Search

CN-116877585-B - Crankshaft-main bearing assembly, compressor pump body assembly and compressor

CN116877585BCN 116877585 BCN116877585 BCN 116877585BCN-116877585-B

Abstract

The invention discloses a crankshaft-main bearing assembly, a compressor pump body assembly and a compressor, which comprise a crankshaft and a main bearing, wherein a long shaft part of the crankshaft is matched and sleeved in a main bearing inner hole of the main bearing, a central oil through hole is formed in the axial center of the crankshaft, the central oil through hole is of a blind hole structure, an upper radial oil outlet is formed in the surface of the long shaft part, a first end of the upper radial oil outlet is communicated with a blind end of the central oil through hole, a second end of the upper radial oil outlet is communicated with the surface of the long shaft part, the upper radial oil outlet is positioned above the upper top surface of the main bearing, an oil storage groove is formed in the upper top surface of the main bearing, and is used for storing refrigerating machine oil flowing out through the upper radial oil outlet and overflowing the stored refrigerating machine oil to a contact surface of the main bearing inner hole and the long shaft part.

Inventors

  • ZHANG RONG
  • SUN MIN
  • LI LONGKAI

Assignees

  • 西安庆安制冷设备股份有限公司

Dates

Publication Date
20260512
Application Date
20230728

Claims (8)

  1. 1. The crankshaft-main bearing assembly is characterized by comprising a crankshaft (1) and a main bearing (2), wherein a long shaft part (11) of the crankshaft (1) is matched and sleeved in a main bearing inner hole (21) of the main bearing (2), and a central oil through hole (14) is formed in the axial center of the crankshaft (1), wherein the central oil through hole (14) is of a blind hole structure; The surface of the long shaft part (11) is provided with an upper radial oil outlet (16), a first end of the upper radial oil outlet (16) is communicated with a blind end of the central oil through hole (14), and a second end of the upper radial oil outlet (16) is communicated with the surface of the long shaft part (11), wherein the upper radial oil outlet (16) is positioned above a bearing upper top surface (23) of the main bearing (2); An oil storage tank (231) is arranged on the upper top surface (23) of the bearing, wherein the oil storage tank (231) is used for storing the refrigerating machine oil flowing out through the upper radial oil outlet (16) and overflowing the stored refrigerating machine oil to the contact surface of the inner hole (21) of the main bearing and the long shaft part (11); the central oil through hole (14) comprises an installation hole section (141) and a lift hole section (142) which are axially communicated; The mounting hole section (141) is arranged close to one side of a short shaft part (13) of the crankshaft (1), an oil absorption sheet (6) is assembled in the mounting hole section (141), the lift hole section (142) is arranged far away from one side of the short shaft part (13), and the upper radial oil outlet (16) is positioned at the tail end of the lift hole section (142); The distance m between the central line of the upper radial oil outlet hole (16) and the upper top surface (23) of the main bearing is more than or equal to m and more than or equal to 1/2 psi, wherein psi 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 smaller 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 is equal to or larger than D1, D1 is the diameter of an inner hole (21) of the main bearing, the diameter D2 of the outer wall (2312) of the oil groove is equal to or larger than D2-1mm and equal to or larger than d1+1mm, and D2 is the outer diameter of the upper top surface (23) of the main bearing.
  2. 2. The crankshaft-main bearing assembly according to claim 1, wherein the oil storage tank (231) is an annular open groove, wherein the open end of the oil storage tank (231) is communicated with the upper top surface (23) of the bearing, and the bottom of the oil storage tank (231) extends towards the lower bottom surface of the bearing of the main bearing (2) along the central line of the inner hole (21) of the main bearing.
  3. 3. The crankshaft-main bearing assembly according to claim 1, wherein a plurality of oil guide grooves (232) are further formed in the upper top surface (23) of the main bearing, the plurality of oil guide grooves (232) are uniformly distributed circumferentially along the axis of the main bearing inner hole (21), one end of each oil guide groove (232) is communicated with the hole wall of the main bearing inner hole (21), and the other end of each oil guide groove (232) is communicated with the oil storage groove (231).
  4. 4. A crankshaft-main bearing assembly according to claim 3, characterized in that a spiral oil groove (22) is provided in the wall of the main bearing bore (21), and in that one of the oil guiding grooves (232) communicates with the spiral oil groove (22).
  5. 5. A crankshaft-main bearing assembly according to claim 3, wherein a plurality of oil storage structures (212) are further arranged on the hole wall of the main bearing inner hole (21), the oil storage structures (212) are open groove structures arranged on the hole wall of the main bearing inner hole (21), and the oil storage structures (212) are arranged in one-to-one correspondence with the oil guide grooves (232) and are located below the oil guide grooves (232).
  6. 6. The crankshaft-main bearing assembly according to claim 5, wherein the width w of the oil storage structure (212) along the circumferential direction of the main bearing inner hole (21) is equal to or greater than 1.5b, the depth H of the oil storage structure (212) along the axial direction of the main bearing inner hole (21) is equal to or greater than 2H2 and greater than or equal to H2, the depth f of the oil storage structure (212) along the radial direction of the main bearing inner hole (21) is equal to or less than 0.1mm and less than or equal to 0.5mm, b is the width of the oil guiding groove (232), and H2 is the height of the outer wall (2312) of the oil groove.
  7. 7. A compressor pump body assembly comprising a crankshaft-main bearing assembly according to any one of claims 1-6.
  8. 8. A compressor comprising a compressor pump assembly according to claim 7.

