Underwater shaft head sealing device

Abstract

The utility model provides an underwater shaft head sealing device, and belongs to the technical field of transmission shaft accessories, the underwater shaft head sealing device comprises a bearing and a shaft sleeve, the shaft sleeve is arranged at the inner ring position of the bearing, a bearing seat is arranged on the outer side of the bearing, and the rear end of the bearing seat is fixedly connected with a rear end cover. According to the scheme, by arranging the step, the spring and the sealing ring, the sealing ring is pushed by a medium to overcome the resistance of the spring to displace, and the pressure is increased when the medium flows out through the counter-acting force provided by the sealing ring, so that impurities can be effectively pushed to be away from the gland, the impurity invasion condition is reduced, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of drive shaft accessories, and particularly relates to an underwater shaft head sealing device. Background Art

[0002] The shaft head is a component that connects the drive shaft and mechanical components, and is used to rotate or twist mechanical elements, transmit power from the mechanical components through the drive shaft, reduce the friction and wear of the machine, and improve the operating efficiency of the machine. In the harsh underwater working environment, due to reasons such as poor lubrication, entry of impurities, or external force impact, the shaft head is prone to wear, and in severe cases, the shaft head may even break, seriously affecting production efficiency and equipment safety. The research on how to improve the underwater service life of the shaft head is constantly advancing;

[0003] In the prior art, some solutions have been given. For example, an underwater shaft head sealing device with the publication number CN211525362U has a diversion pipe provided on the gland. Clean water is introduced through the diversion pipe, and the clean water enters the gap between the gland and the outer baffle along the through holes on the gland. Since the pressure of the clean water is greater than the pressure of the ambient water, it is not easy for the ambient water to enter the joint surface between the shaft sleeve and the gland, thereby preventing the wear of the sealing ring by the sediment in the ambient water;

[0004] However, when the device is actually used, when the clean water overflows along the gap between the gland and the outer baffle, due to the increase in the flow channel, the pressure decreases and it is unable to effectively push the impurities, resulting in poor sealing performance, and there is still a situation where impurities invade and cause bearing wear;

[0005] Therefore, the present application provides an underwater shaft head sealing device to meet the requirements. Summary of the Utility Model

[0006] In view of this, the purpose of the present application is to provide an underwater shaft head sealing device to improve the sealing performance, delay the wear of the bearing, and improve the use effect.

[0007] To solve the above technical problems, the present application provides the following technical solutions:

[0008] An underwater shaft head sealing device includes a bearing and a shaft sleeve. The shaft sleeve is arranged at the inner ring position of the bearing. A bearing seat is arranged outside the bearing. The rear end of the bearing seat is tightly connected with a rear end cover. The front end of the bearing seat is tightly connected with a front end cover. A groove distributed radially is opened at the inner ring position of the front end cover. An interface communicating with the groove in its inner ring is opened on the outer side wall of the front end cover. A sealing ring I is attached to the side wall of the inner ring groove of the front end cover close to the bearing. A gland is tightly connected to the front section of the front end cover. A step is arranged outside the shaft sleeve. A groove is opened on the side of the step facing the bearing. A spring is embedded inside the groove of the step. The other end of the spring is connected with a sealing ring.

[0009] Preferably, two seals II are arranged side by side at the inner ring position of the front end cover.

[0010] Preferably, a communication hole facing the seal II is formed in the side wall of the inner ring groove of the front end cover.

[0011] Preferably, a groove is formed on one side of the sealing ring facing the shaft sleeve, and a seal III is arranged in the inner ring groove of the sealing ring.

[0012] Preferably, a boss is arranged at the outer ring edge of the sealing ring, and the outer ring diameter of the boss is the same as the outer ring diameter of the gland.

[0013] Preferably, a key connection is provided between the sealing ring and the step.

[0014] Preferably, the outer ring diameter of the gland is the same as the outer ring diameter of the front end face of the front end cover.

