Four-stage Compression High-efficiency and Energy-saving Centrifugal Compressor

Abstract

The present invention discloses a four-stage compression high-efficiency and energy-saving centrifugal compressor, which relates to the technical field of centrifugal compressors and includes: a frame, the inner side of the frame is fixedly connected with a housing, an air outlet pipe is installed at the air outlet of the housing, an air inlet pipe is installed at the air inlet of the housing, four installation grooves and four diffuser grooves are formed inside the housing, and the air inlet pipe communicates with the diffuser grooves. An impeller adjustment mechanism is arranged inside the diffuser grooves, and an angle adjustment mechanism is arranged inside the installation grooves; by setting the impeller adjustment mechanism to drive a plurality of blades to rotate, the angle of the blades is reduced, thereby reducing the centrifugal force of the air flow. At the same time, the cross-sectional area of the air flow channel is reduced, thereby reducing the gas flow rate entering the impeller, and further reducing the compression ratio of the gas, thereby improving the compression efficiency of the device for the gas, reducing energy loss, and thus improving the overall practicality of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal compressors, and specifically to a four-stage compression high-efficiency and energy-saving centrifugal compressor. Background Art

[0002] A four-stage compression high-efficiency and energy-saving centrifugal compressor compresses gas. When it is necessary to change the compression ratio of air, the rotational speed of the fan blades needs to be adjusted to change the compression amplitude of air. The existing impeller outlet air flow angle of the centrifugal compressor is matched with the diffuser groove inlet angle, and the air flow can smoothly enter the diffuser groove for diffusion. When the rotational speed decreases, the rotational speed of the impeller slows down, the centrifugal force obtained by the gas in the impeller decreases, resulting in a change in the impeller outlet air flow angle, which is no longer matched with the diffuser groove inlet angle. This causes the air flow to generate impact and turbulence when entering the diffuser groove, increasing the flow loss and thus reducing the efficiency of the diffuser groove. For this reason, we designed a four-stage compression high-efficiency and energy-saving centrifugal compressor to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to: solve the problem that when the rotational speed of the impeller decreases, the impeller outlet air flow angle deviates, resulting in a change in the impeller outlet air flow angle, which is no longer matched with the diffuser groove inlet angle, so that the air flow generates impact and turbulence when entering the diffuser groove, increasing the flow loss and thus reducing the efficiency of the diffuser groove, and provide a four-stage compression high-efficiency and energy-saving centrifugal compressor.

[0004] To achieve the above purpose, the present invention provides the following technical solution: a four-stage compression high-efficiency and energy-saving centrifugal compressor, including: a frame, a housing is fixedly connected to the inside of the frame, an air outlet pipe is installed at the air outlet of the housing, an air inlet pipe is installed at the air inlet of the housing, four installation grooves and four diffuser grooves are opened inside the housing, and the air inlet pipe communicates with the diffuser grooves. An impeller adjustment mechanism is arranged inside the diffuser grooves, and an angle adjustment mechanism is arranged inside the installation grooves; the impeller adjustment mechanism includes a connecting part fixedly connected to the inside of the diffuser grooves, a first rectangular groove is opened inside the connecting part, a first driving motor is installed inside the first rectangular groove, the output end of the first driving motor penetrates to the outside of the connecting part and is fixedly connected to a blade disc, a plurality of fixing seats are fixedly connected to the outer wall of the blade disc, a rotating shaft is rotatably connected to the inside of each of the plurality of fixing seats, the rotating shaft penetrates to the bottom of the fixing seat and is fixedly connected to a rotating seat, and an elastic rubber is fixedly connected between every two rotating seats, and a blade is fixedly connected to the top of the rotating seat.

[0005] As a further solution of the present invention: The impeller adjustment mechanism further includes a ring rotatably connected to the top of the fixed seat. A plurality of first teeth are fixedly connected to the outer wall of the ring. The rotating shaft penetrates to the top of the fixed seat and is fixedly connected with a first spur gear, and the first spur gear meshes with the first teeth. A driving component is arranged inside the impeller disc 11.

