Efficient centrifugal fan vacuum pump
By employing a segmented structure consisting of a plug rod, a flexible coupling, and a central shaft, combined with anti-deviation adjustment components and a pressurizing mechanism, the shaft deflection and bearing wear problems of the cantilever centrifugal fan vacuum pump are solved, achieving stable operation of the equipment and extending its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-23
- Publication Date
- 2026-03-10
AI Technical Summary
The pump shaft of the cantilever centrifugal vacuum pump has a large span, which is prone to deflection when rotating at high speed. This causes friction between the impeller and the pump casing, resulting in high load on the bearings, rapid wear, and loud vibration and noise.
It adopts a segmented structure of insert rod, flexible coupling and central shaft, combined with anti-deviation adjustment component and adjustment pressure mechanism. Vibration is absorbed by flexible coupling, and the clamping force of bearing is monitored and adjusted in real time to ensure that the shaft system rotates in the design center and prevent wear.
It effectively reduces the actual stress span of the pump shaft, lowers the wear rate of the bearings, reduces equipment noise and vibration, and improves the stability and lifespan of the equipment.
Smart Images
Figure CN121630767A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of centrifugal fan vacuum pump technology, specifically a high-efficiency centrifugal fan vacuum pump. Background Technology
[0002] With increasingly stringent requirements for the conductivity and mechanical strength of copper rods from downstream industries such as power cables and electronic components, low-oxygen copper rods with an oxygen content of ≤10ppm have become the mainstream product in the market. Vacuum degassing is a key process for purifying molten copper. In the emulsion filter of the copper rod continuous casting and rolling production line, centrifugal fan vacuum pumps are mainly used to provide vacuum suction to drive the emulsion filtration process (such as pumping out emulsions containing impurities and maintaining a vacuum environment in the filtration chamber). The vacuum pump needs to provide negative pressure to separate impurities from the emulsion. A multi-stage centrifugal fan vacuum pump is a highly efficient vacuum device based on the principle of centrifugal force, using a multi-stage impeller axial series design to achieve step-by-step gas depressurization, suction, and transport. It integrates the high flow rate advantage of centrifugal fluid machinery with the high vacuum characteristics of multi-stage compression, enabling the completion of exhaust pressurization from "low pressure → medium pressure → high pressure" and suction depressurization from "normal pressure → low vacuum → high vacuum" within a single device.
[0003] Currently, the cantilever centrifugal vacuum pumps used in copper rod continuous casting and rolling production lines are characterized by impellers directly mounted on the cantilever end of the pump shaft (without intermediate support), with the shaft system supported only by a bearing at one end. This cantilever structure results in a large pump shaft span, making the shaft system prone to deflection during high-speed rotation. This leads to uneven clearance between the impeller and the pump casing, increasing the risk of "rotor swiping" (friction between the impeller and the pump casing). Shaft deflection exacerbates the unbalanced vibration of the impeller, which is transmitted to the pump body and foundation through the bearings, resulting in increased equipment noise. Long-term operation may lead to pipe loosening and component fatigue fracture. On the other hand, the weight of the impeller, the radial force and axial force of the medium are all borne by the bearing at the cantilever end. The combined load on the bearing is much higher than that of a centrifugal pump supported at both ends. It must not only bear the weight of the impeller but also bear huge radial forces (generated by uneven gas pressure distribution) and axial forces, which accelerates the wear rate of the bearing under high loads.
