CN113606131B - Cantilever connection structure for Roots pump or screw pump - Google Patents

Cantilever connection structure for Roots pump or screw pump Download PDF

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Publication number
CN113606131B
CN113606131B CN202110968632.7A CN202110968632A CN113606131B CN 113606131 B CN113606131 B CN 113606131B CN 202110968632 A CN202110968632 A CN 202110968632A CN 113606131 B CN113606131 B CN 113606131B
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rotor
cantilever
bearing
cover plate
driving
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CN113606131A (en
Inventor
荣易
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Duitong Vacuum Technology Shanghai Co Ltd
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Duitong Vacuum Technology Shanghai Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/126—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

A cantilever connection structure for a Roots pump or a screw pump comprises an outer shell, a bearing end cover, a driving shaft rotor and a cantilever rotor, wherein the driving shaft rotor is connected with a driving positioning sleeve, and a circular boss is arranged on the driving positioning sleeve; the cantilever rotor comprises a linear rotor, a transition cylinder and a cantilever rotor positioning ring; the cantilever rotor positioning ring is fixedly connected with the driving positioning sleeve; the outer shell is sleeved outside the cantilever rotor, the bearing end cover is arranged outside the driving shaft rotor, a first step is arranged in the bearing end cover, a second step is arranged on the outer surface of the driving shaft rotor, a bearing cavity is arranged between the first step and the second step, and a bearing is arranged in the bearing cavity. The application overcomes the defects of the prior art, and the cantilever rotor positioning ring is matched with the driving positioning sleeve which is matched with the driving shaft rotor, so that the rigidity and the integral performance of the cantilever rotor can be ensured, the machining requirement is greatly reduced, and the embedded matching of an extended shaft and the rotor is not needed.

Description

Cantilever connection structure for Roots pump or screw pump
Technical Field
The application relates to the technical field of Roots pumps, in particular to a cantilever shaft or rotor connecting structure which is used for a Roots vacuum pump, a Roots blower, a screw vacuum pump and a multistage dry vacuum pump and adopts a rotor mixed cantilever structure or a cantilever structure. And more particularly to a cantilever connection structure for a roots pump or a screw pump.
Background
Most of the traditional Roots vacuum pumps, roots fans, screw vacuum pumps and other types of multistage dry vacuum pumps adopt non-cantilever structures, namely, the two ends of an impeller and a shaft in a pump cavity are respectively supported by bearings, and rotation is realized. The greatest advantage of this traditional mode is: the weight of the rotor is uniformly distributed and stressed on the bearings at the two ends, and the bearings at the two ends are fixed in the bearing cavity, so that the stability and the minimum runout of the intermediate rotor are ensured to the greatest extent. As the Roots vacuum pump, the Roots blower, the screw vacuum pump and other types of multistage dry vacuum pumps belong to positive displacement pumps, two rotors are meshed with each other while rotating, so that the two ends of adjacent rotors are ensured to be stable, the jumping of the two ends of any shaft when the rotors rotate at high speed is required to be minimized, and if the phenomenon of shaking and deflection occurs on the end face of any rotor, the meshed rotors are separated from the meshing contact surface, so that interference and collision occur.
However, this type of bearing mounting, while ensuring minimal runout at both ends of the shaft and rotor, has a significant disadvantage in that once maintenance of the rotor is required, the rotor and shaft must be removed from the pump chamber after the bearing has been removed, and each removal of the bearing must necessarily wear the bearing chamber and the bearing. With the current Roots vacuum pump, roots blower, screw vacuum pump and other types of multistage dry vacuum pumps are more and more widely used in the industrial field, and the dry vacuum pump is found to have the advantages of more energy saving and more environmental protection compared with other oil rotary vane pumps, but also has the advantages that once dust, viscosity, hydrocarbon and corrosive media are contained in pumped substances, adhesion, residue, corrosion and the like are easy to occur in a cavity rotor, so that the meshed rotor has a clamping pump fault. Many times, the rotor must be removed from the pump chamber to facilitate complete cleaning.
