Three-shaft mixing pump

Abstract

The utility model discloses a three-shaft mixing pump which is characterized in that the three-shaft mixing pump comprises a pump body, a middle connecting shaft, a first connecting shaft and a second connecting shaft, and a first-stage roots pump body cavity, a second-stage roots pump body cavity and a screw pump body cavity which are mutually independent are sequentially arranged in the pump body; two first-stage roots rotor parts which are meshed with each other are arranged in a cavity of the first-stage roots pump body, and the two first-stage roots rotor parts are mounted on the middle connecting shaft and the first connecting shaft respectively; two second-stage roots rotor parts which are meshed with each other are arranged in a cavity of the second-stage roots pump body, and the two second-stage roots rotor parts are mounted on the middle connecting shaft and the second connecting shaft respectively; and two screw rotor parts which are meshed with each other are arranged in a cavity of the screw pump body and are respectively mounted on the middle connecting shaft and the first connecting shaft. According to the utility model, the vacuumizing effect is improved, the energy consumption is reduced, the occupied space is also reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to a vacuum pump, in particular to a three-axis mixing pump. Background Art

[0002] There are many types of vacuum pumps, and different vacuum pumps are used in different industries. For example, Roots vacuum pumps and screw vacuum pumps can be used alone or in combination. When used in combination, in the conventional way, such as patent number: CN202121962223.8, patent name: Based on industrial high-efficiency and energy-saving Roots screw vacuum pump group, this structure has the following shortcomings:

[0003] 1. The screw pump is set below the Roots pump, which takes up a lot of space;

[0004] 2. Both Roots pumps and screw pumps require a separate motor to drive them, which is not only more expensive, but also consumes more energy;

[0005] 3. The air outlet temperature of the screw pump is high and it is easy to be damaged. At the same time, in a dusty environment, it is prone to dust clogging and the maintenance rate is relatively high. Summary of the invention

[0006] The utility model aims to provide a three-axis mixing pump. By using the structure, the space occupation can be reduced, the vacuum effect can be guaranteed, the maintenance rate can be reduced, the service life can be extended, and the assembly difficulty can be reduced.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a three-axis mixing pump, comprising a pump body and a connecting shaft rotatably installed in the pump body;

[0008] The pump body is provided with a first-stage Roots pump body cavity, a second-stage Roots pump body cavity and a screw pump body cavity which are independent of each other in sequence along the axial direction of the connecting shaft;

[0009] The pump body is provided with an air inlet, an air outlet, an intermediate connecting channel and a connecting channel, the air inlet connects the first-stage Roots pump body cavity with the outside atmosphere, the air outlet connects the screw pump body cavity with the outside atmosphere, the intermediate connecting channel connects the first-stage Roots pump body cavity with the second-stage Roots pump body cavity, and the connecting channel connects the second-stage Roots pump body cavity with the screw pump body cavity;

[0010] The connecting shaft comprises an intermediate connecting shaft, and a first connecting shaft and a second connecting shaft which are respectively arranged in parallel on both sides of the intermediate connecting shaft;

[0011] Two mutually meshing first-stage Roots rotor components are arranged in the first-stage Roots pump body cavity, and the two first-stage Roots rotor components are respectively mounted on the intermediate connecting shaft and the first connecting shaft. When the two first-stage Roots rotor components rotate, the fluid entering from the air inlet is sent into the second-stage Roots pump body cavity through the intermediate connecting channel;

[0012] Two mutually meshing secondary Roots rotor components are arranged in the secondary Roots pump body cavity, and the two secondary Roots rotor components are respectively mounted on the intermediate connecting shaft and the second connecting shaft. When the two secondary Roots rotor components rotate, the fluid entering the intermediate connecting channel is sent into the screw pump body cavity through the connecting channel;

[0013] Two mutually meshing screw rotor components are arranged in the screw pump body cavity, and the two screw rotor components are respectively mounted on the intermediate connecting shaft and the first connecting shaft. When the two screw rotor components rotate, the fluid sent into the screw pump body cavity through the connecting channel is discharged from the exhaust port.

[0014] In the above technical solution, the intermediate coupling shaft is inserted into the first-stage Roots pump body cavity, the second-stage Roots pump body cavity and the screw pump body cavity;

[0015] One end of the second connecting shaft is inserted into the cavity of the secondary Roots pump body;

[0016] One end of the first connecting shaft is located in the cavity of the screw pump body, and the other end is located in the cavity of the first-stage Roots pump body.

[0017] In the above technical solution, a gear cavity is further provided in the pump body of the head of the first-stage Roots pump body cavity, the first-stage Roots pump body cavity is arranged between the second-stage Roots pump body cavity and the gear cavity, and the heads of the three connecting shafts are respectively inserted into the gear cavity;

[0018] A gear is installed on the head of each coupling shaft, and the gears on the heads of the first coupling shaft and the second coupling shaft are respectively meshed with the gear on the head of the intermediate coupling shaft.

[0019] In the above technical solution, the end of the intermediate connecting shaft passes through the first-stage Roots pump body cavity and the second-stage Roots pump body cavity in sequence and is inserted into the screw pump body cavity, and there is a distance between the end of the intermediate connecting shaft and the end of the screw pump body cavity;

[0020] And / or, a second clearance hole connecting the gear cavity and the secondary Roots pump cavity is provided in the pump body beside the axis of the primary Roots pump cavity, the middle part of the second connecting shaft is inserted into the second clearance hole, and the end of the second connecting shaft is arranged in the secondary Roots pump cavity and is rotatably connected to the pump body;

[0021] And / or, a first clearance hole connecting the first-stage Roots pump body cavity and the screw pump body cavity is provided in the pump body beside the axis of the second-stage Roots pump body cavity, the middle part of the first connecting shaft is inserted into the first clearance hole, and the first-stage Roots rotor component and the screw rotor component are respectively installed on the first connecting shafts on both sides of the first clearance hole.

[0022] In the above technical solution, the pump body includes a gear housing, a first bearing housing, a Roots pump body, a second bearing housing and a screw pump body which are sealed and connected in sequence.

