Composite bearing, rotor assembly and compressor
By designing the radial bearing, axial bearing part and lubricating oil circuit of the composite bearing, the problem that conventional composite bearings cannot withstand high temperatures in high temperature environments is solved, effective lubrication and cooling are achieved, and the service life of the bearing is extended.
Patent Information
- Application Number
- CN202422201115.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The axial bearing surface of conventional composite bearings is difficult to withstand high temperature in a high temperature environment, resulting in severe wear and affecting the normal operation of the compressor.
A composite bearing is designed, including a radial bearing part and an axial bearing part, and is equipped with a lubricating oil path to deliver lubricating oil to the radial bearing surface and the axial bearing surface, reducing temperature and reducing wear.
It effectively solves the wear problem of the axial bearing surface of composite bearings in high-temperature environments, extends the service life of the bearing and ensures the normal operation of the compressor.
Smart Images
Figure CN222963176U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of compressors, and particularly to a composite bearing, a rotor assembly and a compressor. Background Art
[0002] In the related art, compared with conventional refrigeration compressors, the operating conditions of centrifugal heat pump compressors are more complex, and the internal temperature of the compressor is higher, which poses strict requirements on some key components such as composite bearings and motor bearings. Conventional centrifugal refrigeration compressors usually adopt composite bearings to radially bear the gravity of the shafting and axially bear the axial force of the shafting to ensure the reliable operation of the shafting. However, in a centrifugal heat pump compressor, the temperature at the impeller outlet can reach 120 °C or even higher, resulting in the composite bearing near the impeller position needing to bear the high temperature transmitted by the impeller. Especially the axial bearing surface of the composite bearing, so higher requirements are imposed on the material of the axial bearing surface of the composite bearing to ensure the normal operation of the compressor. However, the conventional bearing surface material is difficult to withstand such high temperatures, which will cause serious wear of the bearing surface under the action of high temperature, and problems such as abnormal operation of the compressor will occur.
[0003] The above statements are only used to provide background technical information related to the present application, and do not necessarily constitute prior art. Summary of the Utility Model
[0004] The purpose of the present application is to provide a composite bearing, a rotor assembly and a compressor, aiming to solve the problem that the axial bearing surface of a conventional composite bearing is difficult to withstand high temperatures when the operating temperature in the rotating mechanism where it is located is relatively high.
[0005] The first aspect of the present application provides a composite bearing, comprising:
[0006] A radial bearing portion located on the radial inner side of the composite bearing, and the radial inner surface of the radial bearing portion includes a radial bearing surface for bearing the gravity of the rotating shaft; and
[0007] Two axial bearing portions respectively located at the first axial end and the second axial end of the composite bearing, and the axial bearing portion includes an axial bearing surface axially located on the outer end surface of the axial bearing portion.
[0008] In the composite bearing of some embodiments, the composite bearing further includes a lubricating oil path, the lubricating oil path includes an oil inlet and an oil drain port, and the lubricating oil path is configured to supply lubricating oil to the radial bearing surface and the two axial bearing surfaces.
[0009] In the composite bearing of some embodiments, the lubricating oil path includes:
[0010] A first oil path configured to supply lubricating oil to the radial bearing surface; and
[0011] Two second oil passages, configured to respectively convey lubricating oil to the two axial bearing surfaces;
[0012] Wherein, the first oil passage and the two second oil passages are both directly communicated with the oil inlet, and / or the first oil passage is communicated with the oil discharge port through at least one of the two second oil passages.
[0013] In the composite bearing of some embodiments, the first oil passage includes:
[0014] A radial oil hole, the first end of which is communicated with the oil inlet;
[0015] A circumferential oil groove, located on the radial inner surface of the radial bearing portion and recessed radially outward relative to the radial bearing surface, the second end of the radial oil hole is communicated with the circumferential oil groove; and
[0016] An axial oil groove, located on the radial inner surface of the radial bearing portion and recessed radially outward relative to the radial bearing surface, the axial oil groove is communicated with the circumferential oil groove.
[0017] In the composite bearing of some embodiments, the circumferential oil groove is located at the axial middle of the radial inner surface of the radial bearing portion, and the axial oil groove intersects with the circumferential oil groove and is communicated with the circumferential oil groove at the intersection.
[0018] In the composite bearing of some embodiments,
[0019] The cross-section of the circumferential oil groove is square, U-shaped, arc-shaped, trapezoidal or triangular; and / or
[0020] The cross-section of the axial oil groove is triangular, square, U-shaped, arc-shaped or trapezoidal.
[0021] In the composite bearing of some embodiments,
[0022] The first oil passage includes a plurality of the axial oil grooves uniformly distributed in the circumferential direction; and / or
[0023] The axial two ends of the axial oil groove are respectively communicated with the outer end faces of the two axial bearing portions.
[0024] In the composite bearing of some embodiments,
[0025] The first oil passage (231) further includes two diameter-expanded portions respectively located at the axial two ends of the composite bearing, the diameter-expanded portions are configured to communicate the axial oil groove with the outer end face of the corresponding axial bearing portion at one end, and the diameter of the diameter-expanded portion is greater than the diameter of the radial inner surface of the radial bearing portion.
[0026] In the composite bearing of some embodiments, the second oil passage includes:
[0027] an axial oil hole, a first end of the axial oil hole communicating with the oil inlet; and
[0028] a radial oil groove, the radial oil groove being located on the axial bearing portion and recessed axially inward relative to the axial bearing surface, a second end of the axial oil hole communicating with the radial oil groove.
