CN2597767Y

CN2597767Y - Underwater rotary sealer

Info

Publication number: CN2597767Y
Application number: CNU032355130U
Authority: CN
Inventors: 忠李; 李忠; 唐四喜; 冯应锋
Original assignee: 717th Research Institute of CSIC
Current assignee: 717th Research Institute of CSIC
Priority date: 2003-02-19
Filing date: 2003-02-19
Publication date: 2004-01-07
Anticipated expiration: 2013-02-19

Abstract

The utility model relates to a turning sealed device which is suitable for using at underwater environment in particular to deep sea environment, which comprises a shell and a drive device arranged in the shell. The dive device is connected with the principle bearing; the output end of the principal bearing holds out the shell and is provided with a sealed rotating ring, the sealed rotating ring is matched with the sealed stationary ring which is arranged at the shell, to form a rotation sealed device. The differences of the utility model are that the shell is filled with the insulated oil, and the shell is matched with a pressure dynamic compensation device. Due to the pressure difference of the inside and the outside of the rotation sealed device, and can keep basically constant, therefore when turn, the friction moment and the fluctuation of the utility model is reduced, so as to make the rotation sealed device possible to bear the larger pressure from sea water and deep water; and can effectively avoid the sea water etc. to enter into the shell when the sealing segment appears leaking.

Description

Rotary seal under water

Technical field

The utility model relates to the rotary seal that uses under a kind of being suitable under water, particularly abyssal environment, and it can tolerate deep-water pressure, realizes the accurate servocontrol of rotating.

Background technique

The rotary seal of abyssal environment mostly adopts the packing box seal structure at present; its groundwork mechanism is the increase along with seawater pressure; it is snugly tight further along the outer wall of rotatingshaft to be used for two rubber band rings of gland sealed, thereby keeps sealing, prevents that seawater from infiltrating.The shortcoming of this sealing configuration is that sealing effect is relatively poor, and the seawater leakage rate is bigger, and the friction torque of its rotation changes fluctuation greatly with the depth of water.The type seal arrangement generally is applied in the bathyscaph by artificial manual control, on rotating position or the less demanding turning round equipment of rotating speed control accuracy, must set up water container and emergent seal arrangement simultaneously.Rotary seal under the abyssal environment adopts mechanical seal structure in addition; it utilizes the elastic force of counterbalance spring to produce first closure power; the end face of the end face of rotating ring being close to stationary ring; under the effect of pressure fluid; end face forms the semi-fluid friction state between the rotating ring of slide relative and stationary ring; prevent the obvious leakage of pressure fluid, to realize the radially rotary seal of seal face.It is better that this structure and packing seal ring structure are compared its sealing effect, leakage rate is less, but be subjected to the influence of the variation of depth of water pressure reduction, the fluctuation of resisting moment was still bigger when it rotated, be difficult to satisfy and accurately rotate servo requirement, the type seal arrangement generally is applied on the Powerpush Unit of the latent device in sea.

Summary of the invention

Technical problem to be solved in the utility model is to provide a kind of energy to satisfy the accurate rotary seal under water that rotates servo requirement, and it is not only simple in structure, and sealing is reliable, and withstand voltage properties is good, and moment of rotation and fluctuation thereof are little.

The utility model is that the technological scheme that technical problem adopted of the above-mentioned proposition of solution is: include casing 12 and the drive unit that is installed in the casing, drive unit and main shaft link, the output terminal of main shaft stretches out casing and is provided with sealing rotating ring 14, sealing rotating ring and stationary seal ring 15 phase configuration that are installed on the casing, constitute rotating sealing device 1, its difference is to be full of in casing insulating oil, also disposes pressure dynamic compensation mechanism 9 on the casing.In the such scheme, described pressure dynamic compensation mechanism can be made of elastic bellows 19 and counterbalance spring 20, the inboard of bellows communicates with chassis cavity, the outside and the conducting of ambient pressure medium, acting in conjunction by ambient pressure and counterbalance spring power makes chassis cavity insulating oil pressure be higher than extraneous hydraulic pressure all the time, and keeps the substantially constant of inside and outside differential pressure.

The beneficial effects of the utility model are: 1, because the pressure reduction inside and outside the rotating sealing device is little, be generally 0.05～0.1Mpa, and can keep substantially constant, this not only helps improving sealability, make the pressure-bearing design grade of the motive sealing link of mechanical seal device realization descend tens times, and since when rotating friction torque and fluctuation thereof diminish, can fully satisfy accurate requirement of rotating servocontrol: 2 to moment of rotation, inside and outside differential pressure is little also to make the designing requirement of casing rigidity reduce greatly, help reducing housing physical dimension and mitigation system weight, and make rotary seal bear higher seawater deep-water pressure to become possibility; 3, because chassis cavity is full of insulating oil, chassis cavity pressure is greater than ambient pressure environment, when the sealing part partial failure causes seepage, only show as leaking of chassis cavity insulating oil, hazardous medium such as seawater entered casing in the time of so both can effectively having avoided a small amount of seepage of sealing part, damage the electric device in the casing, fill insulating oil in the while and also help lubricating rotatable parts.

