CN117489631A

CN117489631A - Compressor and control method thereof

Info

Publication number: CN117489631A
Application number: CN202311717763.3A
Authority: CN
Inventors: 杨佳丰; 王飞; 吴瑞
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-12-13
Filing date: 2023-12-13
Publication date: 2024-02-02

Abstract

The invention provides a compressor and a control method thereof, wherein the compressor comprises a shell and a rotating shaft, the shell is provided with a motor cavity, a compression cavity and a partition piece for separating the motor cavity and the compression cavity, a through hole for the rotating shaft to pass through is formed in the partition piece, and the rotating shaft is used for being driven by a motor component in the motor cavity to drive an impeller in the compression cavity to rotate; the oil-resisting sleeve is sleeved and fixed on the rotating shaft; the compressor is also provided with an axial force adjusting structure, the position of the oil blocking sleeve is adjustable, and when the oil blocking sleeve is positioned at different positions, the first axial force born by the oil blocking sleeve is different under the action of the axial force adjusting structure; the oil-blocking sleeve is provided with at least two positions with different first axial force directions, and the first axial force directions are parallel to the axial direction of the rotating shaft. According to the technical scheme, the bearing pressure of the axial magnetic suspension bearing can be reduced, and the influence of excessive bearing pressure on the stable operation of the compressor due to the fact that the bearing pressure exceeds the bearing capacity range of the axial magnetic suspension bearing is avoided.

Description

Compressor and control method thereof

Technical Field

The invention belongs to the technical field of air compression, and particularly relates to a compressor and a control method thereof.

Background

The impeller pressure ratio of the compressor is generally higher, so that the axial force born by the rotating shaft of the compressor is larger, and the thrust disc is generally arranged on the rotating shaft to balance the axial force of the rotating shaft in cooperation with the axial magnetic suspension bearing. Specifically, the axial magnetic suspension bearing applies a reverse thrust force to the thrust disc to counteract the axial force applied by the impeller to the rotating shaft.

If the axial force applied by the impeller to the rotating shaft is too large during the operation of the compressor, the axial magnetic suspension bearing can also apply larger reverse thrust to the rotating shaft through the thrust disc in order to offset the excessive axial force, and if the larger axial force exceeds the bearing capacity range of the axial magnetic suspension bearing, the stable operation of the compressor can be influenced.

Disclosure of Invention

Therefore, the invention provides a compressor and a control method thereof, which mainly aims to solve the technical problems that: how to reduce the bearing pressure of the axial magnetic suspension bearing, and avoid that the excessive bearing pressure exceeds the bearing capacity range of the axial magnetic suspension bearing to influence the stable operation of the compressor.

In order to solve the problems, the invention provides a compressor, which comprises a shell and a rotating shaft, wherein the shell is provided with a motor cavity, a compression cavity and a separating piece for separating the motor cavity and the compression cavity, a through hole for the rotating shaft to pass through is formed in the separating piece, and the rotating shaft is used for being driven by a motor component in the motor cavity to drive an impeller in the compression cavity to rotate; the oil blocking sleeve is sleeved and fixed on the rotating shaft and can prevent the compression cavity and the motor cavity from passing through the Kong Cuanqi;

the compressor is also provided with an axial force adjusting structure, the position of the oil blocking sleeve is adjustable, and when the oil blocking sleeve is positioned at different positions, the first axial force born by the oil blocking sleeve is different under the action of the axial force adjusting structure; the oil blocking sleeve is provided with at least two positions with different first axial force directions, and the first axial force directions are parallel to the axial direction of the rotating shaft.

In some embodiments, the axial force adjustment structure includes a shielding structure that remains relatively fixed with the housing, the oil-resistant sleeve having a first side on the compression chamber side and a second side on the motor chamber side, the first side having a gap with the impeller; the oil resistance sleeve can be adjusted to a first position and a second position with different first axial force directions;

wherein, when the oil blocking sleeve is positioned at the first position, only at least one part of the first side surface of the oil blocking sleeve and the second side surface of the oil blocking sleeve is blocked by the blocking structure, so that the pressure at the blocked position on the first side surface is lower than the pressure in the gap; and when in the second position, at least a portion of only the second side of the first and second sides is blocked by the blocking structure, such that the pressure at the blocked position on the second side is lower than the pressure in the motor cavity.

In some embodiments, the shielding structure comprises a groove arranged on the wall of the through hole, and the outer edge of the oil blocking sleeve extends into the groove; the groove has a first groove wall opposite the first side and a second groove wall opposite the second side; wherein,

when the oil blocking sleeve is positioned at the first position, the shielding structure shields at least one part of the first side surface through the first groove wall, and a first gap communicated with the motor cavity is formed between the second groove wall and the second side surface; and/or when the oil blocking sleeve is positioned at the second position, the shielding structure shields at least a part of the second side surface through the second groove wall, and a second gap communicated with the gap is formed between the first groove wall and the first side surface.