[0006] As a further solution of the present invention: The driving component includes a second rectangular groove opened inside the impeller disc. A second driving motor is installed inside the second rectangular groove. The output end of the second driving motor is fixedly connected with a first connecting shaft. The first connecting shaft penetrates to the top of the impeller disc and is fixedly connected with a second spur gear. A plurality of second teeth are fixedly connected to the inside of the ring, and the second teeth mesh with the second spur gear.

[0007] As a further solution of the present invention: The angle adjustment mechanism includes four connecting bins fixedly connected inside the four installation grooves. The inside of one connecting bin communicates with the intake pipe, and the inside of the other three connecting bins communicates with the diffuser groove. A plurality of first connecting pipes are installed at the exhaust port at one end of the connecting bin, and one end of each of the plurality of first connecting pipes is fixedly connected with a corrugated pipe. One end of the corrugated pipe is fixedly connected with a second connecting pipe. A rotating disc is rotatably connected inside the installation groove, and a plurality of circular holes with the same inner diameter as that of the inside of the first connecting pipe are opened inside the rotating disc.

[0008] As a further solution of the present invention: The angle adjustment mechanism further includes a third driving motor installed at one end of the connecting bin. The output end of the third driving motor is fixedly connected with a second connecting shaft, and the second connecting shaft is fixedly connected with the rotating disc. A diameter transformation component is arranged between the second connecting pipe and the rotating disc.

[0009] As a further solution of the present invention: The diameter transformation component includes a first circular plate rotatably connected to one side of the second connecting pipe. A plurality of arc grooves are opened inside the first circular plate, and a limiting post is slidably connected inside each of the plurality of arc grooves. The bottom of the limiting post is fixedly connected with a movable piece. A second circular plate is fixedly connected to one side of the rotating disc. A plurality of limiting chutes with the same number as that of the limiting posts are opened inside the second circular plate, and the movable piece is slidably connected inside the limiting chute.

[0010] As a further embodiment of the present invention: The diameter transformation assembly further includes an annular gear fixedly connected to the outer wall of the first circular plate. One side of the rotating disc is slidably connected to a straight rack, and the straight rack meshes with the annular gear. One end of the straight rack is fixedly connected to a fixing plate, a return spring is installed between the fixing plate and the rotating disc, and a synchronous driving unit is provided at one end of the straight rack.

[0011] As a further embodiment of the present invention: The synchronous driving unit includes a connecting bar fixedly connected to one side of the straight rack. One end of the connecting bar is rotatably connected to a rotating wheel. A driving plate is fixedly connected to the inner side of the installation groove. An inclined surface is provided on one side of the driving plate, and the rotating wheel abuts against the inclined surface.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. By setting the impeller adjustment mechanism, multiple first spur gears are driven to rotate synchronously, so that multiple rotating seats rotate in the clockwise direction, thereby driving multiple blades to rotate, reducing the angle of the blades, reducing the centrifugal force of the airflow, reducing the single-stage pressure ratio. At the same time, the reduction of the blade angle reduces the cross-sectional area of the airflow channel formed between adjacent blades, so that the gas flow rate entering the impeller decreases, further reducing the compression ratio of the gas and reducing energy loss. After the blade angle is reduced, the flow state of the airflow in the impeller changes, enabling the outlet airflow angle of the impeller to better match the inlet angle of the diffuser groove. In this way, the airflow can enter the diffuser groove more smoothly, reducing the generation of impact and turbulence, thereby reducing the flow loss and improving the efficiency of the diffuser groove;

[0014] 2. By setting the angle adjustment mechanism, the rotating disc is driven to rotate, thereby driving the second connecting pipe to rotate, so that the first connecting pipe, the corrugated pipe and the second connecting pipe are in an obliquely inclined state, changing the angle of gas flow, enabling the gas to conform to the rotation direction of the blades, reducing the work demand of the blades, thereby reducing the impact loss at the blade inlet and improving the utilization rate of energy;

