Oil return channel arranged by utilizing crankshaft rotor assembly and oil return method
By designing a multi-stage oil return channel system for the crankshaft rotor assembly in a scroll compressor, the problem of lubricating oil being carried into the refrigerant path was solved, achieving efficient recovery of lubricating oil and improving system energy efficiency and stability.
Patent Information
- Application Number
- CN202512032181.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-03-03
AI Technical Summary
In traditional scroll compressors, lubricating oil leaks through the gaps in the upper bearing and intersects with the refrigerant path, causing lubricating oil to be carried into the scroll plate, increasing the amount of oil discharged.
A multi-stage oil return channel system utilizing a crankshaft rotor assembly is designed, including first, second, and third oil return channels and corresponding cavities and guide holes, to construct a stepped temporary storage and orderly flow return path, and to block the refrigerant flow from blowing onto the oil through a baffle ring.
It effectively reduces lubricant consumption, improves system energy efficiency and operational stability, extends equipment life, and reduces maintenance costs.
Smart Images
Figure CN121593992A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of scroll compressor technology, and more particularly to an oil return channel and oil return method using a crankshaft rotor assembly. Background Technology
[0002] Traditional scroll compressors typically guide refrigerant through the motor to cool it. At this time, the lubricating oil leaking from the upper bearing gap will cross the path of the flowing refrigerant, causing this part of the lubricating oil to be carried into the scroll plate, resulting in an increased oil discharge. Summary of the Invention
[0003] The present invention aims to solve the above-mentioned problems and provides an oil return channel and oil return method using a crankshaft rotor assembly.
[0004] The technical solution adopted by this invention to solve the above-mentioned technical problems is: an oil return channel using a crankshaft rotor assembly, wherein the upper support plate and the lower support plate are fixedly connected inside the housing of a scroll compressor, an oil sump is located below the lower support plate, the top of the crankshaft is rotatably connected to the upper support plate, the bottom of the crankshaft is rotatably connected to the lower support plate, the rotor and the lower balance block assembly are sequentially fixed to the middle of the crankshaft from top to bottom, including a baffle ring, a first oil return channel, a second oil return channel, a third oil return channel, a first cavity, a second cavity, a third cavity, a first guide hole, and a second guide hole, wherein the first oil return channel is provided between the upper support plate and the crankshaft. A first cavity is formed at the top of the rotor, and a first oil return channel is connected to the first cavity. A second oil return channel is formed inside the rotor and is connected to the first cavity. A second cavity is formed at the bottom of the rotor and is connected to the second oil return channel. A third cavity is formed on the lower balance block assembly, and the second cavity is connected to the third cavity. A first guide hole is formed at the bottom of the lower balance block assembly and is connected to the third cavity. An air baffle ring is fixed to the lower support, and a gap is formed between the air baffle ring and the lower balance block assembly, which constitutes the third oil return channel. A second guide hole is formed on the crankshaft and is connected to the third oil return channel.
[0005] Furthermore, the cross-section of the air baffle ring is L-shaped.
[0006] Furthermore, the short side of the air baffle ring is fixedly connected to the lower support plate, and the long side of the air baffle ring is higher than the first guide hole in the vertical direction.
[0007] Furthermore, an annular retaining ring is fixedly attached to the top of the long side of the air baffle ring.
[0008] A method for oil return using an oil return channel provided in a crankshaft rotor assembly includes the following steps: S1: The oil flows out along the first return oil channel and into the first cavity; S2: The oil flows out of the first cavity and flows into the second cavity along the second return oil channel; S3: The oil flows into the third cavity; S4: The oil flows out of the third cavity and into the third return oil channel through the first guide hole; S5: The oil flows out of the third return oil channel and into the oil tank through the second guide hole.
