Rotor assembly, compressor and air conditioning apparatus

Abstract

The application provides a rotor assembly, a compressor and an air conditioning device. The rotor assembly comprises a rotor pair, the rotor pair comprises a first rotor, the first rotor can rotate around a first axis and generate an axial force along the direction of the first axis, the direction of gravity of the first rotor is the same as the direction of the first axis or the gravity of the first rotor has a gravity component along the direction of the first axis; the axial force and a plurality of acting forces form a resultant force along a preset direction, wherein the plurality of acting forces comprise the gravity or the gravity component of at least the first rotor in the rotor pair. The application sets the rotor pair vertically or obliquely, so that the gravity or the gravity component of the rotor pair and the axial force form a resultant force along a preset direction, and then the rotor pair is only subjected to the action of the resultant force in a single direction, thereby avoiding the influence of the change of the direction of the axial force on the work of the rotor pair.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, specifically to a rotor assembly, a compressor, and an air conditioning device. Background Technology

[0002] Currently, screw compressors are characterized by their small size, light weight, and ease of maintenance. They are mainly used in compressed air and medium-sized refrigeration and heat pump air conditioning systems. Due to the continuous improvement in the reliability of screw compressors, they have gradually replaced reciprocating compressors in the medium cooling capacity range and have occupied a part of the centrifugal compressor market.

[0003] In existing technology, screw compressors have two pairs of meshing rotors, each with two meshing working parts. These two working parts work together to deliver the compressed medium, increasing the compressor's discharge capacity. Simultaneously, because both working parts work together to deliver the compressed medium, the axial forces generated by the two rotors cancel each other out. However, during the actual machining and assembly of the two working parts of the two rotors, it is difficult to ensure that the machining dimensions and assembly precision are completely identical. Therefore, the axial forces generated by the two working parts of the two rotors are not entirely the same. Furthermore, during actual operation, the unstable flow rate caused by start-up, shutdown, and abnormal operating conditions will also lead to fluctuations in the magnitude and even changes in the direction of the axial forces generated by the two working parts of the two rotors. Therefore, during the actual machining and assembly of screw compressors, it is necessary to limit the axial forces of the two rotors, for example, by installing thrust bearings at both ends of the two rotors. This results in an increase in the overall size and cost of the compressor. Summary of the Invention

[0004] This invention provides a rotor assembly, a compressor, and an air conditioning device, aiming to solve the technical problem of uncertain axial force direction generated by the two working parts of existing screw compressors.

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

[0006] The rotor pair includes a first rotor, which has a first working part and a second working part arranged coaxially and with opposite helical directions. The first rotor is capable of rotating about a first axis and generating an axial force along the direction of the first axis. The gravity direction of the first rotor is the same as that of the first axis or the gravity of the first rotor has a gravity decomposition force along the direction of the first axis.

[0007] The axial force and multiple forces form a resultant force along a predetermined direction, wherein the multiple forces include the gravity or gravity decomposition force of at least the first rotor in the rotor pair.

[0008] In some embodiments, the first working part has right-handed helical blades, the second working part has left-handed helical blades, and the rotation direction of the first rotor is counterclockwise; or

[0009] The first working part has a left-handed spiral blade, the second working part has a right-handed spiral blade, and the first rotor rotates in a clockwise direction.

[0010] In some embodiments, the rotor pair further includes a second rotor, which is rotatable about a second axis;

[0011] The second rotor has a first sub-working part and a second sub-working part. The first sub-working part meshes with the first working part and is arranged in opposite spiral directions. The second sub-working part meshes with the second working part and is arranged in opposite spiral directions.

[0012] The combined forces that work with the axial force also include the gravity of the second rotor in the rotor centering or the gravity decomposition force along the first axis.

[0013] In some embodiments, the rotor pair further includes a first shaft and a second shaft;

[0014] The first rotating bearing carries the first working part and the second working part;

[0015] The second rotating bearing carries the first sub-working part and the second sub-working part;

[0016] The multiple forces that combine with the axial force also include the gravity of the first and second shafts or the gravity decomposition force along the first axis.

