Roots vacuum pump with double oil tanks

Abstract

The invention provides a double-oil-tank roots vacuum pump which comprises a motor, a pump shell and rotors, a first center shaft and a second center shaft are arranged between the two rotors respectively, a first oil tank, a control box and a second oil tank are sequentially arranged at the side end of the pump shell, and the first oil tank and the second oil tank are each provided with an oil inlet and an oil discharge port. A first gear set and a second gear set are arranged in the first oil tank and the second oil tank respectively, a first clutch assembly is arranged between the first gear set and the first center shaft and between the first gear set and the second center shaft, and a second clutch assembly is arranged between the second gear set and the first center shaft and between the second gear set and the second center shaft. The first clutch assembly and the second clutch assembly are used for controlling connection and disconnection between the first gear set and the first center shaft and connection and disconnection between the second gear set and the second center shaft correspondingly, shutdown oiling is not needed, and the production efficiency is guaranteed.

Description

Technical Field

[0001] The invention relates to a Roots vacuum pump, in particular to a double-oil-tank Roots vacuum pump. Background Art

[0002] A Roots vacuum pump is a variable displacement vacuum pump that has two blade-shaped rotors rotating synchronously in opposite directions. There is a small gap between the rotors and between the rotors and the inner wall of the pump casing, and they do not contact each other.

[0003] In some chemical production lines, Roots vacuum pumps are needed for vacuuming. Such Roots vacuum pumps need to keep working for a long time. However, after working for a period of time, the lubricating oil in the gear box needs to be replaced, and the gear box needs to be cleaned to remove the sludge in the gear box to ensure the service life of the gears. However, the Roots vacuum pump needs to be shut down when replacing the lubricating oil and cleaning the gear box. Otherwise, the gear wear will be aggravated during the replacement and cleaning process. The entire production line needs to stop working after the Roots vacuum pump is shut down, and the start-up and shutdown costs of some production lines are relatively high. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a double-tank Roots vacuum pump, which has the function of amplifying torque to ensure smooth starting of the pump body.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a double-oil-tank Roots vacuum pump, comprising a motor, a pump casing and a pair of rotors arranged in the pump casing, a central shaft one and a central shaft two are respectively arranged in the middle of the two rotors, a first oil tank, a control box and a second oil tank are sequentially arranged on the side ends of the pump casing, the first oil tank and the second oil tank are both provided with an oil inlet and an oil unloading port, a first gear group and a second gear group are respectively arranged in the first oil tank and the second oil tank, a first clutch assembly is arranged between the first gear group and the central shaft one and the central shaft two, a second clutch assembly is arranged between the second gear group and the central shaft one and the central shaft two, the first clutch assembly and the second clutch assembly are respectively used to control the on and off of the first gear group, the second gear group and the central shaft one and the central shaft two, and a control assembly for controlling the clutch of the first clutch assembly and the second clutch assembly is provided in the control box.

[0006] Through the above technical means, by setting up two oil tanks and setting gear sets in both oil tanks, the central shaft and one of the pairs of gears can be controlled to rotate coaxially through the clutch assembly. When oil change is required, the gears in one oil tank are engaged, and the gears in the other oil tank do not rotate. There is no need to stop the machine, thereby ensuring production efficiency. At the same time, setting up two sets of gears can increase the life of the pump to a certain extent.

[0007] Preferably, a gear mounting frame 1 is provided in the first oil tank, a gear mounting frame 2 is provided in the second oil tank, a center rod is provided on the gear mounting frame 2, the second gear set is provided on the center rod, a mounting ring is provided on the gear mounting frame 1, and the first gear set is provided on the mounting ring.

[0008] Through the above technical means, by setting the gear rack 1 and the gear rack 2, the gear is prevented from contacting the central shaft while ensuring the installation of the gear.

[0009] Preferably, the first clutch assembly and the second clutch assembly have the same structure. The first clutch assembly includes a resisting ring and a driven ring. The resisting ring is slidably arranged on the central shaft one and the central shaft two, and a flat key is arranged between the resisting ring and the central shaft one and the central shaft two. The driven ring is fixedly arranged on the side ends of the first gear group and the second gear group, and the control assembly controls the resisting ring to move toward the first gear group and the second gear group.

[0010] Through the above technical means, through the cooperation between the resisting ring and the driven ring, when the resisting ring and the driven ring come into contact, the central shaft one and the central shaft two drive the gear to rotate.

