A crankshaft-main bearing assembly, compressor pump body assembly, and compressor

Abstract

The application discloses a crankshaft-main bearing assembly, a compressor pump body assembly and a compressor, and relates to the technical field of compressors. The long shaft part of the crankshaft is matched with the main bearing inner hole of the main bearing; the axial center of the crankshaft is provided with a center oil hole; the center oil hole is a blind hole structure; the surface of the long shaft part is provided with an upper radial oil hole; the first end of the upper radial oil hole is communicated with the blind end of the center oil hole; the second end of the upper radial oil hole is communicated with the surface of the long shaft part; the upper radial oil hole is located above the bearing upper top surface of the main bearing; an oil storage groove is arranged on the bearing upper top surface; the oil storage groove is used for storing the refrigerating machine oil flowing out through the upper radial oil hole and overflowing the stored refrigerating machine oil to the contact surface between the main bearing inner hole and the long shaft part; the oil film thickness of the main bearing inner hole and the crankshaft long shaft is increased, the wear between the crankshaft long shaft and the upper end of the main bearing inner hole is effectively reduced, and the reliability of the pump body assembly operation is improved.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, and specifically relates to a crankshaft-main bearing assembly, a compressor pump body assembly, and a compressor. Background Technology

[0002] Currently, with the development of compressor technology, in order to meet the requirements of compressor efficiency, the shaft diameters of the long and short shafts of the crankshaft are getting smaller and smaller, resulting in a decrease in the stiffness of the crankshaft and a reduction in its resistance to deformation. When the compressor starts up or the motor speed increases, due to the increase in the compressor's operating inertial force and inertial torque, the oil film thickness between the long shaft and the upper end of the inner hole of the main bearing becomes insufficient, which in turn increases the wear between the main bearing and the long shaft. In severe cases, it can cause the friction temperature of this part to rise sharply, resulting in material adhesion and ultimately causing the pump body assembly to fail. Summary of the Invention

[0003] In view of the technical problems existing in the prior art, the present invention provides a crankshaft-main bearing assembly, a compressor pump body assembly and a compressor to solve the technical problem of insufficient oil film thickness between the long shaft and the upper end of the inner hole of the main bearing.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] This invention provides a crankshaft-main bearing assembly, including a crankshaft and a main bearing; the long shaft portion of the crankshaft is fitted into the inner bore of the main bearing of the main bearing; a central oil passage hole is provided at the axial center of the crankshaft; wherein, the central oil passage hole is a blind hole structure;

[0006] The surface of the long shaft portion is provided with an upper radial oil outlet hole. The first end of the upper radial oil outlet hole communicates with the blind end of the central oil passage hole, and the second end of the upper radial oil outlet hole communicates with the surface of the long shaft portion. The upper radial oil outlet hole is located above the top surface of the main bearing.

[0007] An oil reservoir is provided on the top surface of the bearing; wherein, the oil reservoir is used to store the refrigeration oil flowing out through the upper radial oil outlet hole, and to overflow the stored refrigeration oil to the contact surface between the inner hole of the main bearing and the long shaft portion.

[0008] Furthermore, the central oil passage includes an axially connected mounting hole section and a head hole section;

[0009] The mounting hole section is located on the side close to the short shaft portion of the crankshaft, and an oil suction plate is installed inside the mounting hole section; the head hole section is located on the side away from the short shaft portion, and the upper radial oil outlet is located at the end of the head hole section;

[0010] The distance m between the centerline of the upper radial oil outlet hole and the top surface of the main bearing satisfies: Ψ≥m≥1 / 2Ψ; where Ψ is the diameter of the upper radial oil outlet hole.

[0011] Furthermore, the oil reservoir is an annular open groove; wherein, the open end of the oil reservoir communicates with the top surface of the bearing, and the bottom of the oil reservoir extends along the center line of the inner hole of the main bearing toward the bottom surface of the main bearing.

[0012] Furthermore, the height h1 of the inner wall of the oil storage tank is less than the height h2 of the outer wall of the oil storage tank.

[0013] The diameter d1 of the inner wall of the oil groove satisfies: d1≥D1; where D1 is the diameter of the inner hole of the main bearing; the diameter d2 of the outer wall of the oil groove satisfies: D2-1mm≥d2≥d1+1mm; where D2 is the outer diameter of the top surface of the main bearing.

