Self-lubricating crankshaft and refrigeration equipment

Abstract

The invention provides a self-lubricating crankshaft and refrigeration equipment, and relates to the field of refrigeration equipment, an annular concave main shaft oil storage groove is formed by main shaft part sections where oil storage section oil grooves are distributed, the oil storage space is increased, and the lead of the oil storage section oil grooves is smaller than that of other sections of spiral oil grooves, so that the speed of refrigerating machine oil is slower during backflow; the eccentric oil storage groove formed in the end face of the connecting rod shaft is communicated with the eccentric section oil groove through the oil outlet hole, the function of storing the refrigerating machine oil is achieved, and when restarting is conducted after shutdown, the stored refrigerating machine oil can be put into use rapidly and can be supplied to the eccentric part and the main shaft part in time to provide initial lubrication. Dry friction at the starting moment is reduced, the reliability of the crankshaft during starting is improved, and poor lubrication caused by insufficient oil supply is avoided.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment, and in particular to a self-lubricating crankshaft and refrigeration equipment. Background Art

[0002] At present, piston refrigerator compressors use a crank-connecting rod mechanism to drive the piston to perform linear reciprocating motion. At present, crankshaft wear and jamming account for a large proportion of compressor failures. However, in order to ensure the reliability of the crankshaft, it is inconvenient to reduce the friction work by reducing the diameter of the crankshaft, nor is it convenient to change the winding scheme of the motor. At present, the oiling and lubrication structure of the compressor generally adopts a centrifugal-spiral method. The oiling speed of this method is slow, and after shutdown, the refrigeration oil (lubricating oil) flows directly back to the lower shell under the action of gravity. When restarting again, the refrigeration oil will re-lubricate the various parts of the crankshaft through the oil circuit. It is only suitable for the long-term operation of the compressor. For some use scenarios with more precise temperature control, the compressor has repeated start-stop conditions. After the compressor stops, the refrigeration oil flows back to the lower shell under the action of gravity. When restarting again, the refrigeration oil needs to be re-absorbed, resulting in untimely lubrication and serious crankshaft wear.

[0003] A Chinese patent (publication number CN 117685197 A, publication date 20240312) discloses a crankshaft, a compressor and a refrigeration device, wherein the crankshaft comprises a main shaft and an eccentric portion, wherein the main shaft portion is provided with an axial concave cavity on an end face away from the eccentric portion, wherein an oil guide hole extending from the axial concave cavity toward the eccentric portion is provided inside the main shaft portion, and an oil pumping blade is provided at the end of the connecting shaft, wherein the oil pumping blade generates a vertical upward thrust on the refrigeration oil, thereby raising the liquid level of the refrigeration oil inside the crankshaft, thereby improving the oil pumping capacity of the crankshaft; the improvement is also made from the ability to pump the refrigeration oil again after the refrigeration oil flows back to the lower shell, and although the oil pumping speed of the refrigeration oil is accelerated, there is still a stage in which the lubrication condition of the crankshaft surface is poor; in addition, in the prior art, an annular groove is provided on the outer wall surface of the main shaft portion of the crankshaft to form a friction reducing section, thereby reducing the friction resistance and improving the performance of the compressor, but it is still difficult to obtain timely lubrication when restarting after shutdown, thereby affecting the reliability of the compressor. Summary of the invention

[0004] The purpose of the present invention is to provide a self-lubricating crankshaft and refrigeration equipment in view of the defects of the prior art. The main shaft segments distributed by the oil storage section oil tank form an annular depressed main shaft oil storage tank, which increases the oil storage space. The lead of the oil storage section oil tank is smaller than that of other sections of the spiral oil tank, so that the refrigeration oil returns more slowly and the residence time of the refrigeration oil on the crankshaft is prolonged. The eccentric oil storage tank arranged on the end face of the connecting rod shaft is connected to the eccentric section oil tank through the oil outlet hole, which also plays the role of storing refrigeration oil. When restarting after shutdown, the stored refrigeration oil can be quickly put into use and can be supplied to the eccentric part and the main shaft part in time to provide initial lubrication, thereby reducing dry friction at the moment of starting, improving the reliability of the crankshaft when starting, and avoiding poor lubrication due to insufficient oil supply.