In particular, in the case of a screw pump, the exhaust port of the multistage dry vacuum pump is high and at atmospheric pressure, so that dust, viscosity, hydrocarbon and corrosive media are contained in the suction, and when the suction is discharged from the pump cavity after compression, the bearing measured at the exhaust port is inevitably polluted by the harmful media entrained by the gases, so that the bearing is changed and is easily damaged. This is also the main reason for the very high failure rate of the present screw vacuum pumps, multi-stage dry vacuum pumps in chemical applications (corrosive, viscous environment), and in dust-laden applications. Even if many screw vacuum pumps adopt nitrogen gas seal, mechanical seal and lip seal multiple protection, the bearing at the exhaust port side cannot be completely stopped from contacting harmful media, because the exhaust pressure is higher than the atmospheric pressure and is necessarily higher than the pressure of a cavity of the bearing, so that the bearing is necessarily contacted by the gaseous media in long-term operation.
After the cantilever rotor structure is adopted, the bearing can be arranged at the low vacuum degree side, so that the influence of dust, viscosity, hydrocarbon and corrosive medium on the bearing at the exhaust port side can be completely avoided. While the bearing on the vacuum side cannot be affected by the harmful medium at any time because the pressure in the bearing chamber is balanced and well above the intake pressure.
However, with the cantilever rotor, according to the principle of the arm of force, the bearing-free end of the shaft and the rotor lacks stability, and when rotating at high speed, huge runout easily occurs, so that adjacent rotors cannot be meshed. The cantilever rotor is relatively complex in mounting mode, firstly, the cantilever rotor is required to meet the end face clearance and the azimuth degree, the common cantilever mode is a through shaft, the impeller is sleeved on the shaft, and the azimuth degree is ensured through a key. The strength of the cantilever shaft and the length of the cantilever are critical, the cantilever is too long, the weight of the rotor is fully loaded on the shaft, the larger the torque is, and the jump cannot be guaranteed necessarily when the rotor rotates. Moreover, due to the cantilever shaft, the shaft cannot meet the rigidity with a larger diameter. This structure must be very unstable.
Disclosure of Invention
Aiming at the defects of the prior art, the cantilever connecting structure for the Roots pump or the screw pump is provided, overcomes the defects of the prior art, is reasonable in design, ensures the rigidity and the whole performance of the cantilever rotor to the maximum extent by mutually matching the cantilever rotor positioning ring with the driving positioning sleeve and mutually matching the driving positioning sleeve with the driving shaft rotor, greatly reduces the machining requirement of the cantilever rotor, only needs to machine a molded line on the outer surface of the cantilever rotor, does not need to axially open a deep hole sleeve shaft, reduces the risk of deviation of concentric circles of the inner circle and the outer circle, does not need to use linear cutting to open a key slot, and simultaneously is convenient for carrying out anti-corrosion treatment on the machined cantilever rotor because the cantilever rotor only has the outer surface and no inner hole, and ensures the azimuth and the fastening by means of bolts and positioning pins on installation, and does not need to be embedded and matched with the rotor.
In order to achieve the above purpose, the application is realized by the following technical scheme:
the cantilever connection structure for the Roots pump or the screw pump comprises an outer shell, a bearing end cover, a driving shaft rotor and a cantilever rotor, wherein one end of the driving shaft rotor is fixedly connected with one side of a driving positioning sleeve through a locking bolt, a round boss is arranged at the inner circle of the other side of the driving positioning sleeve, and bolt holes are respectively formed at the outer circle of the other side of the driving positioning sleeve;
the cantilever rotor and the driving shaft rotor are coaxially arranged, the cantilever rotor comprises a linear rotor, a transition cylinder and a cantilever rotor positioning ring, one side of the linear rotor is coaxially connected with the cantilever rotor positioning ring through the transition cylinder, a groove is formed in the outer side surface of the cantilever rotor positioning ring, and the groove is in interference fit with the circular boss; the outer circle of the cantilever rotor positioning ring is fixedly connected with a bolt hole at the outer circle of the driving positioning sleeve through a fixing bolt;
the outer shell is sleeved outside the cantilever rotor, the bearing end cover is arranged on the outer surface of one side of the driving shaft rotor, which is close to the cantilever rotor, and is fixedly connected with the outer shell, a first step is arranged in the bearing end cover, a second step is arranged on the outer surface of the driving shaft rotor, a bearing cavity is arranged between the first step and the second step, a bearing is arranged in the bearing cavity, one side of the outer circle of the bearing is abutted against the first step in the axial direction, the other side of the outer circle of the bearing is abutted against the bearing gland, the bearing gland is fixed on the bearing end cover through bolts, one side of the inner circle of the bearing is abutted against the second step in the axial direction, and the other side of the inner circle of the bearing is abutted against the driving positioning sleeve.
