Compressor shaft system oil return structure and compressor

Abstract

The compressor shaft system oil return structure comprises a crankshaft, an upper support, a lower support and a bottom oil pool, the crankshaft is provided with a crankshaft oil return channel, the crankshaft oil return channel comprises an oil return channel, an oil return outlet and an oil return inlet, the oil return outlet is communicated with the top of the oil return channel, the oil return inlet is communicated with the bottom of the oil return channel, and the oil return inlet is communicated with the bottom of the oil return channel. The upper end of the crankshaft is inserted into the upper support, the oil return inlet is formed in the upper support, the oil return outlet is formed in the lower support, the bottom oil pool is located below the lower support, and a gap is formed between the inner side wall of the bottom oil pool and the outer surface of the lower support. By implementing the structure, the performance of the scroll compressor lubricating system can be improved, the installation and maintenance process is simplified, and the reliability and efficiency of the system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a compressor shaft oil return structure and a compressor. Background Art

[0002] A scroll compressor is a device that uses a volumetric compression mechanism. Its core component is a scroll pair consisting of an orbiting scroll and a stationary scroll. During the compression process, the orbiting scroll orbits relative to the stationary scroll, thereby forming a series of gradually decreasing closed volumes. The continuous change of these closed volumes enables the intake, compression and discharge of gas, ultimately achieving the purpose of compressing the gas. In order to ensure effective sealing between the orbiting scroll and the stationary scroll, the contact surfaces of the two are sealed by a sliding friction pair. Appropriate lubricating oil needs to be provided at the sliding friction pair to reduce wear and improve efficiency.

[0003] The design of existing scroll compressor lubrication system is as follows Figure 1 As shown in the figure, its core components include a movable scroll, a fixed scroll, an upper bracket, an oil return pipe, a crankshaft, a motor, a lower bracket, an oil pump, an oil return pipe fixing bracket, and fixing screws of the fixing bracket. This structure requires an oil hole to be set on the upper bracket to connect with the oil return pipe. This compressor adopts a high-pressure chamber design, which means that the gas discharged from the compressor directly enters the internal cavity, so that the entire compressor is maintained in a high-pressure environment. High-pressure refrigeration oil is stored at the bottom of the compressor. When the motor starts and drives the crankshaft to rotate, the oil pump at the bottom of the crankshaft also rotates, and the refrigeration oil is transported to the oil pool in the upper bracket through the oil channel inside the crankshaft. The refrigeration oil in the oil pool performs two important functions: one is to provide necessary lubrication for the inside of the pump body through the opening at the top of the oil pool; the other is to guide the excess oil back to the oil pool at the bottom of the compressor through the return oil pipe for recycling. The installation of the oil return pipe is a delicate job. It not only requires a tight interference fit with the upper bracket, but also requires the use of special tooling to assist in the press-in process. In addition, during the assembly of the whole machine, the circumferential position of the oil return pipe must be strictly controlled to avoid interference with other components. Finally, the oil return pipe needs to be safely installed on the lower bracket through a fixed bracket to ensure its stability and reliability. The specific workflow is as follows: the oil pump pumps high-pressure lubricating oil from the oil pool at the bottom of the compressor into the upper end of the crankshaft and into the oil pool of the upper bracket. The notch in the upper part of the oil pool allows part of the lubricating oil to flow into the pump body to lubricate the bottom surface of the movable scroll and the cross slip ring. Excess oil flows back to the oil pool at the bottom of the compressor through the oil return pipe. The oil return pipe is installed on the upper bracket, passes through the motor, and is fixed to the lower bracket through a fixed bracket.

[0004] Although the existing lubrication system can meet basic lubrication needs, it has certain limitations in installation and assembly: the return oil pipe needs to pass through the motor and be fixed to the lower bracket through a fixing bracket, which increases the complexity and difficulty of installation. The complex return oil pipeline takes up more space, affecting the overall layout and compactness of the compressor. After long-term operation, the fixing bracket may loosen, causing the return oil pipe to shift in position, affecting the lubrication effect.

[0005] Therefore, it is necessary to design a new structure to improve the performance of the scroll compressor lubrication system, simplify the installation and maintenance process, and improve the reliability and efficiency of the system. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a compressor shaft oil return structure and a compressor.