[0014] Furthermore, the top surface of the main bearing is provided with a plurality of oil guide grooves; the plurality of oil guide grooves are evenly distributed circumferentially around the axis of the inner hole of the main bearing, one end of the oil guide groove is connected to the hole wall of the inner hole of the main bearing, and the other end of the oil guide groove is connected to the oil storage groove.

[0015] Furthermore, a spiral oil groove is provided on the inner wall of the main bearing bore, and one of the oil guide grooves communicates with the spiral oil groove.

[0016] Furthermore, the inner wall of the main bearing bore is provided with a plurality of oil storage structures; wherein, the oil storage structure is an open groove structure provided on the inner wall of the main bearing bore; the oil storage structure is provided in a one-to-one correspondence with the oil guide groove and is located below the oil guide groove.

[0017] Furthermore, the width w of the oil storage structure along the circumferential direction of the inner hole of the main bearing satisfies: 1.5b ≥ w ≥ 1.1b; the depth H of the oil storage structure along the axial direction of the inner hole of the main bearing satisfies: 2h2 ≥ H ≥ h2; the depth f of the oil storage structure along the radial direction of the inner hole of the main bearing satisfies: 0.1mm ≤ f ≤ 0.5mm; where b is the width of the oil guide groove and h2 is the height of the outer wall of the oil groove.

[0018] The present invention also provides a compressor pump body assembly, including the aforementioned crankshaft-main bearing assembly.

[0019] The present invention also provides a compressor, including the aforementioned compressor pump assembly.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention provides a crankshaft-main bearing assembly, a compressor pump body assembly, and a compressor. The crankshaft's central oil passage is configured as a blind hole to increase the pressure of the refrigerant oil within it. An oil reservoir is provided on the top surface of the bearing, storing refrigerant oil flowing out through the upper radial oil outlet. This reservoir also allows the stored refrigerant oil to overflow onto the contact surface between the inner bore of the main bearing and the long shaft portion, effectively increasing the oil film thickness between the upper end of the main bearing inner bore and the long shaft portion. This reduces wear on the crankshaft long shaft and the upper end of the main bearing inner bore during compressor operation, especially during secondary startup or when the motor speed increases, thus improving the reliability of the pump body assembly.

[0022] Furthermore, the central oil passage adopts an axially connected mounting hole and a head hole, with an oil suction plate installed in the mounting hole and the upper radial oil outlet connected to the head hole. When the compressor is running, the oil suction plate draws the refrigerant oil from the oil sump at the bottom of the compressor housing into the central oil passage. The refrigerant oil continuously rises in the central oil passage, and when the oil level reaches the upper radial oil outlet, it flows into the oil reservoir on the top surface of the main bearing for storage, ensuring a continuous supply of refrigerant oil in the oil reservoir.

[0023] Furthermore, the height of the inner wall of the oil storage tank is designed to be less than the height of the outer wall of the oil storage tank, so that the refrigeration oil in the oil storage tank can flow into the contact surface between the inner hole of the main bearing and the long shaft.

[0024] Furthermore, several oil guide grooves are set on the top surface of the main bearing. The guiding effect of the oil guide grooves ensures that the refrigeration oil can flow smoothly and evenly to the contact surface between the inner hole of the main bearing and the long shaft, thus ensuring the uniformity of the oil film between the inner hole of the main bearing and the long shaft.

[0025] Furthermore, by setting up an oil storage structure, the amount of refrigeration oil between the upper end of the main bearing inner bore and the long shaft section is increased, thereby improving the oil film strength.

[0026] Furthermore, one of the oil guide grooves is connected to the spiral oil groove, so that the refrigeration oil in the oil storage tank is guided into the spiral oil groove, thereby increasing the overall thickness of the oil film between the inner hole of the main bearing and the long shaft. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the crankshaft-main bearing assembly described in Example 1;

[0028] Figure 2 This is a schematic diagram of the overall structure of the crankshaft in Example 1;

[0029] Figure 3 This is a cross-sectional view of the crankshaft in Example 1;

[0030] Figure 4 This is a three-dimensional structural diagram of the main bearing in Example 1;

[0031] Figure 5 This is a cross-sectional view of the main bearing in Example 1;

[0032] Figure 6 for Figure 5 Enlarged structural diagram at point A;

[0033] Figure 7 for Figure 6 Enlarged structural diagram at point B;

[0034] Figure 8 This is a three-dimensional structural diagram of the main bearing in Example 2;

[0035] Figure 9 This is a schematic diagram of the compressor structure described in Example 4.

