Gas compressor with width-adjustable diffuser

Abstract

The utility model provides a diffuser width adjustable compressor, including casing main part, impeller and pneumatic actuating mechanism, casing main part includes mount, pressure shell, diffuser plate and back plate, back plate is fixed connection on pressure shell, diffuser plate is in sliding connection on back plate and is close to the side of pressure shell, the pressure shell is equipped with air inlet and air outlet, the air inlet is equipped with air inlet and air outlet, the air inlet is equipped with air inlet and air outlet, the air inlet is equipped with air inlet and air outlet, the air outlet is equipped with air inlet and air outlet. The impeller is rotationally connected in the pressure shell, and the back plate, the pressure shell and the diffusion plate are fixedly connected to the fixing frame through the back plate; a diffusion gap is formed between the diffusion plate and the pressure shell; the pneumatic executing mechanism is installed on the fixing frame, the output end of the pneumatic executing mechanism is connected with the diffusion plate, an air pipe is led out of an air outlet of the pressing shell, and the end, away from the pressing shell, of the air pipe is communicated with the pneumatic executing mechanism so that the pneumatic executing mechanism can drive the back plate to slide to be close to or away from the pressing shell to adjust the diffusion gap. Through the arrangement of the driving execution mechanism and the air pipe, automatic adjustment of the diffusion gap is achieved.

Description

Technical Field

[0001] This utility model relates to the field of turbocharger technology, specifically to a compressor with adjustable diffuser width. Background Technology

[0002] In recent years, with the upgrading of engine emission standards, the performance requirements for turbochargers have become increasingly stringent. Automotive engines, in particular, place greater emphasis on low-speed, high-torque performance and good fuel economy, which imposes more stringent demands on turbocharger performance at corresponding operating points. As a crucial component of the turbocharger, improving compressor efficiency can effectively enhance the overall performance of the turbocharger; therefore, improving compressor performance is extremely important.

[0003] Currently, besides optimizing the compressor impeller and casing through hydrodynamic design to improve compressor performance, optimal compressor performance can also be achieved by matching the structural parameters of the compressor impeller and casing. Structural parameters affecting compressor performance include impeller inlet and outlet diameters, impeller outlet blade height, diffuser width, and diffuser inlet / outlet ratio. Once the compressor configuration is determined, the only adjustable parameter is the diffuser width. Existing designs typically use a movable plate to adjust the diffuser width, with the plate limited and adjusted by screws. However, this method only allows for manual adjustment and cannot achieve automatic adjustment.

[0004] In summary, there is an urgent need for a compressor with an adjustable diffuser width to solve or at least partially solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a compressor with an adjustable diffuser width, aiming to solve the problem that existing designs cannot automatically adjust the diffuser width. The specific technical solution is as follows:

[0006] A compressor with adjustable diffuser width includes a casing body, an impeller, and a pneumatic actuator. The casing body includes a fixed frame, a pressure shell, a diffuser plate, and a back plate. The back plate is fixedly connected to the pressure shell, and the diffuser plate is slidably connected to the back plate and located on the side closer to the pressure shell. The pressure shell has an inlet and an outlet. The impeller is rotatably connected inside the pressure shell. The back plate, pressure shell, and diffuser plate are all fixedly connected to the fixed frame via the back plate. A diffusion gap is provided between the diffuser plate and the pressure shell. The pneumatic actuator is mounted on the fixed frame, and its output end is connected to the diffuser plate. An air pipe extends from the outlet of the pressure shell, and the end of the air pipe away from the pressure shell is connected to the pneumatic actuator, so that the pneumatic actuator drives the back plate to slide closer to or away from the pressure shell to adjust the size of the diffusion gap.

[0007] Preferably, the pneumatic actuator includes a cylinder, a crank, a shift fork, and a push rod, which are connected in sequence. The first end of the cylinder is hinged to a fixed frame, and the second end of the cylinder is hinged to the input end of the crank. The crank is hinged to the fixed frame, and the output end of the crank is fixedly connected to the shift fork. A pin is fixedly connected to the end of the shift fork away from the crank. A drive groove is provided radially on the push rod, and the pin is movably connected in the drive groove. The end of the push rod away from the shift fork passes through a back plate and is fixedly connected to a diffuser plate. The push rod is arranged parallel to the sliding direction of the diffuser plate.

