Rotary compressor

Abstract

The utility model relates to the technical field of compressors, and discloses a rotary compressor which comprises a shell, a driving mechanism, a compressing mechanism and a supporting assembly, the shell is provided with an inner cavity, the driving mechanism is arranged in the inner cavity, and the driving mechanism comprises a rotor and a stator; the compression mechanism is arranged in the inner cavity and comprises a crankshaft, and the rotor is arranged on the crankshaft in a sleeving mode; the supporting assembly is arranged in the inner cavity and provided with an auxiliary bearing, and the auxiliary bearing is located on the side, away from the compression mechanism, of the driving mechanism; wherein the auxiliary bearing supports the crankshaft, the crankshaft is provided with a first shaft section connected with the supporting assembly, the first shaft section is provided with a high-frequency quenching shaft section, the high-frequency quenching shaft section is sleeved with the auxiliary bearing, the length of the high-frequency quenching shaft section is L1 in the axial direction of the crankshaft, the matching length of the high-frequency quenching shaft section and the auxiliary bearing is L, and L1 is larger than or equal to L. The hardness and the abrasion resistance of the surface of the first shaft section can be greatly improved through high-frequency quenching treatment, abrasion of the crankshaft can be reduced, and the use reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a rotary compressor. Background Art

[0002] Rotary compressors are power components widely used in refrigeration equipment. Rotary compressors usually consist of a housing, a driving mechanism and a compression mechanism. The driving mechanism and the compression mechanism are connected by a crankshaft. Main bearings and auxiliary bearings are usually arranged on both sides of the compression mechanism to support the crankshaft, and a support assembly is arranged on one side of the driving mechanism. The first shaft section of the crankshaft that cooperates with the support assembly is prone to wear and has poor reliability. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a rotary compressor, which reduces the wear of the crankshaft by performing high-frequency quenching treatment on the first shaft section of the crankshaft.

[0004] According to the rotary compressor of the embodiment of the utility model, it includes a shell, a driving mechanism, a compression mechanism and a supporting assembly, the shell has an inner cavity, the driving mechanism is arranged in the inner cavity, the driving mechanism includes a rotor and a stator; the compression mechanism is arranged in the inner cavity, the compression mechanism includes a crankshaft, and the rotor is sleeved on the crankshaft; the supporting assembly is arranged in the inner cavity, the supporting assembly is provided with an auxiliary bearing, and the auxiliary bearing is located on the side of the driving mechanism away from the compression mechanism; wherein the auxiliary bearing supports the crankshaft, the crankshaft is provided with a first shaft section connected to the supporting assembly, the first shaft section is provided with a high-frequency quenching shaft section, the auxiliary bearing is sleeved on the high-frequency quenching shaft section, along the axial direction of the crankshaft, the length of the high-frequency quenching shaft section is L1, and the length of the high-frequency quenching shaft section and the auxiliary bearing is L, which satisfies: L1≥L.

[0005] The rotary compressor according to the first embodiment of the utility model has at least the following beneficial effects:

[0006] A support assembly is added to the inner cavity of the housing to provide a third support point for the crankshaft, so that the force on the crankshaft is balanced. In addition, the first shaft section is provided with a high-frequency quenched shaft section, which can greatly improve the hardness and wear resistance of the surface of the first shaft section through high-frequency quenching treatment. The design meets: L1≥L, so that the parts that contact the auxiliary bearing are all high-frequency quenched shaft sections, which is beneficial to reduce the wear of the crankshaft and improve the reliability of use.

[0007] According to some embodiments of the utility model, the crankshaft is provided with a tool retreat groove, which is located at the end of the first shaft segment. The diameter of the first shaft segment is D. Along the axial direction of the crankshaft, the distance between the auxiliary bearing and the tool retreat groove is L0, satisfying: 0≤L0≤D.

[0008] According to some embodiments of the present invention, the L, the L0 and the L1 satisfy: 0≤L1-L0-L≤D.

[0009] According to some embodiments of the present invention, a centering shaft segment is provided at one end of the first shaft segment away from the tool retreat groove, and a minimum distance between the centering shaft segment and the tool retreat groove is L3, satisfying: L1≤L3.

[0010] According to some embodiments of the present invention, the total length of the first shaft segment is L2, satisfying: L1≤L2.

