Rotor and compressor with damping structure

Abstract

The present invention discloses a rotor and compressor with a damping structure, which aims to solve the dynamic problems of the slender shaft rotor of a high-speed multi-stage compressor. A blind hole is provided in the middle of the shaft head end face of the rotor, and the shaft end is detachably connected to the shaft head. A damping ring is provided on the shaft head through a ring bushing, and a damping ring housing is provided outside the damping ring. The damping ring housing, the shaft head blind hole and the damping ring form a transition cavity. A first oil circuit is provided in the bearing body, a second oil circuit is provided in the damping ring, and a third oil circuit is provided on the side wall of the blind hole on the shaft head end face. The first oil circuit, the second oil circuit and the third oil circuit are connected, and the outlet of the second oil circuit is located at the ring bushing. The compressor includes a compressor housing, a rotor with a damping structure is located in the compressor housing, and a support bearing is provided on the outside of the rotating shaft behind the thrust bearing.

Description

Technical Field

[0001] The invention belongs to a high-speed rotating shaft damping structure, and in particular relates to a rotor and a compressor with the damping structure. Background Art

[0002] With the high-end development of centrifugal compressors, the rotor speed is getting higher and higher. In many application scenarios, compressors with large-span rotors are often required. Their rotors are multi-stage slender shaft structures. This type of rotor has high requirements for dynamic design.

[0003] Currently, this is typically achieved by changing the model and reducing the speed. This involves increasing the diameter of the impeller at the inlet, thickening the main shaft, and increasing the impeller diameter to meet the dynamic design requirements of this type of multi-stage slender shaft. However, this design approach often results in heavier rotors, increasing costs, and poor aerodynamic performance, making the unit less competitive in the market. Therefore, a new structure is needed to address the dynamic challenges of high-speed, multi-stage slender shaft compressors. Summary of the Invention

[0004] The present invention provides a rotor and a compressor with a damping structure, aiming to solve the rotor dynamics problem of the current high-speed multi-stage slender shaft compressor.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A rotor with a damping structure comprises a rotating shaft and a bearing body arranged outside the rotating shaft. The special feature of the rotor is that it comprises a damping ring and a damping ring housing.

[0007] A blind hole is provided in the middle of the shaft head end surface of the rotating shaft, and the shaft end of the rotating shaft is detachably connected to the shaft head; a thrust bearing is provided on the outside of the shaft end; a bearing body is provided on the outside of the thrust bearing, and a gap is left between the bearing body and the rotating shaft;

[0008] A ring liner is provided inside the damping ring, and the ring liner is sleeved outside the shaft head, with a gap left between the ring liner and the shaft head;

[0009] The damping ring housing is arranged outside the damping ring, and is fixedly connected to the bearing body, and is used to press the damping ring onto the end face of the bearing body; the damping ring housing, the blind hole on the end face of the shaft head and the damping ring form a transition cavity;

[0010] A first oil circuit is provided in the bearing body, a second oil circuit is provided in the damping ring, and a third oil circuit is provided on the side wall of the blind hole on the end face of the shaft head; the first oil circuit, the second oil circuit and the third oil circuit are connected, the inlet of the first oil circuit is used for the entry of lubricating oil, the outlet of the third oil circuit is connected to the gap between the shaft head and the bearing body, and the outlet of the second oil circuit is located at the ring liner.

[0011] Furthermore, an annular cavity is provided inside the damping ring housing;

[0012] A fourth oil circuit is provided in the damping ring housing located on the side of the annular cavity close to the shaft head. The first oil circuit, the annular cavity, the fourth oil circuit and the second oil circuit are connected in sequence.

[0013] Furthermore, the inner diameters of the first oil passage, the fourth oil passage, and the second oil passage are gradually reduced;

[0014] There are multiple second oil passages and multiple third oil passages;

[0015] The total cross-sectional area of ​​the plurality of third oil passages is greater than or equal to the total cross-sectional area of ​​the plurality of second oil passages.

[0016] Furthermore, the fourth oil circuit is arranged to be inclined relative to the radial direction of the rotating shaft, and the inlet of the fourth oil circuit faces the outlet of the first oil circuit;

[0017] The second oil circuit is arranged along the radial direction of the rotating shaft, and the inlet of the second oil circuit corresponds to the outlet of the fourth oil circuit.