[0008] Preferably, the pneumatic actuator includes a cylinder, a crank, a shift fork, and a push rod, which are connected in sequence. The first end of the cylinder is hinged to a fixed frame, and the second end of the cylinder is hinged to the input end of the crank. The crank is hinged to the fixed frame, and the output end of the crank is fixedly connected to the shift fork. The end of the shift fork away from the crank is provided with a drive groove, which is arranged along the length of the shift fork. The push rod is provided with a pin, which is slidably connected in the drive groove. The end of the push rod away from the shift fork passes through a back plate and is fixedly connected to a diffuser plate. The push rod is arranged parallel to the sliding direction of the diffuser plate.

[0009] Furthermore, the cylinder includes a cylinder body, a piston rod, and an elastic element. The cylinder body is hinged to a fixed frame, the piston rod is slidably connected to the cylinder body, and the end of the piston rod away from the cylinder body is hinged to a crank. There is a cavity between the cylinder body and the piston rod, and the air pipe communicates with the cavity. The elastic element is located on the side away from the cavity, and the first end of the elastic element abuts against the cylinder body, and the second end of the elastic element abuts against the piston rod.

[0010] Furthermore, two push rods are arranged symmetrically along the impeller axis. Two pins are arranged on the shift fork. The first end of the shift fork is connected to one of the push rods through one of the pins, and the second end of the shift fork is connected to the other push rod through the other pin.

[0011] Furthermore, the crank includes a drive arm, a driven arm, and a locking assembly, wherein the drive arm is telescopically arranged within the driven arm, or the driven arm is telescopically arranged within the drive arm, and the locking assembly is used to lock the drive arm and the driven arm.

[0012] Furthermore, the locking assembly includes a screw that passes through the driven arm and is rotatably connected to the drive arm, the screw being threadedly connected to the driven arm, and the screw being arranged along the extension and retraction direction of the drive arm.

[0013] Furthermore, the locking assembly also includes a locking nut, which is threaded onto the screw, and one side of the locking nut abuts against the driven arm.

[0014] Furthermore, a slider is provided on the diffuser plate, and a groove is provided on the back plate, with the slider slidably connected in the groove.

[0015] Furthermore, a guide surface is provided at the end of the diffuser plate near the impeller, and the guide surface is arranged facing the impeller.

[0016] The application of the technical solution of this utility model has the following beneficial effects:

[0017] When the pressure at the diffuser gap increases, the pressure at the corresponding outlet also increases, thus increasing the pressure supplied to the pneumatic actuator via the air pipe. This, in turn, pushes the diffuser plate towards the pressure shell, reducing the diffuser gap and minimizing energy loss caused by turbulence at the diffuser gap. Conversely, when the pressure at the diffuser gap decreases, the pressure at the corresponding outlet decreases, causing the pressure supplied to the pneumatic actuator via the air pipe to decrease. This, in turn, pushes the diffuser plate away from the pressure shell, increasing the diffuser gap. Through the configuration of the actuator and air pipe, automatic adjustment of the diffuser gap is achieved.

[0018] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. These will be described below with reference to... Figures 1-7 The present invention will be described in further detail below. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 This is one of the overall structural schematic diagrams of a compressor with adjustable diffuser width according to this utility model;

[0021] Figure 2 This is the second schematic diagram of the overall structure of a compressor with adjustable diffuser width according to this utility model;

[0022] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a schematic diagram of the internal structure of a compressor with adjustable diffuser width according to the present invention;

[0024] Figure 5 yes Figure 4 Enlarged view at point B;

[0025] Figure 6 This is a cross-sectional view of the crank in a compressor with an adjustable diffuser width according to this utility model;

[0026] Figure 7 This is a cross-sectional view of the cylinder in a compressor with an adjustable diffuser width according to the present invention.