[0023] The first-stage Roots pump body cavity and the second-stage Roots pump body cavity are arranged in the Roots pump body, and one end of the first-stage Roots pump body cavity is connected to the head of the Roots pump body, and one end of the second-stage Roots pump body cavity is connected to the end of the Roots pump body;

[0024] The first bearing housing and the second bearing housing are respectively sealed and connected to the head and the end of the Roots pump body;

[0025] The screw pump body cavity is arranged in the screw pump body, and one end of the screw pump body cavity is communicated with the head of the screw pump body cavity, and the head of the screw pump body is sealed and connected with the second bearing housing;

[0026] A gear cavity communicating with the end of the gear housing is provided in the gear housing, and the end of the gear housing is sealed and connected to the first bearing housing.

[0027] In the above technical solution, a first bearing cavity is provided in the first bearing housing, and the heads of the three connecting shafts are rotatably connected to the first bearing cavity via bearings respectively;

[0028] A second bearing cavity is provided in the second bearing housing, and the end of the second connecting shaft is rotatably connected to the second bearing cavity via a bearing;

[0029] The middle part of the intermediate connecting shaft and the middle part of the first connecting shaft are rotatably connected to the second bearing cavity via bearings respectively;

[0030] And / or, the heads of the three connecting shafts pass through the corresponding bearings and are inserted into the gear cavity respectively;

[0031] A gear is installed on the head of each coupling shaft, and the gears on the heads of the first coupling shaft and the second coupling shaft are respectively meshed with the two sides of the gear on the head of the intermediate coupling shaft.

[0032] In the above technical solution, the first bearing housing and the second bearing housing are respectively provided with cooling cavities covering the first bearing cavity and the second bearing cavity, and the first bearing housing and the second bearing housing are both provided with cooling medium inlets and cooling medium outlets connected with the corresponding cooling cavities.

[0033] In the above technical solution, a driving device is installed at the head of the pump body, and the driving device is configured to drive one of the gears or one of the connecting shafts to rotate.

[0034] In the above technical solution, the screw rotor component is installed on the outer surface corresponding to the connecting shaft, and there is a micro gap between the end of the screw rotor component and the end of the screw pump body cavity;

[0035] And / or, the first-stage Roots rotor component and the second-stage Roots rotor component are an integral structure with the corresponding connecting shaft.

[0036] In the above technical solution, a notch communicating with the connecting channel is further provided on the outer wall of the pump body, and a sealing component for sealing the notch is installed on the pump body;

[0037] And / or, a fluid processing component may be detachably installed in the connecting channel at the notch.

[0038] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0039] 1. The Roots pump and the screw pump in the utility model can be driven simultaneously by the same driving device. Compared with the previous structure in which the two motors are arranged up and down and are separated, the cost is lower, the space occupied is smaller, and the transportation cost can also be reduced;

[0040] 2. The utility model adopts three connecting shafts to connect the two-stage Roots pump rotor and the screw pump rotor, so that when assembling the mixing pump, the difficulty is lower, the assembly is more convenient, and the assembly and debugging are convenient, ensuring the qualified rate and quality of the pump body assembly;

[0041] 3. In the utility model, the first-stage Roots pump body cavity and the second-stage Roots pump body cavity are respectively arranged on both sides of the Roots pump body, which makes processing more convenient, while ensuring the accuracy during assembly, improving the assembly quality, ensuring the vacuum effect, and can effectively reduce the subsequent maintenance rate and extend the service life;

[0042] 4. The utility model adopts a two-stage Roots pump and a screw pump, the Roots pump constitutes a booster pump, and the screw pump constitutes a vacuum pump, which can effectively improve the vacuuming effect;

[0043] 5. The utility model adopts a two-stage Roots pump in front of the screw pump, so that each stage of the Roots pump will generate compression, and the heat will not be too concentrated at the exhaust port of the screw pump, which can prevent the exhaust port temperature from being too high and causing the hydrocarbon mixture to coke and block, thereby ensuring the smoothness of vacuuming, preventing the screw pump from being damaged, reducing the maintenance rate, and extending the service life;

[0044] 6. In the utility model, air is firstly pumped through a two-stage Roots pump, which can effectively prevent dust and the like from entering the screw pump, prevent the occurrence of powder jamming and clogging, reduce the maintenance rate, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the structure of the first embodiment of the present utility model;

[0046] Figure 2 yes Figure 1 A top view of

[0047] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0048] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure of FF;

[0049] Figure 5 It is a partial enlarged view of the connecting channel in the first embodiment of the utility model;

[0050] Figure 6 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle BB;

[0051] Figure 7 yes Figure 1 Schematic diagram of the cross-sectional structure of the CC;

[0052] Figure 8 yes Figure 1 Schematic diagram of the cross-sectional structure of DD;

[0053] Fig. 9 yes Figure 1 Schematic diagram of the cross-sectional structure of EE;

[0054] Fig.10 It is a partial cross-sectional structural schematic diagram of the connection between the screw rotor component and the intermediate connecting shaft in the first embodiment of the utility model.

[0055] Among them: 1. Pump body; 2. First-stage Roots pump body cavity; 3. Second-stage Roots pump body cavity; 4. Screw pump body cavity; 5. Air inlet; 6. Exhaust port; 7. Intermediate connecting channel; 8. Connecting channel; 9. Intermediate connecting shaft; 10. First connecting shaft; 11. Second connecting shaft; 12. First-stage Roots rotor component; 13. Second-stage Roots rotor component; 14. Screw rotor component; 15. Step hole; 16. Spline; 17. Step stopper; 18. Bolt; 19. Sealing end cover; 20. Gear cavity; 21. Gear; 22. Second clearance hole; 23. First clearance hole; 24. Gear housing; 25. First bearing housing; 26. Roots pump body; 27. Second bearing housing; 28. Screw pump body; 29. ​​First bearing cavity; 30. Bearing; 31. Second bearing cavity; 32. Step through hole; 33. Step cover plate; 34. Driving device; 35. Sealing component; 36. Roots connecting channel; 37. Screw connecting channel; 38. Frame; 39. Sealing cover; 40. Connecting cavity; 41. Through groove. DETAILED DESCRIPTION

[0056] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0057] Example 1: See Figures 1 to 10 As shown, a three-axis mixing pump comprises a pump body 1 and a connecting shaft rotatably mounted in the pump body;

[0058] The pump body 1 is provided with a first-stage Roots pump body cavity 2, a second-stage Roots pump body cavity 3 and a screw pump body cavity 4 which are independent of each other in sequence along the axial direction of the connecting shaft;

[0059] The pump body 1 is provided with an air inlet 5, an air outlet 6, an intermediate connecting channel 7 and a connecting channel 8. The air inlet 5 connects the first-stage Roots pump body cavity 2 with the outside atmosphere, the air outlet 6 connects the screw pump body cavity 4 with the outside atmosphere, the intermediate connecting channel 7 connects the first-stage Roots pump body cavity 2 with the second-stage Roots pump body cavity 3, and the connecting channel 8 connects the second-stage Roots pump body cavity 3 with the screw pump body cavity 4;

[0060] The connecting shaft comprises a middle connecting shaft 9, and a first connecting shaft 10 and a second connecting shaft 11 which are respectively arranged in parallel on both sides of the middle connecting shaft 9.

