CN209838754U - Compressor with gas bearing - Google Patents
Compressor with gas bearing Download PDFInfo
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- CN209838754U CN209838754U CN201822144555.XU CN201822144555U CN209838754U CN 209838754 U CN209838754 U CN 209838754U CN 201822144555 U CN201822144555 U CN 201822144555U CN 209838754 U CN209838754 U CN 209838754U
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Abstract
The utility model discloses a compressor with gas bearing, include: a box body; and a motor rotor rotatably mounted to the case through an electromagnetic bearing and a gas bearing. The embodiment of the utility model provides a through regarding gas bearing as protection bearing, under the unusual operating condition of electromagnetic bearing, continue to carry out good support to the rotor, prevent the inside electromagnetic bearing of rotor and centrifuge and other spare part direct contact to reduce the damage of accurate electrical components such as sensor or electromagnetic bearing.
Description
Technical Field
The utility model relates to the field of refrigeration machinery, especially, relate to a compressor with gas bearing.
Background
Compressors are used to raise low pressure gas to high pressure gas, and are widely used in various processes to deliver air, various process gases or mixed gases and to raise their pressure. Specifically, the compressor sucks a low-temperature and low-pressure refrigerant from the intake pipe, compresses the refrigerant by driving the driven member with the motor, and discharges a high-temperature and high-pressure refrigerant gas to the exhaust pipe. The centrifugal compressor is a compressor with airflow flowing along radial direction, and can be designed into a multi-stage compression structure to improve the processing capacity of the compressor to the refrigerant, improve the compression efficiency and enable the refrigerant to obtain higher pressure.
The centrifugal compressor drives the impeller to work through the rotor (i.e. the rotating shaft) rotating at a high speed, so that the support of the rotor is directly related to the efficiency and the energy consumption of the centrifugal compressor. The electromagnetic bearing has the advantages of no friction loss, low energy consumption, no need of oil lubrication, low noise and the like, and has great application prospect in occasions where refrigerant and lubricating liquid are required to be prevented from being mixed and the electromagnetic bearing operates with ultralow noise.
However, in the centrifugal compressor using the electromagnetic bearing as the rotor supporting member, the suspension function of the electromagnetic bearing may be problematic in abnormal operating conditions such as sudden power failure and overload of the motor, so that the rotor is no longer suspended normally. At this time, precision electrical components such as sensors and bearings inside the centrifuge are likely to come into contact with the high-speed rotor, causing damage to these components and damage to the rotor surface.
In order to prevent the damage or breakage, technicians often use a rolling bearing as a protective bearing to support the rotor. However, the rolling bearing needs to be sufficiently lubricated for good operation, and in the case of an oil-free compressor such as a centrifugal compressor, there is very large friction between the rolling bearing and a rotor, which may damage the surface of the rotor, affect the strength of the rotor, and may cause backfire or adhesive failure of the rolling body of the rolling bearing, which may affect the service life of the centrifuge and the protection of the bearing.
In addition, because the bearing capacity of the rolling bearing has a certain limit at high temperature and high speed, the impact load of the rotor on the rolling bearing is large when the rotor rotates at high speed, and the rolling bearing can be damaged possibly, so that the rolling bearing cannot play a good role in protecting the bearing when the electromagnetic bearing works abnormally.
SUMMERY OF THE UTILITY MODEL
At least one object of the utility model is to provide a compressor, can continue to carry out good support to the rotor under the electromagnetic bearing abnormal operating condition, prevent the inside electromagnetic bearing of rotor and centrifuge and other spare parts direct contact to reduce the damage of accurate electrical components such as sensor or electromagnetic bearing. The utility model provides a plurality of technical effects that preferred technical scheme among a great deal of technical scheme can produce see the explanation below in detail.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a pair of compressor, a serial communication port, include: a box body; and a motor rotor rotatably mounted to the case through an electromagnetic bearing and a gas bearing.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the first-stage impeller is arranged at the first end of the motor rotor through an impeller locking nut; the secondary impeller is arranged at the first end of the motor rotor and is arranged on one side, away from incoming flow, of the primary impeller, and the secondary impeller has an incoming flow direction consistent with that of the primary impeller; and the motor stator is arranged in the box body, sleeved outside the motor rotor and positioned in the direction in which the secondary impeller is far away from incoming flow.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention is optimized, the gas bearing includes: the first gas bearing is arranged between the primary impeller and the secondary impeller along the axial direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor close to the incoming flow direction; and the second gas bearing is arranged on one side of the motor rotor, which is far away from the incoming flow direction, along the axis direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor, which is far away from the incoming flow direction.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention, the first gas bearing and/or the second gas bearing and the motor rotor are in clearance fit.
