Impeller assembly and compressor equipped with the same

Abstract

The present invention relates to an impeller assembly and a compressor provided with the same, the impeller assembly comprising: an impeller, having a front end face and a rear end face arranged opposite to each other in the direction of the central axis of the impeller, the impeller being provided with an impeller center hole connecting the front end face and the rear end face; a drive shaft, one end of the drive shaft being inserted into the impeller center hole from the rear end face, and one end of the drive shaft being inserted into the impeller center hole being provided with a drive shaft center hole; a compression gasket, one end of the compression gasket being inserted into the impeller center hole from the front end face, and the other end of the compression gasket being abutted against the front end face; a locking member, the locking member comprising a locking head and a locking rod connected to one end of the locking head, the locking rod passing through the compression gasket and being inserted into the drive shaft center hole, and the locking head being abutted against the compression gasket. The above-mentioned impeller assembly is convenient for disassembly and assembly, and realizes reliable positioning and locking, thereby simplifying the disassembly and assembly process of the compressor provided with the impeller assembly and improving the operating reliability of the compressor.

Description

Technical Field

[0001] The present invention relates to the field of compression devices, in particular to an impeller assembly and a compressor provided with the impeller assembly. Background Art

[0002] A centrifugal compressor is a rotary mechanical device that relies on high speed to generate pressure difference to perform work. Its normal operating speed is between 5000RPM-50000RPM. At high speed, the strength, positioning and locking of the rotating shaft parts have a vital impact on the operation of the compressor. The impeller, as the most important component of the rotating shaft parts, is responsible for generating centrifugal force to compress the gas. Its positioning and locking method is particularly important for the operation of the compressor.

[0003] At present, the commonly used impeller positioning and locking methods include:

[0004] 1. Fix with key and lock nut. Figure 1 As shown, the rear end face of the impeller hub fits with the shoulder of the drive shaft to realize the axial positioning of the impeller, the center hole of the impeller hub cooperates with the outer cylindrical surface of the drive shaft to realize the radial positioning of the impeller, and the impeller is key-connected with the drive shaft to realize the power transmission from the drive shaft to the impeller. The locking nut is sleeved on the drive shaft and abuts against the front end face of the impeller hub, thereby playing the role of axial anti-loosening. The use of this positioning and locking method to fix the impeller has the advantages of low processing cost and convenient disassembly and assembly. However, at the same time, the front end of the drive shaft extends longer, resulting in greater deflection of the shaft system, and the impeller is prone to large shaking and abnormal friction of the comb teeth seal during high-speed rotation. Moreover, there is a large stress concentration at the root of the keyway of the drive shaft and the impeller, which weakens the strength of the drive shaft and the impeller, and the concentricity of the impeller and the drive shaft is poor. In addition, the drive shaft extending out of the front end face of the impeller affects the distribution of gas at the impeller inlet and affects the aerodynamic performance of the impeller.

[0005] 2. Fix with lock nut. Figure 2 As shown, the drive shaft is inserted into the center hole of the impeller, and the locking nut passes through the front end face of the impeller and is inserted into the drive shaft. The impeller is fixed by this positioning and locking method, which has the advantages of low processing cost and convenient disassembly and assembly. However, at the same time, after the impeller has been disassembled and assembled many times, the friction between the front end face of the impeller and the matching surface of the locking nut is obvious and there are obvious burrs. In addition, due to the lack of reliable positioning of the locking nut, the locking nut is slightly tilted during the assembly process, which causes the impeller to be squeezed and deformed, causing the impeller to locally jump during rotation. There is also a sudden transition between the locking nut and the air inlet of the impeller, which is not conducive to the operating performance of the impeller and the noise control during operation.

[0006] 3. Tighten the locking nut by hydraulic tension. Figure 3As shown, the drive shaft is directly inserted into the impeller, and the locking nut is directly sleeved on the drive shaft to lock the impeller without setting a key or other structure. The impeller is fixed by this positioning and locking method, and the torque is generated by static friction, which has the advantages of no stress concentration and wear problems. However, at the same time, since the required static friction is large, a specific hydraulic tool is usually added to the drive shaft, and a large axial force is applied to the drive shaft through the hydraulic tool to stretch the drive shaft, and the locking nut is locked while the drive shaft is stretched. After repeated several times, the hydraulic equipment is removed. Since the locking nut hinders the deformation recovery of the drive shaft, a large axial force can be generated. This axial force can generate sufficient static friction on the friction surface to provide the torque required for the impeller to rotate, and at the same time, the locking nut can be reliably locked. However, this installation method requires the use of special hydraulic equipment, so the assembly efficiency is very low and maintenance is difficult.

