A connection structure between an impeller and a high-speed shaft for a steam compressor

Abstract

The present application relates to a connection structure between an impeller and a high-speed shaft for a steam compressor, and relates to the technical field of steam compressors. A connection structure between an impeller and a high-speed shaft for a steam compressor comprises an impeller body and a shaft body; a connecting shaft is provided at one end of the shaft body close to the impeller body, and an end of the connecting shaft away from the shaft body passes through the impeller body; a clamping block is provided on the side wall of the connecting shaft, and a clamping notch for the clamping block to slide into the inner side wall of the impeller body; a fastening assembly for fixing the impeller body and the connecting shaft is provided at one end of the impeller body away from the shaft body. The present application has the effect of enhancing the detachability of the impeller and the high-speed shaft while ensuring the stable connection between the impeller and the high-speed shaft.

Description

Technical Field

[0001] The present application relates to the technical field of steam compressors, and in particular to a connection structure between an impeller and a high-speed shaft of a steam compressor. Background Art

[0002] A steam compressor consists of three basic components: the compression system, the steam cooler, and the lubrication system. The compression system is the key technology used to increase steam temperature in a steam compressor. Its operating principle is to increase steam pressure and temperature through a high-speed impeller. Therefore, a stable connection between the impeller and the high-speed shaft is essential for the efficient and stable operation of the steam compressor.

[0003] In related art, the impeller and high-speed shaft are typically connected using an interference fit. To minimize loosening of the impeller and the high-speed shaft during the high-speed rotation of the impeller, a larger interference fit is required. Furthermore, during installation, the impeller and high-speed shaft are typically installed using a shrink fit method, which involves heating the impeller or the high-speed shaft to a higher temperature to achieve an interference fit.

[0004] In the related art, the connection methods between the high-speed shaft and the impeller are mainly as follows: 1. Interference fit between the high-speed shaft and the impeller. This connection method is stable and reliable, but has poor disassembly and causes great trouble for the subsequent maintenance of the steam compressor;

[0005] With respect to the above-mentioned related technologies, the inventors found that the interference fit connection method between the impeller and the high-speed shaft has poor detachability, which causes great trouble for the subsequent inspection and maintenance of the steam compressor, and thus needs to be improved. Summary of the Invention

[0006] In order to enhance the detachability of the impeller and the high-speed shaft while ensuring the stable connection between the impeller and the high-speed shaft, the present application provides a connection structure between the impeller and the high-speed shaft for a steam compressor.

[0007] The present application provides a connection structure between an impeller and a high-speed shaft for a steam compressor, which adopts the following technical solution:

[0008] A connection structure between an impeller and a high-speed shaft for a steam compressor comprises an impeller body and a shaft body; a connecting shaft is provided at one end of the shaft body close to the impeller body, and an end of the connecting shaft away from the shaft body passes through the impeller body; a clamping block is provided on the side wall of the connecting shaft, and a clamping notch is provided on the inner side wall of the impeller body for the clamping block to slide into; a fastening assembly for fixedly connecting the impeller body and the connecting shaft is provided at one end of the impeller body away from the shaft body.

[0009] By adopting the above technical solution, when the connecting shaft passes through the impeller body, the clamping block is pushed into the clamping notch, and then the impeller body and the connecting shaft are fixedly connected by the fastening assembly, so that the clamping block is stably pressed against the inside of the clamping notch; the clamping block is pressed against the inner side wall of the clamping notch to realize the force transmission between the connecting shaft and the impeller body, thereby realizing the force transmission between the shaft body and the impeller body, and then realizing the fixed connection between the shaft body and the impeller body; when maintenance is required, the fastening assembly can be removed to realize the rapid disassembly of the shaft body and the impeller body, thereby increasing the disassembly of the impeller body and the shaft body.

[0010] Preferably, the cross-sectional area of ​​the clamping block along the radial direction of the connecting shaft gradually decreases toward the impeller body, and the clamping block and the clamping notch are adapted to each other.

