Roots vacuum pump with quick oil change function

Abstract

The present application relates to a Roots vacuum pump with quick oil change function, comprising a pump body, a transmission oil tank arranged on the pump body, and a quick oil change device, which can be separated from the transmission oil tank. The present application can quickly complete the replacement of lubricating oil without stopping the pump body.

Description

TECHNICAL FIELD

[0001] The application relates to the field of vacuum pumps, in particular to a Roots vacuum pump with a quick oil replacement function. BACKGROUND

[0002] A Roots vacuum pump with a quick oil replacement function is disclosed in Chinese Patent No. CN118167639B, which comprises a pump body, a driving motor and a transmission oil tank arranged at two ends of the pump body.

[0003] The lubricating oil in the transmission oil tank needs to be replaced after the vacuum pump has worked for a period of time. According to the prior art, the Roots vacuum pump needs to be stopped, the old lubricating oil in the transmission oil tank needs to be discharged, and the new lubricating oil needs to be poured into the transmission oil tank. Therefore, the lubricating oil replacement process is relatively complicated, and a structure for realizing the quick oil replacement of the Roots vacuum pump needs to be designed. SUMMARY

[0004] The application provides a Roots vacuum pump with a quick oil replacement function, which can quickly complete the replacement of lubricating oil without stopping the pump body.

[0005] The Roots vacuum pump with a quick oil replacement function provided by the application adopts the following technical scheme:

[0006] The Roots vacuum pump with a quick oil replacement function comprises a pump body, a transmission oil tank arranged on the pump body, and a quick oil replacement device. The quick oil replacement device comprises an oil replacement tank arranged on the pump body, a working cavity arranged in the oil replacement tank, a cavity, and an oil storage cavity. A first plunger pump and a second plunger pump are arranged in the working cavity, and a power mechanism is arranged in the working cavity. The first plunger pump is used for pumping the old oil in the transmission oil tank into the cavity, and the second plunger pump is used for pumping the new oil in the oil storage cavity into the transmission oil tank. The power mechanism comprises a power main shaft rotatably connected to the oil storage cavity, two driven shafts, a driving assembly used for controlling the rotation of the power main shaft, two first clutches used for connecting the power main shaft and the two driven shafts, two rotating discs arranged on the two driven shafts respectively, two hinge rods hingedly connected to the two rotating discs respectively, a shaft body one rotatably connected to the oil storage cavity, and two semicircular abutting plates symmetrically arranged on the shaft body one. The two hinge rods are hingedly connected to the piston rods of the first plunger pump and the second plunger pump respectively. The power main shaft is connected to the shaft body one through a first planetary gear set. A slope is formed on the clutch bearing of each of the two first clutches, and the two slopes are located on the rotation paths of the two abutting plates respectively. When the abutting plates rotate, the abutting plates abut against the slopes to drive the clutch bearings of the first clutches to move, so as to cut off the power connection between the power main shaft and the driven shafts. When the shaft body one rotates, the two abutting plates abut against the two slopes alternately.

[0007] By adopting the technical scheme, the two abutting plates abut against the clutch bearings of the first clutch close to the second plunger pump in the initial state, so that the power between the driven shaft connected with the second plunger pump and the power main shaft is in the disconnected state, and the second plunger pump is not started. When oil change is needed, the driving assembly drives the power main shaft to rotate, and the power main shaft rotates to drive the piston of the first plunger pump to reciprocate through the driven shaft and other structures, so that the first plunger pump pumps the old oil in the transmission oil tank into the cavity. When the power main shaft rotates, the shaft body one rotates through the first planetary gear set, and the power main shaft rotates 300 times to make the shaft body one rotate one time. After the power main shaft rotates 150 times, the abutting state of the two abutting plates and the two inclined surfaces is exchanged, the power connection between the first plunger pump and the power main shaft is disconnected, the power connection between the second plunger pump and the power main shaft is connected, and the power main shaft rotates to drive the piston of the second plunger pump to reciprocate, so that the second plunger pump pumps the new oil in the oil storage cavity into the transmission oil tank, and the new oil is filled.

