CN1267938C - Method for producing high-tension insulating bushing - Google Patents

Abstract

The present invention relates to a method for manufacture of column-shaped high-voltage bushing insulators, the bushing insulator has symmetrical hollow cylindrical external insulator with lead-through head supported by one of its butt-ends and designed for connection to high-voltage supply, resting on opposite end of insulator is lead-through base designed for connection to ground potential. The method involves sequential fitting of lead-through base, external insulator, and lead-through head on drawing frame; lead-through base rests in this case on insulating case. Lead-through base and lead-through head are tightly fitted to one another through drawing frame that mounts insulating case. A clamping member made for shifting in axial direction is installed on flange of lead-through head prior to fitting the latter on drawing frame; head flange and clamping member are pressed against one another to produce pre-tensioning force. During next fitting of pre-tensioned lead-through head clamping member is secured on end of drawing frame passed through insulator, and then clamping member is taken off head flange in condition of forming tension.

Description

Be used to make the method for high-tension insulating bushing

Technical field

The present invention relates to a kind of method that is used to make high-tension insulating bushing of the preamble by claim 1.With this method manufacturing structure sleeve pipe that is cylindricality, this sleeve pipe be used to make a conductor dbus that is loaded with high pressure cross a ground connection, the shell wall of a transformer for example.Such sleeve pipe has the cylindrosymmetric outdoor insulator of a hollow respectively, at casing head that can pass to high-voltage of an end face upper support of this outdoor insulator, can pass to earthy set of pins in one of the mutually opposed distolateral support of insulator.This sleeve pipe comprises a drawing pipe and a field control insulator that is installed on this drawing pipe that passes outdoor insulator along cylinder axis in addition.In the method, set of pins, outdoor insulator and casing head are pushed onto on the drawing body in order, and set of pins is supported on the insulator, and casing head and set of pins are strained each other via the drawing body.

Background technology

The present invention relates to method, as being used for many years method by patent application person according to the manufacturing high-tension insulating bushing of described type.Wherein, outdoor insulator of being made by the plastics of pottery or dimensionally stable for the set of pins of mounting flange form, and one have the casing head that compresses spring and are placed in order on the drawing pipe.This drawing pipe supports a field control insulator, in this insulator upper support set of pins.Keep being supported on casing head on this outdoor insulator by tightener with pretightning force.Nut be screwed in this drawing pipe pass through this casing head and have on the externally threaded end, directly be screwed to the stopper section of casing head.After this tightener unclamps, casing head and set of pins by this drawing pipe and insulator each other power be connected, and utilize a pretightning force that limits by the compression spring to be supported on outdoor insulator distolateral, thereby cavity and external isolation and the filling of available dielectric that is positioned at outdoor insulator inside.

Summary of the invention

Task of the present invention is, provides a kind of literary composition first described class method for distinguishing, and this method can have the high-tension insulating bushing of different size with economic especially mode manufacturing.

By in the method for the present invention, before casing head being set on the drawing body, comprise that with one a tension element clamping plate and a spring, that can move vertically is tightly on a flange of casing head; This upper flange and tension element are tightened up under the situation that forms pretightning force each other; When being set to the casing head of pretension on the drawing body subsequently, tension element is fixed on the end that passes through insulator of drawing body and tension element unclamps from upper flange under the situation that forms pretightning force subsequently.These method steps can be fast and are made high-tension insulating bushing economically.The structure size that is comparatively complicated, that depend on sleeve pipe and the casing head of task can be prepared, also tightener can be added.

For the manufacturing technology reason, it is favourable by a screw that passes in the tapped through hole of this flange plate this tension element being installed on the upper flange.In the installation of sleeve pipe, this tension element then can be operated very simply then.This tension element is also largely irrelevant and can be used for making the sleeve pipe of virtually any size with the size of casing head.

By rotary screw, a clamping plate that of tension element is abutted on the spring of this tension element guides towards upper flange.Can produce in simple and reliable mode by a screwdriver so required pretightning force is installed.

Suggestion is screwed in the casing head of pretension on the external screw thread of drawing body with an internal thread that is located on the clamping plate, and is spun on the drawing body stopper section up to outdoor insulator.Therefore can be on the one hand make required and therefore already present external screw thread, do not need instrument to process the sleeve pipe of prepackage again with tradition.

Sleeve pipe just can a kind of very simple mode be finished final assembling now.Turn on screw with a screwdriver, like this, upper flange and set of pins automatically are fixed on the outdoor insulator via spring, clamping plate, drawing body and a field control insulator that is fixed on the drawing body of pretension.