[0011] By adopting the above technical solution, when the clamping block is inserted into the clamping notch, the end of the clamping block close to the impeller body is smaller than the end of the clamping notch close to the shaft body, so that the clamping block can be quickly inserted into the clamping notch, thereby realizing the rapid assembly of the impeller body and the connecting shaft and improving the convenience of assembling the impeller body and the shaft body.

[0012] Preferably, the fastening assembly includes a fastening ring and a limiting bolt; the fastening ring is threadedly connected to the outside of the connecting shaft, and the fastening ring is abutted against the side wall of the impeller body away from the shaft body; the limiting bolt is passed through the fastening ring, and the limiting bolt is threadedly connected to the impeller body.

[0013] By adopting the above technical solution, the fastening ring and the connecting shaft are threadedly connected, and the fastening ring and the impeller body are offset against each other, thereby achieving a tight connection between the connecting shaft and the impeller body; the fastening ring and the impeller body are offset against each other, so that the connecting shaft exerts a force on the shaft body toward the impeller body, and the fastening ring exerts a force on the impeller body toward the direction of the shaft body, thereby achieving a tight connection between the impeller body and the shaft body; the fastening ring and the impeller body are fixedly connected by the limiting bolt, which limits the relative rotation of the fastening ring and the connecting shaft, thereby improving the connection stability of the fastening ring, the connecting shaft and the impeller body.

[0014] Preferably, a connecting block is provided at one end of the connecting shaft close to the shaft body, a connecting groove for the connecting block and the connecting shaft to be inserted into the side wall of the shaft body facing the impeller body, a rotating notch for the connecting shaft to drive the connecting block to rotate is provided on the inner side wall of the connecting groove, and a limiting groove for the connecting block to be inserted into is provided on the inner side wall of the rotating notch facing away from the impeller body; the shaft body is abutted against the impeller body, and a clearance notch for the clamping block to be inserted into is provided on the side wall of the shaft body close to the impeller body.

[0015] By adopting the above technical solution, the connecting shaft and the connecting block are pushed into the connecting groove. When the connecting block is pushed into the rotating notch, the connecting shaft is rotated to make the connecting block rotate inside the rotating notch, and the connecting shaft and the connecting block are moved in the direction of leaving the connecting groove to push the connecting block into the limiting groove; the connecting block and the inner side wall of the limiting groove are pushed against each other to fix the shaft body and the impeller body, and the transmission of the action force between the shaft body and the impeller body is realized, so that the shaft body drives the impeller body to rotate; at the same time, the clamping block follows the connecting shaft to be pushed into the clearance notch and rotates, reducing the interference and obstruction caused by the clamping block during the installation of the connecting shaft and the shaft body.

[0016] Preferably, a closing sleeve is provided at one end of the connecting shaft away from the shaft body, the side wall of the closing sleeve close to the impeller body is against the impeller body, the inner wall of the closing sleeve is threadedly connected to the outer wall of the fastening ring, and the thread direction of the inner wall of the closing sleeve is opposite to the thread direction of the inner wall of the fastening ring.

[0017] By adopting the above technical solution, the closing sleeve covers the connecting shaft, reducing the corrosion of the connecting shaft itself and the connection between the connecting shaft and the impeller body by external objects, thereby ensuring the service life of the connecting shaft; by screwing the closing sleeve and the fastening ring in opposite directions, the closing sleeve and the fastening ring can exert force on each other to achieve self-locking of the closing sleeve and the fastening ring, thereby improving the installation stability of the closing sleeve and the fastening ring.

[0018] Preferably, an inner side wall of the sealing sleeve is provided with an abutment groove for the end of the connecting shaft away from the shaft body to abut, and the inner side wall of the abutment groove is provided with a flexible pad that fits tightly with the side wall of the connecting shaft.

