Wear-resistant shaft sleeve for sealing shaft end of screw vacuum pump

Abstract

The utility model relates to the technical field of shaft sleeves, in particular to a wear-resistant shaft sleeve for sealing a shaft end of a screw vacuum pump, which comprises a wear-resistant shaft sleeve body, a positioning convex ring is fixedly connected to the lower part of the outer surface of the wear-resistant shaft sleeve body, and six through holes are formed in the outer surface of the positioning convex ring in an annular array manner. Six first limiting clamping grooves and six second limiting clamping grooves are formed in the inner wall of the abrasion-resistant shaft sleeve body. According to the wear-resistant shaft sleeve for sealing the shaft end of the screw vacuum pump, accurate positioning and installation are achieved through the positioning convex ring and the through hole, sealing and wear resistance are enhanced through cooperation of the first limiting clamping groove, the second limiting clamping groove and the sealing assembly, and rapid disassembly and assembly and stable connection are achieved through the wear-resistant fastening gland assembly; the problems that a traditional shaft sleeve is poor in abrasion resistance and complex in installation and maintenance are effectively solved, screw vacuum pump shaft end sealing reliability and equipment operation efficiency are improved, and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of bushing technology, and in particular to a wear-resistant bushing for sealing the shaft end of a screw vacuum pump. Background Technology

[0002] Screw vacuum pumps are widely used in industries such as chemical and pharmaceutical manufacturing. The performance of the shaft end seal is crucial to the stable operation of the equipment. Currently, with increasing production requirements, higher standards are being set for the wear resistance and sealing performance of the shaft end seal. However, existing wear-resistant shaft sleeves have two shortcomings: first, traditional sealing structures have poor wear resistance and are prone to wear under long-term operation, leading to seal failure and shortening the service life of the equipment; second, installation and maintenance are inconvenient, with low precision between components, complex installation process, and difficulty in disassembly and repair when a fault occurs, affecting production efficiency and increasing maintenance costs. Therefore, there is an urgent need for a high-performance wear-resistant shaft sleeve to improve the current situation. Utility Model Content

[0003] The main objective of this invention is to provide a wear-resistant bushing for sealing the shaft end of a screw vacuum pump, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A wear-resistant bushing for sealing the shaft end of a screw vacuum pump includes a wear-resistant bushing body. A positioning protrusion is fixedly connected to the lower part of the outer surface of the wear-resistant bushing body. The outer surface of the positioning protrusion has six through holes arranged in a ring array. The inner wall of the wear-resistant bushing body has six first limiting grooves and six second limiting grooves, which are alternately staggered. A sealing assembly is provided on the inner wall of the wear-resistant bushing body. A wear-resistant fastening cap assembly is provided on the top of the wear-resistant bushing body.

[0006] Preferably, the sealing assembly includes an inner sealing ring and an outer sealing ring. The upper part of the inner wall of the inner sealing ring is provided with six inner positioning grooves. Six inner locking blocks are fixedly connected to the outer surface of the inner sealing ring. Six outer locking blocks are fixedly connected to the outer surface of the outer sealing ring. The upper end of each of the six outer locking blocks is provided with a threaded connection hole.

[0007] Preferably, the six inner positioning slots are alternately staggered with the six inner locking blocks.

[0008] Preferably, the six outer locking blocks are respectively inserted into the six inner positioning grooves, and the outer sealing ring is located inside the inner sealing ring.

[0009] Preferably, the six inner card blocks are alternately staggered with the six outer card blocks, and the positions of the six inner card blocks and the six outer card blocks correspond to the positions of the six first limiting card slots and the six second limiting card slots, respectively, and their dimensions match.

[0010] Preferably, the outer sealing ring is engaged with the wear-resistant bushing body through six outer locking blocks and six second limiting slots, and the inner sealing ring is engaged with the wear-resistant bushing body through six inner locking blocks and six first limiting slots.