[0036] The components include: 1. crankshaft; 2. main bearing; 3. auxiliary bearing; 4. rotor; 5. bottom oil sump; 6. oil suction plate; 7. cylinder; 11. long shaft section; 12. eccentric section; 13. short shaft section; 14. central oil passage hole; 15. lower radial oil suction hole; 16. upper radial oil suction hole; 141. mounting hole section; 142. head hole section; 21. main bearing inner hole; 22. spiral oil groove; 23. main bearing top surface; 211. upper end of inner hole; 212. oil storage structure; 231. oil reservoir; 2311. inner wall of oil reservoir; 2312. outer wall of oil reservoir; 2313. bottom of oil reservoir; 232. oil guide groove. Detailed Implementation

[0037] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0038] Example 1

[0039] As attached Figures 1-7 As shown, this embodiment 1 provides a crankshaft-main bearing assembly, including a crankshaft 1 and a main bearing 2; the crankshaft 1 includes a long shaft portion 11, an eccentric portion 12 and a short shaft portion 13 connected axially in sequence; the main bearing 2 has a main bearing inner hole 21 at its center, and the long shaft portion 11 fits and passes through the main bearing inner hole 21.

[0040] As attached Figures 2-3As shown, a central oil passage hole 14 is provided at the axial center of the crankshaft 1; wherein, the central oil passage hole 14 is a blind hole structure, the open end of the central oil passage hole 14 communicates with the shaft end of the short shaft portion 13, and the blind end of the central oil passage hole 14 is located inside the long shaft portion 11; the surface of the long shaft portion 11 is provided with a lower radial oil outlet hole 15 and an upper radial oil outlet hole 16, the lower radial oil outlet hole 15 is located near the end of the eccentric portion 12, and the upper radial oil outlet hole 16 is located away from the end of the eccentric portion 12.

[0041] Specifically, the central oil passage 14 includes an axially connected mounting hole section 141 and a head hole section 142; the mounting hole section 141 is located near the short shaft portion 13, and an oil suction plate 6 is fitted inside the mounting hole section 141; the head hole section 142 is located away from the short shaft portion 13; wherein, the oil suction plate 6 and the mounting hole section 141 are interference-fitted to fix the oil suction plate 6 using the mounting hole section 141.

[0042] Specifically, the first end of the lower radial oil outlet hole 15 is connected to the central oil passage hole 14, and the second section of the lower radial oil outlet hole 15 is connected to the surface of the upper shaft portion 11.

[0043] Specifically, the upper radial oil outlet 16 is located at the end of the head hole section 142 and above the bearing top surface 23 of the main bearing 2; the first end of the upper radial oil outlet 16 communicates with the blind end of the central oil passage 14, and the second end of the upper radial oil outlet 16 communicates with the surface of the long shaft portion 11.

[0044] Preferably, after the main bearing 2 is assembled with the long shaft portion 11, the distance between the center line of the upper radial oil outlet hole 16 and the upper top surface 23 of the main bearing satisfies: Ψ≥m≥1 / 2Ψ; where Ψ is the diameter of the upper radial oil outlet hole 16.

[0045] Preferably, the end of the head hole section 142 is a conical bottom surface with a central angle of 150°, that is, the blind end bottom surface of the central oil passage 14 is a conical bottom surface with a central angle of 150°; wherein, the distance L between the conical bottom surface and the center line of the upper radial oil outlet 16 satisfies: 2Ψ≥L≥1 / 2Ψ.

