Vacuum pump rotor assembly device

Abstract

The present invention belongs to the technical field of mechanical transmission devices, and specifically relates to a vacuum pump rotor assembly device, including a base, a top plate, a positioning block, a fixed retainer, a pair of positioning sleeves, and a clamping ring, an axial transmission part, an axial drive rod and a bevel gear respectively matched on the two positioning sleeves. A transmission column is formed at the lower part of the positioning sleeve. Two vertical through holes are formed on the top plate and the positioning block. The upper part of the positioning sleeve is pivotally matched with the vertical shaft hole on the fixed retainer, and the transmission column extends downward. The hydraulic positioning surface on the hydraulic positioning part provided in the positioning sleeve is coaxial with the axial cavity of the transmission column. The clamping ring is fixed to the upper end of the positioning sleeve. The axial drive rod can push the axial transmission part upward. The bevel gear is fixed on the transmission column and can mesh. On the transmission column, a plurality of radial through holes are provided at a position relatively located at the lower part of the bevel gear. The present invention can realize the adjustment of the radial, axial and angular assembly clearances of the rotor, which helps to improve the assembly efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission devices, and in particular to a vacuum pump rotor assembly device. Background Art

[0002] The twin-screw vacuum pump is a commonly used vacuum pumping equipment with the advantages of compact structure, high efficiency and low noise. The main structure of the twin-screw vacuum pump consists of two intermeshing screws, one of which is the active screw and the other is the driven screw. When the active screw rotates, the driven screw will rotate with it, and the external gas will be extracted into the pump chamber, and the gas will be discharged following the rotation of the screw, so the two screws can be collectively referred to as rotors. In the rotor design of the twin-screw vacuum pump, the rationality of the meshing gap between the rotors has an important influence on the performance and working stability of the pump. The rationality of the meshing gap between the rotors can ensure the smooth rotation of the screw, reduce the leakage in the pump, and improve the extraction efficiency of the pump. Too small or too large meshing gap will have an adverse effect on the working performance of the screw vacuum pump. That is, the control of the meshing gap of the rotor of the twin-screw vacuum pump is an important link to ensure its working performance and stability. Controlling the meshing gap between the rotors can reduce the leakage of the pump, improve the extraction efficiency, and extend the service life of the pump.

[0003] During the rotor assembly and maintenance of the twin-screw vacuum pump, the assembly gap between the rotors will be adjusted. In the past, the assembly gap between the rotors was mainly guaranteed by the workers' assembly experience, and the assembly was completed after a rough test. The main shortcomings are low assembly efficiency, difficulty in meeting high-precision assembly requirements, difficulty in controlling the consistency of assembly accuracy, and difficulty in simultaneously ensuring the radial, axial and angular assembly accuracy between the rotors. Especially after maintenance and assembly, the working efficiency of the vacuum pump is likely to be significantly reduced. Summary of the invention

[0004] The present invention provides a vacuum pump rotor assembly device, which can adjust the radial, axial and angular assembly clearances of the rotor, thereby helping to improve assembly efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a vacuum pump rotor assembly device, including a top plate fixed on the upper part of the base, a positioning block correspondingly arranged above the top plate, a fixed retaining frame fixed on the lower end surface of the top plate and extending downward into the box cavity of the base, a pair of positioning sleeves, and clamping rings, axial transmission parts, axial drive rods and bevel gears respectively matched on the two positioning sleeves.

[0006] A transmission column is formed at the lower part of the positioning sleeve, and a threaded through hole with an axis along the vertical direction is formed at the lower end of the transmission column.

[0007] Two vertical through holes arranged alternately on the left and right are respectively formed on the top plate and the positioning block. After assembly, the two vertical through holes on the top plate can correspond to the right below the two vertical through holes on the positioning block.