[0007] To solve the above technical problems, the objective of the present invention is achieved through the following technical solutions: providing a compressor shaft oil return structure, comprising: a crankshaft, an upper bracket, a lower bracket and a bottom oil pool, the crankshaft is provided with a crankshaft oil return channel, the crankshaft oil return channel comprises an oil return channel, an oil return outlet and an oil return inlet, the oil return outlet is connected to the top of the oil return channel, the oil return inlet is connected to the bottom of the oil return channel, the upper end of the crankshaft is inserted in the upper bracket, the oil return inlet is placed in the upper bracket, the oil return outlet is located on the lower bracket, the bottom oil pool is located below the lower bracket, and a gap is provided between the inner side wall of the bottom oil pool and the outer surface of the lower bracket.

[0008] A further technical solution is as follows: the oil return inlet is located above the oil return outlet.

[0009] A further technical solution is: it also includes a movable scroll plate, wherein the movable scroll plate is connected to the upper part of the upper bracket and the lower end of the crankshaft is inserted into the lower bracket.

[0010] Its further technical solution is: it also includes an oil pump; the crankshaft is also provided with a crankshaft oil channel, the lower part of the crankshaft is connected to a mounting groove, the oil pump is inserted in the mounting groove, and the crankshaft oil channel is connected to the mounting groove.

[0011] A further technical solution is as follows: the crankshaft is also provided with an upper bearing lubricating oil outlet hole and a lower bearing lubricating oil outlet hole, and the upper bearing lubricating oil outlet hole and the lower bearing lubricating oil outlet hole are respectively connected to the oil channel on the crankshaft.

[0012] A further technical solution is as follows: the lubrication oil outlet hole of the lower bearing is arranged in the lower bracket.

[0013] A further technical solution is as follows: the lubrication oil outlet hole of the upper bearing is arranged in the upper bracket.

[0014] A further technical solution is: it also includes a fixed scroll and a motor, the fixed scroll is connected above the movable scroll, and the motor is located on the outside of the crankshaft.

[0015] A further technical solution is as follows: a mounting hole is provided in the upper bracket, the upper end of the crankshaft is inserted into the mounting hole, and the diameter of the crankshaft is smaller than the diameter of the mounting hole.

[0016] In addition, in order to overcome the defects of the prior art, the present invention also provides a compressor, including the above-mentioned compressor shaft oil return structure.

[0017] The beneficial effects of the present invention compared with the prior art are as follows: the present invention arranges a crankshaft, an upper bracket, a lower bracket and a bottom oil pool, and an oil return channel is arranged from top to bottom inside the crankshaft, the oil return inlet is located in the upper bracket, and the oil return outlet is located on the lower bracket. The lubricating oil enters the crankshaft oil return channel from the oil return inlet in the upper bracket, flows downward by gravity, and is finally discharged from the oil return outlet to the bottom oil pool. A gap is arranged between the bottom oil pool and the lower bracket to ensure smooth return of the lubricating oil; the performance of the scroll compressor lubrication system is improved, the installation and maintenance process is simplified, and the reliability and efficiency of the system are improved.

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the cross-section structure of a scroll compressor lubrication system in the prior art;

[0021] Figure 2 A schematic cross-sectional view of a compressor shaft oil return structure provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the three-dimensional structure of a crankshaft provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the cross-sectional structure of a crankshaft provided in an embodiment of the present invention;

[0024] Description of the symbols in the figure:

[0025] 1. Stationary scroll; 2. Orbital scroll; 3. Oil return pipe; 4. Upper bracket; 5. Motor; 6. Lower bracket; 7. Oil pump; 8. Crankshaft; 81. Oil channel on crankshaft; 82. Oil return channel; 83. Oil return inlet; 84. Oil return outlet; 85. Upper bearing lubrication oil outlet hole; 86. Lower bearing lubrication oil outlet hole; 9. Oil return pipe fixing bracket; 10. Fixing bracket fixing screws; F. Top oil pool; 11. Bottom oil pool. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0028] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0029] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] The existing scroll compressor lubrication system includes core components such as the movable and stationary scroll 1, the oil pump 7, the oil return pipe 3, and the upper bracket 4, which are designed to lubricate and circulate with high-pressure refrigeration oil. The motor 5 drives the crankshaft 8 to rotate, and the oil pump 7 transports the refrigeration oil from the bottom oil pool 11 to the oil pool of the upper bracket 4, provides lubrication, and guides the excess oil back to the bottom oil pool 11 through the oil return pipe 3. The installation of the oil return pipe 3 requires a precise interference fit, and it passes through the motor 5 and is fixed on the lower bracket 6 to ensure stability. The workflow of the system includes lubricating the movable scroll 2 and the cross slip ring. Although the system meets basic requirements, the installation of the oil return pipe 3 is relatively complex, occupies space, and may cause the position of the oil return pipe 3 to shift after long-term operation.

