CN115638250A - Shield main drive sealing system for high-pressure environment - Google Patents
Shield main drive sealing system for high-pressure environment Download PDFInfo
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- CN115638250A CN115638250A CN202211164425.7A CN202211164425A CN115638250A CN 115638250 A CN115638250 A CN 115638250A CN 202211164425 A CN202211164425 A CN 202211164425A CN 115638250 A CN115638250 A CN 115638250A
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- 238000007789 sealing Methods 0.000 title claims abstract description 54
- 239000010687 lubricating oil Substances 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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Abstract
The invention relates to a shield main driving sealing system for a high-pressure environment, which comprises a bearing fixing frame, a rotating frame, a main bearing, a lip-shaped sealing ring and a floating piston rod, wherein the bearing fixing frame is sleeved outside the rotating frame, a bearing inner pressure cavity is arranged between the bearing fixing frame and the rotating frame, lubricating oil is filled in the bearing inner pressure cavity, the main bearing and the lip-shaped sealing ring are both positioned between the bearing fixing frame and the rotating frame, one end of the floating piston rod extends to the pressure cavity of a cutter head cabin, the other end of the floating piston rod extends into the bearing inner pressure cavity, and the rotating frame and the main bearing are respectively matched with the floating piston rod in a sliding sealing manner through an O-shaped sealing ring; the floating piston rod movably extrudes lubricating oil in the pressure cavity in the bearing under the high-pressure environment, so that the pressure of the pressure cavity in the bearing is increased to balance the internal pressure and the external pressure, the lip-shaped sealing ring is prevented from being impacted and failed by a large load under the high-pressure environment, the reliability of the lip-shaped sealing ring is ensured, and the service life of the lip-shaped sealing ring is prolonged.
Description
Technical Field
The invention relates to the technical field of tunneling equipment, in particular to a shield main driving sealing system used in a high-pressure environment.
Background
The tunnel boring machine is important equipment for building a tunnel, and has higher requirements on the sealing performance of the tunnel boring machine in the process; the main driving seal of the tunnel boring machine is one of important guarantees for safe and reliable work of the tunnel boring machine, if the main driving seal fails, equipment is damaged slightly, and engineering accidents are caused seriously.
Traditional tunnel boring machine owner drives sealedly uses through lip rubber seal and sealed oil blanket cooperation, and the biggest ability realizes sealedly under 0.9Mpa pressure, but when building big buried depth tunnel under water, needs the sealed maximum pressure that can bear of main drive to reach 1.9Mpa, if adopts traditional main drive sealing mode, leans on the quantity that increases lip seal or improves the sealing washer material simply, hardly ensures that main drive is sealed reliably effectively.
Disclosure of Invention
The invention aims to provide a shield main driving sealing system for a high-pressure environment, which can solve the problem that the traditional main driving seal is easy to lose sealing effectiveness in the high-pressure environment.
The invention provides the following technical scheme: a shield main drive sealing system used in a high-pressure environment comprises a bearing fixing frame, a rotating frame, a main bearing and a lip-shaped sealing ring, wherein the bearing fixing frame is used for being connected with a speed reducer shell, the rotating frame is used for being connected with an output end of a speed reducer, the bearing fixing frame is sleeved on the outer side of the rotating frame, a pressure cavity in the bearing is arranged between the bearing fixing frame and the rotating frame, lubricating oil is filled in the pressure cavity in the bearing, the main bearing and the lip-shaped sealing ring are both positioned between the bearing fixing frame and the rotating frame, the main bearing is used for rotatably connecting the bearing fixing frame and the rotating frame, and the lip-shaped sealing ring is positioned on one side, facing a cutter head pressure cavity, of the main bearing and used for keeping the pressure cavity in the bearing sealed;
the rotary frame and the main bearing are respectively matched with the floating piston rod in a sliding sealing manner through an O-shaped sealing ring; and one end of the floating piston rod, which extends into the pressure cavity in the bearing, is coaxially provided with a thrust shaft shoulder, and the thrust shaft shoulder is a circular plate with the outer diameter larger than that of the floating piston rod.
