Compressor rotor, compressor and refrigerant circulation system

Abstract

The present disclosure provides a compressor rotor, a compressor and a refrigerant circulation system. The compressor rotor includes: a motor rotor, including a plurality of rotor segments fixedly connected in the axial direction, the plurality of rotor segments having an axial through hole; a locking rod, passing through the axial through hole; a compression unit rotating part, located at the end of the motor rotor and connected to the locking rod; and a locking component, locking the compression unit rotating part to the locking rod, the locking rod, the compression unit rotating part and the locking component forming a clamping structure that applies axial pressure to the motor rotor toward the inside. The compressor rotor of the present disclosure can make the connection between the rotor segments of the motor rotor having a plurality of rotor segments more reliable and firm while processing the motor rotor in segments.

Description

Technical Field

[0001] The present disclosure relates to the technical field of compressors and refrigeration, and in particular to a compressor rotor, a compressor and a refrigerant circulation system. Background Art

[0002] Compressors, especially high-speed compressors such as centrifugal compressors, have compressor rotors that rotate at high speeds during operation and require reliable bearings to support the rotors. Normally, the bearings used for compressor rotors of compressors are rolling bearings or oil film bearings. Due to the high load-bearing capacity of rolling bearings and oil film bearings, the motor rotors used in compressors are generally one-piece structures. The weight of the compressor rotors with this one-piece structure is relatively heavy, which is not conducive to improving the critical speed of the rotor. When making larger compressor rotors, the processing process of the one-piece motor rotor is relatively complicated, and the equipment requirements are relatively high, which will increase costs. For fluid systems, such as compressors in refrigerant circulation systems, when rolling bearings or oil film bearings are used, the compressor requires an additional oil lubrication system and a complex oil supply oil circuit system, and an oil separation system needs to be added to the refrigerant circulation system, which will make the refrigerant circulation system more complicated and large. Summary of the invention

[0003] The object of the present disclosure is to provide a compressor rotor, a compressor and a refrigerant circulation system.

[0004] A first aspect of the present disclosure provides a compressor rotor, comprising:

[0005] The motor rotor comprises a plurality of rotor segments fixedly connected in the axial direction, wherein the plurality of rotor segments have axial through holes;

[0006] A locking rod passing through the axial through hole;

[0007] A compression unit rotating portion, located at the end of the motor rotor and connected to the locking rod; and

[0008] The locking component locks the compression unit rotating part onto the locking rod, and the locking rod, the compression unit rotating part and the locking component form a compression structure that applies axial pressure to the motor rotor toward the inside.

[0009] In some embodiments, the compression unit rotating portion and the locking component are respectively disposed at both ends of the locking rod.

[0010] In some embodiments,

[0011] The end of the locking rod is provided with an external thread;

[0012] The locking component includes a locking nut matched with the external thread.

[0013] In some embodiments, the axial through hole comprises:

[0014] Small trail segments; and

[0015] The large diameter section has a diameter greater than that of the small diameter section.

[0016] In some embodiments, the locking rod comprises:

[0017] A rod body having a clearance fit with the small diameter section; and

[0018] The protrusion is arranged on the rod body and protrudes radially outward from the rod body. The protrusion is clearance-matched with the large-diameter section.

[0019] In some embodiments, the protrusion is a protruding ring.

[0020] In some embodiments,

[0021] The axial middle portion of the motor rotor includes a permanent magnet, the small diameter section is located in the axial middle portion of the axial through hole, and the two large diameter sections are respectively located at two ends of the axial through hole;

[0022] The locking rod comprises two protrusions, and the two protrusions are respectively matched with the two large-diameter sections.

[0023] In some embodiments,

[0024] One of the two protrusions is a fixed protrusion fixed to the rod body, and the other is a movable protrusion movable relative to the rod body; or,

[0025] The two protrusions are both movable protrusions that are movable relative to the rod body.

[0026] In some embodiments, the movable protrusion cooperates with the inner wall of the axial through hole via a key to limit the circumferential position of the movable protrusion.

