CN111927820A - Compressor rotor structure and compressor - Google Patents

Abstract

The invention relates to a compressor rotor structure and a compressor, wherein the compressor rotor structure comprises a rotating shaft, the rotating shaft is axially divided into a first section shaft, a second section shaft and a third section shaft which are sequentially connected, at least two impellers are arranged on the first section shaft and the third section shaft, and a damper is arranged on the second section shaft. The damper is arranged on the second section shaft connected between the first section shaft and the third section shaft, so that in the using process, when at least four impellers at two ends of the rotating shaft rotate to do work, the damper can effectively improve the integral supporting rigidity, and even if the weight at two ends of the rotating shaft is heavier, the fixed frequency of a compressor rotor structure cannot be too low. In other words, the fixed frequency of the compressor rotor structure can be improved, and the amplitude in use is reduced, so that the stability of the compressor rotor structure is improved, and the instability is avoided.

Description

Compressor rotor structure and compressor

Technical Field

The invention relates to the technical field of centrifugal compressors, in particular to a compressor rotor structure and a compressor.

Background

With the continuous development of the technical field of centrifugal compressors, four-stage compression compressors are gradually widely used. The four-stage compression compressor is a compressor with four impellers arranged on a rotating shaft of the compressor, and the four impellers are distributed at two ends of the rotating shaft in pairs. Generally, in order to adapt to the characteristics of a new refrigerant and ensure the normal operation of the compressor, the size of the impeller is designed to be larger. With the increase of the size of the impeller, the weight of the whole two ends of the rotating shaft is heavier. In the use process, the stability is low, and instability is easy to occur. However, the center of gravity of the compressor rotating shaft with the structure is close to the geometric center, and the operation stability of the compressor rotating shaft cannot be improved by adjusting the position of the center of gravity. Under the condition that the mass is heavy and the coincidence degree of the gravity center and the geometric center is high, the stability is further improved by adopting any mode, and the situation of instability is avoided, which is a design problem in the field.

Disclosure of Invention

The invention provides a compressor rotor structure and a compressor, aiming at the problems that a rotating shaft of a general four-stage compression compressor is low in stability and easy to be instable in the rotating process.

The utility model provides a compressor rotor structure, includes the pivot, the pivot divide into first section axle, second section axle and the third section axle that connects gradually in the axial, first section axle with the epaxial at least two impellers that all are equipped with of third section, the epaxial attenuator that is equipped with of second section.

According to the scheme, the damper is arranged on the second section shaft connected between the first section shaft and the third section shaft, so that in the using process, when at least four impellers at two ends of the rotating shaft rotate to do work, the damper can effectively improve the overall supporting rigidity, and even if the weight at two ends of the rotating shaft is heavier, the fixed frequency of the compressor rotor structure cannot be too low. In other words, the fixed frequency of the compressor rotor structure can be improved, and the amplitude in use is reduced, so that the stability of the compressor rotor structure is improved, and the instability is avoided.

In one embodiment, a support bearing and the damper are arranged at one end of the second section shaft close to the first section shaft, and/or a support bearing and the damper are also arranged at one end of the second section shaft close to the third section shaft.

In one embodiment, the damper is located outside the corresponding support bearing.

In one embodiment, two shaft shoulders are arranged on the second section of shaft at positions corresponding to the support bearings, the support bearings are limited between the two shaft shoulders, and the dampers are arranged on the shaft shoulders corresponding to the outer sides of the support bearings.

In one embodiment, a supporting shaft sleeve is arranged between each impeller on the same section of shaft, locking parts used for locking the impellers on the rotating shaft are arranged at two ends of the rotating shaft, the locking parts are tightly abutted to the impeller on the outermost side, and the impeller closer to the inner side of the two impellers on the same section of shaft is tightly abutted to the shaft shoulder.

In one embodiment, the damper comprises an inner ring, an outer ring and a buffer piece for supporting the inner ring in the outer ring, the inner ring is sleeved on the shaft shoulder, and the outer ring is used for being connected with the damper supporting seat.

In one embodiment, the damper comprises an inner ring, an outer ring and a buffer piece for supporting the inner ring in the outer ring, the inner ring is sleeved on the second section shaft, and the outer ring is used for being connected with the damper supporting seat.