In some embodiments, when the oil-blocking sleeve is located at the first position, the first groove wall shields at least a portion of the first side surface by the first comb tooth structure; and/or when the oil blocking sleeve is positioned at the second position, the second groove wall shields at least part of the second side surface through the second comb tooth structure.

In some embodiments, the groove is an annular groove having a bottom surface between the first groove wall and the second groove wall, the bottom surface being in sealing engagement with an outer edge end of the oil-resistant sleeve to achieve sealing engagement of the oil-resistant sleeve with the via.

In some embodiments, the compressor further comprises a position adjustment mechanism; the position adjusting mechanism is used for pushing the oil blocking sleeve to move to different positions so as to adjust the position of the oil blocking sleeve.

In some embodiments, the position adjustment mechanism comprises a first axial magnetic suspension bearing assembly and a thrust disc, wherein the thrust disc is sleeved on the rotating shaft and is positioned between two axial magnetic suspension bearings of the first axial magnetic suspension bearing assembly;

the position adjusting mechanism applies force to the thrust disc through the first axial magnetic suspension bearing assembly, so that the thrust disc drives the oil blocking sleeve to move to different positions through the rotating shaft.

In some embodiments, the compressor further comprises a detection mechanism and a control mechanism; the detection mechanism is used for detecting the second axial force exerted by the impeller on the rotating shaft;

and the control mechanism is used for controlling the position adjusting mechanism to push the oil resistance sleeve to move to the corresponding position when the second axial force faces to the first direction, so that the direction of the first axial force applied to the oil resistance sleeve is opposite to the first direction.

In some embodiments, when the oil-blocking sleeve is adjustable to a first position and a second position, if the first direction is the direction from the motor cavity to the compression cavity, the control mechanism controls the position adjustment mechanism to push the oil-blocking sleeve to move to the second position; and if the first direction is from the compression cavity to the motor cavity, the control mechanism controls the position adjusting mechanism to push the oil blocking sleeve to move to the first position.

In some embodiments, the compressor further has a second axial magnetic bearing assembly for applying a third axial force to the shaft, the third axial force being within a load pressure range of the second axial magnetic bearing assembly, a resultant of the first and third axial forces being a fourth axial force, the impeller applying a fifth axial force to the shaft, the fourth axial force being opposite in direction to the fifth axial force.

In some embodiments, the compressor has a primary impeller with an axle, the side of the axle facing away from the motor cavity being provided with a clamping surface for clamping by a wrench.

The invention also provides a control method of the compressor, which comprises the following steps:

detecting a second axial force applied by the impeller to the rotating shaft;

when the second axial force faces to the first direction, the position adjusting mechanism is controlled to push the oil blocking sleeve to move to the corresponding position, so that the direction of the first axial force applied to the oil blocking sleeve is opposite to the first direction.

In some embodiments, when the oil-blocking sleeve is adjustable to a first position and a second position, if the first direction is the direction from the motor cavity to the compression cavity, the position adjusting mechanism is controlled to push the oil-blocking sleeve to move to the second position; and if the first direction is from the compression cavity to the motor cavity, controlling the position adjusting mechanism to push the oil blocking sleeve to move to the first position.

The compressor and the control method thereof provided by the invention have the following beneficial effects:

1. because the oil blocking sleeve is fixedly sleeved on the rotating shaft, the axial forces born by the oil blocking sleeve at different positions can be fed back to the rotating shaft, when the axial force applied by the air pressure in the compression cavity to the rotating shaft is overlarge, the position of the oil blocking sleeve can be adjusted, so that the direction of the first axial force born by the oil blocking sleeve is opposite to the axial force applied by the air pressure in the compression cavity to the rotating shaft, the axial force applied by the air pressure in the compression cavity to the rotating shaft is weakened, the bearing pressure of the axial magnetic suspension bearing can be reduced, and the influence on the stable operation of the compressor due to the fact that the bearing pressure of the axial magnetic suspension bearing exceeds the bearing capacity range is avoided.

2. The detection mechanism, the control mechanism and the position adjusting mechanism are matched, so that the automatic adjustment of the position of the oil resistance sleeve can be realized, and the adjustment of the position of the oil resistance sleeve is more convenient.

3. Through set up clamping face such as hexagon nut profile structure on one-level impeller, can provide pivot locking face individual locking when lock nut, dismantle the impeller, the assembly is dismantled more simply reliably, and need not to design relevant centre gripping fixed surface characteristic and special cooperation frock alone at the pivot other end or other positions.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. The drawings in the following description are merely exemplary and other implementations drawings may be derived from the drawings provided without inventive effort for a person skilled in the art.

FIG. 1 is a partial cross-sectional view of a compressor of the present invention;

FIG. 2 is a schematic view of the construction of a primary impeller of the compressor of the present invention;

FIG. 3 is a schematic view of another view of a primary impeller of the compressor of the present invention;

fig. 4 is a schematic structural view of a rotary shaft of the compressor of the present invention.

