Diffuser and compressor

Abstract

The utility model provides a diffuser and a compressor. The diffuser includes: a first diffuser portion including a first stationary diffuser body portion; the second diffuser part is arranged opposite to the first diffuser part, forms a diffusion flow channel and comprises a movable diffuser body part; and the driving part is in driving connection with the movable diffuser body part and is configured to drive the movable diffuser body part to move relative to the first static diffuser body part so as to change the minimum through-flow area of the diffusion flow channel. According to the diffuser provided by the invention, the internal gas flowing condition of the compressor where the diffuser is located under the small load condition can be improved, so that the compressor can normally operate under the small load condition, and the operation range of the compressor is widened.

Description

Technical Field

[0001] The present application relates to the technical field of gas compression equipment, and in particular to a diffuser and a compressor. Background Art

[0002] When a centrifugal compressor is running under a light load, the gas in the flow channel is prone to backflow, causing the gas flow to deteriorate. When the above phenomenon develops further and the pressure at the compressor outlet cannot meet the back pressure requirement, the flow rate of the compressor decreases, and the gas at the compressor outlet will flow back into the compressor. As the gas flows back into the compressor, the back pressure of the compressor decreases, the flow rate of the compressor begins to increase again, the flow of the gas in the compressor improves, and the gas can be discharged smoothly again. However, after the gas is discharged from the compressor, the back pressure begins to increase again, and the pressure at the compressor outlet cannot meet the back pressure requirement, and the gas backflow reappears in the compressor, causing the above process to repeat itself, causing the compressor to experience surge phenomenon with low-frequency and large vibration during operation, causing the compressor to operate in an unstable condition and affecting the use effect.

[0003] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0004] The purpose of the present application is to provide a diffuser and a compressor, aiming to solve the problem that the gas in the flow channel is prone to backflow, thereby causing the gas flow condition to deteriorate.

[0005] A first aspect of the present application provides a diffuser, comprising:

[0006] a first diffuser section including a first stationary diffuser body section;

[0007] a second diffuser portion, arranged opposite to the first diffuser portion and forming a diffuser flow passage, including a movable diffuser body portion; and

[0008] The driving portion is drivingly connected to the movable diffuser body portion and is configured to drive the movable diffuser body portion to move relative to the first stationary diffuser body portion to change the minimum flow area of ​​the diffuser flow channel.

[0009] In the diffuser of some embodiments, the movable diffuser body is an annular body coaxial with the axis of the diffuser, and the movable diffuser surface of the movable diffuser body facing the first stationary diffuser body includes a conical surface inclined toward the first stationary diffuser body from the gas inlet side to the gas outlet side of the diffuser.

[0010] In the diffuser of some embodiments, the inner circumferential surface of the annular body and the conical surface are transitioned by a rounded corner.

[0011] In some embodiments of the diffuser, the second diffuser section comprises a second stationary diffuser body section, wherein:

[0012] The movable diffuser body portion is located radially inward of the second stationary diffuser body portion; or

[0013] A side of the second stationary diffuser body portion facing the first diffuser portion has a mounting groove, and the movable diffuser body portion is disposed in the mounting groove.

[0014] In the diffuser of some embodiments, the driving unit comprises:

[0015] A driving rod, a first end of which is connected to the main body of the movable diffuser, and the driving rod is arranged to be reciprocatingly movable along the axial direction of the diffuser;

[0016] a cam rotatably disposed about a rotation axis fixed relative to the first stationary diffuser body portion, the end surface of the second end of the drive rod abutting against a circumferential surface of the cam;

[0017] An actuator is drivingly connected to the cam to drive the cam to rotate around the rotation axis.

[0018] In the diffuser of some embodiments, the driving part includes a plurality of driving rods, a plurality of cams arranged one-to-one corresponding to the plurality of driving rods, and a transmission device;

[0019] The actuator comprises at least one rotary actuation unit, the rotary actuation unit comprising an output shaft;

[0020] The multiple cams include at least one first cam and at least one second cam, the at least one first cam is arranged in a one-to-one correspondence with the at least one rotary actuating unit, the first cam is coaxial with the output shaft of the corresponding rotary actuating unit and is connected without relative rotation, and the second cam is drivingly connected to the at least one rotary actuating unit through the transmission device.

[0021] In the diffuser of some embodiments, the transmission device includes:

[0022] A plurality of first connecting rods are arranged corresponding to the plurality of cams one by one, wherein the first ends of the first connecting rods are connected to the corresponding cams without relative rotation;

[0023] A plurality of second connecting rods are arranged corresponding to the plurality of cams one by one, and the first ends of the second connecting rods are rotatably connected to the second ends of the corresponding first connecting rods;

[0024] A driving ring is rotatably arranged around a rotation axis extending along the axial direction of the diffuser, and the second end of the second connecting rod is rotatably connected to the driving ring.

[0025] In some embodiments of the diffuser,

[0026] The drive ring is relatively stationary along the axial direction of the diffuser; and / or

[0027] The first end and the second end of the second connecting rod are respectively connected to the first connecting rod and the driving ring through a universal joint.

[0028] In the diffuser of some embodiments, the driving portion includes a driving rod mounting portion, and the driving rod mounting portion includes a stationary shell fixed relatively to the first stationary diffuser body portion, and the stationary shell has a receiving hole therein, and the receiving hole extends along the axial direction of the diffuser, and the driving rod is located in the receiving hole.

[0029] In the diffuser of some embodiments, the drive rod mounting portion further includes a bushing, which extends along the axial direction of the diffuser and is disposed between a hole wall of the accommodating hole and the drive rod.

[0030] In some embodiments of the diffuser,

[0031] The drive rod mounting portion further includes a bushing, which extends along the axial direction of the diffuser and is disposed between the hole wall of the accommodating hole and the drive rod, and the mounting portion further includes a support ring, which extends along the axial direction of the diffuser, is disposed between the bushing and the drive rod and is located in a groove on the bushing; or

[0032] The mounting portion further comprises a support ring, which extends along the axial direction of the diffuser, is arranged between the hole wall of the accommodating hole and the driving rod, and is located in a groove on the hole wall of the accommodating hole.

[0033] In the diffuser of some embodiments, the driving portion further includes a driving rod restoring portion configured to continuously apply a force to the driving rod to cause an end surface of the second end of the driving rod to abut against a circumferential surface of the cam.

[0034] In some embodiments of the diffuser,

[0035] The driving portion further includes a driving rod resetting portion, the driving rod resetting portion being configured to continuously apply a force to the driving rod so that an end surface of the second end thereof abuts against a circumferential surface of the cam;

[0036] The driving rod resetting portion comprises a first spring, and two ends of the first spring act on the driving rod and the stationary housing respectively.