In one embodiment, the buffer member is an elastic support member, the elastic support member is arranged along the radial direction of the inner ring, one end of the elastic support member is connected with the inner ring, and the other end of the elastic support member is connected with the outer ring.

In one embodiment, the elastic support is a plurality of compression springs, and the plurality of compression springs are uniformly distributed at intervals in the circumferential direction of the outer ring.

In one embodiment, the buffer member includes a first magnetic member disposed on the inner ring and a second magnetic member disposed on the outer ring, the first magnetic member and the second magnetic member are disposed in a one-to-one correspondence, the first magnetic member and the second magnetic member repel each other, the buffer members are multiple, and the plurality of buffer members are uniformly distributed at intervals in the circumferential direction of the outer ring.

A compressor comprises the compressor rotor structure.

According to the scheme, the compressor rotor structure is adopted, and in the using process, the damper can improve the supporting rigidity of the rotating shaft, so that the fixed frequency of the compressor rotor structure is improved, the amplitude in use is reduced, the stability is improved, and the instability is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a rotor structure of a compressor according to the present embodiment;

FIG. 2 is a front view of the damper according to the present embodiment;

figure 3 is a cross-sectional view of the damper shown in figure 2.

Description of reference numerals:

10. a compressor rotor structure; 11. a rotating shaft; 111. a first section of shaft; 112. a second section of shaft; 1121. a shaft shoulder; 113. a third section of shaft; 12. an impeller; 13. a damper; 131. an inner ring; 132. an outer ring; 133. an elastic support member; 14. a support bearing; 15. a support sleeve; 16. and a locking member.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1, in one embodiment, a rotor structure 10 of a compressor is provided, which includes a rotating shaft 11, and the rotating shaft 11 is divided into a first section shaft 111, a second section shaft 112 and a third section shaft 113 connected in sequence in an axial direction. At least two impellers 12 are arranged on the first section shaft 111 and the third section shaft 113. In the embodiment shown in fig. 1, two impellers 12 are arranged on each of the first section shaft 111 and the third section shaft 113. When the rotating shaft 11 rotates, centrifugal force generated by high-speed rotation of the impeller 12 applies work to the refrigerant, the refrigerant is gradually compressed, and finally the high-temperature and high-pressure refrigerant is formed. In order to adapt to the characteristics of a new refrigerant, the impeller 12 in the present application has a large size and a heavy weight, which results in a heavy weight at both ends of the rotating shaft 11.

Based on this, as shown in fig. 1, the second stage shaft 112 is provided with a damper 13. Therefore, in the using process, when at least four impellers 12 at two ends of the rotating shaft 11 do work in a rotating mode, the damper 13 can effectively improve the overall supporting rigidity. According to the formula

(where ω is_nFor fixed frequency, k is stiffness, and m is mass), even if the mass at both ends of the rotating shaft 11 is heavy, resulting in a large mass m, the setting of the damper 13 can make the stiffness m large, and thus the fixed frequency of the compressor rotor structure 10 will not be too low. The magnitude of the fixed frequency reflects the rotating speed of the rotating shaft 11 when resonance occurs, and the fixed frequencyThe higher the speed at which resonance occurs. Therefore, the higher the fixed frequency is, the larger the difference between the rotation speed of the compressor rotor structure 10 during operation and the rotation speed during resonance is, so that the occurrence of instability due to too large amplitude can be effectively avoided. In other words, the damper 13 can increase the fixed frequency of the compressor rotor structure 10, and reduce the amplitude of the compressor rotor structure during use, thereby increasing the stability of the compressor rotor structure 10 and avoiding the occurrence of instability.

Further, as shown in fig. 1, a support bearing 14 is disposed on the second-stage shaft 112, and the support bearing 14 and the damper 13 are sequentially disposed in an axial direction of the second-stage shaft 112.

Further specifically, as shown in fig. 1, in one embodiment, the supporting bearing 14 and the damper 13 are disposed on one end of the second-stage shaft 112 close to the first-stage shaft 111.

