An impeller locking structure, engineering machinery, and locking method

Abstract

This invention discloses an impeller locking structure and engineering machinery, as well as a locking method, belonging to the field of impeller installation technology. It includes an interference-fit impeller and a main shaft, with a chuck and a retaining ring at the connection between the impeller and the main shaft, creating an interference fit between the chuck, impeller, and main shaft. This invention achieves primary locking through the interference fit between the impeller and the main shaft, and secondary locking through the interference fit between the chuck, impeller, and main shaft. The impeller is subjected to forces in both inward expansion and outward tightening directions, resulting in a good locking effect. Furthermore, it is applicable to locking impellers of different materials, making it widely adaptable.

Description

Technical Field

[0001] This invention relates to the field of impeller installation technology, and more specifically to an impeller locking structure, engineering machinery, and locking method. Background Technology

[0002] Currently, there are basically two types of locking structures for the impeller and main shaft of centrifuges: one is an interference fit between the main shaft and the inner hole of the impeller. However, in order to pursue structural stability and meet the requirements of locking the impeller and the main shaft as well as power transmission, this type of structure generally has a large interference fit.

[0003] A Chinese invention patent with patent number CN203604256U discloses a connection structure between an impeller and a main shaft, which adopts the first structure mentioned above. The shaft hole of the impeller hub and the main shaft are interference-fitted. Specifically, the impeller hub is heated to a temperature of 80-160 degrees Celsius, which increases the inner diameter of the shaft hole. The mounting position on the main shaft is cooled to a temperature of -80-160 degrees Celsius, which causes the mounting position on the main shaft to shrink. The impeller hub is then fitted onto the mounting position on the main shaft. After the temperature returns to normal, the impeller and the main shaft are tightly connected together.

[0004] This structure is generally suitable for larger impeller structures. It achieves an interference fit by changing the volume of the impeller bore and the main shaft through heating and cooling. If the impeller size is small, the volume changes little with temperature, making it difficult to meet the required interference.

[0005] Another type uses an interference fit between the rotor spindle and the impeller inner hole, but with a smaller interference amount. Keyways are milled in the spindle and impeller inner holes, and double or single keys are provided to satisfy the locking of the impeller and spindle and the transmission of power.

[0006] The two fastening structures described above are typically used when both the impeller and the main shaft are made of steel, and the strength, hardness, melting point, and shrinkage rate of the impeller and the main shaft are not significantly different. However, with the application of new materials such as aluminum alloys and engineering plastics, many impellers made of lighter aluminum alloys have replaced steel impellers.

[0007] Aluminum alloy impellers are lighter than steel impellers. Due to their light weight, an aluminum alloy impeller of the same size typically weighs about 30% of a steel impeller, which can reduce power consumption, achieve energy saving, and has good heat dissipation performance.

[0008] Because aluminum and steel have different coefficients of contraction and expansion at the same temperature, the interference fit cannot be guaranteed. Furthermore, aluminum alloys are softer than steel and are more easily deformed. Under these circumstances, the two locking structures mentioned above cannot meet the requirements of locking and torque transmission. This invention proposes a new solution to address these problems. Summary of the Invention

[0009] To overcome at least one of the aforementioned drawbacks, this invention provides an impeller locking structure, engineering machinery, and locking method. The objective of this invention can be achieved by employing the following technical solution:

[0010] An impeller locking structure is provided, wherein the shaft hole of the impeller is sleeved on the main shaft, and there is an interference fit between the impeller and the main shaft. A pawl is sleeved at the connection between the impeller and the main shaft, and a retaining ring is sleeved on the outer side of the pawl. The retaining ring is clamped on the outer side of the pawl so that there is an interference fit between the pawl, the impeller and the main shaft.

[0011] In one feasible embodiment, the end face of the chuck extends inward and has a plurality of grooves to increase the elasticity of the chuck when the chuck is clamped by the retaining ring.

[0012] In one feasible embodiment, the grooves are provided on both end faces of the plurality of claws, and a groove is provided at intervals on the end face with the same included angle between adjacent grooves, and the number of grooves on each end face is greater than or equal to four.

