Sealing test structure for performance detection of water lubricated bearing

Abstract

The utility model relates to a bearing performance testing device, in particular to a sealing test structure for detecting the performance of a water lubricated bearing, which comprises a static ring sleeved on a tail shaft and a movable ring clamped on the tail shaft, the front end of the static ring is fixedly connected with the rear end of the water lubricated bearing, and the rear end of the static ring is rotatably connected with the movable ring; wherein a first gap is formed between the static ring and the stern shaft, static ring teeth are arranged on the rear end face of the static ring, a movable ring tooth groove corresponding to the static ring teeth is formed in the front end face of the movable ring, a second gap is formed between the static ring teeth and the movable ring tooth groove, and the second gap is filled with lubricating liquid. The water lubricated bearing vibration noise detection device is extremely simple in structure, low in manufacturing cost, easy to install, capable of being repeatedly used and small in friction noise, the sealing performance is guaranteed, and meanwhile the vibration noise value caused by the water lubricated bearing can be accurately detected.

Description

Technical Field

[0001] This utility model relates to a bearing performance testing device, specifically a sealed test structure for testing the performance of water-lubricated bearings. Background Technology

[0002] Water-lubricated bearings, as crucial components of marine propulsion systems, primarily utilize water or water-based lubricants as the lubricating medium to reduce frictional resistance and bearing wear. During the design phase, water-lubricated bearings require vibration and noise testing of the engineering prototype. During testing, sealing devices must be installed at both ends of the water-lubricated bearing to ensure the circulation of the lubricating medium, such as water, within the bearing bore and the clearance between the bearing and the stern shaft. Traditional sealing structures are costly, and contact-type sealing structures suffer from frictional noise and other issues. Furthermore, they cannot accurately detect the vibration and noise levels generated by the water-lubricated bearing itself during testing, thus affecting the overall vibration and noise performance evaluation of the water-lubricated bearing prototype.

[0003] Publication No. CN216867284U discloses a sealing structure for a wear-resistant water-lubricated bearing, including an outer ring, an inner ring, a protective ring, and rolling elements. The outer ring is fitted over the outer side of the inner ring. The outer wall of the inner ring has a first circular groove, and the outer wall of the inner ring has a second circular groove. The rolling elements are arranged in a plurality of units and are located between the first and second circular grooves. The protective ring is connected to the inner ring and the outer side, and the outer walls of the outer and inner sides of the protective ring are in contact with the outer ring and the inner ring, respectively. This technical solution effectively prevents residues and dust from entering the bearing by enhancing the external sealing effect of the bearing, thus avoiding impact on the internal components of the bearing. However, it does not consider issues such as frictional noise during testing and is not suitable for testing vibration and noise in engineering prototypes. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a sealing test structure for water-lubricated bearing performance testing that is extremely simple in structure, low in manufacturing cost, easy to install, reusable, has low friction noise, ensures sealing performance, and is also conducive to accurately detecting the vibration and noise values ​​caused by the water-lubricated bearing itself.

[0005] The technical solution includes a water-lubricated bearing mounted on the stern shaft, a stationary ring mounted on the stern shaft, and a rotating ring clamped on the stern shaft. The front end of the stationary ring is fixedly connected to the rear end of the water-lubricated bearing, and the rear end is rotatably connected to the rotating ring. There is a first gap between the stationary ring and the stern shaft. The rear end face of the stationary ring is provided with stationary ring teeth, and the front end face of the rotating ring is provided with a rotating ring tooth groove corresponding to the stationary ring teeth. There is a second gap between the stationary ring teeth and the rotating ring tooth groove, and the second gap is filled with lubricating fluid.

[0006] The moving ring consists of two symmetrical semi-rings.

[0007] The two semi-rings of the moving ring are fastened to the stern shaft by bolts and nuts.

[0008] The front flange of the stationary ring is connected to the rear flange of the water-lubricated bearing by bolts and nuts.

[0009] An annular baffle is provided on the outermost tooth groove of the front end face of the rotating ring, and the annular baffle is fixed to the rotating ring by locking bolts.