Similarly, the supporting bearing 14 and the damper 13 are also disposed at one end of the second-stage shaft 112 close to the third-stage shaft 113.

In other words, as shown in fig. 1, the support bearing 14 and the damper 13 may be disposed at both ends of the second section shaft 112, so that the support bearing 14 and the damper 13 are disposed at positions on the rotating shaft 11 closer to the impeller 12, thereby improving the stability of the rotating shaft 11 during operation. Moreover, the damper 13 is arranged at the end part of the second section of the shaft 112 close to the impeller 12, so that the swinging of two suspension sections of the rotating shaft 11 can be prevented from being transmitted to the middle part of the rotating shaft 11, and the swinging of the suspension sections can be limited and offset in time. The suspension section of the rotating shaft 11 refers to a portion of the rotating shaft 11 located outside the support bearing 14 for suspending the impeller 12, in other words, the first section shaft 111 and the third section shaft 113.

Further, in one embodiment, the compressor rotor structure 10 is a center-symmetrical structure, and the center of symmetry of the compressor rotor structure 10 is the geometric center of the rotating shaft 11. Or the compressor rotor structure 10 is an axisymmetric structure, and the symmetry axis of the compressor rotor structure 10 is perpendicular to the axis of the rotating shaft and passes through the midpoint of the axis of the rotating shaft. Based on this, the symmetry of the two ends of the rotor structure 10 of the compressor is higher, the rotation process is more stable,

further specifically, as shown in fig. 1, in one embodiment, the damper 13 is located outside the corresponding support bearing 14. It is assumed that, as shown in fig. 1, four impellers 12 are provided on the rotating shaft 11, and each impeller 12 from left to right in fig. 1 is a first impeller, a second impeller, a third impeller, and a fourth impeller. One of the dampers 13 is located between the second impeller and the corresponding support bearing 14 and the other damper 13 is located between the third impeller and the corresponding support bearing 14. When the rotating shaft 11 rotates, the first section shaft 111 and the third section shaft 113 are stressed and vibrate greatly, the damper 13 is arranged between the corresponding supporting bearing 14 and the corresponding impeller 12, and the amplitude caused by the impeller 12 can be counteracted to the greatest extent, so that the vibration degree is reduced, and the rotating shaft 11 and the supporting bearing 14 are protected.

Further, as shown in fig. 1, in an embodiment, two shoulders 1121 are disposed on the second section of shaft 112 at positions corresponding to the support bearings 14, the support bearings 14 are limited between the two shoulders 1121, and the damper 13 is disposed on the shoulder 1121 corresponding to the outer side of the support bearing 14. Here, the shoulder 1121 on the outer side of the support bearing 14 refers to the shoulder 1121 on the outer side of the support bearing 14 in the axial direction of the rotating shaft 11 or on the side of the support bearing 14 away from the center of the rotating shaft 11.

The impeller 12 can be tightly abutted against the shaft shoulder 1121 at the outer side of the support bearing 14, so that the overall structure is more compact, the lengths of the first section shaft 111 and the second section shaft 112 are made to be smaller as much as possible, the hanging sections at the two ends of the rotating shaft 11 are shorter, and the overall stability is improved.

The shoulder 1121 may be an annular projection provided on the rotating shaft 11, and the support bearing 14 is limited between the two annular projections.

Further, in an embodiment, a supporting shaft sleeve 15 is disposed between each impeller 12 located on the same section of shaft, locking members 16 for locking the impellers 12 on the rotating shaft 11 are disposed at two ends of the rotating shaft 11, the locking members 16 abut against the outermost impeller 12, and the impeller 12 closer to the inner side of the two impellers 12 located on the same section of shaft abuts against the shaft shoulder 1121.

The locking member 16, the support shaft sleeve 15 and the shaft shoulder 1121 limit each impeller 12 on the first section of shaft 111 or the third section of shaft 113, so that the running stability of each impeller 12 is guaranteed. On the other hand, because at least two impellers 12 are arranged on the first-stage shaft 111 and the third-stage shaft 113, the two-end suspension section of the compressor rotor structure 10 in the present application is not only long in axial length but also heavy in weight compared to the rotating shaft 11 suspending only one impeller 12. Therefore, it is more necessary to provide the damper 13 to increase the supporting rigidity of the rotating shaft 11, so that the fixed frequency is not too low, and the stability during operation is ensured to be high.