[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention
[0005] The purpose of this invention is to provide a high-efficiency centrifugal fan vacuum pump to solve the problems mentioned in the background art, such as the large span of the pump shaft caused by the cantilever structure, the easy deflection of the shaft system during high-speed rotation, and the risk of "rotor swiping". On the other hand, the weight of the impeller, the radial force and axial force of the medium are all borne by the bearing at the cantilever end, and the bearing wear rate is accelerated under high load. The technical solution of this invention provides a solution that is significantly different from the existing technology, which is too simple.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency centrifugal fan vacuum pump, comprising a mounting frame, a motor mounted on the top right side of the mounting frame, a connecting platform mounted on the top center of the mounting frame, a fan housing mounted on the top left end of the mounting frame, a connecting shaft rotatably connected inside the connecting platform, insert rods slidably limited at both ends of the connecting shaft, a bearing rotatably mounted inside the fan housing, a pressurizing chamber mounted inside the fan housing, blades mounted on the inner surface of the bearing located inside the pressurizing chamber, fixing plates mounted on the inner walls of both sides of the fan housing, a first rotating plate rotatably connected to one end of the fixing plate near the center inside the fan housing, a second rotating plate provided on the surface of the first rotating plate, an adjusting rod provided on the surface of the second rotating plate, an anti-deviation adjusting component provided on the surface of the second rotating plate, and an adjusting pressurizing mechanism mounted on the surface of the adjusting rod; The anti-deviation adjustment assembly includes a toothed plate installed on the side of the first rotating plate, a gear rotatably connected inside the fan housing, a sliding table limited and slidable in the groove on the surface of the fixed plate, a connecting frame and a buffer plate limited and slidable in the cavity at the bottom of the adjustment rod, and an abutment ring rotatably connected to the bottom of the connecting frame.
[0007] Preferably, the end of the insertion rod near the connecting shaft is designed as a prism, and the connecting shaft has a groove inside. A pressure sensor is installed in the center of the connecting shaft. A sensing plate is installed between the pressure sensor and the insertion rod, and a spring connects the sensing plate and the insertion rod.
[0008] Preferably, a flexible coupling is installed inside the insert rod at both ends of the connecting shaft, away from the connecting shaft; the flexible coupling near the motor end is connected to the motor output end, and the flexible coupling near the fan cover end is connected to the bearing; a dynamic balance detector is installed on the top of the connecting platform.
[0009] Preferably, the fixed plate and the first rotating plate are both provided with inclined grooves of the same specifications. The slide surface slides within the inclined grooves of the fixed plate and the first rotating plate. The adjusting rod slides within the inclined grooves of the slide surface. A spring is installed on the side of the slide near the adjusting rod, and the other end of the spring is connected to the adjusting rod. The fixed plate has four sets of grooves, which are evenly distributed in a circular shape on the surface of the fixed plate.
[0010] Preferably, the surface of the toothed plate is arc-shaped and fits against the side end of the first rotating plate; the side end of the fan housing is rotatably connected to a gear via a driver, and the gear meshes with the teeth on the surface of the toothed plate.
[0011] Preferably, there are two contact rings, one with a notch in the middle and the other with notches at both ends, and the two contact rings are staggered; a spring is installed on the top of the connecting frame, and the other end of the spring is connected to the buffer plate.
[0012] Preferably, the pressurization adjustment mechanism includes an electric push rod installed on the top of the fan housing, with a pressing block installed at the output end of the electric push rod, and a slide rod installed on the surface of the first rotating plate, with a pull rod protruding at the end of the slide rod, and an abutment block sliding laterally in the cavity at the bottom of the adjustment rod.
[0013] Preferably, the second rotating plate slides on the surface of the slide rod, and a spring is installed on the surface of the slide rod. One end of the spring is connected to the second rotating plate, and the other end is connected to the end protrusion of the slide rod.
[0014] Preferably, the abutment block extends out of the adjusting rod and is connected to the pull rod, the bottom of the abutment block has an inclined surface, and the top protrusion of the buffer plate abuts against the inclined surface of the abutment block; the surface of the squeezing block has an inclined surface, and the bottom of the squeezing block extends into the gap between the first rotating plate and the second rotating plate.
[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the addition of a connecting rod, flexible coupling, and connecting platform, and an intermediate shaft, avoids the problem of large pump shaft span and shaft system deflection during high-speed rotation. Furthermore, the motor generates inherent vibrations during startup and high-speed operation; the flexible coupling, utilizing the deformation capability of its elastic elements (such as diaphragms or elastomers), effectively absorbs and buffers the vibrations of the motor output shaft. The intermediate shaft breaks down the original single long cantilever shaft system into a segmented structure of "motor shaft - intermediate shaft - pump shaft." The intermediate shaft provides intermediate support through the connecting platform and connecting rod, significantly reducing the actual force span of the pump shaft.