[0031] To this end, an embodiment of the present invention provides a compressor shaft oil return structure to improve the performance of the scroll compressor lubrication system, simplify the installation and maintenance process, and improve the reliability and efficiency of the system.

[0032] Specifically, the compressor shaft system oil return structure realizes the effective recovery of excess lubricating oil in the upper bracket 4 by optimizing the oil return path, thereby improving the efficiency and reliability of the lubrication system. The design of placing the oil return inlet 83 above the oil return outlet 84 helps to promote the smooth flow of oil by gravity and reduce system resistance. The design of the built-in oil pump 7 and the oil channel 81 on the crankshaft ensures that key components such as upper and lower bearings are fully lubricated, while simplifying the external oil circuit and enhancing the compactness of the overall layout. The configuration of the movable scroll 2 and the fixed scroll 1 and the external design of the motor 5 further improve the working efficiency and stability of the compressor. In addition, the reasonable gap design between the upper bracket 4 and the crankshaft 8 is not only easy to install, but also reduces wear and prolongs the service life of the equipment. Through this series of design improvements, the oil return structure significantly reduces the difficulty of maintenance and improves the overall performance of the system. In summary, these innovative points work together to greatly improve the efficiency of the scroll compressor lubrication system, simplify the installation and maintenance process, and ensure higher working reliability and efficiency.

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] See also Figures 2 to 4 The above-mentioned compressor shaft oil return structure includes: a crankshaft 8, an upper bracket 4, a lower bracket 6 and a bottom oil pool 11. The crankshaft 8 is provided with a crankshaft oil return channel, and the crankshaft oil return channel includes an oil return channel 82, an oil return outlet 84 and an oil return inlet 83. The oil return outlet 84 is communicated with the top of the oil return channel 82, and the oil return inlet 83 is communicated with the bottom of the oil return channel 82. The upper end of the crankshaft 8 is inserted in the upper bracket 4, the oil return inlet 83 is placed in the upper bracket 4, the oil return outlet 84 is located on the lower bracket 6, and the bottom oil pool 11 is located below the lower bracket 6, and a gap is provided between the inner side wall of the bottom oil pool 11 and the outer surface of the lower bracket 6.

[0035] When the compressor is running, the lubricating oil generated by the mechanical movement will accumulate inside the upper bracket 4. The lubricating oil accumulated in the upper bracket 4 is sucked into the crankshaft oil return channel through the oil return inlet 83 provided in the upper bracket 4. The lubricating oil entering the oil return channel 82 flows downward along the channel and finally reaches the bottom of the oil return channel 82. The lubricating oil is then discharged from the oil return outlet 84 at the bottom of the oil return channel 82 and flows to a specific position located on the lower bracket 6. The lubricating oil discharged from the oil return outlet 84 flows smoothly back to the bottom oil pool 11 through the gap between the lower bracket 6 and the bottom oil pool 11, completing a complete oil return cycle.

[0036] Through the effective oil return design, it is ensured that the lubricating oil can be returned to the oil pool in time, avoiding the waste of lubricating oil, and at the same time ensuring that all moving parts are always in a good lubrication state. Reasonable oil circulation can effectively reduce dry friction between components, reduce the degree of wear, and extend the service life of the equipment. This design does not require additional external pipelines to guide the oil return, making the entire compressor structure more compact and reducing space occupancy. Since the oil return structure design is simple and clear, it is not only convenient for daily inspection and maintenance, but also reduces the failure rate caused by complex structures. By ensuring the stable supply and circulation of lubricating oil, the stability of compressor operation is improved, and performance degradation or failure caused by insufficient lubrication is avoided. The efficient oil circulation mechanism helps to reduce unnecessary energy loss, improve the overall energy efficiency of the compressor, and meet the requirements of energy conservation and emission reduction.