[0007] In summary, currently it is difficult to achieve reliable positioning and locking of the impeller while facilitating disassembly and assembly, and thus it is difficult to improve the operating reliability of the compressor while simplifying the disassembly and assembly process of the compressor. Summary of the invention

[0008] Based on this, it is necessary to provide an impeller assembly and a compressor equipped with the impeller assembly, which are easy to disassemble and assemble and can be reliably positioned and locked, in order to solve the problem that the impeller is difficult to be reliably positioned and locked while being easy to disassemble and assemble.

[0009] An impeller assembly, the impeller assembly comprising:

[0010] An impeller having a front end face and a rear end face arranged opposite to each other in the direction of the central axis of the impeller, wherein the impeller is provided with an impeller central hole connecting the front end face and the rear end face;

[0011] A drive shaft, one end of which is inserted into the impeller center hole from the rear end surface, and one end of which is inserted into the impeller center hole is provided with a drive shaft center hole;

[0012] A compression gasket, one end of which is inserted into the central hole of the impeller from the front end surface, and the other end of which is abutted against the front end surface; and

[0013] The locking piece comprises a locking head and a locking rod connected to one end of the locking head, the locking rod passes through the compression gasket and is inserted into the central hole of the driving shaft, and the locking head is abutted against the compression gasket.

[0014] During the assembly process of the impeller assembly, the impeller is first installed on one end of the drive shaft through a shrink fit process, and after the impeller is cooled, a compression gasket is installed, and then the locking piece is tightened according to the specified torque. The disassembly process of the impeller is operated in the direction of the above-mentioned assembly process. It can be seen that the disassembly and assembly process of the impeller assembly is simple and convenient, and has a high disassembly and assembly efficiency. Moreover, since the drive shaft and the locking piece are respectively inserted into the center hole of the impeller from both ends of the impeller instead of the drive shaft completely passing through the center hole of the impeller, the length of the drive shaft is shorter, thereby reducing the flexural deformation occurring during high-speed rotation, and further reducing the impeller's beating. In addition, the locking piece realizes the axial positioning of the impeller by pressing the front end face of the impeller through the compression gasket, thereby avoiding the locking piece from directly contacting the impeller and wearing the front end face of the impeller, and the compression gasket cooperates with the impeller to realize the radial positioning of the impeller, limiting the deformation of the impeller. In this way, the impeller assembly is easy to disassemble and assemble, and at the same time, reliable positioning and locking are achieved, thereby simplifying the disassembly and assembly process of the compressor equipped with the impeller assembly and improving the operating reliability of the compressor.

[0015] In one embodiment, the impeller center hole includes a first connecting section and a second connecting section that are interconnected, the end of the first connecting section facing away from the second connecting section is connected to the rear end face, and the end of the second connecting section facing away from the first connecting section is connected to the front end face; the aperture of the first connecting section is larger than the aperture of the second connecting section, one end of the drive shaft is limited to the first connecting section, and one end of the clamping gasket is limited to the second connecting section.

[0016] In one embodiment, the hole wall of the first connecting section is provided with a first keyway extending from the front end face to the rear end face, and the outer cylindrical surface of the drive shaft is provided with a second keyway matching the first keyway; the impeller assembly also includes a connecting key, and the connecting key is limited to be located in the accommodating cavity formed by the first keyway and the second keyway.

[0017] In one embodiment, the central hole of the drive shaft includes a threaded connection section with an internal thread, and the locking rod includes a threaded connection portion with an external thread, and the threaded connection portion is threadedly connected to the threaded connection section.

[0018] In one embodiment, the central hole of the drive shaft further includes a positioning section connected to the threaded connection section, the locking rod includes a positioning portion connected to the threaded connection portion, and the positioning section is clearance-matched with at least a portion of the positioning portion.

[0019] In one embodiment, the clamping gasket includes a first clamping portion and a second clamping portion connected to one end of the first clamping portion, the outer diameter of the second clamping portion is smaller than that of the first clamping portion, the second clamping portion is inserted into the center hole of the impeller, and the end face of the first clamping portion connected to one end of the second clamping portion is abutted against the front end face.

