High-speed stable impeller device for compressor
By designing the axial thrust balance airway and sealing structure in the compressor impeller device, the problems of gas leakage and axial force during high-speed rotation are solved, high-speed stable rotation of the impeller and smooth gas compression are achieved, and online balance adjustment is simplified. Extends the service life of the motor.
Patent Information
- Application Number
- CN202420938928.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-30
AI Technical Summary
During the high-speed motor direct drive centrifugal compressor impeller, the gas pressure generates a large axial force during the high-speed rotation, which reduces the service life of the motor thrust bearing, and vibration may occur after the rotor is assembled, which requires multiple disassembly and assembly for balanced calibration. , resulting in risk of assembly accuracy.
A high-speed and stable impeller device for compressors including spindles and impellers is designed. The axial thrust balance airway is formed by setting a balance hole in the axial direction of the impeller, and the spindle and impeller are fixedly connected by an equidistant triangle mounting surface and lock bolts. , combined with the design of the sealing shell and cover, reduces gas leakage and axial thrust, and achieves gas uniformization and sealing through the throttle airway and sealing tooth structure, allowing for trace leakage.
The impeller is realized with high-speed stable rotation and continuous and smooth gas compression, which reduces gas leakage and axial thrust, avoids scratching and friction damage during high-speed rotation, simplifies online balance adjustment, and reduces assembly accuracy failure. risk.
Smart Images
Figure CN222141599U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of high-speed rotating centrifugal impellers, in particular to a high-speed and stable impeller device for a compressor. Background Art
[0002] The impeller of a high-speed motor-driven centrifugal compressor usually adopts a semi-open structure. Due to the high speed, during operation, the impeller rotates at high speed to compress and produce high-temperature and high-pressure gas. A small amount of gas passes through the back of the impeller. Under the action of the gas pressure, a large axial force is generated, which reduces the service life of the high-speed motor thrust bearing. In addition, although the high-speed motor rotor structure is accurately balanced by a dynamic balancing machine, it does not take into account the actual rotor assembly. After the rotor is assembled, it occasionally produces large vibrations. Therefore, the compressor rotor needs to be disassembled and multiple balancing checks are completed. The balancing process is cumbersome and faces the risk of failure of assembly accuracy due to multiple disassembly and assembly.
[0003] Regarding the above-mentioned prior art, the technical personnel in this field have studied how to improve the high-speed rotation stability of the impeller for gas compression and the convenience of online balancing adjustment. Utility Model Content
[0004] The utility model aims to address the defects and shortcomings of the prior art and to provide a high-speed and stable impeller device for a compressor which can realize online dynamic balancing without disassembling the impeller, has a firm connection between the main shaft and the impeller, has a small axial thrust of the impeller, and has a small leakage of compressed gas.
[0005] In order to achieve the above-mentioned purpose, the utility model provides a high-speed and stable impeller device for a compressor, including a main shaft and an impeller connected thereto, blades are arranged on one axial side of the impeller, a cover shell is provided in the gap between the blades, and a sealing shell is provided in the gap between the other axial side of the impeller, an axial thrust balance air passage is formed between the sealing shell, the impeller and the cover shell through a balance hole arranged in the axial direction of the impeller, and an equidistant triangular mounting surface is arranged at the connecting end of the main shaft and the impeller, and the equidistant triangular mounting surface is matched with the inner hole of the impeller and fixedly connected to the main shaft and the impeller through a locking bolt. The high-speed and stable impeller device for the compressor forms an axial thrust balance air passage through a balance hole arranged in the axial direction of the impeller, reduces the air pressure leakage compressed by the impeller rotation and balances the axial thrust on both sides of the impeller axial direction, and realizes the high-speed and stable rotation of the impeller and the continuous and stable compression of the gas.
[0006] The axial thrust balancing air duct includes an air inlet duct located between the cover shell and the impeller, the air inlet area of the air inlet duct is larger than the air outlet area, the air outlet of the air inlet duct is connected to the exhaust air duct formed by the cover shell and the sealing shell, and a balancing air duct formed by the impeller and the sealing shell is provided on the side of the exhaust air duct. The balancing air duct is connected to the air inlet duct through a balancing hole, so that the pressure in the balancing air duct and the air inlet duct is equalized, thereby effectively reducing the axial force of the impeller.
[0007] The air inlet end of the balancing air duct is provided with a throttling air duct, which is formed by the wheel back sealing teeth located on the end face of the impeller and the axial sealing teeth on the sealing shell; the wheel back sealing teeth and the axial sealing teeth are arranged crosswise, and the throttling air duct performs the first sealing and throttling on the gas flowing from the exhaust air duct side, and the gas enters the balancing air duct, and part of the gas is connected to the intake air duct through the balancing hole, thereby reducing the gas pressure in the balancing air duct. The axial sealing teeth are arranged obliquely to cooperate with the wheel back sealing teeth to form a sealed axial gap and a sealed radial gap. The sealed axial gap and the sealed radial gap form a sealed throttling effect in both axial and radial directions.