[0011] Preferably, the wear-resistant fastening cap assembly includes a cap body, a sealing ring is fixedly connected to the upper part of the inner wall of the cap body, an outer ring is fixedly connected to the upper part of the outer surface of the cap body, and six fastening bolts are movably connected to the upper end of the cap body in a ring-shaped array of threads.

[0012] Preferably, the wear-resistant fastening gland assembly is sleeved on the outer surface of the wear-resistant bushing body, the sealing pressure ring is inserted into the inner wall of the outer sealing ring, and the gland body is detachably connected to six outer clamping blocks through six fastening bolts and six threaded connection holes.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model adopts a double-layer nested structure. The inner sealing ring and the outer sealing ring are interlocked through an inner positioning groove and an outer locking block to form a three-dimensional interlaced sealing barrier, which significantly improves the sealing performance. The inner and outer locking blocks are precisely engaged with the limiting grooves on the inner wall of the wear-resistant bushing body, which not only enhances the stability of the sealing assembly installation, but also effectively disperses the wear stress during the working process and avoids excessive local wear. The alternating staggered distribution design makes the contact between the sealing layers tighter and can adapt to pressure changes under different working conditions. This structural design effectively extends the service life of the sealing components, reduces the risk of media leakage, ensures the long-term stable operation of the screw vacuum pump under complex working conditions, and reduces the frequency and cost of equipment maintenance.

[0015] 2. In this utility model, the sealing ring on the main body of the gland is tightly inserted into the inner wall of the outer sealing ring, which can further enhance the sealing effect and prevent media leakage. The outer ring provides structural support and improves overall stability. The six fastening bolts cooperate with the threaded connection holes on the outer clamping block to achieve quick disassembly and assembly, simplify the installation process, and reduce the installation difficulty. When the equipment malfunctions, the gland assembly can be separated simply by unscrewing the bolts, which is convenient for inspection and replacement of parts, greatly shortens downtime, and reduces maintenance costs. At the same time, the standardized connection method also improves the fitting accuracy between components and ensures the reliable operation of the screw vacuum pump shaft end sealing system. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of a wear-resistant bushing for sealing the shaft end of a screw vacuum pump according to the present invention.

[0017] Figure 2 This is a schematic diagram of the inside and outside of the wear-resistant bushing body of a wear-resistant bushing for sealing the shaft end of a screw vacuum pump according to the present invention.

[0018] Figure 3 This is a schematic diagram of the overall structure of a sealing assembly for a wear-resistant bushing used for sealing the shaft end of a screw vacuum pump, according to the present invention.

[0019] Figure 4 This is a schematic diagram of the overall structure of a wear-resistant fastening gland assembly for a wear-resistant bushing used for sealing the shaft end of a screw vacuum pump, according to the present invention.

[0020] In the figure: 1. Wear-resistant bushing body; 2. Positioning convex ring; 3. Through hole; 4. First limiting groove; 5. Second limiting groove; 6. Sealing assembly; 61. Inner sealing ring; 62. Inner positioning groove; 63. Inner locking block; 64. Outer sealing ring; 65. Outer locking block; 66. Threaded connection hole; 7. Wear-resistant fastening gland assembly; 71. Gland body; 72. Sealing pressure ring; 73. Fastening bolt; 74. Outer ring. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please see Figure 1-4 This utility model provides a technical solution:

[0025] A wear-resistant bushing for sealing the shaft end of a screw vacuum pump includes a wear-resistant bushing body 1. A positioning protrusion ring 2 is fixedly connected to the lower part of the outer surface of the wear-resistant bushing body 1. The outer surface of the positioning protrusion ring 2 has six through holes 3 arranged in a ring array. The inner wall of the wear-resistant bushing body 1 has six first limiting grooves 4 and six second limiting grooves 5 respectively. The six first limiting grooves 4 and the six second limiting grooves 5 are alternately staggered. A sealing assembly 6 is provided on the inner wall of the wear-resistant bushing body 1. A wear-resistant fastening gland assembly 7 is provided on the top of the wear-resistant bushing body 1.