[0017] In some embodiments, an axial force limiting member is further included, which is connected to a first rotating shaft and / or a second rotating shaft to counteract the resultant force along a preset direction.

[0018] In some embodiments, the axial force limiting member includes a first thrust bearing disposed on a first rotating shaft and a second thrust bearing disposed on a second rotating shaft.

[0019] In some embodiments, the first rotating shaft drives the first rotor to rotate, and the second rotor meshing with the first rotor rotates around the second rotating shaft;

[0020] The axial force limiting component includes a first thrust bearing disposed on the first rotating shaft;

[0021] The second rotor is made of non-metallic materials.

[0022] In some embodiments, the axial force limiting element is at least one of a thrust ball bearing, a thrust cylindrical roller bearing, a thrust needle roller bearing, a thrust tapered roller bearing, or a thrust self-aligning roller bearing.

[0023] In some embodiments, the mass of the rotor pair satisfies the following relationship:

[0024] m≥f / (sinα*g)

[0025] Where m is the mass of the rotor pair; f is the maximum axial force of the rotor pair when transporting fluid; α is the angle between the axis of the first rotor and the horizontal plane; and g is the acceleration due to gravity.

[0026] In a second aspect, the present invention provides a compressor, including the rotor assembly and motor assembly described in the first aspect;

[0027] The motor assembly includes a motor rotor and a motor stator arranged coaxially. The motor rotor is coaxially connected to the first rotor of the rotor assembly. The motor stator generates a magnetic field to drive the motor rotor to rotate the first rotor.

[0028] The combined forces that work with the axial force also include the gravity of the motor assembly or the gravitational decomposition force along the first axis.

[0029] In some embodiments, the motor assembly is located at the end of the first rotor opposite to a preset direction; or

[0030] The motor assembly is located at the end of the first rotor that is in the same direction as the preset direction.

[0031] Thirdly, the present invention provides an air conditioning device, including a rotor assembly as described in the first aspect or a compressor as described in the second aspect.

[0032] The rotor assembly provided by this invention arranges the rotor pair vertically or at an angle, such that the direction of gravity of the rotor pair is the same as the direction of the first rotor axis, or the gravity of the rotor pair has a gravity decomposition force along the direction of the first rotor axis. During operation, when the axial force of the rotor pair is opposite to the direction of gravity or gravity decomposition force of the rotor pair, the gravity or gravity decomposition force of the rotor pair cancels out the axial force to form a resultant force along a preset direction. Conversely, when the axial force of the rotor pair is in the same direction as the gravity or gravity decomposition force of the rotor pair, the gravity or gravity decomposition force of the rotor pair combines with the axial force to form a resultant force along a preset direction. This ensures that the rotor is only subjected to a resultant force in a single direction, thereby avoiding the impact of changes in the direction of the axial force on the operation of the rotor pair. Furthermore, since the rotor pair is only subjected to a resultant force in a single direction, to counteract this resultant force, a single-sided axial force limiting member is sufficient to ensure the normal operation of the rotor pair. Therefore, there is no need to set axial force limiting members at both ends of the first and second shafts, reducing the overall size of the compressor and lowering the manufacturing cost. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a cross-sectional view of a schematic structure of a rotor assembly provided in an embodiment of the present invention;

[0035] Figure 2 This is a cross-sectional view of another schematic structure of the rotor assembly provided in this embodiment of the invention;

[0036] Figure 3 This is a cross-sectional view of another schematic structure of the rotor assembly provided in this embodiment of the invention;

[0037] Figure 4 yes Figure 3 A magnified schematic diagram of part A in the middle;

[0038] Figure 5 This is a schematic diagram of an arrangement of the rotor assembly provided in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of a compressor provided in an embodiment of the present invention.

[0040] The labels in each figure represent:

[0041] 100 rotor assembly, 200 compressor;

[0042] 10 rotor pairs;

[0043] 11 First rotating shaft, 12 Second rotating shaft, 13 First rotor, 14 Second rotor, 15 First axis, 16 Second axis;

[0044] 131 First working part, 132 Second working part, 141 First sub-working part, 142 Second sub-working part;

[0045] 20 Axial force limiting component; 21 First thrust bearing; 22 Second thrust bearing;

[0046] 30 Bearing housing, 31 Bearing, 32 Circular groove;

[0047] 40 Motor assembly, 41 Motor rotor, 42 Motor stator;

[0048] F1 is the axial force, G is the gravity, G1 is the decomposition force of gravity, and F is the resultant force. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] In this invention, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this invention is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed herein.

