Roots vacuum pump rotor assembly centering tool

Abstract

The utility model relates to the technical field of vacuum pumps, in particular to a Roots vacuum pump rotor assembly centering tool which comprises a pair of connecting plates, the two ends of the pair of connecting plates are fixedly connected with a bottom plate and a supporting plate through fixed connecting structures respectively, and a pair of rotor anti-rotating pins is fixedly arranged at the top of the bottom plate. The bottom support adopts the spring to ensure that the rotors and the bottom surface of the bearing end plate are tightly attached and concentric, the working clearance of the rotors can be more accurately adjusted during pump body assembly, the pin and the fixing ring ensure that the centers of the two rotors and the center of the cylinder body are concentric, the assembly is more accurate, uneven stress during vertical installation of the bearing is avoided, vibration and noise during operation of the pump set are reduced, and the service life of the pump set is prolonged. When the front end needs to be turned over to assemble the other end after being assembled, the tool supports and protects the rotor, and prevents one end of the rotor from being suspended when the whole pump body rotates to a horizontal state, so that a bearing is damaged due to stress.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, in particular to an alignment tool for the assembly of a Roots vacuum pump rotor. Background Art

[0002] A Roots vacuum pump (abbreviation: Roots pump) refers to a variable-volume vacuum pump in which two leaf-shaped rotors that rotate synchronously in opposite directions are installed inside the pump, and there are small gaps between the rotors and between the rotors and the inner wall of the pump housing without contacting each other. In the pump cavity of an existing Roots pump, two "8"-shaped leaf-shaped rotors are installed perpendicular to each other on a pair of parallel shafts. The conventional assembly of a Roots vacuum pump adopts a horizontal assembly method. Due to gravity, the rotors will always be in an eccentric state. When installing the bearings, it is very difficult to install them because of the eccentricity and non-fixation of the rotors, and even the bearings may be damaged. For this reason, we propose an alignment tool for the assembly of a Roots vacuum pump rotor to solve the above problems. Content of the Utility Model

[0003] The purpose of the utility model is to solve the defect that in the prior art, when horizontally assembling, the rotors will always be in an eccentric state due to gravity, resulting in difficult installation of the bearings or even damage to the bearings, and to propose an alignment tool for the assembly of a Roots vacuum pump rotor.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] Design an alignment tool for the assembly of a Roots vacuum pump rotor, including a pair of connecting plates. The two ends of the pair of connecting plates are respectively fixedly connected with a bottom plate and a support plate through a fixed connection structure. A pair of rotor anti-rotation pins are fixedly arranged on the top of the bottom plate. A pin hole is opened on the top of the bottom plate, and a pin is inserted into the pin hole. A pair of assembly holes are vertically penetrated through the upper end surface of the bottom plate, and a guiding structure and a tight sleeve structure are respectively arranged at the upper and lower ends of the assembly holes. The top of the support plate is provided with two spring seats located directly below the pair of assembly holes through a connection structure. The tops of the pair of spring seats are respectively movably connected with an X-axis bracket and a Y-axis bracket through a limiting structure. Circular spring grooves are opened on the tops of the pair of spring seats, and springs are arranged in the spring grooves. The upper ends of the two springs respectively abut against the X-axis bracket and the Y-axis bracket.

[0006] Preferably, a chamfer is opened at the upper end of the rotor anti-rotation pin.

[0007] Preferably, the tight - fitting structure includes a fixing ring, a fastening screw, and a constriction groove. The bottom of the bottom plate is fixedly connected by screws to two fixing rings that are concentric with the two assembly holes respectively. The right end of the fixing ring is provided with a constriction groove that penetrates the right end of the fixing ring. A through - hole that penetrates the constriction groove is provided on the outer wall of the fixing ring, and a fastening screw is inserted into the through - hole. The front end and the rear end of the fastening screw with a nut are respectively slidably connected and threadedly connected to the front half and the rear half of the fixing ring on both sides of the constriction groove.

[0008] Preferably, the limiting structure includes a bottom hole, a limiting hole, and a limiting screw. A bottom hole is penetrated and opened at the top of the support plate. A limiting hole that is aligned with and has the same diameter as the bottom hole is opened at the bottom of the spring seat, and a limiting screw is slidably arranged in the limiting hole. The nut at the lower end of the limiting screw is slidably connected to the hole wall of the limiting hole. The upper end of the limiting screw penetrates and is slidably connected to the spring seat. The upper ends of the two limiting screws extend above the connecting spring seat and are respectively threadedly connected to the X - axis bracket and the Y - axis bracket.