[0037] In one embodiment, see Figure 3 The above-mentioned oil return inlet 83 is located above the oil return outlet 84.

[0038] The oil return inlet 83 is arranged at the upper end of the crankshaft 8 and located inside the upper bracket 4, ensuring that the lubricating oil can be collected from the inside of the upper bracket 4. The oil return outlet 84 is arranged at the lower end of the crankshaft 8 and located on the lower bracket 6, so that the lubricating oil can be directly discharged to the bottom oil pool 11.

[0039] Since the oil return inlet 83 is located above the oil return outlet 84, the lubricating oil can flow downward naturally by gravity, and no additional power device is required to assist the oil flow, thereby simplifying the system design and reducing energy consumption. This up-and-down arrangement effectively prevents the oil from flowing in reverse, ensuring that the oil can only flow in one direction from top to bottom, thereby enhancing the reliability and stability of the system.

[0040] After the oil flows in from the oil return inlet 83, it naturally flows downward along the oil return channel 82 inside the crankshaft 8 until it is discharged through the oil return outlet 84. Such a flow path design is conducive to uniform distribution of the oil and improves the lubrication effect. The oil always flows in one direction from top to bottom, reducing the risk of oil contamination during the flow process, maintaining the cleanliness of the oil, and helping to extend the service life of the equipment. The clear oil flow direction and simple structural design make it easier for maintenance personnel to understand and operate, reducing the difficulty and cost of maintenance.

[0041] In one embodiment, see Figure 2 The above-mentioned compressor shaft oil return structure also includes a movable scroll plate 2, which is connected to the upper end of the crankshaft 8 above the upper bracket 4 and is inserted into the lower bracket 6.

[0042] The movable scroll 2 is located above the upper bracket 4 and is tightly connected to the upper bracket 4, together forming one of the core moving parts of the compressor. The upper end of the crankshaft 8 is fixed in the upper bracket 4 through a bearing, and its lower end passes through the upper bracket 4 and extends into the lower bracket 6, forming a stable support structure.

[0043] The movable scroll 2 works with the fixed scroll 1 to achieve effective compression of the refrigerant gas. The precise position of the movable scroll 2 helps to ensure the sealing and stability during the compression process and improve the compression efficiency. The two ends of the crankshaft 8 are respectively fixed in the upper bracket 4 and the lower bracket 6, forming a stable support system, which effectively reduces the vibration and noise during operation and improves the overall stability and service life of the compressor. The crankshaft 8 is designed with an oil return channel 82. The lubricating oil enters the crankshaft 8 through the oil return inlet 83, and then flows along the channel in the crankshaft 8 to the oil return outlet 84, and finally discharges into the oil pool. This layout between the movable scroll 2 and the crankshaft 8 helps the lubricating oil to better lubricate the various moving parts, while ensuring smooth oil return. The combined design of the movable scroll 2, the upper bracket 4, the crankshaft 8 and the lower bracket 6 makes the entire compressor shaft system structure more compact, saves space, and is suitable for various miniaturization and lightweight requirements. The connection method between the movable scroll 2 and the upper bracket 4, the crankshaft 8 and the lower bracket 6 is simple and clear, easy to assemble and disassemble, and reduces production and maintenance costs.

[0044] In one embodiment, see Figure 2 The above-mentioned compressor shaft oil return structure also includes an oil pump 7; a crankshaft oil channel 81 is also provided in the crankshaft 8, the lower part of the crankshaft 8 is connected to the mounting groove, the oil pump 7 is inserted in the mounting groove, and the crankshaft oil channel 81 is connected to the mounting groove.

[0045] The oil pump 7 is inserted into the mounting groove below the crankshaft 8, and the mounting groove is connected to the lower end of the crankshaft 8 to ensure that the oil pump 7 can be stably installed on the crankshaft 8. A special oiling channel is provided inside the crankshaft 8, which extends from the bottom to the top of the crankshaft 8 and is connected to the mounting groove. The oil pump 7 is responsible for extracting the lubricating oil from the oil pool and delivering it to various parts that need lubrication through the crankshaft oiling channel 81. Since the oil pump 7 is directly installed below the crankshaft 8, a continuous supply of lubricating oil can be ensured, and a good lubrication effect can be maintained even at high speeds.

