Rotary compressor

Abstract

The application relates to the technical field of compressors, and discloses a rotary compressor, which comprises a shell, a motor, a cylinder, a crankshaft and a rolling ring. The motor comprises a stator and a rotor rotating through electromagnetic interaction between the stator and the rotor. The stator is coaxially arranged with the shell and fixedly arranged on the inner wall of the shell. The rotor is coaxially arranged in the stator. The rotor comprises a rotor core, and an eccentric hole penetrating through the rotor core is arranged along the axial direction of the rotor. The cylinder is arranged in the eccentric hole. The crankshaft penetrates through the cylinder and is coaxially arranged in the cylinder. The crankshaft has a central hole extending along the axial direction. The crankshaft comprises a baffle groove arranged through the side wall of the crankshaft. The rolling ring has a compression space formed in the inside, is sleeved on the outside of the crankshaft, and is in gap cooperation with the cylinder. A baffle capable of sliding is arranged in the baffle groove. The first end of the baffle is in sliding connection with the rolling ring. The second end of the baffle extends into the central hole and is connected with the inner side wall of the crankshaft through an elastic piece. The application can reduce the height of the rotary compressor.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and for example to a rotary compressor. Background Technology

[0002] Combination Figure 1 , Figure 2 As shown, a compressor is disclosed in the related technology. A motor 10 is mounted on the upper part of a compressor pump body 20. The motor 10 includes a stator 11 and a rotor 12. The outer diameter of the stator 11 is interference-fitted with the inner diameter of the compressor cylinder 51. The inner diameter of the rotor 12 is interference-fitted with the outer diameter of the crankshaft 21 of the compressor pump body 20. The crankshaft 21 is inserted into a cylinder 30. A rolling ring 60 is sleeved on the outside of the crankshaft 21, forming a compression gap with the cylinder 30. The compressor pump body 20 is welded to the cylinder 51 via the cylinder 30 or an upper bearing 41. The upper cover 52 and lower cover 53 of the compressor are annularly welded to the cylinder 51 to form a closed space. The stator 11 can convert current into an alternating magnetic field, which, together with the induced magnetic field of the rotor 12 or the magnetic field of a permanent magnet, drives the crankshaft 21 to rotate.

[0003] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0004] In the existing technology, the motor is mounted on the upper part of the compressor pump body, which makes the height of the compressor affected by the stator stack height and the pump body height, resulting in a large height dimension. At the same time, the diameter of the compressor is small, resulting in a small rotor radius. This leads to a small moment of inertia when the rotor rotates, which can easily cause unbalanced load torque and large speed fluctuations in the compressor. Summary of the Invention

[0005] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0006] This disclosure provides a rotary compressor that effectively reduces the compressor's height and increases the rotor radius, thereby increasing the rotor's moment of inertia, generating stable torque to balance the compressor's load torque, and reducing speed fluctuations.

[0007] In some embodiments, the rotary compressor includes: a housing; a motor including a stator and a rotor that rotates by electromagnetic interaction with the stator, the stator being coaxially arranged with the housing and fixedly disposed on the inner wall of the housing, the rotor being coaxially disposed within the stator, wherein the rotor includes a rotor core and an eccentric hole penetrating the rotor core along the axial direction of the rotor; a cylinder disposed within the eccentric hole; a crankshaft penetrating the cylinder and coaxially disposed within the cylinder with the housing, the crankshaft having a central hole extending axially, the crankshaft including a baffle groove penetrating the side wall of the crankshaft; a rolling ring having a compression space formed inside, sleeved outside the crankshaft, and forming a clearance fit with the cylinder; wherein a slidable baffle is provided in the baffle groove, a first end of the baffle being slidably connected to the rolling ring, and a second end of the baffle extending into the central hole and connected to the inner side wall of the crankshaft by an elastic element.

[0008] In some embodiments, the elastic element includes a spring or a sheet.

[0009] In some embodiments, the crankshaft includes a first shaft segment, a second shaft segment, and a third shaft segment connected in sequence, wherein the second shaft segment is an eccentric shaft segment and is disposed within the compression space; the rotary compressor further includes: a first bearing disposed at the top end of the cylinder; and a second bearing disposed at the bottom end of the cylinder; wherein the first bearing is sleeved on the first shaft segment, and the second bearing is sleeved on the second shaft segment.

