Screw pump with isolation sealing structure

Abstract

The utility model discloses a screw pump with an isolation sealing structure, which comprises a pump body and a screw rod, the screw rod is rotatably connected in the pump body, one end of the pump body is provided with a gear box, the joint of the screw rod and the pump body is provided with a bearing seat, an oil seal and a front bearing are arranged in the bearing seat, and the oil seal and the front bearing are arranged in the pump body. An oil flinger is arranged between the oil seal and the bearing, an oil leakage gap exists between the oil flinger and the inner wall of the bearing seat, oil is blocked by the oil flinger when thrown up by rotation of a gear, direct impact of the oil on the oil seal is avoided, the oil seal is well protected, the oil leakage phenomenon of the oil seal is delayed, and the service life of the oil seal is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of screw pumps, in particular to a screw pump with an isolation sealing structure. Background Art

[0002] The screw vacuum pump is an exhaust device that uses a pair of screws to rotate synchronously at high speed in opposite directions in the pump casing to produce suction and exhaust effects. It is an upgraded version of the oil-sealed vacuum pump and can extract gases containing a large amount of water vapor and a small amount of dust. It is widely used in domestic pharmaceutical, chemical, semiconductor and other corporate fields that have high requirements for clean vacuum.

[0003] After searching, the Chinese patent with announcement number CN203308711U discloses a double-headed screw vacuum pump, which belongs to the field of vacuum acquisition equipment. The active rotor and the driven rotor are a pair of double-headed screw rotors with symmetrical end profiles and opposite rotation directions. The active rotor and the driven rotor are meshed with each other and installed in the pump body. The meshing curve of the active rotor and the driven rotor divides the large vacuum chamber into several small vacuum chambers. With the synchronous rotation of the active rotor and the driven rotor, the meshing line gradually moves toward the exhaust port to discharge the gas out of the pump body. The double-headed screw rotor of the double-headed screw vacuum pump can achieve dynamic balance to the maximum extent, and there is no need to design weight reduction holes at both ends of the rotor. It has the advantages of high exhaust efficiency, low exhaust noise and exhaust temperature, and low power consumption.

[0004] However, an oil seal is usually set at the connection between the active rotor and the front cover to prevent oil leakage from the bearing. During actual use, the lubricating oil is easily thrown up by the rotating gears in the gear box and sprayed directly onto the oil seal, which can easily cause damage to the oil seal and cause oil leakage at that place, resulting in a short service life of the oil seal. Utility Model Content

[0005] In order to further improve the service life of the oil seal, the present application provides a screw pump with an isolation sealing structure.

[0006] The present application provides a screw pump with an isolation sealing structure, which adopts the following technical solution:

[0007] A screw pump with an isolation sealing structure comprises a pump body and a screw, wherein the screw is rotatably connected in the pump body, a gear box is provided at one end of the pump body, a bearing seat is provided at the connection between the screw and the pump body, an oil seal and a front bearing are provided in the bearing seat, an oil flinger pan is provided between the oil seal and the bearing, and an oil leakage gap exists between the oil flinger pan and the inner wall of the bearing seat.

[0008] Optionally, an annular oil-spinning groove is provided on the outer side wall of the oil-spinning pan.

[0009] Optionally, a bearing pressure plate for pressing the front bearing is connected to the bearing seat, and an oil inlet channel is formed between the bearing pressure plate and the bearing seat.

[0010] Optionally, the oil slinger pan has an abutment portion abutting against the front bearing on one side thereof close to the front bearing, the outer diameter of the abutment portion is smaller than the outer diameter of the oil slinger pan and an oil storage cavity is formed at the outer ring of the abutment portion.

[0011] Optionally, a shaft sleeve is sleeved on the end of the screw, the oil seal abuts against the outer wall of the shaft sleeve, one end of the shaft sleeve abuts against the oil-slinging pan, and a sealing ring is provided at the end of the shaft sleeve away from the oil-slinging pan.

[0012] Optionally, the pump body includes a shell, a front cover and a rear cover, the front cover and the rear cover are detachably connected to the shell, a rear bearing for supporting the end of the screw is arranged in the rear cover, one end of the screw passes through the rear cover, and a cover plate detachably connected to the rear cover is arranged on the end face of the rear cover, and the cover plate covers the end of the screw.

[0013] Optionally, the shell, the front cover and the rear cover are each provided with cooling chambers that are interconnected, and the pump body is provided with an inlet and an outlet that are connected to the cooling chamber.

[0014] Optionally, openings communicating with the cooling chamber are provided on the top wall and the bottom wall of the shell, and covers detachably connected thereto are provided at corresponding openings of the shell.

[0015] Optionally, a heat sink is integrally formed on the outer wall of the shell.

