Split diffuser for magnetic suspension turbine vacuum pump

Abstract

The utility model belongs to the field of diffuser structures, and particularly relates to a split diffuser for a magnetic suspension turbine vacuum pump, which comprises a front diffuser and a rear diffuser, and a connecting flange plate is integrally connected to the outer side wall of one end, close to the rear diffuser, of the front diffuser. A plurality of connecting flange holes are formed in the connecting flange plate in the circumferential direction in a penetrating mode, a plurality of connecting screw holes are evenly distributed in the end, close to the front-section diffuser, of the rear-section diffuser in the circumferential direction, the connecting flange holes correspond to the connecting screw holes in a one-to-one mode, and the connecting flange holes are connected with the connecting screw holes through fastening bolts. A connecting groove is formed in the end, close to the front-section diffuser, of the rear-section diffuser, and the end, close to the rear-section diffuser, of the front-section diffuser is matched with the connecting groove. The diffuser is of a two-section type design and is fixedly connected through the bolts, so that only the front section needs to be detached during cleaning, the detaching difficulty is reduced, scale layers on the inner surfaces of the impeller and the diffuser are convenient to clean, and meanwhile the machining difficulty is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of diffuser structures, and in particular relates to a split diffuser used for a magnetic suspension turbine vacuum pump. Background Art

[0002] The vacuum pump diffuser uses the principle that air flow velocity is inversely proportional to pressure. It works with a high-speed rotating impeller to do work on the gas, accelerate the outflow of gas and form a negative pressure structure. It is an important auxiliary device of the vacuum pump.

[0003] At present, magnetic levitation turbine vacuum pumps are mostly used in papermaking, chemical industry and other fields. Their main function is vacuum dehydration. Affected by the operating conditions, as the running time goes by, the inner surface of the vacuum pump pump port diffuser is prone to scaling. Therefore, the machine needs to be stopped every time it runs for a period of time to clean the vacuum pump pump port diffuser and impeller and remove the surface scaling.

[0004] However, the diffuser structure commonly used now is completed by integral processing. When cleaning, the diffuser needs to be disassembled as a whole for flushing. The diffuser is large in size and heavy in weight, making it difficult to disassemble. Utility Model Content

[0005] The utility model provides a split diffuser for a magnetic levitation turbine vacuum pump. The diffuser is designed in two sections and is fixed by bolts. Therefore, when cleaning, only the front section needs to be disassembled, which reduces the difficulty of disassembly, facilitates cleaning of scale layers on the inner surfaces of the impeller and the diffuser, and reduces the difficulty of processing.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A split diffuser for a magnetic levitation turbine vacuum pump comprises a front diffuser and a rear diffuser, wherein a connecting flange is integrally connected to the outer side wall of one end of the front diffuser close to the rear diffuser, and a plurality of connecting flange holes are provided on the connecting flange along its circumference, and a plurality of connecting screw holes are evenly distributed along its circumference at the end of the rear diffuser close to the front diffuser, and the connecting flange holes correspond to the connecting screw holes one by one, and the connecting flange holes and the connecting screw holes are connected by fastening bolts, a connecting groove is provided at the end of the rear diffuser close to the front diffuser, and the end of the front diffuser close to the rear diffuser is adapted to the connecting groove, a front flow cavity and a front flow cavity are respectively provided in the front diffuser and the rear diffuser, and the front flow cavity and the rear flow cavity are connected to form a flow cavity with a Venturi structure.

[0008] The following is a further optimization of the above technical solution by the present invention:

[0009] An annular clamp groove is provided on the outer side wall of one end of the front diffuser away from the rear diffuser.

[0010] Further optimization: a mounting flange is integrally connected to the outer side wall of the rear diffuser body, and a plurality of mounting flange holes are opened on the mounting flange along its circumference.

[0011] Further optimization: the circulation cavity includes a first air inlet section, a second air inlet section, a third air inlet section, and an air outlet section which are connected in sequence.

