Rotor assemblies, compressors and air conditioners

Abstract

Embodiments of the present invention provide a rotor assembly, a compressor, and an air conditioner. The rotor assembly includes a first rotor, which includes a coaxially arranged first working portion and a second working portion. The first and second working portions are rotatable about a first axis. The first working portion includes a plurality of first spiral blades, with first blade grooves formed between adjacent first spiral blades. The first end surface of the first working portion, distal from the second working portion, is provided with at least one first air pressure groove. When the first air pressure groove rotates, it generates a force along the first axis in a predetermined direction. Embodiments of the present invention can reduce compressor costs, simplify the structure of the compressor's operating components, and improve compressor performance and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a rotor assembly, a compressor and an air conditioner. Background Art

[0002] Compressors are widely used in aerodynamics, refrigeration and air conditioning, and various process flows due to their compactness, high efficiency, reliable performance, and strong adaptability, and their market share continues to expand. The four-rotor compressor is a completely new compressor structure. Compared to traditional compressors, it features two pairs of dual-compressor rotors symmetrically arranged on the end face of the suction port. A single four-rotor compressor is equivalent to two compressors in parallel, drawing air through the central radial suction port and exhausting air through the exhaust ports at both ends. Due to the opposing, counter-rotating arrangement of the four rotors, ideally, the axial forces of the four-rotor compressor can be completely offset, completely eliminating the thrust bearing and achieving further miniaturization of the compressor.

[0003] However, differences in the actual processing and assembly of the four rotors prevent the axial forces from being completely offset during operation after they are formed. This can result in random gas axial forces in two axial directions on the compressor rotors. Therefore, two sets of thrust bearings with opposite load bearing directions are required to ensure that the two random gas axial forces are carried. For an independent compressor, the direction of the resultant random gas axial forces remains unchanged. In this case, one set of thrust bearings is used for limiting, while the other set of thrust bearings is completely idle. This results in a very low cost-effectiveness, and also results in excess mechanical losses and lubricant requirements, increasing the compressor's failure rate. Summary of the Invention

[0004] Embodiments of the present invention provide a rotor assembly, a compressor, and an air conditioner to reduce compressor cost, simplify the structure of compressor operating components, and improve compressor performance and reliability.

[0005] A first aspect of the present invention provides a rotor assembly, comprising:

[0006] The first rotor includes a first working part and a second working part arranged coaxially, and the first working part and the second working part can rotate around a first axis. The first working part includes a plurality of first spiral blades, and a first blade groove is formed between two adjacent first spiral blades. The first end surface of the first working part away from the second working part is provided with at least one first air pressure groove. When the first air pressure groove rotates, it forms a force along the first axis toward a preset direction.

[0007] In some embodiments, the at least one first air pressure groove is respectively communicated with at least one of the plurality of first leaf grooves of the first working portion.

[0008] In some embodiments, the rotor assembly further includes a second rotor including a coaxially arranged third working portion and a fourth working portion, the third working portion meshing with the first working portion, the fourth working portion meshing with the second working portion, and the third working portion and the fourth working portion can rotate about a second axis.

[0009] In some embodiments, the first end surface is provided with a wear-resistant coating.

[0010] In some embodiments, the first working part includes a plurality of first spiral leaves, the plurality of first leaf grooves are respectively adjacent to the plurality of first spiral leaves, the number of the at least one first air pressure groove is multiple, and each first spiral leaf is provided with at least one first air pressure groove.

[0011] In some embodiments, a plurality of the first air pressure grooves are distributed on the first end surface in a ring shape around the center of the first end surface.

[0012] In some embodiments, the number of the plurality of first air pressure grooves is equal to the number of the plurality of first spiral leaves, each of the plurality of first air pressure grooves is respectively opened on the end face of a different first spiral leaf, and each of the plurality of first air pressure grooves is respectively connected to a different first leaf groove.

[0013] A second aspect of the present invention provides a compressor, comprising:

[0014] a housing comprising a first inner wall; and

[0015] A rotor assembly comprising:

[0016] The first rotor includes a first working part and a second working part coaxially arranged in the shell, the first working part and the second working part can rotate around a first axis, the first working part includes a plurality of first spiral leaves, a first leaf groove is formed between two adjacent first spiral leaves, and the first end face of the first working part away from the second working part is provided with at least one first air pressure groove, the first end face is assembled with the first inner wall gap, and the first air pressure groove forms a force along the first axis toward a preset direction when rotating.

[0017] In some embodiments, the at least one first air pressure groove is respectively communicated with at least one of the plurality of first leaf grooves of the first working portion.

[0018] In some embodiments, the rotor assembly further includes a second rotor including a coaxially arranged third working portion and a fourth working portion, the third working portion meshing with the first working portion, the fourth working portion meshing with the second working portion, and the third working portion and the fourth working portion can rotate about a second axis.

[0019] In some embodiments, the first end surface is provided with a wear-resistant coating and / or the first inner wall is provided with a wear-resistant coating.