[0008] Preferably, the transmission oil tank is provided with a first oil inlet pipe and a first oil outlet pipe which are in communication with the inner cavity of the transmission oil tank, the oil change tank is provided with a second oil inlet pipe and a second oil outlet pipe, the second oil inlet pipe and the first oil outlet pipe are connected through a quick connector, the second oil outlet pipe and the first oil inlet pipe are connected through a quick connector, the second oil inlet pipe is connected with the first plunger pump, and the second oil outlet pipe is connected with the second plunger pump.

[0009] By adopting the technical scheme, the butt joint of the pipeline is facilitated.

[0010] Preferably, the driving assembly comprises shaft body two and shaft body three which are rotationally connected in the oil storage cavity, a second clutch for connecting the shaft body two and the shaft body three, a gear one provided on the shaft body three, a gear two provided on the power main shaft, and an abutting part for abutting against the clutch bearing of the second clutch, the gear one is engaged with the gear two, and the shaft body two away from the shaft body three is connected with the power shaft of the pump body extending into the transmission oil tank through a second planetary gear set.

[0011] By adopting the technical scheme, the pump body can realize oil change without shutdown. When the pump body is in the starting state, the shaft body two is always in the rotating state, when oil change is needed, the abutting part is removed from the clutch bearing of the second clutch, so that the shaft body two drives the shaft body three to rotate when the shaft body two rotates, and the shaft body three drives the power main shaft to rotate. After the power main shaft rotates 300 times, the abutting part abuts against the clutch bearing of the second clutch, the connection between the shaft body two and the shaft body three is cut off, and the power main shaft stops rotating.

[0012] Preferably, the pressing part comprises a shaft body five rotatably connected in the oil storage cavity, a push block threadedly connected on the shaft body five, a one-way bearing arranged outside the push block, a pressing plate sleeved on the outer ring of the one-way bearing, a guide rod arranged in the working cavity and penetrating through the pressing plate, and a power component; the shaft body five is connected with the shaft body three through the third planetary gear set, and the shaft body five moves synchronously with the shaft body three; the pressing plate is slidingly connected on the guide rod, the clutch bearing of the second clutch is located on the movement path of the pressing plate, the shaft body five drives the push block and the pressing plate to move close to the second clutch when rotating, and the power component is used to drive the push block to move away from the second clutch.

[0013] By adopting the technical scheme, the shaft body two rotates to drive the shaft body five to rotate through the third planetary gear set, the shaft body five rotates to drive the push block to move close to the second clutch, the inner ring of the one-way bearing cannot rotate relative to the outer ring of the one-way bearing at this time, and the pressing plate cannot rotate due to the limitation of the guide rod, so that the power of the shaft body five rotating drives the push block, the one-way bearing and the pressing plate to move, so that the pressing plate moves close to the clutch bearing of the second clutch; after the power main shaft rotates 300 times, the pressing plate moves to press the clutch bearing of the second clutch, and the power connection between the shaft body two and the shaft body three is cut off. After the lubricating oil in the pump body is replaced, the oil replacement tank is pushed away from the transmission oil tank, and then the power component drives the push block to move back to the original position, the push block rotates back to the original position with the inner ring of the one-way bearing, the shaft body five does not rotate, and the pressing plate slides back to the original position.

[0014] Preferably, the power component comprises a push plate slidingly connected on the guide rod, a pull rod connected with the push plate and a pressing block, and a pressing rod hinged in the working cavity; the push plate is located on the side of the push block close to the transmission oil tank; the end of the pull rod extends out of the oil replacement tank; the top end of the pressing rod is located on the movement path of the pressing block, the pressing block drives the pressing rod to rotate when moving away from the transmission oil tank, so that the bottom end of the pressing rod presses the clutch bearing of the second clutch; the distance from the pressing block to the top end of the pressing rod is less than the distance from the push plate to the push block.

