Impeller sealing structure of magnetic suspension high-speed centrifugal machine
By meshing with the impeller sealing teeth in the magnetic levitation centrifuge, forming a flow intercepting structure and deriving fluid through the fluid channel, the problem of poor impeller sealing effect in the prior art is solved, significantly reducing the leakage of high-temperature gases and improving the safety and reliability of the equipment.
Patent Information
- Application Number
- CN202421643604.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The impeller sealing effect of the existing magnetic levitation centrifuge structure is poor, resulting in high-temperature gases easily leaking from the impeller side into the motor cavity, causing problems such as overheating of the magnetic levitation bearing and the motor stator, and causing vibration.
An annular sealing structure is adopted, including toothed radial sealing teeth and axial sealing teeth, forming a cut-off structure to mesh with the impeller sealing teeth, increasing the resistance of fluid flowing into the motor cavity, and deriving fluid through the first and second fluid channels to reduce leakage.
It effectively improves the impeller sealing effect, reduces the leakage of high-temperature gas, reduces the risk of overheating of magnetic levitation bearings and motor stator, and avoids problems such as vibration.
Smart Images
Figure CN222782803U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of centrifuges, in particular to an impeller sealing structure of a magnetic suspension high-speed centrifuge. Background Art
[0002] As centrifugal blowers are currently replacing the original Roots blowers and multi-stage centrifugal blowers in various industries, the cooling problem of magnetic suspension motors has gradually been exposed. Under the traditional magnetic suspension centrifuge structure, the fluid becomes a high-temperature and high-pressure fluid after flowing through the impeller, flows out from the gap between the impeller and the front cover of the motor, passes through the gap between the seal and the impeller, and finally enters the motor cavity through the protective bearing. In addition, due to the high temperature and centrifugal force, the impeller is deformed. In order to prevent damage caused by collision between the seal and the impeller, the gap between the seal and the impeller is designed to be larger, resulting in poor sealing effect. A lot of high-temperature gas leaks from the impeller side, causing the magnetic suspension bearing and the motor stator and rotor to overheat, causing the magnetic suspension rotor to vibrate, etc., and then damage occurs. Utility Model Content
[0003] In order to overcome the defects of the prior art, a magnetic levitation high-speed centrifuge impeller sealing structure is provided, which can solve the problems that the impeller sealing structure of the existing magnetic levitation centrifuge structure is poor, a large amount of high-temperature gas is easily leaked from the impeller side into the motor cavity, causing the magnetic levitation bearing and the motor stator and rotor to overheat, and causing the magnetic levitation rotor to vibrate.
[0004] In order to achieve the above technical effects, the solution provided by the utility model is to provide a magnetic suspension high-speed centrifuge impeller sealing structure, which includes:
[0005] An annular seal is installed between the impeller and the front end cover of the motor and sleeved on the rotor. The side of the annular seal facing the impeller is formed with continuous radial sealing teeth along the circumferential direction, and the inner ring wall of the annular seal is formed with continuous axial sealing teeth;
[0006] Impeller sealing teeth are arranged on the side of the impeller facing the annular seal, the impeller sealing teeth are meshed with the radial sealing teeth, a sealing cavity is formed between the annular seal, the rotor and the impeller, a first fluid channel connected to the sealing cavity is provided on the annular seal, and a second fluid channel connected to the first fluid channel to the outside of the centrifuge is provided on the front end cover of the motor.
[0007] Preferably, the radial sealing teeth and the impeller sealing teeth are both helical tooth structures.
[0008] Preferably, the radial sealing teeth are arranged to be inclined inwards.
[0009] Preferably, the axial sealing teeth are straight tooth structures.
[0010] Preferably, the first fluid channel is a through hole, and the through hole axially penetrates the annular sealing panel.
[0011] Preferably, there are multiple perforations, and the multiple perforations are distributed at intervals along the circumferential direction.
[0012] Preferably, the front end cover of the motor is formed with a groove for accommodating the annular seal, and the second fluid channel includes a notch arranged at the bottom of the groove corresponding to the through hole, and a radial through hole connecting the notch to the outside of the centrifuge.
[0013] Preferably, there are a plurality of the slots, and the plurality of slots are distributed at intervals along the circumferential direction.
[0014] Preferably, the number of the radial sealing teeth and the impeller sealing teeth is multiple, the multiple radial sealing teeth are coaxially arranged, the multiple impeller sealing teeth are coaxially arranged, and the number of the impeller sealing teeth is not less than the number of the radial sealing teeth.
[0015] Preferably, there are multiple axial sealing teeth, and the multiple axial sealing teeth are arranged in parallel.
[0016] The beneficial effect of the utility model is that the impeller sealing structure of a magnetic levitation high-speed centrifuge of the utility model adopts a toothed radial labyrinth sealing structure and an impeller sealing tooth to form a retention structure, so as to increase the resistance of the fluid flowing into the motor cavity and reduce the inflow. After the airflow flows through the radial seal interceptor, the leakage rate is further reduced, and the leakage amount is also significantly reduced. The airflow then flows out of the centrifuge through the first fluid channel and the second fluid channel, and the residual gas continues to flow to the axial sealing teeth of the annular seal for sealing to prevent it from flowing into the motor cavity. The sealing effect formed between the utility model and the impeller is good, and can prevent the high-temperature gas leaking from the impeller side from entering the motor cavity. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 The utility model is a partial cross-sectional schematic diagram of the impeller sealing structure of the magnetic suspension high-speed centrifuge installed after the centrifuge.
