A maintenance-friendly combined two-stage vacuum pump body

Abstract

The application relates to the technical field of two-stage vacuum pumps, in particular to an easy-to-maintain combined two-stage vacuum pump body which comprises a pump body frame assembly, a first-stage pump cavity module, a second-stage pump cavity module and a connecting module. The first-stage pump cavity module and the second-stage pump cavity module are quickly assembled through the connecting module, and a sliding guide mechanism is arranged in the pump body frame assembly, so that the modules can be conveniently disassembled and assembled. The connecting module comprises a butt joint plate, a locking device and a positioning pin, and the accurate butt joint is ensured. The sliding guide mechanism reduces friction through sliding rails and sliding blocks and limits the moving range. The application realizes modular design, significantly shortens the maintenance time, improves the operation efficiency, reduces the energy consumption, and solves the problems of complex pump body structure and inconvenient maintenance in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum pump technology, specifically an easy-to-maintain combined two-stage vacuum pump body. Background Technology

[0002] In the design and application of vacuum pumps, the maintainability and assembly efficiency of the pump body structure are key factors affecting the reliability of equipment operation. Currently, existing two-stage vacuum pumps on the market typically adopt an integrated design. While this can meet basic vacuum extraction requirements, the disassembly and replacement of internal components often requires significant time and manpower. Furthermore, in actual use, due to the complex pump body structure, damage to local parts may necessitate complete disassembly for repair or replacement, which increases maintenance costs and operational difficulty to some extent.

[0003] Therefore, we have made improvements and proposed an easy-to-maintain combined two-stage vacuum pump body. Utility Model Content

[0004] The purpose of this invention is to solve the problems of complex pump body structure, inconvenient maintenance, and the need for overall disassembly when some parts are damaged in current two-stage vacuum pumps.

[0005] To achieve the above-mentioned objectives and improve the aforementioned problems, this utility model provides an easy-to-maintain combined two-stage vacuum pump body, including a pump body frame assembly, a first-stage pump chamber module, a second-stage pump chamber module, and a connecting module. The pump body frame assembly is used to support and fix the first-stage pump chamber module and the second-stage pump chamber module. The first-stage pump chamber module and the second-stage pump chamber module can be quickly assembled and separated through the connecting module. The pump body frame assembly is provided with a sliding guide mechanism inside, which is used to guide the movement trajectory of the first-stage pump chamber module and the second-stage pump chamber module during installation or disassembly.

[0006] The first-stage pump chamber module includes a first-stage impeller assembly, a first-stage chamber housing, and a sealing end cap. The first-stage impeller assembly is mounted inside the first-stage chamber housing via bearings. The sealing end cap is fixed to one end of the first-stage chamber housing via a threaded connection. The other end of the first-stage chamber housing has a mating flange. An annular groove is formed on the outer side of the mating flange, and a sealing ring is embedded in the annular groove. The second-stage pump chamber module includes a second-stage impeller assembly, a second-stage chamber housing, and a transition interface. The second-stage impeller assembly is mounted inside the second-stage chamber housing via bearings. The transition interface is connected to one end of the second-stage chamber housing via a snap-fit ​​structure. A positioning pin hole is provided on the outer side of the transition interface. The positioning pin hole is used to cooperate with the connecting module to achieve precise positioning.

[0007] As a preferred technical solution of this application, the connecting module includes a docking plate, a locking device, and a positioning pin. The docking plate has docking surfaces on both sides corresponding to the first-stage pump chamber module and the second-stage pump chamber module, respectively. The docking surfaces have grooves that match the docking flange. The locking device includes a plurality of evenly distributed locking bolts. The locking bolts pass through the docking plate and are threadedly connected to the docking flange. The positioning pin is inserted into the positioning pin hole to achieve axial alignment between the first-stage pump chamber module and the second-stage pump chamber module.

[0008] As a preferred technical solution of this application, the sliding guide mechanism includes a slide rail and a slider. The slide rail is fixed to the inner wall of the pump body frame assembly. The slider is fixed to the outer side of the first-stage pump chamber module and the second-stage pump chamber module by screws. A ball bearing is provided between the slider and the slide rail. The ball bearing is used to reduce the friction of the slider on the slide rail. Stops are provided at both ends of the slide rail. The stops are used to limit the movement range of the slider.

