Labyrinth type sealing structure

Abstract

The utility model relates to the technical field of compressor sealing, in particular to a labyrinth type sealing structure which comprises a rotating shaft. Two sealing seats are coaxially connected to the outer wall of the rotating shaft through keys, and a plurality of sealing protrusions are coaxially fixed to the two side walls of each sealing seat; a plurality of concentrically-arranged first comb teeth are fixed to the inner wall of one side of the second sealing cavity. Through the arrangement of the labyrinth sealing shaft sleeve and the second comb teeth, an effective axial air sealing area is formed between the second comb teeth and the rotating shaft; through the arrangement of the first comb teeth and the sealing protrusions, an effective radial air sealing area is formed between the sealing base and the first comb teeth; meanwhile, a first sealing ring is arranged in the second sealing cavity, so that the sealing effect on the sealing seat and the rotating shaft is further improved; by means of the design, multiple sealing effects can be achieved on the rotating shaft of the compressor, the sealing effect on the rotating shaft of the compressor is improved, the sealing requirement for the rotating shaft of the compressor is met, and therefore stable and safe use of the compressor is improved.

Description

Technical Field

[0001] This utility model relates to the field of compressor sealing technology, specifically a labyrinth-type sealing structure. Background Technology

[0002] Labyrinth seals, also known as comb seals, are characterized by their use of a series of sealing teeth (or sealing plates) and the gaps between them and the shaft or housing to create a labyrinth effect, thereby preventing gas leakage. They are a type of seal widely used in compressors. Currently, natural gas or oil and gas station compressors all adopt labyrinth seal structures. Through the combination of multiple sealing teeth and gaps, they form a complex labyrinth effect, which can effectively prevent gas leakage and thus ensure the safe use of natural gas or oil and gas station compressors.

[0003] Utility model patent CN202321287060.7 discloses a labyrinth sealing structure. This structure includes a main shaft, one end of which is connected to a gearbox, and the other end is connected to an impeller with a bearing mounted on it. A sealing integrated device is mounted on the main shaft between the impeller and the bearing. An air seal area is formed between the sealing integrated device near the impeller and the main shaft, and an oil seal area is formed between the sealing integrated device near the bearing and the main shaft. A pressure-reducing seal area is formed between the sealing integrated device between the air seal area and the oil seal area and the main shaft. The device features grooves on the air seal teeth and protrusions on the corresponding sealing seats. The distance between the parallel surfaces of the grooves and protrusions is less than the radial distance, thus ensuring a good sealing effect and increasing the radial displacement range of the main shaft. This effectively prevents rubbing between the air seal teeth and the sealing seats, improving the service life of the air seal teeth and the sealing effect, making it highly practical.

[0004] Although the labyrinth seal structure improves the service life and sealing effect of the air-sealing teeth, the device still has the following problems in practical use: While the device provides air sealing to the spindle through its air-sealing teeth and other structures, its sealing effect is limited, confined to axial sealing and unable to enhance the radial sealing effect. This single sealing direction restricts its sealing performance, making it difficult to meet the sealing requirements of practical applications. Therefore, we propose a labyrinth seal structure. Utility Model Content

[0005] The purpose of this invention is to provide a labyrinth-type sealing structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A labyrinth-type sealing structure includes a rotating shaft, an impeller coaxially connected to the front end of the rotating shaft, and two sealing seats coaxially connected to the outer wall of the rotating shaft. Multiple sealing protrusions are coaxially fixed on both sides of the sealing seats.

[0008] The shaft has two symmetrical semi-shells on its exterior, which are detachably connected. A protrusion is coaxially fixed to the front end of each semi-shell, and a first sealing groove is formed on the inner wall of the protrusion. A first sealing cavity is formed at the center of the inner wall of each semi-shell, and a second sealing cavity is formed at both ends of the first sealing cavity. A second sealing groove is formed on the inner wall of the second sealing cavity. Multiple first comb teeth are fixed on one side of the inner wall of each second sealing cavity, and the first comb teeth are located on the corresponding sealing protrusion side. A sealing seat is located between two adjacent second sealing cavities.