[0010] In some embodiments, the rotary compressor further includes: an intake port disposed near the baffle groove, the intake port being connected to the central hole and capable of communicating with the compression space; and an exhaust port disposed on the first bearing and / or the second bearing, the exhaust port communicating with the internal space of the housing and the compression space.

[0011] In some embodiments, the outer diameter of the first bearing is greater than the outer diameter of the cylinder, and the outer diameter of the second bearing is greater than the outer diameter of the cylinder.

[0012] In some embodiments, the rotary compressor further includes: a first spiral oil groove disposed on the inner wall surface of the first bearing capable of contacting and connecting with the crankshaft; and a second spiral oil groove disposed on the inner wall surface of the second bearing capable of contacting and connecting with the crankshaft; wherein the first spiral oil groove and the second spiral oil groove deliver lubricating oil to the cylinder.

[0013] In some embodiments, the rotary compressor further includes: an oil supply hole disposed along the axial direction of the crankshaft on the second shaft segment, for supplying lubricating oil to the side of the crankshaft in contact with the first bearing, and for supplying lubricating oil to the side of the crankshaft in contact with the second bearing.

[0014] In some embodiments, the rotary compressor further includes a balance block disposed on the first bearing and / or the second bearing, wherein at least half of the eccentric hole is located on a first side of the axis of the rotor core, and the balance block is located on a first side of the axis of the rotor core.

[0015] In some embodiments, the rotary compressor further includes one or more weight-reducing grooves disposed on the rotor core on a second side of the axis of the rotor core, wherein the first side and the second side are arranged opposite to each other.

[0016] In some embodiments, the rotary compressor further includes: an intake pipe disposed on the housing and extending through the side wall of the housing into the central hole; and an exhaust pipe disposed at the upper or lower end of the housing and communicating with the internal space of the housing.

[0017] The rotary compressor provided in this disclosure can achieve the following technical effects:

[0018] By creating an eccentric hole in the rotor and housing the cylinder within it, with the crankshaft and housing coaxially positioned within the cylinder, a combined assembly of the cylinder and rotor is achieved, significantly reducing the overall height of the rotary compressor housing. Furthermore, this allows for an adaptive increase in the compressor housing diameter, as well as the diameters of the rotor, cylinder, and rolling rings.

[0019] In this embodiment, when the stator and rotor drive the cylinder and rollers to rotate eccentrically around the crankshaft through the electromagnetic force between them, the baffle reciprocates within the baffle groove via an elastic element to separate the compression space and the central hole serving as the suction space, thereby compressing the refrigerant. During this process, the increased rotor diameter enhances the rotor's moment of inertia, generating a stable torque to balance the load torque of the rotary compressor, thus reducing speed fluctuations and improving compression efficiency.

[0020] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0022] Figure 1 This is a cross-sectional schematic diagram of a compressor in the related technology provided in the embodiments of this disclosure;

[0023] Figure 2 This is another cross-sectional schematic diagram of the compressor in the related technology provided in the embodiments of this disclosure;

[0024] Figure 3 This is a cross-sectional schematic diagram of a rotary compressor provided in an embodiment of this disclosure;

[0025] Figure 4 This is a cross-sectional schematic diagram of a rotor, cylinder, rolling ring and crankshaft assembled according to an embodiment of this disclosure;

[0026] Figure 5 This is a cross-sectional schematic diagram of a first bearing provided in an embodiment of this disclosure;

[0027] Figure 6 This is a cross-sectional schematic diagram of a second bearing provided in an embodiment of this disclosure;

[0028] Figure 7 This is a cross-sectional schematic diagram of a crankshaft provided in an embodiment of this disclosure;

[0029] Figure 8 This is a cross-sectional schematic diagram of a first bearing and a second bearing assembled with a cylinder, crankshaft, and rotor according to an embodiment of this disclosure;

[0030] Figure 9 This is a cross-sectional schematic diagram of an assembly of the top cover and the first shaft segment provided in an embodiment of this disclosure;

[0031] Figure 10 This is a cross-sectional view of the lower cover and the third shaft segment after assembly, according to an embodiment of this disclosure;

[0032] Figure 11 This is a cross-sectional schematic diagram of another rotary compressor provided in an embodiment of this disclosure.

