Balancing disc locking device and centrifugal compressor

Abstract

This utility model discloses a balance disc locking device and a centrifugal compressor, belonging to the technical field of centrifugal compressors. The balance disc locking device is used in a centrifugal compressor, which includes a main shaft and an impeller and a balance disc mounted on the main shaft. A groove is formed on the main shaft. The balance disc locking device includes a shear ring, a retaining ring, multiple fixing components, and multiple fastening components. The shear ring is disposed within the groove; the retaining ring is disposed on the main shaft and located on the outer periphery of the shear ring. Multiple through-holes are formed on the retaining ring along the axial direction of the main shaft. Multiple second holes are formed on the balance disc, and multiple through-holes are formed on the retaining ring. Multiple fixing components secure the retaining ring to the balance disc through the first and second holes. The fastening components pass through the corresponding third holes and their ends abut against the shear ring. This utility model solves the problems of cumbersome manufacturing and complicated disassembly / assembly of existing balance disc locking devices.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal compressor technology, and in particular to a balance disc locking device and a centrifugal compressor. Background Technology

[0002] Currently, some centrifugal compressors suitable for media with large molecular weights or high pressures have multiple single-cylinder stages, and their impellers typically adopt a parallel arrangement. To improve the operational stability of these centrifugal compressors, such as... Figure 1 As shown, it is necessary to maximize the ratio of the support span L of the rotor-bearing system to the maximum diameter D of the main shaft. Therefore, reducing the axial dimensions of the rotor components is an effective method to optimize the rotor structure and improve stability. The balance disc is the core component for axial force management in a centrifugal compressor, achieving dynamic balance of axial loads by controlling the pressure difference on both sides of the balance disc. Figure 1 , Figure 2 As shown, the existing balance disc 6 and spindle 5 have a keyless interference fit. To prevent axial movement of the balance disc 6, a lock nut 7 is threaded onto the spindle 5, and a set screw 8 is used to prevent the lock nut 7 from loosening. This structure requires machining fine threads on the spindle 5, demanding high precision (grade 5 to 6), which is quite complicated. Furthermore, the installation and removal of the lock nut 7 require special tools, making the process cumbersome. Utility Model Content

[0003] The main purpose of this utility model is to provide a balance disc locking device and a centrifugal compressor, which aims to solve the problems of the existing balance disc locking device being relatively cumbersome to process and difficult to disassemble and assemble.

[0004] To achieve the above objectives, this utility model provides a balance disc locking device for use in a centrifugal compressor. The centrifugal compressor includes a main shaft and an impeller and a balance disc mounted on the main shaft. A groove is formed on the main shaft. The balance disc locking device includes a shear ring, a retaining ring, multiple fixing members, and multiple fastening members. The shear ring is disposed within the groove and is used to cause the balance disc to abut against one side of the impeller. The retaining ring is disposed on the main shaft and located on the outer periphery of the shear ring. Multiple through-holes are formed on the retaining ring along the axial direction of the main shaft. Multiple second holes are formed on the balance disc, each corresponding to one of the first holes. Multiple through-holes are also formed on the retaining ring, with the extension direction of the third holes facing the shear ring. Multiple fixing members correspond to the multiple first holes and secure the retaining ring to the balance disc through the first and second holes. Multiple fastening members correspond to the multiple third holes and pass through the corresponding third holes, with their ends abutting against the shear ring.

[0005] Optionally, the shear ring is provided with a plurality of notches, and the plurality of notches correspond one-to-one with a plurality of fastening members, with the end of the fastening member abutting against the corresponding notch.

[0006] Optionally, the plurality of first holes and the plurality of third holes are staggered on the retaining ring.

[0007] Optionally, the first hole, the second hole, and the third hole are all threaded holes, and the fastener and the setter are all screws.

[0008] Optionally, the width of the groove is 10mm to 13mm, and the depth of the groove is less than the thickness of the shear ring in its radial direction. The width direction of the groove is the same as the axial direction of the main shaft, and the depth direction of the groove is perpendicular to the axial direction of the main shaft.

[0009] Optionally, the spindle and the retaining ring are in transition fit, and the shearing ring and the retaining ring are in clearance fit.

[0010] Optionally, the thickness of the retaining ring in the axial direction of the main shaft is greater than the thickness of the shear ring in the axial direction of the main shaft.

[0011] Optionally, on the side away from the impeller, the angle between the axis of the third hole and the axis of the main shaft is an acute angle; the shearing ring is composed of multiple broken arc segments.

[0012] Optionally, the shearing ring is composed of 6 to 8 of the aforementioned arc segments.

[0013] In addition, to achieve the above objectives, this utility model also provides a centrifugal compressor, including the balance disc locking device described in any of the above claims.