[0027] In some embodiments, a shaft shoulder is provided on the rod body, and the movable protrusion is located between an end surface of one end of the motor rotor and the shaft shoulder.

[0028] In some embodiments, the compression unit rotating part at one end of the motor rotor where the movable protrusion is located includes an axial boss extending into the axial through hole, and the movable protrusion is axially limited between the shaft shoulder and the end face of the axial boss.

[0029] In some embodiments, the fitting clearance between the fixing protrusion and the corresponding large-diameter section is smaller than the fitting clearance between the rod body and the small-diameter section.

[0030] In some embodiments,

[0031] The movable protrusion is interference-fitted with the corresponding large-diameter section; and / or,

[0032] The movable protrusion is loosely matched with the rod body.

[0033] In some embodiments, the plurality of rotor segments comprises:

[0034] permanent magnet;

[0035] A first end shaft segment, fixedly disposed at one end of the permanent magnet; and

[0036] The second end shaft segment is fixedly arranged at the other end of the permanent magnet.

[0037] In some embodiments, the compression unit rotating portion includes a centrifugal impeller.

[0038] A second aspect of the present disclosure provides a compressor, comprising the compressor rotor described in the first aspect of the present disclosure.

[0039] In some embodiments, the compressor includes a gas bearing on which the compressor rotor is supported.

[0040] A third aspect of the present disclosure provides a refrigerant circulation system, comprising the compressor described in the second aspect of the present disclosure.

[0041] Based on the compressor rotor provided by the present invention, its motor rotor includes multiple rotor segments fixedly connected along the axial direction, and a locking rod is inserted into the inside of the motor rotor. The locking rod, the compression unit rotating part and the locking component form a clamping structure that applies pressure axially inward to the motor rotor. While the motor rotor can be processed in sections, the connection between the rotor segments of the motor rotor with multiple rotor segments can be made more reliable and firm.

[0042] The compressor and refrigerant circulation system provided by the present disclosure have the advantages of the compressor rotor provided by the present disclosure.

[0043] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0045] Figure 1 The figure is a schematic diagram of the structure of a compressor rotor according to an embodiment of the present invention.

[0046] Figure 2 for Figure 1A schematic cross-sectional structural diagram of the motor rotor of the compressor rotor of the illustrated embodiment.

[0047] Figure 3 for Figure 1 A schematic structural diagram of the movable protrusion of the locking rod of the compressor rotor in the illustrated embodiment. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0049] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0051] In the description of the present disclosure, it needs to be understood that various directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc., are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words 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 cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0052] like Figures 1 to 3As shown, an embodiment of the present disclosure provides a compressor rotor, which includes a motor rotor 10, a locking rod 20, a compression unit rotating part and a locking component.

[0053] like Figure 1 As shown, the motor rotor 10 includes a plurality of rotor segments fixedly connected in the axial direction, and the plurality of rotor segments have an axial through hole 15. The locking rod 20 passes through the axial through hole 15. The compression unit rotating part is located at the end of the motor rotor 10 and is connected to the locking rod 20. The locking component locks the compression unit rotating part to the locking rod 20. The locking rod, the compression unit rotating part and the locking component form a compression structure that applies pressure toward the axial inner side to the motor rotor 10.

[0054] In the compressor rotor disclosed in the present invention, the motor rotor 10 includes a plurality of rotor segments fixedly connected along the axial direction, and a locking rod 20 is passed through the inside of the motor rotor 10. The locking rod, the compression unit rotating part and the locking component form a clamping structure for applying axial pressure inward to the motor rotor 10. While the motor rotor 10 can be processed in sections, the connection between the rotor segments of the motor rotor 10 having multiple rotor segments can be made more reliable and firm.

[0055] like Figure 1 As shown, in some embodiments, the compressor may be a centrifugal compressor, and the compression unit rotating part is a centrifugal impeller of the centrifugal compressor. The compression unit rotating part may be arranged only on one side of the motor rotor, or on both sides of the motor rotor. The compression unit rotating part on each side may be single-stage or multi-stage. For example, when the compression unit rotating part is an impeller, the number of impellers on one side of the motor rotor may be one or more than two.