Has the advantages that: when the shield main driving sealing system for the high-pressure environment works, the speed reducer drives the rotating frame to rotate, the main bearing is used for supporting the rotating frame to rotate relative to the bearing fixing frame, when the pressure of the pressure cavity of the cutter head cabin is greater than the pressure of the pressure cavity in the bearing, the floating piston rod moves towards the pressure cavity in the bearing under the action of the internal and external pressure difference to extrude lubricating oil in the pressure cavity in the bearing, and the compression ratio based on the lubricating oil is small, the pressure of the lubricating oil in the bearing cavity is rapidly increased until the pressure of the pressure cavity in the bearing and the pressure of the pressure cavity in the cutter chamber reach dynamic balance, and under the pressure regulation action of the floating piston rod, the pressures of the inner side and the outer side of the lip-shaped sealing ring are dynamically consistent, so that the lip-shaped sealing ring cannot be impacted by a large load due to external pressure change, the reliability and the effectiveness of main drive sealing are guaranteed, and the durability and the reliability of the main drive sealing drive used in a high-pressure environment can be improved; the floating piston rod is provided with a thrust shaft shoulder, so that the floating piston rod can be prevented from being separated from the rotating frame to enter the cutter head cabin under the condition of reducing external pressure, and the sliding connection relation between the floating piston rod and the rotating frame as well as the sliding connection relation between the floating piston rod and the main bearing can be ensured.
Furthermore, conical nails are respectively arranged on two sides of the leg stopping shaft shoulder.
Has the beneficial effects that: the conical nail is arranged, so that the thrust shaft shoulder is not attached to the inner side face of the bearing, and the side, provided with the annular face, of the thrust shaft shoulder is kept in an effective stress state.
Furthermore, four floating piston rods are arranged and are uniformly distributed on the rotating frame along the circumferential direction.
Has the advantages that: the four floating piston rods are matched for use, and the pressure cavity in the bearing can make timely and sensitive reaction when the pressure at different positions of the pressure cavity of the external cutter head cabin changes.
Further, the rotating frame comprises a main rotating frame and an inner sealing ring fixed on the outer side of the main rotating frame through screws, and the lip-shaped sealing ring is installed on the outer side of the inner sealing ring and in contact friction fit with the inner sealing ring.
Has the advantages that: the position, which is used for being in friction fit with the lip-shaped sealing ring, on the outer side of the rotating frame needs to be processed with high precision, and the rotating frame adopts a split structure of a main rotating frame and an inner sealing ring, so that the processing difficulty and the processing cost of the whole rotating frame are reduced while the precision of a friction contact surface is ensured.
Furthermore, a protective sleeve is arranged on the outer side of one end, extending to the pressure cavity of the cutter disc cabin, of the floating piston rod.
Has the beneficial effects that: in the shield tunneling process, the protective sleeve can effectively prevent stones in the cutter head cabin from impacting or sand in the cutter head rotating process from wearing the floating piston rod.