[0009] A labyrinth-type sealing bushing is provided between the two first sealing cavities, and multiple second comb teeth are coaxially fixed on the inner wall of the labyrinth-type sealing bushing.

[0010] A second sealing ring is embedded between the two first sealing grooves, and a first sealing ring is embedded between the two second sealing grooves.

[0011] As a preferred embodiment of this invention, both the second sealing ring and the first sealing ring are annular, and both are made of silicone material.

[0012] As a preferred technical solution of this utility model, two symmetrical mounting plates are fixed to the outer wall of the semi-shell. Each mounting plate is provided with a connecting hole, and a connecting bolt is inserted between two adjacent connecting holes. The end of the connecting bolt is threaded with a nut.

[0013] As a preferred technical solution of this utility model, a half flange is fixed at the rear end of the outer wall of the half shell, and a plurality of mounting holes are provided on the half flange.

[0014] As a preferred technical solution of this utility model, the center of the first comb tooth and the center of the sealing protrusion are both located on the same horizontal axis, and the first comb tooth and the sealing protrusion are staggered in the vertical plane.

[0015] As a preferred technical solution of this utility model, the sealing seat and the sealing protrusion are integrally formed structures, and both the sealing seat and the sealing protrusion are made of galvanized steel.

[0016] As a preferred technical solution of this utility model, the inner wall of the first sealing cavity is provided with a positioning groove, and the outer wall of the labyrinth-type sealing bushing is coaxially fixed with a positioning ring that is inserted and cooperates with the positioning groove.

[0017] As a preferred technical solution of this utility model, the half-shell, the protrusion and the half-flange are integrally formed structures, and the half-shell, the protrusion and the half-flange are formed by casting process.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] By using a labyrinthine sealing bushing and a second comb tooth, an effective axial air seal area is formed between the second comb tooth and the rotating shaft. By using a first comb tooth and a sealing protrusion, an effective radial air seal area is formed between the sealing seat and the first comb tooth. At the same time, the first sealing ring set in the second sealing cavity further enhances the sealing effect on the sealing seat and the rotating shaft. This design can form a multiple sealing effect on the compressor shaft, improve the sealing effect on the compressor shaft, meet the sealing requirements of the compressor shaft, and thus improve the stable and safe use of the compressor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0022] Figure 3 This is an exploded structural diagram of the semi-shell in this utility model;

[0023] Figure 4 This utility model Figure 2 Enlarged structural diagram of section A in the middle;

[0024] Figure 5 This is a side view of the structure of the semi-shell in this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the rotating shaft in this utility model;

[0026] In the picture:

[0027] 1. Rotating shaft; 10. Sealing seat; 100. Sealing protrusion;

[0028] 2. Impeller;

[0029] 3. Half-shell; 30. Half-flange; 300. Mounting hole; 31. Protrusion; 310. First sealing groove; 32. Mounting plate; 320. Connecting hole; 33. Connecting bolt; 34. Nut; 35. First sealing cavity; 350. Positioning groove; 36. Second sealing cavity; 360. Second sealing groove; 37. First comb teeth;

[0030] 4. Labyrinth seal bushing; 40. Positioning ring; 41. Second comb tooth;

[0031] 5. First sealing ring;

[0032] 6. Second sealing ring. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0034] This embodiment provides a technical solution:

[0035] Please see Figures 1-6 As shown, a labyrinth-type sealing structure includes a rotating shaft 1. An impeller 2 is coaxially keyed to the front end of the rotating shaft 1. Two sealing seats 10 are coaxially keyed to the outer wall of the rotating shaft 1. Multiple sealing protrusions 100 are coaxially fixed to both side walls of the sealing seats 10. Two symmetrical semi-shells 3 are provided outside the rotating shaft 1, and the two semi-shells 3 are detachably connected. A protrusion 31 is coaxially fixed to the front end of each semi-shell 3, and a first sealing groove 310 is formed on the inner wall of the protrusion 31. A first sealing cavity 35 is formed at the center of the inner wall of each semi-shell 3, and a second sealing cavity 36 is formed at both the front and rear ends of the first sealing cavity 35. The inner wall of the second sealing cavity 36 is provided with... A second sealing groove 360 ​​is provided; multiple concentrically arranged first comb teeth 37 are fixed on one side of the inner wall of the second sealing cavity 36, and the first comb teeth 37 are located on the corresponding side of the sealing protrusion 100; the sealing seat 10 is located between two adjacent second sealing cavities 36; a labyrinth-type sealing sleeve 4 is provided between the two first sealing cavities 35, and multiple second comb teeth 41 are coaxially fixed on the inner wall of the labyrinth-type sealing sleeve 4; a second sealing ring 6 is embedded between the two first sealing grooves 310, and the second sealing ring 6 can prevent foreign objects from entering through the gap between the protrusion 31 and the rotating shaft 1, thereby protecting the rotating shaft 1. A first sealing ring 5 is embedded between the two second sealing grooves 360.

