Structure for on-site dynamic balance of rotor of magnetic suspension compressor

Abstract

The utility model relates to a structure for on-site dynamic balance of a rotor of a magnetic suspension compressor. The output end of the magnetic suspension motor is provided with a motor main shaft; the impeller is connected with the motor main shaft, the impeller comprises a first end and a second end which are oppositely arranged in the axial direction, and a first anti-rotation structure is arranged between the first end of the impeller and the end face of the motor main shaft; and the balance gasket is arranged at the second end of the impeller, a second anti-rotation structure is arranged between the balance gasket and the impeller, and a plurality of balance weight holes used for installing balance weight blocks are distributed in the annular direction of the balance gasket. The utility model provides a structure for on-site dynamic balance of a rotor of a magnetic suspension compressor, which can realize accurate dynamic balance adjustment, does not need to carry out dynamic balance again in the subsequent maintenance process, and greatly improves the maintenance convenience.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field especially is a kind of structure for magnetic suspension compressor rotor field dynamic balance. BACKGROUND

[0002] High-speed rotor dynamic balance of high-speed compressor is crucial, especially for the compressor using gear to increase speed, its high-speed rotor usually needs to carry out dynamic balance process, and is completed in special laboratory environment.

[0003] Magnetic suspension motor is widely used in high-speed compressor as a kind of efficient, low-loss power source. The dynamic balance process of this kind of compressor needs to carry out whole machine dynamic balance after impeller and motor shaft assembly is completed. However, when dynamic balance adjustment is carried out on site, due to the limitation of environment, traditional weight removal method can only rely on abrasive wheel to polish the surface or edge of impeller. The precision of weight removal by abrasive wheel polishing is low, and it is easy to cause uneven mass distribution, affect rotor balance effect, and a large amount of metal dust will be generated in the process of impeller polishing, pollute the on-site environment. SUMMARY

[0004] Therefore, the utility model provides a kind of structure for magnetic suspension compressor rotor field dynamic balance, accurate dynamic balance adjustment can be realized, and dynamic balance does not need to be carried out again in subsequent maintenance process, and maintenance convenience is greatly improved.

[0005] To solve the above technical problems, the utility model provides a kind of structure for magnetic suspension compressor rotor field dynamic balance, comprising:

[0006] Magnetic suspension motor, its output end is provided with motor shaft;

[0007] Impeller, connected with the motor shaft, the first end and the second end of the impeller are axially opposite, the first end of the impeller and the end face of the motor shaft are provided with the first anti-rotation structure;

[0008] Balance washer, set up in the second end of the impeller and provided with the second anti-rotation structure between the two, a plurality of counterweight holes for installing counterweight block are distributed along the balance washer.

[0009] In an embodiment of the utility model, the first anti-rotation structure includes first anti-rotation pin.

[0010] In an embodiment of the utility model, it further includes pressing screw rod and locking nut;

[0011] Axially extending positioning screw hole is arranged along the middle part of the end face of the motor shaft, and center through hole is arranged along the axial direction of the impeller;

[0012] The clamping screw includes a first end and a second end arranged axially opposite to each other. The first end of the clamping screw passes through the central through hole and is threaded into the positioning screw hole. The second end of the clamping screw passes through the balance washer.

[0013] The locking nut is connected to the second end of the clamping screw and presses the balance washer against the second end of the impeller.

[0014] In one embodiment of this utility model, a protective sleeve is also included;

[0015] The protective sleeve is provided around the outer periphery of the balance washer and the second end of the clamping screw;

[0016] The protective sleeve includes a first end and a second end arranged axially opposite to each other. The first end of the protective sleeve is annular and abuts against the outer end of the counterweight hole to prevent the counterweight from falling out.

[0017] The second anti-rotation structure includes a second anti-rotation pin, which is connected between the second end of the impeller, the balance washer, and the first end of the protective sleeve.

[0018] The second end of the protective sleeve is provided with a connecting hole, and a screw that abuts against the end of the clamping screw is connected to the connecting hole.

[0019] In one embodiment of this utility model, the locking nut is a round nut.