[0015] 3. By setting up a diameter transformation component, the diameter of the channel formed by multiple movable pieces is reduced, thus accurately reducing the intake air volume inside the installation groove, providing a more stable basic condition for subsequent compression ratio adjustment, avoiding the problem of unstable compression effect caused by excessive intake air volume fluctuations. At the same time, in cooperation with the clockwise rotation of multiple rotating seats and the change of the gas flow direction by the rotating disc, a multi-dimensional compression ratio adjustment mechanism is formed, which can adjust the compression ratio more flexibly and accurately according to the actual working conditions, reduce unnecessary energy consumption, improve the compression efficiency of the device for gas, enable the device to maintain good performance under different working conditions, expand its applicable range, and thus improve the overall practicality of the device. Brief Description of the Drawings

[0016] Figure 1 is a structural schematic diagram of the present invention;

[0017] Figure 2 is a cross-sectional view of the present invention;

[0018] Figure 3 is a structural schematic diagram of the housing of the present invention;

[0019] Figure 4 is a cross-sectional view of the impeller adjustment mechanism of the present invention;

[0020] Figure 5 is a structural schematic diagram of the connection part of the present invention;

[0021] Figure 6 is a structural schematic diagram of the blade disc of the present invention;

[0022] Figure 7 is a structural schematic diagram of the fixed seat of the present invention;

[0023] Figure 8 is a partial structural schematic diagram of the impeller adjustment mechanism of the present invention;

[0024] Figure 9 of the present invention Figure 8 Enlarged view at A;

[0025] Figure 10 is an exploded view of parts such as the rotating seat, elastic rubber and blade disc of the present invention;

[0026] Figure 11 is a cross-sectional view of the angle adjustment mechanism of the present invention;

[0027] Figure 12 of the present invention Figure 11 Enlarged view at B;

[0028] Figure 13 is a partial structural schematic diagram of the diameter transformation component of the present invention;

[0029] Figure 14 This is an exploded view of parts such as the first circular plate, movable piece, and second circular plate of the present invention.

[0030] In the figure: 1, frame; 2, housing; 3, air outlet pipe; 4, air inlet pipe; 5, diffuser groove; 6, connecting part; 7, mounting groove; 8, first rectangular groove; 9, first driving motor; 10, return spring; 11, impeller disc; 12, rotating seat; 13, blade; 14, fixed seat; 15, rotating shaft; 16, first spur gear; 17, ring; 18, first tooth; 19, second tooth; 20, second rectangular groove; 21, second driving motor; 22, first connecting shaft; 23, second spur gear; 24, elastic rubber; 25, protective shell; 26, connecting bin; 27, rotating disc; 28, first connecting pipe; 29, bellows; 30, second connecting pipe; 31, first circular plate; 32, annular gear; 33, arc groove; 34, movable piece; 35, limit post; 36, second circular plate; 37, limit sliding groove; 38, round hole; 39, driving plate; 40, straight rack; 41, connecting bar; 42, rotating wheel; 43, third driving motor; 44, second connecting shaft; 45, inclined plane; 46, fixing plate. Detailed implementation mode

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. The following will describe the embodiments according to the overall structure of the present invention.

