Impeller connecting structure for centrifugal air compressor

Abstract

The utility model relates to an impeller connecting structure, in particular to an impeller connecting structure for a centrifugal air compressor, which comprises an impeller shaft, a threaded mounting part, a connecting part and a connecting part, the impeller main body is sleeved on the impeller shaft; and the fastener is matched with the threaded mounting part and is used for fixing the impeller main body on the impeller shaft. The impeller connecting structure for the centrifugal air compressor is simple in structure, stable, reliable and capable of being applied to high-speed rotation application scenes, facilitates simplification of the installation process of the impeller, facilitates disassembly and assembly tests of the centrifugal air compressor with the impeller as an important element, meets the use requirements of the impeller of the centrifugal air compressor, and improves the production efficiency of the centrifugal air compressor. And long-term stable operation of the air compressor is facilitated.

Description

Technical Field

[0001] The utility model relates to an impeller connection structure, in particular to an impeller connection structure for a centrifugal air compressor. Background Art

[0002] In recent years, hydrogen fuel cell systems have gained increasing attention. These systems place stringent demands on the quality of the air entering the system, necessitating stable and efficient operation of the air compressor. In a centrifugal air compressor, the impeller, as the sole component performing work on the air, requires a sufficiently reliable and stable fixed connection. Examples of impeller installation methods include the impeller mounting device, as described in Chinese Utility Model Patent Application No. CN201720590454.8. The connection between the impeller and the main shaft must ensure reliable fixation in both the radial and axial directions. Common methods for securing the impeller to the main shaft include keyed connections or interference fits. Keyed connections primarily utilize flat keys or splines to secure the main shaft and impeller and transmit torque. Interference fits consider the interference fit during impeller and main shaft design, leveraging the thermal expansion and contraction of materials during installation. The key lies in selecting the appropriate interference fit. Both methods require high processing and design requirements, and their structures are not suitable for repeated disassembly. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an impeller connection structure for a centrifugal air compressor which has a simple and reliable structure and is easy to assemble and disassemble.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an impeller connection structure for a centrifugal air compressor, comprising:

[0005] The impeller shaft has a threaded mounting portion at one end, and the rotation direction of the threaded mounting portion is opposite to that of the impeller shaft;

[0006] The impeller body is sleeved on the impeller shaft;

[0007] The fastener cooperates with the threaded mounting portion to fix the impeller body to the impeller shaft.

[0008] Furthermore, the fastener is a fastening nut.

[0009] Furthermore, it also includes an adjusting washer, which is sleeved on the impeller shaft, and the two ends of the impeller body are respectively in contact with the adjusting washer and the adjusting washer.

[0010] Furthermore, the adjusting washer includes two or more washers coaxially sleeved on the impeller shaft.

[0011] Furthermore, the clearance between the adjusting washer and the impeller shaft is matched.

[0012] Furthermore, the impeller shaft is provided with an annular mounting groove, the threaded mounting portion is arranged on the annular mounting groove, the impeller body, the fastener and the adjusting washer are all sleeved on the annular mounting groove, and the adjusting washer abuts against the side wall of the annular mounting groove.

[0013] Furthermore, it also includes an impeller gasket, which is sleeved on the impeller shaft and located between the impeller body and the fastener.

[0014] Furthermore, the impeller washer and the impeller shaft are clearance-matched.

[0015] Furthermore, the impeller body and the impeller shaft are clearance-matched.

[0016] Furthermore, mounting holes are provided at both ends of the impeller shaft.

[0017] The beneficial effects of the present invention are: an impeller connection structure for a centrifugal air compressor, a threaded mounting portion with a rotation direction opposite to that of the impeller shaft is processed on the impeller shaft, when the impeller body is installed on the impeller shaft, the fastener is screwed into the threaded mounting portion and tightened against the impeller body, when the impeller shaft rotates in a preset direction, the impeller body is firmly fixed to the impeller body by the fastener, the impeller adopts this connection method not only has a simple structure, stable and reliable, can be applied to high-speed rotation application scenarios, but also helps to simplify the installation process of the impeller, more convenient for the disassembly and assembly test of the centrifugal air compressor with the impeller as an important component, meets the impeller use requirements of the centrifugal air compressor, and is beneficial to the long-term stable operation of the air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the impeller connection structure of a centrifugal air compressor;

[0019] Description of labels:

[0020] 1. Impeller shaft; 11. Threaded mounting portion; 12. Annular mounting groove; 2. Impeller body; 3. Fastener; 4. Adjusting washer; 5. Impeller washer; 6. Mounting hole. DETAILED DESCRIPTION

[0021] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0022] Please refer to Figure 1 As shown, the utility model is an impeller connection structure for a centrifugal air compressor, comprising:

[0023] The impeller shaft 1 has a threaded mounting portion 11 at one end, and the rotation direction of the threaded mounting portion 11 is opposite to that of the impeller shaft 1;

[0024] The impeller body 2 is sleeved on the impeller shaft 1;

[0025] The fastener 3 cooperates with the threaded mounting portion 11 to fix the impeller body 2 on the impeller shaft 1 .

[0026] From the above description, it can be seen that the beneficial effects of the present invention are: an impeller connection structure for a centrifugal air compressor, a threaded mounting portion 11 with a rotation direction opposite to that of the impeller shaft 1 is processed on the impeller shaft 1, when the impeller body 2 is installed on the impeller shaft 1, the fastener 3 is screwed into the threaded mounting portion 11 and tightened against the impeller body 2, when the impeller shaft 1 rotates in a preset direction, the impeller body 2 is firmly fixed on the impeller body 2 by the fastener 3. The impeller adopts this connection method, which is not only simple in structure, stable and reliable, and can be applied to high-speed rotation application scenarios, but also helps to simplify the installation process of the impeller, and is more convenient for the disassembly and assembly test of the centrifugal air compressor with the impeller as an important component, meets the impeller use requirements of the centrifugal air compressor, and is beneficial to the long-term stable operation of the air compressor.

[0027] In an optional embodiment, the fastener 3 is a fastening nut.

[0028] From the above description, it can be seen that the fastening nut can be used as a subtractive component for the dynamic balancing of the impeller assembly as a whole. After the fastening nut is rotated to the designed position, a torque wrench is used to add a suitable pre-tightening force to the fastening nut. During high-speed rotation, the impeller rotates in a given direction, which can prevent the fastening nut from loosening along the thread during high-speed rotation.

[0029] In an optional embodiment, an adjusting washer 4 is further included. The adjusting washer 4 is sleeved on the impeller shaft 1 , and both ends of the impeller body 2 are respectively in contact with the adjusting washer 4 and the adjusting washer 4 .

[0030] It can be seen from the above description that the adjusting washer 4 is used to fine-tune the installation position of the impeller body 2 .

[0031] In an optional embodiment, the adjusting washer 4 includes two or more washers coaxially sleeved on the impeller shaft 1 .

[0032] From the above description, it can be seen that the adjustment gasket can have several gaskets of different thicknesses, and the gaskets can be increased or decreased according to whether the gap between the impeller body 2 and the volute is suitable for rotation.

[0033] In an optional embodiment, the adjusting washer 4 is clearance-fitted with the impeller shaft 1 .

[0034] It can be seen from the above description that the clearance fit is adopted in order to enable the impeller shaft 1 to pass through the center of the adjusting washer 4 .

[0035] In an optional embodiment, the impeller shaft 1 is provided with an annular mounting groove 12, the threaded mounting portion 11 is arranged on the annular mounting groove 12, the impeller body 2, the fastener 3 and the adjusting washer 4 are all sleeved on the annular mounting groove 12, and the adjusting washer 4 abuts against the side wall of the annular mounting groove 12.

[0036] In an optional embodiment, an impeller gasket 5 is further included. The impeller gasket 5 is sleeved on the impeller shaft 1 and is located between the impeller body 2 and the fastener 3 .

[0037] In an optional embodiment, the impeller washer 5 is clearance-fitted with the impeller shaft 1 .

[0038] It can be seen from the above description that the clearance fit is adopted in order to enable the impeller shaft 1 to pass through the center of the impeller gasket 5 .

[0039] In an optional embodiment, the impeller body 2 and the impeller shaft 1 are clearance-fitted.

[0040] It can be seen from the above description that the clearance fit is adopted in order to enable the impeller shaft 1 to pass through the center of the impeller body 2 .

[0041] In an optional embodiment, mounting holes 6 are provided at both ends of the impeller shaft 1 .

[0042] From the above description, it can be seen that the impeller shaft 1 has machined blind holes at both ends.