[0046] In Embodiment 1, the crankshaft central oil passage hole 14 is set as a blind hole to increase the oil pressure; the crankshaft central oil passage hole 14 is communicated with the surface of the long shaft portion 11 through the lower radial oil outlet hole 15 and the upper radial oil outlet hole 16; when the compressor is running, the oil suction sheet 6 in the mounting hole section 141 sucks the refrigeration oil in the bottom oil sump of the compressor into the central oil passage hole 14, and the refrigeration oil continuously moves upward in the central oil passage hole 14. When the oil level reaches the lower radial oil outlet hole 15, a part of the refrigeration oil flows out along the lower radial oil outlet hole 15, and the remaining refrigeration oil continues to move upward to flow out through the upper radial oil outlet hole 16. <� <�

[0047] As shown in the <� Figures 4-7 accompanying drawings, a spiral oil groove 22 is provided on the inner wall of the main bearing inner hole 21; wherein, the starting end of the spiral oil groove 22 starts from the lower bottom surface of the main bearing 21 and spirally arranges upward along the inner wall of the main bearing inner hole 21 until it terminates at the upper top surface 23 of the main bearing 21; wherein, the second end of the lower radial oil outlet groove 15 is located at the starting end of the spiral oil groove 22. [[ID=⑥]]<� [[ID=⑦]]<�

[0048] [[ID=⑧]]As shown in the [[ID=⑨]]<� Figures 4-7 [[ID=⑩]]accompanying drawings, an oil storage groove 231 is provided on the upper top surface 23 of the bearing; the oil storage groove 231 is used for storing the refrigeration oil flowing out through the upper radial oil outlet hole 16 and overflowing the stored refrigeration oil to the contact surface between the main bearing inner hole 21 and the long shaft portion 11. [[ID=⑪]]<� [[ID=⑫]]<�

[0049] [[ID=⑬]]Specifically, the oil storage groove 231 is an annular open groove; wherein, the open end of the oil storage groove 231 is communicated with the upper top surface 23 of the bearing, and the bottom of the oil storage groove 231 extends along the center line of the main bearing inner hole 21 towards the lower bottom surface of the main bearing 2. [[ID=⑭]]<� [[ID=⑮]]<�

[0050] [[ID=⑯]]The height of the inner wall 2311 of the oil storage groove 231 is different from the height of the outer wall 2312 of the oil storage groove 231; wherein, the height h1 of the inner wall 2311 of the oil storage groove 231 is less than the height h2 of the outer wall 2312 of the oil storage groove 231, so that the refrigeration oil stored in the oil storage groove 231 can actively flow to the contact surface between the main bearing 2 and the long shaft portion 11; preferably, h1 < h2 ≤ 5 mm; that is, the height h1 of the inner wall 2311 of the oil storage groove 231 and the height h2 of the outer wall 2312 of the oil storage groove 231 are both less than or equal to 5 mm; the diameter d1 of the inner wall 2311 of the oil groove satisfies: d1 ≥ D1; wherein, D1 is the diameter of the main bearing inner hole 21; the diameter d2 of the outer wall 2312 of the oil groove satisfies: D2 - 1 mm ≥ d2 ≥ d1 + 1 mm; wherein, D2 is the outer diameter of the upper top surface 23 of the main bearing. [[ID=⑰]]<� [[ID=⑱]]<�

[0051] [[ID=⑲]]As shown in the It should be noted that in the above translation, the angle brackets in the original text tags are retained as they are. If there is a specific requirement for these angle brackets in the actual use scenario, further adjustment may be needed according to the rules. Also, the content of the text is translated according to the general meaning, and for some specific terms in the patent field, it is recommended to verify with relevant professionals to ensure the accuracy of the translation.Figures 4-7 As shown, the top surface 23 of the main bearing is also provided with a plurality of oil guide grooves 232; the plurality of oil guide grooves 232 are evenly distributed circumferentially around the axis of the inner hole 21 of the main bearing, one end of the oil guide groove 232 is connected to the hole wall of the inner hole 21 of the main bearing, and the other end of the oil guide groove 232 is connected to the oil storage groove 231; and one of the oil guide grooves 232 is connected to the spiral oil groove 22.

[0052] Preferably, at least two guide grooves 232 are evenly distributed circumferentially around the axis of the main bearing inner hole 21; one end of the guide groove 232 is connected to the main bearing inner hole 21 radially, and the other end is connected to the oil storage groove 231; the width b of the guide groove 232 satisfies: b≤2mm, and the bottom surface of the guide groove is lower than or flush with the bottom 2313 of the oil storage groove 231.

