Rotary compressor and refrigeration device

Abstract

This invention relates to the field of rotary compressor technology, specifically disclosing a rotary compressor and refrigeration equipment. The rotary compressor includes a housing and a compression assembly disposed within the housing. The compression assembly includes a cylinder body, a piston, a drive motor, and a crankshaft. The piston is eccentrically rotatably disposed within the compression chamber of the cylinder body. The crankshaft is connected to the piston, and the drive motor is driven by the crankshaft to rotate the piston. The inner diameter of the cylinder body is Dc, and the outer diameter of the drive motor is Dm. Therefore, 2.24 ≤ Dm / Dc ≤ 3.15. By limiting the ratio of the inner diameter Dc of the cylinder body to the outer diameter Dm of the drive motor within the above-mentioned range, this design minimizes the inner diameter Dc of the cylinder body during the rotary compressor design process, while ensuring stable operation. This reduces radial leakage, lowers frictional losses, improves compressor performance, lowers compressor power consumption, and optimizes the overall performance of the compressor.

Description

Technical Field

[0001] This invention relates to the field of rotary compressor technology, and more particularly to a rotary compressor and refrigeration equipment. Background Technology

[0002] Currently, in the research of rotary compressors, leakage and friction losses have always been important indicators affecting the performance and reliability of rotary compressors. Specifically, the lower the leakage and friction losses during compressor operation, the higher the compressor's system COP (Coefficient of Performance). Without changing the dimensions of other important components, reducing the cylinder bore can reduce radial clearance leakage and sliding friction losses between the piston and cylinder under the same conditions. Therefore, there is an urgent need to design a two-cylinder rotary compressor and refrigeration equipment to optimize the existing cylinder bore, reduce leakage, lower losses, and thus improve the compressor's performance and reliability. Summary of the Invention

[0003] The purpose of this invention is to provide a rotary compressor and refrigeration equipment that can reduce leakage and losses, thereby improving the performance and reliability of the compressor.

[0004] On one hand, the present invention provides a rotary compressor, which includes a housing and a compression assembly disposed within the housing. The compression assembly includes a cylinder body, a piston, a drive motor and a crankshaft. The piston is eccentrically rotatably disposed within the compression chamber of the cylinder body. The piston is fixedly sleeved on the crankshaft (4). The drive motor (3) can drive the crankshaft (4) to rotate the piston. The inner diameter of the cylinder body is Dc, and the outer diameter of the drive motor is Dm, wherein Dc and Dm satisfy: 2.24≤Dm / Dc≤3.15.

[0005] As an optional technical solution for rotary compressors, the outer diameter of the outer shell that cooperates with the cylinder body is Ds, where Dc and Ds satisfy: 2.38≤Ds / Dc≤3.36.

[0006] As an optional technical solution for a rotary compressor, the crankshaft has a long shaft with a diameter of Dsh, wherein Dc and Dsh satisfy: 2.12≤Dc / Dsh≤3.52.

[0007] As an optional technical solution for a rotary compressor, the crankshaft includes a long shaft, an eccentric shaft, and a short shaft connected sequentially along the axial direction. The drive motor is connected to the long shaft, the piston is sleeved on the eccentric shaft, and the short shaft is rotatably connected to the cylinder body.

[0008] As an optional technical solution for a rotary compressor, the crankshaft has a central oil hole, which is axially disposed within the crankshaft and extends from the short shaft to the long shaft. The central oil hole is used to deliver lubricating oil.

[0009] As an optional technical solution for a rotary compressor, the central oil hole includes a first hole section and a second hole section that are interconnected. The diameter of the first hole section is larger than the diameter of the second hole section. The first hole section extends from the short axis to the long axis, and the second hole section is located on the long axis.

[0010] As an optional technical solution for a rotary compressor, the crankshaft has at least one radial hole, the radial hole being disposed on the long shaft and communicating with the second hole segment; and / or, the radial hole being disposed on the eccentric shaft and communicating with the first hole segment; and / or, the radial hole being disposed on the short shaft and communicating with the first hole segment.

