An oil pump inner-outer rotor assembly with surface microstructure

Abstract

The utility model belongs to the rotor type oil pump technical field, concretely relates to a kind of oil pump inner and outer rotor assembly with surface microstructure.A kind of oil pump inner and outer rotor assembly with surface microstructure, including inner rotor and outer rotor, the inner rotor is located at the inboard of outer rotor, the inner rotor and outer rotor are eccentrically arranged, the inner rotor drives outer rotor to rotate in the same direction;The outer wall of the inner rotor is equipped with n rotor outer teeth, and the inner wall of the outer rotor is equipped with n+1 rotor inner grooves;It is the inner tooth surface of inward arc convex between the adjacent rotor inner groove, and the surface of the inner tooth surface is equipped with several recesses.

Description

Technical Field

[0001] This utility model belongs to the field of rotor oil pump technology, specifically relating to an inner and outer rotor assembly of an oil pump with surface microstructure. Background Technology

[0002] Rotary lobe pumps, a common and crucial type of positive displacement pump, are characterized by the meshing motion of their internal rotors. The working principle of a rotary lobe pump can be summarized into three basic processes: 1. Vacuum formation and oil suction: When the driving rotor (usually the inner rotor) rotates under the drive of a motor, it drives the driven rotor (usually the outer rotor) to rotate as well. As the rotors disengage, the inter-tooth volume increases, creating a partial vacuum. Under atmospheric pressure, oil is drawn into the pump body. 2. Closed-loop delivery: The sucked-in oil is enclosed within a sealed space formed by the tooth grooves of the two rotors and the pump casing. 3. Discharge by compression: As the rotors continue to rotate, the volume of the sealed space decreases, squeezing the oil out and discharging it from the outlet. This process repeats continuously, achieving continuous oil delivery.

[0003] Traditional inner and outer rotor assemblies experience frequent friction during operation. This friction generates wear debris. Over time, increased friction and wear debris contamination in the oil can occur, necessitating maintenance and replacement of the traditional inner and outer rotors, significantly reducing their lifespan.

[0004] To increase lubrication between the inner and outer rotors and effectively reduce friction between them, this invention aims to provide an oil pump inner and outer rotor assembly with surface microstructures. Utility Model Content

[0005] The purpose of this invention is to provide an inner and outer rotor assembly for an oil pump with surface microstructures to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An oil pump inner and outer rotor assembly with surface microstructure includes an inner rotor and an outer rotor. The inner rotor is located inside the outer rotor and the inner and outer rotors are eccentrically arranged. The inner rotor drives the outer rotor to rotate in the same direction. The outer wall of the inner rotor is provided with n rotor outer teeth, and the inner wall of the outer rotor is provided with n+1 rotor inner slots. The adjacent rotor inner slots are separated by an inwardly arc-shaped protruding inner tooth surface, and the surface of the inner tooth surface is provided with several recesses.

[0008] Preferably, the recesses on the surface of the internal tooth are grooves, which are micron-sized grooves, and the grooves are arranged in a longitudinal row or in a transverse array.

[0009] Preferably, the depressions provided on the surface of the internal tooth surface are pits, which are micron-sized pits, and a plurality of the pits are distributed in a rectangular array on the surface of the internal tooth surface.

[0010] Preferably, the outer wall of the inner rotor is provided with 6 rotor external teeth, and correspondingly, the inner wall of the outer rotor is provided with 7 rotor internal slots.

[0011] Preferably, the number of grooves on a single internal tooth surface is even; in a single internal tooth surface, a plurality of grooves are symmetrically arranged on both sides of the tooth tip surface.

[0012] Preferably, the number of grooves on a single internal tooth surface is four, and the four grooves are symmetrically arranged on both sides of the tooth tip surface of the internal tooth surface.

[0013] Preferably, in a single internal tooth surface, a plurality of recesses arranged in a rectangular array are symmetrically disposed on both sides of the tooth tip surface.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) The present invention provides an oil pump inner and outer rotor assembly with surface microstructure. The actual structure of the depression is a micron-level pit or groove. The pit can store a small amount of lubricating oil during operation, forming a continuous lubricating oil film and reducing dry friction.

[0016] (2) The present invention provides an oil pump inner and outer rotor assembly with surface microstructure, in which tiny particles generated by wear can fall into pits or grooves to prevent them from scratching the friction surface, i.e. chip-collecting effect.

[0017] (3) The oil pump inner and outer rotor assembly with surface microstructure provided by this utility model reduces the friction coefficient and wear rate between the inner and outer rotors under the combined action. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the inner rotor and outer rotor of this utility model.

[0019] Figure 2 This is a schematic diagram of the external rotor structure of Embodiment 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of the external rotor portion structure of Embodiment 1 of the present invention. Figure 1 ;

[0021] Figure 4 This is a schematic diagram of the external rotor portion structure of Embodiment 1 of the present invention. Figure 2 ;

[0022] Figure 5 This is a schematic diagram of the external rotor structure of Embodiment 2 of this utility model;

[0023] Figure 6 This is a schematic diagram of the external rotor portion structure of Embodiment 2 of the present invention. Figure 1 ;

[0024] Figure 7 This is a schematic diagram of the external rotor portion structure of Embodiment 2 of the present invention. Figure 2 ;

[0025] In the diagram: 1-Inner rotor; 2-Outer rotor; 3-Outer rotor teeth; 4-Inner rotor groove; 5-Inner tooth surface; 6-Groove; 7-Pit. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. It should be emphasized that the rotor oil pump is a mature oil pump structure. Therefore, in this specific embodiment, only the cooperation between the inner rotor and the outer rotor is described, and the rotor oil pump is not described in its entirety.