Drawings
FIG. 1 is a partial structural cross-sectional view of a shield primary drive seal system of an embodiment 1 of the present invention for use in a high pressure environment (the cutter head compartment pressure chamber is shown at U);
FIG. 2 is a schematic diagram of the pressure action of a floating piston rod in an embodiment 1 of the shield main drive sealing system for high-pressure environment of the present invention (P1 represents the pressure cavity pressure in the cutterhead compartment, and P2 represents the pressure cavity pressure in the bearing);
FIG. 3 is a partial structural cross-sectional view of an embodiment 2 of the shield primary drive seal system of the present invention for use in a high pressure environment;
reference numerals are as follows: 1-a speed reducer; 2-bearing fixing frame; 3-a main bearing; 4-lip-shaped sealing ring; 5-a rotating frame; 51-a main turret; 52-inner sealing ring; 6-a floating piston rod; 7-thrust shaft shoulder; 8-taper type nail; 9-protective sleeve; 10-O type sealing ring; 11-a retaining roller; 12-a radial roller; 13-a pusher roller; 14-pressure chamber inside the bearing.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The invention relates to a shield main driving sealing system used in high-pressure environment, which comprises the following specific embodiments:
the invention provides a shield main driving sealing system for a high-pressure environment, which is structurally shown in figure 1 and mainly comprises a bearing fixing frame 2, a main bearing 3, a lip-shaped sealing ring 4, a rotating frame 5 and a floating piston rod 6, wherein the bearing fixing frame 2 is fixedly connected with a shell of a reducer 1 of the shield when in use, and the rotating frame 5 is arranged at the output end of the reducer 1 of the shield and can be driven to rotate by the reducer 1. A bearing inner pressure cavity 14 filled with lubricating oil is arranged between the rotating frame 5 and the bearing fixing frame 2, a main bearing 3 which is connected between one end of the rotating frame 5 close to the speed reducer 1 and the bearing fixing frame 2 and used for supporting the rotating frame 5 to rotate is arranged in the bearing inner pressure cavity 14, and the main bearing 3 comprises an inner ring, an outer ring, a retaining roller 11, a radial roller 12 and a pushing roller 13, wherein the retaining roller 11, the radial roller 12 and the pushing roller are arranged between the inner ring and the outer ring in a rolling mode. The lip-shaped sealing ring 4 is arranged between the rotating frame 5 and the bearing fixing frame 2 and is positioned on one side of the main bearing 3 facing the cutter head cabin pressure cavity U in the axial direction for keeping the bearing inner pressure cavity 14 sealed; the lip seal 4 bears pressure from the pressure chamber U of the cutter head chamber and the pressure chamber 14 in the bearing on the inner and outer sides.
Four floating piston rods 6 are uniformly distributed along the circumferential direction, the floating piston rods 6 penetrate through the rotating frame 5 and the inner ring of the main bearing 3, the inner ends of the floating piston rods penetrate into the bearing inner pressure cavity 14, and the outer ends of the floating piston rods penetrate into the cutter head cabin pressure cavity U. The interior of the turret 5 and the main bearing 3 are provided with a plurality of O-rings 10 for maintaining a sliding sealing engagement with the floating piston rod 6. The inner end of the floating piston rod 6 is provided with a thrust shaft shoulder 7 with the outer diameter larger than that of the floating piston rod 6, the thrust shaft shoulder 7 is a circular plate coaxially arranged with the floating piston rod 6, and in order to prevent one side face, facing the main bearing, of the thrust shaft shoulder 7 from being attached to the inner ring of the main bearing and being incapable of stably bearing, two sides of the thrust shaft shoulder 7 are provided with tapered nails 8.
The pressure adaptive float regulation process of the present invention is described below based on a high pressure environment:
as shown in fig. 2, P1 represents the pressure of the pressure chamber of the cutter head compartment, a is the stress area of the outer end of the floating piston rod (i.e. the stress area of the end of the floating piston rod extending to the pressure chamber of the cutter head compartment), P2 represents the pressure of the pressure chamber in the bearing, and A2 represents the circular stress area of the thrust shoulder on the side back to the main bearing; a1 represents the annular force-bearing area of the thrust shoulder on the side facing the main bearing, and a = A2-A1, and in the case of balanced internal and external pressures, the force-bearing model of the floating piston rod is as follows: p2 × A2-P2 × A1= P1 × a. Based on above model, face high pressure environment, P1 is great, and the outer end atress of floating piston rod is great, promotes floating piston rod and moves extrusion lubricating oil to bearing internal pressure chamber one side, leads to P2 to increase rapidly, and until P2 and P1 form dynamic balance, under this condition, lip seal can not arouse great load impact because of high pressure environment, guarantees its durability and reliability.
By combining the floating adjustment process, the invention fully utilizes the properties of pressure difference balance and small lubricating oil compression ratio, and the pressure value of the pressure cavity in the bearing is quickly adjusted in the process that the floating piston rod slides under stress, so that the pressure of the pressure cavity in the bearing and the pressure of the pressure cavity in an external cutter head cabin reach a balanced state, the reaction is sensitive, the speed is high, the phenomenon that the pressure of the cutter head cabin rises to form large-load impact on the lip-shaped sealing ring can be effectively avoided, the sealing performance of the lip-shaped sealing ring is ensured, and the problem that the traditional main driving seal fails in a high-pressure environment is solved.