[0009] As a preferred technical solution of this application, the pump body frame assembly includes a base, side plates, and a top plate. The two sides of the base are fixedly connected to the side plates by bolts, and the top plate is fixedly connected to the top of the side plates by bolts. A through hole is provided in the center of the top plate for installing a drive motor. The output shaft of the drive motor is connected to the first-stage impeller assembly through a coupling. The inner side of the side plates is provided with reinforcing ribs to improve the overall rigidity of the pump body frame assembly.

[0010] As a preferred technical solution of this application, both the first-stage impeller assembly and the second-stage impeller assembly include an impeller body, blades, and a bushing. The blades are fixed to the outside of the impeller body by welding, and the bushing is fixed to the center hole of the impeller body by key connection. The outside of the bushing is provided with a lubricating oil groove, which is used to store lubricant to reduce bearing wear.

[0011] As a preferred technical solution of this application, a sealing gasket is provided on the inner side of the sealing end cap. The sealing gasket is made of flexible material and has a thickness of 2mm to 3mm. The sealing gasket is used to enhance the sealing performance between the sealing end cap and the outer shell of the primary cavity.

[0012] As a preferred technical solution of this application, a filter screen is provided on the inner side of the transition interface. The filter screen is fixed to the inner wall of the transition interface by a slot. The pore size of the filter screen is 0.5mm to 1mm. The filter screen is used to intercept impurities entering the second-stage pump chamber module.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] Through the provided first-stage pump chamber module, second-stage pump chamber module, and connection module, a modular design of the double-stage vacuum pump body is achieved. Users can move the first-stage pump chamber module and the second-stage pump chamber module along the slide rail to the outside of the pump body frame assembly through the sliding guide mechanism, and then quickly disassemble the first-stage pump chamber module or the second-stage pump chamber module by unlocking the locking device, thus significantly shortening the maintenance time. At the same time, through the provided positioning pins and docking plates, the precise docking between the first-stage pump chamber module and the second-stage pump chamber module is ensured, avoiding the problem of seal failure caused by assembly errors. In addition, by optimizing the structural design of the first-stage impeller assembly and the second-stage impeller assembly, the operating efficiency of the pump body is improved, the energy consumption is reduced, and the problems of inconvenient maintenance and complex operation of the double-stage vacuum pump body in the prior art are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic diagram of the overall external structure of the present utility model.

[0016] Figure 2 FIG. is a schematic diagram of the internal structure of the present utility model.

[0017] Figure 3 FIG. is a partially enlarged schematic diagram of the sliding guide mechanism.

[0018] Figure 4 FIG. is an enlarged view of the first-stage pump chamber module.

[0019] Figure 5 FIG. is an enlarged view of the second-stage pump chamber module.

[0020] The reference numerals are as follows:

[0021] 1. Pump body frame assembly; 2. First-stage pump chamber module; 3. Second-stage pump chamber module; 4. Connection module; 5. Sliding guide mechanism; 6. First-stage impeller assembly; 7. Sealing end cover; 8. Docking flange; 9. Second-stage impeller assembly; 10. Transition interface; 11. Locking device; 12. Positioning pin; 13. Slide rail; 14. Slide block; 15. Ball; 16. Filter screen. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model provides an easily maintainable combined double-stage vacuum pump body, and its overall structure is as Figure 1As shown, the system includes a pump body frame assembly 1, a first-stage pump chamber module 2, a second-stage pump chamber module 3, and a connecting module 4. The pump body frame assembly 1 serves as the main load-bearing structure of the entire device, and is bolted to the base, side plates, and top plate to form a stable frame structure. The base is bolted to the side plates on both sides, and the top of the side plates is bolted to the top plate. A through hole is provided in the center of the top plate for mounting the drive motor. The output shaft of the drive motor is connected to the first-stage impeller assembly 6 via a coupling, thus providing power to the entire pump body.

[0023] The first-stage pump chamber module 2 and the second-stage pump chamber module 3 are respectively installed inside the pump body frame assembly 1 via the sliding guide mechanism 5. Their specific assembly relationship is as follows: Figure 2 As shown. The first-stage pump chamber module 2 includes a first-stage impeller assembly 6, a first-stage chamber housing, and a sealing end cap 7. The first-stage impeller assembly 6 is mounted inside the first-stage chamber housing via bearings, and the sealing end cap 7 is fixed to one end of the first-stage chamber housing via a threaded connection. The other end of the first-stage chamber housing has a mating flange 8, and an annular groove is formed on the outer side of the mating flange 8. A sealing ring is embedded in the annular groove to ensure the sealing performance between the first-stage pump chamber module 2 and the connecting module 4. The second-stage pump chamber module 3 includes a second-stage impeller assembly 9, a second-stage chamber housing, and a transition interface 10. The second-stage impeller assembly 9 is mounted inside the second-stage chamber housing via bearings, and the transition interface 10 is connected to one end of the second-stage chamber housing via a snap-fit ​​structure. The outer side of the transition interface 10 has a positioning pin hole for cooperating with the positioning pin 12 in the connecting module 4 to achieve precise positioning.