[0052] This invention provides a rotor assembly 100, a compressor 200, and an air conditioning device, which will be described in detail below.

[0053] First, see Figure 1 , Figure 1 A schematic diagram of a rotor assembly 100 of the present invention is shown, wherein the rotor assembly 100 includes:

[0054] The rotor pair 10 includes a first rotor 13, which has a first working part 131 and a second working part 132 arranged coaxially and with opposite helical directions. The first rotor 13 is capable of rotating about a first axis 15 and generating an axial force F1 along the direction of the first axis 15. The direction of the gravity G of the first rotor is the same as the direction of the first axis 15, or the gravity G of the first rotor 13 has a gravity decomposition force G1 along the direction of the first axis 15.

[0055] The axial force F1 and multiple forces combine to form a resultant force F in a predetermined direction, wherein the multiple forces include the gravity G or the gravity decomposition force G1 of at least the first rotor 13 in the rotor pair.

[0056] It should be noted that, since the first working part 131 and the second working part 132 on the first rotor 13 in the rotor pair 10 are arranged with opposite spiral directions, during operation, the first working part 131 and the second working part 132 with opposite spiral directions generate two axial forces F1 in opposite directions. Ideally, the two axial forces F1 can completely cancel each other out. However, since the first working part 131 and the second working part 132 cannot be guaranteed to be the same in actual processing and assembly, and in actual operation, due to the unstable flow under start-up, shutdown and abnormal working conditions, the two axial forces F1 in opposite directions cannot be completely canceled out, and there is still a canceled axial force F1. The magnitude of the canceled axial force F1 fluctuates or even changes in direction, which can cause the rotor pair 10 to collide with or even be damaged by other components of the compressor. Therefore, it is necessary to set axial force limiting parts 20 (e.g., thrust bearings) on both sides of the rotor pair 10 to avoid this situation.

[0057] In this embodiment of the invention, the rotor assembly 100 is arranged vertically or inclined so that the direction of the gravity G of the rotor pair 10 is the same as the direction of the first axis 15, or the gravity G of the rotor pair 10 has a gravity decomposition force G1 along the direction of the first axis 15. During operation, when the axial force F1 of the rotor pair 10 is opposite to the direction of the gravity G or gravity decomposition force G1 of the rotor pair 10, the gravity G or gravity decomposition force G1 of the rotor pair 10 cancels out the axial force F1 to form a resultant force F along a preset direction, which can be a vertically downward direction or an inclined downward direction. When the axial force F1 of the rotor pair 10 is in the same direction as the gravity G or gravity decomposition force G1 of the rotor pair 10, the gravity G or gravity decomposition force G1 of the rotor pair 10 combines with the axial force F1 to form a resultant force F along the preset direction, so that the rotor pair 10 is only subjected to the resultant force F in a single direction, thereby avoiding the influence of the change in the direction of the axial force F1 on the operation of the rotor pair 10. Meanwhile, since the rotor pair 10 is only subjected to the resultant force F in a single direction, in order to counteract the resultant force F formed by the axial force F1 of the rotor pair 10 and the gravity G or gravity decomposition force G1 of the rotor pair 10 along the preset direction, an axial force limiting member 20 can be set on only one side of the rotor pair 10, thereby reducing the overall size of the compressor and reducing the manufacturing cost of the compressor.

[0058] Specifically, the rotor pair 10 is a working component that transports fluid by rotating at least one rotor, wherein the rotor pair 10 includes at least a first rotor 13. To ensure that the direction of the gravity G of the rotor pair 10 is the same as the direction of the first axis 15, or that the gravity G of the rotor pair 10 has a gravitational decomposition force G1 along the direction of the first axis 15, the first rotor 13 can be vertically or inclined, such that the gravity G of the first rotor 13 is vertically downward or the gravitational decomposition force G1 is along the direction of the first axis 15. The upward axial force F1 is counteracted by the gravity G or gravitational decomposition force G1 of at least the first rotor 13 in the rotor pair 10, thereby achieving the purpose of orienting the axial force of the rotor pair 10. It is understood that the orientation of the first rotor 13 can be set by a fixing device, such as a compressor housing or bearing housing 30.

