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CN-224228743-U - Detachable oil-gas separator

CN224228743UCN 224228743 UCN224228743 UCN 224228743UCN-224228743-U

Abstract

The utility model discloses a detachable oil-gas separator, relates to a blowby gas treatment device of a crankcase of an internal combustion engine, and is suitable for a scene requiring periodic maintenance of a filter element rotor. The structure of the filter element comprises a shell assembly, an air inlet assembly, a filter element rotor assembly and a driving assembly, and rapid maintenance is realized through a modularized design. The driving component drives the impeller to rotate through the spray hole by utilizing high-pressure engine oil to drive the central shaft and the filter element rotor component to rotate at a high speed, and oil in blowby gas of the crankcase is separated by virtue of centrifugal force. And the separated gas is discharged from the gas outlet, and the oil returns to the crankcase through the oil return port. The filter element rotor component can be replaced only by disassembling the air inlet component, so that maintenance cost is reduced, constraint and double-bearing support of circumferential limit matched with the axial compression of the spring are adopted, high-speed rotation stability is improved, the conical structure assists assembly, and the sealing element ensures interface tightness. The problems of complex maintenance, easy rotor movement and the like of the traditional integral separator are solved, and the integral separator is suitable for passenger cars, commercial vehicles and engineering machinery engines.

Inventors

  • WANG FEIYUE
  • REN ZHIXUE
  • HU HAO

Assignees

  • 平原滤清器有限公司

Dates

Publication Date
20260512
Application Date
20250825

Claims (9)

  1. 1. The utility model provides a removable oil and gas separator, includes casing subassembly (32), air inlet (11) and gas outlet (321) of setting on casing subassembly (32), connect in base (36) of casing subassembly (32) bottom and set up oil return opening (361) on base (36), be equipped with filter core rotor subassembly (2) and drive unit in casing subassembly (32), drive unit is used for the drive filter core rotor subassembly (2) are rotatory in order to separate the fluid in the crankcase gas blow-by that gets into from air inlet (11), and the gas after the separation is discharged from gas outlet (321), and the fluid of separation is discharged from oil return opening (361), its characterized in that: The air inlet (11) and an upper bearing assembly (12) communicated with the air inlet (11) form an air inlet assembly (1); The filter element rotor assembly (2) has a filter layer (22); the driving assembly (3) comprises the base (36), the oil return port (361), the driving unit and a central shaft (31); The middle upper part of the central shaft (31) is detachably connected with the filter element rotor assembly (2) and is used for driving the filter element rotor assembly (2) to rotate, and the central shaft (31) is driven by a driving unit; The driving unit comprises an impeller (35) and a spray hole (37) for driving the impeller (35), wherein the impeller (35) is connected to the bottom of the central shaft (31); The air inlet assembly (1) is detachably arranged on the driving assembly (3) and the shell assembly (32), and an upper bearing assembly (12) of the air inlet assembly (1) is rotatably connected with the upper end of the central shaft (31).
  2. 2. The detachable oil-gas separator according to claim 1, wherein: A sealing element (13) is pressed between the air inlet assembly (1) and the top end of the shell assembly (32) to realize sealing.
  3. 3. The detachable oil-gas separator according to claim 2, characterized in that: The filter element rotor assembly (2) comprises an upper end cover (21), a lower end cover (23) and a filter layer (22) fixed between the upper end cover and the lower end cover, a central hole structure (211) is fixed at the center of the upper end cover (21), a central shaft (31) is inserted into the central hole structure (211), the radial section of the part of the central shaft (31) inserted into the central hole structure (211) is polygonal, and the central hole structure (211) is matched with the central shaft (31) and forms a connecting structure which is circumferentially limited and axially unconstrained.
  4. 4. A removable oil and gas separator as set forth in claim 3 wherein: The upper end surface of the hole wall of the central hole structure (211) is used as a supporting surface (212) of the upper end cover (21); The driving assembly (3) further comprises a spring (33), wherein the spring (33) supports the lower end cover (23) upwards and applies axial elastic force to the filter element rotor assembly (2) so that a supporting surface (212) of the upper end cover (21) is in contact with an upper bearing (121) of the upper bearing assembly (12).
  5. 5. The detachable oil-gas separator as claimed in claim 2, wherein the upper end of the central shaft (31) is a tapered structure (311) for guiding the assembly of the upper bearing assembly (12) with the central shaft (31).
  6. 6. The detachable oil-gas separator according to claim 2, characterized in that: The sealing element (13) is a radial seal or an axial seal.
  7. 7. The detachable oil-gas separator according to claim 2, characterized in that: The driving assembly (3) further comprises a lower bearing assembly (34), the lower bearing assembly (34) is provided with a lower bearing (341), the lower bearing (341) is arranged on the base (36), and the lower end of the central shaft (31) is rotationally connected with the lower bearing assembly (34).
  8. 8. The detachable oil-gas separator according to any one of claims 1 to 7, characterized in that: The jet hole (37) is arranged on the base (36) and is used for jetting engine oil onto the impeller (35) to drive the impeller (35) to rotate.
  9. 9. A removable oil and gas separator as set forth in claim 3 wherein: An oil throwing gap (231) is formed between the upper end cover (21) and the lower end cover (23), and separated oil is thrown to the inner wall of the shell assembly (32) through the oil throwing gap (231) under the action of centrifugal force.

