A gas-cooled roots pump movable end mechanism

Abstract

The utility model provides a kind of air-cooled roots pump movable end mechanism, including end cover, there is screw hole at equal intervals on the outer edge of end cover, and the one end of end cover is connected with pump body by bolt, the other end of end cover is equipped with back cover by bolt, and the edge position of back cover close to the one end of end cover is equipped with flange edge.Compared with prior art, the utility model has the beneficial effects as follows: for the problems of traditional key connection easy to wear, interference fit easy to loosen, the application adopts strip-shaped clamping block and sinking groove, limiting groove cooperation, combined with the connection mode of gear ring, gear shell and flange bolt fastening, axial fixation of round nut and stop nut, compared with traditional connection mode, it can better ensure the synchronous rotation accuracy of rotating shaft, the precise cooperation of strip-shaped clamping block and rotating shaft sinking groove, gear shell limiting groove avoids relative sliding risk, even face frequent start-stop and load fluctuation, it can also ensure the synchronism of transmission assembly and rotating shaft, effectively prevent transmission error increase.

Description

Technical Field

[0001] This utility model relates to a movable end mechanism of an air-cooled Roots pump, belonging to the field of Roots pumps. Background Technology

[0002] In modern industrial production, Roots pumps, as a highly efficient vacuum generating device, are widely used in chemical, electronic, food packaging, vacuum metallurgy and other fields. Their performance directly affects the stability and efficiency of the entire production process. Air-cooled Roots pumps, with their advantages of compact structure, high pumping speed and fast start-up, have become one of the key devices in vacuum systems. The moving end mechanism, as the core component of the Roots pump, plays a decisive role in the overall performance of the pump.

[0003] The common connection methods between the traditional rotating shaft and transmission component in the existing air-cooled Roots pump moving end mechanism are key connection or interference fit. Key connection involves machining keyways on the rotating shaft and transmission component, and embedding the key in them to achieve power transmission. Interference fit utilizes the slight dimensional difference between the inner holes of the rotating shaft and transmission component to achieve a tight fit through pressure assembly. Under long-term use, key connections are prone to wear and deformation of the keyway, resulting in an increased clearance between the key and the keyway. This causes relative sliding between the transmission component and the rotating shaft, increasing transmission errors, reducing pumping efficiency, and generating significant noise. Interference fits are difficult to disassemble and reassemble, easily damaging the rotating shaft and transmission component, which is detrimental to equipment maintenance and repair. Therefore, it is necessary to design a new moving end mechanism for air-cooled Roots pumps. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a moving end mechanism for an air-cooled Roots pump to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a movable end mechanism for an air-cooled Roots pump, including an end cover with threaded holes spaced at equal intervals on the outer edge, which are connected to the pump body by bolts; The rear cover has a flange edge with equally spaced screw holes for connection to the end cover via bolts. It has a hollow design and its shape matches the end cover. The mounting platform is located in the center of the end cap near the rear cover. It is integrally molded with the end cap, and mounting grooves are provided on both sides inside the mounting platform. Two through slots are provided, which are opened on the end cap and their positions correspond one-to-one with the two mounting slots; The pivot has two shafts that pass through the through slot and the mounting slot and extend into the inside of the back cover; The transmission components are symmetrically arranged on the rotating shaft inside the rear cover; The water-cooling component is located at the bottom inside the back cover; Piston ring seat, located inside the mounting groove and fitted onto the rotating shaft, with at least two piston rings evenly spaced on its inner surface; The ball bearing is fitted onto the rotating shaft, with one end inserted into the mounting groove and the other end integrally connected to a flange plate, which is fixed to the mounting platform by bolts. The oil baffle is located between the ball bearing and the piston ring seat. Its inner diameter matches the outer diameter of the shaft, and both ends are fitted with sealing rings.

[0006] Furthermore, the end cap has an outwardly protruding flange at one edge near the rear cover, and the rear cover has a concave ring that matches the flange at one end near the end cap, with a sealing strip adhered to the inner wall of the concave ring.

[0007] Furthermore, a viewing window is provided at the center of the lower half of the rear cover away from the end cover, and a nameplate is provided on the rear cover above the viewing window. Heat dissipation fins are provided parallel to each other at equal intervals on both sides of the rear cover, including the viewing window and the nameplate.