[0037] In the diffuser of some embodiments, the driving unit comprises:

[0038] a driving cylinder, comprising a cylinder body and a piston, wherein the piston comprises a piston body and a piston rod, wherein the cylinder body is relatively fixed to the first stationary diffuser body portion, the piston body is reciprocatably disposed in the cylinder body along the axial direction of the diffuser, the first end of the piston rod is connected to the piston body, and the second end of the piston rod is connected to the movable diffuser body portion; and

[0039] The fluid pipeline is connected to the cylinder body and is configured to input and output pressurized fluid to the driving cylinder to drive the piston to reciprocate relative to the cylinder body, thereby driving the movable diffuser body part to move relative to the first stationary diffuser body part.

[0040] In some embodiments of the diffuser,

[0041] The inner cavity of the cylinder body is divided into a first cavity and a second cavity by the piston body, and the fluid pipeline is connected to the first cavity;

[0042] The driving cylinder further includes a second spring, which is disposed in the second chamber and configured to apply a force to the piston body to reduce the size of the first chamber.

[0043] In the diffuser of some embodiments, the cylinder body is further provided with a pressure-stabilizing hole communicating with the second chamber, and the pressure-stabilizing hole is configured to communicate the second chamber with the outside of the driving cylinder.

[0044] A second aspect of the present application provides a compressor, comprising at least one impeller and at least one diffuser corresponding to the at least one impeller, wherein the at least one diffuser comprises the diffuser described in any one of the first aspect of the present application.

[0045] In the compressor described in some embodiments, the at least one impeller includes a primary impeller and a secondary impeller, and the at least one diffuser includes a primary diffuser corresponding to the primary impeller and a secondary diffuser corresponding to the secondary impeller, and the primary diffuser and the secondary diffuser are both the diffusers described in the first aspect of the present application.

[0046] In the compressor described in some embodiments, one of the first-stage diffuser and the second-stage diffuser is the diffuser described in the first aspect of the present application, whose driving portion includes the driving rod, the cam and the actuator, and the other includes the diffuser described in the first aspect of the present application, whose driving portion includes the driving cylinder and the fluid pipeline.

[0047] In the compressor described in some embodiments, the at least one impeller includes a primary impeller and an adjustable guide vane structure arranged upstream of the primary impeller, the at least one diffuser includes a primary diffuser corresponding to the primary impeller, the primary diffuser is the diffuser described in the first aspect of the present application, wherein the driving portion includes the driving rod, the cam and the actuator, and the driving portion of the diffuser is arranged in a linkage with the adjustable guide vane structure to drive the guide vane movement of the adjustable guide vane structure to change the fluid flow entering the primary impeller while driving the movable diffuser body portion to move relative to the first stationary diffuser body portion.

[0048] In the compressor described in some embodiments, the driving part includes a driving ring (1304), and the driving ring (1304) is rotatably arranged around a rotation axis extending along the axial direction of the diffuser. The driving part is linked to the adjustable guide vane structure through the driving ring (1304).

[0049] In the compressor described in some embodiments, the compressor includes the driving part described in the first aspect of the present application, which includes the driving cylinder and a diffuser of a fluid pipeline, and the fluid pipeline is connected to the outlet of the compressor to transport the gas working fluid of the compressor to the driving cylinder as the pressurized fluid.

[0050] The diffuser provided in the present application includes a first diffuser portion and a second diffuser portion. A flow area of ​​the diffuser with a variable flow area is formed by a first stationary diffuser body portion of the first diffuser portion and a movable diffuser body portion of the second diffuser. The minimum flow area of ​​the diffuser is changed by relative movement between the movable diffuser body portion and the first stationary diffuser body portion, which can improve the gas flow inside the compressor under light load conditions, so that the compressor can operate normally even under light load conditions, thereby widening the operating range of the compressor.

[0051] The compressor of the present application has the advantages of the diffuser of the present application.

[0052] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0054] Figure 1 This is a partial structural schematic diagram of a compressor according to an embodiment of the present application.

[0055] Figure 2FIG. 1 is a schematic structural diagram of a diffuser according to an embodiment of the present application.

[0056] Figure 3 for Figure 2 A schematic diagram of the partial cross-sectional structure of the diffuser is shown.

[0057] Figure 4 for Figure 2 Schematic diagram of the exploded structure of the transmission device of the driving part of the diffuser shown.

[0058] Figure 5 FIG. 1 is a schematic structural diagram of a diffuser according to an embodiment of the present application.

[0059] Figure 6 for Figure 5 A schematic diagram of the partial cross-sectional structure of the diffuser is shown. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0062] In the description of the present application, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0063] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0064] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0065] like Figures 1 to 6 As shown, an embodiment of the present application provides a compressor and a diffuser.

[0066] The diffuser provided in the embodiment of the present application includes a first diffuser portion, a second diffuser portion and a driving portion. The first diffuser portion includes a first stationary diffuser body portion. The second diffuser portion is arranged opposite to the first diffuser portion and forms a diffuser flow channel, including a movable diffuser body portion. The driving portion is drivingly connected to the movable diffuser body portion and is configured to drive the movable diffuser body portion to move relative to the first stationary diffuser body portion to change the minimum flow area of ​​the diffuser flow channel.

[0067] The diffuser based on the embodiment of the present application includes a first diffuser portion and a second diffuser portion. A flow area of ​​the diffuser with a variable flow area is formed by a first stationary diffuser body portion of the first diffuser portion and a movable diffuser body portion of the second diffuser. The minimum flow area of ​​the diffuser is changed by the relative movement of the movable diffuser body portion and the first stationary diffuser body portion, which can improve the gas flow inside the compressor under light load conditions, so that the compressor can operate normally even under light load conditions, thereby widening the operating range of the compressor.

[0068] like Figure 1 The compressor shown includes a first-stage impeller 1700 (only the gas outlet portion of the first-stage impeller 1700 is shown), a second-stage impeller 2500 (only the outlet portion of the second-stage impeller 2500 is shown), a first-stage diffuser located downstream of the first-stage impeller 1700, and a second-stage diffuser located downstream of the second-stage impeller 2500.

[0069] lie in Figure 1The first diffuser on the left side of the center includes a first diffuser section, a second diffuser section and a driving section. The first diffuser section includes a first stationary diffuser body section 1500. The second diffuser section is arranged opposite to the first diffuser section and forms a diffuser flow passage, and includes a movable diffuser body section 1600. The driving section is drivingly connected to the movable diffuser body section 1600 and is configured to drive the movable diffuser body section 1600 to move relative to the first stationary diffuser body section 1500 to change the minimum flow area of ​​the diffuser flow passage of the first diffuser.