[0019] By adopting the above technical solution, the end of the connecting shaft is pressed into the inside of the abutment groove, which reduces the shaking of the end of the connecting shaft when the shaft body rotates at high speed, and improves the stability of the connecting shaft; the flexible pad makes the inner side wall of the abutment groove and the connecting shaft more tightly connected. At the same time, the flexible pad reduces the hard collision between the connecting shaft and the closing sleeve, thereby improving the connection stability of the connecting shaft and the closing sleeve.

[0020] Preferably, a protective sleeve is provided on the outside of the shaft body, the outer wall of the shaft body and the inner wall of the protective sleeve are in contact with each other, the outer wall of the protective sleeve is provided with a mounting ring plate, and the mounting ring plate and the impeller body are jointly provided with fixing bolts for fixing the mounting ring plate and the impeller body.

[0021] By adopting the above technical solution, the protective sleeve reduces the corrosion of the shaft by external substances and ensures the service life of the shaft; by fixing the bolts and installing the ring plate, the protective sleeve and the impeller body can be quickly disassembled and assembled, so as to facilitate subsequent inspection and maintenance.

[0022] Preferably, a transition ring is provided between the mounting ring plate and the protective sleeve, and the inner diameter of the transition ring gradually decreases in the direction away from the impeller body; a fixing ring is provided around the shaft body on the side wall of the impeller body facing the shaft body, and the inner side wall of the fixing ring is in contact with the outer side wall of the shaft body, and the outer side wall of the fixing ring is in contact with the inner side wall of the transition ring.

[0023] By adopting the above technical solution, the transition ring and the fixed ring fit tightly together, which increases the path and difficulty for foreign matter to contact the shaft through the gap between the mounting ring plate and the impeller body, thereby reducing the corrosion of the shaft by foreign matter and ensuring the service life of the shaft; at the same time, the fitting surface between the transition ring and the fixed ring is inclined, which increases the difficulty for foreign matter to contact the shaft through the gap between the mounting ring plate and the impeller body, further reducing the possibility of corrosion of the shaft by foreign matter, thereby ensuring the service life of the shaft.

[0024] Preferably, the outer wall of the fixing ring is provided with several groups of ring channels, all of which are coaxially arranged and arranged along the axial direction of the fixing ring; the inner wall of the transition ring is provided with several groups of snap rings, the snap rings and the ring channels correspond one to one, and each of the snap rings fits tightly with the inner wall of the corresponding ring channel.

[0025] By adopting the above technical solution, the annular channel and the clamping ring fit together, further increasing the path and difficulty for foreign matter to contact the shaft through the gap between the mounting ring plate and the impeller body, thereby reducing the corrosion of the shaft by foreign matter and ensuring the service life of the shaft.

[0026] Preferably, the inner side wall of each of the annular channels is provided with a sealing ring, and the outer side wall of each of the clamping rings is provided with an abutting ring groove for the sealing ring to abut against.

[0027] By adopting the above technical solution, the sealing ring is pressed into the corresponding abutment ring groove, which further increases the air tightness of the connection between the transition ring and the fixed ring, reduces the path and difficulty of foreign matter contacting the shaft through the gap between the mounting ring plate and the impeller body, thereby reducing the corrosion of the shaft by foreign matter and ensuring the service life of the shaft.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. By setting up a fastening component, the connecting shaft and the impeller body are tightly connected, and the fixed connection between the impeller body and the shaft is realized. The clamping block is abutted against the inner side wall of the clamping notch to realize the force transmission between the connecting shaft and the impeller body, thereby realizing the force transmission between the shaft body and the impeller body, and further realizing the fixed connection between the shaft body and the impeller body; when maintenance is required, the fastening component can be removed to realize the rapid disassembly of the shaft body and the impeller body, thereby increasing the disassembly of the impeller body and the shaft body.

[0030] 2. By setting the connecting block, connecting groove, rotating notch and limiting groove, the detachable connection between the connecting shaft and the shaft body is achieved, which provides convenience for subsequent maintenance and replacement of parts.