[0016] 2. This invention, through its anti-deviation adjustment component, can achieve abrasive clamping of the bearing by detecting the dynamic balance of the flexible coupling. Furthermore, when the motor speed is too high, the clamping force on the bearing is synchronously increased based on the detected data, preventing wear on the bearing during centrifugal fan operation. The anti-deviation adjustment component can monitor the dynamic balance of the flexible coupling in real time. When the motor speed increases, the centrifugal force increases, and the shaft system is prone to slight radial oscillation. The component synchronously increases the clamping force on the bearing based on the detected data; the faster the speed, the tighter the clamping, ensuring that the main shaft always rotates around its designed geometric center. Once the flexible coupling becomes dynamically unbalanced, the shaft system will generate periodic radial forces. The anti-deviation component, through its clamping force, forcibly corrects the slight oscillation of the shaft system, ensuring that the bearing always maintains a uniform stress state, eliminating local overheating and stress concentration, and reducing the bearing wear rate to a minimum.
[0017] 3. In this invention, the adjustable pressurization mechanism can simultaneously increase the elastic resistance of the contact ring to the bearing when the motor output end generates lateral vibration. When the motor output end generates lateral (radial) vibration due to load fluctuation or its own dynamic balance problem, the adjustable pressurization mechanism detects this displacement trend and instantly increases the clamping force of the contact ring to the bearing through mechanical linkage. The suppression of lateral movement of the shaft system directly ensures that a safe clearance is always maintained between the high-speed rotating impeller and the stationary pump casing. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an exploded structural diagram of the connecting platform of the present invention; Figure 3 This is a cross-sectional structural diagram of the fan casing of the present invention; Figure 4 This is a cross-sectional structural schematic diagram of the fan casing of the present invention from another perspective; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A; Figure 6 This is a schematic diagram of the structure of the fixing plate and the first rotating plate of the present invention; Figure 7 This is an exploded structural diagram of the first and second rotating plates of the present invention; Figure 8 This is a schematic diagram of the structure of the adjusting rod and the slide table of the present invention; Figure 9 This is a schematic cross-sectional view of a portion of the adjusting rod of the present invention; Figure 10 This is an exploded structural diagram of the connecting frame and the contact ring of the present invention.
[0019] In the diagram: 1. Mounting bracket; 2. Motor; 3. Connecting platform; 4. Fan housing; 5. Connecting shaft; 6. Insert rod; 7. Pressure sensor; 8. Flexible coupling; 9. Bearing; 10. Pressure chamber; 11. Blade; 12. Fixing plate; 13. First rotating plate; 14. Second rotating plate; 15. Adjusting rod; 181. Gear plate; 182. Gear; 183. Slide table; 184. Connecting bracket; 185. Contact ring; 186. Buffer plate; 191. Electric push rod; 192. Pressing block; 193. Slide rod; 194. Pull rod; 195. Contact block. Detailed Implementation
[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.