[0070] lie in Figure 1 The secondary diffuser on the middle right side includes a first diffuser portion, a second diffuser portion and a driving portion. The first diffuser portion includes a first stationary diffuser body portion 2300. The second diffuser portion is arranged opposite to the first diffuser portion and forms a diffuser flow passage, and includes a movable diffuser body portion 2400. The driving portion is drivingly connected to the movable diffuser body portion 2400 and is configured to drive the movable diffuser body portion 2400 to move relative to the first stationary diffuser body portion 2300 to change the minimum flow area of ​​the diffuser flow passage of the secondary diffuser.

[0071] like Figure 1 , Figure 3 and Figure 6 As shown, in the diffuser of some embodiments, the movable diffuser body portion is an annular body coaxial with the axis of the diffuser, and the movable diffuser surface of the movable diffuser body portion facing the first stationary diffuser body portion includes a conical surface inclined toward the first stationary diffuser body portion from the gas inlet side to the gas outlet side of the diffuser.

[0072] like Figure 1 As shown, the tapered surface is, for example, the tapered surface 1600A of the active diffuser surface of the active diffuser body portion 1600 of the first-stage diffuser or the tapered surface 2400A of the active diffuser surface of the active diffuser body portion 2400 of the second-stage diffuser.

[0073] The active diffuser surface of the active diffuser body includes a conical surface, which is beneficial to reducing the severity of the change in the flow area, thereby helping to reduce eddy currents and noise generated when the airflow passes through the diffuser.

[0074] In the diffuser of some embodiments, the inner circumferential surface of the annular body and the conical surface are transitioned by a rounded corner.

[0075] The use of rounded transition between the inner circumference of the annular body and the conical surface is beneficial to further reduce eddy currents and noise generated when the airflow passes through the diffuser.

[0076] like Figure 1 As shown, a rounded transition is achieved between the conical surface 1600A of the active diffuser surface of the active diffuser body 1600 of the first-stage diffuser and the inner circumferential surface of the annular body through an arc surface 1600B.

[0077] like Figure 1 As shown, in the diffuser of some embodiments, the second diffuser section includes a second stationary diffuser body section. For example, the second diffuser section of the first-stage diffuser includes the second stationary diffuser body section 1100. For another example, the second diffuser section of the second-stage diffuser also includes the second stationary diffuser body section 2100.

[0078] Providing the second stationary diffuser body is advantageous in that the volume of the movable diffuser body can be reduced on the basis of changing the minimum flow area of ​​the diffuser by moving the movable diffuser body relative to the first stationary diffuser body, and at the same time is advantageous in reducing the power of the driving part.

[0079] like Figure 1 As shown, in some embodiments of the diffuser, the movable diffuser body portion is located radially inside the second static diffuser body portion. For example, in a first-stage diffuser, the movable diffuser body portion 1600 is located radially inside the second static diffuser body portion 1100.

[0080] The movable diffuser body is located radially inward of the second stationary diffuser body, which is beneficial for the movable diffuser body to have a larger movable space, so that the minimum flow area of ​​the diffuser can be adjusted in a larger range, which is more suitable for situations where the impeller outlet volume flow is larger, such as the first-stage diffuser corresponding to the first-stage impeller of a two-stage compressor.

[0081] like Figure 1 As shown, in some embodiments of the diffuser, the second stationary diffuser body portion has a mounting groove on one side facing the first diffuser portion, and the movable diffuser body portion is disposed in the mounting groove. For example, the second stationary diffuser body portion 2100 of the two-stage diffuser has a mounting groove on one side facing the first diffuser portion, and the movable diffuser body portion 2400 is disposed in the mounting groove.

[0082] The second stationary diffuser body has a mounting groove on one side facing the first diffuser body, and the movable diffuser body is arranged in the mounting groove, which is beneficial for the movable diffuser body to have a smaller volume, and can reduce the volume of the movable diffuser body. At the same time, it is beneficial to reduce the power of the driving part, and is more suitable for situations where the impeller outlet volume flow is small, such as the secondary diffuser corresponding to the secondary impeller of a two-stage compressor.

[0083] like Figures 1 to 4As shown, in some embodiments of the diffuser, the driving portion includes a driving rod 1401, a cam 1301 and an actuator. The first end of the driving rod 1401 is connected to the movable diffuser body, and the driving rod 1401 is arranged to be reciprocatingly movable along the axial direction of the diffuser. The cam 1301 is rotatably arranged around a rotation axis fixed relative to the first stationary diffuser body, and the end surface of the second end of the driving rod 1401 abuts against the circumferential surface of the cam 1301. The actuator is drivingly connected to the cam 1301 to drive the cam 1301 to rotate around the rotation axis.

[0084] For example, the driving part of the first-stage diffuser of the embodiment of the present application adopts this form. In the first-stage diffuser, the actuator drives the cam 1301 to rotate around the rotation axis, and changes the contact position between the cam 1301 and the end surface of the second end of the driving rod 1401, that is, changes the relative position between the rotation axis of the cam 1301 and the end surface of the second end of the driving rod 1401, so that the driving rod 1401 can change its position relative to the first stationary diffuser body 1500, thereby driving the movable diffuser body 1600 to change its position relative to the first stationary diffuser body 1500, and realizing the change of the minimum flow area.

[0085] The cam 1301 may be configured as an eccentric wheel, for example, to facilitate manufacturing and position control of the movable diffuser body 1600 .

[0086] like Figures 1 to 4 As shown, in some embodiments of the diffuser, the driving part includes a plurality of driving rods 1401, a plurality of cams 1301 arranged in one-to-one correspondence with the plurality of driving rods 1401, and a transmission device. The actuator includes at least one rotary actuating unit, and the rotary actuating unit includes an output shaft. The plurality of cams 1301 include at least one first cam and at least one second cam, and the at least one first cam is arranged in one-to-one correspondence with the at least one rotary actuating unit. The first cam is coaxially connected to the output shaft of the corresponding rotary actuating unit and is non-rotatably connected, and the second cam is drivingly connected to the at least one rotary actuating unit through the transmission device.

[0087] The driving part includes a plurality of driving rods 1401, a plurality of cams 1301 arranged one-to-one corresponding to the plurality of driving rods 1401, and a transmission device, which is conducive to the movable diffuser body 1600 being synchronously driven by the plurality of driving rods 1401, so as to facilitate the movable diffuser body 1600 to be uniformly stressed and move smoothly. In addition, the first cam is directly driven by the rotary actuating unit, and the second cam is driven by the rotary actuating unit through the transmission device, which is conducive to reducing the number of actuating parts and facilitating the synchronous operation of each driving rod 1401. In some embodiments, preferably, the plurality of driving rods 1401 are evenly distributed along the circumference of the diffuser.