[0046] The continuous lubrication provided by the oil pump 7 can significantly reduce the friction between the crankshaft 8 and other moving parts, extending the service life of the compressor. The lubricating oil can also take away the heat generated by the moving parts, help cool the compressor, and further improve its operating stability.

[0047] The oiling channel inside the crankshaft 8 is reasonably designed to ensure that the lubricating oil can be evenly distributed to each part that needs lubrication, avoiding local overheating or insufficient lubrication. The connecting design between the mounting groove and the oiling channel 81 on the crankshaft allows the lubricating oil extracted by the oil pump 7 to directly enter the crankshaft 8, simplifying the oil circuit system and improving the reliability of the system.

[0048] The oil pump 7 is directly mounted below the crankshaft 8 and communicated with the oil channel 81 on the crankshaft, making the entire lubrication system more compact and saving space. The mounting groove design of the oil pump 7 makes the installation and removal of the oil pump 7 very convenient, and is easy to maintain and replace.

[0049] Since the oil pump 7 is directly mounted on the crankshaft 8, the number of external pipes and joints is reduced, the risk of leakage is reduced, and the overall reliability of the system is improved. The working status of the oil pump 7 can be monitored in real time by sensors, and potential problems can be discovered and handled in time to ensure the normal operation of the compressor.

[0050] In one embodiment, see Figure 2 and Figure 3 The crankshaft 8 is also provided with an upper bearing lubricating oil outlet hole 85 and a lower bearing lubricating oil outlet hole 86, and the upper bearing lubricating oil outlet hole 85 and the lower bearing lubricating oil outlet hole 86 are respectively connected to the crankshaft upper oil channel 81.

[0051] In one embodiment, see Figure 2 , the lower bearing lubrication oil outlet hole 86 is placed in the lower bracket 6. This hole is also connected to the crankshaft oil channel 81 for delivering lubricating oil to the lower bearing. This design ensures that the lubricating oil can flow directly into the lower bearing to provide effective lubrication.

[0052] In one embodiment, see Figure 2 The upper bearing lubrication oil outlet hole 85 is placed in the upper bracket 4. The hole is connected to the crankshaft oil channel 81 for delivering lubricating oil to the upper bearing. Such a design can ensure that the lubricating oil can flow directly into the upper bearing to provide effective lubrication.

[0053] By providing multiple lubricating oil outlet holes on the crankshaft 8, it is possible to ensure that the lubricating oil is evenly distributed in various parts that need lubrication, especially the upper bearing and the lower bearing. The oil pump 7 delivers the lubricating oil to each oil outlet hole through the oil channel 81 on the crankshaft, ensuring a continuous supply of lubricating oil and maintaining a good lubrication effect even at high speed operation.

[0054] The multi-point lubrication design can significantly reduce the friction between the crankshaft 8 and other moving parts, extending the service life of the compressor. The lubricating oil not only provides lubrication, but also takes away the heat generated by the moving parts, helping to cool the compressor and further improving its operating stability.

[0055] The upper bearing lubrication oil outlet hole 85 and the lower bearing lubrication oil outlet hole 86 are respectively placed in the upper bracket 4 and the lower bracket 6 to ensure that the lubricating oil can directly reach the target position and avoid unnecessary oil circuit loss. All lubrication oil outlet holes are connected to the crankshaft oil channel 81, making the oil circuit system more concise and efficient, and improving the reliability of the system.

[0056] Multiple lubrication outlet holes are integrated on the crankshaft 8 and communicated with the crankshaft oil channel 81, making the entire lubrication system more compact and saving space. The design of the lubrication outlet holes makes the installation and removal of the oil pump 7 very convenient, and is easy to maintain and replace.

[0057] In one embodiment, see Figure 2 The above-mentioned compressor shaft oil return structure also includes a fixed scroll 1 and a motor 5. The fixed scroll 1 is connected above the movable scroll 2, and the motor 5 is located on the outside of the crankshaft 8. The fixed scroll 1 and the movable scroll 2 together constitute the compression chamber of the compressor, which is used to realize the gas compression process. The motor 5 is located on the outside of the crankshaft 8 and is used to drive the crankshaft 8 to rotate. The rotation of the crankshaft 8 drives the movable scroll 2 to move, thereby realizing the suction, compression and discharge of the gas. Specifically, when the motor 5 drives the crankshaft 8 to rotate, the movable scroll 2 makes an eccentric motion relative to the fixed scroll 1 to realize the compression of the gas.