[0027] Example 1

[0028] An oil pump inner and outer rotor assembly with surface microstructures includes an inner rotor 1 and an outer rotor 2, with the inner rotor 1 located inside the outer rotor 2. The inner rotor 1 and outer rotor 2 are designed with a conventional eccentric position, and some of the outer rotor teeth 3 of the inner rotor 1 mesh with some of the inner rotor grooves 4 of the outer rotor 2. Rotation of the inner rotor 1 drives the outer rotor 2 to rotate in the same direction. The outer wall of the inner rotor 1 has six outer rotor teeth 3, and the inner wall of the outer rotor 2 has seven inner rotor grooves 4. Between adjacent inner rotor grooves 4 are inwardly arc-shaped protruding inner tooth surfaces 5, with four grooves 6 on the surface of the inner tooth surfaces 5. The grooves 6 can be produced using laser processing or etching processes. In a single inner tooth surface 5, the four grooves 6 are symmetrically arranged in pairs on both sides of the tooth tip surface. The grooves 6 are micrometer-level grooves with a depth of 50 micrometers, all grooves 6 are longitudinally aligned, and all grooves 6 are distributed in a transverse array.

[0029] During operation, the inner rotor 1 drives the outer rotor 2 to rotate. Lubricating oil enters the chamber between the inner rotor 1 and the outer rotor 2. The lubricating oil fills the groove 6, allowing some lubricating oil to be retained on the inner tooth surface 5 of the outer rotor 2. This reduces the coefficient of friction between the inner rotor 1 and the outer rotor 2, effectively reducing dry friction; at the same time, it collects the wear debris generated by friction into the groove 6, preventing further damage to the surfaces of the inner rotor 1 and the outer rotor 2.

[0030] Example 2

[0031] An oil pump inner and outer rotor assembly with surface microstructure includes an inner rotor 1 and an outer rotor 2, with the inner rotor 1 located inside the outer rotor 2. The inner rotor 1 and outer rotor 2 are conventionally eccentrically positioned, with some of the outer rotor teeth 3 of the inner rotor 1 meshing with some of the inner rotor grooves 4 of the outer rotor 2. Rotation of the inner rotor 1 drives the outer rotor 2 to rotate in the same direction. The outer wall of the inner rotor 1 has six outer rotor teeth 3, and the inner wall of the outer rotor 2 has seven inner rotor grooves 4. Between adjacent inner rotor grooves 4 is an inwardly arc-shaped protrusion of an inner tooth surface 5, with several pits 7 on the surface of the inner tooth surface 5. The pits 7 can be produced using laser processing or etching processes. In a single inner tooth surface 5, several pits 7 are distributed in a rectangular array on the surface of the inner tooth surface 5. The pits 7 are micrometer-sized, with a diameter of 50 micrometers and a depth of 50 micrometers. Several rectangularly arrayed pits 7 are symmetrically arranged on both sides of the tooth tip surface of the inner tooth surface 5.

[0032] During operation, the inner rotor 1 drives the outer rotor 2 to rotate. Lubricating oil enters the chamber between the inner rotor 1 and the outer rotor 2. The lubricating oil fills the groove 6, allowing some lubricating oil to be retained on the inner tooth surface 5 of the outer rotor 2. This reduces the coefficient of friction between the inner rotor 1 and the outer rotor 2, effectively reducing dry friction; at the same time, it collects the wear debris generated by friction into the groove 6, preventing further damage to the surfaces of the inner rotor 1 and the outer rotor 2.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An inner and outer rotor assembly for an oil pump with surface microstructures, characterized in that: It includes an inner rotor and an outer rotor. The inner rotor is located inside the outer rotor and the inner rotor and the outer rotor are eccentrically arranged. The inner rotor drives the outer rotor to rotate in the same direction. The outer wall of the inner rotor is provided with n rotor external teeth, and the inner wall of the outer rotor is provided with n+1 rotor internal slots. The adjacent rotor internal slots are separated by an inwardly arc-shaped protruding internal tooth surface, and the surface of the internal tooth surface is provided with several recesses.

2. The oil pump inner and outer rotor assembly with surface microstructure according to claim 1, characterized in that: The recesses on the surface of the internal tooth are grooves, which are micron-sized grooves. Several grooves are arranged in a longitudinal row, and several grooves are distributed in a transverse array.

3. The oil pump inner and outer rotor assembly with surface microstructure according to claim 1, characterized in that: The depressions provided on the surface of the internal tooth surface are pits, which are micron-sized pits, and a number of the pits are distributed in a rectangular array on the surface of the internal tooth surface.

4. The inner and outer rotor assembly of an oil pump with surface microstructure according to claim 1, characterized in that: The outer wall of the inner rotor has 6 external rotor teeth, and correspondingly, the inner wall of the outer rotor has 7 internal rotor slots.

5. The oil pump inner and outer rotor assembly with surface microstructure according to claim 2, characterized in that: The number of grooves on a single internal tooth surface is even; in a single internal tooth surface, several grooves are symmetrically arranged on both sides of the tooth tip surface.

6. The inner and outer rotor assembly of an oil pump with surface microstructure according to claim 5, characterized in that: The number of grooves on a single internal tooth surface is 4, and the 4 grooves are symmetrically arranged on both sides of the tooth tip surface of the internal tooth surface.

7. The inner and outer rotor assembly of an oil pump with surface microstructure according to claim 3, characterized in that: In a single internal tooth surface, a number of pits arranged in a rectangular array are symmetrically disposed on both sides of the tooth tip surface.

Images