The reference numerals are:

1. a lock nut; 2. a first diffuser; 3. a primary impeller; 4. a second diffuser; 5. a support sleeve; 6. a first reflow apparatus; 7. a second reflow apparatus; 8. an impeller; 9. a diffuser; 10. a first oil-blocking seal; 11. an oil-blocking sleeve; 12. a second oil-blocking seal; 13. a rotating shaft; 13-1, pin holes; 14. a first groove wall; 15. a bottom surface; 16. a second groove wall; 17. a first axial magnetic bearing assembly; 18. a thrust plate; 19. a motor cavity; 20. a compression chamber; 21. a first axial magnetic bearing assembly; 100. a partition; 101. a groove; 102. a void; 103. a via hole; s, a first side surface; s2, a second side surface; 3-1, clamping surface; 3-2, pins.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. It should be understood, however, that the construction, proportion, and size of the drawings, in which the present invention is practiced, are all intended to be illustrative only, and not to limit the scope of the present invention, which should be defined by the appended claims. Any structural modification, proportional change or size adjustment should still fall within the scope of the disclosure without affecting the efficacy and achievement of the present invention. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

Referring to fig. 1 in combination, according to an embodiment of the present invention, there is provided a compressor including a casing and a rotary shaft 13. The casing has a motor chamber 19, a compression chamber 20, and a partition 100 for partitioning the motor chamber 19 and the compression chamber 20. The partition 100 is provided with a through hole 103 through which the rotation shaft 13 passes. The rotating shaft 13 is driven by a motor assembly in the motor cavity 19 to drive the impeller 8 in the compression cavity 20 to rotate, so that the impeller 8 compresses the gas in the compression cavity 20. The oil-blocking sleeve 11 is fixedly sleeved on the rotating shaft 13, and can prevent the compression cavity 20 and the motor cavity 19 from blowby gas from the through hole 103.

The compressor also has an axial force adjustment structure. The position of the oil-blocking sleeve 11 is adjustable, and the first axial force applied by the oil-blocking sleeve is different under the action of the axial force adjusting structure when the oil-blocking sleeve is positioned at different positions. The oil-resistant sleeve 11 has at least two positions with different first axial force directions, and the first axial force direction is parallel to the axial direction of the rotating shaft 13.

In the above example, since the oil-blocking sleeve 11 is fixedly sleeved on the rotating shaft 13, the axial forces applied by the oil-blocking sleeve 11 at different positions are fed back to the rotating shaft 13, when the axial force applied by the impeller 8 to the rotating shaft 13 is too large, the position of the oil-blocking sleeve 11 can be adjusted, so that the direction of the first axial force applied by the oil-blocking sleeve 11 is opposite to the axial force applied by the impeller 8 to the rotating shaft 13, and the axial force applied by the impeller 8 to the rotating shaft 13 is weakened, so that the bearing pressure of the axial magnetic suspension bearing can be reduced, and the influence on the stable operation of the compressor due to the fact that the bearing pressure of the axial magnetic suspension bearing exceeds the bearing capacity range is avoided.

What needs to be explained here is: according to different working conditions of the actual operation of the compressor, the axial force data applied by the impeller 8 to the rotating shaft 13 under different working conditions can be obtained by calculating the pressure data of the working conditions, the bearing capacity range of the axial magnetic suspension bearing is combined, and the axial force adjusting structure is designed according to the axial force data, so that the oil resistance sleeve 11 can assist the axial magnetic suspension bearing to balance the axial force of the rotating shaft 13 under different working conditions.

In order to achieve the function of the axial force adjustment structure, the axial force adjustment structure includes a shielding structure that is relatively fixed to the housing, as shown in fig. 1. The oil-blocking cover 11 has a first side S on the compression chamber 20 side and a second side S2 on the motor chamber 19 side. A space 102 is provided between the first side S and the impeller 8. The oil resistant sleeve 11 is adjustable to a first position and a second position, in which the first axial force direction is different. When the oil-blocking sleeve 11 is located at the first position, only at least a portion of the first side S and at least a portion of the second side S2 of the first side S are blocked by the blocking structure, so that the pressure at the blocked position on the first side S is lower than the pressure in the gap 102, for example, if the pressure in the gap 102 is P1, the pressure at the blocked position on the first side S can be reduced to one half P1 under the action of the blocking structure, or directly reduced to 0, so that the first force applied by the air pressure in the gap 102 to the oil-blocking sleeve 11 is reduced. When the oil-blocking sleeve 11 is located at the second position, at least a part of the first side surface S and the second side surface S2 of the oil-blocking sleeve is blocked by the blocking structure, so that the pressure at the blocked position on the second side surface S2 is lower than the pressure in the motor cavity 19, for example, if the pressure in the motor cavity 19 is P2, the pressure at the blocked position on the second side surface S2 can be reduced to one half P2 under the action of the blocking structure, or is directly reduced to 0, and thus the second force exerted by the air pressure in the motor cavity 19 on the oil-blocking sleeve 11 is reduced.