Preferably, a wave spring is fixedly arranged between the outer surface of the circular boss and the inner surface of the groove.
Preferably, one side of the driving shaft rotor, which is close to the cantilever rotor, is provided with a flat key structure, a flat key hole is formed in the side surface of the driving positioning sleeve, and the driving positioning sleeve is matched with the flat key structure through the flat key hole.
Preferably, two first positioning pin holes are uniformly formed in the outer circle of the driving positioning sleeve, four second positioning pin holes are uniformly formed in the cantilever rotor positioning ring, and the second positioning pin holes are connected with the first positioning pin holes through positioning pins.
Preferably, the shell body cavity is provided with the sealing cover plate, the sealing cover plate passes through bolt fixed mounting at bearing end cover side surface, just first sealing washer and second sealing washer have been seted up in the middle of the sealing cover plate, first sealing washer and second sealing washer cup joint respectively at transition cylinder and cantilever rotor retainer plate surface.
Preferably, the sealing cover plate is equally divided into a first cover plate and a second cover plate from a middle horizontal line, bolt holes are formed in the side surfaces of the first cover plate and the second cover plate, and the first cover plate and the second cover plate are fixedly connected through bolts.
Preferably, the linear rotor, the transition cylinder and the cantilever rotor positioning ring are integrally designed.
Preferably, a protective gas channel is arranged below the bearing cavity and connected with an external protective gas pipeline, the bearing gland is in clearance fit with the driving positioning sleeve, and the sealing cover plate is in clearance fit with the cantilever rotor.
The application provides a cantilever connection structure for a Roots pump or a screw pump. The beneficial effects are as follows: the cantilever rotor positioning ring is matched with the driving positioning sleeve, and the groove is in interference fit with the circular boss, so that the cantilever rotor is positioned on the concentric shaft through the driving positioning sleeve and the driving shaft rotor, the cantilever rotor can maximally ensure the rigidity and maintain the integral performance of the cantilever rotor by adopting the installation mode, the machining requirement of the cantilever rotor is greatly reduced, a molded line is machined on the outer surface of the cantilever rotor, a deep hole sleeve shaft is not required to be axially formed, the risk of deviation of concentric circles of the inner circle and the outer circle is reduced, a key groove is not required to be formed by linear cutting, and meanwhile, the cantilever rotor is convenient to carry out anti-corrosion treatment on the machined cantilever rotor due to the fact that the cantilever rotor has only the outer surface and no inner hole, and the bearing degree and the fastening are ensured by virtue of bolts and positioning pins on installation, and the embedded fit of an extended shaft and the rotor is not required any more;
the driving shaft rotor and the driving positioning sleeve can play a role of reverse driving force when being locked through the wave spring, so that the locking bolt of the driving positioning sleeve is locked with the screw teeth in the bolt hole of the end face of the driving shaft rotor, the locking force is increased, the gap in the locking force is eliminated, and therefore looseness caused by high-speed rotation and vibration is avoided; the sealing cover plate ensures an end gap of the cantilever rotor.
Drawings
In order to more clearly illustrate the application or the technical solutions in the prior art, the drawings used in the description of the prior art will be briefly described below.
