Emergency sealing combination device

Abstract

The utility model relates to an emergency sealing combination device which comprises framework oil seals, bowl-shaped seals, a sealing shell, a liquid level sensor and a pneumatic control box, the framework oil seals and the bowl-shaped seals are installed on a transmission shaft in a groove of the sealing shell, the lip direction of the framework oil seals faces the medium direction, the liquid level sensor is connected with the pneumatic control box, and the pneumatic control box is connected with the bowl-shaped seals. The pneumatic control box is communicated with the inflation cavity above the bowl-shaped seal, and the pneumatic control box is inflated to enable the bowl-shaped seal to deform and be attached to the transmission shaft. According to the emergency sealing combination device, an external medium can be blocked in time after an outer framework oil seal fails, meanwhile, the transmission shaft can still rotate, it is guaranteed that large equipment can still operate normally within a certain period of time, and the large equipment can be effectively managed and controlled. According to the emergency sealing device, leakage accidents can be effectively prevented, and multi-aspect high cost losses caused by emergency shutdown maintenance and equipment replacement cycle are greatly avoided.

Description

Technical Field

[0001] The utility model relates to the field of oil seals, in particular to an emergency sealing assembly device. Background Art

[0002] In large-scale equipment such as hydroelectric main shafts, ship propulsion systems, and shield main drives, traditional emergency sealing devices typically utilize multiple sets of skeleton oil seals and airbags to form a combined seal, sealing off water or oil on the outside. If the skeleton oil seal suddenly fails, the airbag is inflated to temporarily provide a seal. However, in the event of a sudden, adverse operating condition or skeleton seal failure, leaks can only be detected through regular visual inspection by on-site personnel, which can delay detection and potentially lead to further losses. When a seal failure is detected, the airbag must be manually inflated. The high-pressure expansion and deformation of the airbag fills the entire seal housing, tightening the drive shaft to prevent any leakage. However, this requires the large equipment to be shut down. Continued rotation of the drive shaft could pull the airbag seal out, rendering it ineffective and causing further leakage. Clearly, this traditional airbag emergency sealing device is difficult to detect when a seal failure occurs. Once a leak occurs, only emergency inflation is allowed to seal the medium while the equipment is shut down for repair, resulting in limited operability and control. Utility Model Content

[0003] In order to solve the technical problems existing in the prior art, the utility model provides a practical and reliable emergency sealing combination device.

[0004] In order to achieve the above object, the technical solution of the utility model is as follows:

[0005] An emergency sealing assembly device includes a skeleton oil seal, a bowl-shaped seal, a sealing housing, a liquid level sensor, and a pneumatic control box. Multiple skeleton oil seals and bowl-shaped seals are installed on a transmission shaft in a sealing housing groove, with the lip of the skeleton oil seal facing the medium. The liquid level sensor is connected to the pneumatic control box, which is connected to the inflation cavity above the bowl-shaped seal. The pneumatic control box is inflated to deform the bowl-shaped seal and fit the transmission shaft.

[0006] As a preferred technical solution, the pneumatic control box includes a control box, an air pump, a pressure reducing valve and a solenoid valve. The air pump and the inflation cavity are connected through an air intake channel arranged on the sealed shell. The pressure reducing valve and the solenoid valve are arranged on the air intake channel. The liquid level sensor, air pump, pressure reducing valve and solenoid valve are all connected to the control box.

[0007] As a preferred technical solution, sealing protrusions are provided on both side ends and both ends of the radial inner surface of the bowl-shaped seal.

[0008] As a preferred technical solution, the main body material of the bowl-shaped seal is rubber, and the protrusions are embedded in the main body using cloth-reinforced rubber or polytetrafluoroethylene.

[0009] As a preferred technical solution, a sealing baffle and a bowl-shaped sealing plate are respectively provided on the outer sides of the skeleton oil seal and the bowl-shaped seal.

[0010] As a preferred technical solution, when the bowl seal is in a non-working state, a gap is left between the inner side of the bowl seal and the drive shaft. When the skeleton oil seal fails, the liquid level sensor detects the inflow of medium and transmits an alarm signal to the pneumatic control box. The pneumatic control box drives the bowl seal to deform and be squeezed onto the drive shaft.