[0020] In some embodiments, the first working part includes a plurality of first spiral leaves, the plurality of first leaf grooves are respectively adjacent to the plurality of first spiral leaves, the number of the at least one first air pressure groove is multiple, and each first spiral leaf is provided with at least one first air pressure groove.

[0021] In some embodiments, a plurality of the first air pressure grooves are distributed on the first end surface in a ring shape around the center of the first end surface.

[0022] In some embodiments, the number of the plurality of first air pressure grooves is equal to the number of the plurality of first spiral leaves, each of the plurality of first air pressure grooves is respectively opened on the end face of a different first spiral leaf, and each of the plurality of first air pressure grooves is respectively connected to a different first leaf groove.

[0023] A third aspect of the present invention provides a compressor comprising the compressor according to the second aspect of the present invention.

[0024] Based on the technical solution provided by the present invention, the rotor assembly includes a first rotor, the first rotor including a first working part and a second working part arranged coaxially, the first working part and the second working part being rotatable about a first axis, the first working part including a plurality of first spiral blades, a first blade groove being formed between two adjacent first spiral blades, and at least one first air pressure groove being provided on the first end face of the first working part away from the second working part, the first air pressure groove forming a force along the first axis toward a preset direction when the first air pressure groove rotates. The first working part of the compressor of the present invention draws in gas in the first blade groove through the first air pressure groove and pressurizes it, thereby forming a fixed gas axial force directed toward the second working part, ensuring that the rotor shaft system is always subjected to only an axial force in a fixed direction, and therefore only one set of thrust bearings is required to bear the gas axial force directed toward the second working part, reducing the use of thrust bearings.

[0025] The compressor includes a housing and a rotor assembly, wherein the housing includes a first inner wall; the rotor assembly includes a first rotor, the first rotor including a first working portion and a second working portion coaxially arranged within the housing, the first working portion and the second working portion being rotatable about a first axis, the first working portion including a plurality of first spiral blades, a first blade groove formed between two adjacent first spiral blades, a first end surface of the first working portion away from the second working portion being provided with at least one first air pressure groove, the first end surface being gap-fitted with the first inner wall, and the first air pressure groove generating a force along the first axis toward a preset direction when rotating. The first working portion of the compressor of the present invention draws in gas within the first blade groove through the first air pressure groove and pressurizes it, thereby generating a fixed axial force of the gas directed toward the second working portion, ensuring that the rotor shaft system is always subjected to only an axial force in a fixed direction. Therefore, only one set of thrust bearings is required to bear the axial force of the gas directed toward the second working portion, thereby reducing the use of thrust bearings, reducing the cost of the compressor, reducing the volume of the compressor, simplifying the structure of the compressor's operating components, and improving the performance and reliability of the compressor. At the same time, after eliminating the thrust bearing used to bear the axial force of the gas directed to the second working part, a layer of air film formed between the first end face of the first working part and the first inner wall of the shell can prevent the first rotor from colliding and rubbing with the shell and causing failure, further improving the performance and reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0027] In order to more completely understand the present invention and its beneficial effects, the following description will be given with reference to the accompanying drawings, wherein the same reference numerals in the following description represent the same parts.

[0028] Figure 1 A schematic diagram of the partial structure of a compressor provided by an embodiment of the present invention.

[0029] Figure 2 A schematic structural diagram of a rotor assembly provided in an embodiment of the present invention.

[0030] Figure 3 An end view of one end of a first rotor and a second rotor of a first rotor assembly provided by an embodiment of the present invention.

[0031] Figure 4 This is an end view of the other ends of the first rotor and the second rotor of the second rotor assembly provided by an embodiment of the present invention.

[0032] Figure 5 This is an end view of one end of the first rotor and the second rotor of a third rotor assembly provided by an embodiment of the present invention.

[0033] Figure 6 This is an end view of the other ends of the first rotor and the second rotor of the fourth rotor assembly provided by an embodiment of the present invention.

[0034] 100, first shaft; 110, first axis;

[0035] 200, first rotor; 210, first working portion; 211, first spiral blade; 212, first blade groove; 213, first air pressure groove; 214, first end surface; 220, second working portion; 221, second spiral blade; 222, second blade groove; 223, second air pressure groove; 224, second end surface;

[0036] 300, second shaft; 310, second axis;

[0037] 400, second rotor; 410, third working portion; 411, third spiral blade; 412, third blade groove; 413, third air pressure groove; 414, third end surface; 420, fourth working portion; 421, fourth spiral blade; 422, fourth blade groove; 423, fourth air pressure groove; 424, fourth end surface;

[0038] 500, first bearing housing; 510, first inner wall;

[0039] 600, rotor housing; 610, hollow chamber;

[0040] 700, second bearing housing; 710, second inner wall;

[0041] 800, housing;

[0042] 900, thrust bearing;

[0043] 1000, compressor;

