Labyrinth sealing element for screw compressor

Abstract

A groove is formed in an outer cylinder body, an inner cylinder body is inserted into the groove, positioning protruding strips on the periphery of the inner cylinder body correspond to positioning grooves of the groove in a one-to-one mode and are connected with the positioning grooves in an inserted mode, a pressing ring is pressed at the outer end of the inner cylinder body, and an oil inlet channel is formed in the inner cylinder body in the axial direction. A plurality of oil inlet holes are formed in the inner barrel in the radial direction, the oil inlet holes correspond to the annular grooves one to one and are communicated with the annular grooves, the end, close to the pressing ring, of the oil inlet channel is communicated with the outside and provided with a flaring, and a protruding column is arranged on the surface of the inner side of the pressing ring and connected with the flaring in an inserted mode. According to the invention, only the inner cylinder body needs to be replaced, the use cost is reduced, the inner cylinder body has good stability, meanwhile, the oil inlet channel of the inner cylinder body is blocked through the convex column of the pressing ring, and compared with a traditional mode of laterally forming the oil inlet channel, a blocking structure does not need to be additionally arranged for blocking the oil inlet channel.

Description

Technical Field

[0001] This utility model relates to the field of shaft sealing technology, specifically a labyrinth seal for a screw compressor. Background Technology

[0002] A labyrinth seal is a seal that reduces leakage by having many tortuous chambers between rotating and stationary parts. It consists of several sequentially arranged annular sealing teeth around a rotating shaft, with the teeth forming a series of flow-blocking gaps and expansion cavities. The sealed medium experiences a throttling effect as it passes through the gaps in the labyrinth, thus preventing leakage.

[0003] Currently, screw compressor shafts are typically sealed with labyrinth seals. However, existing labyrinth seals are generally one-piece structures, requiring replacement of the entire seal when it wears out, which increases operating costs. Furthermore, the lubricating oil inlet channels of existing labyrinth seals are generally radially oriented, necessitating separate sealing components to plug the oil passages. Therefore, an improved technology is urgently needed to address this problem in the existing technology. Utility Model Content

[0004] The purpose of this invention is to provide a labyrinth seal for screw compressors to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a labyrinth seal for a screw compressor, comprising an outer cylinder, an inner cylinder, and a pressure ring. The outer cylinder has a groove inside, and several positioning grooves are formed on the inner wall of the groove. Several positioning protrusions are formed on the outer surface of the inner cylinder along the axial direction. The inner cylinder is inserted into the groove, and the positioning protrusions correspond one-to-one with the positioning grooves and are interlocked. The pressure ring is pressed against the outer end of the inner cylinder and fastened to the outer cylinder with bolts. Several annular grooves are formed on the inner wall of the inner cylinder. An oil inlet channel is formed axially inside the inner cylinder. Several oil inlet holes are formed radially inside the inner cylinder. The oil inlet holes correspond one-to-one with the annular grooves and are interconnected. The oil inlet holes are also interconnected with the oil inlet channel. The oil inlet channel, near the pressure ring, is interconnected with the outside and has a flared opening. A protrusion is formed on the inner surface of the pressure ring, and the protrusion is interlocked with the flared opening.

[0006] Preferably, the labyrinth seal for a screw compressor provided by this utility model has a flange at one end of the outer cylinder.

[0007] Preferably, the present invention provides a labyrinth seal for a screw compressor, wherein the outer cylinder is provided with a boss at the groove and at the end away from the flange, and the inner cylinder is supported on the inner surface of the boss at the end away from the pressure ring.

[0008] Preferably, the present invention provides a labyrinth seal for a screw compressor, wherein the outer cylinder has a pressure ring mounting groove at the end of the groove away from the boss, the pressure ring is disposed in the pressure ring mounting groove, and the thickness of the pressure ring does not exceed the width of the pressure ring mounting groove.