[0008] Furthermore, an oil injection hole is provided at the center of the top of the rear cover, and an oil drain hole is provided at the center of the bottom of the rear cover. Both the oil injection hole and the oil drain hole are threaded with sealing plugs.

[0009] Furthermore, the rear cover has an outlet and an inlet on both sides of the bottom of the end away from the end cover, and the water cooling assembly includes two main pipes that are threaded to the outlet and the inlet respectively, and several heat exchange tubes. The heat exchange tubes are evenly distributed between the two main pipes, and the ends of the heat exchange tubes are threaded to the main pipes.

[0010] Furthermore, the transmission assembly includes an oil slinger, a gear ring, a gear housing, a round nut, and a backstop nut sequentially sleeved on the rotating shaft, and an upper retaining ring is sleeved on the rotating shaft between the oil slinger and the ball bearing. The end of the rotating shaft away from the mounting groove is provided with a threaded portion that is compatible with the round nut and the backstop nut, and the round nut abuts against the gear housing.

[0011] Furthermore, a recessed groove is provided at the top of the rotating shaft, and a strip-shaped locking block is inserted into the recessed groove. The top of the strip-shaped locking block protrudes upward from the recessed groove, and a locking groove with a shape that matches the protruding part of the strip-shaped locking block is provided on the inner side wall of the oil slinger.

[0012] Furthermore, the gear housing is a hollow frustum-shaped design, and the outer diameter of the end of the gear housing near the ball bearing is smaller. The gear rings on the two rotating shafts mesh with each other, and the inside of each gear ring is provided with a through groove that matches the shape of the gear housing. The inner sidewall of the gear housing is provided with a limiting groove that matches the shape of the protruding part of the strip-shaped locking block. A flange is welded to the end of the gear housing away from the ball bearing, and the flange is fixed to the gear ring by bolts.

[0013] The beneficial effects of this utility model are: 1. To address the issues of easy wear and loosening of traditional key connections and interference fits, this application adopts a connection method that combines a strip-shaped locking block with a recessed groove and a limiting groove, along with bolts for fastening the gear ring, gear housing, and flange. The axial fixation of the round nut and anti-reverse nut ensures better synchronous rotation accuracy of the shaft compared to traditional connection methods. The precise fit between the strip-shaped locking block and the recessed groove of the shaft and the limiting groove of the gear housing avoids the risk of relative slippage. Even with frequent start-stop and load fluctuations, the synchronization of the transmission components and the shaft can be guaranteed, effectively preventing the increase of transmission error, improving transmission accuracy, ensuring stable pumping efficiency, and significantly reducing operating noise.

[0014] 2. Traditional interference fits are difficult to disassemble and reassemble, and are prone to damaging components. In contrast, most components in this application are connected by bolts, such as the end cover and pump body, the flange plate and mounting platform, and the gear housing flange and gear ring. This modular design simplifies component disassembly and installation, greatly reduces maintenance difficulty, minimizes the risk of damage to the shaft and transmission components during maintenance, shortens equipment downtime, reduces maintenance costs, and effectively improves production efficiency.

[0015] 3. This application employs a multi-layered sealing structure design, such as the convex and concave rings of the end cap and rear cover combined with sealing strips, the piston rings inside the piston ring seat, and the combination of the oil baffle and sealing rings, to comprehensively prevent gas leakage and lubricating oil seepage. Even during transmission, the stability of the sealing structure is guaranteed, maintaining the pump's vacuum and the normal operation of the lubrication system, thus extending the equipment's service life. Attached Figure Description