[0011] According to some embodiments of the utility model, the support assembly includes a support frame and a bearing seat of an integrated structure, the support frame is fixedly connected to the shell, the bearing seat is arranged at the center of the support frame, and the auxiliary bearing is connected to the bearing seat.

[0012] According to some embodiments of the utility model, the support assembly includes a support frame and a bearing seat, the support frame is provided with an outer ring portion, the outer ring portion is fixed to the inner wall of the shell, the inner wall of the outer ring portion is provided with three support plates, the three support plates are distributed at intervals along the circumference of the outer ring portion, the bearing seat is connected to the three support plates, and the auxiliary bearing is connected to the bearing seat.

[0013] According to some embodiments of the utility model, a mounting groove is provided at one end of the bearing seat facing the driving mechanism, the auxiliary bearing is installed in the mounting groove, a through hole is provided on the bottom wall of the mounting groove, and the crankshaft passes through the through hole.

[0014] According to some embodiments of the utility model, the compression mechanism includes a cylinder, which is fixed to the inner wall of the shell; or, the compression mechanism is respectively connected to a main bearing and a secondary bearing at both axial ends, the cylinder is fixedly connected to the main bearing, and the main bearing is fixed to the inner wall of the shell.

[0015] According to some embodiments of the present utility model, the compression mechanism includes a cylinder and a frame, the frame is fixed to the inner wall of the shell, and the cylinder and the frame are connected and fixed by fasteners.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 A cross-sectional view of a rotary compressor according to an embodiment of the present utility model;

[0019] Figure 2 It is a cross-sectional view of the main bearing, the secondary bearing, the auxiliary bearing and the crankshaft in the embodiment of the utility model;

[0020] Figure 3 It is a cross-sectional view of a crankshaft in an embodiment of the utility model;

[0021] Figure 4 It is a structural schematic diagram of the support assembly in some embodiments of the utility model;

[0022] Figure 5 for Figure 4 A partial cross-sectional view of the cooperation between the middle support assembly and the crankshaft;

[0023] Figure 6 It is a partial cross-sectional view of the cooperation between the support assembly and the crankshaft in other embodiments of the utility model;

[0024] Figure 7 It is a schematic diagram of the structure of the connection between the compression mechanism and the housing in some embodiments of the utility model;

[0025] Figure 8 It is a schematic diagram of the structure of the connection between the compression mechanism and the housing in other embodiments of the utility model;

[0026] Fig. 9 It is a structural schematic diagram of the connection between the compression mechanism and the shell in some other embodiments of the utility model.

[0027] The figures are as follows:

[0028] Shell 100, inner cavity 101, upper shell 110, main shell 120, lower shell 130, exhaust pipe 140, intake pipe 150;

[0029] Driving mechanism 200, rotor 210, stator 220;

[0030] Compression mechanism 300, crankshaft 310, first shaft section 311, high-frequency quenched shaft section 3111, centering shaft section 3112, second shaft section 312, third shaft section 313, undercut groove 314, first cylinder 320, second cylinder 330, first piston 340, second piston 350, partition plate 360, frame 370;

[0031] Support assembly 400, auxiliary bearing 410, support frame 420, outer ring portion 421, support plate 422, bearing seat 430, mounting hole 431, enclosure plate 432, mounting groove 433;

[0032] Main bearing 510, auxiliary bearing 520;

[0033] Liquid reservoir 600. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] Refrigeration equipment relies on the refrigeration system to produce cold air to achieve the purpose of regulating temperature. The compressor is the power component of the refrigeration system. The compressor drives the refrigerant to circulate and realize continuous cycle refrigeration. Among them, the rotary compressor is a commonly used type of compressor. The rotary compressor usually includes a shell, a driving mechanism and a compression mechanism. The driving mechanism and the compression mechanism are connected by a crankshaft. The driving mechanism drives the compression mechanism through the crankshaft. The eccentrically rotating piston and cylinder in the compression mechanism cooperate to compress the refrigerant. Main bearings and auxiliary bearings are usually set on both sides of the compression mechanism to support the crankshaft. In order to balance the force on the crankshaft, a support assembly can be set on the side of the driving mechanism away from the compression mechanism to improve the force balance of the crankshaft. However, the first shaft section of the crankshaft that cooperates with the support assembly is prone to wear and has poor reliability, which reduces the service life of the crankshaft and affects the operating stability of the rotary compressor.