[0018] The third oil circuit is arranged at an angle relative to the radial direction of the rotating shaft, and is arranged closer to the bottom of the blind hole on the end face of the shaft head relative to the second oil circuit;

[0019] The gap widths between the two ends of the ring liner and the shaft head are equal, and the gap widths between the two ends of the ring liner and the shaft head are smaller than the gap width between the middle part of the ring liner and the shaft head.

[0020] Furthermore, the blind hole on the end face of the shaft head has a diameter at both ends of the shaft in the axial direction that is smaller than the diameter in the middle thereof;

[0021] Two O-rings are provided between the damping ring housing and the damping ring, the two O-rings are respectively located at two ends of the damping ring, and the second oil circuit outlet is located between the two O-rings;

[0022] The end surface of the bearing body is in a step shape, and the step surface close to the rotating shaft is lower than the step surface away from the rotating shaft, and the two step surfaces are connected by a transition surface;

[0023] The damping ring is pressed against the step surface of the end face of the bearing body close to the rotating shaft, and the damping ring housing located on the side of the annular cavity close to the rotating shaft is located between the transition surface between the two step surfaces of the end face of the bearing body and the damping ring;

[0024] The ring liner is welded inside the damping ring;

[0025] The present invention further provides a compressor with a damping structure, comprising a compressor housing, wherein the compressor further comprises a rotor with the damping structure as described above, which is arranged in the compressor housing;

[0026] A support bearing is provided on the outside of the rotating shaft at the rear side of the thrust bearing.

[0027] Furthermore, the first oil passage is communicated with the thrust bearing and the support bearing respectively.

[0028] Furthermore, the first oil circuit includes an axial first oil circuit, multiple radial first oil circuits, an output first oil circuit, a support bearing return oil circuit, and a thrust bearing return oil circuit;

[0029] The compressor housing is provided with a radial fifth oil passage and an axial fifth oil passage;

[0030] The inlet of the fifth axial oil passage corresponds to the outlet of the fifth radial oil passage, and the inlet of the fifth radial oil passage is used for lubricating oil to enter;

[0031] The inlet of the axial first oil circuit is connected to the outlet of the axial fifth oil circuit; the multiple sections of the radial first oil circuit are all connected to the axial first oil circuit and are respectively connected to the thrust bearing and the support bearing;

[0032] The inlet of the first oil output path is connected to the radial first oil path located at the front end of the bearing body, and the outlet is communicated with the annular cavity;

[0033] The support bearing return oil passage and the thrust bearing return oil passage are both connected to the axial first oil passage.

[0034] Furthermore, the radial first oil passage is provided with three sections, one section is connected to the support bearing, and the other two sections are connected to the front side and the rear side of the thrust bearing respectively;

[0035] The thrust bearing return oil passage is arranged along the radial direction of the rotating shaft and is located in the middle of the thrust bearing;

[0036] The support bearing return oil passage is arranged obliquely relative to the axial direction of the rotating shaft;

[0037] The inlet of the support bearing return oil circuit is connected to the rear side of the support bearing, and the outlet is connected to the thrust bearing return oil circuit.

[0038] Furthermore, the bearing body comprises an upper bearing body and a lower bearing body that are engaged with each other;

[0039] The axial first oil circuit, the multi-section radial first oil circuit, the output first oil circuit, the support bearing return oil circuit and the thrust bearing return oil circuit are all opened on the lower bearing body.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The present invention has a rotor with a damping structure, and a blind hole is provided on the end face of the shaft head. Lubricating oil enters from the first oil circuit inlet under a certain pressure, and reaches the ring liner of the damping ring through the first oil circuit and the second oil circuit in sequence. During the high-speed rotation of the shaft, an oil film is formed between the ring liner of the damping ring and the shaft head, which can play a role similar to that of a supporting bearing and play a certain supporting role on the end face of the shaft. This auxiliary supporting structure can effectively limit the amplitude of the radial vibration of the shaft and has a damping and vibration reduction function. Afterwards, the lubricating oil is discharged from both ends of the ring liner, a part of which is directly discharged from the rear end of the ring liner to the gap between the shaft and the bearing body, and the other part flows from the front end of the ring liner into the transition cavity where the blind hole on the end face of the shaft head is located, and then flows out to the gap between the shaft and the bearing body through the third oil circuit. The opening of the third oil circuit can avoid the accumulation of lubricating oil at the ring liner; in addition, the shaft head and the shaft end are detachably connected, which is convenient for installation and maintenance and more convenient to use.

