A compressor rotor
By adopting a central tie rod structure and damping platform design on the compressor rotor, combined with the tight fit between the interstage shaft and the tie rod nut, the problem of compressor rotor vibration control was solved, and stable operation at high speed was achieved.
Patent Information
- Application Number
- CN202522509398.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-26
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-11-26
AI Technical Summary
Vibration of the compressor rotor is difficult to control within an acceptable range, especially in multi-stage compressors where the slender shaft rotor is prone to exceeding the critical speed when rotating at high speed, making vibration control a critical issue.
The design employs a central tie rod structure, with both ends of the central tie rod fixed and a damping platform in the middle equipped with elastic damping material. Combined with the tight fit between the interstage shaft and the tie rod nut, it suppresses rotor vibration.
It effectively suppresses the vibration of the compressor rotor, ensuring that the vibration is within an acceptable range when rotating at high speed, thereby improving the stability and reliability of the rotor.
Smart Images
Figure CN224943993U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of compressor rotor technology, and in particular to a compressor rotor. Background Technology
[0002] The compressor rotor is the core rotating component of the compressor, primarily responsible for converting mechanical energy into the kinetic or pressure energy of the gas. It drives gas flow through high-speed rotation and compresses the gas, increasing its pressure and temperature. Compressors used in energy storage systems are generally multi-stage compressors. The rotors of multi-stage compressors are typically slender shaft rotors. These slender shaft rotors often exceed the first or even second critical speed when rotating at high speeds, making them typical flexible rotors. Vibration control must be carefully considered during design and manufacturing.
[0003] In the process of realizing this utility model, the inventors discovered that the vibration of the compressor rotor is difficult to control within an acceptable range. Summary of the Invention
[0004] The purpose of this invention is to provide a compressor rotor that generates less vibration during operation.
[0005] To achieve this objective, a compressor rotor is provided, including at least one central tie rod. The compressor rotor components are mounted on the central tie rod. The central tie rod is subjected to axial tension under the action of the fixed structures at both ends, and the compressor rotor components are pressed together by the two fixed ends of the central tie rod. A damping platform is provided in the middle of the central tie rod, and the inner hole of the compressor rotor component located at the damping platform is tightly fitted with the damping platform to suppress the vibration generated when the compressor rotor rotates.
[0006] Furthermore, it includes two central tie rods, one end of which is fixed by an interstage shaft, and the other end of each central tie rod is fixed by a tie rod nut.
[0007] Furthermore, the inner bore of the compressor rotor component at the damping platform is provided with a mating boss, and the mating boss of the inner bore of the component is tightly fitted with the damping platform of the central tie rod.
[0008] Furthermore, the damping platform is equipped with damping pads made of elastic damping material to improve the damping platform's ability to absorb vibrations.
[0009] Furthermore, the damping platform is located in the area at the midpoint of the fixing points at both ends of the central tie rod.
[0010] Furthermore, the damping platform is an annular boss arranged around the central tie rod.
[0011] Furthermore, the damping platform is an annular boss arranged around the central tie rod; the mating boss is an annular boss arranged around the inner hole of the compressor rotor component, and the annular damping platform and the annular mating boss are positioned and matched in shape.
[0012] Furthermore, the compressor rotor components are equipped with a weight-removing structure, which is evenly distributed at the center hole of the components.
[0013] Furthermore, the compressor rotor includes an impeller, which is clearance-fitted with the central tie rod of the central hole.
[0014] Furthermore, the compressor rotor balance disc has a center hole that is clearance-fitted with the center tie rod.
[0015] Furthermore, the interstage shaft is disc-shaped, and both sides of the interstage shaft have internal threads for threaded connection with the external threads at the end of the central tie rod.
[0016] One of the above technical solutions has the following advantages or beneficial effects: the compressor rotor includes at least one central tie rod, the compressor rotor components are mounted on the central tie rod, the central tie rod is subjected to axial tension under the action of the fixed structures at both ends, and the compressor rotor components are pressed together by the two fixed ends of the central tie rod; a damping platform is provided in the middle of the central tie rod, and the central tie rod is tightly fitted with the inner hole of the compressor rotor components at the damping platform. The central tie rod on the rotor of the present invention also has a fixed point in the middle, which can effectively suppress the vibration when the central tie rod rotates. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of a compressor rotor provided in an embodiment.
[0018] In the diagram: 1-Central tie rod; 11-Damping platform; 2-Tie rod nut; 3-Matching boss; 31-Thrust plate; 32-Bearing seat; 33-Impeller; 34-Balance plate; 35-Flange; 4-Interstage shaft; 5-Weight removal structure. Detailed Implementation
[0019] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0020] Example 1: like Figure 1 As shown, the compressor rotor has a central tie rod, and the components on the shaft are fitted onto the central tie rod. A constant axial tensile force, or preload, is applied to the central tie rod at both ends via nuts, disc springs, or a hydraulic tensioner. Optionally, a constant axial tensile force is applied to the central tie rod via a tie rod nut. A flange for axially clamping the components on the shaft is provided on the side of the tie rod nut away from the end of the central tie rod.