[0020] In one embodiment of this utility model, the end face of the motor spindle is provided with a first positioning hole, and the first end of the impeller extends with a first positioning boss suitable for positioning and cooperating with the first positioning hole.

[0021] In one embodiment of this utility model, the first positioning hole extends inward to form a second positioning hole, the diameter of the second positioning hole being smaller than that of the first positioning hole, and a radial boss is provided along the clamping screw and accommodated within the second positioning hole, the radial boss being able to abut against the first positioning boss when the clamping screw is screwed out.

[0022] In one embodiment of this utility model, the second end of the impeller is provided with a third positioning hole, and the balance washer extends axially with a second positioning boss suitable for positioning and cooperating with the third positioning hole.

[0023] In one embodiment of this utility model, the counterweight hole is a threaded hole, and the counterweight block is threadedly connected to the counterweight hole.

[0024] In one embodiment of this utility model, 8 to 16 counterweight holes are evenly distributed along the circumferential direction of the balance washer.

[0025] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0026] This invention discloses a structure for on-site dynamic balancing of a magnetic levitation compressor rotor. By setting a balancing washer at the front end of the impeller and employing an adjustable counterweight with circumferentially distributed counterweight holes, precise dynamic balancing adjustment is achieved. The structure is simple, easy to operate, and has low implementation cost. Simultaneously, the use of two anti-rotation structures ensures that the assembly direction of the main components is unique, eliminating the need for rebalancing during subsequent maintenance and significantly improving maintenance convenience and equipment operational stability. Attached Figure Description

[0027] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the adjustable dynamic balancing structure of the present invention used in a magnetic levitation compressor.

[0029] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0030] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle.

[0031] Explanation of reference numerals in the instruction manual:

[0032] 1. Motor spindle; 11. First positioning hole; 12. Second positioning hole; 13. Positioning screw hole;

[0033] 2. Impeller; 21. First positioning boss; 22. Third positioning hole; 23. Central through hole;

[0034] 3. First anti-rotation structure; 31. First anti-rotation pin;

[0035] 4. Balance washer; 41. Counterweight hole; 42. Second positioning boss;

[0036] 5. Second anti-rotation structure; 51. Second anti-rotation pin;

[0037] 6. Clamping screw; 61. Radial boss; 62. Screw;

[0038] 7. Tighten the nut;

[0039] 8. Protective cover. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0041] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0042] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0043] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0044] Reference Figure 1 , Figure 2 , Figure 3 As shown, a structure for on-site dynamic balancing of a magnetic levitation compressor rotor according to this utility model includes:

[0045] A magnetic levitation motor, the output end of which is provided with a motor main shaft 1, and a bushing is fitted on the outer diameter of the motor main shaft 1;

[0046] Impeller 2 is connected to the motor main shaft 1. The impeller 2 includes a first end and a second end that are axially opposite to each other. A first anti-rotation structure 3 is provided between the first end of the impeller 2 and the end face of the motor main shaft 1.

[0047] A balance washer 4 is disposed at the second end of the impeller 2 and a second anti-rotation structure 5 is disposed between the two. A plurality of counterweight holes 41 for installing counterweight blocks are distributed circumferentially along the balance washer 4.

[0048] By setting a balance washer 4 at the front end of the impeller 2 and using an adjustable counterweight with circumferentially distributed counterweight holes 41, precise dynamic balance adjustment is achieved. This method is simple in structure, easy to operate, and has a low implementation cost. Simultaneously, the use of a first anti-rotation structure 3 and a second anti-rotation structure 5 ensures that the assembly direction of the main components is unique, eliminating the need for rebalancing during subsequent maintenance and significantly improving maintenance convenience and equipment operational stability.

[0049] In one embodiment, refer to Figure 2 As shown, the first anti-rotation structure 3 includes a first anti-rotation pin 31.