Because the matching thread of screw is a through-hole structure, so after removing screw, available dielectric is filled the inside of sleeve pipe by this through hole.Therefore do not need to be provided with an additional filling opening that is used for this dielectric.

After filling dielectric,, then can realize the positiver sealing of inside pipe casing if tapped through hole seals by a suitable sealing screw.

Description of drawings

The present invention will be described by embodiment below.Accompanying drawing is depicted as:

Fig. 1 is the end view of the high-tension insulating bushing made by the inventive method, and the right side of its longitudinal axis shown in section and

Fig. 2 is a vertical view, show pretension before the high-tension insulating bushing that is installed in by Fig. 1 casing head.

Embodiment

Identical label represents to have the part of same function in two views.High-tension insulating bushing shown in Figure 1 is cylindricality, and has a hollow, cylindrosymmetric outdoor insulator 1.With material a kind of dimensionally stable, weather proof corrosion, make by particularly a kind of plastics on a pipe of being made by a kind of fibre-reinforced composite material and a kind of silicones shielding part or ceramic screened 's basis for this insulator.This insulator can pass to the metallic sheath tube head 2 of high-voltage in its end face upper support one up.This outdoor insulator its down, promptly opposite with above-mentioned end face end face upper support one can pass to earthy metallic sheath pin 3.

Vertical orientated axis 4 along outdoor insulator 1 passes a cylindrosymmetric metal drawing body 5, and as shown in the figure, its structure can be pipe 5 or is solid bolt.Under the situation of its structure for pipe 5, this drawing body is used to hold the cut cable that is loaded with high pressure, and this cut cable is fixed on the upper end of this drawing pipe conductively with a cable bolt.If the structure of this drawing body is a bolt, then this bolt guiding is toward the mobile electric current of cut cable of being everlasting.

Obviously as seen, on the outer surface of drawing pipe 5, be fixed with one and preferably control insulator 6 as the field of capacitor casing structure.This insulator 6 has a structure and is mainly columniform epimere portion and a hypomere portion that is mainly taper.This cylindrical segment portion is arranged on the inside of outdoor insulator 1, and is used to control being loaded with high pressure and passing the electric field of the electric conductor of drawing pipe 5 in the scope of insulator 1 and set of pins 3 out of doors when using this sleeve pipe.When using this sleeve pipe, conical section portion is arranged in for example a transformer and the housing that set of pins 3 conductions are connected, and controls the electric field of unshowned in Fig. 1, the electric conductor that is loaded with high pressure of this enclosure interior.A control insulator 6 comprises a shaft shoulder 7 between above-mentioned two sections portions, is supported with set of pins 3 thereon.The two ends of drawing pipe 5 pass the inside of this sleeve pipe.Be provided with external screw thread 51 in the upper end of drawing pipe 5, itself and unshowned two internal threads synergy in Fig. 1, thereby with the tension element 21 of casing head 2 with an erecting device 8 is remained on the terminal bolt of this electric conductor of extracting, being loaded with high pressure when using this sleeve pipe from drawing pipe 5 out.Be fixed with the control electrode of a sphere in the lower end of drawing pipe 5, this electrode is used for making the electric field homogenizing of the electric conductor that drawing pipe 5 extracts out.

In order to make this sleeve pipe, in order set of pins 3 and outdoor insulator 1 are placed on this drawing pipe.Set of pins 3 just supports on the shaft shoulder 7 of control insulator 6 on the scene and on the lower surface of outdoor insulator 1 then.Subsequently casing head 2 is placed on the drawing pipe 5.When being nested with, so tension element 21 is fixed on the flange 22 of casing head 2, making between tension element 21 and the flange 22 has the pretightning force of a qualification to work.

Figure 2 illustrates the structure of the casing head 2 of pretension.Obviously as seen, in the upper flange 22 of casing head 2, be provided with two tapped through holes, wherein each is screwed with each screw 23 respectively, and tension element 21 has a disc spring 24 and a clamping plate 25 that compresses this disc spring 24 that abuts on the upper flange.This clamping plate 25 comprise two unshowned, along the bearing shell of the direction of axis 4 orientation, all be supported with one of rotatable two mounting screws 23 in therein each.In addition, in clamping plate 25, also be provided with internal thread 26.

Before being set to casing head 2 on the drawing pipe 5, above-mentioned two rigging screws are screwed in the upper flange 22.Simultaneously clamping plate 25 is guided and compresses the disc spring 24 that abuts on the upper flange 22 downwards.