[0031] 3. By providing a protective sleeve, a transition ring and a fixed ring, the corrosion of the shaft by foreign substances is reduced; by providing a ring channel, a clamping ring and a sealing ring, the air tightness of the connection between the protective sleeve and the impeller body is improved, and the path and difficulty of foreign substances contacting the shaft through the gap between the mounting ring plate and the impeller body are increased, thereby further reducing the possibility of corrosion of the shaft by foreign substances and ensuring the service life of the shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural schematic diagram of a connection structure between an impeller and a high-speed shaft for a steam compressor according to an embodiment of the present application.

[0033] Figure 2 It is a cross-sectional diagram used to reflect the internal structure of the impeller body and shaft.

[0034] Figure 3 It is an exploded diagram used to illustrate the positional relationship between the impeller body, shaft body and connecting shaft.

[0035] Figure 4 It is an exploded diagram showing the internal structure of the shaft.

[0036] Figure 5 It is used to reflect Figure 2 A magnified schematic diagram of the structure in the middle.

[0037] Description of reference numerals:

[0038] 1. Impeller body; 11. Snap-fit ​​notch; 12. Fixing ring; 121. Ring channel; 122. Sealing ring; 2. Shaft; 21. Connecting groove; 22. Rotating notch; 23. Limiting groove; 24. Clearance notch; 3. Connecting shaft; 31. Snap-fit ​​block; 32. Connecting block; 4. Fastening assembly; 41. Fastening ring; 42. Limiting bolt; 5. Closing sleeve; 51. Abutment groove; 511. Flexible pad; 6. Protective sleeve; 61. Mounting ring plate; 611. Fixing bolt; 62. Transition ring; 621. Snap-fit ​​ring; 622. Abutment ring groove. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-5 This application is described in further detail.

[0040] An embodiment of the present application discloses a connection structure between an impeller and a high-speed shaft for a steam compressor, which aims to enhance the detachability of the impeller and the high-speed shaft while ensuring a stable connection between the impeller and the high-speed shaft.

[0041] Reference Figure 1 and Figure 2 A connection structure between an impeller and a high-speed shaft for a steam compressor includes an impeller body 1 and a shaft body 2; a connecting shaft 3 is mounted on the end of the shaft body 2 close to the impeller body 1, and the end walls of the shaft body 2 and the impeller body 1 close to each other are in contact with each other. The end of the connecting shaft 3 away from the shaft body 2 passes through the impeller body 1, and the outer diameter of the connecting shaft 3 is compatible with the inner diameter of the impeller body 1. A clamping block 31 is integrally formed on the side wall of the connecting shaft 3. In this embodiment, two groups of clamping blocks 31 are symmetrically distributed along the central axis of the connecting shaft 3, and the area of ​​each group of clamping blocks 31 along the radial cross-section of the connecting shaft 3 gradually decreases toward the impeller body 1. A clamping notch 11 is formed on the inner side wall of the impeller body 1 for the clamping block 31 to slide into along the axial direction of the impeller body 1, and the clamping notch 11 is compatible with the clamping block 31. A fastening assembly 4 is mounted on the end of the connecting shaft 3 away from the shaft body 2 for fixedly connecting the impeller body 1 and the connecting shaft 3.

[0042] Reference Figure 3 and Figure 4 A connecting block 32 is integrally formed on the sidewall of the connecting shaft 3 near one end of the shaft body 2. In this embodiment, two groups of connecting blocks 32 are symmetrically distributed along the axial cross-section of the connecting shaft 3. A connecting groove 21 is defined along the length of the shaft body 2 on the sidewall of the shaft body 2 facing the impeller body 1, allowing the connecting shaft 3 to drive the connecting blocks 32 to gradually enter the shaft body 2 along its axial direction.

[0043] Reference Figure 2 and Figure 3 The inner sidewall of the connecting groove 21 is provided with a rotational notch 22, which facilitates the connecting shaft 3 to drive the connecting block 32 to rotate about the central axis of the shaft body 2. A limiting groove 23 is defined along the axial direction of the shaft body 2 on the inner sidewall of the rotational notch 22, facing away from the impeller body 1. This allows the connecting block 32 to abut against the limiting groove 23 when the connecting shaft 3 drives the connecting block 32 toward the impeller body 1. In this embodiment, the limiting groove 23 and the connecting block 32 are mutually adapted to limit the rotation of the connecting block 32 about the connecting shaft 3.