[0011] As an optional technical solution for the rotary compressor, the rotary compressor further includes an upper cover and a lower cover, wherein the upper cover is connected to the top of the outer casing and the lower cover is connected to the bottom of the outer casing.

[0012] As an optional technical solution for rotary compressors, the drive motor includes a stator and a rotor coaxially disposed within the stator. The stator is fixedly disposed within the housing, and the rotor is drivenly connected to the crankshaft.

[0013] On the other hand, the present invention provides a refrigeration device including a rotary compressor as described in any of the above embodiments.

[0014] The beneficial effects of this invention are as follows: This invention provides a rotary compressor, which includes a housing and a compression assembly disposed within the housing. The compression assembly includes a cylinder body, a piston, a drive motor, and a crankshaft. The piston is eccentrically rotatably disposed within the compression chamber of the cylinder body. The crankshaft is connected to the piston, and the drive motor is driven by the crankshaft to rotate the piston. The inner diameter of the cylinder body is Dc, and the outer diameter of the drive motor is Dm, wherein Dc and Dm satisfy: 2.24 ≤ Dm / Dc ≤ 3.15. By using the rotary compressor of this invention, the ratio of the inner diameter Dc of the cylinder body to the outer diameter Dm of the drive motor is limited to the above-mentioned value range. This configuration, during the design of the rotary compressor, minimizes the inner diameter Dc of the cylinder body while ensuring stable operation, thereby reducing radial leakage, lowering friction loss, improving compressor performance, reducing compressor power consumption, and optimizing the overall performance of the compressor. However, continuously reducing the inner diameter Dc of the cylinder body can lead to a situation where, with other core component dimensions remaining constant, the piston outer diameter becomes too small and the thickness too thin, resulting in poor sealing performance. In summary, the inner diameter Dc of the cylinder body in the compressor is mainly controlled by the outer diameter Dm of the drive motor to achieve optimal performance. This allows the rotary compressor of the present invention to reduce leakage and losses, thereby improving the performance and reliability of the compressor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the cylinder body in an embodiment of the present invention; Figure 2 This is a schematic diagram of the outer shell in an embodiment of the present invention; Figure 3 This is a schematic diagram of the drive motor in an embodiment of the present invention; Figure 4 This is a schematic diagram of the crankshaft structure in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the coefficient of performance of a refrigeration unit (COP) under different schemes of the rotary compressor in the new national standard according to embodiments of the present invention. Figure 6 This is a schematic diagram of the coefficient of performance of the refrigeration unit under different schemes for low-temperature heating in the embodiments of the present invention; Figure 7 This is a schematic diagram showing the coefficient of performance (COP) of the refrigeration unit under different schemes during intermediate refrigeration in an embodiment of the present invention.

[0016] In the picture: 1. Housing; 2. Cylinder body; 3. Drive motor; 4. Crankshaft; 41. Long shaft; 42. Eccentric shaft; 43. Short shaft; 44. Center oil hole; 441. First hole section; 442. Second hole section; 443. Radial hole. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1 to 7As shown, this embodiment provides a rotary compressor, which includes a housing 1 and a compression assembly disposed within the housing 1. The compression assembly includes a cylinder body 2, a piston, a drive motor 3, and a crankshaft 4. The piston is eccentrically rotatably disposed within the compression chamber of the cylinder body 2. The crankshaft 4 is connected to the piston, and the drive motor 3 is drivenly connected to the crankshaft 4 to drive the piston to rotate. The inner diameter of the cylinder body 2 is Dc, and the outer diameter of the drive motor 3 is Dm, wherein Dc and Dm satisfy: 2.24≤Dm / Dc≤3.15.

[0022] The rotary compressor of this invention limits the ratio of the inner diameter Dc of the cylinder body 2 to the outer diameter Dm of the drive motor 3 within the aforementioned range. This design, while ensuring stable operation during the rotary compressor design process, minimizes the inner diameter Dc of the cylinder body 2 to reduce radial leakage, decrease frictional losses, improve compressor performance, reduce power consumption, and optimize overall compressor performance. However, continuously reducing the inner diameter Dc of the cylinder body 2 can lead to an excessively small piston outer diameter and thickness, resulting in poor sealing performance, even with other core component dimensions remaining constant. Therefore, the inner diameter Dc of the cylinder body 2 in the compressor is primarily controlled using the outer diameter Dm of the drive motor 3 to achieve optimal performance. This allows the rotary compressor of this invention to reduce leakage and losses, thereby improving compressor performance and reliability.