As the utility model discloses in the foregoing or any technical scheme that provides hereafter or any optimization after technical scheme's optimization, first gas bearing and/or the second gas bearing is dynamic pressure gas bearing, can be in under the electric motor rotor rotating condition, absorb the gaseous working medium of compressor to produce the suspension power, to electric motor rotor supports.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention is optimized, the hydrodynamic gas bearing includes: the foil is used as a bearing bush of the dynamic pressure gas bearing, and a wear-resistant coating is coated on one side matched with the motor rotor; wherein the wear-resistant coating is capable of providing a protective effect to the hydrodynamic gas bearing and the rotor when the hydrodynamic gas bearing cannot generate sufficient suspension force.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the first electromagnetic bearing is arranged between the secondary impeller and the motor stator along the axial direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor close to the incoming flow direction; the first bearing end cover is fixedly arranged in the box body and used for positioning and supporting the first electromagnetic bearing along the axial direction and the radial direction of the motor rotor; the second-stage diffuser is connected with the box body through interference fit and abutted to one side, close to the incoming flow direction, of the first bearing end cover; the backflow device is connected with the box body through interference fit and fixedly connected to one side, close to the incoming flow direction, of the second-stage diffuser; and an airflow channel is formed between the secondary diffuser and the reflux device and is used for guiding the gas medium flowing out of the secondary impeller.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the first-stage diffuser is sleeved outside the first gas bearing and is fixedly connected to one side, close to the incoming flow direction, of the reflux device along the axial direction of the motor rotor; the first-stage impeller diffuser is connected with the box body through interference fit and abutted to one side of the reflux device close to the incoming flow direction; the first-stage diffuser forms an airflow channel with the first-stage impeller diffuser and the reflux device respectively and is used for guiding a gas medium flowing out of the first-stage impeller to enter an air inlet channel of the second-stage impeller.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the air inlet cover is hermetically arranged on one side of the box body close to the incoming flow direction and is provided with an air inlet channel used for introducing a gas working medium into the air inlet channel of the primary impeller; and the primary sealing structure is arranged between the air inlet cover and the primary impeller diffuser, and is abutted to the periphery of the primary impeller through first comb teeth arranged on the primary sealing structure so as to prevent the gas medium from leaking from the direction of the primary impeller far away from the incoming flow to the direction of the incoming flow along the axial direction of the motor rotor.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention, the one-level sealing structure is close to one side of the motor rotor axis and forms a continuous curved surface between the surfaces of the air inlet channel.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the oil blocking sleeve is connected with the motor rotor through interference fit, and is respectively attached to one side, away from the incoming flow direction, of the secondary impeller through a first gasket and attached to a shaft shoulder of the motor rotor through a second gasket; the secondary sealing structure is fixedly connected to one side of the reflux device, which is close to the motor rotor, and is in interference fit with the oil blocking sleeve to realize the positioning of the secondary sealing structure along the radial direction of the motor rotor; and the surface of the secondary sealing structure in interference fit with the oil blocking sleeve is provided with second comb teeth for preventing gas medium from leaking from the direction of the secondary impeller close to incoming flow to the direction far away from the incoming flow along the axial direction of the motor rotor.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the supporting sleeve is clamped on one side, close to the motor rotor, of the first-stage diffuser through a locking nut and is sleeved outside the first gas bearing in an interference fit mode; the first bearing end cover is sleeved on the motor rotor, is positioned between the primary impeller and the support sleeve along the axial direction of the motor rotor, and is used for positioning one side of the first gas bearing close to the incoming flow direction along the axial direction of the motor rotor; and the interstage seal is sleeved on the motor rotor, is positioned on one side of the secondary impeller close to the incoming flow direction along the axial direction of the motor rotor, and is used for positioning one side of the first gas bearing far away from the incoming flow direction along the axial direction of the motor rotor.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention, a third comb tooth arranged along the axial direction of the motor rotor is provided between the interstage seal and the first-stage diffuser, so as to prevent the gas medium from leaking from the second-stage impeller to the first-stage impeller along the axial direction of the motor rotor.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the second electromagnetic bearing is arranged between the motor assembly and the second end of the motor rotor along the axial direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor away from the incoming flow direction; the second bearing end cover is fixedly arranged on one side, far away from the incoming flow direction, in the box body and used for positioning and supporting the second electromagnetic bearing along the axial direction and the radial direction of the motor rotor; the thrust bearing assembly is arranged at one end of the motor rotor, which is far away from the incoming flow direction, and is fixedly connected to one side, which is far away from the incoming flow direction, of the second bearing end cover; the bearing support is fixedly connected to one side, far away from the incoming flow direction, of the thrust bearing assembly and is used for positioning one side, close to the incoming flow direction, of the second gas bearing along the axial direction of the motor rotor; and the bearing gland is fixedly connected to one side of the bearing support far away from the incoming flow direction and is used for positioning one side of the second gas bearing far away from the incoming flow direction along the axial direction of the motor rotor.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the thrust bearing assembly includes: an electromagnetic thrust bearing; and the sensor is used for monitoring the axial force of the motor rotor and enabling the electromagnetic thrust bearing to generate electromagnetic force balanced with the axial force according to the monitoring result of the axial force of the motor rotor, so that the motor rotor is prevented from moving along the axial direction.