[0011] Preferably, the clutch assembly further comprises a pre-stressing ring, which is made of brass and rotates with the resisting ring. A mounting ring is provided at the side end of the driven ring, and the pre-stressing ring is slidingly sleeved on the mounting ring. Both the side end of the pre-stressing ring and the side end of the driven ring are provided with an inclined abutment surface. A pressure spring is further provided between the pre-stressing ring and the resisting ring. When the resisting ring approaches the driven ring, the pre-stressing ring first abuts against the driven ring through the inclined abutment surface. The clutch assembly further comprises a toothed part.

[0012] Through the above technical means, by providing a pre-compression ring made of brass, the direct contact between the driven ring and the retaining ring is reduced, thereby ensuring the service life of the retaining ring and the driven ring.

[0013] Preferably, the locking tooth part includes a gear ring arranged on the resisting ring, inner teeth are arranged in the gear ring, outer teeth 1 are arranged on the driven ring, outer teeth 2 are arranged on the pre-pressure ring, the inner teeth are clamped into outer teeth 2, and the inner teeth gradually extend into outer teeth 1 after the resisting ring approaches the pre-pressure ring. A tooth groove is also provided in the pre-pressure ring, and outer teeth 2 are arranged in the tooth groove. A compression spring is also provided between the bottom surface of the tooth groove and outer teeth 2. The outer side of the inner teeth and the top surface of outer teeth 2 are both inclined, and outer teeth 1 and the front end of the inner teeth are both provided with inclined resisting surface 2.

[0014] Through the above-mentioned technical means, by setting the gear ring, outer tooth one and outer tooth two, and utilizing the function of the pre-load ring to pre-drive the driven ring to rotate, the driven ring starts to rotate with the gear ring before it cooperates with the outer tooth one, so that during the movement of the abutment ring, the gear ring can cooperate with the outer tooth one more easily, reducing the impact force between the outer tooth one and the gear ring, and by setting the inclined abutment surface two, the meshing is made easier.

[0015] Preferably, the control component includes a push plate 1, a push plate 2, a rotating rod and a handle, the push plate 1 and the push plate 2 are both slidably set on the central axis 1 and the central axis 2, the push plate 1 is used to drive the first clutch component to move, and the push plate 2 is used to drive the second clutch component to move, the push plate 1 and the push plate 2 are both provided with a protrusion on the inner side, the protrusion abuts on the rotating rod, the rotating rod is provided with a travel groove, the protrusion abuts on the surface of the rotating rod, the rotating rod passes through and is exposed from the pump housing, and the handle is installed at the end of the rotating rod.

[0016] Through the above technical means, the handle is used to rotate the rotating rod, so that the protrusion rotates on the rotating rod. By setting a groove on the rotating rod, the push plate one and the push plate two are pushed to move, thereby realizing the clutch function. By setting a handle, the force arm is increased, making the rotation of the rotating rod easier.

[0017] Preferably, the control assembly further includes a large gear, a small gear and a limit block, the small gear is fixedly arranged on the rotating rod, the large gear is arranged on the side end of the small gear and meshes with the small gear, and the handle is fixedly arranged on the large gear and drives the large gear to rotate.

[0018] By means of the above technical means, the large gear drives the small gear to rotate, thereby making the rotation of the rotating rod easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment; Figure 2 is an internal schematic diagram of an embodiment; Figure 3 for Figure 2 AA cross-sectional view in FIG; Figure 4 is a schematic cross-sectional view of an embodiment; Figure 5 for Figure 4 A partial cross-sectional view of Figure 6 is a structural schematic diagram of the first clutch assembly; Figure 7 for Figure 6 Schematic diagram of part B; Figure 8 A schematic diagram of the handle structure.