[0008] A thrust plate is provided between the sealing shell and the main shaft, and a sealing air channel is provided on the axial end face of the thrust plate. The sealing air channel is matched with the sealing shell, and the radial outer periphery of the thrust plate is matched with the shaft end sealing teeth on the inner ring surface of the sealing shell. The shaft end sealing teeth and the thrust plate gap are matched, and the gas in the balance air channel is throttled for the second time through the shaft end sealing teeth, and a small amount of gas is allowed to leak into the environment through the sealing air channel.
[0009] The impeller is provided with a first balancing and deweighting area at one axial end, a second balancing and deweighting area at the other axial end, a third balancing and deweighting area at the radial periphery of the impeller, a disassembly block is provided outside the third balancing and deweighting area, and the disassembly block is connected to the sealing shell by screws. The first balancing and deweighting area and the second balancing and deweighting area are used for the dynamic balancing and deweighting of the impeller to ensure that the impeller is used for deweighting when it is dynamically balanced on a balancing machine. The third balancing and deweighting area is used for assembling the impeller to the compressor for online balancing of the whole machine. The impeller does not need to be disassembled and can be directly balanced and deweighted on the compressor.
[0010] The disassembly block is a semicircular structure, and the matching surface between the disassembly block and the third balancing and deweighting area is an annular structure. The disassembly block can be disassembled and assembled as needed, which is convenient and quick.
[0011] An adjusting gasket is arranged between the thrust plate and the impeller, and the adjusting gasket controls the size of the sealing axial gap and the gap between the blades and the casing.
[0012] By adopting the above-mentioned technical scheme, the compressor uses a high-speed and stable impeller device to form an axial thrust balance air passage through a balance hole arranged in the axial direction of the impeller, thereby further reducing the leakage of gas compressed by the rotation of the impeller, reducing the axial thrust on both sides of the impeller axis, and realizing high-speed and stable rotation of the impeller and continuous and smooth compression of the gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0014] FIG1 is a schematic cross-sectional view of a high-speed and stable impeller device for a compressor of the utility model;
[0015] Figure 2 shows Figure 1 The enlarged structural diagram at A in the middle, the arrows in the figure indicate the gas flow direction;
[0016] Figure 3 shows Figure 1 Schematic diagram of the cross-sectional structure in the middle BB direction;
[0017] FIG4 is a schematic diagram of the three-dimensional structure of the impeller in the utility model;
[0018] FIG5 is a schematic diagram showing the axial force principle of the impeller in the present invention, in which the straight arrows indicate the axial force direction of the impeller, and the curved arrows indicate the gas flow direction. DETAILED DESCRIPTION
[0019] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.
[0020] like Figure 1-5As shown, a high-speed and stable impeller device for a compressor includes a main shaft 9 and an impeller 2 connected thereto, a blade 26 is provided on one axial side of the impeller 2, a cover 4 is provided in the gap between the blade 26, a sealing shell 6 is provided in the gap between the other axial side of the impeller 2, an axial thrust balance air passage is formed between the sealing shell 6, the impeller 2 and the cover 4 through a balance hole 25 provided in the axial direction of the impeller, and an equidistant triangular mounting surface 11 is provided at the connecting end of the main shaft and the impeller, and the equidistant triangular mounting surface is matched with the inner hole of the impeller and fixedly connected to the main shaft and the impeller by a locking bolt 1. The equidistant triangular mounting surface 11 at the connecting end of the main shaft and the impeller effectively improves the connection firmness between the main shaft and the impeller.
[0021] As a preferred structure, the axial thrust balance airway includes an intake airway 3 located between the cover 4 and the impeller 2. The intake port area of the intake airway 3 is larger than the outlet port area. The outlet port of the intake airway 3 is connected to the exhaust airway 5 formed by the cover 4 and the sealing shell 6. The side of the exhaust airway 5 is provided with a balance airway 10 formed by the impeller 2 and the sealing shell 6. The balance airway 10 is connected to the intake airway 3 through the balance hole 25. The axial thrust F2 of the balance airway 10 and the throttle airway is opposite to the axial thrust F0 of the intake airway 3 and the axial thrust F1 of the gap 16, which effectively balances the thrusts on both sides of the impeller 2, and prevents the impeller 2 from scratching and being damaged by friction with stationary parts (such as the cover 4, the axial sealing teeth 62 and the wheel back sealing teeth 24) during high-speed rotation.
[0022] In order to further improve the sealing throttling effect, a throttling airway is provided at the air inlet end of the balancing airway 10, and the throttling airway is formed by the wheel back sealing teeth 24 located on the end face of the impeller 2 and the axial sealing teeth 62 on the sealing shell 6; the wheel back sealing teeth 24 and the axial sealing teeth 62 are arranged crosswise. The axial sealing teeth 62 are arranged obliquely to cooperate with the wheel back sealing teeth 24 to form a sealed axial gap 14 and a sealed radial gap 15.