Based on above-mentioned technical scheme, the embodiment of the utility model provides a through regarding gas bearing as protection bearing, under the unusual operating condition of electromagnetic bearing, continue to carry out good support to the rotor, prevent the inside electromagnetic bearing of rotor and centrifuge and other spare part direct contact to reduce the damage of accurate electrical components such as sensor or electromagnetic bearing.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic sectional view of a compressor according to an embodiment of the present invention;
fig. 2 is a schematic partial sectional view of a first-stage gas bearing of a compressor according to an embodiment of the present invention;
reference numerals: 1. the gas turbine comprises a box body, 2, a motor rotor, 3, a first-stage impeller, 4, a second-stage impeller, 5, a motor stator, 6, a first gas bearing, 7, a second gas bearing, 8, a first electromagnetic bearing, 9, a first bearing end cover, 10, a second-stage diffuser, 11, a reflux device, 12, a first-stage diffuser, 13, a first-stage impeller diffuser, 14, an air inlet cover, 15, a first-stage sealing structure, 16, an oil blocking sleeve, 17, a second-stage sealing structure, 18, a supporting sleeve, 19, a first bearing end cover, 20, an inter-stage seal, 21, a second electromagnetic bearing, 22, a second bearing end cover, 23, a thrust bearing assembly, 24, a bearing support, 25 and a bearing gland.
Detailed Description
The contents of the present invention and the differences between the present invention and the prior art can be understood with reference to the drawings and the text. The invention will be described in further detail below (including the preferred embodiments) with reference to the drawings and illustrative examples of some alternative embodiments of the invention.
It should be noted that: any technical features and any technical solutions in this embodiment are one or more of various optional technical features or optional technical solutions, and for the sake of brevity, this document cannot exhaust all the alternative technical features and alternative technical solutions of the present invention, and it is not convenient for each embodiment of the technical features to emphasize that it is one of various optional embodiments, so those skilled in the art should know that: can replace any technical means or combine two or more technical means or technical characteristics of the utility model provides an arbitrary or more technical means or technical characteristics mutually and obtain new technical scheme.
Any technical features and any technical solutions in the present embodiment do not limit the scope of the present invention, and the scope of the present invention should include any alternative technical solutions that can be conceived by those skilled in the art without creative efforts and new technical solutions that can be obtained by combining any two or more technical means or technical features provided by the present invention with each other by those skilled in the art.
The technical scheme provided by the utility model is explained in more detail below with reference to the accompanying drawings 1-2.
As shown in fig. 1, the present invention provides a compressor, including: a box body 1; and a motor rotor 2 rotatably mounted to the case 1 through an electromagnetic bearing and a gas bearing.
Motor rotor 2 supports through the bearing of two sets of different theory of operation, has guaranteed that motor rotor 2 still can receive good protection when one of them bearing can't normally work. For example, when the gas bearing cannot stably supply gas or the rotation speed of the motor rotor 2 is not enough to make the gas bearing generate enough supporting force, the electromagnetic bearing can suspend the motor rotor 2 by its own magnetic force and support it well. On the contrary, when the electromagnetic bearing cannot work normally, the gas bearing can be driven by the motor rotor 2 which rotates continuously to support the electromagnetic bearing.
In addition, the electromagnetic bearing and the gas bearing are non-contact supporting structures and are not in direct contact with the motor rotor 2, so that lubricating liquid is not needed for lubricating the electromagnetic bearing and the gas bearing. On the basis, the structure of the compressor can be further simplified, namely, an oil lubricating system is omitted, and the effective supporting and protecting effects on the motor rotor 2 in the compressor are achieved.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the primary impeller 3 is arranged at the first end of the motor rotor 2 through an impeller locking nut; the secondary impeller 4 is arranged at the first end of the motor rotor 2 and is arranged on one side, away from the incoming flow, of the primary impeller 3, and the secondary impeller 4 has the same incoming flow direction with the primary impeller 3; and the motor stator 5 is arranged in the box body 1, sleeved outside the motor rotor 2 and positioned in the direction in which the secondary impeller 4 is far away from incoming flow.
The primary impeller 3 and the secondary impeller 4 are installed at the same end of the motor rotor 2, and compared with a scheme installed at different ends of the motor rotor 2, the gas medium flowing out of the primary impeller 3 can be left at the inlet of the secondary impeller 4 in a shorter path, and the flow loss (including pressure loss and speed loss) of the gas medium in the interstage transmission process is effectively reduced.