[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the external structure of the movable end mechanism of an air-cooled Roots pump according to the present invention; Figure 2 This is a partial cross-sectional structural diagram of the movable end mechanism of an air-cooled Roots pump according to the present invention; Figure 3 This is a cross-sectional view of the rear cover structure of the movable end mechanism of an air-cooled Roots pump according to the present invention. Figure 4 This is a cross-sectional view of the end cover structure of the movable end mechanism of an air-cooled Roots pump according to the present invention. Figure 5 This is a schematic diagram of the transmission component assembly structure of the movable end mechanism of an air-cooled Roots pump according to the present invention. In the picture: 1. End cap; 101. Raised edge; 102. Through slot; 2. Rear cover; 201. Flange edge; 202. Recessed ring; 3. Oil injection hole; 4. Water outlet; 5. Water inlet; 6. Heat dissipation fins; 7. Viewing window; 8. Transmission components; 9. Mounting platform; 901. Mounting slot; 10. Water-cooled components; 1001. Main pipe; 1002. Heat exchanger tube; 11. Oil drain hole; 12. Piston ring seat; 1201. Piston ring; 13. Oil baffle plate; 14. Sealing ring; 15. Ball bearing; 1501. Flange plate; 16. Shaft; 1601. Sinking groove; 1602. Threaded section; 17. Retaining ring; 18. Bar-shaped card block; 19. Oil slinger; 1901. Card slot; 20. Gear ring; 2001. Through groove; 21. Gear housing; 2101. Flange; 2102. Limiting groove; 22. Round nut; 23. Anti-reverse nut. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1 to 5 This utility model provides a technical solution: a movable end mechanism for an air-cooled Roots pump, including an end cover 1, with screw holes at equal intervals on the outer edge of the end cover 1, and one end of the end cover 1 is connected to the pump body by bolts, and a rear cover 2 is installed on the other end of the end cover 1 by bolts, and a flange 201 is provided on the edge of the rear cover 2 near one end of the end cover 1, with screw holes at equal intervals on the flange 201, and the rear cover 2 is hollow, and the shape of the rear cover 2 matches that of the end cover 1; Mounting platform 9 is located at the center of end cap 1 near the rear cover 2. Mounting platform 9 and end cap 1 are integrally molded. Mounting slots 901 are provided on both sides inside mounting platform 9. Two through slots 102 are provided on end cap 1, and the positions of the two through slots 102 correspond one-to-one with the two mounting slots 901. A rotating shaft 16 passes through both through slots 102, and the rotating shaft 16 passes through the mounting slot 901 and extends into the interior of the rear cover 2. A transmission component 8 is symmetrically arranged on the two rotating shafts 16 inside the rear cover 2, and a water cooling component 10 is arranged at the bottom of the interior of the rear cover 2. The piston ring seat 12 is installed inside the mounting groove 901, and the piston ring seat 12 is sleeved on the rotating shaft 16. At least two piston rings 1201 are evenly spaced on the inner surface of the piston ring seat 12. A ball bearing 15 is fitted on the rotating shaft 16, and one end of the ball bearing 15 is inserted into the mounting groove 901. The other end of the ball bearing 15 is integrally connected to a flange plate 1501, and the flange plate 1501 is fixed to the mounting platform 9 by bolts. An oil baffle 13 is provided between the ball bearing 15 and the piston ring seat 12, and the inner diameter of the oil baffle 13 matches the outer diameter of the rotating shaft 16. Both ends of the oil baffle 13 are fitted with sealing rings 14. The end cover 1 and the pump body, the flange plate 1501 and the mounting platform 9, the gear housing 21 and the gear ring 20 are all bolted together. This modular design makes the disassembly and installation of components easy, greatly reduces the maintenance difficulty, and reduces the risk of damage to the rotating shaft 16 and the transmission assembly 8 during maintenance. The rotating shaft 16 passes through the through groove 102, the mounting groove 901 and extends to the rear cover 2. With the installation method of the ball bearing 15 and the flange plate 1501, it provides stable support for the rotating shaft 16. One end of the ball bearing 15 is inserted into the mounting groove 901, and the other end is fixed to the mounting platform 9 by bolts through the flange plate 1501. It can effectively bear the axial and radial loads of the rotating shaft 16. Compared with the traditional single-point or simple support structure, it can significantly reduce the shaking and offset of the rotating shaft 16 during operation. Please see Figure 2 and Figure 3 The end cap 1 has an outwardly protruding flange 101 at one edge near the rear cover 2, and the rear cover 2 has a concave ring 202 that matches the flange 101 at one end near the end cap 1. A sealing strip is bonded to the inner wall of the concave ring 202. The flange 101 of the end cap 1 and the concave ring 202 of the rear cover 2 form a tight fit. This concave-convex structure itself has a certain sealing effect and can effectively block the leakage path of gas and lubricating oil. The sealing strip bonded to the inner wall of the concave ring 202 further fills the tiny gaps, forming a reliable sealing barrier. Compared with the traditional flat bonding connection method, this design significantly improves the sealing effect.