[0008] The fixed holder is formed with vertical shaft holes corresponding to the vertical through holes on the top plate, the upper parts of the two positioning sleeves are respectively matched with the vertical shaft holes, and the upper parts of the positioning sleeves are respectively extended into the two vertical through holes on the top plate, and the two transmission columns are extended downward relative to the fixed holder. The vertical shaft hole is a stepped cavity, and a bearing is provided at the end position where the positioning sleeve matches the vertical shaft hole, so that the two positioning sleeves can rotate around the vertical axis relative to the fixed holder.

[0009] A hydraulic positioning part is provided in the positioning sleeve, so that the cylindrical hydraulic positioning surface on the hydraulic positioning part is coaxial with the shaft cavity of the transmission column and the inner diameter of the former is larger than the inner diameter of the latter, that is, the inner diameter of the hydraulic positioning surface is larger than the inner diameter of the shaft cavity of the transmission column.

[0010] The two clamping rings are respectively fixed on the upper end surfaces of the two positioning sleeves, and the axial holes of the clamping rings correspond to the upper part of the axial cavity of the positioning sleeves, so that the axial holes on the clamping rings and the axial cavity of the positioning sleeves can form a cavity structure that penetrates vertically. In other words, the hydraulic positioning surface and the axial holes on the clamping rings form a vertically penetrating cavity structure.

[0011] The axial transmission part includes a push plate and a rotary shaft rod, and the push plate is placed at the inner bottom of the hydraulic positioning surface, and the rotary shaft rod is placed in the shaft cavity of the transmission column, and the upper end of the rotary shaft rod can contact the lower end surface of the push plate.

[0012] The axial driving rod matches with the threaded through hole on the transmission column, and can push the rotating shaft rod upward to move the push plate.

[0013] The bevel gears are respectively fixed on the two transmission columns so that the two bevel gears can mesh.

[0014] A plurality of radial through holes are arranged on the transmission column at a position relatively located at the lower part of the helical gear.

[0015] The connection modes between the top plate and the base, between the fixed retainer and the top plate, and between the positioning sleeve and the clamping ring are all detachable connection modes, and specifically can be connection modes in which fixed connection is established by bolts.

[0016] Because the two vertical through holes on the positioning block correspond to the shaft bodies on the upper parts of the two matching rotors, and the two vertical through holes on the top plate correspond to the upper parts of the positioning sleeves, the inner diameters of the two vertical through holes on the positioning block may be different from those of the two vertical through holes on the top plate.

[0017] Optionally, a pair of clamping sleeves are further included and the two clamping sleeves are fixedly mounted on the two transmission columns. An annular wedge surface extending obliquely upward and an annular wedge surface extending obliquely downward are formed on the outer circumferential surface of the clamping sleeve, and the two annular wedge surfaces are arranged relatively up and down. The inner circumferential surface of the helical gear corresponds to and matches the two annular wedge surfaces on the outer circumferential surface of the clamping sleeve, so that the helical gear is fixed on the clamping sleeve. With the help of the matching of the two wedge surfaces on the clamping sleeve and the helical gear, on the one hand, the torque can be increased by the cooperation between the helical gear and the two annular wedge surfaces, and on the other hand, it also plays a bidirectional synchronous locking role to ensure that the meshing angle between the helical gears will not produce a slight displacement with the clamping sleeve.

[0018] Optionally, a countersunk portion with an arc-shaped inner bottom surface is formed at the center position on the lower end surface of the push plate, and correspondingly, the upper end of the rotary shaft is formed into a tip and the tip extends into the countersunk portion on the lower end surface of the push plate.

[0019] Optionally, the hydraulic positioning portion includes an outer sleeve, a steel expansion sleeve and a pressurized screw portion.

[0020] The upper end of the outer sleeve is formed with a radial flange and a flange sleeve is fixedly arranged outside the radial flange. The outer sleeve and the flange sleeve are fixedly assembled on the upper part of the positioning sleeve, so that the outer sleeve extends into the sleeve cavity of the positioning sleeve, and the relative circumferences of the two are in contact and matched.