In addition, the first-stage impeller 3 and the second-stage impeller 4 mounted on the same end can further simplify the sealing structure on the basis of simplifying the interstage gas path. Specifically, when the first-stage impeller 3 and the second-stage impeller 4 are installed at two ends of the motor rotor 2, the first-stage impeller 3 and the second-stage impeller 4 need to be sealed in the axial direction and the radial direction respectively, taking axial sealing as an example, each impeller at least needs to be provided with a sealing structure in the axial air inlet direction and the axial air outlet direction respectively, and other parts where air leakage may occur are additionally sealed in a key manner, so that the complexity of the compressor structure is greatly improved. The first-stage impeller 3 and the second-stage impeller 4 arranged on the same side have a simple seal in the axial direction, and the specific structure is described below.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention is optimized, the gas bearing includes: the first gas bearing 6 is arranged between the primary impeller 3 and the secondary impeller 4 along the axial direction of the motor rotor 2 and is used for bearing the radial force of one end of the motor rotor 2 close to the incoming flow direction; and the second gas bearing 7 is arranged on one side of the motor rotor 21 far away from the incoming flow direction along the axis direction of the motor rotor 2 and is used for bearing the radial force of one end of the motor rotor 2 far away from the incoming flow direction.
The first gas bearing 6 and the second gas bearing 7 are respectively supported at two ends of the motor rotor 2, so that effective support can be provided for the motor rotor 2, and meanwhile, the deflection of the motor rotor 2 is ensured to meet the requirement, and the deflection or the bending to a larger degree is avoided.
And the first gas bearing 6 and the second gas bearing 7 are only used for bearing the radial force of the motor rotor 2, and are prevented from bearing excessive axial load and failing. Especially right the embodiment of the utility model provides an in will one-level impeller 3 and second grade impeller 4 install in same one end of electric motor rotor 2 to have the same direction of admitting air, the produced axial force of two-stage impeller can't offset each other, along with electric motor rotor 2's rotational speed improves, follows electric motor rotor 2 axial load will promote rapidly, makes gas bearing no longer can be right electric motor rotor 2 effectively supports.
As an optimization of any technical solution or any optimized technical solution provided in the foregoing or following of the present invention, the first gas bearing 6 and/or the second gas bearing 7 and the motor rotor 2 are in clearance fit.
Due to the clearance fit between the first gas bearing 6 and/or the second gas bearing 7 and the motor rotor 2, when the electromagnetic bearing and the motor rotor 2 are in over-fit or interference fit, the first gas bearing 6 and/or the second gas bearing 7 will not bear the radial load from the motor rotor 2 under the normal working state of the electromagnetic bearing.
When the electromagnetic bearing is in clearance fit with the motor rotor 2, the clearance between the first gas bearing 6 and/or the second gas bearing 7 and the motor rotor 2 can be controlled to be smaller than the clearance between the electromagnetic bearing and the motor rotor 2, so that the first gas bearing 6 and/or the second gas bearing 7 continuously bears no radial load from the motor rotor 2 or bears less radial load from the motor rotor 2 under the normal working state of the electromagnetic bearing. Accordingly, the electromagnetic force of the electromagnetic bearing can be controlled to achieve the effect similar to the effect of controlling the gap, and the details are not repeated herein.
As the utility model discloses in the foregoing or any technical scheme that provides hereafter or any optimization after the technical scheme's optimization, first gas bearing 6 and/or second gas bearing 7 are dynamic pressure gas bearing, can be in under the electric motor rotor 2 rotating condition, absorb the gaseous working medium of compressor to produce the suspension, to electric motor rotor 2 supports.
When the first gas bearing 6 and/or the second gas bearing 7 adopt dynamic pressure gas bearings, the gas medium in the compressor can be absorbed through the driving of the motor rotor 2, the suspension force is generated, and an additional structure of external gas supply is omitted. Of course, the first gas bearing 6 and/or the second gas bearing 7 may also be static pressure gas bearings, and intake channels corresponding to the first gas bearing 6 or the second gas bearing 7 are designed inside the compressor, respectively, and the first gas bearing 6 and/or the second gas bearing 7 can bear the motor rotor 2 by applying pressurized gas.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention is optimized, the hydrodynamic gas bearing includes: the foil is used as a bearing bush of the dynamic pressure gas bearing, and a wear-resistant coating is coated on one side matched with the motor rotor 2; wherein the wear-resistant coating is capable of providing a protective effect to the hydrodynamic gas bearing and the rotor when the hydrodynamic gas bearing cannot generate sufficient suspension force.
The foil is fixed by a pressure plate and a locking device after being tensioned, and wraps the motor rotor 2, which is equivalent to a bearing bush. When the motor rotor 2 rotates, the gas medium is used as a lubricant, enters the foil along with the rotation due to the viscous action, and forms a dynamic pressure lubricating film, so that the foil is deformed and is separated from the shaft, and the motor rotor 2 is supported and protected.
As described above, the operation of the foil in the dynamic pressure gas bearing depends on the rotation of the motor rotor 2, and the viscosity of the lubricant. Therefore, at low rotational speeds of the motor rotor, or when the lubricant is not sufficiently viscous (for example, when a gaseous medium is used as the lubricant, the viscosity of the gas decreases with increasing temperature), the foil will come into contact with the motor rotor 2, and the wear-resistant coating can function to protect the rotor surface of the hydrodynamic gas bearing.