[0015] By adopting the technical scheme, when the oil needs to be replaced, the worker pulls the pull rod to make the push plate move away from the transmission oil tank. The push plate moves away from the transmission oil tank with the pressing block, and in this process, the pressing block first collides with the pressing rod to drive the pressing rod to rotate, so that the bottom end of the pressing rod presses the clutch bearing of the second clutch, to ensure that the shaft body three does not rotate. Subsequently, the push plate moves to collide with the push block and drives the push block to move away from the transmission tank, and when the push block moves away from the transmission tank, the push block rotates with the inner ring of the one-way bearing, while the pressing plate and the outer ring of the one-way bearing move away from the second clutch. After the pressing plate moves to the predetermined position, the worker pushes the pull rod back to make the push plate move back to the original position, so that the pressing block does not press the pressing rod, and the power connection between the shaft body two and the shaft body three is reconnected, and the components such as the plunger pump start to work to replace the old oil in the transmission tank.

[0016] The technical effects of the present application mainly embody in the following aspects:

[0017] 1. The present application can quickly complete the replacement of lubricating oil without stopping the pump body

[0018] 2. The present application completes the pumping operation of lubricating oil by converting the power of the pump body into the power of the first and second plunger pumps.

[0019] 3. The present application can actively control the oil replacement operation of the pump body. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the Roots vacuum pump of the present application.

[0021] Figure 2 is a partial structural schematic diagram of the Roots vacuum pump after the partial section of the oil replacement tank.

[0022] Figure 3 is Figure 2 a structural schematic diagram of the Roots vacuum pump from another angle.

[0023] Figure 4 is Figure 2 a structural schematic diagram of the Roots vacuum pump from another angle.

[0024] Figure 5 is Figure 4 a partial enlarged view of A in the Roots vacuum pump.

[0025] Figure 6 is Figure 2 a top view of the Roots vacuum pump.

[0026] Figure 7 is Figure 6 a partial sectional view of the Roots vacuum pump along the line B-B.

[0027] Figure 8 is Figure 3 a structural schematic diagram of C.

[0028] Reference signs: 1, pump body; 2, transmission oil tank; 21, first oil inlet pipe; 22, first oil outlet pipe; 3, quick oil changing device; 31, oil changing tank; 32, working cavity; 33, empty cavity; 34, oil storage cavity; 35, first plunger pump; 36, second plunger pump; 37, second oil inlet pipe; 38, second oil outlet pipe; 4, power mechanism; 41, power main shaft; 42, driven shaft; 43, driving assembly; 431, shaft body two; 432, shaft body three; 433, second clutch; 434, gear one; 435, gear two; 44, first clutch; 45, rotating disc; 46, hinge rod; 47, shaft body one; 48, abutting plate; 49, inclined surface; 5, abutting pressure part; 51, shaft body five; 52, push block; 53, one-way bearing; 54, pressing plate; 55, guide rod; 6, power component; 61, push plate; 62, pull rod; 63, abutting pressure block; 64, abutting pressure rod; 71, first planetary gear set; 72, second planetary gear set; 73, third planetary gear set. DETAILED DESCRIPTION

[0029] The application will be further described in detail below with reference to the accompanying drawings, so that the technical scheme of the application is easier to understand and master.

[0030] Reference Figures 1-3 The Roots vacuum pump with quick oil changing function of the embodiment includes a pump body 1, a transmission oil tank 2 installed on the pump body 1, and a quick oil changing device 3. The transmission oil tank 2 is provided with a first oil inlet pipe 21 and a first oil outlet pipe 22 which are in communication with the inner cavity of the transmission oil tank 2.

[0031] Reference Figures 1-3 The quick oil changing device 3 includes an oil changing tank 31 installed on the transmission tank, a working cavity 32, an empty cavity 33, and an oil storage cavity 34 provided in the oil changing tank 31. The oil storage cavity 34 is used for storing clean lubricating oil. Perforations which are in communication with the outside are formed in the cavity walls of the empty cavity 33 and the oil storage cavity 34. The perforations are blocked by rubber plugs which are threadedly connected in the perforations.