[0021] Please see Figures 1-10 This invention provides a technical solution: a high-efficiency centrifugal fan vacuum pump, including a mounting frame 1, a motor 2 mounted on the top right side of the mounting frame 1, a connecting platform 3 mounted on the top center of the mounting frame 1, and a fan housing 4 mounted on the top left end of the mounting frame 1. A connecting shaft 5 is rotatably connected inside the connecting platform 3. Insert rods 6 are slidably positioned at both ends of the connecting shaft 5. The end of the insert rod 6 near the connecting shaft 5 is a prism design, and the connecting shaft 5 has a groove inside. A pressure sensor 7 is installed in the center inside the connecting shaft 5. Flexible couplings 8 are installed at the ends of the insert rods 6 that are slidably positioned at both ends of the connecting shaft 5, away from the connecting shaft 5. The flexible coupling 8 near the motor 2 is connected to the output end of the motor 2, and the flexible coupling 8 near the fan housing 4 is connected to the motor housing 4. The device 8 is connected to the bearing 9. A dynamic balance detector is installed on the top of the connecting platform 3. A sensing plate is installed between the pressure sensor 7 and the plug rod 6. A spring is connected between the sensing plate and the plug rod 6. The bearing 9 is rotatably installed inside the fan housing 4. A pressurizing chamber 10 is installed inside the fan housing 4. The bearing 9 is located on the inner surface of the pressurizing chamber 10 and blades 11 are installed. Fixing plates 12 are installed on the inner walls of both sides of the fan housing 4. A first rotating plate 13 is rotatably connected to one end of the fixing plate 12 near the center of the fan housing 4. A second rotating plate 14 is provided on the surface of the first rotating plate 13. An adjusting rod 15 is provided on the surface of the second rotating plate 14. An anti-deviation adjustment component is provided on the surface of the second rotating plate 14. An adjusting pressurization mechanism is installed on the surface of the adjusting rod 15. The motor 2 output end drives the insertion rod 6 to rotate via the flexible coupling 8 at its end, causing the connecting shaft 5 to rotate inside the connecting platform 3. Then, the insertion rod 6 at the other end of the connecting shaft 5 drives the bearing 9 to rotate inside the fan housing 4 via the flexible coupling 8 on its surface. Simultaneously, the rotation of the bearing 9 drives the blades 11 to rotate, creating a suction negative pressure inside the pressurization chamber 10. The motor 2 generates inherent vibrations during startup and high-speed operation. The flexible coupling 8 effectively absorbs and buffers the vibrations of the motor 2 output shaft by utilizing the deformation capabilities of its elastic elements, such as diaphragms and elastomers. By adding an intermediate shaft, the originally single long cantilever shaft system is disassembled into a segmented structure of "output end - intermediate shaft - pump shaft". The intermediate shaft provides intermediate support through the connecting platform 3 and the insertion rod 6, significantly reducing the actual force span of the pump shaft.
[0022] In one embodiment of the present invention, the anti-deviation adjustment assembly includes a toothed plate 181 installed on the side end of the first rotating plate 13. The surface of the toothed plate 181 is arc-shaped and fits against the side end of the first rotating plate 13. A gear 182 is rotatably connected to the side end of the fan housing 4 via a driver, and the gear 182 meshes with the teeth on the surface of the toothed plate 181. The gear 182 is rotatably connected inside the fan housing 4. A slide table 183 is limited and slidably positioned within a groove on the surface of the fixed plate 12. Both the fixed plate 12 and the first rotating plate 13 have inclined grooves of the same specifications. The surface of the slide table 183 is limited and slidably positioned within the inclined grooves of the fixed plate 12 and the first rotating plate 13. An adjusting rod 15 is limited and slidably positioned within the inclined grooves of the slide table 183. The sliding table 183 has a spring installed on the side near the adjusting rod 15, and the other end of the spring is connected to the adjusting rod 15. The fixed plate 12 has four sets of grooves on its surface, which are evenly distributed in a circular shape. The adjusting rod 15 has a connecting frame 184 and a buffer plate 186 that slide within the bottom cavity. The bottom of the connecting frame 184 is rotatably connected to two abutment rings 185. One abutment ring 185 has a notch in the middle, and the other abutment ring 185 has notches at both ends. The two abutment rings 185 are staggered at this time. The top of the connecting frame 184 has a spring installed, and the other end of the spring is connected to the buffer plate 186. When the dynamic balancing detector detects a deviation in the flexible coupling 8, the controller drives the gear 182 to rotate the gear plate 