Accordingly, when the first gas bearing 6 and/or the second gas bearing 7 are static pressure gas bearings, since the gas medium serving as the lubricant is supplied from the outside, the first gas bearing 6 and/or the second gas bearing 7 can continue to generate a sufficient levitation force and provide a protective effect to the motor rotor when the motor rotor 2 rotates at a relatively slow speed or the motor rotor has a relatively high temperature.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the first electromagnetic bearing 8 is arranged between the secondary impeller 4 and the motor stator 5 along the axial direction of the motor rotor 2 and is used for bearing the radial force of one end, close to the incoming flow direction, of the motor rotor 2; the first bearing end cover 9 is fixedly arranged inside the box body 1 and is used for positioning and supporting the first electromagnetic bearing 8 along the axial direction and the radial direction of the motor rotor 2; the second-stage diffuser 10 is connected with the box body 1 through interference fit and abutted to one side, close to the incoming flow direction, of the first bearing end cover 9; the reflux device 11 is connected with the box body 1 through interference fit and fixedly connected to one side, close to the incoming flow direction, of the secondary diffuser 10; an airflow channel is formed between the second-stage diffuser 10 and the return device 11, and is used for guiding the gas medium flowing out of the second-stage impeller 4.
It is right in the in-process that parts such as first electromagnetic bearing 8, first bearing end cover 9, second grade diffuser 10 and return-flow vessel 11 carried out the location installation, the embodiment of the utility model provides an it is at first right through the box first bearing end cover 9 is fixed a position to use this as the basis, form location and the relation of connection to other parts.
The fixed connection or the positioning between the components can be realized in multiple modes such as abutting against, clamping, bolt, bonding or matching, the fixed connection mode is flexibly selected according to the structures of the components, and the structure of the box body and the structures of the components can be designed in a targeted manner. Other positioning and connecting modes mentioned in the embodiments of the present invention can also be designed according to similar principles, and are not described in detail herein.
The airflow passage formed between the two-stage diffuser 10 and the return device 11 may have a certain flow area variation according to its function. For example, for the compressor of the embodiment of the present invention, the expanding flow passage (i.e., the flow area gradually increases along the flow direction of the medium) can perform the functions of speed reduction and pressure increase. It should be noted that the two-dimensional plane area of the air flow channel shown in fig. 1 decreases with the direction of flow, but for a three-dimensional compressor the cross-sectional area of the flow channel is also related to the radius from the motor rotor 2, so in practice the flow channel may be a typical diverging flow channel.
Of course, the excessive pressure may bring about a large flow loss, and the air flow passage may be configured as a non-expanding flow passage (including a constricted flow passage or a straight flow passage); correspondingly, for the compressor with the downstream components, the flow area of the flow channel can be designed in a pertinence manner so as to adapt to the requirements of different downstream components on air inlet parameters; also, similar converging-diverging passages may be used to increase pressure when the compressor is supersonic or critical, or other desired flow path designs. Other airflow channels in the embodiment of the present invention also have similar characteristics, and are not described in detail later.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the first-stage diffuser 12 is sleeved outside the first gas bearing 6 and is fixedly connected to one side, close to the incoming flow direction, of the reflux device 11 along the axial direction of the motor rotor 2; the first-stage impeller diffuser 13 is connected with the box body 1 through interference fit and abutted to one side, close to the incoming flow direction, of the reflux device 11; the first-stage diffuser 12, the first-stage impeller diffuser 13 and the return device 11 form an air flow passage respectively, and the air flow passage is used for guiding a gas medium flowing out of the first-stage impeller 3 to enter an air inlet passage of the second-stage impeller 4.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the air inlet cover 14 is hermetically arranged on one side of the box body 1 close to the incoming flow direction, and the air inlet cover 14 is provided with an air inlet channel used for introducing a gas working medium into the air inlet channel of the primary impeller 3; and a primary sealing structure 15 disposed between the intake shroud 14 and the primary impeller diffuser 13, and abutting against the periphery of the primary impeller 3 through first comb teeth disposed thereon, so as to prevent the gas medium from leaking from a direction away from the incoming flow to a direction close to the incoming flow of the primary impeller 3 along the axial direction of the motor rotor 2.
Since the gas medium entering the primary impeller 3 will be worked to have a large pressure in the working state of the primary impeller 3, it is necessary to seal the primary impeller 3 axially from the inside to the outside. Moreover, for the rotating part, the comb tooth seal is a seal form that the seal part is not in direct friction contact with the structural part, and has good seal effect and adaptability; of course, for those skilled in the art, the first comb teeth may be replaced by other structures or components capable of producing a good sealing effect, and only the first-stage impeller 3 needs to be sealed well along the axial direction.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention, the one-level sealing structure 15 forms a continuous curved surface between one side close to the axis of the motor rotor 2 and the surface of the air inlet passage.