[0058] The precise coordination of the fixed scroll 1 and the orbiting scroll 2 ensures the high efficiency and stability of the compression process. The eccentric movement of the orbiting scroll 2 gradually compresses the gas in the compression chamber and finally discharges it from the exhaust port. Good sealing reduces gas leakage, improves compression efficiency and reduces energy consumption.

[0059] The crankshaft 8 is a key component connecting the motor 5 and the movable scroll 2. Its design and manufacturing accuracy are crucial to the performance of the compressor. The crankshaft 8 is provided with multiple lubrication holes to ensure effective lubrication of each moving part. The efficient operation and stable output of the motor 5 ensure the smooth rotation of the crankshaft 8, thereby ensuring the precise movement of the movable scroll 2.

[0060] The motor 5 is located outside the crankshaft 8, making the entire compressor structure more compact and saving space. This layout is also conducive to the heat dissipation and maintenance of the motor 5. The separate design of the motor 5 and the crankshaft 8 allows each component to be installed and replaced independently, improving the maintainability of the compressor.

[0061] In one embodiment, see Figure 2 A mounting hole is provided in the upper bracket 4, and the upper end of the crankshaft 8 is inserted into the mounting hole. The diameter of the crankshaft 8 is smaller than the diameter of the mounting hole. A top oil pool F can be formed between the mounting hole and the upper end of the crankshaft 8. The oil return inlet 83 is located in the top oil pool F, and the excess liquid in the top oil pool F is returned to the bottom oil pool 11.

[0062] In this embodiment, the formation of the top oil pool ensures that the crankshaft 8 and its related parts can be fully lubricated when rotating at high speed. The lubricating oil is evenly distributed to various parts that need lubrication through centrifugal force. The design of the oil return inlet 83 allows the excess lubricating oil in the top oil pool to flow back to the bottom oil pool 11 in time, avoiding the waste of lubricating oil and also preventing the problem caused by excessive oil in the top oil pool.

[0063] Sufficient lubrication reduces the friction between the crankshaft 8 and other components, reduces wear, and improves the durability and reliability of the system. The lubricating oil can also help dissipate heat during the circulation process, reduce the temperature of the crankshaft 8 and other components, and further improve the thermal stability of the system.

[0064] The efficient oil return design ensures the recycling of lubricating oil, maintains the stable operation of the system, and reduces unnecessary downtime and maintenance. By setting the mounting hole and the top oil pool in the upper bracket 4, the entire compressor structure is more compact, saving space and facilitating miniaturization. The separation design of the upper bracket 4 and the crankshaft 8 allows each component to be installed and replaced independently, improving the maintainability of the compressor.

[0065] The workflow of the above structure is as follows:

[0066] When the compressor is started, the motor 5 starts to work and drives the crankshaft 8 to rotate. The rotation of the crankshaft 8 drives the movable scroll 2 to make eccentric movement relative to the fixed scroll 1, so as to realize the suction, compression and discharge of gas. During the rotation of the crankshaft 8, the oil pump 7 pumps the lubricating oil from the bottom oil pool 11, and after being sucked from the crankshaft oil channel 81, it is output from the upper bearing lubricating oil outlet hole 85 and the lower bearing lubricating oil outlet hole 86 respectively, lubricating the bearings in the upper bracket 4 and the lower bracket 6, and the lubricating oil retained in the upper bracket 4 is accumulated in the gap between the crankshaft 8 and the upper bracket 4 and in the contact surface between the movable scroll 2 and the upper bracket 4. The accumulated lubricating oil is sucked into the crankshaft oil return channel through the oil return inlet 83 provided in the upper bracket 4. The oil return inlet 83 is located at the upper end of the crankshaft 8 and is located inside the upper bracket 4, so as to ensure that the lubricating oil can be collected from the inside of the upper bracket 4. The lubricating oil entering the oil return channel 82 flows downward along the channel and finally reaches the bottom of the oil return channel 82. Since the oil return inlet 83 is located above the oil return outlet 84, the lubricating oil can flow downward naturally by gravity, and no additional power device is required to assist the oil flow. The lubricating oil is then discharged from the oil return outlet 84 at the bottom of the oil return channel 82. The lubricating oil discharged from the oil return outlet 84 flows smoothly back to the bottom oil pool 11 through the gap between the lower bracket 6 and the bottom oil pool 11, completing a complete oil return cycle. The lubricating oil returned to the bottom oil pool 11 can be pumped out again by the oil pump 7 and delivered to the various components that need lubrication through the oil channel 81 on the crankshaft to ensure a continuous supply of lubricating oil.