[0053] As attached Figures 4-7 As shown, a plurality of oil storage structures 212 are also provided on the bore wall of the main bearing inner bore 21; wherein, the oil storage structure 212 is an open groove structure provided on the bore wall of the main bearing inner bore 21; the oil storage structure 212 is provided in a one-to-one correspondence with the oil guide groove 232 and is located below the oil guide groove 232.

[0054] Specifically, the width w of the oil storage structure 212 along the circumferential direction of the inner hole 21 of the main bearing satisfies: 1.5b ≥ w ≥ 1.1b; the depth H of the oil storage structure 212 along the axial direction of the inner hole 21 of the main bearing satisfies: 2h2 ≥ H ≥ h2; the depth f of the oil storage structure 212 along the radial direction of the inner hole 21 of the main bearing satisfies: 0.1mm ≤ f ≤ 0.5mm; where b is the width of the oil guide groove 232 and h2 is the height of the outer wall 2312 of the oil groove.

[0055] In this embodiment 1, an oil storage groove 231 is provided on the top surface 23 of the main bearing 2. The oil storage groove 231 is connected to the inner hole 21 of the main bearing and the spiral oil groove 22 by the oil guide groove 232. The refrigeration oil flowing out through the lower radial oil outlet 15 flows into the spiral oil groove 22 and reaches the oil storage groove 231 on the top surface 23 of the main bearing upward along the spiral oil groove 22. The refrigeration oil flowing out through the upper radial oil outlet 16 flows directly into the oil storage groove 231 on the top surface 23 of the main bearing.

[0056] Working principle:

[0057] In the crankshaft-main bearing assembly described in Embodiment 1, during compressor operation, the oil suction plate 6 can overcome gravity to draw refrigerant oil from the bottom oil sump into the central oil passage 14, and then transport it to the oil storage tank 231 on the top surface 23 of the main bearing through the lower radial oil outlet 15 and the upper radial oil outlet 16. The refrigerant oil stored in the oil storage tank 231 flows back to the inner hole 21 of the main bearing to the maximum extent under the action of gravity through the oil guide groove 232. The inner hole 21 of the main bearing is provided with an oil storage structure 212 that communicates with the oil guide groove 232, which further ensures the oil film thickness between the main bearing 2 and the crankshaft 1 and reduces the amount of wear between them.

[0058] Example 2

[0059] The crankshaft-main bearing assembly provided in this embodiment 2 is basically the same in structure and principle as the crankshaft-main bearing assembly described in embodiment 1 above, except that:

[0060] As attached Figure 8 As shown, the inner side of the oil storage tank 231 is connected to the hole wall of the main bearing inner hole 21; that is, the height h1 of the inner wall 2311 of the oil tank is 0.

[0061] Example 3

[0062] This embodiment 3 provides a compressor pump body assembly, including a crankshaft-main bearing assembly, a secondary bearing, a cylinder, and a rotor; the crankshaft-main bearing assembly adopts the crankshaft-main bearing assembly described in embodiment 1 or 2; wherein, the main bearing is sealed on the upper end face of the cylinder, and the secondary bearing is sealed on the lower end face of the cylinder; the crankshaft is concentrically assembled in the working chamber of the cylinder; wherein, the long shaft portion of the crankshaft is inserted into the inner hole of the main bearing of the main bearing, and the short shaft portion of the crankshaft is inserted into the inner hole of the secondary bearing of the secondary bearing; the rotor is disposed in the working chamber of the cylinder and sleeved on the outside of the eccentric portion of the crankshaft.

[0063] Example 4

[0064] As attached Figure 9 As shown, this embodiment 4 provides a compressor, including a pump body assembly 100, a motor assembly 200, a housing 300 and a liquid receiver 400; wherein, the pump body assembly 100 adopts the compressor pump body assembly described in embodiment 3 above, and a bottom oil sump 5 is provided at the bottom of the housing 300.

[0065] When the compressor is running, the motor assembly 200 drives the core rotor 4, which is fitted into the eccentric part 12, to rotate eccentrically along the inner wall of the cylinder 7. The long shaft 12 of the crankshaft is fitted into the inner hole 21 of the main bearing, and the short shaft 11 is fitted into the inner hole of the auxiliary bearing 3. The main bearing 2 and the auxiliary bearing 3 are concentrically assembled to form the rotation center of the pump body assembly 100. At the same time, the main bearing 2 is connected to the compressor housing 300 by plug welding to support the pump body assembly structure of the compressor.

