A kind of stuffing box and comprise the ground connection case of sealing case
Technical field
The utility model relates to a kind of stuffing box, relates in particular to the stuffing box that a kind of sealing property is good, water resistance is good and comprises the ground connection case of sealing case.
Background technology
In the single-core power cables circuit of 110kV/220kV electric pressure, when lightning wave or internal overvoltage when cable core flows, higher impulse overvoltage can appear in the earth-free end of cable metal sheath, overvoltage may puncture the protective coverings of cable insulation, cause cable metal sheath multipoint earthing fault, have a strong impact on the normal operation of power cable even significantly reduce cable useful life.
For avoiding the generation of above-mentioned phenomenon, the general ground connection case that adopts limits sheath and the superpotential rising in insulating joint both sides, the induced voltage of restriction metallic sheath, reduce, eliminate the ring current on the sheath, improve the transmission capacity of cable, prevent that protective coverings of cable is breakdown, guarantee that cable security moves reliably.
At present, the ground connection case generally have intersect ground connection case, ground protection case with direct ground connection case, these three kinds of ground connection casees all have casing, lid and pad sealing strip or the sealing gasket between casing and lid.
Yet, the poor sealing of above-mentioned ground connection case, and the ground connection case is embedded in that underground meeting is made moist because of sealing property is bad, intaking causes multipoint earthing, causes cable metal sheath induced current excessive, loses the due defencive function of ground connection case.
The utility model content
The purpose of this utility model is the ground connection case that the stuffing box that a kind of sealing property is good, water resistance is good is provided and comprises the sealing case.
For realizing above-mentioned main purpose, the utility model provides a kind of stuffing box, comprise casing and lid, casing is hollow form and has an opening, lid is fixed on this above opening, the wall that described casing is positioned at described opening part be provided with one along described split ring around accepting groove, described stuffing box has a sealing strip, sealing strip is contained in accepting groove.
Described casing is positioned at and has protruded out two sealing frames on the wall of opening part, and the wall that this two sealing frame and described casing are positioned at opening part forms described accepting groove.
Described casing has the turning on the wall of opening part, described sealing frame part around the corner is an arc, and described accepting groove part around the corner is a deep-slotted chip breaker.
The wall outer edge that described casing is positioned at opening part has protruded out carriage, or the outer edge of described lid and the contacted wall of described casing has protruded out carriage.
The wall that described casing contacts with lid all offers some corresponding fixing holes, is provided with packing ring between the two corresponding fixing holes, and passes two corresponding fixing holes and fixing described casing of packing ring and lid by screw.
Casing is positioned at the carriage of wall outer edge of opening part and the wall of lid connects, or between two corresponding fixing holes, be added with packing ring, casing and lid are supported by carriage or packing ring, with static housings such as screw and lid the time, casing or the lid that can avoid causing because of the sealing frame that protrudes out are out of shape, and then guarantee written or printed documents stuffing box sealing property.
For realizing above-mentioned another purpose, the utility model provides a kind of ground connection case, and this ground connection case comprises described stuffing box, is provided with insulating barrier in the casing of described stuffing box, is fixed with copper bar on this insulating barrier, and the casing of described stuffing box is provided with the inlet wire pipe.
For realizing above-mentioned another purpose; the utility model provides another kind of ground connection case; this ground connection case comprises described stuffing box; be provided with insulating barrier in the casing of described stuffing box; be fixed with copper bar and copper billet on this insulating barrier, this copper bar one end is connected with this copper billet, and this copper bar other end is connected with some cable protective layer protectors; these cable protective layer protectors are connected with a grounding parts, and the casing of described stuffing box is provided with the inlet wire pipe.
For realizing above-mentioned another purpose; the utility model provides a kind of ground connection case again; this ground connection case comprises described stuffing box; be provided with insulating barrier in the casing of described stuffing box, be fixed with copper bar and copper billet on this insulating barrier, this copper bar one end is connected with this copper billet; this copper bar other end is connected with some cable protective layer protectors; these cable protective layer protectors are connected with a grounding parts, and the insulating barrier of these cable protective layer protectors adopts silicon rubber insulation, and the casing of described stuffing box is provided with the inlet wire pipe.
The generation type of accepting groove also can concave at the wall that described casing is positioned at opening part and form described accepting groove.
As mentioned above, the utility model stuffing box comprises casing, lid and sealing strip, lid is fixed on above the opening of casing, because sealing strip is contained in the accepting groove of casing, can make sealing strip be in excellent sealing by the accepting groove and the casing of casing, make sealing strip and lid be in excellent sealing, and then make that this stuffing box sealing property is good, water resistance good.The ground connection case has the advantage that sealing property is good, water resistance is good that this stuffing box has because of comprising this stuffing box, reduces, eliminates the ring current on the cable sheath, prevents that cable sheath is breakdown, guarantees that cable security moves reliably.
Description of drawings
Fig. 1 is the utility model stuffing box and the three-dimensional exploded view that comprises ground connection case first embodiment of sealing case;
Fig. 2 is the utility model stuffing box and the three-dimensional exploded view that comprises ground connection case second embodiment of sealing case;
Fig. 3 is the utility model stuffing box and the three-dimensional exploded view that comprises ground connection case the 3rd embodiment of sealing case.