[0033] Figure label:

[0034] 100. Outer shell; 110. Top cover; 120. Bottom cover;

[0035] 200. Motor; 210. Stator; 220. Rotor; 221. Rotor core;

[0036] 300, cylinder;

[0037] 400, Crankshaft; 410, Baffle groove; 420, Baffle; 421, Elastic element; 430, First shaft section; 440, Second shaft section; 450, Third shaft section; 460, Oil supply hole; 470, Crankshaft fixing component; 480, Shaft support;

[0038] 500, rolling ring;

[0039] 610, First bearing; 620, Second bearing; 630, First spiral oil groove; 640, Second spiral oil groove; 650, Balance block;

[0040] 710. Intake port; 720. Exhaust port;

[0041] 810. Intake pipe; 820. Exhaust pipe. Detailed Implementation

[0042] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0043] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0044] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0045] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0046] Unless otherwise stated, the term "multiple" means two or more.

[0047] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0048] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0050] Combination Figure 3 , Figure 4 As shown, where, Figure 4 This disclosure provides a rotary compressor, comprising: a housing 100, a motor 200, a cylinder 300, a crankshaft 400, and a rolling ring 500. The motor 200 includes a stator 210 and a rotor 220 that rotates via electromagnetic interaction with the stator 210. The stator 210 is coaxially arranged with the housing 100 and fixedly disposed on the inner wall of the housing 100. The rotor 220 is coaxially disposed within the stator 210. The rotor 220 includes a rotor core 221, and an eccentric hole is provided along the axial direction of the rotor 220, penetrating the rotor core 221. The cylinder 300 is disposed within the eccentric hole. The crankshaft 400 penetrates the cylinder 300 and is coaxially disposed within the cylinder 300 with the housing 100. The crankshaft 400 has a central hole extending axially. The crankshaft 400 includes a baffle groove 410, which is arranged through the side wall of the crankshaft 400. The rolling ring 500 has a compression space that communicates with the central hole. The rolling ring 500 is fitted onto the outside of the crankshaft 400 and forms a clearance fit with the cylinder 300. A sliding baffle 420 is provided within the baffle groove 410. The first end of the baffle 420 is slidably connected to the rolling ring 500, and the second end of the baffle 420 extends into the central hole and is connected to the inner wall of the crankshaft 400 via an elastic element 421.

[0051] Optionally, the interior of the housing 100 is hollow, providing installation and protection space for the motor 200, cylinder 300, and crankshaft 400. Optionally, the housing 100 includes an upper cover 110 at the upper end, a housing body, and a lower cover 120 at the lower end. The interior space of the housing 100 is enclosed by the upper cover 110, housing body, and lower cover 120 to form a sealed space, thereby providing installation space for the motor 200, cylinder 300, and crankshaft 400, and providing protection for these components. Optionally, the upper cover 110 is welded to the housing body, and the lower cover 120 is welded to the housing body.

[0052] Optionally, the stator 210 is fixedly disposed on the inner wall of the housing 100, and the rotor 220 is rotatably disposed inside the stator 210. The rotor 220 can rotate through electromagnetic interaction with the stator 210. That is, when energized, the stator 210 can generate a magnetic field, which in turn generates an electromagnetic force on the rotor 220 to drive its rotation. Optionally, the stator 210 can convert current into an alternating magnetic field, and the induced magnetic field of the rotor 220 interacts with the alternating magnetic field to generate an electromagnetic force to drive its rotation.

[0053] In this design, the stator 210 is coaxially arranged with the housing 100, and the rotor 220 is also coaxially arranged with the housing 100. That is to say, the axis of the stator 210, the axis of the rotor 220, and the axis of the housing 100 can coincide.

[0054] Optionally, the rotor 220 includes a rotor core 221, with an eccentric hole provided along the axial direction of the rotor core 221, and the eccentric hole penetrating the rotor core 221. Optionally, the cylinder 300 is disposed within the eccentric hole and forms an interference fit with the eccentric hole. That is, the cylinder 300 is eccentrically disposed relative to the axis of the housing 100, and is tightly connected to the rotor core 221 through an interference fit to ensure the stability of the cylinder 300 as it rotates with the rotor 220. In this way, by arranging the cylinder 300 in the eccentric hole provided in the rotor 220, and coaxially arranging the crankshaft 400 and the housing 100 in the cylinder 300, the combined assembly of the cylinder 300 embedded in the rotor 220 is realized. This not only greatly reduces the height of the housing 100 of the rotary compressor, but also allows the static components in existing related technologies, such as the cylinder 300 and the rolling ring 500, to be changed into moving components, thereby improving the mass of the rotating body (including rotating components such as the cylinder 300 and the rolling ring 500), and thus improving the moment of inertia and the balance during its rotation.

