Rotary compressor, heat pump system and air conditioner

Abstract

The application discloses a rotary compressor, a heat pump system and an air conditioner, and relates to the technical field of compressors. The rotary compressor comprises a cylinder, a piston and a crankshaft. The diameter of the compression chamber is D, the height of the compression chamber in the axial direction is H, the effective matching length of the crankshaft and the piston is L, the first performance value of the rotary compressor is P, and the following conditions are met: 86 < P < 103. The rotary compressor of the embodiment of the application sets the first performance value of the rotary compressor as P, makes P meet the condition of 86 < P < 103, avoids the first performance value of the rotary compressor being too small or too large, avoids the height-diameter ratio of the cylinder being too small or too large, avoids the effective matching length of the crankshaft and the piston being too small or too large, effectively avoids the increase of the friction loss, and is beneficial to improving the mechanical efficiency and the energy efficiency of the rotary compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more particularly to a rotary compressor, a heat pump system, and an air conditioner. Background Technology

[0002] With increasingly stringent environmental regulations both domestically and internationally, alkane-based environmentally friendly refrigerants, especially propane (R290), will become the mainstream refrigerant for future air conditioning and heat pump systems. As a core component of air conditioning and heat pump systems, achieving high efficiency in R290 compressors is essential.

[0003] Due to the differences in the physical properties of R290 refrigerant compared to R32 and R22, R290 rotary compressors have a smaller operating pressure differential and less leakage between moving parts. However, R290 compressors have a larger displacement, larger crankshaft diameter, larger crankshaft eccentricity, and larger cylinder height, resulting in greater pump body friction losses and consequently, lower compressor performance, leaving room for improvement. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a rotary compressor that avoids an excessively small or large cylinder height-to-diameter ratio, and also avoids an excessively small or large effective mating length between the crankshaft and piston, thereby effectively preventing increased frictional losses and improving the overall mechanical efficiency and energy efficiency of the rotary compressor.

[0005] A rotary compressor according to an embodiment of the present invention includes: a cylinder having a compression chamber formed therein; a piston rotatably mounted within the compression chamber; and a crankshaft, at least a portion of which extends into the compression chamber and is fixedly disposed therethrough with the piston; wherein the diameter of the compression chamber is [missing information]. And the height along the axial direction is The effective mating length between the crankshaft and the piston is The first performance value of the rotary compressor is And satisfy: 86< <103.

[0006] According to an embodiment of the present invention, a rotary compressor has a compression chamber formed inside a cylinder, a piston is rotatably mounted inside the compression chamber, and at least a portion of a crankshaft extends into the compression chamber and is fixed to the piston, so that the crankshaft can drive the piston to rotate inside the compression chamber to compress the gas inside the compression chamber, thereby realizing the gas compression function of the rotary compressor. Furthermore, a first performance value of the rotary compressor is set to... ,make And let Between 86 and 103, the range of the first performance value of the rotary compressor can be limited to limit the cylinder height-to-diameter ratio and the effective mating length between the crankshaft and the piston. This can prevent the first performance value of the rotary compressor from being too small or too large, thereby preventing the cylinder height-to-diameter ratio from being too small or too large, and also preventing the effective mating length between the crankshaft and the piston from being too small or too large. This can effectively prevent the increase of friction loss and help improve the overall mechanical efficiency and energy efficiency of the rotary compressor.

[0007] According to some embodiments of the present invention, in a rotary compressor, the crankshaft includes a main shaft section and an eccentric section connected sequentially along the axial direction. The main shaft section is adapted to be powered by an electric motor, and the eccentric section passes through the interior of the piston to drive the piston to move eccentrically.

[0008] According to some embodiments of the rotary compressor of the present invention, the crankshaft further includes a secondary shaft section connected to the side of the eccentric section opposite to the main shaft section, and the secondary shaft section is adapted to pass through a bearing.

[0009] According to some embodiments of the rotary compressor of the present invention, the number of cylinders is: And satisfy: =1 or =2.