[0010] The clearance between the inner circular surface of the moving ring and the outer diameter of the stern shaft is 0.08 to 0.28 mm.

[0011] The inner diameter of the stationary ring is 4-5 mm larger than the outer diameter of the stern shaft.

[0012] The width of the second gap between the stationary ring tooth and the moving ring tooth groove is 0.6 to 0.8 mm.

[0013] The inner diameter of the annular baffle is 3-4 mm larger than the outer diameter of the stationary ring.

[0014] Beneficial effects:

[0015] This invention employs an annular grooved tooth structure between the rotating and stationary rings, ensuring that the grooved teeth do not contact each other but maintain a certain gap. Lubricant is filled into this gap to achieve a rotational connection between the two rings, providing a contactless end-face seal. This structure ensures a good seal while being extremely simple, thus minimizing frictional noise during testing. The rotating ring consists of two symmetrical half-rings, bolted and nut-secured onto the stern shaft, rotating with it. This connection method facilitates quick assembly, disassembly, and maintenance, and allows for timely replenishment of lubricant into the gap of the annular grooved tooth structure. An annular baffle is installed on the outermost groove of the rotating ring on the front face to reduce lubricant loss during rotation. This invention features an extremely simple structure, low manufacturing cost, easy installation, reusability, low frictional noise, and ensures sealing performance. It also facilitates accurate detection of vibration noise caused by the water-lubricated bearing itself, improving the overall vibration and noise evaluation performance of the water-lubricated bearing prototype. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is the main view of the rotating ring;

[0018] Figure 3 This is the main view of the stationary ring;

[0019] Figure 4 For the assembly drawing of the moving ring;

[0020] Figure 5 This is a magnified view of the tooth groove fit between the moving ring and the stationary ring.

[0021] Among them, 1. stationary ring; 1-1. stationary ring tooth; 2. moving ring; 2-1. moving ring tooth groove; 2-2. half ring; 3. water-lubricated bearing; 4. stern shaft; 5. annular baffle; 6. locking screw; 7. O-ring seal; 8. first gap; 9. second gap; 10. bolt; 11. nut. Detailed Implementation

[0022] The present invention will be further explained below with reference to the accompanying drawings:

[0023] Referring to the attached diagram, the stern shaft 4 is sequentially fitted with a water-lubricated bearing 3, a stationary ring 1, and a rotating ring 2. A first gap 8 exists between the stationary ring 1 and the stern shaft 4 (preferably, the inner diameter of the stationary ring is 4-5 mm larger than the outer diameter of the stern shaft), and this first gap 8 is filled with circulating water. The mating clearance between the inner surface of the rotating ring 2 and the outer diameter of the stern shaft 4 is 0.08-0.28 mm, and an O-ring seal 7 is installed thereon. The front end of the stationary ring 1 is fixedly connected to the rear end of the water-lubricated bearing 3, and the rear end is rotatably connected to the rotating ring 2. Specifically, the front flange of the stationary ring 1 is connected to the rear end of the water-lubricated bearing 4. The flanges are connected by bolts 10 and nuts 11, with gaskets used for sealing at the connection. O-rings 7 are used to seal the contact surfaces of the front flange of the stationary ring 1 and the rear flange of the water-lubricated bearing 4. As a preferred embodiment of the rotatable connection, the rear end face of the stationary ring 1 has stationary ring teeth 1-1, and the front end face of the rotating ring 2 has a rotating ring tooth groove 2-1 corresponding to the stationary ring teeth 1-1. A second gap 9 exists between the stationary ring teeth 1-1 and the rotating ring tooth groove 2-1, with a width of 0.6–0.8 mm. The second gap 9 is filled with lubricant, such as lithium-based grease. Preferably, an annular baffle 5 is provided on the outermost rotating ring tooth groove 2-1 on the front end face of the rotating ring 2. The annular baffle 5 is fixed to the rotating ring 2 by locking bolts 6. The inner diameter of the annular baffle 5 is 3–4 mm larger than the outer diameter of the stationary ring 1, and its thickness is 2 mm. The outer diameter of the annular baffle 5 is the same as the outer diameter of the rotating ring 2.