[0009] Preferably, the present invention provides a labyrinth seal for a screw compressor, wherein the pressure ring has a plurality of countersunk holes, the outer cylinder has a plurality of screw holes located at the pressure ring mounting groove, and the bolt passes through the countersunk holes and is fastened to the corresponding screw holes.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The outer cylinder contains an inner cylinder. When the inner cylinder and shaft wear out and need to be replaced, only the inner cylinder needs to be replaced, reducing operating costs. The outer periphery of the inner cylinder is fitted with the positioning groove of the outer cylinder through a raised strip, thereby ensuring the stability of the inner cylinder. At the same time, the inner cylinder has an oil inlet channel and an oil inlet hole. The flared end of the oil inlet channel is sealed by the protrusion of the pressure ring. Compared with the traditional method of opening the oil inlet channel on the side, there is no need to set up a separate sealing structure to seal the oil inlet channel. Furthermore, the insertion of the protrusion and the flared end further improves the stability of the inner cylinder. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 For the appendix Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0014] Figure 3 This is a schematic diagram of the cross-sectional structure of the outer cylinder;

[0015] Figure 4 This is a schematic diagram of the outer cylinder structure from the front view.

[0016] Figure 5 This is a schematic diagram of the cross-sectional structure of the inner cylinder;

[0017] Figure 6 This is a schematic diagram of the inner cylinder structure from the front view.

[0018] Figure 7 This is a schematic diagram of the cross-sectional structure of the pressure ring;

[0019] Figure 8 This is a schematic diagram of the front view of the pressure ring structure.

[0020] In the diagram: 1. Outer cylinder; 2. Inner cylinder; 3. Pressure ring; 4. Groove; 5. Positioning groove; 6. Positioning protrusion; 7. Bolt; 8. Annular groove; 9. Oil inlet channel; 10. Oil inlet hole; 11. Flange; 12. Protrusion; 13. Flange; 14. Boss; 15. Pressure ring mounting groove; 16. Countersunk hole; 17. Screw hole. Detailed Implementation

[0021] The technical solution of this 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 this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that in the description of this utility model, the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Please see Figure 1This utility model provides a technical solution: a labyrinth seal for a screw compressor, comprising an outer cylinder 1, an inner cylinder 2, and a pressure ring 3. One end of the outer cylinder 1 is provided with a flange 13, which connects to the compressor housing to ensure the stability of the entire labyrinth seal. A groove 4 is formed inside the outer cylinder 1, and several positioning grooves 5 are formed on the inner wall of the groove 4. Several positioning protrusions 6 are formed on the outer surface of the inner cylinder 2 along the axial direction. The inner cylinder 2 is inserted into the groove 4, and the positioning protrusions 6 correspond one-to-one with the positioning grooves 5 and are interlocked. A boss 14 is provided at the end of the outer cylinder 1 located in the groove 4 away from the flange 13. The end of the inner cylinder 2 away from the pressure ring 3 is supported on the inner surface of the boss 14, ensuring that the inner cylinder 2 does not detach from the outer cylinder 1. The pressure ring 3 is pressed against the outer end of the inner cylinder 2 and fastened to the outer cylinder 1 by bolts 7. A pressure ring mounting groove is formed at the end of the outer cylinder 1 located in the groove 4 away from the boss 14. 15. The pressure ring 3 is set in the pressure ring mounting groove 15. The pressure ring 3 is installed through the pressure ring mounting groove 15. The thickness of the pressure ring 3 does not exceed the width of the pressure ring mounting groove 15 to ensure that the pressure ring 3 does not affect the overall installation. The pressure ring 3 has several countersunk holes 16. The outer cylinder 1 has several screw holes 17 located at the pressure ring mounting groove 15. The bolt 7 passes through the countersunk holes 16 and is fastened to the corresponding screw holes 17. This structure enables the bolt 7 to fasten the pressure ring 3 to the pressure ring. Inside the mounting groove 15, the inner wall of the inner cylinder 2 is provided with several annular grooves 8. An oil inlet channel 9 is provided axially inside the inner cylinder 2. An oil inlet hole 10 is provided radially inside the inner cylinder 2. The oil inlet hole 10 corresponds to the annular groove 8 and is interconnected with each other. The oil inlet hole 10 is also interconnected with the oil inlet channel 9. The end of the oil inlet channel 9 near the pressure ring 3 is interconnected with the outside and is provided with a flared opening 11. A protruding post 12 is provided on the inner surface of the pressure ring 3. The protruding post 12 is inserted into the flared opening 11.