[0023] Furthermore, to further reduce leakage and losses, thereby improving the performance and reliability of the compressor, in this embodiment, the outer diameter of a portion of the outer shell 1 that mates with the cylinder body 2 is Ds, where Dc and Ds satisfy: 2.38 ≤ Ds / Dc ≤ 3.36. This setting limits the ratio of the outer diameter Ds of the outer shell 1 that mates with the cylinder body 2 to the inner diameter Dc of the cylinder body 2 within the aforementioned range, further restricting the size of the inner diameter Dc of the cylinder body 2, thereby reducing leakage and losses, and ultimately improving the performance and reliability of the compressor.

[0024] In this embodiment, the crankshaft 4 has a major shaft 41 with a diameter of Dsh, where Dc and Dsh satisfy: 2.12 ≤ Dc / Dsh ≤ 3.52. This configuration limits the ratio of the major shaft diameter Dsh to the inner diameter Dc of the cylinder body 2 within the aforementioned range, further restricting the size of the inner diameter Dc of the cylinder body 2. This reduces leakage and losses, thereby improving the performance and reliability of the compressor.

[0025] Preferably, the inner diameter Dc of the cylinder body 2 is comprehensively controlled by using the outer diameter Ds of the outer shell 1 that mates with the cylinder body 2, the outer diameter Dm of the drive motor 3, and the shaft diameter Dsh of the long shaft 41, which can achieve optimal results.

[0026] It should be noted that, as shown in Table 1, the specific implementation values ​​of the new national standard COP, low-temperature heating COP, and intermediate cooling COP under different schemes are provided.

[0027] Table 1: COP values ​​for the new national standard, low-temperature heating, and intermediate cooling under different schemes like Figure 5 The diagram shows the COP values ​​under different schemes in the new national standard. Figure 6 The diagram shows the COP values ​​for low-temperature heating under different schemes, as shown below. Figure 7 The diagram shows the intermediate refrigeration COP values ​​under different schemes. It can be seen that the rotary compressor of this application can effectively improve the performance and reliability of the compressor.

[0028] In this embodiment, the crankshaft 4 includes a long shaft 41, an eccentric shaft 42, and a short shaft 43 connected sequentially along the axial direction. The drive motor 3 is connected to the long shaft 41, the piston is sleeved on the eccentric shaft 42, and the short shaft 43 is rotatably connected to the cylinder body 2. This facilitates the use of the drive motor 3 and the long shaft 41 to drive the piston to rotate.

[0029] Furthermore, the crankshaft 4 has a central oil hole 44, which is axially disposed inside the crankshaft 4 and extends from the short shaft 43 to the long shaft 41, so that lubricating oil can be delivered using the central oil hole 44.

[0030] In some embodiments, the central oil hole 44 includes a first section 441 and a second section 442 that are interconnected. The diameter of the first section 441 is larger than the diameter of the second section 442. The first section 441 extends from the minor axis 43 to the major axis 41, and the second section 442 is located on the major axis 41. This facilitates the delivery of lubricating oil to a designated location.

[0031] In this embodiment, the crankshaft 4 has at least one radial hole 443, which is disposed on the long shaft 41 and communicates with the second hole segment 442; and / or, the radial hole 443 is disposed on the eccentric shaft 42 and communicates with the first hole segment 441; and / or, the radial hole 443 is disposed on the short shaft 43 and communicates with the first hole segment 441. This arrangement allows lubricating oil to reach a designated location through the radial hole 443.

[0032] In this embodiment, the rotary compressor also includes an upper cover and a lower cover. The upper cover is connected to the top of the outer casing 1, and the lower cover is connected to the bottom of the outer casing 1. This facilitates sealing the outer casing 1.

[0033] In some embodiments, the drive motor 3 includes a stator and a rotor coaxially disposed within the stator. The stator is fixedly disposed within the housing 1, and the rotor is drivenly connected to the crankshaft 4. In this way, the rotor can drive the crankshaft 4 to rotate.