In the above example, since the first axial force applied by the oil-resistant sleeve 11 is the axial resultant force of the first force applied by the air pressure in the air gap 102 to the oil-resistant sleeve 11 and the second force applied by the air pressure in the motor chamber 19 to the oil-resistant sleeve 11, the first axial force applied by the oil-resistant sleeve 11 in the first position and the second axial force applied by the oil-resistant sleeve 11 in the second position can be made different; and through designing the shielding area of the oil blocking sleeve 11 at the first position and the second position, the directions of the first axial force of the oil blocking sleeve 11 at the first position and the second position are different, so that the function of the axial force adjusting structure can be realized.

In some embodiments, as shown in fig. 1, the shielding structure may include a groove 101 disposed on a wall of the via 103, and the outer edge of the oil-blocking sleeve 11 extends into the groove 101. The groove 101 has a first groove wall 14 and a second groove wall 16, the first groove wall 14 being opposite to the first side surface S, and the second groove wall 16 being opposite to the second side surface S2. When the oil-blocking sleeve 11 is located at the first position, the shielding structure may shield at least a portion of the first side S through the first groove wall 14, and a first gap communicating with the motor cavity 19 is formed between the second groove wall 16 and the second side S2, that is, the shielding structure may not shield the second side S2, but only shield at least a portion of the first side S. Similarly, when the oil-blocking sleeve 11 is located at the second position, the shielding structure may shield at least a portion of the second side S2 through the second groove wall 16, and a second gap communicating with the gap 102 is formed between the first groove wall 14 and the first side S, that is, the shielding structure may not shield the first side S, but only shield at least a portion of the second side S2.

In the above example, when the oil-blocking cover 11 is located at the first position or the second position, the corresponding side (the first side S or the second side S2) of the oil-blocking cover 11 is blocked by the corresponding groove wall (the first groove wall 14 or the second groove wall 16) of the groove 101, so that the function of the blocking structure can be achieved, and the groove 101 is simple in structure and convenient to process.

In some embodiments, as shown in fig. 1, when the oil-blocking cover 11 is located at the first position, the first groove wall 14 may cover at least a portion of the first side S by the first comb structure. The first comb structures may be disposed only on the first groove wall 14, may be disposed only on the first side surface S, or may be disposed on both the first groove wall 14 and the first side surface S.

In the above example, the first comb-tooth structure is provided to help seal between the oil-blocking cover 11 and the via 103.

As shown in fig. 1, when the oil-blocking cover 11 is located at the second position, the second groove wall 16 shields at least a portion of the second side surface S2 by the second comb tooth structure. The second comb structures may be disposed only on the second groove wall 16, may be disposed only on the second side surface S2, or may be disposed on both the second groove wall 16 and the second side surface S2.

In the above example, the second comb-tooth structure is provided to help seal between the oil-blocking cover 11 and the via hole 103.

In some embodiments, as shown in fig. 1, the foregoing groove 101 may be an annular groove, which has a bottom surface 15 located between the first groove wall 14 and the second groove wall 16, where the bottom surface 15 is in sealing engagement with the outer edge end of the oil-blocking sleeve 11, so as to achieve sealing engagement of the oil-blocking sleeve 11 with the via 103. Preferably, the bottom surface 15 is in sealing fit with the outer edge end of the oil-blocking sleeve 11 through a third comb tooth structure. The third comb structure may be disposed only on the bottom surface 15, or may be disposed only on the outer edge end of the oil-blocking sleeve 11, or may be disposed on both the bottom surface 15 and the outer edge end of the oil-blocking sleeve 11.

In some embodiments, the foregoing compressor may further include a position adjustment mechanism for pushing the oil resistant jacket 11 to move to the different positions described above to adjust the position of the oil resistant jacket 11.

In the above example, the position of the oil-blocking sleeve 11 is advantageously adjusted according to the actual working conditions by the position adjusting mechanism provided to balance the axial force on the rotating shaft 13.

To perform the function of the position adjustment mechanism described above, the position adjustment mechanism described above may include a first axial magnetic bearing assembly 17 and a thrust plate 18, as described in fig. 1. The thrust disc 18 is sleeved and fixed on the rotating shaft 13 and is positioned between the two axial magnetic suspension bearings of the first axial magnetic suspension bearing assembly 17. The position adjusting mechanism applies force to the thrust disc 18 through the first axial magnetic suspension bearing assembly 17, so that the thrust disc 18 drives the oil resistance sleeve 11 to move to different positions through the rotating shaft 13.

In the above example, the position adjusting mechanism does not directly push the oil-blocking sleeve 11 to move, because the oil-blocking sleeve 11 is fixed on the rotating shaft 13, the position adjusting mechanism can drive the rotating shaft 13 to move by pushing the thrust disc 18, and then drive the oil-blocking sleeve 11 to move to different positions by the rotating shaft 13, so that the purpose of adjusting the position of the oil-blocking sleeve 11 by the position adjusting mechanism can be achieved.