[0014] This utility model discloses a balance disc locking device. During the process of fixing the balance disc to the main shaft, a shearing ring is first placed in a groove on the main shaft, ensuring the shearing ring is stably positioned within the groove. The shearing ring then uses the balance disc to abut against one side of the impeller. Next, a retaining ring is placed on the main shaft, positioned on the outer periphery of the shearing ring. It is important to ensure that the multiple through-holes on the retaining ring along the main shaft axial direction correspond one-to-one with the multiple second holes on the balance disc. Simultaneously, the multiple through-holes on the retaining ring should extend in the direction of the shearing ring. Then, multiple fasteners are passed through the first and second holes to securely fix the retaining ring to the balance disc. Finally, multiple locking members are passed through the corresponding third holes, with the ends of the locking members abutting against the shearing ring, completing the fixing of the balance disc to the main shaft. Throughout the process of fixing the balance disc to the main shaft, it is no longer necessary to machine fine threads on the main shaft, greatly simplifying the machining steps. Furthermore, no special tools are required for assembly and disassembly, making assembly and disassembly much more convenient. Attached Figure Description

[0015] Figure 1 A schematic diagram of the rotor structure of an existing centrifugal compressor;

[0016] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0017] Figure 3 This is a cross-sectional view showing the connection relationship of a balance disc locking device according to this utility model;

[0018] Figure 4 for Figure 3 Schematic diagram of the middle retaining ring;

[0019] Figure 5 for Figure 3 A schematic diagram of the shear ring structure.

[0020] In the diagram, 1 is the shearing ring; 101 is the notch; 2 is the retaining ring; 3 is the fastener; 4 is the setter; 5 is the main shaft; 6 is the balance disc; 7 is the lock nut; 8 is the set screw; and 9 is the impeller.

[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] This utility model relates to a balance disc locking device, which features significant structural optimizations compared to existing balance disc locking devices. Firstly, by creating a groove on the main shaft 5 and installing a shear ring 1, the positioning function of the shear ring 1 ensures that the balance disc 6 accurately abuts against one side of the impeller 9, thereby guaranteeing effective axial force balance. This design avoids the cumbersome step of machining fine threads on the main shaft 5. Secondly, multiple through-holes in the retaining ring 2, including first and second holes, are used to securely fix the retaining ring 2 to the balance disc 6 via the connection of the fastener 3. Simultaneously, multiple through-holes in the retaining ring 2 extend towards the shear ring 1, allowing the fastener 4 to pass through and abut against the shear ring 1, further enhancing the fixing effect of the balance disc 6.

[0027] Please see Figure 3 , Figure 4 as well as Figure 5This utility model provides a balance disc locking device for use in a centrifugal compressor. The centrifugal compressor includes a main shaft 5, an impeller 9 and a balance disc 6 mounted on the main shaft 5. The main shaft 5 has a groove. The balance disc locking device may include: a shear ring 1, a retaining ring 2, multiple fixing members 3 and multiple fastening members 4. The shear ring 1 is disposed in the groove and is used to make the balance disc abut against one side of the impeller 9. The retaining ring 2 is disposed on the main shaft 5 and located on the outer periphery of the shear ring 1. The retaining ring 2 has multiple through first holes along the axial direction of the main shaft 5. The balance disc 6 has multiple second holes, which correspond one-to-one with the multiple first holes. The retaining ring 2 also has multiple through third holes, which extend towards the shear ring 1. The multiple fixing members 3 correspond one-to-one with the multiple first holes and fix the retaining ring 2 to the balance disc 6 through the first and second holes. The multiple fastening members 4 correspond one-to-one with the multiple third holes and pass through the corresponding third holes with their ends abutting against the shear ring 1.

[0028] In this embodiment, during the process of fixing the balance disc 6 to the main shaft 5, the shear ring 1 is first placed in the groove on the main shaft 5, ensuring that the shear ring 1 is stably positioned in the groove, and the balance disc 6 is brought into contact with one side of the impeller 9 using the shear ring 1. Next, the retaining ring 2 is placed on the main shaft 5 at the outer periphery of the shear ring 1. At this time, it is important to note that the multiple through holes on the retaining ring 2 along the axial direction of the main shaft 5 must correspond one-to-one with the multiple second holes on the balance disc 6, and the extension direction of the multiple through holes on the retaining ring 2 should face the shear ring 1. Then, multiple fasteners 3 are passed through the first and second holes to firmly fix the retaining ring 2 to the balance disc 6. Finally, multiple locking members 4 are passed through the corresponding third holes, so that the ends of the locking members 4 abut against the shear ring 1, completing the fixing operation of the balance disc 6 on the main shaft 5. During the entire process of fixing the balance disc 6 to the main shaft 5, it is no longer necessary to machine fine threads on the main shaft 5, which greatly simplifies the processing steps, and no special tools are required for disassembly and assembly, making disassembly and assembly more convenient.