[0010] According to some embodiments of the rotary compressor of the present invention, the shaft diameter of the main shaft section is... The shaft diameter of the secondary shaft section is The second performance value of the rotary compressor is And satisfy: ,26< <31.

[0011] According to some embodiments of the rotary compressor of the present invention, the axis of the eccentric section is offset from the axis of the main shaft section along the radial direction of the crankshaft; and / or, the axis of the eccentric section is offset from the axis of the auxiliary shaft section along the radial direction of the crankshaft.

[0012] According to some embodiments of the present invention, in a rotary compressor, the motor includes a stator and a rotor, the rotor being located within the stator and sleeved on at least a portion of the crankshaft away from the piston, to selectively drive the piston to rotate.

[0013] According to some embodiments of the present invention, the rotary compressor further includes a compressor housing, wherein the cylinder, the motor and the crankshaft are all mounted within the compressor housing.

[0014] The present invention also proposes a heat pump system.

[0015] The heat pump system according to embodiments of the present invention includes the rotary compressor described in any of the above embodiments.

[0016] The present invention also proposes an air conditioner.

[0017] An air conditioner according to an embodiment of the present invention includes a rotary compressor as described in any of the above embodiments.

[0018] The advantages of the air conditioner, the heat pump system, and the rotary compressor mentioned above compared to the prior art are the same, and will not be elaborated here.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the installation of the cylinder and piston according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the installation of the cylinder and piston according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the crankshaft according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a rotary compressor according to an embodiment of the present invention; Figure 5 This is a graph showing the relationship between the energy efficiency and a first performance value of a rotary compressor according to an embodiment of the present invention; Figure 6 This is a graph showing the relationship between the energy efficiency and the second performance value of a rotary compressor according to an embodiment of the present invention.

[0021] Figure label: Rotary compressor 100, Cylinder 1, compression chamber 11, piston 2, crankshaft 3, main shaft section 31, eccentric section 32, auxiliary shaft section 33, motor 4, stator 41, rotor 42, compressor housing 5. Detailed Implementation

[0022] 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.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] 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.

[0025] The following is for reference. Figures 1-6 The rotary compressor 100 described in this embodiment of the invention can avoid the cylinder 1 having an excessively small or large height-to-diameter ratio, and can also avoid the crankshaft 3 and piston 2 having an excessively small or large effective mating length, thereby effectively avoiding the increase of friction loss and improving the overall mechanical efficiency and energy efficiency of the rotary compressor 100.

[0026] like Figures 1-4 As shown, a rotary compressor 100 according to an embodiment of the present invention includes: a cylinder 1, a piston 2 and a crankshaft 3.

[0027] A compression chamber 11 is formed inside the cylinder 1; a piston 2 is rotatably mounted inside the compression chamber 11; at least a portion of the crankshaft 3 extends into the compression chamber 11 and is fixed to the piston 2; wherein, the diameter of the compression chamber 11 is... And the height along the axial direction is The effective mating length between crankshaft 3 and piston 2 is The first performance value of the rotary compressor 100 is And satisfy: 86< <103.

[0028] Specifically, the rotary compressor 100 is a positive displacement compressor that compresses gas by changing the volume of its chamber. It can be used to compress gaseous refrigerants and is a core piece of equipment in refrigeration, industrial gas supply, and other fields. The rotary compressor 100 includes a cylinder 1, a piston 2, and a crankshaft 3, as shown below. Figures 1-2 As shown, a compression chamber 11 is formed inside the cylinder 1, that is, the cylinder 1 can be used to provide a sealed compression space so that the gas can be compressed inside it. The piston 2 is rotatably installed in the compression chamber 11, that is, the piston 2 is placed inside the compression chamber 11 so that the piston 2 can rotate relative to the cylinder 1, so that the gas in the compression chamber 11 is squeezed while rotating, thereby compressing the gas in the compression chamber 11, thereby realizing the gas compression function of the rotary compressor 100.