In some embodiments, the foregoing compressor may further comprise a detection mechanism and a control mechanism. The detection mechanism is used for detecting the second axial force exerted by the impeller 8 on the rotating shaft 13. The control mechanism is used for controlling the position adjusting mechanism to push the oil blocking sleeve 11 to move to the corresponding position when the second axial force faces the first direction, so that the direction of the first axial force applied to the oil blocking sleeve 11 is opposite to the first direction.

What needs to be explained here is: the above-mentioned detecting mechanism can detect the air pressure at both sides of the impeller in the compression chamber 20, and then calculate the second axial force applied to the rotating shaft 13 by the impeller 8. The specific structure of the detection mechanism is in the prior art, and is not described herein.

In the above example, the detection mechanism, the control mechanism and the position adjusting mechanism cooperate with each other to realize automatic adjustment of the position of the oil-blocking sleeve 11, so that the position of the oil-blocking sleeve 11 is more convenient to adjust.

In a specific application example, when the oil resistant sleeve 11 is adjustable to the first position and the second position, if the first direction is the direction from the motor chamber 19 to the compression chamber 20, the control mechanism controls the position adjustment mechanism to push the oil resistant sleeve 11 to move to the second position. If the first direction is the direction from the compression chamber 20 to the motor chamber 19, the control mechanism controls the position adjusting mechanism to push the oil-resistant sleeve 11 to move to the first position.

In the above example, when the oil-resistant sleeve 11 is located at the first position, the first axial force applied to the oil-resistant sleeve 11 is in the direction from the motor chamber 19 to the compression chamber 20; when the oil-resistant sleeve 11 is in the second position, the first axial force applied to the oil-resistant sleeve 11 is in a direction from the compression chamber 20 to the motor chamber 19. By detecting the direction of the second axial force applied to the rotating shaft 13 and adjusting the oil-blocking sleeve 11 to the corresponding position, the first axial force is opposite to the second axial force, so that the effect of weakening the axial force on the rotating shaft 13 can be achieved, the bearing pressure of the axial magnetic suspension bearing can be reduced, and the influence of the bearing pressure of the axial magnetic suspension bearing on the stable operation of the compressor due to the fact that the bearing pressure exceeds the bearing capacity range can be avoided.

In some embodiments, as shown in fig. 1, the foregoing compressor also has a second axial magnetic bearing assembly 21, the second axial magnetic bearing assembly 21 being configured to apply a third axial force to the rotating shaft 13 that is within a load bearing pressure range of the second axial magnetic bearing assembly 21. The resultant force of the first axial force and the third axial force is a fourth axial force, the impeller 8 applies a fifth axial force to the rotating shaft 13, and the fourth axial force and the fifth axial force are opposite in direction, so that the second axial magnetic suspension bearing assembly 21 works within the bearing force range and the axial force on the rotating shaft 13 is balanced, thereby reducing stress concentration on the rotating shaft 13 and prolonging the service life of the rotating shaft 13.

What needs to be explained here is: the second axial magnetic bearing assembly 21 and the first axial magnetic bearing assembly 17 may be the same axial magnetic bearing assembly, which may save cost.

In one specific example of application, as shown in fig. 1, the aforementioned partition 100 may include the diffuser 9 on the compression chamber 20 side, the first oil-blocking seal 10 on the motor chamber 19 side, and the second oil-blocking seal 12 between the diffuser 9 and the first oil-blocking seal 10. The above-mentioned groove 101 is defined among the diffuser 9, the first oil-blocking seal 10 and the second oil-blocking seal 12.

The principle of axial force adjustment of the rotary shaft 13 will be described below for the sake of easy understanding.

In a specific application example, as shown in fig. 1, the first side S of the oil-blocking sleeve 11 has an S1 face opposite to the first groove wall 14 and an S3 face always opposite to the impeller 8, and the second side S2 of the oil-blocking sleeve 11 is opposite to the second groove wall 16. The pressure in the gap 102 is P1, and the pressure in the motor chamber 19 is P2.

When the oil-blocking cover 11 is at the middle position of the groove 101, the second gap formed between the first side S of the oil-blocking cover 11 and the first groove wall 14 of the groove 101 is communicated with the aforementioned gap 102, and the first gap formed between the second side S2 of the oil-blocking cover 11 and the second groove wall 16 of the groove 101 is communicated with the motor cavity 19. At this time, the S1-plane pressure p3=p1 and the S2-plane pressure p4=p2, and the first axial force f0=p1+p1×s1—p2×s2 applied to the oil-resistant jacket 11.

When the oil-resistant sleeve 11 is located at the first position, the S1 surface of the oil-resistant sleeve 11 is abutted against the first groove wall 14 of the groove 101, at this time, a seal is formed on the S1 surface, the S1 surface pressure p3=1/2P 1, the S2 surface pressure p4=p2, and at this time, the oil-resistant sleeve 11 receives a first axial force f1=p1×s3+1/2p1×s1-p2×s2. The direction of F1 is the direction from the motor chamber 19 to the compression chamber 20, which is the left direction in fig. 1.

