Pressure relief structure for roots vacuum pump

Abstract

The utility model discloses a pressure relief structure for roots vacuum pump belongs to roots vacuum pump technical field, it includes the communicating cylinder, the communicating cylinder top is fixed and has the pressure relief pipe, is established with a plurality of pressure relief holes on the pressure relief pipe, the communicating cylinder top fixedly connected with two support stand, and the sliding connection of two support stand has the lift adjusting plate. This pressure relief structure for roots vacuum pump, through setting seal cover body, return spring and pressure relief hole, when the gas pressure of roots vacuum pump main part is too big, and the gas pressure will open the seal cover body and make the seal cover body move upward, and the seal cover body will compress return spring, along with the seal cover body upward movement, will gradually leak the pressure relief hole, and this structure can be according to the size of gas pressure adaptively to the pressure relief speed and adjust, avoid appearing low gas pressure when excessive pressure relief, high gas pressure when pressure relief is insufficient problem, ensure the normal work of roots vacuum pump main part.

Description

Technical Field

[0001] This utility model belongs to the field of Roots vacuum pump technology, specifically a pressure relief structure for Roots vacuum pumps. Background Technology

[0002] A Roots vacuum pump is a positive displacement vacuum pump that achieves vacuum by using two figure-eight rotors rotating within the pump casing to create a periodically changing sealed volume chamber. It requires a pressure relief structure primarily to prevent excessive internal pressure from damaging components and overloading the motor. It also reduces internal pressure during startup to avoid excessive pressure differences affecting pumping efficiency, thus ensuring safe and efficient operation. However, existing Roots vacuum pumps with pressure relief structures suffer from limitations. Because the diameter of the relief pipe is fixed, the relief rate is also fixed, making it difficult to adaptively adjust according to gas pressure. This leads to excessive pressure relief (over-vacuum) at low pressures and insufficient pressure relief (over-pressure) at high pressures, affecting the normal operation of the Roots vacuum pump. Utility Model Content

[0003] To overcome the above-mentioned defects, this utility model provides a pressure relief structure for Roots vacuum pumps. It solves the problem that in the existing pressure relief structure for Roots vacuum pumps, the diameter of the pressure relief pipe is fixed, and the pressure relief speed is also fixed. It is difficult to adaptively adjust according to the gas pressure, which leads to excessive pressure relief (over-vacuum) at low gas pressure and insufficient pressure relief (over-pressure) at high gas pressure, affecting the normal operation of the Roots vacuum pump.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a pressure relief structure for a Roots vacuum pump, comprising a connecting cylinder, a pressure relief pipe fixedly connected to the top of the connecting cylinder, a plurality of pressure relief holes formed on the pressure relief pipe, two supporting columns fixedly connected to the top of the connecting cylinder, a lifting adjustment plate slidably connected to the two supporting columns, four movable guide rods slidably connected through the lifting adjustment plate, a return spring sleeved on the movable guide rods, a sealing cover fixedly connected to the bottom end of the four movable guide rods, the pressure relief pipe located inside the sealing cover, and a Roots vacuum pump body fixedly connected to one end of the connecting cylinder.

[0005] As a further embodiment of this utility model: one end of the reset spring is fixedly connected to the bottom of the lifting adjustment plate, and the other end of the reset spring is fixedly connected to the top of the sealing cover.

[0006] As a further embodiment of this utility model: two sleeves are fixedly connected to the bottom of the lifting adjustment plate, and a fastening screw is threadedly connected to one side of each sleeve.

[0007] As a further embodiment of this utility model: the supporting column is located inside the sleeve, and the top of the supporting column is fixedly connected to a second circular plate through the lifting adjustment plate.

[0008] As a further embodiment of this utility model: the top end of the movable guide rod is fixedly connected to a first circular plate, and the number of the first circular plates is four.