181. Simultaneously, the rotation of the gear plate 181 causes the first rotating plate 13 to rotate on the surface of the fixed plate 12. At this time, the rotation of the fixed plate 12 causes the slide table 183 to slide within the inclined grooves on the surfaces of the fixed plate 12 and the first rotating plate 13. This, in turn, causes the slide table 183 to slide towards the bearing 9 within the grooves on the surface of the fixed plate 12, allowing the contact ring 185 to contact the bearing 9. The two sets of staggered contact rings 185 provide stable support for the bearing 9. While the contact rings 185 are contacting the bearing 9, they also compress the top spring of the connecting frame 184, reducing the rigid contact force on the bearing 9. At this time, the top spring of the connecting frame 184 is compressed, and its elasticity during return maintains the contact force on the bearing 9. When the deviation of the flexible coupling 8 increases... The amplitude of the rotation of gear 182 driven by the driver increases synchronously, thereby increasing the distance that slide table 183 slides towards bearing 9 in the groove on the surface of fixed plate 12, and synchronously increasing the resistance force on bearing 9. By detecting the dynamic balance of the flexible coupling, the bearing 9 is clamped against the driver. When the speed of motor 2 is too fast, the resistance effect on bearing 9 is synchronously increased according to the detected data to prevent wear on bearing 9 during centrifugal fan operation. The anti-deviation adjustment component can monitor the dynamic balance status of flexible coupling 8 in real time. The component synchronously increases the resistance clamping force on bearing 9 according to the detected data. The faster the speed, the tighter the clamping force, ensuring that the main shaft always rotates at the designed geometric center. The anti-deviation component forcibly corrects the slight wobble of the shaft system through resistance clamping, so that bearing 9 always maintains a uniform stress state, eliminating local overheating and stress concentration, and reducing the wear rate of bearing 9 to a minimum level.
[0023] In one embodiment of the present invention, the pressurization adjustment mechanism includes an electric push rod 191 mounted on the top of the fan housing 4, an extrusion block 192 mounted on the output end of the electric push rod 191, and a slide rod 193 mounted on the surface of the first rotating plate 13. A pull rod 194 is mounted on the protrusion at the end of the slide rod 193. An abutment block 195 slides laterally in the bottom cavity of the adjusting rod 15. The second rotating plate 14 slides on the surface of the slide rod 193. A spring is mounted on the surface of the slide rod 193. One end of the spring is connected to the second rotating plate 14, and the other end is connected to the protrusion at the end of the slide rod 193. The abutment block 195 extends out of one end of the adjusting rod 15 and is connected to the pull rod 194. An inclined surface is provided at the bottom of the abutment block 195. The top protrusion of the buffer plate 186 abuts against the inclined surface of the abutment block 195. An inclined surface is provided on the surface of the extrusion block 192, and the bottom of the extrusion block 192 extends into the gap between the first rotating plate 13 and the second rotating plate 14. When the output end of motor 2 generates lateral vibration, the insertion rod 6 slides inward toward the connecting shaft 5 due to the contact with the output end, thereby applying pressure to the sensing plate on the side of the pressure sensor 7. At this time, the pressure sensor 7 senses the pressure of the sensing plate and drives the extension end of the electric push rod 191 to push the pressing block 192 down, so that the inclined surface of the pressing block 192 contacts the back end of the second rotating plate 14, causing it to slide on the surface of the slide rod 193. At the same time, the second rotating plate 14 contacts the adjusting rod 15, causing it to slide on the surface of the slide table 183. At this time, the inclined surface at the bottom end of the pull rod 194 will gradually press the top of the buffer plate 186. The protrusion causes the buffer plate 186 to move downward within the cavity at the bottom of the adjusting rod 15, increasing the elastic resistance of the connecting frame 184. When lateral vibration occurs at the output end of the motor 2, the elastic resistance of the contact ring 185 against the bearing 9 is increased simultaneously. When the output end of the motor 2 experiences lateral radial vibration due to load fluctuations or its own dynamic balance problem, the adjusting pressurizing mechanism detects this displacement trend and instantly increases the clamping force of the contact ring 185 against the bearing 9 through mechanical linkage. The suppression of lateral movement of the shaft system directly ensures that a safe clearance is always maintained between the high-speed rotating impeller and the stationary pump casing.