[0044] Reference Figure 2 and Figure 3The side wall of the shaft body 2 facing the impeller body 1 is provided with a clearance notch 24 along the length of the shaft body 2, so that when the connecting shaft 3 drives the connecting block 32 to move toward the interior of the connecting groove 21, the engaging notch 11 abuts against the inside of the clearance notch 24. At the same time, when the connecting shaft 3 drives the connecting block 32 to rotate within the rotation notch 22, the engaging block 31 can also rotate within the clearance notch 24.

[0045] Reference Figure 2 The fastening assembly 4 includes a fastening ring 41 and a limiting bolt 42. The sidewall of the connecting shaft 3, away from the shaft body 2, is threaded. The fastening ring 41 is threadedly connected to the end of the connecting shaft 3 away from the shaft body 2, and the fastening ring 41 abuts against the adjacent sidewalls of the impeller body 1. The limiting bolt 42 is inserted into the fastening ring 41 and extends through one end of the fastening ring 41 to be threadedly connected to the impeller body 1, thereby limiting the fastening ring 41 from rotating relative to the connecting shaft 3.

[0046] Reference Figure 2 The fastening assembly 4 makes the connecting block 32 stably abut against the inside of the limiting groove 23, and makes the side walls of the shaft body 2 and the impeller body 1 close to each other abut against each other, so that the clamping block 31 stably abuts against the inside of the clamping notch 11, thereby realizing a tight connection between the impeller body 1 and the shaft body 2.

[0047] Reference Figure 2 A sealing sleeve 5 is mounted on the end of the connecting shaft 3 away from the shaft body 2. The outer wall of the fastening ring 41 is threaded, allowing the sealing sleeve 5 to be threadedly connected to the exterior of the fastening ring 41. In this embodiment, the threads on the inner wall of the sealing sleeve are in the opposite direction to those on the inner wall of the fastening ring 41. The sealing sleeve 5 is tightly fitted against the adjacent side walls of the impeller body 1, thereby covering the end of the connecting shaft 3 exposed outside the impeller body 1.

[0048] Reference Figure 2 The inner sidewall of the sealing sleeve 5 is provided with an abutment groove 51 for the end of the connecting shaft 3 away from the shaft body 2 to abut against. Furthermore, a flexible pad 511 is adhesively bonded to the inner sidewall of the abutment groove 51. In this embodiment, the flexible pad 511 can be made of rubber. When the end of the connecting shaft 3 is inserted into the abutment groove 51, the flexible pad 511 fits tightly against the sidewall of the connecting shaft 3.

[0049] Reference Figure 2 and Figure 3 A protective sleeve 6 is sleeved onto the exterior of the shaft 2, with the outer wall of the shaft 2 and the inner wall of the protective sleeve 6 fitting together. In this embodiment, the protective sleeve 6 can be made of stainless steel. A transition ring 62 is integrally formed on the sidewall of the protective sleeve 6 near the impeller body 1, and the inner diameter of the transition ring 62 gradually increases as it approaches the impeller body 1.

[0050] Reference Figure 2 and Figure 3 A retaining ring 12 is integrally formed on the side wall of the impeller body 1 facing the shaft body 2. The shaft body 2 is located within the retaining ring 12, and the outer wall of the shaft body 2 is tightly fitted with the inner wall of the retaining ring 12. In this embodiment, the outer diameter of the retaining ring 12 gradually decreases away from the impeller body 1, and the outer wall of the retaining ring 12 is tightly fitted with the inner wall of the transition ring 62.

[0051] Reference Figure 2 and Figure 5 The outer wall of the fixing ring 12 is provided with a plurality of groups of ring channels 121 along the circumference of the fixing ring 12. All the ring channels 121 are coaxial and distributed along the length of the fixing ring 12. A sealing ring 122 is adhesively bonded to the inner wall of each group of ring channels 121. In this embodiment, the sealing ring 122 can be made of soft rubber.