[0029] In the composite bearing of some embodiments, the axial oil hole includes:
[0030] a first axial oil hole section, a first end of the first axial oil hole section communicating with the oil inlet; and
[0031] a second axial oil hole section, a first end of the second axial oil hole section being connected to a second end of the first axial oil hole section, a second end of the second axial oil hole section communicating with the radial oil groove, a diameter of the second axial oil hole section being greater than a diameter of the first axial oil hole section.
[0032] In the composite bearing of some embodiments, the oil drain port communicates with the radial oil groove and is located radially outside the radial oil groove.
[0033] In the composite bearing of some embodiments, a width of the oil drain port is less than a width of the radial oil groove, and a depth of the oil drain port is less than a depth of the radial oil groove.
[0034] In the composite bearing of some embodiments
[0035] the second oil path includes a plurality of the axial oil holes uniformly distributed in the circumferential direction and a plurality of the radial oil grooves corresponding to the plurality of axial oil holes one by one; and / or
[0036] the axial bearing surface includes an inclined surface, the inclined surface being inclined axially outward from one side edge of the radial oil groove along a rotation direction of a rotating shaft (1) carried by the composite bearing (2) to a side away from the radial oil groove in the circumferential direction.
[0037] In the composite bearing of some embodiments, the composite bearing is arranged in sections along the axial direction.
[0038] The second aspect of the present application provides a rotor assembly, including:
[0039] a rotating shaft; and
[0040] the composite bearing according to the first aspect of the present application, the rotating shaft being supported on the composite bearing, the radial support surface of the composite bearing being configured to bear the gravity of the rotating shaft, and the two axial bearing surfaces being configured to bear the axial thrust of the rotating shaft.
[0041] In the rotor assembly of some embodiments
[0042] The rotating shaft includes a thrust section located at the end of the rotating shaft and a tail support section connected to the thrust section. The diameter of the thrust section is larger than that of the tail support section, and it has a first thrust surface facing the side of the tail support section.
[0043] The tail support section of the rotating shaft is supported on the radial bearing surface, and one of the two axial bearing surfaces is opposite to and cooperates with the first thrust surface.
[0044] The rotor assembly further includes a stop member. The stop member is installed at one end of the tail support section away from the thrust section, and it has a second thrust surface spaced apart from and opposite to the first thrust surface. The other of the two axial bearing surfaces is opposite to and cooperates with the second thrust surface.
[0045] In the rotor assembly of some embodiments, the composite bearing further includes a lubricating oil passage. The lubricating oil passage is configured to supply lubricating oil to the radial bearing surface and the two axial bearing surfaces. The lubricating oil passage has an oil inlet and an oil drain port. The rotor assembly further includes:
[0046] An end cover, including a composite bearing installation portion, an oil inlet passage, and an oil drain passage. The composite bearing is located within the composite bearing installation portion. The oil inlet passage and the oil drain passage are respectively communicated with the oil inlet and the oil drain port of the lubricating oil passage; and
[0047] A seal. The seal is located radially outside the thrust section and is configured to seal the oil inlet passage and the oil drain passage to prevent the lubricating oil from leaking from the radial outside of the thrust section or one end of the end cover facing the thrust section.
[0048] In the rotor assembly of some embodiments, the rotor assembly further includes:
[0049] A compression section, configured to compress gaseous working medium, and the compression section is connected to the rotating shaft; and
[0050] An electric motor, configured to drive the rotating shaft to rotate, arranged side by side with the compression section along the axial direction of the rotating shaft. The composite bearing is located at one end of the electric motor away from the compression section.
[0051] The third aspect of the present application provides a compressor, including the composite bearing described in the first aspect of the present application or the rotor assembly described in the second aspect of the present application.
[0052] In the compressor of some embodiments, the compressor is a centrifugal heat pump compressor.
[0053] Based on the composite bearing provided by the present application, the use of this composite bearing can simultaneously achieve radial support for the rotating shaft and bidirectional support along the axial direction. Therefore, by installing this composite bearing at a relatively low-temperature position of a rotating machine using this composite bearing, such as on the side of the motor away from the compression part of a compressor, bidirectional support of the rotating shaft along the axial direction can be simultaneously achieved. Thus, at a relatively high-temperature position of the compressor, such as near the compression part of the compressor, there is no need to additionally provide a thrust bearing or a composite bearing that can bear both radial and axial forces, which helps to solve the problem that the axial bearing surface of a conventional composite bearing is difficult to withstand high temperatures at a relatively high operating temperature position.
[0054] Through the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings, other features and advantages of the present application will become clear. BRIEF DESCRIPTION OF THE DRAWINGS
[0055] The accompanying drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:
[0056] Figure 1 It is a schematic structural diagram of a rotor assembly according to an embodiment of the present application.
[0057] Figure 2 It is a cross-sectional structural diagram of a composite bearing according to an embodiment of the present application.
[0058] Figure 3 is Figure 2 An axial structural diagram of the composite bearing of the illustrated embodiment.
