Multi-sealing structure of vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, and discloses a vacuum pump multiple sealing structure which is characterized by comprising a pump shell, an end cover and a rotating shaft, a sealing assembly is arranged between the end cover and the rotating shaft, a vacuum cavity is formed in the pump shell, a groove is formed in the side wall, facing the vacuum cavity, of the end cover, and the sealing assembly is located on the side, deviating from the vacuum cavity, of the groove. The air guide groove is formed in the connecting section, the air guide groove plays a role in guiding airflow, external air enters the groove through the air inlet hole and can enter the vacuum cavity through the groove and under the action of the air guide groove, and on one hand, impurities in the vacuum cavity can be brought to the exhaust port; on the other hand, impurities in the vacuum cavity can be prevented from moving towards one side of the sealing assembly, air sealing is formed, and under the combined action of the sealing assembly, the impurities are prevented from abrading the rotating shaft and the gear.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, and more particularly to a multiple sealing structure of a vacuum pump. Background Art

[0002] The vacuum pump can evacuate the air and separate the gas and liquid. Its rotating shaft is connected to the motor through a coupling. The two rotors on it are connected to each other through a stack of high-precision gears to achieve relative synchronous operation. In order to prevent the lubricating oil of the bearings and gears from flowing back into the pump cavity, the pump cavity and the gear box are separated or sealed with a mechanical structure.

[0003] During the operation of the vacuum pump, impurities in the vacuum chamber may move toward the motor side, causing the impurities to enter the gear box and wear the gears. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a vacuum pump multi-sealing structure for preventing impurities from entering the gear box.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vacuum pump multiple sealing structure, including a pump casing, an end cover and a rotating shaft, a sealing assembly is arranged between the end cover and the rotating shaft, a vacuum chamber is formed in the pump casing, a groove is provided on a side wall of the end cover facing the vacuum chamber, the sealing assembly is located on the side of the groove away from the vacuum chamber, the rotating shaft includes a connecting section located in the groove, an air guide groove is provided on the outer side of the connecting section, an air inlet hole is provided on the end cover, and the air inlet hole is connected to the air guide groove.

[0006] As a further improvement of the present invention, the air guide groove is arranged at an angle, and one end of the air guide groove away from the air inlet is arranged close to the vacuum chamber.

[0007] As a further improvement of the present invention, the air guide groove is spiral-shaped.

[0008] As a further improvement of the present invention, the inner diameter of the air inlet is less than or equal to 5 mm.

[0009] As a further improvement of the present invention, a solenoid valve is connected to the air inlet.

[0010] As a further improvement of the present invention, an oil slinger is connected to the rotating shaft, the sealing assembly includes a sleeve connected to the oil slinger, a piston ring sleeve is connected between the sleeve and the rotating shaft, and a piston sealing ring is connected between the piston ring sleeve and the sleeve.

[0011] As a further improvement of the present invention, one end of the piston ring sleeve abuts against the oil slinger plate and is provided with an annular groove, in which a sealing ring is embedded.

[0012] As a further improvement of the present invention, a shaft sleeve is connected to the rotating shaft, and the shaft sleeve is located on the side of the piston ring sleeve away from the oil slinger plate and abuts against the piston ring sleeve.

[0013] As a further improvement of the present invention, an oil seal is connected between the shaft sleeve and the insert sleeve.

[0014] Beneficial effects of the utility model: In the utility model, an air guide groove is provided on the connecting section, which plays a role in guiding the airflow. External air enters the groove through the air inlet and can enter the vacuum chamber through the groove and under the action of the air guide groove, which can bring impurities in the vacuum chamber to the exhaust port.

[0015] On the other hand, it can prevent impurities in the vacuum chamber from moving toward the side of the sealing component to form an airtight seal, and under the joint action of the sealing component, it can prevent impurities from wearing the rotating shaft and gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the conventional vacuum pump multi-sealing structure of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle.

[0019] Figure numerals: 1. Pump casing; 11. Vacuum chamber; 2. End cover; 21. Groove; 22. Air inlet; 3. Rotating shaft; 31. Connecting section; 311. Air guide groove; 32. Shaft sleeve; 4. Sealing assembly; 41. Insert sleeve; 42. Piston ring sleeve; 43. Piston sealing ring; 44. Ring groove; 45. Sealing ring; 46. Oil seal; 5. Oil slinger. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Identical components are denoted by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom," "top," "inner," and "outer" refer to directions toward or away from the geometric center of a particular component, respectively.

[0021] Reference Figures 1 to 3As shown in the figure, the multi-sealing structure of the vacuum pump in this embodiment includes a pump housing 1, an end cover 2, and a rotating shaft 3. The end cover 2 is detachably and sealingly connected to the pump housing 1. A sealing assembly 4 is provided between the end cover 2 and the rotating shaft 3. A vacuum chamber 11 is formed inside the pump housing 1. A groove 21 is formed on one side wall of the end cover 2 facing the vacuum chamber 11. The setting of the groove 21 provides a receiving space for the connecting section 31. The sealing assembly 4 is located on the side of the groove 21 away from the vacuum chamber 11. The rotating shaft 3 includes a connecting section 31 located inside the groove 21. An air guiding groove 311 is formed on the outer side surface of the connecting section 31. An air inlet hole 22 is formed on the end cover 2. The air inlet hole 22 is communicated with the air guiding groove 311. Among them, the air guiding groove 311 plays a role in guiding the airflow. The air pressure in the vacuum chamber 11 is small, and the external air pressure is large. The external air enters the groove 21 through the air inlet hole 22 and can enter the vacuum chamber 11 through the groove 21 and under the action of the air guiding groove 311. On the one hand, the impurities in the vacuum chamber 11 can be carried towards the exhaust port;

[0022] On the other hand, it can prevent the impurities in the vacuum chamber 11 from moving towards the side of the sealing assembly 4 to form an air seal. And under the combined action of the sealing assembly 4, it can prevent the impurities from wearing the rotating shaft 3 and the gear.

