Novel centrifugal vacuum pump unit

Abstract

The utility model discloses a novel centrifugal vacuum pump unit. Comprising a communicating square pipe, a double-shaft motor, a second vacuum pump air outlet, a second vacuum pump air inlet square box air inlet, a second vacuum pump air inlet square box, a double-shaft motor power output shaft, a second vacuum pump air inlet box air outlet, a second vacuum pump air inlet, a working wheel, a long blade, a second vacuum pump, a short blade, a first guide blade and a second guide blade. And a working wheel fairing and a first vacuum pump. According to the centrifugal vacuum pump unit, a dust remover in a traditional centrifugal vacuum pump unit is removed, and the two-stage vacuum pump directly conveys materials from the negative pressure pipeline to the discharging pipe through the first vacuum pump air inlet, that is, the materials can be directly conveyed without dust removal, so that the working efficiency of the centrifugal vacuum pump unit can be effectively improved; the working wheel and the flow guide cover can stabilize flow, so that airflow uniformly enters an air inlet of the first vacuum pump, impact of the airflow is relieved, the airflow is uniform, efficiency is improved, and work is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline negative pressure material transportation, in particular to a novel centrifugal vacuum pump unit. Background Art

[0002] The centrifugal vacuum pump units used in the existing material conveying devices often have debris blocking the impeller when the material enters the working impeller, which needs to be dismantled and cleared. The impeller inlet is not equipped with a fairing cap and an airflow guide cover. The airflow particles directly impact the working impeller rear disk and the blade root, causing serious wear. The existing working impeller blade outlet angle is radial, and the particles cause greater wear on the blade outlet section, resulting in reduced impeller wear and seriously affecting the performance of the vacuum pump. Therefore, most of the existing vacuum pump units need to be used in conjunction with a dust collector, in which the inlet of the dust collector is connected to the on-site suction pipe or negative pressure pipeline, and the outlet of the dust collector is connected to the centrifugal vacuum pump. The dust collector is used to filter out the material in the gas so that the centrifugal vacuum pump unit can operate normally. The disadvantage is that the outer surface material layer of the filter screen in the dust collector increases the airflow resistance and air leakage, which reduces the efficiency of the centrifugal vacuum pump unit. In addition, as the material accumulates in the dust collector, the stability of the unit operation will decrease. The dust collector needs to be cleaned frequently, and maintenance is more frequent, which increases the operating cost. Utility Model Content

[0003] The purpose of the utility model is to provide a novel centrifugal vacuum pump unit to solve the above-mentioned problems.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a novel centrifugal vacuum pump unit, including a connecting square tube, a double-shaft motor, a second vacuum pump air outlet, a second vacuum pump air inlet square box air inlet, a second vacuum pump air inlet square box, a double-shaft motor power output shaft, a second vacuum pump air inlet box air outlet, a second vacuum pump air inlet, a working wheel, a long blade, a second vacuum pump, a short blade, a first guide blade, a guide cover, a first vacuum pump, a first vacuum pump air inlet, a second guide blade, a first straightening cap, a second straightening cap, a first vacuum pump air outlet, The first volute casing, the second volute casing and the debris separation device, the two working wheels in the first volute casing and the second volute casing are respectively fixedly connected to the two shaft ends of the dual-axis motor and the power output shaft, the debris separation device is connected with the first vacuum pump air inlet, the first vacuum pump air outlet and the second vacuum pump air inlet square box by a connecting square tube that passes through the bottom of the machine base, the connecting square tube air inlet is connected to the first vacuum pump air outlet, the connecting square tube air outlet is connected to the second vacuum pump air inlet box air inlet, and the second vacuum pump air inlet box air outlet is connected to the second vacuum pump air inlet.

[0005] Preferably, the long blades and the short blades are arranged at intervals, the blade shape is a backward-inclined anti-wear blade, and a nickel-chromium alloy anti-wear layer is provided on the blade surface.

[0006] Preferably, a deflector cover is provided at the inlet of the impeller, and a first fairing cap and a second fairing cap are provided at the inlet center of the impeller.

[0007] Preferably, a first guide vane and a second guide vane are installed at the bends at both ends of the connecting square tube, and a nickel-chromium alloy anti-wear layer is provided on the surfaces of the first guide vane and the second guide vane.