[0020] In one embodiment, the clamping gasket is provided with a first clamping hole and a second clamping hole connected to the first clamping hole, one end of the first clamping hole is connected to the end surface of the first clamping part away from the second clamping part, the second clamping hole is connected to the first clamping hole and the end surface of the second clamping part away from the first clamping part, the aperture of the second clamping hole is smaller than the aperture of the first clamping hole, a step surface is formed between the first clamping hole and the second clamping hole, the locking rod passes through the first clamping hole, and the locking head is abutted against the step surface.

[0021] In one of the embodiments, the compression gasket and a side surface of the locking member protruding from the front end surface form an aerodynamic surface for guiding the flow of air.

[0022] In one embodiment, the aerodynamic surface is a curved surface convex in a direction away from the rear end surface.

[0023] A compressor comprises the impeller assembly mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of scheme 1 in the background technology;

[0025] Figure 2 It is a schematic diagram of scheme 2 in the background technology;

[0026] Figure 3 It is a schematic diagram of scheme 3 in the background technology;

[0027] Figure 4 is a schematic diagram of an impeller assembly according to an embodiment of the present invention;

[0028] Figure 5 for Figure 4 A front view of the impeller assembly is shown;

[0029] Figure 6 for Figure 4 A schematic diagram of an impeller of an impeller assembly shown;

[0030] Figure 7 for Figure 4 A schematic diagram of the drive shaft of the impeller assembly shown;

[0031] Figure 8 for Figure 4A schematic diagram of a compression gasket of an impeller assembly shown;

[0032] Fig. 9 for Figure 8 A front view of the compression gasket shown;

[0033] Fig.10 for Figure 4 A schematic diagram of a locking member of an impeller assembly shown;

[0034] Fig.11 for Fig.10 A front view of the locking member is shown. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] like Figure 4 and Figure 5 As shown, a centrifugal compressor (not shown) according to an embodiment of the present invention includes an impeller assembly 100 for increasing gas pressure. The impeller assembly 100 includes an impeller 10, a drive shaft 30, a compression gasket 50, and a locking member 70. The impeller 10 is mounted on the drive shaft 30 through the compression gasket 50 and the locking member 70. The impeller 10 can rotate at high speed with the drive shaft 30 to increase the gas pressure.

[0039] The impeller 10 has a front end face 123 and a rear end face 125 (eg, Figure 6As shown in the figure, the impeller 10 rotates with the drive shaft 30 to generate centrifugal force so that the airflow flows from the front end face 123 to the inside of the impeller 10. An impeller center hole 121 connecting the front end face 123 and the rear end face 125 is provided at the center of the impeller 10. One end of the drive shaft 30 is inserted into the impeller center hole 121 from the rear end face 125, and a drive shaft center hole 34 is provided at one end of the drive shaft 30 inserted into the impeller center hole 121. One end of the clamping gasket 50 is inserted into the impeller center hole 121 from the front end face 123, and the other end of the clamping gasket 50 abuts against the front end face 123. The locking member 70 includes a locking head 72 and a locking rod 74 connected to one end of the locking head 72, the locking rod 74 passes through the clamping gasket 50 and is inserted into the drive shaft center hole 34, and the locking head 72 abuts against the clamping gasket 50.

[0040] During the assembly process of the impeller assembly 100, the impeller 10 is first installed on one end of the drive shaft 30 through a shrink fit process, and after the impeller 10 is cooled, the compression gasket 50 is installed, and then the locking member 70 is tightened according to the specified torque. The disassembly process of the impeller 10 is the same as the directional operation of the above-mentioned assembly process. It can be seen that the disassembly and assembly process of the impeller assembly 100 is simple and convenient, and has a high disassembly and assembly efficiency. Moreover, since the drive shaft 30 and the locking member 70 are respectively inserted into the impeller center hole 121 from both ends of the impeller 10 instead of the drive shaft 30 completely passing through the impeller center hole 121, the length of the drive shaft 30 is shorter, thereby reducing the flexural deformation occurring during high-speed rotation, thereby reducing the vibration of the impeller 10. In addition, the locking member 70 realizes the axial positioning of the impeller 10 by pressing the front end face 123 of the impeller 10 through the pressing gasket 50, thereby avoiding the locking member 70 from directly contacting the impeller 10 and wearing the front end face 123 of the impeller 10, and the pressing gasket 50 cooperates with the impeller 10 to realize the radial positioning of the impeller 10, thereby limiting the deformation of the impeller 10. In this way, the impeller assembly 100 is easy to disassemble and assemble, and realizes reliable positioning and locking, thereby simplifying the disassembly and assembly process of the compressor provided with the impeller assembly 100 and improving the operating reliability of the compressor.