[0005] The first object of the present invention is to provide a self-lubricating crankshaft, adopting the following scheme:

[0006] It includes an axially connected main shaft portion and an eccentric portion, an oil inlet channel is formed at one end of the main shaft portion, a spiral oil groove connected to the oil inlet channel is provided on the outer peripheral wall of the main shaft portion between the oil inlet channel and the eccentric portion, an oil storage section oil groove is provided between the two ends of the spiral oil groove, the lead of the oil storage section oil groove is smaller than other sections of the spiral oil groove, and the main shaft portion segments where the oil storage section oil groove is distributed form an annularly recessed main shaft oil storage groove; the eccentric portion is provided with a connecting rod shaft that cooperates with the connecting rod, an eccentric section oil groove is provided on the outer peripheral wall of the connecting rod shaft, and is connected to the spiral oil groove through the eccentric connecting hole of the main shaft, an eccentric oil storage groove is provided on the end face of the connecting rod shaft, and the eccentric oil storage groove is connected to the eccentric section oil groove through the oil outlet hole.

[0007] Furthermore, the oil inlet channel includes a first-order oil hole and a second-order oil hole connected in sequence, one end of the first-order oil hole is located at the end of the main shaft part away from the eccentric part, and the other end of the first-order oil hole is connected to the spiral oil groove through the second-order oil hole.

[0008] Furthermore, the diameter of the second-order oil hole is smaller than that of the first-order oil hole, the first-order oil hole is connected to the oil suction pipe, the second-order oil hole is connected to the spiral oil groove to form a lower oil hole, and the main shaft eccentric connecting hole is connected to the spiral oil groove to form an upper oil hole.

[0009] Furthermore, the spiral oil groove is divided into three sections, namely, a first oil groove, a second oil groove and a third oil groove. The second oil groove is an oil storage section oil groove, the first oil groove is connected to an oil inlet channel, and the third oil groove is connected to an eccentric connecting hole of the main shaft.

[0010] Furthermore, an oleophilic structure is provided on the surface of the main shaft oil storage tank, and / or an oleophilic structure is provided on the inner wall of the shaft hole of the crankshaft bearing seat matched with the outer side of the main shaft oil storage tank.

[0011] Furthermore, a main shaft oil throwing groove is provided on the outer peripheral wall of one end of the main shaft part connecting with the eccentric part, and an eccentric oil throwing groove is opened on the outer peripheral wall of the segment of the connecting rod shaft that does not match the connecting rod, and the eccentric oil throwing groove is connected to the main shaft eccentric connecting hole.

[0012] Furthermore, the eccentric segment oil tank is located at the segment where the connecting rod shaft cooperates with the connecting rod, and the oil outlet hole is connected to the bottom of the eccentric oil storage tank.

[0013] Furthermore, the diameter of the spindle oil storage groove is smaller than the diameter of the spindle section where the non-oil storage section oil groove of the spiral oil groove is distributed, so that the spindle oil storage groove is recessed in the outer peripheral wall of the spindle section.

[0014] The second object of the present invention is to provide a refrigeration device using the accumulator-type thermal expansion valve as described in the first object.

[0015] Furthermore, the main shaft portion of the self-lubricating crankshaft cooperates with the shaft hole of the crankshaft bearing seat, and the connecting rod shaft rotates to cooperate with the connecting rod.