[0059] Furthermore, in order to better cancel out the two axial forces F1 generated by the first rotor 13, in some embodiments of the present invention, the first working part 131 conveys fluid along a first direction, and the second working part 132 conveys fluid along a second direction, wherein the first direction and the second direction are opposite directions.

[0060] As an example, such as Figure 1As shown, fluid enters the first rotor 13 from the middle between the first working part 131 and the second working part 132. The first working part 131 conveys fluid downwards, and the second working part 132 conveys fluid upwards. Since the directions of fluid delivery are opposite, the two axial forces F1 generated by the first rotor 13 are both along the axis of the first rotor 13, and both axial forces F1 point towards the middle of the first rotor 13. This causes the two axial forces F1 generated by the first rotor 13 to cancel each other out towards the middle, ensuring the effect of canceling out the axial forces F1. Furthermore, since the fluid enters from the upper and lower ends of the first rotor 13 in opposite directions, the low pressure generated at the upper end of the first rotor 13 is insufficient to drive the fluid upwards to enter from the upper end. This avoids the problem of unbalanced axial forces F1 caused by the upper part of the first rotor 13 spinning idly. The upper part of the first rotor 13 only points towards the middle. Figure 1 The second working part 132 is shown.

[0061] To ensure that the first working part 131 of the first rotor 13 delivers fluid downwards and the second working part 132 of the first rotor 13 delivers fluid upwards, as an example, the first working part 131 has right-handed helical blades, and the second working part 132 has left-handed helical blades. The rotation direction of the first rotor 13 is counterclockwise. During operation, the first rotor 13 rotates counterclockwise. Since the first working part 131 has right-handed helical blades, according to the right-hand rule and the left-hand rule for determining the direction of fluid delivery, it can be determined that the first working part 131 delivers fluid downwards, and conversely, the second working part 132 delivers fluid upwards.

[0062] As another example, the first working part 131 has a left-handed helical blade, the second working part 132 has a right-handed helical blade, and the first rotor 13 rotates clockwise. During operation, the first rotor 13 rotates clockwise. Since the first working part 131 has a left-handed helical blade, according to the right-hand rule and the left-hand rule for determining the direction of fluid transport, it can be determined that the first working part 131 transports fluid downwards, and conversely, the second working part 132 transports fluid upwards.

[0063] To achieve better gas compression and delivery, in some embodiments of the present invention, the rotor pair 10 may further include a second rotor 14, which is rotatable about a second axis 16. Specifically, the second rotor 14 meshes with the first rotor 13. The second rotor 14 has a first sub-working portion 141 and a second sub-working portion 142. The first sub-working portion 141 meshes with the first working portion 131 and is arranged in opposite helical directions. The second sub-working portion 142 meshes with the second working portion 142 and is arranged in opposite helical directions. The multiple forces forming the resultant force F with the axial force F1 may also include the gravity G of the second rotor 14 in the rotor pair 10 or the gravity decomposition force G1 along the first axis 15, so as to utilize the gravity G of the second rotor 14 to counteract the upward axial force F1.

[0064] During operation, the first rotor 13 drives the second rotor 14 to rotate. The first sub-working part 141 and the first working part 131 form a pair of working parts for conveying fluid, and the second sub-working part 142 and the second working part 132 form another pair of working parts for conveying fluid. The first working part 131 and the first sub-working part 141, which are arranged with opposite spiral directions, generate an axial force F1, while the second working part 132 and the second sub-working part 142, which are arranged with opposite spiral directions, generate another axial force F1 in the opposite direction to the axial force F1. The two axial forces F1 cancel each other out, thereby achieving a general balance of the axial forces F1 when the rotor pair 10 includes two rotors.