[0033] Please refer to Figures 1 to 14, this embodiment provides a four-stage compression high-efficiency and energy-saving centrifugal compressor, including: a frame 1, a housing 2 is fixedly connected to the inner side of the frame 1, an air outlet pipe 3 is installed at the air outlet of the housing 2, an air inlet pipe 4 is installed at the air inlet of the housing 2, four installation grooves 7 and four diffuser grooves 5 are formed inside the housing 2, and the air inlet pipe 4 communicates with the diffuser groove 5. An impeller adjustment mechanism is arranged inside the diffuser groove 5, and an angle adjustment mechanism is arranged inside the installation groove 7; The impeller adjustment mechanism includes a connecting part 6 fixedly connected to the inside of the diffuser groove 5. A first rectangular groove 8 is formed inside the connecting part 6. A first driving motor 9 is installed inside the first rectangular groove 8. The output end of the first driving motor 9 penetrates to the outside of the connecting part 6 and is fixedly connected to an impeller disc 11. A plurality of fixing seats 14 are fixedly connected to the outer wall of the impeller disc 11. A rotating shaft 15 is rotatably connected to the inside of each of the plurality of fixing seats 14. The rotating shaft 15 penetrates to the bottom of the fixing seat 14 and is fixedly connected to a rotating seat 12. An elastic rubber 24 is fixedly connected between every two rotating seats 12. A blade 13 is fixedly connected to the top of the rotating seat 12; The impeller adjustment mechanism further includes a ring 17 rotatably connected to the top of the fixing seat 14. A plurality of first teeth 18 are fixedly connected to the outer wall of the ring 17. The rotating shaft 15 penetrates to the top of the fixing seat 14 and is fixedly connected to a first spur gear 16, and the first spur gear 16 meshes with the first teeth 18. A driving component is arranged inside the impeller disc 11; The driving component includes a second rectangular groove 20 formed inside the impeller disc 11. A second driving motor 21 is installed inside the second rectangular groove 20. The output end of the second driving motor 21 is fixedly connected to a first connecting shaft 22. The first connecting shaft 22 penetrates to the top of the impeller disc 11 and is fixedly connected to a second spur gear 23. A plurality of second teeth 19 are fixedly connected to the inside of the ring 17, and the second teeth 19 mesh with the second spur gear 23.

[0034] The diameter inside the diffuser groove 5 gradually increases from the input end to the output end (the diameter at the output end increases to 1.5 - 1.8 times the diameter at the output end). The first driving motor 9 is controlled by a PLC controller, and the first driving motor 9 can be controlled to start intermittently. The air inlet pipe 4 is connected to an external air supply pipe. When the external air supply pipe supplies air to the air inlet pipe 4, the PLC controller controls the first driving motor 9 to start, thereby driving the impeller disc 11 to rotate, and then driving the blades 13 to rotate, so as to push the gas on one side of the impeller disc 11 into the inside of the diffuser groove 5. Inside the diffuser groove 5, since the diameter of the pipe inside gradually increases, the gas flow rate gradually decreases, thereby compressing the gas, and then repeating this operation to compress the gas multiple times to achieve efficient compression of the gas.

[0035] The impeller is composed of parts such as a disk 11, a rotating seat 12, and blades 13. The second drive motor 21 is controlled by a PLC controller and can be controlled to start intermittently. When the blades 13 compress the gas and it is necessary to reduce the compression ratio of the gas, at this time, the PLC controller controls the second drive motor 21 to start, thereby driving the second spur gear 23 to rotate, thus driving the second engaging tooth 19 to rotate, thereby driving the ring 17 to rotate, thereby driving the first engaging tooth 18 to rotate, thus driving multiple first spur gears 16 to rotate synchronously, thereby causing multiple rotating seats 12 to rotate clockwise, thus driving multiple blades 13 to rotate, thereby reducing the angle of the blades 13, thereby reducing the centrifugal force of the airflow and reducing the single-stage compression ratio. At the same time, the reduction of the angle of the blades 13 causes the cross-sectional area of the airflow channel formed between adjacent blades 13 to shrink, thereby reducing the gas flow rate entering the impeller, thereby further reducing the compression ratio of the gas and reducing energy loss. After the angle of the blades 13 is reduced, the flow state of the airflow in the impeller changes, enabling the outlet airflow angle of the impeller to better match the inlet angle of the diffuser groove 5. In this way, the airflow can enter the diffuser groove 5 more smoothly, reducing the generation of impact and turbulence, thereby reducing the flow loss and improving the efficiency of the diffuser groove 5.