[0055] Optionally, the crankshaft 400 passes through the cylinder 300 and is coaxially disposed within the cylinder 300 with the housing 100. The crankshaft 400 has a central bore extending axially. The crankshaft 400 includes a baffle groove 410, which is arranged through the side wall of the crankshaft 400. A compression space communicating with the central bore is formed inside the rolling ring 500, and the rolling ring 500 is sleeved on the outside of the crankshaft 400 and forms a clearance fit with the cylinder 300. A slidable baffle 420 is provided within the baffle groove 410. The first end of the baffle 420 is slidably connected to the rolling ring 500, and the second end of the baffle 420 extends into the central bore and is connected to the inner side wall of the crankshaft 400 through an elastic element.

[0056] When energized, the rotor 220 rotates via electromagnetic interaction with the stator 210, thereby driving the cylinder 300 and the rolling ring 500 to rotate simultaneously. Since the crankshaft 400 is coaxially arranged with the housing 100, it is eccentrically positioned relative to the cylinder 300 and the rolling ring 500. When the rotor 220 drives the cylinder 300 and the rolling ring 500 to rotate simultaneously, eccentric rotation around the crankshaft 400 can be achieved.

[0057] In this way, the first end of the baffle 420 always maintains a sliding connection with the side wall of the rolling ring 500, and can move axially along the side wall of the rolling ring 500. The second end of the baffle 420, which extends into the central hole, is elastically connected to the inner side wall of the crankshaft 400 through the elastic element 421. When the rotor 220 drives the cylinder 300 and the rolling ring 500 to rotate eccentrically around the crankshaft 400, the baffle 420 can reciprocate within the baffle groove 410 under the elastic action of the elastic element 421, and separate the compression space between the crankshaft 400 and the rolling ring 500. The compression space can serve as a compression chamber, and the suction space in the central hole can serve as a suction chamber, thereby realizing the compression of the refrigerant.

[0058] In this process, the increased diameter of rotor 220 increases the moment of inertia of rotor 220, thereby generating a stable torque to balance the load torque of the rotary compressor, which in turn reduces the speed fluctuation of the rotary compressor and improves the compression efficiency of the refrigerant.

[0059] Furthermore, through the above configuration, the driving force of the motor 200 and the compression load torque of the rotary compressor are at the same level. This avoids the crankshaft 400 from deflection deformation caused by the load torque, driving torque, and centrifugal force caused by the eccentric mass of the pump body, reducing crankshaft 400 wear and thus improving crankshaft 400 lifespan as well as safety and stability during operation.

[0060] Optionally, the upper portion of the crankshaft 400 is fixedly connected to the upper cover 110 via a crankshaft retainer 470, and the lower portion of the crankshaft 400 is fixedly connected to the upper cover 110 via a crankshaft retainer 470. This improves the reliability and stability of the crankshaft 400 during assembly and operation. Optionally, the upper portion of the crankshaft 400 is interference-fitted to the upper cover 110 via the crankshaft retainer 470, and the lower portion of the crankshaft 400 is interference-fitted to the upper cover 110 via the crankshaft retainer 470.

[0061] The rotary compressor provided in this disclosure uses an eccentric hole in the rotor, within which the cylinder is housed, and the crankshaft and housing are coaxially mounted within the cylinder. This achieves a cylinder-rotor integrated assembly, significantly reducing the height of the rotary compressor housing. Furthermore, the diameter of the compressor housing can be adaptively increased, as can the diameters of the rotor, cylinder, and rolling rings. In this embodiment, when the stator and rotor drive the cylinder and rolling rings to rotate eccentrically around the crankshaft via electromagnetic force, a baffle reciprocates within a baffle groove via an elastic element to separate the compression space from the central hole serving as the suction space, thereby compressing the refrigerant. During this process, the increased rotor diameter increases the rotor's moment of inertia, generating a stable torque to balance the load torque of the rotary compressor, thus reducing speed fluctuations and improving compression efficiency.