[0050] In one embodiment, refer to Figure 2 , Figure 3 As shown, it also includes a clamping screw 6 and a locking nut 7; an axially extending positioning screw hole 13 is provided along the middle of the end face of the motor main shaft 1, and a central through hole 23 is provided along the axial direction of the impeller 2; the clamping screw 6 includes a first end and a second end arranged axially opposite to each other, the first end of the clamping screw 6 passes through the central through hole 23 and is threaded into the positioning screw hole 13, and the second end of the clamping screw 6 passes through the balance washer 4; the locking nut 7 is connected to the second end of the clamping screw 6 and presses the balance washer 4 against the second end of the impeller 2, thereby connecting the impeller 2 and the motor main shaft 1 together.

[0051] Specifically, refer to Figure 3 As shown, a protective sleeve 8 is provided to prevent the counterweight from detaching during high-speed operation. The protective sleeve 8 surrounds the outer periphery of the balance washer 4 and the second end of the clamping screw 6. The protective sleeve 8 includes a first end and a second end arranged axially opposite each other. The first end of the protective sleeve 8 is annular and abuts against the outer end of the counterweight hole 41 (or the counterweight) to prevent the counterweight from detaching. By providing the protective sleeve 8, it is ensured that the counterweight will not fall off due to centrifugal force or vibration during high-speed operation, thereby improving the safety and reliability of equipment operation.

[0052] The second anti-rotation structure 5 includes a second anti-rotation pin 51, which is connected between the second end of the impeller 2, the balance washer 4, and the first end of the protective sleeve 8. The second end of the protective sleeve 8 is provided with a connecting hole, and the connecting hole is connected to a screw 62 that abuts against the end of the clamping screw 6.

[0053] By employing a first anti-rotation pin 31 and a second anti-rotation pin 51, it is ensured that key components such as impeller 2, balance washer 4, and protective sleeve 8 maintain their original relative orientation after assembly and disassembly, eliminating the need for re-balancing tests. During maintenance, when disassembling and reassembling impeller 2, the unchanged assembly orientation of key components reduces the amount of additional debugging work after maintenance, improving maintenance efficiency.

[0054] Specifically, the locking nut 7 is a round nut. By replacing the hexagonal nut with a round nut, the structural characteristics of the round nut ensure that it will hardly affect the dynamic balance.

[0055] In one embodiment, refer to Figure 2 As shown, the motor spindle 1 has a first positioning hole 11 on its end face, and the first end of the impeller 2 extends a first positioning boss 21 that is suitable for positioning and cooperating with the first positioning hole 11.

[0056] Specifically, a second positioning hole 12 extends inward from the first positioning hole 11. The diameter of the second positioning hole 12 is smaller than that of the first positioning hole 11. A radial boss 61, which is accommodated in the second positioning hole 12, is provided along the clamping screw 6. The radial boss 61 can abut against the first positioning boss 21 when the clamping screw 6 is screwed out. This allows the radial boss 61 to automatically act on the impeller 2 and push the impeller 2 out of the first positioning hole 11 of the motor main shaft 1 when the impeller 2 is disassembled, facilitating the disassembly of the impeller 2, avoiding potential damage and inconvenience during traditional disassembly, improving maintenance efficiency, and reducing compressor downtime.

[0057] In one embodiment, refer to Figure 3 As shown, the second end of the impeller 2 is provided with a third positioning hole 22, and the balance washer 4 extends axially with a second positioning boss 42 suitable for positioning and cooperating with the third positioning hole 22.

[0058] In one embodiment, the counterweight hole 41 is a threaded hole, and the counterweight is threadedly connected to the counterweight hole 41. It is understood that during field testing, different quantities / masses of counterweights can be installed or replaced using the threaded connection method based on the dynamic balance test results to ensure adjustment accuracy.

[0059] In one embodiment, 8 to 16 counterweight holes 41 are evenly distributed along the circumference of the balance washer 4. During the dynamic balancing experiment on site, different numbers / masses of counterweights are screwed in as needed.

[0060] This dynamic balancing structure features a compact design including a bushing, impeller 2, balancing washer 4, clamping screw 6, and locking nut 7. Compared to traditional weight-reduction methods, it eliminates the need for complex machining equipment and specialized laboratories for dynamic balancing adjustments. The main components are all conventionally machined parts, resulting in a relatively simple manufacturing process and effectively reducing production costs.