[0065] Understandably, when the rotor pair 10 includes a first rotor 13 and a second rotor 14, in order to better cancel out the two axial forces F1 generated by the first rotor 13 and the second rotor 14, the first working part 131 cooperates with the first sub-working part 141 to transport fluid along a first direction, and the second working part 132 cooperates with the second sub-working part 142 to transport fluid along a second direction, wherein the first direction and the second direction are opposite. To achieve flow in opposite directions, this can be achieved by setting the helical direction of the first working part 131 and the second working part 132 on the first rotor 13. For details, please refer to the descriptions of other embodiments in this application, which will not be repeated here.

[0066] Furthermore, to ensure reliable rotation of the first rotor 13 and the second rotor 14, the rotor pair 10 also includes a first shaft 11 and a second shaft 12; the first shaft 11 carries the first working part 131 and the second working part 132; the second shaft 12 carries the first sub-working part 141 and the second sub-working part 142, so that the first rotor 13 can rotate around the first axis 15 with the first shaft 11, and the second rotor 14 can rotate around the second axis 16. The multiple forces that form the resultant force F with the axial force F1 may also include the gravity G of the first shaft 11 and the second shaft 12 or the gravity decomposition force G1 along the direction of the first axis 15, so as to utilize and counteract the upward axial force F1 by utilizing the gravity G of the first shaft 11 and the second shaft 12.

[0067] In some embodiments of the present invention, the first rotor 13 can be assembled with the first rotating shaft 11, for example, by key connection. In other embodiments, the first rotor 13 can be integrally formed with the first rotating shaft 11, for example, the first working part 131 is integrally formed with the first rotating shaft 11, and the second working part 132 is assembled with the first rotating shaft 11; or, for example, the first working part 131 and the second working part 132 of the first rotor 13 are integrally formed with the first rotating shaft 11. It is understood that the second rotor 14 can be integrally formed with the second rotating shaft 12, or the second rotor 14 can be assembled with the second rotating shaft 12; this will not be elaborated further here.

[0068] In some embodiments of the present invention, in order to facilitate the balancing of the axial force F1 generated by the rotor pair 10, the rotor assembly 100 further includes an axial force limiting member 20, which is connected to the first rotating shaft 11 and / or the second rotating shaft 12, and is used to counteract the resultant force F generated by the rotor pair 10 in a preset direction during operation.

[0069] For example, the axial force limiting member 20 can be a thrust bearing, such as an angular contact ball bearing, a thrust ball bearing, a thrust cylindrical roller bearing, a thrust needle roller bearing, a thrust tapered roller bearing, and a thrust self-aligning roller bearing. It is understood that the axial force limiting member 20 can also be other working parts that can counteract the axial force, such as a balance drum or balance disc.

[0070] As an example, such as Figure 2 As shown, Figure 2 This diagram illustrates another structural embodiment of the rotor assembly 100 of the present invention. The axial force limiting member 20 may consist solely of a first thrust bearing 21 disposed on the first rotating shaft 11. The first thrust bearing 21, rotatably connected to the first rotating shaft 11, counteracts the resultant force F along a predetermined direction. For example, the first thrust bearing 21 may be located at the end of the first rotating shaft 11 opposite to the predetermined direction, such as... Figure 2 As shown, the axial force limiting member 20 is located at the upper end of the first rotating shaft 11. Since the axial force F1 of the rotor on 10 and the gravity G are always a downward resultant force F, the first thrust bearing 21 located at the upper end of the first rotating shaft 11 can pull the first rotating shaft 11 upward, thereby making the overall force on 10 zero and ensuring the normal operation of the rotor on 10. It can be understood that the first thrust bearing 21 can also be located at the end of the first rotating shaft 11 that is in the same direction as the preset direction, for example, as... Figure 1 The lower end of the first rotating shaft 11 shown.