[0029] The crankshaft 3 is used to transmit power to the piston 2, so as to drive the piston 2 to rotate in the compression chamber 11 and compress the gas in the compression chamber 11. At least a part of the crankshaft 3 is extended into the compression chamber 11 and fixed to the piston 2. This allows part or all of the crankshaft 3 to be extended into the interior of the compression chamber 11, so that the crankshaft 3 can move closer to the piston 2. This makes it easier to extend at least a part of the crankshaft 3 into the compression chamber 11 and further into the interior of the piston 2, so that the crankshaft 3 can be connected to the piston 2. This achieves the power connection between the crankshaft 3 and the piston 2, allowing the crankshaft 3 to transmit power to the piston 2, thereby allowing the piston 2 to rotate in the compression chamber 11 to compress the gas in the compression chamber 11. The crankshaft 3 and the piston 2 can be fixedly connected to ensure the connection strength and reliability between the two, thereby ensuring the reliability of the power transmission from the crankshaft 3 to the piston 2.

[0030] The compression chamber 11 is cylindrical in shape, and its diameter can be set as follows: And the height along the axial direction is , The height-to-diameter ratio of cylinder 1 refers to the ratio of the effective axial working length of cylinder 1 to the inner diameter of cylinder 1. If the height-to-diameter ratio of cylinder 1 is too small, cylinder 1 will have a large diameter and short axial structure. If the height-to-diameter ratio of cylinder 1 is too large, cylinder 1 will have a small diameter and long axial structure. Both too small and too large height-to-diameter ratios of cylinder 1 will lead to increased friction loss through different paths, resulting in a decrease in the overall mechanical efficiency of the rotary compressor 100 and a deterioration in energy efficiency.

[0031] The effective mating length between crankshaft 3 and piston 2 refers to the axial contact length between the outer circle of the mating section of crankshaft 3 and piston 2 and the inner hole of piston 2, which allows for a complete fit and stable torque transmission. It is a core mating dimension ensuring the relative motion accuracy between the two. The effective mating length between crankshaft 3 and piston 2 can be defined as... If the effective mating length between crankshaft 3 and piston 2 is too small, the pressure per unit area of ​​the mating surface will increase significantly, making it difficult for the lubricating oil film to form stably. This will increase the risk of dry friction between piston 2 and crankshaft 3 and significantly increase friction loss. If the effective mating length between crankshaft 3 and piston 2 is too large, the axial contact friction area between crankshaft 3 and piston 2 will increase significantly, and the sliding friction resistance will increase directly. In other words, both too small and too large effective mating lengths between crankshaft 3 and piston 2 will lead to increased friction loss through different paths, resulting in a decrease in the overall mechanical efficiency of rotary compressor 100 and a deterioration in energy efficiency.

[0032] Thus, the first performance value of the rotary compressor 100 can be set as follows: And make That is, the first performance value of the rotary compressor 100 is directly proportional to the height-to-diameter ratio of the cylinder 1 and the effective mating length between the crankshaft 3 and the piston 2. Therefore, by limiting the range of the first performance value of the rotary compressor 100, the height-to-diameter ratio of the cylinder 1 and the effective mating length between the crankshaft 3 and the piston 2 can be limited, and... Between 86 and 103, such as The value can be 90, 95 or 100, which can prevent the first performance value of the rotary compressor 100 from being too small or too large, thereby preventing the height-to-diameter ratio of the cylinder 1 from being too small or too large, and also preventing the effective matching length between the crankshaft 3 and the piston 2 from being too small or too large. This can prevent the increase of friction loss and help improve the overall mechanical efficiency and energy efficiency of the rotary compressor 100.

[0033] It should be noted that, as Figure 5 The graph shows the relationship between the energy efficiency and the first performance value of the rotary compressor 100. It can be seen that when the first performance value of the rotary compressor 100 is less than 86, the minimum oil film thickness is larger and the energy efficiency of the rotary compressor 100 is smaller. When the first performance value of the rotary compressor 100 is greater than 103, the minimum oil film thickness is smaller, which will aggravate the wear of the crankshaft 3 and shorten the service life of the rotary compressor 100.