[0009] Preferably, the connecting structure includes a circular ring and a screw. An integrally - formed circular ring with four through - holes opened on its upper end face is provided on the outer wall of the lower end of the spring seat, and a screw is inserted into the through - hole of the circular ring. The lower end of the screw is threadedly connected to the support plate, and the bottom of the nut at the upper end of the screw abuts against the circular ring.

[0010] Preferably, the guiding structure includes a guide sleeve. Two guiding holes that are concentric with and communicate with the assembly holes are opened at the top of the bottom plate, and a guide sleeve is fixedly arranged in the guiding hole. The top of the guide sleeve is provided with an inner chamfer that facilitates the insertion of the rotor.

[0011] Preferably, the fixed - connection structure includes an upper screw and a lower screw. Two pairs of stepped holes that are respectively aligned with the two connecting plates are opened on the end faces of the bottom plate and the support plate close to each other. An upper screw and a lower screw are respectively inserted into the upper stepped hole and the lower stepped hole, and the ends of the upper screw and the lower screw close to each other are respectively threadedly connected to the bottom and the top of the connecting plate.

[0012] The beneficial effects of a rotor assembly centering tool for a Roots vacuum pump proposed by the present utility model are as follows: The bottom support uses springs to ensure that the rotor and the bottom surface of the bearing end plate are in close contact and concentric, which is conducive to more precisely adjusting the working clearance of the rotor during the pump body assembly. The pin and the fixing ring ensure that the centers of the two rotors are concentric with the center of the cylinder block, and the assembly is more accurate, avoiding uneven stress when the bearing is vertically installed, reducing the vibration and noise during the operation of the pump set. When it is necessary to flip by ° after the front - end assembly to assemble the other end, the tool supports and protects the rotor and prevents one end of the rotor from being suspended when the entire pump body rotates to the horizontal state, thus preventing the bearing from being damaged due to stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1Schematic structural diagram of an alignment tooling for a Roots vacuum pump rotor assembly proposed by the present utility model;

[0014] Figure 2 Enlarged view of area A of an alignment tooling for a Roots vacuum pump rotor assembly proposed by the present utility model;

[0015] Figure 3 Enlarged view of area B of an alignment tooling for a Roots vacuum pump rotor assembly proposed by the present utility model;

[0016] Figure 4 Schematic bottom view of an alignment tooling for a Roots vacuum pump rotor assembly proposed by the present utility model;

[0017] Figure 5 Schematic top view of an alignment tooling for a Roots vacuum pump rotor assembly proposed by the present utility model.

[0018] In the figure: 1, support plate; 2, X-axis bracket; 3, connecting plate; 4, pin hole; 5, pin; 6, upper screw; 7, assembly hole; 8, fastening screw; 9, bottom plate; 0, fixing ring; 11, guide sleeve; 12, rotor anti-rotation pin; 13, lower screw; 14, screw; 15, spring seat; 16, spring; 17, spring groove; 18, limit screw; 19, bottom hole; 20, Y-axis bracket; 21, constriction groove. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0020] Refer to Figures 1-5 , an alignment tooling for a Roots vacuum pump rotor assembly, including a pair of connecting plates 3. The two ends of the pair of connecting plates 3 are respectively fixedly connected to a bottom plate 9 and a support plate 1 through a fixed connection structure. A pair of rotor anti-rotation pins 12 are fixedly arranged on the top of the bottom plate 9. A pin hole 4 is opened on the top of the bottom plate 9, and a pin 5 is inserted into the pin hole 4. A pair of assembly holes 7 are penetrated through the upper end surface of the bottom plate 9, and a guiding structure and a tight sleeve structure are respectively arranged at the upper and lower ends of the assembly hole 7. The top of the support plate 1 is provided with two spring seats 15 respectively located directly below the pair of assembly holes 7 through a connection structure. The tops of the pair of spring seats 15 are respectively movably connected to an X-axis bracket 2 and a Y-axis bracket 20 through a limit structure. Circular spring grooves 17 are opened on the tops of the pair of spring seats 15, and springs 16 are arranged in the spring grooves 17. The upper ends of the two springs 16 respectively abut against the X-axis bracket 2 and the Y-axis bracket 20.

[0021] The upper end of the rotor anti-rotation pin 12 is provided with a chamfer.