[0071] As will be understood by those skilled in the art, in order for the first thrust bearing 21 to counteract the axial resultant force F, the installation direction of the first thrust bearing 21 is related to the bearing type. For example, the first thrust bearing 21 can be a bearing that carries unidirectional axial force. Taking an angular contact ball bearing as an example, when the first thrust bearing 21 is located at the upper end of the first shaft 11, the side of the outer ring with the wider side facing away from the first rotor 13 must face the first rotor 13, while the side of the outer ring with the narrower side facing away from the first rotor 13 must face away from the first rotor 13, so that the angular contact ball bearing located at the upper end of the first shaft 11 can counteract the downward resultant force F; conversely... When the first thrust bearing 21 is located at the lower end of the first rotating shaft 11, the narrow side of the outer ring of the angular contact ball bearing must face the first rotor 13, and the wide side of the outer ring must face away from the first rotor 13, so that the angular contact ball bearing located at the lower end of the first rotating shaft 11 can counteract the downward resultant force F. For example, the first thrust bearing 21 can be a bearing that carries bidirectional axial force. Taking the first thrust bearing 21 as a bidirectional thrust ball bearing as an example, since the bidirectional thrust ball bearing can carry bidirectional axial loads, the installation position of the first thrust bearing 21 can be determined according to the requirements without determining the installation direction.

[0072] In some embodiments of the present invention, for example, for an embodiment where the axial force limiting member 20 only includes a first thrust bearing 21 disposed on a first rotating shaft 11, the first rotating shaft 11 drives the first rotor 13 to rotate, and the second rotor 14 meshing with the first rotor 13 rotates around the second rotating shaft 12. Since the second rotor is a driven member and the second rotating shaft is not fitted with a thrust bearing, a non-metallic material such as PEEK material can be used for the second rotor 12 to avoid damage caused by collision between the second rotor 12 and the compressor housing or other components.

[0073] Understandably, the axial force limiting member 20 can also be simultaneously provided on the first rotating shaft 11 and the second rotating shaft 12, for example... Figure 2 As shown, the axial force limiting member 20 may include a first thrust bearing 21 disposed on the first rotating shaft 11 and a second thrust bearing 22 disposed on the second rotating shaft 12, so as to counteract the effect of the resultant force F formed by multiple forces along a preset direction through the two thrust bearings.

[0074] In other embodiments of the present invention, the axial force limiting member 20 may be rotatably connected to only one end of the second rotating shaft 12. The axial force limiting member 20, rotatably connected to the second rotating shaft 12, can counteract the resultant force F along a preset direction. Specifically, the axial force limiting member 20 may be located at the end of the second rotating shaft 12 opposite to the preset direction. For example, the axial force limiting member 20 may be located at the upper end of the second rotating shaft 12. Since the axial force F1 of the rotor pair 10 and the gravity G are always a downward resultant force F, the axial force limiting member 20 located at the upper end of the second rotating shaft 12 can pull the second rotating shaft 12 upward, so that the overall force on the rotor pair 10 is 0, ensuring the normal operation of the rotor pair 10.

[0075] As another example, see Figure 3 , Figure 3 This diagram illustrates another structural embodiment of the rotor assembly 100 of the present invention, wherein the axial force limiting member 20 is a ball bearing. The ball bearing is in rotatable contact with the lower end of the second rotating shaft 12, that is, by the ball bearing pressing upward against the lower end of the second rotating shaft 12, the combined force F of the rotor's axial force F1 and gravity G on the rotor is counteracted. For details, please refer to... Figure 4 , Figure 4 It shows Figure 3 The enlarged schematic diagram of part A shows that the ball bearing is located at the bottom of the circular groove 32 of the bearing housing 30. The lower end of the second rotating shaft 12 extends into the circular groove 32 of the bearing housing 30 and makes rotational contact with the ball bearing. When the second rotating shaft 12 rotates, the ball bearing is confined to rotate within the circular groove 32, thus achieving the effect of counteracting the resultant force F in the preset direction while ensuring the stability of the rotation of the second rotating shaft 12. It can be understood that there can be multiple ball bearings or a single ball bearing; no specific limitation is made here.

[0076] In some embodiments of the present invention, in order to ensure that the gravity G or the gravitational decomposition force G1 of the rotor on 10 can completely counteract the upward axial force F1 of the rotor on 10, please refer to [reference needed]. Figure 5 , Figure 5 A schematic diagram of one arrangement of rotor assembly 100 is shown, wherein rotor pair 10 can satisfy the following relationship:

[0077] m≥f / (sinα*g)

[0078] Where m is the mass of rotor 10; f is the maximum axial force when rotor 10 transports fluid; α is the angle between the axis of the first rotor 13 and the horizontal plane; and g is the acceleration due to gravity.

