Long circular shaft with flexible vibration isolation structure

Abstract

This invention discloses a long cylindrical shaft with a flexible vibration isolation structure, solving the problem of mutual interference between the front and rear support bearings in existing long cylindrical shaft structures, which affects the rotation of the long cylindrical shaft. The technical solution includes a long cylindrical shaft and a long shaft tube fitted outside the long cylindrical shaft. Front and rear supports are respectively provided at both ends of the annular gap between the long cylindrical shaft and the long shaft tube. The middle section of the annular gap is a cooling water pipe. The long shaft tube consists of a front shaft tube and a rear shaft tube, which are sealed and connected by a flexible vibration isolation sealing flange and a compensation sealing flange. This invention has an extremely simple structure, good sealing efficiency, low cost, effectively reduces mutual interference between front and rear vibrations, and has dimensional compensation functions in both the length and diameter directions.

Description

Technical Field

[0001] This invention relates to shaft structures in the field of machinery, specifically a long round shaft with a flexible vibration isolation structure. Background Technology

[0002] Currently, in certain specialized equipment, the long cylindrical shaft requires cooling during high-speed rotation. Therefore, a shaft tube is fitted over the entire shaft to seal the cooling water. Due to its considerable length, support bearings are installed at both the front and rear ends of the long cylindrical shaft to ensure accuracy. The outer surfaces of these support bearings are connected to the inner bore of the shaft tube. When the long cylindrical shaft rotates, the front and rear support bearings vibrate. Since these bearings are connected to the inner bore of the shaft tube, their vibrations are transmitted to the shaft tube, causing mutual interference and affecting the rotation of the long cylindrical shaft.

[0003] To avoid the mutual interference of front and rear vibrations of a long cylindrical shaft under such sealing conditions, the common method is to optimize the selection of materials for the support bearing. Some special materials can effectively reduce the mutual interference of front and rear vibrations, but they are expensive and generally unaffordable for most companies. Therefore, a long cylindrical shaft with vibration isolation effect that is low in cost, can effectively reduce the mutual interference of front and rear vibrations, and meets the sealing conditions has been developed. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a long circular shaft with a flexible vibration isolation structure that has an extremely simple structure, good sealing efficiency, low cost, can effectively reduce the mutual interference of front and rear vibrations, and has dimensional compensation functions in the length and diameter directions.

[0005] The technical solution features a long cylindrical shaft with a flexible vibration isolation structure, including a long cylindrical shaft and a long shaft tube fitted outside the long cylindrical shaft. The two ends of the annular gap between the long cylindrical shaft and the long shaft tube are respectively provided with front and rear supports. The middle section of the annular gap is a cooling water pipeline. The long shaft tube is composed of a front shaft tube and a rear shaft tube, and the front shaft tube and the rear shaft tube are sealed and connected by a flexible vibration isolation sealing flange and a compensation sealing flange.

[0006] The flexible vibration isolation sealing flange consists of a first connecting flange, an intermediate rubber layer, and a second connecting flange that are vulcanized into one piece.

[0007] The connection between the first and second connecting flanges and the intermediate rubber layer is a toothed meshing part.

[0008] The intermediate rubber layer has a T-shaped cross-section, with internal teeth on the bottom surfaces of both sides of the T-shaped head, and external teeth that mesh with the external teeth on the top surfaces of the first and second connecting flanges facing the intermediate rubber layer.

[0009] The first connecting flange is bolted to the front axle tube, and the second connecting flange is bolted to the compensating sealing flange.

[0010] A first sealing ring is provided between the first connecting flange and the front axle tube, and a second sealing ring is provided between the second connecting flange and the compensating sealing flange.

[0011] The compensating sealing flange consists of a front extension section and a rear connecting section, and the rear connecting section is bolted to the rear axle tube.

[0012] A third sealing ring is provided between the compensating sealing flange and the rear axle tube.

