Backflow prevention structure of vacuum pump

Abstract

The utility model discloses a vacuum pump anti-backflow structure which comprises a vacuum pump body, the side end of the vacuum pump body is communicated with an air outlet pipe, the side of the air outlet pipe is connected with an anti-backflow pipe through a connecting flange, a rotating rod is rotationally connected in the anti-backflow pipe through a bearing, a hand wheel is arranged at the top of the rotating rod, and a sleeve is arranged at the lower end of the hand wheel. A first spring is arranged in the sleeve, the other end of the first spring is connected with a limiting plate, the side end of the limiting plate is connected with an inserting rod, a driving bevel gear is fixedly connected to a port of the rotating rod, the side of the driving bevel gear is connected with a driven bevel gear in a meshed mode, and the side end of the driven bevel gear is connected with a screw rod. By the adoption of the technical scheme, the backflow prevention structure of the vacuum pump is manufactured, when the vacuum pump stops working, the sealing plug can rapidly block the through hole, airflow backflow is avoided, the rotating rod can be locked, and gas backflow caused by autorotation of the rotating rod is prevented.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, and in particular to a vacuum pump anti-backflow structure. Background Technology

[0002] A vacuum pump is a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to evacuate a container and create a vacuum. In simpler terms, a vacuum pump is a device that improves, generates, and maintains a vacuum in a closed space using various methods. Based on their working principle, vacuum pumps can be broadly classified into two types: gas trapping pumps and gas transfer pumps. They are widely used in industries such as metallurgy, chemicals, food processing, and electronic coating. When a vacuum pump stops operating, the gas inside the pipes can flow back into the pump, significantly increasing the load during restart and affecting its vacuuming performance. Common anti-backflow devices typically use a baffle at the outlet to block the through-hole. However, this method is slow to prevent backflow and cannot effectively seal the outlet. Furthermore, it is prone to backflow under different gas pressure conditions. Therefore, we propose a vacuum pump anti-backflow structure. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a vacuum pump anti-backflow structure to resolve the issues raised in the background section.

[0004] This utility model discloses a vacuum pump anti-backflow structure, comprising a vacuum pump body, an outlet pipe connected to the side of the vacuum pump body, an anti-backflow pipe connected to the side of the outlet pipe via a connecting flange, a rotating rod rotatably connected to the anti-backflow pipe via a bearing, a handwheel at the top of the rotating rod, a sleeve at the lower end of the handwheel, a first spring inside the sleeve, a limiting plate connected to the other end of the first spring, a plug rod connected to the side of the limiting plate, a driving bevel gear fixedly connected to the end of the rotating rod, a driven bevel gear meshing with the side of the driving bevel gear, a screw rod connected to the side of the driven bevel gear, a threaded sleeve connected to the screw rod, movable plates connected to both sides of the threaded sleeve, a telescopic rod connected to the side of the movable plates, a second spring sleeved on the outside of the telescopic rod, a sliding rod connected to the bottom of the telescopic rod, and a sealing plug on the side of the sliding rod.

[0005] In the above scheme, the upper end of the vacuum pump body is connected to the air inlet pipe.

[0006] In the above scheme, two sliding grooves are opened on the inner wall of the vacuum pump body, and sliders are fixed on both sides of the moving plate, with the two sliders slidably connected to the sliding grooves.

[0007] In the above scheme, a handle is fixedly provided on the outside of the insertion rod.

[0008] In the above scheme, an insertion hole is opened at the upper end of the anti-backflow pipe, and the insertion hole is slidably connected to the insertion rod.

[0009] In the above scheme, one end of the second spring is connected to the moving plate, and the other end of the second spring is connected to the sliding rod.

[0010] In the above scheme, a partition plate is fixedly provided on the inner wall of the anti-backflow pipe, and a through hole is opened on the partition plate. The through hole and the sealing plug are slidably connected.

[0011] The advantages and beneficial effects of this utility model are as follows: This utility model provides a vacuum pump anti-backflow structure. Through a moving plate, slider, telescopic rod, second spring, and sealing plug, the sealing plug can quickly block the through hole when the vacuum pump stops working, preventing gas backflow. Through a rotating rod, driving bevel gear, driven bevel gear, screw, and screw sleeve, the distance between the slider and the partition plate can be easily adjusted according to different gas environment pressures to ensure the blocking effect of the sealing plug and improve the anti-backflow effect. Through a handwheel, sleeve, first spring, limit plate, insertion rod, handle, and insertion hole, the rotating rod can be locked to prevent it from rotating and causing gas backflow. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the handwheel structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the internal structure of the sleeve of this utility model.

[0016] Figure 4 This is a schematic diagram of the internal structure of the anti-backflow pipe of this utility model.

