Roots vacuum pump with quick oil change function

Abstract

The invention relates to a roots vacuum pump with a quick oil change function, which comprises a pump body, a transmission oil tank arranged on the pump body and a quick oil change device capable of being separated from the transmission oil tank. The lubricating oil can be quickly replaced under the condition that the pump body is not stopped.

Description

Technical Field

[0001] The present invention relates to the field of vacuum pumps, and particularly to a Roots vacuum pump with a rapid oil change function. Background Art

[0002] A Chinese patent with the publication number CN118167639B discloses a Roots vacuum pump with a rapid oil change function, which includes a pump body, a driving motor and a transmission oil tank arranged at both 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. It is proposed that sometimes the Roots vacuum pump needs to be shut down according to lubrication requirements, and then the old lubricating oil in the transmission oil tank is drained, and the new lubricating oil is poured into the transmission oil tank. Therefore, the process of lubricating oil replacement is relatively cumbersome, so it is necessary to design a structure to achieve rapid oil change of the Roots vacuum pump. Summary of the Invention

[0004] The present application provides a Roots vacuum pump with a rapid oil change function, which can quickly complete the replacement of lubricating oil without shutting down the pump body.

[0005] The Roots vacuum pump with a rapid oil change function provided by the present application adopts the following technical solutions: A Roots vacuum pump with a rapid oil change function includes a pump body, a transmission oil tank arranged on the pump body, and a rapid oil change device. The rapid oil change device includes an oil change tank arranged on the pump body, a working chamber, a cavity and an oil storage chamber arranged in the oil change tank. A first plunger pump, a second plunger pump and a power mechanism are arranged in the working chamber. The first plunger pump is used to pump the old oil in the transmission oil tank into the cavity, and the second plunger pump is used to pump the new oil in the oil storage chamber into the transmission oil tank. The power mechanism includes a power main shaft rotatably connected in the oil storage chamber, two driven shafts, a driving component for controlling the rotation of the power main shaft, two first clutches for connecting the power main shaft and the two driven shafts, two turntables respectively arranged on the two driven shafts, two hinge rods respectively hinged on the two turntables, a shaft body one rotatably connected in the oil storage chamber, and two semi-circular pressing plates symmetrically arranged on the shaft body one. The two hinge rods are respectively hinged with the piston rods of the first plunger pump and the second plunger pump. The power main shaft is connected with the shaft body one through a first planetary gear set. Bevels are formed on the clutch bearings of the two first clutches, and the two bevels are respectively located on the rotation paths of the two pressing plates. When the pressing plates rotate, they will press against the bevels to drive the movement of the clutch bearings of the first clutches, thereby cutting off the power connection between the power main shaft and the driven shafts. When the shaft body one rotates, the two pressing plates alternately press against the two bevels.

[0006] By adopting the above technical solution, in the initial state, the pressing plate close to the second plunger pump presses against the clutch bearing of the first clutch close to the second plunger pump, so that the power between the driven shaft connected to the second plunger pump and the power main shaft is disconnected, and the second plunger pump will not start. When oil needs to be changed, the driving component drives the power main shaft to rotate. When the power main shaft rotates, it will drive the piston of the first plunger pump to reciprocate through structures such as the driven shaft, so that the first plunger pump pumps the old oil in the transmission oil tank into the cavity. When the power main shaft rotates, it will also drive the shaft body one to rotate through the first planetary gear set. When the power main shaft rotates 300 circles, the shaft body one rotates 1 circle. After the power main shaft rotates 150 circles, the pressing states of the two pressing plates and the two inclined surfaces are exchanged, the power connection between the first plunger pump and the power main shaft is disconnected, and the power connection between the second plunger pump and the power main shaft is continued. When the power main shaft rotates, it will 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 to complete the filling of the new oil.