[0022] The tight - fitting structure includes a fixing ring 10, a fastening screw 8, and a constriction groove 21. The bottom of the bottom plate 9 is fixedly connected by screws to two fixing rings 10 that are concentric with the two assembly holes 7 respectively. A constriction groove 21 that penetrates the right end of the fixing ring 10 is provided at the right end of the fixing ring 10. A through - hole that penetrates the constriction groove 21 is provided on the outer wall of the fixing ring 10, and a fastening screw 8 is inserted into the through - hole. The front end and the rear end of the fastening screw 8 with a nut are slidably connected and threadedly connected to the front half and the rear half of the fixing ring 10 on the front and rear sides of the constriction groove 21 respectively.

[0023] The limiting structure includes a bottom hole 19, a limiting hole, and a limiting screw 18. A bottom hole 19 is provided through the top of the support plate 1. A limiting hole that is aligned with and has the same diameter as the bottom hole 19 is provided at the bottom of the spring seat 15, and a limiting screw 18 is slidably arranged in the limiting hole. The nut at the lower end of the limiting screw 18 is slidably connected to the hole wall of the limiting hole, and the upper end of the limiting screw 18 penetrates and is slidably connected to the spring seat 15. The upper ends of the two limiting screws 18 extend above the spring seat 15 and are respectively threadedly connected to the X - axis bracket 2 and the Y - axis bracket 20.

[0024] The connecting structure includes a circular ring and a screw 14. A circular ring with four through - holes provided on its upper end face is integrally formed on the lower outer wall of the spring seat 15, and a screw 14 is inserted into the through - holes of the circular ring. The lower end of the screw 14 is threadedly connected to the support plate 1, and the bottom of the nut at the upper end of the screw 14 abuts against the circular ring.

[0025] The guiding structure includes a guide sleeve 11. Two guiding holes that are concentric with and communicate with the assembly holes 7 are provided on the top of the bottom plate 9, and a guide sleeve 11 is fixedly arranged in the guiding holes. An internal chamfer that facilitates the insertion of the rotor is provided at the top of the guide sleeve 11.

[0026] The fixed - connection structure includes an upper screw 6 and a lower screw 13. Two pairs of stepped holes that are aligned with the two connecting plates 3 respectively are provided on the end faces of the bottom plate 9 and the support plate 1 that are close to each other. The upper screw 6 and the lower screw 13 are respectively inserted into the upper stepped hole and the lower stepped hole, and the ends of the upper screw 6 and the lower screw 13 that are close to each other are respectively threadedly connected to the bottom and the top of the connecting plate 3.

[0027] Working principle: When assembling the Roots vacuum pump, the cylinder block is installed on the flipping tooling, and then the centering tooling is hoisted to one end of the cylinder block and fixed tightly with screws. Then, the cylinder block is flipped 180° through the flipping tooling to complete the entire assembly process in the vertical direction. Then, the rotor is hoisted into the cylinder block by a hoisting device. After the bottom of the rotor passes through the central hole of the base, it is slowly inserted into the two assembly holes 7 on the bottom plate 9 and abuts against the X-axis bracket 2 and the Y-axis bracket 20. After the two rotors are correctly placed, use a wrench to tighten the fastening screws 8 on the fixing ring 10. The right ends of the front and rear halves of the fixing ring 10 are close to each other, causing the constriction groove 21 to shrink and the fixing ring 10 to shrink and tightly fit on the two rotors to fix the two rotors. Then, the subsequent assembly is carried out. After the upper end assembly is completed, the cylinder block is flipped 180° through the flipping tooling, the centering tooling is removed, and the subsequent assembly of the other end is carried out. The fixing ring 10 can ensure that the two rotors always maintain a vertically centered state after being hoisted into the cylinder block, providing guarantee for the subsequent assembly of rotating parts such as shaft seals, shaft sleeves, and bearings. At the same time, the bottom spring 16 of the tooling enables the X-axis bracket 2 and the Y-axis bracket 20 to support the rotor, ensuring that one end of the two rotors is closely attached to the bearing end plate, providing guarantee for the subsequent vacuum pump clearance inspection and precise adjustment of the working clearance.

[0028] The bottom support uses a spring 16 to ensure that the rotor and the bottom surface of the bearing end plate are in close contact and concentric, which is beneficial to more accurately adjusting the working clearance of the rotor during the pump body assembly. The pin 5 and the fixing ring 10 ensure that the centers of the two rotors are concentric with the center of the cylinder block, making the assembly more accurate, avoiding uneven stress when the bearing is vertically installed, and reducing the vibration and noise during the operation of the pump set. When it is necessary to flip 180° to assemble the other end after the front-end assembly, the tooling supports and protects the rotor and prevents one end of the rotor from hanging in the air when the entire pump body rotates to the horizontal state, thereby preventing the bearing from being damaged due to stress.