[0044] 1100, rotor assembly;

[0045] H1, first direction;

[0046] H2, second direction. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0048] References herein to "embodiments" or "implementations" mean that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present invention. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] See also Figure 1 , Figure 1 A schematic diagram of the partial structure of a compressor provided by an embodiment of the present invention. Figure 1 The compressor 1000 shown may be a screw compressor, such as an opposed screw compressor. Figure 1 The compressor 1000 shown is not limited to a screw compressor; for example, the compressor 1000 may also be a scroll compressor. The compressor 1000 includes a rotor assembly 1100 consisting of a first shaft 100, a first rotor 200, a second shaft 300, and a second rotor 400, and a housing 800 surrounded by a first bearing housing 500, a rotor housing 600, and a second bearing housing 700. The rotor housing 600 includes a hollow chamber 610. At least a portion of the first shaft 100, the first rotor 200, at least a portion of the second shaft 300, and the second rotor 400 are accommodated within the hollow chamber 610 of the rotor housing 600. The first bearing housing 500 covers one end of the rotor housing 600 to form one end of the housing 800, and the second bearing housing 700 covers the other end of the rotor housing 600 to form the other end of the housing 800.

[0050] The first rotor 200 and the second rotor 400 mesh and transmit. In an embodiment of the present invention, the first rotor 200 may be a male rotor, and the second rotor 400 may be a female rotor. In other embodiments of the present invention, the first rotor 200 may be a female rotor, and the second rotor 400 may be a male rotor. The following detailed description of the embodiment of the present invention uses the example of the first rotor 200 being a male rotor and the second rotor 400 being a female rotor.

[0051] The first rotor 200 as the male rotor can be understood as the active rotor, and the second rotor 400 as the female rotor can be understood as the driven rotor. For example, the first rotor 200 can be in transmission connection with a drive assembly, such as a motor (including but not limited to a permanent magnet motor). The first rotor 200 can be driven to rotate by the drive assembly, and the rotation of the first rotor 200 simultaneously drives the second rotor 400 to rotate together through meshing transmission.

[0052] The first rotor 200 is supported by and fixedly connected to the first shaft 100. One end of the first shaft 100 is rotatably mounted on the first bearing housing 500, and the other end of the first shaft 100 is rotatably mounted on the second bearing housing 700. One end of the first shaft 100 is in transmission connection with a drive assembly. The drive assembly can drive the first shaft 100 to rotate, and the first shaft 100, together with the first rotor 200 to which it is fixedly connected, can rotate along the first axis 110 of the first shaft 100 on the first bearing housing 500 and the second bearing housing 700. In other embodiments of the present invention, the first rotor 200 can be integrally formed with the first shaft 100. In other embodiments of the present invention, the first rotor 200 can be partially integrally formed with the first shaft 100 and partially sleeved on the first shaft 100. In other embodiments of the present invention, the first rotor 200 can be directly sleeved on the first shaft 100.

[0053] See also Figure 2 , Figure 2 A schematic structural diagram of a rotor assembly provided in an embodiment of the present invention. The first rotor 200 may have at least two parts, such as a first working part 210 and a second working part 220 arranged coaxially. The first working part 210 of the first rotor 200 is integrally formed with the first shaft 100, and the second working part 210 is sleeved on the first shaft 100 and adjacent to the first working part 210. In an embodiment of the present invention, the adjacent end surfaces of the first working part 210 and the second working part 220 may fit together. In other embodiments of the present invention, the adjacent end surfaces of the first working part 210 and the second working part 220 may not fit together but may have a smaller gap, such as 0.1 mm, 0.2 mm, 0.3 mm, etc.

[0054] It should be understood that, in an alternative embodiment, the first working portion 210 and the second working portion 220 may be integrally formed with the first shaft 100 . Alternatively, the first working portion 210 and the second working portion 220 may be sleeved on the first shaft 100 .

[0055] Please continue reading Figure 1 and Figure 2The first rotor 200 has spiral lobes, also known as male lobes. Specifically, the first working portion 210 has a plurality of first spiral lobes 211 and a plurality of first lobe slots 212 adjacent to the plurality of first spiral lobes 211, with a first lobe slot 212 formed between two adjacent first spiral lobes 211. The second working portion 220 has a plurality of second spiral lobes 221 and a plurality of second lobe slots 222 adjacent to the plurality of second spiral lobes 221, with a second lobe slot 222 formed between two adjacent second spiral lobes 221. In this embodiment of the present invention, the first spiral lobes 211 and the second spiral lobes 221 are configured to have opposite spiral directions. When the first rotor 200 and the second rotor 400 engage and rotate with each other, opposite axial forces are generated between the first spiral lobes 211 and the second spiral lobes 221. This can also be understood as the generation of opposite axial forces between the first spiral lobes 211 and the second spiral lobes 221. Due to the symmetry of the axial forces, the opposing axial forces generated between the first spiral lobes 211 and the second spiral lobes 221 are almost offset.