[0024] The specific structure of connection module 4 is as follows: Figure 2 As shown, the assembly includes a docking plate, a locking device 11, and a positioning pin 12. The docking plate has docking surfaces on both sides corresponding to the first-stage pump chamber module 2 and the second-stage pump chamber module 3, respectively. The docking surfaces have grooves that match the docking flange 8. The locking device 11 consists of multiple evenly distributed locking bolts that pass through the docking plate and are threadedly connected to the docking flange 8. The positioning pin 12 is inserted into the positioning pin hole to ensure axial alignment between the first-stage pump chamber module 2 and the second-stage pump chamber module 3. Through this structural design, rapid assembly and disassembly of the first-stage pump chamber module 2 and the second-stage pump chamber module 3 are achieved.

[0025] The specific structure of the sliding guide mechanism 5 is as follows: Figure 3As shown, the system includes a slide rail 13 and a slider 14. The slide rail 13 is fixed to the inner wall of the pump body frame assembly 1, and the slider 14 is fixed to the outer side of the first-stage pump chamber module 2 and the second-stage pump chamber module 3 by screws. A ball bearing 15 is provided between the slider 14 and the slide rail 13. The ball bearing 15 reduces the friction of the slider 14 on the slide rail 13, thereby improving the smoothness of sliding. Stops are provided at both ends of the slide rail 13 to limit the range of movement of the slider 14 and prevent the first-stage pump chamber module 2 and the second-stage pump chamber module 3 from disengaging from the slide rail 13 during sliding.

[0026] The specific structures of the first-stage impeller assembly 6 and the second-stage impeller assembly 9 are as follows: Figure 4 and Figure 5 As shown, each component includes an impeller body, blades, and a bushing. The blades are fixed to the outside of the impeller body by welding, and the bushing is fixed to the center hole of the impeller body by a key connection. A lubricating oil groove is provided on the outside of the bushing to store lubricant and reduce bearing wear. A sealing gasket is provided on the inside of the sealing end cover 7. The sealing gasket is made of flexible material with a thickness of 2mm to 3mm and is used to enhance the sealing performance between the sealing end cover 7 and the outer shell of the first-stage chamber. A filter screen 16 is provided on the inside of the transition interface 10. The filter screen 16 is fixed to the inner wall of the transition interface 10 by a slot. The filter screen 16 has a pore size of 0.5mm to 1mm and is used to intercept impurities entering the second-stage pump chamber module 3.

[0027] During actual operation, the drive motor rotates the first-stage impeller assembly 6 via a coupling. The first-stage impeller assembly 6 draws in gas from the inlet, compresses it, and then delivers it to the connecting module 4 through the mating flange 8. The positioning pin 12 in the connecting module 4 ensures precise alignment between the first-stage pump chamber module 2 and the second-stage pump chamber module 3, preventing sealing failure due to assembly errors. After passing through the connecting module 4, the gas enters the second-stage pump chamber module 3, where the second-stage impeller assembly 9 further compresses and discharges the gas. The filter screen 16 within the transition interface 10 effectively intercepts impurities in the gas, preventing them from entering the second-stage pump chamber module 3 and causing damage.

[0028] When maintenance is required on either the first-stage pump chamber module 2 or the second-stage pump chamber module 3, the operator first unlocks the locking device 11 to disconnect the connection between the two modules. Then, the first-stage pump chamber module 2 or the second-stage pump chamber module 3 is moved along the slide rail 13 to the outside of the pump body frame assembly 1 via the sliding guide mechanism 5. As the slider 14 slides on the slide rail 13, the ball bearings 15 reduce friction, making the module movement smoother. A stop restricts the range of movement of the slider 14, ensuring the module does not disengage from the slide rail 13. After maintenance, the first-stage pump chamber module 2 or the second-stage pump chamber module 3 is pushed back into the pump body frame assembly 1 and re-secured using the locking device 11. The positioning pins 12 ensure axial alignment between the modules.