[0041] like Figure 4 and Figure 6 As shown, in some embodiments, the impeller 10 includes a hub 12 and blades 14 circumferentially surrounding the hub 12, a front end face 123 and a rear end face 125 are formed at both ends of the hub 12, and the central axis of the impeller center hole 121 coincides with the central axis of the impeller 10. The impeller center hole 121 includes a first connecting section 1212 and a second connecting section 1214 that are connected to each other, the first connecting section 1212 is connected to the rear end face 125 of the hub 12, the second connecting section 1214 is connected to the front end face 123 of the hub 12, and the aperture of the first connecting section 1212 is larger than the aperture of the second connecting section 1214, and the length of the first connecting section 1212 in the axial direction is also much larger than the length of the second connecting section 1214 in the axial direction.

[0042] In one embodiment, the hole wall of the first connecting section 1212 is further provided with a first keyway 1216 extending axially from the front end face 123 to the rear end face 125, and the first keyway 1216 is used to accommodate a connecting key that cooperates with the drive shaft 30, thereby realizing torque transmission from the drive shaft 30 to the impeller 10. Specifically, in one embodiment, the number of the first keyways 1216 is two, and the line connecting the two first keyways 1216 and the center point of the impeller 10 is 180°. It can be understood that the number of the first keyways 1216 is not limited and can be set as needed.

[0043] like Figure 4 and Figure 7 As shown, one end of the drive shaft 30 is inserted into the impeller center hole 121 of the impeller 10, and is transitionally fitted or interference fit with the impeller center hole 121. The outer cylindrical surface of the drive shaft 30 inserted into one end of the impeller center hole 121 is provided with a second key groove 32 matching the first key groove 1216. The impeller assembly 100 also includes a connecting key 90, which is limited to the accommodating cavity formed by the first key groove 1216 and the second key groove 32. In this way, one end of the drive shaft 30 is matched with the impeller 10 through the outer cylindrical surface and the connecting key 90, and the impeller 10 can rotate synchronously with the drive shaft 30.

[0044] In some embodiments, the drive shaft center hole 34 of the drive shaft 30 includes a transition section 341 , a positioning section 343 , and a threaded connection section 345 sequentially connected along the axial direction, and the drive shaft 30 is coupled to the locking member 70 through the drive shaft center hole 34 .

[0045] The transition section 341 is connected to the end face of the drive shaft 30 inserted into the impeller center hole 121, the positioning section 343 is connected to the end of the connecting section away from the front end face 123 of the impeller 10 (i.e., the side of the connecting section away from the end face of the drive shaft 30 inserted into the impeller center hole 121), and the threaded connecting section 345 is connected to the end of the positioning section 343 away from the transition section 341. The threaded connecting section 345 is provided with an internal thread to match with a part of the locking rod 74 of the locking member 70, the inner wall of the positioning section 343 is smooth to match with a part of the locking rod 74 of the locking member 70, and the aperture of the transition section 341 gradually increases from the end connected to the positioning section 343 to the end away from the positioning section 343. Specifically in one embodiment, the axial length of the positioning section 343 is 0.5-1 times the aperture of the positioning section 343 to meet the requirements of processing, assembly and connection effect.

[0046] like Figure 4 , Figure 8 and Fig. 9As shown, the compression gasket 50 includes a first compression portion 52 and a second compression portion 54 connected to one end of the first compression portion 52, and the outer diameter of the second compression portion 54 is smaller than that of the first compression portion 52. The second compression portion 54 is inserted into the second connecting section 1214 of the impeller center hole 121 and is clearance-matched with the second connecting section 1214 to achieve radial positioning of the compression gasket 50. Since the first keyway 1216 provided on the impeller 10 causes a certain degree of stress unevenness in the impeller 10, the second compression portion 54 has the function of limiting the deformation of the hub 12 in the impeller 10. The end face of the first compression portion 52 connected to one end of the second compression portion 54 is pressed against the front end face 123 of the hub 12, thereby achieving axial positioning of the compression gasket 50 and preventing the locking member 70 from directly contacting the front end face 123 of the impeller 10.