[0066] When the motor assembly 200 drives the crankshaft 1 to rotate eccentrically, the crankshaft 1 is subjected to eccentric inertial force, motor magnetic pull and gas force, causing bending deformation. Metal-to-metal contact friction easily occurs between the long shaft 1 of the crankshaft and the main bearing 2, resulting in abnormal wear between the long shaft 11 and the inner hole 21 of the main bearing.

[0067] In this embodiment 4, the central oil passage is set as a blind hole to increase oil pressure. The central oil passage is divided into two parts: the side near the short shaft is a mounting hole section that is interference-fitted with the oil suction section to fix the oil suction plate; the side away from the short shaft is a head hole that communicates with the radial oil outlet hole on the surface of the long shaft. When the compressor is running, the oil suction plate draws the refrigerant oil from the bottom oil sump 5 into the central oil passage. The refrigerant oil rises continuously in the central oil passage. When the oil level reaches the lower radial oil outlet hole, a portion of the refrigerant oil flows downwards along the lower radial direction. The oil flows into the spiral oil groove in the inner bore of the main bearing through the oil outlet; the remaining refrigeration oil continues to flow upwards to the upper radial oil outlet and into the oil reservoir on the top surface of the main bearing; the oil guide groove guides the refrigeration oil backflow to the oil storage structure in the inner bore of the main bearing, which increases the oil film strength of the upper end 211 of the inner bore of the main bearing and the long shaft portion 11; during compressor operation, especially during secondary startup or when the motor speed increases, it effectively reduces the wear between the long shaft portion 11 and the upper end 211 of the inner bore, and improves the reliability of the pump body assembly operation.

[0068] In this embodiment 4, the compressor is used in a refrigeration or heat pump system as a power component for refrigerant circulation. The compressor compresses the low-temperature, low-pressure gaseous refrigerant to form a high-temperature, high-pressure gaseous refrigerant, which then passes through the condenser to release heat, the throttling device to reduce pressure, and the evaporator to absorb heat before re-entering the compressor for the next refrigerant cycle.

[0069] Performance testing:

[0070] The compressor described in Example 4 was compared with an existing compressor under the same operating conditions. The test results showed that, under the same operating conditions, the cooling capacity increased and the power consumption decreased. Specifically, when running at a low frequency of 20 Hz, the coefficient of performance (COP) increased by about 0.2%; when running at a medium frequency of 60 Hz, the COP increased by about 0.8%; and when running at a high frequency of 110 Hz, the COP increased by 1.5%, with significant improvements in medium and high frequency performance.

[0071] The crankshaft-main bearing assembly, compressor pump body assembly, and compressor of this invention feature a blind oil passage in the crankshaft to increase oil pressure. The central oil passage is divided into two parts: a mounting hole near the short shaft that is interference-fitted with the oil suction plate for fixing it, and a head hole away from the short shaft that communicates with the radial oil outlet on the long shaft surface. When the compressor is running, the oil suction plate draws the refrigeration oil from the oil sump at the bottom of the housing into the oil passage. The refrigeration oil continuously rises in the oil passage, and when the oil level reaches the lower radial oil outlet located on the long shaft, a portion of it... The refrigeration oil flows into the spiral oil groove in the inner bore of the main bearing along the lower radial oil outlet; the remaining refrigeration oil continues upward to the upper radial oil outlet and flows into the oil reservoir on the top surface of the main bearing; the oil guide groove, which is radially connected to the oil reservoir on the top surface of the main bearing, guides the refrigeration oil to the oil storage structure in the inner bore of the main bearing. The oil storage structure increases the oil film strength at the upper end of the inner bore of the main bearing and the long shaft of the crankshaft; during compressor operation, especially during secondary startup or when the motor speed increases, it effectively reduces the wear of the long shaft of the crankshaft and the upper end of the inner bore of the main bearing, and improves the reliability of the pump assembly operation.