[0059] Figures 1 to 3 In the drawings, each reference numeral represents respectively:
[0060] 1, rotating shaft;
[0061] 11, thrust section;
[0062] 11A, first thrust surface;
[0063] 12, tail support section;
[0064] 2, composite bearing;
[0065] 21, radial bearing part;
[0066] 211, radial inner surface;
[0067] 211A, radial bearing surface;
[0068] 22, axial bearing part;
[0069] 221, outer end face;
[0070] 221A, Axial bearing surface;
[0071] 221A1, Inclined surface;
[0072] 23, Lubricating oil path;
[0073] 23A, Oil inlet;
[0074] 23B, Oil drain port;
[0075] 231, First oil path;
[0076] 2311, Radial oil hole;
[0077] 2312, Circumferential oil groove;
[0078] 2313, Axial oil groove;
[0079] 2314, Diameter-expanded part;
[0080] 232, Second oil path;
[0081] 2321, Axial oil hole;
[0082] 23211, First axial oil hole section;
[0083] 23212, Second axial oil hole section;
[0084] 2322, Radial oil groove;
[0085] 3, Stop member;
[0086] 3A, Second thrust surface;
[0087] 4, End cover;
[0088] 41, Composite bearing installation part;
[0089] 42, Oil inlet path;
[0090] 43, Oil drain path;
[0091] 5, Sealing member. Detailed implementation manners
[0092] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.
[0093] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, 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 drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0094] In the description of the present application, it should be understood that the use of terms such as "first" and "second" to limit components is merely for the convenience of distinguishing the corresponding components. Without otherwise stating, the above terms have no special meanings, and thus, should not be construed as limiting the protection scope of the present application.
[0095] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the orientation terms is generally based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, should not be construed as limiting the protection scope of the present application; the orientation terms "inside" and "outside" refer to the inside and outside relative to the contour of each component itself.
[0096] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0097] In the following description, the so-called "radial", "axial", and "circumferential" refer to the radial, axial, and circumferential directions of the composite bearing and the compressor in which the composite bearing is located.
[0098] As Figures 1 to 3 shown, an embodiment of the present application provides a composite bearing 2, including a radial bearing portion 21 and two axial bearing portions 22.
[0099] The radial bearing portion 21 is located on the radial inner side of the composite bearing 2. The radial inner surface 211 of the radial bearing portion 21 includes a radial bearing surface 211A for bearing the gravity of the rotating shaft 1.
[0100] The two axial bearing portions 22 are respectively located at the first axial end and the second axial end of the composite bearing 2. The axial bearing portion 22 includes an axial bearing surface 221A axially located on the outer end face 221 of the axial bearing portion 22.
[0101] Based on the composite bearing 2 provided by the embodiments of the present application, by using the composite bearing 2, radial support for the rotating shaft 1 and bidirectional support along the axis can be achieved simultaneously. Thus, by installing the composite bearing 2 at a relatively low-temperature position of a rotating machine using the composite bearing 2, such as on the side of the motor far from the compression portion of a compressor, bidirectional support of the rotating shaft 1 along the axis can be achieved simultaneously. Therefore, at a relatively high-temperature position of the compressor, such as near the compression portion of the compressor, there is no need to additionally provide a thrust bearing or a composite bearing that can bear both radial force and axial force, which helps to solve the problem that the axial bearing surface of a conventional composite bearing is difficult to withstand high temperature at a relatively high working temperature position.
[0102] As Figure 1 and Figure 2 As shown, in the composite bearing 2 of some embodiments, the composite bearing 2 further includes a lubricating oil path 23. The lubricating oil path 23 includes an oil inlet 23A and an oil drain port 23B. The lubricating oil path 23 is configured to supply lubricating oil to the radial bearing surface 211A and the two axial bearing surfaces 221A.
[0103] By supplying lubricating oil to the radial bearing surface 211A and the two axial bearing surfaces 221A through the lubricating oil path 23, each bearing surface of the composite bearing 2 can be lubricated and cooled, effectively preventing the heat of high-temperature components such as high-temperature impellers from being transferred to the bearing surfaces of the composite bearing 2 that support the rotating shaft 1, which helps to prevent the composite bearing 2 from failing due to excessive temperature.
[0104] As Figure 1 and Figure 2 As shown, in the composite bearing 2 of some embodiments, the lubricating oil path 23 includes a first oil path 231 and two second oil paths 232. The first oil path 231 is configured to supply lubricating oil to the radial bearing surface 211A. The two second oil paths 232 are configured to supply lubricating oil to the two axial bearing surfaces 221A respectively. The first oil path 231 and the two second oil paths 232 are both directly connected to the oil inlet 23A, and / or the first oil path 231 is connected to the oil drain port 23B through at least one of the two second oil paths 232.
[0105] The above settings can enable the lubricating oil leading to each bearing surface to enter and exit the lubricating oil path 23 through the same oil inlet 23A and / or oil drain port 23B, which is beneficial for the control and distribution of the total amount of lubricating oil and also helps to simplify the lubricating oil path.
[0106] As Figure 1 and Figure 2As shown, in the composite bearing 2 of some embodiments, the first oil passage 231 includes a radial oil hole 2311, a circumferential oil groove 2312, and an axial oil groove 2313. The first end of the radial oil hole 2311 communicates with the oil inlet 23A. The circumferential oil groove 2312 is located on the radially inner surface 211 of the radial bearing portion 21 and is recessed radially outward relative to the radial bearing surface 211A. The second end of the radial oil hole 2311 communicates with the circumferential oil groove 2312. The axial oil groove 2313 is located on the radially inner surface 211 of the radial bearing portion 21 and is recessed radially outward relative to the radial bearing surface 211A. The axial oil groove 2313 communicates with the circumferential oil groove 2312.
[0107] The first oil passage 231 includes a radial oil hole 2311, a circumferential oil groove 2312, and an axial oil groove 2313, which is conducive to the uniform distribution of lubricating oil along the radial bearing surface 211A, thereby having a better lubricating and cooling effect on the radial bearing portion 21.
