A compressor with adjustable inlet guide vane and centrifugal compressor

Abstract

This application proposes an adjustable inlet guide vane for a compressor and a centrifugal compressor. The adjustable inlet guide vane includes: an inlet guide vane; a cylindrical structure for mounting the inlet guide vane; a linkage mechanism including a driving link, a drive ring, and a driven link; the driving link rotates synchronously with the driving blade, and a first cam follower is provided on the driving link; the drive ring is sleeved on the outside of the cylindrical structure, and the drive ring has multiple slotted holes; the driven link drives the driven blade to rotate, and a second cam follower is provided on the driven link; the first cam follower and the second cam follower extend into the slotted holes one by one and slide in the slotted holes, so that when the driving link rotates, the sliding of the first cam follower in the slotted hole drives the drive ring to perform linear motion, and the linearly moving drive ring drives the second cam follower to rotate through the sliding of the second cam follower in the slotted hole, so as to achieve synchronous rotation of the driven blade and the driving blade.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and in particular to an adjustable inlet guide vane of a compressor and a centrifugal compressor. Background Art

[0002] During actual operation, centrifugal compressors usually need to work within a certain range of operating conditions, rather than just at one operating point. By adjusting the inlet guide vanes, the adjustment performance of the compressor can be improved, thereby saving energy. At present, the adjustment of the inlet guide vanes adopts wire drive and gear drive. However, wire drive has problems such as inaccurate transmission caused by wire deformation and short wire life; the gear drive design leads to problems such as increased overall cost of the mechanism, complex assembly, and long production cycle. Summary of the invention

[0003] In view of this, the present application provides a compressor adjustable inlet guide vane, which improves transmission efficiency and transmission accuracy while reducing manufacturing costs. In addition, the present application also provides a centrifugal compressor including the above-mentioned compressor adjustable inlet guide vane.

[0004] In order to achieve the above objectives, this application provides the following technical solutions: A compressor adjustable inlet guide vane, comprising: Inlet guide vanes, including active vanes and driven vanes; A cylinder structure, used for installing the inlet guide vane; The connecting rod mechanism comprises an active connecting rod, a driving ring and a driven connecting rod; the active connecting rod rotates synchronously with the active blade, and a first cam follower is arranged on the active connecting rod; the driving ring is sleeved on the outer side of the cylinder structure, and a plurality of strip-shaped holes are opened on the driving ring; the driven connecting rod drives the driven blade to rotate, and a second cam follower is arranged on the driven connecting rod; Among them, the first cam follower and the second cam follower extend into the strip hole one by one and slide in the strip hole, so that when the active connecting rod rotates, the first cam follower slides in the strip hole to drive the driving ring to perform linear motion, and the linearly moving driving ring drives the second cam follower to rotate through the sliding of the second cam follower in the strip hole, so as to realize the synchronous rotation of the driven blade and the active blade.

[0005] Optionally, in the above-mentioned adjustable inlet guide vane of the compressor, in the circumferential direction of the cylinder structure, the displacement of the active blade driven by the first cam follower to rotate 90 degrees is L1, the displacement of the driven blade driven by the second cam follower to rotate 90 degrees is L2, the opening length of the strip hole is L3, and L1≤L3, L2≤L3.

[0006] Optionally, the above-mentioned adjustable inlet guide vane of the compressor further includes a guide rod, a fixed plate and an inlet end plate, the cylinder structure includes an axially distributed inlet end and an outlet end, the fixed plate is sleeved on the outlet end, the inlet end plate is sleeved on the inlet end, the guide rod is connected between the fixed plate and the inlet end plate, and is used to guide the linearly moving drive ring.

[0007] Optionally, in the above-mentioned adjustable inlet guide vane of the compressor, a lubricating part with a lubricating function is provided between the guide rod and the drive ring.

[0008] Optionally, in the above-mentioned adjustable inlet guide vane of the compressor, the active blades rotate under the drive of a driving member, and the driving member drives the active blades to rotate through an output shaft. The drive ring is provided with a circumferential opening, and the opening is used to avoid the output shaft.