[0034] According to an embodiment of the present invention, a rotary compressor 100 has a compression chamber 11 formed in a cylinder 1, a piston 2 rotatably mounted in the compression chamber 11, and at least a portion of a crankshaft 3 extending into the compression chamber 11 and passing through and fixed to the piston 2, so that the crankshaft 3 can drive the piston 2 to rotate in the compression chamber 11 to compress the gas in the compression chamber 11, thereby realizing the gas compression function of the rotary compressor 100. Furthermore, a first performance value of the rotary compressor 100 is set as follows: ,make And let Between 86 and 103, the range of the first performance value of the rotary compressor 100 can be limited to limit the height-to-diameter ratio of the cylinder 1 and the effective mating length between the crankshaft 3 and the piston 2. This can prevent the first performance value of the rotary compressor 100 from being too small or too large, thereby preventing the height-to-diameter ratio of the cylinder 1 from being too small or too large, and also preventing the effective mating length between the crankshaft 3 and the piston 2 from being too small or too large. This can effectively prevent the increase of friction loss and help improve the overall mechanical efficiency and energy efficiency of the rotary compressor 100.

[0035] In some embodiments, the crankshaft 3 includes a main shaft section 31 and an eccentric section 32 connected sequentially along the axial direction. The main shaft section 31 is adapted to be powered by the motor 4, and the eccentric section 32 passes through the interior of the piston 2 to drive the piston 2 to move eccentrically.

[0036] Specifically, the crankshaft 3 is used to transmit power to the piston 2, so that the piston 2 rotates in the compression chamber 11 to compress the gas in the compression chamber 11, such as... Figures 3-4 As shown, the crankshaft 3 includes a main shaft section 31 and an eccentric section 32. The main shaft section 31 and the eccentric section 32 are connected sequentially along the axial direction of the crankshaft 3, so that the crankshaft 3 can be a whole, which is beneficial to improve the overall strength and reliability of the crankshaft 3, and allows the crankshaft 3 to have a certain length so that at least a part of the crankshaft 3 can be extended into the compression chamber 11 and poweredly connected to the piston 2.

[0037] Furthermore, by inserting the eccentric section 32 inside the piston 2 to drive the piston 2 to move eccentrically, the eccentric section 32 can be extended into the compression chamber 11 and further into the piston 2 and fixedly connected to the piston 2. This allows the crankshaft 3 to drive the piston 2 to move eccentrically within the compression chamber 11 via the eccentric section 32. This ensures that the outer circle of the piston 2 continuously rolls eccentrically along the inner wall of the cylinder 1, completing the intake, compression, and exhaust cycles through continuous volume changes. The motor 4 provides power for the rotation of the piston 2. By connecting the main shaft section 31 to the motor 4, the crankshaft 3 can obtain power from the motor 4 through the main shaft section 31 and transmit the power to the piston 2 through the eccentric section 32. In this way, the motor 4, crankshaft 3, and piston 2 can be connected in sequence, allowing the crankshaft 3 to transmit the power of the motor 4 to the piston 2, ensuring that the piston 2 can rotate within the compression chamber 11 and compress the gas within the compression chamber 11.

[0038] It is understandable that by connecting the main shaft section 31 to the motor 4 and the eccentric section 32 to the piston 2, the motor 4 and the piston 2 can be connected to different positions on the crankshaft 3, which can avoid interference between the motor 4 and the piston 2 and ensure their respective connection reliability and working reliability.

[0039] In some embodiments, the crankshaft 3 further includes a secondary shaft section 33, which is connected to the side of the eccentric section 32 opposite to the main shaft section 31, and the secondary shaft section 33 is adapted to pass through a bearing.

[0040] Specifically, the crankshaft 3 also includes a secondary shaft section 33. The secondary shaft section 33 is connected to the side of the eccentric section 32 away from the main shaft section 31. This allows the main shaft section 31, the eccentric section 32, and the secondary shaft section 33 to be connected sequentially along the axial direction of the crankshaft 3, making the crankshaft 3 a single unit. This improves the overall strength and operational reliability of the crankshaft 3. Furthermore, the main shaft section 31 and the secondary shaft section 33 can be connected to the two ends of the eccentric section 32 respectively to avoid interference between the main shaft section 31 and the secondary shaft section 33, ensuring their respective connection and operational reliability. In addition, the secondary shaft section 33 is inserted into a bearing, allowing the bearing to provide radial support to the crankshaft 3 from the secondary shaft section 33, preventing the crankshaft 3 from wobbling during rotation and ensuring the operational stability of the crankshaft 3.