[0056] In some embodiments, both ends of the locking rod 20 are respectively connected to the rotating part of the compression unit.

[0057] In some embodiments, an end of the locking rod 20 is provided with an external thread, and the locking component includes a locking nut that cooperates with the external thread of the locking rod 20 .

[0058] like Figure 1 As shown, in some embodiments, the compressor rotor includes a motor rotor 10, a first-stage centrifugal impeller 30 and a second-stage centrifugal impeller 50. The left and right ends of the locking rod 20 are respectively provided with external threads. The first-stage centrifugal impeller 30 is locked to the left end of the locking rod 20 by a first locking nut 40 as a locking component. The second-stage centrifugal impeller 50 is locked to the right end of the locking rod 20 by a second locking nut 60 as a locking component.

[0059] like Figure 1 and Figure 2 As shown, in some embodiments, the axial through hole 15 includes a small diameter section 151 and a large diameter section having a diameter greater than that of the small diameter section 151 .

[0060] The axial through hole 15 includes a small diameter section 151 and a large diameter section whose diameter is larger than the small diameter section 151. The motor rotor can be made into a hollow structure as much as possible according to the properties of each rotor section of the motor rotor 10, thereby helping to reduce the overall weight of the motor rotor 10 and the compressor rotor, and helping to increase the critical speed of the compressor rotor.

[0061] In some embodiments, the locking rod 20 includes a rod body 21 and a protrusion. The rod body 21 cooperates with the small diameter section 151 of the axial through hole 15. The protrusion is arranged on the rod body 21, protruding radially outward from the rod body 21, and cooperates with the large diameter section of the axial through hole 15.

[0062] The protrusion can improve the overall rigidity of the locking rod 20 without increasing the overall weight of the compressor rotor too much, thereby facilitating the dynamic balance of the compressor rotor.

[0063] In some embodiments, the protrusion is a convex ring, which can provide support for the rod body 21 at various circumferential positions, thereby facilitating the dynamic balance of the compressor rotor.

[0064] In some embodiments, the axial middle portion of the motor rotor 10 includes a permanent magnet 11, the small diameter section 151 is located in the axial middle portion of the axial through hole 15, and the two large diameter sections are located at both ends of the axial through hole 15. Figure 1 and Figure 2 As shown, the two large diameter sections are respectively a first large diameter section 152 located at the left end of the motor rotor and a second large diameter section 153 located at the right end of the motor rotor 10 .

[0065] For a motor rotor 10 having multiple rotor segments, the axial middle portion is generally where the permanent magnet is set. By setting a small diameter segment in this portion, the influence of setting the axial through hole on the permanent magnet can be reduced. The axial ends of the motor rotor 10 are non-magnetic bodies. By setting a large diameter segment in this portion, the overall weight of the motor rotor and the compressor rotor can be reduced, thereby facilitating the increase of the critical speed of the compressor rotor.

[0066] like Figure 1 As shown, the locking rod 20 includes two protrusions, and the two protrusions are respectively matched with the two large diameter sections. This arrangement is beneficial to improving the overall rigidity of the locking rod 20, thereby facilitating the dynamic balance of the compressor rotor.

[0067] like Figure 1 As shown, one of the two protrusions is a fixed protrusion 22 fixed to the rod body 21, and the other is a movable protrusion 23 movable relative to the rod body 21. The fixed protrusion 22 and the movable protrusion 23 are respectively provided to facilitate the assembly of the locking rod 20 and the motor rotor 10.

[0068] like Figure 1In the illustrated embodiment, the fixed protrusion 22 cooperates with the first large diameter section 152 , and the movable protrusion 23 cooperates with the second large diameter section 153 .

[0069] In some embodiments not shown in the figures, both of the two protrusions may be movable protrusions that are movable relative to the rod body.

[0070] In some embodiments, the movable protrusion 23 is key-matched with the inner wall of the axial through hole 15 to limit the circumferential position of the movable protrusion 23 relative to the axial through hole 15 .