[0024] Assembly method and operating principle: Insert the inner cylinder 2, which has several annular grooves 8 on its inner wall, into the groove 4 of the outer cylinder 1, and insert the positioning protrusion 6 on the outer wall of the inner cylinder 2 into the positioning groove 5 around the groove 4. Then, put the outer cylinder 1 and the inner cylinder 2 onto the compressor shaft, and inject lubricating oil through the flared end 11. The lubricating oil enters each annular groove 8 through the oil inlet channel 9 and the oil inlet hole 10. Next, put the pressure ring 3 onto the compressor shaft, and then place the pressure ring 3 into the pressure ring mounting groove 15, and insert the protrusion 12 into the flared end 11 of the inner cylinder 2. At this time, the countersunk hole 16 of the pressure ring 3 corresponds one-to-one with the screw hole 17 at the pressure ring mounting groove 15. Finally, pass the bolt 7 through the countersunk hole 16 of the pressure ring 3 and tighten it with the corresponding screw hole 17 to complete the assembly. This utility model has a reasonable structure. The outer cylinder 1 is provided with an inner cylinder 2. When the inner cylinder 2 and the shaft are worn and need to be replaced, only the inner cylinder 2 needs to be replaced, which reduces the cost of use. The outer periphery of the inner cylinder 2 cooperates with the positioning groove 5 of the outer cylinder 1 through the protrusion strip, thereby ensuring the stability of the inner cylinder 2. At the same time, the inner cylinder 2 is provided with an oil inlet channel 9 and an oil inlet hole 10. The flared opening 11 of the oil inlet channel 9 is sealed by the protrusion 12 of the pressure ring 3. Compared with the traditional method of opening the oil inlet channel 9 laterally, there is no need to set up a separate sealing structure to seal the oil inlet channel 9. At the same time, the insertion of the protrusion 12 and the flared opening 11 further improves the stability of the inner cylinder 2.

[0025] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0026] 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 the embodiments, those skilled in the art should understand that modifications and 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 labyrinth seal for a screw compressor, characterized by: The system includes an outer cylinder (1), an inner cylinder (2), and a pressure ring (3). The outer cylinder (1) has a groove (4) inside, and several positioning grooves (5) are formed on the inner wall of the outer cylinder (1) within the groove (4). Several positioning protrusions (6) are axially arranged on the outer surface of the inner cylinder (2). The inner cylinder (2) is inserted into the groove (4), and the positioning protrusions (6) correspond one-to-one with the positioning grooves (5) and are interlocked. The pressure ring (3) is pressed against the outer end of the inner cylinder (2) and fastened to the outer cylinder (1) by bolts (7). The inner wall is provided with several annular grooves (8), and the inner cylinder (2) is provided with an oil inlet channel (9) along the axial direction. The inner cylinder (2) is provided with several oil inlet holes (10) along the radial direction. The oil inlet holes (10) correspond one-to-one with the annular grooves (8) and are interconnected. The oil inlet holes (10) are also interconnected with the oil inlet channel (9). The oil inlet channel (9) is connected to the outside near the pressure ring (3) and is provided with a flared opening (11). The inner surface of the pressure ring (3) is provided with a protruding post (12), and the protruding post (12) is inserted into the flared opening (11).

2. A labyrinth seal for a screw compressor according to claim 1, characterized in that: A flange (13) is provided at one end of the outer cylinder (1).

3. A labyrinth seal for a screw compressor according to claim 1, characterized in that: The outer cylinder (1) is located in the groove (4) and has a boss (14) at the end away from the flange (13). The inner cylinder (2) is supported on the inner surface of the boss (14) at the end away from the pressure ring (3).

4. A labyrinth seal for a screw compressor according to claim 1, characterized in that: The outer cylinder (1) has a pressure ring mounting groove (15) at the end of the groove (4) away from the boss (14). The pressure ring (3) is set in the pressure ring mounting groove (15), and the thickness of the pressure ring (3) does not exceed the width of the pressure ring mounting groove (15).

5. A labyrinth seal for a screw compressor according to claim 1, characterized in that: The pressure ring (3) has several countersunk holes (16), and the outer cylinder (1) has several screw holes (17) located at the pressure ring mounting groove (15). The bolt (7) passes through the countersunk holes (16) and is fastened to the corresponding screw holes (17).

Images