[0016] In summary, the present application includes at least one of the following beneficial technical effects:

[0017] 1. When the oil is thrown up by the gear, the oil is blocked by the oil-throwing plate, which prevents the oil from directly impacting the oil seal, provides good protection for the oil seal, delays oil leakage, and increases the service life of the oil seal;

[0018] 2. The setting of the oil-slinging groove can play a certain role in oil storage. The oil blocked by the oil-slinging plate falls into the oil-slinging groove and then is brushed out and slowly flows to the oil seal through the oil leakage gap, which can achieve lubrication without causing direct impact on the oil seal;

[0019] 3. The design of the cooling chamber can cool the entire pump body well, ensuring that the screw pump is in good working condition, while also preventing the internal temperature from being too high and affecting the life of components. The cooling medium enters through the inlet and is discharged from the outlet, realizing the circulation of the cooling medium to achieve better cooling performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall structural diagram of an embodiment of the present application.

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0022] Description of reference numerals:

[0023] 1. Pump body; 2. Screw; 3. Gear box; 4. Gear; 5. Coupling; 6. Housing; 7. Front cover; 8. Rear cover; 9. Driving shaft; 10. Bearing seat; 11. Front bearing; 12. Oil seal; 13. Screw; 14. Bearing pressure plate; 15. Oil inlet channel; 16. Oil throwing plate; 17. Oil throwing groove; 18. Oil leakage gap; 19. Abutment; 20. Oil storage chamber; 21. Bushing; 22. Abutment sleeve; 23. Sealing ring; 25. Cover plate; 26. Cooling chamber; 27. Through port; 28. Cover; 29. ​​Heat sink. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-2 This application is described in further detail.

[0025] The embodiment of the present application discloses a screw pump with an isolation sealing structure.

[0026] like Figure 1 and Figure 2 As shown, a screw pump with an isolation sealing structure includes a pump body 1 and a screw 2. Two screws 2 are arranged in parallel and are rotatably connected in the pump body 1. A gear box 3 is arranged at one end of the pump body 1. Gears 4 for transmitting the ends of the two screws 2 are arranged in the gear box 3. A coupling 5 for connecting to a motor is arranged on the side of the gear box 3 away from the pump body 1. The coupling 5 is connected to one of the gears 4 to form power output transmission. The pump body 1 includes a shell 6, a front cover 7 and a rear cover 8. The front cover 7 and the rear cover 8 are both detachably connected to the shell 6. The front cover 7 and the rear cover 8 are fixed to the shell 6 by screws 13.

[0027] like Figure 1 and Figure 2 As shown, one of the screw rods 2 serves as an active screw rod and has an active shaft 9 connected to the gear 4. The active shaft 9 passes through the front cover 7 and is connected to the coupling 5. A bearing seat 10 is provided at the front cover 7 corresponding to the active shaft 9. A front bearing 11 and an oil seal 12 which are sleeved with the active shaft 9 are provided in the bearing seat 10. A bearing pressure plate 14 which is detachably connected to the bearing seat 10 and close to the gear box 3 is provided on the side of the bearing seat 10 close to the gear box 3. The bearing pressure plate 14 is fixed to the bearing seat 10 by screws 13 to press the front bearing 11 and prevent it from falling out. The bearing pressure plate 14 is located in the gear box 3. There is a certain distance between the bearing pressure plate 14 and the bearing seat 10 to form an oil inlet channel 15. In this way, the oil at the bottom of the gear box 3 is thrown up during the rotation of the gear 4, and the thrown-up oil can enter the front bearing 11 through the oil inlet channel 15 to effectively lubricate it.

[0028] like Figure 1 and Figure 2 As shown, an oil-flinging pan 16 is provided between the front bearing 11 and the oil seal 12, and an oil leakage gap 18 is provided between the oil-flinging pan 16 and the inner wall of the bearing seat 10. The oil can slowly flow to the oil seal 12 through the oil leakage gap 18 to lubricate more areas of the driving shaft 9. At the same time, with the help of the setting of the oil-flinging pan 16, when the oil is thrown up by the rotation of the gear 4, the oil is blocked by the oil-flinging pan 16 to avoid the direct impact of the oil on the oil seal 12, thereby providing good protection for the oil seal 12, delaying the oil leakage of the oil seal 12, and increasing the service life of the oil seal 12.

[0029] like Figure 1 and Figure 2 As shown, an annular oil-slinging groove 17 is provided on the outer periphery of the oil-slinging plate 16. The setting of the oil-slinging groove 17 can play a certain role in storing oil. The oil blocked by the oil-slinging plate 16 falls into the oil-slinging groove 17 and then is brushed out and slowly flows to the oil seal 12 through the oil leakage gap 18, so that lubrication is achieved while not easily causing direct impact on the oil seal 12. The oil-slinging plate 16 has an abutting portion 19 abutting the front bearing 11 on one side close to the front bearing 11. The outer diameter of the abutting portion 19 is smaller than the outer diameter of the oil-slinging plate 16, and an oil storage chamber 20 is formed at the outer circle of the abutting portion 19. The oil storage chamber 20 can play a role in temporarily storing oil. The oil flowing from the front bearing 11 and the oil inlet channel 15 flows into the oil storage chamber 20, and then gradually flows to the oil leakage gap 18. The oil storage chamber 20 itself is connected to the inside of the front bearing 11, and the oil in the oil storage chamber 20 can always maintain good lubrication for the front bearing 11.

