Corrosion-resistant enhanced high-pressure shaft sealing device

Abstract

The invention relates to the technical field of sealing devices, in particular to a corrosion-resistant enhanced high-pressure shaft sealing device which comprises a first sealing ring, a first sealing body is mounted in the first sealing ring, a first sealing lip is arranged on the inner side of the first sealing body, one axial side of the first sealing ring is an oil side, and the opposite side of the first sealing ring is an air side. The air side of the first sealing ring is coaxially connected with a second sealing ring, a second sealing body is installed on the inner side of the second sealing ring, a second sealing lip is arranged on the inner side of the second sealing body, an expanding ring is movably arranged on the portion, on the air side of the second sealing body, of the inner side of the second sealing ring in the axial direction, and when the expanding ring moves towards the oil side, the second sealing lip is arranged on the inner side of the second sealing body. The second sealing lip slides against the inner side of the second sealing lip, and the inner diameter of the second sealing lip is enlarged. The shaft sealing device solves the problems that as multiple layers of sealing bodies of an existing shaft sealing device make contact with a shaft body at the same time, the sealing bodies which do not make direct contact with liquid can abrade with the shaft body along with the increase of working time, and the sealing performance of the sealing bodies is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing devices, and in particular to a corrosion-resistant enhanced high-pressure shaft sealing device. Background Art

[0002] The function of sealing is to prevent high-pressure liquid from leaking out and prevent air from entering. Although the shaft seal occupies a small position in the machine, whether the shaft can operate normally is closely related to the shaft seal. If the shaft seal is not properly selected, not only frequent repairs are required during operation, leaking a lot of the conveyed liquid, but also accidents such as fires, explosions, and poisoning may be caused by the leaked flammable, explosive, and toxic liquids, and the consequences are unthinkable. Therefore, it is necessary to reasonably select the shaft seal structure to ensure the safe operation of the machine.

[0003] At present, there are various shaft seal structures, including a single-seal-body sealing structure and a multi-layer-seal-body sealing structure. The multi-layer defense is achieved by arranging the multi-layer seal bodies along the length direction of the shaft body, so that when the first seal body is damaged, the subsequent seal bodies can replace it to play the role of shaft sealing. However, in the prior art, the multi-layer seal bodies used are all in contact with the shaft body during operation, resulting in mutual wear between the seal bodies that are not directly in contact with the liquid and the shaft body as the working time increases, leading to a decrease in their sealing performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a corrosion-resistant enhanced high-pressure shaft sealing device, which solves the problem in the prior art that the multi-layer seal bodies of the shaft sealing device are in contact with the shaft body at the same time, resulting in mutual wear between the seal bodies that are not directly in contact with the liquid and the shaft body as the working time increases, leading to a decrease in their sealing performance.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A corrosion-resistant enhanced high-pressure shaft sealing device includes a first sealing ring. A first installation groove is provided inside the first sealing ring, and a first seal body is installed in the first installation groove. A first sealing lip is provided inside the first seal body. One side of the first sealing ring in the axial direction is the oil side, and the opposite side is the air side. A second sealing ring is coaxially connected to the air side of the first sealing ring. A second installation groove is provided inside the second sealing ring, and a second seal body is installed in the second installation groove. A second sealing lip is provided inside the second seal body. A diameter-expanding ring is movably provided axially on the air side of the second seal body inside the second sealing ring. When the diameter-expanding ring moves towards the oil side, it slides along the inner side of the second sealing lip and expands the inner diameter of the second sealing lip. Both the first seal body and the second seal body are made of elastic sealing materials.

[0007] A further technical solution is that the second sealing ring is provided with an annular driving cavity on the air side of the second mounting groove, a driving ring hole connected to the driving cavity is provided on the inner side of the second sealing ring, a first push ring is provided in the driving cavity for axial sliding, a second push ring is provided in the driving ring hole for axial sliding, the outer edge of the second push ring penetrates into the driving cavity and is connected to the first push ring, and the inner edge of the second push ring is connected to the expansion ring on the inner side of the second sealing ring; an air hole connected to the driving cavity is provided on the outer side of the second sealing ring, and the air hole is connected to an external air supply device; the air hole is close to the cavity wall of the driving cavity facing the air side; the cavity wall of the driving cavity is provided with a limiting block on the oil side of the air hole.