[0020] Figure 1: Motor; 2: Pump housing; 3: Rotor; 4: Center shaft 1; 5: Center shaft 2; 6: First oil tank; 7: Second oil tank; 8: Control box; 9: Oil inlet; 10: Oil discharge port; 11: First gear set; 12: Second gear set; 13: First clutch assembly; 14: Second clutch assembly; 15: Control assembly; 16: Gear mounting frame 1; 17: Gear mounting frame 2; 18: Center rod; 19: Mounting collar; 20: Back ring; 21: From Moving ring; 22. Pre-load ring; 23. Gear piece; 24. Mounting ring; 25. Oblique abutment surface 1; 26. Pressure spring; 27. Gear ring; 28. Inner teeth; 29. Outer teeth 1; 30. Outer teeth 2; 31. Tooth groove; 32. Compression spring; 33. Oblique abutment surface 2; 34. Push plate 1; 35. Push plate 2; 36. Rotating rod; 37. Handle; 38. Sealing ring; 39. Return spring; 40. Bump; 41. Travel groove; 42. Large gear; 43. Small gear. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0022] A double-tank Roots vacuum pump comprises a motor 1, a pump casing 2 and a pair of rotors 3 arranged in the pump casing 2. The rotor 3 is leaf-shaped and has a hole in the center of the rotor 3 for reducing weight. A center axis 1 4 and a center axis 2 5 are respectively arranged between the two rotors 3. The main shaft of the motor 1 is fixed to the center axis 1 4. A first oil tank 6, a control box 8 and a second oil tank 7 are sequentially arranged on the side ends of the pump casing 2. An oil inlet 9 and an oil unloading port 10 are both provided on the first oil tank 6 and the second oil tank 7. A first gear set 11 and a second gear set 12 are respectively provided in the first oil tank 6 and the second oil tank 7. A first clutch assembly 13 is provided between the first gear set 11 and the center axis 1 4 and the center axis 2 5. A second clutch assembly 14 is provided between the second gear set 12 and the center axis 1 4 and the center axis 2 5. The first clutch assembly The first gear set 11 and the second gear set 12 are respectively used to control the on and off of the central shaft 1 4 and the central shaft 2 5. The first gear set 11 and the second gear set 12 are composed of two gears meshing with each other, thereby controlling the rotation of the two rotors 3. A control component 15 for controlling the clutch of the first clutch component 13 and the second clutch component 14 is provided in the control box 8. When oil change is required, the first clutch component 13 controls the first gear set 11 to rotate coaxially with the central shaft 1 4 and the central shaft 2 5, so as to replace the lubricating oil in the second oil tank 7. Conversely, the second clutch component 14 controls the second gear set to rotate coaxially with the central shaft 1 4 and the central shaft 2 5, so as to replace the lubricating oil in the first oil tank 6. There is no need to stop the machine when replacing the lubricating oil, thereby ensuring production efficiency.

[0023] A gear mounting frame 16 is provided in the first oil tank 6, a gear mounting frame 2 17 is provided in the second oil tank 7, a center rod 18 is provided on the gear mounting frame 2 17, the second gear set 12 is provided on the center rod 18, a mounting collar 19 is provided on the gear mounting frame 16, and the first gear set 11 is provided on the mounting collar 19. By arranging the gear frame 1 and the gear frame 2, the gears are prevented from contacting the center shaft while ensuring the installation of the gears.

[0024] The first clutch assembly 13 and the second clutch assembly 14 have the same structure. The first clutch assembly 13 includes a resisting ring 20 and a driven ring 21. The resisting ring 20 is slidably set on the central shaft 1 4 and the central shaft 2 5, and a flat key is configured between the resisting ring 20 and the central shaft 1 4 and the central shaft 2 5 to ensure that the resisting ring 20 rotates coaxially with the central shaft 1 4 and the central shaft 2 5. The driven ring 21 is fixedly set on the side end of a single gear in the first gear group 11 and the second gear group 12 and is integrally formed. The control assembly 15 controls the resisting ring 20 to move toward the first gear group 11 and the second gear group 12.

[0025] The clutch assembly also includes a pre-stressing ring 22 and a toothed part 23. The pre-stressing ring 22 is made of brass. The pre-stressing ring 22 rotates with the resisting ring 20 through the toothed part 23. A mounting ring 24 is provided at the side end of the driven ring 21. The pre-stressing ring 22 is slidably sleeved on the mounting ring 24. The side ends of the pre-stressing ring 22 and the driven ring 21 are both provided with an inclined abutment surface 25. A pressure spring 26 is provided between the pre-stressing ring 22 and the resisting ring 20. When the resisting ring 20 approaches the driven ring 21, the pressure spring 26 presses against the pre-stressing ring 22 to move, and first presses against the driven ring 21 through the inclined abutment surface 25, thereby causing the driven ring 21 to pre-rotate.