[0061] Among them, taking the direction shown in the figure as an example, the first-stage Roots pump body cavity 2, the second-stage Roots pump body cavity 3 and the screw pump body cavity 4 are arranged from front to back (the head is the front end and the tail is the rear end), and the three connecting shafts are arranged on the same horizontal plane. Taking the front end perspective as an example, the first connecting shaft 10 is arranged on the right side of the middle connecting shaft 9, and the second connecting shaft 11 is arranged on the left side of the middle connecting shaft 9. The middle connecting channel is arranged on the opposite side of the air inlet, and the connecting channel is arranged on the opposite side of the middle connecting channel. In this embodiment, the bottom of the pump body is placed on the ground, or the bottom of the pump body is used as a mounting and fixing part, then the air inlet is arranged at the top of the pump body, the middle connecting channel is arranged at the bottom of the pump body, the connecting channel is arranged at the top of the pump body, the connecting channel is arranged at the rear end of the air inlet, and the exhaust port is arranged on the rear end surface of the pump body.

[0062] See also Figure 3 , 4 As shown in 7 to 9, two mutually meshing first-stage Roots rotor components 12 are provided in the first-stage Roots pump body cavity 2, and the two first-stage Roots rotor components 12 are respectively mounted on the intermediate connecting shaft 9 and the first connecting shaft 10. When the two first-stage Roots rotor components 12 rotate, the fluid entering from the air inlet 5 is sent into the second-stage Roots pump body cavity 3 through the intermediate connecting channel 7;

[0063] The two-stage Roots pump body cavity 3 is provided with two mutually meshing two-stage Roots rotor components 13, and the two two-stage Roots rotor components 13 are respectively mounted on the intermediate connecting shaft 10 and the second connecting shaft 11. When the two two-stage Roots rotor components 13 rotate, the fluid entering the intermediate connecting channel 7 is sent into the screw pump body cavity 4 through the connecting channel 8;

[0064] Two mutually meshing screw rotor components 14 are provided in the screw pump body cavity 4. The two screw rotor components 14 are respectively installed on the intermediate connecting shaft 9 and the first connecting shaft 10. When the two screw rotor components 14 rotate, the fluid sent into the screw pump body cavity 4 by the connecting channel 8 is discharged from the exhaust port 6.

[0065] In this embodiment, the primary Roots pump body cavity and the secondary Roots pump body cavity are quasi-"∞"-shaped cavities (transversely arranged 8-shaped structures), which are composed of two cylindrical cavities whose inner ends are interconnected, and the two connecting shafts inserted in the corresponding Roots pump body cavities are respectively coaxially arranged with the two cylindrical cavities, and the primary and secondary Roots rotor components are also quasi-"∞"-shaped structures (transversely arranged 8-shaped structures), and their opposite end outer surfaces are fitted with the inner wall of the corresponding Roots pump body cavity, or there is a micro gap between their opposite end outer surfaces and the inner wall of the corresponding Roots pump body cavity (preferably there is a micro gap to ensure that the corresponding Roots rotor component will not contact and scratch the corresponding Roots pump body cavity inner wall when rotating). The first coupling and the second coupling have the same rotation direction, but are opposite to the rotation direction of the middle coupling. Taking the front-end perspective as an example, the middle coupling rotates clockwise, and the first coupling and the second coupling rotate counterclockwise (if the middle coupling rotates counterclockwise, the first coupling and the second coupling rotate clockwise). The first-stage Roots pump body cavity above the two mutually meshing first-stage Roots rotor components is an independent space, and the first-stage Roots pump body cavity below the two first-stage Roots rotor components is another independent space; the second-stage Roots pump body cavity above the two mutually meshing second-stage Roots rotor components is an independent space, and the second-stage Roots pump body cavity below the two second-stage Roots rotor components is another independent space. In this way, when the two primary Roots rotor components rotate, the gas entering from the air inlet is pressed into the space below the two primary Roots rotor components, and then sent into the secondary Roots pump body cavity through the middle connecting channel, which is in the secondary Roots pump body cavity below the two secondary Roots rotor components. Then, when the two secondary Roots rotor components rotate, the gas below them is sent into the secondary Roots pump body cavity above the two secondary Roots rotor components, and then sent to the front end of the screw pump body cavity through the connecting channel, wherein, there is a micro gap between the outer surfaces of the two screw rotor components and the inner surfaces of the screw pump body cavities on the corresponding sides, and the outer surfaces of the screw rotor components have spiral grooves (spiral exhaust grooves), the groove width of the spiral grooves gradually decreases from front to back, and the screw rotor components beside the spiral grooves will mesh with the spiral grooves of the adjacent screw rotor components (and there is a gap between the two and they will not contact each other), so that the fluid sent into the screw pump body cavity through the connecting channel is discharged backwards through the gap of the spiral groove and sent out through the exhaust port, thereby realizing the vacuum pumping action.