[0021] A piston cavity is formed on the radial flange of the outer sleeve. At least one axial oil passage is formed on the side wall of the outer sleeve, and the upper part of the axial oil passage is connected to the inner bottom of the piston cavity. On the side wall of the outer sleeve, a connecting oil passage is formed at the lower position of the inner circumferential surface to connect the lower part of the axial oil passage with the barrel cavity of the outer sleeve. In this way, the piston cavity and the barrel cavity of the outer sleeve can be connected by means of the axial oil passage and the connecting oil passage to form an oil passage.

[0022] The steel expansion sleeve is inserted into the barrel cavity of the outer sleeve from the lower port of the outer sleeve and fixedly matched with the outer sleeve. A plurality of connecting grooves are formed alternately around the circumferential direction on the outer circumferential surface of the steel expansion sleeve, so that the connecting grooves extend in the axial direction. Annular oil grooves are formed on the outer circumferential surface of the steel expansion sleeve and at the upper and lower ends of the corresponding connecting grooves.

[0023] The communicating oil passage on the outer sleeve can be directly communicated with the annular oil groove located relatively at the lower part.

[0024] Hydraulic oil is filled in the piston cavity, the axial oil passage, the connecting oil passage, the annular oil groove and the connecting groove.

[0025] The pressurizing screw part includes a screw and a piston sealing block. The piston sealing block is matched and arranged in the piston cavity and fixed on the rod end of the screw. The screw matches the radial threaded through hole arranged on the flange sleeve.

[0026] The screw is screwed to change the matching position between it and the radial threaded through hole on the flange sleeve in the radial direction. The hydraulic oil pressure generated by squeezing the hydraulic oil can drive the inner diameter of the steel expansion sleeve to change, even if the inner diameter of the hydraulic positioning surface changes, and the shaft body located at the bottom of the rotor can be clamped to different degrees.

[0027] Optionally, a ribbed hole is formed on the end surface of the nut of the screw rod, a countersunk hole is formed on the bottom surface of the ribbed hole, and a connecting bolt is provided in the countersunk hole to fix the piston sealing block and the screw rod into a whole.

[0028] The beneficial effect of the present invention is that the vacuum pump rotor assembly device provided by the present invention can quickly complete the assembly of the rotor, realize the comprehensive adjustment and fixation of the radial, axial and angular matching positions of the rotor, for subsequent testing, and is convenient for testing the operating performance of the rotor in the adjusted state. Therefore, the present invention helps to improve the assembly accuracy between rotors, enhance the operating performance of the vacuum pump, and also helps to ensure the stability and consistency of the rotor assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the appearance structure of the present invention and two rotors in a matching state.

[0030] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0031] Figure 3 for Figure 2 Schematic diagram of the cross-section structure at AA (no positioning block is configured).

[0032] Figure 4 It is a schematic diagram of the appearance structure of the hydraulic positioning part when its steel expansion sleeve is partially pulled out to the outside of the outer sleeve.

[0033] Figure 5 It is a schematic diagram of the cross-sectional structure of the hydraulic positioning part.

[0034] Figure 6 for Figure 5 The cross-sectional structure diagram of the hydraulic positioning part assembled on the positioning sleeve is shown.

[0035] In the figure: 10 base; 20 top plate; 30 fixed retainer; 40 positioning sleeve, 41 transmission column, 411 threaded through hole, 412 radial through hole, 42 hydraulic positioning surface; 1 outer sleeve, 11 piston cavity, 12 axial oil channel, 13 connecting oil channel, 14 flange sleeve, 141 radial threaded through hole; 2 steel expansion sleeve, 21 annular oil groove, 22 connecting groove; 3 pressurized screw part, 31 screw, 311 ridge hole, 312 countersunk hole, 32 piston sealing block; 50 clamping ring, 51 shaft hole; 60 axial transmission part, 61 push plate, 62 rotary shaft; 70 axial drive rod; 80 clamping sleeve; 90 helical gear; 100 rotor, 101 positioning block. DETAILED DESCRIPTION

[0036] The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention. At the same time, the terms such as "upper", "lower", "front", "back", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical contents.