[0012] Further optimization: the inner diameter of the first air inlet section remains unchanged, the inner diameter of the second air inlet section gradually decreases along the gas flow direction, the inner diameter of the third air inlet section remains unchanged, and the inner diameter of the air outlet section gradually increases along the gas flow direction.

[0013] Further optimization: the inner wall curved surface of the rear section circulation cavity matches the impeller curved surface of the vacuum pump.

[0014] The utility model adopts a split design, which divides the diffuser into a front diffuser and a rear diffuser. Therefore, when cleaning the diffuser, only the front diffuser needs to be disassembled without the need for overall disassembly, which reduces the difficulty of disassembly and makes it more convenient to clean the scale layer on the inner surface of the impeller and the diffuser, while reducing the processing difficulty.

[0015] The utility model realizes the reliable connection between the front diffuser and the rear diffuser through the cooperation of the connecting flange, the connecting flange hole, the connecting screw hole and the fastening bolt. The connection method is simple and firm, ensuring the stability of the diffuser during operation.

[0016] The utility model further enhances the sealing performance of the connection by adapting the connecting groove at the end of the rear diffuser to the end of the front diffuser, reduces the risk of gas leakage, and improves the working efficiency of the magnetic levitation turbine vacuum pump.

[0017] The utility model forms a flow cavity of a Venturi structure by connecting the front flow cavity and the rear flow cavity. This structure can utilize the principles of fluid mechanics to not only accelerate the flow of gas in the flow cavity, but also increase the flow rate and flow of the gas, thereby improving the suction capacity and efficiency of the magnetic levitation turbine vacuum pump; and the Venturi structure can also reduce energy loss during the gas flow process and reduce the energy consumption of the vacuum pump.

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of the present utility model;

[0021] Figure 3This is a cross-sectional view of the front diffuser of an embodiment of the present utility model;

[0022] Figure 4 This is a cross-sectional view of the rear diffuser of an embodiment of the present invention.

[0023] In the figure: 1-front diffuser; 2-rear diffuser; 3-connecting flange; 4-connecting flange hole; 5-connecting screw hole; 6-fastening bolt; 7-connecting groove; 8-circulation cavity; 81-first air inlet section; 82-second air inlet section; 83-third air inlet section; 84-air outlet section; 9-front circulation cavity; 10-rear circulation cavity; 11-clamp groove; 12-mounting flange; 13-mounting flange hole. DETAILED DESCRIPTION

[0024] like Figure 1-4 As shown, a split diffuser for a magnetic levitation turbine vacuum pump includes a front diffuser 1 and a rear diffuser 2. A connecting flange 3 is integrally connected to the outer side wall of one end of the front diffuser 1 close to the rear diffuser 2, and a plurality of connecting flange holes 4 are opened on the connecting flange 3 along its circumference. A plurality of connecting screw holes 5 are evenly distributed along its circumference at the end of the rear diffuser 2 close to the front diffuser 1, and the connecting flange holes 4 correspond to the connecting screw holes 5 one by one. The connecting flange holes 4 and the connecting screw holes 5 are connected by fastening bolts 6. A connecting groove 7 is opened at the end of the rear diffuser 2 close to the front diffuser 1, and the end of the front diffuser 1 close to the rear diffuser 2 is adapted to the connecting groove 7. A front flow cavity 9 and a rear flow cavity 10 are respectively opened in the front diffuser 1 and the rear diffuser 2, and the front flow cavity 9 and the rear flow cavity 10 are connected to form a flow cavity 8 with a Venturi structure.

[0025] With this design, first, a split design is adopted to divide the diffuser into a front diffuser 1 and a rear diffuser 2. Therefore, when cleaning the diffuser, only the front diffuser 1 needs to be disassembled without the need for overall disassembly, which reduces the difficulty of disassembly and makes it more convenient to clean the scale layer on the inner surface of the impeller and the diffuser, while reducing the difficulty of processing.