[0024] Working principle: When using this multi-stage centrifugal blower vacuum pump for copper rod continuous casting and rolling production line, the output end of motor 2 drives the insertion rod 6 to rotate through the flexible coupling 8 at its end, causing the connecting shaft 5 to rotate inside the connecting platform 3. Then, the insertion rod 6 at the other end of the connecting shaft 5 drives the bearing 9 to rotate inside the blower housing 4 through the flexible coupling 8 on its surface. At the same time, the rotation of bearing 9 drives the blades 11 to rotate, creating a suction negative pressure inside the pressurization chamber 10, thereby increasing the air pressure output inside the blower housing 4. When the dynamic balancing detector detects a deviation in the flexible coupling 8, the controller drives the gear 182 to rotate the gear plate 181. Simultaneously, the rotation of the gear plate 181 causes the first rotating plate 13 to rotate on the surface of the fixed plate 12. At this time, the rotation of the fixed plate 12 causes the slide table 183 to slide within the inclined grooves on the surfaces of the fixed plate 12 and the first rotating plate 13. This, in turn, causes the slide table 183 to slide towards the bearing 9 within the grooves on the surface of the fixed plate 12, allowing the contact rings 185 to contact the bearing 9. The two sets of staggered contact rings 185 can effectively contact the shaft. The bearing 9 provides stable support. While the contact ring 185 contacts the bearing 9, it also squeezes the top spring of the connecting frame 184, reducing the rigid contact force on the bearing 9. At this time, the top spring of the connecting frame 184 is compressed. The elastic performance of the spring when it returns to its original position can maintain the contact force on the bearing 9. When the deviation of the flexible coupling 8 is detected to be large, the amplitude of the drive driving the gear 182 to rotate is increased synchronously, thereby increasing the distance that the slide table 183 slides in the groove on the surface of the fixed plate 12 towards the bearing 9, and simultaneously increasing the contact force on the bearing 9. When the output end of the motor 2 generates lateral vibration, the insertion rod 6 slides into the connecting shaft 5 due to the contact of the output end, thereby applying pressure to the sensing plate on the side of the pressure sensor 7. At this time, the pressure sensor 7 senses the pressure of the sensing plate and drives the extension end of the electric push rod 191 to push the pressing block 192 down, so that the inclined surface of the pressing block 192 contacts the back end of the second rotating plate 14, causing it to slide on the surface of the slide rod 193. At the same time, the second rotating plate 14 contacts the adjusting rod 15, causing it to slide on the surface of the slide table 183. At this time, the inclined surface at the bottom end of the pull rod 194 will gradually press the top protrusion of the buffer plate 186, thereby causing the buffer plate 186 to move down in the bottom cavity of the adjusting rod 15, increasing the elastic contact force of the connecting frame 184.
[0025] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A high efficiency centrifugal fan vacuum pump comprising a mounting frame (1), characterized in that: The motor (2) is installed on the top right side of the mounting frame (1), the connecting table (3) is installed on the top center of the mounting frame (1), the fan cover (4) is installed on the top left end of the mounting frame (1), the connecting shaft (5) is rotatably connected inside the connecting table (3), the plug rod (6) is limitingly and slidably arranged at the both ends of the connecting shaft (5), the bearing (9) is rotatably installed inside the fan cover (4), the pressure increasing cavity (10) is installed inside the fan cover (4), the blade (11) is installed on the inner surface of the pressure increasing cavity (10), the fixed plate (12) is installed on the both sides of the inner wall of the fan cover (4), the first rotating plate (13) is rotatably connected to the inner side of the fan cover (4) near the central end of the fixed plate (12), the second rotating plate (14) is arranged on the surface of the first rotating plate (13), the adjusting rod (15) is arranged on the surface of the second rotating plate (14), the anti-deviation adjusting assembly is arranged on the surface of the second rotating plate (14), and the adjusting pressure increasing mechanism is installed on the surface of the adjusting rod (15). The anti-deviation adjusting assembly comprises the toothed plate (181) installed on the side end of the first rotating plate (13), the gear (182) rotatably connected inside the fan cover (4), the slide table (183) limitingly and slidably arranged in the groove on the surface of the fixed plate (12), the connecting frame (184) and the buffer plate (186) limitingly and slidably arranged in the cavity at the bottom of the adjusting rod (15), and the abutting ring (185) rotatably connected to the bottom of the connecting frame (184).