[0036] In this embodiment, both the second sealing ring 6 and the first sealing ring 5 are annular, and both are made of silicone. The silicone material provides a better sealing effect, thus ensuring the sealing performance of the second sealing ring 6 and the first sealing ring 5 on the rotating shaft 1 and the sealing seat 10.

[0037] In this embodiment, two symmetrical mounting plates 32 are fixed to the outer wall of the semi-shell 3. Each mounting plate 32 has a connecting hole 320. A connecting bolt 33 is inserted between two adjacent connecting holes 320. A nut 34 is threaded to the end of the connecting bolt 33.

[0038] In this embodiment, a semi-flange 30 is fixed at the rear end of the outer wall of the semi-shell 3, and the semi-flange 30 has multiple mounting holes 300. The mounting holes 300 facilitate the insertion of bolts, thereby facilitating the installation and fixation of the semi-shell 3 to the compressor.

[0039] In this embodiment, the center of the first comb tooth 37 and the center of the sealing protrusion 100 are both located on the same horizontal axis, and the first comb tooth 37 and the sealing protrusion 100 are staggered in the vertical plane. This design allows the first comb tooth 37 and the sealing protrusion 100 to cooperate to form a better air seal area, further improving the sealing effect in the radial direction.

[0040] In this embodiment, the sealing seat 10 and the sealing protrusion 100 are integrally formed structures, and both the sealing seat 10 and the sealing protrusion 100 are made of galvanized steel. The integrally formed sealing seat 10 and the sealing protrusion 100 have better connection strength, ensuring the service life of the sealing seat 10 and the sealing protrusion 100. The galvanized steel material has the advantages of corrosion resistance and high strength, further improving the service life of the sealing seat 10 and the sealing protrusion 100.

[0041] In this embodiment, a positioning groove 350 is provided on the inner wall of the first sealing cavity 35, and a positioning ring 40 that is inserted into and cooperates with the positioning groove 350 is coaxially fixed on the outer wall of the labyrinth-type sealing bushing 4. The positioning groove 350 and the positioning ring 40 play a positioning role in the installation of the labyrinth-type sealing bushing 4, ensuring the stability of the labyrinth-type sealing bushing 4.

[0042] In this embodiment, the half-shell 3, the protrusion 31, and the half-flange 30 are integrally formed, and are manufactured using a casting process. This design not only achieves a seamless connection but also greatly enhances the structural integrity among the half-shell 3, the protrusion 31, and the half-flange 30, thereby ensuring higher strength and stability. Simultaneously, this design avoids the weaknesses and potential failure points that may arise from traditional connection methods, making the overall structure more robust and durable.

[0043] It should be noted that in this embodiment, the labyrinth seal bushing 4, the positioning ring 40, and the second comb tooth 41 are integrally molded structures, which enhance the overall structural strength. This design allows the labyrinth seal bushing 4, the positioning ring 40, and the second comb tooth 41 to withstand greater pressure and load, improving the durability and reliability of the sealing device. Simultaneously, this design helps reduce the possibility of gas leakage, improves the sealing effect, and thus ensures the performance and efficiency of the compressor.

