Double-lip dustproof sealing ring

Abstract

The utility model discloses a double-lip dustproof sealing ring which comprises a sealing ring body, two vertically arranged inner lips are arranged in the sealing ring body, a V-shaped groove is formed between the two inner lips, two outer lips are arranged on the outer side of the sealing ring body, and a clamping groove is formed between the two outer lips. An inverted-T-shaped annular groove is formed in the top of the sealing ring body. Dustproof sealing is carried out on the piston rod through the inner lip, the sealing ring in the inverted-T-shaped annular groove is rotated to enable the bottom end of the oil filling opening to be aligned with the top end of the channel, then lubricating oil is filled, after filling is completed, the sealing ring is rotated again to enable the oil filling opening and the channel to be staggered, and sealing of the internal lubricating oil is achieved. Therefore, the device has the advantages of being easy to operate, good in sealing performance, better in sealing stability for lubricating oil during operation and capable of improving the use stability.

Description

Technical Field

[0001] The utility model relates to the technical field of shield machine sealing rings, and more specifically to a double-lip dustproof sealing ring. Background Art

[0002] A shield machine, or tunnel boring machine, is a special engineering machinery for tunnel excavation. Modern shield tunnel boring machines integrate optical, mechanical, electrical, hydraulic, sensor, and information technologies. They have functions such as excavating and cutting soil, transporting soil and slag, assembling tunnel linings, measuring and guiding, and correcting deviations. They involve multiple disciplines and technologies such as geology, civil engineering, mechanics, mechanics, hydraulics, electricity, control, and measurement. They must be designed and manufactured "tailor-made" according to different geological conditions, and have extremely high reliability requirements. Shield tunnel boring machines have been widely used in tunnel projects such as subways, railways, highways, municipal engineering, and hydropower. A sealing dust ring is installed on the guide sleeve of the shield machine to prevent coal dust or other impurities from entering the cavity.

[0003] Patent application number 201921119838.7 discloses a double-lip dustproof seal ring, specifically relating to the field of seal ring technology, including a dustproof seal mechanism, the dustproof seal mechanism comprising a dustproof seal ring body, the top of the dustproof seal ring body being machined with a main lip, the top of the inner wall of the dustproof seal ring body being machined with a lip back, the inner wall of the dustproof seal ring body being integrally formed with a secondary lip, the secondary lip being arranged below the lip back, and the outer end of the dustproof seal ring body being provided with a slot. The utility model uses the main lip and the secondary lip of the dustproof seal ring body to double-seal the gap between the guide sleeve and the piston of the shield machine, effectively preventing coal dust or other impurities from entering the cavity through the gap and protecting the piston rod and the inside of the guide sleeve, while also achieving a good sealing and dustproof effect.

[0004] However, in order to facilitate the addition of lubricating oil, the double-lip seal is generally provided with a refueling hole, and the refueling hole needs to be sealed when the equipment is working. This leads to the risk of the hole sealing structure falling off during continuous high-pressure operation. Once it falls off, the internal lubricating oil will quickly leak through the refueling hole under high pressure, reducing the stability of the device. Utility Model Content

[0005] In response to the problems existing in the prior art, the purpose of the utility model is to provide a double-lip dustproof sealing ring, which realizes the movable connection and closure of the oil filling port and the channel through the sealing ring inside the convex ring groove, and has better sealing stability for the lubricating oil during operation.

[0006] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0007] A double-lip dustproof sealing ring includes a sealing ring body, two vertically arranged inner lips are provided inside the sealing ring body, a V-shaped groove is provided between the two inner lips, two outer lips are provided on the outside of the sealing ring body, a clamping groove is provided between the two outer lips, a convex ring groove is provided on the top of the sealing ring body, a sealing ring that can rotate in the groove is provided inside the convex ring groove, an oil filling port is fixedly installed on the sealing ring, and a channel that cooperates with the oil filling port is provided inside the sealing ring body.

[0008] As a further description of the above technical solution: one inward end of the channel is connected to the interior of the V-shaped groove, and the other end of the channel extends to the interior of the convex ring groove and is connected and matched with the oil filling port.

[0009] As a further description of the above technical solution: a metal ring is fixedly connected to the interior of the sealing ring body.

[0010] As a further description of the above technical solution: the interior of the V-shaped groove is fixedly connected with annularly distributed rubber blocks.

[0011] As a further description of the above technical solution: the outer side surfaces of the two outer lips are arc-shaped.

[0012] As a further description of the above technical solution: the two inner lips correspond horizontally to the two outer lips respectively, and the inner side cross-section of the inner lips is V-shaped.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] This solution achieves movable connection and closure between the oil filling port and the channel through a sealing ring inside the convex ring groove, thereby achieving the advantages of simple operation and good sealing performance of the device. At the same time, it has better sealing stability for the lubricating oil during operation, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present utility model;

[0017] Figure 3 for Figure 1 A magnified schematic diagram of the structure of part A in the middle;

[0018] Figure 4 It is a schematic diagram of the top cross-sectional structure of the utility model.