2. A high efficiency centrifugal fan vacuum pump according to claim 1, characterized in that: The plug rod (6) is designed as a prism near one end of the connecting shaft (5), a prism groove is formed in the connecting shaft (5), and the pressure sensor (7) is installed in the connecting shaft (5).
3. A high efficiency centrifugal fan vacuum pump according to claim 2, characterized in that: The flexible coupling (8) is installed in the plug rod (6) at the both ends of the connecting shaft (5) away from the connecting shaft (5), the flexible coupling (8) near the motor (2) is connected to the output end of the motor (2), the flexible coupling (8) near the fan cover (4) is connected to the bearing (9), and the dynamic balance detector is installed on the top of the connecting table (3).
4. A high efficiency centrifugal fan vacuum pump according to claim 3, characterized in that: The inclined grooves with the same specifications are formed on the surfaces of the fixed plate (12) and the first rotating plate (13), the slide table (183) is limitingly and slidably arranged in the inclined grooves of the fixed plate (12) and the first rotating plate (13), the adjusting rod (15) is limitingly and slidably arranged on the surface of the slide table (183), the spring is installed on the side of the slide table (183) near the adjusting rod (15), and the other end of the spring is connected to the adjusting rod (15); the number of the grooves on the surface of the fixed plate (12) is four, and the four grooves are evenly distributed on the surface of the fixed plate (12) in a circumferential shape.
5. A high efficiency centrifugal fan vacuum pump according to claim 4, characterized in that: The surface of the toothed plate (181) is arc-shaped and is attached to the side end of the first rotating plate (13); the gear (182) is rotatably connected to the side end of the fan cover (4) through the driver, and the gear (182) is engaged with the teeth on the surface of the toothed plate (181).
6. A high efficiency centrifugal fan vacuum pump according to claim 1, characterized in that: The number of the abutting rings (185) is two, a middle part of one abutting ring (185) is provided with a gap, both ends of the other abutting ring (185) are provided with gaps, and the two abutting rings (185) are staggered; the top of the connecting frame (184) is provided with a spring, and the other end of the spring is connected with the buffer plate (186).
7. A high efficiency centrifugal fan vacuum pump according to claim 1, wherein: The adjusting pressurizing mechanism comprises an electric push rod (191) installed on the top of the fan cover (4), an extruding block (192) installed on the output end of the electric push rod (191), a sliding rod (193) installed on the surface of the first rotating plate (13), a pull rod (194) protrusively installed on the end of the sliding rod (193), and an abutting block (195) laterally sliding in the bottom cavity of the adjusting rod (15).
8. A high efficiency centrifugal fan vacuum pump according to claim 7, characterized in that: The second rotating plate (14) is limitedly slid on the surface of the sliding rod (193), the surface of the sliding rod (193) is provided with a spring, one end of the spring is connected with the second rotating plate (14), and the other end of the spring is connected with the end protrusion of the sliding rod (193).
9. A high efficiency centrifugal fan vacuum pump according to claim 8, characterized in that: The abutting block (195) extends out of one end of the adjusting rod (15) and is connected with the pull rod (194), the bottom of the abutting block (195) is provided with an inclined surface, the top protrusion of the buffer plate (186) abuts against the inclined surface of the abutting block (195); the surface of the extruding block (192) is provided with an inclined surface, and the bottom of the extruding block (192) extends into the gap between the first rotating plate (13) and the second rotating plate (14).