[0008] A further technical solution is that a monitoring hole is recessed on the air side of the first sealing body on the inner side of the first sealing ring, and a CCD camera assembly is installed in the monitoring hole.

[0009] A further technical solution is that the CCD camera assembly includes a mounting tube, which is installed in the monitoring hole through a thread, and one end of the mounting tube close to the inner side of the first sealing ring is sealed by glass, and a CCD camera unit and an LED lighting unit are installed in the mounting tube.

[0010] A further technical solution is that a mounting hole is provided in a recessed manner on the cavity wall of the driving cavity facing the air side, and a distance sensor aligned with the first push ring is installed in the mounting hole.

[0011] A further technical solution is that a first elastic O-ring is sleeved on the outer side of the first sealing lip, and a second elastic O-ring is sleeved on the outer side of the second sealing lip; the first sealing body and the second sealing body are made of nitrile rubber or perfluoroether rubber.

[0012] A further technical solution is that the air side of the first sealing ring is coaxially connected to a mounting ring, a first thread is arranged around the inner side of the mounting ring, and a second thread matching the first thread is arranged around the outer side of the second sealing ring. The second sealing ring is installed in the mounting ring, and the first thread and the second thread are threadedly matched and connected; the fitting surface of the first sealing ring and the second sealing ring is sealed by the first sealing ring.

[0013] A further technical solution is that a dustproof ring is coaxially installed on the air side of the second sealing ring, a dustproof groove is recessed inside the dustproof ring, and a dustproof sealing lip is installed in the dustproof groove.

[0014] A further technical solution is that the outer diameter of the diameter expansion ring gradually decreases from the air side to the oil side, presenting a variable diameter state, and the oil side end of the diameter expansion ring is an elliptical tip.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: Under the normal working operation state of the sealing device, the first sealing body participates in the sealing work of the shaft body. The first sealing lip of the first sealing body fits the surface of the shaft body to separate the oil side and the air side. At this time, the diameter-expanding ring is inserted between the shaft body and the second sealing lip, separating the second sealing lip from the surface of the shaft body. When the first sealing body is damaged, causing the liquid on the oil side to leak along the surface of the shaft body from the position of the first sealing lip, the diameter-expanding ring moves towards the air side and moves away from between the second sealing lip and the shaft body, enabling the second sealing lip to fit the surface of the shaft body under its own elasticity and replacing the first sealing lip to seal the shaft body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of an anti-corrosion enhanced high-pressure shaft sealing device of the present invention installed on a shaft body.

[0017] Figure 2 It is a schematic cross-sectional view of an anti-corrosion enhanced high-pressure shaft sealing device of the present invention.

[0018] Reference numerals: 1 - first sealing ring, 2 - first installation groove, 3 - first sealing body, 4 - first sealing lip, 5 - second sealing ring, 6 - second installation groove, 7 - second sealing body, 8 - second sealing lip, 9 - diameter-expanding ring, 10 - driving cavity, 11 - driving ring hole, 12 - first pushing ring, 13 - second pushing ring, 14 - air hole, 15 - limiting block, 16 - monitoring hole, 17 - installation pipe, 18 - glass, 19 - CCD camera unit, 20 - installation hole, 21 - distance sensor, 22 - first elastic O-ring, 23 - second elastic O-ring, 24 - installation ring, 25 - first sealing ring, 26 - dust-proof ring, 27 - dust-proof card slot, 28 - dust-proof sealing lip, 29 - tip, 30 - shaft body, 31 - housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Figures 1 to 2 The following shows an embodiment of the present invention.