[0037] like Figures 1 to 3 A vacuum pump rotor assembly device shown in the figure includes a top plate 20 fixed on the upper part of a base 10, a positioning block 101 correspondingly arranged above the top plate 20, a fixed retaining frame 30 fixed on the lower end surface of the top plate 20 and extending downward into the box cavity of the base 10, a pair of positioning sleeves 40, and clamping rings 50, axial transmission parts 60, axial drive rods 70, clamping sleeves 80 and bevel gears 90 matched on the two positioning sleeves 40, that is, each positioning sleeve 40 is matched with a group of clamping rings 50, axial transmission parts 60, axial drive rods 70, clamping sleeves 80 and bevel gears 90.

[0038] A transmission column 41 is formed at the lower part of the positioning sleeve 40, and a threaded through hole 411 with an axis extending in the vertical direction is formed at the lower end of the transmission column 41. The positioning sleeve 40 and the transmission column 41 can be an integrally formed structure, and the axis centerline of the shaft cavity of the positioning sleeve 40 is coaxial with the axis centerline of the shaft cavity on the transmission column 41, both extending in the vertical direction, and the shaft cavities of the two are formed into a multi-stage shaft hole structure.

[0039] Two vertical through holes arranged alternately on the left and right are formed on the top plate 20 and the positioning block 101. After being assembled with two matching rotors 100, the two vertical through holes on the top plate 20 can correspond to the two vertical through holes on the positioning block 101 respectively. Specifically, the positioning block 101 is matched with the upper shaft of the rotor 100, and the upper shaft ends of the two rotors 100 are respectively sleeved in the two vertical through holes on the positioning block 101, and a clearance fit is formed between the vertical through holes of the positioning block 101 and the upper shaft of the rotor 100, so as to achieve the purpose of connecting the upper parts of the two rotors 100 as a whole through the positioning block 101. The axial direction of the rotor 100 is arranged along the vertical direction, and the lower shaft end of the rotor 100 is matched with the clamping ring 50 and the positioning sleeve 40.

[0040] The fixed retainer 30 is formed with vertical shaft holes corresponding to the vertical through holes on the top plate 20, and the upper parts of the two positioning sleeves 40 are pivotally matched with the vertical shaft holes. The upper ends of the positioning sleeves 40 are respectively extended into the two vertical through holes on the top plate 20, and the two transmission columns 41 are both extended downward relative to the lower end of the fixed retainer 30 and extend below the lower end surface of the fixed retainer 30. After the positioning sleeves 40 are respectively assembled on the fixed retainer 30, bearings are matched at both ends between the relative circumferences of the positioning sleeves 40 and the fixed retainer 30, so that the positioning sleeves 40 can rotate around the vertical axis relative to the fixed retainer 30.

[0041] On the positioning sleeve 40, at the portion corresponding to the fixed retainer 30, a hydraulic positioning part is fixedly provided in its sleeve cavity. In other words, a hydraulic positioning part is sealed and fixedly arranged in the sleeve cavity of the positioning sleeve 40. After assembly, the cylindrical hydraulic positioning surface 42 on the hydraulic positioning part is coaxial with the shaft cavity on the transmission column 41, and the inner diameter of the former is larger than the inner diameter of the latter, that is, the inner diameter of the hydraulic positioning surface 42 is larger than the inner diameter of the shaft cavity on the transmission column 41, and generally the former is at least 2 to 5 times the latter.

[0042] The lower shaft body of the rotor 100 can extend into the hydraulic positioning surface 42, so that when the radial size of the hydraulic positioning surface 42 changes, different degrees of radial force can be applied to the lower shaft body of the rotor 100, and the lower shaft body of the rotor 100 is held by the hydraulic positioning surface, which can be used to adjust and fix the assembly state of the rotor 100.