[0024] As another embodiment: the moving ring 2 is composed of two symmetrical half-rings 2-2, which are fastened to the stern shaft 4 by bolts 10 and nuts 11, and connected to form a complete moving ring 2.

[0025] During the testing operation, first, the stationary ring 1 is fitted onto the stern shaft 4. The front flange is connected to the rear flange of the water-lubricated bearing 4 via bolts 10 and nuts 11. Then, the two half-rings 2-2 are clamped onto the stern shaft 4 and connected with bolts 10 and nuts 11. At the same time, the stationary ring teeth 1-1 and the moving ring teeth grooves 2-1 are inserted into each other. The second gap 9 is filled with lubricating fluid.

[0026] Finally, the locking bolt 6 is used to cover the outermost moving ring tooth groove 2-1 on the front end face of the moving ring 2 with the annular baffle 5 and the front end face of the moving ring 2.

[0027] The first gap 8 between the water-lubricated bearing 3, the stationary ring 1, and the stern shaft 4 is filled with circulating water. When the rotating ring 2 rotates together with the stern shaft 4, the rotating ring tooth groove 2-1 rotates along the stationary ring tooth 1-1. Due to the presence and isolation of the lubricating fluid, the rotating ring 2 and the stationary ring 1 do not come into contact, thus achieving a non-contact end face seal. The main function of the annular baffle 5 is to prevent the lubricating fluid (or grease) in the rotating ring tooth groove 2-1 from being thrown out when the rotating ring 2 rotates.

[0028] After the test is completed, the annular baffle 5, the two half rings 2-2 and the stationary ring 1 can be removed from the stern shaft 4 in sequence and kept for the next test.

Claims

1. A sealing test structure for testing the performance of a water-lubricated bearing, comprising a stationary ring fitted on a stern shaft and a rotating ring clamped on the stern shaft, wherein the front end of the stationary ring is fixedly connected to the rear end of the water-lubricated bearing, and the rear end is rotatably connected to the rotating ring; wherein, There is a first gap between the stationary ring and the stern shaft. The rear end face of the stationary ring is provided with stationary ring teeth, and the front end face of the rotating ring is provided with rotating ring tooth grooves corresponding to the stationary ring teeth. There is a second gap between the stationary ring teeth and the rotating ring tooth grooves, and the second gap is filled with lubricating fluid.

2. The sealing test structure for testing the performance of water-lubricated bearings as described in claim 1, characterized in that, The moving ring consists of two symmetrical semi-rings.

3. The sealing test structure for testing the performance of water-lubricated bearings as described in claim 2, characterized in that, The two semi-rings of the moving ring are fastened to the stern shaft by bolts and nuts.

4. The sealing test structure for testing the performance of water-lubricated bearings as described in any one of claims 1-3, characterized in that, The front flange of the stationary ring is connected to the rear flange of the water-lubricated bearing by bolts and nuts.

5. The sealing test structure for testing the performance of water-lubricated bearings as described in claim 1, characterized in that, An annular baffle is provided on the outermost tooth groove of the front end face of the rotating ring, and the annular baffle is fixed to the rotating ring by locking bolts.

6. The sealing test structure for testing the performance of water-lubricated bearings as described in claim 1, characterized in that, The clearance between the inner circular surface of the moving ring and the outer diameter of the stern shaft is 0.08 to 0.28 mm.

7. The sealing test structure for testing the performance of water-lubricated bearings as described in claim 1, characterized in that, The inner diameter of the stationary ring is 4-5 mm larger than the outer diameter of the stern shaft.

8. The sealing test structure for testing the performance of water-lubricated bearings as described in claim 1, characterized in that, The width of the second gap between the stationary ring tooth and the moving ring tooth groove is 0.6 to 0.8 mm.

9. The sealing test structure for testing the performance of water-lubricated bearings as described in claim 5, characterized in that, The inner diameter of the annular baffle is 3-4 mm larger than the outer diameter of the stationary ring.

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