[0032] Reference Figures 1-3 The working cavity 32 is provided with a first plunger pump 35 and a second plunger pump 36. The oil changing tank 31 is provided with a second oil inlet pipe 37 and a second oil outlet pipe 38. One end of the second oil inlet pipe 37 is connected to the first oil outlet pipe 22 through a quick connector, and the other end of the second oil inlet pipe 37 is connected to the first plunger pump 35. When the first plunger pump 35 is started, the old oil in the transmission oil tank 2 is pumped into the first plunger pump 35 through the first oil outlet pipe 22 and the second oil inlet pipe 37, and then into the empty cavity 33. One end of the second oil outlet pipe 38 is connected to the first oil inlet pipe 21 through a quick connector, and the other end of the second oil outlet pipe 38 is connected to the second plunger pump 36. When the second plunger pump 36 is started, the lubricating oil in the oil storage cavity 34 is pumped into the second plunger pump 36, and then the clean lubricating oil is pumped into the transmission oil tank 2 through the second oil outlet pipe 38 and the first oil inlet pipe 21.

[0033] Referring to Figures 4-6 , the working cavity 32 is also provided with a power mechanism 4, which comprises a power main shaft 41 rotatably connected in the oil storage cavity 34, two driven shafts 42, two first clutches 44, two rotating discs 45 fixed on the ends of the two driven shafts 42 away from each other, two hinge rods 46 hingedly connected to the two rotating discs 45 respectively, a shaft body I 47 rotatably connected in the oil storage cavity 34, and two semicircular abutting plates 48 symmetrically installed on the shaft body I 47. The ends of the two hinge rods 46 away from the corresponding rotating discs 45 are hingedly connected to the piston rods of the first and second plunger pumps 35 and 36 respectively.

[0034] Referring to Figures 4-7 , the power mechanism 4 further comprises a driving assembly 43 for controlling the rotation of the power main shaft 41. The driving assembly 43 comprises a shaft body II 431 and a shaft body III 432 rotatably connected in the oil storage cavity 34, a second clutch 433 for connecting the shaft body II 431 and the shaft body III 432, a gear I 434 provided on the shaft body III 432, a gear II 435 provided on the power main shaft 41, and an abutting portion 5 for abutting against the clutch bearing of the second clutch 433. The gear I 434 is engaged with the gear II 435. The end of the shaft body II 431 away from the shaft body III 432 extends into the transmission oil tank 2 and is connected to the power shaft of the pump body 1 extending into the transmission oil tank 2 through the second planetary gear set 72. When the pump body 1 is in the starting state, the shaft body II 431 is always in the rotating state, and the rotation speed of the shaft body II 431 is reduced by the second planetary gear set 72.

[0035] Referring to Figures 4-6 , Referring to Figures 2-5 , the power main shaft 41 is connected with the shaft body I 47 through the first planetary gear set 71 and the gear II 435, and the power transmission between the power main shaft 41 and the shaft body I 47 is completed. The transmission ratio of the power main shaft 41 and the shaft body I 47 is 300:1, and the power main shaft 41 rotates 300 times while the shaft body I 47 rotates 1 time. The two first clutches 44 are mechanical clutches, and the two driven shafts 42 are installed on the two ends of the power main shaft 41 through the two first clutches 44. The deformation of the clutch spring on the first clutch 44 can cut off the power connection between the power main shaft 41 and the driven shaft 42 by pressing the clutch bearing of the first clutch 44.

[0036] Referring to Figures 4-6 , a slope 49 is formed on the clutch bearing of each of the two first clutches 44, and the two slopes 49 are located on the rotating paths of the two abutting plates 48 respectively. The abutting plates 48 rotate to abut against the slopes 49 to drive the clutch bearings of the first clutches 44 to move, thereby cutting off the power connection between the power main shaft 41 and the driven shaft 42. When the shaft body I 47 rotates, the two abutting plates 48 abut against the two slopes 49 alternately.