[0015] Preferably, a groove is formed in the middle of the outer side of the front end cover, and the interface is arranged in the groove in the middle of the outer side of the front end cover.

[0016] Compared with the prior art, the present application has at least the following beneficial effects:

[0017] In the above solution, by arranging the step, the spring and the sealing ring, the sealing ring is pushed by the medium to overcome the resistance of the spring and displace, and the reaction force provided by the sealing ring increases the pressure when the medium flows out, so as to effectively push the impurities away from the gland, thereby reducing the situation of impurity intrusion and prolonging the service life of the bearing.

[0018] In the above solution, by arranging the front end cover and the seal I, due to the action of the seal I, a sealing effect is achieved between the front end cover and the shaft sleeve. At the same time, since the seal I is arranged in the inner ring groove of the front end cover, the pressure of the medium can act on the seal I, increasing the contact surface pressure between the seal I, the shaft sleeve and the front end cover, and strengthening the sealing effect.

[0019] In the above solution, by arranging the front end cover and the seal II, the through hole provided on the side wall of the inner ring groove of the front end cover is opened when the seal I fails, so that the medium can act on the seal II, increasing the contact surface pressure between the seal II, the shaft sleeve and the front end cover, and achieving a sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the specification, are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0021] Figure 1Schematic diagram of the overall structure in this application;

[0022] Figure 2 Cross-sectional view of the overall structure in this application;

[0023] Figure 3 Schematic diagram of the seal ring structure in this application;

[0024] Figure 4 In this application Figure 2 Schematic diagram of the enlarged structure at position A in

[0025] [Reference numerals]

[0026] Bearing 1, bushing 2, step 201, spring 202, seal ring 203, seal ring three 204, boss 205, bearing housing 3, rear end cover 4, front end cover 5, interface 501, seal ring one 502, seal ring two 503, gland 6. Detailed implementation manners

[0027] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, an underwater shaft head seal device provided by an embodiment of this application includes a bearing 1 and a bushing 2. A bushing 2 is arranged at the inner ring position of the bearing 1, a bearing housing 3 is arranged outside the bearing 1, a rear end cover 4 is tightly connected to the rear end of the bearing housing 3, a front end cover 5 is tightly connected to the front end of the bearing housing 3. A groove distributed radially is opened at the inner ring position of the front end cover 5, an interface 501 communicated with the groove in its inner ring is opened on the outer side wall of the front end cover 5, a seal ring one 502 is attached to the side wall of the inner ring groove of the front end cover 5 close to the bearing 1, a gland 6 is tightly connected to the front section of the front end cover 5. A step 201 is arranged outside the bushing 2, a groove is opened on the side of the step 201 facing the bearing 1, a spring 202 is embedded in the groove of the step 201, and the other end of the spring 202 is connected to a seal ring 203;

[0028] During actual use, the interface 501 is connected to an external pressure source, a medium is introduced into the interface 501, and the medium overflows at the connection between the gland 6 and the bushing 2. The pressure of the medium is used to counteract the pressure of the external water body, so as to achieve the effect of blocking impurities from invading the connection position between the bushing 2 and the front end cover 5;

[0029] Due to the effect of the seal ring one 502, it plays a sealing role between the front end cover 5 and the bushing 2. At the same time, since the seal ring one 502 is arranged in the inner ring groove of the front end cover 5, the pressure of the medium can act on the seal ring one 502, increasing the contact surface pressure between the seal ring one 502, the bushing 2 and the front end cover 5, and strengthening the sealing effect;

[0030] The medium flows out towards the position of the sealing ring 203. Blocked by the sealing ring 203, the medium pushes the sealing ring 203 to displace against the resistance of the spring 202. The reaction force provided by the sealing ring 203 increases the pressure when the medium flows out, so as to effectively push the impurities away from the gland 6, thereby reducing the situation of impurity intrusion and prolonging the service life of the bearing 1.