[0062] In some embodiments, the elastic element 421 includes a spring or a sheet spring. Preferably, the elastic element 421 is a spring. Thus, when the rotor 220 drives the cylinder 300 and the rolling ring 500 to rotate eccentrically around the crankshaft 400, the baffle 420 can move towards the rolling ring 500 within the baffle groove 410 under the elastic thrust of the elastic element 421, or it can move towards the interior of the crankshaft 400 within the baffle groove 410 under the elastic contraction force of the elastic element 421. During this process, the baffle 420 can separate the compression space between the crankshaft 400 and the rolling ring 500, the compression space serving as a compression chamber, and the suction space within the central hole serving as a suction chamber, thereby achieving refrigerant compression.

[0063] Combination Figure 3 As shown, in some embodiments, the crankshaft 400 includes a first shaft segment 430, a second shaft segment 440, and a third shaft segment 450 connected in sequence. The second shaft segment 440 is an eccentric shaft segment and is disposed within a compression space.

[0064] The rotary compressor also includes a first bearing 610 and a second bearing 620. The first bearing 610 is located at the top of the cylinder 300. The second bearing 620 is located at the bottom of the cylinder 300. The first bearing 610 is sleeved on the first shaft section 430, and the second bearing 620 is sleeved on the third shaft section 450.

[0065] Thus, the first bearing 610 and the second bearing 620 are used to support and fix the crankshaft 400. In addition, the first bearing 610 can cover the top of the cylinder 300, and the second bearing 620 can cover the bottom of the cylinder 300, thereby defining the internal space of the cylinder 300 together with the cylinder 300, so that the rolling ring 500 and the second shaft segment 440 are assembled in the internal space of the cylinder 300 to form a compression space between the crankshaft 400 and the rolling ring 500.

[0066] Combination Figure 9 , Figure 10 As shown, optionally, the first shaft segment 430 is interference-fitted with the upper cover 110 through the crankshaft fixing member 470, and the third shaft segment 450 is interference-fitted with the upper cover 110 through the crankshaft fixing member 470.

[0067] Optionally, the first bearing 610 and the second bearing 620 are fixedly connected to the rotor core 221 and the cylinder 300 by screws or rivets.

[0068] In some embodiments, the rotary compressor further includes an intake port 710 and an exhaust port 720. The intake port 710 is disposed near the baffle groove 410, and the intake port 710 communicates with the central hole and can communicate with the compression space. The exhaust port 720 is disposed in the first bearing 610 and / or the second bearing 620. The exhaust port 720 communicates with the internal space of the housing 100 and the compression space.

[0069] Optionally, the intake port 710 is disposed on the side wall of the crankshaft 400 and extends through the side wall of the crankshaft 400, so that the central hole can communicate with the compression space through the intake port 710. The intake port 710 is disposed near the baffle groove 410. When the rotor 220 drives the cylinder 300 and the rolling ring 500 to rotate eccentrically around the crankshaft 400, the baffle 420 moves into the crankshaft 400 within the baffle groove 410 under the elastic contraction force of the elastic member 421, allowing refrigerant to enter the compression space through the intake port 710. Under the action of the elastic thrust of the elastic member 421, the baffle 420 moves towards the rolling ring 500 within the baffle groove 410 until the rolling ring 500 contacts the intake port 710 disposed on the crankshaft 400. At this time, the intake port 710 is closed, allowing the refrigerant in the compression space to be compressed.

[0070] Optionally, the internal space of the central hole can be regarded as an air intake 710.

[0071] Optionally, the vent 720 is provided in the first bearing 610 and / or the second bearing 620 to discharge the compressed refrigerant into the internal space of the housing 100.

[0072] In some embodiments, the outer diameter of the first bearing 610 is greater than the outer diameter of the cylinder 300, and the outer diameter of the second bearing 620 is greater than the outer diameter of the cylinder 300.

[0073] This improves the sealing of the first bearing 610 and the second bearing 620 within the internal space of the cylinder 300 and the compression space within the rolling ring 500, thereby ensuring the compression effect on the refrigerant.

[0074] Combination Figure 5 , Figure 6 As shown, in some embodiments, the rotary compressor further includes a first spiral oil groove 630 and a second spiral oil groove 640. The first spiral oil groove 630 is disposed on the inner wall surface of the first bearing 610, which can contact and connect with the crankshaft 400. The second spiral oil groove 640 is disposed on the inner wall surface of the second bearing 620, which can contact and connect with the crankshaft 400. The first spiral oil groove 630 and the second spiral oil groove 640 deliver lubricating oil into the cylinder 300.