[0007] Preferably, a first inlet pipe and a first outlet pipe communicating with the inner cavity are provided on the transmission oil tank, a second inlet pipe and a second outlet pipe are provided on the oil change tank, the second inlet pipe is connected to the first outlet pipe through a quick connector, the second outlet pipe is connected to the first inlet pipe through a quick connector, the second inlet pipe is connected to the first plunger pump, and the second outlet pipe is connected to the second plunger pump.

[0008] By adopting the above technical solution, it is convenient to connect the pipelines.

[0009] Preferably, the driving component includes a shaft body two and a shaft body three rotatably 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 a pressing part for pressing the clutch bearing of the second clutch; the gear one meshes with the gear two; one end of the shaft body two away from the shaft body three extends into the transmission oil tank and is connected to the power shaft of the pump body extending into the transmission oil tank through a second planetary gear set.

[0010] By adopting the above technical solution, the pump body can change oil without stopping. When the pump body is in the starting state, the shaft body two is always in a rotating state. When oil needs to be changed, the pressing of the pressing part on the clutch bearing of the second clutch is cancelled, so that when the shaft body two rotates, it drives the shaft body three to rotate, and the shaft body three rotates to drive the power main shaft to rotate. After the power main shaft rotates 300 circles, the pressing part presses the clutch bearing of the second clutch to cut off the connection between the shaft body two and the shaft body three, so that the power main shaft stops rotating.

[0011] Preferably, the pressing part includes a fifth shaft rotatably connected in the oil storage cavity, a push block threadedly connected to the fifth shaft, a one-way bearing disposed outside the push block, a pressing plate sleeved on the outer ring of the one-way bearing, a guiding rod disposed in the working cavity and passing through the pressing plate, and a power component. The fifth shaft is connected to the third shaft through a third planetary gear set, and the fifth shaft and the third shaft move synchronously. The pressing plate is slidably connected to the guiding rod, and the clutch bearing of the second clutch is located on the movement path of the pressing plate. When the fifth shaft rotates, it drives the push block and the pressing plate to move closer to the second clutch, and the power component is used to push the push block to move away from the second clutch.

[0012] By adopting the above technical solution, when the second shaft rotates, it will drive the fifth shaft to rotate through the third planetary gear set. When the fifth shaft rotates, it will drive the push block to move closer to the second clutch. At this time, the inner ring of the one-way bearing will not rotate relative to the outer ring of the one-way bearing, and at the same time, due to the restriction of the guiding rod, the pressing plate will not rotate. Then the power of the rotation of the fifth shaft will drive the push block, the one-way bearing and the pressing plate to move, so that the pressing plate moves closer to the second clutch. After the power main shaft rotates 300 circles, the pressing plate moves to press the clutch bearing of the second clutch, cutting off the power connection between the second shaft and the third shaft. After the lubricating oil of a pump body is changed, the oil change tank is pushed away from the transmission oil tank, and then the power component pushes the push block to move back to its original position. The push block will drive the inner ring of the one-way bearing to rotate back to its original position. The fifth shaft does not rotate, while the pressing plate slides back to its original position.

[0013] Preferably, the power component includes a push plate slidably connected to the guiding rod, a pull rod connected to the push plate, 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 change tank. The top end of the pressing rod is located on the movement path of the pressing block. When the pressing block moves away from the transmission oil tank, it pushes the pressing rod to rotate, 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.

[0014] By adopting the above technical solution, when oil change is needed, the worker pulls the pull rod, causing the push plate to move away from the transmission oil tank. When the push plate moves away from the transmission oil tank, it will drive the pressing block to move together. In this process, the pressing block first collides with the pressing rod, driving the pressing rod to rotate so that the bottom end of the pressing rod presses the clutch bearing of the second clutch, ensuring that the third shaft will not rotate. Subsequently, the push plate will move to collide with the push block and push the push block to move away from the transmission box. When the push block moves away from the transmission box, the push block will drive the inner ring of the one-way bearing to rotate, while the pressing plate and the outer ring of the one-way bearing move translationally away from the second clutch. After the pressing plate moves to a predetermined position, the worker pushes the pull rod back to make the push plate move back to its original position, and finally the pressing block no longer presses the pressing rod, and the power connection between the second shaft and the third shaft is reconnected. Components such as the plunger pump start to work to perform the oil change operation on the old oil in the transmission box.