[0016] Compared with the prior art, the present invention has the following advantages and positive effects:

[0017] In view of the problem that the crankshaft refrigeration oil cannot be pumped out in time for lubrication after the refrigeration oil returns when the compressor is frequently started and stopped, an annularly depressed main shaft oil storage tank is formed by the main shaft segments distributed with the oil storage section oil tank, thereby increasing the oil storage space. The lead of the oil storage section oil tank is smaller than that of other sections of the spiral oil tank, so that the refrigeration oil returns more slowly, thereby extending the residence time of the refrigeration oil on the crankshaft. The eccentric oil storage tank arranged on the end face of the connecting rod shaft is connected to the eccentric section oil tank through the oil outlet hole, and also plays the role of storing refrigeration oil. When restarting after shutdown, the stored refrigeration oil can be quickly put into use and can be supplied to the eccentric part and the main shaft part in time to provide initial lubrication, thereby reducing dry friction at the moment of starting, improving the reliability of the crankshaft when starting, and avoiding poor lubrication due to insufficient oil supply.

[0018] The main shaft oil reservoir and the eccentric oil reservoir are located at different key positions of the crankshaft. When the compressor starts and stops frequently, both oil storage positions can respond quickly once the start signal is issued. The main shaft oil reservoir is close to the oil inlet channel and the spiral oil tank, which can quickly provide initial lubrication for the entire main shaft and other parts connected to the main shaft. The eccentric oil reservoir is close to the eccentric part, which can provide timely lubrication for the complex moving parts connected to the eccentric part and the connecting rod. The multi-point simultaneous oil supply method shortens the time from startup to full and effective lubrication, ensuring that all parts of the crankshaft can be protected in time at the moment of startup, reducing the risk of wear caused by a short period of oil shortage during startup.

[0019] An oleophilic structure is arranged on the surface of the main shaft oil storage tank and the inner wall of the shaft hole of the crankshaft bearing seat matched with the outer side of the main shaft oil storage tank, which can generate a stronger affinity with the refrigeration oil, making the oil easier to adhere to the surface of the main shaft oil storage tank and the inner wall of the shaft hole. During the operation of the crankshaft, even if it is affected by external forces such as centrifugal force, the oil can adhere to these surfaces more firmly and is not easily thrown out of the oil storage tank, thereby improving the actual oil storage capacity of the oil storage tank and ensuring that there is sufficient oil reserve for lubrication.

[0020] An eccentric oil-slinging groove and a main shaft oil-slinging groove are arranged to respectively throw part of the refrigeration oil into the gap between the piston and the pump body under the action of centrifugal force to lubricate the reciprocating piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 Schematic diagram of the self-lubricating crankshaft and the distribution of spiral oil grooves in one or more embodiments of the present invention.

[0023] Figure 2 Schematic diagram of a self-lubricating crankshaft in one or more embodiments of the present invention.

[0024] Figure 3 Schematic diagram of the external structure of a self-lubricating crankshaft in one or more embodiments of the present invention.

[0025] Among them, 1. first-order oil hole; 2. second-order oil hole; 3. lower oil hole; 4. first oil groove; 5. second oil groove; 6. main shaft oil storage groove; 7. third oil groove; 8. upper oil hole; 9. main shaft oil-swinging groove; 10. main shaft eccentric connecting hole; 11. eccentric oil hole; 12. eccentric oil-swinging groove; 13. eccentric section oil groove; 14. oil outlet hole; 15. eccentric oil storage groove; 16. air vent. DETAILED DESCRIPTION

[0026] Example 1

[0027] In a typical embodiment of the present invention, Figure 1-Figure 3 As shown, a self-lubricating crankshaft is provided.

[0028] In the prior art, when the compressor is frequently started and stopped, the crankshaft refrigeration oil cannot be pumped for lubrication in time after refrigeration oil refluxes, resulting in severe dry friction at the moment of starting and poor lubrication conditions on the crankshaft surface, affecting the reliability and service life of the compressor. Based on this, this embodiment provides a self-lubricating crankshaft, which uses the main shaft and eccentric part of the crankshaft to respectively establish oil storage structures, and can gradually release the refrigeration oil in the oil storage structure when the compressor is stopped. When the compressor is frequently started and stopped, it can provide initial lubrication for the main shaft and eccentric part, thereby reducing dry friction at the moment of starting and improving the reliability of the crankshaft when starting.