[0029] Through the above structural design and operating principle, this utility model achieves a modular design for the two-stage vacuum pump body. Users can quickly disassemble and install the first-stage pump chamber module 2 or the second-stage pump chamber module 3 via the sliding guide mechanism 5, significantly shortening maintenance time. Simultaneously, the positioning pin 12 and docking plate ensure precise docking between the first-stage pump chamber module 2 and the second-stage pump chamber module 3, avoiding sealing failures caused by assembly errors. Furthermore, the optimized structural design of the first-stage impeller assembly 6 and the second-stage impeller assembly 9 improves the pump body's operating efficiency, reduces energy consumption, and solves the problems of inconvenient maintenance and complex operation of existing two-stage vacuum pump bodies.

[0030] To enable those skilled in the art to fully understand and implement this utility model, the specific implementation principle of this utility model is further explained below in conjunction with a specific application scenario.

[0031] In actual operation, when the two-stage vacuum pump requires maintenance, the operator must first unlock the locking device 11 in the connecting module 4. Specifically, by loosening multiple evenly distributed locking bolts, the fixed connection between the first-stage pump chamber module 2 and the second-stage pump chamber module 3 is released. At this time, the locating pin 12 disengages from the locating pin hole, ensuring that the axial constraint between the first-stage pump chamber module 2 and the second-stage pump chamber module 3 is completely released. This design, through the matching structure of the groove on the mating plate and the mating flange 8, combined with the embedded annular groove of the sealing ring, ensures that the sealing performance will not decrease due to friction or misalignment during disassembly.

[0032] Subsequently, the operator uses the sliding guide mechanism 5 to slide the first-stage pump chamber module 2 outward along the slide rail 13. The slider 14 is fixed to the outside of the first-stage pump chamber module 2 with screws and moves smoothly on the slide rail 13. The presence of the ball bearings 15 significantly reduces the friction between the slider 14 and the slide rail 13, making the module slide smoother and easier to control. The stops at both ends of the slide rail 13 effectively limit the range of movement of the slider 14, preventing the first-stage pump chamber module 2 from detaching from the pump body frame assembly 1 during sliding. This process requires no additional tools and can be completed manually, greatly improving maintenance efficiency.

[0033] Meanwhile, if the second-stage pump chamber module 3 needs to be inspected or replaced, it can be moved out along the slide rail 13 via the sliding guide mechanism 5. During this process, the filter screen 16 inside the transition interface 10 can intercept impurities in the gas, preventing them from entering the secondary chamber housing and causing damage. The filter screen 16 is fixed to the inner wall of the transition interface 10 by a slot, making it easy to disassemble, clean, or replace, thereby further simplifying the maintenance process.

[0034] After maintenance is completed on either the first-stage pump chamber module 2 or the second-stage pump chamber module 3, the operator pushes it back into the pump body frame assembly 1. During this process, the slider 14 slides along the slide rail 13 again until the mating flange 8 of the first-stage pump chamber module 2 is fully engaged with the mating surface of the connecting module 4. At this point, the positioning pin 12 is reinserted to ensure axial alignment between the first-stage pump chamber module 2 and the second-stage pump chamber module 3, and the locking bolts of the locking device 11 securely connect the mating plate to the mating flange 8. This design not only enables rapid assembly but also effectively avoids sealing failures caused by assembly errors through the cooperation of the positioning pin 12 and the sealing ring.

[0035] Before restarting the equipment, the operating status of the primary impeller assembly 6 and the secondary impeller assembly 9 must be verified. The primary impeller assembly 6 is mounted inside the primary chamber housing via bearings. Lubricating oil grooves on the outer side of its bushing store lubricant, reducing bearing wear and extending its service life. The secondary impeller assembly 9 also uses bearing mounting and is tightly connected to the secondary chamber housing via a snap-fit ​​structure at the transition interface 10. This structural design optimizes gas compression efficiency while reducing energy consumption.

[0036] The drive motor rotates the first-stage impeller assembly 6 via a coupling, drawing in gas and conveying it to the connecting module 4 via the mating flange 8. After passing through the connecting module 4, the gas enters the second-stage pump chamber module 3, where it is further compressed by the second-stage impeller assembly 9 and then discharged. Throughout the process, the sealing gasket inside the sealing end cover 7 enhances the sealing performance. Its thickness is 2mm to 3mm, and it is made of flexible material, which can adapt to certain deformation requirements while maintaining a stable sealing effect.