[0037] Referring to Figures 4-6 , in the initial state, the abutting plate 48 close to the second plunger pump 36 abuts against the clutch bearing of the first clutch 44 close to the second plunger pump 36, so that the power between the driven shaft 42 connected with the second plunger pump 36 and the power main shaft 41 is in the disconnected state. The abutting plate 48 close to the first plunger pump 35 does not abut against the clutch bearing of the first clutch 44 in the movement path, so that the power between the driven shaft 42 connected with the first plunger pump 35 and the power main shaft 41 is in the connected state.

[0038] Referring to Figure 3 , Figure 4 and Figure 8 , the power mechanism 4 further comprises an abutting part 5 for abutting against the clutch bearing of the second clutch 433. The abutting part 5 comprises a shaft body five 51 rotatably connected in the oil storage cavity 34, a push block 52 threadedly connected on the shaft body five 51, a one-way bearing 53 arranged outside the push block 52, a pressure plate 54 sleeved on the outer ring of the one-way bearing 53, and two guide rods 55 fixed in the working cavity 32 and penetrating through the pressure plate 54.

[0039] Referring to Figure 3 , Figure 7 and Figure 8 , the shaft body five 51 is connected with the shaft body three 432 through the third planetary gear set 73 and the first gear, so as to complete the power transmission between the shaft body three 432 and the shaft body five 51. The pressure plate 54 is slidingly connected with the guide rods 55 along the length direction of the shaft five, and the one-way bearing 53 is arranged to allow the push block 52 to reverse relative to the pressure plate 54. The second clutch 433 is located on the side of the pressure plate 54 close to the transmission oil tank 2, the clutch bearing of the second clutch 433 is located in the movement path of the pressure plate 54, the second clutch 433 is a mechanical clutch, and pressing the clutch bearing of the second clutch 433 will cut off the power connection between the shaft body two 431 and the shaft body three 432.

[0040] Referring to Figure 3 , Figure 7 and Figure 8 , when the shaft body five 51 rotates, the push block 52 and the inner ring of the one-way bearing 53 rotate forward, and under normal circumstances, the outer ring of the one-way bearing 53 and the pressure plate 54 rotate forward, but the pressure plate 54 will not rotate due to the limitation of the guide rods 55, so that the shaft body five 51 drives the push block 52, the one-way bearing 53 and the pressure plate 54 to move when rotating, so that the pressure plate 54 is close to the second clutch 433. The axes of the power main shaft 41, the two driven shafts 42, the shaft body one 47, the shaft body two 431, the shaft body three 432 and the shaft body five 51 are parallel.

[0041] Referring to Figure 3 , Figure 7and Figure 8 The power mechanism 4 further comprises a power component 6 for pushing the push block 52 to move away from the second clutch 433. The power component 6 comprises a push plate 61 connected to the two guide rods 55, a pull rod 62 connected to the push plate 61, a pressing block 63, and a pressing rod 64 hinged in the working cavity 32.

[0042] Referring to Figure 3 , Figure 7 and Figure 8 , the push plate 61 is located on the side of the push block 52 close to the transmission oil tank 2, the end of the pull rod 62 away from the push block 52 extends out of the oil tank 31. The pressing rod 64 is located above the shaft body three 432, the clutch bearing of the second clutch 433 is located in the rotation path of the bottom end of the pressing rod 64, and the top end of the pressing rod 64 is located in the movement path of the pressing block 63. When the pressing block 63 moves away from the transmission oil tank 2, it pushes the pressing rod 64 to rotate, so that the bottom end of the pressing rod 64 presses the clutch bearing of the second clutch 433. The distance between the pressing block 63 and the top end of the pressing rod 64 in the initial state is less than the distance between the push plate 61 and the push block 52.