[0108] As Figure 1 and Figure 2 shown, in the composite bearing 2 of some embodiments, the circumferential oil groove 2312 is located at the axial middle of the radially inner surface 211 of the radial bearing portion 21, and the axial oil groove 2313 intersects with the circumferential oil groove 2312 and communicates with the circumferential oil groove 2312 at the intersection.
[0109] The set positions and connection modes of the circumferential oil groove 2312 and the axial oil groove 2313 are conducive to the uniform distribution of lubricating oil along the radial bearing surface 211A, thereby having a better lubricating and cooling effect on the radial bearing portion 21.
[0110] As Figures 1 to 3 shown, in the composite bearing 2 of some embodiments, the cross-section of the circumferential oil groove 2312 is square, U-shaped, arc-shaped, trapezoidal or triangular; and / or the cross-section of the axial oil groove 2313 is triangular, square, U-shaped, arc-shaped or trapezoidal.
[0111] As Figures 1 to 3 shown, in the composite bearing 2 of some embodiments, the first oil passage 231 includes a plurality of axial oil grooves 2313 uniformly distributed in the circumferential direction; and / or the two axial ends of the axial oil groove 2313 communicate with the outer end faces 221 of the two axial bearing portions 22 respectively.
[0112] The first oil passage 231 includes a plurality of axial oil grooves 2313 uniformly distributed in the circumferential direction, which is conducive to the uniform distribution of lubricating oil along the radial bearing surface 211A, thereby having a better lubricating effect on the radial bearing portion 21; the two axial ends of the axial oil groove 2313 communicate with the outer end faces 221 of the two axial bearing portions 22 respectively, which is conducive to balancing the lubricating oil quantity and lubricating pressure of the radial bearing surface 211A and the axial bearing surface 221A.
[0113] AsFigures 1 to 3 As shown in Figures 1 to 3 , in the composite bearing 2 of some embodiments, the first oil passage 231 further includes two enlarged diameter portions 2314 respectively located at the axial two ends of the composite bearing 2. The enlarged diameter portion 2314 is configured to communicate the axial oil groove 2313 with the outer end face 221 of the axial bearing portion 22 at the corresponding end. The diameter of the enlarged diameter portion 2314 is greater than the diameter of the radially inner surface 211 of the radial bearing portion 21.
[0114] Through the enlarged diameter portion 2314, the two axial ends of the axial oil groove 2313 can be respectively communicated with the outer end faces 221 of the two axial bearing portions 22, which is beneficial to balancing the lubricating oil quantity and lubricating pressure of the radial bearing surface 211A and the axial bearing surface 221A.
[0115] As Figures 1 to 3 shown in Figures 1 to 3 , in the composite bearing 2 of some embodiments, the second oil passage 232 includes an axial oil hole 2321 and a radial oil groove 2322. The first end of the axial oil hole 2321 is communicated with the oil inlet 23A. The radial oil groove 2322 is located on the axial bearing portion 22 and is recessed axially inward relative to the axial bearing surface 221A. The second end of the axial oil hole 2321 is communicated with the radial oil groove 2322.
[0116] By providing the axial oil hole 2321, the lubricating oil can be led to the outer end face 211, and by providing the radial oil groove 2322, it is beneficial to the uniform distribution of the lubricating oil on the axial bearing surface 211A.
[0117] As Figures 1 to 3 shown in Figures 1 to 3 , in the composite bearing 2 of some embodiments, the axial oil hole 2321 includes a first axial oil hole section 23211 and a second axial oil hole section 23212. The first end of the first axial oil hole section 23211 is communicated with the oil inlet 23A. The first end of the second axial oil hole section 23212 is connected to the second end of the first axial oil hole section 23211, and the second end of the second axial oil hole section 23212 is communicated with the radial oil groove 2322. The diameter of the second axial oil hole section 23212 (such as Figure 2 D2 and D3 in Figure 2 ) is greater than the diameter of the first axial oil hole section 23211 (such as Figure 2 D1 in Figure 2 ).
[0118] By providing the first axial oil hole section 23211 and the second axial oil hole section 23212 with different diameters, it is beneficial to ensure the normal oil supply amount of the two axial bearing surfaces of the composite bearing.
[0119] As Figures 1 to 3 shown in Figures 1 to 3 , in the composite bearing 2 of some embodiments, the oil drain port 23B is communicated with the radial oil groove 2322 and is located radially outside the radial oil groove 2322.
[0120] Connect the oil drain port 23B to the radial oil groove 2322, which is conducive to the distribution of lubricating oil on the axial bearing surface 221A and then flowing out from the composite bearing 2, preventing the lubricating oil from accumulating in the radial oil groove 2322, unable to flow normally and unable to carry away heat, thereby facilitating the full lubrication and cooling of the axial bearing surface 221A of the composite bearing 2.
[0121] As Figures 1 to 3 shown, in the composite bearing 2 of some embodiments, the width of the oil drain port 23B is smaller than the width of the radial oil groove 2322, and the depth of the oil drain port 23B is smaller than the depth of the radial oil groove 2322.
[0122] The above settings of the width and depth of the oil drain port 23B are conducive to the reasonable oil storage in the radial oil groove 2322, establishing an appropriate lubricating oil pressure, ensuring the oil storage amount required for the normal operation of the composite bearing 2, enabling the heat generated by the operation of the composite bearing 2 to be transferred to the lubricating oil in time and carried away in time, so as to prevent the axial bearing surface 221A and the radial bearing surface 211A of the composite bearing 2 from being insufficiently lubricated and cooled.