[0011] As an optimal technical solution, when the outer seal leakage is repaired, the liquid level sensor releases the alarm, the pneumatic control box closes the solenoid valve and the pressure reducing valve, the inflation chamber is exhausted through the air inlet channel, and the bowl-shaped seal pushes the seal away from the drive shaft surface by its own elastic force.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model's emergency seal assembly automatically detects internal leaks. When failure of the external skeleton oil seal is detected, the leak is promptly detected. The emergency seal deforms and expands within a short period of time, tightening the rotating shaft to seal the external leaking medium. This ensures that the equipment can continue to operate normally for a certain period of time, minimizing losses caused by emergency shutdowns of large equipment and preventing ships and other equipment from becoming stranded and requiring repairs. Currently, the emergency seal assembly can be designed in a non-standard manner according to site requirements, meeting the requirements for rotating shaft diameters ranging from 150 to 4000 mm, linear speeds up to 2 m / s, and single-sided eccentricity up to 2 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of the emergency sealing assembly device of the present utility model;

[0015] Figure 2 This is a schematic diagram of the emergency sealing assembly device of the present invention in a non-working state;

[0016] Figure 3 It is a schematic diagram of the working state of the emergency sealing combination device of the present invention.

[0017] In the figure: 1. Sealing baffle; 2. Skeleton oil seal; 3. Sealing housing; 4. Liquid level sensor; 5. Pneumatic control box; 6. Air intake channel; 7. Inflatable chamber; 8. Bowl seal; 9. Bowl sealing plate; 10. Drive shaft. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below in conjunction with specific embodiments:

[0019] like Figure 1As shown, an emergency sealing assembly device includes a skeleton oil seal 2, a bowl-shaped seal 8, a sealing housing 3, a liquid level sensor 4, and a pneumatic control box 5. Multiple skeleton oil seals 2 and bowl-shaped seals 8 are installed on a transmission shaft 10 in a groove of the sealing housing 3. The lip direction of the skeleton oil seal 2 faces the medium direction. The liquid level sensor 4 is connected to the pneumatic control box 5. The pneumatic control box 5 is connected to the inflation cavity 7 above the bowl-shaped seal 8. The pneumatic control box 5 is inflated to deform the bowl-shaped seal 8 and fit the transmission shaft 10.

[0020] The pneumatic control box 5 includes a control box, an air pump, a pressure reducing valve and a solenoid valve. The air pump and the inflation cavity 7 are connected through an air intake channel 6 arranged on the sealed shell 3. The pressure reducing valve and the solenoid valve are arranged on the air intake channel 6. The liquid level sensor 4, the air pump, the pressure reducing valve and the solenoid valve are all connected to the control box.

[0021] like Figure 3 As shown, the bowl-shaped seal 8 is provided with sealing protrusions on both ends and both ends of the radial inner surface. The protrusions on the two end surfaces of the bowl-shaped seal 8 are a and b, while the radial inner surface includes at least two sealing protrusions c and d. This type of protrusion structure can provide a large amount of compression deformation in the local area of the seal, thereby significantly improving sealing performance.

[0022] The bowl-shaped seal 8 is made of rubber material, and according to the working conditions, nitrile rubber, fluorine rubber, chloroprene rubber, silicone rubber, hydrogenated nitrile rubber, polyurethane, etc. are optional. The sealing convex points on both sides and the inner surface adopt a nesting process, and are preferably made of cloth-reinforced rubber material or wear-resistant materials such as polytetrafluoroethylene.

[0023] The outer sides of the skeleton oil seal 2 and the bowl-shaped seal 8 are pressed by the sealing baffle 1 and the bowl-shaped sealing plate 9 respectively.

[0024] like Figure 2 As shown, when the device is in the non-operating state, there is a gap between the inner side of the bowl seal 8 and the transmission shaft 10, and the two are not in contact. When the skeleton oil seal 2 fails, the medium flows into the cavity of the liquid level sensor 4, triggering the liquid level sensor 4 to alarm, which can quickly detect the leakage. At the same time, the pneumatic control box 5 quickly opens the internal solenoid valve and pressure reducing valve after receiving the signal, and starts the inflation pump to inflate. The high-pressure gas quickly fills the inflation chamber through the air inlet channel 6, and the inflation chamber tends to expand. Figure 3 As shown, the radial annular cavity of the bowl-shaped seal 8 is squeezed onto the transmission shaft 10, and the device changes from a non-working state to a working state. The convex points c and d on the inner side of the bowl-shaped seal 8 are in direct contact with the transmission shaft 10. Due to the increase in the pressure in the cavity, the convex points a and b on both sides of the bowl-shaped seal 8 are tightly pressed against the inner walls on both sides of the cavity, thereby ensuring the sealing of the two sides and the radial inner surface of the bowl-shaped seal 8, and the medium will not leak from the inflation chamber, thereby improving the overall safety of the seal.