[0021] When the compressor rotor shaft is long, such as in a multi-stage compressor rotor with a single central tie rod, the excessive length of a single tie rod exacerbates rotor vibration. Therefore, in this embodiment, the compressor rotor employs two or more central tie rods. These central tie rods 1 are connected and fixed together via interstage shafts 4. With two or more central tie rods, the shortened length of each individual tie rod increases its stiffness, thereby altering its natural frequency and reducing its amplitude.
[0022] The interstage shaft 4, used to connect the two central tie rods, is a disc-shaped part. The side walls of the disc-shaped interstage shaft 4 have structures for fixing the central tie rods. Optionally, the interstage shaft 4 and the central tie rod 1 are connected by threads. Preferably, the side wall of the interstage shaft 4 has a threaded hole located at the center of the disc-shaped interstage shaft 4, and the end of the central tie rod 1 has an external thread. The central tie rod 1 and the interstage shaft 4 are connected by threads, and both sides of the interstage shaft 4 are connected to parts on the rotor shaft. Optionally, the threaded connection structure between the interstage shaft 4 and the central tie rod 1 can also be: the center of the side wall of the interstage shaft 4 has a threaded post, and the end of the central tie rod 1 has a threaded hole, which is screwed onto the threaded post of the interstage shaft 4. Optionally, when both sides of the interstage shaft 4 are connected to the central tie rod 1, threaded holes or threaded posts are respectively provided at the center of both sides of the interstage shaft 4.
[0023] like Figure 1 As shown, a damping platform is provided on the central tie rod 1. The damping platform is a boss structure protruding from the surface of the central tie rod 1, and the inner hole of the part on the damping platform is tightly fitted to the central tie rod 1. The damping platform is located at the position of greatest vibration on the central tie rod 1, usually in the midpoint area between the two fixed points of the central tie rod 1, generally located near the midpoint between the two fixed points of the central tie rod 1. The tight fit between the component on the shaft and the damping platform of the central tie rod is equivalent to adding a radial fixed point of the tie rod on the damping platform. Therefore, the central tie rod in this embodiment has three fixed positions, namely the two ends and the middle of the tie rod. This structure can effectively suppress the vibration when the central tie rod 1 rotates. Optionally, the damping platform is an annular boss arranged around the central tie rod 1.
[0024] Furthermore, a damping pad made of elastic damping material is provided on the damping platform to improve the damping platform's vibration absorption capacity. Optionally, the damping pad is annular. The width of the annular damping pad matches the width of the damping platform, and optionally, the width of the annular damping pad is equal to the width of the damping platform. In the natural, unloaded state, the inner diameter of the annular damping pad is slightly smaller than the outer diameter of the annular damping platform, so that the damping pad is more securely mounted on the damping platform after being fitted. Optionally, in the natural, unloaded state, the clearance between the outer diameter of the annular damping pad and the parts on the rotor is 0.01-0.02 mm. The material of the above-mentioned damping pad can be high-temperature resistant rubber, polytetrafluoroethylene, or other high-temperature resistant elastomer materials.
[0025] Figure 1 A rotor with two central tie rods 1 is shown, which is used for the impeller 33 shaft of a centrifugal compressor. Two central tie rods 1 are arranged side-by-side inside the rotor and connected by an interstage shaft 4. One end of each central tie rod 1 is fixed to the interstage shaft 4, and the other end is fixed by a tie rod nut 2. Figure 1 A preferred embodiment is shown, in which a first central tie rod 1 and a second central tie rod 1 are respectively connected to both sides of the interstage shaft 4. One end of the first central tie rod 1 is fixed to one side of the interstage shaft 4, and the other end of the first central tie rod 1 is pre-tightened by a tie rod nut 2. After the central tie rod 1 is pre-tightened, the axial and axial forces of the parts on the rotor shaft at the first central tie rod 1 between the interstage shaft 4 and the nut of the central tie rod 1 are both compressed. One end of the second central tie rod 1 is fixed to the other side of the interstage shaft 4, and the other end of the second central tie rod 1 is pre-tightened by a tie rod nut 2. After the central tie rod 1 is pre-tightened, the axial and axial forces of the parts on the rotor shaft at the second central tie rod 1 between the interstage shaft 4 and the nut of the central tie rod 1 are both compressed.
[0026] like Figure 1 A damping platform is provided on the first central tie rod 1 and / or the second central tie rod 1, located at the midpoint between the interstage shaft 4 and the tie rod nut 2. The rotor of the compressor operates at high temperatures, and the central tie rod 1 is prone to increased vibration under high-temperature conditions. In practice, it has been found that the vibration is greatest at the two fixed points of the central tie rod 1. In this embodiment, the damping platform on the central tie rod 1 is located at the midpoint between these two fixed points. Considering the structure of the components on the shaft, the damping platform of the central tie rod 1 is located within the inner hole of the bearing seat 32. The bearing seat 32 refers to the shaft portion used to install the bearing. The damping platform on the central tie rod 1 and the inner hole of the bearing seat 32 are interference-fitted, also known as a tight fit.