Since the air inlet channel on the air inlet cover 14 is used for guiding the gas medium outside the compressor to enter the primary impeller 3 in the compressor, the air inlet channel on the air inlet cover is correspondingly designed as a contracted smooth flow channel so as to effectively enlarge the air collection range, correct the direction of the air inlet speed and reduce the air inlet distortion. On the basis, a continuous curved surface is formed between one side of the primary sealing structure 15 close to the axis of the motor rotor 2 and the surface of the air inlet channel, so that the smooth contraction channel of the air inlet channel can be reasonably extended, the state of air flow entering the primary impeller 3 is not damaged, and good air inlet conditions are continuously obtained.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the oil blocking sleeve 16 is connected with the motor rotor 2 through interference fit, and is respectively attached to one side, away from the incoming flow direction, of the secondary impeller 4 through a first gasket and attached to a shaft shoulder of the motor rotor 2 through a second gasket; the secondary sealing structure 17 is fixedly connected to one side of the reflux device 11 close to the motor rotor 2 and is in interference fit with the oil blocking sleeve 16 to realize the radial positioning of the reflux device along the motor rotor 2; the surface of the secondary sealing structure 17, which is in interference fit with the oil blocking sleeve 16, is provided with second comb teeth for preventing the gas medium from leaking from the direction of the secondary impeller 4 close to the incoming flow to the direction away from the incoming flow along the axial direction of the motor rotor 2.
The oil blocking sleeve 16 and the secondary seal structure 17 are used to effectively seal the secondary impeller 4 in the axial direction. For the secondary impeller 4, the gaseous medium therein has the maximum pressure in the compressor, and therefore the sealing thereof should also have corresponding design considerations.
The embodiment of the utility model provides an in hinder oil cover 16 through interference fit with electric motor rotor 2 connects, and respectively through first gasket laminate in second grade impeller 4 keeps away from one side of incoming flow direction, laminate in through the second gasket electric motor rotor 2's shaft shoulder for hinder oil cover 16 by firmly restricted in electric motor rotor 2 is last to set for the region. Correspondingly, the secondary sealing structure 17 is fixedly connected to one side of the return device 11 close to the motor rotor 2, and is in interference fit with the oil blocking sleeve 16 to realize the radial positioning of the motor rotor 2 and the firm installation of the oil blocking sleeve 16.
And since the oil blocking sleeve 16 will rotate along with the motor rotor 2, the secondary sealing structure 17 will be fixed with the box body 1 through the secondary diffuser 10, and the sealing structure between them is preferably the second comb teeth, so as to achieve good sealing effect between the rotating room and the fixed room.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the supporting sleeve 18 is clamped on one side of the first-stage diffuser 12 close to the motor rotor 2 through a locking nut and is sleeved outside the first gas bearing 6 through interference fit; the first bearing end cover 19 is sleeved on the motor rotor 2, is positioned between the primary impeller 3 and the support sleeve 18 along the axial direction of the motor rotor 2, and is used for positioning one side of the first gas bearing 6 close to the incoming flow direction along the axial direction of the motor rotor 2; and the interstage seal 20 is sleeved on the motor rotor 2, is positioned on one side, close to the incoming flow direction, of the secondary impeller 4 along the axial direction of the motor rotor 2, and is used for positioning one side, far away from the incoming flow direction, of the first gas bearing 6 along the axial direction of the motor rotor 2.
The first gas bearing 6 is positioned axially and radially along the motor rotor 2 through the support sleeve 18, the first bearing end cover 19 and the inter-stage seal 20, so that the first gas bearing only bears the radial load of the motor rotor 2 on the basis of ensuring that the relative position of the first gas bearing is fixed, and the stable working effect and the long service life of the first gas bearing are ensured.
As any technical solution or any optimized technical solution provided in the foregoing or following of the present invention, a third comb tooth arranged along the axial direction of the motor rotor 2 is provided between the inter-stage seal 20 and the first-stage diffuser 12, and is used for preventing the gas medium from leaking from the second-stage impeller 4 to the first-stage impeller 3 along the axial direction of the motor rotor 2.
In the case of the primary impeller 3 and the secondary impeller 4 which are arranged at the same end of the motor rotor 2, the gas medium will take a higher pressure in the secondary impeller 4 than in the case of the primary impeller 3, so that, by means of the inter-stage seal 20 and the third comb teeth thereon, a high-pressure gas medium can be effectively leaked in the axial direction of the motor rotor 2 from the secondary impeller 4 in the direction of the primary impeller 3.
As any technical solution or any post-optimization technical solution provided in the foregoing or following of the present invention is optimized, the compressor includes: the second electromagnetic bearing 21 is installed between the motor stator 5 and the second end of the motor rotor 2 along the axial direction of the motor rotor 2, and is used for bearing the radial force of one end of the motor rotor 2 away from the incoming flow direction; the second bearing end cover 22 is fixedly installed on one side, far away from the incoming flow direction, inside the box body 1 and used for positioning and supporting the second electromagnetic bearing 21 along the axial direction and the radial direction of the motor rotor 2; the thrust bearing assembly 23 is arranged at one end of the motor rotor 2 far away from the incoming flow direction and is fixedly connected to one side of the second bearing end cover 22 far away from the incoming flow direction; the bearing support 24 is fixedly connected to one side, far away from the incoming flow direction, of the thrust bearing assembly 23 and is used for positioning one side, close to the incoming flow direction, of the second gas bearing 7 along the axial direction of the motor rotor 2; and the bearing gland 25 is fixedly connected to one side of the bearing support 24 away from the incoming flow direction and is used for positioning one side of the second gas bearing 7 away from the incoming flow direction along the axial direction of the motor rotor 2.