[0013] In one feasible embodiment, an annular groove for accommodating the pawl is provided at one end of the impeller hub.

[0014] In one feasible embodiment, at least a portion of the pawl is located within the slot and abuts against the inner wall of the slot of the impeller, and at least a portion of the pawl abuts against the outer wall of the main shaft.

[0015] In one feasible implementation, the contact surface between the slot and the claw is an inclined surface.

[0016] In one feasible implementation, the inner diameter of one end of the chuck connected to the main shaft is smaller than the inner diameter of one end of the chuck connected to the impeller.

[0017] In one feasible embodiment, the retaining ring is made of a hard metal material whose volume changes with temperature.

[0018] An engineering machine, comprising the impeller locking structure described in any one of the above claims.

[0019] A locking method for an impeller locking structure, applied to any of the impeller locking structures described above, the locking method comprising the following steps:

[0020] The main shaft and impeller are pre-treated. The main shaft shrinks in volume due to cooling, and / or the impeller expands in volume due to heating, so as to achieve an assembly gap between the main shaft and the impeller. The impeller is assembled on the main shaft. After the main shaft and the impeller return to normal temperature, an interference fit is achieved to form a locking mechanism.

[0021] Insert the jaws into the slots, and the jaws engage at the connection between the main shaft and the impeller.

[0022] The retaining ring is pretreated by heating and expanding its volume. The retaining ring is then placed on the outer wall of the jaw. After the retaining ring returns to room temperature, it is clamped onto the jaw to cause deformation. The jaw and retaining ring achieve an interference fit. The jaw then tightens the impeller and main shaft to achieve an interference fit, forming a secondary locking.

[0023] The beneficial technical effects of the present invention are as follows: According to the present disclosure, the impeller locking structure, engineering machinery, and locking method adopt an interference fit between the impeller and the main shaft to form a one-time locking. While there is an interference fit between the impeller and the main shaft, the pawl and the retaining ring lock the impeller radially on the outside, so that the impeller is subjected to forces in both the inward expansion and outward tightening directions. The pawl, the main shaft, and the impeller also generate an interference fit, resulting in a good locking effect. It can be applied to locking impellers of different materials and has wide applicability. Attached Figure Description

[0024] The following are given by way of example and without limitation in the accompanying drawings:

[0025] Figure 1 A schematic diagram of the overall cross-sectional structure of the present invention is shown;

[0026] Figure 2 A schematic diagram of the card slot structure of the present invention is shown;

[0027] Figure 3 A schematic cross-sectional view of the clasp and clasp of the present invention is shown;

[0028] Figure 4 A schematic diagram of the clamp and clasp mounting structure of the present invention is shown;

[0029] Figure 5 A schematic diagram of the retaining ring structure with screw holes of the present invention is shown;

[0030] Figure 6 A front view of the claw and circlip mounting structure of the present invention is shown;

[0031] Figure 7 A left view of the clamp and clasp mounting structure of the present invention is shown.

[0032] In the diagram: 1. Main shaft; 2. Impeller; 3. Claw; 4. Snap ring; 5. Spacer; 6. Snap groove; 7. Groove; 8. Screw hole. Detailed Implementation

[0033] In the following detailed disclosure, reference is made to the accompanying drawings, which illustrate specific embodiments that can be implemented. These embodiments are fully described by way of illustrations, which are part of the features. In order to enable those skilled in the art to understand and clarify the technical solution of the present invention more clearly, the embodiments described below are not limited thereto. The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0034] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] like Figure 1 and Figure 4 As shown, an impeller locking structure is provided, wherein the shaft hole of the impeller 2 is sleeved on the main shaft 1, and there is an interference fit between the impeller 2 and the main shaft 1. A pawl 3 is sleeved at the connection between the impeller 2 and the main shaft 1, and a retaining ring 4 is sleeved on the outside of the pawl 3. The retaining ring 4 is clamped on the outer side of the pawl 3 so that there is an interference fit between the pawl 3, the impeller 2 and the main shaft 1.