Description of drawings

Fig. 1 is an embodiment's of the utility model a positive sectional structure chart.

Fig. 2 is the partial enlarged drawing of rotary seal part among Fig. 1.

Fig. 3 is the partial enlarged drawing of pressure dynamic compensation mechanism part among Fig. 1.

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is further described, include a casing 12, be supported with main shaft 2 by bearing 3,4 in the casing, main shaft can be hollow spindle, main shaft periphery disposes drive unit, drive unit is a brushless torque motor 5, constitute by the stator that links with casing with rotor that main shaft links, top at main shaft also is installed on the angle measurement element, measuring cell can be rotary transformer 6, to be used for the mensuration of accurate corner, the bottom is installed on laminated conductive retractor collar 7 in the casing, and is matched with the conducting cable; Casing is stretched out on the top of main shaft, with be driven parts and join, the rear end of its extension is installed on end face seal rotating ring 14, the periphery of end face seal rotating ring is provided with seal ring 17 and links to each other with main shaft, to guarantee the sealing of outer ring surface b, the rear end of end face seal rotating ring is evenly equipped with a plurality of thrust springs 13, the front end of end face seal rotating ring and end face seal stationary ring 15 phase configuration that are installed in casing axis hole end, the end face seal stationary ring links to each other with the casing axis hole by seal ring 16, be used for the sealing of outer ring surface c, end face seal rotating ring its front-end face and stationary seal ring end face under the effect of thrust spring 13 fit tightly, thrust spring also plays the effect of regulating compensation sealing ring end wear simultaneously, under the effect of pressure fluid, makes the slip end face be in the semi-fluid friction state, realize radial end face a rotary seal, constitute rotating sealing device 1 thus.In addition, chassis cavity is full of insulating oil 8, and is equipped with the cable 10 that is conducted with electric elements, and cable joins for the withstand voltage cable of sealing, the watertight cable socket 11 outer with being installed in casing; Also be installed on a pressure dynamic compensation mechanism 9 in the lower end of casing, pressure dynamic compensation mechanism includes elastic bellows 19 and counterbalance spring 20, elastic bellows can be made by thin-wall stainless steel, the end plate of its top is provided with screw and regulator bolts 22 joins, suit counterbalance spring 20 on the regulator bolts, provide predeformation that insulating oil is filled to chassis cavity for elastic bellows and counterbalance spring by regulating regulator bolts 22, the inboard of elastic bellows (periphery) communicates with the inner chamber of airtight casing, the outside (endoporus) and extraneous conducting, bear extraneous hydraulic pressure, unclamp nut 21, elastic bellows and counterbalance spring provide a precompression about 0.1MPa for jointly the insulating oil of chassis cavity, elastic corrugated tube end sheet periphery also with casing in backstop position phase configuration, to control its maximal dilation amount, one differential pressure pickup 18 also can be set, so that the pressure reduction inside and outside the casing is monitored and reported to the police in casing or on the elastic corrugated tube end sheet.

Claims

1, a kind of rotary seal under water, include casing (12) and be installed in drive unit in the casing, drive unit and main shaft link, the output terminal of main shaft stretches out casing and is provided with sealing rotating ring (14), sealing rotating ring and stationary seal ring (15) phase configuration that is installed on the casing, constitute rotating sealing device (1), it is characterized in that in casing, being full of insulating oil is arranged, also dispose pressure dynamic compensation mechanism (9) on the casing.

2, by the described rotary seal under water of claim 1, it is characterized in that described pressure dynamic compensation mechanism can be by elastic bellows (19) and counterbalance spring (20) formation, the inboard of bellows communicates with chassis cavity, the outside and the conducting of ambient pressure medium.

3, by claim 1 or 2 described rotary seals under water, it is characterized in that being supported with main shaft (2) by bearing (3), (4) in the casing, main shaft is a hollow spindle.

4, by claim 1 or 2 described rotary seals under water, it is characterized in that main shaft periphery disposes drive unit, drive unit is brushless torque motor (5), constitutes by the stator that links with casing with rotor that main shaft links.

5, by the described rotary seal under water of claim 4, it is characterized in that also being installed on the angle measurement element on the top of main shaft.

6, by the described rotary seal under water of claim 4, it is characterized in that the bottom is installed on laminated conductive retractor collar 7 in the casing, matched with the conducting cable.

7, by claim 1 or 2 described rotary seals under water, the rear end that it is characterized in that the main shaft extension is installed on end face seal rotating ring (14), the periphery of end face seal rotating ring is provided with seal ring (17) and links to each other with main shaft, the rear end of end face seal rotating ring is evenly equipped with a plurality of thrust springs (13), the front end of end face seal rotating ring and end face seal stationary ring (15) phase configuration that is installed in casing axis hole end, the end face seal stationary ring links to each other with the casing axis hole by seal ring (16).

8, by the described rotary seal under water of claim 2, it is characterized in that elastic bellows (19) made by thin-wall stainless steel, the end plate of its top is provided with screw and regulator bolts (22) joins, suit counterbalance spring (20) on the regulator bolts.

9,, it is characterized in that in casing or a differential pressure pickup (18) also can be set on the elastic corrugated tube end sheet by claim 1 or 8 described rotary seals under water.