[0043] Please refer to Figure 1 As shown, the first embodiment of the present invention is: an impeller connection structure for a centrifugal air compressor, comprising:

[0044] The impeller shaft 1 has a threaded mounting portion 11 at one end, and the rotation direction of the threaded mounting portion 11 is opposite to that of the impeller shaft 1;

[0045] The impeller body 2 is sleeved on the impeller shaft 1;

[0046] The fastener 3 cooperates with the threaded mounting portion 11 to fix the impeller body 2 on the impeller shaft 1 .

[0047] The fastener 3 is a fastening nut. It also includes an adjusting washer 4, which is sleeved on the impeller shaft 1. The two ends of the impeller body 2 abut against the adjusting washer 4 and the adjusting washer 4 respectively. The adjusting washer 4 includes two or more gaskets coaxially sleeved on the impeller shaft 1. The adjusting washer 4 is loosely fitted with the impeller shaft 1. The impeller shaft 1 is provided with an annular mounting groove 12, and the threaded mounting portion 11 is provided on the annular mounting groove 12. The impeller body 2, the fastener 3, and the adjusting washer 4 are all sleeved on the annular mounting groove 12, and the adjusting washer 4 abuts against the side wall of the annular mounting groove 12. It also includes an impeller washer 5, which is sleeved on the impeller shaft 1 and is located between the impeller body 2 and the fastener 3. The impeller washer 5 is loosely fitted with the impeller shaft 1. The impeller body 2 is loosely fitted with the impeller shaft 1. Both ends of the impeller shaft 1 are provided with mounting holes 6.

[0048] To sum up, the impeller connection structure for a centrifugal air compressor of the present invention has a threaded mounting portion on the impeller shaft that is opposite to the rotation direction of the impeller shaft. After the impeller body is installed on the impeller shaft, the fastener is screwed into the threaded mounting portion and tightened against the impeller body. When the impeller shaft rotates in a preset direction, the impeller body is firmly fixed on the impeller body by the fastener. The impeller adopts this connection method, which is not only simple in structure, stable and reliable, and can be applied to high-speed rotation application scenarios, but also helps to simplify the installation process of the impeller, and is more convenient for the disassembly and assembly test of the centrifugal air compressor with the impeller as an important component, meets the impeller use requirements of the centrifugal air compressor, and is beneficial to the long-term stable operation of the air compressor.

[0049] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. An impeller connection structure for a centrifugal air compressor, characterized in that: include: The impeller shaft has a threaded mounting portion at one end, and the rotation direction of the threaded mounting portion is opposite to that of the impeller shaft; The impeller body is sleeved on the impeller shaft; The fastener cooperates with the threaded mounting portion to fix the impeller body to the impeller shaft.

2. The impeller connection structure for a centrifugal air compressor according to claim 1, characterized in that: The fastener is a fastening nut.

3. The impeller connection structure for a centrifugal air compressor according to claim 1, characterized in that: It also includes an adjusting washer, which is sleeved on the impeller shaft, and the two ends of the impeller body are respectively in contact with the adjusting washer and the adjusting washer.

4. The impeller connection structure for a centrifugal air compressor according to claim 3, characterized in that: The adjusting washer comprises two or more washers coaxially sleeved on the impeller shaft.

5. The impeller connection structure for a centrifugal air compressor according to claim 3, characterized in that: Adjust the clearance between the washer and the impeller shaft.

6. The impeller connection structure for a centrifugal air compressor according to claim 3, characterized in that: The impeller shaft is provided with an annular mounting groove, the threaded mounting portion is arranged on the annular mounting groove, the impeller body, fastener and adjusting washer are all sleeved on the annular mounting groove, and the adjusting washer abuts against the side wall of the annular mounting groove.

7. The impeller connection structure for a centrifugal air compressor according to claim 1, characterized in that: The utility model also comprises an impeller gasket, which is sleeved on the impeller shaft and located between the impeller body and the fastener.

8. The impeller connection structure for a centrifugal air compressor according to claim 7, characterized in that: The impeller gasket and the impeller shaft have a clearance fit.

9. The impeller connection structure for a centrifugal air compressor according to claim 1, characterized in that: The impeller body and the impeller shaft are clearance-matched.

10. The impeller connection structure for a centrifugal air compressor according to claim 1, characterized in that: Both ends of the impeller shaft are provided with mounting holes.

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