[0037] The interference fit between the impeller 2 and the main shaft 1 forms a locking mechanism. While the impeller 2 and the main shaft 1 have an interference fit, the pawl 3 and the retaining ring 4 lock the impeller 2 radially on the outside, so that the impeller 2 is subjected to forces in both the inward expansion and outward tightening directions. The pawl 3, the main shaft 1 and the impeller 2 also have an interference fit, resulting in a good locking effect. It can be used to lock impellers 2 made of different materials and has wide applicability.

[0038] During installation, the main shaft 1 is first cooled down to below -100℃. As the temperature decreases, the volume of the main shaft 1 decreases slightly. At the same time, the impeller 2 is heated to a temperature of at least 100℃, generally around 200℃. As the temperature of the impeller 2 increases, the inner diameter of the shaft hole increases, thus creating an assembly gap. At this point, the impeller 2 and the main shaft 1 are assembled. After both return to normal temperature, the outer diameter of the main shaft 1 expands, while the inner diameter of the shaft hole of the impeller 2 contracts, achieving an interference fit.

[0039] If the impeller 2 is made of steel, the assembly gap can be achieved simply by heating the impeller 2. If the impeller 2 is made of aluminum alloy, since the melting point of aluminum alloy is around 600℃, the heating temperature cannot be too high. Excessive heating temperature will cause the aluminum alloy impeller 2 to deform. In order to ensure the assembly gap, the preferred range is 150 to 250℃.

[0040] When the main shaft 1 is typically made of steel and the impeller 2 is made of aluminum alloy, taking the outer diameter of the main shaft 1 as 100 mm at room temperature as an example, the inner diameter of the shaft hole of the impeller 2 at room temperature is preferably 99.7 to 99.9 mm. The interference fit between the impeller 2 and the main shaft 1 is in the range of 1‰ to 3‰. In order to ensure the stability of the part structure, the interference fit generally does not exceed 2.5‰. While not affecting the internal structural stability of the two, the interference fit is achieved to improve the tightness.

[0041] like Figure 4 , Figure 6 and Figure 7 As shown, in one feasible embodiment, the end face of the claw 3 extends inward and is provided with a plurality of grooves 7, so as to increase the elasticity of the claw 3 when the clasp 4 clamps the claw 3.

[0042] The groove 7 extends inward from the end face of the jaw 3. At least a part of the groove 7 overlaps with the retaining ring 4. When the retaining ring 4 is in an interference fit with the jaw 3, it can press the parts on both sides of the groove 7 on the jaw 3 inward, so that the jaw 3 can fit against the impeller 2 and the main shaft 1, realizing the interference relationship between the jaw 3 and the main shaft 1 and between the jaw 3 and the impeller 2.

[0043] During installation, after the main shaft 1 and impeller 2 achieve an interference fit, the chuck 3 is inserted from one end of the main shaft 1, achieving a small clearance fit between the chuck 3 and impeller 2, and between the chuck 3 and main shaft 1. Then, the retaining ring 4 is heated and expanded in volume before being assembled onto the chuck 3. After the retaining ring 4 cools to room temperature, it shrinks in volume, clamping the chuck 3 to achieve an interference fit between the retaining ring 4 and the chuck 3. This further compresses the chuck 3 inward, causing a slight deformation, resulting in an interference fit between the chuck 3 and impeller 2, and between the chuck and main shaft 1.

[0044] In one feasible embodiment, grooves 7 are provided on both end faces of several claws 3. A groove 7 is provided on the end face at intervals and the included angle between two adjacent grooves 7 is the same. The number of grooves 7 on each end face is greater than or equal to four.

[0045] The grooves 7 are preferably evenly distributed on the claw 3, and the distance between two adjacent grooves 7 should not be too wide. If there are too few grooves 7, the distance between two grooves 7 will be too wide, and the claw 3 will not easily deform under the compression of the retaining ring 4. The distance between two adjacent grooves 7 should not be too close either, as the distance between the grooves 7 is too close, which will cause the claw 3 structure to be unstable and easy to break.

[0046] Therefore, the number of grooves 7 is at least four, depending on the size of the claw 3, and the distance between two adjacent grooves 7 is preferably in the range of 10mm to 50mm.

[0047] like Figure 5 As shown, in one feasible embodiment, the retaining ring 4 has several screw holes 8.