[0088] like Figures 1 to 4As shown, the rotary actuating unit is, for example, a motor 1307, the number of the rotary actuating units is, for example, 1, the number of the corresponding first cam is 1, and the remaining cams 1301 are second cams. In an embodiment not shown, the rotary actuating unit may also be an actuating unit of other forms, such as a motor, the number of the rotary actuating units may also be two or more, the number of the first cams is the same as the number of the rotary actuating units, and the remaining cams are second cams.

[0089] The driving part of the driving cam can also be set to other forms. For example, in some alternative embodiments, the output shaft of the rotary actuator unit can also drive the first cam through a transmission device. Optionally, a pair of transmission gears can be set between the output shaft of the motor 1307 and the rotating shaft of the cam 1301.

[0090] like Figures 1 to 4 As shown, in the diffuser of some embodiments, the transmission device includes a plurality of first connecting rods 1302, a plurality of second connecting rods 1305 and a driving ring 1304. The plurality of first connecting rods 1302 are arranged in one-to-one correspondence with the plurality of cams 1301, and the first ends of the first connecting rods 1302 are connected to the corresponding cams 1301 without relative rotation. The plurality of second connecting rods 1305 are arranged in one-to-one correspondence with the plurality of cams 1301, and the first ends of the second connecting rods 1305 are rotatably connected to the second ends of the corresponding first connecting rods 1302. The driving ring 1304 is rotatably arranged around a rotation axis extending along the axial direction of the diffuser, and the second ends of the second connecting rods 1305 are rotatably connected to the driving ring 1304.

[0091] The rotary actuating unit directly drives the first cam to rotate. When the first cam rotates, the first connecting rod 1302 connected to the first cam rotates accordingly, which can drive the second connecting rod 1305 connected to the first connecting rod 1302 to rotate. The rotation of the second connecting rod 1305 drives the driving ring 1304 to rotate, which can drive the remaining second connecting rods 1305 connected to the driving ring 1304 to rotate. The rotation of the remaining second connecting rods 1305 drives the corresponding first connecting rods 1305 connected to each other to rotate, and the corresponding first connecting rods 1305 drive the corresponding second cam to rotate synchronously with the first cam. The rotation of all the first cams and the second cams drives the corresponding driving rods 1401 to move along the axial direction of the diffuser, which can realize the driving of the movable diffuser body 1600 to move along the axial direction of the diffuser.

[0092] In the diffuser of some embodiments, the driving ring 1304 is relatively stationary along the axial direction of the diffuser; and / or the first end and the second end of the second connecting rod 1305 are respectively connected to the first connecting rod 1302 and the driving ring 1304 through a universal joint.

[0093] The drive ring 1304 is relatively still along the axial direction of the diffuser, which reduces the freedom of movement of the drive ring 1304 and is more conducive to the synchronous control of each drive rod 1401. The first end and the second end of the second connecting rod 1305 are respectively connected to the first connecting rod 1302 and the drive ring 1304 through a universal joint, which is conducive to the smooth transmission of force and movement of the transmission device, and is more conducive to the synchronous control of each drive rod 1401.

[0094] like Figures 1 to 4 As shown, in some embodiments of the diffuser, the driving part includes a driving rod mounting part, the driving rod mounting part includes a stationary housing 1200 fixed relatively to the first stationary diffuser body part, the stationary housing 1200 has a receiving hole, the receiving hole extends along the axial direction of the diffuser, and the driving rod 1401 is located in the receiving hole. For example, in a first-stage diffuser, the stationary housing 1200 can be fixedly connected to a side of the second stationary diffuser body part 1100 away from the first stationary diffuser body part 1500. The fixed connection method can be, for example, detachably connected to facilitate production and maintenance after the stationary housing 1200 is separated from the second stationary diffuser body part 1100.

[0095] In the diffuser of some embodiments, the drive rod mounting portion further includes a bushing 1405 , which extends along the axial direction of the diffuser and is disposed between the hole wall of the accommodating hole and the drive rod 1401 .

[0096] By properly setting the size and material of the bushing 1405, it is helpful to guide the driving rod 1401 and reduce wear.

[0097] like Figures 1 to 4 As shown, in the diffuser of some embodiments, the drive rod mounting portion further includes a bushing 1405, which extends along the axial direction of the diffuser and is disposed between the hole wall of the accommodating hole and the drive rod 1401. The mounting portion further includes a support ring 1406, which extends along the axial direction of the diffuser, is disposed between the bushing 1405 and the drive rod 1401 and is located in a groove on the bushing 1405.

[0098] In some embodiments not shown in the figures, the mounting portion further comprises a support ring, which extends along the axial direction of the diffuser, is disposed between the hole wall of the accommodating hole and the driving rod, and is located in a groove on the hole wall of the accommodating hole.

[0099] By properly setting the size and material of the support ring 1406 , it is helpful to guide the drive rod 1401 and reduce wear.

[0100] like Figures 1 to 4 As shown, in the diffuser of some embodiments, the driving portion further includes a driving rod resetting portion, which is configured to continuously apply a force to the driving rod 1401 to cause an end surface of the second end thereof to abut against a circumferential surface of the cam 1301 .

[0101] The drive rod reset portion is provided to facilitate the drive rod 1401 to move at any time following the rotation of the cam 1301, so that the movable diffuser body 1600 can reach the required position in time, and the adjustment of the diffuser minimum flow area can be timely and effective.

[0102] like Figures 1 to 4 As shown, in some embodiments of the diffuser, the driving part further includes a driving rod reset part, which is configured to continuously apply a force to the driving rod 1401 so that the end surface of the second end thereof abuts against the circumferential surface of the cam 1301. The driving rod reset part includes a first spring 1404, and the two ends of the first spring 1404 act on the driving rod 1401 and the stationary housing 1200 respectively. The function of the driving rod reset part is realized by the first spring 1404 acting on the driving rod 1401 and the stationary housing 1200 respectively, with a simple structure and stable function.

[0103] like Figure 1 , Figure 5 and Figure 6 As shown, in the diffuser of some embodiments, the driving part includes a driving cylinder 2200 and a fluid pipeline 2101. The driving cylinder 2200 includes a cylinder body and a piston 2211. The piston 2211 includes a piston body and a piston rod. The cylinder body is relatively fixed to the first stationary diffuser body. The piston body is reciprocatingly arranged in the cylinder body along the axial direction of the diffuser. The first end of the piston rod is connected to the piston body, and the second end of the piston rod is connected to the movable diffuser body. The fluid pipeline 2101 is connected to the cylinder body and is configured to input and output pressurized fluid to the driving cylinder 2200 to drive the piston 2211 to reciprocate relative to the cylinder body, thereby driving the movable diffuser body to move relative to the first stationary diffuser body.