[0075] Optionally, the rotary compressor uses oil lubrication to lubricate components such as the crankshaft 400, the first bearing 610, and the second bearing 620.

[0076] Thus, by means of the first spiral oil groove 630 provided on the inner wall surface of the first bearing 610 that can contact and connect with the crankshaft 400, lubricating oil can be forced into the cylinder by centrifugal force when the rotor 220 drives the cylinder 300 and the rolling ring 500 to rotate eccentrically around the crankshaft 400. Alternatively, by means of the second spiral oil groove 640 provided on the inner wall surface of the second bearing 620 that can contact and connect with the crankshaft 400, lubricating oil can be forced into the cylinder by centrifugal force when the rotor 220 drives the cylinder 300 and the rolling ring 500 to rotate eccentrically around the crankshaft 400.

[0077] Combination Figure 3 , Figure 7 As shown, in some embodiments, the rotary compressor further includes an oil supply port 460. The oil supply port 460 is disposed along the axial direction of the crankshaft 400 in the second shaft section 440. The oil supply port 460 is used to supply lubricating oil to the side of the crankshaft 400 that contacts the first bearing 610, and to supply lubricating oil to the side of the crankshaft 400 that contacts the second bearing 620.

[0078] In this way, on the one hand, the friction between the first bearing 610 and the second bearing 620 and the crankshaft 400 can be reduced. On the other hand, the lubricating oil can reduce refrigerant leakage in the tiny gaps between the first bearing 610, the second bearing 620 and the crankshaft 400. Furthermore, it can prevent corrosion when the rotary compressor stops running.

[0079] Combination Figure 8 As shown, in some embodiments, the rotary compressor further includes a balance block 650. The balance block 650 is disposed on the first bearing 610 and / or the second bearing 620. At least half of the eccentric bore is located on the first side of the axis of the rotor core 221, and the balance block 650 is located on the first side of the axis of the rotor core 221.

[0080] In this way, by setting the balance block 650, it helps to reduce the influence of the eccentric weight of the rotor core 221 on the centrifugal force generated by the rotor 220 when it rotates, and at the same time, it can reduce the vibration of the rotary compressor caused by the centrifugal force generated by the eccentric weight, thereby improving the performance of the compressor.

[0081] In some embodiments, the rotary compressor further includes one or more weight-reduction slots. One or more weight-reduction slots are disposed on the rotor core 221 on the second side of the axis of the rotor core 221. The first side and the second side are arranged opposite to each other.

[0082] In this way, on the one hand, it helps to reduce the influence of the eccentric weight of the rotor core 221 on the centrifugal force generated by the rotor 220 when it rotates, and at the same time, it can reduce the vibration of the rotary compressor caused by the centrifugal force generated by the eccentric weight, thereby improving the performance of the compressor; on the other hand, it can reduce costs.

[0083] Optionally, the weight-reducing groove is configured as a through hole or a blind hole. It is understood that the shape of the weight-reducing groove can be circular or fan-shaped.

[0084] In some embodiments, the rotary compressor further includes an inlet pipe 810 and an outlet pipe 820. The inlet pipe 810 is disposed in the housing 100 and extends through the side wall of the housing into the central hole. The outlet pipe 820 is disposed at the upper end of the housing 100 and communicates with the internal space of the housing. In this way, gaseous refrigerant can enter the internal space of the central hole through the inlet pipe 810. After being compressed by entering the compression space through the suction port 710, it is discharged from the housing 100 through the exhaust port 720 and the outlet pipe 820.

[0085] Optionally, the exhaust pipe 820 is disposed on the upper cover 110 and fixedly connected to the upper cover 110. For example, a threaded connection or a flange connection.

[0086] Combination Figure 11As shown, optionally, the rotary compressor also includes a shaft support 480. The first shaft section 430 of the crankshaft 400 is connected to the shaft support 480 by an interference fit and then fixedly connected to the housing 100. The third shaft section 450 of the crankshaft 400 is connected to the shaft support 480 by an interference fit and then fixedly connected to the housing 100. This improves the assembly stability of the crankshaft 400 and its stability during operation. Optionally, the fixed connection can be welded.