[0036] The newly designed impeller adjustment mechanism can flexibly adjust the compression ratio without relying on a significant reduction in speed, reduce energy loss and improve compression efficiency. This enables the device to maintain good performance under different operating conditions, enhancing the adaptability and stability of the device, thereby improving the overall practicality of the device.

[0037] The elastic rubber 24 is composed of flexible rubber and can be stretched to an appropriate extent. When multiple rotating seats 12 rotate synchronously, at this time, the elastic rubber 24 rotates synchronously with the rotating seats 12, thereby enabling the two ends of the elastic rubber 24 to be pulled synchronously, so that a sealed state is always maintained between multiple rotating seats 12, without gaps occurring as the rotating seats 12 rotate, thereby preventing gas from flowing out, thereby improving the overall stability of the device, and thereby improving the overall practicality of the device.

[0038] Please refer to Figures 4 to 14, the angle adjustment mechanism includes four connection chambers 26 fixedly connected to the inner sides of the four mounting grooves 7. The inner side of one connection chamber 26 communicates with the intake pipe 4, and the inner sides of the other three connection chambers 26 communicate with the diffuser groove 5. A plurality of first connection pipes 28 are installed at the exhaust port at one end of the connection chamber 26, and one end of each of the plurality of first connection pipes 28 is fixedly connected to a bellows 29. One end of the bellows 29 is fixedly connected to a second connection pipe 30. A rotating disk 27 is rotatably connected to the inner side of the mounting groove 7, and a plurality of circular holes 38 having the same inner diameter as that of the first connection pipe 28 are formed in the inner side of the rotating disk 27. The angle adjustment mechanism further includes a third driving motor 43 installed at one end of the connection chamber 26. The output end of the third driving motor 43 is fixedly connected to a second connection shaft 44, and the second connection shaft 44 is fixedly connected to the rotating disk 27. A diameter transformation component is provided between the second connection pipe 30 and the rotating disk 27. The diameter transformation component includes a first circular plate 31 rotatably connected to one side of the second connection pipe 30. A plurality of arc-shaped grooves 33 are formed in the inner side of the first circular plate 31, and a limiting post 35 is slidably connected to the inner side of each of the plurality of arc-shaped grooves 33. The bottom of the limiting post 35 is fixedly connected to a movable piece 34. A second circular plate 36 is fixedly connected to one side of the rotating disk 27. A plurality of limiting sliding grooves 37 having the same number as the limiting posts 35 are formed in the inner side of the second circular plate 36, and the movable piece 34 is slidably connected to the inner side of the limiting sliding groove 37. The diameter transformation component further includes an annular gear 32 fixedly connected to the outer wall of the first circular plate 31. A straight rack 40 is slidably connected to one side of the rotating disk 27, and the straight rack 40 meshes with the annular gear 32. One end of the straight rack 40 is fixedly connected to a fixing plate 46. A return spring 10 is installed between the fixing plate 46 and the rotating disk 27. A synchronous driving unit is provided at one end of the straight rack 40. The synchronous driving unit includes a connecting bar 41 fixedly connected to one side of the straight rack 40. One end of the connecting bar 41 is rotatably connected to a rotating wheel 42. A driving plate 39 is fixedly connected to the inner side of the mounting groove 7. An inclined surface 45 is formed on one side of the driving plate 39, and the rotating wheel 42 abuts against the inclined surface 45.

[0039] The third driving motor 43 is controlled by a PLC controller, and the third driving motor 43 can be controlled to start intermittently. When the plurality of rotating seats 12 rotate in the clockwise direction, at this time, the PLC controller controls the third driving motor 43 to start, so as to drive the second connection shaft 44 to rotate in the clockwise direction, thereby driving the rotating disk 27 to rotate, thereby driving the second connection pipe 30 to rotate, so that the first connection pipe 28, the bellows 29, and the second connection pipe 30 are in an obliquely inclined state, thereby changing the angle of gas flow, so that the gas can conform to the rotation direction of the blade 13, reducing the work demand of the blade 13, thereby reducing the inlet impact loss of the blade 13, and thus improving the energy utilization rate.