[0029] like Figure 1-Figure 3As shown, the self-lubricating crankshaft is divided into a main shaft portion and an eccentric portion which are axially butted together. The main shaft portion is provided with an oil inlet channel and a spiral oil groove. An oil storage section oil groove is provided between the two ends of the spiral oil groove. The lead of the oil storage section oil groove is smaller than that of other sections of the spiral oil groove. The main shaft segments where the oil storage section oil groove is distributed form an annularly depressed main shaft oil storage groove 6. The eccentric portion is provided with an eccentric section oil groove 13 and an eccentric oil storage groove 15. The eccentric section oil groove 13 is connected to the spiral oil groove through the main shaft eccentric connecting hole 10. The eccentric oil storage groove 15 is connected to the eccentric section oil groove 13 through the oil outlet hole 14, thereby establishing a flow path for the refrigeration oil.

[0030] For the main shaft structure, such as Figure 1 As shown, the oil inlet channel is arranged at one end of the main shaft part and can be connected to the oil suction pipe. It is the entrance for the refrigeration oil to enter the crankshaft system and provide an oil source for the subsequent lubrication process.

[0031] like Figure 1 and Figure 2 As shown, the spiral oil groove is located on the outer peripheral wall of the main shaft between the oil inlet channel and the eccentric part, and is connected to the oil inlet channel. The spiral oil groove is distributed in a spiral line shape and is recessed in the outer peripheral wall of the main shaft. The spiral oil groove guides the refrigeration oil to flow along the outer peripheral wall of the main shaft, and can evenly transport the refrigeration oil entering from the oil inlet channel to various parts of the main shaft, on the one hand, realizing the initial lubrication of the main shaft, and on the other hand, it can serve as a channel to transport the refrigeration oil to the eccentric part.

[0032] An oil storage section oil tank is arranged between the two ends of the spiral oil tank. The oil storage section oil tank is a section in the middle of the spiral oil tank. The lead of the oil storage section oil tank is smaller than the lead of other sections of the spiral oil tank, so as to slow down the speed of the refrigeration oil flowing through the oil storage section oil tank, prolong the residence time of the refrigeration oil in this section, which is conducive to the storage of oil.

[0033] In addition, the main shaft segments where the oil storage section oil tanks are distributed form an annularly recessed main shaft oil storage tank 6. The main shaft oil storage tank 6 is recessed relative to the outer peripheral walls of other segments of the main shaft, that is, the diameter of the main shaft oil storage tank 6 is smaller than the diameters at other positions. The main shaft oil storage tank 6 increases the oil storage space. During the operation of the crankshaft, excess refrigeration oil can be stored to provide reserves for subsequent lubrication.

[0034] In this embodiment, the diameter of the main shaft oil storage tank 6 is smaller than the diameter of the main shaft section where the non-oil storage section oil tank of the spiral oil tank is distributed, so that the main shaft oil storage tank 6 is recessed in the outer peripheral wall of the main shaft. On the one hand, the oil storage space is increased, providing conditions for storing more refrigeration oil; on the other hand, the recessed structure helps to better gather the oil in the oil storage tank by centrifugal force during the operation of the crankshaft, thereby reducing the loss of oil. At the same time, the recessed structure has little effect on the overall structural strength of the main shaft, and also reduces the friction surface, ensuring the stability of the main shaft when bearing various loads, and optimizing the oil storage and lubrication performance without affecting the normal operation of the main shaft.

[0035] like Figure 1 and Figure 3 As shown, the eccentric part is provided with a connecting rod shaft that matches the connecting rod, which is a key component to realize the eccentric motion of the crankshaft and drive the connecting rod to work. The eccentric section oil groove 13 is located on the outer peripheral wall of the connecting rod shaft, and is connected to the spiral oil groove through the main shaft eccentric connecting hole 10, and the refrigeration oil transported from the spiral oil groove of the main shaft is guided to the eccentric part to provide lubrication for the connection between the eccentric part and the connecting rod.

