A lubricating oil blending system and blending method

Abstract

A lubricating oil blending system and method includes a tank and a vertically arranged stirring shaft inside it. The tank has an inlet at the top and an outlet with a switch valve at the bottom. The stirring shaft is hollow, and a drive motor located outside the tank is connected to the upper end of the stirring shaft. A double-helix stirring blade assembly is mounted on the stirring shaft, connected to the stirring shaft via multiple hollow connecting pipes. The upper end of the stirring shaft is closed, and an air supply box is fitted and rotatably connected to it on the outer side of the upper part of the stirring shaft. An air inlet communicating with the air supply box is located at the upper part of the stirring shaft. The double-helix stirring blade assembly includes two first helical blades. The spiral air outlet pipe of this invention is adapted to and rotates synchronously with the double-helix stirring blade assembly, allowing gas to be evenly released from the first air outlet below and diffused into the upper and middle regions of the tank. The airflow disturbance combined with the mechanical shearing action of the blades effectively breaks up high-viscosity additive agglomerates, promoting the initial mixing of the base oil and additives.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil blending technology, specifically to a lubricating oil blending system and blending method. Background Technology

[0002] Current lubricating oil blending processes mainly rely on vertical mixing tanks. The tank contains a vertically arranged main stirring shaft, which is driven to rotate by a drive motor on the top of the tank. The existing stirring methods are relatively simple, mostly relying on the rotating stirring blades mounted on the upper end of the stirring shaft for stirring. The rotation of the upper stirring blades causes the material in the upper part of the tank to move in a circular motion, thereby driving the overall material mixing. Some processes will add a pulse stirring device to assist stirring. The core function of pulse stirring is to improve the local mixing effect by generating intermittent fluid disturbance through the pulse device.

[0003] However, in the existing technology, the stirring blades and pulse stirring work independently. The upper stirring blades and pulse stirring do not work together. The pulse disturbance cannot be coordinated with the rotational motion of the stirring blades to achieve uniform stirring throughout the entire tank, and dead zones still exist. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention provides a lubricating oil blending system and blending method.

[0005] The technical solution of this invention is as follows: A lubricating oil blending system includes a tank and a vertically arranged stirring shaft therein. The tank has an inlet at the top and an outlet with a switch valve at the bottom. The stirring shaft is a hollow shaft, and a drive motor located outside the tank is connected to the upper end of the stirring shaft. The stirring shaft is equipped with a double helical stirring blade assembly, which is connected to the stirring shaft through multiple hollow connecting pipes. The connecting pipes are inclined, and their upper parts are connected to the stirring shaft. A first one-way valve is provided at the connection point between the upper inner side of the connecting pipe and the stirring shaft. The upper end of the stirring shaft is a closed end. An air supply box is fitted on the outer side of the upper part of the stirring shaft and is sealed and rotatably connected to it. An air inlet connected to the air supply box is provided on the upper part of the stirring shaft. The air supply box is connected to an external air supply device through an air supply pipe. The double-helix stirring blade assembly includes two first helical blades arranged coaxially with opposite helical directions. A matching helical vent pipe is installed on the lower surface of the first helical blade along its helical direction. The helical vent pipe is connected to the lower part of the adjacent connecting pipe. Multiple first vent holes are opened below the helical vent pipe along its length. The inner diameter of the helical vent pipe is less than 1 / 2 of the blade width of the first helical blade. The lower ends of the two first helical blades are connected to the lower part of the stirring shaft through a support frame. The lower part of the tank is a conical structure, and a variable diameter spiral tube is installed on its inner wall along its surface. The variable diameter spiral tube is spaced apart from the lower inner wall of the tank through a mounting seat. Multiple second air outlets are opened along the length of the lower part of the variable diameter spiral tube. The lower opening of the variable diameter spiral tube is a closed opening. Its upper end passes through the tank and is connected to the external air supply equipment. A second one-way valve is installed inside the upper part of the variable diameter spiral tube near the air supply equipment.