[0019] Please see Figure 1A viewing window 7 is located at the center of the lower half of the rear cover 2, away from the end cover 1. A nameplate is mounted on the rear cover 2 above the viewing window 7. Heat dissipation fins 6 are evenly spaced and parallel on both sides of the rear cover 2, with the viewing window 7 positioned at the center of the lower half away from the end cover 1. This location allows for clear observation of the internal lubricating oil level, oil quality, and some operational status of the transmission components 8. The equally spaced and parallel heat dissipation fins 6 on both sides of the viewing window 7 and the nameplate significantly increase the heat dissipation surface area of ​​the rear cover 2. Compared to a traditional smooth-surfaced rear cover 2, the heat dissipation fins 6 can more effectively exchange heat with the air, accelerating heat dissipation.

[0020] Please see Figure 1 and Figure 3 An oil filling hole 3 is provided at the center of the top of the rear cover 2, and an oil drain hole 11 is provided at the center of the bottom of the rear cover 2. Both the oil filling hole 3 and the oil drain hole 11 are threaded with sealing plugs. The oil filling hole 3 at the center of the top of the rear cover 2 and the oil drain hole 11 at the center of the bottom form a standardized lubricating oil circulation management channel. Both the oil filling hole 3 and the oil drain hole 11 are threaded with sealing plugs. This design can form a tight sealing structure.

[0021] Please see Figure 1 and Figure 3 The rear cover 2 has an outlet 4 and an inlet 5 on both sides of the bottom of the end away from the end cover 1. The water cooling assembly 10 includes two main pipes 1001 that are threaded to the outlet 4 and the inlet 5 respectively, and several heat exchange tubes 1002. The heat exchange tubes 1002 are evenly distributed between the two main pipes 1001, and the ends of the heat exchange tubes 1002 are threaded to the main pipes 1001. The inlet 5 and outlet 4 on both sides of the bottom of the rear cover 2 away from the end cover 1 form a scientific water circulation cooling channel with the main pipes 1001 and the heat exchange tubes 1002 of the water cooling assembly 10. Cooling water flows into the main pipe 1001 from the inlet 5. After fully absorbing the heat generated by the operation of the transmission component 8 inside the rear cover 2 through the equally spaced heat exchange tubes 1002, it flows out from the outlet 4. Compared with the traditional single pipe or simple water cooling structure, the multiple heat exchange tubes 1002 greatly increase the heat exchange area, which can remove heat more quickly and efficiently, accurately control the equipment temperature, and avoid component wear and performance degradation caused by high temperature.

[0022] Please see Figure 4 and Figure 5The transmission assembly 8 includes an oil slinger 19, a gear ring 20, a gear housing 21, a round nut 22, and a retaining nut 23 sequentially mounted on a rotating shaft 16. An upper retaining ring 17 is fitted onto the rotating shaft 16 between the oil slinger 19 and the ball bearing 15. The end of the rotating shaft 16 furthest from the mounting groove 901 has a threaded portion 1602 adapted to the round nut 22 and the retaining nut 23, with the round nut 22 abutting against the gear housing 21. The meshing design of the gear ring 20 and the gear housing 21 in the transmission assembly 8, combined with the threaded portion 1602 of the rotating shaft 16 and the round nut 23, ensures optimal performance. The axial fixing method of the nut 22 and the anti-reverse nut 23 forms a reliable power transmission structure. The gear ring 20 and the gear housing 21 cooperate with each other to accurately transmit power and ensure that the two rotating shafts 16 rotate synchronously. Compared with the traditional transmission structure, it effectively reduces transmission error. The round nut 22 abuts against the gear housing 21, and together with the anti-reverse nut 23, it can prevent the transmission component 8 from axial displacement during high-speed operation. Even under the conditions of frequent start-up and shutdown of the equipment and load fluctuation, it can maintain a stable transmission state and ensure the long-term reliable operation of the pump body.