When the oil-blocking sleeve 11 is at the second position, the S2 surface of the oil-blocking sleeve 11 is abutted against the second groove wall 16 of the groove 101, at this time, a seal is formed on the S2 surface, the S1 surface pressure p3=p1, the S2 surface pressure p4=1/2P 2, and at this time, the oil-blocking sleeve 11 receives a first axial force f2=p1×s3+p1×s1-1/2p2×s2. The direction of F2 is the direction from the compression chamber 20 to the motor chamber 19, which is the right direction in fig. 1.

In summary, it can be seen that the first axial forces to which the oil-blocking sleeve 11 is subjected are different at different positions, so that the purpose of adjusting the axial force of the rotating shaft 13 can be achieved by adjusting the oil-blocking sleeve 11 to different positions. The oil-blocking sleeve 11 can be adjusted to a corresponding first position, a second position or an intermediate position according to the actual requirement of the axial force of the rotating shaft 13 during installation.

The compressor is suitable for a magnetic suspension compressor, and the magnetic suspension compressor generates electromagnetic force through an axial magnetic suspension bearing to generate axial force on the rotating shaft 13, so that the position of the rotating shaft 13 is positioned at a set axial center position. Aiming at different working conditions of the actual operation of the compressor, the axial force data born by the rotating shaft 13 is obtained by calculating pressure data of the corresponding working conditions, the current direction and the current magnitude of the axial magnetic suspension bearing are different, the larger the current of the axial magnetic suspension bearing is, the larger the axial resultant force born by the rotating shaft 13 is, the leftward suction force is generated under the assumption that the current of the axial magnetic suspension bearing is positive, and the rightward suction force is generated under the assumption that the current of the axial magnetic suspension bearing is negative.

When the axial resultant force applied to the whole working condition rotating shaft 13 is directed to the left end of fig. 1, the current of the first axial magnetic suspension bearing assembly 17 is instantaneously increased by control, so that electromagnetic force is generated to push the rotating shaft 13, the oil-blocking sleeve 11 moves to the second position, and at the moment, the first axial force applied to the oil-blocking sleeve 11 is rightward, so that the leftward axial resultant force applied to the rotating shaft 13 can be balanced, the axial resultant force of the rotating shaft 13 is reduced after the working condition is stabilized, and the load of the first axial magnetic suspension bearing member 17 is smaller. When the axial resultant force applied to the whole working condition rotating shaft 13 is directed to the right end of fig. 1, the current of the first axial magnetic suspension bearing assembly 17 is instantaneously increased by control, so that electromagnetic force is generated to push the rotating shaft 13, the oil-blocking sleeve 11 moves to the first position, and at the moment, the first axial force applied to the oil-blocking sleeve 11 is leftwards, so that the rightward axial resultant force applied to the rotating shaft 13 can be balanced, the axial resultant force of the rotating shaft 13 is reduced after the working condition is stabilized, and the load of the first axial magnetic suspension bearing assembly is smaller.

In some embodiments, the compressor of the present invention may perform two-stage compression, as shown in fig. 1, and the compressor may further include a first diffuser 2, a second diffuser 4, and a first stage impeller 3, where the aforementioned diffuser 9 is a third diffuser, and the aforementioned impeller 8 is a second stage impeller. The compressor further comprises a support sleeve 5, a first return 6 and a second return 7.

In some embodiments, as shown in fig. 2, the compressor may have a primary impeller 3, the primary impeller 3 having an axle, the side of the axle facing away from the motor cavity 19 being provided with a clamping surface 3-1 for clamping by a wrench.

The clamping surface 3-1 may be a hexagonal nut profile structure, and the wheel hub of the primary impeller 3 is arranged on the rotating shaft 13 and is fixed with the rotating shaft 13 in the circumferential direction. Specifically, as shown in fig. 3 and 4, the impeller matching section of the rotating shaft 13 is provided with a pin hole 13-1, and the impeller matching section of the rotating shaft 13 is matched with the wheel shaft of the primary impeller 3 through a pin 3-2, wherein the pin 3-2 is inserted into the pin hole 13-1 on the rotating shaft 13. The impeller 8 and the rotating shaft 13 cannot rotate circumferentially under the limiting action of the pin 3-2.

In general, for a compressor with a double-ended suspension of an impeller, two torque wrenches are required to simultaneously clamp the double-ended lock nut 1 and lock the double-ended impeller during assembly and locking. When the impeller is disassembled, a torque wrench is needed to be used for simultaneously loosening the lock nut 1 by the reverse torque, and the situation that only one end of the lock nut 1 is loosened and the other end of the lock nut 1 is not loosened usually occurs at the moment. At this time, the non-loose end locking nut 1 is loosened by instant strong impact of a pneumatic wrench. The efficiency of this kind of dismantlement mode is lower, and pneumatic wrench powerful impact dismantles can probably influence lock nut 1 and impeller quality, dismantles many times and influences the compressor reliability. And when the rotation directions of the locking nuts 1 on the impellers at the two ends are opposite, other clamping characteristics are independently designed on the rotating shaft 13, and the locking or the dismounting is carried out by designing a matched tool.