[0048] When disassembling the retaining ring 4, you can choose to break it off directly, or you can make use of the screw hole 8 on the retaining ring 4, for example, by screwing a screw into the screw hole 8, so that you can easily install and completely disassemble the retaining ring 4 with tools and achieve secondary use.

[0049] like Figure 2 As shown, in one feasible embodiment, an annular groove 6 for accommodating the pawl 3 is provided at one end of the impeller 2 hub.

[0050] Both the clevis 3 and the retaining ring 4 are approximately annular structures. The clevis 3 is located on the outer side of the inner wall of the retaining groove 6, covering the connection between the impeller 2 and the main shaft 1. The main shaft 1 and the impeller 2 can be fastened by the clevis 3.

[0051] like Figure 3 As shown, in one feasible embodiment, at least a portion of the pawl 3 is located in the slot 6 and abuts against the inner wall of the slot 6 of the impeller 2, and at least a portion of the pawl 3 abuts against the outer wall of the main shaft 1.

[0052] like Figure 3 As shown, a chamfered edge with a smaller width and a larger length can be provided on the inner wall of the retaining ring 4. During installation, the chamfered edge end face of the inner wall of the retaining ring 4 is stuck in the groove 7. After the retaining ring 4 cools down and shrinks in volume, the chamfered edge is inserted into the groove 7, making the position of the retaining ring 4 more stable and firmly fixed on the retaining claw 3.

[0053] like Figure 3 As shown, in one feasible embodiment, the contact surface between the slot 6 and the claw 3 is an inclined surface.

[0054] The cross-section of the slot 6 is r-shaped, and the structure of the claw 3 matches the structure of the slot 6. This structure of the slot 6 increases the contact area between the claw 3 and the slot 6. When the inclined surface of the claw 3 contacts the inclined surface of the slot 6, the claw 3 is properly installed, and the two inclined surfaces have the same taper, allowing for a complete fit. Simultaneously, the inclined surface of the claw 3 also provides an axial thrust to the inclined surface of the slot 6, preventing axial movement of the impeller 2.

[0055] Under the action of the retaining ring 4, the chuck 3 deforms to clamp the main shaft 1 and the impeller 2. The chuck 3 abuts against the outer wall of the main shaft 1 and the inner wall of the groove 6 of the impeller 2. Figure 3 As shown, the chuck 3 applies three forces to the main shaft 1 and the impeller 2, tightly locking the main shaft 1 and the impeller 2.

[0056] like Figure 3 As shown, in one feasible embodiment, the inner diameter of one end of the chuck 3 connected to the main shaft 1 is smaller than the inner diameter of one end of the chuck 3 connected to the impeller 2.

[0057] The inner diameter of the connection end between the chuck 3 and the main shaft 1 is slightly larger than the outer diameter of the main shaft 1, and the inner diameter of the connection end between the chuck 3 and the impeller 2 is slightly larger than the outer diameter of the groove 6. Both are in a small clearance fit at the beginning of installation, which makes it easier to achieve an interference fit when installing the retaining ring 4 later.

[0058] In one feasible implementation, the retaining ring 4 is made of a hard metal material whose volume changes with temperature.

[0059] When the retaining ring 4 is heated and expands in volume, it is placed on the outer surface of the retaining claw 3. After the retaining ring 4 cools down to room temperature, it shrinks in volume and tightly clamps onto the retaining claw 3.

[0060] The formula for calculating the coefficient of linear expansion is α=(ΔL-L0) / ΔT, where α represents the coefficient of linear expansion, ΔL represents the change in length, L0 represents the original length, and ΔT represents the change in temperature.

[0061] Taking a main shaft 1 with an outer diameter of 100mm and an impeller 2 with an inner diameter of 99.8mm as an example, the coefficient of thermal expansion of aluminum alloy is generally 18.81×10^ －6 mm / ℃~23.60×10^ －6 The coefficient of thermal expansion of steel is between mm / ℃ and 10×10^2. － 6 mm / ℃~20×10^ －6 mm / ℃.