[0036] The eccentric oil storage tank 15 is arranged on the end face of the connecting rod shaft and is connected to the eccentric oil tank 13 through the oil outlet hole 14. During the operation of the eccentric part, the eccentric oil storage tank 15 can store a certain amount of refrigeration oil, which can flow back to the eccentric oil tank 13 through the oil outlet hole 14 when the compressor is restarted after being stopped, so as to quickly provide initial lubrication for the eccentric part.

[0037] When restarting after shutdown, the refrigeration oil stored in the main shaft oil storage tank 6 and the eccentric oil storage tank 15 can be quickly put into use and supplied to the eccentric part and the main shaft part in time, reducing the dry friction at the moment of starting, improving the reliability of the crankshaft when starting, and effectively avoiding poor lubrication caused by insufficient oil supply. The spiral oil groove continuously transports the oil from the oil inlet channel to various parts of the main shaft part, ensuring the continuous lubrication of the main shaft during normal operation; the eccentric section oil groove 13 introduces oil into the eccentric part, so that the eccentric part can also be continuously lubricated, thereby improving the lubrication conditions of the entire crankshaft system and extending the service life of the crankshaft.

[0038] The oil stored in the oil storage section tank and the main shaft oil storage tank 6 can regulate and supplement the lubrication of the main shaft part under different working conditions, ensuring the stability of lubrication; the eccentric oil storage tank 15 provides additional guarantee for the lubrication of the eccentric part, so that the eccentric part can obtain stable lubrication during complex movement, thereby improving the operating stability of the entire crankshaft system.

[0039] like Figure 1 As shown, the oil inlet channel is composed of a first-order oil hole 1 and a second-order oil hole 2 connected in sequence, as the first section of the oil pump structure. One end of the first-order oil hole 1 is located at the end of the main shaft away from the eccentric part, which is used to connect the oil suction pipe. It is the starting entrance for the refrigeration oil to enter the crankshaft system and provide the initial oil source for the entire lubrication process. The diameter of the second-order oil hole 2 is smaller than that of the first-order oil hole 1, forming a throttling effect, which helps to control the flow rate and flow of the refrigeration oil entering the spiral oil groove, ensuring that the oil is more stable in the subsequent transportation process, and avoiding uneven distribution of the oil or ineffective storage due to excessive flow rate. The second-order oil hole 2 is also connected to the vent hole 16.

[0040] The second-order oil hole 2 is connected to the spiral oil groove to form a lower oil hole 3. The oil inlet channel can effectively attract the refrigeration oil to the lower oil hole 3 quickly and in large quantities through the action of centrifugal force, ensuring that the refrigeration oil can be injected into the spiral oil groove.

[0041] like Figure 1 As shown, the spiral oil groove is divided into the first oil groove 4, the second oil groove 5 and the third oil groove 7 in sequence, with a total of three sections, and the spiral oil groove serves as the second section of the oil pump structure. The first oil groove 4 is connected to the oil inlet channel, and can quickly receive the refrigeration oil transported from the oil inlet channel, and initially guide it to the outer peripheral wall of the main shaft along the spiral path. The second oil groove 5 serves as an oil storage section oil groove, and its lead is smaller than that of the other two sections. It can slow down the oil flow rate, increase the oil storage capacity, and provide a continuous and stable oil reserve for the lubrication of the crankshaft. The third oil groove 7 is connected to the main shaft eccentric connecting hole 10, and is responsible for transporting the refrigeration oil treated by the first oil groove 4 and the second oil groove 5 to the eccentric part, ensuring that the eccentric part can also be well lubricated. The segmented design makes the function of the spiral oil groove more refined, and different stages undertake different tasks, which improves the efficiency and reliability of the entire lubrication system.