[0034] This embodiment also provides a refrigeration device, including the rotary compressor described above. Using the refrigeration device of this invention, the ratio of the inner diameter Dc of the cylinder body 2 to the outer diameter Dm of the drive motor 3 is limited to the aforementioned numerical range. This setting, during the rotary compressor design process, ensures stable operation while minimizing the inner diameter Dc of the cylinder body 2, thereby reducing radial leakage, lowering frictional losses, improving compressor performance, reducing compressor power consumption, and optimizing the overall performance of the compressor. However, continuously reducing the inner diameter Dc of the cylinder body 2 can lead to a situation where, with other core component dimensions remaining unchanged, the piston outer diameter is too small and the thickness too thin, resulting in poor sealing performance. In summary, the inner diameter Dc of the cylinder body 2 in the compressor is primarily controlled using the outer diameter Dm of the drive motor 3 to achieve optimal results, enabling the refrigeration device of this invention to reduce leakage and losses, thereby improving the performance and reliability of the compressor.

[0035] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rotary compressor, comprising a housing (1) and a compression assembly disposed within the housing (1), the compression assembly comprising a cylinder body (2), a piston, a drive motor (3), and a crankshaft (4), wherein the piston is eccentrically rotatably disposed within the compression chamber of the cylinder body (2), the piston is fixedly sleeved on the crankshaft (4), and the drive motor (3) is capable of driving the crankshaft (4) to rotate the piston, characterized in that, The inner diameter of the cylinder body (2) is Dc, and the outer diameter of the drive motor (3) is Dm, wherein Dc and Dm satisfy: 2.24≤Dm / Dc≤3.

15.

2. The rotary compressor according to claim 1, characterized in that, The outer diameter of the outer shell (1) that cooperates with the cylinder body (2) is Ds, wherein Dc and Ds satisfy: 2.38≤Ds / Dc≤3.

36.

3. The rotary compressor according to claim 2, characterized in that, The crankshaft (4) has a long shaft (41) with a diameter of Dsh, wherein Dc and Dsh satisfy: 2.12≤Dc / Dsh≤3.

52.

4. The rotary compressor according to any one of claims 1-3, characterized in that, The crankshaft (4) includes a long shaft (41), an eccentric shaft (42) and a short shaft (43) connected in sequence along the axial direction. The drive motor (3) is connected to the long shaft (41). The piston is sleeved on the eccentric shaft (42). The short shaft (43) is rotatably connected to the cylinder body (2).

5. The rotary compressor according to claim 4, characterized in that, The crankshaft (4) has a central oil hole (44) which is axially disposed within the crankshaft (4) and extends from the short shaft (43) to the long shaft (41). The central oil hole (44) is used to deliver lubricating oil.

6. The rotary compressor according to claim 5, characterized in that, The central oil hole (44) includes a first hole segment (441) and a second hole segment (442) that are interconnected. The diameter of the first hole segment (441) is larger than the diameter of the second hole segment (442). The first hole segment (441) extends from the short axis (43) to the long axis (41), and the second hole segment (442) is located on the long axis (41).

7. The rotary compressor according to claim 6, characterized in that, The crankshaft (4) has at least one radial hole (443) disposed on the long shaft (41) and communicating with the second hole segment (442); and / or, the radial hole (443) disposed on the eccentric shaft (42) and communicating with the first hole segment (441); and / or, the radial hole (443) disposed on the short shaft (43) and communicating with the first hole segment (441).

8. The rotary compressor according to any one of claims 1-3, characterized in that, The rotary compressor also includes an upper cover and a lower cover, the upper cover being connected to the top of the outer casing (1), and the lower cover being connected to the bottom of the outer casing (1).

9. The rotary compressor according to any one of claims 1-3, characterized in that, The drive motor (3) includes a stator and a rotor coaxially disposed within the stator. The stator is fixedly disposed within the housing (1), and the rotor is drivenly connected to the crankshaft (4).

10. A refrigeration device, characterized in that, Includes the rotary compressor as described in any one of claims 1-9.

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