[0087] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A rotary compressor, characterized in that, include: The outer casing (100) includes an upper cover (110) disposed at the upper end, an outer casing body, and a lower cover (120) disposed at the lower end. The internal space of the outer casing is enclosed by the upper cover (110), the outer casing body, and the lower cover (120) to form a sealed space. The motor (200) includes a stator (210) and a rotor (220) that rotates by electromagnetic interaction with the stator (210). The stator (210) is coaxially arranged with the housing (100) and fixedly disposed on the inner wall of the housing (100). The rotor (220) is coaxially disposed inside the stator (210). The rotor (220) includes a rotor core (221) and an eccentric hole is provided along the axial direction of the rotor (220) through the rotor core (221). A cylinder (300) is disposed within the eccentric hole; A crankshaft (400) passes through the cylinder (300) and is coaxially disposed within the cylinder (300) with the housing (100). The crankshaft (400) has a central hole extending axially. The crankshaft (400) includes a baffle groove (410) that is arranged through the side wall of the crankshaft (400). A rolling ring (500) has a compression space inside. The rolling ring is sleeved on the outside of the crankshaft (400) and forms a clearance fit with the cylinder (300). The baffle groove (410) is provided with a sliding baffle (420). The first end of the baffle (420) is slidably connected to the rolling ring (500), and the second end of the baffle (420) extends into the central hole and is connected to the inner wall of the crankshaft (400) through an elastic element (421).

2. The rotary compressor according to claim 1, characterized in that, The elastic element (421) includes a spring or a sheet.

3. The rotary compressor according to claim 1, characterized in that, The crankshaft (400) includes a first shaft segment (430), a second shaft segment (440) and a third shaft segment (450) connected in sequence, wherein the second shaft segment (440) is an eccentric shaft segment and is disposed within the compression space; The rotary compressor also includes: A first bearing (610) is disposed at the top of the cylinder (300); The second bearing (620) is disposed at the bottom end of the cylinder (300); The first bearing (610) is sleeved on the first shaft segment (430), and the second bearing (620) is sleeved on the third shaft segment (450).

4. The rotary compressor according to claim 3, characterized in that, Also includes: An air intake hole (710) is provided near the baffle groove (410), and the air intake hole (710) is connected to the central hole and can be connected to the compression space; An exhaust port (720) is provided in the first bearing (610) and / or the second bearing (620), the exhaust port (720) communicating with the internal space of the housing (100) and the compression space.

5. The rotary compressor according to claim 3, characterized in that, The outer diameter of the first bearing (610) is larger than the outer diameter of the cylinder (300), and the outer diameter of the second bearing (620) is larger than the outer diameter of the cylinder (300).

6. The rotary compressor according to claim 3, characterized in that, Also includes: The first spiral oil groove (630) is provided on the inner wall surface of the first bearing (610) that can contact and connect with the crankshaft (400); The second spiral oil groove (640) is provided on the inner wall surface of the second bearing (620) that can contact and connect with the crankshaft (400); The first spiral oil groove (630) and the second spiral oil groove (640) deliver lubricating oil into the cylinder (300).

7. The rotary compressor according to claim 3, characterized in that, Also includes: An oil supply hole (460) is provided on the second shaft section (440) along the axial direction of the crankshaft (400) for supplying lubricating oil to the side of the crankshaft (400) that contacts the first bearing (610) and for supplying lubricating oil to the side of the crankshaft (400) that contacts the second bearing (620).

8. The rotary compressor according to claim 3, characterized in that, Also includes: A balance block (650) is disposed on the first bearing (610) and / or the second bearing (620), wherein at least half of the eccentric hole is located on the first side of the axis of the rotor core (221), and the balance block (650) is located on the first side of the axis of the rotor core.

9. The rotary compressor according to claim 8, characterized in that, Also includes: One or more weight-reducing grooves are disposed on the rotor core (221) on the second side of the axis of the rotor core (221), with the first side and the second side arranged opposite to each other.

10. The rotary compressor according to any one of claims 1 to 9, characterized in that, Also includes: An air intake pipe (810) is disposed on the housing (100) and extends through the side wall of the housing (100) into the central hole; An exhaust pipe (820) is disposed at the upper or lower end of the housing (100) and communicates with the internal space of the housing (100).

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