[0021] Embodiment:

[0022] An anti-corrosion enhanced high-pressure shaft sealing device includes a first sealing ring 1. A first installation groove 2 is provided inside the first sealing ring 1. A first sealing body 3 is installed in the first installation groove 2. A first sealing lip 4 is provided inside the first sealing body 3. One axial side of the first sealing ring 1 is the oil side. Figure 1The right side shown in [figure] is the opposite side, and the other side is the air side. Figure 1 On the left side shown in [figure], a second sealing ring 5 is coaxially connected to the air side of the first sealing ring 1. A second mounting groove 6 is provided inside the second sealing ring 5. A second sealing body 7 is installed in the second mounting groove 6. A second sealing lip 8 is provided inside the second sealing body 7. A diameter-expanding ring 9 is movably arranged axially on the air side of the second sealing body 7 inside the second sealing ring 5. When the diameter-expanding ring 9 moves towards the oil side, it slides along the inner side of the second sealing lip 8 and expands the inner diameter of the second sealing lip 8. Both the first sealing body 3 and the second sealing body 7 are made of elastic sealing materials. Under the normal working state of the sealing device, the first sealing body 3 participates in the sealing work of the shaft body 30. The first sealing lip 4 of the first sealing body 3 fits the surface of the shaft body 30 to separate the oil side and the air side. At this time, the diameter-expanding ring 9 is inserted between the shaft body 30 and the second sealing lip 8, separating the second sealing lip 8 from the surface of the shaft body 30. When the first sealing body 3 is damaged, causing the liquid on the oil side to leak along the surface of the shaft body 30 from the position of the first sealing lip 4, the diameter-expanding ring 9 moves towards the air side and moves away from between the second sealing lip 8 and the shaft body 30, enabling the second sealing lip 8 to fit the surface of the shaft body 30 under its own elasticity and replace the first sealing lip 4 to seal the shaft body 30. The first sealing ring 1 is installed on the air side of the housing 31 of the shaft body 30. Reinforcing skeletons are provided inside both the first sealing body 3 and the second sealing body 7 to enhance the strength of the first sealing body 3 and the second sealing body 7.

[0023] The second sealing ring 5 is provided with an annular driving cavity 10 on the air side of the second installation groove 6. An inner side of the second sealing ring 5 is provided with a driving ring hole 11 communicating with the driving cavity 10. A first pushing ring 12 is slidably arranged along the axial direction in the driving cavity 10. A second pushing ring 13 is slidably arranged along the axial direction in the driving ring hole 11. An outer edge of the second pushing ring 13 penetrates into the driving cavity 10 and is connected with the first pushing ring 12. An inner edge of the second pushing ring 13 is connected with an expanding diameter ring 9 on the inner side of the second sealing ring 5. An outer side of the second sealing ring 5 is provided with an air hole 14 communicating with the driving cavity 10. The air hole 14 is connected with an external air supply device. The air hole 14 is close to a cavity wall of the driving cavity 10 facing the air side. A limiting block 15 is arranged on the cavity wall of the driving cavity at the oil side of the air hole 14. When the second sealing body 7 is not required to be used, the external air supply device is used to inflate the driving cavity 10, so that the gas in the driving cavity 10 pushes the first pushing ring 12 to move towards the oil side, thereby driving the expanding diameter ring 9 to be placed inside the second sealing lip 8 by means of the second pushing ring 13, so that the second sealing lip 8 is separated from the shaft body 30, and contact between the second sealing lip 8 and the shaft body 30 is avoided. When the first sealing lip 4 fails and leakage starts to occur, the external air supply device is used to extract the gas in the driving cavity 10, so that the expanding diameter ring 9 can be driven to move towards the air side by means of the first pushing ring 12 and the second pushing ring 13, so that the expanding diameter ring 9 can be moved away from the inside of the second sealing lip 8, so that the second sealing lip 8 fits the surface of the shaft body 30 under its own elastic action, playing a sealing role. By arranging the limiting block 15, it is possible to prevent the first pushing ring 12 from moving excessively in the driving cavity 10 and blocking the air hole 14.

[0024] On the air side of the first sealing body 3, a monitoring hole 16 is recessedly arranged on the inner side of the first sealing ring 1. A CCD camera assembly is installed in the monitoring hole 16. By arranging the monitoring hole 16 and the CCD camera assembly, the surface of the shaft body 30 on the air side of the first sealing lip 4 can be photographed, and the photographed image is transmitted to the control system. When the control system monitors that there is liquid on the surface of the shaft body 30 through the photographed image, it indicates that the first sealing lip 4 starts to fail and leakage occurs. At this time, the control system controls the external air supply device, so that the second sealing lip 8 fits the shaft body 30, and the second sealing lip 8 starts to work.