[0015] The technical effects of the present invention are mainly reflected in the following aspects: 1. The present invention can quickly complete the replacement of lubricating oil without stopping the pump body. 2. The present invention completes the pumping operation of lubricating oil by converting the power of the pump body into the power of the first plunger pump and the second plunger pump. 3. The present invention can actively control the oil change operation of the pump body. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the roots vacuum pump of the present application.

[0017] Figure 2 is a partial structural schematic diagram of the roots vacuum pump after partial dissection of the oil change tank.

[0018] Figure 3 is Figure 2 a schematic structural diagram of the roots vacuum pump from another angle in

[0019] Figure 4 is Figure 2 a schematic structural diagram of the roots vacuum pump from another angle in

[0020] Figure 5 is Figure 4 a partial enlarged view of part A in

[0021] Figure 6 is Figure 2 a top view of the roots vacuum pump in..

[0022] Figure 7 is Figure 6 a partial sectional view of the roots vacuum pump along line B-B in

[0023] Figure 8 is Figure 3 a schematic structural diagram of part C in

[0024] Reference numerals: 1, pump body; 2, transmission oil tank; 21, first oil inlet pipe; 22, first oil outlet pipe; 3, quick oil change device; 31, oil change tank; 32, working chamber; 33, cavity; 34, oil storage chamber; 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, drive assembly; 431, shaft body two; 432, shaft body three; 433, second clutch; 434, gear one; 435, gear two; 44, first clutch; 45, turntable; 46, hinge rod; 47, shaft body one; 48, pressing plate; 49, inclined surface; 5, pressing 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, pressing block; 64, pressing rod; 71, first planetary gear set; 72, second planetary gear set; 73, third planetary gear set. Detailed implementation manners

[0025] The present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solutions of the present application can be more easily understood and mastered.

[0026] Referring to Figures 1 - 3 , a Roots vacuum pump with a quick oil change function in this embodiment includes a pump body 1, a transmission oil tank 2 installed on the pump body 1, and a quick oil change device 3. A first oil inlet pipe 21 and a first oil outlet pipe 22 that communicate with its inner cavity are installed on the transmission oil tank 2.

[0027] Referring to Figures 1 - 3 , the quick oil change device 3 includes an oil change tank 31 installed on the transmission box, a working chamber 32, a cavity 33, and an oil storage chamber 34 provided in the oil change tank 31. The oil storage chamber 34 is used to store clean lubricating oil. Through holes communicating with the outside are opened on the cavity walls of the cavity 33 and the oil storage chamber 34, and the through holes are blocked by screwing rubber plugs into the through holes.

[0028] Referring to Figures 1 - 3 , a first plunger pump 35 and a second plunger pump 36 are installed in the working chamber 32. A second oil inlet pipe 37 and a second oil outlet pipe 38 are installed on the oil change tank 31. 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 will be pumped into it through the first oil outlet pipe 22 and the second oil inlet pipe 37, and then pumped into the 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 chamber 34 will be pumped into it, and then the clean lubricating oil will be pumped into the transmission oil tank 2 through the second oil outlet pipe 38 and the first oil inlet pipe 21.

[0029] Refer to Figures 4 - 6 , a power mechanism 4 is further provided in the working chamber 32. The power mechanism 4 includes a power main shaft 41 rotatably connected in the oil storage chamber 34, two driven shafts 42, two first clutches 44, two turntables 45 respectively fixed on the mutually remote ends of the two driven shafts 42, two hinge rods 46 respectively hinged on the two turntables 45, a first shaft body 47 rotatably connected in the oil storage chamber 34, and two semi-circular pressing plates 48 symmetrically installed on the first shaft body 47. The ends of the two hinge rods 46 remote from the corresponding turntables 45 are respectively hinged to the piston rods of the first plunger pump 35 and the second plunger pump 36.