[0079] Generally, in actual operation, the maximum axial force F1 of the rotor pair 10 when conveying fluid is around 100N. Therefore, when the rotor pair 10 is set vertically, the mass of the rotor pair 10 can be 10 kg, but it is not limited to this. For example, when the lower end of the rotor pair 10 is connected to other devices (such as motor assembly 40), the mass of the rotor pair 10 can be further reduced by the mass of the other devices according to the formula.

[0080] In some embodiments of the present invention, in order to achieve fixation of the rotor pair 10, such as... Figure 1 As shown, the screw assembly can also be connected to the bearing housing 30. The upper and lower ends of the first rotating shaft 11 are respectively installed in conjunction with the bearing housing 30 through bearings 31. The upper and lower ends of the second rotating shaft 12 are respectively installed on the bearing housing 30. Generally, the second rotating shaft 12 can be rotatably connected to the bearing housing 30 through the bearings 31 to facilitate the rotation of the second rotating shaft 12 and the second rotor 14. It can be understood that the second rotating shaft 12 can also be fixedly connected to the bearing housing 30, and a bearing 31 is added between the second rotating shaft 12 and the second rotor 14 to realize the rotation of the second rotor 14.

[0081] To better implement the rotor assembly 100 in the embodiments of the present invention, such as Figure 6 As shown, Figure 6 A schematic diagram of a compressor 200 is shown. Based on the rotor assembly 100, this embodiment of the invention also provides a compressor 200, wherein the compressor 200 includes the rotor assembly 100 and the motor assembly 40 of any of the above embodiments.

[0082] The motor assembly 40 includes a motor rotor 41 and a motor stator 42 arranged coaxially. The motor rotor 41 is coaxially connected to the first rotor 13 of the rotor assembly 100. The motor stator 42 generates a magnetic field to drive the motor rotor 41 to rotate the first rotor 13.

[0083] Specifically, the first rotor 13 and the motor rotor 41 can be connected via the first shaft 11. For example, the first rotor 13 is located at the upper end of the first shaft 11, while the motor rotor 41 is located at the lower end of the first shaft 11. Understandably, since the motor assembly 40 is directly connected to the first rotor 13, the multiple forces that form the resultant force F with the axial force F1 can also include the gravity G of the motor assembly 40 or the gravitational decomposition force G1 along the first axis.

[0084] As an example, the motor assembly 40 is located at the end of the first rotor 13 that is in the same direction as a preset direction, for example, as shown in the image. Figure 6As shown, the motor assembly 40 is located at the lower end of the first rotor 13. The first rotor 13, due to its own gravity, can maintain a stable connection with the motor rotor 41, preventing the first rotor 13 from detaching from the motor rotor 41. As another example, the motor assembly 40 is located at the end of the first rotor 13 opposite to a predetermined direction, for example, at the upper end of the first rotor 13. Since the motor assembly 40 is located at the upper end of the first shaft 11, fluid is less likely to flow into the motor assembly 40 along the first rotor 13 due to gravity, thus preventing damage to the motor assembly 40.

[0085] When the motor assembly 40 is powered on, the motor stator 42 generates a magnetic field, and the motor rotor 41 is driven by the magnetic field to drive the first rotor 13 to rotate, thereby achieving the purpose of the rotor rotating the first rotor 13 and the second rotor 14 in 10.

[0086] Furthermore, in order to better implement the compressor 200 in the embodiments of the present invention, based on the compressor 200, the embodiments of the present invention also provide an air conditioning device, which includes the rotor assembly 100 or the compressor 200 of any of the above embodiments.

[0087] It is worth noting that the above description of the rotor assembly 100 is only to clearly illustrate the verification process of the present invention. Under the guidance of the present invention, those skilled in the art can make equivalent modifications to the above assembly. For example, axial force limiting members 20 can be provided at the same end of the first shaft 11 and the second shaft 12 at the same time, so that the axial force F1 of the rotor on 10 can be better balanced by the two axial force limiting members 20.