[0017] In the diagram: 1. Vacuum pump body; 11. Inlet pipe; 12. Outlet pipe; 13. Connecting flange; 14. Anti-backflow pipe; 15. Slide groove; 16. Partition plate; 17. Through hole; 2. Handwheel; 21. Sleeve; 22. First spring; 23. Limiting plate; 24. Insert rod; 25. Handle; 26. Insertion hole; 3. Rotating rod; 31. Driving bevel gear; 32. Driven bevel gear; 33. Screw; 34. Screw sleeve; 35. Moving plate; 36. Slider; 4. Telescopic rod; 41. Second spring; 42. Slide rod; 43. Sealing plug. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0019] like Figure 1-4 As shown, this utility model is a vacuum pump anti-backflow structure, including a vacuum pump body 1. The side end of the vacuum pump body 1 is connected to an outlet pipe 12. The outlet pipe 12 is connected to an anti-backflow pipe 14 via a connecting flange 13. The anti-backflow pipe 14 is rotatably connected to a rotating rod 3 via a bearing. When it is necessary to disassemble the anti-backflow pipe 14, the anti-backflow pipe 14 can be disassembled by removing the connecting flange 13.

[0020] The rotating rod 3 is equipped with a handwheel 2 at its top and a sleeve 21 at its lower end. A first spring 22 is installed inside the sleeve 21, and the other end of the first spring 22 is connected to a limiting plate 23. A plug rod 24 is connected to the side end of the limiting plate 23. When adjusting the distance between the sliding rod 42 and the partition plate 16, the handwheel 2 is rotated to make the adjustment. After the handwheel 2 drives the rotating rod 3 to make the adjustment, a handle 25 is fixedly installed on the outside of the plug rod 24 to prevent the rotating rod 3 from rotating on its own. By pulling the handle 25 upward, the handle 25 drives the plug rod 24 to slide inside the sleeve 21, thereby causing the limiting plate 23 to squeeze the first spring 22. When the handwheel 2 is adjusted, the upper end of the anti-backflow tube 14 is provided with a socket 26. The socket 26 is slidably connected to the insertion rod 24. When the handle 25 is released, the first spring 22 needs to return to its original state. The first spring 22 pushes the limiting plate 23 to move downward, so that the insertion rod 24 is inserted into the socket 26, thereby locking the handwheel 2 and ensuring that the rotating rod 3 will not rotate after adjustment. During the use of the vacuum pump body 1, due to the high air pressure, the airflow can easily push the slide rod 42, causing the moving plate 35 to move, resulting in the sealing plug 43 and the through hole 17 sliding outward, the sealing performance deteriorates, and air backflow occurs.

[0021] The rotating rod 3 is fixedly connected to the port of the rotating rod 3. The rotating rod 31 is laterally meshed with the driven bevel gear 32. The driven bevel gear 32 is connected to the side end of the driven bevel gear 32. The screw 33 is threadedly connected to the threaded sleeve 34. The threaded sleeve 34 is connected to the two sides of the moving plate 35. Under different environments, the gas pressure inside the gas outlet pipe 12 is different. When it is necessary to adjust the distance between the sliding rod 42 and the partition plate 16, the rotating rod 3 is rotated. The rotation of the rotating rod 3 can drive the rotating rod 31 at the port to rotate. The rotation of the rotating rod 31 drives the driven bevel gear 32, which is meshed with the driven bevel gear 32, to rotate. The driven bevel gear 32 drives the screw 33 to rotate in the threaded sleeve 34. The rotation of the screw 33 can drive the threaded sleeve 34 to start moving left and right in the anti-backflow pipe 14. The movement of the threaded sleeve 34 drives the moving plate 35 to move, which in turn drives the sliding rod 42 to move. The distance between the sliding rod 42 and the partition plate 16 can be adjusted according to different gas pressure environments.

[0022] The movable plate 35 is connected to a telescopic rod 4 on its side. A second spring 41 is sleeved on the outside of the telescopic rod 4. A sliding rod 42 is connected to the bottom of the telescopic rod 4. A sealing plug 43 is provided on the side end of the sliding rod 42. A partition plate 16 is fixedly provided on the inner wall of the anti-backflow pipe 14. A through hole 17 is opened on the partition plate 16. The through hole 17 and the sealing plug 43 are slidably connected. The upper end of the vacuum pump body 1 is connected to the air inlet pipe 11. During the use of the vacuum pump body 1, the airflow of the vacuum pump body 1 is discharged from the air outlet pipe 12 and enters the anti-backflow pipe 14. When the airflow does not pass through the anti-backflow pipe 14, the second spring 41 drives the sliding rod 42 to adhere to one side of the partition plate 16. At this time, the sealing plug 43 seals and adheres to the through hole 17. Inside, the airflow enters the anti-backflow tube 14. The high-pressure airflow can push the sealing plug 43. The moving plate 35 is fixed at this time. One end of the second spring 41 is connected to the moving plate 35, and the other end of the second spring 41 is connected to the sliding rod 42. The sealing plug 43 begins to compress the second spring 41 and the telescopic rod 4. The airflow begins to flow in the anti-backflow tube 14. After the vacuum pump body 1 is turned off, the airflow in the anti-backflow tube 14 stops, and the airflow no longer pushes the sealing plug 43. The second spring 41 needs to be restored to its original position. The second spring 41 can push the sliding rod 42 to make the sealing plug 43 quickly engage in the through hole 17 to prevent external air backflow and ensure the vacuum pump body 1's vacuuming effect.