For the compressor with two-stage impellers arranged at one end, a clamping fixing surface similar to a hexagonal nut is usually required to be independently designed at the other end of the shaft when the locking nut 1 is locked, and the clamping fixing surface is matched with a tool in design, so that the rotor structure is more complex, and the processing cost is higher.

The clamping surface 3-1 such as a hexagonal nut contour structure is arranged on the impeller, so that the hexagonal nut contour structure on the impeller can be clamped to independently lock the locking nut 1 when the locking nut 1 is locked. If the compressor is an impeller double-end suspension compressor, the impellers at the symmetrical side secondary ends of the compressor can be independently locked with the lock nut 1 in the same way, and the secondary side impellers can be independently disassembled by utilizing the hexagonal nut contour structure when the impellers are disassembled in the same way. For example, for an impeller single-end suspension compressor, the other end of the rotating shaft 13 does not need to be separately designed into a structure similar to a hexagonal nut profile. The impeller normally works and rotates clockwise, the lock nut 1 is right-handed (in the same direction as the rotation of the impeller), the symmetrical side lock nut 1 is left-handed (in the same direction as the rotation of the impeller), and the lock nuts 1 at the two ends can be prevented from loosening during operation.

According to the invention, the clamping surface 3-1 such as a hexagonal nut contour structure is arranged on the primary impeller 3, so that the impeller can be independently locked and disassembled by the locking surface of the rotating shaft 13 when the locking nut 1 is locked, the assembly and the disassembly are simpler and more reliable, and related clamping and fixing surface characteristics and special matching tools are not required to be independently designed at the other end or other parts of the rotating shaft 13.

The invention also provides a control method of the compressor, and the compressor is provided with the detection mechanism and the control mechanism. The control method of the compressor comprises the following steps:

step S1: the second axial force exerted by the impeller 8 on the rotating shaft 13 is detected.

Step S2: when the second axial force is directed to the first direction, the control position adjusting mechanism pushes the oil blocking sleeve 11 to move to the corresponding position, so that the direction of the first axial force applied to the oil blocking sleeve 11 is opposite to the first direction.

In the above example, through the cooperation of step S1 and step S2, automatic adjustment of the position of the oil-blocking sleeve 11 may be achieved, so that adjustment of the position of the oil-blocking sleeve 11 is more convenient.

In some embodiments, when the oil-blocking cover 11 is adjustable to the first position and the second position, if the first direction is the direction from the motor cavity 19 to the compression cavity 20, the position adjustment mechanism is controlled to push the oil-blocking cover 11 to move to the second position; if the first direction is from the compression chamber 20 to the motor chamber 19, the control position adjusting mechanism pushes the oil-blocking cover 11 to move to the first position.

Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims

1. A compressor, characterized in that: the motor compressor comprises a casing and a rotating shaft (13), wherein the casing is provided with a motor cavity (19), a compression cavity (20) and a partition piece (100) for separating the motor cavity (19) and the compression cavity (20), a through hole (103) for the rotating shaft (13) to pass through is formed in the partition piece (100), and the rotating shaft (13) is used for being driven by a motor component in the motor cavity (19) to drive an impeller (8) in the compression cavity (20) to rotate; the oil blocking sleeve (11) is fixedly sleeved on the rotating shaft (13) and can prevent the compression cavity (20) and the motor cavity (19) from channeling from the through hole (103);

the compressor is also provided with an axial force adjusting structure, the position of the oil blocking sleeve (11) is adjustable, and when the oil blocking sleeve is positioned at different positions, the first axial force born by the oil blocking sleeve is different under the action of the axial force adjusting structure; the oil-blocking sleeve (11) is provided with at least two positions with different first axial force directions, and the first axial force directions are parallel to the axial direction of the rotating shaft (13).

2. The compressor as set forth in claim 1, wherein: the axial force adjusting structure comprises a shielding structure which is relatively fixed with the shell, the oil blocking sleeve (11) is provided with a first side surface (S) positioned on the side of the compression cavity (20) and a second side surface (S2) positioned on the side of the motor cavity (19), and a gap (102) is formed between the first side surface (S) and the impeller (8); the oil resistance sleeve (11) can be adjusted to a first position and a second position with different first axial force directions;

wherein, when the oil blocking sleeve (11) is positioned at the first position, only at least one part of the first side surface (S) and the second side surface (S2) of the oil blocking sleeve is blocked by the blocking structure, so that the pressure at the blocked position on the first side surface (S) is lower than the pressure in the gap (102); and when in the second position, only at least a part of the second side (S2) of the first side (S) and the second side (S2) is shielded by the shielding structure, so that the pressure at the shielded position on the second side (S2) is lower than the pressure in the motor cavity (19).