[0104] The minimum flow area of ​​the diffuser can be changed by inputting and outputting pressurized fluid to and from the drive cylinder 2200 through the fluid pipeline 2101 to drive the piston 2211 to reciprocate relative to the cylinder body, thereby driving the movable diffuser body to move relative to the first stationary diffuser body.

[0105] The drive cylinder can be a hydraulic cylinder or a pneumatic cylinder; the drive cylinder can also be a single-acting drive cylinder or a double-acting drive cylinder; the pressurized fluid in the fluid pipeline 2101 can be a liquid, such as the lubricating oil of the compressor, or a gas, such as the high-pressure gaseous refrigerant of the compressor.

[0106] like Figure 1 , Figure 5 and Figure 6As shown, in the diffuser of some embodiments, the inner cavity of the cylinder body is divided into a first cavity 2208 and a second cavity by the piston body, and the fluid line 2101 is connected to the first cavity 2208; the drive cylinder 2200 also includes a second spring 2206, which is arranged in the second cavity and is configured to apply a force to the piston body to cause the first cavity 2208 to shrink.

[0107] The drive cylinder includes the second spring 2206 to simplify the fluid pipeline 2101 and simplify the control process.

[0108] like Figure 1 , Figure 5 and Figure 6 As shown, in the diffuser of some embodiments, a pressure-stabilizing hole 2201 communicating with the second chamber is further provided on the cylinder body, and the pressure-stabilizing hole 2201 is configured to communicate with the second chamber and the outside of the driving cylinder 2200 .

[0109] The provision of the pressure-stabilizing hole is beneficial to maintaining the pressure balance between the second chamber and the outside of the driving cylinder 2200, thereby facilitating the smooth movement of the piston 2211 in the cylinder body.

[0110] like Figure 1 As shown, the compressor provided by the embodiment of the present application includes at least one impeller and at least one diffuser corresponding to the at least one impeller, and the at least one diffuser includes the diffuser of any one of the first aspect of the present application.

[0111] The compressor of the embodiment of the present application has the advantages of the diffuser of the embodiment of the present application.

[0112] In the compressor of some embodiments, at least one impeller includes a primary impeller and a secondary impeller, and at least one diffuser includes a primary diffuser corresponding to the primary impeller and a secondary diffuser corresponding to the secondary impeller, and both the primary diffuser and the secondary diffuser are the diffusers of the present application.

[0113] The first-stage diffuser and the second-stage diffuser cooperate with each other in adjusting the flow passage width, thereby widening the flow operating range of the compressor and avoiding compressor surge.

[0114] The compressor provided in the embodiment of the present application includes a primary impeller, a secondary impeller, a primary diffuser corresponding to the primary impeller, and a secondary diffuser corresponding to the secondary impeller. One of the primary diffuser and the secondary diffuser is a diffuser in the embodiment of the present application whose driving part includes a driving rod, a cam, and an actuator, and the other includes a diffuser in the embodiment of the present application whose driving part includes a driving cylinder and a fluid pipeline.

[0115] For example, the driving part of the first-stage diffuser includes a driving rod 1401 , a cam 1301 and an actuator, and the driving part of the second-stage diffuser includes a driving cylinder 2200 and a fluid pipeline 2101 .

[0116] Using different independent driving modes for the two diffusers at different positions can realize flexible control of the primary diffuser and the secondary diffuser, avoiding the use of a single driving source (such as a motor) to control the two diffusers at the same time, resulting in a cumbersome transmission structure or increasing energy consumption due to adding an additional driving source (such as a motor) to the secondary diffuser.

[0117] In some embodiments of the compressor, at least one impeller includes a primary impeller and an adjustable guide vane structure arranged upstream of the primary impeller, at least one diffuser includes a primary diffuser corresponding to the primary impeller, the primary diffuser is the diffuser of the first aspect of the present application, and the driving part includes a driving rod, a cam and an actuator, the driving part of the diffuser is arranged in a linkage with the adjustable guide vane structure to drive the guide vane movement of the adjustable guide vane structure to change the fluid flow entering the primary impeller while driving the movable diffuser body part to move relative to the first stationary diffuser body part.

[0118] In the compressor of some embodiments, the driving part includes a driving ring 1304 , which is rotatably arranged around a rotation axis extending along the axial direction of the diffuser. The driving part is linked to the adjustable guide vane structure through the driving ring 1304 .

[0119] Among them, the connection relationship between the drive ring 1304 and the guide vane can refer to the driving connection relationship between the drive ring and the guide vane of the adjustable guide vane structure in the related art, and this application will not repeat it again.

[0120] The first-stage diffuser adopts a drive ring, a drive rod and a cam structure, which is conducive to compatibility with the adjustable guide vane structure between the compressor suction port and the first-stage impeller. The adjustable guide vane structure is used to adjust the flow rate of the working fluid of the compressor, such as the refrigerant flow rate. For example, the first-stage diffuser structure of the embodiment of the present application can realize the axial movement of the drive rod and the rotation of the guide vane with the help of the drive ring through mechanical transmission, thereby playing a role in controlling the flow rate.

[0121] When the space between the primary diffuser and the secondary diffuser is relatively limited, it is more suitable to arrange pipeline components to realize air pressure driving by driving the secondary diffuser pneumatically. For example, the driving cylinder 2200 and the fluid pipeline 2101 can be introduced as an air source from the vicinity of the compressor exhaust port.

[0122] An embodiment of the present application also provides a compressor, which includes a driving part of the embodiment of the present application, including a drive cylinder 2200 and a diffuser of a fluid pipeline 2101, and the fluid pipeline 2101 is connected to the outlet of the compressor to transport the gas working medium of the compressor to the drive cylinder as a pressurized fluid.

[0123] The gaseous working medium at the compressor outlet acts as a pressurized fluid to drive the piston 2211 of the drive cylinder 2200 to move, and the power of the compressor itself can be used to adjust the minimum flow area of ​​the diffuser.

[0124] For example, when the compressor of the embodiment of the present application is used in a refrigeration system, the fluid pipeline 2101 can be connected between the compressor outlet and the condenser, and the high-pressure gaseous refrigerant can be transported to the drive cylinder 2200 through the fluid pipeline 2101 and transported back from the drive cylinder 2200 to the refrigerant flow path of the refrigeration system, thereby using the high-pressure gaseous refrigerant as a pressurized fluid.