[0009] Compared with the prior art, the present invention has the following advantages: This invention constructs a multi-stage oil return path by setting up a first, second, and third oil return channel. This allows lubricating oil that may leak from the upper bearing gap to be effectively collected and guided back to the oil sump, preventing it from being carried away with the refrigerant circulation and thus significantly reducing the system's oil discharge. This design not only reduces lubricating oil consumption and ensures long-term lubrication reliability but also improves the compressor's energy efficiency and operational stability, helping to extend equipment life and reduce maintenance costs. This invention constructs a staged temporary storage and orderly flow return oil system by setting up a first cavity, a second cavity, and a third cavity, which work in conjunction with corresponding return oil channels. Each cavity forms a buffer and temporary storage node in the return oil path, allowing lubricating oil to accumulate in segments and flow smoothly, effectively avoiding oil circuit congestion or poor return flow. This structure significantly optimizes the rationality and continuity of the return oil channel, enabling lubricating oil to return to the oil sump efficiently and controllably even in complex flow channels, thereby greatly improving return oil efficiency and system operational stability, reducing oil loss, and enhancing the overall reliability and energy efficiency of the device. This invention, by incorporating a baffle ring, effectively prevents the high-speed refrigerant flow from directly blowing away locally accumulated oil, thus avoiding the oil being re-entrained by the refrigerant flow and entering the compression chamber. This design significantly reduces lubricant circulation losses, thereby keeping the oil discharge rate low. Reducing oil discharge not only directly lowers the system's lubricant consumption and ensures long-term lubrication reliability, but also helps improve overall energy efficiency and system stability. Attached Figure Description
[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0011] Figure 1 This is a first-view schematic diagram of the oil return channel in this invention; Figure 2This is a second-view schematic diagram of the oil return channel in this invention; Figure 3 This is a schematic diagram showing the positions of the lower balance block and the first guide hole in this invention; Figure 4 This is a top view of the lower balancing block in this invention; Figure 5 This is a side view of the lower balancing block in this invention; Figure 6 This is the front view of the fill block in this invention; Figure 7 This is a top view of the filler block in this invention; Figure 8 This is a side view of the filler block in this invention; Figure 9 This is a schematic diagram showing the positional relationship between the first cavity, the second oil return channel, and the second cavity in this invention; Figure 10 This is a schematic diagram showing the positional relationship between the rotor and the second return oil channel in this invention; In the diagram: 1. Upper support plate; 2. Crankshaft; 3. Rotor; 4. Filler block; 5. Lower support plate; 6. Air baffle ring; 7. Lower balance block; 8. First oil return channel; 9. Second oil return channel; 10. Third oil return channel; 11. First cavity; 12. Second cavity; 13. Third cavity; 14. First guide hole; 15. Second guide hole; 16. Annular retaining ring; 29. Oil sump. Detailed Implementation
[0012] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0014] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0015] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0016] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0017] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0018] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.
[0019] See appendix Figure 1-10This embodiment describes an oil return channel utilizing a crankshaft rotor assembly. The upper support plate 1 and lower support plate 5 are fixedly connected inside the casing of a scroll compressor. Below the lower support plate 5 is an oil sump 29. The top of the crankshaft 2 is rotatably connected to the upper support plate 1, and the bottom of the crankshaft 2 is rotatably connected to the lower support plate 5. The rotor 3 and the lower balance block assembly are sequentially fixed from top to bottom in the middle of the crankshaft 2. The assembly includes a baffle ring 6, a first oil return channel 8, a second oil return channel 9, a third oil return channel 10, a first cavity 11, a second cavity 12, a third cavity 13, a first guide hole 14, and a second guide hole 15. The first oil return channel 8 is provided between the upper support plate 1 and the crankshaft 2. The top of the rotor 3 has a first oil return channel 8. A cavity 11 is formed, with the first oil return channel 8 communicating with it. A second oil return channel 9 communicating with the first cavity 11 is formed inside the rotor 3. A second cavity 12 is formed at the bottom of the rotor 3, communicating with the second oil return channel 9. A third cavity 13 is formed on the lower balance block assembly, communicating with the second cavity 12. A first guide hole 14 communicating with the third cavity 13 is formed at the bottom of the lower balance block assembly. An air baffle ring 6 is fixed to the lower support, with a gap between the air baffle ring 6 and the lower balance block assembly, forming a third oil return channel 10. A second guide hole 15 is formed on the crankshaft 2, communicating with the third oil return channel 10. The second oil return channel 9 on the rotor 3 generates a downward force when rotating, promoting smoother downward flow of the oil. Specifically, the lower balance block assembly includes a lower balance block 7 and a supplementary block 4. The lower balance block 7 has a circular hole for assembly at its center, a semi-circular ring on one side, and a fan-shaped counterweight on the other side. The side wall of the fan-shaped counterweight has a threaded hole and a first guide hole. The cross-section of the supplementary block 4 is a semi-circular ring with a stepped groove on its inner side and a through hole on its side wall. The lower balance block 7 and the supplementary block 4 are fixed together with screws. The supplementary block 4 and the lower balance block 7 have the same radius. The lower end face of the supplementary block 4 is flush with the lower end face of the lower balance block 7. The inner surface of the supplementary block 4 is connected to the inner surface of the lower balance block 7. The lower balance block 7 and the supplementary block 4 together form a third cavity 13. The lower end face of the rotor 3 is pressed and sealed with the upper end face of the lower balance block 7, and the lower end face of the rotor 3 is also pressed and sealed with the upper end face of the supplementary block 4. The filler block 4 is made of non-metallic material, and the lower support plate 5 has through holes. The air baffle ring 6 is made of thin sheet iron.