[0025] The design of the inflatable chamber in this device controls the deformation of bowl seal 8. The pressure exerted by the gas on the radial surface presses the radial inner surface of bowl seal 8 against drive shaft 10. Even if the centerline of drive shaft 10 is slightly eccentric, sealing bumps c and d can effectively contact drive shaft 10, achieving a highly effective seal. Because sealing bumps c and d are in line contact with drive shaft 10, wear and heat generation during relative motion are minimal. This ensures continued operation of drive shaft 10 while preventing short-term damage to bowl seal 8. The dual sealing cavities formed by sealing bumps c and d also enhance sealing reliability.

[0026] Once the outer seal leak is repaired, the liquid level sensor 4 deactivates its alarm, and the pneumatic control box 5 rapidly closes the solenoid valve and pressure reducing valve, allowing the air in the chamber to be exhausted through the air inlet passage 6. When the pressure in the chamber is sufficiently reduced, the bowl seal 8, relying on its own elasticity, generates a reaction force that pushes the device away from the surface of the drive shaft 10, transitioning from an operating state to a non-operating state. This is accomplished entirely under the control of the pneumatic control box 5, without human intervention, resulting in a highly timely and convenient operation.

[0027] This utility model provides a novel emergency sealing assembly that promptly seals off external media after the failure of the outer frame oil seal 2, while allowing the drive shaft 10 to continue rotating. This ensures that large-scale equipment can continue to operate normally for a certain period of time, allowing for effective management and control of large-scale equipment. This emergency sealing assembly effectively prevents leakage accidents and significantly reduces the high costs and losses associated with emergency shutdowns for repairs and equipment replacement cycles.

[0028] This embodiment is only a further explanation of the invention and is not a limitation of the invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the invention, they are protected by patent law.

Claims

1. An emergency sealing assembly, characterized in that: It includes a skeleton oil seal, a bowl-shaped seal, a sealing shell, a liquid level sensor, and a pneumatic control box. Multiple skeleton oil seals and bowl-shaped seals are installed on the transmission shaft in the sealing shell groove. The lip direction of the skeleton oil seal faces the medium direction. The liquid level sensor is connected to the pneumatic control box, and the pneumatic control box is connected to the inflation cavity above the bowl-shaped seal. The pneumatic control box is inflated to deform the bowl-shaped seal and fit the transmission shaft.

2. The emergency sealing assembly according to claim 1, characterized in that: The pneumatic control box includes a control box, an air pump, a pressure reducing valve and a solenoid valve. The air pump is connected to the inflation cavity through an air intake channel arranged on the sealed shell. The pressure reducing valve and the solenoid valve are arranged on the air intake channel. The liquid level sensor, air pump, pressure reducing valve and solenoid valve are all connected to the control box.

3. The emergency sealing assembly according to claim 1, characterized in that: Sealing convex points are provided on both side ends and both ends of the radial inner surface of the bowl-shaped seal.

4. The emergency sealing assembly according to claim 3, characterized in that: The main body material of the bowl-shaped seal is rubber, and the sealing protrusions are made of cloth-reinforced rubber or polytetrafluoroethylene and are nested on the main body.

5. The emergency sealing assembly according to claim 1, characterized in that: The outer sides of the skeleton oil seal and the bowl-shaped seal are respectively provided with a sealing baffle and a bowl-shaped sealing plate.

6. The emergency sealing assembly according to claim 1, characterized in that: When the bowl seal is in a non-working state, a gap is left between the inner side of the bowl seal and the drive shaft. When the skeleton oil seal fails, the liquid level sensor detects the inflow of medium and transmits an alarm signal to the pneumatic control box, which drives the bowl seal to deform and be squeezed onto the drive shaft.

7. The emergency sealing assembly according to claim 1, characterized in that: When the outer seal leakage is repaired, the liquid level sensor stops the alarm, the pneumatic control box closes the solenoid valve and the pressure reducing valve, the air-filled chamber is exhausted through the air inlet channel, and the bowl-shaped seal pushes the seal away from the transmission shaft surface by its own elastic force.

Images