[0008] Preferably, a debris separation device is provided on one side of the air inlet of the first vacuum pump, a filter plate is provided in the inner cavity of the debris separation device, a first pressure sensor and a second pressure sensor are respectively provided on both sides of the debris separation device, and a discharge outlet is provided on one side of the debris separation device.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0010] The utility model removes the dust collector in the traditional centrifugal vacuum pump unit and adds a first-level debris separation device. The centrifugal vacuum pump unit directly transports the material from the negative pressure pipeline to the discharge pipe through the debris separation device, that is, the material can be directly transported without dust removal, which can effectively improve the working efficiency of the centrifugal vacuum pump unit. The working impeller inlet guide cover can stabilize the flow, so that the airflow enters and fills the space between the working impeller wheel cover and the wheel disc blades in a uniform layer, reducing the impact of the airflow on the working impeller wheel disc and the blade root, and the working impeller blades evenly work on the airflow to improve efficiency. Stable operation: Reduce the impact and wear of materials on the rear disc and the root of the blade. The blade shape is designed as a backward curved type with a low outlet wind speed and good anti-wear function. Since the outlet wind speed of the backward curved blade is low and the friction resistance is small, the efficiency can be improved, and the impact of particles on the outlet section of the blade is reduced, the wear is reduced and the service life of the working wheel is increased. Since the inlet end of the blade is added with an impeller inlet guide cover, part of the airflow enters the upper part of the blade through the guide, which can make the particles on the blade outlet surface evenly distributed, and the impact area of ​​the material on the volute of the vacuum pump is correspondingly increased, and the abrasive particles are evenly distributed, which can extend the service life of the vacuum pump casing. Through the hot spraying process, a nickel-chromium alloy anti-wear layer is formed on the working impeller and the inlet guide cover, so that the working impeller has a wear-resistant surface layer, ensuring the long-term stable operation of the centrifugal vacuum pump unit. When the two working impellers are working, the force direction is relative, and the coaxial reverse installation can offset the axial thrust of the working impeller on the power output shaft of the dual-axis motor, reducing the destructive force of the axial thrust on the support bearing of the power output shaft, extending the life of the dual-axis motor, and making the centrifugal vacuum pump unit work more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of the centrifugal vacuum pump unit of the utility model;

[0012] Figure 2 This is a schematic diagram of the first vacuum pump casing of the centrifugal vacuum pump unit of the utility model;

[0013] Figure 3 This is a schematic diagram of the second vacuum pump casing of the centrifugal vacuum pump unit of the utility model;

[0014] Figure 4 This is a schematic diagram of the structure of the first pressure sensor of the utility model;

[0015] Figure 5 This is a schematic diagram of the structure of the filter plate of the utility model.

[0016] In the figure: 1. connecting square tube; 2. double-axis motor; 3. second vacuum pump air outlet; 4. second vacuum pump air inlet square box air inlet; 5. second vacuum pump air inlet square box; 6. double-axis motor power output shaft; 7. second vacuum pump air inlet box air outlet; 8. second vacuum pump air inlet; 9. working wheel; 10. long blade; 11. second vacuum pump; 12. short blade; 13. first guide blade; 14. guide cover; 15. first vacuum pump; 16. first vacuum pump air inlet; 17. second guide blade; 18. first straightening cap; 19. second straightening cap; 20. first vacuum pump first air outlet; 21. first volute casing; 22. second volute casing; 23. debris separation device; 24. first pressure sensor; 25. discharge outlet; 26. filter plate; 27. second pressure sensor. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-5A novel centrifugal vacuum pump unit includes a connecting square tube 1, a double-shaft motor 2, a second vacuum pump outlet 3, a second vacuum pump air inlet square box air inlet 4, a second vacuum pump air inlet square box 5, a double-shaft motor power output shaft 6, a second vacuum pump air inlet box outlet 7, a second vacuum pump air inlet 8, a working wheel 9, a long blade 10, a second vacuum pump 11, a short blade 12, a first guide blade 13, a guide cover 14, a first vacuum pump 15, a first vacuum pump air inlet 16, a second guide The blade 17, the first fairing cap 18, the second fairing cap 19, the first vacuum pump outlet 20, the first volute casing 21 and the second volute casing 22 and the debris separation device 23, the two working wheels 9 in the first volute casing 21 and the second volute casing 22 are respectively fixedly connected to the two shaft ends of the dual-axis motor 2 and the power output shaft 6, and the debris separation device 23 is connected to the first vacuum pump air inlet 16, the first vacuum pump outlet 20 and the second vacuum pump air inlet box 5 through the communication with the bottom of the machine base A square tube 1 is provided, and a first guide blade 13 and a second guide blade 17 are installed at the bends at both ends of the connecting square tube 1. The air inlet of the connecting square tube 1 is connected to the air outlet 20 of the first vacuum pump, and the air outlet of the connecting square tube 1 is connected to the air inlet 4 of the second vacuum pump air inlet box, and the air outlet 7 of the second vacuum pump air inlet box is connected to the air inlet 8 of the second vacuum pump. The long blades 10 and the short blades 12 are arranged at intervals, and the blade shape is a backward inclined anti-wear blade, and a nickel-chromium alloy anti-wear layer is provided on the blade surface. A guide cover 14 is provided at the inlet of the working wheel 9, and a first straightening cap 18 and a second straightening cap 19 are provided at the inlet center of the working wheel 9. The surfaces of the first guide blade 13 and the second guide blade 17 are provided with a nickel-chromium alloy anti-wear layer. A debris separation device 23 is provided on one side of the first vacuum pump air inlet 16, and a filter plate 26 is provided in the inner cavity of the debris separation device 23. A first pressure sensor 24 and a second pressure sensor 27 are respectively provided on both sides of the debris separation device 23, and a discharge outlet 25 is provided on one side of the debris separation device 23.