[0031] In this embodiment, as Figures 2 - 4 shown, two sealing rings II 503 are arranged side by side at the inner ring position of the front end cover 5;

[0032] The two sealing rings II 503 arranged in the front end cover 5 have a sealing effect. By arranging multiple sealing rings II 503, the resistance and path of moisture and impurity penetration are increased, achieving a good effect of preventing impurity intrusion.

[0033] Communication holes facing the sealing rings II 503 are provided on the side wall of the inner ring groove of the front end cover 5;

[0034] The through holes provided on the side wall of the inner ring groove of the front end cover 5 are opened when the sealing ring I 502 fails, enabling the medium to act on the sealing rings II 503, increasing the contact surface pressure between the sealing rings II 503 and the shaft sleeve 2 and the front end cover 5, and achieving a sealing effect.

[0035] A groove is provided on the side of the sealing ring 203 facing the shaft sleeve 2, and a sealing ring III 204 is arranged in the inner ring groove of the sealing ring 203;

[0036] The sealing ring III 204 is arranged on the sealing ring 203 to avoid the situation of impurities remaining on the sealing ring 203 and reduce the situation of impurities contacting the connection part of the gland 6 and the shaft sleeve 2.

[0037] A boss 205 is provided at the outer ring edge of the sealing ring 203, and the outer ring diameter of the boss 205 is the same as the outer ring diameter of the gland 6;

[0038] The boss 205 further diverts the medium to the edge of the gland 6, facilitating the medium to push the impurities away from the gland 6, thereby reducing the situation of impurity intrusion and prolonging the service life of the bearing 1.

[0039] A groove is provided in the middle of the outer side of the front end cover 5, and the interface 501 is arranged in the groove in the middle of the outer side of the front end cover 5;

[0040] The groove provided on the front end cover 5 further shields the interface 501, reducing the situation of the interface 501 being affected by external objects.

Claims

1. An underwater shaft head sealing device, comprising a bearing (1) and a shaft sleeve (2), wherein the inner ring of the bearing (1) is provided with the shaft sleeve (2), characterized in that: A bearing seat (3) is arranged on the outer side of the bearing (1), a rear end cover (4) is fastened to the rear end of the bearing seat (3), a front end cover (5) is fastened to the front end of the bearing seat (3), a radially distributed groove is provided at the inner ring position of the front end cover (5), an interface (501) connected to the groove of its inner ring is provided on the outer wall of the front end cover (5), a sealing ring (502) is attached to the inner ring groove of the front end cover (5) near the side wall of the bearing (1), a pressure cover (6) is fastened to the front section of the front end cover (5), a step (201) is arranged on the outer side of the shaft sleeve (2), a groove is provided on the side of the step (201) facing the bearing (1), a spring (202) is embedded in the groove of the step (201), and a sealing ring (203) is connected to the other end of the spring (202).

2. The underwater shaft head sealing device according to claim 1, characterized in that: Two sealing rings 2 (503) arranged side by side are arranged at the inner circle position of the front end cover (5).

3. The underwater shaft head sealing device according to claim 2, characterized in that: The inner groove side wall of the front end cover (5) is provided with a communication hole facing the second sealing ring (503).

4. The underwater shaft head sealing device according to claim 1, characterized in that: The sealing ring (203) is provided with a groove on one side facing the shaft sleeve (2), and a sealing ring three (204) is provided in the inner ring groove of the sealing ring (203).

5. The underwater shaft head sealing device according to claim 4, characterized in that: The outer ring edge of the sealing ring (203) is provided with a boss (205), and the outer ring diameter of the boss (205) is the same as the outer ring diameter of the gland (6).

6. The underwater shaft head sealing device according to claim 5, characterized in that: The sealing ring (203) and the step (201) are connected by a key.

7. The underwater shaft head sealing device according to claim 1, characterized in that: The outer diameter of the gland (6) is the same as the outer diameter of the front end surface of the front end cover (5).

8. The underwater shaft head sealing device according to claim 1, characterized in that: A groove is provided in the middle of the outer side of the front end cover (5), and the interface (501) is arranged in the groove in the middle of the outer side of the front end cover (5).

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