3. The compressor as set forth in claim 2, wherein: the shielding structure comprises a groove (101) arranged on the wall of the through hole (103), and the outer edge of the oil blocking sleeve (11) stretches into the groove (101); the groove (101) has a first groove wall (14) opposite the first side (S) and a second groove wall (16) opposite the second side (S2); wherein,

when the oil blocking sleeve (11) is positioned at the first position, the shielding structure shields at least one part of the first side surface (S) through the first groove wall (14), and a first gap communicated with the motor cavity (19) is formed between the second groove wall (16) and the second side surface (S2); and/or when the oil blocking sleeve (11) is positioned at the second position, the shielding structure shields at least one part of the second side surface (S2) through the second groove wall (16), and a second gap communicated with the gap (102) is formed between the first groove wall (14) and the first side surface (S).

4. A compressor as claimed in claim 3, wherein:

when the oil blocking sleeve (11) is positioned at the first position, the first groove wall (14) shields at least one part of the first side surface (S) through a first comb tooth structure; and/or when the oil blocking sleeve (11) is positioned at the second position, the second groove wall (16) shields at least part of the second side surface (S2) through a second comb tooth structure.

5. A compressor as claimed in claim 3, wherein:

the groove (101) is an annular groove, the annular groove is provided with a bottom surface (15) positioned between the first groove wall (14) and the second groove wall (16), and the bottom surface (15) is in sealing fit with the outer edge end part of the oil blocking sleeve (11) so as to realize sealing fit of the oil blocking sleeve (11) and the through hole (103).

6. The compressor according to any one of claims 1 to 5, wherein: the device also comprises a position adjusting mechanism;

the position adjusting mechanism is used for pushing the oil blocking sleeve (11) to move to different positions so as to adjust the position of the oil blocking sleeve (11).

7. The compressor as set forth in claim 6, wherein:

the position adjusting mechanism comprises a first axial magnetic suspension bearing assembly (17) and a thrust disc (18), wherein the thrust disc (18) is fixedly sleeved on the rotating shaft (13) and is positioned between two axial magnetic suspension bearings of the first axial magnetic suspension bearing assembly (17);

the position adjusting mechanism applies force to the thrust disc (18) through the first axial magnetic suspension bearing assembly (17), so that the thrust disc (18) drives the oil blocking sleeve (11) to move to different positions through the rotating shaft (13).

8. The compressor as set forth in claim 6, wherein: the device also comprises a detection mechanism and a control mechanism;

the detection mechanism is used for detecting the second axial force applied by the impeller (8) to the rotating shaft (13);

the control mechanism is used for controlling the position adjusting mechanism to push the oil blocking sleeve (11) to move to the corresponding position when the second axial force faces to the first direction, so that the direction of the first axial force born by the oil blocking sleeve (11) is opposite to the first direction.

9. The compressor as set forth in claim 8, wherein:

when the oil resistance sleeve (11) can be adjusted to a first position and a second position, if the first direction is from the motor cavity (19) to the compression cavity (20), the control mechanism controls the position adjusting mechanism to push the oil resistance sleeve (11) to move to the second position; if the first direction is from the compression cavity (20) to the motor cavity (19), the control mechanism controls the position adjusting mechanism to push the oil resistance sleeve (11) to move to the first position.

10. The compressor according to any one of claims 1 to 5, 7 to 9, wherein:

the compressor further comprises a second axial magnetic suspension bearing assembly (21), the second axial magnetic suspension bearing assembly (21) is used for applying a third axial force to the rotating shaft (13), the third axial force is located in the bearing pressure range of the second axial magnetic suspension bearing assembly (21), the resultant force of the first axial force and the third axial force is a fourth axial force, and the impeller (8) is used for applying a fifth axial force to the rotating shaft (13), and the fourth axial force is opposite to the fifth axial force.

11. The compressor according to any one of claims 1 to 5, 7 to 9, wherein:

the compressor is provided with a primary impeller (3), the primary impeller (3) is provided with a wheel shaft, and a clamping surface (3-1) for clamping a spanner is arranged on one side of the wheel shaft, which is away from the motor cavity (19).

12. A control method of a compressor as claimed in claims 8 and 9, characterized by: comprising the following steps:

detecting a second axial force applied by the impeller (8) to the rotating shaft (13);

when the second axial force faces to the first direction, the position adjusting mechanism is controlled to push the oil blocking sleeve (11) to move to the corresponding position, so that the direction of the first axial force applied to the oil blocking sleeve (11) is opposite to the first direction.

13. The control method of the compressor according to claim 12, wherein:

when the oil resistance sleeve (11) can be adjusted to a first position and a second position, if the first direction is the direction from the motor cavity (19) to the compression cavity (20), the position adjusting mechanism is controlled to push the oil resistance sleeve (11) to move to the second position; if the first direction is from the compression cavity (20) to the motor cavity (19), the control position adjusting mechanism pushes the oil blocking sleeve (11) to move to the first position.