[0042] In this embodiment, the first section of the spiral oil groove is the first oil groove 4 with a lead of 50 mm, the second section is the second oil groove 5 with a lead of 20 mm, and the third section is the third oil groove 7 with a lead of 50 mm. The above three sections lubricate the main shaft respectively; the helix angle of the first oil groove 4 is relatively large, so that the first oil groove 4 is relatively steep as a whole, and the refrigeration oil can be quickly transported to the second oil groove 5. The second oil groove 5 has a smaller helix angle than the first oil groove 4, so that the second oil groove 5 is slower than the first oil groove 4. It is surrounded by the main shaft oil storage groove 6, which can ensure that the refrigeration oil passes through this section slowly, which is conducive to storing it in the main shaft oil storage groove 6 in time, and preventing the intermittent oil supply from causing wear of the moving parts; the third oil groove 7 has the same helix angle as the third oil groove 7, and is also relatively steep, and is also for quick oiling.

[0043] like Figure 1 and Figure 2 As shown, an oleophilic structure is provided on the surface of the spindle oil storage tank 6 and on the inner wall of the shaft hole of the crankshaft bearing seat matched with the outer side of the spindle oil storage tank 6. The oleophilic structure can enhance the affinity with the refrigeration oil, making the oil more easily adhere to these surfaces.

[0044] During the operation of the crankshaft, the oleophilic structure helps to maintain the stability of the oil in the oil tank and prevent the oil from being lost in large quantities due to factors such as centrifugal force. At the same time, when the crankshaft is started, the oleophilic structure can quickly guide the stored oil to the friction parts, shorten the lubrication response time, further reduce the dry friction during startup, and improve the reliability and lubrication effect of the crankshaft startup. In addition, the oleophilic structure can also make the oil form a more uniform and stable oil film on the friction surface, reduce the friction coefficient, and extend the service life of the crankshaft and bearing seat.

[0045] In this embodiment, the oleophilic structure on the surface of the spindle oil storage tank 6 can be established in a variety of ways. A microscopic concave-convex structure can be formed on the surface of the spindle oil storage tank 6 by a chemical etching process, which can increase the surface roughness and make the oil easier to adhere. For example, an acid solution is used to etch the surface of the oil storage tank, and the etching time and concentration are controlled to form a texture similar to a honeycomb or a tiny gully, thereby increasing the contact area between the oil and the surface and enhancing the oleophilic effect.

[0046] It is also possible to apply an oleophilic coating, such as a fluoropolymer coating, to the surface of the oil storage tank. This type of coating has an extremely low surface energy and a strong affinity for refrigeration oil. The coating can be applied by spraying the coating material evenly on the surface of the oil storage tank. After high-temperature curing, a firm and durable oleophilic layer is formed to ensure that the oil can be stably adsorbed during long-term use.

[0047] The inner wall of the shaft hole of the crankshaft bearing seat matched with the outer side of the main shaft oil storage tank 6 is provided with an oleophilic structure, which can be established by inlaying a material with good oleophilic performance on the inner wall of the shaft hole, such as a porous bronze alloy, which has many tiny pores, can store a certain amount of oil, and has a high affinity for refrigeration oil. When machining the shaft hole, an inlay position is reserved, and the processed porous bronze alloy inlay is pressed into the inner wall of the shaft hole so that it is tightly combined with the shaft hole, thereby providing a continuous oleophilic effect for the mating surface of the shaft and the bearing seat.

[0048] Laser processing technology can also be used to create micro-nano textures on the inner wall of the shaft hole, forming textures of specific shapes and densities on the inner wall of the shaft hole. These textures can guide the oil to be evenly distributed between the shaft and the bearing seat, while enhancing the adhesion of the oil. For example, creating parallel or cross micro-nano groove textures can effectively improve the oil-wetting performance and lubrication effect.