[0067] The structure eliminates the oil return pipe 3, the oil return pipe fixing frame 9 and the fixing screw 10 of the fixing frame, reduces the number of parts and simplifies the structural design. The oil hole processing of the upper bracket 4 and the installation process of the upper bracket 4 are also eliminated, which reduces the production cost and improves the assembly efficiency. Through the oil return channel 82 and multiple lubricating oil outlet holes inside the crankshaft 8, it is ensured that the lubricating oil is evenly distributed in various parts that need lubrication, especially the upper bearing and the lower bearing. Adequate lubrication reduces the friction between the crankshaft 8 and other components, reduces wear, and improves the durability and reliability of the system. The lubricating oil can help dissipate heat during the circulation process, reduce the temperature of the crankshaft 8 and other components, and further improve the thermal stability of the system. This helps to extend the service life of the compressor. The entire oil return structure is compactly designed, saves space, and is conducive to miniaturization design. The oil return channel 82 and multiple lubricating oil outlet holes inside the crankshaft 8 make the oil circuit system more concise and efficient, and improve the reliability of the system. The oil return structure design is simple and clear, which is convenient for daily inspection and maintenance. The oil pump 7 is directly installed under the crankshaft 8 and communicates with the oil channel 81 on the crankshaft, making the installation and disassembly of the oil pump 7 very convenient, reducing the difficulty and cost of maintenance. Reasonable oil circulation can effectively reduce dry friction between components, reduce the degree of wear, and extend the service life of the equipment. The clear oil flow direction and simple structural design make it easier for maintenance personnel to understand and operate, and reduce the failure rate caused by complex structures. The efficient oil circulation mechanism helps to reduce unnecessary energy loss, improve the overall energy efficiency of the compressor, and meet the requirements of energy conservation and emission reduction. By ensuring the stable supply and circulation of lubricating oil, the stability of the compressor operation is improved, and performance degradation or failure caused by insufficient lubrication is avoided. The two ends of the crankshaft 8 are respectively fixed in the upper bracket 4 and the lower bracket 6, forming a stable support system, which effectively reduces vibration and noise during operation and improves the overall stability and service life of the compressor.

[0068] In summary, this structure eliminates three parts, namely, the oil return pipe 3, the oil return pipe fixing bracket 9, and the fixing bracket fixing screw 10. It does not need to process the oil hole of the upper bracket 4, and also reduces the installation process of the upper bracket 4, reduces the production cost, and improves the assembly efficiency. This compressor shaft system oil return structure not only simplifies the design and reduces the production cost, but also improves the reliability and efficiency of the system, which is an important improvement in the compressor design.

[0069] In this embodiment, the above-mentioned crankshaft oil channel 81 runs through the entire crankshaft 8, while the return oil channel 82 does not run through the entire crankshaft 8. Its top is connected to the return oil inlet 83, and the lubricating oil is introduced from the side, and its bottom is connected to the return oil outlet 84, and the lubricating oil flows in from the side.

[0070] The positions of the return oil inlet 83 and the return oil outlet 84 are rationally arranged to ensure smooth return of the lubricating oil, reduce flow resistance, and improve lubrication efficiency; the upper end of the crankshaft 8 is inserted into the upper bracket 4, the return oil inlet 83 is located in the upper bracket 4, and the return oil outlet 84 is located on the lower bracket 6, which simplifies the matching mode between the bracket and the crankshaft 8 and facilitates quick installation; a gap is provided between the bottom oil pool 11 and the lower bracket 6 to ensure that the lubricating oil in the oil pool can quickly return and improve the oil recovery efficiency; the matching between the return oil channel 82 and the bracket is optimized to reduce oil leakage, enhance the sealing of the system, and ensure continuous and reliable lubrication; the positions of the return oil channel 82 and the oil pump 7 are rationally designed to facilitate maintenance personnel to check, clean and replace the lubricating oil, thereby reducing maintenance costs and time.