[0125] The following combination Figures 1 to 6 The diffuser and the compressor according to the embodiment of the present application are described in more detail.

[0126] like Figures 1 to 3 As shown, the driving portion of the first-stage diffuser in this embodiment includes a stationary shell 1200, a bushing 1405 fixed in the stationary shell 1200, a support ring 1406 fixed between the stationary shell 1200 and the bushing 1405, a first spring 1404, a pressure plate locking nut 1402, a pressure plate 1403, a driving rod 1401 axially movable in the stationary shell 1200, a gasket 1407, a first locking nut 1408, a first stationary diffuser body 1500, a movable diffuser body 1600, a second stationary diffuser body 1100, a cam 1301, a first connecting rod 1302, a driving shaft 1303, a driving ring 1304, a second connecting rod 1305, a key 1306 and a motor 1307.

[0127] The motor 1307 is a power source for realizing the operation of the first-stage diffuser. The output shaft of the motor 1307 is connected to the cam 1301 as the first cam through the key 1306 without relative rotation. At the same time, the output shaft of the motor 1307 is also connected to the first end of a first connecting rod 1302 without relative rotation to drive the cam 1301 and the first connecting rod 1302 to rotate. In this embodiment, only one cam 1301 is directly driven by the motor 1307 as the first cam and the corresponding first connecting rod 1302, and the remaining cams 1301 are connected to the corresponding first connecting rods 1302 through the drive shaft 1303 and the key 1306 without relative rotation.

[0128] One end of each second connecting rod 1305 is rotatably connected to the second end of the corresponding first connecting rod 1302, and the other end is rotatably connected to the driving ring 1304. Figure 3 As shown, both ends of the second connecting rod 1305 are connected to the corresponding first connecting rod 1302 and the driving ring 1304 through a universal joint. In this embodiment, the driving ring 1304 is a circular ring. Figure 4 Only a portion of the torus is schematically shown.

[0129] The working principle of the first-stage diffuser of this embodiment is described as follows: since the motor 1307 drives the cam 1301 and the first connecting rod 1302 directly connected to its output shaft as the first cam to rotate, during the rotation of the first connecting rod 1302, the second connecting rod 1305 connected thereto rotates accordingly, and the driving ring 1304 connected to the second connecting rod 1305 also rotates accordingly. During the rotation of the driving ring 1304, the other second connecting rods 1305 rotate driven by the driving ring 1304, and the other first connecting rods 1302 rotate driven by the corresponding second connecting rods 1305, thereby realizing the rotation of the other cams 1301 serving as the second cams, that is, realizing the synchronous rotation of all the cams 1301.

[0130] In this embodiment, the number of cams 1301 is 3. When the cam 1301 rotates 360°, it contacts the driving rod 1401. At this time, the driving rod 1401 moves along its own length direction, that is, the axial direction of the diffuser, and drives the movable diffuser body 1600 to approach or move away from the first stationary diffuser body 1500. It can be understood that when the cam 1301 is an eccentric wheel, the moving distance of the driving rod 1401 and the rotation angle of the cam 1301 change in a trigonometric function.

[0131] The stationary housing 1200 is provided with a receiving hole communicating with the left and right end surfaces, and the receiving hole extends along the axial direction of the diffuser. The specific shape of the stationary housing 1200 is not limited in this embodiment and will not be described in detail here.

[0132] The bushing 1405 is an annular cylinder with a groove on the inner wall surface, and is installed in the receiving hole in the stationary housing 1200 as a stationary component through interference fit. The support ring 1406 is installed in the groove on the inner wall surface of the bushing 1405, and is located between the drive rod 1401 and the bushing 1405. The support ring 1406 is used to support the drive rod 1401, and the material is preferably a material with a small sliding friction coefficient, such as polytetrafluoroethylene, so as to reduce the friction force on the drive rod 1401 during movement.

[0133] One end surface of the gasket 1407 contacts the bushing 1405 , and the other end surface contacts the movable diffuser body 1600 . The gasket 1407 serves as a limiter to determine the maximum distance that the movable diffuser body 1600 can be away from the first stationary diffuser body 1500 .

[0134] The first locking nut 1408 rigidly connects the driving rod 1401 to the active diffuser body 1600 .

[0135] The pressing plate 1403 is rigidly connected to the driving rod 1401 via the pressing plate locking nut 1402 .

[0136] The first spring 1404 is initially in a compressed state, with one end in contact with the stationary housing 1200 and the other end in contact with the pressure plate 1403 , providing elastic force to push the driving rod 1401 to drive the movable diffuser body 1600 away from the first stationary diffuser body 1500 .

[0137] The adjustment principle of the minimum flow area in the first-stage diffuser is as follows: when the flow channel width needs to be reduced, the motor 1307 drives all cams 1301 to rotate synchronously, so that the end face of the second end of the lateral driving rod 1401 on the circumferential surface of the cam 1301 that is relatively far away from its rotation center rotates, and the driving force of the motor 1307 overcomes the elastic force of the first spring 1404 and the friction of related components, etc., and pushes the driving rod 1401 and then drives the movable diffuser body 1600 to approach the first static diffuser body 1500, and the moving distance forms a functional mapping relationship with the rotation angle and eccentricity of the cam 1301. When the flow channel width needs to be expanded, the end face of the second end of the lateral driving rod 1401 on the circumferential surface of the cam 1301 that is relatively close to its rotation center rotates, and the first spring 1404 overcomes the friction of related components to push the pressure plate 1403, and then pushes the driving rod 1401 to move, driving the movable diffuser body 1600 away from the first static diffuser body 1500. When the active diffuser body 1600 and the bushing 1405 synchronously contact the two end surfaces of the gasket 1407 , the flow channel width reaches a maximum value.

[0138] The working fluid, such as the gaseous refrigerant, flowing out from the gas outlet of the first-stage impeller 1700 changes its flow passage width between the movable diffuser body 1600 and the first static diffuser body 1500, thereby improving the flow condition of the airflow at the compressor outlet and expanding the operating range of the compressor.

[0139] like Figure 1 , Figure 5 and Figure 6 As shown, the driving part of the secondary diffuser in this embodiment includes a driving cylinder 2200 and a fluid pipeline 2101. The driving cylinder 2200 is a cylindrical rotating body structure, and is fastened to the second static diffuser body 2100 by screws. In this embodiment, the number of driving cylinders 2200 is 3. In an embodiment not shown in the figure, the number of driving cylinders 2200 can be more or less. In some embodiments, preferably, the plurality of driving cylinders 2200 are evenly distributed along the circumference of the diffuser, so that the movable diffuser body 2100 can evenly bear the force.