[0049] like Figure 1 and Figure 3 As shown, a main shaft oil throwing groove 9 is provided on the outer peripheral wall of one end of the main shaft part that is connected to the eccentric part, and an eccentric oil throwing groove 12 is provided on the outer peripheral wall of the segment of the connecting rod shaft that is not matched with the connecting rod, and the eccentric oil throwing groove 12 is connected to the main shaft eccentric connecting hole 10. When the crankshaft rotates at high speed, the oil will be affected by centrifugal force. The main shaft oil throwing groove 9 can throw the oil to the contact part between the main shaft and other parts, further improving the lubrication effect of the main shaft. The eccentric oil throwing groove 12 is connected to the main shaft eccentric connecting hole 10 to throw the oil to the key part where the eccentric part and the connecting rod are connected, thereby enhancing the lubrication reliability of the eccentric part, ensuring that the easily worn parts can also be fully lubricated under complex motion conditions, and reducing the probability of wear and failure.

[0050] Specifically, in this embodiment, the eccentric oil-slinging groove 12 and the main shaft oil-slinging groove 9 respectively swing part of the refrigeration oil into the gap between the piston and the cylinder body under the action of centrifugal force to lubricate the reciprocating piston.

[0051] like Figure 3 As shown, the eccentric oil tank 13 is located in the connecting rod shaft matching the connecting rod segment, and the oil outlet 14 is connected to the bottom of the eccentric oil storage tank 15. This ensures that the eccentric oil storage tank 15 can fully utilize the gravity of the oil when storing the oil. When the compressor is restarted after being shut down, the oil stored at the bottom of the eccentric oil storage tank 15 can flow into the eccentric oil tank 13 quickly and smoothly through the oil outlet 14 under the action of gravity, providing timely initial lubrication for the eccentric part. At the same time, the bottom access design also avoids the accidental outflow of oil from the eccentric oil storage tank 15 due to shaking and other reasons during the movement of the eccentric part, ensuring the stability of oil storage and supply.

[0052] The refined structure of the oil inlet channel ensures the stability and accuracy of oil input; the segmented design of the spiral oil groove improves the efficiency of lubrication delivery and storage; the oleophilic structure enhances the adhesion and lubrication effect of the oil; the oil-slinging groove uses centrifugal force to assist lubrication; the bottom connection of the eccentric section oil groove 13 and the eccentric oil storage groove 15 ensures the timeliness and stability of the lubrication of the eccentric part; the recessed design of the main shaft oil storage groove 6 optimizes the oil storage and structural stability. In summary, the synergistic effect of these structures has significantly improved the crankshaft in terms of starting reliability, lubrication continuity and stability, effectively solving the problem of poor crankshaft lubrication when the compressor is frequently started and stopped in the prior art, further improving the reliability and service life of the compressor, and reducing maintenance costs.

[0053] In order to further improve the strength of the crankshaft surface, the crankshaft surface can also be nitrided.

[0054] Example 2

[0055] In another typical embodiment of the present invention, Figure 1-Figure 3 As shown, a refrigeration device is provided, which utilizes the self-lubricating crankshaft as in Example 1.

[0056] The main shaft of the self-lubricating crankshaft matches the shaft hole of the crankshaft bearing seat. The main shaft rotates in the shaft hole, and the spiral oil groove, oil storage section oil groove and main shaft oil storage groove 6 on the main shaft can ensure that there is always good lubrication between the main shaft and the crankshaft bearing seat during operation. Good lubrication can not only reduce the friction between the main shaft and the crankshaft bearing seat, reduce wear, and extend the service life of components, but also reduce energy loss and improve the efficiency of the compressor.

[0057] Especially when the compressor is frequently started and stopped, the refrigeration oil stored in the main shaft oil storage tank 6 can quickly provide lubrication for the contact part between the shaft hole and the main shaft part, avoiding damage caused by dry friction and ensuring that the main shaft part can rotate smoothly in the shaft hole every time the compressor is started.

[0058] The connecting rod shaft rotates to match the connecting rod, and the eccentric oil tank 13 guides the refrigeration oil delivered from the spiral oil tank of the main shaft to the connecting part of the connecting rod shaft and the connecting rod to provide lubrication. When the compressor is working, the connecting rod shaft drives the connecting rod to do reciprocating motion, and the connecting part is subjected to greater pressure and friction. When the eccentric oil storage tank 15 is restarted after shutdown, it can quickly provide initial lubrication for this part to reduce wear at the moment of startup.