[0044] In practical use, high-pressure gas enters the second sealing cavity 36 located on the rear side through the gap between the rotating shaft 1 and the half-shell 3. At this time, the high-pressure gas moves to the area between the first comb tooth 37 and the sealing protrusion 100. The high-pressure gas then passes through a series of curved channels formed between the first comb tooth 37 and the sealing protrusion 100. The gas encounters significant resistance when passing through these channels, and some of the gas is intercepted. Subsequently, another part of the gas enters the area between the labyrinth-type sealing sleeve 4 and the rotating shaft 1 through the first sealing ring 5. At this time, the gas enters the series of curved channels formed between the second comb tooth 41 and the rotating shaft 1. The gas encounters significant resistance when passing through these channels, and some of the gas is intercepted. Finally, the remaining gas enters the second sealing cavity 36 located on the front side. The high-pressure gas moves to the area between the first comb tooth 37 and the sealing protrusion 100 again. The high-pressure gas then passes through the series of curved channels formed between the first comb tooth 37 and the sealing protrusion 100 again. The gas encounters significant resistance when passing through these channels, thereby preventing gas leakage.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A labyrinth-type sealing structure, comprising a rotating shaft (1), wherein an impeller (2) is coaxially keyed to the front end of the rotating shaft (1), characterized in that: The outer wall of the rotating shaft (1) is coaxially connected to two sealing seats (10), and multiple sealing protrusions (100) are coaxially fixed on both sides of the sealing seat (10). The shaft (1) has two symmetrical half-shells (3) on its outside, and the two half-shells (3) are detachably connected; a protrusion (31) is fixed coaxially at the front end of the half-shell (3), and a first sealing groove (310) is opened on the inner wall of the protrusion (31); a first sealing cavity (35) is opened at the center of the inner wall of the half-shell (3), and a second sealing cavity (36) is opened at both the front and rear ends of the first sealing cavity (35), and a second sealing groove (360) is opened on the inner wall of the second sealing cavity (36); a plurality of first comb teeth (37) are fixed on one side of the inner wall of the second sealing cavity (36), and the first comb teeth (37) are located on the side of the corresponding sealing protrusion (100); the sealing seat (10) is located between two adjacent second sealing cavities (36). A labyrinth-type sealing bushing (4) is provided between the two first sealing cavities (35), and multiple second comb teeth (41) are coaxially fixed on the inner wall of the labyrinth-type sealing bushing (4). A second sealing ring (6) is embedded between the two first sealing grooves (310), and a first sealing ring (5) is embedded between the two second sealing grooves (360).

2. The labyrinth-type sealing structure according to claim 1, characterized in that: Both the second sealing ring (6) and the first sealing ring (5) are annular, and both the second sealing ring (6) and the first sealing ring (5) are made of silicone material.

3. The labyrinth-type sealing structure according to claim 1, characterized in that: The outer wall of the semi-shell (3) is fixed with two symmetrical mounting plates (32). Each mounting plate (32) has a connecting hole (320). A connecting bolt (33) is inserted between two adjacent connecting holes (320). A nut (34) is threaded to the end of the connecting bolt (33).

4. The labyrinth-type sealing structure according to claim 1, characterized in that: A half flange (30) is fixed at the rear end of the outer wall of the half shell (3), and a plurality of mounting holes (300) are provided on the half flange (30).

5. The labyrinth-type sealing structure according to claim 1, characterized in that: The center of the first comb tooth (37) and the center of the sealing protrusion (100) are both located on the same horizontal axis, and the first comb tooth (37) and the sealing protrusion (100) are staggered in the vertical plane.

6. The labyrinth-type sealing structure according to claim 1, characterized in that: The sealing seat (10) and the sealing protrusion (100) are integrally formed structures, and both the sealing seat (10) and the sealing protrusion (100) are made of galvanized steel.

7. The labyrinth-type sealing structure according to claim 1, characterized in that: The inner wall of the first sealing cavity (35) is provided with a positioning groove (350), and the outer wall of the labyrinth-type sealing bushing (4) is coaxially fixed with a positioning ring (40) that is inserted into and cooperates with the positioning groove (350).

8. The labyrinth-type sealing structure according to claim 1, characterized in that: The half-shell (3), the protrusion (31) and the half-flange (30) are integrally formed structures, and the half-shell (3), the protrusion (31) and the half-flange (30) are formed by casting process.

Images