[0023] As a further sealing means, a thrust plate 7 is provided between the sealing shell 6 and the main shaft 9. The inner annular surface of the sealing shell 6 is provided with an axial end sealing tooth 61. The axial end sealing tooth 61 is clearance-matched with the thrust plate 7. The axial end face of the thrust plate 7 seals the shell 6 to form a sealing air passage 71. The gas in the balance air passage 10 is throttled for the second time through the axial end sealing tooth 61, and a small amount of gas is allowed to leak into the environment through the sealing air passage 71.
[0024] In order to achieve efficient dynamic balancing performance of the impeller, a first balancing de-weighting area 21 is provided at one axial end of the impeller 2, a second balancing de-weighting area 22 is provided at the other axial end of the impeller 2, a third balancing de-weighting area 23 is provided at the radial periphery of the impeller 2, a disassembly block 12 is provided outside the third balancing de-weighting area 23, and the disassembly block 12 is connected to the sealing shell 6 by screws 13. The disassembly block 12 is a semicircular structure, and the mating surface of the disassembly block 12 and the third balancing de-weighting area 23 is an annular structure.
[0025] As a preferred structure, an adjusting gasket 8 is provided between the thrust plate 7 and the impeller 2 , and the adjusting gasket 8 controls the size of the sealing axial gap 14 and the gap 16 between the blade 26 and the casing 4 , thereby improving the installation accuracy among the blade 26 , the casing 4 and the thrust plate 7 .
[0026] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A high-speed and stable impeller device for a compressor, comprising a main shaft (9) and an impeller (2) connected thereto, wherein a blade (26) is provided on one axial side of the impeller (2), a cover shell (4) is provided in a clearance fit between the blade (26), and a sealing shell (6) is provided in a clearance fit between the other axial side of the impeller (2), wherein: An axial thrust balance air passage is formed between the sealing shell (6), the impeller (2) and the cover shell (4) via a balance hole (25) arranged in the axial direction of the impeller. An equidistant triangular mounting surface (11) is provided at the connecting end between the main shaft and the impeller. The equidistant triangular mounting surface is matched with the inner hole of the impeller to fix the main shaft and the impeller via a locking bolt (1).
2. A high-speed and stable impeller device for a compressor according to claim 1, characterized in that: The axial thrust balancing air duct comprises an air inlet duct (3) located between the cover (4) and the impeller (2); the air inlet area of the air inlet duct (3) is larger than the air outlet area; the air outlet of the air inlet duct (3) is connected to an exhaust duct (5) formed by the cover (4) and the sealing shell (6); a balancing air duct (10) formed by the impeller (2) and the sealing shell (6) is provided on the side of the exhaust duct (5); the balancing air duct (10) is connected to the air inlet duct (3) via a balancing hole (25).
3. A high-speed and stable impeller device for a compressor according to claim 2, characterized in that: The air inlet end of the balancing air duct (10) is provided with a throttling air duct, and the throttling air duct is formed by the wheel back sealing teeth (24) located on the end surface of the impeller (2) and the axial sealing teeth (62) on the sealing shell (6); the wheel back sealing teeth (24) and the axial sealing teeth (62) are arranged crosswise.
4. A high-speed and stable impeller device for a compressor according to claim 3, characterized in that: The axial sealing teeth (62) are arranged obliquely to cooperate with the wheel back sealing teeth (24) to form a sealed axial gap (14) and a sealed radial gap (15).
5. The high-speed and stable impeller device for a compressor according to claim 1, characterized in that: A thrust plate (7) is provided between the sealing shell (6) and the main shaft (9), and a sealing air passage (71) is provided on the axial end surface of the thrust plate (7). The sealing air passage (71) is connected to the sealing shell (6) in cooperation. The radial outer periphery of the thrust plate (7) cooperates with the shaft end sealing teeth (61) on the inner annular surface of the sealing shell (6). The shaft end sealing teeth (61) and the thrust plate (7) are clearance-matched. The gas in the balance air passage (10) passes through the shaft end sealing teeth (61) for a second throttling, and a small amount of gas is allowed to leak into the environment through the sealing air passage (71).
6. A high-speed and stable impeller device for a compressor according to claim 1, characterized in that: The impeller (2) is provided with a first balancing deweighting area (21) at one axial end, a second balancing deweighting area (22) at the other axial end, a third balancing deweighting area (23) is provided on the radial outer periphery of the impeller (2), a disassembly block (12) is provided outside the third balancing deweighting area (23), and the disassembly block (12) is connected to the sealing shell (6) via screws (13).
7. A high-speed and stable impeller device for a compressor according to claim 6, characterized in that: The disassembly block (12) is of a semicircular structure, and the mating surface between the disassembly block (12) and the third balancing deweighting area (23) is of an annular structure.
8. The high-speed and stable impeller device for a compressor according to claim 5, characterized in that: An adjusting gasket (8) is provided between the thrust plate (7) and the impeller (2), and the adjusting gasket (8) controls the size of the sealing axial gap (14) and the gap (16) between the blades (26) and the casing (4).