CN106051318A - Combined sealing signal line structure bearing external pressure - Google Patents

Abstract

The invention relates to a sealing structure. The sealing structure is composed of an O-shaped seal ring (2), an elastic sealing body (3), a pressing ring (4), a pressing nut (5) and a shell (6). Sealing is achieved through two parts, namely, the O-shaped seal ring (2) and the elastic sealing body (3). The O-shaped seal ring (2) and the elastic sealing body (3) are arranged in an unthreaded hole (7). The contact face of the elastic sealing body (3) and the O-shaped seal ring (2) is an inclined face. The roughness of the unthreaded hole is 0.8. High-hardness butyronitrile rubber is used as a sealing material.

Description

Bear the combination sealing signal line structure of external pressure

Technical field: the present invention relates to bear the combination sealing signal line structure of external pressure.

Background technology: 6000rpm frequency conversion high-speed wet type fire-proof motor is speedily carried out rescue work for colliery is permeable, and power is 600kW, voltage 6000V, vertical machine, is national science and technology supporting plan key project " colliery permeable Quick rescue drainage equipment research and development " The motor that problem is developed.Being all water outside this motor intracavity, motor casing inner chamber is clean water, is sewage outside motor casing, motor Bearing external pressure 10Mpa, the sewage outside motor casing can not enter motor, and to affect motor properly functioning, and the water in motor can not ooze out Outside motor, otherwise motor cannot be properly functioning.The water temperature holding wire that motor runs transmits signal, in order to be controlled, The inside of conventional wet type electric motor is full of water under high pressure, and motor bears intrinsic pressure, and outside is air, does not has to seal internal water, also Want sealed external water, bear the sealing structure of external pressure.The typically no requirement bearing 10Mpa external pressure of common submersible motor, also Being not necessarily wet type electric motor, in flameproof electrical apparatus, conventional clamp nut compresses elastic seal ring and carrys out hermetically-sealed cable and meet Requirement of explosion proof, but do not bear the requirement of hydraulic pressure, and this sealing structure life-time service, the aging sealing of flexible sealing ring The problem of impaired performance.

The content of invention: it is an object of the invention to provide a kind of combination sealing signal line structure bearing external pressure: ensure electricity Sewage outside machine can not enter in motor, and the water in motor can not ooze out motor cavity, seals outside structure 10Mpa to be born Pressure.The technical scheme is that 1) seal structure be made up of two seals, respectively O-ring seals (2) and elastic sealed body (3), O-ring seals (2) and elastic sealed body (3) are placed in the unthreaded hole (7) of housing (6), and elastic sealed body (3) seals with O shape Circle (2) contact surface is inclined-plane, and elastic sealed body (3) top installs pressure ring (4), clamp nut (5) successively.2) unthreaded hole (7) is thick Rugosity is 0.8, and encapsulant uses the nitrile rubber of high rigidity.

The present invention is sealed into two seals combination: elastic sealed body (3) seals and relies on tightening of nut, compression pressure ring (4), Make elastic sealed body (3) produce expanded radially while axial shortening, thus combine closely with housing (6) and holding wire (1), Produce and compress sealing function.Elastic sealed body (3) is inclined-plane with the contact surface of O-ring seals (2), when it compresses O-ring seals (2) time, O-ring seals (2) under the effect of the pressure, is pressed against the both sides that groove is vertical, and it deforms increase, with contacting of groove both sides Face increases, and plugs liquid leakage path, serves sealing function.O-ring seals (2) compressive deformation, produces elastic contact force Realizing the sealing of groove both sides, the sealability of O-ring seals (2) typically raises with the rising of pressure, has both made elastic packing Body (3) lost efficacy, and O (2) is under the effect of external pressure, and the contact force relying on elastic deformation to produce also can prevent leakage.

Operation principle of the present invention

The present invention is the sealing structure of a kind of holding wire for 6000rpm frequency conversion high-speed wet type fire-proof motor, the present invention Be sealed into two seals combination: elastic sealed body (3) seal rely on nut tighten compression pressure ring, make elastic sealed body (3) exist Produce expanded radially while axial shortening, thus combine closely with housing (6) and holding wire (1), produce and compress sealing function. This structure meets requirement of explosion proof, can well play flame proof effect, meet motor requirement of explosion proof.Elastic sealed body (3) is by compression Time also can compress O-ring seals (2), O-ring seals (2) compressive deformation, produce elastic contact force and realize sealing, O shape seals The sealability of circle (2) typically raises with the rising of pressure, and elastic sealed body (3) is oblique with the contact surface of O-ring seals (2) Face, when it compresses O-ring seals (2), O-ring seals (2) under the effect of the pressure, is pressed against the both sides that groove is vertical, and it becomes Shape is big, also increases with the contact surface of groove both sides, plugs liquid leakage path, serve sealing function.Both elastic sealed body had been made (3) losing efficacy, O (2) is under the effect of external pressure, and the contact force relying on elastic deformation to produce also can prevent leakage.Sealing ring is prevented Stop dielectric leakage or prevent impurity from invading motor cavity from outside.O-ring seals (2) belongs to contact seal self-sealing and compresses close Envelope.