[0042] 2. In the present invention, the structural shape design of the damping ring housing ensures the connectivity of the entire oil circuit while also ensuring the installation stability of the damping ring.

[0043] 3. In order to effectively discharge the lubricating oil in the transition cavity where the blind hole on the shaft end face is located, the present invention designs an oil drain line from the transition cavity to the outside, that is, the sum of the cross-sectional areas of the multiple third oil passages is greater than or equal to the sum of the cross-sectional areas of the multiple second oil passages.

[0044] 4. In the present invention, the inner diameters of the first oil circuit, the fourth oil circuit and the second oil circuit are gradually reduced, so that the lubricating oil with a certain pressure entering from the inlet of the first oil circuit has a certain flow rate when it reaches the ring liner and the shaft head, thereby being conducive to the formation of an oil film at the ring liner.

[0045] 5. The blind hole on the end face of the central shaft head of the present invention has a smaller aperture at both ends than that in the middle. When the lubricating oil enters the transition cavity, this structure helps the lubricating oil to be concentrated in the transition cavity and discharged near the central oil drain hole.

[0046] 6. In addition to the above advantages, the compressor with a damping structure of the present invention is further connected with the thrust bearing and the support bearing in the first oil circuit, so that the oil in each place is in communication, which is more efficient.

[0047] 7. In the present invention, the oil flowing through the thrust bearing and the support bearing will also flow into the first oil circuit through the corresponding circuit to form a circulating oil circuit, making the overall oil circuit design of the compressor simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic diagram of an embodiment of a compressor rotor with a damping structure according to the present invention;

[0049] Figure 2 For the present invention Figure 1 A local enlargement of point A in the middle;

[0050] Figure 3 For the present invention Figure 1 Schematic diagram of the transfer shaft.

[0051] Among them: 1-rotating shaft, 2-damping ring, 3-damping ring housing, 4-O-ring, 5-bearing body, 501-upper bearing body, 502-lower bearing body, 6-nut, 7-transition cavity, 801-first oil circuit, 8011-radial first oil circuit, 8012-axial first oil circuit, 8013-output first oil circuit, 8014-support bearing return oil circuit, 8015-thrust bearing return oil circuit, 802-second oil circuit, 803-third oil circuit, 804-fourth oil circuit, 8051-radial fifth oil circuit, 8052-axial fifth oil circuit, 9-ring liner, 10-annular cavity, 11-shaft head, 12-shaft end, 13-thrust bearing, 14-support bearing, 15-compressor housing. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0053] The present invention addresses the rotor dynamics issues of high-speed, multi-stage centrifugal compressors. By adding a damping structure to the shaft and configuring corresponding oil circuits, an oil film is formed on the ring liner to suppress shaft vibration, thereby increasing the rotor's critical speed or reducing the corresponding amplification factor, thereby meeting rotor dynamics design requirements. Furthermore, the shaft end 12 and the shaft head 11 of the shaft 1 are designed to be detachably connected, facilitating assembly of the entire rotor.

[0054] The present invention is described in further detail below with reference to the accompanying drawings:

[0055] See also Figures 1 to 3, is an embodiment of a compressor rotor with a damping structure according to the present invention. In the compressor rotor involved in the present invention, a blind hole is provided in the middle of the end face of the shaft head 11 of the rotating shaft 1. The shaft end 12 of the rotating shaft 1 is detachably connected to the shaft head 11. The shaft end 12 is partially interference-fitted on the shaft head 11. The shaft head 11 is tightened by a nut 6, which is the same as the setting position of the rotating shaft 1 in a general compressor. A thrust bearing 13 is provided on the outside of the shaft end 12. The thrust bearing 13 is located in the bearing body 5, and the shaft end 12 of the rotating shaft 1 extends out of the bearing body 5, leaving a gap between the rotating shaft 1 and the bearing body 5. As a preferred solution, the shaft end 12 and the thrust bearing 13 can be integrated or split. The bearing body 5 can also be integrated or split. If it is split, it can include an upper bearing body 501 and a lower bearing body 502 that are interlocked. In order to solve the above-mentioned problem, a shaft end damping structure is provided at both ends of the rotating shaft 1, including a damping ring 2 and a damping ring housing 3. The damping ring 2 is sleeved on the outside of the shaft head 11 through the ring bushing 9. A gap is left between the ring bushing 9 and the shaft head 11, allowing lubricating oil to flow out from both ends of the gap. The damping ring housing 3 is set outside the damping ring 2. The damping ring housing 3 is fixedly connected to the bearing body 5 and is used to press the damping ring 2 against the end face of the bearing body 5. The damping ring housing 3, the blind hole on the end face of the shaft head 11 and the damping ring 2 can form a transition cavity 7. The specific shape and structure of the damping ring 2 and the damping ring housing 3 can be set in a variety of ways. Figure 1 In a preferred method, an annular cavity 10 is defined within the damping ring housing 3. The end face of the bearing body 5 is stepped, with the step surface closer to the rotating shaft 1 being axially lower than the step surface farther from the rotating shaft 1. The two step surfaces are connected by a transition surface, forming a single step. The damping ring 2 is pressed against the step surface of the bearing body 5 end face closer to the rotating shaft 1. The damping ring housing 3, located on the side of the annular cavity 10 closer to the rotating shaft 1, is positioned between the transition surface between the two step surfaces of the bearing body 5 end face and the damping ring 2. This structural form ensures a more stable installation of the damping ring 2.

[0056] A first oil circuit 801 is provided in the bearing body 5, a second oil circuit 802 is provided in the damping ring 2, a third oil circuit 803 is provided on the side wall of the blind hole of the shaft head 11 of the rotating shaft 1, and a fourth oil circuit 804 is provided in the damping ring housing 3 located on the side of the annular cavity 10 close to the rotating shaft 1. The first oil circuit 801, the annular cavity 10, the fourth oil circuit 804 and the second oil circuit 802 are connected in sequence. The inlet of the first oil circuit 801 is used for the entry of lubricating oil, and the outlet of the third oil circuit 803 is connected to the gap between the rotating shaft 1 and the bearing body 5 for the discharge of lubricating oil. The outlet of the second oil circuit 802 is located at the ring liner 9, which is used to guide the lubricating oil to between the shaft head 11 and the damping ring 2 when the lubricating oil flows out of the second oil circuit 802, so that an oil film is formed at the shaft head 11 when the rotor runs at high speed.

[0057] The compressor formed by using the above-mentioned rotor with a damping structure in a compressor includes, in addition to the above-mentioned rotor with a damping structure, a compressor housing 15. The rotor with a damping structure is arranged in the compressor housing 15. A support bearing 14 is also provided on the outside of the rotating shaft 1 at the rear side of the thrust bearing 13. A radial fifth oil passage 8051 and an axial fifth oil passage 8052 are opened on the compressor housing 15.