The specific embodiment 2 of the shield main driving sealing system used in the high-pressure environment of the invention:
the difference from the embodiment 1 is that, as shown in fig. 3, the outer end of the floating piston rod is provided with a protective sleeve 9 for preventing muddy water and stone from damaging the floating piston rod.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (5)
1. A shield main drive sealing system for a high-pressure environment is characterized by comprising a bearing fixing frame, a rotating frame, a main bearing and a lip-shaped sealing ring, wherein the bearing fixing frame is used for being connected with a speed reducer shell, the rotating frame is used for being connected with an output end of a speed reducer, the bearing fixing frame is sleeved on the outer side of the rotating frame, a pressure cavity in the bearing is arranged between the bearing fixing frame and the rotating frame, lubricating oil is filled in the pressure cavity in the bearing, the main bearing and the lip-shaped sealing ring are both positioned between the bearing fixing frame and the rotating frame, the main bearing is used for rotatably connecting the bearing fixing frame and the rotating frame, and the lip-shaped sealing ring is positioned on one side, facing a pressure cavity of a cutter head cabin, of the main bearing and used for keeping the pressure cavity in the bearing sealed;
the rotary frame and the main bearing are respectively matched with the floating piston rod in a sliding sealing manner through an O-shaped sealing ring; and one end of the floating piston rod, which extends into the pressure cavity in the bearing, is coaxially provided with a thrust shaft shoulder, and the thrust shaft shoulder is a circular plate with the outer diameter larger than that of the floating piston rod.
2. The shield main drive seal system for high pressure environment of claim 1 wherein tapered nails are mounted on either side of said leg stop shoulders.
3. The shield main drive sealing system for high pressure environment of claim 1 or 2, wherein there are four floating piston rods, and four floating piston rods are uniformly distributed on the rotating frame along the circumferential direction.
4. A shield primary drive seal system for use in a high pressure environment according to claim 1 or claim 2 wherein the turret includes a primary turret and an inner seal ring secured by screws to the outside of the primary turret, the lip seal being mounted on the outside of the inner seal ring in contacting friction fit therewith.
5. The shield main driving sealing system for the high-pressure environment as claimed in claim 1 or 2, wherein a protective sleeve is arranged outside one end of the floating piston rod, which extends to the pressure chamber of the cutter head cabin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211164425.7A CN115638250A (en) | 2022-09-23 | 2022-09-23 | Shield main drive sealing system for high-pressure environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211164425.7A CN115638250A (en) | 2022-09-23 | 2022-09-23 | Shield main drive sealing system for high-pressure environment |
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| Publication Number | Publication Date |
|---|---|
| CN115638250A true CN115638250A (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211164425.7A Pending CN115638250A (en) | 2022-09-23 | 2022-09-23 | Shield main drive sealing system for high-pressure environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118517526A (en) * | 2024-07-23 | 2024-08-20 | 洛阳开创车桥有限公司 | Steering drive axle sealing structure under reciprocating and rotating compound motion and mounting method |
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2022
- 2022-09-23 CN CN202211164425.7A patent/CN115638250A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118517526A (en) * | 2024-07-23 | 2024-08-20 | 洛阳开创车桥有限公司 | Steering drive axle sealing structure under reciprocating and rotating compound motion and mounting method |
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Inventor after: Wang Yawen Inventor after: Zhu Xiaolong Inventor after: Yan Jinrui Inventor after: Guo Lu Inventor after: Han Weifeng Inventor after: Yang Guang Inventor after: Li Dawei Inventor after: Cai Jun Inventor after: Wang Junjie Inventor after: Liu Jiajun Inventor after: Dai Yong Inventor before: Han Weifeng Inventor before: Zhu Xiaolong Inventor before: Yan Jinrui Inventor before: Guo Lu Inventor before: Wang Yawen Inventor before: Yang Guang Inventor before: Li Dawei Inventor before: Cai Jun Inventor before: Wang Junjie Inventor before: Liu Jiajun Inventor before: Dai Yong |