[0020] This invention constructs a multi-stage oil return path by setting up a first oil return channel 8, a second oil return channel 9, and a third oil return channel 10. This allows lubricating oil that may leak from the upper bearing gap to be effectively collected and guided back to the oil sump 29, preventing it from being carried away with the refrigerant circulation and thus significantly reducing the system's oil discharge. This design not only reduces unnecessary lubricating oil consumption and ensures long-term lubrication reliability, but also improves the compressor's energy efficiency and operational stability, helping to extend equipment life and reduce maintenance costs. Furthermore, this invention constructs a tiered storage and orderly flow oil return system by setting up a first cavity 11, a second cavity 12, and a third cavity 13, which work in conjunction with the corresponding oil return channels. Each cavity forms a buffer and storage node in the oil return path, allowing lubricating oil to accumulate in segments and flow smoothly, effectively preventing oil circuit congestion or poor return flow. This structure significantly optimizes the rationality and continuity of the oil return channel, enabling lubricating oil to return to the oil sump 29 efficiently and controllably even within complex flow channels. This greatly improves oil return efficiency and system operational stability, reduces oil loss, and enhances the overall reliability and energy efficiency of the device. By incorporating a baffle ring 6, this invention effectively prevents the high-speed refrigerant flow from directly blowing away locally accumulated oil, avoiding the oil being re-entrained by the refrigerant flow and re-entering the compression chamber. This design significantly reduces lubricating oil circulation losses, thereby controlling the oil discharge to a low level. Reducing oil discharge not only directly reduces the system's lubricating oil consumption and ensures long-term lubrication reliability, but also contributes to improving overall energy efficiency and system stability.
[0021] The cross-section of the air baffle ring 6 is L-shaped.
[0022] The short side of the baffle ring 6 is fixedly connected to the lower support plate 5, and the long side of the baffle ring 6 is higher than the first guide hole 14 in the vertical direction. By utilizing the high position of the long side of the baffle ring 6, the oil is fully guided to the third oil return channel 10, thereby significantly improving the oil return efficiency and operational stability.
[0023] An annular retaining ring 16 is fixedly connected to the top of the long side of the air baffle ring 6. The annular retaining ring 16 improves the sealing between the lower balance block assembly and the air baffle ring 6, effectively preventing cross-flow.
[0024] A method for oil return using an oil return channel provided in a crankshaft rotor assembly includes the following steps: S1: The oil flows out along the first return oil channel 8 and into the first cavity 11; S2: The oil flows out of the first cavity 11 and flows into the second cavity 12 along the second return oil channel 9; S3: The oil flows into the third cavity 13; S4: The oil flows out of the third cavity 13 and into the third return oil channel 10 through the first guide hole 14; S5: The oil flows out of the third return oil channel 10 and into the oil tank 29 through the second guide hole 15.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. An oil return channel using a crankshaft rotor assembly, wherein an upper support plate (1) and a lower support plate (5) are fixedly connected inside the housing of a scroll compressor, an oil sump (29) is located below the lower support plate (5), the top of the crankshaft (2) is rotatably connected to the upper support plate (1), the bottom of the crankshaft (2) is rotatably connected to the lower support plate (5), and the rotor (3) and the lower balance block assembly are sequentially fixed from top to bottom in the middle of the crankshaft (2), characterized in that: The rotor (3) includes a baffle ring (6), a first oil return channel (8), a second oil return channel (9), a third oil return channel (10), a first cavity (11), a second cavity (12), a third cavity (13), a first guide hole (14), and a second guide hole (15). The first oil return channel (8) is provided between the upper support plate (1) and the crankshaft (2). The first cavity (11) is opened at the top of the rotor (3). The first oil return channel (8) is connected to the first cavity (11). The second oil return channel (9) is opened inside the rotor (3) and is connected to the first cavity (11). The bottom of the rotor (3) is opened... A second cavity (12) is provided and connected to the second oil return channel (9). A third cavity (13) is provided on the lower balance block assembly. The second cavity (12) and the third cavity (13) are connected. A first guide hole (14) connected to the third cavity (13) is opened at the bottom of the lower balance block assembly. The air baffle ring (6) is fixed to the lower support. A gap is formed between the air baffle ring (6) and the lower balance block assembly. The gap constitutes the third oil return channel (10). A second guide hole (15) is opened on the crankshaft (2). The second guide hole (15) is connected to the third oil return channel (10).
2. The oil return channel provided by the crankshaft rotor assembly according to claim 1, characterized in that: The cross-section of the air baffle ring (6) is L-shaped.
3. The oil return channel provided by the crankshaft rotor assembly according to claim 2, characterized in that: The short side of the air baffle ring (6) is fixed to the lower support plate (5), and the long side of the air baffle ring (6) is higher than the first guide hole (14) in the vertical direction.
4. The oil return channel provided by the crankshaft rotor assembly according to claim 3, characterized in that: The top of the long side of the air baffle ring (6) is fixed with an annular retaining ring (16).
5. A method for returning oil using a return oil channel provided in a crankshaft rotor assembly as described in any one of claims 1 to 4, characterized in that: S1: The oil flows out along the first return oil channel (8) and into the first cavity (11); S2: The oil flows out of the first cavity (11) and flows into the second cavity (12) along the second return oil channel (9); S3: The oil flows into the third cavity (13); S4: The oil flows out of the third cavity (13) and flows into the third return oil channel (10) through the first guide hole (14). S5: The oil flows out of the third return oil channel (10) and flows into the oil pool (29) through the second guide hole (15).