[0009] Optionally, in the above-mentioned adjustable inlet guide vane of the compressor, a rotating member is provided on each of the first cam follower and the second cam follower, and the first cam follower and the second cam follower are in rotational contact with the inner wall of the strip hole through the rotating member.

[0010] Optionally, the above-mentioned adjustable inlet guide vane of the compressor further includes a fastening assembly for connecting the fixing plate and the intake end, and the fastening assembly includes a fastener and an elastic gasket through which the fastener passes.

[0011] Optionally, in the above-mentioned adjustable inlet guide vane of the compressor, the active connecting rod and the active blade are circumferentially positioned by a first circumferential locking structure, the first circumferential locking structure includes a first locking plane formed by cutting the circumferential side wall of the active connecting rod, and a second locking plane formed by cutting the active blade, the second locking plane is in contact with the first locking plane, and / or a first abutment is provided on the active connecting rod, the active connecting rod is passed through the first abutment and abuts against the active blade, so as to limit the relative rotation of the active blade and the active connecting rod; The driven connecting rod and the driven blade are circumferentially positioned by a second circumferential locking structure, the second circumferential locking structure includes a third locking plane formed by cutting the circumferential side wall of the driven connecting rod, and a fourth locking plane formed by cutting the driven blade, the fourth locking plane is in contact with the third locking plane, and / or a second abutment is passed through the driven connecting rod, the driven connecting rod is passed through the second abutment and abuts against the driven blade, so as to limit the relative rotation of the driven blade and the driven connecting rod.

[0012] Optionally, in the above-mentioned adjustable inlet guide vane of the compressor, a shaft retaining spring is provided at the connection between the active connecting rod and the active blade, and a shaft retaining spring is provided at the connection between the driven connecting rod and the driven blade.

[0013] A centrifugal compressor employs the adjustable inlet guide vane of the compressor as described in any one of the above items.

[0014] The present application provides an adjustable inlet guide vane of a compressor, wherein an active connecting rod rotates synchronously with an active blade, and at the same time, a first cam follower arranged on the active connecting rod slides in a strip hole formed in a driving ring to convert the rotational motion of the active blade into a linear motion of the driving ring. When the driving ring performs linear motion, the driving ring can drive the driven blade to rotate through the sliding of the second cam follower in the strip hole, thereby realizing the synchronous rotation of the driven blade driven by the rotation of the active blade, so as to realize the adjustment of the inlet guide vane of the compressor. The transmission of the rotational motion by a connecting rod mechanism improves the transmission efficiency and accuracy, and reduces the manufacturing cost, compared with the wire transmission and gear transmission in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1 A front view of the adjustable guide vane of the compressor provided in an embodiment of the present application; Figure 2 for Figure 1 AA section view; Figure 3 A side view of an adjustable guide vane of a compressor provided in an embodiment of the present application; Figure 4 for Figure 1 A partial enlarged view of Figure 5 A schematic diagram of the structure of the adjustable guide vanes of the compressor provided in an embodiment of the present application.

[0017] exist Figure 1-Figure 5 middle: 1. Inlet guide vane; 11. Active blade; 12. Driven blade; 2. Cylinder structure; 3. connecting rod mechanism; 31. active connecting rod; 32. driving ring; 33. driven connecting rod; 311. first cam follower; 331. second cam follower; 321. strip hole; 4. Guide rod; 5. Fixing plate; 6. Inlet end plate; 7. Lubricating member; 8. Driving member; 9. Output shaft; 10. Fastening assembly; 101. Fastener; 102. Elastic gasket; 110. First abutment member; 120. Second abutment member; 13. Oil-free bearing. DETAILED DESCRIPTION

[0018] The present application provides a compressor adjustable inlet guide vane, which improves transmission efficiency and transmission accuracy while reducing manufacturing costs. In addition, the present application also provides a centrifugal compressor including the above compressor adjustable inlet guide vane.