[0025] The CCD camera assembly includes an installation pipe 17 which is threadedly installed in the monitoring hole 16. One end of the installation pipe 17 close to the inner side of the first sealing ring 1 is closed by a glass 18. A CCD camera unit 19 and an LED lighting unit are installed in the installation pipe 17. Through the installation pipe 17, the CCD camera unit 19 and the LED lighting unit can be well protected, preventing the liquid from contaminating the CCD camera unit 19 and the LED lighting unit in case of leakage. By connecting the installation pipe 17 and the monitoring hole 16 in a threaded manner, the monitoring hole 16 can be blocked by the installation pipe 17, thus preventing the liquid from entering the monitoring hole 16. When necessary, a sealing tape can also be set between the monitoring hole 16 and the installation pipe 17. A wire hole communicating with the bottom of the monitoring hole 16 is provided on the outer wall of the first sealing ring 1, and the CCD camera unit 19 and the LED lighting unit are connected to the control system through the wire hole.

[0026] The cavity wall of the driving cavity 10 facing the air side is recessed to form an installation hole 20, and a distance sensor 21 for aligning with the first pushing ring 12 is installed in the installation hole 20. By providing the installation hole 20 and the distance sensor 21, the position of the first pushing ring 12 can be monitored at any time, preventing the first pushing ring 12 from moving in the driving cavity 10 when it is not required to move due to errors in external air supply equipment.

[0027] A first elastic O-ring 22 is sleeved outside the first sealing lip 4, and a second elastic O-ring 23 is sleeved outside the second sealing lip 8; the materials of the first sealing body 3 and the second sealing body 7 are nitrile rubber or perfluoroether rubber, and these materials all have good corrosion resistance and elasticity, thus adapting to the shaft sealing work. By providing the first elastic O-ring 22, the sealing self-tightening force of the first sealing lip 4 can be compensated. By providing the second elastic O-ring 23, the sealing self-tightening force of the second sealing lip 8 can be compensated, enabling it to be used in a high-pressure environment.

[0028] An installation ring 24 is coaxially connected to the air side of the first sealing ring 1. A first thread is provided around the inner side of the installation ring 24, and a second thread matching the first thread is provided around the outer side of the second sealing ring 5. The second sealing ring 5 is installed in the installation ring 24, and the first thread and the second thread are threadedly matched and connected; the joint surface between the first sealing ring 1 and the second sealing ring 5 is sealed by a first sealing ring 25. By providing the installation ring 24, the second sealing ring 5 can be well installed on the air side of the first sealing ring 1, and at the same time, the gap between the first sealing ring 1 and the second sealing ring 5 can be sealed by means of the first sealing ring 25, preventing leakage from this position.

[0029] A dust-proof ring 26 is coaxially installed on the air side of the second sealing ring 5. A dust-proof card slot 27 is recessed on the inner side of the dust-proof ring 26, and a dust-proof sealing lip 28 is installed in the dust-proof card slot 27. By providing the dust-proof ring 26 and the dust-proof sealing lip 28, it is possible to prevent dust from entering the gap between the second sealing ring 5 and the first sealing ring 1 and the shaft body 30 from the air side of the second sealing ring 5.

[0030] The outer diameter of the diameter-expanding ring 9 gradually decreases from the air side to the oil side, presenting a diameter-changing state, and the oil-side end of the diameter-expanding ring 9 is an elliptical tip 29. With such a setting, when the diameter-expanding ring 9 moves towards the oil side, it can fit well with the inner side of the second sealing lip 8, and gradually separates the second sealing lip 8 from the shaft body 30 during the moving process. By providing the elliptical tip 29, it is possible to prevent scratching of the second sealing lip 8.

