An energy-saving centrifugal compressor

Abstract

The present invention relates to the technical field of compressors, and particularly to an energy-saving centrifugal compressor, which includes a frame, a housing, and a motor. The housing and the motor are installed on the frame. It also includes a wheel disc, a plurality of front blades, a plurality of ventilation holes, a plurality of rear blades, a diversion cavity, and a diffuser pipe. The wheel disc is concentrically installed on the output shaft of the motor. The wheel disc divides the cavity of the housing into a front part and a rear part. A plurality of front blades are evenly installed circumferentially inside the front end face of the wheel disc. A plurality of rear blades are evenly installed circumferentially on the outer circumference of the rear end face of the wheel disc. A plurality of ventilation holes are arranged between the plurality of front blades and the plurality of rear blades. A diversion cavity is provided at the front edge of the housing. An air outlet is provided at the side edge of the housing. The air outlet is communicated with the rear edge of the cavity of the housing. The diffuser pipe is installed on the side wall of the housing. The input end of the diffuser pipe is connected to the air outlet of the housing. It enables the force on the wheel disc to be balanced by the first-stage impeller and the second-stage impeller arranged front and back, improving the overall reliability and energy-saving effect of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to an energy-saving centrifugal compressor. Background Art

[0002] When a centrifugal compressor operates, air is affected by centrifugal force and flows along the blades, causing the air to be compressed. Subsequently, the air flow passes through a diffuser. As the flow area continuously expands, the air flow velocity decreases and the pressure increases. Finally, the compressed air is sent to subsequent equipment or systems through a volute.

[0003] In the prior art, a variety of centrifugal compressors have been proposed. For example, a centrifugal compressor proposed in a Chinese patent application with the publication number CN117231561A includes a rotor system fastened inside a casing main body; a first centrifugal compression impeller and a second centrifugal compression impeller respectively connected to the rotor system; a first diffuser system respectively supporting a first end of the rotor system and the first centrifugal compression impeller; a second diffuser system respectively supporting a second end of the rotor system and the second centrifugal compression impeller; a connecting air passage connecting the first diffuser system and the second diffuser system; and the first centrifugal compression impeller and the second centrifugal compression impeller having opposite rotation directions, which solves the problems of large volume, low efficiency, and high cost of the compressor.

[0004] However, most of the blades of the impellers of existing centrifugal compressors are arranged on the same side of the wheel disc. This causes the axial reaction force received by the impeller when it deflects and accelerates the air to push the entire impeller towards the side away from the blades, resulting in unbalanced forces on the drive shaft and bearings that bear components such as the impeller, increasing the difficulty of designing the drive shaft and bearings and reducing the reliability of the centrifugal compressor. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an energy-saving centrifugal compressor that balances the forces on the wheel disc through a first-stage impeller and a second-stage impeller arranged front and back, improving the overall reliability and energy-saving effect of the compressor.

[0006] An energy-saving centrifugal compressor of the present invention includes a frame, a housing, and a motor. The housing and the motor are installed on the frame. A cavity is provided inside the housing, and an air inlet communicating with the cavity is provided in the middle of the front end of the housing. It further includes a wheel disc, a plurality of front blades, a plurality of ventilation holes, a plurality of rear blades, a diversion cavity, and a diffuser pipe. The wheel disc is concentrically installed on the output shaft of the motor. The wheel disc is located in the middle of the cavity of the housing. The wheel disc divides the cavity of the housing into a front part and a rear part. A plurality of front blades are evenly installed circumferentially inside the front end face of the wheel disc. A plurality of ventilation holes are provided circumferentially in the middle of the wheel disc. A plurality of rear blades are evenly installed circumferentially on the outer circumference of the rear end face of the wheel disc. The plurality of ventilation holes are arranged between the plurality of front blades and the plurality of rear blades. A diversion cavity is provided at the front edge of the housing. The diversion cavity surrounds the outer edge of the plurality of ventilation holes. The diversion cavity guides the air flowing along the plurality of front blades towards the plurality of ventilation holes. An air outlet is provided at the side edge of the housing. The air outlet is communicated with the rear edge of the cavity of the housing. The diffuser pipe is installed on the side wall of the housing. The input end of the diffuser pipe is connected to the air outlet of the housing. During operation, the motor drives the wheel disc to rotate. The wheel disc drives the plurality of front blades and the plurality of rear blades to rotate. Air enters the front part of the cavity through the air inlet of the housing. The rotating plurality of front blades accelerate the air at the first stage and push it towards the edge of the front part of the cavity of the housing. The diversion cavity diverts the air accelerated at the first stage towards the plurality of ventilation holes, so that the air accelerated at the first stage enters the rear part of the cavity of the housing through the plurality of ventilation holes. Since the plurality of rear blades are located outside the plurality of front blades, the linear velocity of the plurality of rear blades is greater than that of the front blades. Therefore, the rotating plurality of rear blades accelerate the air accelerated at the first stage at the second stage. The air accelerated at the second stage enters the diffuser pipe through the air outlet of the housing. The air accelerated at the second stage flows and is diffused and output in the diffuser pipe. By respectively providing a first-stage accelerating impeller and a second-stage accelerating impeller on the front end face and the rear end face of the wheel disc, the front and rear forces of the wheel disc are balanced when driving the air, so that the driving shaft and the bearing are balanced in force, reducing the friction of the bearing components of the impeller, thereby being more energy-saving, reducing the design difficulty of components such as the driving shaft and the bearing, improving the reliability of the centrifugal compressor, and realizing the second-stage acceleration of the air, improving the outlet air pressure.