[0071] like Figures 1 to 3 As shown, a keyway 1531 is provided on the hole wall of the second large diameter section 153, and a key 232 is provided on the outer periphery of the movable protrusion 23. When the central hole 231 of the movable protrusion 23 is inserted between the rod body 21 which has been penetrated into the axial through hole 15 of the motor rotor 10 and the inner wall of the second large diameter section 153, the key 232 cooperates with the keyway 1531, and the circumferential position of the movable protrusion 23 is limited.

[0072] Figures 1 to 3 Only the square key is shown in the figure. In the embodiment not shown in the figure, the key can also be fixed on the motor rotor and a groove is provided on the movable protrusion; the key can also be independent, and a key groove is provided on the motor rotor 10 and the movable protrusion respectively. The key is not limited to the square key, and can also be a round key, a semicircular key or a spline.

[0073] like Figure 1 As shown, in some embodiments, a shaft shoulder is provided on the rod body 21, and the movable protrusion 23 is located between the end surface of one end of the motor rotor 10 and the shaft shoulder. For example, the movable protrusion 23 can be against the shaft shoulder. This arrangement is conducive to limiting the axial position of the movable protrusion 23 and ensuring the stability of the rigidity of the locking rod 20.

[0074] In some embodiments, the compression unit rotating part at one end of the motor rotor 10 where the movable protrusion 23 is located includes an axial boss extending into the axial through hole 15, and the movable protrusion 23 is axially limited between the aforementioned shaft shoulder and the end face of the axial boss.

[0075] like Figure 1 As shown, the left end of the second centrifugal impeller 50 has an axial boss, the outer periphery of which cooperates with the inner wall of the right end of the second large diameter section 153, and the left end face of the axial boss and the shaft shoulder on the rod body 21 can limit the axial position of the movable protrusion 23 within a certain range. When the distance between the left end face of the axial boss and the shaft shoulder is set equal to or slightly larger than the distance between the axial ends of the movable protrusion 23, the axial position of the movable protrusion 23 is basically determined, which is conducive to ensuring the stability of the rigidity of the locking rod 20, thereby facilitating the dynamic balance of the compressor rotor.

[0076] In some embodiments, the matching clearance between the fixing protrusion 22 and the corresponding large diameter section is smaller than the matching clearance between the rod body 21 and the small diameter section 151. This arrangement facilitates the rapid assembly of the compressor rotor.

[0077] In some embodiments, the movable protrusion 23 is interference-fitted with the corresponding large-diameter section; the movable protrusion 23 is clearance-fitted with the rod body 21. This arrangement facilitates rapid assembly of the compressor rotor.

[0078] like Figure 1 As shown, in some embodiments, the plurality of rotor segments of the motor rotor 10 include a permanent magnet 11, a first end shaft segment 12, and a second end shaft segment 13. The first end shaft segment 12 is fixedly disposed at one end of the permanent magnet 11. The second end shaft segment 13 is fixedly disposed at the other end of the permanent magnet 11.

[0079] The permanent magnet 11 may be a hollow cylinder with an axial through hole. The permanent magnet 11 serves as the motor rotor 10 and together with the motor stator of the compressor constitutes a motor that drives the compressor rotor to rotate. The material of the permanent magnet 11 is, for example, magnetic steel.

[0080] like Figure 1 As shown, in some embodiments, the motor rotor 10 further includes a mounting sleeve 14 integrally provided at one end of the first end shaft segment 12 close to the permanent magnet 11. The permanent magnet 11 and the second end shaft segment 13 are fixedly mounted in the mounting sleeve 14 by shrink fitting.

[0081] In some embodiments not shown in the figure, an independent mounting sleeve may be provided, and the first end shaft segment, the permanent magnet and the second end shaft segment are all mounted in the mounting sleeve by means of shrink fitting.

[0082] The following combination Figures 1 to 3 Some embodiments of the present disclosure are described in more detail.