[0123] As Figure 3 shown, in the composite bearing 2 of some embodiments, the second oil passage 232 includes a plurality of axial oil holes 2321 evenly distributed in the circumferential direction and a plurality of radial oil grooves 2322 corresponding to the plurality of axial oil holes 2321 one by one; and / or the axial bearing surface 221A includes an inclined surface 221A1, and the inclined surface 221A1 is inclined axially outward from one side edge of the radial oil groove 2322 along the circumferential direction in the rotation direction of the rotating shaft 1 carried by the composite bearing 2 to the side far from the radial oil groove 2322.
[0124] Setting a plurality of axial oil holes 2321 and a plurality of radial oil grooves 2322 corresponding to the plurality of axial oil holes 2321 one by one is conducive to the uniform distribution of lubricating oil on the axial bearing surface 221A; setting the inclined surface 221A1 is conducive to the uniform distribution of lubricating oil on the axial bearing surface 221A as the rotating shaft 1 rotates.
[0125] As Figure 1 and Figure 2 shown, in the composite bearing 2 of some embodiments, the composite bearing 2 is arranged in sections along the axial direction.
[0126] The composite bearing 2 being arranged in sections along the axial direction is conducive to processing and assembling with other components of the rotor assembly.
[0127] As Figure 1 shown, the embodiment of the present application further provides a rotor assembly, including a rotating shaft 1 and the composite bearing 2 of the embodiment of the present application. The rotating shaft 1 is supported on the composite bearing 2, the radial supporting surface of the composite bearing 2 is configured to bear the gravity of the rotating shaft 1, and the two axial bearing surfaces 221A are configured to bear the axial thrust of the rotating shaft 1.
[0128] The rotor assembly of the embodiment of the present application has the advantages that the rotating shaft 1 of the embodiment of the present application has.
[0129] As Figure 1 shown, in the rotor assembly of some embodiments, the rotating shaft 1 includes a thrust section 11 located at the end of the rotating shaft 1 and a tail support section 12 connected to the thrust section 11. The diameter of the thrust section 11 is larger than that of the tail support section 12, and it has a first thrust surface 11A facing the tail support section 12. The tail support section 12 of the rotating shaft 1 is supported on the radial bearing surface 211A, and one of the two axial bearing surfaces 221A is opposite to and cooperates with the first thrust surface 11A. The rotor assembly further includes a stopper 3, and the stopper 3 is installed at one end of the tail support section 12 away from the thrust section 11, and has a second thrust surface 3A spaced from and opposite to the first thrust surface 11A, and the other of the two axial bearing surfaces 221A is opposite to and cooperates with the second thrust surface 3A.
[0130] Through the settings of the thrust section 11, the tail support section 12 and the stopper 3, the composite bearing 2 is installed on the tail support section 12 between the thrust section 11 and the stopper 3, which can make the bearing surfaces of the composite bearing 2 cooperate with the rotating part of the rotor assembly, so as to realize the radial support and the two-way axial support of the rotating shaft 2.
[0131] As Figure 1 shown, in the rotor assembly of some embodiments, the composite bearing 2 further includes a lubricating oil passage 23, and the lubricating oil passage 23 is configured to deliver lubricating oil to the radial bearing surface 211A and the two axial bearing surfaces 221A. The lubricating oil passage 23 has an oil inlet 23A and an oil drain port 23B. The rotor assembly further includes an end cover 4 and a seal 5. The end cover 4 includes a composite bearing installation part 41, an oil inlet passage 42 and an oil drain passage 43. The composite bearing 2 is located in the composite bearing installation part 41, and the oil inlet passage 42 and the oil drain passage 43 are respectively communicated with the oil inlet 23A and the oil drain port 23B of the lubricating oil passage 23. The seal 5 is located on the radial outer side of the thrust section 11 and is configured to seal the oil inlet passage 42 and the oil drain passage 43 to prevent the lubricating oil from leaking from the radial outer side of the thrust section 11 or the end of the end cover 4 facing the thrust section 11.
[0132] By setting the end cover 4 and the seal 5, the oil inlet and oil drain of the lubricating oil passage 23 can be ensured, which is beneficial to the sufficient and stable lubrication of the composite bearing 2. The seal 5 is, for example, a comb seal.
[0133] As Figure 1 shown, in the rotor assembly of some embodiments, the rotor assembly further includes a compression part and a motor. The compression part is configured to compress the gaseous working medium, and the compression part is connected to the rotating shaft 1. The motor is configured to drive the rotating shaft 1 to rotate, and is arranged side by side with the compression part along the axial direction of the rotating shaft 1. The composite bearing 2 is located at one end of the motor away from the compression part.
[0134] The composite bearing 2 is located at one end of the motor away from the compression part, so that the operating temperature at the position where the composite bearing 2 is located is relatively low, and there is no need to provide a thrust bearing or a composite bearing at other positions, such as at a high-temperature position near the compression part, which is beneficial to solving the problem that the axial bearing surface of a conventional composite bearing is difficult to withstand high temperatures at a position with a relatively high operating temperature.
[0135] The embodiment of the present application also provides a compressor, including the composite bearing 2 or the rotor assembly of the embodiment of the present application.
[0136] The compressor of the embodiment of the present application has the advantages of the composite bearing 2 or the rotor assembly of the embodiment of the present application.
[0137] In the compressor of some embodiments, the compressor is a centrifugal heat pump compressor.