[0006] Preferably, the stirring shaft is further provided with a second helical blade along its length direction. The second helical blade is arranged around the stirring shaft and is located inside the helical space enclosed by the two first helical blades.

[0007] Preferably, the maximum outer diameter of the variable diameter spiral tube is smaller than the maximum outer diameter of the spiral outlet tube.

[0008] The support frame is located above the variable diameter spiral tube and includes bubble breaking rods symmetrically arranged on both sides of the stirring shaft. The outermost radial end of the bubble breaking rod is located outside the variable diameter spiral tube.

[0009] The installation structure at the lower end of the stirring shaft is as follows: the lower end of the stirring shaft is connected to the lower part of the tank through a bearing seat. The stirring shaft and the bearing seat are rotatably connected. The bearing seat is located inside the space enclosed by the variable diameter spiral tube and is higher than the discharge port in the axial direction.

[0010] To improve blending efficiency and reduce dead zones, multiple third vent holes are provided at the bottom of the connecting pipe along its length.

[0011] The connecting pipe has the following structure: it includes an integrally formed support straight pipe and a connecting straight pipe. One end of the connecting straight pipe is connected to the stirring shaft, and the support straight pipe is connected to the lower surface of the first spiral blade.

[0012] Preferably, the gas supplied by the gas supply equipment is divided into two independent flow channels, including a first gas and a second gas. The first gas flows sequentially through the gas supply box, the air inlet, the hollow cavity of the stirring shaft, the first one-way valve, and the connecting pipe, and is finally released from the first and / or the third air outlet on the spiral air outlet pipe. The second gas flows through the variable diameter spiral pipe and the second one-way valve, and is released from the second air outlet on it.

[0013] Furthermore, the air intake has a conical structure, and the outer opening is larger than the inner opening.

[0014] A blending method for a lubricating oil blending system, comprising the following steps: S1, Feeding Add the base oil and functional additives into the tank through the inlet at the top of the tank until the preset liquid level is reached. S2, Pre-ventilation and pressure building When the external air supply equipment is started, the compressed air is divided into two streams and enters the system. The first stream of air enters the hollow connecting pipe and the spiral outlet pipe through the air supply box, the hollow stirring shaft, and the first one-way valve. The second stream of air enters the variable diameter spiral pipe and opens the second one-way valve, so that a stable positive pressure is formed inside each air pipe to prevent lubricating oil backflow. S3, Start stirring Turn on the drive motor, which drives the hollow stirring shaft, the double helix stirring blade assembly, and the support frame to rotate synchronously; S4, gas-liquid synergistic blending The rotating double helix stirring blade assembly mechanically shears and convects the material inside the tank. The airflow is discharged upward from the first vent, the second vent, and the third vent, forming a turbulent airflow. The bubble breaking rod cuts and refines the rising bubbles. S5, Discharge and Oil Discharge After mixing, open the discharge port at the bottom of the tank to drain all the mixed lubricating oil from the tank. S6, Pipeline purging and anti-clogging After the lubricating oil is completely drained, the external air supply equipment is kept in operation for a preset time. The airflow is used to purge the connecting pipe, spiral air outlet pipe and reducing spiral pipe to remove residual lubricating oil from the pipes. S7, Sequential shutdown The drive motor and external air supply equipment are turned off in sequence to complete the lubricating oil mixing process.