Each description of reference numerals is as follows among the figure:
Casing 10 openings 11
Accepting groove 12 deep-slotted chip breakers 121
Sealing frame 13 turnings 14
Carriage 15 fixing holes 16
Lid 20 packing rings 21
Sealing strip 30 ground connection case 100/100 '/100 "
Insulating barrier 40 copper bars 50
Inlet wire pipe 60 copper billets 70
Cable protective layer protector 80 grounding parts 90
Embodiment
By describing technology contents of the present utility model, structural feature in detail, realized purpose and effect, give explanation below in conjunction with execution mode and conjunction with figs. are detailed.
See also Fig. 1, first embodiment that it has disclosed the utility model stuffing box and has comprised the ground connection case 100 of sealing case, stuffing box comprise casing 10, lid 20 and sealing strip 30.
It is rectangular-shaped that casing 10 is hollow, has an opening that makes progress 11, the wall that casing 10 is positioned at opening 11 places be provided with one along opening 11 around accepting groove 12, in the present embodiment, casing 10 is positioned at and has protruded out two sealing frames, 13, two sealing frames 13 on the wall at opening 11 places and form described accepting groove 12 with the wall that casing 10 is positioned at opening 11 places.Certainly, the generation type of accepting groove 12 also has other modes, and for example casing 10 wall that is positioned at opening 11 places can concave and form described accepting groove.Casing 10 has turning 14 on the wall at opening 11 places, sealing frame 13 part around the corner is an arc, and 14 place's parts are deep-slotted chip breaker 121 to accepting groove 12 at the turning.It is poorly sealed at 14 places, turning of casing 10 that this kind design can be avoided, and guarantees the excellent sealing of this stuffing box.
The wall outer edge that casing 10 is positioned at opening 11 places has protruded out carriage 15.Certainly, also can be that the outer edge of lid 20 and casing 10 contacted walls has protruded out the carriage (not shown), the height of this carriage 15 is preferably consistent with the height of two sealing frames 13.
See also Fig. 2, Fig. 2 disclosed the utility model stuffing box and comprise the ground connection case 100 of sealing case ' second embodiment, second embodiment and first embodiment are similar, its difference is: the wall that casing 10 contacts with lid 20 all offers some corresponding fixing holes 16, be provided with packing ring 21 between the two corresponding fixing holes 16, thereby save the carriage 15 among first embodiment, and pass two corresponding fixing holes 16 and packing ring 21 static housings 10 and lid 20 by screw.
The utility model stuffing box is when assembling, lid 20 is fixed on above the opening 11 of casing 10, sealing strip 30 is contained in the accepting groove 12 of casing 10, can make the accepting groove 12 and casing 10 excellent sealings of sealing strip 30, and then make that this stuffing box sealing property is good, water resistance good by casing 10.The wall of carriage 15 and lid 20 that casing 10 is positioned at the wall outer edge at opening 11 places connects, or between two corresponding fixing holes 16, be added with packing ring 21, casing 10 and lid 20 are supported by carriage 15 or packing ring 21, with static housings such as screw 10 and lid 20 time, casing 10 or the lid 20 that can avoid causing because of the sealing frame 13 that protrudes out are out of shape, and then guarantee written or printed documents stuffing box sealing property.
Ground connection case 100 comprises ground connection case 100, is provided with insulating barrier 40 in the casing 10 of stuffing box, is fixed with copper bar 50 on the insulating barrier 40, and the casing 10 of stuffing box is provided with inlet wire pipe 60.
See also Fig. 3; Fig. 3 has disclosed the utility model stuffing box and has comprised the ground connection case 100 of sealing case " the 3rd embodiment; the 3rd embodiment and first embodiment are similar; its difference is: be fixed with copper bar 50 and copper billet 70 on the insulating barrier 40; copper bar 50 1 ends are connected with copper billet 70; copper bar 50 other ends are connected with some cable protective layer protectors 80, and these cable protective layer protectors 80 are connected with a grounding parts 90, the insulating barrier employing silicon rubber insulation of these cable protective layer protectors 80.
Ground connection case 100/100 '/100 " have the advantage that sealing property is good, water resistance is good that this stuffing box has because of comprising this stuffing box; avoid making moist because of sealing property is bad, intaking causes multipoint earthing, causes the excessive phenomenon of cable metal sheath induced current; reduce, eliminate the ring current on the cable sheath; prevent that cable sheath is breakdown, guarantee that cable security moves reliably.
In sum, this stuffing box comprises casing 10, lid 20 and sealing strip 30, lid 20 is fixed on above the opening 11 of casing 10, sealing strip 30 is contained in the accepting groove 12 of casing 10, can make the accepting groove 12 and casing 10 excellent sealings of sealing strip 30 by casing 10, make sealing strip 30 and lid 20 be in excellent sealing, and then make that this stuffing box sealing property is good, water resistance good.
The utility model is not limited to above-mentioned embodiment, and those skilled in the art that also can make multiple variation in view of the above, but any and the utility model are equal to or similar variation all should be encompassed in the scope of the utility model claim.