[0023] In the above scheme, two sliding grooves 15 are opened on the inner wall of the vacuum pump body 1, and sliders 36 are fixed on both sides of the moving plate 35. The two sliders 36 are slidably connected to the sliding grooves 15. Through the sliders 36 and the sliding grooves 15, the movement of the moving plate 35 can be guided, ensuring the smoothness of the movement of the moving plate 35.

[0024] Working principle:

[0025] In this type of vacuum pump anti-backflow structure, before using the vacuum pump body 1, when adjusting the distance of the moving plate 35 according to the gas pressure, rotating the rotating rod 3 drives the active bevel gear 31 at the port to rotate. The rotation of the active bevel gear 31 drives the driven bevel gear 32 connected to the side to rotate. The movement of the screw sleeve 34 drives the moving plate 35 to move, which in turn drives the sliding rod 42 on the side to move. According to different gas pressure environments, the distance between the sliding rod 42 and the partition plate 16 is adjusted. After adjustment, the handle 2 is released. 5. The first spring 22 needs to be restored to its original state. The first spring 22 pushes the limiting plate 23 to move downward, so that the insertion rod 24 is inserted into the insertion hole 26, thereby locking the handwheel 2 and ensuring that the rotating rod 3 will not rotate after adjustment. After the vacuum pump is used, the air flow in the anti-backflow tube 14 stops, and the airflow no longer pushes the sealing plug 43. The second spring 41 needs to be restored to its original state. The second spring 41 can push the slide rod 42, so that the sealing plug 43 is quickly locked in the through hole 17 to prevent external air backflow and ensure the vacuum pump body 1 has a vacuuming effect.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum pump anti-backflow structure, comprising a vacuum pump body (1), characterized in that, The vacuum pump body (1) is connected to the outlet pipe (12) on one side. The outlet pipe (12) is connected to the anti-backflow pipe (14) on the side via a connecting flange (13). The anti-backflow pipe (14) is connected to the rotating rod (3) via a bearing. The rotating rod (3) is equipped with a handwheel (2) at the top and a sleeve (21) at the lower end. The sleeve (21) is equipped with a first spring (22). The other end of the first spring (22) is connected to a limiting plate (23). The side end of the limiting plate (23) is connected to an insert rod (24). The rotating rod (3) A drive bevel gear (31) is fixedly connected at the port. The drive bevel gear (31) is meshed with a driven bevel gear (32) on the side. A screw (33) is connected to the side end of the driven bevel gear (32). A screw sleeve (34) is threadedly connected to the screw (33). A moving plate (35) is connected to both sides of the screw sleeve (34). A telescopic rod (4) is connected to the side of the moving plate (35). A second spring (41) is sleeved on the outside of the telescopic rod (4). A slide rod (42) is connected to the bottom of the telescopic rod (4). A sealing plug (43) is provided on the side end of the slide rod (42).

2. The vacuum pump anti-backflow structure according to claim 1, characterized in that, The upper end of the vacuum pump body (1) is connected to the air inlet pipe (11).

3. The vacuum pump anti-backflow structure according to claim 1, characterized in that, The vacuum pump body (1) has two grooves (15) on its inner wall. The movable plate (35) has sliders (36) fixed on both sides. The two sliders (36) are slidably connected to the grooves (15).

4. The vacuum pump anti-backflow structure according to claim 1, characterized in that, A handle (25) is fixedly provided on the outside of the insertion rod (24).

5. The anti-backflow structure for a vacuum pump according to claim 1, characterized in that, The anti-backflow pipe (14) has an insertion hole (26) at its upper end, and the insertion hole (26) is slidably connected to the insertion rod (24).

6. The anti-backflow structure for a vacuum pump according to claim 1, characterized in that, One end of the second spring (41) is connected to the movable plate (35), and the other end of the second spring (41) is connected to the slide rod (42).

7. The vacuum pump anti-backflow structure according to claim 1, characterized in that, The inner wall of the anti-backflow pipe (14) is fixedly provided with a partition plate (16), and a through hole (17) is opened on the partition plate (16). The through hole (17) and the sealing plug (43) are slidably connected.

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