[0030] Refer to Figures 4 - 7 , the power mechanism 4 further includes a drive assembly 43 for controlling the rotation of the power main shaft 41. The drive assembly 43 includes a second shaft body 431 and a third shaft body 432 rotatably connected in the oil storage chamber 34, a second clutch 433 for connecting the second shaft body 431 and the third shaft body 432, a first gear 434 provided on the third shaft body 432, a second gear 435 provided on the power main shaft 41, and a pressing portion 5 for pressing the clutch bearing of the second clutch 433. The first gear 434 meshes with the second gear 435; one end of the second shaft body 431 remote from the third shaft body 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 a second planetary gear set 72. When the pump body 1 is in the starting state, the second shaft body 431 is always in the rotating state, and the rotation speed of the second shaft body 431 is reduced by setting the second planetary gear set 72.

[0031] Refer to Figures 4 - 6 Refer to Figures 2 - 5 , the power main shaft 41 is connected to the first shaft body 47 through a first planetary gear set 71 and the second gear 435 to complete the power transmission between the power main shaft 41 and the first shaft body 47. The transmission ratio between the power main shaft 41 and the first shaft body 47 is 300:1. When the power main shaft 41 rotates 300 circles, the first shaft body 47 rotates 1 circle. Both of the two first clutches 44 are mechanical clutches. The two driven shafts 42 are installed at both ends of the power main shaft 41 through the two first clutches 44. Pressing the clutch bearing of the first clutch 44 to deform 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.

[0032] Refer to Figures 4 - 6 , inclined surfaces 49 are respectively provided on the clutch bearings of the two first clutches 44. The two inclined surfaces 49 are respectively located on the rotation paths of the two pressing plates 48. When the pressing plates 48 rotate, they will press the inclined surfaces 49 to drive the movement of the clutch bearings of the first clutches 44 so as to cut off the power connection between the power main shaft 41 and the driven shafts 42; when the first shaft body 47 rotates, the two pressing plates 48 alternately press the two inclined surfaces 49.

[0033] Reference Figures 4 - 6 , in the initial state, the pressing plate 48 close to the second plunger pump 36 presses 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 to the second plunger pump 36 and the power main shaft 41 is in a disconnected state. The pressing plate 48 close to the first plunger pump 35 does not press against the clutch bearing of the first clutch 44 on its movement path. Therefore, the power between the driven shaft 42 connected to the first plunger pump 35 and the power main shaft 41 is in a connected state.

[0034] Reference Figure 3 、 Figure 4 and Figure 8 , the power mechanism 4 further includes a pressing portion 5 for pressing against the clutch bearing of the second clutch 433. The pressing portion 5 includes a shaft body five 51 rotatably connected in the oil storage chamber 34, a push block 52 threadedly connected to the shaft body five 51, a one-way bearing 53 provided outside the push block 52, a pressing plate 54 sleeved on the outer ring of the one-way bearing 53, and two guide rods 55 fixed in the working chamber 32 and passing through the pressing plate 54.

[0035] Reference Figure 3 、 Figure 7 and Figure 8 , the shaft body five 51 is connected to the shaft body three 432 through the third planetary gear set 73 and the first gear to complete the power transmission between the shaft body three 432 and the shaft body five 51. The pressing plate 54 is slidably connected to the guide rods 55 along the length direction of the shaft five, and the one-way bearing 53 is provided to only allow the push block 52 to reverse relative to the pressing plate 54. The second clutch 433 is located on the side of the pressing plate 54 close to the transmission oil tank 2, and the clutch bearing of the second clutch 433 is on the movement path of the pressing 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.