[0015] The beneficial effects of this invention are as follows: The spiral vent pipe is adapted to and rotates synchronously with the double spiral agitator blade assembly. It can move together with the two first spiral blades rotating in opposite directions, so that the gas is evenly released from the first vent hole below and diffused into the upper and middle areas of the tank. The airflow disturbance and the mechanical shearing action of the blades work together to effectively break up high-viscosity additive agglomerates and promote the initial mixing of base oil and additives. The variable diameter spiral pipe is arranged close to the conical inner wall of the lower part of the tank. The airflow it releases rises along the conical surface, covering a large area of ​​the bottom of the tank where materials are easily accumulated and dead corners are easily formed. The airflow from the spiral vent pipe works in conjunction with the airflow from the upper and lower parts of the tank to reduce the phenomenon of material residue at the bottom of the tank and uneven mixing. The second spiral blade is arranged around the stirring shaft and between the two first spiral blades. It can specifically stir the material around the stirring shaft, fill the dead corners of the shaft side, and further improve the material convection effect. The air inlet adopts a conical structure with an external opening larger than the internal opening, which can effectively reduce the resistance of gas entering the hollow cavity of the stirring shaft. This allows the gas in the air supply box to enter the stirring shaft smoothly and quickly, reducing airflow loss and ensuring stable ventilation pressure. At the same time, the conical structure can guide the flow, preventing gas from stagnating or flowing back at the air inlet. The design with a large external opening and a small internal opening can prevent lubricating oil in the tank from flowing back into the air supply box due to negative pressure or shaking. This further assists the first one-way valve in achieving backflow prevention protection, improving the stability and reliability of the ventilation system. Attached Figure Description

[0016] In the attached diagram: Figure 1 This is a structural diagram; Figure 2 This is a schematic diagram of a partial sectional view of the structure; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the internal structure before the second helical blade is installed. Figure 5 for Figure 4 Enlarged structural diagram at point B; Figure 6 A schematic diagram showing the installation positions of the spiral outlet pipe, connecting pipe, and variable diameter spiral pipe; Figure 7 A schematic diagram of the internal structure for installing the second helical blade; Figure 8 This is a schematic diagram of the connecting pipe structure in Example 3; Figure 9 A rendered perspective view of a lubricating oil blending system; The components represented by the various reference numerals in the diagram are: 1. Tank body; 101. Inlet; 102. Outlet; 2. Stirring shaft; 201. Air inlet; 3. Drive motor; 4. First spiral blade; 5. Connecting pipe; 501. Straight pipe; 502. Connecting straight pipe; 503. Third air outlet; 6. First one-way valve; 7. Air supply box; 8. Bearing; 9. Sealing sleeve; 10. Spiral air outlet pipe; 1001. First air outlet; 11. Support frame; 1101. Bubble breaking rod; 12. Variable diameter spiral pipe; 1201. Second air outlet; 13. Mounting base; 14. Second spiral blade; 15. Bearing seat; 16. Air supply pipe. Detailed Implementation

[0017] Example 1 See Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a lubricating oil blending system includes a tank 1 and a vertically arranged stirring shaft 2 inside it. The tank 1 has an inlet 101 at the top and an outlet 102 with a switch valve at the bottom. The stirring shaft 2 is a hollow shaft. The upper end of the stirring shaft 2 is connected to a drive motor 3 located outside the tank 1. The stirring shaft 2 is equipped with a double helical stirring blade assembly, which is connected to the stirring shaft 2 through multiple hollow connecting pipes 5. The connecting pipes 5 are inclined and their upper parts are connected to the stirring shaft 2. A first one-way valve 6 is provided at the connection point between the upper inner side of the connecting pipe 5 and the stirring shaft 2.

[0018] See Figure 3 As shown, the upper end of the stirring shaft 2 is a closed end. An air supply box 7, sealed and rotatably connected to the outer side of the upper part of the stirring shaft 2, is fitted onto its outer side. An air inlet 201, connected to the air supply box 7, is located on the upper part of the stirring shaft 2. The air inlet 201 has a conical structure, with the outer opening larger than the inner opening. The air supply box 7 is connected to an external air supply device via an air supply pipe 16. The stirring shaft 2 is a hollow shaft. Combined with the air supply box 7 and air inlet 201 on the outer side of the upper part of the stirring shaft 2, this allows for a stable flow of external gas into the stirring shaft 2. The air supply box 7 is sealed and rotatably connected to the stirring shaft 2, ensuring that the rotation of the stirring shaft 2 does not affect the air supply and reducing gas leakage. The connecting pipe 5 is hollow and inclined, with its upper part connected to the stirring shaft 2 and equipped with a first one-way valve 6. This allows for smooth gas delivery from the stirring shaft 2 to the spiral outlet pipe 10, and effectively prevents lubricating oil from flowing back into the stirring shaft 2, reducing the risk of clogging the ventilation channel and damaging the equipment.