[0041] It should be noted that, in practice, bearings can also be fitted on the outside of the main shaft section 31, so that the bearings outside the main shaft section 31 and the auxiliary shaft section 33 can form symmetrical support on both sides of the eccentric section 32, which can greatly reduce the deflection of the crankshaft 3 when rotating at high speed, avoid the eccentric section 32 from wobbling during operation, ensure the eccentric motion accuracy of the piston 2, and reduce the overall friction loss of the rotary compressor 100.

[0042] In some embodiments, the number of cylinders 1 is: And satisfy: =1 or =2.

[0043] Specifically, the number of cylinders 1 is a key parameter that directly determines the core performance of the rotary compressor 100. The number of cylinders 1 in the rotary compressor 100 can be configured according to the model positioning and performance requirements. Different numbers of cylinders 1 will significantly affect the overall performance of the machine from multiple dimensions. The number of cylinders 1 can be set as follows: And make The rotary compressor 100 can be a single-cylinder compressor. A single-cylinder compressor has only one cylinder 1, which has low manufacturing cost, simple assembly process, small size and light weight, and is suitable for application scenarios with more demanding space requirements, such as small household air conditioners or refrigerators.

[0044] Or, it can make The value is 2, meaning the rotary compressor 100 can be a twin-cylinder compressor. A twin-cylinder compressor includes two cylinders 1, and the compression phases of the two cylinders 1 differ by 180°. The gas forces cancel each other out, the torque fluctuation is greatly reduced, the operation is more stable, and the noise is lower. Moreover, for the same cylinder diameter, the displacement of a twin-cylinder compressor is twice that of a single-cylinder compressor, making it suitable for large-capacity applications such as large air conditioners and heat pump systems.

[0045] In this embodiment, the number of cylinders 1 can be 1 or 2, that is, the rotary compressor 100 can be a single-cylinder compressor or a double-cylinder compressor, so that the rotary compressor 100 can adapt to different application scenarios. In practice, it can be flexibly set according to specific needs and space size.

[0046] It should be noted that the more cylinders 1 there are, the easier it is for the eccentric inertial forces of each cylinder 1 to cancel each other out, which will significantly reduce the vibration amplitude of the whole machine. In addition, with the increase in the number of cylinders 1, the axial height of a single cylinder can be significantly reduced, the height-to-diameter ratio is easier to control, the force on the crankshaft 3 is more balanced, friction loss is reduced, the mechanical efficiency of the whole machine is improved, and the energy efficiency of the whole machine is improved. Furthermore, with the increase in the number of cylinders 1, the total displacement is distributed among multiple cylinders 1, the workload of a single cylinder 1 is significantly reduced, the wear rate of the piston 2 is significantly reduced, the stability of continuous operation of the whole machine is improved, and the theoretical service life can be extended. However, too many cylinders 1 will double the number of parts in the whole machine, and the structural complexity, manufacturing cost and assembly precision requirements will increase significantly. Therefore, mainstream models in household scenarios generally adopt a two-cylinder configuration, and only large-displacement industrial-grade rotary compressors use a multi-cylinder structure of three or more cylinders.

[0047] In some embodiments, the shaft diameter of the spindle segment 31 is The shaft diameter of the secondary shaft section 33 is The second performance value of the rotary compressor 100 is And satisfy: ,26< <31.