[0030] like Figure 1 and Figure 2 As shown, a sleeve 21 sleeved on the driving shaft 9 is also provided inside the front cover 7, one end of the sleeve 21 has an abutting sleeve 22 abutting against the end face of the screw 2, the other end of the sleeve 21 abuts against the oil-slinging pan 16, the oil seal 12 abuts against the outer wall of the sleeve 21, and the end of the sleeve 21 away from the oil-slinging pan 16 has a sealing ring 23, and the sealing ring 23 realizes a good seal at the connection between the sleeve 21 and the abutting sleeve 22.

[0031] like Figure 1 and Figure 2 As shown, there is a rear bearing supporting the end of the driving shaft 9 inside the rear cover 8. One end of the driving shaft 9 passes through the rear cover 8. A cover plate 25 detachably connected to the rear cover 8 is provided on the end surface of the rear cover 8. The cover plate 25 is fixed to the rear cover 8 by screws 13. The cover plate 25 covers the end of the driving shaft 9. When the rear bearing needs to be inspected and replaced, it only needs to be removed. It is simple and convenient.

[0032] like Figure 1 and Figure 2As shown, there are cooling chambers 26 interconnected inside the shell 6, the front cover 7, and the rear cover 8, and the pump body 1 has an inlet and an outlet connected to the cooling chamber 26. In actual use, the cooling medium enters the cooling chamber 26 through the inlet, flows through the pump body 1 and is discharged from the outlet, so as to realize the recycling of the cooling medium and achieve a good cooling effect for the pump body 1; in addition, a through hole 27 connected to the cooling chamber 26 is provided on the top wall and the bottom wall of the shell 6, and a cover 28 for sealing it is provided at the corresponding through hole 27 of the shell 6, and the cover 28 is detachably connected to the shell 6 by screws 13, so that when it is necessary to clean and inspect the inside of the cooling chamber 26, the cover 28 can be disassembled, and when it is necessary to discharge the cooling medium remaining in the cooling chamber 26, the cover 28 located at the bottom of the shell 6 can be opened, and a heat sink 29 integrally formed therewith is also provided on the outer wall of the shell 6, and the heat sink 29 is used to further improve the heat dissipation performance of the shell 6, so that the screw 2 pump can maintain a better working state and avoid the situation of excessive temperature during operation.

[0033] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A screw pump with an isolation seal structure, comprising a pump body (1) and a screw (2), wherein the screw (2) is rotatably connected in the pump body (1), and a gear box (3) is provided at one end of the pump body (1), characterized in that: A bearing seat (10) is provided at the connection between the screw (2) and the pump body (1), an oil seal (12) and a front bearing (11) are provided in the bearing seat (10), an oil flinger (16) is provided between the oil seal (12) and the bearing, and an oil leakage gap (18) is provided between the oil flinger (16) and the inner wall of the bearing seat (10).

2. A screw pump with an isolation seal structure according to claim 1, characterized in that: An annular oil-spinning groove (17) is provided on the outer side wall of the oil-spinning plate (16).

3. A screw pump with an isolation seal structure according to claim 1, characterized in that: The bearing seat (10) is connected to a bearing pressure plate (14) for pressing the front bearing (11), and an oil inlet channel (15) is formed between the bearing pressure plate (14) and the bearing seat (10).

4. A screw pump with an isolation seal structure according to claim 3, characterized in that: The oil-slinging plate (16) has an abutting portion (19) on one side close to the front bearing (11) for abutting the front bearing (11). The outer diameter of the abutting portion (19) is smaller than the outer diameter of the oil-slinging plate (16) and an oil storage cavity (20) is formed at the outer ring of the abutting portion (19).

5. The screw pump with an isolation seal structure according to claim 1, characterized in that: A shaft sleeve (21) is sleeved on the end of the screw rod (2), the oil seal (12) abuts against the outer wall of the shaft sleeve (21), one end of the shaft sleeve (21) abuts against the oil-slinging plate (16), and a sealing ring (23) is provided at the end of the shaft sleeve (21) away from the oil-slinging plate (16).

6. The screw pump with an isolation seal structure according to claim 1, characterized in that: The pump body (1) comprises a housing (6), a front cover (7) and a rear cover (8); the front cover (7) and the rear cover (8) are both detachably connected to the housing (6); a rear bearing for supporting the end of the screw (2) is arranged in the rear cover (8); one end of the screw (2) passes through the rear cover (8); a cover plate (25) detachably connected thereto is arranged on the end surface of the rear cover (8); the cover plate (25) covers the end of the screw (2).

7. A screw pump with an isolation seal structure according to claim 6, characterized in that: The housing (6), the front cover (7) and the rear cover (8) are all provided with cooling chambers (26) which are interconnected, and the pump body (1) is provided with an inlet and an outlet which are connected with the cooling chamber (26).

8. The screw pump with an isolation seal structure according to claim 6, characterized in that: Through openings (27) communicating with the cooling chamber (26) are provided on the top wall and the bottom wall of the shell (6), and a sealing cover (28) detachably connected thereto is provided at a position of the shell (6) corresponding to the through opening (27).

9. The screw pump with an isolation seal structure according to claim 6, characterized in that: A heat sink (29) is integrally formed on the outer wall of the housing (6).

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