[0056] It should be noted that, in the description of the present invention, “plurality” means two or more than two, unless otherwise clearly defined.

[0057] Please continue reading Figure 1 and Figure 2 The second rotor 400 is supported by and fixedly connected to the second shaft 300. One end of the second shaft 300 is rotatably mounted on the first bearing housing 500, and the other end of the second shaft 300 is rotatably mounted on the second bearing housing 700. Alternatively, in an alternative embodiment, the second rotor 400 is supported by and rotatably connected to the second shaft 300. One end of the second shaft 300 is fixedly mounted on the first bearing housing 500, and the other end of the second shaft 300 is fixedly mounted on the second bearing housing 700. The second rotor 400 meshes with the first rotor 200 and can be driven by the first rotor 200 to rotate on the second shaft 300 along the second axis 310 of the second shaft 300 on the first bearing housing 500 and the second bearing housing 700. In other words, the second rotor 400 is rotatably supported on the first bearing housing 500 and the second bearing housing 700. In the embodiment of the present invention, the second rotor 400 may have at least two parts, such as a coaxially arranged third working part 410 and a fourth working part 420. The third working part 410 and the fourth working part 420 are both sleeved on the second shaft 300. The third working part 410 and the fourth working part 420 can both rotate around the second axis 310 within the housing 800.

[0058] The third working portion 410 is meshed with the first working portion 210 for transmission, and the fourth working portion 420 is meshed with the second working portion 220 for transmission. The rotation direction of the third working portion 410 is opposite to that of the first working portion 210, and the rotation direction of the fourth working portion 420 is opposite to that of the second working portion 220.

[0059] The second rotor 400 has spiral lobes, also known as female lobes. Specifically, the third working portion 410 has a plurality of third spiral lobes 411 and a plurality of third lobe slots 412 adjacent to each of the third spiral lobes 411, with a third lobe slot 412 formed between two adjacent third spiral lobes 411. The fourth working portion 420 has a plurality of fourth spiral lobes 421 and a plurality of fourth lobe slots 422 adjacent to each of the fourth spiral lobes 421, with a fourth lobe slot 422 formed between two adjacent fourth spiral lobes 421. The third spiral lobes 411 engage with corresponding first lobe slots 212, the first spiral lobes 211 engage with corresponding third lobe slots 412, the fourth spiral lobes 421 engage with corresponding second lobe slots 222, and the second spiral lobes 221 engage with corresponding fourth lobe slots 422. In this embodiment of the present invention, the third helical lobe 411 and the fourth helical lobe 421 are configured to have opposite spiral directions. When the first rotor 200 and the fourth rotor 400 engage and rotate with each other, opposing axial forces are generated between the third helical lobe 411 and the fourth helical lobe 421. This can also be understood as generating opposing axial flows between the third helical lobe 411 and the fourth helical lobe 421. Due to the symmetry of the axial forces, the opposing axial forces generated between the third helical lobe 411 and the fourth helical lobe 421 are nearly offset.

[0060] It should be noted that the terms "first," "second," "third," "fourth," etc. in the specification and claims of the present invention and the accompanying drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0061] For the first rotor 200 and the second rotor 400, when the first rotor 200 and the second rotor 400 rotate together in meshing transmission, opposite axial forces can be generated due to the opposite rotational directions between the first working portion 210 and the second working portion 220, and opposite axial forces can be generated due to the opposite rotational directions between the third working portion 410 and the fourth working portion 420. The axial forces between the first working portion 210 and the second working portion 220 can be offset to a certain extent, and the axial forces between the third working portion 410 and the fourth working portion 420 can be offset to a certain extent.

[0062] However, it should be noted that during the actual production process, it was discovered that, on the one hand, due to manufacturing deviations, there were some structural differences between different parts of the first rotor 200, and on the other hand, there were some structural differences between different parts of the second rotor 400. Furthermore, there were also differences between the first rotor 200 and the second rotor 400. Furthermore, due to assembly tolerances and deviations, there were certain differences in the fit between the first rotor 200 and the second rotor 400. Consequently, the axial forces between the first working portion 210 and the second working portion 220 could not be completely offset, and the axial forces between the third working portion 410 and the fourth working portion 420 could not be completely offset. This made it impossible to achieve near-complete offset of the axial forces when the first rotor 200 and the second rotor 400 meshed and rotated together, resulting in a random axial force resultant. This axial force resultant could be in the first direction H1 or the second direction H2.

[0063] On the other hand, during compressor product quantification, due to the differences between the rotors in each compressor, the direction of the resultant axial force generated by the rotors varies. For example, the direction of the resultant axial force of the rotors in some compressors is in the first direction H1, while the direction of the resultant axial force of the rotors in others is in the second direction H2. This results in a resultant force with a random axial direction and value within the entire rotor shaft system, which randomly pushes the entire shaft system toward one of the first bearing housing 500 and the second bearing housing 700, causing the rotor surface on that side to contact and rub against the housing, leading to failure.