[0088] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0089] The basic concepts have been described above. It is clear that the detailed disclosure above is merely illustrative and does not constitute a limitation of the present invention. Although not explicitly stated herein, various modifications, improvements, and corrections may be made to the present invention by those skilled in the art. Such modifications, improvements, and corrections are suggested in this invention and therefore remain within the spirit and scope of the exemplary embodiments of the present invention.

[0090] Meanwhile, specific terms are used to describe embodiments of the invention. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the invention. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the invention can be appropriately combined.

[0091] It should be noted that, in order to simplify the description of this invention and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of this invention sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the invention requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiment disclosed above.

[0092] The rotor assembly, compressor, and air conditioning equipment provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A rotor assembly, characterized in that, include: The rotor pair includes a first rotor, a first shaft, and a second shaft. The first rotor has a first working part and a second working part arranged coaxially and with opposite helical directions. The first rotor is capable of rotating about a first axis and generating an axial force along the direction of the first axis. The direction of gravity of the first rotor is the same as the direction of the first axis, or the gravity of the first rotor has a gravitational decomposition force along the direction of the first axis. The axial force and multiple forces form a resultant force along a preset direction, wherein the multiple forces include at least the gravity of the first rotor in the rotor pair or the gravitational decomposition force. The first and second working parts, which are arranged with opposite spiral directions, generate two axial forces in opposite directions that do not completely cancel each other out. An axial force limiting member is connected to the first rotating shaft and / or the second rotating shaft to counteract the resultant force along the preset direction.

2. The rotor assembly as claimed in claim 1, characterized in that, The rotor pair also includes a second rotor, which is rotatable about a second axis; The second rotor has a first sub-working part and a second sub-working part, the first sub-working part meshing with the first working part and arranged in opposite helical directions, and the second sub-working part meshing with the second working part and arranged in opposite helical directions; The plurality of forces that form the resultant force with the axial force also include the gravity of the second rotor in the rotor pair or the gravitational decomposition force along the first axis.

3. The rotor assembly as claimed in claim 2, characterized in that, The rotor pair also includes a first rotating shaft and a second rotating shaft; The first rotating bearing carries the first working part and the second working part; The second rotating bearing carries the first sub-working part and the second sub-working part; The plurality of forces that form the resultant force with the axial force also include the gravity of the first shaft and the second shaft or the gravitational decomposition force along the direction of the first axis.

4. The rotor assembly as claimed in claim 1, characterized in that, The axial force limiting component includes a first thrust bearing disposed on the first rotating shaft and / or a second thrust bearing disposed on the second rotating shaft.

5. The rotor assembly as claimed in claim 2, characterized in that, The first rotating shaft drives the first rotor to rotate, and the second rotor, which meshes with the first rotor, rotates around the second rotating shaft; The axial force limiting component includes a first thrust bearing disposed on the first rotating shaft; The second rotor is made of non-metallic material.

6. The rotor assembly as claimed in any one of claims 1 to 5, characterized in that, The mass of the rotor pair satisfies the following relationship: Where m is the mass of the rotor pair; f is the maximum axial force of the rotor pair when transporting fluid; α is the angle between the first axis and the horizontal plane; and g is the acceleration due to gravity.

7. A compressor, characterized in that, Includes the rotor assembly and motor assembly as described in any one of claims 1 to 6; The motor assembly includes a motor rotor and a motor stator arranged coaxially. The motor rotor is coaxially connected to the first rotor of the rotor assembly. The motor stator generates a magnetic field to drive the motor rotor to rotate the first rotor. The plurality of forces that form the resultant force with the axial force also include the gravity of the motor assembly or the gravitational decomposition force along the first axis.

8. The compressor as claimed in claim 7, characterized in that, The motor assembly is located at the end of the first rotor opposite to the preset direction; or The motor assembly is located at the end of the first rotor that is in the same direction as the preset direction.

9. An air conditioning device, characterized in that, Includes the rotor assembly as described in any one of claims 1 to 6 or the compressor as described in any one of claims 7 to 8.

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