[0019] Figure 2 The utility model is a schematic structural diagram of an annular seal of an impeller seal structure of a magnetically suspended high-speed centrifuge.
[0020] Figure 3 The utility model is a schematic diagram of the impeller section structure of the impeller sealing structure of the magnetic suspension high-speed centrifuge.
[0021] Figure 4 It is a structural enlarged schematic diagram of radial sealing teeth of annular sealing of the impeller sealing structure of a magnetically suspended high-speed centrifuge of the utility model.
[0022] Figure 5 It is a structural enlarged schematic diagram of the axial sealing teeth of the annular seal of the impeller sealing structure of the magnetic suspension high-speed centrifuge of the utility model.
[0023] Figure 6 The utility model is a structural schematic diagram of the motor front end cover of the impeller sealing structure of the magnetic suspension high-speed centrifuge.
[0024] The corresponding relationship of the numbers in the figure is as follows:
[0025] 1- annular seal; 2- impeller; 3- motor front end cover; 301- groove; 302- notch; 303- radial through hole; 4- rotor; 5- radial sealing teeth; 6- axial sealing teeth; 7- sealing chamber; 8- first fluid channel; 9- second fluid channel; 10- impeller sealing teeth. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions 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 in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] See also Figures 1 to 6 As shown, the embodiment of the utility model provides a magnetic suspension high-speed centrifuge impeller sealing structure, including an annular seal 1 and an impeller sealing tooth 10. Among them:
[0028] like Figure 1 As shown, the annular seal 1 is installed between the impeller 2 and the front cover 3 of the motor, and is sleeved on the rotor 4. Figure 2 and 4 As shown, continuous radial sealing teeth 5 are formed on the side of the annular seal 1 facing the impeller 2 along the circumferential direction, and continuous axial sealing teeth 6 are formed on the inner ring wall of the annular seal 1 .
[0029] like Figure 1 and Figure 3As shown, the impeller seal teeth 10 are arranged on the side of the impeller 2 facing the annular seal 1, and the impeller seal teeth 10 are meshed with the radial seal teeth 5. Under the action of the radial seal teeth 5, the impeller seal teeth 10 and the axial seal teeth 6, a sealing cavity 7 is formed between the annular seal 1 and the rotor 4 and the impeller 7, and a first fluid channel 8 connecting the sealing cavity is provided on the annular seal 1, and a second fluid channel 9 connecting the first fluid channel 8 to the outside of the centrifuge is provided on the front end cover 3 of the motor.
[0030] After the fluid flows through the impeller 2, it becomes a high-temperature and high-pressure fluid and flows into the sealing chamber 7 on the back of the impeller 2. The radial sealing teeth 5 of the annular seal 1 mesh with the impeller sealing teeth 10 to form a cut-off structure, so as to increase the resistance of the fluid in the sealing chamber 7 to flow into the motor cavity and reduce the inflow. After the fluid flows through the radial sealing structure formed by the radial sealing teeth 5 and the impeller sealing teeth 10 and is cut off, the leakage rate is further reduced, and the leakage amount is also significantly reduced. Then most of the fluid in the sealing chamber 7 flows through the first fluid channel 8 and the second fluid channel 9 and flows out of the centrifuge. The residual gas in the sealing chamber 7 continues to flow to the axial sealing teeth 6, and the axial sealing teeth 6 continue to play a sealing role. The axial sealing teeth 6 can not only effectively reduce the flow rate of the hot fluid flowing from the impeller 2 into the motor cavity, but also isolate the fluid in the motor from entering the impeller 2.
[0031] As a preferred implementation, Figure 3 and Figure 4 As shown, the radial sealing teeth 5 and the impeller sealing teeth 10 are both helical tooth structures, and preferably, the helical tooth structures are sprayed with wear-resistant materials. Through simulation calculation and measurement, the use of helical teeth can minimize the amount of fluid entering.
[0032] As a preferred embodiment, the radial sealing teeth 5 are arranged to be inclined inwards, and the corresponding impeller sealing teeth 10 are arranged to be inclined outwards, so as to achieve meshing of the two.
[0033] As a preferred implementation, Figure 5 As shown, the axial sealing teeth 6 are straight tooth structures.
[0034] As a preferred implementation, Figure 2 As shown, the first fluid channel 8 is a through hole, and the through hole axially penetrates the panel of the annular seal 1.
[0035] As a preferred embodiment, there are multiple perforations, and the multiple perforations are distributed at intervals along the circumferential direction.