[0029] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A Roots vacuum pump rotor assembly and centering tool, comprising a pair of connecting plates (3), characterized in that: The two ends of the pair of connecting plates (3) are respectively fixedly connected to the bottom plate (9) and the support plate (1) through a fixed connection structure. A pair of rotor anti-rotation pins (12) are fixedly arranged on the top of the bottom plate (9). A pin hole (4) is provided on the top of the bottom plate (9), and a pin (5) is inserted into the pin hole (4). A pair of assembly holes (7) are penetrated through the upper end surface of the bottom plate (9), and the upper and lower ends of the assembly holes (7) are respectively provided with a guide structure and a tight sleeve structure. The top of the support plate (1) has two spring seats (15) located directly below the pair of assembly holes (7) through the connection structure. The top of the pair of spring seats (15) is movably connected to the X-axis bracket (2) and the Y-axis bracket (20) through a limiting structure. The top of the pair of spring seats (15) is provided with a circular spring groove (17), and a spring (16) is provided in the spring groove (17). The upper ends of the two springs (16) are respectively abutted against the X-axis bracket (2) and the Y-axis bracket (20).

2. A Roots vacuum pump rotor assembly and centering tool according to claim 1, characterized in that: The upper end of the rotor anti-rotation pin (12) is provided with a chamfer.

3. The Roots vacuum pump rotor assembly and centering tool according to claim 1, characterized in that: The tight sleeve structure comprises a fixing ring (10), a fastening screw (8) and a tightening groove (21); the bottom of the base plate (9) is fastened with two fixing rings (10) respectively concentric with the two assembly holes (7) by screws; the right end of the fixing ring (10) is provided with a tightening groove (21) penetrating the right end of the fixing ring (10); the outer wall of the fixing ring (10) is provided with a through hole penetrating the tightening groove (21), and the fastening screw (8) is inserted into the through hole; the front end and the rear end of the fastening screw (8) having a nut are respectively slidably connected and threadedly connected to the front half and the rear half of the fixing ring (10) located on the front and rear sides of the tightening groove (21).

4. The Roots vacuum pump rotor assembly and centering tool according to claim 1, characterized in that: The limiting structure comprises a bottom hole (19), a limiting hole, and a limiting screw (18); the top of the support plate (1) is penetrated with a bottom hole (19); the bottom of the spring seat (15) is penetrated with a limiting hole aligned with and directly identical to the bottom hole (19); and a limiting screw (18) is slidably arranged in the limiting hole; a nut at the lower end of the limiting screw (18) is slidably connected to the hole wall of the limiting hole; the upper end of the limiting screw (18) penetrates and is slidably connected to the spring seat (15); the upper ends of the two limiting screws (18) extend to the top of the spring seat (15) and are respectively threadedly connected to the X-axis bracket (2) and the Y-axis bracket (20).

5. The Roots vacuum pump rotor assembly and centering tool according to claim 1, characterized in that: The connection structure comprises a circular ring and a screw (14); the outer wall of the lower end of the spring seat (15) is integrally formed with a circular ring with four through holes on the upper end surface, and the screw (14) is inserted into the through holes of the circular ring; the lower end of the screw (14) is threadedly connected to the support plate (1), and the bottom of the nut at the upper end of the screw (14) abuts against the circular ring.

6. The Roots vacuum pump rotor assembly and centering tool according to claim 1, characterized in that: The guide structure comprises a guide sleeve (11), the top of the bottom plate (9) is provided with two guide holes which are concentric with and connected to the assembly hole (7), and the guide sleeve (11) is fixed in the guide hole, and the top of the guide sleeve (11) is provided with an inner chamfer for facilitating the insertion of the rotor.

7. The Roots vacuum pump rotor assembly and centering tool according to claim 1, characterized in that: The fixed connection structure comprises an upper screw (6) and a lower screw (13); two pairs of stepped holes respectively aligned with the two connecting plates (3) are opened on the end surfaces of the bottom plate (9) and the support plate (1) close to each other, and the upper screw (6) and the lower screw (13) are respectively inserted into the upper stepped hole and the lower stepped hole; the ends of the upper screw (6) and the lower screw (13) close to each other are respectively threadedly connected to the bottom and the top of the connecting plate (3).

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