[0040] When the rotating disk 27 rotates, it drives the straight rack 40 to rotate. Thus, under the action of the inclined plane 45, the rotating wheel 42 is driven to move towards the direction of the second connecting shaft 44, driving the straight rack 40 to move accordingly, and then driving the annular gear 32 to rotate clockwise, which drives the first circular plate 31 to rotate. Driving the first circular plate 31 to rotate, under the action of the arc-shaped groove 33, multiple movable pieces 34 are respectively driven to move along the inner side of the limiting sliding groove 37, causing the multiple movable pieces 34 to tighten inward. In this way, the diameter of the channel formed by the multiple movable pieces 34 is reduced, precisely reducing the intake air volume inside the installation groove 7, providing a more stable basic condition for subsequent compression ratio adjustment, avoiding the problem of unstable compression effect caused by excessive intake air volume fluctuations. At the same time, in cooperation with the clockwise rotation of multiple rotating seats 12 and the change of the gas flow direction by the rotating disk 27, a multi-dimensional compression ratio adjustment mechanism is formed, which can adjust the compression ratio more flexibly and precisely according to the actual working conditions, reduce unnecessary energy consumption, improve the compression efficiency of the device for gas, enable the device to maintain good performance under different working conditions, expand its applicable range, and thus improve the overall practicality of the device.

[0041] When it is necessary to increase the compression ratio of the device, the PLC controller can control the start of the second driving motor 21 at this time. When driving multiple rotating seats 12 to rotate counterclockwise, the PLC controller can control the second connecting shaft 44 to rotate counterclockwise at this time, causing multiple blades 13 to rotate in the opposite direction, increasing the angle of the blades 13, increasing the inlet flow rate. At the same time, the PLC controller can control the second connecting pipe 30 to rotate in the opposite direction, making the first connecting pipe 28, the corrugated pipe 29, and the second connecting pipe 30 in a reverse inclined state, changing the angle of gas flow, so that the gas can flow against the rotation direction of the blades 13, increasing the work capacity of the blades 13, thus increasing the compression ratio of the device for gas. At the same time, the multiple movable pieces 34 open outward, increasing the diameter of the channel formed by the multiple movable pieces 34, increasing the intake air volume inside the installation groove 7, further increasing the compression ratio of the device, and thus improving the overall practicality of the device.