[0048] Specifically, the energy efficiency of the rotary compressor 100 exhibits a non-monotonic relationship with the crankshaft 3's diameter, initially increasing and then decreasing, indicating an optimal design range. This requires balancing friction loss and structural rigidity. Furthermore, the crankshaft 3 comprises a main shaft section 31 and a secondary shaft section 33. If the diameters of the main shaft section 31 and the secondary shaft section 33 are too large, it directly increases the contact area and frictional power consumption between the main shaft section 31 and the bearings, leading to a decrease in the rotary compressor 100's energy efficiency. Conversely, if the diameters of the main shaft section 31 and the secondary shaft section 33 are too small, it results in insufficient rigidity and increased flexural deformation of the crankshaft 3, increasing frictional power consumption and ultimately reducing the rotary compressor 100's energy efficiency. Therefore, the diameter of the main shaft section 31 can be set as... The shaft diameter of the secondary shaft section 33 is , It can be the equivalent average shaft diameter of crankshaft 3.

[0049] Thus, the second performance value of the rotary compressor 100 can be set as follows: , and make That is, the second performance value of the rotary compressor 100 is directly proportional to the height-to-diameter ratio of the cylinder 1, the number of cylinders 1, and the equivalent average shaft diameter of the crankshaft 3. Therefore, by limiting the range of the second performance value of the rotary compressor 100, the height-to-diameter ratio of the cylinder 1, the number of cylinders 1, and the equivalent average shaft diameter of the crankshaft 3 can be limited, and... Between 26 and 31, such as The value can be 27, 28, 29, or 30, which can prevent the second performance value of the rotary compressor 100 from being too small or too large. This can also prevent the height-to-diameter ratio of the cylinder 1 from being too small or too large, and can also prevent the number of cylinders 1 from being too large. It can also prevent the equivalent average shaft diameter of the crankshaft 3 from being too small or too large, thus preventing the shaft diameter of the main shaft section 31 and the shaft diameter of the auxiliary shaft section 33 from being too small or too large. This can prevent the increase of frictional power consumption and help improve the overall mechanical efficiency and energy efficiency of the rotary compressor 100.

[0050] It should be noted that, as Figure 6 The graph shows the relationship between the energy efficiency and the second performance value of the rotary compressor 100. It can be seen that when the second performance value of the rotary compressor 100 is less than 26, the minimum oil film thickness is larger and the energy efficiency of the rotary compressor 100 is smaller. When the second performance value of the rotary compressor 100 is greater than 31, the minimum oil film thickness is smaller, which will aggravate the wear of the crankshaft 3 and shorten the service life of the rotary compressor 100.

[0051] In some embodiments, the axis of the eccentric segment 32 is offset from the axis of the main shaft segment 31 in the radial direction of the crankshaft 3; and / or, the axis of the eccentric segment 32 is offset from the axis of the secondary shaft segment 33 in the radial direction of the crankshaft 3.

[0052] Specifically, the eccentric section 32 can extend into the compression chamber 11 and be poweredly connected to the piston 2, so that under the drive of the motor 4, the piston 2 can rotate eccentrically in the compression chamber 11, so that the piston 2 can squeeze the gas in the compression chamber 11 and compress the gas in the compression chamber 11. The axis of the eccentric section 32 is set to be offset from the axis of the main shaft section 31 along the radial direction of the crankshaft 3, so that the axis of the eccentric section 32 is parallel to the axis of the main shaft section 31, and the axis of the eccentric section 32 is separated from the axis of the main shaft section 31 by a certain distance. In this way, when the crankshaft 3 rotates, the eccentric section 32 can rotate eccentrically relative to the main shaft section 31, so that the eccentric section 32 can drive the piston 2 to rotate eccentrically in the compression chamber 11, that is, the piston 2 can perform continuous eccentric rolling motion along the inner wall of the compression chamber 11.

[0053] Meanwhile, the main shaft section 31 and the auxiliary shaft section 33 are coaxially arranged, that is, the axis of the main shaft section 31 coincides with the axis of the auxiliary shaft section 33. The axis of the eccentric section 32 can be set to be offset from the axis of the auxiliary shaft section 33 along the radial direction of the crankshaft 3, that is, the axis of the eccentric section 32 can be set to be parallel to the axis of the auxiliary shaft section 33, that is, the axis of the eccentric section 32 and the axis of the auxiliary shaft section 33 can be separated by a distance. In this way, when the crankshaft 3 rotates, the eccentric section 32 can rotate eccentrically relative to the auxiliary shaft section 33, and then the eccentric section 32 can drive the piston 2 to rotate eccentrically in the compression chamber 11, that is, the piston 2 can perform continuous eccentric rolling motion along the inner wall of the compression chamber 11.