[0066] The two screw rotor components 14 are respectively mounted on the outer surfaces of the ends of the intermediate connecting shaft 9 and the first connecting shaft 10, and there is a micro gap between the ends of the screw rotor components 14 and the ends of the screw pump body cavity 4;

[0067] In this embodiment, the middle part of the screw rotor component 14 has a coaxially arranged stepped hole 15, and the stepped hole 15 includes a front hole and a rear hole. The diameter of the front hole is smaller than the diameter of the rear hole, and the diameter of the front hole matches the outer diameter of the connecting shaft. The rear ends of the first connecting shaft and the intermediate connecting shaft have a screw hole, and the outer surface of the connecting shaft in the screw pump body cavity 4 has a keyway, and the front hole is also provided with a keyway. The connecting shaft and the screw rotor component 14 are connected by a spline 16, and the inner end of the spline 16 is stuck in the keyway of the connecting shaft, and the outer end of the spline is stuck in the keyway of the front hole, thereby realizing circumferential limitation between the screw rotor component and the connecting shaft to prevent the two from rotating relative to each other. A step stopper 17 is installed in the rear hole, the front side of the middle part of the step stopper 17 is against the front end face of the rear hole, and the front end of the step stopper is against the rear side of the coupling shaft, and then the bolt 18 passes through the step stopper 17 and the screw hole at the rear end of the coupling shaft to connect, thereby axially fixing the screw rotor component and the coupling shaft to prevent the two from axially moving away from each other. Furthermore, a sealing end cover 19 is installed at the rear end of the screw rotor component, and the sealing end cover 19 seals the rear end of the rear hole, which can prevent gas from entering the rear hole and ensure the vacuum effect. In this way, the rear ends of the intermediate coupling and the first coupling will not contact and connect with the rear end surface of the screw pump body cavity, and there is an axial spacing between the two, that is, the first coupling, the intermediate coupling and the screw rotor component are cantilever screw structures, and the front end of the screw rotor component is rotatably supported through the connection between the coupling and the pump body, and the rear end is not restricted. This structure is convenient for debugging during the assembly process and adjusting the spacing between the two screw rotor components to ensure the meshing between the two. The two screw rotor components will not contact, but there is only a slight gap between them, and they will not rub against each other, thereby ensuring the quality of vacuum extraction.

[0068] See also Figure 3 , 4 As shown in , 7 and 8, the intermediate connecting shaft 9 is inserted into the first-stage Roots pump body cavity 2, the second-stage Roots pump body cavity 3 and the screw pump body cavity 4;

[0069] One end of the second connecting shaft 11 is inserted into the second-stage Roots pump body cavity 3;

[0070] One end of the first connecting shaft 10 is located in the screw pump body cavity 4 , and the other end is located in the first-stage Roots pump body cavity 2 .

[0071] The two first-stage Roots rotor components 12 in the first-stage Roots pump body cavity 2 are respectively integrated with the intermediate connecting shaft 9 and the first connecting shaft 10, and the two second-stage Roots rotor components 13 in the second-stage Roots pump body cavity 3 are respectively integrated with the intermediate connecting shaft 9 and the second connecting shaft 11.

[0072] In this way, only the middle connecting shaft will be in the three pump body cavities, and the first connecting shaft will only be in the first-stage Roots pump body cavity and the screw pump body cavity, and the second connecting shaft will only be in the second-stage Roots pump body cavity. In this way, when assembling, the setting of the three connecting shafts is convenient for adjusting the micro-gap between the corresponding rotor parts and the rotor parts when adjusting the corresponding rotor parts, and the micro-gap between the rotor parts and the inner wall of the corresponding pump body cavity, which is convenient for assembly and adjustment. After the micro-gap is adjusted and assembled, it can effectively extend the service life and reduce the maintenance rate when in use. At the same time, only the first-stage Roots rotor parts and the first-stage and second-stage Roots rotor parts need to be processed in one piece on the middle connecting shaft, and only the first-stage Roots rotor parts need to be processed in one piece on the first connecting shaft, and only the second-stage Roots rotor parts need to be processed in one piece on the second connecting shaft, which can reduce the processing difficulty and processing cost, and is also convenient for debugging and adjustment during assembly.

[0073] See also Figure 3 , 4 As shown in 6, a gear cavity 20 is further provided in the pump body 1 at the head of the first-stage Roots pump body cavity 2, the first-stage Roots pump body cavity 2 is arranged between the second-stage Roots pump body cavity 3 and the gear cavity 20, and the heads of the three connecting shafts are respectively inserted into the gear cavity 20;

[0074] A gear 21 is installed at the head of each of the connecting shafts, and the gears 21 at the heads of the first connecting shaft 10 and the second connecting shaft 11 are respectively meshed with the two sides of the gear 21 at the head of the intermediate connecting shaft 9. In this way, when one of the connecting shafts is driven to rotate, the three connecting shafts will rotate at the same time, and the first connecting shaft and the second connecting shaft will rotate in the same direction, and the intermediate connecting shaft will rotate in the opposite direction to the first connecting shaft and the second connecting shaft.

[0075] See also Figure 3 , 4 As shown in Figures 7 and 8, the end of the intermediate connecting shaft 9 passes through the first-stage Roots pump body cavity 2 and the second-stage Roots pump body cavity 3 in sequence and is inserted into the screw pump body cavity 4, and there is a distance between the end of the intermediate connecting shaft 9 and the end of the screw pump body cavity 4.

[0076] A second clearance hole 22 connecting the gear cavity 20 and the secondary Roots pump body cavity 3 is provided in the pump body 1 beside the axis of the first-stage Roots pump body cavity 2, the middle part of the second connecting shaft 11 is inserted in the second clearance hole 22, and the end of the second connecting shaft 11 is arranged in the second-stage Roots pump body cavity 3 and is rotatably connected to the pump body 1.

[0077] In this way, the second relief hole and the first-stage Roots pump body cavity are independent of each other and do not affect each other. In this way, when assembling, there will be no collision problem when the first-stage Roots rotor components and the second-stage Roots rotor components are assembled separately, and it is also convenient for assembly and debugging.

[0078] See also Figure 3 , 4 As shown in Figures 7 and 8, a first clearance hole 23 connecting the first Roots pump body cavity 2 and the screw pump body cavity 4 is provided in the pump body 1 beside the axis of the second Roots pump body cavity 3, the middle part of the first connecting shaft 10 is inserted in the first clearance hole 23, and the first Roots rotor component 12 and the screw rotor component 14 are respectively installed on the first connecting shaft 10 on both sides of the first clearance hole 23. In this way, the second Roots pump body cavity and the first clearance hole are also independent of each other and do not interfere with each other, which is convenient for assembly and debugging.

[0079] See also Figure 3 , 4 6 to 9, the pump body 1 includes a gear housing 24, a first bearing housing 25, a Roots pump body 26, a second bearing housing 27 and a screw pump body 28 which are sealed and connected in sequence.