[0007] Preferably, it further includes a plurality of short blades. The plurality of short blades are installed on the front end face of the wheel disc. The plurality of short blades are respectively located between the plurality of front blades. The length of the short blades is less than that of the front blades. Installing a plurality of shorter short blades between the plurality of front blades can improve the acceleration and compression efficiency of the air.

[0008] Preferably, the outer ends of the plurality of short blades and the outer ends of the plurality of front blades are on the same circumference.

[0009] Preferably, the inner ends of the plurality of short blades and the inner ends of the plurality of front blades are on the same circumference.

[0010] Preferably, it further includes a plurality of rounded corners. Rounded corners are provided between the plurality of front blades and the wheel disc. The rounded corners gradually thicken along the air flow direction and finally fill the corner area. By providing a plurality of rounded corners, the right-angle area formed between the front blades and the wheel disc can be reduced, effectively reducing corner separation and improving efficiency.

[0011] Preferably, it further includes a wind guide ring. The wind guide ring is concentrically and circumferentially installed on the front end face of the wheel disc. The wind guide ring is connected to the outer ends of the plurality of front blades. The outer edge of the wind guide ring and the diversion cavity form an air collection chamber. The wind guide ring guides the air forward and outward into the air collection chamber. The air that has been accelerated at the first stage by the plurality of front blades is guided forward and outward by the wind guide ring into the air collection chamber, so that the air accelerated at the first stage is more likely to enter the rear part of the cavity of the housing through the plurality of ventilation holes after gathering in the air collection chamber.

[0012] Preferably, it further includes a plurality of compressor blades. The plurality of compressor blades are circumferentially installed on the front end face of the wheel disc. The plurality of compressor blades are inclined. The plurality of compressor blades are located outside the wind guide ring and inside the diversion cavity. The wheel disc drives the plurality of compressor blades to rotate. The air compression effect of the inclined plurality of compressor blades pushes the air gathered in the air collection chamber backward through the plurality of ventilation holes, improving the efficiency of air backward delivery.

[0013] Preferably, it further includes a conical nut. The front end of the conical nut is conical. The conical nut is rotationally screwed to the end of the output shaft of the motor. The conical nut locks and installs the wheel disc on the output shaft of the motor. The conical front end of the conical nut guides and diverts the air entering the cavity of the housing to the surroundings, improving the air intake efficiency.

[0014] Preferably, it further includes a gate plate, an arm rod, and a push rod. The outer end of the gate plate is rotationally installed inside the input end of the diffuser pipe through a shaft rod. The inner end of the gate plate faces the air outlet of the housing. One end of the arm rod is connected to the outer end of the shaft rod of the gate plate. One end of the push rod is rotationally connected to the other end of the arm rod. The other end of the push rod is rotationally connected to the diffuser pipe. The telescopic movement of the piston rod of the push rod drives the gate plate to rotate through the arm rod, so that the gate plate opens and closes the input end of the diffuser pipe and can adjust the opening size of the diffuser pipe, realizing the adjustment of the air outlet flow rate, with good practicability.