[0039] To this end, an embodiment of the utility model proposes a rotary compressor, which optimizes the design of the crankshaft and sets a high-frequency quenching shaft section in the first shaft section. The high hardness and high wear resistance brought by high-frequency quenching are utilized to reduce the wear of the first shaft section, improve the reliability and service life of the crankshaft, and thus improve the operating stability of the rotary compressor.

[0040] Reference Figure 1 The rotary compressor proposed in the embodiment of the utility model includes a housing 100, a driving mechanism 200, a compression mechanism 300, a support assembly 400 and a liquid storage device 600. The housing 100 includes an upper housing 110, a main housing 120 and a lower housing 130. The upper housing 110 and the lower housing 130 are fixed at both ends of the main housing 120. Usually, the upper housing 110 and the lower housing 130 are inserted at both ends of the main housing 120, and then fixed and sealed by welding, so that a closed inner cavity 101 is formed inside the housing 100, and the inner cavity 101 is used to accommodate the driving mechanism 20. 0, the compression mechanism 300 and the support assembly 400 and other components, the accumulator 600 is connected to the outer wall of the shell 100, the exhaust pipe 140 of the rotary compressor is arranged on the upper shell 110, and the suction pipe 150 of the rotary compressor is arranged at the lower end of the main shell 120, the suction pipe 150 is connected to the accumulator 600, the return air of the refrigeration system first enters the accumulator 600, and the separation function of the accumulator 600 is used to separate the liquid refrigerant and the gaseous refrigerant, so that most of the refrigerant sucked by the compression mechanism 300 from the suction pipe 150 is gaseous, which helps the stable operation of the compression mechanism 300.

[0041] Among them, the driving mechanism 200 includes a rotor 210 and a stator 220, the stator 220 is fixed to the inner wall of the shell 100, and the rotor 210 is rotatably arranged inside the stator 220. The compression mechanism 300 includes a crankshaft 310. The rotor 210 of the driving mechanism 200 is installed on the crankshaft 310. The rotor 210 and the stator 220 form a motor. When the stator 220 is energized, the crankshaft 310 is driven by the rotor 210 to rotate, thereby driving the compression mechanism 300 to operate.

[0042] The compression mechanism 300 includes a first cylinder 320 and a second cylinder 330. A first piston 340 is disposed in the compression chamber of the first cylinder 320, and a second piston 350 is disposed in the compression chamber of the second cylinder 330. The first piston 340 and the second piston 350 are both mounted on the crankshaft 310. A partition plate 360 ​​is disposed between the first cylinder 320 and the second cylinder 330 to separate the first cylinder 320 and the second cylinder 330. A main bearing 510 is disposed on the side of the first cylinder 320 close to the driving mechanism 200, and a secondary bearing 520 is disposed on the side of the second cylinder 330 away from the driving mechanism 200. The main bearing 510, the first cylinder 320, the partition plate 360, the second cylinder 330 and the secondary bearing 520 are connected in sequence, and the compression chambers of the first cylinder 320 and the second cylinder 330 are sealed at the same time.

[0043] When the rotary compressor is in operation, the crankshaft 310 drives the first piston 340 and the second piston 350 to rotate eccentrically, and cooperates with the first cylinder 320 and the second cylinder 330 to achieve compression of the refrigerant. The rotation angles of the first piston 340 and the second piston 350 are staggered, and the gaseous refrigerant is alternately sucked in from the liquid storage tank 600, and is discharged into the inner cavity 101 after compression, and finally output from the exhaust pipe 140.

