, and the sealing disk is provided with a plurality of annular protrusions corresponding to the annular grooves.
10. The centrifugal compressor axial balancing device according to claim 9, characterized in that: The cross section of the annular groove is V-shaped.