[0015] Preferably, it further includes a gas supply pipe, a sleeve, a gear ring, a gas supply motor and a gear. An installation opening is provided at the center of the rear part of the housing. The gas supply pipe is concentrically installed in the installation opening of the housing. The inner end of the gas supply pipe is in sliding and sealing contact with the rear end face of the wheel disc. An air inlet hole II is provided on the side wall of the gas supply pipe, and a thread I is provided on the inner wall of the gas supply pipe. A thread II is provided on the outer wall of the sleeve. The sleeve is rotationally screwed in the gas supply pipe. The outer end of the sleeve is concentrically installed with the gear ring. The gear ring is located behind the gas supply pipe. The gas supply motor is installed on the rear side wall of the housing. A gear is concentrically installed on the output shaft of the gas supply motor. The gear meshes with the gear ring. The gas supply motor drives the gear to rotate. The gear meshes with the gear ring to drive the sleeve to rotate. The threads I and II between the sleeve and the gas supply pipe cause the sleeve to move back and forth along the axis of the gas supply pipe, so that the sleeve opens or closes the air inlet hole II of the gas supply pipe, and adjusts the opening size of the air inlet hole II, so that the outside air supplements air to the rear part of the cavity of the housing through the air inlet hole II of the gas supply pipe, realizing the adjustment of the air intake volume.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: During operation, the motor drives the wheel disc to rotate, and the wheel disc drives multiple front blades and multiple rear blades to rotate. Air enters the front part of the cavity through the air inlet hole of the housing. The rotating multiple front blades accelerate the air at the first stage and push it towards the edge of the front part of the cavity of the housing. The diversion cavity diverts the air accelerated at the first stage to multiple ventilation holes, so that the air accelerated at the first stage enters the rear part of the cavity of the housing through the multiple ventilation holes. Since the multiple rear blades are located outside the multiple front blades, the linear velocity of the multiple rear blades is greater than that of the front blades, so that the rotating multiple rear blades accelerate the air accelerated at the first stage at the second stage. The air accelerated at the second stage enters the diffuser pipe through the air outlet hole of the housing. The air accelerated at the second stage flows and expands in the diffuser pipe and is output after expansion. By respectively arranging a first-stage acceleration impeller and a second-stage acceleration impeller on the front end face and the rear end face of the wheel disc, the front and rear forces of the wheel disc are balanced when driving the air, so that the driving shaft and the bearing are balanced in force, reducing the friction of the bearing components of the impeller, thus being more energy-saving, reducing the design difficulty of components such as the driving shaft and the bearing, improving the reliability of the centrifugal compressor, and realizing the second-stage acceleration of the air, improving the outlet pressure. Brief Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the present invention;

[0018] Figure 2 is the front sectional structural schematic diagram of the present invention;

[0019] Figure 3 is the rear sectional structural schematic diagram of the present invention;

[0020] Figure 4 is the rear axonometric schematic diagram of the present invention;

[0021] Figure 5It is an isometric structure schematic diagram of the present invention;

[0022] Figure 6 is the schematic diagram of the rear isometric decomposition state structure of the present invention Figure 1 ;

[0023] Figure 7 is the schematic diagram of the rear isometric decomposition state structure of the present invention Figure 2 ;

[0024] Figure 8 is the isometric structure schematic diagram of the structures such as the wheel disc, front blade, ventilation hole, etc. in Embodiment 1;

[0025] Figure 9 is the front view structure schematic diagram of the structures such as the wheel disc, front blade, ventilation hole, etc. in Embodiment 1;

[0026] Figure 10 is the front view structure schematic diagram of the structures such as the wheel disc, front blade, ventilation hole, etc. in Embodiment 2;

[0027] Figure 11 is the structure schematic diagram of the structures such as the wheel disc, ventilation hole and rear blade, etc. of the present invention.

[0028] Reference signs in the drawings: 1, frame; 2, housing; 3, motor; 4, wheel disc; 5, front blade; 6, ventilation hole; 7, rear blade; 8, diversion cavity; 9, diffuser pipe; 10, short blade; 11, fillet; 12, air guide ring; 13, compressor blade; 14, conical nut; 15, gate plate; 16, arm rod; 17, push rod; 18, air supply pipe; 19, sleeve; 20, gear ring; 21, air supply motor; 22, gear. Detailed Embodiments

[0029] For ease of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention is thorough and complete.