Description

Crankshaft-main bearing assembly, compressor pump body assembly and compressor Technical Field The invention belongs to the technical field of compressors, and particularly relates to a crankshaft-main bearing assembly, a compressor pump body assembly and a compressor. Background At present, along with the development of compressor technology, in order to meet the requirement of high efficiency of a compressor, the shaft diameters of a long shaft part and a short shaft part of a crankshaft are smaller and smaller, so that the rigidity of the crankshaft is reduced, the deformation resistance is reduced, and when the compressor is started or the rotation speed of a motor is increased, the phenomenon of insufficient thickness of an oil film between the long shaft part and the upper end part of an inner hole of a main bearing occurs due to the increase of the running inertia force and the inertia moment of the compressor, so that the abrasion of the main bearing and a long shaft is increased, the friction temperature of the part is rapidly increased under severe conditions, material adhesion is generated, and a pump body component is invalid. Disclosure of Invention Aiming at the technical problems in the prior art, the invention provides a crankshaft-main bearing assembly, a compressor pump body assembly and a compressor, which are used for solving the technical problem of insufficient oil film thickness between a long shaft part and the upper end part of an inner hole of a main bearing. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a crankshaft-main bearing assembly, which comprises a crankshaft and a main bearing, wherein a long shaft part of the crankshaft is matched and sleeved in an inner hole of the main bearing, and a central oil through hole is formed in the axial center of the crankshaft; The surface of the long shaft part is provided with an upper radial oil outlet, the first end of the upper radial oil outlet is communicated with the blind end of the central oil through hole, and the second end of the upper radial oil outlet is communicated with the surface of the long shaft part; The upper top surface of the bearing is provided with an oil storage tank, wherein the oil storage tank is used for storing the refrigerating machine oil flowing out through the upper radial oil outlet and overflowing the stored refrigerating machine oil to the contact surface of the inner hole of the main bearing and the long shaft part. Further, the central oil through hole comprises an installation hole section and a lift hole section which are axially communicated; The mounting hole Duan Kaojin is arranged on one side of the short shaft part of the crankshaft, and an oil absorption sheet is assembled in the mounting hole section; The distance m between the central line of the upper radial oil outlet and the upper top surface of the main bearing meets the condition that ψ is larger than or equal to m and larger than or equal to 1/2 ψ, wherein ψ is the diameter of the upper radial oil outlet. The oil storage tank is an annular open groove, wherein the open end of the oil storage tank is communicated with the upper top surface of the bearing, and the bottom of the oil storage tank extends towards the lower bottom surface of the bearing of the main bearing along the central line of the inner hole of the main bearing. Further, the height h1 of the inner wall of the oil groove of the oil storage groove is smaller than the height h2 of the outer wall of the oil groove of the oil storage groove; The diameter D1 of the inner wall of the oil groove is more than or equal to D1, wherein D1 is the diameter of an inner hole of the main bearing, the diameter D2 of the outer wall of the oil groove is more than or equal to D2-1mm and more than or equal to d1+1mm, and D2 is the outer diameter of the upper top surface of the main bearing. Furthermore, the upper top surface of the main bearing is also provided with a plurality of oil guide grooves, the oil guide grooves are uniformly distributed along the circumferential direction of the center of the axis of the inner hole of the main bearing, one end of each oil guide groove is communicated with the hole wall of the inner hole of the main bearing, and the other end of each oil guide groove is communicated with the oil storage groove. Further, a spiral oil groove is formed in the hole wall of the main bearing inner hole, and one oil guide groove is communicated with the spiral oil groove. Furthermore, a plurality of oil storage structures are arranged on the hole wall of the main bearing inner hole, wherein the oil storage structures are open groove structures arranged on the hole wall of the main bearing inner hole, and the oil storage structures are arranged in one-to-one correspondence with the oil guide grooves and are positioned below the oil guide grooves. Further, the width w of the oil storage structure along th