[0023] Refer to Figure 2 and Figure 3 As shown in the figure, the air guiding groove 311 is inclined, and the end of the air guiding groove 311 away from the air inlet hole 22 is close to the vacuum chamber 11. In this embodiment, the air inlet hole 22 is formed above the end cover 2 and extends from top to bottom to the groove 21. From the front view of the air guiding groove 311, preferably, the air guiding groove 311 is set to be inclined. The bottom end of the air guiding groove 311 is close to the side of the vacuum chamber 11, and the top end of the air guiding groove 311 is close to the side of the sealing assembly 4.

[0024] Among them, the air guiding groove 311 can be a plurality of annular grooves. Preferably, the air guiding groove 311 is spiral-shaped, and the spiral-shaped air guiding groove 311 is convenient for processing.

[0025] The inner diameter of the air inlet hole 22 is less than or equal to 5 mm. Preferably, the air inlet hole 22 is 2 - 3 mm. By controlling the aperture size of the air inlet hole 22, a large amount of external air entering the vacuum pump can be prevented from affecting the vacuum degree.

[0026] An electromagnetic valve is connected to the air inlet hole 22. The opening size of the air inlet hole 22 can be controlled through the electromagnetic valve, so as to reduce the influence brought by the aperture size of the air inlet hole 22;

[0027] And when there are more impurities discharged at the exhaust port of the vacuum chamber 11, the opening amount can be increased to increase the intake air volume of the external air, so as to better discharge the impurities;

[0028] When there are fewer impurities discharged at the exhaust port of the vacuum chamber 11, the opening amount can be reduced, and the intake amount of external air can be reduced.

[0029] Refer to Figure 3 As shown, an oil slinger 5 is connected to the rotating shaft 3. The sealing assembly 4 includes a bushing 41 connected to the oil slinger 5. A piston ring sleeve 42 is connected between the bushing 41 and the rotating shaft 3. A piston seal ring 43 is connected between the piston ring sleeve 42 and the bushing 41. The sealing performance between the piston ring sleeve 42 and the bushing 41 is achieved through the piston seal ring 43.

[0030] Refer to Figure 3 As shown, one end of the piston ring sleeve 42 abuts against the oil slinger 5, and a ring groove 44 is provided. A sealing ring 45 is embedded in the ring groove 44. At the end of the oil slinger 5 facing away from the piston ring sleeve 42, it abuts against a bearing. The bearing cooperates with the piston ring sleeve 42 to position the oil slinger 5. The setting of the sealing ring 45 increases the sealing performance between the piston ring sleeve 42 and the oil slinger 5.

[0031] A bushing 32 is connected to the rotating shaft 3. The bushing 32 is located on the side of the piston ring sleeve 42 facing away from the oil slinger 5 and abuts against the piston ring sleeve 42. The bushing 32 serves to position the piston ring sleeve 42.

[0032] An oil seal 46 is connected between the bushing 32 and the bushing 41. The setting of the oil seal 46 increases the sealing performance between the bushing 32 and the bushing 41.

[0033] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. Multiple sealing structure of vacuum pump, characterized in that: The invention comprises a pump housing (1), an end cover (2) and a rotating shaft (3); a sealing assembly (4) is provided between the end cover (2) and the rotating shaft (3); a vacuum chamber (11) is formed in the pump housing (1); a groove (21) is provided on a side wall of the end cover (2) facing the vacuum chamber (11); the sealing assembly (4) is located on a side of the groove (21) facing away from the vacuum chamber (11); the rotating shaft (3) comprises a connecting section (31) located in the groove (21); an air guide groove (311) is provided on the outer side surface of the connecting section (31); an air inlet hole (22) is provided on the end cover (2); the air inlet hole (22) is communicated with the air guide groove (311).

2. The multiple sealing structure of the vacuum pump according to claim 1, characterized in that: The air guide groove (311) is arranged at an angle, and one end of the air guide groove (311) away from the air inlet hole (22) is arranged close to the vacuum chamber (11).

3. The multiple sealing structure of the vacuum pump according to claim 1, wherein: The air guide groove (311) is spiral-shaped.

4. The multi-sealing structure of the vacuum pump according to claim 1, wherein: The inner diameter of the air inlet (22) is less than or equal to 5 mm.

5. The multi-sealing structure of the vacuum pump according to claim 1, wherein: The air inlet (22) is connected to a solenoid valve.

6. The multi-sealing structure of the vacuum pump according to claim 1, wherein: An oil slinger (5) is connected to the rotating shaft (3); the sealing assembly (4) comprises a sleeve (41) connected to the oil slinger (5); a piston ring sleeve (42) is connected between the sleeve (41) and the rotating shaft (3); and a piston sealing ring (43) is connected between the piston ring sleeve (42) and the sleeve (41).

7. The multi-sealing structure of the vacuum pump according to claim 6, characterized in that: One end of the piston ring sleeve (42) abuts against the oil slinger (5) and is provided with a ring groove (44), wherein a sealing ring (45) is embedded in the ring groove (44).

8. The multi-sealing structure of the vacuum pump according to claim 6, characterized in that: A shaft sleeve (32) is connected to the rotating shaft (3). The shaft sleeve (32) is located on a side of the piston ring sleeve (42) away from the oil slinger (5) and abuts against the piston ring sleeve (42).

9. The multi-sealing structure of the vacuum pump according to claim 8, wherein: An oil seal (46) is connected between the shaft sleeve (32) and the insert sleeve (41).

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