Air compressor rotor structure

Abstract

The utility model provides a rotor structure of an air compressor, which belongs to the technical field of air compressors and comprises magnetic steel, a sheath and two shaft end structures, and mounting spaces are reserved at two end parts of the sheath; the two shaft end structures are symmetrically arranged at the two ends of the sheath, each shaft end structure comprises a shaft head and a shaft sleeve, each shaft head comprises a mounting part and an extending part, and the mounting parts are embedded into the mounting spaces; the outer diameter of the extending part is smaller than that of the mounting part, and a welding bead avoiding space is reserved; and the shaft sleeve sleeves the outer side of the extension part. According to the rotor structure of the air compressor provided by the utility model, the mounting part and the extension part are arranged separately, and the mounting part forms an enough weld bead abdicating space by means of the diameter difference between the mounting part and the extension part; the shaft sleeve is mounted after the sheath and the mounting part are welded, so that the outer diameter of the shaft end structure is ensured, and the diameter difference between the shaft end structure and the sheath is reduced; the outer diameter of the sheath of the rotor is reduced under the condition of the same bearing diameter, so that the weight of the rotor is reduced, and the overload failure risk of the bearing is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of air compressor technology, and more specifically, relates to an air compressor rotor structure. Background Technology

[0002] When a centrifugal air compressor for a fuel cell is operating, the rotor rotates at high speed, driving the impeller to compress air and increase the output air pressure and flow rate. Currently, most air compressors use air bearings, which are characterized by high speed and low load capacity. Therefore, a lighter rotor can reduce the risk of bearing overload failure.

[0003] A conventional air bearing consists of a housing, magnets, and shaft ends on both sides. During installation, the magnets are installed inside the housing, then the shaft ends are inserted into the housing, and finally, the shaft ends are welded to the housing. The shaft end includes a mounting section and an extension section. The difference in diameter between the mounting section and the extension section forms a stepped structure. The mounting section extends into the inside of the housing, and its end face is flush with the end face of the housing, where they are welded together. The stepped structure formed by the mounting section and the extension section provides space for the weld bead. To meet welding requirements, the diameter difference between the outer diameter of the housing and the extension section must ensure sufficient welding space. This results in an increased outer diameter of the housing, increased rotor weight, and an increased risk of bearing overload failure. Utility Model Content

[0004] The purpose of this utility model is to provide an air compressor rotor structure that aims to reduce the diameter difference between the shaft head and the sleeve at the stepped structure, reduce the outer diameter of the rotor sleeve and the rotor weight, thereby reducing the risk of bearing overload failure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An air compressor rotor structure is provided, comprising a magnet, a sheath, and two shaft end structures. The sheath is fitted onto the outside of the magnet, and installation space is provided at both ends of the sheath. The two shaft end structures are symmetrically arranged at both ends of the sheath. Each shaft end structure includes a shaft head and a shaft sleeve. The shaft head includes a mounting portion and an extension portion. The mounting portion is embedded within the installation space, and its first end abuts against the magnet inside the sheath. The second end of the mounting portion is flush with the end face of the sheath. The extension portion connects to the second end of the mounting portion. The outer diameter of the extension portion is smaller than the outer diameter of the mounting portion, and a weld clearance space is provided. The shaft sleeve is fitted onto the outside of the extension portion, and its end abuts against the second end of the mounting portion.

[0006] In another embodiment of this application, the outer diameter of the bushing is smaller than the outer diameter of the mounting portion, and the end of the bushing abuts against the end face of the mounting portion.

[0007] In another embodiment of this application, the outer diameter of the bushing is larger than the outer diameter of the mounting portion, and the bushing covers the weld between the mounting portion and the sheath.

[0008] In another embodiment of this application, both end faces of the sheath have a first welding bevel, and the mounting portion has a second welding bevel. The first welding bevel and the second welding bevel are connected to each other to form a welding position.

[0009] In another embodiment of this application, both the first welding bevel and the second welding bevel have welding bevels.

[0010] In another embodiment of this application, the extension includes a first shaft segment and a second shaft segment with gradually increasing outer diameter, the second shaft segment being connected to the mounting portion, and the bushing being fixedly connected to the second shaft segment.

[0011] In another embodiment of this application, the length of the bushing is the same as the length of the second shaft segment, and the bushing is welded or interference-fitted to the second shaft segment.

[0012] In another embodiment of this application, the extension has an axially oriented limiting groove, and the inner side of the bushing has a strip-shaped protrusion that is adapted to the limiting groove.

[0013] The beneficial effects of the air compressor rotor structure provided by this utility model are as follows: Compared with the prior art, the air compressor rotor structure of this utility model has the mounting part and the extension part set separately. The mounting part and the sheath are welded first, and the mounting part forms sufficient weld space by means of the diameter difference between it and the extension part. After the sheath and the mounting part are welded, the bushing is installed to ensure the outer diameter of the shaft end structure and reduce the diameter difference between the shaft end structure and the sheath. This achieves the goal of reducing the outer diameter of the rotor sheath under the same bearing diameter, thereby reducing the weight of the rotor and reducing the risk of bearing overload failure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the air compressor rotor structure provided in this embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the air compressor rotor structure without bushing provided in an embodiment of the present invention.