[0009] As a further embodiment of this utility model: a plastic sealing ring is fixedly connected to the inner wall of the sealing cover, and the pressure relief pipe is in contact with the plastic sealing ring.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This Roots vacuum pump uses a pressure relief structure. By setting up a sealing cover, a return spring, and a pressure relief hole, when the internal gas pressure of the Roots vacuum pump body is too high, the gas pressure will push the sealing cover open, causing the sealing cover to move upward. The sealing cover will compress the return spring. As the sealing cover moves upward, it will gradually leak out of the pressure relief hole. At this time, the gas will be discharged from the pressure relief hole, thus completing the pressure relief work. Higher gas pressure will push the sealing cover open to a higher height, allowing more pressure relief holes to be leaked, which can increase the pressure relief speed. Lower gas pressure will push the sealing cover open to a lower height, allowing fewer pressure relief holes to be leaked, which can reduce the pressure relief speed. This structure can adaptively adjust the pressure relief speed according to the gas pressure, avoiding the problem of excessive pressure relief at low gas pressure and insufficient pressure relief at high gas pressure, ensuring the normal operation of the Roots vacuum pump body. 2. This Roots vacuum pump uses a pressure relief structure. By setting up a lifting adjustment plate and fastening screws, when the height of the lifting adjustment plate needs to be adjusted, the fastening screws are loosened to release the plate from its fixed state. At this point, the lifting adjustment plate can move up and down along the length of the support column. When the lifting adjustment plate reaches the appropriate position, the fastening screws are tightened to fix the position of the lifting adjustment plate, thus completing the height adjustment. By adjusting the height of the lifting adjustment plate, the tension of the return spring can be adjusted, thereby facilitating the adjustment of the pressure relief threshold. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a structural schematic diagram of the cross-section of the communicating cylinder of this utility model; Figure 3 This utility model Figure 2 Enlarged structural diagram at point A; Figure 4 This is a structural schematic diagram of the cross-section of the sealing cover and the plastic sealing ring of this utility model; In the diagram: 1. Connecting cylinder; 2. Roots vacuum pump body; 3. Pressure relief pipe; 4. Support column; 5. Lifting adjustment plate; 6. Sealing cover; 7. Movable guide rod; 8. First circular plate; 9. Return spring; 10. Sleeve; 11. Fastening screw; 12. Second circular plate; 13. Pressure relief hole; 14. Plastic sealing ring. Detailed Implementation

[0012] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0013] like Figure 1-4 As shown, this utility model provides a technical solution: a pressure relief structure for a Roots vacuum pump, including a connecting cylinder 1, a pressure relief pipe 3 fixedly connected to the top of the connecting cylinder 1, a plurality of pressure relief holes 13 opened on the pressure relief pipe 3, and two support columns 4 fixedly connected to the top of the connecting cylinder 1. Because of the support columns 4, when the lifting adjustment plate 5 moves, the lifting adjustment plate 5 will slide on the support columns 4. The support columns 4 can play a role in limiting and guiding the lifting adjustment plate 5, thereby improving the stability and accuracy of the movement of the lifting adjustment plate 5. One end of the return spring 9 is fixedly connected to the bottom of the lifting adjustment plate 5, and the other end of the return spring 9 is fixedly connected to the top of the sealing cover 6.

[0014] A lifting adjustment plate 5 is slidably connected to two supporting columns 4. Four movable guide rods 7 are slidably connected through the lifting adjustment plate 5. A return spring 9 is sleeved on the movable guide rod 7. Because of the return spring 9, the return spring 9 can exert a downward force on the sealing cover 6, which can ensure the stability of the position of the sealing cover 6. The pressure relief pipe 3 is sealed by the sealing cover 6 and the plastic sealing ring 14, so that the pressure relief pipe 3 has good sealing performance under normal conditions. Two sleeves 10 are fixedly connected to the bottom of the lifting adjustment plate 5. A fastening screw 11 is threaded on one side of the sleeve 10. Because of the fastening screw 11, the lifting adjustment plate 5 is fixed by tightening the fastening screw 11, which can effectively improve the stability of the lifting adjustment plate 5 and ensure the normal operation of the lifting adjustment plate 5.