[0029] For example, the thickness of the retaining ring 2 (the thickness along the axial direction of the spindle 5) can be 35mm, the number of first holes can be set to 8, and the corresponding number of second holes is also 8. The number of third holes can be set to 8. By setting 8 first holes and 8 third holes, material waste is avoided while ensuring a stable connection between the retaining ring 2 and the balance disc 6, and a stable connection between the retaining ring 2 and the shear ring 1. At the same time, it simplifies the cumbersome process of disassembling and assembling the retaining ring 2 and the balance disc 6, and the retaining ring 2 and the shear ring 1.

[0030] Please see Figure 5 The shearing ring 1 has multiple notches 101, each notch 101 corresponding to a multiple fastener 4, with the end of the fastener 4 abutting against the corresponding notch 101.

[0031] When the end of the locking member 4 abuts against the corresponding notch 101, the notch 101 can limit the locking member 4 to a certain extent, preventing the locking member 4 from shifting when subjected to external force, thereby ensuring the connection stability between the shear ring 1 and the retaining ring 2, and further ensuring the fixing effect of the balance disc 6 on the main shaft 5.

[0032] For example, the notch 101 can be a V-shaped structure. The notch 101 can be set to 8.

[0033] Furthermore, multiple first holes and multiple third holes are staggered on the retaining ring 2.

[0034] Specifically, the multiple first holes and multiple third holes are staggered on the retaining ring 2. This layout design can effectively ensure that the multiple first holes and multiple third holes on the retaining ring 2 do not interfere with each other, thus ensuring the reliability of the retaining ring 2.

[0035] Furthermore, the first hole, the second hole, and the third hole are all threaded holes, and the fastener 3 and the setter 4 are both screws.

[0036] In this embodiment, when the first, second, and third holes are all designed as threaded holes, and both the fixing member 3 and the setter 4 are made of screws, on the one hand, the connection strength can meet the working requirements of the balance disc locking device, effectively fixing the retaining ring 2 to the balance disc 6, and firmly connecting the setter 4 to the retaining ring 2 and abutting against the shear ring 1. On the other hand, the screw connection facilitates installation and disassembly. When it is necessary to maintain, repair, or replace parts of the balance disc locking device, the operator can conveniently use general tools to tighten or loosen the screws without the need for complicated special tools, greatly improving work efficiency.

[0037] Specifically, the fixing component 3 can be an M10 screw; the setter component 4 can be an M8 screw. In practical applications, M10 and M8 screws are common specifications with relatively low procurement costs, which helps reduce the overall manufacturing cost of the balance disc locking device. At the same time, these two screw specifications can well meet the working requirements of the balance disc locking device in terms of strength and stability.

[0038] Furthermore, the width of the groove is 10mm to 13mm, and the depth of the groove is less than the thickness of the shear ring 1 in its radial direction. The width direction of the groove is the same as the axial direction of the main shaft 5, and the depth direction of the groove is perpendicular to the axial direction of the main shaft 5.

[0039] Specifically, the width of the groove can be 10mm, 11mm, 12mm, 13mm, etc. Designing the depth of the groove to be less than the thickness of the shear ring 1 in its radial direction can effectively ensure the connection between the fastener 4 and the shear ring 1, making the shear ring 1 fit more stably in the groove.

[0040] Furthermore, the main shaft 5 and the retaining ring 2 are in transition fit, and the shearing ring 1 and the retaining ring 2 are in clearance fit.

[0041] The main shaft 5 and the retaining ring 2 use an intermediate fit, which ensures that the retaining ring 2 is installed in a relatively accurate position on the main shaft 5. It is neither too loose, causing the retaining ring 2 to wobble on the main shaft 5, nor too tight, making it difficult to install. The shear ring 1 and the retaining ring 2 use a clearance fit, which allows the shear ring 1 to have a certain amount of slight movement within the retaining ring 2 when subjected to the force of the fastener 4. This allows it to better perform its function of bringing the balance disc 6 against one side of the impeller 9.

[0042] Furthermore, the thickness of the retaining ring 2 in the axial direction of the main shaft 5 is greater than the thickness of the shearing ring 1 in the axial direction of the main shaft 5.

[0043] In this embodiment, the retaining ring 2 is designed to be thicker than the shear ring 1 in the axial direction. This design enhances the structural strength of the retaining ring 2, making it less prone to deformation or damage when subjected to the forces of the fixing member 3 and the fastening member 4. At the same time, the thicker retaining ring 2 also provides a more stable mounting base for the fixing member 3 and the fastening member 4, ensuring the connection reliability of the entire balance disc locking device.