Correspondingly, the second electromagnetic bearing 21 and the second gas bearing 7 are positioned by using the second bearing end cover 22 fixedly mounted inside the box body 1 as a base, and are respectively positioned by the second bearing end cover 22, the bearing support 24 and the bearing gland 25, so that the second electromagnetic bearing 21 and the second gas bearing 7 are well supported.
As an optimization of any of the technical solutions or any optimized technical solutions provided in the foregoing or following the present invention, the thrust bearing assembly 23 includes: an electromagnetic thrust bearing; and the sensor is used for monitoring the axial force of the motor rotor 2 and enabling the electromagnetic thrust bearing for the axial force of the motor rotor to generate electromagnetic force balanced with the axial force according to the monitoring result so as to prevent the motor rotor 2 from moving along the axial direction.
The electromagnetic thrust bearing effectively separates the axial force of the motor rotor 2, simplifies the support structure of the gas bearing and the electromagnetic bearing, and enables the gas bearing and the electromagnetic bearing to have longer service life.
Based on above-mentioned technical scheme, the embodiment of the utility model provides a through regarding gas bearing as protection bearing, under the unusual operating condition of electromagnetic bearing, continue to carry out good support to the rotor, prevent the inside electromagnetic bearing of rotor and centrifuge and other spare part direct contact to reduce the damage of accurate electrical components such as sensor or electromagnetic bearing.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated. The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
In describing the present invention, if the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are used, the orientation or positional relationship indicated by the above terms is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description and simplicity of description, and does not indicate or imply that the equipment, mechanism, component or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (13)
1. A compressor, comprising:
a box body;
a motor rotor rotatably mounted to the case through an electromagnetic bearing and a gas bearing;
the first-stage impeller is arranged at the first end of the motor rotor through an impeller locking nut;
the secondary impeller is arranged at the first end of the motor rotor and is arranged on one side, away from incoming flow, of the primary impeller, and the secondary impeller has an incoming flow direction consistent with that of the primary impeller; and
the motor stator is arranged in the box body, sleeved outside the motor rotor and positioned in the direction away from the incoming flow of the secondary impeller;
wherein the gas bearing comprises:
the first gas bearing is arranged between the primary impeller and the secondary impeller along the axial direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor close to the incoming flow direction; and
and the second gas bearing is arranged on one side of the motor rotor, which is far away from the incoming flow direction, along the axis direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor, which is far away from the incoming flow direction.
2. The compressor of claim 1, wherein the first and/or second gas bearings are a clearance fit with the motor rotor.
3. The compressor of claim 1, wherein the first gas bearing and/or the second gas bearing is a dynamic pressure gas bearing, and is capable of absorbing a gas working medium of the compressor and generating a levitation force to support the motor rotor in a rotation state of the motor rotor.
4. The compressor of claim 3, wherein the hydrodynamic gas bearing comprises:
the foil is used as a bearing bush of the dynamic pressure gas bearing, and a wear-resistant coating is coated on one side matched with the motor rotor;
wherein the wear-resistant coating is capable of providing a protective effect to the hydrodynamic gas bearing and the rotor when the hydrodynamic gas bearing cannot generate sufficient suspension force.
5. The compressor of claim 1, comprising:
the first electromagnetic bearing is arranged between the secondary impeller and the motor stator along the axial direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor close to the incoming flow direction;
the first bearing end cover is fixedly arranged in the box body and used for positioning and supporting the first electromagnetic bearing along the axial direction and the radial direction of the motor rotor;
the second-stage diffuser is connected with the box body through interference fit and abutted to one side, close to the incoming flow direction, of the first bearing end cover; and
the backflow device is connected with the box body through interference fit and fixedly connected to one side, close to the incoming flow direction, of the second-stage diffuser;
and an airflow channel is formed between the secondary diffuser and the reflux device and is used for guiding the gas medium flowing out of the secondary impeller.
6. The compressor of claim 5, comprising:
the first-stage diffuser is sleeved outside the first gas bearing and is fixedly connected to one side, close to the incoming flow direction, of the reflux device along the axial direction of the motor rotor; and
the first-stage impeller diffuser is connected with the box body through interference fit and abutted to one side of the reflux device close to the incoming flow direction;
the first-stage diffuser forms an airflow channel with the first-stage impeller diffuser and the reflux device respectively and is used for guiding a gas medium flowing out of the first-stage impeller to enter an air inlet channel of the second-stage impeller.