[0062] When the room temperature is 20℃, the inner diameter of the shaft hole of the aluminum alloy impeller 2 heated to 200℃ is 100.14~100.22mm, and the outer diameter of the steel main shaft 1 cooled to -200℃ is 99.56~99.78mm. At this time, the inner diameter of the shaft hole of the impeller 2 is larger than the outer diameter of the main shaft 1, thus achieving the assembly clearance. After assembly and returning to normal temperature, the interference fit between the impeller 2 and the main shaft 1 is about 2‰, which meets the requirements.

[0063] Taking the inner diameter of the end of the chuck 3 connected to the spindle 1 as 100.1-100.3 mm and the outer diameter as 120.3 mm as an example, and the inner diameter of the retaining ring 4 as 120 mm at room temperature as an example, the inner diameter of the retaining ring 4 changes to 120.70-121.39 mm when heated to 600℃. At this time, the inner diameter of the retaining ring 4 is larger than the outer diameter of the chuck 3, thus achieving the assembly clearance. After the retaining ring 4 cools down to room temperature, it achieves an interference fit with the chuck 3, with an interference amount of about 3‰, which meets the requirements.

[0064] Under the compression of the retaining ring 4, the retaining claw 3 deforms, and an interference fit can be achieved between the retaining claw 3 and the main shaft 1, as well as between the retaining claw 3 and the impeller 2. The interference amount is in the range of 1‰ to 7‰, preferably 1.5‰ to 5‰. In order to ensure the stability of the part structure, the interference amount between the two generally does not exceed 5‰.

[0065] Understandably, the retaining ring 4 can be made of a metal with high hardness and volume that can change with temperature. Steel retaining rings are commonly used. Other materials for the retaining ring 4 include tungsten, titanium, iron, and their alloys. The coefficient of thermal expansion of most metals is between 12 and 30 × 10^6. －6 Within the range of mm / ℃, the clearance required for assembly can be basically met.

[0066] like Figure 1 As shown, both ends of the impeller 2 are provided with spacers 5 that are sleeved on the main shaft 1 to restrict the movement of the impeller 2 from both ends and fix the position of the impeller 2 on the main shaft 1.

[0067] An engineering machine, comprising an impeller locking structure according to any one of the above.

[0068] Impeller 2, as a common rotating mechanism, is widely used in engineering machinery, such as compressors, engines, water pumps, wind turbines, and ship propulsion systems. Therefore, this impeller locking mechanism is widely used in engineering machinery.

[0069] The impeller 2 in the compressor is the core component. It compresses gas through the centrifugal force generated by its rotation. The compressor is widely used in air compression and refrigeration.

[0070] The turbocharger in the engine compresses air by rotating the impeller at high speed, increasing the intake air volume and improving the engine's output power.

[0071] The impeller 2 of the water pump pushes water into the pipeline through centrifugal force, realizing water transportation and lifting, and is widely used in agricultural irrigation, urban water supply and drainage and other fields.

[0072] Wind turbines convert the kinetic energy generated by the rotation of the impeller 2 due to the impact of wind into electrical energy, thus realizing the utilization of wind energy.

[0073] The impeller 2 of the ship's propulsion unit rotates to generate thrust, propelling the ship forward and achieving the propulsion function.

[0074] like Figures 1-7 As shown, a locking method for an impeller locking structure is applied to any of the impeller locking structures described above. The locking method includes the following steps:

[0075] Pre-treatment is performed on the main shaft 1 and impeller 2. The main shaft 1 is cooled and its volume shrinks, and / or the impeller 2 is heated and its volume expands, so that an assembly gap is achieved between the main shaft 1 and the impeller 2. The impeller 2 is assembled on the main shaft 1. After the main shaft 1 and the impeller 2 return to normal temperature, an interference fit is achieved to form a locking mechanism.

[0076] Insert the chuck 3 into the slot 6, and the chuck 3 engages at the connection between the main shaft 1 and the impeller 2.

[0077] The retaining ring 4 is pretreated by heating and expanding its volume. The retaining ring 4 is then placed on the outer wall of the jaw 3. After the retaining ring 4 returns to room temperature, it is clamped onto the jaw 3 to cause the jaw 3 to deform. The jaw 3 and the retaining ring 3 achieve an interference fit. The jaw 3 fastens the impeller 2 and the main shaft 1 to achieve an interference fit and form a secondary locking.