[0072] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A crankshaft-main bearing assembly, characterized in that, It includes a crankshaft (1) and a main bearing (2); the long shaft portion (11) of the crankshaft (1) is fitted into the main bearing inner hole (21) of the main bearing (2); a central oil passage hole (14) is provided at the axial center of the crankshaft (1); wherein the central oil passage hole (14) is a blind hole structure; The surface of the long shaft portion (11) is provided with an upper radial oil outlet hole (16). The first end of the upper radial oil outlet hole (16) communicates with the blind end of the central oil passage hole (14), and the second end of the upper radial oil outlet hole (16) communicates with the surface of the long shaft portion (11). The upper radial oil outlet hole (16) is located above the bearing top surface (23) of the main bearing (2). An oil reservoir (231) is provided on the top surface (23) of the bearing; wherein, the oil reservoir (231) is used to store the refrigeration oil flowing out through the upper radial oil outlet (16), and to overflow the stored refrigeration oil to the contact surface between the inner hole (21) of the main bearing and the long shaft portion (11); The central oil passage (14) includes an axially connected mounting hole section (141) and a head hole section (142). The mounting hole section (141) is provided on the side close to the short shaft portion (13) of the crankshaft (1), and an oil suction plate (6) is installed inside the mounting hole section (141); the head hole section (142) is provided on the side away from the short shaft portion (13), and the upper radial oil outlet hole (16) is located at the end of the head hole section (142); The distance m between the centerline of the upper radial oil outlet hole (16) and the top surface (23) of the main bearing satisfies: Ψ≥m≥1 / 2Ψ; where Ψ is the diameter of the upper radial oil outlet hole (16); The height h1 of the inner wall (2311) of the oil storage tank (231) is less than the height h2 of the outer wall (2312) of the oil storage tank (231); The diameter d1 of the inner wall (2311) of the oil groove satisfies: d1≥D1; where D1 is the diameter of the inner hole (21) of the main bearing; the diameter d2 of the outer wall (2312) of the oil groove satisfies: D2-1mm≥d2≥d1+1mm; where D2 is the outer diameter of the top surface (23) of the main bearing.

2. The crankshaft-main bearing assembly according to claim 1, characterized in that, The oil storage groove (231) is an annular open groove; wherein, the open end of the oil storage groove (231) is in communication with the upper top surface (23) of the bearing, and the bottom of the oil storage groove (231) extends along the center line of the inner hole (21) of the main bearing towards the lower bottom surface of the main bearing (2).

3. A crankshaft-main bearing assembly according to claim 1, characterized in that, The top surface (23) of the main bearing is also provided with a plurality of oil guide grooves (232); the plurality of oil guide grooves (232) are evenly distributed circumferentially around the axis of the inner hole (21) of the main bearing, one end of the oil guide groove (232) is connected to the hole wall of the inner hole (21) of the main bearing, and the other end of the oil guide groove (232) is connected to the oil storage groove (231).

4. A crankshaft-main bearing assembly according to claim 3, characterized in that, The inner wall of the main bearing (21) is provided with a spiral oil groove (22), and one of the oil guide grooves (232) is connected to the spiral oil groove (22).

5. A crankshaft-main bearing assembly according to claim 3, characterized in that, The inner wall of the main bearing (21) is also provided with a number of oil storage structures (212); wherein, the oil storage structure (212) is an open groove structure provided on the inner wall of the main bearing (21); the oil storage structure (212) is provided in correspondence with the oil guide groove (232) and is located below the oil guide groove (232).

6. A crankshaft-main bearing assembly according to claim 5, characterized in that, The width w of the oil storage structure (212) along the circumferential direction of the inner hole (21) of the main bearing satisfies: 1.5b≥w≥1.1b; the depth H of the oil storage structure (212) along the axial direction of the inner hole (21) of the main bearing satisfies: 2h2≥H≥h2; the depth f of the oil storage structure (212) along the radial direction of the inner hole (21) of the main bearing satisfies: 0.1mm≤f≤0.5mm; where b is the width of the oil guide groove (232) and h2 is the height of the outer wall (2312) of the oil groove.

7. A compressor pump body assembly, characterized in that, Includes the crankshaft-main bearing assembly as described in any one of claims 1-6.

8. A compressor, characterized in that, Includes a compressor pump assembly as described in claim 7.

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