[0064] In the related art, in order to ensure that all molded compressors can operate stably, two sets of thrust bearings (or axial force bearings) are installed on each shaft of the compressor to limit the resultant axial force of the rotors in all molded compressors to ensure that all molded compressors can operate stably.

[0065] Therefore, it is still inevitable that thrust bearings are required to carry and limit the force. However, due to the randomness of the direction of the resultant force, thrust bearings need to meet the requirements of being able to carry and limit the force in both directions. That is, in the actual production and processing of the compressor, in order to ensure the limitation of the resultant axial force of the rotor, thrust bearings (axial force bearings) with two directions of limitation are still required on one rotating shaft. For example, the compressor is equipped with two sets of thrust bearings with opposite load-bearing directions to ensure that the resultant axial force in the two directions that randomly appears is carried. However, for an independent compressor, the direction of the resultant axial force that randomly appears is always the same. At this time, one set of thrust bearings is used for limiting the force, while the other set of thrust bearings is completely idle. Therefore, the cost-effectiveness is low, and it also comes with excess mechanical loss and lubricating oil demand, and increases the failure rate of the compressor. Ultimately, it leads to an increase in the size and cost of the compressor assembly, and to a certain extent reduces the mechanical efficiency of the shaft system operation and increases the demand for lubricating oil.

[0066] Based on this, see Figure 3 , Figure 3 An end view of one end of the first rotor and the second rotor of the first rotor assembly provided by an embodiment of the present invention. Figure 2 As shown, the first end surface 214 of the first working part 210 away from the second working part 220 is provided with at least one first air pressure groove 213, and the at least one first air pressure groove 213 is respectively connected to at least one of the multiple first leaf grooves 212 of the first working part 210. When the first air pressure groove 213 rotates, it forms a force along the first axis 110 toward a preset direction.

[0067] The first end surface 214 is loosely assembled with the first inner wall 510 of the first bearing housing 500. When the first working portion 210 and the second working portion 220 rotate about the first axis 110, the at least one first air pressure groove 213 draws in and pressurizes air from at least one of the plurality of first blade grooves 212 to form an air film between the first end surface 214 and the first inner wall 510, thereby preventing the first working portion 210 from interfering with the first inner wall 510.

[0068] In the embodiment of the present invention, the first working portion 210 of the compressor 1000 draws in and pressurizes the gas within the first vane slot 212 through the first air pressure groove 213, thereby generating a fixed axial force directed toward the second working portion 220. This ensures that the rotor shaft system is always subjected to an axial force in a fixed direction. Consequently, only one set of thrust bearings 900 is required to support the axial force directed toward the second working portion 220. This reduces the number of thrust bearings, reduces the cost of the compressor 1000, reduces the size of the compressor 1000, simplifies the structure of the operating components of the compressor 1000, and improves the performance and reliability of the compressor 1000. Furthermore, by eliminating the thrust bearings used to support the axial force directed toward the second working portion 220, a gas film is formed between the first end surface 214 of the first working portion 210 and the first inner wall 510 of the housing 800, preventing the first rotor 200 from colliding with the housing 800 and causing failure, further improving the performance and reliability of the compressor 1000.

[0069] On the basis of the first rotor assembly mentioned above, further, please refer to Figure 4 , Figure 4 This is an end view of the other end of the first rotor and the second rotor of the second rotor assembly provided by the embodiment of the present invention. Figure 2 As shown, the second working part 220 is provided with at least one second air pressure groove 223 on the second end surface 224 away from the first working part 210, and the at least one second air pressure groove 223 is respectively connected to at least one of the multiple second leaf grooves 222 of the second working part 220. When the second air pressure groove 223 rotates, it forms a force along the first axis 110 toward a preset direction.

[0070] The second end surface 224 is gap-fitted with the second inner wall 710 of the second bearing housing 700. The second inner wall 710 is spaced apart and disposed opposite the first inner wall 510. When the first working portion 210 and the second working portion 220 rotate about the first axis 110, the at least one second air pressure groove 223 draws air from at least one of the plurality of second blade grooves 222 and pressurizes it, forming an air film between the second end surface 224 and the second inner wall 710 to prevent the second working portion 220 from interfering with the second inner wall 710.

[0071] In the embodiment of the present invention, the first working portion 210 of the compressor 1000 draws in and pressurizes the gas within the first lobe groove 212 through the first air pressure groove 213, thereby generating a fixed axial force of the gas directed toward the second working portion 220. The second working portion 220 of the compressor 1000 draws in and pressurizes the gas within the second lobe groove 222 through the second air pressure groove 223, thereby generating a fixed axial force of the gas directed toward the first working portion 210. These two axial forces of gas can balance the axial force on the first rotor 200, thereby completely eliminating the need for a thrust bearing on the first shaft 100. This embodiment of the present invention can further reduce the cost and size of the compressor 1000, simplify the structure of the operating components of the compressor 1000, and improve the performance and reliability of the compressor 1000. At the same time, after eliminating the thrust bearings used to bear the axial force of the gas directed to the two ends of the first rotor 200, the air film formed between the first end face 214 and the first bearing housing 500 and between the second end face 224 and the second bearing housing 700 can prevent the two ends of the first rotor 200 from colliding and rubbing with the first bearing housing 500 and the second bearing housing 700 respectively, thereby preventing failure. This further improves the performance and reliability of the compressor 1000.