[0052] Reference Figure 2 and Figure 5 The inner sidewall of the transition ring 62 is integrally formed with several sets of snap rings 621. The snap rings 621 correspond one to one with the annular channel 121 and the sealing ring 122, and each set of snap rings 621 fits tightly against the inner sidewall of the corresponding annular channel 121. The outer sidewall of each set of snap rings 621 is provided with an abutment groove 622 along the circumference of the snap ring 621, which allows the end of the sealing ring 122 away from the snap ring 621 to abut against and fill the interior of the abutment groove 622.

[0053] Reference Figure 2 and Figure 5 A mounting ring plate 61 is integrally formed at the end of the transition ring 62 closest to the impeller body 1. The mounting ring plate 61 fits tightly against the adjacent sidewalls of the impeller body 1. Several fixing bolts 611 are inserted through the mounting ring plate 61. All fixing bolts 611 are spaced apart along the circumference of the mounting ring plate 61. Each set of fixing bolts 611, which penetrate one end of the mounting ring plate 61, is threadedly connected to the impeller body 1, thereby securing the mounting ring plate 61 to the impeller body 1.

[0054] The implementation principle of the connection structure between the impeller and the high-speed shaft of a steam compressor in the embodiment of the present application is as follows:

[0055] Push the connecting shaft 3 and the connecting block 32 into the connecting groove 21. When the connecting block 32 is pushed into the rotating notch 22, rotate the connecting shaft 3 and the connecting block 32, and then move the connecting shaft 3 and the connecting block 32 toward the direction close to the impeller body 1 to push the connecting block 32 into the limiting groove 23.

[0056] Pass the connecting shaft 3 through the impeller body 1 and insert the clamping block 31 into the clamping notch 11. Then, thread the fastening ring 41 onto the connecting shaft 3 and securely connect the fastening ring 41 to the impeller body 1 with the limiting bolts 42. The fastening ring 41 abuts against the impeller body 1, exerting a force on the connecting shaft 3 and the connecting block 32 toward the impeller body 1, so that the connecting block 32 is stably abutted against the limiting groove 23.

[0057] The connecting block 32 applies a force to the shaft 2 toward the impeller body 1, and the fastening ring 41 applies a force to the impeller body 1 toward the shaft 2, so that the impeller body 1 and the shaft 2 fit tightly together. At the same time, the clamping block 31 stably abuts against the inside of the clamping notch 11, thereby achieving a stable connection between the impeller body 1 and the shaft 2. The clamping block 31 abuts against the inner sidewall of the clamping notch 11, so that the impeller body 1 and the shaft 2 can transmit the force. At the same time, the impeller body 1 and the shaft 2 can be quickly disassembled by removing the fastening ring 41 and the limit bolt 42, thereby increasing the detachability of the connection between the impeller body 1 and the shaft 2.

[0058] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A connection structure between an impeller and a high-speed shaft for a steam compressor, comprising an impeller body (1) and a shaft body (2); characterized in that: A connecting shaft (3) is provided at one end of the shaft body (2) close to the impeller body (1); an end of the connecting shaft (3) away from the shaft body (2) passes through the impeller body (1); a clamping block (31) is provided on the side wall of the connecting shaft (3); and a clamping notch (11) for the clamping block (31) to slide into is provided on the inner side wall of the impeller body (1); a fastening assembly (4) for fixedly connecting the impeller body (1) and the connecting shaft (3) is provided at one end of the impeller body (1) away from the shaft body (2); The fastening assembly (4) comprises a fastening ring (41) and a limiting bolt (42); the fastening ring (41) is threadedly connected to the outside of the connecting shaft (3), and the fastening ring (41) abuts against the side wall of the impeller body (1) away from the shaft body (2); the limiting bolt (42) is passed through the fastening ring (41), and the limiting bolt (42) is threadedly connected to the impeller body (1); A connecting block (32) is provided at one end of the connecting shaft (3) close to the shaft body (2); a connecting groove (21) is provided on the side wall of the shaft body (2) facing the impeller body (1) for the connecting block (32) and the connecting shaft (3) to be pressed into; a rotating notch (22) is provided on the inner side wall of the connecting groove (21) for the connecting shaft (3) to drive the connecting block (32) to rotate; a limiting groove (23) is provided on the inner side wall of the rotating notch (22) facing away from the impeller body (1) for the connecting block (32) to be pressed into; the shaft body (2) and the impeller body (1) are pressed against each other; a clearance notch (24) is provided on the side wall of the shaft body (2) close to the impeller body (1) for the clamping block (31) to be pressed into.