[0026] Secondly, by cooperating with the connecting flange 3, the connecting flange hole 4, the connecting screw hole 5 and the fastening bolt 6, a reliable connection between the front diffuser 1 and the rear diffuser 2 is achieved. The connection method is simple and firm, ensuring the stability of the diffuser during operation.

[0027] Again, the connection groove 7 at the end of the rear diffuser 2 is adapted to the end of the front diffuser 1, further enhancing the sealing of the connection, reducing the risk of gas leakage, and improving the working efficiency of the magnetic levitation turbine vacuum pump.

[0028] Finally, the front section flow chamber 9 and the rear section flow chamber 10 are connected to form a flow chamber 8 with a Venturi structure. This structure can utilize the principles of fluid mechanics to not only accelerate the flow of gas in the flow chamber 8, but also increase the flow rate and flow of the gas, thereby improving the pumping capacity and efficiency of the magnetic levitation turbine vacuum pump; and the Venturi structure can also reduce the energy loss during the gas flow process and reduce the energy consumption of the vacuum pump.

[0029] An annular clamp groove 11 is provided on the outer side wall of one end of the front diffuser 1 away from the rear diffuser 2 .

[0030] With this design, the clamp groove 11 on the outer wall of the front diffuser 1 can be used to install clamps and other fixing devices, which not only facilitates connection with other pipelines, but also can be quickly fixed with clamps according to different working conditions to improve installation efficiency. In addition, the clamp connection has good sealing and stability, which can effectively prevent gas leakage and ensure the normal operation of the magnetic levitation turbine vacuum pump.

[0031] A mounting flange 12 is integrally connected to the outer side wall of the rear diffuser 2 body, and a plurality of mounting flange holes 13 are formed on the mounting flange 12 along its circumference.

[0032] With this design, the mounting flange 12 and the mounting flange hole 13 on the outer side wall of the rear diffuser 2 facilitate installation of the entire diffuser on the magnetic levitation turbine vacuum pump, making the installation operation more convenient and quick.

[0033] The flow cavity 8 includes a first air inlet section 81 , a second air inlet section 82 , a third air inlet section 83 , and an air outlet section 84 which are connected in sequence.

[0034] The inner diameter of the first air inlet section 81 remains unchanged, the inner diameter of the second air inlet section 82 gradually decreases along the gas flow direction, the inner diameter of the third air inlet section 83 remains unchanged, and the inner diameter of the air outlet section 84 gradually increases along the gas flow direction.

[0035] With this design, firstly, the inner diameter of the first air inlet section 81 remains unchanged, which can ensure that the gas maintains a stable flow rate and pressure in the initial stage of entering the diffuser, providing a relatively smooth start for the subsequent gas flow, and avoiding air flow turbulence caused by excessive changes in the inner diameter of the air inlet section, thereby affecting the working efficiency and stability of the vacuum pump.

[0036] Secondly, the inner diameter of the second air inlet section 82 gradually decreases along the direction of gas flow, which not only gradually accelerates the gas flow rate, thereby increasing the kinetic energy of the gas and providing greater power for the subsequent diffusion process; but also this acceleration effect helps to improve the vacuum pump's suction capacity, and can draw gas into the diffuser more quickly.

[0037] Again, the inner diameter of the third air inlet section 83 remains unchanged, which enables the accelerated gas to maintain a stable flow rate and pressure at this stage, preparing for entering the air outlet section 84. Therefore, at this stage, the flow state of the gas is relatively stable, which is conducive to improving the working reliability of the vacuum pump.

[0038] Finally, the inner diameter of the outlet section 84 gradually increases along the direction of gas flow, which not only causes the gas to gradually slow down in the outlet section 84, reducing the gas flow rate, thereby reducing the energy loss when the gas is discharged; but the gradual increase in the inner diameter also helps to reduce the gas pressure, making the discharged gas more stable, reducing the impact and vibration on the subsequent pipeline system.