[0083] like Figures 1 to 3 As shown, the motor rotor 10 of the compressor rotor of the embodiment of the present disclosure includes three rotor segments, namely, a permanent magnet 11, a first end shaft segment 12 and a second end shaft segment 13, and a mounting sleeve 14. The left end of the mounting sleeve 14 is integrally arranged with the right end of the first end shaft segment 12. The first end shaft segment 12, the second end shaft segment 13 and the permanent magnet 11 are all processed into a hollow structure with an axial through hole. The second end shaft segment 13 is similar in structure to the first end shaft segment 12 but is symmetrically arranged, and the left end of the second end shaft segment 13 is in the form of a step, which is conducive to the equal outer diameter of the motor rotor 10 after the three rotor segments are connected.

[0084] Each rotor section is processed separately and ensures reasonable accuracy, and then assembled to form the motor rotor 10. During the assembly process of the motor rotor 10, the permanent magnet 11 and the second end shaft section 13 are first glued together. Then the first end shaft section 12 and the mounting sleeve 14 are heated to a higher temperature, such as 700-900°C, and then the permanent magnet 11 and the second end shaft section 13 are quickly inserted into the mounting sleeve 14. This method can shorten the time of the shrink-fit interference connection and improve the success rate of assembly. Since the motor rotor 10 is subjected to the centrifugal force during the high-speed rotation process, there is a phenomenon of material expansion. In order to prevent the parts from loosening after the interference is reduced, the interference should be larger.

[0085] Since the three rotor sections are all hollow structures, the gas generated during the shrink-fit process can be discharged from the axial through hole 15 without adding additional exhaust holes, which facilitates processing and helps improve the production efficiency of the motor rotor 10.

[0086] The diameter of the axial through hole inside the permanent magnet 11 is substantially the same as the diameter of the corresponding rod section of the rod body 21 of the locking rod 20. Considering the properties of the permanent magnet material, the diameter of the axial through hole inside the permanent magnet 11 is preferably 1 / 4 to 1 / 3 times the outer diameter of the permanent magnet. Figure 1 As shown, the axial through hole inside the permanent magnet 11 constitutes a part of the small diameter section 151 of the axial through hole 15 of the motor rotor 10 .

[0087] The axial through hole inside the permanent magnet 11 and the corresponding rod section of the rod body 21 are clearance-matched, and the clearance can be, for example, 0.03-0.05 mm. The roughness of the surface where the axial through hole of the permanent magnet 11 contacts the rod body 21 can be 0.8-1.6 μm, and this roughness range is conducive to preventing the surface peak from affecting the assembly.

[0088] Since the wall thickness of the installation sleeve is relatively thin, there will be a certain degree of strength problem after the interference connection. Using a locking rod 20 in the radial middle of the motor rotor 20 can increase the connection reliability.

[0089] Considering that the length of the locking rod 20 is relatively long, which will affect its rigidity and strength, a fixed protrusion 22 in the form of a supporting positioning step is processed at its left end to increase rigidity so as to reduce the deflection of the locking rod 20. The fixed protrusion 22 is clearance-matched with the first large diameter section 152. The clearance between the fixed protrusion 22 and the first large diameter section 152 can be smaller than the clearance between the permanent magnet 11 and the corresponding rod section 21 of the locking rod 20. The clearance between the fixed protrusion 22 and the first large diameter section 152 can be, for example, 0.01 to 0.03 mm.

[0090] The right end of the locking rod 20 is radially positioned by a movable protrusion 23. The central hole 231 of the movable protrusion 23 is clearance-matched with the corresponding rod section 21 of the locking rod 20. The movable protrusion 23 and the inner wall of the second large diameter section 153 disposed in the second end shaft section 13 are interference-fitted with a small interference amount to radially position the right end of the locking rod 20.

[0091] like Figure 2 and Figure 3 As shown, the circumferential positioning of the movable protrusion 23 is achieved by the cooperation of the key 232 fixedly arranged on the movable protrusion 23 and the key groove 1531 on the inner wall of the second large diameter section 153.

[0092] The second large diameter section 153 and the movable protrusion 23 are in interference fit, the diameter of the second large diameter section 153 is a negative deviation, the outer diameter of the movable protrusion 23 is a positive deviation, and the total interference amount can be 0.01-0.02 mm.