[0027] The components are as follows: 1. Main body of the casing; 11. Fixing frame; 12. Pressure shell; 121. Air inlet; 122. Air outlet; 123. Air pipe; 13. Diffuser plate; 131. Slider; 132. Guide surface; 14. Back plate; 15. Diffuser gap; 2. Impeller; 3. Pneumatic actuator; 31. Cylinder; 311. Cylinder body; 312. Piston rod; 313. Cavity; 314. Elastic element; 32. Crank; 321. Drive arm; 322. Driven arm; 323. Locking assembly; 3231. Screw; 3232. Locking nut; 33. Shift fork; 331. Pin; 34. Push rod; 341. Drive groove. Detailed Implementation

[0028] To facilitate understanding of this invention, a more comprehensive description is provided below, along with preferred embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this invention.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0030] Example:

[0031] See Figures 1-7 This embodiment provides a compressor with an adjustable diffuser width, including a housing body 1, an impeller 2, and a pneumatic actuator 3. The housing body 1 includes a fixing frame 11, a pressure shell 12, a diffuser plate 13, and a back plate 14. The back plate 14 is detachably fixed to the pressure shell 12 by bolts. The diffuser plate 13 is slidably connected to the back plate 14 along the central axis of the pressure shell 12 and is located on the side close to the pressure shell 12. The pressure shell 12 has an air inlet 121 and an air outlet 122. The impeller 2 is rotatably connected inside the pressure shell 12. The back plate 14, the pressure shell 12, the diffuser plate 13, the diffuser plate 14, the diffuser plate ... Both the housing 12 and the diffuser plate 13 are fixedly connected to the mounting frame 11 via the back plate 14; a diffuser gap 15 is provided between the diffuser plate 13 and the housing 12; the pneumatic actuator 3 is mounted on the mounting frame 11, the output end of the pneumatic actuator 3 is connected to the diffuser plate 13, and an air pipe 123 is led out from the air outlet 122 of the housing 12. The end of the air pipe 123 away from the housing 12 is connected to the pneumatic actuator 3, so that the pneumatic actuator 3 drives the back plate 14 to slide closer to or away from the housing 12 to adjust the size of the diffuser gap 15.

[0032] Research has shown that when the diffusion gap 15 is large, the higher the pressure at the diffusion gap 15, the easier it is to generate turbulence. Turbulence at this point causes significant gas resistance, leading to increased power consumption. Appropriately reducing the diffusion gap 15 at this point can effectively reduce the generation of turbulence and thus reduce power consumption. Conversely, when the pressure at the diffusion gap 15 is high, the gap needs to be controlled to be relatively small, and when the pressure at the diffusion gap 15 is low, the diffusion gap 15 needs to be correspondingly increased.

[0033] Specifically, one side of the back plate 14 is fixedly connected to the pressure shell 12 by bolts, and the other side of the back plate 14 is fixedly connected to the fixing frame 11 by bolts. It should be noted that the back plate 14, the diffuser plate 13, and the pressure shell 12 corresponding to the position of the diffuser plate 13 constitute a diffuser, and the width of the diffuser refers to the width of the diffuser gap 15.

[0034] It can be understood that when impeller 2 is working, it draws in gas from the inlet 121 of the pressure shell 12. Driven by impeller 2, the air is thrown out from the outer periphery of impeller 2 and enters the outlet 122 through the diffuser gap 15 before being discharged. It should be noted that when the pressure at the diffuser gap 15 increases, the pressure at the outlet 122 also increases, thereby increasing the pressure delivered to the pneumatic actuator 3 by the air pipe 123. This, in turn, pushes the diffuser plate 13 towards the pressure shell 12, reducing the diffuser gap 15 and thus minimizing energy loss caused by turbulence at the diffuser gap 15. Conversely, when the pressure at the diffuser gap 15 decreases, the pressure at the outlet 122 decreases accordingly, causing the pressure delivered to the pneumatic actuator 3 by the air pipe 123 to decrease. This, in turn, pushes the diffuser plate 13 away from the pressure shell 12, increasing the diffuser gap 15. The automatic adjustment of the diffuser gap 15 is achieved by setting up the drive actuator and the air pipe 123.