[0019] The air supply box 7 is a hollow circular structure. Inside the air supply box 7 is a bearing 8. The outer ring of the bearing 8 is sealed and fixedly connected to the air supply box 7. The air supply box 7 is rotatably connected to the upper part of the stirring shaft 2 via the bearing 8. The inner ring of the bearing 8 is fitted onto the upper part of the stirring shaft 2 and fixedly connected thereto. The bearing 8 is located below the closed end. The air supply box 7 is fitted onto the upper part of the stirring shaft 2. The upper and lower parts of the air supply box 7 are sealed at their connections to the stirring shaft 2 without affecting the rotation of the stirring shaft 2. Support legs are provided at the bottom of the air supply box 7, connecting to the upper part of the tank body 1 to maintain the position of the air supply box 7. The sealing connection between the air supply box 7 and the stirring shaft 2 can be achieved by having relatively flexible sealing sleeves 9 fitted onto the outside of the stirring shaft 2 at both the upper and lower parts of the air supply box 7. The sealing sleeves 9 are fixedly connected to the air supply box 7, achieving a seal and reducing the leakage of compressed air from the air supply box 7.

[0020] See Figure 3As shown, the air inlet 201 in this embodiment adopts a conical structure with an external opening larger than the internal opening. This effectively reduces the resistance of gas entering the hollow cavity of the stirring shaft 2, allowing the gas in the air supply box 7 to enter the stirring shaft 2 smoothly and quickly, reducing airflow loss and ensuring stable ventilation pressure. At the same time, the conical structure can guide the flow, preventing gas from stagnating or flowing back at the air inlet 201. The design of a large external opening and a small internal opening can prevent lubricating oil in the tank from flowing back into the air supply box 7 due to negative pressure or shaking, further assisting the first one-way valve 6 in achieving backflow prevention protection and improving the stability and reliability of the ventilation system.

[0021] See Figure 6 As shown, the double-helix stirring blade assembly includes two first helical blades 4 arranged coaxially with opposite helical directions. A matching helical vent pipe 10 is installed on the lower surface of each first helical blade 4 along its helical direction. The helical vent pipe 10 is connected to the lower part of an adjacent connecting pipe 5. Multiple first vent holes 1001 are formed along the length of the helical vent pipe 10. The inner diameter of the helical vent pipe 10 is less than half the width of the first helical blade 4. The lower ends of the two first helical blades 4 are connected to the lower part of the stirring shaft 2 via a support frame 11. The double-helix stirring blade assembly uses two first helical blades 4 with opposite helical directions. When rotating, they can drive the material in the tank to form opposing convection currents, breaking the stable vortex of the material and improving the uniformity of mixing. The helical vent pipe 10 is matched with the first helical blades 4 and its inner diameter is less than half the width of the blades, which does not affect the stirring action of the blades and allows gas to be released evenly from the first vent holes 1001, achieving a synergy between airflow disturbance and mechanical stirring.

[0022] See Figure 5 As shown, the lower part of the tank body 1 has a conical structure, and a variable diameter spiral tube 12 is installed on its inner wall along its surface. The variable diameter spiral tube 12 is spaced apart from the lower inner wall of the tank body 1 through the mounting seat 13. Multiple second air outlets 1201 are opened at the lower part of the variable diameter spiral tube 12 along its length direction. The lower opening of the variable diameter spiral tube 12 is a closed opening. Its upper end passes through the tank body 1 and is connected to the external air supply equipment. A second one-way valve is provided inside the upper part of the variable diameter spiral tube 12 near the air supply equipment. The second one-way valve is located on the outside of the tank body 1 and is existing technology, so it is not shown in the figure.

[0023] In this embodiment, the variable diameter spiral tube 12 has a second vent 1201, which allows the gas to rise evenly along the conical inner wall of the tank 1, covering the area at the bottom of the tank where dead corners are easily formed. The second one-way valve further prevents lubricating oil from flowing back into the variable diameter spiral tube 12, and works with the first one-way valve 6 to achieve double anti-backflow protection, ensuring that the ventilation channel is unobstructed for a long time. At the same time, the variable diameter structure is adapted to the conical contour of the tank 1, maximizing the ventilation coverage area.