[0017] In the diagram: 1. Sheath; 2. Magnet; 3. Mounting part; 4. Extension part; 5. Bushing; 6. Welding position; 7. First shaft section; 8. Second shaft section. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Please see Figures 1 to 2 The air compressor rotor structure provided by this utility model will now be described. The air compressor rotor structure includes a magnet 2, a sheath 1, and two shaft end structures. The sheath 1 is installed on the outside of the magnet 2, and installation space is left at both ends of the sheath 1. The two shaft end structures are symmetrically arranged at both ends of the sheath 1. The shaft end structure includes a shaft head and a shaft sleeve 5. The shaft head includes a mounting part 3 and an extension part 4. The mounting part 3 is embedded in the installation space. The first end of the mounting part 3 abuts against the magnet 2 inside the sheath 1, and the second end of the mounting part 3 is flush with the end face of the sheath 1. The extension part 4 is connected to the second end of the mounting part 3. The outer diameter of the extension part 4 is smaller than the outer diameter of the mounting part 3, and a space is left for the weld bead. The shaft sleeve 5 is sleeved on the outside of the extension part 4, and the end of the shaft sleeve 5 abuts against the second end of the mounting part 3.

[0020] The two shaft ends have identical structures, consisting of a left shaft head and a right shaft head, which are respectively installed at both ends of the protective sleeve 1. During installation, first insert the mounting part 3 of the right shaft head into one end of the protective sleeve 1, then install the magnet 2 inside the protective sleeve 1, and insert the mounting part 3 of the left shaft head into the other end of the protective sleeve 1; next, weld the left shaft head to the protective sleeve 1, and the right shaft head to the protective sleeve 1; finally, install the bushings 5 ​​on the left and right shaft heads respectively. Alternatively, in the first step, after inserting the mounting part 3 of the right shaft head into the protective sleeve 1, weld the right shaft head to the bushing first; then, after inserting the mounting part of the left shaft head into the other end of the protective sleeve, weld the left shaft head to the bushing.

[0021] Compared with the prior art, the air compressor rotor structure provided by this utility model has the mounting part 3 and the extension part 4 set separately. The mounting part 3 and the sheath 1 are welded first. The mounting part 3 forms sufficient weld space by means of the diameter difference between it and the extension part 4. After the sheath 1 and the mounting part 3 are welded, the bushing 5 is installed. This can ensure the outer diameter of the shaft end structure and reduce the diameter difference between the shaft end structure and the sheath 1. Thus, the outer diameter of the rotor sheath 1 is reduced under the condition of the same bearing diameter, thereby reducing the weight of the rotor and reducing the risk of bearing overload failure.

[0022] The extension 4 has multiple shaft segments, the outer diameter of which gradually increases from the side facing the mounting portion 3. The bushing 5 is mounted on the shaft segment closest to the mounting portion 3, that is, the inner diameter of the bushing 5 is the same as the outer diameter of the thickest shaft segment on the extension 4.

[0023] The thickness of the bushing 5 is unlimited. The outer wall of the bushing 5 is located outside or inside the annular weld bead. When the outer diameter of the bushing 5 is smaller than the outer diameter of the mounting part 3, and the end of the bushing 5 abuts against the end face of the mounting part 3, the outer edge of the bushing 5 is located outside the weld bead, and the bushing 5 covers the weld bead. When the outer diameter of the bushing 5 is larger than the outer diameter of the mounting part 3, and the end of the bushing 5 abuts against the end face of the mounting part 3, the outer edge of the bushing 5 is located inside the weld bead. When the outer diameter of the bushing 5 is the same as the outer diameter of the mounting part 3, and the end of the bushing 5 abuts against the end face of the mounting part 3, the outer edge of the bushing 5 fits against the weld bead.

[0024] Both end faces of the sheath 1 have a first welding bevel, and the mounting part 3 has a second welding bevel. The first welding bevel and the second welding bevel are connected to form a welding position 6. Both the first welding bevel and the second welding bevel have welding bevels.

[0025] In some possible embodiments, please refer to Figure 2 The extension 4 includes a first shaft segment 7 and a second shaft segment 8 with gradually increasing outer diameter. The second shaft segment 8 is connected to the mounting part 3, and the bushing 5 is fixedly connected to the second shaft segment 8.

[0026] The extension 4 is divided into multiple shaft segments, including a first shaft segment 7 at the end and a second shaft segment 8 near the mounting part 3. The outer diameter of the second shaft segment 8 is larger than the outer diameter of the first shaft segment 7, and a step is formed between the second shaft segment 8 and the first shaft segment 7.