[0031] Although the present invention has been described herein with reference to a number of illustrative embodiments of the present invention, it should be understood that those skilled in the art can design many other modifications and embodiments that will fall within the scope of the principles and spirit disclosed in this application. More specifically, within the scope of the disclosure, the drawings, and the claims of this application, various variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. An enhanced high-pressure shaft sealing device with corrosion resistance, comprising a first sealing ring (1). A first installation groove (2) is arranged inside the first sealing ring (1), and a first sealing body (3) is installed in the first installation groove (2). A first sealing lip (4) is arranged inside the first sealing body (3). One axial side of the first sealing ring (1) is the oil side, and the opposite side is the air side. It is characterized in that, A second sealing ring (5) is coaxially connected to the air side of the first sealing ring (1). A second mounting groove (6) is provided inside the second sealing ring (5). A second sealing body (7) is installed in the second mounting groove (6). A second sealing lip (8) is provided inside the second sealing body (7). An expansion ring (9) is axially movably provided on the air side of the second sealing body (7) inside the second sealing ring (5). When the expansion ring (9) moves towards the oil side, it slides along the inner side of the second sealing lip (8) and expands the inner diameter of the second sealing lip (8). Both the first sealing body (3) and the second sealing body (7) are made of elastic sealing materials.

2. The enhanced high-pressure shaft seal device with corrosion resistance according to claim 1, characterized in that: The second sealing ring (5) is provided with an annular driving cavity (10) on the air side of the second mounting groove (6). A driving ring hole (11) communicating with the driving cavity (10) is provided inside the second sealing ring (5). A first pushing ring (12) is slidably arranged axially in the driving cavity (10). A second pushing ring (13) is slidably arranged axially in the driving ring hole (11). The outer edge of the second pushing ring (13) penetrates into the driving cavity (10) and is connected to the first pushing ring (12). The inner edge of the second pushing ring (13) is connected to the expansion ring (9) inside the second sealing ring (5). An air hole (14) communicating with the driving cavity (10) is provided on the outer side of the second sealing ring (5). The air hole (14) is connected to an external air supply device. The air hole (14) is close to the air-side cavity wall of the driving cavity (10). A limiting block (15) is provided on the oil-side cavity wall of the driving cavity (10) where the air hole (14) is located.

3. An enhanced high-pressure shaft sealing device with corrosion resistance according to claim 1, characterized in that: A monitoring hole (16) is recessed on the air side of the first sealing body (3) inside the first sealing ring (1). A CCD camera assembly is installed in the monitoring hole (16).

4. An enhanced high-pressure shaft sealing device with corrosion resistance according to claim 3, characterized in that: The CCD camera assembly includes a mounting tube (17). The mounting tube (17) is installed in the monitoring hole (16) by means of threads. One end of the mounting tube (17) close to the inner side of the first sealing ring (1) is closed by glass (18). A CCD camera unit (19) and an LED lighting unit are installed in the mounting tube (17).

5. The enhanced high-pressure shaft sealing device with corrosion resistance according to claim 2, characterized in that: A mounting hole (20) is recessed on the air-side cavity wall of the driving cavity (10). A distance sensor (21) aligned with the first pushing ring (12) is installed in the mounting hole (20).

6. The enhanced high-pressure shaft sealing device with corrosion resistance according to claim 1, characterized in that: A first elastic O-ring (22) is sleeved on the outer side of the first sealing lip (4). A second elastic O-ring (23) is sleeved on the outer side of the second sealing lip (8). The materials of the first sealing body (3) and the second sealing body (7) are nitrile rubber or perfluoroether rubber.

7. An enhanced high-pressure shaft sealing device with corrosion resistance according to claim 1, characterized in that: The air side of the first sealing ring (1) is coaxially connected to a mounting ring (24), a first thread is provided around the inner side of the mounting ring (24), and a second thread matching the first thread is provided around the outer side of the second sealing ring (5), the second sealing ring (5) is installed in the mounting ring (24), and the first thread and the second thread are thread-matched and connected; the fitting surfaces of the first sealing ring (1) and the second sealing ring (5) are sealed by a first sealing ring (25).

8. An enhanced high-pressure shaft sealing device with corrosion resistance according to claim 1, characterized in that: A dustproof ring (26) is coaxially mounted on the air side of the second sealing ring (5), a dustproof groove (27) is recessed inside the dustproof ring (26), and a dustproof sealing lip (28) is mounted inside the dustproof groove (27).

9. An enhanced high-pressure shaft seal device with corrosion resistance according to claim 1, characterized in that: The outer diameter of the expansion ring (9) gradually decreases from the air side to the oil side, and the oil side end of the expansion ring (9) is an elliptical tip (29).

Images