[0043] The oil change steps of the pump body 1 are as follows:

[0044] When the lubricating oil in the transmission oil tank 2 needs to be replaced, the worker pulls the pull rod 62, so that the push plate 61 moves away from the transmission oil tank 2. When the push plate 61 moves away from the transmission oil tank 2, the pressing block 63 will move together. During this process, the pressing block 63 first collides with the pressing rod 64 to drive the pressing rod 64 to rotate, so that the bottom end of the pressing rod 64 presses the clutch bearing of the second clutch 433, ensuring that the shaft body three 432 will not rotate.

[0045] Subsequently, the push plate 61 will move to collide with the push block 52 and push the push block 52 to move away from the transmission tank. When the push block 52 moves away from the transmission tank, the push block 52 will rotate with the inner ring of the one-way bearing 53, and the pressing plate 54 and the outer ring of the one-way bearing 53 will move away from the second clutch 433.

[0046] After the pressing plate 54 moves to the predetermined position, the worker pushes the pull rod 62 back to move the push plate 61 to reset, so that the pressing block 63 does not press the pressing rod 64, and the power connection between the shaft body two 431 and the shaft body three 432 is reconnected. The shaft body three 432 is turned on and rotates.

[0047] When the shaft body three 432 rotates, it drives the power spindle 41 and the shaft body five 51 to rotate. When the power spindle 41 rotates, it will drive the piston of the first plunger pump 35 to reciprocate through the driven shaft 42 and other structures, so that the first plunger pump 35 pumps the old oil in the transmission oil tank 2 into the cavity 33. When the power spindle 41 rotates, it will also drive the shaft body one 47 to rotate through the first planetary gear set 71. The power spindle 41 rotates 300 times, and the shaft body one 47 rotates 1 turn.

[0048] After the power spindle 41 rotates 150 rounds, the pressing state of the two plates 48 and the two inclined surfaces 49 is exchanged, the bottom plate originally pressing the inclined surface 49 rotates to not abut the inclined surface 49, and the plate 48 originally pressing the inclined surface 49 rotates to abut the inclined surface 49, so that the power connection between the first plunger pump 35 and the power spindle 41 is disconnected, and the power connection between the second plunger pump 36 and the power spindle 41 is continued. When the power spindle 41 rotates subsequently, the piston of the second plunger pump 36 reciprocates, so that the second plunger pump 36 pumps the new oil in the oil storage cavity 34 into the transmission oil tank 2, and the new oil is filled.

[0049] When the shaft body five 51 rotates, the push block 52 is driven to move close to the second clutch 433, and after the power spindle 41 rotates 300 rounds, the pressing plate 54 moves to abut the clutch bearing of the second clutch 433, and the power connection between the shaft body two 431 and the shaft body three 432 is disconnected. At the same time, the pressing state of the two plates 48 and the two inclined surfaces 49 is exchanged again, and the initial state is restored, the power connection between the first plunger pump 35 and the power spindle 41 is reconnected, and the power connection between the second plunger pump 36 and the power spindle 41 is disconnected again.

[0050] Of course, the above is only a typical example of the present application, in addition to this, the present application can have other various specific embodiments, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A Roots vacuum pump with quick oil change function, comprising a pump body (1) and a transmission oil tank (2) arranged on the pump body (1), characterized in that: The quick oil changing device (3) comprises an oil changing tank (31) arranged on the pump body (1), a working cavity (32), a cavity (33) and an oil storage cavity (34) arranged in the oil changing tank (31), the working cavity (32) is provided with a first plunger pump (35), a second plunger pump (36) and a power mechanism (4), the first plunger pump (35) is used for pumping old oil in the transmission oil tank (2) into the cavity (33), the second plunger pump (36) is used for pumping new oil in the oil storage cavity (34) into the transmission oil tank (2), the power mechanism (4) comprises a power main shaft (41) rotatably connected in the oil storage cavity (34), two driven shafts (42), a driving assembly (43) used for controlling rotation of the power main shaft (41), two first clutches (44) used for connecting the power main shaft (41) and the two driven shafts (42), two rotating discs (45) arranged on the two driven shafts (42) respectively, two hinge rods (46) hingedly connected on the two rotating discs (45) respectively, a shaft body one (47) rotatably connected in the oil storage cavity (34), and two semicircular resisting plates (48) symmetrically arranged on the shaft body one (47), the two hinge rods (46) are respectively hingedly connected with piston rods of the first plunger pump (35) and the second plunger pump (36), the power main shaft (41) is connected with the shaft body one (47) through a first planetary gear set (71), the two first clutches (44) are respectively provided with inclined surfaces (49) on clutch bearings, the two inclined surfaces (49) are respectively located on rotating paths of the two resisting plates (48), the resisting plates (48) are rotated to press the inclined surfaces (49) to drive the clutch bearings of the first clutches (44) to move, so that the power connection between the power main shaft (41) and the driven shafts (42) is cut off, and the two resisting plates (48) are staggered to press the two inclined surfaces (49) when the shaft body one (47) rotates.