[0036] Reference Figure 3 、 Figure 7 and Figure 8 , when the shaft body five 51 rotates, it drives the push block 52 and the inner ring of the one-way bearing 53 to rotate forward. When the inner ring of the one-way bearing 53 rotates forward, normally the outer ring of the one-way bearing 53 and the pressing plate 54 rotate forward. However, due to the limitation of the guide rods 55, the pressing plate 54 will not rotate. Then, when the shaft body five 51 rotates, it will drive the push block 52, the one-way bearing 53 and the pressing plate 54 to move, so that the pressing plate 54 approaches the second clutch 433. In this application, 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 all parallel.

[0037] Reference Figure 3 、 Figure 7and Figure 8 The power mechanism 4 further includes a power component 6 for pushing the push block 52 to move away from the second clutch 433. The power component 6 includes a push plate 61 slidably connected to 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 chamber 32.

[0038] Referring to Figure 3 and Figure 7 and Figure 8 Among them, the push plate 61 is located on the side of the push block 52 close to the transmission oil tank 2, and the end of the pull rod 62 away from the push block 52 extends out of the oil change tank 31. The pressing rod 64 is located above the shaft body three 432, and the clutch bearing of the second clutch 433 is located on the rotation path of the bottom end of the pressing rod 64, and the top end of the pressing rod 64 is located on 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. In the initial state, 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.

[0039] The oil change steps of the pump body 1 of the present application are as follows: 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, it will drive the pressing block 63 to move together. In 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 does not rotate.

[0040] 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 box. When the push block 52 moves away from the transmission box, the inner ring of the one-way bearing 53 will rotate with the push block 52, while the pressure plate 54 and the outer ring of the one-way bearing 53 will move translationally away from the second clutch 433.

[0041] After the pressure plate 54 moves to the predetermined position, the worker pushes the pull rod 62 back to reset the push plate 61, and finally the pressing block 63 no longer presses 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 starts to rotate.

[0042] When the shaft body three 432 rotates, it will drive the power main shaft 41 and the shaft body five 51 to rotate. When the power main shaft 41 rotates, it will drive the piston of the first plunger pump 35 to reciprocate through structures such as the driven shaft 42, so that the first plunger pump 35 pumps the old oil in the transmission oil tank 2 into the cavity 33. When the power main shaft 41 rotates, it will also drive the shaft body one 47 to rotate through the first planetary gear set 71. When the power main shaft 41 rotates 300 circles, the shaft body one 47 rotates 1 circle.

[0043] After the power main shaft 41 rotates 150 times, the two plates 48 and the two inclined surfaces 49 exchange their pressing states, the bottom plate that originally pressed the inclined surface 49 rotates to not contact the inclined surface 49, and the plate 48 that originally pressed the inclined surface 49 rotates to contact the inclined surface 49, thereby disconnecting the power connection between the first plunger pump 35 and the power main shaft 41, and reconnecting the power connection between the second plunger pump 36 and the power main shaft 41. When the power main shaft 41 rotates later, it will carry the piston of the second plunger pump 36 to reciprocate, so that the second plunger pump 36 will pump the new oil in the oil storage chamber 34 into the transmission oil tank 2, completing the filling of the new oil.

[0044] When the shaft body 51 rotates, it drives the push block 52 to move close to the second clutch 433. After the power main shaft 41 rotates 300 times, the pressure plate 54 moves to press the clutch bearing of the second clutch 433, cutting off the power connection between the shaft body 2 431 and the shaft body 3 432. At the same time, the pressing state of the two plates 48 and the two inclined surfaces 49 is exchanged and restored to the initial state, the power connection between the first plunger pump 35 and the power main shaft 41 is resumed, and the power of the second plunger pump 36 and the power main shaft 41 is disconnected again.