Specifically, the locking member 16 may be a locking nut.

Further specifically, in one embodiment, as shown in fig. 2 and 3, the damper 13 includes an inner ring 131, an outer ring 132, and a buffer member for supporting the inner ring 131 in the outer ring 132. The inner ring 131 is sleeved on the second section shaft 112, and the outer ring 132 is used for being connected with a supporting seat of the damper 13.

When the inner ring 131 is displaced relative to the outer ring 132, the buffer provides resistance to the inner ring 131 to prevent the inner ring 131 from being displaced. The greater the deflection of the inner race 131, the greater the resistance provided by the buffer. Thereby effectively preventing the shaft sleeved by the inner ring 131 from vibrating.

Specifically, the buffer member may be a buffer liquid filled between the inner ring 131 and the outer ring 132, and the buffer liquid is filled between the inner ring and the outer ring.

Or the buffer part comprises a first magnetic part arranged on the inner ring 131 and a second magnetic part arranged on the outer ring 132, the first magnetic part and the second magnetic part are arranged in a one-to-one correspondence manner, and the first magnetic part and the second magnetic part repel each other. The first magnetic members and the second magnetic members are both multiple, and the multiple first magnetic members are uniformly distributed at intervals in the circumferential direction of the inner ring 131. The buffer members formed by the first magnetic member and the second magnetic member are plural, and the plural buffer members are uniformly distributed in the circumferential direction of the outer ring 132 at intervals, so that the inner ring 131 is stably located in the outer ring 132.

Alternatively, as shown in fig. 2 and 3, the buffer member is an elastic support member 133 disposed between the inner ring 131 and the outer ring 132. When the rotating shaft 11 vibrates, the inner ring 131 deflects relative to the inner ring 131, and the elastic support 133 provides a restoring force for the inner ring 131 to prevent the rotating shaft 11 from vibrating and deflecting, so that the effect of improving the rigidity of the rotating shaft 11 is achieved. The outer ring 132 is disposed on the supporting seat of the damper 13, and when the inner ring 131 is not acted by the rotating shaft 11, the relative position between the inner ring 131 and the outer ring 132 is stable under the action of the elastic supporting member 133. Only when the shaft 11 vibrates to press the inner ring 131, the inner ring 131 is displaced, a portion of the elastic support 133 is compressed, and the other portion of the elastic support 133 is stretched. The pressed and stretched elastic support 133 applies a restoring force to the inner race 131 against the deflection of the rotation shaft 11 due to vibration. The higher the rotation speed of the rotating shaft 11 is, the larger the original vibration is, but the more significant the damping effect that can be exerted on the damper 13 due to the larger vibration is, so that the compressor rotor structure 10 does not become unstable even when the rotation speed of the rotating shaft 11 is high. Thereby achieving the purposes of offsetting vibration and improving stability.

Further, in one embodiment, in order to avoid friction with the inner ring 131 during normal rotation of the rotating shaft 11, the inner ring 131 is in clearance fit with the rotating shaft 11. The damper 13 is only activated when the shaft 11 vibrates to a certain extent, ensuring the compressor rotor structure 10 to operate normally.

Further, the inner circumferential surface of the inner ring 131 may be processed to have a low roughness and be smooth, and to have less abrasion even when contacting the rotating shaft 11.

More specifically, as shown in fig. 1, when the shaft shoulder 1121 is disposed on the rotating shaft 11, the inner ring 131 is sleeved on the shaft shoulder 1121. The inner ring 131 and the shoulder 1121 may also be in a clearance fit.

Further specifically, as shown in fig. 2 and 3, the inner ring 131 and the outer ring 132 are circles.

Specifically, in one embodiment, as shown in fig. 2 and 3, the elastic support 133 is disposed along a radial direction of the inner ring 131, one end of the elastic support 133 is connected to the inner ring 131, and the other end of the elastic support 133 is connected to the outer ring 132.