[0044] Reference Figure 1 The support assembly 400 is disposed in the inner cavity 101 of the housing 100 and is located on a side of the drive mechanism 200 away from the compression mechanism 300 (eg Figure 1 As shown, the support assembly 400 is located on the upper side of the driving mechanism 200, the support assembly 400 is fixed to the inner wall of the housing 100, and can be fixed to the upper end of the main housing 120 or the upper housing 110, and the support assembly 400 is connected to the end of the crankshaft 310 that passes through the rotor 210 (such as Figure 1 The upper end of the crankshaft 310 is shown as a support assembly. Thus, the support assembly 400 forms an upper support structure for the crankshaft 310 and the rotor 210, further supports and limits the compression mechanism 300, the crankshaft 310 and the rotor 210, improves the position accuracy of the crankshaft 310, prevents the crankshaft 310 from excessive elastic deformation during the startup of the rotary compressor, or deflects during the operation of the rotary compressor, thereby avoiding the collision between the rotor 210 and the stator 220, and improving the wear of the crankshaft 310 and the first piston 340 and the second piston 350, thereby improving the performance and reliability of the rotary compressor.

[0045] It is understandable that the drive mechanism 200 used in some rotary compressors is larger in size and has greater power, such as Figure 1 and Figure 2As shown, the ratio of the outer diameter of the stator 220 to the length of the core axis of the stator 220 is greater than 0.58, indicating that the aspect ratio of the driving mechanism 200 is relatively large, and the driving force applied by the driving mechanism 200 to the crankshaft 310 is relatively large. During the operation of the rotary compressor, the stress deformation of the crankshaft 310 is relatively large. Adding the support assembly 400 is beneficial to balancing the stress on the crankshaft 310, especially on both sides of the driving mechanism 200, the crankshaft 310 is supported to prevent the rotor 210 and the stator 220 from colliding and rubbing.

[0046] Reference Figures 1 to 3 , wherein the main bearing 510, the secondary bearing 520 and the auxiliary bearing 410 jointly support the crankshaft 310, the crankshaft 310 is provided with a first shaft section 311 connected to the support assembly 400, a second shaft section 312 matched with the main bearing 510 and a third shaft section 313 matched with the secondary bearing 520, at least a portion of the first shaft section 311 is subjected to high frequency quenching treatment to obtain a high frequency quenched shaft section 3111, and the auxiliary bearing 410 is sleeved on the outer side of the high frequency quenched shaft section 3111. It can be understood that high frequency quenching is a process for surface quenching of industrial metal parts, which generates a certain induction current on the surface of the workpiece, quickly heats the surface of the part, and then quickly quenches the metal. The principle of induction heating: the workpiece is placed in the inductor, which is generally a hollow copper tube that inputs medium frequency or high frequency alternating current (1000Hz-300000Hz or higher). The alternating magnetic field generates an induced current of the same frequency in the workpiece. The distribution of this induced current in the workpiece is uneven. It is strong on the surface and very weak inside. It is close to 0 in the core. By utilizing this skin effect, the surface of the workpiece can be heated rapidly. The surface temperature rises to 800-1000℃ within a few seconds, while the temperature rise in the core of the workpiece is very small. Through high-frequency quenching treatment, the hardness and wear resistance can be significantly improved, thereby reducing the wear of the first shaft segment 311 and improving the reliability and service life.

[0047] In addition, it is understandable that, corresponding to the stress state of the crankshaft 310, the stress of the first shaft section 311 is smaller than that of the second shaft section 312 and the third shaft section 313, and in design, the diameter of the first shaft section 311 is the smallest. Considering that the rotor 210 is usually assembled to the crankshaft 310 by cold pressing or shrink sleeve, the rotor 210 needs to pass through the first shaft section 311 first, and then be installed on the crankshaft 310 between the second shaft section 312 and the first shaft section 311. When assembling the rotor 210, the first shaft section 311 with a smaller diameter will not be scratched by the rotor 210, eliminating the problem of abnormal wear of the first shaft section 311 during the operation of the rotary compressor, improving the service life of the crankshaft 310, and thus improving the stability of the rotary compressor.

[0048] It is understandable that the rotary compressor proposed in the embodiment of the utility model provides a third support point for the crankshaft 310 by adding a support assembly 400 in the inner cavity 101 of the housing 100, so that the force of the crankshaft 310 is balanced. In addition, the first shaft section 311 is provided with a high-frequency quenching shaft section 3111, and the hardness and wear resistance of the surface of the crankshaft 310 can be greatly improved through high-frequency quenching treatment. The design satisfies: L1≥L, so that the part of the shaft section contacting the auxiliary bearing 410 is the high-frequency quenching shaft section 3111, which is conducive to reducing the wear of the crankshaft 310, improving the reliability and service life, and thus improving the performance and reliability of the rotary compressor.