[0080] The first-stage Roots pump body cavity 2 and the second-stage Roots pump body cavity 3 are arranged in the Roots pump body 26, and one end of the first-stage Roots pump body cavity 2 is connected to the head of the Roots pump body 26, and one end of the second-stage Roots pump body cavity 3 is connected to the end of the Roots pump body 26;

[0081] The first bearing housing 25 and the second bearing housing 27 are respectively sealed and connected to the head and the end of the Roots pump body 26;

[0082] The screw pump body cavity 4 is disposed in the screw pump body 28, and one end of the screw pump body cavity 4 is connected to the head of the screw pump body cavity 4, and the head of the screw pump body 26 is sealed and connected to the second bearing housing 27;

[0083] The gear housing 24 has a gear cavity 20 in communication with a distal end of the gear housing 24 . The distal end of the gear housing 24 is sealed and connected to the first bearing housing 25 .

[0084] A first bearing cavity 29 is provided in the first bearing housing 25, and the heads of the three connecting shafts are rotatably connected to the first bearing cavity 29 via bearings 30 respectively;

[0085] A second bearing cavity 31 is provided in the second bearing housing 27, and the end of the second connecting shaft 11 is rotatably connected to the second bearing cavity 31 via a bearing 30;

[0086] The middle part of the intermediate connecting shaft 9 and the middle part of the first connecting shaft 10 are rotatably connected to the second bearing cavity 31 via bearings 30 respectively;

[0087] The heads of the three connecting shafts pass through the corresponding bearings 30 and are inserted into the gear cavity 20 .

[0088] A gear 21 is installed at the head of each of the connecting shafts, and the gears at the heads of the first connecting shaft 10 and the second connecting shaft 11 are respectively meshed with the two sides of the gear 21 at the head of the intermediate connecting shaft 9 .

[0089] In this embodiment, there is a certain misalignment relationship between the primary Roots pump body cavity and the secondary Roots pump body cavity. The primary Roots pump body cavity is arranged at the front end of the secondary Roots pump body cavity and is arranged close to the right side of the Roots pump body, while the secondary Roots pump body cavity is arranged close to the left side of the Roots pump body, and the two are misaligned by a certain position. At the same time, in order to facilitate the assembly of the intermediate connecting shaft and the Roots pump body, the Roots pump body 26 between the primary Roots pump body cavity 2 and the secondary Roots pump body cavity 3 is provided with a stepped through hole 32 that connects the two, and the stepped through hole and the intermediate connecting shaft are arranged coaxially, and the size of the stepped through hole is slightly larger than the outer dimensions of the primary Roots rotor component and the second Roots rotor component, so that when the intermediate connecting shaft needs to be inserted into the Roots pump body, the primary Roots rotor component or the secondary Roots rotor component can be inserted into the corresponding Roots pump body cavity through the stepped through hole. In order to block the gap between the first-stage Roots pump body cavity, the second-stage Roots pump body cavity and the stepped through hole, so as to ensure that the two stages are vacuumed in sequence, a stepped cover plate 33 with a hole in the middle will be installed on the stepped through hole, and the stepped cover plate will block the gap between the stepped hole and the middle connecting shaft. Preferably, since the intermediate connecting shaft has a first-stage Roots rotor component and a second-stage Roots rotor component of an integral structure, there is a distance between the first-stage Roots rotor component and the second-stage Roots rotor component, and the stepped cover plate adopts a two-half structure, namely a first cover plate and a second cover plate, and grooves matching the connecting rod are provided at the opposite ends of the first cover plate and the second cover plate, and the two grooves constitute a hole position matching the intermediate connecting shaft. In this way, during assembly, taking the front end of the stepped cover plate being in the cavity of the second Roots pump body as an example, the first cover plate and the second cover plate are firstly relatively inserted into the outside of the intermediate connecting shaft between the first-stage Roots rotor component and the second-stage Roots rotor component, and then the intermediate connecting shaft and the first-stage Roots rotor component are inserted into the cavity of the first-stage Roots pump body through the stepped through hole, and then the cover plate and the Roots pump body are locked, and the assembly of the intermediate connecting shaft and the Roots pump body is completed. Among them, preferably, in order to prevent the cover plate from rotating with the intermediate connecting shaft and causing relative friction with the Roots pump body, the stepped through hole and the outer shape of the cover plate can be set to a non-circular structure. After installation, the cover plate is prevented from rotating with the intermediate connecting shaft and also plays a role in alignment during the assembly process.

[0090] The front end of the middle connecting channel is communicated with the bottom of the first-stage Roots pump body cavity, and the rear end of the middle connecting channel is communicated with the bottom of the second-stage Roots pump body cavity.

[0091] In this embodiment, the primary Roots pump body cavity and the secondary Roots pump body cavity are directly arranged on the same Roots pump body, so that when the Roots pump body is processed, the same reference can be used for processing positioning, which can improve the processing accuracy of the Roots pump body, thereby ensuring the vacuum effect after subsequent assembly. If the Roots pump body adopts a segmented structure, that is, the primary Roots pump body cavity and the secondary Roots pump body cavity are respectively processed and then assembled, the processing reference is different, which will lead to deviations in processing accuracy and error, thereby causing a certain deviation in the assembly difficulty and accuracy of the Roots pump (the Roots pump formed after the Roots rotor component is installed in the corresponding Roots pump body cavity), increasing the subsequent assembly difficulty and affecting the subsequent service life. Therefore, in this embodiment, the primary Roots pump body cavity and the secondary Roots pump body cavity are arranged on the same Roots pump body, which can effectively ensure the processing accuracy of the primary Roots pump body cavity and the primary and secondary Roots pump body cavity, reduce the processing difficulty, and also reduce the subsequent assembly and debugging difficulty, effectively ensure the vacuum effect during use, extend the service life, and reduce the maintenance rate.