[0035] Preferably, the pneumatic actuator 3 includes a cylinder 31, a crank 32, a shift fork 33, and a push rod 34. The cylinder 31, crank 32, shift fork 33, and push rod 34 are connected in sequence. The first end of the cylinder 31 is hinged to the fixed frame 11, and the second end of the cylinder 31 is hinged to the input end of the crank 32. The crank 32 is hinged to the fixed frame 11, and the output end of the crank 32 is fixedly connected to the shift fork 33. A pin 331 is fixedly connected to the end of the shift fork 33 away from the crank 32. A drive groove 341 is provided radially on the push rod 34, and the pin 331 is movably connected in the drive groove 341. The end of the push rod 34 away from the shift fork 33 passes through the back plate 14 and is fixedly connected to the diffuser plate 13. The push rod 34 is arranged parallel to the sliding direction of the diffuser plate 13.

[0036] It is understood that when the gas pressure rises, the gas discharged from the outlet 122 of the pressure shell 12 is delivered to the cylinder 31 through the air pipe 123. The cylinder 31 drives the crank 32 to rotate, and the crank 32 drives the shift fork 33 to move the push rod 34. The push rod 34 pushes the diffuser plate 13 to move, making the diffuser gap 15 smaller. Through the arrangement of the crank 32, the linear motion of the cylinder 31 is converted into rotation. Through the arrangement of the crank 32, shift fork 33, push rod 34, pin 331 and drive groove 341, the rotational motion of the crank 32 is converted into the linear motion of the push rod 34.

[0037] It should be noted that in another embodiment of this application, the drive groove 341 is disposed on the shift fork 33 and the pin 331 is disposed on the push rod 34. Only the installation positions are reversed, but the functions are basically the same, and will not be described in detail here.

[0038] Furthermore, the cylinder 31 includes a cylinder body 311, a piston rod 312, and an elastic element 314. The cylinder body 311 is hinged to the fixed frame 11, the piston rod 312 is slidably connected inside the cylinder body 311, and the end of the piston rod 312 away from the cylinder body 311 is hinged to the crank 32. There is a cavity 313 between the cylinder body 311 and the piston rod 312, and the air pipe 123 communicates with the cavity 313. The elastic element 314 is disposed on the side away from the cavity 313, and the first end of the elastic element 314 abuts against the cylinder body 311, and the second end of the elastic element 314 abuts against the piston rod 312.

[0039] Specifically, the air pipe 123 is connected to the cylinder 311 and communicates with the inside of the cylinder 311, supplying air to the inside of the cylinder 311 through the air pipe 123.

[0040] It is understood that when gas enters the cavity 313 between the cylinder 311 and the piston rod 312 from the air pipe 123, the volume of the cavity 313 increases, and the gas pushes the piston rod 312 to move outward from the cylinder 311. As the cylinder 311 moves, the piston rod 312 compresses the elastic element 314. The elastic element 314 is compressed and applies a reaction force to the piston rod 312. As the piston rod 312 moves, the compression of the elastic element 314 increases, and the reaction force applied by the elastic element 314 to the piston rod 312 also increases until the pressure of the gas applied to the piston rod 312, the force of the crank 32 acting on the piston rod 312, and the elastic force of the elastic element 314 are balanced. At this time, the piston rod 312 stops moving, thereby allowing air to be supplied to the cylinder 311 through the air pipe 123 and realizing the control of the piston rod 312, and thus realizing the control of the moving distance of the diffuser plate 13 through the piston rod 312. It should be noted that when the pressure at the diffuser increases, the pressure at the outlet 122 of the pressure casing 12 also increases, and the increase in pressure at the outlet 122 of the pressure casing 12 is greater than the increase in pressure at the diffuser.