[0019] 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, not all of the embodiments. 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.

[0020] like Figure 1-Figure 5 As shown, an embodiment of the present application provides an adjustable inlet guide vane of a compressor, including an inlet guide vane 1, a cylinder structure 2 on which the inlet guide vane 1 is provided, and a connecting rod mechanism 3, wherein an active connecting rod 31 is connected to the shaft portion of an active blade 11, and a driven connecting rod 33 is connected to the shaft portion of a driven blade 12, and the inlet guide vane 1 includes an active blade 11 and a driven blade 12, wherein the active blade 11 is used to be driven and rotated by a driving member 8 of the compressor.

[0021] It should be noted that both the active blade 11 and the driven blade 12 include a shaft portion and a blade portion connected to the shaft portion, and each active blade 11 and each driven blade 12 rotates around its own shaft portion.

[0022] Specifically, the connecting rod mechanism 3 includes an active connecting rod 31, a driven connecting rod 33 and a driving ring 32, wherein the active connecting rod 31 is provided with a first cam follower 311, the driven connecting rod 33 is provided with a second cam follower 331, and the driving ring 32 is provided with a strip hole 321, and the number of the strip holes 321 is equal to the sum of the number of the first cam followers 311 and the second cam followers 331, so that the first cam followers 311 and the second cam followers 331 can extend into the strip holes 321 one by one and slide in the strip holes 321, so as to When the active connecting rod 31 rotates, the rotational motion of the active connecting rod 31 is converted into the linear motion of the driving ring 32 through the sliding of the first cam follower 311 in the strip hole 321, and the linear motion of the driving ring 32 is converted into the rotational motion of the driven blade 12 through the sliding of the second cam follower 331 in the strip hole 321, so as to realize the synchronous rotation of the active blade 11 and the driven blade 12 to adjust the inlet guide vane 1 of the compressor. It can be seen that the structure of the connecting rod mechanism 3 is simple, and there is no deformed component in the transmission process.

[0023] It can be understood that when the output shaft 9 is driven to rotate by the driving member 8 to drive the active blade 11 to rotate around itself, the rotational force synchronously drives the active connecting rod 31 to rotate (such as Figure 2 As shown, since the active connecting rod 31 is connected to the active blade 11), at this time, the first cam follower 311 slides in the strip hole 321, and synchronously drives the driving ring 32 to perform linear motion. At this time, the linear motion driving ring 32 synchronously drives the rotation of the driven connecting rod 33 through the sliding of the second cam follower 331 in the strip hole 321. Since the driven connecting rod 33 is connected to the driven blade 12, the linear motion driving ring 32 drives each driven blade 12 to rotate around itself, that is, through the drive of a driving member 8, multiple blades distributed on the circumference of the cylindrical structure 2 can rotate synchronously around themselves.

[0024] In this way, the connecting rod mechanism 3 is used for transmission, which avoids the problems of inaccurate transmission and short life of the wire caused by wire deformation, and also avoids the problem of complex and high cost of gear transmission assembly, thereby improving transmission efficiency and transmission accuracy and reducing manufacturing costs.

[0025] In a certain example, the active connecting rod 31 and the driven connecting rod 33 have the same structure, the first cam follower 311 and the second cam follower 331 have the same structure, and the first cam follower 311 is located at the end of the active connecting rod 31 away from the active connecting rod 31 and the active blade 11 is connected, and the second cam follower 331 is located at the end of the driven connecting rod 33 away from the driven connecting rod 33 and the driven blade 12 is connected. It can be understood that the active connecting rod 31 with the first cam follower 311 and the driven connecting rod 33 with the second cam follower 331 have the same structure, that is, the active connecting rod 31 and the driven connecting rod 33 can be set as the same parts. In this way, when assembling the connecting rod mechanism 3, there is no need to distinguish between the active connecting rod 31 and the driven connecting rod 33, which saves installation time. In addition, because the active connecting rod 31 and the driven connecting rod 33 have the same structure, the structure of the connecting rod mechanism 3 is further simplified.