[0092] At the same time, in this embodiment, a first bearing housing and a second bearing housing are respectively arranged at both ends of the Roots pump body, and a corresponding bearing cavity is arranged in the corresponding bearing housing, and the first bearing cavity is arranged on the front end face (head) of the first bearing housing, and it is arranged away from the Roots pump body. Among them, there are three first bearing cavities, and the front end (head) of each coupling shaft is rotatably connected to a first bearing cavity through a bearing, wherein the first bearing housing has a hole position on it to connect the first bearing housing with the rear end face of the first bearing housing, so that it is convenient for the coupling shaft to be inserted into the Roots pump body. There are also three second bearing cavities, and the second bearing cavity is arranged on the rear end face (end) of the second bearing housing, and the second bearing cavity is arranged away from the Roots pump body, and the rear end (end) of each coupling shaft or the corresponding middle part is rotatably connected to a second bearing cavity through a bearing. Among them, the second bearing housing has a hole position on it to connect the front end face of the second bearing housing with the second bearing cavity, so that it is convenient for the corresponding coupling shaft to pass through the second bearing housing and be inserted into the second bearing cavity to connect with the bearing.

[0093] Among them, when assembling the mixing pump, first insert the three connecting shafts into the Roots pump body. At this time, the first-stage Roots rotor component and the second-stage Roots rotor component will also be installed in the corresponding Roots pump body cavity. At this time, the gaps between the corresponding Roots rotor components and the gaps between the Roots rotor components and the Roots pump body cavity have not been adjusted. Then install the first bearing housing and the second bearing housing at both ends of the Roots pump body respectively, seal the first Roots pump body cavity and the second Roots pump body cavity, and then install bearings at both ends of the connecting shaft respectively (the bearings are installed and limited through the bearing seat, and the adjustment is carried out). The bearing seat clamps the outer steel ring of the bearing) so that the bearings at both ends are respectively installed in the first bearing cavity and the second bearing cavity. In this process, by adjusting the gap between the bearing and the first bearing cavity and the connecting shaft, adjusting the gap between the bearing and the second bearing cavity and the connecting shaft, the position of the corresponding connecting shaft is adjusted to adjust the gap between the two first-stage Roots rotor components, the first-stage Roots rotor components and the first Roots pump body cavity, and adjusting the gap between the two second-stage Roots rotor components, the second-stage Roots rotor components and the second Roots pump body cavity, so as to achieve the installation and adjustment of the Roots rotor components. After the installation is completed, the two screw rotor components are respectively installed on the corresponding two connecting shafts. After the screw rotor components are installed, the screw pump body is installed. The screw pump body cavity will be connected to the front end of the screw pump body, and the front end of the screw pump body and the second bearing housing are directly sealed and connected. At this time, the screw rotor component will be installed in the screw pump body cavity. Then install the gear to the head of the connecting shaft, and then install the gear housing to the front end of the first gear housing so that the gear is in the gear cavity, and the installation can be completed.

[0094] At the same time, the stepped limiter will limit the freedom of the screw rotor component to move backward, and the front end of the screw rotor component will abut against the bearing in the second bearing cavity, thereby limiting the freedom of the screw rotor component to move forward, thereby achieving axial limitation of the screw rotor component.

[0095] See also Figure 3 , 4As shown, a driving device 34 is installed at the head of the pump body 1, and the driving device 34 is configured to drive one of the gears 21 or one of the connecting shafts to rotate. In the utility model, the driving device adopts a motor, or the driving device adopts a combination of a motor and a reducer. In this embodiment, the driving device includes a motor, which is installed at the head of the gear housing, that is, the motor is installed on the front end surface of the gear housing, and the output shaft of the motor passes through the gear housing and is inserted into the gear cavity, wherein the output shaft of the motor will be connected to a gear, or used to be connected to the front end of a connecting shaft, so that when the motor is working, it can drive one of the connecting shafts to rotate, and when this connecting shaft rotates, it will drive the other two connecting shafts to rotate through the gear, thereby realizing the synchronous rotation of the primary and secondary Roots rotor components and the screw rotor components, thereby realizing the three-stage vacuum pumping action (the primary Roots rotor component performs the primary vacuum pumping action in the primary Roots pump body cavity, the secondary Roots rotor component performs the secondary vacuum pumping action in the secondary Roots pump body cavity, and the screw rotor component performs the three-stage vacuum pumping action in the screw pump body cavity).

[0096] Among them, the Roots pump adopts a two-stage Roots pump (a first-stage Roots pump body cavity, a first-stage Roots rotor component and a second-stage Roots pump body cavity, a second-stage Roots rotor component, that is, a two-stage Roots pump structure), which can achieve two-stage compression in a limited space (also plays a role in boosting), improve vacuum degree and vacuum efficiency, reduce space occupation, reduce energy consumption, and save costs. At the same time, the heat generated by the first-stage Roots rotor component in the process of vacuuming and compressing the gas can be dissipated in advance, which can effectively prevent the temperature of the rear end screw rotor component from being high, and can effectively prevent the high temperature from damaging the screw rotor component. In addition, the temperature of the screw rotor component is lower, and it is not easy to cause the coking phenomenon of hydrocarbon mixture (high temperature is prone to the coking of hydrocarbon mixture and clogging), and prevent the problem of clogging at the screw rotor component affecting the vacuuming, ensure the stability of vacuuming, reduce the temperature of the exhaust port, reduce the maintenance rate, and extend the service life. When a two-stage Roots vacuum pump is used to process the process medium, since the performance of the secondary Roots pump body cavity and the secondary Roots rotor component can form a different compression ratio from the primary Roots pump body cavity and the primary Roots rotor component, after calculating and designing a range of compression ratio values, the temperature of the process medium discharged from the primary Roots pump body cavity can reach a higher and more stable temperature when entering the secondary Roots pump body cavity, and the process medium is further compressed in the secondary Roots pump body cavity, which is convenient for subsequent screw pump rotor components to be sucked, and the vacuum degree is further improved. Since the intermediate connecting channel in this embodiment is at the bottom of the pump body, it is convenient for heat dissipation.

[0097] Among them, in the utility model, the dry screw pump composed of two screw rotor parts and the screw pump body cavity is a non-wet structure, that is, no lubricant needs to be added inside. In this way, it is suitable for working in a high-dust environment and reduces the occurrence of blockage. In order to reduce the occurrence of blockage, a two-stage Roots pump structure is adopted, that is, the Roots pump is used for two-stage compression and pressurization. In this way, when the gas with dust enters the first level between the adjacent screw rotor parts of the screw pump body cavity, due to the absence of lubricant, it is not easy for dust to stick to the lubricant and cause blockage. In addition, the air flow pressure entering the screw pump body cavity is high, and the dust is discharged quickly. Even if blockage occurs, it can extend the normal use time and reduce the frequency of cleaning and maintenance.