[0072] On the basis of the first rotor assembly mentioned above, further, please refer to Figure 5 , Figure 5 An end view of one end of the first rotor and the second rotor of the third rotor assembly provided by an embodiment of the present invention. Figure 2 As shown, the third working part 410 is provided with at least one third air pressure groove 413 on the third end face 414 away from the fourth working part 420, and the at least one third air pressure groove 413 is respectively connected to at least one of the multiple third leaf grooves 412 of the third working part 410. When the third air pressure groove 413 rotates, it forms a force along the second axis 310 toward a preset direction.

[0073] The third end surface 414 is loosely assembled with the first inner wall 510 of the first bearing housing 500. When the third working portion 410 and the fourth working portion 420 rotate about the second axis 310, at least one third air pressure groove 413 draws in and pressurizes air from at least one of the plurality of third leaf grooves 412 to form an air film between the third end surface 414 and the first inner wall 510, thereby preventing the third working portion 410 from interfering with the first inner wall 510.

[0074] In the compressor 1000 of the embodiment of the present invention, the first working portion 210 draws and pressurizes the gas within the first vane slot 212 through the first air pressure groove 213. The third working portion 410 draws and pressurizes the gas within the third vane slot 412 through the third air pressure groove 413, thereby generating a fixed axial force of the gas directed toward the second working portion 220 and the fourth working portion 420. This ensures that the rotor shaft system is always subjected to only an axial force in a fixed direction. Therefore, only a set of thrust bearings need to be provided on the first shaft body 100 and the second shaft body 300, respectively, to bear the axial force of the gas directed toward the second working portion 220 and the fourth working portion 420, thereby reducing the need for thrust bearings. The embodiment of the present invention can reduce the cost and volume of the compressor 1000, simplify the structure of the operating components of the compressor 1000, and improve the performance and reliability of the compressor 1000. At the same time, after eliminating the thrust bearing used to bear the axial force of the gas directed to the second working part 220 and the fourth working part 420, the air film formed between the first end face 214 and the first bearing housing 500 and the second end face 224 and the first bearing housing 500 can prevent the first rotor 200 and the second rotor 400 from colliding and rubbing with the first bearing housing 500 and causing failure, thereby further improving the performance and reliability of the compressor 1000.

[0075] On the basis of the aforementioned second rotor assembly, further, please refer to Figure 6 , Figure 6 An end view of the other end of the first rotor and the second rotor of the second rotor assembly provided by an embodiment of the present invention. Figure 2 As shown, at least one third air pressure groove 413 is provided on a third end surface 414 of the third working portion 410, which is away from the fourth working portion 420. The at least one third air pressure groove 413 is respectively connected to at least one of the plurality of third leaf grooves 412 of the third working portion 410. At least one fourth air pressure groove 423 is provided on a fourth end surface 424 of the fourth working portion 420, which is away from the third working portion 410. The at least one fourth air pressure groove 423 is respectively connected to at least one of the plurality of fourth leaf grooves 422 of the fourth working portion 420. When the fourth air pressure groove 423 rotates, it generates a force along the second axis 310 toward a predetermined direction.

[0076] The third end surface 414 is fitted with a clearance between the first inner wall 510 of the first bearing housing 500, and the fourth end surface 424 is fitted with a clearance between the second inner wall 710 of the second bearing housing 700. When the third working portion 410 and the fourth working portion 420 rotate about the second axis 310, at least one third air pressure groove 413 draws gas from at least one of the plurality of third blade grooves 412 and applies pressure to form an air film between the third end surface 414 and the first inner wall 510, thereby preventing the third working portion 410 from interfering with the first inner wall 510. At least one fourth air pressure groove 423 draws gas from at least one of the plurality of fourth blade grooves 422 and applies pressure to form an air film between the fourth end surface 424 and the second inner wall 710, thereby preventing the fourth working portion 420 from interfering with the second inner wall 710.