FIG. 1 is a schematic cross-sectional view of the present application;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic cross-sectional view of the driveshaft rotor during installation of the present application;
FIG. 4 is a schematic view of a cantilever rotor according to the present application;
FIG. 5 is a schematic cross-sectional view of a cantilever rotor according to the present application;
FIG. 6 is a schematic diagram of a driving positioning sleeve according to the present application;
FIG. 7 is a second schematic diagram of the driving positioning sleeve according to the present application;
FIG. 8 is a schematic view of a bearing gland according to the present application;
FIG. 9 is a schematic view of a seal cover plate according to the present application;
FIG. 10 is a schematic cross-sectional view of a seal cover plate according to the present application;
the reference numerals in the figures illustrate:
1. an outer housing; 2. a bearing end cap; 3. a drive shaft rotor; 4. a cantilever rotor; 5. a locking bolt; 6. driving the positioning sleeve; 7. a circular boss; 8. a wave spring; 9. a first step; 10. a second step; 11. a bearing cavity; 12. a bearing; 13. a bearing gland; 14. bolt holes; 15. a fixing bolt; 16. a first positioning pin hole; 17. a second dowel hole; 18. sealing the cover plate; 19. a first seal ring; 20. a second seal ring; 21. a shielding gas passage; 22. an air flow channel groove; 41. a linear rotor; 42. a transition cylinder; 43. cantilever rotor positioning ring; 44. a groove; 61. a flat key hole; 181. a first cover plate; 182. and a second cover plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings.
1-10, a cantilever connection structure for a Roots pump or a screw pump comprises an outer shell 1, a bearing end cover 2, a driving shaft rotor 3 and a cantilever rotor 4, wherein one end of the driving shaft rotor 3 is fixedly connected with one side of a driving positioning sleeve 6 through a locking bolt 5, a circular boss 7 is arranged at the inner circle of the other side of the driving positioning sleeve 6, and bolt holes 14 are respectively arranged at the outer circle of the other side of the driving positioning sleeve 6; the cantilever rotor 4 and the driving shaft rotor 3 are coaxially arranged, the cantilever rotor 4 comprises a linear rotor 41, a transition cylinder 42 and a cantilever rotor positioning ring 43, one side of the linear rotor 41 is coaxially connected with the cantilever rotor positioning ring 43 through the transition cylinder 42, a groove 44 is formed in the outer side surface of the cantilever rotor positioning ring 43, and the groove 44 is in interference fit with the circular boss 7; the outer circle of the cantilever rotor positioning ring 43 is fixedly connected with the bolt hole 14 at the outer circle of the driving positioning sleeve 6 through the fixing bolt 15; the outer shell 1 is sleeved outside the cantilever rotor 4, the bearing end cover 2 is arranged on the outer surface of one side of the driving shaft rotor 3, which is close to the cantilever rotor 4, and the bearing end cover 2 is fixedly connected with the outer shell 1, a first step 9 is arranged in the bearing end cover 2, a second step 10 is arranged on the outer surface of the driving shaft rotor 3, a bearing cavity 11 is arranged between the first step 9 and the second step 10, a bearing 12 is arranged in the bearing cavity 11, one side of the outer circle of the bearing 12 is abutted against the first step 9 in the axial direction, the other side of the outer circle of the bearing 12 is abutted against the bearing cover 13, the bearing cover 13 is fixed on the bearing end cover 2 through bolts, one side of the inner circle of the bearing 12 is abutted against the second step 10 in the axial direction, and the other side of the inner circle of the bearing 12 is abutted against the driving positioning sleeve 6.
Working principle:
in the application, the two ends of the driving shaft rotor 3 are respectively fixed and supported by two bearings, so that the driving shaft rotor 3 is very stable in high-speed rotation, and the jumping amplitude can meet the meshing of adjacent impellers. By mounting the bearing 12 in the bearing chamber 11 and fastening the outer circumference of the bearing 12 in the bearing chamber by means of the bearing cover 13 and the first step 9, the axial displacement of the driving shaft rotor 3 and the bearing 12 can only be in the direction of the second step 10 away from the bearing 12, since the bearing cover 2 is stationary. The driving positioning sleeve 6 is propped against the other side of the inner circle of the bearing 12 and is fastened with the bolt hole of the end face of the driving shaft rotor 3 through the locking bolt 5 of the driving positioning sleeve 6, so that the driving positioning sleeve 6 tightens the driving shaft rotor 3, and the driving shaft rotor 3 is locked in the axial direction at the moment because the outer circle of the bearing 12 is firmly fixed in the bearing end cover 2 and the bearing gland 13, so that the gap between the impeller on the driving shaft rotor 3 and the bearing end cover 2 is also determined; the mounting of the rear cantilever rotor 4 does not affect the clearance between the driving shaft rotor 3 and the bearing end cap 2 in the axial direction either.