[0013] To address the problems in the background technology, the inventors have broken down the traditional single shaft tube into a front shaft tube and a rear shaft tube. A flexible vibration-damping sealing flange and a compensating sealing flange are installed between the front and rear shaft tubes. Utilizing the elastic characteristics of the intermediate rubber layer in the flexible vibration-damping sealing flange, tension or compression in the length direction is achieved, and short-distance deviations in the length direction between the front and rear shaft tubes can also be compensated. Furthermore, based on the elastic characteristics of the rubber layer, it can also compensate for torsion in the diameter direction to a certain extent. Further, preferably, the intermediate rubber section has a T-shaped structure, and the connection between the intermediate rubber and the flanges on both sides is a toothed meshing part. This not only increases the bonding area during vulcanization and enhances the connection force, but also allows the inner teeth on the bottom surface of both sides of the T-shaped head to mesh internally and externally with the outer teeth on the top surface of the first and second connecting flanges facing the intermediate rubber. Compared to a front-and-rear meshing structure, this structure maximizes the torsion compensation performance and significantly extends the service life of the equipment.

[0014] When the gap between the current shaft tube and the rear shaft tube and the length of the flexible vibration isolation sealing flange is too large to be compensated by rubber elasticity, a compensation connecting flange is added. It consists of an extension section at the front and a connecting section at the rear. By selecting compensation connecting flanges with extension sections of different sizes, the purpose of compensation over a large distance can be achieved.

[0015] This invention features a simple structure and effective sealing connections between components. It utilizes the elastic properties of rubber to achieve vibration isolation, sealing, and compensation for a certain distance in the length and diameter directions of the shaft tube. This avoids mutual interference between the vibrations of the front and rear support bearings, minimizes the impact on the rotation of the long cylindrical shaft, ensures cooling effect, improves equipment lifespan, reduces maintenance costs, and extends maintenance cycles. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 A schematic diagram of the flexible vibration isolation sealing flange.

[0018] Figure 3 A schematic diagram of the compensating sealing flange.

[0019] Among them, 1-long round shaft; 2-front support; 3-cooling water pipeline; 4-front axle tube; 5-flexible vibration isolation sealing flange; 5.1-first connecting flange; 5.2-intermediate rubber layer; 5.3-second connecting flange; 6-compensating connecting flange; 6.1-extension section; 6.2-connecting section; 7-rear axle tube; 8-rear support; 9-first sealing ring; 10-second sealing ring; 11-third sealing ring; 12-internal toothed part; 13-external toothed part; 14-bolt. Detailed Implementation

[0020] The present invention will be further explained below with reference to the accompanying drawings:

[0021] See Figures 1-3 The present invention includes a long cylindrical shaft 1 and a long shaft tube fitted outside the long cylindrical shaft 1, wherein the long shaft tube is composed of a front shaft tube 4 and a rear shaft tube 7;

[0022] The annular gap between the long cylindrical shaft 1 and the long shaft tube is provided with front and rear supports 2 and 8 at both ends, respectively. The middle section of the annular gap is a cooling water pipe 3. The front shaft tube 4 and the rear shaft tube 7 are sealed and connected by a flexible vibration isolation sealing flange 5 and a compensation sealing flange 6.

[0023] The flexible vibration isolation sealing flange 5 consists of a first connecting flange 5.1, an intermediate rubber layer 5.2, and a second connecting flange 5.3, all vulcanized together.

[0024] Preferably, the connection between the first connecting flange 5.1, the second connecting flange 5.3, and the intermediate rubber layer 5.2 is a toothed meshing part. Specifically, the intermediate rubber layer has a T-shaped cross-section, with internal teeth 12 on the bottom surfaces of both sides of the T-shaped head, and external teeth 13 on the top surface of the first connecting flange 5.1 and the second connecting flange 5.3 facing the intermediate rubber layer 5.2, which mesh with the external teeth 12. The external teeth 12 and the internal teeth 13 mesh together to form a toothed meshing part.

[0025] The first connecting flange 5.1 is connected to the front axle tube 4 by bolts 14 and is equipped with a first sealing ring. The second connecting flange 5.3 is connected to the compensating sealing flange 6 by bolts 14. Considering the sealing issue, the compensating sealing flange 6 is provided with stepped bolt holes, allowing the bolts 14 to be recessed into the holes to avoid affecting the sealing connection between the compensating sealing flange 6 and the rear axle tube 7. The compensating sealing flange 6 consists of a front extension section 6.1 and a rear connecting section 6.2, which is connected to the rear axle tube 7 by bolts 14. After the bolt connection is completed, it is locked with a gasket and nut; this is prior art and will not be described in detail. If necessary, the flexible vibration isolation sealing flange 5 and the compensating sealing flange 6 can also be provided with threaded holes for hoisting.