[0049] It should be understood that after the first shaft segment 311 is subjected to high-frequency quenching treatment, the surface will turn black and the hardness will be greater than that of ordinary quenching, and it has higher hardness and wear resistance. The first shaft segment 311 and the high-frequency quenched shaft segment 3111 can be distinguished by color and hardness testing.

[0050] Reference Figure 2 and Figure 3 In some embodiments of the utility model, a tool-retracting groove 314 is provided at one end of the first shaft segment 311 close to the driving mechanism 200. In the axial direction of the first shaft segment 311, the shaft segment length between the tool-retracting groove 314 and the auxiliary bearing 410 is set to L0, that is, the distance between the tool-retracting groove 314 and the auxiliary bearing 410 is L0. The outer diameter of the first shaft segment 311 is defined as D, and the design satisfies: 0≤L0≤D. In lathe processing, such as turning the outer diameter and turning the thread, in order to facilitate the withdrawal of the tool and the processing of the process to the bottom of the blank, an empty groove for tool withdrawal is often pre-made at the end of the surface to be processed, which is called a tool-retracting groove. The provision of the tool-retracting groove 314 is conducive to accurate processing of the first shaft segment 311, so as to improve the dimensional accuracy and surface quality of the first shaft segment 311.

[0051] The design of the crankshaft 310 adopts 0≤L0≤D, so that part of the outer wall of the high-frequency quenched shaft section 3111 is located outside the auxiliary bearing 410, so that the outer wall contacted by the auxiliary bearing 410 is all high-frequency quenched, has high wear resistance, and reduces wear. It should be understood that L0 can be designed to be 0, that is, the auxiliary bearing 410 is flush with the side wall of the backing groove 314, and the structure of the crankshaft 310 is more compact; L0 can also be increased, and the maximum does not exceed D. On the basis of meeting the requirement of improving wear resistance, the total length of the crankshaft 310 is not too large and is within a suitable range.

[0052] Reference Figure 2 and Figure 3The crankshaft 310 can also be designed to meet the following conditions: 0≤L1-L0-L≤D. In the axial direction of the crankshaft 310, the high-frequency quenched shaft section 3111 can exceed both ends of the auxiliary bearing 410, further limiting the auxiliary bearing 410 to contact the high-frequency quenched shaft section 3111. The high wear resistance of the outer wall of the high-frequency quenched shaft section 3111 can be used to reduce the wear of the crankshaft 310, which is beneficial to improving the operating stability of the crankshaft 310. Among them, the range of the high-frequency quenched shaft section 3111 exceeding the upper end of the auxiliary bearing 410 is limited to within the value of D; of course, the high-frequency quenched shaft section 3111 can also be flush with the upper end of the auxiliary bearing 410 to meet the use requirements.

[0053] It is understandable that if Figure 3 As shown, a centering shaft section 3112 is provided at one end of the first shaft section 311 away from the undercut groove 314, and the outer wall of the centering shaft section 3112 is tapered, and the centering shaft section 3112 can help adjust the crankshaft 310. The shaft section length between the undercut groove 314 and the centering shaft section 3112 is defined as L3, that is, the minimum distance between the undercut groove 314 and the centering shaft section 3112 is L3. Considering that the centering shaft section 3112 will produce a melting effect during high-frequency quenching, the crankshaft 310 is designed to meet the following conditions: L1≤L3, so that the high-frequency quenching shaft section 3111 and the centering shaft section 3112 are adjacent or have a gap, so as to prevent the shape accuracy of the centering shaft section 3112 from being affected.

[0054] It can be understood that, in another embodiment, in the axial direction of the crankshaft 310, the total length of the first shaft section 311 is defined as L2, and the crankshaft 310 is designed to satisfy: L1≤L2, that is, the high-frequency quenched shaft section 3111 can be a part of the first shaft section 311, or the entire first shaft section 311 can be subjected to high-frequency quenching treatment, so that the entire outer wall of the first shaft section 311 has improved hardness and wear resistance, and the outer wall in contact with the auxiliary bearing 410 has high wear resistance, thereby reducing the installation position accuracy requirements of the auxiliary bearing 410, which is conducive to improving assembly efficiency.