[0030] Embodiment 1

[0031] As Figures 1 to 9 and Figure 11As shown in the figure, an energy-saving centrifugal compressor includes a frame 1, a housing 2, and a motor 3. The housing 2 and the motor 3 are installed on the frame 1. A cavity is provided inside the housing 2, and an air inlet hole communicating with the cavity is provided in the middle of the front end of the housing 2. It also includes a wheel disc 4, a plurality of front blades 5, a plurality of ventilation holes 6, a plurality of rear blades 7, a guide cavity 8, and a diffuser pipe 9. The wheel disc 4 is concentrically installed on the output shaft of the motor 3. The wheel disc 4 is located in the middle of the cavity of the housing 2. The wheel disc 4 divides the cavity of the housing 2 into a front part and a rear part. A plurality of front blades 5 are evenly installed circumferentially inside the front end face of the wheel disc 4. A plurality of ventilation holes 6 are provided circumferentially in the middle of the wheel disc 4. A plurality of rear blades 7 are evenly installed circumferentially on the outer circumference of the rear end face of the wheel disc 4. A plurality of ventilation holes 6 are arranged between the plurality of front blades 5 and the plurality of rear blades 7. A guide cavity 8 is provided at the front edge of the front part of the housing 2. The guide cavity 8 surrounds the outer edge of the plurality of ventilation holes 6. The guide cavity 8 guides the air flowing along the plurality of front blades 5 towards the plurality of ventilation holes 6. An air outlet hole is provided at the side edge of the housing 2. The air outlet hole communicates with the rear edge of the cavity of the housing 2. The diffuser pipe 9 is installed on the side wall of the housing 2. The input end of the diffuser pipe 9 is connected to the air outlet hole of the housing 2. It also includes a plurality of short blades 10. The plurality of short blades 10 are installed on the front end face of the wheel disc 4. The plurality of short blades 10 are respectively located between the plurality of front blades 5. The length of the short blades 10 is less than the length of the front blades 5. The outer ends of the plurality of short blades 10 and the outer ends of the plurality of front blades 5 are on the same circumference. It also includes a plurality of rounded corners 11. Rounded corners 11 are provided between the plurality of front blades 5 and the wheel disc 4. The rounded corners 11 gradually thicken along the air flow direction and finally fill the corner area. It also includes a guide vane ring 12. The guide vane ring 12 is concentrically installed circumferentially on the front end face of the wheel disc 4. The guide vane ring 12 is connected to the outer ends of the plurality of front blades 5. The outer edge of the guide vane ring 12 and the guide cavity 8 form a gas collecting chamber. The guide vane ring 12 guides the air forward and outward into the gas collecting chamber. It also includes a plurality of compressor blades 13. The plurality of compressor blades 13 are installed circumferentially on the front end face of the wheel disc 4. The plurality of compressor blades 13 are inclined. The plurality of compressor blades 13 are located outside the guide vane ring 12 and inside the guide cavity 8. It also includes a tapered nut 14. The front end of the tapered nut 14 is tapered. The tapered nut 14 is rotationally screwed onto the end of the output shaft of the motor 3. The tapered nut 14 locks and installs the wheel disc 4 on the output shaft of the motor 3.

[0032] During operation, the motor 3 drives the disk 4 to rotate. The disk 4 drives a plurality of front blades 5 and a plurality of rear blades 7 to rotate. Air enters the front part of the cavity through the air inlet holes of the housing 2. The conical front end of the conical nut 14 deflects the air entering the cavity of the housing 2 towards the surroundings. The rotating plurality of front blades 5 accelerate the air at the first stage and push it towards the edge of the front part of the cavity of the housing 2. The air accelerated at the first stage by the plurality of front blades 5 is deflected by the air guide ring 12 towards the front outer side and enters the air collecting chamber, so that the air accelerated at the first stage accumulates in the air collecting chamber. The diversion cavity 8 diverts the air accelerated at the first stage towards the plurality of ventilation holes 6. The disk 4 drives a plurality of air compression blades 13 to rotate. The air compression effect of the inclined plurality of air compression blades 13 pushes the air accumulated in the air collecting chamber backward through the plurality of ventilation holes 6, so that the air accelerated at the first stage enters the rear part of the cavity of the housing 2 through the plurality of ventilation holes 6. Since the plurality of rear blades 7 are located outside the plurality of front blades 5, the linear velocity of the plurality of rear blades 7 is greater than that of the front blades 5, so that the rotating plurality of rear blades 7 accelerate the air accelerated at the first stage at the second stage. The air accelerated at the second stage enters the diffuser duct 9 through the air outlet holes of the housing 2. The air accelerated at the second stage flows and is diffused and output in the diffuser duct 9. By respectively arranging a first-stage acceleration impeller and a second-stage acceleration impeller on the front end face and the rear end face of the disk 4, the forces on the front and rear of the disk 4 are balanced when driving the air, so that the forces on the driving shaft and the bearing are balanced, the friction of the bearing components of the impeller is reduced, thus being more energy-efficient, the design difficulty of components such as the driving shaft and the bearing is reduced, the reliability of the centrifugal compressor is improved, and the second-stage acceleration of the air is realized, and the outlet air pressure is increased.