All can reach same effect with a unique mounting screw or more than two mounting screw.Important part is that clamping plate can move along the direction of axis 4.If a screw 23 only is set, then the pretightning force of an one-sided effect can be compensated by a directing pin, and this directing pin is used for substituting second mounting screw 23.

At this moment casing head 2 with the power pretension like this of a qualification is placed on the drawing pipe 5 equally.Simultaneously, the internal thread 26 of clamping plate 25 is screwed on the external screw thread 51 of drawing pipe 5, and is spun on the drawing pipe 5 stopper section until outdoor insulator 1.When unclamping this and be threaded, the disc spring 24 of pretension is backed out and clamping plate 25 is upwards lifted along axis direction.In above-mentioned motion, the drawing pipe 5 that is connected securely by screw thread 26,51 and clamping plate 5 with upwards lifted with a field control insulator 6 that this drawing pipe firmly is connected.The upper flange 22 of casing head 2 and set of pins 3 are fixed on the end face of outdoor insulator 1 mutually in tension via disc spring 24, clamping plate 25, drawing pipe 5 and insulator 6 thus.

One be retained in this inside pipe casing, substantially by the cavity that inwall defined 9 of insulator 6 and outdoor insulator 1, upper flange and set of pins 3 for a kind of dielectric of dielectric reason, for example a kind of silicon insulating oil filling.After above-mentioned two mounting screws 23 were removed fully, this dielectric just can be packed into by one of tapped through hole by a kind of simple mode.Unshowned in Fig. 2, the sealing ring between drawing pipe 5 and the upper flange 22 and not shown in this Figure, the sealing ring between insulator 1 or insulator 6 and upper flange 22 or the set of pins 3 is used for sealed cavity 9 out of doors.The air that is present in the cavity 9 thus can be by another discharge in above-mentioned two tapped through holes.After cavity filling 9, tapped through hole can seal with sealing screw.

Reference numerals list

1 outdoor insulator

2 casing heads

3 set of pins

4 axis

5 drawing bodies, the drawing pipe

6 insulators

7 shaft shoulders

8 erecting devices

9 cavitys

21 tension elements

22 upper flanges

23 mounting screws

24 disc springs

25 clamping plates

26 internal threads

51 external screw threads

Claims (7)

1. be used to make the method that a kind of structure is the high-tension insulating bushing of cylindricality, this high-tension insulating bushing has the cylindrosymmetric outdoor insulator (1) of a hollow, on end face that is supported on this outdoor insulator and can pass to the casing head (2) of high-voltage, one be supported on insulator (1) mutually opposed distolateral and can pass to earthy set of pins (3), one is passed outdoor insulator (1) and drawing body (5) that can pass to high-voltage and has a field control insulator (6) that is fixed on this drawing body along cylinder axis (4), in the method, set of pins (3), outdoor insulator (1) and casing head (2) are pushed onto on the drawing body (5) in order, set of pins (3) is supported on the insulator (6), casing head (2) and set of pins (3) are strained each other via drawing body (5), it is characterized in that:

Before casing head (2) being set on the drawing body (5), comprise that with one a clamping plate (25) and a tension element spring (24) and that can move vertically (21) are tightly on the upper flange (22) of casing head (2); Upper flange (22) and tension element (21) are strained under the situation that forms pretightning force each other; Subsequently the casing head (2) of pretension is being set to drawing body (5) when going up, tension element (21) is fixed on the end that passes insulator (1) of drawing body (5); Tension element (21) unclamps from upper flange (22) under the situation that forms tension then.

2. by the described method of claim 1, it is characterized in that: tension element (21) by a screw (23) that in a tapped through hole of upper flange (22), passes tightly on upper flange (22).

3. by the described method of claim 2, it is characterized in that: the clamping plate (25) that will abut at the same time on the spring (24) constitutes pretightning force by rotary screw (23) under the situation of upper flange (22) guiding.

4. by the described method of claim 3, it is characterized in that: the casing head of pretension (2) is screwed on the external screw thread (51) of drawing body (5) with an internal thread (26) that is located on the clamping plate (25), and be screwed on the drawing body (5), until backstop out of doors on the insulator (1).

5. by the described method of claim 4, it is characterized in that: upper flange (22) and set of pins (3) are fixed on the outdoor insulator (1) via spring (24), clamping plate (25), drawing body (5) and insulator (6) each other in tension by unclamping screw (23).

6. by the described method of claim 5, it is characterized in that: remove screw (23), the inside of this sleeve pipe just can be filled with dielectric via tapped through hole.

7. by the described method of claim 6, it is characterized in that: this tapped through hole seals by a sealing screw after filling dielectric.

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