[0036] As a preferred implementation, Figure 6As shown, the front cover 3 of the motor is formed with a groove 301 for accommodating an annular seal, and the second fluid channel 9 includes a notch 302 arranged at the bottom of the groove 301 corresponding to the through hole 8, and a radial through hole 303 connecting the notch 302 to the outside of the centrifuge. The fluid in the sealing chamber 7 flows out of the centrifuge through the through hole 8, the notch 302 and the radial through hole 303, thereby reducing the axial force generated by the airflow, so that the axial force of the high-power single-cantilever unit can be reduced.
[0037] As a preferred implementation, there are multiple slots 302 , and the multiple slots 302 are distributed at intervals along the circumferential direction.
[0038] As a preferred embodiment, the number of radial sealing teeth 5 and impeller sealing teeth 10 is multiple, multiple radial sealing teeth 5 are coaxially arranged, multiple impeller sealing teeth 10 are coaxially arranged, and the number of impeller sealing teeth 10 is not less than the number of radial sealing teeth 5. In this embodiment, the number of radial sealing teeth 5 is 5, and the number of impeller sealing teeth 10 is 7. After calculation and measurement, the number of designed sealing teeth can ensure the normal operation of the equipment, slow down the leakage speed, and reduce the leakage amount to the greatest extent.
[0039] As a preferred embodiment, there are multiple axial sealing teeth 6, and the multiple axial sealing teeth 6 are arranged in parallel. In this embodiment, the number of axial sealing teeth 6 is 3. Since the energy and pressure of the residual gas in the sealing chamber 7 have been significantly reduced, the number of sealing teeth can be appropriately reduced.
[0040] Preferably, a radial gap is formed between the radial sealing teeth 5 and the impeller sealing teeth 10, and the radial gap is 0.8mm-1.2mm, which can ensure the cooperation between the two to the greatest extent, ensure that there is no collision under accident conditions and normal conditions, and ensure installation and reduce leakage. The radial gap is as small as possible under the premise of ensuring no friction.
[0041] Preferably, an axial gap is formed between the axial sealing teeth 6 and the rotor 4, and the axial gap is 0.6-0.8 mm.
[0042] During normal operation, the radial clearance and the axial clearance are both smaller than the clearance protecting the bearing, so as to ensure that the magnetic bearing will not collide with the seal and cause seal damage in normal and accident conditions.
[0043] In the impeller sealing structure of the magnetic levitation high-speed centrifuge of the utility model, the fluid becomes high temperature and high pressure after flowing through the impeller 2, and flows into the sealing chamber 7 on the back of the impeller 2. The radial sealing teeth 5 of the annular seal 1 mesh with the impeller sealing teeth 10 to form a cut-off structure to block it, preventing the fluid from flowing into the motor cavity. At the same time, most of the fluid in the sealing chamber 7 flows through the perforation 8, the notch 302 and the radial through hole 303 in sequence to flow out of the centrifuge, while the residual gas in the sealing chamber 7 continues to flow to the axial sealing teeth 6, and the axial sealing teeth 6 continue to play a sealing role, thereby preventing the residual gas from flowing into the motor cavity.
[0044] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.
Claims
1. A magnetic suspension high-speed centrifuge impeller sealing structure, characterized in that: include: An annular seal is installed between the impeller and the front end cover of the motor and sleeved on the rotor. The side of the annular seal facing the impeller is formed with continuous radial sealing teeth along the circumferential direction, and the inner ring wall of the annular seal is formed with continuous axial sealing teeth; Impeller sealing teeth are arranged on the side of the impeller facing the annular seal, the impeller sealing teeth are meshed with the radial sealing teeth, a sealing cavity is formed between the annular seal, the rotor and the impeller, a first fluid channel connected to the sealing cavity is provided on the annular seal, and a second fluid channel connected to the first fluid channel to the outside of the centrifuge is provided on the front end cover of the motor.
2. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 1, characterized in that: The radial sealing teeth and the impeller sealing teeth are both helical tooth structures.
3. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 2, characterized in that: The radial sealing teeth are arranged to be inclined inwards.
4. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 1, characterized in that: The axial sealing teeth are of straight tooth structure.
5. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 1, characterized in that: The first fluid channel is a through hole, and the through hole axially penetrates the annular sealing panel.
6. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 5, characterized in that: The number of the perforations is multiple, and the multiple perforations are distributed at intervals along the circumferential direction.
7. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 5, characterized in that: The motor front end cover is formed with a groove for accommodating the annular seal, and the second fluid channel includes a notch arranged on the bottom of the groove corresponding to the through hole, and a radial through hole connecting the notch to the outside of the centrifuge.
8. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 7, characterized in that: There are multiple slots, and the multiple slots are distributed at intervals along the circumferential direction.
9. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 1, characterized in that: The number of the radial sealing teeth and the impeller sealing teeth is multiple, the multiple radial sealing teeth are coaxially arranged, the multiple impeller sealing teeth are coaxially arranged, and the number of the impeller sealing teeth is not less than the number of the radial sealing teeth.
10. The impeller sealing structure of a magnetically suspended high-speed centrifuge according to claim 1, characterized in that: The number of the axial sealing teeth is multiple, and the multiple axial sealing teeth are arranged in parallel.