[0043] The clamping ring 50 is fixed on the upper end surface of the two positioning sleeves 40 respectively, so that the axial hole 51 of the clamping ring 50 corresponds to the axial cavity of the positioning sleeve 40. During operation, the lower shaft body of the rotor 100 can pass through the axial hole 51 of the clamping ring 50 and extend into the hydraulic positioning surface 42 on the two positioning sleeves 40 respectively. In the initial state, the axial hole 51 of the clamping ring 50 and the lower shaft body of the rotor 100 are in a clearance fit relationship. After the radial, axial and angular positions of the two matching rotors 100 are relatively adjusted, the axial hole 51 on the clamping ring 50 can be rigidly connected with the lower shaft body of the rotor 100. For example, by reducing the inner diameter of the axial hole 51, the clamping ring 50 and the lower shaft body of the rotor 100 can establish a rigid connection relationship to achieve rigid fixation.

[0044] During operation, the radial positioning process of the hydraulic positioning surface 42 and the clamping ring 50 is linked. While the clamping ring 50 clamps the rotor 100, the hydraulic positioning surface 42 also reduces its diameter synchronously to hold the lower shaft of the rotor 100 tightly, thereby gradually achieving radial positioning adjustment.

[0045] The axial transmission part 60 includes a push plate 61 and a rotary shaft 62, and the push plate 61 is placed at the inner bottom position of the hydraulic positioning surface 42, and the rotary shaft 62 is placed in the shaft cavity of the transmission column 41, and the upper end of the rotary shaft 62 can contact the lower end surface of the push plate 61. The outer diameter of the push plate 61 is not greater than the minimum inner diameter of the hydraulic positioning surface 42.

[0046] On the lower end surface of the push plate 61, a countersunk portion with an arc-shaped inner bottom surface is formed at the center position. Correspondingly, the upper end of the rotary shaft 62 is formed into a tip and the tip extends into the countersunk portion on the lower end surface of the push plate 61, see Figure 3 Such a structural design can improve the effect of the force exerted by the rotary shaft 62 on the push plate 61 and improve the axial positioning adjustment accuracy.

[0047] The axial driving rod 70 matches with the threaded through hole 411 on the transmission column 41 , and can push the rotating shaft 62 upward to move the push plate 61 .

[0048] The clamping sleeve 80 is fixedly mounted on the transmission column 41, and an annular wedge surface extending upward and an annular wedge surface extending downward are formed on the outer circumference of the clamping sleeve 80. The inner circumference of the bevel gear 90 corresponds to and matches the two annular wedge surfaces on the outer circumference of the clamping sleeve 80, and the bevel gear 90 is fixedly clamped on the clamping sleeve 80. After the two wedge surfaces (i.e., annular wedge surfaces) on the outer circumference of the clamping sleeve 80 match the inner circumference of the bevel gear 90, on the one hand, the torque can be increased by the cooperation between the bevel gear 90 and the two annular wedge surfaces, and on the other hand, it also plays a bidirectional synchronous locking role to ensure that the meshing angle between the bevel gears 90 will not produce a slight displacement as the clamping sleeve 80 is locked, which helps to ensure the adjustment accuracy. Therefore, the clamping sleeve 80 can be called a wedge-shaped bidirectional clamping sleeve.

[0049] After assembly, the two bevel gears 90 mesh with each other, and when the bevel gears 90 are driven to rotate by an external driving device, the transmission column 41 can be driven to drive the positioning sleeve 40 to rotate around the vertical axis, thereby adjusting the angular / circumferential positioning status / clearance between the rotors 100.

[0050] A plurality of radial through holes 412 are provided on the transmission column 41 at a position relatively located below the bevel gear 90. During operation, a rotating shaft (a special tool) is inserted into the radial through hole 412, and the rotating shaft is driven to rotate, so that the radial position of the upper end of the axial drive rod 70 can be manually adjusted and fixed. An internal thread can be arranged on the inner wall of the radial through hole 412, and matched with the external rotating shaft to generate threaded thrust.

[0051] An annular groove is formed on the outer peripheral surface of the axial driving rod 70 at an axial position corresponding to the radial through hole 412, see Figure 3 .