[0061] When the device is in operation, it uses a vibration measurement system to detect the vibration of the rotor during rotation to determine if there is any mass imbalance.

[0062] Based on the test data, install a suitable mass / number of counterweights in the counterweight hole 41 of the balance washer 4, and ensure stability through threaded connection.

[0063] The position and number of counterweights can be adjusted according to the dynamic balancing requirements. Usually, 8 to 16 counterweight holes 41 are evenly distributed in the circumference to ensure the best dynamic balancing effect.

[0064] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A structure for field balancing of a magnetic levitation compressor rotor, characterized in that, The utility model relates to a magnetic suspension motor, which comprises a motor shaft (1) arranged at the output end of the motor, a impeller (2) connected to the motor shaft (1), a first anti-rotation structure (3) arranged between the first end of the impeller (2) and the end face of the motor shaft (1), a balance washer (4) arranged at the second end of the impeller (2) and having a second anti-rotation structure (5) arranged therebetween, and a plurality of counterweight holes (41) for mounting counterweights distributed along the balance washer (4). The first anti-rotation structure (3) comprises a first anti-rotation pin (31). The utility model further comprises a compression screw (6) and a locking nut (7). An axially extending positioning screw hole (13) is arranged at the middle of the end face of the motor shaft (1), and a central through hole (23) is arranged axially along the impeller (2).

2. A structure for field balancing of a magnetically suspended compressor rotor according to claim 1, characterized in that The compression screw (6) comprises a first end and a second end arranged axially opposite to each other, the first end of the compression screw (6) passes through the central through hole (23) and is threadedly connected in the positioning screw hole (13), and the second end of the compression screw (6) passes through the balance washer (4).

3. A structure for field balancing of a magnetically suspended compressor rotor according to claim 1, characterized in that The locking nut (7) is connected to the second end of the compression screw (6) and compresses the balance washer (4) to the second end of the impeller (2). The utility model further comprises a protective sleeve (8). The protective sleeve (8) surrounds the outer periphery of the balance washer (4) and the second end of the compression screw (6). The protective sleeve (8) comprises a first end and a second end arranged axially opposite to each other, the first end of the protective sleeve (8) is annular and abuts against the outer end of the counterweight hole (41) to prevent the counterweight from falling out.

4. A structure for field balancing of a magnetically suspended compressor rotor according to claim 3, characterized in that The second anti-rotation structure (5) comprises a second anti-rotation pin (51) connected between the second end of the impeller (2), the balance washer (4) and the first end of the protective sleeve (8). The second end of the protective sleeve (8) is provided with a connecting hole, and a screw (62) is connected to the end of the compression screw (6). The locking nut (7) is a round nut. The end face of the motor shaft (1) is provided with a first positioning hole (11), and the first end of the impeller (2) extends a first positioning boss (21) adapted to be positioned and matched with the first positioning hole (11). The first positioning hole (11) extends inwardly a second positioning hole (12) with a smaller diameter than the first positioning hole (11), and a radial boss (61) is arranged along the compression screw (6) and accommodated in the second positioning hole (12), and the radial boss (61) can abut against the first positioning boss (21) when the compression screw (6) is unscrewed.

5. A structure for field balancing of a magnetically suspended compressor rotor according to claim 3, characterized in that The second end of the impeller (2) is provided with a third positioning hole (22), and the balance washer (4) axially extends a second positioning boss (42) adapted to be positioned and matched with the third positioning hole (22).

6. A structure for field balancing of a magnetically suspended compressor rotor according to claim 3, characterized in that The counterweight hole (41) is a threaded hole, and the counterweight is threadedly connected to the counterweight hole (41).

7. A structure for field balancing of a magnetically suspended compressor rotor according to claim 6, characterized in that ​ 8. A structure for field balancing of a magnetically suspended compressor rotor according to claim 1, characterized in that ​ 9. A structure for field balancing of a magnetically suspended compressor rotor as claimed in claim 1, wherein, ​ 10. A structure for field balancing of a magnetically suspended compressor rotor as claimed in claim 1, wherein, 8~16 of the counterweight holes (41) are evenly distributed along the balance washer (4) in a ring direction.

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