[0078] During implementation, the temperature of the main shaft 1 and / or impeller 2 is adjusted to achieve volume change, thereby creating an assembly gap between the two. After returning to normal temperature, the main shaft 1 and impeller 2 achieve an interference fit, forming a locking mechanism.

[0079] The chuck 3 is engaged at the connection between the main shaft 1 and the impeller 2, with a small gap between the chuck 3 and the main shaft 1 and between the chuck 3 and the impeller 2.

[0080] After the retaining ring 4 is heated and expands in volume, it is fitted onto the retaining claw 3. After the retaining ring 4 returns to normal temperature, it is clamped onto the retaining claw 3. The retaining claw 3 deforms inward at the position with the groove 7. The two ends of the retaining claw 3 are respectively clamped on the impeller 2 and the main shaft 1. The retaining claw 3 fastens the impeller 2 and the main shaft 1 to achieve an interference fit and form a secondary locking.

[0081] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0083] In view of the detailed description above, these and other changes can be made to these embodiments, and this written description includes embodiments of the best mode that disclose the invention. The patent scope of the invention is defined by the claims, which are not limited by this disclosure. The scope of protection of the invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the invention disclosed herein, based on the technical solutions and concepts of the invention, are within the scope of protection of the invention.

Claims

1. An impeller locking structure, characterized in that, The impeller (2) is fitted onto the main shaft (1) through its shaft hole. The impeller (2) and the main shaft (1) have an interference fit. A pawl (3) is fitted at the connection between the impeller (2) and the main shaft (1). A retaining ring (4) is fitted on the outer side of the pawl (3). The retaining ring (4) is clamped to the outer side of the pawl (3) so that the pawl (3), the impeller (2) and the main shaft (1) have an interference fit. An annular groove (6) for accommodating the pawl (3) is opened at one end of the impeller (2) hub. At least a part of the pawl (3) is located in the groove (6) and abuts against the inner wall of the groove (6) of the impeller (2). At least a part of the pawl (3) abuts against the outer wall of the main shaft (1). The retaining ring (4) is made of a hard metal material whose volume changes with temperature. The locking method of the impeller locking structure includes pre-processing the main shaft (1) and the impeller (2), shrinking the main shaft (1) by cooling, and / or expanding the impeller (2) by heating, so as to achieve an assembly gap between the main shaft (1) and the impeller (2), assembling the impeller (2) on the main shaft (1), and achieving an interference fit relationship to form a locking after the main shaft (1) and the impeller (2) return to normal temperature; Insert the chuck (3) into the slot (6), and the chuck (3) engages at the connection between the main shaft (1) and the impeller (2); The retaining ring (4) is pretreated and heated to expand its volume. The retaining ring (4) is then placed on the outer wall of the jaw (3). After the retaining ring (4) returns to normal temperature, it is clamped onto the jaw (3) to cause the jaw (3) to deform. The jaw (3) and the retaining ring (4) achieve an interference fit. The jaw (3) fastens the impeller (2) and the main shaft (1) to achieve an interference fit and form a secondary locking.

2. The impeller locking structure according to claim 1, characterized in that, The end face of the claw (3) extends inward and has multiple grooves (7) to increase the elasticity of the claw (3) when the claw (3) is clamped by the retaining ring (4).

3. The impeller locking structure according to claim 2, characterized in that, The two end faces of several of the claws (3) are provided with the grooves (7). A groove (7) is provided at intervals on the end face and the included angle between two adjacent grooves (7) is the same. The number of grooves (7) on each end face is greater than or equal to four.

4. The impeller locking structure according to claim 1, characterized in that, The contact surface between the slot (6) and the claw (3) is an inclined surface.

5. The impeller locking structure according to claim 1, characterized in that, The inner diameter of one end of the chuck (3) connected to the main shaft (1) is smaller than the inner diameter of one end of the chuck (3) connected to the impeller (2).

6. An engineering machinery, characterized in that, Includes the impeller locking structure as described in any one of claims 1-5.

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