[0052] The connection between the top plate 20 and the base 10, between the fixing holder 30 and the top plate 20, and between the positioning sleeve 40 and the clamping ring 50 are all detachable connection modes, and specifically, they can be fixedly connected by bolts as shown in the figure.

[0053] like Figure 4 , Figure 5 As shown, the hydraulic positioning part includes an outer sleeve 1, a steel expansion sleeve 2 (or hydraulic expansion sleeve) and a pressurized screw part 3.

[0054] The upper end of the outer sleeve 1 is formed with an annular radial flange and a flange sleeve 14 is fixedly provided outside the radial flange. After the outer sleeve 1 and the flange sleeve 14 are fixedly connected as a whole, they are assembled on the upper part of the positioning sleeve 40, so that the outer sleeve 1 extends into the multi-step sleeve cavity / multi-step shaft cavity of the positioning sleeve 40, and the relative surfaces of the two are in contact and matched.

[0055] A piston chamber 11 is formed on the radial flange of the outer sleeve 1. At least one axial oil passage 12 is formed on the side wall of the outer sleeve 1, and the upper part of the axial oil passage 12 is communicated with the inner bottom of the piston chamber 11.

[0056] On the side wall of the outer sleeve 1, a connecting oil passage 13 is formed at the lower position of the inner circumference surface to connect the lower part of the axial oil passage 12 with the barrel cavity of the outer sleeve 1. In this way, the piston cavity 11 can be connected with the barrel cavity of the outer sleeve 1 by means of the axial oil passage 12 and the connecting oil passage 13 to form an oil passage.

[0057] The steel expansion sleeve 2 is inserted into the barrel cavity of the outer sleeve 1 from the lower port of the outer sleeve 1, and forms a sealed and fixed matching relationship with the outer sleeve 1, so that the hydraulic oil is not easily leaked to the outside from between the matching circumferential surfaces of the two.

[0058] A plurality of connecting grooves 22 are formed on the outer circumferential surface of the steel expansion sleeve 2 in an alternate manner around the circumferential direction, so that the connecting grooves 22 extend in the axial direction. At the same time, annular oil grooves 21 are formed on the outer circumferential surface of the steel expansion sleeve 2 and correspond to the upper and lower ends of the connecting grooves 22. The radial depth of the annular oil groove 21 is greater than the radial depth of the connecting groove 22, and the former is generally 3 to 15 times the radial depth of the latter. The connecting oil passage 13 on the outer sleeve 1 can be directly connected to the annular oil groove 21 located relatively at the lower part, and can be indirectly connected to the annular oil groove 21 located relatively at the upper part through the connecting groove 22.

[0059] The piston chamber 11 , the axial oil passage 12 , the connecting oil passage 13 , the annular oil groove 21 and the connecting groove 22 are all filled with hydraulic oil.

[0060] The pressurizing screw part 3 includes a screw 31 and a piston sealing block 32. The piston sealing block 32 is matched and arranged in the piston cavity 11 and fixed to the end of the rod body of the screw 31. The screw 31 is matched with the radial threaded through hole 141 arranged on the flange sleeve 14.

[0061] The screw rod 31 is screwed to change the matching position between it and the radial threaded through hole 141 on the flange sleeve 14, so that the piston sealing block 32 can be driven to move relative to the piston chamber 11, thereby forcing the hydraulic oil in the piston chamber 11 to flow out and flow back, so that the internal pressure of the hydraulic oil accumulated in the piston chamber 11, the axial oil passage 12, the connecting oil passage 13, the annular oil groove 21 and the connecting groove 22 changes. The inner diameter of the steel expansion sleeve 2 (i.e., the inner diameter of the hydraulic positioning surface 42) can be driven to change by means of the changed hydraulic oil pressure. Figure 5 The referenced d1 decreases to d2, or increases from d2 to d1.

[0062] An angular hole 311 is formed on the nut end surface of the screw rod 31 , a countersunk hole 312 is formed on the bottom surface of the angular hole 311 , and a connecting bolt is provided in the countersunk hole 312 to fix the piston sealing block 32 and the screw rod 31 into a whole.