So that one side of the driving shaft rotor 3 is at the fixed side, all axial gaps are fixed, and by the installation of the gear at the other side, the azimuth of all shafts of the non-cantilever rotor can be rapidly determined.
The cantilever rotor 4 comprises a linear rotor 41 with meshing linearity, and the linear rotor 41, a transition cylinder 42 and a cantilever rotor positioning ring 43 are integrally designed, and the cantilever rotor 4 is made of non-metal materials, so that the rigidity of the whole cantilever rotor is ensured; the cantilever rotor positioning ring 43 is matched with the driving positioning sleeve 6, and the groove 44 is in interference fit with the circular boss 7, so that the cantilever rotor 4 and the driving shaft rotor 3 are concentric through the driving positioning sleeve 6, and the cantilever rotor 4 can synchronously rotate at the same rotating speed and concentric circles when the driving shaft rotor 3 rotates.
The cantilever rotor 4 of the application adopts the installation mode, the rigidity of the cantilever rotor 4 can be ensured to the maximum extent, the integral performance is maintained, the machining requirement is greatly reduced, the mechanical machining of molded lines is only needed on the outer surface of the cantilever rotor 4, a deep hole sleeve shaft is not needed to be opened in the axial direction, the risk of deviation of concentric circles of the inner circle and the outer circle is reduced, a key groove is not needed to be opened by using linear cutting (the determination of the azimuth degree of the rotor is very inaccurate in the mode), meanwhile, the cantilever rotor 4 only has the outer surface and has no inner hole, the corrosion-resistant treatment is convenient for the cantilever rotor 4 after the machining, the azimuth degree and the fastening are ensured by virtue of bolts and positioning pins on the installation, and the embedded matching of an extended shaft and the rotor is not needed.
In the second embodiment, as a further preferable scheme of the first embodiment, a wave spring 8 is fixedly installed between the outer surface of the circular boss 7 and the inner surface of the groove 44. The driving shaft rotor 3 and the driving positioning sleeve 6 can play a role in reverse driving force during locking through the wave spring 8, so that the locking bolt 5 of the driving positioning sleeve 6 is locked with a screw tooth in a bolt hole on the end face of the driving shaft rotor 3, the locking force is increased, the gap in the locking force is eliminated, and loosening caused by high-speed rotation and vibration is avoided, and the locking nut is similar to a locking nut and a thrust washer with traditional structures. In this embodiment, the locking bolt 5 adopts an inner hexagon bolt structure, and preferably adopts a fine tooth bolt, so that the effect is more obvious.
In the third embodiment, as shown in fig. 6, as a further preferable scheme of the first embodiment, a side of the driving shaft rotor 3, which is close to the cantilever rotor 4, is provided with a flat key structure, a flat key hole 61 is formed in a side surface of the driving positioning sleeve 6, and the driving positioning sleeve 6 is matched with the flat key structure through the flat key hole 61. The driving shaft rotor 3 is inserted into the driving positioning sleeve 6 by utilizing a flat key groove formed by a flat key structure at one side of the driving shaft rotor 3, and the driving positioning sleeve 6 can be driven to rotate together better in the rotating process of the driving shaft rotor 3.
In the fourth embodiment, as a further preferable scheme of the first embodiment, 2 first positioning pin holes 16 of 180 ° are uniformly arranged at the outer circle of the driving positioning sleeve 6, 4 second positioning pin holes 17 of 90 ° are uniformly arranged on the cantilever rotor positioning ring 43, and two adjacent driving shaft rotors 3 must form a 90 ° plane angle in the gear determination azimuth (this is determined by the molded line of the meshing rotors, for example, if the driving shaft rotor is a two-lobe Roots rotor or forms 90 °, but if the driving shaft rotor is a three-lobe Roots rotor or forms 60 °, the cantilever rotor positioning ring has 6 positioning pin holes of 60 ° and only 3 positioning pin holes of 120 ° are formed on the driving positioning sleeve). And the azimuth of the cantilever rotor can be ensured through the dislocation of the locating pin, and finally the cantilever rotor is fastened through bolts. So that the cantilever rotor is tightly fastened with the driving positioning sleeve.