7. The compressor of claim 6, comprising:
the air inlet cover is hermetically arranged on one side of the box body close to the incoming flow direction and is provided with an air inlet channel used for introducing a gas working medium into the air inlet channel of the primary impeller; and
and the primary sealing structure is arranged between the air inlet cover and the primary impeller diffuser, and is abutted to the periphery of the primary impeller through first comb teeth arranged on the primary sealing structure so as to prevent a gas medium from leaking from the direction of the primary impeller far away from the incoming flow to the direction of the incoming flow along the axial direction of the motor rotor.
8. The compressor of claim 7, wherein a side of the primary seal structure adjacent to the motor rotor axis forms a continuous curved surface with the intake passage surface.
9. The compressor of claim 5, comprising:
the oil blocking sleeve is connected with the motor rotor through interference fit, and is respectively attached to one side, away from the incoming flow direction, of the secondary impeller through a first gasket and attached to a shaft shoulder of the motor rotor through a second gasket; and
the secondary sealing structure is fixedly connected to one side, close to the motor rotor, of the reflux device and is in interference fit with the oil blocking sleeve to realize positioning of the secondary sealing structure along the radial direction of the motor rotor;
and the surface of the secondary sealing structure in interference fit with the oil blocking sleeve is provided with second comb teeth for preventing gas medium from leaking from the direction of the secondary impeller close to incoming flow to the direction far away from the incoming flow along the axial direction of the motor rotor.
10. The compressor of claim 6, comprising:
the supporting sleeve is clamped on one side, close to the motor rotor, of the first-stage diffuser through a locking nut and is sleeved outside the first gas bearing in an interference fit mode;
the first bearing end cover is sleeved on the motor rotor, is positioned between the primary impeller and the support sleeve along the axial direction of the motor rotor, and is used for positioning one side of the first gas bearing close to the incoming flow direction along the axial direction of the motor rotor; and
and the interstage seal is sleeved on the motor rotor, is positioned on one side of the secondary impeller close to the incoming flow direction along the axial direction of the motor rotor, and is used for positioning one side of the first gas bearing far away from the incoming flow direction along the axial direction of the motor rotor.
11. The compressor of claim 10, wherein a third comb tooth is disposed between the inter-stage seal and the first-stage diffuser along an axial direction of the motor rotor for preventing a leakage of the gas medium from the second-stage impeller toward the first-stage impeller along the axial direction of the motor rotor.
12. The compressor of claim 1, comprising:
the second electromagnetic bearing is arranged between the motor stator and the second end of the motor rotor along the axial direction of the motor rotor and is used for bearing the radial force of one end of the motor rotor away from the incoming flow direction;
the second bearing end cover is fixedly arranged on one side, far away from the incoming flow direction, in the box body and used for positioning and supporting the second electromagnetic bearing along the axial direction and the radial direction of the motor rotor;
the thrust bearing assembly is arranged at one end of the motor rotor, which is far away from the incoming flow direction, and is fixedly connected to one side, which is far away from the incoming flow direction, of the second bearing end cover;
the bearing support is fixedly connected to one side, far away from the incoming flow direction, of the thrust bearing assembly and is used for positioning one side, close to the incoming flow direction, of the second gas bearing along the axial direction of the motor rotor; and
and the bearing gland is fixedly connected to one side of the bearing support far away from the incoming flow direction and is used for positioning one side of the second gas bearing far away from the incoming flow direction along the axial direction of the motor rotor.
13. The compressor of claim 12, wherein the thrust bearing assembly comprises:
an electromagnetic thrust bearing; and
and the sensor is used for monitoring the axial force of the motor rotor and enabling the electromagnetic thrust bearing to generate electromagnetic force balanced with the axial force according to the monitoring result of the axial force of the motor rotor, so that the motor rotor is prevented from moving along the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822144555.XU CN209838754U (en) | 2018-12-20 | 2018-12-20 | Compressor with gas bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822144555.XU CN209838754U (en) | 2018-12-20 | 2018-12-20 | Compressor with gas bearing |
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| Publication Number | Publication Date |
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| CN209838754U true CN209838754U (en) | 2019-12-24 |
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| CN201822144555.XU Active CN209838754U (en) | 2018-12-20 | 2018-12-20 | Compressor with gas bearing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109372791A (en) * | 2018-12-20 | 2019-02-22 | 珠海格力电器股份有限公司 | A kind of compressor with gas bearing |
| CN111608930A (en) * | 2020-05-20 | 2020-09-01 | 无锡职业技术学院 | Gas bearing and gas bearing type centrifugal compressor |
-
2018
- 2018-12-20 CN CN201822144555.XU patent/CN209838754U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109372791A (en) * | 2018-12-20 | 2019-02-22 | 珠海格力电器股份有限公司 | A kind of compressor with gas bearing |
| CN111608930A (en) * | 2020-05-20 | 2020-09-01 | 无锡职业技术学院 | Gas bearing and gas bearing type centrifugal compressor |
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