The technique effect of invention: 1) pressure of the most salable both direction of individual pen, seal reliable.2) O-ring seals 2 volume Little, lightweight, low cost.3) seal member simple in construction, is convenient to mount and dismount, and need not periodically adjust.The rough surface of unthreaded hole (7) Degree 0.8 is because O-ring seals (2) is to the highest by sealing member roughness requirements, and the purpose improving surface roughness is that minimizing rubs Wipe resistance, extend the service life of sealing ring；Normal to whole motor of the quality of O-ring seals (2) and elastic sealed body (3) Work, service life all have a significant impact, and use the nitrile rubber of high rigidity to improve sealability for this.The present invention is sealed into Two seals combines: elastic sealed body seals and relies on the tightening of nut, and compresses pressure ring, makes same at axial shortening of elastic sealed body Time produce expanded radially, thus combine closely with housing (6) and holding wire (1), produce and compress sealing function, this structure meets prevents Quick-fried requirement, can play flame proof effect very well, meets motor requirement of explosion proof, and elastic sealed body (3) contacts with O-ring seals (2) Face is inclined-plane, when it compresses O-ring seals (2), and O-ring seals (2) under the effect of the pressure, is pressed against the both sides that groove is vertical, It deforms increase, increases with the contact surface of groove both sides, plugs liquid leakage path, serve sealing function；O-ring seals (2) volume is little, lightweight, low cost, seal member simple in construction, is convenient to mount and dismount, and need not periodically adjust, under pressure Producing elastic deformation, it is possible to seal groove both direction, both made elastic sealed body (3) lose efficacy, O-ring seals (2) is at the work of external pressure Under with, the contact force relying on elastic deformation to produce also can prevent leakage.Two seals combination well solves water inside and outside unthreaded hole Sealing and external seal in holding wire (1) place, seal reliable, motor, through verification experimental verification, does not leak.

Accompanying drawing illustrates:

Fig. 1 holding wire seals structure

Detailed description of the invention:

It is made up of as it is shown in figure 1, seal structure two seals, respectively O-ring seals (2) and elastic sealed body (3), O Shape sealing ring (2) and elastic sealed body (3) are placed in unthreaded hole (7), and elastic sealed body (3) and O-ring seals (2) contact surface are oblique Face, elastic sealed body (3) top installs pressure ring (4), clamp nut (5) successively.The roughness of unthreaded hole (7) is 0.8, encapsulant Use the nitrile rubber of high rigidity.The present invention is sealed into two seals combination: elastic sealed body (3) seals and relies on nut (5) Tighten compression pressure ring, make elastic sealed body (3) produce expanded radially while axial shortening, thus with housing (6) and signal Line (1) is combined closely, and produces and compresses sealing function.This structure meets requirement of explosion proof, can well play flame proof effect, meets electricity Machine requirement of explosion proof.Elastic sealed body (3) by compression time also can compress O-ring seals (2), O-ring seals (2) compressive deformation, produce Raw elastic contact force realizes sealing, and the sealability of O-ring seals typically raises with the rising of pressure, elastic sealed body (3) contact surface with O-ring seals (2) is inclined-plane, and when it compresses O-ring seals (2), O-ring seals (2) is at the work of pressure Under with, both direction all can be deformed in length and breadth, and its deformation is big, also increases with the contact surface of groove both sides, plugs liquid leakage Passage, serves sealing function.Both having made elastic sealed body (3) lose efficacy, O-ring seals (2), under the effect of external pressure, relies on elasticity The contact force that deformation produces also can prevent leakage.Sealing ring prevents dielectric leakage or prevents impurity from invading motor cavity from outside. Normal work, the service life of whole motor are all had a significant impact by the quality of sealing member.O-ring seals seals and belongs to contact Seal self-sealing and compress sealing.O-ring seals is to the highest by sealing member roughness requirements, and the purpose improving surface roughness is Reducing friction resistance, extends the service life of sealing ring, and the roughness requirements of unthreaded hole is 0.8；Encapsulant uses high rigidity Nitrile rubber is to improve the sealability of sealing member.This sealing structural advantages 1) pressure of the most salable both direction of individual pen, close Envelope is reliable, 2) O-ring seals volume is little, lightweight, low cost 3) seal member simple in construction, it is convenient to mount and dismount, need not be periodically Adjust.Producing elastic deformation under pressure, the contact force relying on elastic deformation to produce seals, and two seals combines very Good solve inside and outside unthreaded hole external seal at water-stop and holding wire 1, safe and reliable.Motor, through verification experimental verification, is not let out Leakage.

The present invention is sealing signal line, the inside and outside water of motor cavity, seals structure simultaneously and still suffers from 10Mpa external pressure, Er Qieman Foot flame proof requires that devising this seals structure, is screwed into compression elastic sealed body (3) with nut (5), makes elastic sealed body (3) exist Expanded radially while axial shortening, thus combine closely with unthreaded hole (7) and holding wire (1), for improving sealability and elasticity Seal (3) uniform force, adds pressure ring (4) between elastic sealed body (3) and clamp nut (5), improves elastic sealed body Hardness improve the bearing capacity of elastic sealed body, also meet requirement of explosion proof simultaneously；Add O RunddichtringO (2), O type Sealing ring is that self-sealing compresses sealing, improves the reliability of sealing, simultaneously by the contact surface design of elastic sealed body with O Sealing for inclined-plane compression O-ring seals, two seals makes sealing reliable, reaches to use requirement.

Claims (2)

1. bear a combination sealing signal line structure for external pressure, it is characterized in that: seal structure and be made up of two seals, be respectively O-ring seals (2) and elastic sealed body (3), O-ring seals (2) and elastic sealed body (3) are placed in the unthreaded hole (7) of housing (6) In, elastic sealed body (3) and O-ring seals (2) contact surface are inclined-plane, elastic sealed body (3) top install successively pressure ring (4), Clamp nut (5).

A kind of combination sealing signal line structure bearing external pressure the most according to claim 1, is characterized in that: unthreaded hole (7) Roughness is 0.8, and encapsulant uses the nitrile rubber of high rigidity.