[0140] The driving cylinders 2200 transmit pressurized fluid through the fluid pipeline 2101. The pressurized fluid is, for example, a high-pressure gaseous refrigerant medium. In order to ensure that the energy loss such as the resistance loss along the refrigerant during the transmission process is as small as possible and take into account the flow rate of the high-pressure refrigerant, the fluid pipeline 2101 can be a copper tube with an inner diameter of 10.4 mm.

[0141] Each driving cylinder 2200 has two connecting holes 2207, one connecting hole 2207 of one driving cylinder 2200 is connected to the connecting port 2102 through the fluid pipeline 2101, the other connecting hole 2207 is connected to the connecting port 2103 through the fluid pipeline 2101, and the connecting holes 2207 of the remaining driving cylinders 2200 are connected to each other through the fluid pipeline 2101. The connecting port 2102 and the connecting port 2103 are both arranged on the second static diffuser body 2100. The high-pressure gaseous refrigerant flows into the pipeline 2101 from the connecting port 2102 and passes through all the driving cylinders 2200 in turn before flowing out from the connecting port 2103, forming a circulating flow pipeline.

[0142] In this embodiment, the flow channel structure before the gaseous refrigerant flows in from the connecting port 2102 and the flow channel structure after it flows out from the connecting port 2103 is not limited, and the specific bending shape of the fluid pipeline 2101 is not limited.

[0143] like Figure 6 As shown, the driving cylinder 2200 mainly includes a cylinder body composed of a cylinder barrel 2202 and a cylinder cover 2205, a first guide ring 2203, a square ring for a hole 2204, a second spring 2206, a sealing ring 2209, a second guide ring 2210 and a piston 2211. The piston 2211 divides the inner cavity of the cylinder body into a first cavity 2208 and a second cavity. The pipe hole 2207 is connected to the first cavity 2208. The pressure stabilizing hole 2201 is connected to the second cavity.

[0144] The driving cylinder 2200 is generally in the form of a cylindrical rotating body structure, and is fastened to the second static diffuser body 2100 by screws. The cover plate 2205 is screwed to the cylinder barrel 2202. The cover plate 2205 is in the form of a two-section cylindrical rotating body structure, one section of the cylinder extends into the cylinder barrel 2202 and contacts the end surface of the piston 2211 in the non-working state.

[0145] The piston 2211 is placed inside the cylinder 2202 and includes a piston body and a piston rod. One end of the piston rod is connected to the piston body, and the other end of the piston rod is rigidly connected to the movable diffuser body 2400 through a second locking nut 2401.

[0146] The hole square ring 2204 and the first guide ring 2203 and the second guide ring 2210 made of filled polytetrafluoroethylene material are respectively arranged in the outer surface groove of the piston 2211 to ensure that the piston 2211 can move smoothly in the axial direction. The hole square ring 2204 can be composed of a wear-resistant PTFE bronze composite ring and an O-type rubber sealing ring. The O-type rubber sealing ring provides a pre-tightening force and can compensate for the wear of the PTFE bronze composite ring. The sealing ring 2209 is placed in the outer surface groove of the piston 2211 to prevent the high-pressure refrigerant gas in the first chamber 2208 from entering the diffuser flow channel.

[0147] The two ends of the second spring 2206 are respectively fixed in the slots of the piston 2211 and the cylinder 2202 and are always in a compressed state. The pressure-stabilizing hole 2201 communicates with the outside and the second chamber of the driving cylinder 2200 to allow the piston 2211 to move smoothly. The cover plate 2205, the piston 2211 and the cylinder 2202 together form the first chamber 2208.

[0148] In the working state, the high-pressure gaseous refrigerant introduced from the outside of the driving cylinder 2200 through the fluid pipeline 2101 enters the first chamber 2208 through the connecting hole 2207. In this embodiment, the number of connecting holes 2207 is 2, one of which enters the pressurized fluid and the other flows out the pressurized fluid. After the high-pressure refrigerant flows into the first chamber 2208, a pressure difference is formed at both ends of the piston 2211, thereby pushing the piston 2211 and the movable diffuser body 2400 connected to the piston 2211 to move toward the first static diffuser body 2300, and the fluid such as the gaseous refrigerant flowing out of the secondary impeller 2500 passes through the flow channel width between the movable diffuser body 2400 and the first static diffuser body 2300, thereby changing the minimum flow area of ​​the diffuser, improving the flow state of the fluid, and expanding the operating range of the compressor.

[0149] According to the above description, the diffuser and compressor provided in the embodiments of the present application can broaden the operating range of the compressor, and can fully utilize the pressure diffusion capacity of the diffuser even when the compressor is operating under a small load state, thereby improving the performance of the compressor.

[0150] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar parts can be referenced to each other, and for the sake of brevity, they will not be repeated in this article.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solution requested for protection in this application.

Claims

1. A diffuser, characterized in that: include: a first diffuser section including a first stationary diffuser body section; A second diffuser portion, arranged opposite to the first diffuser portion and forming a diffuser flow passage, comprises a movable diffuser body portion; and The driving portion is drivingly connected to the movable diffuser body portion and is configured to drive the movable diffuser body portion to move relative to the first stationary diffuser body portion to change the minimum flow area of ​​the diffuser flow channel.

2. The diffuser according to claim 1, characterized in that The movable diffuser body is an annular body coaxial with the axis of the diffuser, and the movable diffuser surface of the movable diffuser body facing the first stationary diffuser body includes a conical surface inclined toward the first stationary diffuser body from the gas inlet side to the gas outlet side of the diffuser.

3. The diffuser according to claim 2, characterized in that The inner circumferential surface of the annular body and the conical surface adopt a rounded transition.

4. The diffuser according to claim 1, characterized in that The second diffuser section comprises a second stationary diffuser body section, wherein: The movable diffuser body portion is located radially inward of the second stationary diffuser body portion; or A side of the second stationary diffuser body portion facing the first diffuser portion has a mounting groove, and the movable diffuser body portion is disposed in the mounting groove.

5. The diffuser according to any one of claims 1 to 4, characterized in that: The driving unit comprises: A driving rod (1401), wherein a first end of the driving rod (1401) is connected to a main body of the movable diffuser, and the driving rod (1401) is arranged to be reciprocatingly movable along the axial direction of the diffuser; A cam (1301) is rotatably arranged around a rotation axis fixed relative to the first stationary diffuser body, and an end surface of the second end of the driving rod (1401) abuts against a circumferential surface of the cam (1301); An actuator is drivingly connected to the cam (1301) to drive the cam (1301) to rotate around the rotation axis.