[0058] The following is a preferred arrangement of the entire oil circuit: the first oil circuit 801 includes an axial first oil circuit 8011, multiple radial first oil circuits 8012, an output first oil circuit 8013, a support bearing return oil circuit 8014, and a thrust bearing return oil circuit 8015. The radial first oil circuit 8011 is arranged radially along the rotating shaft 1 for oil to enter the entire oil circuit. The inlet of the axial fifth oil circuit 8052 corresponds to the outlet of the radial fifth oil circuit 8051. The inlet of the axial first oil circuit 8011 is connected to the outlet of the axial fifth oil circuit 8052 to form a continuous oil circuit. The multiple radial first oil circuits 8012 are all connected to the axial first oil circuit 8011. The radial first oil circuit 8012 is provided with three sections, one of which is connected to the support bearing 14. The other two sections are respectively connected to the front and rear sides of the thrust bearing 13. The inlet of the output first oil passage 8013 is connected to the radial first oil passage 8012 located at the front end of the bearing body 5. The outlet is located on the end face of the bearing body 5 and in the annular cavity 10, so that the lubricating oil flows out of the axial first oil passage 8012 and directly enters the annular cavity 10. The support bearing return oil passage 8014 and the thrust bearing return oil passage 8015 are both connected to the axial first oil passage 8011. The thrust bearing return oil passage 8015 is arranged radially along the rotating shaft 1 and is located in the middle of the thrust bearing 13. The support bearing return oil passage 8014 is arranged axially inclined relative to the rotating shaft 1. The inlet of the support bearing return oil passage 8014 is connected to the rear side of the support bearing 14, and the outlet is connected to the thrust bearing return oil passage 8015. The fourth oil passage 804 is arranged at an angle relative to the radial direction of the rotating shaft 1, with its inlet facing the outlet of the first oil passage 8012. The second oil passage 802 is arranged radially along the rotating shaft 1, with its inlet corresponding to the outlet of the fourth oil passage 804. The outlet of the second oil passage 802 is located at the center of the ring liner 9. After the lubricating oil is discharged from the outlet of the second oil passage 802, it flows to both ends of the ring liner 9. The lubricating oil flowing toward the front end of the ring liner 9 enters the transition cavity 7 formed by the damping ring housing 3, the blind hole on the end face of the shaft head 11, and the damping ring 2. It then flows out through the third oil passage 803 into the gap between the rotating shaft 1 and the bearing body 5. The lubricating oil flowing toward the rear end of the ring liner 9 directly enters the gap between the rotating shaft 1 and the bearing body 5. The third oil passage 803 is radially inclined relative to the shaft 1 and positioned closer to the bottom of the blind hole on the end face of the shaft head 11 than the second oil passage 802. The gaps between the ends of the ring liner 9 and the shaft head 1 are equal in width, and the gaps between the ends of the ring liner 9 and the shaft head 11 are smaller than the gap between the middle portion of the ring liner 9 and the shaft head 11. The cross-section of the ring liner 9 is gate-shaped. In other embodiments of the present invention, the specific configuration of each oil passage, such as shape and path, can be adjusted as needed, as long as the lubricating oil can reach the ring liner 9 and form an oil film on the end of the shaft 1 during high-speed rotor rotation, providing support for the rotor and reducing rotor vibration.

[0059] The above-mentioned oil circuit is arranged in such a manner that the oil that forms a liquid film by entering the ring liner 9 can be shared with the oil in the thrust bearing 13 and the support bearing 14, which is more convenient for oil circuit design. The oil flows from the axial first oil circuit 8011 through multiple sections of radial first oil circuits 8012, flows through the thrust bearing 13 and the support bearing 14 respectively, and then returns to the axial first oil circuit 8011 through the thrust bearing return oil circuit 8015 and the support bearing return oil circuit 8014.

[0060] If the bearing body 5 is a split structure including an upper bearing body 501 and a lower bearing body 502, the axial first oil circuit 8011, the multi-section radial first oil circuit 8012, the output first oil circuit 8013, the support bearing return oil circuit 8014 and the thrust bearing return oil circuit 8015 are all opened on the lower bearing body 502.

[0061] In order to make the transition cavity 7 where the blind hole on the end face of the shaft head 11 is located have a certain gathering effect on the oil, the blind hole on the end face of the shaft head 11 can be made smaller in diameter at both ends of the shaft 1 along the axial direction than in the middle. Figure 1 As shown, the side walls of the blind hole are sloped at both ends, and can also be made into arc shapes at both ends.

[0062] In addition, two O-rings 4 are provided between the damping ring housing 3 and the damping ring 2. The two O-rings 4 are respectively located at the two ends of the damping ring 2, and the inlet of the second oil circuit 802 is located between the two O-rings 4 to prevent the lubricating oil from flowing out from the bypass. The number and specific shape of the O-rings 4 can be adjusted according to actual conditions. Only one preferred solution is shown in this embodiment.