[0041] It is worth noting that in this embodiment, the elastic element 314 is a spring. In other embodiments of this application, the elastic element 314 may also be a reed, a gas spring, or other structures or components that can deform and accumulate elastic potential energy.

[0042] Furthermore, two push rods 34 are arranged symmetrically along the axis of the impeller 2. Two pins 331 are arranged on the shift fork 33. The first end of the shift fork 33 is connected to one of the push rods 34 through one of the pins 331, and the second end of the shift fork 33 is connected to the other push rod 34 through the other pin 331.

[0043] It is known that the diffuser plate 13 is an annular pressure plate. Two push rods 34 are arranged circumferentially along the axis of the impeller 2 and connected to the annular diffuser plate 13. The fork 33 drives the two push rods 34 to move simultaneously, so that the diffuser plate 13 is subjected to uniform force and the diffuser plate 13 slides more smoothly and evenly.

[0044] Furthermore, the crank 32 includes a drive arm 321, a driven arm 322, and a locking assembly 323. The drive arm 321 is telescopically arranged within the driven arm 322, and the locking assembly 323 is used to lock the drive arm 321 and the driven arm 322.

[0045] It is understood that the drive arm 321 is telescopically arranged within the driven arm 322. By adjusting the relative position of the drive arm 321 and the driven arm 322, and then locking them together via the locking assembly 323, the length of the crank 32 can be adjusted. A longer crank 32 results in a longer lever arm for the cylinder 31, leading to a greater force on the push rod 34 and a longer movement distance for the diffuser plate 13, and vice versa. Thus, the movement distance of the diffuser plate 13 can be adjusted by regulating the length of the crank 32.

[0046] It should be noted that in some other embodiments of this application, the driven boom 322 may also be telescopically arranged within the drive boom 321.

[0047] Furthermore, the locking assembly 323 includes a screw 3231 that passes through the driven arm 322 and is rotatably connected to the drive arm 321. The screw 3231 is threadedly connected to the driven arm 322 and is arranged along the extension and retraction direction of the drive arm 321.

[0048] It is known that screw 3231 is rotatably connected to drive arm 321, and screw 3231 is threadedly connected to driven arm 322. When screw 3231 is rotated, screw 3231 moves along the length of driven arm 322 and pushes drive arm 321 to extend or retract into driven arm 322, thereby realizing the adjustment of crank 32 length.

[0049] Furthermore, the locking assembly 323 also includes a locking nut 3232, which is threaded onto the screw 3231, and one side of the locking nut 3232 abuts against the driven arm 322. It should be noted that, to increase vibration resistance, an elastic washer can be added between the nut and the driven arm 322. The elastic washer is coaxially sleeved on the screw 3231, with its first end abutting against the locking nut 3232 and its second end abutting against the outer surface of the driven arm 322.

[0050] It is known that although screw 3231 has a certain self-locking function, it may rotate under external force or vibration, causing the length of the rocker arm to change. The locking nut 3232 is threaded onto screw 3231. When screw 3231 needs to be tightened, it is screwed tight, causing the sidewall of the locking nut 3232 to press against the outer surface of the driven arm 322. The force of the locking nut 3232 pressing against the driven arm 322 reacts to the locking nut 3232, generating a large static friction between the locking nut 3232 and screw 3231, as well as between screw 3231 and driven arm 322, thus preventing screw 3231 from loosening.

[0051] Furthermore, a slider 131 is provided on the diffuser plate 13, and a groove is provided on the back plate 14, with the slider 131 slidably connected in the groove.

[0052] Specifically, the diffuser plate 13 is an annular plate, and the slider 131 is an annular slider 131, which is fixedly connected to the diffuser plate 13. The groove is an annular groove, and two sliders 131 are provided, arranged coaxially. Correspondingly, two grooves are also provided, and the two sliders 131 are slidably connected in the two grooves. The outer surface of the slider 131 is tightly fitted with the inner wall of the groove. It can be seen that through the cooperation of the slider 131 and the groove, the diffuser plate 13 can slide smoothly relative to the back plate 14. Secondly, the cooperation of the slider 131 and the groove forms a labyrinth seal, reducing the leakage of high-pressure gas (it should be noted that high-pressure gas here refers to gas pressure higher than that of the gas at the inlet 121).