[0026] In this embodiment, the sealing assembly 6 includes an inner sealing ring 61 and an outer sealing ring 64. The upper part of the inner wall of the inner sealing ring 61 has six inner positioning grooves 62. Six inner locking blocks 63 are fixedly connected to the outer surface of the inner sealing ring 61. Six outer locking blocks 65 are fixedly connected to the outer surface of the outer sealing ring 64. Each of the six outer locking blocks 65 has a threaded connection hole 66 at its upper end. The six inner positioning grooves 62 and the six inner locking blocks 63 are alternately staggered. The six outer locking blocks 65 are respectively inserted into the six inner positioning grooves 62. The outer sealing ring 64 is located inside the inner sealing ring 61. The six inner locking blocks 63 are alternately staggered with the six outer locking blocks 65. The positions of the six inner locking blocks 63 and the six outer locking blocks 65 correspond to the positions of the six first limiting slots 4 and the six second limiting slots 5, and their dimensions match. The outer sealing ring 64 is engaged with the wear-resistant bushing body 1 through the six outer locking blocks 65 and the six second limiting slots 5, and the inner sealing ring 61 is engaged with the wear-resistant bushing body 1 through the six inner locking blocks 63 and the six first limiting slots 4.

[0027] Through the above scheme, the inner sealing ring 61 and the outer sealing ring 64 form a multi-layer protection through the staggered cooperation of the inner positioning groove 62, the inner locking block 63, and the outer locking block 65. The inner locking block 63 and the outer locking block 65 respectively engage with the first limiting groove 4 and the second limiting groove 5 on the inner wall of the wear-resistant bushing body 1, which enhances the connection stability. During operation, the multi-layer sealing structure distributes the wear pressure and avoids excessive wear in a single part. Even if local wear occurs, other layers can still maintain the sealing effect. This design extends the overall service life, reduces equipment failure caused by seal failure, and ensures the long-term stable operation of the screw vacuum pump.

[0028] In this embodiment, the wear-resistant fastening cap assembly 7 includes a cap body 71. A sealing ring 72 is fixedly connected to the upper part of the inner wall of the cap body 71. An outer ring 74 is fixedly connected to the upper part of the outer surface of the cap body 71. Six fastening bolts 73 are movably connected to the upper end of the cap body 71 in a ring-shaped array. The wear-resistant fastening cap assembly 7 is sleeved with the outer surface of the wear-resistant bushing body 1. The sealing ring 72 is inserted into the inner wall of the outer sealing ring 64. The cap body 71 is detachably connected to six outer clamping blocks 65 through six fastening bolts 73 and six threaded connection holes 66.

[0029] With the above solution: during installation, the gland body 71 is fitted onto the outer surface of the wear-resistant bushing body 1, and the sealing ring 72 is precisely inserted into the inner wall of the outer sealing ring 64. The outer ring 74 provides structural support, and six fastening bolts 73 pass through the gland body 71 and are screwed into the threaded connection holes 66 on the outer locking block 65 of the outer sealing ring 64 to form a standardized assembly process. During disassembly, only the fastening bolts 73 need to be unscrewed to separate the gland body 71 from the sealing assembly 6, without complicated operations. This design significantly improves the component fitting accuracy, simplifies the installation process, reduces maintenance difficulty, shortens downtime, effectively improves production efficiency, and reduces maintenance costs.