[0027] The bushing 5 is mounted on the second shaft segment 8, with its end abutting against the end face of the sheath 1. The length of the bushing 5 is less than or equal to the length of the second shaft segment 8. When the length of the bushing 5 is the same as the length of the second shaft segment 8, the end face of the bushing 5 and the end face of the connection between the second shaft segment 8 and the first shaft segment 7 are flush, and the outer wall of the bushing 5 and the outer wall of the first shaft segment 7 form a step due to the diameter difference. When the length of the bushing 5 is the same as the length of the second shaft segment 8, the bushing 5 and the second shaft segment 8 are welded together or fitted with an interference fit. When an interference fit is used, the bushing 5 and the second shaft segment 8 can be made of the same material. Alternatively, the bushing 5 and the second shaft segment 8 can be made of materials with significantly different coefficients of thermal expansion, so that the coefficient of thermal expansion of the bushing 5 is less than that of the second shaft segment 8. During operation, as the temperature of the shaft system structure rises, the interference fit between the second shaft segment 8 and the bushing 5 gradually increases with their thermal expansion, improving the connection stability between the bushing 5 and the second shaft segment 8.

[0028] In some possible embodiments, the extension 4 has an axially oriented limiting groove, and the inner side of the bushing 5 has a strip-shaped protrusion that is adapted to the limiting groove.

[0029] The bushing 5 engages with the extension 4 via a locking groove formed on its inner side, preventing relative rotation between the bushing 5 and the extension 4. Optionally, the end of the locking groove near the first shaft segment 7 extends to the stepped surface between the second shaft segment 8 and the first shaft segment 7, and the cross-section of the locking groove is rectangular.

[0030] When the bushing 5 is fixed to the extension 4 by welding, the bushing 5 must first be pushed axially into the second shaft section 8. During the pushing process, the strip-shaped protrusion of the bushing 5 is located in the limiting groove and slides along the length direction of the limiting groove until the end of the bushing 5 abuts against the mounting part 3; then the bushing 5 is welded to the second shaft section 8.

[0031] In addition, the air compressor rotor structure of this utility model has other advantages in practical applications.

[0032] Due to its unique structural design, maintenance and component replacement are more convenient. When the bushing 5 is worn or damaged, its specific connection with the extension 4 allows for easy removal and replacement without significantly affecting the overall rotor structure.

[0033] During the operation of the air compressor, the aforementioned rotor structure effectively reduces vibration. The tight welding between the mounting part 3 and the sheath 1, and the stable connection between the bushing 5 and the extension part 4, make the rotor's center of gravity more stable during high-speed rotation, reducing vibration caused by imbalance. This not only extends the service life of the air compressor but also reduces noise caused by vibration, improving the comfort of the working environment.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An air compressor rotor structure, characterized in that, The device includes a magnet (2), a sheath (1), and two shaft end structures. The sheath (1) is mounted on the outside of the magnet (2), and both ends of the sheath (1) have space for installation. The two shaft end structures are symmetrically arranged at both ends of the sheath (1). Each shaft end structure includes a shaft head and a shaft sleeve (5). The shaft head includes a mounting part (3) and an extension part (4). The mounting part (3) is embedded in the installation space. The first end of the mounting part (3) abuts against the magnet (2) inside the sheath (1), and the second end of the mounting part (3) is flush with the end face of the sheath (1). The extension part (4) connects to the second end of the mounting part (3). The outer diameter of the extension part (4) is smaller than the outer diameter of the mounting part (3), and space is left for welding. The shaft sleeve (5) is sleeved on the outside of the extension part (4), and the end of the shaft sleeve (5) abuts against the second end of the mounting part (3).

2. The air compressor rotor structure as described in claim 1, characterized in that, The outer diameter of the bushing (5) is smaller than the outer diameter of the mounting part (3), and the end of the bushing (5) abuts against the end face of the mounting part (3).

3. The air compressor rotor structure as described in claim 1, characterized in that, The outer diameter of the bushing (5) is larger than the outer diameter of the mounting part (3), and the bushing (5) covers the weld of the mounting part (3) and the sheath (1).

4. The air compressor rotor structure as described in claim 1, characterized in that, The sheath (1) has a first welding bevel on both end faces, and the mounting part (3) has a second welding bevel. The first welding bevel and the second welding bevel are connected to each other to form a welding position (6).

5. The air compressor rotor structure as described in claim 4, characterized in that, Both the first welding bevel and the second welding bevel have welding bevels.

6. The air compressor rotor structure as described in claim 1, characterized in that, The extension (4) includes a first shaft segment (7) and a second shaft segment (8) with gradually increasing outer diameter. The second shaft segment (8) is connected to the mounting part (3), and the bushing (5) is fixedly connected to the second shaft segment (8).

7. The air compressor rotor structure as described in claim 6, characterized in that, The length of the bushing (5) is the same as the length of the second shaft segment (8), and the bushing (5) is welded or interference-fitted with the second shaft segment (8).

8. The air compressor rotor structure as described in claim 1, characterized in that, The extension (4) has an axially oriented limiting groove, and the inner side of the bushing (5) has a strip-shaped protrusion that is adapted to the limiting groove.

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