[0063] During use, the upper shaft bodies of the two matching rotors 100 are connected by the positioning block 101, so that the vertical through hole on the positioning block 101 is in clearance with the shaft body on the upper part of the rotor 100, and the positioning block 101 can slide up and down relative to the rotor 100. The shaft rods at the lower part of the two rotors 100 are respectively matched with the shaft holes 51 on the two clamping rings 50, and in the initial state, there is also a clearance matching relationship between the shaft holes 51 and the shaft body at the lower part of the rotor 100. Because the clamping ring 50 is fixedly connected to the positioning sleeve 40, and the positioning sleeve 40 is fixed to the fixed retaining frame 30, the lower part of the rotor 100 can be fixed by matching the rotor 100 with the two clamping rings 50. After the shaft rod at the lower part of the rotor 100 passes through the shaft hole 51, it extends into the hydraulic positioning surface 42 of the positioning sleeve 40 or extends into the shaft cavity of the steel expansion sleeve 2, thereby completing the connection and installation process between the rotor 100 and the present invention. Next, the axial position of the rotor 100 and the axial assembly gap between the rotors 100 are adjusted by driving the rotating shaft rod 62 to move through the axial drive rod 70. During this period, the direction of the force of the axial drive rod 70 pushing the rotating shaft rod 62 can be adjusted through the radial through hole 412. The radial assembly gap of the rotor 100 is adjusted by regulating the size change of the inner diameter of the hydraulic positioning surface 42 and the vertical position of the clamping ring 50. By driving the two bevel gears 90 to rotate to make the positioning sleeve 40 carry the rotor 100 to rotate, the angular / circumferential assembly position / gap between the rotors 100 can be adjusted. After the adjustment is completed, the hydraulic positioning surface 42 and the clamping ring 50 can fix the lower part of the rotor 100, and the top plate 20 can be removed from the base 10, and then the rotor 100, the fixed retainer 30, etc. are moved and installed on the double wall plate (components on the vacuum pump). After being fixedly connected with the double wall plate, the clamping ring 50 is loosened, so that the rotor 100 and the double wall plate are connected as a whole, and the experimental data can be transmitted to the double wall plate, and the first-order assembly of the vacuum pump rotor can be completed.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. The present invention can be improved in many aspects without violating the overall concept, and those familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A vacuum pump rotor assembly device, characterized in that: It comprises a top plate (20) fixed on a base (10), a positioning block (101) correspondingly arranged above the top plate (20), a fixed retaining frame (30) fixed on the lower end surface of the top plate (20) and extending downward into a box cavity of the base (10), a pair of positioning sleeves (40), and clamping rings (50) respectively matched and arranged on the two positioning sleeves (40), an axial transmission part (60), an axial driving rod (70) and a bevel gear (90); A transmission column (41) is formed at the lower portion of the positioning sleeve (40), and a threaded through hole (411) is formed at the lower end of the transmission column (41); Two vertical through holes are formed on the top plate (20) and the positioning block (101), respectively; two vertical shaft holes corresponding to the vertical through holes on the top plate (20) are formed on the fixed retaining frame (30); the upper parts of the two positioning sleeves (40) are respectively pivotally matched with the vertical shaft holes, so that the upper parts of the positioning sleeves (40) extend into the vertical through holes on the top plate (20), and the transmission columns (41) extend downward relative to the fixed retaining frame (30); A hydraulic positioning portion is provided on the positioning sleeve (40), so that a cylindrical hydraulic positioning surface (42) on the hydraulic positioning portion is coaxial with the shaft cavity of the transmission column (41), and the inner diameter of the former is larger than the inner diameter of the latter; The clamping ring (50) is fixed on the upper end surface of the positioning sleeve (40); The axial transmission part (60) comprises a push plate (61) and a rotary shaft (62); the push plate (61) is disposed at the inner bottom of the hydraulic positioning surface (42); the rotary shaft (62) is disposed in the shaft cavity of the transmission column (41) so that the upper end of the rotary shaft (62) can contact the lower end surface of the push plate (61); The axial drive rod (70) matches the threaded through hole (411) on the transmission column (41) and can push the rotary shaft (62) upward; The bevel gears (90) are respectively fixed on the two transmission columns (41) so that the two bevel gears (90) are meshed with each other; A plurality of radial through holes (412) are provided on the transmission column (41) at a position relatively located below the helical gear (90); The connection modes between the top plate (20) and the base (10), between the fixed retaining frame (30) and the top plate (20), and between the positioning sleeve (40) and the clamping ring (50) are all detachable connection modes.