6. The diffuser according to claim 5, characterized in that The driving part comprises a plurality of driving rods (1401), a plurality of cams (1301) arranged in one-to-one correspondence with the plurality of driving rods (1401), and a transmission device; The actuator comprises at least one rotary actuation unit, the rotary actuation unit comprising an output shaft; The multiple cams (1301) include at least one first cam and at least one second cam, the at least one first cam is arranged in a one-to-one correspondence with the at least one rotary actuating unit, the first cam is coaxial with the output shaft of the corresponding rotary actuating unit and is connected without relative rotation, and the second cam is drivingly connected to the at least one rotary actuating unit via the transmission device.

7. The diffuser according to claim 6, characterized in that The transmission device comprises: A plurality of first connecting rods (1302) are arranged in one-to-one correspondence with the plurality of cams (1301), wherein the first ends of the first connecting rods (1302) are connected to the corresponding cams (1301) without relative rotation; A plurality of second connecting rods (1305) are arranged in one-to-one correspondence with the plurality of cams (1301), and a first end of the second connecting rod (1305) is rotatably connected to a corresponding second end of the first connecting rod (1302); A drive ring (1304), the drive ring (1304) being rotatably arranged around a rotation axis extending along the axial direction of the diffuser, and the second end of the second connecting rod (1305) being rotatably connected to the drive ring (1304).

8. The diffuser according to claim 7, characterized in that The drive ring (1304) is relatively stationary along the axial direction of the diffuser; and / or The first end and the second end of the second connecting rod (1305) are respectively connected to the first connecting rod (1302) and the driving ring (1304) via universal joints.

9. The diffuser according to claim 5, characterized in that The driving portion comprises a driving rod mounting portion, the driving rod mounting portion comprises a stationary shell (1200) fixed relatively to the first stationary diffuser body portion, the stationary shell (1200) has a receiving hole therein, the receiving hole extends along the axial direction of the diffuser, and the driving rod (1401) is located in the receiving hole.

10. The diffuser according to claim 9, characterized in that The drive rod mounting portion further comprises a bushing (1405), wherein the bushing (1405) extends along the axial direction of the diffuser and is arranged between a hole wall of the accommodating hole and the drive rod (1401).

11. The diffuser according to claim 9, characterized in that The drive rod mounting portion further comprises a bushing (1405), the bushing (1405) extending along the axial direction of the diffuser and being arranged between the hole wall of the accommodating hole and the drive rod (1401), and the mounting portion further comprises a support ring (1406), the support ring (1406) extending along the axial direction of the diffuser, being arranged between the bushing (1405) and the drive rod (1401) and being located in a groove on the bushing (1405); or The mounting portion further comprises a support ring, which extends along the axial direction of the diffuser, is arranged between the hole wall of the accommodating hole and the driving rod, and is located in a groove on the hole wall of the accommodating hole.

12. The diffuser according to claim 5, characterized in that The driving portion further comprises a driving rod resetting portion, wherein the driving rod resetting portion is configured to continuously apply a force to the driving rod (1401) so that an end surface of the second end thereof abuts against a circumferential surface of the cam (1301).

13. The diffuser according to claim 9, characterized in that The driving portion further comprises a driving rod resetting portion, the driving rod resetting portion being configured to continuously apply a force to the driving rod (1401) so that the end surface of the second end thereof abuts against the circumferential surface of the cam (1301); The driving rod resetting portion comprises a first spring (1404), and two ends of the first spring (1404) act on the driving rod (1401) and the stationary housing (1200) respectively.

14. The diffuser according to any one of claims 1 to 4, characterized in that The driving unit comprises: A driving cylinder (2200) comprising a cylinder body and a piston (2211), wherein the piston (2211) comprises a piston body and a piston rod, wherein the cylinder body is relatively fixed to the first stationary diffuser body portion, the piston body is reciprocatingly disposed in the cylinder body along the axial direction of the diffuser, the first end of the piston rod is connected to the piston body, and the second end of the piston rod is connected to the movable diffuser body portion; and A fluid pipeline (2101) is connected to the cylinder body and is configured to input and output fluid to the drive cylinder (2200) to drive the piston (2211) to reciprocate relative to the cylinder body, thereby driving the movable diffuser body part to move relative to the first stationary diffuser body part.

15. The diffuser according to claim 14, characterized in that The inner cavity of the cylinder body is divided into a first cavity (2208) and a second cavity by the piston body, and the fluid pipeline (2101) is in communication with the first cavity (2208); The driving cylinder (2200) further comprises a second spring (2206), wherein the second spring (2206) is disposed in the second chamber and is configured to apply a force to the piston body that causes the first chamber (2208) to tend to shrink.

16. The diffuser according to claim 15, characterized in that The cylinder body is also provided with a pressure-stabilizing hole (2201) communicating with the second chamber, and the pressure-stabilizing hole (2201) is configured to communicate the second chamber with the outside of the driving cylinder (2200).

17. A compressor, characterized in that: The invention comprises at least one impeller and at least one diffuser corresponding to the at least one impeller, wherein the at least one diffuser comprises the diffuser according to any one of claims 1 to 16.

18. The compressor according to claim 17, characterized in that The at least one impeller includes a primary impeller and a secondary impeller, the at least one diffuser includes a primary diffuser corresponding to the primary impeller and a secondary diffuser corresponding to the secondary impeller, and the primary diffuser and the secondary diffuser are both the diffusers according to any one of claims 1 to 16.

19. The compressor according to claim 18, characterized in that One of the primary diffuser and the secondary diffuser is the diffuser according to any one of claims 5 to 13, and the other is the diffuser according to any one of claims 14 to 16.

20. The compressor according to claim 17, characterized in that The at least one impeller includes a primary impeller and an adjustable guide vane structure arranged upstream of the primary impeller, the at least one diffuser includes a primary diffuser corresponding to the primary impeller, the primary diffuser is the diffuser according to any one of claims 5 to 13, and the driving portion of the diffuser is arranged in linkage with the adjustable guide vane structure to drive the guide vane movement of the adjustable guide vane structure to change the fluid flow entering the primary impeller while driving the movable diffuser body portion to move relative to the first stationary diffuser body portion.

21. The compressor according to claim 20, characterized in that The driving portion comprises a driving ring (1304), the driving ring (1304) being rotatably arranged around a rotation axis extending along the axial direction of the diffuser, and the driving portion is linked to the adjustable guide vane structure through the driving ring (1304).

22. The compressor according to claim 17, characterized in that The compressor comprises the diffuser according to any one of claims 14 to 16, and the fluid pipeline (2101) is connected to the outlet of the compressor to deliver the gas working medium of the compressor to the driving cylinder (2200) as a pressurized fluid.

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