And through being provided with 4 second locating pin holes 17 that divide equally by 90 on cantilever rotor retainer plate 43, and on driving spacer sleeve 6 only 2 first locating pin holes 16 of 180, then the horizontal plane of two engaged cantilever rotors 4 must constitute 90 or 0 to very much be convenient for install cantilever rotor 4 (the meshing molded lines of this cantilever rotor is the horizontal intersection angle is 90), and when installing, do not need the non-cantilever rotor that has already installed need to carry out any azimuth readjustment again.
In the fifth embodiment, as shown in fig. 9 to 10, as a further preferable scheme of the first embodiment, for the Roots vacuum pump, the Roots blower, and the screw vacuum pump, the clearance of the rotor end face is an important parameter for determining the vacuum degree and the pumping amount, and if the clearance is too large, the vacuum degree is poor, and the pumping efficiency is obviously reduced. The cantilever rotor is not a meshed rotor at the end face of the positioning ring, and the applied gap cannot be reserved between the cantilever rotor and the end face.
Therefore, in order to solve the above problem, the inner cavity of the outer housing 1 is provided with the sealing cover plate 18, the sealing cover plate 18 is fixedly mounted on the side surface of the bearing end cover 2 through bolts, the first sealing ring 19 and the second sealing ring 20 are arranged in the middle of the sealing cover plate 18, and the first sealing ring 19 and the second sealing ring 20 are respectively sleeved on the outer surfaces of the transition cylinder 42 and the cantilever rotor positioning ring 43. The sealing cover 18 ensures an end play of the cantilever rotor.
In the sixth embodiment, as a further preferable scheme of the fifth embodiment, when the direction of the cantilever rotor and the bolts and the nuts are locked during installation, the connection between the cantilever rotor and the driving positioning sleeve must be installed first, and the sealing cover plate can only be installed after the installation is completed, and at this time, if the sealing cover plate is an integral cover plate, the sealing cover plate cannot be installed.
Therefore, in order to solve the above problems, the sealing cover plate 18 is equally divided into the first cover plate 181 and the second cover plate 182 from the middle horizontal line, three bolt holes are formed on the side surfaces of the first cover plate 181 and the second cover plate 182, and the first cover plate 181 and the second cover plate 182 are fixedly connected through bolts.
In actual installation, the first cover plate 181 and the second cover plate 182 are separated, the first cover plate 181 and the second cover plate 182 are respectively inserted from the upper part and the lower part of the cantilever rotor 4 which is already installed, the outer surface of the transition cylinder 42 and the outer surface of the cantilever rotor positioning ring 43 are just in clearance fit with the first sealing ring 19 and the second sealing ring 20 in the middle of the sealing cover plate 18, the first cover plate 181 and the second cover plate 182 are locked through bolts, the two sealing cover plates are fixedly installed on the side surface of the bearing end cover 2 through bolts when the outer circle of the cantilever rotor positioning ring 43 is guided downwards, the clearance between the sealing cover plate 18 and the end surface of the cantilever rotor 4 at the moment is determined through a clearance gauge, and if the clearance is too large or too small, the clearance can be adjusted through an adjusting gasket or a file.
In the seventh embodiment, as a further preferable embodiment of the fifth embodiment, in order to secure the corrosion resistance or dust of the cantilever rotor 4, particularly, the protection of the cantilever rotor connecting bolt hole and the cantilever rotor connecting drive positioning sleeve 6 and the bearing 12 is provided. By arranging the protective gas channel 21 below the bearing cavity 11, the protective gas channel 21 is connected with an external protective gas pipeline, the bearing gland 13 is in clearance fit with the driving positioning sleeve 6, and the sealing cover plate 18 is in clearance fit with the cantilever rotor 4.