[0039] In addition, this design can also improve the exhaust efficiency of the vacuum pump, ensuring that the gas can be smoothly discharged from the diffuser and enter the next stage of processing equipment or discharged into the atmosphere.

[0040] The inner wall curved surface of the rear section circulation cavity 10 matches the impeller curved surface of the vacuum pump.

[0041] With this design, first, the inner wall curve of the rear-section circulation cavity 10 matches the impeller curve of the vacuum pump, which enables the gas discharged from the impeller to enter the rear-section circulation cavity 10 more smoothly. This good matching reduces the resistance during the gas flow process, increases the gas flow rate and flow rate, and thus improves the vacuum pumping efficiency.

[0042] Secondly, the matching curved surface design can reduce the turbulence and eddy current of the gas at the junction of the flow chamber 8 and the impeller. Reducing turbulence and eddy current can reduce energy loss, making the vacuum pump more energy-efficient and efficient during operation; at the same time, it also reduces the noise and vibration caused by turbulence, and improves the operating stability and reliability of the equipment.

[0043] In addition, this design can also make the transition of gas between the impeller and the rear section flow chamber 10 smoother, reduce the impact wear on the impeller and the inner wall of the flow chamber 8, and extend the service life of the vacuum pump.

[0044] For ordinary technicians in this field, based on the teachings of this utility model, without departing from the principles and spirit of this utility model, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of this utility model.

Claims

1. A split diffuser for a magnetically suspended turbine vacuum pump, characterized in that: The invention comprises a front diffuser (1) and a rear diffuser (2), wherein a connecting flange (3) is integrally connected to an outer side wall of one end of the front diffuser (1) close to the rear diffuser (2), and a plurality of connecting flange holes (4) are opened on the connecting flange (3) along its circumference, and a plurality of connecting screw holes (5) are evenly distributed along its circumference at the end of the rear diffuser (2) close to the front diffuser (1), and the connecting flange holes (4) correspond to the connecting screw holes (5) one by one, and the connecting flange holes (4) and the connecting screw holes (5) are aligned with each other. The holes (5) are connected by fastening bolts (6), a connecting groove (7) is provided at the end of the rear diffuser (2) close to the front diffuser (1), and the end of the front diffuser (1) close to the rear diffuser (2) is adapted to the connecting groove (7), and a front flow cavity (9) and a rear flow cavity (10) are respectively provided in the front diffuser (1) and the rear diffuser (2), and the front flow cavity (9) and the rear flow cavity (10) are connected to form a flow cavity (8) with a Venturi structure.

2. The split diffuser for a magnetically levitated turbine vacuum pump according to claim 1, characterized in that: An annular clamp groove (11) is provided on the outer side wall of one end of the front diffuser (1) away from the rear diffuser (2).

3. The split diffuser for a magnetically suspended turbine vacuum pump according to claim 2, characterized in that: A mounting flange (12) is integrally connected to the outer side wall of the rear diffuser (2) body, and a plurality of mounting flange holes (13) are provided on the mounting flange (12) along its circumference.

4. The split diffuser for a magnetically levitated turbine vacuum pump according to claim 3, characterized in that: The circulation cavity (8) comprises a first air inlet section (81), a second air inlet section (82), a third air inlet section (83), and an air outlet section (84) which are connected in sequence.

5. The split diffuser for a magnetically suspended turbine vacuum pump according to claim 4, characterized in that: The inner diameter of the first air inlet section (81) remains unchanged, the inner diameter of the second air inlet section (82) gradually decreases along the direction of gas flow, the inner diameter of the third air inlet section (83) remains unchanged, and the inner diameter of the air outlet section (84) gradually increases along the direction of gas flow.

6. The split diffuser for a magnetically suspended turbine vacuum pump according to claim 5, characterized in that: The inner wall curved surface of the rear section circulation cavity (10) matches the impeller curved surface of the vacuum pump.

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