[0023] Please see Figure 3 and Figure 5 The top of the rotating shaft 16 is provided with a recessed groove 1601, and a strip-shaped locking block 18 is inserted into the recessed groove 1601. The top of the strip-shaped locking block 18 protrudes upward from the recessed groove 1601, and the inner side wall of the oil slinger 19 is provided with a locking groove 1901 whose shape matches the protruding part of the strip-shaped locking block 18. This connection method enables the oil slinger 19 to rotate synchronously and precisely with the rotating shaft 16, ensuring that the power of the rotating shaft 16 is transmitted to the oil slinger 19 with zero loss. When the rotating shaft 16 rotates, the oil slinger 19 can timely and stably use centrifugal force to throw out the lubricating oil, evenly covering key components such as the gear ring 20 and the ball bearing 15.

[0024] Please see Figure 1 and Figure 2 The gear housing 21 has a hollow frustum shape, and the outer diameter of the end of the gear housing 21 closest to the ball bearing 15 is smaller. The gear rings 20 on the two rotating shafts 16 mesh with each other, and each gear ring 20 has a through groove 2001 inside that matches the shape of the gear housing 21. The inner sidewall of the gear housing 21 has a limiting groove 2102 whose shape matches the protruding part of the strip-shaped locking block 18. A flange 2101 is welded to the end of the gear housing 21 away from the ball bearing 15. The flange 2101 is fixed to the gear ring 20 by bolts. The housing 21 adopts a hollow frustum-shaped design, and the outer diameter of the end near the ball bearing 15 is smaller. This shape optimizes the meshing space of the gear ring 20. When the gear rings 20 on the two rotating shafts 16 mesh with each other, the frustum-shaped gear housing 21 can make the force distribution of the gear ring 20 more uniform and reduce the stress concentration phenomenon during meshing. The limiting groove 2102 opened on the inner side wall of the gear housing 21 matches the protruding part of the strip-shaped locking block 18, providing a precise positioning reference for the installation of the gear housing 21 and the rotating shaft 16 during the assembly process.

[0025] Detailed implementation: When assembling the movable end mechanism of the air-cooled Roots pump, two rotating shafts 16 pass through the end cover 1 and the mounting platform 9, extending into the rear cover 2. The transmission component 8 is sleeved on the rotating shaft 16, and the gear ring 20 meshes with the gear housing 21. It is fixed by the round nut 22 and the anti-reverse nut 23 to realize power transmission to drive the air pumping. The oil slinger 19 cooperates with the rotating shaft 16 and the gear housing 21 through the strip-shaped locking block 18 and rotates with the rotating shaft 16 to realize oil slinging. With the assistance of the oil baffle 13 and the sealing rubber ring 14, the ball bearing 15 and other components are lubricated. The piston ring 1201, the raised edge 101 and the concave ring 202 in the piston ring seat 12 form multiple seals to prevent lubricating oil leakage. The water inlet 5, the water outlet 4 and the water cooling component 10 form a water cooling cycle. The cooling water carries away the heat. The heat dissipation fins 6 assist in cooling. The oil injection hole 3 and the oil drain hole 11 facilitate the replacement of lubricating oil. The sight glass window 7 facilitates the observation of the interior and ensures the stable operation of the equipment.