2. The connection structure between an impeller and a high-speed shaft for a steam compressor according to claim 1, characterized in that: The cross-sectional area of ​​the clamping block (31) along the radial direction of the connecting shaft (3) gradually decreases toward the direction approaching the impeller body (1), and the clamping block (31) and the clamping notch (11) are adapted to each other.

3. The connection structure between an impeller and a high-speed shaft for a steam compressor according to claim 1, characterized in that: A sealing sleeve (5) is provided at one end of the connecting shaft (3) away from the shaft body (2); the sealing sleeve (5) is close to the side wall of the impeller body (1) and abuts against the impeller body (1); the inner side wall of the sealing sleeve (5) is threadedly connected to the outer side wall of the fastening ring (41), and the thread direction of the inner side wall of the sealing sleeve (5) is opposite to the thread direction of the inner side wall of the fastening ring (41).

4. The connection structure between an impeller and a high-speed shaft for a steam compressor according to claim 3, characterized in that: The inner side wall of the sealing sleeve (5) is provided with an abutment groove (51) for the end of the connecting shaft (3) away from the shaft body (2) to abut against, and the inner side wall of the abutment groove (51) is provided with a flexible pad (511) that is tightly fitted with the side wall of the connecting shaft (3).

5. The connection structure between an impeller and a high-speed shaft for a steam compressor according to claim 1, characterized in that: The shaft body (2) is externally sleeved with a protective sleeve (6), the outer side wall of the shaft body (2) and the inner side wall of the protective sleeve (6) are in contact with each other, the outer side wall of the protective sleeve (6) is provided with a mounting ring plate (61), and the mounting ring plate (61) and the impeller body (1) are both provided with fixing bolts (611) for fixing the mounting ring plate (61) and the impeller body (1).

6. The connection structure between an impeller and a high-speed shaft for a steam compressor according to claim 5, characterized in that: A transition ring (62) is provided between the mounting ring plate (61) and the protective sleeve (6), and the inner diameter of the transition ring (62) gradually decreases in the direction away from the impeller body (1); a fixing ring (12) is provided around the shaft body (2) on the side wall of the impeller body (1) facing the shaft body (2), and the inner side wall of the fixing ring (12) is in contact with the outer side wall of the shaft body (2), and the outer side wall of the fixing ring (12) is in contact with the inner side wall of the transition ring (62).

7. The connection structure between an impeller and a high-speed shaft for a steam compressor according to claim 6, characterized in that: The outer side wall of the fixing ring (12) is provided with a plurality of groups of ring channels (121), all of the ring channels (121) are coaxially arranged, and all of the ring channels (121) are arranged along the axial direction of the fixing ring (12); the inner side wall of the transition ring (62) is provided with a plurality of groups of snap rings (621), the snap rings (621) and the ring channels (121) correspond one to one, and each of the snap rings (621) is tightly fitted with the inner side wall of the corresponding ring channel (121).

8. The connection structure between an impeller and a high-speed shaft for a steam compressor according to claim 7, characterized in that: The inner side wall of each annular channel (121) is provided with a sealing ring (122), and the outer side wall of each clamping ring (621) is provided with an abutting ring groove (622) for the sealing ring (122) to abut.

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