[0054] In some embodiments, the motor 4 includes a stator 41 and a rotor 42, the rotor 42 being located inside the stator 41 and sleeved outside at least a portion of the crankshaft 3 at the end away from the piston 2, so as to selectively drive the piston 2 to rotate.

[0055] Specifically, the motor 4 is used to provide power for the rotation of the piston 2 through the crankshaft 3. The motor 4 includes a stator 41 and a rotor 42. The stator 41 generates a rotating magnetic field when energized, so that the rotor 42 can rotate under the action of the rotating magnetic field. The rotor 42 is set inside the stator 41, so that the rotor 42 and the stator 41 are coaxially arranged, and the rotor 42 can be located on the radial inner side of the stator 41. That is, the motor 4 can be an internal rotor motor. The internal rotor motor has high control precision, lower operating noise, and a compact structure, occupying less space, which is conducive to the installation on different equipment. The rotor 42 is sleeved on at least a part of the crankshaft 3 away from the piston 2, so that the rotor 42 can be powered by the crankshaft 3. Thus, when the rotor 42 rotates under the action of the rotating magnetic field generated by the stator 41, it can drive the crankshaft 3 to rotate together. That is, the crankshaft 3 can obtain the power of the motor 4 to transmit the power of the motor 4 to the piston 2, so as to realize the rotation of the piston 2 in the compression chamber 11.

[0056] Furthermore, the piston 2 and the rotor 42 can be spaced apart, allowing the piston 2 and the rotor 42 to be connected to different positions on the crankshaft 3 respectively, in order to avoid interference and ensure their respective connection reliability and operational reliability.

[0057] It should be noted that the motor 4 drives the crankshaft 3 to drive the piston 2 to make eccentric movements in the cylinder 1, so that the volume of the compression chamber 11 changes periodically, so as to continuously draw in, compress and exhaust air, and the motor 4 can be a permanent magnet motor, etc.

[0058] In some embodiments, the rotary compressor 100 further includes a compressor housing 5, in which the cylinder 1, the motor 4, and the crankshaft 3 are all mounted.

[0059] Specifically, the rotary compressor 100 also includes a compressor housing 5. The compressor housing 5 is the external housing structure of the rotary compressor 100, which provides space for the installation and maintenance of other components inside the rotary compressor 100 and protects them. The cylinder 1, motor 4, and crankshaft 3 are all installed inside the compressor housing 5, so that the compressor housing 5 can provide space for the installation and maintenance of the cylinder 1, motor 4, and crankshaft 3, ensuring reliable installation of the cylinder 1, motor 4, and crankshaft 3, thereby ensuring reliable operation of the cylinder 1, motor 4, and crankshaft 3. Moreover, the compressor housing 5 can protect the cylinder 1, motor 4, and crankshaft 3 from the outside, so as to avoid damage or failure caused by collisions between any of the cylinder 1, motor 4, and crankshaft 3 and external parts, which helps to extend the service life of the cylinder 1, motor 4, and crankshaft 3, and thus extend the service life of the rotary compressor 100.

[0060] It should be noted that the working fluid of the rotary compressor 100 of the present invention can be propane or the like.

[0061] The present invention also proposes a heat pump system.

[0062] The heat pump system according to embodiments of the present invention includes a rotary compressor 100 of any of the above embodiments. That is, the rotary compressor 100 can serve as the core power component of the heat pump system, used to drive the crankshaft 3 via the motor 4 to drive the piston 2 to rotate eccentrically within the compression chamber 11 to compress the refrigerant. The rotary compressor 100 has the characteristics of simple structure, small size, and low cost, making it the mainstream choice for small and medium-sized heat pump systems. Furthermore, it enables the rotary compressor 100 to achieve a first performance value... Second performance value And make Between 86 and 103 The height-to-diameter ratio of cylinder 1 is between 26 and 31, which can prevent the height-to-diameter ratio of cylinder 1 from being too small or too large, prevent the effective matching length between crankshaft 3 and piston 2 from being too small or too large, prevent the number of cylinders 1 from being too large, and prevent the shaft diameter of main shaft section 31 and secondary shaft section 33 from being too small or too large. This can prevent the increase of frictional power consumption and help improve the overall mechanical efficiency and energy efficiency of rotary compressor 100 and heat pump system.