[0027] Optionally, the inner bore of the compressor rotor components is provided with a mating boss 3, which tightly fits with the damping platform of the central tie rod 1. Because the inner bore of the compressor rotor components is provided with the mating boss 3, the height of the damping platform of the central tie rod 1 can be reduced while ensuring the pressure of the tight fit, so that other components that do not require a tight fit can be mounted on the central tie rod 1. Looking at the central tie rod 1, the support points on the central tie rod 1 are the interstage shaft 4, the tie rod nut 2, and the damping platform. Extensive testing has proven that when the aforementioned central tie rod 1 is used on the compressor rotor, the vibration of the central tie rod 1 is effectively suppressed during rotor operation. Figure 1 The bearing seat 32 has a mating boss 3 inside its inner hole, which is tightly fitted with the damping platform of the central tie rod 1. During rotor assembly, the mating boss 3 is tightly fitted with the damping platform on the central tie rod 1. Optionally, the mating boss 3 is an annular boss that surrounds the inner hole of the compressor rotor component.
[0028] The compressor rotor components also include impellers 33. Optionally, the rotor shaft may include two impellers 33, positioned on either side of the interstage shaft 4. The compressor rotor components also include a balance disc 34, which balances the axial forces generated by the multi-stage impellers 33, offsetting part of the axial load through pressure difference between the two sides. The compressor rotor components also include bearing seats 32 for mounting bearings and a thrust disc 31 that mates with the bearings, bearing residual axial forces and preventing axial movement of the rotor. The end faces of the impellers 33, balance disc 34, bearing seats 32, and thrust disc 31 are interconnected and pressed between the interstage shaft 4 and the tie rod nut 2.
[0029] Optionally, the components adjacent to the rotor's tie rod nut 2 are tightly fitted with the central tie rod 1 to suppress vibration of the central tie rod 1. For example... Figure 1 The flange and thrust plate 31 are shown.
[0030] like Figure 1 In this embodiment, the rotor includes a first central tie rod 1 and a second central tie rod 1. On the first central tie rod 1, an interstage shaft 4 is threadedly connected to it. Components on the shaft adjacent to the tie rod nut 2 are tightly fitted to the central tie rod 1. Components on the damping platform of the first central tie rod 1 are also tightly fitted to it. Other components on the shaft outside the aforementioned area are clearance-fitted to the central tie rod 1. The assembly method of the components on the second central tie rod 1 is the same as that of the first central tie rod 1. Extensive testing has proven that the vibration of the rotor, including the above structure, can always be controlled within an acceptable range during operation.
[0031] Optionally, the compressor rotor components are provided with a weight-reducing structure 5. Components with weight-reducing holes have reduced mass, which helps reduce vibration during operation. Further, the weight-reducing structure 5 is located at the center hole of the compressor rotor component that has a clearance fit with the center tie rod 1. Because the component has a clearance fit with the center tie rod 1, a weight-reducing structure 5, such as a weight-reducing hole, can be provided in the hole on the component that mates with the center tie rod 1. The weight-reducing holes can be evenly distributed around the circumference of the component, reducing vibration during rotor operation while ensuring the rotor's dynamic balance performance.
[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A compressor rotor, characterized in that, It includes at least one central tie rod, on which the compressor rotor components are mounted. The central tie rod is subjected to axial tension under the action of the fixed structures at both ends, and the compressor rotor components are pressed together by the two fixed ends of the central tie rod. A damping platform is provided in the middle of the central tie rod. The inner hole of the compressor rotor component located at the damping platform is tightly fitted with the damping platform to suppress the vibration generated when the compressor rotor rotates.
2. The compressor rotor according to claim 1, characterized in that, It includes two central tie rods, one end of which is fixed by an interstage shaft, and the other end of each central tie rod is fixed by a tie rod nut.
3. The compressor rotor according to claim 1, characterized in that, The inner hole of the compressor rotor component at the damping platform is provided with a mating boss, and the mating boss of the inner hole of the component is tightly fitted with the damping platform of the central tie rod.
4. The compressor rotor according to claim 1, characterized in that, The damping platform is equipped with a damping pad made of elastic damping material to improve the damping platform's ability to absorb vibrations.
5. The compressor rotor according to claim 1, characterized in that, The damping platform is located in the area at the midpoint of the fixing points at both ends of the central tie rod.
6. The compressor rotor according to claim 1, characterized in that, The damping platform is an annular boss arranged around the central tie rod.
7. The compressor rotor according to claim 3, characterized in that, The damping platform is an annular boss arranged around the central tie rod, and the mating boss is an annular boss arranged around the inner hole of the compressor rotor component. The annular damping platform and the annular mating boss are positioned and matched in shape.
8. The compressor rotor according to claim 1, characterized in that, The compressor rotor components are equipped with weight-removing structures, which are evenly distributed at the center holes of the components.
9. The compressor rotor according to claim 1, characterized in that, The compressor rotor includes an impeller, which is clearance-fitted with the central tie rod of the central hole.
10. The compressor rotor according to claim 2, characterized in that, The interstage shaft is disc-shaped, and both sides of the interstage shaft have internal threads for threaded connection with the external threads at the end of the central tie rod.