In actual operation, the area from the bearing 12 to the cantilever rotor 4 is in a negative pressure state, so that the external protective gas with slight pressure or normal pressure fills the protective gas channel 21 through the external protective gas pipeline, and then permeates through the air channel groove 22 of the bearing gland 13 to be filled at one side of the bearing close to the cantilever rotor. The bearing gland 13 is in clearance fit with the driving positioning sleeve 6, and the sealing cover plate 18 is in clearance fit with the cantilever rotor 4, so that the protective gas can be filled into the cavities of the sealing cover plate 18 along with the clearance, and the cavities are the positions where the bolts of the cantilever rotor 4 are fastened, thereby playing a very good role in protection; finally, the protective gas can continuously permeate into the suction inlet of the cantilever rotor 4 and is discharged out of the pump body after being compressed with the process gas, thereby thoroughly ensuring the protection of the components such as bolts, bearings and the like which cannot be completely preserved from dust and corrosive gas. Because positive pressure gas permeates into the negative pressure cavity, the operation mode of the positive pressure air permeation type vacuum pump is completely different from that of an existing air curtain which is formed by front impact of exhaust gas and shielding gas of a screw pump or a Roots blower, and the problem that bearings on the exhaust port side of the existing screw pump, the Roots blower and a multistage dry vacuum pump are influenced by process media in the operation process is avoided.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (5)

1. A cantilever connection structure for roots pump or screw pump, its characterized in that: the novel driving device comprises an outer shell body (1), a bearing end cover (2), a driving shaft rotor (3) and a cantilever rotor (4), wherein one end of the driving shaft rotor (3) is fixedly connected with one side of a driving positioning sleeve (6) through a locking bolt (5), a round boss (7) is arranged at the inner circle of the other side of the driving positioning sleeve (6), and a bolt hole (14) is formed at the outer circle of the other side of the driving positioning sleeve (6);
the cantilever rotor (4) and the driving shaft rotor (3) are coaxially arranged, the cantilever rotor (4) comprises a linear rotor (41), a transition cylinder (42) and a cantilever rotor positioning ring (43), one side of the linear rotor (41) is coaxially connected with the cantilever rotor positioning ring (43) through the transition cylinder (42), a groove (44) is formed in the outer side surface of the cantilever rotor positioning ring (43), and the groove (44) is in interference fit with the circular boss (7); the outer circle of the cantilever rotor positioning ring (43) is fixedly connected with a bolt hole (14) at the outer circle of the driving positioning sleeve (6) through a fixing bolt (15);
the bearing end cover (2) is arranged on the outer surface of one side, close to the cantilever rotor (4), of the driving shaft rotor (3), the bearing end cover (2) is fixedly connected with the outer shell (1), a first step (9) is arranged in the bearing end cover (2), a second step (10) is arranged on the outer surface of the driving shaft rotor (3), a bearing cavity (11) is arranged between the first step (9) and the second step (10), a bearing (12) is arranged in the bearing cavity (11), one side of the outer circle of the bearing (12) is abutted against the first step (9) in the axial direction, the other side of the outer circle of the bearing (12) is abutted against a bearing gland (13), the bearing gland (13) is fixed on the bearing end cover (2) through bolts, one side of the inner circle of the bearing (12) is abutted against the second step (10) in the axial direction, and the other side of the inner circle of the bearing (12) is abutted against the driving positioning sleeve (6);
the inner cavity of the outer shell (1) is provided with a sealing cover plate (18), the sealing cover plate (18) is fixedly arranged on the side surface of the bearing end cover (2) through bolts, a first sealing ring (19) and a second sealing ring (20) are arranged in the middle of the sealing cover plate (18), and the first sealing ring (19) and the second sealing ring (20) are respectively sleeved on the outer surfaces of the transition cylinder (42) and the cantilever rotor positioning ring (43);
the sealing cover plate (18) is equally divided into a first cover plate (181) and a second cover plate (182) from a middle horizontal line, bolt holes are formed in the side surfaces of the first cover plate (181) and the second cover plate (182), and the first cover plate (181) and the second cover plate (182) are fixedly connected through bolts;
during installation, the first cover plate (181) and the second cover plate (182) are respectively inserted from the upper part and the lower part of the cantilever rotor (4), the first cover plate (181) and the second cover plate (182) are locked, the sealing cover plate is fixedly installed on the side surface of the bearing end cover 2 through bolts under the outer circle guide of the cantilever rotor positioning ring (43), and the gap between the sealing cover plate (18) and the end surface of the cantilever rotor (4) is determined;
the bearing comprises a bearing cavity (11), wherein a protective gas channel (21) is arranged below the bearing cavity, the protective gas channel (21) is connected with an external protective gas pipeline, a bearing gland (13) is in clearance fit with a driving positioning sleeve (6), and a sealing cover plate (18) is in clearance fit with a cantilever rotor (4).