[0138] The following is combined with Figures 1 to 3 to further illustrate the embodiment of the present application. Figure 1 It is a schematic structural diagram of the rotor assembly of the embodiment of the present application. Figure 2 It is a schematic cross-sectional structural diagram of the composite bearing of an embodiment of the present application. Figure 3 It is Figure 2 an axial structural diagram of the composite bearing of the illustrated embodiment. Figure 1 The arrow in
[0139] The rotor assembly includes a rotating shaft 1, the composite bearing 2 of the embodiment of the present application, a stop member 3, an end cover 4, a seal member 5, a compression part (not shown), and a motor (not shown).
[0140] The composite bearing 2 includes a radial bearing part 21 and two axial bearing parts 22, and includes a lubricating oil path 23. The radial bearing part 21 is located on the radial inner side of the composite bearing 2. The radial inner surface 211 of the radial bearing part 21 includes a radial bearing surface 211A for bearing the gravity of the rotating shaft 1. The two axial bearing parts 22 are respectively located at the axial first end and the axial second end of the composite bearing 2. The axial bearing part 22 includes an axial bearing surface 221A axially located on the outer end surface 221 of the axial bearing part 22.
[0141] The lubricating oil path 23 includes a first oil path 231 and two second oil paths 232. The first oil path 231 is configured to deliver lubricating oil to the radial bearing surface 211A. The two second oil paths 232 are configured to respectively deliver lubricating oil to the two axial bearing surfaces 221A. The first oil path 231 and the two second oil paths 232 are both directly communicated with the oil inlet 23A, and the first oil path 231 is communicated with the oil discharge port 23B through at least one of the two second oil paths 232.
[0142] The first oil passage 231 includes a radial oil hole 2311, a circumferential oil groove 2312, and a plurality of axial oil grooves 2313. The plurality of axial oil grooves 2313 are evenly distributed in the circumferential direction. The circumferential oil groove 2312 is located at the axial middle of the radial inner surface 211 of the radial bearing portion 21. The cross-section of the circumferential oil groove 2312 is square. The cross-section of the axial oil groove 2313 is triangular.
[0143] The first end of the radial oil hole 2311 communicates with the oil inlet 23A. The circumferential oil groove 2312 is located on the radial inner surface 211 of the radial bearing portion 21 and is recessed radially outward relative to the radial bearing surface 211A. The second end of the radial oil hole 2311 communicates with the circumferential oil groove 2312. The axial oil grooves 2313 are located on the radial inner surface 211 of the radial bearing portion 21 and are recessed radially outward relative to the radial bearing surface 211A. Each axial oil groove 2313 intersects with the circumferential oil groove 2312 and communicates with the circumferential oil groove 2312 at the intersection.
[0144] The first oil passage 231 further includes two enlarged diameter portions 2314 respectively located at the axial two ends of the composite bearing 2. The enlarged diameter portions 2314 are configured to communicate the axial oil grooves 2313 with the outer end faces 221 of the axial bearing portions 22 at the corresponding ends. The diameter of the enlarged diameter portions 2314 is larger than the diameter of the radial inner surface 211 of the radial bearing portion 21.
[0145] The second oil passage 232 includes a plurality of axial oil holes 2321 evenly distributed in the circumferential direction and radial oil grooves 2322 corresponding to the plurality of axial oil holes 2321 one by one. The first end of the axial oil hole 2321 communicates with the oil inlet 23A. The radial oil grooves 2322 are located on the axial bearing portions 22 and are recessed axially inward relative to the axial bearing surface 221A. The second end of the axial oil hole 2321 communicates with the corresponding radial oil groove 2322.
[0146] The axial oil hole 2321 includes a first axial oil hole section 23211 and a second axial oil hole section 23212. The first end of the first axial oil hole section 23211 communicates with the oil inlet 23A. The first end of the second axial oil hole section 23212 is connected to the second end of the first axial oil hole section 23211, and the second end of the second axial oil hole section 23212 communicates with the radial oil groove 2322. The diameter of the second axial oil hole section 23212 is larger than the diameter of the first axial oil hole section 23211.
[0147] A plurality of oil discharge ports 23B communicate with the plurality of radial oil grooves 2322 one by one. Each oil discharge port 2B is located radially outside the corresponding radial oil groove 2322. The width of the oil discharge port 23B is smaller than the width of the radial oil groove 2322, and the depth of the oil discharge port 23B is smaller than the depth of the radial oil groove 2322.
[0148] The axial bearing surface 221A includes an inclined surface 221A1 which is inclined axially outward from one side edge of the radial oil groove 2322 along the circumferential direction in the rotation direction of the rotating shaft 1 carried by the composite bearing 2 to the side away from the radial oil groove 2322.
[0149] The composite bearing 2 is axially segmented. In this embodiment, the composite bearing 2 is axially divided into two parts, and the axial bearing part 22 located on the left side in the figure is separately arranged from other parts of the composite bearing 22.
[0150] Each bearing part can be sprayed with a wear-resistant and / or low-friction material with a certain thickness to form a bearing surface, which is beneficial to preventing large friction and serious wear of the same kind of material.
[0151] The rotating shaft 1 is supported on the composite bearing 2. The radial bearing surface of the composite bearing 2 is configured to bear the gravity of the rotating shaft 1, and the two axial bearing surfaces 221A are configured to bear the axial thrust of the rotating shaft 1.
[0152] The rotating shaft 1 includes a thrust section 11 at the end of the rotating shaft 1 and a tail support section 12 connected to the thrust section 11. The diameter of the thrust section 11 is larger than that of the tail support section 12, and it has a first thrust surface 11A facing the tail support section 12. The tail support section 12 of the rotating shaft 1 is supported on the radial bearing surface 211A. One of the two axial bearing surfaces 221A is opposite to and cooperates with the first thrust surface 11A.