[0026] The latching member 23 includes a gear ring 27 arranged on the resisting ring 20, with an inner tooth 28 arranged in the gear ring 27, an outer tooth 1 29 arranged on the driven ring 21, and an outer tooth 2 30 arranged on the pre-load ring 22. The inner tooth 28 is clamped into the outer tooth 2 30 to ensure that the pre-load ring 22 rotates with the resisting ring 20. When the resisting ring 20 gradually approaches the pre-load ring 22, the inner tooth 28 gradually extends from the outer tooth 2 30 into the outer tooth 1 29. During this period, the pre-load ring 22 presses the driven ring 21 so that the driven ring 21 rotates with the pre-load ring 22 and its speed gradually becomes consistent. A tooth groove 31 is also provided in the pre-load ring 22, and the outer tooth 2 30 is arranged in the tooth groove 31. A compression spring 32 is also provided between the bottom surface of the tooth groove 31 and the outer tooth 2 30. The outer side of the inner tooth 28 and the top surface of the outer tooth 2 30 are both inclined. It is set that when the inner teeth 28 move toward the outer teeth 1 29, the outer teeth 2 30 gradually retract into the tooth groove 31 and provide a certain pressure for the pre-load ring 22 to press against the driven ring 21. The outer teeth 1 29 and the front ends of the inner teeth 28 are both provided with inclined contact surfaces 2 33. By providing the inclined contact surfaces 2 33, the end faces of the outer teeth 1 29 and the inner teeth 28 are made into a pointed state, thereby facilitating meshing. By providing the gear ring 27, the outer teeth 1 29 and the outer teeth 2 30, the function of the pre-load ring 22 to pre-drive the driven ring 21 to rotate is utilized, so that the driven ring 21 starts to rotate with the gear ring 27 when it is not engaged with the outer teeth 1 29, thereby ensuring that the gear ring 27 can be more easily engaged with the outer teeth 1 29 during the lateral movement of the resisting ring 20, thereby reducing the impact force received when the outer teeth 1 29 and the gear ring 27 are engaged.

[0027] The control assembly 15 includes a push plate 1 34, a push plate 2 35, a rotating rod 36 and a handle 37. The push plate 1 34 and the push plate 2 35 are both slidably arranged on the central shaft 1 4 and the central shaft 2 5. At the same time, a sealing ring 38 is provided between the push plate 1 34 and the push plate 2 35 and the partition of the control box 8. The sealing ring 38 is preferably a sliding mechanical seal to reduce the oil entering the control box 8. The push plate 1 34 is used to drive the first clutch assembly 13 to move, and the push plate 2 35 is used to drive the second clutch assembly 14 to move. A reset spring 39 is also provided between the push plate 1 34, the push plate 2 35 and the inner wall of the control box 8. A protrusion 40 is provided on the inner side of the push plate 1 34 and the push plate 2 35. The protrusion 40 is against the rotating rod 36, and the rotating rod 36 is provided with a travel groove 4 1. The protrusion 40 abuts against the surface of the rotating rod 36. When the protrusion 40 abuts in the stroke groove 41, the return spring 39 drives the push plate 1 34 or the push plate 2 35 to move back, so that the clutch assembly disengages the first gear group 11 or the second gear group 12. When the protrusion 40 does not abut in the stroke groove 41, the return spring 39 is compressed, and the clutch assembly is pressed against the first gear group 11 or the second gear group 12. The rotating rod 36 passes through and is exposed to the pump housing 2. The handle 37 is installed at the end of the rotating rod 36. The rotating rod 36 is rotated by the handle 37, so that the protrusion 40 rotates on the rotating rod 36. By setting a groove on the rotating rod 36, the push plate 1 34 and the push plate 2 35 are pushed to move, thereby realizing the clutch function. By setting the handle 37, the force arm is increased, making the rotation of the rotating rod 36 easier.

[0028] The control assembly 15 also includes a large gear 42, a small gear 43 and a limit block. The small gear 43 is fixedly set on the rotating rod 36. The large gear 42 is set at the side end of the small gear 43 and meshes with the small gear 43. The handle 37 is fixedly set on the large gear 42 and drives the large gear 42 to rotate. The small gear 43 is driven to rotate by the large gear 42, thereby making the rotation of the rotating rod 36 easier.

[0029] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A double-tank Roots vacuum pump, comprising a motor (1), a pump housing (2), and a pair of rotors (3) disposed in the pump housing (2), wherein a first center axis (4) and a second center axis (5) are disposed between the two rotors (3), respectively, and wherein: The side end of the pump housing (2) is provided with a first oil tank (6), a control box (8) and a second oil tank (7) in sequence. The first oil tank (6) and the second oil tank (7) are both provided with an oil inlet (9) and an oil discharge port (10). The first oil tank (6) and the second oil tank (7) are respectively provided with a first gear group (11) and a second gear group (12). A first clutch assembly (13) is provided between the first gear group (11) and the central shaft one (4) and the central shaft two (5). A second clutch assembly (14) is provided between the second gear group (12) and the central shaft one (4) and the central shaft two (5). The first clutch assembly (13) and the second clutch assembly (14) are respectively used to control the connection and disconnection of the first gear group (11) and the second gear group (12) and the central shaft one (4) and the central shaft two (5). The control box (8) is provided with a control assembly (15) for controlling the clutching of the first clutch assembly (13) and the second clutch assembly (14).