[0026] It should be noted that if Figure 1 As shown, the shaft of the active blade 11 is inserted into the oil-free bearing 13 to reduce the wear of the active blade 11 , and correspondingly, the shaft of the driven blade 12 is inserted into the oil-free bearing 13 (not shown in the figure).

[0027] Furthermore, in the circumferential direction of the cylinder structure 2, the displacement of the active blade 11 driven by the first cam follower 311 to rotate 90 degrees is L1, the displacement of the driven blade 12 driven by the second cam follower 331 to rotate 90 degrees is L2, the length of the strip hole 321 is L3, and L1≤L3, L2≤L3. In order to better adjust the inlet flow of the compressor, the active blade 11 and the driven blade 12 can be rotated at least 90 degrees so that the inlet guide vane 1 can rotate from the first state to the second state. The first state refers to the state in which the blade portion of the inlet guide vane 1 is perpendicular to the inlet end mentioned later to allow the maximum intake volume. The second state refers to the state in which the blade portion of the inlet guide vane 1 is parallel to the inlet end mentioned later to block the inlet end. In the process from the first state to the second state, when the inlet guide vane 1 is at an intake volume that meets the demand, the rotation of the inlet guide vane 1 can be stopped. When the drive ring 32 performs linear motion, the second cam follower 331 slides in the strip hole 321. In order to make the driven blade 12 rotate 90 degrees synchronously with the active blade 11, the opening length of the strip hole 321 in the circumferential direction is greater than or equal to the displacement of the active blade 11 rotating 90 degrees, and also greater than the displacement of the driven blade 12 rotating 90 degrees. In this way, the intake volume of the compressor can be adjusted more flexibly and reliably.

[0028] It should be noted that L1 and L2 may be equal or unequal.

[0029] In some optional embodiments, it further includes a guide rod 4, a fixed plate 5 and an air inlet end plate 6. The cylinder structure 2 includes an air inlet end and an air outlet end distributed axially. The fixed plate 5 is sleeved on the air outlet end, and the air inlet end plate 6 is sleeved on the air inlet end. The guide rod 4 is connected between the fixed plate 5 and the air inlet end plate 6, and is used to guide the linear motion drive ring 32. It should be noted that the air inlet end plate 6 is a part of the cylinder structure 2 and is arranged close to the air inlet end. The guide rod 4 can be arranged on the outside of the drive ring 32 to clamp the outside of the drive ring 32 through multiple guide rods 4; the guide rod 4 can also be arranged on the inside of the drive ring 32 to abut the inside of the drive ring 32 through multiple guide rods 4; the present application preferably, the guide rod 4 passes through the upper and lower surfaces of the drive ring 32, and is provided with multiple guide rods to better guide the linear motion of the drive ring 32, so as to improve the accuracy of the transmission.

[0030] The guide rod 4 is a common structure on the market, such as a chrome-plated rod, which can meet the requirements by simple processing, saving both cost and time.

[0031] It should be noted that the guide rod 4 is connected to the fixing plate 5 and the air intake end plate 6 by screws.

[0032] In some other optional embodiments, the fixing plate 5 may not be mounted on the air inlet end. For example, the fixing plate 5 may include multiple pieces, and the multiple fixing plates 5 are connected to the air inlet end via screws, thereby saving the use cost of the fixing plates 5.

[0033] Furthermore, a lubricating member 7 with a lubricating function is provided between the guide rod 4 and the drive ring 32. When the drive ring 32 performs linear motion along the guide rod 4, both the drive ring 32 and the guide rod 4 will be worn. Providing the lubricating member 7 between the guide rod 4 and the drive ring 32 can reduce the wear and increase the service life of the drive ring 32 and the guide rod 4.