[0037] Through the above steps and principle design, this utility model achieves modular maintenance of the two-stage vacuum pump body. Users can quickly disassemble and install the first-stage pump chamber module 2 or the second-stage pump chamber module 3, significantly shortening maintenance time. Simultaneously, the design of the positioning pin 12 and the docking plate ensures precise docking between modules, avoiding sealing failure due to assembly errors. Furthermore, the optimized structure of the first-stage impeller assembly 6 and the second-stage impeller assembly 9 improves the pump body's operating efficiency, solving the problems of inconvenient maintenance and complex operation of existing two-stage vacuum pump bodies.

Claims

1. A maintenance-friendly combined two-stage vacuum pump body, characterized in that, The pump body frame assembly (1), the first-stage pump chamber module (2), the second-stage pump chamber module (3), and the connecting module (4) are included. The pump body frame assembly (1) is used to support and fix the first-stage pump chamber module (2) and the second-stage pump chamber module (3). The first-stage pump chamber module (2) and the second-stage pump chamber module (3) are assembled and separated through the connecting module (4). The pump body frame assembly (1) is provided with a sliding guide mechanism (5) inside. The sliding guide mechanism (5) is used to guide the movement trajectory of the first-stage pump chamber module (2) and the second-stage pump chamber module (3) during the installation or disassembly process.

2. The easily maintainable combined two-stage vacuum pump body according to claim 1, characterized in that, The first-stage pump chamber module (2) includes a first-stage impeller assembly (6), a first-stage chamber shell, and a sealing end cap (7). The first-stage impeller assembly (6) is installed inside the first-stage chamber shell by bearings. The sealing end cap (7) is fixed to one end of the first-stage chamber shell by threaded connection. The other end of the first-stage chamber shell is provided with a mating flange (8). An annular groove is provided on the outer side of the mating flange (8), and a sealing ring is embedded in the annular groove.

3. The easily maintainable combined two-stage vacuum pump body according to claim 1, characterized in that, The second-stage pump chamber module (3) includes a second-stage impeller assembly (9), a second-stage chamber housing, and a transition interface (10). The second-stage impeller assembly (9) is installed inside the second-stage chamber housing by bearings. The transition interface (10) is connected to one end of the second-stage chamber housing by a snap-fit ​​structure. The outer side of the transition interface (10) is provided with a positioning pin hole, which is used to cooperate with the connecting module (4) to achieve positioning.

4. The easily maintainable combined two-stage vacuum pump body according to claim 1, characterized in that, The connecting module (4) includes a docking plate, a locking device (11), and a positioning pin (12). The docking plate has docking surfaces on both sides corresponding to the first-stage pump chamber module (2) and the second-stage pump chamber module (3). The docking surfaces have grooves that match the docking flange (8). The locking device (11) includes multiple evenly distributed locking bolts. The locking bolts pass through the docking plate and are threadedly connected to the docking flange (8). The positioning pin (12) is inserted into the positioning pin hole to achieve axial alignment between the first-stage pump chamber module (2) and the second-stage pump chamber module (3).

5. The easily maintainable combined two-stage vacuum pump body according to claim 1, characterized in that, The sliding guide mechanism (5) includes a slide rail (13) and a slider (14). The slide rail (13) is fixed on the inner wall of the pump body frame assembly (1). The slider (14) is fixed to the outside of the first-stage pump chamber module (2) and the second-stage pump chamber module (3) by screws. A ball bearing (15) is provided between the slider (14) and the slide rail (13). Stops are provided at both ends of the slide rail (13).

6. The easily maintainable combined two-stage vacuum pump body according to claim 1, characterized in that, The pump frame assembly (1) includes a base, side plates and a top plate. The two sides of the base are fixedly connected to the side plates by bolts, and the top plate is fixedly connected to the top of the side plates by bolts. A through hole is opened in the center of the top plate for installing a drive motor. The inner side of the side plates is provided with reinforcing ribs.

7. The easily maintainable combined two-stage vacuum pump body according to claim 2, characterized in that, The first-stage impeller assembly (6) and the second-stage impeller assembly (9) both include an impeller body, blades and a bushing. The blades are fixed to the outside of the impeller body by welding, and the bushing is fixed to the center hole of the impeller body by key connection. The outside of the bushing is provided with a lubricating oil groove.

8. The easily maintainable combined two-stage vacuum pump body according to claim 3, characterized in that, The inner side of the transition interface (10) is provided with a filter screen (16), which is fixed to the inner wall of the transition interface (10) by a slot. The aperture of the filter screen (16) is 0.5 mm to 1 mm.

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