[0030] It should be noted that this utility model is a wear-resistant bushing for sealing the shaft end of a screw vacuum pump. During use, firstly, the positioning convex ring 2 achieves initial positioning and installation with the screw vacuum pump through the through hole 3, laying the foundation for the overall structure. In the sealing assembly 6, the inner locking block 63 of the inner sealing ring 61 engages with the first limiting groove 4 of the wear-resistant bushing body 1, and the outer locking block 65 of the outer sealing ring 64 engages with the second limiting groove 5. Furthermore, the inner positioning groove 62 and the outer locking block 65 interlock, forming a multi-layer sealing structure that effectively prevents media leakage and distributes wear, providing a wear-resistant and tight seal. The pressure cap body 71 of the pressure cap assembly 7 is sleeved on the outside of the wear-resistant bushing body 1. The sealing pressure ring 72 is inserted into the inner wall of the outer sealing ring 64 and tightened and fixed by the fastening bolt 73 and the threaded connection hole 66 on the outer clamping block 65, thereby enhancing the sealing stability. In summary, this wear-resistant bushing achieves convenient installation, efficient sealing and durable wear resistance through the precise cooperation of each component. It not only solves the problems of easy wear and complicated installation and maintenance of traditional sealing structures, but also extends the service life of the equipment, reduces maintenance costs, and significantly improves the reliability and practicality of the screw vacuum pump shaft end seal.

[0031] 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 illustrative of the principles of this 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 claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A wear sleeve for shaft end sealing of a screw vacuum pump, comprising a wear sleeve body (1), characterized in that: The lower part of the outer surface of the wear-resistant bushing body (1) is fixedly connected to a positioning protrusion ring (2). The outer surface of the positioning protrusion ring (2) is provided with six through holes (3) in a ring array. The inner wall of the wear-resistant bushing body (1) is provided with six first limiting slots (4) and six second limiting slots (5). The six first limiting slots (4) and the six second limiting slots (5) are alternately staggered. The inner wall of the wear-resistant bushing body (1) is provided with a sealing assembly (6). The upper part of the wear-resistant bushing body (1) is provided with a wear-resistant fastening cap assembly (7). The sealing assembly (6) includes an inner sealing ring (61) and an outer sealing ring (64). The inner sealing ring (61) has six inner positioning grooves (62) on its upper inner wall. The outer surface of the inner sealing ring (61) is fixedly connected to six inner locking blocks (63). The outer surface of the outer sealing ring (64) is fixedly connected to six outer locking blocks (65). The upper end of each of the six outer locking blocks (65) is provided with a threaded connection hole (66).

2. A wear sleeve for shaft end sealing of a screw vacuum pump according to claim 1, characterized in that: The six inner positioning slots (62) are alternately staggered with the six inner locking blocks (63).

3. A wear sleeve for shaft end sealing of a screw vacuum pump according to claim 1, characterized in that: The six outer card blocks (65) are respectively inserted into the six inner positioning grooves (62), and the outer sealing ring (64) is located inside the inner sealing ring (61).

4. A wear sleeve for shaft end sealing of a screw vacuum pump according to claim 1, characterized in that: The six inner card blocks (63) are alternately staggered with the six outer card blocks (65). The positions of the six inner card blocks (63) and the six outer card blocks (65) correspond to the positions of the six first limiting slots (4) and the six second limiting slots (5) and their dimensions match.

5. A wear sleeve for shaft end sealing of a screw vacuum pump according to claim 1, characterized in that: The outer sealing ring (64) is engaged with the wear-resistant bushing body (1) through six outer locking blocks (65) and six second limiting slots (5), and the inner sealing ring (61) is engaged with the wear-resistant bushing body (1) through six inner locking blocks (63) and six first limiting slots (4).

6. A wear sleeve for shaft end sealing of a screw vacuum pump according to claim 1, characterized in that: The wear-resistant fastening cap assembly (7) includes a cap body (71), a sealing ring (72) is fixedly connected to the upper part of the inner wall of the cap body (71), an outer ring (74) is fixedly connected to the upper part of the outer surface of the cap body (71), and six fastening bolts (73) are movably connected to the upper end of the cap body (71) in a ring array.

7. A wear sleeve for shaft end sealing of a screw vacuum pump according to claim 6, characterized in that: The wear-resistant fastening gland assembly (7) is sleeved on the outer surface of the wear-resistant bushing body (1), the sealing pressure ring (72) is inserted into the inner wall of the outer sealing ring (64), and the gland body (71) is detachably connected to six outer clamping blocks (65) through six fastening bolts (73) and six threaded connection holes (66).

Images