2. The Roots vacuum pump with quick oil change function according to claim 1, characterized in that: The transmission oil tank (2) is provided with a first oil inlet pipe (21) and a first oil outlet pipe (22) communicated with an inner cavity of the transmission oil tank (2), the oil changing tank (31) is provided with a second oil inlet pipe (37) and a second oil outlet pipe (38), the second oil inlet pipe (37) and the first oil outlet pipe (22) are connected through a quick connector, the second oil outlet pipe (38) and the first oil inlet pipe (21) are connected through a quick connector, the second oil inlet pipe (37) is connected with the first plunger pump (35), and the second oil outlet pipe (38) is connected with the second plunger pump (36).

3. The Roots vacuum pump with quick oil change function according to claim 2, characterized in that: The driving assembly (43) comprises a shaft body two (431) and a shaft body three (432) rotatably connected in the oil storage cavity (34), a second clutch (433) for connecting the shaft body two (431) and the shaft body three (432), a gear one (434) arranged on the shaft body three (432), a gear two (435) arranged on the power spindle (41), a pressing part (5) for pressing the clutch bearing of the second clutch (433), and the gear one (434) is engaged with the gear two (435); the shaft body two (431) is deep into the transmission oil tank (2) away from the shaft body three (432) and is connected with the power shaft of the pump body (1) extending into the transmission oil tank (2) through the second planetary gear set (72).

4. The Roots vacuum pump with quick oil change function according to claim 3, characterized in that: The pressing part (5) comprises a shaft body five (51) rotatably connected in the oil storage cavity (34), a push block (52) threadedly connected on the shaft body five (51), a one-way bearing (53) arranged outside the push block (52), a pressing plate (54) sleeved on the outer ring of the one-way bearing (53), a guide rod (55) arranged in the working cavity (32) and penetrating through the pressing plate (54), and a power component (6), the shaft body five (51) is connected with the shaft body three (432) through the third planetary gear set (73), and the shaft body five (51) moves synchronously with the shaft body three (432); the pressing plate (54) is slidingly connected on the guide rod (55), the clutch bearing of the second clutch (433) is located on the movement path of the pressing plate (54), the shaft body five (51) drives the push block (52) and the pressing plate (54) to move close to the second clutch (433) when rotating, and the power component (6) is used for driving the push block (52) to move away from the second clutch (433).

5. The Roots vacuum pump with quick oil change function according to claim 4, characterized in that: The power component (6) comprises a push plate (61) slidingly connected on the guide rod (55), a pull rod (62) and a pressing block (63) connected with the push plate (61), and a pressing rod (64) hinged in the working cavity (32); the push plate (61) is located on the side of the push block (52) close to the transmission oil tank (2); the end of the pull rod (62) extends out of the oil tank (31); the top end of the pressing rod (64) is located on the movement path of the pressing block (63), the pressing block (63) drives the pressing rod (64) to rotate when moving away from the transmission oil tank (2), so that the bottom end of the pressing rod (64) presses the clutch bearing of the second clutch (433); the distance from the pressing block (63) to the top end of the pressing rod (64) is less than the distance from the push plate (61) to the push block (52).

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