[0093] During the assembly process of the motor rotor 10, the locking rod 20 and the centrifugal impeller, the movable protrusion 23 and the motor rotor 10 are assembled in a cold manner. The movable protrusion 23 is first installed to the left along the direction of the keyway 1531, and then the rod body 21 of the locking rod 20 is inserted into the axial through hole 15 of the motor rotor 10 at the left end of the motor rotor 10. Then, the first-stage centrifugal impeller 30 and the second-stage centrifugal impeller 50 are installed at the left and right ends of the rod body 21, respectively, and then the first-stage centrifugal impeller 30 and the second-stage centrifugal impeller 50 are pressed against the left and right ends of the motor rotor 10 respectively by the first locking nut 40 and the second locking nut 60 in a reverse tightening manner. After the assembly is completed, the locking rod 20, the first-stage centrifugal impeller 30, the second-stage centrifugal impeller 50, the first locking nut 40 and the second locking nut 60 form a compression structure, and the motor rotor 10 is subjected to axial inward pressure, so that the connection column between the rotor sections of the motor rotor 10 is strengthened and stabilized.

[0094] The two end shaft sections are respectively installed at the axial ends of the permanent magnet 11, and a first-stage centrifugal impeller is respectively installed on the two axial end faces of the motor rotor. It can also effectively avoid the problem of the motor rotor being too long caused by the two-stage centrifugal impellers of the two-stage centrifugal compressor being installed at the same end of the motor rotor.

[0095] like Figure 1 As shown, the two centrifugal impellers are respectively positioned at the hollow parts at the ends of the first end shaft segment 12 and the second end shaft segment 13, that is, at the axial ends of the axial through hole 15, and the radial and axial positioning of the centrifugal impeller relative to the motor rotor 10 is carried out by relying on the positioning stop on the back side of the centrifugal impeller.

[0096] The right section of the rod body of the locking rod 20 is provided with an axial shoulder, and the movable protrusion 23 is located between the axial shoulder and the end face of the axial boss of the positioning stop of the secondary centrifugal impeller 50. The axial boss of the positioning stop of the secondary centrifugal impeller 50 is clearance-matched with the movable protrusion 23, and the clearance is, for example, 0.01 to 0.02 mm. This arrangement can effectively prevent the movable protrusion 23 from moving axially inside the second large diameter section 153, and is also conducive to preventing the secondary centrifugal impeller 50 from being over-positioned in the axial direction during assembly.

[0097] When the gap distance between the axial boss of the positioning stop of the secondary centrifugal impeller 50 and the movable protrusion 23 is a small gap match, the axial positioning of the locking rod 20 can also be achieved through the shaft shoulder.

[0098] According to the above description, it can be seen that the compressor rotor of the above embodiments of the present invention can effectively improve the rotor segment connection strength of the motor rotor having multiple rotor segments, and can also increase the critical speed of the rotor by reducing the length of the cantilever end, thereby further improving the working stability and reliability of the compressor and its motor in which the compressor rotor is located, thereby achieving high-speed operation, and making the compressor structure simpler, the system more concise, and the compressor more miniaturized.

[0099] The embodiment of the present disclosure also provides a compressor, comprising the compressor rotor of the above embodiment of the present disclosure. The compressor of the embodiment of the present disclosure has the same advantages as the compressor rotor of the embodiment of the present disclosure.

[0100] In some embodiments, the compressor may include a gas bearing, and the compressor rotor is supported on the gas bearing. The gas bearing may include a radial bearing and a thrust bearing. The gas bearing may be a dynamic pressure gas bearing or a static pressure gas bearing. In the compressor of the embodiment of the present disclosure, the compressor rotor has high working stability and reliability and is suitable for being supported by gas bearings. The use of gas bearings can use the compressed working fluid as the suspended gas, thereby eliminating the lubricating oil system and oil separation system required when using rolling bearings or oil film bearings, and can reduce the complexity and space occupied by the fluid system in which the compressor is located, such as the refrigerant circulation system.