[0153] The stopper 3 is installed at one end of the tail support section 12 away from the thrust section 11, and has a second thrust surface 3A spaced from and opposite to the first thrust surface 11A. The other of the two axial bearing surfaces 221A is opposite to and cooperates with the second thrust surface 3A.
[0154] The end cover 4 includes a composite bearing installation part 41, an oil inlet passage 42 and an oil drain passage 43. The composite bearing 2 is located in the composite bearing installation part 41, and the oil inlet passage 42 and the oil drain passage 43 are respectively communicated with the oil inlet 23A and the oil drain port 23B of the lubricating oil passage 23.
[0155] The seal 5 is a comb seal, located radially outside the thrust section 11, and is configured to seal the oil inlet passage 42 and the oil drain passage 43 to prevent lubricating oil from leaking from the radial outside of the thrust section 11 or one end of the end cover 4 facing the thrust section 11. The teeth of the comb seal are located radially outside the thrust section 11.
[0156] The compression part is configured to compress the gaseous working medium, and the compression part is connected to the rotating shaft 1. The motor is configured to drive the rotating shaft 1 to rotate, and is arranged side by side with the compression part along the axial direction of the rotating shaft 1. The composite bearing 2 is located at one end of the motor away from the compression part.
[0157] The composite bearing 2 according to the embodiment of the present application is particularly suitable for a heat pump centrifugal compressor with a relatively high operating temperature. In a heat pump centrifugal compressor, there is a problem that the exhaust temperature of the compressor is high, and the working environment of the composite bearing at the impeller serving as the compression part is harsh. The material of the composite axial bearing surface cannot resist the high temperature inside the heat pump centrifugal compressor, resulting in bearing wear and failure, and abnormal operation of the compressor. By using the composite bearing 2 of this embodiment, the bearing at the compression part can be designed to only bear the gravity of the rotor assembly, and there is no axial contact with the rotating shaft, without bearing the axial force inside the heat pump centrifugal compressor. The bearing on the motor side uses the composite bearing 2, and the composite bearing 2 can synchronously bear the gravity of the rotor assembly and the axial force inside the heat pump centrifugal compressor. Since the composite bearing 2 is relatively far from the impeller side and has a lower temperature, it is used to bear the axial force caused by the pressure difference inside the compressor, which is beneficial to ensuring the normal operation of the heat pump centrifugal compressor.
[0158] The composite bearing 2 according to the embodiment of the present application has a simple structure itself, and the corresponding rotor assembly and compressor, such as a heat pump centrifugal compressor, also have a relatively simple structure, strong applicability, are easy to implement, and can ensure the normal operation of the composite bearing to a great extent, thereby being beneficial to improving the operation reliability of the compressor where the composite bearing 2 is located.
[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present application or perform equivalent replacements for some technical features, and all of them should be covered within the scope of the technical solutions claimed in the present application.
Claims
1. A composite bearing (2), characterized in that: include: a radial bearing portion (21) located radially inside the composite bearing (2), wherein a radial inner surface (211) of the radial bearing portion (21) comprises a radial bearing surface (211A) for bearing the gravity of the rotating shaft (1); and Two axial bearing portions (22) are respectively located at an axial first end and an axial second end of the composite bearing (2), and the axial bearing portion (22) comprises an axial bearing surface (221A) located on an outer end surface (221) of the axial bearing portion (22) along the axial direction.
2. The composite bearing (2) according to claim 1, characterized in that: It also includes a lubricating oil circuit (23), the lubricating oil circuit (23) including an oil inlet (23A) and an oil discharge port (23B), and the lubricating oil circuit (23) is configured to transport lubricating oil to the radial bearing surface (211A) and the two axial bearing surfaces (221A).
3. The composite bearing (2) according to claim 2, characterized in that: The lubricating oil circuit (23) comprises: a first oil passage (231) configured to deliver lubricating oil to the radial bearing surface (211A); and Two second oil passages (232) are configured to transport lubricating oil to the two axial bearing surfaces (221A) respectively; The first oil circuit (231) and the two second oil circuits (232) are both directly connected to the oil inlet (23A), and / or the first oil circuit (231) is connected to the oil discharge port (23B) via at least one of the two second oil circuits (232).
4. The composite bearing (2) according to claim 3, characterized in that: The first oil circuit (231) comprises: a radial oil hole (2311), wherein a first end of the radial oil hole (2311) is in communication with the oil inlet (23A); an annular oil groove (2312), located on the radial inner surface (211) of the radial bearing portion (21) and recessed radially outward relative to the radial bearing surface (211A), the second end of the radial oil hole (2311) being in communication with the annular oil groove (2312); and An axial oil groove (2313) is located on the radial inner surface (211) of the radial bearing portion (21) and is recessed radially outward relative to the radial bearing surface (211A); the axial oil groove (2313) is connected to the annular oil groove (2312).
5. The composite bearing (2) according to claim 4, characterized in that: The annular oil groove (2312) is located in the axial middle of the radial inner surface (211) of the radial bearing portion (21), and the axial oil groove (2313) intersects with the annular oil groove (2312) and is connected to the annular oil groove (2312) at the intersection.
6. The composite bearing (2) according to claim 4, characterized in that: The cross section of the annular oil groove (2312) is square, U-shaped, arc-shaped, trapezoidal or triangular; and / or The cross-section of the axial oil groove (2313) is triangular, square, U-shaped, arc-shaped or trapezoidal.