[0077] The first working part 210 of the compressor 1000 in the embodiment of the present invention sucks the gas in the first blade groove 212 through the first air pressure groove 213 and pressurizes it, thereby forming a fixed gas axial force pointing to the second working part 220. The second working part 220 of the compressor 1000 sucks the gas in the second blade groove 222 through the second air pressure groove 223 and pressurizes it, thereby forming a fixed gas axial force pointing to the first working part 210. The gas axial forces in these two directions can balance the axial force on the first rotor 200, so that the thrust bearing set on the first shaft body 100 can be further completely eliminated. At the same time, the third working portion 410 of the compressor 1000 draws in and pressurizes the gas in the third lobe 412 through the third air pressure groove 413, thereby generating a fixed axial force of the gas directed toward the second working portion 220. The fourth working portion 420 of the compressor 1000 draws in and pressurizes the gas in the fourth lobe 422 through the fourth air pressure groove 423, thereby generating a fixed axial force of the gas directed toward the first working portion 210. These two axial forces of gas can balance the axial force on the second rotor 400, thereby completely eliminating the need for a thrust bearing on the second shaft 300. This embodiment of the present invention can further reduce the cost of the compressor 1000, reduce the size of the compressor 1000, simplify the structure of the operating components of the compressor 1000, and improve the performance and reliability of the compressor 1000. At the same time, after eliminating the thrust bearings used to bear the axial gas force directed to the two ends of the first rotor 200 and the second rotor 400, the air film formed between the two ends of the first rotor 200 and the second rotor 400 and the first bearing housing 500 and the second bearing housing 700 respectively can prevent the two ends of the first rotor 200 and the second rotor 400 from colliding and rubbing with the first bearing housing 500 and the second bearing housing 700 respectively and causing failure, thereby further improving the performance and reliability of the compressor 1000.

[0078] In some embodiments, the first end face 214, the second end face 224, the third end face 414, the fourth end face 424 and / or the first inner wall 510, the second inner wall 710 are provided with a wear-resistant coating. The wear-resistant coating can be formed by spraying ceramics, alloys, oxides, fluoroplastics, etc. on the first end face 214, the second end face 224, the third end face 414, the fourth end face 424 and / or the first inner wall 510, the second inner wall 710 by plasma spraying, arc spraying, or flame spraying, or by using a wear-resistant coating glue prepared by various resins, elastomers, etc., which is applied to the first end face 214, the second end face 224, the third end face 414, the fourth end face 424 and / or the first inner wall 510, the second inner wall 710 and then cured naturally or by heating.

[0079] In the embodiment of the present invention, by providing a wear-resistant coating on the first end face 214, the second end face 224, the third end face 414, the fourth end face 424 and / or the first inner wall 510, the second inner wall 710, it is possible to prevent the air film at both ends of the first rotor 200 and the second rotor 400 from having insufficient force to act on the first rotor 200 and the second rotor 400 during the initial startup stage or shutdown stage of the compressor 1000, so that the two ends of the first rotor 200 and the second rotor 400 are easily in contact with the first bearing housing 500 and the second bearing housing 700 respectively, thereby further improving the performance and reliability of the compressor 1000.

[0080] In some embodiments, the gaps between the first end surface 214 and the third end surface 414 and the first inner wall 510 are 3-5 microns, and the gaps between the second end surface 224 and the fourth end surface 424 and the second inner wall 710 are 3-5 microns. In this embodiment of the present invention, by setting the gaps between the first end surface 214 and the third end surface 414 and the first inner wall 510 to 3-5 microns, and the gaps between the second end surface 224 and the fourth end surface 424 and the second inner wall 710 to 3-5 microns, the air films at both ends of the first rotor 200 and the second rotor 400 can be ensured to have strong rigidity. Furthermore, the end surfaces of the first rotor 200 and the second rotor 400 are completely separated from the first bearing housing 500 and the second bearing housing 700, respectively, without collision or friction.

[0081] In some embodiments, such as Figure 3-6 As shown, there are multiple first air pressure grooves 213, multiple second air pressure grooves 223, multiple third air pressure grooves 413, and multiple fourth air pressure grooves 423. The number of multiple first air pressure grooves 213 is equal to the number of multiple first spiral leaves 211, the number of multiple second air pressure grooves 223 is equal to the number of multiple second spiral leaves 221, the number of multiple third air pressure grooves 413 is equal to the number of multiple third spiral leaves 411, and the number of multiple fourth air pressure grooves 423 is equal to the number of multiple fourth spiral leaves 421.

[0082] In some embodiments, such as Figure 3-6 As shown, multiple first air pressure grooves 213 are distributed on the first end surface 214 in a spiral shape around the center of the first end surface 214, multiple second air pressure grooves 223 are distributed on the second end surface 224 in a spiral shape around the center of the second end surface 224, multiple third air pressure grooves 413 are distributed on the third end surface 414 in a spiral shape around the center of the third end surface 414, and multiple fourth air pressure grooves 423 are distributed on the fourth end surface 424 in a spiral shape around the center of the fourth end surface 424.