[0063] To effectively drain the lubricating oil from the transition cavity 7 formed by the damping ring housing 3, the blind hole on the end face of the shaft head 11, and the damping ring 2, and ensure its full effectiveness, the oil passages gradually decrease in diameter from the first oil passage 801 to the second oil passage outlet to facilitate the formation of an oil film on the ring liner. Specifically, the inner diameters of the first oil passage 801, the fourth oil passage 804, and the second oil passage 802 gradually decrease. Furthermore, the diameter of the oil drain pipe from the transition cavity 7 outward is required to be no less than the diameter of the oil pipe within the damping ring 2, and the number of oil drain pipes from the transition cavity 7 outward is required to be greater than the number of oil pipes within the damping ring 2. Specifically, multiple second oil passages 802 and third oil passages 803 are provided, the total cross-sectional area of ​​the multiple third oil passages 803 being greater than or equal to the total cross-sectional area of ​​the multiple second oil passages 802, and the ratio of the number of third oil passages 803 to the number of second oil passages 802 being 1.2-2. The number of each oil passage can be one or more, both of which are reasonable adjustments made in accordance with the present invention.

[0064] In addition, the rotor with a damping structure of the present invention can also be applied to any other high-speed rotating shaft. In other application environments, the shaft can be replaced with the aforementioned rotating shaft 1 for application, and the vibration of the high-speed rotating shaft can be effectively reduced. Accordingly, the bearing body 5 can be replaced with other structures corresponding to the shaft, and even the thrust bearing 13 and the support bearing 14 can also be adjusted accordingly, and the opening position and path of the corresponding oil circuit can be adaptively adjusted.

[0065] The compressor rotor with the damping structure of the present invention can be directly installed in a compressor and can be used to manufacture new compressors or to retrofit existing compressors to adapt to high-speed development. During high-speed rotation of the rotor, an oil film forms on the ring liner 9 of the damping ring 2, providing auxiliary support, increasing structural constraints, and limiting vibration amplitude, thereby achieving rotor dynamic design that meets higher requirements.

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor with a damping structure, comprising a rotating shaft (1) and a bearing body (5) arranged outside the rotating shaft (1), characterized in that: It comprises a damping ring (2) and a damping ring housing (3); A blind hole is provided in the middle of the end face of the shaft head (11) of the rotating shaft (1); the shaft end (12) of the rotating shaft (1) is detachably connected to the shaft head (11); a thrust bearing (13) is provided on the outside of the shaft end (12); a bearing body (5) is provided on the outside of the thrust bearing (13), and a gap is left between the bearing body (5) and the rotating shaft (1); A ring liner (9) is provided inside the damping ring (2), and the ring liner (9) is sleeved on the outside of the shaft head (11), with a gap left between the ring liner (9) and the shaft head (11); The damping ring housing (3) is arranged outside the damping ring (2), and the damping ring housing (3) is fixedly connected to the bearing body (5) and is used to press the damping ring (2) onto the end face of the bearing body (5); the damping ring housing (3), the blind hole on the end face of the shaft head (11) and the damping ring (2) form a transition cavity (7); A first oil circuit (801) is provided in the bearing body (5), a second oil circuit (802) is provided in the damping ring (2), and a third oil circuit (803) is provided on the side wall of the blind hole on the end face of the shaft head (11); the first oil circuit (801), the second oil circuit (802), and the third oil circuit (803) are connected, the inlet of the first oil circuit (801) is used for the entry of lubricating oil, the outlet of the third oil circuit (803) is connected to the gap between the shaft head (11) and the bearing body (5), and the outlet of the second oil circuit (802) is located at the ring liner (9).

2. A rotor with a damping structure according to claim 1, characterized in that: An annular cavity (10) is provided inside the damping ring housing (3); A fourth oil circuit (804) is provided in the damping ring housing (3) located on the side of the annular cavity (10) close to the shaft head (11), and the first oil circuit (801), the annular cavity (10), the fourth oil circuit (804) and the second oil circuit (802) are connected in sequence.

3. A rotor with a damping structure as claimed in claim 2, characterized in that: The inner diameters of the first oil passage (801), the fourth oil passage (804) and the second oil passage (802) gradually decrease; The second oil passage (802) and the third oil passage (803) are both provided with a plurality of them; The sum of the cross-sectional areas of the plurality of third oil passages (803) is greater than or equal to the sum of the cross-sectional areas of the plurality of second oil passages (802).