[0034] Preferably, the lubricating part 7 of the present application is an oil-free bushing, which has a self-lubricating design and does not require frequent maintenance or lubrication, which greatly reduces maintenance costs and maintenance time. In addition, the oil-free bushing is thin, which is suitable for compact design and helps save space.

[0035] In some optional embodiments, the active blade 11 rotates under the drive of the driving member 8, and the driving member 8 drives the active blade 11 to rotate through the output shaft 9, and the driving ring 32 is provided with a circumferential opening, and the opening is used to avoid the output shaft 9. The output shaft 9 is connected to the active blade 11 and is used to drive the active blade 11 to rotate. When the active blade 11 rotates, the driving ring 32 moves up and down. At this time, in order to avoid interference between the driving ring 32 and the output shaft 9, an opening is provided at the relative position of the driving ring 32 and the output shaft 9.

[0036] In some other optional embodiments, the drive ring 32 may not be provided with an opening in the circumferential direction, but the relative position of the drive ring 32 and the output shaft 9 may be set to a recessed portion to avoid interference with the output shaft 9 when the drive ring 32 moves up and down.

[0037] In some optional embodiments, the first cam follower 311 and the second cam follower 331 are both provided with a rotating member, and the first cam follower 311 and the second cam follower 331 are in rotational contact with the inner wall of the strip hole 321 through the rotating member. The rotating member can be a bearing, and the sliding friction between the first cam follower 311, the second cam follower 331 and the strip hole 321 is converted into rolling friction, thereby reducing the movement resistance and saving energy.

[0038] In some optional embodiments, a fastening assembly 10 for connecting the fixing plate 5 and the air inlet end is further included, and the fastening assembly 10 includes a fastener 101 and an elastic gasket 102 through which the fastener 101 is passed. The fastener 101 can be a common screw, bolt, etc. on the market. Preferably, the fastener 101 is a hexagon socket cylindrical screw, and the elastic gasket 102, the fixing plate 5 and the air inlet end are passed through the hexagon socket cylindrical screw in sequence to achieve a fixed connection between the fixing plate 5 and the air inlet end. The provision of the elastic gasket 102 is conducive to alleviating the vibration between the hexagon socket cylindrical screw and the fixing plate 5, and is also conducive to the fastening connection between the hexagon socket cylindrical screw and the fixing plate 5.

[0039] In some other optional embodiments, in addition to the above-mentioned connection method between the fixing plate 5 and the air inlet end, the fixing plate 5 may also be welded to the air inlet end.

[0040] In some optional embodiments, the active connecting rod 31 and the active blade 11 are circumferentially positioned by a first circumferential locking structure, and the first circumferential locking structure includes a first locking plane formed by cutting the circumferential side wall of the active connecting rod 31, and a second locking plane formed by cutting the active blade 11, and the second locking plane is in contact with the first locking plane. It should be noted that the active connecting rod 31 is sleeved on the shaft body of the active blade 11. The first locking plane is opposite to the second locking plane, and the number of the first locking planes is equal to the number of the second locking planes. For example, when the cross-section of the inner wall of the active connecting rod 31 is a pentagon, the shaft body of the active blade 11 is cut into a pentagon matching therewith, thereby avoiding relative rotation between the active connecting rod 31 and the active blade 11.

[0041] And / or, a first abutment 110 is provided on the active connecting rod 31, and the active connecting rod 31 is provided through the first abutment 110 and abuts the active blade 11 to limit the relative rotation between the active blade 11 and the active connecting rod 31. The first abutment 110 can be a screw, a bolt or a pin, etc. In a certain example, the first abutment 110 is a flat-end set screw. The active connecting rod 31 is provided through the first abutment 110 and abuts the shaft portion of the active blade 11, which can better limit the relative rotation between the active connecting rod 31 and the active blade 11. It should be noted that, preferably, the present application further adopts a method of providing the active connecting rod 31 through the first abutment 110 and abutting the active blade 11 on the basis of the first circumferential locking structure, so as to circumferentially limit the active connecting rod 31 and the active blade 11.