2. A double-tank Roots vacuum pump according to claim 1, characterized in that: A first gear mounting frame (16) is provided in the first oil tank (6), a second gear mounting frame (17) is provided in the second oil tank (7), a center rod (18) is provided on the second gear mounting frame (17), the second gear set (12) is provided on the center rod (18), a mounting collar (19) is provided on the first gear mounting frame (16), and the first gear set (11) is provided on the mounting collar (19).

3. The double-tank Roots vacuum pump according to claim 1, characterized in that: The first clutch assembly (13) and the second clutch assembly (14) have the same structure. The first clutch assembly (13) includes a resisting ring (20) and a driven ring (21). The resisting ring (20) is slidably arranged on the central shaft (4) and the central shaft (5), and a flat key is arranged between the resisting ring (20) and the central shaft (4) and the central shaft (5). The driven ring (21) is fixedly arranged on the side ends of the first gear group (11) and the second gear group (12). The control assembly (15) controls the resisting ring (20) to move toward the first gear group (11) and the second gear group (12).

4. A double-tank Roots vacuum pump according to claim 3, characterized in that: The clutch assembly also includes a pre-stressing ring (22), which is made of brass. The pre-stressing ring (22) rotates following the resisting ring (20). The side end of the driven ring (21) is provided with a mounting ring (24). The pre-stressing ring (22) is slidingly sleeved on the mounting ring (24). The side ends of the pre-stressing ring (22) and the side ends of the driven ring (21) are both provided with an inclined abutting surface (25). A pressure spring (26) is also provided between the pre-stressing ring (22) and the resisting ring (20). When the resisting ring (20) approaches the driven ring (21), the pre-stressing ring (22) first abuts against the driven ring (21) through the inclined abutting surface (25). The clutch assembly also includes a toothed part (23).

5. The double-tank Roots vacuum pump according to claim 4, characterized in that: The locking tooth member (23) includes a tooth ring (27) arranged on the resisting ring (20), an inner tooth (28) is arranged in the tooth ring (27), an outer tooth 1 (29) is arranged on the driven ring (21), and an outer tooth 2 (30) is arranged on the pre-pressing ring (22). The inner tooth (28) is engaged with the outer tooth 2 (30). After the resisting ring (20) approaches the pre-pressing ring (22), the inner tooth (28) gradually extends into the outer tooth 1 (29). A tooth groove (31) is also provided in the pre-pressing ring (22). The outer tooth 2 (30) is arranged in the tooth groove (31). A compression spring (32) is also provided between the bottom surface of the tooth groove (31) and the outer tooth 2 (30). The outer side of the inner tooth (28) and the top surface of the outer tooth 2 (30) are both inclined. The front ends of the outer tooth 1 (29) and the inner tooth (28) are both provided with an inclined contact surface 2 (33).

6. The double-tank Roots vacuum pump according to claim 1, characterized in that: The control assembly (15) includes a push plate 1 (34), a push plate 2 (35), a rotating rod (36) and a handle (37). The push plate 1 (34) and the push plate 2 (35) are both slidably arranged on the central shaft 1 (4) and the central shaft 2 (5). The push plate 1 (34) is used to drive the first clutch assembly (13) to move, and the push plate 2 (35) is used to drive the second clutch assembly (14) to move. The push plate 1 (34) and the push plate 2 (35) are both provided with a protrusion (40) on the inner side. The protrusion (40) abuts on the rotating rod (36). The rotating rod (36) is provided with a stroke groove (41). The protrusion (40) abuts on the surface of the rotating rod (36). The rotating rod (36) passes through and is exposed from the pump housing (2). The handle (37) is installed at the end of the rotating rod (36).

7. The double-tank Roots vacuum pump according to claim 6, characterized in that: The control assembly (15) further comprises a large gear (42), a small gear (43) and a limit block, wherein the small gear (43) is fixedly arranged on the rotating rod (36), the large gear (42) is arranged on the side end of the small gear (43) and meshes with the small gear (43), and the handle (37) is fixedly arranged on the large gear (42) and drives the large gear (42) to rotate.

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