[0044] Furthermore, on the side away from the impeller 9, the angle between the axis of the third hole and the axis of the main shaft 5 is an acute angle; the shear ring 1 is composed of multiple broken arc segments.

[0045] The angle between the axis of the third hole and the axis of the main shaft 5 is designed to be an acute angle. This structure ensures that when the fastener 4 applies force to the shear ring 1 through the third hole, the direction of the force is conducive to firmly fixing the shear ring 1 in the groove, thereby enhancing the connection stability between the shear ring 1 and the main shaft 5.

[0046] In addition, the shear ring 1 is designed to be composed of multiple broken arc segments. When installing and removing the shear ring 1, since it is composed of multiple arc segments, it is easier to put each arc segment into or take out of the groove in sequence.

[0047] Furthermore, the shear ring 1 is composed of 6 to 8 arc segments.

[0048] Specifically, the shear ring 1 can be composed of 6, 7, or 8 arc segments. This design ensures that the shear ring 1 fits tightly within the groove while improving the stability of the entire device.

[0049] As an optional implementation, this utility model provides a centrifugal compressor, including the balance disc locking device involved in any of the above.

[0050] In this embodiment, because the centrifugal compressor adopts the aforementioned balance disc locking device, in terms of processing, it is no longer necessary to machine high-precision fine threads on the main shaft 5, simplifying the processing flow and reducing processing difficulty and cost. In terms of disassembly and assembly, no special tools are required; operators can easily disassemble and assemble the balance disc locking device using general-purpose tools, greatly saving disassembly and assembly time and improving work efficiency. Furthermore, through the reasonable cooperation of the shear ring 1, retaining ring 2, fixing component 3, and fastening component 4, the balance disc locking device can effectively fix the balance disc 6 to the main shaft 5, ensuring the stability of the balance disc 6 during the operation of the centrifugal compressor, thereby improving the overall reliability and stability of the centrifugal compressor and extending the service life of the equipment.

[0051] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A balance disc locking device, characterized in that, Used in a centrifugal compressor, the centrifugal compressor includes a main shaft (5) and an impeller (9) and a balance disc (6) disposed on the main shaft (5). The main shaft (5) has a groove, and the balance disc locking device includes: A shear ring (1) is disposed in the groove, and the shear ring (1) is used to make the balance disk abut against one side of the impeller (9); A retaining ring (2) is disposed on the main shaft (5) and located on the outer periphery of the shear ring (1). The retaining ring (2) has multiple through first holes along the axial direction of the main shaft (5). The balance disc (6) has multiple second holes, which correspond one-to-one with the multiple first holes. The retaining ring (2) also has multiple through third holes, which extend toward the shear ring (1). Multiple fasteners (3) correspond one-to-one with multiple first holes, and the multiple fasteners (3) fix the retaining ring (2) to the balance disc (6) through the first hole and the second hole; Multiple fasteners (4) correspond one-to-one with multiple third holes. The fasteners (4) pass through the corresponding third holes and their ends abut against the shear ring (1).

2. The balance disc locking device according to claim 1, characterized in that, The shearing ring (1) is provided with a plurality of notches (101), and the plurality of notches (101) correspond one-to-one with the plurality of fasteners (4), and the end of the fastener (4) abuts against the corresponding notch (101).

3. The balance disc locking device according to claim 1, characterized in that, The first holes and the third holes are staggered on the retaining ring (2).

4. The balance disc locking device according to any one of claims 1 to 3, characterized in that, The first hole, the second hole and the third hole are all threaded holes, and the fastener (3) and the setter (4) are both screws.

5. The balance disc locking device according to claim 1, characterized in that, The width of the groove is 10mm to 13mm, and the depth of the groove is less than the thickness of the shear ring (1) in its radial direction. The width direction of the groove is the same as the axial direction of the main shaft (5), and the depth direction of the groove is perpendicular to the axial direction of the main shaft (5).

6. The balance disc locking device according to claim 1, characterized in that, The main shaft (5) is transitionally fitted with the retaining ring (2), and the shearing ring (1) is clearance fitted with the retaining ring (2).

7. The balance disc locking device according to claim 1, characterized in that, The thickness of the retaining ring (2) in the axial direction of the main shaft (5) is greater than the thickness of the shearing ring (1) in the axial direction of the main shaft (5).

8. The balance disc locking device according to claim 1, characterized in that, On the side away from the impeller (9), the angle between the axis of the third hole and the axis of the main shaft (5) is an acute angle; The shearing ring (1) is composed of multiple broken arc segments.

9. The balance disc locking device according to claim 8, characterized in that, The shearing ring (1) is composed of 6 to 8 of the aforementioned arc segments.

10. A centrifugal compressor, characterized in that, Includes the balance disc locking device as described in any one of claims 1 to 9.

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