[0098] Among them, the first bearing housing 25 and the second bearing housing 27 are respectively provided with cooling cavities (not shown in the cooling cavity figure) covering the first bearing cavity 29 and the second bearing cavity 31, and the first bearing housing and the second bearing housing are both provided with cooling medium inlets and cooling medium outlets connected with the corresponding cooling cavities.

[0099] In the present embodiment, since the corresponding Roots rotor components and the Roots pump cavity will not contact each other, and the screw rotor components and the screw pump cavity will not contact each other, the coupling shaft will only contact the pump body through the bearing. In this way, during the rotation of the coupling shaft, the bearing will generate high temperature. Due to the high temperature of the bearing, the pump body and the coupling shaft will be slightly deformed at the contact or connection with the bearing. The mixing pump is a high-precision device. If the coupling shaft at the bearing is slightly deformed, the corresponding first-stage Roots rotor components, second-stage Roots rotor components, and screw rotor components may rub against each other, or rub against the inner wall of the corresponding Roots pump body cavity and the screw pump body cavity, which will not only affect the vacuum pumping effect, but also cause abnormal noise, wear and other problems, the maintenance rate will be high, and the service life will be shortened. Therefore, through the setting of the cooling cavity, the cooling cavity will be covered on the outside of the corresponding bearing cavity. The cooling medium is introduced into the cooling cavity from the cooling medium inlet and discharged from the cooling medium outlet, thereby realizing the circulation of the cooling medium in the cooling cavity, which is used to cool the bearing cavity and the bearing, thereby preventing the above-mentioned problems, ensuring the stability of the use of the coupling, ensuring the accuracy of assembly, and ensuring the stability of use and service life.

[0100] For further information, see Figure 4 , 5 As shown in FIG. 8 , a notch communicating with the connecting channel 8 is further provided on the outer wall of the pump body 1 , and a sealing component 35 for sealing the notch is installed on the pump body 1 .

[0101] In this embodiment, the notch is arranged at the top of the pump body, and the sealing component is used to seal the top of the notch, so that the connecting channel can only connect the secondary Roots pump body cavity and the screw pump body cavity.

[0102] Preferably, in the present embodiment, the connecting channel comprises a Roots connecting channel 36 and a screw connecting channel 37, the bottom of the Roots connecting channel 36 is connected to the top of the secondary Roots pump body cavity 3, the top of the Roots connecting channel 36 is connected to the top of the Roots pump body 26, and is arranged close to the screw pump body, that is, the top of the Roots connecting channel 36 is arranged close to the rear end of the Roots pump body; the bottom of the screw connecting channel 37 is connected to the screw pump body cavity 4, and the top of the screw connecting channel 37 is connected to the top of the second bearing housing 27, so that the Roots connecting channel 36 and the top of the screw connecting channel 37 constitute the notch.

[0103] Among them, the sealing component 35 includes a frame 38 and a sealing cover 39. The frame 38 is a hollow structure with an opening at the top. A connecting cavity 40 is provided on the top of the frame 38. Two through grooves 41 are provided on the bottom surface of the frame 38 to communicate with the connecting cavity 40. The two through grooves are respectively arranged opposite to the top of the Roots connecting channel and the top of the screw connecting channel. The two ends of the frame are respectively installed on the top of the Roots pump body and the second bearing housing, so that the two through grooves are respectively against the top of the Roots connecting channel and the screw connecting channel, so that the gas sent out of the Roots connecting channel will enter the connecting cavity through the corresponding through grooves, and the sealing cover will seal the top of the connecting cavity. In this way, the gas sent out of the secondary Roots pump body cavity enters the connecting cavity through the Roots connecting channel and the corresponding through groove, and then enters the screw connecting channel from another through groove through the connecting cavity, thereby entering the screw pump body cavity. In this way, the Roots connecting channel, the screw connecting channel and the connecting cavity constitute a complete connecting channel. In this way, the operator can directly open the sealing cover and frame to expose the Roots connection channel and the screw connection channel. The operator can observe the internal situation through the corresponding Roots connection channel and the screw connection channel, and can perform a simple inspection without disassembling the pump body, and then carry out targeted disassembly and maintenance. There is no need to disassemble the pump body for inspection, which improves the convenience of subsequent inspection. In addition, when assembling and debugging the mixing pump, the internal situation can also be observed through the Roots connection channel and the screw connection channel, and the caliper can be inserted into the interior to check the assembly clearance, which is convenient for debugging.

[0104] Furthermore, a filter screen can be arranged in the through groove to filter dust and other debris in the Roots connecting channel and the screw connecting channel. At the same time, during the assembly process, it can also prevent debris from entering the corresponding secondary Roots pump body cavity or the screw pump body cavity through the through groove.

[0105] Furthermore, a fluid treatment component (not shown in the figure of the fluid treatment component) can be detachably installed in the connecting channel at the notch. The fluid treatment component can be directly placed in the connecting cavity to treat the fluid flowing through the connecting channel. The fluid treatment component can be a filter, an alkali bag, a cooler or a heater. The filter can be used to filter dust and other debris flowing through the connecting channel. The alkali bag is used to adsorb water vapor to prevent the mixing of dust and water vapor from blocking adjacent screw rotor components or the screw pump body cavity. If the temperature of the secondary Roots pump body cavity sent into the screw pump body cavity is too high, a cooler can be set to cool the gas to prevent the coking of hydrocarbon mixtures. If the temperature of the secondary Roots pump body cavity sent into the screw pump body cavity is too low, the temperature of the gas entering the screw pump body cavity is too low, and the problem of condensed water is prone to occur, so that dust and condensed water mix and block the screw pump body cavity. A heater can be added to heat the gas to prevent the occurrence of condensation. Of course, there are other situations, and you can choose according to different construction environments. This is scalable and has a wider range of applications. It can effectively ensure the vacuum effect of the mixing pump, extend its service life, and reduce the maintenance rate.