[0015] The bottom ends of the four movable guide rods 7 are fixedly connected to the sealing cover 6, the pressure relief pipe 3 is located inside the sealing cover 6, the support column 4 is located inside the sleeve 10, and the top of the support column 4 passes through the lifting adjustment plate 5 and is fixedly connected to the second circular plate 12.

[0016] One end of the connecting cylinder 1 is fixed and connected to the main body 2 of the Roots vacuum pump. The top end of the movable guide rod 7 is fixedly connected to a first circular plate 8. There are four first circular plates 8. The inner wall of the sealing cover 6 is fixedly connected to a plastic sealing ring 14. Because of the plastic sealing ring 14, the sealing performance between the sealing cover 6 and the pressure relief pipe 3 can be effectively improved, preventing gas from escaping from the gap between the sealing cover 6 and the pressure relief pipe 3. The pressure relief pipe 3 is in contact with the plastic sealing ring 14.

[0017] The working principle of this utility model is as follows: When the internal air pressure of the Roots vacuum pump body 2 is too high, the air pressure will push open the sealing cover 6, causing the sealing cover 6 to move upward. The sealing cover 6 will compress the return spring 9. As the sealing cover 6 moves upward, it will gradually leak out of the pressure relief hole 13. At this time, the gas will be discharged from the pressure relief hole 13, thus completing the pressure relief work. A larger air pressure will push the sealing cover 6 open to a higher height, thus allowing more pressure relief holes 13 to leak out, which can increase the pressure relief speed. A smaller air pressure will push the sealing cover 6 open to a lower height, thus allowing a smaller number of pressure relief holes 13 to leak out, which can reduce the pressure relief speed. When it is necessary to adjust the height of the lifting adjustment plate 5, loosen the fastening screw 11 to release the fixed state of the lifting adjustment plate 5. At this time, the lifting adjustment plate 5 can move up and down along the length of the support column 4. When the lifting adjustment plate 5 moves to the appropriate position, tighten the fastening screw 11 to fix the position of the lifting adjustment plate 5, thus completing the height adjustment work of the lifting adjustment plate 5.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A pressure relief structure for a Roots vacuum pump, comprising a communicating cylinder (1), characterized in that: The top of the connecting cylinder (1) is fixed and connected to a pressure relief pipe (3). Several pressure relief holes (13) are opened on the pressure relief pipe (3). Two support columns (4) are fixedly connected to the top of the connecting cylinder (1). A lifting adjustment plate (5) is slidably connected to the two support columns (4). Four movable guide rods (7) are slidably connected through the lifting adjustment plate (5). A reset spring (9) is sleeved on the movable guide rod (7). A sealing cover (6) is fixedly connected to the bottom of the four movable guide rods (7). The pressure relief pipe (3) is located inside the sealing cover (6). One end of the connecting cylinder (1) is fixed and connected to the main body (2) of the Roots vacuum pump.

2. The pressure relief structure for a Roots vacuum pump according to claim 1, characterized in that: One end of the reset spring (9) is fixedly connected to the bottom of the lifting adjustment plate (5), and the other end of the reset spring (9) is fixedly connected to the top of the sealing cover (6).

3. The pressure relief structure for a Roots vacuum pump according to claim 1, characterized in that: The bottom of the lifting adjustment plate (5) is fixedly connected to two sleeves (10), and a fastening screw (11) is threaded on one side of the sleeve (10).

4. The pressure relief structure for a Roots vacuum pump according to claim 3, characterized in that: The support column (4) is located inside the sleeve (10), and the top of the support column (4) is fixedly connected to the second circular plate (12) through the lifting adjustment plate (5).

5. The pressure relief structure for a Roots vacuum pump according to claim 1, characterized in that: The top end of the movable guide rod (7) is fixedly connected to a first circular plate (8), and there are four first circular plates (8).

6. The pressure relief structure for a Roots vacuum pump according to claim 1, characterized in that: A plastic sealing ring (14) is fixedly connected to the inner wall of the sealing cover (6), and the pressure relief pipe (3) is in contact with the plastic sealing ring (14).

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