[0024] The maximum outer diameter of the variable diameter spiral tube 12 is smaller than the maximum outer diameter of the spiral outlet tube 10. The spiral outlet tube 10 has a larger maximum outer diameter, which can cover the upper and middle areas of the tank for aeration and stirring. The variable diameter spiral tube 12 has a smaller maximum outer diameter, which is adapted to the lower conical structure of the tank body 1 and covers the bottom area of ​​the tank. The two work together to achieve a larger range of aeration coverage inside the tank from top to bottom.

[0025] The support frame 11 is located above the variable diameter spiral tube 12. The support frame 11 includes bubble breaking rods 1101 symmetrically arranged on both sides of the stirring shaft 2. The outermost radial end of the bubble breaking rods 1101 is located outside the variable diameter spiral tube 12.

[0026] The installation structure at the lower end of the stirring shaft 2 is as follows: the lower end of the stirring shaft 2 is connected to the lower part of the tank body 1 through the bearing seat 15. The stirring shaft 2 is rotatably connected to the bearing seat 15. The bearing seat 15 is located inside the space enclosed by the variable diameter spiral tube 12 and is higher than the discharge port 102 in the axial direction.

[0027] The gas supplied by the gas supply equipment is divided into two independent flow channels, including a first gas channel and a second gas channel. The first gas channel flows sequentially through the gas supply box 7, the air inlet 201, the hollow cavity of the stirring shaft 2, the first one-way valve 6, and the connecting pipe 5, and is finally released from the first air outlet 1001 and / or the third air outlet 503 on the spiral air outlet pipe 10. The second gas channel flows through the variable diameter spiral pipe 12 and the second one-way valve, and is released from the second air outlet 1201 on it. The first gas channel covers the upper and middle area inside the tank, and the second gas channel covers the conical area at the bottom of the tank. The two airflows work together to achieve ventilation and disturbance throughout the entire tank without dead zones. Combined with the mechanical stirring of the double spiral stirring blade assembly, the gas-liquid synergistic mixing effect is maximized. At the same time, the two independent flow channels can avoid the problems of uneven airflow distribution and excessive pressure loss when using a single air channel, ensuring stable airflow at each vent. In addition, if one flow channel fails, the other can temporarily continue to work, improving the reliability of the equipment operation.

[0028] A blending method for a lubricating oil blending system, comprising the following steps: S1, Feeding The base oil and functional additives are added into the tank 1 through the feed inlet 101 at the top of the tank 1 until the preset liquid level is reached; S2, Pre-ventilation and pressure building When the external air supply equipment is started, the compressed air is divided into two paths and enters the system. The first path of air enters the hollow connecting pipe and the spiral air outlet pipe 10 through the air supply box 7, the hollow stirring shaft 2, and the first one-way valve 6. The second path of air enters the variable diameter spiral pipe 12 and opens the second one-way valve, so that a stable positive pressure is formed inside each air passage to prevent lubricating oil backflow. S3, Start stirring Turn on the drive motor 3, which drives the hollow stirring shaft 2, the double helix stirring blade assembly, and the support frame 11 to rotate synchronously; S4, gas-liquid synergistic blending The rotating double-helix stirring blade assembly mechanically shears and convects the material in the tank. The airflow is discharged upward from the first vent and the second vent, forming a turbulent airflow. The bubble breaking rod 1101 cuts and refines the rising bubbles. S5, Discharge and Oil Discharge After mixing, open the discharge port 102 at the bottom of tank 1 to discharge all the mixed lubricating oil in the tank. S6, Pipeline purging and anti-clogging After the lubricating oil is completely drained, the external air supply equipment is kept in continuous ventilation for a preset time. The airflow is used to purge the connecting pipe, spiral air outlet pipe 10 and variable diameter spiral pipe 12 to remove residual lubricating oil from the pipeline. S7, Sequential shutdown Turn off drive motor 3 and external air supply equipment in sequence to complete the lubricating oil mixing process.