2. A cantilever connection for a roots pump or screw pump according to claim 1, wherein: a wave spring (8) is fixedly arranged between the outer surface of the circular boss (7) and the inner surface of the groove (44).
3. A cantilever connection for a roots pump or screw pump according to claim 1, wherein: the driving shaft rotor (3) is arranged to be a flat key structure on one side close to the cantilever rotor (4), a flat key hole (61) is formed in the side surface of the driving positioning sleeve (6), and the driving positioning sleeve (6) is matched with the flat key structure through the flat key hole (61).
4. A cantilever connection for a roots pump or screw pump according to claim 1, wherein: two first positioning pin holes (16) are uniformly formed in the outer circle of the driving positioning sleeve (6), four second positioning pin holes (17) are uniformly formed in the cantilever rotor positioning ring (43), and the second positioning pin holes (17) are connected with the first positioning pin holes (16) through positioning pins.
5. A cantilever connection for a roots pump or screw pump according to claim 1, wherein: the linear rotor (41), the transition cylinder (42) and the cantilever rotor positioning ring (43) are integrally designed.
CN202110968632.7A 2021-08-23 2021-08-23 Cantilever connection structure for Roots pump or screw pump Active CN113606131B (en)

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CN202110968632.7A CN113606131B (en) 2021-08-23 2021-08-23 Cantilever connection structure for Roots pump or screw pump

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CN113606131B true CN113606131B (en) 2023-08-25

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11270483A (en) * 1998-03-23 1999-10-05 Taiko Kikai Industries Co Ltd Dry vacuum pump
CN205744434U (en) * 2016-06-16 2016-11-30 复盛实业(上海)有限公司 A kind of semi-closed screw type compressor cantilever shaft coupling anti-loosing mechanism
CN108591050A (en) * 2018-04-08 2018-09-28 奥戈恩（广州）泵业有限公司 A kind of impeller pump
CN209261823U (en) * 2017-04-11 2019-08-16 浙江凯立特真空科技有限公司 One kind is every dirty Roots vaccum pump
CN112443483A (en) * 2019-09-04 2021-03-05 复盛实业(上海)有限公司 Roots blower
CN112963343A (en) * 2021-03-30 2021-06-15 陕西德立机电科技有限公司 Low-noise gear pump
CN113048056A (en) * 2021-03-18 2021-06-29 上海樊容工业技术中心 Cantilever hybrid dry vacuum pump

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11270483A (en) * 1998-03-23 1999-10-05 Taiko Kikai Industries Co Ltd Dry vacuum pump
CN205744434U (en) * 2016-06-16 2016-11-30 复盛实业(上海)有限公司 A kind of semi-closed screw type compressor cantilever shaft coupling anti-loosing mechanism
CN209261823U (en) * 2017-04-11 2019-08-16 浙江凯立特真空科技有限公司 One kind is every dirty Roots vaccum pump
CN108591050A (en) * 2018-04-08 2018-09-28 奥戈恩（广州）泵业有限公司 A kind of impeller pump
CN112443483A (en) * 2019-09-04 2021-03-05 复盛实业(上海)有限公司 Roots blower
CN113048056A (en) * 2021-03-18 2021-06-29 上海樊容工业技术中心 Cantilever hybrid dry vacuum pump
CN112963343A (en) * 2021-03-30 2021-06-15 陕西德立机电科技有限公司 Low-noise gear pump

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