[0071] The above-mentioned compressor shaft oil return structure is provided with a crankshaft 8, an upper bracket 4, a lower bracket 6 and a bottom oil pool 11. An oil return channel 82 is provided from top to bottom inside the crankshaft 8, an oil return inlet 83 is located in the upper bracket 4, and an oil return outlet 84 is located on the lower bracket 6. The lubricating oil enters the crankshaft oil return channel from the oil return inlet 83 in the upper bracket 4, flows downward by gravity, and is finally discharged from the oil return outlet 84 to the bottom oil pool 11. A gap is provided between the bottom oil pool 11 and the lower bracket 6 to ensure smooth return of the lubricating oil, thereby improving the performance of the scroll compressor lubrication system, simplifying the installation and maintenance process, and improving the reliability and efficiency of the system.

[0072] In one embodiment, a working method performed by the compressor shaft oil return structure is also provided, including:

[0073] The excess liquid in the upper bracket 4 is input into the oil return channel 82 through the oil return inlet 83 , passes through the oil return channel 82 , and is output from the oil return outlet 84 , and flows back to the bottom oil pool 11 from the gap.

[0074] It should be noted that technical personnel in the relevant field can clearly understand that the specific implementation process of the working method performed by the above-mentioned compressor shaft oil return structure can refer to the corresponding description in the above-mentioned compressor shaft oil return structure embodiment, and for the convenience and conciseness of the description, it will not be repeated here.

[0075] In one embodiment, a compressor is provided, including the above-mentioned compressor shaft oil return structure, so as to improve the performance of the scroll compressor lubrication system, simplify the installation and maintenance process, and improve the reliability and efficiency of the system.

[0076] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A compressor shaft oil return structure, characterized in that: include: A crankshaft, an upper bracket, a lower bracket and a bottom oil pool, wherein the crankshaft is provided with a crankshaft oil return channel, the crankshaft oil return channel includes an oil return channel, an oil return outlet and an oil return inlet, the oil return outlet is communicated with the top of the oil return channel, the oil return inlet is communicated with the bottom of the oil return channel, the upper end of the crankshaft is inserted in the upper bracket, the oil return inlet is placed in the upper bracket, the oil return outlet is located on the lower bracket, the bottom oil pool is located below the lower bracket, and a gap is provided between the inner side wall of the bottom oil pool and the outer surface of the lower bracket.

2. A compressor shaft oil return structure according to claim 1, characterized in that: The oil return inlet is located above the oil return outlet.

3. A compressor shaft oil return structure according to claim 2, characterized in that: It also includes a movable scroll plate, which is connected to the upper part of the upper bracket and the lower end of the crankshaft is inserted into the lower bracket.

4. A compressor shaft oil return structure according to claim 3, characterized in that: It also includes an oil pump; the crankshaft is also provided with a crankshaft oil channel, the lower part of the crankshaft is connected to a mounting groove, the oil pump is inserted in the mounting groove, and the crankshaft oil channel is connected to the mounting groove.

5. A compressor shaft oil return structure according to claim 4, characterized in that: The crankshaft is also provided with an upper bearing lubricating oil outlet hole and a lower bearing lubricating oil outlet hole, and the upper bearing lubricating oil outlet hole and the lower bearing lubricating oil outlet hole are respectively connected to the oil channel on the crankshaft.

6. A compressor shaft oil return structure according to claim 5, characterized in that: The lubrication oil outlet hole of the lower bearing is arranged in the lower bracket.

7. A compressor shaft oil return structure according to claim 5, characterized in that: The upper bearing lubrication oil outlet hole is arranged in the upper bracket.

8. The compressor shaft oil return structure according to claim 5, characterized in that: It also includes a fixed scroll and a motor. The fixed scroll is connected above the movable scroll, and the motor is located outside the crankshaft.

9. A compressor shaft oil return structure according to claim 8, characterized in that: The upper bracket is provided with a mounting hole, the upper end of the crankshaft is inserted into the mounting hole, and the diameter of the crankshaft is smaller than the diameter of the mounting hole.

10. A compressor, characterized in that: It comprises the compressor shaft oil return structure as described in any one of claims 1 to 9.

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