[0019] Description of the numbers in the figure:

[0020] 1. Sealing ring body; 2. Inner lip; 3. V-shaped groove; 31. Rubber block; 4. Outer lip; 5. Slot; 6. Convex ring groove; 7. Sealing ring; 8. Oil filling port; 9. Channel; 10. Metal ring. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] See also Figures 1 to 4 In the utility model, a double-lip dustproof sealing ring includes a sealing ring body 1, two vertically arranged inner lips 2 are provided inside the sealing ring body 1, a V-shaped groove 3 is provided between the two inner lips 2, two outer lips 4 are provided on the outside of the sealing ring body 1, a clamping groove 5 is provided between the two outer lips 4, a convex ring groove 6 is provided on the top of the sealing ring body 1, a sealing ring 7 that can rotate in the groove is provided inside the convex ring groove 6, an oil filling port 8 is fixedly installed on the sealing ring 7, and a channel 9 that cooperates with the oil filling port 8 is provided inside the sealing ring body 1.

[0023] In the present invention, the sealing ring body 1 is used as the main structure. When in use, the sealing ring body 1 is installed on the guide sleeve of the shield machine, and the sealing ring body 1 is put on the piston rod, and the card groove 5 is matched with the guide sleeve to realize installation. When the equipment is running, the two outer lips 4 seal the connection between the guide sleeves, and the inner lip 2 performs dust-proof sealing on the piston rod. When lubricating oil needs to be added, it is only necessary to rotate the sealing ring 7 inside the convex ring groove 6 so that the bottom end of the oil filling port 8 is aligned with the top end of the channel 9, and then add lubricating oil. After the filling is completed, the sealing ring 7 is rotated again so that the oil filling port 8 is staggered with channel 9 to achieve sealing of the internal lubricating oil, thereby achieving the advantages of simple operation and good sealing performance of the device. At the same time, the sealing stability of the lubricating oil during operation is better, and the stability of the device is improved. It solves the problem that the double-lip sealing ring in the prior art is generally provided with a refueling hole for the convenience of adding lubricating oil, and the refueling hole needs to be sealed when the equipment is working, which leads to the risk of the hole sealing structure falling off during continuous high-pressure operation. Once it falls off, the internal lubricating oil will quickly leak through the refueling hole under high pressure, which reduces the stability of the device.

[0024] See also Figure 3 , wherein: one end of the channel 9 is connected to the inside of the V-shaped groove 3, and the other end of the channel 9 extends to the inside of the convex ring groove 6 and is connected and matched with the oil filling port 8.

[0025] In the present invention, the inward end of the channel 9 is connected to the interior of the V-shaped groove 3, so that the lubricating oil is located between the two inner lips 2 after being injected, so that the lubricating oil film is better preserved, the storage time is longer, and the use stability is better.

[0026] See also Figure 2 and Figure 4 , wherein: a metal ring 10 is fixedly connected to the inside of the sealing ring body 1.

[0027] In the present invention, the anti-twisting deformation capability of the sealing ring body 1 is enhanced by the metal ring 10, so that the high temperature and high pressure performance of the device is better and the use is more stable.

[0028] See also Figure 2 and Figure 4 , wherein: the inside of the V-shaped groove 3 is fixedly connected with an annularly distributed rubber block 31.

[0029] In the present invention, the upper and lower inner lips 2 of the V-shaped groove 3 are reinforced by the rubber block 31, so that the sealing stability is better.

[0030] See also Figure 1 and Figure 2 , wherein: the outer side surfaces of the two outer lips 4 are arc-shaped.

[0031] In the present invention, the outer side surfaces of the two outer lips 4 are arc-shaped, which makes it more convenient to clamp with the guide sleeve during installation, thereby facilitating installation.

[0032] See also Figure 2 , wherein: the two inner lips 2 correspond horizontally to the two outer lips 4 respectively, and the inner side cross-section of the inner lip 2 is V-shaped.

[0033] In the present invention, the two inner lips 2 correspond horizontally to the two outer lips 4 respectively, so as to achieve internal and external support balance and improve the sealing effect. In addition, the V-shaped inner lip 2 has a better contact sealing effect with the piston column.

[0034] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A double-lip dustproof seal ring, comprising a seal ring body (1), characterized in that: The sealing ring body (1) is provided with two vertically arranged inner lips (2) inside, a V-shaped groove (3) is provided between the two inner lips (2), the outer side of the sealing ring body (1) is provided with two outer lips (4), a clamping groove (5) is provided between the two outer lips (4), a convex ring groove (6) is provided on the top of the sealing ring body (1), a sealing ring (7) rotatable in the groove is provided inside the convex ring groove (6), an oil filling port (8) is fixedly installed on the sealing ring (7), and a channel (9) cooperating with the oil filling port (8) is provided inside the sealing ring body (1).

2. A double-lip dustproof seal according to claim 1, characterized in that: One inward end of the channel (9) is in communication with the interior of the V-shaped groove (3), and the other end of the channel (9) extends to the interior of the convex ring groove (6) and is in communication with the oil filling port (8).

3. The double-lip dustproof seal according to claim 1, characterized in that: A metal ring (10) is fixedly connected to the interior of the sealing ring body (1).

4. The double-lip dustproof seal according to claim 1, characterized in that: An annularly distributed rubber block (31) is fixedly connected to the interior of the V-shaped groove (3).

5. The double-lip dustproof seal according to claim 1, characterized in that: The outer side surfaces of the two outer lips (4) are arc-shaped.

6. The double-lip dustproof seal according to claim 1, characterized in that: The two inner lips (2) correspond horizontally to the two outer lips (4), respectively, and the inner side cross-section of the inner lips (2) is V-shaped.

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