[0045] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A Roots vacuum pump with a function of quickly changing oil, comprising a pump body (1) and a transmission oil tank (2) arranged on the pump body (1), characterized in that: It further includes a quick oil change device (3). The quick oil change device (3) includes an oil change tank (31) provided on the pump body (1), a working chamber (32), a cavity (33), and an oil storage chamber (34) provided in the oil change tank (31). A first plunger pump (35), a second plunger pump (36), and a power mechanism (4) are provided in the working chamber (32). The first plunger pump (35) is used to pump the old oil in the transmission oil tank (2) into the cavity (33), and the second plunger pump (36) is used to pump the new oil in the oil storage chamber (34) into the transmission oil tank (2). The power mechanism (4) includes a power main shaft (41) rotatably connected in the oil storage chamber (34), two driven shafts (42), a driving component (43) for controlling the rotation of the power main shaft (41), two first clutches (44) for connecting the power main shaft (41) and the two driven shafts (42), two turntables (45) respectively provided on the two driven shafts (42), two hinge rods (46) respectively hinged on the two turntables (45), a shaft body one (47) rotatably connected in the oil storage chamber (34), and two semi-circular pressing plates (48) symmetrically provided on the shaft body one (47). The two hinge rods (46) are respectively hinged to the piston rods of the first plunger pump (35) and the second plunger pump (36). The power main shaft (41) is connected to the shaft body one (47) through a first planetary gear set (71). Chamfers (49) are provided on the clutch bearings of the two first clutches (44). The two chamfers (49) are respectively located on the rotation paths of the two pressing plates (48). When the pressing plates (48) rotate, they will press against the chamfers (49) to drive the movement of the clutch bearings of the first clutches (44) so as to cut off the power connection between the power main shaft (41) and the driven shafts (42). When the shaft body one (47) rotates, the two pressing plates (48) alternately press against the two chamfers (49).

2. The roots vacuum pump with a rapid oil change function according to claim 1, characterized in that: A first inlet pipe (21) and a first outlet pipe (22) communicating with its inner cavity are provided on the transmission oil tank (2). A second inlet pipe (37) and a second outlet pipe (38) are provided on the oil change tank (31). The second inlet pipe (37) and the first outlet pipe (22) are connected by a quick connector. The second outlet pipe (38) and the first inlet pipe (21) are connected by a quick connector. The second inlet pipe (37) is connected to the first plunger pump (35), and the second outlet pipe (38) is connected to the second plunger pump (36).

3. The roots vacuum pump with a fast oil change function according to claim 2, characterized in that: The driving component (43) includes a second shaft body (431) rotatably connected in the oil storage cavity (34), a third shaft body (432), a second clutch (433) for connecting the second shaft body (431) and the third shaft body (432), a first gear (434) provided on the third shaft body (432), a second gear (435) provided on the power main shaft (41), and a pressing portion (5) for pressing the clutch bearing of the second clutch (433). The first gear (434) meshes with the second gear (435). One end of the second shaft body (431) away from the third shaft body (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 a second planetary gear set (72).

4. A Roots vacuum pump with a fast oil change function according to claim 3, characterized in that: The pressing portion (5) includes a fifth shaft body (51) rotatably connected in the oil storage cavity (34), a push block (52) threadedly connected to the fifth shaft body (51), a one-way bearing (53) provided outside the push block (52), a pressing plate (54) sleeved on the outer ring of the one-way bearing (53), a guiding rod (55) provided in the working cavity (32) and passing through the pressing plate (54), and a power component (6). The fifth shaft body (51) is connected to the third shaft body (432) through a third planetary gear set (73), and the fifth shaft body (51) and the third shaft body (432) move synchronously. The pressing plate (54) is slidably connected to the guiding rod (55). The clutch bearing of the second clutch (433) is located on the movement path of the pressing plate (54). When the fifth shaft body (51) rotates, it drives the push block (52) and the pressing plate (54) to move closer to the second clutch (433). The power component (6) is used to push the push block (52) to move away from the second clutch (433).

5. The roots vacuum pump with a fast oil change function according to claim 4, characterized in that: The power component (6) includes a push plate (61) slidably connected to the guiding rod (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). 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 change tank (31). The top end of the pressing rod (64) is located on 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 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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