7. The composite bearing (2) according to claim 4, characterized in that: The first oil circuit (231) comprises a plurality of axial oil grooves (2313) uniformly distributed along the circumferential direction; and / or The axial ends of the axial oil groove (2313) are respectively connected to the outer end surfaces (221) of the two axial bearing parts (22).
8. The composite bearing (2) according to claim 7, characterized in that: The first oil passage (231) further comprises two expanded diameter portions (2314) respectively located at two axial ends of the composite bearing (2); the expanded diameter portions (2314) are configured to connect the axial oil groove (2313) with an outer end surface (221) of the axial bearing portion (22) at a corresponding end; and the diameter of the expanded diameter portion (2314) is greater than the diameter of the radial inner surface (211) of the radial bearing portion (21).
9. The composite bearing (2) according to claim 3, characterized in that: The second oil circuit (232) comprises: an axial oil hole (2321), a first end of the axial oil hole (2321) being in communication with the oil inlet (23A); and A radial oil groove (2322), the radial oil groove (2322) being located on the axial bearing portion (22) and being recessed axially inward relative to the axial bearing surface (221A), and the second end of the axial oil hole (2321) being in communication with the radial oil groove (2322).
10. The composite bearing (2) according to claim 9, characterized in that: The axial oil hole (2321) comprises: a first axial oil hole section (23211), a first end of the first axial oil hole section (23211) being in communication with the oil inlet (23A); and A second axial oil hole section (23212), wherein the first end of the second axial oil hole section (23212) is connected to the second end of the first axial oil hole section (23211), the second end of the second axial oil hole section (23212) is communicated with the radial oil groove (2322), and the diameter of the second axial oil hole section (23212) is greater than the diameter of the first axial oil hole section (23211).
11. The composite bearing (2) according to claim 9, characterized in that: The oil unloading port (23B) is in communication with the radial oil groove (2322) and is located radially outside the radial oil groove (2322).
12. The composite bearing (2) according to claim 11, characterized in that: The width of the oil unloading port (23B) is smaller than the width of the radial oil groove (2322), and the depth of the oil unloading port (23B) is smaller than the depth of the radial oil groove (2322).
13. The composite bearing (2) according to claim 9, characterized in that: The second oil passage (232) comprises a plurality of axial oil holes (2321) uniformly distributed along the circumferential direction and a plurality of radial oil grooves (2322) corresponding one-to-one to the plurality of axial oil holes (2321); and / or The axial bearing surface (221A) comprises an inclined surface (221A1), wherein the inclined surface (221A1) is inclined axially outward from an edge of one side of the radial oil groove (2322) along the rotation direction of the rotating shaft (1) supported by the composite bearing (2) to a side away from the radial oil groove (2322).
14. The composite bearing (2) according to any one of claims 1 to 13, characterized in that: The composite bearing (2) is arranged in sections along the axial direction.
15. A rotor assembly, characterized in that: include: a rotating shaft (1); and According to the composite bearing (2) according to any one of claims 1 to 14, the rotating shaft (1) is supported on the composite bearing (2), the radial support surface of the composite bearing (2) is configured to bear the gravity of the rotating shaft (1), and the two axial bearing surfaces (221A) are configured to bear the axial thrust of the rotating shaft (1).
16. The rotor assembly according to claim 15, characterized in that The rotating shaft (1) comprises a thrust section (11) located at the end of the rotating shaft (1) and a tail support section (12) connected to the thrust section (11); the thrust section (11) has a diameter greater than a diameter of the tail support section (12) and has a first thrust surface (11A) facing one side of the tail support section (12); The tail support section (12) of the rotating shaft (1) is supported on the radial bearing surface (211A), and one of the two axial bearing surfaces (221A) is opposite to and matched with the first thrust surface (11A); The rotor assembly further comprises a stopper (3), the stopper (3) being mounted on an end of the tail support section (12) away from the thrust section (11), and having a second thrust surface (3A) spaced apart from and arranged opposite to the first thrust surface (11A), and the other of the two axial bearing surfaces (221A) being opposite to and matched with the second thrust surface (3A).
17. The rotor assembly according to claim 16, characterized in that The composite bearing (2) further comprises a lubricating oil circuit (23), wherein the lubricating oil circuit (23) is configured to deliver lubricating oil to the radial bearing surface (211A) and the two axial bearing surfaces (221A), and the lubricating oil circuit (23) has an oil inlet (23A) and an oil discharge port (23B). The rotor assembly further comprises: an end cover (4), comprising a composite bearing mounting portion (41), an oil inlet passage (42) and an oil discharge passage (43), wherein the composite bearing (2) is located in the composite bearing mounting portion (41), and the oil inlet passage (42) and the oil discharge passage (43) are respectively connected to the oil inlet port (23A) and the oil discharge port (23B) of the lubricating oil passage (23); and A sealing member (5) is located radially outside the thrust section (11) and is configured to seal the oil inlet passage (42) and the oil outlet passage (43) to prevent the lubricating oil from leaking from the radial outside of the thrust section (11) or from an end of the end cover (4) facing the thrust section (11).
18. A rotor assembly according to any one of claims 15 to 17, characterized in that Also includes: A compression part, configured to compress a gaseous working medium, the compression part being connected to the rotating shaft (1); and The motor is configured to drive the rotating shaft (1) to rotate, and is arranged side by side with the compression part along the axial direction of the rotating shaft (1); the composite bearing (2) is located at an end of the motor away from the compression part.
19. A compressor, characterized in that: A composite bearing (2) comprising any one of claims 1 to 14 or a rotor assembly according to any one of claims 15 to 18.
20. The compressor according to claim 19, characterized in that The compressor is a centrifugal heat pump compressor.