[0033] By installing a plurality of shorter short blades 10 between the plurality of front blades 5, the acceleration and compression efficiency of the air is improved.

[0034] By providing a plurality of rounded corners 11 to reduce the right-angle area formed between the front blades 5 and the disk 4, the corner separation can be effectively reduced and the efficiency can be improved.

[0035] Embodiment 2

[0036] As Figures 1 to 7 、 Figure 10 and Figure 11 shown, different from Embodiment 1, the inner ends of the plurality of short blades 10 and the inner ends of the plurality of front blades 5 are on the same circumference.

[0037] Embodiment 3

[0038] As Figures 1 to 7As shown, on the basis of Embodiments 1 and 2, it further includes a gate plate 15, an arm rod 16, and a push rod 17. The outer end of the gate plate 15 is rotatably installed inside the input end of the diffuser pipe 9 through a shaft rod. The inner end of the gate plate 15 faces the air outlet hole of the housing 2. One end of the arm rod 16 is connected to the outer end of the shaft rod of the gate plate 15. One end of the push rod 17 is rotatably connected to the other end of the arm rod 16. The other end of the push rod 17 is rotatably connected to the diffuser pipe 9. It further includes a supplementary air pipe 18, a sleeve 19, a gear ring 20, a supplementary air motor 21, and a gear 22. An installation opening is provided at the center of the rear part of the housing 2. The supplementary air pipe 18 is concentrically installed in the installation opening of the housing 2. The inner end of the supplementary air pipe 18 is in sliding and sealing contact with the rear end face of the wheel disc 4. An air inlet hole II is provided on the side wall of the supplementary air pipe 18. A thread I is provided on the inner wall of the supplementary air pipe 18. A thread II is provided on the outer wall of the sleeve 19. The sleeve 19 is rotationally screwed into the supplementary air pipe 18. The outer end of the sleeve 19 is concentrically installed with the gear ring 20. The gear ring 20 is located behind the supplementary air pipe 18. The supplementary air motor 21 is installed on the rear side wall of the housing 2. The output shaft of the supplementary air motor 21 is concentrically installed with the gear 22. The gear 22 meshes with the gear ring 20.

[0039] The telescopic movement of the piston rod of the push rod 17 drives the gate plate 15 to rotate through the arm rod 16, so that the gate plate 15 opens and closes the input end of the diffuser pipe 9, and can adjust the opening size of the diffuser pipe 9, realizing the adjustment of the air outlet flow rate. The supplementary air motor 21 drives the gear 22 to rotate. The gear 22 meshes with the gear ring 20 to drive the sleeve 19 to rotate. The thread I and thread II between the sleeve 19 and the supplementary air pipe 18 enable the sleeve 19 to move back and forth along the axis of the supplementary air pipe 18, so that the sleeve 19 opens or closes the air inlet hole II of the supplementary air pipe 18, and adjusts the opening size of the air inlet hole II, so that the outside air supplements air to the rear part of the cavity of the housing 2 through the air inlet hole II of the supplementary air pipe 18, realizing the adjustment of the air intake volume.