[0053] Furthermore, a guide surface 132 is provided at one end of the diffuser plate 13 near the impeller 2, and the guide surface 132 is arranged facing the impeller 2.

[0054] Specifically, the guide surface 132 is formed by chamfering the diffuser plate 13. Due to the presence of the guide surface 132, the diffusion gap 15 formed between the guide surface 132 and the inner wall of the pressure shell 12 is larger on the side closer to the impeller 2 and smaller on the side farther away from the impeller 2. This allows the gas delivered from the impeller 2 to be guided by the funnel-shaped opening, and the gas delivered from the impeller 2 to convert kinetic energy into pressure energy.

[0055] The working principle of this utility model is as follows:

[0056] When the impeller 2 rotates, it pumps the gas from the air inlet 121 of the pressure shell 12 to the diffuser gap 15, and then flows outward through the diffuser gap 15, converting the kinetic energy of the gas into static pressure energy. The flow rate slows down, the pressure rises, and the gas is discharged from the air outlet 122 on the pressure shell 12. When the impeller 2 speed increases, the gas pressure pumped from the diffuser gap 15 rises, and the pressure at the outlet 122 also rises. The gas at the outlet 122 is transmitted to the cylinder 31 through the gas pipe 123 and pushes the piston rod 312 to move. The piston rod 312 pushes the crank 32 to rotate. The crank 32 pushes the push rod 34 through the shift fork 33 to drive the diffuser plate 13 to move towards the pressure shell 12, making the diffuser gap 15 smaller. During the movement of the piston rod 312, the elastic element 314 is compressed. As the compression of the elastic element 314 increases, the force of the elastic element 314 acting on the piston rod 312 also increases until the elastic force of the elastic element 314, the pressure of the gas applied to the piston rod 312, and the resistance of the crank 32 are balanced, and then the diffuser plate 13 stops moving. When the gas pressure decreases, the pressure applied to the piston rod 312 also decreases. The elastic element 314 then pushes the piston rod 312 back, causing the piston rod 312 to rotate in the opposite direction. This rotation, via the shift fork 33, drives the push rod 34 to pull the diffuser plate 13 away from the pressure shell 12, thereby increasing the diffusion gap 15. The automatic adjustment of the diffusion gap 15 is achieved through the arrangement of the cylinder 31, crank 32, shift fork 33, and push rod 34.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A compressor with adjustable diffuser width, characterized in that: It includes the main body of the casing (1), the impeller (2), and the pneumatic actuator (3). The main body (1) of the casing includes a fixing frame (11), a pressure shell (12), a diffuser plate (13) and a back plate (14). The back plate (14) is fixedly connected to the pressure shell (12). The diffuser plate (13) is slidably connected to the back plate (14) and is located on the side close to the pressure shell (12). The pressure shell (12) has an air inlet (121) and an air outlet (122). The impeller (2) is rotatably connected inside the pressure shell (12). The back plate (14), the pressure shell (12) and the diffuser plate (13) are all fixedly connected to the fixing frame (11) through the back plate (14). A diffusion gap (15) is provided between the diffuser plate (13) and the pressure shell (12); The pneumatic actuator (3) is mounted on the fixed frame (11). The output end of the pneumatic actuator (3) is connected to the diffuser plate (13). An air pipe (123) is led out from the air outlet (122) of the pressure shell (12). The end of the air pipe (123) away from the pressure shell (12) is connected to the pneumatic actuator (3) so that the pneumatic actuator (3) drives the back plate (14) to slide closer to or away from the pressure shell (12) to adjust the size of the diffuser gap (15).