[0047] The clamping gasket 50 is provided with a first clamping hole 56 and a second clamping hole 58 connected to the first clamping hole 56 along the axial direction. One end of the first clamping hole 56 is connected to the end surface of the first clamping portion 52 away from the second clamping portion 54, and the second clamping hole 58 is connected to the first clamping hole 56 and the end surface of the second clamping portion 54 away from the first clamping portion 52. The aperture of the second clamping hole 58 is smaller than that of the first clamping hole 56, and a step surface is formed between the first clamping hole 56 and the second clamping hole 58.

[0048] like Figure 4 , Fig.10 and Fig.11 As shown, the locking head 72 of the locking member 70 includes a first head 721 and a second head 723, wherein the second head 723 is connected to one end of the first head 721 and has an outer diameter smaller than the first head 721. The second head 723 is inserted into the first pressing hole 56 of the pressing gasket 50, and the end surface of the second head 723 away from the first head 721 is pressed against the step surface, thereby pressing the pressing gasket 50 against the front end surface 123 of the hub 12. The end face of the first head 721 connected to the second head 723 is pressed against the end face of the clamping gasket 50 connected to the first clamping hole 56, and the end face of the first head 721 away from the second head 723 and the surface of the protruding front end face 123 of the clamping gasket 50 together form a curved surface convex away from the rear end face 125, so as to form an aerodynamic surface for guiding the airflow to flow smoothly into the radial direction of the impeller 10, thereby effectively reducing the noise generated by the airflow impacting the locking piece 70, and making the angle of the airflow entering the impeller 10 closer to the optimal inlet airflow angle of the impeller 10, thereby improving the aerodynamic performance of the impeller 10.

[0049] In one embodiment, a first head 721 of the locking head 72 is provided with a plurality of locking holes 7232 spaced apart along the circumferential direction on a surface of the side away from the second head 723, and the locking holes 7232 are used to lock the locking member 70 with a specific tool. It is understood that the locking method of the locking member 70 is not limited thereto, and in other embodiments, the locking hole 7232 may be replaced with a hexagonal hole located at the center of the first head 721 to match a standard torque tool.

[0050] The locking rod 74 is provided with a transition portion 741, a positioning portion 743 and a threaded connection portion 745 which are connected in sequence from the locking head 72 along the axial direction. The transition portion 741 passes through the first pressing hole 56 of the pressing gasket 50 and extends into the second connection section 1214 of the impeller center hole 121. The positioning portion 743 passes through the transition section 341 of the drive shaft center hole 34 and extends into the positioning section 343 and is clearance-matched with the positioning section 343. The outer diameter of the positioning portion 743 is smaller than the hole diameter of the transition section 341 and is spaced from the hole wall of the transition section 341. The threaded connection portion 745 is provided with an external thread, and the threaded connection portion 745 is inserted into the threaded connection section 345 of the drive shaft center hole 34 and is threadedly connected with the threaded connection section 345. In this way, while the threaded connection part 745 and the threaded connection section 345 are threadedly connected to achieve axial positioning, the positioning part 743 and the positioning section 343 are clearance-matched to achieve radial positioning of the locking member 70 in the drive shaft 30, thereby eliminating the phenomenon that the thread gap existing in the threaded cooperation causes the positioning accuracy of the locking member 70 to be insufficient, resulting in the locking member 70 tilting relative to the drive shaft 30, thereby causing the impeller 10 to be compressed and deformed.