[0059] During normal operation, the eccentric section oil groove 13 continuously supplies lubricating oil, ensuring the smoothness of the cooperation between the connecting rod shaft and the connecting rod, so that the mechanical transmission part of the compressor operates stably, thereby ensuring that the refrigeration cycle of the refrigeration equipment can be carried out stably and efficiently.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-lubricating crankshaft, characterized in that: It includes an axially connected main shaft portion and an eccentric portion, an oil inlet channel is formed at one end of the main shaft portion, a spiral oil groove connected to the oil inlet channel is provided on the outer peripheral wall of the main shaft portion between the oil inlet channel and the eccentric portion, an oil storage section oil groove is provided between the two ends of the spiral oil groove, the lead of the oil storage section oil groove is smaller than other sections of the spiral oil groove, and the main shaft portion segments where the oil storage section oil groove is distributed form an annularly recessed main shaft oil storage groove; the eccentric portion is provided with a connecting rod shaft that cooperates with the connecting rod, an eccentric section oil groove is provided on the outer peripheral wall of the connecting rod shaft, and is connected to the spiral oil groove through the eccentric connecting hole of the main shaft, an eccentric oil storage groove is provided on the end face of the connecting rod shaft, and the eccentric oil storage groove is connected to the eccentric section oil groove through the oil outlet hole.

2. The self-lubricating crankshaft according to claim 1, characterized in that: The oil inlet passage comprises a first-order oil hole and a second-order oil hole which are connected in sequence. One end of the first-order oil hole is located at an end of the main shaft part away from the eccentric part, and the other end of the first-order oil hole is connected to the spiral oil groove through the second-order oil hole.

3. The self-lubricating crankshaft according to claim 2, characterized in that: The diameter of the second-order oil hole is smaller than that of the first-order oil hole. The first-order oil hole is connected to the oil suction pipe, the second-order oil hole is connected to the spiral oil groove to form a lower oil hole, and the main shaft eccentric connecting hole is connected to the spiral oil groove to form an upper oil hole.

4. The self-lubricating crankshaft according to claim 1, characterized in that: The spiral oil groove is divided into three sections: a first oil groove, a second oil groove and a third oil groove. The second oil groove is an oil storage section oil groove. The first oil groove is connected to the oil inlet channel. The third oil groove is connected to the eccentric connecting hole of the main shaft.

5. The self-lubricating crankshaft according to claim 1 or 4, characterized in that: The surface of the main shaft oil storage tank is provided with an oleophilic structure, and / or the inner wall of the shaft hole of the crankshaft bearing seat matched with the outer side of the main shaft oil storage tank is provided with an oleophilic structure.

6. The self-lubricating crankshaft according to claim 1, characterized in that: A main shaft oil throwing groove is arranged on the outer peripheral wall of one end of the main shaft part butting against the eccentric part, and an eccentric oil throwing groove is arranged on the outer peripheral wall of the segment of the connecting rod shaft not matching with the connecting rod, and the eccentric oil throwing groove is connected to the main shaft eccentric connecting hole.

7. The self-lubricating crankshaft according to claim 6, characterized in that: The eccentric segment oil tank is located at the segment where the connecting rod shaft matches the connecting rod, and the oil outlet hole is connected to the bottom of the eccentric oil storage tank.

8. The self-lubricating crankshaft according to claim 1, characterized in that: The diameter of the main shaft oil storage groove is smaller than the diameter of the main shaft section where the oil grooves in the non-oil storage section of the spiral oil groove are distributed, so that the main shaft oil storage groove is recessed in the outer peripheral wall of the main shaft section.

9. A refrigeration device, characterized in that: Utilize the self-lubricating crankshaft as claimed in any one of claims 1-8.

10. The refrigeration device according to claim 9, characterized in that: The main shaft portion of the self-lubricating crankshaft is matched with the shaft hole of the crankshaft bearing seat, and the connecting rod shaft rotates to match the connecting rod.

Images