[0029] Example 2 See Figure 7 As shown, Embodiment 2 is an improvement on Embodiment 1. The difference lies in that the stirring shaft 2 in Embodiment 2 is further provided with a second helical blade 14 along its length. The second helical blade 14 is arranged around the stirring shaft 2 and located within the helical space formed by the two first helical blades 4. The second helical blade 14, arranged around the stirring shaft 2 and located within the helical space of the two first helical blades 4, can specifically agitate the material around the stirring shaft 2. The second helical blade 14 cooperates with the first helical blades 4; the inner second helical blade 14 agitates the material on the shaft side, while the outer first helical blades 4 agitate the material in the upper and middle parts of the tank, improving the overall convection effect of the material in the tank and further enhancing the uniformity of the lubricating oil mixing.

[0030] Example 3 See Figure 8 As shown, Embodiment 3 is an improvement on Embodiment 1. The difference from Embodiment 1 is that, to improve mixing efficiency and reduce dead zones, Embodiment 3 includes multiple third air outlets 503 along its length at the lower part of the connecting pipe 5. The connecting pipe 5 comprises an integrally formed support straight pipe 501 and a connecting straight pipe 502. One end of the connecting straight pipe 502 is connected to the stirring shaft 2, and the support straight pipe 501 is connected to the lower surface of the first spiral blade 4. The support straight pipe 501 fits snugly against the lower surface of the first spiral blade 4, providing stable support for the spiral air outlet pipe 10 and also reinforcing the first spiral blade 4, preventing deformation due to centrifugal force during blade rotation.

Claims

1. A lubricating oil blending system, comprising a tank (1) and a vertically arranged stirring shaft (2) therein, wherein the tank (1) has an inlet (101) at the top and an outlet (102) with a switch valve at the bottom, characterized in that, The stirring shaft (2) is a hollow shaft. The upper end of the stirring shaft (2) is connected to a drive motor (3) located outside the tank (1). The stirring shaft (2) is equipped with a double spiral stirring blade assembly. The double spiral stirring blade assembly is connected to the stirring shaft (2) through multiple hollow connecting pipes (5). The connecting pipes (5) are inclined and their upper parts are connected to the stirring shaft (2). A first one-way valve (6) is provided at the connection point between the upper inner side of the connecting pipe (5) and the stirring shaft (2). The upper end of the stirring shaft (2) is a closed end. An air supply box (7) is fitted on the outer side of the upper part of the stirring shaft (2) and is sealed and rotatably connected to it. An air inlet (201) is provided on the upper part of the stirring shaft (2) and is connected to the air supply box (7). The air supply box (7) is connected to the external air supply equipment through the air supply pipe (16). The double-helix stirring blade assembly includes two first helical blades (4) arranged coaxially with opposite helical directions. A matching helical air outlet pipe (10) is installed on the lower surface of the first helical blade (4) along its helical direction. The helical air outlet pipe (10) is connected to the lower part of the adjacent connecting pipe (5). Multiple first air outlet holes (1001) are opened below the helical air outlet pipe (10) along its length direction. The inner diameter of the helical air outlet pipe (10) is less than 1 / 2 of the blade width of the first helical blade (4). The lower ends of the two first helical blades (4) are connected to the lower part of the stirring shaft (2) through a support frame (11). The lower part of the tank (1) is a conical structure, and a variable diameter spiral tube (12) is installed on its inner wall along its surface. The variable diameter spiral tube (12) is spaced apart from the lower inner wall of the tank (1) through the mounting seat (13). Multiple second air outlets (1201) are opened in the lower part of the variable diameter spiral tube (12) along its length direction. The lower opening of the variable diameter spiral tube (12) is a closed opening. One end of the variable diameter spiral tube (12) passes through the tank (1) and is connected to the external air supply equipment. A second one-way valve is provided inside the upper part of the variable diameter spiral tube (12) near the air supply equipment.