[0083] In some embodiments, such as Figure 3-6 As shown, each of the multiple first air pressure grooves 213 is respectively opened on the end surface of a different first spiral leaf 211, and each of the multiple first air pressure grooves 213 is respectively connected to a different first leaf groove 212, each of the multiple second air pressure grooves 223 is respectively opened on the end surface of a different second spiral leaf 221, and each of the multiple second air pressure grooves 223 is respectively connected to a different second leaf groove 222, each of the multiple third air pressure grooves 413 is respectively opened on the end surface of a different third spiral leaf 411, and each of the multiple third air pressure grooves 413 is respectively connected to a different third leaf groove 412, each of the multiple fourth air pressure grooves 423 is respectively opened on the end surface of a different fourth spiral leaf 421, and each of the multiple fourth air pressure grooves 423 is respectively connected to a different fourth leaf groove 422.

[0084] The compressor 1000 in one or more of the above embodiments may be applied to an air conditioner.

[0085] An embodiment of the present invention further provides an air conditioner, which includes a compressor 1000 defined in combination with one or more of the above embodiments.

[0086] The rotor assembly, compressor and air conditioner provided in the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A rotor assembly, characterized in that: include: A first rotor includes a first working portion and a second working portion arranged coaxially, the first working portion and the second working portion being rotatable about a first axis, the first working portion including a plurality of first spiral lobes, a first lobe groove being formed between two adjacent first spiral lobes, and at least one first air pressure groove being provided on a first end surface of the first working portion away from the second working portion, wherein the first air pressure groove generates a force along the first axis in a predetermined direction when rotating; The at least one first air pressure groove is respectively communicated with at least one of the plurality of first leaf grooves of the first working part; The at least one first gas pressure groove is capable of sucking gas from at least one of the plurality of first blade grooves and pressurizing the gas to form a gas axial force directed toward the second working portion; The first working portion and the second working portion have opposite directions of rotation.

2. The rotor assembly according to claim 1, wherein: The rotor assembly also includes a second rotor including a third working portion and a fourth working portion arranged coaxially, the third working portion meshing with the first working portion, the fourth working portion meshing with the second working portion, and the third working portion and the fourth working portion being rotatable about a second axis.

3. The rotor assembly according to claim 2, wherein: The first end surface is provided with a wear-resistant coating.

4. The rotor assembly according to claim 2, wherein: The first working part includes a plurality of first spiral leaves, the plurality of first leaf grooves are respectively adjacent to the plurality of first spiral leaves, the number of the at least one first air pressure groove is multiple, and each first spiral leaf is provided with at least one first air pressure groove.

5. The rotor assembly according to claim 4, wherein: A plurality of the first air pressure grooves are distributed on the first end surface in a spiral shape around the center of the first end surface.

6. The rotor assembly according to claim 5, wherein: The number of the multiple first air pressure grooves is equal to the number of the multiple first spiral leaves. Each of the multiple first air pressure grooves is respectively opened on the end face of a different first spiral leaf. Each of the multiple first air pressure grooves is respectively connected to a different first leaf groove.

7. A compressor, characterized in that: include: a housing comprising a first inner wall; as well as A rotor assembly comprising: a first rotor comprising a first working portion and a second working portion coaxially arranged and accommodated within the housing, the first working portion and the second working portion being rotatable about a first axis, the first working portion comprising a plurality of first spiral blades, a first blade groove being formed between two adjacent first spiral blades, at least one first air pressure groove being provided on a first end surface of the first working portion remote from the second working portion, the first end surface being gap-fitted with the first inner wall, and the first air pressure groove generating a force along the first axis in a predetermined direction when rotating; The at least one first air pressure groove is respectively communicated with at least one of the plurality of first leaf grooves of the first working part; The at least one first gas pressure groove is capable of sucking gas from at least one of the plurality of first blade grooves and pressurizing the gas to form a gas axial force directed toward the second working portion; The first working portion and the second working portion have opposite directions of rotation.

8. The compressor according to claim 7, characterized in that The rotor assembly also includes a second rotor including a third working portion and a fourth working portion arranged coaxially, the third working portion meshing with the first working portion, the fourth working portion meshing with the second working portion, and the third working portion and the fourth working portion being rotatable about a second axis.

9. The compressor according to claim 8, characterized in that The first end surface is provided with a wear-resistant coating and / or the first inner wall is provided with a wear-resistant coating.

10. The compressor according to claim 8, characterized in that The first working part includes a plurality of first spiral leaves, the plurality of first leaf grooves are respectively adjacent to the plurality of first spiral leaves, the number of the at least one first air pressure groove is multiple, and each first spiral leaf is provided with at least one first air pressure groove.

11. The compressor according to claim 10, characterized in that A plurality of the first air pressure grooves are distributed on the first end surface in a spiral shape around the center of the first end surface.

12. The compressor according to claim 11, characterized in that The number of the multiple first air pressure grooves is equal to the number of the multiple first spiral leaves. Each of the multiple first air pressure grooves is respectively opened on the end face of a different first spiral leaf. Each of the multiple first air pressure grooves is respectively connected to a different first leaf groove.

13. An air conditioner, characterized in that: Comprising the compressor according to any one of claims 7-12.

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