Description

Detachable oil-gas separator Technical Field The utility model relates to a gas blowby treatment device of an internal combustion engine crankcase, in particular to a centrifugal filter element type oil-gas separator with a modularized detachable structure, which is particularly suitable for an application scene requiring periodic maintenance of a filter element rotor. Background The oil-gas separator is a core component of a crankcase ventilation system of an internal combustion engine, and has the main function of separating engine oil mist and impurities in crankcase blow-by gas, so as to prevent engine oil from entering a combustion chamber along with the gas to burn (causing carbon deposition and emission deterioration) or being directly discharged to the atmosphere (causing environmental pollution and engine oil loss). In the prior art, the centrifugal oil-gas separator is widely applied to passenger cars, commercial cars and engineering machinery engines due to the advantages of high separation efficiency, adaptation to high oil-gas concentration scenes and the like. The typical centrifugal oil-gas separator is generally composed of an air inlet channel, a filter element rotor assembly, a driving mechanism (such as an impeller and a motor) and a shell assembly, and the working principle of the centrifugal oil-gas separator is that crankcase blowby gas enters the separator through the air inlet channel, the driving mechanism drives a separation rotor (the filter element rotor assembly) to rotate at a high speed, engine oil mist drops in an oil-gas mixture are thrown to the inner wall of the shell assembly by utilizing centrifugal force, separated clean gas enters an air inlet manifold through an air outlet to participate in secondary combustion, and engine oil flows back to the crankcase along the inner wall. The core structure of the existing centrifugal oil-gas separator is of an integral integrated design, namely, an air inlet channel, a separating rotor, a driving mechanism and a shell component are fixed into an integral body which is not detachable through bolts or welding. This design has significant significance in the early stages of technological development: The structure is compact, the axial dimension of each part is shortened after the integration, and the device is suitable for the installation requirement of a small space of an engine cabin; the cost is controllable, assembly procedures (such as omitting a sealing piece between modules) are reduced, and the production cost and the material cost are reduced; the reliability is high, the number of the connecting interfaces is reduced, and the leakage risk under the vibration working condition is reduced. Despite the advantages of the monolithic structure, as the engine technology advances toward high power density and long life, the defects thereof are increasingly prominent, and the specific manifestations and causes are as follows: The maintenance procedure is complex, and the filter element replacement cost is high. When the filter element (filter layer) of the separation rotor is blocked or fails due to long-term use, the filter element can be taken out only by disassembling the whole separator (comprising an air inlet pipeline and a driving mechanism which are connected with the shell assembly), so that the maintenance working time is increased, and the sealing surface of the shell assembly can be damaged due to repeated disassembly. Correspondingly, this patent has designed the structure that only need dismantle air inlet subassembly can change filter core rotor subassembly. And (II) the filter element rotor is easy to axially move during high-speed rotation. The separating rotor (comprising the filter element) is fixed on the central shaft through a single limiting structure (such as upper end bolt pressing or lower end key connection), and when the rotor rotates at a high speed, axial movement is caused by vibration or assembly errors, so that the rotor and the shell assembly are caused to collide, abnormal sound and even break. Correspondingly, the patent creates a composite constraint route of circumferential limit and spring axial compression, and bidirectional dynamic stability is realized through the cooperation of an upper end cover center hole structure and a center shaft (circumferential limit) and the elastic compression (axial pre-compression) of a lower end cover spring. And thirdly, the impurity discharge depends on a special oil drain hole, and is easy to block. The impurities such as the engine oil after the separation, carbon particles and the like need to flow back to the crankcase through the special oil drain hole in the bottom of the shell component, the diameter of the oil drain hole is smaller, and the engine oil is easy to be blocked due to impurity deposition after long-term use, so that the engine oil can not flow back (accumulated in the shell component), and even is carried by clean gas for the second ti