[0040] As Figures 1 to 11As shown in the figure, in an energy-saving centrifugal compressor of the present invention, during operation, first, the motor 3 drives the wheel disc 4 to rotate. The wheel disc 4 drives a plurality of front blades 5, a plurality of rear blades 7, and a plurality of compressor blades 13 to rotate. Air enters the front part of the cavity through the air inlet hole of the housing 2. The rotating plurality of front blades 5 accelerate the air at the first stage and push it towards the edge of the front part of the cavity of the housing 2. Then, the air accelerated at the first stage is guided by the air guide ring 12 towards the front outer side and enters the air collecting chamber. The diversion cavity 8 diverts the air accelerated at the first stage towards the plurality of ventilation holes 6. The air compression effect of the inclined plurality of compressor blades 13 pushes the air accumulated in the air collecting chamber through the plurality of ventilation holes 6 backwards and into the rear part of the cavity of the housing 2. Then, since the plurality of rear blades 7 are located outside the plurality of front blades 5, the linear velocity of the plurality of rear blades 7 is greater than that of the front blades 5, so that the rotating plurality of rear blades 7 accelerate the air accelerated at the first stage at the second stage. The air accelerated at the second stage enters the diffuser duct 9 through the air outlet hole of the housing 2. At the same time, the air supplement motor 21 drives the gear 22 to rotate. The gear 22 meshes with the gear ring 20 to drive the sleeve 19 to rotate. The thread one and thread two between the sleeve 19 and the air supplement pipe 18 cause the sleeve 19 to move back and forth along the axis of the air supplement pipe 18, so that the sleeve 19 adjusts the opening size of the air inlet hole two of the air supplement pipe 18, and enables the outside air to supplement air to the rear part of the cavity of the housing 2 through the air inlet hole two of the air supplement pipe 18. Finally, the piston rod of the push rod 17 expands and contracts to drive the gate plate 15 to rotate to adjust the opening size of the diffuser duct 9, realizing the adjustment of the outlet air flow. The air accelerated at the second stage flows and is diffused and output in the diffuser duct 9.

[0041] The main functions achieved by the present invention are as follows:

[0042] 1. By respectively arranging a first-stage acceleration impeller and a second-stage acceleration impeller on the front end face and the rear end face of the wheel disc 4, the forces on the front and rear of the wheel disc 4 are balanced, so that the driving shaft and the bearings are under balanced forces, reducing the friction of the bearing components of the impeller and improving the reliability of the centrifugal compressor;

[0043] 2. Reducing the friction of the bearing components of the impeller, making it more energy-saving;

[0044] 3. Adopting two-stage acceleration of air, increasing the outlet air pressure;

[0045] 4. Being able to adjust the outlet size;

[0046] 5. Having an air supplement function, improving the flexibility of air intake;

[0047] 6. Designing rounded corners with increased thickness along the flow direction components, finally filling the corner area, which can effectively reduce corner separation and improve efficiency;

[0048] 7. Adopting a design of one long and one short blade to improve the air compression efficiency.

[0049] An energy-saving centrifugal compressor of the present invention has a common mechanical installation method, connection method or setting method, and any implementation that can achieve its beneficial effects is acceptable; the frame 1, housing 2, motor 3, wheel disc 4, front blade 5, rear blade 7, diffuser pipe 9, short blade 10, compression blade 13, conical nut 14, push rod 17, gear ring 20, air supplement motor 21, and gear 22 of the energy-saving centrifugal compressor of the present invention are purchased on the market, and technicians in this industry only need to install and operate according to the attached operation manual, without the need for technicians in this field to perform creative labor.