[0019] During use, by removing the dust collector in the traditional centrifugal vacuum pump unit, the two-stage vacuum pump directly transports the material from the negative pressure pipeline to the discharge pipe through the first vacuum pump air inlet 16, that is, the material can be directly transported without dust removal, which can effectively improve the working efficiency of the centrifugal vacuum pump unit. The working wheel 9 and the air guide cover 14 can stabilize the flow, so that the airflow enters the first vacuum pump air inlet 16 evenly, reducing the impact of the airflow. The uniform airflow improves efficiency, stable operation, and reduces the impact and wear of the material on the rear disc and the root of the blades. The backward curved blades can effectively improve efficiency, reduce blade outlet wear and increase service life, reduce the impact of materials on the vacuum pump volute casing, and extend the service life of the vacuum pump casing. A nickel-chromium alloy anti-wear layer is formed on the working wheel 9 and the air guide cover 14 through a hot spraying process, so that the working wheel 9 and the air guide cover 14 have a wear-resistant surface layer, ensuring that the centrifugal vacuum pump unit operates stably for a long time. When the working wheel 9 is working, the force direction is relative, and the coaxial reverse installation can offset the working wheel 9 on the double The axial thrust of the power output shaft 6 of the dual-axis motor reduces the destructive force of the axial thrust on the power output shaft support bearing, prolongs the service life of the dual-axis motor 2, and makes the centrifugal vacuum pump unit work more stably. The first guide vane 13 and the second guide vane 17 are installed at the bends at both ends of the connecting square tube 1 to reduce the resistance loss of the bend and reduce the wear of the material on the tube wall. Improve the material conveying efficiency, so that the airflow passes smoothly through the connecting square tube 1 and smoothly turns to enter the bend blade at the outlet end of the connecting square tube 1. The bend guide vane rectification improves the flow rate of the new centrifugal vacuum pump unit. The pressure on both sides of the filter plate 26 can be detected by the first pressure sensor 24 and the second pressure sensor 27. When the detected pressure exceeds the preset setting values ​​of the first pressure sensor 24 and the second pressure sensor 27, it will be connected to the external alarm to alarm. At this time, the user can open the discharge outlet 25 and then clean up the debris on the surface of the filter plate 26, which can effectively improve the material transmission efficiency.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel centrifugal vacuum pump unit, comprising a connecting square pipe (1), a double-shaft motor (2), a second vacuum pump air outlet (3), a second vacuum pump air inlet square box air inlet (4), a second vacuum pump air inlet square box (5), a double-shaft motor power output shaft (6), a second vacuum pump air inlet box air outlet (7), a second vacuum pump air inlet (8), a running wheel (9), a long blade (10), a second vacuum pump (11), a short blade (12), a first guide blade (13), a guide cover (14), a first vacuum pump (15), a first vacuum pump air inlet (16), a second guide blade (17), a first straightening cap (18), a second straightening cap (19), a first vacuum pump air outlet (20), a first volute casing (21) and a second volute casing (22) and a debris separation device (23), characterized in that: The two working wheels (9) in the first volute casing (21) and the second volute casing (22) are respectively fixedly connected to the two shaft ends of the dual-axis motor (2) and the power output shaft (6); the debris separation device (23) is connected to the first vacuum pump air inlet (16), the first vacuum pump air outlet (20) and the second vacuum pump air inlet box (5) via a connecting square tube (1) that passes through the bottom of the machine base; the air inlet of the connecting square tube (1) is connected to the first vacuum pump air outlet (20); the air outlet of the connecting square tube (1) is connected to the air inlet (4) of the second vacuum pump air inlet box; and the air outlet (7) of the second vacuum pump air inlet box is connected to the air inlet (8) of the second vacuum pump.

2. A novel centrifugal vacuum pump unit according to claim 1, characterized in that: The long blades (10) and the short blades (12) are arranged at intervals, and the blades are backward-inclined anti-wear blades, and a nickel-chromium alloy anti-wear layer is provided on the surface of the blades.

3. A novel centrifugal vacuum pump unit according to claim 1, characterized in that: The inlet of the impeller (9) is provided with a deflector (14), and the inlet center of the impeller (9) is provided with a first fairing cap (18) and a second fairing cap (19).

4. A novel centrifugal vacuum pump unit according to claim 1, characterized in that: A first guide vane (13) and a second guide vane (17) are installed at the bends at both ends of the connecting square tube (1), and a nickel-chromium alloy anti-wear layer is provided on the surface of the first guide vane (13) and the second guide vane (17).

5. A novel centrifugal vacuum pump unit according to claim 1, characterized in that: A debris separation device (23) is provided on one side of the air inlet (16) of the first vacuum pump, a filter plate (26) is provided in the inner cavity of the debris separation device (23), a first pressure sensor (24) and a second pressure sensor (27) are provided on both sides of the debris separation device (23), and a discharge outlet (25) is provided on one side of the debris separation device (23).

Images