[0051] In the impeller assembly 100 and the compressor provided with the same, the drive shaft 30 and the locking member 70 extend into the impeller center hole 121 of the impeller 10 from both ends, respectively. Therefore, compared with the prior art solution in which the drive shaft 30 passes through and protrudes from the front end face 123 of the impeller 10, the length of the drive shaft 30 is effectively shortened, the flexural deformation of the drive shaft 30 is reduced, and the abnormal vibration of the impeller 10 is reduced, thereby solving the problem of comb seal friction damage caused by excessive vibration of the impeller 10 during the operation of the compressor. Moreover, the mutual cooperation of the drive shaft 30, the clamping gasket 50 and the locking member 70 improves the positioning reliability of the impeller 10, and the impeller 10 is firmly locked on the drive shaft 30 to rotate with the drive shaft 30, and multiple disassembly and assembly will not cause damage to the impeller 10. Further, the assembly accuracy of the impeller assembly 100 depends only on the machining accuracy of the parts, thereby avoiding the influence of human assembly errors, and improving the assembly consistency of the impeller assembly 100 and the structural reliability of the impeller assembly 100. In addition, the airflow at the front end face 123 of the impeller 10 can smoothly enter the interior of the impeller 10 under the guidance of the compression gasket 50 and the locking member 70, thereby improving the aerodynamics of the impeller 10 and controlling the noise generated by the airflow impacting the impeller 10 to a very low level.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An impeller assembly (100), characterized in that: The impeller assembly (100) comprises: An impeller (10) comprising a front end face (123) and a rear end face (125) arranged opposite to each other in the direction of the central axis of the impeller (10); the impeller (10) is provided with an impeller center hole (121) connecting the front end face (123) and the rear end face (125); the impeller center hole (121) comprises a first connecting section (1212) and a second connecting section (1214) connected to each other; an end of the first connecting section (1212) facing away from the second connecting section (1214) is connected to the rear end face (125); an end of the second connecting section (1214) facing away from the first connecting section (1212) is connected to the front end face (123); and the aperture of the first connecting section (1212) is larger than the aperture of the second connecting section (1214); a drive shaft (30), one end of the drive shaft (30) being inserted into the impeller center hole (121) from the rear end surface (125), one end of the drive shaft (30) being limited to the first connecting section (1212), and one end of the drive shaft (30) being inserted into the impeller center hole (121) being provided with a drive shaft center hole (34); a compression gasket (50), one end of the compression gasket (50) being inserted into the impeller center hole (121) from the front end surface (123) and being limited to the second connecting section (1214), the other end of the compression gasket (50) being abutted against the front end surface (123), the compression gasket (50) being provided with a first compression hole (56) and a second compression hole (58) being connected to the first compression hole (56), the aperture of the second compression hole (58) being smaller than the aperture of the first compression hole (56), and a step surface being formed between the first compression hole (56) and the second compression hole (58); and A locking member (70), the locking member (70) comprising a locking head (72) and a locking rod (74) connected to one end of the locking head (72), the locking rod (74) passing through the compression gasket (50) and inserted into the central hole (34) of the drive shaft, the locking head (72) comprising a first head (721) and a second head (723), the second head (723) being connected to one end of the first head (721), the outer diameter of the second head (723) being smaller than the outer diameter of the first head (721), the end face of the second head (723) being away from the first head (721) being abutted against the step surface, and the end face of the first head (721) being connected to the second head (723) being abutted against the end face of the compression gasket (50) connected to the first compression hole (56); The end surface of the first head (721) away from the second head (723) and the surface of the compression gasket (50) protruding from the front end surface (123) together form an aerodynamic surface for guiding the flow of air, and the aerodynamic surface is a curved surface that bulges away from the rear end surface (125).

2. The impeller assembly (100) according to claim 1, characterized in that: The hole wall of the first connecting section (1212) is provided with a first keyway (1216) extending from the front end surface (123) to the rear end surface (125), and the outer cylindrical surface of the drive shaft (30) is provided with a second keyway (32) matching the first keyway (1216); the impeller assembly (100) further comprises a connecting key (90), the connecting key (90) being confined in an accommodating cavity formed by the first keyway (1216) and the second keyway (32).

3. The impeller assembly (100) according to claim 1, characterized in that: The drive shaft center hole (34) comprises a threaded connection section (345) provided with an internal thread, and the locking rod (74) comprises a threaded connection portion (745) provided with an external thread, wherein the threaded connection portion (745) is threadedly connected to the threaded connection section (345).

4. The impeller assembly (100) according to claim 3, characterized in that: The drive shaft center hole (34) further comprises a positioning section (343) connected to the threaded connection section (345), the locking rod (74) comprises a positioning portion (743) connected to the threaded connection portion (745), and the positioning section (343) is clearance-matched with at least a portion of the positioning portion (743).

5. The impeller assembly (100) according to claim 1, characterized in that: The clamping gasket (50) comprises a first clamping portion (52) and a second clamping portion (54) connected to one end of the first clamping portion (52), the outer diameter of the second clamping portion (54) being smaller than that of the first clamping portion (52), the second clamping portion (54) being inserted into the impeller center hole (121), and the end surface of the first clamping portion (52) connected to one end of the second clamping portion (54) being abutted against the front end surface (123).

6. The impeller assembly (100) according to claim 5, characterized in that: One end of the first clamping hole (56) is connected to an end surface of the first clamping portion (52) away from the second clamping portion (54), the second clamping hole (58) is connected to the first clamping hole (56) and an end surface of the second clamping portion (54) away from the first clamping portion (52), and the locking rod (74) passes through the first clamping hole (56).

7. A compressor, characterized in that: The impeller assembly comprises the impeller assembly (100) according to any one of claims 1 to 6.

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