4. A rotor with a damping structure as claimed in claim 3, characterized in that: The fourth oil passage (804) is arranged radially and tilted relative to the rotating shaft (1), and the inlet of the fourth oil passage (804) faces the outlet of the first oil passage (801); The second oil passage (802) is arranged radially along the rotating shaft (1), and the inlet of the second oil passage (802) corresponds to the outlet of the fourth oil passage (804); The third oil passage (803) is arranged radially and tilted relative to the rotating shaft (1), and is arranged near the bottom of the blind hole on the end face of the shaft head (11) relative to the second oil passage (802); The gap widths between the two ends of the ring liner (9) and the shaft head (11) are equal, and the gap widths between the two ends of the ring liner (9) and the shaft head (11) are smaller than the gap width between the middle of the ring liner (9) and the shaft head (11).

5. A rotor with a damping structure as claimed in claim 4, characterized in that: The blind hole on the end face of the shaft head (11) has a hole diameter at both ends of the shaft (1) along the axial direction that is smaller than the hole diameter in the middle thereof; Two O-rings (4) are provided between the damping ring housing (3) and the damping ring (2), the two O-rings (4) are respectively located at two ends of the damping ring (2), and the inlet of the second oil circuit (802) is located between the two O-rings (4); The end surface of the bearing body (5) is in a step-like shape, and the step surface close to the rotating shaft (1) is lower than the step surface away from the rotating shaft (1), and the two step surfaces are connected by a transition surface; The damping ring (2) is pressed against the step surface of the end face of the bearing body (5) close to the rotating shaft (1); the damping ring housing (3) located on the side of the annular cavity (10) close to the rotating shaft (1) is located between the transition surface between the two step surfaces of the end face of the bearing body (5) and the damping ring (2); The ring liner (9) is welded inside the damping ring (2).

6. A compressor with a damping structure, comprising a compressor housing (15), characterized in that: It also includes a rotor with a damping structure as claimed in any one of claims 1 to 5, which is arranged in a compressor housing (15); A support bearing (14) is provided on the outside of the rotating shaft (1) and located behind the thrust bearing (13).

7. A compressor with a damping structure according to claim 6, characterized in that: The first oil passage (801) is communicated with the thrust bearing (13) and the support bearing (14) respectively.

8. A compressor with a damping structure according to claim 7, characterized in that: The first oil circuit (801) includes an axial first oil circuit (8011), multiple radial first oil circuits (8012), an output first oil circuit (8013), a support bearing return oil circuit (8014), and a thrust bearing return oil circuit (8015); The compressor housing (15) is provided with a radial fifth oil passage (8051) and an axial fifth oil passage (8052); The inlet of the fifth axial oil passage (8052) corresponds to the outlet of the fifth radial oil passage (8051), and the inlet of the fifth radial oil passage (8051) is used for the entry of lubricating oil; The inlet of the axial first oil circuit (8011) is connected to the outlet of the axial fifth oil circuit (8052); the multiple sections of the radial first oil circuit (8012) are all connected to the axial first oil circuit (8011) and are respectively connected to the thrust bearing (13) and the support bearing (14); The inlet of the first output oil passage (8013) is connected to the radial first oil passage (8012) located at the front end of the bearing body (5), and the outlet is communicated with the annular cavity (10); The support bearing return oil circuit (8014) and the thrust bearing return oil circuit (8015) are both connected to the axial first oil circuit (8011).

9. The compressor with a damping structure according to claim 8, characterized in that: The radial first oil passage (8012) is provided with three sections, one section is connected to the support bearing (14), and the other two sections are respectively connected to the front side and the rear side of the thrust bearing (13); The thrust bearing return oil passage (8015) is arranged radially along the rotating shaft (1) and is located in the middle of the thrust bearing (13); The support bearing return oil passage (8014) is arranged axially tilted relative to the rotating shaft (1); The inlet of the support bearing return oil circuit (8014) is connected to the rear side of the support bearing (14), and the outlet is connected to the thrust bearing return oil circuit (8015).

10. The compressor with a damping structure according to claim 9, characterized in that: The bearing body (5) comprises an upper bearing body (501) and a lower bearing body (502) that are engaged with each other; The axial first oil circuit (8011), the multi-section radial first oil circuit (8012), the output first oil circuit (8013), the support bearing return oil circuit (8014) and the thrust bearing return oil circuit (8015) are all provided on the lower bearing body (502); The shaft end (12) and the thrust bearing (13) are an integrated structure.

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