[0042] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. Four - stage compression high - efficiency and energy - saving centrifugal compressor, characterized in that, Including: A frame (1), a housing (2) is fixedly connected to the inner side of the frame (1), an air outlet pipe (3) is installed at the air outlet of the housing (2), an air inlet pipe (4) is installed at the air inlet of the housing (2), four installation grooves (7) and four diffuser grooves (5) are formed in the inner side of the housing (2), and the air inlet pipe (4) communicates with the diffuser grooves (5). An impeller adjustment mechanism is arranged inside the diffuser grooves (5), and an angle adjustment mechanism is arranged inside the installation grooves (7); The impeller adjustment mechanism includes a connecting part (6) fixedly connected to the inner side of the diffuser groove (5). A first rectangular groove (8) is formed in the inner side of the connecting part (6). A first driving motor (9) is installed in the first rectangular groove (8). The output end of the first driving motor (9) penetrates to the outside of the connecting part (6) and is fixedly connected with a blade disc (11). A plurality of fixing seats (14) are fixedly connected to the outer wall of the blade disc (11). A rotating shaft (15) is rotatably connected to the inside of each of the plurality of fixing seats (14). The rotating shaft (15) penetrates to the bottom of the fixing seat (14) and is fixedly connected with a rotating seat (12). An elastic rubber (24) is fixedly connected between every two rotating seats (12). A blade (13) is fixedly connected to the top of the rotating seat (12); The impeller adjustment mechanism further includes a ring (17) rotatably connected to the top of the fixing seat (14). A plurality of first teeth (18) are fixedly connected to the outer wall of the ring (17). The rotating shaft (15) penetrates to the top of the fixing seat (14) and is fixedly connected with a first spur gear (16), and the first spur gear (16) meshes with the first teeth (18). A driving component is arranged inside the blade disc (11); The driving component includes a second rectangular groove (20) formed in the inner side of the blade disc (11). A second driving motor (21) is installed in the second rectangular groove (20). The output end of the second driving motor (21) is fixedly connected with a first connecting shaft (22). The first connecting shaft (22) penetrates to the top of the blade disc (11) and is fixedly connected with a second spur gear (23). A plurality of second teeth (19) are fixedly connected to the inner side of the ring (17), and the second teeth (19) mesh with the second spur gear (23); The angle adjustment mechanism includes four connection bins (26) fixedly connected to the inner sides of the four installation slots (7), and the inner side of one of the connection bins (26) communicates with the intake pipe (4), while the inner sides of the other three connection bins (26) communicate with the diffuser slot (5). A plurality of first connection pipes (28) are installed at the exhaust ports at one ends of the connection bins (26), and one ends of the plurality of first connection pipes (28) are fixedly connected to bellows (29). One end of the bellows (29) is fixedly connected to a second connection pipe (30). A rotating disk (27) is rotatably connected to the inner side of the installation slot (7), and a plurality of circular holes (38) with the same inner diameter as that of the first connection pipes (28) are formed in the inner side of the rotating disk (27).

2. The four-stage compression high-efficiency energy-saving centrifugal compressor according to claim 1, wherein, The angle adjustment mechanism further includes a third driving motor (43) installed at one end of the connection bin (26). The output end of the third driving motor (43) is fixedly connected to a second connection shaft (44), and the second connection shaft (44) is fixedly connected to the rotating disk (27). A diameter transformation component is arranged between the second connection pipe (30) and the rotating disk (27).

3. The four-stage compression high-efficiency and energy-saving centrifugal compressor according to claim 2, characterized in that, The diameter transformation component includes a first circular plate (31) rotatably connected to one side of the second connection pipe (30). A plurality of arc-shaped grooves (33) are formed in the inner side of the first circular plate (31), and a limiting post (35) is slidably connected to the inner sides of the plurality of arc-shaped grooves (33). The bottom of the limiting post (35) is fixedly connected to a movable piece (34). A second circular plate (36) is fixedly connected to one side of the rotating disk (27). A plurality of limiting sliding grooves (37) with the same number as that of the limiting posts (35) are formed in the inner side of the second circular plate (36), and the movable piece (34) is slidably connected to the inner side of the limiting sliding groove (37).

4. The four-stage compression high-efficiency and energy-saving centrifugal compressor according to claim 3, wherein, The diameter transformation component further includes an annular gear (32) fixedly connected to the outer wall of the first circular plate (31). A straight rack (40) is slidably connected to one side of the rotating disk (27), and the straight rack (40) meshes with the annular gear (32). One end of the straight rack (40) is fixedly connected to a fixing plate (46). A return spring (10) is installed between the fixing plate (46) and the rotating disk (27). A synchronous driving unit is arranged at one end of the straight rack (40).

5. The four-stage compression high-efficiency and energy-saving centrifugal compressor according to claim 4, wherein The synchronous driving unit includes a connection bar (41) fixedly connected to one side of the straight rack (40). One end of the connection bar (41) is rotatably connected to a rotating wheel (42). A driving plate (39) is fixedly connected to the inner side of the installation slot (7). An inclined surface (45) is formed on one side of the driving plate (39), and the rotating wheel (42) abuts against the inclined surface (45).

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