[0026] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A movable end mechanism for an air-cooled Roots pump, characterized in that, include: End cap (1) has screw holes at equal intervals on its outer edge, which are connected to the pump body by bolts; The rear cover (2) has a flange edge (201) on its edge. The flange edge (201) has screw holes at equal intervals. It is connected to the end cover (1) by bolts. It has a hollow design and its shape matches the end cover (1). The mounting platform (9) is located at the center of the end cap (1) near the rear cover (2), and is integrally formed with the end cap (1). Mounting grooves (901) are provided on both sides inside the mounting platform (9). Two through slots (102) are provided and are opened on the end cap (1), with their positions corresponding one-to-one with the two mounting slots (901); The rotating shaft (16) is provided with two shafts that pass through the through groove (102) and the mounting groove (901) and extend into the interior of the rear cover (2); The transmission assembly (8) is symmetrically arranged on the rotating shaft (16) inside the rear cover (2); A water-cooling component (10) is located at the bottom of the interior of the rear cover (2); Piston ring seat (12) is located inside the mounting groove (901) and sleeved on the rotating shaft (16). At least two piston rings (1201) are evenly spaced on the inner surface. A ball bearing (15) is fitted onto a rotating shaft (16), with one end inserted into a mounting groove (901) and the other end integrally connected to a flange plate (1501). The flange plate (1501) is fixed to the mounting platform (9) by bolts. The oil baffle (13) is located between the ball bearing (15) and the piston ring seat (12). Its inner diameter matches the outer diameter of the rotating shaft (16), and both ends are fitted with sealing rings (14).

2. The movable end mechanism of an air-cooled Roots pump according to claim 1, characterized in that: The end cap (1) has an outwardly protruding flange (101) at one end near the rear cover (2), and the rear cover (2) has a concave ring (202) that matches the flange (101) at one end near the end cap (1), and the inner wall of the concave ring (202) is bonded with a sealing strip.

3. The movable end mechanism of an air-cooled Roots pump according to claim 1, characterized in that: A viewing window (7) is provided at the center of the lower half of the rear cover (2) away from the end cover (1), and a nameplate platform is provided on the rear cover (2) above the viewing window (7). Heat dissipation fins (6) are provided at equal intervals on both sides of the rear cover (2) of the viewing window (7) and the nameplate platform.

4. The movable end mechanism of an air-cooled Roots pump according to claim 1, characterized in that: An oil injection hole (3) is provided at the center of the top of the rear cover (2), and an oil drain hole (11) is provided at the center of the bottom of the rear cover (2). Both the oil injection hole (3) and the oil drain hole (11) are threaded with sealing plugs.

5. The movable end mechanism of an air-cooled Roots pump according to claim 1, characterized in that: The rear cover (2) has an outlet (4) and an inlet (5) on both sides of the bottom of the end away from the end cover (1). The water cooling assembly (10) includes two main pipes (1001) that are threaded to the outlet (4) and the inlet (5) respectively, and several heat exchange tubes (1002). The heat exchange tubes (1002) are evenly distributed between the two main pipes (1001), and the ends of the heat exchange tubes (1002) are threaded to the main pipes (1001).

6. The movable end mechanism of an air-cooled Roots pump according to claim 1, characterized in that: The transmission assembly (8) includes an oil slinger (19), a gear ring (20), a gear housing (21), a round nut (22), and a backstop nut (23) sequentially fitted onto the rotating shaft (16). A retaining ring (17) is fitted onto the rotating shaft (16) between the oil slinger (19) and the ball bearing (15). The end of the rotating shaft (16) away from the mounting groove (901) is provided with a threaded portion (1602) that is compatible with the round nut (22) and the backstop nut (23), and the round nut (22) abuts against the gear housing (21).

7. The movable end mechanism of an air-cooled Roots pump according to claim 6, characterized in that: The top of the rotating shaft (16) is provided with a recessed groove (1601), and a strip-shaped locking block (18) is inserted into the recessed groove (1601). The top of the strip-shaped locking block (18) protrudes upward from the recessed groove (1601), and the inner side wall of the oil slinger (19) is provided with a locking groove (1901) whose shape matches the protruding part of the strip-shaped locking block (18).

8. The movable end mechanism of an air-cooled Roots pump according to claim 7, characterized in that: The toothed shell (21) is a hollow frustum design, and the outer diameter of the end of the toothed shell (21) near the ball bearing (15) is smaller. The toothed rings (20) on the two rotating shafts (16) mesh with each other, and the inside of the toothed rings (20) is provided with through grooves (2001) that match the shape of the toothed shell (21). The inner sidewall of the toothed shell (21) is provided with a limiting groove (2102) that matches the protruding part of the strip-shaped card block (18). The end of the toothed shell (21) away from the ball bearing (15) is welded with a flange (2101), and the flange (2101) is fixed to the toothed ring (20) by bolts.

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