[0055] It is understandable that the support assembly 400 can be fixed to the inner wall of the housing 100 or to the upper end of the stator 200, both of which can meet the use requirements.

[0056] Reference Figure 4 and Figure 5In some embodiments of the utility model, the support assembly 400 includes a support frame 420 and a bearing seat 430 of an integral structure. The support frame 420 and the bearing seat 430 can be integrally cast or fixed as a whole by welding, and have the advantages of stable structure and good consistency. The support frame 420 is fixedly connected to the inner wall of the housing 100, and the bearing seat 430 is arranged at the center of the support frame 420. A mounting hole 431 is arranged at the center of the bearing seat 430. The auxiliary bearing 410 is installed in the mounting hole 431. The first shaft section 311 of the crankshaft 310 is passed through the mounting hole 431. The high-frequency quenched shaft section 3111 of the first shaft section 311 is supported and matched with the auxiliary bearing 410, and the end of the first shaft section 311 passes through the mounting hole 431. Lubricating oil or grease can be conveniently added through the mounting hole 431.

[0057] Reference Figure 6 In some other embodiments of the present invention, the support assembly 400 includes a split-structure support frame 420 and a bearing seat 430, the support frame 420 is fixedly connected to the housing 100, the bearing seat 430 is installed on the support frame 420, and the auxiliary bearing 410 is installed on the bearing seat 430. Figure 6 As shown, the support frame 420 includes an outer ring portion 421, and the outer ring portion 421 is arranged along the axial direction of the first shaft segment 311, so that the outer ring portion 421 and the housing 100 have a larger contact area, thereby improving the connection stability. The outer ring portion 421 and the housing 100 can be welded and fixed, or can be fixed by fasteners such as bolts. Three support plates 422 are arranged on the inner wall of the outer ring portion 421, and the three support plates 422 are distributed at intervals along the circumference of the outer ring portion 421 to connect the bearing seat 430, wherein the outer wall of the bearing seat 430 is provided with a surrounding plate 432, and the surrounding plate 432 abuts against the three The upper end surface of the support plate 422 is fixed to the enclosure 432 and the support plate 422 by fasteners, such as bolts, through holes are provided in the enclosure 432 and the support plate 422, and the bolts pass through the through holes to connect and fix the bearing seat 430 and the support frame 420; or, rivets are used as fasteners, through holes are provided in the enclosure 432 and the support plate 422, and the rivets pass through the through holes to connect and fix the bearing seat 430 and the support frame 420; of course, other structures can be used to replace the fasteners, as long as they can meet the purpose of connecting and fixing the bearing seat 430 and the support frame 420. The bearing seat 430 and the support frame 420 are connected by fasteners. During installation, the bearing seat 430 can be fine-tuned so that the auxiliary bearing 410 is accurately aligned with the first shaft section 311, thereby improving the accuracy of assembly.

[0058] like Figure 6As shown, a mounting groove 433 is provided at one end of the bearing seat 430 facing the driving mechanism 200, and the auxiliary bearing 410 is installed in the mounting groove 433. A through hole is provided on the bottom wall of the mounting groove 433, and the first shaft section 311 passes through the through hole. The opening of the mounting groove 433 faces the driving mechanism 200, and the bottom wall of the mounting groove 433 is located on the side away from the driving mechanism 200, that is, the upper side of the mounting groove 433. The through hole provided on the bottom wall of the mounting groove 433 facilitates the addition of lubricating oil or grease to provide sufficient lubrication and improve the operating stability of the rotary compressor.

[0059] Reference Figure 7 In some embodiments of the present invention, the compression mechanism 300 has two cylinders, including a first cylinder 320 and a second cylinder 330, and the compression mechanism 300 is fixed to the inner wall of the housing 100 through at least one of the two cylinders. The first cylinder 320 may be fixed to the inner wall of the housing 100, the second cylinder 330 may be fixed to the inner wall of the housing 100, or the first cylinder 320 and the second cylinder 330 may be fixed to the inner wall of the housing 100 at the same time. Among them, the first cylinder 320 and / or the second cylinder 330 may be interference fit with the housing 100, fixed by positioning blocks, fixed by pins, etc.