[0106] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0107] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

Claims

1. A three-axis mixing pump, characterized in that: It includes a pump body and a connecting shaft rotatably installed in the pump body; The pump body is provided with a first-stage Roots pump body cavity, a second-stage Roots pump body cavity and a screw pump body cavity which are independent of each other in sequence along the axial direction of the connecting shaft; The pump body is provided with an air inlet, an air outlet, an intermediate connecting channel and a connecting channel, the air inlet connects the first-stage Roots pump body cavity with the outside atmosphere, the air outlet connects the screw pump body cavity with the outside atmosphere, the intermediate connecting channel connects the first-stage Roots pump body cavity with the second-stage Roots pump body cavity, and the connecting channel connects the second-stage Roots pump body cavity with the screw pump body cavity; The connecting shaft comprises an intermediate connecting shaft, and a first connecting shaft and a second connecting shaft which are respectively arranged in parallel on both sides of the intermediate connecting shaft; Two mutually meshing first-stage Roots rotor components are arranged in the first-stage Roots pump body cavity, and the two first-stage Roots rotor components are respectively mounted on the intermediate connecting shaft and the first connecting shaft. When the two first-stage Roots rotor components rotate, the fluid entering from the air inlet is sent into the second-stage Roots pump body cavity through the intermediate connecting channel; Two mutually meshing secondary Roots rotor components are arranged in the secondary Roots pump body cavity, and the two secondary Roots rotor components are respectively mounted on the intermediate connecting shaft and the second connecting shaft. When the two secondary Roots rotor components rotate, the fluid entering the intermediate connecting channel is sent into the screw pump body cavity through the connecting channel; Two mutually meshing screw rotor components are arranged in the screw pump body cavity, and the two screw rotor components are respectively mounted on the intermediate connecting shaft and the first connecting shaft. When the two screw rotor components rotate, the fluid sent into the screw pump body cavity through the connecting channel is discharged from the exhaust port.

2. The three-axis mixing pump according to claim 1, characterized in that: The intermediate coupling shaft is inserted into the first-stage Roots pump body cavity, the second-stage Roots pump body cavity and the screw pump body cavity; One end of the second connecting shaft is inserted into the cavity of the secondary Roots pump body; One end of the first connecting shaft is located in the cavity of the screw pump body, and the other end is located in the cavity of the first-stage Roots pump body.

3. The three-axis mixing pump according to claim 1, characterized in that: The pump body of the first-stage Roots pump body cavity head is also provided with a gear cavity, the first-stage Roots pump body cavity is arranged between the second-stage Roots pump body cavity and the gear cavity, and the heads of the three connecting shafts are respectively inserted into the gear cavity; A gear is installed on the head of each coupling shaft, and the gears on the heads of the first coupling shaft and the second coupling shaft are respectively meshed with the gear on the head of the intermediate coupling shaft.

4. The three-axis mixing pump according to claim 3, characterized in that: The end of the intermediate connecting shaft passes through the first-stage Roots pump body cavity and the second-stage Roots pump body cavity in sequence and is inserted into the screw pump body cavity, and there is a distance between the end of the intermediate connecting shaft and the end of the screw pump body cavity; And / or, a second clearance hole connecting the gear cavity and the secondary Roots pump cavity is provided in the pump body beside the axis of the primary Roots pump cavity, the middle part of the second connecting shaft is inserted into the second clearance hole, and the end of the second connecting shaft is arranged in the secondary Roots pump cavity and is rotatably connected to the pump body; And / or, a first clearance hole connecting the first-stage Roots pump body cavity and the screw pump body cavity is provided in the pump body beside the axis of the second-stage Roots pump body cavity, the middle part of the first connecting shaft is inserted into the first clearance hole, and the first-stage Roots rotor component and the screw rotor component are respectively installed on the first connecting shafts on both sides of the first clearance hole.

5. The three-axis mixing pump according to claim 1, characterized in that: The pump body comprises a gear housing, a first bearing housing, a Roots pump body, a second bearing housing and a screw pump body which are sealed and connected in sequence. The first-stage Roots pump body cavity and the second-stage Roots pump body cavity are arranged in the Roots pump body, and one end of the first-stage Roots pump body cavity is connected to the head of the Roots pump body, and one end of the second-stage Roots pump body cavity is connected to the end of the Roots pump body; The first bearing housing and the second bearing housing are respectively sealed and connected to the head and the end of the Roots pump body; The screw pump body cavity is arranged in the screw pump body, and one end of the screw pump body cavity is communicated with the head of the screw pump body cavity, and the head of the screw pump body is sealed and connected with the second bearing housing; A gear cavity communicating with the end of the gear housing is provided in the gear housing, and the end of the gear housing is sealed and connected to the first bearing housing.

6. The three-axis mixing pump according to claim 5, characterized in that: A first bearing cavity is provided in the first bearing housing, and the heads of the three connecting shafts are rotatably connected to the first bearing cavity via bearings respectively; A second bearing cavity is provided in the second bearing housing, and the end of the second connecting shaft is rotatably connected to the second bearing cavity via a bearing; The middle part of the intermediate connecting shaft and the middle part of the first connecting shaft are rotatably connected to the second bearing cavity via bearings respectively; And / or, the heads of the three connecting shafts pass through the corresponding bearings and are inserted into the gear cavity; A gear is installed on the head of each coupling shaft, and the gears on the heads of the first coupling shaft and the second coupling shaft are respectively meshed with the two sides of the gear on the head of the intermediate coupling shaft.

7. The three-axis mixing pump according to claim 6, characterized in that: The first bearing housing and the second bearing housing are respectively provided with cooling cavities covering the first bearing cavity and the second bearing cavity. The first bearing housing and the second bearing housing are both provided with cooling medium inlets and cooling medium outlets communicating with the corresponding cooling cavities.

8. The three-axis mixing pump according to claim 3 or 6, characterized in that: A driving device is installed at the head of the pump body, and the driving device is configured to drive one of the gears or one of the connecting shafts to rotate.

9. The three-axis mixing pump according to claim 1, characterized in that: The screw rotor component is mounted on the outer surface of the corresponding coupling shaft, and a micro gap is formed between the end of the screw rotor component and the end of the screw pump body cavity; And / or, the first-stage Roots rotor component and the second-stage Roots rotor component are an integral structure with the corresponding connecting shaft.

10. The three-axis mixing pump according to claim 1, characterized in that: The outer wall of the pump body is also provided with a notch communicating with the connecting channel, and a sealing component for sealing the notch is installed on the pump body; And / or, a fluid processing component may be detachably installed in the connecting channel at the notch.

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