When the inner ring 131 is deviated relative to the outer ring 132, the elastic support 133 disposed along the radial direction of the inner ring 131 is pressed or stretched, and the elastic support 133 can provide a restoring force for the inner ring 131 to resist the vibration of the rotating shaft 11.

Specifically, the support seat of the damper 13, to which the outer ring 132 is connected, may be disposed on the compressor body. At the same time, a support structure for supporting the support bearing 14 may also be connected to the body of the compressor.

More specifically, in one embodiment, the elastic support 133 is a plurality of compression springs, and the plurality of compression springs are uniformly spaced around the circumference of the outer ring 132. The compression springs are evenly spaced to provide uniform force in all directions on the inner ring 131.

Further, in another embodiment, a compressor is provided, comprising the compressor rotor structure 10 described above.

According to the scheme, the compressor rotor structure 10 in any one of the embodiments is adopted, and the damper 13 can improve the supporting rigidity of the rotating shaft 11 in the using process, so that the fixed frequency of the compressor rotor structure 10 is improved, the amplitude in use is reduced, the stability is improved, and the instability is avoided.

Further, in one embodiment, the compressor further comprises a housing, the housing having a mounting cavity therein, the compressor rotor structure 10 being disposed in the mounting cavity. The compressor rotor structure is characterized in that a damper supporting seat and a bearing supporting seat are arranged in the installation cavity, the damper 13 is arranged on the damper supporting seat, and the supporting bearing 14 is arranged on the bearing supporting seat, so that the compressor rotor structure 10 can be stably located in the installation cavity.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. The utility model provides a compressor rotor structure, its characterized in that, includes the pivot, the pivot divide into first section axle, second section axle and the third section axle that connects gradually in the axial, first section axle with the epaxial at least two impellers that all are equipped with of third section, the epaxial attenuator that is equipped with of second section.

2. The compressor rotor structure of claim 1, wherein the end of the second shaft segment adjacent to the first shaft segment is provided with a support bearing and the damper, and/or the end of the second shaft segment adjacent to the third shaft segment is also provided with a support bearing and the damper.

3. The compressor rotor structure of claim 2, wherein the damper is located outside the corresponding support bearing.

4. The compressor rotor structure of claim 3, wherein the second section of shaft is provided with two shoulders at positions corresponding to the support bearings, the support bearings are limited between the two shoulders, and the dampers are arranged on the shoulders corresponding to the outer sides of the support bearings.

5. The rotor structure of a compressor as claimed in claim 4, wherein a supporting shaft sleeve is provided between each impeller on the same shaft, locking members for locking the impellers on the shaft are provided at both ends of the shaft, the locking members are abutted against the outermost impeller, and the impeller closer to the inner side of the two impellers on the same shaft is abutted against the shoulder.

6. The compressor rotor structure according to claim 4 or 5, wherein the damper includes an inner ring, an outer ring, and a buffer member for supporting the inner ring in the outer ring, the inner ring being fitted over the shaft shoulder, and the outer ring being adapted to be connected to the damper support base.

7. The compressor rotor structure according to any one of claims 1 to 5, wherein the damper includes an inner ring, an outer ring, and a buffer member for supporting the inner ring in the outer ring, the inner ring being fitted over the second segment shaft, and the outer ring being adapted to be connected to the damper support base.

8. The compressor rotor structure according to claim 7, wherein the buffer member is an elastic support member, the elastic support member is disposed in a radial direction of the inner ring, one end of the elastic support member is connected to the inner ring, and the other end of the elastic support member is connected to the outer ring.

9. The compressor rotor structure of claim 8, wherein the elastic support is a plurality of compression springs that are evenly spaced in a circumferential direction of the outer ring.

10. The compressor rotor structure of claim 7, wherein the buffer member includes a first magnetic member disposed on the inner ring and a second magnetic member disposed on the outer ring, the first magnetic member and the second magnetic member are disposed in one-to-one correspondence, the first magnetic member and the second magnetic member repel each other, the buffer members are plural, and the plurality of buffer members are uniformly spaced in a circumferential direction of the outer ring.

11. A compressor, characterized by comprising the compressor rotor structure of any one of claims 1 to 10.

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