2. The lubricating oil blending system according to claim 1, characterized in that, The stirring shaft (2) is also provided with a second spiral blade (14) along its length direction. The second spiral blade (14) is arranged around the stirring shaft (2) and is located inside the spiral space enclosed by the two first spiral blades (4).

3. The lubricating oil blending system according to claim 1, characterized in that, The maximum outer diameter of the variable diameter spiral tube (12) is smaller than the maximum outer diameter of the spiral outlet tube (10).

4. The lubricating oil blending system according to claim 1, characterized in that, The support frame (11) is located above the variable diameter spiral tube (12). The support frame (11) includes bubble breaking rods (1101) symmetrically arranged on both sides of the stirring shaft (2). The outermost radial end of the bubble breaking rods (1101) is located outside the variable diameter spiral tube (12).

5. A lubricating oil blending system according to claim 1, characterized in that, The lower end of the stirring shaft (2) is connected to the lower part of the tank (1) through the bearing seat (15). The stirring shaft (2) is rotatably connected to the bearing seat (15). The bearing seat (15) is located inside the space enclosed by the variable diameter spiral tube (12) and is higher than the discharge port (102) in the axial direction.

6. A lubricating oil blending system according to claim 1, characterized in that, The lower part of the connecting pipe (5) is provided with a plurality of third air outlets (503) along its length.

7. A lubricating oil blending system according to claim 6, characterized in that, The connecting pipe (5) includes an integrally formed support straight pipe (501) and a connecting straight pipe (502). One end of the connecting straight pipe (502) is connected to the stirring shaft (2), and the support straight pipe (501) is connected to the lower surface of the first spiral blade (4).

8. A lubricating oil blending system according to claim 6, characterized in that, The gas supplied by the gas supply device is divided into two independent flow channels, including a first gas and a second gas. The first gas flows through the gas supply box (7), the air inlet (201), the hollow cavity of the stirring shaft (2), the first one-way valve (6), and the connecting pipe (5) in sequence, and is finally released from the first air outlet (1001) and / or the third air outlet (503) on the spiral air outlet pipe (10); the second gas flows through the variable diameter spiral pipe (12) and the second one-way valve, and is released from the second air outlet (1201) on it.

9. A lubricating oil blending system according to claim 1, characterized in that, The air inlet (201) has a conical structure, and the outer opening is larger than the inner opening.

10. A blending method for a lubricating oil blending system, using the lubricating oil blending system according to any one of claims 1-9, comprising the following steps: S1, Feeding The base oil and functional additives are added into the tank (1) through the feed port (101) above the tank (1) until the preset liquid level is reached; S2, Pre-ventilation and pressure building When the external air supply equipment is started, the compressed air is divided into two paths and enters the system. The first path of gas enters the hollow connecting pipe (5) and the spiral outlet pipe (10) through the air supply box (7), the hollow stirring shaft (2), and the first check valve (6). The second path of gas enters the variable diameter spiral pipe (12) and opens the second check valve, so that a stable positive pressure is formed inside each air passage to prevent lubricating oil backflow. S3, Start stirring Turn on the drive motor (3), and the drive motor (3) will drive the hollow stirring shaft (2), the double helix stirring blade assembly and the support frame (11) to rotate synchronously; S4, gas-liquid synergistic blending The rotating double helix stirring blade assembly mechanically shears and convects the material in the tank. The airflow is discharged upward from the first vent, the second vent, and the third vent, forming a turbulent airflow. The bubble breaking rod (1101) cuts and refines the rising bubbles. S5, Discharge and Oil Discharge After mixing, open the discharge port (102) at the bottom of the tank (1) to discharge all the lubricating oil that has been mixed evenly in the tank; S6, Pipeline purging and anti-clogging After the lubricating oil is completely drained, the external air supply equipment is kept in the air supply for a preset time. The airflow is used to purge the connecting pipe (5), the spiral air outlet pipe (10) and the variable diameter spiral pipe (12) to remove the residual lubricating oil in the pipeline. S7, Sequential shutdown Turn off the drive motor (3) and the external air supply equipment in sequence to complete the lubricating oil mixing process.

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