[0042] The driven connecting rod 33 and the driven blade 12 are circumferentially positioned by a second circumferential locking structure, and the second circumferential locking structure includes a third locking plane formed by cutting the circumferential side wall of the driven connecting rod 33, and a fourth locking plane formed by cutting the driven blade 12, and the fourth locking plane fits the third locking plane. It should be noted that the driven connecting rod 33 is sleeved on the shaft body of the driven blade 12. The third locking plane is opposite to the fourth locking plane, and the number of the third locking planes is equal to the number of the fourth locking planes. For example, when the cross-section of the inner wall of the driven connecting rod 33 is a quadrilateral, the shaft body of the active blade 11 is cut into a quadrilateral matching therewith, thereby avoiding the relative rotation of the active connecting root and the active blade 11.

[0043] And / or, a second abutment 120 is provided on the driven connecting rod 33, and the driven connecting rod 33 is penetrated by the second abutment 120 and abuts against the driven blade 12, so as to limit the relative rotation between the driven blade 12 and the driven connecting rod 33. The second abutment 120 can be a screw, a bolt or a pin, etc. In a certain example, the first abutment 110 is a flat-end set screw. The second abutment 120 is provided to penetrate the driven connecting rod 33 and abut against the shaft body of the driven blade 12, so as to better limit the relative rotation between the driven connecting rod 33 and the driven blade 12. It should be noted that, in the present application, preferably, on the basis of the second circumferential retaining structure, the second abutment 120 is further provided to penetrate the driven connecting rod 33 and abut against the driven blade 12, so as to circumferentially limit the driven connecting rod 33 and the driven blade 12.

[0044] It should be noted that the number of first stopping planes cut on the inner wall of the active connecting rod 31 can also be one, and the number of third stopping planes cut on the inner wall of the driven connecting rod 33 can also be one. Of course, the number of first stopping planes and the number of third stopping planes can be equal or unequal.

[0045] In some optional embodiments, a shaft retaining spring is provided at the connection between the active connecting rod 31 and the active blade 11, and a shaft retaining spring is provided at the connection between the driven connecting rod 33 and the driven blade 12. The provision of the shaft retaining spring can prevent the active connecting rod 31 from axially moving on the active blade 11, and can prevent the driven connecting rod 33 from axially moving on the driven blade 12, so as to ensure the stability and reliability of the connection.

[0046] In some other optional embodiments, the connection between the active connecting rod 31 and the active blade 11 is not provided with a shaft retaining spring, but with a spiral retaining ring or an internally toothed conical spring washer.

[0047] In the present application, the connecting rod mechanism 3 is constructed of standard parts on the basis of ensuring accurate transmission, which can firstly ensure the control of product quality and secondly save production costs.

[0048] In addition, the embodiment of the present application also provides a centrifugal compressor, which includes the above-mentioned adjustable inlet guide vanes of the compressor. For the beneficial effects of the centrifugal compressor brought by the above-mentioned adjustable inlet guide vanes of the compressor, please refer to the above-mentioned description of the adjustable inlet guide vanes of the compressor, which will not be repeated here.

[0049] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0050] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0051] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0052] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0053] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0054] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A compressor adjustable inlet guide vane, characterized in that: include: An inlet guide vane (1), comprising an active blade (11) and a driven blade (12); A cylinder structure (2) used for installing the inlet guide vane (1); The connecting rod mechanism (3) comprises an active connecting rod (31), a driving ring (32) and a driven connecting rod (33); the active connecting rod (31) rotates synchronously with the active blade (11), and a first cam follower (311) is provided on the active connecting rod (31); the driving ring (32) is sleeved on the outer side of the cylindrical structure (2), and a plurality of strip-shaped holes (321) are formed on the driving ring (32); the driven connecting rod (33) drives the driven blade (12) to rotate, and the driven connecting rod (33) is provided with a second cam follower (331); The first cam follower (311) and the second cam follower (331) are extended into the strip hole (321) one by one and slide in the strip hole (321), so that when the active connecting rod (31) rotates, the first cam follower (311) slides in the strip hole (321), thereby driving the driving ring (32) to perform linear motion, and the linearly moving driving ring (32) drives the second cam follower (331) to rotate through the sliding of the second cam follower (331) in the strip hole (321), so as to realize the synchronous rotation of the driven blade (12) and the active blade (11).