2. The vacuum pump rotor assembly device according to claim 1, characterized in that: It also includes a pair of clamping sleeves (80) and the two clamping sleeves (80) are respectively fixedly sleeved on the two transmission columns (41); an annular wedge surface extending obliquely upward and an annular wedge surface extending obliquely downward are formed on the outer circumferential surface of the clamping sleeve (80); the inner circumferential surface of the bevel gear (90) corresponds to and matches the two annular wedge surfaces on the outer circumferential surface of the clamping sleeve (80), so that the bevel gear (90) is fixed on the clamping sleeve (80).

3. The vacuum pump rotor assembly device according to claim 1, characterized in that: A countersunk portion having an arc-shaped inner bottom surface is formed at a central position on the lower end surface of the push plate (61); correspondingly, the upper end of the rotary shaft (62) is formed into a tip and the tip extends into the countersunk portion on the lower end surface of the push plate (61).

4. The vacuum pump rotor assembly device according to any one of claims 1 to 3, characterized in that: The hydraulic positioning part comprises an outer sleeve (1), a steel expansion sleeve (2) and a pressurized screw part (3), and the inner circumferential surface of the steel expansion sleeve (2) is the hydraulic positioning surface (42); A radial flange is formed at the upper end of the outer sleeve (1), and a flange sleeve (14) is fixedly provided outside the radial flange; the outer sleeve (1) and the flange sleeve (14) are fixedly assembled on the upper part of the positioning sleeve (40); a piston chamber (11) is formed on the radial flange of the outer sleeve (1); an axial oil passage (12) is formed on the side wall of the outer sleeve (1), and the upper part of the axial oil passage (12) is connected to the piston chamber (11); a connecting oil passage (13) is formed on the side wall of the outer sleeve (1) at a lower position of the inner circumferential surface; The steel expansion sleeve (2) is inserted into the barrel cavity of the outer sleeve (1) from the lower end of the outer sleeve (1) and is sealed and fixedly matched with the outer sleeve (1); a plurality of communication grooves (22) are formed alternately around the circumferential direction on the outer circumferential surface of the steel expansion sleeve (2), so that the communication grooves (22) extend in the axial direction; annular oil grooves (21) are respectively formed on the outer circumferential surface of the steel expansion sleeve (2) and at the upper and lower ends of the communication grooves (22); and the communication oil passage (13) can be directly connected to the lower annular oil groove (21); Hydraulic oil is filled in the piston chamber (11), the axial oil passage (12), the connecting oil passage (13), the annular oil groove (21) and the connecting groove (22); The pressurizing screw portion (3) comprises a screw (31) and a piston sealing block (32); the piston sealing block (32) is matched and arranged in the piston cavity (11) and fixed to the end of the rod body of the screw (31); the screw (31) matches a radial threaded through hole (141) provided on the flange sleeve (14); screwing the screw (31) can drive the piston sealing block (32) to move relative to the piston cavity (11), thereby causing the hydraulic oil pressure to change, thereby causing the inner diameter of the steel expansion sleeve (2) to change.

5. The vacuum pump rotor assembly device according to claim 4, characterized in that: An angular hole (311) is formed on the end surface of the nut of the screw rod (31), a countersunk hole (312) is formed on the bottom surface of the angular hole (311), and a connecting bolt is provided in the countersunk hole (312) to fix the piston sealing block (32) and the screw rod (31) into a whole.

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