[0060] Reference Figure 8 In other embodiments of the present invention, the first cylinder 320 of the compression mechanism 300 is fixedly connected to the main bearing 510, and the main bearing 510 is fixed to the inner wall of the shell 100, wherein the main bearing 510 and the shell 100 can be interference fit, fixed with positioning blocks, fixed with pins, etc.

[0061] Reference Fig. 9 In some other embodiments of the present invention, the compression mechanism 300 includes a frame 370, the frame 370 is fixed to the inner wall of the housing 100, the first cylinder 320 and the frame 370 are connected and fixed by fasteners, and the compression mechanism 300 is fixed to the housing 100 by the frame 370. For example, the fasteners are bolts, the first cylinder 320 and the frame 370 are both provided with through holes, the bolts are passed through the two through holes, and the first cylinder 320 is connected and fixed to the frame 370. The frame 370 can be welded and fixed to the inner wall of the housing 100, or it can be fixed to the housing 100 by fasteners such as bolts.

[0062] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A rotary compressor, characterized in that: include: a housing having an inner cavity; A driving mechanism is disposed in the inner cavity, wherein the driving mechanism comprises a rotor and a stator; A compression mechanism is arranged in the inner cavity, wherein the compression mechanism comprises a crankshaft, and the rotor is sleeved on the crankshaft; A support assembly is arranged in the inner cavity, wherein the support assembly is provided with an auxiliary bearing, and the auxiliary bearing is located on a side of the driving mechanism away from the compression mechanism; Among them, the auxiliary bearing supports the crankshaft, the crankshaft is provided with a first shaft section connected to the supporting assembly, the first shaft section is provided with a high-frequency quenched shaft section, the auxiliary bearing is sleeved on the high-frequency quenched shaft section, along the axial direction of the crankshaft, the length of the high-frequency quenched shaft section is L1, and the length of the high-frequency quenched shaft section and the auxiliary bearing is L, satisfying: L1≥L.

2. The rotary compressor according to claim 1, characterized in that: The crankshaft is provided with a tool retreat groove, which is located at the end of the first shaft segment. The diameter of the first shaft segment is D. Along the axial direction of the crankshaft, the distance between the auxiliary bearing and the tool retreat groove is L0, satisfying: 0≤L0≤D.

3. The rotary compressor according to claim 2, characterized in that: The L, L0 and L1 satisfy: 0≤L1-L0-L≤D.

4. The rotary compressor according to claim 2, characterized in that: A centering shaft section is disposed at one end of the first shaft section away from the tool retreat groove, and a minimum distance between the centering shaft section and the tool retreat groove is L3, satisfying: L1≤L3.

5. The rotary compressor according to claim 1, characterized in that: The total length of the first shaft segment is L2, satisfying: L1≤L2.

6. The rotary compressor according to claim 1, characterized in that: The support assembly includes a support frame and a bearing seat of an integrated structure. The support frame is fixedly connected to the shell, the bearing seat is arranged at the center of the support frame, and the auxiliary bearing is connected to the bearing seat.

7. The rotary compressor according to claim 1, characterized in that: The support assembly includes a support frame and a bearing seat, the support frame is provided with an outer ring portion, the outer ring portion is fixed to the inner wall of the shell, the inner wall of the outer ring portion is provided with three support plates, the three support plates are distributed at intervals along the circumference of the outer ring portion, the bearing seat is connected to the three support plates, and the auxiliary bearing is connected to the bearing seat.

8. The rotary compressor according to claim 7, characterized in that: The bearing seat is provided with a mounting groove at one end facing the driving mechanism, the auxiliary bearing is installed in the mounting groove, the bottom wall of the mounting groove is provided with a through hole, and the crankshaft passes through the through hole.

9. The rotary compressor according to claim 1, characterized in that: The compression mechanism comprises a cylinder, which is fixed to the inner wall of the shell; or, the compression mechanism is respectively connected to a main bearing and a secondary bearing at two axial ends, the cylinder is fixedly connected to the main bearing, and the main bearing is fixed to the inner wall of the shell.

10. The rotary compressor according to claim 1, characterized in that The compression mechanism comprises a cylinder and a frame, the frame is fixed to the inner wall of the shell, and the cylinder and the frame are connected and fixed by fasteners.

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