2. The adjustable inlet guide vane of the compressor according to claim 1, characterized in that: In the circumferential direction of the cylindrical structure (2), the first cam follower (311) drives the active blade (11) to rotate 90 degrees with a displacement of L1, the second cam follower (331) drives the driven blade (12) to rotate 90 degrees with a displacement of L2, the opening length of the strip hole (321) is L3, and L1≤L3, L2≤L3.

3. The adjustable inlet guide vane of the compressor according to claim 1, characterized in that: It also includes a guide rod (4), a fixed plate (5) and an air inlet end plate (6), the cylinder structure (2) includes an air inlet end and an air outlet end which are axially distributed, the fixed plate (5) is sleeved on the air outlet end, the air inlet end plate (6) is sleeved on the air inlet end, the guide rod (4) is connected between the fixed plate (5) and the air inlet end plate (6), and is used to guide the linearly moving drive ring (32).

4. The adjustable inlet guide vane of the compressor according to claim 3, characterized in that: A lubricating member (7) having a lubricating function is provided between the guide rod (4) and the drive ring (32).

5. The adjustable inlet guide vane of the compressor according to claim 1, characterized in that: The active blade (11) rotates under the drive of the driving member (8), and the driving member (8) drives the active blade (11) to rotate via an output shaft (9). The driving ring (32) is provided with a circumferential opening, and the opening is used to avoid the output shaft (9).

6. The adjustable inlet guide vane of the compressor according to claim 1, characterized in that: The first cam follower (311) and the second cam follower (331) are both provided with a rotating member, and the first cam follower (311) and the second cam follower (331) are in rotational contact with the inner wall of the strip-shaped hole (321) through the rotating member.

7. The adjustable inlet guide vane of the compressor according to claim 3, characterized in that: It also includes a fastening assembly (10) for connecting the fixing plate (5) and the air inlet end, wherein the fastening assembly (10) includes a fastener (101) and an elastic gasket (102) through which the fastener (101) passes.

8. The adjustable inlet guide vane of the compressor according to claim 1, characterized in that: The active connecting rod (31) and the active blade (11) are circumferentially positioned by a first circumferential locking structure, wherein the first circumferential locking structure comprises a first locking plane formed by cutting a circumferential side wall of the active connecting rod (31), and a second locking plane formed by cutting the active blade (11), wherein the second locking plane is in contact with the first locking plane, and / or a first abutment member (110) is provided on the active connecting rod (31), and the active connecting rod (31) is passed through the first abutment member (110) and abuts against the active blade (11), so as to limit relative rotation between the active blade (11) and the active connecting rod (31); The driven connecting rod (33) and the driven blade (12) are circumferentially positioned by a second circumferential locking structure, wherein the second circumferential locking structure includes a third locking plane formed by cutting the circumferential side wall of the driven connecting rod (33), and a fourth locking plane formed by cutting the driven blade (12), wherein the fourth locking plane is in contact with the third locking plane, and / or a second abutment member (120) is passed through the driven connecting rod (33), and the driven connecting rod (33) is passed through the second abutment member (120) and abuts against the driven blade (12) to limit the relative rotation of the driven blade (12) and the driven connecting rod (33).

9. The adjustable inlet guide vane of the compressor according to claim 1, characterized in that: A shaft retaining spring is provided at the connection between the active connecting rod (31) and the active blade (11), and a shaft retaining spring is provided at the connection between the driven connecting rod (33) and the driven blade (12).

10. A centrifugal compressor, characterized in that: Its application is the adjustable inlet guide vane of the compressor as described in any one of claims 1-9.

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