[0101] The embodiment of the present disclosure also provides a refrigerant circulation system, comprising the compressor of the aforementioned embodiment of the present disclosure. The refrigerant circulation system of the embodiment of the present disclosure has the same advantages as the aforementioned compressor rotor and compressor of the embodiment of the present disclosure.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution for protection requested by the present disclosure.

Claims

1. A compressor rotor, characterized in that: include: A motor rotor (10) comprising a plurality of rotor segments fixedly connected in an axial direction, wherein the plurality of rotor segments have axial through holes (15); A locking rod (20) passing through the axial through hole (15); A compression unit rotating part, located at the end of the motor rotor (10) and connected to the locking rod (20); and A locking component, which locks the compression unit rotating part onto the locking rod (20), wherein the locking rod (20), the compression unit rotating part and the locking component form a compression structure that applies axial pressure to the motor rotor (10) inwardly; Wherein, the axial through hole (15) comprises a small diameter section (151) and a large diameter section having a diameter greater than that of the small diameter section (151); The locking rod (20) comprises a rod body (21) and a protruding portion, wherein the rod body (21) is clearance-matched with the small-diameter section (151), the protruding portion is arranged on the rod body (21) and protrudes radially outward from the rod body (21), and the protruding portion is clearance-matched with the large-diameter section.

2. The compressor rotor according to claim 1, characterized in that: The compression unit rotating part and the locking component are respectively arranged at two ends of the locking rod (20).

3. The compressor rotor according to claim 1, characterized in that: The end of the locking rod (20) is provided with an external thread; The locking component includes a locking nut matched with the external thread.

4. The compressor rotor according to claim 1, characterized in that The protruding portion is a protruding ring.

5. The compressor rotor according to claim 1, characterized in that: The motor rotor (10) comprises a permanent magnet (11) in the axial middle portion, the small diameter section (151) is located in the axial middle portion of the axial through hole (15), and the two large diameter sections are respectively located at two ends of the axial through hole (15); The locking rod (20) comprises two protrusions, and the two protrusions are respectively matched with the two large-diameter sections.

6. The compressor rotor according to claim 5, characterized in that One of the two protrusions is a fixed protrusion (22) fixed to the rod body (21), and the other is a movable protrusion (23) movable relative to the rod body (21); or, The two protrusions are both movable protrusions that are movable relative to the rod body.

7. The compressor rotor according to claim 6, characterized in that The movable protrusion (23) and the inner wall of the axial through hole (15) are key-matched to limit the circumferential position of the movable protrusion (23).

8. The compressor rotor according to claim 6, characterized in that A shaft shoulder is provided on the rod body (21), and the movable protrusion (23) is located between an end surface of one end of the motor rotor (10) and the shaft shoulder.

9. The compressor rotor according to claim 8, characterized in that The compression unit rotating part at one end of the motor rotor (10) where the movable protrusion (23) is located includes an axial boss extending into the interior of the axial through hole (15), and the movable protrusion (23) is axially limited between the shaft shoulder and the end face of the axial boss.

10. The compressor rotor according to claim 6, characterized in that The matching clearance between the fixing protrusion (22) and the corresponding large-diameter section is smaller than the matching clearance between the rod body (21) and the small-diameter section (151).

11. The compressor rotor according to claim 6, characterized in that The movable protrusion (23) is interference-fitted with the corresponding large-diameter section; and / or, The movable protrusion (23) is clearance-matched with the rod body (21).

12. The compressor rotor according to any one of claims 1 to 11, characterized in that The plurality of rotor segments comprises: Permanent magnet(11); A first end shaft segment (12) is fixedly disposed on one end of the permanent magnet (11); and The second end shaft section (13) is fixedly arranged on the other end of the permanent magnet (11).

13. The compressor rotor according to any one of claims 1 to 11, characterized in that The compression unit rotating part includes a centrifugal impeller.

14. A compressor, characterized in that: A compressor rotor comprising the compressor rotor according to any one of claims 1 to 13.

15. The compressor according to claim 14, characterized in that The compressor includes a gas bearing on which the compressor rotor is supported.

16. A refrigerant circulation system, characterized in that: Comprising the compressor according to claim 14 or 15.

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