[0050] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An energy-saving centrifugal compressor, comprising a frame (1), a housing (2) and a motor (3). The housing (2) and the motor (3) are installed on the frame (1). A cavity is provided inside the housing (2), and an air inlet hole communicating with the cavity is provided in the middle of the front end of the housing (2). It is characterized in that, It further includes a roulette wheel (4), a plurality of front blades (5), a plurality of ventilation holes (6), a plurality of rear blades (7), a diversion cavity (8) and a diffuser duct (9). The roulette wheel (4) is concentrically installed on the output shaft of the motor (3). The roulette wheel (4) is located in the middle of the cavity of the housing (2). The roulette wheel (4) divides the cavity of the housing (2) into a front part and a rear part. A plurality of front blades (5) are evenly installed circumferentially inside the front end face of the roulette wheel (4). A plurality of ventilation holes (6) are arranged circumferentially in the middle of the roulette wheel (4). A plurality of rear blades (7) are evenly installed on the outer circumference of the rear end face of the roulette wheel (4). A plurality of ventilation holes (6) are arranged between the plurality of front blades (5) and the plurality of rear blades (7). A diversion cavity (8) is arranged at the front edge of the front part of the housing (2). The diversion cavity (8) surrounds the outer edge of the plurality of ventilation holes (6). An air outlet is arranged on the side edge of the housing (2). The air outlet is communicated with the rear edge of the cavity of the housing (2). The diffuser duct (9) is installed on the side wall of the housing (2). The input end of the diffuser duct (9) is connected to the air outlet of the housing (2); It further includes a supplementary air pipe (18), a sleeve (19), a gear ring (20), a supplementary air motor (21) and a gear (22). An installation opening is arranged at the center of the rear part of the housing (2). The supplementary air pipe (18) is concentrically installed in the installation opening of the housing (2). The inner end of the supplementary air pipe (18) is in sliding and sealing contact with the rear end face of the roulette wheel (4). An air inlet hole II is arranged on the side wall of the supplementary air pipe (18). A thread I is arranged on the inner wall of the supplementary air pipe (18). A thread II is arranged on the outer wall of the sleeve (19). The sleeve (19) is rotationally screwed in the supplementary air pipe (18). The outer end of the sleeve (19) is concentrically installed with the gear ring (20). The gear ring (20) is located behind the supplementary air pipe (18). The supplementary air motor (21) is installed on the rear side wall of the housing (2). The output shaft of the supplementary air motor (21) is concentrically installed with the gear (22). The gear (22) meshes with the gear ring (20); During operation, the motor (3) drives the roulette wheel (4) to rotate. The roulette wheel (4) drives the plurality of front blades (5) and the plurality of rear blades (7) to rotate. Air enters the front part of the cavity through the air inlet hole of the housing (2). The rotating plurality of front blades (5) accelerate the air at the first stage and push it towards the edge of the front part of the cavity of the housing (2). The diversion cavity (8) diverts the air accelerated at the first stage towards the plurality of ventilation holes, so that the air accelerated at the first stage enters the rear part of the cavity of the housing (2) through the plurality of ventilation holes. Since the plurality of rear blades (7) are located outside the plurality of front blades (5), the linear velocity of the plurality of rear blades (7) is greater than that of the front blades (5). Thus, the rotating plurality of rear blades (7) accelerate the air accelerated at the first stage at the second stage. The air accelerated at the second stage enters the diffuser duct (9) through the air outlet of the housing (2).

2. The energy-saving centrifugal compressor according to claim 1, wherein, It further includes a plurality of short blades (10). The plurality of short blades (10) are installed on the front end face of the roulette wheel (4). The plurality of short blades (10) are respectively located between the plurality of front blades (5). The length of the short blades (10) is less than that of the front blades (5).

3. The energy-saving centrifugal compressor according to claim 2, wherein The outer ends of the plurality of short blades (10) and the outer ends of the plurality of front blades (5) are on the same circumference.

4. The energy-saving centrifugal compressor according to claim 2, characterized in that, The inner ends of the multiple short blades (10) are on the same circumference as the inner ends of the multiple front blades (5).

5. An energy-saving centrifugal compressor according to claim 1, characterized in that, It further includes multiple fillets (11). Fillets (11) are arranged between the multiple front blades (5) and the wheel disc (4). The fillets (11) gradually thicken along the air flow direction and finally fill the corner area.

6. The energy-saving centrifugal compressor according to claim 1, wherein, It further includes a guide vane ring (12). The guide vane ring (12) is concentrically and circumferentially installed on the front end face of the wheel disc (4). The guide vane ring (12) is connected to the outer ends of the multiple front blades (5). The outer edge of the guide vane ring (12) and the diversion cavity (8) form a plenum chamber. The guide vane ring (12) guides the air forward and outward into the plenum chamber.

7. The energy-saving centrifugal compressor according to claim 6, characterized in that, It further includes multiple compressor blades (13). The multiple compressor blades (13) are circumferentially installed on the front end face of the wheel disc (4). The multiple compressor blades (13) are inclined. The multiple compressor blades (13) are located outside the guide vane ring (12) and inside the diversion cavity (8).

8. An energy-saving centrifugal compressor according to claim 1, characterized in that, It further includes a tapered nut (14). The front end of the tapered nut (14) is tapered. The tapered nut (14) is rotationally screwed to the end of the output shaft of the motor (3). The tapered nut (14) locks and installs the wheel disc (4) on the output shaft of the motor (3).

9. The energy-saving centrifugal compressor according to claim 1, characterized in that, It further includes a shutter (15), a lever (16) and a push rod (17). The outer end of the shutter (15) is rotationally installed inside the input end of the diffuser duct (9) through a shaft rod. The inner end of the shutter (15) faces the air outlet of the housing (2). One end of the lever (16) is connected to the outer end of the shaft rod of the shutter (15). One end of the push rod (17) is rotationally connected to the other end of the lever (16). The other end of the push rod (17) is rotationally connected to the diffuser duct (9).

Images