[0063] The present invention also proposes an air conditioner.

[0064] The air conditioner according to embodiments of the present invention includes a rotary compressor 100 of any of the above embodiments. That is, the rotary compressor 100 can serve as the core power component of the air conditioner, used to drive the crankshaft 3 via the motor 4 to drive the piston 2 to rotate eccentrically within the compression chamber 11 to compress the refrigerant. The rotary compressor 100 has the characteristics of simple structure, small size, and low cost, making it suitable for installation in space-constrained indoor units such as wall-mounted and floor-standing units. Furthermore, it allows the rotary compressor 100 to achieve a first performance value... Second performance value And make Between 86 and 103 The height-to-diameter ratio of cylinder 1 is between 26 and 31, which can prevent the height-to-diameter ratio of cylinder 1 from being too small or too large, prevent the effective matching length between crankshaft 3 and piston 2 from being too small or too large, prevent the number of cylinders 1 from being too large, and prevent the shaft diameter of main shaft section 31 and secondary shaft section 33 from being too small or too large. This can prevent the increase of frictional power consumption and help improve the overall mechanical efficiency and energy efficiency of rotary compressor 100 and heat pump system.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotary compressor, characterized in that, include: Cylinder (1), wherein a compression chamber (11) is formed inside the cylinder (1); Piston (2), which is rotatably mounted in the compression chamber (11); A crankshaft (3), at least a portion of which extends into the compression chamber (11) and is fixed to the piston (2); Wherein, the diameter of the compression cavity (11) is And the height along the axial direction is The effective mating length between the crankshaft (3) and the piston (2) is The first performance value of the rotary compressor is And satisfy: 86< <103.

2. The rotary compressor according to claim 1, characterized in that, The crankshaft (3) includes a main shaft section (31) and an eccentric section (32) connected in sequence along the axial direction. The main shaft section (31) is adapted to be powered by a motor (4). The eccentric section (32) passes through the interior of the piston (2) to drive the piston (2) to move eccentrically.

3. The rotary compressor according to claim 2, characterized in that, The crankshaft (3) further includes a secondary shaft section (33), which is connected to the side of the eccentric section (32) away from the main shaft section (31), and the secondary shaft section (33) is adapted to be inserted into a bearing.

4. The rotary compressor according to claim 3, characterized in that, The number of cylinders (1) is And satisfy: =1 or =2.

5. The rotary compressor according to claim 4, characterized in that, The shaft diameter of the main shaft section (31) is The shaft diameter of the secondary shaft section (33) is The second performance value of the rotary compressor is And satisfy: ,26< <31.

6. The rotary compressor according to claim 3, characterized in that... The axis of the eccentric segment (32) is offset from the axis of the main shaft segment (31) along the radial direction of the crankshaft (3); And / or, the axis of the eccentric segment (32) is offset from the axis of the secondary shaft segment (33) along the radial direction of the crankshaft (3).

7. The rotary compressor according to claim 2, characterized in that, The motor (4) includes a stator (41) and a rotor (42), the rotor (42) being located inside the stator (41) and sleeved on at least a portion of the crankshaft (3) away from the piston (2) to selectively drive the piston (2) to rotate.

8. The rotary compressor according to claim 2, characterized in that, It also includes a compressor housing (5), in which the cylinder (1), the motor (4) and the crankshaft (3) are all installed.

9. A heat pump system, characterized in that, The rotary compressor included in any one of claims 1-8.

10. An air conditioner, characterized in that, The rotary compressor included in any one of claims 1-8.

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