2. A compressor with adjustable diffuser width according to claim 1, characterized in that: The pneumatic actuator (3) includes a cylinder (31), a crank (32), a shift fork (33), and a push rod (34), which are connected in sequence. The first end of the cylinder (31) is hinged to the fixed frame (11), and the second end of the cylinder (31) is hinged to the input end of the crank (32). The crank (32) is hinged to the fixed frame (11), and the output end of the crank (32) is fixedly connected to the shift fork (33). The shift fork (33) is fixedly connected to a pin (331) at the end away from the crank (32). The push rod (34) is provided with a drive groove (341) along the radial direction. The pin (331) is movably connected in the drive groove (341). The end of the push rod (34) away from the shift fork (33) passes through the back plate (14) and is fixedly connected to the diffuser plate (13). The push rod (34) is arranged parallel to the sliding direction of the diffuser plate (13).

3. A compressor with adjustable diffuser width according to claim 1, characterized in that: The pneumatic actuator (3) includes a cylinder (31), a crank (32), a shift fork (33), and a push rod (34), which are connected in sequence. The first end of the cylinder (31) is hinged to the fixed frame (11), and the second end of the cylinder (31) is hinged to the input end of the crank (32). The crank (32) is hinged to the fixed frame (11), and the output end of the crank (32) is fixedly connected to the shift fork (33). The shift fork (33) has a drive groove (341) at the end away from the crank (32), and the drive groove (341) is arranged along the length direction of the shift fork (33); the push rod (34) is provided with a pin (331), the pin (331) is slidably connected in the drive groove (341), the end of the push rod (34) away from the shift fork (33) passes through the back plate (14) and is fixedly connected to the diffuser plate (13), and the push rod (34) is arranged parallel to the sliding direction of the diffuser plate (13).

4. A compressor with adjustable diffuser width according to claim 2 or 3, characterized in that: The cylinder (31) includes a cylinder body (311), a piston rod (312) and an elastic element (314). The cylinder body (311) is hinged to the fixed frame (11). The piston rod (312) is slidably connected inside the cylinder body (311), and one end of the piston rod (312) away from the cylinder body (311) is hinged to the crank (32). The cylinder (311) and the piston rod (312) have a cavity (313), and the air pipe (123) is connected to the cavity (313); The elastic element (314) is disposed on the side away from the cavity (313), and the first end of the elastic element (314) abuts against the cylinder (311), and the second end of the elastic element (314) abuts against the piston rod (312).

5. A compressor with adjustable diffuser width according to claim 4, characterized in that: Two push rods (34) are arranged symmetrically along the axis of the impeller (2). Two pins (331) are arranged on the shift fork (33). The first end of the shift fork (33) is connected to one of the push rods (34) through one of the pins (331), and the second end of the shift fork (33) is connected to the other push rod (34) through the other pin (331).

6. A compressor with adjustable diffuser width according to claim 2 or 3, characterized in that: The crank (32) includes a drive arm (321), a driven arm (322), and a locking assembly (323). The drive arm (321) is telescopically arranged within the driven arm (322), or the driven arm (322) is telescopically arranged within the drive arm (321). The locking assembly (323) is used to lock the drive arm (321) and the driven arm (322).

7. A compressor with adjustable diffuser width according to claim 6, characterized in that: The locking assembly (323) includes a screw (3231) that passes through the driven arm (322) and is rotatably connected to the drive arm (321). The screw (3231) is threadedly connected to the driven arm (322) and is arranged along the extension and retraction direction of the drive arm (321).

8. A compressor with adjustable diffuser width according to claim 7, characterized in that: The locking assembly (323) further includes a locking nut (3232) which is threaded onto the screw (3231) and one side of the locking nut (3232) abuts against the driven arm (322).

9. A compressor with adjustable diffuser width according to any one of claims 1-3, characterized in that: The diffuser plate (13) is provided with a slider (131), and the back plate (14) is provided with a groove, and the slider (131) is slidably connected in the groove.

10. A compressor with adjustable diffuser width according to any one of claims 1-3, characterized in that: The diffuser plate (13) has a guide surface (132) at one end near the impeller (2), and the guide surface (132) is arranged facing the impeller (2).

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