[0026] A first sealing ring 9 is provided between the first connecting flange 5.1 and the front axle tube, a second sealing ring 10 is provided between the second connecting flange 5.3 and the compensating sealing flange 6, and a third sealing ring 11 is provided between the compensating sealing flange 6 and the rear axle tube 7. The above sealing rings can be set in the pre-opened sealing groove, and the specific position can be reasonably set according to the needs to meet the requirements of sealing connection.

[0027] When cooling water is introduced into the cooling water pipe 3, and the long cylindrical shaft 1 is driven to rotate by external power, the vibration generated at the contact point between the left side of the long cylindrical shaft 1 and the front support 2 is transmitted to the front axle tube 4, and then to the first connecting flange 5.1. Meanwhile, the vibration generated at the contact point between the right side of the long cylindrical shaft 1 and the rear support 8 is transmitted to the rear axle tube 7, and then to the second connecting flange 5.3. Due to the presence of the middle rubber layer 5.2 between the first connecting flange 5.1 and the second connecting flange 5.3, the vibration interference on both sides is greatly reduced, achieving the effect of vibration isolation.

[0028] Meanwhile, due to the presence of the middle rubber layer 5.2, it has a certain degree of elasticity and can be stretched (1-5mm) or compressed (-1 to -5mm) in the length direction, which can compensate for the short-distance deviation in the length direction between the front axle tube 4 and the rear axle tube 7. If the deviation in the length direction is too large, it can be compensated by using the length L' of the 6-compensation connecting flange. At the same time, the elasticity of the middle rubber layer 5.2 allows for a certain degree of torsion (1-5mm) in the diameter direction, which can compensate for the short-distance deviation in the vertical height of the front axle tube 4 and the rear axle tube 7. This structure, due to the use of the internal and external meshing of the external teeth 12 and the internal teeth 13, has stronger torsional resistance and a longer service life compared to the front and rear meshing method.

Claims

1. A long cylindrical shaft with a flexible vibration isolation structure, comprising a long cylindrical shaft and a long shaft tube fitted outside the long cylindrical shaft, wherein front and rear supports are respectively provided at both ends of the annular gap between the long cylindrical shaft and the long shaft tube, and the middle section of the annular gap is a cooling water pipe, characterized in that, The long shaft tube is composed of a front shaft tube and a rear shaft tube, and the front shaft tube and the rear shaft tube are sealed and connected by a flexible vibration isolation sealing flange and a compensation sealing flange. The flexible vibration isolation sealing flange consists of a first connecting flange, an intermediate rubber layer, and a second connecting flange that are vulcanized into one piece; the connection between the first and second connecting flanges and the intermediate rubber layer is a toothed meshing part. The intermediate rubber layer has a T-shaped cross-section, with internal teeth on the bottom surfaces of both sides of the T-shaped head, and external teeth on the top surfaces of the first and second connecting flanges facing the intermediate rubber layer that mesh with the internal teeth.

2. The long circular shaft with a flexible vibration isolation structure as described in claim 1, characterized in that, The first connecting flange is bolted to the front axle tube, and the second connecting flange is bolted to the compensating sealing flange.

3. The long circular shaft with a flexible vibration isolation structure as described in claim 2, characterized in that, A first sealing ring is provided between the first connecting flange and the front axle tube, and a second sealing ring is provided between the second connecting flange and the compensating sealing flange.

4. The long circular shaft with a flexible vibration isolation structure as described in claim 1, characterized in that, The compensating sealing flange consists of a front extension section and a rear connecting section, and the rear connecting section is bolted to the rear axle tube.

5. The long circular shaft with a flexible vibration isolation structure as described in claim 4, characterized in that, A third sealing ring is provided between the compensating sealing flange and the rear axle tube.

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